| blob | 5e671814d8a2a290d2ab45cdc39ac3ef9f2f69c7 |
1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988-2018 Free Software Foundation, Inc.
3 Contributed by Michael Tiemann (tiemann@cygnus.com)
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
10 any later version.
12 GCC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
22 /* Process declarations and symbol lookup for C++ front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
55 /* Possible cases of bad specifiers type used by bad_specifiers. */
60 BSP_FIELD /* field */
61 };
96 static tree check_special_function_return_type
104 /* The following symbols are subsumed in the cp_global_trees array, and
105 listed here individually for documentation purposes.
107 C++ extensions
108 tree wchar_decl_node;
110 tree vtable_entry_type;
111 tree delta_type_node;
112 tree __t_desc_type_node;
114 tree class_type_node;
115 tree unknown_type_node;
117 Array type `vtable_entry_type[]'
119 tree vtbl_type_node;
120 tree vtbl_ptr_type_node;
122 Namespaces,
124 tree std_node;
125 tree abi_node;
127 A FUNCTION_DECL which can call `abort'. Not necessarily the
128 one that the user will declare, but sufficient to be called
129 by routines that want to abort the program.
131 tree abort_fndecl;
133 Used by RTTI
134 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
135 tree tinfo_var_id; */
139 #define local_names cp_function_chain->x_local_names
141 /* A list of objects which have constructors or destructors
142 which reside in the global scope. The decl is stored in
143 the TREE_VALUE slot and the initializer is stored
144 in the TREE_PURPOSE slot. */
145 tree static_aggregates;
147 /* Like static_aggregates, but for thread_local variables. */
148 tree tls_aggregates;
150 /* -- end of C++ */
152 /* A node for the integer constant 2. */
154 tree integer_two_node;
156 /* vector of static decls. */
159 /* vector of keyed classes. */
162 /* Used only for jumps to as-yet undefined labels, since jumps to
163 defined labels can have their validity checked immediately. */
167 /* The binding level to which this entry is *currently* attached.
168 This is initially the binding level in which the goto appeared,
169 but is modified as scopes are closed. */
171 /* The head of the names list that was current when the goto appeared,
172 or the inner scope popped. These are the decls that will *not* be
173 skipped when jumping to the label. */
174 tree names_in_scope;
175 /* The location of the goto, for error reporting. */
176 location_t o_goto_locus;
177 /* True if an OpenMP structured block scope has been closed since
178 the goto appeared. This means that the branch from the label will
179 illegally exit an OpenMP scope. */
181 };
183 /* A list of all LABEL_DECLs in the function that have names. Here so
184 we can clear out their names' definitions at the end of the
185 function, and so we can check the validity of jumps to these labels. */
195 /* The binding level to which the label is *currently* attached.
196 This is initially set to the binding level in which the label
197 is defined, but is modified as scopes are closed. */
200 /* The head of the names list that was current when the label was
201 defined, or the inner scope popped. These are the decls that will
202 be skipped when jumping to the label. */
203 tree names_in_scope;
205 /* A vector of all decls from all binding levels that would be
206 crossed by a backward branch to the label. */
209 /* A list of uses of the label, before the label is defined. */
212 /* The following bits are set after the label is defined, and are
213 updated as scopes are popped. They indicate that a jump to the
214 label will illegally enter a scope of the given flavor. */
220 };
222 #define named_labels cp_function_chain->x_named_labels
223 \f
224 /* The number of function bodies which we are currently processing.
225 (Zero if we are at namespace scope, one inside the body of a
226 function, two inside the body of a function in a local class, etc.) */
229 /* Whether the exception-specifier is part of a function type (i.e. C++17). */
232 /* States indicating how grokdeclarator() should handle declspecs marked
233 with __attribute__((deprecated)). An object declared as
234 __attribute__((deprecated)) suppresses warnings of uses of other
235 deprecated items. */
238 \f
239 /* A list of VAR_DECLs whose type was incomplete at the time the
240 variable was declared. */
243 tree decl;
244 tree incomplete_type;
245 };
249 \f
250 /* Returns the kind of template specialization we are currently
251 processing, given that it's declaration contained N_CLASS_SCOPES
252 explicit scope qualifications. */
254 tmpl_spec_kind
256 {
262 /* Scan through the template parameter scopes. */
266 {
267 /* If we see a specialization scope inside a parameter scope,
268 then something is wrong. That corresponds to a declaration
269 like:
271 template <class T> template <> ...
273 which is always invalid since [temp.expl.spec] forbids the
274 specialization of a class member template if the enclosing
275 class templates are not explicitly specialized as well. */
277 {
280 else
282 }
287 }
289 /* Handle explicit instantiations. */
291 {
293 /* We've seen a template parameter list during an explicit
294 instantiation. For example:
296 template <class T> template void f(int);
298 This is erroneous. */
300 else
302 }
305 /* We've not seen enough template headers to match all the
306 specialized classes present. For example:
308 template <class T> void R<T>::S<T>::f(int);
310 This is invalid; there needs to be one set of template
311 parameters for each class. */
314 /* We're processing a non-template declaration (even though it may
315 be a member of a template class.) For example:
317 template <class T> void S<T>::f(int);
319 The `class T' matches the `S<T>', leaving no template headers
320 corresponding to the `f'. */
323 /* We've got too many template headers. For example:
325 template <> template <class T> void f (T);
327 There need to be more enclosing classes. */
329 else
330 /* This must be a template. It's of the form:
332 template <class T> template <class U> void S<T>::f(U);
334 This is a specialization if the innermost level was a
335 specialization; otherwise it's just a definition of the
336 template. */
338 }
340 /* Exit the current scope. */
342 void
344 {
346 }
348 /* When a label goes out of scope, check to see if that label was used
349 in a valid manner, and issue any appropriate warnings or errors. */
351 static void
353 {
355 {
357 {
358 location_t location;
362 /* FIXME want (LOCATION_FILE (input_location), (line)0) */
363 /* Avoid crashing later. */
365 }
366 else
368 }
369 }
371 /* Helper function to sort named label entries in a vector by DECL_UID. */
373 static int
375 {
379 /* DECL_UIDs can never be equal. */
381 }
383 /* At the end of a function, all labels declared within the function
384 go out of scope. BLOCK is the top-level block for the
385 function. */
387 static void
389 {
393 /* We need to add the labels to the block chain, so debug
394 information is emitted. But, we want the order to be stable so
395 need to sort them first. Otherwise the debug output could be
396 randomly ordered. I guess it's mostly stable, unless the hash
397 table implementation changes. */
402 {
409 }
414 {
421 }
422 }
424 /* At the end of a block with local labels, restore the outer definition. */
426 static void
428 {
436 else
437 {
440 }
442 }
444 /* The following two routines are used to interface to Objective-C++.
445 The binding level is purposely treated as an opaque type. */
449 {
451 }
453 /* The following routine is used by the NeXT-style SJLJ exceptions;
454 variables get marked 'volatile' so as to not be clobbered by
455 _setjmp()/_longjmp() calls. All variables in the current scope,
456 as well as parent scopes up to (but not including) ENCLOSING_BLK
457 shall be thusly marked. */
459 void
461 {
467 {
468 tree decl;
473 /* Do not climb up past the current function. */
476 }
477 }
479 /* True if B is the level for the condition of a constexpr if. */
481 static bool
483 {
487 }
489 /* Update data for defined and undefined labels when leaving a scope. */
491 int
493 {
498 {
499 tree decl;
501 /* ENT->NAMES_IN_SCOPE may contain a mixture of DECLs and
502 TREE_LISTs representing OVERLOADs, so be careful. */
512 {
531 }
532 }
534 {
539 {
544 }
545 }
548 }
550 /* Saved errorcount to avoid -Wunused-but-set-{parameter,variable} warnings
551 when errors were reported, except for -Werror-unused-but-set-*. */
554 /* Exit a binding level.
555 Pop the level off, and restore the state of the identifier-decl mappings
556 that were in effect when this level was entered.
558 If KEEP == 1, this level had explicit declarations, so
559 and create a "block" (a BLOCK node) for the level
560 to record its declarations and subblocks for symbol table output.
562 If FUNCTIONBODY is nonzero, this level is the body of a function,
563 so create a block as if KEEP were set and also clear out all
564 label names.
566 If REVERSE is nonzero, reverse the order of decls before putting
567 them into the BLOCK. */
569 tree
571 {
572 tree link;
573 /* The chain of decls was accumulated in reverse order.
574 Put it into forward order, just for cleanliness. */
575 tree decls;
576 tree subblocks;
577 tree block;
578 tree decl;
580 scope_kind kind;
584 restart:
597 /* We used to use KEEP == 2 to indicate that the new block should go
598 at the beginning of the list of blocks at this binding level,
599 rather than the end. This hack is no longer used. */
605 /* Any uses of undefined labels, and any defined labels, now operate
606 under constraints of next binding contour. */
611 /* Get the decls in the order they were written.
612 Usually current_binding_level->names is in reverse order.
613 But parameter decls were previously put in forward order. */
617 {
620 }
622 /* If there were any declarations or structure tags in that level,
623 or if this level is a function body,
624 create a BLOCK to record them for the life of this function. */
626 /* Avoid function body block if possible. */
632 {
635 }
637 /* In each subblock, record that this is its superior. */
642 /* We still support the old for-scope rules, whereby the variables
643 in a init statement were in scope after the for-statement ended.
644 We only use the new rules if flag_new_for_scope is nonzero. */
645 leaving_for_scope
648 /* Before we remove the declarations first check for unused variables. */
653 {
654 /* There are cases where D itself is a TREE_LIST. See in
655 push_local_binding where the list of decls returned by
656 getdecls is built. */
663 /* For structured bindings, consider only real variables, not
664 subobjects. */
672 {
674 {
677 OPT_Wunused_variable,
679 else
682 }
684 // For -Wunused-but-set-variable leave references alone.
687 {
692 else
694 OPT_Wunused_but_set_variable,
697 }
698 }
699 }
701 /* Remove declarations for all the DECLs in this level. */
703 {
708 /* It's hard to make this ARM compatibility hack play nicely with
709 lambdas, and it really isn't necessary in C++11 mode. */
712 {
721 /* We have something like:
723 int i;
724 for (int i; ;);
726 and we are leaving the `for' scope. There's no reason to
727 keep the binding of the inner `i' in this case. */
728 ;
731 /* Here, we have something like:
733 typedef int I;
735 void f () {
736 for (int I; ;);
737 }
739 We must pop the for-scope binding so we know what's a
740 type and what isn't. */
741 ;
742 else
743 {
744 /* Mark this VAR_DECL as dead so that we can tell we left it
745 there only for backward compatibility. */
748 /* Keep track of what should have happened when we
749 popped the binding. */
751 {
754 }
756 /* Add it to the list of dead variables in the next
757 outermost binding to that we can remove these when we
758 leave that binding. */
761 link);
763 /* Although we don't pop the cxx_binding, we do clear
764 its SCOPE since the scope is going away now. */
768 /* Don't remove the binding. */
770 }
771 }
772 /* Remove the binding. */
775 else
777 }
779 /* Remove declarations for any `for' variables from inner scopes
780 that we kept around. */
785 /* Restore the IDENTIFIER_TYPE_VALUEs. */
790 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
791 list if a `using' declaration put them there. The debugging
792 back ends won't understand OVERLOAD, so we remove them here.
793 Because the BLOCK_VARS are (temporarily) shared with
794 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
795 popped all the bindings. Also remove undeduced 'auto' decls,
796 which LTO doesn't understand, and can't have been used by anything. */
798 {
802 {
804 || (!processing_template_decl
807 else
809 }
810 }
812 /* If the level being exited is the top level of a function,
813 check over all the labels. */
815 {
817 {
818 /* Since this is the top level block of a function, the vars are
819 the function's parameters. Don't leave them in the BLOCK
820 because they are found in the FUNCTION_DECL instead. */
823 }
824 else
826 }
830 {
831 tree stmt;
833 /* If this is a temporary binding created for a cleanup, then we'll
834 have pushed a statement list level. Pop that, create a new
835 BIND_EXPR for the block, and insert it into the stream. */
839 }
843 {
844 /* The current function is being defined, so its DECL_INITIAL
845 should be error_mark_node. */
849 {
851 {
854 }
855 else
857 }
858 }
860 current_binding_level->blocks
863 /* If we did not make a block for the level just exited,
864 any blocks made for inner levels
865 (since they cannot be recorded as subblocks in that level)
866 must be carried forward so they will later become subblocks
867 of something else. */
869 current_binding_level->blocks
872 /* Each and every BLOCK node created here in `poplevel' is important
873 (e.g. for proper debugging information) so if we created one
874 earlier, mark it as "used". */
878 /* All temporary bindings created for cleanups are popped silently. */
884 }
886 /* Call wrapup_globals_declarations for the globals in NAMESPACE. */
887 /* Diagnose odr-used extern inline variables without definitions
888 in the current TU. */
890 int
892 {
894 {
895 tree decl;
898 {
908 OPT_Wunused_function,
917 }
919 /* Clear out the list, so we don't rescan next time. */
922 /* Write out any globals that need to be output. */
925 }
927 }
928 \f
929 /* In C++, you don't have to write `struct S' to refer to `S'; you
930 can just use `S'. We accomplish this by creating a TYPE_DECL as
931 if the user had written `typedef struct S S'. Create and return
932 the TYPE_DECL for TYPE. */
934 tree
936 {
937 tree decl;
941 /* There are other implicit type declarations, like the one *within*
942 a class that allows you to write `S::S'. We must distinguish
943 amongst these. */
949 }
951 /* Remember a local name for name-mangling purposes. */
953 static void
955 {
965 {
968 {
973 else
979 }
980 }
984 }
985 \f
986 /* Subroutine of duplicate_decls: return truthvalue of whether
987 or not types of these decls match.
989 For C++, we must compare the parameter list so that `int' can match
990 `int&' in a parameter position, but `int&' is not confused with
991 `const int&'. */
993 int
995 {
1002 /* If the two DECLs are not even the same kind of thing, we're not
1003 interested in their types. */
1009 {
1014 tree r2;
1016 /* Specializations of different templates are different functions
1017 even if they have the same type. */
1032 /* A new declaration doesn't match a built-in one unless it
1033 is also extern "C". */
1041 /* A declaration with deduced return type should use its pre-deduction
1042 type for declaration matching. */
1046 {
1049 #ifndef NO_IMPLICIT_EXTERN_C
1052 #endif
1053 ))
1054 {
1058 }
1059 #ifndef NO_IMPLICIT_EXTERN_C
1067 {
1070 }
1071 #endif
1072 else
1073 types_match =
1079 }
1080 else
1083 /* The decls dont match if they correspond to two different versions
1084 of the same function. Disallow extern "C" functions to be
1085 versions for now. */
1089 && record_versions
1094 }
1096 {
1110 else
1111 // We don't need to check equivalently_constrained for variable and
1112 // function templates because we check it on the results.
1114 }
1115 else
1116 {
1117 /* Need to check scope for variable declaration (VAR_DECL).
1118 For typedef (TYPE_DECL), scope is ignored. */
1121 /* [dcl.link]
1122 Two declarations for an object with C language linkage
1123 with the same name (ignoring the namespace that qualify
1124 it) that appear in different namespace scopes refer to
1125 the same object. */
1135 else
1138 COMPARE_REDECLARATION);
1139 }
1141 // Normal functions can be constrained, as can variable partial
1142 // specializations.
1147 }
1149 /* NEWDECL and OLDDECL have identical signatures. If they are
1150 different versions adjust them and return true.
1151 If RECORD is set to true, record function versions. */
1153 bool
1155 {
1160 {
1164 }
1167 {
1171 }
1177 }
1179 /* If NEWDECL is `static' and an `extern' was seen previously,
1180 warn about it. OLDDECL is the previous declaration.
1182 Note that this does not apply to the C++ case of declaring
1183 a variable `extern const' and then later `const'.
1185 Don't complain about built-in functions, since they are beyond
1186 the user's control. */
1188 void
1190 {
1197 /* Don't get confused by static member functions; that's a different
1198 use of `static'. */
1203 /* If the old declaration was `static', or the new one isn't, then
1204 everything is OK. */
1208 /* It's OK to declare a builtin function as `static'. */
1217 }
1219 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1220 function templates. If their exception specifications do not
1221 match, issue a diagnostic. */
1223 static void
1225 tree old_decl)
1226 {
1230 /* Two default specs are equivalent, don't force evaluation. */
1236 {
1239 }
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 /* Merge tree bits that correspond to attributes noreturn, nothrow,
1362 const, malloc, and pure from NEWDECL with those of OLDDECL. */
1364 static void
1366 {
1379 }
1381 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1383 DECL_ATTRIBUTES (fn)))
1385 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1386 If the redeclaration is invalid, a diagnostic is issued, and the
1387 error_mark_node is returned. Otherwise, OLDDECL is returned.
1389 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1390 returned.
1392 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1394 tree
1396 {
1400 tree new_template_info;
1407 /* If either the type of the new decl or the type of the old decl is an
1408 error_mark_node, then that implies that we have already issued an
1409 error (earlier) for some bogus type specification, and in that case,
1410 it is rather pointless to harass the user with yet more error message
1411 about the same declaration, so just pretend the types match here. */
1420 {
1431 }
1433 /* True to merge attributes between the declarations, false to
1434 set OLDDECL's attributes to those of NEWDECL (for template
1435 explicit specializations that specify their own attributes
1436 independent of those specified for the primary template). */
1444 && merge_attr
1446 {
1450 else
1453 }
1455 /* Check for redeclaration and other discrepancies. */
1458 {
1461 {
1462 /* Avoid warnings redeclaring built-ins which have not been
1463 explicitly declared. */
1465 {
1469 OPT_Wbuiltin_declaration_mismatch,
1471 newdecl);
1473 }
1475 /* If you declare a built-in or predefined function name as static,
1476 the old definition is overridden, but optionally warn this was a
1477 bad choice of name. */
1479 {
1484 /* Discard the old built-in function. */
1486 }
1487 /* If the built-in is not ansi, then programs can override
1488 it even globally without an error. */
1493 else
1497 }
1499 {
1506 }
1508 {
1509 /* Avoid warnings redeclaring built-ins which have not been
1510 explicitly declared. */
1512 {
1515 /* A new declaration doesn't match a built-in one unless it
1516 is also extern "C". */
1526 {
1529 /* FILE, tm types are not known at the time
1530 we create the builtins. */
1536 {
1543 {
1551 newdecl_is_friend);
1553 }
1555 }
1559 next_arg:;
1560 }
1563 OPT_Wbuiltin_declaration_mismatch,
1564 "declaration of %q#D conflicts with built-in "
1566 }
1571 {
1572 /* Don't really override olddecl for __* prefixed builtins
1573 except for __[^b]*_chk, the compiler might be using those
1574 explicitly. */
1576 {
1588 {
1590 {
1592 "definition of %q#D ambiguates built-in "
1595 }
1597 "new declaration %q#D ambiguates built-in"
1603 }
1604 }
1606 /* A near match; override the builtin. */
1610 OPT_Wbuiltin_declaration_mismatch,
1611 "new declaration %q#D ambiguates built-in "
1613 else
1618 }
1619 else
1620 /* Discard the old built-in function. */
1623 /* Replace the old RTL to avoid problems with inlining. */
1625 }
1626 /* Even if the types match, prefer the new declarations type for
1627 built-ins which have not been explicitly declared, for
1628 exception lists, etc... */
1630 {
1637 }
1639 /* If a function is explicitly declared "throw ()", propagate that to
1640 the corresponding builtin. */
1645 {
1650 }
1652 /* Whether or not the builtin can throw exceptions has no
1653 bearing on this declarator. */
1657 {
1658 /* If a builtin function is redeclared as `static', merge
1659 the declarations, but make the original one static. */
1663 /* Make the old declaration consistent with the new one so
1664 that all remnants of the builtin-ness of this function
1665 will be banished. */
1668 }
1669 }
1671 {
1672 /* C++ Standard, 3.3, clause 4:
1673 "[Note: a namespace name or a class template name must be unique
1674 in its declarative region (7.3.2, clause 14). ]" */
1681 {
1686 {
1687 /* We do nothing special here, because C++ does such nasty
1688 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1689 get shadowed, and know that if we need to find a TYPE_DECL
1690 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1691 slot of the identifier. */
1693 }
1700 }
1709 }
1711 {
1713 /* These are certainly not duplicate declarations; they're
1714 from different scopes. */
1718 {
1719 /* The name of a class template may not be declared to refer to
1720 any other template, class, function, object, namespace, value,
1721 or type in the same scope. */
1724 {
1729 }
1736 /* Template functions can be disambiguated by
1737 return type. */
1740 // Template functions can also be disambiguated by
1741 // constraints.
1743 {
1747 }
1751 }
1753 {
1755 {
1757 newdecl);
1761 }
1762 /* For function versions, params and types match, but they
1763 are not ambiguous. */
1766 // The functions have the same parameter types.
1769 // And the same constraints.
1771 {
1776 }
1777 else
1779 }
1780 else
1781 {
1786 }
1787 }
1797 /* It's OK to have a template specialization and a non-template
1798 with the same type, or to have specializations of two
1799 different templates with the same type. Note that if one is a
1800 specialization, and the other is an instantiation of the same
1801 template, that we do not exit at this point. That situation
1802 can occur if we instantiate a template class, and then
1803 specialize one of its methods. This situation is valid, but
1804 the declarations must be merged in the usual way. */
1811 /* One of the declarations is a template instantiation, and the
1812 other is not a template at all. That's OK. */
1815 {
1816 /* In [namespace.alias] we have:
1818 In a declarative region, a namespace-alias-definition can be
1819 used to redefine a namespace-alias declared in that declarative
1820 region to refer only to the namespace to which it already
1821 refers.
1823 Therefore, if we encounter a second alias directive for the same
1824 alias, we can just ignore the second directive. */
1830 /* Leave it to update_binding to merge or report error. */
1832 }
1833 else
1834 {
1837 {
1845 }
1850 {
1851 /* Prototype decl follows defn w/o prototype. */
1856 }
1859 {
1860 /* [dcl.link]
1861 If two declarations of the same function or object
1862 specify different linkage-specifications ..., the program
1863 is ill-formed.... Except for functions with C++ linkage,
1864 a function declaration without a linkage specification
1865 shall not precede the first linkage specification for
1866 that function. A function can be declared without a
1867 linkage specification after an explicit linkage
1868 specification has been seen; the linkage explicitly
1869 specified in the earlier declaration is not affected by
1870 such a function declaration.
1872 DR 563 raises the question why the restrictions on
1873 functions should not also apply to objects. Older
1874 versions of G++ silently ignore the linkage-specification
1875 for this example:
1877 namespace N {
1878 extern int i;
1879 extern "C" int i;
1880 }
1882 which is clearly wrong. Therefore, we now treat objects
1883 like functions. */
1885 {
1886 /* There is no explicit linkage-specification, so we use
1887 the linkage from the previous declaration. */
1890 }
1891 else
1892 {
1898 }
1899 }
1902 ;
1904 {
1905 /* Note: free functions, as TEMPLATE_DECLs, are handled below. */
1908 as FUNCTION_DECLs. */
1910 /* C++11 8.3.6/6.
1911 Default arguments for a member function of a class
1912 template shall be specified on the initial declaration
1913 of the member function within the class template. */
1916 else
1917 {
1925 {
1928 {
1930 "default argument given for parameter "
1934 olddecl);
1935 }
1936 else
1937 {
1942 olddecl);
1943 }
1944 }
1945 }
1946 }
1947 }
1949 /* Do not merge an implicit typedef with an explicit one. In:
1951 class A;
1952 ...
