| blob | 0ce8f2d343589677e7e8113179a345f8f5b69a37 |
1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988-2017 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. */
56 /* Possible cases of bad specifiers type used by bad_specifiers. */
61 BSP_FIELD /* field */
62 };
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;
582 scope_kind kind;
586 restart:
599 /* We used to use KEEP == 2 to indicate that the new block should go
600 at the beginning of the list of blocks at this binding level,
601 rather than the end. This hack is no longer used. */
607 /* Any uses of undefined labels, and any defined labels, now operate
608 under constraints of next binding contour. */
613 /* Get the decls in the order they were written.
614 Usually current_binding_level->names is in reverse order.
615 But parameter decls were previously put in forward order. */
619 {
622 }
624 /* If there were any declarations or structure tags in that level,
625 or if this level is a function body,
626 create a BLOCK to record them for the life of this function. */
628 /* Avoid function body block if possible. */
634 {
637 }
639 /* In each subblock, record that this is its superior. */
644 /* We still support the old for-scope rules, whereby the variables
645 in a init statement were in scope after the for-statement ended.
646 We only use the new rules if flag_new_for_scope is nonzero. */
647 leaving_for_scope
650 /* Before we remove the declarations first check for unused variables. */
655 {
656 /* There are cases where D itself is a TREE_LIST. See in
657 push_local_binding where the list of decls returned by
658 getdecls is built. */
665 /* For structured bindings, consider only real variables, not
666 subobjects. */
674 {
676 {
679 OPT_Wunused_variable,
681 else
684 }
686 // For -Wunused-but-set-variable leave references alone.
689 {
694 else
696 OPT_Wunused_but_set_variable,
699 }
700 }
701 }
703 /* Remove declarations for all the DECLs in this level. */
705 {
710 /* It's hard to make this ARM compatibility hack play nicely with
711 lambdas, and it really isn't necessary in C++11 mode. */
714 {
723 /* We have something like:
725 int i;
726 for (int i; ;);
728 and we are leaving the `for' scope. There's no reason to
729 keep the binding of the inner `i' in this case. */
730 ;
733 /* Here, we have something like:
735 typedef int I;
737 void f () {
738 for (int I; ;);
739 }
741 We must pop the for-scope binding so we know what's a
742 type and what isn't. */
743 ;
744 else
745 {
746 /* Mark this VAR_DECL as dead so that we can tell we left it
747 there only for backward compatibility. */
750 /* Keep track of what should have happened when we
751 popped the binding. */
753 {
756 }
758 /* Add it to the list of dead variables in the next
759 outermost binding to that we can remove these when we
760 leave that binding. */
763 link);
765 /* Although we don't pop the cxx_binding, we do clear
766 its SCOPE since the scope is going away now. */
770 /* Don't remove the binding. */
772 }
773 }
774 /* Remove the binding. */
777 else
779 }
781 /* Remove declarations for any `for' variables from inner scopes
782 that we kept around. */
787 /* Restore the IDENTIFIER_TYPE_VALUEs. */
792 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
793 list if a `using' declaration put them there. The debugging
794 back ends won't understand OVERLOAD, so we remove them here.
795 Because the BLOCK_VARS are (temporarily) shared with
796 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
797 popped all the bindings. Also remove undeduced 'auto' decls,
798 which LTO doesn't understand, and can't have been used by anything. */
800 {
804 {
806 || (!processing_template_decl
809 else
811 }
812 }
814 /* If the level being exited is the top level of a function,
815 check over all the labels. */
817 {
819 {
820 /* Since this is the top level block of a function, the vars are
821 the function's parameters. Don't leave them in the BLOCK
822 because they are found in the FUNCTION_DECL instead. */
825 }
826 else
828 }
832 {
833 tree stmt;
835 /* If this is a temporary binding created for a cleanup, then we'll
836 have pushed a statement list level. Pop that, create a new
837 BIND_EXPR for the block, and insert it into the stream. */
841 }
845 {
846 /* The current function is being defined, so its DECL_INITIAL
847 should be error_mark_node. */
851 {
853 {
856 }
857 else
859 }
860 }
862 current_binding_level->blocks
865 /* If we did not make a block for the level just exited,
866 any blocks made for inner levels
867 (since they cannot be recorded as subblocks in that level)
868 must be carried forward so they will later become subblocks
869 of something else. */
871 current_binding_level->blocks
874 /* Each and every BLOCK node created here in `poplevel' is important
875 (e.g. for proper debugging information) so if we created one
876 earlier, mark it as "used". */
880 /* All temporary bindings created for cleanups are popped silently. */
886 }
888 /* Call wrapup_globals_declarations for the globals in NAMESPACE. */
889 /* Diagnose odr-used extern inline variables without definitions
890 in the current TU. */
892 int
894 {
896 {
897 tree decl;
900 {
910 OPT_Wunused_function,
919 }
921 /* Clear out the list, so we don't rescan next time. */
924 /* Write out any globals that need to be output. */
927 }
929 }
930 \f
931 /* In C++, you don't have to write `struct S' to refer to `S'; you
932 can just use `S'. We accomplish this by creating a TYPE_DECL as
933 if the user had written `typedef struct S S'. Create and return
934 the TYPE_DECL for TYPE. */
936 tree
938 {
939 tree decl;
943 /* There are other implicit type declarations, like the one *within*
944 a class that allows you to write `S::S'. We must distinguish
945 amongst these. */
951 }
953 /* Remember a local name for name-mangling purposes. */
955 static void
957 {
967 {
970 {
975 else
981 }
982 }
986 }
987 \f
988 /* Subroutine of duplicate_decls: return truthvalue of whether
989 or not types of these decls match.
991 For C++, we must compare the parameter list so that `int' can match
992 `int&' in a parameter position, but `int&' is not confused with
993 `const int&'. */
995 int
997 {
1004 /* If the two DECLs are not even the same kind of thing, we're not
1005 interested in their types. */
1011 {
1016 tree r2;
1018 /* Specializations of different templates are different functions
1019 even if they have the same type. */
1034 /* A new declaration doesn't match a built-in one unless it
1035 is also extern "C". */
1043 /* A declaration with deduced return type should use its pre-deduction
1044 type for declaration matching. */
1048 {
1051 #ifndef NO_IMPLICIT_EXTERN_C
1054 #endif
1055 ))
1056 {
1060 }
1061 #ifndef NO_IMPLICIT_EXTERN_C
1069 {
1072 }
1073 #endif
1074 else
1075 types_match =
1081 }
1082 else
1085 /* The decls dont match if they correspond to two different versions
1086 of the same function. Disallow extern "C" functions to be
1087 versions for now. */
1093 }
1095 {
1109 else
1110 // We don't need to check equivalently_constrained for variable and
1111 // function templates because we check it on the results.
1113 }
1114 else
1115 {
1116 /* Need to check scope for variable declaration (VAR_DECL).
1117 For typedef (TYPE_DECL), scope is ignored. */
1120 /* [dcl.link]
1121 Two declarations for an object with C language linkage
1122 with the same name (ignoring the namespace that qualify
1123 it) that appear in different namespace scopes refer to
1124 the same object. */
1134 else
1137 COMPARE_REDECLARATION);
1138 }
1140 // Normal functions can be constrained, as can variable partial
1141 // specializations.
1146 }
1148 /* NEWDECL and OLDDECL have identical signatures. If they are
1149 different versions adjust them and return true. */
1151 bool
1153 {
1160 {
1165 }
1168 {
1173 }
1175 /* Only record if at least one was not already versions. */
1180 }
1182 /* If NEWDECL is `static' and an `extern' was seen previously,
1183 warn about it. OLDDECL is the previous declaration.
1185 Note that this does not apply to the C++ case of declaring
1186 a variable `extern const' and then later `const'.
1188 Don't complain about built-in functions, since they are beyond
1189 the user's control. */
1191 void
1193 {
1200 /* Don't get confused by static member functions; that's a different
1201 use of `static'. */
1206 /* If the old declaration was `static', or the new one isn't, then
1207 everything is OK. */
1211 /* It's OK to declare a builtin function as `static'. */
1220 }
1222 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1223 function templates. If their exception specifications do not
1224 match, issue a diagnostic. */
1226 static void
1228 tree old_decl)
1229 {
1233 /* Two default specs are equivalent, don't force evaluation. */
1243 /* [except.spec]
1245 If any declaration of a function has an exception-specification,
1246 all declarations, including the definition and an explicit
1247 specialization, of that function shall have an
1248 exception-specification with the same set of type-ids. */
1251 {
1259 /* We used to silently permit mismatched eh specs with
1260 -fno-exceptions, so make them a pedwarn now. */
1262 else
1267 }
1268 }
1270 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1271 Otherwise issue diagnostics. */
1273 static bool
1275 {
1285 {
1287 {
1288 /* Hide a built-in declaration. */
1292 }
1293 /* 7.1.5 [dcl.constexpr]
1294 Note: An explicit specialization can differ from the template
1295 declaration with respect to the constexpr specifier. */
1301 "redeclaration %qD differs in %<constexpr%> "
1306 }
1308 }
1310 // If OLDDECL and NEWDECL are concept declarations with the same type
1311 // (i.e., and template parameters), but different requirements,
1312 // emit diagnostics and return true. Otherwise, return false.
1315 {
1327 {
1332 {
1335 }
1336 }
1338 }
1340 /* DECL is a redeclaration of a function or function template. If
1341 it does have default arguments issue a diagnostic. Note: this
1342 function is used to enforce the requirements in C++11 8.3.6 about
1343 no default arguments in redeclarations. */
1345 static void
1347 {
1353 {
1355 "redeclaration of %q#D may not have default "
1358 }
1359 }
1361 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1363 DECL_ATTRIBUTES (fn)))
1365 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1366 If the redeclaration is invalid, a diagnostic is issued, and the
1367 error_mark_node is returned. Otherwise, OLDDECL is returned.
1369 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1370 returned.
1372 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1374 tree
1376 {
1380 tree new_template_info;
1387 /* If either the type of the new decl or the type of the old decl is an
1388 error_mark_node, then that implies that we have already issued an
1389 error (earlier) for some bogus type specification, and in that case,
1390 it is rather pointless to harass the user with yet more error message
1391 about the same declaration, so just pretend the types match here. */
1398 {
1409 }
1415 {
1419 else
1422 }
1424 /* Check for redeclaration and other discrepancies. */
1427 {
1430 {
1431 /* Avoid warnings redeclaring built-ins which have not been
1432 explicitly declared. */
1434 {
1438 OPT_Wbuiltin_declaration_mismatch,
1440 newdecl);
1442 }
1444 /* If you declare a built-in or predefined function name as static,
1445 the old definition is overridden, but optionally warn this was a
1446 bad choice of name. */
1448 {
1453 /* Discard the old built-in function. */
1455 }
1456 /* If the built-in is not ansi, then programs can override
1457 it even globally without an error. */
1462 else
1466 }
1468 {
1475 }
1477 {
1478 /* Avoid warnings redeclaring built-ins which have not been
1479 explicitly declared. */
1481 {
1484 /* A new declaration doesn't match a built-in one unless it
1485 is also extern "C". */
1495 {
1498 /* FILE, tm types are not known at the time
1499 we create the builtins. */
1505 {
1512 {
1520 newdecl_is_friend);
1522 }
1524 }
1528 next_arg:;
1529 }
1532 OPT_Wbuiltin_declaration_mismatch,
1533 "declaration of %q#D conflicts with built-in "
1535 }
1540 {
1541 /* A near match; override the builtin. */
1545 OPT_Wbuiltin_declaration_mismatch,
1546 "new declaration %q#D ambiguates built-in "
1548 else
1553 }
1554 else
1555 /* Discard the old built-in function. */
1558 /* Replace the old RTL to avoid problems with inlining. */
1560 }
1561 /* Even if the types match, prefer the new declarations type for
1562 built-ins which have not been explicitly declared, for
1563 exception lists, etc... */
1565 {
1572 }
1574 /* If a function is explicitly declared "throw ()", propagate that to
1575 the corresponding builtin. */
1580 {
1585 }
1587 /* Whether or not the builtin can throw exceptions has no
1588 bearing on this declarator. */
1592 {
1593 /* If a builtin function is redeclared as `static', merge
1594 the declarations, but make the original one static. */
1598 /* Make the old declaration consistent with the new one so
1599 that all remnants of the builtin-ness of this function
1600 will be banished. */
1603 }
1604 }
1606 {
1607 /* C++ Standard, 3.3, clause 4:
1608 "[Note: a namespace name or a class template name must be unique
1609 in its declarative region (7.3.2, clause 14). ]" */
1616 {
1621 {
1622 /* We do nothing special here, because C++ does such nasty
1623 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1624 get shadowed, and know that if we need to find a TYPE_DECL
1625 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1626 slot of the identifier. */
1628 }
1635 }
1644 }
1646 {
1648 /* These are certainly not duplicate declarations; they're
1649 from different scopes. */
1653 {
1654 /* The name of a class template may not be declared to refer to
1655 any other template, class, function, object, namespace, value,
1656 or type in the same scope. */
1659 {
1664 }
1671 /* Template functions can be disambiguated by
1672 return type. */
1675 // Template functions can also be disambiguated by
1676 // constraints.
1678 {
1682 }
1686 }
1688 {
1690 {
1692 newdecl);
1696 }
1697 /* For function versions, params and types match, but they
1698 are not ambiguous. */
1701 // The functions have the same parameter types.
1704 // And the same constraints.
1706 {
1711 }
1712 else
1714 }
1715 else
1716 {
1721 }
1722 }
1732 /* It's OK to have a template specialization and a non-template
1733 with the same type, or to have specializations of two
1734 different templates with the same type. Note that if one is a
1735 specialization, and the other is an instantiation of the same
1736 template, that we do not exit at this point. That situation
1737 can occur if we instantiate a template class, and then
1738 specialize one of its methods. This situation is valid, but
1739 the declarations must be merged in the usual way. */
1746 /* One of the declarations is a template instantiation, and the
1747 other is not a template at all. That's OK. */
1750 {
1751 /* In [namespace.alias] we have:
1753 In a declarative region, a namespace-alias-definition can be
1754 used to redefine a namespace-alias declared in that declarative
1755 region to refer only to the namespace to which it already
1756 refers.
1758 Therefore, if we encounter a second alias directive for the same
1759 alias, we can just ignore the second directive. */
1765 /* Leave it to update_binding to merge or report error. */
1767 }
1768 else
1769 {
1772 {
1780 }
1785 {
1786 /* Prototype decl follows defn w/o prototype. */
1791 }
1794 {
1795 /* [dcl.link]
1796 If two declarations of the same function or object
1797 specify different linkage-specifications ..., the program
1798 is ill-formed.... Except for functions with C++ linkage,
1799 a function declaration without a linkage specification
1800 shall not precede the first linkage specification for
1801 that function. A function can be declared without a
1802 linkage specification after an explicit linkage
1803 specification has been seen; the linkage explicitly
1804 specified in the earlier declaration is not affected by
1805 such a function declaration.
1807 DR 563 raises the question why the restrictions on
1808 functions should not also apply to objects. Older
1809 versions of G++ silently ignore the linkage-specification
1810 for this example:
1812 namespace N {
1813 extern int i;
1814 extern "C" int i;
1815 }
1817 which is clearly wrong. Therefore, we now treat objects
1818 like functions. */
1820 {
1821 /* There is no explicit linkage-specification, so we use
1822 the linkage from the previous declaration. */
1825 }
1826 else
1827 {
1833 }
1834 }
1837 ;
1839 {
1840 /* Note: free functions, as TEMPLATE_DECLs, are handled below. */
1843 as FUNCTION_DECLs. */
1845 /* C++11 8.3.6/6.
1846 Default arguments for a member function of a class
1847 template shall be specified on the initial declaration
1848 of the member function within the class template. */
1851 else
1852 {
1860 {
1863 {
1865 "default argument given for parameter "
1869 olddecl);
1870 }
1871 else
1872 {
1877 olddecl);
1878 }
1879 }
1880 }
1881 }
1882 }
1884 /* Do not merge an implicit typedef with an explicit one. In:
1886 class A;
1887 ...
1888 typedef class A A __attribute__ ((foo));
1890 the attribute should apply only to the typedef. */
1896 /* If new decl is `static' and an `extern' was seen previously,
1897 warn about it. */
1903 /* We have committed to returning 1 at this point. */
1905 {
1906 /* Now that functions must hold information normally held
1907 by field decls, there is extra work to do so that
1908 declaration information does not get destroyed during
1909 definition. */
1927 /* Optionally warn about more than one declaration for the same
1928 name, but don't warn about a function declaration followed by a
1929 definition. */
1932 /* Don't warn about extern decl followed by definition. */
1934 /* Don't warn about friends, let add_friend take care of it. */
1936 /* Don't warn about declaration followed by specialization. */
1939 {
1941 OPT_Wredundant_decls,
1943 newdecl))
1946 }
1950 {
1952 {
1956 }
1958 }
1959 }
1961 /* Deal with C++: must preserve virtual function table size. */
1963 {
1973 }
1975 /* Copy all the DECL_... slots specified in the new decl
1976 except for any that we copy here from the old type. */
1981 {
1987 {
1990 }
1991 }
1994 {
1995 tree old_result;
1996 tree new_result;
2008 {
2009 /* Per C++11 8.3.6/4, default arguments cannot be added in later
2010 declarations of a function template. */
2019 {
2022 else
2034 }
2035 else
2036 {
2042 }
2043 }
2045 /* If the new declaration is a definition, update the file and
2046 line information on the declaration, and also make
2047 the old declaration the same definition. */
2049 {
2055 {
2056 tree parm;
2062 }
2063 }
2066 }
2069 {
2073 /* Automatically handles default parameters. */
2075 tree newtype;
2077 /* For typedefs use the old type, as the new type's DECL_NAME points
2078 at newdecl, which will be ggc_freed. */
2080 {
2081 /* But NEWTYPE might have an attribute, honor that. */
2086 {
2090 }
2092 /* And remove the new type from the variants list. */
2094 {
2099 {
2102 }
2103 }
2104 }
2105 else
2106 /* Merge the data types specified in the two decls. */
2110 {
2112 /* For already initialized vars, TREE_READONLY could have been
2113 cleared in cp_finish_decl, because the var needs runtime
2114 initialization or destruction. Make sure not to set
2115 TREE_READONLY on it again. */
2129 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
2132 {
2133 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
2136 }
2137 }
2139 /* An explicit specialization of a function template or of a member
2140 function of a class template can be declared transaction_safe
2141 independently of whether the corresponding template entity is declared
2142 transaction_safe. */
2155 /* Lay the type out, unless already done. */
2169 /* Merge the type qualifiers. */
2177 /* Merge deprecatedness. */
2181 /* Preserve function specific target and optimization options */
2183 {
2193 }
2195 /* Merge the initialization information. */
2198 {
2202 {
2205 }
2206 }
2209 {
2221 /* Keep the old RTL. */
2223 }
2226 {
2227 /* Keep the old RTL. We cannot keep the old RTL if the old
2228 declaration was for an incomplete object and the new
2229 declaration is not since many attributes of the RTL will
2230 change. */
2232 }
2233 }
2234 /* If cannot merge, then use the new type and qualifiers,
2235 and don't preserve the old rtl. */
2236 else
2237 {
2238 /* Clean out any memory we had of the old declaration. */
2248 }
2250 /* Merge the storage class information. */
2263 {
2272 {
2279 }
2282 {
2286 }
2291 /* If the OLDDECL is an instantiation and/or specialization,
2292 then the NEWDECL must be too. But, it may not yet be marked
2293 as such if the caller has created NEWDECL, but has not yet
2294 figured out that it is a redeclaration. */
2298 /* Don't really know how much of the language-specific
2299 values we should copy from old to new. */
2306 {
2310 {
2314 /* Remember the presence of explicit specialization args. */
2317 }
2319 }
2320 /* Only functions have these fields. */
2322 {
2327 /* DECL_THUNKS is only valid for virtual functions,
2328 otherwise it is a DECL_FRIEND_CONTEXT. */
2331 }
2332 /* Only variables have this field. */
2336 }
2339 {
2340 tree parm;
2342 /* Merge parameter attributes. */
2351 }
2355 {
2356 /* If newdecl is not a specialization, then it is not a
2357 template-related function at all. And that means that we
2358 should have exited above, returning 0. */
2362 /* From [temp.expl.spec]:
2364 If a template, a member template or the member of a class
2365 template is explicitly specialized then that
2366 specialization shall be declared before the first use of
2367 that specialization that would cause an implicit
2368 instantiation to take place, in every translation unit in
2369 which such a use occurs. */
2371 olddecl);
2377 /* Don't propagate visibility from the template to the
2378 specialization here. We'll do that in determine_visibility if
2379 appropriate. */
2382 /* [temp.expl.spec/14] We don't inline explicit specialization
2383 just because the primary template says so. */
2385 /* But still keep DECL_DISREGARD_INLINE_LIMITS in sync with
2386 the always_inline attribute. */
2389 {
2392 else
2396 }
2397 }
2399 {
2400 /* Never inline re-defined extern inline functions.
2401 FIXME: this could be better handled by keeping both
2402 function as separate declarations. */
2404 }
2405 else
2406 {
2408 {
2412 }
2414 ;
2428 }
2430 /* Preserve abstractness on cloned [cd]tors. */
2433 /* Update newdecl's parms to point at olddecl. */
2439 {
2443 }
2445 {
2446 /* These need to be copied so that the names are available.
2447 Note that if the types do match, we'll preserve inline
2448 info and other bits, but if not, we won't. */
2451 }
2452 /* If redeclaring a builtin function, it stays built in
2453 if newdecl is a gnu_inline definition, or if newdecl is just
2454 a declaration. */
2457 {
2460 /* If we're keeping the built-in definition, keep the rtl,
2461 regardless of declaration matches. */
2464 {
2467 {
2468 /* If a compatible prototype of these builtin functions
2469 is seen, assume the runtime implements it with the
2470 expected semantics. */
2479 }
2480 }
2483 }
2485 /* If defining a function declared with other language
2486 linkage, use the previously declared language linkage. */
2489 {
2491 /* Don't clear out the arguments if we're just redeclaring a
2492 function. */
2495 }
2496 }
2500 /* Now preserve various other info from the definition. */
2506 /* Warn about conflicting visibility specifications. */
2510 {
2512 "%qD: visibility attribute ignored because it "
2516 }
2517 /* Choose the declaration which specified visibility. */
2519 {
2522 }
2523 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2524 so keep this behavior. */
2526 {
2529 }
2530 /* Likewise for DECL_ALIGN, DECL_USER_ALIGN and DECL_PACKED. */
2532 {
2535 }
2544 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2545 with that from NEWDECL below. */
2547 {
2551 }
2553 /* Merge the USED information. */
2559 {
2564 }
2570 /* Merge the DECL_FUNCTION_VERSIONED information. newdecl will be copied
2571 to olddecl and deleted. */
2574 {
2575 /* Set the flag for newdecl so that it gets copied to olddecl. */
2577 /* newdecl will be purged after copying to olddecl and is no longer
2578 a version. */
2580 }
2583 {
2597 /* Preserve symtab node mapping. */
2601 /* If newdecl is a template instantiation, it is possible that
2602 the following sequence of events has occurred:
2604 o A friend function was declared in a class template. The
2605 class template was instantiated.
