| blob | 5ebfaaf85e6e24bebf3d16645a72a55473dd8d2c |
1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988-2018 Free Software Foundation, Inc.
3 Contributed by Michael Tiemann (tiemann@cygnus.com)
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify
8 it 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,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU 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 /* Process declarations and symbol lookup for C++ front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
57 /* Possible cases of bad specifiers type used by bad_specifiers. */
62 BSP_FIELD /* field */
63 };
98 static tree check_special_function_return_type
106 /* The following symbols are subsumed in the cp_global_trees array, and
107 listed here individually for documentation purposes.
109 C++ extensions
110 tree wchar_decl_node;
112 tree vtable_entry_type;
113 tree delta_type_node;
114 tree __t_desc_type_node;
116 tree class_type_node;
117 tree unknown_type_node;
119 Array type `vtable_entry_type[]'
121 tree vtbl_type_node;
122 tree vtbl_ptr_type_node;
124 Namespaces,
126 tree std_node;
127 tree abi_node;
129 A FUNCTION_DECL which can call `abort'. Not necessarily the
130 one that the user will declare, but sufficient to be called
131 by routines that want to abort the program.
133 tree abort_fndecl;
135 Used by RTTI
136 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
137 tree tinfo_var_id; */
141 #define local_names cp_function_chain->x_local_names
143 /* A list of objects which have constructors or destructors
144 which reside in the global scope. The decl is stored in
145 the TREE_VALUE slot and the initializer is stored
146 in the TREE_PURPOSE slot. */
147 tree static_aggregates;
149 /* Like static_aggregates, but for thread_local variables. */
150 tree tls_aggregates;
152 /* -- end of C++ */
154 /* A node for the integer constant 2. */
156 tree integer_two_node;
158 /* vector of static decls. */
161 /* vector of keyed classes. */
164 /* Used only for jumps to as-yet undefined labels, since jumps to
165 defined labels can have their validity checked immediately. */
169 /* The binding level to which this entry is *currently* attached.
170 This is initially the binding level in which the goto appeared,
171 but is modified as scopes are closed. */
173 /* The head of the names list that was current when the goto appeared,
174 or the inner scope popped. These are the decls that will *not* be
175 skipped when jumping to the label. */
176 tree names_in_scope;
177 /* The location of the goto, for error reporting. */
178 location_t o_goto_locus;
179 /* True if an OpenMP structured block scope has been closed since
180 the goto appeared. This means that the branch from the label will
181 illegally exit an OpenMP scope. */
183 };
185 /* A list of all LABEL_DECLs in the function that have names. Here so
186 we can clear out their names' definitions at the end of the
187 function, and so we can check the validity of jumps to these labels. */
197 /* The binding level to which the label is *currently* attached.
198 This is initially set to the binding level in which the label
199 is defined, but is modified as scopes are closed. */
202 /* The head of the names list that was current when the label was
203 defined, or the inner scope popped. These are the decls that will
204 be skipped when jumping to the label. */
205 tree names_in_scope;
207 /* A vector of all decls from all binding levels that would be
208 crossed by a backward branch to the label. */
211 /* A list of uses of the label, before the label is defined. */
214 /* The following bits are set after the label is defined, and are
215 updated as scopes are popped. They indicate that a jump to the
216 label will illegally enter a scope of the given flavor. */
222 };
224 #define named_labels cp_function_chain->x_named_labels
225 \f
226 /* The number of function bodies which we are currently processing.
227 (Zero if we are at namespace scope, one inside the body of a
228 function, two inside the body of a function in a local class, etc.) */
231 /* Whether the exception-specifier is part of a function type (i.e. C++17). */
234 /* States indicating how grokdeclarator() should handle declspecs marked
235 with __attribute__((deprecated)). An object declared as
236 __attribute__((deprecated)) suppresses warnings of uses of other
237 deprecated items. */
240 \f
241 /* A list of VAR_DECLs whose type was incomplete at the time the
242 variable was declared. */
245 tree decl;
246 tree incomplete_type;
247 };
251 \f
252 /* Returns the kind of template specialization we are currently
253 processing, given that it's declaration contained N_CLASS_SCOPES
254 explicit scope qualifications. */
256 tmpl_spec_kind
258 {
264 /* Scan through the template parameter scopes. */
268 {
269 /* If we see a specialization scope inside a parameter scope,
270 then something is wrong. That corresponds to a declaration
271 like:
273 template <class T> template <> ...
275 which is always invalid since [temp.expl.spec] forbids the
276 specialization of a class member template if the enclosing
277 class templates are not explicitly specialized as well. */
279 {
282 else
284 }
289 }
291 /* Handle explicit instantiations. */
293 {
295 /* We've seen a template parameter list during an explicit
296 instantiation. For example:
298 template <class T> template void f(int);
300 This is erroneous. */
302 else
304 }
307 /* We've not seen enough template headers to match all the
308 specialized classes present. For example:
310 template <class T> void R<T>::S<T>::f(int);
312 This is invalid; there needs to be one set of template
313 parameters for each class. */
316 /* We're processing a non-template declaration (even though it may
317 be a member of a template class.) For example:
319 template <class T> void S<T>::f(int);
321 The `class T' matches the `S<T>', leaving no template headers
322 corresponding to the `f'. */
325 /* We've got too many template headers. For example:
327 template <> template <class T> void f (T);
329 There need to be more enclosing classes. */
331 else
332 /* This must be a template. It's of the form:
334 template <class T> template <class U> void S<T>::f(U);
336 This is a specialization if the innermost level was a
337 specialization; otherwise it's just a definition of the
338 template. */
340 }
342 /* Exit the current scope. */
344 void
346 {
348 }
350 /* When a label goes out of scope, check to see if that label was used
351 in a valid manner, and issue any appropriate warnings or errors. */
353 static void
355 {
357 {
359 {
360 location_t location;
364 /* FIXME want (LOCATION_FILE (input_location), (line)0) */
365 /* Avoid crashing later. */
367 }
368 else
370 }
371 }
373 /* Helper function to sort named label entries in a vector by DECL_UID. */
375 static int
377 {
381 /* DECL_UIDs can never be equal. */
383 }
385 /* At the end of a function, all labels declared within the function
386 go out of scope. BLOCK is the top-level block for the
387 function. */
389 static void
391 {
395 /* We need to add the labels to the block chain, so debug
396 information is emitted. But, we want the order to be stable so
397 need to sort them first. Otherwise the debug output could be
398 randomly ordered. I guess it's mostly stable, unless the hash
399 table implementation changes. */
404 {
411 }
416 {
423 }
424 }
426 /* At the end of a block with local labels, restore the outer definition. */
428 static void
430 {
438 else
439 {
442 }
444 }
446 /* The following two routines are used to interface to Objective-C++.
447 The binding level is purposely treated as an opaque type. */
451 {
453 }
455 /* The following routine is used by the NeXT-style SJLJ exceptions;
456 variables get marked 'volatile' so as to not be clobbered by
457 _setjmp()/_longjmp() calls. All variables in the current scope,
458 as well as parent scopes up to (but not including) ENCLOSING_BLK
459 shall be thusly marked. */
461 void
463 {
469 {
470 tree decl;
475 /* Do not climb up past the current function. */
478 }
479 }
481 /* True if B is the level for the condition of a constexpr if. */
483 static bool
485 {
489 }
491 /* Update data for defined and undefined labels when leaving a scope. */
493 int
495 {
500 {
501 tree decl;
503 /* ENT->NAMES_IN_SCOPE may contain a mixture of DECLs and
504 TREE_LISTs representing OVERLOADs, so be careful. */
514 {
533 }
534 }
536 {
541 {
546 }
547 }
550 }
552 /* Saved errorcount to avoid -Wunused-but-set-{parameter,variable} warnings
553 when errors were reported, except for -Werror-unused-but-set-*. */
556 /* Exit a binding level.
557 Pop the level off, and restore the state of the identifier-decl mappings
558 that were in effect when this level was entered.
560 If KEEP == 1, this level had explicit declarations, so
561 and create a "block" (a BLOCK node) for the level
562 to record its declarations and subblocks for symbol table output.
564 If FUNCTIONBODY is nonzero, this level is the body of a function,
565 so create a block as if KEEP were set and also clear out all
566 label names.
568 If REVERSE is nonzero, reverse the order of decls before putting
569 them into the BLOCK. */
571 tree
573 {
574 tree link;
575 /* The chain of decls was accumulated in reverse order.
576 Put it into forward order, just for cleanliness. */
577 tree decls;
578 tree subblocks;
579 tree block;
580 tree decl;
581 scope_kind kind;
584 restart:
597 /* We used to use KEEP == 2 to indicate that the new block should go
598 at the beginning of the list of blocks at this binding level,
599 rather than the end. This hack is no longer used. */
605 /* Any uses of undefined labels, and any defined labels, now operate
606 under constraints of next binding contour. */
611 /* Get the decls in the order they were written.
612 Usually current_binding_level->names is in reverse order.
613 But parameter decls were previously put in forward order. */
617 {
620 }
622 /* If there were any declarations or structure tags in that level,
623 or if this level is a function body,
624 create a BLOCK to record them for the life of this function. */
626 /* Avoid function body block if possible. */
632 {
635 }
637 /* In each subblock, record that this is its superior. */
642 /* Before we remove the declarations first check for unused variables. */
647 {
648 /* There are cases where D itself is a TREE_LIST. See in
649 push_local_binding where the list of decls returned by
650 getdecls is built. */
657 /* For structured bindings, consider only real variables, not
658 subobjects. */
666 {
668 {
671 OPT_Wunused_variable,
673 else
676 }
678 // For -Wunused-but-set-variable leave references alone.
681 {
686 else
688 OPT_Wunused_but_set_variable,
691 }
692 }
693 }
695 /* Remove declarations for all the DECLs in this level. */
697 {
701 /* Remove the binding. */
704 else
706 }
708 /* Restore the IDENTIFIER_TYPE_VALUEs. */
713 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
714 list if a `using' declaration put them there. The debugging
715 back ends won't understand OVERLOAD, so we remove them here.
716 Because the BLOCK_VARS are (temporarily) shared with
717 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
718 popped all the bindings. Also remove undeduced 'auto' decls,
719 which LTO doesn't understand, and can't have been used by anything. */
721 {
725 {
727 || (!processing_template_decl
730 else
732 }
733 }
735 /* If the level being exited is the top level of a function,
736 check over all the labels. */
738 {
740 {
741 /* Since this is the top level block of a function, the vars are
742 the function's parameters. Don't leave them in the BLOCK
743 because they are found in the FUNCTION_DECL instead. */
746 }
747 else
749 }
753 {
754 tree stmt;
756 /* If this is a temporary binding created for a cleanup, then we'll
757 have pushed a statement list level. Pop that, create a new
758 BIND_EXPR for the block, and insert it into the stream. */
762 }
766 {
767 /* The current function is being defined, so its DECL_INITIAL
768 should be error_mark_node. */
772 {
774 {
777 }
778 else
780 }
781 }
783 current_binding_level->blocks
786 /* If we did not make a block for the level just exited,
787 any blocks made for inner levels
788 (since they cannot be recorded as subblocks in that level)
789 must be carried forward so they will later become subblocks
790 of something else. */
792 current_binding_level->blocks
795 /* Each and every BLOCK node created here in `poplevel' is important
796 (e.g. for proper debugging information) so if we created one
797 earlier, mark it as "used". */
801 /* All temporary bindings created for cleanups are popped silently. */
807 }
809 /* Call wrapup_globals_declarations for the globals in NAMESPACE. */
810 /* Diagnose odr-used extern inline variables without definitions
811 in the current TU. */
813 int
815 {
817 {
818 tree decl;
821 {
831 OPT_Wunused_function,
840 }
842 /* Clear out the list, so we don't rescan next time. */
845 /* Write out any globals that need to be output. */
848 }
850 }
851 \f
852 /* In C++, you don't have to write `struct S' to refer to `S'; you
853 can just use `S'. We accomplish this by creating a TYPE_DECL as
854 if the user had written `typedef struct S S'. Create and return
855 the TYPE_DECL for TYPE. */
857 tree
859 {
860 tree decl;
864 /* There are other implicit type declarations, like the one *within*
865 a class that allows you to write `S::S'. We must distinguish
866 amongst these. */
872 }
874 /* Remember a local name for name-mangling purposes. */
876 static void
878 {
888 {
891 {
896 else
902 }
903 }
907 }
908 \f
909 /* Subroutine of duplicate_decls: return truthvalue of whether
910 or not types of these decls match.
912 For C++, we must compare the parameter list so that `int' can match
913 `int&' in a parameter position, but `int&' is not confused with
914 `const int&'. */
916 int
918 {
925 /* If the two DECLs are not even the same kind of thing, we're not
926 interested in their types. */
932 {
937 tree r2;
939 /* Specializations of different templates are different functions
940 even if they have the same type. */
955 /* A new declaration doesn't match a built-in one unless it
956 is also extern "C". */
964 /* A declaration with deduced return type should use its pre-deduction
965 type for declaration matching. */
969 {
972 {
976 }
977 else
978 types_match =
984 }
985 else
988 /* The decls dont match if they correspond to two different versions
989 of the same function. Disallow extern "C" functions to be
990 versions for now. */
994 && record_versions
999 }
1001 {
1015 else
1016 // We don't need to check equivalently_constrained for variable and
1017 // function templates because we check it on the results.
1019 }
1020 else
1021 {
1022 /* Need to check scope for variable declaration (VAR_DECL).
1023 For typedef (TYPE_DECL), scope is ignored. */
1026 /* [dcl.link]
1027 Two declarations for an object with C language linkage
1028 with the same name (ignoring the namespace that qualify
1029 it) that appear in different namespace scopes refer to
1030 the same object. */
1040 else
1043 COMPARE_REDECLARATION);
1044 }
1046 // Normal functions can be constrained, as can variable partial
1047 // specializations.
1052 }
1054 /* NEWDECL and OLDDECL have identical signatures. If they are
1055 different versions adjust them and return true.
1056 If RECORD is set to true, record function versions. */
1058 bool
1060 {
1065 {
1069 }
1072 {
1076 }
1082 }
1084 /* If NEWDECL is `static' and an `extern' was seen previously,
1085 warn about it. OLDDECL is the previous declaration.
1087 Note that this does not apply to the C++ case of declaring
1088 a variable `extern const' and then later `const'.
1090 Don't complain about built-in functions, since they are beyond
1091 the user's control. */
1093 void
1095 {
1102 /* Don't get confused by static member functions; that's a different
1103 use of `static'. */
1108 /* If the old declaration was `static', or the new one isn't, then
1109 everything is OK. */
1113 /* It's OK to declare a builtin function as `static'. */
1118 auto_diagnostic_group d;
1123 }
1125 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1126 function templates. If their exception specifications do not
1127 match, issue a diagnostic. */
1129 static void
1131 tree old_decl)
1132 {
1136 /* Two default specs are equivalent, don't force evaluation. */
1142 {
1145 }
1149 /* [except.spec]
1151 If any declaration of a function has an exception-specification,
1152 all declarations, including the definition and an explicit
1153 specialization, of that function shall have an
1154 exception-specification with the same set of type-ids. */
1157 {
1162 auto_diagnostic_group d;
1166 /* We used to silently permit mismatched eh specs with
1167 -fno-exceptions, so make them a pedwarn now. */
1169 else
1174 }
1175 }
1177 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1178 Otherwise issue diagnostics. */
1180 static bool
1182 {
1192 {
1194 {
1195 /* Hide a built-in declaration. */
1199 }
1200 /* 7.1.5 [dcl.constexpr]
1201 Note: An explicit specialization can differ from the template
1202 declaration with respect to the constexpr specifier. */
1208 "redeclaration %qD differs in %<constexpr%> "
1213 }
1215 }
1217 // If OLDDECL and NEWDECL are concept declarations with the same type
1218 // (i.e., and template parameters), but different requirements,
1219 // emit diagnostics and return true. Otherwise, return false.
1222 {
1234 {
1239 {
1242 }
1243 }
1245 }
1247 /* DECL is a redeclaration of a function or function template. If
1248 it does have default arguments issue a diagnostic. Note: this
1249 function is used to enforce the requirements in C++11 8.3.6 about
1250 no default arguments in redeclarations. */
1252 static void
1254 {
1260 {
1262 "redeclaration of %q#D may not have default "
1265 }
1266 }
1268 /* NEWDECL is a redeclaration of a function or function template OLDDECL,
1269 in any case represented as FUNCTION_DECLs (the DECL_TEMPLATE_RESULTs of
1270 the TEMPLATE_DECLs in case of function templates). This function is used
1271 to enforce the final part of C++17 11.3.6/4, about a single declaration:
1272 "If a friend declaration specifies a default argument expression, that
1273 declaration shall be a definition and shall be the only declaration of
1274 the function or function template in the translation unit." */
1276 static void
1279 {
1290 {
1291 auto_diagnostic_group d;
1293 "friend declaration of %q#D specifies default "
1298 }
1299 }
1301 /* Merge tree bits that correspond to attributes noreturn, nothrow,
1302 const, malloc, and pure from NEWDECL with those of OLDDECL. */
1304 static void
1306 {
1319 }
1321 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1323 DECL_ATTRIBUTES (fn)))
1325 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1326 If the redeclaration is invalid, a diagnostic is issued, and the
1327 error_mark_node is returned. Otherwise, OLDDECL is returned.
1329 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1330 returned.
1332 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1334 tree
1336 {
1341 tree new_template_info;
1350 /* If either the type of the new decl or the type of the old decl is an
1351 error_mark_node, then that implies that we have already issued an
1352 error (earlier) for some bogus type specification, and in that case,
1353 it is rather pointless to harass the user with yet more error message
1354 about the same declaration, so just pretend the types match here. */
1363 {
1368 "literal operator template %qD conflicts with"
1374 "raw literal operator %qD conflicts with"
1376 }
1378 /* True to merge attributes between the declarations, false to
1379 set OLDDECL's attributes to those of NEWDECL (for template
1380 explicit specializations that specify their own attributes
1381 independent of those specified for the primary template). */
1389 && merge_attr
1391 {
1395 else
1398 }
1400 /* Check for redeclaration and other discrepancies. */
1403 {
1406 {
1407 /* Avoid warnings redeclaring built-ins which have not been
1408 explicitly declared. */
1410 {
1414 OPT_Wbuiltin_declaration_mismatch,
1416 newdecl);
1418 }
1420 /* If you declare a built-in or predefined function name as static,
1421 the old definition is overridden, but optionally warn this was a
1422 bad choice of name. */
1424 {
1426 OPT_Wshadow,
1430 /* Discard the old built-in function. */
1432 }
1433 /* If the built-in is not ansi, then programs can override
1434 it even globally without an error. */
1439 else
1441 "declaration of %q#D conflicts with built-in "
1444 }
1446 {
1453 }
1455 {
1456 /* Avoid warnings redeclaring built-ins which have not been
1457 explicitly declared. */
1459 {
1462 /* A new declaration doesn't match a built-in one unless it
1463 is also extern "C". */
1473 {
1476 /* FILE, tm types are not known at the time
1477 we create the builtins. */
1483 {
1490 {
1498 newdecl_is_friend);
1500 }
1502 }
1506 next_arg:;
1507 }
1510 OPT_Wbuiltin_declaration_mismatch,
1511 "declaration of %q#D conflicts with built-in "
1513 }
1518 {
1519 /* Don't really override olddecl for __* prefixed builtins
1520 except for __[^b]*_chk, the compiler might be using those
1521 explicitly. */
1523 {
1535 {
1537 {
1539 "definition of %q#D ambiguates built-in "
1542 }
1543 auto_diagnostic_group d;
1545 "new declaration %q#D ambiguates built-in"
1551 }
1552 }
1554 /* A near match; override the builtin. */
1558 OPT_Wbuiltin_declaration_mismatch,
1559 "new declaration %q#D ambiguates built-in "
1561 else
1566 }
1567 else
1568 /* Discard the old built-in function. */
1571 /* Replace the old RTL to avoid problems with inlining. */
1573 }
1574 /* Even if the types match, prefer the new declarations type for
1575 built-ins which have not been explicitly declared, for
1576 exception lists, etc... */
1578 {
1585 }
1587 /* If a function is explicitly declared "throw ()", propagate that to
1588 the corresponding builtin. */
1593 {
1598 }
1600 /* Whether or not the builtin can throw exceptions has no
1601 bearing on this declarator. */
1605 {
1606 /* If a builtin function is redeclared as `static', merge
1607 the declarations, but make the original one static. */
1611 /* Make the old declaration consistent with the new one so
1612 that all remnants of the builtin-ness of this function
1613 will be banished. */
1616 }
1617 }
1619 {
1620 /* C++ Standard, 3.3, clause 4:
1621 "[Note: a namespace name or a class template name must be unique
1622 in its declarative region (7.3.2, clause 14). ]" */
1629 {
1634 {
1635 /* We do nothing special here, because C++ does such nasty
1636 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1637 get shadowed, and know that if we need to find a TYPE_DECL
1638 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1639 slot of the identifier. */
1641 }
1648 }
1657 }
1659 {
1661 /* These are certainly not duplicate declarations; they're
1662 from different scopes. */
1666 {
1667 /* The name of a class template may not be declared to refer to
1668 any other template, class, function, object, namespace, value,
1669 or type in the same scope. */
1672 {
1678 }
1685 /* Template functions can be disambiguated by
1686 return type. */
1689 // Template functions can also be disambiguated by
1690 // constraints.
1692 {
1694 newdecl);
1697 }
1701 }
1703 {
1705 {
1708 newdecl);
1712 }
1713 /* For function versions, params and types match, but they
1714 are not ambiguous. */
1717 // The functions have the same parameter types.
1720 // And the same constraints.
1722 {
1728 }
1729 else
1731 }
1732 else
1733 {
1738 }
1739 }
1749 /* It's OK to have a template specialization and a non-template
1750 with the same type, or to have specializations of two
1751 different templates with the same type. Note that if one is a
1752 specialization, and the other is an instantiation of the same
1753 template, that we do not exit at this point. That situation
1754 can occur if we instantiate a template class, and then
1755 specialize one of its methods. This situation is valid, but
1756 the declarations must be merged in the usual way. */
1763 /* One of the declarations is a template instantiation, and the
1764 other is not a template at all. That's OK. */
1767 {
1768 /* In [namespace.alias] we have:
1770 In a declarative region, a namespace-alias-definition can be
1771 used to redefine a namespace-alias declared in that declarative
1772 region to refer only to the namespace to which it already
1773 refers.
1775 Therefore, if we encounter a second alias directive for the same
1776 alias, we can just ignore the second directive. */
1782 /* Leave it to update_binding to merge or report error. */
1784 }
1785 else
1786 {
1789 {
1790 auto_diagnostic_group d;
1798 }
1803 {
1804 /* Prototype decl follows defn w/o prototype. */
1805 auto_diagnostic_group d;
1810 }
1813 {
1814 /* [dcl.link]
1815 If two declarations of the same function or object
1816 specify different linkage-specifications ..., the program
1817 is ill-formed.... Except for functions with C++ linkage,
1818 a function declaration without a linkage specification
1819 shall not precede the first linkage specification for
1820 that function. A function can be declared without a
1821 linkage specification after an explicit linkage
1822 specification has been seen; the linkage explicitly
1823 specified in the earlier declaration is not affected by
1824 such a function declaration.
1826 DR 563 raises the question why the restrictions on
1827 functions should not also apply to objects. Older
1828 versions of G++ silently ignore the linkage-specification
1829 for this example:
1831 namespace N {
1832 extern int i;
1833 extern "C" int i;
1834 }
1836 which is clearly wrong. Therefore, we now treat objects
1837 like functions. */
1839 {
1840 /* There is no explicit linkage-specification, so we use
1841 the linkage from the previous declaration. */
1844 }
1845 else
1846 {
1847 auto_diagnostic_group d;
1854 }
1855 }
1858 ;
1860 {
1861 /* Note: free functions, as TEMPLATE_DECLs, are handled below. */
1864 as FUNCTION_DECLs. */
1866 /* C++11 8.3.6/6.
1867 Default arguments for a member function of a class
1868 template shall be specified on the initial declaration
1869 of the member function within the class template. */
1872 else
1873 {
1881 {
1884 {
1885 auto_diagnostic_group d;
1887 "default argument given for parameter "
1891 olddecl);
1892 }
1893 else
1894 {
1895 auto_diagnostic_group d;
1897 "default argument given for parameter %d "
1901 olddecl);
1902 }
1903 }
1905 /* C++17 11.3.6/4: "If a friend declaration specifies a default
1906 argument expression, that declaration... shall be the only
1907 declaration of the function or function template in the
1908 translation unit." */
1909 check_no_redeclaration_friend_default_args
1911 }
1912 }
1913 }
1915 /* Do not merge an implicit typedef with an explicit one. In:
1917 class A;
1918 ...
