| blob | 8cfcd150705f5a79e96fdf55ddfa4cf109294f15 |
1 /* -*- C++ -*- Parser.
2 Copyright (C) 2000-2018 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_UNIQUE_PTR
48 \f
49 /* The lexer. */
51 /* The cp_lexer_* routines mediate between the lexer proper (in libcpp
52 and c-lex.c) and the C++ parser. */
55 {
57 };
59 /* The various kinds of non integral constant we encounter. */
61 NIC_NONE,
62 /* floating-point literal */
63 NIC_FLOAT,
64 /* %<this%> */
65 NIC_THIS,
66 /* %<__FUNCTION__%> */
67 NIC_FUNC_NAME,
68 /* %<__PRETTY_FUNCTION__%> */
69 NIC_PRETTY_FUNC,
70 /* %<__func__%> */
71 NIC_C99_FUNC,
72 /* "%<va_arg%> */
73 NIC_VA_ARG,
74 /* a cast */
75 NIC_CAST,
76 /* %<typeid%> operator */
77 NIC_TYPEID,
78 /* non-constant compound literals */
79 NIC_NCC,
80 /* a function call */
81 NIC_FUNC_CALL,
82 /* an increment */
83 NIC_INC,
84 /* an decrement */
85 NIC_DEC,
86 /* an array reference */
87 NIC_ARRAY_REF,
88 /* %<->%> */
89 NIC_ARROW,
90 /* %<.%> */
91 NIC_POINT,
92 /* the address of a label */
93 NIC_ADDR_LABEL,
94 /* %<*%> */
95 NIC_STAR,
96 /* %<&%> */
97 NIC_ADDR,
98 /* %<++%> */
99 NIC_PREINCREMENT,
100 /* %<--%> */
101 NIC_PREDECREMENT,
102 /* %<new%> */
103 NIC_NEW,
104 /* %<delete%> */
105 NIC_DEL,
106 /* calls to overloaded operators */
107 NIC_OVERLOADED,
108 /* an assignment */
109 NIC_ASSIGNMENT,
110 /* a comma operator */
111 NIC_COMMA,
112 /* a call to a constructor */
113 NIC_CONSTRUCTOR,
114 /* a transaction expression */
115 NIC_TRANSACTION
116 };
118 /* The various kinds of errors about name-lookup failing. */
120 /* NULL */
121 NLE_NULL,
122 /* is not a type */
123 NLE_TYPE,
124 /* is not a class or namespace */
125 NLE_CXX98,
126 /* is not a class, namespace, or enumeration */
127 NLE_NOT_CXX98
128 };
130 /* The various kinds of required token */
132 RT_NONE,
154 /* The type is CPP_KEYWORD */
183 RT_TRANSACTION_CANCEL /* __transaction_cancel */
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
250 static void cp_parser_initial_pragma
253 static bool cp_parser_omp_declare_reduction_exprs
255 static void cp_finalize_oacc_routine
258 /* Manifest constants. */
259 #define CP_LEXER_BUFFER_SIZE ((256 * 1024) / sizeof (cp_token))
260 #define CP_SAVED_TOKEN_STACK 5
262 /* Variables. */
264 /* The stream to which debugging output should be written. */
267 /* Nonzero if we are parsing an unevaluated operand: an operand to
268 sizeof, typeof, or alignof. */
271 /* Dump up to NUM tokens in BUFFER to FILE starting with token
272 START_TOKEN. If START_TOKEN is NULL, the dump starts with the
273 first token in BUFFER. If NUM is 0, dump all the tokens. If
274 CURR_TOKEN is set and it is one of the tokens in BUFFER, it will be
275 highlighted by surrounding it in [[ ]]. */
277 static void
281 {
298 {
301 }
306 {
313 nprinted++;
323 {
333 }
334 }
337 {
340 }
343 }
346 /* Dump all tokens in BUFFER to stderr. */
348 void
350 {
352 }
354 DEBUG_FUNCTION void
356 {
358 }
360 DEBUG_FUNCTION void
362 {
365 else
367 }
370 /* Dump the cp_parser tree field T to FILE if T is non-NULL. DESC is the
371 description for T. */
373 static void
375 {
377 {
380 }
381 }
384 /* Dump parser context C to FILE. */
386 static void
388 {
393 }
396 /* Print the stack of parsing contexts to FILE starting with FIRST. */
398 static void
400 {
406 {
409 }
410 }
413 /* Print the value of FLAG to FILE. DESC is a string describing the flag. */
415 static void
417 {
420 }
423 /* Print an unparsed function entry UF to FILE. */
425 static void
427 {
430 tree fn;
435 i++)
436 {
442 }
447 {
450 }
456 {
459 }
461 }
464 /* Print the stack of unparsed member functions S to FILE. */
466 static void
469 {
475 {
478 }
479 }
482 /* Dump the tokens in a window of size WINDOW_SIZE around the next_token for
483 the given PARSER. If FILE is NULL, the output is printed on stderr. */
485 static void
487 {
499 next_token);
500 }
503 /* Dump debugging information for the given PARSER. If FILE is NULL,
504 the output is printed on stderr. */
506 void
508 {
511 expanded_location eloc;
587 }
589 DEBUG_FUNCTION void
591 {
593 }
595 DEBUG_FUNCTION void
597 {
600 else
602 }
604 /* Allocate memory for a new lexer object and return it. */
608 {
613 /* Allocate the memory. */
616 /* Initially we are not debugging. */
621 /* Create the buffer. */
625 }
628 /* Create a new main C++ lexer, the lexer that gets tokens from the
629 preprocessor. */
633 {
635 cp_token token;
637 /* It's possible that parsing the first pragma will load a PCH file,
638 which is a GC collection point. So we have to do that before
639 allocating any memory. */
644 /* Put the first token in the buffer. */
647 /* Get the remaining tokens from the preprocessor. */
649 {
652 }
661 /* Subsequent preprocessor diagnostics should use compiler
662 diagnostic functions to get the compiler source location. */
667 }
669 /* Create a new lexer whose token stream is primed with the tokens in
670 CACHE. When these tokens are exhausted, no new tokens will be read. */
674 {
679 /* We do not own the buffer. */
686 /* Initially we are not debugging. */
691 }
693 /* Frees all resources associated with LEXER. */
695 static void
697 {
701 }
703 /* This needs to be set to TRUE before the lexer-debugging infrastructure can
704 be used. The point of this flag is to help the compiler to fold away calls
705 to cp_lexer_debugging_p within this source file at compile time, when the
706 lexer is not being debugged. */
708 #define LEXER_DEBUGGING_ENABLED_P false
710 /* Returns nonzero if debugging information should be output. */
714 {
719 }
724 {
728 }
732 {
734 }
738 {
740 }
744 {
747 else
749 }
753 {
756 /* Skip past purged tokens. */
758 {
760 tp--;
761 }
764 }
766 /* nonzero if we are presently saving tokens. */
770 {
772 }
774 /* Store the next token from the preprocessor in *TOKEN. Return true
775 if we reach EOF. If LEXER is NULL, assume we are handling an
776 initial #pragma pch_preprocess, and thus want the lexer to return
777 processed strings. */
779 static void
781 {
784 /* Get a new token from the preprocessor. */
785 token->type
792 /* On some systems, some header files are surrounded by an
793 implicit extern "C" block. Set a flag in the token if it
794 comes from such a header. */
799 /* Check to see if this token is a keyword. */
801 {
803 {
804 /* Mark this token as a keyword. */
806 /* Record which keyword. */
808 }
809 else
810 {
814 {
815 /* Warn about the C++0x keyword (but still treat it as
816 an identifier). */
821 /* Clear out the C_RID_CODE so we don't warn about this
822 particular identifier-turned-keyword again. */
824 }
827 }
828 }
830 {
831 /* This only happens in Objective-C++; it must be a keyword. */
834 {
835 /* Replace 'class' with '@class', 'private' with '@private',
836 etc. This prevents confusion with the C++ keyword
837 'class', and makes the tokens consistent with other
838 Objective-C 'AT' keywords. For example '@class' is
839 reported as RID_AT_CLASS which is consistent with
840 '@synchronized', which is reported as
841 RID_AT_SYNCHRONIZED.
842 */
852 }
853 }
854 }
856 /* Update the globals input_location and the input file stack from TOKEN. */
859 {
861 {
863 }
864 }
866 /* Update the globals input_location and the input file stack from LEXER. */
869 {
872 }
874 /* Return a pointer to the next token in the token stream, but do not
875 consume it. */
879 {
881 {
885 }
887 }
889 /* Return true if the next token has the indicated TYPE. */
893 {
895 }
897 /* Return true if the next token does not have the indicated TYPE. */
901 {
903 }
905 /* Return true if the next token is the indicated KEYWORD. */
909 {
911 }
915 {
917 }
921 {
923 }
925 /* Return true if the next token is not the indicated KEYWORD. */
929 {
931 }
933 /* Return true if KEYWORD can start a decl-specifier. */
935 bool
937 {
939 {
940 /* auto specifier: storage-class-specifier in C++,
941 simple-type-specifier in C++0x. */
943 /* Storage classes. */
949 /* Elaborated type specifiers. */
955 /* Simple type specifiers. */
969 /* GNU extensions. */
972 /* C++0x extensions. */
984 }
985 }
987 /* Return true if the next token is a keyword for a decl-specifier. */
989 static bool
991 {
996 }
998 /* Returns TRUE iff the token T begins a decltype type. */
1000 static bool
1002 {
1005 }
1007 /* Returns TRUE iff the next token begins a decltype type. */
1009 static bool
1011 {
1014 }
1016 /* Called when processing a token with tree_check_value; perform or defer the
1017 associated checks and return the value. */
1019 static tree
1021 {
1022 /* Perform any access checks that were deferred. */
1027 {
1033 }
1034 /* Return the stored value. */
1036 }
1038 /* Return a pointer to the Nth token in the token stream. If N is 1,
1039 then this is precisely equivalent to cp_lexer_peek_token (except
1040 that it is not inline). One would like to disallow that case, but
1041 there is one case (cp_parser_nth_token_starts_template_id) where
1042 the caller passes a variable for N and it might be 1. */
1046 {
1049 /* N is 1-based, not zero-based. */
1060 {
1063 {
1066 }
1070 }
1073 {
1076 }
1079 }
1081 /* Return the next token, and advance the lexer's next_token pointer
1082 to point to the next non-purged token. */
1086 {
1092 do
1093 {
1096 {
1099 }
1101 }
1106 /* Provide debugging output. */
1108 {
1112 }
1115 }
1117 /* Permanently remove the next token from the token stream, and
1118 advance the next_token pointer to refer to the next non-purged
1119 token. */
1121 static void
1123 {
1132 do
1133 {
1134 tok++;
1136 {
1139 }
1140 }
1143 }
1145 /* Permanently remove all tokens after TOK, up to, but not
1146 including, the token that will be returned next by
1147 cp_lexer_peek_token. */
1149 static void
1151 {
1160 {
1165 }
1166 }
1168 /* Begin saving tokens. All tokens consumed after this point will be
1169 preserved. */
1171 static void
1173 {
1174 /* Provide debugging output. */
1179 }
1181 /* Commit to the portion of the token stream most recently saved. */
1183 static void
1185 {
1186 /* Provide debugging output. */
1191 }
1193 /* Return all tokens saved since the last call to cp_lexer_save_tokens
1194 to the token stream. Stop saving tokens. */
1196 static void
1198 {
1199 /* Provide debugging output. */
1204 }
1206 /* RAII wrapper around the above functions, with sanity checking. Creating
1207 a variable saves tokens, which are committed when the variable is
1208 destroyed unless they are explicitly rolled back by calling the rollback
1209 member function. */
1211 struct saved_token_sentinel
1212 {
1217 {
1220 }
1222 {
1225 }
1227 {
1231 }
1232 };
1234 /* Print a representation of the TOKEN on the STREAM. */
1236 static void
1238 {
1239 /* We don't use cpp_type2name here because the parser defines
1240 a few tokens of its own. */
1242 /* cpplib-defined token types */
1243 #define OP(e, s) #e,
1244 #define TK(e, s) #e,
1245 TTYPE_TABLE
1246 #undef OP
1247 #undef TK
1248 /* C++ parser token types - see "Manifest constants", above. */
1252 };
1254 /* For some tokens, print the associated data. */
1256 {
1258 /* Some keywords have a value that is not an IDENTIFIER_NODE.
1259 For example, `struct' is mapped to an INTEGER_CST. */
1262 /* fall through */
1280 /* If we have a name for the token, print it out. Otherwise, we
1281 simply give the numeric code. */
1284 else
1287 }
1288 }
1290 DEBUG_FUNCTION void
1292 {
1295 }
1297 DEBUG_FUNCTION void
1299 {
1302 else
1304 }
1307 /* Start emitting debugging information. */
1309 static void
1311 {
1318 }
1320 /* Stop emitting debugging information. */
1322 static void
1324 {
1331 }
1333 /* Create a new cp_token_cache, representing a range of tokens. */
1337 {
1342 }
1344 /* Diagnose if #pragma omp declare simd isn't followed immediately
1345 by function declaration or definition. */
1349 {
1351 {
1355 }
1356 }
1358 /* Finalize #pragma omp declare simd clauses after FNDECL has been parsed,
1359 and put that into "omp declare simd" attribute. */
1363 {
1365 {
1367 {
1370 }
1372 {
1375 }
1376 }
1377 }
1379 /* Diagnose if #pragma acc routine isn't followed immediately by function
1380 declaration or definition. */
1384 {
1386 {
1388 "%<#pragma acc routine%> not immediately followed by "
1391 }
1392 }
1393 \f
1394 /* Decl-specifiers. */
1396 /* Set *DECL_SPECS to represent an empty decl-specifier-seq. */
1398 static void
1400 {
1402 }
1404 /* Declarators. */
1406 /* Nothing other than the parser should be creating declarators;
1407 declarators are a semi-syntactic representation of C++ entities.
1408 Other parts of the front end that need to create entities (like
1409 VAR_DECLs or FUNCTION_DECLs) should do that directly. */
1412 (cp_declarator *, tree, cp_cv_quals, cp_virt_specifiers, cp_ref_qualifier, tree, tree, tree, tree);
1422 /* An erroneous declarator. */
1425 /* The obstack on which declarators and related data structures are
1426 allocated. */
1429 /* Alloc BYTES from the declarator memory pool. */
1433 {
1435 }
1437 /* Allocate a declarator of the indicated KIND. Clear fields that are
1438 common to all declarators. */
1442 {
1455 }
1457 /* Make a declarator for a generalized identifier. If
1458 QUALIFYING_SCOPE is non-NULL, the identifier is
1459 QUALIFYING_SCOPE::UNQUALIFIED_NAME; otherwise, it is just
1460 UNQUALIFIED_NAME. SFK indicates the kind of special function this
1461 is, if any. */
1465 special_function_kind sfk)
1466 {
1469 /* It is valid to write:
1471 class C { void f(); };
1472 typedef C D;
1473 void D::f();
1475 The standard is not clear about whether `typedef const C D' is
1476 legal; as of 2002-09-15 the committee is considering that
1477 question. EDG 3.0 allows that syntax. Therefore, we do as
1478 well. */
1492 }
1494 /* Make a declarator for a pointer to TARGET. CV_QUALIFIERS is a list
1495 of modifiers such as const or volatile to apply to the pointer
1496 type, represented as identifiers. ATTRIBUTES represent the attributes that
1497 appertain to the pointer or reference. */
1499 cp_declarator *
1501 tree attributes)
1502 {
1510 {
1514 }
1515 else
1521 }
1523 /* Like make_pointer_declarator -- but for references. ATTRIBUTES
1524 represent the attributes that appertain to the pointer or
1525 reference. */
1527 cp_declarator *
1530 {
1538 {
1542 }
1543 else
1549 }
1551 /* Like make_pointer_declarator -- but for a pointer to a non-static
1552 member of CLASS_TYPE. ATTRIBUTES represent the attributes that
1553 appertain to the pointer or reference. */
1555 cp_declarator *
1558 tree attributes)
1559 {
1568 {
1571 }
1572 else
1578 }
1580 /* Make a declarator for the function given by TARGET, with the
1581 indicated PARMS. The CV_QUALIFIERS apply to the function, as in
1582 "const"-qualified member function. The EXCEPTION_SPECIFICATION
1583 indicates what exceptions can be thrown. */
1585 cp_declarator *
1587 tree parms,
1588 cp_cv_quals cv_qualifiers,
1589 cp_virt_specifiers virt_specifiers,
1590 cp_ref_qualifier ref_qualifier,
1591 tree tx_qualifier,
1592 tree exception_specification,
1593 tree late_return_type,
1594 tree requires_clause)
1595 {
1609 {
1613 }
1614 else
1618 }
1620 /* Make a declarator for an array of BOUNDS elements, each of which is
1621 defined by ELEMENT. */
1623 cp_declarator *
1625 {
1632 {
1636 }
1637 else
1641 }
1643 /* Determine whether the declarator we've seen so far can be a
1644 parameter pack, when followed by an ellipsis. */
1645 static bool
1647 {
1649 /* We already saw an ellipsis. */
1652 /* Search for a declarator name, or any other declarator that goes
1653 after the point where the ellipsis could appear in a parameter
1654 pack. If we find any of these, then this declarator can not be
1655 made into a parameter pack. */
1658 {
1660 {
1673 }
1674 }
1677 }
1681 /* Create a parameter declarator with the indicated DECL_SPECIFIERS,
1682 DECLARATOR and DEFAULT_ARGUMENT. */
1684 cp_parameter_declarator *
1687 tree default_argument,
1688 location_t loc,
1690 {
1698 else
1706 }
1708 /* Returns true iff DECLARATOR is a declaration for a function. */
1710 static bool
1712 {
1714 {
1723 }
1725 }
1727 /* The parser. */
1729 /* Overview
1730 --------
1732 A cp_parser parses the token stream as specified by the C++
1733 grammar. Its job is purely parsing, not semantic analysis. For
1734 example, the parser breaks the token stream into declarators,
1735 expressions, statements, and other similar syntactic constructs.
1736 It does not check that the types of the expressions on either side
1737 of an assignment-statement are compatible, or that a function is
1738 not declared with a parameter of type `void'.
1740 The parser invokes routines elsewhere in the compiler to perform
1741 semantic analysis and to build up the abstract syntax tree for the
1742 code processed.
1744 The parser (and the template instantiation code, which is, in a
1745 way, a close relative of parsing) are the only parts of the
1746 compiler that should be calling push_scope and pop_scope, or
1747 related functions. The parser (and template instantiation code)
1748 keeps track of what scope is presently active; everything else
1749 should simply honor that. (The code that generates static
1750 initializers may also need to set the scope, in order to check
1751 access control correctly when emitting the initializers.)
1753 Methodology
1754 -----------
1756 The parser is of the standard recursive-descent variety. Upcoming
1757 tokens in the token stream are examined in order to determine which
1758 production to use when parsing a non-terminal. Some C++ constructs
1759 require arbitrary look ahead to disambiguate. For example, it is
1760 impossible, in the general case, to tell whether a statement is an
1761 expression or declaration without scanning the entire statement.
1762 Therefore, the parser is capable of "parsing tentatively." When the
1763 parser is not sure what construct comes next, it enters this mode.
1764 Then, while we attempt to parse the construct, the parser queues up
1765 error messages, rather than issuing them immediately, and saves the
1766 tokens it consumes. If the construct is parsed successfully, the
1767 parser "commits", i.e., it issues any queued error messages and
1768 the tokens that were being preserved are permanently discarded.
1769 If, however, the construct is not parsed successfully, the parser
1770 rolls back its state completely so that it can resume parsing using
1771 a different alternative.
1773 Future Improvements
1774 -------------------
1776 The performance of the parser could probably be improved substantially.
1777 We could often eliminate the need to parse tentatively by looking ahead
1778 a little bit. In some places, this approach might not entirely eliminate
1779 the need to parse tentatively, but it might still speed up the average
1780 case. */
1782 /* Flags that are passed to some parsing functions. These values can
1783 be bitwise-ored together. */
1785 enum
1786 {
1787 /* No flags. */
1789 /* The construct is optional. If it is not present, then no error
1790 should be issued. */
1792 /* When parsing a type-specifier, treat user-defined type-names
1793 as non-type identifiers. */
1795 /* When parsing a type-specifier, do not try to parse a class-specifier
1796 or enum-specifier. */
1798 /* When parsing a decl-specifier-seq, only allow type-specifier or
1799 constexpr. */
1801 /* When parsing a decl-specifier-seq, only allow mutable or constexpr. */
1803 };
1805 /* This type is used for parameters and variables which hold
1806 combinations of the above flags. */
1809 /* The different kinds of declarators we want to parse. */
1811 enum cp_parser_declarator_kind
1812 {
1813 /* We want an abstract declarator. */
1814 CP_PARSER_DECLARATOR_ABSTRACT,
1815 /* We want a named declarator. */
1816 CP_PARSER_DECLARATOR_NAMED,
1817 /* We don't mind, but the name must be an unqualified-id. */
1818 CP_PARSER_DECLARATOR_EITHER
1819 };
1821 /* The precedence values used to parse binary expressions. The minimum value
1822 of PREC must be 1, because zero is reserved to quickly discriminate
1823 binary operators from other tokens. */
1825 enum cp_parser_prec
1826 {
1827 PREC_NOT_OPERATOR,
1828 PREC_LOGICAL_OR_EXPRESSION,
1829 PREC_LOGICAL_AND_EXPRESSION,
1830 PREC_INCLUSIVE_OR_EXPRESSION,
1831 PREC_EXCLUSIVE_OR_EXPRESSION,
1832 PREC_AND_EXPRESSION,
1833 PREC_EQUALITY_EXPRESSION,
1834 PREC_RELATIONAL_EXPRESSION,
1835 PREC_SHIFT_EXPRESSION,
1836 PREC_ADDITIVE_EXPRESSION,
1837 PREC_MULTIPLICATIVE_EXPRESSION,
1838 PREC_PM_EXPRESSION,
1839 NUM_PREC_VALUES = PREC_PM_EXPRESSION
1840 };
1842 /* A mapping from a token type to a corresponding tree node type, with a
1843 precedence value. */
1845 struct cp_parser_binary_operations_map_node
1846 {
1847 /* The token type. */
1849 /* The corresponding tree code. */
1851 /* The precedence of this operator. */
1853 };
1855 struct cp_parser_expression_stack_entry
1856 {
1857 /* Left hand side of the binary operation we are currently
1858 parsing. */
1859 cp_expr lhs;
1860 /* Original tree code for left hand side, if it was a binary
1861 expression itself (used for -Wparentheses). */
1863 /* Tree code for the binary operation we are parsing. */
1865 /* Precedence of the binary operation we are parsing. */
1867 /* Location of the binary operation we are parsing. */
1868 location_t loc;
1869 };
1871 /* The stack for storing partial expressions. We only need NUM_PREC_VALUES
1872 entries because precedence levels on the stack are monotonically
1873 increasing. */
1877 /* Prototypes. */
1879 /* Constructors and destructors. */
1884 /* Class variables. */
1888 /* The operator-precedence table used by cp_parser_binary_expression.
1889 Transformed into an associative array (binops_by_token) by
1890 cp_parser_new. */
1923 };
1925 /* The same as binops, but initialized by cp_parser_new so that
1926 binops_by_token[N].token_type == N. Used in cp_parser_binary_expression
1927 for speed. */
1930 /* Constructors and destructors. */
1932 /* Construct a new context. The context below this one on the stack
1933 is given by NEXT. */
1937 {
1940 /* Allocate the storage. */
1942 {
1943 /* Pull the first entry from the free list. */
1947 }
1948 else
1951 /* No errors have occurred yet in this context. */
1953 /* If this is not the bottommost context, copy information that we
1954 need from the previous context. */
1956 {
1957 /* If, in the NEXT context, we are parsing an `x->' or `x.'
1958 expression, then we are parsing one in this context, too. */
1960 /* Thread the stack. */
1962 }
1965 }
1967 /* Managing the unparsed function queues. */
1969 #define unparsed_funs_with_default_args \
1970 parser->unparsed_queues->last ().funs_with_default_args
1971 #define unparsed_funs_with_definitions \
1972 parser->unparsed_queues->last ().funs_with_definitions
1973 #define unparsed_nsdmis \
1974 parser->unparsed_queues->last ().nsdmis
1975 #define unparsed_classes \
1976 parser->unparsed_queues->last ().classes
1978 static void
1980 {
1983 }
1985 static void
1987 {
1990 }
1992 /* Prototypes. */
1994 /* Constructors and destructors. */
1999 /* Routines to parse various constructs.
2001 Those that return `tree' will return the error_mark_node (rather
2002 than NULL_TREE) if a parse error occurs, unless otherwise noted.
2003 Sometimes, they will return an ordinary node if error-recovery was
2004 attempted, even though a parse error occurred. So, to check
2005 whether or not a parse error occurred, you should always use
2006 cp_parser_error_occurred. If the construct is optional (indicated
2007 either by an `_opt' in the name of the function that does the
2008 parsing or via a FLAGS parameter), then NULL_TREE is returned if
2009 the construct is not present. */
2011 /* Lexical conventions [gram.lex] */
2013 static cp_expr cp_parser_identifier
2015 static cp_expr cp_parser_string_literal
2017 static cp_expr cp_parser_userdef_char_literal
2019 static tree cp_parser_userdef_string_literal
2021 static cp_expr cp_parser_userdef_numeric_literal
2024 /* Basic concepts [gram.basic] */
2026 static bool cp_parser_translation_unit
2029 /* Expressions [gram.expr] */
2031 static cp_expr cp_parser_primary_expression
2033 static cp_expr cp_parser_id_expression
2035 static cp_expr cp_parser_unqualified_id
2037 static tree cp_parser_nested_name_specifier_opt
2039 static tree cp_parser_nested_name_specifier
2041 static tree cp_parser_qualifying_entity
2043 static cp_expr cp_parser_postfix_expression
2045 static tree cp_parser_postfix_open_square_expression
2047 static tree cp_parser_postfix_dot_deref_expression
2052 /* Values for the second parameter of cp_parser_parenthesized_expression_list. */
2054 static void cp_parser_pseudo_destructor_name
2056 static cp_expr cp_parser_unary_expression
2058 static enum tree_code cp_parser_unary_operator
2060 static tree cp_parser_new_expression
2064 static tree cp_parser_new_type_id
2072 static tree cp_parser_delete_expression
2074 static cp_expr cp_parser_cast_expression
2076 static cp_expr cp_parser_binary_expression
2078 static tree cp_parser_question_colon_clause
2080 static cp_expr cp_parser_assignment_expression
2082 static enum tree_code cp_parser_assignment_operator_opt
2084 static cp_expr cp_parser_expression
2086 static cp_expr cp_parser_constant_expression
2088 static cp_expr cp_parser_builtin_offsetof
2090 static cp_expr cp_parser_lambda_expression
2092 static void cp_parser_lambda_introducer
2094 static bool cp_parser_lambda_declarator_opt
2096 static void cp_parser_lambda_body
2099 /* Statements [gram.stmt.stmt] */
2101 static void cp_parser_statement
2103 static void cp_parser_label_for_labeled_statement
2105 static tree cp_parser_expression_statement
2107 static tree cp_parser_compound_statement
2109 static void cp_parser_statement_seq_opt
2111 static tree cp_parser_selection_statement
2113 static tree cp_parser_condition
2115 static tree cp_parser_iteration_statement
2117 static bool cp_parser_init_statement
2119 static tree cp_parser_for
2121 static tree cp_parser_c_for
2123 static tree cp_parser_range_for
2125 static void do_range_for_auto_deduction
2127 static tree cp_parser_perform_range_for_lookup
2129 static tree cp_parser_range_for_member_function
2131 static tree cp_parser_jump_statement
2133 static void cp_parser_declaration_statement
2136 static tree cp_parser_implicitly_scoped_statement
2138 static void cp_parser_already_scoped_statement
2141 /* Declarations [gram.dcl.dcl] */
2143 static void cp_parser_declaration_seq_opt
2145 static void cp_parser_declaration
2147 static void cp_parser_block_declaration
2149 static void cp_parser_simple_declaration
2151 static void cp_parser_decl_specifier_seq
2153 static tree cp_parser_storage_class_specifier_opt
2155 static tree cp_parser_function_specifier_opt
2157 static tree cp_parser_type_specifier
2160 static tree cp_parser_simple_type_specifier
2162 static tree cp_parser_type_name
2164 static tree cp_parser_type_name
2166 static tree cp_parser_nonclass_name
2168 static tree cp_parser_elaborated_type_specifier
2170 static tree cp_parser_enum_specifier
2172 static void cp_parser_enumerator_list
2174 static void cp_parser_enumerator_definition
2176 static tree cp_parser_namespace_name
2178 static void cp_parser_namespace_definition
2180 static void cp_parser_namespace_body
2182 static tree cp_parser_qualified_namespace_specifier
2184 static void cp_parser_namespace_alias_definition
2186 static bool cp_parser_using_declaration
2188 static void cp_parser_using_directive
2190 static tree cp_parser_alias_declaration
2192 static void cp_parser_asm_definition
2194 static void cp_parser_linkage_specification
2196 static void cp_parser_static_assert
2198 static tree cp_parser_decltype
2200 static tree cp_parser_decomposition_declaration
2203 /* Declarators [gram.dcl.decl] */
2205 static tree cp_parser_init_declarator
2212 static enum tree_code cp_parser_ptr_operator
2214 static cp_cv_quals cp_parser_cv_qualifier_seq_opt
2216 static cp_virt_specifiers cp_parser_virt_specifier_seq_opt
2218 static cp_ref_qualifier cp_parser_ref_qualifier_opt
2220 static tree cp_parser_tx_qualifier_opt
2222 static tree cp_parser_late_return_type_opt
2224 static tree cp_parser_declarator_id
2226 static tree cp_parser_type_id
2228 static tree cp_parser_template_type_arg
2231 static tree cp_parser_type_id_1
2233 static void cp_parser_type_specifier_seq
2235 static tree cp_parser_parameter_declaration_clause
2237 static tree cp_parser_parameter_declaration_list
2241 static tree cp_parser_default_argument
2243 static void cp_parser_function_body
2245 static tree cp_parser_initializer
2247 static cp_expr cp_parser_initializer_clause
2249 static cp_expr cp_parser_braced_list
2254 static void cp_parser_ctor_initializer_opt_and_function_body
2257 static tree cp_parser_late_parsing_omp_declare_simd
2260 static tree cp_parser_late_parsing_oacc_routine
2263 static tree synthesize_implicit_template_parm
2265 static tree finish_fully_implicit_template
2267 static void abort_fully_implicit_template
2270 /* Classes [gram.class] */
2272 static tree cp_parser_class_name
2274 static tree cp_parser_class_specifier
2276 static tree cp_parser_class_head
2278 static enum tag_types cp_parser_class_key
2280 static void cp_parser_type_parameter_key
2282 static void cp_parser_member_specification_opt
2284 static void cp_parser_member_declaration
2286 static tree cp_parser_pure_specifier
2288 static tree cp_parser_constant_initializer
2291 /* Derived classes [gram.class.derived] */
2293 static tree cp_parser_base_clause
2295 static tree cp_parser_base_specifier
2298 /* Special member functions [gram.special] */
2300 static tree cp_parser_conversion_function_id
2302 static tree cp_parser_conversion_type_id
2306 static void cp_parser_ctor_initializer_opt
2308 static void cp_parser_mem_initializer_list
2310 static tree cp_parser_mem_initializer
2312 static tree cp_parser_mem_initializer_id
2315 /* Overloading [gram.over] */
2317 static cp_expr cp_parser_operator_function_id
2319 static cp_expr cp_parser_operator
2322 /* Templates [gram.temp] */
2324 static void cp_parser_template_declaration
2326 static tree cp_parser_template_parameter_list
2328 static tree cp_parser_template_parameter
2330 static tree cp_parser_type_parameter
2332 static tree cp_parser_template_id
2334 static tree cp_parser_template_name
2336 static tree cp_parser_template_argument_list
2338 static tree cp_parser_template_argument
2340 static void cp_parser_explicit_instantiation
2342 static void cp_parser_explicit_specialization
2345 /* Exception handling [gram.exception] */
2347 static tree cp_parser_try_block
2349 static void cp_parser_function_try_block
2351 static void cp_parser_handler_seq
2353 static void cp_parser_handler
2355 static tree cp_parser_exception_declaration
2357 static tree cp_parser_throw_expression
2359 static tree cp_parser_exception_specification_opt
2361 static tree cp_parser_type_id_list
2364 /* GNU Extensions */
2366 static tree cp_parser_asm_specification_opt
2368 static tree cp_parser_asm_operand_list
2370 static tree cp_parser_asm_clobber_list
2372 static tree cp_parser_asm_label_list
2374 static bool cp_next_tokens_can_be_attribute_p
2376 static bool cp_next_tokens_can_be_gnu_attribute_p
2378 static bool cp_next_tokens_can_be_std_attribute_p
2380 static bool cp_nth_tokens_can_be_std_attribute_p
2382 static bool cp_nth_tokens_can_be_gnu_attribute_p
2384 static bool cp_nth_tokens_can_be_attribute_p
2386 static tree cp_parser_attributes_opt
2388 static tree cp_parser_gnu_attributes_opt
2390 static tree cp_parser_gnu_attribute_list
2392 static tree cp_parser_std_attribute
2394 static tree cp_parser_std_attribute_spec
2396 static tree cp_parser_std_attribute_spec_seq
2398 static size_t cp_parser_skip_attributes_opt
2400 static bool cp_parser_extension_opt
2402 static void cp_parser_label_declaration
2405 /* Concept Extensions */
2407 static tree cp_parser_requires_clause
2409 static tree cp_parser_requires_clause_opt
2411 static tree cp_parser_requires_expression
2413 static tree cp_parser_requirement_parameter_list
2415 static tree cp_parser_requirement_body
2417 static tree cp_parser_requirement_list
2419 static tree cp_parser_requirement
2421 static tree cp_parser_simple_requirement
2423 static tree cp_parser_compound_requirement
2425 static tree cp_parser_type_requirement
2427 static tree cp_parser_nested_requirement
2430 /* Transactional Memory Extensions */
2432 static tree cp_parser_transaction
2434 static tree cp_parser_transaction_expression
2436 static void cp_parser_function_transaction
2438 static tree cp_parser_transaction_cancel
2442 pragma_external,
2443 pragma_member,
2444 pragma_objc_icode,
2445 pragma_stmt,
2446 pragma_compound
2447 };
2448 static bool cp_parser_pragma
2451 /* Objective-C++ Productions */
2453 static tree cp_parser_objc_message_receiver
2455 static tree cp_parser_objc_message_args
2457 static tree cp_parser_objc_message_expression
2459 static cp_expr cp_parser_objc_encode_expression
2461 static tree cp_parser_objc_defs_expression
2463 static tree cp_parser_objc_protocol_expression
2465 static tree cp_parser_objc_selector_expression
2467 static cp_expr cp_parser_objc_expression
2469 static bool cp_parser_objc_selector_p
2471 static tree cp_parser_objc_selector
2473 static tree cp_parser_objc_protocol_refs_opt
2475 static void cp_parser_objc_declaration
2477 static tree cp_parser_objc_statement
2479 static bool cp_parser_objc_valid_prefix_attributes
2481 static void cp_parser_objc_at_property_declaration
2483 static void cp_parser_objc_at_synthesize_declaration
2485 static void cp_parser_objc_at_dynamic_declaration
2487 static tree cp_parser_objc_struct_declaration
2490 /* Utility Routines */
2492 static cp_expr cp_parser_lookup_name
2494 static tree cp_parser_lookup_name_simple
2496 static tree cp_parser_maybe_treat_template_as_class
2498 static bool cp_parser_check_declarator_template_parameters
2500 static bool cp_parser_check_template_parameters
2502 static cp_expr cp_parser_simple_cast_expression
2504 static tree cp_parser_global_scope_opt
2506 static bool cp_parser_constructor_declarator_p
2508 static tree cp_parser_function_definition_from_specifiers_and_declarator
2510 static tree cp_parser_function_definition_after_declarator
2512 static bool cp_parser_template_declaration_after_export
2514 static void cp_parser_perform_template_parameter_access_checks
2516 static tree cp_parser_single_declaration
2518 static cp_expr cp_parser_functional_cast
2520 static tree cp_parser_save_member_function_body
2522 static tree cp_parser_save_nsdmi
2524 static tree cp_parser_enclosed_template_argument_list
2526 static void cp_parser_save_default_args
2528 static void cp_parser_late_parsing_for_member
2530 static tree cp_parser_late_parse_one_default_arg
2532 static void cp_parser_late_parsing_nsdmi
2534 static void cp_parser_late_parsing_default_args
2536 static tree cp_parser_sizeof_operand
2538 static cp_expr cp_parser_trait_expr
2540 static bool cp_parser_declares_only_class_p
2542 static void cp_parser_set_storage_class
2544 static void cp_parser_set_decl_spec_type
2546 static void set_and_check_decl_spec_loc
2549 static bool cp_parser_friend_p
2551 static void cp_parser_required_error
2557 static bool cp_parser_token_starts_function_definition_p
2559 static bool cp_parser_next_token_starts_class_definition_p
2561 static bool cp_parser_next_token_ends_template_argument_p
2563 static bool cp_parser_nth_token_starts_template_argument_list_p
2565 static enum tag_types cp_parser_token_is_class_key
2567 static enum tag_types cp_parser_token_is_type_parameter_key
2569 static void cp_parser_check_class_key
2571 static void cp_parser_check_access_in_redeclaration
2573 static bool cp_parser_optional_template_keyword
2575 static void cp_parser_pre_parsed_nested_name_specifier
2577 static bool cp_parser_cache_group
2579 static tree cp_parser_cache_defarg
2581 static void cp_parser_parse_tentatively
2583 static void cp_parser_commit_to_tentative_parse
2585 static void cp_parser_commit_to_topmost_tentative_parse
2587 static void cp_parser_abort_tentative_parse
2589 static bool cp_parser_parse_definitely
2593 static bool cp_parser_uncommitted_to_tentative_parse_p
2595 static void cp_parser_error
2597 static void cp_parser_name_lookup_error
2599 static bool cp_parser_simulate_error
2601 static bool cp_parser_check_type_definition
2603 static void cp_parser_check_for_definition_in_return_type
2605 static void cp_parser_check_for_invalid_template_id
2607 static bool cp_parser_non_integral_constant_expression
2609 static void cp_parser_diagnose_invalid_type_name
2611 static bool cp_parser_parse_and_diagnose_invalid_type_name
2613 static int cp_parser_skip_to_closing_parenthesis
2615 static void cp_parser_skip_to_end_of_statement
2617 static void cp_parser_consume_semicolon_at_end_of_statement
2619 static void cp_parser_skip_to_end_of_block_or_statement
2621 static bool cp_parser_skip_to_closing_brace
2623 static void cp_parser_skip_to_end_of_template_parameter_list
2625 static void cp_parser_skip_to_pragma_eol
2627 static bool cp_parser_error_occurred
2629 static bool cp_parser_allow_gnu_extensions_p
2631 static bool cp_parser_is_pure_string_literal
2633 static bool cp_parser_is_string_literal
2635 static bool cp_parser_is_keyword
2637 static tree cp_parser_make_typename_type
2641 static bool cp_parser_compound_literal_p
2643 static bool cp_parser_array_designator_p
2645 static bool cp_parser_init_statement_p
2647 static bool cp_parser_skip_to_closing_square_bracket
2650 /* Concept-related syntactic transformations */
2655 // -------------------------------------------------------------------------- //
2656 // Unevaluated Operand Guard
2657 //
2658 // Implementation of an RAII helper for unevaluated operand parsing.
2660 {
2663 }
2666 {
2669 }
2671 // -------------------------------------------------------------------------- //
2672 // Tentative Parsing
2674 /* Returns nonzero if we are parsing tentatively. */
2678 {
2680 }
2682 /* Returns nonzero if TOKEN is a string literal. */
2684 static bool
2686 {
2692 }
2694 /* Returns nonzero if TOKEN is a string literal
2695 of a user-defined string literal. */
2697 static bool
2699 {
2706 }
2708 /* Returns nonzero if TOKEN is the indicated KEYWORD. */
2710 static bool
2712 {
2714 }
2716 /* Return TOKEN's pragma_kind if it is CPP_PRAGMA, otherwise
2717 PRAGMA_NONE. */
2719 static enum pragma_kind
2721 {
2724 /* We smuggled the cpp_token->u.pragma value in an INTEGER_CST. */
2726 }
2728 /* Helper function for cp_parser_error.
2729 Having peeked a token of kind TOK1_KIND that might signify
2730 a conflict marker, peek successor tokens to determine
2731 if we actually do have a conflict marker.
2732 Specifically, we consider a run of 7 '<', '=' or '>' characters
2733 at the start of a line as a conflict marker.
2734 These come through the lexer as three pairs and a single,
2735 e.g. three CPP_LSHIFT tokens ("<<") and a CPP_LESS token ('<').
2736 If it returns true, *OUT_LOC is written to with the location/range
2737 of the marker. */
2739 static bool
2742 {
2753 /* It must be at the start of the line. */
2758 /* We have a conflict marker. Construct a location of the form:
2759 <<<<<<<
2760 ^~~~~~~
2761 with start == caret, finishing at the end of the marker. */
2766 }
2768 /* Get a description of the matching symbol to TOKEN_DESC e.g. "(" for
2769 RT_CLOSE_PAREN. */
2773 {
2775 {
2783 }
2784 }
2786 /* Attempt to convert TOKEN_DESC from a required_token to an
2787 enum cpp_ttype, returning CPP_EOF if there is no good conversion. */
2789 static enum cpp_ttype
2791 {
2793 {
2814 /* Use CPP_EOF as a "no completions possible" code. */
2816 }
2817 }
2820 /* Subroutine of cp_parser_error and cp_parser_required_error.
2822 Issue a diagnostic of the form
2823 FILE:LINE: MESSAGE before TOKEN
2824 where TOKEN is the next token in the input stream. MESSAGE
2825 (specified by the caller) is usually of the form "expected
2826 OTHER-TOKEN".
2828 This bypasses the check for tentative passing, and potentially
2829 adds material needed by cp_parser_required_error.
2831 If MISSING_TOKEN_DESC is not RT_NONE, then potentially add fix-it hints
2832 suggesting insertion of the missing token.
2834 Additionally, if MATCHING_LOCATION is not UNKNOWN_LOCATION, then we
2835 have an unmatched symbol at MATCHING_LOCATION; highlight this secondary
2836 location. */
2838 static void
2840 required_token missing_token_desc,
2841 location_t matching_location)
2842 {
2844 /* This diagnostic makes more sense if it is tagged to the line
2845 of the token we just peeked at. */
2849 {
2854 }
2856 /* If this is actually a conflict marker, report it as such. */
2860 {
2861 location_t loc;
2863 {
2866 /* Consume tokens until the end of the source line. */
2868 {
2878 }
2880 }
2881 }
2888 {
2889 /* Potentially supply a fix-it hint, suggesting to add the
2890 missing token immediately after the *previous* token.
2891 This may move the primary location within richloc. */
2893 location_t prev_token_loc
2897 /* If matching_location != UNKNOWN_LOCATION, highlight it.
2898 Attempt to consolidate diagnostics by printing it as a
2899 secondary range within the main diagnostic. */
2901 added_matching_location
2903 }
2905 /* Actually emit the error. */
2907 /* Because c_parser_error does not understand
2908 CPP_KEYWORD, keywords are treated like
2909 identifiers. */
2914 {
2915 /* If we weren't able to consolidate matching_location, then
2916 print it as a secondary diagnostic. */
2921 }
2922 }
2924 /* If not parsing tentatively, issue a diagnostic of the form
2925 FILE:LINE: MESSAGE before TOKEN
2926 where TOKEN is the next token in the input stream. MESSAGE
2927 (specified by the caller) is usually of the form "expected
2928 OTHER-TOKEN". */
2930 static void
2932 {
2935 }
2937 /* Issue an error about name-lookup failing. NAME is the
2938 IDENTIFIER_NODE DECL is the result of
2939 the lookup (as returned from cp_parser_lookup_name). DESIRED is
2940 the thing that we hoped to find. */
2942 static void
2944 tree name,
2945 tree decl,
2946 name_lookup_error desired,
2947 location_t location)
2948 {
2949 /* If name lookup completely failed, tell the user that NAME was not
2950 declared. */
2952 {
2965 else
2967 }
2969 {
2971 {
2988 }
2989 }
2991 {
2993 {
3003 name);
3007 }
3008 }
3009 else
3010 {
3012 {
3025 }
3026 }
3027 }
3029 /* If we are parsing tentatively, remember that an error has occurred
3030 during this tentative parse. Returns true if the error was
3031 simulated; false if a message should be issued by the caller. */
3033 static bool
3035 {
3037 {
3040 }
3042 }
3044 /* This function is called when a type is defined. If type
3045 definitions are forbidden at this point, an error message is
3046 issued. */
3048 static bool
3050 {
3051 /* If types are forbidden here, issue a message. */
3053 {
3054 /* Don't use `%s' to print the string, because quotations (`%<', `%>')
3055 in the message need to be interpreted. */
3058 }
3060 }
3062 /* This function is called when the DECLARATOR is processed. The TYPE
3063 was a type defined in the decl-specifiers. If it is invalid to
3064 define a type in the decl-specifiers for DECLARATOR, an error is
3065 issued. TYPE_LOCATION is the location of TYPE and is used
3066 for error reporting. */
3068 static void
3071 {
3072 /* [dcl.fct] forbids type definitions in return types.
3073 Unfortunately, it's not easy to know whether or not we are
3074 processing a return type until after the fact. */
3082 {
3087 type);
3088 }
3089 }
3091 /* A type-specifier (TYPE) has been parsed which cannot be followed by
3092 "<" in any valid C++ program. If the next token is indeed "<",
3093 issue a message warning the user about what appears to be an
3094 invalid attempt to form a template-id. LOCATION is the location
3095 of the type-specifier (TYPE) */
3097 static void
3099 tree type,
3101 location_t location)
3102 {
3106 {
3112 {
3115 else
3117 }
3118 else
3120 /* Remember the location of the invalid "<". */
3123 /* Consume the "<". */
3125 /* Parse the template arguments. */
3127 /* Permanently remove the invalid template arguments so that
3128 this error message is not issued again. */
3131 }
3132 }
3134 /* If parsing an integral constant-expression, issue an error message
3135 about the fact that THING appeared and return true. Otherwise,
3136 return false. In either case, set
3137 PARSER->NON_INTEGRAL_CONSTANT_EXPRESSION_P. */
3139 static bool
3141 non_integral_constant thing)
3142 {
3145 {
3147 {
3150 {
3153 "ISO C++ forbids using a floating-point literal "
3158 "enumeration type cannot appear in a "
3249 }
3253 }
3254 }
3256 }
3258 /* Emit a diagnostic for an invalid type name. This function commits
3259 to the current active tentative parse, if any. (Otherwise, the
3260 problematic construct might be encountered again later, resulting
3261 in duplicate error messages.) LOCATION is the location of ID. */
3263 static void
3265 location_t location)
3266 {
3269 /* Try to lookup the identifier. */
3276 /* If the lookup was ambiguous, an error will already have
3277 been issued. */
3279 /* If the lookup found a template-name, it means that the user forgot
3280 to specify an argument list. Emit a useful error message. */
3282 {
3285 decl);
3290 }
3294 /* Something like 'unsigned A a;' */
3297 {
3298 /* Issue an error message. */
3299 name_hint hint;
3303 {
3309 }
3310 else
3312 /* If we're in a template class, it's possible that the user was
3313 referring to a type from a base class. For example:
3315 template <typename T> struct A { typedef T X; };
3316 template <typename T> struct B : public A<T> { X x; };
3318 The user should have said "typename A<T>::X". */
3334 {
3335 tree b;
3338 b;
3340 {
3344 {
3345 tree field;
3346 /* Go from a particular instantiation of the
3347 template (which will have an empty TYPE_FIELDs),
3348 to the main version. */
3351 field;
3355 {
3360 }
3363 }
3364 }
3365 }
3366 }
3367 /* Here we diagnose qualified-ids where the scope is actually correct,
3368 but the identifier does not resolve to a valid type name. */
3370 {
3372 {
3381 else
3390 }
3393 {
3394 /* A<T>::A<T>() */
3400 }
3403 {
3406 "need %<typename%> before %<%T::%D::%E%> because "
3410 id,
3413 else
3417 }
3419 {
3431 else
3437 }
3438 else
3440 }
3441 }
3443 /* Check for a common situation where a type-name should be present,
3444 but is not, and issue a sensible error message. Returns true if an
3445 invalid type-name was detected.
3447 The situation handled by this function are variable declarations of the
3448 form `ID a', where `ID' is an id-expression and `a' is a plain identifier.
3449 Usually, `ID' should name a type, but if we got here it means that it
3450 does not. We try to emit the best possible error message depending on
3451 how exactly the id-expression looks like. */
3453 static bool
3455 {
3456 tree id;
3459 /* Avoid duplicate error about ambiguous lookup. */
3461 {
3465 }
3474 /* If the next token is a (, this is a function with no explicit return
3475 type, i.e. constructor, destructor or conversion op. */
3478 {
3481 }
3485 /* Emit a diagnostic for the invalid type. */
3487 out:
3488 /* If we aren't in the middle of a declarator (i.e. in a
3489 parameter-declaration-clause), skip to the end of the declaration;
3490 there's no point in trying to process it. */
3494 }
3496 /* Consume tokens up to, and including, the next non-nested closing `)'.
3497 Returns 1 iff we found a closing `)'. RECOVERING is true, if we
3498 are doing error recovery. Returns -1 if OR_TTYPE is not CPP_EOF and we
3499 found an unnested token of that type. */
3501 static int
3504 cpp_ttype or_ttype,
3506 {
3517 {
3520 /* Have we found what we're looking for before the closing paren? */
3526 {
3529 /* If we've run out of tokens, then there is no closing `)'. */
3532 /* This is good for lambda expression capture-lists. */
3542 /* This matches the processing in skip_to_end_of_statement. */
3562 {
3566 }
3576 condop_depth--;
3581 }
3583 /* Consume the token. */
3585 }
3586 }
3588 /* Consume tokens up to, and including, the next non-nested closing `)'.
3589 Returns 1 iff we found a closing `)'. RECOVERING is true, if we
3590 are doing error recovery. Returns -1 if OR_COMMA is true and we
3591 found an unnested token of that type. */
3593 static int
3598 {
3602 }
3604 /* Consume tokens until we reach the end of the current statement.
3605 Normally, that will be just before consuming a `;'. However, if a
3606 non-nested `}' comes first, then we stop before consuming that. */
3608 static void
3610 {
3613 /* Unwind generic function template scope if necessary. */
3618 {
3622 {
3625 /* If we've run out of tokens, stop. */
3629 /* If the next token is a `;', we have reached the end of the
3630 statement. */
3636 /* If this is a non-nested '}', stop before consuming it.
3637 That way, when confronted with something like:
3639 { 3 + }
3641 we stop before consuming the closing '}', even though we
3642 have not yet reached a `;'. */
3646 /* If it is the closing '}' for a block that we have
3647 scanned, stop -- but only after consuming the token.
3648 That way given:
3650 void f g () { ... }
3651 typedef int I;
3653 we will stop after the body of the erroneously declared
3654 function, but before consuming the following `typedef'
3655 declaration. */
3657 {
3660 }
3669 }
3671 /* Consume the token. */
3673 }
3674 }
3676 /* This function is called at the end of a statement or declaration.
3677 If the next token is a semicolon, it is consumed; otherwise, error
3678 recovery is attempted. */
3680 static void
3682 {
3683 /* Look for the trailing `;'. */
3685 {
3686 /* If there is additional (erroneous) input, skip to the end of
3687 the statement. */
3689 /* If the next token is now a `;', consume it. */
3692 }
3693 }
3695 /* Skip tokens until we have consumed an entire block, or until we
3696 have consumed a non-nested `;'. */
3698 static void
3700 {
3703 /* Unwind generic function template scope if necessary. */
3708 {
3712 {
3715 /* If we've run out of tokens, stop. */
3719 /* Stop if this is an unnested ';'. */
3725 /* Stop if this is an unnested '}', or closes the outermost
3726 nesting level. */
3727 nesting_depth--;
3735 /* Nest. */
3736 nesting_depth++;
3741 }
3743 /* Consume the token. */
3745 }
3746 }
3748 /* Skip tokens until a non-nested closing curly brace is the next
3749 token, or there are no more tokens. Return true in the first case,
3750 false otherwise. */
3752 static bool
3754 {
3758 {
3762 {
3765 /* If we've run out of tokens, stop. */
3769 /* If the next token is a non-nested `}', then we have reached
3770 the end of the current block. */
3776 /* If it the next token is a `{', then we are entering a new
3777 block. Consume the entire block. */
3783 }
3785 /* Consume the token. */
3787 }
3788 }
3790 /* Consume tokens until we reach the end of the pragma. The PRAGMA_TOK
3791 parameter is the PRAGMA token, allowing us to purge the entire pragma
3792 sequence. */
3794 static void
3796 {
3801 do
3805 /* Ensure that the pragma is not parsed again. */
3807 }
3809 /* Require pragma end of line, resyncing with it as necessary. The
3810 arguments are as for cp_parser_skip_to_pragma_eol. */
3812 static void
3814 {
3818 }
3820 /* This is a simple wrapper around make_typename_type. When the id is
3821 an unresolved identifier node, we can provide a superior diagnostic
3822 using cp_parser_diagnose_invalid_type_name. */
3824 static tree
3826 location_t id_location)
3827 {
3828 tree result;
3830 {
3836 }
3838 }
3840 /* This is a wrapper around the
3841 make_{pointer,ptrmem,reference}_declarator functions that decides
3842 which one to call based on the CODE and CLASS_TYPE arguments. The
3843 CODE argument should be one of the values returned by
3844 cp_parser_ptr_operator. ATTRIBUTES represent the attributes that
3845 appertain to the pointer or reference. */
3849 cp_cv_quals cv_qualifiers,
3851 tree attributes)
3852 {
3859 else
3869 }
3871 /* Create a new C++ parser. */
3875 {
3880 /* cp_lexer_new_main is called before doing GC allocation because
3881 cp_lexer_new_main might load a PCH file. */
3884 /* Initialize the binops_by_token so that we can get the tree
3885 directly from the token. */
3893 /* For now, we always accept GNU extensions. */
3896 /* The `>' token is a greater-than operator, not the end of a
3897 template-id. */
3902 /* We are not parsing a constant-expression. */
3907 /* Local variable names are not forbidden. */
3910 /* We are not processing an `extern "C"' declaration. */
3913 /* We are not processing a declarator. */
3916 /* We are not processing a template-argument-list. */
3919 /* We are not in an iteration statement. */
3922 /* We are not in a switch statement. */
3925 /* We are not parsing a type-id inside an expression. */
3928 /* Declarations aren't implicitly extern "C". */
3931 /* String literals should be translated to the execution character set. */
3934 /* We are not parsing a function body. */
3937 /* We can correct until told otherwise. */
3940 /* The unparsed function queue is empty. */
3943 /* There are no classes being defined. */
3946 /* No template parameters apply. */
3949 /* Special parsing data structures. */
3953 /* Not declaring an implicit function template. */
3959 /* Allow constrained-type-specifiers. */
3962 /* We haven't yet seen an 'extern "C"'. */
3966 }
3968 /* Create a cp_lexer structure which will emit the tokens in CACHE
3969 and push it onto the parser's lexer stack. This is used for delayed
3970 parsing of in-class method bodies and default arguments, and should
3971 not be confused with tentative parsing. */
3972 static void
3974 {
3979 /* Move the current source position to that of the first token in the
3980 new lexer. */
3982 }
3984 /* Pop the top lexer off the parser stack. This is never used for the
3985 "main" lexer, only for those pushed by cp_parser_push_lexer_for_tokens. */
3986 static void
3988 {
3993 /* Put the current source position back where it was before this
3994 lexer was pushed. */
3996 }
3998 /* Lexical conventions [gram.lex] */
4000 /* Parse an identifier. Returns an IDENTIFIER_NODE representing the
4001 identifier. */
4003 static cp_expr
4005 {
4008 /* Look for the identifier. */
4010 /* Return the value. */
4013 else
4015 }
4017 /* Parse a sequence of adjacent string constants. Returns a
4018 TREE_STRING representing the combined, nul-terminated string
4019 constant. If TRANSLATE is true, translate the string to the
4020 execution character set. If WIDE_OK is true, a wide string is
4021 invalid here.
4023 C++98 [lex.string] says that if a narrow string literal token is
4024 adjacent to a wide string literal token, the behavior is undefined.
4025 However, C99 6.4.5p4 says that this results in a wide string literal.
4026 We follow C99 here, for consistency with the C front end.
4028 This code is largely lifted from lex_string() in c-lex.c.
4030 FUTURE: ObjC++ will need to handle @-strings here. */
4031 static cp_expr
4034 {
4035 tree value;
4042 tree string_tree;
4048 {
4051 }
4056 {
4060 }
4061 else
4062 {
4065 }
4068 /* Try to avoid the overhead of creating and destroying an obstack
4069 for the common case of just one string. */
4072 {
4080 {
4084 }
4085 else
4089 }
4090 else
4091 {
4096 do
4097 {
4099 count++;
4104 {
4107 {
4110 }
4113 {
4118 }
4120 }
4121 else
4125 {
4129 {
4133 "unsupported non-standard concatenation "
4135 }
4136 }
4144 {
4148 }
4149 else
4150 {
4154 }
4155 }
4158 /* A string literal built by concatenation has its caret=start at
4159 the start of the initial string, and its finish at the finish of
4160 the final string literal. */
4164 }
4167 {
4170 }
4174 {
4179 {
4194 }
4199 {
4204 else
4206 }
4207 }
4208 else
4209 /* cpp_interpret_string has issued an error. */
4216 }
4218 /* Look up a literal operator with the name and the exact arguments. */
4220 static tree
4222 {
4223 tree decl;
4229 {
4235 {
4238 {
4248 }
4251 /* May be this should be sufficient_parms_p instead,
4252 depending on how exactly should user-defined literals
4253 work in presence of default arguments on the literal
4254 operator parameters. */
4257 }
4258 }
4261 }
4263 /* Parse a user-defined char constant. Returns a call to a user-defined
4264 literal operator taking the character as an argument. */
4266 static cp_expr
4268 {
4276 /* Build up a call to the user-defined operator */
4277 /* Lookup the name we got back from the id-expression. */
4282 {
4287 }
4291 }
4293 /* A subroutine of cp_parser_userdef_numeric_literal to
4294 create a char... template parameter pack from a string node. */
4296 static tree
4298 {
4299 tree charvec;
4305 /* Fill in CHARVEC with all of the parameters. */
4308 {
4317 }
4319 /* Build the argument packs. */
4325 }
4327 /* A subroutine of cp_parser_userdef_numeric_literal to
4328 create a char... template parameter pack from a string node. */
4330 static tree
4332 {
4333 tree charvec;
4344 /* First template parm is character type. */
4347 /* Fill in CHARVEC with all of the parameters. */
4354 /* Build the argument packs. */
4360 }
4362 /* Parse a user-defined numeric constant. returns a call to a user-defined
4363 literal operator. */
4365 static cp_expr
4367 {
4378 /* Look for a literal operator taking the exact type of numeric argument
4379 as the literal value. */
4384 {
4386 tf_warning_or_error);
4389 {
4392 long_long_unsigned_type_node);
4393 }
4394 else
4395 {
4399 long_double_type_node);
4403 }
4407 }
4410 /* If the numeric argument didn't work, look for a raw literal
4411 operator taking a const char* argument consisting of the number
4412 in string format. */
4417 {
4419 tf_warning_or_error);
4422 }
4425 /* If the raw literal didn't work, look for a non-type template
4426 function with parameter pack char.... Call the function with
4427 template parameter characters representing the number. */
4431 {
4434 {
4436 num_string);
4438 }
4441 tf_warning_or_error);
4444 }
4448 /* In C++14 the standard library defines complex number suffixes that
4449 conflict with GNU extensions. Prefer them if <complex> is #included. */
4459 {
4464 {
4465 /* No <complex>, so pedwarn and use GNU semantics. */
4468 }
4469 }
4471 bool complained
4478 {
4480 "(from <complex>) to enable the C++14 user-defined literal "
4485 }
4492 else
4493 {
4494 /* Use the built-in semantics. */
4495 tree type;
4497 {
4500 else
4502 }
4511 }
4514 /* Avoid repeated diagnostics. */
4517 }
4519 /* Parse a user-defined string constant. Returns a call to a user-defined
4520 literal operator taking a character pointer and the length of the string
4521 as arguments. */
4523 static tree
4525 {
4534 /* Build up a call to the user-defined operator. */
4535 /* Lookup the name we got back from the id-expression. */
4542 {
4544 tf_warning_or_error);
4547 }
4550 /* Look for a template function with typename parameter CharT
4551 and parameter pack CharT... Call the function with
4552 template parameter characters representing the string. */
4556 {
4560 tf_warning_or_error);
4563 }
4569 }
4572 /* Basic concepts [gram.basic] */
4574 /* Parse a translation-unit.
4576 translation-unit:
4577 declaration-seq [opt]
4579 Returns TRUE if all went well. */
4581 static bool
4583 {
4584 /* The address of the first non-permanent object on the declarator
4585 obstack. */
4590 /* Create the declarator obstack, if necessary. */
4592 {
4594 /* Create the error declarator. */
4596 /* Create the empty parameter list. */
4598 UNKNOWN_LOCATION);
4599 /* Remember where the base of the declarator obstack lies. */
4601 }
4605 /* If there are no tokens left then all went well. */
4607 {
4608 /* Get rid of the token array; we don't need it any more. */
4612 /* This file might have been a context that's implicitly extern
4613 "C". If so, pop the lang context. (Only relevant for PCH.) */
4615 {
4618 }
4620 /* Finish up. */
4624 }
4625 else
4626 {
4629 }
4631 /* Make sure the declarator obstack was fully cleaned up. */
4635 /* All went well. */
4637 }
4639 /* Return the appropriate tsubst flags for parsing, possibly in N3276
4640 decltype context. */
4644 {
4649 }
4651 /* We're about to parse a collection of statements. If we're currently
4652 parsing tentatively, set up a firewall so that any nested
4653 cp_parser_commit_to_tentative_parse won't affect the current context. */
4655 static cp_token_position
4657 {
4664 }
4666 /* We've finished parsing the collection of statements. Wrap up the
4667 firewall and replace the relevant tokens with the parsed form. */
4669 static void
4671 tree expr)
4672 {
4676 /* Finish the firewall level. */
4678 /* And remember the result of the parse for when we try again. */
4684 }
4686 /* Like the above functions, but let the user modify the tokens. Used by
4687 CPP_DECLTYPE and CPP_TEMPLATE_ID, where we are saving the side-effects for
4688 later parses, so it makes sense to localize the effects of
4689 cp_parser_commit_to_tentative_parse. */
4691 struct tentative_firewall
4692 {
4697 {
4698 /* If we're currently parsing tentatively, start a committed level as a
4699 firewall and then an inner tentative parse. */
4701 {
4705 }
4706 }
4709 {
4711 {
4712 /* Finish the inner tentative parse and the firewall, propagating any
4713 uncommitted error state to the outer tentative parse. */
4719 }
4720 }
4721 };
4723 /* Some tokens naturally come in pairs e.g.'(' and ')'.