2607 o The instantiation of the friend declaration was
2608 recorded on the instantiation list, and is newdecl.
2610 o Later, however, instantiate_class_template called pushdecl
2611 on the newdecl to perform name injection. But, pushdecl in
2612 turn called duplicate_decls when it discovered that another
2613 declaration of a global function with the same name already
2614 existed.
2616 o Here, in duplicate_decls, we decided to clobber newdecl.
2618 If we're going to do that, we'd better make sure that
2619 olddecl, and not newdecl, is on the list of
2620 instantiations so that if we try to do the instantiation
2621 again we won't get the clobbered declaration. */
2623 new_template_info,
2624 olddecl);
2625 }
2626 else
2627 {
2634 {
2642 {
2655 }
2663 }
2664 }
2667 {
2671 {
2672 /* Merge the section attribute.
2673 We want to issue an error if the sections conflict but that must be
2674 done later in decl_attributes since we are called before attributes
2675 are assigned. */
2680 {
2684 else
2688 }
2689 }
2693 {
2697 }
2698 }
2704 {
2707 }
2709 /* NEWDECL contains the merged attribute lists.
2710 Update OLDDECL to be the same. */
2713 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2714 so that encode_section_info has a chance to look at the new decl
2715 flags and attributes. */
2722 /* The NEWDECL will no longer be needed. Because every out-of-class
2723 declaration of a member results in a call to duplicate_decls,
2724 freeing these nodes represents in a significant savings.
2726 Before releasing the node, be sore to remove function from symbol
2727 table that might have been inserted there to record comdat group.
2728 Be sure to however do not free DECL_STRUCT_FUNCTION because this
2729 structure is shared in between newdecl and oldecl. */
2733 {
2737 }
2739 /* Remove the associated constraints for newdecl, if any, before
2740 reclaiming memory. */
2747 }
2748 \f
2749 /* Return zero if the declaration NEWDECL is valid
2750 when the declaration OLDDECL (assumed to be for the same name)
2751 has already been seen.
2752 Otherwise return an error message format string with a %s
2753 where the identifier should go. */
2757 {
2759 {
2760 /* Because C++ can put things into name space for free,
2761 constructs like "typedef struct foo { ... } foo"
2762 would look like an erroneous redeclaration. */
2765 else
2767 }
2769 {
2770 /* If this is a pure function, its olddecl will actually be
2771 the original initialization to `0' (which we force to call
2772 abort()). Don't complain about redefinition in this case. */
2777 /* If both functions come from different namespaces, this is not
2778 a redeclaration - this is a conflict with a used function. */
2784 /* We'll complain about linkage mismatches in
2785 warn_extern_redeclared_static. */
2787 /* Defining the same name twice is no good. */
2790 {
2796 }
2799 {
2804 {
2808 else
2811 }
2812 }
2814 check_abi_tag_redeclaration
2819 }
2821 {
2825 {
2830 }
2848 {
2853 {
2857 else
2860 }
2861 }
2863 /* Core issue #226 (C++0x):
2865 If a friend function template declaration specifies a
2866 default template-argument, that declaration shall be a
2867 definition and shall be the only declaration of the
2868 function template in the translation unit. */
2879 }
2885 {
2886 /* Only variables can be thread-local, and all declarations must
2887 agree on this property. */
2891 else
2894 }
2896 {
2897 /* The objects have been declared at namespace scope. If either
2898 is a member of an anonymous union, then this is an invalid
2899 redeclaration. For example:
2901 int i;
2902 union { int i; };
2904 is invalid. */
2908 /* If at least one declaration is a reference, there is no
2909 conflict. For example:
2911 int i = 3;
2912 extern int i;
2914 is valid. */
2918 /* Static data member declared outside a class definition
2919 if the variable is defined within the class with constexpr
2920 specifier is declaration rather than definition (and
2921 deprecated). */
2926 {
2928 /* For now, only warn with explicit -Wdeprecated. */
2931 "redundant redeclaration of %<constexpr%> static "
2936 }
2938 /* Reject two definitions. */
2940 }
2941 else
2942 {
2943 /* Objects declared with block scope: */
2944 /* Reject two definitions, and reject a definition
2945 together with an external reference. */
2949 }
2950 }
2951 \f
2953 /* Hash and equality functions for the named_label table. */
2955 hashval_t
2957 {
2959 }
2961 bool
2963 {
2965 }
2967 /* Look for a label named ID in the current function. If one cannot
2968 be found, create one. Return the named_label_entry, or NULL on
2969 failure. */
2973 {
2974 /* You can't use labels at global scope. */
2976 {
2979 }
2985 named_label_entry **slot
2990 {
2995 {
2999 }
3000 }
3002 /* We are making a new decl, create or reuse the named_label_entry */
3006 else
3007 {
3012 }
3014 /* Now create the LABEL_DECL. */
3020 {
3024 }
3029 }
3031 /* Wrapper for lookup_label_1. */
3033 tree
3035 {
3040 }
3042 tree
3044 {
3049 }
3051 /* Returns nonzero if it is ill-formed to jump past the declaration of
3052 DECL. Returns 2 if it's also a real problem. */
3054 static int
3056 {
3057 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
3058 with automatic storage duration is not in scope to a point where it is
3059 in scope is ill-formed unless the variable has scalar type, class type
3060 with a trivial default constructor and a trivial destructor, a
3061 cv-qualified version of one of these types, or an array of one of the
3062 preceding types and is declared without an initializer (8.5). */
3077 }
3079 /* A subroutine of check_previous_goto_1 and check_goto to identify a branch
3080 to the user. */
3082 static bool
3084 diagnostic_t diag_kind)
3085 {
3086 bool complained
3093 }
3095 /* Check that a single previously seen jump to a newly defined label
3096 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
3097 the jump context; NAMES are the names in scope in LEVEL at the jump
3098 context; LOCUS is the source position of the jump or 0. Returns
3099 true if all is well. */
3101 static bool
3104 {
3111 {
3117 }
3120 {
3126 {
3132 {
3134 DK_PERMERROR);
3136 }
3138 {
3142 else
3144 " enters scope of %q#D, which has "
3146 }
3147 }
3155 {
3182 {
3186 }
3191 }
3194 {
3200 }
3201 }
3204 }
3206 static void
3208 {
3212 }
3214 static bool
3216 {
3218 }
3220 /* Check that a new jump to a label DECL is OK. Called by
3221 finish_goto_stmt. */
3223 void
3225 {
3226 /* We can't know where a computed goto is jumping.
3227 So we assume that it's OK. */
3231 /* We didn't record any information about this label when we created it,
3232 and there's not much point since it's trivial to analyze as a return. */
3237 named_label_entry **slot
3241 /* If the label hasn't been defined yet, defer checking. */
3243 {
3244 /* Don't bother creating another use if the last goto had the
3245 same data, and will therefore create the same set of errors. */
3250 named_label_use_entry *new_use
3260 }
3264 tree bad;
3270 {
3278 }
3281 {
3285 {
3286 /* Can't skip init of __exception_info. */
3288 {
3292 }
3296 }
3298 {
3302 else
3304 " enters scope of %q#D which has "
3306 }
3307 }
3310 {
3319 }
3322 {
3325 }
3328 {
3332 {
3334 {
3339 }
3343 }
3344 }
3345 }
3347 /* Check that a return is ok wrt OpenMP structured blocks.
3348 Called by finish_return_stmt. Returns true if all is well. */
3350 bool
3352 {
3355 {
3358 }
3362 }
3364 /* Define a label, specifying the location in the source file.
3365 Return the LABEL_DECL node for the label. */
3367 static tree
3369 {
3370 /* After labels, make any new cleanups in the function go into their
3371 own new (temporary) binding contour. */
3381 {
3384 }
3385 else
3386 {
3387 /* Mark label as having been defined. */
3389 /* Say where in the source. */
3398 }
3401 }
3403 /* Wrapper for define_label_1. */
3405 tree
3407 {
3412 }
3415 struct cp_switch
3416 {
3419 /* The SWITCH_STMT being built. */
3420 tree switch_stmt;
3421 /* A splay-tree mapping the low element of a case range to the high
3422 element, or NULL_TREE if there is no high element. Used to
3423 determine whether or not a new case label duplicates an old case
3424 label. We need a tree, rather than simply a hash table, because
3425 of the GNU case range extension. */
3426 splay_tree cases;
3427 /* Remember whether there was a case value that is outside the
3428 range of the original type of the controlling expression. */
3430 };
3432 /* A stack of the currently active switch statements. The innermost
3433 switch statement is on the top of the stack. There is no need to
3434 mark the stack for garbage collection because it is only active
3435 during the processing of the body of a function, and we never
3436 collect at that point. */
3440 /* Called right after a switch-statement condition is parsed.
3441 SWITCH_STMT is the switch statement being parsed. */
3443 void
3445 {
3453 }
3455 void
3457 {
3459 location_t switch_location;
3461 /* Emit warnings as needed. */
3463 const bool bool_cond_p
3475 }
3477 /* Convert a case constant VALUE in a switch to the type TYPE of the switch
3478 condition. Note that if TYPE and VALUE are already integral we don't
3479 really do the conversion because the language-independent
3480 warning/optimization code will work better that way. */
3482 static tree
3484 {
3491 {
3494 value = (perform_implicit_conversion_flags
3497 }
3499 }
3501 /* Note that we've seen a definition of a case label, and complain if this
3502 is a bad place for one. */
3504 tree
3506 {
3509 tree type;
3512 {
3513 tree label;
3515 /* For templates, just add the case label; we'll do semantic
3516 analysis at instantiation-time. */
3519 }
3521 /* Find the condition on which this switch statement depends. */
3538 /* After labels, make any new cleanups in the function go into their
3539 own new (temporary) binding contour. */
3546 }
3547 \f
3549 tree scope;
3550 tree name;
3551 tree template_id;
3554 };
3557 {
3560 /* Hash a TYPENAME_TYPE. */
3562 static hashval_t
3564 {
3565 hashval_t hash;
3571 }
3573 /* Compare two TYPENAME_TYPEs. */
3575 static bool
3577 {
3583 }
3584 };
3586 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3587 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3589 Returns the new TYPENAME_TYPE. */
3593 tree
3596 {
3597 tree t;
3598 tree d;
3599 typename_info ti;
3601 hashval_t hash;
3616 /* See if we already have this type. */
3620 else
3621 {
3622 /* Build the TYPENAME_TYPE. */
3629 /* Build the corresponding TYPE_DECL. */
3636 /* Store it in the hash table. */
3639 /* TYPENAME_TYPEs must always be compared structurally, because
3640 they may or may not resolve down to another type depending on
3641 the currently open classes. */
3643 }
3646 }
3648 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3649 provided to name the type. Returns an appropriate type, unless an
3650 error occurs, in which case error_mark_node is returned. If we
3651 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3652 return that, rather than the _TYPE it corresponds to, in other
3653 cases we look through the type decl. If TF_ERROR is set, complain
3654 about errors, otherwise be quiet. */
3656 tree
3658 tsubst_flags_t complain)
3659 {
3660 tree fullname;
3661 tree t;
3670 {
3675 else
3676 /* Create a TEMPLATE_ID_EXPR for the type. */
3680 }
3687 {
3692 {
3696 }
3697 }
3699 {
3703 }
3708 {
3712 }
3714 /* When the CONTEXT is a dependent type, NAME could refer to a
3715 dependent base class of CONTEXT. But look inside it anyway
3716 if CONTEXT is a currently open scope, in case it refers to a
3717 member of the current instantiation or a non-dependent base;
3718 lookup will stop when we hit a dependent base. */
3720 /* We should only set WANT_TYPE when we're a nested typename type.
3721 Then we can give better diagnostics if we find a non-type. */
3723 else
3732 {
3734 {
3737 else
3740 }
3742 }
3744 /* Pull out the template from an injected-class-name (or multiple). */
3749 {
3751 {
3754 }
3756 }
3759 {
3764 }
3766 {
3771 }
3776 /* If we are currently parsing a template and if T is a typedef accessed
3777 through CONTEXT then we need to remember and check access of T at
3778 template instantiation time. */
3793 }
3795 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3796 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3797 in which case error_mark_node is returned.
3799 If PARM_LIST is non-NULL, also make sure that the template parameter
3800 list of TEMPLATE_DECL matches.
3802 If COMPLAIN zero, don't complain about any errors that occur. */
3804 tree
3806 tsubst_flags_t complain)
3807 {
3808 tree t;
3809 tree d;
3819 {
3829 {
3833 }
3837 {
3839 {
3843 }
3845 }
3848 complain))
3852 }
3854 /* Build the UNBOUND_CLASS_TEMPLATE. */
3860 /* Build the corresponding TEMPLATE_DECL. */
3869 }
3871 \f
3873 /* Push the declarations of builtin types into the global namespace.
3874 RID_INDEX is the index of the builtin type in the array
3875 RID_POINTERS. NAME is the name used when looking up the builtin
3876 type. TYPE is the _TYPE node for the builtin type.
3878 The calls to set_global_binding below should be
3879 eliminated. Built-in types should not be looked up name; their
3880 names are keywords that the parser can recognize. However, there
3881 is code in c-common.c that uses identifier_global_value to look up
3882 built-in types by name. */
3884 void
3887 tree type)
3888 {
3892 {
3898 }
3903 {
3909 }
3912 {
3916 }
3917 }
3919 /* Push a type into the namespace so that the back ends ignore it. */
3921 static void
3923 {
3926 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3933 }
3935 /* Create all the predefined identifiers. */
3937 static void
3939 {
3940 struct predefined_identifier
3941 {
3945 };
3947 /* A table of identifiers to create at startup. */
3951 /* Some of these names have a trailing space so that it is
3952 impossible for them to conflict with names written by users. */
3969 /* The demangler expects anonymous namespaces to be called
3970 something starting with '_GLOBAL__N_'. It no longer needs
3971 to be unique to the TU. */
3977 };
3981 {
3983 /* Some of these identifiers already have a special kind. */
3986 }
3987 }
3989 /* Create the predefined scalar types of C,
3990 and some nodes representing standard constants (0, 1, (void *)0).
3991 Initialize the global binding level.
3992 Make definitions for built-in primitive functions. */
3994 void
3996 {
3997 tree void_ftype;
3998 tree void_ftype_ptr;
4000 /* Create all the identifiers we need. */
4003 /* Create the global variables. */
4008 /* Enter the global namespace. */
4011 void_type_node);
4015 debug_hooks->register_main_translation_unit
4023 /* Initially, C. */
4026 /* Create the `std' namespace. */
4037 /* Guess at the initial static decls size. */
4040 /* ... and keyed classes. */
4052 NULL_TREE);
4054 #if 0
4056 #endif
4065 void_ftype_ptr
4068 /* Create the conversion operator marker. This operator's DECL_NAME
4069 is in the identifier table, so we can use identifier equality to
4070 find it. */
4072 void_ftype);
4074 /* C++ extensions */
4079 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
4082 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
4083 result. */
4090 {
4091 /* Make sure we get a unique function type, so we can give
4092 its pointer type a name. (This wins for gdb.) */
4099 }
4102 vtbl_type_node
4121 /* Now, C++. */
4126 {
4129 }
4135 {
4138 tree ptr_ftype_sizetype;
4139 tree new_eh_spec;
4141 ptr_ftype_sizetype
4144 {
4145 tree bad_alloc_id;
4146 tree bad_alloc_type_node;
4147 tree bad_alloc_decl;
4153 bad_alloc_decl
4158 new_eh_spec
4160 }
4161 else
4164 /* Ensure attribs.c is initialized. */
4167 /* Ensure constraint.cc is initialized. */
4171 NULL_TREE);
4174 extvisattr);
4188 {
4189 /* Also push the sized deallocation variants:
4190 void operator delete(void*, std::size_t) throw();
4191 void operator delete[](void*, std::size_t) throw(); */
4192 tree void_ftype_ptr_size
4196 extvisattr);
4200 }
4203 {
4210 /* operator new (size_t, align_val_t); */
4222 /* operator delete (void *, align_val_t); */
4231 {
4232 /* operator delete (void *, size_t, align_val_t); */
4235 NULL_TREE);
4240 }
4241 }
4253 }
4255 abort_fndecl
4259 /* Perform other language dependent initializations. */
4273 /* Show we use EH for cleanups. */
4276 }
4278 /* Generate an initializer for a function naming variable from
4279 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
4280 filled in with the type of the init. */
4282 tree
4284 {
4286 tree type;
4291 {
4295 }
4304 else
4308 }
4310 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
4311 the decl, LOC is the location to give the decl, NAME is the
4312 initialization string and TYPE_DEP indicates whether NAME depended
4313 on the type of the function. We make use of that to detect
4314 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
4315 at the point of first use, so we mustn't push the decl now. */
4317 static tree
4319 {
4322 tree type;
4336 {
4340 LOOKUP_ONLYCONVERTING);
4341 }
4342 else
4343 {
4346 }
4349 }
4351 static tree
4353 {
4361 /* Runtime library routines are, by definition, available in an
4362 external shared object. */
4368 /* A function in the user's namespace should have an explicit
4369 declaration before it is used. Mark the built-in function as
4370 anticipated but not actually declared. */
4374 {
4377 /* Treat __*_chk fortification functions as anticipated as well,
4378 unless they are __builtin_*. */
4383 }
4387 else
4391 }
4393 tree
4395 {
4398 /* All builtins that don't begin with an '_' should additionally
4399 go in the 'std' namespace. */
4401 {
4406 }
4409 }
4411 /* Like cxx_builtin_function, but guarantee the function is added to the global
4412 scope. This is to allow function specific options to add new machine
4413 dependent builtins when the target ISA changes via attribute((target(...)))
4414 which saves space on program startup if the program does not use non-generic
4415 ISAs. */
4417 tree
4419 {
4423 /* All builtins that don't begin with an '_' should additionally
4424 go in the 'std' namespace. */
4426 {
4431 }
4434 }
4436 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
4437 function. Not called directly. */
4439 static tree
4442 {
4450 /* Runtime library routines are, by definition, available in an
4451 external shared object. */
4456 }
4458 /* Returns the _DECL for a library function with C++ linkage. */
4460 static tree
4463 {
4468 }
4470 /* Like build_library_fn, but takes a C string instead of an
4471 IDENTIFIER_NODE. */
4473 tree
4475 {
4477 }
4479 /* Like build_cp_library_fn, but takes a C string instead of an
4480 IDENTIFIER_NODE. */
4482 tree
4484 {
4486 ecf_flags);
4487 }
4489 /* Like build_library_fn, but also pushes the function so that we will
4490 be able to find it via get_global_binding. Also, the function
4491 may throw exceptions listed in RAISES. */
4493 tree
4495 {
4496 tree fn;
4504 }
4506 /* Like build_cp_library_fn, but also pushes the function so that it
4507 will be found by normal lookup. */
4509 static tree
4512 {
4519 }
4521 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
4522 a FUNCTION_TYPE. */
4524 tree
4526 {
4529 }
4531 /* Like push_library_fn, but also note that this function throws
4532 and does not return. Used for __throw_foo and the like. */
4534 tree
4536 {
4539 }
4540 \f
4541 /* When we call finish_struct for an anonymous union, we create
4542 default copy constructors and such. But, an anonymous union
4543 shouldn't have such things; this function undoes the damage to the
4544 anonymous union type T.
4546 (The reason that we create the synthesized methods is that we don't
4547 distinguish `union { int i; }' from `typedef union { int i; } U'.
4548 The first is an anonymous union; the second is just an ordinary
4549 union type.) */
4551 void
4553 {
4554 /* Wipe out memory of synthesized methods. */
4562 /* Splice the implicitly generated functions out of TYPE_FIELDS. */
4566 else
4569 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4570 assignment operators (because they cannot have these methods themselves).
4571 For anonymous unions this is already checked because they are not allowed
4572 in any union, otherwise we have to check it. */
4574 {
4579 {
4582 {
4592 }
4593 }
4594 }
4595 }
4597 /* Warn for an attribute located at LOCATION that appertains to the
4598 class type CLASS_TYPE that has not been properly placed after its
4599 class-key, in it class-specifier. */
4601 void
4603 tree class_type)
4604 {
4608 "attribute ignored in declaration "
4613 }
4615 /* Make sure that a declaration with no declarator is well-formed, i.e.
4616 just declares a tagged type or anonymous union.
4618 Returns the type declared; or NULL_TREE if none. */
4620 tree
4623 {
4626 /* If a class, struct, or enum type is declared by the DECLSPECS
4627 (i.e, if a class-specifier, enum-specifier, or non-typename
4628 elaborated-type-specifier appears in the DECLSPECS),
4629 DECLARED_TYPE is set to the corresponding type. */
4636 {
4642 }
4655 {
4657 "%<auto%> can only be specified for variables "
4660 }
4661 /* Check for an anonymous union. */
4664 {
4665 /* 7/3 In a simple-declaration, the optional init-declarator-list
4666 can be omitted only when declaring a class (clause 9) or
4667 enumeration (7.2), that is, when the decl-specifier-seq contains
4668 either a class-specifier, an elaborated-type-specifier with
4669 a class-key (9.1), or an enum-specifier. In these cases and
4670 whenever a class-specifier or enum-specifier is present in the
4671 decl-specifier-seq, the identifiers in these specifiers are among
4672 the names being declared by the declaration (as class-name,
4673 enum-names, or enumerators, depending on the syntax). In such
4674 cases, and except for the declaration of an unnamed bit-field (9.6),
4675 the decl-specifier-seq shall introduce one or more names into the
4676 program, or shall redeclare a name introduced by a previous
4677 declaration. [Example:
4678 enum { }; // ill-formed
4679 typedef class { }; // ill-formed
4680 --end example] */
4682 {
4685 }
4692 }
4694 else
4695 {
4703 && (!current_class_type
4712 "a storage class can only be specified for objects "
4716 "%<const%> can only be specified for objects and "
4720 "%<volatile%> can only be specified for objects and "
4724 "%<__restrict%> can only be specified for objects and "
4728 "%<__thread%> can only be specified for objects "
4736 }
4739 {
4740 location_t loc;
4743 /* For a non-template class, use the name location. */
4745 else
4746 /* For a template class (an explicit instantiation), use the
4747 current location. */
4751 /* [dcl.attr.grammar]/4:
4753 No attribute-specifier-seq shall appertain to an explicit
4754 instantiation. */
4755 {
4758 declared_type))
4760 "no attribute can be applied to "
4762 }
4763 else
4765 }
4768 }
4770 /* Called when a declaration is seen that contains no names to declare.
4771 If its type is a reference to a structure, union or enum inherited
4772 from a containing scope, shadow that tag name for the current scope
4773 with a forward reference.
4774 If its type defines a new named structure or union
4775 or defines an enum, it is valid but we need not do anything here.