1919 typedef class A A __attribute__ ((foo));
1921 the attribute should apply only to the typedef. */
1927 /* If new decl is `static' and an `extern' was seen previously,
1928 warn about it. */
1934 /* We have committed to returning 1 at this point. */
1936 {
1937 /* Now that functions must hold information normally held
1938 by field decls, there is extra work to do so that
1939 declaration information does not get destroyed during
1940 definition. */
1958 /* Optionally warn about more than one declaration for the same
1959 name, but don't warn about a function declaration followed by a
1960 definition. */
1963 /* Don't warn about extern decl followed by definition. */
1965 /* Don't warn about friends, let add_friend take care of it. */
1967 /* Don't warn about declaration followed by specialization. */
1970 {
1971 auto_diagnostic_group d;
1973 OPT_Wredundant_decls,
1975 newdecl))
1978 }
1982 {
1984 {
1985 auto_diagnostic_group d;
1989 }
1991 }
1992 }
1994 /* Deal with C++: must preserve virtual function table size. */
1996 {
2006 }
2008 /* Copy all the DECL_... slots specified in the new decl except for
2009 any that we copy here from the old type. */
2013 else
2017 {
2024 {
2027 }
2028 }
2031 {
2043 {
2046 {
2047 /* Per C++11 8.3.6/4, default arguments cannot be added in
2048 later declarations of a function template. */
2050 /* C++17 11.3.6/4: "If a friend declaration specifies a default
2051 argument expression, that declaration... shall be the only
2052 declaration of the function or function template in the
2053 translation unit." */
2054 check_no_redeclaration_friend_default_args
2056 }
2062 {
2065 else
2077 }
2078 else
2079 {
2087 }
2088 }
2090 /* If the new declaration is a definition, update the file and
2091 line information on the declaration, and also make
2092 the old declaration the same definition. */
2094 {
2100 {
2101 tree parm;
2107 }
2108 }
2111 }
2114 {
2118 /* Automatically handles default parameters. */
2120 tree newtype;
2122 /* For typedefs use the old type, as the new type's DECL_NAME points
2123 at newdecl, which will be ggc_freed. */
2125 {
2126 /* But NEWTYPE might have an attribute, honor that. */
2131 {
2135 }
2137 /* And remove the new type from the variants list. */
2139 {
2144 {
2147 }
2148 }
2149 }
2152 else
2156 {
2158 /* For already initialized vars, TREE_READONLY could have been
2159 cleared in cp_finish_decl, because the var needs runtime
2160 initialization or destruction. Make sure not to set
2161 TREE_READONLY on it again. */
2177 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
2180 {
2181 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
2184 }
2185 }
2187 /* An explicit specialization of a function template or of a member
2188 function of a class template can be declared transaction_safe
2189 independently of whether the corresponding template entity is declared
2190 transaction_safe. */
2203 /* Lay the type out, unless already done. */
2217 /* Merge deprecatedness. */
2221 /* Preserve function specific target and optimization options */
2223 {
2233 }
2234 else
2235 {
2236 /* Merge the const type qualifier. */
2239 /* Merge the volatile type qualifier. */
2242 }
2244 /* Merge the initialization information. */
2247 {
2251 {
2254 }
2255 }
2258 {
2268 else
2269 {
2270 /* Merge the noreturn bit. */
2276 }
2277 /* Keep the old RTL. */
2279 }
2282 {
2283 /* Keep the old RTL. We cannot keep the old RTL if the old
2284 declaration was for an incomplete object and the new
2285 declaration is not since many attributes of the RTL will
2286 change. */
2288 }
2289 }
2290 /* If cannot merge, then use the new type and qualifiers,
2291 and don't preserve the old rtl. */
2292 else
2293 {
2294 /* Clean out any memory we had of the old declaration. */
2304 }
2306 /* Merge the storage class information. */
2319 {
2328 {
2335 }
2338 {
2342 }
2347 /* If the OLDDECL is an instantiation and/or specialization,
2348 then the NEWDECL must be too. But, it may not yet be marked
2349 as such if the caller has created NEWDECL, but has not yet
2350 figured out that it is a redeclaration. */
2354 /* Don't really know how much of the language-specific
2355 values we should copy from old to new. */
2362 {
2366 {
2370 /* Remember the presence of explicit specialization args. */
2373 }
2375 }
2376 /* Only functions have these fields. */
2378 {
2383 /* DECL_THUNKS is only valid for virtual functions,
2384 otherwise it is a DECL_FRIEND_CONTEXT. */
2387 }
2388 /* Only variables have this field. */
2392 }
2395 {
2396 tree parm;
2398 /* Merge parameter attributes. */
2407 }
2411 {
2412 /* If newdecl is not a specialization, then it is not a
2413 template-related function at all. And that means that we
2414 should have exited above, returning 0. */
2418 /* From [temp.expl.spec]:
2420 If a template, a member template or the member of a class
2421 template is explicitly specialized then that
2422 specialization shall be declared before the first use of
2423 that specialization that would cause an implicit
2424 instantiation to take place, in every translation unit in
2425 which such a use occurs. */
2427 olddecl);
2433 /* Don't propagate visibility from the template to the
2434 specialization here. We'll do that in determine_visibility if
2435 appropriate. */
2438 /* [temp.expl.spec/14] We don't inline explicit specialization
2439 just because the primary template says so. */
2449 }
2451 {
2452 /* Never inline re-defined extern inline functions.
2453 FIXME: this could be better handled by keeping both
2454 function as separate declarations. */
2456 }
2457 else
2458 {
2460 {
2464 }
2466 ;
2480 }
2482 /* Preserve abstractness on cloned [cd]tors. */
2485 /* Update newdecl's parms to point at olddecl. */
2491 {
2495 }
2497 {
2498 /* These need to be copied so that the names are available.
2499 Note that if the types do match, we'll preserve inline
2500 info and other bits, but if not, we won't. */
2503 }
2504 /* If redeclaring a builtin function, it stays built in
2505 if newdecl is a gnu_inline definition, or if newdecl is just
2506 a declaration. */
2509 {
2512 /* If we're keeping the built-in definition, keep the rtl,
2513 regardless of declaration matches. */
2516 {
2519 {
2520 /* If a compatible prototype of these builtin functions
2521 is seen, assume the runtime implements it with the
2522 expected semantics. */
2531 }
2532 }
2535 }
2537 /* If defining a function declared with other language
2538 linkage, use the previously declared language linkage. */
2541 {
2543 /* Don't clear out the arguments if we're just redeclaring a
2544 function. */
2547 }
2548 }
2552 /* Now preserve various other info from the definition. */
2558 /* Warn about conflicting visibility specifications. */
2562 {
2563 auto_diagnostic_group d;
2565 "%qD: visibility attribute ignored because it "
2569 }
2570 /* Choose the declaration which specified visibility. */
2572 {
2575 }
2576 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2577 so keep this behavior. */
2579 {
2582 }
2583 /* Likewise for DECL_ALIGN, DECL_USER_ALIGN and DECL_PACKED. */
2585 {
2588 }
2597 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2598 with that from NEWDECL below. */
2600 {
2604 }
2606 /* Merge the USED information. */
2612 {
2617 }
2623 /* Merge the DECL_FUNCTION_VERSIONED information. newdecl will be copied
2624 to olddecl and deleted. */
2627 {
2628 /* Set the flag for newdecl so that it gets copied to olddecl. */
2630 /* newdecl will be purged after copying to olddecl and is no longer
2631 a version. */
2633 }
2636 {
2650 /* Preserve symtab node mapping. */
2654 /* If newdecl is a template instantiation, it is possible that
2655 the following sequence of events has occurred:
2657 o A friend function was declared in a class template. The
2658 class template was instantiated.
2660 o The instantiation of the friend declaration was
2661 recorded on the instantiation list, and is newdecl.
2663 o Later, however, instantiate_class_template called pushdecl
2664 on the newdecl to perform name injection. But, pushdecl in
2665 turn called duplicate_decls when it discovered that another
2666 declaration of a global function with the same name already
2667 existed.
2669 o Here, in duplicate_decls, we decided to clobber newdecl.
2671 If we're going to do that, we'd better make sure that
2672 olddecl, and not newdecl, is on the list of
2673 instantiations so that if we try to do the instantiation
2674 again we won't get the clobbered declaration. */
2676 new_template_info,
2677 olddecl);
2678 }
2679 else
2680 {
2687 {
2695 {
2708 }
2716 }
2717 }
2720 {
2724 {
2725 /* Merge the section attribute.
2726 We want to issue an error if the sections conflict but that must be
2727 done later in decl_attributes since we are called before attributes
2728 are assigned. */
2733 {
2737 else
2741 }
2742 }
2746 {
2750 }
2751 }
2757 {
2760 }
2762 /* NEWDECL contains the merged attribute lists.
2763 Update OLDDECL to be the same. */
2766 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2767 so that encode_section_info has a chance to look at the new decl
2768 flags and attributes. */
2775 /* The NEWDECL will no longer be needed. Because every out-of-class
2776 declaration of a member results in a call to duplicate_decls,
2777 freeing these nodes represents in a significant savings.
2779 Before releasing the node, be sore to remove function from symbol
2780 table that might have been inserted there to record comdat group.
2781 Be sure to however do not free DECL_STRUCT_FUNCTION because this
2782 structure is shared in between newdecl and oldecl. */
2786 {
2790 }
2792 /* Remove the associated constraints for newdecl, if any, before
2793 reclaiming memory. */
2800 }
2801 \f
2802 /* Return zero if the declaration NEWDECL is valid
2803 when the declaration OLDDECL (assumed to be for the same name)
2804 has already been seen.
2805 Otherwise return an error message format string with a %s
2806 where the identifier should go. */
2810 {
2812 {
2813 /* Because C++ can put things into name space for free,
2814 constructs like "typedef struct foo { ... } foo"
2815 would look like an erroneous redeclaration. */
2818 else
2820 }
2822 {
2823 /* If this is a pure function, its olddecl will actually be
2824 the original initialization to `0' (which we force to call
2825 abort()). Don't complain about redefinition in this case. */
2830 /* If both functions come from different namespaces, this is not
2831 a redeclaration - this is a conflict with a used function. */
2837 /* We'll complain about linkage mismatches in
2838 warn_extern_redeclared_static. */
2840 /* Defining the same name twice is no good. */
2843 {
2849 }
2852 {
2857 {
2861 else
2864 }
2865 }
2867 check_abi_tag_redeclaration
2872 }
2874 {
2878 {
2883 }
2901 {
2906 {
2910 else
2913 }
2914 }
2916 /* Core issue #226 (C++0x):
2918 If a friend function template declaration specifies a
2919 default template-argument, that declaration shall be a
2920 definition and shall be the only declaration of the
2921 function template in the translation unit. */
2932 }
2938 {
2939 /* Only variables can be thread-local, and all declarations must
2940 agree on this property. */
2944 else
2947 }
2949 {
2950 /* The objects have been declared at namespace scope. If either
2951 is a member of an anonymous union, then this is an invalid
2952 redeclaration. For example:
2954 int i;
2955 union { int i; };
2957 is invalid. */
2961 /* If at least one declaration is a reference, there is no
2962 conflict. For example:
2964 int i = 3;
2965 extern int i;
2967 is valid. */
2971 /* Static data member declared outside a class definition
2972 if the variable is defined within the class with constexpr
2973 specifier is declaration rather than definition (and
2974 deprecated). */
2980 {
2982 /* For now, only warn with explicit -Wdeprecated. */
2984 {
2985 auto_diagnostic_group d;
2987 "redundant redeclaration of %<constexpr%> "
2991 }
2993 }
2995 /* Reject two definitions. */
2997 }
2998 else
2999 {
3000 /* Objects declared with block scope: */
3001 /* Reject two definitions, and reject a definition
3002 together with an external reference. */
3006 }
3007 }
3008 \f
3010 /* Hash and equality functions for the named_label table. */
3012 hashval_t
3014 {
3016 }
3018 bool
3020 {
3022 }
3024 /* Look for a label named ID in the current function. If one cannot
3025 be found, create one. Return the named_label_entry, or NULL on
3026 failure. */
3030 {
3031 /* You can't use labels at global scope. */
3033 {
3036 }
3042 named_label_entry **slot
3047 {
3052 {
3056 }
3057 }
3059 /* We are making a new decl, create or reuse the named_label_entry */
3063 else
3064 {
3069 }
3071 /* Now create the LABEL_DECL. */
3077 {
3081 }
3086 }
3088 /* Wrapper for lookup_label_1. */
3090 tree
3092 {
3097 }
3099 tree
3101 {
3106 }
3108 /* Returns nonzero if it is ill-formed to jump past the declaration of
3109 DECL. Returns 2 if it's also a real problem. */
3111 static int
3113 {
3114 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
3115 with automatic storage duration is not in scope to a point where it is
3116 in scope is ill-formed unless the variable has scalar type, class type
3117 with a trivial default constructor and a trivial destructor, a
3118 cv-qualified version of one of these types, or an array of one of the
3119 preceding types and is declared without an initializer (8.5). */
3134 }
3136 /* A subroutine of check_previous_goto_1 and check_goto to identify a branch
3137 to the user. */
3139 static bool
3141 diagnostic_t diag_kind)
3142 {
3143 bool complained
3150 }
3152 /* Check that a single previously seen jump to a newly defined label
3153 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
3154 the jump context; NAMES are the names in scope in LEVEL at the jump
3155 context; LOCUS is the source position of the jump or 0. Returns
3156 true if all is well. */
3158 static bool
3161 {
3168 {
3174 }
3177 {
3183 {
3189 {
3194 }
3196 {
3200 else
3202 " enters scope of %q#D, which has "
3204 }
3205 }
3213 {
3240 {
3244 }
3249 }
3252 {
3258 }
3259 }
3262 }
3264 static void
3266 {
3270 }
3272 static bool
3274 {
3276 }
3278 /* Check that a new jump to a label DECL is OK. Called by
3279 finish_goto_stmt. */
3281 void
3283 {
3284 /* We can't know where a computed goto is jumping.
3285 So we assume that it's OK. */
3289 /* We didn't record any information about this label when we created it,
3290 and there's not much point since it's trivial to analyze as a return. */
3295 named_label_entry **slot
3299 /* If the label hasn't been defined yet, defer checking. */
3301 {
3302 /* Don't bother creating another use if the last goto had the
3303 same data, and will therefore create the same set of errors. */
3308 named_label_use_entry *new_use
3318 }
3322 tree bad;
3328 {
3336 }
3339 {
3343 {
3344 /* Can't skip init of __exception_info. */
3346 {
3350 }
3354 }
3356 {
3360 else
3362 " enters scope of %q#D which has "
3364 }
3365 }
3368 {
3377 }
3380 {
3383 }
3386 {
3390 {
3392 {
3397 }
3401 }
3402 }
3403 }
3405 /* Check that a return is ok wrt OpenMP structured blocks.
3406 Called by finish_return_stmt. Returns true if all is well. */
3408 bool
3410 {
3413 {
3416 }
3420 }
3422 /* Define a label, specifying the location in the source file.
3423 Return the LABEL_DECL node for the label. */
3425 static tree
3427 {
3428 /* After labels, make any new cleanups in the function go into their
3429 own new (temporary) binding contour. */
3439 {
3442 }
3443 else
3444 {
3445 /* Mark label as having been defined. */
3447 /* Say where in the source. */
3456 }
3459 }
3461 /* Wrapper for define_label_1. */
3463 tree
3465 {
3470 }
3473 struct cp_switch
3474 {
3477 /* The SWITCH_STMT being built. */
3478 tree switch_stmt;
3479 /* A splay-tree mapping the low element of a case range to the high
3480 element, or NULL_TREE if there is no high element. Used to
3481 determine whether or not a new case label duplicates an old case
3482 label. We need a tree, rather than simply a hash table, because
3483 of the GNU case range extension. */
3484 splay_tree cases;
3485 /* Remember whether there was a case value that is outside the
3486 range of the original type of the controlling expression. */
3488 /* Remember whether a default: case label has been seen. */
3490 /* Remember whether a BREAK_STMT has been seen in this SWITCH_STMT. */
3492 /* Set if inside of {FOR,DO,WHILE}_BODY nested inside of a switch,
3493 where BREAK_STMT doesn't belong to the SWITCH_STMT. */
3495 };
3497 /* A stack of the currently active switch statements. The innermost
3498 switch statement is on the top of the stack. There is no need to
3499 mark the stack for garbage collection because it is only active
3500 during the processing of the body of a function, and we never
3501 collect at that point. */
3505 /* Called right after a switch-statement condition is parsed.
3506 SWITCH_STMT is the switch statement being parsed. */
3508 void
3510 {
3521 }
3523 void
3525 {
3527 location_t switch_location;
3529 /* Emit warnings as needed. */
3531 const bool bool_cond_p
3540 /* For the benefit of block_may_fallthru remember if the switch body
3541 case labels cover all possible values and if there are break; stmts. */
3543 || (!processing_template_decl
3553 }
3555 /* Note that a BREAK_STMT is about to be added. If it is inside of
3556 a SWITCH_STMT and not inside of a loop body inside of it, note
3557 in switch_stack we've seen a BREAK_STMT. */
3559 void
3561 {
3564 }
3566 /* Note the start of processing of an iteration statement's body.
3567 The note_break_stmt function will do nothing while processing it.
3568 Return a flag that should be passed to note_iteration_stmt_body_end. */
3570 bool
3572 {
3578 }
3580 /* Note the end of processing of an iteration statement's body. */
3582 void
3584 {
3587 }
3589 /* Convert a case constant VALUE in a switch to the type TYPE of the switch
3590 condition. Note that if TYPE and VALUE are already integral we don't
3591 really do the conversion because the language-independent
3592 warning/optimization code will work better that way. */
3594 static tree
3596 {
3605 {
3608 value = (perform_implicit_conversion_flags
3611 }
3613 }
3615 /* Note that we've seen a definition of a case label, and complain if this
3616 is a bad place for one. */
3618 tree
3620 {
3623 tree type;
3629 {
3630 tree label;
3632 /* For templates, just add the case label; we'll do semantic
3633 analysis at instantiation-time. */
3636 }
3638 /* Find the condition on which this switch statement depends. */
3657 /* After labels, make any new cleanups in the function go into their
3658 own new (temporary) binding contour. */
3665 }
3666 \f
3668 tree scope;
3669 tree name;
3670 tree template_id;
3673 };
3676 {
3679 /* Hash a TYPENAME_TYPE. */
3681 static hashval_t
3683 {
3684 hashval_t hash;
3690 }
3692 /* Compare two TYPENAME_TYPEs. */
3694 static bool
3696 {
3702 }
3703 };
3705 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3706 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3708 Returns the new TYPENAME_TYPE. */
3712 tree
3715 {
3716 tree t;
3717 tree d;
3718 typename_info ti;
3720 hashval_t hash;
3735 /* See if we already have this type. */
3739 else
3740 {
3741 /* Build the TYPENAME_TYPE. */
3748 /* Build the corresponding TYPE_DECL. */
3755 /* Store it in the hash table. */
3758 /* TYPENAME_TYPEs must always be compared structurally, because
3759 they may or may not resolve down to another type depending on
3760 the currently open classes. */
3762 }
3765 }
3767 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3768 provided to name the type. Returns an appropriate type, unless an
3769 error occurs, in which case error_mark_node is returned. If we
3770 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3771 return that, rather than the _TYPE it corresponds to, in other
3772 cases we look through the type decl. If TF_ERROR is set, complain
3773 about errors, otherwise be quiet. */
3775 tree
3777 tsubst_flags_t complain)
3778 {
3779 tree fullname;
3780 tree t;
3789 {
3794 else
3795 /* Create a TEMPLATE_ID_EXPR for the type. */
3799 }
3806 {
3811 {
3815 }
3816 }
3818 {
3822 }
3827 {
3831 }
3833 /* When the CONTEXT is a dependent type, NAME could refer to a
3834 dependent base class of CONTEXT. But look inside it anyway
3835 if CONTEXT is a currently open scope, in case it refers to a
3836 member of the current instantiation or a non-dependent base;
3837 lookup will stop when we hit a dependent base. */
3839 /* We should only set WANT_TYPE when we're a nested typename type.
3840 Then we can give better diagnostics if we find a non-type. */
3842 else
3851 {
3853 {
3856 else
3859 }
3861 }
3863 /* Pull out the template from an injected-class-name (or multiple). */
3868 {
3870 {
3873 }
3875 }
3878 {
3883 }
3885 {
3890 }
3895 /* If we are currently parsing a template and if T is a typedef accessed
3896 through CONTEXT then we need to remember and check access of T at
3897 template instantiation time. */
3912 }
3914 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3915 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3916 in which case error_mark_node is returned.
3918 If PARM_LIST is non-NULL, also make sure that the template parameter
3919 list of TEMPLATE_DECL matches.
3921 If COMPLAIN zero, don't complain about any errors that occur. */
3923 tree
3925 tsubst_flags_t complain)
3926 {
3927 tree t;
3928 tree d;
3938 {
3948 {
3952 }
3956 {
3958 {
3962 }
3964 }
3967 complain))
3971 }
3973 /* Build the UNBOUND_CLASS_TEMPLATE. */
3979 /* Build the corresponding TEMPLATE_DECL. */
3988 }
3990 \f
3992 /* Push the declarations of builtin types into the global namespace.
3993 RID_INDEX is the index of the builtin type in the array
3994 RID_POINTERS. NAME is the name used when looking up the builtin
3995 type. TYPE is the _TYPE node for the builtin type.
3997 The calls to set_global_binding below should be
3998 eliminated. Built-in types should not be looked up name; their
3999 names are keywords that the parser can recognize. However, there
4000 is code in c-common.c that uses identifier_global_value to look up
4001 built-in types by name. */
4003 void
4006 tree type)
4007 {
4011 {
4017 }
4022 {
4028 }
4031 {
4035 }
4036 }
4038 /* Push a type into the namespace so that the back ends ignore it. */
4040 static void
4042 {
4045 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
4052 }
4054 /* Create all the predefined identifiers. */
4056 static void
4058 {
4059 struct predefined_identifier
4060 {
4064 };
4066 /* A table of identifiers to create at startup. */
4070 /* Some of these names have a trailing space so that it is
4071 impossible for them to conflict with names written by users. */
4088 /* The demangler expects anonymous namespaces to be called
4089 something starting with '_GLOBAL__N_'. It no longer needs
4090 to be unique to the TU. */
4114 };
4118 {
4120 /* Some of these identifiers already have a special kind. */
4123 }
4124 }
4126 /* Create the predefined scalar types of C,
4127 and some nodes representing standard constants (0, 1, (void *)0).