4724 This class is for tracking such a matching pair of symbols.
4725 In particular, it tracks the location of the first token,
4726 so that if the second token is missing, we can highlight the
4727 location of the first token when notifying the user about the
4728 problem. */
4731 class token_pair
4732 {
4734 /* token_pair's ctor. */
4737 /* If the next token is the opening symbol for this pair, consume it and
4738 return true.
4739 Otherwise, issue an error and return false.
4740 In either case, record the location of the opening token. */
4743 {
4747 }
4749 /* Consume the next token from PARSER, recording its location as
4750 that of the opening token within the pair. */
4753 {
4758 }
4760 /* If the next token is the closing symbol for this pair, consume it
4761 and return it.
4762 Otherwise, issue an error, highlighting the location of the
4763 corresponding opening token, and return NULL. */
4766 {
4769 m_open_loc);
4770 }
4773 location_t m_open_loc;
4774 };
4776 /* Traits for token_pair<T> for tracking matching pairs of parentheses. */
4778 struct matching_paren_traits
4779 {
4784 };
4786 /* "matching_parens" is a token_pair<T> class for tracking matching
4787 pairs of parentheses. */
4791 /* Traits for token_pair<T> for tracking matching pairs of braces. */
4793 struct matching_brace_traits
4794 {
4799 };
4801 /* "matching_braces" is a token_pair<T> class for tracking matching
4802 pairs of braces. */
4807 /* Parse a GNU statement-expression, i.e. ({ stmts }), except for the
4808 enclosing parentheses. */
4810 static cp_expr
4812 {
4815 /* Consume the '('. */
4817 matching_parens parens;
4819 /* Start the statement-expression. */
4821 /* Parse the compound-statement. */
4823 /* Finish up. */
4825 /* Consume the ')'. */
4833 }
4835 /* Expressions [gram.expr] */
4837 /* Parse a fold-operator.
4839 fold-operator:
4840 - * / % ^ & | = < > << >>
4841 = -= *= /= %= ^= &= |= <<= >>=
4842 == != <= >= && || , .* ->*
4844 This returns the tree code corresponding to the matched operator
4845 as an int. When the current token matches a compound assignment
4846 opertor, the resulting tree code is the negative value of the
4847 non-assignment operator. */
4849 static int
4851 {
4853 {
4893 }
4894 }
4896 /* Returns true if CODE indicates a binary expression, which is not allowed in
4897 the LHS of a fold-expression. More codes will need to be added to use this
4898 function in other contexts. */
4900 static bool
4902 {
4904 {
4937 }
4938 }
4940 /* If the next token is a suitable fold operator, consume it and return as
4941 the function above. */
4943 static int
4945 {
4951 }
4953 /* Parse a fold-expression.
4955 fold-expression:
4956 ( ... folding-operator cast-expression)
4957 ( cast-expression folding-operator ... )
4958 ( cast-expression folding operator ... folding-operator cast-expression)
4960 Note that the '(' and ')' are matched in primary expression. */
4962 static cp_expr
4964 {
4965 cp_id_kind pidk;
4967 // Left fold.
4969 {
4973 {
4976 }
4983 }
4988 {
4991 }
4994 {
4997 }
5000 /* The operands of a fold-expression are cast-expressions, so binary or
5001 conditional expressions are not allowed. We check this here to avoid
5002 tentative parsing. */
5014 // Right fold.
5019 {
5022 }
5025 // Binary left or right fold.
5030 }
5032 /* Parse a primary-expression.
5034 primary-expression:
5035 literal
5036 this
5037 ( expression )
5038 id-expression
5039 lambda-expression (C++11)
5041 GNU Extensions:
5043 primary-expression:
5044 ( compound-statement )
5045 __builtin_va_arg ( assignment-expression , type-id )
5046 __builtin_offsetof ( type-id , offsetof-expression )
5048 C++ Extensions:
5049 __has_nothrow_assign ( type-id )
5050 __has_nothrow_constructor ( type-id )
5051 __has_nothrow_copy ( type-id )
5052 __has_trivial_assign ( type-id )
5053 __has_trivial_constructor ( type-id )
5054 __has_trivial_copy ( type-id )
5055 __has_trivial_destructor ( type-id )
5056 __has_virtual_destructor ( type-id )
5057 __is_abstract ( type-id )
5058 __is_base_of ( type-id , type-id )
5059 __is_class ( type-id )
5060 __is_empty ( type-id )
5061 __is_enum ( type-id )
5062 __is_final ( type-id )
5063 __is_literal_type ( type-id )
5064 __is_pod ( type-id )
5065 __is_polymorphic ( type-id )
5066 __is_std_layout ( type-id )
5067 __is_trivial ( type-id )
5068 __is_union ( type-id )
5070 Objective-C++ Extension:
5072 primary-expression:
5073 objc-expression
5075 literal:
5076 __null
5078 ADDRESS_P is true iff this expression was immediately preceded by
5079 "&" and therefore might denote a pointer-to-member. CAST_P is true
5080 iff this expression is the target of a cast. TEMPLATE_ARG_P is
5081 true iff this expression is a template argument.
5083 Returns a representation of the expression. Upon return, *IDK
5084 indicates what kind of id-expression (if any) was present. */
5086 static cp_expr
5093 {
5096 /* Assume the primary expression is not an id-expression. */
5099 /* Peek at the next token. */
5102 {
5103 /* literal:
5104 integer-literal
5105 character-literal
5106 floating-literal
5107 string-literal
5108 boolean-literal
5109 pointer-literal
5110 user-defined-literal */
5122 {
5126 }
5127 /* Floating-point literals are only allowed in an integral
5128 constant expression if they are cast to an integral or
5129 enumeration type. */
5133 {
5134 /* CAST_P will be set even in invalid code like "int(2.7 +
5135 ...)". Therefore, we have to check that the next token
5136 is sure to end the cast. */
5138 {
5143 enumerator-definition. */
5145 /* The curly brace at the end of an enum-specifier. */
5147 /* The end of a statement. */
5149 /* The end of the cast-expression. */
5151 /* The end of an array bound. */
5153 /* The closing ">" in a template-argument-list. */
5156 /* C++0x only: A ">>" treated like two ">" tokens,
5157 in a template-argument-list. */
5162 }
5164 /* If we are within a cast, then the constraint that the
5165 cast is to an integral or enumeration type will be
5166 checked at that point. If we are not within a cast, then
5167 this code is invalid. */
5170 }
5190 /* ??? Should wide strings be allowed when parser->translate_strings_p
5191 is false (i.e. in attributes)? If not, we can kill the third
5192 argument to cp_parser_string_literal. */
5198 /* If we see `( { ' then we are looking at the beginning of
5199 a GNU statement-expression. */
5202 {
5203 /* Statement-expressions are not allowed by the standard. */
5207 /* And they're not allowed outside of a function-body; you
5208 cannot, for example, write:
5210 int i = ({ int j = 3; j + 1; });
5212 at class or namespace scope. */
5215 {
5217 "statement-expressions are not allowed outside "
5223 }
5224 else
5226 }
5227 /* Otherwise it's a normal parenthesized expression. */
5228 {
5229 cp_expr expr;
5234 /* Consume the `('. */
5235 matching_parens parens;
5237 /* Within a parenthesized expression, a `>' token is always
5238 the greater-than operator. */
5239 saved_greater_than_is_operator_p
5244 /* Left fold expression. */
5246 else
5247 /* Parse the parenthesized expression. */
5252 {
5259 }
5260 else
5261 /* Let the front end know that this expression was
5262 enclosed in parentheses. This matters in case, for
5263 example, the expression is of the form `A::B', since
5264 `&A::B' might be a pointer-to-member, but `&(A::B)' is
5265 not. */
5268 /* DR 705: Wrapping an unqualified name in parentheses
5269 suppresses arg-dependent lookup. We want to pass back
5270 CP_ID_KIND_QUALIFIED for suppressing vtable lookup
5271 (c++/37862), but none of the others. */
5275 /* The `>' token might be the end of a template-id or
5276 template-parameter-list now. */
5277 parser->greater_than_is_operator_p
5280 /* Consume the `)'. */
5289 }
5292 {
5294 {
5295 /* We might have an Objective-C++ message. */
5298 /* If that works out, we're done ... */
5301 /* ... else, fall though to see if it's a lambda. */
5302 }
5304 /* Don't warn about a failed tentative parse. */
5309 }
5313 /* We have an Objective-C++ string literal. */
5320 {
5321 /* These two are the boolean literals. */
5329 /* The `__null' literal. */
5334 /* The `nullptr' literal. */
5339 /* Recognize the `this' keyword. */
5343 {
5347 }
5348 /* Pointers cannot appear in constant-expressions. */
5353 /* The `operator' keyword can be the beginning of an
5354 id-expression. */
5361 {
5362 non_integral_constant name;
5364 /* The symbols __FUNCTION__, __PRETTY_FUNCTION__, and
5365 __func__ are the names of variables -- but they are
5366 treated specially. Therefore, they are handled here,
5367 rather than relying on the generic id-expression logic
5368 below. Grammatically, these names are id-expressions.
5370 Consume the token. */
5374 {
5386 }
5391 /* Look up the name. */
5393 }
5396 {
5397 tree expression;
5398 tree type;
5399 source_location type_location;
5400 location_t start_loc
5402 /* The `__builtin_va_arg' construct is used to handle
5403 `va_arg'. Consume the `__builtin_va_arg' token. */
5405 /* Look for the opening `('. */
5406 matching_parens parens;
5408 /* Now, parse the assignment-expression. */
5410 /* Look for the `,'. */
5413 /* Parse the type-id. */
5414 {
5417 }
5418 /* Look for the closing `)'. */
5419 location_t finish_loc
5422 /* Using `va_arg' in a constant-expression is not
5423 allowed. */
5425 NIC_VA_ARG))
5427 /* Construct a location of the form:
5428 __builtin_va_arg (v, int)
5429 ~~~~~~~~~~~~~~~~~~~~~^~~~
5430 with the caret at the type, ranging from the start of the
5431 "__builtin_va_arg" token to the close paren. */
5432 location_t combined_loc
5435 }
5470 // C++ concepts
5474 /* Objective-C++ expressions. */
5484 {
5489 }
5490 /* FALLTHRU */
5494 }
5496 /* An id-expression can start with either an identifier, a
5497 `::' as the beginning of a qualified-id, or the "operator"
5498 keyword. */
5503 {
5504 id_expression:
5505 cp_expr id_expression;
5506 cp_expr decl;
5512 /* Parse the id-expression. */
5513 id_expression
5530 /* If we have a template-id, then no further lookup is
5531 required. If the template-id was for a template-class, we
5532 will sometimes have a TYPE_DECL at this point. */
5536 /* Look up the name. */
5537 else
5538 {
5539 tree ambiguous_decls;
5541 /* If we already know that this lookup is ambiguous, then
5542 we've already issued an error message; there's no reason
5543 to check again. */
5546 {
5549 }
5552 none_type,
5553 template_p,
5558 /* If the lookup was ambiguous, an error will already have
5559 been issued. */
5563 /* In Objective-C++, we may have an Objective-C 2.0
5564 dot-syntax for classes here. */
5569 {
5570 tree component;
5577 component);
5578 /* Build a location of the form:
5579 expr.component
5580 ~~~~~^~~~~~~~~
5581 with caret at the start of the component name (at
5582 input_location), ranging from the start of the id_expression
5583 to the end of the component name. */
5584 location_t combined_loc
5589 }
5591 /* In Objective-C++, an instance variable (ivar) may be preferred
5592 to whatever cp_parser_lookup_name() found.
5593 Call objc_lookup_ivar. To avoid exposing cp_expr to the
5594 rest of c-family, we have to do a little extra work to preserve
5595 any location information in cp_expr "decl". Given that
5596 objc_lookup_ivar is implemented in "c-family" and "objc", we
5597 have a trip through the pure "tree" type, rather than cp_expr.
5598 Naively copying it back to "decl" would implicitly give the
5599 new cp_expr value an UNKNOWN_LOCATION for nodes that don't
5600 store an EXPR_LOCATION. Hence we only update "decl" (and
5601 hence its location_t) if we get back a different tree node. */
5603 id_expression);
5607 /* If name lookup gives us a SCOPE_REF, then the
5608 qualifying scope was dependent. */
5610 {
5611 /* At this point, we do not know if DECL is a valid
5612 integral constant expression. We assume that it is
5613 in fact such an expression, so that code like:
5615 template <int N> struct A {
5616 int a[B<N>::i];
5617 };
5619 is accepted. At template-instantiation time, we
5620 will check that B<N>::i is actually a constant. */
5622 }
5623 /* Check to see if DECL is a local variable in a context
5624 where that is forbidden. */
5627 {
5632 }
5633 }
5637 /* It's too difficult to mark ths in all the places where
5638 we know for sure we need to keep the lookup, so do it
5639 now. The cost is extra GC to recycle the lookups
5640 resolved at parse time. */
5643 decl = (finish_id_expression
5645 idk,
5650 template_arg_p,
5657 }
5659 /* Anything else is an error. */
5663 }
5664 }
5672 {
5675 }
5677 /* Parse an id-expression.
5679 id-expression:
5680 unqualified-id
5681 qualified-id
5683 qualified-id:
5684 :: [opt] nested-name-specifier template [opt] unqualified-id
5685 :: identifier
5686 :: operator-function-id
5687 :: template-id
5689 Return a representation of the unqualified portion of the
5690 identifier. Sets PARSER->SCOPE to the qualifying scope if there is
5691 a `::' or nested-name-specifier.
5693 Often, if the id-expression was a qualified-id, the caller will
5694 want to make a SCOPE_REF to represent the qualified-id. This
5695 function does not do this in order to avoid wastefully creating
5696 SCOPE_REFs when they are not required.
5698 If TEMPLATE_KEYWORD_P is true, then we have just seen the
5699 `template' keyword.
5701 If CHECK_DEPENDENCY_P is false, then names are looked up inside
5702 uninstantiated templates.
5704 If *TEMPLATE_P is non-NULL, it is set to true iff the
5705 `template' keyword is used to explicitly indicate that the entity
5706 named is a template.
5708 If DECLARATOR_P is true, the id-expression is appearing as part of
5709 a declarator, rather than as part of an expression. */
5711 static cp_expr
5718 {
5722 /* Assume the `template' keyword was not used. */
5726 /* Look for the optional `::' operator. */
5727 global_scope_p
5728 = (!template_keyword_p
5733 /* Look for the optional nested-name-specifier. */
5734 nested_name_specifier_p
5737 check_dependency_p,
5739 declarator_p,
5740 template_keyword_p)
5743 /* If there is a nested-name-specifier, then we are looking at
5744 the first qualified-id production. */
5746 {
5747 tree saved_scope;
5748 tree saved_object_scope;
5749 tree saved_qualifying_scope;
5750 cp_expr unqualified_id;
5753 /* See if the next token is the `template' keyword. */
5757 /* Name lookup we do during the processing of the
5758 unqualified-id might obliterate SCOPE. */
5762 /* Process the final unqualified-id. */
5764 check_dependency_p,
5765 declarator_p,
5767 /* Restore the SAVED_SCOPE for our caller. */
5773 }
5774 /* Otherwise, if we are in global scope, then we are looking at one
5775 of the other qualified-id productions. */
5777 {
5779 tree id;
5781 /* Peek at the next token. */
5784 /* If it's an identifier, and the next token is not a "<", then
5785 we can avoid the template-id case. This is an optimization
5786 for this common case. */
5788 && !cp_parser_nth_token_starts_template_argument_list_p
5793 /* Try a template-id. */
5797 none_type,
5798 declarator_p);
5799 /* If that worked, we're done. */
5803 /* Peek at the next token. (Changes in the token buffer may
5804 have invalidated the pointer obtained above.) */
5808 {
5815 /* Fall through. */
5820 }
5821 }
5822 else
5825 declarator_p,
5826 optional_p);
5827 }
5829 /* Parse an unqualified-id.
5831 unqualified-id:
5832 identifier
5833 operator-function-id
5834 conversion-function-id
5835 ~ class-name
5836 template-id
5838 If TEMPLATE_KEYWORD_P is TRUE, we have just seen the `template'
5839 keyword, in a construct like `A::template ...'.
5841 Returns a representation of unqualified-id. For the `identifier'
5842 production, an IDENTIFIER_NODE is returned. For the `~ class-name'
5843 production a BIT_NOT_EXPR is returned; the operand of the
5844 BIT_NOT_EXPR is an IDENTIFIER_NODE for the class-name. For the
5845 other productions, see the documentation accompanying the
5846 corresponding parsing functions. If CHECK_DEPENDENCY_P is false,
5847 names are looked up in uninstantiated templates. If DECLARATOR_P
5848 is true, the unqualified-id is appearing as part of a declarator,
5849 rather than as part of an expression. */
5851 static cp_expr
5857 {
5860 /* Peek at the next token. */
5864 {
5866 {
5867 tree id;
5869 /* We don't know yet whether or not this will be a
5870 template-id. */
5872 /* Try a template-id. */
5874 check_dependency_p,
5875 none_type,
5876 declarator_p);
5877 /* If it worked, we're done. */
5880 /* Otherwise, it's an ordinary identifier. */
5882 }
5886 check_dependency_p,
5887 none_type,
5888 declarator_p);
5891 {
5892 tree type_decl;
5893 tree qualifying_scope;
5894 tree object_scope;
5895 tree scope;
5898 /* Consume the `~' token. */
5900 /* Parse the class-name. The standard, as written, seems to
5901 say that:
5903 template <typename T> struct S { ~S (); };
5904 template <typename T> S<T>::~S() {}
5906 is invalid, since `~' must be followed by a class-name, but
5907 `S<T>' is dependent, and so not known to be a class.
5908 That's not right; we need to look in uninstantiated
5909 templates. A further complication arises from:
5911 template <typename T> void f(T t) {
5912 t.T::~T();
5913 }
5915 Here, it is not possible to look up `T' in the scope of `T'
5916 itself. We must look in both the current scope, and the
5917 scope of the containing complete expression.
5919 Yet another issue is:
5921 struct S {
5922 int S;
5923 ~S();
5924 };
5926 S::~S() {}
5928 The standard does not seem to say that the `S' in `~S'
5929 should refer to the type `S' and not the data member
5930 `S::S'. */
5932 /* DR 244 says that we look up the name after the "~" in the
5933 same scope as we looked up the qualifying name. That idea
5934 isn't fully worked out; it's more complicated than that. */
5939 /* Check for invalid scopes. */
5941 {
5945 }
5947 {
5951 scope);
5956 }
5959 /* If the name is of the form "X::~X" it's OK even if X is a
5960 typedef. */
5969 {
5972 }
5974 /* ~auto means the destructor of whatever the object is. */
5976 {
5979 "%<~auto%> only available with "
5983 }
5985 /* If there was an explicit qualification (S::~T), first look
5986 in the scope given by the qualification (i.e., S).
5988 Note: in the calls to cp_parser_class_name below we pass
5989 typename_type so that lookup finds the injected-class-name
5990 rather than the constructor. */
5994 {
5999 typename_type,
6002 declarator_p);
6005 }
6006 /* In "N::S::~S", look in "N" as well. */
6008 {
6013 type_decl
6017 typename_type,
6020 declarator_p);
6023 }
6024 /* In "p->S::~T", look in the scope given by "*p" as well. */
6026 {
6031 type_decl
6035 typename_type,
6038 declarator_p);
6041 }
6042 /* Look in the surrounding context. */
6044 {
6050 type_decl
6054 typename_type,
6057 declarator_p);
6060 {
6061 /* We couldn't find a type with this name. If we're parsing
6062 tentatively, fail and try something else. */
6064 {
6067 }
6068 /* Otherwise, accept it and check for a match at instantiation
6069 time. */
6074 }
6075 }
6076 /* If an error occurred, assume that the name of the
6077 destructor is the same as the name of the qualifying
6078 class. That allows us to keep parsing after running
6079 into ill-formed destructor names. */
6085 /* Check that destructor name and scope match. */
6087 {
6094 }
6096 /* [class.dtor]
6098 A typedef-name that names a class shall not be used as the
6099 identifier in the declarator for a destructor declaration. */
6106 type_decl);
6109 }
6113 {
6114 cp_expr id;
6116 /* This could be a template-id, so we try that first. */
6118 /* Try a template-id. */
6121 none_type,
6122 declarator_p);
6123 /* If that worked, we're done. */
6126 /* We still don't know whether we're looking at an
6127 operator-function-id or a conversion-function-id. */
6129 /* Try an operator-function-id. */
6131 /* If that didn't work, try a conversion-function-id. */
6136 }
6137 /* Fall through. */
6144 }
6145 }
6147 /* Parse an (optional) nested-name-specifier.
6149 nested-name-specifier: [C++98]
6150 class-or-namespace-name :: nested-name-specifier [opt]
6151 class-or-namespace-name :: template nested-name-specifier [opt]
6153 nested-name-specifier: [C++0x]
6154 type-name ::
6155 namespace-name ::
6156 nested-name-specifier identifier ::
6157 nested-name-specifier template [opt] simple-template-id ::
6159 PARSER->SCOPE should be set appropriately before this function is
6160 called. TYPENAME_KEYWORD_P is TRUE if the `typename' keyword is in
6161 effect. TYPE_P is TRUE if we non-type bindings should be ignored
6162 in name lookups.
6164 Sets PARSER->SCOPE to the class (TYPE) or namespace
6165 (NAMESPACE_DECL) specified by the nested-name-specifier, or leaves
6166 it unchanged if there is no nested-name-specifier. Returns the new
6167 scope iff there is a nested-name-specifier, or NULL_TREE otherwise.
6169 If IS_DECLARATION is TRUE, the nested-name-specifier is known to be
6170 part of a declaration and/or decl-specifier. */
6172 static tree
6179 {
6184 /* Remember where the nested-name-specifier starts. */
6186 {
6189 }
6192 {
6193 tree new_scope;
6194 tree old_scope;
6195 tree saved_qualifying_scope;
6197 /* Spot cases that cannot be the beginning of a
6198 nested-name-specifier. */
6201 /* If the next token is CPP_NESTED_NAME_SPECIFIER, just process
6202 the already parsed nested-name-specifier. */
6204 {
6205 /* Grab the nested-name-specifier and continue the loop. */
6207 /* If we originally encountered this nested-name-specifier
6208 with IS_DECLARATION set to false, we will not have
6209 resolved TYPENAME_TYPEs, so we must do so here. */
6212 {
6217 }
6220 }
6222 /* Spot cases that cannot be the beginning of a
6223 nested-name-specifier. On the second and subsequent times
6224 through the loop, we look for the `template' keyword. */
6226 ;
6227 /* A template-id can start a nested-name-specifier. */
6229 ;
6230 /* DR 743: decltype can be used in a nested-name-specifier. */
6232 ;
6233 else
6234 {
6235 /* If the next token is not an identifier, then it is
6236 definitely not a type-name or namespace-name. */
6239 /* If the following token is neither a `<' (to begin a
6240 template-id), nor a `::', then we are not looking at a
6241 nested-name-specifier. */
6247 {
6251 "found %<:%> in nested-name-specifier, "
6254 }
6257 && !cp_parser_nth_token_starts_template_argument_list_p
6260 }
6262 /* The nested-name-specifier is optional, so we parse
6263 tentatively. */
6266 /* Look for the optional `template' keyword, if this isn't the
6267 first time through the loop. */
6271 /* Save the old scope since the name lookup we are about to do
6272 might destroy it. */
6275 /* In a declarator-id like "X<T>::I::Y<T>" we must be able to
6276 look up names in "X<T>::I" in order to determine that "Y" is
6277 a template. So, if we have a typename at this point, we make
6278 an effort to look through it. */
6280 && !typename_keyword_p
6285 /* Parse the qualifying entity. */
6286 new_scope
6288 typename_keyword_p,
6289 template_keyword_p,
6290 check_dependency_p,
6291 type_p,
6292 is_declaration);
6293 /* Look for the `::' token. */
6296 /* If we found what we wanted, we keep going; otherwise, we're
6297 done. */
6299 {
6302 /* Restore the OLD_SCOPE since it was valid before the
6303 failed attempt at finding the last
6304 class-or-namespace-name. */
6308 /* If the next token is a decltype, and the one after that is a
6309 `::', then the decltype has failed to resolve to a class or
6310 enumeration type. Give this error even when parsing
6311 tentatively since it can't possibly be valid--and we're going
6312 to replace it with a CPP_NESTED_NAME_SPECIFIER below, so we
6313 won't get another chance.*/
6317 {
6324 /* As below. */
6327 }
6331 {
6332 /* If we have a non-type template-id followed by ::, it can't
6333 possibly be valid. */
6338 {
6341 {
6347 }
6348 else
6349 {
6350 /* Variable template. */
6355 }
6362 /* As below. */
6366 }
6367 }
6371 /* If the next token is an identifier, and the one after
6372 that is a `::', then any valid interpretation would have
6373 found a class-or-namespace-name. */
6379 {
6382 {
6384 {
6385 tree decl;
6386 tree ambiguous_decls;
6389 none_type,
6398 decl);
6400 {
6401 // cp_parser_lookup_name has the same diagnostic,
6402 // thus make sure to emit it at most once.
6405 {
6410 }
6412 }
6413 else
6414 {
6416 cp_parser_name_lookup_error
6419 else
6420 cp_parser_name_lookup_error
6423 }
6424 }
6427 /* Treat this as a successful nested-name-specifier
6428 due to:
6430 [basic.lookup.qual]
6432 If the name found is not a class-name (clause
6433 _class_) or namespace-name (_namespace.def_), the
6434 program is ill-formed. */
6436 }
6438 }
6440 }
6441 /* We've found one valid nested-name-specifier. */
6443 /* Name lookup always gives us a DECL. */
6446 /* Uses of "template" must be followed by actual templates. */
6458 new_scope);
6459 /* If it is a class scope, try to complete it; we are about to
6460 be looking up names inside the class. */
6462 /* Since checking types for dependency can be expensive,
6463 avoid doing it if the type is already complete. */
6465 /* Do not try to complete dependent types. */
6467 {
6469 /* If it is a typedef to current class, use the current
6470 class instead, as the typedef won't have any names inside
6471 it yet. */
6475 }
6476 /* Make sure we look in the right scope the next time through
6477 the loop. */
6479 }
6481 /* If parsing tentatively, replace the sequence of tokens that makes
6482 up the nested-name-specifier with a CPP_NESTED_NAME_SPECIFIER
6483 token. That way, should we re-parse the token stream, we will
6484 not have to repeat the effort required to do the parse, nor will
6485 we issue duplicate error messages. */
6487 {
6491 /* Reset the contents of the START token. */
6493 /* Retrieve any deferred checks. Do not pop this access checks yet
6494 so the memory will not be reclaimed during token replacing below. */
6502 /* Purge all subsequent tokens. */
6504 }
6510 }
6512 /* Parse a nested-name-specifier. See
6513 cp_parser_nested_name_specifier_opt for details. This function
6514 behaves identically, except that it will an issue an error if no
6515 nested-name-specifier is present. */
6517 static tree
6523 {
6524 tree scope;
6526 /* Look for the nested-name-specifier. */
6528 typename_keyword_p,
6529 check_dependency_p,
6530 type_p,
6531 is_declaration);
6532 /* If it was not present, issue an error message. */
6534 {
6537 }
6540 }
6542 /* Parse the qualifying entity in a nested-name-specifier. For C++98,
6543 this is either a class-name or a namespace-name (which corresponds
6544 to the class-or-namespace-name production in the grammar). For
6545 C++0x, it can also be a type-name that refers to an enumeration
6546 type or a simple-template-id.
6548 TYPENAME_KEYWORD_P is TRUE iff the `typename' keyword is in effect.
6549 TEMPLATE_KEYWORD_P is TRUE iff the `template' keyword is in effect.
6550 CHECK_DEPENDENCY_P is FALSE iff dependent names should be looked up.
6551 TYPE_P is TRUE iff the next name should be taken as a class-name,
6552 even the same name is declared to be another entity in the same
6553 scope.
6555 Returns the class (TYPE_DECL) or namespace (NAMESPACE_DECL)
6556 specified by the class-or-namespace-name. If neither is found the
6557 ERROR_MARK_NODE is returned. */
6559 static tree
6566 {
6567 tree saved_scope;
6568 tree saved_qualifying_scope;
6569 tree saved_object_scope;
6570 tree scope;
6574 /* DR 743: decltype can appear in a nested-name-specifier. */
6576 {
6580 {
6583 }
6587 }
6589 /* Before we try to parse the class-name, we must save away the
6590 current PARSER->SCOPE since cp_parser_class_name will destroy
6591 it. */
6595 /* Try for a class-name first. If the SAVED_SCOPE is a type, then
6596 there is no need to look for a namespace-name. */
6597 only_class_p = template_keyword_p
6602 typename_keyword_p,
6603 template_keyword_p,
6605 check_dependency_p,
6607 is_declaration,
6610 /* If that didn't work, try for a namespace-name. */
6612 {
6613 /* Restore the saved scope. */
6617 /* If we are not looking at an identifier followed by the scope
6618 resolution operator, then this is not part of a
6619 nested-name-specifier. (Note that this function is only used
6620 to parse the components of a nested-name-specifier.) */
6625 }
6628 }
6630 /* Return true if we are looking at a compound-literal, false otherwise. */
6632 static bool
6634 {
6637 /* Skip tokens until the next token is a closing parenthesis.
6638 If we find the closing `)', and the next token is a `{', then
6639 we are looking at a compound-literal. */
6640 bool compound_literal_p
6645 /* Roll back the tokens we skipped. */
6649 }
6651 /* Return true if EXPR is the integer constant zero or a complex constant
6652 of zero, without any folding, but ignoring location wrappers. */
6654 bool
6656 {
6659 }
6661 /* Parse a postfix-expression.
6663 postfix-expression:
6664 primary-expression
6665 postfix-expression [ expression ]
6666 postfix-expression ( expression-list [opt] )
6667 simple-type-specifier ( expression-list [opt] )
6668 typename :: [opt] nested-name-specifier identifier
6669 ( expression-list [opt] )
6670 typename :: [opt] nested-name-specifier template [opt] template-id
6671 ( expression-list [opt] )
6672 postfix-expression . template [opt] id-expression
6673 postfix-expression -> template [opt] id-expression
6674 postfix-expression . pseudo-destructor-name
6675 postfix-expression -> pseudo-destructor-name
6676 postfix-expression ++
6677 postfix-expression --
6678 dynamic_cast < type-id > ( expression )
6679 static_cast < type-id > ( expression )
6680 reinterpret_cast < type-id > ( expression )
6681 const_cast < type-id > ( expression )
6682 typeid ( expression )
6683 typeid ( type-id )
6685 GNU Extension:
6687 postfix-expression:
6688 ( type-id ) { initializer-list , [opt] }
6690 This extension is a GNU version of the C99 compound-literal
6691 construct. (The C99 grammar uses `type-name' instead of `type-id',
6692 but they are essentially the same concept.)
6694 If ADDRESS_P is true, the postfix expression is the operand of the
6695 `&' operator. CAST_P is true if this expression is the target of a
6696 cast.
6698 If MEMBER_ACCESS_ONLY_P, we only allow postfix expressions that are
6699 class member access expressions [expr.ref].
6701 Returns a representation of the expression. */
6703 static cp_expr
6707 {
6709 location_t loc;
6715 /* Peek at the next token. */
6720 /* Some of the productions are determined by keywords. */
6723 {
6728 {
6729 tree type;
6730 cp_expr expression;
6734 /* All of these can be handled in the same way from the point
6735 of view of parsing. Begin by consuming the token
6736 identifying the cast. */
6739 /* New types cannot be defined in the cast. */
6741 parser->type_definition_forbidden_message
6744 /* Look for the opening `<'. */
6746 /* Parse the type to which we are casting. */
6751 /* Look for the closing `>'. */
6753 /* Restore the old message. */
6756 bool saved_greater_than_is_operator_p
6760 /* And the expression which is being cast. */
6761 matching_parens parens;
6765 RT_CLOSE_PAREN);
6769 parser->greater_than_is_operator_p
6772 /* Only type conversions to integral or enumeration types
6773 can be used in constant-expressions. */
6776 {
6779 }
6782 {
6784 postfix_expression
6788 postfix_expression
6792 postfix_expression
6794 tf_warning_or_error);
6797 postfix_expression
6802 }
6804 /* Construct a location e.g. :
6805 reinterpret_cast <int *> (expr)
6806 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6807 ranging from the start of the "*_cast" token to the final closing
6808 paren, with the caret at the start. */
6811 }
6815 {
6816 tree type;
6820 /* Consume the `typeid' token. */
6822 /* Look for the `(' token. */
6823 matching_parens parens;
6825 /* Types cannot be defined in a `typeid' expression. */
6827 parser->type_definition_forbidden_message
6829 /* We can't be sure yet whether we're looking at a type-id or an
6830 expression. */
6832 /* Try a type-id first. */
6837 /* Look for the `)' token. Otherwise, we can't be sure that
6838 we're not looking at an expression: consider `typeid (int
6839 (3))', for example. */
6841 /* If all went well, simply lookup the type-id. */
6844 /* Otherwise, fall back to the expression variant. */
6845 else
6846 {
6847 tree expression;
6849 /* Look for an expression. */
6851 /* Compute its typeid. */
6853 /* Look for the `)' token. */
6855 }
6856 /* Restore the saved message. */
6858 /* `typeid' may not appear in an integral constant expression. */
6862 /* Construct a location e.g. :
6863 typeid (expr)
6864 ^~~~~~~~~~~~~
6865 ranging from the start of the "typeid" token to the final closing
6866 paren, with the caret at the start. */
6868 {
6869 location_t typeid_loc
6873 }
6874 }
6878 {
6879 tree type;
6880 /* The syntax permitted here is the same permitted for an
6881 elaborated-type-specifier. */
6888 }
6894 {
6897 tree p;
6904 {
6907 }
6913 {
6916 postfix_expression
6918 else
6919 {
6923 }
6929 tf_warning_or_error);
6930 else
6931 {
6935 }
6940 postfix_expression
6944 postfix_expression
6947 else
6948 {
6952 }
6957 }
6959 }
6962 {
6963 tree type;
6965 /* If the next thing is a simple-type-specifier, we may be
6966 looking at a functional cast. We could also be looking at
6967 an id-expression. So, we try the functional cast, and if
6968 that doesn't work we fall back to the primary-expression. */
6970 /* Look for the simple-type-specifier. */
6974 CP_PARSER_FLAGS_NONE);
6976 /* Parse the cast itself. */
6978 postfix_expression
6980 /* If that worked, we're done. */
6984 /* If the functional-cast didn't work out, try a
6985 compound-literal. */
6988 {
6993 matching_parens parens;
6996 /* Avoid calling cp_parser_type_id pointlessly, see comment
6997 in cp_parser_cast_expression about c++/29234. */
7000 else
7001 {
7002 /* Parse the type. */
7008 }
7010 /* If things aren't going well, there's no need to
7011 keep going. */
7013 {
7015 /* Parse the brace-enclosed initializer list. */
7018 }
7019 /* If that worked, we're definitely looking at a
7020 compound-literal expression. */
7022 {
7023 /* Warn the user that a compound literal is not
7024 allowed in standard C++. */
7027 /* For simplicity, we disallow compound literals in
7028 constant-expressions. We could
7029 allow compound literals of integer type, whose
7030 initializer was a constant, in constant
7031 expressions. Permitting that usage, as a further
7032 extension, would not change the meaning of any
7033 currently accepted programs. (Of course, as
7034 compound literals are not part of ISO C++, the
7035 standard has nothing to say.) */
7037 NIC_NCC))
7038 {
7041 }
7042 /* Form the representation of the compound-literal. */
7043 postfix_expression
7048 }
7049 }
7051 /* It must be a primary-expression. */
7052 postfix_expression
7055 decltype_p,
7057 }
7059 }
7061 /* Note that we don't need to worry about calling build_cplus_new on a
7062 class-valued CALL_EXPR in decltype when it isn't the end of the
7063 postfix-expression; unary_complex_lvalue will take care of that for
7064 all these cases. */
7066 /* Keep looping until the postfix-expression is complete. */
7068 {
7072 /* It is not a Koenig lookup function call. */
7073 postfix_expression
7076 /* Peek at the next token. */
7080 {
7083 {
7085 "two consecutive %<[%> shall "
7088 }
7089 postfix_expression
7091 postfix_expression,
7093 decltype_p);
7102 /* postfix-expression ( expression-list [opt] ) */
7103 {
7114 is_builtin_constant_p
7117 {
7118 /* The whole point of __builtin_constant_p is to allow
7119 non-constant expressions to appear as arguments. */
7120 saved_integral_constant_expression_p
7122 saved_non_integral_constant_expression_p
7125 }
7126 args = (cp_parser_parenthesized_expression_list
7133 {
7134 parser->integral_constant_expression_p
7136 parser->non_integral_constant_expression_p
7138 }
7141 {
7144 }
7146 /* Function calls are not permitted in
7147 constant-expressions. */
7150 NIC_FUNC_CALL))
7151 {
7155 }
7160 {
7162 {
7164 {
7167 postfix_expression
7169 complain);
7170 }
7171 else
7172 postfix_expression
7174 }
7175 /* We do not perform argument-dependent lookup if
7176 normal lookup finds a non-function, in accordance
7177 with the expected resolution of DR 218. */
7180 {
7184 /* Do not do argument dependent lookup if regular
7185 lookup finds a member function or a block-scope
7186 function declaration. [basic.lookup.argdep]/3 */
7189 {
7192 postfix_expression
7194 complain);
7195 }
7196 }
7197 }
7200 {
7210 {
7212 postfix_expression
7216 }
7219 {
7220 postfix_expression
7221 = (build_new_method_call
7227 complain));
7228 }
7229 else
7230 postfix_expression
7234 complain);
7235 }
7239 postfix_expression = (build_offset_ref_call_from_tree
7241 complain));
7243 /* A call to a static class member, or a namespace-scope
7244 function. */
7245 postfix_expression
7248 koenig_p,
7249 complain);
7250 else
7251 /* All other function calls. */
7252 postfix_expression
7255 koenig_p,
7256 complain);
7259 {
7261 start_loc,
7262 close_paren_loc);
7264 }
7266 /* The POSTFIX_EXPRESSION is certainly no longer an id. */
7270 }
7275 /* postfix-expression . template [opt] id-expression
7276 postfix-expression . pseudo-destructor-name
7277 postfix-expression -> template [opt] id-expression
7278 postfix-expression -> pseudo-destructor-name */
7280 /* Consume the `.' or `->' operator. */
7283 postfix_expression
7285 postfix_expression,
7292 /* postfix-expression ++ */
7293 /* Consume the `++' token. */
7295 /* Generate a representation for the complete expression. */
7296 postfix_expression
7298 POSTINCREMENT_EXPR);
7299 /* Increments may not appear in constant-expressions. */
7307 /* postfix-expression -- */
7308 /* Consume the `--' token. */
7310 /* Generate a representation for the complete expression. */
7311 postfix_expression
7313 POSTDECREMENT_EXPR);
7314 /* Decrements may not appear in constant-expressions. */
7325 return is_member_access
7326 ? postfix_expression
7328 else
7330 }
7331 }
7333 /* We should never get here. */
7336 }
7338 /* A subroutine of cp_parser_postfix_expression that also gets hijacked
7339 by cp_parser_builtin_offsetof. We're looking for
7341 postfix-expression [ expression ]
7342 postfix-expression [ braced-init-list ] (C++11)
7344 FOR_OFFSETOF is set if we're being called in that context, which
7345 changes how we deal with integer constant expressions. */
7347 static tree
7349 tree postfix_expression,
7352 {
7357 /* Consume the `[' token. */
7363 /* Parse the index expression. */
7364 /* ??? For offsetof, there is a question of what to allow here. If
7365 offsetof is not being used in an integral constant expression context,
7366 then we *could* get the right answer by computing the value at runtime.
7367 If we are in an integral constant expression context, then we might
7368 could accept any constant expression; hard to say without analysis.
7369 Rather than open the barn door too wide right away, allow only integer
7370 constant expressions here. */
7373 else
7374 {
7376 {
7381 }
7382 else
7384 }
7388 /* Look for the closing `]'. */
7391 /* Build the ARRAY_REF. */
7395 /* When not doing offsetof, array references are not permitted in
7396 constant-expressions. */
7402 }
7404 /* A subroutine of cp_parser_postfix_dot_deref_expression. Handle dot
7405 dereference of incomplete type, returns true if error_mark_node should
7406 be returned from caller, otherwise adjusts *SCOPE, *POSTFIX_EXPRESSION
7407 and *DEPENDENT_P. */
7409 bool
7412 {
7413 /* In a template, be permissive by treating an object expression
7414 of incomplete type as dependent (after a pedwarn). */
7415 diagnostic_t kind = (processing_template_decl
7419 {
7431 /* Don't emit any diagnostic for OVERLOADs. */
7435 /* Avoid clobbering e.g. DECLs. */
7439 }
7451 {
7454 }
7456 }
7458 /* A subroutine of cp_parser_postfix_expression that also gets hijacked
7459 by cp_parser_builtin_offsetof. We're looking for
7461 postfix-expression . template [opt] id-expression
7462 postfix-expression . pseudo-destructor-name
7463 postfix-expression -> template [opt] id-expression
7464 postfix-expression -> pseudo-destructor-name
7466 FOR_OFFSETOF is set if we're being called in that context. That sorta
7467 limits what of the above we'll actually accept, but nevermind.
7468 TOKEN_TYPE is the "." or "->" token, which will already have been
7469 removed from the stream. */
7471 static tree
7474 cp_expr postfix_expression,
7476 location_t location)
7477 {
7478 tree name;
7484 /* If this is a `->' operator, dereference the pointer. */
7487 tf_warning_or_error);
7488 /* Check to see whether or not the expression is type-dependent and
7489 not the current instantiation. */
7491 /* The identifier following the `->' or `.' is not qualified. */
7497 /* Enter the scope corresponding to the type of the object
7498 given by the POSTFIX_EXPRESSION. */
7500 {
7502 /* According to the standard, no expression should ever have
7503 reference type. Unfortunately, we do not currently match
7504 the standard in this respect in that our internal representation
7505 of an expression may have reference type even when the standard
7506 says it does not. Therefore, we have to manually obtain the
7507 underlying type here. */
7509 /* The type of the POSTFIX_EXPRESSION must be complete. */
7510 /* Unlike the object expression in other contexts, *this is not
7511 required to be of complete type for purposes of class member
7512 access (5.2.5) outside the member function body. */
7516 {
7522 }
7525 {
7526 /* Let the name lookup machinery know that we are processing a
7527 class member access expression. */
7529 /* If something went wrong, we want to be able to discern that case,
7530 as opposed to the case where there was no SCOPE due to the type
7531 of expression being dependent. */
7534 /* If the SCOPE was erroneous, make the various semantic analysis
7535 functions exit quickly -- and without issuing additional error
7536 messages. */
7539 }
7540 }
7543 /* Tell cp_parser_lookup_name that there was an object, even though it's
7544 type-dependent. */
7547 /* Assume this expression is not a pseudo-destructor access. */
7550 /* If the SCOPE is a scalar type, then, if this is a valid program,
7551 we must be looking at a pseudo-destructor-name. If POSTFIX_EXPRESSION
7552 is type dependent, it can be pseudo-destructor-name or something else.
7553 Try to parse it as pseudo-destructor-name first. */
7555 {
7556 tree s;
7557 tree type;
7560 /* Parse the pseudo-destructor-name. */
7569 {
7571 postfix_expression
7574 }
7575 }
7578 {
7579 /* If the SCOPE is not a scalar type, we are looking at an
7580 ordinary class member access expression, rather than a
7581 pseudo-destructor-name. */
7584 /* Parse the id-expression. */
7585 name = (cp_parser_id_expression
7592 /* In general, build a SCOPE_REF if the member name is qualified.
7593 However, if the name was not dependent and has already been
7594 resolved; there is no need to build the SCOPE_REF. For example;
7596 struct X { void f(); };
7597 template <typename T> void f(T* t) { t->X::f(); }
7599 Even though "t" is dependent, "X::f" is not and has been resolved
7600 to a BASELINK; there is no need to include scope information. */
7602 /* But we do need to remember that there was an explicit scope for
7603 virtual function calls. */
7607 /* If the name is a template-id that names a type, we will get a
7608 TYPE_DECL here. That is invalid code. */
7610 {
7613 }
7614 else
7615 {
7617 {
7619 {
7623 }
7624 else
7627 name,
7628 template_p);
7632 }
7634 adjust_result_of_qualified_name_lookup
7636 postfix_expression
7638 template_p,
7639 tf_warning_or_error);
7640 /* Build a location e.g.:
7641 ptr->access_expr
7642 ~~~^~~~~~~~~~~~~
7643 where the caret is at the deref token, ranging from
7644 the start of postfix_expression to the end of the access expr. */
7645 location_t end_loc
7647 location_t combined_loc
7650 }
7651 }
7653 /* We no longer need to look up names in the scope of the object on
7654 the left-hand side of the `.' or `->' operator. */
7657 /* Outside of offsetof, these operators may not appear in
7658 constant-expressions. */
7660 && (cp_parser_non_integral_constant_expression
7665 }
7667 /* Parse a parenthesized expression-list.
7669 expression-list:
7670 assignment-expression
7671 expression-list, assignment-expression
7673 attribute-list:
7674 expression-list
7675 identifier
7676 identifier, expression-list
7678 CAST_P is true if this expression is the target of a cast.
7680 ALLOW_EXPANSION_P is true if this expression allows expansion of an
7681 argument pack.
7683 WRAP_LOCATIONS_P is true if expressions within this list for which
7684 CAN_HAVE_LOCATION_P is false should be wrapped with nodes expressing
7685 their source locations.
7687 Returns a vector of trees. Each element is a representation of an
7688 assignment-expression. NULL is returned if the ( and or ) are
7689 missing. An empty, but allocated, vector is returned on no
7690 expressions. The parentheses are eaten. IS_ATTRIBUTE_LIST is id_attr
7691 if we are parsing an attribute list for an attribute that wants a
7692 plain identifier argument, normal_attr for an attribute that wants
7693 an expression, or non_attr if we aren't parsing an attribute list. If
7694 NON_CONSTANT_P is non-NULL, *NON_CONSTANT_P indicates whether or
7695 not all of the expressions in the list were constant.
7696 If CLOSE_PAREN_LOC is non-NULL, and no errors occur, then *CLOSE_PAREN_LOC
7697 will be written to with the location of the closing parenthesis. If
7698 an error occurs, it may or may not be written to. */
7708 {
7714 /* Assume all the expressions will be constant. */
7718 matching_parens parens;
7724 /* Within a parenthesized expression, a `>' token is always
7725 the greater-than operator. */
7726 saved_greater_than_is_operator_p
7732 /* Consume expressions until there are no more. */
7735 {
7736 /* At the beginning of attribute lists, check to see if the
7737 next token is an identifier. */
7740 {
7743 /* Consume the identifier. */
7745 /* Save the identifier. */
7747 }
7748 else
7749 {
7752 /* Parse the next assignment-expression. */
7754 {
7755 /* A braced-init-list. */
7761 }
7763 {
7764 expr = (cp_parser_constant_expression
7769 }
7770 else
7772 cast_p);
7777 /* If we have an ellipsis, then this is an expression
7778 expansion. */
7781 {
7782 /* Consume the `...'. */
7785 /* Build the argument pack. */
7787 }
7792 /* Add it to the list. We add error_mark_node
7793 expressions to the list, so that we can still tell if
7794 the correct form for a parenthesized expression-list
7795 is found. That gives better errors. */
7800 }
7802 /* After the first item, attribute lists look the same as
7803 expression lists. */
7806 get_comma:;
7807 /* If the next token isn't a `,', then we are done. */
7811 /* Otherwise, consume the `,' and keep going. */
7813 }
7819 {
7822 skip_comma:;
7823 /* We try and resync to an unnested comma, as that will give the
7824 user better diagnostics. */
7832 {
7833 parser->greater_than_is_operator_p
7836 }
7837 }
7839 parser->greater_than_is_operator_p
7846 }
7848 /* Parse a pseudo-destructor-name.
7850 pseudo-destructor-name:
7851 :: [opt] nested-name-specifier [opt] type-name :: ~ type-name
7852 :: [opt] nested-name-specifier template template-id :: ~ type-name
7853 :: [opt] nested-name-specifier [opt] ~ type-name
7855 If either of the first two productions is used, sets *SCOPE to the
7856 TYPE specified before the final `::'. Otherwise, *SCOPE is set to
7857 NULL_TREE. *TYPE is set to the TYPE_DECL for the final type-name,
7858 or ERROR_MARK_NODE if the parse fails. */
7860 static void
7862 tree object,
7865 {
7868 /* Handle ~auto. */
7872 {
7875 "%<~auto%> only available with "
7882 }
7884 /* Assume that things will not work out. */
7887 /* Look for the optional `::' operator. */
7889 /* Look for the optional nested-name-specifier. */
7890 nested_name_specifier_p
7897 /* Now, if we saw a nested-name-specifier, we might be doing the
7898 second production. */
7901 {
7902 /* Consume the `template' keyword. */
7904 /* Parse the template-id. */
7908 class_type,
7910 /* Look for the `::' token. */
7912 }
7913 /* If the next token is not a `~', then there might be some
7914 additional qualification. */
7916 {
7917 /* At this point, we're looking for "type-name :: ~". The type-name
7918 must not be a class-name, since this is a pseudo-destructor. So,
7919 it must be either an enum-name, or a typedef-name -- both of which
7920 are just identifiers. So, we peek ahead to check that the "::"
7921 and "~" tokens are present; if they are not, then we can avoid
7922 calling type_name. */
7926 {
7929 }
7931 /* Look for the type-name. */
7936 /* Look for the `::' token. */
7938 }
7939 else
7942 /* Look for the `~'. */
7945 /* Once we see the ~, this has to be a pseudo-destructor. */
7949 /* Look for the type-name again. We are not responsible for
7950 checking that it matches the first type-name. */
7952 }
7954 /* Parse a unary-expression.
7956 unary-expression:
7957 postfix-expression
7958 ++ cast-expression
7959 -- cast-expression
7960 unary-operator cast-expression
7961 sizeof unary-expression
7962 sizeof ( type-id )
7963 alignof ( type-id ) [C++0x]
7964 new-expression
7965 delete-expression
7967 GNU Extensions:
7969 unary-expression:
7970 __extension__ cast-expression
7971 __alignof__ unary-expression
7972 __alignof__ ( type-id )
7973 alignof unary-expression [C++0x]
7974 __real__ cast-expression
7975 __imag__ cast-expression
7976 && identifier
7977 sizeof ( type-id ) { initializer-list , [opt] }
7978 alignof ( type-id ) { initializer-list , [opt] } [C++0x]
7979 __alignof__ ( type-id ) { initializer-list , [opt] }
7981 ADDRESS_P is true iff the unary-expression is appearing as the
7982 operand of the `&' operator. CAST_P is true if this expression is
7983 the target of a cast.
7985 Returns a representation of the expression. */
7987 static cp_expr
7990 {
7994 /* Peek at the next token. */
7996 /* Some keywords give away the kind of expression. */
7998 {
8002 {
8005 {
8013 /* Consume the token. */
8015 /* Parse the operand. */
8021 else
8022 {
8023 /* ISO C++ defines alignof only with types, not with
8024 expressions. So pedwarn if alignof is used with a non-
8025 type expression. However, __alignof__ is ok. */
8028 "ISO C++ does not allow %<alignof%> "
8032 }
8033 /* For SIZEOF_EXPR, just issue diagnostics, but keep
8034 SIZEOF_EXPR with the original operand. */
8036 {
8038 {
8040 {
8043 error_mark_node));
8045 }
8046 else
8050 }
8051 }
8053 /* Construct a location e.g. :
8054 alignof (expr)
8055 ^~~~~~~~~~~~~~
8056 with start == caret at the start of the "alignof"/"sizeof"
8057 token, with the endpoint at the final closing paren. */
8058 location_t finish_loc
8060 location_t compound_loc
8067 }
8076 {
8077 /* The saved value of the PEDANTIC flag. */
8079 tree expr;
8081 /* Save away the PEDANTIC flag. */
8083 /* Parse the cast-expression. */
8085 /* Restore the PEDANTIC flag. */
8089 }
8093 {
8094 tree expression;
8096 /* Consume the `__real__' or `__imag__' token. */
8098 /* Parse the cast-expression. */
8100 /* Create the complete representation. */
8104 expression,
8105 tf_warning_or_error);
8106 }
8114 {
8115 tree expr;
8124 matching_parens parens;
8128 parser->type_definition_forbidden_message
8131 saved_integral_constant_expression_p
8133 saved_non_integral_constant_expression_p
8137 saved_greater_than_is_operator_p
8149 parser->greater_than_is_operator_p
8152 parser->integral_constant_expression_p
8154 parser->non_integral_constant_expression_p
8159 location_t finish_loc
8163 /* Construct a location of the form:
8164 noexcept (expr)
8165 ^~~~~~~~~~~~~~~
8166 with start == caret, finishing at the close-paren. */
8167 location_t noexcept_loc
8171 noexcept_loc);
8172 }
8176 }
8177 }
8179 /* Look for the `:: new' and `:: delete', which also signal the
8180 beginning of a new-expression, or delete-expression,
8181 respectively. If the next token is `::', then it might be one of
8182 these. */
8184 {
8187 /* See if the token after the `::' is one of the keywords in
8188 which we're interested. */
8190 /* If it's `new', we have a new-expression. */
8193 /* Similarly, for `delete'. */
8196 }
8198 /* Look for a unary operator. */
8200 /* The `++' and `--' operators can be handled similarly, even though
8201 they are not technically unary-operators in the grammar. */
8203 {
8208 /* Handle the GNU address-of-label extension. */
8211 {
8212 tree identifier;
8213 tree expression;
8216 /* Consume the '&&' token. */
8218 /* Look for the identifier. */
8219 location_t finish_loc
8222 /* Construct a location of the form:
8223 &&label
8224 ^~~~~~~
8225 with caret==start at the "&&", finish at the end of the label. */
8226 location_t combined_loc
8228 /* Create an expression representing the address. */
8231 NIC_ADDR_LABEL))
8234 }
8235 }
8237 {
8238 cp_expr cast_expression;
8244 /* Consume the operator token. */
8248 /* Parse the cast-expression. */
8249 cast_expression
8254 pidk);
8256 /* Make a location:
8257 OP_TOKEN CAST_EXPRESSION
8258 ^~~~~~~~~~~~~~~~~~~~~~~~~
8259 with start==caret at the operator token, and
8260 extending to the end of the cast_expression. */
8263 /* Now, build an appropriate representation. */
8265 {
8269 RO_UNARY_STAR,
8270 complain);
8271 /* TODO: build_x_indirect_ref does not always honor the
8272 location, so ensure it is set. */
8278 /* Fall through. */
8281 cast_expression,
8282 complain);
8283 /* TODO: build_x_unary_op does not always honor the location,
8284 so ensure it is set. */
8292 /* Fall through. */
8294 /* Immediately fold negation of a constant, unless the constant is 0
8295 (since -0 == 0) or it would overflow. */
8300 {
8303 cast_expression);
8305 {
8308 }
8309 }
8310 /* Fall through. */
8319 }
8323 non_constant_p))
8327 }
8331 decltype_p,
8332 pidk);
8333 }
8335 /* Returns ERROR_MARK if TOKEN is not a unary-operator. If TOKEN is a
8336 unary-operator, the corresponding tree code is returned. */
8338 static enum tree_code
8340 {
8342 {
8363 }
8364 }
8366 /* Parse a new-expression.
8368 new-expression:
8369 :: [opt] new new-placement [opt] new-type-id new-initializer [opt]
8370 :: [opt] new new-placement [opt] ( type-id ) new-initializer [opt]
8372 Returns a representation of the expression. */
8374 static tree
8376 {
8379 tree type;
8382 tree ret;
8386 /* Look for the optional `::' operator. */
8387 global_scope_p
8391 /* Look for the `new' operator. */
8393 /* There's no easy way to tell a new-placement from the
8394 `( type-id )' construct. */
8396 /* Look for a new-placement. */
8398 /* If that didn't work out, there's no new-placement. */
8400 {
8404 }
8406 /* If the next token is a `(', then we have a parenthesized
8407 type-id. */
8409 {
8413 /* Consume the `('. */
8414 matching_parens parens;
8417 /* Parse the type-id. */
8418 parser->type_definition_forbidden_message
8420 {
8423 }
8426 /* Look for the closing `)'. */
8429 /* There should not be a direct-new-declarator in this production,
8430 but GCC used to allowed this, so we check and emit a sensible error
8431 message for this case. */
8433 {
8439 }
8440 }
8441 /* Otherwise, there must be a new-type-id. */
8442 else
8445 /* If the next token is a `(' or '{', then we have a new-initializer. */
8450 else
8453 /* A new-expression may not appear in an integral constant
8454 expression. */
8457 /* 5.3.4/2: "If the auto type-specifier appears in the type-specifier-seq
8458 of a new-type-id or type-id of a new-expression, the new-expression shall
8459 contain a new-initializer of the form ( assignment-expression )".
8460 Additionally, consistently with the spirit of DR 1467, we want to accept
8461 'new auto { 2 }' too. */
8467 {
8469 "initialization of new-expression for type %<auto%> "
8472 }
8473 else
8474 {
8475 /* Construct a location e.g.:
8476 ptr = new int[100]
8477 ^~~~~~~~~~~~
8478 with caret == start at the start of the "new" token, and the end
8479 at the end of the final token we consumed. */
8484 /* Create a representation of the new-expression. */
8486 tf_warning_or_error);
8488 }
8496 }
8498 /* Parse a new-placement.
8500 new-placement:
8501 ( expression-list )
8503 Returns the same representation as for an expression-list. */
8507 {
8510 /* Parse the expression-list. */
8511 expression_list = (cp_parser_parenthesized_expression_list
8520 }
8522 /* Parse a new-type-id.
8524 new-type-id:
8525 type-specifier-seq new-declarator [opt]
8527 Returns the TYPE allocated. If the new-type-id indicates an array
8528 type, *NELTS is set to the number of elements in the last array
8529 bound; the TYPE will not include the last array bound. */
8531 static tree
8533 {
8534 cp_decl_specifier_seq type_specifier_seq;
8540 /* The type-specifier sequence must not contain type definitions.
8541 (It cannot contain declarations of new types either, but if they
8542 are not definitions we will catch that because they are not
8543 complete.) */
8545 parser->type_definition_forbidden_message
8547 /* Parse the type-specifier-seq. */
8551 /* Restore the old message. */
8557 /* Parse the new-declarator. */
8560 /* Determine the number of elements in the last array dimension, if
8561 any. */
8563 /* Skip down to the last array dimension. */
8568 {
8571 }
8576 {
8579 }
8582 {
8589 else
8591 }
8594 }
8596 /* Parse an (optional) new-declarator.
8598 new-declarator:
8599 ptr-operator new-declarator [opt]
8600 direct-new-declarator
8602 Returns the declarator. */
8606 {
8609 cp_cv_quals cv_quals;
8611 /* We don't know if there's a ptr-operator next, or not. */
8613 /* Look for a ptr-operator. */
8615 /* If that worked, look for more new-declarators. */
8617 {
8620 /* Parse another optional declarator. */
8623 declarator = cp_parser_make_indirect_declarator
8627 }
8629 /* If the next token is a `[', there is a direct-new-declarator. */
8634 }
8636 /* Parse a direct-new-declarator.
8638 direct-new-declarator:
8639 [ expression ]
8640 direct-new-declarator [constant-expression]
8642 */
8646 {
8650 {
8651 tree expression;
8654 /* Look for the opening `['. */
8659 /* The standard requires that the expression have integral
8660 type. DR 74 adds enumeration types. We believe that the
8661 real intent is that these expressions be handled like the
8662 expression in a `switch' condition, which also allows
8663 classes with a single conversion to integral or
8664 enumeration type. */
8666 {
8667 expression
8669 expression,
8672 {
8674 "expression in new-declarator must have integral "
8677 }
8678 }
8680 /* Look for the closing `]'. */
8683 /* Add this bound to the declarator. */
8686 /* If the next token is not a `[', then there are no more
8687 bounds. */
8690 }
8693 }
8695 /* Parse a new-initializer.
8697 new-initializer:
8698 ( expression-list [opt] )
8699 braced-init-list
8701 Returns a representation of the expression-list. */
8705 {
8709 {
8710 tree t;
8717 }
8718 else
8719 expression_list = (cp_parser_parenthesized_expression_list
8725 }
8727 /* Parse a delete-expression.
8729 delete-expression:
8730 :: [opt] delete cast-expression
8731 :: [opt] delete [ ] cast-expression
8733 Returns a representation of the expression. */
8735 static tree
8737 {
8740 tree expression;
8742 /* Look for the optional `::' operator. */
8743 global_scope_p
8747 /* Look for the `delete' keyword. */
8749 /* See if the array syntax is in use. */
8751 {
8752 /* Consume the `[' token. */
8754 /* Look for the `]' token. */
8756 /* Remember that this is the `[]' construct. */
8758 }
8759 else
8762 /* Parse the cast-expression. */
8765 /* A delete-expression may not appear in an integral constant
8766 expression. */
8771 tf_warning_or_error);
8772 }
8774 /* Returns 1 if TOKEN may start a cast-expression and isn't '++', '--',
8775 neither '[' in C++11; -1 if TOKEN is '++', '--', or '[' in C++11;
8776 0 otherwise. */
8778 static int
8780 {
8783 {
8825 /* In ((type ()) () the last () isn't a valid cast-expression,
8826 so the whole must be parsed as postfix-expression. */
8831 /* '[' may start a primary-expression in obj-c++ and in C++11,
8832 as a lambda-expression, eg, '(void)[]{}'. */
8839 /* '++' and '--' may or may not start a cast-expression:
8841 struct T { void operator++(int); };
8842 void f() { (T())++; }
8844 vs
8846 int a;
8847 (int)++a; */
8852 }
8853 }
8855 /* Try to find a legal C++-style cast to DST_TYPE for ORIG_EXPR, trying them
8856 in the order: const_cast, static_cast, reinterpret_cast.