4776 Otherwise, it is an error.
4778 C++: may have to grok the declspecs to learn about static,
4779 complain for anonymous unions.
4781 Returns the TYPE declared -- or NULL_TREE if none. */
4783 tree
4785 {
4795 /* This is where the variables in an anonymous union are
4796 declared. An anonymous union declaration looks like:
4797 union { ... } ;
4798 because there is no declarator after the union, the parser
4799 sends that declaration here. */
4801 {
4805 {
4809 }
4810 }
4813 }
4814 \f
4815 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4817 tree
4821 {
4822 tree attrs;
4823 tree type;
4824 enum decl_context context
4830 {
4835 /* A template type parameter or other dependent type. */
4838 else
4840 }
4842 }
4844 /* Process a DECLARATOR for a function-scope variable declaration,
4845 namespace-scope variable declaration, or function declaration.
4846 (Function definitions go through start_function; class member
4847 declarations appearing in the body of the class go through
4848 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4849 If an error occurs, the error_mark_node is returned instead.
4851 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4852 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4853 for an explicitly defaulted function, or SD_DELETED for an explicitly
4854 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4855 implicitly initialized via a default constructor. ATTRIBUTES and
4856 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4858 The scope represented by the context of the returned DECL is pushed
4859 (if it is not the global namespace) and is assigned to
4860 *PUSHED_SCOPE_P. The caller is then responsible for calling
4861 pop_scope on *PUSHED_SCOPE_P if it is set. */
4863 tree
4867 tree attributes,
4868 tree prefix_attributes,
4870 {
4871 tree decl;
4872 tree context;
4879 /* An object declared as __attribute__((deprecated)) suppresses
4880 warnings of uses of other deprecated items. */
4899 /* Is it valid for this decl to have an initializer at all?
4900 If not, set INITIALIZED to zero, which will indirectly
4901 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4904 {
4907 }
4910 {
4914 decl);
4918 }
4924 /* If this is a typedef that names the class for linkage purposes
4925 (7.1.3p8), apply any attributes directly to the type. */
4930 else
4933 /* Set attributes here so if duplicate decl, will have proper attributes. */
4936 /* Dllimported symbols cannot be defined. Static data members (which
4937 can be initialized in-class and dllimported) go through grokfield,
4938 not here, so we don't need to exclude those decls when checking for
4939 a definition. */
4941 {
4944 }
4946 /* If #pragma weak was used, mark the decl weak now. */
4958 {
4962 {
4968 {
4972 else
4973 {
4979 }
4980 }
4981 else
4982 {
4987 {
4994 }
4995 /* Static data member are tricky; an in-class initialization
4996 still doesn't provide a definition, so the in-class
4997 declaration will have DECL_EXTERNAL set, but will have an
4998 initialization. Thus, duplicate_decls won't warn
4999 about this situation, and so we check here. */
5008 }
5009 }
5010 else
5011 {
5013 this_tmpl
5014 ? current_template_parms
5020 }
5022 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
5024 /* Do not mark DECL as an explicit specialization if it was not
5025 already marked as an instantiation; a declaration should
5026 never be marked as a specialization unless we know what
5027 template is being specialized. */
5029 {
5034 else
5037 /* [temp.expl.spec] An explicit specialization of a static data
5038 member of a template is a definition if the declaration
5039 includes an initializer; otherwise, it is a declaration.
5041 We check for processing_specialization so this only applies
5042 to the new specialization syntax. */
5045 }
5048 /* Aliases are definitions. */
5051 decl);
5052 }
5056 /* Enter this declaration into the symbol table. Don't push the plain
5057 VAR_DECL for a variable template. */
5070 {
5071 /* This is a const variable with implicit 'static'. Set
5072 DECL_THIS_STATIC so we can tell it from variables that are
5073 !TREE_PUBLIC because of the anonymous namespace. */
5076 }
5080 {
5084 decl);
5087 else
5091 }
5097 }
5099 /* Process the declaration of a variable DECL. INITIALIZED is true
5100 iff DECL is explicitly initialized. (INITIALIZED is false if the
5101 variable is initialized via an implicitly-called constructor.)
5102 This function must be called for ordinary variables (including, for
5103 example, implicit instantiations of templates), but must not be
5104 called for template declarations. */
5106 void
5108 {
5109 tree type;
5124 /* If an explicit initializer is present, or if this is a definition
5125 of an aggregate, then we need a complete type at this point.
5126 (Scalars are always complete types, so there is nothing to
5127 check.) This code just sets COMPLETE_P; errors (if necessary)
5128 are issued below. */
5130 && !complete_p
5132 {
5134 /* We will not yet have set TREE_READONLY on DECL if the type
5135 was "const", but incomplete, before this point. But, now, we
5136 have a complete type, so we can try again. */
5138 }
5141 /* Is it valid for this decl to have an initializer at all? */
5142 {
5143 /* Don't allow initializations for incomplete types except for
5144 arrays which might be completed by the initialization. */
5150 {
5153 }
5155 {
5158 /* else we already gave an error in start_decl. */
5159 }
5160 }
5162 {
5165 else
5166 {
5168 decl);
5169 /* Change the type so that assemble_variable will give
5170 DECL an rtl we can live with: (mem (const_int 0)). */
5172 }
5173 }
5175 /* Create a new scope to hold this declaration if necessary.
5176 Whether or not a new scope is necessary cannot be determined
5177 until after the type has been completed; if the type is a
5178 specialization of a class template it is not until after
5179 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
5180 will be set correctly. */
5182 }
5184 /* Handle initialization of references. DECL, TYPE, and INIT have the
5185 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
5186 but will be set to a new CLEANUP_STMT if a temporary is created
5187 that must be destroyed subsequently.
5189 Returns an initializer expression to use to initialize DECL, or
5190 NULL if the initialization can be performed statically.
5192 Quotes on semantics can be found in ARM 8.4.3. */
5194 static tree
5196 {
5198 {
5204 }
5208 tf_warning_or_error);
5213 /* Note: default conversion is only called in very special cases. */
5216 /* check_initializer handles this for non-reference variables, but for
5217 references we need to do it here or the initializer will get the
5218 incomplete array type and confuse later calls to
5219 cp_complete_array_type. */
5224 {
5228 }
5230 /* Convert INIT to the reference type TYPE. This may involve the
5231 creation of a temporary, whose lifetime must be the same as that
5232 of the reference. If so, a DECL_EXPR for the temporary will be
5233 added just after the DECL_EXPR for DECL. That's why we don't set
5234 DECL_INITIAL for local references (instead assigning to them
5235 explicitly); we need to allow the temporary to be initialized
5236 first. */
5238 tf_warning_or_error);
5239 }
5241 /* Designated initializers in arrays are not supported in GNU C++.
5242 The parser cannot detect this error since it does not know whether
5243 a given brace-enclosed initializer is for a class type or for an
5244 array. This function checks that CE does not use a designated
5245 initializer. If it does, an error is issued. Returns true if CE
5246 is valid, i.e., does not have a designated initializer. */
5248 static bool
5251 {
5252 /* Designated initializers for array elements are not supported. */
5254 {
5255 /* The parser only allows identifiers as designated
5256 initializers. */
5258 {
5262 }
5264 {
5268 }
5276 {
5277 /* A C99 designator is OK if it matches the current index. */
5280 else
5282 }
5283 else
5288 }
5291 }
5293 /* When parsing `int a[] = {1, 2};' we don't know the size of the
5294 array until we finish parsing the initializer. If that's the
5295 situation we're in, update DECL accordingly. */
5297 static void
5299 {
5305 {
5306 /* do_default is really a C-ism to deal with tentative definitions.
5307 But let's leave it here to ease the eventual merge. */
5312 /* Check that there are no designated initializers in INIT, as
5313 those are not supported in GNU C++, and as the middle-end
5314 will crash if presented with a non-numeric designated
5315 initializer. */
5317 {
5320 HOST_WIDE_INT i;
5324 }
5327 {
5329 do_default);
5331 {
5335 }
5337 {
5339 {
5342 }
5343 /* If a `static' var's size isn't known, make it extern as
5344 well as static, so it does not get allocated. If it's not
5345 `static', then don't mark it extern; finish_incomplete_decl
5346 will give it a default size and it will get allocated. */
5349 }
5351 {
5354 }
5355 }
5360 }
5361 }
5363 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
5364 any appropriate error messages regarding the layout. */
5366 static void
5368 {
5369 tree type;
5375 /* If we haven't already laid out this declaration, do so now.
5376 Note that we must not call complete type for an external object
5377 because it's type might involve templates that we are not
5378 supposed to instantiate yet. (And it's perfectly valid to say
5379 `extern X x' for some incomplete type `X'.) */
5388 {
5389 /* An automatic variable with an incomplete type: that is an error.
5390 Don't talk about array types here, since we took care of that
5391 message in grokdeclarator. */
5395 }
5396 #if 0
5397 /* Keep this code around in case we later want to control debug info
5398 based on whether a type is "used". (jason 1999-11-11) */
5401 /* Let debugger know it should output info for this type. */
5406 #endif
5411 {
5414 else
5415 {
5419 }
5420 }
5421 }
5423 /* If a local static variable is declared in an inline function, or if
5424 we have a weak definition, we must endeavor to create only one
5425 instance of the variable at link-time. */
5427 void
5429 {
5430 /* Static data in a function with comdat linkage also has comdat
5431 linkage. */
5433 /* Don't mess with __FUNCTION__. */
5438 {
5440 {
5441 /* With weak symbols, we simply make the variable COMDAT;
5442 that will cause copies in multiple translations units to
5443 be merged. */
5445 }
5446 else
5447 {
5450 {
5451 /* Without weak symbols, we can use COMMON to merge
5452 uninitialized variables. */
5455 }
5456 else
5457 {
5458 /* While for initialized variables, we must use internal
5459 linkage -- which means that multiple copies will not
5460 be merged. */
5466 "%q#D are wrong (you%'ll wind up with "
5468 else
5470 "static data %q#D are wrong (you%'ll wind "
5476 }
5477 }
5478 }
5479 }
5481 /* Issue an error message if DECL is an uninitialized const variable. */
5483 static void
5485 {
5488 /* ``Unless explicitly declared extern, a const object does not have
5489 external linkage and must be initialized. ($8.4; $12.1)'' ARM
5490 7.1.6 */
5495 {
5503 else
5504 {
5508 decl);
5510 }
5513 {
5514 tree defaulted_ctor;
5521 "constructor is not user-provided because it is "
5524 "and the implicitly-defined constructor does not "
5526 }
5527 }
5528 }
5529 \f
5530 /* Structure holding the current initializer being processed by reshape_init.
5531 CUR is a pointer to the current element being processed, END is a pointer
5532 after the last element present in the initializer. */
5533 struct reshape_iter
5534 {
5537 };
5541 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
5542 returned is the next FIELD_DECL (possibly FIELD itself) that can be
5543 initialized. If there are no more such fields, the return value
5544 will be NULL. */
5546 tree
5548 {
5557 }
5559 /* Return true for [dcl.init.list] direct-list-initialization from
5560 single element of enumeration with a fixed underlying type. */
5562 bool
5564 {
5573 }
5575 /* Subroutine of reshape_init_array and reshape_init_vector, which does
5576 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
5577 INTEGER_CST representing the size of the array minus one (the maximum index),
5578 or NULL_TREE if the array was declared without specifying the size. D is
5579 the iterator within the constructor. */
5581 static tree
5583 tsubst_flags_t complain)
5584 {
5585 tree new_init;
5590 /* The initializer for an array is always a CONSTRUCTOR. */
5594 {
5595 /* Minus 1 is used for zero sized arrays. */
5601 /* sizetype is sign extended, not zero extended. */
5602 else
5604 }
5606 /* Loop until there are no more initializers. */
5610 {
5611 tree elt_init;
5616 complain);
5624 /* This can happen with an invalid initializer (c++/54501). */
5627 }
5630 }
5632 /* Subroutine of reshape_init_r, processes the initializers for arrays.
5633 Parameters are the same of reshape_init_r. */
5635 static tree
5637 {
5646 }
5648 /* Subroutine of reshape_init_r, processes the initializers for vectors.
5649 Parameters are the same of reshape_init_r. */
5651 static tree
5653 {
5659 {
5662 {
5667 }
5670 }
5672 /* For a vector, we initialize it as an array of the appropriate size. */
5677 }
5679 /* Subroutine of reshape_init_r, processes the initializers for classes
5680 or union. Parameters are the same of reshape_init_r. */
5682 static tree
5684 tsubst_flags_t complain)
5685 {
5686 tree field;
5687 tree new_init;
5691 /* The initializer for a class is always a CONSTRUCTOR. */
5696 {
5697 /* [dcl.init.aggr]
5699 An initializer for an aggregate member that is an
5700 empty class shall have the form of an empty
5701 initializer-list {}. */
5703 {
5707 }
5709 }
5711 /* Loop through the initializable fields, gathering initializers. */
5713 {
5714 tree field_init;
5717 /* Handle designated initializers, as an extension. */
5719 {
5724 /* We already reshaped this. */
5728 else
5729 {
5734 }
5737 {
5742 }
5743 }
5745 /* If we processed all the member of the class, we are done. */
5755 {
5756 /* This can happen with an invalid initializer for a flexible
5757 array member (c++/54441). */
5761 }
5765 /* [dcl.init.aggr]
5767 When a union is initialized with a brace-enclosed
5768 initializer, the braces shall only contain an
5769 initializer for the first member of the union. */
5774 }
5777 }
5779 /* Subroutine of reshape_init_r. We're in a context where C99 initializer
5780 designators are not valid; either complain or return true to indicate
5781 that reshape_init_r should return error_mark_node. */
5783 static bool
5785 {
5787 {
5791 else
5793 }
5795 }
5797 /* Subroutine of reshape_init, which processes a single initializer (part of
5798 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5799 iterator within the CONSTRUCTOR which points to the initializer to process.
5800 FIRST_INITIALIZER_P is true if this is the first initializer of the
5801 outermost CONSTRUCTOR node. */
5803 static tree
5805 tsubst_flags_t complain)
5806 {
5817 {
5818 /* A complex type can be initialized from one or two initializers,
5819 but braces are not elided. */
5822 {
5824 {
5827 else
5829 }
5830 }
5832 {
5840 }
5842 }
5844 /* A non-aggregate type is always initialized with a single
5845 initializer. */
5847 {
5848 /* It is invalid to initialize a non-aggregate type with a
5849 brace-enclosed initializer before C++0x.
5850 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
5851 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
5852 a CONSTRUCTOR (with a record type). */
5854 /* Don't complain about a capture-init. */
5857 {
5859 {
5861 /* Isn't value-initialization. */
5863 {
5866 type);
5868 }
5869 }
5870 else
5872 }
5876 }
5878 /* "If T is a class type and the initializer list has a single element of
5879 type cv U, where U is T or a class derived from T, the object is
5880 initialized from that element." Even if T is an aggregate. */
5882 && first_initializer_p
5885 {
5888 }
5890 /* [dcl.init.aggr]
5892 All implicit type conversions (clause _conv_) are considered when
5893 initializing the aggregate member with an initializer from an
5894 initializer-list. If the initializer can initialize a member,
5895 the member is initialized. Otherwise, if the member is itself a
5896 non-empty subaggregate, brace elision is assumed and the
5897 initializer is considered for the initialization of the first
5898 member of the subaggregate. */
5900 /* But don't try this for the first initializer, since that would be
5901 looking through the outermost braces; A a2 = { a1 }; is not a
5902 valid aggregate initialization. */
5903 && !first_initializer_p
5906 complain)))
5907 {
5910 }
5912 /* [dcl.init.string]
5914 A char array (whether plain char, signed char, or unsigned char)
5915 can be initialized by a string-literal (optionally enclosed in
5916 braces); a wchar_t array can be initialized by a wide
5917 string-literal (optionally enclosed in braces). */
5920 {
5923 /* Strip one level of braces if and only if they enclose a single
5924 element (as allowed by [dcl.init.string]). */
5928 {
5930 }
5932 /* If it's a string literal, then it's the initializer for the array
5933 as a whole. Otherwise, continue with normal initialization for
5934 array types (one value per array element). */
5936 {
5941 }
5942 }
5944 /* The following cases are about aggregates. If we are not within a full
5945 initializer already, and there is not a CONSTRUCTOR, it means that there
5946 is a missing set of braces (that is, we are processing the case for
5947 which reshape_init exists). */
5949 {
5951 {
5953 /* There is no need to reshape pointer-to-member function
5954 initializers, as they are always constructed correctly
5955 by the front end. */
5956 ;
5958 /* For a nested compound literal, there is no need to reshape since
5959 brace elision is not allowed. Even if we decided to allow it,
5960 we should add a call to reshape_init in finish_compound_literal,
5961 before calling digest_init, so changing this code would still
5962 not be necessary. */
5964 else
5965 {
5969 }
5970 }
5975 type);
5976 }
5978 /* Dispatch to specialized routines. */
5985 else
5987 }
5989 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
5990 brace-enclosed aggregate initializer.
5992 INIT is the CONSTRUCTOR containing the list of initializers describing
5993 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
5994 It may not presently match the shape of the TYPE; for example:
5996 struct S { int a; int b; };
5997 struct S a[] = { 1, 2, 3, 4 };
5999 Here INIT will hold a vector of four elements, rather than a
6000 vector of two elements, each itself a vector of two elements. This
6001 routine transforms INIT from the former form into the latter. The
6002 revised CONSTRUCTOR node is returned. */
6004 tree
6006 {
6008 reshape_iter d;
6009 tree new_init;
6015 /* An empty constructor does not need reshaping, and it is always a valid
6016 initializer. */
6020 /* Handle [dcl.init.list] direct-list-initialization from
6021 single element of enumeration with a fixed underlying type. */
6023 {
6027 {
6030 }
6031 else
6033 }
6035 /* Recurse on this CONSTRUCTOR. */
6043 /* Make sure all the element of the constructor were used. Otherwise,
6044 issue an error about exceeding initializers. */
6046 {
6050 }
6057 }
6059 /* Verify array initializer. Returns true if errors have been reported. */
6061 bool
6063 {
6066 /* The array type itself need not be complete, because the
6067 initializer may tell us how many elements are in the array.
6068 But, the elements of the array must be complete. */
6070 {
6074 else
6077 }
6078 /* A compound literal can't have variable size. */
6082 {
6085 }
6087 }
6089 /* Subroutine of check_initializer; args are passed down from that function.
6090 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
6092 static tree
6095 {
6098 }
6100 /* Verify INIT (the initializer for DECL), and record the
6101 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
6102 grok_reference_init.
6104 If the return value is non-NULL, it is an expression that must be
6105 evaluated dynamically to initialize DECL. */
6107 static tree
6109 {
6112 tree core_type;
6114 /* Things that are going to be initialized need to have complete
6115 type. */
6119 {
6120 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
6121 it doesn't have storage to be initialized. */
6124 }
6127 /* We will have already complained. */
6131 {
6134 }
6136 {
6141 }
6142 else
6143 /* There is no way to make a variable-sized class type in GNU C++. */
6147 {
6150 {
6152 {
6155 }
6157 {
6159 "scalar object %qD requires one element in "
6163 }
6164 }
6165 }
6168 {
6175 }
6177 ;
6180 {
6182 {
6185 }
6188 /* Do not reshape constructors of vectors (they don't need to be
6189 reshaped. */
6191 {
6193 {
6195 tf_warning_or_error);
6197 }
6199 {
6200 /* Don't reshape if the class has constructors. */
6203 "in C++98 %qD must be initialized by "
6205 decl);
6206 }
6208 {
6211 }
6212 else
6213 {
6216 }
6217 }
6221 {
6224 /* We get here with code like `int a (2);' */
6226 tf_warning_or_error);
6227 }
6229 /* If DECL has an array type without a specific bound, deduce the
6230 array size from the initializer. */
6244 {
6247 /* A constructor call is a non-trivial initializer even if
6248 it isn't explicitly written. */
6252 /* If this is a constexpr initializer, expand_default_init will
6253 have returned an INIT_EXPR rather than a CALL_EXPR. In that
6254 case, pull the initializer back out and pass it down into
6255 store_init_value. */
6260 {
6263 /* Don't call digest_init; it's unnecessary and will complain
6264 about aggregate initialization of non-aggregate classes. */
6266 }
6268 {
6269 /* Declared constexpr, but no suitable initializer; massage
6270 init appropriately so we can pass it into store_init_value
6271 for the error. */
6274 {
6278 }
6280 }
6281 else
6283 }
6286 {
6287 /* In aggregate initialization of a variable, each element
6288 initialization is a full-expression because there is no
6289 enclosing expression. */
6304 }
6305 }
6306 else
6307 {
6315 }
6321 {
6322 /* We might have set these in cp_finish_decl. */
6325 }
6329 {
6337 else
6341 {
6345 }
6347 }
6350 }
6352 /* If DECL is not a local variable, give it RTL. */
6354 static void
6356 {
6360 /* Set the DECL_ASSEMBLER_NAME for the object. */
6362 {
6363 /* The `register' keyword, when used together with an
6364 asm-specification, indicates that the variable should be
6365 placed in a particular register. */
6367 {
6370 }
6371 else
6372 {
6377 }
6378 }
6380 /* Handle non-variables up front. */
6382 {
6385 }
6387 /* If we see a class member here, it should be a static data
6388 member. */
6390 {
6392 /* An in-class declaration of a static data member should be
6393 external; it is only a declaration, and not a definition. */
6398 }
6400 /* We don't create any RTL for local variables. */
6404 /* We defer emission of local statics until the corresponding
6405 DECL_EXPR is expanded. But with constexpr its function might never
6406 be expanded, so go ahead and tell cgraph about the variable now. */
6411 /* Defer template instantiations. */
6416 /* If we're not deferring, go ahead and assemble the variable. */
6419 }
6421 /* walk_tree helper for wrap_temporary_cleanups, below. */
6423 static tree
6425 {
6426 /* Stop at types or full-expression boundaries. */
6429 {
6432 }
6435 {
6440 /* Tell honor_protect_cleanup_actions to handle this as a separate
6441 cleanup. */
6445 }
6448 }
6450 /* We're initializing a local variable which has a cleanup GUARD. If there
6451 are any temporaries used in the initializer INIT of this variable, we
6452 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
6453 variable will be cleaned up properly if one of them throws.