4128 Initialize the global binding level.
4129 Make definitions for built-in primitive functions. */
4131 void
4133 {
4134 tree void_ftype;
4135 tree void_ftype_ptr;
4137 /* Create all the identifiers we need. */
4140 /* Create the global variables. */
4145 /* Enter the global namespace. */
4148 void_type_node);
4152 /* Remember whether we want the empty class passing ABI change warning
4153 in this TU. */
4156 debug_hooks->register_main_translation_unit
4164 /* Initially, C. */
4167 /* Create the `std' namespace. */
4177 tree decl
4185 /* Guess at the initial static decls size. */
4188 /* ... and keyed classes. */
4200 NULL_TREE);
4202 #if 0
4204 #endif
4213 void_ftype_ptr
4216 /* Create the conversion operator marker. This operator's DECL_NAME
4217 is in the identifier table, so we can use identifier equality to
4218 find it. */
4220 void_ftype);
4222 /* C++ extensions */
4227 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
4230 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
4231 result. */
4238 {
4239 /* Make sure we get a unique function type, so we can give
4240 its pointer type a name. (This wins for gdb.) */
4247 }
4250 vtbl_type_node
4269 /* Now, C++. */
4274 {
4277 }
4283 {
4286 tree ptr_ftype_sizetype;
4287 tree new_eh_spec;
4289 ptr_ftype_sizetype
4292 {
4293 tree bad_alloc_id;
4294 tree bad_alloc_type_node;
4295 tree bad_alloc_decl;
4301 bad_alloc_decl
4306 new_eh_spec
4308 }
4309 else
4312 /* Ensure attribs.c is initialized. */
4315 /* Ensure constraint.cc is initialized. */
4319 NULL_TREE);
4322 extvisattr);
4336 {
4337 /* Also push the sized deallocation variants:
4338 void operator delete(void*, std::size_t) throw();
4339 void operator delete[](void*, std::size_t) throw(); */
4340 tree void_ftype_ptr_size
4344 extvisattr);
4348 }
4351 {
4358 /* operator new (size_t, align_val_t); */
4370 /* operator delete (void *, align_val_t); */
4379 {
4380 /* operator delete (void *, size_t, align_val_t); */
4383 NULL_TREE);
4388 }
4389 }
4401 }
4403 abort_fndecl
4407 /* Perform other language dependent initializations. */
4421 /* Show we use EH for cleanups. */
4424 }
4426 /* Generate an initializer for a function naming variable from
4427 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
4428 filled in with the type of the init. */
4430 tree
4432 {
4434 tree type;
4439 {
4443 }
4452 else
4456 }
4458 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
4459 the decl, LOC is the location to give the decl, NAME is the
4460 initialization string and TYPE_DEP indicates whether NAME depended
4461 on the type of the function. We make use of that to detect
4462 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
4463 at the point of first use, so we mustn't push the decl now. */
4465 static tree
4467 {
4470 tree type;
4484 {
4488 LOOKUP_ONLYCONVERTING);
4489 }
4490 else
4491 {
4494 }
4497 }
4499 static tree
4501 {
4509 /* Runtime library routines are, by definition, available in an
4510 external shared object. */
4516 /* A function in the user's namespace should have an explicit
4517 declaration before it is used. Mark the built-in function as
4518 anticipated but not actually declared. */
4522 {
4525 /* Treat __*_chk fortification functions as anticipated as well,
4526 unless they are __builtin_*. */
4531 }
4535 else
4539 }
4541 tree
4543 {
4546 /* All builtins that don't begin with an '_' should additionally
4547 go in the 'std' namespace. */
4549 {
4554 }
4557 }
4559 /* Like cxx_builtin_function, but guarantee the function is added to the global
4560 scope. This is to allow function specific options to add new machine
4561 dependent builtins when the target ISA changes via attribute((target(...)))
4562 which saves space on program startup if the program does not use non-generic
4563 ISAs. */
4565 tree
4567 {
4571 /* All builtins that don't begin with an '_' should additionally
4572 go in the 'std' namespace. */
4574 {
4579 }
4582 }
4584 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
4585 function. Not called directly. */
4587 static tree
4590 {
4598 /* Runtime library routines are, by definition, available in an
4599 external shared object. */
4604 }
4606 /* Returns the _DECL for a library function with C++ linkage. */
4608 static tree
4611 {
4616 }
4618 /* Like build_library_fn, but takes a C string instead of an
4619 IDENTIFIER_NODE. */
4621 tree
4623 {
4625 }
4627 /* Like build_cp_library_fn, but takes a C string instead of an
4628 IDENTIFIER_NODE. */
4630 tree
4632 {
4634 ecf_flags);
4635 }
4637 /* Like build_library_fn, but also pushes the function so that we will
4638 be able to find it via get_global_binding. Also, the function
4639 may throw exceptions listed in RAISES. */
4641 tree
4643 {
4644 tree fn;
4652 }
4654 /* Like build_cp_library_fn, but also pushes the function so that it
4655 will be found by normal lookup. */
4657 static tree
4660 {
4667 }
4669 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
4670 a FUNCTION_TYPE. */
4672 tree
4674 {
4677 }
4679 /* Like push_library_fn, but also note that this function throws
4680 and does not return. Used for __throw_foo and the like. */
4682 tree
4684 {
4687 }
4688 \f
4689 /* When we call finish_struct for an anonymous union, we create
4690 default copy constructors and such. But, an anonymous union
4691 shouldn't have such things; this function undoes the damage to the
4692 anonymous union type T.
4694 (The reason that we create the synthesized methods is that we don't
4695 distinguish `union { int i; }' from `typedef union { int i; } U'.
4696 The first is an anonymous union; the second is just an ordinary
4697 union type.) */
4699 void
4701 {
4702 /* Wipe out memory of synthesized methods. */
4710 /* Splice the implicitly generated functions out of TYPE_FIELDS. */
4714 else
4717 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4718 assignment operators (because they cannot have these methods themselves).
4719 For anonymous unions this is already checked because they are not allowed
4720 in any union, otherwise we have to check it. */
4722 {
4727 {
4730 {
4740 }
4741 }
4742 }
4743 }
4745 /* Warn for an attribute located at LOCATION that appertains to the
4746 class type CLASS_TYPE that has not been properly placed after its
4747 class-key, in it class-specifier. */
4749 void
4751 tree class_type)
4752 {
4755 auto_diagnostic_group d;
4757 "attribute ignored in declaration "
4762 }
4764 /* Make sure that a declaration with no declarator is well-formed, i.e.
4765 just declares a tagged type or anonymous union.
4767 Returns the type declared; or NULL_TREE if none. */
4769 tree
4772 {
4775 /* If a class, struct, or enum type is declared by the DECLSPECS
4776 (i.e, if a class-specifier, enum-specifier, or non-typename
4777 elaborated-type-specifier appears in the DECLSPECS),
4778 DECLARED_TYPE is set to the corresponding type. */
4785 {
4791 }
4804 {
4806 "%<auto%> can only be specified for variables "
4809 }
4810 /* Check for an anonymous union. */
4813 {
4814 /* 7/3 In a simple-declaration, the optional init-declarator-list
4815 can be omitted only when declaring a class (clause 9) or
4816 enumeration (7.2), that is, when the decl-specifier-seq contains
4817 either a class-specifier, an elaborated-type-specifier with
4818 a class-key (9.1), or an enum-specifier. In these cases and
4819 whenever a class-specifier or enum-specifier is present in the
4820 decl-specifier-seq, the identifiers in these specifiers are among
4821 the names being declared by the declaration (as class-name,
4822 enum-names, or enumerators, depending on the syntax). In such
4823 cases, and except for the declaration of an unnamed bit-field (9.6),
4824 the decl-specifier-seq shall introduce one or more names into the
4825 program, or shall redeclare a name introduced by a previous
4826 declaration. [Example:
4827 enum { }; // ill-formed
4828 typedef class { }; // ill-formed
4829 --end example] */
4831 {
4834 }
4841 }
4843 else
4844 {
4852 && (!current_class_type
4861 "a storage class can only be specified for objects "
4865 "%<const%> can only be specified for objects and "
4869 "%<volatile%> can only be specified for objects and "
4873 "%<__restrict%> can only be specified for objects and "
4877 "%<__thread%> can only be specified for objects "
4885 }
4888 {
4889 location_t loc;
4892 /* For a non-template class, use the name location. */
4894 else
4895 /* For a template class (an explicit instantiation), use the
4896 current location. */
4900 /* [dcl.attr.grammar]/4:
4902 No attribute-specifier-seq shall appertain to an explicit
4903 instantiation. */
4904 {
4907 declared_type))
4909 "no attribute can be applied to "
4911 }
4912 else
4914 }
4917 }
4919 /* Called when a declaration is seen that contains no names to declare.
4920 If its type is a reference to a structure, union or enum inherited
4921 from a containing scope, shadow that tag name for the current scope
4922 with a forward reference.
4923 If its type defines a new named structure or union
4924 or defines an enum, it is valid but we need not do anything here.
4925 Otherwise, it is an error.
4927 C++: may have to grok the declspecs to learn about static,
4928 complain for anonymous unions.
4930 Returns the TYPE declared -- or NULL_TREE if none. */
4932 tree
4934 {
4944 /* This is where the variables in an anonymous union are
4945 declared. An anonymous union declaration looks like:
4946 union { ... } ;
4947 because there is no declarator after the union, the parser
4948 sends that declaration here. */
4950 {
4954 {
4958 }
4959 }
4962 }
4963 \f
4964 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4966 tree
4970 {
4971 tree attrs;
4972 tree type;
4973 enum decl_context context
4979 {
4984 /* A template type parameter or other dependent type. */
4987 else
4989 }
4991 }
4993 /* Process a DECLARATOR for a function-scope variable declaration,
4994 namespace-scope variable declaration, or function declaration.
4995 (Function definitions go through start_function; class member
4996 declarations appearing in the body of the class go through
4997 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4998 If an error occurs, the error_mark_node is returned instead.
5000 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
5001 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
5002 for an explicitly defaulted function, or SD_DELETED for an explicitly
5003 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
5004 implicitly initialized via a default constructor. ATTRIBUTES and
5005 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
5007 The scope represented by the context of the returned DECL is pushed
5008 (if it is not the global namespace) and is assigned to
5009 *PUSHED_SCOPE_P. The caller is then responsible for calling
5010 pop_scope on *PUSHED_SCOPE_P if it is set. */
5012 tree
5016 tree attributes,
5017 tree prefix_attributes,
5019 {
5020 tree decl;
5021 tree context;
5028 /* An object declared as __attribute__((deprecated)) suppresses
5029 warnings of uses of other deprecated items. */
5048 /* Is it valid for this decl to have an initializer at all?
5049 If not, set INITIALIZED to zero, which will indirectly
5050 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
5053 {
5056 }
5059 {
5063 decl);
5067 }
5073 /* If this is a typedef that names the class for linkage purposes
5074 (7.1.3p8), apply any attributes directly to the type. */
5079 else
5082 /* Set attributes here so if duplicate decl, will have proper attributes. */
5085 /* Dllimported symbols cannot be defined. Static data members (which
5086 can be initialized in-class and dllimported) go through grokfield,
5087 not here, so we don't need to exclude those decls when checking for
5088 a definition. */
5090 {
5093 }
5095 /* If #pragma weak was used, mark the decl weak now. */
5107 {
5111 {
5121 {
5127 }
5128 else
5129 {
5134 {
5141 }
5142 /* Static data member are tricky; an in-class initialization
5143 still doesn't provide a definition, so the in-class
5144 declaration will have DECL_EXTERNAL set, but will have an
5145 initialization. Thus, duplicate_decls won't warn
5146 about this situation, and so we check here. */
5155 }
5156 }
5157 else
5158 {
5160 this_tmpl
5161 ? current_template_parms
5167 }
5169 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
5171 /* Do not mark DECL as an explicit specialization if it was not
5172 already marked as an instantiation; a declaration should
5173 never be marked as a specialization unless we know what
5174 template is being specialized. */
5176 {
5181 else
5184 /* [temp.expl.spec] An explicit specialization of a static data
5185 member of a template is a definition if the declaration
5186 includes an initializer; otherwise, it is a declaration.
5188 We check for processing_specialization so this only applies
5189 to the new specialization syntax. */
5192 }
5195 /* Aliases are definitions. */
5198 decl);
5199 }
5203 /* Enter this declaration into the symbol table. Don't push the plain
5204 VAR_DECL for a variable template. */
5217 {
5218 /* This is a const variable with implicit 'static'. Set
5219 DECL_THIS_STATIC so we can tell it from variables that are
5220 !TREE_PUBLIC because of the anonymous namespace. */
5223 }
5227 {
5231 decl);
5234 else
5238 }
5244 }
5246 /* Process the declaration of a variable DECL. INITIALIZED is true
5247 iff DECL is explicitly initialized. (INITIALIZED is false if the
5248 variable is initialized via an implicitly-called constructor.)
5249 This function must be called for ordinary variables (including, for
5250 example, implicit instantiations of templates), but must not be
5251 called for template declarations. */
5253 void
5255 {
5256 tree type;
5271 /* If an explicit initializer is present, or if this is a definition
5272 of an aggregate, then we need a complete type at this point.
5273 (Scalars are always complete types, so there is nothing to
5274 check.) This code just sets COMPLETE_P; errors (if necessary)
5275 are issued below. */
5277 && !complete_p
5279 {
5281 /* We will not yet have set TREE_READONLY on DECL if the type
5282 was "const", but incomplete, before this point. But, now, we
5283 have a complete type, so we can try again. */
5285 }
5288 /* Is it valid for this decl to have an initializer at all? */
5289 {
5290 /* Don't allow initializations for incomplete types except for
5291 arrays which might be completed by the initialization. */
5297 {
5300 }
5302 {
5305 /* else we already gave an error in start_decl. */
5306 }
5307 }
5309 {
5312 else
5313 {
5315 decl);
5316 /* Change the type so that assemble_variable will give
5317 DECL an rtl we can live with: (mem (const_int 0)). */
5319 }
5320 }
5322 /* Create a new scope to hold this declaration if necessary.
5323 Whether or not a new scope is necessary cannot be determined
5324 until after the type has been completed; if the type is a
5325 specialization of a class template it is not until after
5326 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
5327 will be set correctly. */
5329 }
5331 /* Handle initialization of references. DECL, TYPE, and INIT have the
5332 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
5333 but will be set to a new CLEANUP_STMT if a temporary is created
5334 that must be destroyed subsequently.
5336 Returns an initializer expression to use to initialize DECL, or
5337 NULL if the initialization can be performed statically.
5339 Quotes on semantics can be found in ARM 8.4.3. */
5341 static tree
5343 {
5345 {
5351 }
5355 tf_warning_or_error);
5360 /* Note: default conversion is only called in very special cases. */
5363 /* check_initializer handles this for non-reference variables, but for
5364 references we need to do it here or the initializer will get the
5365 incomplete array type and confuse later calls to
5366 cp_complete_array_type. */
5371 {
5375 }
5377 /* Convert INIT to the reference type TYPE. This may involve the
5378 creation of a temporary, whose lifetime must be the same as that
5379 of the reference. If so, a DECL_EXPR for the temporary will be
5380 added just after the DECL_EXPR for DECL. That's why we don't set
5381 DECL_INITIAL for local references (instead assigning to them
5382 explicitly); we need to allow the temporary to be initialized
5383 first. */
5385 tf_warning_or_error);
5386 }
5388 /* Designated initializers in arrays are not supported in GNU C++.
5389 The parser cannot detect this error since it does not know whether
5390 a given brace-enclosed initializer is for a class type or for an
5391 array. This function checks that CE does not use a designated
5392 initializer. If it does, an error is issued. Returns true if CE
5393 is valid, i.e., does not have a designated initializer. */
5395 bool
5398 {
5399 /* Designated initializers for array elements are not supported. */
5401 {
5402 /* The parser only allows identifiers as designated
5403 initializers. */
5405 {
5409 }
5411 {
5415 }
5423 {
5424 /* A C99 designator is OK if it matches the current index. */
5426 {
5429 }
5430 else
5432 }
5433 else
5438 }
5441 }
5443 /* When parsing `int a[] = {1, 2};' we don't know the size of the
5444 array until we finish parsing the initializer. If that's the
5445 situation we're in, update DECL accordingly. */
5447 static void
5449 {
5455 {
5456 /* do_default is really a C-ism to deal with tentative definitions.
5457 But let's leave it here to ease the eventual merge. */
5462 /* Check that there are no designated initializers in INIT, as
5463 those are not supported in GNU C++, and as the middle-end
5464 will crash if presented with a non-numeric designated
5465 initializer. */
5467 {
5470 HOST_WIDE_INT i;
5472 {
5477 }
5478 }
5482 else
5483 {
5485 do_default);
5487 {
5491 }
5493 {
5495 {
5498 }
5499 /* If a `static' var's size isn't known, make it extern as
5500 well as static, so it does not get allocated. If it's not
5501 `static', then don't mark it extern; finish_incomplete_decl
5502 will give it a default size and it will get allocated. */
5505 }
5507 {
5510 }
5511 }
5516 }
5517 }
5519 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
5520 any appropriate error messages regarding the layout. */
5522 static void
5524 {
5525 tree type;
5531 /* If we haven't already laid out this declaration, do so now.
5532 Note that we must not call complete type for an external object
5533 because it's type might involve templates that we are not
5534 supposed to instantiate yet. (And it's perfectly valid to say
5535 `extern X x' for some incomplete type `X'.) */
5544 {
5545 /* An automatic variable with an incomplete type: that is an error.
5546 Don't talk about array types here, since we took care of that
5547 message in grokdeclarator. */
5551 }
5552 #if 0
5553 /* Keep this code around in case we later want to control debug info
5554 based on whether a type is "used". (jason 1999-11-11) */
5557 /* Let debugger know it should output info for this type. */
5562 #endif
5567 {
5570 else
5571 {
5575 }
5576 }
5577 }
5579 /* If a local static variable is declared in an inline function, or if
5580 we have a weak definition, we must endeavor to create only one
5581 instance of the variable at link-time. */
5583 void
5585 {
5586 /* Don't mess with __FUNCTION__ and similar. */
5590 /* Static data in a function with comdat linkage also has comdat
5591 linkage. */
5596 {
5598 {
5599 /* With weak symbols, we simply make the variable COMDAT;
5600 that will cause copies in multiple translations units to
5601 be merged. */
5603 }
5604 else
5605 {
5608 {
5609 /* Without weak symbols, we can use COMMON to merge
5610 uninitialized variables. */
5613 }
5614 else
5615 {
5616 /* While for initialized variables, we must use internal
5617 linkage -- which means that multiple copies will not
5618 be merged. */
5624 "%q#D are wrong (you%'ll wind up with "
5626 else
5628 "static data %q#D are wrong (you%'ll wind "
5634 }
5635 }
5636 }
5637 }
5639 /* Issue an error message if DECL is an uninitialized const variable.
5640 CONSTEXPR_CONTEXT_P is true when the function is called in a constexpr
5641 context from potential_constant_expression. Returns true if all is well,
5642 false otherwise. */
5644 bool
5646 tsubst_flags_t complain)
5647 {
5650 /* ``Unless explicitly declared extern, a const object does not have
5651 external linkage and must be initialized. ($8.4; $12.1)'' ARM
5652 7.1.6 */
5655 && (constexpr_context_p
5658 {
5664 {
5666 {
5670 }
5671 else
5672 {
5676 "uninitialized variable %qD in %<constexpr%> "
5679 }
5680 }
5684 decl);
5687 {
5688 tree defaulted_ctor;
5695 "constructor is not user-provided because it is "
5698 "and the implicitly-defined constructor does not "
5700 }
5703 }
5706 }
5707 \f
5708 /* Structure holding the current initializer being processed by reshape_init.
5709 CUR is a pointer to the current element being processed, END is a pointer
5710 after the last element present in the initializer. */
5711 struct reshape_iter
5712 {
5715 };
5719 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
5720 returned is the next FIELD_DECL (possibly FIELD itself) that can be
5721 initialized. If there are no more such fields, the return value
5722 will be NULL. */
5724 tree
5726 {
5735 }
5737 /* Return true for [dcl.init.list] direct-list-initialization from
5738 single element of enumeration with a fixed underlying type. */
5740 bool
5742 {
5751 }
5753 /* Subroutine of reshape_init_array and reshape_init_vector, which does
5754 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
5755 INTEGER_CST representing the size of the array minus one (the maximum index),
5756 or NULL_TREE if the array was declared without specifying the size. D is
5757 the iterator within the constructor. */
5759 static tree
5761 tsubst_flags_t complain)
5762 {
5763 tree new_init;
5768 /* The initializer for an array is always a CONSTRUCTOR. */
5772 {
5773 /* Minus 1 is used for zero sized arrays. */
5779 /* sizetype is sign extended, not zero extended. */
5780 else
5782 }
5784 /* Loop until there are no more initializers. */
5788 {
5789 tree elt_init;
5794 complain);
5802 /* This can happen with an invalid initializer (c++/54501). */
5805 }
5808 }
5810 /* Subroutine of reshape_init_r, processes the initializers for arrays.
5811 Parameters are the same of reshape_init_r. */
5813 static tree
5815 {
5824 }
5826 /* Subroutine of reshape_init_r, processes the initializers for vectors.
5827 Parameters are the same of reshape_init_r. */
5829 static tree
5831 {
5837 {
5840 {
5845 }
5848 }
5850 /* For a vector, we initialize it as an array of the appropriate size. */
5855 }
5857 /* Subroutine of reshape_init_r, processes the initializers for classes
5858 or union. Parameters are the same of reshape_init_r. */
5860 static tree
5862 tsubst_flags_t complain)
5863 {
5864 tree field;
5865 tree new_init;
5869 /* The initializer for a class is always a CONSTRUCTOR. */
5874 {
5875 /* [dcl.init.aggr]
5877 An initializer for an aggregate member that is an
5878 empty class shall have the form of an empty
5879 initializer-list {}. */
5881 {
5885 }
5887 }
5889 /* Loop through the initializable fields, gathering initializers. */
5891 {
5892 tree field_init;
5895 /* Handle designated initializers, as an extension. */
5897 {
5902 {
5903 /* We already reshaped this. */
5905 {
5911 }
5912 }
5915 else
5916 {
5921 }
5924 {
5929 }
5930 }
5932 /* If we processed all the member of the class, we are done. */
5942 {
5943 /* This can happen with an invalid initializer for a flexible
5944 array member (c++/54441). */
5948 }
5952 /* [dcl.init.aggr]
5954 When a union is initialized with a brace-enclosed
5955 initializer, the braces shall only contain an
5956 initializer for the first member of the union. */
5961 }
5964 }
5966 /* Subroutine of reshape_init_r. We're in a context where C99 initializer
5967 designators are not valid; either complain or return true to indicate
5968 that reshape_init_r should return error_mark_node. */
5970 static bool
5972 {
5974 {
5978 else
5980 }
5982 }
5984 /* Subroutine of reshape_init, which processes a single initializer (part of
5985 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5986 iterator within the CONSTRUCTOR which points to the initializer to process.
5987 FIRST_INITIALIZER_P is true if this is the first initializer of the
5988 outermost CONSTRUCTOR node. */
5990 static tree
5992 tsubst_flags_t complain)
5993 {
6004 {
6005 /* A complex type can be initialized from one or two initializers,
6006 but braces are not elided. */
6009 {
6011 {
6014 else
6016 }
6017 }
6019 {
6027 }
6029 }
6031 /* A non-aggregate type is always initialized with a single
6032 initializer. */
6034 {
6035 /* It is invalid to initialize a non-aggregate type with a
6036 brace-enclosed initializer before C++0x.
6037 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
6038 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
6039 a CONSTRUCTOR (with a record type). */
6041 /* Don't complain about a capture-init. */
6044 {
6046 {
6048 /* Isn't value-initialization. */
6050 {
6053 type);
6055 }
6056 }
6057 else
6059 }
6063 }
6065 /* "If T is a class type and the initializer list has a single element of
6066 type cv U, where U is T or a class derived from T, the object is
6067 initialized from that element." Even if T is an aggregate. */
6069 && first_initializer_p
6072 {
6075 }
6077 /* [dcl.init.aggr]
6079 All implicit type conversions (clause _conv_) are considered when
6080 initializing the aggregate member with an initializer from an
6081 initializer-list. If the initializer can initialize a member,
6082 the member is initialized. Otherwise, if the member is itself a
6083 non-empty subaggregate, brace elision is assumed and the
6084 initializer is considered for the initialization of the first
6085 member of the subaggregate. */
6087 /* But don't try this for the first initializer, since that would be
6088 looking through the outermost braces; A a2 = { a1 }; is not a
6089 valid aggregate initialization. */
6090 && !first_initializer_p
6093 complain)))
6094 {
6097 }
6099 /* [dcl.init.string]
6101 A char array (whether plain char, signed char, or unsigned char)
6102 can be initialized by a string-literal (optionally enclosed in
6103 braces); a wchar_t array can be initialized by a wide
6104 string-literal (optionally enclosed in braces). */
6107 {
6110 /* Strip one level of braces if and only if they enclose a single
6111 element (as allowed by [dcl.init.string]). */
6115 {
6117 }
6119 /* If it's a string literal, then it's the initializer for the array
6120 as a whole. Otherwise, continue with normal initialization for
6121 array types (one value per array element). */
6123 {
6128 }
6129 }
6131 /* The following cases are about aggregates. If we are not within a full
6132 initializer already, and there is not a CONSTRUCTOR, it means that there
6133 is a missing set of braces (that is, we are processing the case for
6134 which reshape_init exists). */
6136 {
6138 {
6140 /* There is no need to reshape pointer-to-member function
6141 initializers, as they are always constructed correctly
6142 by the front end. */
6143 ;
6145 /* For a nested compound literal, there is no need to reshape since
6146 brace elision is not allowed. Even if we decided to allow it,
6147 we should add a call to reshape_init in finish_compound_literal,
6148 before calling digest_init, so changing this code would still
6149 not be necessary. */
6151 else
6152 {
6156 }
6157 }
6162 type);
6163 }
6165 /* Dispatch to specialized routines. */
6172 else
6174 }
6176 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
6177 brace-enclosed aggregate initializer.