8858 Don't suggest dynamic_cast.
8860 Return the first legal cast kind found, or NULL otherwise. */
8864 {
8865 tree trial;
8867 /* Reuse the parser logic by attempting to build the various kinds of
8868 cast, with "complain" disabled.
8869 Identify the first such cast that is valid. */
8871 /* Don't attempt to run such logic within template processing. */
8875 /* First try const_cast. */
8880 /* If that fails, try static_cast. */
8885 /* Finally, try reinterpret_cast. */
8890 /* No such cast possible. */
8892 }
8894 /* If -Wold-style-cast is enabled, add fix-its to RICHLOC,
8895 suggesting how to convert a C-style cast of the form:
8897 (DST_TYPE)ORIG_EXPR
8899 to a C++-style cast.
8901 The primary range of RICHLOC is asssumed to be that of the original
8902 expression. OPEN_PAREN_LOC and CLOSE_PAREN_LOC give the locations
8903 of the parens in the C-style cast. */
8905 static void
8908 tree dst_type)
8909 {
8910 /* This function is non-trivial, so bail out now if the warning isn't
8911 going to be emitted. */
8915 /* Try to find a legal C++ cast, trying them in order:
8916 const_cast, static_cast, reinterpret_cast. */
8921 /* Replace the open paren with "CAST_SUGGESTION<". */
8922 pretty_printer pp;
8926 /* Replace the close paren with "> (". */
8929 /* Add a closing paren after the expr (the primary range of RICH_LOC). */
8931 }
8934 /* Parse a cast-expression.
8936 cast-expression:
8937 unary-expression
8938 ( type-id ) cast-expression
8940 ADDRESS_P is true iff the unary-expression is appearing as the
8941 operand of the `&' operator. CAST_P is true if this expression is
8942 the target of a cast.
8944 Returns a representation of the expression. */
8946 static cp_expr
8949 {
8950 /* If it's a `(', then we might be looking at a cast. */
8952 {
8958 /* There's no way to know yet whether or not this is a cast.
8959 For example, `(int (3))' is a unary-expression, while `(int)
8960 3' is a cast. So, we resort to parsing tentatively. */
8962 /* Types may not be defined in a cast. */
8964 parser->type_definition_forbidden_message
8966 /* Consume the `('. */
8967 matching_parens parens;
8972 /* A very tricky bit is that `(struct S) { 3 }' is a
8973 compound-literal (which we permit in C++ as an extension).
8974 But, that construct is not a cast-expression -- it is a
8975 postfix-expression. (The reason is that `(struct S) { 3 }.i'
8976 is legal; if the compound-literal were a cast-expression,
8977 you'd need an extra set of parentheses.) But, if we parse
8978 the type-id, and it happens to be a class-specifier, then we
8979 will commit to the parse at that point, because we cannot
8980 undo the action that is done when creating a new class. So,
8981 then we cannot back up and do a postfix-expression.
8983 Another tricky case is the following (c++/29234):
8985 struct S { void operator () (); };
8987 void foo ()
8988 {
8989 ( S()() );
8990 }
8992 As a type-id we parse the parenthesized S()() as a function
8993 returning a function, groktypename complains and we cannot
8994 back up in this case either.
8996 Therefore, we scan ahead to the closing `)', and check to see
8997 if the tokens after the `)' can start a cast-expression. Otherwise
8998 we are dealing with an unary-expression, a postfix-expression
8999 or something else.
9001 Yet another tricky case, in C++11, is the following (c++/54891):
9003 (void)[]{};
9005 The issue is that usually, besides the case of lambda-expressions,
9006 the parenthesized type-id cannot be followed by '[', and, eg, we
9007 want to parse '(C ())[2];' in parse/pr26997.C as unary-expression.
9008 Thus, if cp_parser_tokens_start_cast_expression returns -1, below
9009 we don't commit, we try a cast-expression, then an unary-expression.
9011 Save tokens so that we can put them back. */
9014 /* We may be looking at a cast-expression. */
9017 cast_expression
9020 /* Roll back the tokens we skipped. */
9022 /* If we aren't looking at a cast-expression, simulate an error so
9023 that the call to cp_parser_error_occurred below returns true. */
9026 else
9027 {
9030 /* Look for the type-id. */
9032 /* Look for the closing `)'. */
9037 }
9039 /* Restore the saved message. */
9042 /* At this point this can only be either a cast or a
9043 parenthesized ctor such as `(T ())' that looks like a cast to
9044 function returning T. */
9046 {
9047 /* Only commit if the cast-expression doesn't start with
9048 '++', '--', or '[' in C++11. */
9056 pidk);
9059 {
9060 /* Warn about old-style casts, if so requested. */
9065 {
9071 }
9073 /* Only type conversions to integral or enumeration types
9074 can be used in constant-expressions. */
9077 NIC_CAST))
9080 /* Perform the cast. */
9081 /* Make a location:
9082 (TYPE) EXPR
9083 ^~~~~~~~~~~
9084 with start==caret at the open paren, extending to the
9085 end of "expr". */
9087 open_paren_loc,
9091 }
9092 }
9093 else
9095 }
9097 /* If we get here, then it's not a cast, so it must be a
9098 unary-expression. */
9101 }
9103 /* Parse a binary expression of the general form:
9105 pm-expression:
9106 cast-expression
9107 pm-expression .* cast-expression
9108 pm-expression ->* cast-expression
9110 multiplicative-expression:
9111 pm-expression
9112 multiplicative-expression * pm-expression
9113 multiplicative-expression / pm-expression
9114 multiplicative-expression % pm-expression
9116 additive-expression:
9117 multiplicative-expression
9118 additive-expression + multiplicative-expression
9119 additive-expression - multiplicative-expression
9121 shift-expression:
9122 additive-expression
9123 shift-expression << additive-expression
9124 shift-expression >> additive-expression
9126 relational-expression:
9127 shift-expression
9128 relational-expression < shift-expression
9129 relational-expression > shift-expression
9130 relational-expression <= shift-expression
9131 relational-expression >= shift-expression
9133 GNU Extension:
9135 relational-expression:
9136 relational-expression <? shift-expression
9137 relational-expression >? shift-expression
9139 equality-expression:
9140 relational-expression
9141 equality-expression == relational-expression
9142 equality-expression != relational-expression
9144 and-expression:
9145 equality-expression
9146 and-expression & equality-expression
9148 exclusive-or-expression:
9149 and-expression
9150 exclusive-or-expression ^ and-expression
9152 inclusive-or-expression:
9153 exclusive-or-expression
9154 inclusive-or-expression | exclusive-or-expression
9156 logical-and-expression:
9157 inclusive-or-expression
9158 logical-and-expression && inclusive-or-expression
9160 logical-or-expression:
9161 logical-and-expression
9162 logical-or-expression || logical-and-expression
9164 All these are implemented with a single function like:
9166 binary-expression:
9167 simple-cast-expression
9168 binary-expression <token> binary-expression
9170 CAST_P is true if this expression is the target of a cast.
9172 The binops_by_token map is used to get the tree codes for each <token> type.
9173 binary-expressions are associated according to a precedence table. */
9175 #define TOKEN_PRECEDENCE(token) \
9176 (((token->type == CPP_GREATER \
9177 || ((cxx_dialect != cxx98) && token->type == CPP_RSHIFT)) \
9178 && !parser->greater_than_is_operator_p) \
9179 ? PREC_NOT_OPERATOR \
9180 : binops_by_token[token->type].prec)
9182 static cp_expr
9188 {
9189 cp_parser_expression_stack stack;
9191 cp_parser_expression_stack_entry current;
9192 cp_expr rhs;
9196 tree overload;
9198 /* Parse the first expression. */
9209 {
9210 /* Get an operator token. */
9216 {
9218 "%<>>%> operator is treated"
9222 }
9227 /* This is a fold-expression; handle it later. */
9230 /* Popping an entry off the stack means we completed a subexpression:
9231 - either we found a token which is not an operator (`>' where it is not
9232 an operator, or prec == PREC_NOT_OPERATOR), in which case popping
9233 will happen repeatedly;
9234 - or, we found an operator which has lower priority. This is the case
9235 where the recursive descent *ascends*, as in `3 * 4 + 5' after
9236 parsing `3 * 4'. */
9238 {
9241 else
9243 }
9245 get_rhs:
9249 /* We used the operator token. */
9252 /* For "false && x" or "true || x", x will never be executed;
9253 disable warnings while evaluating it. */
9255 c_inhibit_evaluation_warnings +=
9258 c_inhibit_evaluation_warnings +=
9261 /* Extract another operand. It may be the RHS of this expression
9262 or the LHS of a new, higher priority expression. */
9267 /* Get another operator token. Look up its precedence to avoid
9268 building a useless (immediately popped) stack entry for common
9269 cases such as 3 + 4 + 5 or 3 * 4 + 5. */
9276 {
9277 /* ... and prepare to parse the RHS of the new, higher priority
9278 expression. Since precedence levels on the stack are
9279 monotonically increasing, we do not have to care about
9280 stack overflows. */
9289 pop:
9291 /* If the stack is not empty, we have parsed into LHS the right side
9292 (`4' in the example above) of an expression we had suspended.
9293 We can use the information on the stack to recover the LHS (`3')
9294 from the stack together with the tree code (`MULT_EXPR'), and
9295 the precedence of the higher level subexpression
9296 (`PREC_ADDITIVE_EXPRESSION'). TOKEN is the CPP_PLUS token,
9297 which will be used to actually build the additive expression. */
9302 }
9304 /* Undo the disabling of warnings done above. */
9306 c_inhibit_evaluation_warnings -=
9309 c_inhibit_evaluation_warnings -=
9315 /* Avoid warning for !!x == y. */
9320 /* Avoid warning for !b == y where b is boolean. */
9324 /* Avoid warning for !!b == y where b is boolean. */
9337 /* ??? Currently we pass lhs_type == ERROR_MARK and rhs_type ==
9338 ERROR_MARK for everything that is not a binary expression.
9339 This makes warn_about_parentheses miss some warnings that
9340 involve unary operators. For unary expressions we should
9341 pass the correct tree_code unless the unary expression was
9342 surrounded by parentheses.
9343 */
9347 {
9350 else
9351 {
9352 current.lhs
9355 == tcc_comparison
9359 }
9360 }
9361 else
9362 {
9367 /* TODO: build_x_binary_op doesn't always honor the location. */
9369 }
9372 /* If the binary operator required the use of an overloaded operator,
9373 then this expression cannot be an integral constant-expression.
9374 An overloaded operator can be used even if both operands are
9375 otherwise permissible in an integral constant-expression if at
9376 least one of the operands is of enumeration type. */
9380 NIC_OVERLOADED))
9382 }
9385 }
9387 static cp_expr
9392 {
9395 }
9397 /* Parse the `? expression : assignment-expression' part of a
9398 conditional-expression. The LOGICAL_OR_EXPR is the
9399 logical-or-expression that started the conditional-expression.
9400 Returns a representation of the entire conditional-expression.
9402 This routine is used by cp_parser_assignment_expression.
9404 ? expression : assignment-expression
9406 GNU Extensions:
9408 ? : assignment-expression */
9410 static tree
9412 {
9414 cp_expr assignment_expr;
9418 /* Consume the `?' token. */
9423 {
9426 /* Implicit true clause. */
9428 c_inhibit_evaluation_warnings +=
9431 }
9432 else
9433 {
9436 /* Parse the expression. */
9437 c_inhibit_evaluation_warnings +=
9440 c_inhibit_evaluation_warnings +=
9444 }
9446 /* The next token should be a `:'. */
9448 /* Parse the assignment-expression. */
9450 c_inhibit_evaluation_warnings -=
9453 /* Make a location:
9454 LOGICAL_OR_EXPR ? EXPR : ASSIGNMENT_EXPR
9455 ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
9456 with the caret at the "?", ranging from the start of
9457 the logical_or_expr to the end of the assignment_expr. */
9462 /* Build the conditional-expression. */
9464 expr,
9465 assignment_expr,
9466 tf_warning_or_error);
9467 }
9469 /* Parse an assignment-expression.
9471 assignment-expression:
9472 conditional-expression
9473 logical-or-expression assignment-operator assignment_expression
9474 throw-expression
9476 CAST_P is true if this expression is the target of a cast.
9477 DECLTYPE_P is true if this expression is the operand of decltype.
9479 Returns a representation for the expression. */
9481 static cp_expr
9484 {
9485 cp_expr expr;
9487 /* If the next token is the `throw' keyword, then we're looking at
9488 a throw-expression. */
9491 /* Otherwise, it must be that we are looking at a
9492 logical-or-expression. */
9493 else
9494 {
9495 /* Parse the binary expressions (logical-or-expression). */
9497 decltype_p,
9499 /* If the next token is a `?' then we're actually looking at a
9500 conditional-expression. */
9503 else
9504 {
9507 /* If it's an assignment-operator, we're using the second
9508 production. */
9509 enum tree_code assignment_operator
9512 {
9515 /* Parse the right-hand side of the assignment. */
9522 /* An assignment may not appear in a
9523 constant-expression. */
9525 NIC_ASSIGNMENT))
9527 /* Build the assignment expression. Its default
9528 location:
9529 LHS = RHS
9530 ~~~~^~~~~
9531 is the location of the '=' token as the
9532 caret, ranging from the start of the lhs to the
9533 end of the rhs. */
9538 assignment_operator,
9539 rhs,
9541 /* TODO: build_x_modify_expr doesn't honor the location,
9542 so we must set it here. */
9544 }
9545 }
9546 }
9549 }
9551 /* Parse an (optional) assignment-operator.
9553 assignment-operator: one of
9554 = *= /= %= += -= >>= <<= &= ^= |=
9556 GNU Extension:
9558 assignment-operator: one of
9559 <?= >?=
9561 If the next token is an assignment operator, the corresponding tree
9562 code is returned, and the token is consumed. For example, for
9563 `+=', PLUS_EXPR is returned. For `=' itself, the code returned is
9564 NOP_EXPR. For `/', TRUNC_DIV_EXPR is returned; for `%',
9565 TRUNC_MOD_EXPR is returned. If TOKEN is not an assignment
9566 operator, ERROR_MARK is returned. */
9568 static enum tree_code
9570 {
9574 /* Peek at the next token. */
9578 {
9624 /* Nothing else is an assignment operator. */
9626 }
9628 /* An operator followed by ... is a fold-expression, handled elsewhere. */
9633 /* If it was an assignment operator, consume it. */
9638 }
9640 /* Parse an expression.
9642 expression:
9643 assignment-expression
9644 expression , assignment-expression
9646 CAST_P is true if this expression is the target of a cast.
9647 DECLTYPE_P is true if this expression is the immediate operand of decltype,
9648 except possibly parenthesized or on the RHS of a comma (N3276).
9650 Returns a representation of the expression. */
9652 static cp_expr
9655 {
9660 {
9661 cp_expr assignment_expression;
9663 /* Parse the next assignment-expression. */
9664 assignment_expression
9667 /* We don't create a temporary for a call that is the immediate operand
9668 of decltype or on the RHS of a comma. But when we see a comma, we
9669 need to create a temporary for a call on the LHS. */
9674 assignment_expression
9678 /* If this is the first assignment-expression, we can just
9679 save it away. */
9682 else
9683 {
9684 /* Create a location with caret at the comma, ranging
9685 from the start of the LHS to the end of the RHS. */
9690 assignment_expression,
9693 }
9694 /* If the next token is not a comma, or we're in a fold-expression, then
9695 we are done with the expression. */
9699 /* Consume the `,'. */
9702 /* A comma operator cannot appear in a constant-expression. */
9705 }
9708 }
9710 /* Parse a constant-expression.
9712 constant-expression:
9713 conditional-expression
9715 If ALLOW_NON_CONSTANT_P a non-constant expression is silently
9716 accepted. If ALLOW_NON_CONSTANT_P is true and the expression is not
9717 constant, *NON_CONSTANT_P is set to TRUE. If ALLOW_NON_CONSTANT_P
9718 is false, NON_CONSTANT_P should be NULL. If STRICT_P is true,
9719 only parse a conditional-expression, otherwise parse an
9720 assignment-expression. See below for rationale. */
9722 static cp_expr
9727 {
9731 cp_expr expression;
9733 /* It might seem that we could simply parse the
9734 conditional-expression, and then check to see if it were
9735 TREE_CONSTANT. However, an expression that is TREE_CONSTANT is
9736 one that the compiler can figure out is constant, possibly after
9737 doing some simplifications or optimizations. The standard has a
9738 precise definition of constant-expression, and we must honor
9739 that, even though it is somewhat more restrictive.
9741 For example:
9743 int i[(2, 3)];
9745 is not a legal declaration, because `(2, 3)' is not a
9746 constant-expression. The `,' operator is forbidden in a
9747 constant-expression. However, GCC's constant-folding machinery
9748 will fold this operation to an INTEGER_CST for `3'. */
9750 /* Save the old settings. */
9752 saved_allow_non_integral_constant_expression_p
9755 /* We are now parsing a constant-expression. */
9757 parser->allow_non_integral_constant_expression_p
9760 /* Although the grammar says "conditional-expression", when not STRICT_P,
9761 we parse an "assignment-expression", which also permits
9762 "throw-expression" and the use of assignment operators. In the case
9763 that ALLOW_NON_CONSTANT_P is false, we get better errors than we would
9764 otherwise. In the case that ALLOW_NON_CONSTANT_P is true, it is
9765 actually essential that we look for an assignment-expression.
9766 For example, cp_parser_initializer_clauses uses this function to
9767 determine whether a particular assignment-expression is in fact
9768 constant. */
9770 {
9771 /* Parse the binary expressions (logical-or-expression). */
9774 /* If the next token is a `?' then we're actually looking at
9775 a conditional-expression; otherwise we're done. */
9778 }
9779 else
9781 /* Restore the old settings. */
9782 parser->integral_constant_expression_p
9784 parser->allow_non_integral_constant_expression_p
9787 {
9788 /* Require an rvalue constant expression here; that's what our
9789 callers expect. Reference constant expressions are handled
9790 separately in e.g. cp_parser_template_argument. */
9799 }
9802 parser->non_integral_constant_expression_p
9806 }
9808 /* Parse __builtin_offsetof.
9810 offsetof-expression:
9811 "__builtin_offsetof" "(" type-id "," offsetof-member-designator ")"
9813 offsetof-member-designator:
9814 id-expression
9815 | offsetof-member-designator "." id-expression
9816 | offsetof-member-designator "[" expression "]"
9817 | offsetof-member-designator "->" id-expression */
9819 static cp_expr
9821 {
9823 tree type;
9824 cp_expr expr;
9825 cp_id_kind dummy;
9827 location_t finish_loc;
9829 /* We're about to accept non-integral-constant things, but will
9830 definitely yield an integral constant expression. Save and
9831 restore these values around our local parsing. */
9837 /* Consume the "__builtin_offsetof" token. */
9839 /* Consume the opening `('. */
9840 matching_parens parens;
9842 /* Parse the type-id. */
9844 {
9846 parser->type_definition_forbidden_message
9850 }
9851 /* Look for the `,'. */
9855 /* Build the (type *)null that begins the traditional offsetof macro. */
9856 tree object_ptr
9858 tf_warning_or_error);
9860 /* Parse the offsetof-member-designator. We begin as if we saw "expr->". */
9864 {
9867 {
9869 /* offsetof-member-designator "[" expression "]" */
9875 /* offsetof-member-designator "->" identifier */
9878 /* FALLTHRU */
9881 /* offsetof-member-designator "." identifier */
9889 /* Consume the ")" token. */
9895 /* Error. We know the following require will fail, but
9896 that gives the proper error message. */
9901 }
9902 }
9904 success:
9905 /* Make a location of the form:
9906 __builtin_offsetof (struct s, f)
9907 ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
9908 with caret at the type-id, ranging from the start of the
9909 "_builtin_offsetof" token to the close paren. */
9911 /* The result will be an INTEGER_CST, so we need to explicitly
9912 preserve the location. */
9915 failure:
9921 }
9923 /* Parse a trait expression.
9925 Returns a representation of the expression, the underlying type
9926 of the type at issue when KEYWORD is RID_UNDERLYING_TYPE. */
9928 static cp_expr
9930 {
9931 cp_trait_kind kind;
9937 {
10039 }
10041 /* Get location of initial token. */
10044 /* Consume the token. */
10047 matching_parens parens;
10050 {
10053 }
10059 {
10062 {
10065 }
10069 }
10071 {
10073 {
10077 {
10080 }
10084 }
10085 }
10090 /* Construct a location of the form:
10091 __is_trivially_copyable(_Tp)
10092 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
10093 with start == caret, finishing at the close-paren. */
10096 /* Complete the trait expression, which may mean either processing
10097 the trait expr now or saving it for template instantiation. */
10099 {
10108 }
10109 }
10111 /* Parse a lambda expression.
10113 lambda-expression:
10114 lambda-introducer lambda-declarator [opt] compound-statement
10116 Returns a representation of the expression. */
10118 static cp_expr
10120 {
10122 tree type;
10130 {
10132 {
10136 }
10138 }
10140 {
10142 {
10145 }
10147 }
10149 /* We may be in the middle of deferred access check. Disable
10150 it now. */
10161 /* Do this again now that LAMBDA_EXPR_EXTRA_SCOPE is set. */
10164 /* Now that we've started the type, add the capture fields for any
10165 explicit captures. */
10168 {
10169 /* Inside the class, surrounding template-parameter-lists do not apply. */
10170 unsigned int saved_num_template_parameter_lists
10174 bool fully_implicit_function_template_p
10178 bool auto_is_implicit_function_template_parm_p
10189 /* By virtue of defining a local class, a lambda expression has access to
10190 the private variables of enclosing classes. */
10198 {
10203 }
10205 {
10208 }
10210 /* The capture list was built up in reverse order; fix that now. */
10222 parser->fully_implicit_function_template_p
10226 parser->auto_is_implicit_function_template_parm_p
10228 }
10230 /* This field is only used during parsing of the lambda. */
10233 /* This lambda shouldn't have any proxies left at this point. */
10235 /* And now that we're done, push proxies for an enclosing lambda. */
10238 /* Update the lambda expression to a range. */
10246 else
10254 }
10256 /* Parse the beginning of a lambda expression.
10258 lambda-introducer:
10259 [ lambda-capture [opt] ]
10261 LAMBDA_EXPR is the current representation of the lambda expression. */
10263 static void
10265 {
10266 /* Need commas after the first capture. */
10269 /* Eat the leading `['. */
10272 /* Record default capture mode. "[&" "[=" "[&," "[=," */
10280 {
10283 }
10286 {
10288 tree capture_id;
10289 tree capture_init_expr;
10293 enum capture_kind_type
10294 {
10295 BY_COPY,
10296 BY_REFERENCE
10297 };
10301 {
10304 }
10308 else
10311 /* Possibly capture `this'. */
10313 {
10324 explicit_init_p);
10326 }
10328 /* Possibly capture `*this'. */
10331 {
10342 explicit_init_p);
10344 }
10346 /* Remember whether we want to capture as a reference or not. */
10348 {
10351 }
10353 /* Get the identifier. */
10358 /* Would be nice to have a cp_parser_skip_to_closing_x for general
10359 delimiters, but I modified this to stop on unnested ']' as well. It
10360 was already changed to stop on unnested '}', so the
10361 "closing_parenthesis" name is no more misleading with my change. */
10362 {
10368 }
10370 /* Find the initializer for this capture. */
10374 {
10376 /* An explicit initializer exists. */
10379 "lambda capture initializers "
10385 {
10388 }
10389 }
10390 else
10391 {
10394 /* Turn the identifier into an id-expression. */
10395 capture_init_expr
10400 {
10403 }
10406 {
10409 capture_init_expr);
10414 }
10417 {
10420 capture_init_expr))
10424 }
10426 capture_init_expr
10427 = finish_id_expression
10429 capture_init_expr,
10443 {
10446 }
10447 }
10451 {
10456 capture_id);
10460 "capture of %qD redundant with by-reference capture "
10462 }
10465 capture_id,
10466 capture_init_expr,
10468 explicit_init_p);
10470 /* If there is any qualification still in effect, clear it
10471 now; we will be starting fresh with the next capture. */
10475 }
10478 }
10480 /* Parse the (optional) middle of a lambda expression.
10482 lambda-declarator:
10483 < template-parameter-list [opt] >
10484 ( parameter-declaration-clause [opt] )
10485 attribute-specifier [opt]
10486 decl-specifier-seq [opt]
10487 exception-specification [opt]
10488 lambda-return-type-clause [opt]
10490 LAMBDA_EXPR is the current representation of the lambda expression. */
10492 static bool
10494 {
10495 /* 5.1.1.4 of the standard says:
10496 If a lambda-expression does not include a lambda-declarator, it is as if
10497 the lambda-declarator were ().
10498 This means an empty parameter list, no attributes, and no exception
10499 specification. */
10506 cp_decl_specifier_seq lambda_specs;
10509 /* The template-parameter-list is optional, but must begin with
10510 an opening angle if present. */
10512 {
10515 "lambda templates are only available with "
10519 "lambda templates are only available with "
10528 /* We just processed one more parameter list. */
10530 }
10532 /* The parameter-declaration-clause is optional (unless
10533 template-parameter-list was given), but must begin with an
10534 opening parenthesis if present. */
10536 {
10537 matching_parens parens;
10542 /* Parse parameters. */
10545 /* Default arguments shall not be specified in the
10546 parameter-declaration-clause of a lambda-declarator. */
10557 /* In the decl-specifier-seq of the lambda-declarator, each
10558 decl-specifier shall either be mutable or constexpr. */
10562 CP_PARSER_FLAGS_ONLY_MUTABLE_OR_CONSTEXPR,
10565 {
10570 }
10574 /* Parse optional exception specification. */
10577 /* Parse optional trailing return type. */
10579 {
10582 }
10584 /* The function parameters must be in scope all the way until after the
10585 trailing-return-type in case of decltype. */
10587 }
10591 /* Create the function call operator.
10593 Messing with declarators like this is no uglier than building up the
10594 FUNCTION_DECL by hand, and this is less likely to get out of sync with
10595 other code. */
10596 {
10597 cp_decl_specifier_seq return_type_specs;
10599 tree fco;
10607 {
10611 else
10614 }
10623 VIRT_SPEC_UNSPECIFIED,
10624 REF_QUAL_NONE,
10625 tx_qual,
10626 exception_spec,
10634 declarator,
10635 attributes);
10637 {
10640 /* Give the object parameter a different name. */
10642 }
10644 {
10648 }
10657 }
10658 }
10660 /* Parse the body of a lambda expression, which is simply
10662 compound-statement
10664 but which requires special handling.
10665 LAMBDA_EXPR is the current representation of the lambda expression. */
10667 static void
10669 {
10676 else
10677 /* Still increment function_depth so that we don't GC in the
10678 middle of an expression. */
10683 /* Clear this in case we're in the middle of a default argument. */
10687 {
10691 matching_braces braces;
10694 {
10697 /* Originally C++11 required us to peek for 'return expr'; and
10698 process it specially here to deduce the return type. N3638
10699 removed the need for that. */
10707 }
10710 }
10717 else
10719 }
10721 /* Statements [gram.stmt.stmt] */
10723 /* Build and add a DEBUG_BEGIN_STMT statement with location LOC. */
10725 static void
10727 {
10731 /* A concept is never expanded normally. */
10737 }
10739 /* Parse a statement.
10741 statement:
10742 labeled-statement
10743 expression-statement
10744 compound-statement
10745 selection-statement
10746 iteration-statement
10747 jump-statement
10748 declaration-statement
10749 try-block
10751 C++11:
10753 statement:
10754 labeled-statement
10755 attribute-specifier-seq (opt) expression-statement
10756 attribute-specifier-seq (opt) compound-statement
10757 attribute-specifier-seq (opt) selection-statement
10758 attribute-specifier-seq (opt) iteration-statement
10759 attribute-specifier-seq (opt) jump-statement
10760 declaration-statement
10761 attribute-specifier-seq (opt) try-block
10763 init-statement:
10764 expression-statement
10765 simple-declaration
10767 TM Extension:
10769 statement:
10770 atomic-statement
10772 IN_COMPOUND is true when the statement is nested inside a
10773 cp_parser_compound_statement; this matters for certain pragmas.
10775 If IF_P is not NULL, *IF_P is set to indicate whether the statement
10776 is a (possibly labeled) if statement which is not enclosed in braces
10777 and has an else clause. This is used to implement -Wparentheses.
10779 CHAIN is a vector of if-else-if conditions. */
10781 static void
10785 {
10790 restart:
10793 /* There is no statement yet. */
10799 /* In obj-c++, seeing '[[' might be the either the beginning of
10800 c++11 attributes, or a nested objc-message-expression. So
10801 let's parse the c++11 attributes tentatively. */
10805 {
10808 }
10810 /* Peek at the next token. */
10812 /* Remember the location of the first token in the statement. */
10815 /* If this is a keyword, then that will often determine what kind of
10816 statement we have. */
10818 {
10822 {
10825 /* Looks like a labeled-statement with a case label.
10826 Parse the label, and then use tail recursion to parse
10827 the statement. */
10850 /* Objective-C++ exception-handling constructs. */
10864 /* This must be a namespace alias definition. */
10880 /* It might be a keyword like `int' that can start a
10881 declaration-statement. */
10883 }
10884 }
10886 {
10887 /* If the next token is a `:', then we are looking at a
10888 labeled-statement. */
10891 {
10892 /* Looks like a labeled-statement with an ordinary label.
10893 Parse the label, and then use tail recursion to parse
10894 the statement. */
10899 }
10900 }
10901 /* Anything that starts with a `{' must be a compound-statement. */
10904 /* CPP_PRAGMA is a #pragma inside a function body, which constitutes
10905 a statement all its own. */
10907 {
10908 /* Only certain OpenMP pragmas are attached to statements, and thus
10909 are considered statements themselves. All others are not. In
10910 the context of a compound, accept the pragma as a "statement" and
10911 return so that we can check for a close brace. Otherwise we
10912 require a real statement and must go back and read one. */
10918 }
10920 {
10923 }
10925 /* Everything else must be a declaration-statement or an
10926 expression-statement. Try for the declaration-statement
10927 first, unless we are looking at a `;', in which case we know that
10928 we have an expression-statement. */
10930 {
10932 {
10934 {
10935 /* Attributes should be parsed as part of the the
10936 declaration, so let's un-parse them. */
10939 }
10942 /* Try to parse the declaration-statement. */
10944 /* If that worked, we're done. */
10947 }
10948 /* All preceding labels have been parsed at this point. */
10952 /* Look for an expression-statement instead. */
10955 /* Handle [[fallthrough]];. */
10957 {
10958 /* The next token after the fallthrough attribute is ';'. */
10960 {
10961 /* Turn [[fallthrough]]; into FALLTHROUGH ();. */
10963 IFN_FALLTHROUGH,
10966 }
10967 else
10971 }
10972 }
10974 /* Set the line number for the statement. */
10978 /* Allow "[[fallthrough]];", but warn otherwise. */
10981 OPT_Wattributes,
10983 }
10985 /* Append ATTR to attribute list ATTRS. */
10987 static tree
10989 {
10995 }
10997 /* Parse the label for a labeled-statement, i.e.
10999 identifier :
11000 case constant-expression :
11001 default :
11003 GNU Extension:
11004 case constant-expression ... constant-expression : statement
11006 When a label is parsed without errors, the label is added to the
11007 parse tree by the finish_* functions, so this function doesn't
11008 have to return the label. */
11010 static void
11012 {
11017 /* The next token should be an identifier. */
11021 {
11024 }
11026 /* Remember whether this case or a user-defined label is allowed to fall
11027 through to. */
11032 {
11034 {
11038 /* Consume the `case' token. */
11040 /* Parse the constant-expression. */
11047 {
11048 /* Consume the `...' token. */
11054 /* We don't need to emit warnings here, as the common code
11055 will do this for us. */
11056 }
11057 else
11061 {
11065 }
11066 else
11069 expr);
11070 }
11074 /* Consume the `default' token. */
11078 {
11082 }
11083 else
11088 /* Anything else must be an ordinary label. */
11093 }
11095 /* Require the `:' token. */
11098 /* An ordinary label may optionally be followed by attributes.
11099 However, this is only permitted if the attributes are then
11100 followed by a semicolon. This is because, for backward
11101 compatibility, when parsing
11102 lab: __attribute__ ((unused)) int i;
11103 we want the attribute to attach to "i", not "lab". */
11106 {
11107 tree attrs;
11114 ;
11115 else
11117 }
11123 }
11125 /* Parse an expression-statement.
11127 expression-statement:
11128 expression [opt] ;
11130 Returns the new EXPR_STMT -- or NULL_TREE if the expression
11131 statement consists of nothing more than an `;'. IN_STATEMENT_EXPR_P
11132 indicates whether this expression-statement is part of an
11133 expression statement. */
11135 static tree
11137 {
11142 /* There might be attribute fallthrough. */
11145 /* If the next token is a ';', then there is no expression
11146 statement. */
11148 {
11152 {
11155 }
11156 }
11158 /* Handle [[fallthrough]];. */
11160 {
11161 /* The next token after the fallthrough attribute is ';'. */
11163 /* Turn [[fallthrough]]; into FALLTHROUGH ();. */
11166 else
11170 }
11172 /* Allow "[[fallthrough]];", but warn otherwise. */
11177 /* Give a helpful message for "A<T>::type t;" and the like. */
11180 {
11187 {
11188 /* A::A a; */
11193 }
11194 }
11196 /* Consume the final `;'. */
11201 /* This is the final expression statement of a statement
11202 expression. */
11208 }
11210 /* Parse a compound-statement.
11212 compound-statement:
11213 { statement-seq [opt] }
11215 GNU extension:
11217 compound-statement:
11218 { label-declaration-seq [opt] statement-seq [opt] }
11220 label-declaration-seq:
11221 label-declaration
11222 label-declaration-seq label-declaration
11224 Returns a tree representing the statement. */
11226 static tree
11229 {
11230 tree compound_stmt;
11231 matching_braces braces;
11233 /* Consume the `{'. */
11240 /* Begin the compound-statement. */
11242 /* If the next keyword is `__label__' we have a label declaration. */
11245 /* Parse an (optional) statement-seq. */
11247 /* Finish the compound-statement. */
11249 /* Consume the `}'. */
11253 }
11255 /* Parse an (optional) statement-seq.
11257 statement-seq:
11258 statement
11259 statement-seq [opt] statement */
11261 static void
11263 {
11264 /* Scan statements until there aren't any more. */
11266 {
11269 /* If we are looking at a `}', then we have run out of
11270 statements; the same is true if we have reached the end
11271 of file, or have stumbled upon a stray '@end'. */
11278 /* If we are in a compound statement and find 'else' then
11279 something went wrong. */
11281 {
11284 else
11285 {
11288 }
11289 }
11291 /* Parse the statement. */
11293 }
11294 }
11296 /* Return true if this is the C++20 version of range-based-for with
11297 init-statement. */
11299 static bool
11301 {
11304 /* Save tokens so that we can put them back. */
11307 /* There has to be an unnested ; followed by an unnested :. */
11310 CPP_SEMICOLON,
11314 /* We found the semicolon, eat it now. */
11317 /* Now look for ':' that is not nested in () or {}. */
11320 CPP_COLON,
11323 out:
11324 /* Roll back the tokens we skipped. */
11328 }
11330 /* Return true if we're looking at (init; cond), false otherwise. */
11332 static bool
11334 {
11335 /* Save tokens so that we can put them back. */
11338 /* Look for ';' that is not nested in () or {}. */
11341 CPP_SEMICOLON,
11344 /* Roll back the tokens we skipped. */
11348 }
11350 /* Parse a selection-statement.
11352 selection-statement:
11353 if ( init-statement [opt] condition ) statement
11354 if ( init-statement [opt] condition ) statement else statement
11355 switch ( init-statement [opt] condition ) statement
11357 Returns the new IF_STMT or SWITCH_STMT.
11359 If IF_P is not NULL, *IF_P is set to indicate whether the statement
11360 is a (possibly labeled) if statement which is not enclosed in
11361 braces and has an else clause. This is used to implement
11362 -Wparentheses.
11364 CHAIN is a vector of if-else-if conditions. This is used to implement
11365 -Wduplicated-cond. */
11367 static tree
11370 {
11373 token_indent_info guard_tinfo;
11378 /* Peek at the next token. */
11382 /* See what kind of keyword it is. */
11385 {
11388 {
11389 tree statement;
11390 tree condition;
11395 RID_CONSTEXPR))
11396 {
11402 }
11404 /* Look for the `('. */
11405 matching_parens parens;
11407 {
11410 }
11412 /* Begin the selection-statement. */
11414 {
11417 }
11418 else
11421 /* Parse the optional init-statement. */
11423 {
11424 tree decl;
11427 "init-statement in selection statements only available "
11430 }
11432 /* Parse the condition. */
11434 /* Look for the `)'. */
11440 {
11444 /* Add the condition. */
11451 /* Parse the then-clause. */
11455 /* Outside a template, the non-selected branch of a constexpr
11456 if is a 'discarded statement', i.e. unevaluated. */
11461 {
11464 }
11467 guard_tinfo);
11474 {
11478 }
11480 /* If the next token is `else', parse the else-clause. */
11482 RID_ELSE))
11483 {
11487 {
11490 }
11492 guard_tinfo
11494 /* Consume the `else' keyword. */
11497 {
11499 RID_IF)
11501 {
11502 /* We've got "if (COND) else if (COND2)". Start
11503 the condition chain and add COND as the first
11504 element. */
11508 {
11509 /* Wrap it in a NOP_EXPR so that we can set the
11510 location of the condition. */
11512 condition);
11515 }
11516 }
11518 RID_IF))
11519 {
11520 /* This is if-else without subsequent if. Zap the
11521 condition chain; we would have already warned at
11522 this point. */
11525 }
11526 }
11528 /* Parse the else-clause. */
11534 /* If we are currently parsing a then-clause, then
11535 IF_P will not be NULL. We set it to true to
11536 indicate that this if statement has an else clause.
11537 This may trigger the Wparentheses warning below
11538 when we get back up to the parent if statement. */
11543 {
11547 }
11548 }
11549 else
11550 {
11551 /* This if statement does not have an else clause. If
11552 NESTED_IF is true, then the then-clause has an if
11553 statement which does have an else clause. We warn
11554 about the potential ambiguity. */
11557 "suggest explicit braces to avoid ambiguous"
11560 {
11561 /* We don't need the condition chain anymore. */
11564 }
11565 }
11567 /* Now we're all done with the if-statement. */
11569 }
11570 else
11571 {
11575 /* Add the condition. */
11578 /* Parse the body of the switch-statement. */
11584 guard_tinfo);
11588 /* Now we're all done with the switch-statement. */
11590 }
11593 }
11599 }
11600 }
11602 /* Helper function for cp_parser_condition and cp_parser_simple_declaration.
11603 If we have seen at least one decl-specifier, and the next token
11604 is not a parenthesis, then we must be looking at a declaration.
11605 (After "int (" we might be looking at a functional cast.) */
11607 static void
11610 {
11616 }
11618 /* Helper function for cp_parser_condition. Enforces [stmt.stmt]/2:
11619 The declarator shall not specify a function or an array. Returns
11620 TRUE if the declarator is valid, FALSE otherwise. */
11622 static bool
11625 location_t loc)
11626 {
11630 {
11635 else
11643 }
11644 else
11646 }
11648 /* Parse a condition.
11650 condition:
11651 expression
11652 type-specifier-seq declarator = initializer-clause
11653 type-specifier-seq declarator braced-init-list
11655 GNU Extension:
11657 condition:
11658 type-specifier-seq declarator asm-specification [opt]
11659 attributes [opt] = assignment-expression
11661 Returns the expression that should be tested. */
11663 static tree
11665 {
11666 cp_decl_specifier_seq type_specifiers;
11670 /* Try the declaration first. */
11672 /* New types are not allowed in the type-specifier-seq for a
11673 condition. */
11675 parser->type_definition_forbidden_message
11677 /* Parse the type-specifier-seq. */
11679 CP_PARSER_FLAGS_ONLY_TYPE_OR_CONSTEXPR,
11682 /* Restore the saved message. */
11688 /* If all is well, we might be looking at a declaration. */
11690 {
11691 tree decl;
11692 tree asm_specification;
11693 tree attributes;
11698 /* Parse the declarator. */
11704 /* Parse the attributes. */
11706 /* Parse the asm-specification. */
11708 /* If the next token is not an `=' or '{', then we might still be
11709 looking at an expression. For example:
11711 if (A(a).x)
11713 looks like a decl-specifier-seq and a declarator -- but then
11714 there is no `=', so this is an expression. */
11719 /* If we did see an `=' or '{', then we are looking at a declaration
11720 for sure. */
11722 {
11723 tree pushed_scope;
11730 /* Create the declaration. */
11736 /* Parse the initializer. */
11738 {
11742 }
11744 {
11745 /* Consume the `='. */
11749 }
11750 else
11751 {
11754 }
11758 /* Process the initializer. */
11761 asm_specification,
11762 flags);
11768 }
11769 }
11770 /* If we didn't even get past the declarator successfully, we are
11771 definitely not looking at a declaration. */
11772 else
11775 /* Otherwise, we are looking at an expression. */
11777 }
11779 /* Parses a for-statement or range-for-statement until the closing ')',
11780 not included. */
11782 static tree
11784 {
11788 /* Begin the for-statement. */
11791 /* Parse the initialization. */
11796 else
11798 }
11800 static tree
11803 {
11804 /* Normal for loop */
11807 tree stmt;
11810 /* The init-statement has already been parsed in
11811 cp_parser_init_statement, so no work is needed here. */
11814 /* If there's a condition, process it. */
11818 {
11822 }
11824 {
11828 }
11830 /* Look for the `;'. */
11833 /* If there's an expression, process it. */
11839 }
11841 /* Tries to parse a range-based for-statement:
11843 range-based-for:
11844 decl-specifier-seq declarator : expression
11846 The decl-specifier-seq declarator and the `:' are already parsed by
11847 cp_parser_init_statement. If processing_template_decl it returns a
11848 newly created RANGE_FOR_STMT; if not, it is converted to a
11849 regular FOR_STMT. */
11851 static tree
11854 {
11861 /* Get the range declaration momentarily out of the way so that
11862 the range expression doesn't clash with it. */
11864 {
11866 {
11868 /* For decomposition declaration get all of the corresponding
11869 declarations out of the way. */
11873 {
11879 {
11885 }
11886 }
11887 }
11889 {
11894 }
11895 }
11898 {
11901 }
11902 else
11905 /* Put the range declaration(s) back into scope. */
11907 {
11911 }
11913 /* If in template, STMT is converted to a normal for-statement
11914 at instantiation. If not, it is done just ahead. */
11916 {
11926 /* do_auto_deduction doesn't mess with template init-lists. */
11929 }
11930 else
11931 {
11935 unroll);
11936 }
11938 }
11940 /* Subroutine of cp_convert_range_for: given the initializer expression,
11941 builds up the range temporary. */
11943 static tree
11945 {
11948 /* Find out the type deduced by the declaration
11949 `auto &&__range = range_expr'. */
11954 /* Create the __range variable. */
11956 range_type);
11961 }
11963 /* Used by cp_parser_range_for in template context: we aren't going to
11964 do a full conversion yet, but we still need to resolve auto in the
11965 type of the for-range-declaration if present. This is basically
11966 a shortcut version of cp_convert_range_for. */
11968 static void
11970 {
11973 {
11976 iter_type = (cp_parser_perform_range_for_lookup
11979 {
11981 iter_type);
11983 RO_UNARY_STAR,
11984 tf_warning_or_error);
11987 }
11988 }
11989 }
11991 /* Converts a range-based for-statement into a normal
11992 for-statement, as per the definition.
11994 for (RANGE_DECL : RANGE_EXPR)
11995 BLOCK
11997 should be equivalent to:
11999 {
12000 auto &&__range = RANGE_EXPR;
12001 for (auto __begin = BEGIN_EXPR, end = END_EXPR;
12002 __begin != __end;
12003 ++__begin)
12004 {
12005 RANGE_DECL = *__begin;
12006 BLOCK
12007 }
12008 }
12010 If RANGE_EXPR is an array:
12011 BEGIN_EXPR = __range
12012 END_EXPR = __range + ARRAY_SIZE(__range)
12013 Else if RANGE_EXPR has a member 'begin' or 'end':
12014 BEGIN_EXPR = __range.begin()
12015 END_EXPR = __range.end()
12016 Else:
12017 BEGIN_EXPR = begin(__range)
12018 END_EXPR = end(__range);
12020 If __range has a member 'begin' but not 'end', or vice versa, we must
12021 still use the second alternative (it will surely fail, however).
12022 When calling begin()/end() in the third alternative we must use
12023 argument dependent lookup, but always considering 'std' as an associated
12024 namespace. */
12026 tree
12030 {
12038 /* If an error happened previously do nothing or else a lot of
12039 unhelpful errors would be issued. */
12041 else
12042 {
12043 tree range_temp;
12047 /* Can't bind a reference to an array of runtime bound. */
12049 else
12050 {
12055 LOOKUP_ONLYCONVERTING);
12057 }
12060 }
12062 /* The new for initialization statement. */
12064 iter_type);
12070 LOOKUP_ONLYCONVERTING);
12080 LOOKUP_ONLYCONVERTING);
12084 /* The new for condition. */
12091 /* The new increment expression. */
12094 tf_warning_or_error);
12100 /* The declaration is initialized with *__begin inside the loop body. */
12103 tf_warning_or_error),
12105 LOOKUP_ONLYCONVERTING);
12110 }
12112 /* Solves BEGIN_EXPR and END_EXPR as described in cp_convert_range_for.
12113 We need to solve both at the same time because the method used
12114 depends on the existence of members begin or end.
12115 Returns the type deduced for the iterator expression. */
12117 static tree
12119 {
12121 {
12124 }
12127 {
12132 }
12134 {
12135 /* If RANGE is an array, we will use pointer arithmetic. */
12138 range,
12142 }
12143 else
12144 {
12145 /* If it is not an array, we must do a bit of magic. */
12155 tf_warning_or_error);
12158 tf_warning_or_error);
12161 {
12162 /* Use the member functions. */
12165 }
12166 else
12167 {
12168 /* Use global functions with ADL. */
12175 tf_warning_or_error);
12177 tf_warning_or_error);
12179 tf_warning_or_error);
12181 tf_warning_or_error);
12184 }
12186 /* Last common checks. */
12188 {
12189 /* If one of the expressions is an error do no more checks. */
12192 }
12195 /* Can happen, when, eg, in a template context, Koenig lookup
12196 can't resolve begin/end (c++/58503). */
12198 else
12199 {
12201 /* The unqualified type of the __begin and __end temporaries should
12202 be the same, as required by the multiple auto declaration. */
12204 {
12211 /* P0184R0 allows __begin and __end to have different types,
12212 but make sure they are comparable so we can give a better
12214 else
12218 }
12220 }
12221 }
12222 }
12224 /* Helper function for cp_parser_perform_range_for_lookup.
12225 Builds a tree for RANGE.IDENTIFIER(). */
12227 static tree
12229 {
12242 tf_warning_or_error);
12245 }
12247 /* Parse an iteration-statement.
12249 iteration-statement:
12250 while ( condition ) statement
12251 do statement while ( expression ) ;
12252 for ( init-statement condition [opt] ; expression [opt] )
12253 statement
12255 Returns the new WHILE_STMT, DO_STMT, FOR_STMT or RANGE_FOR_STMT. */
12257 static tree
12260 {
12263 tree statement;
12265 token_indent_info guard_tinfo;
12267 /* Peek at the next token. */
12274 /* Remember whether or not we are already within an iteration
12275 statement. */
12278 /* See what kind of keyword it is. */
12281 {
12283 {
12284 tree condition;
12286 /* Begin the while-statement. */
12288 /* Look for the `('. */
12289 matching_parens parens;
12291 /* Parse the condition. */
12294 /* Look for the `)'. */
12296 /* Parse the dependent statement. */
12302 /* We're done with the while-statement. */
12304 }
12308 {
12309 tree expression;
12311 /* Begin the do-statement. */
12313 /* Parse the body of the do-statement. */
12320 /* Look for the `while' keyword. */
12322 /* Look for the `('. */
12323 matching_parens parens;
12325 /* Parse the expression. */
12327 /* We're done with the do-statement. */
12329 /* Look for the `)'. */
12331 /* Look for the `;'. */
12333 }
12337 {
12338 /* Look for the `('. */
12339 matching_parens parens;
12344 /* Look for the `)'. */
12347 /* Parse the body of the for-statement. */
12354 /* We're done with the for-statement. */
12356 }
12363 }
12366 }
12368 /* Parse a init-statement or the declarator of a range-based-for.
12369 Returns true if a range-based-for declaration is seen.
12371 init-statement:
12372 expression-statement
12373 simple-declaration */
12375 static bool
12377 {
12378 /* If the next token is a `;', then we have an empty
12379 expression-statement. Grammatically, this is also a
12380 simple-declaration, but an invalid one, because it does not
12381 declare anything. Therefore, if we did not handle this case
12382 specially, we would issue an error message about an invalid
12383 declaration. */
12385 {
12389 /* Try to parse the init-statement. */
12391 {
12392 tree dummy;
12394 /* Parse the declaration. */
12400 /* That didn't work, try to parse it as an expression-statement. */
12404 {
12406 "range-based %<for%> loops with initializer only "
12409 }
12410 }
12412 /* A colon is used in range-based for. */
12415 /* We're going to speculatively look for a declaration, falling back
12416 to an expression, if necessary. */
12418 /* Parse the declaration. */
12421 decl);
12424 {
12425 /* It is a range-for, consume the ':'. */
12430 "range-based %<for%> loops only available with "
12432 }
12433 else
12434 /* The ';' is not consumed yet because we told
12435 cp_parser_simple_declaration not to. */
12440 /* If the tentative parse failed, then we shall need to look for an
12441 expression-statement. */
12442 }
12443 /* If we are here, it is an expression-statement. */
12446 }
12448 /* Parse a jump-statement.
12450 jump-statement:
12451 break ;
12452 continue ;
12453 return expression [opt] ;
12454 return braced-init-list ;
12455 goto identifier ;
12457 GNU extension:
12459 jump-statement:
12460 goto * expression ;
12462 Returns the new BREAK_STMT, CONTINUE_STMT, RETURN_EXPR, or GOTO_EXPR. */
12464 static tree
12466 {
12472 /* Peek at the next token. */
12477 /* See what kind of keyword it is. */
12480 {
12484 {
12501 }
12507 {
12511 /* Fall through. */
12521 }
12526 {
12527 tree expr;
12531 {
12535 }
12538 else
12539 /* If the next token is a `;', then there is no
12540 expression. */
12542 /* Build the return-statement. */
12545 else
12547 /* Look for the final `;'. */
12549 }
12555 {
12558 }
12560 /* Create the goto-statement. */
12562 {
12563 /* Issue a warning about this use of a GNU extension. */
12565 /* Consume the '*' token. */
12567 /* Parse the dependent expression. */
12569 }
12570 else
12572 /* Look for the final `;'. */
12579 }
12582 }
12584 /* Parse a declaration-statement.
12586 declaration-statement:
12587 block-declaration */
12589 static void
12591 {
12594 /* Get the high-water mark for the DECLARATOR_OBSTACK. */
12597 /* Parse the block-declaration. */
12600 /* Free any declarators allocated. */
12602 }
12604 /* Some dependent statements (like `if (cond) statement'), are
12605 implicitly in their own scope. In other words, if the statement is
12606 a single statement (as opposed to a compound-statement), it is
12607 none-the-less treated as if it were enclosed in braces. Any
12608 declarations appearing in the dependent statement are out of scope
12609 after control passes that point. This function parses a statement,
12610 but ensures that is in its own scope, even if it is not a
12611 compound-statement.
12613 If IF_P is not NULL, *IF_P is set to indicate whether the statement
12614 is a (possibly labeled) if statement which is not enclosed in
12615 braces and has an else clause. This is used to implement
12616 -Wparentheses.
12618 CHAIN is a vector of if-else-if conditions. This is used to implement
12619 -Wduplicated-cond.
12621 Returns the new statement. */
12623 static tree
12627 {
12628 tree statement;
12631 token_indent_info body_tinfo
12637 /* Mark if () ; with a special NOP_EXPR. */
12639 {
12650 }
12651 /* if a compound is opened, we simply parse the statement directly. */
12654 /* If the token is not a `{', then we must take special action. */
12655 else
12656 {
12657 /* Create a compound-statement. */
12659 /* Parse the dependent-statement. */
12662 /* Finish the dummy compound-statement. */
12664 }
12666 token_indent_info next_tinfo
12675 /* Return the statement. */
12677 }
12679 /* For some dependent statements (like `while (cond) statement'), we
12680 have already created a scope. Therefore, even if the dependent
12681 statement is a compound-statement, we do not want to create another
12682 scope. */
12684 static void
12687 {
12688 /* If the token is a `{', then we must take special action. */
12690 {
12691 token_indent_info body_tinfo
12697 token_indent_info next_tinfo
12706 }
12707 else
12708 {
12709 /* Avoid calling cp_parser_compound_statement, so that we
12710 don't create a new scope. Do everything else by hand. */
12711 matching_braces braces;
12713 /* If the next keyword is `__label__' we have a label declaration. */
12716 /* Parse an (optional) statement-seq. */
12719 }
12720 }
12722 /* Declarations [gram.dcl.dcl] */
12724 /* Parse an optional declaration-sequence.
12726 declaration-seq:
12727 declaration
12728 declaration-seq declaration */
12730 static void
12732 {
12734 {
12745 {
12746 /* A declaration consisting of a single semicolon is
12747 invalid. Allow it unless we're being pedantic. */
12752 }
12754 /* If we're entering or exiting a region that's implicitly
12755 extern "C", modify the lang context appropriately. */
12757 {
12760 }
12762 {
12765 }
12768 {
12769 /* A top-level declaration can consist solely of a #pragma.
12770 A nested declaration cannot, so this is done here and not
12771 in cp_parser_declaration. (A #pragma at block scope is
12772 handled in cp_parser_statement.) */
12775 }
12777 /* Parse the declaration itself. */
12779 }
12780 }
12782 /* Parse a declaration.
12784 declaration:
12785 block-declaration
12786 function-definition
12787 template-declaration
12788 explicit-instantiation
12789 explicit-specialization
12790 linkage-specification
12791 namespace-definition
12793 C++17:
12794 deduction-guide
12796 GNU extension:
12798 declaration:
12799 __extension__ declaration */
12801 static void
12803 {
12804 cp_token token1;
12805 cp_token token2;
12810 /* Check for the `__extension__' keyword. */
12812 {
12813 /* Parse the qualified declaration. */
12815 /* Restore the PEDANTIC flag. */
12819 }
12821 /* Try to figure out what kind of declaration is present. */
12826 else
12827 {
12830 }
12832 /* Get the high-water mark for the DECLARATOR_OBSTACK. */
12835 /* If the next token is `extern' and the following token is a string
12836 literal, then we have a linkage specification. */
12840 /* If the next token is `template', then we have either a template
12841 declaration, an explicit instantiation, or an explicit
12842 specialization. */
12844 {
12845 /* `template <>' indicates a template specialization. */
12849 /* `template <' indicates a template declaration. */
12852 /* Anything else must be an explicit instantiation. */
12853 else
12855 }
12856 /* If the next token is `export', then we have a template
12857 declaration. */
12860 /* If the next token is `extern', 'static' or 'inline' and the one
12861 after that is `template', we have a GNU extended explicit
12862 instantiation directive. */
12869 /* If the next token is `namespace', check for a named or unnamed
12870 namespace definition. */
12879 /* An unnamed namespace definition. */
12883 /* An inline (associated) namespace definition. */
12887 /* Objective-C++ declaration/definition. */
12894 /* At this point we may have a template declared by a concept
12895 introduction. */
12900 else
12901 /* Try to parse a block-declaration, or a function-definition. */
12904 /* Free any declarators allocated. */
12906 }
12908 /* Parse a block-declaration.
12910 block-declaration:
12911 simple-declaration
12912 asm-definition
12913 namespace-alias-definition
12914 using-declaration
12915 using-directive
12917 GNU Extension:
12919 block-declaration:
12920 __extension__ block-declaration
12922 C++0x Extension:
12924 block-declaration:
12925 static_assert-declaration
12927 If STATEMENT_P is TRUE, then this block-declaration is occurring as
12928 part of a declaration-statement. */
12930 static void
12933 {
12937 /* Check for the `__extension__' keyword. */
12939 {
12940 /* Parse the qualified declaration. */
12942 /* Restore the PEDANTIC flag. */
12946 }
12948 /* Peek at the next token to figure out which kind of declaration is
12949 present. */
12952 /* If the next keyword is `asm', we have an asm-definition. */
12954 {
12958 }
12959 /* If the next keyword is `namespace', we have a
12960 namespace-alias-definition. */
12963 /* If the next keyword is `using', we have a
12964 using-declaration, a using-directive, or an alias-declaration. */
12966 {
12971 /* If the token after `using' is `namespace', then we have a
12972 using-directive. */
12976 /* If the second token after 'using' is '=', then we have an
12977 alias-declaration. */
12983 /* Otherwise, it's a using-declaration. */
12984 else
12987 }
12988 /* If the next keyword is `__label__' we have a misplaced label
12989 declaration. */
12991 {
12995 /* If the next token is now a `;', consume it. */
12998 }
12999 /* If the next token is `static_assert' we have a static assertion. */
13002 /* Anything else must be a simple-declaration. */
13003 else
13006 }
13008 /* Parse a simple-declaration.
13010 simple-declaration:
13011 decl-specifier-seq [opt] init-declarator-list [opt] ;
13012 decl-specifier-seq ref-qualifier [opt] [ identifier-list ]
13013 brace-or-equal-initializer ;
13015 init-declarator-list:
13016 init-declarator
13017 init-declarator-list , init-declarator
13019 If FUNCTION_DEFINITION_ALLOWED_P is TRUE, then we also recognize a
13020 function-definition as a simple-declaration.
13022 If MAYBE_RANGE_FOR_DECL is not NULL, the pointed tree will be set to the
13023 parsed declaration if it is an uninitialized single declarator not followed
13024 by a `;', or to error_mark_node otherwise. Either way, the trailing `;',
13025 if present, will not be consumed. */
13027 static void
13031 {
13032 cp_decl_specifier_seq decl_specifiers;
13041 /* Defer access checks until we know what is being declared; the
13042 checks for names appearing in the decl-specifier-seq should be
13043 done as if we were in the scope of the thing being declared. */
13046 /* Parse the decl-specifier-seq. We have to keep track of whether
13047 or not the decl-specifier-seq declares a named class or
13048 enumeration type, since that is the only case in which the
13049 init-declarator-list is allowed to be empty.
13051 [dcl.dcl]
13053 In a simple-declaration, the optional init-declarator-list can be
13054 omitted only when declaring a class or enumeration, that is when
13055 the decl-specifier-seq contains either a class-specifier, an
13056 elaborated-type-specifier, or an enum-specifier. */
13058 CP_PARSER_FLAGS_OPTIONAL,
13061 /* We no longer need to defer access checks. */
13064 /* In a block scope, a valid declaration must always have a
13065 decl-specifier-seq. By not trying to parse declarators, we can
13066 resolve the declaration/expression ambiguity more quickly. */
13069 {
13072 }
13074 /* If the next two tokens are both identifiers, the code is
13075 erroneous. The usual cause of this situation is code like:
13077 T t;
13079 where "T" should name a type -- but does not. */
13082 {
13083 /* If parsing tentatively, we should commit; we really are
13084 looking at a declaration. */
13086 /* Give up. */
13088 }
13093 /* Look for C++17 decomposition declaration. */
13101 {
13102 tree decl
13104 maybe_range_for_decl,
13107 /* The next token should be either a `,' or a `;'. */
13109 /* If it's a `;', we are done. */
13113 {
13117 }
13118 /* Anything else is an error. */
13119 else
13120 {
13121 /* If we have already issued an error message we don't need
13122 to issue another one. */
13127 /* Skip tokens until we reach the end of the statement. */
13129 /* If the next token is now a `;', consume it. */
13133 }
13134 }
13135 else
13138 tree last_type;
13140 /* NULL_TREE if both variable and function declaration are allowed,
13141 error_mark_node if function declaration are not allowed and
13142 a FUNCTION_DECL that should be diagnosed if it is followed by
13143 variable declarations. */
13144 tree auto_function_declaration;
13147 auto_specifier_p
13151 /* Keep going until we hit the `;' at the end of the simple
13152 declaration. */
13155 CPP_SEMICOLON))
13156 {
13159 tree decl;
13163 {
13164 /* If we are processing next declarator, comma is expected */
13169 {
13173 }
13174 }
13175 else
13178 /* Parse the init-declarator. */
13181 function_definition_allowed_p,
13183 declares_class_or_enum,
13185 maybe_range_for_decl,
13188 /* If an error occurred while parsing tentatively, exit quickly.
13189 (That usually happens when in the body of a function; each
13190 statement is treated as a declaration-statement until proven
13191 otherwise.) */
13196 {
13197 /* If the init-declarator-list contains more than one
13198 init-declarator, they shall all form declarations of
13199 variables. */
13201 auto_function_declaration
13205 {
13207 "non-variable %qD in declaration with more than one "
13212 }
13213 }
13217 {
13221 {
13222 /* If the list of declarators contains more than one declarator,
13223 the type of each declared variable is determined as described
13224 above. If the type deduced for the template parameter U is not
13225 the same in each deduction, the program is ill-formed. */
13230 }
13231 else
13233 }
13235 /* Handle function definitions specially. */
13237 {
13238 /* If the next token is a `,', then we are probably
13239 processing something like:
13241 void f() {}, *p;
13243 which is erroneous. */
13245 {
13248 "mixing"
13250 }
13251 /* Otherwise, we're done with the list of declarators. */
13252 else
13253 {
13256 }
13257 }
13260 /* The next token should be either a `,' or a `;'. */
13262 /* If it's a `,', there are more declarators to come. */
13265 /* If it's a `;', we are done. */
13269 {
13274 }
13275 /* Anything else is an error. */
13276 else
13277 {
13278 /* If we have already issued an error message we don't need
13279 to issue another one. */
13284 /* Skip tokens until we reach the end of the statement. */
13286 /* If the next token is now a `;', consume it. */
13290 }
13291 /* After the first time around, a function-definition is not
13292 allowed -- even if it was OK at first. For example:
13294 int i, f() {}
13296 is not valid. */
13298 }
13300 /* Issue an error message if no declarators are present, and the
13301 decl-specifier-seq does not itself declare a class or
13302 enumeration: [dcl.dcl]/3. */
13304 {
13306 {
13310 /* Ensure an error is issued anyway when finish_decltype_type,
13311 called via cp_parser_decl_specifier_seq, returns a class or
13312 an enumeration (c++/51786). */
13315 }
13316 /* Perform any deferred access checks. */
13318 }
13320 /* Consume the `;'. */
13321 finish:
13325 {
13331 }
13333 done:
13335 }
13337 /* Helper of cp_parser_simple_declaration, parse a decomposition declaration.