6455 Unfortunately, there's no way to express this properly in terms of
6456 nesting, as the regions for the temporaries overlap the region for the
6457 variable itself; if there are two temporaries, the variable needs to be
6458 the first thing destroyed if either of them throws. However, we only
6459 want to run the variable's cleanup if it actually got constructed. So
6460 we need to guard the temporary cleanups with the variable's cleanup if
6461 they are run on the normal path, but not if they are run on the
6462 exceptional path. We implement this by telling
6463 honor_protect_cleanup_actions to strip the variable cleanup from the
6464 exceptional path. */
6466 static void
6468 {
6470 }
6472 /* Generate code to initialize DECL (a local variable). */
6474 static void
6476 {
6478 tree cleanup;
6486 {
6487 /* If we used it already as memory, it must stay in memory. */
6491 }
6496 /* Compute and store the initial value. */
6501 /* Generate a cleanup, if necessary. */
6504 /* Perform the initialization. */
6506 {
6510 {
6511 /* Stick simple initializers in DECL_INITIAL so that
6512 -Wno-init-self works (c++/34772). */
6517 {
6521 OPT_Winit_self,
6523 }
6524 }
6525 else
6526 {
6529 /* If we're only initializing a single object, guard the
6530 destructors of any temporaries used in its initializer with
6531 its destructor. This isn't right for arrays because each
6532 element initialization is a full-expression. */
6541 saved_stmts_are_full_exprs_p;
6542 }
6543 }
6545 /* Set this to 0 so we can tell whether an aggregate which was
6546 initialized was ever used. Don't do this if it has a
6547 destructor, so we don't complain about the 'resource
6548 allocation is initialization' idiom. Now set
6549 attribute((unused)) on types so decls of that type will be
6550 marked used. (see TREE_USED, above.) */
6552 && ! already_used
6561 }
6563 /* DECL is a VAR_DECL for a compiler-generated variable with static
6564 storage duration (like a virtual table) whose initializer is a
6565 compile-time constant. Initialize the variable and provide it to the
6566 back end. */
6568 void
6570 {
6571 tree init;
6581 }
6583 /* INIT is the initializer for a variable, as represented by the
6584 parser. Returns true iff INIT is type-dependent. */
6586 static bool
6588 {
6590 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
6593 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
6594 {
6607 }
6608 else
6609 /* It must be a simple expression, e.g., int i = 3; */
6613 }
6615 /* INIT is the initializer for a variable, as represented by the
6616 parser. Returns true iff INIT is value-dependent. */
6618 static bool
6620 {
6622 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
6625 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
6626 {
6636 }
6637 else
6638 /* It must be a simple expression, e.g., int i = 3; */
6642 }
6644 // Returns true if a DECL is VAR_DECL with the concept specifier.
6647 {
6649 // Not all variables have DECL_LANG_SPECIFIC.
6652 }
6654 /* A helper function to be called via walk_tree. If any label exists
6655 under *TP, it is (going to be) forced. Set has_forced_label_in_static. */
6657 static tree
6659 {
6665 }
6667 /* Finish processing of a declaration;
6668 install its line number and initial value.
6669 If the length of an array type is not known before,
6670 it must be determined now, from the initial value, or it is an error.
6672 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
6673 true, then INIT is an integral constant expression.
6675 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
6676 if the (init) syntax was used. */
6678 void
6681 {
6682 tree type;
6687 tree auto_node;
6692 {
6696 }
6699 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
6706 /* Warn about register storage specifiers except when in GNU global
6707 or local register variable extension. */
6709 {
6712 "ISO C++17 does not allow %<register%> storage "
6714 else
6717 }
6719 /* If a name was specified, get the string. */
6734 {
6735 tree d_init;
6737 {
6741 {
6742 /* init is null because we're deferring instantiating the
6743 initializer until we need it. Well, we need it now. */
6746 }
6749 }
6752 {
6756 tf_warning_or_error);
6758 }
6768 {
6773 }
6775 }
6786 {
6787 tree clone;
6789 {
6790 /* FIXME check this is 1st decl. */
6795 {
6799 }
6801 }
6803 {
6806 else
6808 }
6809 }
6812 {
6814 /* If DECL is a reference, then we want to know whether init is a
6815 reference constant; init_const_expr_p as passed tells us whether
6816 it's an rvalue constant. */
6820 {
6821 /* Set these flags now for templates. We'll update the flags in
6822 store_init_value for instantiations. */
6825 /* FIXME setting TREE_CONSTANT on refs breaks the back end. */
6828 }
6829 }
6832 {
6835 /* Add this declaration to the statement-tree. */
6842 {
6845 }
6849 /* Generally, initializers in templates are expanded when the
6850 template is instantiated. But, if DECL is a variable constant
6851 then it can be used in future constant expressions, so its value
6852 must be available. */
6857 && init_const_expr_p
6862 {
6863 /* This variable seems to be a non-dependent constant, so process
6864 its initializer. If check_initializer returns non-null the
6865 initialization wasn't constant after all. */
6866 tree init_code;
6872 }
6876 {
6877 /* Deduce array size even if the initializer is dependent. */
6879 /* And complain about multiple initializers. */
6883 tf_warning_or_error);
6884 }
6889 }
6891 /* Just store non-static data member initializers for later. */
6895 /* Take care of TYPE_DECLs up front. */
6897 {
6900 {
6904 }
6906 /* If we have installed this as the canonical typedef for this
6907 type, and that type has not been defined yet, delay emitting
6908 the debug information for it, as we will emit it later. */
6914 at_eof);
6916 }
6918 /* A reference will be modified here, as it is initialized. */
6922 {
6925 }
6928 {
6929 /* If this is a local variable that will need a mangled name,
6930 register it now. We must do this before processing the
6931 initializer for the variable, since the initialization might
6932 require a guard variable, and since the mangled name of the
6933 guard variable will depend on the mangled name of this
6934 variable. */
6938 {
6940 /* Normally has_forced_label_in_static is set during GIMPLE
6941 lowering, but [cd]tors are never actually compiled directly.
6942 We need to set this early so we can deal with the label
6943 address extension. */
6947 {
6950 }
6951 /* And make sure it's in the symbol table for
6952 c_parse_final_cleanups to find. */
6954 }
6956 /* Convert the initializer to the type of DECL, if we have not
6957 already initialized DECL. */
6959 /* If !DECL_EXTERNAL then DECL is being defined. In the
6960 case of a static data member initialized inside the
6961 class-specifier, there can be an initializer even if DECL
6962 is *not* defined. */
6964 {
6968 /* Handle:
6970 [dcl.init]
6972 The memory occupied by any object of static storage
6973 duration is zero-initialized at program startup before
6974 any other initialization takes place.
6976 We cannot create an appropriate initializer until after
6977 the type of DECL is finalized. If DECL_INITIAL is set,
6978 then the DECL is statically initialized, and any
6979 necessary zero-initialization has already been performed. */
6984 /* Remember that the initialization for this variable has
6985 taken place. */
6987 /* This declaration is the definition of this variable,
6988 unless we are initializing a static data member within
6989 the class specifier. */
6992 }
6993 /* If the variable has an array type, lay out the type, even if
6994 there is no initializer. It is valid to index through the
6995 array, and we must get TYPE_ALIGN set correctly on the array
6996 type. */
7003 /* So decl is a global variable or a static member of a
7004 non local class. Record the types it uses
7005 so that we can decide later to emit debug info for them. */
7007 }
7009 /* Add this declaration to the statement-tree. This needs to happen
7010 after the call to check_initializer so that the DECL_EXPR for a
7011 reference temp is added before the DECL_EXPR for the reference itself. */
7013 {
7014 /* If we're building a variable sized type, and we might be
7015 reachable other than via the top of the current binding
7016 level, then create a new BIND_EXPR so that we deallocate
7017 the object at the right time. */
7022 {
7023 tree bind;
7028 }
7030 }
7032 /* Let the middle end know about variables and functions -- but not
7033 static data members in uninstantiated class templates. */
7035 {
7037 {
7040 }
7042 /* This needs to happen after the linkage is set. */
7046 {
7047 /* If a TREE_READONLY variable needs initialization
7048 at runtime, it is no longer readonly and we need to
7049 avoid MEM_READONLY_P being set on RTL created for it. */
7051 {
7055 }
7059 /* Likewise if it needs destruction. */
7062 }
7066 /* Check for abstractness of the type. Notice that there is no
7067 need to strip array types here since the check for those types
7068 is already done within create_array_type_for_decl. */
7072 /* No initialization required. */
7073 ;
7075 {
7077 {
7079 {
7080 /* An out-of-class default definition is defined at
7081 the point where it is explicitly defaulted. */
7086 }
7087 else
7089 }
7090 /* else no initialization required. */
7091 }
7095 {
7098 }
7099 /* A variable definition. */
7101 /* Initialize the local variable. */
7104 /* If a variable is defined, and then a subsequent
7105 definition with external linkage is encountered, we will
7106 get here twice for the same variable. We want to avoid
7107 calling expand_static_init more than once. For variables
7108 that are not static data members, we can call
7109 expand_static_init only when we actually process the
7110 initializer. It is not legal to redeclare a static data
7111 member, so this issue does not arise in that case. */
7114 }
7116 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
7117 reference, insert it in the statement-tree now. */
7119 {
7124 }
7130 }
7132 /* For class TYPE return itself or some its bases that contain
7133 any direct non-static data members. Return error_mark_node if an
7134 error has been diagnosed. */
7136 static tree
7138 {
7146 {
7150 else
7155 }
7157 {
7165 }
7166 else
7176 {
7181 {
7183 {
7188 }
7192 /* OK, found the same base along another path. We'll complain
7195 {
7197 "classes %qT and %qT have non-static data "
7200 }
7201 else
7203 }
7204 }
7206 }
7208 /* Return std::tuple_size<TYPE>::value. */
7210 static tree
7212 {
7228 else
7230 }
7232 /* Return std::tuple_element<I,TYPE>::type. */
7234 static tree
7236 {
7244 tf_warning_or_error);
7247 }
7249 /* Return e.get<i>() or get<i>(e). */
7251 static tree
7253 {
7261 /* [The id-expression] e is an lvalue if the type of the entity e is an
7262 lvalue reference and an xvalue otherwise. */
7270 {
7275 }
7276 else
7277 {
7283 }
7284 }
7286 /* It's impossible to recover the decltype of a tuple decomposition variable
7287 based on the actual type of the variable, so store it in a hash table. */
7289 static void
7291 {
7295 }
7297 tree
7299 {
7301 }
7303 /* Finish a decomposition declaration. DECL is the underlying declaration
7304 "e", FIRST is the head of a chain of decls for the individual identifiers
7305 chained through DECL_CHAIN in reverse order and COUNT is the number of
7306 those decls. */
7308 void
7310 {
7312 {
7313 error_out:
7315 {
7318 {
7321 }
7323 }
7327 }
7331 /* This happens for range for when not in templates.
7332 Still add the DECL_VALUE_EXPRs for later processing. */
7333 || (!processing_template_decl
7335 {
7337 {
7339 {
7345 }
7349 }
7351 }
7357 {
7360 }
7366 {
7369 }
7374 {
7375 tree nelts;
7380 {
7383 }
7386 {
7387 cnt_mismatch:
7391 else
7395 }
7398 {
7406 NULL_TREE);
7409 }
7410 }
7411 /* 2 GNU extensions. */
7413 {
7419 {
7427 t);
7430 }
7431 }
7433 {
7439 {
7449 NULL_TREE);
7452 }
7453 }
7455 {
7457 {
7461 }
7467 {
7478 {
7482 }
7483 /* Save the decltype away before reference collapse. */
7489 {
7490 /* In this case the names are variables, not just proxies. */
7493 }
7497 }
7498 /* Ignore reads from the underlying decl performed during initialization
7499 of the individual variables. If those will be read, we'll mark
7500 the underlying decl as read at that point. */
7502 }
7504 {
7507 }
7509 {
7512 }
7514 {
7517 }
7518 else
7519 {
7524 {
7528 }
7532 else
7533 eltscnt++;
7538 {
7542 }
7547 else
7548 {
7550 NULL_TREE);
7556 {
7559 }
7560 i++;
7561 }
7562 }
7564 {
7567 {
7572 }
7573 }
7576 }
7578 /* Returns a declaration for a VAR_DECL as if:
7580 extern "C" TYPE NAME;
7582 had been seen. Used to create compiler-generated global
7583 variables. */
7585 static tree
7587 {
7588 tree decl;
7596 /* If the user has explicitly declared this variable (perhaps
7597 because the code we are compiling is part of a low-level runtime
7598 library), then it is possible that our declaration will be merged
7599 with theirs by pushdecl. */
7605 }
7607 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
7608 if "__cxa_atexit" is not being used) corresponding to the function
7609 to be called when the program exits. */
7611 static tree
7613 {
7614 tree fn_type;
7617 {
7618 tree arg_type;
7621 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
7623 else
7624 /* The parameter to "atexit" is "void (*)(void)". */
7630 }
7633 }
7635 /* Returns a pointer to the `atexit' function. Note that if
7636 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
7637 `__cxa_atexit' function specified in the IA64 C++ ABI. */
7639 static tree
7641 {
7642 tree atexit_fndecl;
7643 tree fn_type;
7644 tree fn_ptr_type;
7652 {
7653 /* The declaration for `__cxa_atexit' is:
7655 int __cxa_atexit (void (*)(void *), void *, void *)
7657 We build up the argument types and then the function type
7658 itself. */
7662 /* First, build the pointer-to-function type for the first
7663 argument. */
7665 /* Then, build the rest of the argument types. */
7668 {
7671 }
7672 else
7673 {
7676 }
7677 /* And the final __cxa_atexit type. */
7680 NULL_TREE);
7683 else
7685 }
7686 else
7687 {
7688 /* The declaration for `atexit' is:
7690 int atexit (void (*)());
7692 We build up the argument types and then the function type
7693 itself. */
7695 /* Build the final atexit type. */
7699 }
7701 /* Now, build the function declaration. */
7709 }
7711 /* Like get_atexit_node, but for thread-local cleanups. */
7713 static tree
7715 {
7716 /* The declaration for `__cxa_thread_atexit' is:
7718 int __cxa_thread_atexit (void (*)(void *), void *, void *) */
7722 NULL_TREE);
7724 /* Now, build the function declaration. */
7728 }
7730 /* Returns the __dso_handle VAR_DECL. */
7732 static tree
7734 {
7738 /* Declare the variable. */
7740 ptr_type_node);
7742 #ifdef HAVE_GAS_HIDDEN
7744 {
7747 }
7748 #endif
7751 }
7753 /* Begin a new function with internal linkage whose job will be simply
7754 to destroy some particular variable. */
7758 static tree
7760 {
7762 tree fntype;
7763 tree fndecl;
7769 /* No need to mangle this. */
7772 /* Build the name of the function. */
7774 /* Build the function declaration. */
7777 /* It's a function with internal linkage, generated by the
7778 compiler. */
7781 /* Make the function `inline' so that it is only emitted if it is
7782 actually needed. It is unlikely that it will be inlined, since
7783 it is only called via a function pointer, but we avoid unnecessary
7784 emissions this way. */
7787 /* Build the parameter. */
7789 {
7794 }
7802 }
7804 /* Finish the cleanup function begun by start_cleanup_fn. */
7806 static void
7808 {
7812 }
7814 /* Generate code to handle the destruction of DECL, an object with
7815 static storage duration. */
7817 tree
7819 {
7820 tree cleanup;
7821 tree addr;
7822 tree compound_stmt;
7823 tree fcall;
7824 tree type;
7827 tree atex_node;
7833 /* If we're using "__cxa_atexit" (or "__cxa_thread_atexit" or
7834 "__aeabi_atexit"), and DECL is a class object, we can just pass the
7835 destructor to "__cxa_atexit"; we don't have to build a temporary
7836 function to do the cleanup. */
7837 dso_parm = (flag_use_cxa_atexit
7842 {
7845 /* Make sure it is accessible. */
7847 tf_warning_or_error);
7848 }
7849 else
7850 {
7851 /* Call build_cleanup before we enter the anonymous function so
7852 that any access checks will be done relative to the current
7853 scope, rather than the scope of the anonymous function. */
7856 /* Now start the function. */
7859 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
7860 to the original function, rather than the anonymous one. That
7861 will make the back end think that nested functions are in use,
7862 which causes confusion. */
7867 /* Create the body of the anonymous function. */
7872 }
7874 /* Call atexit with the cleanup function. */
7880 else
7884 {
7885 /* We must convert CLEANUP to the type that "__cxa_atexit"
7886 expects. */
7888 /* "__cxa_atexit" will pass the address of DECL to the
7889 cleanup function. */
7892 /* The declared type of the parameter to "__cxa_atexit" is
7893 "void *". For plain "T*", we could just let the
7894 machinery in cp_build_function_call convert it -- but if the
7895 type is "cv-qualified T *", then we need to convert it
7896 before passing it in, to avoid spurious errors. */
7898 }
7899 else
7900 /* Since the cleanup functions we build ignore the address
7901 they're given, there's no reason to pass the actual address
7902 in, and, in general, it's cheaper to pass NULL than any
7903 other value. */
7908 tf_warning_or_error);
7910 /* Just pass NULL to the dso handle parm if we don't actually
7911 have a DSO handle on this target. */
7913 else
7917 {
7920 {
7923 }
7924 else
7925 {
7928 }
7929 }
7930 else
7931 {
7934 }
7937 }
7939 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
7940 is its initializer. Generate code to handle the construction
7941 and destruction of DECL. */
7943 static void
7945 {
7949 /* Some variables require no dynamic initialization. */
7951 {
7952 /* Make sure the destructor is callable. */
7956 }
7960 {
7964 else
7969 {
7971 "C++11 %<thread_local%> allows dynamic initialization "
7974 }
7976 }
7979 {
7980 /* Emit code to perform this initialization but once. */
7985 /* We don't need thread-safety code for thread-local vars. */
7989 /* Emit code to perform this initialization but once. This code
7990 looks like:
7992 static <type> guard;
7993 if (!__atomic_load (guard.first_byte)) {
7994 if (__cxa_guard_acquire (&guard)) {
7995 bool flag = false;
7996 try {
7997 // Do initialization.
7998 flag = true; __cxa_guard_release (&guard);
7999 // Register variable for destruction at end of program.
8000 } catch {
8001 if (!flag) __cxa_guard_abort (&guard);
8002 }
8003 }
8004 }
8006 Note that the `flag' variable is only set to 1 *after* the
8007 initialization is complete. This ensures that an exception,
8008 thrown during the construction, will cause the variable to
8009 reinitialized when we pass through this code again, as per:
8011 [stmt.dcl]
8013 If the initialization exits by throwing an exception, the
8014 initialization is not complete, so it will be tried again
8015 the next time control enters the declaration.
8017 This process should be thread-safe, too; multiple threads
8018 should not be able to initialize the variable more than
8019 once. */
8021 /* Create the guard variable. */
8024 /* Begin the conditional initialization. */
8031 {
8044 acquire_fn = push_library_fn
8047 NULL_TREE),
8052 NULL_TREE);
8062 inner_if_stmt);
8070 void_node,
8074 /* Do the initialization itself. */
8076 init = add_stmt_to_compound
8078 init = add_stmt_to_compound
8080 }
8081 else
8084 /* Use atexit to register a function for destroying this static
8085 variable. */
8091 {
8095 }
8100 }
8103 else
8105 }
8107 \f
8108 /* Make TYPE a complete type based on INITIAL_VALUE.
8109 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
8110 2 if there was no information (in which case assume 0 if DO_DEFAULT),
8111 3 if the initializer list is empty (in pedantic mode). */
8113 int
8115 {
8119 /* Don't get confused by a CONSTRUCTOR for some other type. */
8126 {
8128 tree value;
8130 /* An array of character type can be initialized from a
8131 brace-enclosed string constant.
8133 FIXME: this code is duplicated from reshape_init. Probably
8134 we should just call reshape_init here? */
8138 {
8145 }
8147 /* If any of the elements are parameter packs, we can't actually
8148 complete this type now because the array size is dependent. */
8150 {
8153 {
8156 }
8157 }
8158 }
8162 /* We can create the array before the element type is complete, which
8163 means that we didn't have these two bits set in the original type
8164 either. In completing the type, we are expected to propagate these
8165 bits. See also complete_type which does the same thing for arrays
8166 of fixed size. */
8169 {
8174 }
8177 }
8179 /* As above, but either give an error or reject zero-size arrays, depending
8180 on COMPLAIN. */
8182 int
8185 {
8188 /* In SFINAE context we can't be lenient about zero-size arrays. */
8195 {
8201 {
8204 }
8208 }
8210 }
8211 \f
8212 /* Return zero if something is declared to be a member of type
8213 CTYPE when in the context of CUR_TYPE. STRING is the error
8214 message to print in that case. Otherwise, quietly return 1. */
8216 static int
8218 {
8220 {
8223 else
8226 }
8228 }
8229 \f
8230 /* Subroutine of `grokdeclarator'. */
8232 /* Generate errors possibly applicable for a given set of specifiers.
8233 This is for ARM $7.1.2. */
8235 static void
8243 {
8245 {
8282 }
8286 && !flag_noexcept_type
8292 }
8294 /* DECL is a member function or static data member and is presently
8295 being defined. Check that the definition is taking place in a
8296 valid namespace. */
8298 static void
8300 {
8301 /* These checks only apply to member functions and static data
8302 members. */
8304 /* We check for problems with specializations in pt.c in
8305 check_specialization_namespace, where we can issue better
8306 diagnostics. */
8309 /* We check this in check_explicit_instantiation_namespace. */
8312 /* [class.mfct]
8314 A member function definition that appears outside of the
8315 class definition shall appear in a namespace scope enclosing
8316 the class definition.
8318 [class.static.data]
8320 The definition for a static data member shall appear in a
8321 namespace scope enclosing the member's class definition. */
8325 }
8327 /* Build a PARM_DECL for the "this" parameter of FN. TYPE is the
8328 METHOD_TYPE for a non-static member function; QUALS are the
8329 cv-qualifiers that apply to the function. */
8331 tree
8333 {
8334 tree this_type;
8335 tree qual_type;
8336 tree parm;
8337 cp_cv_quals this_quals;
8340 {
8341 this_type
8344 }
8345 else
8347 /* The `this' parameter is implicitly `const'; it cannot be
8348 assigned to. */
8354 }
8356 /* DECL is a static member function. Complain if it was declared
8357 with function-cv-quals. */
8359 static void
8361 {
8364 decl);
8365 }
8367 // Check that FN takes no arguments and returns bool.
8368 static void
8370 {
8371 // A constraint is nullary.
8375 // The declared return type of the concept shall be bool, and
8376 // it shall not be deduced from it definition.
8382 }
8384 /* Helper function. Replace the temporary this parameter injected
8385 during cp_finish_omp_declare_simd with the real this parameter. */
8387 static tree
8389 {
8398 }
8400 /* CTYPE is class type, or null if non-class.
8401 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
8402 or METHOD_TYPE.
8403 DECLARATOR is the function's name.
8404 PARMS is a chain of PARM_DECLs for the function.
8405 VIRTUALP is truthvalue of whether the function is virtual or not.
8406 FLAGS are to be passed through to `grokclassfn'.
8407 QUALS are qualifiers indicating whether the function is `const'
8408 or `volatile'.
8409 RAISES is a list of exceptions that this function can raise.
8410 CHECK is 1 if we must find this method in CTYPE, 0 if we should
8411 not look, and -1 if we should not call `grokclassfn' at all.
