| blob | 9a9f859974a0c6bfcd478b370ad106778df8e2d4 |
1 /* -*- C++ -*- Parser.
2 Copyright (C) 2000-2022 Free Software Foundation, Inc.
3 Written by Mark Mitchell <mark@codesourcery.com>.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it
8 under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
10 any later version.
12 GCC is distributed in the hope that it will be useful, but
13 WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
22 #define INCLUDE_MEMORY
50 \f
51 /* The lexer. */
53 /* The cp_lexer_* routines mediate between the lexer proper (in libcpp
54 and c-lex.cc) and the C++ parser. */
56 /* The various kinds of non integral constant we encounter. */
58 NIC_NONE,
59 /* floating-point literal */
60 NIC_FLOAT,
61 /* %<this%> */
62 NIC_THIS,
63 /* %<__FUNCTION__%> */
64 NIC_FUNC_NAME,
65 /* %<__PRETTY_FUNCTION__%> */
66 NIC_PRETTY_FUNC,
67 /* %<__func__%> */
68 NIC_C99_FUNC,
69 /* "%<va_arg%> */
70 NIC_VA_ARG,
71 /* a cast */
72 NIC_CAST,
73 /* %<typeid%> operator */
74 NIC_TYPEID,
75 /* non-constant compound literals */
76 NIC_NCC,
77 /* a function call */
78 NIC_FUNC_CALL,
79 /* an increment */
80 NIC_INC,
81 /* an decrement */
82 NIC_DEC,
83 /* an array reference */
84 NIC_ARRAY_REF,
85 /* %<->%> */
86 NIC_ARROW,
87 /* %<.%> */
88 NIC_POINT,
89 /* the address of a label */
90 NIC_ADDR_LABEL,
91 /* %<*%> */
92 NIC_STAR,
93 /* %<&%> */
94 NIC_ADDR,
95 /* %<++%> */
96 NIC_PREINCREMENT,
97 /* %<--%> */
98 NIC_PREDECREMENT,
99 /* %<new%> */
100 NIC_NEW,
101 /* %<delete%> */
102 NIC_DEL,
103 /* calls to overloaded operators */
104 NIC_OVERLOADED,
105 /* an assignment */
106 NIC_ASSIGNMENT,
107 /* a comma operator */
108 NIC_COMMA,
109 /* a call to a constructor */
110 NIC_CONSTRUCTOR,
111 /* a transaction expression */
112 NIC_TRANSACTION
113 };
115 /* The various kinds of errors about name-lookup failing. */
117 /* NULL */
118 NLE_NULL,
119 /* is not a type */
120 NLE_TYPE,
121 /* is not a class or namespace */
122 NLE_CXX98,
123 /* is not a class, namespace, or enumeration */
124 NLE_NOT_CXX98
125 };
127 /* The various kinds of required token */
129 RT_NONE,
151 /* The type is CPP_KEYWORD */
183 RT_CO_YIELD /* co_yield */
184 };
186 /* RAII wrapper for parser->in_type_id_in_expr_p, setting it on creation and
187 reverting it on destruction. */
189 class type_id_in_expr_sentinel
190 {
200 };
202 /* Prototypes. */
208 static void cp_lexer_destroy
210 static int cp_lexer_saving_tokens
214 static void cp_lexer_get_preprocessor_token
222 static bool cp_lexer_next_token_is_not
224 static bool cp_lexer_next_token_is_keyword
228 static void cp_lexer_purge_token
230 static void cp_lexer_purge_tokens_after
232 static void cp_lexer_save_tokens
234 static void cp_lexer_commit_tokens
236 static void cp_lexer_rollback_tokens
238 static void cp_lexer_print_token
242 static void cp_lexer_start_debugging
244 static void cp_lexer_stop_debugging
249 static tree cp_parser_late_noexcept_specifier
251 static void noexcept_override_late_checks
254 static void cp_parser_initial_pragma
257 static bool cp_parser_omp_declare_reduction_exprs
259 static void cp_finalize_oacc_routine
262 /* Manifest constants. */
263 #define CP_LEXER_BUFFER_SIZE ((256 * 1024) / sizeof (cp_token))
264 #define CP_SAVED_TOKEN_STACK 5
266 /* Variables. */
268 /* The stream to which debugging output should be written. */
271 /* Nonzero if we are parsing an unevaluated operand: an operand to
272 sizeof, typeof, or alignof. */
275 /* Dump up to NUM tokens in BUFFER to FILE starting with token
276 START_TOKEN. If START_TOKEN is NULL, the dump starts with the
277 first token in BUFFER. If NUM is 0, dump all the tokens. If
278 CURR_TOKEN is set and it is one of the tokens in BUFFER, it will be
279 highlighted by surrounding it in [[ ]]. */
281 static void
285 {
302 {
305 }
310 {
317 nprinted++;
327 {
337 }
338 }
341 {
344 }
347 }
350 /* Dump all tokens in BUFFER to stderr. */
352 void
354 {
356 }
358 DEBUG_FUNCTION void
360 {
362 }
364 DEBUG_FUNCTION void
366 {
369 else
371 }
374 /* Dump the cp_parser tree field T to FILE if T is non-NULL. DESC is the
375 description for T. */
377 static void
379 {
381 {
384 }
385 }
388 /* Dump parser context C to FILE. */
390 static void
392 {
397 }
400 /* Print the stack of parsing contexts to FILE starting with FIRST. */
402 static void
404 {
410 {
413 }
414 }
417 /* Print the value of FLAG to FILE. DESC is a string describing the flag. */
419 static void
421 {
424 }
427 /* Print an unparsed function entry UF to FILE. */
429 static void
431 {
434 tree fn;
439 i++)
440 {
446 }
451 {
454 }
460 {
463 }
465 }
468 /* Print the stack of unparsed member functions S to FILE. */
470 static void
473 {
479 {
482 }
483 }
486 /* Dump the tokens in a window of size WINDOW_SIZE around the next_token for
487 the given PARSER. If FILE is NULL, the output is printed on stderr. */
489 static void
491 {
503 next_token);
504 }
507 /* Dump debugging information for the given PARSER. If FILE is NULL,
508 the output is printed on stderr. */
510 void
512 {
515 expanded_location eloc;
580 parser->type_definition_forbidden_message_arg
596 }
598 DEBUG_FUNCTION void
600 {
602 }
604 DEBUG_FUNCTION void
606 {
609 else
611 }
613 /* Allocate memory for a new lexer object and return it. */
617 {
618 /* Allocate the memory. */
621 /* Initially we are not debugging. */
626 /* Create the buffer. */
630 }
632 /* Create a new main C++ lexer, the lexer that gets tokens from the
633 preprocessor. */
637 {
638 cp_token token;
640 /* It's possible that parsing the first pragma will load a PCH file,
641 which is a GC collection point. So we have to do that before
642 allocating any memory. */
648 /* Put the first token in the buffer. */
655 /* Get the remaining tokens from the preprocessor. */
657 {
659 /* Process the previous token. */
664 }
672 {
673 /* Set the EOF token's location to be the just after the previous
674 token's range. That way 'at-eof' diagnostics point at something
675 meaninful. */
679 }
684 /* Subsequent preprocessor diagnostics should use compiler
685 diagnostic functions to get the compiler source location. */
692 }
694 /* Create a new lexer whose token stream is primed with the tokens in
695 CACHE. When these tokens are exhausted, no new tokens will be read. */
699 {
704 /* We do not own the buffer. */
707 /* Insert an EOF token. */
718 /* Initially we are not debugging. */
724 }
726 /* Frees all resources associated with LEXER. */
728 static void
730 {
733 else
734 {
735 /* Restore the token we overwrite with EOF. */
738 }
741 }
743 /* This needs to be set to TRUE before the lexer-debugging infrastructure can
744 be used. The point of this flag is to help the compiler to fold away calls
745 to cp_lexer_debugging_p within this source file at compile time, when the
746 lexer is not being debugged. */
748 #define LEXER_DEBUGGING_ENABLED_P false
750 /* Returns nonzero if debugging information should be output. */
754 {
759 }
764 {
766 }
770 {
772 }
776 {
778 }
782 {
784 }
788 {
791 /* Skip past purged tokens. */
793 {
795 tp--;
796 }
799 }
801 /* Same as above, but return NULL when the lexer doesn't own the token
802 buffer or if the next_token is at the start of the token
803 vector or if all previous tokens are purged. */
807 {
810 {
813 /* Skip past purged tokens. */
815 {
818 tp--;
819 }
821 }
824 }
826 /* Overload for make_location, taking the lexer to mean the location of the
827 previous token. */
831 {
834 }
836 /* Overload for make_location taking tokens instead of locations. */
840 {
842 }
844 /* nonzero if we are presently saving tokens. */
848 {
850 }
852 /* Store the next token from the preprocessor in *TOKEN. Return true
853 if we reach EOF. If LEXER is NULL, assume we are handling an
854 initial #pragma pch_preprocess, and thus want the lexer to return
855 processed strings. */
857 static void
859 {
862 /* Get a new token from the preprocessor. */
863 token->type
865 flags);
870 /* Usually never see a zero, but just in case ... */
873 /* On some systems, some header files are surrounded by an
874 implicit extern "C" block. Set a flag in the token if it
875 comes from such a header. */
880 /* Check to see if this token is a keyword. */
882 {
884 {
885 /* Mark this token as a keyword. */
887 /* Record which keyword. */
889 }
890 else
891 {
895 {
896 /* Warn about the C++0x keyword (but still treat it as
897 an identifier). */
902 /* Clear out the C_RID_CODE so we don't warn about this
903 particular identifier-turned-keyword again. */
905 }
909 {
910 /* Warn about the C++20 keyword (but still treat it as
911 an identifier). */
916 /* Clear out the C_RID_CODE so we don't warn about this
917 particular identifier-turned-keyword again. */
919 }
922 }
923 }
925 {
926 /* This only happens in Objective-C++; it must be a keyword. */
929 {
930 /* Replace 'class' with '@class', 'private' with '@private',
931 etc. This prevents confusion with the C++ keyword
932 'class', and makes the tokens consistent with other
933 Objective-C 'AT' keywords. For example '@class' is
934 reported as RID_AT_CLASS which is consistent with
935 '@synchronized', which is reported as
936 RID_AT_SYNCHRONIZED.
937 */
947 }
948 }
949 }
951 /* Update the globals input_location and the input file stack from TOKEN. */
954 {
956 }
958 /* Update the globals input_location and the input file stack from LEXER. */
961 {
964 }
966 /* Return a pointer to the next token in the token stream, but do not
967 consume it. */
971 {
973 {
977 }
979 }
981 /* Return true if the next token has the indicated TYPE. */
985 {
987 }
989 /* Return true if the next token does not have the indicated TYPE. */
993 {
995 }
997 /* Return true if the next token is the indicated KEYWORD. */
1001 {
1003 }
1007 {
1009 }
1013 {
1015 }
1017 /* Return true if KEYWORD can start a decl-specifier. */
1019 bool
1021 {
1023 {
1024 /* auto specifier: storage-class-specifier in C++,
1025 simple-type-specifier in C++0x. */
1027 /* Storage classes. */
1033 /* Elaborated type specifiers. */
1039 /* Simple type specifiers. */
1054 /* CV qualifiers. */
1057 /* Function specifiers. */
1060 /* friend/typdef/inline specifiers. */
1064 /* GNU extensions. */
1066 /* C++11 extensions. */
1070 /* C++20 extensions. */
1081 }
1082 }
1084 /* Return true if the next token is a keyword for a decl-specifier. */
1086 static bool
1088 {
1093 }
1095 /* Returns TRUE iff the token T begins a decltype type. */
1097 static bool
1099 {
1102 }
1104 /* Returns TRUE iff the next token begins a decltype type. */
1106 static bool
1108 {
1111 }
1113 /* Called when processing a token with tree_check_value; perform or defer the
1114 associated checks and return the value. */
1116 static tree
1118 {
1119 /* Perform any access checks that were deferred. */
1124 {
1130 }
1131 /* Return the stored value. */
1133 }
1135 /* Return a pointer to the Nth token in the token stream. If N is 1,
1136 then this is precisely equivalent to cp_lexer_peek_token (except
1137 that it is not inline). One would like to disallow that case, but
1138 there is one case (cp_parser_nth_token_starts_template_id) where
1139 the caller passes a variable for N and it might be 1. */
1143 {
1146 /* N is 1-based, not zero-based. */
1156 {
1160 }
1163 {
1166 }
1169 }
1171 /* Return the next token, and advance the lexer's next_token pointer
1172 to point to the next non-purged token. */
1176 {
1179 do
1180 {
1183 }
1188 /* Provide debugging output. */
1190 {
1194 }
1197 }
1199 /* Permanently remove the next token from the token stream, and
1200 advance the next_token pointer to refer to the next non-purged
1201 token. */
1203 static void
1205 {
1214 do
1215 tok++;
1218 }
1220 /* Permanently remove all tokens after TOK, up to, but not
1221 including, the token that will be returned next by
1222 cp_lexer_peek_token. */
1224 static void
1226 {
1232 {
1237 }
1238 }
1240 /* Begin saving tokens. All tokens consumed after this point will be
1241 preserved. */
1243 static void
1245 {
1246 /* Provide debugging output. */
1251 }
1253 /* Commit to the portion of the token stream most recently saved. */
1255 static void
1257 {
1258 /* Provide debugging output. */
1263 }
1265 /* Return all tokens saved since the last call to cp_lexer_save_tokens
1266 to the token stream. Stop saving tokens. */
1268 static void
1270 {
1271 /* Provide debugging output. */
1276 }
1278 /* Determines what saved_token_sentinel does when going out of scope. */
1281 STS_COMMIT,
1282 STS_ROLLBACK,
1283 STS_DONOTHING
1284 };
1286 /* RAII wrapper around the above functions, with sanity checking (the token
1287 stream should be the same at the point of instantiation as it is at the
1288 point of destruction).
1290 Creating a variable saves tokens. MODE determines what happens when the
1291 object is destroyed. STS_COMMIT commits tokens (default),
1292 STS_ROLLBACK rolls-back and STS_DONOTHING does nothing. Calling
1293 rollback() will immediately roll-back tokens and set MODE to
1294 STS_DONOTHING. */
1296 struct saved_token_sentinel
1297 {
1300 saved_token_sentinel_mode mode;
1304 {
1307 }
1309 {
1311 cp_lexer_set_source_position_from_token
1314 }
1316 {
1323 }
1324 };
1326 /* Print a representation of the TOKEN on the STREAM. */
1328 static void
1330 {
1331 /* We don't use cpp_type2name here because the parser defines
1332 a few tokens of its own. */
1334 /* cpplib-defined token types */
1335 #define OP(e, s) #e,
1336 #define TK(e, s) #e,
1337 TTYPE_TABLE
1338 #undef OP
1339 #undef TK
1340 /* C++ parser token types - see "Manifest constants", above. */
1344 };
1346 /* For some tokens, print the associated data. */
1348 {
1350 /* Some keywords have a value that is not an IDENTIFIER_NODE.
1351 For example, `struct' is mapped to an INTEGER_CST. */
1354 /* fall through */
1372 /* If we have a name for the token, print it out. Otherwise, we
1373 simply give the numeric code. */
1376 else
1379 }
1380 }
1382 DEBUG_FUNCTION void
1384 {
1387 }
1389 DEBUG_FUNCTION void
1391 {
1394 else
1396 }
1399 /* Start emitting debugging information. */
1401 static void
1403 {
1410 }
1412 /* Stop emitting debugging information. */
1414 static void
1416 {
1423 }
1425 /* Create a new cp_token_cache, representing a range of tokens. */
1429 {
1434 }
1436 /* Diagnose if #pragma omp declare simd isn't followed immediately
1437 by function declaration or definition. */
1441 {
1443 {
1448 }
1449 }
1451 /* Finalize #pragma omp declare simd clauses after FNDECL has been parsed,
1452 and put that into "omp declare simd" attribute. */
1456 {
1458 {
1460 {
1463 }
1465 {
1468 }
1469 }
1470 }
1472 /* Similarly, but for use in declaration parsing functions
1473 which call cp_parser_handle_directive_omp_attributes. */
1477 {
1484 "%<declare %s%> directive not immediately followed by "
1488 }
1490 /* Diagnose if #pragma acc routine isn't followed immediately by function
1491 declaration or definition. */
1495 {
1497 {
1499 "%<#pragma acc routine%> not immediately followed by "
1502 }
1503 }
1504 \f
1505 /* Decl-specifiers. */
1507 /* Set *DECL_SPECS to represent an empty decl-specifier-seq. */
1509 static void
1511 {
1513 }
1515 /* Declarators. */
1517 /* Nothing other than the parser should be creating declarators;
1518 declarators are a semi-syntactic representation of C++ entities.
1519 Other parts of the front end that need to create entities (like
1520 VAR_DECLs or FUNCTION_DECLs) should do that directly. */
1534 /* An erroneous declarator. */
1537 /* The obstack on which declarators and related data structures are
1538 allocated. */
1541 /* Alloc BYTES from the declarator memory pool. */
1545 {
1547 }
1549 /* Allocate a declarator of the indicated KIND. Clear fields that are
1550 common to all declarators. */
1554 {
1568 }
1570 /* Make a declarator for a generalized identifier. If
1571 QUALIFYING_SCOPE is non-NULL, the identifier is
1572 QUALIFYING_SCOPE::UNQUALIFIED_NAME; otherwise, it is just
1573 UNQUALIFIED_NAME. SFK indicates the kind of special function this
1574 is, if any. */
1579 {
1582 /* It is valid to write:
1584 class C { void f(); };
1585 typedef C D;
1586 void D::f();
1588 The standard is not clear about whether `typedef const C D' is
1589 legal; as of 2002-09-15 the committee is considering that
1590 question. EDG 3.0 allows that syntax. Therefore, we do as
1591 well. */
1606 }
1608 /* Make a declarator for a pointer to TARGET. CV_QUALIFIERS is a list
1609 of modifiers such as const or volatile to apply to the pointer
1610 type, represented as identifiers. ATTRIBUTES represent the attributes that
1611 appertain to the pointer or reference. */
1613 cp_declarator *
1615 tree attributes)
1616 {
1624 {
1628 }
1629 else
1635 }
1637 /* Like make_pointer_declarator -- but for references. ATTRIBUTES
1638 represent the attributes that appertain to the pointer or
1639 reference. */
1641 cp_declarator *
1644 {
1652 {
1656 }
1657 else
1663 }
1665 /* Like make_pointer_declarator -- but for a pointer to a non-static
1666 member of CLASS_TYPE. ATTRIBUTES represent the attributes that
1667 appertain to the pointer or reference. */
1669 cp_declarator *
1672 tree attributes)
1673 {
1682 {
1685 }
1686 else
1692 }
1694 /* Make a declarator for the function given by TARGET, with the
1695 indicated PARMS. The CV_QUALIFIERS apply to the function, as in
1696 "const"-qualified member function. The EXCEPTION_SPECIFICATION
1697 indicates what exceptions can be thrown. */
1699 cp_declarator *
1701 tree parms,
1702 cp_cv_quals cv_qualifiers,
1703 cp_virt_specifiers virt_specifiers,
1704 cp_ref_qualifier ref_qualifier,
1705 tree tx_qualifier,
1706 tree exception_specification,
1707 tree late_return_type,
1708 tree requires_clause,
1709 location_t parens_loc)
1710 {
1725 {
1729 }
1730 else
1734 }
1736 /* Make a declarator for an array of BOUNDS elements, each of which is
1737 defined by ELEMENT. */
1739 cp_declarator *
1741 {
1748 {
1752 }
1753 else
1757 }
1759 /* Determine whether the declarator we've seen so far can be a
1760 parameter pack, when followed by an ellipsis. */
1761 static bool
1763 {
1765 /* We already saw an ellipsis. */
1768 /* Search for a declarator name, or any other declarator that goes
1769 after the point where the ellipsis could appear in a parameter
1770 pack. If we find any of these, then this declarator cannot be
1771 made into a parameter pack. */
1774 {
1776 {
1789 }
1790 }
1793 }
1797 /* Create a parameter declarator with the indicated DECL_SPECIFIERS,
1798 DECLARATOR and DEFAULT_ARGUMENT. */
1800 cp_parameter_declarator *
1803 tree default_argument,
1804 location_t loc,
1806 {
1814 else
1822 }
1824 /* Returns true iff DECLARATOR is a declaration for a function. */
1826 static bool
1828 {
1830 {
1839 }
1841 }
1843 /* The parser. */
1845 /* Overview
1846 --------
1848 A cp_parser parses the token stream as specified by the C++
1849 grammar. Its job is purely parsing, not semantic analysis. For
1850 example, the parser breaks the token stream into declarators,
1851 expressions, statements, and other similar syntactic constructs.
1852 It does not check that the types of the expressions on either side
1853 of an assignment-statement are compatible, or that a function is
1854 not declared with a parameter of type `void'.
1856 The parser invokes routines elsewhere in the compiler to perform
1857 semantic analysis and to build up the abstract syntax tree for the
1858 code processed.
1860 The parser (and the template instantiation code, which is, in a
1861 way, a close relative of parsing) are the only parts of the
1862 compiler that should be calling push_scope and pop_scope, or
1863 related functions. The parser (and template instantiation code)
1864 keeps track of what scope is presently active; everything else
1865 should simply honor that. (The code that generates static
1866 initializers may also need to set the scope, in order to check
1867 access control correctly when emitting the initializers.)
1869 Methodology
1870 -----------
1872 The parser is of the standard recursive-descent variety. Upcoming
1873 tokens in the token stream are examined in order to determine which
1874 production to use when parsing a non-terminal. Some C++ constructs
1875 require arbitrary look ahead to disambiguate. For example, it is
1876 impossible, in the general case, to tell whether a statement is an
1877 expression or declaration without scanning the entire statement.
1878 Therefore, the parser is capable of "parsing tentatively." When the
1879 parser is not sure what construct comes next, it enters this mode.
1880 Then, while we attempt to parse the construct, the parser queues up
1881 error messages, rather than issuing them immediately, and saves the
1882 tokens it consumes. If the construct is parsed successfully, the
1883 parser "commits", i.e., it issues any queued error messages and
1884 the tokens that were being preserved are permanently discarded.
1885 If, however, the construct is not parsed successfully, the parser
1886 rolls back its state completely so that it can resume parsing using
1887 a different alternative.
1889 Future Improvements
1890 -------------------
1892 The performance of the parser could probably be improved substantially.
1893 We could often eliminate the need to parse tentatively by looking ahead
1894 a little bit. In some places, this approach might not entirely eliminate
1895 the need to parse tentatively, but it might still speed up the average
1896 case. */
1898 /* Flags that are passed to some parsing functions. These values can
1899 be bitwise-ored together. */
1901 enum
1902 {
1903 /* No flags. */
1905 /* The construct is optional. If it is not present, then no error
1906 should be issued. */
1908 /* When parsing a type-specifier, treat user-defined type-names
1909 as non-type identifiers. */
1911 /* When parsing a type-specifier, do not try to parse a class-specifier
1912 or enum-specifier. */
1914 /* When parsing a decl-specifier-seq, only allow type-specifier or
1915 constexpr. */
1917 /* When parsing a decl-specifier-seq, only allow mutable, constexpr or
1918 for C++20 consteval. */
1920 /* When parsing a decl-specifier-seq, allow missing typename. */
1922 /* When parsing of the noexcept-specifier should be delayed. */
1924 /* When parsing a consteval declarator. */
1926 };
1928 /* This type is used for parameters and variables which hold
1929 combinations of the above flags. */
1932 /* The different kinds of declarators we want to parse. */
1934 enum cp_parser_declarator_kind
1935 {
1936 /* We want an abstract declarator. */
1937 CP_PARSER_DECLARATOR_ABSTRACT,
1938 /* We want a named declarator. */
1939 CP_PARSER_DECLARATOR_NAMED,
1940 /* We don't mind, but the name must be an unqualified-id. */
1941 CP_PARSER_DECLARATOR_EITHER
1942 };
1944 /* The precedence values used to parse binary expressions. The minimum value
1945 of PREC must be 1, because zero is reserved to quickly discriminate
1946 binary operators from other tokens. */
1948 enum cp_parser_prec
1949 {
1950 PREC_NOT_OPERATOR,
1951 PREC_LOGICAL_OR_EXPRESSION,
1952 PREC_LOGICAL_AND_EXPRESSION,
1953 PREC_INCLUSIVE_OR_EXPRESSION,
1954 PREC_EXCLUSIVE_OR_EXPRESSION,
1955 PREC_AND_EXPRESSION,
1956 PREC_EQUALITY_EXPRESSION,
1957 PREC_RELATIONAL_EXPRESSION,
1958 PREC_SPACESHIP_EXPRESSION,
1959 PREC_SHIFT_EXPRESSION,
1960 PREC_ADDITIVE_EXPRESSION,
1961 PREC_MULTIPLICATIVE_EXPRESSION,
1962 PREC_PM_EXPRESSION,
1963 NUM_PREC_VALUES = PREC_PM_EXPRESSION
1964 };
1966 /* A mapping from a token type to a corresponding tree node type, with a
1967 precedence value. */
1969 struct cp_parser_binary_operations_map_node
1970 {
1971 /* The token type. */
1973 /* The corresponding tree code. */
1975 /* The precedence of this operator. */
1977 };
1979 struct cp_parser_expression_stack_entry
1980 {
1981 /* Left hand side of the binary operation we are currently
1982 parsing. */
1983 cp_expr lhs;
1984 /* Original tree code for left hand side, if it was a binary
1985 expression itself (used for -Wparentheses). */
1987 /* Tree code for the binary operation we are parsing. */
1989 /* Precedence of the binary operation we are parsing. */
1991 /* Location of the binary operation we are parsing. */
1992 location_t loc;
1993 };
1995 /* The stack for storing partial expressions. We only need NUM_PREC_VALUES
1996 entries because precedence levels on the stack are monotonically
1997 increasing. */
2001 /* Prototypes. */
2003 /* Constructors and destructors. */
2008 /* Class variables. */
2012 /* The operator-precedence table used by cp_parser_binary_expression.
2013 Transformed into an associative array (binops_by_token) by
2014 cp_parser_new. */
2049 };
2051 /* The same as binops, but initialized by cp_parser_new so that
2052 binops_by_token[N].token_type == N. Used in cp_parser_binary_expression
2053 for speed. */
2056 /* Constructors and destructors. */
2058 /* Construct a new context. The context below this one on the stack
2059 is given by NEXT. */
2063 {
2066 /* Allocate the storage. */
2068 {
2069 /* Pull the first entry from the free list. */
2073 }
2074 else
2077 /* No errors have occurred yet in this context. */
2079 /* If this is not the bottommost context, copy information that we
2080 need from the previous context. */
2082 {
2083 /* If, in the NEXT context, we are parsing an `x->' or `x.'
2084 expression, then we are parsing one in this context, too. */
2086 /* Thread the stack. */
2088 }
2091 }
2093 /* Managing the unparsed function queues. */
2095 #define unparsed_funs_with_default_args \
2096 parser->unparsed_queues->last ().funs_with_default_args
2097 #define unparsed_funs_with_definitions \
2098 parser->unparsed_queues->last ().funs_with_definitions
2099 #define unparsed_nsdmis \
2100 parser->unparsed_queues->last ().nsdmis
2101 #define unparsed_noexcepts \
2102 parser->unparsed_queues->last ().noexcepts
2104 static void
2106 {
2109 }
2111 static void
2113 {
2116 }
2118 /* Prototypes. */
2120 /* Constructors and destructors. */
2125 /* Routines to parse various constructs.
2127 Those that return `tree' will return the error_mark_node (rather
2128 than NULL_TREE) if a parse error occurs, unless otherwise noted.
2129 Sometimes, they will return an ordinary node if error-recovery was
2130 attempted, even though a parse error occurred. So, to check
2131 whether or not a parse error occurred, you should always use
2132 cp_parser_error_occurred. If the construct is optional (indicated
2133 either by an `_opt' in the name of the function that does the
2134 parsing or via a FLAGS parameter), then NULL_TREE is returned if
2135 the construct is not present. */
2137 /* Lexical conventions [gram.lex] */
2139 static cp_expr cp_parser_identifier
2141 static cp_expr cp_parser_string_literal
2143 static cp_expr cp_parser_userdef_char_literal
2145 static tree cp_parser_userdef_string_literal
2147 static cp_expr cp_parser_userdef_numeric_literal
2150 /* Basic concepts [gram.basic] */
2154 /* Expressions [gram.expr] */
2156 static cp_expr cp_parser_primary_expression
2158 static cp_expr cp_parser_id_expression
2160 static cp_expr cp_parser_unqualified_id
2162 static tree cp_parser_nested_name_specifier_opt
2164 static tree cp_parser_nested_name_specifier
2166 static tree cp_parser_qualifying_entity
2168 static cp_expr cp_parser_postfix_expression
2170 static tree cp_parser_postfix_open_square_expression
2172 static tree cp_parser_postfix_dot_deref_expression
2177 /* Values for the second parameter of cp_parser_parenthesized_expression_list. */
2179 static void cp_parser_pseudo_destructor_name
2181 static cp_expr cp_parser_unary_expression
2183 static enum tree_code cp_parser_unary_operator
2185 static tree cp_parser_has_attribute_expression
2187 static tree cp_parser_new_expression
2191 static tree cp_parser_new_type_id
2199 static tree cp_parser_delete_expression
2201 static cp_expr cp_parser_cast_expression
2203 static cp_expr cp_parser_binary_expression
2205 static tree cp_parser_question_colon_clause
2207 static cp_expr cp_parser_assignment_expression
2209 static enum tree_code cp_parser_assignment_operator_opt
2211 static cp_expr cp_parser_expression
2213 static cp_expr cp_parser_constant_expression
2215 static cp_expr cp_parser_builtin_offsetof
2217 static cp_expr cp_parser_lambda_expression
2219 static void cp_parser_lambda_introducer
2221 static bool cp_parser_lambda_declarator_opt
2223 static void cp_parser_lambda_body
2226 /* Statements [gram.stmt.stmt] */
2228 static void cp_parser_statement
2230 static void cp_parser_label_for_labeled_statement
2232 static tree cp_parser_expression_statement
2234 static tree cp_parser_compound_statement
2236 static void cp_parser_statement_seq_opt
2238 static tree cp_parser_selection_statement
2240 static tree cp_parser_condition
2242 static tree cp_parser_iteration_statement
2244 static bool cp_parser_init_statement
2246 static tree cp_parser_for
2248 static tree cp_parser_c_for
2250 static tree cp_parser_range_for
2252 static void do_range_for_auto_deduction
2254 static tree cp_parser_perform_range_for_lookup
2256 static tree cp_parser_range_for_member_function
2258 static tree cp_parser_jump_statement
2260 static void cp_parser_declaration_statement
2263 static tree cp_parser_implicitly_scoped_statement
2265 static void cp_parser_already_scoped_statement
2268 /* State of module-declaration parsing. */
2269 enum module_parse
2270 {
2273 _MP_UNUSED,
2283 };
2285 static module_parse cp_parser_module_declaration
2287 static void cp_parser_import_declaration
2290 /* Declarations [gram.dcl.dcl] */
2292 static void cp_parser_declaration_seq_opt
2294 static void cp_parser_declaration
2296 static void cp_parser_toplevel_declaration
2298 static void cp_parser_block_declaration
2300 static void cp_parser_simple_declaration
2302 static void cp_parser_decl_specifier_seq
2304 static tree cp_parser_storage_class_specifier_opt
2306 static tree cp_parser_function_specifier_opt
2308 static tree cp_parser_type_specifier
2311 static tree cp_parser_simple_type_specifier
2313 static tree cp_parser_placeholder_type_specifier
2315 static tree cp_parser_type_name
2317 static tree cp_parser_nonclass_name
2319 static tree cp_parser_elaborated_type_specifier
2321 static tree cp_parser_enum_specifier
2323 static void cp_parser_enumerator_list
2325 static void cp_parser_enumerator_definition
2327 static tree cp_parser_namespace_name
2329 static void cp_parser_namespace_definition
2331 static void cp_parser_namespace_body
2333 static tree cp_parser_qualified_namespace_specifier
2335 static void cp_parser_namespace_alias_definition
2337 static bool cp_parser_using_declaration
2339 static void cp_parser_using_directive
2341 static void cp_parser_using_enum
2343 static tree cp_parser_alias_declaration
2345 static void cp_parser_asm_definition
2347 static void cp_parser_linkage_specification
2349 static void cp_parser_static_assert
2351 static tree cp_parser_decltype
2353 static tree cp_parser_decomposition_declaration
2356 /* Declarators [gram.dcl.decl] */
2358 static tree cp_parser_init_declarator
2368 static enum tree_code cp_parser_ptr_operator
2370 static cp_cv_quals cp_parser_cv_qualifier_seq_opt
2372 static cp_virt_specifiers cp_parser_virt_specifier_seq_opt
2374 static cp_ref_qualifier cp_parser_ref_qualifier_opt
2376 static tree cp_parser_tx_qualifier_opt
2378 static tree cp_parser_late_return_type_opt
2380 static tree cp_parser_declarator_id
2382 static tree cp_parser_type_id
2384 static tree cp_parser_template_type_arg
2387 static tree cp_parser_type_id_1
2389 static void cp_parser_type_specifier_seq
2391 static tree cp_parser_parameter_declaration_clause
2393 static tree cp_parser_parameter_declaration_list
2397 static tree cp_parser_default_argument
2399 static void cp_parser_function_body
2401 static tree cp_parser_initializer
2403 static cp_expr cp_parser_initializer_clause
2405 static cp_expr cp_parser_braced_list
2410 static void cp_parser_ctor_initializer_opt_and_function_body
2413 static tree cp_parser_late_parsing_omp_declare_simd
2416 static tree cp_parser_late_parsing_oacc_routine
2419 static tree synthesize_implicit_template_parm
2421 static tree finish_fully_implicit_template
2423 static void abort_fully_implicit_template
2426 /* Classes [gram.class] */
2428 static tree cp_parser_class_name
2430 static tree cp_parser_class_specifier
2432 static tree cp_parser_class_head
2434 static enum tag_types cp_parser_class_key
2436 static void cp_parser_type_parameter_key
2438 static void cp_parser_member_specification_opt
2440 static void cp_parser_member_declaration
2442 static tree cp_parser_pure_specifier
2444 static tree cp_parser_constant_initializer
2447 /* Derived classes [gram.class.derived] */
2449 static tree cp_parser_base_clause
2451 static tree cp_parser_base_specifier
2454 /* Special member functions [gram.special] */
2456 static tree cp_parser_conversion_function_id
2458 static tree cp_parser_conversion_type_id
2462 static void cp_parser_ctor_initializer_opt
2464 static void cp_parser_mem_initializer_list
2466 static tree cp_parser_mem_initializer
2468 static tree cp_parser_mem_initializer_id
2471 /* Overloading [gram.over] */
2473 static cp_expr cp_parser_operator_function_id
2475 static cp_expr cp_parser_operator
2478 /* Templates [gram.temp] */
2480 static void cp_parser_template_declaration
2482 static tree cp_parser_template_parameter_list
2484 static tree cp_parser_template_parameter
2486 static tree cp_parser_type_parameter
2488 static tree cp_parser_template_id
2490 static tree cp_parser_template_id_expr
2492 static tree cp_parser_template_name
2494 static tree cp_parser_template_argument_list
2496 static tree cp_parser_template_argument
2498 static void cp_parser_explicit_instantiation
2500 static void cp_parser_explicit_specialization
2503 /* Exception handling [gram.except] */
2505 static tree cp_parser_try_block
2507 static void cp_parser_function_try_block
2509 static void cp_parser_handler_seq
2511 static void cp_parser_handler
2513 static tree cp_parser_exception_declaration
2515 static tree cp_parser_throw_expression
2517 static tree cp_parser_exception_specification_opt
2519 static tree cp_parser_type_id_list
2521 static tree cp_parser_noexcept_specification_opt
2524 /* GNU Extensions */
2526 static tree cp_parser_asm_specification_opt
2528 static tree cp_parser_asm_operand_list
2530 static tree cp_parser_asm_clobber_list
2532 static tree cp_parser_asm_label_list
2534 static bool cp_next_tokens_can_be_attribute_p
2536 static bool cp_next_tokens_can_be_gnu_attribute_p
2538 static bool cp_next_tokens_can_be_std_attribute_p
2540 static bool cp_nth_tokens_can_be_std_attribute_p
2542 static bool cp_nth_tokens_can_be_gnu_attribute_p
2544 static bool cp_nth_tokens_can_be_attribute_p
2546 static tree cp_parser_attributes_opt
2548 static tree cp_parser_gnu_attributes_opt
2550 static tree cp_parser_gnu_attribute_list
2552 static tree cp_parser_std_attribute
2554 static tree cp_parser_std_attribute_spec
2556 static tree cp_parser_std_attribute_spec_seq
2558 static size_t cp_parser_skip_std_attribute_spec_seq
2560 static size_t cp_parser_skip_attributes_opt
2562 static bool cp_parser_extension_opt
2564 static void cp_parser_label_declaration
2567 /* Concept Extensions */
2569 static tree cp_parser_concept_definition
2571 static tree cp_parser_constraint_expression
2573 static tree cp_parser_requires_clause_opt
2575 static tree cp_parser_requires_expression
2577 static tree cp_parser_requirement_parameter_list
2579 static tree cp_parser_requirement_body
2581 static tree cp_parser_requirement_seq
2583 static tree cp_parser_requirement
2585 static tree cp_parser_simple_requirement
2587 static tree cp_parser_compound_requirement
2589 static tree cp_parser_type_requirement
2591 static tree cp_parser_nested_requirement
2594 /* Transactional Memory Extensions */
2596 static tree cp_parser_transaction
2598 static tree cp_parser_transaction_expression
2600 static void cp_parser_function_transaction
2602 static tree cp_parser_transaction_cancel
2605 /* Coroutine extensions. */
2607 static tree cp_parser_yield_expression
2612 pragma_external,
2613 pragma_member,
2614 pragma_objc_icode,
2615 pragma_stmt,
2616 pragma_compound
2617 };
2618 static bool cp_parser_pragma
2621 /* Objective-C++ Productions */
2623 static tree cp_parser_objc_message_receiver
2625 static tree cp_parser_objc_message_args
2627 static tree cp_parser_objc_message_expression
2629 static cp_expr cp_parser_objc_encode_expression
2631 static tree cp_parser_objc_defs_expression
2633 static tree cp_parser_objc_protocol_expression
2635 static tree cp_parser_objc_selector_expression
2637 static cp_expr cp_parser_objc_expression
2639 static bool cp_parser_objc_selector_p
2641 static tree cp_parser_objc_selector
2643 static tree cp_parser_objc_protocol_refs_opt
2645 static void cp_parser_objc_declaration
2647 static tree cp_parser_objc_statement
2649 static bool cp_parser_objc_valid_prefix_attributes
2651 static void cp_parser_objc_at_property_declaration
2653 static void cp_parser_objc_at_synthesize_declaration
2655 static void cp_parser_objc_at_dynamic_declaration
2657 static tree cp_parser_objc_struct_declaration
2660 /* Utility Routines */
2662 static cp_expr cp_parser_lookup_name
2664 static tree cp_parser_lookup_name_simple
2666 static tree cp_parser_maybe_treat_template_as_class
2668 static bool cp_parser_check_declarator_template_parameters
2670 static bool cp_parser_check_template_parameters
2672 static cp_expr cp_parser_simple_cast_expression
2674 static tree cp_parser_global_scope_opt
2676 static bool cp_parser_constructor_declarator_p
2678 static tree cp_parser_function_definition_from_specifiers_and_declarator
2680 static tree cp_parser_function_definition_after_declarator
2682 static bool cp_parser_template_declaration_after_export
2684 static void cp_parser_perform_template_parameter_access_checks
2686 static tree cp_parser_single_declaration
2688 static cp_expr cp_parser_functional_cast
2690 static tree cp_parser_save_member_function_body
2692 static tree cp_parser_save_nsdmi
2694 static tree cp_parser_enclosed_template_argument_list
2696 static void cp_parser_save_default_args
2698 static void cp_parser_late_parsing_for_member
2700 static tree cp_parser_late_parse_one_default_arg
2702 static void cp_parser_late_parsing_nsdmi
2704 static void cp_parser_late_parsing_default_args
2706 static tree cp_parser_sizeof_operand
2708 static cp_expr cp_parser_trait_expr
2710 static bool cp_parser_declares_only_class_p
2712 static void cp_parser_set_storage_class
2714 static void cp_parser_set_decl_spec_type
2716 static void set_and_check_decl_spec_loc
2719 static bool cp_parser_friend_p
2721 static void cp_parser_required_error
2727 static bool cp_parser_token_starts_function_definition_p
2729 static bool cp_parser_next_token_starts_class_definition_p
2731 static bool cp_parser_next_token_ends_template_argument_p
2733 static bool cp_parser_nth_token_starts_template_argument_list_p
2735 static enum tag_types cp_parser_token_is_class_key
2737 static enum tag_types cp_parser_token_is_type_parameter_key
2740 static void cp_parser_check_class_key
2742 static void cp_parser_check_access_in_redeclaration
2744 static bool cp_parser_optional_template_keyword
2746 static void cp_parser_pre_parsed_nested_name_specifier
2748 static bool cp_parser_cache_group
2750 static tree cp_parser_cache_defarg
2752 static void cp_parser_parse_tentatively
2754 static void cp_parser_commit_to_tentative_parse
2756 static void cp_parser_commit_to_topmost_tentative_parse
2758 static void cp_parser_abort_tentative_parse
2760 static bool cp_parser_parse_definitely
2764 static bool cp_parser_uncommitted_to_tentative_parse_p
2766 static void cp_parser_error
2768 static void cp_parser_name_lookup_error
2770 static bool cp_parser_simulate_error
2772 static bool cp_parser_check_type_definition
2774 static void cp_parser_check_for_definition_in_return_type
2776 static void cp_parser_check_for_invalid_template_id
2778 static bool cp_parser_non_integral_constant_expression
2780 static void cp_parser_diagnose_invalid_type_name
2782 static bool cp_parser_parse_and_diagnose_invalid_type_name
2784 static int cp_parser_skip_to_closing_parenthesis
2786 static void cp_parser_skip_to_end_of_statement
2788 static void cp_parser_consume_semicolon_at_end_of_statement
2790 static void cp_parser_skip_to_end_of_block_or_statement
2792 static bool cp_parser_skip_to_closing_brace
2794 static bool cp_parser_skip_entire_template_parameter_list
2796 static void cp_parser_require_end_of_template_parameter_list
2798 static bool cp_parser_skip_to_end_of_template_parameter_list
2800 static void cp_parser_skip_to_pragma_eol
2802 static bool cp_parser_error_occurred
2804 static bool cp_parser_allow_gnu_extensions_p
2806 static bool cp_parser_is_pure_string_literal
2808 static bool cp_parser_is_string_literal
2810 static bool cp_parser_is_keyword
2812 static tree cp_parser_make_typename_type
2816 static bool cp_parser_compound_literal_p
2818 static bool cp_parser_array_designator_p
2820 static bool cp_parser_init_statement_p
2822 static bool cp_parser_skip_to_closing_square_bracket
2826 // -------------------------------------------------------------------------- //
2827 // Unevaluated Operand Guard
2828 //
2829 // Implementation of an RAII helper for unevaluated operand parsing.
2831 {
2834 }
2837 {
2840 }
2842 // -------------------------------------------------------------------------- //
2843 // Tentative Parsing
2845 /* Returns nonzero if we are parsing tentatively. */
2849 {
2851 }
2853 /* Returns nonzero if TOKEN is a string literal. */
2855 static bool
2857 {
2863 }
2865 /* Returns nonzero if TOKEN is a string literal
2866 of a user-defined string literal. */
2868 static bool
2870 {
2877 }
2879 /* Returns nonzero if TOKEN is the indicated KEYWORD. */
2881 static bool
2883 {
2885 }
2887 /* Return TOKEN's pragma_kind if it is CPP_PRAGMA, otherwise
2888 PRAGMA_NONE. */
2890 static enum pragma_kind
2892 {
2895 /* We smuggled the cpp_token->u.pragma value in an INTEGER_CST. */
2897 }
2899 /* Helper function for cp_parser_error.
2900 Having peeked a token of kind TOK1_KIND that might signify
2901 a conflict marker, peek successor tokens to determine
2902 if we actually do have a conflict marker.
2903 Specifically, we consider a run of 7 '<', '=' or '>' characters
2904 at the start of a line as a conflict marker.
2905 These come through the lexer as three pairs and a single,
2906 e.g. three CPP_LSHIFT tokens ("<<") and a CPP_LESS token ('<').
2907 If it returns true, *OUT_LOC is written to with the location/range
2908 of the marker. */
2910 static bool
2913 {
2924 /* It must be at the start of the line. */
2929 /* We have a conflict marker. Construct a location of the form:
2930 <<<<<<<
2931 ^~~~~~~
2932 with start == caret, finishing at the end of the marker. */
2937 }
2939 /* Get a description of the matching symbol to TOKEN_DESC e.g. "(" for
2940 RT_CLOSE_PAREN. */
2944 {
2946 {
2954 }
2955 }
2957 /* Attempt to convert TOKEN_DESC from a required_token to an
2958 enum cpp_ttype, returning CPP_EOF if there is no good conversion. */
2960 static enum cpp_ttype
2962 {
2964 {
2985 /* Use CPP_EOF as a "no completions possible" code. */
2987 }
2988 }
2991 /* Subroutine of cp_parser_error and cp_parser_required_error.
2993 Issue a diagnostic of the form
2994 FILE:LINE: MESSAGE before TOKEN
2995 where TOKEN is the next token in the input stream. MESSAGE
2996 (specified by the caller) is usually of the form "expected
2997 OTHER-TOKEN".
2999 This bypasses the check for tentative passing, and potentially
3000 adds material needed by cp_parser_required_error.
3002 If MISSING_TOKEN_DESC is not RT_NONE, then potentially add fix-it hints
3003 suggesting insertion of the missing token.
3005 Additionally, if MATCHING_LOCATION is not UNKNOWN_LOCATION, then we
3006 have an unmatched symbol at MATCHING_LOCATION; highlight this secondary
3007 location. */
3009 static void
3011 required_token missing_token_desc,
3012 location_t matching_location)
3013 {
3015 /* This diagnostic makes more sense if it is tagged to the line
3016 of the token we just peeked at. */
3020 {
3025 }
3027 /* If this is actually a conflict marker, report it as such. */
3031 {
3032 location_t loc;
3034 {
3037 /* Consume tokens until the end of the source line. */
3039 {
3053 }
3055 }
3056 }
3058 auto_diagnostic_group d;
3065 {
3066 /* Potentially supply a fix-it hint, suggesting to add the
3067 missing token immediately after the *previous* token.
3068 This may move the primary location within richloc. */
3072 prev_token_loc);
3074 /* If matching_location != UNKNOWN_LOCATION, highlight it.
3075 Attempt to consolidate diagnostics by printing it as a
3076 secondary range within the main diagnostic. */
3078 added_matching_location
3080 }
3082 /* If we were parsing a string-literal and there is an unknown name
3083 token right after, then check to see if that could also have been
3084 a literal string by checking the name against a list of known
3085 standard string literal constants defined in header files. If
3086 there is one, then add that as an hint to the error message. */
3087 name_hint h;
3091 {
3098 token_name,
3099 header_hint));
3100 }
3102 /* Actually emit the error. */
3104 /* Because c_parser_error does not understand
3105 CPP_KEYWORD, keywords are treated like
3106 identifiers. */
3111 {
3112 /* If we weren't able to consolidate matching_location, then
3113 print it as a secondary diagnostic. */
3118 }
3119 }
3121 /* If not parsing tentatively, issue a diagnostic of the form
3122 FILE:LINE: MESSAGE before TOKEN
3123 where TOKEN is the next token in the input stream. MESSAGE
3124 (specified by the caller) is usually of the form "expected
3125 OTHER-TOKEN". */
3127 static void
3129 {
3132 }
3134 /* Issue an error about name-lookup failing. NAME is the
3135 IDENTIFIER_NODE DECL is the result of
3136 the lookup (as returned from cp_parser_lookup_name). DESIRED is
3137 the thing that we hoped to find. */
3139 static void
3141 tree name,
3142 tree decl,
3143 name_lookup_error desired,
3144 location_t location)
3145 {
3146 /* If name lookup completely failed, tell the user that NAME was not
3147 declared. */
3149 {
3162 else
3164 }
3166 {
3168 {
3185 }
3186 }
3188 {
3190 {
3200 name);
3204 }
3205 }
3206 else
3207 {
3209 {
3222 }
3223 }
3224 }
3226 /* If we are parsing tentatively, remember that an error has occurred
3227 during this tentative parse. Returns true if the error was
3228 simulated; false if a message should be issued by the caller. */
3230 static bool
3232 {
3234 {
3237 }
3239 }
3241 /* This function is called when a type is defined. If type
3242 definitions are forbidden at this point, an error message is
3243 issued. */
3245 static bool
3247 {
3248 /* If types are forbidden here, issue a message. */
3250 {
3251 /* Don't use `%s' to print the string, because quotations (`%<', `%>')
3252 or %qs in the message need to be interpreted. */
3256 }
3258 }
3260 /* This function is called when the DECLARATOR is processed. The TYPE
3261 was a type defined in the decl-specifiers. If it is invalid to
3262 define a type in the decl-specifiers for DECLARATOR, an error is
3263 issued. TYPE_LOCATION is the location of TYPE and is used
3264 for error reporting. */
3266 static void
3269 {
3270 /* [dcl.fct] forbids type definitions in return types.
3271 Unfortunately, it's not easy to know whether or not we are
3272 processing a return type until after the fact. */
3280 {
3285 type);
3286 }
3287 }
3289 /* A type-specifier (TYPE) has been parsed which cannot be followed by
3290 "<" in any valid C++ program. If the next token is indeed "<",
3291 issue a message warning the user about what appears to be an
3292 invalid attempt to form a template-id. LOCATION is the location
3293 of the type-specifier (TYPE) */
3295 static void
3297 tree type,
3299 location_t location)
3300 {
3304 {
3310 {
3313 else
3315 }
3316 else
3318 /* Remember the location of the invalid "<". */
3321 /* Consume the "<". */
3323 /* Parse the template arguments. */
3325 /* Permanently remove the invalid template arguments so that
3326 this error message is not issued again. */
3329 }
3330 }
3332 /* If parsing an integral constant-expression, issue an error message
3333 about the fact that THING appeared and return true. Otherwise,
3334 return false. In either case, set
3335 PARSER->NON_INTEGRAL_CONSTANT_EXPRESSION_P. */
3337 static bool
3339 non_integral_constant thing)
3340 {
3343 {
3345 {
3348 {
3351 "ISO C++ forbids using a floating-point literal "
3356 "enumeration type cannot appear in a "
3447 }
3451 }
3452 }
3454 }
3456 /* Emit a diagnostic for an invalid type name. This function commits
3457 to the current active tentative parse, if any. (Otherwise, the
3458 problematic construct might be encountered again later, resulting
3459 in duplicate error messages.) LOCATION is the location of ID. */
3461 static void
3463 location_t location)
3464 {
3467 /* Try to lookup the identifier. */
3474 /* If the lookup was ambiguous, an error will already have
3475 been issued. */
3477 /* If the lookup found a template-name, it means that the user forgot
3478 to specify an argument list. Emit a useful error message. */
3480 {
3481 auto_diagnostic_group d;
3484 decl);
3489 }
3493 /* Something like 'unsigned A a;' */
3496 {
3497 /* Issue an error message. */
3498 auto_diagnostic_group d;
3499 name_hint hint;
3503 {
3509 }
3510 else
3512 /* If we're in a template class, it's possible that the user was
3513 referring to a type from a base class. For example:
3515 template <typename T> struct A { typedef T X; };
3516 template <typename T> struct B : public A<T> { X x; };
3518 The user should have said "typename A<T>::X". */
3527 {
3530 id);
3533 id);
3534 else
3537 }
3554 {
3557 {
3561 {
3562 /* Go from a particular instantiation of the
3563 template (which will have an empty TYPE_FIELDs),
3564 to the main version. */
3570 {
3575 }
3576 }
3577 }
3578 found:;
3579 }
3580 }
3581 /* Here we diagnose qualified-ids where the scope is actually correct,
3582 but the identifier does not resolve to a valid type name. */
3584 {
3586 {
3587 auto_diagnostic_group d;
3588 name_hint hint;
3597 {
3600 "%qE in namespace %qE does not name a template"
3603 else
3607 }
3609 {
3612 "%qE in namespace %qE does not name a template"
3615 else
3617 "%qE in namespace %qE does not name a template"
3620 }
3621 else
3622 {
3625 "%qE in namespace %qE does not name a type"
3628 else
3632 }
3635 }
3638 {
3639 /* A<T>::A<T>() */
3640 auto_diagnostic_group d;
3646 }
3649 {
3654 "need %<typename%> before %<%T::%D::%E%> because "
3658 id,
3661 else
3665 }
3667 {
3668 auto_diagnostic_group d;
3680 else
3686 }
3687 else
3689 }
3690 }
3692 /* Check for a common situation where a type-name should be present,
3693 but is not, and issue a sensible error message. Returns true if an
3694 invalid type-name was detected.
3696 The situation handled by this function are variable declarations of the
3697 form `ID a', where `ID' is an id-expression and `a' is a plain identifier.
3698 Usually, `ID' should name a type, but if we got here it means that it
3699 does not. We try to emit the best possible error message depending on
3700 how exactly the id-expression looks like. */
3702 static bool
3704 {
3705 tree id;
3708 /* Avoid duplicate error about ambiguous lookup. */
3710 {
3714 }
3723 /* If the next token is a (, this is a function with no explicit return
3724 type, i.e. constructor, destructor or conversion op. */
3727 {
3730 }
3734 /* Emit a diagnostic for the invalid type. */
3736 out:
3737 /* If we aren't in the middle of a declarator (i.e. in a
3738 parameter-declaration-clause), skip to the end of the declaration;
3739 there's no point in trying to process it. */
3743 }
3745 /* Consume tokens up to, and including, the next non-nested closing `)'.
3746 Returns 1 iff we found a closing `)'. RECOVERING is true, if we
3747 are doing error recovery. Returns -1 if OR_TTYPE is not CPP_EOF and we
3748 found an unnested token of that type. */
3750 static int
3753 cpp_ttype or_ttype,
3755 {
3766 {
3769 /* Have we found what we're looking for before the closing paren? */
3775 {
3779 /* FALLTHRU */
3781 /* If we've run out of tokens, then there is no closing `)'. */
3784 /* This is good for lambda expression capture-lists. */
3794 /* This matches the processing in skip_to_end_of_statement. */
3814 {
3818 }
3828 condop_depth--;
3836 /* FALLTHROUGH */
3839 /* We fell into a pragma. Skip it, and continue. */
3845 }
3847 /* Consume the token. */
3849 }
3850 }
3852 /* Consume tokens up to, and including, the next non-nested closing `)'.
3853 Returns 1 iff we found a closing `)'. RECOVERING is true, if we
3854 are doing error recovery. Returns -1 if OR_COMMA is true and we
3855 found an unnested token of that type. */
3857 static int
3862 {
3866 }
3868 /* Consume tokens until we reach the end of the current statement.
3869 Normally, that will be just before consuming a `;'. However, if a
3870 non-nested `}' comes first, then we stop before consuming that. */
3872 static void
3874 {
3877 /* Unwind generic function template scope if necessary. */
3882 {
3886 {
3890 /* FALLTHRU */
3892 /* If we've run out of tokens, stop. */
3896 /* If the next token is a `;', we have reached the end of the
3897 statement. */
3903 /* If this is a non-nested '}', stop before consuming it.
3904 That way, when confronted with something like:
3906 { 3 + }
3908 we stop before consuming the closing '}', even though we
3909 have not yet reached a `;'. */
3913 /* If it is the closing '}' for a block that we have
3914 scanned, stop -- but only after consuming the token.
3915 That way given:
3917 void f g () { ... }
3918 typedef int I;
3920 we will stop after the body of the erroneously declared
3921 function, but before consuming the following `typedef'
3922 declaration. */
3924 {
3927 }
3939 /* FALLTHROUGH */
3942 /* We fell into a pragma. Skip it, and continue or return. */
3950 }
3952 /* Consume the token. */
3954 }
3955 }
3957 /* This function is called at the end of a statement or declaration.
3958 If the next token is a semicolon, it is consumed; otherwise, error
3959 recovery is attempted. */
3961 static void
3963 {
3964 /* Look for the trailing `;'. */
3966 {
3967 /* If there is additional (erroneous) input, skip to the end of
3968 the statement. */
3970 /* If the next token is now a `;', consume it. */
3973 }
3974 }
3976 /* Skip tokens until we have consumed an entire block, or until we
3977 have consumed a non-nested `;'. */
3979 static void
3981 {
3984 /* Unwind generic function template scope if necessary. */
3989 {
3993 {
3997 /* FALLTHRU */
3999 /* If we've run out of tokens, stop. */
4003 /* Stop if this is an unnested ';'. */
4009 /* Stop if this is an unnested '}', or closes the outermost
4010 nesting level. */
4011 nesting_depth--;
4019 /* Nest. */
4020 nesting_depth++;
4028 /* FALLTHROUGH */
4031 /* Skip it, and continue or return. */
4039 }
4041 /* Consume the token. */
4043 }
4044 }
4046 /* Skip tokens until a non-nested closing curly brace is the next
4047 token, or there are no more tokens. Return true in the first case,
4048 false otherwise. */
4050 static bool
4052 {
4056 {
4060 {
4064 /* FALLTHRU */
4066 /* If we've run out of tokens, stop. */
4070 /* If the next token is a non-nested `}', then we have reached
4071 the end of the current block. */
4077 /* If it the next token is a `{', then we are entering a new
4078 block. Consume the entire block. */
4084 }
4086 /* Consume the token. */
4088 }
4089 }
4091 /* Consume tokens until we reach the end of the pragma. The PRAGMA_TOK
4092 parameter is the PRAGMA token, allowing us to purge the entire pragma
4093 sequence. PRAGMA_TOK can be NULL, if we're speculatively scanning
4094 forwards (not error recovery). */
4096 static void
4098 {
4101 do
4102 {
4103 /* The preprocessor makes sure that a PRAGMA_EOL token appears
4104 before an EOF token, even when the EOF is on the pragma line.
4105 We should never get here without being inside a deferred
4106 pragma. */
4109 }
4113 {
4117 {
4119 /* Put the current source position back where it was before this
4120 lexer was pushed. */
4122 }
4123 }
4124 }
4126 /* Require pragma end of line, resyncing with it as necessary. The
4127 arguments are as for cp_parser_skip_to_pragma_eol. */
4129 static void
4131 {
4137 {
4139 /* Put the current source position back where it was before this
4140 lexer was pushed. */
4142 }
4143 }
4145 /* This is a simple wrapper around make_typename_type. When the id is
4146 an unresolved identifier node, we can provide a superior diagnostic
4147 using cp_parser_diagnose_invalid_type_name. */
4149 static tree
4151 location_t id_location)
4152 {
4153 tree result;
4155 {
4161 }
4163 }
4165 /* This is a wrapper around the
4166 make_{pointer,ptrmem,reference}_declarator functions that decides
4167 which one to call based on the CODE and CLASS_TYPE arguments. The
4168 CODE argument should be one of the values returned by
4169 cp_parser_ptr_operator. ATTRIBUTES represent the attributes that
4170 appertain to the pointer or reference. */
4174 cp_cv_quals cv_qualifiers,
4176 tree attributes)
4177 {
4184 else
4194 }
4196 /* Create a new C++ parser. */
4200 {
4201 /* Initialize the binops_by_token so that we can get the tree
4202 directly from the token. */
4210 /* For now, we always accept GNU extensions. */
4213 /* The `>' token is a greater-than operator, not the end of a
4214 template-id. */
4219 /* We are not parsing a constant-expression. */
4224 /* Local variable names are not forbidden. */
4227 /* We are not processing an `extern "C"' declaration. */
4230 /* We are not processing a declarator. */
4233 /* We are not processing a template-argument-list. */
4236 /* We are not in an iteration statement. */
4239 /* We are not in a switch statement. */
4242 /* We are not parsing a type-id inside an expression. */
4245 /* String literals should be translated to the execution character set. */
4248 /* We are not parsing a function body. */
4251 /* We can correct until told otherwise. */
4254 /* The unparsed function queue is empty. */
4257 /* There are no classes being defined. */
4260 /* No template parameters apply. */
4263 /* Special parsing data structures. */
4267 /* Not declaring an implicit function template. */
4273 /* Allow constrained-type-specifiers. */
4276 /* We haven't yet seen an 'extern "C"'. */
4280 }
4282 /* Create a cp_lexer structure which will emit the tokens in CACHE
4283 and push it onto the parser's lexer stack. This is used for delayed
4284 parsing of in-class method bodies and default arguments, and should
4285 not be confused with tentative parsing. */
4286 static void
4288 {
4293 /* Move the current source position to that of the first token in the
4294 new lexer. */
4296 }
4298 /* Pop the top lexer off the parser stack. This is never used for the
4299 "main" lexer, only for those pushed by cp_parser_push_lexer_for_tokens. */
4300 static void
4302 {
4307 /* Put the current source position back where it was before this
4308 lexer was pushed. */
4310 }
4312 /* Lexical conventions [gram.lex] */
4314 /* Parse an identifier. Returns an IDENTIFIER_NODE representing the
4315 identifier. */
4317 static cp_expr
4319 {
4322 /* Look for the identifier. */
4324 /* Return the value. */
4327 else
4329 }
4331 /* Parse a sequence of adjacent string constants. Returns a
4332 TREE_STRING representing the combined, nul-terminated string
4333 constant. If TRANSLATE is true, translate the string to the
4334 execution character set. If WIDE_OK is true, a wide string is
4335 invalid here.
4337 C++98 [lex.string] says that if a narrow string literal token is
4338 adjacent to a wide string literal token, the behavior is undefined.
4339 However, C99 6.4.5p4 says that this results in a wide string literal.
4340 We follow C99 here, for consistency with the C front end.
4342 This code is largely lifted from lex_string() in c-lex.cc.
4344 FUTURE: ObjC++ will need to handle @-strings here. */
4345 static cp_expr
4348 {
4349 tree value;
4357 tree string_tree;
4363 {
4366 }
4371 {
4375 }
4376 else
4377 {
4380 }
4383 /* Try to avoid the overhead of creating and destroying an obstack
4384 for the common case of just one string. */
4387 {
4395 {
4399 }
4400 else
4404 }
4405 else
4406 {
4412 do
4413 {
4415 count++;
4420 {
4423 {
4426 }
4429 {
4434 }
4436 }
4437 else
4441 {
4445 {
4449 "concatenation of string literals with "
4451 }
4452 }
4461 {
4465 }
4466 else
4467 {
4471 }
4472 }
4475 /* A string literal built by concatenation has its caret=start at
4476 the start of the initial string, and its finish at the finish of
4477 the final string literal. */
4481 }
4484 {
4487 }
4491 {
4495 {
4499 }
4502 {
4510 else
4522 }
4527 {
4532 else
4534 }
4535 }
4536 else
4537 /* cpp_interpret_string has issued an error. */
4541 {
4544 }
4547 }
4549 /* Look up a literal operator with the name and the exact arguments. */
4551 static tree
4553 {
4559 {
4563 {
4570 {
4580 }
4584 /* May be this should be sufficient_parms_p instead,
4585 depending on how exactly should user-defined literals
4586 work in presence of default arguments on the literal
4587 operator parameters. */
4590 }
4591 }
4594 }
4596 /* Parse a user-defined char constant. Returns a call to a user-defined
4597 literal operator taking the character as an argument. */
4599 static cp_expr
4601 {
4609 /* Build up a call to the user-defined operator */
4610 /* Lookup the name we got back from the id-expression. */
4611 releasing_vec args;
4615 {
4619 }
4622 }
4624 /* A subroutine of cp_parser_userdef_numeric_literal to
4625 create a char... template parameter pack from a string node. */
4627 static tree
4629 {
4630 tree charvec;
4637 /* Fill in CHARVEC with all of the parameters. */
4640 {
4649 }
4651 /* Build the argument packs. */
4657 }
4659 /* A subroutine of cp_parser_userdef_numeric_literal to
4660 create a char... template parameter pack from a string node. */
4662 static tree
4664 {
4665 tree charvec;
4676 /* First template parm is character type. */
4679 /* Fill in CHARVEC with all of the parameters. */
4686 /* Build the argument packs. */
4692 }
4694 /* Parse a user-defined numeric constant. returns a call to a user-defined
4695 literal operator. */
4697 static cp_expr
4699 {
4709 /* Look for a literal operator taking the exact type of numeric argument
4710 as the literal value. */
4711 releasing_vec args;
4715 {
4717 tf_warning_or_error);
4720 {
4723 long_long_unsigned_type_node);
4724 }
4725 else
4726 {
4730 long_double_type_node);
4734 }
4737 }
4739 /* If the numeric argument didn't work, look for a raw literal
4740 operator taking a const char* argument consisting of the number
4741 in string format. */
4746 {
4748 tf_warning_or_error);
4750 }
4752 /* If the raw literal didn't work, look for a non-type template
4753 function with parameter pack char.... Call the function with
4754 template parameter characters representing the number. */
4758 {
4761 {
4763 num_string);
4765 }
4768 tf_warning_or_error);
4770 }
4772 /* In C++14 the standard library defines complex number suffixes that
4773 conflict with GNU extensions. Prefer them if <complex> is #included. */
4783 {
4787 {
4788 /* No <complex>, so pedwarn and use GNU semantics. */
4791 }
4792 }
4794 bool complained
4801 {
4803 "(from %<<complex>%>) to enable the C++14 user-defined literal "
4808 }
4815 else
4816 {
4817 /* Use the built-in semantics. */
4818 tree type;
4820 {
4823 else
4825 }
4833 }
4836 /* Avoid repeated diagnostics. */
4839 }
4841 /* Parse a user-defined string constant. Returns a call to a user-defined
4842 literal operator taking a character pointer and the length of the string
4843 as arguments. */
4845 static tree
4847 {
4853 tree decl;
4855 /* Build up a call to the user-defined operator. */
4856 /* Lookup the name we got back from the id-expression. */
4857 releasing_vec args;
4864 tf_warning_or_error);
4866 /* Look for a suitable template function, either (C++20) with a single
4867 parameter of class type, or (N3599) with typename parameter CharT and
4868 parameter pack CharT... */
4872 {
4873 /* Use resolve_nondeduced_context to try to choose one form of template
4874 or the other. */
4881 else
4882 {
4887 }
4891 tf_warning_or_error);
4892 }
4897 }
4900 /* Basic concepts [gram.basic] */
4902 /* Parse a translation-unit.
4904 translation-unit:
4905 declaration-seq [opt] */
4907 static void
4909 {
4912 /* Create the declarator obstack. */
4914 /* Create the error declarator. */
4916 /* Create the empty parameter list. */
4918 UNKNOWN_LOCATION);
4919 /* Remember where the base of the declarator obstack lies. */
4931 /* Parse until EOF. */
4933 {
4936 /* If we're entering or exiting a region that's implicitly
4937 extern "C", modify the lang context appropriately. This is
4938 so horrible. Please die. */
4941 {
4945 else
4947 }
4953 {
4954 /* Top-level module declarations are ok, and change the
4955 portion of file we're in. Top-level import declarations
4956 are significant for the import portions. */
4961 {
4964 }
4966 {
4967 mp_state
4970 }
4972 {
4977 }
4978 else
4982 {
4985 {
4988 "global module fragment contents must be"
4990 }
4991 }
4992 }
4994 /* This relies on the ordering of module_parse values. */
4996 /* We're no longer in the import portion of a named module. */
5002 {
5005 /* If the next token is now a `;', consume it. */
5008 }
5009 else
5011 }
5013 /* Get rid of the token array; we don't need it any more. */
5017 /* The EOF should have reset this. */
5020 /* Make sure the declarator obstack was fully cleaned up. */
5023 }
5025 /* Return the appropriate tsubst flags for parsing, possibly in N3276
5026 decltype context. */
5030 {
5035 }
5037 /* We're about to parse a collection of statements. If we're currently
5038 parsing tentatively, set up a firewall so that any nested
5039 cp_parser_commit_to_tentative_parse won't affect the current context. */
5041 static cp_token_position
5043 {
5050 }
5052 /* We've finished parsing the collection of statements. Wrap up the
5053 firewall and replace the relevant tokens with the parsed form. */
5055 static void
5057 tree expr)
5058 {
5062 /* Finish the firewall level. */
5064 /* And remember the result of the parse for when we try again. */
5070 }
5072 /* Like the above functions, but let the user modify the tokens. Used by
5073 CPP_DECLTYPE and CPP_TEMPLATE_ID, where we are saving the side-effects for
5074 later parses, so it makes sense to localize the effects of
5075 cp_parser_commit_to_tentative_parse. */
5077 struct tentative_firewall
5078 {
5083 {
5084 /* If we're currently parsing tentatively, start a committed level as a
5085 firewall and then an inner tentative parse. */
5087 {
5091 }
5092 }
5095 {
5097 {
5098 /* Finish the inner tentative parse and the firewall, propagating any
5099 uncommitted error state to the outer tentative parse. */
5105 }
5106 }
5107 };
5109 /* Some tokens naturally come in pairs e.g.'(' and ')'.
5110 This class is for tracking such a matching pair of symbols.
5111 In particular, it tracks the location of the first token,
5112 so that if the second token is missing, we can highlight the
5113 location of the first token when notifying the user about the
5114 problem. */
5117 class token_pair
5118 {
5120 /* token_pair's ctor. */
5123 /* If the next token is the opening symbol for this pair, consume it and
5124 return true.
5125 Otherwise, issue an error and return false.
5126 In either case, record the location of the opening token. */
5129 {
5133 }
5135 /* Consume the next token from PARSER, recording its location as
5136 that of the opening token within the pair. */
5139 {
5144 }
5146 /* If the next token is the closing symbol for this pair, consume it
5147 and return it.
5148 Otherwise, issue an error, highlighting the location of the
5149 corresponding opening token, and return NULL. */
5152 {
5155 m_open_loc);
5156 }
5161 location_t m_open_loc;
5162 };
5164 /* Traits for token_pair<T> for tracking matching pairs of parentheses. */
5166 struct matching_paren_traits
5167 {
5172 };
5174 /* "matching_parens" is a token_pair<T> class for tracking matching
5175 pairs of parentheses. */
5179 /* Traits for token_pair<T> for tracking matching pairs of braces. */
5181 struct matching_brace_traits
5182 {
5187 };
5189 /* "matching_braces" is a token_pair<T> class for tracking matching
5190 pairs of braces. */
5195 /* Parse a GNU statement-expression, i.e. ({ stmts }), except for the
5196 enclosing parentheses. */
5198 static cp_expr
5200 {
5203 /* Consume the '('. */
5205 matching_parens parens;
5207 /* Start the statement-expression. */
5209 /* Parse the compound-statement. */
5211 /* Finish up. */
5213 /* Consume the ')'. */
5221 }
5223 /* Expressions [gram.expr] */
5225 /* Parse a fold-operator.
5227 fold-operator:
5228 - * / % ^ & | = < > << >>
5229 = -= *= /= %= ^= &= |= <<= >>=
5230 == != <= >= && || , .* ->*
5232 This returns the tree code corresponding to the matched operator
5233 as an int. When the current token matches a compound assignment
5234 operator, the resulting tree code is the negative value of the
5235 non-assignment operator. */
5237 static int
5239 {
5241 {
5281 }
5282 }
5284 /* Returns true if CODE indicates a binary expression, which is not allowed in
5285 the LHS of a fold-expression. More codes will need to be added to use this
5286 function in other contexts. */
5288 static bool
5290 {
5292 {
5325 }
5326 }
5328 /* If the next token is a suitable fold operator, consume it and return as
5329 the function above. */
5331 static int
5333 {
5339 }
5341 /* Parse a fold-expression.
5343 fold-expression:
5344 ( ... folding-operator cast-expression)
5345 ( cast-expression folding-operator ... )
5346 ( cast-expression folding operator ... folding-operator cast-expression)
5348 Note that the '(' and ')' are matched in primary expression. */
5350 static cp_expr
5352 {
5353 cp_id_kind pidk;
5355 // Left fold.
5357 {
5363 {
5366 }
5373 }
5378 {
5381 }
5384 {
5387 }
5390 /* The operands of a fold-expression are cast-expressions, so binary or
5391 conditional expressions are not allowed. We check this here to avoid
5392 tentative parsing. */
5404 // Right fold.
5409 {
5412 }
5415 // Binary left or right fold.
5420 }
5422 /* Parse a primary-expression.
5424 primary-expression:
5425 literal
5426 this
5427 ( expression )
5428 id-expression
5429 lambda-expression (C++11)
5431 GNU Extensions:
5433 primary-expression:
5434 ( compound-statement )
5435 __builtin_va_arg ( assignment-expression , type-id )
5436 __builtin_offsetof ( type-id , offsetof-expression )
5438 C++ Extensions:
5439 __has_nothrow_assign ( type-id )
5440 __has_nothrow_constructor ( type-id )
5441 __has_nothrow_copy ( type-id )
5442 __has_trivial_assign ( type-id )
5443 __has_trivial_constructor ( type-id )
5444 __has_trivial_copy ( type-id )
5445 __has_trivial_destructor ( type-id )
5446 __has_virtual_destructor ( type-id )
5447 __is_abstract ( type-id )
5448 __is_base_of ( type-id , type-id )
5449 __is_class ( type-id )
5450 __is_empty ( type-id )
5451 __is_enum ( type-id )
5452 __is_final ( type-id )
5453 __is_literal_type ( type-id )
5454 __is_pod ( type-id )
5455 __is_polymorphic ( type-id )
5456 __is_std_layout ( type-id )
5457 __is_trivial ( type-id )
5458 __is_union ( type-id )
5460 Objective-C++ Extension:
5462 primary-expression:
5463 objc-expression
5465 literal:
5466 __null
5468 ADDRESS_P is true iff this expression was immediately preceded by
5469 "&" and therefore might denote a pointer-to-member. CAST_P is true
5470 iff this expression is the target of a cast. TEMPLATE_ARG_P is
5471 true iff this expression is a template argument.