6179 INIT is the CONSTRUCTOR containing the list of initializers describing
6180 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
6181 It may not presently match the shape of the TYPE; for example:
6183 struct S { int a; int b; };
6184 struct S a[] = { 1, 2, 3, 4 };
6186 Here INIT will hold a vector of four elements, rather than a
6187 vector of two elements, each itself a vector of two elements. This
6188 routine transforms INIT from the former form into the latter. The
6189 revised CONSTRUCTOR node is returned. */
6191 tree
6193 {
6195 reshape_iter d;
6196 tree new_init;
6202 /* An empty constructor does not need reshaping, and it is always a valid
6203 initializer. */
6207 /* Handle [dcl.init.list] direct-list-initialization from
6208 single element of enumeration with a fixed underlying type. */
6210 {
6214 {
6218 }
6219 else
6221 }
6223 /* Recurse on this CONSTRUCTOR. */
6231 /* Make sure all the element of the constructor were used. Otherwise,
6232 issue an error about exceeding initializers. */
6234 {
6238 }
6245 }
6247 /* Verify array initializer. Returns true if errors have been reported. */
6249 bool
6251 {
6254 /* The array type itself need not be complete, because the
6255 initializer may tell us how many elements are in the array.
6256 But, the elements of the array must be complete. */
6258 {
6262 else
6265 }
6266 /* A compound literal can't have variable size. */
6270 {
6273 }
6275 }
6277 /* Subroutine of check_initializer; args are passed down from that function.
6278 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
6280 static tree
6283 {
6286 }
6288 /* Verify INIT (the initializer for DECL), and record the
6289 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
6290 grok_reference_init.
6292 If the return value is non-NULL, it is an expression that must be
6293 evaluated dynamically to initialize DECL. */
6295 static tree
6297 {
6300 tree core_type;
6302 /* Things that are going to be initialized need to have complete
6303 type. */
6307 {
6308 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
6309 it doesn't have storage to be initialized. */
6312 }
6315 /* We will have already complained. */
6319 {
6322 }
6324 {
6329 }
6330 else
6331 /* There is no way to make a variable-sized class type in GNU C++. */
6335 {
6338 {
6340 {
6343 }
6345 {
6347 "scalar object %qD requires one element in "
6351 }
6352 }
6353 }
6356 {
6363 }
6365 ;
6368 {
6370 {
6373 }
6376 tf_warning_or_error);
6377 /* Do not reshape constructors of vectors (they don't need to be
6378 reshaped. */
6380 {
6382 {
6384 tf_warning_or_error);
6386 }
6388 {
6389 /* Don't reshape if the class has constructors. */
6392 "in C++98 %qD must be initialized by "
6394 decl);
6395 }
6397 {
6400 }
6401 else
6402 {
6405 }
6406 }
6410 {
6413 /* We get here with code like `int a (2);' */
6415 tf_warning_or_error);
6416 }
6418 /* If DECL has an array type without a specific bound, deduce the
6419 array size from the initializer. */
6433 {
6436 /* A constructor call is a non-trivial initializer even if
6437 it isn't explicitly written. */
6441 /* If this is a constexpr initializer, expand_default_init will
6442 have returned an INIT_EXPR rather than a CALL_EXPR. In that
6443 case, pull the initializer back out and pass it down into
6444 store_init_value. */
6449 {
6452 /* Don't call digest_init; it's unnecessary and will complain
6453 about aggregate initialization of non-aggregate classes. */
6455 }
6457 {
6458 /* Declared constexpr, but no suitable initializer; massage
6459 init appropriately so we can pass it into store_init_value
6460 for the error. */
6463 {
6467 }
6469 }
6470 else
6472 }
6475 {
6476 /* In aggregate initialization of a variable, each element
6477 initialization is a full-expression because there is no
6478 enclosing expression. */
6486 {
6491 }
6503 }
6504 }
6505 else
6506 {
6514 tf_warning_or_error);
6515 }
6521 {
6522 /* We might have set these in cp_finish_decl. */
6525 }
6531 {
6539 else
6543 {
6547 }
6549 }
6552 }
6554 /* If DECL is not a local variable, give it RTL. */
6556 static void
6558 {
6562 /* Set the DECL_ASSEMBLER_NAME for the object. */
6564 {
6565 /* The `register' keyword, when used together with an
6566 asm-specification, indicates that the variable should be
6567 placed in a particular register. */
6569 {
6572 }
6573 else
6574 {
6579 }
6580 }
6582 /* Handle non-variables up front. */
6584 {
6587 }
6589 /* If we see a class member here, it should be a static data
6590 member. */
6592 {
6594 /* An in-class declaration of a static data member should be
6595 external; it is only a declaration, and not a definition. */
6600 }
6602 /* We don't create any RTL for local variables. */
6606 /* We defer emission of local statics until the corresponding
6607 DECL_EXPR is expanded. But with constexpr its function might never
6608 be expanded, so go ahead and tell cgraph about the variable now. */
6613 /* Defer template instantiations. */
6618 /* If we're not deferring, go ahead and assemble the variable. */
6621 }
6623 /* walk_tree helper for wrap_temporary_cleanups, below. */
6625 static tree
6627 {
6628 /* Stop at types or full-expression boundaries. */
6631 {
6634 }
6637 {
6642 /* Tell honor_protect_cleanup_actions to handle this as a separate
6643 cleanup. */
6647 }
6650 }
6652 /* We're initializing a local variable which has a cleanup GUARD. If there
6653 are any temporaries used in the initializer INIT of this variable, we
6654 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
6655 variable will be cleaned up properly if one of them throws.
6657 Unfortunately, there's no way to express this properly in terms of
6658 nesting, as the regions for the temporaries overlap the region for the
6659 variable itself; if there are two temporaries, the variable needs to be
6660 the first thing destroyed if either of them throws. However, we only
6661 want to run the variable's cleanup if it actually got constructed. So
6662 we need to guard the temporary cleanups with the variable's cleanup if
6663 they are run on the normal path, but not if they are run on the
6664 exceptional path. We implement this by telling
6665 honor_protect_cleanup_actions to strip the variable cleanup from the
6666 exceptional path. */
6668 static void
6670 {
6672 }
6674 /* Generate code to initialize DECL (a local variable). */
6676 static void
6678 {
6680 tree cleanup;
6688 {
6689 /* If we used it already as memory, it must stay in memory. */
6693 }
6698 /* Compute and store the initial value. */
6703 /* Generate a cleanup, if necessary. */
6706 /* Perform the initialization. */
6708 {
6712 {
6713 /* Stick simple initializers in DECL_INITIAL so that
6714 -Wno-init-self works (c++/34772). */
6719 {
6723 OPT_Winit_self,
6725 }
6726 }
6727 else
6728 {
6731 /* If we're only initializing a single object, guard the
6732 destructors of any temporaries used in its initializer with
6733 its destructor. This isn't right for arrays because each
6734 element initialization is a full-expression. */
6743 saved_stmts_are_full_exprs_p;
6744 }
6745 }
6747 /* Set this to 0 so we can tell whether an aggregate which was
6748 initialized was ever used. Don't do this if it has a
6749 destructor, so we don't complain about the 'resource
6750 allocation is initialization' idiom. Now set
6751 attribute((unused)) on types so decls of that type will be
6752 marked used. (see TREE_USED, above.) */
6754 && ! already_used
6763 }
6765 /* DECL is a VAR_DECL for a compiler-generated variable with static
6766 storage duration (like a virtual table) whose initializer is a
6767 compile-time constant. Initialize the variable and provide it to the
6768 back end. */
6770 void
6772 {
6773 tree init;
6779 /* Mark the decl as constexpr so that we can access its content
6780 at compile time. */
6787 }
6789 /* INIT is the initializer for a variable, as represented by the
6790 parser. Returns true iff INIT is value-dependent. */
6792 static bool
6794 {
6796 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
6799 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
6800 {
6813 }
6814 else
6815 /* It must be a simple expression, e.g., int i = 3; */
6819 }
6821 // Returns true if a DECL is VAR_DECL with the concept specifier.
6824 {
6826 // Not all variables have DECL_LANG_SPECIFIC.
6829 }
6831 /* A helper function to be called via walk_tree. If any label exists
6832 under *TP, it is (going to be) forced. Set has_forced_label_in_static. */
6834 static tree
6836 {
6842 }
6844 /* Finish processing of a declaration;
6845 install its line number and initial value.
6846 If the length of an array type is not known before,
6847 it must be determined now, from the initial value, or it is an error.
6849 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
6850 true, then INIT is an integral constant expression.
6852 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
6853 if the (init) syntax was used. */
6855 void
6858 {
6859 tree type;
6864 tree auto_node;
6869 {
6873 }
6876 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
6883 /* Warn about register storage specifiers except when in GNU global
6884 or local register variable extension. */
6886 {
6889 "ISO C++17 does not allow %<register%> storage "
6891 else
6894 }
6896 /* If a name was specified, get the string. */
6909 /* Do auto deduction unless decl is a function or an uninstantiated
6910 template specialization. */
6917 {
6918 tree d_init;
6923 {
6927 tf_warning_or_error);
6929 }
6939 {
6944 }
6946 }
6949 {
6952 {
6955 }
6956 }
6964 {
6965 tree clone;
6967 {
6968 /* FIXME check this is 1st decl. */
6973 {
6977 }
6979 }
6981 {
6984 else
6986 }
6987 }
6990 {
6992 /* If DECL is a reference, then we want to know whether init is a
6993 reference constant; init_const_expr_p as passed tells us whether
6994 it's an rvalue constant. */
6998 {
6999 /* Set these flags now for templates. We'll update the flags in
7000 store_init_value for instantiations. */
7003 /* FIXME setting TREE_CONSTANT on refs breaks the back end. */
7006 }
7007 }
7010 {
7013 /* Add this declaration to the statement-tree. */
7020 {
7023 }
7025 /* Generally, initializers in templates are expanded when the
7026 template is instantiated. But, if DECL is a variable constant
7027 then it can be used in future constant expressions, so its value
7028 must be available. */
7035 {
7038 }
7040 && init_const_expr_p
7044 {
7045 /* This variable seems to be a non-dependent constant, so process
7046 its initializer. If check_initializer returns non-null the
7047 initialization wasn't constant after all. */
7048 tree init_code;
7054 }
7056 {
7057 /* Deduce array size even if the initializer is dependent. */
7059 /* And complain about multiple initializers. */
7063 tf_warning_or_error);
7064 }
7070 {
7073 }
7075 }
7077 /* Just store non-static data member initializers for later. */
7081 /* Take care of TYPE_DECLs up front. */
7083 {
7086 {
7090 }
7092 /* If we have installed this as the canonical typedef for this
7093 type, and that type has not been defined yet, delay emitting
7094 the debug information for it, as we will emit it later. */
7100 at_eof);
7102 }
7104 /* A reference will be modified here, as it is initialized. */
7108 {
7111 }
7114 {
7115 /* If this is a local variable that will need a mangled name,
7116 register it now. We must do this before processing the
7117 initializer for the variable, since the initialization might
7118 require a guard variable, and since the mangled name of the
7119 guard variable will depend on the mangled name of this
7120 variable. */
7124 {
7126 /* Normally has_forced_label_in_static is set during GIMPLE
7127 lowering, but [cd]tors are never actually compiled directly.
7128 We need to set this early so we can deal with the label
7129 address extension. */
7133 {
7136 }
7137 /* And make sure it's in the symbol table for
7138 c_parse_final_cleanups to find. */
7140 }
7142 /* Convert the initializer to the type of DECL, if we have not
7143 already initialized DECL. */
7145 /* If !DECL_EXTERNAL then DECL is being defined. In the
7146 case of a static data member initialized inside the
7147 class-specifier, there can be an initializer even if DECL
7148 is *not* defined. */
7150 {
7154 /* Handle:
7156 [dcl.init]
7158 The memory occupied by any object of static storage
7159 duration is zero-initialized at program startup before
7160 any other initialization takes place.
7162 We cannot create an appropriate initializer until after
7163 the type of DECL is finalized. If DECL_INITIAL is set,
7164 then the DECL is statically initialized, and any
7165 necessary zero-initialization has already been performed. */
7170 /* Remember that the initialization for this variable has
7171 taken place. */
7173 /* This declaration is the definition of this variable,
7174 unless we are initializing a static data member within
7175 the class specifier. */
7178 }
7179 /* If the variable has an array type, lay out the type, even if
7180 there is no initializer. It is valid to index through the
7181 array, and we must get TYPE_ALIGN set correctly on the array
7182 type. */
7189 /* So decl is a global variable or a static member of a
7190 non local class. Record the types it uses
7191 so that we can decide later to emit debug info for them. */
7193 }
7195 /* Add this declaration to the statement-tree. This needs to happen
7196 after the call to check_initializer so that the DECL_EXPR for a
7197 reference temp is added before the DECL_EXPR for the reference itself. */
7199 {
7200 /* If we're building a variable sized type, and we might be
7201 reachable other than via the top of the current binding
7202 level, then create a new BIND_EXPR so that we deallocate
7203 the object at the right time. */
7208 {
7209 tree bind;
7214 }
7216 }
7218 /* Let the middle end know about variables and functions -- but not
7219 static data members in uninstantiated class templates. */
7221 {
7223 {
7226 }
7228 /* This needs to happen after the linkage is set. */
7232 {
7233 /* If a TREE_READONLY variable needs initialization
7234 at runtime, it is no longer readonly and we need to
7235 avoid MEM_READONLY_P being set on RTL created for it. */
7237 {
7241 }
7245 /* Likewise if it needs destruction. */
7248 }
7252 /* Check for abstractness of the type. Notice that there is no
7253 need to strip array types here since the check for those types
7254 is already done within create_array_type_for_decl. */
7258 /* No initialization required. */
7259 ;
7261 {
7263 {
7265 {
7266 /* An out-of-class default definition is defined at
7267 the point where it is explicitly defaulted. */
7272 }
7273 else
7275 }
7276 /* else no initialization required. */
7277 }
7281 {
7284 }
7285 /* A variable definition. */
7287 /* Initialize the local variable. */
7290 /* If a variable is defined, and then a subsequent
7291 definition with external linkage is encountered, we will
7292 get here twice for the same variable. We want to avoid
7293 calling expand_static_init more than once. For variables
7294 that are not static data members, we can call
7295 expand_static_init only when we actually process the
7296 initializer. It is not legal to redeclare a static data
7297 member, so this issue does not arise in that case. */
7300 }
7302 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
7303 reference, insert it in the statement-tree now. */
7305 {
7310 }
7319 {
7326 decl);
7334 }
7337 }
7339 /* For class TYPE return itself or some its bases that contain
7340 any direct non-static data members. Return error_mark_node if an
7341 error has been diagnosed. */
7343 static tree
7345 {
7355 {
7359 else
7364 }
7366 {
7374 }
7375 else
7385 {
7390 {
7392 {
7397 }
7401 {
7403 "classes %qT and %qT have non-static data "
7406 }
7407 else
7409 }
7410 }
7412 }
7414 /* Return std::tuple_size<TYPE>::value. */
7416 static tree
7418 {
7434 else
7436 }
7438 /* Return std::tuple_element<I,TYPE>::type. */
7440 static tree
7442 {
7450 tf_warning_or_error);
7453 }
7455 /* Return e.get<i>() or get<i>(e). */
7457 static tree
7459 {
7466 /* [The id-expression] e is an lvalue if the type of the entity e is an
7467 lvalue reference and an xvalue otherwise. */
7476 /* To use a member get, member lookup must find at least one
7477 declaration that is a function template
7478 whose first template parameter is a non-type parameter. */
7480 {
7483 {
7487 {
7490 }
7491 }
7492 }
7495 {
7500 }
7501 else
7502 {
7508 }
7509 }
7511 /* It's impossible to recover the decltype of a tuple decomposition variable
7512 based on the actual type of the variable, so store it in a hash table. */
7515 static void
7517 {
7521 }
7523 tree
7525 {
7527 }
7529 /* Mangle a decomposition declaration if needed. Arguments like
7530 in cp_finish_decomp. */
7532 void
7534 {
7538 {
7546 }
7547 }
7549 /* Finish a decomposition declaration. DECL is the underlying declaration
7550 "e", FIRST is the head of a chain of decls for the individual identifiers
7551 chained through DECL_CHAIN in reverse order and COUNT is the number of
7552 those decls. */
7554 void
7556 {
7558 {
7559 error_out:
7561 {
7564 {
7567 }
7569 }
7573 }
7577 /* This happens for range for when not in templates.
7578 Still add the DECL_VALUE_EXPRs for later processing. */
7579 || (!processing_template_decl
7581 {
7583 {
7585 {
7591 }
7595 }
7597 }
7603 {
7606 }
7612 {
7618 {
7620 type);
7622 }
7623 }
7628 {
7629 tree nelts;
7634 {
7637 }
7640 {
7641 cnt_mismatch:
7646 else
7655 }
7658 {
7666 NULL_TREE);
7669 }
7670 }
7671 /* 2 GNU extensions. */
7673 {
7679 {
7687 t);
7690 }
7691 }
7693 {
7695 {
7698 }
7703 {
7713 NULL_TREE);
7716 }
7717 }
7719 {
7721 {
7725 }
7727 {
7734 }
7740 {
7751 {
7755 }
7756 /* Save the decltype away before reference collapse. */
7762 {
7763 /* In this case the names are variables, not just proxies. */
7766 }
7770 }
7771 /* Ignore reads from the underlying decl performed during initialization
7772 of the individual variables. If those will be read, we'll mark
7773 the underlying decl as read at that point. */
7775 }
7777 {
7780 }
7782 {
7785 }
7787 {
7790 }
7793 type);
7794 else
7795 {
7800 {
7804 }
7810 else
7811 eltscnt++;
7816 {
7820 }
7827 else
7828 {
7830 NULL_TREE);
7836 {
7839 }
7840 i++;
7841 }
7842 }
7844 {
7847 {
7852 }
7853 }
7854 }
7856 /* Returns a declaration for a VAR_DECL as if:
7858 extern "C" TYPE NAME;
7860 had been seen. Used to create compiler-generated global
7861 variables. */
7863 static tree
7865 {
7866 tree decl;
7874 /* If the user has explicitly declared this variable (perhaps
7875 because the code we are compiling is part of a low-level runtime
7876 library), then it is possible that our declaration will be merged
7877 with theirs by pushdecl. */
7883 }
7885 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
7886 if "__cxa_atexit" is not being used) corresponding to the function
7887 to be called when the program exits. */
7889 static tree
7891 {
7892 tree fn_type;
7895 {
7896 tree arg_type;
7899 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
7901 else
7902 /* The parameter to "atexit" is "void (*)(void)". */
7908 }
7911 }
7913 /* Returns a pointer to the `atexit' function. Note that if
7914 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
7915 `__cxa_atexit' function specified in the IA64 C++ ABI. */
7917 static tree
7919 {
7920 tree atexit_fndecl;
7921 tree fn_type;
7922 tree fn_ptr_type;
7930 {
7931 /* The declaration for `__cxa_atexit' is:
7933 int __cxa_atexit (void (*)(void *), void *, void *)
7935 We build up the argument types and then the function type
7936 itself. */
7940 /* First, build the pointer-to-function type for the first
7941 argument. */
7943 /* Then, build the rest of the argument types. */
7946 {
7949 }
7950 else
7951 {
7954 }
7955 /* And the final __cxa_atexit type. */
7958 NULL_TREE);
7961 else
7963 }
7964 else
7965 {
7966 /* The declaration for `atexit' is:
7968 int atexit (void (*)());
7970 We build up the argument types and then the function type
7971 itself. */
7973 /* Build the final atexit type. */
7977 }
7979 /* Now, build the function declaration. */
7987 }
7989 /* Like get_atexit_node, but for thread-local cleanups. */
7991 static tree
7993 {
7994 /* The declaration for `__cxa_thread_atexit' is:
7996 int __cxa_thread_atexit (void (*)(void *), void *, void *) */
8000 NULL_TREE);
8002 /* Now, build the function declaration. */
8006 }
8008 /* Returns the __dso_handle VAR_DECL. */
8010 static tree
8012 {
8016 /* Declare the variable. */
8018 ptr_type_node);
8020 #ifdef HAVE_GAS_HIDDEN
8022 {
8025 }
8026 #endif
8029 }
8031 /* Begin a new function with internal linkage whose job will be simply
8032 to destroy some particular variable. */
8036 static tree
8038 {
8040 tree fntype;
8041 tree fndecl;
8047 /* No need to mangle this. */
8050 /* Build the name of the function. */
8052 /* Build the function declaration. */
8055 /* It's a function with internal linkage, generated by the
8056 compiler. */
8059 /* Make the function `inline' so that it is only emitted if it is
8060 actually needed. It is unlikely that it will be inlined, since
8061 it is only called via a function pointer, but we avoid unnecessary
8062 emissions this way. */
8065 /* Build the parameter. */
8067 {
8072 }
8080 }
8082 /* Finish the cleanup function begun by start_cleanup_fn. */
8084 static void
8086 {
8090 }
8092 /* Generate code to handle the destruction of DECL, an object with
8093 static storage duration. */
8095 tree
8097 {
8098 tree cleanup;
8099 tree addr;
8100 tree compound_stmt;
8101 tree fcall;
8102 tree type;
8105 tree atex_node;
8111 /* If we're using "__cxa_atexit" (or "__cxa_thread_atexit" or
8112 "__aeabi_atexit"), and DECL is a class object, we can just pass the
8113 destructor to "__cxa_atexit"; we don't have to build a temporary
8114 function to do the cleanup. */
8115 dso_parm = (flag_use_cxa_atexit
8120 {
8123 /* Make sure it is accessible. */
8125 tf_warning_or_error);
8126 }
8127 else
8128 {
8129 /* Call build_cleanup before we enter the anonymous function so
8130 that any access checks will be done relative to the current
8131 scope, rather than the scope of the anonymous function. */
8134 /* Now start the function. */
8137 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
8138 to the original function, rather than the anonymous one. That
8139 will make the back end think that nested functions are in use,
8140 which causes confusion. */
8145 /* Create the body of the anonymous function. */
8150 }
8152 /* Call atexit with the cleanup function. */
8158 else
8162 {
8163 /* We must convert CLEANUP to the type that "__cxa_atexit"
8164 expects. */
8166 /* "__cxa_atexit" will pass the address of DECL to the
8167 cleanup function. */
8170 /* The declared type of the parameter to "__cxa_atexit" is
8171 "void *". For plain "T*", we could just let the
8172 machinery in cp_build_function_call convert it -- but if the
8173 type is "cv-qualified T *", then we need to convert it
8174 before passing it in, to avoid spurious errors. */
8176 }
8177 else
8178 /* Since the cleanup functions we build ignore the address
8179 they're given, there's no reason to pass the actual address
8180 in, and, in general, it's cheaper to pass NULL than any
8181 other value. */
8186 tf_warning_or_error);
8188 /* Just pass NULL to the dso handle parm if we don't actually
8189 have a DSO handle on this target. */
8191 else
8195 {
8198 {
8201 }
8202 else
8203 {
8206 }
8207 }
8208 else
8209 {
8212 }
8215 }
8217 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
8218 is its initializer. Generate code to handle the construction
8219 and destruction of DECL. */
8221 static void
8223 {
8227 /* Some variables require no dynamic initialization. */
8229 {
8230 /* Make sure the destructor is callable. */
8234 }
8238 {
8242 else
8247 {
8249 "C++11 %<thread_local%> allows dynamic initialization "
8252 }
8254 }
8257 {
8258 /* Emit code to perform this initialization but once. */
8263 /* We don't need thread-safety code for thread-local vars. */
8267 /* Emit code to perform this initialization but once. This code
8268 looks like:
8270 static <type> guard;
8271 if (!__atomic_load (guard.first_byte)) {
8272 if (__cxa_guard_acquire (&guard)) {
8273 bool flag = false;
8274 try {
8275 // Do initialization.
8276 flag = true; __cxa_guard_release (&guard);
8277 // Register variable for destruction at end of program.
8278 } catch {
8279 if (!flag) __cxa_guard_abort (&guard);
8280 }
8281 }
8282 }
8284 Note that the `flag' variable is only set to 1 *after* the
8285 initialization is complete. This ensures that an exception,
8286 thrown during the construction, will cause the variable to
8287 reinitialized when we pass through this code again, as per:
8289 [stmt.dcl]
8291 If the initialization exits by throwing an exception, the
8292 initialization is not complete, so it will be tried again
8293 the next time control enters the declaration.
