| blob | 9f1a171ead79066e281e82c1e33c971aa7589bc5 |
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. */
4186 /* Guess at the initial static decls size. */
4189 /* ... and keyed classes. */
4201 NULL_TREE);
4203 #if 0
4205 #endif
4214 void_ftype_ptr
4217 /* Create the conversion operator marker. This operator's DECL_NAME
4218 is in the identifier table, so we can use identifier equality to
4219 find it. */
4221 void_ftype);
4223 /* C++ extensions */
4228 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
4231 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
4232 result. */
4239 {
4240 /* Make sure we get a unique function type, so we can give
4241 its pointer type a name. (This wins for gdb.) */
4248 }
4251 vtbl_type_node
4270 /* Now, C++. */
4275 {
4278 }
4284 {
4287 tree ptr_ftype_sizetype;
4288 tree new_eh_spec;
4290 ptr_ftype_sizetype
4293 {
4294 tree bad_alloc_id;
4295 tree bad_alloc_type_node;
4296 tree bad_alloc_decl;
4302 bad_alloc_decl
4307 new_eh_spec
4309 }
4310 else
4313 /* Ensure attribs.c is initialized. */
4316 /* Ensure constraint.cc is initialized. */
4320 NULL_TREE);
4323 extvisattr);
4337 {
4338 /* Also push the sized deallocation variants:
4339 void operator delete(void*, std::size_t) throw();
4340 void operator delete[](void*, std::size_t) throw(); */
4341 tree void_ftype_ptr_size
4345 extvisattr);
4349 }
4352 {
4359 /* operator new (size_t, align_val_t); */
4371 /* operator delete (void *, align_val_t); */
4380 {
4381 /* operator delete (void *, size_t, align_val_t); */
4384 NULL_TREE);
4389 }
4390 }
4402 }
4404 abort_fndecl
4408 /* Perform other language dependent initializations. */
4422 /* Show we use EH for cleanups. */
4425 }
4427 /* Generate an initializer for a function naming variable from
4428 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
4429 filled in with the type of the init. */
4431 tree
4433 {
4435 tree type;
4440 {
4444 }
4453 else
4457 }
4459 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
4460 the decl, LOC is the location to give the decl, NAME is the
4461 initialization string and TYPE_DEP indicates whether NAME depended
4462 on the type of the function. We make use of that to detect
4463 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
4464 at the point of first use, so we mustn't push the decl now. */
4466 static tree
4468 {
4471 tree type;
4485 {
4489 LOOKUP_ONLYCONVERTING);
4490 }
4491 else
4492 {
4495 }
4498 }
4500 static tree
4502 {
4510 /* Runtime library routines are, by definition, available in an
4511 external shared object. */
4517 /* A function in the user's namespace should have an explicit
4518 declaration before it is used. Mark the built-in function as
4519 anticipated but not actually declared. */
4523 {
4526 /* Treat __*_chk fortification functions as anticipated as well,
4527 unless they are __builtin_*. */
4532 }
4536 else
4540 }
4542 tree
4544 {
4547 /* All builtins that don't begin with an '_' should additionally
4548 go in the 'std' namespace. */
4550 {
4555 }
4558 }
4560 /* Like cxx_builtin_function, but guarantee the function is added to the global
4561 scope. This is to allow function specific options to add new machine
4562 dependent builtins when the target ISA changes via attribute((target(...)))