1953 typedef class A A __attribute__ ((foo));
1955 the attribute should apply only to the typedef. */
1961 /* If new decl is `static' and an `extern' was seen previously,
1962 warn about it. */
1968 /* We have committed to returning 1 at this point. */
1970 {
1971 /* Now that functions must hold information normally held
1972 by field decls, there is extra work to do so that
1973 declaration information does not get destroyed during
1974 definition. */
1992 /* Optionally warn about more than one declaration for the same
1993 name, but don't warn about a function declaration followed by a
1994 definition. */
1997 /* Don't warn about extern decl followed by definition. */
1999 /* Don't warn about friends, let add_friend take care of it. */
2001 /* Don't warn about declaration followed by specialization. */
2004 {
2006 OPT_Wredundant_decls,
2008 newdecl))
2011 }
2015 {
2017 {
2021 }
2023 }
2024 }
2026 /* Deal with C++: must preserve virtual function table size. */
2028 {
2038 }
2040 /* Copy all the DECL_... slots specified in the new decl except for
2041 any that we copy here from the old type. */
2045 else
2049 {
2055 {
2058 }
2059 }
2062 {
2063 tree old_result;
2064 tree new_result;
2076 {
2077 /* Per C++11 8.3.6/4, default arguments cannot be added in later
2078 declarations of a function template. */
2087 {
2090 else
2102 }
2103 else
2104 {
2112 }
2113 }
2115 /* If the new declaration is a definition, update the file and
2116 line information on the declaration, and also make
2117 the old declaration the same definition. */
2119 {
2125 {
2126 tree parm;
2132 }
2133 }
2136 }
2139 {
2143 /* Automatically handles default parameters. */
2145 tree newtype;
2147 /* For typedefs use the old type, as the new type's DECL_NAME points
2148 at newdecl, which will be ggc_freed. */
2150 {
2151 /* But NEWTYPE might have an attribute, honor that. */
2156 {
2160 }
2162 /* And remove the new type from the variants list. */
2164 {
2169 {
2172 }
2173 }
2174 }
2177 else
2181 {
2183 /* For already initialized vars, TREE_READONLY could have been
2184 cleared in cp_finish_decl, because the var needs runtime
2185 initialization or destruction. Make sure not to set
2186 TREE_READONLY on it again. */
2202 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
2205 {
2206 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
2209 }
2210 }
2212 /* An explicit specialization of a function template or of a member
2213 function of a class template can be declared transaction_safe
2214 independently of whether the corresponding template entity is declared
2215 transaction_safe. */
2228 /* Lay the type out, unless already done. */
2242 /* Merge deprecatedness. */
2246 /* Preserve function specific target and optimization options */
2248 {
2258 }
2259 else
2260 {
2261 /* Merge the const type qualifier. */
2264 /* Merge the volatile type qualifier. */
2267 }
2269 /* Merge the initialization information. */
2272 {
2276 {
2279 }
2280 }
2283 {
2293 else
2294 {
2295 /* Merge the noreturn bit. */
2301 }
2302 /* Keep the old RTL. */
2304 }
2307 {
2308 /* Keep the old RTL. We cannot keep the old RTL if the old
2309 declaration was for an incomplete object and the new
2310 declaration is not since many attributes of the RTL will
2311 change. */
2313 }
2314 }
2315 /* If cannot merge, then use the new type and qualifiers,
2316 and don't preserve the old rtl. */
2317 else
2318 {
2319 /* Clean out any memory we had of the old declaration. */
2329 }
2331 /* Merge the storage class information. */
2344 {
2353 {
2360 }
2363 {
2367 }
2372 /* If the OLDDECL is an instantiation and/or specialization,
2373 then the NEWDECL must be too. But, it may not yet be marked
2374 as such if the caller has created NEWDECL, but has not yet
2375 figured out that it is a redeclaration. */
2379 /* Don't really know how much of the language-specific
2380 values we should copy from old to new. */
2387 {
2391 {
2395 /* Remember the presence of explicit specialization args. */
2398 }
2400 }
2401 /* Only functions have these fields. */
2403 {
2408 /* DECL_THUNKS is only valid for virtual functions,
2409 otherwise it is a DECL_FRIEND_CONTEXT. */
2412 }
2413 /* Only variables have this field. */
2417 }
2420 {
2421 tree parm;
2423 /* Merge parameter attributes. */
2432 }
2436 {
2437 /* If newdecl is not a specialization, then it is not a
2438 template-related function at all. And that means that we
2439 should have exited above, returning 0. */
2443 /* From [temp.expl.spec]:
2445 If a template, a member template or the member of a class
2446 template is explicitly specialized then that
2447 specialization shall be declared before the first use of
2448 that specialization that would cause an implicit
2449 instantiation to take place, in every translation unit in
2450 which such a use occurs. */
2452 olddecl);
2458 /* Don't propagate visibility from the template to the
2459 specialization here. We'll do that in determine_visibility if
2460 appropriate. */
2463 /* [temp.expl.spec/14] We don't inline explicit specialization
2464 just because the primary template says so. */
2474 }
2476 {
2477 /* Never inline re-defined extern inline functions.
2478 FIXME: this could be better handled by keeping both
2479 function as separate declarations. */
2481 }
2482 else
2483 {
2485 {
2489 }
2491 ;
2505 }
2507 /* Preserve abstractness on cloned [cd]tors. */
2510 /* Update newdecl's parms to point at olddecl. */
2516 {
2520 }
2522 {
2523 /* These need to be copied so that the names are available.
2524 Note that if the types do match, we'll preserve inline
2525 info and other bits, but if not, we won't. */
2528 }
2529 /* If redeclaring a builtin function, it stays built in
2530 if newdecl is a gnu_inline definition, or if newdecl is just
2531 a declaration. */
2534 {
2537 /* If we're keeping the built-in definition, keep the rtl,
2538 regardless of declaration matches. */
2541 {
2544 {
2545 /* If a compatible prototype of these builtin functions
2546 is seen, assume the runtime implements it with the
2547 expected semantics. */
2556 }
2557 }
2560 }
2562 /* If defining a function declared with other language
2563 linkage, use the previously declared language linkage. */
2566 {
2568 /* Don't clear out the arguments if we're just redeclaring a
2569 function. */
2572 }
2573 }
2577 /* Now preserve various other info from the definition. */
2583 /* Warn about conflicting visibility specifications. */
2587 {
2589 "%qD: visibility attribute ignored because it "
2593 }
2594 /* Choose the declaration which specified visibility. */
2596 {
2599 }
2600 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2601 so keep this behavior. */
2603 {
2606 }
2607 /* Likewise for DECL_ALIGN, DECL_USER_ALIGN and DECL_PACKED. */
2609 {
2612 }
2621 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2622 with that from NEWDECL below. */
2624 {
2628 }
2630 /* Merge the USED information. */
2636 {
2641 }
2647 /* Merge the DECL_FUNCTION_VERSIONED information. newdecl will be copied
2648 to olddecl and deleted. */
2651 {
2652 /* Set the flag for newdecl so that it gets copied to olddecl. */
2654 /* newdecl will be purged after copying to olddecl and is no longer
2655 a version. */
2657 }
2660 {
2674 /* Preserve symtab node mapping. */
2678 /* If newdecl is a template instantiation, it is possible that
2679 the following sequence of events has occurred:
2681 o A friend function was declared in a class template. The
2682 class template was instantiated.
2684 o The instantiation of the friend declaration was
2685 recorded on the instantiation list, and is newdecl.
2687 o Later, however, instantiate_class_template called pushdecl
2688 on the newdecl to perform name injection. But, pushdecl in
2689 turn called duplicate_decls when it discovered that another
2690 declaration of a global function with the same name already
2691 existed.
2693 o Here, in duplicate_decls, we decided to clobber newdecl.
2695 If we're going to do that, we'd better make sure that
2696 olddecl, and not newdecl, is on the list of
2697 instantiations so that if we try to do the instantiation
2698 again we won't get the clobbered declaration. */
2700 new_template_info,
2701 olddecl);
2702 }
2703 else
2704 {
2711 {
2719 {
2732 }
2740 }
2741 }
2744 {
2748 {
2749 /* Merge the section attribute.
2750 We want to issue an error if the sections conflict but that must be
2751 done later in decl_attributes since we are called before attributes
2752 are assigned. */
2757 {
2761 else
2765 }
2766 }
2770 {
2774 }
2775 }
2781 {
2784 }
2786 /* NEWDECL contains the merged attribute lists.
2787 Update OLDDECL to be the same. */
2790 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2791 so that encode_section_info has a chance to look at the new decl
2792 flags and attributes. */
2799 /* The NEWDECL will no longer be needed. Because every out-of-class
2800 declaration of a member results in a call to duplicate_decls,
2801 freeing these nodes represents in a significant savings.
2803 Before releasing the node, be sore to remove function from symbol
2804 table that might have been inserted there to record comdat group.
2805 Be sure to however do not free DECL_STRUCT_FUNCTION because this
2806 structure is shared in between newdecl and oldecl. */
2810 {
2814 }
2816 /* Remove the associated constraints for newdecl, if any, before
2817 reclaiming memory. */
2824 }
2825 \f
2826 /* Return zero if the declaration NEWDECL is valid
2827 when the declaration OLDDECL (assumed to be for the same name)
2828 has already been seen.
2829 Otherwise return an error message format string with a %s
2830 where the identifier should go. */
2834 {
2836 {
2837 /* Because C++ can put things into name space for free,
2838 constructs like "typedef struct foo { ... } foo"
2839 would look like an erroneous redeclaration. */
2842 else
2844 }
2846 {
2847 /* If this is a pure function, its olddecl will actually be
2848 the original initialization to `0' (which we force to call
2849 abort()). Don't complain about redefinition in this case. */
2854 /* If both functions come from different namespaces, this is not
2855 a redeclaration - this is a conflict with a used function. */
2861 /* We'll complain about linkage mismatches in
2862 warn_extern_redeclared_static. */
2864 /* Defining the same name twice is no good. */
2867 {
2873 }
2876 {
2881 {
2885 else
2888 }
2889 }
2891 check_abi_tag_redeclaration
2896 }
2898 {
2902 {
2907 }
2925 {
2930 {
2934 else
2937 }
2938 }
2940 /* Core issue #226 (C++0x):
2942 If a friend function template declaration specifies a
2943 default template-argument, that declaration shall be a
2944 definition and shall be the only declaration of the
2945 function template in the translation unit. */
2956 }
2962 {
2963 /* Only variables can be thread-local, and all declarations must
2964 agree on this property. */
2968 else
2971 }
2973 {
2974 /* The objects have been declared at namespace scope. If either
2975 is a member of an anonymous union, then this is an invalid
2976 redeclaration. For example:
2978 int i;
2979 union { int i; };
2981 is invalid. */
2985 /* If at least one declaration is a reference, there is no
2986 conflict. For example:
2988 int i = 3;
2989 extern int i;
2991 is valid. */
2995 /* Static data member declared outside a class definition
2996 if the variable is defined within the class with constexpr
2997 specifier is declaration rather than definition (and
2998 deprecated). */
3004 {
3006 /* For now, only warn with explicit -Wdeprecated. */
3009 "redundant redeclaration of %<constexpr%> static "
3014 }
3016 /* Reject two definitions. */
3018 }
3019 else
3020 {
3021 /* Objects declared with block scope: */
3022 /* Reject two definitions, and reject a definition
3023 together with an external reference. */
3027 }
3028 }
3029 \f
3031 /* Hash and equality functions for the named_label table. */
3033 hashval_t
3035 {
3037 }
3039 bool
3041 {
3043 }
3045 /* Look for a label named ID in the current function. If one cannot
3046 be found, create one. Return the named_label_entry, or NULL on
3047 failure. */
3051 {
3052 /* You can't use labels at global scope. */
3054 {
3057 }
3063 named_label_entry **slot
3068 {
3073 {
3077 }
3078 }
3080 /* We are making a new decl, create or reuse the named_label_entry */
3084 else
3085 {
3090 }
3092 /* Now create the LABEL_DECL. */
3098 {
3102 }
3107 }
3109 /* Wrapper for lookup_label_1. */
3111 tree
3113 {
3118 }
3120 tree
3122 {
3127 }
3129 /* Returns nonzero if it is ill-formed to jump past the declaration of
3130 DECL. Returns 2 if it's also a real problem. */
3132 static int
3134 {
3135 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
3136 with automatic storage duration is not in scope to a point where it is
3137 in scope is ill-formed unless the variable has scalar type, class type
3138 with a trivial default constructor and a trivial destructor, a
3139 cv-qualified version of one of these types, or an array of one of the
3140 preceding types and is declared without an initializer (8.5). */
3155 }
3157 /* A subroutine of check_previous_goto_1 and check_goto to identify a branch
3158 to the user. */
3160 static bool
3162 diagnostic_t diag_kind)
3163 {
3164 bool complained
3171 }
3173 /* Check that a single previously seen jump to a newly defined label
3174 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
3175 the jump context; NAMES are the names in scope in LEVEL at the jump
3176 context; LOCUS is the source position of the jump or 0. Returns
3177 true if all is well. */
3179 static bool
3182 {
3189 {
3195 }
3198 {
3204 {
3210 {
3212 DK_PERMERROR);
3214 }
3216 {
3220 else
3222 " enters scope of %q#D, which has "
3224 }
3225 }
3233 {
3260 {
3264 }
3269 }
3272 {
3278 }
3279 }
3282 }
3284 static void
3286 {
3290 }
3292 static bool
3294 {
3296 }
3298 /* Check that a new jump to a label DECL is OK. Called by
3299 finish_goto_stmt. */
3301 void
3303 {
3304 /* We can't know where a computed goto is jumping.
3305 So we assume that it's OK. */
3309 /* We didn't record any information about this label when we created it,
3310 and there's not much point since it's trivial to analyze as a return. */
3315 named_label_entry **slot
3319 /* If the label hasn't been defined yet, defer checking. */
3321 {
3322 /* Don't bother creating another use if the last goto had the
3323 same data, and will therefore create the same set of errors. */
3328 named_label_use_entry *new_use
3338 }
3342 tree bad;
3348 {
3356 }
3359 {
3363 {
3364 /* Can't skip init of __exception_info. */
3366 {
3370 }
3374 }
3376 {
3380 else
3382 " enters scope of %q#D which has "
3384 }
3385 }
3388 {
3397 }
3400 {
3403 }
3406 {
3410 {
3412 {
3417 }
3421 }
3422 }
3423 }
3425 /* Check that a return is ok wrt OpenMP structured blocks.
3426 Called by finish_return_stmt. Returns true if all is well. */
3428 bool
3430 {
3433 {
3436 }
3440 }
3442 /* Define a label, specifying the location in the source file.
3443 Return the LABEL_DECL node for the label. */
3445 static tree
3447 {
3448 /* After labels, make any new cleanups in the function go into their
3449 own new (temporary) binding contour. */
3459 {
3462 }
3463 else
3464 {
3465 /* Mark label as having been defined. */
3467 /* Say where in the source. */
3476 }
3479 }
3481 /* Wrapper for define_label_1. */
3483 tree
3485 {
3490 }
3493 struct cp_switch
3494 {
3497 /* The SWITCH_STMT being built. */
3498 tree switch_stmt;
3499 /* A splay-tree mapping the low element of a case range to the high
3500 element, or NULL_TREE if there is no high element. Used to
3501 determine whether or not a new case label duplicates an old case
3502 label. We need a tree, rather than simply a hash table, because
3503 of the GNU case range extension. */
3504 splay_tree cases;
3505 /* Remember whether there was a case value that is outside the
3506 range of the original type of the controlling expression. */
3508 /* Remember whether a default: case label has been seen. */
3510 /* Remember whether a BREAK_STMT has been seen in this SWITCH_STMT. */
3512 /* Set if inside of {FOR,DO,WHILE}_BODY nested inside of a switch,
3513 where BREAK_STMT doesn't belong to the SWITCH_STMT. */
3515 };
3517 /* A stack of the currently active switch statements. The innermost
3518 switch statement is on the top of the stack. There is no need to
3519 mark the stack for garbage collection because it is only active
3520 during the processing of the body of a function, and we never
3521 collect at that point. */
3525 /* Called right after a switch-statement condition is parsed.
3526 SWITCH_STMT is the switch statement being parsed. */
3528 void
3530 {
3541 }
3543 void
3545 {
3547 location_t switch_location;
3549 /* Emit warnings as needed. */
3551 const bool bool_cond_p
3560 /* For the benefit of block_may_fallthru remember if the switch body
3561 case labels cover all possible values and if there are break; stmts. */
3563 || (!processing_template_decl
3573 }
3575 /* Note that a BREAK_STMT is about to be added. If it is inside of
3576 a SWITCH_STMT and not inside of a loop body inside of it, note
3577 in switch_stack we've seen a BREAK_STMT. */
3579 void
3581 {
3584 }
3586 /* Note the start of processing of an iteration statement's body.
3587 The note_break_stmt function will do nothing while processing it.
3588 Return a flag that should be passed to note_iteration_stmt_body_end. */
3590 bool
3592 {
3598 }
3600 /* Note the end of processing of an iteration statement's body. */
3602 void
3604 {
3607 }
3609 /* Convert a case constant VALUE in a switch to the type TYPE of the switch
3610 condition. Note that if TYPE and VALUE are already integral we don't
3611 really do the conversion because the language-independent
3612 warning/optimization code will work better that way. */
3614 static tree
3616 {
3625 {
3628 value = (perform_implicit_conversion_flags
3631 }
3633 }
3635 /* Note that we've seen a definition of a case label, and complain if this
3636 is a bad place for one. */
3638 tree
3640 {
3643 tree type;
3649 {
3650 tree label;
3652 /* For templates, just add the case label; we'll do semantic
3653 analysis at instantiation-time. */
3656 }
3658 /* Find the condition on which this switch statement depends. */
3675 /* After labels, make any new cleanups in the function go into their
3676 own new (temporary) binding contour. */
3683 }
3684 \f
3686 tree scope;
3687 tree name;
3688 tree template_id;
3691 };
3694 {
3697 /* Hash a TYPENAME_TYPE. */
3699 static hashval_t
3701 {
3702 hashval_t hash;
3708 }
3710 /* Compare two TYPENAME_TYPEs. */
3712 static bool
3714 {
3720 }
3721 };
3723 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3724 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3726 Returns the new TYPENAME_TYPE. */
3730 tree
3733 {
3734 tree t;
3735 tree d;
3736 typename_info ti;
3738 hashval_t hash;
3753 /* See if we already have this type. */
3757 else
3758 {
3759 /* Build the TYPENAME_TYPE. */
3766 /* Build the corresponding TYPE_DECL. */
3773 /* Store it in the hash table. */
3776 /* TYPENAME_TYPEs must always be compared structurally, because
3777 they may or may not resolve down to another type depending on
3778 the currently open classes. */
3780 }
3783 }
3785 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3786 provided to name the type. Returns an appropriate type, unless an
3787 error occurs, in which case error_mark_node is returned. If we
3788 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3789 return that, rather than the _TYPE it corresponds to, in other
3790 cases we look through the type decl. If TF_ERROR is set, complain
3791 about errors, otherwise be quiet. */
3793 tree
3795 tsubst_flags_t complain)
3796 {
3797 tree fullname;
3798 tree t;
3807 {
3812 else
3813 /* Create a TEMPLATE_ID_EXPR for the type. */
3817 }
3824 {
3829 {
3833 }
3834 }
3836 {
3840 }
3845 {
3849 }
3851 /* When the CONTEXT is a dependent type, NAME could refer to a
3852 dependent base class of CONTEXT. But look inside it anyway
3853 if CONTEXT is a currently open scope, in case it refers to a
3854 member of the current instantiation or a non-dependent base;
3855 lookup will stop when we hit a dependent base. */
3857 /* We should only set WANT_TYPE when we're a nested typename type.
3858 Then we can give better diagnostics if we find a non-type. */
3860 else
3869 {
3871 {
3874 else
3877 }
3879 }
3881 /* Pull out the template from an injected-class-name (or multiple). */
3886 {
3888 {
3891 }
3893 }
3896 {
3901 }
3903 {
3908 }
3913 /* If we are currently parsing a template and if T is a typedef accessed
3914 through CONTEXT then we need to remember and check access of T at
3915 template instantiation time. */
3930 }
3932 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3933 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3934 in which case error_mark_node is returned.
3936 If PARM_LIST is non-NULL, also make sure that the template parameter
3937 list of TEMPLATE_DECL matches.
3939 If COMPLAIN zero, don't complain about any errors that occur. */
3941 tree
3943 tsubst_flags_t complain)
3944 {
3945 tree t;
3946 tree d;
3956 {
3966 {
3970 }
3974 {
3976 {
3980 }
3982 }
3985 complain))
3989 }
3991 /* Build the UNBOUND_CLASS_TEMPLATE. */
3997 /* Build the corresponding TEMPLATE_DECL. */
4006 }
4008 \f
4010 /* Push the declarations of builtin types into the global namespace.
4011 RID_INDEX is the index of the builtin type in the array
4012 RID_POINTERS. NAME is the name used when looking up the builtin
4013 type. TYPE is the _TYPE node for the builtin type.
4015 The calls to set_global_binding below should be
4016 eliminated. Built-in types should not be looked up name; their
4017 names are keywords that the parser can recognize. However, there
4018 is code in c-common.c that uses identifier_global_value to look up
4019 built-in types by name. */
4021 void
4024 tree type)
4025 {
4029 {
4035 }
4040 {
4046 }
4049 {
4053 }
4054 }
4056 /* Push a type into the namespace so that the back ends ignore it. */
4058 static void
4060 {
4063 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
4070 }
4072 /* Create all the predefined identifiers. */
4074 static void
4076 {
4077 struct predefined_identifier
4078 {
4082 };
4084 /* A table of identifiers to create at startup. */
4088 /* Some of these names have a trailing space so that it is
4089 impossible for them to conflict with names written by users. */
4106 /* The demangler expects anonymous namespaces to be called
4107 something starting with '_GLOBAL__N_'. It no longer needs
4108 to be unique to the TU. */
4114 };
4118 {
4120 /* Some of these identifiers already have a special kind. */
4123 }
4124 }
4126 /* Create the predefined scalar types of C,
4127 and some nodes representing standard constants (0, 1, (void *)0).
4128 Initialize the global binding level.
4129 Make definitions for built-in primitive functions. */
4131 void
4133 {
4134 tree void_ftype;
4135 tree void_ftype_ptr;
4137 /* Create all the identifiers we need. */
4140 /* Create the global variables. */
4145 /* Enter the global namespace. */
4148 void_type_node);
4152 /* Remember whether we want the empty class passing ABI change warning
4153 in this TU. */
4156 debug_hooks->register_main_translation_unit
4164 /* Initially, C. */
4167 /* Create the `std' namespace. */
4173 /* There's no fixed location for <command-line>, the current
4174 location is <builtins>, which is somewhat confusing. */
4183 /* Guess at the initial static decls size. */
4186 /* ... and keyed classes. */
4198 NULL_TREE);
4200 #if 0
4202 #endif
4211 void_ftype_ptr
4214 /* Create the conversion operator marker. This operator's DECL_NAME
4215 is in the identifier table, so we can use identifier equality to
4216 find it. */
4218 void_ftype);
4220 /* C++ extensions */
4225 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
4228 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
4229 result. */
4236 {
4237 /* Make sure we get a unique function type, so we can give
4238 its pointer type a name. (This wins for gdb.) */
4245 }
4248 vtbl_type_node
4267 /* Now, C++. */
4272 {
4275 }
4281 {
4284 tree ptr_ftype_sizetype;
4285 tree new_eh_spec;
4287 ptr_ftype_sizetype
4290 {
4291 tree bad_alloc_id;
4292 tree bad_alloc_type_node;
4293 tree bad_alloc_decl;
4299 bad_alloc_decl
4304 new_eh_spec
4306 }
4307 else
4310 /* Ensure attribs.c is initialized. */
4313 /* Ensure constraint.cc is initialized. */
4317 NULL_TREE);
4320 extvisattr);
4334 {
4335 /* Also push the sized deallocation variants:
4336 void operator delete(void*, std::size_t) throw();
4337 void operator delete[](void*, std::size_t) throw(); */
4338 tree void_ftype_ptr_size
4342 extvisattr);
4346 }
4349 {
4356 /* operator new (size_t, align_val_t); */
4368 /* operator delete (void *, align_val_t); */
4377 {
4378 /* operator delete (void *, size_t, align_val_t); */
4381 NULL_TREE);
4386 }
4387 }
4399 }
4401 abort_fndecl
4405 /* Perform other language dependent initializations. */
4419 /* Show we use EH for cleanups. */
4422 }
4424 /* Generate an initializer for a function naming variable from
4425 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
4426 filled in with the type of the init. */
4428 tree
4430 {
4432 tree type;
4437 {
4441 }
4450 else
4454 }
4456 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
4457 the decl, LOC is the location to give the decl, NAME is the
4458 initialization string and TYPE_DEP indicates whether NAME depended
4459 on the type of the function. We make use of that to detect
4460 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
4461 at the point of first use, so we mustn't push the decl now. */
4463 static tree
4465 {
4468 tree type;
4482 {
4486 LOOKUP_ONLYCONVERTING);
4487 }
4488 else
4489 {
4492 }
4495 }
4497 static tree
4499 {
4507 /* Runtime library routines are, by definition, available in an
4508 external shared object. */
4514 /* A function in the user's namespace should have an explicit
4515 declaration before it is used. Mark the built-in function as
4516 anticipated but not actually declared. */
4520 {
4523 /* Treat __*_chk fortification functions as anticipated as well,
4524 unless they are __builtin_*. */
4529 }
4533 else
4537 }
4539 tree
4541 {
4544 /* All builtins that don't begin with an '_' should additionally
4545 go in the 'std' namespace. */
4547 {
4552 }
4555 }
4557 /* Like cxx_builtin_function, but guarantee the function is added to the global
4558 scope. This is to allow function specific options to add new machine
4559 dependent builtins when the target ISA changes via attribute((target(...)))