8295 This process should be thread-safe, too; multiple threads
8296 should not be able to initialize the variable more than
8297 once. */
8299 /* Create the guard variable. */
8302 /* Begin the conditional initialization. */
8309 {
8322 acquire_fn = push_library_fn
8325 NULL_TREE),
8330 NULL_TREE);
8340 inner_if_stmt);
8348 void_node,
8352 /* Do the initialization itself. */
8354 init = add_stmt_to_compound
8356 init = add_stmt_to_compound
8358 }
8359 else
8362 /* Use atexit to register a function for destroying this static
8363 variable. */
8369 {
8373 }
8378 }
8381 else
8383 }
8385 \f
8386 /* Make TYPE a complete type based on INITIAL_VALUE.
8387 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
8388 2 if there was no information (in which case assume 0 if DO_DEFAULT),
8389 3 if the initializer list is empty (in pedantic mode). */
8391 int
8393 {
8397 /* Don't get confused by a CONSTRUCTOR for some other type. */
8404 {
8406 tree value;
8408 /* An array of character type can be initialized from a
8409 brace-enclosed string constant.
8411 FIXME: this code is duplicated from reshape_init. Probably
8412 we should just call reshape_init here? */
8416 {
8423 }
8425 /* If any of the elements are parameter packs, we can't actually
8426 complete this type now because the array size is dependent. */
8428 {
8431 {
8434 }
8435 }
8436 }
8440 /* We can create the array before the element type is complete, which
8441 means that we didn't have these two bits set in the original type
8442 either. In completing the type, we are expected to propagate these
8443 bits. See also complete_type which does the same thing for arrays
8444 of fixed size. */
8447 {
8452 }
8455 }
8457 /* As above, but either give an error or reject zero-size arrays, depending
8458 on COMPLAIN. */
8460 int
8463 {
8466 /* In SFINAE context we can't be lenient about zero-size arrays. */
8473 {
8479 {
8482 }
8486 }
8488 }
8489 \f
8490 /* Return zero if something is declared to be a member of type
8491 CTYPE when in the context of CUR_TYPE. STRING is the error
8492 message to print in that case. Otherwise, quietly return 1. */
8494 static int
8496 {
8498 {
8501 else
8504 }
8506 }
8507 \f
8508 /* Subroutine of `grokdeclarator'. */
8510 /* Generate errors possibly applicable for a given set of specifiers.
8511 This is for ARM $7.1.2. */
8513 static void
8522 {
8524 {
8568 }
8572 && !flag_noexcept_type
8578 }
8580 /* DECL is a member function or static data member and is presently
8581 being defined. Check that the definition is taking place in a
8582 valid namespace. */
8584 static void
8586 {
8587 /* These checks only apply to member functions and static data
8588 members. */
8590 /* We check for problems with specializations in pt.c in
8591 check_specialization_namespace, where we can issue better
8592 diagnostics. */
8595 /* We check this in check_explicit_instantiation_namespace. */
8598 /* [class.mfct]
8600 A member function definition that appears outside of the
8601 class definition shall appear in a namespace scope enclosing
8602 the class definition.
8604 [class.static.data]
8606 The definition for a static data member shall appear in a
8607 namespace scope enclosing the member's class definition. */
8611 }
8613 /* Build a PARM_DECL for the "this" parameter of FN. TYPE is the
8614 METHOD_TYPE for a non-static member function; QUALS are the
8615 cv-qualifiers that apply to the function. */
8617 tree
8619 {
8620 tree this_type;
8621 tree qual_type;
8622 tree parm;
8623 cp_cv_quals this_quals;
8626 {
8627 this_type
8630 }
8631 else
8633 /* The `this' parameter is implicitly `const'; it cannot be
8634 assigned to. */
8640 }
8642 /* DECL is a static member function. Complain if it was declared
8643 with function-cv-quals. */
8645 static void
8647 {
8650 decl);
8651 }
8653 // Check that FN takes no arguments and returns bool.
8654 static void
8656 {
8657 // A constraint is nullary.
8662 // The declared return type of the concept shall be bool, and
8663 // it shall not be deduced from it definition.
8671 }
8673 /* Helper function. Replace the temporary this parameter injected
8674 during cp_finish_omp_declare_simd with the real this parameter. */
8676 static tree
8678 {
8687 }
8689 /* CTYPE is class type, or null if non-class.
8690 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
8691 or METHOD_TYPE.
8692 DECLARATOR is the function's name.
8693 PARMS is a chain of PARM_DECLs for the function.
8694 VIRTUALP is truthvalue of whether the function is virtual or not.
8695 FLAGS are to be passed through to `grokclassfn'.
8696 QUALS are qualifiers indicating whether the function is `const'
8697 or `volatile'.
8698 RAISES is a list of exceptions that this function can raise.
8699 CHECK is 1 if we must find this method in CTYPE, 0 if we should
8700 not look, and -1 if we should not call `grokclassfn' at all.
8702 SFK is the kind of special function (if any) for the new function.
8704 Returns `NULL_TREE' if something goes wrong, after issuing
8705 applicable error messages. */
8707 static tree
8709 tree type,
8710 tree declarator,
8711 tree parms,
8712 tree orig_declarator,
8714 tree decl_reqs,
8717 cp_cv_quals quals,
8718 cp_ref_qualifier rqual,
8719 tree raises,
8725 special_function_kind sfk,
8729 tree in_namespace,
8731 location_t location)
8732 {
8733 tree decl;
8735 tree t;
8740 // Was the concept specifier present?
8743 // Concept declarations must have a corresponding definition.
8745 {
8748 }
8754 /* Set the constraints on the declaration. */
8756 {
8761 /* Adjust the required expression into a constraint. */
8767 }
8770 {
8775 /* Allocate space to hold the vptr bit if needed. */
8777 }
8783 /* Propagate volatile out from type to decl. */
8787 /* Setup decl according to sfk. */
8789 {
8802 }
8805 {
8809 orig_declarator);
8810 else
8811 {
8816 {
8817 /* Something like `template <class T> friend void f<T>()'. */
8819 "invalid use of template-id %qD in declaration "
8821 orig_declarator);
8823 }
8826 /* A friend declaration of the form friend void f<>(). Record
8827 the information in the TEMPLATE_ID_EXPR. */
8836 {
8838 "default arguments are not allowed in declaration "
8840 decl);
8842 }
8845 {
8847 "%<inline%> is not allowed in declaration of friend "
8849 decl);
8851 }
8852 }
8853 }
8855 /* C++17 11.3.6/4: "If a friend declaration specifies a default argument
8856 expression, that declaration shall be a definition..." */
8858 {
8862 {
8864 "friend declaration of %qD specifies default "
8867 }
8868 }
8870 /* If this decl has namespace scope, set that up. */
8876 /* `main' and builtins have implicit 'C' linkage. */
8891 /* Should probably propagate const out from type to decl I bet (mrs). */
8893 {
8896 }
8902 {
8906 }
8909 {
8922 }
8924 /* Members of anonymous types and local classes have no linkage; make
8925 them internal. If a typedef is made later, this will be changed. */
8931 {
8932 /* [basic.link]: A name with no linkage (notably, the name of a class
8933 or enumeration declared in a local scope) shall not be used to
8934 declare an entity with linkage.
8936 DR 757 relaxes this restriction for C++0x. */
8938 }
8942 {
8945 }
8947 /* If the declaration was declared inline, mark it as such. */
8949 {
8953 }
8957 // If the concept declaration specifier was found, check
8958 // that the declaration satisfies the necessary requirements.
8960 {
8963 }
8967 {
8970 TYPE_UNQUALIFIED,
8971 REF_QUAL_NONE);
8974 {
8978 decl);
8980 }
8983 {
8987 decl);
8989 }
8990 }
8993 {
8995 {
8999 }
9003 }
9008 {
9012 /* [over.literal]/6: Literal operators shall not have C linkage. */
9014 {
9018 }
9021 {
9024 {
9027 }
9031 {
9035 }
9037 {
9041 }
9042 /* 17.6.3.3.5 */
9047 "literal operator suffixes not preceded by %<_%>"
9049 }
9050 else
9051 {
9054 }
9055 }
9058 /* Make the init_value nonzero so pushdecl knows this is not
9059 tentative. error_mark_node is replaced later with the BLOCK. */
9066 {
9067 /* Adjust "omp declare simd" attributes. */
9070 {
9071 tree attr;
9074 {
9079 {
9081 cl = c_omp_declare_simd_clauses_to_numbers
9085 else
9087 }
9088 }
9089 }
9090 }
9092 /* Caller will do the rest of this. */
9099 /* 12.4/3 */
9107 template_count,
9119 {
9122 }
9124 /* Check main's type after attributes have been applied. */
9126 {
9128 integer_type_node))
9129 {
9131 tree newtype;
9136 }
9139 }
9142 {
9144 (processing_template_decl
9146 ? current_template_parms
9153 {
9154 tree ok;
9155 tree pushed_scope;
9158 /* Because grokfndecl is always supposed to return a
9159 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
9160 here. We depend on our callers to figure out that its
9161 really a template that's being returned. */
9166 {
9167 /* Remove the `this' parm added by grokclassfn. */
9170 }
9172 {
9175 }
9177 {
9182 }
9184 /* Since we've smashed OLD_DECL to its
9185 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
9189 /* Attempt to merge the declarations. This can fail, in
9190 the case of some invalid specialization declarations. */
9196 {
9200 }
9204 }
9205 }
9217 }
9219 /* decl is a FUNCTION_DECL.
9220 specifiers are the parsed virt-specifiers.
9222 Set flags to reflect the virt-specifiers.
9224 Returns decl. */
9226 static tree
9228 {
9236 }
9238 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
9239 the linkage that DECL will receive in the object file. */
9241 static void
9243 {
9244 /* A static data member always has static storage duration and
9245 external linkage. Note that static data members are forbidden in
9246 local classes -- the only situation in which a class has
9247 non-external linkage. */
9250 /* For non-template classes, static data members are always put
9251 out in exactly those files where they are defined, just as
9252 with ordinary namespace-scope variables. */
9255 }
9257 /* Create a VAR_DECL named NAME with the indicated TYPE.
9259 If SCOPE is non-NULL, it is the class type or namespace containing
9260 the variable. If SCOPE is NULL, the variable should is created in
9261 the innermost enclosing scope. */
9263 static tree
9265 tree name,
9266 tree orig_declarator,
9273 tree scope)
9274 {
9275 tree decl;
9276 tree explicit_scope;
9283 /* Compute the scope in which to place the variable, but remember
9284 whether or not that scope was explicitly specified by the user. */
9287 {
9288 /* An explicit "extern" specifier indicates a namespace-scope
9289 variable. */
9294 }
9298 template, we need DECL_LANG_SPECIFIC. */
9300 /* Similarly for namespace-scope variables with language linkage
9301 other than C++. */
9304 /* Similarly for static data members. */
9306 /* Similarly for explicit specializations. */
9307 || (orig_declarator
9310 else
9315 else
9319 {
9322 }
9325 {
9327 /* This function is only called with out-of-class definitions. */
9330 }
9331 /* At top level, either `static' or no s.c. makes a definition
9332 (perhaps tentative), and absence of `static' makes it public. */
9334 {
9337 || ! constp
9338 || volatilep
9341 }
9342 /* Not at top level, only `static' makes a static definition. */
9343 else
9344 {
9347 }
9350 {
9352 {
9356 }
9359 }
9361 /* If the type of the decl has no linkage, make sure that we'll
9362 notice that in mark_used. */
9371 {
9372 /* [basic.link]: A name with no linkage (notably, the name of a class
9373 or enumeration declared in a local scope) shall not be used to
9374 declare an entity with linkage.
9376 DR 757 relaxes this restriction for C++0x. */
9379 }
9380 else
9388 /* Check that the variable can be safely declared as a concept.
9389 Note that this also forbids explicit specializations. */
9391 {
9393 {
9397 }
9398 else
9403 }
9406 {
9410 }
9412 // Handle explicit specializations and instantiations of variable templates.
9418 }
9420 /* Create and return a canonical pointer to member function type, for
9421 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
9423 tree
9425 {
9427 tree t;
9432 /* Make sure that we always have the unqualified pointer-to-member
9433 type first. */
9435 {
9438 }
9440 /* If a canonical type already exists for this type, use it. We use
9441 this method instead of type_hash_canon, because it only does a
9442 simple equality check on the list of field members. */
9450 /* Let the front end know this is a pointer to member function. */
9457 delta_type_node);
9463 /* Zap out the name so that the back end will give us the debugging
9464 information for this anonymous RECORD_TYPE. */
9467 /* Cache this pointer-to-member type so that we can find it again
9468 later. */
9477 }
9479 /* Create and return a pointer to data member type. */
9481 tree
9483 {
9485 {
9490 }
9491 else
9492 {
9495 }
9496 }
9498 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
9499 Check to see that the definition is valid. Issue appropriate error
9500 messages. */
9502 static void
9504 {
9505 /* Avoid redundant diagnostics on out-of-class definitions. */
9507 ;
9508 /* Can't check yet if we don't know the type. */
9510 ;
9511 /* If DECL is declared constexpr, we'll do the appropriate checks
9512 in check_initializer. Similarly for inline static data members. */
9517 ;
9519 {
9522 "in-class initialization of static data member %q#D of "
9526 "%<constexpr%> needed for in-class initialization of "
9528 else
9530 "in-class initialization of static data member %q#D of "
9532 }
9533 /* Motion 10 at San Diego: If a static const integral data member is
9534 initialized with an integral constant expression, the initializer
9535 may appear either in the declaration (within the class), or in
9536 the definition, but not both. If it appears in the class, the
9537 member is a member constant. The file-scope definition is always
9538 required. */
9541 "invalid in-class initialization of static data member "
9543 type);
9546 "ISO C++ forbids in-class initialization of non-const "
9548 decl);
9551 "ISO C++ forbids initialization of member constant "
9553 }
9555 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
9556 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
9557 expressions out into temporary variables so that walk_tree doesn't
9558 step into them (c++/15764). */
9560 static tree
9562 {
9566 {
9572 }
9576 }
9578 /* Entry point for the above. */
9580 static void
9582 {
9584 /* Break out any function calls into temporary variables. */
9586 }
9588 /* Reduce a SIZEOF_EXPR to its value. */
9590 tree
9592 {
9593 tree r;
9600 else
9606 }
9608 /* Given the SIZE (i.e., number of elements) in an array, compute
9609 an appropriate index type for the array. If non-NULL, NAME is
9610 the name of the entity being declared. */
9612 tree
9614 {
9615 tree itype;
9622 {
9627 /* In C++98, we mark a non-constant array bound with a magic
9629 else
9630 {
9637 }
9642 /* The array bound must be an integer type. */
9645 {
9650 else
9653 }
9654 }
9656 /* A type is dependent if it is...an array type constructed from any
9657 dependent type or whose size is specified by a constant expression
9658 that is value-dependent. */
9659 /* We can only call value_dependent_expression_p on integral constant
9660 expressions; treat non-constant expressions as dependent, too. */
9664 {
9665 /* We cannot do any checking for a SIZE that isn't known to be
9666 constant. Just build the index type and mark that it requires
9667 structural equality checks. */
9674 }
9677 {
9682 /* Use the folded result for VLAs, too; it will have resolved
9683 SIZEOF_EXPR. */
9685 }
9687 /* Normally, the array-bound will be a constant. */
9689 {
9690 /* An array must have a positive number of elements. */
9692 {
9698 else
9701 }
9702 /* As an extension we allow zero-sized arrays. */
9704 {
9706 /* We must fail if performing argument deduction (as
9707 indicated by the state of complain), so that
9708 another substitution can be found. */
9714 else
9716 }
9717 }
9719 /* We don't allow VLAs at non-function scopes, or during
9720 tentative template substitution. */
9723 {
9726 /* `(int) &fn' is not a valid array bound. */
9729 name);
9730 else
9733 }
9735 {
9738 else
9740 }
9742 {
9746 else
9749 }
9752 /* A variable sized array. */
9754 else
9755 {
9756 /* Compute the index of the largest element in the array. It is
9757 one less than the number of elements in the array. We save
9758 and restore PROCESSING_TEMPLATE_DECL so that computations in
9759 cp_build_binary_op will be appropriately folded. */
9760 {
9761 processing_template_decl_sentinel s;
9763 MINUS_EXPR,
9766 complain),
9767 complain);
9769 }
9772 {
9773 /* A variable sized array. */
9780 {
9781 /* We have to add 1 -- in the ubsan routine we generate
9782 LE_EXPR rather than LT_EXPR. */
9787 }
9788 }
9789 /* Make sure that there was no overflow when creating to a signed
9790 index type. (For example, on a 32-bit machine, an array with
9791 size 2^32 - 1 is too big.) */
9794 {
9799 }
9800 }
9802 /* Create and return the appropriate index type. */
9805 /* If the index type were dependent, we would have returned early, so
9806 remember that it isn't. */
9810 }
9812 /* Returns the scope (if any) in which the entity declared by
9813 DECLARATOR will be located. If the entity was declared with an
9814 unqualified name, NULL_TREE is returned. */
9816 tree
9818 {
9822 /* If the declarator-id is a SCOPE_REF, the scope in which the
9823 declaration occurs is the first operand. */
9828 /* Otherwise, the declarator is not a qualified name; the entity will
9829 be declared in the current scope. */
9831 }
9833 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
9834 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
9835 with this type. */
9837 static tree
9839 {
9842 /* If things have already gone awry, bail now. */
9846 /* 8.3.4/1: If the type of the identifier of D contains the auto
9847 type-specifier, the program is ill-formed. */
9849 {
9852 else
9855 }
9857 /* If there are some types which cannot be array elements,
9858 issue an error-message and return. */
9860 {
9864 else
9871 else
9878 else
9885 else
9891 }
9893 /* [dcl.array]
9895 The constant expressions that specify the bounds of the arrays
9896 can be omitted only for the first member of the sequence. */
9898 {
9902 name);
9903 else
9908 }
9910 /* Figure out the index type for the array. */
9914 /* [dcl.array]
9915 T is called the array element type; this type shall not be [...] an
9916 abstract class type. */
9920 }
9922 /* Returns the smallest location that is not UNKNOWN_LOCATION. */
9924 static location_t
9926 {
9932 }
9934 /* Returns the smallest location != UNKNOWN_LOCATION among the
9935 three stored in LOCATIONS[ds_const], LOCATIONS[ds_volatile],
9936 and LOCATIONS[ds_restrict]. */
9938 static location_t
9940 {
9953 }
9955 /* Check that it's OK to declare a function with the indicated TYPE
9956 and TYPE_QUALS. SFK indicates the kind of special function (if any)
9957 that this function is. OPTYPE is the type given in a conversion
9958 operator declaration, or the class type for a constructor/destructor.
9959 Returns the actual return type of the function; that may be different
9960 than TYPE if an error occurs, or for certain special functions. */
9962 static tree
9964 tree type,
9965 tree optype,
9968 {
9970 {
9980 else
9991 /* We can't use the proper return type here because we run into
9992 problems with ambiguous bases and covariant returns. */
9995 else
10004 "qualifiers are not allowed on declaration of "
10015 "qualifiers are not allowed on declaration of "
10018 {
10022 }
10023 else
10033 }
10036 }
10038 /* A variable or data member (whose unqualified name is IDENTIFIER)
10039 has been declared with the indicated TYPE. If the TYPE is not
10040 acceptable, issue an error message and return a type to use for
10041 error-recovery purposes. */
10043 tree
10045 {
10047 {
10051 {
10054 }
10055 else
10058 }
10061 }
10063 /* Handle declaring DECL as an inline variable. */
10065 static void
10067 {
10070 {
10074 }
10079 {
10082 }
10083 }
10086 /* Assign a typedef-given name to a class or enumeration type declared
10087 as anonymous at first. This was split out of grokdeclarator
10088 because it is also used in libcc1. */
10090 void
10092 {
10095 /* Replace the anonymous name with the real name everywhere. */
10097 {
10099 /* We do not rename the debug info representing the
10100 unnamed tagged type because the standard says in
10101 [dcl.typedef] that the naming applies only for
10102 linkage purposes. */
10103 /*debug_hooks->set_name (t, decl);*/
10105 }
10110 /* If this is a typedef within a template class, the nested
10111 type is a (non-primary) template. The name for the
10112 template needs updating as well. */
10117 /* Adjust linkage now that we aren't unnamed anymore. */
10120 /* FIXME remangle member functions; member functions of a
10121 type with external linkage have external linkage. */
10123 /* Check that our job is done, and that it would fail if we
10124 attempted to do it again. */
10126 }
10128 /* Given declspecs and a declarator (abstract or otherwise), determine
10129 the name and type of the object declared and construct a DECL node
10130 for it.
10132 DECLSPECS points to the representation of declaration-specifier
10133 sequence that precedes declarator.
10135 DECL_CONTEXT says which syntactic context this declaration is in:
10136 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
10137 FUNCDEF for a function definition. Like NORMAL but a few different
10138 error messages in each case. Return value may be zero meaning
10139 this definition is too screwy to try to parse.
10140 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
10141 handle member functions (which have FIELD context).
10142 Return value may be zero meaning this definition is too screwy to
10143 try to parse.
10144 PARM for a parameter declaration (either within a function prototype
10145 or before a function body). Make a PARM_DECL, or return void_type_node.
10146 TPARM for a template parameter declaration.
10147 CATCHPARM for a parameter declaration before a catch clause.
10148 TYPENAME if for a typename (in a cast or sizeof).
10149 Don't make a DECL node; just return the ..._TYPE node.
10150 FIELD for a struct or union field; make a FIELD_DECL.
10151 BITFIELD for a field with specified width.
10153 INITIALIZED is as for start_decl.
10155 ATTRLIST is a pointer to the list of attributes, which may be NULL
10156 if there are none; *ATTRLIST may be modified if attributes from inside
10157 the declarator should be applied to the declaration.
10159 When this function is called, scoping variables (such as
10160 CURRENT_CLASS_TYPE) should reflect the scope in which the
10161 declaration occurs, not the scope in which the new declaration will
10162 be placed. For example, on:
10164 void S::f() { ... }
10166 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
10167 should not be `S'.
10169 Returns a DECL (if a declarator is present), a TYPE (if there is no
10170 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
10171 error occurs. */
10173 tree
10179 {
10191 /* True if this declarator is a function definition. */
10195 #if 0
10196 /* See the code below that used this. */
10198 #endif
10200 /* Keep track of what sort of function is being processed
10201 so that we can warn about default return values, or explicit
10202 return values which do not match prescribed defaults. */
10208 /* cv-qualifiers that apply to the declarator, for a declaration of
10209 a member function. */
10211 /* virt-specifiers that apply to the declarator, for a declaration of
10212 a member function. */
10214 /* ref-qualifier that applies to the declarator, for a declaration of
10215 a member function. */
10217 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
10224 /* The unqualified name of the declarator; either an
10225 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
10226 tree unqualified_id;
10227 /* The class type, if any, in which this entity is located,
10228 or NULL_TREE if none. Note that this value may be different from
10229 the current class type; for example if an attempt is made to declare
10230 "A::f" inside "B", this value will be "A". */
10232 /* The NAMESPACE_DECL for the namespace in which this entity is
10233 located. If an unqualified name is used to declare the entity,
10234 this value will be NULL_TREE, even if the entity is located at
10235 namespace scope. */
10237 cp_storage_class storage_class;
10258 // Was concept_p specified? Note that ds_concept
10259 // implies ds_constexpr!
10292 /* Look inside a declarator for the name being declared
10293 and get it as a string, for an error message. */
10295 id_declarator;
10297 {
10302 {
10306 {
10310 }
10314 {
10320 {
10325 {
10326 /* [dcl.meaning]
10328 A declarator-id shall not be qualified except
10329 for ...
10331 None of the cases are permitted in block
10332 scope. */
10335 decl);
10339 else
10343 }
10345 {
10348 {
10351 }
10353 && current_class_type
10355 current_class_type))
10356 {
10360 }
10361 }
10364 }
10366 {
10368 {
10370 {
10373 }
10376 {
10379 }
10386 }
10390 {
10396 }
10397 /* Fall through. */
10404 {
10406 dname);
10408 }
10411 else
10412 {
10419 else
10421 }
10426 }
10428 }
10445 }
10448 }
10450 /* [dcl.fct.edf]
10452 The declarator in a function-definition shall have the form
10453 D1 ( parameter-declaration-clause) ... */
10455 {
10458 }
10463 {
10466 }
10469 {
10472 {
10475 }
10478 {
10480 {
10483 }
10485 {
10488 }
10489 }
10490 }
10492 /* Anything declared one level down from the top level
10493 must be one of the parameters of a function
10494 (because the body is at least two levels down). */
10496 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
10497 by not allowing C++ class definitions to specify their parameters
10498 with xdecls (must be spec.d in the parmlist).