8413 SFK is the kind of special function (if any) for the new function.
8415 Returns `NULL_TREE' if something goes wrong, after issuing
8416 applicable error messages. */
8418 static tree
8420 tree type,
8421 tree declarator,
8422 tree parms,
8423 tree orig_declarator,
8424 tree decl_reqs,
8427 cp_cv_quals quals,
8428 cp_ref_qualifier rqual,
8429 tree raises,
8435 special_function_kind sfk,
8438 tree in_namespace,
8440 location_t location)
8441 {
8442 tree decl;
8444 tree t;
8446 // Was the concept specifier present?
8449 // Concept declarations must have a corresponding definition.
8451 {
8454 }
8463 /* Set the constraints on the declaration. */
8465 {
8470 /* Adjust the required expression into a constraint. */
8476 }
8478 /* If we have an explicit location, use it, otherwise use whatever
8479 build_lang_decl used (probably input_location). */
8484 {
8489 /* Allocate space to hold the vptr bit if needed. */
8491 }
8497 /* Propagate volatile out from type to decl. */
8501 /* Setup decl according to sfk. */
8503 {
8516 }
8519 {
8522 orig_declarator);
8523 else
8524 {
8529 {
8530 /* Something like `template <class T> friend void f<T>()'. */
8533 orig_declarator);
8535 }
8538 /* A friend declaration of the form friend void f<>(). Record
8539 the information in the TEMPLATE_ID_EXPR. */
8548 {
8551 decl);
8553 }
8556 {
8559 decl);
8561 }
8562 }
8563 }
8565 /* If this decl has namespace scope, set that up. */
8571 /* `main' and builtins have implicit 'C' linkage. */
8586 /* Should probably propagate const out from type to decl I bet (mrs). */
8588 {
8591 }
8597 {
8601 }
8604 {
8615 }
8617 /* Members of anonymous types and local classes have no linkage; make
8618 them internal. If a typedef is made later, this will be changed. */
8624 {
8625 /* [basic.link]: A name with no linkage (notably, the name of a class
8626 or enumeration declared in a local scope) shall not be used to
8627 declare an entity with linkage.
8629 DR 757 relaxes this restriction for C++0x. */
8631 }
8635 {
8638 }
8640 /* If the declaration was declared inline, mark it as such. */
8642 {
8646 }
8650 // If the concept declaration specifier was found, check
8651 // that the declaration satisfies the necessary requirements.
8653 {
8656 }
8660 {
8663 TYPE_UNQUALIFIED,
8664 REF_QUAL_NONE);
8667 {
8671 decl);
8673 }
8676 {
8680 decl);
8682 }
8683 }
8686 {
8688 {
8692 }
8696 }
8701 {
8705 /* [over.literal]/6: Literal operators shall not have C linkage. */
8707 {
8711 }
8714 {
8717 {
8720 }
8724 {
8728 }
8730 {
8734 }
8735 }
8736 else
8737 {
8740 }
8741 }
8744 /* Make the init_value nonzero so pushdecl knows this is not
8745 tentative. error_mark_node is replaced later with the BLOCK. */
8752 {
8753 /* Adjust "omp declare simd" attributes. */
8756 {
8757 tree attr;
8760 {
8765 {
8767 cl = c_omp_declare_simd_clauses_to_numbers
8771 else
8773 }
8774 }
8775 }
8776 }
8778 /* Caller will do the rest of this. */
8785 /* 12.4/3 */
8793 template_count,
8804 {
8807 }
8809 /* Check main's type after attributes have been applied. */
8811 {
8813 integer_type_node))
8814 {
8816 tree newtype;
8820 }
8823 }
8826 {
8828 (processing_template_decl
8830 ? current_template_parms
8837 {
8838 tree ok;
8839 tree pushed_scope;
8842 /* Because grokfndecl is always supposed to return a
8843 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
8844 here. We depend on our callers to figure out that its
8845 really a template that's being returned. */
8850 {
8851 /* Remove the `this' parm added by grokclassfn. */
8854 }
8856 {
8859 }
8861 {
8866 }
8868 /* Since we've smashed OLD_DECL to its
8869 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
8873 /* Attempt to merge the declarations. This can fail, in
8874 the case of some invalid specialization declarations. */
8880 {
8884 }
8888 }
8889 }
8901 }
8903 /* decl is a FUNCTION_DECL.
8904 specifiers are the parsed virt-specifiers.
8906 Set flags to reflect the virt-specifiers.
8908 Returns decl. */
8910 static tree
8912 {
8920 }
8922 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
8923 the linkage that DECL will receive in the object file. */
8925 static void
8927 {
8928 /* A static data member always has static storage duration and
8929 external linkage. Note that static data members are forbidden in
8930 local classes -- the only situation in which a class has
8931 non-external linkage. */
8934 /* For non-template classes, static data members are always put
8935 out in exactly those files where they are defined, just as
8936 with ordinary namespace-scope variables. */
8939 }
8941 /* Create a VAR_DECL named NAME with the indicated TYPE.
8943 If SCOPE is non-NULL, it is the class type or namespace containing
8944 the variable. If SCOPE is NULL, the variable should is created in
8945 the innermost enclosing scope. */
8947 static tree
8949 tree name,
8950 tree orig_declarator,
8957 tree scope)
8958 {
8959 tree decl;
8960 tree explicit_scope;
8967 /* Compute the scope in which to place the variable, but remember
8968 whether or not that scope was explicitly specified by the user. */
8971 {
8972 /* An explicit "extern" specifier indicates a namespace-scope
8973 variable. */
8978 }
8982 template, we need DECL_LANG_SPECIFIC. */
8984 /* Similarly for namespace-scope variables with language linkage
8985 other than C++. */
8988 /* Similarly for static data members. */
8990 /* Similarly for explicit specializations. */
8991 || (orig_declarator
8994 else
8999 else
9003 {
9006 }
9009 {
9011 /* This function is only called with out-of-class definitions. */
9014 }
9015 /* At top level, either `static' or no s.c. makes a definition
9016 (perhaps tentative), and absence of `static' makes it public. */
9018 {
9021 || ! constp
9022 || volatilep
9025 }
9026 /* Not at top level, only `static' makes a static definition. */
9027 else
9028 {
9031 }
9034 {
9036 {
9040 }
9043 }
9045 /* If the type of the decl has no linkage, make sure that we'll
9046 notice that in mark_used. */
9055 {
9056 /* [basic.link]: A name with no linkage (notably, the name of a class
9057 or enumeration declared in a local scope) shall not be used to
9058 declare an entity with linkage.
9060 DR 757 relaxes this restriction for C++0x. */
9063 }
9064 else
9072 /* Check that the variable can be safely declared as a concept.
9073 Note that this also forbids explicit specializations. */
9075 {
9077 {
9080 }
9081 else
9086 }
9089 {
9093 }
9095 // Handle explicit specializations and instantiations of variable templates.
9101 }
9103 /* Create and return a canonical pointer to member function type, for
9104 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
9106 tree
9108 {
9110 tree t;
9115 /* Make sure that we always have the unqualified pointer-to-member
9116 type first. */
9118 {
9121 }
9123 /* If a canonical type already exists for this type, use it. We use
9124 this method instead of type_hash_canon, because it only does a
9125 simple equality check on the list of field members. */
9133 /* Let the front end know this is a pointer to member function. */
9140 delta_type_node);
9146 /* Zap out the name so that the back end will give us the debugging
9147 information for this anonymous RECORD_TYPE. */
9150 /* Cache this pointer-to-member type so that we can find it again
9151 later. */
9160 }
9162 /* Create and return a pointer to data member type. */
9164 tree
9166 {
9168 {
9173 }
9174 else
9175 {
9178 }
9179 }
9181 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
9182 Check to see that the definition is valid. Issue appropriate error
9183 messages. Return 1 if the definition is particularly bad, or 0
9184 otherwise. */
9186 static int
9188 {
9189 /* Avoid redundant diagnostics on out-of-class definitions. */
9192 /* Can't check yet if we don't know the type. */
9195 /* If DECL is declared constexpr, we'll do the appropriate checks
9196 in check_initializer. Similarly for inline static data members. */
9202 {
9205 "in-class initialization of static data member %q#D of "
9209 "%<constexpr%> needed for in-class initialization of "
9211 else
9213 "in-class initialization of static data member %q#D of "
9216 }
9218 /* Motion 10 at San Diego: If a static const integral data member is
9219 initialized with an integral constant expression, the initializer
9220 may appear either in the declaration (within the class), or in
9221 the definition, but not both. If it appears in the class, the
9222 member is a member constant. The file-scope definition is always
9223 required. */
9225 {
9227 "invalid in-class initialization of static data member "
9229 type);
9231 }
9234 "ISO C++ forbids in-class initialization of non-const "
9236 decl);
9239 "ISO C++ forbids initialization of member constant "
9243 }
9245 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
9246 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
9247 expressions out into temporary variables so that walk_tree doesn't
9248 step into them (c++/15764). */
9250 static tree
9252 {
9256 {
9262 }
9266 }
9268 /* Entry point for the above. */
9270 static void
9272 {
9274 /* Break out any function calls into temporary variables. */
9276 }
9278 /* Reduce a SIZEOF_EXPR to its value. */
9280 tree
9282 {
9283 tree r;
9290 else
9296 }
9298 /* Given the SIZE (i.e., number of elements) in an array, compute
9299 an appropriate index type for the array. If non-NULL, NAME is
9300 the name of the entity being declared. */
9302 tree
9304 {
9305 tree itype;
9312 {
9319 /* In C++98, we mark a non-constant array bound with a magic
9321 else
9322 {
9327 {
9330 {
9336 else
9339 }
9343 }
9350 }
9355 /* The array bound must be an integer type. */
9357 {
9362 else
9366 }
9367 }
9369 /* A type is dependent if it is...an array type constructed from any
9370 dependent type or whose size is specified by a constant expression
9371 that is value-dependent. */
9372 /* We can only call value_dependent_expression_p on integral constant
9373 expressions; treat non-constant expressions as dependent, too. */
9377 {
9378 /* We cannot do any checking for a SIZE that isn't known to be
9379 constant. Just build the index type and mark that it requires
9380 structural equality checks. */
9387 }
9390 {
9395 /* Use the folded result for VLAs, too; it will have resolved
9396 SIZEOF_EXPR. */
9398 }
9400 /* Normally, the array-bound will be a constant. */
9402 {
9403 /* Check to see if the array bound overflowed. Make that an
9404 error, no matter how generous we're being. */
9407 /* An array must have a positive number of elements. */
9409 {
9414 else
9417 }
9418 /* As an extension we allow zero-sized arrays. */
9420 {
9422 /* We must fail if performing argument deduction (as
9423 indicated by the state of complain), so that
9424 another substitution can be found. */
9430 else
9432 }
9433 }
9435 /* We don't allow VLAs at non-function scopes, or during
9436 tentative template substitution. */
9439 {
9442 /* `(int) &fn' is not a valid array bound. */
9445 name);
9446 else
9449 }
9451 {
9454 else
9456 }
9458 {
9462 else
9465 }
9468 /* A variable sized array. */
9470 else
9471 {
9472 /* Compute the index of the largest element in the array. It is
9473 one less than the number of elements in the array. We save
9474 and restore PROCESSING_TEMPLATE_DECL so that computations in
9475 cp_build_binary_op will be appropriately folded. */
9476 {
9477 processing_template_decl_sentinel s;
9479 MINUS_EXPR,
9482 complain),
9483 complain);
9485 }
9488 {
9489 /* A variable sized array. */
9496 {
9497 /* We have to add 1 -- in the ubsan routine we generate
9498 LE_EXPR rather than LT_EXPR. */
9503 }
9504 }
9505 /* Make sure that there was no overflow when creating to a signed
9506 index type. (For example, on a 32-bit machine, an array with
9507 size 2^32 - 1 is too big.) */
9510 {
9515 }
9516 }
9518 /* Create and return the appropriate index type. */
9521 /* If the index type were dependent, we would have returned early, so
9522 remember that it isn't. */
9526 }
9528 /* Returns the scope (if any) in which the entity declared by
9529 DECLARATOR will be located. If the entity was declared with an
9530 unqualified name, NULL_TREE is returned. */
9532 tree
9534 {
9538 /* If the declarator-id is a SCOPE_REF, the scope in which the
9539 declaration occurs is the first operand. */
9544 /* Otherwise, the declarator is not a qualified name; the entity will
9545 be declared in the current scope. */
9547 }
9549 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
9550 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
9551 with this type. */
9553 static tree
9555 {
9558 /* If things have already gone awry, bail now. */
9562 /* 8.3.4/1: If the type of the identifier of D contains the auto
9563 type-specifier, the program is ill-formed. */
9565 {
9568 }
9570 /* If there are some types which cannot be array elements,
9571 issue an error-message and return. */
9573 {
9577 else
9584 else
9591 else
9598 else
9604 }
9606 /* [dcl.array]
9608 The constant expressions that specify the bounds of the arrays
9609 can be omitted only for the first member of the sequence. */
9611 {
9615 name);
9616 else
9621 }
9623 /* Figure out the index type for the array. */
9627 /* [dcl.array]
9628 T is called the array element type; this type shall not be [...] an
9629 abstract class type. */
9633 }
9635 /* Returns the smallest location != UNKNOWN_LOCATION among the
9636 three stored in LOCATIONS[ds_const], LOCATIONS[ds_volatile],
9637 and LOCATIONS[ds_restrict]. */
9639 static location_t
9641 {
9656 }
9658 /* Check that it's OK to declare a function with the indicated TYPE
9659 and TYPE_QUALS. SFK indicates the kind of special function (if any)
9660 that this function is. OPTYPE is the type given in a conversion
9661 operator declaration, or the class type for a constructor/destructor.
9662 Returns the actual return type of the function; that may be different
9663 than TYPE if an error occurs, or for certain special functions. */
9665 static tree
9667 tree type,
9668 tree optype,
9671 {
9673 {
9683 else
9694 /* We can't use the proper return type here because we run into
9695 problems with ambiguous bases and covariant returns. */
9698 else
9707 "qualifiers are not allowed on declaration of "
9718 "qualifiers are not allowed on declaration of "
9729 }
9732 }
9734 /* A variable or data member (whose unqualified name is IDENTIFIER)
9735 has been declared with the indicated TYPE. If the TYPE is not
9736 acceptable, issue an error message and return a type to use for
9737 error-recovery purposes. */
9739 tree
9741 {
9743 {
9747 {
9750 }
9751 else
9754 }
9757 }
9759 /* Handle declaring DECL as an inline variable. */
9761 static void
9763 {
9766 {
9770 }
9773 "inline variables are only available "
9776 {
9779 }
9780 }
9783 /* Assign a typedef-given name to a class or enumeration type declared
9784 as anonymous at first. This was split out of grokdeclarator
9785 because it is also used in libcc1. */
9787 void
9789 {
9792 /* Replace the anonymous name with the real name everywhere. */
9794 {
9796 /* We do not rename the debug info representing the
9797 unnamed tagged type because the standard says in
9798 [dcl.typedef] that the naming applies only for
9799 linkage purposes. */
9800 /*debug_hooks->set_name (t, decl);*/
9802 }
9807 /* If this is a typedef within a template class, the nested
9808 type is a (non-primary) template. The name for the
9809 template needs updating as well. */
9814 /* Adjust linkage now that we aren't unnamed anymore. */
9817 /* FIXME remangle member functions; member functions of a
9818 type with external linkage have external linkage. */
9820 /* Check that our job is done, and that it would fail if we
9821 attempted to do it again. */
9823 }
9825 /* Given declspecs and a declarator (abstract or otherwise), determine
9826 the name and type of the object declared and construct a DECL node
9827 for it.
9829 DECLSPECS points to the representation of declaration-specifier
9830 sequence that precedes declarator.
9832 DECL_CONTEXT says which syntactic context this declaration is in:
9833 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
9834 FUNCDEF for a function definition. Like NORMAL but a few different
9835 error messages in each case. Return value may be zero meaning
9836 this definition is too screwy to try to parse.
9837 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
9838 handle member functions (which have FIELD context).
9839 Return value may be zero meaning this definition is too screwy to
9840 try to parse.
9841 PARM for a parameter declaration (either within a function prototype
9842 or before a function body). Make a PARM_DECL, or return void_type_node.
9843 TPARM for a template parameter declaration.
9844 CATCHPARM for a parameter declaration before a catch clause.
9845 TYPENAME if for a typename (in a cast or sizeof).
9846 Don't make a DECL node; just return the ..._TYPE node.
9847 FIELD for a struct or union field; make a FIELD_DECL.
9848 BITFIELD for a field with specified width.
9850 INITIALIZED is as for start_decl.
9852 ATTRLIST is a pointer to the list of attributes, which may be NULL
9853 if there are none; *ATTRLIST may be modified if attributes from inside
9854 the declarator should be applied to the declaration.
9856 When this function is called, scoping variables (such as
9857 CURRENT_CLASS_TYPE) should reflect the scope in which the
9858 declaration occurs, not the scope in which the new declaration will
9859 be placed. For example, on:
9861 void S::f() { ... }
9863 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
9864 should not be `S'.
9866 Returns a DECL (if a declarator is present), a TYPE (if there is no
9867 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
9868 error occurs. */
9870 tree
9876 {
9888 /* True if this declarator is a function definition. */
9892 #if 0
9893 /* See the code below that used this. */
9895 #endif
9897 /* Keep track of what sort of function is being processed
9898 so that we can warn about default return values, or explicit
9899 return values which do not match prescribed defaults. */
9905 /* cv-qualifiers that apply to the declarator, for a declaration of
9906 a member function. */
9908 /* virt-specifiers that apply to the declarator, for a declaration of
9909 a member function. */
9911 /* ref-qualifier that applies to the declarator, for a declaration of
9912 a member function. */
9914 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
9921 /* The unqualified name of the declarator; either an
9922 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
9923 tree unqualified_id;
9924 /* The class type, if any, in which this entity is located,
9925 or NULL_TREE if none. Note that this value may be different from
9926 the current class type; for example if an attempt is made to declare
9927 "A::f" inside "B", this value will be "A". */
9929 /* The NAMESPACE_DECL for the namespace in which this entity is
9930 located. If an unqualified name is used to declare the entity,
9931 this value will be NULL_TREE, even if the entity is located at
9932 namespace scope. */
9934 cp_storage_class storage_class;
9955 // Was concept_p specified? Note that ds_concept
9956 // implies ds_constexpr!
9989 /* Look inside a declarator for the name being declared
9990 and get it as a string, for an error message. */
9992 id_declarator;
9994 {
9999 {
10003 {
10007 }
10011 {
10017 {
10019 {
10020 /* [dcl.meaning]
10022 A declarator-id shall not be qualified except
10023 for ...
10025 None of the cases are permitted in block
10026 scope. */
10029 decl);
10033 else
10037 }
10039 {
10042 {
10045 }
10047 && current_class_type
10049 current_class_type))
10050 {
10054 }
10055 }
10058 }
10060 {
10062 {
10064 {
10067 }
10070 {
10073 }
10080 }
10084 {
10090 }
10091 /* Fall through. */
10098 {
10100 dname);
10102 }
10105 else
10106 {
10113 else
10115 }
10120 }
10122 }
10139 }
10142 }
10144 /* [dcl.fct.edf]
10146 The declarator in a function-definition shall have the form
10147 D1 ( parameter-declaration-clause) ... */
10149 {
10152 }
10157 {
10160 }
10163 {
10166 {
10169 }
10172 {
10174 {
10177 }
10179 {
10182 }
10183 }
10184 }
10186 /* Anything declared one level down from the top level
10187 must be one of the parameters of a function
10188 (because the body is at least two levels down). */
10190 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
10191 by not allowing C++ class definitions to specify their parameters
10192 with xdecls (must be spec.d in the parmlist).
10194 Since we now wait to push a class scope until we are sure that
10195 we are in a legitimate method context, we must set oldcname
10196 explicitly (since current_class_name is not yet alive).
10198 We also want to avoid calling this a PARM if it is in a namespace. */
10201 {
10207 }
10213 {
10216 }
10219 {
10222 }
10224 /* If there were multiple types specified in the decl-specifier-seq,
10225 issue an error message. */
10227 {
10230 }
10233 {
10236 }
10238 /* Extract the basic type from the decl-specifier-seq. */
10241 {
10244 }
10245 /* If the entire declaration is itself tagged as deprecated then
10246 suppress reports of deprecated items. */
10251 {
10258 }
10259 /* No type at all: default to `int', and set DEFAULTED_INT
10260 because it was not a user-defined typedef. */
10262 {
10264 {
10265 /* These imply 'int'. */
10268 }
10269 /* If we just have "complex", it is equivalent to "complex double". */
10272 {
10275 "ISO C++ does not support plain %<complex%> meaning "
10277 }
10278 }
10279 /* Gather flags. */
10283 #if 0
10284 /* See the code below that used this. */
10287 #endif
10292 else
10296 {
10298 ctor_return_type,
10299 type_quals,
10302 }
10304 {
10309 /* We handle `main' specially here, because 'main () { }' is so
10310 common. With no options, it is allowed. With -Wreturn-type,
10311 it is a warning. It is only an error with -pedantic-errors. */
10312 is_main = (funcdef_flag
10328 else
10333 /* FIXME we should be able to propagate the error_mark_node as is
10334 for other contexts too. */
10336 else
10338 }
10343 {
10345 {
10349 }
10354 }
10356 /* Now process the modifiers that were specified
10357 and check for invalid combinations. */
10359 /* Long double is a special combination. */
10361 {
10365 }
10367 /* Check all other uses of type modifiers. */
10370 {
10392 {
10397 }
10398 else
10399 {
10402 {
10405 name);
10408 }
10409 }
10411 /* Discard the type modifiers if they are invalid. */
10413 {
10419 }
10420 }
10422 /* Decide whether an integer type is signed or not.
10423 Optionally treat bitfields as signed by default. */
10425 /* [class.bit]
10427 It is implementation-defined whether a plain (neither
10428 explicitly signed or unsigned) char, short, int, or long
10429 bit-field is signed or unsigned.