4560 which saves space on program startup if the program does not use non-generic
4561 ISAs. */
4563 tree
4565 {
4569 /* All builtins that don't begin with an '_' should additionally
4570 go in the 'std' namespace. */
4572 {
4577 }
4580 }
4582 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
4583 function. Not called directly. */
4585 static tree
4588 {
4596 /* Runtime library routines are, by definition, available in an
4597 external shared object. */
4602 }
4604 /* Returns the _DECL for a library function with C++ linkage. */
4606 static tree
4609 {
4614 }
4616 /* Like build_library_fn, but takes a C string instead of an
4617 IDENTIFIER_NODE. */
4619 tree
4621 {
4623 }
4625 /* Like build_cp_library_fn, but takes a C string instead of an
4626 IDENTIFIER_NODE. */
4628 tree
4630 {
4632 ecf_flags);
4633 }
4635 /* Like build_library_fn, but also pushes the function so that we will
4636 be able to find it via get_global_binding. Also, the function
4637 may throw exceptions listed in RAISES. */
4639 tree
4641 {
4642 tree fn;
4650 }
4652 /* Like build_cp_library_fn, but also pushes the function so that it
4653 will be found by normal lookup. */
4655 static tree
4658 {
4665 }
4667 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
4668 a FUNCTION_TYPE. */
4670 tree
4672 {
4675 }
4677 /* Like push_library_fn, but also note that this function throws
4678 and does not return. Used for __throw_foo and the like. */
4680 tree
4682 {
4685 }
4686 \f
4687 /* When we call finish_struct for an anonymous union, we create
4688 default copy constructors and such. But, an anonymous union
4689 shouldn't have such things; this function undoes the damage to the
4690 anonymous union type T.
4692 (The reason that we create the synthesized methods is that we don't
4693 distinguish `union { int i; }' from `typedef union { int i; } U'.
4694 The first is an anonymous union; the second is just an ordinary
4695 union type.) */
4697 void
4699 {
4700 /* Wipe out memory of synthesized methods. */
4708 /* Splice the implicitly generated functions out of TYPE_FIELDS. */
4712 else
4715 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4716 assignment operators (because they cannot have these methods themselves).
4717 For anonymous unions this is already checked because they are not allowed
4718 in any union, otherwise we have to check it. */
4720 {
4725 {
4728 {
4738 }
4739 }
4740 }
4741 }
4743 /* Warn for an attribute located at LOCATION that appertains to the
4744 class type CLASS_TYPE that has not been properly placed after its
4745 class-key, in it class-specifier. */
4747 void
4749 tree class_type)
4750 {
4754 "attribute ignored in declaration "
4759 }
4761 /* Make sure that a declaration with no declarator is well-formed, i.e.
4762 just declares a tagged type or anonymous union.
4764 Returns the type declared; or NULL_TREE if none. */
4766 tree
4769 {
4772 /* If a class, struct, or enum type is declared by the DECLSPECS
4773 (i.e, if a class-specifier, enum-specifier, or non-typename
4774 elaborated-type-specifier appears in the DECLSPECS),
4775 DECLARED_TYPE is set to the corresponding type. */
4782 {
4788 }
4801 {
4803 "%<auto%> can only be specified for variables "
4806 }
4807 /* Check for an anonymous union. */
4810 {
4811 /* 7/3 In a simple-declaration, the optional init-declarator-list
4812 can be omitted only when declaring a class (clause 9) or
4813 enumeration (7.2), that is, when the decl-specifier-seq contains
4814 either a class-specifier, an elaborated-type-specifier with
4815 a class-key (9.1), or an enum-specifier. In these cases and
4816 whenever a class-specifier or enum-specifier is present in the
4817 decl-specifier-seq, the identifiers in these specifiers are among
4818 the names being declared by the declaration (as class-name,
4819 enum-names, or enumerators, depending on the syntax). In such
4820 cases, and except for the declaration of an unnamed bit-field (9.6),
4821 the decl-specifier-seq shall introduce one or more names into the
4822 program, or shall redeclare a name introduced by a previous
4823 declaration. [Example:
4824 enum { }; // ill-formed
4825 typedef class { }; // ill-formed
4826 --end example] */
4828 {
4831 }
4838 }
4840 else
4841 {
4849 && (!current_class_type
4858 "a storage class can only be specified for objects "
4862 "%<const%> can only be specified for objects and "
4866 "%<volatile%> can only be specified for objects and "
4870 "%<__restrict%> can only be specified for objects and "
4874 "%<__thread%> can only be specified for objects "
4882 }
4885 {
4886 location_t loc;
4889 /* For a non-template class, use the name location. */
4891 else
4892 /* For a template class (an explicit instantiation), use the
4893 current location. */
4897 /* [dcl.attr.grammar]/4:
4899 No attribute-specifier-seq shall appertain to an explicit
4900 instantiation. */
4901 {
4904 declared_type))
4906 "no attribute can be applied to "
4908 }
4909 else
4911 }
4914 }
4916 /* Called when a declaration is seen that contains no names to declare.
4917 If its type is a reference to a structure, union or enum inherited
4918 from a containing scope, shadow that tag name for the current scope
4919 with a forward reference.
4920 If its type defines a new named structure or union
4921 or defines an enum, it is valid but we need not do anything here.
4922 Otherwise, it is an error.
4924 C++: may have to grok the declspecs to learn about static,
4925 complain for anonymous unions.
4927 Returns the TYPE declared -- or NULL_TREE if none. */
4929 tree
4931 {
4941 /* This is where the variables in an anonymous union are
4942 declared. An anonymous union declaration looks like:
4943 union { ... } ;
4944 because there is no declarator after the union, the parser
4945 sends that declaration here. */
4947 {
4951 {
4955 }
4956 }
4959 }
4960 \f
4961 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4963 tree
4967 {
4968 tree attrs;
4969 tree type;
4970 enum decl_context context
4976 {
4981 /* A template type parameter or other dependent type. */
4984 else
4986 }
4988 }
4990 /* Process a DECLARATOR for a function-scope variable declaration,
4991 namespace-scope variable declaration, or function declaration.
4992 (Function definitions go through start_function; class member
4993 declarations appearing in the body of the class go through
4994 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4995 If an error occurs, the error_mark_node is returned instead.
4997 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4998 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4999 for an explicitly defaulted function, or SD_DELETED for an explicitly
5000 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
5001 implicitly initialized via a default constructor. ATTRIBUTES and
5002 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
5004 The scope represented by the context of the returned DECL is pushed
5005 (if it is not the global namespace) and is assigned to
5006 *PUSHED_SCOPE_P. The caller is then responsible for calling
5007 pop_scope on *PUSHED_SCOPE_P if it is set. */
5009 tree
5013 tree attributes,
5014 tree prefix_attributes,
5016 {
5017 tree decl;
5018 tree context;
5025 /* An object declared as __attribute__((deprecated)) suppresses
5026 warnings of uses of other deprecated items. */
5045 /* Is it valid for this decl to have an initializer at all?
5046 If not, set INITIALIZED to zero, which will indirectly
5047 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
5050 {
5053 }
5056 {
5060 decl);
5064 }
5070 /* If this is a typedef that names the class for linkage purposes
5071 (7.1.3p8), apply any attributes directly to the type. */
5076 else
5079 /* Set attributes here so if duplicate decl, will have proper attributes. */
5082 /* Dllimported symbols cannot be defined. Static data members (which
5083 can be initialized in-class and dllimported) go through grokfield,
5084 not here, so we don't need to exclude those decls when checking for
5085 a definition. */
5087 {
5090 }
5092 /* If #pragma weak was used, mark the decl weak now. */
5104 {
5108 {
5118 {
5124 }
5125 else
5126 {
5131 {
5138 }
5139 /* Static data member are tricky; an in-class initialization
5140 still doesn't provide a definition, so the in-class
5141 declaration will have DECL_EXTERNAL set, but will have an
5142 initialization. Thus, duplicate_decls won't warn
5143 about this situation, and so we check here. */
5152 }
5153 }
5154 else
5155 {
5157 this_tmpl
5158 ? current_template_parms
5164 }
5166 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
5168 /* Do not mark DECL as an explicit specialization if it was not
5169 already marked as an instantiation; a declaration should
5170 never be marked as a specialization unless we know what
5171 template is being specialized. */
5173 {
5178 else
5181 /* [temp.expl.spec] An explicit specialization of a static data
5182 member of a template is a definition if the declaration
5183 includes an initializer; otherwise, it is a declaration.
5185 We check for processing_specialization so this only applies
5186 to the new specialization syntax. */
5189 }
5192 /* Aliases are definitions. */
5195 decl);
5196 }
5200 /* Enter this declaration into the symbol table. Don't push the plain
5201 VAR_DECL for a variable template. */
5214 {
5215 /* This is a const variable with implicit 'static'. Set
5216 DECL_THIS_STATIC so we can tell it from variables that are
5217 !TREE_PUBLIC because of the anonymous namespace. */
5220 }
5224 {
5228 decl);
5231 else
5235 }
5241 }
5243 /* Process the declaration of a variable DECL. INITIALIZED is true
5244 iff DECL is explicitly initialized. (INITIALIZED is false if the
5245 variable is initialized via an implicitly-called constructor.)
5246 This function must be called for ordinary variables (including, for
5247 example, implicit instantiations of templates), but must not be
5248 called for template declarations. */
5250 void
5252 {
5253 tree type;
5268 /* If an explicit initializer is present, or if this is a definition
5269 of an aggregate, then we need a complete type at this point.
5270 (Scalars are always complete types, so there is nothing to
5271 check.) This code just sets COMPLETE_P; errors (if necessary)
5272 are issued below. */
5274 && !complete_p
5276 {
5278 /* We will not yet have set TREE_READONLY on DECL if the type
5279 was "const", but incomplete, before this point. But, now, we
5280 have a complete type, so we can try again. */
5282 }
5285 /* Is it valid for this decl to have an initializer at all? */
5286 {
5287 /* Don't allow initializations for incomplete types except for
5288 arrays which might be completed by the initialization. */
5294 {
5297 }
5299 {
5302 /* else we already gave an error in start_decl. */
5303 }
5304 }
5306 {
5309 else
5310 {
5312 decl);
5313 /* Change the type so that assemble_variable will give
5314 DECL an rtl we can live with: (mem (const_int 0)). */
5316 }
5317 }
5319 /* Create a new scope to hold this declaration if necessary.
5320 Whether or not a new scope is necessary cannot be determined
5321 until after the type has been completed; if the type is a
5322 specialization of a class template it is not until after
5323 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
5324 will be set correctly. */
5326 }
5328 /* Handle initialization of references. DECL, TYPE, and INIT have the
5329 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
5330 but will be set to a new CLEANUP_STMT if a temporary is created
5331 that must be destroyed subsequently.
5333 Returns an initializer expression to use to initialize DECL, or
5334 NULL if the initialization can be performed statically.
5336 Quotes on semantics can be found in ARM 8.4.3. */
5338 static tree
5340 {
5342 {
5348 }
5352 tf_warning_or_error);
5357 /* Note: default conversion is only called in very special cases. */
5360 /* check_initializer handles this for non-reference variables, but for
5361 references we need to do it here or the initializer will get the
5362 incomplete array type and confuse later calls to
5363 cp_complete_array_type. */
5368 {
5372 }
5374 /* Convert INIT to the reference type TYPE. This may involve the
5375 creation of a temporary, whose lifetime must be the same as that
5376 of the reference. If so, a DECL_EXPR for the temporary will be
5377 added just after the DECL_EXPR for DECL. That's why we don't set
5378 DECL_INITIAL for local references (instead assigning to them
5379 explicitly); we need to allow the temporary to be initialized
5380 first. */
5382 tf_warning_or_error);
5383 }
5385 /* Designated initializers in arrays are not supported in GNU C++.
5386 The parser cannot detect this error since it does not know whether
5387 a given brace-enclosed initializer is for a class type or for an
5388 array. This function checks that CE does not use a designated
5389 initializer. If it does, an error is issued. Returns true if CE
5390 is valid, i.e., does not have a designated initializer. */
5392 bool
5395 {
5396 /* Designated initializers for array elements are not supported. */
5398 {
5399 /* The parser only allows identifiers as designated
5400 initializers. */
5402 {
5406 }
5408 {
5412 }
5420 {
5421 /* A C99 designator is OK if it matches the current index. */
5423 {
5426 }
5427 else
5429 }
5430 else
5435 }
5438 }
5440 /* When parsing `int a[] = {1, 2};' we don't know the size of the
5441 array until we finish parsing the initializer. If that's the
5442 situation we're in, update DECL accordingly. */
5444 static void
5446 {
5452 {
5453 /* do_default is really a C-ism to deal with tentative definitions.
5454 But let's leave it here to ease the eventual merge. */
5459 /* Check that there are no designated initializers in INIT, as
5460 those are not supported in GNU C++, and as the middle-end
5461 will crash if presented with a non-numeric designated
5462 initializer. */
5464 {
5467 HOST_WIDE_INT i;
5469 {
5474 }
5475 }
5479 else
5480 {
5482 do_default);
5484 {
5488 }
5490 {
5492 {
5495 }
5496 /* If a `static' var's size isn't known, make it extern as
5497 well as static, so it does not get allocated. If it's not
5498 `static', then don't mark it extern; finish_incomplete_decl
5499 will give it a default size and it will get allocated. */
5502 }
5504 {
5507 }
5508 }
5513 }
5514 }
5516 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
5517 any appropriate error messages regarding the layout. */
5519 static void
5521 {
5522 tree type;
5528 /* If we haven't already laid out this declaration, do so now.
5529 Note that we must not call complete type for an external object
5530 because it's type might involve templates that we are not
5531 supposed to instantiate yet. (And it's perfectly valid to say
5532 `extern X x' for some incomplete type `X'.) */
5541 {
5542 /* An automatic variable with an incomplete type: that is an error.
5543 Don't talk about array types here, since we took care of that
5544 message in grokdeclarator. */
5548 }
5549 #if 0
5550 /* Keep this code around in case we later want to control debug info
5551 based on whether a type is "used". (jason 1999-11-11) */
5554 /* Let debugger know it should output info for this type. */
5559 #endif
5564 {
5567 else
5568 {
5572 }
5573 }
5574 }
5576 /* If a local static variable is declared in an inline function, or if
5577 we have a weak definition, we must endeavor to create only one
5578 instance of the variable at link-time. */
5580 void
5582 {
5583 /* Static data in a function with comdat linkage also has comdat
5584 linkage. */
5586 /* Don't mess with __FUNCTION__. */
5591 {
5593 {
5594 /* With weak symbols, we simply make the variable COMDAT;
5595 that will cause copies in multiple translations units to
5596 be merged. */
5598 }
5599 else
5600 {
5603 {
5604 /* Without weak symbols, we can use COMMON to merge
5605 uninitialized variables. */
5608 }
5609 else
5610 {
5611 /* While for initialized variables, we must use internal
5612 linkage -- which means that multiple copies will not
5613 be merged. */
5619 "%q#D are wrong (you%'ll wind up with "
5621 else
5623 "static data %q#D are wrong (you%'ll wind "
5629 }
5630 }
5631 }
5632 }
5634 /* Issue an error message if DECL is an uninitialized const variable.
5635 CONSTEXPR_CONTEXT_P is true when the function is called in a constexpr
5636 context from potential_constant_expression. Returns true if all is well,
5637 false otherwise. */
5639 bool
5641 tsubst_flags_t complain)
5642 {
5645 /* ``Unless explicitly declared extern, a const object does not have
5646 external linkage and must be initialized. ($8.4; $12.1)'' ARM
5647 7.1.6 */
5650 && (constexpr_context_p
5653 {
5659 {
5661 {
5665 }
5666 else
5667 {
5671 "uninitialized variable %qD in %<constexpr%> "
5674 }
5675 }
5679 decl);
5682 {
5683 tree defaulted_ctor;
5690 "constructor is not user-provided because it is "
5693 "and the implicitly-defined constructor does not "
5695 }
5698 }
5701 }
5702 \f
5703 /* Structure holding the current initializer being processed by reshape_init.
5704 CUR is a pointer to the current element being processed, END is a pointer
5705 after the last element present in the initializer. */
5706 struct reshape_iter
5707 {
5710 };
5714 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
5715 returned is the next FIELD_DECL (possibly FIELD itself) that can be
5716 initialized. If there are no more such fields, the return value
5717 will be NULL. */
5719 tree
5721 {
5730 }
5732 /* Return true for [dcl.init.list] direct-list-initialization from
5733 single element of enumeration with a fixed underlying type. */
5735 bool
5737 {
5746 }
5748 /* Subroutine of reshape_init_array and reshape_init_vector, which does
5749 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
5750 INTEGER_CST representing the size of the array minus one (the maximum index),
5751 or NULL_TREE if the array was declared without specifying the size. D is
5752 the iterator within the constructor. */
5754 static tree
5756 tsubst_flags_t complain)
5757 {
5758 tree new_init;
5763 /* The initializer for an array is always a CONSTRUCTOR. */
5767 {
5768 /* Minus 1 is used for zero sized arrays. */
5774 /* sizetype is sign extended, not zero extended. */
5775 else
5777 }
5779 /* Loop until there are no more initializers. */
5783 {
5784 tree elt_init;
5789 complain);
5797 /* This can happen with an invalid initializer (c++/54501). */
5800 }
5803 }
5805 /* Subroutine of reshape_init_r, processes the initializers for arrays.
5806 Parameters are the same of reshape_init_r. */
5808 static tree
5810 {
5819 }
5821 /* Subroutine of reshape_init_r, processes the initializers for vectors.
5822 Parameters are the same of reshape_init_r. */
5824 static tree
5826 {
5832 {
5835 {
5840 }
5843 }
5845 /* For a vector, we initialize it as an array of the appropriate size. */
5850 }
5852 /* Subroutine of reshape_init_r, processes the initializers for classes
5853 or union. Parameters are the same of reshape_init_r. */
5855 static tree
5857 tsubst_flags_t complain)
5858 {
5859 tree field;
5860 tree new_init;
5864 /* The initializer for a class is always a CONSTRUCTOR. */
5869 {
5870 /* [dcl.init.aggr]
5872 An initializer for an aggregate member that is an
5873 empty class shall have the form of an empty
5874 initializer-list {}. */
5876 {
5880 }
5882 }
5884 /* Loop through the initializable fields, gathering initializers. */
5886 {
5887 tree field_init;
5890 /* Handle designated initializers, as an extension. */
5892 {
5897 {
5898 /* We already reshaped this. */
5900 {
5906 }
5907 }
5910 else
5911 {
5916 }
5919 {
5924 }
5925 }
5927 /* If we processed all the member of the class, we are done. */
5937 {
5938 /* This can happen with an invalid initializer for a flexible
5939 array member (c++/54441). */
5943 }
5947 /* [dcl.init.aggr]
5949 When a union is initialized with a brace-enclosed
5950 initializer, the braces shall only contain an
5951 initializer for the first member of the union. */
5956 }
5959 }
5961 /* Subroutine of reshape_init_r. We're in a context where C99 initializer
5962 designators are not valid; either complain or return true to indicate
5963 that reshape_init_r should return error_mark_node. */
5965 static bool
5967 {
5969 {
5973 else
5975 }
5977 }
5979 /* Subroutine of reshape_init, which processes a single initializer (part of
5980 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5981 iterator within the CONSTRUCTOR which points to the initializer to process.
5982 FIRST_INITIALIZER_P is true if this is the first initializer of the
5983 outermost CONSTRUCTOR node. */
5985 static tree
5987 tsubst_flags_t complain)
5988 {
5999 {
6000 /* A complex type can be initialized from one or two initializers,
6001 but braces are not elided. */
6004 {
6006 {
6009 else
6011 }
6012 }
6014 {
6022 }
6024 }
6026 /* A non-aggregate type is always initialized with a single
6027 initializer. */
6029 {
6030 /* It is invalid to initialize a non-aggregate type with a
6031 brace-enclosed initializer before C++0x.
6032 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
6033 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
6034 a CONSTRUCTOR (with a record type). */
6036 /* Don't complain about a capture-init. */
6039 {
6041 {
6043 /* Isn't value-initialization. */
6045 {
6048 type);
6050 }
6051 }
6052 else
6054 }
6058 }
6060 /* "If T is a class type and the initializer list has a single element of
6061 type cv U, where U is T or a class derived from T, the object is
6062 initialized from that element." Even if T is an aggregate. */
6064 && first_initializer_p
6067 {
6070 }
6072 /* [dcl.init.aggr]
6074 All implicit type conversions (clause _conv_) are considered when
6075 initializing the aggregate member with an initializer from an
6076 initializer-list. If the initializer can initialize a member,
6077 the member is initialized. Otherwise, if the member is itself a
6078 non-empty subaggregate, brace elision is assumed and the
6079 initializer is considered for the initialization of the first
6080 member of the subaggregate. */
6082 /* But don't try this for the first initializer, since that would be
6083 looking through the outermost braces; A a2 = { a1 }; is not a
6084 valid aggregate initialization. */
6085 && !first_initializer_p
6088 complain)))
6089 {
6092 }
6094 /* [dcl.init.string]
6096 A char array (whether plain char, signed char, or unsigned char)
6097 can be initialized by a string-literal (optionally enclosed in
6098 braces); a wchar_t array can be initialized by a wide
6099 string-literal (optionally enclosed in braces). */
6102 {
6105 /* Strip one level of braces if and only if they enclose a single
6106 element (as allowed by [dcl.init.string]). */
6110 {
6112 }
6114 /* If it's a string literal, then it's the initializer for the array
6115 as a whole. Otherwise, continue with normal initialization for
6116 array types (one value per array element). */
6118 {
6123 }
6124 }
6126 /* The following cases are about aggregates. If we are not within a full
6127 initializer already, and there is not a CONSTRUCTOR, it means that there
6128 is a missing set of braces (that is, we are processing the case for
6129 which reshape_init exists). */
6131 {
6133 {
6135 /* There is no need to reshape pointer-to-member function
6136 initializers, as they are always constructed correctly
6137 by the front end. */
6138 ;
6140 /* For a nested compound literal, there is no need to reshape since
6141 brace elision is not allowed. Even if we decided to allow it,
6142 we should add a call to reshape_init in finish_compound_literal,
6143 before calling digest_init, so changing this code would still
6144 not be necessary. */
6146 else
6147 {
6151 }
6152 }
6157 type);
6158 }
6160 /* Dispatch to specialized routines. */
6167 else
6169 }
6171 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
6172 brace-enclosed aggregate initializer.