5473 Returns a representation of the expression. Upon return, *IDK
5474 indicates what kind of id-expression (if any) was present. */
5476 static cp_expr
5483 {
5486 /* Assume the primary expression is not an id-expression. */
5489 /* Peek at the next token. */
5492 {
5493 /* literal:
5494 integer-literal
5495 character-literal
5496 floating-literal
5497 string-literal
5498 boolean-literal
5499 pointer-literal
5500 user-defined-literal */
5512 {
5516 }
5517 /* Floating-point literals are only allowed in an integral
5518 constant expression if they are cast to an integral or
5519 enumeration type. */
5523 {
5524 /* CAST_P will be set even in invalid code like "int(2.7 +
5525 ...)". Therefore, we have to check that the next token
5526 is sure to end the cast. */
5528 {
5533 enumerator-definition. */
5535 /* The curly brace at the end of an enum-specifier. */
5537 /* The end of a statement. */
5539 /* The end of the cast-expression. */
5541 /* The end of an array bound. */
5543 /* The closing ">" in a template-argument-list. */
5546 /* C++0x only: A ">>" treated like two ">" tokens,
5547 in a template-argument-list. */
5552 }
5554 /* If we are within a cast, then the constraint that the
5555 cast is to an integral or enumeration type will be
5556 checked at that point. If we are not within a cast, then
5557 this code is invalid. */
5560 }
5581 /* ??? Should wide strings be allowed when parser->translate_strings_p
5582 is false (i.e. in attributes)? If not, we can kill the third
5583 argument to cp_parser_string_literal. */
5590 /* If we see `( { ' then we are looking at the beginning of
5591 a GNU statement-expression. */
5594 {
5595 /* Statement-expressions are not allowed by the standard. */
5599 /* And they're not allowed outside of a function-body; you
5600 cannot, for example, write:
5602 int i = ({ int j = 3; j + 1; });
5604 at class or namespace scope. */
5607 {
5609 "statement-expressions are not allowed outside "
5615 }
5616 else
5618 }
5619 /* Otherwise it's a normal parenthesized expression. */
5620 {
5621 cp_expr expr;
5626 /* Consume the `('. */
5627 matching_parens parens;
5629 /* Within a parenthesized expression, a `>' token is always
5630 the greater-than operator. */
5631 saved_greater_than_is_operator_p
5636 /* Left fold expression. */
5638 else
5639 /* Parse the parenthesized expression. */
5644 {
5649 "fold-expressions only available with %<-std=c++17%> "
5651 }
5652 else
5653 /* Let the front end know that this expression was
5654 enclosed in parentheses. This matters in case, for
5655 example, the expression is of the form `A::B', since
5656 `&A::B' might be a pointer-to-member, but `&(A::B)' is
5657 not. */
5660 /* DR 705: Wrapping an unqualified name in parentheses
5661 suppresses arg-dependent lookup. We want to pass back
5662 CP_ID_KIND_QUALIFIED for suppressing vtable lookup
5663 (c++/37862), but none of the others. */
5667 /* The `>' token might be the end of a template-id or
5668 template-parameter-list now. */
5669 parser->greater_than_is_operator_p
5672 /* Consume the `)'. */
5684 }
5687 {
5689 {
5690 /* We might have an Objective-C++ message. */
5693 /* If that works out, we're done ... */
5696 /* ... else, fall though to see if it's a lambda. */
5697 }
5699 /* Don't warn about a failed tentative parse. */
5704 }
5708 /* We have an Objective-C++ string literal. */
5715 {
5716 /* These two are the boolean literals. */
5724 /* The `__null' literal. */
5729 /* The `nullptr' literal. */
5734 /* Recognize the `this' keyword. */
5738 {
5742 }
5743 /* Pointers cannot appear in constant-expressions. */
5748 /* The `operator' keyword can be the beginning of an
5749 id-expression. */
5756 {
5757 non_integral_constant name;
5759 /* The symbols __FUNCTION__, __PRETTY_FUNCTION__, and
5760 __func__ are the names of variables -- but they are
5761 treated specially. Therefore, they are handled here,
5762 rather than relying on the generic id-expression logic
5763 below. Grammatically, these names are id-expressions.
5765 Consume the token. */
5769 {
5781 }
5786 /* Look up the name. */
5788 }
5791 {
5792 tree expression;
5793 tree type;
5794 location_t type_location;
5795 location_t start_loc
5797 /* The `__builtin_va_arg' construct is used to handle
5798 `va_arg'. Consume the `__builtin_va_arg' token. */
5800 /* Look for the opening `('. */
5801 matching_parens parens;
5803 /* Now, parse the assignment-expression. */
5805 /* Look for the `,'. */
5808 /* Parse the type-id. */
5809 {
5812 }
5813 /* Look for the closing `)'. */
5814 location_t finish_loc
5817 /* Using `va_arg' in a constant-expression is not
5818 allowed. */
5820 NIC_VA_ARG))
5822 /* Construct a location of the form:
5823 __builtin_va_arg (v, int)
5824 ~~~~~~~~~~~~~~~~~~~~~^~~~
5825 with the caret at the type, ranging from the start of the
5826 "__builtin_va_arg" token to the close paren. */
5827 location_t combined_loc
5830 }
5869 // C++ concepts
5873 /* Objective-C++ expressions. */
5883 "%<omp_all_memory%> may only be used in OpenMP "
5891 {
5896 }
5897 /* FALLTHRU */
5901 }
5903 /* An id-expression can start with either an identifier, a
5904 `::' as the beginning of a qualified-id, or the "operator"
5905 keyword. */
5910 {
5911 id_expression:
5912 cp_expr id_expression;
5913 cp_expr decl;
5919 /* Parse the id-expression. */
5920 id_expression
5937 /* If we have a template-id, then no further lookup is
5938 required. If the template-id was for a template-class, we
5939 will sometimes have a TYPE_DECL at this point. */
5943 /* Look up the name. */
5944 else
5945 {
5946 tree ambiguous_decls;
5948 /* If we already know that this lookup is ambiguous, then
5949 we've already issued an error message; there's no reason
5950 to check again. */
5953 {
5956 }
5959 none_type,
5960 template_p,
5965 /* If the lookup was ambiguous, an error will already have
5966 been issued. */
5970 /* In Objective-C++, we may have an Objective-C 2.0
5971 dot-syntax for classes here. */
5976 {
5977 tree component;
5984 component);
5985 /* Build a location of the form:
5986 expr.component
5987 ~~~~~^~~~~~~~~
5988 with caret at the start of the component name (at
5989 input_location), ranging from the start of the id_expression
5990 to the end of the component name. */
5991 location_t combined_loc
5996 }
5998 /* In Objective-C++, an instance variable (ivar) may be preferred
5999 to whatever cp_parser_lookup_name() found.
6000 Call objc_lookup_ivar. To avoid exposing cp_expr to the
6001 rest of c-family, we have to do a little extra work to preserve
6002 any location information in cp_expr "decl". Given that
6003 objc_lookup_ivar is implemented in "c-family" and "objc", we
6004 have a trip through the pure "tree" type, rather than cp_expr.
6005 Naively copying it back to "decl" would implicitly give the
6006 new cp_expr value an UNKNOWN_LOCATION for nodes that don't
6007 store an EXPR_LOCATION. Hence we only update "decl" (and
6008 hence its location_t) if we get back a different tree node. */
6010 id_expression);
6014 /* If name lookup gives us a SCOPE_REF, then the
6015 qualifying scope was dependent. */
6017 {
6018 /* At this point, we do not know if DECL is a valid
6019 integral constant expression. We assume that it is
6020 in fact such an expression, so that code like:
6022 template <int N> struct A {
6023 int a[B<N>::i];
6024 };
6026 is accepted. At template-instantiation time, we
6027 will check that B<N>::i is actually a constant. */
6029 }
6030 /* Check to see if DECL is a local variable in a context
6031 where that is forbidden. */
6034 /* DR 2082 permits local variables in unevaluated contexts
6035 within a default argument. */
6037 {
6045 }
6046 }
6048 decl = (finish_id_expression
6050 idk,
6055 template_arg_p,
6060 /* Build a location for an id-expression of the form:
6061 ::ns::id
6062 ~~~~~~^~
6063 or:
6064 id
6065 ^~
6066 i.e. from the start of the first token to the end of the final
6067 token, with the caret at the start of the unqualified-id. */
6071 location_t combined_loc
6076 }
6078 /* Anything else is an error. */
6082 }
6083 }
6091 {
6094 }
6096 /* Parse an id-expression.
6098 id-expression:
6099 unqualified-id
6100 qualified-id
6102 qualified-id:
6103 :: [opt] nested-name-specifier template [opt] unqualified-id
6104 :: identifier
6105 :: operator-function-id
6106 :: template-id
6108 Return a representation of the unqualified portion of the
6109 identifier. Sets PARSER->SCOPE to the qualifying scope if there is
6110 a `::' or nested-name-specifier.
6112 Often, if the id-expression was a qualified-id, the caller will
6113 want to make a SCOPE_REF to represent the qualified-id. This
6114 function does not do this in order to avoid wastefully creating
6115 SCOPE_REFs when they are not required.
6117 If TEMPLATE_KEYWORD_P is true, then we have just seen the
6118 `template' keyword.
6120 If CHECK_DEPENDENCY_P is false, then names are looked up inside
6121 uninstantiated templates.
6123 If *TEMPLATE_P is non-NULL, it is set to true iff the
6124 `template' keyword is used to explicitly indicate that the entity
6125 named is a template.
6127 If DECLARATOR_P is true, the id-expression is appearing as part of
6128 a declarator, rather than as part of an expression. */
6130 static cp_expr
6137 {
6141 /* Assume the `template' keyword was not used. */
6145 /* Look for the optional `::' operator. */
6146 global_scope_p
6147 = (!template_keyword_p
6152 /* Look for the optional nested-name-specifier. */
6153 nested_name_specifier_p
6156 check_dependency_p,
6158 declarator_p,
6159 template_keyword_p)
6165 /* Peek at the next token. */
6168 /* If there is a nested-name-specifier, then we are looking at
6169 the first qualified-id production. */
6171 {
6172 tree saved_object_scope;
6173 tree saved_qualifying_scope;
6175 /* See if the next token is the `template' keyword. */
6179 /* Name lookup we do during the processing of the
6180 unqualified-id might obliterate SCOPE. */
6183 /* Process the final unqualified-id. */
6185 check_dependency_p,
6186 declarator_p,
6188 /* Restore the SAVED_SCOPE for our caller. */
6192 }
6193 /* Otherwise, if we are in global scope, then we are looking at one
6194 of the other qualified-id productions. */
6196 {
6197 /* If it's an identifier, and the next token is not a "<", then
6198 we can avoid the template-id case. This is an optimization
6199 for this common case. */
6201 && !cp_parser_nth_token_starts_template_argument_list_p
6206 /* Try a template-id. */
6210 declarator_p);
6211 /* If that worked, we're done. */
6215 /* Peek at the next token. (Changes in the token buffer may
6216 have invalidated the pointer obtained above.) */
6220 {
6227 {
6230 }
6231 /* Fall through. */
6236 }
6237 }
6238 else
6239 {
6244 declarator_p,
6245 optional_p);
6246 }
6249 && warn_missing_template_keyword
6250 && !template_keyword_p
6251 /* Don't warn if we're looking inside templates. */
6252 && check_dependency_p
6253 /* In a template argument list a > could be closing
6254 the enclosing targs. */
6257 /* Don't confuse an ill-formed constructor declarator for a missing
6258 template keyword in a return type. */
6262 OPT_Wmissing_template_keyword))
6263 {
6266 /* An operator after the > suggests that the > ends a
6267 template-id; a name or literal suggests that the > is an
6268 operator. */
6272 "expected %qs keyword before dependent "
6274 }
6277 }
6279 /* Parse an unqualified-id.
6281 unqualified-id:
6282 identifier
6283 operator-function-id
6284 conversion-function-id
6285 ~ class-name
6286 template-id
6288 If TEMPLATE_KEYWORD_P is TRUE, we have just seen the `template'
6289 keyword, in a construct like `A::template ...'.
6291 Returns a representation of unqualified-id. For the `identifier'
6292 production, an IDENTIFIER_NODE is returned. For the `~ class-name'
6293 production a BIT_NOT_EXPR is returned; the operand of the
6294 BIT_NOT_EXPR is an IDENTIFIER_NODE for the class-name. For the
6295 other productions, see the documentation accompanying the
6296 corresponding parsing functions. If CHECK_DEPENDENCY_P is false,
6297 names are looked up in uninstantiated templates. If DECLARATOR_P
6298 is true, the unqualified-id is appearing as part of a declarator,
6299 rather than as part of an expression. */
6301 static cp_expr
6307 {
6310 /* Peek at the next token. */
6314 {
6316 {
6317 tree id;
6319 /* We don't know yet whether or not this will be a
6320 template-id. */
6322 /* Try a template-id. */
6324 check_dependency_p,
6325 declarator_p);
6326 /* If it worked, we're done. */
6329 /* Otherwise, it's an ordinary identifier. */
6331 }
6335 check_dependency_p,
6336 declarator_p);
6339 {
6340 tree type_decl;
6341 tree qualifying_scope;
6342 tree object_scope;
6343 tree scope;
6347 /* Consume the `~' token. */
6349 /* Parse the class-name. The standard, as written, seems to
6350 say that:
6352 template <typename T> struct S { ~S (); };
6353 template <typename T> S<T>::~S() {}
6355 is invalid, since `~' must be followed by a class-name, but
6356 `S<T>' is dependent, and so not known to be a class.
6357 That's not right; we need to look in uninstantiated
6358 templates. A further complication arises from:
6360 template <typename T> void f(T t) {
6361 t.T::~T();
6362 }
6364 Here, it is not possible to look up `T' in the scope of `T'
6365 itself. We must look in both the current scope, and the
6366 scope of the containing complete expression.
6368 Yet another issue is:
6370 struct S {
6371 int S;
6372 ~S();
6373 };
6375 S::~S() {}
6377 The standard does not seem to say that the `S' in `~S'
6378 should refer to the type `S' and not the data member
6379 `S::S'. */
6381 /* DR 244 says that we look up the name after the "~" in the
6382 same scope as we looked up the qualifying name. That idea
6383 isn't fully worked out; it's more complicated than that. */
6388 /* Check for invalid scopes. */
6390 {
6394 }
6396 {
6400 scope);
6405 }
6407 {
6413 }
6419 /* Create a location with caret == start at the tilde,
6420 finishing at the end of the peeked token, e.g:
6421 ~token
6422 ^~~~~~. */
6423 location_t loc
6426 /* If the name is of the form "X::~X" it's OK even if X is a
6427 typedef. */
6436 {
6439 }
6441 /* ~auto means the destructor of whatever the object is. */
6443 {
6446 "%<~auto%> only available with "
6450 }
6452 /* DR 2237 (C++20 only): A simple-template-id is no longer valid as the
6453 declarator-id of a constructor or destructor. */
6456 {
6460 }
6462 /* If there was an explicit qualification (S::~T), first look
6463 in the scope given by the qualification (i.e., S).
6465 Note: in the calls to cp_parser_class_name below we pass
6466 typename_type so that lookup finds the injected-class-name
6467 rather than the constructor. */
6471 {
6476 typename_type,
6479 declarator_p);
6482 }
6483 /* In "N::S::~S", look in "N" as well. */
6485 {
6490 type_decl
6494 typename_type,
6497 declarator_p);
6500 }
6501 /* In "p->S::~T", look in the scope given by "*p" as well. */
6503 {
6508 type_decl
6512 typename_type,
6515 declarator_p);
6518 }
6519 /* Look in the surrounding context. */
6521 {
6527 type_decl
6531 typename_type,
6534 declarator_p);
6537 {
6538 /* We couldn't find a type with this name. If we're parsing
6539 tentatively, fail and try something else. */
6541 {
6544 }
6545 /* Otherwise, accept it and check for a match at instantiation
6546 time. */
6551 }
6552 }
6553 /* If an error occurred, assume that the name of the
6554 destructor is the same as the name of the qualifying
6555 class. That allows us to keep parsing after running
6556 into ill-formed destructor names. */
6562 /* Check that destructor name and scope match. */
6564 {
6571 }
6573 /* [class.dtor]
6575 A typedef-name that names a class shall not be used as the
6576 identifier in the declarator for a destructor declaration. */
6583 type_decl);
6586 }
6590 {
6591 cp_expr id;
6593 /* This could be a template-id, so we try that first. */
6595 /* Try a template-id. */
6598 declarator_p);
6599 /* If that worked, we're done. */
6602 /* We still don't know whether we're looking at an
6603 operator-function-id or a conversion-function-id. */
6605 /* Try an operator-function-id. */
6607 /* If that didn't work, try a conversion-function-id. */
6612 }
6613 /* Fall through. */
6620 }
6621 }
6623 /* Check [temp.names]/5: A name prefixed by the keyword template shall
6624 be a template-id or the name shall refer to a class template or an
6625 alias template. */
6627 static void
6629 {
6639 /* Alias templates are also OK. */
6646 name);
6647 }
6649 /* Parse an (optional) nested-name-specifier.
6651 nested-name-specifier: [C++98]
6652 class-or-namespace-name :: nested-name-specifier [opt]
6653 class-or-namespace-name :: template nested-name-specifier [opt]
6655 nested-name-specifier: [C++0x]
6656 type-name ::
6657 namespace-name ::
6658 nested-name-specifier identifier ::
6659 nested-name-specifier template [opt] simple-template-id ::
6661 PARSER->SCOPE should be set appropriately before this function is
6662 called. TYPENAME_KEYWORD_P is TRUE if the `typename' keyword is in
6663 effect. TYPE_P is TRUE if we non-type bindings should be ignored
6664 in name lookups.
6666 Sets PARSER->SCOPE to the class (TYPE) or namespace
6667 (NAMESPACE_DECL) specified by the nested-name-specifier, or leaves
6668 it unchanged if there is no nested-name-specifier. Returns the new
6669 scope iff there is a nested-name-specifier, or NULL_TREE otherwise.
6671 If CHECK_DEPENDENCY_P is FALSE, names are looked up in dependent scopes.
6673 If IS_DECLARATION is TRUE, the nested-name-specifier is known to be
6674 part of a declaration and/or decl-specifier. */
6676 static tree
6683 {
6688 /* Remember where the nested-name-specifier starts. */
6691 {
6694 }
6697 {
6698 tree new_scope;
6699 tree old_scope;
6700 tree saved_qualifying_scope;
6702 /* Spot cases that cannot be the beginning of a
6703 nested-name-specifier. */
6706 /* If the next token is CPP_NESTED_NAME_SPECIFIER, just process
6707 the already parsed nested-name-specifier. */
6709 {
6710 /* Grab the nested-name-specifier and continue the loop. */
6712 /* If we originally encountered this nested-name-specifier
6713 with CHECK_DEPENDENCY_P set to true, we will not have
6714 resolved TYPENAME_TYPEs, so we must do so here. */
6716 && !check_dependency_p
6718 {
6723 }
6726 }
6728 /* Spot cases that cannot be the beginning of a
6729 nested-name-specifier. On the second and subsequent times
6730 through the loop, we look for the `template' keyword. */
6732 ;
6733 /* A template-id can start a nested-name-specifier. */
6735 ;
6736 /* DR 743: decltype can be used in a nested-name-specifier. */
6738 ;
6739 else
6740 {
6741 /* If the next token is not an identifier, then it is
6742 definitely not a type-name or namespace-name. */
6745 /* If the following token is neither a `<' (to begin a
6746 template-id), nor a `::', then we are not looking at a
6747 nested-name-specifier. */
6753 /* name:name is a valid sequence in an Objective C message. */
6755 {
6759 "found %<:%> in nested-name-specifier, "
6762 }
6765 && !cp_parser_nth_token_starts_template_argument_list_p
6768 }
6770 /* The nested-name-specifier is optional, so we parse
6771 tentatively. */
6774 /* Look for the optional `template' keyword, if this isn't the
6775 first time through the loop. */
6777 {
6779 /* DR1710: "In a qualified-id used as the name in
6780 a typename-specifier, elaborated-type-specifier, using-declaration,
6781 or class-or-decltype, an optional keyword template appearing at
6782 the top level is ignored." */
6784 && typename_keyword_p
6787 }
6789 /* Save the old scope since the name lookup we are about to do
6790 might destroy it. */
6793 /* In a declarator-id like "X<T>::I::Y<T>" we must be able to
6794 look up names in "X<T>::I" in order to determine that "Y" is
6795 a template. So, if we have a typename at this point, we make
6796 an effort to look through it. */
6798 && !check_dependency_p
6799 && !typename_keyword_p
6804 /* Parse the qualifying entity. */
6805 new_scope
6807 typename_keyword_p,
6808 template_keyword_p,
6809 check_dependency_p,
6810 type_p,
6811 is_declaration);
6812 /* Look for the `::' token. */
6815 /* If we found what we wanted, we keep going; otherwise, we're
6816 done. */
6818 {
6821 /* Restore the OLD_SCOPE since it was valid before the
6822 failed attempt at finding the last
6823 class-or-namespace-name. */
6827 /* If the next token is a decltype, and the one after that is a
6828 `::', then the decltype has failed to resolve to a class or
6829 enumeration type. Give this error even when parsing
6830 tentatively since it can't possibly be valid--and we're going
6831 to replace it with a CPP_NESTED_NAME_SPECIFIER below, so we
6832 won't get another chance.*/
6836 {
6842 dtype);
6845 /* As below. */
6848 }
6852 {
6853 /* If we have a non-type template-id followed by ::, it can't
6854 possibly be valid. */
6859 {
6862 {
6869 else
6872 }
6873 else
6874 {
6880 else
6881 {
6882 /* Variable template. */
6886 }
6887 }
6894 /* As below. */
6898 }
6899 }
6903 /* If the next token is an identifier, and the one after
6904 that is a `::', then any valid interpretation would have
6905 found a class-or-namespace-name. */
6911 {
6914 {
6916 {
6917 tree decl;
6918 tree ambiguous_decls;
6921 none_type,
6930 decl);
6932 {
6933 // cp_parser_lookup_name has the same diagnostic,
6934 // thus make sure to emit it at most once.
6937 {
6942 }
6944 }
6945 else
6946 {
6948 cp_parser_name_lookup_error
6951 else
6952 cp_parser_name_lookup_error
6955 }
6956 }
6959 /* Treat this as a successful nested-name-specifier
6960 due to:
6962 [basic.lookup.qual]
6964 If the name found is not a class-name (clause
6965 _class_) or namespace-name (_namespace.def_), the
6966 program is ill-formed. */
6968 }
6970 }
6972 }
6973 /* We've found one valid nested-name-specifier. */
6975 /* Name lookup always gives us a DECL. */
6978 /* Uses of "template" must be followed by actual templates. */
6981 /* If it is a class scope, try to complete it; we are about to
6982 be looking up names inside the class. */
6984 /* Since checking types for dependency can be expensive,
6985 avoid doing it if the type is already complete. */
6987 /* Do not try to complete dependent types. */
6989 {
6991 /* If it is a typedef to current class, use the current
6992 class instead, as the typedef won't have any names inside
6993 it yet. */
6997 }
6998 /* Make sure we look in the right scope the next time through
6999 the loop. */
7001 }
7003 /* If parsing tentatively, replace the sequence of tokens that makes
7004 up the nested-name-specifier with a CPP_NESTED_NAME_SPECIFIER
7005 token. That way, should we re-parse the token stream, we will
7006 not have to repeat the effort required to do the parse, nor will
7007 we issue duplicate error messages. */
7009 {
7013 /* Reset the contents of the START token. */
7015 /* Retrieve any deferred checks. Do not pop this access checks yet
7016 so the memory will not be reclaimed during token replacing below. */
7025 /* Purge all subsequent tokens. */
7027 }
7033 }
7035 /* Parse a nested-name-specifier. See
7036 cp_parser_nested_name_specifier_opt for details. This function
7037 behaves identically, except that it will an issue an error if no
7038 nested-name-specifier is present. */
7040 static tree
7046 {
7047 tree scope;
7049 /* Look for the nested-name-specifier. */
7051 typename_keyword_p,
7052 check_dependency_p,
7053 type_p,
7054 is_declaration);
7055 /* If it was not present, issue an error message. */
7057 {
7060 }
7063 }
7065 /* Parse the qualifying entity in a nested-name-specifier. For C++98,
7066 this is either a class-name or a namespace-name (which corresponds
7067 to the class-or-namespace-name production in the grammar). For
7068 C++0x, it can also be a type-name that refers to an enumeration
7069 type or a simple-template-id.
7071 TYPENAME_KEYWORD_P is TRUE iff the `typename' keyword is in effect.
7072 TEMPLATE_KEYWORD_P is TRUE iff the `template' keyword is in effect.
7073 CHECK_DEPENDENCY_P is FALSE iff dependent names should be looked up.
7074 TYPE_P is TRUE iff the next name should be taken as a class-name,
7075 even the same name is declared to be another entity in the same
7076 scope.
7078 Returns the class (TYPE_DECL) or namespace (NAMESPACE_DECL)
7079 specified by the class-or-namespace-name. If neither is found the
7080 ERROR_MARK_NODE is returned. */
7082 static tree
7089 {
7090 tree saved_scope;
7091 tree saved_qualifying_scope;
7092 tree saved_object_scope;
7093 tree scope;
7097 /* DR 743: decltype can appear in a nested-name-specifier. */
7099 {
7103 {
7106 }
7110 }
7112 /* Before we try to parse the class-name, we must save away the
7113 current PARSER->SCOPE since cp_parser_class_name will destroy
7114 it. */
7118 /* Try for a class-name first. If the SAVED_SCOPE is a type, then
7119 there is no need to look for a namespace-name. */
7120 only_class_p = template_keyword_p
7125 typename_keyword_p,
7126 template_keyword_p,
7128 check_dependency_p,
7130 is_declaration,
7133 /* If that didn't work, try for a namespace-name. */
7135 {
7136 /* Restore the saved scope. */
7140 /* If we are not looking at an identifier followed by the scope
7141 resolution operator, then this is not part of a
7142 nested-name-specifier. (Note that this function is only used
7143 to parse the components of a nested-name-specifier.) */
7148 }
7151 }
7153 /* Return true if we are looking at a compound-literal, false otherwise. */
7155 static bool
7157 {
7160 /* Skip tokens until the next token is a closing parenthesis.
7161 If we find the closing `)', and the next token is a `{', then
7162 we are looking at a compound-literal. */
7163 bool compound_literal_p
7168 /* Roll back the tokens we skipped. */
7172 }
7174 /* Return true if EXPR is the integer constant zero or a complex constant
7175 of zero, without any folding, but ignoring location wrappers. */
7177 bool
7179 {
7182 }
7184 /* Parse a postfix-expression.
7186 postfix-expression:
7187 primary-expression
7188 postfix-expression [ expression ]
7189 postfix-expression ( expression-list [opt] )
7190 simple-type-specifier ( expression-list [opt] )
7191 typename :: [opt] nested-name-specifier identifier
7192 ( expression-list [opt] )
7193 typename :: [opt] nested-name-specifier template [opt] template-id
7194 ( expression-list [opt] )
7195 postfix-expression . template [opt] id-expression
7196 postfix-expression -> template [opt] id-expression
7197 postfix-expression . pseudo-destructor-name
7198 postfix-expression -> pseudo-destructor-name
7199 postfix-expression ++
7200 postfix-expression --
7201 dynamic_cast < type-id > ( expression )
7202 static_cast < type-id > ( expression )
7203 reinterpret_cast < type-id > ( expression )
7204 const_cast < type-id > ( expression )
7205 typeid ( expression )
7206 typeid ( type-id )
7208 GNU Extension:
7210 postfix-expression:
7211 ( type-id ) { initializer-list , [opt] }
7213 This extension is a GNU version of the C99 compound-literal
7214 construct. (The C99 grammar uses `type-name' instead of `type-id',
7215 but they are essentially the same concept.)
7217 If ADDRESS_P is true, the postfix expression is the operand of the
7218 `&' operator. CAST_P is true if this expression is the target of a
7219 cast.
7221 If MEMBER_ACCESS_ONLY_P, we only allow postfix expressions that are
7222 class member access expressions [expr.ref].
7224 Returns a representation of the expression. */
7226 static cp_expr
7230 {
7232 location_t loc;
7238 /* Peek at the next token. */
7243 /* Some of the productions are determined by keywords. */
7246 {
7251 {
7252 tree type;
7253 cp_expr expression;
7257 /* All of these can be handled in the same way from the point
7258 of view of parsing. Begin by consuming the token
7259 identifying the cast. */
7262 /* New types cannot be defined in the cast. */
7264 parser->type_definition_forbidden_message
7267 /* Look for the opening `<'. */
7269 /* Parse the type to which we are casting. */
7273 NULL);
7275 /* Look for the closing `>'. */
7277 /* Restore the old message. */
7280 bool saved_greater_than_is_operator_p
7284 /* And the expression which is being cast. */
7285 matching_parens parens;
7289 RT_CLOSE_PAREN);
7293 parser->greater_than_is_operator_p
7296 /* Only type conversions to integral or enumeration types
7297 can be used in constant-expressions. */
7300 {
7303 }
7305 /* Construct a location e.g. :
7306 reinterpret_cast <int *> (expr)
7307 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
7308 ranging from the start of the "*_cast" token to the final closing
7309 paren, with the caret at the start. */
7313 {
7315 postfix_expression
7317 tf_warning_or_error);
7320 postfix_expression
7322 tf_warning_or_error);
7325 postfix_expression
7327 tf_warning_or_error);
7330 postfix_expression
7332 tf_warning_or_error);
7336 }
7337 }
7341 {
7342 tree type;
7346 /* Consume the `typeid' token. */
7348 /* Look for the `(' token. */
7349 matching_parens parens;
7351 /* Types cannot be defined in a `typeid' expression. */
7353 parser->type_definition_forbidden_message
7355 /* We can't be sure yet whether we're looking at a type-id or an
7356 expression. */
7358 /* Try a type-id first. */
7363 /* Look for the `)' token. Otherwise, we can't be sure that
7364 we're not looking at an expression: consider `typeid (int
7365 (3))', for example. */
7367 /* If all went well, simply lookup the type-id. */
7370 /* Otherwise, fall back to the expression variant. */
7371 else
7372 {
7373 tree expression;
7375 /* Look for an expression. */
7377 /* Compute its typeid. */
7379 /* Look for the `)' token. */
7381 }
7382 /* Restore the saved message. */
7384 /* `typeid' may not appear in an integral constant expression. */
7388 /* Construct a location e.g. :
7389 typeid (expr)
7390 ^~~~~~~~~~~~~
7391 ranging from the start of the "typeid" token to the final closing
7392 paren, with the caret at the start. */
7394 {
7395 location_t typeid_loc
7399 }
7400 }
7404 {
7405 tree type;
7406 /* The syntax permitted here is the same permitted for an
7407 elaborated-type-specifier. */
7414 }
7422 {
7430 {
7433 }
7439 {
7442 postfix_expression
7444 else
7445 {
7449 }
7455 tf_warning_or_error);
7456 else
7457 {
7461 }
7469 else
7470 {
7474 }
7479 postfix_expression
7483 postfix_expression
7486 else
7487 {
7491 }
7496 {
7500 }
7501 else
7502 {
7503 postfix_expression
7505 }
7510 }
7512 }
7515 {
7516 tree expression;
7517 tree type;
7518 /* Consume the `__builtin_convertvector' token. */
7520 /* Look for the opening `('. */
7521 matching_parens parens;
7523 /* Now, parse the assignment-expression. */
7525 /* Look for the `,'. */
7527 location_t type_location
7529 /* Parse the type-id. */
7530 {
7533 }
7534 /* Look for the closing `)'. */
7536 postfix_expression
7538 tf_warning_or_error);
7540 }
7543 {
7544 tree expression;
7545 tree type;
7546 /* Consume the `__builtin_bit_cast' token. */
7548 /* Look for the opening `('. */
7549 matching_parens parens;
7551 location_t type_location
7553 /* Parse the type-id. */
7554 {
7557 }
7558 /* Look for the `,'. */
7560 /* Now, parse the assignment-expression. */
7562 /* Look for the closing `)'. */
7564 postfix_expression
7566 tf_warning_or_error);
7568 }
7571 {
7572 tree type;
7574 /* If the next thing is a simple-type-specifier, we may be
7575 looking at a functional cast. We could also be looking at
7576 an id-expression. So, we try the functional cast, and if
7577 that doesn't work we fall back to the primary-expression. */
7579 /* Look for the simple-type-specifier. */
7583 CP_PARSER_FLAGS_NONE);
7585 /* Parse the cast itself. */
7587 postfix_expression
7589 /* If that worked, we're done. */
7593 /* If the functional-cast didn't work out, try a
7594 compound-literal. */
7597 {
7602 matching_parens parens;
7605 /* Avoid calling cp_parser_type_id pointlessly, see comment
7606 in cp_parser_cast_expression about c++/29234. */
7609 else
7610 {
7611 /* Parse the type. */
7617 }
7619 /* If things aren't going well, there's no need to
7620 keep going. */
7622 {
7624 /* Parse the brace-enclosed initializer list. */
7627 }
7628 /* If that worked, we're definitely looking at a
7629 compound-literal expression. */
7631 {
7632 /* Warn the user that a compound literal is not
7633 allowed in standard C++. */
7636 /* For simplicity, we disallow compound literals in
7637 constant-expressions. We could
7638 allow compound literals of integer type, whose
7639 initializer was a constant, in constant
7640 expressions. Permitting that usage, as a further
7641 extension, would not change the meaning of any
7642 currently accepted programs. (Of course, as
7643 compound literals are not part of ISO C++, the
7644 standard has nothing to say.) */
7646 NIC_NCC))
7647 {
7650 }
7651 /* Form the representation of the compound-literal. */
7652 postfix_expression
7657 }
7658 }
7660 /* It must be a primary-expression. */
7661 postfix_expression
7664 decltype_p,
7666 }
7668 }
7670 /* Note that we don't need to worry about calling build_cplus_new on a
7671 class-valued CALL_EXPR in decltype when it isn't the end of the
7672 postfix-expression; unary_complex_lvalue will take care of that for
7673 all these cases. */
7675 /* Keep looping until the postfix-expression is complete. */
7677 {
7681 /* It is not a Koenig lookup function call. */
7682 postfix_expression
7685 /* Peek at the next token. */
7689 {
7692 {
7694 "two consecutive %<[%> shall "
7697 }
7698 postfix_expression
7700 postfix_expression,
7702 decltype_p);
7711 /* postfix-expression ( expression-list [opt] ) */
7712 {
7724 tree stripped_expression
7726 is_builtin_constant_p
7729 {
7730 /* The whole point of __builtin_constant_p is to allow
7731 non-constant expressions to appear as arguments. */
7732 saved_integral_constant_expression_p
7734 saved_non_integral_constant_expression_p
7737 }
7738 args = (cp_parser_parenthesized_expression_list
7745 {
7746 parser->integral_constant_expression_p
7748 parser->non_integral_constant_expression_p
7750 }
7753 {
7756 }
7758 /* Function calls are not permitted in
7759 constant-expressions. */
7762 NIC_FUNC_CALL))
7763 {
7767 }
7772 {
7774 /* In C++20, we may need to perform ADL for a template
7775 name. */
7778 {
7780 {
7783 postfix_expression
7785 complain);
7786 }
7787 else
7788 postfix_expression
7790 }
7791 /* We do not perform argument-dependent lookup if
7792 normal lookup finds a non-function, in accordance
7793 with the expected resolution of DR 218. */
7796 {
7797 /* Do not do argument dependent lookup if regular
7798 lookup finds a member function or a block-scope
7799 function declaration. [basic.lookup.argdep]/3 */
7803 {
7809 {
7812 }
7813 }
7816 {
7819 postfix_expression
7821 complain);
7822 }
7823 }
7824 }
7826 /* Temporarily set input_location to the combined location
7827 with call expression range, as e.g. build_out_target_exprs
7828 called from convert_default_arg relies on input_location,
7829 so updating it only when the call is fully built results
7830 in inconsistencies between location handling in templates
7831 and outside of templates. */
7834 close_paren_loc);
7838 {
7848 {
7850 postfix_expression
7852 }
7854 {
7855 postfix_expression
7856 = (build_new_method_call
7862 complain));
7863 }
7864 else
7865 postfix_expression
7869 complain);
7870 }
7874 postfix_expression = (build_offset_ref_call_from_tree
7876 complain));
7878 /* A call to a static class member, or a namespace-scope
7879 function. */
7880 postfix_expression
7883 koenig_p,
7884 complain);
7885 else
7886 /* All other function calls. */
7887 postfix_expression
7890 koenig_p,
7891 complain);
7896 /* The POSTFIX_EXPRESSION is certainly no longer an id. */
7900 }
7905 /* postfix-expression . template [opt] id-expression
7906 postfix-expression . pseudo-destructor-name
7907 postfix-expression -> template [opt] id-expression
7908 postfix-expression -> pseudo-destructor-name */
7910 /* Consume the `.' or `->' operator. */
7913 postfix_expression
7915 postfix_expression,
7922 /* postfix-expression ++ */
7923 /* Consume the `++' token. */
7925 /* Generate a representation for the complete expression. */
7926 postfix_expression
7928 POSTINCREMENT_EXPR);
7929 /* Increments may not appear in constant-expressions. */
7937 /* postfix-expression -- */
7938 /* Consume the `--' token. */
7940 /* Generate a representation for the complete expression. */
7941 postfix_expression
7943 POSTDECREMENT_EXPR);
7944 /* Decrements may not appear in constant-expressions. */
7955 return is_member_access
7956 ? postfix_expression
7958 else
7960 }
7961 }
7962 }
7964 /* Helper function for cp_parser_parenthesized_expression_list and
7965 cp_parser_postfix_open_square_expression. Parse a single element
7966 of parenthesized expression list. */
7968 static cp_expr
7972 {
7976 /* Parse the next assignment-expression. */
7978 {
7979 /* A braced-init-list. */
7985 }
7987 {
7993 }
7994 else
7997 /* If we have an ellipsis, then this is an expression expansion. */
8000 {
8001 /* Consume the `...'. */
8004 /* Build the argument pack. */
8006 }
8008 }
8010 /* A subroutine of cp_parser_postfix_expression that also gets hijacked
8011 by cp_parser_builtin_offsetof. We're looking for
8013 postfix-expression [ expression ]
8014 postfix-expression [ braced-init-list ] (C++11)
8015 postfix-expression [ expression-list[opt] ] (C++23)
8017 FOR_OFFSETOF is set if we're being called in that context, which
8018 changes how we deal with integer constant expressions. */
8020 static tree
8022 tree postfix_expression,
8025 {
8031 /* Consume the `[' token. */
8037 /* Parse the index expression. */
8038 /* ??? For offsetof, there is a question of what to allow here. If
8039 offsetof is not being used in an integral constant expression context,
8040 then we *could* get the right answer by computing the value at runtime.
8041 If we are in an integral constant expression context, then we might
8042 could accept any constant expression; hard to say without analysis.
8043 Rather than open the barn door too wide right away, allow only integer
8044 constant expressions here. */
8047 else
8048 {
8053 {
8055 {
8056 cp_expr expr
8058 /*cast_p=*/
8060 /*allow_exp_p=*/
8062 /*non_cst_p=*/
8063 NULL);
8070 else
8073 /* If the next token isn't a `,', then we are done. */
8078 {
8081 }
8083 /* Otherwise, consume the `,' and keep going. */
8085 }
8088 }
8090 {
8095 }
8096 else
8100 }
8104 /* Look for the closing `]'. */
8107 /* Build the ARRAY_REF. */
8110 tf_warning_or_error
8113 /* When not doing offsetof, array references are not permitted in
8114 constant-expressions. */
8120 }
8122 /* A subroutine of cp_parser_postfix_dot_deref_expression. Handle dot
8123 dereference of incomplete type, returns true if error_mark_node should
8124 be returned from caller, otherwise adjusts *SCOPE, *POSTFIX_EXPRESSION
8125 and *DEPENDENT_P. */
8127 bool
8130 {
8131 /* In a template, be permissive by treating an object expression
8132 of incomplete type as dependent (after a pedwarn). */
8133 diagnostic_t kind = (processing_template_decl
8137 {
8149 /* Don't emit any diagnostic for OVERLOADs. */
8153 /* Avoid clobbering e.g. DECLs. */
8157 }
8169 {
8172 }
8174 }
8176 /* A subroutine of cp_parser_postfix_expression that also gets hijacked
8177 by cp_parser_builtin_offsetof. We're looking for
8179 postfix-expression . template [opt] id-expression
8180 postfix-expression . pseudo-destructor-name
8181 postfix-expression -> template [opt] id-expression
8182 postfix-expression -> pseudo-destructor-name
8184 FOR_OFFSETOF is set if we're being called in that context. That sorta
8185 limits what of the above we'll actually accept, but nevermind.
8186 TOKEN_TYPE is the "." or "->" token, which will already have been
8187 removed from the stream. */
8189 static tree
8192 cp_expr postfix_expression,
8194 location_t location)
8195 {
8196 tree name;
8202 /* If this is a `->' operator, dereference the pointer. */
8205 tf_warning_or_error);
8206 /* Check to see whether or not the expression is type-dependent and
8207 not the current instantiation. */
8209 /* The identifier following the `->' or `.' is not qualified. */
8215 /* Enter the scope corresponding to the type of the object
8216 given by the POSTFIX_EXPRESSION. */
8218 {
8220 /* According to the standard, no expression should ever have
8221 reference type. Unfortunately, we do not currently match
8222 the standard in this respect in that our internal representation
8223 of an expression may have reference type even when the standard
8224 says it does not. Therefore, we have to manually obtain the
8225 underlying type here. */
8227 /* The type of the POSTFIX_EXPRESSION must be complete. */
8228 /* Unlike the object expression in other contexts, *this is not
8229 required to be of complete type for purposes of class member
8230 access (5.2.5) outside the member function body. */
8234 {
8240 }
8243 {
8244 /* Let the name lookup machinery know that we are processing a
8245 class member access expression. */
8247 /* If something went wrong, we want to be able to discern that case,
8248 as opposed to the case where there was no SCOPE due to the type
8249 of expression being dependent. */
8252 /* If the SCOPE was erroneous, make the various semantic analysis
8253 functions exit quickly -- and without issuing additional error
8254 messages. */
8257 }
8258 }
8261 {
8263 /* If we don't have a (type-dependent) object of class type, use
8264 typeof to figure out the type of the object. */
8268 }
8270 /* Assume this expression is not a pseudo-destructor access. */
8273 /* If the SCOPE is a scalar type, then, if this is a valid program,
8274 we must be looking at a pseudo-destructor-name. If POSTFIX_EXPRESSION
8275 is type dependent, it can be pseudo-destructor-name or something else.
8276 Try to parse it as pseudo-destructor-name first. */
8278 {
8279 tree s;
8280 tree type;
8283 /* Parse the pseudo-destructor-name. */
8292 {
8294 postfix_expression
8297 }
8298 }
8301 {
8302 /* If the SCOPE is not a scalar type, we are looking at an
8303 ordinary class member access expression, rather than a
8304 pseudo-destructor-name. */
8307 /* Parse the id-expression. */
8308 name = (cp_parser_id_expression
8315 /* In general, build a SCOPE_REF if the member name is qualified.
8316 However, if the name was not dependent and has already been
8317 resolved; there is no need to build the SCOPE_REF. For example;
8319 struct X { void f(); };
8320 template <typename T> void f(T* t) { t->X::f(); }
8322 Even though "t" is dependent, "X::f" is not and has been resolved
8323 to a BASELINK; there is no need to include scope information. */
8325 /* But we do need to remember that there was an explicit scope for
8326 virtual function calls. */
8330 /* If the name is a template-id that names a type, we will get a
8331 TYPE_DECL here. That is invalid code. */
8333 {
8336 }
8337 else
8338 {
8340 {
8342 {
8346 }
8347 else
8350 name,
8351 template_p);
8355 }
8357 adjust_result_of_qualified_name_lookup
8359 postfix_expression
8361 template_p,
8362 tf_warning_or_error);
8363 /* Build a location e.g.:
8364 ptr->access_expr
8365 ~~~^~~~~~~~~~~~~
8366 where the caret is at the deref token, ranging from
8367 the start of postfix_expression to the end of the access expr. */
8368 location_t combined_loc
8371 }
8372 }
8374 /* We no longer need to look up names in the scope of the object on
8375 the left-hand side of the `.' or `->' operator. */
8378 /* Outside of offsetof, these operators may not appear in
8379 constant-expressions. */
8381 && (cp_parser_non_integral_constant_expression
8386 }
8388 /* Parse a parenthesized expression-list.
8390 expression-list:
8391 assignment-expression
8392 expression-list, assignment-expression
8394 attribute-list:
8395 expression-list
8396 identifier
8397 identifier, expression-list
8399 CAST_P is true if this expression is the target of a cast.
8401 ALLOW_EXPANSION_P is true if this expression allows expansion of an
8402 argument pack.
8404 WRAP_LOCATIONS_P is true if expressions within this list for which
8405 CAN_HAVE_LOCATION_P is false should be wrapped with nodes expressing
8406 their source locations.
8408 Returns a vector of trees. Each element is a representation of an
8409 assignment-expression. NULL is returned if the ( and or ) are
8410 missing. An empty, but allocated, vector is returned on no
8411 expressions. The parentheses are eaten. IS_ATTRIBUTE_LIST is id_attr
8412 if we are parsing an attribute list for an attribute that wants a
8413 plain identifier argument, normal_attr for an attribute that wants
8414 an expression, or non_attr if we aren't parsing an attribute list. If
8415 NON_CONSTANT_P is non-NULL, *NON_CONSTANT_P indicates whether or
8416 not all of the expressions in the list were constant.
8417 If CLOSE_PAREN_LOC is non-NULL, and no errors occur, then *CLOSE_PAREN_LOC
8418 will be written to with the location of the closing parenthesis. If
8419 an error occurs, it may or may not be written to. */
8429 {
8434 /* Assume all the expressions will be constant. */
8438 matching_parens parens;
8444 /* Within a parenthesized expression, a `>' token is always
8445 the greater-than operator. */
8446 saved_greater_than_is_operator_p
8452 /* Consume expressions until there are no more. */
8455 {
8456 /* At the beginning of attribute lists, check to see if the
8457 next token is an identifier. */
8460 {
8463 /* Consume the identifier. */
8465 /* Save the identifier. */
8467 }
8468 else
8469 {
8470 expr
8472 allow_expansion_p,
8473 non_constant_p);
8478 /* Add it to the list. We add error_mark_node
8479 expressions to the list, so that we can still tell if
8480 the correct form for a parenthesized expression-list
8481 is found. That gives better errors. */
8486 }
8488 /* After the first item, attribute lists look the same as
8489 expression lists. */
8492 get_comma:;
8493 /* If the next token isn't a `,', then we are done. */
8497 /* Otherwise, consume the `,' and keep going. */
8499 }
8505 {
8508 skip_comma:;
8509 /* We try and resync to an unnested comma, as that will give the
8510 user better diagnostics. */
8518 {
8519 parser->greater_than_is_operator_p
8522 }
8523 }
8525 parser->greater_than_is_operator_p
8532 }
8534 /* Parse a pseudo-destructor-name.
8536 pseudo-destructor-name:
8537 :: [opt] nested-name-specifier [opt] type-name :: ~ type-name
8538 :: [opt] nested-name-specifier template template-id :: ~ type-name
8539 :: [opt] nested-name-specifier [opt] ~ type-name
8541 If either of the first two productions is used, sets *SCOPE to the
8542 TYPE specified before the final `::'. Otherwise, *SCOPE is set to
8543 NULL_TREE. *TYPE is set to the TYPE_DECL for the final type-name,
8544 or ERROR_MARK_NODE if the parse fails. */
8546 static void
8548 tree object,
8551 {
8554 /* Handle ~auto. */
8558 {
8561 "%<~auto%> only available with "
8568 }
8570 /* Assume that things will not work out. */
8573 /* Look for the optional `::' operator. */
8575 /* Look for the optional nested-name-specifier. */
8576 nested_name_specifier_p
8583 /* Now, if we saw a nested-name-specifier, we might be doing the
8584 second production. */
8587 {
8588 /* Consume the `template' keyword. */
8590 /* Parse the template-id. */
8594 class_type,
8596 /* Look for the `::' token. */
8598 }
8599 /* If the next token is not a `~', then there might be some
8600 additional qualification. */
8602 {
8603 /* At this point, we're looking for "type-name :: ~". The type-name
8604 must not be a class-name, since this is a pseudo-destructor. So,
8605 it must be either an enum-name, or a typedef-name -- both of which
8606 are just identifiers. So, we peek ahead to check that the "::"
8607 and "~" tokens are present; if they are not, then we can avoid
8608 calling type_name. */
8612 {
8615 }
8617 /* Look for the type-name. */
8622 /* Look for the `::' token. */
8624 }
8625 else
8628 /* Look for the `~'. */
8631 /* Once we see the ~, this has to be a pseudo-destructor. */
8635 /* Look for the type-name again. We are not responsible for
8636 checking that it matches the first type-name. */
8638 }
8640 /* Parse a unary-expression.
8642 unary-expression:
8643 postfix-expression
8644 ++ cast-expression
8645 -- cast-expression
8646 await-expression
8647 unary-operator cast-expression
8648 sizeof unary-expression
8649 sizeof ( type-id )
8650 alignof ( type-id ) [C++0x]
8651 new-expression
8652 delete-expression
8654 GNU Extensions:
8656 unary-expression:
8657 __extension__ cast-expression
8658 __alignof__ unary-expression
8659 __alignof__ ( type-id )
8660 alignof unary-expression [C++0x]
8661 __real__ cast-expression
8662 __imag__ cast-expression
8663 && identifier
8664 sizeof ( type-id ) { initializer-list , [opt] }
8665 alignof ( type-id ) { initializer-list , [opt] } [C++0x]
8666 __alignof__ ( type-id ) { initializer-list , [opt] }
8668 ADDRESS_P is true iff the unary-expression is appearing as the
8669 operand of the `&' operator. CAST_P is true if this expression is
8670 the target of a cast.
8672 Returns a representation of the expression. */
8674 static cp_expr
8677 {
8681 /* Peek at the next token. */
8683 /* Some keywords give away the kind of expression. */
8685 {
8689 {
8692 {
8700 /* Consume the token. */
8702 /* Parse the operand. */
8705 /* Construct a location e.g. :
8706 alignof (expr)
8707 ^~~~~~~~~~~~~~
8708 with start == caret at the start of the "alignof"/"sizeof"
8709 token, with the endpoint at the final closing paren. */
8710 location_t compound_loc
8716 else
8717 {
8718 /* ISO C++ defines alignof only with types, not with
8719 expressions. So pedwarn if alignof is used with a non-
8720 type expression. However, __alignof__ is ok. */
8723 "ISO C++ does not allow %<alignof%> "
8728 }
8729 /* For SIZEOF_EXPR, just issue diagnostics, but keep
8730 SIZEOF_EXPR with the original operand. */
8732 {
8734 {
8736 {
8739 error_mark_node));
8741 }
8742 else
8747 }
8748 }
8753 }
8765 {
8766 /* The saved value of the PEDANTIC flag. */
8768 tree expr;
8770 /* Save away the PEDANTIC flag. */
8772 /* Parse the cast-expression. */
8774 /* Restore the PEDANTIC flag. */
8778 }
8782 {
8783 tree expression;
8785 /* Consume the `__real__' or `__imag__' token. */
8787 /* Parse the cast-expression. */
8789 /* Create the complete representation. */
8794 tf_warning_or_error);
8795 }
8803 {
8804 tree expr;
8813 matching_parens parens;
8817 parser->type_definition_forbidden_message
8820 saved_integral_constant_expression_p
8822 saved_non_integral_constant_expression_p
8826 saved_greater_than_is_operator_p
8838 parser->greater_than_is_operator_p
8841 parser->integral_constant_expression_p
8843 parser->non_integral_constant_expression_p
8850 /* Construct a location of the form:
8851 noexcept (expr)
8852 ^~~~~~~~~~~~~~~
8853 with start == caret, finishing at the close-paren. */
8854 location_t noexcept_loc
8858 noexcept_loc);
8859 }
8862 {
8863 tree expr;
8866 /* Consume the `co_await' token. */
8868 /* Parse its cast-expression. */
8873 /* Handle [expr.await]. */
8875 }
8879 }
8880 }
8882 /* Look for the `:: new' and `:: delete', which also signal the
8883 beginning of a new-expression, or delete-expression,
8884 respectively. If the next token is `::', then it might be one of
8885 these. */
8887 {
8890 /* See if the token after the `::' is one of the keywords in
8891 which we're interested. */
8893 /* If it's `new', we have a new-expression. */
8896 /* Similarly, for `delete'. */
8899 }
8901 /* Look for a unary operator. */
8903 /* The `++' and `--' operators can be handled similarly, even though
8904 they are not technically unary-operators in the grammar. */
8906 {
8911 /* Handle the GNU address-of-label extension. */
8914 {
8915 tree identifier;
8916 tree expression;
8919 /* Consume the '&&' token. */
8921 /* Look for the identifier. */
8923 /* Construct a location of the form:
8924 &&label
8925 ^~~~~~~
8926 with caret==start at the "&&", finish at the end of the label. */
8927 location_t combined_loc
8929 /* Create an expression representing the address. */
8932 NIC_ADDR_LABEL))
8935 }
8936 }
8938 {
8939 cp_expr cast_expression;
8945 /* Consume the operator token. */
8949 /* Parse the cast-expression. */
8950 cast_expression
8955 pidk);
8957 /* Make a location:
8958 OP_TOKEN CAST_EXPRESSION
8959 ^~~~~~~~~~~~~~~~~~~~~~~~~
8960 with start==caret at the operator token, and
8961 extending to the end of the cast_expression. */
8964 /* Now, build an appropriate representation. */
8966 {
8971 complain);
8972 /* TODO: build_x_indirect_ref does not always honor the
8973 location, so ensure it is set. */
8979 /* Fall through. */
8982 cast_expression,
8984 /* TODO: build_x_unary_op does not always honor the location,
8985 so ensure it is set. */
8993 /* Fall through. */
8995 /* Immediately fold negation of a constant, unless the constant is 0
8996 (since -0 == 0) or it would overflow. */
8998 {
8999 tree stripped_expr
9004 {
9007 stripped_expr);
9009 {
9012 }
9013 }
9014 }
9015 /* Fall through. */
9024 }
9028 non_constant_p))
9032 }
9036 decltype_p,
9037 pidk);
9038 }
9040 /* Returns ERROR_MARK if TOKEN is not a unary-operator. If TOKEN is a
9041 unary-operator, the corresponding tree code is returned. */
9043 static enum tree_code
9045 {
9047 {
9068 }
9069 }
9071 /* Parse a __builtin_has_attribute([expr|type], attribute-spec) expression.
9072 Returns a representation of the expression. */
9074 static tree
9076 {
9079 /* Consume the __builtin_has_attribute token. */
9082 matching_parens parens;
9086 /* Types cannot be defined in a `sizeof' expression. Save away the
9087 old message. */
9091 parser->type_definition_forbidden_message
9093 parser->type_definition_forbidden_message_arg
9096 /* The restrictions on constant-expressions do not apply inside
9097 sizeof expressions. */
9098 bool saved_integral_constant_expression_p
9100 bool saved_non_integral_constant_expression_p
9104 /* Do not actually evaluate the expression. */
9110 /* We can't be sure yet whether we're looking at a type-id or an
9111 expression. */
9116 /* Look for the type-id. */
9122 /* If the type-id production did not work out, then we must be
9123 looking at an expression. */
9129 /* Go back to evaluating expressions. */
9133 /* And restore the old one. */
9136 parser->integral_constant_expression_p
9138 parser->non_integral_constant_expression_p
9141 /* Consume the comma if it's there. */
9143 {
9147 }
9149 /* Parse the attribute specification. */
9153 {
9159 else
9160 {
9161 /* Fold constant expressions used in attributes first. */
9164 /* Finally, see if OPER has been declared with ATTR. */
9166 }
9169 }
9170 else
9171 {
9174 }
9176 /* Construct a location e.g. :
9177 __builtin_has_attribute (oper, attr)
9178 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9179 with start == caret at the start of the built-in token,
9180 and with the endpoint at the final closing paren. */
9181 location_t compound_loc
9188 }
9190 /* Parse a new-expression.
9192 new-expression:
9193 :: [opt] new new-placement [opt] new-type-id new-initializer [opt]
9194 :: [opt] new new-placement [opt] ( type-id ) new-initializer [opt]
9196 Returns a representation of the expression. */
9198 static tree
9200 {
9203 tree type;
9206 tree ret;
9210 /* Look for the optional `::' operator. */
9211 global_scope_p
9215 /* Look for the `new' operator. */
9217 /* There's no easy way to tell a new-placement from the
9218 `( type-id )' construct. */
9220 /* Look for a new-placement. */
9222 /* If that didn't work out, there's no new-placement. */
9224 {
9228 }
9230 /* If the next token is a `(', then we have a parenthesized
9231 type-id. */
9233 {
9237 /* Consume the `('. */
9238 matching_parens parens;
9241 /* Parse the type-id. */
9242 parser->type_definition_forbidden_message
9244 {
9247 }
9250 /* Look for the closing `)'. */
9253 /* There should not be a direct-new-declarator in this production,
9254 but GCC used to allowed this, so we check and emit a sensible error
9255 message for this case. */
9257 {
9263 }
9264 }
9265 /* Otherwise, there must be a new-type-id. */
9266 else
9269 /* If the next token is a `(' or '{', then we have a new-initializer. */
9274 else
9277 /* A new-expression may not appear in an integral constant
9278 expression. */
9281 /* 5.3.4/2: "If the auto type-specifier appears in the type-specifier-seq
9282 of a new-type-id or type-id of a new-expression, the new-expression shall
9283 contain a new-initializer of the form ( assignment-expression )".
9284 Additionally, consistently with the spirit of DR 1467, we want to accept
9285 'new auto { 2 }' too. */
9291 {
9293 "initialization of new-expression for type %<auto%> "
9296 }
9297 else
9298 {
9299 /* Construct a location e.g.:
9300 ptr = new int[100]
9301 ^~~~~~~~~~~~
9302 with caret == start at the start of the "new" token, and the end
9303 at the end of the final token we consumed. */
9306 /* Create a representation of the new-expression. */
9309 }
9317 }
9319 /* Parse a new-placement.
9321 new-placement:
9322 ( expression-list )
9324 Returns the same representation as for an expression-list. */
9328 {
9331 /* Parse the expression-list. */
9332 expression_list = (cp_parser_parenthesized_expression_list
9341 }
9343 /* Parse a new-type-id.
9345 new-type-id:
9346 type-specifier-seq new-declarator [opt]
9348 Returns the TYPE allocated. If the new-type-id indicates an array
9349 type, *NELTS is set to the number of elements in the last array
9350 bound; the TYPE will not include the last array bound. */
9352 static tree
9354 {
9355 cp_decl_specifier_seq type_specifier_seq;
9361 /* The type-specifier sequence must not contain type definitions.
9362 (It cannot contain declarations of new types either, but if they
9363 are not definitions we will catch that because they are not
9364 complete.) */
9366 parser->type_definition_forbidden_message
9368 /* Parse the type-specifier-seq. */
9373 /* Restore the old message. */
9379 /* Parse the new-declarator. */
9382 /* Determine the number of elements in the last array dimension, if
9383 any. */
9385 /* Skip down to the last array dimension. */
9390 {
9393 }
9398 {
9401 }
9404 {
9413 else
9415 }
9418 }
9420 /* Parse an (optional) new-declarator.
9422 new-declarator:
9423 ptr-operator new-declarator [opt]
9424 direct-new-declarator
9426 Returns the declarator. */
9430 {
9433 cp_cv_quals cv_quals;
9435 /* We don't know if there's a ptr-operator next, or not. */
9437 /* Look for a ptr-operator. */
9439 /* If that worked, look for more new-declarators. */
9441 {
9444 /* Parse another optional declarator. */
9447 declarator = cp_parser_make_indirect_declarator
9451 }
9453 /* If the next token is a `[', there is a direct-new-declarator. */
9458 }
9460 /* Parse a direct-new-declarator.
9462 direct-new-declarator:
9463 [ expression ]
9464 direct-new-declarator [constant-expression]
9466 */
9470 {
9475 {
9476 tree expression;
9479 /* Look for the opening `['. */
9485 else
9487 /* The standard requires that the expression have integral
9488 type. DR 74 adds enumeration types. We believe that the
9489 real intent is that these expressions be handled like the
9490 expression in a `switch' condition, which also allows
9491 classes with a single conversion to integral or
9492 enumeration type. */
9494 {
9495 expression
9497 expression,
9500 {
9502 "expression in new-declarator must have integral "
9505 }
9506 }
9508 /* Look for the closing `]'. */
9511 /* Add this bound to the declarator. */
9514 /* If the next token is not a `[', then there are no more
9515 bounds. */
9519 }
9522 }
9524 /* Parse a new-initializer.
9526 new-initializer:
9527 ( expression-list [opt] )
9528 braced-init-list
9530 Returns a representation of the expression-list. */
9534 {
9538 {
9539 tree t;
9546 }
9547 else
9548 expression_list = (cp_parser_parenthesized_expression_list
9554 }
9556 /* Parse a delete-expression.
9558 delete-expression:
9559 :: [opt] delete cast-expression
9560 :: [opt] delete [ ] cast-expression
9562 Returns a representation of the expression. */
9564 static tree
9566 {
9569 tree expression;
9572 /* Look for the optional `::' operator. */
9573 global_scope_p
9577 /* Look for the `delete' keyword. */
9579 /* See if the array syntax is in use. */
9581 {
9582 /* Consume the `[' token. */
9584 /* Look for the `]' token. */
9586 /* Remember that this is the `[]' construct. */
9588 }
9589 else
9592 /* Parse the cast-expression. */
9595 /* A delete-expression may not appear in an integral constant
9596 expression. */
9600 /* Construct a location e.g.:
9601 delete [ ] ptr
9602 ^~~~~~~~~~~~~~
9603 with caret == start at the start of the "delete" token, and
9604 the end at the end of the final token we consumed. */
9611 }
9613 /* Returns 1 if TOKEN may start a cast-expression and isn't '++', '--',
9614 neither '[' in C++11; -1 if TOKEN is '++', '--', or '[' in C++11;
9615 0 otherwise. */
9617 static int
9619 {
9622 {
9664 /* In ((type ()) () the last () isn't a valid cast-expression,
9665 so the whole must be parsed as postfix-expression. */
9670 /* '[' may start a primary-expression in obj-c++ and in C++11,
9671 as a lambda-expression, eg, '(void)[]{}'. */
9678 /* '++' and '--' may or may not start a cast-expression:
9680 struct T { void operator++(int); };
9681 void f() { (T())++; }
9683 vs
9685 int a;
9686 (int)++a; */
9691 }
9692 }
9694 /* Try to find a legal C++-style cast to DST_TYPE for ORIG_EXPR, trying them
9695 in the order: const_cast, static_cast, reinterpret_cast.
9697 Don't suggest dynamic_cast.
9699 Return the first legal cast kind found, or NULL otherwise. */
9703 {
9704 tree trial;
9706 /* Reuse the parser logic by attempting to build the various kinds of
9707 cast, with "complain" disabled.
9708 Identify the first such cast that is valid. */
9710 /* Don't attempt to run such logic within template processing. */
9714 /* First try const_cast. */
9719 /* If that fails, try static_cast. */
9724 /* Finally, try reinterpret_cast. */
9726 tf_none);
9730 /* No such cast possible. */
9732 }
9734 /* If -Wold-style-cast is enabled, add fix-its to RICHLOC,
9735 suggesting how to convert a C-style cast of the form:
9737 (DST_TYPE)ORIG_EXPR
9739 to a C++-style cast.
9741 The primary range of RICHLOC is asssumed to be that of the original
9742 expression. OPEN_PAREN_LOC and CLOSE_PAREN_LOC give the locations
9743 of the parens in the C-style cast. */
9745 static void
9748 tree dst_type)
9749 {
9750 /* This function is non-trivial, so bail out now if the warning isn't
9751 going to be emitted. */
9755 /* Try to find a legal C++ cast, trying them in order:
9756 const_cast, static_cast, reinterpret_cast. */
9761 /* Replace the open paren with "CAST_SUGGESTION<". */
9762 pretty_printer pp;
9767 /* Replace the close paren with "> (". */
9770 /* Add a closing paren after the expr (the primary range of RICH_LOC). */
9772 }
9775 /* Parse a cast-expression.
9777 cast-expression:
9778 unary-expression
9779 ( type-id ) cast-expression
9781 ADDRESS_P is true iff the unary-expression is appearing as the
9782 operand of the `&' operator. CAST_P is true if this expression is
9783 the target of a cast.
9785 Returns a representation of the expression. */
9787 static cp_expr
9790 {
9791 /* If it's a `(', then we might be looking at a cast. */
9793 {
9799 /* There's no way to know yet whether or not this is a cast.
9800 For example, `(int (3))' is a unary-expression, while `(int)
9801 3' is a cast. So, we resort to parsing tentatively. */
9803 /* Types may not be defined in a cast. */
9805 parser->type_definition_forbidden_message
9807 /* Consume the `('. */
9808 matching_parens parens;
9813 /* A very tricky bit is that `(struct S) { 3 }' is a
9814 compound-literal (which we permit in C++ as an extension).
9815 But, that construct is not a cast-expression -- it is a
9816 postfix-expression. (The reason is that `(struct S) { 3 }.i'
9817 is legal; if the compound-literal were a cast-expression,
9818 you'd need an extra set of parentheses.) But, if we parse
9819 the type-id, and it happens to be a class-specifier, then we
9820 will commit to the parse at that point, because we cannot
9821 undo the action that is done when creating a new class. So,
9822 then we cannot back up and do a postfix-expression.
9824 Another tricky case is the following (c++/29234):
9826 struct S { void operator () (); };
9828 void foo ()
9829 {
9830 ( S()() );
9831 }
9833 As a type-id we parse the parenthesized S()() as a function
9834 returning a function, groktypename complains and we cannot
9835 back up in this case either.
9837 Therefore, we scan ahead to the closing `)', and check to see
9838 if the tokens after the `)' can start a cast-expression. Otherwise
9839 we are dealing with an unary-expression, a postfix-expression
9840 or something else.
9842 Yet another tricky case, in C++11, is the following (c++/54891):
9844 (void)[]{};
9846 The issue is that usually, besides the case of lambda-expressions,
9847 the parenthesized type-id cannot be followed by '[', and, eg, we
9848 want to parse '(C ())[2];' in parse/pr26997.C as unary-expression.
9849 Thus, if cp_parser_tokens_start_cast_expression returns -1, below
9850 we don't commit, we try a cast-expression, then an unary-expression.
9852 Save tokens so that we can put them back. */
9855 /* We may be looking at a cast-expression. */
9858 cast_expression
9861 /* Roll back the tokens we skipped. */
9863 /* If we aren't looking at a cast-expression, simulate an error so
9864 that the call to cp_parser_error_occurred below returns true. */
9867 else
9868 {
9871 /* Look for the type-id. */
9873 /* Look for the closing `)'. */
9878 }
9880 /* Restore the saved message. */
9883 /* At this point this can only be either a cast or a
9884 parenthesized ctor such as `(T ())' that looks like a cast to
9885 function returning T. */
9887 {
9888 /* Only commit if the cast-expression doesn't start with
9889 '++', '--', or '[' in C++11. */
9897 pidk);
9900 {
9901 /* Warn about old-style casts, if so requested. */
9906 {
9912 }
9914 /* Only type conversions to integral or enumeration types
9915 can be used in constant-expressions. */
9918 NIC_CAST))
9921 /* Perform the cast. */
9922 /* Make a location:
9923 (TYPE) EXPR
9924 ^~~~~~~~~~~
9925 with start==caret at the open paren, extending to the
9926 end of "expr". */
9928 open_paren_loc,
9932 }
9933 }
9934 else
9936 }
9938 /* If we get here, then it's not a cast, so it must be a
9939 unary-expression. */
9942 }
9944 /* Parse a binary expression of the general form:
9946 pm-expression:
9947 cast-expression
9948 pm-expression .* cast-expression
9949 pm-expression ->* cast-expression
9951 multiplicative-expression:
9952 pm-expression
9953 multiplicative-expression * pm-expression
9954 multiplicative-expression / pm-expression
9955 multiplicative-expression % pm-expression
9957 additive-expression:
9958 multiplicative-expression
9959 additive-expression + multiplicative-expression
9960 additive-expression - multiplicative-expression
9962 shift-expression:
9963 additive-expression
9964 shift-expression << additive-expression
9965 shift-expression >> additive-expression
9967 relational-expression:
9968 shift-expression
9969 relational-expression < shift-expression
9970 relational-expression > shift-expression
9971 relational-expression <= shift-expression
9972 relational-expression >= shift-expression
9974 GNU Extension:
9976 relational-expression:
9977 relational-expression <? shift-expression
9978 relational-expression >? shift-expression
9980 equality-expression:
9981 relational-expression
9982 equality-expression == relational-expression
9983 equality-expression != relational-expression
9985 and-expression:
9986 equality-expression
9987 and-expression & equality-expression
9989 exclusive-or-expression:
9990 and-expression
9991 exclusive-or-expression ^ and-expression
9993 inclusive-or-expression:
9994 exclusive-or-expression
9995 inclusive-or-expression | exclusive-or-expression
9997 logical-and-expression:
9998 inclusive-or-expression
9999 logical-and-expression && inclusive-or-expression
10001 logical-or-expression:
10002 logical-and-expression
10003 logical-or-expression || logical-and-expression
10005 All these are implemented with a single function like:
10007 binary-expression:
10008 simple-cast-expression
10009 binary-expression <token> binary-expression
10011 CAST_P is true if this expression is the target of a cast.
10013 The binops_by_token map is used to get the tree codes for each <token> type.
10014 binary-expressions are associated according to a precedence table. */
10016 #define TOKEN_PRECEDENCE(token) \
10017 (((token->type == CPP_GREATER \
10018 || ((cxx_dialect != cxx98) && token->type == CPP_RSHIFT)) \
10019 && !parser->greater_than_is_operator_p) \
10020 ? PREC_NOT_OPERATOR \
10021 : binops_by_token[token->type].prec)
10023 static cp_expr
10029 {
10030 cp_parser_expression_stack stack;
10033 cp_parser_expression_stack_entry current;
10034 cp_expr rhs;
10038 tree overload;
10040 /* Parse the first expression. */
10051 {
10052 /* Get an operator token. */
10058 {
10060 "%<>>%> operator is treated"
10064 }
10069 /* This is a fold-expression; handle it later. */
10072 /* Popping an entry off the stack means we completed a subexpression:
10073 - either we found a token which is not an operator (`>' where it is not
10074 an operator, or prec == PREC_NOT_OPERATOR), in which case popping
10075 will happen repeatedly;
10076 - or, we found an operator which has lower priority. This is the case
10077 where the recursive descent *ascends*, as in `3 * 4 + 5' after
10078 parsing `3 * 4'. */
10080 {
10083 else
10085 }
10087 get_rhs:
10091 /* We used the operator token. */
10094 /* For "false && x" or "true || x", x will never be executed;
10095 disable warnings while evaluating it. */
10100 {
10103 }
10105 /* Extract another operand. It may be the RHS of this expression
10106 or the LHS of a new, higher priority expression. */
10111 /* Get another operator token. Look up its precedence to avoid
10112 building a useless (immediately popped) stack entry for common
10113 cases such as 3 + 4 + 5 or 3 * 4 + 5. */
10120 {
10121 /* ... and prepare to parse the RHS of the new, higher priority
10122 expression. Since precedence levels on the stack are
10123 monotonically increasing, we do not have to care about
10124 stack overflows. */
10133 pop:
10135 /* If the stack is not empty, we have parsed into LHS the right side
10136 (`4' in the example above) of an expression we had suspended.
10137 We can use the information on the stack to recover the LHS (`3')
10138 from the stack together with the tree code (`MULT_EXPR'), and
10139 the precedence of the higher level subexpression
10140 (`PREC_ADDITIVE_EXPRESSION'). TOKEN is the CPP_PLUS token,
10141 which will be used to actually build the additive expression. */
10146 }
10148 /* Undo the disabling of warnings done above. */
10150 {
10153 }
10158 /* Avoid warning for !!x == y. */
10163 /* Avoid warning for !b == y where b is boolean. */
10167 /* Avoid warning for !!b == y where b is boolean. */
10180 /* ??? Currently we pass lhs_type == ERROR_MARK and rhs_type ==
10181 ERROR_MARK for everything that is not a binary expression.
10182 This makes warn_about_parentheses miss some warnings that
10183 involve unary operators. For unary expressions we should
10184 pass the correct tree_code unless the unary expression was
10185 surrounded by parentheses.
10186 */
10190 {
10193 else
10194 {
10197 current.lhs
10200 == tcc_comparison
10204 }
10205 }
10206 else
10207 {
10213 /* TODO: build_x_binary_op doesn't always honor the location. */
10215 }
10218 /* If the binary operator required the use of an overloaded operator,
10219 then this expression cannot be an integral constant-expression.
10220 An overloaded operator can be used even if both operands are
10221 otherwise permissible in an integral constant-expression if at
10222 least one of the operands is of enumeration type. */
10226 NIC_OVERLOADED))
10228 }
10231 }
10233 static cp_expr
10238 {
10241 }
10243 /* Parse the `? expression : assignment-expression' part of a
10244 conditional-expression. The LOGICAL_OR_EXPR is the
10245 logical-or-expression that started the conditional-expression.
10246 Returns a representation of the entire conditional-expression.
10248 This routine is used by cp_parser_assignment_expression.
10250 ? expression : assignment-expression
10252 GNU Extensions:
10254 ? : assignment-expression */
10256 static tree
10258 {
10260 cp_expr assignment_expr;
10264 /* Consume the `?' token. */
10269 {
10272 /* Implicit true clause. */
10274 c_inhibit_evaluation_warnings +=
10277 }
10278 else
10279 {
10282 /* Parse the expression. */
10283 c_inhibit_evaluation_warnings +=
10286 c_inhibit_evaluation_warnings +=
10290 }
10292 /* The next token should be a `:'. */
10294 /* Parse the assignment-expression. */
10296 c_inhibit_evaluation_warnings -=
10299 /* Make a location:
10300 LOGICAL_OR_EXPR ? EXPR : ASSIGNMENT_EXPR
10301 ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
10302 with the caret at the "?", ranging from the start of
10303 the logical_or_expr to the end of the assignment_expr. */
10308 /* Build the conditional-expression. */
10310 expr,
10311 assignment_expr,
10312 tf_warning_or_error);
10313 }
10315 /* Parse an assignment-expression.