10500 Since we now wait to push a class scope until we are sure that
10501 we are in a legitimate method context, we must set oldcname
10502 explicitly (since current_class_name is not yet alive).
10504 We also want to avoid calling this a PARM if it is in a namespace. */
10507 {
10513 }
10519 {
10523 }
10526 {
10530 }
10532 /* If there were multiple types specified in the decl-specifier-seq,
10533 issue an error message. */
10535 {
10538 }
10541 {
10544 }
10546 /* Extract the basic type from the decl-specifier-seq. */
10549 {
10552 }
10555 {
10560 }
10561 /* No type at all: default to `int', and set DEFAULTED_INT
10562 because it was not a user-defined typedef. */
10564 {
10566 {
10567 /* These imply 'int'. */
10570 }
10571 /* If we just have "complex", it is equivalent to "complex double". */
10574 {
10577 "ISO C++ does not support plain %<complex%> meaning "
10579 }
10580 }
10581 /* Gather flags. */
10585 #if 0
10586 /* See the code below that used this. */
10589 #endif
10594 else
10598 {
10600 ctor_return_type,
10601 type_quals,
10604 }
10606 {
10611 /* We handle `main' specially here, because 'main () { }' is so
10612 common. With no options, it is allowed. With -Wreturn-type,
10613 it is a warning. It is only an error with -pedantic-errors. */
10614 is_main = (funcdef_flag
10630 else
10635 /* FIXME we should be able to propagate the error_mark_node as is
10636 for other contexts too. */
10638 else
10640 }
10645 {
10647 {
10651 }
10656 }
10658 /* Now process the modifiers that were specified
10659 and check for invalid combinations. */
10661 /* Long double is a special combination. */
10663 {
10667 }
10669 /* Check all other uses of type modifiers. */
10672 {
10673 location_t loc;
10676 {
10679 }
10681 {
10684 }
10686 {
10689 }
10691 {
10694 }
10696 {
10699 }
10704 {
10709 }
10711 {
10715 }
10723 {
10725 {
10729 }
10732 else
10734 }
10735 else
10738 /* Discard the type modifiers if they are invalid. */
10740 {
10746 }
10747 }
10749 /* Decide whether an integer type is signed or not.
10750 Optionally treat bitfields as signed by default. */
10752 /* [class.bit]
10754 It is implementation-defined whether a plain (neither
10755 explicitly signed or unsigned) char, short, int, or long
10756 bit-field is signed or unsigned.
10758 Naturally, we extend this to long long as well. Note that
10759 this does not include wchar_t. */
10761 && !signed_p
10762 /* A typedef for plain `int' without `signed' can be
10763 controlled just like plain `int', but a typedef for
10764 `signed int' cannot be so controlled. */
10765 && !(typedef_decl
10769 {
10782 else
10784 }
10797 {
10800 /* If a modifier is specified, the resulting complex is the complex
10801 form of TYPE. E.g, "complex short" is "complex short int". */
10810 else
10812 }
10814 /* If we're using the injected-class-name to form a compound type or a
10815 declaration, replace it with the underlying class so we don't get
10816 redundant typedefs in the debug output. But if we are returning the
10817 type unchanged, leave it alone so that it's available to
10818 maybe_get_template_decl_from_type_decl. */
10826 type = cp_build_qualified_type_real
10830 /* We might have ignored or rejected some of the qualifiers. */
10837 {
10841 }
10853 {
10855 {
10862 }
10864 {
10868 "%<virtual%> and %<constexpr%> only in -std=c++2a or "
10870 }
10871 }
10874 /* Issue errors about use of storage classes for parameters. */
10876 {
10878 {
10882 }
10884 {
10888 name);
10890 }
10894 {
10899 }
10901 /* Function parameters cannot be concept. */
10905 /* Function parameters cannot be constexpr. If we saw one, moan
10906 and pretend it wasn't there. */
10908 {
10912 }
10913 }
10915 /* Give error if `virtual' is used outside of class declaration. */
10918 {
10922 }
10925 {
10940 declspecs->gnu_thread_keyword_p
10946 {
10971 }
10974 {
10976 {
10980 "type must be cv-qualified %<auto%> or reference to "
10982 }
10985 }
10995 }
10997 /* Static anonymous unions are dealt with here. */
11003 /* Warn about storage classes that are invalid for certain
11004 kinds of declarations (parameters, typenames, etc.). */
11006 && ((storage_class
11010 {
11013 }
11018 {
11022 ;
11024 ;
11026 /* C++ allows static class elements. */
11028 /* C++ also allows inlines and signed and unsigned elements,
11029 but in those cases we don't come in here. */
11030 ;
11031 else
11032 {
11033 location_t loc
11040 else
11047 }
11048 }
11053 {
11056 }
11060 {
11066 /* When thread_local is applied to a variable of block scope the
11067 storage-class-specifier static is implied if it does not appear
11068 explicitly. */
11071 }
11074 {
11077 "storage class specifiers invalid in friend function "
11081 }
11085 else
11086 {
11089 {
11102 }
11103 }
11106 {
11111 }
11113 /* Determine the type of the entity declared by recurring on the
11114 declarator. */
11116 {
11118 tree attrs;
11125 {
11137 attr_flags);
11138 }
11142 /* We don't want to warn in parameter context because we don't
11143 yet know if the parse will succeed, and this might turn out
11144 to be a constructor call. */
11147 && !typedef_p
11149 /* If the type is class-like and the inner name used a
11150 global namespace qualifier, we need the parens.
11151 Unfortunately all we can tell is whether a qualified name
11152 was used or not. */
11153 && !(inner_declarator
11164 {
11172 /* [dcl.array]/1:
11174 The optional attribute-specifier-seq appertains to the
11175 array. */
11181 {
11182 tree arg_types;
11185 /* Declaring a function type. */
11191 /* Pick up type qualifiers which should be applied to `this'. */
11193 /* Pick up virt-specifiers. */
11195 /* And ref-qualifier, too */
11197 /* And tx-qualifier. */
11199 /* Pick up the exception specifications. */
11201 /* If the exception-specification is ill-formed, let's pretend
11202 there wasn't one. */
11210 /* Say it's a definition only for the CALL_EXPR
11211 closest to the identifier. */
11214 /* Handle a late-specified return type. */
11217 /* This is the case e.g. for
11218 using T = auto () -> int. */
11220 {
11222 {
11224 {
11229 {
11231 "%<auto%> type specifier without trailing "
11234 "only available with -std=c++14 or "
11236 }
11238 {
11242 }
11243 }
11245 {
11250 }
11252 {
11255 "%<decltype(auto)%> as its type rather than "
11257 else
11260 }
11266 {
11268 {
11275 }
11277 {
11279 "for %qT must have trailing return "
11284 }
11290 else
11294 }
11295 }
11298 {
11300 /* Not using maybe_warn_cpp0x because this should
11301 always be an error. */
11304 else
11308 }
11309 }
11315 {
11318 }
11321 {
11325 /* We now know that the TYPE_QUALS don't apply to the
11326 decl, but to its return type. */
11328 }
11330 /* Error about some types functions can't return. */
11333 {
11337 }
11339 {
11343 }
11347 && funcdecl_p
11353 {
11354 /* We are within a class's scope. If our declarator name
11355 is the same as the class name, and we are defining
11356 a function, then it is a constructor/destructor, and
11357 therefore returns a void type. */
11359 /* ISO C++ 12.4/2. A destructor may not be declared
11360 const or volatile. A destructor may not be static.
11361 A destructor may not be declared with ref-qualifier.
11363 ISO C++ 12.1. A constructor may not be declared
11364 const or volatile. A constructor may not be
11365 virtual. A constructor may not be static.
11366 A constructor may not be declared with ref-qualifier. */
11372 {
11377 }
11380 {
11386 }
11390 current_class_type,
11391 flags))
11395 {
11396 /* It's a constructor. */
11400 {
11404 }
11408 }
11411 }
11413 {
11415 {
11416 /* Cannot be both friend and virtual. */
11421 }
11425 {
11429 }
11430 }
11432 {
11434 {
11437 }
11440 }
11442 {
11445 }
11452 pushed_scope
11464 {
11468 }
11474 {
11476 /* transaction_safe applies to the type, but
11477 transaction_safe_dynamic applies to the function. */
11480 else
11482 }
11484 /* [dcl.fct]/2:
11486 The optional attribute-specifier-seq appertains to
11487 the function type. */
11492 }
11498 /* Filter out pointers-to-references and references-to-references.
11499 We can get these if a TYPE_DECL is used. */
11502 {
11504 {
11507 }
11509 /* In C++0x, we allow reference to reference declarations
11510 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
11511 and template type arguments [14.3.1/4 temp.arg.type]. The
11512 check for direct reference to reference declarations, which
11513 are still forbidden, occurs below. Reasoning behind the change
11514 can be found in DR106, DR540, and the rvalue reference
11515 proposals. */
11517 {
11520 }
11521 }
11523 {
11528 }
11530 /* We now know that the TYPE_QUALS don't apply to the decl,
11531 but to the target of the pointer. */
11534 /* This code used to handle METHOD_TYPE, but I don't think it's
11535 possible to get it here anymore. */
11539 {
11543 memfn_quals,
11544 rqual);
11550 }
11558 type);
11560 /* When the pointed-to type involves components of variable size,
11561 care must be taken to ensure that the size evaluation code is
11562 emitted early enough to dominate all the possible later uses
11563 and late enough for the variables on which it depends to have
11564 been assigned.
11566 This is expected to happen automatically when the pointed-to
11567 type has a name/declaration of it's own, but special attention
11568 is required if the type is anonymous.
11570 We handle the NORMAL and FIELD contexts here by inserting a
11571 dummy statement that just evaluates the size at a safe point
11572 and ensures it is not deferred until e.g. within a deeper
11573 conditional context (c++/43555).
11575 We expect nothing to be needed here for PARM or TYPENAME.
11576 Evaluating the size at this point for TYPENAME would
11577 actually be incorrect, as we might be in the middle of an
11578 expression with side effects on the pointed-to type size
11579 "arguments" prior to the pointer declaration point and the
11580 size evaluation could end up prior to the side effects. */
11586 {
11590 }
11593 {
11594 /* In C++0x, the type we are creating a reference to might be
11595 a typedef which is itself a reference type. In that case,
11596 we follow the reference collapsing rules in
11597 [7.1.3/8 dcl.typedef] to create the final reference type:
11599 "If a typedef TD names a type that is a reference to a type
11600 T, an attempt to create the type 'lvalue reference to cv TD'
11601 creates the type 'lvalue reference to T,' while an attempt
11602 to create the type "rvalue reference to cv TD' creates the
11603 type TD."
11604 */
11608 {
11611 else
11613 }
11614 else
11615 type = cp_build_reference_type
11618 /* In C++0x, we need this check for direct reference to
11619 reference declarations, which are forbidden by
11620 [8.3.2/5 dcl.ref]. Reference to reference declarations
11621 are only allowed indirectly through typedefs and template
11622 type arguments. Example:
11624 void foo(int & &); // invalid ref-to-ref decl
11626 typedef int & int_ref;
11627 void foo(int_ref &); // valid ref-to-ref decl
11628 */
11632 }
11636 {
11640 /* We will already have complained. */
11642 else
11644 type);
11645 }
11646 else
11649 /* Process a list of type modifier keywords (such as
11650 const or volatile) that were given inside the `*' or `&'. */
11653 {
11654 type
11658 }
11660 /* Apply C++11 attributes to the pointer, and not to the
11661 type pointed to. This is unlike what is done for GNU
11662 attributes above. It is to comply with [dcl.ptr]/1:
11664 [the optional attribute-specifier-seq (7.6.1) appertains
11665 to the pointer and not to the object pointed to]. */
11678 }
11679 }
11681 /* A `constexpr' specifier used in an object declaration declares
11682 the object as `const'. */
11684 {
11685 /* DR1688 says that a `constexpr' specifier in combination with
11686 `volatile' is valid. */
11689 {
11692 }
11693 }
11699 {
11701 unqualified_id);
11703 }
11705 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
11706 qualified with a class-name, turn it into a METHOD_TYPE, unless
11707 we know that the function is static. We take advantage of this
11708 opportunity to do other processing that pertains to entities
11709 explicitly declared to be class members. Note that if DECLARATOR
11710 is non-NULL, we know it is a cdk_id declarator; otherwise, we
11711 would not have exited the loop above. */
11716 {
11722 {
11724 {
11728 }
11729 else
11733 }
11735 can skip the following checks. */
11738 qualifying type must certainly be complete. */
11739 funcdef_flag
11740 /* A friend declaration of "T::f" is OK, even if
11741 "T" is a template parameter. But, if this
11742 function is not a friend, the qualifying type
11743 must be a class. */
11745 /* For a declaration, the type need not be
11746 complete, if either it is dependent (since there
11747 is no meaningful definition of complete in that
11748 case) or the qualifying class is currently being
11749 defined. */
11752 /* Check that the qualifying type is complete. */
11756 {
11759 {
11767 }
11768 }
11770 {
11774 }
11775 }
11780 /* Now TYPE has the actual type. */
11783 {
11786 else
11788 }
11794 {
11795 /* [dcl.meaning]/1: The optional attribute-specifier-seq following
11796 a declarator-id appertains to the entity that is declared. */
11799 else
11800 /* We should have already diagnosed the issue (c++/78344). */
11802 }
11804 /* Handle parameter packs. */
11806 {
11808 /* Turn the type into a pack expansion.*/
11810 else
11812 }
11815 && !processing_template_decl
11817 {
11820 else
11823 }
11826 {
11827 /* [dcl.fct.spec] (C++11) The explicit specifier shall be used only
11828 in the declaration of a constructor or conversion function within
11829 a class definition. */
11836 else
11838 "only declarations of constructors and conversion operators "
11841 }
11844 {
11846 {
11849 }
11851 {
11854 }
11857 {
11860 }
11862 {
11865 }
11867 {
11870 }
11872 {
11876 }
11877 }
11879 /* If this is declaring a typedef name, return a TYPE_DECL. */
11881 {
11883 tree decl;
11885 /* This declaration:
11887 typedef void f(int) const;
11889 declares a function type which is not a member of any
11890 particular class, but which is cv-qualified; for
11891 example "f S::*" declares a pointer to a const-qualified
11892 member function of S. We record the cv-qualification in the
11893 function type. */
11895 {
11898 /* We have now dealt with these qualifiers. */
11901 }
11904 {
11908 else
11912 }
11918 {
11921 }
11925 else
11929 {
11933 /* The TYPE_DECL is "abstract" because there will be
11934 clones of this constructor/destructor, and there will
11935 be copies of this TYPE_DECL generated in those
11936 clones. The decloning optimization (for space) may
11937 revert this subsequently if it determines that
11938 the clones should share a common implementation. */
11940 }
11945 unqualified_id);
11947 /* If the user declares "typedef struct {...} foo" then the
11948 struct will have an anonymous name. Fill that name in now.
11949 Nothing can refer to it, so nothing needs know about the name
11950 change. */
11952 && unqualified_id
11971 /* Acknowledge that this was written:
11972 `using analias = atype;'. */
11976 }
11978 /* Detect the case of an array type of unspecified size
11979 which came, as such, direct from a typedef name.
11980 We must copy the type, so that the array's domain can be
11981 individually set by the object's initializer. */
11988 /* Detect where we're using a typedef of function type to declare a
11989 function. PARMS will not be set, so we must create it now. */
11992 {
11994 tree args;
11999 {
12005 }
12010 {
12011 /* The qualifiers on the function type become the qualifiers on
12012 the non-static member function. */
12016 }
12017 }
12019 /* If this is a type name (such as, in a cast or sizeof),
12020 compute the type and return it now. */
12023 {
12024 /* Note that here we don't care about type_quals. */
12026 /* Special case: "friend class foo" looks like a TYPENAME context. */
12028 {
12030 {
12033 }
12036 {
12037 /* Don't allow friend declaration without a class-key. */
12044 else
12047 type);
12048 }
12050 /* Only try to do this stuff if we didn't already give up. */
12052 {
12053 /* A friendly class? */
12057 else
12059 type);
12062 }
12063 }
12065 {
12072 /* Core issue #547: need to allow this in template type args.
12073 Allow it in general in C++11 for alias-declarations. */
12077 else
12079 }
12085 }
12089 && ! bitfield
12091 {
12094 }
12097 {
12098 /* Only functions may be declared using an operator-function-id. */
12100 {
12103 }
12108 type);
12109 }
12111 /* We don't check parameter types here because we can emit a better
12112 error message later. */
12114 {
12118 }
12120 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
12121 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
12124 {
12130 {
12133 else
12136 }
12138 /* A parameter declared as an array of T is really a pointer to T.
12139 One declared as a function is really a pointer to a function.
12140 One declared as a member is really a pointer to member. */
12143 {
12144 /* Transfer const-ness of array into that of type pointed to. */
12148 }
12151 }
12156 {
12162 }
12164 {
12168 {
12176 }
12178 {
12181 {
12187 else
12191 }
12193 /* The C99 flexible array extension. */
12196 {
12200 {
12203 }
12204 else
12205 {
12206 /* Array is a flexible member. */
12208 /* Do not warn on flexible array members in system
12213 else
12217 /* Flexible array member has a null domain. */
12219 }
12220 }
12223 {
12224 /* Happens when declaring arrays of sizes which
12225 are error_mark_node, for example. */
12227 }
12229 {
12230 /* Something like struct S { int N::j; }; */
12233 }
12236 {
12238 tree function_context;
12241 {
12242 /* This should never happen in pure C++ (the check
12243 could be an assert). It could happen in
12244 Objective-C++ if someone writes invalid code that
12245 uses a function declaration for an instance
12246 variable or property (instance variables and
12247 properties are parsed as FIELD_DECLs, but they are
12248 part of an Objective-C class, not a C++ class).
12249 That code is invalid and is caught by this
12250 check. */
12252 {
12254 unqualified_id);
12256 }
12258 /* ``A union may [ ... ] not [ have ] virtual functions.''
12259 ARM 9.5 */
12261 {
12264 unqualified_id);
12266 }
12271 {
12273 "%qD cannot be declared %<virtual%>, since it "
12276 }
12277 }
12279 /* Check that the name used for a destructor makes sense. */
12281 {
12285 {
12290 }
12293 {
12297 }
12299 {
12303 }
12305 {
12309 }
12310 }
12312 {
12317 }
12320 {
12324 }
12326 {
12330 }
12333 {
12336 {
12342 }
12343 }
12345 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
12354 parms,
12355 unqualified_id,
12356 declspecs,
12357 reqs,
12368 #if 0
12369 /* This clobbers the attrs stored in `decl' from `attrlist'. */
12370 /* The decl and setting of decl_attr is also turned off. */
12372 #endif
12374 /* [class.conv.ctor]
12376 A constructor declared without the function-specifier
12377 explicit that can be called with a single parameter
12378 specifies a conversion from the type of its first
12379 parameter to the type of its class. Such a constructor
12380 is called a converting constructor. */
12383 }
12388 {
12391 {
12393 {
12397 }
12398 else
12403 }
12404 }
12405 else
12406 {
12408 {
12412 }
12414 }
12417 {
12418 /* Friends are treated specially. */
12422 {
12424 {
12425 decl = check_explicit_specialization
12430 }
12434 funcdef_flag);
12436 }
12437 else
12439 }
12441 /* Structure field. It may not be a function, except for C++. */
12444 {
12446 {
12447 /* C++ allows static class members. All other work
12448 for this is done by grokfield. */
12457 unqualified_id);
12459 {
12463 }
12470 /* Even if there is an in-class initialization, DECL
12471 is considered undefined until an out-of-class
12472 definition is provided, unless this is an inline
12473 variable. */
12477 {
12483 }
12484 }
12485 else
12486 {
12490 unqualified_id);
12492 {
12495 unqualified_id);
12497 }
12502 {
12505 }
12508 {
12511 }
12514 {
12515 /* An attempt is being made to initialize a non-static
12516 member. This is new in C++11. */
12519 /* If this has been parsed with static storage class, but
12520 errors forced staticp to be cleared, ensure NSDMI is
12521 not present. */
12524 }
12525 }
12532 }
12533 }
12536 {
12537 tree original_name;
12545 else
12547 // FIXME:gcc_assert (original_name == dname);
12554 {
12558 name);
12559 else
12561 "storage class %<thread_local%> invalid for "
12563 }
12568 /* Function declaration not at top level.
12569 Storage classes other than `extern' are not allowed
12570 and `extern' makes no difference. */
12575 {
12578 "%<static%> specifier invalid for function %qs "
12580 else
12582 "%<inline%> specifier invalid for function %qs "
12584 }
12587 {
12589 {
12592 }
12595 {
12600 }
12601 }
12603 /* Record whether the function is public. */
12608 declspecs,
12611 publicp,
12614 sfk,
12615 funcdef_flag,
12616 late_return_type_p,
12625 {
12628 /* Don't allow a static member function in a class, and forbid
12629 declaring main to be static. */
12631 {
12635 }
12637 {
12638 /* 7.1.1: There can be no static function declarations within a
12639 block. */
12643 }
12646 {
12649 }
12650 }
12651 }
12652 else
12653 {
12654 /* It's a variable. */
12656 /* An uninitialized decl with `extern' is a reference. */
12658 declspecs,
12659 initialized,
12660 type_quals,
12661 inlinep,
12662 concept_p,
12663 template_count,
12674 {
12677 {
12682 }
12684 {
12687 }
12689 {
12691 "cannot explicitly declare member %q#D to have "
12694 }
12695 }
12697 {
12701 }
12706 {
12711 }
12712 }
12717 {
12721 }
12724 {
12726 {
12727 /* It's common practice (and completely valid) to have a const
12728 be initialized and declared extern. */
12731 }
12732 else
12733 {
12736 }
12737 }
12739 /* Record `register' declaration for warnings on &
12740 and in case doing stupid register allocation. */
12743 {
12745 /* Warn about register storage specifiers on PARM_DECLs. */
12747 {
12750 "ISO C++17 does not allow %<register%> storage "
12752 else
12755 }
12756 }
12762 /* Set constexpr flag on vars (functions got it in grokfndecl). */
12766 /* Record constancy and volatility on the DECL itself . There's
12767 no need to do this when processing a template; we'll do this
12768 for the instantiated declaration based on the type of DECL. */
12773 }
12774 }
12775 \f
12776 /* Subroutine of start_function. Ensure that each of the parameter
12777 types (as listed in PARMS) is complete, as is required for a
12778 function definition. */
12780 static void
12782 {
12784 {
12789 {
12795 }
12796 else
12797 /* grokparms or complete_type_or_else will have already issued
12798 an error. */
12800 }
12801 }
12803 /* Returns nonzero if T is a local variable. */
12805 int
12807 {
12809 /* A VAR_DECL with a context that is a _TYPE is a static data
12810 member. */
12812 /* Any other non-local variable must be at namespace scope. */
12818 }
12820 /* Like local_variable_p, but suitable for use as a tree-walking
12821 function. */
12823 static tree
12826 {
12834 }
12836 /* Check that ARG, which is a default-argument expression for a
12837 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
12838 something goes wrong. DECL may also be a _TYPE node, rather than a
12839 DECL, if there is no DECL available. */
12841 tree
12843 {
12844 tree var;
12845 tree decl_type;
12848 /* We get a DEFAULT_ARG when looking at an in-class declaration
12849 with a default argument. Ignore the argument for now; we'll
12850 deal with it after the class is complete. */
12854 {
12857 }
12858 else
12865 /* Something already went wrong. There's no need to check
12866 further. */
12869 /* [dcl.fct.default]
12871 A default argument expression is implicitly converted to the
12872 parameter type. */
12874 /* Avoid digest_init clobbering the initializer. */
12877 LOOKUP_IMPLICIT);
12880 /* Avoid redundant -Wzero-as-null-pointer-constant warnings at
12881 the call sites. */
12886 /* [dcl.fct.default]
12888 Local variables shall not be used in default argument
12889 expressions.
12891 The keyword `this' shall not be used in a default argument of a
12892 member function. */
12895 {
12897 {
12901 else
12903 }
12905 }
12907 /* All is well. */
12909 }
12911 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
12913 static tree
12915 {
12920 {
12923 else
12925 }
12927 /* Do warn about using typedefs to a deprecated class. */
12939 return type_is_deprecated
12943 }
12945 /* Decode the list of parameter types for a function type.
12946 Given the list of things declared inside the parens,
12947 return a list of types.
12949 If this parameter does not end with an ellipsis, we append
12950 void_list_node.