10431 Naturally, we extend this to long long as well. Note that
10432 this does not include wchar_t. */
10434 && !signed_p
10435 /* A typedef for plain `int' without `signed' can be
10436 controlled just like plain `int', but a typedef for
10437 `signed int' cannot be so controlled. */
10438 && !(typedef_decl
10442 {
10455 else
10457 }
10470 {
10473 /* If a modifier is specified, the resulting complex is the complex
10474 form of TYPE. E.g, "complex short" is "complex short int". */
10483 else
10485 }
10487 /* If we're using the injected-class-name to form a compound type or a
10488 declaration, replace it with the underlying class so we don't get
10489 redundant typedefs in the debug output. But if we are returning the
10490 type unchanged, leave it alone so that it's available to
10491 maybe_get_template_decl_from_type_decl. */
10499 type = cp_build_qualified_type_real
10503 /* We might have ignored or rejected some of the qualifiers. */
10510 {
10514 }
10526 {
10528 {
10533 }
10537 }
10540 /* Issue errors about use of storage classes for parameters. */
10542 {
10544 {
10547 }
10549 {
10552 }
10558 /* Function parameters cannot be concept. */
10561 /* Function parameters cannot be constexpr. If we saw one, moan
10562 and pretend it wasn't there. */
10564 {
10567 }
10568 }
10570 /* Give error if `virtual' is used outside of class declaration. */
10573 {
10577 }
10580 {
10595 declspecs->gnu_thread_keyword_p
10601 {
10626 }
10629 {
10631 {
10635 "type must be cv-qualified %<auto%> or reference to "
10637 }
10640 }
10650 }
10652 /* Static anonymous unions are dealt with here. */
10658 /* Warn about storage classes that are invalid for certain
10659 kinds of declarations (parameters, typenames, etc.). */
10661 && ((storage_class
10665 {
10668 }
10673 {
10677 ;
10679 ;
10681 /* C++ allows static class elements. */
10683 /* C++ also allows inlines and signed and unsigned elements,
10684 but in those cases we don't come in here. */
10685 ;
10686 else
10687 {
10690 else
10691 {
10694 else
10696 }
10702 }
10703 }
10708 {
10711 }
10715 {
10720 /* When thread_local is applied to a variable of block scope the
10721 storage-class-specifier static is implied if it does not appear
10722 explicitly. */
10725 }
10728 {
10732 }
10736 else
10737 {
10740 {
10753 }
10754 }
10757 {
10758 /* Apply the c++11 attributes to the type preceding them. */
10762 }
10764 /* Determine the type of the entity declared by recurring on the
10765 declarator. */
10767 {
10769 tree attrs;
10776 {
10788 attr_flags);
10789 }
10793 /* We don't want to warn in parmeter context because we don't
10794 yet know if the parse will succeed, and this might turn out
10795 to be a constructor call. */
10798 /* If the type is class-like and the inner name used a
10799 global namespace qualifier, we need the parens.
10800 Unfortunately all we can tell is whether a qualified name
10801 was used or not. */
10802 && !(inner_declarator
10813 {
10821 /* [dcl.array]/1:
10823 The optional attribute-specifier-seq appertains to the
10824 array. */
10830 {
10831 tree arg_types;
10834 /* Declaring a function type. */
10840 /* Pick up type qualifiers which should be applied to `this'. */
10842 /* Pick up virt-specifiers. */
10844 /* And ref-qualifier, too */
10846 /* And tx-qualifier. */
10848 /* Pick up the exception specifications. */
10850 /* If the exception-specification is ill-formed, let's pretend
10851 there wasn't one. */
10859 /* Say it's a definition only for the CALL_EXPR
10860 closest to the identifier. */
10863 /* Handle a late-specified return type. */
10866 {
10868 {
10870 {
10875 {
10877 "%<auto%> type specifier without trailing "
10880 "only available with -std=c++14 or "
10882 }
10884 {
10888 }
10889 }
10891 {
10896 }
10898 {
10900 {
10903 "for %qT must have trailing return "
10905 else
10908 type);
10911 }
10917 else
10921 }
10922 }
10925 {
10927 /* Not using maybe_warn_cpp0x because this should
10928 always be an error. */
10931 else
10935 }
10936 }
10942 {
10945 }
10948 {
10952 /* We now know that the TYPE_QUALS don't apply to the
10953 decl, but to its return type. */
10955 }
10957 /* Error about some types functions can't return. */
10960 {
10964 }
10966 {
10970 }
10974 && funcdecl_p
10980 {
10981 /* We are within a class's scope. If our declarator name
10982 is the same as the class name, and we are defining
10983 a function, then it is a constructor/destructor, and
10984 therefore returns a void type. */
10986 /* ISO C++ 12.4/2. A destructor may not be declared
10987 const or volatile. A destructor may not be static.
10988 A destructor may not be declared with ref-qualifier.
10990 ISO C++ 12.1. A constructor may not be declared
10991 const or volatile. A constructor may not be
10992 virtual. A constructor may not be static.
10993 A constructor may not be declared with ref-qualifier. */
10999 {
11004 }
11007 {
11013 }
11017 current_class_type,
11018 flags))
11022 {
11023 /* It's a constructor. */
11027 {
11031 }
11035 }
11038 }
11040 {
11042 {
11043 /* Cannot be both friend and virtual. */
11046 }
11052 name);
11053 }
11055 {
11057 {
11060 }
11063 }
11065 {
11068 }
11077 {
11081 }
11087 {
11089 /* transaction_safe applies to the type, but
11090 transaction_safe_dynamic applies to the function. */
11093 else
11095 }
11097 /* [dcl.fct]/2:
11099 The optional attribute-specifier-seq appertains to
11100 the function type. */
11105 }
11111 /* Filter out pointers-to-references and references-to-references.
11112 We can get these if a TYPE_DECL is used. */
11115 {
11117 {
11120 }
11122 /* In C++0x, we allow reference to reference declarations
11123 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
11124 and template type arguments [14.3.1/4 temp.arg.type]. The
11125 check for direct reference to reference declarations, which
11126 are still forbidden, occurs below. Reasoning behind the change
11127 can be found in DR106, DR540, and the rvalue reference
11128 proposals. */
11130 {
11133 }
11134 }
11136 {
11141 }
11143 /* We now know that the TYPE_QUALS don't apply to the decl,
11144 but to the target of the pointer. */
11147 /* This code used to handle METHOD_TYPE, but I don't think it's
11148 possible to get it here anymore. */
11152 {
11156 memfn_quals,
11157 rqual);
11163 }
11171 type);
11173 /* When the pointed-to type involves components of variable size,
11174 care must be taken to ensure that the size evaluation code is
11175 emitted early enough to dominate all the possible later uses
11176 and late enough for the variables on which it depends to have
11177 been assigned.
11179 This is expected to happen automatically when the pointed-to
11180 type has a name/declaration of it's own, but special attention
11181 is required if the type is anonymous.
11183 We handle the NORMAL and FIELD contexts here by inserting a
11184 dummy statement that just evaluates the size at a safe point
11185 and ensures it is not deferred until e.g. within a deeper
11186 conditional context (c++/43555).
11188 We expect nothing to be needed here for PARM or TYPENAME.
11189 Evaluating the size at this point for TYPENAME would
11190 actually be incorrect, as we might be in the middle of an
11191 expression with side effects on the pointed-to type size
11192 "arguments" prior to the pointer declaration point and the
11193 size evaluation could end up prior to the side effects. */
11199 {
11203 }
11206 {
11207 /* In C++0x, the type we are creating a reference to might be
11208 a typedef which is itself a reference type. In that case,
11209 we follow the reference collapsing rules in
11210 [7.1.3/8 dcl.typedef] to create the final reference type:
11212 "If a typedef TD names a type that is a reference to a type
11213 T, an attempt to create the type 'lvalue reference to cv TD'
11214 creates the type 'lvalue reference to T,' while an attempt
11215 to create the type "rvalue reference to cv TD' creates the
11216 type TD."
11217 */
11221 {
11224 else
11226 }
11227 else
11228 type = cp_build_reference_type
11231 /* In C++0x, we need this check for direct reference to
11232 reference declarations, which are forbidden by
11233 [8.3.2/5 dcl.ref]. Reference to reference declarations
11234 are only allowed indirectly through typedefs and template
11235 type arguments. Example:
11237 void foo(int & &); // invalid ref-to-ref decl
11239 typedef int & int_ref;
11240 void foo(int_ref &); // valid ref-to-ref decl
11241 */
11245 }
11249 {
11253 /* We will already have complained. */
11255 else
11257 type);
11258 }
11259 else
11262 /* Process a list of type modifier keywords (such as
11263 const or volatile) that were given inside the `*' or `&'. */
11266 {
11267 type
11271 }
11273 /* Apply C++11 attributes to the pointer, and not to the
11274 type pointed to. This is unlike what is done for GNU
11275 attributes above. It is to comply with [dcl.ptr]/1:
11277 [the optional attribute-specifier-seq (7.6.1) appertains
11278 to the pointer and not to the object pointed to]. */
11291 }
11292 }
11294 /* A `constexpr' specifier used in an object declaration declares
11295 the object as `const'. */
11297 {
11298 /* DR1688 says that a `constexpr' specifier in combination with
11299 `volatile' is valid. */
11302 {
11305 }
11306 }
11312 {
11314 unqualified_id);
11316 }
11318 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
11319 qualified with a class-name, turn it into a METHOD_TYPE, unless
11320 we know that the function is static. We take advantage of this
11321 opportunity to do other processing that pertains to entities
11322 explicitly declared to be class members. Note that if DECLARATOR
11323 is non-NULL, we know it is a cdk_id declarator; otherwise, we
11324 would not have exited the loop above. */
11329 {
11335 {
11337 {
11341 }
11342 else
11346 }
11348 can skip the following checks. */
11351 qualifying type must certainly be complete. */
11352 funcdef_flag
11353 /* A friend declaration of "T::f" is OK, even if
11354 "T" is a template parameter. But, if this
11355 function is not a friend, the qualifying type
11356 must be a class. */
11358 /* For a declaration, the type need not be
11359 complete, if either it is dependent (since there
11360 is no meaningful definition of complete in that
11361 case) or the qualifying class is currently being
11362 defined. */
11365 /* Check that the qualifying type is complete. */
11369 {
11372 {
11380 }
11381 }
11383 {
11387 }
11388 }
11393 /* Now TYPE has the actual type. */
11396 {
11399 else
11401 }
11407 /* [dcl.meaning]/1: The optional attribute-specifier-seq following
11408 a declarator-id appertains to the entity that is declared. */
11411 /* Handle parameter packs. */
11413 {
11415 /* Turn the type into a pack expansion.*/
11417 else
11419 }
11422 && !processing_template_decl
11424 {
11427 else
11430 }
11433 {
11434 /* [dcl.fct.spec] (C++11) The explicit specifier shall be used only
11435 in the declaration of a constructor or conversion function within
11436 a class definition. */
11443 else
11445 "only declarations of constructors and conversion operators "
11448 }
11451 {
11453 {
11456 }
11458 {
11461 }
11464 {
11467 }
11469 {
11472 }
11474 {
11477 }
11479 {
11483 }
11484 }
11486 /* If this is declaring a typedef name, return a TYPE_DECL. */
11488 {
11489 tree decl;
11491 /* This declaration:
11493 typedef void f(int) const;
11495 declares a function type which is not a member of any
11496 particular class, but which is cv-qualified; for
11497 example "f S::*" declares a pointer to a const-qualified
11498 member function of S. We record the cv-qualification in the
11499 function type. */
11501 {
11504 /* We have now dealt with these qualifiers. */
11507 }
11510 {
11513 }
11520 else
11526 }
11529 {
11533 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
11535 /* The TYPE_DECL is "abstract" because there will be
11536 clones of this constructor/destructor, and there will
11537 be copies of this TYPE_DECL generated in those
11538 clones. The decloning optimization (for space) may
11539 revert this subsequently if it determines that
11540 the clones should share a common implementation. */
11542 }
11547 unqualified_id);
11549 /* If the user declares "typedef struct {...} foo" then the
11550 struct will have an anonymous name. Fill that name in now.
11551 Nothing can refer to it, so nothing needs know about the name
11552 change. */
11554 && unqualified_id
11572 /* Acknowledge that this was written:
11573 `using analias = atype;'. */
11577 }
11579 /* Detect the case of an array type of unspecified size
11580 which came, as such, direct from a typedef name.
11581 We must copy the type, so that the array's domain can be
11582 individually set by the object's initializer. */
11589 /* Detect where we're using a typedef of function type to declare a
11590 function. PARMS will not be set, so we must create it now. */
11593 {
11595 tree args;
11600 {
11606 }
11611 {
11612 /* The qualifiers on the function type become the qualifiers on
11613 the non-static member function. */
11617 }
11618 }
11620 /* If this is a type name (such as, in a cast or sizeof),
11621 compute the type and return it now. */
11624 {
11625 /* Note that here we don't care about type_quals. */
11627 /* Special case: "friend class foo" looks like a TYPENAME context. */
11629 {
11631 {
11634 }
11637 {
11638 /* Don't allow friend declaration without a class-key. */
11645 else
11648 type);
11649 }
11651 /* Only try to do this stuff if we didn't already give up. */
11653 {
11654 /* A friendly class? */
11658 else
11660 type);
11663 }
11664 }
11666 {
11673 /* Core issue #547: need to allow this in template type args.
11674 Allow it in general in C++11 for alias-declarations. */
11678 else
11680 }
11686 }
11690 && ! bitfield
11692 {
11695 }
11698 {
11699 /* Only functions may be declared using an operator-function-id. */
11701 {
11704 }
11709 type);
11710 }
11712 /* We don't check parameter types here because we can emit a better
11713 error message later. */
11715 {
11719 }
11721 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
11722 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
11725 {
11731 {
11734 else
11737 }
11739 /* A parameter declared as an array of T is really a pointer to T.
11740 One declared as a function is really a pointer to a function.
11741 One declared as a member is really a pointer to member. */
11744 {
11745 /* Transfer const-ness of array into that of type pointed to. */
11749 }
11752 }
11757 {
11763 }
11765 {
11769 {
11776 }
11778 {
11781 {
11787 else
11791 }
11793 /* The C99 flexible array extension. */
11796 {
11800 {
11803 }
11804 else
11805 {
11806 /* Array is a flexible member. */
11808 /* Do not warn on flexible array members in system
11813 else
11817 /* Flexible array member has a null domain. */
11819 }
11820 }
11823 {
11824 /* Happens when declaring arrays of sizes which
11825 are error_mark_node, for example. */
11827 }
11829 {
11830 /* Something like struct S { int N::j; }; */
11833 }
11836 {
11838 tree function_context;
11841 {
11842 /* This should never happen in pure C++ (the check
11843 could be an assert). It could happen in
11844 Objective-C++ if someone writes invalid code that
11845 uses a function declaration for an instance
11846 variable or property (instance variables and
11847 properties are parsed as FIELD_DECLs, but they are
11848 part of an Objective-C class, not a C++ class).
11849 That code is invalid and is caught by this
11850 check. */
11852 {
11854 unqualified_id);
11856 }
11858 /* ``A union may [ ... ] not [ have ] virtual functions.''
11859 ARM 9.5 */
11861 {
11863 unqualified_id);
11865 }
11870 {
11874 }
11875 }
11877 /* Check that the name used for a destructor makes sense. */
11879 {
11883 {
11888 }
11891 {
11895 }
11897 {
11900 }
11902 {
11905 }
11906 }
11908 {
11913 }
11916 {
11919 }
11921 {
11924 }
11927 {
11930 {
11936 }
11937 }
11939 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
11951 parms,
11952 unqualified_id,
11953 reqs,
11963 #if 0
11964 /* This clobbers the attrs stored in `decl' from `attrlist'. */
11965 /* The decl and setting of decl_attr is also turned off. */
11967 #endif
11969 /* [class.conv.ctor]
11971 A constructor declared without the function-specifier
11972 explicit that can be called with a single parameter
11973 specifies a conversion from the type of its first
11974 parameter to the type of its class. Such a constructor
11975 is called a converting constructor. */
11978 }
11983 {
11986 {
11988 {
11992 }
11993 else
11998 }
11999 }
12000 else
12001 {
12003 {
12007 }
12009 }
12012 {
12013 /* Friends are treated specially. */
12017 {
12019 {
12020 decl = check_explicit_specialization
12025 }
12029 funcdef_flag);
12031 }
12032 else
12034 }
12036 /* Structure field. It may not be a function, except for C++. */
12039 {
12041 {
12042 /* C++ allows static class members. All other work
12043 for this is done by grokfield. */
12051 unqualified_id);
12053 {
12057 }
12064 /* Even if there is an in-class initialization, DECL
12065 is considered undefined until an out-of-class
12066 definition is provided, unless this is an inline
12067 variable. */
12071 {
12077 }
12078 }
12079 else
12080 {
12083 unqualified_id);
12085 {
12087 unqualified_id);
12089 }
12097 {
12100 }
12103 {
12104 /* An attempt is being made to initialize a non-static
12105 member. This is new in C++11. */
12108 /* If this has been parsed with static storage class, but
12109 errors forced staticp to be cleared, ensure NSDMI is
12110 not present. */
12113 }
12114 }
12120 }
12121 }
12124 {
12125 tree original_name;
12133 else
12135 // FIXME:gcc_assert (original_name == dname);
12142 {
12145 name);
12146 else
12148 name);
12149 }
12153 /* Function declaration not at top level.
12154 Storage classes other than `extern' are not allowed
12155 and `extern' makes no difference. */
12160 {
12163 "%<static%> specifier invalid for function %qs "
12165 else
12167 "%<inline%> specifier invalid for function %qs "
12169 }
12172 {
12174 {
12177 }
12180 {
12185 }
12186 }
12188 /* Record whether the function is public. */
12198 publicp,
12201 sfk,
12202 funcdef_flag,
12211 {
12214 /* Don't allow a static member function in a class, and forbid
12215 declaring main to be static. */
12217 {
12221 }
12223 {
12224 /* 7.1.1: There can be no static function declarations within a
12225 block. */
12228 }
12231 {
12234 }
12235 }
12236 }
12237 else
12238 {
12239 /* It's a variable. */
12241 /* An uninitialized decl with `extern' is a reference. */
12243 declspecs,
12244 initialized,
12245 type_quals,
12246 inlinep,
12247 concept_p,
12248 template_count,
12258 {
12261 {
12266 }
12268 {
12271 }
12273 {
12275 "cannot explicitly declare member %q#D to have "
12278 }
12279 }
12281 {
12283 decl);
12285 }
12290 {
12295 }
12296 }
12301 {
12305 }
12308 {
12310 {
12311 /* It's common practice (and completely valid) to have a const
12312 be initialized and declared extern. */
12315 }
12316 else
12317 {
12320 }
12321 }
12323 /* Record `register' declaration for warnings on &
12324 and in case doing stupid register allocation. */
12327 {
12329 /* Warn about register storage specifiers on PARM_DECLs. */
12331 {
12334 "ISO C++17 does not allow %<register%> storage "
12336 else
12339 }
12340 }
12346 /* Set constexpr flag on vars (functions got it in grokfndecl). */
12350 /* Record constancy and volatility on the DECL itself . There's
12351 no need to do this when processing a template; we'll do this
12352 for the instantiated declaration based on the type of DECL. */
12357 }
12358 }
12359 \f
12360 /* Subroutine of start_function. Ensure that each of the parameter
12361 types (as listed in PARMS) is complete, as is required for a
12362 function definition. */
12364 static void
12366 {
12368 {
12373 {
12379 }
12380 else
12381 /* grokparms or complete_type_or_else will have already issued
12382 an error. */
12384 }
12385 }
12387 /* Returns nonzero if T is a local variable. */
12389 int
12391 {
12393 /* A VAR_DECL with a context that is a _TYPE is a static data
12394 member. */
12396 /* Any other non-local variable must be at namespace scope. */
12402 }
12404 /* Like local_variable_p, but suitable for use as a tree-walking
12405 function. */
12407 static tree
12410 {
12418 }
12420 /* Check that ARG, which is a default-argument expression for a
12421 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
12422 something goes wrong. DECL may also be a _TYPE node, rather than a
12423 DECL, if there is no DECL available. */
12425 tree
12427 {
12428 tree var;
12429 tree decl_type;
12432 /* We get a DEFAULT_ARG when looking at an in-class declaration
12433 with a default argument. Ignore the argument for now; we'll
12434 deal with it after the class is complete. */
12438 {
12441 }
12442 else
12449 /* Something already went wrong. There's no need to check
12450 further. */
12453 /* [dcl.fct.default]
12455 A default argument expression is implicitly converted to the
12456 parameter type. */
12459 LOOKUP_IMPLICIT);
12462 /* Avoid redundant -Wzero-as-null-pointer-constant warnings at
12463 the call sites. */
12468 /* [dcl.fct.default]
12470 Local variables shall not be used in default argument
12471 expressions.
12473 The keyword `this' shall not be used in a default argument of a
12474 member function. */
12477 {
12479 {
12483 else
12485 }
12487 }
12489 /* All is well. */
12491 }
12493 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
12495 static tree
12497 {
12502 {
12505 else
12507 }
12509 /* Do warn about using typedefs to a deprecated class. */
12521 return type_is_deprecated
12525 }
12527 /* Decode the list of parameter types for a function type.
12528 Given the list of things declared inside the parens,
12529 return a list of types.
12531 If this parameter does not end with an ellipsis, we append
12532 void_list_node.
12534 *PARMS is set to the chain of PARM_DECLs created. */
12536 tree
12538 {
12541 tree parm;
12545 {
12558 {
12560 && !init
12563 /* DR 577: A parameter list consisting of a single
12564 unnamed parameter of non-dependent type 'void'. */
12568 "invalid use of cv-qualified type %qT in "
12570 else
12572 "invalid use of type %<void%> in parameter "
12574 /* It's not a good idea to actually create parameters of
12575 type `void'; other parts of the compiler assume that a
12576 void type terminates the parameter list. */
12579 }
12582 {
12584 {
12588 }
12590 /* Top-level qualifiers on the parameters are
12591 ignored for function types. */
12594 {
12598 }
12602 {
12603 /* Before C++17 DR 393:
12604 [dcl.fct]/6, parameter types cannot contain pointers
12605 (references) to arrays of unknown bound. */
12610 {
12618 }
12621 ptr
12627 }
12633 }
12638 }
12646 }
12648 \f
12649 /* D is a constructor or overloaded `operator='.
12651 Let T be the class in which D is declared. Then, this function
12652 returns:
12654 -1 if D's is an ill-formed constructor or copy assignment operator
12655 whose first parameter is of type `T'.
12656 0 if D is not a copy constructor or copy assignment
12657 operator.
12658 1 if D is a copy constructor or copy assignment operator whose
12659 first parameter is a reference to non-const qualified T.
12660 2 if D is a copy constructor or copy assignment operator whose
12661 first parameter is a reference to const qualified T.
12663 This function can be used as a predicate. Positive values indicate
12664 a copy constructor and nonzero values indicate a copy assignment
12665 operator. */
12667 int
12669 {
12670 tree args;
12671 tree arg_type;
12679 /* Instantiations of template member functions are never copy
12680 functions. Note that member functions of templated classes are
12681 represented as template functions internally, and we must
12682 accept those as copy functions. */
12694 {
12695 /* Pass by value copy assignment operator. */
12697 }
12701 {
12704 }
12705 else
12711 /* There are more non-optional args. */
12715 }
12717 /* D is a constructor or overloaded `operator='.
12719 Let T be the class in which D is declared. Then, this function
12720 returns true when D is a move constructor or move assignment
12721 operator, false otherwise. */
12723 bool
12725 {
12729 /* There are no move constructors if we are in C++98 mode. */
12735 /* Instantiations of template member functions are never move
12736 functions. Note that member functions of templated classes are
12737 represented as template functions internally, and we must
12738 accept those as move functions. */
12742 }
12744 /* D is a constructor or overloaded `operator='.