4563 which saves space on program startup if the program does not use non-generic
4564 ISAs. */
4566 tree
4568 {
4572 /* All builtins that don't begin with an '_' should additionally
4573 go in the 'std' namespace. */
4575 {
4580 }
4583 }
4585 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
4586 function. Not called directly. */
4588 static tree
4591 {
4599 /* Runtime library routines are, by definition, available in an
4600 external shared object. */
4605 }
4607 /* Returns the _DECL for a library function with C++ linkage. */
4609 static tree
4612 {
4617 }
4619 /* Like build_library_fn, but takes a C string instead of an
4620 IDENTIFIER_NODE. */
4622 tree
4624 {
4626 }
4628 /* Like build_cp_library_fn, but takes a C string instead of an
4629 IDENTIFIER_NODE. */
4631 tree
4633 {
4635 ecf_flags);
4636 }
4638 /* Like build_library_fn, but also pushes the function so that we will
4639 be able to find it via get_global_binding. Also, the function
4640 may throw exceptions listed in RAISES. */
4642 tree
4644 {
4645 tree fn;
4653 }
4655 /* Like build_cp_library_fn, but also pushes the function so that it
4656 will be found by normal lookup. */
4658 static tree
4661 {
4668 }
4670 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
4671 a FUNCTION_TYPE. */
4673 tree
4675 {
4678 }
4680 /* Like push_library_fn, but also note that this function throws
4681 and does not return. Used for __throw_foo and the like. */
4683 tree
4685 {
4688 }
4689 \f
4690 /* When we call finish_struct for an anonymous union, we create
4691 default copy constructors and such. But, an anonymous union
4692 shouldn't have such things; this function undoes the damage to the
4693 anonymous union type T.
4695 (The reason that we create the synthesized methods is that we don't
4696 distinguish `union { int i; }' from `typedef union { int i; } U'.
4697 The first is an anonymous union; the second is just an ordinary
4698 union type.) */
4700 void
4702 {
4703 /* Wipe out memory of synthesized methods. */
4711 /* Splice the implicitly generated functions out of TYPE_FIELDS. */
4715 else
4718 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4719 assignment operators (because they cannot have these methods themselves).
4720 For anonymous unions this is already checked because they are not allowed
4721 in any union, otherwise we have to check it. */
4723 {
4728 {
4731 {
4741 }
4742 }
4743 }
4744 }
4746 /* Warn for an attribute located at LOCATION that appertains to the
4747 class type CLASS_TYPE that has not been properly placed after its
4748 class-key, in it class-specifier. */
4750 void
4752 tree class_type)
4753 {
4757 "attribute ignored in declaration "
4762 }
4764 /* Make sure that a declaration with no declarator is well-formed, i.e.
4765 just declares a tagged type or anonymous union.
4767 Returns the type declared; or NULL_TREE if none. */
4769 tree
4772 {
4775 /* If a class, struct, or enum type is declared by the DECLSPECS
4776 (i.e, if a class-specifier, enum-specifier, or non-typename
4777 elaborated-type-specifier appears in the DECLSPECS),
4778 DECLARED_TYPE is set to the corresponding type. */
4785 {
4791 }
4804 {
4806 "%<auto%> can only be specified for variables "
4809 }
4810 /* Check for an anonymous union. */
4813 {
4814 /* 7/3 In a simple-declaration, the optional init-declarator-list
4815 can be omitted only when declaring a class (clause 9) or
4816 enumeration (7.2), that is, when the decl-specifier-seq contains
4817 either a class-specifier, an elaborated-type-specifier with
4818 a class-key (9.1), or an enum-specifier. In these cases and
4819 whenever a class-specifier or enum-specifier is present in the
4820 decl-specifier-seq, the identifiers in these specifiers are among
4821 the names being declared by the declaration (as class-name,
4822 enum-names, or enumerators, depending on the syntax). In such
4823 cases, and except for the declaration of an unnamed bit-field (9.6),
4824 the decl-specifier-seq shall introduce one or more names into the
4825 program, or shall redeclare a name introduced by a previous
4826 declaration. [Example:
4827 enum { }; // ill-formed
4828 typedef class { }; // ill-formed
4829 --end example] */
4831 {
4834 }
4841 }
4843 else
4844 {
4852 && (!current_class_type
4861 "a storage class can only be specified for objects "
4865 "%<const%> can only be specified for objects and "
4869 "%<volatile%> can only be specified for objects and "
4873 "%<__restrict%> can only be specified for objects and "
4877 "%<__thread%> can only be specified for objects "
4885 }
4888 {
4889 location_t loc;
4892 /* For a non-template class, use the name location. */
4894 else
4895 /* For a template class (an explicit instantiation), use the
4896 current location. */
4900 /* [dcl.attr.grammar]/4:
4902 No attribute-specifier-seq shall appertain to an explicit
4903 instantiation. */
4904 {
4907 declared_type))
4909 "no attribute can be applied to "
4911 }
4912 else
4914 }
4917 }
4919 /* Called when a declaration is seen that contains no names to declare.