6174 INIT is the CONSTRUCTOR containing the list of initializers describing
6175 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
6176 It may not presently match the shape of the TYPE; for example:
6178 struct S { int a; int b; };
6179 struct S a[] = { 1, 2, 3, 4 };
6181 Here INIT will hold a vector of four elements, rather than a
6182 vector of two elements, each itself a vector of two elements. This
6183 routine transforms INIT from the former form into the latter. The
6184 revised CONSTRUCTOR node is returned. */
6186 tree
6188 {
6190 reshape_iter d;
6191 tree new_init;
6197 /* An empty constructor does not need reshaping, and it is always a valid
6198 initializer. */
6202 /* Handle [dcl.init.list] direct-list-initialization from
6203 single element of enumeration with a fixed underlying type. */
6205 {
6209 {
6213 }
6214 else
6216 }
6218 /* Recurse on this CONSTRUCTOR. */
6226 /* Make sure all the element of the constructor were used. Otherwise,
6227 issue an error about exceeding initializers. */
6229 {
6233 }
6240 }
6242 /* Verify array initializer. Returns true if errors have been reported. */
6244 bool
6246 {
6249 /* The array type itself need not be complete, because the
6250 initializer may tell us how many elements are in the array.
6251 But, the elements of the array must be complete. */
6253 {
6257 else
6260 }
6261 /* A compound literal can't have variable size. */
6265 {
6268 }
6270 }
6272 /* Subroutine of check_initializer; args are passed down from that function.
6273 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
6275 static tree
6278 {
6281 }
6283 /* Verify INIT (the initializer for DECL), and record the
6284 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
6285 grok_reference_init.
6287 If the return value is non-NULL, it is an expression that must be
6288 evaluated dynamically to initialize DECL. */
6290 static tree
6292 {
6295 tree core_type;
6297 /* Things that are going to be initialized need to have complete
6298 type. */
6302 {
6303 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
6304 it doesn't have storage to be initialized. */
6307 }
6310 /* We will have already complained. */
6314 {
6317 }
6319 {
6324 }
6325 else
6326 /* There is no way to make a variable-sized class type in GNU C++. */
6330 {
6333 {
6335 {
6338 }
6340 {
6342 "scalar object %qD requires one element in "
6346 }
6347 }
6348 }
6351 {
6358 }
6360 ;
6363 {
6365 {
6368 }
6371 tf_warning_or_error);
6372 /* Do not reshape constructors of vectors (they don't need to be
6373 reshaped. */
6375 {
6377 {
6379 tf_warning_or_error);
6381 }
6383 {
6384 /* Don't reshape if the class has constructors. */
6387 "in C++98 %qD must be initialized by "
6389 decl);
6390 }
6392 {
6395 }
6396 else
6397 {
6400 }
6401 }
6405 {
6408 /* We get here with code like `int a (2);' */
6410 tf_warning_or_error);
6411 }
6413 /* If DECL has an array type without a specific bound, deduce the
6414 array size from the initializer. */
6428 {
6431 /* A constructor call is a non-trivial initializer even if
6432 it isn't explicitly written. */
6436 /* If this is a constexpr initializer, expand_default_init will
6437 have returned an INIT_EXPR rather than a CALL_EXPR. In that
6438 case, pull the initializer back out and pass it down into
6439 store_init_value. */
6444 {
6447 /* Don't call digest_init; it's unnecessary and will complain
6448 about aggregate initialization of non-aggregate classes. */
6450 }
6452 {
6453 /* Declared constexpr, but no suitable initializer; massage
6454 init appropriately so we can pass it into store_init_value
6455 for the error. */
6458 {
6462 }
6464 }
6465 else
6467 }
6470 {
6471 /* In aggregate initialization of a variable, each element
6472 initialization is a full-expression because there is no
6473 enclosing expression. */
6488 }
6489 }
6490 else
6491 {
6499 tf_warning_or_error);
6500 }
6506 {
6507 /* We might have set these in cp_finish_decl. */
6510 }
6516 {
6524 else
6528 {
6532 }
6534 }
6537 }
6539 /* If DECL is not a local variable, give it RTL. */
6541 static void
6543 {
6547 /* Set the DECL_ASSEMBLER_NAME for the object. */
6549 {
6550 /* The `register' keyword, when used together with an
6551 asm-specification, indicates that the variable should be
6552 placed in a particular register. */
6554 {
6557 }
6558 else
6559 {
6564 }
6565 }
6567 /* Handle non-variables up front. */
6569 {
6572 }
6574 /* If we see a class member here, it should be a static data
6575 member. */
6577 {
6579 /* An in-class declaration of a static data member should be
6580 external; it is only a declaration, and not a definition. */
6585 }
6587 /* We don't create any RTL for local variables. */
6591 /* We defer emission of local statics until the corresponding
6592 DECL_EXPR is expanded. But with constexpr its function might never
6593 be expanded, so go ahead and tell cgraph about the variable now. */
6598 /* Defer template instantiations. */
6603 /* If we're not deferring, go ahead and assemble the variable. */
6606 }
6608 /* walk_tree helper for wrap_temporary_cleanups, below. */
6610 static tree
6612 {
6613 /* Stop at types or full-expression boundaries. */
6616 {
6619 }
6622 {
6627 /* Tell honor_protect_cleanup_actions to handle this as a separate
6628 cleanup. */
6632 }
6635 }
6637 /* We're initializing a local variable which has a cleanup GUARD. If there
6638 are any temporaries used in the initializer INIT of this variable, we
6639 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
6640 variable will be cleaned up properly if one of them throws.
6642 Unfortunately, there's no way to express this properly in terms of
6643 nesting, as the regions for the temporaries overlap the region for the
6644 variable itself; if there are two temporaries, the variable needs to be
6645 the first thing destroyed if either of them throws. However, we only
6646 want to run the variable's cleanup if it actually got constructed. So
6647 we need to guard the temporary cleanups with the variable's cleanup if
6648 they are run on the normal path, but not if they are run on the
6649 exceptional path. We implement this by telling
6650 honor_protect_cleanup_actions to strip the variable cleanup from the
6651 exceptional path. */
6653 static void
6655 {
6657 }
6659 /* Generate code to initialize DECL (a local variable). */
6661 static void
6663 {
6665 tree cleanup;
6673 {
6674 /* If we used it already as memory, it must stay in memory. */
6678 }
6683 /* Compute and store the initial value. */
6688 /* Generate a cleanup, if necessary. */
6691 /* Perform the initialization. */
6693 {
6697 {
6698 /* Stick simple initializers in DECL_INITIAL so that
6699 -Wno-init-self works (c++/34772). */
6704 {
6708 OPT_Winit_self,
6710 }
6711 }
6712 else
6713 {
6716 /* If we're only initializing a single object, guard the
6717 destructors of any temporaries used in its initializer with
6718 its destructor. This isn't right for arrays because each
6719 element initialization is a full-expression. */
6728 saved_stmts_are_full_exprs_p;
6729 }
6730 }
6732 /* Set this to 0 so we can tell whether an aggregate which was
6733 initialized was ever used. Don't do this if it has a
6734 destructor, so we don't complain about the 'resource
6735 allocation is initialization' idiom. Now set
6736 attribute((unused)) on types so decls of that type will be
6737 marked used. (see TREE_USED, above.) */
6739 && ! already_used
6748 }
6750 /* DECL is a VAR_DECL for a compiler-generated variable with static
6751 storage duration (like a virtual table) whose initializer is a
6752 compile-time constant. Initialize the variable and provide it to the
6753 back end. */
6755 void
6757 {
6758 tree init;
6768 }
6770 /* INIT is the initializer for a variable, as represented by the
6771 parser. Returns true iff INIT is value-dependent. */
6773 static bool
6775 {
6777 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
6780 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
6781 {
6794 }
6795 else
6796 /* It must be a simple expression, e.g., int i = 3; */
6800 }
6802 // Returns true if a DECL is VAR_DECL with the concept specifier.
6805 {
6807 // Not all variables have DECL_LANG_SPECIFIC.
6810 }
6812 /* A helper function to be called via walk_tree. If any label exists
6813 under *TP, it is (going to be) forced. Set has_forced_label_in_static. */
6815 static tree
6817 {
6823 }
6825 /* Finish processing of a declaration;
6826 install its line number and initial value.
6827 If the length of an array type is not known before,
6828 it must be determined now, from the initial value, or it is an error.
6830 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
6831 true, then INIT is an integral constant expression.
6833 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
6834 if the (init) syntax was used. */
6836 void
6839 {
6840 tree type;
6845 tree auto_node;
6850 {
6854 }
6857 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
6864 /* Warn about register storage specifiers except when in GNU global
6865 or local register variable extension. */
6867 {
6870 "ISO C++17 does not allow %<register%> storage "
6872 else
6875 }
6877 /* If a name was specified, get the string. */
6892 {
6893 tree d_init;
6895 {
6899 {
6900 /* init is null because we're deferring instantiating the
6901 initializer until we need it. Well, we need it now. */
6904 }
6907 }
6910 {
6914 tf_warning_or_error);
6916 }
6926 {
6931 }
6933 }
6936 {
6939 {
6942 }
6943 }
6951 {
6952 tree clone;
6954 {
6955 /* FIXME check this is 1st decl. */
6960 {
6964 }
6966 }
6968 {
6971 else
6973 }
6974 }
6977 {
6979 /* If DECL is a reference, then we want to know whether init is a
6980 reference constant; init_const_expr_p as passed tells us whether
6981 it's an rvalue constant. */
6985 {
6986 /* Set these flags now for templates. We'll update the flags in
6987 store_init_value for instantiations. */
6990 /* FIXME setting TREE_CONSTANT on refs breaks the back end. */
6993 }
6994 }
6997 {
7000 /* Add this declaration to the statement-tree. */
7007 {
7010 }
7012 /* Generally, initializers in templates are expanded when the
7013 template is instantiated. But, if DECL is a variable constant
7014 then it can be used in future constant expressions, so its value
7015 must be available. */
7022 {
7025 }
7027 && init_const_expr_p
7031 {
7032 /* This variable seems to be a non-dependent constant, so process
7033 its initializer. If check_initializer returns non-null the
7034 initialization wasn't constant after all. */
7035 tree init_code;
7041 }
7043 {
7044 /* Deduce array size even if the initializer is dependent. */
7046 /* And complain about multiple initializers. */
7050 tf_warning_or_error);
7051 }
7054 {
7058 }
7060 {
7063 }
7065 }
7067 /* Just store non-static data member initializers for later. */
7071 /* Take care of TYPE_DECLs up front. */
7073 {
7076 {
7080 }
7082 /* If we have installed this as the canonical typedef for this
7083 type, and that type has not been defined yet, delay emitting
7084 the debug information for it, as we will emit it later. */
7090 at_eof);
7092 }
7094 /* A reference will be modified here, as it is initialized. */
7098 {
7101 }
7104 {
7105 /* If this is a local variable that will need a mangled name,
7106 register it now. We must do this before processing the
7107 initializer for the variable, since the initialization might
7108 require a guard variable, and since the mangled name of the
7109 guard variable will depend on the mangled name of this
7110 variable. */
7114 {
7116 /* Normally has_forced_label_in_static is set during GIMPLE
7117 lowering, but [cd]tors are never actually compiled directly.
7118 We need to set this early so we can deal with the label
7119 address extension. */
7123 {
7126 }
7127 /* And make sure it's in the symbol table for
7128 c_parse_final_cleanups to find. */
7130 }
7132 /* Convert the initializer to the type of DECL, if we have not
7133 already initialized DECL. */
7135 /* If !DECL_EXTERNAL then DECL is being defined. In the
7136 case of a static data member initialized inside the
7137 class-specifier, there can be an initializer even if DECL
7138 is *not* defined. */
7140 {
7144 /* Handle:
7146 [dcl.init]
7148 The memory occupied by any object of static storage
7149 duration is zero-initialized at program startup before
7150 any other initialization takes place.
7152 We cannot create an appropriate initializer until after
7153 the type of DECL is finalized. If DECL_INITIAL is set,
7154 then the DECL is statically initialized, and any
7155 necessary zero-initialization has already been performed. */
7160 /* Remember that the initialization for this variable has
7161 taken place. */
7163 /* This declaration is the definition of this variable,
7164 unless we are initializing a static data member within
7165 the class specifier. */
7168 }
7169 /* If the variable has an array type, lay out the type, even if
7170 there is no initializer. It is valid to index through the
7171 array, and we must get TYPE_ALIGN set correctly on the array
7172 type. */
7179 /* So decl is a global variable or a static member of a
7180 non local class. Record the types it uses
7181 so that we can decide later to emit debug info for them. */
7183 }
7185 /* Add this declaration to the statement-tree. This needs to happen
7186 after the call to check_initializer so that the DECL_EXPR for a
7187 reference temp is added before the DECL_EXPR for the reference itself. */
7189 {
7190 /* If we're building a variable sized type, and we might be
7191 reachable other than via the top of the current binding
7192 level, then create a new BIND_EXPR so that we deallocate
7193 the object at the right time. */
7198 {
7199 tree bind;
7204 }
7206 }
7208 /* Let the middle end know about variables and functions -- but not
7209 static data members in uninstantiated class templates. */
7211 {
7213 {
7216 }
7218 /* This needs to happen after the linkage is set. */
7222 {
7223 /* If a TREE_READONLY variable needs initialization
7224 at runtime, it is no longer readonly and we need to
7225 avoid MEM_READONLY_P being set on RTL created for it. */
7227 {
7231 }
7235 /* Likewise if it needs destruction. */
7238 }
7242 /* Check for abstractness of the type. Notice that there is no
7243 need to strip array types here since the check for those types
7244 is already done within create_array_type_for_decl. */
7248 /* No initialization required. */
7249 ;
7251 {
7253 {
7255 {
7256 /* An out-of-class default definition is defined at
7257 the point where it is explicitly defaulted. */
7262 }
7263 else
7265 }
7266 /* else no initialization required. */
7267 }
7271 {
7274 }
7275 /* A variable definition. */
7277 /* Initialize the local variable. */
7280 /* If a variable is defined, and then a subsequent
7281 definition with external linkage is encountered, we will
7282 get here twice for the same variable. We want to avoid
7283 calling expand_static_init more than once. For variables
7284 that are not static data members, we can call
7285 expand_static_init only when we actually process the
7286 initializer. It is not legal to redeclare a static data
7287 member, so this issue does not arise in that case. */
7290 }
7292 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
7293 reference, insert it in the statement-tree now. */
7295 {
7300 }
7306 }
7308 /* For class TYPE return itself or some its bases that contain
7309 any direct non-static data members. Return error_mark_node if an
7310 error has been diagnosed. */
7312 static tree
7314 {
7324 {
7328 else
7333 }
7335 {
7343 }
7344 else
7354 {
7359 {
7361 {
7366 }
7370 {
7372 "classes %qT and %qT have non-static data "
7375 }
7376 else
7378 }
7379 }
7381 }
7383 /* Return std::tuple_size<TYPE>::value. */
7385 static tree
7387 {
7403 else
7405 }
7407 /* Return std::tuple_element<I,TYPE>::type. */
7409 static tree
7411 {
7419 tf_warning_or_error);
7422 }
7424 /* Return e.get<i>() or get<i>(e). */
7426 static tree
7428 {
7436 /* [The id-expression] e is an lvalue if the type of the entity e is an
7437 lvalue reference and an xvalue otherwise. */
7446 /* To use a member get, member lookup must find at least one
7447 declaration that is a function template
7448 whose first template parameter is a non-type parameter. */
7450 {
7453 {
7457 {
7460 }
7461 }
7462 }
7465 {
7470 }
7471 else
7472 {
7478 }
7479 }
7481 /* It's impossible to recover the decltype of a tuple decomposition variable
7482 based on the actual type of the variable, so store it in a hash table. */
7485 static void
7487 {
7491 }
7493 tree
7495 {
7497 }
7499 /* Mangle a decomposition declaration if needed. Arguments like
7500 in cp_finish_decomp. */
7502 void
7504 {
7508 {
7516 }
7517 }
7519 /* Finish a decomposition declaration. DECL is the underlying declaration
7520 "e", FIRST is the head of a chain of decls for the individual identifiers
7521 chained through DECL_CHAIN in reverse order and COUNT is the number of
7522 those decls. */
7524 void
7526 {
7528 {
7529 error_out:
7531 {
7534 {
7537 }
7539 }
7543 }
7547 /* This happens for range for when not in templates.
7548 Still add the DECL_VALUE_EXPRs for later processing. */
7549 || (!processing_template_decl
7551 {
7553 {
7555 {
7561 }
7565 }
7567 }
7573 {
7576 }
7582 {
7588 {
7590 type);
7592 }
7593 }
7598 {
7599 tree nelts;
7604 {
7607 }
7610 {
7611 cnt_mismatch:
7616 else
7625 }
7628 {
7636 NULL_TREE);
7639 }
7640 }
7641 /* 2 GNU extensions. */
7643 {
7649 {
7657 t);
7660 }
7661 }
7663 {
7665 {
7668 }
7673 {
7683 NULL_TREE);
7686 }
7687 }
7689 {
7691 {
7695 }
7697 {
7704 }
7710 {
7721 {
7725 }
7726 /* Save the decltype away before reference collapse. */
7732 {
7733 /* In this case the names are variables, not just proxies. */
7736 }
7740 }
7741 /* Ignore reads from the underlying decl performed during initialization
7742 of the individual variables. If those will be read, we'll mark
7743 the underlying decl as read at that point. */
7745 }
7747 {
7750 }
7752 {
7755 }
7757 {
7760 }
7763 type);
7764 else
7765 {
7770 {
7774 }
7780 else
7781 eltscnt++;
7786 {
7790 }
7797 else
7798 {
7800 NULL_TREE);
7806 {
7809 }
7810 i++;
7811 }
7812 }
7814 {
7817 {
7822 }
7823 }
7824 }
7826 /* Returns a declaration for a VAR_DECL as if:
7828 extern "C" TYPE NAME;
7830 had been seen. Used to create compiler-generated global
7831 variables. */
7833 static tree
7835 {
7836 tree decl;
7844 /* If the user has explicitly declared this variable (perhaps
7845 because the code we are compiling is part of a low-level runtime
7846 library), then it is possible that our declaration will be merged
7847 with theirs by pushdecl. */
7853 }
7855 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
7856 if "__cxa_atexit" is not being used) corresponding to the function
7857 to be called when the program exits. */
7859 static tree
7861 {
7862 tree fn_type;
7865 {
7866 tree arg_type;
7869 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
7871 else
7872 /* The parameter to "atexit" is "void (*)(void)". */
7878 }
7881 }
7883 /* Returns a pointer to the `atexit' function. Note that if
7884 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
7885 `__cxa_atexit' function specified in the IA64 C++ ABI. */
7887 static tree
7889 {
7890 tree atexit_fndecl;
7891 tree fn_type;
7892 tree fn_ptr_type;
7900 {
7901 /* The declaration for `__cxa_atexit' is:
7903 int __cxa_atexit (void (*)(void *), void *, void *)
7905 We build up the argument types and then the function type
7906 itself. */
7910 /* First, build the pointer-to-function type for the first
7911 argument. */
7913 /* Then, build the rest of the argument types. */
7916 {
7919 }
7920 else
7921 {
7924 }
7925 /* And the final __cxa_atexit type. */
7928 NULL_TREE);
7931 else
7933 }
7934 else
7935 {
7936 /* The declaration for `atexit' is:
7938 int atexit (void (*)());
7940 We build up the argument types and then the function type
7941 itself. */
7943 /* Build the final atexit type. */
7947 }
7949 /* Now, build the function declaration. */
7957 }
7959 /* Like get_atexit_node, but for thread-local cleanups. */
7961 static tree
7963 {
7964 /* The declaration for `__cxa_thread_atexit' is:
7966 int __cxa_thread_atexit (void (*)(void *), void *, void *) */
7970 NULL_TREE);
7972 /* Now, build the function declaration. */
7976 }
7978 /* Returns the __dso_handle VAR_DECL. */
7980 static tree
7982 {
7986 /* Declare the variable. */
7988 ptr_type_node);
7990 #ifdef HAVE_GAS_HIDDEN
7992 {
7995 }
7996 #endif
7999 }
8001 /* Begin a new function with internal linkage whose job will be simply
8002 to destroy some particular variable. */
8006 static tree
8008 {
8010 tree fntype;
8011 tree fndecl;
8017 /* No need to mangle this. */
8020 /* Build the name of the function. */
8022 /* Build the function declaration. */
8025 /* It's a function with internal linkage, generated by the
8026 compiler. */
8029 /* Make the function `inline' so that it is only emitted if it is
8030 actually needed. It is unlikely that it will be inlined, since
8031 it is only called via a function pointer, but we avoid unnecessary
8032 emissions this way. */
8035 /* Build the parameter. */
8037 {
8042 }
8050 }
8052 /* Finish the cleanup function begun by start_cleanup_fn. */
8054 static void
8056 {
8060 }
8062 /* Generate code to handle the destruction of DECL, an object with
8063 static storage duration. */
8065 tree
8067 {
8068 tree cleanup;
8069 tree addr;
8070 tree compound_stmt;
8071 tree fcall;
8072 tree type;
8075 tree atex_node;
8081 /* If we're using "__cxa_atexit" (or "__cxa_thread_atexit" or
8082 "__aeabi_atexit"), and DECL is a class object, we can just pass the
8083 destructor to "__cxa_atexit"; we don't have to build a temporary
8084 function to do the cleanup. */
8085 dso_parm = (flag_use_cxa_atexit
8090 {
8093 /* Make sure it is accessible. */
8095 tf_warning_or_error);
8096 }
8097 else
8098 {
8099 /* Call build_cleanup before we enter the anonymous function so
8100 that any access checks will be done relative to the current
8101 scope, rather than the scope of the anonymous function. */
8104 /* Now start the function. */
8107 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
8108 to the original function, rather than the anonymous one. That
8109 will make the back end think that nested functions are in use,
8110 which causes confusion. */
8115 /* Create the body of the anonymous function. */
8120 }
8122 /* Call atexit with the cleanup function. */
8128 else
8132 {
8133 /* We must convert CLEANUP to the type that "__cxa_atexit"
8134 expects. */
8136 /* "__cxa_atexit" will pass the address of DECL to the
8137 cleanup function. */
8140 /* The declared type of the parameter to "__cxa_atexit" is
8141 "void *". For plain "T*", we could just let the
8142 machinery in cp_build_function_call convert it -- but if the
8143 type is "cv-qualified T *", then we need to convert it
8144 before passing it in, to avoid spurious errors. */
8146 }
8147 else
8148 /* Since the cleanup functions we build ignore the address
8149 they're given, there's no reason to pass the actual address
8150 in, and, in general, it's cheaper to pass NULL than any
8151 other value. */
8156 tf_warning_or_error);
8158 /* Just pass NULL to the dso handle parm if we don't actually
8159 have a DSO handle on this target. */
8161 else
8165 {
8168 {
8171 }
8172 else
8173 {
8176 }
8177 }
8178 else
8179 {
8182 }
8185 }
8187 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
8188 is its initializer. Generate code to handle the construction
8189 and destruction of DECL. */
8191 static void
8193 {
8197 /* Some variables require no dynamic initialization. */
8199 {
8200 /* Make sure the destructor is callable. */
8204 }
8208 {
8212 else
8217 {
8219 "C++11 %<thread_local%> allows dynamic initialization "
8222 }
8224 }
8227 {
8228 /* Emit code to perform this initialization but once. */
8233 /* We don't need thread-safety code for thread-local vars. */
8237 /* Emit code to perform this initialization but once. This code
8238 looks like:
8240 static <type> guard;
8241 if (!__atomic_load (guard.first_byte)) {
8242 if (__cxa_guard_acquire (&guard)) {
8243 bool flag = false;
8244 try {
8245 // Do initialization.
8246 flag = true; __cxa_guard_release (&guard);
8247 // Register variable for destruction at end of program.
8248 } catch {
8249 if (!flag) __cxa_guard_abort (&guard);
8250 }
8251 }
8252 }
8254 Note that the `flag' variable is only set to 1 *after* the
8255 initialization is complete. This ensures that an exception,
8256 thrown during the construction, will cause the variable to
8257 reinitialized when we pass through this code again, as per:
8259 [stmt.dcl]
8261 If the initialization exits by throwing an exception, the
8262 initialization is not complete, so it will be tried again
8263 the next time control enters the declaration.