12952 *PARMS is set to the chain of PARM_DECLs created. */
12954 tree
12956 {
12959 tree parm;
12963 {
12976 {
12978 && !init
12981 /* DR 577: A parameter list consisting of a single
12982 unnamed parameter of non-dependent type 'void'. */
12986 "invalid use of cv-qualified type %qT in "
12988 else
12990 "invalid use of type %<void%> in parameter "
12992 /* It's not a good idea to actually create parameters of
12993 type `void'; other parts of the compiler assume that a
12994 void type terminates the parameter list. */
12997 }
13000 {
13002 {
13006 }
13008 /* Top-level qualifiers on the parameters are
13009 ignored for function types. */
13012 {
13016 }
13020 {
13021 /* Before C++17 DR 393:
13022 [dcl.fct]/6, parameter types cannot contain pointers
13023 (references) to arrays of unknown bound. */
13028 {
13036 }
13039 ptr
13045 }
13051 }
13056 }
13064 }
13066 \f
13067 /* D is a constructor or overloaded `operator='.
13069 Let T be the class in which D is declared. Then, this function
13070 returns:
13072 -1 if D's is an ill-formed constructor or copy assignment operator
13073 whose first parameter is of type `T'.
13074 0 if D is not a copy constructor or copy assignment
13075 operator.
13076 1 if D is a copy constructor or copy assignment operator whose
13077 first parameter is a reference to non-const qualified T.
13078 2 if D is a copy constructor or copy assignment operator whose
13079 first parameter is a reference to const qualified T.
13081 This function can be used as a predicate. Positive values indicate
13082 a copy constructor and nonzero values indicate a copy assignment
13083 operator. */
13085 int
13087 {
13088 tree args;
13089 tree arg_type;
13097 /* Instantiations of template member functions are never copy
13098 functions. Note that member functions of templated classes are
13099 represented as template functions internally, and we must
13100 accept those as copy functions. */
13112 {
13113 /* Pass by value copy assignment operator. */
13115 }
13119 {
13122 }
13123 else
13129 /* There are more non-optional args. */
13133 }
13135 /* D is a constructor or overloaded `operator='.
13137 Let T be the class in which D is declared. Then, this function
13138 returns true when D is a move constructor or move assignment
13139 operator, false otherwise. */
13141 bool
13143 {
13147 /* There are no move constructors if we are in C++98 mode. */
13153 /* Instantiations of template member functions are never move
13154 functions. Note that member functions of templated classes are
13155 represented as template functions internally, and we must
13156 accept those as move functions. */
13160 }
13162 /* D is a constructor or overloaded `operator='.
13164 Then, this function returns true when D has the same signature as a move
13165 constructor or move assignment operator (because either it is such a
13166 ctor/op= or it is a template specialization with the same signature),
13167 false otherwise. */
13169 bool
13171 {
13172 tree args;
13173 tree arg_type;
13193 /* There are more non-optional args. */
13197 }
13199 /* Remember any special properties of member function DECL. */
13201 void
13203 {
13204 tree class_type;
13211 {
13218 {
13219 /* [class.copy]
13221 A non-template constructor for class X is a copy
13222 constructor if its first parameter is of type X&, const
13223 X&, volatile X& or const volatile X&, and either there
13224 are no other parameters or else all other parameters have
13225 default arguments. */
13231 }
13242 }
13244 {
13245 /* [class.copy]
13247 A non-template assignment operator for class X is a copy
13248 assignment operator if its parameter is of type X, X&, const
13249 X&, volatile X& or const volatile X&. */
13254 {
13260 }
13263 }
13267 /* Destructors are handled in check_methods. */
13268 }
13270 /* Check a constructor DECL has the correct form. Complains
13271 if the class has a constructor of the form X(X). */
13273 bool
13275 {
13279 {
13280 /* [class.copy]
13282 A declaration of a constructor for a class X is ill-formed if
13283 its first parameter is of type (optionally cv-qualified) X
13284 and either there are no other parameters or else all other
13285 parameters have default arguments.
13287 We *don't* complain about member template instantiations that
13288 have this form, though; they can occur as we try to decide
13289 what constructor to use during overload resolution. Since
13290 overload resolution will never prefer such a constructor to
13291 the non-template copy constructor (which is either explicitly
13292 or implicitly defined), there's no need to worry about their
13293 existence. Theoretically, they should never even be
13294 instantiated, but that's hard to forestall. */
13298 }
13301 }
13303 /* DECL is a declaration for an overloaded or conversion operator. If
13304 COMPLAIN is true, errors are issued for invalid declarations. */
13306 bool
13308 {
13318 tree_code operator_code;
13321 {
13322 /* Conversion operators are TYPE_EXPR for the purposes of this
13323 function. */
13326 }
13327 else
13328 {
13335 }
13338 {
13339 /* operator new and operator delete are quite special. */
13342 {
13361 }
13363 /* [basic.std.dynamic.allocation]/1:
13365 A program is ill-formed if an allocation function is declared
13366 in a namespace scope other than global scope or declared
13367 static in global scope.
13369 The same also holds true for deallocation functions. */
13371 {
13373 {
13375 decl);
13377 }
13380 {
13383 }
13384 }
13388 else
13389 {
13392 }
13395 }
13397 /* An operator function must either be a non-static member function
13398 or have at least one parameter of a class, a reference to a class,
13399 an enumeration, or a reference to an enumeration. 13.4.0.6 */
13401 {
13407 {
13410 }
13413 {
13417 }
13420 {
13422 {
13427 }
13433 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
13434 because these checks are performed even on template
13435 functions. */
13439 }
13440 }
13443 /* There are no further restrictions on the arguments to an overloaded
13444 "operator ()". */
13448 {
13449 /* 13.4.0.3 */
13452 }
13454 /* Count the number of arguments and check for ellipsis. */
13457 {
13459 {
13460 /* Variadic. */
13462 decl);
13464 }
13466 }
13468 /* Verify correct number of arguments. */
13470 {
13473 {
13474 /* We have a unary instance of an ambi-ary op. Remap to the
13475 unary one. */
13481 }
13483 {
13484 /* This was an ambiguous operator but is invalid. */
13486 methodp
13490 }
13493 && ! processing_template_decl
13494 /* x++ and x--'s second argument must be an int. */
13496 integer_type_node))
13497 {
13499 methodp
13502 decl);
13504 }
13509 {
13511 methodp
13515 }
13520 {
13522 methodp
13526 }
13531 }
13533 /* There can be no default arguments. */
13536 {
13540 }
13542 /* At this point the declaration is well-formed. It may not be
13543 sensible though. */
13545 /* Check member function warnings only on the in-class declaration.
13546 There's no point warning on an out-of-class definition. */
13550 /* Warn about conversion operators that will never be used. */
13554 {
13565 {
13568 ref
13573 class_type);
13574 /* Don't force t to be complete here. */
13579 ref
13585 }
13586 }
13591 /* Effective C++ rules below. */
13593 /* More Effective C++ rule 7. */
13600 /* More Effective C++ rule 6. */
13605 {
13614 {
13619 }
13620 else
13621 {
13625 }
13626 }
13628 /* Effective C++ rule 23. */
13639 }
13640 \f
13641 /* Return a string giving the keyword associate with CODE. */
13645 {
13647 {
13660 }
13661 }
13663 /* Name lookup in an elaborated-type-specifier (after the keyword
13664 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
13665 elaborated-type-specifier is invalid, issue a diagnostic and return
13666 error_mark_node; otherwise, return the *_TYPE to which it referred.
13667 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
13669 tree
13671 tree decl,
13673 {
13674 tree type;
13676 /* In the case of:
13678 struct S { struct S *p; };
13680 name lookup will find the TYPE_DECL for the implicit "S::S"
13681 typedef. Adjust for that here. */
13687 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
13688 is false for this case as well. */
13690 {
13694 }
13695 /* Accept template template parameters. */
13699 ;
13700 /* [dcl.type.elab]
13702 If the identifier resolves to a typedef-name or the
13703 simple-template-id resolves to an alias template
13704 specialization, the elaborated-type-specifier is ill-formed.
13706 In other words, the only legitimate declaration to use in the
13707 elaborated type specifier is the implicit typedef created when
13708 the type is declared. */
13712 {
13716 else
13721 }
13726 {
13730 }
13733 {
13737 }
13741 {
13742 /* If a class template appears as elaborated type specifier
13743 without a template header such as:
13745 template <class T> class C {};
13746 void f(class C); // No template header here
13748 then the required template argument is missing. */
13753 }
13756 }
13758 /* Lookup NAME in elaborate type specifier in scope according to
13759 SCOPE and issue diagnostics if necessary.
13760 Return *_TYPE node upon success, NULL_TREE when the NAME is not
13761 found, and ERROR_MARK_NODE for type error. */
13763 static tree
13766 {
13767 tree t;
13768 tree decl;
13770 {
13771 /* First try ordinary name lookup, ignoring hidden class name
13772 injected via friend declaration. */
13775 /* If that fails, the name will be placed in the smallest
13776 non-class, non-function-prototype scope according to 3.3.1/5.
13777 We may already have a hidden name declared as friend in this
13778 scope. So lookup again but not ignoring hidden names.
13779 If we find one, that name will be made visible rather than
13780 creating a new tag. */
13783 }
13784 else
13789 /* If scope is ts_current we're defining a class, so ignore a
13790 template template parameter. */
13796 {
13797 /* Look for invalid nested type:
13798 class C {
13799 class C {};
13800 }; */
13802 {
13805 decl);
13807 }
13809 /* Two cases we need to consider when deciding if a class
13810 template is allowed as an elaborated type specifier:
13811 1. It is a self reference to its own class.
13812 2. It comes with a template header.
13814 For example:
13816 template <class T> class C {
13817 class C *c1; // DECL_SELF_REFERENCE_P is true
13818 class D;
13819 };
13820 template <class U> class C; // template_header_p is true
13821 template <class T> class C<T>::D {
13822 class C *c2; // DECL_SELF_REFERENCE_P is true
13823 }; */
13826 decl,
13827 template_header_p
13832 {
13841 }
13844 }
13846 {
13850 }
13851 else
13853 }
13855 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
13856 Define the tag as a forward-reference if it is not defined.
13858 If a declaration is given, process it here, and report an error if
13859 multiple declarations are not identical.
13861 SCOPE is TS_CURRENT when this is also a definition. Only look in
13862 the current frame for the name (since C++ allows new names in any
13863 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
13864 declaration. Only look beginning from the current scope outward up
13865 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
13867 TEMPLATE_HEADER_P is true when this declaration is preceded by
13868 a set of template parameters. */
13870 static tree
13873 {
13880 {
13893 }
13895 /* In case of anonymous name, xref_tag is only called to
13896 make type node and push name. Name lookup is not required. */
13907 {
13911 /* Since SCOPE is not TS_CURRENT, we are not looking at a
13912 definition of this tag. Since, in addition, we are currently
13913 processing a (member) template declaration of a template
13914 class, we must be very careful; consider:
13916 template <class X> struct S1
13918 template <class U> struct S2
13919 {
13920 template <class V> friend struct S1;
13921 };
13923 Here, the S2::S1 declaration should not be confused with the
13924 outer declaration. In particular, the inner version should
13925 have a template parameter of level 2, not level 1.
13927 On the other hand, when presented with:
13929 template <class T> struct S1
13930 {
13931 template <class U> struct S2 {};
13932 template <class U> friend struct S2;
13933 };
13935 the friend must find S1::S2 eventually. We accomplish this
13936 by making sure that the new type we create to represent this
13937 declaration has the right TYPE_CONTEXT. */
13940 }
13943 {
13944 /* If no such tag is yet defined, create a forward-reference node
13945 and record it as the "definition".
13946 When a real declaration of this type is found,
13947 the forward-reference will be altered into a real type. */
13949 {
13952 }
13953 else
13954 {
13958 {
13959 /* Mark it as a lambda type. */
13961 /* And push it into current scope. */
13963 }
13965 }
13966 }
13967 else
13968 {
13970 {
13971 /* Check that we aren't trying to overload a class with different
13972 constraints. */
13975 {
13978 }
13981 }
13985 {
13989 }
13992 {
13993 /* This is no longer an invisible friend. Make it
13994 visible. */
14001 {
14005 }
14006 }
14007 }
14010 }
14012 /* Wrapper for xref_tag_1. */
14014 tree
14017 {
14018 tree ret;
14024 }
14027 tree
14029 {
14034 else
14041 }
14043 /* Create the binfo hierarchy for REF with (possibly NULL) base list
14044 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
14045 access_* node, and the TREE_VALUE is the type of the base-class.
14046 Non-NULL TREE_TYPE indicates virtual inheritance. */
14048 void
14050 {
14057 tree default_access;
14063 /* The base of a derived class is private by default, all others are
14064 public. */
14069 /* First, make sure that any templates in base-classes are
14070 instantiated. This ensures that if we call ourselves recursively
14071 we do not get confused about which classes are marked and which
14072 are not. */
14075 {
14078 /* The dependent_type_p call below should really be dependent_scope_p
14079 so that we give a hard error about using an incomplete type as a
14080 base, but we allow it with a pedwarn for backward
14081 compatibility. */
14087 /* An incomplete type. Remove it from the list. */
14089 else
14090 {
14091 max_bases++;
14093 max_dvbases++;
14097 }
14098 }
14103 /* The binfo slot should be empty, unless this is an (ill-formed)
14104 redefinition. */
14115 /* Apply base-class info set up to the variants of this type. */
14119 {
14121 /* A C++98 POD cannot have base classes. */
14125 {
14128 }
14129 }
14136 {
14137 /* An aggregate can't have virtual base classes. */
14145 }
14148 {
14156 /* Before C++17, an aggregate cannot have base classes. In C++17, an
14157 aggregate can't have virtual, private, or protected base classes. */
14168 {
14170 basetype);
14172 }
14176 {
14178 /* The original basetype could have been a typedef'd type. */
14181 /* Inherit flags from the base. */
14192 }
14194 /* We must do this test after we've seen through a typedef
14195 type. */
14197 {
14200 else
14203 }
14206 /* Regenerate the pack expansion for the bases. */
14220 dropped_base:
14221 /* Update max_vbases to reflect the reality that we are dropping
14222 this base: if it reaches zero we want to undo the vec_alloc
14223 above to avoid inconsistencies during error-recovery: eg, in
14224 build_special_member_call, CLASSTYPE_VBASECLASSES non null
14225 and vtt null (c++/27952). */
14227 max_vbases--;
14229 max_vbases
14231 }
14238 /* If we didn't get max_vbases vbases, we must have shared at
14239 least one of them, and are therefore diamond shaped. */
14242 /* Unmark all the types. */
14247 /* Now see if we have a repeated base type. */
14249 {
14252 {
14254 {
14257 }
14259 }
14264 else
14266 }
14267 }
14269 \f
14270 /* Copies the enum-related properties from type SRC to type DST.
14271 Used with the underlying type of an enum and the enum itself. */
14272 static void
14274 {
14275 tree t;
14277 {
14287 else
14291 }
14292 }
14294 /* Begin compiling the definition of an enumeration type.
14295 NAME is its name,
14297 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
14299 UNDERLYING_TYPE is the type that will be used as the storage for
14300 the enumeration type. This should be NULL_TREE if no storage type
14301 was specified.
14303 ATTRIBUTES are any attributes specified after the enum-key.
14305 SCOPED_ENUM_P is true if this is a scoped enumeration type.
14307 if IS_NEW is not NULL, gets TRUE iff a new type is created.
14309 Returns the type object, as yet incomplete.
14310 Also records info about it so that build_enumerator
14311 may be used to declare the individual values as they are read. */
14313 tree
14316 {
14322 /* [C++0x dcl.enum]p5:
14324 If not explicitly specified, the underlying type of a scoped
14325 enumeration type is int. */
14332 /* If this is the real definition for a previous forward reference,
14333 fill in the contents in the same object that used to be the
14334 forward reference. */
14340 /* In case of a template_decl, the only check that should be deferred
14341 to instantiation time is the comparison of underlying types. */
14343 {
14345 {
14351 }
14353 {
14359 }
14363 {
14369 }
14370 }
14374 {
14375 /* In case of error, make a dummy enum to allow parsing to
14376 continue. */
14378 {
14381 }
14383 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
14384 of an opaque enum, or an opaque enum of an already defined
14385 enumeration (C++11).
14386 In any other case, it'll be NULL_TREE. */
14388 {
14391 }
14394 /* Do not push the decl more than once. */
14397 {
14401 /* std::byte aliases anything. */
14406 }
14407 else
14414 /* The enum is considered opaque until the opening '{' of the
14415 enumerator list. */
14418 }
14425 {
14427 /* We already checked that it matches, don't change it to a different
14430 {
14433 }
14436 else
14439 }
14441 /* If into a template class, the returned enum is always the first
14442 declaration (opaque or not) seen. This way all the references to
14443 this type will be to the same declaration. The following ones are used
14444 only to check for definition errors. */
14447 else
14449 }
14451 /* After processing and defining all the values of an enumeration type,
14452 install their decls in the enumeration type.
14453 ENUMTYPE is the type object. */
14455 void
14457 {
14458 tree values;
14459 tree underlying_type;
14460 tree decl;
14461 tree value;
14463 tree t;
14465 bool fixed_underlying_type_p
14468 /* We built up the VALUES in reverse order. */
14471 /* For an enum defined in a template, just set the type of the values;
14472 all further processing is postponed until the template is
14473 instantiated. We need to set the type so that tsubst of a CONST_DECL
14474 works. */
14476 {
14478 values;
14482 }
14484 /* Determine the minimum and maximum values of the enumerators. */
14486 {
14490 values;
14492 {
14495 /* [dcl.enum]: Following the closing brace of an enum-specifier,
14496 each enumerator has the type of its enumeration. Prior to the
14497 closing brace, the type of each enumerator is the type of its
14498 initializing value. */
14501 /* Update the minimum and maximum values, if appropriate. */
14505 /* Figure out what the minimum and maximum values of the
14506 enumerators are. */
14513 }
14514 }
14515 else
14516 /* [dcl.enum]
14518 If the enumerator-list is empty, the underlying type is as if
14519 the enumeration had a single enumerator with value 0. */
14523 {
14524 /* Compute the number of bits require to represent all values of the
14525 enumeration. We must do this before the type of MINNODE and
14526 MAXNODE are transformed, since tree_int_cst_min_precision relies
14527 on the TREE_TYPE of the value it is passed. */
14535 /* Determine the underlying type of the enumeration.
14537 [dcl.enum]
14539 The underlying type of an enumeration is an integral type that
14540 can represent all the enumerator values defined in the
14541 enumeration. It is implementation-defined which integral type is
14542 used as the underlying type for an enumeration except that the
14543 underlying type shall not be larger than int unless the value of
14544 an enumerator cannot fit in an int or unsigned int.
14546 We use "int" or an "unsigned int" as the underlying type, even if
14547 a smaller integral type would work, unless the user has
14548 explicitly requested that we use the smallest possible type. The
14549 user can request that for all enumerations with a command line
14550 flag, or for just one enumeration with an attribute. */
14552 use_short_enum = flag_short_enums
14555 /* If the precision of the type was specified with an attribute and it
14556 was too small, give an error. Otherwise, use it. */
14558 {
14561 else
14562 {
14565 }
14566 }
14570 itk++)
14571 {
14577 }
14579 {
14580 /* DR 377
14582 IF no integral type can represent all the enumerator values, the
14583 enumeration is ill-formed. */
14588 }
14590 /* [dcl.enum]
14592 The value of sizeof() applied to an enumeration type, an object
14593 of an enumeration type, or an enumerator, is the value of sizeof()
14594 applied to the underlying type. */
14597 /* Compute the minimum and maximum values for the type.
14599 [dcl.enum]
14601 For an enumeration where emin is the smallest enumerator and emax
14602 is the largest, the values of the enumeration are the values of the
14603 underlying type in the range bmin to bmax, where bmin and bmax are,
14604 respectively, the smallest and largest values of the smallest bit-
14605 field that can store emin and emax. */
14607 /* The middle-end currently assumes that types with TYPE_PRECISION
14608 narrower than their underlying type are suitably zero or sign
14609 extended to fill their mode. Similarly, it assumes that the front
14610 end assures that a value of a particular type must be within
14611 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
14613 We used to set these fields based on bmin and bmax, but that led
14614 to invalid assumptions like optimizing away bounds checking. So
14615 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
14616 TYPE_MAX_VALUE to the values for the mode above and only restrict
14617 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
14621 set_min_and_max_values_for_integral_type
14624 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
14627 }
14628 else
14631 /* Convert each of the enumerators to the type of the underlying
14632 type of the enumeration. */
14634 {
14635 location_t saved_location;
14641 /* If the enumeration type has a fixed underlying type, we
14642 already checked all of the enumerator values. */
14644 else
14647 tf_warning_or_error);
14650 /* Do not clobber shared ints. */
14652 {
14656 }
14658 }
14660 /* Fix up all variant types of this enum type. */
14667 {
14669 /* TYPE_FIELDS needs fixup. */
14671 }
14673 /* Finish debugging output for this type. */
14676 /* Each enumerator now has the type of its enumeration. Clear the cache
14677 so that this change in types doesn't confuse us later on. */
14679 }
14681 /* Finishes the enum type. This is called only the first time an
14682 enumeration is seen, be it opaque or odinary.
14683 ENUMTYPE is the type object. */
14685 void
14687 {
14689 {
14693 }
14695 /* If this is a forward declaration, there should not be any variants,
14696 though we can get a variant in the middle of an enum-specifier with
14697 wacky code like 'enum E { e = sizeof(const E*) };' */
14701 }
14703 /* Build and install a CONST_DECL for an enumeration constant of the
14704 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
14705 Apply ATTRIBUTES if available. LOC is the location of NAME.
14706 Assignment of sequential values by default is handled here. */
14708 void
14710 location_t loc)
14711 {
14712 tree decl;
14713 tree context;
14714 tree type;
14716 /* scalar_constant_value will pull out this expression, so make sure
14717 it's folded as appropriate. */
14721 /* If the VALUE was erroneous, pretend it wasn't there; that will
14722 result in the enum being assigned the next value in sequence. */
14726 /* Remove no-op casts from the value. */
14731 {
14732 /* Validate and default VALUE. */
14734 {
14736 {
14741 }
14744 value = perform_implicit_conversion_flags
14752 {
14755 {
14759 }
14760 else
14761 {
14765 {
14769 }
14770 }
14771 }
14772 }
14774 /* Default based on previous value. */
14776 {
14778 {
14779 tree prev_value;
14781 /* C++03 7.2/4: If no initializer is specified for the first
14782 enumerator, the type is an unspecified integral
14783 type. Otherwise the type is the same as the type of the
14784 initializing value of the preceding enumerator unless the
14785 incremented value is not representable in that type, in
14786 which case the type is an unspecified integral type
14787 sufficient to contain the incremented value. */
14791 else
14792 {
14799 {
14802 {
14805 {
14811 }
14818 }
14821 else
14823 }
14826 {
14829 }
14830 }
14831 }
14832 else
14834 }
14836 /* Remove no-op casts from the value. */
14839 /* If the underlying type of the enum is fixed, check whether
14840 the enumerator values fits in the underlying type. If it
14841 does not fit, the program is ill-formed [C++0x dcl.enum]. */
14843 && value
14845 {
14850 /* Convert the value to the appropriate type. */
14852 }
14853 }
14855 /* C++ associates enums with global, function, or class declarations. */
14858 /* Build the actual enumeration constant. Note that the enumeration
14859 constants have the underlying type of the enum (if it is fixed)
14860 or the type of their initializer (if the underlying type of the
14861 enum is not fixed):
14863 [ C++0x dcl.enum ]
14865 If the underlying type is fixed, the type of each enumerator
14866 prior to the closing brace is the underlying type; if the
14867 initializing value of an enumerator cannot be represented by
14868 the underlying type, the program is ill-formed. If the
14869 underlying type is not fixed, the type of each enumerator is
14870 the type of its initializing value.