4920 If its type is a reference to a structure, union or enum inherited
4921 from a containing scope, shadow that tag name for the current scope
4922 with a forward reference.
4923 If its type defines a new named structure or union
4924 or defines an enum, it is valid but we need not do anything here.
4925 Otherwise, it is an error.
4927 C++: may have to grok the declspecs to learn about static,
4928 complain for anonymous unions.
4930 Returns the TYPE declared -- or NULL_TREE if none. */
4932 tree
4934 {
4944 /* This is where the variables in an anonymous union are
4945 declared. An anonymous union declaration looks like:
4946 union { ... } ;
4947 because there is no declarator after the union, the parser
4948 sends that declaration here. */
4950 {
4954 {
4958 }
4959 }
4962 }
4963 \f
4964 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4966 tree
4970 {
4971 tree attrs;
4972 tree type;
4973 enum decl_context context
4979 {
4984 /* A template type parameter or other dependent type. */
4987 else
4989 }
4991 }
4993 /* Process a DECLARATOR for a function-scope variable declaration,
4994 namespace-scope variable declaration, or function declaration.
4995 (Function definitions go through start_function; class member
4996 declarations appearing in the body of the class go through
4997 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4998 If an error occurs, the error_mark_node is returned instead.
5000 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
5001 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
5002 for an explicitly defaulted function, or SD_DELETED for an explicitly
5003 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
5004 implicitly initialized via a default constructor. ATTRIBUTES and
5005 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
5007 The scope represented by the context of the returned DECL is pushed
5008 (if it is not the global namespace) and is assigned to
5009 *PUSHED_SCOPE_P. The caller is then responsible for calling
5010 pop_scope on *PUSHED_SCOPE_P if it is set. */
5012 tree
5016 tree attributes,
5017 tree prefix_attributes,
5019 {
5020 tree decl;
5021 tree context;
5028 /* An object declared as __attribute__((deprecated)) suppresses
5029 warnings of uses of other deprecated items. */
5048 /* Is it valid for this decl to have an initializer at all?
5049 If not, set INITIALIZED to zero, which will indirectly
5050 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
5053 {
5056 }
5059 {
5063 decl);
5067 }
5073 /* If this is a typedef that names the class for linkage purposes
5074 (7.1.3p8), apply any attributes directly to the type. */
5079 else
5082 /* Set attributes here so if duplicate decl, will have proper attributes. */
5085 /* Dllimported symbols cannot be defined. Static data members (which
5086 can be initialized in-class and dllimported) go through grokfield,
5087 not here, so we don't need to exclude those decls when checking for
5088 a definition. */
5090 {
5093 }
5095 /* If #pragma weak was used, mark the decl weak now. */
5107 {
5111 {
5121 {
5127 }
5128 else
5129 {
5134 {
5141 }
5142 /* Static data member are tricky; an in-class initialization
5143 still doesn't provide a definition, so the in-class
5144 declaration will have DECL_EXTERNAL set, but will have an
5145 initialization. Thus, duplicate_decls won't warn
5146 about this situation, and so we check here. */
5155 }
5156 }
5157 else
5158 {
5160 this_tmpl
5161 ? current_template_parms
5167 }
5169 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
5171 /* Do not mark DECL as an explicit specialization if it was not
5172 already marked as an instantiation; a declaration should
5173 never be marked as a specialization unless we know what
5174 template is being specialized. */
5176 {
5181 else
5184 /* [temp.expl.spec] An explicit specialization of a static data
5185 member of a template is a definition if the declaration
5186 includes an initializer; otherwise, it is a declaration.