8265 This process should be thread-safe, too; multiple threads
8266 should not be able to initialize the variable more than
8267 once. */
8269 /* Create the guard variable. */
8272 /* Begin the conditional initialization. */
8279 {
8292 acquire_fn = push_library_fn
8295 NULL_TREE),
8300 NULL_TREE);
8310 inner_if_stmt);
8318 void_node,
8322 /* Do the initialization itself. */
8324 init = add_stmt_to_compound
8326 init = add_stmt_to_compound
8328 }
8329 else
8332 /* Use atexit to register a function for destroying this static
8333 variable. */
8339 {
8343 }
8348 }
8351 else
8353 }
8355 \f
8356 /* Make TYPE a complete type based on INITIAL_VALUE.
8357 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
8358 2 if there was no information (in which case assume 0 if DO_DEFAULT),
8359 3 if the initializer list is empty (in pedantic mode). */
8361 int
8363 {
8367 /* Don't get confused by a CONSTRUCTOR for some other type. */
8374 {
8376 tree value;
8378 /* An array of character type can be initialized from a
8379 brace-enclosed string constant.
8381 FIXME: this code is duplicated from reshape_init. Probably
8382 we should just call reshape_init here? */
8386 {
8393 }
8395 /* If any of the elements are parameter packs, we can't actually
8396 complete this type now because the array size is dependent. */
8398 {
8401 {
8404 }
8405 }
8406 }
8410 /* We can create the array before the element type is complete, which
8411 means that we didn't have these two bits set in the original type
8412 either. In completing the type, we are expected to propagate these
8413 bits. See also complete_type which does the same thing for arrays
8414 of fixed size. */
8417 {
8422 }
8425 }
8427 /* As above, but either give an error or reject zero-size arrays, depending
8428 on COMPLAIN. */
8430 int
8433 {
8436 /* In SFINAE context we can't be lenient about zero-size arrays. */
8443 {
8449 {
8452 }
8456 }
8458 }
8459 \f
8460 /* Return zero if something is declared to be a member of type
8461 CTYPE when in the context of CUR_TYPE. STRING is the error
8462 message to print in that case. Otherwise, quietly return 1. */
8464 static int
8466 {
8468 {
8471 else
8474 }
8476 }
8477 \f
8478 /* Subroutine of `grokdeclarator'. */
8480 /* Generate errors possibly applicable for a given set of specifiers.
8481 This is for ARM $7.1.2. */
8483 static void
8491 {
8493 {
8530 }
8534 && !flag_noexcept_type
8540 }
8542 /* DECL is a member function or static data member and is presently
8543 being defined. Check that the definition is taking place in a
8544 valid namespace. */
8546 static void
8548 {
8549 /* These checks only apply to member functions and static data
8550 members. */
8552 /* We check for problems with specializations in pt.c in
8553 check_specialization_namespace, where we can issue better
8554 diagnostics. */
8557 /* We check this in check_explicit_instantiation_namespace. */
8560 /* [class.mfct]
8562 A member function definition that appears outside of the
8563 class definition shall appear in a namespace scope enclosing
8564 the class definition.
8566 [class.static.data]
8568 The definition for a static data member shall appear in a
8569 namespace scope enclosing the member's class definition. */
8573 }
8575 /* Build a PARM_DECL for the "this" parameter of FN. TYPE is the
8576 METHOD_TYPE for a non-static member function; QUALS are the
8577 cv-qualifiers that apply to the function. */
8579 tree
8581 {
8582 tree this_type;
8583 tree qual_type;
8584 tree parm;
8585 cp_cv_quals this_quals;
8588 {
8589 this_type
8592 }
8593 else
8595 /* The `this' parameter is implicitly `const'; it cannot be
8596 assigned to. */
8602 }
8604 /* DECL is a static member function. Complain if it was declared
8605 with function-cv-quals. */
8607 static void
8609 {
8612 decl);
8613 }
8615 // Check that FN takes no arguments and returns bool.
8616 static void
8618 {
8619 // A constraint is nullary.
8623 // The declared return type of the concept shall be bool, and
8624 // it shall not be deduced from it definition.
8630 }
8632 /* Helper function. Replace the temporary this parameter injected
8633 during cp_finish_omp_declare_simd with the real this parameter. */
8635 static tree
8637 {
8646 }
8648 /* CTYPE is class type, or null if non-class.
8649 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
8650 or METHOD_TYPE.
8651 DECLARATOR is the function's name.
8652 PARMS is a chain of PARM_DECLs for the function.
8653 VIRTUALP is truthvalue of whether the function is virtual or not.
8654 FLAGS are to be passed through to `grokclassfn'.
8655 QUALS are qualifiers indicating whether the function is `const'
8656 or `volatile'.
8657 RAISES is a list of exceptions that this function can raise.
8658 CHECK is 1 if we must find this method in CTYPE, 0 if we should
8659 not look, and -1 if we should not call `grokclassfn' at all.
8661 SFK is the kind of special function (if any) for the new function.
8663 Returns `NULL_TREE' if something goes wrong, after issuing
8664 applicable error messages. */
8666 static tree
8668 tree type,
8669 tree declarator,
8670 tree parms,
8671 tree orig_declarator,
8672 tree decl_reqs,
8675 cp_cv_quals quals,
8676 cp_ref_qualifier rqual,
8677 tree raises,
8683 special_function_kind sfk,
8686 tree in_namespace,
8688 location_t location)
8689 {
8690 tree decl;
8692 tree t;
8694 // Was the concept specifier present?
8697 // Concept declarations must have a corresponding definition.
8699 {
8702 }
8711 /* Set the constraints on the declaration. */
8713 {
8718 /* Adjust the required expression into a constraint. */
8724 }
8726 /* If we have an explicit location, use it, otherwise use whatever
8727 build_lang_decl used (probably input_location). */
8732 {
8737 /* Allocate space to hold the vptr bit if needed. */
8739 }
8745 /* Propagate volatile out from type to decl. */
8749 /* Setup decl according to sfk. */
8751 {
8764 }
8767 {
8770 orig_declarator);
8771 else
8772 {
8777 {
8778 /* Something like `template <class T> friend void f<T>()'. */
8781 orig_declarator);
8783 }
8786 /* A friend declaration of the form friend void f<>(). Record
8787 the information in the TEMPLATE_ID_EXPR. */
8796 {
8799 decl);
8801 }
8804 {
8807 decl);
8809 }
8810 }
8811 }
8813 /* If this decl has namespace scope, set that up. */
8819 /* `main' and builtins have implicit 'C' linkage. */
8834 /* Should probably propagate const out from type to decl I bet (mrs). */
8836 {
8839 }
8845 {
8849 }
8852 {
8863 }
8865 /* Members of anonymous types and local classes have no linkage; make
8866 them internal. If a typedef is made later, this will be changed. */
8872 {
8873 /* [basic.link]: A name with no linkage (notably, the name of a class
8874 or enumeration declared in a local scope) shall not be used to
8875 declare an entity with linkage.
8877 DR 757 relaxes this restriction for C++0x. */
8879 }
8883 {
8886 }
8888 /* If the declaration was declared inline, mark it as such. */
8890 {
8894 }
8898 // If the concept declaration specifier was found, check
8899 // that the declaration satisfies the necessary requirements.
8901 {
8904 }
8908 {
8911 TYPE_UNQUALIFIED,
8912 REF_QUAL_NONE);
8915 {
8919 decl);
8921 }
8924 {
8928 decl);
8930 }
8931 }
8934 {
8936 {
8940 }
8944 }
8949 {
8953 /* [over.literal]/6: Literal operators shall not have C linkage. */
8955 {
8959 }
8962 {
8965 {
8968 }
8972 {
8976 }
8978 {
8982 }
8983 /* 17.6.3.3.5 */
8988 "literal operator suffixes not preceded by %<_%>"
8990 }
8991 else
8992 {
8995 }
8996 }
8999 /* Make the init_value nonzero so pushdecl knows this is not
9000 tentative. error_mark_node is replaced later with the BLOCK. */
9007 {
9008 /* Adjust "omp declare simd" attributes. */
9011 {
9012 tree attr;
9015 {
9020 {
9022 cl = c_omp_declare_simd_clauses_to_numbers
9026 else
9028 }
9029 }
9030 }
9031 }
9033 /* Caller will do the rest of this. */
9040 /* 12.4/3 */
9048 template_count,
9060 {
9063 }
9065 /* Check main's type after attributes have been applied. */
9067 {
9069 integer_type_node))
9070 {
9072 tree newtype;
9076 }
9079 }
9082 {
9084 (processing_template_decl
9086 ? current_template_parms
9093 {
9094 tree ok;
9095 tree pushed_scope;
9098 /* Because grokfndecl is always supposed to return a
9099 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
9100 here. We depend on our callers to figure out that its
9101 really a template that's being returned. */
9106 {
9107 /* Remove the `this' parm added by grokclassfn. */
9110 }
9112 {
9115 }
9117 {
9122 }
9124 /* Since we've smashed OLD_DECL to its
9125 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
9129 /* Attempt to merge the declarations. This can fail, in
9130 the case of some invalid specialization declarations. */
9136 {
9140 }
9144 }
9145 }
9157 }
9159 /* decl is a FUNCTION_DECL.
9160 specifiers are the parsed virt-specifiers.
9162 Set flags to reflect the virt-specifiers.
9164 Returns decl. */
9166 static tree
9168 {
9176 }
9178 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
9179 the linkage that DECL will receive in the object file. */
9181 static void
9183 {
9184 /* A static data member always has static storage duration and
9185 external linkage. Note that static data members are forbidden in
9186 local classes -- the only situation in which a class has
9187 non-external linkage. */
9190 /* For non-template classes, static data members are always put
9191 out in exactly those files where they are defined, just as
9192 with ordinary namespace-scope variables. */
9195 }
9197 /* Create a VAR_DECL named NAME with the indicated TYPE.
9199 If SCOPE is non-NULL, it is the class type or namespace containing
9200 the variable. If SCOPE is NULL, the variable should is created in
9201 the innermost enclosing scope. */
9203 static tree
9205 tree name,
9206 tree orig_declarator,
9213 tree scope)
9214 {
9215 tree decl;
9216 tree explicit_scope;
9223 /* Compute the scope in which to place the variable, but remember
9224 whether or not that scope was explicitly specified by the user. */
9227 {
9228 /* An explicit "extern" specifier indicates a namespace-scope
9229 variable. */
9234 }
9238 template, we need DECL_LANG_SPECIFIC. */
9240 /* Similarly for namespace-scope variables with language linkage
9241 other than C++. */
9244 /* Similarly for static data members. */
9246 /* Similarly for explicit specializations. */
9247 || (orig_declarator
9250 else
9255 else
9259 {
9262 }
9265 {
9267 /* This function is only called with out-of-class definitions. */
9270 }
9271 /* At top level, either `static' or no s.c. makes a definition
9272 (perhaps tentative), and absence of `static' makes it public. */
9274 {
9277 || ! constp
9278 || volatilep
9281 }
9282 /* Not at top level, only `static' makes a static definition. */
9283 else
9284 {
9287 }
9290 {
9292 {
9296 }
9299 }
9301 /* If the type of the decl has no linkage, make sure that we'll
9302 notice that in mark_used. */
9311 {
9312 /* [basic.link]: A name with no linkage (notably, the name of a class
9313 or enumeration declared in a local scope) shall not be used to
9314 declare an entity with linkage.
9316 DR 757 relaxes this restriction for C++0x. */
9319 }
9320 else
9328 /* Check that the variable can be safely declared as a concept.
9329 Note that this also forbids explicit specializations. */
9331 {
9333 {
9336 }
9337 else
9342 }
9345 {
9349 }
9351 // Handle explicit specializations and instantiations of variable templates.
9357 }
9359 /* Create and return a canonical pointer to member function type, for
9360 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
9362 tree
9364 {
9366 tree t;
9371 /* Make sure that we always have the unqualified pointer-to-member
9372 type first. */
9374 {
9377 }
9379 /* If a canonical type already exists for this type, use it. We use
9380 this method instead of type_hash_canon, because it only does a
9381 simple equality check on the list of field members. */
9389 /* Let the front end know this is a pointer to member function. */
9396 delta_type_node);
9402 /* Zap out the name so that the back end will give us the debugging
9403 information for this anonymous RECORD_TYPE. */
9406 /* Cache this pointer-to-member type so that we can find it again
9407 later. */
9416 }
9418 /* Create and return a pointer to data member type. */
9420 tree
9422 {
9424 {
9429 }
9430 else
9431 {
9434 }
9435 }
9437 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
9438 Check to see that the definition is valid. Issue appropriate error
9439 messages. Return 1 if the definition is particularly bad, or 0
9440 otherwise. */
9442 static int
9444 {
9445 /* Avoid redundant diagnostics on out-of-class definitions. */
9448 /* Can't check yet if we don't know the type. */
9451 /* If DECL is declared constexpr, we'll do the appropriate checks
9452 in check_initializer. Similarly for inline static data members. */
9458 {
9461 "in-class initialization of static data member %q#D of "
9465 "%<constexpr%> needed for in-class initialization of "
9467 else
9469 "in-class initialization of static data member %q#D of "
9472 }
9474 /* Motion 10 at San Diego: If a static const integral data member is
9475 initialized with an integral constant expression, the initializer
9476 may appear either in the declaration (within the class), or in
9477 the definition, but not both. If it appears in the class, the
9478 member is a member constant. The file-scope definition is always
9479 required. */
9481 {
9483 "invalid in-class initialization of static data member "
9485 type);
9487 }
9490 "ISO C++ forbids in-class initialization of non-const "
9492 decl);
9495 "ISO C++ forbids initialization of member constant "
9499 }
9501 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
9502 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
9503 expressions out into temporary variables so that walk_tree doesn't
9504 step into them (c++/15764). */
9506 static tree
9508 {
9512 {
9518 }
9522 }
9524 /* Entry point for the above. */
9526 static void
9528 {
9530 /* Break out any function calls into temporary variables. */
9532 }
9534 /* Reduce a SIZEOF_EXPR to its value. */
9536 tree
9538 {
9539 tree r;
9546 else
9552 }
9554 /* Given the SIZE (i.e., number of elements) in an array, compute
9555 an appropriate index type for the array. If non-NULL, NAME is
9556 the name of the entity being declared. */
9558 tree
9560 {
9561 tree itype;
9568 {
9573 /* In C++98, we mark a non-constant array bound with a magic
9575 else
9576 {
9583 }
9588 /* The array bound must be an integer type. */
9591 {
9596 else
9599 }
9600 }
9602 /* A type is dependent if it is...an array type constructed from any
9603 dependent type or whose size is specified by a constant expression
9604 that is value-dependent. */
9605 /* We can only call value_dependent_expression_p on integral constant
9606 expressions; treat non-constant expressions as dependent, too. */
9610 {
9611 /* We cannot do any checking for a SIZE that isn't known to be
9612 constant. Just build the index type and mark that it requires
9613 structural equality checks. */
9620 }
9623 {
9628 /* Use the folded result for VLAs, too; it will have resolved
9629 SIZEOF_EXPR. */
9631 }
9633 /* Normally, the array-bound will be a constant. */
9635 {
9636 /* An array must have a positive number of elements. */
9638 {
9644 else
9647 }
9648 /* As an extension we allow zero-sized arrays. */
9650 {
9652 /* We must fail if performing argument deduction (as
9653 indicated by the state of complain), so that
9654 another substitution can be found. */
9660 else
9662 }
9663 }
9665 /* We don't allow VLAs at non-function scopes, or during
9666 tentative template substitution. */
9669 {
9672 /* `(int) &fn' is not a valid array bound. */
9675 name);
9676 else
9679 }
9681 {
9684 else
9686 }
9688 {
9692 else
9695 }
9698 /* A variable sized array. */
9700 else
9701 {
9702 /* Compute the index of the largest element in the array. It is
9703 one less than the number of elements in the array. We save
9704 and restore PROCESSING_TEMPLATE_DECL so that computations in
9705 cp_build_binary_op will be appropriately folded. */
9706 {
9707 processing_template_decl_sentinel s;
9709 MINUS_EXPR,
9712 complain),
9713 complain);
9715 }
9718 {
9719 /* A variable sized array. */
9726 {
9727 /* We have to add 1 -- in the ubsan routine we generate
9728 LE_EXPR rather than LT_EXPR. */
9733 }
9734 }
9735 /* Make sure that there was no overflow when creating to a signed
9736 index type. (For example, on a 32-bit machine, an array with
9737 size 2^32 - 1 is too big.) */
9740 {
9745 }
9746 }
9748 /* Create and return the appropriate index type. */
9751 /* If the index type were dependent, we would have returned early, so
9752 remember that it isn't. */
9756 }
9758 /* Returns the scope (if any) in which the entity declared by
9759 DECLARATOR will be located. If the entity was declared with an
9760 unqualified name, NULL_TREE is returned. */
9762 tree
9764 {
9768 /* If the declarator-id is a SCOPE_REF, the scope in which the
9769 declaration occurs is the first operand. */
9774 /* Otherwise, the declarator is not a qualified name; the entity will
9775 be declared in the current scope. */
9777 }
9779 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
9780 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
9781 with this type. */
9783 static tree
9785 {
9788 /* If things have already gone awry, bail now. */
9792 /* 8.3.4/1: If the type of the identifier of D contains the auto
9793 type-specifier, the program is ill-formed. */
9795 {
9798 }
9800 /* If there are some types which cannot be array elements,
9801 issue an error-message and return. */
9803 {
9807 else
9814 else
9821 else
9828 else
9834 }
9836 /* [dcl.array]
9838 The constant expressions that specify the bounds of the arrays
9839 can be omitted only for the first member of the sequence. */
9841 {
9845 name);
9846 else
9851 }
9853 /* Figure out the index type for the array. */
9857 /* [dcl.array]
9858 T is called the array element type; this type shall not be [...] an
9859 abstract class type. */
9863 }
9865 /* Returns the smallest location != UNKNOWN_LOCATION among the
9866 three stored in LOCATIONS[ds_const], LOCATIONS[ds_volatile],
9867 and LOCATIONS[ds_restrict]. */
9869 static location_t
9871 {
9886 }
9888 /* Check that it's OK to declare a function with the indicated TYPE
9889 and TYPE_QUALS. SFK indicates the kind of special function (if any)
9890 that this function is. OPTYPE is the type given in a conversion
9891 operator declaration, or the class type for a constructor/destructor.
9892 Returns the actual return type of the function; that may be different
9893 than TYPE if an error occurs, or for certain special functions. */
9895 static tree
9897 tree type,
9898 tree optype,
9901 {
9903 {
9913 else
9924 /* We can't use the proper return type here because we run into
9925 problems with ambiguous bases and covariant returns. */
9928 else
9937 "qualifiers are not allowed on declaration of "
9948 "qualifiers are not allowed on declaration of "
9951 {
9955 }
9956 else
9966 }
9969 }
9971 /* A variable or data member (whose unqualified name is IDENTIFIER)
9972 has been declared with the indicated TYPE. If the TYPE is not
9973 acceptable, issue an error message and return a type to use for
9974 error-recovery purposes. */
9976 tree
9978 {
9980 {
9984 {
9987 }
9988 else
9991 }
9994 }
9996 /* Handle declaring DECL as an inline variable. */
9998 static void
10000 {
10003 {
10007 }
10010 "inline variables are only available "
10013 {
10016 }
10017 }
10020 /* Assign a typedef-given name to a class or enumeration type declared
10021 as anonymous at first. This was split out of grokdeclarator
10022 because it is also used in libcc1. */
10024 void
10026 {
10029 /* Replace the anonymous name with the real name everywhere. */
10031 {
10033 /* We do not rename the debug info representing the
10034 unnamed tagged type because the standard says in
10035 [dcl.typedef] that the naming applies only for
10036 linkage purposes. */
10037 /*debug_hooks->set_name (t, decl);*/
10039 }
10044 /* If this is a typedef within a template class, the nested
10045 type is a (non-primary) template. The name for the
10046 template needs updating as well. */
10051 /* Adjust linkage now that we aren't unnamed anymore. */
10054 /* FIXME remangle member functions; member functions of a
10055 type with external linkage have external linkage. */
10057 /* Check that our job is done, and that it would fail if we
10058 attempted to do it again. */
10060 }
10062 /* Given declspecs and a declarator (abstract or otherwise), determine
10063 the name and type of the object declared and construct a DECL node
10064 for it.
10066 DECLSPECS points to the representation of declaration-specifier
10067 sequence that precedes declarator.
10069 DECL_CONTEXT says which syntactic context this declaration is in:
10070 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
10071 FUNCDEF for a function definition. Like NORMAL but a few different
10072 error messages in each case. Return value may be zero meaning
10073 this definition is too screwy to try to parse.
10074 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
10075 handle member functions (which have FIELD context).
10076 Return value may be zero meaning this definition is too screwy to
10077 try to parse.
10078 PARM for a parameter declaration (either within a function prototype
10079 or before a function body). Make a PARM_DECL, or return void_type_node.
10080 TPARM for a template parameter declaration.
10081 CATCHPARM for a parameter declaration before a catch clause.
10082 TYPENAME if for a typename (in a cast or sizeof).
10083 Don't make a DECL node; just return the ..._TYPE node.
10084 FIELD for a struct or union field; make a FIELD_DECL.
10085 BITFIELD for a field with specified width.
10087 INITIALIZED is as for start_decl.
10089 ATTRLIST is a pointer to the list of attributes, which may be NULL
10090 if there are none; *ATTRLIST may be modified if attributes from inside
10091 the declarator should be applied to the declaration.
10093 When this function is called, scoping variables (such as
10094 CURRENT_CLASS_TYPE) should reflect the scope in which the
10095 declaration occurs, not the scope in which the new declaration will
10096 be placed. For example, on:
10098 void S::f() { ... }
10100 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
10101 should not be `S'.
10103 Returns a DECL (if a declarator is present), a TYPE (if there is no
10104 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
10105 error occurs. */
10107 tree
10113 {
10125 /* True if this declarator is a function definition. */
10129 #if 0
10130 /* See the code below that used this. */
10132 #endif
10134 /* Keep track of what sort of function is being processed
10135 so that we can warn about default return values, or explicit
10136 return values which do not match prescribed defaults. */
10142 /* cv-qualifiers that apply to the declarator, for a declaration of
10143 a member function. */
10145 /* virt-specifiers that apply to the declarator, for a declaration of
10146 a member function. */
10148 /* ref-qualifier that applies to the declarator, for a declaration of
10149 a member function. */
10151 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
10158 /* The unqualified name of the declarator; either an
10159 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
10160 tree unqualified_id;
10161 /* The class type, if any, in which this entity is located,
10162 or NULL_TREE if none. Note that this value may be different from
10163 the current class type; for example if an attempt is made to declare
10164 "A::f" inside "B", this value will be "A". */
10166 /* The NAMESPACE_DECL for the namespace in which this entity is
10167 located. If an unqualified name is used to declare the entity,
10168 this value will be NULL_TREE, even if the entity is located at
10169 namespace scope. */
10171 cp_storage_class storage_class;
10192 // Was concept_p specified? Note that ds_concept
10193 // implies ds_constexpr!
10226 /* Look inside a declarator for the name being declared
10227 and get it as a string, for an error message. */
10229 id_declarator;
10231 {
10236 {
10240 {
10244 }
10248 {
10254 {
10256 {
10257 /* [dcl.meaning]
10259 A declarator-id shall not be qualified except
10260 for ...
10262 None of the cases are permitted in block
10263 scope. */
10266 decl);
10270 else
10274 }
10276 {
10279 {
10282 }
10284 && current_class_type
10286 current_class_type))
10287 {
10291 }
10292 }
10295 }
10297 {
10299 {
10301 {
10304 }
10307 {
10310 }
10317 }
10321 {
10327 }
10328 /* Fall through. */
10335 {
10337 dname);
10339 }
10342 else
10343 {
10350 else
10352 }
10357 }
10359 }
10376 }
10379 }
10381 /* [dcl.fct.edf]
10383 The declarator in a function-definition shall have the form
10384 D1 ( parameter-declaration-clause) ... */
10386 {
10389 }
10394 {
10397 }
10400 {
10403 {
10406 }
10409 {
10411 {
10414 }
10416 {
10419 }
10420 }
10421 }
10423 /* Anything declared one level down from the top level
10424 must be one of the parameters of a function
10425 (because the body is at least two levels down). */
10427 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
10428 by not allowing C++ class definitions to specify their parameters
10429 with xdecls (must be spec.d in the parmlist).