10317 assignment-expression:
10318 conditional-expression
10319 logical-or-expression assignment-operator assignment_expression
10320 throw-expression
10321 yield-expression
10323 CAST_P is true if this expression is the target of a cast.
10324 DECLTYPE_P is true if this expression is the operand of decltype.
10326 Returns a representation for the expression. */
10328 static cp_expr
10331 {
10332 cp_expr expr;
10334 /* If the next token is the `throw' keyword, then we're looking at
10335 a throw-expression. */
10338 /* If the next token is the `co_yield' keyword, then we're looking at
10339 a yield-expression. */
10342 /* Otherwise, it must be that we are looking at a
10343 logical-or-expression. */
10344 else
10345 {
10346 /* Parse the binary expressions (logical-or-expression). */
10348 decltype_p,
10350 /* If the next token is a `?' then we're actually looking at a
10351 conditional-expression. */
10354 else
10355 {
10358 /* If it's an assignment-operator, we're using the second
10359 production. */
10360 enum tree_code assignment_operator
10363 {
10366 /* Parse the right-hand side of the assignment. */
10373 /* An assignment may not appear in a
10374 constant-expression. */
10376 NIC_ASSIGNMENT))
10378 /* Build the assignment expression. Its default
10379 location:
10380 LHS = RHS
10381 ~~~~^~~~~
10382 is the location of the '=' token as the
10383 caret, ranging from the start of the lhs to the
10384 end of the rhs. */
10389 assignment_operator,
10392 /* TODO: build_x_modify_expr doesn't honor the location,
10393 so we must set it here. */
10395 }
10396 }
10397 }
10400 }
10402 /* Parse an (optional) assignment-operator.
10404 assignment-operator: one of
10405 = *= /= %= += -= >>= <<= &= ^= |=
10407 GNU Extension:
10409 assignment-operator: one of
10410 <?= >?=
10412 If the next token is an assignment operator, the corresponding tree
10413 code is returned, and the token is consumed. For example, for
10414 `+=', PLUS_EXPR is returned. For `=' itself, the code returned is
10415 NOP_EXPR. For `/', TRUNC_DIV_EXPR is returned; for `%',
10416 TRUNC_MOD_EXPR is returned. If TOKEN is not an assignment
10417 operator, ERROR_MARK is returned. */
10419 static enum tree_code
10421 {
10425 /* Peek at the next token. */
10429 {
10475 /* Nothing else is an assignment operator. */
10477 }
10479 /* An operator followed by ... is a fold-expression, handled elsewhere. */
10484 /* If it was an assignment operator, consume it. */
10489 }
10491 /* Parse an expression.
10493 expression:
10494 assignment-expression
10495 expression , assignment-expression
10497 CAST_P is true if this expression is the target of a cast.
10498 DECLTYPE_P is true if this expression is the immediate operand of decltype,
10499 except possibly parenthesized or on the RHS of a comma (N3276).
10500 WARN_COMMA_P is true if a comma should be diagnosed.
10502 Returns a representation of the expression. */
10504 static cp_expr
10507 {
10512 {
10513 cp_expr assignment_expression;
10515 /* Parse the next assignment-expression. */
10516 assignment_expression
10519 /* We don't create a temporary for a call that is the immediate operand
10520 of decltype or on the RHS of a comma. But when we see a comma, we
10521 need to create a temporary for a call on the LHS. */
10526 assignment_expression
10530 /* If this is the first assignment-expression, we can just
10531 save it away. */
10534 else
10535 {
10536 /* Create a location with caret at the comma, ranging
10537 from the start of the LHS to the end of the RHS. */
10545 }
10546 /* If the next token is not a comma, or we're in a fold-expression, then
10547 we are done with the expression. */
10551 /* Consume the `,'. */
10554 {
10555 /* [depr.comma.subscript]: A comma expression appearing as
10556 the expr-or-braced-init-list of a subscripting expression
10557 is deprecated. A parenthesized comma expression is not
10558 deprecated. */
10560 "top-level comma expression in array subscript "
10563 }
10565 /* A comma operator cannot appear in a constant-expression. */
10568 }
10571 }
10573 /* Parse a constant-expression.
10575 constant-expression:
10576 conditional-expression
10578 If ALLOW_NON_CONSTANT_P a non-constant expression is silently
10579 accepted. If ALLOW_NON_CONSTANT_P is true and the expression is not
10580 constant, *NON_CONSTANT_P is set to TRUE. If ALLOW_NON_CONSTANT_P
10581 is false, NON_CONSTANT_P should be NULL. If ALLOW_NON_CONSTANT_P is
10582 greater than 1, this isn't really a constant-expression, only a
10583 potentially constant-evaluated expression. If STRICT_P is true,
10584 only parse a conditional-expression, otherwise parse an
10585 assignment-expression. See below for rationale. */
10587 static cp_expr
10592 {
10596 cp_expr expression;
10598 /* It might seem that we could simply parse the
10599 conditional-expression, and then check to see if it were
10600 TREE_CONSTANT. However, an expression that is TREE_CONSTANT is
10601 one that the compiler can figure out is constant, possibly after
10602 doing some simplifications or optimizations. The standard has a
10603 precise definition of constant-expression, and we must honor
10604 that, even though it is somewhat more restrictive.
10606 For example:
10608 int i[(2, 3)];
10610 is not a legal declaration, because `(2, 3)' is not a
10611 constant-expression. The `,' operator is forbidden in a
10612 constant-expression. However, GCC's constant-folding machinery
10613 will fold this operation to an INTEGER_CST for `3'. */
10615 /* Save the old settings. */
10617 saved_allow_non_integral_constant_expression_p
10620 /* We are now parsing a constant-expression. */
10622 parser->allow_non_integral_constant_expression_p
10626 /* A manifestly constant-evaluated expression is evaluated even in an
10627 unevaluated operand. */
10630 /* Although the grammar says "conditional-expression", when not STRICT_P,
10631 we parse an "assignment-expression", which also permits
10632 "throw-expression" and the use of assignment operators. In the case
10633 that ALLOW_NON_CONSTANT_P is false, we get better errors than we would
10634 otherwise. In the case that ALLOW_NON_CONSTANT_P is true, it is
10635 actually essential that we look for an assignment-expression.
10636 For example, cp_parser_initializer_clauses uses this function to
10637 determine whether a particular assignment-expression is in fact
10638 constant. */
10640 {
10641 /* Parse the binary expressions (logical-or-expression). */
10644 /* If the next token is a `?' then we're actually looking at
10645 a conditional-expression; otherwise we're done. */
10648 }
10649 else
10651 /* Restore the old settings. */
10652 parser->integral_constant_expression_p
10654 parser->allow_non_integral_constant_expression_p
10657 {
10658 /* Require an rvalue constant expression here; that's what our
10659 callers expect. Reference constant expressions are handled
10660 separately in e.g. cp_parser_template_argument. */
10669 }
10672 parser->non_integral_constant_expression_p
10676 }
10678 /* Parse __builtin_offsetof.
10680 offsetof-expression:
10681 "__builtin_offsetof" "(" type-id "," offsetof-member-designator ")"
10683 offsetof-member-designator:
10684 id-expression
10685 | offsetof-member-designator "." id-expression
10686 | offsetof-member-designator "[" expression "]"
10687 | offsetof-member-designator "->" id-expression */
10689 static cp_expr
10691 {
10693 tree type;
10694 cp_expr expr;
10695 cp_id_kind dummy;
10697 location_t finish_loc;
10699 /* We're about to accept non-integral-constant things, but will
10700 definitely yield an integral constant expression. Save and
10701 restore these values around our local parsing. */
10707 /* Consume the "__builtin_offsetof" token. */
10709 /* Consume the opening `('. */
10710 matching_parens parens;
10712 /* Parse the type-id. */
10714 {
10716 parser->type_definition_forbidden_message
10720 }
10721 /* Look for the `,'. */
10725 /* Build the (type *)null that begins the traditional offsetof macro. */
10726 tree object_ptr
10730 /* Parse the offsetof-member-designator. We begin as if we saw "expr->". */
10734 {
10737 {
10739 /* offsetof-member-designator "[" expression "]" */
10745 /* offsetof-member-designator "->" identifier */
10748 /* FALLTHRU */
10751 /* offsetof-member-designator "." identifier */
10759 /* Consume the ")" token. */
10765 /* Error. We know the following require will fail, but
10766 that gives the proper error message. */
10771 }
10772 }
10774 success:
10775 /* Make a location of the form:
10776 __builtin_offsetof (struct s, f)
10777 ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
10778 with caret at the type-id, ranging from the start of the
10779 "_builtin_offsetof" token to the close paren. */
10781 /* The result will be an INTEGER_CST, so we need to explicitly
10782 preserve the location. */
10785 failure:
10791 }
10793 /* Parse a trait expression.
10795 Returns a representation of the expression, the underlying type
10796 of the type at issue when KEYWORD is RID_UNDERLYING_TYPE. */
10798 static cp_expr
10800 {
10801 cp_trait_kind kind;
10807 {
10925 }
10927 /* Get location of initial token. */
10930 /* Consume the token. */
10933 matching_parens parens;
10936 {
10939 }
10945 {
10948 {
10951 }
10955 }
10957 {
10959 {
10963 {
10966 }
10970 }
10972 }
10977 /* Construct a location of the form:
10978 __is_trivially_copyable(_Tp)
10979 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
10980 with start == caret, finishing at the close-paren. */
10983 /* Complete the trait expression, which may mean either processing
10984 the trait expr now or saving it for template instantiation. */
10986 {
10995 }
10996 }
10998 /* Parse a lambda expression.
11000 lambda-expression:
11001 lambda-introducer lambda-declarator [opt] compound-statement
11002 lambda-introducer < template-parameter-list > requires-clause [opt]
11003 lambda-declarator [opt] compound-statement
11005 Returns a representation of the expression. */
11007 static cp_expr
11009 {
11011 tree type;
11019 {
11020 /* C++20 allows lambdas in unevaluated context, but one in the type of a
11021 non-type parameter is nonsensical.
11023 Distinguish a lambda in the parameter type from a lambda in the
11024 default argument by looking at local_variables_forbidden_p, which is
11025 only set in default arguments. */
11027 {
11032 }
11033 }
11035 {
11037 {
11039 "lambda-expression in unevaluated context"
11042 }
11044 }
11046 {
11048 {
11052 }
11054 }
11056 /* We may be in the middle of deferred access check. Disable
11057 it now. */
11070 /* Do this again now that LAMBDA_EXPR_EXTRA_SCOPE is set. */
11073 /* Now that we've started the type, add the capture fields for any
11074 explicit captures. */
11077 {
11078 /* Inside the class, surrounding template-parameter-lists do not apply. */
11079 unsigned int saved_num_template_parameter_lists
11083 bool fully_implicit_function_template_p
11087 bool auto_is_implicit_function_template_parm_p
11098 /* The body of a lambda in a discarded statement is not discarded. */
11102 /* Similarly the body of a lambda in immediate function context is not
11103 in immediate function context. */
11107 /* By virtue of defining a local class, a lambda expression has access to
11108 the private variables of enclosing classes. */
11119 {
11121 }
11123 {
11126 }
11128 /* The capture list was built up in reverse order; fix that now. */
11143 parser->fully_implicit_function_template_p
11147 parser->auto_is_implicit_function_template_parm_p
11149 }
11151 /* This field is only used during parsing of the lambda. */
11154 /* This lambda shouldn't have any proxies left at this point. */
11156 /* And now that we're done, push proxies for an enclosing lambda. */
11159 /* Update the lambda expression to a range. */
11166 else
11174 }
11176 /* Parse the beginning of a lambda expression.
11178 lambda-introducer:
11179 [ lambda-capture [opt] ]
11181 LAMBDA_EXPR is the current representation of the lambda expression. */
11183 static void
11185 {
11186 /* Need commas after the first capture. */
11189 /* Eat the leading `['. */
11192 /* Record default capture mode. "[&" "[=" "[&," "[=," */
11202 {
11208 }
11213 {
11215 tree capture_id;
11216 tree capture_init_expr;
11220 enum capture_kind_type
11221 {
11222 BY_COPY,
11223 BY_REFERENCE
11224 };
11228 {
11231 }
11235 else
11238 /* Possibly capture `this'. */
11240 {
11245 "explicit by-copy capture of %<this%> "
11246 "with by-copy capture default only available with "
11252 this_identifier);
11253 else
11258 }
11260 /* Possibly capture `*this'. */
11263 {
11267 "%<*this%> capture only available with "
11274 this_identifier);
11275 else
11280 }
11282 /* But reject `&this'. */
11285 {
11291 }
11293 /* Remember whether we want to capture as a reference or not. */
11295 {
11298 }
11303 {
11307 "pack init-capture only available with "
11311 }
11313 /* Early C++20 drafts had ...& instead of &...; be forgiving. */
11316 {
11321 }
11323 /* Get the identifier. */
11328 /* Would be nice to have a cp_parser_skip_to_closing_x for general
11329 delimiters, but I modified this to stop on unnested ']' as well. It
11330 was already changed to stop on unnested '}', so the
11331 "closing_parenthesis" name is no more misleading with my change. */
11332 {
11338 }
11340 /* Find the initializer for this capture. */
11344 {
11346 /* An explicit initializer exists. */
11349 "lambda capture initializers "
11355 {
11358 }
11361 }
11362 else
11363 {
11366 /* Turn the identifier into an id-expression. */
11367 capture_init_expr
11372 {
11375 }
11378 {
11381 capture_init_expr);
11386 }
11389 {
11392 capture_init_expr))
11396 }
11398 capture_init_expr
11399 = finish_id_expression
11401 capture_init_expr,
11415 {
11420 {
11421 /* If what follows is an initializer, the second '...' is
11422 invalid. But for cases like [...xs...], the first one
11423 is invalid. */
11430 }
11431 }
11432 }
11436 {
11441 capture_id);
11445 "capture of %qD redundant with by-reference capture "
11447 }
11449 /* Check for duplicates.
11450 Optimize for the zero or one explicit captures cases and only create
11451 the hash_set after adding second capture. */
11459 else
11460 {
11463 }
11467 else
11470 explicit_init_p);
11472 /* If there is any qualification still in effect, clear it
11473 now; we will be starting fresh with the next capture. */
11477 }
11480 }
11482 /* Parse the (optional) middle of a lambda expression.
11484 lambda-declarator:
11485 ( parameter-declaration-clause ) lambda-specifiers requires-clause [opt]
11486 lambda-specifiers (C++23)
11488 lambda-specifiers:
11489 decl-specifier-seq [opt] noexcept-specifier [opt]
11490 attribute-specifier-seq [opt] trailing-return-type [opt]
11492 LAMBDA_EXPR is the current representation of the lambda expression. */
11494 static bool
11496 {
11497 /* 5.1.1.4 of the standard says:
11498 If a lambda-expression does not include a lambda-declarator, it is as if
11499 the lambda-declarator were ().
11500 This means an empty parameter list, no attributes, and no exception
11501 specification. */
11512 cp_decl_specifier_seq lambda_specs;
11514 /* A lambda op() is const unless explicitly 'mutable'. */
11517 /* The template-parameter-list is optional, but must begin with
11518 an opening angle if present. */
11520 {
11523 "lambda templates are only available with "
11527 "lambda templates are only available with "
11535 /* We may have a constrained generic lambda; parse the requires-clause
11536 immediately after the template-parameter-list and combine with any
11537 shorthand constraints present. */
11540 {
11545 }
11547 /* We just processed one more parameter list. */
11549 }
11551 /* Committee discussion supports allowing attributes here. */
11554 /* The parameter-declaration-clause is optional (unless
11555 template-parameter-list was given), but must begin with an
11556 opening parenthesis if present. */
11558 {
11560 /* For C++20, before parsing the parameter list check if there is
11561 a consteval specifier in the corresponding decl-specifier-seq. */
11563 {
11566 {
11569 {
11572 }
11573 }
11574 }
11576 matching_parens parens;
11584 /* Parse parameters. */
11585 param_list
11586 = cp_parser_parameter_declaration_clause
11589 /* Default arguments shall not be specified in the
11590 parameter-declaration-clause of a lambda-declarator. */
11595 OPT_Wc__14_extensions,
11600 }
11604 /* In the decl-specifier-seq of the lambda-declarator, each
11605 decl-specifier shall either be mutable or constexpr. */
11609 CP_PARSER_FLAGS_ONLY_MUTABLE_OR_CONSTEXPR,
11613 {
11615 "parameter declaration before lambda declaration "
11616 "specifiers only optional with %<-std=c++2b%> or "
11619 }
11622 {
11628 }
11632 {
11634 "parameter declaration before lambda transaction "
11635 "qualifier only optional with %<-std=c++2b%> or "
11638 }
11640 /* Parse optional exception specification. */
11641 exception_spec
11645 {
11647 "parameter declaration before lambda exception "
11648 "specification only optional with %<-std=c++2b%> or "
11651 }
11653 /* GCC 8 accepted attributes here, and this is the place for standard C++11
11654 attributes that appertain to the function type. */
11657 else
11660 /* Parse optional trailing return type. */
11662 {
11665 "parameter declaration before lambda trailing "
11666 "return type only optional with %<-std=c++2b%> or "
11670 }
11672 /* Also allow GNU attributes at the very end of the declaration, the usual
11673 place for GNU attributes. */
11678 {
11679 /* Parse optional trailing requires clause. */
11682 /* The function parameters must be in scope all the way until after the
11683 trailing-return-type in case of decltype. */
11685 }
11687 /* Create the function call operator.
11689 Messing with declarators like this is no uglier than building up the
11690 FUNCTION_DECL by hand, and this is less likely to get out of sync with
11691 other code. */
11692 {
11693 cp_decl_specifier_seq return_type_specs;
11695 tree fco;
11702 {
11706 else
11708 "lambda only available with %<-std=c++17%> or "
11710 }
11721 VIRT_SPEC_UNSPECIFIED,
11722 REF_QUAL_NONE,
11723 tx_qual,
11724 exception_spec,
11725 return_type,
11726 trailing_requires_clause,
11727 UNKNOWN_LOCATION);
11731 declarator,
11734 {
11737 /* Give the object parameter a different name. */
11740 }
11742 {
11746 }
11755 }
11756 }
11758 /* Parse the body of a lambda expression, which is simply
11760 compound-statement
11762 but which requires special handling.
11763 LAMBDA_EXPR is the current representation of the lambda expression. */
11765 static void
11767 {
11769 unsigned char local_variables_forbidden_p
11773 /* The body of a lambda-expression is not a subexpression of the enclosing
11774 expression. */
11775 cp_evaluated ev;
11779 else
11780 /* Still increment function_depth so that we don't GC in the
11781 middle of an expression. */
11789 /* Clear this in case we're in the middle of a default argument. */
11793 {
11798 /* Originally C++11 required us to peek for 'return expr'; and
11799 process it specially here to deduce the return type. N3638
11800 removed the need for that. */
11804 }
11811 else
11813 }
11815 /* Statements [gram.stmt.stmt] */
11817 /* Build and add a DEBUG_BEGIN_STMT statement with location LOC. */
11819 static void
11821 {
11825 /* A concept is never expanded normally. */
11831 }
11833 struct cp_omp_attribute_data
11834 {
11837 c_omp_directive_kind kind;
11838 };
11840 /* Handle omp::directive and omp::sequence attributes in ATTRS
11841 (if any) at the start of a statement or in attribute-declaration. */
11843 static tree
11845 {
11856 {
11857 cnt++;
11859 {
11865 {
11867 "mixing OpenMP directives with attribute and pragma "
11871 }
11874 {
11882 else
11885 }
11891 {
11893 "unknown OpenMP directive name in %<omp::directive%>"
11896 }
11899 {
11900 /* ordered is C_OMP_DIR_CONSTRUCT only if it doesn't contain
11901 depend clause. */
11910 }
11912 {
11913 /* error with at(execution) clause is C_OMP_DIR_STANDALONE. */
11917 paren_depth++;
11919 paren_depth--;
11930 {
11933 }
11934 }
11939 }
11940 cp_omp_attribute_data v = {};
11943 }
11944 else
11957 {
11962 }
11963 else
11964 {
11966 {
11969 }
11970 }
11973 {
11975 "OpenMP construct among %<omp::directive%> attributes"
11976 " requires all %<omp::directive%> attributes on the"
11979 }
11981 {
11983 "multiple OpenMP standalone directives among"
11984 " %<omp::directive%> attributes must be all within the"
11987 }
11993 {
11995 "standalone OpenMP directives in %<omp::directive%> attribute"
11998 }
12000 {
12004 {
12006 "mixing OpenMP directives with attribute and pragma "
12009 }
12010 }
12014 tokens++;
12019 {
12026 cp_token tok = {};
12034 tok = {};
12039 }
12040 cp_token tok = {};
12052 /* Move the current source position to that of the first token in the
12053 new lexer. */
12056 }
12058 /* Handle omp::directive and omp::sequence attributes in *PATTRS
12059 (if any) at the start or after declaration-id of a declaration. */
12061 static void
12065 {
12076 {
12078 {
12085 {
12093 else
12096 }
12106 {
12108 {
12111 }
12113 {
12115 "mixing OpenMP directives with attribute and "
12118 }
12119 }
12120 }
12121 }
12124 {
12129 else
12132 }
12137 {
12146 }
12148 }
12150 /* Parse a statement.
12152 statement:
12153 labeled-statement
12154 expression-statement
12155 compound-statement
12156 selection-statement
12157 iteration-statement
12158 jump-statement
12159 declaration-statement
12160 try-block
12162 C++11:
12164 statement:
12165 labeled-statement
12166 attribute-specifier-seq (opt) expression-statement
12167 attribute-specifier-seq (opt) compound-statement
12168 attribute-specifier-seq (opt) selection-statement
12169 attribute-specifier-seq (opt) iteration-statement
12170 attribute-specifier-seq (opt) jump-statement
12171 declaration-statement
12172 attribute-specifier-seq (opt) try-block
12174 init-statement:
12175 expression-statement
12176 simple-declaration
12177 alias-declaration
12179 TM Extension:
12181 statement:
12182 atomic-statement
12184 IN_COMPOUND is true when the statement is nested inside a
12185 cp_parser_compound_statement.
12187 If IF_P is not NULL, *IF_P is set to indicate whether the statement
12188 is a (possibly labeled) if statement which is not enclosed in braces
12189 and has an else clause. This is used to implement -Wparentheses.
12191 CHAIN is a vector of if-else-if conditions. */
12193 static void
12197 {
12203 /* A copy of IN_COMPOUND which is set to false after seeing a label.
12204 This matters for certain pragmas. */
12207 restart:
12210 /* There is no statement yet. */
12217 /* In obj-c++, seeing '[[' might be the either the beginning of
12218 c++11 attributes, or a nested objc-message-expression. So
12219 let's parse the c++11 attributes tentatively. */
12225 {
12228 }
12231 /* Peek at the next token. */
12237 {
12241 {
12268 }
12274 {
12276 std_attrs);
12278 }
12279 }
12282 /* Remember the location of the first token in the statement. */
12286 /* If this is a keyword, then that will often determine what kind of
12287 statement we have. */
12289 {
12293 {
12296 /* Looks like a labeled-statement with a case label.
12297 Parse the label, and then use tail recursion to parse
12298 the statement. */
12326 /* Objective-C++ exception-handling constructs. */
12342 /* This must be a namespace alias definition. */
12344 {
12345 /* Attributes should be parsed as part of the
12346 declaration, so let's un-parse them. */
12349 }
12367 /* It might be a keyword like `int' that can start a
12368 declaration-statement. */
12370 }
12371 }
12373 {
12374 /* If the next token is a `:', then we are looking at a
12375 labeled-statement. */
12378 {
12379 /* Looks like a labeled-statement with an ordinary label.
12380 Parse the label, and then use tail recursion to parse
12381 the statement. */
12385 /* If there's no statement, it's not a labeled-statement, just
12386 a label. That's allowed in C++23, but only if we're at the
12387 end of a compound-statement. */
12390 {
12394 "label at end of compound statement only available "
12397 }
12401 }
12402 }
12403 /* Anything that starts with a `{' must be a compound-statement. */
12405 {
12408 }
12409 /* CPP_PRAGMA is a #pragma inside a function body, which constitutes
12410 a statement all its own. */
12412 {
12413 do_pragma:;
12416 /* Only certain OpenMP pragmas are attached to statements, and thus
12417 are considered statements themselves. All others are not. In
12418 the context of a compound, accept the pragma as a "statement" and
12419 return so that we can check for a close brace. Otherwise we
12420 require a real statement and must go back and read one. */
12428 {
12430 {
12437 }
12440 }
12448 }
12450 {
12453 }
12455 /* Everything else must be a declaration-statement or an
12456 expression-statement. Try for the declaration-statement
12457 first, unless we are looking at a `;', in which case we know that
12458 we have an expression-statement. */
12460 {
12462 {
12464 /* Attributes should be parsed as part of the declaration,
12465 so let's un-parse them. */
12470 /* Try to parse the declaration-statement. */
12473 /* If that worked, we're done. */
12476 /* It didn't work, restore the post-attribute position. */
12478 {
12481 {
12486 i++;
12488 {
12494 /* Don't handle OpenMP attribs on keywords that
12495 always start a declaration statement but don't
12496 accept attribute before it and therefore
12497 the tentative cp_parser_declaration_statement
12498 fails to parse because of that. */
12503 }
12506 {
12508 std_attrs
12509 = cp_parser_handle_statement_omp_attributes
12515 }
12516 }
12517 }
12518 }
12519 /* All preceding labels have been parsed at this point. */
12525 /* Look for an expression-statement instead. */
12528 /* Handle [[fallthrough]];. */
12530 {
12531 /* The next token after the fallthrough attribute is ';'. */
12533 {
12534 /* Turn [[fallthrough]]; into FALLTHROUGH ();. */
12536 IFN_FALLTHROUGH,
12539 }
12540 else
12544 }
12545 }
12547 /* Set the line number for the statement. */
12551 /* Allow "[[fallthrough]];", but warn otherwise. */
12554 OPT_Wattributes,
12556 }
12558 /* Append ATTR to attribute list ATTRS. */
12560 tree
12562 {
12568 }
12570 /* Parse the label for a labeled-statement, i.e.
12572 label:
12573 attribute-specifier-seq[opt] identifier :
12574 attribute-specifier-seq[opt] case constant-expression :
12575 attribute-specifier-seq[opt] default :
12577 labeled-statement:
12578 label statement
12580 GNU Extension:
12581 case constant-expression ... constant-expression : statement
12583 When a label is parsed without errors, the label is added to the
12584 parse tree by the finish_* functions, so this function doesn't
12585 have to return the label. */
12587 static void
12589 {
12594 /* The next token should be an identifier. */
12598 {
12601 }
12603 /* Remember whether this case or a user-defined label is allowed to fall
12604 through to. */
12609 {
12611 {
12615 /* Consume the `case' token. */
12617 /* Parse the constant-expression. */
12624 {
12625 /* Consume the `...' token. */
12631 /* We don't need to emit warnings here, as the common code
12632 will do this for us. */
12633 }
12634 else
12638 {
12641 {
12644 }
12645 }
12646 else
12649 expr);
12650 }
12654 /* Consume the `default' token. */
12658 {
12661 {
12664 }
12665 }
12666 else
12671 /* Anything else must be an ordinary label. */
12676 }
12678 /* Require the `:' token. */
12681 /* An ordinary label may optionally be followed by attributes.
12682 However, this is only permitted if the attributes are then
12683 followed by a semicolon. This is because, for backward
12684 compatibility, when parsing
12685 lab: __attribute__ ((unused)) int i;
12686 we want the attribute to attach to "i", not "lab". */
12689 {
12690 tree attrs;
12694 /* And fallthrough always binds to the expression-statement. */
12699 ;
12700 else
12702 }
12708 }
12710 /* Parse an expression-statement.
12712 expression-statement:
12713 expression [opt] ;
12715 Returns the new EXPR_STMT -- or NULL_TREE if the expression
12716 statement consists of nothing more than an `;'. IN_STATEMENT_EXPR_P
12717 indicates whether this expression-statement is part of an
12718 expression statement. */
12720 static tree
12722 {
12727 /* There might be attribute fallthrough. */
12730 /* If the next token is a ';', then there is no expression
12731 statement. */
12733 {
12737 {
12740 }
12741 }
12743 /* Handle [[fallthrough]];. */
12745 {
12746 /* The next token after the fallthrough attribute is ';'. */
12748 /* Turn [[fallthrough]]; into FALLTHROUGH ();. */
12751 else
12755 }
12757 /* Allow "[[fallthrough]];", but warn otherwise. */
12762 /* Give a helpful message for "A<T>::type t;" and the like. */
12765 {
12772 {
12773 /* A::A a; */
12778 }
12779 }
12781 /* Consume the final `;'. */
12786 /* This is the final expression statement of a statement
12787 expression. */
12793 }
12795 /* Parse a compound-statement.
12797 compound-statement:
12798 { statement-seq [opt] label-seq [opt] }
12800 label-seq:
12801 label
12802 label-seq label
12804 GNU extension:
12806 compound-statement:
12807 { label-declaration-seq [opt] statement-seq [opt] }
12809 label-declaration-seq:
12810 label-declaration
12811 label-declaration-seq label-declaration
12813 Returns a tree representing the statement. */
12815 static tree
12818 {
12819 tree compound_stmt;
12820 matching_braces braces;
12822 /* Consume the `{'. */
12829 /* Begin the compound-statement. */
12831 /* If the next keyword is `__label__' we have a label declaration. */
12834 /* Parse an (optional) statement-seq. */
12837 /* Consume the `}'. */
12840 /* Finish the compound-statement. */
12844 }
12846 /* Parse an (optional) statement-seq.
12848 statement-seq:
12849 statement
12850 statement-seq [opt] statement */
12852 static void
12854 {
12855 /* Scan statements until there aren't any more. */
12857 {
12860 /* If we are looking at a `}', then we have run out of
12861 statements; the same is true if we have reached the end
12862 of file, or have stumbled upon a stray '@end'. */
12869 /* If we are in a compound statement and find 'else' then
12870 something went wrong. */
12872 {
12875 else
12876 {
12879 }
12880 }
12882 /* Parse the statement. */
12884 }
12885 }
12887 /* Return true if this is the C++20 version of range-based-for with
12888 init-statement. */
12890 static bool
12892 {
12895 /* Save tokens so that we can put them back. */
12898 /* There has to be an unnested ; followed by an unnested :. */
12901 CPP_SEMICOLON,
12905 /* We found the semicolon, eat it now. */
12908 /* Now look for ':' that is not nested in () or {}. */
12911 CPP_COLON,
12914 out:
12915 /* Roll back the tokens we skipped. */
12919 }
12921 /* Return true if we're looking at (init; cond), false otherwise. */
12923 static bool
12925 {
12926 /* Save tokens so that we can put them back. */
12929 /* Look for ';' that is not nested in () or {}. */
12932 CPP_SEMICOLON,
12935 /* Roll back the tokens we skipped. */
12939 }
12941 /* Parse a selection-statement.
12943 selection-statement:
12944 if ( init-statement [opt] condition ) statement
12945 if ( init-statement [opt] condition ) statement else statement
12946 switch ( init-statement [opt] condition ) statement
12948 Returns the new IF_STMT or SWITCH_STMT.
12950 If IF_P is not NULL, *IF_P is set to indicate whether the statement
12951 is a (possibly labeled) if statement which is not enclosed in
12952 braces and has an else clause. This is used to implement
12953 -Wparentheses.
12955 CHAIN is a vector of if-else-if conditions. This is used to implement
12956 -Wduplicated-cond. */
12958 static tree
12961 {
12964 token_indent_info guard_tinfo;
12969 /* Peek at the next token. */
12973 /* See what kind of keyword it is. */
12976 {
12979 {
12980 tree statement;
12981 tree condition;
12986 RID_CONSTEXPR))
12987 {
12992 "%<if constexpr%> only available with "
12994 }
12997 {
12999 RID_CONSTEVAL))
13003 RID_CONSTEVAL))
13004 {
13007 }
13008 }
13010 {
13014 "%<if consteval%> only available with "
13025 {
13028 }
13034 {
13035 location_t before_loc
13041 }
13045 /* If the next token is `else', parse the else-clause. */
13047 RID_ELSE))
13048 {
13052 /* Consume the `else' keyword. */
13058 {
13062 }
13066 guard_tinfo);
13069 {
13070 location_t before_loc
13075 }
13078 }
13082 {
13086 }
13090 }
13092 /* Look for the `('. */
13093 matching_parens parens;
13095 {
13098 }
13100 /* Begin the selection-statement. */
13102 {
13105 }
13106 else
13109 /* Parse the optional init-statement. */
13111 {
13112 tree decl;
13115 OPT_Wc__17_extensions,
13116 "init-statement in selection statements only available "
13119 /* A non-empty init-statement can have arbitrary side
13120 effects. */
13123 }
13125 /* Parse the condition. */
13127 /* Look for the `)'. */
13133 {
13137 /* Add the condition. */
13144 /* Parse the then-clause. */
13148 /* Outside a template, the non-selected branch of a constexpr
13149 if is a 'discarded statement', i.e. unevaluated. */
13154 {
13157 }
13160 guard_tinfo);
13167 {
13171 }
13173 /* If the next token is `else', parse the else-clause. */
13175 RID_ELSE))
13176 {
13180 {
13183 }
13185 guard_tinfo
13187 /* Consume the `else' keyword. */
13190 {
13192 RID_IF)
13194 {
13195 /* We've got "if (COND) else if (COND2)". Start
13196 the condition chain and add COND as the first
13197 element. */
13201 {
13202 /* Wrap it in a NOP_EXPR so that we can set the
13203 location of the condition. */
13205 condition);
13208 }
13209 }
13211 RID_IF))
13212 /* This is if-else without subsequent if. Zap the
13213 condition chain; we would have already warned at
13214 this point. */
13216 }
13218 /* Parse the else-clause. */
13224 /* If we are currently parsing a then-clause, then
13225 IF_P will not be NULL. We set it to true to
13226 indicate that this if statement has an else clause.
13227 This may trigger the Wparentheses warning below
13228 when we get back up to the parent if statement. */
13233 {
13237 }
13238 }
13239 else
13240 {
13241 /* This if statement does not have an else clause. If
13242 NESTED_IF is true, then the then-clause has an if
13243 statement which does have an else clause. We warn
13244 about the potential ambiguity. */
13247 "suggest explicit braces to avoid ambiguous"
13250 /* We don't need the condition chain anymore. */
13252 }
13254 /* Now we're all done with the if-statement. */
13256 }
13257 else
13258 {
13262 /* Add the condition. */
13265 /* Parse the body of the switch-statement. */
13271 guard_tinfo);
13275 /* Now we're all done with the switch-statement. */
13277 }
13280 }
13286 }
13287 }
13289 /* Helper function for cp_parser_condition and cp_parser_simple_declaration.
13290 If we have seen at least one decl-specifier, and the next token is not
13291 a parenthesis (after "int (" we might be looking at a functional cast)
13292 neither we are dealing with a concept-check expression then we must be
13293 looking at a declaration. */
13295 static void
13298 {
13307 }
13309 /* Helper function for cp_parser_condition. Enforces [stmt.stmt]/2:
13310 The declarator shall not specify a function or an array. Returns
13311 TRUE if the declarator is valid, FALSE otherwise. */
13313 static bool
13316 location_t loc)
13317 {
13321 {
13326 else
13334 }
13335 else
13337 }
13339 /* Parse a condition.
13341 condition:
13342 expression
13343 type-specifier-seq declarator = initializer-clause
13344 type-specifier-seq declarator braced-init-list
13346 GNU Extension:
13348 condition:
13349 type-specifier-seq declarator asm-specification [opt]
13350 attributes [opt] = assignment-expression
13352 Returns the expression that should be tested. */
13354 static tree
13356 {
13357 cp_decl_specifier_seq type_specifiers;
13361 /* Try the declaration first. */
13363 /* New types are not allowed in the type-specifier-seq for a
13364 condition. */
13366 parser->type_definition_forbidden_message
13368 /* Parse the type-specifier-seq. */
13370 CP_PARSER_FLAGS_ONLY_TYPE_OR_CONSTEXPR,
13373 /* Restore the saved message. */
13376 /* Gather the attributes that were provided with the
13377 decl-specifiers. */
13382 /* If all is well, we might be looking at a declaration. */
13384 {
13385 tree decl;
13386 tree asm_specification;
13387 tree attributes;
13392 /* Parse the declarator. */
13394 CP_PARSER_FLAGS_NONE,
13400 /* Parse the attributes. */
13402 /* Parse the asm-specification. */
13404 /* If the next token is not an `=' or '{', then we might still be
13405 looking at an expression. For example:
13407 if (A(a).x)
13409 looks like a decl-specifier-seq and a declarator -- but then
13410 there is no `=', so this is an expression. */
13415 /* If we did see an `=' or '{', then we are looking at a declaration
13416 for sure. */
13418 {
13419 tree pushed_scope;
13426 /* Create the declaration. */
13433 /* Parse the initializer. */
13435 {
13439 }
13441 {
13442 /* Consume the `='. */
13446 }
13447 else
13448 {
13451 }
13455 /* Process the initializer. */
13458 asm_specification,
13459 flags);
13465 }
13466 }
13467 /* If we didn't even get past the declarator successfully, we are
13468 definitely not looking at a declaration. */
13469 else
13472 /* Otherwise, we are looking at an expression. */
13474 }
13476 /* Parses a for-statement or range-for-statement until the closing ')',
13477 not included. */
13479 static tree
13481 {
13485 /* Begin the for-statement. */
13488 /* Maybe parse the optional init-statement in a range-based for loop. */
13490 /* Checked for diagnostic purposes only. */
13492 {
13493 tree dummy;
13496 {
13498 OPT_Wc__20_extensions,
13499 "range-based %<for%> loops with initializer only "
13502 }
13503 }
13505 /* Parse the initialization. */
13511 else
13513 }
13515 static tree
13518 {
13519 /* Normal for loop */
13522 tree stmt;
13525 /* The init-statement has already been parsed in
13526 cp_parser_init_statement, so no work is needed here. */
13529 /* If there's a condition, process it. */
13533 {
13537 }
13539 {
13543 }
13545 /* Look for the `;'. */
13548 /* If there's an expression, process it. */
13554 }
13556 /* Tries to parse a range-based for-statement:
13558 range-based-for:
13559 decl-specifier-seq declarator : expression
13561 The decl-specifier-seq declarator and the `:' are already parsed by
13562 cp_parser_init_statement. If processing_template_decl it returns a
13563 newly created RANGE_FOR_STMT; if not, it is converted to a
13564 regular FOR_STMT. */
13566 static tree
13569 {
13576 /* Get the range declaration momentarily out of the way so that
13577 the range expression doesn't clash with it. */
13579 {
13581 {
13583 /* For decomposition declaration get all of the corresponding
13584 declarations out of the way. */
13588 {
13594 {
13600 }
13601 }
13602 }
13604 {
13609 }
13610 }
13613 {
13616 }
13617 else
13620 /* Put the range declaration(s) back into scope. */
13622 {
13626 }
13628 /* finish_omp_for has its own code for the following, so just
13629 return the range_expr instead. */
13633 /* If in template, STMT is converted to a normal for-statement
13634 at instantiation. If not, it is done just ahead. */
13636 {
13646 /* do_auto_deduction doesn't mess with template init-lists. */
13649 }
13650 else
13651 {
13655 unroll);
13656 }
13658 }
13660 /* Subroutine of cp_convert_range_for: given the initializer expression,
13661 builds up the range temporary. */
13663 static tree
13665 {
13666 /* Find out the type deduced by the declaration
13667 `auto &&__range = range_expr'. */
13672 /* Create the __range variable. */
13679 }
13681 /* Used by cp_parser_range_for in template context: we aren't going to
13682 do a full conversion yet, but we still need to resolve auto in the
13683 type of the for-range-declaration if present. This is basically
13684 a shortcut version of cp_convert_range_for. */
13686 static void
13688 {
13691 {
13694 iter_type = (cp_parser_perform_range_for_lookup
13697 {
13699 iter_type);
13702 tf_warning_or_error);
13705 tf_warning_or_error,
13706 adc_variable_type);
13707 }
13708 }
13709 }
13711 /* Warns when the loop variable should be changed to a reference type to
13712 avoid unnecessary copying. I.e., from
13714 for (const auto x : range)
13716 where range returns a reference, to
13718 for (const auto &x : range)
13720 if this version doesn't make a copy.
13722 This function also warns when the loop variable is initialized with
13723 a value of a different type resulting in a copy:
13725 int arr[10];
13726 for (const double &x : arr)
13728 DECL is the RANGE_DECL; EXPR is the *__for_begin expression.
13729 This function is never called when processing_template_decl is on. */
13731 static void
13733 {
13745 {
13747 {
13748 auto_diagnostic_group d;
13750 "loop variable %qD of type %qT binds to a temporary "
13753 {
13755 TYPE_QUAL_CONST);
13760 }
13761 }
13763 }
13767 /* Since small trivially copyable types are cheap to copy, we suppress the
13768 warning for them. 64B is a common size of a cache line. */
13775 /* If we could initialize the reference directly, it wouldn't involve any
13776 copies. */
13780 auto_diagnostic_group d;
13784 {
13788 }
13789 }
13791 /* Converts a range-based for-statement into a normal
13792 for-statement, as per the definition.
13794 for (RANGE_DECL : RANGE_EXPR)
13795 BLOCK
13797 should be equivalent to:
13799 {
13800 auto &&__range = RANGE_EXPR;
13801 for (auto __begin = BEGIN_EXPR, __end = END_EXPR;
13802 __begin != __end;
13803 ++__begin)
13804 {
13805 RANGE_DECL = *__begin;
13806 BLOCK
13807 }
13808 }
13810 If RANGE_EXPR is an array:
13811 BEGIN_EXPR = __range
13812 END_EXPR = __range + ARRAY_SIZE(__range)
13813 Else if RANGE_EXPR has a member 'begin' or 'end':
13814 BEGIN_EXPR = __range.begin()
13815 END_EXPR = __range.end()
13816 Else:
13817 BEGIN_EXPR = begin(__range)
13818 END_EXPR = end(__range);
13820 If __range has a member 'begin' but not 'end', or vice versa, we must
13821 still use the second alternative (it will surely fail, however).
13822 When calling begin()/end() in the third alternative we must use
13823 argument dependent lookup, but always considering 'std' as an associated
13824 namespace. */
13826 tree
13830 {
13838 /* If an error happened previously do nothing or else a lot of
13839 unhelpful errors would be issued. */
13841 else
13842 {
13843 tree range_temp;
13847 /* Can't bind a reference to an array of runtime bound. */
13849 else
13850 {
13855 LOOKUP_ONLYCONVERTING);
13857 }
13860 }
13862 /* The new for initialization statement. */
13864 iter_type);
13870 LOOKUP_ONLYCONVERTING);
13880 LOOKUP_ONLYCONVERTING);
13884 /* The new for condition. */
13891 /* The new increment expression. */
13894 tf_warning_or_error);
13900 /* The declaration is initialized with *__begin inside the loop body. */
13905 LOOKUP_ONLYCONVERTING);
13912 }
13914 /* Solves BEGIN_EXPR and END_EXPR as described in cp_convert_range_for.
13915 We need to solve both at the same time because the method used
13916 depends on the existence of members begin or end.
13917 Returns the type deduced for the iterator expression. */
13919 static tree
13921 {
13923 {
13926 }
13929 {
13934 }
13936 {
13937 /* If RANGE is an array, we will use pointer arithmetic. */
13940 range,
13944 }
13945 else
13946 {
13947 /* If it is not an array, we must do a bit of magic. */
13957 tf_warning_or_error);
13960 tf_warning_or_error);
13963 {
13964 /* Use the member functions. */
13967 }
13968 else
13969 {
13970 /* Use global functions with ADL. */
13971 releasing_vec vec;
13976 tf_warning_or_error);
13978 tf_warning_or_error);
13980 tf_warning_or_error);
13982 tf_warning_or_error);
13983 }
13985 /* Last common checks. */
13987 {
13988 /* If one of the expressions is an error do no more checks. */
13991 }
13994 /* Can happen, when, eg, in a template context, Koenig lookup
13995 can't resolve begin/end (c++/58503). */
13997 else
13998 {
14000 /* The unqualified type of the __begin and __end temporaries should
14001 be the same, as required by the multiple auto declaration. */
14003 {
14010 /* P0184R0 allows __begin and __end to have different types,
14011 but make sure they are comparable so we can give a better
14013 else
14017 }
14019 }
14020 }
14021 }
14023 /* Helper function for cp_parser_perform_range_for_lookup.
14024 Builds a tree for RANGE.IDENTIFIER(). */
14026 static tree
14028 {
14036 releasing_vec vec;
14040 tf_warning_or_error);
14042 }
14044 /* Parse an iteration-statement.
14046 iteration-statement:
14047 while ( condition ) statement
14048 do statement while ( expression ) ;
14049 for ( init-statement condition [opt] ; expression [opt] )
14050 statement
14052 Returns the new WHILE_STMT, DO_STMT, FOR_STMT or RANGE_FOR_STMT. */
14054 static tree
14057 {
14060 tree statement;
14062 token_indent_info guard_tinfo;
14064 /* Peek at the next token. */
14071 /* Remember whether or not we are already within an iteration
14072 statement. */
14075 /* See what kind of keyword it is. */
14078 {
14080 {
14081 tree condition;
14083 /* Begin the while-statement. */
14085 /* Look for the `('. */
14086 matching_parens parens;
14088 /* Parse the condition. */
14091 /* Look for the `)'. */
14093 /* Parse the dependent statement. */
14099 /* We're done with the while-statement. */
14101 }
14105 {
14106 tree expression;
14108 /* Begin the do-statement. */
14110 /* Parse the body of the do-statement. */
14117 /* Look for the `while' keyword. */
14119 /* Look for the `('. */
14120 matching_parens parens;
14122 /* Parse the expression. */
14124 /* We're done with the do-statement. */
14126 /* Look for the `)'. */
14128 /* Look for the `;'. */
14130 }
14134 {
14135 /* Look for the `('. */
14136 matching_parens parens;
14141 /* Look for the `)'. */
14144 /* Parse the body of the for-statement. */
14151 /* We're done with the for-statement. */
14153 }
14160 }
14163 }
14165 /* Parse an init-statement or the declarator of a range-based-for.
14166 Returns true if a range-based-for declaration is seen.
14168 init-statement:
14169 expression-statement
14170 simple-declaration
14171 alias-declaration */
14173 static bool
14175 {
14176 /* If the next token is a `;', then we have an empty
14177 expression-statement. Grammatically, this is also a
14178 simple-declaration, but an invalid one, because it does not
14179 declare anything. Therefore, if we did not handle this case
14180 specially, we would issue an error message about an invalid
14181 declaration. */
14183 {
14187 /* A colon is used in range-based for. */
14190 /* We're going to speculatively look for a declaration, falling back
14191 to an expression, if necessary. */
14195 {
14201 OPT_Wc__23_extensions,
14202 "alias-declaration in init-statement only "
14204 }
14205 else
14206 /* Parse the declaration. */
14209 decl);
14212 {
14213 /* It is a range-for, consume the ':'. */
14218 OPT_Wc__11_extensions,
14219 "range-based %<for%> loops only available with "
14221 }
14223 /* The ';' is not consumed yet because we told
14224 cp_parser_simple_declaration not to. */
14229 /* If the tentative parse failed, then we shall need to look for an
14230 expression-statement. */
14231 }
14232 /* If we are here, it is an expression-statement. */
14235 }
14237 /* Parse a jump-statement.
14239 jump-statement:
14240 break ;
14241 continue ;
14242 return expression [opt] ;
14243 return braced-init-list ;
14244 coroutine-return-statement;
14245 goto identifier ;
14247 GNU extension:
14249 jump-statement:
14250 goto * expression ;
14252 Returns the new BREAK_STMT, CONTINUE_STMT, RETURN_EXPR, or GOTO_EXPR. */
14254 static tree
14256 {
14262 /* Peek at the next token. */
14267 /* See what kind of keyword it is. */
14270 {
14274 {
14291 }
14297 {
14301 /* Fall through. */
14311 }
14317 {
14318 tree expr;
14322 {
14326 }
14329 else
14330 /* If the next token is a `;', then there is no
14331 expression. */
14333 /* Build the return-statement, check co-return first, since type
14334 deduction is not valid there. */
14339 else
14341 /* Look for the final `;'. */
14343 }
14350 {
14354 }
14356 /* Create the goto-statement. */
14358 {
14359 /* Issue a warning about this use of a GNU extension. */
14361 /* Consume the '*' token. */
14363 /* Parse the dependent expression. */
14365 }
14366 else
14368 /* Look for the final `;'. */
14375 }
14378 }
14380 /* Parse a declaration-statement.
14382 declaration-statement:
14383 block-declaration */
14385 static void
14387 {
14390 /* Get the high-water mark for the DECLARATOR_OBSTACK. */
14393 /* Parse the block-declaration. */
14396 /* Free any declarators allocated. */
14398 }
14400 /* Some dependent statements (like `if (cond) statement'), are
14401 implicitly in their own scope. In other words, if the statement is
14402 a single statement (as opposed to a compound-statement), it is
14403 none-the-less treated as if it were enclosed in braces. Any
14404 declarations appearing in the dependent statement are out of scope
14405 after control passes that point. This function parses a statement,
14406 but ensures that is in its own scope, even if it is not a
14407 compound-statement.
14409 If IF_P is not NULL, *IF_P is set to indicate whether the statement
14410 is a (possibly labeled) if statement which is not enclosed in
14411 braces and has an else clause. This is used to implement
14412 -Wparentheses.
14414 CHAIN is a vector of if-else-if conditions. This is used to implement
14415 -Wduplicated-cond.
14417 Returns the new statement. */
14419 static tree
14423 {
14424 tree statement;
14427 token_indent_info body_tinfo
14433 /* Mark if () ; with a special NOP_EXPR. */
14435 {
14446 }
14447 /* if a compound is opened, we simply parse the statement directly. */
14450 /* If the token is not a `{', then we must take special action. */
14451 else
14452 {
14453 /* Create a compound-statement. */
14455 /* Parse the dependent-statement. */
14458 /* Finish the dummy compound-statement. */
14460 }
14462 token_indent_info next_tinfo
14471 /* Return the statement. */
14473 }
14475 /* For some dependent statements (like `while (cond) statement'), we
14476 have already created a scope. Therefore, even if the dependent
14477 statement is a compound-statement, we do not want to create another
14478 scope. */
14480 static void
14483 {
14484 /* If the token is a `{', then we must take special action. */
14486 {
14487 token_indent_info body_tinfo
14493 token_indent_info next_tinfo
14502 }
14503 else
14504 {
14505 /* Avoid calling cp_parser_compound_statement, so that we
14506 don't create a new scope. Do everything else by hand. */
14507 matching_braces braces;
14509 /* If the next keyword is `__label__' we have a label declaration. */
14512 /* Parse an (optional) statement-seq. */
14515 }
14516 }
14518 /* Modules */
14520 /* Parse a module-name,
14521 identifier
14522 module-name . identifier
14523 header-name
14525 Returns a pointer to module object, NULL. */
14529 {
14532 {
14536 }
14541 {
14544 }
14547 {
14549 {
14552 }
14563 }
14566 }
14568 /* Named module-declaration
14569 __module ; PRAGMA_EOL
14570 __module private ; PRAGMA_EOL (unimplemented)
14571 [__export] __module module-name attr-spec-seq-opt ; PRAGMA_EOL
14572 */
14574 static module_parse
14577 {
14578 /* We're a pseudo pragma. */
14583 {
14587 }
14590 {
14591 /* Start global module fragment. */
14596 }
14601 {
14609 {
14612 }
14613 else
14615 "private module fragment only permitted in purview"
14617 }
14619 {
14620 /* Neither the first declaration, nor in a GMF. */
14623 skip_eol:
14625 }
14626 else
14627 {
14637 }
14640 }
14642 /* Import-declaration
14643 [__export] __import module-name attr-spec-seq-opt ; PRAGMA_EOL */
14645 static void
14648 {
14649 /* We're a pseudo pragma. */
14654 {
14657 note_lexer:
14659 " disambiguation, to prevent this being considered a"
14661 skip_eol:
14663 }
14665 {
14668 }
14669 else
14670 {
14683 {
14684 /* Module-purview imports must not be from source inclusion
14685 [cpp.import]/7 */
14694 }
14697 }
14698 }
14700 /* export-declaration.
14702 export declaration
14703 export { declaration-seq-opt } */
14705 static void
14707 {
14726 {
14733 }
14734 else
14735 {
14736 /* Explicitly check if the next tokens might be a
14737 module-directive line, so we can give a clearer error message
14738 about why the directive will be rejected. */
14745 }
14748 }
14750 /* Declarations [gram.dcl.dcl] */
14752 /* Parse an optional declaration-sequence. TOP_LEVEL is true, if this
14753 is the top-level declaration sequence. That affects whether we
14754 deal with module-preamble.
14756 declaration-seq:
14757 declaration
14758 declaration-seq declaration */
14760 static void
14762 {
14764 {
14770 else
14772 }
14773 }
14775 /* Parse a declaration.
14777 declaration:
14778 block-declaration
14779 function-definition
14780 template-declaration
14781 explicit-instantiation
14782 explicit-specialization
14783 linkage-specification
14784 namespace-definition
14786 C++17:
14787 deduction-guide
14789 modules:
14790 (all these are only allowed at the outermost level, check
14791 that semantically, for better diagnostics)
14792 module-declaration
14793 module-export-declaration
14794 module-import-declaration
14795 export-declaration
14797 GNU extension:
14799 declaration:
14800 __extension__ declaration */
14802 static void
14804 {
14807 /* Check for the `__extension__' keyword. */
14809 {
14810 /* Parse the qualified declaration. */
14812 /* Restore the PEDANTIC flag. */
14816 }
14818 /* Try to figure out what kind of declaration is present. */
14824 {
14826 /* A declaration consisting of a single semicolon is invalid
14827 * before C++11. Allow it unless we're being pedantic. */
14831 }
14835 CPP_SEMICOLON))
14836 {
14841 {
14844 std_attrs);
14846 {
14849 {
14851 CPP_PRAGMA));
14853 }
14855 }
14856 }
14864 }
14866 /* Get the high-water mark for the DECLARATOR_OBSTACK. */
14871 /* Conditionally, allow attributes to precede a linkage specification. */
14873 {
14881 {
14883 /* We might have already been here. */
14885 {
14893 }
14896 }
14897 else
14898 {
14901 }
14902 }
14903 /* If we already had some attributes, and we've added more, then prepend.
14904 Otherwise attributes just contains any that we just read. */
14906 {
14910 }
14912 /* If the next token is `extern' and the following token is a string
14913 literal, then we have a linkage specification. */
14917 /* If the next token is `template', then we have either a template
14918 declaration, an explicit instantiation, or an explicit
14919 specialization. */
14921 {
14922 /* `template <>' indicates a template specialization. */
14926 /* `template <' indicates a template declaration. */
14929 /* Anything else must be an explicit instantiation. */
14930 else
14932 }
14933 /* If the next token is `export', it's new-style modules or
14934 old-style template. */
14936 {
14939 else
14941 }
14945 {
14950 // In module purview this will be ill-formed.
14956 else
14958 }
14959 /* If the next token is `extern', 'static' or 'inline' and the one
14960 after that is `template', we have a GNU extended explicit
14961 instantiation directive. */
14968 /* If the next token is `namespace', check for a named or unnamed
14969 namespace definition. */
14978 /* An unnamed namespace definition. */
14982 /* An inline (associated) namespace definition. */
14986 /* Objective-C++ declaration/definition. */
14993 /* At this point we may have a template declared by a concept
14994 introduction. */
14999 else
15000 /* Try to parse a block-declaration, or a function-definition. */
15003 /* Free any declarators allocated. */
15005 }
15007 /* Parse a namespace-scope declaration. */
15009 static void
15011 {
15015 /* A top-level declaration can consist solely of a #pragma. A
15016 nested declaration cannot, so this is done here and not in
15017 cp_parser_declaration. (A #pragma at block scope is
15018 handled in cp_parser_statement.) */
15020 else
15021 /* Parse the declaration itself. */
15023 }
15025 /* Parse a block-declaration.
15027 block-declaration:
15028 simple-declaration
15029 asm-definition
15030 namespace-alias-definition
15031 using-declaration
15032 using-directive
15034 GNU Extension:
15036 block-declaration:
15037 __extension__ block-declaration
15039 C++0x Extension:
15041 block-declaration:
15042 static_assert-declaration
15044 If STATEMENT_P is TRUE, then this block-declaration is occurring as
15045 part of a declaration-statement. */
15047 static void
15050 {
15053 /* Check for the `__extension__' keyword. */
15055 {
15056 /* Parse the qualified declaration. */
15058 /* Restore the PEDANTIC flag. */
15062 }
15064 /* Peek at the next token to figure out which kind of declaration is
15065 present. */
15069 /* If the next keyword is `asm', we have an asm-definition. */
15071 {
15075 }
15076 /* If the next keyword is `namespace', we have a
15077 namespace-alias-definition. */
15080 /* If the next keyword is `using', we have a
15081 using-declaration, a using-directive, or an alias-declaration. */
15083 {
15088 /* If the token after `using' is `namespace', then we have a
15089 using-directive. */
15095 /* If the second token after 'using' is '=', then we have an
15096 alias-declaration. */
15102 /* Otherwise, it's a using-declaration. */
15103 else
15106 }
15107 /* If the next keyword is `__label__' we have a misplaced label
15108 declaration. */
15110 {
15114 /* If the next token is now a `;', consume it. */
15117 }
15118 /* If the next token is `static_assert' we have a static assertion. */
15121 /* If the next tokens after attributes is `using namespace', then we have
15122 a using-directive. */
15125 RID_USING)
15127 RID_NAMESPACE))
15128 {
15132 }
15133 /* Anything else must be a simple-declaration. */
15134 else
15137 }
15139 /* Parse a simple-declaration.
15141 simple-declaration:
15142 decl-specifier-seq [opt] init-declarator-list [opt] ;
15143 decl-specifier-seq ref-qualifier [opt] [ identifier-list ]
15144 brace-or-equal-initializer ;
15146 init-declarator-list:
15147 init-declarator
15148 init-declarator-list , init-declarator
15150 If FUNCTION_DEFINITION_ALLOWED_P is TRUE, then we also recognize a
15151 function-definition as a simple-declaration.
15153 If MAYBE_RANGE_FOR_DECL is not NULL, the pointed tree will be set to the
15154 parsed declaration if it is an uninitialized single declarator not followed
15155 by a `;', or to error_mark_node otherwise. Either way, the trailing `;',
15156 if present, will not be consumed. */
15158 static void
15162 {
15163 cp_decl_specifier_seq decl_specifiers;
15172 /* Defer access checks until we know what is being declared; the
15173 checks for names appearing in the decl-specifier-seq should be
15174 done as if we were in the scope of the thing being declared. */
15177 /* Parse the decl-specifier-seq. We have to keep track of whether
15178 or not the decl-specifier-seq declares a named class or
15179 enumeration type, since that is the only case in which the
15180 init-declarator-list is allowed to be empty.
15182 [dcl.dcl]
15184 In a simple-declaration, the optional init-declarator-list can be
15185 omitted only when declaring a class or enumeration, that is when
15186 the decl-specifier-seq contains either a class-specifier, an
15187 elaborated-type-specifier, or an enum-specifier. */
15189 CP_PARSER_FLAGS_OPTIONAL,
15192 /* We no longer need to defer access checks. */
15195 cp_omp_declare_simd_data odsd;
15201 /* In a block scope, a valid declaration must always have a
15202 decl-specifier-seq. By not trying to parse declarators, we can
15203 resolve the declaration/expression ambiguity more quickly. */
15206 {
15209 }
15211 /* If the next two tokens are both identifiers, the code is
15212 erroneous. The usual cause of this situation is code like:
15214 T t;
15216 where "T" should name a type -- but does not. */
15219 {
15220 /* If parsing tentatively, we should commit; we really are
15221 looking at a declaration. */
15223 /* Give up. */
15225 }
15229 /* Look for C++17 decomposition declaration. */
15237 {
15238 tree decl
15240 maybe_range_for_decl,
15243 /* The next token should be either a `,' or a `;'. */
15245 /* If it's a `;', we are done. */
15249 {
15253 }
15254 /* Anything else is an error. */
15255 else
15256 {
15257 /* If we have already issued an error message we don't need
15258 to issue another one. */
15263 /* Skip tokens until we reach the end of the statement. */
15265 /* If the next token is now a `;', consume it. */
15269 }
15270 }
15271 else
15274 tree last_type;
15276 /* NULL_TREE if both variable and function declaration are allowed,
15277 error_mark_node if function declaration are not allowed and
15278 a FUNCTION_DECL that should be diagnosed if it is followed by
15279 variable declarations. */
15280 tree auto_function_declaration;
15283 auto_specifier_p
15287 /* Keep going until we hit the `;' at the end of the simple
15288 declaration. */
15291 CPP_SEMICOLON))
15292 {
15295 tree decl;
15299 {
15300 /* If we are processing next declarator, comma is expected */
15305 {
15309 }
15310 }
15311 else
15314 /* Parse the init-declarator. */
15316 CP_PARSER_FLAGS_NONE,
15319 function_definition_allowed_p,
15321 declares_class_or_enum,
15323 maybe_range_for_decl,
15326 /* If an error occurred while parsing tentatively, exit quickly.
15327 (That usually happens when in the body of a function; each
15328 statement is treated as a declaration-statement until proven
15329 otherwise.) */
15334 {
15335 /* If the init-declarator-list contains more than one
15336 init-declarator, they shall all form declarations of
15337 variables. */
15339 auto_function_declaration
15343 {
15345 "non-variable %qD in declaration with more than one "
15350 }
15351 }
15355 {
15359 {
15360 /* If the list of declarators contains more than one declarator,
15361 the type of each declared variable is determined as described
15362 above. If the type deduced for the template parameter U is not
15363 the same in each deduction, the program is ill-formed. */
15368 }
15369 else
15371 }
15373 /* Handle function definitions specially. */
15375 {
15376 /* If the next token is a `,', then we are probably
15377 processing something like:
15379 void f() {}, *p;
15381 which is erroneous. */
15383 {
15386 "mixing"
15388 }
15389 /* Otherwise, we're done with the list of declarators. */
15390 else
15391 {
15395 }
15396 }
15399 /* The next token should be either a `,' or a `;'. */
15401 /* If it's a `,', there are more declarators to come. */
15404 /* If it's a `;', we are done. */
15408 {
15413 }
15414 /* Anything else is an error. */
15415 else
15416 {
15417 /* If we have already issued an error message we don't need
15418 to issue another one. */
15423 /* Skip tokens until we reach the end of the statement. */
15425 /* If the next token is now a `;', consume it. */
15429 }
15430 /* After the first time around, a function-definition is not
15431 allowed -- even if it was OK at first. For example:
15433 int i, f() {}
15435 is not valid. */
15437 }
15439 /* Issue an error message if no declarators are present, and the
15440 decl-specifier-seq does not itself declare a class or
15441 enumeration: [dcl.dcl]/3. */
15443 {
15445 {
15449 /* Ensure an error is issued anyway when finish_decltype_type,
15450 called via cp_parser_decl_specifier_seq, returns a class or
15451 an enumeration (c++/51786). */
15454 }
15455 /* Perform any deferred access checks. */
15457 }
15459 /* Consume the `;'. */
15460 finish:
15464 {
15470 }
15472 done:
15475 }
15477 /* Helper of cp_parser_simple_declaration, parse a decomposition declaration.
15478 decl-specifier-seq ref-qualifier [opt] [ identifier-list ]
15479 initializer ; */
15481 static tree
15486 {
15491 /* Parse the identifier-list. */
15495 {
15503 }
15507 {
15513 else
15514 {
15517 }
15518 }
15522 "structured bindings only available with "
15525 tree pushed_scope;
15532 NULL_TREE);
15539 cp_expr e;
15540 cp_decl_specifier_seq decl_specs;
15545 {
15549 else
15550 {
15553 }
15554 tree elt_pushed_scope;
15560 {
15561 /* Ensure we've diagnosed redeclaration if we aren't creating
15562 a new VAR_DECL. */
15565 }
15566 else
15570 }
15573 {
15576 }
15580 {
15588 || (is_direct_init
15591 {
15595 }
15598 {
15603 }
15604 }
15606 {
15608 /* Ensure DECL_VALUE_EXPR is created for all the decls but
15609 the underlying DECL. */
15611 }
15617 {
15620 }
15623 }
15625 /* Parse a decl-specifier-seq.
15627 decl-specifier-seq:
15628 decl-specifier-seq [opt] decl-specifier
15629 decl-specifier attribute-specifier-seq [opt] (C++11)
15631 decl-specifier:
15632 storage-class-specifier
15633 type-specifier
15634 function-specifier
15635 friend
15636 typedef
15638 GNU Extension:
15640 decl-specifier:
15641 attributes
15643 Concepts Extension:
15645 decl-specifier:
15646 concept
15648 Set *DECL_SPECS to a representation of the decl-specifier-seq.
15650 The parser flags FLAGS is used to control type-specifier parsing.
15652 *DECLARES_CLASS_OR_ENUM is set to the bitwise or of the following
15653 flags:
15655 1: one of the decl-specifiers is an elaborated-type-specifier
15656 (i.e., a type declaration)
15657 2: one of the decl-specifiers is an enum-specifier or a
15658 class-specifier (i.e., a type definition)
15660 */
15662 static void
15664 cp_parser_flags flags,
15667 {
15671 cp_decl_spec ds;
15673 /* Clear DECL_SPECS. */
15676 /* Assume no class or enumeration type is declared. */
15679 /* Keep reading specifiers until there are no more to read. */
15681 {
15686 /* Peek at the next token. */
15689 /* Save the first token of the decl spec list for error
15690 reporting. */
15693 /* Handle attributes. */
15696 {
15697 /* Parse the attributes. */
15700 /* In a sequence of declaration specifiers, c++11 attributes
15701 appertain to the type that precede them. In that case
15702 [dcl.spec]/1 says:
15704 The attribute-specifier-seq affects the type only for
15705 the declaration it appears in, not other declarations
15706 involving the same type.
15708 But for now let's force the user to position the
15709 attribute either at the beginning of the declaration or
15710 after the declarator-id, which would clearly mean that it
15711 applies to the declarator. */
15713 {
15715 /* The c++11 attribute is at the beginning of the
15716 declaration. It appertains to the entity being
15718 else
15719 {
15721 {
15722 /* This is an attribute following a
15723 class-specifier. */
15728 }
15729 else
15730 {
15731 decl_specs->std_attributes
15735 }
15737 }
15738 }
15740 decl_specs->attributes
15745 }
15746 /* Assume we will find a decl-specifier keyword. */
15748 /* If the next token is an appropriate keyword, we can simply
15749 add it to the list. */
15751 {
15752 /* decl-specifier:
15753 friend
15754 constexpr
15755 constinit */
15758 {
15763 }
15764 else
15765 {
15767 /* Consume the token. */
15769 }
15794 /* Warn for concept as a decl-specifier. We'll rewrite these as
15795 concept declarations later. */
15797 {
15802 else
15805 }
15807 /* In C++20 a concept definition is just 'concept name = expr;'
15808 Support that syntax as a TS extension by pretending we've seen
15809 the 'bool' specifier. */
15813 {
15817 }
15820 /* function-specifier:
15821 inline
15822 virtual
15823 explicit */
15830 /* decl-specifier:
15831 typedef */
15834 /* Consume the token. */
15840 /* A constructor declarator cannot appear in a typedef. */
15842 /* The "typedef" keyword can only occur in a declaration; we
15843 may as well commit at this point. */
15850 /* storage-class-specifier:
15851 auto
15852 register
15853 static
15854 extern
15855 mutable
15857 GNU Extension:
15858 thread */
15861 {
15862 /* Consume the token. */
15865 /* Complain about `auto' as a storage specifier, if
15866 we're complaining about C++0x compatibility. */
15870 "%<auto%> changes meaning in C++11; "
15873 /* Set the storage class anyway. */
15875 token);
15876 }
15877 else
15878 /* C++0x auto type-specifier. */
15886 /* Consume the token. */
15889 token);
15892 /* Consume the token. */
15898 /* We did not yet find a decl-specifier yet. */
15901 }
15919 /* Constructors are a special case. The `S' in `S()' is not a
15920 decl-specifier; it is the beginning of the declarator. */
15921 constructor_p
15922 = (!found_decl_spec
15923 && constructor_possible_p
15924 && (cp_parser_constructor_declarator_p
15926 ds_friend))));
15928 /* If we don't have a DECL_SPEC yet, then we must be looking at
15929 a type-specifier. */
15931 {
15934 tree type_spec;
15939 type_spec
15941 decl_specs,
15947 /* If this type-specifier referenced a user-defined type
15948 (a typedef, class-name, etc.), then we can't allow any
15949 more such type-specifiers henceforth.
15951 [dcl.spec]
15953 The longest sequence of decl-specifiers that could
15954 possibly be a type name is taken as the
15955 decl-specifier-seq of a declaration. The sequence shall
15956 be self-consistent as described below.
15958 [dcl.type]
15960 As a general rule, at most one type-specifier is allowed
15961 in the complete decl-specifier-seq of a declaration. The
15962 only exceptions are the following:
15964 -- const or volatile can be combined with any other
15965 type-specifier.
15967 -- signed or unsigned can be combined with char, long,
15968 short, or int.
15970 -- ..
15972 Example:
15974 typedef char* Pc;
15975 void g (const int Pc);
15977 Here, Pc is *not* part of the decl-specifier seq; it's
15978 the declarator. Therefore, once we see a type-specifier
15979 (other than a cv-qualifier), we forbid any additional
15980 user-defined types. We *do* still allow things like `int
15981 int' to be considered a decl-specifier-seq, and issue the
15982 error message later. */
15985 /* A constructor declarator cannot follow a type-specifier. */
15987 {
15995 }
15996 }
15998 /* If we still do not have a DECL_SPEC, then there are no more
15999 decl-specifiers. */
16004 {
16008 "standard attributes must precede the decl-specifiers to "
16009 "apply to the declaration, or follow them to apply to "
16011 }
16014 /* After we see one decl-specifier, further decl-specifiers are
16015 always optional. */
16017 }
16019 /* Don't allow a friend specifier with a class definition. */
16024 }
16026 /* Parse an (optional) storage-class-specifier.
16028 storage-class-specifier:
16029 auto
16030 register
16031 static
16032 extern
16033 mutable
16035 GNU Extension:
16037 storage-class-specifier:
16038 thread
16040 Returns an IDENTIFIER_NODE corresponding to the keyword used. */
16042 static tree
16044 {
16046 {
16050 /* Fall through for C++98. */
16058 /* Consume the token. */
16063 }
16064 }
16066 /* Parse an (optional) function-specifier.
16068 function-specifier:
16069 inline
16070 virtual
16071 explicit
16073 C++20 Extension:
16074 explicit(constant-expression)
16076 Returns an IDENTIFIER_NODE corresponding to the keyword used.
16077 Updates DECL_SPECS, if it is non-NULL. */
16079 static tree
16082 {
16085 {
16091 /* 14.5.2.3 [temp.mem]
16093 A member function template shall not be virtual. */
16097 else
16102 {
16104 /* If we see '(', it's C++20 explicit(bool). */
16105 tree expr;
16107 {
16108 matching_parens parens;
16111 /* New types are not allowed in an explicit-specifier. */
16114 parser->type_definition_forbidden_message
16119 "%<explicit(bool)%> only available with %<-std=c++20%> "
16122 /* Parse the constant-expression. */
16125 /* Restore the saved message. */
16128 }
16129 else
16130 /* The explicit-specifier explicit without a constant-expression is
16131 equivalent to the explicit-specifier explicit(true). */
16134 /* [dcl.fct.spec]
16135 "the constant-expression, if supplied, shall be a contextually
16136 converted constant expression of type bool." */
16138 /* We could evaluate it -- mark the decl as appropriate. */
16144 /* The expression was value-dependent. Remember it so that we can
16145 substitute it later. */
16148 }
16152 }
16154 /* Consume the token. */
16156 }
16158 /* Parse a linkage-specification.
16160 linkage-specification:
16161 extern string-literal { declaration-seq [opt] }
16162 extern string-literal declaration */
16164 static void
16166 {
16167 tree linkage;
16169 /* Look for the `extern' keyword. */
16170 cp_token *extern_token
16173 /* Look for the string-literal. */
16177 /* Transform the literal into an identifier. If the literal is a
16178 wide-character string, or contains embedded NULs, then we can't
16179 handle it as the user wants. */
16183 {
16185 /* Assume C++ linkage. */
16187 }
16188 else
16191 /* We're now using the new linkage. */
16196 /* Preserve the location of the innermost linkage specification,
16197 tracking the locations of nested specifications via a local. */
16198 location_t saved_location
16200 /* Construct a location ranging from the start of the "extern" to
16201 the end of the string-literal, with the caret at the start, e.g.:
16202 extern "C" {
16203 ^~~~~~~~~~
16204 */
16205 parser->innermost_linkage_specification_location
16210 /* If the next token is a `{', then we're using the first
16211 production. */
16213 {
16217 /* Consume the `{' token. */
16218 matching_braces braces;
16220 /* Parse the declarations. */
16222 /* Look for the closing `}'. */
16224 }
16225 /* Otherwise, there's just one declaration. */
16226 else
16227 {
16230 saved_in_unbraced_linkage_specification_p
16234 parser->in_unbraced_linkage_specification_p
16236 }
16238 /* We're done with the linkage-specification. */
16242 /* Restore location of parent linkage specification, if any. */
16244 }
16246 /* Parse a static_assert-declaration.
16248 static_assert-declaration:
16249 static_assert ( constant-expression , string-literal ) ;
16250 static_assert ( constant-expression ) ; (C++17)
16252 If MEMBER_P, this static_assert is a class member. */
16254 static void
16256 {
16257 cp_expr condition;
16258 location_t token_loc;
16259 tree message;
16262 /* Peek at the `static_assert' token so we can keep track of exactly
16263 where the static assertion started. */
16266 /* Look for the `static_assert' keyword. */
16268 RT_STATIC_ASSERT))
16271 /* We know we are in a static assertion; commit to any tentative
16272 parse. */
16276 /* Parse the `(' starting the static assertion condition. */
16277 matching_parens parens;
16280 /* Parse the constant-expression. Allow a non-constant expression
16281 here in order to give better diagnostics in finish_static_assert. */
16282 condition =
16288 {
16291 "%<static_assert%> without a message "
16293 /* Eat the ')' */
16298 }
16299 else
16300 {
16301 /* Parse the separating `,'. */
16304 /* Parse the string-literal message. */
16309 /* A `)' completes the static assertion. */
16315 }
16317 /* A semicolon terminates the declaration. */
16320 /* Get the location for the static assertion. Use that of the
16321 condition if available, otherwise, use that of the "static_assert"
16322 token. */
16327 /* Complete the static assertion, which may mean either processing
16328 the static assert now or saving it for template instantiation. */
16331 }
16333 /* Parse the expression in decltype ( expression ). */
16335 static tree
16338 {
16340 tree expr;
16342 /* First, try parsing an id-expression. */
16353 {
16356 cp_id_kind idk;
16360 /* Lookup the name we got back from the id-expression. */
16365 /* A template without args is not a complete id-expression. */
16374 {
16375 /* Complete lookup of the id-expression. */
16376 expr = (finish_id_expression
16389 /* We found an id-expression, but it was something that we
16390 should not have found. This is an error, not something
16391 we can recover from, so note that we found an
16392 id-expression and we'll recover as gracefully as
16393 possible. */
16395 }
16400 /* We have an id-expression. */
16402 }
16405 {
16406 /* Abort the id-expression parse. */
16409 /* Parsing tentatively, again. */
16412 /* Parse a class member access. */
16420 /* We have an id-expression. */
16422 }
16425 /* We have parsed the complete id-expression or member access. */
16427 else
16428 {
16429 /* Abort our attempt to parse an id-expression or member access
16430 expression. */
16433 /* Parse a full expression. */
16436 }
16439 }
16441 /* Parse a `decltype' type. Returns the type.