5188 We check for processing_specialization so this only applies
5189 to the new specialization syntax. */
5192 }
5195 /* Aliases are definitions. */
5198 decl);
5199 }
5203 /* Enter this declaration into the symbol table. Don't push the plain
5204 VAR_DECL for a variable template. */
5217 {
5218 /* This is a const variable with implicit 'static'. Set
5219 DECL_THIS_STATIC so we can tell it from variables that are
5220 !TREE_PUBLIC because of the anonymous namespace. */
5223 }
5227 {
5231 decl);
5234 else
5238 }
5244 }
5246 /* Process the declaration of a variable DECL. INITIALIZED is true
5247 iff DECL is explicitly initialized. (INITIALIZED is false if the
5248 variable is initialized via an implicitly-called constructor.)
5249 This function must be called for ordinary variables (including, for
5250 example, implicit instantiations of templates), but must not be
5251 called for template declarations. */
5253 void
5255 {
5256 tree type;
5271 /* If an explicit initializer is present, or if this is a definition
5272 of an aggregate, then we need a complete type at this point.
5273 (Scalars are always complete types, so there is nothing to
5274 check.) This code just sets COMPLETE_P; errors (if necessary)
5275 are issued below. */
5277 && !complete_p
5279 {
5281 /* We will not yet have set TREE_READONLY on DECL if the type
5282 was "const", but incomplete, before this point. But, now, we
5283 have a complete type, so we can try again. */
5285 }
5288 /* Is it valid for this decl to have an initializer at all? */
5289 {
5290 /* Don't allow initializations for incomplete types except for
5291 arrays which might be completed by the initialization. */
5297 {
5300 }
5302 {
5305 /* else we already gave an error in start_decl. */
5306 }
5307 }
5309 {
5312 else
5313 {
5315 decl);
5316 /* Change the type so that assemble_variable will give
5317 DECL an rtl we can live with: (mem (const_int 0)). */
5319 }
5320 }
5322 /* Create a new scope to hold this declaration if necessary.
5323 Whether or not a new scope is necessary cannot be determined
5324 until after the type has been completed; if the type is a
5325 specialization of a class template it is not until after
5326 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
5327 will be set correctly. */
5329 }
5331 /* Handle initialization of references. DECL, TYPE, and INIT have the
5332 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
5333 but will be set to a new CLEANUP_STMT if a temporary is created
5334 that must be destroyed subsequently.
5336 Returns an initializer expression to use to initialize DECL, or
5337 NULL if the initialization can be performed statically.
5339 Quotes on semantics can be found in ARM 8.4.3. */
5341 static tree
5343 {
5345 {
5351 }
5355 tf_warning_or_error);
5360 /* Note: default conversion is only called in very special cases. */
5363 /* check_initializer handles this for non-reference variables, but for
5364 references we need to do it here or the initializer will get the
5365 incomplete array type and confuse later calls to
5366 cp_complete_array_type. */
5371 {
5375 }
5377 /* Convert INIT to the reference type TYPE. This may involve the
5378 creation of a temporary, whose lifetime must be the same as that
5379 of the reference. If so, a DECL_EXPR for the temporary will be
5380 added just after the DECL_EXPR for DECL. That's why we don't set
5381 DECL_INITIAL for local references (instead assigning to them
5382 explicitly); we need to allow the temporary to be initialized
5383 first. */
5385 tf_warning_or_error);
5386 }
5388 /* Designated initializers in arrays are not supported in GNU C++.