13338 decl-specifier-seq ref-qualifier [opt] [ identifier-list ]
13339 initializer ; */
13341 static tree
13346 {
13351 /* Parse the identifier-list. */
13355 {
13363 }
13367 {
13373 else
13374 {
13377 }
13378 }
13384 tree pushed_scope;
13391 NULL_TREE);
13398 cp_expr e;
13399 cp_decl_specifier_seq decl_specs;
13404 {
13407 else
13410 tree elt_pushed_scope;
13416 {
13417 /* Ensure we've diagnosed redeclaration if we aren't creating
13418 a new VAR_DECL. */
13421 }
13422 else
13426 }
13429 {
13432 }
13436 {
13444 || (is_direct_init
13447 {
13451 }
13454 {
13459 }
13460 }
13462 {
13464 /* Ensure DECL_VALUE_EXPR is created for all the decls but
13465 the underlying DECL. */
13467 }
13473 {
13476 }
13479 }
13481 /* Parse a decl-specifier-seq.
13483 decl-specifier-seq:
13484 decl-specifier-seq [opt] decl-specifier
13485 decl-specifier attribute-specifier-seq [opt] (C++11)
13487 decl-specifier:
13488 storage-class-specifier
13489 type-specifier
13490 function-specifier
13491 friend
13492 typedef
13494 GNU Extension:
13496 decl-specifier:
13497 attributes
13499 Concepts Extension:
13501 decl-specifier:
13502 concept
13504 Set *DECL_SPECS to a representation of the decl-specifier-seq.
13506 The parser flags FLAGS is used to control type-specifier parsing.
13508 *DECLARES_CLASS_OR_ENUM is set to the bitwise or of the following
13509 flags:
13511 1: one of the decl-specifiers is an elaborated-type-specifier
13512 (i.e., a type declaration)
13513 2: one of the decl-specifiers is an enum-specifier or a
13514 class-specifier (i.e., a type definition)
13516 */
13518 static void
13520 cp_parser_flags flags,
13523 {
13527 cp_decl_spec ds;
13529 /* Clear DECL_SPECS. */
13532 /* Assume no class or enumeration type is declared. */
13535 /* Keep reading specifiers until there are no more to read. */
13537 {
13542 /* Peek at the next token. */
13545 /* Save the first token of the decl spec list for error
13546 reporting. */
13549 /* Handle attributes. */
13551 {
13552 /* Parse the attributes. */
13555 /* In a sequence of declaration specifiers, c++11 attributes
13556 appertain to the type that precede them. In that case
13557 [dcl.spec]/1 says:
13559 The attribute-specifier-seq affects the type only for
13560 the declaration it appears in, not other declarations
13561 involving the same type.
13563 But for now let's force the user to position the
13564 attribute either at the beginning of the declaration or
13565 after the declarator-id, which would clearly mean that it
13566 applies to the declarator. */
13568 {
13570 /* The c++11 attribute is at the beginning of the
13571 declaration. It appertains to the entity being
13573 else
13574 {
13576 {
13577 /* This is an attribute following a
13578 class-specifier. */
13583 }
13584 else
13585 {
13586 decl_specs->std_attributes
13590 }
13592 }
13593 }
13595 decl_specs->attributes
13600 }
13601 /* Assume we will find a decl-specifier keyword. */
13603 /* If the next token is an appropriate keyword, we can simply
13604 add it to the list. */
13606 {
13607 /* decl-specifier:
13608 friend
13609 constexpr */
13612 {
13617 }
13618 else
13619 {
13621 /* Consume the token. */
13623 }
13636 /* function-specifier:
13637 inline
13638 virtual
13639 explicit */
13646 /* decl-specifier:
13647 typedef */
13650 /* Consume the token. */
13652 /* A constructor declarator cannot appear in a typedef. */
13654 /* The "typedef" keyword can only occur in a declaration; we
13655 may as well commit at this point. */
13662 /* storage-class-specifier:
13663 auto
13664 register
13665 static
13666 extern
13667 mutable
13669 GNU Extension:
13670 thread */
13673 {
13674 /* Consume the token. */
13677 /* Complain about `auto' as a storage specifier, if
13678 we're complaining about C++0x compatibility. */
13682 "%<auto%> changes meaning in C++11; "
13685 /* Set the storage class anyway. */
13687 token);
13688 }
13689 else
13690 /* C++0x auto type-specifier. */
13698 /* Consume the token. */
13701 token);
13704 /* Consume the token. */
13710 /* We did not yet find a decl-specifier yet. */
13713 }
13730 /* Constructors are a special case. The `S' in `S()' is not a
13731 decl-specifier; it is the beginning of the declarator. */
13732 constructor_p
13733 = (!found_decl_spec
13734 && constructor_possible_p
13735 && (cp_parser_constructor_declarator_p
13738 /* If we don't have a DECL_SPEC yet, then we must be looking at
13739 a type-specifier. */
13741 {
13744 tree type_spec;
13746 type_spec
13748 decl_specs,
13754 /* If this type-specifier referenced a user-defined type
13755 (a typedef, class-name, etc.), then we can't allow any
13756 more such type-specifiers henceforth.
13758 [dcl.spec]
13760 The longest sequence of decl-specifiers that could
13761 possibly be a type name is taken as the
13762 decl-specifier-seq of a declaration. The sequence shall
13763 be self-consistent as described below.
13765 [dcl.type]
13767 As a general rule, at most one type-specifier is allowed
13768 in the complete decl-specifier-seq of a declaration. The
13769 only exceptions are the following:
13771 -- const or volatile can be combined with any other
13772 type-specifier.
13774 -- signed or unsigned can be combined with char, long,
13775 short, or int.
13777 -- ..
13779 Example:
13781 typedef char* Pc;
13782 void g (const int Pc);
13784 Here, Pc is *not* part of the decl-specifier seq; it's
13785 the declarator. Therefore, once we see a type-specifier
13786 (other than a cv-qualifier), we forbid any additional
13787 user-defined types. We *do* still allow things like `int
13788 int' to be considered a decl-specifier-seq, and issue the
13789 error message later. */
13792 /* A constructor declarator cannot follow a type-specifier. */
13794 {
13802 }
13803 }
13805 /* If we still do not have a DECL_SPEC, then there are no more
13806 decl-specifiers. */
13811 /* After we see one decl-specifier, further decl-specifiers are
13812 always optional. */
13814 }
13816 /* Don't allow a friend specifier with a class definition. */
13821 }
13823 /* Parse an (optional) storage-class-specifier.
13825 storage-class-specifier:
13826 auto
13827 register
13828 static
13829 extern
13830 mutable
13832 GNU Extension:
13834 storage-class-specifier:
13835 thread
13837 Returns an IDENTIFIER_NODE corresponding to the keyword used. */
13839 static tree
13841 {
13843 {
13847 /* Fall through for C++98. */
13855 /* Consume the token. */
13860 }
13861 }
13863 /* Parse an (optional) function-specifier.
13865 function-specifier:
13866 inline
13867 virtual
13868 explicit
13870 Returns an IDENTIFIER_NODE corresponding to the keyword used.
13871 Updates DECL_SPECS, if it is non-NULL. */
13873 static tree
13876 {
13879 {
13885 /* 14.5.2.3 [temp.mem]
13887 A member function template shall not be virtual. */
13891 else
13901 }
13903 /* Consume the token. */
13905 }
13907 /* Parse a linkage-specification.
13909 linkage-specification:
13910 extern string-literal { declaration-seq [opt] }
13911 extern string-literal declaration */
13913 static void
13915 {
13916 tree linkage;
13918 /* Look for the `extern' keyword. */
13919 cp_token *extern_token
13922 /* Look for the string-literal. */
13926 /* Transform the literal into an identifier. If the literal is a
13927 wide-character string, or contains embedded NULs, then we can't
13928 handle it as the user wants. */
13931 {
13933 /* Assume C++ linkage. */
13935 }
13936 else
13939 /* We're now using the new linkage. */
13942 /* Preserve the location of the the innermost linkage specification,
13943 tracking the locations of nested specifications via a local. */
13944 location_t saved_location
13946 /* Construct a location ranging from the start of the "extern" to
13947 the end of the string-literal, with the caret at the start, e.g.:
13948 extern "C" {
13949 ^~~~~~~~~~
13950 */
13951 parser->innermost_linkage_specification_location
13956 /* If the next token is a `{', then we're using the first
13957 production. */
13959 {
13963 /* Consume the `{' token. */
13964 matching_braces braces;
13966 /* Parse the declarations. */
13968 /* Look for the closing `}'. */
13970 }
13971 /* Otherwise, there's just one declaration. */
13972 else
13973 {
13976 saved_in_unbraced_linkage_specification_p
13980 parser->in_unbraced_linkage_specification_p
13982 }
13984 /* We're done with the linkage-specification. */
13987 /* Restore location of parent linkage specification, if any. */
13989 }
13991 /* Parse a static_assert-declaration.
13993 static_assert-declaration:
13994 static_assert ( constant-expression , string-literal ) ;
13995 static_assert ( constant-expression ) ; (C++17)
13997 If MEMBER_P, this static_assert is a class member. */
13999 static void
14001 {
14002 cp_expr condition;
14003 location_t token_loc;
14004 tree message;
14007 /* Peek at the `static_assert' token so we can keep track of exactly
14008 where the static assertion started. */
14011 /* Look for the `static_assert' keyword. */
14013 RT_STATIC_ASSERT))
14016 /* We know we are in a static assertion; commit to any tentative
14017 parse. */
14021 /* Parse the `(' starting the static assertion condition. */
14022 matching_parens parens;
14025 /* Parse the constant-expression. Allow a non-constant expression
14026 here in order to give better diagnostics in finish_static_assert. */
14027 condition =
14033 {
14036 "static_assert without a message "
14038 /* Eat the ')' */
14043 }
14044 else
14045 {
14046 /* Parse the separating `,'. */
14049 /* Parse the string-literal message. */
14054 /* A `)' completes the static assertion. */
14060 }
14062 /* A semicolon terminates the declaration. */
14065 /* Get the location for the static assertion. Use that of the
14066 condition if available, otherwise, use that of the "static_assert"
14067 token. */
14072 /* Complete the static assertion, which may mean either processing
14073 the static assert now or saving it for template instantiation. */
14075 }
14077 /* Parse the expression in decltype ( expression ). */
14079 static tree
14082 {
14084 tree expr;
14086 /* Since we're going to preserve any side-effects from this parse, set up a
14087 firewall to protect our callers from cp_parser_commit_to_tentative_parse
14088 in the expression. */
14091 /* First, try parsing an id-expression. */
14102 {
14105 cp_id_kind idk;
14109 /* Lookup the name we got back from the id-expression. */
14114 /* A template without args is not a complete id-expression. */
14123 {
14124 /* Complete lookup of the id-expression. */
14125 expr = (finish_id_expression
14138 /* We found an id-expression, but it was something that we
14139 should not have found. This is an error, not something
14140 we can recover from, so note that we found an
14141 id-expression and we'll recover as gracefully as
14142 possible. */
14144 }
14149 /* We have an id-expression. */
14151 }
14154 {
14155 /* Abort the id-expression parse. */
14158 /* Parsing tentatively, again. */
14161 /* Parse a class member access. */
14169 /* We have an id-expression. */
14171 }
14174 /* We have parsed the complete id-expression or member access. */
14176 else
14177 {
14178 /* Abort our attempt to parse an id-expression or member access
14179 expression. */
14182 /* Commit to the tentative_firewall so we get syntax errors. */
14185 /* Parse a full expression. */
14188 }
14191 }
14193 /* Parse a `decltype' type. Returns the type.
14195 simple-type-specifier:
14196 decltype ( expression )
14197 C++14 proposal:
14198 decltype ( auto ) */
14200 static tree
14202 {
14207 {
14208 /* Already parsed. */
14211 }
14213 /* Look for the `decltype' token. */
14217 /* Parse the opening `('. */
14218 matching_parens parens;
14228 /* decltype (auto) */
14230 else
14231 {
14232 /* decltype (expression) */
14234 /* Types cannot be defined in a `decltype' expression. Save away the
14235 old message and set the new one. */
14237 parser->type_definition_forbidden_message
14240 /* The restrictions on constant-expressions do not apply inside
14241 decltype expressions. */
14242 bool saved_integral_constant_expression_p
14244 bool saved_non_integral_constant_expression_p
14248 /* Within a parenthesized expression, a `>' token is always
14249 the greater-than operator. */
14250 bool saved_greater_than_is_operator_p
14254 /* Do not actually evaluate the expression. */
14257 /* Do not warn about problems with the expression. */
14262 /* Go back to evaluating expressions. */
14266 /* The `>' token might be the end of a template-id or
14267 template-parameter-list now. */
14268 parser->greater_than_is_operator_p
14271 /* Restore the old message and the integral constant expression
14272 flags. */
14274 parser->integral_constant_expression_p
14276 parser->non_integral_constant_expression_p
14278 }
14280 /* Parse to the closing `)'. */
14282 {
14287 }
14290 {
14291 /* Build auto. */
14294 }
14295 else
14297 tf_warning_or_error);
14299 /* Replace the decltype with a CPP_DECLTYPE so we don't need to parse
14300 it again. */
14311 }
14313 /* Special member functions [gram.special] */
14315 /* Parse a conversion-function-id.
14317 conversion-function-id:
14318 operator conversion-type-id
14320 Returns an IDENTIFIER_NODE representing the operator. */
14322 static tree
14324 {
14325 tree type;
14326 tree saved_scope;
14327 tree saved_qualifying_scope;
14328 tree saved_object_scope;
14331 /* Look for the `operator' token. */
14334 /* When we parse the conversion-type-id, the current scope will be
14335 reset. However, we need that information in able to look up the
14336 conversion function later, so we save it here. */
14340 /* We must enter the scope of the class so that the names of
14341 entities declared within the class are available in the
14342 conversion-type-id. For example, consider:
14344 struct S {
14345 typedef int I;
14346 operator I();
14347 };
14349 S::operator I() { ... }
14351 In order to see that `I' is a type-name in the definition, we
14352 must be in the scope of `S'. */
14355 /* Parse the conversion-type-id. */
14357 /* Leave the scope of the class, if any. */
14360 /* Restore the saved scope. */
14364 /* If the TYPE is invalid, indicate failure. */
14368 }
14370 /* Parse a conversion-type-id:
14372 conversion-type-id:
14373 type-specifier-seq conversion-declarator [opt]
14375 Returns the TYPE specified. */
14377 static tree
14379 {
14380 tree attributes;
14381 cp_decl_specifier_seq type_specifiers;
14383 tree type_specified;
14386 /* Parse the attributes. */
14390 parser->type_definition_forbidden_message
14393 /* Parse the type-specifiers. */
14400 /* If that didn't work, stop. */
14403 /* Parse the conversion-declarator. */
14411 /* Don't give this error when parsing tentatively. This happens to
14412 work because we always parse this definitively once. */
14415 {
14417 {
14420 }
14424 }
14427 }
14429 /* Parse an (optional) conversion-declarator.
14431 conversion-declarator:
14432 ptr-operator conversion-declarator [opt]
14434 */
14438 {
14441 cp_cv_quals cv_quals;
14443 /* We don't know if there's a ptr-operator next, or not. */
14445 /* Try the ptr-operator. */
14448 /* If it worked, look for more conversion-declarators. */
14450 {
14453 /* Parse another optional declarator. */
14456 declarator = cp_parser_make_indirect_declarator
14460 }
14463 }
14465 /* Parse an (optional) ctor-initializer.
14467 ctor-initializer:
14468 : mem-initializer-list */
14470 static void
14472 {
14473 /* If the next token is not a `:', then there is no
14474 ctor-initializer. */
14476 {
14477 /* Do default initialization of any bases and members. */
14481 }
14483 /* Consume the `:' token. */
14485 /* And the mem-initializer-list. */
14487 }
14489 /* Parse a mem-initializer-list.
14491 mem-initializer-list:
14492 mem-initializer ... [opt]
14493 mem-initializer ... [opt] , mem-initializer-list */
14495 static void
14497 {
14502 /* Let the semantic analysis code know that we are starting the
14503 mem-initializer-list. */
14508 /* Loop through the list. */
14510 {
14511 tree mem_initializer;
14514 /* Parse the mem-initializer. */
14516 /* If the next token is a `...', we're expanding member initializers. */
14522 {
14523 /* Consume the `...'. */
14527 /* The TREE_PURPOSE must be a _TYPE, because base-specifiers
14528 can be expanded but members cannot. */
14531 {
14536 }
14538 /* Construct the pack expansion type. */
14541 }
14544 {
14548 }
14549 /* Look for a target constructor. */
14553 {
14556 {
14560 }
14562 }
14563 /* Add it to the list, unless it was erroneous. */
14565 {
14568 }
14569 /* If the next token is not a `,', we're done. */
14572 /* Consume the `,' token. */
14574 }
14576 /* Perform semantic analysis. */
14579 }
14581 /* Parse a mem-initializer.
14583 mem-initializer:
14584 mem-initializer-id ( expression-list [opt] )
14585 mem-initializer-id braced-init-list
14587 GNU extension:
14589 mem-initializer:
14590 ( expression-list [opt] )
14592 Returns a TREE_LIST. The TREE_PURPOSE is the TYPE (for a base
14593 class) or FIELD_DECL (for a non-static data member) to initialize;
14594 the TREE_VALUE is the expression-list. An empty initialization
14595 list is represented by void_list_node. */
14597 static tree
14599 {
14600 tree mem_initializer_id;
14601 tree expression_list;
14602 tree member;
14605 /* Find out what is being initialized. */
14607 {
14611 }
14612 else
14613 {
14617 }
14623 {
14630 }
14631 else
14632 {
14642 }
14652 }
14654 /* Parse a mem-initializer-id.
14656 mem-initializer-id:
14657 :: [opt] nested-name-specifier [opt] class-name
14658 decltype-specifier (C++11)
14659 identifier
14661 Returns a TYPE indicating the class to be initialized for the first
14662 production (and the second in C++11). Returns an IDENTIFIER_NODE
14663 indicating the data member to be initialized for the last production. */
14665 static tree
14667 {
14671 tree id;
14675 /* `typename' is not allowed in this context ([temp.res]). */
14677 {
14679 "keyword %<typename%> not allowed in this context (a qualified "
14682 }
14683 /* Look for the optional `::' operator. */
14684 global_scope_p
14688 /* Look for the optional nested-name-specifier. The simplest way to
14689 implement:
14691 [temp.res]
14693 The keyword `typename' is not permitted in a base-specifier or
14694 mem-initializer; in these contexts a qualified name that
14695 depends on a template-parameter is implicitly assumed to be a
14696 type name.
14698 is to assume that we have seen the `typename' keyword at this
14699 point. */
14700 nested_name_specifier_p
14709 /* If there is a `::' operator or a nested-name-specifier, then we
14710 are definitely looking for a class-name. */
14715 typename_type,
14719 /* Otherwise, we could also be looking for an ordinary identifier. */
14722 /* Try a decltype-specifier. */
14724 else
14725 /* Otherwise, try a class-name. */
14729 none_type,
14733 /* If we found one, we're done. */
14736 /* Otherwise, look for an ordinary identifier. */
14738 }
14740 /* Overloading [gram.over] */
14742 /* Parse an operator-function-id.
14744 operator-function-id:
14745 operator operator
14747 Returns an IDENTIFIER_NODE for the operator which is a
14748 human-readable spelling of the identifier, e.g., `operator +'. */
14750 static cp_expr
14752 {
14753 /* Look for the `operator' keyword. */
14756 /* And then the name of the operator itself. */
14758 }
14760 /* Return an identifier node for a user-defined literal operator.
14761 The suffix identifier is chained to the operator name identifier. */
14763 tree
14765 {
14766 tree identifier;
14773 }
14775 /* Parse an operator.
14777 operator:
14778 new delete new[] delete[] + - * / % ^ & | ~ ! = < >
14779 += -= *= /= %= ^= &= |= << >> >>= <<= == != <= >= &&
14780 || ++ -- , ->* -> () []
14782 GNU Extensions:
14784 operator:
14785 <? >? <?= >?=
14787 Returns an IDENTIFIER_NODE for the operator which is a
14788 human-readable spelling of the identifier, e.g., `operator +'. */
14790 static cp_expr
14792 {
14797 /* Peek at the next token. */
14802 /* Figure out which operator we have. */
14807 {
14809 {
14810 /* The keyword should be either `new' or `delete'. */
14815 else
14818 /* Consume the `new' or `delete' token. */
14821 /* Peek at the next token. */
14823 /* If it's a `[' token then this is the array variant of the
14824 operator. */
14826 {
14827 /* Consume the `[' token. */
14829 /* Look for the `]' token. */
14834 }
14838 }
14996 {
14997 /* Consume the `('. */
14998 matching_parens parens;
15000 /* Look for the matching `)'. */
15005 }
15008 /* Consume the `['. */
15010 /* Look for the matching `]'. */
15019 /* FALLTHRU */
15028 {
15035 /* Consume the string. */
15041 {
15044 }
15045 else
15046 {
15048 /* Look for the suffix identifier. */
15053 {
15057 }
15058 else
15059 {
15062 }
15063 }
15068 {
15071 }
15074 {
15077 }
15079 {
15082 }
15084 }
15087 /* Anything else is an error. */
15089 }
15091 /* If we have selected an identifier, we need to consume the
15092 operator token. */
15094 {
15098 }
15099 /* Otherwise, no valid operator name was present. */
15100 else
15101 {
15104 }
15107 }
15109 /* Parse a template-declaration.
15111 template-declaration:
15112 export [opt] template < template-parameter-list > declaration
15114 If MEMBER_P is TRUE, this template-declaration occurs within a
15115 class-specifier.
15117 The grammar rule given by the standard isn't correct. What
15118 is really meant is:
15120 template-declaration:
15121 export [opt] template-parameter-list-seq
15122 decl-specifier-seq [opt] init-declarator [opt] ;
15123 export [opt] template-parameter-list-seq
15124 function-definition
15126 template-parameter-list-seq:
15127 template-parameter-list-seq [opt]
15128 template < template-parameter-list >
15130 Concept Extensions:
15132 template-parameter-list-seq:
15133 template < template-parameter-list > requires-clause [opt]
15135 requires-clause:
15136 requires logical-or-expression */
15138 static void
15140 {
15141 /* Check for `export'. */
15143 {
15144 /* Consume the `export' token. */
15146 /* Warn that we do not support `export'. */
15148 }
15151 }
15153 /* Parse a template-parameter-list.
15155 template-parameter-list:
15156 template-parameter
15157 template-parameter-list , template-parameter
15159 Returns a TREE_LIST. Each node represents a template parameter.
15160 The nodes are connected via their TREE_CHAINs. */
15162 static tree
15164 {
15169 /* The loop below parses the template parms. We first need to know
15170 the total number of template parms to be able to compute proper
15171 canonical types of each dependent type. So after the loop, when
15172 we know the total number of template parms,
15173 end_template_parm_list computes the proper canonical types and
15174 fixes up the dependent types accordingly. */
15176 {
15177 tree parameter;
15180 location_t parm_loc;
15182 /* Parse the template-parameter. */
15187 /* Add it to the list. */
15190 parm_loc,
15191 parameter,
15192 is_non_type,
15193 is_parameter_pack);
15194 else
15195 {
15198 }
15200 /* If the next token is not a `,', we're done. */
15203 /* Otherwise, consume the `,' token. */
15205 }
15208 }
15210 /* Parse a introduction-list.
15212 introduction-list:
15213 introduced-parameter
15214 introduction-list , introduced-parameter
15216 introduced-parameter:
15217 ...[opt] identifier
15219 Returns a TREE_VEC of WILDCARD_DECLs. If the parameter is a pack
15220 then the introduced parm will have WILDCARD_PACK_P set. In addition, the
15221 WILDCARD_DECL will also have DECL_NAME set and token location in
15222 DECL_SOURCE_LOCATION. */
15224 static tree
15226 {
15230 {
15235 /* Build placeholder. */
15243 /* If the next token is not a `,', we're done. */
15246 /* Otherwise, consume the `,' token. */
15248 }
15250 /* Convert the vec into a TREE_VEC. */
15253 tree parm;
15259 }
15261 /* Given a declarator, get the declarator-id part, or NULL_TREE if this
15262 is an abstract declarator. */
15266 {
15271 }
15273 /* Get the unqualified-id from the DECLARATOR or NULL_TREE if this
15274 is an abstract declarator. */
15278 {
15282 else
15284 }
15286 /* Returns true if DECL represents a constrained-parameter. */
15290 {
15295 }
15297 /* Returns true if PARM declares a constrained-parameter. */
15301 {
15303 }
15305 /* Check that the type parameter is only a declarator-id, and that its
15306 type is not cv-qualified. */
15308 bool
15311 {
15316 {
15319 }
15321 /* Don't allow cv-qualified type parameters. */
15324 {
15327 }
15330 }
15332 /* Finish parsing/processing a template type parameter and checking
15333 various restrictions. */
15337 tree id,
15339 {
15342 else
15344 }
15346 static tree
15348 {
15349 /* FIXME: This should probably be copied, and we may need to adjust
15350 the template parameter depths. */
15360 }
15362 /* Finish parsing/processing a template template parameter by borrowing
15363 the template parameter list from the prototype parameter. */
15365 static tree
15367 tree proto,
15368 tree id,
15370 {
15374 }
15376 /* Create a new non-type template parameter from the given PARM
15377 declarator. */
15379 static tree
15382 {
15388 }
15390 /* Build a constrained template parameter based on the PARMDECL
15391 declarator. The type of PARMDECL is the constrained type, which
15392 refers to the prototype template parameter that ultimately
15393 specifies the type of the declared parameter. */
15395 static tree
15400 {
15406 /* A template parameter constrained by a variadic concept shall also
15407 be declared as a template parameter pack. */
15412 /* Build the parameter. Return an error if the declarator was invalid. */
15413 tree parm;
15418 parmdecl);
15419 else
15424 /* Finish the parameter decl and create a node attaching the
15425 default argument and constraint. */
15430 }
15432 /* Returns true if the parsed type actually represents the declaration
15433 of a type template-parameter. */
15437 {
15440 }
15443 /* Returns true if the parsed type actually represents the declaration of
15444 a template template-parameter. */
15446 static bool
15448 {
15451 }
15453 /* Parse a default argument for a type template-parameter.
15454 Note that diagnostics are handled in cp_parser_template_parameter. */
15456 static tree
15458 {
15461 /* Consume the `=' token. */
15466 /* Parse the default-argument. */
15472 {
15476 }
15479 }
15481 /* Parse a default argument for a template template-parameter. */
15483 static tree
15485 {
15490 /* Consume the `='. */
15492 /* Parse the id-expression. */
15494 /* save token before parsing the id-expression, for error
15495 reporting */
15497 tree default_argument
15505 /* If the id-expression was a template-id that refers to
15506 a template-class, we already have the declaration here,
15507 so no further lookup is needed. */
15508 ;
15509 else
15510 /* Look up the name. */
15511 default_argument
15513 none_type,
15519 /* See if the default argument is valid. */
15523 }
15525 /* Parse a template-parameter.
15527 template-parameter:
15528 type-parameter
15529 parameter-declaration
15531 If all goes well, returns a TREE_LIST. The TREE_VALUE represents
15532 the parameter. The TREE_PURPOSE is the default value, if any.
15533 Returns ERROR_MARK_NODE on failure. *IS_NON_TYPE is set to true
15534 iff this parameter is a non-type parameter. *IS_PARAMETER_PACK is
15535 set to true iff this parameter is a parameter pack. */
15537 static tree
15540 {
15543 tree parm;
15545 /* Assume it is a type parameter or a template parameter. */
15547 /* Assume it not a parameter pack. */
15549 /* Peek at the next token. */
15551 /* If it is `template', we have a type-parameter. */
15554 /* If it is `class' or `typename' we do not know yet whether it is a
15555 type parameter or a non-type parameter. Consider:
15557 template <typename T, typename T::X X> ...
15559 or:
15561 template <class C, class D*> ...
15563 Here, the first parameter is a type parameter, and the second is
15564 a non-type parameter. We can tell by looking at the token after
15565 the identifier -- if it is a `,', `=', or `>' then we have a type
15566 parameter. */
15568 {
15569 /* Peek at the token after `class' or `typename'. */
15571 /* If it's an ellipsis, we have a template type parameter
15572 pack. */
15575 /* If it's an identifier, skip it. */
15578 /* Now, see if the token looks like the end of a template
15579 parameter. */
15584 }
15586 /* Otherwise, it is a non-type parameter or a constrained parameter.
15588 [temp.param]
15590 When parsing a default template-argument for a non-type
15591 template-parameter, the first non-nested `>' is taken as the end
15592 of the template parameter-list rather than a greater-than
15593 operator. */
15594 parameter_declarator
15601 /* If the parameter declaration is marked as a parameter pack, set
15602 *IS_PARAMETER_PACK to notify the caller. */
15607 {
15608 /* Can happen in some cases of erroneous input (c++/34892). */
15610 /* Consume the `...' for better error recovery. */
15612 }
15614 // The parameter may have been constrained.
15617 parameter_declarator,
15618 is_non_type,
15619 is_parameter_pack);
15621 // Now we're sure that the parameter is a non-type parameter.
15632 }
15634 /* Parse a type-parameter.
15636 type-parameter:
15637 class identifier [opt]
15638 class identifier [opt] = type-id
15639 typename identifier [opt]
15640 typename identifier [opt] = type-id
15641 template < template-parameter-list > class identifier [opt]
15642 template < template-parameter-list > class identifier [opt]
15643 = id-expression
15645 GNU Extension (variadic templates):
15647 type-parameter:
15648 class ... identifier [opt]
15649 typename ... identifier [opt]
15651 Returns a TREE_LIST. The TREE_VALUE is itself a TREE_LIST. The
15652 TREE_PURPOSE is the default-argument, if any. The TREE_VALUE is
15653 the declaration of the parameter.
15655 Sets *IS_PARAMETER_PACK if this is a template parameter pack. */
15657 static tree
15659 {
15661 tree parameter;
15663 /* Look for a keyword to tell us what kind of parameter this is. */
15669 {
15672 {
15673 tree identifier;
15674 tree default_argument;
15676 /* If the next token is an ellipsis, we have a template
15677 argument pack. */
15679 {
15680 /* Consume the `...' token. */
15685 }
15687 /* If the next token is an identifier, then it names the
15688 parameter. */
15691 else
15694 /* Create the parameter. */
15697 /* If the next token is an `=', we have a default argument. */
15699 {
15700 default_argument
15703 /* Template parameter packs cannot have default
15704 arguments. */
15706 {
15709 "template parameter pack %qD cannot have a "
15711 else
15713 "template parameter packs cannot have "
15716 }
15719 }
15720 else
15723 /* Create the combined representation of the parameter and the
15724 default argument. */
15726 }
15730 {
15731 tree identifier;
15732 tree default_argument;
15734 /* Look for the `<'. */
15736 /* Parse the template-parameter-list. */
15738 /* Look for the `>'. */
15741 // If template requirements are present, parse them.
15743 {
15748 }
15750 /* Look for the `class' or 'typename' keywords. */
15752 /* If the next token is an ellipsis, we have a template
15753 argument pack. */
15755 {
15756 /* Consume the `...' token. */
15761 }
15762 /* If the next token is an `=', then there is a
15763 default-argument. If the next token is a `>', we are at
15764 the end of the parameter-list. If the next token is a `,',
15765 then we are at the end of this parameter. */
15769 {
15771 /* Treat invalid names as if the parameter were nameless. */
15774 }
15775 else
15778 /* Create the template parameter. */
15780 identifier);
15782 /* If the next token is an `=', then there is a
15783 default-argument. */
15785 {
15786 default_argument
15789 /* Template parameter packs cannot have default
15790 arguments. */
15792 {
15795 "template parameter pack %qD cannot "
15797 identifier);
15798 else
15802 }
15803 }
15804 else
15807 /* Create the combined representation of the parameter and the
15808 default argument. */
15810 }
15816 }
15819 }
15821 /* Parse a template-id.
15823 template-id:
15824 template-name < template-argument-list [opt] >
15826 If TEMPLATE_KEYWORD_P is TRUE, then we have just seen the
15827 `template' keyword. In this case, a TEMPLATE_ID_EXPR will be
15828 returned. Otherwise, if the template-name names a function, or set
15829 of functions, returns a TEMPLATE_ID_EXPR. If the template-name
15830 names a class, returns a TYPE_DECL for the specialization.
15832 If CHECK_DEPENDENCY_P is FALSE, names are looked up in
15833 uninstantiated templates. */
15835 static tree
15841 {
15842 tree templ;
15843 tree arguments;
15844 tree template_id;
15849 /* If the next token corresponds to a template-id, there is no need
15850 to reparse it. */
15853 {
15856 }
15858 /* Avoid performing name lookup if there is no possibility of
15859 finding a template-id. */
15862 && !cp_parser_nth_token_starts_template_argument_list_p
15864 {
15867 }
15869 /* Remember where the template-id starts. */
15875 /* Parse the template-name. */
15878 check_dependency_p,
15879 is_declaration,
15880 tag_type,
15883 {
15886 }
15888 /* Since we're going to preserve any side-effects from this parse, set up a
15889 firewall to protect our callers from cp_parser_commit_to_tentative_parse
15890 in the template arguments. */
15893 /* If we find the sequence `[:' after a template-name, it's probably
15894 a digraph-typo for `< ::'. Substitute the tokens and check if we can
15895 parse correctly the argument list. */
15902 {
15904 /* Change `:' into `::'. */
15906 /* Consume the first token (CPP_OPEN_SQUARE - which we pretend it is
15907 CPP_LESS. */
15910 /* Parse the arguments. */
15913 {
15914 /* If we couldn't parse an argument list, then we revert our changes
15915 and return simply an error. Maybe this is not a template-id
15916 after all. */
15921 }
15922 /* Otherwise, emit an error about the invalid digraph, but continue
15923 parsing because we got our argument list. */
15926 {
15929 "%<<:%> is an alternate spelling for %<[%>."
15932 {
15934 "or %<-std=c++11%>, or %<-std=gnu++11%> G++ will "
15937 }
15938 }
15939 }
15940 else
15941 {
15942 /* Look for the `<' that starts the template-argument-list. */
15944 {
15947 }
15948 /* Parse the arguments. */
15950 }
15952 /* Set the location to be of the form:
15953 template-name < template-argument-list [opt] >
15954 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
15955 with caret == start at the start of the template-name,
15956 ranging until the closing '>'. */
15957 location_t finish_loc
15959 location_t combined_loc
15962 /* Check for concepts autos where they don't belong. We could
15963 identify types in some cases of idnetifier TEMPL, looking ahead
15964 for a CPP_SCOPE, but that would buy us nothing: we accept auto in
15965 types. We reject them in functions, but if what we have is an
15966 identifier, even with none_type we can't conclude it's NOT a
15967 type, we have to wait for template substitution. */
15970 /* Build a representation of the specialization. */
15973 TEMPLATE_ID_EXPR,
15977 {
15978 /* In "template <typename T> ... A<T>::", A<T> is the abstract A
15979 template (rather than some instantiation thereof) only if
15980 is not nested within some other construct. For example, in
15981 "template <typename T> void f(T) { A<T>::", A<T> is just an
15982 instantiation of A. */
15983 bool entering_scope
15986 template_id
15988 }
15989 /* A template-like identifier may be a partial concept id. */
15995 {
15999 }
16000 else
16001 {
16002 /* If it's not a class-template or a template-template, it should be
16003 a function-template. */
16011 }
16013 /* If parsing tentatively, replace the sequence of tokens that makes
16014 up the template-id with a CPP_TEMPLATE_ID token. That way,
16015 should we re-parse the token stream, we will not have to repeat
16016 the effort required to do the parse, nor will we issue duplicate
16017 error messages about problems during instantiation of the
16018 template. */
16020 /* Don't do this if we had a parse error in a declarator; re-parsing
16021 might succeed if a name changes meaning (60361). */
16025 {
16026 /* Reset the contents of the START_OF_ID token. */
16030 /* Retrieve any deferred checks. Do not pop this access checks yet
16031 so the memory will not be reclaimed during token replacing below. */
16037 /* Purge all subsequent tokens. */
16040 /* ??? Can we actually assume that, if template_id ==
16041 error_mark_node, we will have issued a diagnostic to the
16042 user, as opposed to simply marking the tentative parse as
16043 failed? */
16046 }
16050 }
16052 /* Parse a template-name.
16054 template-name:
16055 identifier
16057 The standard should actually say:
16059 template-name:
16060 identifier
16061 operator-function-id
16063 A defect report has been filed about this issue.
16065 A conversion-function-id cannot be a template name because they cannot
16066 be part of a template-id. In fact, looking at this code:
16068 a.operator K<int>()
16070 the conversion-function-id is "operator K<int>", and K<int> is a type-id.
16071 It is impossible to call a templated conversion-function-id with an
16072 explicit argument list, since the only allowed template parameter is
16073 the type to which it is converting.
16075 If TEMPLATE_KEYWORD_P is true, then we have just seen the
16076 `template' keyword, in a construction like:
16078 T::template f<3>()
16080 In that case `f' is taken to be a template-name, even though there
16081 is no way of knowing for sure.
16083 Returns the TEMPLATE_DECL for the template, or an OVERLOAD if the
16084 name refers to a set of overloaded functions, at least one of which
16085 is a template, or an IDENTIFIER_NODE with the name of the template,
16086 if TEMPLATE_KEYWORD_P is true. If CHECK_DEPENDENCY_P is FALSE,
16087 names are looked up inside uninstantiated templates. */
16089 static tree
16096 {
16097 tree identifier;
16098 tree decl;
16101 /* If the next token is `operator', then we have either an
16102 operator-function-id or a conversion-function-id. */
16104 {
16105 /* We don't know whether we're looking at an
16106 operator-function-id or a conversion-function-id. */
16108 /* Try an operator-function-id. */
16110 /* If that didn't work, try a conversion-function-id. */
16112 {
16115 }
16116 }
16117 /* Look for the identifier. */
16118 else
16121 /* If we didn't find an identifier, we don't have a template-id. */
16125 /* If the name immediately followed the `template' keyword, then it
16126 is a template-name. However, if the next token is not `<', then
16127 we do not treat it as a template-name, since it is not being used
16128 as part of a template-id. This enables us to handle constructs
16129 like:
16131 template <typename T> struct S { S(); };
16132 template <typename T> S<T>::S();
16134 correctly. We would treat `S' as a template -- if it were `S<T>'
16135 -- but we do not if there is no `<'. */
16139 {
16140 /* In a declaration, in a dependent context, we pretend that the
16141 "template" keyword was present in order to improve error
16142 recovery. For example, given:
16144 template <typename T> void f(T::X<int>);
16146 we want to treat "X<int>" as a template-id. */
16148 && !template_keyword_p
16150 && check_dependency_p
16152 /* Do not do this for dtors (or ctors), since they never
16153 need the template keyword before their name. */
16155 {
16158 /* Explain what went wrong. */
16160 identifier);
16163 /* If parsing tentatively, find the location of the "<" token. */
16166 /* Parse the template arguments so that we can issue error
16167 messages about them. */
16170 /* Skip tokens until we find a good place from which to
16171 continue parsing. */
16176 /* If parsing tentatively, permanently remove the
16177 template argument list. That will prevent duplicate
16178 error messages from being issued about the missing
16179 "template" keyword. */
16186 }
16188 /* If the "template" keyword is present, then there is generally
16189 no point in doing name-lookup, so we just return IDENTIFIER.
16190 But, if the qualifying scope is non-dependent then we can
16191 (and must) do name-lookup normally. */
16193 {
16199 {
16200 /* We're optimizing away the call to cp_parser_lookup_name, but
16201 we still need to do this. */
16204 }
16205 }
16206 }
16208 /* Look up the name. */
16210 tag_type,
16213 check_dependency_p,
16219 /* If DECL is a template, then the name was a template-name. */
16221 {
16225 }
16226 else
16227 {
16228 /* The standard does not explicitly indicate whether a name that
16229 names a set of overloaded declarations, some of which are
16230 templates, is a template-name. However, such a name should
16231 be a template-name; otherwise, there is no way to form a
16232 template-id for the overloaded templates. */
16241 {
16242 /* The name does not name a template. */
16245 }
16246 }
16248 /* If DECL is dependent, and refers to a function, then just return
16249 its name; we will look it up again during template instantiation. */
16251 {
16255 }
16258 }
16260 /* Parse a template-argument-list.
16262 template-argument-list:
16263 template-argument ... [opt]
16264 template-argument-list , template-argument ... [opt]
16266 Returns a TREE_VEC containing the arguments. */
16268 static tree
16270 {
16275 tree vec;
16282 /* Even if the template-id appears in an integral
16283 constant-expression, the contents of the argument list do
16284 not. */
16290 /* Parse the arguments. */
16291 do
16292 {
16293 tree argument;
16296 /* Consume the comma. */
16299 /* Parse the template-argument. */
16302 /* If the next token is an ellipsis, we're expanding a template
16303 argument pack. */
16305 {
16307 {
16311 }
16312 /* Consume the `...' token. */
16315 /* Make the argument into a TYPE_PACK_EXPANSION or
16316 EXPR_PACK_EXPANSION. */
16318 }
16321 {
16325 {
16328 }
16329 else
16331 }
16333 }
16349 }
16351 /* Parse a template-argument.
16353 template-argument:
16354 assignment-expression
16355 type-id
16356 id-expression
16358 The representation is that of an assignment-expression, type-id, or
16359 id-expression -- except that the qualified id-expression is
16360 evaluated, so that the value returned is either a DECL or an
16361 OVERLOAD.
16363 Although the standard says "assignment-expression", it forbids
16364 throw-expressions or assignments in the template argument.
16365 Therefore, we use "conditional-expression" instead. */
16367 static tree
16369 {
16370 tree argument;
16376 cp_id_kind idk;
16378 /* There's really no way to know what we're looking at, so we just
16379 try each alternative in order.
16381 [temp.arg]
16383 In a template-argument, an ambiguity between a type-id and an
16384 expression is resolved to a type-id, regardless of the form of
16385 the corresponding template-parameter.
16387 Therefore, we try a type-id first. */
16390 /* If there was no error parsing the type-id but the next token is a
16391 '>>', our behavior depends on which dialect of C++ we're
16392 parsing. In C++98, we probably found a typo for '> >'. But there
16393 are type-id which are also valid expressions. For instance:
16395 struct X { int operator >> (int); };
16396 template <int V> struct Foo {};
16397 Foo<X () >> 5> r;
16399 Here 'X()' is a valid type-id of a function type, but the user just
16400 wanted to write the expression "X() >> 5". Thus, we remember that we
16401 found a valid type-id, but we still try to parse the argument as an
16402 expression to see what happens.
16404 In C++0x, the '>>' will be considered two separate '>'
16405 tokens. */
16409 {
16412 }
16413 else
16414 {
16415 /* If the next token isn't a `,' or a `>', then this argument wasn't
16416 really finished. This means that the argument is not a valid
16417 type-id. */
16420 /* If that worked, we're done. */
16423 }
16424 /* We're still not sure what the argument will be. */
16426 /* Try a template. */
16434 /* If the next token isn't a `,' or a `>', then this argument wasn't
16435 really finished. */
16439 {
16440 /* Figure out what is being referred to. If the id-expression
16441 was for a class template specialization, then we will have a
16442 TYPE_DECL at this point. There is no need to do name lookup
16443 at this point in that case. */
16446 none_type,
16452 /* Handle a constrained-type-specifier for a non-type template
16453 parameter. */
16459 }
16461 {
16465 }
16466 /* It must be a non-type argument. In C++17 any constant-expression is
16467 allowed. */
16471 /* Otherwise, the permitted cases are given in [temp.arg.nontype]:
16473 -- an integral constant-expression of integral or enumeration
16474 type; or
16476 -- the name of a non-type template-parameter; or
16478 -- the name of an object or function with external linkage...
16480 -- the address of an object or function with external linkage...
16482 -- a pointer to member... */
16483 /* Look for a non-type template parameter. */
16485 {
16497 }
16499 /* If the next token is "&", the argument must be the address of an
16500 object or function with external linkage. */
16503 {
16506 }
16507 /* See if we might have an id-expression. */
16514 {
16517 address_p,
16524 else
16525 {
16526 tree probe;
16529 {
16530 /* Strip the dereference temporarily. */
16533 }
16535 /* If we're in a template, we represent a qualified-id referring
16536 to a static data member as a SCOPE_REF even if the scope isn't
16537 dependent so that we can check access control later. */
16542 {
16543 /* A variable without external linkage might still be a
16544 valid constant-expression, so no error is issued here
16545 if the external-linkage check fails. */
16548 }
16550 /* All overloaded functions are allowed; if the external
16551 linkage test does not pass, an error will be issued
16552 later. */
16553 ;
16557 /* A pointer-to-member. */
16558 ;
16560 ;
16561 else
16565 {
16568 tf_warning_or_error);
16569 else
16572 }
16573 }
16574 }
16575 /* If the argument started with "&", there are no other valid
16576 alternatives at this point. */
16578 {
16581 }
16583 general_expr:
16584 /* If the argument wasn't successfully parsed as a type-id followed
16585 by '>>', the argument can only be a constant expression now.
16586 Otherwise, we try parsing the constant-expression tentatively,
16587 because the argument could really be a type-id. */
16593 else
16594 {
16595 /* With C++17 generalized non-type template arguments we need to handle
16596 lvalue constant expressions, too. */
16599 }
16607 /* We did our best to parse the argument as a non type-id, but that
16608 was the only alternative that matched (albeit with a '>' after
16609 it). We can assume it's just a typo from the user, and a
16610 diagnostic will then be issued. */
16612 }
16614 /* Parse an explicit-instantiation.
16616 explicit-instantiation:
16617 template declaration
16619 Although the standard says `declaration', what it really means is:
16621 explicit-instantiation:
16622 template decl-specifier-seq [opt] declarator [opt] ;
16624 Things like `template int S<int>::i = 5, int S<double>::j;' are not
16625 supposed to be allowed. A defect report has been filed about this
16626 issue.
16628 GNU Extension:
16630 explicit-instantiation:
16631 storage-class-specifier template
16632 decl-specifier-seq [opt] declarator [opt] ;
16633 function-specifier template
16634 decl-specifier-seq [opt] declarator [opt] ; */
16636 static void
16638 {
16640 cp_decl_specifier_seq decl_specifiers;
16645 /* Look for an (optional) storage-class-specifier or
16646 function-specifier. */
16648 {
16649 extension_specifier
16652 extension_specifier
16655 }
16657 /* Look for the `template' keyword. */
16659 /* Let the front end know that we are processing an explicit
16660 instantiation. */
16662 /* [temp.explicit] says that we are supposed to ignore access
16663 control while processing explicit instantiation directives. */
16665 /* Parse a decl-specifier-seq. */
16667 CP_PARSER_FLAGS_OPTIONAL,
16670 /* If there was exactly one decl-specifier, and it declared a class,
16671 and there's no declarator, then we have an explicit type
16672 instantiation. */
16674 {
16675 tree type;
16679 /* Turn access control back on for names used during
16680 template instantiation. */
16685 }
16686 else
16687 {
16689 tree decl;
16691 /* Parse the declarator. */
16692 declarator
16703 {
16706 "explicit instantiation shall not use"
16710 "explicit instantiation shall not use"
16715 /* Turn access control back on for names used during
16716 template instantiation. */
16718 /* Do the explicit instantiation. */
16720 }
16721 else
16722 {
16724 /* Skip the body of the explicit instantiation. */
16726 }
16727 }
16728 /* We're done with the instantiation. */
16734 }
16736 /* Parse an explicit-specialization.
16738 explicit-specialization:
16739 template < > declaration
16741 Although the standard says `declaration', what it really means is:
16743 explicit-specialization:
16744 template <> decl-specifier [opt] init-declarator [opt] ;
16745 template <> function-definition
16746 template <> explicit-specialization
16747 template <> template-declaration */
16749 static void
16751 {
16755 /* Look for the `template' keyword. */
16757 /* Look for the `<'. */
16759 /* Look for the `>'. */
16761 /* We have processed another parameter list. */
16763 /* [temp]
16765 A template ... explicit specialization ... shall not have C
16766 linkage. */
16768 {
16771 /* Give it C++ linkage to avoid confusing other parts of the
16772 front end. */
16775 }
16776 else
16778 /* Let the front end know that we are beginning a specialization. */
16780 {
16783 }
16785 /* If the next keyword is `template', we need to figure out whether
16786 or not we're looking a template-declaration. */
16788 {
16793 else
16795 }
16796 else
16797 /* Parse the dependent declaration. */
16803 /* We're done with the specialization. */
16805 /* For the erroneous case of a template with C linkage, we pushed an
16806 implicit C++ linkage scope; exit that scope now. */
16809 /* We're done with this parameter list. */
16811 }
16813 /* Parse a type-specifier.
16815 type-specifier:
16816 simple-type-specifier
16817 class-specifier
16818 enum-specifier
16819 elaborated-type-specifier
16820 cv-qualifier
16822 GNU Extension:
16824 type-specifier:
16825 __complex__
16827 Returns a representation of the type-specifier. For a
16828 class-specifier, enum-specifier, or elaborated-type-specifier, a
16829 TREE_TYPE is returned; otherwise, a TYPE_DECL is returned.
16831 The parser flags FLAGS is used to control type-specifier parsing.
16833 If IS_DECLARATION is TRUE, then this type-specifier is appearing
16834 in a decl-specifier-seq.
16836 If DECLARES_CLASS_OR_ENUM is non-NULL, and the type-specifier is a
16837 class-specifier, enum-specifier, or elaborated-type-specifier, then
16838 *DECLARES_CLASS_OR_ENUM is set to a nonzero value. The value is 1
16839 if a type is declared; 2 if it is defined. Otherwise, it is set to
16840 zero.
16842 If IS_CV_QUALIFIER is non-NULL, and the type-specifier is a
16843 cv-qualifier, then IS_CV_QUALIFIER is set to TRUE. Otherwise, it
16844 is set to FALSE. */
16846 static tree
16848 cp_parser_flags flags,
16853 {
16859 /* Assume this type-specifier does not declare a new type. */
16862 /* And that it does not specify a cv-qualifier. */
16865 /* Peek at the next token. */
16868 /* If we're looking at a keyword, we can use that to guide the
16869 production we choose. */
16872 {
16877 /* Look for the enum-specifier. */
16879 /* If that worked, we're done. */
16881 {
16886 type_spec,
16887 token,
16890 }
16891 else
16894 /* Any of these indicate either a class-specifier, or an
16895 elaborated-type-specifier. */
16902 /* Parse tentatively so that we can back up if we don't find a
16903 class-specifier. */
16905 /* Look for the class-specifier. */
16908 /* If that worked, we're done. */
16910 {
16915 type_spec,
16916 token,
16919 }
16921 /* Fall through. */
16922 elaborated_type_specifier:
16923 /* We're declaring (not defining) a class or enum. */
16927 /* Fall through. */
16929 /* Look for an elaborated-type-specifier. */
16930 type_spec
16931 = (cp_parser_elaborated_type_specifier
16934 is_declaration));
16937 type_spec,
16938 token,
16961 /* The `__complex__' keyword is a GNU extension. */
16967 }
16969 /* Handle simple keywords. */
16971 {
16973 {
16976 }
16978 }
16980 /* If we do not already have a type-specifier, assume we are looking
16981 at a simple-type-specifier. */
16983 decl_specs,
16984 flags);
16986 /* If we didn't find a type-specifier, and a type-specifier was not
16987 optional in this context, issue an error message. */
16989 {
16992 }
16995 }
16997 /* Parse a simple-type-specifier.
16999 simple-type-specifier:
17000 :: [opt] nested-name-specifier [opt] type-name
17001 :: [opt] nested-name-specifier template template-id
17002 char
17003 wchar_t
17004 bool
17005 short
17006 int
17007 long
17008 signed
17009 unsigned
17010 float
17011 double
17012 void
17014 C++11 Extension:
17016 simple-type-specifier:
17017 auto
17018 decltype ( expression )
17019 char16_t
17020 char32_t
17021 __underlying_type ( type-id )
17023 C++17 extension:
17025 nested-name-specifier(opt) template-name
17027 GNU Extension:
17029 simple-type-specifier:
17030 __int128
17031 __typeof__ unary-expression
17032 __typeof__ ( type-id )
17033 __typeof__ ( type-id ) { initializer-list , [opt] }
17035 Concepts Extension:
17037 simple-type-specifier:
17038 constrained-type-specifier
17040 Returns the indicated TYPE_DECL. If DECL_SPECS is not NULL, it is
17041 appropriately updated. */
17043 static tree
17046 cp_parser_flags flags)
17047 {
17052 /* Peek at the next token. */
17055 /* If we're looking at a keyword, things are easy. */
17057 {
17092 {
17095 }
17124 {
17125 /* The 'auto' might be the placeholder return type for a function decl
17126 with trailing return type. */
17135 {
17137 {
17144 }
17147 {
17150 }
17153 }
17157 {
17160 }
17163 {
17166 }
17167 else
17171 {
17174 "use of %<auto%> in lambda parameter declaration "
17175 "only available with "
17177 }
17180 "use of %<auto%> in parameter declaration "
17181 "only available with "
17185 "use of %<auto%> in parameter declaration "
17187 }
17188 else
17193 /* Since DR 743, decltype can either be a simple-type-specifier by
17194 itself or begin a nested-name-specifier. Parsing it will replace
17195 it with a CPP_DECLTYPE, so just rewind and let the CPP_DECLTYPE
17196 handling below decide what to do. */
17202 /* Consume the `typeof' token. */
17204 /* Parse the operand to `typeof'. */
17206 /* If it is not already a TYPE, take its type. */
17212 token,
17221 token,
17231 token,
17236 }
17238 /* If token is an already-parsed decltype not followed by ::,
17239 it's a simple-type-specifier. */
17242 {
17245 {
17247 token,
17249 /* Remember that we are handling a decltype in order to
17250 implement the resolution of DR 1510 when the argument
17251 isn't instantiation dependent. */
17253 }
17256 }
17258 /* If the type-specifier was for a built-in type, we're done. */
17260 {
17261 /* Record the type. */
17268 type,
17269 token,
17274 /* Consume the token. */
17280 /* There is no valid C++ program where a non-template type is
17281 followed by a "<". That usually indicates that the user thought
17282 that the type was a template. */
17287 }
17289 /* The type-specifier must be a user-defined type. */
17291 {
17295 /* Don't gobble tokens or issue error messages if this is an
17296 optional type-specifier. */
17302 /* Look for the optional `::' operator. */
17303 global_p
17307 /* Look for the nested-name specifier. */
17308 qualified_p
17315 /* If we have seen a nested-name-specifier, and the next token
17316 is `template', then we are using the template-id production. */
17319 {
17320 /* Look for the template-id. */
17324 none_type,
17326 /* If the template-id did not name a type, we are out of
17327 luck. */
17329 {
17332 }
17333 }
17334 /* Otherwise, look for a type-name. */
17335 else
17337 /* Keep track of all name-lookups performed in class scopes. */
17339 && !global_p
17340 && !qualified_p
17344 /* If it didn't work out, we don't have a TYPE. */
17349 {
17363 {
17365 none_type,
17375 else
17376 {
17381 }
17382 }
17383 else
17389 }
17392 token,
17394 }
17396 /* If we didn't get a type-name, issue an error message. */
17398 {
17401 }
17404 {
17405 /* See if TYPE is an Objective-C type, and if so, parse and
17406 accept any protocol references following it. Do this before
17407 the cp_parser_check_for_invalid_template_id() call, because
17408 Objective-C types can be followed by '<...>' which would
17409 enclose protocol names rather than template arguments, and so
17410 everything is fine. */
17413 {
17417 /* Clobber the "unqualified" type previously entered into
17418 DECL_SPECS with the new, improved protocol-qualified version. */
17423 }
17425 /* There is no valid C++ program where a non-template type is
17426 followed by a "<". That usually indicates that the user
17427 thought that the type was a template. */
17429 none_type,
17431 }
17434 }
17436 /* Parse a type-name.
17438 type-name:
17439 class-name
17440 enum-name
17441 typedef-name
17442 simple-template-id [in c++0x]
17444 enum-name:
17445 identifier
17447 typedef-name:
17448 identifier
17450 Concepts:
17452 type-name:
17453 concept-name
17454 partial-concept-id
17456 concept-name:
17457 identifier
17459 Returns a TYPE_DECL for the type. */
17461 static tree
17463 {
17465 }
17467 /* See above. */
17468 static tree
17470 {
17471 tree type_decl;
17473 /* We can't know yet whether it is a class-name or not. */
17475 /* Try a class-name. */
17477 typename_keyword_p,
17479 none_type,
17483 /* If it's not a class-name, keep looking. */
17485 {
17487 /* It must be a typedef-name or an enum-name. */
17491 /* It is either a simple-template-id representing an
17492 instantiation of an alias template... */
17496 none_type,
17498 /* Note that this must be an instantiation of an alias template
17499 because [temp.names]/6 says:
17501 A template-id that names an alias template specialization
17502 is a type-name.
17504 Whereas [temp.names]/7 says:
17506 A simple-template-id that names a class template
17507 specialization is a class-name.
17509 With concepts, this could also be a partial-concept-id that
17510 declares a non-type template parameter. */
17517 else
17521 /* ... Or a typedef-name or an enum-name. */
17523 }
17526 }
17528 /* Check if DECL and ARGS can form a constrained-type-specifier.
17529 If ARGS is non-null, we try to form a concept check of the
17530 form DECL<?, ARGS> where ? is a wildcard that matches any
17531 kind of template argument. If ARGS is NULL, then we try to
17532 form a concept check of the form DECL<?>. */
17534 static tree
17537 {
17540 /* If we a constrained-type-specifier cannot be deduced. */
17544 /* A constrained type specifier can only be found in an
17545 overload set or as a reference to a template declaration.
17547 FIXME: This might be masking a bug. It's possible that
17548 that the deduction below is causing template specializations
17549 to be formed with the wildcard as an argument. */
17553 /* Try to build a call expression that evaluates the
17554 concept. This can fail if the overload set refers
17555 only to non-templates. */
17561 /* Deduce the checked constraint and the prototype parameter.
17563 FIXME: In certain cases, failure to deduce should be a
17564 diagnosable error. */
17565 tree conc;
17566 tree proto;
17570 /* In template parameter scope, this results in a constrained
17571 parameter. Return a descriptor of that parm. */
17575 /* In a parameter-declaration-clause, constrained-type
17576 specifiers result in invented template parameters. */
17578 {
17581 }
17582 else
17583 {
17584 /* Otherwise, we're in a context where the constrained
17585 type name is deduced and the constraint applies
17586 after deduction. */
17588 }
17591 }
17593 /* If DECL refers to a concept, return a TYPE_DECL representing
17594 the result of using the constrained type specifier in the
17595 current context. DECL refers to a concept if
17597 - it is an overload set containing a function concept taking a single
17598 type argument, or
17600 - it is a variable concept taking a single type argument. */
17602 static tree
17604 {
17610 else
17612 }
17614 /* Check if DECL and ARGS form a partial-concept-id. If so,
17615 assign ID to the resulting constrained placeholder.
17617 Returns true if the partial-concept-id designates a placeholder
17618 and false otherwise. Note that *id is set to NULL_TREE in
17619 this case. */
17621 static tree
17623 {
17625 }
17627 /* Parse a non-class type-name, that is, either an enum-name, a typedef-name,
17628 or a concept-name.
17630 enum-name:
17631 identifier
17633 typedef-name:
17634 identifier
17636 concept-name:
17637 identifier
17639 Returns a TYPE_DECL for the type. */
17641 static tree
17643 {
17644 tree type_decl;
17645 tree identifier;
17652 /* Look up the type-name. */
17657 /* If we found an overload set, then it may refer to a concept-name. */
17663 {
17664 /* See if this is an Objective-C type. */
17669 }
17671 /* Issue an error if we did not find a type-name. */
17673 /* In Objective-C, we have the complication that class names are
17674 normally type names and start declarations (eg, the
17675 "NSObject" in "NSObject *object;"), but can be used in an
17676 Objective-C 2.0 dot-syntax (as in "NSObject.version") which
17677 is an expression. So, a classname followed by a dot is not a
17678 valid type-name. */
17681 {
17686 }
17687 /* Remember that the name was used in the definition of the
17688 current class so that we can check later to see if the
17689 meaning would have been different after the class was
17690 entirely defined. */
17696 }
17698 /* Parse an elaborated-type-specifier. Note that the grammar given
17699 here incorporates the resolution to DR68.
17701 elaborated-type-specifier:
17702 class-key :: [opt] nested-name-specifier [opt] identifier
17703 class-key :: [opt] nested-name-specifier [opt] template [opt] template-id
17704 enum-key :: [opt] nested-name-specifier [opt] identifier
17705 typename :: [opt] nested-name-specifier identifier
17706 typename :: [opt] nested-name-specifier template [opt]
17707 template-id
17709 GNU extension:
17711 elaborated-type-specifier:
17712 class-key attributes :: [opt] nested-name-specifier [opt] identifier
17713 class-key attributes :: [opt] nested-name-specifier [opt]
17714 template [opt] template-id
17715 enum attributes :: [opt] nested-name-specifier [opt] identifier
17717 If IS_FRIEND is TRUE, then this elaborated-type-specifier is being
17718 declared `friend'. If IS_DECLARATION is TRUE, then this
17719 elaborated-type-specifier appears in a decl-specifiers-seq, i.e.,
17720 something is being declared.