16443 decltype-specifier:
16444 decltype ( expression )
16445 C++14:
16446 decltype ( auto ) */
16448 static tree
16450 {
16455 {
16456 /* Already parsed. */
16459 }
16461 /* Look for the `decltype' token. */
16465 /* Parse the opening `('. */
16466 matching_parens parens;
16470 /* Since we're going to preserve any side-effects from this parse, set up a
16471 firewall to protect our callers from cp_parser_commit_to_tentative_parse
16472 in the expression. */
16475 /* If in_declarator_p, a reparse as an expression might succeed (60361).
16476 Otherwise, commit now for better diagnostics. */
16487 {
16488 /* decltype (auto) */
16491 {
16493 "%<decltype(auto)%> type specifier only available with "
16496 }
16497 }
16498 else
16499 {
16500 /* decltype (expression) */
16502 /* Types cannot be defined in a `decltype' expression. Save away the
16503 old message and set the new one. */
16505 parser->type_definition_forbidden_message
16508 /* The restrictions on constant-expressions do not apply inside
16509 decltype expressions. */
16510 bool saved_integral_constant_expression_p
16512 bool saved_non_integral_constant_expression_p
16516 /* Within a parenthesized expression, a `>' token is always
16517 the greater-than operator. */
16518 bool saved_greater_than_is_operator_p
16522 /* Don't synthesize an implicit template type parameter here. This
16523 could happen with C++23 code like
16525 void f(decltype(new auto{0}));
16527 where we want to deduce the auto right away so that the parameter
16528 is of type 'int *'. */
16532 /* Do not actually evaluate the expression. */
16535 /* Do not warn about problems with the expression. */
16541 /* Go back to evaluating expressions. */
16545 /* The `>' token might be the end of a template-id or
16546 template-parameter-list now. */
16547 parser->greater_than_is_operator_p
16550 /* Restore the old message and the integral constant expression
16551 flags. */
16553 parser->integral_constant_expression_p
16555 parser->non_integral_constant_expression_p
16557 }
16559 /* Parse to the closing `)'. */
16561 {
16565 }
16567 /* If we got a parse error while tentative, bail out now. */
16569 {
16572 }
16575 /* Build auto. */
16577 else
16579 tf_warning_or_error);
16581 /* Replace the decltype with a CPP_DECLTYPE so we don't need to parse
16582 it again. */
16599 }
16601 /* Special member functions [gram.special] */
16603 /* Parse a conversion-function-id.
16605 conversion-function-id:
16606 operator conversion-type-id
16608 Returns an IDENTIFIER_NODE representing the operator. */
16610 static tree
16612 {
16613 tree type;
16614 tree saved_scope;
16615 tree saved_qualifying_scope;
16616 tree saved_object_scope;
16619 /* Look for the `operator' token. */
16622 /* When we parse the conversion-type-id, the current scope will be
16623 reset. However, we need that information in able to look up the
16624 conversion function later, so we save it here. */
16628 /* We must enter the scope of the class so that the names of
16629 entities declared within the class are available in the
16630 conversion-type-id. For example, consider:
16632 struct S {
16633 typedef int I;
16634 operator I();
16635 };
16637 S::operator I() { ... }
16639 In order to see that `I' is a type-name in the definition, we
16640 must be in the scope of `S'. */
16643 /* Parse the conversion-type-id. */
16645 /* Leave the scope of the class, if any. */
16648 /* Restore the saved scope. */
16652 /* If the TYPE is invalid, indicate failure. */
16656 }
16658 /* Parse a conversion-type-id:
16660 conversion-type-id:
16661 type-specifier-seq conversion-declarator [opt]
16663 Returns the TYPE specified. */
16665 static tree
16667 {
16668 tree attributes;
16669 cp_decl_specifier_seq type_specifiers;
16671 tree type_specified;
16674 /* Parse the attributes. */
16678 parser->type_definition_forbidden_message
16681 /* Parse the type-specifiers. DR 2413 clarifies that `typename' is
16682 optional in conversion-type-id. */
16690 /* If that didn't work, stop. */
16693 /* Parse the conversion-declarator. */
16701 /* Don't give this error when parsing tentatively. This happens to
16702 work because we always parse this definitively once. */
16705 {
16707 {
16710 }
16714 }
16717 }
16719 /* Parse an (optional) conversion-declarator.
16721 conversion-declarator:
16722 ptr-operator conversion-declarator [opt]
16724 */
16728 {
16731 cp_cv_quals cv_quals;
16733 /* We don't know if there's a ptr-operator next, or not. */
16735 /* Try the ptr-operator. */
16738 /* If it worked, look for more conversion-declarators. */
16740 {
16743 /* Parse another optional declarator. */
16746 declarator = cp_parser_make_indirect_declarator
16750 }
16753 }
16755 /* Parse an (optional) ctor-initializer.
16757 ctor-initializer:
16758 : mem-initializer-list */
16760 static void
16762 {
16763 /* If the next token is not a `:', then there is no
16764 ctor-initializer. */
16766 {
16767 /* Do default initialization of any bases and members. */
16771 }
16773 /* Consume the `:' token. */
16775 /* And the mem-initializer-list. */
16777 }
16779 /* Parse a mem-initializer-list.
16781 mem-initializer-list:
16782 mem-initializer ... [opt]
16783 mem-initializer ... [opt] , mem-initializer-list */
16785 static void
16787 {
16792 /* Let the semantic analysis code know that we are starting the
16793 mem-initializer-list. */
16798 /* Loop through the list. */
16800 {
16801 tree mem_initializer;
16804 /* Parse the mem-initializer. */
16806 /* If the next token is a `...', we're expanding member initializers. */
16812 {
16813 /* Consume the `...'. */
16817 /* The TREE_PURPOSE must be a _TYPE, because base-specifiers
16818 can be expanded but members cannot. */
16821 {
16826 }
16828 /* Construct the pack expansion type. */
16831 }
16834 {
16838 }
16839 /* Look for a target constructor. */
16843 {
16846 {
16850 }
16852 }
16853 /* Add it to the list, unless it was erroneous. */
16855 {
16858 }
16859 /* If the next token is not a `,', we're done. */
16862 /* Consume the `,' token. */
16864 }
16866 /* Perform semantic analysis. */
16869 }
16871 /* Parse a mem-initializer.
16873 mem-initializer:
16874 mem-initializer-id ( expression-list [opt] )
16875 mem-initializer-id braced-init-list
16877 GNU extension:
16879 mem-initializer:
16880 ( expression-list [opt] )
16882 Returns a TREE_LIST. The TREE_PURPOSE is the TYPE (for a base
16883 class) or FIELD_DECL (for a non-static data member) to initialize;
16884 the TREE_VALUE is the expression-list. An empty initialization
16885 list is represented by void_list_node. */
16887 static tree
16889 {
16890 tree mem_initializer_id;
16891 tree expression_list;
16892 tree member;
16895 /* Find out what is being initialized. */
16897 {
16901 }
16902 else
16903 {
16907 }
16913 {
16920 }
16921 else
16922 {
16934 }
16947 /* We can't attach the source location of this initializer directly to
16948 the list node, so we instead attach it to a dummy EMPTY_CLASS_EXPR
16949 within the TREE_TYPE of the list node. */
16950 location_t loc
16957 }
16959 /* Parse a mem-initializer-id.
16961 mem-initializer-id:
16962 :: [opt] nested-name-specifier [opt] class-name
16963 decltype-specifier (C++11)
16964 identifier
16966 Returns a TYPE indicating the class to be initialized for the first
16967 production (and the second in C++11). Returns an IDENTIFIER_NODE
16968 indicating the data member to be initialized for the last production. */
16970 static tree
16972 {
16976 tree id;
16980 /* `typename' is not allowed in this context ([temp.res]). */
16982 {
16984 "keyword %<typename%> not allowed in this context (a qualified "
16987 }
16988 /* Look for the optional `::' operator. */
16989 global_scope_p
16993 /* Look for the optional nested-name-specifier. The simplest way to
16994 implement:
16996 [temp.res]
16998 The keyword `typename' is not permitted in a base-specifier or
16999 mem-initializer; in these contexts a qualified name that
17000 depends on a template-parameter is implicitly assumed to be a
17001 type name.
17003 is to assume that we have seen the `typename' keyword at this
17004 point. */
17005 nested_name_specifier_p
17014 /* If there is a `::' operator or a nested-name-specifier, then we
17015 are definitely looking for a class-name. */
17020 typename_type,
17024 /* Otherwise, we could also be looking for an ordinary identifier. */
17027 /* Try a decltype-specifier. */
17029 else
17030 /* Otherwise, try a class-name. */
17034 none_type,
17038 /* If we found one, we're done. */
17041 /* Otherwise, look for an ordinary identifier. */
17043 }
17045 /* Overloading [gram.over] */
17047 /* Parse an operator-function-id.
17049 operator-function-id:
17050 operator operator
17052 Returns an IDENTIFIER_NODE for the operator which is a
17053 human-readable spelling of the identifier, e.g., `operator +'. */
17055 static cp_expr
17057 {
17059 /* Look for the `operator' keyword. */
17062 /* And then the name of the operator itself. */
17064 }
17066 /* Return an identifier node for a user-defined literal operator.
17067 The suffix identifier is chained to the operator name identifier. */
17069 tree
17071 {
17072 tree identifier;
17080 }
17082 /* Parse an operator.
17084 operator:
17085 new delete new[] delete[] + - * / % ^ & | ~ ! = < >
17086 += -= *= /= %= ^= &= |= << >> >>= <<= == != <= >= &&
17087 || ++ -- , ->* -> () []
17089 GNU Extensions:
17091 operator:
17092 <? >? <?= >?=
17094 Returns an IDENTIFIER_NODE for the operator which is a
17095 human-readable spelling of the identifier, e.g., `operator +'. */
17097 static cp_expr
17099 {
17104 /* Peek at the next token. */
17109 /* Figure out which operator we have. */
17114 {
17116 {
17117 /* The keyword should be either `new', `delete' or `co_await'. */
17124 else
17127 /* Consume the `new', `delete' or co_await token. */
17130 /* Peek at the next token. */
17132 /* If it's a `[' token then this is the array variant of the
17133 operator. */
17136 {
17137 /* Consume the `[' token. */
17139 /* Look for the `]' token. */
17144 }
17147 }
17310 /* Consume the `?'. */
17312 /* Look for the matching `:'. */
17318 {
17319 /* Consume the `('. */
17320 matching_parens parens;
17322 /* Look for the matching `)'. */
17329 }
17332 /* Consume the `['. */
17334 /* Look for the matching `]'. */
17345 /* FALLTHRU */
17354 {
17355 cp_expr str;
17356 tree string_tree;
17362 /* Consume the string. */
17368 {
17372 }
17373 else
17374 {
17376 /* Look for the suffix identifier. */
17379 {
17382 }
17384 {
17388 }
17389 else
17390 {
17393 }
17394 }
17399 {
17402 }
17405 {
17408 }
17410 {
17413 }
17414 /* Generate a location of the form:
17415 "" _suffix_identifier
17416 ^~~~~~~~~~~~~~~~~~~~~
17417 with caret == start at the start token, finish at the end of the
17418 suffix identifier. */
17419 location_t combined_loc
17422 }
17425 /* Anything else is an error. */
17427 }
17429 /* If we have selected an identifier, we need to consume the
17430 operator token. */
17432 {
17436 }
17437 /* Otherwise, no valid operator name was present. */
17438 else
17439 {
17442 }
17446 }
17448 /* Parse a template-declaration.
17450 template-declaration:
17451 export [opt] template < template-parameter-list > declaration
17453 If MEMBER_P is TRUE, this template-declaration occurs within a
17454 class-specifier.
17456 The grammar rule given by the standard isn't correct. What
17457 is really meant is:
17459 template-declaration:
17460 export [opt] template-parameter-list-seq
17461 decl-specifier-seq [opt] init-declarator [opt] ;
17462 export [opt] template-parameter-list-seq
17463 function-definition
17465 template-parameter-list-seq:
17466 template-parameter-list-seq [opt]
17467 template < template-parameter-list >
17469 Concept Extensions:
17471 template-parameter-list-seq:
17472 template < template-parameter-list > requires-clause [opt]
17474 requires-clause:
17475 requires logical-or-expression */
17477 static void
17479 {
17480 /* Check for `export'. */
17482 {
17483 /* Consume the `export' token. */
17485 /* Warn that this use of export is deprecated. */
17490 else
17492 }
17495 }
17497 /* Parse a template-parameter-list.
17499 template-parameter-list:
17500 template-parameter
17501 template-parameter-list , template-parameter
17503 Returns a TREE_LIST. Each node represents a template parameter.
17504 The nodes are connected via their TREE_CHAINs. */
17506 static tree
17508 {
17511 /* Don't create wrapper nodes within a template-parameter-list,
17512 since we don't want to have different types based on the
17513 spelling location of constants and decls within them. */
17514 auto_suppress_location_wrappers sentinel;
17518 /* The loop below parses the template parms. We first need to know
17519 the total number of template parms to be able to compute proper
17520 canonical types of each dependent type. So after the loop, when
17521 we know the total number of template parms,
17522 end_template_parm_list computes the proper canonical types and
17523 fixes up the dependent types accordingly. */
17525 {
17526 tree parameter;
17529 location_t parm_loc;
17531 /* Parse the template-parameter. */
17536 /* Add it to the list. */
17539 parm_loc,
17540 parameter,
17541 is_non_type,
17542 is_parameter_pack);
17543 else
17544 {
17547 }
17549 /* If the next token is not a `,', we're done. */
17552 /* Otherwise, consume the `,' token. */
17554 }
17557 }
17559 /* Parse a introduction-list.
17561 introduction-list:
17562 introduced-parameter
17563 introduction-list , introduced-parameter
17565 introduced-parameter:
17566 ...[opt] identifier
17568 Returns a TREE_VEC of WILDCARD_DECLs. If the parameter is a pack
17569 then the introduced parm will have WILDCARD_PACK_P set. In addition, the
17570 WILDCARD_DECL will also have DECL_NAME set and token location in
17571 DECL_SOURCE_LOCATION. */
17573 static tree
17575 {
17579 {
17588 /* Build placeholder. */
17596 /* If the next token is not a `,', we're done. */
17599 /* Otherwise, consume the `,' token. */
17601 }
17603 /* Convert the vec into a TREE_VEC. */
17606 tree parm;
17612 }
17614 /* Given a declarator, get the declarator-id part, or NULL_TREE if this
17615 is an abstract declarator. */
17619 {
17624 }
17626 /* Get the unqualified-id from the DECLARATOR or NULL_TREE if this
17627 is an abstract declarator. */
17631 {
17635 else
17637 }
17639 /* Returns true if TYPE would declare a constrained constrained-parameter. */
17643 {
17648 }
17650 /* Returns true if PARM declares a constrained-parameter. */
17654 {
17656 }
17658 /* Check that the type parameter is only a declarator-id, and that its
17659 type is not cv-qualified. */
17661 bool
17664 {
17669 {
17672 }
17674 /* Don't allow cv-qualified type parameters. */
17677 {
17680 }
17683 }
17685 /* Finish parsing/processing a template type parameter and checking
17686 various restrictions. */
17690 tree id,
17692 {
17695 else
17697 }
17699 static tree
17701 {
17702 /* FIXME: This should probably be copied, and we may need to adjust
17703 the template parameter depths. */
17713 }
17715 /* Finish parsing/processing a template template parameter by borrowing
17716 the template parameter list from the prototype parameter. */
17718 static tree
17720 tree proto,
17721 tree id,
17723 {
17727 }
17729 /* Create a new non-type template parameter from the given PARM
17730 declarator. */
17732 static tree
17735 {
17741 }
17743 /* Build a constrained template parameter based on the PARMDECL
17744 declarator. The type of PARMDECL is the constrained type, which
17745 refers to the prototype template parameter that ultimately
17746 specifies the type of the declared parameter. */
17748 static tree
17752 {
17758 /* Build the parameter. Return an error if the declarator was invalid. */
17759 tree parm;
17764 parmdecl);
17765 else
17770 /* Finish the parameter decl and create a node attaching the
17771 default argument and constraint. */
17776 }
17778 /* Returns true if the parsed type actually represents the declaration
17779 of a type template-parameter. */
17781 static bool
17783 {
17786 }
17788 /* Returns true if the parsed type actually represents the declaration of
17789 a template template-parameter. */
17791 static bool
17793 {
17796 }
17798 /* Parse a default argument for a type template-parameter.
17799 Note that diagnostics are handled in cp_parser_template_parameter. */
17801 static tree
17803 {
17806 /* Consume the `=' token. */
17811 /* Tell cp_parser_lambda_expression this is a default argument. */
17815 /* Parse the default-argument. */
17818 CP_PARSER_FLAGS_TYPENAME_OPTIONAL,
17819 NULL);
17823 {
17827 }
17830 }
17832 /* Parse a default argument for a template template-parameter. */
17834 static tree
17836 {
17841 /* Consume the `='. */
17843 /* Parse the id-expression. */
17845 /* save token before parsing the id-expression, for error
17846 reporting */
17848 tree default_argument
17856 /* If the id-expression was a template-id that refers to
17857 a template-class, we already have the declaration here,
17858 so no further lookup is needed. */
17859 ;
17860 else
17861 /* Look up the name. */
17862 default_argument
17864 none_type,
17870 /* See if the default argument is valid. */
17874 }
17876 /* Parse a template-parameter.
17878 template-parameter:
17879 type-parameter
17880 parameter-declaration
17882 If all goes well, returns a TREE_LIST. The TREE_VALUE represents
17883 the parameter. The TREE_PURPOSE is the default value, if any.
17884 Returns ERROR_MARK_NODE on failure. *IS_NON_TYPE is set to true
17885 iff this parameter is a non-type parameter. *IS_PARAMETER_PACK is
17886 set to true iff this parameter is a parameter pack. */
17888 static tree
17891 {
17894 tree parm;
17896 /* Assume it is a type parameter or a template parameter. */
17898 /* Assume it not a parameter pack. */
17900 /* Peek at the next token. */
17902 /* If it is `template', we have a type-parameter. */
17905 /* If it is `class' or `typename' we do not know yet whether it is a
17906 type parameter or a non-type parameter. Consider:
17908 template <typename T, typename T::X X> ...
17910 or:
17912 template <class C, class D*> ...
17914 Here, the first parameter is a type parameter, and the second is
17915 a non-type parameter. We can tell by looking at the token after
17916 the identifier -- if it is a `,', `=', or `>' then we have a type
17917 parameter. */
17919 {
17920 /* Peek at the token after `class' or `typename'. */
17922 /* If it's an ellipsis, we have a template type parameter
17923 pack. */
17926 /* If it's an identifier, skip it. */
17929 /* Now, see if the token looks like the end of a template
17930 parameter. */
17935 }
17937 /* Otherwise, it is a non-type parameter or a constrained parameter.
17939 [temp.param]
17941 When parsing a default template-argument for a non-type
17942 template-parameter, the first non-nested `>' is taken as the end
17943 of the template parameter-list rather than a greater-than
17944 operator. */
17945 parameter_declarator
17947 CP_PARSER_FLAGS_TYPENAME_OPTIONAL,
17954 /* If the parameter declaration is marked as a parameter pack, set
17955 *IS_PARAMETER_PACK to notify the caller. */
17960 {
17961 /* Can happen in some cases of erroneous input (c++/34892). */
17963 /* Consume the `...' for better error recovery. */
17965 }
17967 /* The parameter may have been constrained type parameter. */
17970 parameter_declarator,
17971 is_non_type);
17973 // Now we're sure that the parameter is a non-type parameter.
17984 }
17986 /* Parse a type-parameter.
17988 type-parameter:
17989 class identifier [opt]
17990 class identifier [opt] = type-id
17991 typename identifier [opt]
17992 typename identifier [opt] = type-id
17993 template < template-parameter-list > class identifier [opt]
17994 template < template-parameter-list > class identifier [opt]
17995 = id-expression
17997 GNU Extension (variadic templates):
17999 type-parameter:
18000 class ... identifier [opt]
18001 typename ... identifier [opt]
18003 Returns a TREE_LIST. The TREE_VALUE is itself a TREE_LIST. The
18004 TREE_PURPOSE is the default-argument, if any. The TREE_VALUE is
18005 the declaration of the parameter.
18007 Sets *IS_PARAMETER_PACK if this is a template parameter pack. */
18009 static tree
18011 {
18013 tree parameter;
18015 /* Look for a keyword to tell us what kind of parameter this is. */
18021 {
18024 {
18025 tree identifier;
18026 tree default_argument;
18028 /* If the next token is an ellipsis, we have a template
18029 argument pack. */
18031 {
18032 /* Consume the `...' token. */
18037 }
18039 /* If the next token is an identifier, then it names the
18040 parameter. */
18043 else
18046 /* Create the parameter. */
18049 /* If the next token is an `=', we have a default argument. */
18051 {
18052 default_argument
18055 /* Template parameter packs cannot have default
18056 arguments. */
18058 {
18061 "template parameter pack %qD cannot have a "
18063 else
18065 "template parameter packs cannot have "
18068 }
18071 }
18072 else
18075 /* Create the combined representation of the parameter and the
18076 default argument. */
18078 }
18082 {
18083 tree identifier;
18084 tree default_argument;
18086 /* Look for the `<'. */
18088 /* Parse the template-parameter-list. */
18090 /* Look for the `>'. */
18093 /* If template requirements are present, parse them. */
18095 {
18100 }
18102 /* Look for the `class' or 'typename' keywords. */
18104 /* If the next token is an ellipsis, we have a template
18105 argument pack. */
18107 {
18108 /* Consume the `...' token. */
18113 }
18114 /* If the next token is an `=', then there is a
18115 default-argument. If the next token is a `>', we are at
18116 the end of the parameter-list. If the next token is a `,',
18117 then we are at the end of this parameter. */
18121 {
18123 /* Treat invalid names as if the parameter were nameless. */
18126 }
18127 else
18130 /* Create the template parameter. */
18132 identifier);
18134 /* If the next token is an `=', then there is a
18135 default-argument. */
18137 {
18138 default_argument
18141 /* Template parameter packs cannot have default
18142 arguments. */
18144 {
18147 "template parameter pack %qD cannot "
18149 identifier);
18150 else
18154 }
18155 }
18156 else
18159 /* Create the combined representation of the parameter and the
18160 default argument. */
18162 }
18168 }
18171 }
18173 /* Parse a template-id.
18175 template-id:
18176 template-name < template-argument-list [opt] >
18178 If TEMPLATE_KEYWORD_P is TRUE, then we have just seen the
18179 `template' keyword. In this case, a TEMPLATE_ID_EXPR will be
18180 returned. Otherwise, if the template-name names a function, or set
18181 of functions, returns a TEMPLATE_ID_EXPR. If the template-name
18182 names a class, returns a TYPE_DECL for the specialization.
18184 If CHECK_DEPENDENCY_P is FALSE, names are looked up in
18185 uninstantiated templates. */
18187 static tree
18193 {
18194 tree templ;
18195 tree arguments;
18196 tree template_id;
18201 /* If the next token corresponds to a template-id, there is no need
18202 to reparse it. */
18206 {
18209 }
18211 /* Avoid performing name lookup if there is no possibility of
18212 finding a template-id. */
18215 && !cp_parser_nth_token_starts_template_argument_list_p
18217 {
18220 }
18222 /* Remember where the template-id starts. */
18228 /* Parse the template-name. */
18231 check_dependency_p,
18232 is_declaration,
18233 tag_type,
18236 /* Push any access checks inside the firewall we're about to create. */
18242 /* Since we're going to preserve any side-effects from this parse, set up a
18243 firewall to protect our callers from cp_parser_commit_to_tentative_parse
18244 in the template arguments. */
18248 /* If we find the sequence `[:' after a template-name, it's probably
18249 a digraph-typo for `< ::'. Substitute the tokens and check if we can
18250 parse correctly the argument list. */
18257 {
18259 /* Change `:' into `::'. */
18261 /* Consume the first token (CPP_OPEN_SQUARE - which we pretend it is
18262 CPP_LESS. */
18265 /* Parse the arguments. */
18268 {
18269 /* If we couldn't parse an argument list, then we revert our changes
18270 and return simply an error. Maybe this is not a template-id
18271 after all. */
18276 }
18277 /* Otherwise, emit an error about the invalid digraph, but continue
18278 parsing because we got our argument list. */
18281 {
18284 "%<<:%> is an alternate spelling for %<[%>."
18287 {
18289 "or %<-std=c++11%>, or %<-std=gnu++11%> G++ will "
18292 }
18293 }
18294 }
18295 else
18296 {
18297 /* Look for the `<' that starts the template-argument-list. */
18299 {
18302 }
18303 /* Parse the arguments. */
18308 && !template_keyword_p
18311 {
18312 /* This didn't go well. */
18314 {
18315 /* C++20 says that "function-name < a;" is now ill-formed. */
18317 {
18320 "operand of %<<%> is ill-formed in C++20; wrap the "
18322 }
18323 else
18324 /* We expect "f<targs>" to be followed by "(args)". */
18328 /* Purge all subsequent tokens. */
18330 }
18331 else
18335 }
18336 }
18338 /* Set the location to be of the form:
18339 template-name < template-argument-list [opt] >
18340 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
18341 with caret == start at the start of the template-name,
18342 ranging until the closing '>'. */
18343 location_t combined_loc
18346 /* Check for concepts autos where they don't belong. We could
18347 identify types in some cases of identifier TEMPL, looking ahead
18348 for a CPP_SCOPE, but that would buy us nothing: we accept auto in
18349 types. We reject them in functions, but if what we have is an
18350 identifier, even with none_type we can't conclude it's NOT a
18351 type, we have to wait for template substitution. */
18354 /* Build a representation of the specialization. */
18357 TEMPLATE_ID_EXPR,
18361 {
18362 /* In "template <typename T> ... A<T>::", A<T> is the abstract A
18363 template (rather than some instantiation thereof) only if
18364 is not nested within some other construct. For example, in
18365 "template <typename T> void f(T) { A<T>::", A<T> is just an
18366 instantiation of A. */
18367 bool entering_scope
18370 template_id
18372 }
18374 {
18375 /* The caller will decide whether this is a concept check or type
18376 constraint. */
18379 }
18381 {
18385 }
18388 {
18389 /* Some type template in dependent scope. */
18392 TEMPLATE_ID_EXPR,
18395 }
18396 else
18397 {
18398 /* If it's not a class-template or a template-template, it should be
18399 a function-template. */
18405 }
18407 /* If parsing tentatively, replace the sequence of tokens that makes
18408 up the template-id with a CPP_TEMPLATE_ID token. That way,
18409 should we re-parse the token stream, we will not have to repeat
18410 the effort required to do the parse, nor will we issue duplicate
18411 error messages about problems during instantiation of the
18412 template. */
18414 /* Don't do this if we had a parse error in a declarator; re-parsing
18415 might succeed if a name changes meaning (60361). */
18419 {
18420 /* Reset the contents of the START_OF_ID token. */
18424 /* Retrieve any deferred checks. Do not pop this access checks yet
18425 so the memory will not be reclaimed during token replacing below. */
18432 /* Purge all subsequent tokens. */
18435 /* ??? Can we actually assume that, if template_id ==
18436 error_mark_node, we will have issued a diagnostic to the
18437 user, as opposed to simply marking the tentative parse as
18438 failed? */
18441 }
18445 }
18447 /* Like cp_parser_template_id, called in non-type context. */
18449 static tree
18454 {
18459 /* We didn't check the arguments in cp_parser_template_id; do that now. */
18462 }
18464 /* Parse a template-name.
18466 template-name:
18467 identifier
18469 The standard should actually say:
18471 template-name:
18472 identifier
18473 operator-function-id
18475 A defect report has been filed about this issue.
18477 A conversion-function-id cannot be a template name because they cannot
18478 be part of a template-id. In fact, looking at this code:
18480 a.operator K<int>()
18482 the conversion-function-id is "operator K<int>", and K<int> is a type-id.
18483 It is impossible to call a templated conversion-function-id with an
18484 explicit argument list, since the only allowed template parameter is
18485 the type to which it is converting.
18487 If TEMPLATE_KEYWORD_P is true, then we have just seen the
18488 `template' keyword, in a construction like:
18490 T::template f<3>()
18492 In that case `f' is taken to be a template-name, even though there
18493 is no way of knowing for sure.
18495 Returns the TEMPLATE_DECL for the template, or an OVERLOAD if the
18496 name refers to a set of overloaded functions, at least one of which
18497 is a template, or an IDENTIFIER_NODE with the name of the template,
18498 if TEMPLATE_KEYWORD_P is true. If CHECK_DEPENDENCY_P is FALSE,
18499 names are looked up inside uninstantiated templates. */
18501 static tree
18508 {
18509 tree identifier;
18510 tree decl;
18513 /* If the next token is `operator', then we have either an
18514 operator-function-id or a conversion-function-id. */
18516 {
18517 /* We don't know whether we're looking at an
18518 operator-function-id or a conversion-function-id. */
18520 /* Try an operator-function-id. */
18522 /* If that didn't work, try a conversion-function-id. */
18524 {
18527 }
18528 }
18529 /* Look for the identifier. */
18530 else
18533 /* If we didn't find an identifier, we don't have a template-id. */
18537 /* If the name immediately followed the `template' keyword, then it
18538 is a template-name. However, if the next token is not `<', then
18539 we do not treat it as a template-name, since it is not being used
18540 as part of a template-id. This enables us to handle constructs
18541 like:
18543 template <typename T> struct S { S(); };
18544 template <typename T> S<T>::S();
18546 correctly. We would treat `S' as a template -- if it were `S<T>'
18547 -- but we do not if there is no `<'. */
18551 {
18552 /* In a declaration, in a dependent context, we pretend that the
18553 "template" keyword was present in order to improve error
18554 recovery. For example, given:
18556 template <typename T> void f(T::X<int>);
18558 we want to treat "X<int>" as a template-id. */
18560 && !template_keyword_p
18562 && check_dependency_p
18564 /* Do not do this for dtors (or ctors), since they never
18565 need the template keyword before their name. */
18567 {
18570 /* Explain what went wrong. */
18572 identifier);
18575 /* If parsing tentatively, find the location of the "<" token. */
18578 /* Parse the template arguments so that we can issue error
18579 messages about them. */
18582 /* Skip tokens until we find a good place from which to
18583 continue parsing. */
18588 /* If parsing tentatively, permanently remove the
18589 template argument list. That will prevent duplicate
18590 error messages from being issued about the missing
18591 "template" keyword. */
18598 }
18600 /* If the "template" keyword is present, then there is generally
18601 no point in doing name-lookup, so we just return IDENTIFIER.
18602 But, if the qualifying scope is non-dependent then we can
18603 (and must) do name-lookup normally. */
18605 {
18611 {
18612 /* We're optimizing away the call to cp_parser_lookup_name, but
18613 we still need to do this. */
18617 }
18618 }
18619 }
18621 /* cp_parser_lookup_name clears OBJECT_TYPE. */
18625 /* Look up the name. */
18627 tag_type,
18630 check_dependency_p,
18636 /* 13.3 [temp.names] A < is interpreted as the delimiter of a
18637 template-argument-list if it follows a name that is not a
18638 conversion-function-id and
18639 - that follows the keyword template or a ~ after a nested-name-specifier or
18640 in a class member access expression, or
18641 - for which name lookup finds the injected-class-name of a class template
18642 or finds any declaration of a template, or
18643 - that is an unqualified name for which name lookup either finds one or
18644 more functions or finds nothing, or
18645 - that is a terminal name in a using-declarator (9.9), in a declarator-id
18646 (9.3.4), or in a type-only context other than a nested-name-specifier
18647 (13.8). */
18649 /* Handle injected-class-name. */
18652 /* If DECL is a template, then the name was a template-name. */
18654 {
18657 {
18659 tree attr;
18662 else
18665 {
18668 }
18671 {
18674 }
18675 }
18676 }
18677 else
18678 {
18679 /* Look through an overload set for any templates. */
18687 /* "an unqualified name for which name lookup either finds one or more
18688 functions or finds nothing". */
18691 && !scope
18694 {
18695 /* The "more functions" case. Just use the OVERLOAD as normally.
18696 We don't use is_overloaded_fn here to avoid considering
18697 BASELINKs. */
18699 /* Name lookup found one function. */
18701 /* Name lookup found nothing. */
18704 }
18706 /* "that follows the keyword template"..."in a type-only context" */
18714 {
18715 /* The name does not name a template. */
18718 }
18721 /* cp_parser_template_id can only handle some TYPE_DECLs. */
18724 /* Repeat the lookup at instantiation time. */
18726 }
18729 }
18731 /* Parse a template-argument-list.
18733 template-argument-list:
18734 template-argument ... [opt]
18735 template-argument-list , template-argument ... [opt]
18737 Returns a TREE_VEC containing the arguments. */
18739 static tree
18741 {
18746 /* Don't create location wrapper nodes within a template-argument-list. */
18747 auto_suppress_location_wrappers sentinel;
18751 /* Even if the template-id appears in an integral
18752 constant-expression, the contents of the argument list do
18753 not. */
18759 /* Parse the arguments. */
18761 do
18762 {
18764 /* Consume the comma. */
18767 /* Parse the template-argument. */
18770 /* If the next token is an ellipsis, we're expanding a template
18771 argument pack. */
18773 {
18775 {
18779 }
18780 /* Consume the `...' token. */
18783 /* Make the argument into a TYPE_PACK_EXPANSION or
18784 EXPR_PACK_EXPANSION. */
18786 }
18789 }
18804 }
18806 /* Parse a template-argument.
18808 template-argument:
18809 assignment-expression
18810 type-id
18811 id-expression
18813 The representation is that of an assignment-expression, type-id, or
18814 id-expression -- except that the qualified id-expression is
18815 evaluated, so that the value returned is either a DECL or an
18816 OVERLOAD.
18818 Although the standard says "assignment-expression", it forbids
18819 throw-expressions or assignments in the template argument.
18820 Therefore, we use "conditional-expression" instead. */
18822 static tree
18824 {
18825 tree argument;
18831 cp_id_kind idk;
18833 /* There's really no way to know what we're looking at, so we just
18834 try each alternative in order.
18836 [temp.arg]
18838 In a template-argument, an ambiguity between a type-id and an
18839 expression is resolved to a type-id, regardless of the form of
18840 the corresponding template-parameter.
18842 Therefore, we try a type-id first. */
18845 /* If there was no error parsing the type-id but the next token is a
18846 '>>', our behavior depends on which dialect of C++ we're
18847 parsing. In C++98, we probably found a typo for '> >'. But there
18848 are type-id which are also valid expressions. For instance:
18850 struct X { int operator >> (int); };
18851 template <int V> struct Foo {};
18852 Foo<X () >> 5> r;
18854 Here 'X()' is a valid type-id of a function type, but the user just
18855 wanted to write the expression "X() >> 5". Thus, we remember that we
18856 found a valid type-id, but we still try to parse the argument as an
18857 expression to see what happens.
18859 In C++0x, the '>>' will be considered two separate '>'
18860 tokens. */
18864 /* Similarly for >= which
18865 cp_parser_next_token_ends_template_argument_p treats for
18866 diagnostics purposes as mistyped > =, but can be valid
18867 after a type-id. */
18869 {
18872 }
18873 else
18874 {
18875 /* If the next token isn't a `,' or a `>', then this argument wasn't
18876 really finished. This means that the argument is not a valid
18877 type-id. */
18880 /* If that worked, we're done. */
18883 }
18884 /* We're still not sure what the argument will be. */
18886 /* Try a template. */
18894 /* If the next token isn't a `,' or a `>', then this argument wasn't
18895 really finished. */
18899 {
18900 /* Figure out what is being referred to. If the id-expression
18901 was for a class template specialization, then we will have a
18902 TYPE_DECL at this point. There is no need to do name lookup
18903 at this point in that case. */
18906 none_type,
18915 }
18917 {
18923 }
18924 /* It must be a non-type argument. In C++17 any constant-expression is
18925 allowed. */
18929 /* Otherwise, the permitted cases are given in [temp.arg.nontype]:
18931 -- an integral constant-expression of integral or enumeration
18932 type; or
18934 -- the name of a non-type template-parameter; or
18936 -- the name of an object or function with external linkage...
18938 -- the address of an object or function with external linkage...
18940 -- a pointer to member... */
18941 /* Look for a non-type template parameter. */
18943 {
18955 }
18957 /* If the next token is "&", the argument must be the address of an
18958 object or function with external linkage. */
18961 {
18964 }
18965 /* See if we might have an id-expression. */
18972 {
18975 address_p,
18982 else
18983 {
18984 tree probe;
18987 {
18988 /* Strip the dereference temporarily. */
18991 }
18993 /* If we're in a template, we represent a qualified-id referring
18994 to a static data member as a SCOPE_REF even if the scope isn't
18995 dependent so that we can check access control later. */
19000 {
19001 /* A variable without external linkage might still be a
19002 valid constant-expression, so no error is issued here
19003 if the external-linkage check fails. */
19006 }
19008 /* All overloaded functions are allowed; if the external
19009 linkage test does not pass, an error will be issued
19010 later. */
19011 ;
19015 /* A pointer-to-member. */
19016 ;
19018 ;
19019 else
19023 {
19027 else
19030 }
19031 }
19032 }
19033 /* If the argument started with "&", there are no other valid
19034 alternatives at this point. */
19036 {
19039 }
19041 general_expr:
19042 /* If the argument wasn't successfully parsed as a type-id followed
19043 by '>>', the argument can only be a constant expression now.
19044 Otherwise, we try parsing the constant-expression tentatively,
19045 because the argument could really be a type-id. */
19051 else
19052 {
19053 /* In C++20, we can encounter a braced-init-list. */
19056 {
19059 }
19061 /* With C++17 generalized non-type template arguments we need to handle
19062 lvalue constant expressions, too. */
19065 }
19073 /* We did our best to parse the argument as a non type-id, but that
19074 was the only alternative that matched (albeit with a '>' after
19075 it). We can assume it's just a typo from the user, and a
19076 diagnostic will then be issued. */
19078 }
19080 /* Parse an explicit-instantiation.
19082 explicit-instantiation:
19083 template declaration
19085 Although the standard says `declaration', what it really means is:
19087 explicit-instantiation:
19088 template decl-specifier-seq [opt] declarator [opt] ;
19090 Things like `template int S<int>::i = 5, int S<double>::j;' are not
19091 supposed to be allowed. A defect report has been filed about this
19092 issue.
19094 GNU Extension:
19096 explicit-instantiation:
19097 storage-class-specifier template
19098 decl-specifier-seq [opt] declarator [opt] ;
19099 function-specifier template
19100 decl-specifier-seq [opt] declarator [opt] ; */
19102 static void
19104 {
19106 cp_decl_specifier_seq decl_specifiers;
19111 /* Look for an (optional) storage-class-specifier or
19112 function-specifier. */
19114 {
19115 extension_specifier
19118 extension_specifier
19121 }
19123 /* Look for the `template' keyword. */
19125 /* Let the front end know that we are processing an explicit
19126 instantiation. */
19128 /* [temp.explicit] says that we are supposed to ignore access
19129 control while processing explicit instantiation directives. */
19131 /* Parse a decl-specifier-seq. */
19133 CP_PARSER_FLAGS_OPTIONAL,
19137 cp_omp_declare_simd_data odsd;
19143 /* If there was exactly one decl-specifier, and it declared a class,
19144 and there's no declarator, then we have an explicit type
19145 instantiation. */
19147 {
19150 /* Turn access control back on for names used during
19151 template instantiation. */
19156 }
19157 else
19158 {
19160 tree decl;
19162 /* Parse the declarator. */
19163 declarator
19165 CP_PARSER_FLAGS_NONE,
19176 {
19179 "explicit instantiation shall not use"
19183 "explicit instantiation shall not use"
19187 "explicit instantiation shall not use"
19192 /* Turn access control back on for names used during
19193 template instantiation. */
19195 /* Do the explicit instantiation. */
19197 }
19198 else
19199 {
19201 /* Skip the body of the explicit instantiation. */
19203 }
19204 }
19205 /* We're done with the instantiation. */
19213 }
19215 /* Parse an explicit-specialization.
19217 explicit-specialization:
19218 template < > declaration
19220 Although the standard says `declaration', what it really means is:
19222 explicit-specialization:
19223 template <> decl-specifier [opt] init-declarator [opt] ;
19224 template <> function-definition
19225 template <> explicit-specialization
19226 template <> template-declaration */
19228 static void
19230 {
19233 /* Look for the `template' keyword. */
19235 /* Look for the `<'. */
19237 /* Look for the `>'. */
19239 /* We have processed another parameter list. */
19242 /* [temp]
19244 A template ... explicit specialization ... shall not have C
19245 linkage. */
19248 {
19252 /* Give it C++ linkage to avoid confusing other parts of the
19253 front end. */
19255 }
19257 /* Let the front end know that we are beginning a specialization. */
19259 {
19260 /* If the next keyword is `template', we need to figure out
19261 whether or not we're looking a template-declaration. */
19263 {
19268 else
19270 }
19271 else
19272 /* Parse the dependent declaration. */
19278 }
19280 /* We're done with the specialization. */
19283 /* For the erroneous case of a template with C linkage, we pushed an
19284 implicit C++ linkage scope; exit that scope now. */
19288 /* We're done with this parameter list. */
19290 }
19292 /* Preserve the attributes across a garbage collect (by making it a GC
19293 root), which can occur when parsing a member function. */
19297 /* Parse a type-specifier.
19299 type-specifier:
19300 simple-type-specifier
19301 class-specifier
19302 enum-specifier
19303 elaborated-type-specifier
19304 cv-qualifier
19306 GNU Extension:
19308 type-specifier:
19309 __complex__
19311 Returns a representation of the type-specifier. For a
19312 class-specifier, enum-specifier, or elaborated-type-specifier, a
19313 TREE_TYPE is returned; otherwise, a TYPE_DECL is returned.
19315 The parser flags FLAGS is used to control type-specifier parsing.
19317 If IS_DECLARATION is TRUE, then this type-specifier is appearing
19318 in a decl-specifier-seq.
19320 If DECLARES_CLASS_OR_ENUM is non-NULL, and the type-specifier is a
19321 class-specifier, enum-specifier, or elaborated-type-specifier, then
19322 *DECLARES_CLASS_OR_ENUM is set to a nonzero value. The value is 1
19323 if a type is declared; 2 if it is defined. Otherwise, it is set to
19324 zero.
19326 If IS_CV_QUALIFIER is non-NULL, and the type-specifier is a
19327 cv-qualifier, then IS_CV_QUALIFIER is set to TRUE. Otherwise, it
19328 is set to FALSE. */
19330 static tree
19332 cp_parser_flags flags,
19337 {
19343 /* Assume this type-specifier does not declare a new type. */
19346 /* And that it does not specify a cv-qualifier. */
19349 /* Peek at the next token. */
19352 /* If we're looking at a keyword, we can use that to guide the
19353 production we choose. */
19356 {
19361 /* Look for the enum-specifier. */
19363 /* If that worked, we're done. */
19365 {
19370 type_spec,
19371 token,
19374 }
19375 else
19378 /* Any of these indicate either a class-specifier, or an
19379 elaborated-type-specifier. */
19386 /* Parse tentatively so that we can back up if we don't find a
19387 class-specifier. */
19391 /* Look for the class-specifier. */
19396 /* If that worked, we're done. */
19398 {
19403 type_spec,
19404 token,
19407 }
19409 /* Fall through. */
19410 elaborated_type_specifier:
19411 /* We're declaring (not defining) a class or enum. */
19415 /* Fall through. */
19417 /* Look for an elaborated-type-specifier. */
19418 type_spec
19419 = (cp_parser_elaborated_type_specifier
19422 is_declaration));
19425 type_spec,
19426 token,
19449 /* The `__complex__' keyword is a GNU extension. */
19455 }
19457 /* Handle simple keywords. */
19459 {
19461 {
19464 }
19466 }
19468 /* If we do not already have a type-specifier, assume we are looking
19469 at a simple-type-specifier. */
19471 decl_specs,
19472 flags);
19474 /* If we didn't find a type-specifier, and a type-specifier was not
19475 optional in this context, issue an error message. */
19477 {
19480 }
19483 }
19485 /* Parse a simple-type-specifier.
19487 simple-type-specifier:
19488 :: [opt] nested-name-specifier [opt] type-name
19489 :: [opt] nested-name-specifier template template-id
19490 char
19491 wchar_t
19492 bool
19493 short
19494 int
19495 long
19496 signed
19497 unsigned
19498 float
19499 double
19500 void
19502 C++11 Extension:
19504 simple-type-specifier:
19505 auto
19506 decltype ( expression )
19507 char16_t
19508 char32_t
19509 __underlying_type ( type-id )
19511 C++17 extension:
19513 nested-name-specifier(opt) template-name
19515 GNU Extension:
19517 simple-type-specifier:
19518 __int128
19519 __typeof__ unary-expression
19520 __typeof__ ( type-id )
19521 __typeof__ ( type-id ) { initializer-list , [opt] }
19523 Concepts Extension:
19525 simple-type-specifier:
19526 constrained-type-specifier
19528 Returns the indicated TYPE_DECL. If DECL_SPECS is not NULL, it is
19529 appropriately updated. */
19531 static tree
19534 cp_parser_flags flags)
19535 {
19540 /* Peek at the next token. */
19543 /* If we're looking at a keyword, things are easy. */
19545 {
19583 {
19586 /* Check if the alternate "__intN__" form has been used instead of
19587 "__intN". */
19591 }
19620 {
19621 /* The 'auto' might be the placeholder return type for a function decl
19622 with trailing return type. */
19631 {
19633 {
19640 }
19643 {
19646 }
19649 }
19653 {
19656 }
19659 {
19662 }
19663 else
19667 {
19670 "use of %<auto%> in lambda parameter declaration "
19671 "only available with "
19673 }
19676 "use of %<auto%> in parameter declaration "
19677 "only available with "
19681 "use of %<auto%> in parameter declaration "
19683 }
19684 else
19689 /* Since DR 743, decltype can either be a simple-type-specifier by
19690 itself or begin a nested-name-specifier. Parsing it will replace
19691 it with a CPP_DECLTYPE, so just rewind and let the CPP_DECLTYPE
19692 handling below decide what to do. */
19698 /* Consume the `typeof' token. */
19700 /* Parse the operand to `typeof'. */
19702 /* If it is not already a TYPE, take its type. */
19708 token,
19717 token,
19727 token,
19732 }
19734 /* If token is an already-parsed decltype not followed by ::,
19735 it's a simple-type-specifier. */
19738 {
19741 {
19743 token,
19745 /* Remember that we are handling a decltype in order to
19746 implement the resolution of DR 1510 when the argument
19747 isn't instantiation dependent. */
19749 }
19752 }
19754 /* If the type-specifier was for a built-in type, we're done. */
19756 {
19757 /* Record the type. */
19764 type,
19765 token,
19770 /* Consume the token. */
19776 /* There is no valid C++ program where a non-template type is
19777 followed by a "<". That usually indicates that the user thought
19778 that the type was a template. */
19783 }
19785 /* The type-specifier must be a user-defined type. */
19787 {
19793 /* Don't gobble tokens or issue error messages if this is an
19794 optional type-specifier. */
19798 /* Remember current tentative parsing state -- if we know we need
19799 a type, we can give better diagnostics here. */
19804 /* Look for the optional `::' operator. */
19805 global_p
19809 /* Look for the nested-name specifier. */
19810 qualified_p
19817 /* If we have seen a nested-name-specifier, and the next token
19818 is `template', then we are using the template-id production. */
19821 {
19822 /* Look for the template-id. */
19826 none_type,
19828 /* If the template-id did not name a type, we are out of
19829 luck. */
19831 {
19832 /* ...unless we pretend we have seen 'typename'. */
19836 else
19837 {
19840 }
19841 }
19842 }
19843 /* DR 1812: A < following a qualified-id in a typename-specifier
19844 could safely be assumed to begin a template argument list, so
19845 the template keyword should be optional. */
19847 && qualified_p
19848 && typename_p
19850 {
19856 none_type,
19858 /* This is handled below, so back off. */
19869 }
19871 /* Otherwise, look for a type-name. */
19873 {
19881 }
19884 {
19885 /* Try for a type-constraint with template arguments. We check
19886 decl_specs here to avoid trying this for a functional cast. */
19893 none_type,
19896 {
19901 /* Perhaps it's a concept-check expression. */
19903 }
19904 else
19909 }
19912 {
19913 /* Try class template argument deduction or type-constraint without
19914 template arguments. */
19918 {
19919 location_t loc
19922 none_type,
19934 else
19935 {
19940 }
19941 }
19942 else
19944 }
19946 /* If it didn't work out, we don't have a TYPE. */
19951 /* Keep track of all name-lookups performed in class scopes. */
19953 && !global_p
19954 && !qualified_p
19961 token,
19963 }
19965 /* If we didn't get a type-name, issue an error message. */
19967 {
19970 }
19973 {
19974 /* See if TYPE is an Objective-C type, and if so, parse and
19975 accept any protocol references following it. Do this before
19976 the cp_parser_check_for_invalid_template_id() call, because
19977 Objective-C types can be followed by '<...>' which would
19978 enclose protocol names rather than template arguments, and so
19979 everything is fine. */
19982 {
19986 /* Clobber the "unqualified" type previously entered into
19987 DECL_SPECS with the new, improved protocol-qualified version. */
19992 }
19994 /* There is no valid C++ program where a non-template type is
19995 followed by a "<". That usually indicates that the user
19996 thought that the type was a template. */
19998 none_type,
20000 }
20003 }
20005 /* Parse the remainder of a placholder-type-specifier.
20007 placeholder-type-specifier:
20008 type-constraint_opt auto
20009 type-constraint_opt decltype(auto)
20011 The raw form of the constraint is parsed in cp_parser_simple_type_specifier
20012 and passed as TMPL. This function converts TMPL to an actual type-constraint,
20013 parses the placeholder type, and performs some contextual syntactic analysis.
20015 LOC provides the location of the template name.
20017 TENTATIVE is true if the type-specifier parsing is tentative; in that case,
20018 don't give an error if TMPL isn't a valid type-constraint, as the template-id
20019 might actually be a concept-check,
20021 Note that the Concepts TS allows the auto or decltype(auto) to be
20022 omitted in a constrained-type-specifier. */
20024 static tree
20027 {
20033 /* Get the arguments as written for subsequent analysis. */
20036 {
20039 }
20040 else
20041 /* A concept-name with no arguments can't be an expression. */
20046 /* Get the concept and prototype parameter for the constraint. */
20053 /* As per the standard, require auto or decltype(auto), except in some
20054 cases (template parameter lists, -fconcepts-ts enabled). */
20057 {
20061 {
20063 matching_parens parens;
20067 }
20068 }
20070 /* A type constraint constrains a contextually determined type or type
20071 parameter pack. However, the Concepts TS does allow concepts
20072 to introduce non-type and template template parameters. */
20074 {
20077 {
20079 {
20082 }
20084 }
20085 }
20087 /* In a template parameter list, a type-parameter can be introduced
20088 by type-constraints alone. */
20090 {
20091 /* In a default argument we may not be creating new parameters. */
20093 {
20094 /* If this assert turns out to be false, do error() instead. */
20097 }
20099 }
20101 /* Diagnose issues placeholder issues. */
20105 {
20107 /* Perhaps it's a concept-check expression (c++/91073). */
20114 /* Fall through. This is an error of omission. */
20115 }
20117 {
20118 /* A trailing return type only allows type-constraints. */
20121 }
20123 /* In a parameter-declaration-clause, a placeholder-type-specifier
20124 results in an invented template parameter. */
20126 {
20128 {
20134 }
20137 }
20139 /* Determine if the type should be deduced using template argument
20140 deduction or decltype deduction. Note that the latter is always
20141 used for type-constraints in trailing return types. */
20146 /* Otherwise, this is the type of a variable or return type. */
20149 else
20151 }
20153 /* Parse a type-name.
20155 type-name:
20156 class-name
20157 enum-name
20158 typedef-name
20159 simple-template-id [in c++0x]
20161 enum-name:
20162 identifier
20164 typedef-name:
20165 identifier
20167 Concepts:
20169 type-name:
20170 concept-name
20171 partial-concept-id
20173 concept-name:
20174 identifier
20176 Returns a TYPE_DECL for the type. */
20178 static tree
20180 {
20181 tree type_decl;
20183 /* We can't know yet whether it is a class-name or not. */
20185 /* Try a class-name. */
20187 typename_keyword_p,
20189 none_type,
20193 /* If it's not a class-name, keep looking. */
20195 {
20197 /* It must be a typedef-name or an enum-name. */
20201 /* It is either a simple-template-id representing an
20202 instantiation of an alias template... */
20206 none_type,
20208 /* Note that this must be an instantiation of an alias template
20209 because [temp.names]/6 says:
20211 A template-id that names an alias template specialization
20212 is a type-name.
20214 Whereas [temp.names]/7 says:
20216 A simple-template-id that names a class template
20217 specialization is a class-name.
20219 With concepts, this could also be a partial-concept-id that
20220 declares a non-type template parameter. */
20225 else
20229 /* ... Or a typedef-name or an enum-name. */
20231 }
20234 }
20236 /* Parse a non-class type-name, that is, either an enum-name, a typedef-name,
20237 or a concept-name.
20239 enum-name:
20240 identifier
20242 typedef-name:
20243 identifier
20245 concept-name:
20246 identifier
20248 Returns a TYPE_DECL for the type. */
20250 static tree
20252 {
20253 tree type_decl;
20254 tree identifier;
20261 /* Look up the type-name. */
20268 {
20269 /* See if this is an Objective-C type. */
20274 }
20276 /* Issue an error if we did not find a type-name. */
20278 /* In Objective-C, we have the complication that class names are
20279 normally type names and start declarations (eg, the
20280 "NSObject" in "NSObject *object;"), but can be used in an
20281 Objective-C 2.0 dot-syntax (as in "NSObject.version") which
20282 is an expression. So, a classname followed by a dot is not a
20283 valid type-name. */
20286 {
20291 }
20292 /* Remember that the name was used in the definition of the
20293 current class so that we can check later to see if the
20294 meaning would have been different after the class was
20295 entirely defined. */
20301 }
20303 /* Parse an elaborated-type-specifier. Note that the grammar given
20304 here incorporates the resolution to DR68.
20306 elaborated-type-specifier:
20307 class-key :: [opt] nested-name-specifier [opt] identifier
20308 class-key :: [opt] nested-name-specifier [opt] template [opt] template-id
20309 enum-key :: [opt] nested-name-specifier [opt] identifier
20310 typename :: [opt] nested-name-specifier identifier
20311 typename :: [opt] nested-name-specifier template [opt]
20312 template-id
20314 GNU extension:
20316 elaborated-type-specifier:
20317 class-key attributes :: [opt] nested-name-specifier [opt] identifier
20318 class-key attributes :: [opt] nested-name-specifier [opt]
20319 template [opt] template-id
20320 enum attributes :: [opt] nested-name-specifier [opt] identifier
20322 If IS_FRIEND is TRUE, then this elaborated-type-specifier is being
20323 declared `friend'. If IS_DECLARATION is TRUE, then this
20324 elaborated-type-specifier appears in a decl-specifiers-seq, i.e.,
20325 something is being declared.
20327 Returns the TYPE specified. */
20329 static tree
20333 {
20335 tree identifier;
20338 tree globalscope;
20341 /* For class and enum types the location of the class-key or enum-key. */
20343 /* For a scoped enum, the 'class' or 'struct' keyword id. */
20346 /* See if we're looking at the `enum' keyword. */
20348 {
20349 /* Consume the `enum' token. */
20351 /* Remember that it's an enumeration type. */
20353 /* Issue a warning if the `struct' or `class' key (for C++0x scoped
20354 enums) is used here. */
20358 {
20366 /* Consume the `struct' or `class' and parse it anyway. */
20368 /* Create a combined location for the whole scoped-enum-key. */
20370 }
20371 else
20374 /* Parse the attributes. */
20376 }
20377 /* Or, it might be `typename'. */
20379 RID_TYPENAME))
20380 {
20381 /* Consume the `typename' token. */
20383 /* Remember that it's a `typename' type. */
20385 }
20386 /* Otherwise it must be a class-key. */
20387 else
20388 {
20393 /* Parse the attributes. */
20395 }
20397 /* Look for the `::' operator. */
20400 /* Look for the nested-name-specifier. */
20401 tree nested_name_specifier;
20403 {
20404 nested_name_specifier
20409 is_declaration);
20412 }
20413 else
20414 /* Even though `typename' is not present, the proposed resolution
20415 to Core Issue 180 says that in `class A<T>::B', `B' should be
20416 considered a type-name, even if `A<T>' is dependent. */
20417 nested_name_specifier
20422 is_declaration);
20423 /* For everything but enumeration types, consider a template-id.
20424 For an enumeration type, consider only a plain identifier. */
20426 {
20428 tree decl;
20430 /* Allow the `template' keyword. */
20432 /* If we didn't see `template', we don't know if there's a
20433 template-id or not. */
20436 /* The `template' keyword must follow a nested-name-specifier. */
20438 {
20442 }
20444 /* Parse the template-id. */
20448 tag_type,
20449 is_declaration);
20450 /* If we didn't find a template-id, look for an ordinary
20451 identifier. */
20453 ;
20454 /* We can get here when cp_parser_template_id, called by
20455 cp_parser_class_name with tag_type == none_type, succeeds
20456 and caches a BASELINK. Then, when called again here,
20457 instead of failing and returning an error_mark_node
20458 returns it (see template/typename17.C in C++11).
20459 ??? Could we diagnose this earlier? */
20461 {
20464 }
20465 /* If DECL is a TEMPLATE_ID_EXPR, and the `typename' keyword is
20466 in effect, then we must assume that, upon instantiation, the
20467 template will correspond to a class. */
20471 typename_type,
20473 /* If the `typename' keyword is in effect and DECL is not a type
20474 decl, then type is non existent. */
20476 ;
20478 {
20482 /* If the next token is a semicolon, this must be a specialization,
20483 instantiation, or friend declaration. Check the scope while we
20484 still know whether or not we had a nested-name-specifier. */
20489 }
20492 }
20495 {
20500 {
20503 }
20505 /* For a `typename', we needn't call xref_tag. */
20511 /* Template parameter lists apply only if we are not within a
20512 function parameter list. */
20513 bool template_parm_lists_apply
20522 /* Look up a qualified name in the usual way. */
20524 {
20525 tree decl;
20526 tree ambiguous_decls;
20529 tag_type,
20536 /* If the lookup was ambiguous, an error will already have been
20537 issued. */
20541 /* If we are parsing friend declaration, DECL may be a
20542 TEMPLATE_DECL tree node here. However, we need to check
20543 whether this TEMPLATE_DECL results in valid code. Consider
20544 the following example:
20546 namespace N {
20547 template <class T> class C {};
20548 }
20549 class X {
20550 template <class T> friend class N::C; // #1, valid code
20551 };
20552 template <class T> class Y {
20553 friend class N::C; // #2, invalid code
20554 };
20556 For both case #1 and #2, we arrive at a TEMPLATE_DECL after
20557 name lookup of `N::C'. We see that friend declaration must
20558 be template for the code to be valid. Note that
20559 processing_template_decl does not work here since it is
20560 always 1 for the above two cases. */
20562 decl = (cp_parser_maybe_treat_template_as_class
20567 {
20569 identifier,
20572 }
20575 {
20579 allow_template);
20583 }
20585 /* Forward declarations of nested types, such as
20587 class C1::C2;
20588 class C1::C2::C3;
20590 are invalid unless all components preceding the final '::'
20591 are complete. If all enclosing types are complete, these
20592 declarations become merely pointless.
20594 Invalid forward declarations of nested types are errors
20595 caught elsewhere in parsing. Those that are pointless arrive
20596 here. */
20604 }
20605 else
20606 {
20607 /* An elaborated-type-specifier sometimes introduces a new type and
20608 sometimes names an existing type. Normally, the rule is that it
20609 introduces a new type only if there is not an existing type of
20610 the same name already in scope. For example, given:
20612 struct S {};
20613 void f() { struct S s; }
20615 the `struct S' in the body of `f' is the same `struct S' as in
20616 the global scope; the existing definition is used. However, if
20617 there were no global declaration, this would introduce a new
20618 local class named `S'.
20620 An exception to this rule applies to the following code:
20622 namespace N { struct S; }
20624 Here, the elaborated-type-specifier names a new type
20625 unconditionally; even if there is already an `S' in the
20626 containing scope this declaration names a new type.
20627 This exception only applies if the elaborated-type-specifier
20628 forms the complete declaration:
20630 [class.name]
20632 A declaration consisting solely of `class-key identifier ;' is
20633 either a redeclaration of the name in the current scope or a
20634 forward declaration of the identifier as a class name. It
20635 introduces the name into the current scope.
20637 We are in this situation precisely when the next token is a `;'.
20639 An exception to the exception is that a `friend' declaration does
20640 *not* name a new type; i.e., given:
20642 struct S { friend struct T; };
20644 `T' is not a new type in the scope of `S'.
20646 Also, `new struct S' or `sizeof (struct S)' never results in the
20647 definition of a new type; a new type can only be declared in a
20648 declaration context. */
20650 TAG_how how;
20653 /* Friends have special name lookup rules. */
20657 CPP_SEMICOLON))
20658 /* This is a `class-key identifier ;' */
20660 else
20664 (template_parm_lists_apply
20667 /* An unqualified name was used to reference this type, so
20668 there were no qualifying templates. */
20678 }
20679 }
20684 /* Allow attributes on forward declarations of classes. */
20686 {
20697 {
20701 }
20704 else
20706 "attributes ignored on elaborated-type-specifier that is "
20708 }
20712 else
20713 {
20714 /* Diagnose class/struct/union mismatches. IS_DECLARATION is false
20715 for alias definition. */
20719 decl_class);
20721 /* Indicate whether this class was declared as a `class' or as a
20722 `struct'. */
20725 }
20727 /* A "<" cannot follow an elaborated type specifier. If that
20728 happens, the user was probably trying to form a template-id. */
20733 }
20735 /* Parse an enum-specifier.
20737 enum-specifier:
20738 enum-head { enumerator-list [opt] }
20739 enum-head { enumerator-list , } [C++0x]
20741 enum-head:
20742 enum-key identifier [opt] enum-base [opt]
20743 enum-key nested-name-specifier identifier enum-base [opt]
20745 enum-key:
20746 enum
20747 enum class [C++0x]
20748 enum struct [C++0x]
20750 enum-base: [C++0x]
20751 : type-specifier-seq
20753 opaque-enum-specifier:
20754 enum-key identifier enum-base [opt] ;
20756 GNU Extensions:
20757 enum-key attributes[opt] identifier [opt] enum-base [opt]
20758 { enumerator-list [opt] }attributes[opt]
20759 enum-key attributes[opt] identifier [opt] enum-base [opt]
20760 { enumerator-list, }attributes[opt] [C++0x]
20762 Returns an ENUM_TYPE representing the enumeration, or NULL_TREE
20763 if the token stream isn't an enum-specifier after all. */
20765 static tree
20767 {
20768 tree identifier;
20770 tree prev_scope;
20772 tree attributes;
20783 /* Parse tentatively so that we can back up if we don't find a
20784 enum-specifier. */
20787 /* Caller guarantees that the current token is 'enum', an identifier
20788 possibly follows, and the token after that is an opening brace.
20789 If we don't have an identifier, fabricate an anonymous name for
20790 the enumeration being defined. */
20793 /* Parse the "class" or "struct", which indicates a scoped
20794 enumeration type in C++0x. */
20797 {
20801 /* Consume the `struct' or `class' token. */
20805 }
20809 /* Clear the qualification. */
20814 /* Figure out in what scope the declaration is being placed. */
20820 nested_name_specifier
20828 {
20829 tree name;
20833 enum_type,
20838 input_location);
20840 {
20843 {
20844 /* Are template enums allowed in ISO? */
20848 /* ignore a typename reference, for it will be solved by name
20849 in start_enum. */
20851 }
20852 }
20855 else
20856 {
20861 }
20862 }
20863 else
20864 {
20867 else
20868 {
20874 }
20875 }
20878 /* Check for the `:' that denotes a specified underlying type in C++0x.
20879 Note that a ':' could also indicate a bitfield width, however. */
20881 {
20882 cp_decl_specifier_seq type_specifiers;
20884 /* Consume the `:'. */
20887 auto tdf
20891 /* Parse the type-specifier-seq. */
20897 /* At this point this is surely not elaborated type specifier. */
20906 /* If that didn't work, stop. */
20908 {
20914 }
20915 }
20917 /* Look for the `{' but don't consume it yet. */
20919 {
20921 {
20927 }
20928 /* An opaque-enum-specifier must have a ';' here. */
20931 {
20937 }
20938 }
20944 {
20946 {
20950 }
20953 }
20955 /* Issue an error message if type-definitions are forbidden here. */
20958 else
20959 /* Create the new type. We do this before consuming the opening
20960 brace so the enum will be recorded as being on the line of its
20961 tag (or the 'enum' keyword, if there is no tag). */
20965 /* If the next token is not '{' it is an opaque-enum-specifier or an
20966 elaborated-type-specifier. */
20968 {
20972 {
20973 /* The following catches invalid code such as:
20974 enum class S<int>::E { A, B, C }; */
20982 {
20986 nested_name_specifier);
20988 }
20991 {
20993 "%qT for enum declaration does not name a class "
20996 }
20997 /* If that scope does not contain the scope in which the
20998 class was originally declared, the program is invalid. */
21000 nested_name_specifier))
21001 {
21004 "declaration of %qD in namespace %qD which does not "
21007 else
21009 "declaration of %qD in %qD which does not "
21013 }
21014 /* If that scope is the scope where the declaration is being placed
21015 the program is invalid. */
21019 {
21023 }
21024 }
21029 /* Consume the opening brace. */
21030 matching_braces braces;
21037 {
21041 }
21042 else
21043 {
21049 }
21053 /* If the next token is not '}', then there are some enumerators. */
21055 {
21057 /* Don't warn for enum {} a; here. */
21061 }
21062 else
21063 {
21064 /* We've seen a '{' so we know we're in an enum-specifier.
21065 Commit to any tentative parse to get syntax errors. */
21068 }
21070 /* Consume the final '}'. */
21076 }
21077 else
21078 {
21079 /* If a ';' follows, then it is an opaque-enum-specifier
21080 and additional restrictions apply. */
21082 {
21089 }
21090 }
21092 /* Look for trailing attributes to apply to this enumeration, and
21093 apply them if appropriate. */
21095 {
21098 trailing_attr,
21100 }
21102 /* Finish up the enumeration. */
21104 {
21109 }
21112 {
21114 {
21117 }
21120 }
21122 }
21124 /* Parse an enumerator-list. The enumerators all have the indicated
21125 TYPE.
21127 enumerator-list:
21128 enumerator-definition
21129 enumerator-list , enumerator-definition */
21131 static void
21133 {
21135 {
21136 /* Parse an enumerator-definition. */
21139 /* If the next token is not a ',', we've reached the end of
21140 the list. */
21143 /* Otherwise, consume the `,' and keep going. */
21145 /* If the next token is a `}', there is a trailing comma. */
21147 {
21152 }
21153 }
21154 }
21156 /* Parse an enumerator-definition. The enumerator has the indicated
21157 TYPE.
21159 enumerator-definition:
21160 enumerator
21161 enumerator = constant-expression
21163 enumerator:
21164 identifier
21166 GNU Extensions:
21168 enumerator-definition:
21169 enumerator attributes [opt]
21170 enumerator attributes [opt] = constant-expression */
21172 static void
21174 {
21175 tree identifier;
21176 tree value;
21177 location_t loc;
21179 /* Save the input location because we are interested in the location
21180 of the identifier and not the location of the explicit value. */
21183 /* Look for the identifier. */
21188 /* Parse any specified attributes. */
21191 /* If the next token is an '=', then there is an explicit value. */
21193 {
21194 /* Consume the `=' token. */
21196 /* Parse the value. */
21198 }
21199 else
21202 /* If we are processing a template, make sure the initializer of the
21203 enumerator doesn't contain any bare template parameter pack. */
21205 {
21206 /* In a lambda it should work, but doesn't currently. */
21208 {
21211 }
21212 }
21216 /* Create the enumerator. */
21218 }
21220 /* Parse a namespace-name.
21222 namespace-name:
21223 original-namespace-name
21224 namespace-alias
21226 Returns the NAMESPACE_DECL for the namespace. */
21228 static tree
21230 {
21231 tree identifier;
21232 tree namespace_decl;
21236 /* Get the name of the namespace. */
21241 /* Look up the identifier in the currently active scope. Look only
21242 for namespaces, due to:
21244 [basic.lookup.udir]
21246 When looking up a namespace-name in a using-directive or alias
21247 definition, only namespace names are considered.
21249 And:
21251 [basic.lookup.qual]
21253 During the lookup of a name preceding the :: scope resolution
21254 operator, object, function, and enumerator names are ignored.
21256 (Note that cp_parser_qualifying_entity only calls this
21257 function if the token after the name is the scope resolution
21258 operator.) */
21260 none_type,
21266 /* If it's not a namespace, issue an error. */
21269 {
21271 {
21272 auto_diagnostic_group d;
21273 name_hint hint;
21277 identifier,
21280 {
21286 }
21287 else
21289 identifier);
21290 }
21291 else
21294 }
21297 }
21299 /* Parse a namespace-definition.
21301 namespace-definition:
21302 named-namespace-definition
21303 unnamed-namespace-definition
21305 named-namespace-definition:
21306 original-namespace-definition
21307 extension-namespace-definition
21309 original-namespace-definition:
21310 namespace identifier { namespace-body }
21312 extension-namespace-definition:
21313 namespace original-namespace-name { namespace-body }
21315 unnamed-namespace-definition:
21316 namespace { namespace-body } */
21318 static void
21320 {
21321 tree identifier;
21331 {
21334 }
21336 /* Look for the `namespace' keyword. */
21337 cp_token* token
21340 /* Parse any specified attributes before the identifier. */
21344 {
21348 RID_INLINE);
21350 {
21354 "definitions only available with %<-std=c++20%> or "
21357 }
21360 {
21365 "standard attributes on namespaces must precede "
21368 /* Parse any attributes specified after the identifier. */
21370 }
21373 {
21374 /* Don't forget that the innermost namespace might have been
21375 marked as inline. Use |= because we cannot overwrite
21376 IS_INLINE in case the outermost namespace is inline, but
21377 there are no nested inlines. */
21380 }
21384 "nested namespace definitions only available with "
21387 /* Nested namespace names can create new namespaces (unlike
21388 other qualified-ids). */
21393 else
21396 }
21408 /* Start the namespace. */
21415 /* Look for the `{' to validate starting the namespace. */
21416 matching_braces braces;
21418 {
21419 /* Parse the body of the namespace. */
21422 /* Look for the final `}'. */
21424 }
21429 /* Pop the nested namespace definitions. */
21432 }
21434 /* Parse a namespace-body.
21436 namespace-body:
21437 declaration-seq [opt] */
21439 static void
21441 {
21443 }
21445 /* Parse a namespace-alias-definition.
21447 namespace-alias-definition:
21448 namespace identifier = qualified-namespace-specifier ; */
21450 static void
21452 {
21453 tree identifier;
21454 tree namespace_specifier;
21458 /* Look for the `namespace' keyword. */
21460 /* Look for the identifier. */
21464 /* Look for the `=' token. */
21467 {
21469 /* Skip the definition. */
21474 }
21476 /* Look for the qualified-namespace-specifier. */
21477 namespace_specifier
21480 /* Look for the `;' token. */
21483 /* Register the alias in the symbol table. */
21485 }
21487 /* Parse a qualified-namespace-specifier.
21489 qualified-namespace-specifier:
21490 :: [opt] nested-name-specifier [opt] namespace-name
21492 Returns a NAMESPACE_DECL corresponding to the specified
21493 namespace. */
21495 static tree
21497 {
21498 /* Look for the optional `::'. */
21502 /* Look for the optional nested-name-specifier. */
21510 }
21512 /* Subroutine of cp_parser_using_declaration. */
21514 static tree
21516 {
21519 {
21520 /* Create the USING_DECL. */
21529 /* Add it to the list of members in this class. */
21531 }
21532 else
21535 }
21537 /* Parse a using-declaration, or, if ACCESS_DECLARATION_P is true, an
21538 access declaration.
21540 using-declaration:
21541 using typename [opt] :: [opt] nested-name-specifier unqualified-id ;
21542 using :: unqualified-id ;
21544 access-declaration:
21545 qualified-id ;
21547 */
21549 static bool
21552 {
21556 tree identifier;
21557 tree qscope;
21562 {
21565 }
21566 else
21567 {
21568 /* Look for the `using' keyword. */
21571 again:
21572 /* Peek at the next token. */
21574 /* See if it's `typename'. */
21576 {
21577 /* Remember that we've seen it. */
21579 /* Consume the `typename' token. */
21581 }
21582 }
21584 /* Look for the optional global scope qualification. */
21585 global_scope_p
21590 /* If we saw `typename', or didn't see `::', then there must be a
21591 nested-name-specifier present. */
21593 {
21599 {
21602 }
21603 }
21604 /* Otherwise, we could be in either of the two productions. In that
21605 case, treat the nested-name-specifier as optional. */
21606 else
21618 /* Something has already gone wrong; there's no need to parse
21619 further. Since an error has occurred, the return value of
21620 cp_parser_parse_definitely will be false, as required. */
21624 /* Parse the unqualified-id. */
21632 {
21637 }
21639 {
21643 "pack expansion in using-declaration only available "
21646 }
21648 /* The function we call to handle a using-declaration is different
21649 depending on what scope we are in. */
21651 ;
21654 /* [namespace.udecl]
21656 A using declaration shall not name a template-id. */
21659 else
21660 {
21664 {
21667 }
21668 }
21672 {
21676 "comma-separated list in using-declaration only available "
21679 }
21681 /* Look for the final `;'. */
21686 "access declarations are deprecated "
21687 "in favour of using-declarations; "
21691 }
21693 /* C++20 using enum declaration.