5389 The parser cannot detect this error since it does not know whether
5390 a given brace-enclosed initializer is for a class type or for an
5391 array. This function checks that CE does not use a designated
5392 initializer. If it does, an error is issued. Returns true if CE
5393 is valid, i.e., does not have a designated initializer. */
5395 bool
5398 {
5399 /* Designated initializers for array elements are not supported. */
5401 {
5402 /* The parser only allows identifiers as designated
5403 initializers. */
5405 {
5409 }
5411 {
5415 }
5423 {
5424 /* A C99 designator is OK if it matches the current index. */
5426 {
5429 }
5430 else
5432 }
5433 else
5438 }
5441 }
5443 /* When parsing `int a[] = {1, 2};' we don't know the size of the
5444 array until we finish parsing the initializer. If that's the
5445 situation we're in, update DECL accordingly. */
5447 static void
5449 {
5455 {
5456 /* do_default is really a C-ism to deal with tentative definitions.
5457 But let's leave it here to ease the eventual merge. */
5462 /* Check that there are no designated initializers in INIT, as
5463 those are not supported in GNU C++, and as the middle-end
5464 will crash if presented with a non-numeric designated
5465 initializer. */
5467 {
5470 HOST_WIDE_INT i;
5472 {
5477 }
5478 }
5482 else
5483 {
5485 do_default);
5487 {
5491 }
5493 {
5495 {
5498 }
5499 /* If a `static' var's size isn't known, make it extern as
5500 well as static, so it does not get allocated. If it's not
5501 `static', then don't mark it extern; finish_incomplete_decl
5502 will give it a default size and it will get allocated. */
5505 }
5507 {
5510 }
5511 }
5516 }
5517 }
5519 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
5520 any appropriate error messages regarding the layout. */
5522 static void
5524 {
5525 tree type;
5531 /* If we haven't already laid out this declaration, do so now.
5532 Note that we must not call complete type for an external object
5533 because it's type might involve templates that we are not
5534 supposed to instantiate yet. (And it's perfectly valid to say
5535 `extern X x' for some incomplete type `X'.) */
5544 {
5545 /* An automatic variable with an incomplete type: that is an error.
5546 Don't talk about array types here, since we took care of that
5547 message in grokdeclarator. */
5551 }
5552 #if 0
5553 /* Keep this code around in case we later want to control debug info
5554 based on whether a type is "used". (jason 1999-11-11) */
5557 /* Let debugger know it should output info for this type. */
5562 #endif
5567 {
5570 else
5571 {
5575 }
5576 }
5577 }
5579 /* If a local static variable is declared in an inline function, or if
5580 we have a weak definition, we must endeavor to create only one
5581 instance of the variable at link-time. */
5583 void
5585 {
5586 /* Static data in a function with comdat linkage also has comdat
5587 linkage. */
5589 /* Don't mess with __FUNCTION__. */
5594 {
5596 {
5597 /* With weak symbols, we simply make the variable COMDAT;
5598 that will cause copies in multiple translations units to
5599 be merged. */
5601 }
5602 else
5603 {
5606 {
5607 /* Without weak symbols, we can use COMMON to merge
5608 uninitialized variables. */
5611 }
5612 else
5613 {
5614 /* While for initialized variables, we must use internal
5615 linkage -- which means that multiple copies will not
5616 be merged. */
5622 "%q#D are wrong (you%'ll wind up with "
5624 else
5626 "static data %q#D are wrong (you%'ll wind "
5632 }
5633 }
5634 }
5635 }
5637 /* Issue an error message if DECL is an uninitialized const variable.
5638 CONSTEXPR_CONTEXT_P is true when the function is called in a constexpr
5639 context from potential_constant_expression. Returns true if all is well,
5640 false otherwise. */
5642 bool
5644 tsubst_flags_t complain)
5645 {
5648 /* ``Unless explicitly declared extern, a const object does not have
5649 external linkage and must be initialized. ($8.4; $12.1)'' ARM
5650 7.1.6 */
5653 && (constexpr_context_p
5656 {
5662 {
5664 {
5668 }
5669 else
5670 {
5674 "uninitialized variable %qD in %<constexpr%> "
5677 }
5678 }
5682 decl);
5685 {
5686 tree defaulted_ctor;
5693 "constructor is not user-provided because it is "
5696 "and the implicitly-defined constructor does not "
5698 }
5701 }
5704 }
5705 \f
5706 /* Structure holding the current initializer being processed by reshape_init.