17722 Returns the TYPE specified. */
17724 static tree
17728 {
17730 tree identifier;
17733 tree globalscope;
17736 /* See if we're looking at the `enum' keyword. */
17738 {
17739 /* Consume the `enum' token. */
17741 /* Remember that it's an enumeration type. */
17743 /* Issue a warning if the `struct' or `class' key (for C++0x scoped
17744 enums) is used here. */
17748 {
17755 /* Consume the `struct' or `class' and parse it anyway. */
17757 }
17758 /* Parse the attributes. */
17760 }
17761 /* Or, it might be `typename'. */
17763 RID_TYPENAME))
17764 {
17765 /* Consume the `typename' token. */
17767 /* Remember that it's a `typename' type. */
17769 }
17770 /* Otherwise it must be a class-key. */
17771 else
17772 {
17776 /* Parse the attributes. */
17778 }
17780 /* Look for the `::' operator. */
17783 /* Look for the nested-name-specifier. */
17784 tree nested_name_specifier;
17786 {
17787 nested_name_specifier
17792 is_declaration);
17795 }
17796 else
17797 /* Even though `typename' is not present, the proposed resolution
17798 to Core Issue 180 says that in `class A<T>::B', `B' should be
17799 considered a type-name, even if `A<T>' is dependent. */
17800 nested_name_specifier
17805 is_declaration);
17806 /* For everything but enumeration types, consider a template-id.
17807 For an enumeration type, consider only a plain identifier. */
17809 {
17811 tree decl;
17813 /* Allow the `template' keyword. */
17815 /* If we didn't see `template', we don't know if there's a
17816 template-id or not. */
17819 /* Parse the template-id. */
17823 tag_type,
17824 is_declaration);
17825 /* If we didn't find a template-id, look for an ordinary
17826 identifier. */
17828 ;
17829 /* We can get here when cp_parser_template_id, called by
17830 cp_parser_class_name with tag_type == none_type, succeeds
17831 and caches a BASELINK. Then, when called again here,
17832 instead of failing and returning an error_mark_node
17833 returns it (see template/typename17.C in C++11).
17834 ??? Could we diagnose this earlier? */
17836 {
17839 }
17840 /* If DECL is a TEMPLATE_ID_EXPR, and the `typename' keyword is
17841 in effect, then we must assume that, upon instantiation, the
17842 template will correspond to a class. */
17846 typename_type,
17848 /* If the `typename' keyword is in effect and DECL is not a type
17849 decl, then type is non existent. */
17851 ;
17853 {
17857 /* If the next token is a semicolon, this must be a specialization,
17858 instantiation, or friend declaration. Check the scope while we
17859 still know whether or not we had a nested-name-specifier. */
17864 }
17867 }
17870 {
17875 {
17878 }
17880 /* For a `typename', we needn't call xref_tag. */
17886 /* Template parameter lists apply only if we are not within a
17887 function parameter list. */
17888 bool template_parm_lists_apply
17897 /* Look up a qualified name in the usual way. */
17899 {
17900 tree decl;
17901 tree ambiguous_decls;
17904 tag_type,
17911 /* If the lookup was ambiguous, an error will already have been
17912 issued. */
17916 /* If we are parsing friend declaration, DECL may be a
17917 TEMPLATE_DECL tree node here. However, we need to check
17918 whether this TEMPLATE_DECL results in valid code. Consider
17919 the following example:
17921 namespace N {
17922 template <class T> class C {};
17923 }
17924 class X {
17925 template <class T> friend class N::C; // #1, valid code
17926 };
17927 template <class T> class Y {
17928 friend class N::C; // #2, invalid code
17929 };
17931 For both case #1 and #2, we arrive at a TEMPLATE_DECL after
17932 name lookup of `N::C'. We see that friend declaration must
17933 be template for the code to be valid. Note that
17934 processing_template_decl does not work here since it is
17935 always 1 for the above two cases. */
17937 decl = (cp_parser_maybe_treat_template_as_class
17942 {
17944 identifier,
17947 }
17950 {
17954 allow_template);
17958 }
17960 /* Forward declarations of nested types, such as
17962 class C1::C2;
17963 class C1::C2::C3;
17965 are invalid unless all components preceding the final '::'
17966 are complete. If all enclosing types are complete, these
17967 declarations become merely pointless.
17969 Invalid forward declarations of nested types are errors
17970 caught elsewhere in parsing. Those that are pointless arrive
17971 here. */
17978 }
17979 else
17980 {
17981 /* An elaborated-type-specifier sometimes introduces a new type and
17982 sometimes names an existing type. Normally, the rule is that it
17983 introduces a new type only if there is not an existing type of
17984 the same name already in scope. For example, given:
17986 struct S {};
17987 void f() { struct S s; }
17989 the `struct S' in the body of `f' is the same `struct S' as in
17990 the global scope; the existing definition is used. However, if
17991 there were no global declaration, this would introduce a new
17992 local class named `S'.
17994 An exception to this rule applies to the following code:
17996 namespace N { struct S; }
17998 Here, the elaborated-type-specifier names a new type
17999 unconditionally; even if there is already an `S' in the
18000 containing scope this declaration names a new type.
18001 This exception only applies if the elaborated-type-specifier
18002 forms the complete declaration:
18004 [class.name]
18006 A declaration consisting solely of `class-key identifier ;' is
18007 either a redeclaration of the name in the current scope or a
18008 forward declaration of the identifier as a class name. It
18009 introduces the name into the current scope.
18011 We are in this situation precisely when the next token is a `;'.
18013 An exception to the exception is that a `friend' declaration does
18014 *not* name a new type; i.e., given:
18016 struct S { friend struct T; };
18018 `T' is not a new type in the scope of `S'.
18020 Also, `new struct S' or `sizeof (struct S)' never results in the
18021 definition of a new type; a new type can only be declared in a
18022 declaration context. */
18024 tag_scope ts;
18028 /* Friends have special name lookup rules. */
18032 CPP_SEMICOLON))
18033 /* This is a `class-key identifier ;' */
18035 else
18038 template_p =
18039 (template_parm_lists_apply
18042 /* An unqualified name was used to reference this type, so
18043 there were no qualifying templates. */
18052 }
18053 }
18058 /* Allow attributes on forward declarations of classes. */
18060 {
18070 else
18073 }
18076 {
18077 /* Indicate whether this class was declared as a `class' or as a
18078 `struct'. */
18082 }
18084 /* A "<" cannot follow an elaborated type specifier. If that
18085 happens, the user was probably trying to form a template-id. */
18090 }
18092 /* Parse an enum-specifier.
18094 enum-specifier:
18095 enum-head { enumerator-list [opt] }
18096 enum-head { enumerator-list , } [C++0x]
18098 enum-head:
18099 enum-key identifier [opt] enum-base [opt]
18100 enum-key nested-name-specifier identifier enum-base [opt]
18102 enum-key:
18103 enum
18104 enum class [C++0x]
18105 enum struct [C++0x]
18107 enum-base: [C++0x]
18108 : type-specifier-seq
18110 opaque-enum-specifier:
18111 enum-key identifier enum-base [opt] ;
18113 GNU Extensions:
18114 enum-key attributes[opt] identifier [opt] enum-base [opt]
18115 { enumerator-list [opt] }attributes[opt]
18116 enum-key attributes[opt] identifier [opt] enum-base [opt]
18117 { enumerator-list, }attributes[opt] [C++0x]
18119 Returns an ENUM_TYPE representing the enumeration, or NULL_TREE
18120 if the token stream isn't an enum-specifier after all. */
18122 static tree
18124 {
18125 tree identifier;
18127 tree prev_scope;
18129 tree attributes;
18142 /* Parse tentatively so that we can back up if we don't find a
18143 enum-specifier. */
18146 /* Caller guarantees that the current token is 'enum', an identifier
18147 possibly follows, and the token after that is an opening brace.
18148 If we don't have an identifier, fabricate an anonymous name for
18149 the enumeration being defined. */
18152 /* Parse the "class" or "struct", which indicates a scoped
18153 enumeration type in C++0x. */
18156 {
18160 /* Consume the `struct' or `class' token. */
18164 }
18168 /* Clear the qualification. */
18173 /* Figure out in what scope the declaration is being placed. */
18179 nested_name_specifier
18187 {
18188 tree name;
18192 enum_type,
18197 input_location);
18199 {
18202 {
18203 /* Are template enums allowed in ISO? */
18207 /* ignore a typename reference, for it will be solved by name
18208 in start_enum. */
18210 }
18211 }
18214 else
18215 {
18220 }
18221 }
18222 else
18223 {
18226 else
18227 {
18233 }
18234 }
18237 /* Check for the `:' that denotes a specified underlying type in C++0x.
18238 Note that a ':' could also indicate a bitfield width, however. */
18240 {
18241 cp_decl_specifier_seq type_specifiers;
18243 /* Consume the `:'. */
18246 /* Parse the type-specifier-seq. */
18251 /* At this point this is surely not elaborated type specifier. */
18260 /* If that didn't work, stop. */
18262 {
18268 }
18269 }
18271 /* Look for the `{' but don't consume it yet. */
18273 {
18275 {
18278 {
18281 }
18282 }
18283 /* An opaque-enum-specifier must have a ';' here. */
18286 {
18289 {
18292 }
18293 }
18294 }
18300 {
18302 {
18306 }
18308 {
18310 }
18311 }
18313 /* Issue an error message if type-definitions are forbidden here. */
18316 else
18317 /* Create the new type. We do this before consuming the opening
18318 brace so the enum will be recorded as being on the line of its
18319 tag (or the 'enum' keyword, if there is no tag). */
18323 /* If the next token is not '{' it is an opaque-enum-specifier or an
18324 elaborated-type-specifier. */
18326 {
18330 {
18331 /* The following catches invalid code such as:
18332 enum class S<int>::E { A, B, C }; */
18340 {
18344 nested_name_specifier);
18346 }
18349 {
18351 "%qT for enum declaration does not name a class "
18354 }
18355 /* If that scope does not contain the scope in which the
18356 class was originally declared, the program is invalid. */
18358 nested_name_specifier))
18359 {
18362 "declaration of %qD in namespace %qD which does not "
18365 else
18367 "declaration of %qD in %qD which does not "
18371 }
18372 /* If that scope is the scope where the declaration is being placed
18373 the program is invalid. */
18377 {
18381 }
18382 }
18387 /* Consume the opening brace. */
18388 matching_braces braces;
18395 {
18399 }
18400 else
18401 {
18407 }
18411 /* If the next token is not '}', then there are some enumerators. */
18413 {
18417 }
18418 else
18421 /* Consume the final '}'. */
18427 }
18428 else
18429 {
18430 /* If a ';' follows, then it is an opaque-enum-specifier
18431 and additional restrictions apply. */
18433 {
18440 }
18441 }
18443 /* Look for trailing attributes to apply to this enumeration, and
18444 apply them if appropriate. */
18446 {
18449 trailing_attr,
18451 }
18453 /* Finish up the enumeration. */
18455 {
18460 }
18463 {
18465 {
18468 }
18470 {
18472 }
18473 }
18474 out:
18477 }
18479 /* Parse an enumerator-list. The enumerators all have the indicated
18480 TYPE.
18482 enumerator-list:
18483 enumerator-definition
18484 enumerator-list , enumerator-definition */
18486 static void
18488 {
18490 {
18491 /* Parse an enumerator-definition. */
18494 /* If the next token is not a ',', we've reached the end of
18495 the list. */
18498 /* Otherwise, consume the `,' and keep going. */
18500 /* If the next token is a `}', there is a trailing comma. */
18502 {
18507 }
18508 }
18509 }
18511 /* Parse an enumerator-definition. The enumerator has the indicated
18512 TYPE.
18514 enumerator-definition:
18515 enumerator
18516 enumerator = constant-expression
18518 enumerator:
18519 identifier
18521 GNU Extensions:
18523 enumerator-definition:
18524 enumerator attributes [opt]
18525 enumerator attributes [opt] = constant-expression */
18527 static void
18529 {
18530 tree identifier;
18531 tree value;
18532 location_t loc;
18534 /* Save the input location because we are interested in the location
18535 of the identifier and not the location of the explicit value. */
18538 /* Look for the identifier. */
18543 /* Parse any specified attributes. */
18546 /* If the next token is an '=', then there is an explicit value. */
18548 {
18549 /* Consume the `=' token. */
18551 /* Parse the value. */
18553 }
18554 else
18557 /* If we are processing a template, make sure the initializer of the
18558 enumerator doesn't contain any bare template parameter pack. */
18562 /* Create the enumerator. */
18564 }
18566 /* Parse a namespace-name.
18568 namespace-name:
18569 original-namespace-name
18570 namespace-alias
18572 Returns the NAMESPACE_DECL for the namespace. */
18574 static tree
18576 {
18577 tree identifier;
18578 tree namespace_decl;
18582 /* Get the name of the namespace. */
18587 /* Look up the identifier in the currently active scope. Look only
18588 for namespaces, due to:
18590 [basic.lookup.udir]
18592 When looking up a namespace-name in a using-directive or alias
18593 definition, only namespace names are considered.
18595 And:
18597 [basic.lookup.qual]
18599 During the lookup of a name preceding the :: scope resolution
18600 operator, object, function, and enumerator names are ignored.
18602 (Note that cp_parser_qualifying_entity only calls this
18603 function if the token after the name is the scope resolution
18604 operator.) */
18606 none_type,
18612 /* If it's not a namespace, issue an error. */
18615 {
18617 {
18623 }
18626 }
18629 }
18631 /* Parse a namespace-definition.
18633 namespace-definition:
18634 named-namespace-definition
18635 unnamed-namespace-definition
18637 named-namespace-definition:
18638 original-namespace-definition
18639 extension-namespace-definition
18641 original-namespace-definition:
18642 namespace identifier { namespace-body }
18644 extension-namespace-definition:
18645 namespace original-namespace-name { namespace-body }
18647 unnamed-namespace-definition:
18648 namespace { namespace-body } */
18650 static void
18652 {
18653 tree identifier;
18662 {
18665 }
18667 /* Look for the `namespace' keyword. */
18668 cp_token* token
18671 /* Parse any specified attributes before the identifier. */
18675 {
18679 {
18684 "standard attributes on namespaces must precede "
18687 /* Parse any attributes specified after the identifier. */
18689 }
18696 "nested namespace definitions only available with "
18699 /* Nested namespace names can create new namespaces (unlike
18700 other qualified-ids). */
18703 else
18706 }
18718 /* Start the namespace. */
18725 /* Look for the `{' to validate starting the namespace. */
18726 matching_braces braces;
18728 {
18729 /* Parse the body of the namespace. */
18732 /* Look for the final `}'. */
18734 }
18739 /* Pop the nested namespace definitions. */
18742 }
18744 /* Parse a namespace-body.
18746 namespace-body:
18747 declaration-seq [opt] */
18749 static void
18751 {
18753 }
18755 /* Parse a namespace-alias-definition.
18757 namespace-alias-definition:
18758 namespace identifier = qualified-namespace-specifier ; */
18760 static void
18762 {
18763 tree identifier;
18764 tree namespace_specifier;
18768 /* Look for the `namespace' keyword. */
18770 /* Look for the identifier. */
18774 /* Look for the `=' token. */
18777 {
18779 /* Skip the definition. */
18784 }
18786 /* Look for the qualified-namespace-specifier. */
18787 namespace_specifier
18789 /* Look for the `;' token. */
18792 /* Register the alias in the symbol table. */
18794 }
18796 /* Parse a qualified-namespace-specifier.
18798 qualified-namespace-specifier:
18799 :: [opt] nested-name-specifier [opt] namespace-name
18801 Returns a NAMESPACE_DECL corresponding to the specified
18802 namespace. */
18804 static tree
18806 {
18807 /* Look for the optional `::'. */
18811 /* Look for the optional nested-name-specifier. */
18819 }
18821 /* Parse a using-declaration, or, if ACCESS_DECLARATION_P is true, an
18822 access declaration.
18824 using-declaration:
18825 using typename [opt] :: [opt] nested-name-specifier unqualified-id ;
18826 using :: unqualified-id ;
18828 access-declaration:
18829 qualified-id ;
18831 */
18833 static bool
18836 {
18840 tree decl;
18841 tree identifier;
18842 tree qscope;
18847 {
18850 }
18851 else
18852 {
18853 /* Look for the `using' keyword. */
18856 again:
18857 /* Peek at the next token. */
18859 /* See if it's `typename'. */
18861 {
18862 /* Remember that we've seen it. */
18864 /* Consume the `typename' token. */
18866 }
18867 }
18869 /* Look for the optional global scope qualification. */
18870 global_scope_p
18875 /* If we saw `typename', or didn't see `::', then there must be a
18876 nested-name-specifier present. */
18878 {
18884 {
18887 }
18888 }
18889 /* Otherwise, we could be in either of the two productions. In that
18890 case, treat the nested-name-specifier as optional. */
18891 else
18903 /* Something has already gone wrong; there's no need to parse
18904 further. Since an error has occurred, the return value of
18905 cp_parser_parse_definitely will be false, as required. */
18909 /* Parse the unqualified-id. */
18917 {
18922 }
18924 {
18929 "pack expansion in using-declaration only available "
18932 }
18934 /* The function we call to handle a using-declaration is different
18935 depending on what scope we are in. */
18937 ;
18940 /* [namespace.udecl]
18942 A using declaration shall not name a template-id. */
18945 else
18946 {
18948 {
18949 /* Create the USING_DECL. */
18956 {
18959 }
18960 else
18961 /* Add it to the list of members in this class. */
18963 }
18964 else
18965 {
18967 identifier,
18974 {
18977 }
18980 else
18982 }
18983 }
18987 {
18991 "comma-separated list in using-declaration only available "
18994 }
18996 /* Look for the final `;'. */
19001 "access declarations are deprecated "
19002 "in favour of using-declarations; "
19006 }
19008 /* Parse an alias-declaration.
19010 alias-declaration:
19011 using identifier attribute-specifier-seq [opt] = type-id */
19013 static tree
19015 {
19017 location_t id_location;
19019 cp_decl_specifier_seq decl_specs;
19023 /* Look for the `using' keyword. */
19024 cp_token *using_token
19046 /* Now we are going to parse the type-id of the declaration. */
19048 /*
19049 [dcl.type]/3 says:
19051 "A type-specifier-seq shall not define a class or enumeration
19052 unless it appears in the type-id of an alias-declaration (7.1.3) that
19053 is not the declaration of a template-declaration."
19055 In other words, if we currently are in an alias template, the
19056 type-id should not define a type.
19058 So let's set parser->type_definition_forbidden_message in that
19059 case; cp_parser_check_type_definition (called by
19060 cp_parser_class_specifier) will then emit an error if a type is
19061 defined in the type-id. */
19063 {
19067 }
19071 /* Restore the error message if need be. */
19077 {
19080 }
19082 /* A typedef-name can also be introduced by an alias-declaration. The
19083 identifier following the using keyword becomes a typedef-name. It has
19084 the same semantics as if it were introduced by the typedef
19085 specifier. In particular, it does not define a new type and it shall
19086 not appear in the type-id. */
19091 {
19094 ds_attribute,
19095 attrs_token);
19096 }
19098 ds_typedef,
19099 using_token);
19101 ds_alias,
19102 using_token);
19108 id_location,
19119 else
19125 // Attach constraints to the alias declaration.
19127 {
19131 }
19138 /* If decl is a template, return its TEMPLATE_DECL so that it gets
19139 added into the symbol table; otherwise, return the TYPE_DECL. */
19143 {
19147 }
19150 }
19152 /* Parse a using-directive.
19154 using-directive:
19155 using namespace :: [opt] nested-name-specifier [opt]
19156 namespace-name ; */
19158 static void
19160 {
19161 tree namespace_decl;
19162 tree attribs;
19164 /* Look for the `using' keyword. */
19166 /* And the `namespace' keyword. */
19168 /* Look for the optional `::' operator. */
19170 /* And the optional nested-name-specifier. */
19176 /* Get the namespace being used. */
19178 /* And any specified attributes. */
19181 /* Update the symbol table. */
19184 else
19187 /* Look for the final `;'. */
19189 }
19191 /* Parse an asm-definition.
19193 asm-definition:
19194 asm ( string-literal ) ;
19196 GNU Extension:
19198 asm-definition:
19199 asm volatile [opt] ( string-literal ) ;
19200 asm volatile [opt] ( string-literal : asm-operand-list [opt] ) ;
19201 asm volatile [opt] ( string-literal : asm-operand-list [opt]
19202 : asm-operand-list [opt] ) ;
19203 asm volatile [opt] ( string-literal : asm-operand-list [opt]
19204 : asm-operand-list [opt]
19205 : asm-clobber-list [opt] ) ;
19206 asm volatile [opt] goto ( string-literal : : asm-operand-list [opt]
19207 : asm-clobber-list [opt]
19208 : asm-goto-list ) ; */
19210 static void
19212 {
19213 tree string;
19218 tree asm_stmt;
19226 /* Look for the `asm' keyword. */
19231 {
19234 }
19236 /* See if the next token is `volatile'. */
19239 {
19240 /* Remember that we saw the `volatile' keyword. */
19242 /* Consume the token. */
19244 }
19248 {
19249 /* Remember that we saw the `goto' keyword. */
19251 /* Consume the token. */
19253 }
19254 /* Look for the opening `('. */
19257 /* Look for the string. */
19260 {
19264 }
19266 /* If we're allowing GNU extensions, check for the extended assembly
19267 syntax. Unfortunately, the `:' tokens need not be separated by
19268 a space in C, and so, for compatibility, we tolerate that here
19269 too. Doing that means that we have to treat the `::' operator as
19270 two `:' tokens. */
19275 {
19280 /* The extended syntax was used. */
19283 /* Look for outputs. */
19285 {
19286 /* Consume the `:'. */
19288 /* Parse the output-operands. */
19290 CPP_COLON)
19292 CPP_SCOPE)
19294 CPP_CLOSE_PAREN)
19296 {
19300 }
19301 }
19302 /* If the next token is `::', there are no outputs, and the
19303 next token is the beginning of the inputs. */
19305 /* The inputs are coming next. */
19308 /* Look for inputs. */
19311 {
19312 /* Consume the `:' or `::'. */
19314 /* Parse the output-operands. */
19316 CPP_COLON)
19318 CPP_SCOPE)
19320 CPP_CLOSE_PAREN))
19321 {
19325 }
19326 }
19328 /* The clobbers are coming next. */
19331 /* Look for clobbers. */
19334 {
19336 /* Consume the `:' or `::'. */
19338 /* Parse the clobbers. */
19340 CPP_COLON)
19342 CPP_CLOSE_PAREN))
19344 }
19347 /* The labels are coming next. */
19350 /* Look for labels. */
19353 {
19355 /* Consume the `:' or `::'. */
19357 /* Parse the labels. */
19359 }
19363 }
19367 /* Look for the closing `)'. */
19375 {
19376 /* Create the ASM_EXPR. */
19378 {
19381 /* If the extended syntax was not used, mark the ASM_EXPR. */
19383 {
19389 }
19390 }
19391 else
19393 }
19394 }
19396 /* Given the type TYPE of a declaration with declarator DECLARATOR, return the
19397 type that comes from the decl-specifier-seq. */
19399 static tree
19401 {
19404 {
19417 }
19420 }
19422 /* Declarators [gram.dcl.decl] */
19424 /* Parse an init-declarator.
19426 init-declarator:
19427 declarator initializer [opt]
19429 GNU Extension:
19431 init-declarator:
19432 declarator asm-specification [opt] attributes [opt] initializer [opt]
19434 function-definition:
19435 decl-specifier-seq [opt] declarator ctor-initializer [opt]
19436 function-body
19437 decl-specifier-seq [opt] declarator function-try-block
19439 GNU Extension:
19441 function-definition:
19442 __extension__ function-definition
19444 TM Extension:
19446 function-definition:
19447 decl-specifier-seq [opt] declarator function-transaction-block
19449 The DECL_SPECIFIERS apply to this declarator. Returns a
19450 representation of the entity declared. If MEMBER_P is TRUE, then
19451 this declarator appears in a class scope. The new DECL created by
19452 this declarator is returned.
19454 The CHECKS are access checks that should be performed once we know
19455 what entity is being declared (and, therefore, what classes have
19456 befriended it).
19458 If FUNCTION_DEFINITION_ALLOWED_P then we handle the declarator and
19459 for a function-definition here as well. If the declarator is a
19460 declarator for a function-definition, *FUNCTION_DEFINITION_P will
19461 be TRUE upon return. By that point, the function-definition will
19462 have been completely parsed.
19464 FUNCTION_DEFINITION_P may be NULL if FUNCTION_DEFINITION_ALLOWED_P
19465 is FALSE.
19467 If MAYBE_RANGE_FOR_DECL is not NULL, the pointed tree will be set to the
19468 parsed declaration if it is an uninitialized single declarator not followed
19469 by a `;', or to error_mark_node otherwise. Either way, the trailing `;',
19470 if present, will not be consumed. If returned, this declarator will be
19471 created with SD_INITIALIZED but will not call cp_finish_decl.
19473 If INIT_LOC is not NULL, and *INIT_LOC is equal to UNKNOWN_LOCATION,
19474 and there is an initializer, the pointed location_t is set to the
19475 location of the '=' or `(', or '{' in C++11 token introducing the
19476 initializer. */
19478 static tree
19489 {
19493 tree prefix_attributes;
19495 tree asm_specification;
19496 tree initializer;
19498 tree scope;
19500 /* Only valid if IS_INITIALIZED is true. In that case, CPP_EQ if
19501 initialized with "= ..", CPP_OPEN_PAREN if initialized with
19502 "(...)". */
19513 /* Gather the attributes that were provided with the
19514 decl-specifiers. */
19517 /* Assume that this is not the declarator for a function
19518 definition. */
19522 /* Default arguments are only permitted for function parameters. */
19526 /* Defer access checks while parsing the declarator; we cannot know
19527 what names are accessible until we know what is being
19528 declared. */
19533 /* Parse the declarator. */
19534 declarator
19539 /* Gather up the deferred checks. */
19544 /* If the DECLARATOR was erroneous, there's no need to go
19545 further. */
19549 /* Check that the number of template-parameter-lists is OK. */
19559 /* Figure out what scope the entity declared by the DECLARATOR is
19560 located in. `grokdeclarator' sometimes changes the scope, so
19561 we compute it now. */
19564 /* Perform any lookups in the declared type which were thought to be
19565 dependent, but are not in the scope of the declarator. */
19566 decl_specifiers->type
19569 /* If we're allowing GNU extensions, look for an
19570 asm-specification. */
19572 {
19573 /* Look for an asm-specification. */
19576 }
19577 else
19580 /* Look for attributes. */
19584 /* Peek at the next token. */
19590 {
19591 /* Handle C++17 deduction guides. */
19595 {
19603 {
19607 }
19608 }
19610 /* Check to see if the token indicates the start of a
19611 function-definition. */
19613 {
19615 {
19616 /* If a function-definition should not appear here, issue an
19617 error message. */
19621 }
19623 location_t func_brace_location
19626 /* Neither attributes nor an asm-specification are allowed
19627 on a function-definition. */
19630 "an asm-specification is not allowed "
19634 "attributes are not allowed "
19636 /* This is a function-definition. */
19639 /* Parse the function definition. */
19642 decl_specifiers,
19643 declarator,
19644 prefix_attributes);
19645 else
19646 decl =
19647 (cp_parser_function_definition_from_specifiers_and_declarator
19651 {
19652 /* This is where the prologue starts... */
19655 }
19658 }
19659 }
19661 {
19662 /* A non-template declaration involving a function parameter list
19663 containing an implicit template parameter will be made into a
19664 template. If the resulting declaration is not going to be an
19665 actual function then finish the template scope here to prevent it.
19666 An error message will be issued once we have a decl to talk about.
19668 FIXME probably we should do type deduction rather than create an
19669 implicit template, but the standard currently doesn't allow it. */
19672 }
19674 /* [dcl.dcl]
19676 Only in function declarations for constructors, destructors, type
19677 conversions, and deduction guides can the decl-specifier-seq be omitted.
19679 We explicitly postpone this check past the point where we handle
19680 function-definitions because we tolerate function-definitions
19681 that are missing their return types in some modes. */
19683 {
19687 }
19689 /* An `=' or an `(', or an '{' in C++0x, indicates an initializer. */
19693 {
19704 {
19710 }
19711 }
19712 else
19713 {
19714 /* If the init-declarator isn't initialized and isn't followed by a
19715 `,' or `;', it's not a valid init-declarator. */
19718 {
19721 else
19722 {
19726 }
19727 }
19730 }
19732 /* Because start_decl has side-effects, we should only call it if we
19733 know we're going ahead. By this point, we know that we cannot
19734 possibly be looking at any other construct. */
19737 /* Enter the newly declared entry in the symbol table. If we're
19738 processing a declaration in a class-specifier, we wait until
19739 after processing the initializer. */
19741 {
19749 /* Adjust location of decl if declarator->id_loc is more appropriate:
19750 set, and decl wasn't merged with another decl, in which case its
19751 location would be different from input_location, and more accurate. */
19756 }
19758 /* Enter the SCOPE. That way unqualified names appearing in the
19759 initializer will be looked up in SCOPE. */
19762 /* Perform deferred access control checks, now that we know in which
19763 SCOPE the declared entity resides. */
19765 {
19768 /* If the entity being declared is a function, pretend that we
19769 are in its scope. If it is a `friend', it may have access to
19770 things that would not otherwise be accessible. */
19772 {
19775 }
19777 /* Perform access checks for template parameters. */
19780 /* Perform the access control checks for the declarator and the
19781 decl-specifiers. */
19784 /* Restore the saved value. */
19787 }
19789 /* Parse the initializer. */
19794 {
19796 {
19799 else
19800 {
19801 /* If the declaration was erroneous, we don't really
19802 know what the user intended, so just silently
19803 consume the initializer. */
19810 }
19811 }
19812 else
19813 {
19814 /* We want to record the extra mangling scope for in-class
19815 initializers of class members and initializers of static data
19816 member templates. The former involves deferring
19817 parsing of the initializer until end of class as with default
19818 arguments. So right here we only handle the latter. */
19828 }
19829 }
19831 /* The old parser allows attributes to appear after a parenthesized
19832 initializer. Mark Mitchell proposed removing this functionality
19833 on the GCC mailing lists on 2002-08-13. This parser accepts the
19834 attributes -- but ignores them. Made a permerror in GCC 8. */
19840 {
19843 {
19847 }
19848 }
19850 /* And now complain about a non-function implicit template. */
19855 /* For an in-class declaration, use `grokfield' to create the
19856 declaration. */
19858 {
19860 {
19863 }
19872 }
19874 /* Finish processing the declaration. But, skip member
19875 declarations. */
19877 {
19880 asm_specification,
19881 /* If the initializer is in parentheses, then this is
19882 a direct-initialization, which means that an
19883 `explicit' constructor is OK. Otherwise, an
19884 `explicit' constructor cannot be used. */
19887 }
19890 /* Core issue #226 (C++0x only): A default template-argument
19891 shall not be specified in a friend class template
19892 declaration. */
19901 {
19904 else
19906 }
19913 }
19915 /* Parse a declarator.
19917 declarator:
19918 direct-declarator
19919 ptr-operator declarator
19921 abstract-declarator:
19922 ptr-operator abstract-declarator [opt]
19923 direct-abstract-declarator
19925 GNU Extensions:
19927 declarator:
19928 attributes [opt] direct-declarator
19929 attributes [opt] ptr-operator declarator
19931 abstract-declarator:
19932 attributes [opt] ptr-operator abstract-declarator [opt]
19933 attributes [opt] direct-abstract-declarator
19935 If CTOR_DTOR_OR_CONV_P is not NULL, *CTOR_DTOR_OR_CONV_P is used to
19936 detect constructors, destructors, deduction guides, or conversion operators.
19937 It is set to -1 if the declarator is a name, and +1 if it is a
19938 function. Otherwise it is set to zero. Usually you just want to
19939 test for >0, but internally the negative value is used.
19941 (The reason for CTOR_DTOR_OR_CONV_P is that a declaration must have
19942 a decl-specifier-seq unless it declares a constructor, destructor,
19943 or conversion. It might seem that we could check this condition in
19944 semantic analysis, rather than parsing, but that makes it difficult
19945 to handle something like `f()'. We want to notice that there are
19946 no decl-specifiers, and therefore realize that this is an
19947 expression, not a declaration.)
19949 If PARENTHESIZED_P is non-NULL, *PARENTHESIZED_P is set to true iff
19950 the declarator is a direct-declarator of the form "(...)".
19952 MEMBER_P is true iff this declarator is a member-declarator.
19954 FRIEND_P is true iff this declarator is a friend. */
19958 cp_parser_declarator_kind dcl_kind,
19962 {
19965 cp_cv_quals cv_quals;
19966 tree class_type;
19969 /* Assume this is not a constructor, destructor, or type-conversion
19970 operator. */
19977 /* Check for the ptr-operator production. */
19979 /* Parse the ptr-operator. */
19985 /* If that worked, then we have a ptr-operator. */
19987 {
19988 /* If a ptr-operator was found, then this declarator was not
19989 parenthesized. */
19992 /* The dependent declarator is optional if we are parsing an
19993 abstract-declarator. */
19997 /* Parse the dependent declarator. */
20002 friend_p);
20004 /* If we are parsing an abstract-declarator, we must handle the
20005 case where the dependent declarator is absent. */
20010 declarator = cp_parser_make_indirect_declarator
20012 }
20013 /* Everything else is a direct-declarator. */
20014 else
20015 {
20018 CPP_OPEN_PAREN);
20020 ctor_dtor_or_conv_p,
20022 }
20027 }
20029 /* Parse a direct-declarator or direct-abstract-declarator.
20031 direct-declarator:
20032 declarator-id
20033 direct-declarator ( parameter-declaration-clause )
20034 cv-qualifier-seq [opt]
20035 ref-qualifier [opt]
20036 exception-specification [opt]
20037 direct-declarator [ constant-expression [opt] ]
20038 ( declarator )
20040 direct-abstract-declarator:
20041 direct-abstract-declarator [opt]
20042 ( parameter-declaration-clause )
20043 cv-qualifier-seq [opt]
20044 ref-qualifier [opt]
20045 exception-specification [opt]
20046 direct-abstract-declarator [opt] [ constant-expression [opt] ]
20047 ( abstract-declarator )
20049 Returns a representation of the declarator. DCL_KIND is
20050 CP_PARSER_DECLARATOR_ABSTRACT, if we are parsing a
20051 direct-abstract-declarator. It is CP_PARSER_DECLARATOR_NAMED, if
20052 we are parsing a direct-declarator. It is
20053 CP_PARSER_DECLARATOR_EITHER, if we can accept either - in the case
20054 of ambiguity we prefer an abstract declarator, as per
20055 [dcl.ambig.res]. CTOR_DTOR_OR_CONV_P, MEMBER_P, and FRIEND_P are
20056 as for cp_parser_declarator. */
20060 cp_parser_declarator_kind dcl_kind,
20063 {
20074 {
20075 /* Peek at the next token. */
20078 {
20079 /* This is either a parameter-declaration-clause, or a
20080 parenthesized declarator. When we know we are parsing a
20081 named declarator, it must be a parenthesized declarator
20082 if FIRST is true. For instance, `(int)' is a
20083 parameter-declaration-clause, with an omitted
20084 direct-abstract-declarator. But `((*))', is a
20085 parenthesized abstract declarator. Finally, when T is a
20086 template parameter `(T)' is a
20087 parameter-declaration-clause, and not a parenthesized
20088 named declarator.
20090 We first try and parse a parameter-declaration-clause,
20091 and then try a nested declarator (if FIRST is true).
20093 It is not an error for it not to be a
20094 parameter-declaration-clause, even when FIRST is
20095 false. Consider,
20097 int i (int);
20098 int i (3);
20100 The first is the declaration of a function while the
20101 second is the definition of a variable, including its
20102 initializer.
20104 Having seen only the parenthesis, we cannot know which of
20105 these two alternatives should be selected. Even more
20106 complex are examples like:
20108 int i (int (a));
20109 int i (int (3));
20111 The former is a function-declaration; the latter is a
20112 variable initialization.
20114 Thus again, we try a parameter-declaration-clause, and if
20115 that fails, we back out and return. */
20118 {
20119 tree params;
20124 /* In a member-declarator, the only valid interpretation
20125 of a parenthesis is the start of a
20126 parameter-declaration-clause. (It is invalid to
20127 initialize a static data member with a parenthesized
20128 initializer; only the "=" form of initialization is
20129 permitted.) */
20133 /* Consume the `('. */
20134 matching_parens parens;
20137 {
20138 /* If this is going to be an abstract declarator, we're
20139 in a declarator and we can't have default args. */
20142 }
20146 /* Parse the parameter-declaration-clause. */
20149 /* Consume the `)'. */
20152 /* If all went well, parse the cv-qualifier-seq,
20153 ref-qualifier and the exception-specification. */
20155 {
20156 cp_cv_quals cv_quals;
20157 cp_virt_specifiers virt_specifiers;
20158 cp_ref_qualifier ref_qual;
20159 tree exception_specification;
20160 tree late_return;
20161 tree attrs;
20171 /* Parse the cv-qualifier-seq. */
20173 /* Parse the ref-qualifier. */
20175 /* Parse the tx-qualifier. */
20177 /* And the exception-specification. */
20178 exception_specification
20183 /* In here, we handle cases where attribute is used after
20184 the function declaration. For example:
20185 void func (int x) __attribute__((vector(..))); */
20188 late_return = (cp_parser_late_return_type_opt
20192 /* Parse the virt-specifier-seq. */
20195 /* Create the function-declarator. */
20197 params,
20198 cv_quals,
20199 virt_specifiers,
20200 ref_qual,
20201 tx_qual,
20202 exception_specification,
20203 late_return,
20204 requires_clause);
20207 /* Any subsequent parameter lists are to do with
20208 return type, so are not those of the declared
20209 function. */
20211 }
20213 /* Remove the function parms from scope. */
20217 /* Repeat the main loop. */
20219 }
20221 /* If this is the first, we can try a parenthesized
20222 declarator. */
20224 {
20231 /* Consume the `('. */
20232 matching_parens parens;
20234 /* Parse the nested declarator. */
20237 declarator
20243 /* Expect a `)'. */
20251 }
20252 /* Otherwise, we must be done. */
20253 else
20255 }
20259 {
20260 /* Parse an array-declarator. */
20270 /* Consume the `['. */
20272 /* Peek at the next token. */
20274 /* If the next token is `]', then there is no
20275 constant-expression. */
20277 {
20279 bounds
20289 {
20290 /* Normally, the array bound must be an integral constant
20291 expression. However, as an extension, we allow VLAs
20292 in function scopes as long as they aren't part of a
20293 parameter declaration. */
20297 }
20300 {
20301 /* Remember this wasn't a constant-expression. */
20304 }
20305 }
20306 else
20308 /* Look for the closing `]'. */
20310 {
20313 }
20318 }
20320 {
20321 {
20322 tree qualifying_scope;
20323 tree unqualified_name;
20324 tree attrs;
20325 special_function_kind sfk;
20330 /* Parse a declarator-id */
20333 {
20336 /* If we see an ellipsis, we should be looking at a
20337 parameter pack. */
20339 {
20340 /* Consume the `...' */
20344 }
20345 }
20348 unqualified_name
20352 {
20356 {
20357 /* Check whether an error occurred. */
20360 /* We already consumed the ellipsis to mark a
20361 parameter pack, but we have no way to report it,
20362 so abort the tentative parse. We will be exiting
20363 immediately anyway. */
20365 }
20366 else
20372 && (qualifying_scope
20374 {
20377 }
20378 }
20383 {
20388 }
20394 {
20395 /* In the declaration of a member of a template class
20396 outside of the class itself, the SCOPE will sometimes
20397 be a TYPENAME_TYPE. For example, given:
20399 template <typename T>
20400 int S<T>::R::i = 3;
20402 the SCOPE will be a TYPENAME_TYPE for `S<T>::R'. In
20403 this context, we must resolve S<T>::R to an ordinary
20404 type, rather than a typename type.
20406 The reason we normally avoid resolving TYPENAME_TYPEs
20407 is that a specialization of `S' might render
20408 `S<T>::R' not a type. However, if `S' is
20409 specialized, then this `i' will not be used, so there
20410 is no harm in resolving the types here. */
20411 tree type;
20413 /* Resolve the TYPENAME_TYPE. */
20416 /* If that failed, the declarator is invalid. */
20418 {
20421 "cannot define member of dependent typedef "
20423 else
20428 }
20430 }
20435 {
20436 tree class_type;
20441 else
20445 {
20449 {
20450 /* We do not attempt to print the declarator
20451 here because we do not have enough
20452 information about its original syntactic
20453 form. */
20457 }
20460 {
20464 "use %<%T::%D%> instead of %<%T::%D%> to "
20466 class_type,
20471 }
20473 }
20476 {
20483 for an unnamed type, even if the type
20484 got a name for linkage purposes. */
20486 /* Handle correctly (c++/19200):
20488 struct S {
20489 struct T{};
20490 friend void S(T);
20491 };
20493 and also:
20495 namespace N {
20496 void S();
20497 }
20499 struct S {
20500 friend void N::S();
20501 }; */
20504 class_type))
20513 }
20514 }
20516 unqualified_name,
20517 sfk);
20524 }
20526 handle_declarator:;
20529 {
20530 /* Any names that appear after the declarator-id for a
20531 member are looked up in the containing scope. */
20533 {
20534 /* But declarations with qualified-ids can't appear in a
20535 function. */
20539 }
20541 }
20545 /* Default args are only allowed on function
20546 declarations. */
20548 else
20552 }
20553 /* We're done. */
20554 else
20556 }
20558 /* For an abstract declarator, we might wind up with nothing at this
20559 point. That's an error; the declarator is not optional. */
20563 {
20564 /* Record overly parenthesized declarator so we can give a
20565 diagnostic about confusing decl/expr disambiguation. */
20567 {
20568 /* If the open and close parens are on different lines, this
20569 is probably a formatting thing, so ignore. */
20574 }
20577 }
20579 /* If we entered a scope, we must exit it now. */
20587 }
20589 /* Parse a ptr-operator.
20591 ptr-operator:
20592 * attribute-specifier-seq [opt] cv-qualifier-seq [opt] (C++11)
20593 * cv-qualifier-seq [opt]
20594 &
20595 :: [opt] nested-name-specifier * cv-qualifier-seq [opt]
20596 nested-name-specifier * attribute-specifier-seq [opt] cv-qualifier-seq [opt] (C++11)
20598 GNU Extension:
20600 ptr-operator:
20601 & cv-qualifier-seq [opt]
20603 Returns INDIRECT_REF if a pointer, or pointer-to-member, was used.
20604 Returns ADDR_EXPR if a reference was used, or NON_LVALUE_EXPR for
20605 an rvalue reference. In the case of a pointer-to-member, *TYPE is
20606 filled in with the TYPE containing the member. *CV_QUALS is
20607 filled in with the cv-qualifier-seq, or TYPE_UNQUALIFIED, if there
20608 are no cv-qualifiers. Returns ERROR_MARK if an error occurred.
20609 Note that the tree codes returned by this function have nothing
20610 to do with the types of trees that will be eventually be created
20611 to represent the pointer or reference type being parsed. They are
20612 just constants with suggestive names. */
20613 static enum tree_code
20618 {
20623 /* Assume that it's not a pointer-to-member. */
20625 /* And that there are no cv-qualifiers. */
20628 /* Peek at the next token. */
20631 /* If it's a `*', `&' or `&&' we have a pointer or reference. */
20641 {
20642 /* Consume the `*', `&' or `&&'. */
20645 /* A `*' can be followed by a cv-qualifier-seq, and so can a
20646 `&', if we are allowing GNU extensions. (The only qualifier
20647 that can legally appear after `&' is `restrict', but that is
20648 enforced during semantic analysis. */
20656 }
20657 else
20658 {
20659 /* Try the pointer-to-member case. */
20661 /* Look for the optional `::' operator. */
20664 /* Look for the nested-name specifier. */
20671 /* If we found it, and the next token is a `*', then we are
20672 indeed looking at a pointer-to-member operator. */
20675 {
20676 /* Indicate that the `*' operator was used. */
20684 else
20685 {
20686 /* The type of which the member is a member is given by the
20687 current SCOPE. */
20689 /* The next name will not be qualified. */
20693 /* Look for optional c++11 attributes. */
20697 /* Look for the optional cv-qualifier-seq. */
20699 }
20700 }
20701 /* If that didn't work we don't have a ptr-operator. */
20704 }
20707 }
20709 /* Parse an (optional) cv-qualifier-seq.
20711 cv-qualifier-seq:
20712 cv-qualifier cv-qualifier-seq [opt]
20714 cv-qualifier:
20715 const
20716 volatile
20718 GNU Extension:
20720 cv-qualifier:
20721 __restrict__
20723 Returns a bitmask representing the cv-qualifiers. */
20725 static cp_cv_quals
20727 {
20731 {
20733 cp_cv_quals cv_qualifier;
20735 /* Peek at the next token. */
20737 /* See if it's a cv-qualifier. */
20739 {
20755 }
20761 {
20766 }
20767 else
20768 {
20771 }
20772 }
20775 }
20777 /* Parse an (optional) ref-qualifier
20779 ref-qualifier:
20780 &
20781 &&
20783 Returns cp_ref_qualifier representing ref-qualifier. */
20785 static cp_ref_qualifier
20787 {
20790 /* Don't try to parse bitwise '&' as a ref-qualifier (c++/57532). */
20795 {
20800 {
20812 }
20817 {
20820 }
20821 else
20822 {
20825 }
20826 }
20829 }
20831 /* Parse an optional tx-qualifier.
20833 tx-qualifier:
20834 transaction_safe
20835 transaction_safe_dynamic */
20837 static tree
20839 {
20842 {
20847 {
20851 {
20854 {
20857 }
20858 else
20860 }
20861 }
20862 }
20864 }
20866 /* Parse an (optional) virt-specifier-seq.
20868 virt-specifier-seq:
20869 virt-specifier virt-specifier-seq [opt]
20871 virt-specifier:
20872 override
20873 final
20875 Returns a bitmask representing the virt-specifiers. */
20877 static cp_virt_specifiers
20879 {
20883 {
20885 cp_virt_specifiers virt_specifier;
20887 /* Peek at the next token. */
20889 /* See if it's a virt-specifier-qualifier. */
20893 {
20896 }
20898 {
20901 }
20903 {
20905 }
20906 else
20910 {
20915 }
20916 else
20917 {
20920 }
20921 }
20923 }
20925 /* Used by handling of trailing-return-types and NSDMI, in which 'this'
20926 is in scope even though it isn't real. */
20928 void
20930 {
20931 tree this_parm;
20934 {
20935 /* We don't clear this between NSDMIs. Is it already what we want? */
20942 }
20945 /* Clear this first to avoid shortcut in cp_build_indirect_ref. */
20947 current_class_ref
20950 }
20952 /* Return true iff our current scope is a non-static data member
20953 initializer. */
20955 bool
20957 {
20958 /* We recognize NSDMI context by the context-less 'this' pointer set up
20959 by the function above. */
20965 }
20967 /* Parse a late-specified return type, if any. This is not a separate
20968 non-terminal, but part of a function declarator, which looks like
20970 -> trailing-type-specifier-seq abstract-declarator(opt)
20972 Returns the type indicated by the type-id.
20974 In addition to this, parse any queued up #pragma omp declare simd
20975 clauses, and #pragma acc routine clauses.
20977 QUALS is either a bitmask of cv_qualifiers or -1 for a non-member
20978 function. */
20980 static tree
20983 {
20987 && declarator
20991 && declarator
20994 /* Peek at the next token. */
20996 /* A late-specified return type is indicated by an initial '->'. */
21007 {
21008 /* DR 1207: 'this' is in scope in the trailing return type. */
21010 }
21013 {
21014 /* Consume the ->. */
21018 }
21020 /* Function declarations may be followed by a trailing
21021 requires-clause. */
21025 declarator->attributes
21029 declarator->attributes
21034 {
21037 }
21040 }
21042 /* Parse a declarator-id.
21044 declarator-id:
21045 id-expression
21046 :: [opt] nested-name-specifier [opt] type-name
21048 In the `id-expression' case, the value returned is as for
21049 cp_parser_id_expression if the id-expression was an unqualified-id.
21050 If the id-expression was a qualified-id, then a SCOPE_REF is
21051 returned. The first operand is the scope (either a NAMESPACE_DECL
21052 or TREE_TYPE), but the second is still just a representation of an
21053 unqualified-id. */
21055 static tree
21057 {
21058 tree id;
21059 /* The expression must be an id-expression. Assume that qualified
21060 names are the names of types so that:
21062 template <class T>
21063 int S<T>::R::i = 3;
21065 will work; we must treat `S<T>::R' as the name of a type.
21066 Similarly, assume that qualified names are templates, where
21067 required, so that:
21069 template <class T>
21070 int S<T>::R<T>::i = 3;
21072 will work, too. */
21078 optional_p);
21082 }
21084 /* Parse a type-id.
21086 type-id:
21087 type-specifier-seq abstract-declarator [opt]
21089 Returns the TYPE specified. */
21091 static tree
21094 {
21095 cp_decl_specifier_seq type_specifier_seq;
21098 /* Parse the type-specifier-seq. */
21100 is_trailing_return,
21105 /* A bare template name as a template argument is a template template
21106 argument, not a placeholder, so fail parsing it as a type argument. */
21107 {
21111 }
21115 /* There might or might not be an abstract declarator. */
21117 /* Look for the declarator. */
21118 abstract_declarator
21123 /* Check to see if there really was a declarator. */
21128 /* The concepts TS allows 'auto' as a type-id. */
21130 /* None of the valid uses of 'auto' in C++14 involve the type-id
21131 nonterminal, but it is valid in a trailing-return-type. */
21134 {
21135 /* A type-id with type 'auto' is only ok if the abstract declarator
21136 is a function declarator with a late-specified return type.
21138 A type-id with 'auto' is also valid in a trailing-return-type
21139 in a compound-requirement. */
21146 else
21147 {
21150 {
21152 auto_node);
21154 tmpl);
21155 }
21156 else
21159 }
21160 }
21163 is_template_arg);
21164 }
21166 static tree
21168 {
21170 }
21172 static tree
21174 {
21175 tree r;
21177 parser->type_definition_forbidden_message
21182 {
21185 }
21187 }
21189 static tree
21191 {
21193 }
21195 /* Parse a type-specifier-seq.
21197 type-specifier-seq:
21198 type-specifier type-specifier-seq [opt]
21200 GNU extension:
21202 type-specifier-seq:
21203 attributes type-specifier-seq [opt]
21205 If IS_DECLARATION is true, we are at the start of a "condition" or
21206 exception-declaration, so we might be followed by a declarator-id.
21208 If IS_TRAILING_RETURN is true, we are in a trailing-return-type,
21209 i.e. we've just seen "->".
21211 Sets *TYPE_SPECIFIER_SEQ to represent the sequence. */
21213 static void
21218 {
21223 /* Clear the TYPE_SPECIFIER_SEQ. */
21226 /* In the context of a trailing return type, enum E { } is an
21227 elaborated-type-specifier followed by a function-body, not an
21228 enum-specifier. */
21232 /* Parse the type-specifiers and attributes. */
21234 {
21235 tree type_specifier;
21238 /* Check for attributes first. */
21240 {
21241 type_specifier_seq->attributes
21245 }
21247 /* record the token of the beginning of the type specifier seq,
21248 for error reporting purposes*/
21252 /* Look for the type-specifier. */
21254 flags,
21255 type_specifier_seq,
21257 NULL,
21260 {
21261 /* If the first type-specifier could not be found, this is not a
21262 type-specifier-seq at all. */
21264 {
21265 /* Set in_declarator_p to avoid skipping to the semicolon. */
21277 }
21278 /* If subsequent type-specifiers could not be found, the
21279 type-specifier-seq is complete. */
21281 }
21284 /* The standard says that a condition can be:
21286 type-specifier-seq declarator = assignment-expression
21288 However, given:
21290 struct S {};
21291 if (int S = ...)
21293 we should treat the "S" as a declarator, not as a
21294 type-specifier. The standard doesn't say that explicitly for
21295 type-specifier-seq, but it does say that for
21296 decl-specifier-seq in an ordinary declaration. Perhaps it
21297 would be clearer just to allow a decl-specifier-seq here, and
21298 then add a semantic restriction that if any decl-specifiers
21299 that are not type-specifiers appear, the program is invalid. */
21302 }
21303 }
21305 /* Return whether the function currently being declared has an associated
21306 template parameter list. */
21308 static bool
21310 {
21323 }
21325 /* Parse a parameter-declaration-clause.
21327 parameter-declaration-clause:
21328 parameter-declaration-list [opt] ... [opt]
21329 parameter-declaration-list , ...
21331 Returns a representation for the parameter declarations. A return
21332 value of NULL indicates a parameter-declaration-clause consisting
21333 only of an ellipsis. */
21335 static tree
21337 {
21338 tree parameters;
21346 && !processing_template_parmlist
21347 && !processing_explicit_instantiation
21348 /* default_arg_ok_p tracks whether this is a parameter-clause for an
21349 actual function or a random abstract declarator. */
21355 /* Peek at the next token. */
21357 /* Check for trivial parameter-declaration-clauses. */
21359 {
21360 /* Consume the `...' token. */
21363 }
21365 /* There are no parameters. */
21366 {
21367 #ifdef SYSTEM_IMPLICIT_EXTERN_C
21372 else
21373 #endif
21375 }
21376 /* Check for `(void)', too, which is a special case. */
21380 {
21381 /* Consume the `void' token. */
21383 /* There are no parameters. */
21385 }
21387 /* Parse the parameter-declaration-list. */
21389 /* If a parse error occurred while parsing the
21390 parameter-declaration-list, then the entire
21391 parameter-declaration-clause is erroneous. */
21395 /* Peek at the next token. */
21397 /* If it's a `,', the clause should terminate with an ellipsis. */
21399 {
21400 /* Consume the `,'. */
21402 /* Expect an ellipsis. */
21403 ellipsis_p
21405 }
21406 /* It might also be `...' if the optional trailing `,' was
21407 omitted. */
21409 {
21410 /* Consume the `...' token. */
21412 /* And remember that we saw it. */
21414 }
21415 else
21418 /* Finish the parameter list. */
21423 }
21425 /* Parse a parameter-declaration-list.
21427 parameter-declaration-list:
21428 parameter-declaration
21429 parameter-declaration-list , parameter-declaration
21431 Returns a representation of the parameter-declaration-list, as for
21432 cp_parser_parameter_declaration_clause. However, the
21433 `void_list_node' is never appended to the list. */
21435 static tree
21437 {
21443 /* The special considerations that apply to a function within an
21444 unbraced linkage specifications do not apply to the parameters
21445 to the function. */
21446 saved_in_unbraced_linkage_specification_p
21450 /* Look for more parameters. */
21452 {
21457 /* Parse the parameter. */
21458 parameter
21463 /* We don't know yet if the enclosing context is deprecated, so wait
21464 and warn in grokparms if appropriate. */
21468 {
21471 PARM,
21476 }
21480 /* If a parse error occurred parsing the parameter declaration,
21481 then the entire parameter-declaration-list is erroneous. */
21483 {
21486 }
21496 {
21500 }
21502 /* Add the new parameter to the list. */
21506 /* Peek at the next token. */
21509 /* These are for Objective-C++ */
21512 /* The parameter-declaration-list is complete. */
21515 {
21518 /* Peek at the next token. */
21520 /* If it's an ellipsis, then the list is complete. */
21523 /* Otherwise, there must be more parameters. Consume the
21524 `,'. */
21526 /* When parsing something like:
21528 int i(float f, double d)
21530 we can tell after seeing the declaration for "f" that we
21531 are not looking at an initialization of a variable "i",
21532 but rather at the declaration of a function "i".
21534 Due to the fact that the parsing of template arguments
21535 (as specified to a template-id) requires backtracking we
21536 cannot use this technique when inside a template argument
21537 list. */
21541 /* However, a parameter-declaration of the form
21542 "float(f)" (which is a valid declaration of a
21543 parameter "f") can also be interpreted as an
21544 expression (the conversion of "f" to "float"). */
21547 }
21548 else
21549 {
21557 }
21558 }
21560 parser->in_unbraced_linkage_specification_p
21563 /* Reset implicit_template_scope if we are about to leave the function
21564 parameter list that introduced it. Note that for out-of-line member
21565 definitions, there will be one or more class scopes before we get to
21566 the template parameter scope. */
21570 {
21574 {
21577 }
21578 }
21581 }
21583 /* Parse a parameter declaration.
21585 parameter-declaration:
21586 decl-specifier-seq ... [opt] declarator
21587 decl-specifier-seq declarator = assignment-expression
21588 decl-specifier-seq ... [opt] abstract-declarator [opt]
21589 decl-specifier-seq abstract-declarator [opt] = assignment-expression
21591 If TEMPLATE_PARM_P is TRUE, then this parameter-declaration
21592 declares a template parameter. (In that case, a non-nested `>'
21593 token encountered during the parsing of the assignment-expression
21594 is not interpreted as a greater-than operator.)
21596 Returns a representation of the parameter, or NULL if an error
21597 occurs. If PARENTHESIZED_P is non-NULL, *PARENTHESIZED_P is set to
21598 true iff the declarator is of the form "(p)". */
21604 {
21606 cp_decl_specifier_seq decl_specifiers;
21608 tree default_argument;
21613 /* In a template parameter, `>' is not an operator.
21615 [temp.param]
21617 When parsing a default template-argument for a non-type
21618 template-parameter, the first non-nested `>' is taken as the end
21619 of the template parameter-list rather than a greater-than
21620 operator. */
21622 /* Type definitions may not appear in parameter types. */
21624 parser->type_definition_forbidden_message
21631 /* Parse the declaration-specifiers. */
21634 CP_PARSER_FLAGS_NONE,
21638 /* Complain about missing 'typename' or other invalid type names. */
21643 /* If an error occurred, there's no reason to attempt to parse the
21644 rest of the declaration. */
21646 {
21649 }
21651 /* Peek at the next token. */
21654 /* If the next token is a `)', `,', `=', `>', or `...', then there
21655 is no declarator. However, when variadic templates are enabled,
21656 there may be a declarator following `...'. */
21661 {
21665 }
21666 /* Otherwise, there should be a declarator. */
21667 else
21668 {
21672 /* After seeing a decl-specifier-seq, if the next token is not a
21673 "(", there is no possibility that the code is a valid
21674 expression. Therefore, if parsing tentatively, we commit at
21675 this point. */
21677 /* In an expression context, having seen:
21679 (int((char ...
21681 we cannot be sure whether we are looking at a
21682 function-type (taking a "char" as a parameter) or a cast
21683 of some object of type "char" to "int". */
21689 /* Parse the declarator. */
21692 CP_PARSER_DECLARATOR_EITHER,
21694 parenthesized_p,
21698 /* After the declarator, allow more attributes. */
21699 decl_specifiers.attributes
21703 /* If the declarator is a template parameter pack, remember that and
21704 clear the flag in the declarator itself so we don't get errors
21705 from grokdeclarator. */
21707 {
21710 }
21711 }
21713 /* If the next token is an ellipsis, and we have not seen a declarator
21714 name, and if either the type of the declarator contains parameter
21715 packs but it is not a TYPE_PACK_EXPANSION or is null (this happens
21716 for, eg, abbreviated integral type names), then we actually have a
21717 parameter pack expansion expression. Otherwise, leave the ellipsis
21718 for a C-style variadic function. */
21721 /* If a function parameter pack was specified and an implicit template
21722 parameter was introduced during cp_parser_parameter_declaration,
21723 change any implicit parameters introduced into packs. */
21728 {
21736 }
21739 {
21750 {
21751 /* Consume the `...'. */
21755 /* Build a pack expansion type */
21760 else
21762 }
21763 }
21765 /* The restriction on defining new types applies only to the type
21766 of the parameter, not to the default argument. */
21769 /* If the next token is `=', then process a default argument. */
21771 {
21774 /* If we are defining a class, then the tokens that make up the
21775 default argument must be saved and processed later. */
21781 // A constrained-type-specifier may declare a type template-parameter.
21783 default_argument
21786 // A constrained-type-specifier may declare a template-template-parameter.
21788 default_argument
21791 /* Outside of a class definition, we can just parse the
21792 assignment-expression. */
21793 else
21794 default_argument
21798 {
21800 "default arguments are only "
21802 }
21804 || template_parameter_pack_p
21807 {
21808 /* Find the name of the parameter pack. */
21815 template_parm_p
21821 else
21823 template_parm_p
21830 }
21831 }
21832 else
21835 /* Generate a location for the parameter, ranging from the start of the
21836 initial token to the end of the final token (using input_location for
21837 the latter, set up by cp_lexer_set_source_position_from_token when
21838 consuming tokens).
21840 If we have a identifier, then use it for the caret location, e.g.
21842 extern int callee (int one, int (*two)(int, int), float three);
21843 ~~~~~~^~~~~~~~~~~~~~
21845 otherwise, reuse the start location for the caret location e.g.:
21847 extern int callee (int one, int (*)(int, int), float three);
21848 ^~~~~~~~~~~~~~~~~
21850 */
21856 input_location);
21859 declarator,
21860 default_argument,
21861 param_loc,
21862 template_parameter_pack_p);
21863 }
21865 /* Parse a default argument and return it.
21867 TEMPLATE_PARM_P is true if this is a default argument for a
21868 non-type template parameter. */
21869 static tree
21871 {
21877 /* Make sure that PARSER->GREATER_THAN_IS_OPERATOR_P is
21878 set correctly. */
21881 /* Local variable names (and the `this' keyword) may not
21882 appear in a default argument. */
21885 /* Parse the assignment-expression. */
21890 /* The "this" pointer is not valid in a default argument. */
21892 {
21897 }
21898 default_argument
21900 /* Restore the "this" pointer. */
21902 {
21905 }
21914 }
21916 /* Parse a function-body.
21918 function-body:
21919 compound_statement */
21921 static void
21923 {
21927 }
21929 /* Parse a ctor-initializer-opt followed by a function-body. Return
21930 true if a ctor-initializer was present. When IN_FUNCTION_TRY_BLOCK
21931 is true we are parsing a function-try-block. */
21933 static void
21936 {
21943 /* Begin the function body. */
21945 /* Parse the optional ctor-initializer. */
21948 /* If we're parsing a constexpr constructor definition, we need
21949 to check that the constructor body is indeed empty. However,
21950 before we get to cp_parser_function_body lot of junk has been
21951 generated, so we can't just check that we have an empty block.
21952 Rather we take a snapshot of the outermost block, and check whether
21953 cp_parser_function_body changed its state. */
21955 {
21959 }
21960 /* Parse the function-body. */
21964 /* Finish the function body. */
21966 }
21968 /* Parse an initializer.
21970 initializer:
21971 = initializer-clause
21972 ( expression-list )
21974 Returns an expression representing the initializer. If no
21975 initializer is present, NULL_TREE is returned.