10431 Since we now wait to push a class scope until we are sure that
10432 we are in a legitimate method context, we must set oldcname
10433 explicitly (since current_class_name is not yet alive).
10435 We also want to avoid calling this a PARM if it is in a namespace. */
10438 {
10444 }
10450 {
10453 }
10456 {
10459 }
10461 /* If there were multiple types specified in the decl-specifier-seq,
10462 issue an error message. */
10464 {
10467 }
10470 {
10473 }
10475 /* Extract the basic type from the decl-specifier-seq. */
10478 {
10481 }
10482 /* If the entire declaration is itself tagged as deprecated then
10483 suppress reports of deprecated items. */
10488 {
10495 }
10496 /* No type at all: default to `int', and set DEFAULTED_INT
10497 because it was not a user-defined typedef. */
10499 {
10501 {
10502 /* These imply 'int'. */
10505 }
10506 /* If we just have "complex", it is equivalent to "complex double". */
10509 {
10512 "ISO C++ does not support plain %<complex%> meaning "
10514 }
10515 }
10516 /* Gather flags. */
10520 #if 0
10521 /* See the code below that used this. */
10524 #endif
10529 else
10533 {
10535 ctor_return_type,
10536 type_quals,
10539 }
10541 {
10546 /* We handle `main' specially here, because 'main () { }' is so
10547 common. With no options, it is allowed. With -Wreturn-type,
10548 it is a warning. It is only an error with -pedantic-errors. */
10549 is_main = (funcdef_flag
10565 else
10570 /* FIXME we should be able to propagate the error_mark_node as is
10571 for other contexts too. */
10573 else
10575 }
10580 {
10582 {
10586 }
10591 }
10593 /* Now process the modifiers that were specified
10594 and check for invalid combinations. */
10596 /* Long double is a special combination. */
10598 {
10602 }
10604 /* Check all other uses of type modifiers. */
10607 {
10608 location_t loc;
10611 {
10614 }
10616 {
10619 }
10621 {
10624 }
10626 {
10629 }
10631 {
10634 }
10649 {
10651 {
10655 }
10658 else
10660 }
10661 else
10664 /* Discard the type modifiers if they are invalid. */
10666 {
10672 }
10673 }
10675 /* Decide whether an integer type is signed or not.
10676 Optionally treat bitfields as signed by default. */
10678 /* [class.bit]
10680 It is implementation-defined whether a plain (neither
10681 explicitly signed or unsigned) char, short, int, or long
10682 bit-field is signed or unsigned.
10684 Naturally, we extend this to long long as well. Note that
10685 this does not include wchar_t. */
10687 && !signed_p
10688 /* A typedef for plain `int' without `signed' can be
10689 controlled just like plain `int', but a typedef for
10690 `signed int' cannot be so controlled. */
10691 && !(typedef_decl
10695 {
10708 else
10710 }
10723 {
10726 /* If a modifier is specified, the resulting complex is the complex
10727 form of TYPE. E.g, "complex short" is "complex short int". */
10736 else
10738 }
10740 /* If we're using the injected-class-name to form a compound type or a
10741 declaration, replace it with the underlying class so we don't get
10742 redundant typedefs in the debug output. But if we are returning the
10743 type unchanged, leave it alone so that it's available to
10744 maybe_get_template_decl_from_type_decl. */
10752 type = cp_build_qualified_type_real
10756 /* We might have ignored or rejected some of the qualifiers. */
10763 {
10767 }
10779 {
10781 {
10786 }
10790 }
10793 /* Issue errors about use of storage classes for parameters. */
10795 {
10797 {
10800 }
10802 {
10805 }
10811 /* Function parameters cannot be concept. */
10814 /* Function parameters cannot be constexpr. If we saw one, moan
10815 and pretend it wasn't there. */
10817 {
10820 }
10821 }
10823 /* Give error if `virtual' is used outside of class declaration. */
10826 {
10830 }
10833 {
10848 declspecs->gnu_thread_keyword_p
10854 {
10879 }
10882 {
10884 {
10888 "type must be cv-qualified %<auto%> or reference to "
10890 }
10893 }
10903 }
10905 /* Static anonymous unions are dealt with here. */
10911 /* Warn about storage classes that are invalid for certain
10912 kinds of declarations (parameters, typenames, etc.). */
10914 && ((storage_class
10918 {
10921 }
10926 {
10930 ;
10932 ;
10934 /* C++ allows static class elements. */
10936 /* C++ also allows inlines and signed and unsigned elements,
10937 but in those cases we don't come in here. */
10938 ;
10939 else
10940 {
10943 else
10944 {
10947 else
10949 }
10955 }
10956 }
10961 {
10964 }
10968 {
10973 /* When thread_local is applied to a variable of block scope the
10974 storage-class-specifier static is implied if it does not appear
10975 explicitly. */
10978 }
10981 {
10985 }
10989 else
10990 {
10993 {
11006 }
11007 }
11010 {
11015 }
11017 /* Determine the type of the entity declared by recurring on the
11018 declarator. */
11020 {
11022 tree attrs;
11029 {
11041 attr_flags);
11042 }
11046 /* We don't want to warn in parameter context because we don't
11047 yet know if the parse will succeed, and this might turn out
11048 to be a constructor call. */
11051 && !typedef_p
11053 /* If the type is class-like and the inner name used a
11054 global namespace qualifier, we need the parens.
11055 Unfortunately all we can tell is whether a qualified name
11056 was used or not. */
11057 && !(inner_declarator
11068 {
11076 /* [dcl.array]/1:
11078 The optional attribute-specifier-seq appertains to the
11079 array. */
11085 {
11086 tree arg_types;
11089 /* Declaring a function type. */
11095 /* Pick up type qualifiers which should be applied to `this'. */
11097 /* Pick up virt-specifiers. */
11099 /* And ref-qualifier, too */
11101 /* And tx-qualifier. */
11103 /* Pick up the exception specifications. */
11105 /* If the exception-specification is ill-formed, let's pretend
11106 there wasn't one. */
11114 /* Say it's a definition only for the CALL_EXPR
11115 closest to the identifier. */
11118 /* Handle a late-specified return type. */
11121 {
11123 {
11125 {
11130 {
11132 "%<auto%> type specifier without trailing "
11135 "only available with -std=c++14 or "
11137 }
11139 {
11143 }
11144 }
11146 {
11151 }
11157 {
11159 {
11166 }
11168 {
11170 "for %qT must have trailing return "
11175 }
11181 else
11185 }
11186 }
11189 {
11191 /* Not using maybe_warn_cpp0x because this should
11192 always be an error. */
11195 else
11199 }
11200 }
11206 {
11209 }
11212 {
11216 /* We now know that the TYPE_QUALS don't apply to the
11217 decl, but to its return type. */
11219 }
11221 /* Error about some types functions can't return. */
11224 {
11228 }
11230 {
11234 }
11238 && funcdecl_p
11244 {
11245 /* We are within a class's scope. If our declarator name
11246 is the same as the class name, and we are defining
11247 a function, then it is a constructor/destructor, and
11248 therefore returns a void type. */
11250 /* ISO C++ 12.4/2. A destructor may not be declared
11251 const or volatile. A destructor may not be static.
11252 A destructor may not be declared with ref-qualifier.
11254 ISO C++ 12.1. A constructor may not be declared
11255 const or volatile. A constructor may not be
11256 virtual. A constructor may not be static.
11257 A constructor may not be declared with ref-qualifier. */
11263 {
11268 }
11271 {
11277 }
11281 current_class_type,
11282 flags))
11286 {
11287 /* It's a constructor. */
11291 {
11295 }
11299 }
11302 }
11304 {
11306 {
11307 /* Cannot be both friend and virtual. */
11310 }
11314 {
11318 }
11319 }
11321 {
11323 {
11326 }
11329 }
11331 {
11334 }
11341 pushed_scope
11353 {
11357 }
11363 {
11365 /* transaction_safe applies to the type, but
11366 transaction_safe_dynamic applies to the function. */
11369 else
11371 }
11373 /* [dcl.fct]/2:
11375 The optional attribute-specifier-seq appertains to
11376 the function type. */
11381 }
11387 /* Filter out pointers-to-references and references-to-references.
11388 We can get these if a TYPE_DECL is used. */
11391 {
11393 {
11396 }
11398 /* In C++0x, we allow reference to reference declarations
11399 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
11400 and template type arguments [14.3.1/4 temp.arg.type]. The
11401 check for direct reference to reference declarations, which
11402 are still forbidden, occurs below. Reasoning behind the change
11403 can be found in DR106, DR540, and the rvalue reference
11404 proposals. */
11406 {
11409 }
11410 }
11412 {
11417 }
11419 /* We now know that the TYPE_QUALS don't apply to the decl,
11420 but to the target of the pointer. */
11423 /* This code used to handle METHOD_TYPE, but I don't think it's
11424 possible to get it here anymore. */
11428 {
11432 memfn_quals,
11433 rqual);
11439 }
11447 type);
11449 /* When the pointed-to type involves components of variable size,
11450 care must be taken to ensure that the size evaluation code is
11451 emitted early enough to dominate all the possible later uses
11452 and late enough for the variables on which it depends to have
11453 been assigned.
11455 This is expected to happen automatically when the pointed-to
11456 type has a name/declaration of it's own, but special attention
11457 is required if the type is anonymous.
11459 We handle the NORMAL and FIELD contexts here by inserting a
11460 dummy statement that just evaluates the size at a safe point
11461 and ensures it is not deferred until e.g. within a deeper
11462 conditional context (c++/43555).
11464 We expect nothing to be needed here for PARM or TYPENAME.
11465 Evaluating the size at this point for TYPENAME would
11466 actually be incorrect, as we might be in the middle of an
11467 expression with side effects on the pointed-to type size
11468 "arguments" prior to the pointer declaration point and the
11469 size evaluation could end up prior to the side effects. */
11475 {
11479 }
11482 {
11483 /* In C++0x, the type we are creating a reference to might be
11484 a typedef which is itself a reference type. In that case,
11485 we follow the reference collapsing rules in
11486 [7.1.3/8 dcl.typedef] to create the final reference type:
11488 "If a typedef TD names a type that is a reference to a type
11489 T, an attempt to create the type 'lvalue reference to cv TD'
11490 creates the type 'lvalue reference to T,' while an attempt
11491 to create the type "rvalue reference to cv TD' creates the
11492 type TD."
11493 */
11497 {
11500 else
11502 }
11503 else
11504 type = cp_build_reference_type
11507 /* In C++0x, we need this check for direct reference to
11508 reference declarations, which are forbidden by
11509 [8.3.2/5 dcl.ref]. Reference to reference declarations
11510 are only allowed indirectly through typedefs and template
11511 type arguments. Example:
11513 void foo(int & &); // invalid ref-to-ref decl
11515 typedef int & int_ref;
11516 void foo(int_ref &); // valid ref-to-ref decl
11517 */
11521 }
11525 {
11529 /* We will already have complained. */
11531 else
11533 type);
11534 }
11535 else
11538 /* Process a list of type modifier keywords (such as
11539 const or volatile) that were given inside the `*' or `&'. */
11542 {
11543 type
11547 }
11549 /* Apply C++11 attributes to the pointer, and not to the
11550 type pointed to. This is unlike what is done for GNU
11551 attributes above. It is to comply with [dcl.ptr]/1:
11553 [the optional attribute-specifier-seq (7.6.1) appertains
11554 to the pointer and not to the object pointed to]. */
11567 }
11568 }
11570 /* A `constexpr' specifier used in an object declaration declares
11571 the object as `const'. */
11573 {
11574 /* DR1688 says that a `constexpr' specifier in combination with
11575 `volatile' is valid. */
11578 {
11581 }
11582 }
11588 {
11590 unqualified_id);
11592 }
11594 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
11595 qualified with a class-name, turn it into a METHOD_TYPE, unless
11596 we know that the function is static. We take advantage of this
11597 opportunity to do other processing that pertains to entities
11598 explicitly declared to be class members. Note that if DECLARATOR
11599 is non-NULL, we know it is a cdk_id declarator; otherwise, we
11600 would not have exited the loop above. */
11605 {
11611 {
11613 {
11617 }
11618 else
11622 }
11624 can skip the following checks. */
11627 qualifying type must certainly be complete. */
11628 funcdef_flag
11629 /* A friend declaration of "T::f" is OK, even if
11630 "T" is a template parameter. But, if this
11631 function is not a friend, the qualifying type
11632 must be a class. */
11634 /* For a declaration, the type need not be
11635 complete, if either it is dependent (since there
11636 is no meaningful definition of complete in that
11637 case) or the qualifying class is currently being
11638 defined. */
11641 /* Check that the qualifying type is complete. */
11645 {
11648 {
11656 }
11657 }
11659 {
11663 }
11664 }
11669 /* Now TYPE has the actual type. */
11672 {
11675 else
11677 }
11683 {
11684 /* [dcl.meaning]/1: The optional attribute-specifier-seq following
11685 a declarator-id appertains to the entity that is declared. */
11688 else
11689 /* We should have already diagnosed the issue (c++/78344). */
11691 }
11693 /* Handle parameter packs. */
11695 {
11697 /* Turn the type into a pack expansion.*/
11699 else
11701 }
11704 && !processing_template_decl
11706 {
11709 else
11712 }
11715 {
11716 /* [dcl.fct.spec] (C++11) The explicit specifier shall be used only
11717 in the declaration of a constructor or conversion function within
11718 a class definition. */
11725 else
11727 "only declarations of constructors and conversion operators "
11730 }
11733 {
11735 {
11738 }
11740 {
11743 }
11746 {
11749 }
11751 {
11754 }
11756 {
11759 }
11761 {
11765 }
11766 }
11768 /* If this is declaring a typedef name, return a TYPE_DECL. */
11770 {
11771 tree decl;
11773 /* This declaration:
11775 typedef void f(int) const;
11777 declares a function type which is not a member of any
11778 particular class, but which is cv-qualified; for
11779 example "f S::*" declares a pointer to a const-qualified
11780 member function of S. We record the cv-qualification in the
11781 function type. */
11783 {
11786 /* We have now dealt with these qualifiers. */
11789 }
11792 {
11795 }
11801 {
11804 }
11808 else
11812 {
11816 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
11818 /* The TYPE_DECL is "abstract" because there will be
11819 clones of this constructor/destructor, and there will
11820 be copies of this TYPE_DECL generated in those
11821 clones. The decloning optimization (for space) may
11822 revert this subsequently if it determines that
11823 the clones should share a common implementation. */
11825 }
11830 unqualified_id);
11832 /* If the user declares "typedef struct {...} foo" then the
11833 struct will have an anonymous name. Fill that name in now.
11834 Nothing can refer to it, so nothing needs know about the name
11835 change. */
11837 && unqualified_id
11855 /* Acknowledge that this was written:
11856 `using analias = atype;'. */
11860 }
11862 /* Detect the case of an array type of unspecified size
11863 which came, as such, direct from a typedef name.
11864 We must copy the type, so that the array's domain can be
11865 individually set by the object's initializer. */
11872 /* Detect where we're using a typedef of function type to declare a
11873 function. PARMS will not be set, so we must create it now. */
11876 {
11878 tree args;
11883 {
11889 }
11894 {
11895 /* The qualifiers on the function type become the qualifiers on
11896 the non-static member function. */
11900 }
11901 }
11903 /* If this is a type name (such as, in a cast or sizeof),
11904 compute the type and return it now. */
11907 {
11908 /* Note that here we don't care about type_quals. */
11910 /* Special case: "friend class foo" looks like a TYPENAME context. */
11912 {
11914 {
11917 }
11920 {
11921 /* Don't allow friend declaration without a class-key. */
11928 else
11931 type);
11932 }
11934 /* Only try to do this stuff if we didn't already give up. */
11936 {
11937 /* A friendly class? */
11941 else
11943 type);
11946 }
11947 }
11949 {
11956 /* Core issue #547: need to allow this in template type args.
11957 Allow it in general in C++11 for alias-declarations. */
11961 else
11963 }
11969 }
11973 && ! bitfield
11975 {
11978 }
11981 {
11982 /* Only functions may be declared using an operator-function-id. */
11984 {
11987 }
11992 type);
11993 }
11995 /* We don't check parameter types here because we can emit a better
11996 error message later. */
11998 {
12002 }
12004 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
12005 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
12008 {
12014 {
12017 else
12020 }
12022 /* A parameter declared as an array of T is really a pointer to T.
12023 One declared as a function is really a pointer to a function.
12024 One declared as a member is really a pointer to member. */
12027 {
12028 /* Transfer const-ness of array into that of type pointed to. */
12032 }
12035 }
12040 {
12046 }
12048 {
12052 {
12059 }
12061 {
12064 {
12070 else
12074 }
12076 /* The C99 flexible array extension. */
12079 {
12083 {
12086 }
12087 else
12088 {
12089 /* Array is a flexible member. */
12091 /* Do not warn on flexible array members in system
12096 else
12100 /* Flexible array member has a null domain. */
12102 }
12103 }
12106 {
12107 /* Happens when declaring arrays of sizes which
12108 are error_mark_node, for example. */
12110 }
12112 {
12113 /* Something like struct S { int N::j; }; */
12116 }
12119 {
12121 tree function_context;
12124 {
12125 /* This should never happen in pure C++ (the check
12126 could be an assert). It could happen in
12127 Objective-C++ if someone writes invalid code that
12128 uses a function declaration for an instance
12129 variable or property (instance variables and
12130 properties are parsed as FIELD_DECLs, but they are
12131 part of an Objective-C class, not a C++ class).
12132 That code is invalid and is caught by this
12133 check. */
12135 {
12137 unqualified_id);
12139 }
12141 /* ``A union may [ ... ] not [ have ] virtual functions.''
12142 ARM 9.5 */
12144 {
12146 unqualified_id);
12148 }
12153 {
12157 }
12158 }
12160 /* Check that the name used for a destructor makes sense. */
12162 {
12166 {
12171 }
12174 {
12178 }
12180 {
12183 }
12185 {
12188 }
12189 }
12191 {
12196 }
12199 {
12202 }
12204 {
12207 }
12210 {
12213 {
12219 }
12220 }
12222 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
12234 parms,
12235 unqualified_id,
12236 reqs,
12246 #if 0
12247 /* This clobbers the attrs stored in `decl' from `attrlist'. */
12248 /* The decl and setting of decl_attr is also turned off. */
12250 #endif
12252 /* [class.conv.ctor]
12254 A constructor declared without the function-specifier
12255 explicit that can be called with a single parameter
12256 specifies a conversion from the type of its first
12257 parameter to the type of its class. Such a constructor
12258 is called a converting constructor. */
12261 }
12266 {
12269 {
12271 {
12275 }
12276 else
12281 }
12282 }
12283 else
12284 {
12286 {
12290 }
12292 }
12295 {
12296 /* Friends are treated specially. */
12300 {
12302 {
12303 decl = check_explicit_specialization
12308 }
12312 funcdef_flag);
12314 }
12315 else
12317 }
12319 /* Structure field. It may not be a function, except for C++. */
12322 {
12324 {
12325 /* C++ allows static class members. All other work
12326 for this is done by grokfield. */
12334 unqualified_id);
12336 {
12340 }
12347 /* Even if there is an in-class initialization, DECL
12348 is considered undefined until an out-of-class
12349 definition is provided, unless this is an inline
12350 variable. */
12354 {
12360 }
12361 }
12362 else
12363 {
12366 unqualified_id);
12368 {
12370 unqualified_id);
12372 }
12377 {
12380 }
12383 {
12386 }
12389 {
12390 /* An attempt is being made to initialize a non-static
12391 member. This is new in C++11. */
12394 /* If this has been parsed with static storage class, but
12395 errors forced staticp to be cleared, ensure NSDMI is
12396 not present. */
12399 }
12400 }
12406 }
12407 }
12410 {
12411 tree original_name;
12419 else
12421 // FIXME:gcc_assert (original_name == dname);
12428 {
12431 name);
12432 else
12434 name);
12435 }
12439 /* Function declaration not at top level.
12440 Storage classes other than `extern' are not allowed
12441 and `extern' makes no difference. */
12446 {
12449 "%<static%> specifier invalid for function %qs "
12451 else
12453 "%<inline%> specifier invalid for function %qs "
12455 }
12458 {
12460 {
12463 }
12466 {
12471 }
12472 }
12474 /* Record whether the function is public. */
12484 publicp,
12487 sfk,
12488 funcdef_flag,
12497 {
12500 /* Don't allow a static member function in a class, and forbid
12501 declaring main to be static. */
12503 {
12507 }
12509 {
12510 /* 7.1.1: There can be no static function declarations within a
12511 block. */
12514 }
12517 {
12520 }
12521 }
12522 }
12523 else
12524 {
12525 /* It's a variable. */
12527 /* An uninitialized decl with `extern' is a reference. */
12529 declspecs,
12530 initialized,
12531 type_quals,
12532 inlinep,
12533 concept_p,
12534 template_count,
12544 {
12547 {
12552 }
12554 {
12557 }
12559 {
12561 "cannot explicitly declare member %q#D to have "
12564 }
12565 }
12567 {
12571 }
12576 {
12581 }
12582 }
12587 {
12591 }
12594 {
12596 {
12597 /* It's common practice (and completely valid) to have a const
12598 be initialized and declared extern. */
12601 }
12602 else
12603 {
12606 }
12607 }
12609 /* Record `register' declaration for warnings on &
12610 and in case doing stupid register allocation. */
12613 {
12615 /* Warn about register storage specifiers on PARM_DECLs. */
12617 {
12620 "ISO C++17 does not allow %<register%> storage "
12622 else
12625 }
12626 }
12632 /* Set constexpr flag on vars (functions got it in grokfndecl). */
12636 /* Record constancy and volatility on the DECL itself . There's
12637 no need to do this when processing a template; we'll do this
12638 for the instantiated declaration based on the type of DECL. */
12643 }
12644 }
12645 \f
12646 /* Subroutine of start_function. Ensure that each of the parameter
12647 types (as listed in PARMS) is complete, as is required for a
12648 function definition. */
12650 static void
12652 {
12654 {
12659 {
12665 }
12666 else
12667 /* grokparms or complete_type_or_else will have already issued
12668 an error. */
12670 }
12671 }
12673 /* Returns nonzero if T is a local variable. */
12675 int
12677 {
12679 /* A VAR_DECL with a context that is a _TYPE is a static data
12680 member. */
12682 /* Any other non-local variable must be at namespace scope. */
12688 }
12690 /* Like local_variable_p, but suitable for use as a tree-walking
12691 function. */
12693 static tree
12696 {
12704 }
12706 /* Check that ARG, which is a default-argument expression for a
12707 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
12708 something goes wrong. DECL may also be a _TYPE node, rather than a
12709 DECL, if there is no DECL available. */
12711 tree
12713 {
12714 tree var;
12715 tree decl_type;
12718 /* We get a DEFAULT_ARG when looking at an in-class declaration
12719 with a default argument. Ignore the argument for now; we'll
12720 deal with it after the class is complete. */
12724 {
12727 }
12728 else
12735 /* Something already went wrong. There's no need to check
12736 further. */
12739 /* [dcl.fct.default]
12741 A default argument expression is implicitly converted to the
12742 parameter type. */
12744 /* Avoid digest_init clobbering the initializer. */
12747 LOOKUP_IMPLICIT);
12750 /* Avoid redundant -Wzero-as-null-pointer-constant warnings at
12751 the call sites. */
12756 /* [dcl.fct.default]
12758 Local variables shall not be used in default argument
12759 expressions.
12761 The keyword `this' shall not be used in a default argument of a
12762 member function. */
12765 {
12767 {
12771 else
12773 }
12775 }
12777 /* All is well. */
12779 }
12781 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
12783 static tree
12785 {
12790 {
12793 else
12795 }
12797 /* Do warn about using typedefs to a deprecated class. */
12809 return type_is_deprecated
12813 }
12815 /* Decode the list of parameter types for a function type.
12816 Given the list of things declared inside the parens,
12817 return a list of types.
12819 If this parameter does not end with an ellipsis, we append
12820 void_list_node.