21695 using-enum-declaration :
21696 using elaborated-enum-specifier ; */
21698 static void
21700 {
21703 /* Using cp_parser_elaborated_type_specifier rejects typedef-names, which
21704 breaks one of the motivating examples in using-enum-5.C.
21705 cp_parser_simple_type_specifier seems to be closer to what we actually
21706 want, though that hasn't been properly specified yet. */
21708 /* Consume 'enum'. */
21714 tree type = (cp_parser_simple_type_specifier
21721 {
21724 }
21728 /* The elaborated-enum-specifier shall not name a dependent type and the type
21729 shall have a reachable enum-specifier. */
21743 {
21745 auto_diagnostic_group g;
21749 ;
21752 else
21754 }
21756 /* A using-enum-declaration introduces the enumerator names of the named
21757 enumeration as if by a using-declaration for each enumerator. */
21761 }
21763 /* Parse an alias-declaration.
21765 alias-declaration:
21766 using identifier attribute-specifier-seq [opt] = type-id */
21768 static tree
21770 {
21774 cp_decl_specifier_seq decl_specs;
21778 /* Look for the `using' keyword. */
21779 cp_token *using_token
21801 /* Now we are going to parse the type-id of the declaration. */
21803 /*
21804 [dcl.type]/3 says:
21806 "A type-specifier-seq shall not define a class or enumeration
21807 unless it appears in the type-id of an alias-declaration (7.1.3) that
21808 is not the declaration of a template-declaration."
21810 In other words, if we currently are in an alias template, the
21811 type-id should not define a type.
21813 So let's set parser->type_definition_forbidden_message in that
21814 case; cp_parser_check_type_definition (called by
21815 cp_parser_class_specifier) will then emit an error if a type is
21816 defined in the type-id. */
21818 {
21822 }
21827 /* Restore the error message if need be. */
21833 {
21836 }
21838 /* A typedef-name can also be introduced by an alias-declaration. The
21839 identifier following the using keyword becomes a typedef-name. It has
21840 the same semantics as if it were introduced by the typedef
21841 specifier. In particular, it does not define a new type and it shall
21842 not appear in the type-id. */
21847 {
21850 ds_attribute,
21851 attrs_token);
21852 }
21854 ds_typedef,
21855 using_token);
21857 ds_alias,
21858 using_token);
21865 id_location,
21875 else
21886 /* If decl is a template, return its TEMPLATE_DECL so that it gets
21887 added into the symbol table; otherwise, return the TYPE_DECL. */
21891 {
21895 }
21898 }
21900 /* Parse a using-directive.
21902 using-directive:
21903 attribute-specifier-seq [opt] using namespace :: [opt]
21904 nested-name-specifier [opt] namespace-name ; */
21906 static void
21908 {
21909 tree namespace_decl;
21912 {
21913 /* Error during attribute parsing that resulted in skipping
21914 to next semicolon. */
21917 }
21919 /* Look for the `using' keyword. */
21921 /* And the `namespace' keyword. */
21923 /* Look for the optional `::' operator. */
21925 /* And the optional nested-name-specifier. */
21931 /* Get the namespace being used. */
21934 /* And any specified GNU attributes. */
21938 /* Update the symbol table. */
21941 /* Look for the final `;'. */
21943 }
21945 /* Parse an asm-definition.
21947 asm-qualifier:
21948 volatile
21949 inline
21950 goto
21952 asm-qualifier-list:
21953 asm-qualifier
21954 asm-qualifier-list asm-qualifier
21956 asm-definition:
21957 asm ( string-literal ) ;
21959 GNU Extension:
21961 asm-definition:
21962 asm asm-qualifier-list [opt] ( string-literal ) ;
21963 asm asm-qualifier-list [opt] ( string-literal : asm-operand-list [opt] ) ;
21964 asm asm-qualifier-list [opt] ( string-literal : asm-operand-list [opt]
21965 : asm-operand-list [opt] ) ;
21966 asm asm-qualifier-list [opt] ( string-literal : asm-operand-list [opt]
21967 : asm-operand-list [opt]
21968 : asm-clobber-list [opt] ) ;
21969 asm asm-qualifier-list [opt] ( string-literal : : asm-operand-list [opt]
21970 : asm-clobber-list [opt]
21971 : asm-goto-list ) ;
21973 The form with asm-goto-list is valid if and only if the asm-qualifier-list
21974 contains goto, and is the only allowed form in that case. No duplicates are
21975 allowed in an asm-qualifier-list. */
21977 static void
21979 {
21980 tree string;
21985 tree asm_stmt;
21992 /* Look for the `asm' keyword. */
21995 /* In C++20, unevaluated inline assembly is permitted in constexpr
21996 functions. */
22001 "function only available with %<-std=c++20%> or "
22004 /* Handle the asm-qualifier-list. */
22012 {
22016 {
22019 {
22023 }
22024 else
22025 {
22030 }
22036 {
22040 }
22041 else
22050 {
22054 }
22055 else
22070 }
22072 }
22079 {
22082 }
22084 /* Look for the opening `('. */
22087 /* Look for the string. */
22090 {
22094 }
22096 /* If we're allowing GNU extensions, check for the extended assembly
22097 syntax. Unfortunately, the `:' tokens need not be separated by
22098 a space in C, and so, for compatibility, we tolerate that here
22099 too. Doing that means that we have to treat the `::' operator as
22100 two `:' tokens. */
22105 {
22110 /* The extended syntax was used. */
22113 /* Look for outputs. */
22115 {
22116 /* Consume the `:'. */
22118 /* Parse the output-operands. */
22120 CPP_COLON)
22122 CPP_SCOPE)
22124 CPP_CLOSE_PAREN))
22125 {
22129 }
22130 }
22131 /* If the next token is `::', there are no outputs, and the
22132 next token is the beginning of the inputs. */
22134 /* The inputs are coming next. */
22137 /* Look for inputs. */
22140 {
22141 /* Consume the `:' or `::'. */
22143 /* Parse the output-operands. */
22145 CPP_COLON)
22147 CPP_SCOPE)
22149 CPP_CLOSE_PAREN))
22150 {
22154 }
22155 }
22157 /* The clobbers are coming next. */
22160 /* Look for clobbers. */
22163 {
22165 /* Consume the `:' or `::'. */
22167 /* Parse the clobbers. */
22169 CPP_COLON)
22171 CPP_CLOSE_PAREN))
22173 }
22175 /* The labels are coming next. */
22178 /* Look for labels. */
22181 {
22183 /* Consume the `:' or `::'. */
22185 /* Parse the labels. */
22187 }
22191 }
22195 /* Look for the closing `)'. */
22203 {
22204 /* Create the ASM_EXPR. */
22206 {
22209 /* If the extended syntax was not used, mark the ASM_EXPR. */
22211 {
22217 }
22218 }
22219 else
22221 }
22222 }
22224 /* Given the type TYPE of a declaration with declarator DECLARATOR, return the
22225 type that comes from the decl-specifier-seq. */
22227 static tree
22229 {
22232 {
22245 }
22248 }
22250 /* Warn about the most vexing parse syntactic ambiguity, i.e., warn when
22251 a construct looks like a variable definition but is actually a function
22252 declaration. DECL_SPECIFIERS is the decl-specifier-seq and DECLARATOR
22253 is the declarator for this function declaration. */
22255 static void
22258 {
22259 /* Only warn if we are declaring a function at block scope. */
22263 /* And only if there is no storage class specified. */
22275 /* Don't warn when the whole declarator (not just the declarator-id!)
22276 was parenthesized. That is, don't warn for int(n()) but do warn
22277 for int(f)(). */
22281 tree type;
22283 {
22288 /* If the return type is void there is no ambiguity. */
22291 }
22293 /* Code like long f(); will have null ->type. If we have any
22294 type-specifiers, pretend we've seen int. */
22296 else
22299 auto_diagnostic_group d;
22304 /* The T t() case. */
22306 {
22308 "empty parentheses were disambiguated as a function "
22310 {
22311 /* () means value-initialization (C++03 and up); {} (C++11 and up)
22312 means value-initialization or aggregate-initialization, nothing
22313 means default-initialization. We can only suggest removing the
22314 parentheses/adding {} if T has a default constructor. */
22316 {
22322 {
22326 else
22329 }
22330 }
22331 }
22333 }
22335 /* If we had (...) or the parameter-list wasn't parenthesized,
22336 we're done. */
22340 /* The T t(X()) case. */
22342 {
22344 "parentheses were disambiguated as a function "
22346 {
22348 /* {}-initialization means that we can use an initializer-list
22349 constructor if no default constructor is available, so don't
22350 suggest using {} for classes that have an initializer_list
22351 constructor. */
22353 {
22358 }
22359 else
22360 {
22364 }
22365 }
22366 }
22367 /* The T t(X(), X()) case. */
22369 "parentheses were disambiguated as a function "
22371 {
22374 {
22379 }
22380 }
22381 }
22383 /* If DECLARATOR with DECL_SPECS is a function declarator that has
22384 the form of a deduction guide, tag it as such. CTOR_DTOR_OR_CONV_P
22385 has the same meaning as in cp_parser_declarator. */
22387 static void
22392 {
22398 {
22406 {
22410 }
22411 }
22412 }
22414 /* Declarators [gram.dcl.decl] */
22416 /* Parse an init-declarator.
22418 init-declarator:
22419 declarator initializer [opt]
22421 GNU Extension:
22423 init-declarator:
22424 declarator asm-specification [opt] attributes [opt] initializer [opt]
22426 function-definition:
22427 decl-specifier-seq [opt] declarator ctor-initializer [opt]
22428 function-body
22429 decl-specifier-seq [opt] declarator function-try-block
22431 GNU Extension:
22433 function-definition:
22434 __extension__ function-definition
22436 TM Extension:
22438 function-definition:
22439 decl-specifier-seq [opt] declarator function-transaction-block
22441 The parser flags FLAGS is used to control type-specifier parsing.
22443 The DECL_SPECIFIERS apply to this declarator. Returns a
22444 representation of the entity declared. If MEMBER_P is TRUE, then
22445 this declarator appears in a class scope. The new DECL created by
22446 this declarator is returned.
22448 The CHECKS are access checks that should be performed once we know
22449 what entity is being declared (and, therefore, what classes have
22450 befriended it).
22452 If FUNCTION_DEFINITION_ALLOWED_P then we handle the declarator and
22453 for a function-definition here as well. If the declarator is a
22454 declarator for a function-definition, *FUNCTION_DEFINITION_P will
22455 be TRUE upon return. By that point, the function-definition will
22456 have been completely parsed.
22458 FUNCTION_DEFINITION_P may be NULL if FUNCTION_DEFINITION_ALLOWED_P
22459 is FALSE.
22461 If MAYBE_RANGE_FOR_DECL is not NULL, the pointed tree will be set to the
22462 parsed declaration if it is an uninitialized single declarator not followed
22463 by a `;', or to error_mark_node otherwise. Either way, the trailing `;',
22464 if present, will not be consumed. If returned, this declarator will be
22465 created with SD_INITIALIZED but will not call cp_finish_decl.
22467 If INIT_LOC is not NULL, and *INIT_LOC is equal to UNKNOWN_LOCATION,
22468 and there is an initializer, the pointed location_t is set to the
22469 location of the '=' or `(', or '{' in C++11 token introducing the
22470 initializer. */
22472 static tree
22474 cp_parser_flags flags,
22484 {
22488 tree prefix_attributes;
22490 tree asm_specification;
22491 tree initializer;
22493 tree scope;
22495 /* Only valid if IS_INITIALIZED is true. In that case, CPP_EQ if
22496 initialized with "= ..", CPP_OPEN_PAREN if initialized with
22497 "(...)". */
22512 /* Assume that this is not the declarator for a function
22513 definition. */
22517 /* Default arguments are only permitted for function parameters. */
22521 /* Defer access checks while parsing the declarator; we cannot know
22522 what names are accessible until we know what is being
22523 declared. */
22528 /* Parse the declarator. */
22529 declarator
22534 /* Gather up the deferred checks. */
22539 /* If the DECLARATOR was erroneous, there's no need to go
22540 further. */
22544 /* Check that the number of template-parameter-lists is OK. */
22554 /* Figure out what scope the entity declared by the DECLARATOR is
22555 located in. `grokdeclarator' sometimes changes the scope, so
22556 we compute it now. */
22559 /* Perform any lookups in the declared type which were thought to be
22560 dependent, but are not in the scope of the declarator. */
22561 decl_specifiers->type
22564 /* If we're allowing GNU extensions, look for an
22565 asm-specification. */
22567 {
22568 /* Look for an asm-specification. */
22571 }
22572 else
22575 /* Gather the attributes that were provided with the
22576 decl-specifiers. */
22579 /* Look for attributes. */
22583 /* Peek at the next token. */
22589 {
22590 /* Handle C++17 deduction guides. Note that class-scope
22591 non-template deduction guides are instead handled in
22592 cp_parser_member_declaration. */
22594 decl_specifiers,
22595 declarator,
22601 /* Check to see if the token indicates the start of a
22602 function-definition. */
22604 {
22606 {
22607 /* If a function-definition should not appear here, issue an
22608 error message. */
22612 }
22614 location_t func_brace_location
22617 /* Neither attributes nor an asm-specification are allowed
22618 on a function-definition. */
22621 "an %<asm%> specification is not allowed "
22625 "attributes are not allowed "
22627 /* This is a function-definition. */
22630 /* Parse the function definition. */
22633 decl_specifiers,
22634 declarator,
22635 prefix_attributes);
22636 else
22637 decl =
22638 (cp_parser_function_definition_from_specifiers_and_declarator
22642 {
22643 /* This is where the prologue starts... */
22646 }
22649 }
22650 }
22652 {
22653 /* A non-template declaration involving a function parameter list
22654 containing an implicit template parameter will be made into a
22655 template. If the resulting declaration is not going to be an
22656 actual function then finish the template scope here to prevent it.
22657 An error message will be issued once we have a decl to talk about.
22659 FIXME probably we should do type deduction rather than create an
22660 implicit template, but the standard currently doesn't allow it. */
22663 }
22665 /* [dcl.dcl]
22667 Only in function declarations for constructors, destructors, type
22668 conversions, and deduction guides can the decl-specifier-seq be omitted.
22670 We explicitly postpone this check past the point where we handle
22671 function-definitions because we tolerate function-definitions
22672 that are missing their return types in some modes. */
22674 {
22678 }
22680 /* An `=' or an '{' in C++11, indicate an initializer. An '(' may indicate
22681 an initializer as well. */
22685 {
22686 /* Don't get fooled into thinking that F(i)(1)(2) is an initializer.
22687 It isn't; it's an expression. (Here '(i)' would have already been
22688 parsed as a declarator.) */
22691 {
22698 /* If this is an initializer, only a ',' or ';' can follow: either
22699 we have another init-declarator, or we're at the end of an
22700 init-declarator-list which can only be followed by a ';'. */
22705 /* Not an init-declarator. */
22707 }
22719 {
22725 }
22726 }
22727 else
22728 {
22729 /* If the init-declarator isn't initialized and isn't followed by a
22730 `,' or `;', it's not a valid init-declarator. */
22733 {
22736 else
22737 {
22741 }
22742 }
22745 }
22747 /* Because start_decl has side-effects, we should only call it if we
22748 know we're going ahead. By this point, we know that we cannot
22749 possibly be looking at any other construct. */
22752 /* Enter the newly declared entry in the symbol table. If we're
22753 processing a declaration in a class-specifier, we wait until
22754 after processing the initializer. */
22756 {
22764 /* Adjust location of decl if declarator->id_loc is more appropriate:
22765 set, and decl wasn't merged with another decl, in which case its
22766 location would be different from input_location, and more accurate. */
22771 }
22773 /* Enter the SCOPE. That way unqualified names appearing in the
22774 initializer will be looked up in SCOPE. */
22777 /* Perform deferred access control checks, now that we know in which
22778 SCOPE the declared entity resides. */
22780 {
22783 /* If the entity being declared is a function, pretend that we
22784 are in its scope. If it is a `friend', it may have access to
22785 things that would not otherwise be accessible. */
22787 {
22790 }
22792 /* Perform access checks for template parameters. */
22795 /* Perform the access control checks for the declarator and the
22796 decl-specifiers. */
22799 /* Restore the saved value. */
22802 }
22804 /* Parse the initializer. */
22809 {
22811 {
22814 else
22815 {
22816 /* If the declaration was erroneous, we don't really
22817 know what the user intended, so just silently
22818 consume the initializer. */
22825 }
22826 }
22827 else
22828 {
22829 /* We want to record the extra mangling scope for in-class
22830 initializers of class members and initializers of static
22831 data member templates and namespace-scope initializers.
22832 The former involves deferring parsing of the initializer
22833 until end of class as with default arguments. So right
22834 here we only handle the latter two. */
22838 && !member_p
22851 }
22852 }
22854 /* The old parser allows attributes to appear after a parenthesized
22855 initializer. Mark Mitchell proposed removing this functionality
22856 on the GCC mailing lists on 2002-08-13. This parser accepts the
22857 attributes -- but ignores them. Made a permerror in GCC 8. */
22863 {
22866 {
22870 }
22871 }
22873 /* And now complain about a non-function implicit template. */
22878 /* For an in-class declaration, use `grokfield' to create the
22879 declaration. */
22881 {
22883 {
22886 }
22895 }
22897 /* Finish processing the declaration. But, skip member
22898 declarations. */
22900 {
22903 asm_specification,
22904 /* If the initializer is in parentheses, then this is
22905 a direct-initialization, which means that an
22906 `explicit' constructor is OK. Otherwise, an
22907 `explicit' constructor cannot be used. */
22910 }
22913 /* Core issue #226 (C++0x only): A default template-argument
22914 shall not be specified in a friend class template
22915 declaration. */
22924 {
22927 else
22929 }
22936 }
22938 /* Parse a declarator.
22940 declarator:
22941 direct-declarator
22942 ptr-operator declarator
22944 abstract-declarator:
22945 ptr-operator abstract-declarator [opt]
22946 direct-abstract-declarator
22948 GNU Extensions:
22950 declarator:
22951 attributes [opt] direct-declarator
22952 attributes [opt] ptr-operator declarator
22954 abstract-declarator:
22955 attributes [opt] ptr-operator abstract-declarator [opt]
22956 attributes [opt] direct-abstract-declarator
22958 The parser flags FLAGS is used to control type-specifier parsing.
22960 If CTOR_DTOR_OR_CONV_P is not NULL, *CTOR_DTOR_OR_CONV_P is used to
22961 detect constructors, destructors, deduction guides, or conversion operators.
22962 It is set to -1 if the declarator is a name, and +1 if it is a
22963 function. Otherwise it is set to zero. Usually you just want to
22964 test for >0, but internally the negative value is used.
22966 (The reason for CTOR_DTOR_OR_CONV_P is that a declaration must have
22967 a decl-specifier-seq unless it declares a constructor, destructor,
22968 or conversion. It might seem that we could check this condition in
22969 semantic analysis, rather than parsing, but that makes it difficult
22970 to handle something like `f()'. We want to notice that there are
22971 no decl-specifiers, and therefore realize that this is an
22972 expression, not a declaration.)
22974 If PARENTHESIZED_P is non-NULL, *PARENTHESIZED_P is set to true iff
22975 the declarator is a direct-declarator of the form "(...)".
22977 MEMBER_P is true iff this declarator is a member-declarator.
22979 FRIEND_P is true iff this declarator is a friend.
22981 STATIC_P is true iff the keyword static was seen. */
22985 cp_parser_declarator_kind dcl_kind,
22986 cp_parser_flags flags,
22990 {
22993 cp_cv_quals cv_quals;
22994 tree class_type;
22997 /* Assume this is not a constructor, destructor, or type-conversion
22998 operator. */
23005 /* Check for the ptr-operator production. */
23007 /* Parse the ptr-operator. */
23013 /* If that worked, then we have a ptr-operator. */
23015 {
23016 /* If a ptr-operator was found, then this declarator was not
23017 parenthesized. */
23020 /* The dependent declarator is optional if we are parsing an
23021 abstract-declarator. */
23025 /* Parse the dependent declarator. */
23031 /* If we are parsing an abstract-declarator, we must handle the
23032 case where the dependent declarator is absent. */
23037 declarator = cp_parser_make_indirect_declarator
23039 }
23040 /* Everything else is a direct-declarator. */
23041 else
23042 {
23045 CPP_OPEN_PAREN);
23049 }
23054 }
23056 /* Parse a direct-declarator or direct-abstract-declarator.
23058 direct-declarator:
23059 declarator-id
23060 direct-declarator ( parameter-declaration-clause )
23061 cv-qualifier-seq [opt]
23062 ref-qualifier [opt]
23063 exception-specification [opt]
23064 direct-declarator [ constant-expression [opt] ]
23065 ( declarator )
23067 direct-abstract-declarator:
23068 direct-abstract-declarator [opt]
23069 ( parameter-declaration-clause )
23070 cv-qualifier-seq [opt]
23071 ref-qualifier [opt]
23072 exception-specification [opt]
23073 direct-abstract-declarator [opt] [ constant-expression [opt] ]
23074 ( abstract-declarator )
23076 Returns a representation of the declarator. DCL_KIND is
23077 CP_PARSER_DECLARATOR_ABSTRACT, if we are parsing a
23078 direct-abstract-declarator. It is CP_PARSER_DECLARATOR_NAMED, if
23079 we are parsing a direct-declarator. It is
23080 CP_PARSER_DECLARATOR_EITHER, if we can accept either - in the case
23081 of ambiguity we prefer an abstract declarator, as per
23082 [dcl.ambig.res].
23083 The parser flags FLAGS is used to control type-specifier parsing.
23084 CTOR_DTOR_OR_CONV_P, MEMBER_P, FRIEND_P, and STATIC_P are
23085 as for cp_parser_declarator. */
23089 cp_parser_declarator_kind dcl_kind,
23090 cp_parser_flags flags,
23093 {
23104 {
23105 /* Peek at the next token. */
23108 {
23109 /* This is either a parameter-declaration-clause, or a
23110 parenthesized declarator. When we know we are parsing a
23111 named declarator, it must be a parenthesized declarator
23112 if FIRST is true. For instance, `(int)' is a
23113 parameter-declaration-clause, with an omitted
23114 direct-abstract-declarator. But `((*))', is a
23115 parenthesized abstract declarator. Finally, when T is a
23116 template parameter `(T)' is a
23117 parameter-declaration-clause, and not a parenthesized
23118 named declarator.
23120 We first try and parse a parameter-declaration-clause,
23121 and then try a nested declarator (if FIRST is true).
23123 It is not an error for it not to be a
23124 parameter-declaration-clause, even when FIRST is
23125 false. Consider,
23127 int i (int);
23128 int i (3);
23130 The first is the declaration of a function while the
23131 second is the definition of a variable, including its
23132 initializer.
23134 Having seen only the parenthesis, we cannot know which of
23135 these two alternatives should be selected. Even more
23136 complex are examples like:
23138 int i (int (a));
23139 int i (int (3));
23141 The former is a function-declaration; the latter is a
23142 variable initialization.
23144 Thus again, we try a parameter-declaration-clause, and if
23145 that fails, we back out and return. */
23148 {
23149 tree params;
23154 /* In a member-declarator, the only valid interpretation
23155 of a parenthesis is the start of a
23156 parameter-declaration-clause. (It is invalid to
23157 initialize a static data member with a parenthesized
23158 initializer; only the "=" form of initialization is
23159 permitted.) */
23163 /* Consume the `('. */
23165 matching_parens parens;
23168 {
23169 /* If this is going to be an abstract declarator, we're
23170 in a declarator and we can't have default args. */
23173 }
23177 /* Signal we are in the immediate function context. */
23181 /* Parse the parameter-declaration-clause. */
23182 params
23184 const location_t parens_end
23187 /* Consume the `)'. */
23190 /* If all went well, parse the cv-qualifier-seq,
23191 ref-qualifier and the exception-specification. */
23193 {
23194 cp_cv_quals cv_quals;
23195 cp_virt_specifiers virt_specifiers;
23196 cp_ref_qualifier ref_qual;
23197 tree exception_specification;
23198 tree late_return;
23199 tree attrs;
23202 unsigned char local_variables_forbidden_p
23204 /* 'this' is not allowed in static member functions. */
23214 /* Parse the cv-qualifier-seq. */
23216 /* Parse the ref-qualifier. */
23218 /* Parse the tx-qualifier. */
23224 /* DR 1207: 'this' is in scope after the cv-quals. */
23227 /* If it turned out that this is e.g. a pointer to a
23228 function, we don't want to delay noexcept parsing. */
23232 /* Parse the exception-specification. */
23233 exception_specification
23235 flags);
23239 cp_omp_declare_simd_data odsd;
23241 && declarator
23244 {
23248 }
23250 /* In here, we handle cases where attribute is used after
23251 the function declaration. For example:
23252 void func (int x) __attribute__((vector(..))); */
23255 late_return
23257 requires_clause);
23261 /* Parse the virt-specifier-seq. */
23265 parens_start,
23266 parens_end);
23267 /* Create the function-declarator. */
23269 params,
23270 cv_quals,
23271 virt_specifiers,
23272 ref_qual,
23273 tx_qual,
23274 exception_specification,
23275 late_return,
23276 requires_clause,
23277 parens_loc);
23280 /* Any subsequent parameter lists are to do with
23281 return type, so are not those of the declared
23282 function. */
23288 /* Restore the state of local_variables_forbidden_p. */
23289 parser->local_variables_forbidden_p
23291 }
23293 /* Remove the function parms from scope. */
23297 /* Repeat the main loop. */
23299 }
23301 /* If this is the first, we can try a parenthesized
23302 declarator. */
23304 {
23311 /* Consume the `('. */
23312 matching_parens parens;
23314 /* Parse the nested declarator. */
23317 declarator
23319 ctor_dtor_or_conv_p,
23325 /* Expect a `)'. */
23333 }
23334 /* Otherwise, we must be done. */
23335 else
23337 }
23341 {
23342 /* Parse an array-declarator. */
23352 /* Consume the `['. */
23354 /* Peek at the next token. */
23356 /* If the next token is `]', then there is no
23357 constant-expression. */
23359 {
23361 bounds
23373 {
23374 /* Normally, the array bound must be an integral constant
23375 expression. However, as an extension, we allow VLAs
23376 in function scopes as long as they aren't part of a
23377 parameter declaration. */
23381 }
23384 {
23385 /* Remember this wasn't a constant-expression. */
23388 }
23389 }
23390 else
23392 /* Look for the closing `]'. */
23394 {
23397 }
23402 }
23404 {
23405 {
23406 tree qualifying_scope;
23407 tree unqualified_name;
23408 tree attrs;
23409 special_function_kind sfk;
23414 /* Parse a declarator-id */
23417 {
23420 /* If we see an ellipsis, we should be looking at a
23421 parameter pack. */
23423 {
23424 /* Consume the `...' */
23428 }
23429 }
23432 unqualified_name
23436 {
23440 {
23441 /* Check whether an error occurred. */
23444 /* We already consumed the ellipsis to mark a
23445 parameter pack, but we have no way to report it,
23446 so abort the tentative parse. We will be exiting
23447 immediately anyway. */
23449 }
23450 else
23456 && (qualifying_scope
23458 {
23461 }
23462 }
23467 {
23472 }
23478 {
23479 /* In the declaration of a member of a template class
23480 outside of the class itself, the SCOPE will sometimes
23481 be a TYPENAME_TYPE. For example, given:
23483 template <typename T>
23484 int S<T>::R::i = 3;
23486 the SCOPE will be a TYPENAME_TYPE for `S<T>::R'. In
23487 this context, we must resolve S<T>::R to an ordinary
23488 type, rather than a typename type.
23490 The reason we normally avoid resolving TYPENAME_TYPEs
23491 is that a specialization of `S' might render
23492 `S<T>::R' not a type. However, if `S' is
23493 specialized, then this `i' will not be used, so there
23494 is no harm in resolving the types here. */
23495 tree type;
23497 /* Resolve the TYPENAME_TYPE. */
23500 /* If that failed, the declarator is invalid. */
23502 {
23505 "cannot define member of dependent typedef "
23507 else
23512 }
23514 }
23519 {
23520 tree class_type;
23525 else
23529 {
23533 {
23534 /* We do not attempt to print the declarator
23535 here because we do not have enough
23536 information about its original syntactic
23537 form. */
23541 }
23544 {
23548 "use %<%T::%D%> instead of %<%T::%D%> to "
23550 class_type,
23555 }
23557 }
23560 {
23567 for an unnamed type, even if the type
23568 got a name for linkage purposes. */
23570 /* Handle correctly (c++/19200):
23572 struct S {
23573 struct T{};
23574 friend void S(T);
23575 };
23577 and also:
23579 namespace N {
23580 void S();
23581 }
23583 struct S {
23584 friend void N::S();
23585 }; */
23588 class_type))
23597 }
23598 }
23600 unqualified_name,
23608 /* We're looking for this case in [temp.res]:
23609 A qualified-id is assumed to name a type if [...]
23610 - it is a decl-specifier of the decl-specifier-seq of a
23611 parameter-declaration in a declarator of a function or
23612 function template declaration, ... */
23618 {
23619 /* ...whose declarator-id is qualified. If it isn't, never
23620 assume the parameters to refer to types. */
23623 else
23624 {
23625 /* Now we have something like
23626 template <typename T> int C::x(S::p);
23627 which can be a function template declaration or a
23628 variable template definition. If name lookup for
23629 the declarator-id C::x finds one or more function
23630 templates, assume S::p to name a type. Otherwise,
23631 don't. */
23632 tree decl
23634 none_type,
23642 /* Allow
23643 template<typename T>
23644 A<T>::A(T::type) { } */
23647 qualifying_scope)))
23649 }
23650 }
23651 }
23653 handle_declarator:;
23656 {
23657 /* Any names that appear after the declarator-id for a
23658 member are looked up in the containing scope. */
23660 {
23661 /* But declarations with qualified-ids can't appear in a
23662 function. */
23666 }
23668 }
23672 /* Default args are only allowed on function
23673 declarations. */
23675 else
23679 }
23680 /* We're done. */
23681 else
23683 }
23685 /* For an abstract declarator, we might wind up with nothing at this
23686 point. That's an error; the declarator is not optional. */
23690 {
23691 /* Record overly parenthesized declarator so we can give a
23692 diagnostic about confusing decl/expr disambiguation. */
23694 {
23695 /* If the open and close parens are on different lines, this
23696 is probably a formatting thing, so ignore. */
23701 }
23706 }
23708 /* If we entered a scope, we must exit it now. */
23716 }
23718 /* Parse a ptr-operator.
23720 ptr-operator:
23721 * attribute-specifier-seq [opt] cv-qualifier-seq [opt] (C++11)
23722 * cv-qualifier-seq [opt]
23723 &
23724 :: [opt] nested-name-specifier * cv-qualifier-seq [opt]
23725 nested-name-specifier * attribute-specifier-seq [opt] cv-qualifier-seq [opt] (C++11)
23727 GNU Extension:
23729 ptr-operator:
23730 & cv-qualifier-seq [opt]
23732 Returns INDIRECT_REF if a pointer, or pointer-to-member, was used.
23733 Returns ADDR_EXPR if a reference was used, or NON_LVALUE_EXPR for
23734 an rvalue reference. In the case of a pointer-to-member, *TYPE is
23735 filled in with the TYPE containing the member. *CV_QUALS is
23736 filled in with the cv-qualifier-seq, or TYPE_UNQUALIFIED, if there
23737 are no cv-qualifiers. Returns ERROR_MARK if an error occurred.
23738 Note that the tree codes returned by this function have nothing
23739 to do with the types of trees that will be eventually be created
23740 to represent the pointer or reference type being parsed. They are
23741 just constants with suggestive names. */
23742 static enum tree_code
23747 {
23752 /* Assume that it's not a pointer-to-member. */
23754 /* And that there are no cv-qualifiers. */
23757 /* Peek at the next token. */
23760 /* If it's a `*', `&' or `&&' we have a pointer or reference. */
23770 {
23771 /* Consume the `*', `&' or `&&'. */
23774 /* A `*' can be followed by a cv-qualifier-seq, and so can a
23775 `&', if we are allowing GNU extensions. (The only qualifier
23776 that can legally appear after `&' is `restrict', but that is
23777 enforced during semantic analysis. */
23785 }
23786 else
23787 {
23788 /* Try the pointer-to-member case. */
23790 /* Look for the optional `::' operator. */
23793 /* Look for the nested-name specifier. */
23800 /* If we found it, and the next token is a `*', then we are
23801 indeed looking at a pointer-to-member operator. */
23804 {
23805 /* Indicate that the `*' operator was used. */
23813 else
23814 {
23815 /* The type of which the member is a member is given by the
23816 current SCOPE. */
23818 /* The next name will not be qualified. */
23822 /* Look for optional c++11 attributes. */
23826 /* Look for the optional cv-qualifier-seq. */
23828 }
23829 }
23830 /* If that didn't work we don't have a ptr-operator. */
23833 }
23836 }
23838 /* Parse an (optional) cv-qualifier-seq.
23840 cv-qualifier-seq:
23841 cv-qualifier cv-qualifier-seq [opt]
23843 cv-qualifier:
23844 const
23845 volatile
23847 GNU Extension:
23849 cv-qualifier:
23850 __restrict__
23852 Returns a bitmask representing the cv-qualifiers. */
23854 static cp_cv_quals
23856 {
23860 {
23862 cp_cv_quals cv_qualifier;
23864 /* Peek at the next token. */
23866 /* See if it's a cv-qualifier. */
23868 {
23884 }
23890 {
23895 }
23896 else
23897 {
23900 }
23901 }
23904 }
23906 /* Parse an (optional) ref-qualifier
23908 ref-qualifier:
23909 &
23910 &&
23912 Returns cp_ref_qualifier representing ref-qualifier. */
23914 static cp_ref_qualifier
23916 {
23919 /* Don't try to parse bitwise '&' as a ref-qualifier (c++/57532). */
23924 {
23929 {
23941 }
23946 {
23949 }
23950 else
23951 {
23954 }
23955 }
23958 }
23960 /* Parse an optional tx-qualifier.
23962 tx-qualifier:
23963 transaction_safe
23964 transaction_safe_dynamic */
23966 static tree
23968 {
23971 {
23976 {
23980 {
23983 {
23986 }
23987 else
23989 }
23990 }
23991 }
23993 }
23995 /* Parse an (optional) virt-specifier-seq.
23997 virt-specifier-seq:
23998 virt-specifier virt-specifier-seq [opt]
24000 virt-specifier:
24001 override
24002 final
24004 Returns a bitmask representing the virt-specifiers. */
24006 static cp_virt_specifiers
24008 {
24012 {
24014 cp_virt_specifiers virt_specifier;
24016 /* Peek at the next token. */
24018 /* See if it's a virt-specifier-qualifier. */
24022 {
24025 }
24027 {
24030 }
24032 {
24034 }
24035 else
24039 {
24044 }
24045 else
24046 {
24049 }
24050 }
24052 }
24054 /* Used by handling of trailing-return-types and NSDMI, in which 'this'
24055 is in scope even though it isn't real. */
24057 void
24059 {
24060 tree this_parm;
24063 {
24064 /* We don't clear this between NSDMIs. Is it already what we want? */
24071 }
24074 /* Clear this first to avoid shortcut in cp_build_indirect_ref. */
24076 current_class_ref
24079 }
24081 /* Return true iff our current scope is a non-static data member
24082 initializer. */
24084 bool
24086 {
24087 /* We recognize NSDMI context by the context-less 'this' pointer set up
24088 by the function above. */
24094 }
24096 /* True if we're parsing a function declarator. */
24098 bool
24100 {
24101 /* this_entity is NULL for a function parameter scope while parsing the
24102 declarator; it is set when parsing the body of the function. */
24105 }
24107 /* Parse a late-specified return type, if any. This is not a separate
24108 non-terminal, but part of a function declarator, which looks like
24110 -> trailing-type-specifier-seq abstract-declarator(opt)
24112 Returns the type indicated by the type-id.
24114 In addition to this, parse any queued up #pragma omp declare simd
24115 clauses, and #pragma acc routine clauses.
24117 QUALS is either a bitmask of cv_qualifiers or -1 for a non-member
24118 function. */
24120 static tree
24123 {
24127 && declarator
24131 && declarator
24134 /* Peek at the next token. */
24136 /* A late-specified return type is indicated by an initial '->'. */
24145 {
24146 /* Consume the ->. */
24150 }
24152 /* Function declarations may be followed by a trailing
24153 requires-clause. */
24157 declarator->attributes
24161 declarator->attributes
24166 }
24168 /* Parse a declarator-id.
24170 declarator-id:
24171 id-expression
24172 :: [opt] nested-name-specifier [opt] type-name
24174 In the `id-expression' case, the value returned is as for
24175 cp_parser_id_expression if the id-expression was an unqualified-id.
24176 If the id-expression was a qualified-id, then a SCOPE_REF is
24177 returned. The first operand is the scope (either a NAMESPACE_DECL
24178 or TREE_TYPE), but the second is still just a representation of an
24179 unqualified-id. */
24181 static tree
24183 {
24184 tree id;
24185 /* The expression must be an id-expression. Assume that qualified
24186 names are the names of types so that:
24188 template <class T>
24189 int S<T>::R::i = 3;
24191 will work; we must treat `S<T>::R' as the name of a type.
24192 Similarly, assume that qualified names are templates, where
24193 required, so that:
24195 template <class T>
24196 int S<T>::R<T>::i = 3;
24198 will work, too. */
24204 optional_p);
24208 }
24210 /* Parse a type-id.
24212 type-id:
24213 type-specifier-seq abstract-declarator [opt]
24215 The parser flags FLAGS is used to control type-specifier parsing.
24217 If IS_TEMPLATE_ARG is true, we are parsing a template argument.
24219 If IS_TRAILING_RETURN is true, we are in a trailing-return-type,
24220 i.e. we've just seen "->".
24222 Returns the TYPE specified. */
24224 static tree
24228 {
24229 cp_decl_specifier_seq type_specifier_seq;
24232 /* Parse the type-specifier-seq. */
24235 is_trailing_return,
24243 /* A bare template name as a template argument is a template template
24244 argument, not a placeholder, so fail parsing it as a type argument. */
24245 {
24249 }
24253 /* There might or might not be an abstract declarator. */
24255 /* Look for the declarator. */
24256 abstract_declarator
24263 /* Check to see if there really was a declarator. */
24268 /* The concepts TS allows 'auto' as a type-id. */
24271 /* DR 625 prohibits use of auto as a template-argument. We allow 'auto'
24272 outside the template-argument-list context here only for the sake of
24273 diagnostic: grokdeclarator then can emit a better error message for
24274 e.g. using T = auto. */
24280 && !auto_typeid_ok
24281 /* None of the valid uses of 'auto' in C++14 involve the type-id
24282 nonterminal, but it is valid in a trailing-return-type. */
24285 {
24286 /* A type-id with type 'auto' is only ok if the abstract declarator
24287 is a function declarator with a late-specified return type.
24289 A type-id with 'auto' is also valid in a trailing-return-type
24290 in a compound-requirement. */
24297 else
24298 {
24300 {
24303 {
24305 auto_node);
24307 tmpl);
24308 }
24311 auto_node);
24312 else
24314 }
24316 }
24317 }
24320 is_template_arg);
24321 }
24323 /* Wrapper for cp_parser_type_id_1. */
24325 static tree
24328 {
24330 }
24332 /* Wrapper for cp_parser_type_id_1. */
24334 static tree
24336 {
24337 tree r;
24339 parser->type_definition_forbidden_message
24344 {
24347 }
24349 }
24351 /* Wrapper for cp_parser_type_id_1. */
24353 static tree
24355 {
24358 }
24360 /* Parse a type-specifier-seq.
24362 type-specifier-seq:
24363 type-specifier type-specifier-seq [opt]
24365 GNU extension:
24367 type-specifier-seq:
24368 attributes type-specifier-seq [opt]
24370 The parser flags FLAGS is used to control type-specifier parsing.
24372 If IS_DECLARATION is true, we are at the start of a "condition" or
24373 exception-declaration, so we might be followed by a declarator-id.
24375 If IS_TRAILING_RETURN is true, we are in a trailing-return-type,
24376 i.e. we've just seen "->".
24378 Sets *TYPE_SPECIFIER_SEQ to represent the sequence. */
24380 static void
24382 cp_parser_flags flags,
24386 {
24390 /* Clear the TYPE_SPECIFIER_SEQ. */
24394 /* In the context of a trailing return type, enum E { } is an
24395 elaborated-type-specifier followed by a function-body, not an
24396 enum-specifier. */
24400 /* Parse the type-specifiers and attributes. */
24402 {
24403 tree type_specifier;
24406 /* Check for attributes first. */
24408 {
24409 /* GNU attributes at the end of a declaration apply to the
24410 declaration as a whole, not to the trailing return type. So look
24411 ahead to see if these attributes are at the end. */
24414 {
24420 }
24421 type_specifier_seq->attributes
24425 }
24427 /* record the token of the beginning of the type specifier seq,
24428 for error reporting purposes*/
24432 /* Look for the type-specifier. */
24434 flags,
24435 type_specifier_seq,
24437 NULL,
24440 {
24441 /* If the first type-specifier could not be found, this is not a
24442 type-specifier-seq at all. */
24444 {
24445 /* Set in_declarator_p to avoid skipping to the semicolon. */
24457 }
24458 /* If subsequent type-specifiers could not be found, the
24459 type-specifier-seq is complete. */
24461 }
24464 /* The standard says that a condition can be:
24466 type-specifier-seq declarator = assignment-expression
24468 However, given:
24470 struct S {};
24471 if (int S = ...)
24473 we should treat the "S" as a declarator, not as a
24474 type-specifier. The standard doesn't say that explicitly for
24475 type-specifier-seq, but it does say that for
24476 decl-specifier-seq in an ordinary declaration. Perhaps it
24477 would be clearer just to allow a decl-specifier-seq here, and
24478 then add a semantic restriction that if any decl-specifiers
24479 that are not type-specifiers appear, the program is invalid. */
24482 }
24483 }
24485 /* Return whether the function currently being declared has an associated
24486 template parameter list. */
24488 static bool
24490 {
24503 }
24505 /* Parse a parameter-declaration-clause.
24507 parameter-declaration-clause:
24508 parameter-declaration-list [opt] ... [opt]
24509 parameter-declaration-list , ...
24511 The parser flags FLAGS is used to control type-specifier parsing.
24513 Returns a representation for the parameter declarations. A return
24514 value of NULL indicates a parameter-declaration-clause consisting
24515 only of an ellipsis. */
24517 static tree
24519 cp_parser_flags flags)
24520 {
24521 tree parameters;
24529 && !processing_template_parmlist
24530 && !processing_explicit_instantiation
24531 /* default_arg_ok_p tracks whether this is a parameter-clause for an
24532 actual function or a random abstract declarator. */
24538 /* Peek at the next token. */
24540 /* Check for trivial parameter-declaration-clauses. */
24542 {
24543 /* Consume the `...' token. */
24546 }
24548 /* There are no parameters. */
24550 /* Check for `(void)', too, which is a special case. */
24554 {
24555 /* Consume the `void' token. */
24557 /* There are no parameters. */
24559 }
24561 /* A vector of parameters that haven't been pushed yet. */
24564 /* Parse the parameter-declaration-list. */
24567 /* If a parse error occurred while parsing the
24568 parameter-declaration-list, then the entire
24569 parameter-declaration-clause is erroneous. */
24573 /* Peek at the next token. */
24575 /* If it's a `,', the clause should terminate with an ellipsis. */
24577 {
24578 /* Consume the `,'. */
24580 /* Expect an ellipsis. */
24581 ellipsis_p
24583 }
24584 /* It might also be `...' if the optional trailing `,' was
24585 omitted. */
24587 {
24588 /* Consume the `...' token. */
24590 /* And remember that we saw it. */
24592 }
24593 else
24596 /* A valid parameter-declaration-clause can only be followed by a ')'.
24597 So it's time to push all the parameters we have seen now that we
24598 know we have a valid declaration. Note that here we may not have
24599 committed yet, nor should we. Pushing here will detect the error
24600 of redefining a parameter. */
24605 /* Finish the parameter list. */
24610 }
24612 /* Parse a parameter-declaration-list.
24614 parameter-declaration-list:
24615 parameter-declaration
24616 parameter-declaration-list , parameter-declaration
24618 The parser flags FLAGS is used to control type-specifier parsing.
24619 PENDING_DECLS is a vector of parameters that haven't been pushed yet.
24621 Returns a representation of the parameter-declaration-list, as for
24622 cp_parser_parameter_declaration_clause. However, the
24623 `void_list_node' is never appended to the list. */
24625 static tree
24627 cp_parser_flags flags,
24629 {
24635 /* The special considerations that apply to a function within an
24636 unbraced linkage specifications do not apply to the parameters
24637 to the function. */
24638 saved_in_unbraced_linkage_specification_p
24642 /* Look for more parameters. */
24644 {
24649 /* Parse the parameter. */
24650 parameter
24655 /* We don't know yet if the enclosing context is unavailable or deprecated,
24656 so wait and deal with it in grokparms if appropriate. */
24660 {
24663 PARM,
24668 }
24672 /* If a parse error occurred parsing the parameter declaration,
24673 then the entire parameter-declaration-list is erroneous. */
24675 {
24678 }
24685 {
24686 /* We cannot always pushdecl while parsing tentatively because
24687 it may have side effects and we can't be sure yet if we're
24688 parsing a declaration, e.g.:
24690 S foo(int(x), int(x), int{x});
24692 where it's not clear if we're dealing with a constructor call
24693 or a function declaration until we've seen the last argument
24694 which breaks it up.
24695 It's safe to pushdecl so long as it doesn't result in a clash
24696 with an already-pushed parameter. But we don't delay pushing
24697 different parameters to handle
24699 S foo(int(i), decltype(i) j = 42);
24701 which is valid. */
24704 /* See if PARAMETERS already contains a parameter with the same
24705 DECL_NAME as DECL. */
24711 }())
24713 else
24715 }
24718 {
24722 }
24724 /* Add the new parameter to the list. */
24728 /* If the parameters were parenthesized, it's the case of
24729 T foo(X(x)) which looks like a variable definition but
24730 is a function declaration. */
24734 /* Peek at the next token. */
24737 /* These are for Objective-C++ */
24740 /* The parameter-declaration-list is complete. */
24743 {
24746 /* Peek at the next token. */
24748 /* If it's an ellipsis, then the list is complete. */
24751 /* Otherwise, there must be more parameters. Consume the
24752 `,'. */
24754 /* When parsing something like:
24756 int i(float f, double d)
24758 we can tell after seeing the declaration for "f" that we
24759 are not looking at an initialization of a variable "i",
24760 but rather at the declaration of a function "i".
24762 Due to the fact that the parsing of template arguments
24763 (as specified to a template-id) requires backtracking we
24764 cannot use this technique when inside a template argument
24765 list. */
24769 /* However, a parameter-declaration of the form
24770 "float(f)" (which is a valid declaration of a
24771 parameter "f") can also be interpreted as an
24772 expression (the conversion of "f" to "float"). */
24775 }
24776 else
24777 {
24785 }
24786 }
24788 parser->in_unbraced_linkage_specification_p
24791 /* Reset implicit_template_scope if we are about to leave the function
24792 parameter list that introduced it. Note that for out-of-line member
24793 definitions, there will be one or more class scopes before we get to
24794 the template parameter scope. */
24798 {
24802 {
24805 }
24806 }
24809 }
24811 /* Parse a parameter declaration.
24813 parameter-declaration:
24814 decl-specifier-seq ... [opt] declarator
24815 decl-specifier-seq declarator = assignment-expression
24816 decl-specifier-seq ... [opt] abstract-declarator [opt]
24817 decl-specifier-seq abstract-declarator [opt] = assignment-expression
24819 The parser flags FLAGS is used to control type-specifier parsing.
24821 If TEMPLATE_PARM_P is TRUE, then this parameter-declaration
24822 declares a template parameter. (In that case, a non-nested `>'
24823 token encountered during the parsing of the assignment-expression
24824 is not interpreted as a greater-than operator.)
24826 Returns a representation of the parameter, or NULL if an error
24827 occurs. If PARENTHESIZED_P is non-NULL, *PARENTHESIZED_P is set to
24828 true iff the declarator is of the form "(p)". */
24832 cp_parser_flags flags,
24835 {
24837 cp_decl_specifier_seq decl_specifiers;
24839 tree default_argument;
24844 /* In a template parameter, `>' is not an operator.
24846 [temp.param]
24848 When parsing a default template-argument for a non-type
24849 template-parameter, the first non-nested `>' is taken as the end
24850 of the template parameter-list rather than a greater-than
24851 operator. */
24853 /* Type definitions may not appear in parameter types. */
24855 parser->type_definition_forbidden_message
24862 /* Parse the declaration-specifiers. */
24865 flags,
24869 /* [dcl.spec.auto.general]: "A placeholder-type-specifier of the form
24870 type-constraint opt auto can be used as a decl-specifier of the
24871 decl-specifier-seq of a parameter-declaration of a function declaration
24872 or lambda-expression..." but we must not synthesize an implicit template
24873 type parameter in its declarator. That is, in "void f(auto[auto{10}]);"
24874 we want to synthesize only the first auto. */
24878 /* Complain about missing 'typename' or other invalid type names. */
24883 /* If an error occurred, there's no reason to attempt to parse the
24884 rest of the declaration. */
24886 {
24889 }
24891 /* Peek at the next token. */
24894 /* If the next token is a `)', `,', `=', `>', or `...', then there
24895 is no declarator. However, when variadic templates are enabled,
24896 there may be a declarator following `...'. */
24901 {
24905 }
24906 /* Otherwise, there should be a declarator. */
24907 else
24908 {
24912 /* After seeing a decl-specifier-seq, if the next token is not a
24913 "(" or "{", there is no possibility that the code is a valid
24914 expression. Therefore, if parsing tentatively, we commit at
24915 this point. */
24917 /* In an expression context, having seen:
24919 (int((char ...
24921 we cannot be sure whether we are looking at a
24922 function-type (taking a "char" as a parameter) or a cast
24923 of some object of type "char" to "int". */
24927 {
24929 {
24932 /* This is a CTAD expression, not a parameter declaration. */
24934 }
24935 else
24937 }
24938 /* Parse the declarator. */
24941 CP_PARSER_DECLARATOR_EITHER,
24942 CP_PARSER_FLAGS_NONE,
24944 parenthesized_p,
24949 /* After the declarator, allow more attributes. */
24950 decl_specifiers.attributes
24954 /* If the declarator is a template parameter pack, remember that and
24955 clear the flag in the declarator itself so we don't get errors
24956 from grokdeclarator. */
24958 {
24961 }
24962 }
24964 /* If the next token is an ellipsis, and we have not seen a declarator
24965 name, and if either the type of the declarator contains parameter
24966 packs but it is not a TYPE_PACK_EXPANSION or is null (this happens
24967 for, eg, abbreviated integral type names), then we actually have a
24968 parameter pack expansion expression. Otherwise, leave the ellipsis
24969 for a C-style variadic function. */
24972 /* If a function parameter pack was specified and an implicit template
24973 parameter was introduced during cp_parser_parameter_declaration,
24974 change any implicit parameters introduced into packs. */
24979 {
24987 }
24990 {
25001 {
25002 /* Consume the `...'. */
25006 /* Build a pack expansion type */
25011 else
25013 }
25014 }
25016 /* The restriction on defining new types applies only to the type
25017 of the parameter, not to the default argument. */
25020 /* If the next token is `=', then process a default argument. */
25022 {
25027 /* If we are defining a class, then the tokens that make up the
25028 default argument must be saved and processed later. */
25034 /* A constrained-type-specifier may declare a type
25035 template-parameter. */
25037 default_argument
25040 /* A constrained-type-specifier may declare a
25041 template-template-parameter. */
25043 default_argument
25046 /* Outside of a class definition, we can just parse the
25047 assignment-expression. */
25048 else
25049 default_argument
25053 {
25055 "default arguments are only "
25057 }
25059 || template_parameter_pack_p
25062 {
25063 /* Find the name of the parameter pack. */
25070 template_parm_p
25076 else
25078 template_parm_p
25085 }
25086 }
25087 else
25093 /* Generate a location for the parameter, ranging from the start of the
25094 initial token to the end of the final token (using input_location for
25095 the latter, set up by cp_lexer_set_source_position_from_token when
25096 consuming tokens).
25098 If we have a identifier, then use it for the caret location, e.g.
25100 extern int callee (int one, int (*two)(int, int), float three);
25101 ~~~~~~^~~~~~~~~~~~~~
25103 otherwise, reuse the start location for the caret location e.g.:
25105 extern int callee (int one, int (*)(int, int), float three);
25106 ^~~~~~~~~~~~~~~~~
25108 */
25114 input_location);
25117 declarator,
25118 default_argument,
25119 param_loc,
25120 template_parameter_pack_p);
25121 }
25123 /* Parse a default argument and return it.
25125 TEMPLATE_PARM_P is true if this is a default argument for a
25126 non-type template parameter. */
25127 static tree
25129 {
25135 /* Make sure that PARSER->GREATER_THAN_IS_OPERATOR_P is
25136 set correctly. */
25143 /* Local variable names (and the `this' keyword) may not
25144 appear in a default argument. */
25147 /* Parse the assignment-expression. */
25152 /* The "this" pointer is not valid in a default argument. */
25154 {
25159 }
25160 default_argument
25162 /* Restore the "this" pointer. */
25164 {
25167 }
25176 }
25178 /* Parse a function-body.
25180 function-body:
25181 compound_statement */
25183 static void
25185 {
25189 }
25191 /* Parse a ctor-initializer-opt followed by a function-body. Return
25192 true if a ctor-initializer was present. When IN_FUNCTION_TRY_BLOCK
25193 is true we are parsing a function-try-block. */
25195 static void
25198 {
25200 const bool check_body_p
25208 {
25211 "function-try-block body of %<constexpr%> constructor only "
25213 else
25215 "function-try-block body of %<constexpr%> function only "
25217 }
25219 /* Begin the function body. */
25221 /* Parse the optional ctor-initializer. */
25224 /* If we're parsing a constexpr constructor definition, we need
25225 to check that the constructor body is indeed empty. However,
25226 before we get to cp_parser_function_body lot of junk has been
25227 generated, so we can't just check that we have an empty block.
25228 Rather we take a snapshot of the outermost block, and check whether
25229 cp_parser_function_body changed its state. */
25231 {
25235 }
25236 /* Parse the function-body. */
25240 /* Finish the function body. */
25242 }
25244 /* Parse an initializer.
25246 initializer:
25247 = initializer-clause
25248 ( expression-list )
25250 Returns an expression representing the initializer. If no
25251 initializer is present, NULL_TREE is returned.
25253 *IS_DIRECT_INIT is set to FALSE if the `= initializer-clause'
25254 production is used, and TRUE otherwise. *IS_DIRECT_INIT is
25255 set to TRUE if there is no initializer present. If there is an
25256 initializer, and it is not a constant-expression, *NON_CONSTANT_P
25257 is set to true; otherwise it is set to false. */
25259 static tree
25262 {
25264 tree init;
25266 /* Peek at the next token. */
25269 /* Let our caller know whether or not this initializer was
25270 parenthesized. */
25272 /* Assume that the initializer is constant. */
25276 {
25277 /* Consume the `='. */
25279 /* Parse the initializer-clause. */
25281 }
25283 {
25288 non_constant_p);
25293 }
25295 {
25300 }
25301 else
25302 {
25303 /* Anything else is an error. */
25306 }
25312 }
25314 /* Parse an initializer-clause.
25316 initializer-clause:
25317 assignment-expression
25318 braced-init-list
25320 Returns an expression representing the initializer.
25322 If the `assignment-expression' production is used the value
25323 returned is simply a representation for the expression.
25325 Otherwise, calls cp_parser_braced_list. */
25327 static cp_expr
25329 {
25330 cp_expr initializer;
25332 /* Assume the expression is constant. */
25335 /* If it is not a `{', then we are looking at an
25336 assignment-expression. */
25338 {
25339 initializer
25342 non_constant_p);
25343 }
25344 else
25348 }
25350 /* Parse a brace-enclosed initializer list.
25352 braced-init-list:
25353 { initializer-list , [opt] }
25354 { designated-initializer-list , [opt] }
25355 { }
25357 Returns a CONSTRUCTOR. The CONSTRUCTOR_ELTS will be
25358 the elements of the initializer-list (or NULL, if the last
25359 production is used). The TREE_TYPE for the CONSTRUCTOR will be
25360 NULL_TREE. There is no way to detect whether or not the optional
25361 trailing `,' was provided. NON_CONSTANT_P is as for
25362 cp_parser_initializer. */
25364 static cp_expr
25366 {
25367 tree initializer;
25370 /* Consume the `{' token. */
25371 matching_braces braces;
25373 /* Create a CONSTRUCTOR to represent the braced-initializer. */
25375 /* If it's not a `}', then there is a non-trivial initializer. */
25377 {
25379 /* Parse the initializer list. */
25383 /* A trailing `,' token is allowed. */
25386 }
25387 else
25389 /* Now, there should be a trailing `}'. */
25395 /* Build a location of the form:
25396 { ... }
25397 ^~~~~~~
25398 with caret==start at the open brace, finish at the close brace. */
25402 }
25404 /* Consume tokens up to, and including, the next non-nested closing `]'.
25405 Returns true iff we found a closing `]'. */
25407 static bool
25409 {
25413 {
25417 {
25421 /* FALLTHRU */
25423 /* If we've run out of tokens, then there is no closing `]'. */
25432 {
25435 }
25440 }
25442 /* Consume the token. */
25444 }
25445 }
25447 /* Return true if we are looking at an array-designator, false otherwise. */
25449 static bool
25451 {
25452 /* Consume the `['. */
25457 /* Skip tokens until the next token is a closing square bracket.
25458 If we find the closing `]', and the next token is a `=', then
25459 we are looking at an array designator. */
25460 bool array_designator_p
25464 /* Roll back the tokens we skipped. */
25468 }
25470 /* Parse an initializer-list.
25472 initializer-list:
25473 initializer-clause ... [opt]
25474 initializer-list , initializer-clause ... [opt]
25476 C++20 Extension:
25478 designated-initializer-list:
25479 designated-initializer-clause
25480 designated-initializer-list , designated-initializer-clause
25482 designated-initializer-clause:
25483 designator brace-or-equal-initializer
25485 designator:
25486 . identifier
25488 GNU Extension:
25490 initializer-list:
25491 designation initializer-clause ...[opt]
25492 initializer-list , designation initializer-clause ...[opt]
25494 designation:
25495 . identifier =
25496 identifier :
25497 [ constant-expression ] =
25499 Returns a vec of constructor_elt. The VALUE of each elt is an expression
25500 for the initializer. If the INDEX of the elt is non-NULL, it is the
25501 IDENTIFIER_NODE naming the field to initialize. NON_CONSTANT_P is
25502 as for cp_parser_initializer. Set *DESIGNATED to a boolean whether there
25503 are any designators. */
25508 {
25513 /* Assume all of the expressions are constant. */
25519 /* Parse the rest of the list. */
25521 {
25523 tree designator;
25524 tree initializer;
25528 /* Handle the C++20 syntax, '. id ='. */
25536 {
25539 "C++ designated initializers only available with "
25541 /* Consume the `.'. */
25543 /* Consume the identifier. */
25546 /* Consume the `='. */
25548 }
25549 /* Also, if the next token is an identifier and the following one is a
25550 colon, we are looking at the GNU designated-initializer
25551 syntax. */
25556 {
25557 /* Warn the user that they are using an extension. */
25560 /* Consume the identifier. */
25562 /* Consume the `:'. */
25564 }
25565 /* Also handle C99 array designators, '[ const ] ='. */
25569 {
25570 /* In C++11, [ could start a lambda-introducer. */
25576 {
25579 }
25580 else
25581 {
25586 }
25591 && (!require_potential_rvalue_constant_expression
25595 /* Warn the user that they are using an extension. */
25598 }
25599 else
25603 {
25606 }
25610 {
25614 }
25618 /* Parse the initializer. */
25621 /* If any clause is non-constant, so is the entire initializer. */
25625 /* If we have an ellipsis, this is an initializer pack
25626 expansion. */
25628 {
25631 /* Consume the `...'. */
25638 /* Turn the initializer into an initializer expansion. */
25640 }
25642 /* Add it to the vector. */
25645 /* If the next token is not a comma, we have reached the end of
25646 the list. */
25650 /* Peek at the next token. */
25652 /* If the next token is a `}', then we're still done. An
25653 initializer-clause can have a trailing `,' after the
25654 initializer-list and before the closing `}'. */
25658 /* Suppress location wrappers in a long initializer to save memory
25659 (14179). The cutoff is chosen arbitrarily. */
25663 /* Look one level down because it's easy. Looking deeper would require
25664 passing down a nelts pointer, and I don't think multi-level massive
25665 initializers are common enough to justify this. */
25671 /* Consume the `,' token. */
25673 }
25675 /* The same identifier shall not appear in multiple designators
25676 of a designated-initializer-list. */
25678 {
25683 {
25685 {
25687 "%<.%s%> designator used multiple times in "
25691 }
25692 else
25694 }
25698 }
25704 }
25706 /* Classes [gram.class] */
25708 /* Parse a class-name.
25710 class-name:
25711 identifier
25712 template-id
25714 TYPENAME_KEYWORD_P is true iff the `typename' keyword has been used
25715 to indicate that names looked up in dependent types should be
25716 assumed to be types. TEMPLATE_KEYWORD_P is true iff the `template'
25717 keyword has been used to indicate that the name that appears next
25718 is a template. TAG_TYPE indicates the explicit tag given before
25719 the type name, if any. If CHECK_DEPENDENCY_P is FALSE, names are
25720 looked up in dependent scopes. If CLASS_HEAD_P is TRUE, this class
25721 is the class being defined in a class-head. If ENUM_OK is TRUE,
25722 enum-names are also accepted.
25724 Returns the TYPE_DECL representing the class. */
25726 static tree
25735 {
25736 tree decl;
25739 /* All class-names start with an identifier. */
25742 {
25745 }
25747 /* PARSER->SCOPE can be cleared when parsing the template-arguments
25748 to a template-id, so we save it here. Consider object scope too,
25749 so that make_typename_type below can use it (cp_parser_template_name
25750 considers object scope also). This may happen with code like
25752 p->template A<T>::a()
25754 where we first want to look up A<T>::a in the class of the object
25755 expression, as per [basic.lookup.classref]. */
25757 /* This only checks parser->scope to avoid duplicate errors; if
25758 ->object_type is erroneous, go on to give a parse error. */
25762 /* Any name names a type if we're following the `typename' keyword
25763 in a qualified name where the enclosing scope is type-dependent. */
25768 /* Handle the common case (an identifier, but not a template-id)
25769 efficiently. */
25772 {
25776 /* Look for the identifier. */
25780 /* If the next token isn't an identifier, we are certainly not
25781 looking at a class-name. */
25784 /* If we know this is a type-name, there's no need to look it
25785 up. */
25788 else
25789 {
25790 tree ambiguous_decls;
25791 /* If we already know that this lookup is ambiguous, then
25792 we've already issued an error message; there's no reason
25793 to check again. */
25795 {
25798 }
25799 /* If the next token is a `::', then the name must be a type
25800 name.
25802 [basic.lookup.qual]
25804 During the lookup for a name preceding the :: scope
25805 resolution operator, object, function, and enumerator
25806 names are ignored. */
25809 /* Look up the name. */
25811 tag_type,
25814 check_dependency_p,
25818 {
25822 }
25823 }
25824 }
25825 else
25826 {
25827 /* Try a template-id. */
25829 check_dependency_p,
25830 tag_type,
25831 is_declaration);
25834 }
25838 /* If this is a typename, create a TYPENAME_TYPE. */
25840 {
25845 }
25849 /* Check to see that it is really the name of a class. */
25853 /* Situations like this:
25855 template <typename T> struct A {
25856 typename T::template X<int>::I i;
25857 };
25859 are problematic. Is `T::template X<int>' a class-name? The
25860 standard does not seem to be definitive, but there is no other
25861 valid interpretation of the following `::'. Therefore, those
25862 names are considered class-names. */
25863 {
25867 }
25872 /* In Objective-C 2.0, a classname followed by '.' starts a
25873 dot-syntax expression, and it's not a type-name. */
25885 }
25887 /* Make sure that any member-function parameters are in scope.
25888 For instance, a function's noexcept-specifier can use the function's
25889 parameters:
25891 struct S {
25892 void fn (int p) noexcept(noexcept(p));
25893 };
25895 so we need to make sure name lookup can find them. This is used
25896 when we delay parsing of the noexcept-specifier. */
25898 static void
25900 {
25907 {
25911 }
25912 }
25914 /* Undo the effects of inject_parm_decls. */
25916 static void
25918 {
25921 }
25923 /* Parse a class-specifier.
25925 class-specifier:
25926 class-head { member-specification [opt] }
25928 Returns the TREE_TYPE representing the class. */
25930 static tree
25932 {
25933 tree type;
25947 /* Parse the class-head. */
25950 /* If the class-head was a semantic disaster, skip the entire body
25951 of the class. */
25953 {
25957 }
25959 /* Look for the `{'. */
25960 matching_braces braces;
25962 {
25965 }
25970 /* Issue an error message if type-definitions are forbidden here. */
25972 /* Remember that we are defining one more class. */
25974 /* Inside the class, surrounding template-parameter-lists do not
25975 apply. */
25976 saved_num_template_parameter_lists
25979 /* We are not in a function body. */
25982 /* Or in a loop. */
25985 /* Or in a switch. */
25988 /* We are not immediately inside an extern "lang" block. */
25989 saved_in_unbraced_linkage_specification_p
25993 /* Start the class. */
25995 {
25997 /* SCOPE must be a scope nested inside current scope. */
26001 else
26003 }
26007 /* If the type is erroneous, skip the entire body of the class. */
26009 else
26010 /* Parse the member-specification. */
26013 /* Look for the trailing `}'. */
26015 /* Look for trailing attributes to apply to this class. */
26023 /* We've finished a type definition. Check for the common syntax
26024 error of forgetting a semicolon after the definition. We need to
26025 be careful, as we can't just check for not-a-semicolon and be done
26026 with it; the user might have typed:
26028 class X { } c = ...;
26029 class X { } *p = ...;
26031 and so forth. Instead, enumerate all the possible tokens that
26032 might follow this production; if we don't see one of them, then
26033 complain and silently insert the semicolon. */
26034 {
26039 /* Don't try to parse c++11 attributes here. As per the
26040 grammar, that should be a task for
26041 cp_parser_decl_specifier_seq. */
26045 {
26057 /* While it's legal for type qualifiers and storage class
26058 specifiers to follow type definitions in the grammar, only
26059 compiler testsuites contain code like that. Assume that if
26060 we see such code, then what we're really seeing is a case
26061 like:
26063 class X { }
26064 const <type> var = ...;
26066 or
26068 class Y { }
26069 static <type> func (...) ...
26071 i.e. the qualifier or specifier applies to the next
26072 declaration. To do so, however, we need to look ahead one
26073 more token to see if *that* token is a type specifier.
26075 This code could be improved to handle:
26077 class Z { }
26078 static const <type> var = ...; */
26081 {
26084 /* Handling user-defined types here would be nice, but very
26085 tricky. */
26086 want_semicolon
26089 }
26093 }
26095 /* If we don't have a type, then something is very wrong and we
26096 shouldn't try to do anything clever. Likewise for not seeing the
26097 closing brace. */
26099 {
26100 /* Locate the closing brace. */
26101 cp_token_position prev
26106 /* We want to suggest insertion of a ';' immediately *after* the
26107 closing brace, so, if we can, offset the location by 1 column. */
26114 /* If we successfully offset the location, suggest the fix-it. */
26127 else
26130 /* Unget one token and smash it to look as though we encountered
26131 a semicolon in the input stream. */
26136 }
26137 }
26139 /* If this class is not itself within the scope of another class,
26140 then we need to parse the bodies of all of the queued function
26141 definitions. Note that the queued functions defined in a class
26142 are not always processed immediately following the
26143 class-specifier for that class. Consider:
26145 struct A {
26146 struct B { void f() { sizeof (A); } };
26147 };
26149 If `f' were processed before the processing of `A' were
26150 completed, there would be no way to compute the size of `A'.
26151 Note that the nesting we are interested in here is lexical --
26152 not the semantic nesting given by TYPE_CONTEXT. In particular,
26153 for:
26155 struct A { struct B; };
26156 struct A::B { void f() { } };
26158 there is no need to delay the parsing of `A::B::f'. */
26160 {
26161 tree decl;
26168 {
26169 /* Skip default arguments, NSDMIs, etc, in order to improve
26170 error recovery (c++/71169, c++/71832). */
26174 }
26176 /* In a first pass, parse default arguments to the functions.
26177 Then, in a second pass, parse the bodies of the functions.
26178 This two-phased approach handles cases like:
26180 struct S {
26181 void f() { g(); }
26182 void g(int i = 3);
26183 };
26185 */
26187 {
26189 /* If there are default arguments that have not yet been processed,
26190 take care of them now. */
26192 {
26197 }
26198 /* Make sure that any template parameters are in scope. */
26200 /* Parse the default argument expressions. */
26202 /* Remove any template parameters from the symbol table. */
26204 }
26207 /* If there are noexcept-specifiers that have not yet been processed,
26208 take care of them now. Do this before processing NSDMIs as they
26209 may depend on noexcept-specifiers already having been processed. */
26213 {
26216 {
26221 }
26226 /* Make sure that any template parameters are in scope. */
26229 /* Make sure that any member-function parameters are in scope.
26230 This function doesn't expect ccp to be set. */
26234 /* 'this' is not allowed in static member functions. */
26235 unsigned char local_variables_forbidden_p
26240 /* Now we can parse the noexcept-specifier. */
26246 /* Update the fn's type directly -- it might have escaped
26247 beyond this decl :( */
26249 /* Update any instantiations we've already created. We must
26250 keep the new noexcept-specifier wrapped in a DEFERRED_NOEXCEPT
26251 so that maybe_instantiate_noexcept can tsubst the NOEXCEPT_EXPR
26252 in the pattern. */
26257 /* Restore the state of local_variables_forbidden_p. */
26260 /* The finish_struct call above performed various override checking,
26261 but it skipped unparsed noexcept-specifier operands. Now that we
26262 have resolved them, check again. */
26265 /* Remove any member-function parameters from the symbol table. */
26268 /* Remove any template parameters from the symbol table. */
26270 }
26273 /* Now parse any NSDMIs. */
26275 {
26277 {
26282 }
26285 }
26292 /* Now parse the body of the functions. */
26294 {
26295 /* OpenMP UDRs need to be parsed before all other functions. */
26302 }
26303 else
26307 }
26309 /* Put back any saved access checks. */
26312 /* Restore saved state. */
26316 parser->num_template_parameter_lists
26318 parser->in_unbraced_linkage_specification_p
26322 }
26324 static tree
26326 {
26327 tree ret;
26332 }
26334 /* Parse a class-head.
26336 class-head:
26337 class-key identifier [opt] base-clause [opt]
26338 class-key nested-name-specifier identifier class-virt-specifier [opt] base-clause [opt]
26339 class-key nested-name-specifier [opt] template-id
26340 base-clause [opt]
26342 class-virt-specifier:
26343 final
26345 GNU Extensions:
26346 class-key attributes identifier [opt] base-clause [opt]
26347 class-key attributes nested-name-specifier identifier base-clause [opt]
26348 class-key attributes nested-name-specifier [opt] template-id
26349 base-clause [opt]
26351 Upon return BASES is initialized to the list of base classes (or
26352 NULL, if there are none) in the same form returned by
26353 cp_parser_base_clause.
26355 Returns the TYPE of the indicated class. Sets
26356 *NESTED_NAME_SPECIFIER_P to TRUE iff one of the productions
26357 involving a nested-name-specifier was used, and FALSE otherwise.
26359 Returns error_mark_node if this is not a class-head.
26361 Returns NULL_TREE if the class-head is syntactically valid, but
26362 semantically invalid in a way that means we should skip the entire
26363 body of the class. */
26365 static tree
26368 {
26369 tree nested_name_specifier;
26373 tree attributes;
26374 tree bases;
26384 /* Assume no nested-name-specifier will be present. */
26386 /* Assume no template parameter lists will be used in defining the
26387 type. */
26391 /* Look for the class-key. */
26398 /* Parse the attributes. */
26401 /* If the next token is `::', that is invalid -- but sometimes
26402 people do try to write:
26404 struct ::S {};
26406 Handle this gracefully by accepting the extra qualifier, and then
26407 issuing an error about it later if this really is a
26408 class-head. If it turns out just to be an elaborated type
26409 specifier, remain silent. */
26415 /* Determine the name of the class. Begin by looking for an
26416 optional nested-name-specifier. */
26418 nested_name_specifier
26424 /* If there was a nested-name-specifier, then there *must* be an
26425 identifier. */
26430 {
26432 /* Although the grammar says `identifier', it really means
26433 `class-name' or `template-name'. You are only allowed to
26434 define a class that has already been declared with this
26435 syntax.
26437 The proposed resolution for Core Issue 180 says that wherever
26438 you see `class T::X' you should treat `X' as a type-name.