5707 CUR is a pointer to the current element being processed, END is a pointer
5708 after the last element present in the initializer. */
5709 struct reshape_iter
5710 {
5713 };
5717 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
5718 returned is the next FIELD_DECL (possibly FIELD itself) that can be
5719 initialized. If there are no more such fields, the return value
5720 will be NULL. */
5722 tree
5724 {
5733 }
5735 /* Return true for [dcl.init.list] direct-list-initialization from
5736 single element of enumeration with a fixed underlying type. */
5738 bool
5740 {
5749 }
5751 /* Subroutine of reshape_init_array and reshape_init_vector, which does
5752 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
5753 INTEGER_CST representing the size of the array minus one (the maximum index),
5754 or NULL_TREE if the array was declared without specifying the size. D is
5755 the iterator within the constructor. */
5757 static tree
5759 tsubst_flags_t complain)
5760 {
5761 tree new_init;
5766 /* The initializer for an array is always a CONSTRUCTOR. */
5770 {
5771 /* Minus 1 is used for zero sized arrays. */
5777 /* sizetype is sign extended, not zero extended. */
5778 else
5780 }
5782 /* Loop until there are no more initializers. */
5786 {
5787 tree elt_init;
5792 complain);
5800 /* This can happen with an invalid initializer (c++/54501). */
5803 }
5806 }
5808 /* Subroutine of reshape_init_r, processes the initializers for arrays.
5809 Parameters are the same of reshape_init_r. */
5811 static tree
5813 {
5822 }
5824 /* Subroutine of reshape_init_r, processes the initializers for vectors.
5825 Parameters are the same of reshape_init_r. */
5827 static tree
5829 {
5835 {
5838 {
5843 }
5846 }
5848 /* For a vector, we initialize it as an array of the appropriate size. */
5853 }
5855 /* Subroutine of reshape_init_r, processes the initializers for classes
5856 or union. Parameters are the same of reshape_init_r. */
5858 static tree
5860 tsubst_flags_t complain)
5861 {
5862 tree field;
5863 tree new_init;
5867 /* The initializer for a class is always a CONSTRUCTOR. */
5872 {
5873 /* [dcl.init.aggr]
5875 An initializer for an aggregate member that is an
5876 empty class shall have the form of an empty
5877 initializer-list {}. */
5879 {
5883 }
5885 }
5887 /* Loop through the initializable fields, gathering initializers. */
5889 {
5890 tree field_init;
5893 /* Handle designated initializers, as an extension. */
5895 {
5900 {
5901 /* We already reshaped this. */
5903 {
5909 }
5910 }
5913 else
5914 {
5919 }
5922 {
5927 }
5928 }
5930 /* If we processed all the member of the class, we are done. */
5940 {
5941 /* This can happen with an invalid initializer for a flexible
5942 array member (c++/54441). */
5946 }
5950 /* [dcl.init.aggr]
5952 When a union is initialized with a brace-enclosed
5953 initializer, the braces shall only contain an
5954 initializer for the first member of the union. */
5959 }
5962 }
5964 /* Subroutine of reshape_init_r. We're in a context where C99 initializer
5965 designators are not valid; either complain or return true to indicate
5966 that reshape_init_r should return error_mark_node. */
5968 static bool
5970 {
5972 {
5976 else
5978 }
5980 }
5982 /* Subroutine of reshape_init, which processes a single initializer (part of
5983 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5984 iterator within the CONSTRUCTOR which points to the initializer to process.
5985 FIRST_INITIALIZER_P is true if this is the first initializer of the
5986 outermost CONSTRUCTOR node. */
5988 static tree
5990 tsubst_flags_t complain)
5991 {
6002 {
6003 /* A complex type can be initialized from one or two initializers,
6004 but braces are not elided. */
6007 {
6009 {
6012 else
6014 }
6015 }
6017 {
6025 }
6027 }
6029 /* A non-aggregate type is always initialized with a single
6030 initializer. */
6032 {
6033 /* It is invalid to initialize a non-aggregate type with a
6034 brace-enclosed initializer before C++0x.