14872 If the underlying type is not fixed, it will be computed by
14873 finish_enum and we will reset the type of this enumerator. Of
14874 course, if we're processing a template, there may be no value. */
14888 {
14889 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
14890 on the TYPE_FIELDS list for `S'. (That's so that you can say
14891 things like `S::i' later.) */
14893 /* The enumerator may be getting declared outside of its enclosing
14894 class, like so:
14896 class S { public: enum E : int; }; enum S::E : int { i = 7; };
14898 For which case we need to make sure that the access of `S::i'
14899 matches the access of `S::E'. */
14905 else
14911 }
14912 else
14915 /* Add this enumeration constant to the list for this type. */
14917 }
14919 /* Look for an enumerator with the given NAME within the enumeration
14920 type ENUMTYPE. This routine is used primarily for qualified name
14921 lookup into an enumerator in C++0x, e.g.,
14923 enum class Color { Red, Green, Blue };
14925 Color color = Color::Red;
14927 Returns the value corresponding to the enumerator, or
14928 NULL_TREE if no such enumerator was found. */
14929 tree
14931 {
14932 tree e;
14937 }
14939 \f
14940 /* We're defining DECL. Make sure that its type is OK. */
14942 static void
14944 {
14948 /* In a function definition, arg types must be complete. */
14955 {
14960 /* Make it return void instead. */
14963 void_type_node,
14965 else
14967 fntype = (cp_build_type_attribute_variant
14971 }
14972 else
14973 {
14977 }
14978 }
14980 /* True iff FN is an implicitly-defined default constructor. */
14982 static bool
14984 {
14988 }
14990 /* Clobber the contents of *this to let the back end know that the object
14991 storage is dead when we enter the constructor or leave the destructor. */
14993 static tree
14995 {
14996 /* Clobbering an empty base is pointless, and harmful if its one byte
14997 TYPE_SIZE overlays real data. */
15001 /* If we have virtual bases, clobber the whole object, but only if we're in
15002 charge. If we don't have virtual bases, clobber the as-base type so we
15003 don't mess with tail padding. */
15014 {
15017 }
15024 }
15026 /* Create the FUNCTION_DECL for a function definition.
15027 DECLSPECS and DECLARATOR are the parts of the declaration;
15028 they describe the function's name and the type it returns,
15029 but twisted together in a fashion that parallels the syntax of C.
15031 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
15032 DECLARATOR is really the DECL for the function we are about to
15033 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
15034 indicating that the function is an inline defined in-class.
15036 This function creates a binding context for the function body
15037 as well as setting up the FUNCTION_DECL in current_function_decl.
15039 For C++, we must first check whether that datum makes any sense.
15040 For example, "class A local_a(1,2);" means that variable local_a
15041 is an aggregate of type A, which should have a constructor
15042 applied to it with the argument list [1, 2].
15044 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
15045 or may be a BLOCK if the function has been defined previously
15046 in this translation unit. On exit, DECL_INITIAL (decl1) will be
15047 error_mark_node if the function has never been defined, or
15048 a BLOCK if the function has been defined somewhere. */
15050 bool
15052 {
15054 tree fntype;
15055 tree restype;
15058 tree current_function_parms;
15063 /* Sanity check. */
15071 /* ISO C++ 11.4/5. A friend function defined in a class is in
15072 the (lexical) scope of the class in which it is defined. */
15074 {
15077 /* CTYPE could be null here if we're dealing with a template;
15078 for example, `inline friend float foo()' inside a template
15079 will have no CTYPE set. */
15082 else
15084 }
15091 /* Handle gnu_inline attribute. */
15093 {
15098 }
15101 /* This is a constructor, we must ensure that any default args
15102 introduced by this definition are propagated to the clones
15103 now. The clones are used directly in overload resolution. */
15106 /* Sometimes we don't notice that a function is a static member, and
15107 build a METHOD_TYPE for it. Fix that up now. */
15111 /* Set up current_class_type, and enter the scope of the class, if
15112 appropriate. */
15118 /* Now that we have entered the scope of the class, we must restore
15119 the bindings for any template parameters surrounding DECL1, if it
15120 is an inline member template. (Order is important; consider the
15121 case where a template parameter has the same name as a field of
15122 the class.) It is not until after this point that
15123 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
15127 /* Effective C++ rule 15. */
15135 /* Make the init_value nonzero so pushdecl knows this is not tentative.
15136 error_mark_node is replaced below (in poplevel) with the BLOCK. */
15140 /* This function exists in static storage.
15141 (This does not mean `static' in the C sense!) */
15144 /* We must call push_template_decl after current_class_type is set
15145 up. (If we are processing inline definitions after exiting a
15146 class scope, current_class_type will be NULL_TREE until set above
15147 by push_nested_class.) */
15149 {
15152 {
15156 }
15158 }
15160 /* Make sure the parameter and return types are reasonable. When
15161 you declare a function, these types can be incomplete, but they
15162 must be complete when you define the function. */
15165 /* Build the return declaration for the function. */
15169 {
15170 tree resdecl;
15178 }
15180 /* Record the decl so that the function name is defined.
15181 If we already have a decl for this name, and it is a FUNCTION_DECL,
15182 use the old decl. */
15184 {
15185 /* A specialization is not used to guide overload resolution. */
15189 {
15193 /* If something went wrong when registering the declaration,
15194 use DECL1; we have to have a FUNCTION_DECL to use when
15195 parsing the body of the function. */
15196 ;
15197 else
15198 {
15199 /* Otherwise, OLDDECL is either a previous declaration
15200 of the same function or DECL1 itself. */
15207 {
15208 tree context;
15210 /* Check whether DECL1 is in an anonymous
15211 namespace. */
15213 context;
15215 {
15219 }
15223 OPT_Wmissing_declarations,
15225 }
15228 }
15229 }
15230 else
15231 {
15232 /* We need to set the DECL_CONTEXT. */
15235 }
15239 /* If #pragma weak applies, mark the decl appropriately now.
15240 The pragma only applies to global functions. Because
15241 determining whether or not the #pragma applies involves
15242 computing the mangled name for the declaration, we cannot
15243 apply the pragma until after we have merged this declaration
15244 with any previous declarations; if the original declaration
15245 has a linkage specification, that specification applies to
15246 the definition as well, and may affect the mangled name. */
15249 }
15251 /* We are now in the scope of the function being defined. */
15254 /* Save the parm names or decls from this function's declarator
15255 where store_parm_decls will find them. */
15258 /* Let the user know we're compiling this function. */
15263 /* This function may already have been parsed, in which case just
15264 return; our caller will skip over the body without parsing. */
15268 /* Initialize RTL machinery. We cannot do this until
15269 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
15270 even when processing a template; this is how we get
15271 CFUN set up, and our per-function variables initialized.
15272 FIXME factor out the non-RTL stuff. */
15276 /* Initialize the language data structures. Whenever we start
15277 a new function, we destroy temporaries in the usual way. */
15283 {
15286 }
15288 /* Start the statement-tree, start the tree now. */
15291 /* If we are (erroneously) defining a function that we have already
15292 defined before, wipe out what we knew before. */
15297 {
15298 /* We know that this was set up by `grokclassfn'. We do not
15299 wait until `store_parm_decls', since evil parse errors may
15300 never get us to that point. Here we keep the consistency
15301 between `current_class_type' and `current_class_ptr'. */
15307 cp_function_chain->x_current_class_ref
15309 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
15312 /* Constructors and destructors need to know whether they're "in
15313 charge" of initializing virtual base classes. */
15316 {
15319 }
15321 {
15324 }
15325 }
15328 /* Implicitly-defined methods (like the
15329 destructor for a class in which no destructor
15330 is explicitly declared) must not be defined
15331 until their definition is needed. So, we
15332 ignore interface specifications for
15333 compiler-generated functions. */
15339 {
15346 /* This is a function in a local class in an extern inline
15347 or template function. */
15349 }
15350 /* If this function belongs to an interface, it is public.
15351 If it belongs to someone else's interface, it is also external.
15352 This only affects inlines and template instantiations. */
15354 {
15357 {
15361 && ! flag_implement_inlines
15364 /* For WIN32 we also want to put these in linkonce sections. */
15366 }
15367 else
15370 /* If this function is in an interface implemented in this file,
15371 make sure that the back end knows to emit this function
15372 here. */
15375 }
15378 {
15379 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
15380 interface, we will have both finfo->interface_unknown and
15381 finfo->interface_only set. In that case, we don't want to
15382 use the normal heuristics because someone will supply a
15383 #pragma implementation elsewhere, and deducing it here would
15384 produce a conflict. */
15389 }
15390 else
15391 {
15392 /* This is a definition, not a reference.
15393 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
15401 else
15403 }
15405 /* Determine the ELF visibility attribute for the function. We must not
15406 do this before calling "pushdecl", as we must allow "duplicate_decls"
15407 to merge any attributes appropriately. We also need to wait until
15408 linkage is set. */
15422 {
15425 }
15435 /* Clobbering an empty base is harmful if it overlays real data. */
15437 /* We can't clobber safely for an implicitly-defined default constructor
15438 because part of the initialization might happen before we enter the
15439 constructor, via AGGR_INIT_ZERO_FIRST (c++/68006). */
15453 }
15456 /* Like start_preparsed_function, except that instead of a
15457 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
15459 Returns true on success. If the DECLARATOR is not suitable
15460 for a function, we return false, which tells the parser to
15461 skip the entire function. */
15463 bool
15466 tree attrs)
15467 {
15468 tree decl1;
15474 /* If the declarator is not suitable for a function definition,
15475 cause a syntax error. */
15477 {
15480 }
15483 /* main must return int. grokfndecl should have corrected it
15484 (and issued a diagnostic) if the user got it wrong. */
15486 integer_type_node));
15489 }
15490 \f
15491 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
15492 FN. */
15494 static bool
15496 {
15498 && !processing_template_decl
15500 /* We insert the EH_SPEC_BLOCK only in the original
15501 function; then, it is copied automatically to the
15502 clones. */
15504 /* Implicitly-generated constructors and destructors have
15505 exception specifications. However, those specifications
15506 are the union of the possible exceptions specified by the
15507 constructors/destructors for bases and members, so no
15508 unallowed exception will ever reach this function. By
15509 not creating the EH_SPEC_BLOCK we save a little memory,
15510 and we avoid spurious warnings about unreachable
15511 code. */
15513 }
15515 /* Store the parameter declarations into the current function declaration.
15516 This is called after parsing the parameter declarations, before
15517 digesting the body of the function.
15519 Also install to binding contour return value identifier, if any. */
15521 static void
15523 {
15525 tree parm;
15527 /* This is a chain of any other decls that came in among the parm
15528 declarations. If a parm is declared with enum {foo, bar} x;
15529 then CONST_DECLs for foo and bar are put here. */
15533 {
15534 /* This case is when the function was defined with an ANSI prototype.
15535 The parms already have decls, so we need not do anything here
15536 except record them as in effect
15537 and complain if any redundant old-style parm decls were written. */
15540 tree next;
15542 /* Must clear this because it might contain TYPE_DECLs declared
15543 at class level. */
15546 /* If we're doing semantic analysis, then we'll call pushdecl
15547 for each of these. We must do them in reverse order so that
15548 they end in the correct forward order. */
15552 {
15556 else
15557 {
15558 /* If we find an enum constant or a type tag,
15559 put it aside for the moment. */
15562 }
15563 }
15565 /* Get the decls in their original chain order and record in the
15566 function. This is all and only the PARM_DECLs that were
15567 pushed into scope by the loop above. */
15569 }
15570 else
15573 /* Now store the final chain of decls for the arguments
15574 as the decl-chain of the current lexical scope.
15575 Put the enumerators in as well, at the front so that
15576 DECL_ARGUMENTS is not modified. */
15581 }
15583 \f
15584 /* We have finished doing semantic analysis on DECL, but have not yet
15585 generated RTL for its body. Save away our current state, so that
15586 when we want to generate RTL later we know what to do. */
15588 static void
15590 {
15593 /* Save the language-specific per-function data so that we can
15594 get it back when we really expand this function. */
15597 /* Make a copy. */
15602 /* Clear out the bits we don't need. */
15607 }
15610 /* Set the return value of the constructor (if present). */
15612 static void
15614 {
15615 tree val;
15616 tree exprstmt;
15619 {
15620 /* Any return from a constructor will end up here. */
15626 /* Return the address of the object. */
15629 }
15630 }
15632 /* Do all the processing for the beginning of a destructor; set up the
15633 vtable pointers and cleanups for bases and members. */
15635 static void
15637 {
15638 tree compound_stmt;
15640 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
15641 issued an error message. We still want to try to process the
15642 body of the function, but initialize_vtbl_ptrs will crash if
15643 TYPE_BINFO is NULL. */
15645 {
15647 /* Make all virtual function table pointers in non-virtual base
15648 classes point to CURRENT_CLASS_TYPE's virtual function
15649 tables. */
15654 /* Clobbering an empty base is harmful if it overlays real data. */
15656 {
15660 {
15662 tree ref
15669 tf_warning_or_error);
15670 /* If the vptr is shared with some virtual nearly empty base,
15671 don't clear it if not in charge, the dtor of the virtual
15672 nearly empty base will do that later. */
15675 && BINFO_VIRTUAL_P
15677 {
15679 tf_warning_or_error);
15681 }
15683 }
15684 else
15686 }
15688 /* And insert cleanups for our bases and members so that they
15689 will be properly destroyed if we throw. */
15691 }
15692 }
15694 /* At the end of every destructor we generate code to delete the object if
15695 necessary. Do that now. */
15697 static void
15699 {
15700 tree exprstmt;
15702 /* Any return from a destructor will end up here; that way all base
15703 and member cleanups will be run when the function returns. */
15707 {
15708 tree val;
15713 /* Return the address of the object. */
15716 }
15717 }
15719 /* Do the necessary processing for the beginning of a function body, which
15720 in this case includes member-initializers, but not the catch clauses of
15721 a function-try-block. Currently, this means opening a binding level
15722 for the member-initializers (in a ctor), member cleanups (in a dtor),
15723 and capture proxies (in a lambda operator()). */
15725 tree
15727 {
15728 tree stmt;
15735 else
15736 /* Always keep the BLOCK node associated with the outermost pair of
15737 curly braces of a function. These are needed for correct
15738 operation of dwarfout.c. */
15749 }
15751 /* Do the processing for the end of a function body. Currently, this means
15752 closing out the cleanups for fully-constructed bases and members, and in
15753 the case of the destructor, deleting the object if desired. Again, this
15754 is only meaningful for [cd]tors, since they are the only functions where
15755 there is a significant distinction between the main body and any
15756 function catch clauses. Handling, say, main() return semantics here
15757 would be wrong, as flowing off the end of a function catch clause for
15758 main() would also need to return 0. */
15760 void
15762 {
15766 /* Close the block. */
15775 }
15777 /* Given a function, returns the BLOCK corresponding to the outermost level
15778 of curly braces, skipping the artificial block created for constructor
15779 initializers. */
15781 tree
15783 {
15793 }
15795 /* If FNDECL is a class's key method, add the class to the list of
15796 keyed classes that should be emitted. */
15798 static void
15800 {
15804 {
15808 }
15809 }
15811 /* Subroutine of finish_function.
15812 Save the body of constexpr functions for possible
15813 future compile time evaluation. */
15815 static void
15817 {
15823 }
15825 /* Attempt to add a fix-it hint to RICHLOC suggesting the insertion
15826 of "return *this;" immediately before its location, using FNDECL's
15827 first statement (if any) to give the indentation, if appropriate. */
15829 static void
15831 {
15838 indent);
15839 }
15841 /* Finish up a function declaration and compile that function
15842 all the way to assembler language output. The free the storage
15843 for the function definition. INLINE_P is TRUE if we just
15844 finished processing the body of an in-class inline function
15845 definition. (This processing will have taken place after the
15846 class definition is complete.) */
15848 tree
15850 {
15854 /* When we get some parse errors, we can end up without a
15855 current_function_decl, so cope. */
15868 /* TREE_READONLY (fndecl) = 1;
15869 This caused &foo to be of type ptr-to-const-function
15870 which then got a warning when stored in a ptr-to-function variable. */
15873 /* The current function is being defined, so its DECL_INITIAL should
15874 be set, and unless there's a multiple definition, it should be
15875 error_mark_node. */
15878 /* For a cloned function, we've already got all the code we need;
15879 there's no need to add any extra bits. */
15881 {
15882 /* Make it so that `main' always returns 0 by default. */
15889 current_eh_spec_block);
15890 }
15892 /* If we're saving up tree structure, tie off the function now. */
15897 /* If this function can't throw any exceptions, remember that. */
15900 && !flag_non_call_exceptions
15904 /* This must come after expand_function_end because cleanups might
15905 have declarations (from inline functions) that need to go into
15906 this function's blocks. */
15908 /* If the current binding level isn't the outermost binding level
15909 for this function, either there is a bug, or we have experienced
15910 syntax errors and the statement tree is malformed. */
15912 {
15913 /* Make sure we have already experienced errors. */
15916 /* Throw away the broken statement tree and extra binding
15917 levels. */
15921 {
15924 else
15926 }
15927 }
15930 /* Statements should always be full-expressions at the outermost set
15931 of curly braces for a function. */
15934 /* If there are no return statements in a function with auto return type,
15935 the return type is void. But if the declared type is something like
15936 auto*, this is an error. */
15939 {
15941 {
15944 }
15947 {
15949 current_function_auto_return_pattern);
15952 }
15953 }
15955 // If this is a concept, check that the definition is reasonable.
15959 /* Lambda closure members are implicitly constexpr if possible. */
15963 = ((processing_template_decl
15967 /* Save constexpr function body before it gets munged by
15968 the NRV transformation. */
15971 /* Invoke the pre-genericize plugin before we start munging things. */
15975 /* Perform delayed folding before NRV transformation. */
15979 /* Set up the named return value optimization, if we can. Candidate
15980 variables are selected in check_return_expr. */
15982 {
15984 tree outer;
15987 /* This is only worth doing for fns that return in memory--and
15988 simpler, since we don't have to worry about promoted modes. */
15990 /* Only allow this for variables declared in the outer scope of
15991 the function so we know that their lifetime always ends with a
15992 return; see g++.dg/opt/nrv6.C. We could be more flexible if
15993 we were to do this optimization in tree-ssa. */
15999 }
16001 /* Remember that we were in class scope. */
16005 /* Must mark the RESULT_DECL as being in this function. */
16008 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
16009 to the FUNCTION_DECL node itself. */
16012 /* Save away current state, if appropriate. */
16016 /* Complain if there's just no return statement. */
16021 /* Don't complain if we abort or throw. */
16022 && !current_function_returns_abnormally
16023 /* Don't complain if there's an infinite loop. */
16024 && !current_function_infinite_loop
16025 /* Don't complain if we are declared noreturn. */
16029 /* Structor return values (if any) are set by the compiler. */
16033 {
16035 /* Potentially add a "return *this;" fix-it hint for
16036 assignment operators. */
16038 {
16041 && same_type_ignoring_top_level_qualifiers_p
16046 }
16050 }
16052 /* Store the end of the function, so that we get good line number
16053 info for the epilogue. */
16056 /* Complain about parameters that are only set, but never otherwise used. */
16058 && !processing_template_decl
16061 {
16062 tree decl;
16065 decl;
16079 OPT_Wunused_but_set_parameter,
16082 }
16084 /* Complain about locally defined typedefs that are not used in this
16085 function. */
16088 /* Possibly warn about unused parameters. */
16090 && !processing_template_decl
16094 /* Genericize before inlining. */
16096 {
16099 /* Clear out the bits we don't need. */
16109 }
16110 /* Clear out the bits we don't need. */
16113 /* We're leaving the context of this function, so zap cfun. It's still in
16114 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
16118 /* If this is an in-class inline definition, we may have to pop the
16119 bindings for the template parameters that we added in
16120 maybe_begin_member_template_processing when start_function was
16121 called. */
16125 /* Leave the scope of the class. */
16131 /* Clean up. */
16136 }
16137 \f
16138 /* Create the FUNCTION_DECL for a function definition.
16139 DECLSPECS and DECLARATOR are the parts of the declaration;
16140 they describe the return type and the name of the function,
16141 but twisted together in a fashion that parallels the syntax of C.
16143 This function creates a binding context for the function body
16144 as well as setting up the FUNCTION_DECL in current_function_decl.
16146 Returns a FUNCTION_DECL on success.
16148 If the DECLARATOR is not suitable for a function (it defines a datum
16149 instead), we return 0, which tells yyparse to report a parse error.
16151 May return void_type_node indicating that this method is actually
16152 a friend. See grokfield for more details.
16154 Came here with a `.pushlevel' .
16156 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
16157 CHANGES TO CODE IN `grokfield'. */
16159 tree
16162 {
16170 {
16173 }
16178 /* Pass friends other than inline friend functions back. */
16183 {
16188 }
16197 /* We process method specializations in finish_struct_1. */
16199 {
16203 }
16206 {
16208 {
16211 }
16212 }
16218 }
16219 \f
16221 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
16222 we can lay it out later, when and if its type becomes complete.
16224 Also handle constexpr variables where the initializer involves
16225 an unlowered PTRMEM_CST because the class isn't complete yet. */
16227 void
16229 {
16232 /* Keep track of variables with incomplete types. */
16235 {
16243 /* RTTI TD entries are created while defining the type_info. */
16246 {
16249 }
16253 {
16254 /* When the outermost open class is complete we can resolve any
16255 pointers-to-members. */
16259 }
16260 }
16261 }
16263 /* Called when a class type (given by TYPE) is defined. If there are
16264 any existing VAR_DECLs whose type has been completed by this
16265 declaration, update them now. */
16267 void
16269 {
16274 {
16276 {
16283 {
16284 /* Complete the type of the variable. The VAR_DECL itself
16285 will be laid out in expand_expr. */
16288 }
16290 /* Remove this entry from the list. */
16292 }
16293 else
16294 ix++;
16295 }
16297 /* Check for pending declarations which may have abstract type. */
16299 }
16301 /* If DECL is of a type which needs a cleanup, build and return an
16302 expression to perform that cleanup here. Return NULL_TREE if no
16303 cleanup need be done. DECL can also be a _REF when called from
16304 split_nonconstant_init_1. */
16306 tree
16308 {
16309 tree type;
16310 tree attr;
16311 tree cleanup;
16313 /* Assume no cleanup is required. */
16319 /* Handle "__attribute__((cleanup))". We run the cleanup function
16320 before the destructor since the destructor is what actually
16321 terminates the lifetime of the object. */
16324 else
16327 {
16328 tree id;
16329 tree fn;
16330 tree arg;
16332 /* Get the name specified by the user for the cleanup function. */
16334 /* Look up the name to find the cleanup function to call. It is
16335 important to use lookup_name here because that is what is
16336 used in c-common.c:handle_cleanup_attribute when performing
16337 initial checks on the attribute. Note that those checks
16338 include ensuring that the function found is not an overloaded
16339 function, or an object with an overloaded call operator,
16340 etc.; we can rely on the fact that the function found is an
16341 ordinary FUNCTION_DECL. */
16349 }
16350 /* Handle ordinary C++ destructors. */
16353 {
16355 tree addr;
16356 tree call;
16360 else
16371 else
16373 }
16375 /* build_delete sets the location of the destructor call to the
16376 current location, even though the destructor is going to be
16377 called later, at the end of the current scope. This can lead to
16378 a "jumpy" behavior for users of debuggers when they step around
16379 the end of the block. So let's unset the location of the
16380 destructor call instead. */
16386 /* Treat objects with destructors as used; the destructor may do
16387 something substantive. */
16392 }
16394 \f
16395 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
16396 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
16397 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
16399 tree
16401 {
16402 tree fntype;
16403 tree args;
16416 fntype = (cp_build_type_attribute_variant
16420 }
16422 /* DECL was originally constructed as a non-static member function,
16423 but turned out to be static. Update it accordingly. */
16425 void
16427 {
16440 }
16442 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
16443 one of the language-independent trees. */
16445 enum cp_tree_node_structure_enum
16447 {
16449 {
16466 }
16467 }
16469 /* Build the void_list_node (void_type_node having been created). */
16470 tree
16472 {
16475 }
16477 bool
16479 {
16480 /* A missing noreturn is ok for the `main' function. */
16482 }
16484 /* Return the decl used to identify the COMDAT group into which DECL should
16485 be placed. */
16487 tree
16489 {
16490 /* Virtual tables, construction virtual tables, and virtual table
16491 tables all go in a single COMDAT group, named after the primary
16492 virtual table. */
16495 /* For all other DECLs, the COMDAT group is the mangled name of the
16496 declaration itself. */
16497 else
16498 {
16500 {
16501 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
16502 into the same section as the target function. In that case
16503 we must return target's name. */
16509 else
16511 }
16512 }
16515 }
16517 /* Returns the return type for FN as written by the user, which may include
16518 a placeholder for a deduced return type. */
16520 tree
16522 {
16525 {
16532 }
16534 }
16536 /* Returns true iff DECL is a variable or function declared with an auto type
16537 that has not yet been deduced to a real type. */
16539 bool
16541 {
16547 }
16549 /* Complain if DECL has an undeduced return type. */
16551 bool
16553 {
16555 {
16559 }
16561 }