12822 *PARMS is set to the chain of PARM_DECLs created. */
12824 tree
12826 {
12829 tree parm;
12833 {
12846 {
12848 && !init
12851 /* DR 577: A parameter list consisting of a single
12852 unnamed parameter of non-dependent type 'void'. */
12856 "invalid use of cv-qualified type %qT in "
12858 else
12860 "invalid use of type %<void%> in parameter "
12862 /* It's not a good idea to actually create parameters of
12863 type `void'; other parts of the compiler assume that a
12864 void type terminates the parameter list. */
12867 }
12870 {
12872 {
12876 }
12878 /* Top-level qualifiers on the parameters are
12879 ignored for function types. */
12882 {
12886 }
12890 {
12891 /* Before C++17 DR 393:
12892 [dcl.fct]/6, parameter types cannot contain pointers
12893 (references) to arrays of unknown bound. */
12898 {
12906 }
12909 ptr
12915 }
12921 }
12926 }
12934 }
12936 \f
12937 /* D is a constructor or overloaded `operator='.
12939 Let T be the class in which D is declared. Then, this function
12940 returns:
12942 -1 if D's is an ill-formed constructor or copy assignment operator
12943 whose first parameter is of type `T'.
12944 0 if D is not a copy constructor or copy assignment
12945 operator.
12946 1 if D is a copy constructor or copy assignment operator whose
12947 first parameter is a reference to non-const qualified T.
12948 2 if D is a copy constructor or copy assignment operator whose
12949 first parameter is a reference to const qualified T.
12951 This function can be used as a predicate. Positive values indicate
12952 a copy constructor and nonzero values indicate a copy assignment
12953 operator. */
12955 int
12957 {
12958 tree args;
12959 tree arg_type;
12967 /* Instantiations of template member functions are never copy
12968 functions. Note that member functions of templated classes are
12969 represented as template functions internally, and we must
12970 accept those as copy functions. */
12982 {
12983 /* Pass by value copy assignment operator. */
12985 }
12989 {
12992 }
12993 else
12999 /* There are more non-optional args. */
13003 }
13005 /* D is a constructor or overloaded `operator='.
13007 Let T be the class in which D is declared. Then, this function
13008 returns true when D is a move constructor or move assignment
13009 operator, false otherwise. */
13011 bool
13013 {
13017 /* There are no move constructors if we are in C++98 mode. */
13023 /* Instantiations of template member functions are never move
13024 functions. Note that member functions of templated classes are
13025 represented as template functions internally, and we must
13026 accept those as move functions. */
13030 }
13032 /* D is a constructor or overloaded `operator='.
13034 Then, this function returns true when D has the same signature as a move
13035 constructor or move assignment operator (because either it is such a
13036 ctor/op= or it is a template specialization with the same signature),
13037 false otherwise. */
13039 bool
13041 {
13042 tree args;
13043 tree arg_type;
13063 /* There are more non-optional args. */
13067 }
13069 /* Remember any special properties of member function DECL. */
13071 void
13073 {
13074 tree class_type;
13081 {
13088 {
13089 /* [class.copy]
13091 A non-template constructor for class X is a copy
13092 constructor if its first parameter is of type X&, const
13093 X&, volatile X& or const volatile X&, and either there
13094 are no other parameters or else all other parameters have
13095 default arguments. */
13101 }
13112 }
13114 {
13115 /* [class.copy]
13117 A non-template assignment operator for class X is a copy
13118 assignment operator if its parameter is of type X, X&, const
13119 X&, volatile X& or const volatile X&. */
13124 {
13130 }
13133 }
13137 /* Destructors are handled in check_methods. */
13138 }
13140 /* Check a constructor DECL has the correct form. Complains
13141 if the class has a constructor of the form X(X). */
13143 bool
13145 {
13149 {
13150 /* [class.copy]
13152 A declaration of a constructor for a class X is ill-formed if
13153 its first parameter is of type (optionally cv-qualified) X
13154 and either there are no other parameters or else all other
13155 parameters have default arguments.
13157 We *don't* complain about member template instantiations that
13158 have this form, though; they can occur as we try to decide
13159 what constructor to use during overload resolution. Since
13160 overload resolution will never prefer such a constructor to
13161 the non-template copy constructor (which is either explicitly
13162 or implicitly defined), there's no need to worry about their
13163 existence. Theoretically, they should never even be
13164 instantiated, but that's hard to forestall. */
13168 }
13171 }
13173 /* DECL is a declaration for an overloaded or conversion operator. If
13174 COMPLAIN is true, errors are issued for invalid declarations. */
13176 bool
13178 {
13187 tree_code operator_code;
13190 {
13191 /* Conversion operators are TYPE_EXPR for the purposes of this
13192 function. */
13195 }
13196 else
13197 {
13204 }
13207 {
13208 /* operator new and operator delete are quite special. */
13211 {
13230 }
13232 /* [basic.std.dynamic.allocation]/1:
13234 A program is ill-formed if an allocation function is declared
13235 in a namespace scope other than global scope or declared
13236 static in global scope.
13238 The same also holds true for deallocation functions. */
13240 {
13242 {
13245 }
13248 {
13251 }
13252 }
13256 else
13257 {
13260 }
13263 }
13265 /* An operator function must either be a non-static member function
13266 or have at least one parameter of a class, a reference to a class,
13267 an enumeration, or a reference to an enumeration. 13.4.0.6 */
13269 {
13275 {
13278 }
13281 {
13285 }
13288 {
13290 {
13295 }
13301 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
13302 because these checks are performed even on template
13303 functions. */
13307 }
13308 }
13311 /* There are no further restrictions on the arguments to an overloaded
13312 "operator ()". */
13316 {
13317 /* 13.4.0.3 */
13320 }
13322 /* Count the number of arguments and check for ellipsis. */
13325 {
13327 {
13328 /* Variadic. */
13331 }
13333 }
13335 /* Verify correct number of arguments. */
13337 {
13340 {
13341 /* We have a unary instance of an ambi-ary op. Remap to the
13342 unary one. */
13348 }
13350 {
13351 /* This was an ambiguous operator but is invalid. */
13356 }
13359 && ! processing_template_decl
13360 /* x++ and x--'s second argument must be an int. */
13362 integer_type_node))
13363 {
13367 decl);
13369 }
13374 {
13379 }
13384 {
13389 }
13394 }
13396 /* There can be no default arguments. */
13399 {
13405 else
13406 {
13409 }
13410 }
13412 /* At this point the declaration is well-formed. It may not be
13413 sensible though. */
13415 /* Check member function warnings only on the in-class declaration.
13416 There's no point warning on an out-of-class definition. */
13420 /* Warn about conversion operators that will never be used. */
13424 {
13433 ref
13439 {
13442 ref
13447 /* Don't force t to be complete here. */
13452 ref
13457 }
13458 }
13463 /* Effective C++ rules below. */
13465 /* More Effective C++ rule 7. */
13472 /* More Effective C++ rule 6. */
13477 {
13486 {
13491 }
13492 else
13493 {
13496 }
13497 }
13499 /* Effective C++ rule 23. */
13510 }
13511 \f
13512 /* Return a string giving the keyword associate with CODE. */
13516 {
13518 {
13531 }
13532 }
13534 /* Name lookup in an elaborated-type-specifier (after the keyword
13535 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
13536 elaborated-type-specifier is invalid, issue a diagnostic and return
13537 error_mark_node; otherwise, return the *_TYPE to which it referred.
13538 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
13540 tree
13542 tree decl,
13544 {
13545 tree type;
13547 /* In the case of:
13549 struct S { struct S *p; };
13551 name lookup will find the TYPE_DECL for the implicit "S::S"
13552 typedef. Adjust for that here. */
13558 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
13559 is false for this case as well. */
13561 {
13565 }
13566 /* Accept template template parameters. */
13570 ;
13571 /* [dcl.type.elab]
13573 If the identifier resolves to a typedef-name or the
13574 simple-template-id resolves to an alias template
13575 specialization, the elaborated-type-specifier is ill-formed.
13577 In other words, the only legitimate declaration to use in the
13578 elaborated type specifier is the implicit typedef created when
13579 the type is declared. */
13583 {
13587 else
13592 }
13597 {
13601 }
13604 {
13608 }
13612 {
13613 /* If a class template appears as elaborated type specifier
13614 without a template header such as:
13616 template <class T> class C {};
13617 void f(class C); // No template header here
13619 then the required template argument is missing. */
13624 }
13627 }
13629 /* Lookup NAME in elaborate type specifier in scope according to
13630 SCOPE and issue diagnostics if necessary.
13631 Return *_TYPE node upon success, NULL_TREE when the NAME is not
13632 found, and ERROR_MARK_NODE for type error. */
13634 static tree
13637 {
13638 tree t;
13639 tree decl;
13641 {
13642 /* First try ordinary name lookup, ignoring hidden class name
13643 injected via friend declaration. */
13646 /* If that fails, the name will be placed in the smallest
13647 non-class, non-function-prototype scope according to 3.3.1/5.
13648 We may already have a hidden name declared as friend in this
13649 scope. So lookup again but not ignoring hidden names.
13650 If we find one, that name will be made visible rather than
13651 creating a new tag. */
13654 }
13655 else
13660 /* If scope is ts_current we're defining a class, so ignore a
13661 template template parameter. */
13667 {
13668 /* Look for invalid nested type:
13669 class C {
13670 class C {};
13671 }; */
13673 {
13676 decl);
13678 }
13680 /* Two cases we need to consider when deciding if a class
13681 template is allowed as an elaborated type specifier:
13682 1. It is a self reference to its own class.
13683 2. It comes with a template header.
13685 For example:
13687 template <class T> class C {
13688 class C *c1; // DECL_SELF_REFERENCE_P is true
13689 class D;
13690 };
13691 template <class U> class C; // template_header_p is true
13692 template <class T> class C<T>::D {
13693 class C *c2; // DECL_SELF_REFERENCE_P is true
13694 }; */
13697 decl,
13698 template_header_p
13703 {
13712 }
13715 }
13717 {
13721 }
13722 else
13724 }
13726 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
13727 Define the tag as a forward-reference if it is not defined.
13729 If a declaration is given, process it here, and report an error if
13730 multiple declarations are not identical.
13732 SCOPE is TS_CURRENT when this is also a definition. Only look in
13733 the current frame for the name (since C++ allows new names in any
13734 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
13735 declaration. Only look beginning from the current scope outward up
13736 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
13738 TEMPLATE_HEADER_P is true when this declaration is preceded by
13739 a set of template parameters. */
13741 static tree
13744 {
13751 {
13764 }
13766 /* In case of anonymous name, xref_tag is only called to
13767 make type node and push name. Name lookup is not required. */
13778 {
13782 /* Since SCOPE is not TS_CURRENT, we are not looking at a
13783 definition of this tag. Since, in addition, we are currently
13784 processing a (member) template declaration of a template
13785 class, we must be very careful; consider:
13787 template <class X> struct S1
13789 template <class U> struct S2
13790 {
13791 template <class V> friend struct S1;
13792 };
13794 Here, the S2::S1 declaration should not be confused with the
13795 outer declaration. In particular, the inner version should
13796 have a template parameter of level 2, not level 1.
13798 On the other hand, when presented with:
13800 template <class T> struct S1
13801 {
13802 template <class U> struct S2 {};
13803 template <class U> friend struct S2;
13804 };
13806 the friend must find S1::S2 eventually. We accomplish this
13807 by making sure that the new type we create to represent this
13808 declaration has the right TYPE_CONTEXT. */
13811 }
13814 {
13815 /* If no such tag is yet defined, create a forward-reference node
13816 and record it as the "definition".
13817 When a real declaration of this type is found,
13818 the forward-reference will be altered into a real type. */
13820 {
13823 }
13824 else
13825 {
13829 {
13830 /* Mark it as a lambda type. */
13832 /* And push it into current scope. */
13834 }
13836 }
13837 }
13838 else
13839 {
13841 {
13842 /* Check that we aren't trying to overload a class with different
13843 constraints. */
13846 {
13849 }
13852 }
13856 {
13860 }
13863 {
13864 /* This is no longer an invisible friend. Make it
13865 visible. */
13872 {
13876 }
13877 }
13878 }
13881 }
13883 /* Wrapper for xref_tag_1. */
13885 tree
13888 {
13889 tree ret;
13895 }
13898 tree
13900 {
13905 else
13912 }
13914 /* Create the binfo hierarchy for REF with (possibly NULL) base list
13915 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
13916 access_* node, and the TREE_VALUE is the type of the base-class.
13917 Non-NULL TREE_TYPE indicates virtual inheritance. */
13919 void
13921 {
13928 tree default_access;
13934 /* The base of a derived class is private by default, all others are
13935 public. */
13940 /* First, make sure that any templates in base-classes are
13941 instantiated. This ensures that if we call ourselves recursively
13942 we do not get confused about which classes are marked and which
13943 are not. */
13946 {
13949 /* The dependent_type_p call below should really be dependent_scope_p
13950 so that we give a hard error about using an incomplete type as a
13951 base, but we allow it with a pedwarn for backward
13952 compatibility. */
13958 /* An incomplete type. Remove it from the list. */
13960 else
13961 {
13962 max_bases++;
13964 max_dvbases++;
13968 }
13969 }
13974 /* The binfo slot should be empty, unless this is an (ill-formed)
13975 redefinition. */
13986 /* Apply base-class info set up to the variants of this type. */
13990 {
13992 /* A C++98 POD cannot have base classes. */
13996 {
13999 }
14000 }
14007 {
14008 /* An aggregate can't have virtual base classes. */
14016 }
14019 {
14027 /* Before C++17, an aggregate cannot have base classes. In C++17, an
14028 aggregate can't have virtual, private, or protected base classes. */
14039 {
14041 basetype);
14043 }
14047 {
14049 /* The original basetype could have been a typedef'd type. */
14052 /* Inherit flags from the base. */
14063 }
14065 /* We must do this test after we've seen through a typedef
14066 type. */
14068 {
14071 else
14074 }
14077 /* Regenerate the pack expansion for the bases. */
14091 dropped_base:
14092 /* Update max_vbases to reflect the reality that we are dropping
14093 this base: if it reaches zero we want to undo the vec_alloc
14094 above to avoid inconsistencies during error-recovery: eg, in
14095 build_special_member_call, CLASSTYPE_VBASECLASSES non null
14096 and vtt null (c++/27952). */
14098 max_vbases--;
14100 max_vbases
14102 }
14109 /* If we didn't get max_vbases vbases, we must have shared at
14110 least one of them, and are therefore diamond shaped. */
14113 /* Unmark all the types. */
14118 /* Now see if we have a repeated base type. */
14120 {
14123 {
14125 {
14128 }
14130 }
14135 else
14137 }
14138 }
14140 \f
14141 /* Copies the enum-related properties from type SRC to type DST.
14142 Used with the underlying type of an enum and the enum itself. */
14143 static void
14145 {
14146 tree t;
14148 {
14158 else
14162 }
14163 }
14165 /* Begin compiling the definition of an enumeration type.
14166 NAME is its name,
14168 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
14170 UNDERLYING_TYPE is the type that will be used as the storage for
14171 the enumeration type. This should be NULL_TREE if no storage type
14172 was specified.
14174 ATTRIBUTES are any attributes specified after the enum-key.
14176 SCOPED_ENUM_P is true if this is a scoped enumeration type.
14178 if IS_NEW is not NULL, gets TRUE iff a new type is created.
14180 Returns the type object, as yet incomplete.
14181 Also records info about it so that build_enumerator
14182 may be used to declare the individual values as they are read. */
14184 tree
14187 {
14193 /* [C++0x dcl.enum]p5:
14195 If not explicitly specified, the underlying type of a scoped
14196 enumeration type is int. */
14203 /* If this is the real definition for a previous forward reference,
14204 fill in the contents in the same object that used to be the
14205 forward reference. */
14211 /* In case of a template_decl, the only check that should be deferred
14212 to instantiation time is the comparison of underlying types. */
14214 {
14216 {
14222 }
14224 {
14230 }
14236 {
14242 }
14243 }
14247 {
14248 /* In case of error, make a dummy enum to allow parsing to
14249 continue. */
14251 {
14254 }
14256 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
14257 of an opaque enum, or an opaque enum of an already defined
14258 enumeration (C++0x only).
14259 In any other case, it'll be NULL_TREE. */
14261 {
14264 }
14267 /* Do not push the decl more than once, unless we need to
14268 compare underlying types at instantiation time */
14271 || (underlying_type
14275 {
14279 /* std::byte aliases anything. */
14284 }
14285 else
14292 /* The enum is considered opaque until the opening '{' of the
14293 enumerator list. */
14296 }
14303 {
14305 /* We already checked that it matches, don't change it to a different
14308 {
14311 }
14314 else
14317 }
14319 /* If into a template class, the returned enum is always the first
14320 declaration (opaque or not) seen. This way all the references to
14321 this type will be to the same declaration. The following ones are used
14322 only to check for definition errors. */
14325 else
14327 }
14329 /* After processing and defining all the values of an enumeration type,
14330 install their decls in the enumeration type.
14331 ENUMTYPE is the type object. */
14333 void
14335 {
14336 tree values;
14337 tree underlying_type;
14338 tree decl;
14339 tree value;
14341 tree t;
14343 bool fixed_underlying_type_p
14346 /* We built up the VALUES in reverse order. */
14349 /* For an enum defined in a template, just set the type of the values;
14350 all further processing is postponed until the template is
14351 instantiated. We need to set the type so that tsubst of a CONST_DECL
14352 works. */
14354 {
14356 values;
14360 }
14362 /* Determine the minimum and maximum values of the enumerators. */
14364 {
14368 values;
14370 {
14373 /* [dcl.enum]: Following the closing brace of an enum-specifier,
14374 each enumerator has the type of its enumeration. Prior to the
14375 closing brace, the type of each enumerator is the type of its
14376 initializing value. */
14379 /* Update the minimum and maximum values, if appropriate. */
14383 /* Figure out what the minimum and maximum values of the
14384 enumerators are. */
14391 }
14392 }
14393 else
14394 /* [dcl.enum]
14396 If the enumerator-list is empty, the underlying type is as if
14397 the enumeration had a single enumerator with value 0. */
14401 {
14402 /* Compute the number of bits require to represent all values of the
14403 enumeration. We must do this before the type of MINNODE and
14404 MAXNODE are transformed, since tree_int_cst_min_precision relies
14405 on the TREE_TYPE of the value it is passed. */
14413 /* Determine the underlying type of the enumeration.
14415 [dcl.enum]
14417 The underlying type of an enumeration is an integral type that
14418 can represent all the enumerator values defined in the
14419 enumeration. It is implementation-defined which integral type is
14420 used as the underlying type for an enumeration except that the
14421 underlying type shall not be larger than int unless the value of
14422 an enumerator cannot fit in an int or unsigned int.
14424 We use "int" or an "unsigned int" as the underlying type, even if
14425 a smaller integral type would work, unless the user has
14426 explicitly requested that we use the smallest possible type. The
14427 user can request that for all enumerations with a command line
14428 flag, or for just one enumeration with an attribute. */
14430 use_short_enum = flag_short_enums
14433 /* If the precision of the type was specified with an attribute and it
14434 was too small, give an error. Otherwise, use it. */
14436 {
14439 else
14440 {
14443 }
14444 }
14448 itk++)
14449 {
14455 }
14457 {
14458 /* DR 377
14460 IF no integral type can represent all the enumerator values, the
14461 enumeration is ill-formed. */
14466 }
14468 /* [dcl.enum]
14470 The value of sizeof() applied to an enumeration type, an object
14471 of an enumeration type, or an enumerator, is the value of sizeof()
14472 applied to the underlying type. */
14475 /* Compute the minimum and maximum values for the type.
14477 [dcl.enum]
14479 For an enumeration where emin is the smallest enumerator and emax
14480 is the largest, the values of the enumeration are the values of the
14481 underlying type in the range bmin to bmax, where bmin and bmax are,
14482 respectively, the smallest and largest values of the smallest bit-
14483 field that can store emin and emax. */
14485 /* The middle-end currently assumes that types with TYPE_PRECISION
14486 narrower than their underlying type are suitably zero or sign
14487 extended to fill their mode. Similarly, it assumes that the front
14488 end assures that a value of a particular type must be within
14489 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
14491 We used to set these fields based on bmin and bmax, but that led
14492 to invalid assumptions like optimizing away bounds checking. So
14493 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
14494 TYPE_MAX_VALUE to the values for the mode above and only restrict
14495 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
14499 set_min_and_max_values_for_integral_type
14502 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
14505 }
14506 else
14509 /* Convert each of the enumerators to the type of the underlying
14510 type of the enumeration. */
14512 {
14513 location_t saved_location;
14519 /* If the enumeration type has a fixed underlying type, we
14520 already checked all of the enumerator values. */
14522 else
14525 tf_warning_or_error);
14528 /* Do not clobber shared ints. */
14530 {
14534 }
14536 }
14538 /* Fix up all variant types of this enum type. */
14545 {
14547 /* TYPE_FIELDS needs fixup. */
14549 }
14551 /* Finish debugging output for this type. */
14554 /* Each enumerator now has the type of its enumeration. Clear the cache
14555 so that this change in types doesn't confuse us later on. */
14557 }
14559 /* Finishes the enum type. This is called only the first time an
14560 enumeration is seen, be it opaque or odinary.
14561 ENUMTYPE is the type object. */
14563 void
14565 {
14567 {
14571 }
14573 /* If this is a forward declaration, there should not be any variants,
14574 though we can get a variant in the middle of an enum-specifier with
14575 wacky code like 'enum E { e = sizeof(const E*) };' */
14579 }
14581 /* Build and install a CONST_DECL for an enumeration constant of the
14582 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
14583 Apply ATTRIBUTES if available. LOC is the location of NAME.
14584 Assignment of sequential values by default is handled here. */
14586 void
14588 location_t loc)
14589 {
14590 tree decl;
14591 tree context;
14592 tree type;
14594 /* scalar_constant_value will pull out this expression, so make sure
14595 it's folded as appropriate. */
14599 /* If the VALUE was erroneous, pretend it wasn't there; that will
14600 result in the enum being assigned the next value in sequence. */
14604 /* Remove no-op casts from the value. */
14609 {
14610 /* Validate and default VALUE. */
14612 {
14614 {
14619 }
14622 value = perform_implicit_conversion_flags
14630 {
14633 {
14637 }
14638 else
14639 {
14643 {
14647 }
14648 }
14649 }
14650 }
14652 /* Default based on previous value. */
14654 {
14656 {
14657 tree prev_value;
14660 /* C++03 7.2/4: If no initializer is specified for the first
14661 enumerator, the type is an unspecified integral
14662 type. Otherwise the type is the same as the type of the
14663 initializing value of the preceding enumerator unless the
14664 incremented value is not representable in that type, in
14665 which case the type is an unspecified integral type
14666 sufficient to contain the incremented value. */
14670 else
14671 {
14677 {
14680 {
14683 {
14689 }
14696 }
14699 else
14701 }
14704 {
14707 }
14708 }
14709 }
14710 else
14712 }
14714 /* Remove no-op casts from the value. */
14717 /* If the underlying type of the enum is fixed, check whether
14718 the enumerator values fits in the underlying type. If it
14719 does not fit, the program is ill-formed [C++0x dcl.enum]. */
14721 && value
14723 {
14728 /* Convert the value to the appropriate type. */
14730 }
14731 }
14733 /* C++ associates enums with global, function, or class declarations. */
14736 /* Build the actual enumeration constant. Note that the enumeration
14737 constants have the underlying type of the enum (if it is fixed)
14738 or the type of their initializer (if the underlying type of the
14739 enum is not fixed):
14741 [ C++0x dcl.enum ]
14743 If the underlying type is fixed, the type of each enumerator
14744 prior to the closing brace is the underlying type; if the
14745 initializing value of an enumerator cannot be represented by
14746 the underlying type, the program is ill-formed. If the
14747 underlying type is not fixed, the type of each enumerator is
14748 the type of its initializing value.