26440 It is OK to define an inaccessible class; for example:
26442 class A { class B; };
26443 class A::B {};
26445 We do not know if we will see a class-name, or a
26446 template-name. We look for a class-name first, in case the
26447 class-name is a template-id; if we looked for the
26448 template-name first we would stop after the template-name. */
26455 class_type,
26459 /* If that didn't work, ignore the nested-name-specifier. */
26461 {
26467 }
26468 /* If we could not find a corresponding TYPE, treat this
26469 declaration like an unqualified declaration. */
26472 /* Otherwise, count the number of templates used in TYPE and its
26473 containing scopes. */
26474 else
26476 }
26477 /* Otherwise, the identifier is optional. */
26478 else
26479 {
26480 /* We don't know whether what comes next is a template-id,
26481 an identifier, or nothing at all. */
26483 /* Check for a template-id. */
26488 class_key,
26490 /* If that didn't work, it could still be an identifier. */
26492 {
26494 {
26497 }
26498 else
26500 }
26501 else
26502 {
26505 }
26506 }
26511 {
26513 class_key,
26515 }
26518 /* If it's not a `:' or a `{' then we can't really be looking at a
26519 class-head, since a class-head only appears as part of a
26520 class-specifier. We have to detect this situation before calling
26521 xref_tag, since that has irreversible side-effects. */
26523 {
26527 }
26529 /* At this point, we're going ahead with the class-specifier, even
26530 if some other problem occurs. */
26533 {
26538 }
26539 /* Issue the error about the overly-qualified name now. */
26541 {
26546 }
26548 {
26553 }
26555 {
26556 tree scope;
26559 /* [temp.names]: in a qualified-id formed by a class-head-name, the
26560 keyword template shall not appear at the top level. */
26564 /* Reject typedef-names in class heads. */
26566 {
26569 type);
26572 }
26574 /* Figure out in what scope the declaration is being placed. */
26576 /* If that scope does not contain the scope in which the
26577 class was originally declared, the program is invalid. */
26579 {
26582 "declaration of %qD in namespace %qD which does not "
26585 else
26591 }
26592 /* [dcl.meaning]
26594 A declarator-id shall not be qualified except for the
26595 definition of a ... nested class outside of its class
26596 ... [or] the definition or explicit instantiation of a
26597 class member of a namespace outside of its namespace. */
26601 }
26602 /* An explicit-specialization must be preceded by "template <>". If
26603 it is not, try to recover gracefully. */
26606 && !processing_template_parmlist
26608 {
26609 /* Build a location of this form:
26610 struct typename <ARGS>
26611 ^~~~~~~~~~~~~~~~~~~~~~
26612 with caret==start at the start token, and
26613 finishing at the end of the type. */
26614 location_t reported_loc
26616 class_head_start_location,
26622 "an explicit specialization must be preceded by"
26625 /* Take the same action that would have been taken by
26626 cp_parser_explicit_specialization. */
26629 }
26630 /* There must be no "return" statements between this point and the
26631 end of this function; set "type "to the correct return value and
26632 use "goto done;" to return. */
26633 /* Make sure that the right number of template parameters were
26634 present. */
26636 template_id_p,
26639 {
26640 /* If something went wrong, there is no point in even trying to
26641 process the class-definition. */
26644 }
26646 /* Look up the type. */
26648 {
26652 {
26656 }
26657 else
26658 {
26662 /* Check the scope while we still know whether or not we had a
26663 nested-name-specifier. */
26666 }
26669 }
26671 {
26674 /* Given:
26676 template <typename T> struct S { struct T };
26677 template <typename T> struct S<T>::T { };
26679 we will get a TYPENAME_TYPE when processing the definition of
26680 `S::T'. We need to resolve it to the actual type before we
26681 try to define it. */
26683 {
26686 {
26689 }
26690 }
26694 {
26697 }
26699 /* Enter the scope indicated by the nested-name-specifier. */
26701 /* Get the canonical version of this type. */
26703 /* Call push_template_decl if it seems like we should be defining a
26704 template either from the template headers or the type we're
26705 defining, so that we diagnose both extra and missing headers. */
26709 {
26712 {
26715 }
26716 }
26720 }
26722 {
26723 /* If the class was unnamed, create a dummy name. */
26731 }
26733 /* Diagnose class/struct/union mismatches. */
26737 /* Indicate whether this class was declared as a `class' or as a
26738 `struct'. */
26742 /* If this type was already complete, and we see another definition,
26743 that's an error. Likewise if the type is already being defined:
26744 this can happen, eg, when it's defined from within an expression
26745 (c++/84605). */
26748 {
26750 type);
26752 type);
26755 }
26760 {
26763 {
26764 /* In a lambda this should work, but doesn't currently. */
26767 }
26769 /* Apply attributes now, before any use of the class as a template
26770 argument in its base list. */
26773 }
26775 /* Associate constraints with the type. */
26779 /* We will have entered the scope containing the class; the names of
26780 base classes should be looked up in that context. For example:
26782 struct A { struct B {}; struct C; };
26783 struct A::C : B {};
26785 is valid. */
26787 /* Get the list of base-classes, if there is one. Defer access checking
26788 until the entire list has been seen, as per [class.access.general]. */
26791 {
26797 }
26798 else
26801 /* If we're really defining a class, process the base classes.
26802 If they're invalid, fail. */
26806 /* Now that all bases have been seen and attached to the class, check
26807 accessibility of the types named in the base-clause. This must be
26808 done relative to the class scope, so that we accept e.g.
26810 struct A { protected: struct B {}; };
26811 struct C : A::B, A {}; // OK: A::B is accessible via base A
26813 as per [class.access.general]. */
26820 done:
26821 /* Leave the scope given by the nested-name-specifier. We will
26822 enter the class scope itself while processing the members. */
26827 {
26830 }
26836 out:
26839 }
26841 /* Parse a class-key.
26843 class-key:
26844 class
26845 struct
26846 union
26848 Returns the kind of class-key specified, or none_type to indicate
26849 error. */
26851 static enum tag_types
26853 {
26857 /* Look for the class-key. */
26862 /* Check to see if the TOKEN is a class-key. */
26867 }
26869 /* Parse a type-parameter-key.
26871 type-parameter-key:
26872 class
26873 typename
26874 */
26876 static void
26878 {
26879 /* Look for the type-parameter-key. */
26883 {
26887 /* typename is not allowed in a template template parameter
26888 by the standard until C++17. */
26890 "ISO C++ forbids typename key in template template parameter;"
26892 }
26893 else
26897 }
26899 /* Parse an (optional) member-specification.
26901 member-specification:
26902 member-declaration member-specification [opt]
26903 access-specifier : member-specification [opt] */
26905 static void
26907 {
26909 {
26913 /* Peek at the next token. */
26915 /* If it's a `}', or EOF then we've seen all the members. */
26921 /* See if this token is a keyword. */
26924 {
26928 /* Consume the access-specifier. */
26930 /* Remember which access-specifier is active. */
26932 /* Look for the `:'. */
26937 /* Accept #pragmas at class scope. */
26939 {
26942 }
26944 /* Otherwise, the next construction must be a
26945 member-declaration. */
26947 }
26948 }
26949 }
26951 /* Parse a member-declaration.
26953 member-declaration:
26954 decl-specifier-seq [opt] member-declarator-list [opt] ;
26955 function-definition ; [opt]
26956 :: [opt] nested-name-specifier template [opt] unqualified-id ;
26957 using-declaration
26958 template-declaration
26959 alias-declaration
26961 member-declarator-list:
26962 member-declarator
26963 member-declarator-list , member-declarator
26965 member-declarator:
26966 declarator pure-specifier [opt]
26967 declarator constant-initializer [opt]
26968 identifier [opt] : constant-expression
26970 GNU Extensions:
26972 member-declaration:
26973 __extension__ member-declaration
26975 member-declarator:
26976 declarator attributes [opt] pure-specifier [opt]
26977 declarator attributes [opt] constant-initializer [opt]
26978 identifier [opt] attributes [opt] : constant-expression
26980 C++0x Extensions:
26982 member-declaration:
26983 static_assert-declaration */
26985 static void
26987 {
26988 cp_decl_specifier_seq decl_specifiers;
26989 tree prefix_attributes;
26990 tree decl;
26999 /* Check for the `__extension__' keyword. */
27001 {
27002 /* Recurse. */
27004 /* Restore the old value of the PEDANTIC flag. */
27008 }
27010 /* Check for a template-declaration. */
27012 {
27013 /* An explicit specialization here is an error condition, and we
27014 expect the specialization handler to detect and report this. */
27018 else
27022 }
27023 /* Check for a template introduction. */
27027 /* Check for a using-declaration. */
27029 {
27031 /* Parse the using-declaration. */
27035 else
27036 {
27037 tree decl;
27041 /* Note that if we actually see the '=' token after the
27042 identifier, cp_parser_alias_declaration commits the
27043 tentative parse. In that case, we really expect an
27044 alias-declaration. Otherwise, we expect a using
27045 declaration. */
27046 alias_decl_expected =
27052 else
27055 }
27057 }
27059 /* Check for @defs. */
27061 {
27066 {
27071 }
27073 }
27075 /* If the next token is `static_assert' we have a static assertion. */
27077 {
27080 }
27084 cp_omp_declare_simd_data odsd;
27088 /* Parse the decl-specifier-seq. */
27091 (CP_PARSER_FLAGS_OPTIONAL
27101 /* Check for an invalid type-name. */
27105 /* If there is no declarator, then the decl-specifier-seq should
27106 specify a type. */
27108 {
27109 /* If there was no decl-specifier-seq, and the next token is a
27110 `;', then we have something like:
27112 struct S { ; };
27114 [class.mem]
27116 Each member-declaration shall declare at least one member
27117 name of the class. */
27119 {
27122 {
27126 }
27127 }
27128 else
27129 {
27130 /* See if this declaration is a friend. */
27132 /* If there were decl-specifiers, check to see if there was
27133 a class-declaration. */
27136 /* Nested classes have already been added to the class, but
27137 a `friend' needs to be explicitly registered. */
27139 {
27140 /* If the `friend' keyword was present, the friend must
27141 be introduced with a class-key. */
27144 "in C++03 a class-key must be used "
27146 /* In this case:
27148 template <typename T> struct A {
27149 friend struct A<T>::B;
27150 };
27152 A<T>::B will be represented by a TYPENAME_TYPE, and
27153 therefore not recognized by check_tag_decl. */
27155 {
27159 }
27160 /* Warn if an attribute cannot appear here, as per
27161 [dcl.attr.grammar]/5. But not when declares_class_or_enum:
27162 we ignore attributes in elaborated-type-specifiers. */
27165 {
27170 "that appertains to a friend declaration that "
27172 }
27175 "friend declaration does not name a class or "
27177 else
27180 }
27181 /* If there is no TYPE, an error message will already have
27182 been issued. */
27184 ;
27185 /* An anonymous aggregate has to be handled specially; such
27186 a declaration really declares a data member (with a
27187 particular type), as opposed to a nested class. */
27189 {
27190 /* C++11 9.5/6. */
27193 "a storage class on an anonymous aggregate "
27196 /* Remove constructors and such from TYPE, now that we
27197 know it is an anonymous aggregate. */
27199 /* And make the corresponding data member. */
27202 /* Add it to the class. */
27204 }
27205 else
27206 cp_parser_check_access_in_redeclaration
27209 }
27210 }
27211 else
27212 {
27215 /* Clear attributes from the decl_specifiers but keep them
27216 around as prefix attributes that apply them to the entity
27217 being declared. */
27225 /* See if these declarations will be friends. */
27228 /* Keep going until we hit the `;' at the end of the
27229 declaration. */
27231 {
27233 tree first_attribute;
27234 tree initializer;
27237 /* Peek at the next token. */
27240 /* The following code wants to know early if it is a bit-field
27241 or some other declaration. Attributes can appear before
27242 the `:' token. Skip over them without consuming any tokens
27243 to peek if they are followed by `:'. */
27248 {
27249 size_t n
27252 }
27254 /* Check for a bitfield declaration. */
27260 {
27261 tree identifier;
27262 tree width;
27264 location_t id_location
27269 else
27272 /* Look for attributes that apply to the bitfield. */
27275 /* Consume the `:' token. */
27278 /* Get the width of the bitfield. */
27282 /* In C++20 and as extension for C++11 and above we allow
27283 default member initializers for bit-fields. */
27288 CPP_OPEN_BRACE)))
27289 {
27290 location_t loc
27295 "default member initializers for bit-fields "
27296 "only available with %<-std=c++20%> or "
27301 {
27305 }
27306 }
27307 else
27308 {
27309 /* Look for attributes that apply to the bitfield after
27310 the `:' token and width. This is where GCC used to
27311 parse attributes in the past, pedwarn if there is
27312 a std attribute. */
27315 "ISO C++ allows bit-field attributes only "
27319 }
27323 /* Remember which attributes are prefix attributes and
27324 which are not. */
27326 /* Combine the attributes. */
27329 /* Create the bitfield declaration. */
27332 identifier,
27333 sfk_none,
27334 id_location)
27338 attributes);
27339 }
27340 else
27341 {
27343 tree asm_specification;
27347 /* We can't delay parsing for friends,
27348 alias-declarations, and typedefs, even though the
27349 standard seems to require it. */
27354 /* Parse the declarator. */
27355 declarator
27357 flags,
27363 /* If something went wrong parsing the declarator, make sure
27364 that we at least consume some tokens. */
27366 {
27367 /* Skip to the end of the statement. */
27369 /* If the next token is not a semicolon, that is
27370 probably because we just skipped over the body of
27371 a function. So, we consume a semicolon if
27372 present, but do not issue an error message if it
27373 is not present. */
27375 CPP_SEMICOLON))
27378 }
27380 /* Handle class-scope non-template C++17 deduction guides. */
27383 declarator,
27387 cp_parser_check_for_definition_in_return_type
27391 /* Look for an asm-specification. */
27393 /* Look for attributes that apply to the declaration. */
27395 /* Remember which attributes are prefix attributes and
27396 which are not. */
27398 /* Combine the attributes. */
27401 /* If it's an `=', then we have a constant-initializer or a
27402 pure-specifier. It is not correct to parse the
27403 initializer before registering the member declaration
27404 since the member declaration should be in scope while
27405 its initializer is processed. However, the rest of the
27406 front end does not yet provide an interface that allows
27407 us to handle this correctly. */
27409 {
27410 /* In [class.mem]:
27412 A pure-specifier shall be used only in the declaration of
27413 a virtual function.
27415 A member-declarator can contain a constant-initializer
27416 only if it declares a static member of integral or
27417 enumeration type.
27419 Therefore, if the DECLARATOR is for a function, we look
27420 for a pure-specifier; otherwise, we look for a
27421 constant-initializer. When we call `grokfield', it will
27422 perform more stringent semantics checks. */
27435 {
27437 /* Don't require a constant rvalue in C++11, since we
27438 might want a reference constant. We'll enforce
27439 constancy later. */
27441 /* Parse the initializer. */
27444 }
27445 else
27446 /* Parse the initializer. */
27448 }
27451 {
27453 declarator->init_loc
27457 else
27459 }
27460 /* Detect invalid bit-field cases such as
27462 int *p : 4;
27463 int &&r : 3;
27465 and similar. */
27467 /* If there were no type specifiers, it was a
27468 constructor. */
27470 {
27471 /* This is called for a decent diagnostic only. */
27480 /* Avoid "extra ;" pedwarns. */
27482 CPP_SEMICOLON))
27485 }
27486 /* Otherwise, there is no initializer. */
27487 else
27490 /* See if we are probably looking at a function
27491 definition. We are certainly not looking at a
27492 member-declarator. Calling `grokfield' has
27493 side-effects, so we must not do it unless we are sure
27494 that we are looking at a member-declarator. */
27497 {
27498 /* The grammar does not allow a pure-specifier to be
27499 used when a member function is defined. (It is
27500 possible that this fact is an oversight in the
27501 standard, since a pure function may be defined
27502 outside of the class-specifier. */
27508 declarator,
27509 attributes);
27512 /* If the member was not a friend, declare it here. */
27515 /* Peek at the next token. */
27517 /* If the next token is a semicolon, consume it. */
27519 {
27520 location_t semicolon_loc
27525 "extra %<;%> after in-class "
27527 }
27529 }
27530 else
27533 /* Create the declaration. */
27538 {
27541 else
27543 }
27544 }
27549 /* Reset PREFIX_ATTRIBUTES. */
27551 {
27556 }
27558 /* If there is any qualification still in effect, clear it
27559 now; we will be starting fresh with the next declarator. */
27563 /* If it's a `,', then there are more declarators. */
27565 {
27568 {
27574 }
27575 }
27576 /* If the next token isn't a `;', then we have a parse error. */
27578 CPP_SEMICOLON))
27579 {
27580 /* The next token might be a ways away from where the
27581 actual semicolon is missing. Find the previous token
27582 and use that for our error position. */
27589 /* Assume that the user meant to provide a semicolon. If
27590 we were to cp_parser_skip_to_end_of_statement, we might
27591 skip to a semicolon inside a member function definition
27592 and issue nonsensical error messages. */
27594 }
27597 {
27598 /* Add DECL to the list of members. */
27600 /* Explicitly include, eg, NSDMIs, for better error
27601 recovery (c++/58650). */
27609 /* Add DECL to the queue of NSDMI to be parsed later. */
27611 }
27615 }
27616 }
27619 out:
27622 }
27624 /* Parse a pure-specifier.
27626 pure-specifier:
27627 = 0
27629 Returns INTEGER_ZERO_NODE if a pure specifier is found.
27630 Otherwise, ERROR_MARK_NODE is returned. */
27632 static tree
27634 {
27637 /* Look for the `=' token. */
27640 /* Look for the `0' token. */
27649 /* Accept = default or = delete in c++0x mode. */
27652 {
27655 }
27657 /* c_lex_with_flags marks a single digit '0' with PURE_ZERO. */
27659 {
27664 }
27666 {
27669 }
27672 }
27674 /* Parse a constant-initializer.
27676 constant-initializer:
27677 = constant-expression
27679 Returns a representation of the constant-expression. */
27681 static tree
27683 {
27684 /* Look for the `=' token. */
27688 /* It is invalid to write:
27690 struct S { static const int i = { 7 }; };
27692 */
27694 {
27697 /* Consume the opening brace. */
27698 matching_braces braces;
27700 /* Skip the initializer. */
27702 /* Look for the trailing `}'. */
27706 }
27709 }
27711 /* Derived classes [gram.class.derived] */
27713 /* Parse a base-clause.
27715 base-clause:
27716 : base-specifier-list
27718 base-specifier-list:
27719 base-specifier ... [opt]
27720 base-specifier-list , base-specifier ... [opt]
27722 Returns a TREE_LIST representing the base-classes, in the order in
27723 which they were declared. The representation of each node is as
27724 described by cp_parser_base_specifier.
27726 In the case that no bases are specified, this function will return
27727 NULL_TREE, not ERROR_MARK_NODE. */
27729 static tree
27731 {
27734 /* Look for the `:' that begins the list. */
27737 /* Scan the base-specifier-list. */
27739 {
27741 tree base;
27744 /* Look for the base-specifier. */
27746 /* Look for the (optional) ellipsis. */
27748 {
27749 /* Consume the `...'. */
27753 }
27755 /* Add BASE to the front of the list. */
27757 {
27759 /* Make this a pack expansion type. */
27763 {
27766 }
27767 }
27768 /* Peek at the next token. */
27770 /* If it's not a comma, then the list is complete. */
27773 /* Consume the `,'. */
27775 }
27777 /* PARSER->SCOPE may still be non-NULL at this point, if the last
27778 base class had a qualified name. However, the next name that
27779 appears is certainly not qualified. */
27785 }
27787 /* Parse a base-specifier.
27789 base-specifier:
27790 :: [opt] nested-name-specifier [opt] class-name
27791 virtual access-specifier [opt] :: [opt] nested-name-specifier
27792 [opt] class-name
27793 access-specifier virtual [opt] :: [opt] nested-name-specifier
27794 [opt] class-name
27796 Returns a TREE_LIST. The TREE_PURPOSE will be one of
27797 ACCESS_{DEFAULT,PUBLIC,PROTECTED,PRIVATE}_[VIRTUAL]_NODE to
27798 indicate the specifiers provided. The TREE_VALUE will be a TYPE
27799 (or the ERROR_MARK_NODE) indicating the type that was specified. */
27801 static tree
27803 {
27811 tree type;
27813 /* Process the optional `virtual' and `access-specifier'. */
27815 {
27816 /* Peek at the next token. */
27818 /* Process `virtual'. */
27820 {
27822 /* If `virtual' appears more than once, issue an error. */
27824 {
27828 }
27832 /* Consume the `virtual' token. */
27840 /* If more than one access specifier appears, issue an
27841 error. */
27844 {
27848 }
27852 /* Consume the access-specifier. */
27860 }
27861 }
27862 /* It is not uncommon to see programs mechanically, erroneously, use
27863 the 'typename' keyword to denote (dependent) qualified types
27864 as base classes. */
27866 {
27871 else
27873 "keyword %<typename%> not allowed in this context "
27876 }
27878 /* Look for the optional `::' operator. */
27880 /* Look for the nested-name-specifier. The simplest way to
27881 implement:
27883 [temp.res]
27885 The keyword `typename' is not permitted in a base-specifier or
27886 mem-initializer; in these contexts a qualified name that
27887 depends on a template-parameter is implicitly assumed to be a
27888 type name.
27890 is to pretend that we have seen the `typename' keyword at this
27891 point. */
27897 /* If the base class is given by a qualified name, assume that names
27898 we see are type names or templates, as appropriate. */
27904 /* DR 950 allows decltype as a base-specifier. */
27906 else
27907 {
27908 /* Otherwise, look for the class-name. */
27910 class_scope_p,
27911 template_p,
27912 typename_type,
27917 }
27923 }
27925 /* Exception handling [gram.exception] */
27927 /* Save the tokens that make up the noexcept-specifier for a member-function.
27928 Returns a DEFERRED_PARSE. */
27930 static tree
27932 {
27934 /* We want everything up to, including, the final ')'. */
27938 /* As with default arguments and NSDMIs, make use of DEFERRED_PARSE
27939 to carry the information we will need. */
27941 /* Save away the noexcept-specifier; we will process it when the
27942 class is complete. */
27947 }
27949 /* Used for late processing of noexcept-specifiers of member-functions.
27950 DEFAULT_ARG is the unparsed operand of a noexcept-specifier which
27951 we saved for later; parse it now. DECL is the declaration of the
27952 member function. */
27954 static tree
27956 {
27957 /* Make sure we've gotten something that hasn't been parsed yet. */
27962 /* Push the saved tokens for the noexcept-specifier onto the parser's
27963 lexer stack. */
27967 /* Parse the cached noexcept-specifier. */
27968 tree parsed_arg
27970 CP_PARSER_FLAGS_NONE,
27975 /* Revert to the main lexer. */
27978 /* Restore the queue. */
27981 /* And we're done. */
27983 }
27985 /* Perform late checking of overriding function with respect to their
27986 noexcept-specifiers. TYPE is the class and FNDECL is the function
27987 that potentially overrides some virtual function with the same
27988 signature. */
27990 static void
27992 {
27994 tree base_binfo;
28000 {
28009 }
28010 }
28012 /* Parse an (optional) noexcept-specification.
28014 noexcept-specification:
28015 noexcept ( constant-expression ) [opt]
28017 If no noexcept-specification is present, returns NULL_TREE.
28018 Otherwise, if REQUIRE_CONSTEXPR is false, then either parse and return any
28019 expression if parentheses follow noexcept, or return BOOLEAN_TRUE_NODE if
28020 there are no parentheses. CONSUMED_EXPR will be set accordingly.
28021 Otherwise, returns a noexcept specification unless RETURN_COND is true,
28022 in which case a boolean condition is returned instead. The parser flags
28023 FLAGS is used to control parsing. QUALS are qualifiers indicating whether
28024 the (member) function is `const'. */
28026 static tree
28028 cp_parser_flags flags,
28032 {
28036 /* Peek at the next token. */
28039 /* Is it a noexcept-specification? */
28041 {
28042 tree expr;
28044 /* [class.mem]/6 says that a noexcept-specifer (within the
28045 member-specification of the class) is a complete-class context of
28046 a class. So, if the noexcept-specifier has the optional expression,
28047 just save the tokens, and reparse this after we're done with the
28048 class. */
28052 /* No need to delay parsing for a number literal or true/false. */
28064 {
28065 matching_parens parens;
28069 {
28070 /* Types may not be defined in an exception-specification. */
28072 parser->type_definition_forbidden_message
28076 expr
28082 {
28085 }
28087 /* Restore the saved message. */
28089 }
28090 else
28091 {
28094 }
28097 }
28098 else
28099 {
28103 }
28105 /* We cannot build a noexcept-spec right away because this will check
28106 that expr is a constexpr. */
28109 else
28111 }
28112 else
28114 }
28116 /* Parse an (optional) exception-specification.
28118 exception-specification:
28119 throw ( type-id-list [opt] )
28121 Returns a TREE_LIST representing the exception-specification. The
28122 TREE_VALUE of each node is a type. The parser flags FLAGS is used to
28123 control parsing. QUALS are qualifiers indicating whether the (member)
28124 function is `const'. */
28126 static tree
28128 cp_parser_flags flags)
28129 {
28131 tree type_id_list;
28134 /* Peek at the next token. */
28137 /* Is it a noexcept-specification? */
28138 type_id_list
28146 /* If it's not `throw', then there's no exception-specification. */
28152 /* Consume the `throw'. */
28155 /* Look for the `('. */
28156 matching_parens parens;
28159 /* Peek at the next token. */
28161 /* If it's not a `)', then there is a type-id-list. */
28163 {
28164 /* Types may not be defined in an exception-specification. */
28166 parser->type_definition_forbidden_message
28168 /* Parse the type-id-list. */
28170 /* Restore the saved message. */
28174 {
28178 }
28181 "dynamic exception specifications are deprecated in "
28183 }
28184 /* In C++17, throw() is equivalent to noexcept (true). throw()
28185 is deprecated in C++11 and above as well, but is still widely used,
28186 so don't warn about it yet. */
28189 else
28192 /* Look for the `)'. */
28196 }
28198 /* Parse an (optional) type-id-list.
28200 type-id-list:
28201 type-id ... [opt]
28202 type-id-list , type-id ... [opt]
28204 Returns a TREE_LIST. The TREE_VALUE of each node is a TYPE,
28205 in the order that the types were presented. */
28207 static tree
28209 {
28213 {
28215 tree type;
28219 /* Get the next type-id. */
28221 /* Check for invalid 'auto'. */
28223 {
28227 }
28228 /* Parse the optional ellipsis. */
28230 {
28231 /* Consume the `...'. */
28234 /* Turn the type into a pack expansion expression. */
28236 }
28237 /* Add it to the list. */
28239 /* Peek at the next token. */
28241 /* If it is not a `,', we are done. */
28244 /* Consume the `,'. */
28246 }
28249 }
28251 /* Parse a try-block.
28253 try-block:
28254 try compound-statement handler-seq */
28256 static tree
28258 {
28259 tree try_block;
28266 "%<try%> in %<constexpr%> function only "
28276 }
28278 /* Parse a function-try-block.
28280 function-try-block:
28281 try ctor-initializer [opt] function-body handler-seq */
28283 static void
28285 {
28286 tree compound_stmt;
28287 tree try_block;
28289 /* Look for the `try' keyword. */
28292 /* Let the rest of the front end know where we are. */
28294 /* Parse the function-body. */
28295 cp_parser_ctor_initializer_opt_and_function_body
28297 /* We're done with the `try' part. */
28299 /* Parse the handlers. */
28301 /* We're done with the handlers. */
28303 }
28305 /* Parse a handler-seq.
28307 handler-seq:
28308 handler handler-seq [opt] */
28310 static void
28312 {
28314 {
28317 /* Parse the handler. */
28319 /* Peek at the next token. */
28321 /* If it's not `catch' then there are no more handlers. */
28324 }
28325 }
28327 /* Parse a handler.
28329 handler:
28330 catch ( exception-declaration ) compound-statement */
28332 static void
28334 {
28335 tree handler;
28336 tree declaration;
28340 matching_parens parens;
28347 }
28349 /* Parse an exception-declaration.
28351 exception-declaration:
28352 type-specifier-seq declarator
28353 type-specifier-seq abstract-declarator
28354 type-specifier-seq
28355 ...
28357 Returns a VAR_DECL for the declaration, or NULL_TREE if the
28358 ellipsis variant is used. */
28360 static tree
28362 {
28363 cp_decl_specifier_seq type_specifiers;
28367 /* If it's an ellipsis, it's easy to handle. */
28369 {
28370 /* Consume the `...' token. */
28373 }
28375 /* Types may not be defined in exception-declarations. */
28377 parser->type_definition_forbidden_message
28380 /* Parse the type-specifier-seq. */
28385 /* If it's a `)', then there is no declarator. */
28388 else
28390 CP_PARSER_FLAGS_NONE,
28397 /* Restore the saved message. */
28404 }
28406 /* Parse a throw-expression.
28408 throw-expression:
28409 throw assignment-expression [opt]
28411 Returns a THROW_EXPR representing the throw-expression. */
28413 static tree
28415 {
28416 tree expression;
28422 /* Figure out whether or not there is an assignment-expression
28423 following the "throw" keyword. */
28431 else
28434 /* Construct a location e.g.:
28435 throw x
28436 ^~~~~~~
28437 with caret == start at the start of the "throw" token, and
28438 the end at the end of the final token we consumed. */
28444 }
28446 /* Parse a yield-expression.
28448 yield-expression:
28449 co_yield assignment-expression
28450 co_yield braced-init-list
28452 Returns a CO_YIELD_EXPR representing the yield-expression. */
28454 static tree
28456 {
28457 tree expr;
28465 {
28468 /* ??? : probably a moot point? */
28471 }
28472 else
28479 }
28481 /* GNU Extensions */
28483 /* Parse an (optional) asm-specification.
28485 asm-specification:
28486 asm ( string-literal )
28488 If the asm-specification is present, returns a STRING_CST
28489 corresponding to the string-literal. Otherwise, returns
28490 NULL_TREE. */
28492 static tree
28494 {
28496 tree asm_specification;
28498 /* Peek at the next token. */
28500 /* If the next token isn't the `asm' keyword, then there's no
28501 asm-specification. */
28505 /* Consume the `asm' token. */
28507 /* Look for the `('. */
28508 matching_parens parens;
28511 /* Look for the string-literal. */
28514 /* Look for the `)'. */
28518 }
28520 /* Parse an asm-operand-list.
28522 asm-operand-list:
28523 asm-operand
28524 asm-operand-list , asm-operand
28526 asm-operand:
28527 string-literal ( expression )
28528 [ string-literal ] string-literal ( expression )
28530 Returns a TREE_LIST representing the operands. The TREE_VALUE of
28531 each node is the expression. The TREE_PURPOSE is itself a
28532 TREE_LIST whose TREE_PURPOSE is a STRING_CST for the bracketed
28533 string-literal (or NULL_TREE if not present) and whose TREE_VALUE
28534 is a STRING_CST for the string literal before the parenthesis. Returns
28535 ERROR_MARK_NODE if any of the operands are invalid. */
28537 static tree
28539 {
28544 {
28545 tree string_literal;
28546 tree expression;
28547 tree name;
28550 {
28551 /* Consume the `[' token. */
28553 /* Read the operand name. */
28558 /* Look for the closing `]'. */
28560 }
28561 else
28563 /* Look for the string-literal. */
28566 /* Look for the `('. */
28567 matching_parens parens;
28569 /* Parse the expression. */
28571 /* Look for the `)'. */
28579 /* Add this operand to the list. */
28581 expression,
28582 asm_operands);
28583 /* If the next token is not a `,', there are no more
28584 operands. */
28587 /* Consume the `,'. */
28589 }
28592 }
28594 /* Parse an asm-clobber-list.
28596 asm-clobber-list:
28597 string-literal
28598 asm-clobber-list , string-literal
28600 Returns a TREE_LIST, indicating the clobbers in the order that they
28601 appeared. The TREE_VALUE of each node is a STRING_CST. */
28603 static tree
28605 {
28609 {
28610 tree string_literal;
28612 /* Look for the string literal. */
28614 /* Add it to the list. */
28616 /* If the next token is not a `,', then the list is
28617 complete. */
28620 /* Consume the `,' token. */
28622 }
28625 }
28627 /* Parse an asm-label-list.
28629 asm-label-list:
28630 identifier
28631 asm-label-list , identifier
28633 Returns a TREE_LIST, indicating the labels in the order that they
28634 appeared. The TREE_VALUE of each node is a label. */
28636 static tree
28638 {
28642 {
28645 /* Look for the identifier. */
28648 {
28651 {
28657 }
28658 }
28659 /* If the next token is not a `,', then the list is
28660 complete. */
28663 /* Consume the `,' token. */
28665 }
28668 }
28670 /* Return TRUE iff the next tokens in the stream are possibly the
28671 beginning of a GNU extension attribute. */
28673 static bool
28675 {
28677 }
28679 /* Return TRUE iff the next tokens in the stream are possibly the
28680 beginning of a standard C++-11 attribute specifier. */
28682 static bool
28684 {
28686 }
28688 /* Return TRUE iff the next Nth tokens in the stream are possibly the
28689 beginning of a standard C++-11 attribute specifier. */
28691 static bool
28693 {
28701 }
28703 /* Return TRUE iff the next Nth tokens in the stream are possibly the
28704 beginning of a GNU extension attribute. */
28706 static bool
28708 {
28712 }
28714 /* Return true iff the next tokens can be the beginning of either a
28715 GNU attribute list, or a standard C++11 attribute sequence. */
28717 static bool
28719 {
28722 }
28724 /* Return true iff the next Nth tokens can be the beginning of either
28725 a GNU attribute list, or a standard C++11 attribute sequence. */
28727 static bool
28729 {
28732 }
28734 /* Parse either a standard C++-11 attribute-specifier-seq, or a series
28735 of GNU attributes, or return NULL. */
28737 static tree
28739 {
28743 }
28745 /* Parse an (optional) series of attributes.
28747 attributes:
28748 attributes attribute
28750 attribute:
28751 __attribute__ (( attribute-list [opt] ))
28753 The return value is as for cp_parser_gnu_attribute_list. */
28755 static tree
28757 {
28764 {
28766 tree attribute_list;
28769 /* Peek at the next token. */
28771 /* If it's not `__attribute__', then we're done. */
28775 /* Consume the `__attribute__' keyword. */
28777 /* Look for the two `(' tokens. */
28778 matching_parens outer_parens;
28781 matching_parens inner_parens;
28785 /* Peek at the next token. */
28788 /* Parse the attribute-list. */
28790 else
28791 /* If the next token is a `)', then there is no attribute
28792 list. */
28795 /* Look for the two `)' tokens. */
28803 /* Add these new attributes to the list. */
28805 }
28808 }
28810 /* Parse a GNU attribute-list.
28812 attribute-list:
28813 attribute
28814 attribute-list , attribute
28816 attribute:
28817 identifier
28818 identifier ( identifier )
28819 identifier ( identifier , expression-list )
28820 identifier ( expression-list )
28822 Returns a TREE_LIST, or NULL_TREE on error. Each node corresponds
28823 to an attribute. The TREE_PURPOSE of each node is the identifier
28824 indicating which attribute is in use. The TREE_VALUE represents
28825 the arguments, if any. */
28827 static tree
28829 {
28833 /* Don't create wrapper nodes within attributes: the
28834 handlers don't know how to handle them. */
28835 auto_suppress_location_wrappers sentinel;
28839 {
28841 tree identifier;
28842 tree attribute;
28844 /* Look for the identifier. We also allow keywords here; for
28845 example `__attribute__ ((const))' is legal. */
28849 {
28852 /* Consume the token, but save it since we need it for the
28853 SIMD enabled function parsing. */
28856 /* Save away the identifier that indicates which attribute
28857 this is. */
28859 /* For keywords, use the canonical spelling, not the
28860 parsed identifier. */
28867 /* Peek at the next token. */
28869 /* If it's an `(', then parse the attribute arguments. */
28871 {
28875 vec = cp_parser_parenthesized_expression_list
28881 else
28882 {
28885 }
28886 /* Save the arguments away. */
28888 }
28891 {
28892 /* Add this attribute to the list. */
28895 }
28898 }
28899 /* Unless EXACTLY_ONE is set look for more attributes.
28900 If the next token isn't a `,', we're done. */
28904 /* Consume the comma and keep going. */
28906 }
28909 /* We built up the list in reverse order. */
28911 }
28913 /* Parse arguments of omp::directive attribute.
28915 ( directive-name ,[opt] clause-list[opt] )
28917 For directive just remember the first/last tokens for subsequent
28918 parsing. */
28920 static void
28922 {
28925 {
28931 }
28934 {
28940 }
28949 }
28951 /* Parse arguments of omp::sequence attribute.
28953 ( omp::[opt] directive-attr [ , omp::[opt] directive-attr ]... ) */
28955 static void
28957 {
28958 matching_parens parens;
28960 do
28961 {
28966 {
28970 }
28975 else
28980 {
28989 }
28993 UNKNOWN_LOCATION);
28996 else
29001 }
29006 }
29008 /* Parse a standard C++11 attribute.
29010 The returned representation is a TREE_LIST which TREE_PURPOSE is
29011 the scoped name of the attribute, and the TREE_VALUE is its
29012 arguments list.
29014 Note that the scoped name of the attribute is itself a TREE_LIST
29015 which TREE_PURPOSE is the namespace of the attribute, and
29016 TREE_VALUE its name. This is unlike a GNU attribute -- as parsed
29017 by cp_parser_gnu_attribute_list -- that doesn't have any namespace
29018 and which TREE_PURPOSE is directly the attribute name.
29020 Clients of the attribute code should use get_attribute_namespace
29021 and get_attribute_name to get the actual namespace and name of
29022 attributes, regardless of their being GNU or C++11 attributes.
29024 attribute:
29025 attribute-token attribute-argument-clause [opt]
29027 attribute-token:
29028 identifier
29029 attribute-scoped-token
29031 attribute-scoped-token:
29032 attribute-namespace :: identifier
29034 attribute-namespace:
29035 identifier
29037 attribute-argument-clause:
29038 ( balanced-token-seq )
29040 balanced-token-seq:
29041 balanced-token [opt]
29042 balanced-token-seq balanced-token
29044 balanced-token:
29045 ( balanced-token-seq )
29046 [ balanced-token-seq ]
29047 { balanced-token-seq }. */
29049 static tree
29051 {
29058 /* First, parse name of the attribute, a.k.a attribute-token. */
29075 {
29076 /* We are seeing a scoped attribute token. */
29091 else
29092 {
29096 }
29102 NULL_TREE);
29104 }
29106 {
29110 NULL_TREE);
29111 }
29112 else
29113 {
29116 NULL_TREE);
29117 /* We used to treat C++11 noreturn attribute as equivalent to GNU's,
29118 but no longer: we have to be able to tell [[noreturn]] and
29119 __attribute__((noreturn)) apart. */
29120 /* C++14 deprecated attribute is equivalent to GNU's. */
29123 /* C++17 fallthrough attribute is equivalent to GNU's. */
29126 /* Transactional Memory TS optimize_for_synchronized attribute is
29127 equivalent to GNU transaction_callable. */
29131 /* Transactional Memory attributes are GNU attributes. */
29134 }
29136 /* Now parse the optional argument clause of the attribute. */
29139 {
29144 {
29146 attr_id);
29148 }
29150 }
29152 {
29156 /* Maybe we don't expect to see any arguments for this attribute. */
29160 {
29162 attr_id);
29168 }
29172 /* A GNU attribute that takes an identifier in parameter. */
29175 /* If this is a fake attribute created to handle -Wno-attributes,
29176 we must skip parsing the arguments. */
29178 {
29180 {
29182 {
29185 }
29187 {
29193 }
29194 }
29196 /* For unknown attributes, just skip balanced tokens instead of
29197 trying to parse the arguments. */
29201 }
29203 vec = cp_parser_parenthesized_expression_list
29209 else
29210 {
29212 /* e.g. [[attr()]]. */
29215 attr_id);
29218 }
29222 else
29224 }
29227 }
29229 /* Warn if the attribute ATTRIBUTE appears more than once in the
29230 attribute-list ATTRIBUTES. This used to be enforced for certain
29231 attributes, but the restriction was removed in P2156. Note that
29232 carries_dependency ([dcl.attr.depend]) isn't implemented yet in GCC.
29233 LOC is the location of ATTRIBUTE. Returns true if ATTRIBUTE was not
29234 found in ATTRIBUTES. */
29236 static bool
29238 {
29246 {
29251 }
29253 }
29255 /* Parse a list of standard C++-11 attributes.
29257 attribute-list:
29258 attribute [opt]
29259 attribute-list , attribute[opt]
29260 attribute ...
29261 attribute-list , attribute ...
29262 */
29264 static tree
29266 {
29271 {
29277 {
29279 {
29282 }
29283 }
29286 {
29291 else
29292 {
29297 }
29299 }
29303 }
29306 }
29308 /* Parse a standard C++-11 attribute specifier.
29310 attribute-specifier:
29311 [ [ attribute-using-prefix [opt] attribute-list ] ]
29312 alignment-specifier
29314 attribute-using-prefix:
29315 using attribute-namespace :
29317 alignment-specifier:
29318 alignas ( type-id ... [opt] )
29319 alignas ( alignment-expression ... [opt] ). */
29321 static tree
29323 {
29329 {
29336 {
29347 {
29350 "attribute using prefix only available "
29356 }
29357 else
29359 }
29366 else
29367 /* Warn about parsing c++11 attribute in non-c++11 mode, only
29368 when we are sure that we have actually parsed them. */
29370 }
29371 else
29372 {
29373 tree alignas_expr;
29375 /* Look for an alignment-specifier. */
29386 matching_parens parens;
29394 {
29401 }
29406 /* Handle alignas (pack...). */
29408 {
29411 }
29413 /* Something went wrong, so don't build the attribute. */
29417 /* Missing ')' means the code cannot possibly be valid; go ahead
29418 and commit to make sure we issue a hard error. */
29426 /* Build the C++-11 representation of an 'aligned'
29427 attribute. */
29428 attributes
29431 }
29434 }
29436 /* Parse a standard C++-11 attribute-specifier-seq.
29438 attribute-specifier-seq:
29439 attribute-specifier-seq [opt] attribute-specifier
29440 */
29442 static tree
29444 {
29448 /* Don't create wrapper nodes within attributes: the
29449 handlers don't know how to handle them. */
29450 auto_suppress_location_wrappers sentinel;
29453 {
29462 else
29465 }
29468 }
29470 /* Skip a balanced-token starting at Nth token (with 1 as the next token),
29471 return index of the first token after balanced-token, or N on failure. */
29473 static size_t
29475 {
29478 do
29480 {
29484 /* FALLTHRU */
29486 /* Ran out of tokens. */
29508 }
29511 }
29513 /* Skip GNU attribute tokens starting at Nth token (with 1 as the next token),
29514 return index of the first token after the GNU attribute tokens, or N on
29515 failure. */
29517 static size_t
29519 {
29521 {
29533 }
29535 }
29537 /* Skip standard C++11 attribute tokens starting at Nth token (with 1 as the
29538 next token), return index of the first token after the standard C++11
29539 attribute tokens, or N on failure. */
29541 static size_t
29543 {
29545 {
29548 {
29555 }
29558 {
29563 }
29564 else
29566 }
29568 }
29570 /* Skip standard C++11 or GNU attribute tokens starting at Nth token (with 1
29571 as the next token), return index of the first token after the attribute
29572 tokens, or N on failure. */
29574 static size_t
29576 {
29580 }
29582 /* Parse an optional `__extension__' keyword. Returns TRUE if it is
29583 present, and FALSE otherwise. *SAVED_PEDANTIC is set to the
29584 current value of the PEDANTIC flag, regardless of whether or not
29585 the `__extension__' keyword is present. The caller is responsible
29586 for restoring the value of the PEDANTIC flag. */
29588 static bool
29590 {
29591 /* Save the old value of the PEDANTIC flag. */
29595 {
29596 /* Consume the `__extension__' token. */
29598 /* We're not being pedantic while the `__extension__' keyword is
29599 in effect. */
29603 }
29606 }
29608 /* Parse a label declaration.
29610 label-declaration:
29611 __label__ label-declarator-seq ;
29613 label-declarator-seq:
29614 identifier , label-declarator-seq
29615 identifier */
29617 static void
29619 {
29620 /* Look for the `__label__' keyword. */
29624 {
29625 tree identifier;
29627 /* Look for an identifier. */
29629 /* If we failed, stop. */
29632 /* Declare it as a label. */
29634 /* If the next token is a `;', stop. */
29637 /* Look for the `,' separating the label declarations. */
29639 }
29641 /* Look for the final `;'. */
29643 }
29645 // -------------------------------------------------------------------------- //
29646 // Concept definitions
29648 static tree
29650 {
29651 /* A concept definition is an unevaluated context. */
29652 cp_unevaluated u;
29659 {
29663 }
29666 {
29670 }
29672 processing_constraint_expression_sentinel parsing_constraint;
29677 /* Consume the trailing ';'. Diagnose the problem if it isn't there,
29678 but continue as if it were. */
29682 }
29684 // -------------------------------------------------------------------------- //
29685 // Requires Clause
29687 /* Diagnose an expression that should appear in ()'s within a requires-clause
29688 and suggest where to place those parentheses. */
29690 static void
29692 {
29694 }
29696 static void
29698 {
29703 }
29705 /* Characterizes the likely kind of expression intended by a mis-written
29706 primary constraint. */
29707 enum primary_constraint_error
29708 {
29709 pce_ok,
29710 pce_maybe_operator,
29711 pce_maybe_postfix
29712 };
29714 /* Returns true if the token(s) following a primary-expression in a
29715 constraint-logical-* expression would require parentheses. */
29717 static primary_constraint_error
29719 {
29722 {
29727 {
29728 /* An equal sign may be part of the definition of a function,
29729 and not an assignment operator, when parsing the expression
29730 for a trailing requires-clause. For example:
29732 template<typename T>
29733 struct S {
29734 S() requires C<T> = default;
29735 };
29737 Don't try to reparse this a binary operator. */
29743 }
29745 /* Arithmetic operators. */
29751 /* Bitwise operators. */
29757 /* Relational operators. */
29765 /* Pointer-to-member. */
29768 /* Assignment operators. */
29779 /* Conditional operator */
29781 /* Unenclosed binary or conditional operator. */
29785 {
29786 /* A primary constraint that precedes the parameter-list of a
29787 lambda expression is followed by an open paren.
29789 []<typename T> requires C (T a, T b) { ... }
29791 Don't try to re-parse this as a postfix expression. */
29796 }
29798 {
29799 /* A primary-constraint-expression followed by a '[[' is not a
29800 postfix expression. */
29805 }
29809 /* Unenclosed postfix operator. */
29813 /* A primary constraint that precedes the lambda-declarator of a
29814 lambda expression is followed by trailing return type.
29816 []<typename T> requires C -> void {}
29818 Don't try to re-parse this as a postfix expression in
29819 C++23 and later. In C++20 ( needs to come in between but we
29820 allow it to be omitted with pedwarn. */
29823 /* Unenclosed postfix operator. */
29825 }
29826 }
29828 /* Returns true if the next token begins a unary expression, preceded by
29829 an operator or keyword. */
29831 static bool
29833 {
29836 {
29847 {
29849 {
29865 }
29866 }
29870 }
29873 }
29875 /* Parse a primary expression within a constraint. */
29877 static cp_expr
29879 {
29880 /* If this looks like a unary expression, parse it as such, but diagnose
29881 it as ill-formed; it requires parens. */
29883 {
29887 }
29890 cp_id_kind idk;
29901 {
29902 /* The primary-expression could be part of an unenclosed non-logical
29903 compound expression. */
29905 }
29907 {
29910 }
29912 /* Retry the parse at a lower precedence. If that succeeds, diagnose the
29913 error, but return the expression as if it were valid. */
29918 else
29921 {
29924 }
29926 /* Otherwise, something has gone very wrong, and we can't generate a more
29927 meaningful diagnostic or recover. */
29930 }
29932 /* Parse a constraint-logical-and-expression.
29934 constraint-logical-and-expression:
29935 primary-expression
29936 constraint-logical-and-expression '&&' primary-expression */
29938 static cp_expr
29940 {
29943 {
29947 }
29949 }
29951 /* Parse a constraint-logical-or-expression.
29953 constraint-logical-or-expression:
29954 constraint-logical-and-expression
29955 constraint-logical-or-expression '||' constraint-logical-and-expression */
29957 static cp_expr
29959 {
29962 {
29966 }
29968 }
29970 /* Parse the expression after a requires-clause. This has a different grammar
29971 than that in the concepts TS. */
29973 static tree
29975 {
29976 processing_constraint_expression_sentinel parsing_constraint;
29983 }
29985 /* Parse a expression after a requires clause.
29987 constraint-expression:
29988 logical-or-expression
29990 The required logical-or-expression must be a constant expression. Note
29991 that we don't check that the expression is constepxr here. We defer until
29992 we analyze constraints and then, we only check atomic constraints. */
29994 static tree
29996 {
29997 processing_constraint_expression_sentinel parsing_constraint;
30006 }
30008 /* Optionally parse a requires clause:
30010 requires-clause:
30011 `requires` constraint-logical-or-expression.
30012 [ConceptsTS]
30013 `requires constraint-expression.
30015 LAMBDA_P is true when the requires-clause is parsed before the
30016 parameter-list of a lambda-declarator. */
30018 static tree
30020 {
30021 /* A requires clause is an unevaluated context. */
30022 cp_unevaluated u;
30026 {
30029 {
30031 "%<requires%> only available with "
30033 /* Parse and discard the requires-clause. */
30036 }
30038 }
30042 {
30043 /* An opening brace following the start of a requires-clause is
30044 ill-formed; the user likely forgot the second `requires' that
30045 would start a requires-expression. */
30050 /* Don't consume the `requires', so that it's reused as the start of a
30051 requires-expression. */
30052 }
30053 else
30058 else
30060 }
30062 /*---------------------------------------------------------------------------
30063 Requires expressions
30064 ---------------------------------------------------------------------------*/
30066 /* Parse a requires expression
30068 requirement-expression:
30069 'requires' requirement-parameter-list [opt] requirement-body */
30071 static tree
30073 {
30077 /* Avoid committing to outer tentative parse. */
30080 /* This is definitely a requires-expression. */
30084 {
30085 /* Local parameters are delared as variables within the scope
30086 of the expression. They are not visible past the end of
30087 the expression. Expressions within the requires-expression
30088 are unevaluated. */
30089 struct scope_sentinel
30090 {
30092 {
30096 }
30099 {
30102 }
30105 /* Parse the optional parameter list. */
30107 {
30111 }
30112 else
30115 /* Parse the requirement body. */
30121 }
30123 /* This needs to happen after pop_bindings_and_leave_scope, as it reverses
30124 the parm chain. */
30129 {
30130 /* Perform semantic processing now to diagnose any invalid types and
30131 expressions. */
30136 }
30138 }
30140 /* Parse a parameterized requirement.
30142 requirement-parameter-list:
30143 '(' parameter-declaration-clause ')' */
30145 static tree
30147 {
30148 matching_parens parens;
30152 tree parms = (cp_parser_parameter_declaration_clause
30158 /* Modify the declared parameters by removing their context
30159 so they don't refer to the enclosing scope and explicitly
30160 indicating that they are constraint variables. */
30162 {
30167 {
30170 }
30171 }
30174 }
30176 /* Parse the body of a requirement.
30178 requirement-body:
30179 '{' requirement-list '}' */
30180 static tree
30182 {
30183 matching_braces braces;
30193 }
30195 /* Parse a sequence of requirements.
30197 requirement-seq:
30198 requirement
30199 requirement-seq requirement */
30201 static tree
30203 {
30205 do
30206 {
30210 }
30214 /* If there are no valid requirements, this is not a valid expression. */
30218 /* Reverse the order of requirements so they are analyzed in order. */
30220 }
30222 /* Parse a syntactic requirement or type requirement.
30224 requirement:
30225 simple-requirement
30226 compound-requirement
30227 type-requirement
30228 nested-requirement */
30230 static tree
30232 {
30239 else
30241 }
30243 /* Parse a simple requirement.
30245 simple-requirement:
30246 expression ';' */
30248 static tree
30250 {
30261 /* Sometimes we don't get locations, so use the cached token location
30262 as a reasonable approximation. */
30267 {
30270 {
30273 }
30275 {
30279 "if a concept-id is a valid expression; add "
30281 }
30283 }
30286 }
30288 /* Parse a type requirement
30290 type-requirement
30291 nested-name-specifier [opt] required-type-name ';'
30293 required-type-name:
30294 type-name
30295 'template' [opt] simple-template-id */
30297 static tree
30299 {
30303 // Save the scope before parsing name specifiers.
30314 tree type;
30316 {
30325 }
30326 else
30346 }
30348 /* Parse a compound requirement
30350 compound-requirement:
30351 '{' expression '}' 'noexcept' [opt] trailing-return-type [opt] ';' */
30353 static tree
30355 {
30356 /* Parse an expression enclosed in '{ }'s. */
30357 matching_braces braces;
30368 {
30372 }
30374 /* If the expression was invalid, skip the remainder of the requirement. */
30376 {
30380 }
30382 /* Parse the optional noexcept. */
30385 {
30388 }
30390 /* Parse the optional trailing return type. */
30393 {
30399 /* C++20 allows either a type-id or a type-constraint. Parsing
30400 a type-id will subsume the parsing for a type-constraint but
30401 allow for more syntactic forms (e.g., const C<T>*). */
30410 /* Check that we haven't written something like 'const C<T>*'. */
30412 {
30414 {
30419 }
30420 }
30422 /* P1452R2 removed the trailing-return-type option. */
30425 }
30437 }
30439 /* Parse a nested requirement. This is the same as a requires clause.
30441 nested-requirement:
30442 requires-clause */
30444 static tree
30446 {
30458 }
30460 /* Support Functions */
30462 /* Return the appropriate prefer_type argument for lookup_name based on
30463 tag_type. */
30467 {
30469 {
30473 }
30474 }
30476 /* Looks up NAME in the current scope, as given by PARSER->SCOPE.
30477 NAME should have one of the representations used for an
30478 id-expression. If NAME is the ERROR_MARK_NODE, the ERROR_MARK_NODE
30479 is returned. If PARSER->SCOPE is a dependent type, then a
30480 SCOPE_REF is returned.
30482 If NAME is a TEMPLATE_ID_EXPR, then it will be immediately
30483 returned; the name was already resolved when the TEMPLATE_ID_EXPR
30484 was formed. Abstractly, such entities should not be passed to this
30485 function, because they do not need to be looked up, but it is
30486 simpler to check for this special case here, rather than at the
30487 call-sites.
30489 In cases not explicitly covered above, this function returns a
30490 DECL, OVERLOAD, or baselink representing the result of the lookup.
30491 If there was no entity with the indicated NAME, the ERROR_MARK_NODE
30492 is returned.
30494 If TAG_TYPE is not NONE_TYPE, it indicates an explicit type keyword
30495 (e.g., "struct") that was used. In that case bindings that do not
30496 refer to types are ignored.
30498 If IS_TEMPLATE is TRUE, bindings that do not refer to templates are
30499 ignored.
30501 If IS_NAMESPACE is TRUE, bindings that do not refer to namespaces
30502 are ignored.
30504 If CHECK_DEPENDENCY is TRUE, names are not looked up in dependent
30505 types.
30507 If AMBIGUOUS_DECLS is non-NULL, *AMBIGUOUS_DECLS is set to a
30508 TREE_LIST of candidates if name-lookup results in an ambiguity, and
30509 NULL_TREE otherwise. */
30511 static cp_expr
30518 location_t name_location)
30519 {
30520 tree decl;
30523 /* Assume that the lookup will be unambiguous. */
30527 /* Now that we have looked up the name, the OBJECT_TYPE (if any) is
30528 no longer valid. Note that if we are parsing tentatively, and
30529 the parse fails, OBJECT_TYPE will be automatically restored. */
30535 /* A template-id has already been resolved; there is no lookup to
30536 do. */
30540 {
30544 }
30546 /* A BIT_NOT_EXPR is used to represent a destructor. By this point,
30547 it should already have been checked to make sure that the name
30548 used matches the type being destroyed. */
30550 {
30551 tree type;
30553 /* Figure out to which type this destructor applies. */
30558 else
30560 /* If that's not a class type, there is no destructor. */
30564 /* In a non-static member function, check implicit this->. */
30567 tf_warning_or_error);
30576 }
30578 /* By this point, the NAME should be an ordinary identifier. If
30579 the id-expression was a qualified name, the qualifying scope is
30580 stored in PARSER->SCOPE at this point. */
30583 /* Perform the lookup. */
30585 {
30591 /* If the SCOPE is dependent, the lookup must be deferred until
30592 the template is instantiated -- unless we are explicitly
30593 looking up names in uninstantiated templates. Even then, we
30594 cannot look up the name if the scope is not a class type; it
30595 might, for example, be a template type parameter. */
30600 /* Defer lookup. */
30602 else
30603 {
30606 /* If PARSER->SCOPE is a dependent type, then it must be a
30607 class type, and we must not be checking dependencies;
30608 otherwise, we would have processed this lookup above. So
30609 that PARSER->SCOPE is not considered a dependent base by
30610 lookup_member, we must enter the scope here. */
30614 /* If the PARSER->SCOPE is a template specialization, it
30615 may be instantiated during name lookup. In that case,
30616 errors may be issued. Even if we rollback the current
30617 tentative parse, those errors are valid. */
30622 /* 3.4.3.1: In a lookup in which the constructor is an acceptable
30623 lookup result and the nested-name-specifier nominates a class C:
30624 * if the name specified after the nested-name-specifier, when
30625 looked up in C, is the injected-class-name of C (Clause 9), or
30626 * if the name specified after the nested-name-specifier is the
30627 same as the identifier or the simple-template-id's template-
30628 name in the last component of the nested-name-specifier,
30629 the name is instead considered to name the constructor of
30630 class C. [ Note: for example, the constructor is not an
30631 acceptable lookup result in an elaborated-type-specifier so
30632 the constructor would not be used in place of the
30633 injected-class-name. --end note ] Such a constructor name
30634 shall be used only in the declarator-id of a declaration that
30635 names a constructor or in a using-declaration. */
30645 }
30647 /* If the scope is a dependent type and either we deferred lookup or
30648 we did lookup but didn't find the name, rememeber the name. */
30651 {
30653 {
30654 tree type;
30656 /* The resolution to Core Issue 180 says that `struct
30657 A::B' should be considered a type-name, even if `A'
30658 is dependent. */
30663 }
30667 CPP_CLOSE_PAREN)))
30671 else
30674 is_template);
30675 }
30678 }
30680 {
30681 /* Look up the name in the scope of the OBJECT_TYPE, unless the
30682 OBJECT_TYPE is not a class. */
30684 /* If the OBJECT_TYPE is a template specialization, it may
30685 be instantiated during name lookup. In that case, errors
30686 may be issued. Even if we rollback the current tentative
30687 parse, those errors are valid. */
30689 name,
30692 tf_warning_or_error);
30693 else
30697 /* Look it up in the enclosing context. DR 141: When looking for a
30698 template-name after -> or ., only consider class templates. */
30700 /* DR 141: When looking in the
30701 current enclosing context for a
30702 template-name after -> or ., only
30703 consider class templates. */
30707 /* If we know we're looking for a type (e.g. A in p->A::x),
30708 mock up a typename. */
30711 {
30713 typename_type);
30715 }
30719 }
30720 else
30721 {
30726 }
30728 /* If the lookup failed, let our caller know. */
30732 /* If we have resolved the name of a member declaration, check to
30733 see if the declaration is accessible. When the name resolves to
30734 set of overloaded functions, accessibility is checked when
30735 overload resolution is done. If we have a TREE_LIST, then the lookup
30736 is either ambiguous or it found multiple injected-class-names, the
30737 accessibility of which is trivially satisfied.
30739 During an explicit instantiation, access is not checked at all,
30740 as per [temp.explicit]. */
30743 tf_warning_or_error);
30745 /* Pull out the template from an injected-class-name (or multiple). */
30749 /* If it's a TREE_LIST, the result of the lookup was ambiguous. */
30751 {
30754 /* The error message we have to print is too complicated for
30755 cp_parser_error, so we incorporate its actions directly. */
30757 {
30759 name);
30761 }
30763 }
30774 }
30776 /* Like cp_parser_lookup_name, but for use in the typical case where
30777 CHECK_ACCESS is TRUE, IS_TYPE is FALSE, IS_TEMPLATE is FALSE,
30778 IS_NAMESPACE is FALSE, and CHECK_DEPENDENCY is TRUE. */
30780 static tree
30782 {
30784 none_type,
30789 location);
30790 }
30792 /* If DECL is a TEMPLATE_DECL that can be treated like a TYPE_DECL in
30793 the current context, return the TYPE_DECL. If TAG_NAME_P is
30794 true, the DECL indicates the class being defined in a class-head,
30795 or declared in an elaborated-type-specifier.
30797 Otherwise, return DECL. */
30799 static tree
30801 {
30802 /* If the TEMPLATE_DECL is being declared as part of a class-head,
30803 the translation from TEMPLATE_DECL to TYPE_DECL occurs:
30805 struct A {
30806 template <typename T> struct B;
30807 };
30809 template <typename T> struct A::B {};
30811 Similarly, in an elaborated-type-specifier:
30813 namespace N { struct X{}; }
30815 struct A {
30816 template <typename T> friend struct N::X;
30817 };
30819 However, if the DECL refers to a class type, and we are in
30820 the scope of the class, then the name lookup automatically
30821 finds the TYPE_DECL created by build_self_reference rather
30822 than a TEMPLATE_DECL. For example, in:
30824 template <class T> struct S {
30825 S s;
30826 };
30828 there is no need to handle such case. */
30834 }
30836 /* If too many, or too few, template-parameter lists apply to the
30837 declarator, issue an error message. Returns TRUE if all went well,
30838 and FALSE otherwise. */
30840 static bool
30843 location_t declarator_location)
30844 {
30846 {
30848 {
30857 {
30858 /* If the DECLARATOR has the form `X<y>' then it uses one
30859 additional level of template parameters. */
30862 }
30864 return cp_parser_check_template_parameters
30866 declarator);
30867 }
30883 }
30885 }
30887 /* NUM_TEMPLATES were used in the current declaration. If that is
30888 invalid, return FALSE and issue an error messages. Otherwise,
30889 return TRUE. If DECLARATOR is non-NULL, then we are checking a
30890 declarator and we can print more accurate diagnostics. */
30892 static bool
30896 location_t location,
30898 {
30899 /* If there are the same number of template classes and parameter
30900 lists, that's OK. */
30903 /* If there are more, but only one more, and the name ends in an identifier,
30904 then we are declaring a primary template. That's OK too. */
30912 /* If there are more template classes than parameter lists, we have
30913 something like:
30915 template <class T> void S<T>::R<T>::f (); */
30917 {
30927 else
30930 }
30931 /* Otherwise, there are too many template parameter lists. We have
30932 something like:
30934 template <class T> template <class U> void S::f(); */
30937 }
30939 /* Parse an optional `::' token indicating that the following name is
30940 from the global namespace. If so, PARSER->SCOPE is set to the
30941 GLOBAL_NAMESPACE. Otherwise, PARSER->SCOPE is set to NULL_TREE,
30942 unless CURRENT_SCOPE_VALID_P is TRUE, in which case it is left alone.
30943 Returns the new value of PARSER->SCOPE, if the `::' token is
30944 present, and NULL_TREE otherwise. */
30946 static tree
30948 {
30951 /* Peek at the next token. */
30953 /* If we're looking at a `::' token then we're starting from the
30954 global namespace, not our current location. */
30956 {
30957 /* Consume the `::' token. */
30959 /* Set the SCOPE so that we know where to start the lookup. */
30965 }
30967 {
30971 }
30974 }
30976 /* Returns TRUE if the upcoming token sequence is the start of a
30977 constructor declarator or C++17 deduction guide. If FRIEND_P is true, the
30978 declarator is preceded by the `friend' specifier. The parser flags FLAGS
30979 is used to control type-specifier parsing. */
30981 static bool
30984 {
30987 tree nested_name_specifier;
30990 /* The common case is that this is not a constructor declarator, so
30991 try to avoid doing lots of work if at all possible. It's not
30992 valid declare a constructor at function scope. */
30995 /* And only certain tokens can begin a constructor declarator. */
31000 /* DR 2237 (C++20 only): A simple-template-id is no longer valid as the
31001 declarator-id of a constructor or destructor. */
31005 /* Parse tentatively; we are going to roll back all of the tokens
31006 consumed here. */
31008 /* Assume that we are looking at a constructor declarator. */
31011 /* Look for the optional `::' operator. */
31014 /* Look for the nested-name-specifier. */
31015 nested_name_specifier
31022 /* Resolve the TYPENAME_TYPE, because the call above didn't do it. */
31025 {
31030 }
31036 /* Outside of a class-specifier, there must be a
31037 nested-name-specifier. Except in C++17 mode, where we
31038 might be declaring a guiding declaration. */
31045 /* If we have a class scope, this is easy; DR 147 says that S::S always
31046 names the constructor, and no other qualified name could. */
31049 {
31059 }
31060 /* If we still think that this might be a constructor-declarator,
31061 look for a class-name. */
31063 {
31064 /* If we have:
31066 template <typename T> struct S {
31067 S();
31068 };
31070 we must recognize that the nested `S' names a class. */
31074 tree type_decl;
31078 none_type,
31085 {
31091 none_type,
31096 else
31098 }
31100 /* If there was no class-name, then this is not a constructor.
31101 Otherwise, if we are in a class-specifier and we aren't
31102 handling a friend declaration, check that its type matches
31103 current_class_type (c++/38313). Note: error_mark_node
31104 is left alone for error recovery purposes. */
31106 && (outside_class_specifier_p
31112 /* If we're still considering a constructor, we have to see a `(',
31113 to begin the parameter-declaration-clause, followed by either a
31114 `)', an `...', or a decl-specifier. We need to check for a
31115 type-specifier to avoid being fooled into thinking that:
31117 S (f) (int);
31119 is a constructor. (It is actually a function named `f' that
31120 takes one parameter (of type `int') and returns a value of type
31121 `S'. */
31129 /* A parameter declaration begins with a decl-specifier,
31130 which is either the "attribute" keyword, a storage class
31131 specifier, or (usually) a type-specifier. */
31133 /* GNU attributes can actually appear both at the start of
31134 a parameter and parenthesized declarator.
31135 S (__attribute__((unused)) int);
31136 is a constructor, but
31137 S (__attribute__((unused)) foo) (int);
31138 is a function declaration. [[attribute]] can appear in the
31139 first form too, but not in the second form. */
31141 {
31142 tree type;
31148 {
31152 }
31154 /* Names appearing in the type-specifier should be looked up
31155 in the scope of the class. */
31159 {
31162 {
31166 {
31169 }
31170 }
31172 }
31174 /* Inside the constructor parameter list, surrounding
31175 template-parameter-lists do not apply. */
31176 saved_num_template_parameter_lists
31180 /* Look for the type-specifier. It's not optional, but its typename
31181 might be. Unless this is a friend declaration; we don't want to
31182 treat
31184 friend S (T::fn)(int);
31186 as a constructor, but with P0634, we might assume a type when
31187 looking for the type-specifier. It is actually a function named
31188 `T::fn' that takes one parameter (of type `int') and returns a
31189 value of type `S'. Constructors can be friends, but they must
31190 use a qualified name.
31192 Parse with an empty set of declaration specifiers since we're
31193 trying to match a decl-specifier-seq of the first parameter.
31194 This must be non-null so that cp_parser_simple_type_specifier
31195 will recognize a constrained placeholder type such as:
31196 'C<int> auto' where C is a type concept. */
31197 cp_decl_specifier_seq ctor_specs;
31207 parser->num_template_parameter_lists
31210 /* Leave the scope of the class. */
31215 }
31216 }
31218 /* We did not really want to consume any tokens. */
31222 }
31224 /* Parse the definition of the function given by the DECL_SPECIFIERS,
31225 ATTRIBUTES, and DECLARATOR. The access checks have been deferred;
31226 they must be performed once we are in the scope of the function.
31228 Returns the function defined. */
31230 static tree
31231 cp_parser_function_definition_from_specifiers_and_declarator
31234 tree attributes,
31236 {
31237 tree fn;
31240 /* Begin the function-definition. */
31243 /* The things we're about to see are not directly qualified by any
31244 template headers we've seen thus far. */
31247 /* If there were names looked up in the decl-specifier-seq that we
31248 did not check, check them now. We must wait until we are in the
31249 scope of the function to perform the checks, since the function
31250 might be a friend. */
31254 {
31259 }
31262 {
31263 /* Skip the entire function. */
31266 }
31268 {
31269 /* Seen already, skip it. An error message has already been output. */
31273 /* If this is a function from a class, pop the nested class. */
31276 }
31277 else
31278 {
31279 timevar_id_t tv;
31282 else
31288 }
31291 }
31293 /* Parse the part of a function-definition that follows the
31294 declarator. INLINE_P is TRUE iff this function is an inline
31295 function defined within a class-specifier.
31297 Returns the function defined. */
31299 static tree
31302 {
31303 tree fn;
31308 bool fully_implicit_function_template_p
31311 tree implicit_template_parms
31314 cp_binding_level* implicit_template_scope
31320 /* If the next token is `return', then the code may be trying to
31321 make use of the "named return value" extension that G++ used to
31322 support. */
31325 {
31326 /* Consume the `return' keyword. */
31328 /* Look for the identifier that indicates what value is to be
31329 returned. */
31331 /* Issue an error message. */
31334 /* Skip tokens until we reach the start of the function body. */
31336 {
31343 }
31344 }
31345 /* The `extern' in `extern "C" void f () { ... }' does not apply to
31346 anything declared inside `f'. */
31347 saved_in_unbraced_linkage_specification_p
31350 /* Inside the function, surrounding template-parameter-lists do not
31351 apply. */
31352 saved_num_template_parameter_lists
31356 /* If the next token is `try', `__transaction_atomic', or
31357 `__transaction_relaxed`, then we are looking at either function-try-block
31358 or function-transaction-block. Note that all of these include the
31359 function-body. */
31363 RID_TRANSACTION_RELAXED))
31367 else
31368 cp_parser_ctor_initializer_opt_and_function_body
31371 /* Finish the function. */
31375 && !inline_p
31381 /* Generate code for it, if necessary. */
31383 /* Restore the saved values. */
31384 parser->in_unbraced_linkage_specification_p
31386 parser->num_template_parameter_lists
31390 parser->fully_implicit_function_template_p
31392 parser->implicit_template_parms
31394 parser->implicit_template_scope
31401 }
31403 /* Parse a template-declaration body (following argument list). */
31405 static void
31407 tree parameter_list,
31409 {
31413 /* We just processed one more parameter list. */
31416 /* Get the deferred access checks from the parameter list. These
31417 will be checked once we know what is being declared, as for a
31418 member template the checks must be performed in the scope of the
31419 class containing the member. */
31422 /* Tentatively parse for a new template parameter list, which can either be
31423 the template keyword or a template introduction. */
31432 /* Allow 'concept bool' to be handled as per the TS. */
31434 else
31435 {
31438 checks,
31439 member_p,
31443 /* If this is a member template declaration, let the front
31444 end know. */
31446 {
31451 }
31456 }
31457 /* We are done with the current parameter list. */
31462 /* Finish up. */
31465 /* Check the template arguments for a literal operator template. */
31469 {
31473 else
31474 {
31477 {
31484 /* OK, C++20 string literal operator template. We don't need
31485 to warn in lower dialects here because we will have already
31490 }
31492 {
31501 else
31502 /* http://cplusplus.github.io/EWG/ewg-active.html#66 */
31504 "ISO C++ did not adopt string literal operator templa"
31506 }
31507 else
31509 }
31511 {
31514 "template %qD has invalid parameter list; expected "
31515 "non-type template parameter pack %<<char...>%> or "
31517 decl);
31518 else
31520 "template %qD has invalid parameter list; expected "
31522 decl);
31523 }
31524 }
31526 /* Register member declarations. */
31529 /* If DECL is a function template, we must return to parse it later.
31530 (Even though there is no definition, there might be default
31531 arguments that need handling.) */
31535 }
31537 /* Parse a template introduction header for a template-declaration. Returns
31538 false if tentative parse fails. */
31540 static bool
31542 {
31552 /* In classes don't parse valid unnamed bitfields as invalid
31553 template introductions. */
31557 /* Look for the optional `::' operator. */
31560 /* Look for the nested-name-specifier. */
31570 /* Look up the concept for which we will be matching
31571 template parameters. */
31583 /* Look for opening brace for introduction. */
31584 matching_braces braces;
31593 /* Build vector of placeholder parameters and grab
31594 matching identifiers. */
31597 /* Look for closing brace for introduction. */
31601 /* The introduction-list shall not be empty. */
31604 {
31605 /* In cp_parser_introduction_list we have already issued an error. */
31607 }
31610 {
31614 }
31616 /* Build and associate the constraint. */
31621 introduction_list,
31622 introduction_loc);
31624 {
31631 member_p);
31633 }
31639 }
31641 /* Parse a normal template-declaration following the template keyword. */
31643 static void
31645 {
31646 tree parameter_list;
31650 /* Look for the `<' token. */
31654 {
31655 /* 14.5.2.2 [temp.mem]
31657 A local class shall not have member templates. */
31662 }
31663 /* [temp]
31665 A template ... shall not have C linkage. */
31667 {
31670 /* Give it C++ linkage to avoid confusing other parts of the
31671 front end. */
31674 }
31675 else
31678 /* We cannot perform access checks on the template parameter
31679 declarations until we know what is being declared, just as we
31680 cannot check the decl-specifier list. */
31683 /* If the next token is `>', then we have an invalid
31684 specialization. Rather than complain about an invalid template
31685 parameter, issue an error message here. */
31687 {
31691 }
31692 else
31693 {
31694 /* Parse the template parameters. */
31696 }
31698 /* Look for the `>'. */
31701 /* Manage template requirements */
31703 {
31708 }
31711 member_p);
31713 /* For the erroneous case of a template with C linkage, we pushed an
31714 implicit C++ linkage scope; exit that scope now. */
31717 }
31719 /* Parse a template-declaration, assuming that the `export' (and
31720 `extern') keywords, if present, has already been scanned. MEMBER_P
31721 is as for cp_parser_template_declaration. */
31723 static bool
31725 {
31727 {
31731 }
31736 }
31738 /* Perform the deferred access checks from a template-parameter-list.
31739 CHECKS is a TREE_LIST of access checks, as returned by
31740 get_deferred_access_checks. */
31742 static void
31743 cp_parser_perform_template_parameter_access_checks (vec<deferred_access_check, va_gc> *checks)
31744 {
31748 }
31750 /* Parse a `decl-specifier-seq [opt] init-declarator [opt] ;' or
31751 `function-definition' sequence that follows a template header.