21977 *IS_DIRECT_INIT is set to FALSE if the `= initializer-clause'
21978 production is used, and TRUE otherwise. *IS_DIRECT_INIT is
21979 set to TRUE if there is no initializer present. If there is an
21980 initializer, and it is not a constant-expression, *NON_CONSTANT_P
21981 is set to true; otherwise it is set to false. */
21983 static tree
21986 {
21988 tree init;
21990 /* Peek at the next token. */
21993 /* Let our caller know whether or not this initializer was
21994 parenthesized. */
21996 /* Assume that the initializer is constant. */
22000 {
22001 /* Consume the `='. */
22003 /* Parse the initializer-clause. */
22005 }
22007 {
22012 non_constant_p);
22017 }
22019 {
22024 }
22025 else
22026 {
22027 /* Anything else is an error. */
22030 }
22036 }
22038 /* Parse an initializer-clause.
22040 initializer-clause:
22041 assignment-expression
22042 braced-init-list
22044 Returns an expression representing the initializer.
22046 If the `assignment-expression' production is used the value
22047 returned is simply a representation for the expression.
22049 Otherwise, calls cp_parser_braced_list. */
22051 static cp_expr
22053 {
22054 cp_expr initializer;
22056 /* Assume the expression is constant. */
22059 /* If it is not a `{', then we are looking at an
22060 assignment-expression. */
22062 {
22063 initializer
22066 non_constant_p);
22067 }
22068 else
22072 }
22074 /* Parse a brace-enclosed initializer list.
22076 braced-init-list:
22077 { initializer-list , [opt] }
22078 { designated-initializer-list , [opt] }
22079 { }
22081 Returns a CONSTRUCTOR. The CONSTRUCTOR_ELTS will be
22082 the elements of the initializer-list (or NULL, if the last
22083 production is used). The TREE_TYPE for the CONSTRUCTOR will be
22084 NULL_TREE. There is no way to detect whether or not the optional
22085 trailing `,' was provided. NON_CONSTANT_P is as for
22086 cp_parser_initializer. */
22088 static cp_expr
22090 {
22091 tree initializer;
22094 /* Consume the `{' token. */
22095 matching_braces braces;
22097 /* Create a CONSTRUCTOR to represent the braced-initializer. */
22099 /* If it's not a `}', then there is a non-trivial initializer. */
22101 {
22102 /* Parse the initializer list. */
22105 /* A trailing `,' token is allowed. */
22108 }
22109 else
22111 /* Now, there should be a trailing `}'. */
22117 /* Build a location of the form:
22118 { ... }
22119 ^~~~~~~
22120 with caret==start at the open brace, finish at the close brace. */
22124 }
22126 /* Consume tokens up to, and including, the next non-nested closing `]'.
22127 Returns true iff we found a closing `]'. */
22129 static bool
22131 {
22135 {
22139 {
22142 /* If we've run out of tokens, then there is no closing `]'. */
22151 {
22154 }
22159 }
22161 /* Consume the token. */
22163 }
22164 }
22166 /* Return true if we are looking at an array-designator, false otherwise. */
22168 static bool
22170 {
22171 /* Consume the `['. */
22176 /* Skip tokens until the next token is a closing square bracket.
22177 If we find the closing `]', and the next token is a `=', then
22178 we are looking at an array designator. */
22179 bool array_designator_p
22183 /* Roll back the tokens we skipped. */
22187 }
22189 /* Parse an initializer-list.
22191 initializer-list:
22192 initializer-clause ... [opt]
22193 initializer-list , initializer-clause ... [opt]
22195 C++2A Extension:
22197 designated-initializer-list:
22198 designated-initializer-clause
22199 designated-initializer-list , designated-initializer-clause
22201 designated-initializer-clause:
22202 designator brace-or-equal-initializer
22204 designator:
22205 . identifier
22207 GNU Extension:
22209 initializer-list:
22210 designation initializer-clause ...[opt]
22211 initializer-list , designation initializer-clause ...[opt]
22213 designation:
22214 . identifier =
22215 identifier :
22216 [ constant-expression ] =
22218 Returns a vec of constructor_elt. The VALUE of each elt is an expression
22219 for the initializer. If the INDEX of the elt is non-NULL, it is the
22220 IDENTIFIER_NODE naming the field to initialize. NON_CONSTANT_P is
22221 as for cp_parser_initializer. */
22225 {
22230 /* Assume all of the expressions are constant. */
22233 /* Parse the rest of the list. */
22235 {
22237 tree designator;
22238 tree initializer;
22242 /* Handle the C++2A syntax, '. id ='. */
22250 {
22253 "C++ designated initializers only available with "
22255 /* Consume the `.'. */
22257 /* Consume the identifier. */
22260 /* Consume the `='. */
22262 }
22263 /* Also, if the next token is an identifier and the following one is a
22264 colon, we are looking at the GNU designated-initializer
22265 syntax. */
22270 {
22271 /* Warn the user that they are using an extension. */
22274 /* Consume the identifier. */
22276 /* Consume the `:'. */
22278 }
22279 /* Also handle C99 array designators, '[ const ] ='. */
22283 {
22284 /* In C++11, [ could start a lambda-introducer. */
22290 {
22293 }
22294 else
22295 {
22300 }
22305 && (!require_potential_rvalue_constant_expression
22309 /* Warn the user that they are using an extension. */
22312 }
22313 else
22317 {
22320 }
22324 {
22328 }
22332 /* Parse the initializer. */
22335 /* If any clause is non-constant, so is the entire initializer. */
22339 /* If we have an ellipsis, this is an initializer pack
22340 expansion. */
22342 {
22345 /* Consume the `...'. */
22352 /* Turn the initializer into an initializer expansion. */
22354 }
22356 /* Add it to the vector. */
22359 /* If the next token is not a comma, we have reached the end of
22360 the list. */
22364 /* Peek at the next token. */
22366 /* If the next token is a `}', then we're still done. An
22367 initializer-clause can have a trailing `,' after the
22368 initializer-list and before the closing `}'. */
22372 /* Consume the `,' token. */
22374 }
22376 /* The same identifier shall not appear in multiple designators
22377 of a designated-initializer-list. */
22379 {
22384 {
22386 {
22388 "%<.%s%> designator used multiple times in "
22392 }
22393 else
22395 }
22399 }
22402 }
22404 /* Classes [gram.class] */
22406 /* Parse a class-name.
22408 class-name:
22409 identifier
22410 template-id
22412 TYPENAME_KEYWORD_P is true iff the `typename' keyword has been used
22413 to indicate that names looked up in dependent types should be
22414 assumed to be types. TEMPLATE_KEYWORD_P is true iff the `template'
22415 keyword has been used to indicate that the name that appears next
22416 is a template. TAG_TYPE indicates the explicit tag given before
22417 the type name, if any. If CHECK_DEPENDENCY_P is FALSE, names are
22418 looked up in dependent scopes. If CLASS_HEAD_P is TRUE, this class
22419 is the class being defined in a class-head. If ENUM_OK is TRUE,
22420 enum-names are also accepted.
22422 Returns the TYPE_DECL representing the class. */
22424 static tree
22433 {
22434 tree decl;
22435 tree scope;
22440 /* All class-names start with an identifier. */
22443 {
22446 }
22448 /* PARSER->SCOPE can be cleared when parsing the template-arguments
22449 to a template-id, so we save it here. */
22454 /* Any name names a type if we're following the `typename' keyword
22455 in a qualified name where the enclosing scope is type-dependent. */
22458 /* Handle the common case (an identifier, but not a template-id)
22459 efficiently. */
22462 {
22466 /* Look for the identifier. */
22470 /* If the next token isn't an identifier, we are certainly not
22471 looking at a class-name. */
22474 /* If we know this is a type-name, there's no need to look it
22475 up. */
22478 else
22479 {
22480 tree ambiguous_decls;
22481 /* If we already know that this lookup is ambiguous, then
22482 we've already issued an error message; there's no reason
22483 to check again. */
22485 {
22488 }
22489 /* If the next token is a `::', then the name must be a type
22490 name.
22492 [basic.lookup.qual]
22494 During the lookup for a name preceding the :: scope
22495 resolution operator, object, function, and enumerator
22496 names are ignored. */
22499 /* Look up the name. */
22501 tag_type,
22504 check_dependency_p,
22508 {
22512 }
22513 }
22514 }
22515 else
22516 {
22517 /* Try a template-id. */
22519 check_dependency_p,
22520 tag_type,
22521 is_declaration);
22524 }
22528 /* If this is a typename, create a TYPENAME_TYPE. */
22530 {
22535 }
22539 /* Check to see that it is really the name of a class. */
22543 /* Situations like this:
22545 template <typename T> struct A {
22546 typename T::template X<int>::I i;
22547 };
22549 are problematic. Is `T::template X<int>' a class-name? The
22550 standard does not seem to be definitive, but there is no other
22551 valid interpretation of the following `::'. Therefore, those
22552 names are considered class-names. */
22553 {
22557 }
22562 /* In Objective-C 2.0, a classname followed by '.' starts a
22563 dot-syntax expression, and it's not a type-name. */
22575 }
22577 /* Parse a class-specifier.
22579 class-specifier:
22580 class-head { member-specification [opt] }
22582 Returns the TREE_TYPE representing the class. */
22584 static tree
22586 {
22587 tree type;
22601 /* Parse the class-head. */
22604 /* If the class-head was a semantic disaster, skip the entire body
22605 of the class. */
22607 {
22611 }
22613 /* Look for the `{'. */
22614 matching_braces braces;
22616 {
22619 }
22624 /* Issue an error message if type-definitions are forbidden here. */
22626 /* Remember that we are defining one more class. */
22628 /* Inside the class, surrounding template-parameter-lists do not
22629 apply. */
22630 saved_num_template_parameter_lists
22633 /* We are not in a function body. */
22636 /* Or in a loop. */
22639 /* Or in a switch. */
22642 /* We are not immediately inside an extern "lang" block. */
22643 saved_in_unbraced_linkage_specification_p
22647 // Associate constraints with the type.
22651 /* Start the class. */
22653 {
22656 }
22660 /* If the type is erroneous, skip the entire body of the class. */
22662 else
22663 /* Parse the member-specification. */
22666 /* Look for the trailing `}'. */
22668 /* Look for trailing attributes to apply to this class. */
22676 /* We've finished a type definition. Check for the common syntax
22677 error of forgetting a semicolon after the definition. We need to
22678 be careful, as we can't just check for not-a-semicolon and be done
22679 with it; the user might have typed:
22681 class X { } c = ...;
22682 class X { } *p = ...;
22684 and so forth. Instead, enumerate all the possible tokens that
22685 might follow this production; if we don't see one of them, then
22686 complain and silently insert the semicolon. */
22687 {
22692 /* Don't try to parse c++11 attributes here. As per the
22693 grammar, that should be a task for
22694 cp_parser_decl_specifier_seq. */
22698 {
22709 /* While it's legal for type qualifiers and storage class
22710 specifiers to follow type definitions in the grammar, only
22711 compiler testsuites contain code like that. Assume that if
22712 we see such code, then what we're really seeing is a case
22713 like:
22715 class X { }
22716 const <type> var = ...;
22718 or
22720 class Y { }
22721 static <type> func (...) ...
22723 i.e. the qualifier or specifier applies to the next
22724 declaration. To do so, however, we need to look ahead one
22725 more token to see if *that* token is a type specifier.
22727 This code could be improved to handle:
22729 class Z { }
22730 static const <type> var = ...; */
22733 {
22736 /* Handling user-defined types here would be nice, but very
22737 tricky. */
22738 want_semicolon
22741 }
22745 }
22747 /* If we don't have a type, then something is very wrong and we
22748 shouldn't try to do anything clever. Likewise for not seeing the
22749 closing brace. */
22751 {
22752 /* Locate the closing brace. */
22753 cp_token_position prev
22758 /* We want to suggest insertion of a ';' immediately *after* the
22759 closing brace, so, if we can, offset the location by 1 column. */
22766 /* If we successfully offset the location, suggest the fix-it. */
22779 else
22782 /* Unget one token and smash it to look as though we encountered
22783 a semicolon in the input stream. */
22788 }
22789 }
22791 /* If this class is not itself within the scope of another class,
22792 then we need to parse the bodies of all of the queued function
22793 definitions. Note that the queued functions defined in a class
22794 are not always processed immediately following the
22795 class-specifier for that class. Consider:
22797 struct A {
22798 struct B { void f() { sizeof (A); } };
22799 };
22801 If `f' were processed before the processing of `A' were
22802 completed, there would be no way to compute the size of `A'.
22803 Note that the nesting we are interested in here is lexical --
22804 not the semantic nesting given by TYPE_CONTEXT. In particular,
22805 for:
22807 struct A { struct B; };
22808 struct A::B { void f() { } };
22810 there is no need to delay the parsing of `A::B::f'. */
22812 {
22813 tree decl;
22821 {
22822 /* Skip default arguments, NSDMIs, etc, in order to improve
22823 error recovery (c++/71169, c++/71832). */
22828 }
22830 /* In a first pass, parse default arguments to the functions.
22831 Then, in a second pass, parse the bodies of the functions.
22832 This two-phased approach handles cases like:
22834 struct S {
22835 void f() { g(); }
22836 void g(int i = 3);
22837 };
22839 */
22841 {
22843 /* If there are default arguments that have not yet been processed,
22844 take care of them now. */
22846 {
22851 }
22852 /* Make sure that any template parameters are in scope. */
22854 /* Parse the default argument expressions. */
22856 /* Remove any template parameters from the symbol table. */
22858 }
22860 /* Now parse any NSDMIs. */
22864 {
22866 {
22871 }
22874 }
22881 /* Now do some post-NSDMI bookkeeping. */
22887 /* Now parse the body of the functions. */
22889 {
22890 /* OpenMP UDRs need to be parsed before all other functions. */
22897 }
22898 else
22902 }
22903 else
22906 /* Put back any saved access checks. */
22909 /* Restore saved state. */
22913 parser->num_template_parameter_lists
22915 parser->in_unbraced_linkage_specification_p
22919 }
22921 static tree
22923 {
22924 tree ret;
22929 }
22931 /* Parse a class-head.
22933 class-head:
22934 class-key identifier [opt] base-clause [opt]
22935 class-key nested-name-specifier identifier class-virt-specifier [opt] base-clause [opt]
22936 class-key nested-name-specifier [opt] template-id
22937 base-clause [opt]
22939 class-virt-specifier:
22940 final
22942 GNU Extensions:
22943 class-key attributes identifier [opt] base-clause [opt]
22944 class-key attributes nested-name-specifier identifier base-clause [opt]
22945 class-key attributes nested-name-specifier [opt] template-id
22946 base-clause [opt]
22948 Upon return BASES is initialized to the list of base classes (or
22949 NULL, if there are none) in the same form returned by
22950 cp_parser_base_clause.
22952 Returns the TYPE of the indicated class. Sets
22953 *NESTED_NAME_SPECIFIER_P to TRUE iff one of the productions
22954 involving a nested-name-specifier was used, and FALSE otherwise.
22956 Returns error_mark_node if this is not a class-head.
22958 Returns NULL_TREE if the class-head is syntactically valid, but
22959 semantically invalid in a way that means we should skip the entire
22960 body of the class. */
22962 static tree
22965 {
22966 tree nested_name_specifier;
22970 tree attributes;
22971 tree bases;
22981 /* Assume no nested-name-specifier will be present. */
22983 /* Assume no template parameter lists will be used in defining the
22984 type. */
22988 /* Look for the class-key. */
22995 /* Parse the attributes. */
22998 /* If the next token is `::', that is invalid -- but sometimes
22999 people do try to write:
23001 struct ::S {};
23003 Handle this gracefully by accepting the extra qualifier, and then
23004 issuing an error about it later if this really is a
23005 class-head. If it turns out just to be an elaborated type
23006 specifier, remain silent. */
23012 /* Determine the name of the class. Begin by looking for an
23013 optional nested-name-specifier. */
23015 nested_name_specifier
23021 /* If there was a nested-name-specifier, then there *must* be an
23022 identifier. */
23027 {
23029 /* Although the grammar says `identifier', it really means
23030 `class-name' or `template-name'. You are only allowed to
23031 define a class that has already been declared with this
23032 syntax.
23034 The proposed resolution for Core Issue 180 says that wherever
23035 you see `class T::X' you should treat `X' as a type-name.
23037 It is OK to define an inaccessible class; for example:
23039 class A { class B; };
23040 class A::B {};
23042 We do not know if we will see a class-name, or a
23043 template-name. We look for a class-name first, in case the
23044 class-name is a template-id; if we looked for the
23045 template-name first we would stop after the template-name. */
23052 class_type,
23056 /* If that didn't work, ignore the nested-name-specifier. */
23058 {
23064 }
23065 /* If we could not find a corresponding TYPE, treat this
23066 declaration like an unqualified declaration. */
23069 /* Otherwise, count the number of templates used in TYPE and its
23070 containing scopes. */
23071 else
23073 }
23074 /* Otherwise, the identifier is optional. */
23075 else
23076 {
23077 /* We don't know whether what comes next is a template-id,
23078 an identifier, or nothing at all. */
23080 /* Check for a template-id. */
23085 class_key,
23087 /* If that didn't work, it could still be an identifier. */
23089 {
23091 {
23094 }
23095 else
23097 }
23098 else
23099 {
23102 }
23103 }
23108 {
23110 class_key,
23112 }
23115 /* If it's not a `:' or a `{' then we can't really be looking at a
23116 class-head, since a class-head only appears as part of a
23117 class-specifier. We have to detect this situation before calling
23118 xref_tag, since that has irreversible side-effects. */
23120 {
23124 }
23126 /* At this point, we're going ahead with the class-specifier, even
23127 if some other problem occurs. */
23130 {
23135 }
23136 /* Issue the error about the overly-qualified name now. */
23138 {
23143 }
23145 {
23150 }
23152 {
23153 tree scope;
23156 /* [temp.names]: in a qualified-id formed by a class-head-name, the
23157 keyword template shall not appear at the top level. */
23161 /* Reject typedef-names in class heads. */
23163 {
23166 type);
23169 }
23171 /* Figure out in what scope the declaration is being placed. */
23173 /* If that scope does not contain the scope in which the
23174 class was originally declared, the program is invalid. */
23176 {
23179 "declaration of %qD in namespace %qD which does not "
23182 else
23188 }
23189 /* [dcl.meaning]
23191 A declarator-id shall not be qualified except for the
23192 definition of a ... nested class outside of its class
23193 ... [or] the definition or explicit instantiation of a
23194 class member of a namespace outside of its namespace. */
23196 {
23201 }
23202 }
23203 /* An explicit-specialization must be preceded by "template <>". If
23204 it is not, try to recover gracefully. */
23207 && !processing_template_parmlist
23209 {
23210 /* Build a location of this form:
23211 struct typename <ARGS>
23212 ^~~~~~~~~~~~~~~~~~~~~~
23213 with caret==start at the start token, and
23214 finishing at the end of the type. */
23215 location_t reported_loc
23217 class_head_start_location,
23223 "an explicit specialization must be preceded by"
23226 /* Take the same action that would have been taken by
23227 cp_parser_explicit_specialization. */
23230 }
23231 /* There must be no "return" statements between this point and the
23232 end of this function; set "type "to the correct return value and
23233 use "goto done;" to return. */
23234 /* Make sure that the right number of template parameters were
23235 present. */
23237 template_id_p,
23240 {
23241 /* If something went wrong, there is no point in even trying to
23242 process the class-definition. */
23245 }
23247 /* Look up the type. */
23249 {
23253 {
23257 }
23258 else
23259 {
23263 /* Check the scope while we still know whether or not we had a
23264 nested-name-specifier. */
23267 }
23270 }
23272 {
23273 tree class_type;
23275 /* Given:
23277 template <typename T> struct S { struct T };
23278 template <typename T> struct S<T>::T { };
23280 we will get a TYPENAME_TYPE when processing the definition of
23281 `S::T'. We need to resolve it to the actual type before we
23282 try to define it. */
23284 {
23289 else
23290 {
23293 }
23294 }
23298 {
23301 }
23304 /* Enter the scope indicated by the nested-name-specifier. */
23306 /* Get the canonical version of this type. */
23308 /* Call push_template_decl if it seems like we should be defining a
23309 template either from the template headers or the type we're
23310 defining, so that we diagnose both extra and missing headers. */
23314 {
23317 {
23320 }
23321 }
23325 }
23327 {
23328 /* If the class was unnamed, create a dummy name. */
23332 ? ts_within_enclosing_non_class
23336 }
23338 /* Indicate whether this class was declared as a `class' or as a
23339 `struct'. */
23344 /* If this type was already complete, and we see another definition,
23345 that's an error. */
23347 {
23349 type);
23351 type);
23354 }
23359 {
23360 /* Apply attributes now, before any use of the class as a template
23361 argument in its base list. */
23364 }
23366 /* We will have entered the scope containing the class; the names of
23367 base classes should be looked up in that context. For example:
23369 struct A { struct B {}; struct C; };
23370 struct A::C : B {};
23372 is valid. */
23374 /* Get the list of base-classes, if there is one. */
23376 {
23377 /* PR59482: enter the class scope so that base-specifiers are looked
23378 up correctly. */
23382 /* PR59482: get out of the previously pushed class scope so that the
23383 subsequent pops pop the right thing. */
23386 }
23387 else
23390 /* If we're really defining a class, process the base classes.
23391 If they're invalid, fail. */
23395 done:
23396 /* Leave the scope given by the nested-name-specifier. We will
23397 enter the class scope itself while processing the members. */
23402 {
23405 }
23411 out:
23414 }
23416 /* Parse a class-key.
23418 class-key:
23419 class
23420 struct
23421 union
23423 Returns the kind of class-key specified, or none_type to indicate
23424 error. */
23426 static enum tag_types
23428 {
23432 /* Look for the class-key. */
23437 /* Check to see if the TOKEN is a class-key. */
23442 }
23444 /* Parse a type-parameter-key.
23446 type-parameter-key:
23447 class
23448 typename
23449 */
23451 static void
23453 {
23454 /* Look for the type-parameter-key. */
23458 {
23461 /* typename is not allowed in a template template parameter
23462 by the standard until C++17. */
23464 "ISO C++ forbids typename key in template template parameter;"
23466 }
23467 else
23471 }
23473 /* Parse an (optional) member-specification.
23475 member-specification:
23476 member-declaration member-specification [opt]
23477 access-specifier : member-specification [opt] */
23479 static void
23481 {
23483 {
23487 /* Peek at the next token. */
23489 /* If it's a `}', or EOF then we've seen all the members. */
23495 /* See if this token is a keyword. */
23498 {
23502 /* Consume the access-specifier. */
23504 /* Remember which access-specifier is active. */
23506 /* Look for the `:'. */
23511 /* Accept #pragmas at class scope. */
23513 {
23516 }
23518 /* Otherwise, the next construction must be a
23519 member-declaration. */
23521 }
23522 }
23523 }
23525 /* Parse a member-declaration.
23527 member-declaration:
23528 decl-specifier-seq [opt] member-declarator-list [opt] ;
23529 function-definition ; [opt]
23530 :: [opt] nested-name-specifier template [opt] unqualified-id ;
23531 using-declaration
23532 template-declaration
23533 alias-declaration
23535 member-declarator-list:
23536 member-declarator
23537 member-declarator-list , member-declarator
23539 member-declarator:
23540 declarator pure-specifier [opt]
23541 declarator constant-initializer [opt]
23542 identifier [opt] : constant-expression
23544 GNU Extensions:
23546 member-declaration:
23547 __extension__ member-declaration
23549 member-declarator:
23550 declarator attributes [opt] pure-specifier [opt]
23551 declarator attributes [opt] constant-initializer [opt]
23552 identifier [opt] attributes [opt] : constant-expression
23554 C++0x Extensions:
23556 member-declaration:
23557 static_assert-declaration */
23559 static void
23561 {
23562 cp_decl_specifier_seq decl_specifiers;
23563 tree prefix_attributes;
23564 tree decl;
23573 /* Check for the `__extension__' keyword. */
23575 {
23576 /* Recurse. */
23578 /* Restore the old value of the PEDANTIC flag. */
23582 }
23584 /* Check for a template-declaration. */
23586 {
23587 /* An explicit specialization here is an error condition, and we
23588 expect the specialization handler to detect and report this. */
23592 else
23596 }
23597 /* Check for a template introduction. */
23601 /* Check for a using-declaration. */
23603 {
23605 {
23606 /* Parse the using-declaration. */
23610 }
23611 else
23612 {
23613 tree decl;
23617 /* Note that if we actually see the '=' token after the
23618 identifier, cp_parser_alias_declaration commits the
23619 tentative parse. In that case, we really expect an
23620 alias-declaration. Otherwise, we expect a using
23621 declaration. */
23622 alias_decl_expected =
23628 else
23632 }
23633 }
23635 /* Check for @defs. */
23637 {
23642 {
23647 }
23649 }
23651 /* If the next token is `static_assert' we have a static assertion. */
23653 {
23656 }
23663 /* Parse the decl-specifier-seq. */
23666 CP_PARSER_FLAGS_OPTIONAL,
23669 /* Check for an invalid type-name. */
23673 /* If there is no declarator, then the decl-specifier-seq should
23674 specify a type. */
23676 {
23677 /* If there was no decl-specifier-seq, and the next token is a
23678 `;', then we have something like:
23680 struct S { ; };
23682 [class.mem]
23684 Each member-declaration shall declare at least one member
23685 name of the class. */
23687 {
23690 {
23694 }
23695 }
23696 else
23697 {
23698 tree type;
23700 /* See if this declaration is a friend. */
23702 /* If there were decl-specifiers, check to see if there was
23703 a class-declaration. */
23706 /* Nested classes have already been added to the class, but
23707 a `friend' needs to be explicitly registered. */
23709 {
23710 /* If the `friend' keyword was present, the friend must
23711 be introduced with a class-key. */
23714 "in C++03 a class-key must be used "
23716 /* In this case:
23718 template <typename T> struct A {
23719 friend struct A<T>::B;
23720 };
23722 A<T>::B will be represented by a TYPENAME_TYPE, and
23723 therefore not recognized by check_tag_decl. */
23725 {
23729 }
23732 "friend declaration does not name a class or "
23734 else
23737 }
23738 /* If there is no TYPE, an error message will already have
23739 been issued. */
23741 ;
23742 /* An anonymous aggregate has to be handled specially; such
23743 a declaration really declares a data member (with a
23744 particular type), as opposed to a nested class. */
23746 {
23747 /* C++11 9.5/6. */
23750 "a storage class on an anonymous aggregate "
23753 /* Remove constructors and such from TYPE, now that we
23754 know it is an anonymous aggregate. */
23756 /* And make the corresponding data member. */
23759 /* Add it to the class. */
23761 }
23762 else
23763 cp_parser_check_access_in_redeclaration
23766 }
23767 }
23768 else
23769 {
23772 /* Clear attributes from the decl_specifiers but keep them
23773 around as prefix attributes that apply them to the entity
23774 being declared. */
23778 /* See if these declarations will be friends. */
23781 /* Keep going until we hit the `;' at the end of the
23782 declaration. */
23784 {
23786 tree first_attribute;
23787 tree initializer;
23790 /* Peek at the next token. */
23793 /* The following code wants to know early if it is a bit-field
23794 or some other declaration. Attributes can appear before
23795 the `:' token. Skip over them without consuming any tokens
23796 to peek if they are followed by `:'. */
23801 {
23802 size_t n
23805 }
23807 /* Check for a bitfield declaration. */
23813 {
23814 tree identifier;
23815 tree width;
23820 else
23823 /* Look for attributes that apply to the bitfield. */
23826 /* Consume the `:' token. */
23829 /* Get the width of the bitfield. */
23833 /* In C++2A and as extension for C++11 and above we allow
23834 default member initializers for bit-fields. */
23839 CPP_OPEN_BRACE)))
23840 {
23841 location_t loc
23847 "default member initializers for bit-fields "
23848 "only available with -std=c++2a or "
23853 {
23857 }
23858 }
23859 else
23860 {
23861 /* Look for attributes that apply to the bitfield after
23862 the `:' token and width. This is where GCC used to
23863 parse attributes in the past, pedwarn if there is
23864 a std attribute. */
23867 "ISO C++ allows bit-field attributes only "
23871 }
23875 /* Remember which attributes are prefix attributes and
23876 which are not. */
23878 /* Combine the attributes. */
23881 /* Create the bitfield declaration. */
23884 identifier,
23885 sfk_none)
23889 attributes);
23890 }
23891 else
23892 {
23894 tree asm_specification;
23897 /* Parse the declarator. */
23898 declarator
23903 friend_p);
23905 /* If something went wrong parsing the declarator, make sure
23906 that we at least consume some tokens. */
23908 {
23909 /* Skip to the end of the statement. */
23911 /* If the next token is not a semicolon, that is
23912 probably because we just skipped over the body of
23913 a function. So, we consume a semicolon if
23914 present, but do not issue an error message if it
23915 is not present. */
23917 CPP_SEMICOLON))
23920 }
23923 cp_parser_check_for_definition_in_return_type
23927 /* Look for an asm-specification. */
23929 /* Look for attributes that apply to the declaration. */
23931 /* Remember which attributes are prefix attributes and
23932 which are not. */
23934 /* Combine the attributes. */
23937 /* If it's an `=', then we have a constant-initializer or a
23938 pure-specifier. It is not correct to parse the
23939 initializer before registering the member declaration
23940 since the member declaration should be in scope while
23941 its initializer is processed. However, the rest of the
23942 front end does not yet provide an interface that allows
23943 us to handle this correctly. */
23945 {
23946 /* In [class.mem]:
23948 A pure-specifier shall be used only in the declaration of
23949 a virtual function.
23951 A member-declarator can contain a constant-initializer
23952 only if it declares a static member of integral or
23953 enumeration type.
23955 Therefore, if the DECLARATOR is for a function, we look
23956 for a pure-specifier; otherwise, we look for a
23957 constant-initializer. When we call `grokfield', it will
23958 perform more stringent semantics checks. */
23970 {
23972 /* Don't require a constant rvalue in C++11, since we
23973 might want a reference constant. We'll enforce
23974 constancy later. */
23976 /* Parse the initializer. */
23979 }
23980 else
23981 /* Parse the initializer. */
23983 }
23986 {
23990 else
23992 }
23993 /* Otherwise, there is no initializer. */
23994 else
23997 /* See if we are probably looking at a function
23998 definition. We are certainly not looking at a
23999 member-declarator. Calling `grokfield' has
24000 side-effects, so we must not do it unless we are sure
24001 that we are looking at a member-declarator. */
24004 {
24005 /* The grammar does not allow a pure-specifier to be
24006 used when a member function is defined. (It is
24007 possible that this fact is an oversight in the
24008 standard, since a pure function may be defined
24009 outside of the class-specifier. */
24015 declarator,
24016 attributes);
24019 /* If the member was not a friend, declare it here. */
24022 /* Peek at the next token. */
24024 /* If the next token is a semicolon, consume it. */
24026 {
24027 location_t semicolon_loc
24032 "extra %<;%> after in-class "
24034 }
24036 }
24037 else
24040 /* Create the declaration. */
24045 {
24048 else
24050 }
24051 }
24056 /* Reset PREFIX_ATTRIBUTES. */
24058 {
24063 }
24065 /* If there is any qualification still in effect, clear it
24066 now; we will be starting fresh with the next declarator. */
24070 /* If it's a `,', then there are more declarators. */
24072 {
24075 {
24081 }
24082 }
24083 /* If the next token isn't a `;', then we have a parse error. */
24085 CPP_SEMICOLON))
24086 {
24087 /* The next token might be a ways away from where the
24088 actual semicolon is missing. Find the previous token
24089 and use that for our error position. */
24096 /* Assume that the user meant to provide a semicolon. If
24097 we were to cp_parser_skip_to_end_of_statement, we might
24098 skip to a semicolon inside a member function definition
24099 and issue nonsensical error messages. */
24101 }
24104 {
24105 /* Add DECL to the list of members. */
24107 /* Explicitly include, eg, NSDMIs, for better error
24108 recovery (c++/58650). */
24116 /* Add DECL to the queue of NSDMI to be parsed later. */
24118 }
24122 }
24123 }
24126 out:
24128 }
24130 /* Parse a pure-specifier.
24132 pure-specifier:
24133 = 0
24135 Returns INTEGER_ZERO_NODE if a pure specifier is found.
24136 Otherwise, ERROR_MARK_NODE is returned. */
24138 static tree
24140 {
24143 /* Look for the `=' token. */
24146 /* Look for the `0' token. */
24155 /* Accept = default or = delete in c++0x mode. */
24158 {
24161 }
24163 /* c_lex_with_flags marks a single digit '0' with PURE_ZERO. */
24165 {
24170 }
24172 {
24175 }
24178 }
24180 /* Parse a constant-initializer.
24182 constant-initializer:
24183 = constant-expression
24185 Returns a representation of the constant-expression. */
24187 static tree
24189 {
24190 /* Look for the `=' token. */
24194 /* It is invalid to write:
24196 struct S { static const int i = { 7 }; };
24198 */
24200 {
24203 /* Consume the opening brace. */
24204 matching_braces braces;
24206 /* Skip the initializer. */
24208 /* Look for the trailing `}'. */
24212 }
24215 }
24217 /* Derived classes [gram.class.derived] */
24219 /* Parse a base-clause.
24221 base-clause:
24222 : base-specifier-list
24224 base-specifier-list:
24225 base-specifier ... [opt]
24226 base-specifier-list , base-specifier ... [opt]
24228 Returns a TREE_LIST representing the base-classes, in the order in
24229 which they were declared. The representation of each node is as
24230 described by cp_parser_base_specifier.
24232 In the case that no bases are specified, this function will return
24233 NULL_TREE, not ERROR_MARK_NODE. */
24235 static tree
24237 {
24240 /* Look for the `:' that begins the list. */
24243 /* Scan the base-specifier-list. */
24245 {
24247 tree base;
24250 /* Look for the base-specifier. */
24252 /* Look for the (optional) ellipsis. */
24254 {
24255 /* Consume the `...'. */
24259 }
24261 /* Add BASE to the front of the list. */
24263 {
24265 /* Make this a pack expansion type. */
24269 {
24272 }
24273 }
24274 /* Peek at the next token. */
24276 /* If it's not a comma, then the list is complete. */
24279 /* Consume the `,'. */
24281 }
24283 /* PARSER->SCOPE may still be non-NULL at this point, if the last
24284 base class had a qualified name. However, the next name that
24285 appears is certainly not qualified. */
24291 }
24293 /* Parse a base-specifier.
24295 base-specifier:
24296 :: [opt] nested-name-specifier [opt] class-name
24297 virtual access-specifier [opt] :: [opt] nested-name-specifier
24298 [opt] class-name
24299 access-specifier virtual [opt] :: [opt] nested-name-specifier
24300 [opt] class-name
24302 Returns a TREE_LIST. The TREE_PURPOSE will be one of
24303 ACCESS_{DEFAULT,PUBLIC,PROTECTED,PRIVATE}_[VIRTUAL]_NODE to
24304 indicate the specifiers provided. The TREE_VALUE will be a TYPE
24305 (or the ERROR_MARK_NODE) indicating the type that was specified. */
24307 static tree
24309 {
24317 tree type;
24319 /* Process the optional `virtual' and `access-specifier'. */
24321 {
24322 /* Peek at the next token. */
24324 /* Process `virtual'. */
24326 {
24328 /* If `virtual' appears more than once, issue an error. */
24330 {
24334 }
24338 /* Consume the `virtual' token. */
24346 /* If more than one access specifier appears, issue an
24347 error. */
24350 {
24354 }
24358 /* Consume the access-specifier. */
24366 }
24367 }
24368 /* It is not uncommon to see programs mechanically, erroneously, use
24369 the 'typename' keyword to denote (dependent) qualified types
24370 as base classes. */
24372 {
24377 else
24379 "keyword %<typename%> not allowed in this context "
24382 }
24384 /* Look for the optional `::' operator. */
24386 /* Look for the nested-name-specifier. The simplest way to
24387 implement:
24389 [temp.res]
24391 The keyword `typename' is not permitted in a base-specifier or
24392 mem-initializer; in these contexts a qualified name that
24393 depends on a template-parameter is implicitly assumed to be a
24394 type name.
24396 is to pretend that we have seen the `typename' keyword at this
24397 point. */
24403 /* If the base class is given by a qualified name, assume that names
24404 we see are type names or templates, as appropriate. */
24410 /* DR 950 allows decltype as a base-specifier. */
24412 else
24413 {
24414 /* Otherwise, look for the class-name. */
24416 class_scope_p,
24417 template_p,
24418 typename_type,
24423 }
24429 }
24431 /* Exception handling [gram.exception] */
24433 /* Parse an (optional) noexcept-specification.
24435 noexcept-specification:
24436 noexcept ( constant-expression ) [opt]
24438 If no noexcept-specification is present, returns NULL_TREE.
24439 Otherwise, if REQUIRE_CONSTEXPR is false, then either parse and return any
24440 expression if parentheses follow noexcept, or return BOOLEAN_TRUE_NODE if
24441 there are no parentheses. CONSUMED_EXPR will be set accordingly.
24442 Otherwise, returns a noexcept specification unless RETURN_COND is true,
24443 in which case a boolean condition is returned instead. */
24445 static tree
24450 {
24454 /* Peek at the next token. */
24457 /* Is it a noexcept-specification? */
24459 {
24460 tree expr;
24464 {
24465 matching_parens parens;
24469 {
24470 /* Types may not be defined in an exception-specification. */
24472 parser->type_definition_forbidden_message
24477 /* Restore the saved message. */
24479 }
24480 else
24481 {
24484 }
24487 }
24488 else
24489 {
24493 }
24495 /* We cannot build a noexcept-spec right away because this will check
24496 that expr is a constexpr. */
24499 else
24501 }
24502 else
24504 }
24506 /* Parse an (optional) exception-specification.
24508 exception-specification:
24509 throw ( type-id-list [opt] )
24511 Returns a TREE_LIST representing the exception-specification. The
24512 TREE_VALUE of each node is a type. */
24514 static tree
24516 {
24518 tree type_id_list;
24521 /* Peek at the next token. */
24524 /* Is it a noexcept-specification? */
24530 /* If it's not `throw', then there's no exception-specification. */
24536 /* Consume the `throw'. */
24539 /* Look for the `('. */
24540 matching_parens parens;
24543 /* Peek at the next token. */
24545 /* If it's not a `)', then there is a type-id-list. */
24547 {
24548 /* Types may not be defined in an exception-specification. */
24550 parser->type_definition_forbidden_message
24552 /* Parse the type-id-list. */
24554 /* Restore the saved message. */
24558 {
24562 }
24565 "dynamic exception specifications are deprecated in "
24567 }
24568 /* In C++17, throw() is equivalent to noexcept (true). throw()
24569 is deprecated in C++11 and above as well, but is still widely used,
24570 so don't warn about it yet. */
24573 else
24576 /* Look for the `)'. */
24580 }
24582 /* Parse an (optional) type-id-list.
24584 type-id-list:
24585 type-id ... [opt]
24586 type-id-list , type-id ... [opt]
24588 Returns a TREE_LIST. The TREE_VALUE of each node is a TYPE,
24589 in the order that the types were presented. */
24591 static tree
24593 {
24597 {
24599 tree type;
24603 /* Get the next type-id. */
24605 /* Check for invalid 'auto'. */
24607 {
24611 }
24612 /* Parse the optional ellipsis. */
24614 {
24615 /* Consume the `...'. */
24618 /* Turn the type into a pack expansion expression. */
24620 }
24621 /* Add it to the list. */
24623 /* Peek at the next token. */
24625 /* If it is not a `,', we are done. */
24628 /* Consume the `,'. */
24630 }
24633 }
24635 /* Parse a try-block.
24637 try-block:
24638 try compound-statement handler-seq */
24640 static tree
24642 {
24643 tree try_block;
24657 }
24659 /* Parse a function-try-block.
24661 function-try-block:
24662 try ctor-initializer [opt] function-body handler-seq */
24664 static void
24666 {
24667 tree compound_stmt;
24668 tree try_block;
24670 /* Look for the `try' keyword. */
24673 /* Let the rest of the front end know where we are. */
24675 /* Parse the function-body. */
24676 cp_parser_ctor_initializer_opt_and_function_body
24678 /* We're done with the `try' part. */
24680 /* Parse the handlers. */
24682 /* We're done with the handlers. */
24684 }
24686 /* Parse a handler-seq.
24688 handler-seq:
24689 handler handler-seq [opt] */
24691 static void
24693 {
24695 {
24698 /* Parse the handler. */
24700 /* Peek at the next token. */
24702 /* If it's not `catch' then there are no more handlers. */
24705 }
24706 }
24708 /* Parse a handler.
24710 handler:
24711 catch ( exception-declaration ) compound-statement */
24713 static void
24715 {
24716 tree handler;
24717 tree declaration;
24721 matching_parens parens;
24728 }
24730 /* Parse an exception-declaration.
24732 exception-declaration:
24733 type-specifier-seq declarator
24734 type-specifier-seq abstract-declarator
24735 type-specifier-seq
24736 ...
24738 Returns a VAR_DECL for the declaration, or NULL_TREE if the
24739 ellipsis variant is used. */
24741 static tree
24743 {
24744 cp_decl_specifier_seq type_specifiers;
24748 /* If it's an ellipsis, it's easy to handle. */
24750 {
24751 /* Consume the `...' token. */
24754 }
24756 /* Types may not be defined in exception-declarations. */
24758 parser->type_definition_forbidden_message
24761 /* Parse the type-specifier-seq. */
24765 /* If it's a `)', then there is no declarator. */
24768 else
24775 /* Restore the saved message. */
24782 }
24784 /* Parse a throw-expression.
24786 throw-expression:
24787 throw assignment-expression [opt]
24789 Returns a THROW_EXPR representing the throw-expression. */
24791 static tree
24793 {
24794 tree expression;
24799 /* Figure out whether or not there is an assignment-expression
24800 following the "throw" keyword. */
24808 else
24812 }
24814 /* GNU Extensions */
24816 /* Parse an (optional) asm-specification.
24818 asm-specification:
24819 asm ( string-literal )
24821 If the asm-specification is present, returns a STRING_CST
24822 corresponding to the string-literal. Otherwise, returns
24823 NULL_TREE. */
24825 static tree
24827 {
24829 tree asm_specification;
24831 /* Peek at the next token. */
24833 /* If the next token isn't the `asm' keyword, then there's no
24834 asm-specification. */
24838 /* Consume the `asm' token. */
24840 /* Look for the `('. */
24841 matching_parens parens;
24844 /* Look for the string-literal. */
24847 /* Look for the `)'. */
24851 }
24853 /* Parse an asm-operand-list.
24855 asm-operand-list:
24856 asm-operand
24857 asm-operand-list , asm-operand
24859 asm-operand:
24860 string-literal ( expression )
24861 [ string-literal ] string-literal ( expression )
24863 Returns a TREE_LIST representing the operands. The TREE_VALUE of
24864 each node is the expression. The TREE_PURPOSE is itself a
24865 TREE_LIST whose TREE_PURPOSE is a STRING_CST for the bracketed
24866 string-literal (or NULL_TREE if not present) and whose TREE_VALUE
24867 is a STRING_CST for the string literal before the parenthesis. Returns
24868 ERROR_MARK_NODE if any of the operands are invalid. */
24870 static tree
24872 {
24877 {
24878 tree string_literal;
24879 tree expression;
24880 tree name;
24883 {
24884 /* Consume the `[' token. */
24886 /* Read the operand name. */
24891 /* Look for the closing `]'. */
24893 }
24894 else
24896 /* Look for the string-literal. */
24899 /* Look for the `('. */
24900 matching_parens parens;
24902 /* Parse the expression. */
24904 /* Look for the `)'. */
24912 /* Add this operand to the list. */
24914 expression,
24915 asm_operands);
24916 /* If the next token is not a `,', there are no more
24917 operands. */
24920 /* Consume the `,'. */
24922 }
24925 }
24927 /* Parse an asm-clobber-list.
24929 asm-clobber-list:
24930 string-literal
24931 asm-clobber-list , string-literal
24933 Returns a TREE_LIST, indicating the clobbers in the order that they
24934 appeared. The TREE_VALUE of each node is a STRING_CST. */
24936 static tree
24938 {
24942 {
24943 tree string_literal;
24945 /* Look for the string literal. */
24947 /* Add it to the list. */
24949 /* If the next token is not a `,', then the list is
24950 complete. */
24953 /* Consume the `,' token. */
24955 }
24958 }
24960 /* Parse an asm-label-list.
24962 asm-label-list:
24963 identifier
24964 asm-label-list , identifier
24966 Returns a TREE_LIST, indicating the labels in the order that they
24967 appeared. The TREE_VALUE of each node is a label. */
24969 static tree
24971 {
24975 {
24978 /* Look for the identifier. */
24981 {
24984 {
24990 }
24991 }
24992 /* If the next token is not a `,', then the list is
24993 complete. */
24996 /* Consume the `,' token. */
24998 }
25001 }
25003 /* Return TRUE iff the next tokens in the stream are possibly the
25004 beginning of a GNU extension attribute. */
25006 static bool
25008 {
25010 }
25012 /* Return TRUE iff the next tokens in the stream are possibly the
25013 beginning of a standard C++-11 attribute specifier. */
25015 static bool
25017 {
25019 }
25021 /* Return TRUE iff the next Nth tokens in the stream are possibly the
25022 beginning of a standard C++-11 attribute specifier. */
25024 static bool
25026 {
25034 }
25036 /* Return TRUE iff the next Nth tokens in the stream are possibly the
25037 beginning of a GNU extension attribute. */
25039 static bool
25041 {
25045 }
25047 /* Return true iff the next tokens can be the beginning of either a
25048 GNU attribute list, or a standard C++11 attribute sequence. */
25050 static bool
25052 {
25055 }
25057 /* Return true iff the next Nth tokens can be the beginning of either
25058 a GNU attribute list, or a standard C++11 attribute sequence. */
25060 static bool
25062 {
25065 }
25067 /* Parse either a standard C++-11 attribute-specifier-seq, or a series
25068 of GNU attributes, or return NULL. */
25070 static tree
25072 {
25076 }
25078 /* Parse an (optional) series of attributes.
25080 attributes:
25081 attributes attribute
25083 attribute:
25084 __attribute__ (( attribute-list [opt] ))
25086 The return value is as for cp_parser_gnu_attribute_list. */
25088 static tree
25090 {
25097 {
25099 tree attribute_list;
25102 /* Peek at the next token. */
25104 /* If it's not `__attribute__', then we're done. */
25108 /* Consume the `__attribute__' keyword. */
25110 /* Look for the two `(' tokens. */
25111 matching_parens outer_parens;
25113 matching_parens inner_parens;
25116 /* Peek at the next token. */
25119 /* Parse the attribute-list. */
25121 else
25122 /* If the next token is a `)', then there is no attribute
25123 list. */
25126 /* Look for the two `)' tokens. */
25134 /* Add these new attributes to the list. */
25136 }
25139 }
25141 /* Parse a GNU attribute-list.
25143 attribute-list:
25144 attribute
25145 attribute-list , attribute
25147 attribute:
25148 identifier
25149 identifier ( identifier )
25150 identifier ( identifier , expression-list )
25151 identifier ( expression-list )
25153 Returns a TREE_LIST, or NULL_TREE on error. Each node corresponds
25154 to an attribute. The TREE_PURPOSE of each node is the identifier
25155 indicating which attribute is in use. The TREE_VALUE represents
25156 the arguments, if any. */
25158 static tree
25160 {
25166 {
25168 tree identifier;
25169 tree attribute;
25171 /* Look for the identifier. We also allow keywords here; for
25172 example `__attribute__ ((const))' is legal. */
25176 {
25179 /* Consume the token, but save it since we need it for the
25180 SIMD enabled function parsing. */
25183 /* Save away the identifier that indicates which attribute
25184 this is. */
25186 /* For keywords, use the canonical spelling, not the
25187 parsed identifier. */
25194 /* Peek at the next token. */
25196 /* If it's an `(', then parse the attribute arguments. */
25198 {
25202 vec = cp_parser_parenthesized_expression_list
25208 else
25209 {
25212 }
25213 /* Save the arguments away. */
25215 }
25218 {
25219 /* Add this attribute to the list. */
25222 }
25225 }
25226 /* Now, look for more attributes. If the next token isn't a
25227 `,', we're done. */
25231 /* Consume the comma and keep going. */
25233 }
25236 /* We built up the list in reverse order. */
25238 }
25240 /* Parse a standard C++11 attribute.
25242 The returned representation is a TREE_LIST which TREE_PURPOSE is
25243 the scoped name of the attribute, and the TREE_VALUE is its
25244 arguments list.
25246 Note that the scoped name of the attribute is itself a TREE_LIST
25247 which TREE_PURPOSE is the namespace of the attribute, and
25248 TREE_VALUE its name. This is unlike a GNU attribute -- as parsed
25249 by cp_parser_gnu_attribute_list -- that doesn't have any namespace
25250 and which TREE_PURPOSE is directly the attribute name.
25252 Clients of the attribute code should use get_attribute_namespace
25253 and get_attribute_name to get the actual namespace and name of
25254 attributes, regardless of their being GNU or C++11 attributes.
25256 attribute:
25257 attribute-token attribute-argument-clause [opt]
25259 attribute-token:
25260 identifier
25261 attribute-scoped-token
25263 attribute-scoped-token:
25264 attribute-namespace :: identifier
25266 attribute-namespace:
25267 identifier
25269 attribute-argument-clause:
25270 ( balanced-token-seq )
25272 balanced-token-seq:
25273 balanced-token [opt]
25274 balanced-token-seq balanced-token
25276 balanced-token:
25277 ( balanced-token-seq )
25278 [ balanced-token-seq ]
25279 { balanced-token-seq }. */
25281 static tree
25283 {
25290 /* First, parse name of the attribute, a.k.a attribute-token. */
25307 {
25308 /* We are seeing a scoped attribute token. */
25323 else
25324 {
25328 }
25332 NULL_TREE);
25334 }
25337 NULL_TREE);
25338 else
25339 {
25342 NULL_TREE);
25343 /* C++11 noreturn attribute is equivalent to GNU's. */
25346 /* C++14 deprecated attribute is equivalent to GNU's. */
25349 /* C++17 fallthrough attribute is equivalent to GNU's. */
25352 /* Transactional Memory TS optimize_for_synchronized attribute is
25353 equivalent to GNU transaction_callable. */
25357 /* Transactional Memory attributes are GNU attributes. */
25360 }
25362 /* Now parse the optional argument clause of the attribute. */
25367 {
25373 /* A GNU attribute that takes an identifier in parameter. */
25376 vec = cp_parser_parenthesized_expression_list
25382 else
25383 {
25386 }
25390 else
25392 }
25395 }
25397 /* Check that the attribute ATTRIBUTE appears at most once in the
25398 attribute-list ATTRIBUTES. This is enforced for noreturn (7.6.3)
25399 and deprecated (7.6.5). Note that carries_dependency (7.6.4)
25400 isn't implemented yet in GCC. */
25402 static void
25404 {
25406 {
25416 }
25417 }
25419 /* Parse a list of standard C++-11 attributes.
25421 attribute-list:
25422 attribute [opt]
25423 attribute-list , attribute[opt]
25424 attribute ...
25425 attribute-list , attribute ...
25426 */
25428 static tree
25430 {
25435 {
25440 {
25444 }
25447 {
25452 else
25453 {
25458 }
25460 }
25464 }
25467 }
25469 /* Parse a standard C++-11 attribute specifier.
25471 attribute-specifier:
25472 [ [ attribute-using-prefix [opt] attribute-list ] ]
25473 alignment-specifier
25475 attribute-using-prefix:
25476 using attribute-namespace :
25478 alignment-specifier:
25479 alignas ( type-id ... [opt] )
25480 alignas ( alignment-expression ... [opt] ). */
25482 static tree
25484 {
25490 {
25497 {
25508 {
25512 "attribute using prefix only available "
25518 }
25519 else
25521 }
25528 else
25529 /* Warn about parsing c++11 attribute in non-c++1 mode, only
25530 when we are sure that we have actually parsed them. */
25532 }
25533 else
25534 {
25535 tree alignas_expr;
25537 /* Look for an alignment-specifier. */
25548 matching_parens parens;
25556 {
25563 }
25568 /* Handle alignas (pack...). */
25570 {
25573 }
25575 /* Something went wrong, so don't build the attribute. */
25582 /* Build the C++-11 representation of an 'aligned'
25583 attribute. */
25584 attributes
25587 }
25590 }
25592 /* Parse a standard C++-11 attribute-specifier-seq.
25594 attribute-specifier-seq:
25595 attribute-specifier-seq [opt] attribute-specifier
25596 */
25598 static tree
25600 {
25605 {
25614 else
25617 }
25620 }
25622 /* Skip a balanced-token starting at Nth token (with 1 as the next token),
25623 return index of the first token after balanced-token, or N on failure. */
25625 static size_t
25627 {
25630 do
25632 {
25635 /* Ran out of tokens. */
25657 }
25660 }
25662 /* Skip GNU attribute tokens starting at Nth token (with 1 as the next token),
25663 return index of the first token after the GNU attribute tokens, or N on
25664 failure. */
25666 static size_t
25668 {
25670 {
25682 }
25684 }
25686 /* Skip standard C++11 attribute tokens starting at Nth token (with 1 as the
25687 next token), return index of the first token after the standard C++11
25688 attribute tokens, or N on failure. */
25690 static size_t
25692 {
25694 {
25697 {
25704 }
25707 {
25712 }
25713 else
25715 }
25717 }
25719 /* Skip standard C++11 or GNU attribute tokens starting at Nth token (with 1
25720 as the next token), return index of the first token after the attribute
25721 tokens, or N on failure. */
25723 static size_t
25725 {
25729 }
25731 /* Parse an optional `__extension__' keyword. Returns TRUE if it is
25732 present, and FALSE otherwise. *SAVED_PEDANTIC is set to the
25733 current value of the PEDANTIC flag, regardless of whether or not
25734 the `__extension__' keyword is present. The caller is responsible
25735 for restoring the value of the PEDANTIC flag. */
25737 static bool
25739 {
25740 /* Save the old value of the PEDANTIC flag. */
25744 {
25745 /* Consume the `__extension__' token. */
25747 /* We're not being pedantic while the `__extension__' keyword is
25748 in effect. */
25752 }
25755 }
25757 /* Parse a label declaration.
25759 label-declaration:
25760 __label__ label-declarator-seq ;
25762 label-declarator-seq:
25763 identifier , label-declarator-seq
25764 identifier */
25766 static void
25768 {
25769 /* Look for the `__label__' keyword. */
25773 {
25774 tree identifier;
25776 /* Look for an identifier. */
25778 /* If we failed, stop. */
25781 /* Declare it as a label. */
25783 /* If the next token is a `;', stop. */
25786 /* Look for the `,' separating the label declarations. */
25788 }
25790 /* Look for the final `;'. */
25792 }
25794 // -------------------------------------------------------------------------- //
25795 // Requires Clause
25797 // Parse a requires clause.
25798 //
25799 // requires-clause:
25800 // 'requires' logical-or-expression
25801 //
25802 // The required logical-or-expression must be a constant expression. Note
25803 // that we don't check that the expression is constepxr here. We defer until
25804 // we analyze constraints and then, we only check atomic constraints.
25805 static tree
25807 {
25808 // Parse the requires clause so that it is not automatically folded.
25816 }
25818 // Optionally parse a requires clause:
25819 static tree
25821 {
25824 {
25827 {
25830 /* Parse and discard the requires-clause. */
25833 }
25835 }
25838 }
25841 /*---------------------------------------------------------------------------
25842 Requires expressions
25843 ---------------------------------------------------------------------------*/
25845 /* Parse a requires expression
25847 requirement-expression:
25848 'requires' requirement-parameter-list [opt] requirement-body */
25849 static tree
25851 {
25855 /* A requires-expression shall appear only within a concept
25856 definition or a requires-clause.
25858 TODO: Implement this diagnostic correctly. */
25860 {
25864 }
25867 {
25868 /* Local parameters are delared as variables within the scope
25869 of the expression. They are not visible past the end of
25870 the expression. Expressions within the requires-expression
25871 are unevaluated. */
25872 struct scope_sentinel
25873 {
25875 {
25878 }
25881 {
25884 }
25887 /* Parse the optional parameter list. */
25889 {
25893 }
25894 else
25897 /* Parse the requirement body. */
25901 }
25903 /* This needs to happen after pop_bindings_and_leave_scope, as it reverses
25904 the parm chain. */
25907 }
25909 /* Parse a parameterized requirement.
25911 requirement-parameter-list:
25912 '(' parameter-declaration-clause ')' */
25913 static tree
25915 {
25916 matching_parens parens;
25926 }
25928 /* Parse the body of a requirement.
25930 requirement-body:
25931 '{' requirement-list '}' */
25932 static tree
25934 {
25935 matching_braces braces;
25945 }
25947 /* Parse a list of requirements.
25949 requirement-list:
25950 requirement
25951 requirement-list ';' requirement[opt] */
25952 static tree
25954 {
25957 {
25964 /* If we see a semi-colon, consume it. */
25968 /* Stop processing at the end of the list. */
25971 }
25973 /* Reverse the order of requirements so they are analyzed in
25974 declaration order. */
25976 }
25978 /* Parse a syntactic requirement or type requirement.
25980 requirement:
25981 simple-requirement
25982 compound-requirement
25983 type-requirement
25984 nested-requirement */
25985 static tree
25987 {
25994 else
25996 }
25998 /* Parse a simple requirement.
26000 simple-requirement:
26001 expression ';' */
26002 static tree
26004 {
26013 }
26015 /* Parse a type requirement
26017 type-requirement
26018 nested-name-specifier [opt] required-type-name ';'
26020 required-type-name:
26021 type-name
26022 'template' [opt] simple-template-id */
26023 static tree
26025 {
26028 // Save the scope before parsing name specifiers.
26039 tree type;
26041 {
26050 }
26051 else
26070 }
26072 /* Parse a compound requirement
26074 compound-requirement:
26075 '{' expression '}' 'noexcept' [opt] trailing-return-type [opt] ';' */
26076 static tree
26078 {
26079 /* Parse an expression enclosed in '{ }'s. */
26080 matching_braces braces;
26091 /* Parse the optional noexcept. */
26094 {
26097 }
26099 /* Parse the optional trailing return type. */
26102 {
26110 }
26113 }
26115 /* Parse a nested requirement. This is the same as a requires clause.
26117 nested-requirement:
26118 requires-clause */
26119 static tree
26121 {
26127 }
26129 /* Support Functions */
26131 /* Return the appropriate prefer_type argument for lookup_name_real based on
26132 tag_type and template_mem_access. */
26136 {
26137 /* DR 141: When looking in the current enclosing context for a template-name
26138 after -> or ., only consider class templates. */
26142 {
26146 }
26147 }
26149 /* Looks up NAME in the current scope, as given by PARSER->SCOPE.
26150 NAME should have one of the representations used for an
26151 id-expression. If NAME is the ERROR_MARK_NODE, the ERROR_MARK_NODE
26152 is returned. If PARSER->SCOPE is a dependent type, then a
26153 SCOPE_REF is returned.
26155 If NAME is a TEMPLATE_ID_EXPR, then it will be immediately
26156 returned; the name was already resolved when the TEMPLATE_ID_EXPR
26157 was formed. Abstractly, such entities should not be passed to this
26158 function, because they do not need to be looked up, but it is
26159 simpler to check for this special case here, rather than at the
26160 call-sites.
26162 In cases not explicitly covered above, this function returns a
26163 DECL, OVERLOAD, or baselink representing the result of the lookup.
26164 If there was no entity with the indicated NAME, the ERROR_MARK_NODE
26165 is returned.
26167 If TAG_TYPE is not NONE_TYPE, it indicates an explicit type keyword
26168 (e.g., "struct") that was used. In that case bindings that do not
26169 refer to types are ignored.
26171 If IS_TEMPLATE is TRUE, bindings that do not refer to templates are
26172 ignored.
26174 If IS_NAMESPACE is TRUE, bindings that do not refer to namespaces
26175 are ignored.
26177 If CHECK_DEPENDENCY is TRUE, names are not looked up in dependent
26178 types.
26180 If AMBIGUOUS_DECLS is non-NULL, *AMBIGUOUS_DECLS is set to a
26181 TREE_LIST of candidates if name-lookup results in an ambiguity, and
26182 NULL_TREE otherwise. */
26184 static cp_expr
26191 location_t name_location)
26192 {
26193 tree decl;
26196 /* Assume that the lookup will be unambiguous. */
26200 /* Now that we have looked up the name, the OBJECT_TYPE (if any) is
26201 no longer valid. Note that if we are parsing tentatively, and
26202 the parse fails, OBJECT_TYPE will be automatically restored. */
26208 /* A template-id has already been resolved; there is no lookup to
26209 do. */
26213 {
26217 }
26219 /* A BIT_NOT_EXPR is used to represent a destructor. By this point,
26220 it should already have been checked to make sure that the name
26221 used matches the type being destroyed. */
26223 {
26224 tree type;
26226 /* Figure out to which type this destructor applies. */
26231 else
26233 /* If that's not a class type, there is no destructor. */
26244 }
26246 /* By this point, the NAME should be an ordinary identifier. If
26247 the id-expression was a qualified name, the qualifying scope is
26248 stored in PARSER->SCOPE at this point. */
26251 /* Perform the lookup. */
26253 {
26259 /* If the SCOPE is dependent, the lookup must be deferred until
26260 the template is instantiated -- unless we are explicitly
26261 looking up names in uninstantiated templates. Even then, we
26262 cannot look up the name if the scope is not a class type; it
26263 might, for example, be a template type parameter. */
26268 /* Defer lookup. */
26270 else
26271 {
26274 /* If PARSER->SCOPE is a dependent type, then it must be a
26275 class type, and we must not be checking dependencies;
26276 otherwise, we would have processed this lookup above. So
26277 that PARSER->SCOPE is not considered a dependent base by
26278 lookup_member, we must enter the scope here. */
26282 /* If the PARSER->SCOPE is a template specialization, it
26283 may be instantiated during name lookup. In that case,
26284 errors may be issued. Even if we rollback the current
26285 tentative parse, those errors are valid. */
26290 /* 3.4.3.1: In a lookup in which the constructor is an acceptable
26291 lookup result and the nested-name-specifier nominates a class C:
26292 * if the name specified after the nested-name-specifier, when
26293 looked up in C, is the injected-class-name of C (Clause 9), or
26294 * if the name specified after the nested-name-specifier is the
26295 same as the identifier or the simple-template-id's template-
26296 name in the last component of the nested-name-specifier,
26297 the name is instead considered to name the constructor of
26298 class C. [ Note: for example, the constructor is not an
26299 acceptable lookup result in an elaborated-type-specifier so
26300 the constructor would not be used in place of the
26301 injected-class-name. --end note ] Such a constructor name
26302 shall be used only in the declarator-id of a declaration that
26303 names a constructor or in a using-declaration. */
26311 /* If we have a single function from a using decl, pull it out. */
26318 }
26320 /* If the scope is a dependent type and either we deferred lookup or
26321 we did lookup but didn't find the name, rememeber the name. */
26324 {
26326 {
26327 tree type;
26329 /* The resolution to Core Issue 180 says that `struct
26330 A::B' should be considered a type-name, even if `A'
26331 is dependent. */
26336 }
26340 CPP_CLOSE_PAREN)))
26344 else
26347 is_template);
26348 }
26351 }
26353 {
26354 /* Look up the name in the scope of the OBJECT_TYPE, unless the
26355 OBJECT_TYPE is not a class. */
26357 /* If the OBJECT_TYPE is a template specialization, it may
26358 be instantiated during name lookup. In that case, errors
26359 may be issued. Even if we rollback the current tentative
26360 parse, those errors are valid. */
26362 name,
26365 tf_warning_or_error);
26366 else
26370 /* Look it up in the enclosing context. DR 141: When looking for a
26371 template-name after -> or ., only consider class templates. */
26376 /* The object is type-dependent, so we can't look anything up; we used
26377 this to get the DR 141 behavior. */
26381 }
26382 else
26383 {
26389 }
26391 /* If the lookup failed, let our caller know. */
26395 /* Pull out the template from an injected-class-name (or multiple). */
26399 /* If it's a TREE_LIST, the result of the lookup was ambiguous. */
26401 {
26404 /* The error message we have to print is too complicated for
26405 cp_parser_error, so we incorporate its actions directly. */
26407 {
26409 name);
26411 }
26413 }
26421 /* If we have resolved the name of a member declaration, check to
26422 see if the declaration is accessible. When the name resolves to
26423 set of overloaded functions, accessibility is checked when
26424 overload resolution is done.