14750 If the underlying type is not fixed, it will be computed by
14751 finish_enum and we will reset the type of this enumerator. Of
14752 course, if we're processing a template, there may be no value. */
14766 {
14767 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
14768 on the TYPE_FIELDS list for `S'. (That's so that you can say
14769 things like `S::i' later.) */
14771 /* The enumerator may be getting declared outside of its enclosing
14772 class, like so:
14774 class S { public: enum E : int; }; enum S::E : int { i = 7; };
14776 For which case we need to make sure that the access of `S::i'
14777 matches the access of `S::E'. */
14783 else
14789 }
14790 else
14793 /* Add this enumeration constant to the list for this type. */
14795 }
14797 /* Look for an enumerator with the given NAME within the enumeration
14798 type ENUMTYPE. This routine is used primarily for qualified name
14799 lookup into an enumerator in C++0x, e.g.,
14801 enum class Color { Red, Green, Blue };
14803 Color color = Color::Red;
14805 Returns the value corresponding to the enumerator, or
14806 NULL_TREE if no such enumerator was found. */
14807 tree
14809 {
14810 tree e;
14815 }
14817 \f
14818 /* We're defining DECL. Make sure that its type is OK. */
14820 static void
14822 {
14826 /* In a function definition, arg types must be complete. */
14833 {
14838 /* Make it return void instead. */
14841 void_type_node,
14843 else
14845 fntype
14848 fntype = (cp_build_type_attribute_variant
14851 }
14852 else
14853 {
14857 }
14858 }
14860 /* True iff FN is an implicitly-defined default constructor. */
14862 static bool
14864 {
14868 }
14870 /* Clobber the contents of *this to let the back end know that the object
14871 storage is dead when we enter the constructor or leave the destructor. */
14873 static tree
14875 {
14876 /* Clobbering an empty base is pointless, and harmful if its one byte
14877 TYPE_SIZE overlays real data. */
14881 /* If we have virtual bases, clobber the whole object, but only if we're in
14882 charge. If we don't have virtual bases, clobber the as-base type so we
14883 don't mess with tail padding. */
14894 {
14897 }
14904 }
14906 /* Create the FUNCTION_DECL for a function definition.
14907 DECLSPECS and DECLARATOR are the parts of the declaration;
14908 they describe the function's name and the type it returns,
14909 but twisted together in a fashion that parallels the syntax of C.
14911 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
14912 DECLARATOR is really the DECL for the function we are about to
14913 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
14914 indicating that the function is an inline defined in-class.
14916 This function creates a binding context for the function body
14917 as well as setting up the FUNCTION_DECL in current_function_decl.
14919 For C++, we must first check whether that datum makes any sense.
14920 For example, "class A local_a(1,2);" means that variable local_a
14921 is an aggregate of type A, which should have a constructor
14922 applied to it with the argument list [1, 2].
14924 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
14925 or may be a BLOCK if the function has been defined previously
14926 in this translation unit. On exit, DECL_INITIAL (decl1) will be
14927 error_mark_node if the function has never been defined, or
14928 a BLOCK if the function has been defined somewhere. */
14930 bool
14932 {
14934 tree fntype;
14935 tree restype;
14938 tree current_function_parms;
14943 /* Sanity check. */
14951 /* ISO C++ 11.4/5. A friend function defined in a class is in
14952 the (lexical) scope of the class in which it is defined. */
14954 {
14957 /* CTYPE could be null here if we're dealing with a template;
14958 for example, `inline friend float foo()' inside a template
14959 will have no CTYPE set. */
14962 else
14964 }
14971 /* Handle gnu_inline attribute. */
14973 {
14978 }
14981 /* This is a constructor, we must ensure that any default args
14982 introduced by this definition are propagated to the clones
14983 now. The clones are used directly in overload resolution. */
14986 /* Sometimes we don't notice that a function is a static member, and
14987 build a METHOD_TYPE for it. Fix that up now. */
14991 /* Set up current_class_type, and enter the scope of the class, if
14992 appropriate. */
14998 /* Now that we have entered the scope of the class, we must restore
14999 the bindings for any template parameters surrounding DECL1, if it
15000 is an inline member template. (Order is important; consider the
15001 case where a template parameter has the same name as a field of
15002 the class.) It is not until after this point that
15003 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
15007 /* Effective C++ rule 15. */
15015 /* Make the init_value nonzero so pushdecl knows this is not tentative.
15016 error_mark_node is replaced below (in poplevel) with the BLOCK. */
15020 /* This function exists in static storage.
15021 (This does not mean `static' in the C sense!) */
15024 /* We must call push_template_decl after current_class_type is set
15025 up. (If we are processing inline definitions after exiting a
15026 class scope, current_class_type will be NULL_TREE until set above
15027 by push_nested_class.) */
15029 {
15032 {
15036 }
15038 }
15040 /* Make sure the parameter and return types are reasonable. When
15041 you declare a function, these types can be incomplete, but they
15042 must be complete when you define the function. */
15045 /* Build the return declaration for the function. */
15049 {
15050 tree resdecl;
15058 }
15060 /* Record the decl so that the function name is defined.
15061 If we already have a decl for this name, and it is a FUNCTION_DECL,
15062 use the old decl. */
15064 {
15065 /* A specialization is not used to guide overload resolution. */
15069 {
15073 /* If something went wrong when registering the declaration,
15074 use DECL1; we have to have a FUNCTION_DECL to use when
15075 parsing the body of the function. */
15076 ;
15077 else
15078 {
15079 /* Otherwise, OLDDECL is either a previous declaration
15080 of the same function or DECL1 itself. */
15087 {
15088 tree context;
15090 /* Check whether DECL1 is in an anonymous
15091 namespace. */
15093 context;
15095 {
15099 }
15103 OPT_Wmissing_declarations,
15105 }
15108 }
15109 }
15110 else
15111 {
15112 /* We need to set the DECL_CONTEXT. */
15115 }
15119 /* If #pragma weak applies, mark the decl appropriately now.
15120 The pragma only applies to global functions. Because
15121 determining whether or not the #pragma applies involves
15122 computing the mangled name for the declaration, we cannot
15123 apply the pragma until after we have merged this declaration
15124 with any previous declarations; if the original declaration
15125 has a linkage specification, that specification applies to
15126 the definition as well, and may affect the mangled name. */
15129 }
15131 /* We are now in the scope of the function being defined. */
15134 /* Save the parm names or decls from this function's declarator
15135 where store_parm_decls will find them. */
15138 /* Let the user know we're compiling this function. */
15143 /* This function may already have been parsed, in which case just
15144 return; our caller will skip over the body without parsing. */
15148 /* Initialize RTL machinery. We cannot do this until
15149 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
15150 even when processing a template; this is how we get
15151 CFUN set up, and our per-function variables initialized.
15152 FIXME factor out the non-RTL stuff. */
15156 /* Initialize the language data structures. Whenever we start
15157 a new function, we destroy temporaries in the usual way. */
15163 {
15166 }
15168 /* Start the statement-tree, start the tree now. */
15171 /* If we are (erroneously) defining a function that we have already
15172 defined before, wipe out what we knew before. */
15177 {
15178 /* We know that this was set up by `grokclassfn'. We do not
15179 wait until `store_parm_decls', since evil parse errors may
15180 never get us to that point. Here we keep the consistency
15181 between `current_class_type' and `current_class_ptr'. */
15187 cp_function_chain->x_current_class_ref
15189 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
15192 /* Constructors and destructors need to know whether they're "in
15193 charge" of initializing virtual base classes. */
15196 {
15199 }
15201 {
15204 }
15205 }
15208 /* Implicitly-defined methods (like the
15209 destructor for a class in which no destructor
15210 is explicitly declared) must not be defined
15211 until their definition is needed. So, we
15212 ignore interface specifications for
15213 compiler-generated functions. */
15219 {
15226 /* This is a function in a local class in an extern inline
15227 or template function. */
15229 }
15230 /* If this function belongs to an interface, it is public.
15231 If it belongs to someone else's interface, it is also external.
15232 This only affects inlines and template instantiations. */
15234 {
15237 {
15241 && ! flag_implement_inlines
15244 /* For WIN32 we also want to put these in linkonce sections. */
15246 }
15247 else
15250 /* If this function is in an interface implemented in this file,
15251 make sure that the back end knows to emit this function
15252 here. */
15255 }
15258 {
15259 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
15260 interface, we will have both finfo->interface_unknown and
15261 finfo->interface_only set. In that case, we don't want to
15262 use the normal heuristics because someone will supply a
15263 #pragma implementation elsewhere, and deducing it here would
15264 produce a conflict. */
15269 }
15270 else
15271 {
15272 /* This is a definition, not a reference.
15273 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
15281 else
15283 }
15285 /* Determine the ELF visibility attribute for the function. We must not
15286 do this before calling "pushdecl", as we must allow "duplicate_decls"
15287 to merge any attributes appropriately. We also need to wait until
15288 linkage is set. */
15302 {
15305 }
15315 /* Clobbering an empty base is harmful if it overlays real data. */
15317 /* We can't clobber safely for an implicitly-defined default constructor
15318 because part of the initialization might happen before we enter the
15319 constructor, via AGGR_INIT_ZERO_FIRST (c++/68006). */
15333 }
15336 /* Like start_preparsed_function, except that instead of a
15337 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
15339 Returns true on success. If the DECLARATOR is not suitable
15340 for a function, we return false, which tells the parser to
15341 skip the entire function. */
15343 bool
15346 tree attrs)
15347 {
15348 tree decl1;
15354 /* If the declarator is not suitable for a function definition,
15355 cause a syntax error. */
15357 {
15360 }
15363 /* main must return int. grokfndecl should have corrected it
15364 (and issued a diagnostic) if the user got it wrong. */
15366 integer_type_node));
15369 }
15370 \f
15371 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
15372 FN. */
15374 static bool
15376 {
15378 && !processing_template_decl
15380 /* We insert the EH_SPEC_BLOCK only in the original
15381 function; then, it is copied automatically to the
15382 clones. */
15384 /* Implicitly-generated constructors and destructors have
15385 exception specifications. However, those specifications
15386 are the union of the possible exceptions specified by the
15387 constructors/destructors for bases and members, so no
15388 unallowed exception will ever reach this function. By
15389 not creating the EH_SPEC_BLOCK we save a little memory,
15390 and we avoid spurious warnings about unreachable
15391 code. */
15393 }
15395 /* Store the parameter declarations into the current function declaration.
15396 This is called after parsing the parameter declarations, before
15397 digesting the body of the function.
15399 Also install to binding contour return value identifier, if any. */
15401 static void
15403 {
15405 tree parm;
15407 /* This is a chain of any other decls that came in among the parm
15408 declarations. If a parm is declared with enum {foo, bar} x;
15409 then CONST_DECLs for foo and bar are put here. */
15413 {
15414 /* This case is when the function was defined with an ANSI prototype.
15415 The parms already have decls, so we need not do anything here
15416 except record them as in effect
15417 and complain if any redundant old-style parm decls were written. */
15420 tree next;
15422 /* Must clear this because it might contain TYPE_DECLs declared
15423 at class level. */
15426 /* If we're doing semantic analysis, then we'll call pushdecl
15427 for each of these. We must do them in reverse order so that
15428 they end in the correct forward order. */
15432 {
15436 else
15437 {
15438 /* If we find an enum constant or a type tag,
15439 put it aside for the moment. */
15442 }
15443 }
15445 /* Get the decls in their original chain order and record in the
15446 function. This is all and only the PARM_DECLs that were
15447 pushed into scope by the loop above. */
15449 }
15450 else
15453 /* Now store the final chain of decls for the arguments
15454 as the decl-chain of the current lexical scope.
15455 Put the enumerators in as well, at the front so that
15456 DECL_ARGUMENTS is not modified. */
15461 }
15463 \f
15464 /* We have finished doing semantic analysis on DECL, but have not yet
15465 generated RTL for its body. Save away our current state, so that
15466 when we want to generate RTL later we know what to do. */
15468 static void
15470 {
15473 /* Save the language-specific per-function data so that we can
15474 get it back when we really expand this function. */
15477 /* Make a copy. */
15482 /* Clear out the bits we don't need. */
15487 }
15490 /* Set the return value of the constructor (if present). */
15492 static void
15494 {
15495 tree val;
15496 tree exprstmt;
15499 {
15500 /* Any return from a constructor will end up here. */
15506 /* Return the address of the object. */
15509 }
15510 }
15512 /* Do all the processing for the beginning of a destructor; set up the
15513 vtable pointers and cleanups for bases and members. */
15515 static void
15517 {
15518 tree compound_stmt;
15520 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
15521 issued an error message. We still want to try to process the
15522 body of the function, but initialize_vtbl_ptrs will crash if
15523 TYPE_BINFO is NULL. */
15525 {
15527 /* Make all virtual function table pointers in non-virtual base
15528 classes point to CURRENT_CLASS_TYPE's virtual function
15529 tables. */
15534 /* Clobbering an empty base is harmful if it overlays real data. */
15536 {
15540 {
15542 tree ref
15549 tf_warning_or_error);
15551 }
15552 else
15554 }
15556 /* And insert cleanups for our bases and members so that they
15557 will be properly destroyed if we throw. */
15559 }
15560 }
15562 /* At the end of every destructor we generate code to delete the object if
15563 necessary. Do that now. */
15565 static void
15567 {
15568 tree exprstmt;
15570 /* Any return from a destructor will end up here; that way all base
15571 and member cleanups will be run when the function returns. */
15575 {
15576 tree val;
15581 /* Return the address of the object. */
15584 }
15585 }
15587 /* Do the necessary processing for the beginning of a function body, which
15588 in this case includes member-initializers, but not the catch clauses of
15589 a function-try-block. Currently, this means opening a binding level
15590 for the member-initializers (in a ctor), member cleanups (in a dtor),
15591 and capture proxies (in a lambda operator()). */
15593 tree
15595 {
15596 tree stmt;
15603 else
15604 /* Always keep the BLOCK node associated with the outermost pair of
15605 curly braces of a function. These are needed for correct
15606 operation of dwarfout.c. */
15617 }
15619 /* Do the processing for the end of a function body. Currently, this means
15620 closing out the cleanups for fully-constructed bases and members, and in
15621 the case of the destructor, deleting the object if desired. Again, this
15622 is only meaningful for [cd]tors, since they are the only functions where
15623 there is a significant distinction between the main body and any
15624 function catch clauses. Handling, say, main() return semantics here
15625 would be wrong, as flowing off the end of a function catch clause for
15626 main() would also need to return 0. */
15628 void
15630 {
15634 /* Close the block. */
15643 }
15645 /* Given a function, returns the BLOCK corresponding to the outermost level
15646 of curly braces, skipping the artificial block created for constructor
15647 initializers. */
15649 tree
15651 {
15661 }
15663 /* If FNDECL is a class's key method, add the class to the list of
15664 keyed classes that should be emitted. */
15666 static void
15668 {
15672 {
15676 }
15677 }
15679 /* Subroutine of finish_function.
15680 Save the body of constexpr functions for possible
15681 future compile time evaluation. */
15683 static void
15685 {
15691 }
15693 /* Finish up a function declaration and compile that function
15694 all the way to assembler language output. The free the storage
15695 for the function definition. INLINE_P is TRUE if we just
15696 finished processing the body of an in-class inline function
15697 definition. (This processing will have taken place after the
15698 class definition is complete.) */
15700 tree
15702 {
15706 /* When we get some parse errors, we can end up without a
15707 current_function_decl, so cope. */
15720 /* TREE_READONLY (fndecl) = 1;
15721 This caused &foo to be of type ptr-to-const-function
15722 which then got a warning when stored in a ptr-to-function variable. */
15725 /* The current function is being defined, so its DECL_INITIAL should
15726 be set, and unless there's a multiple definition, it should be
15727 error_mark_node. */
15730 /* For a cloned function, we've already got all the code we need;
15731 there's no need to add any extra bits. */
15733 {
15734 /* Make it so that `main' always returns 0 by default. */
15741 current_eh_spec_block);
15742 }
15744 /* If we're saving up tree structure, tie off the function now. */
15749 /* If this function can't throw any exceptions, remember that. */
15752 && !flag_non_call_exceptions
15756 /* This must come after expand_function_end because cleanups might
15757 have declarations (from inline functions) that need to go into
15758 this function's blocks. */
15760 /* If the current binding level isn't the outermost binding level
15761 for this function, either there is a bug, or we have experienced
15762 syntax errors and the statement tree is malformed. */
15764 {
15765 /* Make sure we have already experienced errors. */
15768 /* Throw away the broken statement tree and extra binding
15769 levels. */
15773 {
15776 else
15778 }
15779 }
15782 /* Statements should always be full-expressions at the outermost set
15783 of curly braces for a function. */
15786 /* If there are no return statements in a function with auto return type,
15787 the return type is void. But if the declared type is something like
15788 auto*, this is an error. */
15791 {
15793 {
15796 }
15799 {
15801 current_function_auto_return_pattern);
15804 }
15805 }
15807 // If this is a concept, check that the definition is reasonable.
15811 /* Lambda closure members are implicitly constexpr if possible. */
15815 = ((processing_template_decl
15819 /* Save constexpr function body before it gets munged by
15820 the NRV transformation. */
15823 /* Invoke the pre-genericize plugin before we start munging things. */
15827 /* Perform delayed folding before NRV transformation. */
15831 /* Set up the named return value optimization, if we can. Candidate
15832 variables are selected in check_return_expr. */
15834 {
15836 tree outer;
15839 /* This is only worth doing for fns that return in memory--and
15840 simpler, since we don't have to worry about promoted modes. */
15842 /* Only allow this for variables declared in the outer scope of
15843 the function so we know that their lifetime always ends with a
15844 return; see g++.dg/opt/nrv6.C. We could be more flexible if
15845 we were to do this optimization in tree-ssa. */
15851 }
15853 /* Remember that we were in class scope. */
15857 /* Must mark the RESULT_DECL as being in this function. */
15860 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
15861 to the FUNCTION_DECL node itself. */
15864 /* Save away current state, if appropriate. */
15868 /* Complain if there's just no return statement. */
15873 /* Don't complain if we abort or throw. */
15874 && !current_function_returns_abnormally
15875 /* Don't complain if there's an infinite loop. */
15876 && !current_function_infinite_loop
15877 /* Don't complain if we are declared noreturn. */
15881 /* Structor return values (if any) are set by the compiler. */
15885 {
15889 }
15891 /* Store the end of the function, so that we get good line number
15892 info for the epilogue. */
15895 /* Complain about parameters that are only set, but never otherwise used. */
15897 && !processing_template_decl
15900 {
15901 tree decl;
15904 decl;
15918 OPT_Wunused_but_set_parameter,
15921 }
15923 /* Complain about locally defined typedefs that are not used in this
15924 function. */
15927 /* Possibly warn about unused parameters. */
15929 && !processing_template_decl
15933 /* Genericize before inlining. */
15935 {
15938 /* Clear out the bits we don't need. */
15948 }
15949 /* Clear out the bits we don't need. */
15952 /* We're leaving the context of this function, so zap cfun. It's still in
15953 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
15957 /* If this is an in-class inline definition, we may have to pop the
15958 bindings for the template parameters that we added in
15959 maybe_begin_member_template_processing when start_function was
15960 called. */
15964 /* Leave the scope of the class. */
15970 /* Clean up. */
15975 }
15976 \f
15977 /* Create the FUNCTION_DECL for a function definition.
15978 DECLSPECS and DECLARATOR are the parts of the declaration;
15979 they describe the return type and the name of the function,
15980 but twisted together in a fashion that parallels the syntax of C.
15982 This function creates a binding context for the function body
15983 as well as setting up the FUNCTION_DECL in current_function_decl.
15985 Returns a FUNCTION_DECL on success.
15987 If the DECLARATOR is not suitable for a function (it defines a datum
15988 instead), we return 0, which tells yyparse to report a parse error.
15990 May return void_type_node indicating that this method is actually
15991 a friend. See grokfield for more details.
15993 Came here with a `.pushlevel' .
15995 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
15996 CHANGES TO CODE IN `grokfield'. */
15998 tree
16001 {
16009 {
16012 }
16017 /* Pass friends other than inline friend functions back. */
16022 {
16027 }
16036 /* We process method specializations in finish_struct_1. */
16038 {
16042 }
16045 {
16047 {
16050 }
16051 }
16057 }
16058 \f
16060 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
16061 we can lay it out later, when and if its type becomes complete.
16063 Also handle constexpr variables where the initializer involves
16064 an unlowered PTRMEM_CST because the class isn't complete yet. */
16066 void
16068 {
16071 /* Keep track of variables with incomplete types. */
16074 {
16082 /* RTTI TD entries are created while defining the type_info. */
16085 {
16088 }
16092 {
16093 /* When the outermost open class is complete we can resolve any
16094 pointers-to-members. */
16098 }
16099 }
16100 }
16102 /* Called when a class type (given by TYPE) is defined. If there are
16103 any existing VAR_DECLs whose type has been completed by this
16104 declaration, update them now. */
16106 void
16108 {
16113 {
16115 {
16122 {
16123 /* Complete the type of the variable. The VAR_DECL itself
16124 will be laid out in expand_expr. */
16127 }
16129 /* Remove this entry from the list. */
16131 }
16132 else
16133 ix++;
16134 }
16136 /* Check for pending declarations which may have abstract type. */
16138 }
16140 /* If DECL is of a type which needs a cleanup, build and return an
16141 expression to perform that cleanup here. Return NULL_TREE if no
16142 cleanup need be done. DECL can also be a _REF when called from
16143 split_nonconstant_init_1. */
16145 tree
16147 {
16148 tree type;
16149 tree attr;
16150 tree cleanup;
16152 /* Assume no cleanup is required. */
16158 /* Handle "__attribute__((cleanup))". We run the cleanup function
16159 before the destructor since the destructor is what actually
16160 terminates the lifetime of the object. */
16163 else
16166 {
16167 tree id;
16168 tree fn;
16169 tree arg;
16171 /* Get the name specified by the user for the cleanup function. */
16173 /* Look up the name to find the cleanup function to call. It is
16174 important to use lookup_name here because that is what is
16175 used in c-common.c:handle_cleanup_attribute when performing
16176 initial checks on the attribute. Note that those checks
16177 include ensuring that the function found is not an overloaded
16178 function, or an object with an overloaded call operator,
16179 etc.; we can rely on the fact that the function found is an
16180 ordinary FUNCTION_DECL. */
16188 }
16189 /* Handle ordinary C++ destructors. */
16192 {
16194 tree addr;
16195 tree call;
16199 else
16210 else
16212 }
16214 /* build_delete sets the location of the destructor call to the
16215 current location, even though the destructor is going to be
16216 called later, at the end of the current scope. This can lead to
16217 a "jumpy" behavior for users of debuggers when they step around
16218 the end of the block. So let's unset the location of the
16219 destructor call instead. */
16225 /* Treat objects with destructors as used; the destructor may do
16226 something substantive. */
16231 }
16233 \f
16234 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
16235 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
16236 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
16238 tree
16240 {
16241 tree fntype;
16242 tree args;
16256 fntype = (cp_build_type_attribute_variant
16258 fntype = (build_exception_variant
16263 }
16265 /* DECL was originally constructed as a non-static member function,
16266 but turned out to be static. Update it accordingly. */
16268 void
16270 {
16283 }
16285 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
16286 one of the language-independent trees. */
16288 enum cp_tree_node_structure_enum
16290 {
16292 {
16309 }
16310 }
16312 /* Build the void_list_node (void_type_node having been created). */
16313 tree
16315 {
16318 }
16320 bool
16322 {
16323 /* A missing noreturn is ok for the `main' function. */
16325 }
16327 /* Return the decl used to identify the COMDAT group into which DECL should
16328 be placed. */
16330 tree
16332 {
16333 /* Virtual tables, construction virtual tables, and virtual table
16334 tables all go in a single COMDAT group, named after the primary
16335 virtual table. */
16338 /* For all other DECLs, the COMDAT group is the mangled name of the
16339 declaration itself. */
16340 else
16341 {
16343 {
16344 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
16345 into the same section as the target function. In that case
16346 we must return target's name. */
16352 else
16354 }
16355 }
16358 }
16360 /* Returns the return type for FN as written by the user, which may include
16361 a placeholder for a deduced return type. */
16363 tree
16365 {
16368 {
16375 }
16377 }
16379 /* Returns true iff DECL is a variable or function declared with an auto type
16380 that has not yet been deduced to a real type. */
16382 bool
16384 {
16390 }
16392 /* Complain if DECL has an undeduced return type. */
16394 bool
16396 {
16398 {
16402 }
16404 }