12746 Then, this function returns true when D has the same signature as a move
12747 constructor or move assignment operator (because either it is such a
12748 ctor/op= or it is a template specialization with the same signature),
12749 false otherwise. */
12751 bool
12753 {
12754 tree args;
12755 tree arg_type;
12775 /* There are more non-optional args. */
12779 }
12781 /* Remember any special properties of member function DECL. */
12783 void
12785 {
12786 tree class_type;
12793 {
12800 {
12801 /* [class.copy]
12803 A non-template constructor for class X is a copy
12804 constructor if its first parameter is of type X&, const
12805 X&, volatile X& or const volatile X&, and either there
12806 are no other parameters or else all other parameters have
12807 default arguments. */
12813 }
12824 }
12826 {
12827 /* [class.copy]
12829 A non-template assignment operator for class X is a copy
12830 assignment operator if its parameter is of type X, X&, const
12831 X&, volatile X& or const volatile X&. */
12836 {
12842 }
12845 }
12849 /* Destructors are handled in check_methods. */
12850 }
12852 /* Check a constructor DECL has the correct form. Complains
12853 if the class has a constructor of the form X(X). */
12855 bool
12857 {
12861 {
12862 /* [class.copy]
12864 A declaration of a constructor for a class X is ill-formed if
12865 its first parameter is of type (optionally cv-qualified) X
12866 and either there are no other parameters or else all other
12867 parameters have default arguments.
12869 We *don't* complain about member template instantiations that
12870 have this form, though; they can occur as we try to decide
12871 what constructor to use during overload resolution. Since
12872 overload resolution will never prefer such a constructor to
12873 the non-template copy constructor (which is either explicitly
12874 or implicitly defined), there's no need to worry about their
12875 existence. Theoretically, they should never even be
12876 instantiated, but that's hard to forestall. */
12880 }
12883 }
12885 /* DECL is a declaration for an overloaded or conversion operator. If
12886 COMPLAIN is true, errors are issued for invalid declarations. */
12888 bool
12890 {
12899 tree_code operator_code;
12902 {
12903 /* Conversion operators are TYPE_EXPR for the purposes of this
12904 function. */
12907 }
12908 else
12909 {
12916 }
12919 {
12920 /* operator new and operator delete are quite special. */
12923 {
12942 }
12944 /* [basic.std.dynamic.allocation]/1:
12946 A program is ill-formed if an allocation function is declared
12947 in a namespace scope other than global scope or declared
12948 static in global scope.
12950 The same also holds true for deallocation functions. */
12952 {
12954 {
12957 }
12960 {
12963 }
12964 }
12968 else
12969 {
12972 }
12975 }
12977 /* An operator function must either be a non-static member function
12978 or have at least one parameter of a class, a reference to a class,
12979 an enumeration, or a reference to an enumeration. 13.4.0.6 */
12981 {
12987 {
12990 }
12993 {
12997 }
13000 {
13002 {
13007 }
13013 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
13014 because these checks are performed even on template
13015 functions. */
13019 }
13020 }
13023 /* There are no further restrictions on the arguments to an overloaded
13024 "operator ()". */
13028 {
13029 /* 13.4.0.3 */
13032 }
13034 /* Count the number of arguments and check for ellipsis. */
13037 {
13039 {
13040 /* Variadic. */
13043 }
13045 }
13047 /* Verify correct number of arguments. */
13049 {
13052 {
13053 /* We have a unary instance of an ambi-ary op. Remap to the
13054 unary one. */
13060 }
13062 {
13063 /* This was an ambiguous operator but is invalid. */
13068 }
13071 && ! processing_template_decl
13072 /* x++ and x--'s second argument must be an int. */
13074 integer_type_node))
13075 {
13079 decl);
13081 }
13086 {
13091 }
13096 {
13101 }
13106 }
13108 /* There can be no default arguments. */
13111 {
13117 else
13118 {
13121 }
13122 }
13124 /* At this point the declaration is well-formed. It may not be
13125 sensible though. */
13127 /* Check member function warnings only on the in-class declaration.
13128 There's no point warning on an out-of-class definition. */
13132 /* Warn about conversion operators that will never be used. */
13136 {
13145 ref
13151 {
13154 ref
13159 /* Don't force t to be complete here. */
13164 ref
13169 }
13170 }
13175 /* Effective C++ rules below. */
13177 /* More Effective C++ rule 7. */
13184 /* More Effective C++ rule 6. */
13189 {
13198 {
13203 }
13204 else
13205 {
13208 }
13209 }
13211 /* Effective C++ rule 23. */
13222 }
13223 \f
13224 /* Return a string giving the keyword associate with CODE. */
13228 {
13230 {
13243 }
13244 }
13246 /* Name lookup in an elaborated-type-specifier (after the keyword
13247 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
13248 elaborated-type-specifier is invalid, issue a diagnostic and return
13249 error_mark_node; otherwise, return the *_TYPE to which it referred.
13250 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
13252 tree
13254 tree decl,
13256 {
13257 tree type;
13259 /* In the case of:
13261 struct S { struct S *p; };
13263 name lookup will find the TYPE_DECL for the implicit "S::S"
13264 typedef. Adjust for that here. */
13270 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
13271 is false for this case as well. */
13273 {
13277 }
13278 /* Accept template template parameters. */
13282 ;
13283 /* [dcl.type.elab]
13285 If the identifier resolves to a typedef-name or the
13286 simple-template-id resolves to an alias template
13287 specialization, the elaborated-type-specifier is ill-formed.
13289 In other words, the only legitimate declaration to use in the
13290 elaborated type specifier is the implicit typedef created when
13291 the type is declared. */
13295 {
13299 else
13304 }
13309 {
13313 }
13316 {
13320 }
13324 {
13325 /* If a class template appears as elaborated type specifier
13326 without a template header such as:
13328 template <class T> class C {};
13329 void f(class C); // No template header here
13331 then the required template argument is missing. */
13336 }
13339 }
13341 /* Lookup NAME in elaborate type specifier in scope according to
13342 SCOPE and issue diagnostics if necessary.
13343 Return *_TYPE node upon success, NULL_TREE when the NAME is not
13344 found, and ERROR_MARK_NODE for type error. */
13346 static tree
13349 {
13350 tree t;
13351 tree decl;
13353 {
13354 /* First try ordinary name lookup, ignoring hidden class name
13355 injected via friend declaration. */
13358 /* If that fails, the name will be placed in the smallest
13359 non-class, non-function-prototype scope according to 3.3.1/5.
13360 We may already have a hidden name declared as friend in this
13361 scope. So lookup again but not ignoring hidden names.
13362 If we find one, that name will be made visible rather than
13363 creating a new tag. */
13366 }
13367 else
13372 /* If scope is ts_current we're defining a class, so ignore a
13373 template template parameter. */
13379 {
13380 /* Look for invalid nested type:
13381 class C {
13382 class C {};
13383 }; */
13385 {
13388 decl);
13390 }
13392 /* Two cases we need to consider when deciding if a class
13393 template is allowed as an elaborated type specifier:
13394 1. It is a self reference to its own class.
13395 2. It comes with a template header.
13397 For example:
13399 template <class T> class C {
13400 class C *c1; // DECL_SELF_REFERENCE_P is true
13401 class D;
13402 };
13403 template <class U> class C; // template_header_p is true
13404 template <class T> class C<T>::D {
13405 class C *c2; // DECL_SELF_REFERENCE_P is true
13406 }; */
13409 decl,
13410 template_header_p
13415 {
13424 }
13427 }
13429 {
13433 }
13434 else
13436 }
13438 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
13439 Define the tag as a forward-reference if it is not defined.
13441 If a declaration is given, process it here, and report an error if
13442 multiple declarations are not identical.
13444 SCOPE is TS_CURRENT when this is also a definition. Only look in
13445 the current frame for the name (since C++ allows new names in any
13446 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
13447 declaration. Only look beginning from the current scope outward up
13448 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
13450 TEMPLATE_HEADER_P is true when this declaration is preceded by
13451 a set of template parameters. */
13453 static tree
13456 {
13463 {
13476 }
13478 /* In case of anonymous name, xref_tag is only called to
13479 make type node and push name. Name lookup is not required. */
13490 {
13494 /* Since SCOPE is not TS_CURRENT, we are not looking at a
13495 definition of this tag. Since, in addition, we are currently
13496 processing a (member) template declaration of a template
13497 class, we must be very careful; consider:
13499 template <class X>
13500 struct S1
13502 template <class U>
13503 struct S2
13504 { template <class V>
13505 friend struct S1; };
13507 Here, the S2::S1 declaration should not be confused with the
13508 outer declaration. In particular, the inner version should
13509 have a template parameter of level 2, not level 1. This
13510 would be particularly important if the member declaration
13511 were instead:
13513 template <class V = U> friend struct S1;
13515 say, when we should tsubst into `U' when instantiating
13516 S2. On the other hand, when presented with:
13518 template <class T>
13519 struct S1 {
13520 template <class U>
13521 struct S2 {};
13522 template <class U>
13523 friend struct S2;
13524 };
13526 we must find the inner binding eventually. We
13527 accomplish this by making sure that the new type we
13528 create to represent this declaration has the right
13529 TYPE_CONTEXT. */
13532 }
13535 {
13536 /* If no such tag is yet defined, create a forward-reference node
13537 and record it as the "definition".
13538 When a real declaration of this type is found,
13539 the forward-reference will be altered into a real type. */
13541 {
13544 }
13545 else
13546 {
13550 /* Mark it as a lambda type. */
13553 }
13554 }
13555 else
13556 {
13558 {
13559 /* Check that we aren't trying to overload a class with different
13560 constraints. */
13563 {
13566 }
13569 }
13573 {
13577 }
13579 /* Make injected friend class visible. */
13581 {
13588 {
13592 }
13593 }
13594 }
13597 }
13599 /* Wrapper for xref_tag_1. */
13601 tree
13604 {
13605 tree ret;
13611 }
13614 tree
13616 {
13621 else
13628 }
13630 /* Create the binfo hierarchy for REF with (possibly NULL) base list
13631 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
13632 access_* node, and the TREE_VALUE is the type of the base-class.
13633 Non-NULL TREE_TYPE indicates virtual inheritance. */
13635 void
13637 {
13644 tree default_access;
13650 /* The base of a derived class is private by default, all others are
13651 public. */
13656 /* First, make sure that any templates in base-classes are
13657 instantiated. This ensures that if we call ourselves recursively
13658 we do not get confused about which classes are marked and which
13659 are not. */
13662 {
13665 /* The dependent_type_p call below should really be dependent_scope_p
13666 so that we give a hard error about using an incomplete type as a
13667 base, but we allow it with a pedwarn for backward
13668 compatibility. */
13674 /* An incomplete type. Remove it from the list. */
13676 else
13677 {
13678 max_bases++;
13680 max_dvbases++;
13684 }
13685 }
13690 /* The binfo slot should be empty, unless this is an (ill-formed)
13691 redefinition. */
13702 /* Apply base-class info set up to the variants of this type. */
13706 {
13708 /* A C++98 POD cannot have base classes. */
13713 }
13720 {
13721 /* An aggregate can't have virtual base classes. */
13729 }
13732 {
13740 /* Before C++17, an aggregate cannot have base classes. In C++17, an
13741 aggregate can't have virtual, private, or protected base classes. */
13752 {
13754 basetype);
13756 }
13760 {
13762 /* The original basetype could have been a typedef'd type. */
13765 /* Inherit flags from the base. */
13776 }
13778 /* We must do this test after we've seen through a typedef
13779 type. */
13781 {
13784 else
13787 }
13790 /* Regenerate the pack expansion for the bases. */
13804 dropped_base:
13805 /* Update max_vbases to reflect the reality that we are dropping
13806 this base: if it reaches zero we want to undo the vec_alloc
13807 above to avoid inconsistencies during error-recovery: eg, in
13808 build_special_member_call, CLASSTYPE_VBASECLASSES non null
13809 and vtt null (c++/27952). */
13811 max_vbases--;
13813 max_vbases
13815 }
13822 /* If we didn't get max_vbases vbases, we must have shared at
13823 least one of them, and are therefore diamond shaped. */
13826 /* Unmark all the types. */
13831 /* Now see if we have a repeated base type. */
13833 {
13836 {
13838 {
13841 }
13843 }
13848 else
13850 }
13851 }
13853 \f
13854 /* Copies the enum-related properties from type SRC to type DST.
13855 Used with the underlying type of an enum and the enum itself. */
13856 static void
13858 {
13859 tree t;
13861 {
13871 else
13875 }
13876 }
13878 /* Begin compiling the definition of an enumeration type.
13879 NAME is its name,
13881 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
13883 UNDERLYING_TYPE is the type that will be used as the storage for
13884 the enumeration type. This should be NULL_TREE if no storage type
13885 was specified.
13887 ATTRIBUTES are any attributes specified after the enum-key.
13889 SCOPED_ENUM_P is true if this is a scoped enumeration type.
13891 if IS_NEW is not NULL, gets TRUE iff a new type is created.
13893 Returns the type object, as yet incomplete.
13894 Also records info about it so that build_enumerator
13895 may be used to declare the individual values as they are read. */
13897 tree
13900 {
13906 /* [C++0x dcl.enum]p5:
13908 If not explicitly specified, the underlying type of a scoped
13909 enumeration type is int. */
13916 /* If this is the real definition for a previous forward reference,
13917 fill in the contents in the same object that used to be the
13918 forward reference. */
13924 /* In case of a template_decl, the only check that should be deferred
13925 to instantiation time is the comparison of underlying types. */
13927 {
13929 {
13935 }
13937 {
13943 }
13949 {
13955 }
13956 }
13960 {
13961 /* In case of error, make a dummy enum to allow parsing to
13962 continue. */
13964 {
13967 }
13969 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
13970 of an opaque enum, or an opaque enum of an already defined
13971 enumeration (C++0x only).
13972 In any other case, it'll be NULL_TREE. */
13974 {
13977 }
13980 /* Do not push the decl more than once, unless we need to
13981 compare underlying types at instantiation time */
13984 || (underlying_type
13988 {
13992 /* std::byte aliases anything. */
13997 }
13998 else
14005 /* The enum is considered opaque until the opening '{' of the
14006 enumerator list. */
14009 }
14016 {
14018 /* We already checked that it matches, don't change it to a different
14021 {
14024 }
14027 else
14030 }
14032 /* If into a template class, the returned enum is always the first
14033 declaration (opaque or not) seen. This way all the references to
14034 this type will be to the same declaration. The following ones are used
14035 only to check for definition errors. */
14038 else
14040 }
14042 /* After processing and defining all the values of an enumeration type,
14043 install their decls in the enumeration type.
14044 ENUMTYPE is the type object. */
14046 void
14048 {
14049 tree values;
14050 tree underlying_type;
14051 tree decl;
14052 tree value;
14054 tree t;
14056 bool fixed_underlying_type_p
14059 /* We built up the VALUES in reverse order. */
14062 /* For an enum defined in a template, just set the type of the values;
14063 all further processing is postponed until the template is
14064 instantiated. We need to set the type so that tsubst of a CONST_DECL
14065 works. */
14067 {
14069 values;
14073 }
14075 /* Determine the minimum and maximum values of the enumerators. */
14077 {
14081 values;
14083 {
14086 /* [dcl.enum]: Following the closing brace of an enum-specifier,
14087 each enumerator has the type of its enumeration. Prior to the
14088 closing brace, the type of each enumerator is the type of its
14089 initializing value. */
14092 /* Update the minimum and maximum values, if appropriate. */
14096 /* Figure out what the minimum and maximum values of the
14097 enumerators are. */
14104 }
14105 }
14106 else
14107 /* [dcl.enum]
14109 If the enumerator-list is empty, the underlying type is as if
14110 the enumeration had a single enumerator with value 0. */
14114 {
14115 /* Compute the number of bits require to represent all values of the
14116 enumeration. We must do this before the type of MINNODE and
14117 MAXNODE are transformed, since tree_int_cst_min_precision relies
14118 on the TREE_TYPE of the value it is passed. */
14126 /* Determine the underlying type of the enumeration.
14128 [dcl.enum]
14130 The underlying type of an enumeration is an integral type that
14131 can represent all the enumerator values defined in the
14132 enumeration. It is implementation-defined which integral type is
14133 used as the underlying type for an enumeration except that the
14134 underlying type shall not be larger than int unless the value of
14135 an enumerator cannot fit in an int or unsigned int.
14137 We use "int" or an "unsigned int" as the underlying type, even if
14138 a smaller integral type would work, unless the user has
14139 explicitly requested that we use the smallest possible type. The
14140 user can request that for all enumerations with a command line
14141 flag, or for just one enumeration with an attribute. */
14143 use_short_enum = flag_short_enums
14146 /* If the precision of the type was specified with an attribute and it
14147 was too small, give an error. Otherwise, use it. */
14149 {
14152 else
14153 {
14156 }
14157 }
14161 itk++)
14162 {
14168 }
14170 {
14171 /* DR 377
14173 IF no integral type can represent all the enumerator values, the
14174 enumeration is ill-formed. */
14179 }
14181 /* [dcl.enum]
14183 The value of sizeof() applied to an enumeration type, an object
14184 of an enumeration type, or an enumerator, is the value of sizeof()
14185 applied to the underlying type. */
14188 /* Compute the minimum and maximum values for the type.
14190 [dcl.enum]
14192 For an enumeration where emin is the smallest enumerator and emax
14193 is the largest, the values of the enumeration are the values of the
14194 underlying type in the range bmin to bmax, where bmin and bmax are,
14195 respectively, the smallest and largest values of the smallest bit-
14196 field that can store emin and emax. */
14198 /* The middle-end currently assumes that types with TYPE_PRECISION
14199 narrower than their underlying type are suitably zero or sign
14200 extended to fill their mode. Similarly, it assumes that the front
14201 end assures that a value of a particular type must be within
14202 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
14204 We used to set these fields based on bmin and bmax, but that led
14205 to invalid assumptions like optimizing away bounds checking. So
14206 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
14207 TYPE_MAX_VALUE to the values for the mode above and only restrict
14208 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
14212 set_min_and_max_values_for_integral_type
14215 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
14218 }
14219 else
14222 /* Convert each of the enumerators to the type of the underlying
14223 type of the enumeration. */
14225 {
14226 location_t saved_location;
14232 /* If the enumeration type has a fixed underlying type, we
14233 already checked all of the enumerator values. */
14235 else
14238 tf_warning_or_error);
14241 /* Do not clobber shared ints. */
14243 {
14247 }
14249 }
14251 /* Fix up all variant types of this enum type. */
14258 {
14260 /* TYPE_FIELDS needs fixup. */
14262 }
14264 /* Finish debugging output for this type. */
14267 /* Each enumerator now has the type of its enumeration. Clear the cache
14268 so that this change in types doesn't confuse us later on. */
14270 }
14272 /* Finishes the enum type. This is called only the first time an
14273 enumeration is seen, be it opaque or odinary.
14274 ENUMTYPE is the type object. */
14276 void
14278 {
14280 {
14284 }
14286 /* If this is a forward declaration, there should not be any variants,
14287 though we can get a variant in the middle of an enum-specifier with
14288 wacky code like 'enum E { e = sizeof(const E*) };' */
14292 }
14294 /* Build and install a CONST_DECL for an enumeration constant of the
14295 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
14296 Apply ATTRIBUTES if available. LOC is the location of NAME.
14297 Assignment of sequential values by default is handled here. */
14299 void
14301 location_t loc)
14302 {
14303 tree decl;
14304 tree context;
14305 tree type;
14307 /* scalar_constant_value will pull out this expression, so make sure
14308 it's folded as appropriate. */
14312 /* If the VALUE was erroneous, pretend it wasn't there; that will
14313 result in the enum being assigned the next value in sequence. */
14317 /* Remove no-op casts from the value. */
14322 {
14323 /* Validate and default VALUE. */
14325 {
14327 {
14332 }
14335 value = perform_implicit_conversion_flags
14343 {
14346 {
14350 }
14351 else
14352 {
14356 {
14360 }
14361 }
14362 }
14363 }
14365 /* Default based on previous value. */
14367 {
14369 {
14370 tree prev_value;
14373 /* C++03 7.2/4: If no initializer is specified for the first
14374 enumerator, the type is an unspecified integral
14375 type. Otherwise the type is the same as the type of the
14376 initializing value of the preceding enumerator unless the
14377 incremented value is not representable in that type, in
14378 which case the type is an unspecified integral type
14379 sufficient to contain the incremented value. */
14383 else
14384 {
14390 {
14393 {
14396 {
14402 }
14409 }
14412 else
14414 }
14417 {
14420 }
14421 }
14422 }
14423 else
14425 }
14427 /* Remove no-op casts from the value. */
14430 /* If the underlying type of the enum is fixed, check whether
14431 the enumerator values fits in the underlying type. If it
14432 does not fit, the program is ill-formed [C++0x dcl.enum]. */
14434 && value
14436 {
14441 /* Convert the value to the appropriate type. */
14443 }
14444 }
14446 /* C++ associates enums with global, function, or class declarations. */
14449 /* Build the actual enumeration constant. Note that the enumeration
14450 constants have the underlying type of the enum (if it is fixed)
14451 or the type of their initializer (if the underlying type of the
14452 enum is not fixed):
14454 [ C++0x dcl.enum ]
14456 If the underlying type is fixed, the type of each enumerator
14457 prior to the closing brace is the underlying type; if the
14458 initializing value of an enumerator cannot be represented by
14459 the underlying type, the program is ill-formed. If the
14460 underlying type is not fixed, the type of each enumerator is
14461 the type of its initializing value.
14463 If the underlying type is not fixed, it will be computed by
14464 finish_enum and we will reset the type of this enumerator. Of
14465 course, if we're processing a template, there may be no value. */
14479 {
14480 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
14481 on the TYPE_FIELDS list for `S'. (That's so that you can say
14482 things like `S::i' later.) */
14484 /* The enumerator may be getting declared outside of its enclosing
14485 class, like so:
14487 class S { public: enum E : int; }; enum S::E : int { i = 7; };
14489 For which case we need to make sure that the access of `S::i'
14490 matches the access of `S::E'. */
14496 else
14502 }
14503 else
14506 /* Add this enumeration constant to the list for this type. */
14508 }
14510 /* Look for an enumerator with the given NAME within the enumeration
14511 type ENUMTYPE. This routine is used primarily for qualified name
14512 lookup into an enumerator in C++0x, e.g.,
14514 enum class Color { Red, Green, Blue };
14516 Color color = Color::Red;
14518 Returns the value corresponding to the enumerator, or
14519 NULL_TREE if no such enumerator was found. */
14520 tree
14522 {
14523 tree e;
14528 }
14530 \f
14531 /* We're defining DECL. Make sure that its type is OK. */
14533 static void
14535 {
14539 /* In a function definition, arg types must be complete. */
14546 {
14551 /* Make it return void instead. */
14554 void_type_node,
14556 else
14558 fntype
14561 fntype = (cp_build_type_attribute_variant
14564 }
14565 else
14566 {
14570 }
14571 }
14573 /* True iff FN is an implicitly-defined default constructor. */
14575 static bool
14577 {
14581 }
14583 /* Clobber the contents of *this to let the back end know that the object
14584 storage is dead when we enter the constructor or leave the destructor. */
14586 static tree
14588 {
14589 /* Clobbering an empty base is pointless, and harmful if its one byte
14590 TYPE_SIZE overlays real data. */
14594 /* If we have virtual bases, clobber the whole object, but only if we're in
14595 charge. If we don't have virtual bases, clobber the as-base type so we
14596 don't mess with tail padding. */
14608 {
14611 }
14618 }
14620 /* Create the FUNCTION_DECL for a function definition.