31752 If MEMBER_P is true, this declaration appears in a class scope.
31754 Returns the DECL for the declared entity. If FRIEND_P is non-NULL,
31755 *FRIEND_P is set to TRUE iff the declaration is a friend. */
31757 static tree
31763 {
31766 cp_decl_specifier_seq decl_specifiers;
31770 /* This function is only used when processing a template
31771 declaration. */
31775 /* Defer access checks until we know what is being declared. */
31778 /* Try the `decl-specifier-seq [opt] init-declarator [opt]'
31779 alternative. */
31782 (CP_PARSER_FLAGS_OPTIONAL
31787 cp_omp_declare_simd_data odsd;
31796 /* There are no template typedefs. */
31798 {
31802 }
31804 /* Gather up the access checks that occurred the
31805 decl-specifier-seq. */
31808 /* Check for the declaration of a template class. */
31810 {
31813 {
31816 /* In this case:
31818 struct C {
31819 friend template <typename T> struct A<T>::B;
31820 };
31822 A<T>::B will be represented by a TYPENAME_TYPE, and
31823 therefore not recognized by shadow_tag. */
31825 && !decl
31832 else
31835 /* If this is a declaration, but not a definition, associate
31836 any constraints with the type declaration. Constraints
31837 are associated with definitions in cp_parser_class_specifier. */
31841 /* Perform access checks for template parameters. */
31844 /* Give a helpful diagnostic for
31845 template <class T> struct A { } a;
31846 if we aren't already recovering from an error. */
31849 {
31851 "a class template declaration must not declare "
31855 }
31856 }
31857 }
31859 /* Complain about missing 'typename' or other invalid type names. */
31862 {
31863 /* cp_parser_parse_and_diagnose_invalid_type_name calls
31864 cp_parser_skip_to_end_of_block_or_statement, so don't try to parse
31865 the rest of this declaration. */
31868 }
31870 /* If it's not a template class, try for a template function. If
31871 the next token is a `;', then this declaration does not declare
31872 anything. But, if there were errors in the decl-specifiers, then
31873 the error might well have come from an attempted class-specifier.
31874 In that case, there's no need to warn about a missing declarator. */
31878 {
31880 /* We don't delay parsing for friends, though CWG 2510 may change
31881 that. */
31885 flags,
31887 checks,
31889 member_p,
31890 declares_class_or_enum,
31894 /* 7.1.1-1 [dcl.stc]
31896 A storage-class-specifier shall not be specified in an explicit
31897 specialization... */
31899 && explicit_specialization_p
31901 {
31905 }
31909 }
31911 /* Look for a trailing `;' after the declaration. */
31917 out:
31920 /* Clear any current qualification; whatever comes next is the start
31921 of something new. */
31929 }
31931 /* Parse a cast-expression that is not the operand of a unary "&". */
31933 static cp_expr
31935 {
31938 }
31940 /* Parse a functional cast to TYPE. Returns an expression
31941 representing the cast. */
31943 static cp_expr
31945 {
31947 tree expression_list;
31948 cp_expr cast;
31957 {
31967 /* Create a location of the form:
31968 type_name{i, f}
31969 ^~~~~~~~~~~~~~~
31970 with caret == start at the start of the type name,
31971 finishing at the closing brace. */
31976 }
31985 else
31986 {
31989 }
31991 /* Create a location of the form:
31992 float(i)
31993 ^~~~~~~~
31994 with caret == start at the start of the type name,
31995 finishing at the closing paren. */
31999 tf_warning_or_error);
32001 /* [expr.const]/1: In an integral constant expression "only type
32002 conversions to integral or enumeration type can be used". */
32008 NIC_CONSTRUCTOR))
32012 }
32014 /* Save the tokens that make up the body of a member function defined
32015 in a class-specifier. The DECL_SPECIFIERS and DECLARATOR have
32016 already been parsed. The ATTRIBUTES are any GNU "__attribute__"
32017 specifiers applied to the declaration. Returns the FUNCTION_DECL
32018 for the member function. */
32020 static tree
32024 tree attributes)
32025 {
32028 tree fn;
32031 /* Create the FUNCTION_DECL. */
32035 /* If something went badly wrong, bail out now. */
32037 {
32038 /* If there's a function-body, skip it. */
32043 }
32045 /* Remember it, if there are default args to post process. */
32048 /* Save away the tokens that make up the body of the
32049 function. */
32055 RID_TRANSACTION_ATOMIC))
32056 {
32058 /* Match cp_parser_txn_attribute_opt [[ identifier ]]. */
32065 {
32071 }
32072 else
32075 {
32079 }
32080 }
32082 /* Handle function try blocks. */
32084 {
32087 }
32088 /* We can have braced-init-list mem-initializers before the fn body. */
32090 {
32093 {
32094 /* cache_group will stop after an un-nested { } pair, too. */
32098 /* variadic mem-inits have ... after the ')'. */
32101 }
32102 }
32104 /* Handle function try blocks. */
32110 /* Save away the inline definition; we will process it when the
32111 class is complete. */
32115 /* We need to know that this was defined in the class, so that
32116 friend templates are handled correctly. */
32119 /* Add FN to the queue of functions to be parsed later. */
32123 }
32125 /* Save the tokens that make up the in-class initializer for a non-static
32126 data member. Returns a DEFERRED_PARSE. */
32128 static tree
32130 {
32132 }
32134 /* Parse a template-argument-list, as well as the trailing ">" (but
32135 not the opening "<"). See cp_parser_template_argument_list for the
32136 return value. */
32138 static tree
32140 {
32141 tree arguments;
32142 tree saved_scope;
32143 tree saved_qualifying_scope;
32144 tree saved_object_scope;
32147 /* [temp.names]
32149 When parsing a template-id, the first non-nested `>' is taken as
32150 the end of the template-argument-list rather than a greater-than
32151 operator. */
32152 saved_greater_than_is_operator_p
32155 /* Parsing the argument list may modify SCOPE, so we save it
32156 here. */
32160 /* We need to evaluate the template arguments, even though this
32161 template-id may be nested within a "sizeof". */
32162 cp_evaluated ev;
32163 /* Parse the template-argument-list itself. */
32168 {
32171 }
32172 else
32174 /* Look for the `>' that ends the template-argument-list. If we find
32175 a '>>' instead, it's probably just a typo. */
32177 {
32179 {
32180 /* In C++0x, a `>>' in a template argument list or cast
32181 expression is considered to be two separate `>'
32182 tokens. So, change the current token to a `>', but don't
32183 consume it: it will be consumed later when the outer
32184 template argument list (or cast expression) is parsed.
32185 Note that this replacement of `>' for `>>' is necessary
32186 even if we are parsing tentatively: in the tentative
32187 case, after calling
32188 cp_parser_enclosed_template_argument_list we will always
32189 throw away all of the template arguments and the first
32190 closing `>', either because the template argument list
32191 was erroneous or because we are replacing those tokens
32192 with a CPP_TEMPLATE_ID token. The second `>' (which will
32193 not have been thrown away) is needed either to close an
32194 outer template argument list or to complete a new-style
32195 cast. */
32198 }
32200 {
32201 /* If we're in a nested template argument list, the '>>' has
32202 to be a typo for '> >'. We emit the error message, but we
32203 continue parsing and we push a '>' as next token, so that
32204 the argument list will be parsed correctly. Note that the
32205 global source location is still on the token before the
32206 '>>', so we need to say explicitly where we want it. */
32214 }
32215 else
32216 {
32217 /* If this is not a nested template argument list, the '>>'
32218 is a typo for '>'. Emit an error message and continue.
32219 Same deal about the token location, but here we can get it
32220 right by consuming the '>>' before issuing the diagnostic. */
32223 "spurious %<>>%>, use %<>%> to terminate "
32225 }
32226 }
32227 /* Similarly for >>= and >=. */
32230 {
32236 {
32239 }
32241 {
32244 else
32247 }
32248 else
32249 {
32252 }
32258 }
32259 else
32261 /* The `>' token might be a greater-than operator again now. */
32262 parser->greater_than_is_operator_p
32264 /* Restore the SAVED_SCOPE. */
32270 }
32272 /* MEMBER_FUNCTION is a member function, or a friend. If default
32273 arguments, or the body of the function have not yet been parsed,
32274 parse them now. */
32276 static void
32278 {
32280 /* If this member is a template, get the underlying
32281 FUNCTION_DECL. */
32285 /* There should not be any class definitions in progress at this
32286 point; the bodies of members are only parsed outside of all class
32287 definitions. */
32289 /* While we're parsing the member functions we might encounter more
32290 classes. We want to handle them right away, but we don't want
32291 them getting mixed up with functions that are currently in the
32292 queue. */
32295 /* Make sure that any template parameters are in scope. */
32298 /* If the body of the function has not yet been parsed, parse it
32299 now. Except if the tokens have been purged (PR c++/39751). */
32302 {
32303 tree function_scope;
32306 /* The function is no longer pending; we are processing it. */
32311 /* If this is a local class, enter the scope of the containing
32312 function. */
32317 /* Push the body of the function onto the lexer stack. */
32320 /* Let the front end know that we going to be defining this
32321 function. */
32325 /* #pragma omp declare reduction needs special parsing. */
32327 {
32332 }
32333 else
32334 /* Now, parse the body of the function. */
32338 /* Leave the scope of the containing function. */
32342 }
32344 /* Remove any template parameters from the symbol table. */
32347 /* Restore the queue. */
32350 }
32352 /* If DECL contains any default args, remember it on the unparsed
32353 functions queue. */
32355 static void
32357 {
32358 tree probe;
32361 probe;
32364 {
32368 }
32370 /* Remember if there is a noexcept-specifier to post process. */
32374 }
32376 /* DEFAULT_ARG contains the saved tokens for the initializer of DECL,
32377 which is either a FIELD_DECL or PARM_DECL. Parse it and return
32378 the result. For a PARM_DECL, PARMTYPE is the corresponding type
32379 from the parameter-type-list. */
32381 static tree
32384 {
32386 tree parsed_arg;
32392 /* Push the saved tokens for the default argument onto the parser's
32393 lexer stack. */
32399 /* Parse the default argument. */
32410 {
32411 /* In a non-template class, check conversions now. In a template,
32412 we'll wait and instantiate these as needed. */
32415 tf_warning_or_error);
32418 else
32420 }
32422 /* If the token stream has not been completely used up, then
32423 there was extra junk after the end of the default
32424 argument. */
32426 {
32429 else
32431 }
32433 /* Revert to the main lexer. */
32437 }
32439 /* FIELD is a non-static data member with an initializer which we saved for
32440 later; parse it now. */
32442 static void
32444 {
32445 tree def;
32452 NULL_TREE);
32458 }
32460 /* FN is a FUNCTION_DECL which may contains a parameter with an
32461 unparsed DEFERRED_PARSE. Parse the default args now. This function
32462 assumes that the current scope is the scope in which the default
32463 argument should be processed. */
32465 static void
32467 {
32470 /* While we're parsing the default args, we might (due to the
32471 statement expression extension) encounter more classes. We want
32472 to handle them right away, but we don't want them getting mixed
32473 up with default args that are currently in the queue. */
32476 /* Local variable names (and the `this' keyword) may not appear
32477 in a default argument. */
32485 /* Gather the PARM_DECLs into a vec so we can keep track of them when
32486 pushdecl clears DECL_CHAIN. */
32487 releasing_vec parms;
32497 {
32499 tree parsed_arg;
32508 /* This can happen for a friend declaration for a function
32509 already declared with default arguments. */
32512 parsed_arg
32514 default_arg,
32518 /* Update any instantiations we've already created. */
32521 }
32525 /* Restore DECL_CHAINs after clobbering by pushdecl. */
32528 {
32531 }
32535 /* Make sure no default arg is missing. */
32538 /* Restore the state of local_variables_forbidden_p. */
32541 /* Restore the queue. */
32543 }
32545 /* Subroutine of cp_parser_sizeof_operand, for handling C++11
32547 sizeof ... ( identifier )
32549 where the 'sizeof' token has already been consumed. */
32551 static tree
32553 {
32554 /* Consume the `...'. */
32558 matching_parens parens;
32562 else
32570 /* The name is not qualified. */
32590 }
32592 /* Parse the operand of `sizeof' (or a similar operator). Returns
32593 either a TYPE or an expression, depending on the form of the
32594 input. The KEYWORD indicates which kind of expression we have
32595 encountered. */
32597 static tree
32599 {
32606 /* If it's a `...', then we are computing the length of a parameter
32607 pack. */
32612 /* Types cannot be defined in a `sizeof' expression. Save away the
32613 old message. */
32616 parser->type_definition_forbidden_message
32618 parser->type_definition_forbidden_message_arg
32621 /* The restrictions on constant-expressions do not apply inside
32622 sizeof expressions. */
32623 saved_integral_constant_expression_p
32625 saved_non_integral_constant_expression_p
32632 /* Do not actually evaluate the expression. */
32635 /* If it's a `(', then we might be looking at the type-id
32636 construction. */
32638 {
32643 /* We can't be sure yet whether we're looking at a type-id or an
32644 expression. */
32647 matching_parens parens;
32650 /* Note: as a GNU Extension, compound literals are considered
32651 postfix-expressions as they are in C99, so they are valid
32652 arguments to sizeof. See comment in cp_parser_cast_expression
32653 for details. */
32656 else
32657 {
32660 /* Look for the type-id. */
32662 /* Look for the closing `)'. */
32665 }
32667 /* If all went well, then we're done. */
32670 else
32671 {
32672 /* Commit to the tentative_firewall so we get syntax errors. */
32676 }
32677 }
32678 else
32681 /* Go back to evaluating expressions. */
32685 /* And restore the old one. */
32688 parser->integral_constant_expression_p
32690 parser->non_integral_constant_expression_p
32694 }
32696 /* If the current declaration has no declarator, return true. */
32698 static bool
32700 {
32701 /* If the next token is a `;' or a `,' then there is no
32702 declarator. */
32705 }
32707 /* Update the DECL_SPECS to reflect the storage class indicated by
32708 KEYWORD. */
32710 static void
32715 {
32716 cp_storage_class storage_class;
32719 {
32723 }
32725 {
32728 }
32733 {
32736 }
32739 {
32757 }
32761 /* A storage class specifier cannot be applied alongside a typedef
32762 specifier. If there is a typedef specifier present then set
32763 conflicting_specifiers_p which will trigger an error later
32764 on in grokdeclarator. */
32767 }
32769 /* Update the DECL_SPECS to reflect the TYPE_SPEC. If TYPE_DEFINITION_P
32770 is true, the type is a class or enum definition. */
32772 static void
32774 tree type_spec,
32777 {
32780 /* If the user tries to redeclare bool, char8_t, char16_t, char32_t, or
32781 wchar_t (with, for example, in "typedef int wchar_t;") we remember that
32782 this is what happened. In system headers, we ignore these
32783 declarations so that G++ can work with system headers that are not
32784 C++-safe. */
32786 && !type_definition_p
32797 {
32800 ds_redefined_builtin_type_spec,
32801 token);
32803 {
32807 }
32808 }
32811 else
32812 {
32817 }
32818 }
32820 /* True iff TOKEN is the GNU keyword __thread. */
32822 static bool
32824 {
32827 }
32829 /* Set the location for a declarator specifier and check if it is
32830 duplicated.
32832 DECL_SPECS is the sequence of declarator specifiers onto which to
32833 set the location.
32835 DS is the single declarator specifier to set which location is to
32836 be set onto the existing sequence of declarators.
32838 LOCATION is the location for the declarator specifier to
32839 consider. */
32841 static void
32844 {
32853 {
32857 }
32858 else
32859 {
32861 {
32865 else
32866 {
32869 OPT_Wlong_long,
32871 }
32872 }
32874 {
32878 {
32882 }
32883 else
32884 {
32887 }
32888 }
32889 else
32890 {
32908 "consteval"
32909 };
32913 }
32914 }
32915 }
32917 /* Return true iff the declarator specifier DS is present in the
32918 sequence of declarator specifiers DECL_SPECS. */
32920 bool
32922 cp_decl_spec ds)
32923 {
32930 }
32932 /* DECL_SPECIFIERS is the representation of a decl-specifier-seq.
32933 Returns TRUE iff `friend' appears among the DECL_SPECIFIERS. */
32935 static bool
32937 {
32939 }
32941 /* Issue an error message indicating that TOKEN_DESC was expected.
32942 If KEYWORD is true, it indicated this function is called by
32943 cp_parser_require_keword and the required token can only be
32944 a indicated keyword.
32946 If MATCHING_LOCATION is not UNKNOWN_LOCATION, then highlight it
32947 within any error as the location of an "opening" token matching
32948 the close token TYPE (e.g. the location of the '(' when TOKEN_DESC is
32949 RT_CLOSE_PAREN). */
32951 static void
32953 required_token token_desc,
32955 location_t matching_location)
32956 {
32962 {
33037 }
33040 {
33042 {
33120 }
33121 }
33125 }
33128 /* If the next token is of the indicated TYPE, consume it. Otherwise,
33129 issue an error message indicating that TOKEN_DESC was expected.
33131 Returns the token consumed, if the token had the appropriate type.
33132 Otherwise, returns NULL.
33134 If MATCHING_LOCATION is not UNKNOWN_LOCATION, then highlight it
33135 within any error as the location of an "opening" token matching
33136 the close token TYPE (e.g. the location of the '(' when TOKEN_DESC is
33137 RT_CLOSE_PAREN). */
33142 required_token token_desc,
33143 location_t matching_location)
33144 {
33147 else
33148 {
33149 /* Output the MESSAGE -- unless we're parsing tentatively. */
33152 matching_location);
33154 }
33155 }
33157 /* Skip an entire parameter list from start to finish. The next token must
33158 be the initial "<" of the parameter list. Returns true on success and
33159 false otherwise. */
33161 static bool
33163 {
33164 /* Consume the "<" because cp_parser_skip_to_end_of_template_parameter_list
33165 requires it. */
33168 }
33170 /* Ensure we are at the end of a template parameter list. If we are, return.
33171 If we are not, something has gone wrong, in which case issue an error and
33172 skip to end of the parameter list. */
33174 static void
33176 {
33177 /* Are we ready, yet? If not, issue error message. */
33182 }
33184 /* You should only call this function from inside a template parameter list
33185 (i.e. the current token should at least be the initial "<" of the
33186 parameter list). If you are skipping the entire list, it may be better to
33187 use cp_parser_skip_entire_template_parameter_list.
33189 Tokens are skipped until the final ">" is found, or if we see
33190 '{', '}', ';', or if we find an unbalanced ')' or ']'.
33192 Returns true if we successfully reached the end, and false if
33193 something unexpected happened (e.g. end of file). */
33195 static bool
33197 {
33198 /* Current level of '< ... >'. */
33200 /* Ignore '<' and '>' nested inside '( ... )' or '[ ... ]'. */
33203 /* Skip tokens until the desired token is found. */
33205 {
33206 /* Peek at the next token. */
33208 {
33216 /* C++0x views the `>>' operator as two `>' tokens, but
33217 C++98 does not. */
33220 {
33221 /* We've hit a `>>' where the first `>' closes the
33222 template argument list, and the second `>' is
33223 spurious. Just consume the `>>' and stop; we've
33224 already produced at least one error. */
33227 }
33228 /* Fall through for C++0x, so we handle the second `>' in
33229 the `>>'. */
33234 {
33235 /* We've reached the token we want, consume it and stop. */
33238 }
33257 /* The '>' was probably forgotten, don't look further. */
33262 }
33264 /* Consume this token. */
33266 }
33267 }
33269 /* If the next token is the indicated keyword, consume it. Otherwise,
33270 issue an error message indicating that TOKEN_DESC was expected.
33272 Returns the token consumed, if the token had the appropriate type.
33273 Otherwise, returns NULL. */
33278 required_token token_desc)
33279 {
33283 {
33285 UNKNOWN_LOCATION);
33287 }
33290 }
33292 /* Returns TRUE iff TOKEN is a token that can begin the body of a
33293 function-definition. */
33295 static bool
33297 {
33300 /* A ctor-initializer begins with a `:'. */
33302 /* A function-try-block begins with `try'. */
33304 /* A function-transaction-block begins with `__transaction_atomic'
33305 or `__transaction_relaxed'. */
33308 /* The named return value extension begins with `return'. */
33310 }
33312 /* Returns TRUE iff the next token is the ":" or "{" beginning a class
33313 definition. */
33315 static bool
33317 {
33324 }
33326 /* Returns TRUE iff the next token is the "," or ">" (or `>>', in
33327 C++0x) ending a template-argument. */
33329 static bool
33331 {
33339 /* For better diagnostics, treat >>= like that too, that
33340 shouldn't appear non-nested in template arguments. */
33342 }
33344 /* Returns TRUE iff the n-th token is a "<", or the n-th is a "[" and the
33345 (n+1)-th is a ":" (which is a possible digraph typo for "< ::"). */
33347 static bool
33350 {
33356 /* Check for the sequence `<::' in the original code. It would be lexed as
33357 `[:', where `[' is a digraph, and there is no whitespace before
33358 `:'. */
33360 {
33365 }
33367 }
33369 /* Returns the kind of tag indicated by TOKEN, if it is a class-key,
33370 or none_type otherwise. */
33372 static enum tag_types
33374 {
33376 {
33386 }
33387 }
33389 /* Returns the kind of tag indicated by TOKEN, if it is a type-parameter-key,
33390 or none_type otherwise or if the token is null. */
33392 static enum tag_types
33394 {
33399 {
33407 }
33408 }
33410 /* Diagnose redundant enum-keys. */
33412 static void
33415 {
33421 /* Look up the NAME to see if it unambiguously refers to the TYPE. */
33426 /* The enum-key is redundant for uses of the TYPE that are not
33427 declarations and for which name lookup returns just the type
33428 itself. */
33436 {
33437 /* Avoid issuing the diagnostic for apparently redundant (unscoped)
33438 enum tag in shared C/C++ code in files (such as headers) included
33439 in the main source file. */
33442 LRK_MACRO_DEFINITION_LOCATION,
33446 }
33454 }
33456 /* Describes the set of declarations of a struct, class, or class template
33457 or its specializations. Used for -Wmismatched-tags. */
33459 class class_decl_loc_t
33460 {
33465 {
33467 }
33469 /* Constructs an object for a single declaration of a class with
33470 CLASS_KEY at the current location in the current function (or
33471 at another scope). KEY_REDUNDANT is true if the class-key may
33472 be omitted in the current context without an ambiguity with
33473 another symbol with the same name.
33474 DEF_P is true for a class declaration that is a definition.
33475 CURLOC is the associated location. */
33479 {
33482 key_redundant);
33484 }
33486 /* Copy, assign, and destroy the object. Necessary because LOCVEC
33487 isn't safely copyable and assignable and doesn't release storage
33488 on its own. */
33492 { }
33495 {
33503 }
33506 {
33508 }
33510 /* Issues -Wmismatched-tags for a single class. */
33513 /* Issues -Wmismatched-tags for all classes. */
33516 /* Adds TYPE_DECL to the collection of class decls and diagnoses
33517 redundant tags (if -Wredundant-tags is enabled). */
33520 /* Either adds this decl to the collection of class decls
33521 or diagnoses it, whichever is appropriate. */
33527 {
33529 }
33532 {
33534 }
33537 {
33539 }
33542 {
33544 }
33546 /* True if a definition for the class has been seen. */
33548 {
33550 }
33552 /* The location of a single mention of a class type with the given
33553 class-key. */
33554 struct class_key_loc_t
33555 {
33558 { }
33560 /* The function the type is mentioned in. */
33561 tree func;
33562 /* The exact location. */
33563 location_t loc;
33564 /* The class-key used in the mention of the type. */
33565 tag_types class_key;
33566 /* True when the class-key could be omitted at this location
33567 without an ambiguity with another symbol of the same name. */
33569 };
33570 /* Avoid using auto_vec here since it's not safe to copy due to pr90904. */
33572 /* LOCVEC index of the definition or UINT_MAX if none exists. */
33574 /* The class-key the class was last declared with or none_type when
33575 it has been declared with a mismatched key. */
33576 tag_types def_class_key;
33578 /* A mapping between a TYPE_DECL for a class and the class_decl_loc_t
33579 description above. */
33582 };
33586 /* Issue an error message if the CLASS_KEY does not match the TYPE.
33587 DEF_P is expected to be set for a definition of class TYPE. DECL_P
33588 is set for a declaration of class TYPE and clear for a reference to
33589 it that is not a declaration of it. */
33591 static void
33595 {
33601 {
33605 type))
33609 }
33614 /* Only consider the true class-keys below and ignore typename_type,
33615 etc. that are not C++ class-keys. */
33622 }
33624 /* Returns the template or specialization of one to which the RECORD_TYPE
33625 TYPE corresponds. */
33627 static tree
33629 {
33632 /* Determine the template or its partial specialization to which TYPE
33633 corresponds. */
33642 }
33645 /* Adds the class TYPE to the collection of class decls and diagnoses
33646 redundant tags (if -Wredundant-tags is enabled).
33647 DEF_P is expected to be set for a definition of class TYPE. DECL_P
33648 is set for a (likely, based on syntactic context) declaration of class
33649 TYPE and clear for a reference to it that is not a declaration of it. */
33651 void
33654 {
33657 /* Look up the NAME to see if it unambiguously refers to the TYPE
33658 and set KEY_REDUNDANT if so. */
33663 /* The class-key is redundant for uses of the CLASS_TYPE that are
33664 neither definitions of it nor declarations, and for which name
33665 lookup returns just the type itself. */
33676 {
33677 /* Avoid issuing the diagnostic for apparently redundant struct
33678 and union class-keys in shared C/C++ code in files (such as
33679 headers) included in the main source file. */
33682 LRK_MACRO_DEFINITION_LOCATION,
33686 }
33688 /* Set if a declaration of TYPE has previously been seen or if it must
33689 exist in a precompiled header. */
33693 {
33696 {
33697 /* TYPE_DECL is the first declaration or definition of the type
33698 (outside precompiled headers -- see below). Just create
33699 a new entry for it and return unless it's a declaration
33700 involving a template that may need to be diagnosed by
33701 -Wredundant-tags. */
33705 }
33706 else
33707 {
33708 /* TYPE was previously defined in some unknown precompiled header.
33709 Simply add a record of its definition at an unknown location and
33710 proceed below to add a reference to it at the current location.
33711 (Declarations in precompiled headers that are not definitions
33712 are ignored.) */
33713 tag_types def_key
33718 }
33719 }
33721 /* A prior declaration of TYPE_DECL has been seen. */
33724 {
33731 type);
33732 }
33735 /* Do nothing if this is the first declaration of the type. */
33739 /* Do nothing if the class-key in this declaration matches
33740 the definition. */
33744 def_p);
33745 }
33747 /* Either adds this DECL corresponding to the TYPE_DECL to the collection
33748 of class decls or diagnoses it, whichever is appropriate. */
33750 void
33752 tag_types class_key,
33755 {
33756 /* Reset the CLASS_KEY associated with this type on mismatch.
33757 This is an optimization that lets the diagnostic code skip
33758 over classes that use the same class-key in all declarations. */
33762 /* Set IDXDEF to the index of the vector corresponding to
33763 the definition. */
33767 /* Append a record of this declaration to the vector. */
33769 redundant);
33775 /* As a space optimization diagnose declarations of a class
33776 whose definition has been seen and purge the LOCVEC of
33777 all entries except the definition. */
33780 {
33786 }
33787 else
33788 /* Pop the entry pushed above for this declaration. */
33790 }
33792 /* Issues -Wmismatched-tags for a single class. */
33794 void
33796 {
33800 /* Number of uses of the class. */
33803 /* The class (or template) declaration guiding the decisions about
33804 the diagnostic. For ordinary classes it's the same as THIS. For
33805 uses of instantiations of templates other than their declarations
33806 it points to the record for the declaration of the corresponding
33807 primary template or partial specialization. */
33812 {
33813 /* For implicit instantiations of a primary template look up
33814 the primary or partial specialization and use it as
33815 the expected class-key rather than using the class-key of
33816 the first reference to the instantiation. The primary must
33817 be (and inevitably is) at index zero. */
33821 }
33822 else
33823 {
33824 /* Skip declarations that consistently use the same class-key. */
33827 }
33829 /* Set if a definition for the class has been seen. */
33832 /* The index of the declaration whose class-key this declaration
33833 is expected to match. It's either the class-key of the class
33834 definition if one exists or the first declaration otherwise. */
33837 /* The class-key the class is expected to be declared with: it's
33838 either the key used in its definition or the first declaration
33839 if no definition has been provided.
33840 For implicit instantiations of a primary template it's
33841 the class-key used to declare the primary with. The primary
33842 must be at index zero. */
33846 /* Advance IDX to the first declaration that either is not
33847 a definition or that doesn't match the first declaration
33848 if no definition is provided. */
33853 /* Save the current function before changing it below. */
33855 /* Set the function declaration to print in diagnostic context. */
33863 auto_diagnostic_group d;
33864 /* Issue a warning for the first mismatched declaration.
33865 Avoid using "%#qT" since the class-key for the same type will
33866 be the same regardless of which one was used in the declaraion. */
33870 {
33871 /* Suggest how to avoid the warning for each instance since
33872 the guidance may be different depending on context. */
33874 (key_redundant_p
33877 xpectkstr);
33879 /* Also point to the first declaration or definition that guided
33880 the decision to issue the warning above. */
33882 (def_p
33886 }
33888 /* Issue warnings for the remaining inconsistent declarations. */
33890 {
33892 /* Skip over the declarations that match either the definition
33893 if one was provided or the first declaration. */
33899 /* Set the function declaration to print in diagnostic context. */
33904 /* Suggest how to avoid the warning for each instance since
33905 the guidance may be different depending on context. */
33907 (key_redundant_p
33910 xpectkstr);
33911 }
33913 /* Restore the current function in case it was replaced above. */
33915 }
33917 /* Issues -Wmismatched-tags for all classes. Called at the end
33918 of processing a translation unit, after declarations of all class
33919 types and their uses have been recorded. */
33921 void
33923 {
33924 /* CLASS2LOC should be empty if both -Wmismatched-tags and
33925 -Wredundant-tags are disabled. */
33927 || warn_redundant_tags
33930 /* Save the current function before changing on return. It should
33931 be null at this point. */
33935 {
33936 /* Iterate over the collected class/struct/template declarations. */
33939 {
33943 }
33944 }
33947 }
33949 /* Issue an error message if DECL is redeclared with different
33950 access than its original declaration [class.access.spec/3].
33951 This applies to nested classes, nested class templates and
33952 enumerations [class.mem/1]. */
33954 static void
33956 {
33967 }
33969 /* Look for the `template' keyword, as a syntactic disambiguator.
33970 Return TRUE iff it is present, in which case it will be
33971 consumed. */
33973 static bool
33975 {
33977 {
33978 /* In C++98 the `template' keyword can only be used within templates;
33979 outside templates the parser can always figure out what is a
33980 template and what is not. In C++11, per the resolution of DR 468,
33981 `template' is allowed in cases where it is not strictly necessary. */
33984 {
33987 "in C++98 %<template%> (as a disambiguator) is only "
33989 /* If this part of the token stream is rescanned, the same
33990 error message would be generated. So, we purge the token
33991 from the stream. */
33994 }
33995 else
33996 {
33997 /* Consume the `template' keyword. */
34000 }
34001 }
34003 }
34005 /* The next token is a CPP_NESTED_NAME_SPECIFIER. Consume the token,
34006 set PARSER->SCOPE, and perform other related actions. */
34008 static void
34010 {
34013 /* Get the stored value. */
34015 /* Set the scope from the stored value. */
34020 }
34022 /* Consume tokens up through a non-nested END token. Returns TRUE if we
34023 encounter the end of a block before what we were looking for. */
34025 static bool
34029 {
34031 {
34034 /* Abort a parenthesized expression if we encounter a semicolon. */
34038 /* If we've reached the end of the file, stop. */
34044 /* We've hit the end of an enclosing block, so there's been some
34045 kind of syntax error. */
34048 /* Consume the token. */
34050 /* See if it starts a new group. */
34052 {
34054 /* In theory this should probably check end == '}', but
34055 cp_parser_save_member_function_body needs it to exit
34056 after either '}' or ')' when called with ')'. */
34059 }
34061 {
34065 }
34070 }
34071 }
34073 /* Like above, for caching a default argument or NSDMI. Both of these are
34074 terminated by a non-nested comma, but it can be unclear whether or not a
34075 comma is nested in a template argument list unless we do more parsing.
34076 In order to handle this ambiguity, when we encounter a ',' after a '<'
34077 we try to parse what follows as a parameter-declaration-list (in the
34078 case of a default argument) or a member-declarator (in the case of an
34079 NSDMI). If that succeeds, then we stop caching. */
34081 static tree
34083 {
34088 tree default_argument;
34090 /* Add tokens until we have processed the entire default
34091 argument. We add the range [first_token, token). */
34094 {
34095 /* For list-initialization, this is straightforward. */
34098 }
34100 {
34103 /* Peek at the next token. */
34105 /* What we do depends on what token we have. */
34107 {
34108 /* In valid code, a default argument must be
34109 immediately followed by a `,' `)', or `...'. */
34112 {
34113 /* If we've seen a '<', we might be in a
34114 template-argument-list. Until Core issue 325 is
34115 resolved, we don't know how this situation ought
34116 to be handled, so try to DTRT. We check whether
34117 what comes after the comma is a valid parameter
34118 declaration list. If it is, then the comma ends
34119 the default argument; otherwise the default
34120 argument continues. */
34124 /* Set ITALP so cp_parser_parameter_declaration_list
34125 doesn't decide to commit to this parse. */
34132 {
34133 /* Parse declarators until we reach a non-comma or
34134 somthing that cannot be an initializer.
34135 Just checking whether we're looking at a single
34136 declarator is insufficient. Consider:
34137 int var = tuple<T,U>::x;
34138 The template parameter 'U' looks exactly like a
34139 declarator. */
34140 do
34141 {
34145 CP_PARSER_FLAGS_NONE,
34154 }
34156 /* If we met an '=' or ';' then the original comma
34157 was the end of the NSDMI. Otherwise assume
34158 we're still in the NSDMI. */
34161 }
34162 else
34163 {
34166 tree t = cp_parser_parameter_declaration_list
34172 }
34179 }
34180 /* FALLTHRU */
34183 /* If we run into a non-nested `;', `}', or `]',
34184 then the code is invalid -- but the default
34185 argument is certainly over. */
34190 /* Handle correctly int n = sizeof ... ( p ); */
34193 /* Update DEPTH, if necessary. */
34208 /* This might be the comparison operator, or it might
34209 start a template argument list. */
34216 /* Fall through for C++0x, which treats the `>>'
34217 operator like two `>' tokens in certain
34218 cases. */
34223 {
34224 /* This might be an operator, or it might close a
34225 template argument list. But if a previous '<'
34226 started a template argument list, this will have
34227 closed it, so we can't be in one anymore. */
34231 }
34234 /* If we run out of tokens, issue an error message. */
34242 /* In these cases, we should look for template-ids.
34243 For example, if the default argument is
34244 `X<int, double>()', we need to do name lookup to
34245 figure out whether or not `X' is a template; if
34246 so, the `,' does not end the default argument.
34248 That is not yet done. */
34253 }
34255 /* If we've reached the end, stop. */
34259 /* Add the token to the token block. */
34261 }
34263 /* Create a DEFERRED_PARSE to represent the unparsed default
34264 argument. */
34271 }
34273 /* A location to use for diagnostics about an unparsed DEFERRED_PARSE. */
34275 location_t
34277 {
34282 }
34284 /* Begin parsing tentatively. We always save tokens while parsing
34285 tentatively so that if the tentative parsing fails we can restore the
34286 tokens. */
34288 static void
34290 {
34291 /* Enter a new parsing context. */
34293 /* Begin saving tokens. */
34295 /* In order to avoid repetitive access control error messages,
34296 access checks are queued up until we are no longer parsing
34297 tentatively. */
34299 }
34301 /* Commit to the currently active tentative parse. */
34303 static void
34305 {
34309 /* Mark all of the levels as committed. */
34312 {
34319 }
34320 }
34322 /* Commit to the topmost currently active tentative parse.
34324 Note that this function shouldn't be called when there are
34325 irreversible side-effects while in a tentative state. For
34326 example, we shouldn't create a permanent entry in the symbol
34327 table, or issue an error message that might not apply if the
34328 tentative parse is aborted. */
34330 static void
34332 {
34337 {
34345 }
34346 }
34348 /* Abort the currently active tentative parse. All consumed tokens
34349 will be rolled back, and no diagnostics will be issued. */
34351 static void
34353 {
34357 /* Now, pretend that we want to see if the construct was
34358 successfully parsed. */
34360 }
34362 /* Stop parsing tentatively. If a parse error has occurred, restore the
34363 token stream. Otherwise, commit to the tokens we have consumed.
34364 Returns true if no error occurred; false otherwise. */
34366 static bool
34368 {
34372 /* Remember whether or not an error occurred, since we are about to
34373 destroy that information. */
34375 /* Remove the topmost context from the stack. */
34378 /* If no parse errors occurred, commit to the tentative parse. */
34380 {
34381 /* Commit to the tokens read tentatively, unless that was
34382 already done. */
34387 }
34388 /* Otherwise, if errors occurred, roll back our state so that things
34389 are just as they were before we began the tentative parse. */
34390 else
34391 {
34394 }
34395 /* Add the context to the front of the free list. */
34400 }
34402 /* Returns true if we are parsing tentatively and are not committed to
34403 this tentative parse. */
34405 static bool
34407 {
34410 }
34412 /* Returns nonzero iff an error has occurred during the most recent
34413 tentative parse. */
34415 static bool
34417 {
34420 }
34422 /* Returns nonzero if GNU extensions are allowed. */
34424 static bool
34426 {
34428 }
34429 \f
34430 /* Objective-C++ Productions */
34433 /* Parse an Objective-C expression, which feeds into a primary-expression
34434 above.
34436 objc-expression:
34437 objc-message-expression
34438 objc-string-literal
34439 objc-encode-expression
34440 objc-protocol-expression
34441 objc-selector-expression
34443 Returns a tree representation of the expression. */
34445 static cp_expr
34447 {
34448 /* Try to figure out what kind of declaration is present. */
34452 {
34462 {
34474 }
34475 /* FALLTHRU */
34481 }
34484 }
34486 /* Parse an Objective-C message expression.
34488 objc-message-expression:
34489 [ objc-message-receiver objc-message-args ]
34491 Returns a representation of an Objective-C message. */
34493 static tree
34495 {
34508 /* Construct a location e.g.
34509 [self func1:5]
34510 ^~~~~~~~~~~~~~
34511 ranging from the '[' to the ']', with the caret at the start. */
34517 }
34519 /* Parse an objc-message-receiver.
34521 objc-message-receiver:
34522 expression
34523 simple-type-specifier
34525 Returns a representation of the type or expression. */
34527 static tree
34529 {
34530 tree rcv;
34532 /* An Objective-C message receiver may be either (1) a type
34533 or (2) an expression. */
34537 /* If that worked out, fine. */
34544 CP_PARSER_FLAGS_NONE);
34551 }
34553 /* Parse the arguments and selectors comprising an Objective-C message.
34555 objc-message-args:
34556 objc-selector
34557 objc-selector-args
34558 objc-selector-args , objc-comma-args
34560 objc-selector-args:
34561 objc-selector [opt] : assignment-expression
34562 objc-selector-args objc-selector [opt] : assignment-expression
34564 objc-comma-args:
34565 assignment-expression
34566 objc-comma-args , assignment-expression
34568 Returns a TREE_LIST, with TREE_PURPOSE containing a list of
34569 selector arguments and TREE_VALUE containing a list of comma
34570 arguments. */
34572 static tree
34574 {
34580 {
34586 /* Detect if we have a unary selector. */
34595 sel_args
34600 }
34602 /* Handle non-selector arguments, if any. */
34604 {
34605 tree arg;
34610 addl_args
34615 }
34618 {
34621 }
34624 }
34626 /* Parse an Objective-C encode expression.
34628 objc-encode-expression:
34629 @encode objc-typename
34631 Returns an encoded representation of the type argument. */
34633 static cp_expr
34635 {
34636 tree type;
34641 matching_parens parens;
34648 {
34652 }
34654 /* This happens if we find @encode(T) (where T is a template
34655 typename or something dependent on a template typename) when
34656 parsing a template. In that case, we can't compile it
34657 immediately, but we rather create an AT_ENCODE_EXPR which will
34658 need to be instantiated when the template is used.
34659 */
34661 {
34665 }
34668 /* Build a location of the form:
34669 @encode(int)
34670 ^~~~~~~~~~~~
34671 with caret==start at the @ token, finishing at the close paren. */
34675 }
34677 /* Parse an Objective-C @defs expression. */
34679 static tree
34681 {
34682 tree name;
34685 matching_parens parens;
34691 }
34693 /* Parse an Objective-C protocol expression.
34695 objc-protocol-expression:
34696 @protocol ( identifier )
34698 Returns a representation of the protocol expression. */
34700 static tree
34702 {
34703 tree proto;
34707 matching_parens parens;
34712 /* Build a location of the form:
34713 @protocol(prot)
34714 ^~~~~~~~~~~~~~~
34715 with caret==start at the @ token, finishing at the close paren. */
34720 }
34722 /* Parse an Objective-C selector expression.
34724 objc-selector-expression:
34725 @selector ( objc-method-signature )
34727 objc-method-signature:
34728 objc-selector
34729 objc-selector-seq
34731 objc-selector-seq:
34732 objc-selector :
34733 objc-selector-seq objc-selector :
34735 Returns a representation of the method selector. */
34737 static tree
34739 {
34746 matching_parens parens;
34752 {
34761 {
34762 /* Detect if we have a unary selector. */
34764 {
34767 }
34768 else
34769 {
34771 }
34772 }
34777 {
34778 sel_seq
34781 sel_seq
34784 }
34785 else
34786 sel_seq
34791 }
34793 finish_selector:
34797 /* Build a location of the form:
34798 @selector(func)
34799 ^~~~~~~~~~~~~~~
34800 with caret==start at the @ token, finishing at the close paren. */
34803 /* TODO: objc_build_selector_expr doesn't always honor the location. */
34806 }
34808 /* Parse a list of identifiers.
34810 objc-identifier-list:
34811 identifier
34812 objc-identifier-list , identifier
34814 Returns a TREE_LIST of identifier nodes. */
34816 static tree
34818 {
34819 tree identifier;
34820 tree list;
34831 {
34838 identifier));
34840 }
34843 }
34845 /* Parse an Objective-C alias declaration.
34847 objc-alias-declaration:
34848 @compatibility_alias identifier identifier ;
34850 This function registers the alias mapping with the Objective-C front end.
34851 It returns nothing. */
34853 static void
34855 {
34863 }
34865 /* Parse an Objective-C class forward-declaration.
34867 objc-class-declaration:
34868 @class objc-identifier-list ;
34870 The function registers the forward declarations with the Objective-C
34871 front end. It returns nothing. */
34873 static void
34875 {
34878 {
34879 tree id;
34889 else
34891 }
34893 }
34895 /* Parse a list of Objective-C protocol references.
34897 objc-protocol-refs-opt:
34898 objc-protocol-refs [opt]
34900 objc-protocol-refs:
34901 < objc-identifier-list >
34903 Returns a TREE_LIST of identifiers, if any. */
34905 static tree
34907 {
34911 {
34915 }
34918 }
34920 /* Parse a Objective-C visibility specification. */
34922 static void
34924 {
34928 {
34943 }
34945 /* Eat '@private'/'@protected'/'@public'. */
34947 }
34949 /* Parse an Objective-C method type. Return 'true' if it is a class
34950 (+) method, and 'false' if it is an instance (-) method. */
34954 {
34957 else
34959 }
34961 /* Parse an Objective-C protocol qualifier. */
34963 static tree
34965 {
34978 {
34983 }
34986 }
34988 /* Parse an Objective-C typename. */
34990 static tree
34992 {
34996 {
34999 matching_parens parens;
35003 /* An ObjC type name may consist of just protocol qualifiers, in which
35004 case the type shall default to 'id'. */
35006 {
35009 /* If the type could not be parsed, an error has already
35010 been produced. For error recovery, behave as if it had
35011 not been specified, which will use the default type
35012 'id'. */
35014 {
35016 /* We need to skip to the closing parenthesis as
35017 cp_parser_type_id() does not seem to do it for
35018 us. */
35023 }
35024 }
35028 }
35031 }
35033 /* Check to see if TYPE refers to an Objective-C selector name. */
35035 static bool
35037 {
35043 }
35045 /* Parse an Objective-C selector. */
35047 static tree
35049 {
35053 {
35056 }
35058 /* C++ operator names are allowed to appear in ObjC selectors. */
35060 {
35073 }
35074 }
35076 /* Parse an Objective-C params list. */
35078 static tree
35080 {
35086 {
35096 /* Detect if we have a unary selector. */
35099 {
35102 }
35106 {
35107 /* Something went quite wrong. There should be a colon
35108 here, but there is not. Stop parsing parameters. */
35110 }
35112 /* New ObjC allows attributes on parameters too. */
35117 params
35120 type_name,
35121 identifier,
35122 parm_attr));
35125 }
35128 {
35131 }
35133 /* We allow tail attributes for the method. */
35135 {
35143 }
35146 {
35149 }
35151 }
35153 /* Parse the non-keyword Objective-C params. */
35155 static tree
35158 {
35164 {
35166 tree parm;
35172 {
35177 }
35179 /* TODO: parse attributes for tail parameters. */
35189 }
35191 /* We allow tail attributes for the method. */
35193 {
35195 {
35200 }
35201 else
35202 /* We have an error, but parse the attributes, so that we can
35203 carry on. */
35209 }
35212 }
35214 /* Parse a linkage specification, a pragma, an extra semicolon or a block. */
35216 static void
35218 {
35221 /* If the next token is `extern' and the following token is a string
35222 literal, then we have a linkage specification. */
35224 && cp_parser_is_pure_string_literal
35227 /* Handle #pragma, if any. */
35230 /* Allow stray semicolons. */
35233 /* Mark methods as optional or required, when building protocols. */
35235 {
35238 }
35240 {
35243 }
35246 /* Other stray characters must generate errors. */
35248 {
35252 }
35253 /* Finally, try to parse a block-declaration, or a function-definition. */
35254 else
35256 }
35258 /* Parse a method signature. */
35260 static tree
35262 {
35278 }
35280 static bool
35282 {
35283 tree tattr;
35288 /* If the attributes are followed by a method introducer, this is not allowed.
35289 Dump the attributes and flag the situation. */
35294 /* Otherwise, the attributes introduce some interstitial code, possibly so
35295 rewind to allow that check. */
35298 }
35300 /* Parse an Objective-C method prototype list. */
35302 static void
35304 {
35308 {
35310 {
35315 else
35319 {
35323 }
35326 }
35332 OPT_Wattributes,
35334 else
35335 /* Allow for interspersed non-ObjC++ code. */
35339 }
35343 else
35347 }
35349 /* Parse an Objective-C method definition list. */
35351 static void
35353 {
35355 {
35359 {
35362 }
35364 {
35367 }
35369 {
35373 tree attribute;
35377 else
35378 {
35382 /* For historical reasons, we accept an optional semicolon. */
35388 tree meth
35392 }
35393 }
35394 /* The following case will be removed once @synthesize is
35395 completely implemented. */
35406 else
35407 /* Allow for interspersed non-ObjC++ code. */
35409 }
35412 }
35414 /* Parse Objective-C ivars. */
35416 static void
35418 {
35429 {
35430 cp_decl_specifier_seq declspecs;
35432 tree prefix_attributes;
35440 CP_PARSER_FLAGS_OPTIONAL,
35444 /* auto, register, static, extern, mutable. */
35446 {
35449 }
35451 /* thread_local. */
35453 {
35456 }
35458 /* typedef. */
35460 {
35463 }
35468 /* Keep going until we hit the `;' at the end of the
35469 declaration. */
35471 {
35476 /* Check for a (possibly unnamed) bitfield declaration. */
35484 {
35485 /* Get the name of the bitfield. */
35490 eat_colon:
35492 /* Get the width of the bitfield. */
35493 width
35495 }
35496 else
35497 {
35498 /* Parse the declarator. */
35499 declarator
35501 CP_PARSER_FLAGS_NONE,
35507 }
35509 /* Look for attributes that apply to the ivar. */
35511 /* Remember which attributes are prefix attributes and
35512 which are not. */
35514 /* Combine the attributes. */
35518 /* Create the bitfield declaration. */
35521 else
35526 /* Add the instance variable. */
35530 /* Reset PREFIX_ATTRIBUTES. */
35532 {
35537 }
35542 {
35545 }
35547 }
35551 }
35556 /* Do not consume the RID_AT_END, so it will be read again as terminating
35557 the @interface of @implementation. */
35561 /* For historical reasons, we accept an optional semicolon. */
35564 }
35566 /* Parse an Objective-C protocol declaration. */
35568 static void
35570 {
35576 {
35581 }
35583 /* See if we have a forward declaration or a definition. */
35586 /* Try a forward declaration first. */
35588 {
35590 {
35591 tree id;
35601 else
35603 }
35605 }
35607 /* Ok, we got a full-fledged definition (or at least should). */
35608 else
35609 {
35614 }
35615 }
35617 /* Parse an Objective-C superclass or category. */
35619 static void
35624 {
35630 {
35633 }
35635 {
35636 matching_parens parens;
35639 /* If there is no category name, and this is an @interface, we
35640 have a class extension. */
35642 {
35645 }
35646 else
35650 }
35651 }
35653 /* Parse an Objective-C class interface. */
35655 static void
35657 {
35665 {
35666 /* It's hard to recover because even if valid @interface stuff
35667 is to follow, we can't compile it (or validate it) if we
35668 don't even know which class it refers to. Let's assume this
35669 was a stray '@interface' token in the stream and skip it.
35670 */
35672 }
35677 /* We have either a class or a category on our hands. */
35680 else
35681 {
35683 /* Handle instance variable declarations, if any. */
35686 }
35689 }
35691 /* Parse an Objective-C class implementation. */
35693 static void
35695 {
35702 {
35703 /* It's hard to recover because even if valid @implementation
35704 stuff is to follow, we can't compile it (or validate it) if
35705 we don't even know which class it refers to. Let's assume
35706 this was a stray '@implementation' token in the stream and
35707 skip it.
35708 */
35710 }
35714 /* We have either a class or a category on our hands. */
35717 else
35718 {
35720 /* Handle instance variable declarations, if any. */
35723 }
35726 }
35728 /* Consume the @end token and finish off the implementation. */
35730 static void
35732 {
35735 }
35737 /* Parse an Objective-C declaration. */
35739 static void
35741 {
35742 /* Try to figure out what kind of declaration is present. */
35747 {
35763 }
35766 {
35789 }
35790 }
35792 /* Parse an Objective-C try-catch-finally statement.
35794 objc-try-catch-finally-stmt:
35795 @try compound-statement objc-catch-clause-seq [opt]
35796 objc-finally-clause [opt]
35798 objc-catch-clause-seq:
35799 objc-catch-clause objc-catch-clause-seq [opt]
35801 objc-catch-clause:
35802 @catch ( objc-exception-declaration ) compound-statement
35804 objc-finally-clause:
35805 @finally compound-statement
35807 objc-exception-declaration:
35808 parameter-declaration
35809 '...'
35811 where '...' is to be interpreted literally, that is, it means CPP_ELLIPSIS.
35813 Returns NULL_TREE.
35815 PS: This function is identical to c_parser_objc_try_catch_finally_statement
35816 for C. Keep them in sync. */
35818 static tree
35820 {
35821 location_t location;
35822 tree stmt;
35827 /* NB: The @try block needs to be wrapped in its own STATEMENT_LIST
35828 node, lest it get absorbed into the surrounding block. */
35834 {
35838 matching_parens parens;
35844 {
35845 /* We have "@catch (...)" (where the '...' are literally
35846 what is in the code). Skip the '...'.
35847 parameter_declaration is set to NULL_TREE, and
35848 objc_being_catch_clauses() knows that that means
35849 '...'. */
35852 }
35853 else
35854 {
35855 /* We have "@catch (NSException *exception)" or something
35856 like that. Parse the parameter declaration. */
35861 else
35866 }
35869 else
35870 {
35871 /* If there was no open parenthesis, we are recovering from
35872 an error, and we are trying to figure out what mistake
35873 the user has made. */
35875 /* If there is an immediate closing parenthesis, the user
35876 probably forgot the opening one (ie, they typed "@catch
35877 NSException *e)". Parse the closing parenthesis and keep
35878 going. */
35882 /* If these is no immediate closing parenthesis, the user
35883 probably doesn't know that parenthesis are required at
35884 all (ie, they typed "@catch NSException *e"). So, just
35885 forget about the closing parenthesis and keep going. */
35886 }
35890 }
35892 {
35895 /* NB: The @finally block needs to be wrapped in its own STATEMENT_LIST
35896 node, lest it get absorbed into the surrounding block. */
35900 }
35903 }
35905 /* Parse an Objective-C synchronized statement.
35907 objc-synchronized-stmt:
35908 @synchronized ( expression ) compound-statement
35910 Returns NULL_TREE. */
35912 static tree
35914 {
35915 location_t location;
35922 matching_parens parens;
35927 /* NB: The @synchronized block needs to be wrapped in its own STATEMENT_LIST
35928 node, lest it get absorbed into the surrounding block. */
35933 }
35935 /* Parse an Objective-C throw statement.
35937 objc-throw-stmt:
35938 @throw assignment-expression [opt] ;
35940 Returns a constructed '@throw' statement. */
35942 static tree
35944 {
35956 }
35958 /* Parse an Objective-C statement. */
35960 static tree
35962 {
35963 /* Try to figure out what kind of declaration is present. */
35967 {
35978 }
35981 }
35983 /* If we are compiling ObjC++ and we see an __attribute__ we neeed to
35984 look ahead to see if an objc keyword follows the attributes. This
35985 is to detect the use of prefix attributes on ObjC @interface and
35986 @protocol. */
35988 static bool
35990 {
35995 {
35999 else
36002 }
36005 }
36007 /* This routine is a minimal replacement for
36008 c_parser_struct_declaration () used when parsing the list of
36009 types/names or ObjC++ properties. For example, when parsing the
36010 code
36012 @property (readonly) int a, b, c;
36014 this function is responsible for parsing "int a, int b, int c" and
36015 returning the declarations as CHAIN of DECLs.
36017 TODO: Share this code with cp_parser_objc_class_ivars. It's very
36018 similar parsing. */
36019 static tree
36021 {
36023 cp_decl_specifier_seq declspecs;
36025 tree prefix_attributes;
36028 CP_PARSER_FLAGS_NONE,
36035 /* auto, register, static, extern, mutable. */
36037 {
36040 }
36042 /* thread_local. */
36044 {
36047 }
36049 /* typedef. */
36051 {
36054 }
36059 /* Keep going until we hit the `;' at the end of the declaration. */
36061 {
36066 /* Parse the declarator. */
36068 CP_PARSER_FLAGS_NONE,
36071 /* Look for attributes that apply to the ivar. */
36073 /* Remember which attributes are prefix attributes and
36074 which are not. */
36076 /* Combine the attributes. */
36086 /* Reset PREFIX_ATTRIBUTES. */
36088 {
36093 }
36100 {
36103 }
36104 else
36106 }
36108 }
36110 /* Parse an Objective-C @property declaration. The syntax is:
36112 objc-property-declaration:
36113 '@property' objc-property-attributes[opt] struct-declaration ;
36115 objc-property-attributes:
36116 '(' objc-property-attribute-list ')'
36118 objc-property-attribute-list:
36119 objc-property-attribute
36120 objc-property-attribute-list, objc-property-attribute
36122 objc-property-attribute
36123 'getter' = identifier
36124 'setter' = identifier
36125 'readonly'
36126 'readwrite'
36127 'assign'
36128 'retain'
36129 'copy'
36130 'nonatomic'
36132 For example:
36133 @property NSString *name;
36134 @property (readonly) id object;
36135 @property (retain, nonatomic, getter=getTheName) id name;
36136 @property int a, b, c;
36138 PS: This function is identical to
36139 c_parser_objc_at_property_declaration for C. Keep them in sync. */
36140 static void
36142 {
36143 /* Parse the optional attribute list.
36145 A list of parsed, but not verified, attributes. */
36151 /* Parse the optional attribute list... */
36153 {
36154 /* Eat the '('. */
36155 matching_parens parens;
36160 /* Allow empty @property attribute lists, but with a warning. */
36162 location_t attr_comb;
36164 {
36168 }
36169 else
36171 {
36178 {
36185 }
36196 /* Account for accepting the 'class' keyword in this context. */
36198 else
36202 enum objc_property_attribute_kind prop_kind
36204 property_attribute_info *prop
36208 tree meth_name;
36210 {
36215 attr_name);
36216 else
36224 {
36227 attr_name);
36230 }
36238 {
36241 attr_name);
36244 }
36246 /* Get the end of the method name, and consume the name. */
36249 /* Because method names may contain C++ keywords, we have a
36250 routine to fetch them (this also consumes the token). */
36254 {
36256 {
36258 attr_end);
36262 }
36263 else
36264 {
36268 }
36270 attr_end);
36271 }
36272 else
36274 attr_end);
36276 /* Updated location including all that was successfully
36277 parsed. */
36280 }
36282 /* If we see a comma here, then keep going - even if we already
36283 saw a syntax error. For simple mistakes e.g. (asign, getter=x)
36284 this makes a more useful output and avoid spurious warnings
36285 about missing attributes that are, in fact, specified after the
36286 one with the syntax error. */
36289 else
36291 }
36297 }
36299 /* 'properties' is the list of properties that we read. Usually a
36300 single one, but maybe more (eg, in "@property int a, b, c;" there
36301 are three).
36302 TODO: Update this parsing so that it accepts (erroneous) bitfields so
36303 that we can issue a meaningful and consistent (between C/C++) error
36304 message from objc_add_property_declaration (). */
36311 else
36312 {
36313 /* Comma-separated properties are chained together in reverse order;
36314 add them one by one. */
36318 prop_attr_list);
36319 }
36322 }
36324 /* Parse an Objective-C++ @synthesize declaration. The syntax is:
36326 objc-synthesize-declaration:
36327 @synthesize objc-synthesize-identifier-list ;
36329 objc-synthesize-identifier-list:
36330 objc-synthesize-identifier
36331 objc-synthesize-identifier-list, objc-synthesize-identifier
36333 objc-synthesize-identifier
36334 identifier
36335 identifier = identifier
36337 For example:
36338 @synthesize MyProperty;
36339 @synthesize OneProperty, AnotherProperty=MyIvar, YetAnotherProperty;
36341 PS: This function is identical to c_parser_objc_at_synthesize_declaration
36342 for C. Keep them in sync.
36343 */
36344 static void
36346 {
36348 location_t loc;
36353 {
36357 {
36360 }
36362 {
36366 {
36369 }
36370 }
36371 else
36376 else
36378 }
36381 }
36383 /* Parse an Objective-C++ @dynamic declaration. The syntax is:
36385 objc-dynamic-declaration:
36386 @dynamic identifier-list ;
36388 For example:
36389 @dynamic MyProperty;
36390 @dynamic MyProperty, AnotherProperty;
36392 PS: This function is identical to c_parser_objc_at_dynamic_declaration
36393 for C. Keep them in sync.
36394 */
36395 static void
36397 {
36399 location_t loc;
36404 {
36405 tree property;
36408 {
36411 }
36415 else
36417 }
36420 }
36422 \f
36423 /* OpenMP 2.5 / 3.0 / 3.1 / 4.0 / 4.5 / 5.0 parsing routines. */
36425 /* Returns name of the next clause.
36426 If the clause is not recognized PRAGMA_OMP_CLAUSE_NONE is returned and
36427 the token is not consumed. Otherwise appropriate pragma_omp_clause is
36428 returned and the token is consumed. */
36430 static pragma_omp_clause
36432 {
36448 {
36453 {
36670 }
36671 }
36677 }
36679 /* Validate that a clause of the given type does not already exist. */
36681 static void
36684 {
36687 }
36689 /* OpenMP 2.5:
36690 variable-list:
36691 identifier
36692 variable-list , identifier
36694 In addition, we match a closing parenthesis (or, if COLON is non-NULL,
36695 colon). An opening parenthesis will have been consumed by the caller.
36697 If KIND is nonzero, create the appropriate node and install the decl
36698 in OMP_CLAUSE_DECL and add the node to the head of the list.
36700 If KIND is zero, create a TREE_LIST with the decl in TREE_PURPOSE;
36701 return the list created.
36703 COLON can be NULL if only closing parenthesis should end the list,
36704 or pointer to bool which will receive false if the list is terminated
36705 by closing parenthesis or true if the list is terminated by colon.
36707 The optional ALLOW_DEREF argument is true if list items can use the deref
36708 (->) operator. */
36710 struct omp_dim
36711 {
36713 location_t loc;
36717 };
36719 static tree
36723 {
36729 {
36732 }
36734 {
36742 {
36748 }
36752 {
36753 cp_id_kind idk;
36756 }
36761 CPP_CLOSE_PAREN)))
36762 {
36765 }
36766 else
36767 {
36774 {
36779 }
36783 else
36786 {
36792 }
36793 }
36797 ;
36799 {
36801 {
36803 /* The OpenACC cache directive explicitly only allows "array
36804 elements or subarrays". */
36806 {
36810 }
36811 /* FALLTHROUGH. */
36815 start_component_ref:
36817 || (allow_deref
36819 {
36820 cpp_ttype ttype
36823 location_t loc
36828 decl
36832 }
36833 /* FALLTHROUGH. */
36843 {
36851 {
36854 /* Later handling is not prepared to see through these. */
36856 }
36858 parser->colon_corrects_to_scope_p
36861 {
36864 }
36865 else
36866 {
36867 /* Look for `:'. */
36869 {
36874 }
36877 else
36880 CPP_CLOSE_SQUARE))
36881 {
36883 /* Later handling is not prepared to see through these. */
36885 }
36886 }
36887 /* Look for the closing `]'. */
36889 RT_CLOSE_SQUARE))
36890 {
36895 }
36898 }
36903 && !array_section_p
36905 || (allow_deref
36907 CPP_DEREF))))
36908 {
36910 {
36914 }
36916 }
36917 else
36924 }
36927 {
36931 {
36932 depend_lvalue:
36936 }
36937 else
36939 }
36945 }
36946 else
36949 get_comma:
36953 }
36959 {
36963 }
36966 {
36969 /* Try to resync to an unnested comma. Copied from
36970 cp_parser_parenthesized_expression_list. */
36971 skip_comma:
36980 }
36983 }
36985 /* Similarly, but expect leading and trailing parenthesis. This is a very
36986 common case for omp clauses. */
36988 static tree
36991 {
36994 allow_deref);
36996 }
36998 /* OpenACC 2.0:
36999 copy ( variable-list )
37000 copyin ( variable-list )
37001 copyout ( variable-list )
37002 create ( variable-list )
37003 delete ( variable-list )
37004 present ( variable-list )
37006 OpenACC 2.6:
37007 no_create ( variable-list )
37008 attach ( variable-list )
37009 detach ( variable-list ) */
37011 static tree
37013 tree list)
37014 {
37017 {
37059 }
37067 }
37069 /* OpenACC 2.0:
37070 deviceptr ( variable-list ) */
37072 static tree
37074 {
37078 /* Can't use OMP_CLAUSE_MAP here (that is, can't use the generic
37079 cp_parser_oacc_data_clause), as for PRAGMA_OACC_CLAUSE_DEVICEPTR,
37080 variable-list must only allow for pointer variables. */
37083 {
37090 }
37093 }
37095 /* OpenACC 2.5:
37096 auto
37097 finalize
37098 independent
37099 nohost
37100 seq */
37102 static tree
37104 tree list)
37105 {
37112 }
37114 /* OpenACC:
37115 num_gangs ( expression )
37116 num_workers ( expression )
37117 vector_length ( expression ) */
37119 static tree
37122 {
37125 matching_parens parens;
37133 {
37138 }
37146 }
37148 /* OpenACC:
37150 gang [( gang-arg-list )]
37151 worker [( [num:] int-expr )]
37152 vector [( [length:] int-expr )]
37154 where gang-arg is one of:
37156 [num:] int-expr
37157 static: size-expr
37159 and size-expr may be:
37161 *
37162 int-expr
37163 */
37165 static tree
37167 omp_clause_code kind,
37169 {
37178 {
37179 matching_parens parens;
37182 do
37183 {
37187 /* Gang static argument. */
37190 {
37198 {
37201 }
37203 /* Check for the '*' argument. */
37207 CPP_CLOSE_PAREN)))
37208 {
37213 {
37216 }
37218 }
37219 }
37220 /* Worker num: argument and vector length: arguments. */
37224 {
37227 }
37229 /* Now collect the actual argument. */
37231 {
37234 }
37246 {
37249 }
37251 }
37256 }
37270 cleanup_error:
37273 }
37275 /* OpenACC 2.0:
37276 tile ( size-expr-list ) */
37278 static tree
37280 {
37284 /* Collapse and tile are mutually exclusive. (The spec doesn't say
37285 so, but the spec authors never considered such a case and have
37286 differing opinions on what it might mean, including 'not
37287 allowed'.) */
37290 clause_loc);
37295 do
37296 {
37303 {
37306 }
37307 else
37311 }
37314 /* Consume the trailing ')'. */
37322 }
37324 /* OpenACC 2.0
37325 Parse wait clause or directive parameters. */
37327 static tree
37329 {
37339 {
37341 {
37344 }
37346 }
37353 {
37357 {
37360 else
37361 {
37368 }
37369 }
37370 }
37373 }
37375 /* OpenACC:
37376 wait [( int-expr-list )] */
37378 static tree
37380 {
37385 else
37386 {
37392 }
37395 }
37397 /* OpenMP 3.0:
37398 collapse ( constant-expression ) */
37400 static tree
37402 {
37404 location_t loc;
37405 HOST_WIDE_INT n;
37408 matching_parens parens;
37426 {
37429 }
37438 }
37440 /* OpenMP 2.5:
37441 default ( none | shared )
37443 OpenMP 5.1:
37444 default ( private | firstprivate )
37446 OpenACC:
37447 default ( none | present ) */
37449 static tree
37452 {
37454 tree c;
37456 matching_parens parens;
37460 {
37463 }
37465 {
37470 {
37497 }
37500 }
37501 else
37502 {
37503 invalid_kind:
37506 else
37509 }
37526 }
37528 /* OpenMP 3.1:
37529 final ( expression ) */
37531 static tree
37533 {
37536 matching_parens parens;
37555 }
37557 /* OpenMP 2.5:
37558 if ( expression )
37560 OpenMP 4.5:
37561 if ( directive-name-modifier : expression )
37563 directive-name-modifier:
37564 parallel | task | taskloop | target data | target | target update
37565 | target enter data | target exit data
37567 OpenMP 5.0:
37568 directive-name-modifier:
37569 ... | simd | cancel */
37571 static tree
37574 {
37578 matching_parens parens;
37583 {
37599 {
37602 {
37615 else
37616 {
37617 location_t loc
37622 }
37625 {
37627 {
37632 }
37634 {
37635 location_t loc
37639 }
37640 }
37641 }
37642 }
37644 {
37646 {
37649 }
37650 else
37651 {
37653 {
37654 location_t loc
37657 }
37659 }
37660 }
37661 }
37673 {
37676 {
37679 {
37691 }
37693 p);
37695 }
37697 {
37700 else
37703 }
37706 {
37710 }
37711 }
37719 }
37721 /* OpenMP 3.1:
37722 mergeable */
37724 static tree
37727 {
37728 tree c;
37731 location);
37736 }
37738 /* OpenMP 2.5:
37739 nowait */
37741 static tree
37744 {
37745 tree c;
37752 }
37754 /* OpenMP 2.5:
37755 num_threads ( expression ) */
37757 static tree
37759 location_t location)
37760 {
37763 matching_parens parens;
37783 }
37785 /* OpenMP 4.5:
37786 num_tasks ( expression )
37788 OpenMP 5.1:
37789 num_tasks ( strict : expression ) */
37791 static tree
37793 location_t location)
37794 {
37797 matching_parens parens;
37804 {
37807 {
37811 }
37812 }
37831 }
37833 /* OpenMP 4.5:
37834 grainsize ( expression )
37836 OpenMP 5.1:
37837 grainsize ( strict : expression ) */
37839 static tree
37841 location_t location)
37842 {
37845 matching_parens parens;
37852 {
37855 {
37859 }
37860 }
37879 }
37881 /* OpenMP 4.5:
37882 priority ( expression ) */
37884 static tree
37886 location_t location)
37887 {
37890 matching_parens parens;
37910 }
37912 /* OpenMP 4.5:
37913 hint ( expression ) */
37915 static tree
37917 {
37920 matching_parens parens;
37927 {
37935 }
37948 }
37950 /* OpenMP 5.1:
37951 filter ( integer-expression ) */
37953 static tree
37955 {
37958 matching_parens parens;
37976 }
37978 /* OpenMP 4.5:
37979 defaultmap ( tofrom : scalar )
37981 OpenMP 5.0:
37982 defaultmap ( implicit-behavior [ : variable-category ] ) */
37984 static tree
37986 location_t location)
37987 {
37991 enum omp_clause_defaultmap_kind category
37994 matching_parens parens;
38001 {
38002 invalid_behavior:
38004 "%<tofrom%>, %<firstprivate%>, %<none%> "
38007 }
38008 else
38009 {
38012 }
38015 {
38019 else
38026 else
38035 else
38042 else
38051 else
38057 }
38061 {
38066 {
38067 invalid_category:
38071 }
38076 {
38080 else
38087 else
38094 else
38100 }
38103 }
38113 {
38120 {
38135 }
38138 p);
38139 else
38143 }
38150 out_err:
38155 }
38157 /* OpenMP 5.0:
38158 order ( concurrent )
38160 OpenMP 5.1:
38161 order ( order-modifier : concurrent )
38163 order-modifier:
38164 reproducible
38165 unconstrained */
38167 static tree
38169 {
38175 matching_parens parens;
38181 {
38188 else
38189 {
38193 }
38196 }
38198 {
38201 }
38202 else
38203 {
38206 }
38208 {
38211 }
38223 out_err:
38228 }
38230 /* OpenMP 5.0:
38231 bind ( teams | parallel | thread ) */
38233 static tree
38235 location_t location)
38236 {
38237 tree c;
38241 matching_parens parens;
38246 {
38247 invalid:
38251 }
38252 else
38253 {
38256 }
38267 /* check_no_duplicate_clause (list, OMP_CLAUSE_BIND, "bind", location); */
38273 out_err:
38278 }
38280 /* OpenMP 2.5:
38281 ordered
38283 OpenMP 4.5:
38284 ordered ( constant-expression ) */
38286 static tree
38289 {
38291 HOST_WIDE_INT n;
38297 {
38298 matching_parens parens;
38315 {
38317 "ordered argument needs positive constant integer "
38320 }
38321 }
38327 }
38329 /* OpenMP 2.5:
38330 reduction ( reduction-operator : variable-list )
38332 reduction-operator:
38333 One of: + * - & ^ | && ||
38335 OpenMP 3.1:
38337 reduction-operator:
38338 One of: + * - & ^ | && || min max
38340 OpenMP 4.0:
38342 reduction-operator:
38343 One of: + * - & ^ | && ||
38344 id-expression
38346 OpenMP 5.0:
38347 reduction ( reduction-modifier, reduction-operator : variable-list )
38348 in_reduction ( reduction-operator : variable-list )
38349 task_reduction ( reduction-operator : variable-list ) */
38351 static tree
38354 {
38364 {
38367 {
38370 }
38373 {
38381 {
38384 }
38385 }
38386 }
38389 {
38399 }
38403 else
38404 {
38415 {
38445 }
38446 else
38447 {
38449 resync_fail:
38454 }
38455 }
38461 NULL);
38463 {
38470 }
38473 }
38475 /* OpenMP 2.5:
38476 schedule ( schedule-kind )
38477 schedule ( schedule-kind , expression )
38479 schedule-kind:
38480 static | dynamic | guided | runtime | auto
38482 OpenMP 4.5:
38483 schedule ( schedule-modifier : schedule-kind )
38484 schedule ( schedule-modifier [ , schedule-modifier ] : schedule-kind , expression )
38486 schedule-modifier:
38487 simd
38488 monotonic
38489 nonmonotonic */
38491 static tree
38493 {
38497 matching_parens parens;
38505 {
38514 else
38520 {
38523 }
38524 else
38525 {
38528 }
38529 }
38534 {
38539 {
38560 }
38561 }
38566 else
38572 == (OMP_CLAUSE_SCHEDULE_MONOTONIC
38574 {
38578 }
38581 {
38596 else
38601 }
38613 invalid_kind:
38615 resync_fail:
38620 }
38622 /* OpenMP 3.0:
38623 untied */
38625 static tree
38628 {
38629 tree c;
38636 }
38638 /* OpenMP 4.0:
38639 inbranch
38640 notinbranch */
38642 static tree
38645 {
38650 }
38652 /* OpenMP 4.0:
38653 parallel
38654 for
38655 sections
38656 taskgroup */
38658 static tree
38662 {
38666 }
38668 /* OpenMP 4.5:
38669 nogroup */
38671 static tree
38674 {
38679 }
38681 /* OpenMP 4.5:
38682 simd
38683 threads */
38685 static tree
38689 {
38694 }
38696 /* OpenMP 4.0:
38697 num_teams ( expression )
38699 OpenMP 5.1:
38700 num_teams ( expression : expression ) */
38702 static tree
38704 location_t location)
38705 {
38708 matching_parens parens;
38719 {
38723 }
38740 }
38742 /* OpenMP 4.0:
38743 thread_limit ( expression ) */
38745 static tree
38747 location_t location)
38748 {
38751 matching_parens parens;
38771 }
38773 /* OpenMP 4.0:
38774 aligned ( variable-list )
38775 aligned ( variable-list : constant-expression ) */
38777 static tree
38779 {
38783 matching_parens parens;
38791 {
38801 }
38807 }
38809 /* OpenMP 5.0:
38810 allocate ( variable-list )
38811 allocate ( expression : variable-list )
38813 OpenMP 5.1:
38814 allocate ( allocator-modifier : variable-list )
38815 allocate ( allocator-modifier , allocator-modifier : variable-list )
38817 allocator-modifier:
38818 allocator ( expression )
38819 align ( expression ) */
38821 static tree
38823 {
38827 matching_parens parens;
38837 {
38843 matching_parens parens2;
38847 {
38851 }
38852 else
38853 {
38857 }
38861 {
38864 }
38868 }
38869 else
38872 {
38878 }
38881 {
38888 }
38889 else
38890 {
38894 }
38901 {
38904 }
38907 }
38909 /* OpenMP 2.5:
38910 lastprivate ( variable-list )
38912 OpenMP 5.0:
38913 lastprivate ( [ lastprivate-modifier : ] variable-list ) */
38915 static tree
38917 {
38925 {
38930 {
38934 }
38935 }
38944 }
38946 /* OpenMP 4.0:
38947 linear ( variable-list )
38948 linear ( variable-list : expression )
38950 OpenMP 4.5:
38951 linear ( modifier ( variable-list ) )
38952 linear ( modifier ( variable-list ) : expression ) */
38954 static tree
38957 {
38962 matching_parens parens;
38967 {
38979 else
38981 }
38986 else
38987 {
38996 }
38999 {
39004 {
39015 {
39018 }
39021 }
39032 }
39035 {
39038 }
39041 }
39043 /* OpenMP 4.0:
39044 safelen ( constant-expression ) */
39046 static tree
39048 location_t location)
39049 {
39052 matching_parens parens;
39071 }
39073 /* OpenMP 4.0:
39074 simdlen ( constant-expression ) */
39076 static tree
39078 location_t location)
39079 {
39082 matching_parens parens;
39101 }
39103 /* OpenMP 4.5:
39104 vec:
39105 identifier [+/- integer]
39106 vec , identifier [+/- integer]
39107 */
39109 static tree
39111 tree list)
39112 {
39116 {
39119 }
39122 {
39129 else
39130 {
39131 t = cp_parser_lookup_name_simple
39136 id_loc);
39137 }
39143 {
39146 }
39150 {
39153 }
39157 {
39160 }
39163 add_to_vector:
39165 {
39169 }
39176 }
39179 {
39185 }
39187 }
39189 /* OpenMP 5.0:
39190 detach ( event-handle ) */
39192 static tree
39194 {
39195 matching_parens parens;
39211 else
39212 {
39215 else
39220 }
39233 }
39235 /* OpenMP 5.0:
39236 iterators ( iterators-definition )
39238 iterators-definition:
39239 iterator-specifier
39240 iterator-specifier , iterators-definition
39242 iterator-specifier:
39243 identifier = range-specification
39244 iterator-type identifier = range-specification
39246 range-specification:
39247 begin : end
39248 begin : end : step */
39250 static tree
39252 {
39256 matching_parens parens;
39260 bool saved_colon_corrects_to_scope_p
39262 bool saved_colon_doesnt_start_class_def_p
39265 do
39266 {
39267 tree iter_type;
39271 else
39272 {
39275 parser->type_definition_forbidden_message
39281 }
39285 {
39288 }
39308 {
39311 }
39326 {
39329 }
39331 }
39335 parser->colon_doesnt_start_class_def_p
39345 }
39347 /* OpenMP 5.0:
39348 affinity ( [aff-modifier :] variable-list )
39349 aff-modifier:
39350 iterator ( iterators-definition ) */
39352 static tree
39354 {
39357 matching_parens parens;
39362 {
39367 CPP_OPEN_PAREN)));
39369 {
39372 }
39374 {
39378 {
39386 }
39387 }
39388 }
39392 {
39395 {
39400 }
39401 }
39403 }
39405 /* OpenMP 4.0:
39406 depend ( depend-kind : variable-list )
39408 depend-kind:
39409 in | out | inout
39411 OpenMP 4.5:
39412 depend ( source )
39414 depend ( sink : vec )
39416 OpenMP 5.0:
39417 depend ( depend-modifier , depend-kind: variable-list )
39419 depend-kind:
39420 in | out | inout | mutexinoutset | depobj
39422 depend-modifier:
39423 iterator ( iterators-definition ) */
39425 static tree
39427 {
39431 matching_parens parens;
39435 do
39436 {
39444 {
39449 }
39466 else
39469 }
39476 {
39481 }
39484 {
39494 }
39500 {
39506 }
39507 else
39508 {
39513 {
39517 else
39519 }
39522 {
39527 }
39528 }
39531 invalid_kind:
39533 resync_fail:
39540 }
39542 /* OpenMP 4.0:
39543 map ( map-kind : variable-list )
39544 map ( variable-list )
39546 map-kind:
39547 alloc | to | from | tofrom
39549 OpenMP 4.5:
39550 map-kind:
39551 alloc | to | from | tofrom | release | delete
39553 map ( always [,] map-kind: variable-list )
39555 OpenMP 5.0:
39556 map ( [map-type-modifier[,] ...] map-kind: variable-list )
39558 map-type-modifier:
39559 always | close */
39561 static tree
39563 {
39574 {
39576 {
39579 }
39582 pos++;
39583 pos++;
39584 }
39589 {
39592 {
39595 }
39599 {
39601 {
39608 }
39610 }
39612 {
39614 {
39621 }
39623 }
39624 else
39625 {
39627 "modifier other than %<always%> or "
39634 }
39637 }
39641 {
39655 else
39656 {
39662 }
39665 }
39668 {
39672 }
39681 }
39683 /* OpenMP 4.0:
39684 device ( expression )
39686 OpenMP 5.0:
39687 device ( [device-modifier :] integer-expression )
39689 device-modifier:
39690 ancestor | device_num */
39692 static tree
39694 location_t location)
39695 {
39699 matching_parens parens;
39705 {
39709 {
39712 /* A requires directive with the reverse_offload clause must be
39713 specified. */
39715 {
39717 "preceded by %<requires%> directive "
39721 }
39722 }
39724 ;
39725 else
39726 {
39730 }
39733 }
39752 }
39754 /* OpenMP 4.0:
39755 dist_schedule ( static )
39756 dist_schedule ( static , expression ) */
39758 static tree
39760 location_t location)
39761 {
39764 matching_parens parens;
39775 {
39786 }
39790 /* check_no_duplicate_clause (list, OMP_CLAUSE_DIST_SCHEDULE,
39791 "dist_schedule", location); */
39797 invalid_kind:
39799 resync_fail:
39804 }
39806 /* OpenMP 4.0:
39807 proc_bind ( proc-bind-kind )
39809 proc-bind-kind:
39810 primary | master | close | spread
39811 where OpenMP 5.1 added 'primary' and deprecated the alias 'master'. */
39813 static tree
39815 location_t location)
39816 {
39817 tree c;
39824 {
39836 else
39838 }
39839 else
39848 location);
39853 invalid_kind:
39855 resync_fail:
39860 }
39862 /* OpenMP 5.0:
39863 device_type ( host | nohost | any ) */
39865 static tree
39867 location_t location)
39868 {
39869 tree c;
39876 {
39886 else
39888 }
39889 else
39897 /* check_no_duplicate_clause (list, OMP_CLAUSE_DEVICE_TYPE, "device_type",
39898 location); */
39903 invalid_kind:
39905 resync_fail:
39910 }
39912 /* OpenACC:
39913 async [( int-expr )] */
39915 static tree
39917 {
39924 {
39925 matching_parens parens;
39934 }
39944 }
39946 /* Parse all OpenACC clauses. The set clauses allowed by the directive
39947 is a bitmask in MASK. Return the list of clauses found. */
39949 static tree
39953 {
39957 /* Don't create location wrapper nodes within OpenACC clauses. */
39958 auto_suppress_location_wrappers sentinel;
39961 {
39962 location_t here;
39963 pragma_omp_clause c_kind;
39964 omp_clause_code code;
39975 {
39982 clauses);
40035 clauses);
40040 clauses);
40058 clauses);
40063 clauses);
40076 clauses);
40083 clauses);
40089 clauses);
40097 clauses);
40101 clauses
40108 clauses);
40117 clauses);
40123 OMP_CLAUSE_VECTOR,
40130 clauses);
40139 OMP_CLAUSE_WORKER,
40145 }
40150 {
40151 /* Remove the invalid clause(s) from the list to avoid
40152 confusing the rest of the compiler. */
40155 }
40156 }
40158 saw_error:
40165 }
40167 /* Parse all OpenMP clauses. The set clauses allowed by the directive
40168 is a bitmask in MASK. Return the list of clauses found.