26426 During an explicit instantiation, access is not checked at all,
26427 as per [temp.explicit]. */
26434 }
26436 /* Like cp_parser_lookup_name, but for use in the typical case where
26437 CHECK_ACCESS is TRUE, IS_TYPE is FALSE, IS_TEMPLATE is FALSE,
26438 IS_NAMESPACE is FALSE, and CHECK_DEPENDENCY is TRUE. */
26440 static tree
26442 {
26444 none_type,
26449 location);
26450 }
26452 /* If DECL is a TEMPLATE_DECL that can be treated like a TYPE_DECL in
26453 the current context, return the TYPE_DECL. If TAG_NAME_P is
26454 true, the DECL indicates the class being defined in a class-head,
26455 or declared in an elaborated-type-specifier.
26457 Otherwise, return DECL. */
26459 static tree
26461 {
26462 /* If the TEMPLATE_DECL is being declared as part of a class-head,
26463 the translation from TEMPLATE_DECL to TYPE_DECL occurs:
26465 struct A {
26466 template <typename T> struct B;
26467 };
26469 template <typename T> struct A::B {};
26471 Similarly, in an elaborated-type-specifier:
26473 namespace N { struct X{}; }
26475 struct A {
26476 template <typename T> friend struct N::X;
26477 };
26479 However, if the DECL refers to a class type, and we are in
26480 the scope of the class, then the name lookup automatically
26481 finds the TYPE_DECL created by build_self_reference rather
26482 than a TEMPLATE_DECL. For example, in:
26484 template <class T> struct S {
26485 S s;
26486 };
26488 there is no need to handle such case. */
26494 }
26496 /* If too many, or too few, template-parameter lists apply to the
26497 declarator, issue an error message. Returns TRUE if all went well,
26498 and FALSE otherwise. */
26500 static bool
26503 location_t declarator_location)
26504 {
26506 {
26508 {
26517 {
26518 /* If the DECLARATOR has the form `X<y>' then it uses one
26519 additional level of template parameters. */
26522 }
26524 return cp_parser_check_template_parameters
26526 declarator);
26527 }
26543 }
26545 }
26547 /* NUM_TEMPLATES were used in the current declaration. If that is
26548 invalid, return FALSE and issue an error messages. Otherwise,
26549 return TRUE. If DECLARATOR is non-NULL, then we are checking a
26550 declarator and we can print more accurate diagnostics. */
26552 static bool
26556 location_t location,
26558 {
26559 /* If there are the same number of template classes and parameter
26560 lists, that's OK. */
26563 /* If there are more, but only one more, and the name ends in an identifier,
26564 then we are declaring a primary template. That's OK too. */
26568 /* If there are more template classes than parameter lists, we have
26569 something like:
26571 template <class T> void S<T>::R<T>::f (); */
26573 {
26583 else
26586 }
26587 /* Otherwise, there are too many template parameter lists. We have
26588 something like:
26590 template <class T> template <class U> void S::f(); */
26593 }
26595 /* Parse an optional `::' token indicating that the following name is
26596 from the global namespace. If so, PARSER->SCOPE is set to the
26597 GLOBAL_NAMESPACE. Otherwise, PARSER->SCOPE is set to NULL_TREE,
26598 unless CURRENT_SCOPE_VALID_P is TRUE, in which case it is left alone.
26599 Returns the new value of PARSER->SCOPE, if the `::' token is
26600 present, and NULL_TREE otherwise. */
26602 static tree
26604 {
26607 /* Peek at the next token. */
26609 /* If we're looking at a `::' token then we're starting from the
26610 global namespace, not our current location. */
26612 {
26613 /* Consume the `::' token. */
26615 /* Set the SCOPE so that we know where to start the lookup. */
26621 }
26623 {
26627 }
26630 }
26632 /* Returns TRUE if the upcoming token sequence is the start of a
26633 constructor declarator or C++17 deduction guide. If FRIEND_P is true, the
26634 declarator is preceded by the `friend' specifier. */
26636 static bool
26638 {
26641 tree nested_name_specifier;
26644 /* The common case is that this is not a constructor declarator, so
26645 try to avoid doing lots of work if at all possible. It's not
26646 valid declare a constructor at function scope. */
26649 /* And only certain tokens can begin a constructor declarator. */
26657 /* Parse tentatively; we are going to roll back all of the tokens
26658 consumed here. */
26660 /* Assume that we are looking at a constructor declarator. */
26663 /* Look for the optional `::' operator. */
26666 /* Look for the nested-name-specifier. */
26667 nested_name_specifier
26678 /* Outside of a class-specifier, there must be a
26679 nested-name-specifier. Except in C++17 mode, where we
26680 might be declaring a guiding declaration. */
26687 /* If we have a class scope, this is easy; DR 147 says that S::S always
26688 names the constructor, and no other qualified name could. */
26691 {
26701 }
26702 /* If we still think that this might be a constructor-declarator,
26703 look for a class-name. */
26705 {
26706 /* If we have:
26708 template <typename T> struct S {
26709 S();
26710 };
26712 we must recognize that the nested `S' names a class. */
26716 tree type_decl;
26720 none_type,
26727 {
26733 none_type,
26738 else
26740 }
26742 /* If there was no class-name, then this is not a constructor.
26743 Otherwise, if we are in a class-specifier and we aren't
26744 handling a friend declaration, check that its type matches
26745 current_class_type (c++/38313). Note: error_mark_node
26746 is left alone for error recovery purposes. */
26748 && (outside_class_specifier_p
26754 /* If we're still considering a constructor, we have to see a `(',
26755 to begin the parameter-declaration-clause, followed by either a
26756 `)', an `...', or a decl-specifier. We need to check for a
26757 type-specifier to avoid being fooled into thinking that:
26759 S (f) (int);
26761 is a constructor. (It is actually a function named `f' that
26762 takes one parameter (of type `int') and returns a value of type
26763 `S'. */
26771 /* A parameter declaration begins with a decl-specifier,
26772 which is either the "attribute" keyword, a storage class
26773 specifier, or (usually) a type-specifier. */
26775 {
26776 tree type;
26780 /* Names appearing in the type-specifier should be looked up
26781 in the scope of the class. */
26785 {
26788 {
26792 {
26795 }
26796 }
26798 }
26800 /* Inside the constructor parameter list, surrounding
26801 template-parameter-lists do not apply. */
26802 saved_num_template_parameter_lists
26806 /* Look for the type-specifier. */
26808 CP_PARSER_FLAGS_NONE,
26814 parser->num_template_parameter_lists
26817 /* Leave the scope of the class. */
26822 }
26823 }
26825 /* We did not really want to consume any tokens. */
26829 }
26831 /* Parse the definition of the function given by the DECL_SPECIFIERS,
26832 ATTRIBUTES, and DECLARATOR. The access checks have been deferred;
26833 they must be performed once we are in the scope of the function.
26835 Returns the function defined. */
26837 static tree
26838 cp_parser_function_definition_from_specifiers_and_declarator
26841 tree attributes,
26843 {
26844 tree fn;
26847 /* Begin the function-definition. */
26850 /* The things we're about to see are not directly qualified by any
26851 template headers we've seen thus far. */
26854 /* If there were names looked up in the decl-specifier-seq that we
26855 did not check, check them now. We must wait until we are in the
26856 scope of the function to perform the checks, since the function
26857 might be a friend. */
26861 {
26866 }
26869 {
26870 /* Skip the entire function. */
26873 }
26875 {
26876 /* Seen already, skip it. An error message has already been output. */
26880 /* If this is a function from a class, pop the nested class. */
26883 }
26884 else
26885 {
26886 timevar_id_t tv;
26889 else
26895 }
26898 }
26900 /* Parse the part of a function-definition that follows the
26901 declarator. INLINE_P is TRUE iff this function is an inline
26902 function defined within a class-specifier.
26904 Returns the function defined. */
26906 static tree
26909 {
26910 tree fn;
26915 bool fully_implicit_function_template_p
26918 tree implicit_template_parms
26921 cp_binding_level* implicit_template_scope
26927 /* If the next token is `return', then the code may be trying to
26928 make use of the "named return value" extension that G++ used to
26929 support. */
26932 {
26933 /* Consume the `return' keyword. */
26935 /* Look for the identifier that indicates what value is to be
26936 returned. */
26938 /* Issue an error message. */
26941 /* Skip tokens until we reach the start of the function body. */
26943 {
26950 }
26951 }
26952 /* The `extern' in `extern "C" void f () { ... }' does not apply to
26953 anything declared inside `f'. */
26954 saved_in_unbraced_linkage_specification_p
26957 /* Inside the function, surrounding template-parameter-lists do not
26958 apply. */
26959 saved_num_template_parameter_lists
26963 /* If the next token is `try', `__transaction_atomic', or
26964 `__transaction_relaxed`, then we are looking at either function-try-block
26965 or function-transaction-block. Note that all of these include the
26966 function-body. */
26970 RID_TRANSACTION_RELAXED))
26974 else
26975 cp_parser_ctor_initializer_opt_and_function_body
26978 /* Finish the function. */
26980 /* Generate code for it, if necessary. */
26982 /* Restore the saved values. */
26983 parser->in_unbraced_linkage_specification_p
26985 parser->num_template_parameter_lists
26989 parser->fully_implicit_function_template_p
26991 parser->implicit_template_parms
26993 parser->implicit_template_scope
27000 }
27002 /* Parse a template-declaration body (following argument list). */
27004 static void
27006 tree parameter_list,
27008 {
27012 /* We just processed one more parameter list. */
27015 /* Get the deferred access checks from the parameter list. These
27016 will be checked once we know what is being declared, as for a
27017 member template the checks must be performed in the scope of the
27018 class containing the member. */
27021 /* Tentatively parse for a new template parameter list, which can either be
27022 the template keyword or a template introduction. */
27028 else
27029 {
27030 /* There are no access checks when parsing a template, as we do not
27031 know if a specialization will be a friend. */
27035 checks,
27036 member_p,
27041 /* If this is a member template declaration, let the front
27042 end know. */
27044 {
27049 }
27054 }
27055 /* We are done with the current parameter list. */
27060 /* Finish up. */
27063 /* Check the template arguments for a literal operator template. */
27067 {
27071 else
27072 {
27075 {
27081 }
27083 {
27092 }
27093 else
27095 }
27097 {
27100 " Expected non-type template argument pack <char...>"
27102 decl);
27103 else
27106 decl);
27107 }
27108 }
27110 /* Register member declarations. */
27113 /* If DECL is a function template, we must return to parse it later.
27114 (Even though there is no definition, there might be default
27115 arguments that need handling.) */
27119 }
27121 /* Parse a template introduction header for a template-declaration. Returns
27122 false if tentative parse fails. */
27124 static bool
27126 {
27133 /* Look for the optional `::' operator. */
27136 /* Look for the nested-name-specifier. */
27146 /* Look up the concept for which we will be matching
27147 template parameters. */
27157 /* Look for opening brace for introduction. */
27158 matching_braces braces;
27166 /* Build vector of placeholder parameters and grab
27167 matching identifiers. */
27170 /* The introduction-list shall not be empty. */
27173 {
27176 }
27178 /* Look for closing brace for introduction. */
27183 {
27187 }
27189 /* Build and associate the constraint. */
27192 {
27194 member_p);
27196 }
27200 }
27202 /* Parse a normal template-declaration following the template keyword. */
27204 static void
27206 {
27207 tree parameter_list;
27211 /* Look for the `<' token. */
27215 {
27216 /* 14.5.2.2 [temp.mem]
27218 A local class shall not have member templates. */
27223 }
27224 /* [temp]
27226 A template ... shall not have C linkage. */
27228 {
27231 /* Give it C++ linkage to avoid confusing other parts of the
27232 front end. */
27235 }
27236 else
27239 /* We cannot perform access checks on the template parameter
27240 declarations until we know what is being declared, just as we
27241 cannot check the decl-specifier list. */
27244 /* If the next token is `>', then we have an invalid
27245 specialization. Rather than complain about an invalid template
27246 parameter, issue an error message here. */
27248 {
27252 }
27253 else
27254 {
27255 /* Parse the template parameters. */
27257 }
27259 /* Look for the `>'. */
27262 /* Manage template requirements */
27264 {
27269 }
27272 member_p);
27274 /* For the erroneous case of a template with C linkage, we pushed an
27275 implicit C++ linkage scope; exit that scope now. */
27278 }
27280 /* Parse a template-declaration, assuming that the `export' (and
27281 `extern') keywords, if present, has already been scanned. MEMBER_P
27282 is as for cp_parser_template_declaration. */
27284 static bool
27286 {
27288 {
27292 }
27297 }
27299 /* Perform the deferred access checks from a template-parameter-list.
27300 CHECKS is a TREE_LIST of access checks, as returned by
27301 get_deferred_access_checks. */
27303 static void
27304 cp_parser_perform_template_parameter_access_checks (vec<deferred_access_check, va_gc> *checks)
27305 {
27309 }
27311 /* Parse a `decl-specifier-seq [opt] init-declarator [opt] ;' or
27312 `function-definition' sequence that follows a template header.
27313 If MEMBER_P is true, this declaration appears in a class scope.
27315 Returns the DECL for the declared entity. If FRIEND_P is non-NULL,
27316 *FRIEND_P is set to TRUE iff the declaration is a friend. */
27318 static tree
27324 {
27327 cp_decl_specifier_seq decl_specifiers;
27331 /* This function is only used when processing a template
27332 declaration. */
27336 /* Defer access checks until we know what is being declared. */
27339 /* Try the `decl-specifier-seq [opt] init-declarator [opt]'
27340 alternative. */
27343 CP_PARSER_FLAGS_OPTIONAL,
27349 /* There are no template typedefs. */
27351 {
27355 }
27357 /* Gather up the access checks that occurred the
27358 decl-specifier-seq. */
27361 /* Check for the declaration of a template class. */
27363 {
27366 {
27367 // If this is a declaration, but not a definition, associate
27368 // any constraints with the type declaration. Constraints
27369 // are associated with definitions in cp_parser_class_specifier.
27375 /* In this case:
27377 struct C {
27378 friend template <typename T> struct A<T>::B;
27379 };
27381 A<T>::B will be represented by a TYPENAME_TYPE, and
27382 therefore not recognized by shadow_tag. */
27384 && !decl
27391 else
27394 /* Perform access checks for template parameters. */
27397 /* Give a helpful diagnostic for
27398 template <class T> struct A { } a;
27399 if we aren't already recovering from an error. */
27402 {
27404 "a class template declaration must not declare "
27408 }
27409 }
27410 }
27412 /* Complain about missing 'typename' or other invalid type names. */
27415 {
27416 /* cp_parser_parse_and_diagnose_invalid_type_name calls
27417 cp_parser_skip_to_end_of_block_or_statement, so don't try to parse
27418 the rest of this declaration. */
27421 }
27423 /* If it's not a template class, try for a template function. If
27424 the next token is a `;', then this declaration does not declare
27425 anything. But, if there were errors in the decl-specifiers, then
27426 the error might well have come from an attempted class-specifier.
27427 In that case, there's no need to warn about a missing declarator. */
27431 {
27434 checks,
27436 member_p,
27437 declares_class_or_enum,
27441 /* 7.1.1-1 [dcl.stc]
27443 A storage-class-specifier shall not be specified in an explicit
27444 specialization... */
27446 && explicit_specialization_p
27448 {
27452 }
27456 }
27458 /* Look for a trailing `;' after the declaration. */
27464 out:
27467 /* Clear any current qualification; whatever comes next is the start
27468 of something new. */
27474 }
27476 /* Parse a cast-expression that is not the operand of a unary "&". */
27478 static cp_expr
27480 {
27483 }
27485 /* Parse a functional cast to TYPE. Returns an expression
27486 representing the cast. */
27488 static cp_expr
27490 {
27492 tree expression_list;
27493 cp_expr cast;
27502 {
27512 /* Create a location of the form:
27513 type_name{i, f}
27514 ^~~~~~~~~~~~~~~
27515 with caret == start at the start of the type name,
27516 finishing at the closing brace. */
27517 location_t finish_loc
27520 finish_loc);
27523 }
27532 else
27533 {
27536 }
27539 tf_warning_or_error);
27540 /* [expr.const]/1: In an integral constant expression "only type
27541 conversions to integral or enumeration type can be used". */
27547 NIC_CONSTRUCTOR))
27550 /* Create a location of the form:
27551 float(i)
27552 ^~~~~~~~
27553 with caret == start at the start of the type name,
27554 finishing at the closing paren. */
27555 location_t finish_loc
27560 }
27562 /* Save the tokens that make up the body of a member function defined
27563 in a class-specifier. The DECL_SPECIFIERS and DECLARATOR have
27564 already been parsed. The ATTRIBUTES are any GNU "__attribute__"
27565 specifiers applied to the declaration. Returns the FUNCTION_DECL
27566 for the member function. */
27568 static tree
27572 tree attributes)
27573 {
27576 tree fn;
27579 /* Create the FUNCTION_DECL. */
27583 /* If something went badly wrong, bail out now. */
27585 {
27586 /* If there's a function-body, skip it. */
27591 }
27593 /* Remember it, if there default args to post process. */
27596 /* Save away the tokens that make up the body of the
27597 function. */
27603 RID_TRANSACTION_ATOMIC))
27604 {
27606 /* Match cp_parser_txn_attribute_opt [[ identifier ]]. */
27613 {
27619 }
27620 else
27623 {
27627 }
27628 }
27630 /* Handle function try blocks. */
27632 {
27635 }
27636 /* We can have braced-init-list mem-initializers before the fn body. */
27638 {
27641 {
27642 /* cache_group will stop after an un-nested { } pair, too. */
27646 /* variadic mem-inits have ... after the ')'. */
27649 }
27650 }
27652 /* Handle function try blocks. */
27658 /* Save away the inline definition; we will process it when the
27659 class is complete. */
27663 /* We need to know that this was defined in the class, so that
27664 friend templates are handled correctly. */
27667 /* Add FN to the queue of functions to be parsed later. */
27671 }
27673 /* Save the tokens that make up the in-class initializer for a non-static
27674 data member. Returns a DEFAULT_ARG. */
27676 static tree
27678 {
27680 }
27682 /* Parse a template-argument-list, as well as the trailing ">" (but
27683 not the opening "<"). See cp_parser_template_argument_list for the
27684 return value. */
27686 static tree
27688 {
27689 tree arguments;
27690 tree saved_scope;
27691 tree saved_qualifying_scope;
27692 tree saved_object_scope;
27697 /* [temp.names]
27699 When parsing a template-id, the first non-nested `>' is taken as
27700 the end of the template-argument-list rather than a greater-than
27701 operator. */
27702 saved_greater_than_is_operator_p
27705 /* Parsing the argument list may modify SCOPE, so we save it
27706 here. */
27710 /* We need to evaluate the template arguments, even though this
27711 template-id may be nested within a "sizeof". */
27716 /* Parse the template-argument-list itself. */
27720 else
27722 /* Look for the `>' that ends the template-argument-list. If we find
27723 a '>>' instead, it's probably just a typo. */
27725 {
27727 {
27728 /* In C++0x, a `>>' in a template argument list or cast
27729 expression is considered to be two separate `>'
27730 tokens. So, change the current token to a `>', but don't
27731 consume it: it will be consumed later when the outer
27732 template argument list (or cast expression) is parsed.
27733 Note that this replacement of `>' for `>>' is necessary
27734 even if we are parsing tentatively: in the tentative
27735 case, after calling
27736 cp_parser_enclosed_template_argument_list we will always
27737 throw away all of the template arguments and the first
27738 closing `>', either because the template argument list
27739 was erroneous or because we are replacing those tokens
27740 with a CPP_TEMPLATE_ID token. The second `>' (which will
27741 not have been thrown away) is needed either to close an
27742 outer template argument list or to complete a new-style
27743 cast. */
27746 }
27748 {
27749 /* If we're in a nested template argument list, the '>>' has
27750 to be a typo for '> >'. We emit the error message, but we
27751 continue parsing and we push a '>' as next token, so that
27752 the argument list will be parsed correctly. Note that the
27753 global source location is still on the token before the
27754 '>>', so we need to say explicitly where we want it. */
27762 }
27763 else
27764 {
27765 /* If this is not a nested template argument list, the '>>'
27766 is a typo for '>'. Emit an error message and continue.
27767 Same deal about the token location, but here we can get it
27768 right by consuming the '>>' before issuing the diagnostic. */
27771 "spurious %<>>%>, use %<>%> to terminate "
27773 }
27774 }
27775 else
27777 /* The `>' token might be a greater-than operator again now. */
27778 parser->greater_than_is_operator_p
27780 /* Restore the SAVED_SCOPE. */
27788 }
27790 /* MEMBER_FUNCTION is a member function, or a friend. If default
27791 arguments, or the body of the function have not yet been parsed,
27792 parse them now. */
27794 static void
27796 {
27798 /* If this member is a template, get the underlying
27799 FUNCTION_DECL. */
27803 /* There should not be any class definitions in progress at this
27804 point; the bodies of members are only parsed outside of all class
27805 definitions. */
27807 /* While we're parsing the member functions we might encounter more
27808 classes. We want to handle them right away, but we don't want
27809 them getting mixed up with functions that are currently in the
27810 queue. */
27813 /* Make sure that any template parameters are in scope. */
27816 /* If the body of the function has not yet been parsed, parse it
27817 now. */
27819 {
27820 tree function_scope;
27823 /* The function is no longer pending; we are processing it. */
27828 /* If this is a local class, enter the scope of the containing
27829 function. */
27834 /* Push the body of the function onto the lexer stack. */
27837 /* Let the front end know that we going to be defining this
27838 function. */
27842 /* Don't do access checking if it is a templated function. */
27846 /* #pragma omp declare reduction needs special parsing. */
27848 {
27853 }
27854 else
27855 /* Now, parse the body of the function. */
27862 /* Leave the scope of the containing function. */
27866 }
27868 /* Remove any template parameters from the symbol table. */
27871 /* Restore the queue. */
27874 }
27876 /* If DECL contains any default args, remember it on the unparsed
27877 functions queue. */
27879 static void
27881 {
27882 tree probe;
27885 probe;
27888 {
27892 }
27893 }
27895 /* DEFAULT_ARG contains the saved tokens for the initializer of DECL,
27896 which is either a FIELD_DECL or PARM_DECL. Parse it and return
27897 the result. For a PARM_DECL, PARMTYPE is the corresponding type
27898 from the parameter-type-list. */
27900 static tree
27903 {
27905 tree parsed_arg;
27911 /* Push the saved tokens for the default argument onto the parser's
27912 lexer stack. */
27918 /* Parse the default argument. */
27929 {
27930 /* In a non-template class, check conversions now. In a template,
27931 we'll wait and instantiate these as needed. */
27934 tf_warning_or_error);
27937 else
27939 }
27941 /* If the token stream has not been completely used up, then
27942 there was extra junk after the end of the default
27943 argument. */
27945 {
27948 else
27950 }
27952 /* Revert to the main lexer. */
27956 }
27958 /* FIELD is a non-static data member with an initializer which we saved for
27959 later; parse it now. */
27961 static void
27963 {
27964 tree def;
27971 NULL_TREE);
27977 }
27979 /* FN is a FUNCTION_DECL which may contains a parameter with an
27980 unparsed DEFAULT_ARG. Parse the default args now. This function
27981 assumes that the current scope is the scope in which the default
27982 argument should be processed. */
27984 static void
27986 {
27990 /* While we're parsing the default args, we might (due to the
27991 statement expression extension) encounter more classes. We want
27992 to handle them right away, but we don't want them getting mixed
27993 up with default args that are currently in the queue. */
27996 /* Local variable names (and the `this' keyword) may not appear
27997 in a default argument. */
28008 {
28010 tree parsed_arg;
28012 tree copy;
28019 /* This can happen for a friend declaration for a function
28020 already declared with default arguments. */
28023 parsed_arg
28025 default_arg,
28029 /* Update any instantiations we've already created. */
28033 }
28037 /* Make sure no default arg is missing. */
28040 /* Restore the state of local_variables_forbidden_p. */
28043 /* Restore the queue. */
28045 }
28047 /* Subroutine of cp_parser_sizeof_operand, for handling C++11
28049 sizeof ... ( identifier )
28051 where the 'sizeof' token has already been consumed. */
28053 static tree
28055 {
28056 /* Consume the `...'. */
28060 matching_parens parens;
28064 else
28072 /* The name is not qualified. */
28091 }
28093 /* Parse the operand of `sizeof' (or a similar operator). Returns
28094 either a TYPE or an expression, depending on the form of the
28095 input. The KEYWORD indicates which kind of expression we have
28096 encountered. */
28098 static tree
28100 {
28107 /* If it's a `...', then we are computing the length of a parameter
28108 pack. */
28113 /* Types cannot be defined in a `sizeof' expression. Save away the
28114 old message. */
28116 /* And create the new one. */
28122 /* The restrictions on constant-expressions do not apply inside
28123 sizeof expressions. */
28124 saved_integral_constant_expression_p
28126 saved_non_integral_constant_expression_p
28130 /* Do not actually evaluate the expression. */
28133 /* If it's a `(', then we might be looking at the type-id
28134 construction. */
28136 {
28139 /* We can't be sure yet whether we're looking at a type-id or an
28140 expression. */
28143 matching_parens parens;
28146 /* Note: as a GNU Extension, compound literals are considered
28147 postfix-expressions as they are in C99, so they are valid
28148 arguments to sizeof. See comment in cp_parser_cast_expression
28149 for details. */
28152 else
28153 {
28156 /* Look for the type-id. */
28158 /* Look for the closing `)'. */
28161 }
28163 /* If all went well, then we're done. */
28165 {
28166 cp_decl_specifier_seq decl_specs;
28168 /* Build a trivial decl-specifier-seq. */
28172 /* Call grokdeclarator to figure out what type this is. */
28175 TYPENAME,
28178 }
28179 }
28181 /* If the type-id production did not work out, then we must be
28182 looking at the unary-expression production. */
28186 /* Go back to evaluating expressions. */
28190 /* Free the message we created. */
28192 /* And restore the old one. */
28194 parser->integral_constant_expression_p
28196 parser->non_integral_constant_expression_p
28200 }
28202 /* If the current declaration has no declarator, return true. */
28204 static bool
28206 {
28207 /* If the next token is a `;' or a `,' then there is no
28208 declarator. */
28211 }
28213 /* Update the DECL_SPECS to reflect the storage class indicated by
28214 KEYWORD. */
28216 static void
28221 {
28222 cp_storage_class storage_class;
28225 {
28229 }
28231 {
28234 }
28239 {
28242 }
28245 {
28263 }
28267 /* A storage class specifier cannot be applied alongside a typedef
28268 specifier. If there is a typedef specifier present then set
28269 conflicting_specifiers_p which will trigger an error later
28270 on in grokdeclarator. */
28273 }
28275 /* Update the DECL_SPECS to reflect the TYPE_SPEC. If TYPE_DEFINITION_P
28276 is true, the type is a class or enum definition. */
28278 static void
28280 tree type_spec,
28283 {
28286 /* If the user tries to redeclare bool, char16_t, char32_t, or wchar_t
28287 (with, for example, in "typedef int wchar_t;") we remember that
28288 this is what happened. In system headers, we ignore these
28289 declarations so that G++ can work with system headers that are not
28290 C++-safe. */
28292 && !type_definition_p
28302 {
28305 ds_redefined_builtin_type_spec,
28306 token);
28308 {
28312 }
28313 }
28316 else
28317 {
28322 }
28323 }
28325 /* True iff TOKEN is the GNU keyword __thread. */
28327 static bool
28329 {
28332 }
28334 /* Set the location for a declarator specifier and check if it is
28335 duplicated.
28337 DECL_SPECS is the sequence of declarator specifiers onto which to
28338 set the location.
28340 DS is the single declarator specifier to set which location is to
28341 be set onto the existing sequence of declarators.
28343 LOCATION is the location for the declarator specifier to
28344 consider. */
28346 static void
28349 {
28358 {
28362 }
28363 else
28364 {
28366 {
28370 else
28371 {
28374 OPT_Wlong_long,
28376 }
28377 }
28379 {
28383 {
28387 }
28388 else
28389 {
28392 }
28393 }
28394 else
28395 {
28411 "__complex"
28412 };
28416 }
28417 }
28418 }
28420 /* Return true iff the declarator specifier DS is present in the
28421 sequence of declarator specifiers DECL_SPECS. */
28423 bool
28425 cp_decl_spec ds)
28426 {
28433 }
28435 /* DECL_SPECIFIERS is the representation of a decl-specifier-seq.
28436 Returns TRUE iff `friend' appears among the DECL_SPECIFIERS. */
28438 static bool
28440 {
28442 }
28444 /* Issue an error message indicating that TOKEN_DESC was expected.
28445 If KEYWORD is true, it indicated this function is called by
28446 cp_parser_require_keword and the required token can only be
28447 a indicated keyword.
28449 If MATCHING_LOCATION is not UNKNOWN_LOCATION, then highlight it
28450 within any error as the location of an "opening" token matching
28451 the close token TYPE (e.g. the location of the '(' when TOKEN_DESC is
28452 RT_CLOSE_PAREN). */
28454 static void
28456 required_token token_desc,
28458 location_t matching_location)
28459 {
28465 {
28534 }
28537 {
28539 {
28617 }
28618 }
28622 }
28625 /* If the next token is of the indicated TYPE, consume it. Otherwise,
28626 issue an error message indicating that TOKEN_DESC was expected.
28628 Returns the token consumed, if the token had the appropriate type.
28629 Otherwise, returns NULL.
28631 If MATCHING_LOCATION is not UNKNOWN_LOCATION, then highlight it
28632 within any error as the location of an "opening" token matching
28633 the close token TYPE (e.g. the location of the '(' when TOKEN_DESC is
28634 RT_CLOSE_PAREN). */
28639 required_token token_desc,
28640 location_t matching_location)
28641 {
28644 else
28645 {
28646 /* Output the MESSAGE -- unless we're parsing tentatively. */
28649 matching_location);
28651 }
28652 }
28654 /* An error message is produced if the next token is not '>'.
28655 All further tokens are skipped until the desired token is
28656 found or '{', '}', ';' or an unbalanced ')' or ']'. */
28658 static void
28660 {
28661 /* Current level of '< ... >'. */
28663 /* Ignore '<' and '>' nested inside '( ... )' or '[ ... ]'. */
28666 /* Are we ready, yet? If not, issue error message. */
28670 /* Skip tokens until the desired token is found. */
28672 {
28673 /* Peek at the next token. */
28675 {
28683 /* C++0x views the `>>' operator as two `>' tokens, but
28684 C++98 does not. */
28687 {
28688 /* We've hit a `>>' where the first `>' closes the
28689 template argument list, and the second `>' is
28690 spurious. Just consume the `>>' and stop; we've
28691 already produced at least one error. */
28694 }
28695 /* Fall through for C++0x, so we handle the second `>' in
28696 the `>>'. */
28701 {
28702 /* We've reached the token we want, consume it and stop. */
28705 }
28724 /* The '>' was probably forgotten, don't look further. */
28729 }
28731 /* Consume this token. */
28733 }
28734 }
28736 /* If the next token is the indicated keyword, consume it. Otherwise,
28737 issue an error message indicating that TOKEN_DESC was expected.
28739 Returns the token consumed, if the token had the appropriate type.
28740 Otherwise, returns NULL. */
28745 required_token token_desc)
28746 {
28750 {
28752 UNKNOWN_LOCATION);
28754 }
28757 }
28759 /* Returns TRUE iff TOKEN is a token that can begin the body of a
28760 function-definition. */
28762 static bool
28764 {
28767 /* A ctor-initializer begins with a `:'. */
28769 /* A function-try-block begins with `try'. */
28771 /* A function-transaction-block begins with `__transaction_atomic'
28772 or `__transaction_relaxed'. */
28775 /* The named return value extension begins with `return'. */
28777 }
28779 /* Returns TRUE iff the next token is the ":" or "{" beginning a class
28780 definition. */
28782 static bool
28784 {
28791 }
28793 /* Returns TRUE iff the next token is the "," or ">" (or `>>', in
28794 C++0x) ending a template-argument. */
28796 static bool
28798 {
28806 }
28808 /* Returns TRUE iff the n-th token is a "<", or the n-th is a "[" and the
28809 (n+1)-th is a ":" (which is a possible digraph typo for "< ::"). */
28811 static bool
28814 {
28820 /* Check for the sequence `<::' in the original code. It would be lexed as
28821 `[:', where `[' is a digraph, and there is no whitespace before
28822 `:'. */
28824 {
28829 }
28831 }
28833 /* Returns the kind of tag indicated by TOKEN, if it is a class-key,
28834 or none_type otherwise. */
28836 static enum tag_types
28838 {
28840 {
28850 }
28851 }
28853 /* Returns the kind of tag indicated by TOKEN, if it is a type-parameter-key,
28854 or none_type otherwise or if the token is null. */
28856 static enum tag_types
28858 {
28863 {
28871 }
28872 }
28874 /* Issue an error message if the CLASS_KEY does not match the TYPE. */
28876 static void
28878 {
28882 {
28886 type))
28889 }
28890 }
28892 /* Issue an error message if DECL is redeclared with different
28893 access than its original declaration [class.access.spec/3].
28894 This applies to nested classes, nested class templates and
28895 enumerations [class.mem/1]. */
28897 static void
28899 {
28910 }
28912 /* Look for the `template' keyword, as a syntactic disambiguator.
28913 Return TRUE iff it is present, in which case it will be
28914 consumed. */
28916 static bool
28918 {
28920 {
28921 /* In C++98 the `template' keyword can only be used within templates;
28922 outside templates the parser can always figure out what is a
28923 template and what is not. In C++11, per the resolution of DR 468,
28924 `template' is allowed in cases where it is not strictly necessary. */
28927 {
28930 "in C++98 %<template%> (as a disambiguator) is only "
28932 /* If this part of the token stream is rescanned, the same
28933 error message would be generated. So, we purge the token
28934 from the stream. */
28937 }
28938 else
28939 {
28940 /* Consume the `template' keyword. */
28943 }
28944 }
28946 }
28948 /* The next token is a CPP_NESTED_NAME_SPECIFIER. Consume the token,
28949 set PARSER->SCOPE, and perform other related actions. */
28951 static void
28953 {
28956 /* Get the stored value. */
28958 /* Set the scope from the stored value. */
28962 }
28964 /* Consume tokens up through a non-nested END token. Returns TRUE if we
28965 encounter the end of a block before what we were looking for. */
28967 static bool
28971 {
28973 {
28976 /* Abort a parenthesized expression if we encounter a semicolon. */
28980 /* If we've reached the end of the file, stop. */
28986 /* We've hit the end of an enclosing block, so there's been some
28987 kind of syntax error. */
28990 /* Consume the token. */
28992 /* See if it starts a new group. */
28994 {
28996 /* In theory this should probably check end == '}', but
28997 cp_parser_save_member_function_body needs it to exit
28998 after either '}' or ')' when called with ')'. */
29001 }
29003 {
29007 }
29012 }
29013 }
29015 /* Like above, for caching a default argument or NSDMI. Both of these are
29016 terminated by a non-nested comma, but it can be unclear whether or not a
29017 comma is nested in a template argument list unless we do more parsing.
29018 In order to handle this ambiguity, when we encounter a ',' after a '<'
29019 we try to parse what follows as a parameter-declaration-list (in the
29020 case of a default argument) or a member-declarator (in the case of an
29021 NSDMI). If that succeeds, then we stop caching. */
29023 static tree
29025 {
29030 tree default_argument;
29032 /* Add tokens until we have processed the entire default
29033 argument. We add the range [first_token, token). */
29036 {
29037 /* For list-initialization, this is straightforward. */
29040 }
29042 {
29045 /* Peek at the next token. */
29047 /* What we do depends on what token we have. */
29049 {
29050 /* In valid code, a default argument must be
29051 immediately followed by a `,' `)', or `...'. */
29054 {
29055 /* If we've seen a '<', we might be in a
29056 template-argument-list. Until Core issue 325 is
29057 resolved, we don't know how this situation ought
29058 to be handled, so try to DTRT. We check whether
29059 what comes after the comma is a valid parameter
29060 declaration list. If it is, then the comma ends
29061 the default argument; otherwise the default
29062 argument continues. */
29066 /* Set ITALP so cp_parser_parameter_declaration_list
29067 doesn't decide to commit to this parse. */
29074 {
29075 /* Parse declarators until we reach a non-comma or
29076 somthing that cannot be an initializer.
29077 Just checking whether we're looking at a single
29078 declarator is insufficient. Consider:
29079 int var = tuple<T,U>::x;
29080 The template parameter 'U' looks exactly like a
29081 declarator. */
29082 do
29083 {
29094 }
29096 /* If we met an '=' or ';' then the original comma
29097 was the end of the NSDMI. Otherwise assume
29098 we're still in the NSDMI. */
29101 }
29102 else
29103 {
29110 }
29117 }
29118 /* FALLTHRU */
29121 /* If we run into a non-nested `;', `}', or `]',
29122 then the code is invalid -- but the default
29123 argument is certainly over. */
29128 /* Handle correctly int n = sizeof ... ( p ); */
29131 /* Update DEPTH, if necessary. */
29146 /* This might be the comparison operator, or it might
29147 start a template argument list. */
29154 /* Fall through for C++0x, which treats the `>>'
29155 operator like two `>' tokens in certain
29156 cases. */
29161 {
29162 /* This might be an operator, or it might close a
29163 template argument list. But if a previous '<'
29164 started a template argument list, this will have
29165 closed it, so we can't be in one anymore. */
29169 }
29172 /* If we run out of tokens, issue an error message. */
29180 /* In these cases, we should look for template-ids.
29181 For example, if the default argument is
29182 `X<int, double>()', we need to do name lookup to
29183 figure out whether or not `X' is a template; if
29184 so, the `,' does not end the default argument.
29186 That is not yet done. */
29191 }
29193 /* If we've reached the end, stop. */
29197 /* Add the token to the token block. */
29199 }
29201 /* Create a DEFAULT_ARG to represent the unparsed default
29202 argument. */
29209 }
29211 /* A location to use for diagnostics about an unparsed DEFAULT_ARG. */
29213 location_t
29215 {
29220 }
29222 /* Begin parsing tentatively. We always save tokens while parsing
29223 tentatively so that if the tentative parsing fails we can restore the
29224 tokens. */
29226 static void
29228 {
29229 /* Enter a new parsing context. */
29231 /* Begin saving tokens. */
29233 /* In order to avoid repetitive access control error messages,
29234 access checks are queued up until we are no longer parsing
29235 tentatively. */
29237 }
29239 /* Commit to the currently active tentative parse. */
29241 static void
29243 {
29247 /* Mark all of the levels as committed. */
29250 {
29257 }
29258 }
29260 /* Commit to the topmost currently active tentative parse.
29262 Note that this function shouldn't be called when there are
29263 irreversible side-effects while in a tentative state. For
29264 example, we shouldn't create a permanent entry in the symbol
29265 table, or issue an error message that might not apply if the
29266 tentative parse is aborted. */
29268 static void
29270 {
29275 {
29283 }
29284 }
29286 /* Abort the currently active tentative parse. All consumed tokens
29287 will be rolled back, and no diagnostics will be issued. */
29289 static void
29291 {
29295 /* Now, pretend that we want to see if the construct was
29296 successfully parsed. */
29298 }
29300 /* Stop parsing tentatively. If a parse error has occurred, restore the
29301 token stream. Otherwise, commit to the tokens we have consumed.
29302 Returns true if no error occurred; false otherwise. */
29304 static bool
29306 {
29310 /* Remember whether or not an error occurred, since we are about to
29311 destroy that information. */
29313 /* Remove the topmost context from the stack. */
29316 /* If no parse errors occurred, commit to the tentative parse. */
29318 {
29319 /* Commit to the tokens read tentatively, unless that was
29320 already done. */
29325 }
29326 /* Otherwise, if errors occurred, roll back our state so that things
29327 are just as they were before we began the tentative parse. */
29328 else
29329 {
29332 }
29333 /* Add the context to the front of the free list. */
29338 }
29340 /* Returns true if we are parsing tentatively and are not committed to
29341 this tentative parse. */
29343 static bool
29345 {
29348 }
29350 /* Returns nonzero iff an error has occurred during the most recent
29351 tentative parse. */
29353 static bool
29355 {
29358 }
29360 /* Returns nonzero if GNU extensions are allowed. */
29362 static bool
29364 {
29366 }
29367 \f
29368 /* Objective-C++ Productions */
29371 /* Parse an Objective-C expression, which feeds into a primary-expression
29372 above.
29374 objc-expression:
29375 objc-message-expression
29376 objc-string-literal
29377 objc-encode-expression
29378 objc-protocol-expression
29379 objc-selector-expression
29381 Returns a tree representation of the expression. */
29383 static cp_expr
29385 {
29386 /* Try to figure out what kind of declaration is present. */
29390 {
29400 {
29412 }
29413 /* FALLTHRU */
29419 }
29422 }
29424 /* Parse an Objective-C message expression.
29426 objc-message-expression:
29427 [ objc-message-receiver objc-message-args ]
29429 Returns a representation of an Objective-C message. */
29431 static tree
29433 {
29445 /* Construct a location e.g.
29446 [self func1:5]
29447 ^~~~~~~~~~~~~~
29448 ranging from the '[' to the ']', with the caret at the start. */
29453 }
29455 /* Parse an objc-message-receiver.
29457 objc-message-receiver:
29458 expression
29459 simple-type-specifier
29461 Returns a representation of the type or expression. */
29463 static tree
29465 {
29466 tree rcv;
29468 /* An Objective-C message receiver may be either (1) a type
29469 or (2) an expression. */
29473 /* If that worked out, fine. */
29480 CP_PARSER_FLAGS_NONE);
29487 }
29489 /* Parse the arguments and selectors comprising an Objective-C message.
29491 objc-message-args:
29492 objc-selector
29493 objc-selector-args
29494 objc-selector-args , objc-comma-args
29496 objc-selector-args:
29497 objc-selector [opt] : assignment-expression
29498 objc-selector-args objc-selector [opt] : assignment-expression
29500 objc-comma-args:
29501 assignment-expression
29502 objc-comma-args , assignment-expression
29504 Returns a TREE_LIST, with TREE_PURPOSE containing a list of
29505 selector arguments and TREE_VALUE containing a list of comma
29506 arguments. */
29508 static tree
29510 {
29516 {
29522 /* Detect if we have a unary selector. */
29531 sel_args
29536 }
29538 /* Handle non-selector arguments, if any. */
29540 {
29541 tree arg;
29546 addl_args
29551 }
29554 {
29557 }
29560 }
29562 /* Parse an Objective-C encode expression.
29564 objc-encode-expression:
29565 @encode objc-typename
29567 Returns an encoded representation of the type argument. */
29569 static cp_expr
29571 {
29572 tree type;
29577 matching_parens parens;
29584 {
29588 }
29590 /* This happens if we find @encode(T) (where T is a template
29591 typename or something dependent on a template typename) when
29592 parsing a template. In that case, we can't compile it
29593 immediately, but we rather create an AT_ENCODE_EXPR which will
29594 need to be instantiated when the template is used.
29595 */
29597 {
29601 }
29604 /* Build a location of the form:
29605 @encode(int)
29606 ^~~~~~~~~~~~
29607 with caret==start at the @ token, finishing at the close paren. */
29608 location_t combined_loc
29613 }
29615 /* Parse an Objective-C @defs expression. */
29617 static tree
29619 {
29620 tree name;
29623 matching_parens parens;
29629 }
29631 /* Parse an Objective-C protocol expression.
29633 objc-protocol-expression:
29634 @protocol ( identifier )
29636 Returns a representation of the protocol expression. */
29638 static tree
29640 {
29641 tree proto;
29645 matching_parens parens;
29650 /* Build a location of the form:
29651 @protocol(prot)
29652 ^~~~~~~~~~~~~~~
29653 with caret==start at the @ token, finishing at the close paren. */
29654 location_t combined_loc
29660 }
29662 /* Parse an Objective-C selector expression.
29664 objc-selector-expression:
29665 @selector ( objc-method-signature )
29667 objc-method-signature:
29668 objc-selector
29669 objc-selector-seq
29671 objc-selector-seq:
29672 objc-selector :
29673 objc-selector-seq objc-selector :
29675 Returns a representation of the method selector. */
29677 static tree
29679 {
29686 matching_parens parens;
29692 {
29701 {
29702 /* Detect if we have a unary selector. */
29704 {
29707 }
29708 else
29709 {
29711 }
29712 }
29717 {
29718 sel_seq
29721 sel_seq
29724 }
29725 else
29726 sel_seq
29731 }
29733 finish_selector:
29737 /* Build a location of the form:
29738 @selector(func)
29739 ^~~~~~~~~~~~~~~
29740 with caret==start at the @ token, finishing at the close paren. */
29741 location_t combined_loc
29745 /* TODO: objc_build_selector_expr doesn't always honor the location. */
29748 }
29750 /* Parse a list of identifiers.
29752 objc-identifier-list:
29753 identifier
29754 objc-identifier-list , identifier
29756 Returns a TREE_LIST of identifier nodes. */
29758 static tree
29760 {
29761 tree identifier;
29762 tree list;
29773 {
29780 identifier));
29782 }
29785 }
29787 /* Parse an Objective-C alias declaration.
29789 objc-alias-declaration:
29790 @compatibility_alias identifier identifier ;
29792 This function registers the alias mapping with the Objective-C front end.
29793 It returns nothing. */
29795 static void
29797 {
29805 }
29807 /* Parse an Objective-C class forward-declaration.
29809 objc-class-declaration:
29810 @class objc-identifier-list ;
29812 The function registers the forward declarations with the Objective-C
29813 front end. It returns nothing. */
29815 static void
29817 {
29820 {
29821 tree id;
29831 else
29833 }
29835 }
29837 /* Parse a list of Objective-C protocol references.
29839 objc-protocol-refs-opt:
29840 objc-protocol-refs [opt]
29842 objc-protocol-refs:
29843 < objc-identifier-list >
29845 Returns a TREE_LIST of identifiers, if any. */
29847 static tree
29849 {
29853 {
29857 }
29860 }
29862 /* Parse a Objective-C visibility specification. */
29864 static void
29866 {
29870 {
29885 }
29887 /* Eat '@private'/'@protected'/'@public'. */
29889 }
29891 /* Parse an Objective-C method type. Return 'true' if it is a class
29892 (+) method, and 'false' if it is an instance (-) method. */
29896 {
29899 else
29901 }
29903 /* Parse an Objective-C protocol qualifier. */
29905 static tree
29907 {
29920 {
29925 }
29928 }
29930 /* Parse an Objective-C typename. */
29932 static tree
29934 {
29938 {
29941 matching_parens parens;
29945 /* An ObjC type name may consist of just protocol qualifiers, in which
29946 case the type shall default to 'id'. */
29948 {
29951 /* If the type could not be parsed, an error has already
29952 been produced. For error recovery, behave as if it had
29953 not been specified, which will use the default type
29954 'id'. */
29956 {
29958 /* We need to skip to the closing parenthesis as
29959 cp_parser_type_id() does not seem to do it for
29960 us. */
29965 }
29966 }
29970 }
29973 }
29975 /* Check to see if TYPE refers to an Objective-C selector name. */
29977 static bool
29979 {
29985 }
29987 /* Parse an Objective-C selector. */
29989 static tree
29991 {
29995 {
29998 }
30000 /* C++ operator names are allowed to appear in ObjC selectors. */
30002 {
30015 }
30016 }
30018 /* Parse an Objective-C params list. */
30020 static tree
30022 {
30028 {
30038 /* Detect if we have a unary selector. */
30041 {
30044 }
30048 {
30049 /* Something went quite wrong. There should be a colon
30050 here, but there is not. Stop parsing parameters. */
30052 }
30054 /* New ObjC allows attributes on parameters too. */
30059 params
30062 type_name,
30063 identifier,
30064 parm_attr));
30067 }
30070 {
30073 }
30075 /* We allow tail attributes for the method. */
30077 {
30085 }
30088 {
30091 }
30093 }
30095 /* Parse the non-keyword Objective-C params. */
30097 static tree
30100 {
30106 {
30108 tree parm;
30114 {
30119 }
30121 /* TODO: parse attributes for tail parameters. */
30130 }
30132 /* We allow tail attributes for the method. */
30134 {
30136 {
30141 }
30142 else
30143 /* We have an error, but parse the attributes, so that we can
30144 carry on. */
30150 }
30153 }
30155 /* Parse a linkage specification, a pragma, an extra semicolon or a block. */
30157 static void
30159 {
30162 /* If the next token is `extern' and the following token is a string
30163 literal, then we have a linkage specification. */
30165 && cp_parser_is_pure_string_literal
30168 /* Handle #pragma, if any. */
30171 /* Allow stray semicolons. */
30174 /* Mark methods as optional or required, when building protocols. */
30176 {
30179 }
30181 {
30184 }
30187 /* Other stray characters must generate errors. */
30189 {
30193 }
30194 /* Finally, try to parse a block-declaration, or a function-definition. */
30195 else
30197 }
30199 /* Parse a method signature. */
30201 static tree
30203 {
30219 }
30221 static bool
30223 {
30224 tree tattr;
30229 /* If the attributes are followed by a method introducer, this is not allowed.
30230 Dump the attributes and flag the situation. */
30235 /* Otherwise, the attributes introduce some interstitial code, possibly so
30236 rewind to allow that check. */
30239 }
30241 /* Parse an Objective-C method prototype list. */
30243 static void
30245 {
30249 {
30251 {
30256 else
30260 {
30264 }
30267 }
30273 OPT_Wattributes,
30275 else
30276 /* Allow for interspersed non-ObjC++ code. */
30280 }
30284 else
30288 }
30290 /* Parse an Objective-C method definition list. */
30292 static void
30294 {
30298 {
30299 tree meth;
30302 {
30308 else
30313 {
30317 }
30319 NULL_TREE);
30321 /* For historical reasons, we accept an optional semicolon. */
30328 {
30335 }
30336 }
30337 /* The following case will be removed once @synthesize is
30338 completely implemented. */
30349 else
30350 /* Allow for interspersed non-ObjC++ code. */
30354 }
30358 else
30362 }
30364 /* Parse Objective-C ivars. */
30366 static void
30368 {
30379 {
30380 cp_decl_specifier_seq declspecs;
30382 tree prefix_attributes;
30390 CP_PARSER_FLAGS_OPTIONAL,
30394 /* auto, register, static, extern, mutable. */
30396 {
30399 }
30401 /* thread_local. */
30403 {
30406 }
30408 /* typedef. */
30410 {
30413 }
30418 /* Keep going until we hit the `;' at the end of the
30419 declaration. */
30421 {
30426 /* Check for a (possibly unnamed) bitfield declaration. */
30434 {
30435 /* Get the name of the bitfield. */
30438 sfk_none);
30440 eat_colon:
30442 /* Get the width of the bitfield. */
30443 width
30445 }
30446 else
30447 {
30448 /* Parse the declarator. */
30449 declarator
30455 }
30457 /* Look for attributes that apply to the ivar. */
30459 /* Remember which attributes are prefix attributes and
30460 which are not. */
30462 /* Combine the attributes. */
30466 /* Create the bitfield declaration. */
30469 else
30474 /* Add the instance variable. */
30478 /* Reset PREFIX_ATTRIBUTES. */
30480 {
30485 }
30490 {
30493 }
30495 }
30499 }
30504 /* Do not consume the RID_AT_END, so it will be read again as terminating
30505 the @interface of @implementation. */
30509 /* For historical reasons, we accept an optional semicolon. */
30512 }
30514 /* Parse an Objective-C protocol declaration. */
30516 static void
30518 {
30524 {
30529 }
30531 /* See if we have a forward declaration or a definition. */
30534 /* Try a forward declaration first. */
30536 {
30538 {
30539 tree id;
30549 else
30551 }
30553 }
30555 /* Ok, we got a full-fledged definition (or at least should). */
30556 else
30557 {
30562 }
30563 }
30565 /* Parse an Objective-C superclass or category. */
30567 static void
30572 {
30578 {
30581 }
30583 {
30584 matching_parens parens;
30587 /* If there is no category name, and this is an @interface, we
30588 have a class extension. */
30590 {
30593 }
30594 else
30598 }
30599 }
30601 /* Parse an Objective-C class interface. */
30603 static void
30605 {
30612 {
30613 /* It's hard to recover because even if valid @interface stuff
30614 is to follow, we can't compile it (or validate it) if we
30615 don't even know which class it refers to. Let's assume this
30616 was a stray '@interface' token in the stream and skip it.
30617 */
30619 }
30624 /* We have either a class or a category on our hands. */
30627 else
30628 {
30630 /* Handle instance variable declarations, if any. */
30633 }
30636 }
30638 /* Parse an Objective-C class implementation. */
30640 static void
30642 {
30649 {
30650 /* It's hard to recover because even if valid @implementation
30651 stuff is to follow, we can't compile it (or validate it) if
30652 we don't even know which class it refers to. Let's assume
30653 this was a stray '@implementation' token in the stream and
30654 skip it.
30655 */
30657 }
30661 /* We have either a class or a category on our hands. */
30664 else
30665 {
30667 /* Handle instance variable declarations, if any. */
30670 }
30673 }
30675 /* Consume the @end token and finish off the implementation. */
30677 static void
30679 {
30682 }
30684 /* Parse an Objective-C declaration. */
30686 static void
30688 {
30689 /* Try to figure out what kind of declaration is present. */
30694 {
30710 }
30713 {
30736 }
30737 }
30739 /* Parse an Objective-C try-catch-finally statement.
30741 objc-try-catch-finally-stmt:
30742 @try compound-statement objc-catch-clause-seq [opt]
30743 objc-finally-clause [opt]
30745 objc-catch-clause-seq:
30746 objc-catch-clause objc-catch-clause-seq [opt]
30748 objc-catch-clause:
30749 @catch ( objc-exception-declaration ) compound-statement
30751 objc-finally-clause:
30752 @finally compound-statement
30754 objc-exception-declaration:
30755 parameter-declaration
30756 '...'
30758 where '...' is to be interpreted literally, that is, it means CPP_ELLIPSIS.
30760 Returns NULL_TREE.
30762 PS: This function is identical to c_parser_objc_try_catch_finally_statement
30763 for C. Keep them in sync. */
30765 static tree
30767 {
30768 location_t location;
30769 tree stmt;
30774 /* NB: The @try block needs to be wrapped in its own STATEMENT_LIST
30775 node, lest it get absorbed into the surrounding block. */
30781 {
30785 matching_parens parens;
30791 {
30792 /* We have "@catch (...)" (where the '...' are literally
30793 what is in the code). Skip the '...'.
30794 parameter_declaration is set to NULL_TREE, and
30795 objc_being_catch_clauses() knows that that means
30796 '...'. */
30799 }
30800 else
30801 {
30802 /* We have "@catch (NSException *exception)" or something
30803 like that. Parse the parameter declaration. */
30807 else
30812 }
30815 else
30816 {
30817 /* If there was no open parenthesis, we are recovering from
30818 an error, and we are trying to figure out what mistake
30819 the user has made. */
30821 /* If there is an immediate closing parenthesis, the user
30822 probably forgot the opening one (ie, they typed "@catch
30823 NSException *e)". Parse the closing parenthesis and keep
30824 going. */
30828 /* If these is no immediate closing parenthesis, the user
30829 probably doesn't know that parenthesis are required at
30830 all (ie, they typed "@catch NSException *e"). So, just
30831 forget about the closing parenthesis and keep going. */
30832 }
30836 }
30838 {
30841 /* NB: The @finally block needs to be wrapped in its own STATEMENT_LIST
30842 node, lest it get absorbed into the surrounding block. */
30846 }
30849 }
30851 /* Parse an Objective-C synchronized statement.
30853 objc-synchronized-stmt:
30854 @synchronized ( expression ) compound-statement
30856 Returns NULL_TREE. */
30858 static tree
30860 {
30861 location_t location;
30868 matching_parens parens;
30873 /* NB: The @synchronized block needs to be wrapped in its own STATEMENT_LIST
30874 node, lest it get absorbed into the surrounding block. */
30879 }
30881 /* Parse an Objective-C throw statement.
30883 objc-throw-stmt:
30884 @throw assignment-expression [opt] ;
30886 Returns a constructed '@throw' statement. */
30888 static tree
30890 {
30902 }
30904 /* Parse an Objective-C statement. */
30906 static tree
30908 {
30909 /* Try to figure out what kind of declaration is present. */
30913 {
30924 }
30927 }
30929 /* If we are compiling ObjC++ and we see an __attribute__ we neeed to
30930 look ahead to see if an objc keyword follows the attributes. This
30931 is to detect the use of prefix attributes on ObjC @interface and
30932 @protocol. */
30934 static bool
30936 {
30941 {
30944 }
30947 }
30949 /* This routine is a minimal replacement for
30950 c_parser_struct_declaration () used when parsing the list of
30951 types/names or ObjC++ properties. For example, when parsing the
30952 code
30954 @property (readonly) int a, b, c;
30956 this function is responsible for parsing "int a, int b, int c" and
30957 returning the declarations as CHAIN of DECLs.
30959 TODO: Share this code with cp_parser_objc_class_ivars. It's very
30960 similar parsing. */
30961 static tree
30963 {
30965 cp_decl_specifier_seq declspecs;
30967 tree prefix_attributes;
30970 CP_PARSER_FLAGS_NONE,
30977 /* auto, register, static, extern, mutable. */
30979 {
30982 }
30984 /* thread_local. */
30986 {
30989 }
30991 /* typedef. */
30993 {
30996 }
31001 /* Keep going until we hit the `;' at the end of the declaration. */
31003 {
31008 /* Parse the declarator. */
31012 /* Look for attributes that apply to the ivar. */
31014 /* Remember which attributes are prefix attributes and
31015 which are not. */
31017 /* Combine the attributes. */
31027 /* Reset PREFIX_ATTRIBUTES. */
31029 {
31034 }
31041 {
31044 }
31045 else
31047 }
31049 }
31051 /* Parse an Objective-C @property declaration. The syntax is:
31053 objc-property-declaration:
31054 '@property' objc-property-attributes[opt] struct-declaration ;
31056 objc-property-attributes:
31057 '(' objc-property-attribute-list ')'
31059 objc-property-attribute-list:
31060 objc-property-attribute
31061 objc-property-attribute-list, objc-property-attribute
31063 objc-property-attribute
31064 'getter' = identifier
31065 'setter' = identifier
31066 'readonly'
31067 'readwrite'
31068 'assign'
31069 'retain'
31070 'copy'
31071 'nonatomic'
31073 For example:
31074 @property NSString *name;
31075 @property (readonly) id object;
31076 @property (retain, nonatomic, getter=getTheName) id name;
31077 @property int a, b, c;
31079 PS: This function is identical to
31080 c_parser_objc_at_property_declaration for C. Keep them in sync. */
31081 static void
31083 {
31084 /* The following variables hold the attributes of the properties as
31085 parsed. They are 'false' or 'NULL_TREE' if the attribute was not
31086 seen. When we see an attribute, we set them to 'true' (if they
31087 are boolean properties) or to the identifier (if they have an
31088 argument, ie, for getter and setter). Note that here we only
31089 parse the list of attributes, check the syntax and accumulate the
31090 attributes that we find. objc_add_property_declaration() will
31091 then process the information. */
31101 /* 'properties' is the list of properties that we read. Usually a
31102 single one, but maybe more (eg, in "@property int a, b, c;" there
31103 are three). */
31104 tree properties;
31105 location_t loc;
31111 /* Parse the optional attribute list... */
31113 {
31114 /* Eat the '('. */
31115 matching_parens parens;
31119 {
31125 {
31128 }
31132 {
31143 {
31147 else
31152 }
31155 {
31159 }
31161 {
31163 {
31166 }
31167 else
31171 else
31173 }
31174 else
31175 {
31177 {
31180 }
31181 else
31183 }
31189 }
31196 else
31198 }
31200 /* FIXME: "@property (setter, assign);" will generate a spurious
31201 "error: expected ‘)’ before ‘,’ token". This is because
31202 cp_parser_require, unlike the C counterpart, will produce an
31203 error even if we are in error recovery. */
31205 {
31210 }
31211 }
31213 /* ... and the property declaration(s). */
31217 {
31219 /* If the next token is now a `;', consume it. */
31223 }
31227 else
31228 {
31229 /* Comma-separated properties are chained together in
31230 reverse order; add them one by one. */
31239 }
31242 }
31244 /* Parse an Objective-C++ @synthesize declaration. The syntax is:
31246 objc-synthesize-declaration:
31247 @synthesize objc-synthesize-identifier-list ;
31249 objc-synthesize-identifier-list:
31250 objc-synthesize-identifier
31251 objc-synthesize-identifier-list, objc-synthesize-identifier
31253 objc-synthesize-identifier
31254 identifier
31255 identifier = identifier
31257 For example:
31258 @synthesize MyProperty;
31259 @synthesize OneProperty, AnotherProperty=MyIvar, YetAnotherProperty;
31261 PS: This function is identical to c_parser_objc_at_synthesize_declaration
31262 for C. Keep them in sync.