14621 DECLSPECS and DECLARATOR are the parts of the declaration;
14622 they describe the function's name and the type it returns,
14623 but twisted together in a fashion that parallels the syntax of C.
14625 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
14626 DECLARATOR is really the DECL for the function we are about to
14627 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
14628 indicating that the function is an inline defined in-class.
14630 This function creates a binding context for the function body
14631 as well as setting up the FUNCTION_DECL in current_function_decl.
14633 For C++, we must first check whether that datum makes any sense.
14634 For example, "class A local_a(1,2);" means that variable local_a
14635 is an aggregate of type A, which should have a constructor
14636 applied to it with the argument list [1, 2].
14638 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
14639 or may be a BLOCK if the function has been defined previously
14640 in this translation unit. On exit, DECL_INITIAL (decl1) will be
14641 error_mark_node if the function has never been defined, or
14642 a BLOCK if the function has been defined somewhere. */
14644 bool
14646 {
14648 tree fntype;
14649 tree restype;
14652 tree current_function_parms;
14657 /* Sanity check. */
14665 /* ISO C++ 11.4/5. A friend function defined in a class is in
14666 the (lexical) scope of the class in which it is defined. */
14668 {
14671 /* CTYPE could be null here if we're dealing with a template;
14672 for example, `inline friend float foo()' inside a template
14673 will have no CTYPE set. */
14676 else
14678 }
14685 /* Handle gnu_inline attribute. */
14687 {
14692 }
14695 /* This is a constructor, we must ensure that any default args
14696 introduced by this definition are propagated to the clones
14697 now. The clones are used directly in overload resolution. */
14700 /* Sometimes we don't notice that a function is a static member, and
14701 build a METHOD_TYPE for it. Fix that up now. */
14705 /* Set up current_class_type, and enter the scope of the class, if
14706 appropriate. */
14712 /* Now that we have entered the scope of the class, we must restore
14713 the bindings for any template parameters surrounding DECL1, if it
14714 is an inline member template. (Order is important; consider the
14715 case where a template parameter has the same name as a field of
14716 the class.) It is not until after this point that
14717 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
14721 /* Effective C++ rule 15. */
14729 /* Make the init_value nonzero so pushdecl knows this is not tentative.
14730 error_mark_node is replaced below (in poplevel) with the BLOCK. */
14734 /* This function exists in static storage.
14735 (This does not mean `static' in the C sense!) */
14738 /* We must call push_template_decl after current_class_type is set
14739 up. (If we are processing inline definitions after exiting a
14740 class scope, current_class_type will be NULL_TREE until set above
14741 by push_nested_class.) */
14743 {
14746 {
14750 }
14752 }
14754 /* Make sure the parameter and return types are reasonable. When
14755 you declare a function, these types can be incomplete, but they
14756 must be complete when you define the function. */
14759 /* Build the return declaration for the function. */
14763 {
14764 tree resdecl;
14772 }
14774 /* Record the decl so that the function name is defined.
14775 If we already have a decl for this name, and it is a FUNCTION_DECL,
14776 use the old decl. */
14778 {
14779 /* A specialization is not used to guide overload resolution. */
14783 {
14787 /* If something went wrong when registering the declaration,
14788 use DECL1; we have to have a FUNCTION_DECL to use when
14789 parsing the body of the function. */
14790 ;
14791 else
14792 {
14793 /* Otherwise, OLDDECL is either a previous declaration
14794 of the same function or DECL1 itself. */
14801 {
14802 tree context;
14804 /* Check whether DECL1 is in an anonymous
14805 namespace. */
14807 context;
14809 {
14813 }
14817 OPT_Wmissing_declarations,
14819 }
14822 }
14823 }
14824 else
14825 {
14826 /* We need to set the DECL_CONTEXT. */
14829 }
14833 /* If #pragma weak applies, mark the decl appropriately now.
14834 The pragma only applies to global functions. Because
14835 determining whether or not the #pragma applies involves
14836 computing the mangled name for the declaration, we cannot
14837 apply the pragma until after we have merged this declaration
14838 with any previous declarations; if the original declaration
14839 has a linkage specification, that specification applies to
14840 the definition as well, and may affect the mangled name. */
14843 }
14845 /* We are now in the scope of the function being defined. */
14848 /* Save the parm names or decls from this function's declarator
14849 where store_parm_decls will find them. */
14852 /* Let the user know we're compiling this function. */
14857 /* This function may already have been parsed, in which case just
14858 return; our caller will skip over the body without parsing. */
14862 /* Initialize RTL machinery. We cannot do this until
14863 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
14864 even when processing a template; this is how we get
14865 CFUN set up, and our per-function variables initialized.
14866 FIXME factor out the non-RTL stuff. */
14870 /* Initialize the language data structures. Whenever we start
14871 a new function, we destroy temporaries in the usual way. */
14877 {
14880 }
14882 /* Start the statement-tree, start the tree now. */
14885 /* If we are (erroneously) defining a function that we have already
14886 defined before, wipe out what we knew before. */
14891 {
14892 /* We know that this was set up by `grokclassfn'. We do not
14893 wait until `store_parm_decls', since evil parse errors may
14894 never get us to that point. Here we keep the consistency
14895 between `current_class_type' and `current_class_ptr'. */
14901 cp_function_chain->x_current_class_ref
14903 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
14906 /* Constructors and destructors need to know whether they're "in
14907 charge" of initializing virtual base classes. */
14910 {
14913 }
14915 {
14918 }
14919 }
14922 /* Implicitly-defined methods (like the
14923 destructor for a class in which no destructor
14924 is explicitly declared) must not be defined
14925 until their definition is needed. So, we
14926 ignore interface specifications for
14927 compiler-generated functions. */
14933 {
14940 /* This is a function in a local class in an extern inline
14941 or template function. */
14943 }
14944 /* If this function belongs to an interface, it is public.
14945 If it belongs to someone else's interface, it is also external.
14946 This only affects inlines and template instantiations. */
14948 {
14951 {
14955 && ! flag_implement_inlines
14958 /* For WIN32 we also want to put these in linkonce sections. */
14960 }
14961 else
14964 /* If this function is in an interface implemented in this file,
14965 make sure that the back end knows to emit this function
14966 here. */
14969 }
14972 {
14973 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
14974 interface, we will have both finfo->interface_unknown and
14975 finfo->interface_only set. In that case, we don't want to
14976 use the normal heuristics because someone will supply a
14977 #pragma implementation elsewhere, and deducing it here would
14978 produce a conflict. */
14983 }
14984 else
14985 {
14986 /* This is a definition, not a reference.
14987 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
14995 else
14997 }
14999 /* Determine the ELF visibility attribute for the function. We must not
15000 do this before calling "pushdecl", as we must allow "duplicate_decls"
15001 to merge any attributes appropriately. We also need to wait until
15002 linkage is set. */
15016 {
15019 }
15029 /* Clobbering an empty base is harmful if it overlays real data. */
15031 /* We can't clobber safely for an implicitly-defined default constructor
15032 because part of the initialization might happen before we enter the
15033 constructor, via AGGR_INIT_ZERO_FIRST (c++/68006). */
15047 }
15050 /* Like start_preparsed_function, except that instead of a
15051 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
15053 Returns true on success. If the DECLARATOR is not suitable
15054 for a function, we return false, which tells the parser to
15055 skip the entire function. */
15057 bool
15060 tree attrs)
15061 {
15062 tree decl1;
15068 /* If the declarator is not suitable for a function definition,
15069 cause a syntax error. */
15071 {
15074 }
15077 /* main must return int. grokfndecl should have corrected it
15078 (and issued a diagnostic) if the user got it wrong. */
15080 integer_type_node));
15083 }
15084 \f
15085 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
15086 FN. */
15088 static bool
15090 {
15092 && !processing_template_decl
15094 /* We insert the EH_SPEC_BLOCK only in the original
15095 function; then, it is copied automatically to the
15096 clones. */
15098 /* Implicitly-generated constructors and destructors have
15099 exception specifications. However, those specifications
15100 are the union of the possible exceptions specified by the
15101 constructors/destructors for bases and members, so no
15102 unallowed exception will ever reach this function. By
15103 not creating the EH_SPEC_BLOCK we save a little memory,
15104 and we avoid spurious warnings about unreachable
15105 code. */
15107 }
15109 /* Store the parameter declarations into the current function declaration.
15110 This is called after parsing the parameter declarations, before
15111 digesting the body of the function.
15113 Also install to binding contour return value identifier, if any. */
15115 static void
15117 {
15119 tree parm;
15121 /* This is a chain of any other decls that came in among the parm
15122 declarations. If a parm is declared with enum {foo, bar} x;
15123 then CONST_DECLs for foo and bar are put here. */
15127 {
15128 /* This case is when the function was defined with an ANSI prototype.
15129 The parms already have decls, so we need not do anything here
15130 except record them as in effect
15131 and complain if any redundant old-style parm decls were written. */
15134 tree next;
15136 /* Must clear this because it might contain TYPE_DECLs declared
15137 at class level. */
15140 /* If we're doing semantic analysis, then we'll call pushdecl
15141 for each of these. We must do them in reverse order so that
15142 they end in the correct forward order. */
15146 {
15150 else
15151 {
15152 /* If we find an enum constant or a type tag,
15153 put it aside for the moment. */
15156 }
15157 }
15159 /* Get the decls in their original chain order and record in the
15160 function. This is all and only the PARM_DECLs that were
15161 pushed into scope by the loop above. */
15163 }
15164 else
15167 /* Now store the final chain of decls for the arguments
15168 as the decl-chain of the current lexical scope.
15169 Put the enumerators in as well, at the front so that
15170 DECL_ARGUMENTS is not modified. */
15175 }
15177 \f
15178 /* We have finished doing semantic analysis on DECL, but have not yet
15179 generated RTL for its body. Save away our current state, so that
15180 when we want to generate RTL later we know what to do. */
15182 static void
15184 {
15187 /* Save the language-specific per-function data so that we can
15188 get it back when we really expand this function. */
15191 /* Make a copy. */
15196 /* Clear out the bits we don't need. */
15201 }
15204 /* Set the return value of the constructor (if present). */
15206 static void
15208 {
15209 tree val;
15210 tree exprstmt;
15213 {
15214 /* Any return from a constructor will end up here. */
15220 /* Return the address of the object. */
15223 }
15224 }
15226 /* Do all the processing for the beginning of a destructor; set up the
15227 vtable pointers and cleanups for bases and members. */
15229 static void
15231 {
15232 tree compound_stmt;
15234 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
15235 issued an error message. We still want to try to process the
15236 body of the function, but initialize_vtbl_ptrs will crash if
15237 TYPE_BINFO is NULL. */
15239 {
15241 /* Make all virtual function table pointers in non-virtual base
15242 classes point to CURRENT_CLASS_TYPE's virtual function
15243 tables. */
15248 /* Clobbering an empty base is harmful if it overlays real data. */
15252 /* And insert cleanups for our bases and members so that they
15253 will be properly destroyed if we throw. */
15255 }
15256 }
15258 /* At the end of every destructor we generate code to delete the object if
15259 necessary. Do that now. */
15261 static void
15263 {
15264 tree exprstmt;
15266 /* Any return from a destructor will end up here; that way all base
15267 and member cleanups will be run when the function returns. */
15271 {
15272 tree val;
15277 /* Return the address of the object. */
15280 }
15281 }
15283 /* Do the necessary processing for the beginning of a function body, which
15284 in this case includes member-initializers, but not the catch clauses of
15285 a function-try-block. Currently, this means opening a binding level
15286 for the member-initializers (in a ctor), member cleanups (in a dtor),
15287 and capture proxies (in a lambda operator()). */
15289 tree
15291 {
15292 tree stmt;
15299 else
15300 /* Always keep the BLOCK node associated with the outermost pair of
15301 curly braces of a function. These are needed for correct
15302 operation of dwarfout.c. */
15313 }
15315 /* Do the processing for the end of a function body. Currently, this means
15316 closing out the cleanups for fully-constructed bases and members, and in
15317 the case of the destructor, deleting the object if desired. Again, this
15318 is only meaningful for [cd]tors, since they are the only functions where
15319 there is a significant distinction between the main body and any
15320 function catch clauses. Handling, say, main() return semantics here
15321 would be wrong, as flowing off the end of a function catch clause for
15322 main() would also need to return 0. */
15324 void
15326 {
15330 /* Close the block. */
15339 }
15341 /* Given a function, returns the BLOCK corresponding to the outermost level
15342 of curly braces, skipping the artificial block created for constructor
15343 initializers. */
15345 tree
15347 {
15357 }
15359 /* If FNDECL is a class's key method, add the class to the list of
15360 keyed classes that should be emitted. */
15362 static void
15364 {
15368 {
15372 }
15373 }
15375 /* Subroutine of finish_function.
15376 Save the body of constexpr functions for possible
15377 future compile time evaluation. */
15379 static void
15381 {
15387 }
15389 /* Finish up a function declaration and compile that function
15390 all the way to assembler language output. The free the storage
15391 for the function definition. INLINE_P is TRUE if we just
15392 finished processing the body of an in-class inline function
15393 definition. (This processing will have taken place after the
15394 class definition is complete.) */
15396 tree
15398 {
15402 /* When we get some parse errors, we can end up without a
15403 current_function_decl, so cope. */
15416 /* TREE_READONLY (fndecl) = 1;
15417 This caused &foo to be of type ptr-to-const-function
15418 which then got a warning when stored in a ptr-to-function variable. */
15421 /* The current function is being defined, so its DECL_INITIAL should
15422 be set, and unless there's a multiple definition, it should be
15423 error_mark_node. */
15426 /* For a cloned function, we've already got all the code we need;
15427 there's no need to add any extra bits. */
15429 {
15430 /* Make it so that `main' always returns 0 by default. */
15437 current_eh_spec_block);
15438 }
15440 /* If we're saving up tree structure, tie off the function now. */
15448 /* If this function can't throw any exceptions, remember that. */
15451 && !flag_non_call_exceptions
15455 /* This must come after expand_function_end because cleanups might
15456 have declarations (from inline functions) that need to go into
15457 this function's blocks. */
15459 /* If the current binding level isn't the outermost binding level
15460 for this function, either there is a bug, or we have experienced
15461 syntax errors and the statement tree is malformed. */
15463 {
15464 /* Make sure we have already experienced errors. */
15467 /* Throw away the broken statement tree and extra binding
15468 levels. */
15472 {
15475 else
15477 }
15478 }
15481 /* Statements should always be full-expressions at the outermost set
15482 of curly braces for a function. */
15485 /* If there are no return statements in a function with auto return type,
15486 the return type is void. But if the declared type is something like
15487 auto*, this is an error. */
15490 {
15492 {
15495 }
15498 {
15500 current_function_auto_return_pattern);
15503 }
15504 }
15506 // If this is a concept, check that the definition is reasonable.
15510 /* Lambda closure members are implicitly constexpr if possible. */
15514 = ((processing_template_decl
15518 /* Save constexpr function body before it gets munged by
15519 the NRV transformation. */
15522 /* Invoke the pre-genericize plugin before we start munging things. */
15526 /* Perform delayed folding before NRV transformation. */
15530 /* Set up the named return value optimization, if we can. Candidate
15531 variables are selected in check_return_expr. */
15533 {
15535 tree outer;
15538 /* This is only worth doing for fns that return in memory--and
15539 simpler, since we don't have to worry about promoted modes. */
15541 /* Only allow this for variables declared in the outer scope of
15542 the function so we know that their lifetime always ends with a
15543 return; see g++.dg/opt/nrv6.C. We could be more flexible if
15544 we were to do this optimization in tree-ssa. */
15550 }
15552 /* Remember that we were in class scope. */
15556 /* Must mark the RESULT_DECL as being in this function. */
15559 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
15560 to the FUNCTION_DECL node itself. */
15563 /* Save away current state, if appropriate. */
15567 /* Complain if there's just no return statement. */
15572 /* Don't complain if we abort or throw. */
15573 && !current_function_returns_abnormally
15574 /* Don't complain if there's an infinite loop. */
15575 && !current_function_infinite_loop
15576 /* Don't complain if we are declared noreturn. */
15580 /* Structor return values (if any) are set by the compiler. */
15584 {
15588 }
15590 /* Store the end of the function, so that we get good line number
15591 info for the epilogue. */
15594 /* Complain about parameters that are only set, but never otherwise used. */
15596 && !processing_template_decl
15599 {
15600 tree decl;
15603 decl;
15617 OPT_Wunused_but_set_parameter,
15620 }
15622 /* Complain about locally defined typedefs that are not used in this
15623 function. */
15626 /* Possibly warn about unused parameters. */
15628 && !processing_template_decl
15632 /* Genericize before inlining. */
15634 {
15637 /* Clear out the bits we don't need. */
15647 }
15648 /* Clear out the bits we don't need. */
15651 /* We're leaving the context of this function, so zap cfun. It's still in
15652 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
15656 /* If this is an in-class inline definition, we may have to pop the
15657 bindings for the template parameters that we added in
15658 maybe_begin_member_template_processing when start_function was
15659 called. */
15663 /* Leave the scope of the class. */
15669 /* Clean up. */
15674 }
15675 \f
15676 /* Create the FUNCTION_DECL for a function definition.
15677 DECLSPECS and DECLARATOR are the parts of the declaration;
15678 they describe the return type and the name of the function,
15679 but twisted together in a fashion that parallels the syntax of C.
15681 This function creates a binding context for the function body
15682 as well as setting up the FUNCTION_DECL in current_function_decl.
15684 Returns a FUNCTION_DECL on success.
15686 If the DECLARATOR is not suitable for a function (it defines a datum
15687 instead), we return 0, which tells yyparse to report a parse error.
15689 May return void_type_node indicating that this method is actually
15690 a friend. See grokfield for more details.
15692 Came here with a `.pushlevel' .
15694 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
15695 CHANGES TO CODE IN `grokfield'. */
15697 tree
15700 {
15708 {
15711 }
15716 /* Pass friends other than inline friend functions back. */
15721 {
15726 }
15735 /* We process method specializations in finish_struct_1. */
15737 {
15741 }
15744 {
15746 {
15749 }
15750 }
15756 }
15757 \f
15759 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
15760 we can lay it out later, when and if its type becomes complete.
15762 Also handle constexpr variables where the initializer involves
15763 an unlowered PTRMEM_CST because the class isn't complete yet. */
15765 void
15767 {
15770 /* Keep track of variables with incomplete types. */
15773 {
15781 /* RTTI TD entries are created while defining the type_info. */
15784 {
15787 }
15791 {
15792 /* When the outermost open class is complete we can resolve any
15793 pointers-to-members. */
15797 }
15798 }
15799 }
15801 /* Called when a class type (given by TYPE) is defined. If there are
15802 any existing VAR_DECLs whose type has been completed by this
15803 declaration, update them now. */
15805 void
15807 {
15812 {
15814 {
15821 {
15822 /* Complete the type of the variable. The VAR_DECL itself
15823 will be laid out in expand_expr. */
15826 }
15828 /* Remove this entry from the list. */
15830 }
15831 else
15832 ix++;
15833 }
15835 /* Check for pending declarations which may have abstract type. */
15837 }
15839 /* If DECL is of a type which needs a cleanup, build and return an
15840 expression to perform that cleanup here. Return NULL_TREE if no
15841 cleanup need be done. DECL can also be a _REF when called from
15842 split_nonconstant_init_1. */
15844 tree
15846 {
15847 tree type;
15848 tree attr;
15849 tree cleanup;
15851 /* Assume no cleanup is required. */
15857 /* Handle "__attribute__((cleanup))". We run the cleanup function
15858 before the destructor since the destructor is what actually
15859 terminates the lifetime of the object. */
15862 else
15865 {
15866 tree id;
15867 tree fn;
15868 tree arg;
15870 /* Get the name specified by the user for the cleanup function. */
15872 /* Look up the name to find the cleanup function to call. It is
15873 important to use lookup_name here because that is what is
15874 used in c-common.c:handle_cleanup_attribute when performing
15875 initial checks on the attribute. Note that those checks
15876 include ensuring that the function found is not an overloaded
15877 function, or an object with an overloaded call operator,
15878 etc.; we can rely on the fact that the function found is an
15879 ordinary FUNCTION_DECL. */
15887 }
15888 /* Handle ordinary C++ destructors. */
15891 {
15893 tree addr;
15894 tree call;
15898 else
15909 else
15911 }
15913 /* build_delete sets the location of the destructor call to the
15914 current location, even though the destructor is going to be
15915 called later, at the end of the current scope. This can lead to
15916 a "jumpy" behavior for users of debuggers when they step around
15917 the end of the block. So let's unset the location of the
15918 destructor call instead. */
15924 /* Treat objects with destructors as used; the destructor may do
15925 something substantive. */
15930 }
15932 \f
15933 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
15934 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
15935 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
15937 tree
15939 {
15940 tree fntype;
15941 tree args;
15955 fntype = (cp_build_type_attribute_variant
15957 fntype = (build_exception_variant
15962 }
15964 /* DECL was originally constructed as a non-static member function,
15965 but turned out to be static. Update it accordingly. */
15967 void
15969 {
15982 }
15984 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
15985 one of the language-independent trees. */
15987 enum cp_tree_node_structure_enum
15989 {
15991 {
16008 }
16009 }
16011 /* Build the void_list_node (void_type_node having been created). */
16012 tree
16014 {
16017 }
16019 bool
16021 {
16022 /* A missing noreturn is ok for the `main' function. */
16024 }
16026 /* Return the decl used to identify the COMDAT group into which DECL should
16027 be placed. */
16029 tree
16031 {
16032 /* Virtual tables, construction virtual tables, and virtual table
16033 tables all go in a single COMDAT group, named after the primary
16034 virtual table. */
16037 /* For all other DECLs, the COMDAT group is the mangled name of the
16038 declaration itself. */
16039 else
16040 {
16042 {
16043 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
16044 into the same section as the target function. In that case
16045 we must return target's name. */
16051 else
16053 }
16054 }
16057 }
16059 /* Returns the return type for FN as written by the user, which may include
16060 a placeholder for a deduced return type. */
16062 tree
16064 {
16067 {
16074 }
16076 }
16078 /* Returns true iff DECL was declared with an auto type and it has
16079 not yet been deduced to a real type. */
16081 bool
16083 {
16087 }
16089 /* Complain if DECL has an undeduced return type. */
16091 bool
16093 {
16095 {
16099 }
16101 }