40169 FINISH_P set if finish_omp_clauses should be called.
40170 NESTED non-zero if clauses should be terminated by closing paren instead
40171 of end of pragma. If it is 2, additionally commas are required in between
40172 the clauses. */
40174 static tree
40178 {
40183 /* Don't create location wrapper nodes within OpenMP clauses. */
40184 auto_suppress_location_wrappers sentinel;
40187 {
40188 pragma_omp_clause c_kind;
40196 /* OpenMP 5.1 allows optional comma in between directive-name and
40197 clauses everywhere, but as we aren't done with OpenMP 5.0
40198 implementation yet, let's allow it for now only in C++11
40199 attributes. */
40201 {
40206 "clauses in %<simd%> trait should be separated "
40208 }
40214 {
40231 clauses);
40250 clauses);
40270 clauses);
40275 clauses);
40280 clauses);
40285 clauses);
40294 clauses
40340 clauses);
40344 clauses
40356 clauses);
40360 clauses
40362 OMP_CLAUSE_TASK_REDUCTION,
40378 clauses);
40383 OMP_CLAUSE_NOTINBRANCH,
40392 {
40393 clause_not_first:
40397 }
40426 {
40428 clauses);
40432 }
40433 else
40445 clauses);
40467 {
40472 }
40528 clauses
40534 clauses
40541 clauses);
40547 }
40552 {
40553 /* Remove the invalid clause(s) from the list to avoid
40554 confusing the rest of the compiler. */
40557 }
40558 }
40559 saw_error:
40563 {
40566 else
40568 }
40570 }
40572 /* OpenMP 2.5:
40573 structured-block:
40574 statement
40576 In practice, we're also interested in adding the statement to an
40577 outer node. So it is convenient if we work around the fact that
40578 cp_parser_statement calls add_stmt. */
40580 static unsigned
40582 {
40585 /* Only move the values to IN_OMP_BLOCK if they weren't false.
40586 This preserves the "not within loop or switch" style error messages
40587 for nonsense cases like
40588 void foo() {
40589 #pragma omp single
40590 break;
40591 }
40592 */
40597 }
40599 static void
40601 {
40603 }
40605 static tree
40607 {
40616 }
40618 /* OpenMP 5.0:
40619 # pragma omp allocate (list) [allocator(allocator)] */
40621 static void
40623 {
40628 /* For now only in C++ attributes, do it always for OpenMP 5.1. */
40635 {
40636 matching_parens parens;
40644 {
40649 }
40650 }
40658 }
40660 /* OpenMP 2.5:
40661 # pragma omp atomic new-line
40662 expression-stmt
40664 expression-stmt:
40665 x binop= expr | x++ | ++x | x-- | --x
40666 binop:
40667 +, *, -, /, &, ^, |, <<, >>
40669 where x is an lvalue expression with scalar type.
40671 OpenMP 3.1:
40672 # pragma omp atomic new-line
40673 update-stmt
40675 # pragma omp atomic read new-line
40676 read-stmt
40678 # pragma omp atomic write new-line
40679 write-stmt
40681 # pragma omp atomic update new-line
40682 update-stmt
40684 # pragma omp atomic capture new-line
40685 capture-stmt
40687 # pragma omp atomic capture new-line
40688 capture-block
40690 read-stmt:
40691 v = x
40692 write-stmt:
40693 x = expr
40694 update-stmt:
40695 expression-stmt | x = x binop expr
40696 capture-stmt:
40697 v = expression-stmt
40698 capture-block:
40699 { v = x; update-stmt; } | { update-stmt; v = x; }
40701 OpenMP 4.0:
40702 update-stmt:
40703 expression-stmt | x = x binop expr | x = expr binop x
40704 capture-stmt:
40705 v = update-stmt
40706 capture-block:
40707 { v = x; update-stmt; } | { update-stmt; v = x; } | { v = x; x = expr; }
40709 OpenMP 5.1:
40710 # pragma omp atomic compare new-line
40711 conditional-update-atomic
40713 # pragma omp atomic compare capture new-line
40714 conditional-update-capture-atomic
40716 conditional-update-atomic:
40717 cond-expr-stmt | cond-update-stmt
40718 cond-expr-stmt:
40719 x = expr ordop x ? expr : x;
40720 x = x ordop expr ? expr : x;
40721 x = x == e ? d : x;
40722 cond-update-stmt:
40723 if (expr ordop x) { x = expr; }
40724 if (x ordop expr) { x = expr; }
40725 if (x == e) { x = d; }
40726 ordop:
40727 <, >
40728 conditional-update-capture-atomic:
40729 v = cond-expr-stmt
40730 { v = x; cond-expr-stmt }
40731 { cond-expr-stmt v = x; }
40732 { v = x; cond-update-stmt }
40733 { cond-update-stmt v = x; }
40734 if (x == e) { x = d; } else { v = x; }
40735 { r = x == e; if (r) { x = d; } }
40736 { r = x == e; if (r) { x = d; } else { v = x; } }
40738 where x, r and v are lvalue expressions with scalar type,
40739 expr, e and d are expressions with scalar type and e might be
40740 the same as v. */
40742 static void
40744 {
40761 {
40762 /* For now only in C++ attributes, do it always for OpenMP 5.1. */
40771 {
40776 enum omp_memory_order new_memory_order
40792 {
40796 }
40804 {
40805 matching_parens parens;
40812 {
40822 }
40825 {
40829 else
40831 }
40832 else
40842 }
40854 {
40858 }
40859 else
40860 {
40863 "%<capture%>, %<compare%>, %<weak%>, %<fail%>, "
40864 "%<seq_cst%>, %<acq_rel%>, %<release%>, "
40866 }
40868 {
40870 {
40871 /* OpenACC permits 'update capture'. */
40878 else
40880 }
40882 {
40885 else
40887 }
40889 {
40892 else
40894 }
40896 {
40899 else
40901 }
40903 {
40906 else
40908 }
40911 }
40912 }
40914 }
40920 {
40924 else
40926 }
40928 {
40932 }
40934 {
40937 }
40939 {
40942 }
40946 {
40947 omp_requires_mask
40952 {
40962 {
40972 }
40976 }
40977 }
40978 else
40980 {
40983 {
40987 }
40993 {
40997 }
41003 }
41005 memory_order
41010 {
41020 else
41025 {
41026 /* atomic write is represented by OMP_ATOMIC with NOP_EXPR
41027 opcode. */
41032 }
41036 {
41039 }
41043 else
41044 {
41052 {
41056 }
41057 }
41060 }
41062 restart:
41064 {
41067 matching_parens parens;
41071 tree cmp_expr;
41074 else
41082 {
41088 }
41090 ;
41092 {
41096 }
41099 {
41101 "expected %<==%>, %<<%> or %<>%> comparison in %<if%> "
41104 }
41115 {
41118 }
41123 else
41136 {
41138 {
41141 }
41143 {
41148 }
41149 else
41151 }
41156 {
41161 }
41162 else
41163 {
41164 bad_if:
41168 }
41171 {
41175 {
41179 }
41207 /* Signal to c_finish_omp_atomic that in
41208 if (x == e) { x = d; } else { v = x; }
41209 case the store to v should be conditional. */
41211 }
41213 {
41216 }
41222 }
41226 {
41233 /* FALLTHROUGH */
41245 /* FALLTHROUGH */
41262 /* Undo effects of boolean_increment for post {in,de}crement. */
41264 /* FALLTHRU */
41268 {
41269 /* Undo effects of boolean_increment. */
41271 {
41272 /* This is pre or post increment. */
41277 && !structured_block
41283 }
41284 }
41285 /* FALLTHRU */
41288 {
41291 }
41293 {
41328 {
41332 }
41335 {
41341 {
41346 }
41348 {
41362 {
41364 {
41369 }
41370 else
41372 }
41377 || !structured_block
41378 || v
41384 {
41386 {
41392 }
41393 }
41401 {
41405 cond_expr:
41407 bool saved_colon_corrects_to_scope_p
41411 parser->colon_corrects_to_scope_p
41416 {
41418 {
41420 {
41424 }
41426 {
41427 opcode
41431 }
41432 }
41433 else
41434 {
41437 {
41438 opcode
41443 }
41444 }
41445 }
41447 "invalid form of "
41450 }
41454 }
41459 {
41466 }
41470 }
41474 {
41477 {
41485 }
41487 {
41492 }
41536 }
41539 {
41541 "invalid form of "
41544 }
41555 {
41557 {
41559 "invalid form of "
41562 }
41564 }
41570 }
41577 }
41578 stmt_done:
41580 {
41593 }
41595 {
41599 }
41600 done:
41602 {
41605 }
41613 invalid_compare:
41615 /* FALLTHRU */
41616 saw_error:
41621 {
41625 {
41629 }
41630 }
41631 }
41634 /* OpenMP 2.5:
41635 # pragma omp barrier new-line */
41637 static void
41639 {
41642 }
41644 /* OpenMP 2.5:
41645 # pragma omp critical [(name)] new-line
41646 structured-block
41648 OpenMP 4.5:
41649 # pragma omp critical [(name) [hint(expression)]] new-line
41650 structured-block */
41652 #define OMP_CRITICAL_CLAUSE_MASK \
41653 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_HINT) )
41655 static tree
41657 {
41661 {
41662 matching_parens parens;
41678 }
41685 }
41687 /* OpenMP 5.0:
41688 # pragma omp depobj ( depobj ) depobj-clause new-line
41690 depobj-clause:
41691 depend (dependence-type : locator)
41692 destroy
41693 update (dependence-type)
41695 dependence-type:
41696 in
41697 out
41698 inout
41699 mutexinout */
41701 static void
41703 {
41705 matching_parens parens;
41707 {
41710 }
41722 /* For now only in C++ attributes, do it always for OpenMP 5.1. */
41727 {
41733 {
41734 /* Don't create location wrapper nodes within the depend clause. */
41735 auto_suppress_location_wrappers sentinel;
41741 }
41745 {
41746 matching_parens c_parens;
41748 {
41749 location_t c2_loc
41752 {
41767 }
41769 {
41773 }
41779 }
41780 else
41782 }
41783 }
41785 {
41788 }
41792 }
41795 /* OpenMP 2.5:
41796 # pragma omp flush flush-vars[opt] new-line
41798 flush-vars:
41799 ( variable-list )
41801 OpenMP 5.0:
41802 # pragma omp flush memory-order-clause new-line */
41804 static void
41806 {
41808 /* For now only in C++ attributes, do it always for OpenMP 5.1. */
41814 {
41825 else
41827 "expected %<seq_cst%>, %<acq_rel%>, %<release%> or "
41830 }
41832 {
41835 "%<flush%> list specified together with memory order "
41838 }
41842 }
41844 /* Helper function, to parse omp for increment expression. */
41846 static tree
41848 {
41853 {
41856 }
41859 {
41871 }
41873 /* If decl is an iterator, preserve LHS and RHS of the relational
41874 expr until finish_omp_for. */
41885 }
41887 /* Helper function, to parse omp for increment expression. */
41889 static tree
41891 {
41895 cp_id_kind idk;
41899 {
41908 }
41917 {
41922 }
41929 {
41933 }
41946 do
41947 {
41954 {
41956 {
41959 else
41962 }
41963 else
41968 }
41969 }
41973 {
41979 }
41980 else
41984 }
41986 /* Parse the initialization statement of an OpenMP for loop.
41988 Return true if the resulting construct should have an
41989 OMP_CLAUSE_PRIVATE added to it. */
41991 static tree
41999 {
42005 /* See 2.5.1 (in OpenMP 3.0, similar wording is in 2.5 standard too):
42007 init-expr:
42008 var = lb
42009 integer-type var = lb
42010 random-access-iterator-type var = lb
42011 pointer-type var = lb
42012 */
42013 cp_decl_specifier_seq type_specifiers;
42015 /* First, try to parse as an initialized declaration. See
42016 cp_parser_condition, from whence the bulk of this is copied. */
42024 {
42025 /* If parsing a type specifier seq succeeded, then this
42026 MUST be a initialized declaration. */
42031 CP_PARSER_DECLARATOR_NAMED,
42032 CP_PARSER_FLAGS_NONE,
42044 else
42045 {
42055 {
42057 CPP_OPEN_PAREN))
42060 else
42061 /* Trigger an error. */
42066 }
42070 {
42078 {
42081 auto_node);
42086 }
42089 asm_specification,
42090 LOOKUP_ONLYCONVERTING);
42093 {
42096 }
42097 else
42098 {
42101 {
42103 /* Move lambda DECL_EXPRs to FOR_BLOCK. */
42105 {
42109 {
42113 }
42115 }
42117 {
42122 }
42123 }
42124 }
42126 }
42127 else
42128 {
42129 /* Consume '='. */
42133 non_class:
42136 else
42139 asm_specification,
42140 LOOKUP_ONLYCONVERTING);
42141 }
42145 }
42146 }
42147 else
42148 {
42149 cp_id_kind idk;
42150 /* If parsing a type specifier sequence failed, then
42151 this MUST be a simple expression. */
42157 && decl
42160 {
42171 {
42176 }
42181 }
42183 && decl
42186 {
42187 tree rhs;
42196 tf_warning_or_error));
42199 }
42200 else
42201 {
42206 {
42210 }
42211 }
42212 }
42214 }
42216 /* Helper for cp_parser_omp_for_loop, handle one range-for loop. */
42218 void
42222 {
42227 {
42231 /* do_auto_deduction doesn't mess with template init-lists. */
42233 {
42236 {
42242 }
42244 }
42251 }
42256 /* If an error happened previously do nothing or else a lot of
42257 unhelpful errors would be issued. */
42259 else
42260 {
42261 tree range_temp;
42265 /* Can't bind a reference to an array of runtime bound. */
42267 else
42268 {
42274 LOOKUP_ONLYCONVERTING);
42277 }
42280 }
42291 LOOKUP_ONLYCONVERTING);
42293 /* The new for initialization statement. */
42301 else
42302 {
42305 }
42308 LOOKUP_ONLYCONVERTING);
42310 /* The new for condition. */
42313 else
42319 /* The new increment expression. */
42322 else
42325 tf_warning_or_error);
42330 {
42333 }
42338 {
42343 {
42348 }
42349 }
42353 {
42359 }
42366 {
42369 }
42371 }
42373 /* Helper for cp_parser_omp_for_loop, finalize part of range for
42374 inside of the collapsed body. */
42376 void
42378 {
42386 {
42390 }
42392 /* The declaration is initialized with *__begin inside the loop body. */
42397 LOOKUP_ONLYCONVERTING);
42400 }
42402 /* Return true if next tokens contain a standard attribute that contains
42403 omp::directive (DIRECTIVE). */
42405 static bool
42408 {
42416 {
42423 }
42428 location_t last_loc
42437 {
42439 {
42443 cnt++;
42447 {
42451 }
42452 }
42453 }
42455 {
42458 }
42460 {
42462 "%<[[omp::directive(%s)]]%> must be the only specified "
42466 }
42471 }
42473 /* Parse an OpenMP structured block sequence. KIND is the corresponding
42474 separating directive. */
42476 static tree
42479 {
42485 {
42498 kind == PRAGMA_OMP_SCAN
42503 }
42507 }
42510 /* OpenMP 5.0:
42512 scan-loop-body:
42513 { structured-block scan-directive structured-block } */
42515 static void
42517 {
42520 matching_braces braces;
42530 {
42540 {
42547 }
42549 {
42552 }
42553 else
42558 }
42559 else
42565 clauses);
42569 }
42571 /* Parse the restricted form of the for statement allowed by OpenMP. */
42573 static tree
42576 {
42578 tree orig_decl;
42581 location_t loc_first;
42584 releasing_vec for_block;
42593 {
42596 }
42599 {
42602 }
42609 {
42615 }
42617 {
42620 {
42622 "%<linear%> clause may not be specified together "
42625 }
42626 else
42628 }
42642 {
42645 location_t loc;
42648 {
42652 }
42655 /* Don't create location wrapper nodes within an OpenMP "for"
42656 statement. */
42657 auto_suppress_location_wrappers sentinel;
42659 matching_parens parens;
42667 {
42668 /* Save tokens so that we can put them back. */
42671 /* Look for ':' that is not nested in () or {}. */
42672 bool is_range_for
42675 CPP_COLON,
42676 /*consume_paren=*/
42679 /* Roll back the tokens we skipped. */
42683 {
42684 bool saved_colon_corrects_to_scope_p
42687 /* A colon is used in range-based for. */
42690 /* Parse the declaration. */
42692 /*function_definition_allowed_p=*/
42694 parser->colon_corrects_to_scope_p
42706 {
42708 {
42714 }
42715 else
42717 }
42721 "%<ordered%> clause with parameter on "
42725 }
42726 }
42728 add_private_clause
42734 {
42737 {
42743 }
42744 else
42746 }
42754 {
42759 {
42763 }
42766 {
42767 /* Move lastprivate (decl) clause to OMP_FOR_CLAUSES. */
42771 {
42774 }
42775 else
42776 {
42779 }
42781 }
42782 else
42783 {
42788 }
42789 }
42792 {
42793 tree c;
42795 {
42804 decl);
42809 decl);
42810 }
42812 {
42817 else
42822 {
42825 /* For linear, signal that we need to fill up
42826 the so far unknown linear step. */
42829 }
42830 }
42831 }
42840 {
42841 /* If decl is an iterator, preserve the operator on decl
42842 until finish_omp_for. */
42844 && ((processing_template_decl
42849 else
42852 }
42854 parse_close_paren:
42865 {
42868 }
42870 {
42874 }
42881 /* FIXME: OpenMP 3.0 draft isn't very clear on what exactly is allowed
42882 in between the collapsed for loops to be still considered perfectly
42883 nested. Hopefully the final version clarifies this.
42884 For now handle (multiple) {'s and empty statements. */
42887 {
42891 {
42893 bracecount++;
42894 }
42898 else
42899 {
42906 }
42907 }
42910 {
42913 }
42914 }
42919 /* Note that we saved the original contents of this flag when we entered
42920 the structured block, and so we don't need to re-save it here. */
42923 /* Note that the grammar doesn't call for a structured block here,
42924 though the loop as a whole is a structured block. */
42926 {
42932 }
42933 else
42937 else
42941 else
42946 else
42951 {
42953 {
42955 nbraces--;
42956 }
42959 else
42960 {
42962 {
42965 }
42970 }
42971 }
42974 {
42978 else
42980 }
42983 }
42985 /* Helper function for OpenMP parsing, split clauses and call
42986 finish_omp_clauses on each of the set of clauses afterwards. */
42988 static void
42991 {
42997 i == C_OMP_CLAUSE_SPLIT_TARGET
42999 }
43001 /* OpenMP 5.0:
43002 #pragma omp loop loop-clause[optseq] new-line
43003 for-loop */
43005 #define OMP_LOOP_CLAUSE_MASK \
43006 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_PRIVATE) \
43007 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_LASTPRIVATE) \
43008 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_REDUCTION) \
43009 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_COLLAPSE) \
43010 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_BIND) \
43011 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_ORDER))
43013 static tree
43017 {
43028 {
43031 }
43043 }
43045 /* OpenMP 4.0:
43046 #pragma omp simd simd-clause[optseq] new-line
43047 for-loop */
43049 #define OMP_SIMD_CLAUSE_MASK \
43050 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_SAFELEN) \
43051 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_SIMDLEN) \
43052 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_LINEAR) \
43053 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_ALIGNED) \
43054 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_PRIVATE) \
43055 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_LASTPRIVATE) \
43056 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_REDUCTION) \
43057 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_COLLAPSE) \
43058 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_IF) \
43059 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_NONTEMPORAL) \
43060 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_ORDER))
43062 static tree
43066 {
43077 {
43081 OMP_CLAUSE_ORDERED);
43083 {
43085 "%<ordered%> clause with parameter may not be specified "
43088 }
43089 }
43101 }
43103 /* OpenMP 2.5:
43104 #pragma omp for for-clause[optseq] new-line
43105 for-loop
43107 OpenMP 4.0:
43108 #pragma omp for simd for-simd-clause[optseq] new-line
43109 for-loop */
43111 #define OMP_FOR_CLAUSE_MASK \
43112 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_PRIVATE) \
43113 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_FIRSTPRIVATE) \
43114 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_LASTPRIVATE) \
43115 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_LINEAR) \
43116 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_REDUCTION) \
43117 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_ORDERED) \
43118 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_SCHEDULE) \
43119 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_NOWAIT) \
43120 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_COLLAPSE) \
43121 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_ALLOCATE) \
43122 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_ORDER))
43124 static tree
43128 {
43135 /* parallel for{, simd} disallows nowait clause, but for
43136 target {teams distribute ,}parallel for{, simd} it should be accepted. */
43139 /* Composite distribute parallel for{, simd} disallows ordered clause. */
43144 {
43149 {
43173 }
43174 }
43176 {
43179 }
43181 /* Composite distribute parallel for disallows linear clause. */
43188 {
43191 }
43203 }
43208 /* OpenMP 2.5:
43209 # pragma omp master new-line
43210 structured-block */
43212 static tree
43216 {
43224 {
43229 {
43249 }
43250 }
43252 {
43255 }
43258 {
43262 }
43263 else
43268 }
43270 /* OpenMP 5.1:
43271 # pragma omp masked masked-clauses new-line
43272 structured-block */
43274 #define OMP_MASKED_CLAUSE_MASK \
43275 (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_FILTER)
43277 static tree
43281 {
43290 {
43295 {
43316 }
43317 }
43319 {
43322 }
43327 {
43330 }
43334 clauses);
43335 }
43337 /* OpenMP 2.5:
43338 # pragma omp ordered new-line
43339 structured-block
43341 OpenMP 4.5:
43342 # pragma omp ordered ordered-clauses new-line
43343 structured-block */
43345 #define OMP_ORDERED_CLAUSE_MASK \
43346 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_THREADS) \
43347 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_SIMD))
43349 #define OMP_ORDERED_DEPEND_CLAUSE_MASK \
43350 (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DEPEND)
43352 static bool
43355 {
43359 /* For now only in C++ attributes, do it always for OpenMP 5.1. */
43365 {
43370 {
43372 {
43375 }
43377 {
43379 "%<depend%> clause may only be used in compound "
43383 }
43384 tree clauses
43386 OMP_ORDERED_DEPEND_CLAUSE_MASK,
43390 }
43391 }
43393 tree clauses
43404 }
43406 /* OpenMP 2.5:
43408 section-scope:
43409 { section-sequence }
43411 section-sequence:
43412 section-directive[opt] structured-block
43413 section-sequence section-directive structured-block */
43415 static tree
43417 {
43422 matching_braces braces;
43429 != PRAGMA_OMP_SECTION
43431 {
43433 PRAGMA_OMP_SECTION);
43436 }
43439 {
43449 {
43453 }
43455 {
43458 }
43461 PRAGMA_OMP_SECTION);
43464 }
43475 }
43477 /* OpenMP 2.5:
43478 # pragma omp sections sections-clause[optseq] newline
43479 sections-scope */
43481 #define OMP_SECTIONS_CLAUSE_MASK \
43482 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_PRIVATE) \
43483 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_FIRSTPRIVATE) \
43484 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_LASTPRIVATE) \
43485 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_REDUCTION) \
43486 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_ALLOCATE) \
43487 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_NOWAIT))
43489 static tree
43492 {
43504 {
43507 }
43514 }
43516 /* OpenMP 2.5:
43517 # pragma omp parallel parallel-clause[optseq] new-line
43518 structured-block
43519 # pragma omp parallel for parallel-for-clause[optseq] new-line
43520 structured-block
43521 # pragma omp parallel sections parallel-sections-clause[optseq] new-line
43522 structured-block
43524 OpenMP 4.0:
43525 # pragma omp parallel for simd parallel-for-simd-clause[optseq] new-line
43526 structured-block */
43528 #define OMP_PARALLEL_CLAUSE_MASK \
43529 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_IF) \
43530 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_PRIVATE) \
43531 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_FIRSTPRIVATE) \
43532 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DEFAULT) \
43533 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_SHARED) \
43534 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_COPYIN) \
43535 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_REDUCTION) \
43536 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_NUM_THREADS) \
43537 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_ALLOCATE) \
43538 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_PROC_BIND))
43540 static tree
43544 {
43551 /* #pragma omp target parallel{, for, for simd} disallow copyin clause. */
43557 {
43565 if_p);
43569 if_p);
43572 block);
43577 }
43578 /* When combined with distribute, parallel has to be followed by for.
43579 #pragma omp target parallel is allowed though. */
43583 {
43587 }
43589 {
43593 {
43607 block);
43610 /* masked does have just filter clause, but during gimplification
43611 isn't represented by a gimplification omp context, so for
43612 #pragma omp parallel masked don't set OMP_PARALLEL_COMBINED,
43613 so that
43614 #pragma omp parallel masked
43615 #pragma omp taskloop simd lastprivate (x)
43616 isn't confused with
43617 #pragma omp parallel masked taskloop simd lastprivate (x) */
43621 }
43623 {
43637 block);
43640 /* master doesn't have any clauses and during gimplification
43641 isn't represented by a gimplification omp context, so for
43642 #pragma omp parallel master don't set OMP_PARALLEL_COMBINED,
43643 so that
43644 #pragma omp parallel master
43645 #pragma omp taskloop simd lastprivate (x)
43646 isn't confused with
43647 #pragma omp parallel master taskloop simd lastprivate (x) */
43651 }
43653 {
43668 block);
43673 }
43675 {
43678 }
43680 {
43690 block);
43693 }
43694 }
43696 {
43699 }
43704 {
43707 }
43716 }
43718 /* OpenMP 2.5:
43719 # pragma omp single single-clause[optseq] new-line
43720 structured-block */
43722 #define OMP_SINGLE_CLAUSE_MASK \
43723 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_PRIVATE) \
43724 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_FIRSTPRIVATE) \
43725 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_COPYPRIVATE) \
43726 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_ALLOCATE) \
43727 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_NOWAIT))
43729 static tree
43731 {
43742 }
43744 /* OpenMP 5.1:
43745 # pragma omp scope scope-clause[optseq] new-line
43746 structured-block */
43748 #define OMP_SCOPE_CLAUSE_MASK \
43749 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_PRIVATE) \
43750 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_REDUCTION) \
43751 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_NOWAIT))
43753 static tree
43755 {
43766 }
43768 /* OpenMP 3.0:
43769 # pragma omp task task-clause[optseq] new-line
43770 structured-block */
43772 #define OMP_TASK_CLAUSE_MASK \
43773 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_IF) \
43774 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_UNTIED) \
43775 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DEFAULT) \
43776 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_PRIVATE) \
43777 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_FIRSTPRIVATE) \
43778 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_SHARED) \
43779 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_FINAL) \
43780 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_MERGEABLE) \
43781 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DEPEND) \
43782 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_PRIORITY) \
43783 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_ALLOCATE) \
43784 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_IN_REDUCTION) \
43785 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DETACH) \
43786 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_AFFINITY))
43788 static tree
43790 {
43802 }
43804 /* OpenMP 3.0:
43805 # pragma omp taskwait new-line
43807 OpenMP 5.0:
43808 # pragma omp taskwait taskwait-clause[opt] new-line */
43810 #define OMP_TASKWAIT_CLAUSE_MASK \
43811 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DEPEND) \
43812 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_NOWAIT))
43814 static void
43816 {
43817 tree clauses
43822 {
43829 }
43830 else
43832 }
43834 /* OpenMP 3.1:
43835 # pragma omp taskyield new-line */
43837 static void
43839 {
43842 }
43844 /* OpenMP 4.0:
43845 # pragma omp taskgroup new-line
43846 structured-block
43848 OpenMP 5.0:
43849 # pragma omp taskgroup taskgroup-clause[optseq] new-line */
43851 #define OMP_TASKGROUP_CLAUSE_MASK \
43852 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_ALLOCATE) \
43853 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_TASK_REDUCTION))
43855 static tree
43857 {
43858 tree clauses
43863 if_p),
43864 clauses);
43865 }
43868 /* OpenMP 2.5:
43869 # pragma omp threadprivate (variable-list) */
43871 static void
43873 {
43874 tree vars;
43880 }
43882 /* OpenMP 4.0:
43883 # pragma omp cancel cancel-clause[optseq] new-line */
43885 #define OMP_CANCEL_CLAUSE_MASK \
43886 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_PARALLEL) \
43887 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_FOR) \
43888 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_SECTIONS) \
43889 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_TASKGROUP) \
43890 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_IF))
43892 static void
43894 {
43898 }
43900 /* OpenMP 4.0:
43901 # pragma omp cancellation point cancelpt-clause[optseq] new-line */
43903 #define OMP_CANCELLATION_POINT_CLAUSE_MASK \
43904 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_PARALLEL) \
43905 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_FOR) \
43906 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_SECTIONS) \
43907 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_TASKGROUP))
43909 static bool
43912 {
43913 tree clauses;
43917 {
43922 {
43925 }
43926 }
43928 {
43932 }
43935 {
43940 else
43944 }
43947 OMP_CANCELLATION_POINT_CLAUSE_MASK,
43949 pragma_tok);
43952 }
43954 /* OpenMP 4.0:
43955 #pragma omp distribute distribute-clause[optseq] new-line
43956 for-loop */
43958 #define OMP_DISTRIBUTE_CLAUSE_MASK \
43959 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_PRIVATE) \
43960 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_FIRSTPRIVATE) \
43961 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_LASTPRIVATE) \
43962 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DIST_SCHEDULE)\
43963 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_ALLOCATE) \
43964 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_COLLAPSE) \
43965 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_ORDER))
43967 static tree
43971 {
43980 {
43988 else
43991 {
43997 {
44001 else
44004 }
44010 else
44024 }
44025 }
44027 {
44030 }
44035 {
44038 }
44050 }
44052 /* OpenMP 4.0:
44053 # pragma omp teams teams-clause[optseq] new-line
44054 structured-block */
44056 #define OMP_TEAMS_CLAUSE_MASK \
44057 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_PRIVATE) \
44058 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_FIRSTPRIVATE) \
44059 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_SHARED) \
44060 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_REDUCTION) \
44061 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_NUM_TEAMS) \
44062 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_THREAD_LIMIT) \
44063 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_ALLOCATE) \
44064 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DEFAULT))
44066 static tree
44070 {
44079 {
44083 {
44109 }
44111 {
44137 }
44138 }
44140 {
44143 }
44148 {
44151 }
44161 }
44163 /* OpenMP 4.0:
44164 # pragma omp target data target-data-clause[optseq] new-line
44165 structured-block */
44167 #define OMP_TARGET_DATA_CLAUSE_MASK \
44168 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DEVICE) \
44169 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_MAP) \
44170 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_IF) \
44171 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_USE_DEVICE_PTR) \
44172 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_USE_DEVICE_ADDR))
44174 static tree
44176 {
44177 tree clauses
44183 {
44186 {
44204 "%<#pragma omp target data%> with map-type other "
44205 "than %<to%>, %<from%>, %<tofrom%> or %<alloc%> "
44209 }
44214 }
44217 {
44220 "%<#pragma omp target data%> must contain at least "
44221 "one %<map%>, %<use_device_ptr%> or %<use_device_addr%> "
44224 }
44235 }
44237 /* OpenMP 4.5:
44238 # pragma omp target enter data target-enter-data-clause[optseq] new-line
44239 structured-block */
44241 #define OMP_TARGET_ENTER_DATA_CLAUSE_MASK \
44242 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DEVICE) \
44243 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_MAP) \
44244 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_IF) \
44245 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DEPEND) \
44246 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_NOWAIT))
44248 static bool
44251 {
44254 {
44259 {
44262 }
44263 }
44265 {
44269 }
44272 {
44278 }
44280 tree clauses
44286 {
44289 {
44303 "%<#pragma omp target enter data%> with map-type other "
44307 }
44309 }
44312 {
44315 "%<#pragma omp target enter data%> must contain at least "
44318 }
44326 }
44328 /* OpenMP 4.5:
44329 # pragma omp target exit data target-enter-data-clause[optseq] new-line
44330 structured-block */
44332 #define OMP_TARGET_EXIT_DATA_CLAUSE_MASK \
44333 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DEVICE) \
44334 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_MAP) \
44335 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_IF) \
44336 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DEPEND) \
44337 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_NOWAIT))
44339 static bool
44342 {
44345 {
44350 {
44353 }
44354 }
44356 {
44360 }
44363 {
44369 }
44371 tree clauses
44377 {
44380 {
44395 "%<#pragma omp target exit data%> with map-type other "
44396 "than %<from%>, %<release%> or %<delete%> on %<map%>"
44400 }
44402 }
44405 {
44408 "%<#pragma omp target exit data%> must contain at least "
44411 }
44419 }
44421 /* OpenMP 4.0:
44422 # pragma omp target update target-update-clause[optseq] new-line */
44424 #define OMP_TARGET_UPDATE_CLAUSE_MASK \
44425 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_FROM) \
44426 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_TO) \
44427 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DEVICE) \
44428 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_IF) \
44429 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DEPEND) \
44430 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_NOWAIT))
44432 static bool
44435 {
44437 {
44443 }
44445 tree clauses
44450 {
44452 "%<#pragma omp target update%> must contain at least one "
44455 }
44463 }
44465 /* OpenMP 4.0:
44466 # pragma omp target target-clause[optseq] new-line
44467 structured-block */
44469 #define OMP_TARGET_CLAUSE_MASK \
44470 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DEVICE) \
44471 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_MAP) \
44472 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_IF) \
44473 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DEPEND) \
44474 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_NOWAIT) \
44475 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_PRIVATE) \
44476 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_FIRSTPRIVATE) \
44477 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DEFAULTMAP) \
44478 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_ALLOCATE) \
44479 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_IN_REDUCTION) \
44480 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_THREAD_LIMIT) \
44481 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_IS_DEVICE_PTR)\
44482 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_HAS_DEVICE_ADDR))
44484 static bool
44487 {
44489 omp_requires_mask
44493 {
44505 {
44513 {
44514 tree stmt;
44516 {
44519 OMP_TARGET_CLAUSE_MASK,
44524 OMP_TARGET_CLAUSE_MASK,
44529 OMP_TARGET_CLAUSE_MASK,
44534 }
44536 }
44541 {
44545 if_p);
44550 if_p);
44555 if_p);
44559 }
44565 /* For combined target teams, ensure the num_teams and
44566 thread_limit clause expressions are evaluated on the host,
44567 before entering the target construct. */
44576 {
44579 tf_none);
44586 OMP_CLAUSE_FIRSTPRIVATE);
44591 }
44596 }
44598 {
44601 }
44603 {
44607 }
44609 {
44612 }
44614 {
44617 }
44619 {
44622 }
44623 }
44625 {
44628 }
44635 {
44641 }
44650 }
44652 /* OpenACC 2.0:
44653 # pragma acc cache (variable-list) new-line
44654 */
44656 static tree
44658 {
44659 /* Don't create location wrapper nodes within 'OMP_CLAUSE__CACHE_'
44660 clauses. */
44661 auto_suppress_location_wrappers sentinel;
44677 }
44679 /* OpenACC 2.0:
44680 # pragma acc data oacc-data-clause[optseq] new-line
44681 structured-block */
44683 #define OACC_DATA_CLAUSE_MASK \
44684 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_ATTACH) \
44685 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_COPY) \
44686 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_COPYIN) \
44687 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_COPYOUT) \
44688 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_CREATE) \
44689 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_DETACH) \
44690 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_DEVICEPTR) \
44691 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_IF) \
44692 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_NO_CREATE) \
44693 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_PRESENT) )
44695 static tree
44697 {
44710 }
44712 /* OpenACC 2.0:
44713 # pragma acc host_data <clauses> new-line
44714 structured-block */
44716 #define OACC_HOST_DATA_CLAUSE_MASK \
44717 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_USE_DEVICE) \
44718 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_IF) \
44719 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_IF_PRESENT) )
44721 static tree
44723 {
44736 }
44738 /* OpenACC 2.0:
44739 # pragma acc declare oacc-data-clause[optseq] new-line
44740 */
44742 #define OACC_DECLARE_CLAUSE_MASK \
44743 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_COPY) \
44744 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_COPYIN) \
44745 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_COPYOUT) \
44746 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_CREATE) \
44747 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_DEVICEPTR) \
44748 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_DEVICE_RESIDENT) \
44749 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_LINK) \
44750 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_PRESENT) )
44752 static tree
44754 {
44764 {
44768 }
44771 {
44775 {
44779 }
44782 {
44794 {
44796 "%qD must be a global variable in "
44798 decl);
44801 }
44806 {
44810 }
44812 {
44814 "invalid use of %<extern%> variable %qD "
44818 }
44820 {
44822 "invalid use of %<global%> variable %qD "
44826 }
44828 }
44831 /* This seems to ignore the existence of cleanup scopes?
44832 What is the meaning for local extern decls? The local
44833 extern is in this scope, but it is referring to a decl that
44834 is namespace scope. */
44837 {
44840 }
44842 {
44844 "%qD must be a variable declared in the same scope as "
44848 }
44853 {
44858 }
44861 {
44862 tree id;
44865 /* We need to mark the aliased decl, as that is the entity
44866 that is being referred to. This won't work for
44867 dependent variables, but it didn't work for them before
44868 DECL_LOCAL_DECL_P was a thing either. But then
44869 dependent local extern variable decls are as rare as
44870 hen's teeth. */
44877 else
44883 {
44886 {
44889 {
44893 }
44894 }
44895 }
44896 }
44897 }
44910 }
44912 /* OpenACC 2.0:
44913 # pragma acc enter data oacc-enter-data-clause[optseq] new-line
44915 or
44917 # pragma acc exit data oacc-exit-data-clause[optseq] new-line
44919 LOC is the location of the #pragma token.
44920 */
44922 #define OACC_ENTER_DATA_CLAUSE_MASK \
44923 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_IF) \
44924 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_ATTACH) \
44925 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_ASYNC) \
44926 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_COPYIN) \
44927 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_CREATE) \
44928 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_WAIT) )
44930 #define OACC_EXIT_DATA_CLAUSE_MASK \
44931 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_IF) \
44932 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_ASYNC) \
44933 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_COPYOUT) \
44934 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_DELETE) \
44935 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_DETACH) \
44936 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_FINALIZE) \
44937 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_WAIT) )
44939 static tree
44942 {
44951 {
44956 }
44963 else
44968 {
44972 }
44980 }
44982 /* OpenACC 2.0:
44983 # pragma acc loop oacc-loop-clause[optseq] new-line
44984 structured-block */
44986 #define OACC_LOOP_CLAUSE_MASK \
44987 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_COLLAPSE) \
44988 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_PRIVATE) \
44989 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_REDUCTION) \
44990 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_GANG) \
44991 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_VECTOR) \
44992 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_WORKER) \
44993 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_AUTO) \
44994 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_INDEPENDENT) \
44995 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_SEQ) \
44996 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_TILE))
44998 static tree
45001 {
45010 {
45016 }
45025 }
45027 /* OpenACC 2.0:
45028 # pragma acc kernels oacc-kernels-clause[optseq] new-line
45029 structured-block
45031 or
45033 # pragma acc parallel oacc-parallel-clause[optseq] new-line
45034 structured-block
45036 OpenACC 2.6:
45038 # pragma acc serial oacc-serial-clause[optseq] new-line
45039 */
45041 #define OACC_KERNELS_CLAUSE_MASK \
45042 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_ASYNC) \
45043 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_ATTACH) \
45044 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_COPY) \
45045 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_COPYIN) \
45046 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_COPYOUT) \
45047 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_CREATE) \
45048 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_DEFAULT) \
45049 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_DEVICEPTR) \
45050 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_IF) \
45051 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_NO_CREATE) \
45052 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_NUM_GANGS) \
45053 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_NUM_WORKERS) \
45054 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_PRESENT) \
45055 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_VECTOR_LENGTH) \
45056 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_WAIT) )
45058 #define OACC_PARALLEL_CLAUSE_MASK \
45059 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_ASYNC) \
45060 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_ATTACH) \
45061 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_COPY) \
45062 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_COPYIN) \
45063 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_COPYOUT) \
45064 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_CREATE) \
45065 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_DEFAULT) \
45066 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_DEVICEPTR) \
45067 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_FIRSTPRIVATE) \
45068 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_IF) \
45069 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_NO_CREATE) \
45070 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_NUM_GANGS) \
45071 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_NUM_WORKERS) \
45072 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_PRESENT) \
45073 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_PRIVATE) \
45074 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_REDUCTION) \
45075 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_VECTOR_LENGTH) \
45076 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_WAIT) )
45078 #define OACC_SERIAL_CLAUSE_MASK \
45079 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_ASYNC) \
45080 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_ATTACH) \
45081 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_COPY) \
45082 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_COPYIN) \
45083 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_COPYOUT) \
45084 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_CREATE) \
45085 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_DEFAULT) \
45086 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_DEVICEPTR) \
45087 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_IF) \
45088 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_NO_CREATE) \
45089 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_PRIVATE) \
45090 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_FIRSTPRIVATE) \
45091 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_PRESENT) \
45092 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_REDUCTION) \
45093 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_WAIT) )
45095 static tree
45098 {
45099 omp_clause_mask mask;
45102 {
45120 }
45123 {
45127 {
45130 tree clauses;
45135 }
45136 }
45145 }
45147 /* OpenACC 2.0:
45148 # pragma acc update oacc-update-clause[optseq] new-line
45149 */
45151 #define OACC_UPDATE_CLAUSE_MASK \
45152 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_ASYNC) \
45153 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_DEVICE) \
45154 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_HOST) \
45155 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_IF) \
45156 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_IF_PRESENT) \
45157 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_WAIT))
45159 static tree
45161 {
45168 {
45170 "%<#pragma acc update%> must contain at least one "
45173 }
45181 }
45183 /* OpenACC 2.0:
45184 # pragma acc wait [(intseq)] oacc-wait-clause[optseq] new-line
45186 LOC is the location of the #pragma token.
45187 */
45189 #define OACC_WAIT_CLAUSE_MASK \
45190 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_ASYNC))
45192 static tree
45194 {
45208 }
45210 /* OpenMP 4.0:
45211 # pragma omp declare simd declare-simd-clauses[optseq] new-line */
45213 #define OMP_DECLARE_SIMD_CLAUSE_MASK \
45214 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_SIMDLEN) \
45215 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_LINEAR) \
45216 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_ALIGNED) \
45217 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_UNIFORM) \
45218 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_INBRANCH) \
45219 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_NOTINBRANCH))
45221 static void
45225 {
45227 cp_omp_declare_simd_data data;
45229 {
45237 /* It is safe to take the address of a local variable; it will only be
45238 used while this scope is live. */
45240 }
45242 {
45244 "%<#pragma omp declare %s%> followed by "
45249 }
45251 /* Store away all pragma tokens. */
45260 {
45264 {
45277 }
45282 "%<#pragma omp declare %s%> not immediately followed by "
45287 }
45288 }
45300 /* OpenMP 5.0:
45302 trait-selector:
45303 trait-selector-name[([trait-score:]trait-property[,trait-property[,...]])]
45305 trait-score:
45306 score(score-expression) */
45308 static tree
45310 {
45312 do
45313 {
45314 tree selector;
45318 else
45319 {
45322 }
45333 {
45360 }
45362 {
45364 {
45366 {
45369 }
45370 else
45371 {
45377 }
45378 }
45383 }
45393 {
45395 {
45399 }
45401 matching_parens parens;
45409 {
45416 {
45420 matching_parens parens2;
45428 {
45440 else
45443 }
45444 }
45445 else
45449 }
45452 {
45453 tree t;
45455 do
45456 {
45459 {
45467 "constant integer expression or string "
45469 else
45471 }
45472 else
45477 else
45479 }
45485 {
45489 }
45490 else
45491 {
45494 }
45497 do
45498 {
45502 {
45505 }
45508 else
45509 {
45513 }
45519 else
45521 }
45527 {
45534 else
45536 }
45537 else
45542 {
45544 "selector may not be specified in "
45547 }
45548 properties
45550 OMP_DECLARE_SIMD_CLAUSE_MASK,
45555 }
45561 }
45565 {
45568 }
45574 else
45576 }
45580 }
45582 /* OpenMP 5.0:
45584 trait-set-selector[,trait-set-selector[,...]]
45586 trait-set-selector:
45587 trait-set-selector-name = { trait-selector[, trait-selector[, ...]] }
45589 trait-set-selector-name:
45590 constructor
45591 device
45592 implementation
45593 user */
45595 static tree
45598 {
45600 do
45601 {
45604 setp
45607 {
45626 }
45628 {
45632 }
45640 matching_braces braces;
45644 tree selectors
45647 {
45650 }
45658 else
45660 }
45666 }
45668 /* Finalize #pragma omp declare variant after a fndecl has been parsed, and put
45669 that into "omp declare variant base" attribute. */
45671 static tree
45673 tree attrs)
45674 {
45675 matching_parens parens;
45677 {
45678 fail:
45681 }
45686 cp_expr varid
45694 tree variant;
45701 else
45702 {
45703 tree ambiguous_decls;
45711 }
45715 {
45717 variant
45725 }
45731 /* For now only in C++ attributes, do it always for OpenMP 5.1. */
45742 {
45745 }
45757 {
45759 match_loc);
45768 }
45773 }
45776 /* Finalize #pragma omp declare simd clauses after direct declarator has
45777 been parsed, and put that into "omp declare simd" attribute. */
45779 static tree
45781 {
45787 {
45792 }
45797 {
45808 {
45809 /* For now only in C++ attributes, do it always for OpenMP 5.1.
45810 if (cp_lexer_next_token_is (parser->lexer, CPP_COMMA)
45811 && cp_lexer_nth_token_is (parser->lexer, 2, CPP_NAME))
45812 cp_lexer_consume_token (parser->lexer); */
45816 pragma_tok);
45824 }
45825 else
45826 {
45828 attrs
45830 }
45832 }
45836 {
45842 {
45844 {
45851 {
45859 else
45862 }
45868 {
45870 "unknown OpenMP directive name in "
45873 }
45877 {
45879 "OpenMP directive other than %<declare simd%> "
45880 "or %<declare variant%> appertains to a "
45883 }
45886 {
45888 "mixing OpenMP directives with attribute and "
45891 }
45896 {
45899 }
45901 cp_token tok = {};
45909 tok = {};
45914 tok = {};
45926 /* Move the current source position to that of the first token
45927 in the new lexer. */
45937 {
45945 pragma_tok);
45949 cl);
45954 }
45955 else
45956 {
45958 attrs
45960 attrs);
45961 }
45964 }
45966 }
45967 else
45969 }
45975 }
45977 /* Helper for cp_parser_omp_declare_target, handle one to or link clause
45978 on #pragma omp declare target. Return false if errors were reported. */
45980 static bool
45982 {
45985 tree id;
45987 {
45990 }
45991 else
45994 {
45996 "%qD specified both in declare target %<link%> and %<to%>"
45999 }
46001 {
46008 {
46011 {
46015 }
46016 }
46017 }
46021 {
46025 {
46028 }
46029 }
46031 {
46035 {
46038 }
46039 }
46041 }
46043 /* OpenMP 4.0:
46044 # pragma omp declare target new-line
46045 declarations and definitions
46046 # pragma omp end declare target new-line
46048 OpenMP 4.5:
46049 # pragma omp declare target ( extended-list ) new-line
46051 # pragma omp declare target declare-target-clauses[seq] new-line */
46053 #define OMP_DECLARE_TARGET_CLAUSE_MASK \
46054 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_TO) \
46055 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_ENTER) \
46056 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_LINK) \
46057 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DEVICE_TYPE))
46059 static void
46061 {
46066 /* For now only in C++ attributes, do it always for OpenMP 5.1. */
46070 clauses
46074 {
46076 clauses);
46079 }
46080 else
46081 {
46082 struct omp_declare_target_attr a
46087 }
46092 {
46105 device_type);
46106 }
46110 }
46112 static void
46114 {
46118 {
46121 }
46123 {
46127 {
46130 }
46133 else
46134 {
46138 }
46139 }
46140 else
46141 {
46145 }
46149 "%<#pragma omp end declare target%> without corresponding "
46151 else
46152 {
46153 omp_declare_target_attr
46156 {
46159 "%<declare target%> in attribute syntax terminated "
46161 else
46163 "%<declare target%> in pragma syntax terminated "
46165 }
46166 }
46167 }
46169 /* Helper function of cp_parser_omp_declare_reduction. Parse the combiner
46170 expression and optional initializer clause of
46171 #pragma omp declare reduction. We store the expression(s) as
46172 either 3, 6 or 7 special statements inside of the artificial function's
46173 body. The first two statements are DECL_EXPRs for the artificial
46174 OMP_OUT resp. OMP_IN variables, followed by a statement with the combiner
46175 expression that uses those variables.
46176 If there was any INITIALIZER clause, this is followed by further statements,
46177 the fourth and fifth statements are DECL_EXPRs for the artificial
46178 OMP_PRIV resp. OMP_ORIG variables. If the INITIALIZER clause wasn't the
46179 constructor variant (first token after open paren is not omp_priv),
46180 then the sixth statement is a statement with the function call expression
46181 that uses the OMP_PRIV and optionally OMP_ORIG variable.
46182 Otherwise, the sixth statement is whatever statement cp_finish_decl emits
46183 to initialize the OMP_PRIV artificial variable and there is seventh
46184 statement, a DECL_EXPR of the OMP_PRIV statement again. */
46186 static bool
46188 {
46200 tree combiner;
46215 /* For now only in C++ attributes, do it always for OpenMP 5.1. */
46223 {
46226 }
46229 {
46231 matching_parens parens;
46237 {
46240 }
46256 {
46260 /* Reject initializer (omp_priv) and initializer (omp_priv ()). */
46264 == CPP_CLOSE_PAREN
46267 {
46271 }
46276 }
46277 else
46278 {
46280 /* Don't create location wrapper nodes here. */
46281 auto_suppress_location_wrappers sentinel;
46296 {
46301 }
46303 tree arg;
46316 }
46329 }
46333 UNKNOWN_LOCATION);
46336 }
46338 /* OpenMP 4.0
46339 #pragma omp declare reduction (reduction-id : typename-list : expression) \
46340 initializer-clause[opt] new-line
46342 initializer-clause:
46343 initializer (omp_priv initializer)
46344 initializer (function-name (argument-list)) */
46346 static void
46349 {
46359 /* Get the high-water mark for the DECLARATOR_OBSTACK. */
46366 {
46398 }
46410 /* Types may not be defined in declare reduction type list. */
46413 parser->type_definition_forbidden_message
46419 saved_colon_doesnt_start_class_def_p
46424 {
46428 ;
46446 else
46451 else
46453 }
46455 /* Restore the saved message. */
46458 parser->colon_doesnt_start_class_def_p
46463 {
46464 fail:
46467 }
46473 {
46474 tree fntype
46477 NULL_TREE);
46494 {
46498 }
46504 {
46507 }
46509 {
46511 {
46517 }
46524 }
46525 else
46526 {
46529 /* We should never meet a matched duplicate decl. */
46531 }
46536 else
46539 {
46542 }
46550 else
46551 {
46555 }
46560 {
46568 }
46576 }
46580 done:
46581 /* Free any declarators allocated. */
46583 }
46585 /* OpenMP 4.0
46586 #pragma omp declare simd declare-simd-clauses[optseq] new-line
46587 #pragma omp declare reduction (reduction-id : typename-list : expression) \
46588 initializer-clause[opt] new-line
46589 #pragma omp declare target new-line
46591 OpenMP 5.0
46592 #pragma omp declare variant (identifier) match (context-selector) */
46594 static bool
46597 {
46599 {
46604 {
46609 }
46611 {
46616 }
46619 {
46622 context);
46624 }
46626 {
46629 }
46631 {
46635 }
46636 }
46641 }
46643 /* OpenMP 5.0
46644 #pragma omp requires clauses[optseq] new-line */
46646 static bool
46648 {
46654 {
46655 /* For now only in C++ attributes, do it always for OpenMP 5.1. */
46664 {
46679 {
46682 matching_parens parens;
46684 {
46686 {
46691 this_req
46694 this_req
46697 this_req
46699 }
46701 {
46703 "expected %<seq_cst%>, %<relaxed%> or "
46706 {
46713 CPP_CLOSE_PAREN))
46716 }
46717 }
46718 else
46725 /*consume_paren=*/
46729 {
46732 }
46733 }
46735 }
46736 else
46737 {
46739 "%<unified_shared_memory%>, "
46740 "%<dynamic_allocators%>, "
46741 "%<reverse_offload%> "
46745 }
46752 {
46754 {
46761 }
46763 {
46767 }
46770 {
46773 this_req
46775 (omp_requires_mask
46777 }
46781 "lexically after first %<atomic%> construct "
46784 omp_requires_mask
46787 }
46788 }
46790 }
46796 }
46799 /* OpenMP 5.1:
46800 #pragma omp nothing new-line */
46802 static void
46804 {
46806 }
46809 /* OpenMP 5.1
46810 #pragma omp error clauses[optseq] new-line */
46812 static bool
46815 {
46824 {
46825 /* For now only in C++ attributes, do it always for OpenMP 5.1. */
46841 };
46849 {
46852 }
46854 {
46859 }
46863 matching_parens parens;
46865 {
46867 {
46871 else
46873 tf_warning_or_error,
46874 LOOKUP_NORMAL);
46875 }
46876 else
46877 {
46879 {
46887 }
46889 {
46894 {
46901 CPP_CLOSE_PAREN))
46904 }
46905 }
46906 else
46908 }
46914 /*consume_paren=*/
46918 {
46920 {
46923 }
46924 else
46926 }
46928 {
46930 {
46933 }
46934 else
46936 }
46937 }
46938 else
46940 }
46950 {
46952 {
46956 }
46957 tree fndecl
46966 }
46973 {
46977 }
46981 else
46985 }
46987 /* OpenMP 4.5:
46988 #pragma omp taskloop taskloop-clause[optseq] new-line
46989 for-loop
46991 #pragma omp taskloop simd taskloop-simd-clause[optseq] new-line
46992 for-loop */
46994 #define OMP_TASKLOOP_CLAUSE_MASK \
46995 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_SHARED) \
46996 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_PRIVATE) \
46997 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_FIRSTPRIVATE) \
46998 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_LASTPRIVATE) \
46999 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DEFAULT) \
47000 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_GRAINSIZE) \
47001 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_NUM_TASKS) \
47002 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_COLLAPSE) \
47003 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_UNTIED) \
47004 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_IF) \
47005 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_FINAL) \
47006 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_MERGEABLE) \
47007 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_NOGROUP) \
47008 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_PRIORITY) \
47009 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_ALLOCATE) \
47010 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_REDUCTION) \
47011 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_IN_REDUCTION))
47013 static tree
47017 {
47024 /* #pragma omp parallel master taskloop{, simd} disallow in_reduction
47025 clause. */
47030 {
47035 {
47059 }
47060 }
47062 {
47065 }
47070 {
47073 }
47080 if_p);
47086 }
47089 /* OpenACC 2.0:
47090 # pragma acc routine oacc-routine-clause[optseq] new-line
47091 function-definition
47093 # pragma acc routine ( name ) oacc-routine-clause[optseq] new-line
47094 */
47096 #define OACC_ROUTINE_CLAUSE_MASK \
47097 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_GANG) \
47098 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_WORKER) \
47099 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_VECTOR) \
47100 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_SEQ) \
47101 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_NOHOST) )
47103 /* Parse the OpenACC routine pragma. This has an optional '( name )'
47104 component, which must resolve to a declared namespace-scope
47105 function. The clauses are either processed directly (for a named
47106 function), or defered until the immediatley following declaration
47107 is parsed. */
47109 static void
47112 {
47114 /* The checking for "another pragma following this one" in the "no optional
47115 '( name )'" case makes sure that we dont re-enter. */
47118 cp_oacc_routine_data data;
47124 /* It is safe to take the address of a local variable; it will only be
47125 used while this scope is live. */
47128 /* Look for optional '( name )'. */
47130 {
47131 matching_parens parens;
47134 /* We parse the name as an id-expression. If it resolves to
47135 anything other than a non-overloaded function at namespace
47136 scope, it's an error. */
47152 {
47156 }
47158 data.clauses
47162 /* The clauses are in reverse order; fix that to make later diagnostic
47163 emission easier. */
47169 {
47174 }
47176 /* Perhaps we should use the same rule as declarations in different
47177 namespaces? */
47179 {
47184 }
47187 {
47191 }
47195 }
47197 {
47198 /* Store away all pragma tokens. */
47206 /* Emit a helpful diagnostic if there's another pragma following this
47207 one. */
47209 {
47212 /* ..., and then just keep going. */
47214 }
47216 /* We only have to consider the pragma_external case here. */
47221 else
47224 }
47225 }
47227 /* Finalize #pragma acc routine clauses after direct declarator has
47228 been parsed. */
47230 static tree
47232 {
47237 {
47239 "%<#pragma acc routine%> not immediately followed by "
47242 }
47258 /* The clauses are in reverse order; fix that to make later diagnostic
47259 emission easier. */
47262 /* Later, cp_finalize_oacc_routine will process the clauses. */
47266 }
47268 /* Apply any saved OpenACC routine clauses to a just-parsed
47269 declaration. */
47271 static void
47273 {
47275 {
47276 /* Keep going if we're in error reporting mode. */
47282 {
47284 {
47286 "%<#pragma acc routine%> not immediately followed by"
47290 }
47294 }
47296 int compatible
47301 {
47304 }
47306 {
47307 }
47308 else
47309 {
47311 {
47320 }
47322 /* Set the routine's level of parallelism. */
47326 /* Add an "omp declare target" attribute. */
47331 }
47332 }
47333 }
47335 /* Main entry point to OpenMP statement pragmas. */
47337 static void
47339 {
47340 tree stmt;
47345 {
47373 if_p);
47393 if_p);
47398 if_p);
47403 if_p);
47408 if_p);
47413 if_p);
47418 if_p);
47430 if_p);
47444 if_p);
47449 if_p);
47453 }
47456 }
47457 \f
47458 /* Transactional Memory parsing routines. */
47460 /* Parse a transaction attribute.
47462 txn-attribute:
47463 attribute
47464 [ [ identifier ] ]
47466 We use this instead of cp_parser_attributes_opt for transactions to avoid
47467 the pedwarn in C++98 mode. */
47469 static tree
47471 {
47486 {
47490 /* For keywords, use the canonical spelling,
47491 not the parsed identifier. */
47495 }
47496 else
47500 error1:
47503 }
47505 /* Parse a __transaction_atomic or __transaction_relaxed statement.
47507 transaction-statement:
47508 __transaction_atomic txn-attribute[opt] txn-noexcept-spec[opt]
47509 compound-statement
47510 __transaction_relaxed txn-noexcept-spec[opt] compound-statement
47511 */
47513 static tree
47515 {
47526 else
47527 {
47531 }
47533 /* Parse a noexcept specification. */
47537 {
47538 /* cancel-and-throw is unimplemented. */
47541 }
47542 else
47544 CP_PARSER_FLAGS_NONE,
47549 /* Keep track if we're in the lexical scope of an outer transaction. */
47561 }
47563 /* Parse a __transaction_atomic or __transaction_relaxed expression.
47565 transaction-expression:
47566 __transaction_atomic txn-noexcept-spec[opt] ( expression )
47567 __transaction_relaxed txn-noexcept-spec[opt] ( expression )
47568 */
47570 static tree
47572 {
47585 keyword == RID_TRANSACTION_RELAXED
47599 /* Set this early. This might mean that we allow transaction_cancel in
47600 an expression that we find out later actually has to be a constexpr.
47601 However, we expect that cxx_constant_value will be able to deal with
47602 this; also, if the noexcept has no constexpr, then what we parse next
47603 really is a transaction's body. */
47606 /* Parse a noexcept specification. */
47608 CP_PARSER_FLAGS_NONE,
47615 {
47616 matching_parens parens;
47623 }
47624 else
47625 {
47626 /* The only expression that is available got parsed for the noexcept
47627 already. noexcept is true then. */
47630 }
47639 }
47641 /* Parse a function-transaction-block.
47643 function-transaction-block:
47644 __transaction_atomic txn-attribute[opt] ctor-initializer[opt]
47645 function-body
47646 __transaction_atomic txn-attribute[opt] function-try-block
47647 __transaction_relaxed ctor-initializer[opt] function-body
47648 __transaction_relaxed function-try-block
47649 */
47651 static void
47653 {
47668 else
47669 {
47673 }
47681 else
47682 cp_parser_ctor_initializer_opt_and_function_body
47688 }
47690 /* Parse a __transaction_cancel statement.
47692 cancel-statement:
47693 __transaction_cancel txn-attribute[opt] ;
47694 __transaction_cancel txn-attribute[opt] throw-expression ;
47696 ??? Cancel and throw is not yet implemented. */
47698 static tree
47700 {
47706 RT_TRANSACTION_CANCEL);
47713 /* ??? Parse cancel-and-throw here. */
47718 {
47722 }
47724 {
47728 }
47730 {
47733 {
47739 }
47740 }
47742 {
47746 }
47752 }
47753 \f
47754 /* The parser. */
47758 \f
47759 /* Special handling for the first token or line in the file. The first
47760 thing in the file might be #pragma GCC pch_preprocess, which loads a
47761 PCH file, which is a GC collection point. So we need to handle this
47762 first pragma without benefit of an existing lexer structure.
47764 Always returns one token to the caller in *FIRST_TOKEN. This is
47765 either the true first token of the file, or the first token after
47766 the initial pragma. */
47768 static void
47770 {
47778 {
47782 }
47784 /* Skip to the end of the pragma. */
47786 {
47789 do
47792 }
47794 /* Now actually load the PCH file. */
47798 /* Read one more token to return to our caller. We have to do this
47799 after reading the PCH file in, since its pointers have to be
47800 live. */
47802 }
47804 /* Parse a pragma GCC ivdep. */
47806 static bool
47808 {
47811 }
47813 /* Parse a pragma GCC unroll. */
47815 static unsigned short
47817 {
47827 {
47829 " assignment-expression that evaluates to a non-negative"
47832 }
47833 else
47834 {
47838 }
47841 }
47843 /* Normal parsing of a pragma token. Here we can (and must) use the
47844 regular lexer. */
47846 static bool
47848 {
47851 tree stmt;
47862 {
47870 {
47881 }
47886 {
47897 }
47902 {
47913 }
47918 {
47930 }
47935 {
47947 }
47952 {
47964 }
47983 {
47989 }
47997 {
48003 }
48011 {
48016 }
48022 {
48028 }
48036 {
48042 }
48083 {
48085 "%<#pragma omp requires%> may only be used at file or "
48089 }
48121 "%<#pragma omp scan%> may only be used in "
48127 "%<#pragma omp section%> may only be used in "
48132 {
48134 {
48138 }
48144 {
48148 }
48149 else
48155 {
48158 }
48161 }
48164 {
48166 {
48170 }
48171 const unsigned short unroll
48177 {
48181 }
48182 else
48188 {
48191 }
48194 }
48201 bad_stmt:
48204 }
48208 }
48210 /* The interface the pragma parsers have to the lexer. */
48212 enum cpp_ttype
48214 {
48226 else
48227 {
48231 }
48234 }
48236 \f
48237 /* External interface. */
48239 /* Parse one entire translation unit. */
48241 void
48243 {
48251 /* cp_lexer_new_main is called before doing any GC allocation
48252 because tokenization might load a PCH file. */
48263 }
48265 /* Create an identifier for a generic parameter type (a synthesized
48266 template parameter implied by `auto' or a concept identifier). */
48269 static tree
48271 {
48275 }
48277 /* Add an implicit template type parameter to the CURRENT_TEMPLATE_PARMS
48278 (creating a new template parameter list if necessary). Returns the newly
48279 created template type parm. */
48281 static tree
48283 {
48284 /* A requires-clause is not a function and cannot have placeholders. */
48286 {
48289 }
48293 /* We are either continuing a function template that already contains implicit
48294 template parameters, creating a new fully-implicit function template, or
48295 extending an existing explicit function template with implicit template
48296 parameters. */
48304 {
48308 }
48309 else
48310 {
48311 /* Roll back to the existing template parameter scope (in the case of
48312 extending an explicit function template) or introduce a new template
48313 parameter scope ahead of the function parameter scope (or class scope
48314 in the case of out-of-line member definitions). The function scope is
48315 added back after template parameter synthesis below. */
48320 {
48323 }
48325 {
48326 /* If not defining a class, then any class scope is a scope level in
48327 an out-of-line member definition. In this case simply wind back
48328 beyond the first such scope to inject the template parameter list.
48329 Otherwise wind back to the class being defined. The latter can
48330 occur in class member friend declarations such as:
48332 class A {
48333 void foo (auto);
48334 };
48335 class B {
48336 friend void A::foo (auto);
48337 };
48339 The template parameter list synthesized for the friend declaration
48340 must be injected in the scope of 'B'. This can also occur in
48341 erroneous cases such as:
48343 struct A {
48344 struct B {
48345 void foo (auto);
48346 };
48347 void B::foo (auto) {}
48348 };
48350 Here the attempted definition of 'B::foo' within 'A' is ill-formed
48351 but, nevertheless, the template parameter list synthesized for the
48352 declarator should be injected into the scope of 'A' as if the
48353 ill-formed template was specified explicitly. */
48356 {
48359 }
48360 }
48366 {
48367 /* Introduce a new template parameter list for implicit template
48368 parameters. */
48372 parser->implicit_template_scope
48379 }
48380 else
48381 {
48382 /* Synthesize implicit template parameters at the end of the explicit
48383 template parameter list. */
48390 parser->implicit_template_parms
48392 }
48393 }
48395 /* Synthesize a new template parameter and track the current template
48396 parameter chain with implicit_template_parms. */
48400 tree synth_tmpl_parm;
48403 /* Synthesize the type template parameter. */
48411 /* Attach the constraint to the parm before processing. */
48414 tree new_parm
48416 input_location,
48417 node,
48421 /* Mark the synthetic declaration "virtual". This is used when
48422 comparing template-heads to determine if whether an abbreviated
48423 function template is equivalent to an explicit template.
48425 Note that DECL_ARTIFICIAL is used elsewhere for template parameters. */
48429 // Chain the new parameter to the list of implicit parameters.
48431 parser->implicit_template_parms
48433 else
48438 /* Return the TEMPLATE_PARM_INDEX, not the PARM_DECL. */
48441 /* If creating a fully implicit function template, start the new implicit
48442 template parameter list with this synthesized type, otherwise grow the
48443 current template parameter list. */
48446 {
48452 }
48453 else
48454 {
48459 }
48461 /* If the new parameter was constrained, we need to add that to the
48462 constraints in the template parameter list. */
48464 {
48468 }
48473 }
48475 /* Finish the declaration of a fully implicit function template. Such a
48476 template has no explicit template parameter list so has not been through the
48477 normal template head and tail processing. synthesize_implicit_template_parm
48478 tries to do the head; this tries to do the tail. MEMBER_DECL_OPT should be
48479 provided if the declaration is a class member such that its template
48480 declaration can be completed. If MEMBER_DECL_OPT is provided the finished
48481 form is returned. Otherwise NULL_TREE is returned. */
48483 static tree
48485 {
48490 {
48494 }
48506 }
48508 /* Like finish_fully_implicit_template, but to be used in error
48509 recovery, rearranging scopes so that we restore the state we had
48510 before synthesize_implicit_template_parm inserted the implement
48511 template parms scope. */
48513 static void
48515 {
48520 {
48529 }
48530 else
48536 }
48538 /* Helper function for diagnostics that have complained about things
48539 being used with 'extern "C"' linkage.
48541 Attempt to issue a note showing where the 'extern "C"' linkage began. */
48543 void
48545 {
48549 }