31263 */
31264 static void
31266 {
31268 location_t loc;
31273 {
31277 {
31280 }
31282 {
31286 {
31289 }
31290 }
31291 else
31296 else
31298 }
31301 }
31303 /* Parse an Objective-C++ @dynamic declaration. The syntax is:
31305 objc-dynamic-declaration:
31306 @dynamic identifier-list ;
31308 For example:
31309 @dynamic MyProperty;
31310 @dynamic MyProperty, AnotherProperty;
31312 PS: This function is identical to c_parser_objc_at_dynamic_declaration
31313 for C. Keep them in sync.
31314 */
31315 static void
31317 {
31319 location_t loc;
31324 {
31325 tree property;
31328 {
31331 }
31335 else
31337 }
31340 }
31342 \f
31343 /* OpenMP 2.5 / 3.0 / 3.1 / 4.0 parsing routines. */
31345 /* Returns name of the next clause.
31346 If the clause is not recognized PRAGMA_OMP_CLAUSE_NONE is returned and
31347 the token is not consumed. Otherwise appropriate pragma_omp_clause is
31348 returned and the token is consumed. */
31350 static pragma_omp_clause
31352 {
31368 {
31373 {
31554 }
31555 }
31561 }
31563 /* Validate that a clause of the given type does not already exist. */
31565 static void
31568 {
31569 tree c;
31573 {
31576 }
31577 }
31579 /* OpenMP 2.5:
31580 variable-list:
31581 identifier
31582 variable-list , identifier
31584 In addition, we match a closing parenthesis (or, if COLON is non-NULL,
31585 colon). An opening parenthesis will have been consumed by the caller.
31587 If KIND is nonzero, create the appropriate node and install the decl
31588 in OMP_CLAUSE_DECL and add the node to the head of the list.
31590 If KIND is zero, create a TREE_LIST with the decl in TREE_PURPOSE;
31591 return the list created.
31593 COLON can be NULL if only closing parenthesis should end the list,
31594 or pointer to bool which will receive false if the list is terminated
31595 by closing parenthesis or true if the list is terminated by colon. */
31597 static tree
31600 {
31604 {
31607 }
31609 {
31614 && current_class_ptr
31616 {
31622 }
31623 else
31624 {
31635 else
31640 }
31642 ;
31644 {
31646 {
31648 /* The OpenACC cache directive explicitly only allows "array
31649 elements or subarrays". */
31651 {
31655 }
31656 /* FALLTHROUGH. */
31661 {
31662 location_t loc
31667 decl
31671 }
31672 /* FALLTHROUGH. */
31676 {
31684 parser->colon_corrects_to_scope_p
31688 else
31689 {
31690 /* Look for `:'. */
31694 CPP_CLOSE_SQUARE))
31696 }
31697 /* Look for the closing `]'. */
31699 RT_CLOSE_SQUARE))
31703 }
31707 }
31713 }
31714 else
31717 get_comma:
31721 }
31727 {
31731 }
31734 {
31737 /* Try to resync to an unnested comma. Copied from
31738 cp_parser_parenthesized_expression_list. */
31739 skip_comma:
31748 }
31751 }
31753 /* Similarly, but expect leading and trailing parenthesis. This is a very
31754 common case for omp clauses. */
31756 static tree
31758 {
31762 }
31764 /* OpenACC 2.0:
31765 copy ( variable-list )
31766 copyin ( variable-list )
31767 copyout ( variable-list )
31768 create ( variable-list )
31769 delete ( variable-list )
31770 present ( variable-list ) */
31772 static tree
31774 tree list)
31775 {
31778 {
31811 }
31819 }
31821 /* OpenACC 2.0:
31822 deviceptr ( variable-list ) */
31824 static tree
31826 {
31830 /* Can't use OMP_CLAUSE_MAP here (that is, can't use the generic
31831 cp_parser_oacc_data_clause), as for PRAGMA_OACC_CLAUSE_DEVICEPTR,
31832 variable-list must only allow for pointer variables. */
31835 {
31842 }
31845 }
31847 /* OpenACC 2.5:
31848 auto
31849 finalize
31850 independent
31851 nohost
31852 seq */
31854 static tree
31858 {
31863 }
31865 /* OpenACC:
31866 num_gangs ( expression )
31867 num_workers ( expression )
31868 vector_length ( expression ) */
31870 static tree
31873 {
31876 matching_parens parens;
31884 {
31889 }
31897 }
31899 /* OpenACC:
31901 gang [( gang-arg-list )]
31902 worker [( [num:] int-expr )]
31903 vector [( [length:] int-expr )]
31905 where gang-arg is one of:
31907 [num:] int-expr
31908 static: size-expr
31910 and size-expr may be:
31912 *
31913 int-expr
31914 */
31916 static tree
31919 {
31929 {
31930 matching_parens parens;
31933 do
31934 {
31938 /* Gang static argument. */
31941 {
31949 {
31952 }
31954 /* Check for the '*' argument. */
31958 CPP_CLOSE_PAREN)))
31959 {
31964 {
31967 }
31969 }
31970 }
31971 /* Worker num: argument and vector length: arguments. */
31975 {
31978 }
31980 /* Now collect the actual argument. */
31982 {
31985 }
31997 {
32000 }
32002 }
32007 }
32021 cleanup_error:
32024 }
32026 /* OpenACC 2.0:
32027 tile ( size-expr-list ) */
32029 static tree
32031 {
32035 /* Collapse and tile are mutually exclusive. (The spec doesn't say
32036 so, but the spec authors never considered such a case and have
32037 differing opinions on what it might mean, including 'not
32038 allowed'.) */
32041 clause_loc);
32046 do
32047 {
32054 {
32057 }
32058 else
32062 }
32065 /* Consume the trailing ')'. */
32073 }
32075 /* OpenACC 2.0
32076 Parse wait clause or directive parameters. */
32078 static tree
32080 {
32090 {
32095 }
32102 {
32106 {
32109 else
32110 {
32117 }
32118 }
32119 }
32122 }
32124 /* OpenACC:
32125 wait ( int-expr-list ) */
32127 static tree
32129 {
32138 }
32140 /* OpenMP 3.0:
32141 collapse ( constant-expression ) */
32143 static tree
32145 {
32147 location_t loc;
32148 HOST_WIDE_INT n;
32151 matching_parens parens;
32169 {
32172 }
32181 }
32183 /* OpenMP 2.5:
32184 default ( none | shared )
32186 OpenACC:
32187 default ( none | present ) */
32189 static tree
32192 {
32194 tree c;
32196 matching_parens parens;
32200 {
32205 {
32226 }
32229 }
32230 else
32231 {
32232 invalid_kind:
32235 else
32237 }
32254 }
32256 /* OpenMP 3.1:
32257 final ( expression ) */
32259 static tree
32261 {
32264 matching_parens parens;
32283 }
32285 /* OpenMP 2.5:
32286 if ( expression )
32288 OpenMP 4.5:
32289 if ( directive-name-modifier : expression )
32291 directive-name-modifier:
32292 parallel | task | taskloop | target data | target | target update
32293 | target enter data | target exit data */
32295 static tree
32298 {
32302 matching_parens parens;
32307 {
32319 {
32322 {
32335 else
32336 {
32337 location_t loc
32342 }
32345 {
32347 {
32352 }
32354 {
32355 location_t loc
32359 }
32360 }
32361 }
32362 }
32364 {
32366 {
32369 }
32370 else
32371 {
32373 {
32374 location_t loc
32377 }
32379 }
32380 }
32381 }
32393 {
32396 {
32399 {
32409 }
32411 p);
32413 }
32415 {
32418 else
32421 }
32424 {
32428 }
32429 }
32437 }
32439 /* OpenMP 3.1:
32440 mergeable */
32442 static tree
32445 {
32446 tree c;
32449 location);
32454 }
32456 /* OpenMP 2.5:
32457 nowait */
32459 static tree
32462 {
32463 tree c;
32470 }
32472 /* OpenMP 2.5:
32473 num_threads ( expression ) */
32475 static tree
32477 location_t location)
32478 {
32481 matching_parens parens;
32501 }
32503 /* OpenMP 4.5:
32504 num_tasks ( expression ) */
32506 static tree
32508 location_t location)
32509 {
32512 matching_parens parens;
32532 }
32534 /* OpenMP 4.5:
32535 grainsize ( expression ) */
32537 static tree
32539 location_t location)
32540 {
32543 matching_parens parens;
32563 }
32565 /* OpenMP 4.5:
32566 priority ( expression ) */
32568 static tree
32570 location_t location)
32571 {
32574 matching_parens parens;
32594 }
32596 /* OpenMP 4.5:
32597 hint ( expression ) */
32599 static tree
32601 location_t location)
32602 {
32605 matching_parens parens;
32624 }
32626 /* OpenMP 4.5:
32627 defaultmap ( tofrom : scalar ) */
32629 static tree
32631 location_t location)
32632 {
32636 matching_parens parens;
32641 {
32644 }
32648 {
32651 }
32657 {
32660 }
32664 {
32667 }
32673 location);
32679 out_err:
32684 }
32686 /* OpenMP 2.5:
32687 ordered
32689 OpenMP 4.5:
32690 ordered ( constant-expression ) */
32692 static tree
32695 {
32697 HOST_WIDE_INT n;
32703 {
32704 matching_parens parens;
32721 {
32723 "ordered argument needs positive constant integer "
32726 }
32727 }
32733 }
32735 /* OpenMP 2.5:
32736 reduction ( reduction-operator : variable-list )
32738 reduction-operator:
32739 One of: + * - & ^ | && ||
32741 OpenMP 3.1:
32743 reduction-operator:
32744 One of: + * - & ^ | && || min max
32746 OpenMP 4.0:
32748 reduction-operator:
32749 One of: + * - & ^ | && ||
32750 id-expression */
32752 static tree
32754 {
32762 {
32772 }
32776 else
32777 {
32788 {
32818 }
32819 else
32820 {
32822 resync_fail:
32827 }
32828 }
32834 NULL);
32836 {
32839 }
32842 }
32844 /* OpenMP 2.5:
32845 schedule ( schedule-kind )
32846 schedule ( schedule-kind , expression )
32848 schedule-kind:
32849 static | dynamic | guided | runtime | auto
32851 OpenMP 4.5:
32852 schedule ( schedule-modifier : schedule-kind )
32853 schedule ( schedule-modifier [ , schedule-modifier ] : schedule-kind , expression )
32855 schedule-modifier:
32856 simd
32857 monotonic
32858 nonmonotonic */
32860 static tree
32862 {
32866 matching_parens parens;
32873 {
32882 else
32888 else
32889 {
32892 }
32893 }
32896 {
32901 {
32922 }
32923 }
32928 else
32934 == (OMP_CLAUSE_SCHEDULE_MONOTONIC
32936 {
32940 }
32943 {
32958 else
32963 }
32975 invalid_kind:
32977 resync_fail:
32982 }
32984 /* OpenMP 3.0:
32985 untied */
32987 static tree
32990 {
32991 tree c;
32998 }
33000 /* OpenMP 4.0:
33001 inbranch
33002 notinbranch */
33004 static tree
33007 {
33012 }
33014 /* OpenMP 4.0:
33015 parallel
33016 for
33017 sections
33018 taskgroup */
33020 static tree
33024 {
33028 }
33030 /* OpenMP 4.5:
33031 nogroup */
33033 static tree
33036 {
33041 }
33043 /* OpenMP 4.5:
33044 simd
33045 threads */
33047 static tree
33051 {
33056 }
33058 /* OpenMP 4.0:
33059 num_teams ( expression ) */
33061 static tree
33063 location_t location)
33064 {
33067 matching_parens parens;
33087 }
33089 /* OpenMP 4.0:
33090 thread_limit ( expression ) */
33092 static tree
33094 location_t location)
33095 {
33098 matching_parens parens;
33118 }
33120 /* OpenMP 4.0:
33121 aligned ( variable-list )
33122 aligned ( variable-list : constant-expression ) */
33124 static tree
33126 {
33130 matching_parens parens;
33138 {
33148 }
33154 }
33156 /* OpenMP 4.0:
33157 linear ( variable-list )
33158 linear ( variable-list : expression )
33160 OpenMP 4.5:
33161 linear ( modifier ( variable-list ) )
33162 linear ( modifier ( variable-list ) : expression ) */
33164 static tree
33167 {
33172 matching_parens parens;
33177 {
33189 else
33191 }
33196 else
33197 {
33206 }
33209 {
33214 {
33225 {
33228 }
33231 }
33242 }
33245 {
33248 }
33251 }
33253 /* OpenMP 4.0:
33254 safelen ( constant-expression ) */
33256 static tree
33258 location_t location)
33259 {
33262 matching_parens parens;
33281 }
33283 /* OpenMP 4.0:
33284 simdlen ( constant-expression ) */
33286 static tree
33288 location_t location)
33289 {
33292 matching_parens parens;
33311 }
33313 /* OpenMP 4.5:
33314 vec:
33315 identifier [+/- integer]
33316 vec , identifier [+/- integer]
33317 */
33319 static tree
33321 tree list)
33322 {
33326 {
33329 }
33332 {
33339 else
33340 {
33341 t = cp_parser_lookup_name_simple
33346 id_loc);
33347 }
33353 {
33356 }
33360 {
33363 }
33367 {
33370 }
33373 add_to_vector:
33375 {
33379 }
33385 }
33388 {
33394 }
33396 }
33398 /* OpenMP 4.0:
33399 depend ( depend-kind : variable-list )
33401 depend-kind:
33402 in | out | inout
33404 OpenMP 4.5:
33405 depend ( source )
33407 depend ( sink : vec ) */
33409 static tree
33411 {
33415 matching_parens parens;
33420 {
33434 else
33436 }
33437 else
33443 {
33453 }
33460 else
33461 {
33467 }
33470 invalid_kind:
33472 resync_fail:
33477 }
33479 /* OpenMP 4.0:
33480 map ( map-kind : variable-list )
33481 map ( variable-list )
33483 map-kind:
33484 alloc | to | from | tofrom
33486 OpenMP 4.5:
33487 map-kind:
33488 alloc | to | from | tofrom | release | delete
33490 map ( always [,] map-kind: variable-list ) */
33492 static tree
33494 {
33503 {
33508 {
33511 nth++;
33517 {
33522 }
33523 }
33524 }
33528 {
33542 else
33543 {
33549 }
33552 }
33555 {
33559 }
33562 NULL);
33568 }
33570 /* OpenMP 4.0:
33571 device ( expression ) */
33573 static tree
33575 location_t location)
33576 {
33579 matching_parens parens;
33599 }
33601 /* OpenMP 4.0:
33602 dist_schedule ( static )
33603 dist_schedule ( static , expression ) */
33605 static tree
33607 location_t location)
33608 {
33611 matching_parens parens;
33622 {
33633 }
33638 location);
33642 invalid_kind:
33644 resync_fail:
33649 }
33651 /* OpenMP 4.0:
33652 proc_bind ( proc-bind-kind )
33654 proc-bind-kind:
33655 master | close | spread */
33657 static tree
33659 location_t location)
33660 {
33661 tree c;
33668 {
33678 else
33680 }
33681 else
33690 location);
33695 invalid_kind:
33697 resync_fail:
33702 }
33704 /* OpenACC:
33705 async [( int-expr )] */
33707 static tree
33709 {
33716 {
33717 matching_parens parens;
33726 }
33736 }
33738 /* Parse all OpenACC clauses. The set clauses allowed by the directive
33739 is a bitmask in MASK. Return the list of clauses found. */
33741 static tree
33745 {
33750 {
33751 location_t here;
33752 pragma_omp_clause c_kind;
33753 omp_clause_code code;
33764 {
33821 clauses);
33839 OMP_CLAUSE_IF_PRESENT,
33845 OMP_CLAUSE_INDEPENDENT,
33857 clauses);
33863 clauses);
33871 clauses);
33889 clauses);
33901 clauses);
33915 }
33920 {
33921 /* Remove the invalid clause(s) from the list to avoid
33922 confusing the rest of the compiler. */
33925 }
33926 }
33928 saw_error:
33935 }
33937 /* Parse all OpenMP clauses. The set clauses allowed by the directive
33938 is a bitmask in MASK. Return the list of clauses found; the result
33939 of clause default goes in *pdefault. */
33941 static tree
33945 {
33951 {
33952 pragma_omp_clause c_kind;
33963 {
33975 clauses);
33989 clauses);
34009 clauses);
34014 clauses);
34024 clauses);
34058 clauses);
34072 clauses);
34087 OMP_CLAUSE_NOTINBRANCH,
34096 {
34097 clause_not_first:
34101 }
34131 clauses);
34132 else
34142 clauses);
34160 {
34165 }
34208 clauses
34214 clauses
34222 }
34227 {
34228 /* Remove the invalid clause(s) from the list to avoid
34229 confusing the rest of the compiler. */
34232 }
34233 }
34234 saw_error:
34237 {
34240 else
34242 }
34244 }
34246 /* OpenMP 2.5:
34247 structured-block:
34248 statement
34250 In practice, we're also interested in adding the statement to an
34251 outer node. So it is convenient if we work around the fact that
34252 cp_parser_statement calls add_stmt. */
34254 static unsigned
34256 {
34259 /* Only move the values to IN_OMP_BLOCK if they weren't false.
34260 This preserves the "not within loop or switch" style error messages
34261 for nonsense cases like
34262 void foo() {
34263 #pragma omp single
34264 break;
34265 }
34266 */
34271 }
34273 static void
34275 {
34277 }
34279 static tree
34281 {
34289 }
34291 /* OpenMP 2.5:
34292 # pragma omp atomic new-line
34293 expression-stmt
34295 expression-stmt:
34296 x binop= expr | x++ | ++x | x-- | --x
34297 binop:
34298 +, *, -, /, &, ^, |, <<, >>
34300 where x is an lvalue expression with scalar type.
34302 OpenMP 3.1:
34303 # pragma omp atomic new-line
34304 update-stmt
34306 # pragma omp atomic read new-line
34307 read-stmt
34309 # pragma omp atomic write new-line
34310 write-stmt
34312 # pragma omp atomic update new-line
34313 update-stmt
34315 # pragma omp atomic capture new-line
34316 capture-stmt
34318 # pragma omp atomic capture new-line
34319 capture-block
34321 read-stmt:
34322 v = x
34323 write-stmt:
34324 x = expr
34325 update-stmt:
34326 expression-stmt | x = x binop expr
34327 capture-stmt:
34328 v = expression-stmt
34329 capture-block:
34330 { v = x; update-stmt; } | { update-stmt; v = x; }
34332 OpenMP 4.0:
34333 update-stmt:
34334 expression-stmt | x = x binop expr | x = expr binop x
34335 capture-stmt:
34336 v = update-stmt
34337 capture-block:
34338 { v = x; update-stmt; } | { update-stmt; v = x; } | { v = x; x = expr; }
34340 where x and v are lvalue expressions with scalar type. */
34342 static void
34344 {
34352 {
34357 {
34363 }
34364 }
34366 {
34378 else
34382 }
34384 {
34390 {
34395 {
34398 }
34399 }
34400 }
34404 {
34414 else
34419 {
34420 /* atomic write is represented by OMP_ATOMIC with NOP_EXPR
34421 opcode. */
34426 }
34430 {
34433 }
34434 else
34435 {
34441 }
34444 }
34446 restart:
34450 {
34457 /* FALLTHROUGH */
34467 /* FALLTHROUGH */
34482 /* Undo effects of boolean_increment for post {in,de}crement. */
34484 /* FALLTHRU */
34488 {
34489 /* Undo effects of boolean_increment. */
34491 {
34492 /* This is pre or post increment. */
34497 && !structured_block
34501 }
34502 }
34503 /* FALLTHRU */
34506 {
34541 {
34545 }
34548 {
34554 {
34559 }
34561 {
34573 {
34575 {
34580 }
34581 else
34583 }
34587 }
34590 {
34597 }
34601 }
34605 {
34608 {
34616 }
34618 {
34623 }
34658 }
34669 /* FALLTHROUGH */
34674 }
34681 }
34682 stmt_done:
34684 {
34695 }
34697 {
34700 }
34701 done:
34707 saw_error:
34710 {
34714 {
34718 }
34719 }
34720 }
34723 /* OpenMP 2.5:
34724 # pragma omp barrier new-line */
34726 static void
34728 {
34731 }
34733 /* OpenMP 2.5:
34734 # pragma omp critical [(name)] new-line
34735 structured-block
34737 OpenMP 4.5:
34738 # pragma omp critical [(name) [hint(expression)]] new-line
34739 structured-block */
34741 #define OMP_CRITICAL_CLAUSE_MASK \
34742 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_HINT) )
34744 static tree
34746 {
34750 {
34751 matching_parens parens;
34765 OMP_CRITICAL_CLAUSE_MASK,
34767 }
34768 else
34773 }
34775 /* OpenMP 2.5:
34776 # pragma omp flush flush-vars[opt] new-line
34778 flush-vars:
34779 ( variable-list ) */
34781 static void
34783 {
34789 }
34791 /* Helper function, to parse omp for increment expression. */
34793 static tree
34795 {
34800 {
34803 }
34806 {
34813 /* Fall through: OpenMP disallows NE_EXPR. */
34817 }
34819 /* If decl is an iterator, preserve LHS and RHS of the relational
34820 expr until finish_omp_for. */
34831 }
34833 /* Helper function, to parse omp for increment expression. */
34835 static tree
34837 {
34841 cp_id_kind idk;
34845 {
34854 }
34863 {
34868 }
34875 {
34879 }
34892 do
34893 {
34900 {
34902 {
34905 else
34907 tf_warning_or_error);
34908 }
34909 else
34912 }
34913 }
34917 {
34923 }
34924 else
34928 }
34930 /* Parse the initialization statement of an OpenMP for loop.
34932 Return true if the resulting construct should have an
34933 OMP_CLAUSE_PRIVATE added to it. */
34935 static tree
34943 {
34949 /* See 2.5.1 (in OpenMP 3.0, similar wording is in 2.5 standard too):
34951 init-expr:
34952 var = lb
34953 integer-type var = lb
34954 random-access-iterator-type var = lb
34955 pointer-type var = lb
34956 */
34957 cp_decl_specifier_seq type_specifiers;
34959 /* First, try to parse as an initialized declaration. See
34960 cp_parser_condition, from whence the bulk of this is copied. */
34967 {
34968 /* If parsing a type specifier seq succeeded, then this
34969 MUST be a initialized declaration. */
34974 CP_PARSER_DECLARATOR_NAMED,
34985 else
34986 {
34996 {
34998 CPP_OPEN_PAREN))
35001 else
35002 /* Trigger an error. */
35007 }
35011 {
35019 {
35022 auto_node);
35027 }
35030 asm_specification,
35031 LOOKUP_ONLYCONVERTING);
35034 {
35037 }
35038 else
35039 {
35042 {
35044 /* Move lambda DECL_EXPRs to FOR_BLOCK. */
35046 {
35050 {
35054 }
35056 }
35058 {
35063 }
35064 }
35065 }
35067 }
35068 else
35069 {
35070 /* Consume '='. */
35074 non_class:
35077 else
35080 asm_specification,
35081 LOOKUP_ONLYCONVERTING);
35082 }
35086 }
35087 }
35088 else
35089 {
35090 cp_id_kind idk;
35091 /* If parsing a type specifier sequence failed, then
35092 this MUST be a simple expression. */
35098 && decl
35101 {
35112 {
35117 }
35122 }
35124 && decl
35127 {
35128 tree rhs;
35136 rhs,
35137 tf_warning_or_error));
35140 }
35141 else
35142 {
35147 {
35151 }
35152 }
35153 }
35155 }
35157 /* Parse the restricted form of the for statement allowed by OpenMP. */
35159 static tree
35162 {
35166 location_t loc_first;
35177 {
35180 }
35183 {
35186 }
35189 {
35195 }
35197 {
35200 {
35202 "%<linear%> clause may not be specified together "
35205 }
35206 else
35208 }
35221 {
35224 location_t loc;
35227 {
35231 }
35234 matching_parens parens;
35241 add_private_clause
35247 {
35250 {
35256 }
35257 else
35259 }
35266 {
35271 {
35275 }
35278 {
35279 /* Move lastprivate (decl) clause to OMP_FOR_CLAUSES. */
35283 {
35286 }
35287 else
35288 {
35291 }
35293 }
35294 else
35295 {
35300 }
35301 }
35304 {
35305 tree c;
35307 {
35316 decl);
35320 decl);
35321 }
35323 {
35328 else
35333 {
35336 /* For linear, signal that we need to fill up
35337 the so far unknown linear step. */
35340 }
35341 }
35342 }
35351 {
35352 /* If decl is an iterator, preserve the operator on decl
35353 until finish_omp_for. */
35355 && ((processing_template_decl
35360 else
35364 }
35376 {
35379 }
35384 /* FIXME: OpenMP 3.0 draft isn't very clear on what exactly is allowed
35385 in between the collapsed for loops to be still considered perfectly
35386 nested. Hopefully the final version clarifies this.
35387 For now handle (multiple) {'s and empty statements. */
35390 {
35394 {
35396 bracecount++;
35397 }
35401 else
35402 {
35409 }
35410 }
35413 {
35416 }
35417 }
35422 /* Note that we saved the original contents of this flag when we entered
35423 the structured block, and so we don't need to re-save it here. */
35426 /* Note that the grammar doesn't call for a structured block here,
35427 though the loop as a whole is a structured block. */
35434 else
35439 {
35441 {
35443 nbraces--;
35444 }
35447 else
35448 {
35450 {
35453 }
35458 }
35459 }
35462 {
35466 else
35468 }
35472 }
35474 /* Helper function for OpenMP parsing, split clauses and call
35475 finish_omp_clauses on each of the set of clauses afterwards. */
35477 static void
35480 {
35486 }
35488 /* OpenMP 4.0:
35489 #pragma omp simd simd-clause[optseq] new-line
35490 for-loop */
35492 #define OMP_SIMD_CLAUSE_MASK \
35493 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_SAFELEN) \
35494 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_SIMDLEN) \
35495 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_LINEAR) \
35496 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_ALIGNED) \
35497 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_PRIVATE) \
35498 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_LASTPRIVATE) \
35499 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_REDUCTION) \
35500 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_COLLAPSE))
35502 static tree
35506 {
35517 {
35521 OMP_CLAUSE_ORDERED);
35523 {
35525 "%<ordered%> clause with parameter may not be specified "
35528 }
35529 }
35540 }
35542 /* OpenMP 2.5:
35543 #pragma omp for for-clause[optseq] new-line
35544 for-loop
35546 OpenMP 4.0:
35547 #pragma omp for simd for-simd-clause[optseq] new-line
35548 for-loop */
35550 #define OMP_FOR_CLAUSE_MASK \
35551 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_PRIVATE) \
35552 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_FIRSTPRIVATE) \
35553 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_LASTPRIVATE) \
35554 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_LINEAR) \
35555 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_REDUCTION) \
35556 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_ORDERED) \
35557 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_SCHEDULE) \
35558 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_NOWAIT) \
35559 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_COLLAPSE))
35561 static tree
35565 {
35572 /* parallel for{, simd} disallows nowait clause, but for
35573 target {teams distribute ,}parallel for{, simd} it should be accepted. */
35576 /* Composite distribute parallel for{, simd} disallows ordered clause. */
35581 {
35586 {
35610 }
35611 }
35613 {
35616 }
35618 /* Composite distribute parallel for disallows linear clause. */
35625 {
35628 }
35639 }
35641 /* OpenMP 2.5:
35642 # pragma omp master new-line
35643 structured-block */
35645 static tree
35647 {
35651 }
35653 /* OpenMP 2.5:
35654 # pragma omp ordered new-line
35655 structured-block
35657 OpenMP 4.5:
35658 # pragma omp ordered ordered-clauses new-line
35659 structured-block */
35661 #define OMP_ORDERED_CLAUSE_MASK \
35662 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_THREADS) \
35663 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_SIMD))
35665 #define OMP_ORDERED_DEPEND_CLAUSE_MASK \
35666 (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DEPEND)
35668 static bool
35671 {
35675 {
35680 {
35682 {
35685 }
35687 {
35689 "%<depend%> clause may only be used in compound "
35693 }
35694 tree clauses
35696 OMP_ORDERED_DEPEND_CLAUSE_MASK,
35700 }
35701 }
35703 tree clauses
35714 }
35716 /* OpenMP 2.5:
35718 section-scope:
35719 { section-sequence }
35721 section-sequence:
35722 section-directive[opt] structured-block
35723 section-sequence section-directive structured-block */
35725 static tree
35727 {
35732 matching_braces braces;
35740 {
35744 }
35747 {
35755 {
35759 }
35761 {
35764 }
35769 }
35780 }
35782 /* OpenMP 2.5:
35783 # pragma omp sections sections-clause[optseq] newline
35784 sections-scope */
35786 #define OMP_SECTIONS_CLAUSE_MASK \
35787 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_PRIVATE) \
35788 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_FIRSTPRIVATE) \
35789 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_LASTPRIVATE) \
35790 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_REDUCTION) \
35791 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_NOWAIT))
35793 static tree
35796 {
35808 {
35811 }
35818 }
35820 /* OpenMP 2.5:
35821 # pragma omp parallel parallel-clause[optseq] new-line
35822 structured-block
35823 # pragma omp parallel for parallel-for-clause[optseq] new-line
35824 structured-block
35825 # pragma omp parallel sections parallel-sections-clause[optseq] new-line
35826 structured-block
35828 OpenMP 4.0:
35829 # pragma omp parallel for simd parallel-for-simd-clause[optseq] new-line
35830 structured-block */
35832 #define OMP_PARALLEL_CLAUSE_MASK \
35833 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_IF) \
35834 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_PRIVATE) \
35835 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_FIRSTPRIVATE) \
35836 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DEFAULT) \
35837 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_SHARED) \
35838 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_COPYIN) \
35839 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_REDUCTION) \
35840 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_NUM_THREADS) \
35841 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_PROC_BIND))
35843 static tree
35847 {
35854 /* #pragma omp target parallel{, for, for simd} disallow copyin clause. */
35860 {
35868 if_p);
35872 if_p);
35875 block);
35880 }
35881 /* When combined with distribute, parallel has to be followed by for.
35882 #pragma omp target parallel is allowed though. */
35886 {
35890 }
35892 {
35895 }
35897 {
35901 {
35911 block);
35914 }
35915 }
35920 {
35923 }
35931 }
35933 /* OpenMP 2.5:
35934 # pragma omp single single-clause[optseq] new-line
35935 structured-block */
35937 #define OMP_SINGLE_CLAUSE_MASK \
35938 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_PRIVATE) \
35939 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_FIRSTPRIVATE) \
35940 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_COPYPRIVATE) \
35941 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_NOWAIT))
35943 static tree
35945 {
35955 }
35957 /* OpenMP 3.0:
35958 # pragma omp task task-clause[optseq] new-line
35959 structured-block */
35961 #define OMP_TASK_CLAUSE_MASK \
35962 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_IF) \
35963 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_UNTIED) \
35964 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DEFAULT) \
35965 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_PRIVATE) \
35966 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_FIRSTPRIVATE) \
35967 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_SHARED) \
35968 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_FINAL) \
35969 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_MERGEABLE) \
35970 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DEPEND) \
35971 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_PRIORITY))
35973 static tree
35975 {
35986 }
35988 /* OpenMP 3.0:
35989 # pragma omp taskwait new-line */
35991 static void
35993 {
35996 }
35998 /* OpenMP 3.1:
35999 # pragma omp taskyield new-line */
36001 static void
36003 {
36006 }
36008 /* OpenMP 4.0:
36009 # pragma omp taskgroup new-line
36010 structured-block */
36012 static tree
36014 {
36018 if_p));
36019 }
36022 /* OpenMP 2.5:
36023 # pragma omp threadprivate (variable-list) */
36025 static void
36027 {
36028 tree vars;
36034 }
36036 /* OpenMP 4.0:
36037 # pragma omp cancel cancel-clause[optseq] new-line */
36039 #define OMP_CANCEL_CLAUSE_MASK \
36040 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_PARALLEL) \
36041 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_FOR) \
36042 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_SECTIONS) \
36043 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_TASKGROUP) \
36044 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_IF))
36046 static void
36048 {
36052 }
36054 /* OpenMP 4.0:
36055 # pragma omp cancellation point cancelpt-clause[optseq] new-line */
36057 #define OMP_CANCELLATION_POINT_CLAUSE_MASK \
36058 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_PARALLEL) \
36059 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_FOR) \
36060 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_SECTIONS) \
36061 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_TASKGROUP))
36063 static void
36066 {
36067 tree clauses;
36071 {
36076 {
36079 }
36080 }
36082 {
36086 }
36089 {
36094 else
36098 }
36101 OMP_CANCELLATION_POINT_CLAUSE_MASK,
36103 pragma_tok);
36105 }
36107 /* OpenMP 4.0:
36108 #pragma omp distribute distribute-clause[optseq] new-line
36109 for-loop */
36111 #define OMP_DISTRIBUTE_CLAUSE_MASK \
36112 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_PRIVATE) \
36113 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_FIRSTPRIVATE) \
36114 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_LASTPRIVATE) \
36115 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DIST_SCHEDULE)\
36116 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_COLLAPSE))
36118 static tree
36122 {
36131 {
36139 else
36142 {
36148 {
36152 else
36155 }
36161 else
36175 }
36176 }
36178 {
36181 }
36186 {
36189 }
36200 }
36202 /* OpenMP 4.0:
36203 # pragma omp teams teams-clause[optseq] new-line
36204 structured-block */
36206 #define OMP_TEAMS_CLAUSE_MASK \
36207 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_PRIVATE) \
36208 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_FIRSTPRIVATE) \
36209 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_SHARED) \
36210 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_REDUCTION) \
36211 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_NUM_TEAMS) \
36212 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_THREAD_LIMIT) \
36213 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DEFAULT))
36215 static tree
36219 {
36228 {
36232 {
36257 }
36258 }
36260 {
36263 }
36268 {
36271 }
36280 }
36282 /* OpenMP 4.0:
36283 # pragma omp target data target-data-clause[optseq] new-line
36284 structured-block */
36286 #define OMP_TARGET_DATA_CLAUSE_MASK \
36287 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DEVICE) \
36288 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_MAP) \
36289 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_IF) \
36290 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_USE_DEVICE_PTR))
36292 static tree
36294 {
36295 tree clauses
36300 {
36303 {
36320 "%<#pragma omp target data%> with map-type other "
36321 "than %<to%>, %<from%>, %<tofrom%> or %<alloc%> "
36325 }
36327 }
36330 {
36333 "%<#pragma omp target data%> must contain at least "
36336 }
36347 }
36349 /* OpenMP 4.5:
36350 # pragma omp target enter data target-enter-data-clause[optseq] new-line
36351 structured-block */
36353 #define OMP_TARGET_ENTER_DATA_CLAUSE_MASK \
36354 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DEVICE) \
36355 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_MAP) \
36356 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_IF) \
36357 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DEPEND) \
36358 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_NOWAIT))
36360 static tree
36363 {
36366 {
36371 {
36374 }
36375 }
36377 {
36381 }
36384 {
36390 }
36392 tree clauses
36397 {
36400 {
36413 "%<#pragma omp target enter data%> with map-type other "
36417 }
36419 }
36422 {
36425 "%<#pragma omp target enter data%> must contain at least "
36428 }
36435 }
36437 /* OpenMP 4.5:
36438 # pragma omp target exit data target-enter-data-clause[optseq] new-line
36439 structured-block */
36441 #define OMP_TARGET_EXIT_DATA_CLAUSE_MASK \
36442 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DEVICE) \
36443 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_MAP) \
36444 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_IF) \
36445 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DEPEND) \
36446 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_NOWAIT))
36448 static tree
36451 {
36454 {
36459 {
36462 }
36463 }
36465 {
36469 }
36472 {
36478 }
36480 tree clauses
36485 {
36488 {
36502 "%<#pragma omp target exit data%> with map-type other "
36503 "than %<from%>, %<release%> or %<delete%> on %<map%>"
36507 }
36509 }
36512 {
36515 "%<#pragma omp target exit data%> must contain at least "
36518 }
36525 }
36527 /* OpenMP 4.0:
36528 # pragma omp target update target-update-clause[optseq] new-line */
36530 #define OMP_TARGET_UPDATE_CLAUSE_MASK \
36531 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_FROM) \
36532 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_TO) \
36533 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DEVICE) \
36534 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_IF) \
36535 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DEPEND) \
36536 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_NOWAIT))
36538 static bool
36541 {
36543 {
36549 }
36551 tree clauses
36556 {
36558 "%<#pragma omp target update%> must contain at least one "
36561 }
36569 }
36571 /* OpenMP 4.0:
36572 # pragma omp target target-clause[optseq] new-line
36573 structured-block */
36575 #define OMP_TARGET_CLAUSE_MASK \
36576 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DEVICE) \
36577 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_MAP) \
36578 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_IF) \
36579 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DEPEND) \
36580 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_NOWAIT) \
36581 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_PRIVATE) \
36582 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_FIRSTPRIVATE) \
36583 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DEFAULTMAP) \
36584 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_IS_DEVICE_PTR))
36586 static bool
36589 {
36593 {
36605 {
36613 {
36614 tree stmt;
36616 {
36619 OMP_TARGET_CLAUSE_MASK,
36624 OMP_TARGET_CLAUSE_MASK,
36629 OMP_TARGET_CLAUSE_MASK,
36634 }
36636 }
36641 {
36645 if_p);
36650 if_p);
36655 if_p);
36659 }
36665 {
36666 /* For combined target teams, ensure the num_teams and
36667 thread_limit clause expressions are evaluated on the host,
36668 before entering the target construct. */
36669 tree c;
36675 {
36684 OMP_CLAUSE_FIRSTPRIVATE);
36689 }
36690 }
36700 }
36702 {
36705 }
36707 {
36711 }
36713 {
36717 }
36719 {
36723 }
36725 {
36728 }
36729 }
36731 {
36734 }
36749 check_clauses:
36751 {
36754 {
36768 "%<#pragma omp target%> with map-type other "
36769 "than %<to%>, %<from%>, %<tofrom%> or %<alloc%> "
36773 }
36775 }
36777 }
36779 /* OpenACC 2.0:
36780 # pragma acc cache (variable-list) new-line
36781 */
36783 static tree
36785 {
36800 }
36802 /* OpenACC 2.0:
36803 # pragma acc data oacc-data-clause[optseq] new-line
36804 structured-block */
36806 #define OACC_DATA_CLAUSE_MASK \
36807 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_COPY) \
36808 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_COPYIN) \
36809 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_COPYOUT) \
36810 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_CREATE) \
36811 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_DEVICEPTR) \
36812 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_IF) \
36813 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_PRESENT) )
36815 static tree
36817 {
36830 }
36832 /* OpenACC 2.0:
36833 # pragma acc host_data <clauses> new-line
36834 structured-block */
36836 #define OACC_HOST_DATA_CLAUSE_MASK \
36837 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_USE_DEVICE) )
36839 static tree
36841 {
36854 }
36856 /* OpenACC 2.0:
36857 # pragma acc declare oacc-data-clause[optseq] new-line
36858 */
36860 #define OACC_DECLARE_CLAUSE_MASK \
36861 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_COPY) \
36862 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_COPYIN) \
36863 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_COPYOUT) \
36864 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_CREATE) \
36865 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_DEVICEPTR) \
36866 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_DEVICE_RESIDENT) \
36867 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_LINK) \
36868 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_PRESENT) )
36870 static tree
36872 {
36881 {
36885 }
36888 {
36892 {
36896 }
36899 {
36911 {
36913 "%qD must be a global variable in "
36915 decl);
36918 }
36923 {
36927 }
36929 {
36931 "invalid use of %<extern%> variable %qD "
36935 }
36937 {
36939 "invalid use of %<global%> variable %qD "
36943 }
36945 }
36950 {
36955 }
36958 {
36959 tree id;
36963 else
36969 {
36972 {
36975 {
36979 }
36980 }
36981 }
36982 }
36983 }
36996 }
36998 /* OpenACC 2.0:
36999 # pragma acc enter data oacc-enter-data-clause[optseq] new-line
37001 or
37003 # pragma acc exit data oacc-exit-data-clause[optseq] new-line
37005 LOC is the location of the #pragma token.
37006 */
37008 #define OACC_ENTER_DATA_CLAUSE_MASK \
37009 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_IF) \
37010 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_ASYNC) \
37011 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_COPYIN) \
37012 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_CREATE) \
37013 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_WAIT) )
37015 #define OACC_EXIT_DATA_CLAUSE_MASK \
37016 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_IF) \
37017 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_ASYNC) \
37018 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_COPYOUT) \
37019 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_DELETE) \
37020 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_FINALIZE) \
37021 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_WAIT) )
37023 static tree
37026 {
37035 {
37040 }
37047 else
37052 {
37056 }
37064 }
37066 /* OpenACC 2.0:
37067 # pragma acc loop oacc-loop-clause[optseq] new-line
37068 structured-block */
37070 #define OACC_LOOP_CLAUSE_MASK \
37071 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_COLLAPSE) \
37072 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_PRIVATE) \
37073 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_REDUCTION) \
37074 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_GANG) \
37075 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_VECTOR) \
37076 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_WORKER) \
37077 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_AUTO) \
37078 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_INDEPENDENT) \
37079 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_SEQ) \
37080 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_TILE))
37082 static tree
37085 {
37094 {
37100 }
37109 }
37111 /* OpenACC 2.0:
37112 # pragma acc kernels oacc-kernels-clause[optseq] new-line
37113 structured-block
37115 or
37117 # pragma acc parallel oacc-parallel-clause[optseq] new-line
37118 structured-block
37119 */
37121 #define OACC_KERNELS_CLAUSE_MASK \
37122 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_ASYNC) \
37123 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_COPY) \
37124 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_COPYIN) \
37125 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_COPYOUT) \
37126 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_CREATE) \
37127 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_DEFAULT) \
37128 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_DEVICEPTR) \
37129 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_IF) \
37130 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_NUM_GANGS) \
37131 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_NUM_WORKERS) \
37132 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_PRESENT) \
37133 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_VECTOR_LENGTH) \
37134 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_WAIT) )
37136 #define OACC_PARALLEL_CLAUSE_MASK \
37137 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_ASYNC) \
37138 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_COPY) \
37139 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_COPYIN) \
37140 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_COPYOUT) \
37141 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_CREATE) \
37142 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_DEFAULT) \
37143 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_DEVICEPTR) \
37144 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_FIRSTPRIVATE) \
37145 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_IF) \
37146 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_NUM_GANGS) \
37147 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_NUM_WORKERS) \
37148 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_PRESENT) \
37149 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_PRIVATE) \
37150 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_REDUCTION) \
37151 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_VECTOR_LENGTH) \
37152 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_WAIT) )
37154 static tree
37157 {
37158 omp_clause_mask mask;
37161 {
37174 }
37177 {
37181 {
37184 tree clauses;
37186 if_p);
37188 }
37189 }
37198 }
37200 /* OpenACC 2.0:
37201 # pragma acc update oacc-update-clause[optseq] new-line
37202 */
37204 #define OACC_UPDATE_CLAUSE_MASK \
37205 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_ASYNC) \
37206 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_DEVICE) \
37207 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_HOST) \
37208 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_IF) \
37209 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_IF_PRESENT) \
37210 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_WAIT))
37212 static tree
37214 {
37221 {
37223 "%<#pragma acc update%> must contain at least one "
37226 }
37234 }
37236 /* OpenACC 2.0:
37237 # pragma acc wait [(intseq)] oacc-wait-clause[optseq] new-line
37239 LOC is the location of the #pragma token.
37240 */
37242 #define OACC_WAIT_CLAUSE_MASK \
37243 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_ASYNC))
37245 static tree
37247 {
37261 }
37263 /* OpenMP 4.0:
37264 # pragma omp declare simd declare-simd-clauses[optseq] new-line */
37266 #define OMP_DECLARE_SIMD_CLAUSE_MASK \
37267 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_SIMDLEN) \
37268 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_LINEAR) \
37269 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_ALIGNED) \
37270 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_UNIFORM) \
37271 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_INBRANCH) \
37272 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_NOTINBRANCH))
37274 static void
37277 {
37279 cp_omp_declare_simd_data data;
37281 {
37286 /* It is safe to take the address of a local variable; it will only be
37287 used while this scope is live. */
37289 }
37291 /* Store away all pragma tokens. */
37303 {
37307 {
37320 }
37325 "%<#pragma omp declare simd%> not immediately followed by "
37329 }
37330 }
37332 /* Finalize #pragma omp declare simd clauses after direct declarator has
37333 been parsed, and put that into "omp declare simd" attribute. */
37335 static tree
37337 {
37343 {
37347 }
37352 {
37370 }
37374 }
37377 /* OpenMP 4.0:
37378 # pragma omp declare target new-line
37379 declarations and definitions
37380 # pragma omp end declare target new-line
37382 OpenMP 4.5:
37383 # pragma omp declare target ( extended-list ) new-line
37385 # pragma omp declare target declare-target-clauses[seq] new-line */
37387 #define OMP_DECLARE_TARGET_CLAUSE_MASK \
37388 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_TO) \
37389 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_LINK))
37391 static void
37393 {
37396 clauses
37400 {
37402 clauses);
37405 }
37406 else
37407 {
37411 }
37414 "%<#pragma omp declare target%> with clauses in between "
37415 "%<#pragma omp declare target%> without clauses and "
37418 {
37424 {
37427 }
37428 else
37431 {
37433 "%qD specified both in declare target %<link%> and %<to%>"
37436 }
37438 {
37445 {
37448 {
37452 }
37453 }
37454 }
37455 }
37456 }
37458 static void
37460 {
37463 {
37466 }
37468 {
37472 {
37475 }
37478 else
37479 {
37483 }
37484 }
37485 else
37486 {
37490 }
37494 "%<#pragma omp end declare target%> without corresponding "
37496 else
37498 }
37500 /* Helper function of cp_parser_omp_declare_reduction. Parse the combiner
37501 expression and optional initializer clause of
37502 #pragma omp declare reduction. We store the expression(s) as
37503 either 3, 6 or 7 special statements inside of the artificial function's
37504 body. The first two statements are DECL_EXPRs for the artificial
37505 OMP_OUT resp. OMP_IN variables, followed by a statement with the combiner
37506 expression that uses those variables.
37507 If there was any INITIALIZER clause, this is followed by further statements,
37508 the fourth and fifth statements are DECL_EXPRs for the artificial
37509 OMP_PRIV resp. OMP_ORIG variables. If the INITIALIZER clause wasn't the
37510 constructor variant (first token after open paren is not omp_priv),
37511 then the sixth statement is a statement with the function call expression
37512 that uses the OMP_PRIV and optionally OMP_ORIG variable.
37513 Otherwise, the sixth statement is whatever statement cp_finish_decl emits
37514 to initialize the OMP_PRIV artificial variable and there is seventh
37515 statement, a DECL_EXPR of the OMP_PRIV statement again. */
37517 static bool
37519 {
37531 tree combiner;
37546 {
37549 }
37552 {
37554 matching_parens parens;
37560 {
37563 }
37579 {
37583 /* Reject initializer (omp_priv) and initializer (omp_priv ()). */
37587 == CPP_CLOSE_PAREN
37590 {
37594 }
37599 }
37600 else
37601 {
37617 {
37622 }
37624 tree arg;
37637 }
37648 }
37652 UNKNOWN_LOCATION);
37655 }
37657 /* OpenMP 4.0
37658 #pragma omp declare reduction (reduction-id : typename-list : expression) \
37659 initializer-clause[opt] new-line
37661 initializer-clause:
37662 initializer (omp_priv initializer)
37663 initializer (function-name (argument-list)) */
37665 static void
37668 {
37678 /* Get the high-water mark for the DECLARATOR_OBSTACK. */
37685 {
37717 }
37729 /* Types may not be defined in declare reduction type list. */
37732 parser->type_definition_forbidden_message
37738 saved_colon_doesnt_start_class_def_p
37743 {
37747 ;
37766 else
37771 else
37773 }
37775 /* Restore the saved message. */
37778 parser->colon_doesnt_start_class_def_p
37783 {
37784 fail:
37787 }
37793 {
37794 tree fntype
37797 NULL_TREE);
37817 {
37822 }
37824 {
37826 {
37835 }
37842 }
37843 else
37844 {
37847 }
37850 else
37853 {
37856 }
37858 {
37861 else
37866 }
37871 else
37872 {
37881 }
37888 }
37892 done:
37893 /* Free any declarators allocated. */
37895 }
37897 /* OpenMP 4.0
37898 #pragma omp declare simd declare-simd-clauses[optseq] new-line
37899 #pragma omp declare reduction (reduction-id : typename-list : expression) \
37900 initializer-clause[opt] new-line
37901 #pragma omp declare target new-line */
37903 static bool
37906 {
37908 {
37913 {
37916 context);
37918 }
37921 {
37924 context);
37926 }
37928 {
37931 }
37933 {
37937 }
37938 }
37943 }
37945 /* OpenMP 4.5:
37946 #pragma omp taskloop taskloop-clause[optseq] new-line
37947 for-loop
37949 #pragma omp taskloop simd taskloop-simd-clause[optseq] new-line
37950 for-loop */
37952 #define OMP_TASKLOOP_CLAUSE_MASK \
37953 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_SHARED) \
37954 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_PRIVATE) \
37955 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_FIRSTPRIVATE) \
37956 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_LASTPRIVATE) \
37957 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DEFAULT) \
37958 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_GRAINSIZE) \
37959 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_NUM_TASKS) \
37960 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_COLLAPSE) \
37961 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_UNTIED) \
37962 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_IF) \
37963 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_FINAL) \
37964 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_MERGEABLE) \
37965 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_NOGROUP) \
37966 | (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_PRIORITY))
37968 static tree
37972 {
37981 {
37986 {
38010 }
38011 }
38013 {
38016 }
38021 {
38024 }
38030 if_p);
38036 }
38039 /* OpenACC 2.0:
38040 # pragma acc routine oacc-routine-clause[optseq] new-line
38041 function-definition
38043 # pragma acc routine ( name ) oacc-routine-clause[optseq] new-line
38044 */
38046 #define OACC_ROUTINE_CLAUSE_MASK \
38047 ( (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_GANG) \
38048 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_WORKER) \
38049 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_VECTOR) \
38050 | (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_SEQ))
38053 /* Parse the OpenACC routine pragma. This has an optional '( name )'
38054 component, which must resolve to a declared namespace-scope
38055 function. The clauses are either processed directly (for a named
38056 function), or defered until the immediatley following declaration
38057 is parsed. */
38059 static void
38062 {
38064 /* The checking for "another pragma following this one" in the "no optional
38065 '( name )'" case makes sure that we dont re-enter. */
38068 cp_oacc_routine_data data;
38074 /* It is safe to take the address of a local variable; it will only be
38075 used while this scope is live. */
38078 /* Look for optional '( name )'. */
38080 {
38081 matching_parens parens;
38084 /* We parse the name as an id-expression. If it resolves to
38085 anything other than a non-overloaded function at namespace
38086 scope, it's an error. */
38102 {
38106 }
38108 data.clauses
38116 {
38121 }
38123 /* Perhaps we should use the same rule as declarations in different
38124 namespaces? */
38126 {
38131 }
38134 {
38138 }
38142 }
38144 {
38145 /* Store away all pragma tokens. */
38156 /* Emit a helpful diagnostic if there's another pragma following this
38157 one. */
38159 {
38162 /* ..., and then just keep going. */
38164 }
38166 /* We only have to consider the pragma_external case here. */
38171 else
38174 }
38175 }
38177 /* Finalize #pragma acc routine clauses after direct declarator has
38178 been parsed. */
38180 static tree
38182 {
38187 {
38189 "%<#pragma acc routine%> not immediately followed by "
38192 }
38209 /* Later, cp_finalize_oacc_routine will process the clauses, and then set
38210 fndecl_seen. */
38213 }
38215 /* Apply any saved OpenACC routine clauses to a just-parsed
38216 declaration. */
38218 static void
38220 {
38222 {
38223 /* Keep going if we're in error reporting mode. */
38229 {
38231 "%<#pragma acc routine%> not immediately followed by"
38235 }
38237 {
38240 }
38243 {
38248 }
38251 {
38259 }
38261 /* Process the routine's dimension clauses. */
38265 /* Add an "omp declare target" attribute. */
38270 /* Don't unset parser->oacc_routine here: we may still need it to
38271 diagnose wrong usage. But, remember that we've used this "#pragma acc
38272 routine". */
38274 }
38275 }
38277 /* Main entry point to OpenMP statement pragmas. */
38279 static void
38281 {
38282 tree stmt;
38287 {
38310 if_p);
38315 if_p);
38332 if_p);
38337 if_p);
38345 if_p);
38354 if_p);
38368 if_p);
38373 if_p);
38377 }
38380 }
38381 \f
38382 /* Transactional Memory parsing routines. */
38384 /* Parse a transaction attribute.
38386 txn-attribute:
38387 attribute
38388 [ [ identifier ] ]
38390 We use this instead of cp_parser_attributes_opt for transactions to avoid
38391 the pedwarn in C++98 mode. */
38393 static tree
38395 {
38410 {
38414 /* For keywords, use the canonical spelling,
38415 not the parsed identifier. */
38419 }
38420 else
38424 error1:
38427 }
38429 /* Parse a __transaction_atomic or __transaction_relaxed statement.
38431 transaction-statement:
38432 __transaction_atomic txn-attribute[opt] txn-noexcept-spec[opt]
38433 compound-statement
38434 __transaction_relaxed txn-noexcept-spec[opt] compound-statement
38435 */
38437 static tree
38439 {
38450 else
38451 {
38455 }
38457 /* Parse a noexcept specification. */
38461 {
38462 /* cancel-and-throw is unimplemented. */
38465 }
38466 else
38469 /* Keep track if we're in the lexical scope of an outer transaction. */
38481 }
38483 /* Parse a __transaction_atomic or __transaction_relaxed expression.
38485 transaction-expression:
38486 __transaction_atomic txn-noexcept-spec[opt] ( expression )
38487 __transaction_relaxed txn-noexcept-spec[opt] ( expression )
38488 */
38490 static tree
38492 {
38505 keyword == RID_TRANSACTION_RELAXED
38519 /* Set this early. This might mean that we allow transaction_cancel in
38520 an expression that we find out later actually has to be a constexpr.
38521 However, we expect that cxx_constant_value will be able to deal with
38522 this; also, if the noexcept has no constexpr, then what we parse next
38523 really is a transaction's body. */
38526 /* Parse a noexcept specification. */
38532 {
38533 matching_parens parens;
38540 }
38541 else
38542 {
38543 /* The only expression that is available got parsed for the noexcept
38544 already. noexcept is true then. */
38547 }
38556 }
38558 /* Parse a function-transaction-block.
38560 function-transaction-block:
38561 __transaction_atomic txn-attribute[opt] ctor-initializer[opt]
38562 function-body
38563 __transaction_atomic txn-attribute[opt] function-try-block
38564 __transaction_relaxed ctor-initializer[opt] function-body
38565 __transaction_relaxed function-try-block
38566 */
38568 static void
38570 {
38585 else
38586 {
38590 }
38598 else
38599 cp_parser_ctor_initializer_opt_and_function_body
38605 }
38607 /* Parse a __transaction_cancel statement.
38609 cancel-statement:
38610 __transaction_cancel txn-attribute[opt] ;
38611 __transaction_cancel txn-attribute[opt] throw-expression ;
38613 ??? Cancel and throw is not yet implemented. */
38615 static tree
38617 {
38623 RT_TRANSACTION_CANCEL);
38630 /* ??? Parse cancel-and-throw here. */
38635 {
38639 }
38641 {
38645 }
38647 {
38650 {
38656 }
38657 }
38659 {
38663 }
38669 }
38670 \f
38671 /* The parser. */
38675 \f
38676 /* Special handling for the first token or line in the file. The first
38677 thing in the file might be #pragma GCC pch_preprocess, which loads a
38678 PCH file, which is a GC collection point. So we need to handle this
38679 first pragma without benefit of an existing lexer structure.
38681 Always returns one token to the caller in *FIRST_TOKEN. This is
38682 either the true first token of the file, or the first token after
38683 the initial pragma. */
38685 static void
38687 {
38696 {
38703 }
38704 else
38707 /* Skip to the end of the pragma. */
38711 /* Now actually load the PCH file. */
38715 /* Read one more token to return to our caller. We have to do this
38716 after reading the PCH file in, since its pointers have to be
38717 live. */
38719 }
38721 /* Parse a pragma GCC ivdep. */
38723 static bool
38725 {
38728 }
38730 /* Parse a pragma GCC unroll. */
38732 static unsigned short
38734 {
38744 {
38746 " assignment-expression that evaluates to a non-negative"
38749 }
38750 else
38751 {
38755 }
38758 }
38760 /* Normal parsing of a pragma token. Here we can (and must) use the
38761 regular lexer. */
38763 static bool
38765 {
38768 tree stmt;
38779 {
38787 {
38797 }
38802 {
38812 }
38817 {
38828 }
38833 {
38844 }
38849 {
38860 }
38880 {
38885 }
38893 {
38898 }
38906 {
38910 }
38916 {
38921 }
38929 {
38934 }
38989 "%<#pragma omp section%> may only be used in "
38994 {
38996 {
39000 }
39006 {
39010 }
39011 else
39017 {
39020 }
39023 }
39026 {
39028 {
39032 }
39033 const unsigned short unroll
39039 {
39043 }
39044 else
39050 {
39053 }
39056 }
39063 bad_stmt:
39066 }
39070 }
39072 /* The interface the pragma parsers have to the lexer. */
39074 enum cpp_ttype
39076 {
39088 else
39089 {
39093 }
39096 }
39098 \f
39099 /* External interface. */
39101 /* Parse one entire translation unit. */
39103 void
39105 {
39118 }
39120 /* Create an identifier for a generic parameter type (a synthesized
39121 template parameter implied by `auto' or a concept identifier). */
39124 static tree
39126 {
39130 }
39132 /* Add an implicit template type parameter to the CURRENT_TEMPLATE_PARMS
39133 (creating a new template parameter list if necessary). Returns the newly
39134 created template type parm. */
39136 static tree
39138 {
39141 /* Before committing to modifying any scope, if we're in an
39142 implicit template scope, and we're trying to synthesize a
39143 constrained parameter, try to find a previous parameter with
39144 the same name. This is the same-type rule for abbreviated
39145 function templates.
39147 NOTE: We can generate implicit parameters when tentatively
39148 parsing a nested name specifier, only to reject that parse
39149 later. However, matching the same template-id as part of a
39150 direct-declarator should generate an identical template
39151 parameter, so this rule will merge them. */
39153 {
39156 {
39158 {
39161 /* Return the TEMPLATE_PARM_INDEX. */
39164 }
39166 }
39167 }
39169 /* We are either continuing a function template that already contains implicit
39170 template parameters, creating a new fully-implicit function template, or
39171 extending an existing explicit function template with implicit template
39172 parameters. */
39180 {
39184 }
39185 else
39186 {
39187 /* Roll back to the existing template parameter scope (in the case of
39188 extending an explicit function template) or introduce a new template
39189 parameter scope ahead of the function parameter scope (or class scope
39190 in the case of out-of-line member definitions). The function scope is
39191 added back after template parameter synthesis below. */
39196 {
39199 }
39201 {
39202 /* If not defining a class, then any class scope is a scope level in
39203 an out-of-line member definition. In this case simply wind back
39204 beyond the first such scope to inject the template parameter list.
39205 Otherwise wind back to the class being defined. The latter can
39206 occur in class member friend declarations such as:
39208 class A {
39209 void foo (auto);
39210 };
39211 class B {
39212 friend void A::foo (auto);
39213 };
39215 The template parameter list synthesized for the friend declaration
39216 must be injected in the scope of 'B'. This can also occur in
39217 erroneous cases such as:
39219 struct A {
39220 struct B {
39221 void foo (auto);
39222 };
39223 void B::foo (auto) {}
39224 };
39226 Here the attempted definition of 'B::foo' within 'A' is ill-formed
39227 but, nevertheless, the template parameter list synthesized for the
39228 declarator should be injected into the scope of 'A' as if the
39229 ill-formed template was specified explicitly. */
39232 {
39235 }
39236 }
39242 {
39243 /* Introduce a new template parameter list for implicit template
39244 parameters. */
39248 parser->implicit_template_scope
39255 }
39256 else
39257 {
39258 /* Synthesize implicit template parameters at the end of the explicit
39259 template parameter list. */
39266 parser->implicit_template_parms
39268 }
39269 }
39271 /* Synthesize a new template parameter and track the current template
39272 parameter chain with implicit_template_parms. */
39276 tree synth_tmpl_parm;
39280 synth_tmpl_parm
39283 synth_tmpl_parm
39285 else
39286 {
39290 }
39292 // Attach the constraint to the parm before processing.
39295 tree new_parm
39297 input_location,
39298 node,
39302 // Chain the new parameter to the list of implicit parameters.
39304 parser->implicit_template_parms
39306 else
39311 /* Return the TEMPLATE_PARM_INDEX, not the PARM_DECL. */
39314 /* If creating a fully implicit function template, start the new implicit
39315 template parameter list with this synthesized type, otherwise grow the
39316 current template parameter list. */
39319 {
39326 }
39327 else
39328 {
39333 }
39335 // If the new parameter was constrained, we need to add that to the
39336 // constraints in the template parameter list.
39338 {
39342 }
39347 }
39349 /* Finish the declaration of a fully implicit function template. Such a
39350 template has no explicit template parameter list so has not been through the
39351 normal template head and tail processing. synthesize_implicit_template_parm
39352 tries to do the head; this tries to do the tail. MEMBER_DECL_OPT should be
39353 provided if the declaration is a class member such that its template
39354 declaration can be completed. If MEMBER_DECL_OPT is provided the finished
39355 form is returned. Otherwise NULL_TREE is returned. */
39357 static tree
39359 {
39364 {
39368 }
39380 }
39382 /* Like finish_fully_implicit_template, but to be used in error
39383 recovery, rearranging scopes so that we restore the state we had
39384 before synthesize_implicit_template_parm inserted the implement
39385 template parms scope. */
39387 static void
39389 {
39394 {
39403 }
39404 else
39410 }
39412 /* Helper function for diagnostics that have complained about things
39413 being used with 'extern "C"' linkage.
39415 Attempt to issue a note showing where the 'extern "C"' linkage began. */
39417 void
39419 {
39423 }