6035 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
6036 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
6037 a CONSTRUCTOR (with a record type). */
6039 /* Don't complain about a capture-init. */
6042 {
6044 {
6046 /* Isn't value-initialization. */
6048 {
6051 type);
6053 }
6054 }
6055 else
6057 }
6061 }
6063 /* "If T is a class type and the initializer list has a single element of
6064 type cv U, where U is T or a class derived from T, the object is
6065 initialized from that element." Even if T is an aggregate. */
6067 && first_initializer_p
6070 {
6073 }
6075 /* [dcl.init.aggr]
6077 All implicit type conversions (clause _conv_) are considered when
6078 initializing the aggregate member with an initializer from an
6079 initializer-list. If the initializer can initialize a member,
6080 the member is initialized. Otherwise, if the member is itself a
6081 non-empty subaggregate, brace elision is assumed and the
6082 initializer is considered for the initialization of the first
6083 member of the subaggregate. */
6085 /* But don't try this for the first initializer, since that would be
6086 looking through the outermost braces; A a2 = { a1 }; is not a
6087 valid aggregate initialization. */
6088 && !first_initializer_p
6091 complain)))
6092 {
6095 }
6097 /* [dcl.init.string]
6099 A char array (whether plain char, signed char, or unsigned char)
6100 can be initialized by a string-literal (optionally enclosed in
6101 braces); a wchar_t array can be initialized by a wide
6102 string-literal (optionally enclosed in braces). */
6105 {
6108 /* Strip one level of braces if and only if they enclose a single
6109 element (as allowed by [dcl.init.string]). */
6113 {
6115 }
6117 /* If it's a string literal, then it's the initializer for the array
6118 as a whole. Otherwise, continue with normal initialization for
6119 array types (one value per array element). */
6121 {
6126 }
6127 }
6129 /* The following cases are about aggregates. If we are not within a full
6130 initializer already, and there is not a CONSTRUCTOR, it means that there
6131 is a missing set of braces (that is, we are processing the case for
6132 which reshape_init exists). */
6134 {
6136 {
6138 /* There is no need to reshape pointer-to-member function
6139 initializers, as they are always constructed correctly
6140 by the front end. */
6141 ;
6143 /* For a nested compound literal, there is no need to reshape since
6144 brace elision is not allowed. Even if we decided to allow it,
6145 we should add a call to reshape_init in finish_compound_literal,
6146 before calling digest_init, so changing this code would still
6147 not be necessary. */
6149 else
6150 {
6154 }
6155 }
6160 type);
6161 }
6163 /* Dispatch to specialized routines. */
6170 else
6172 }
6174 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
6175 brace-enclosed aggregate initializer.
6177 INIT is the CONSTRUCTOR containing the list of initializers describing
6178 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
6179 It may not presently match the shape of the TYPE; for example:
6181 struct S { int a; int b; };
6182 struct S a[] = { 1, 2, 3, 4 };
6184 Here INIT will hold a vector of four elements, rather than a
6185 vector of two elements, each itself a vector of two elements. This
6186 routine transforms INIT from the former form into the latter. The
6187 revised CONSTRUCTOR node is returned. */
6189 tree
6191 {
6193 reshape_iter d;
6194 tree new_init;
6200 /* An empty constructor does not need reshaping, and it is always a valid
6201 initializer. */
6205 /* Handle [dcl.init.list] direct-list-initialization from
6206 single element of enumeration with a fixed underlying type. */
6208 {
6212 {
6216 }
6217 else
6219 }
6221 /* Recurse on this CONSTRUCTOR. */
6229 /* Make sure all the element of the constructor were used. Otherwise,
6230 issue an error about exceeding initializers. */
6232 {
6236 }
6243 }
6245 /* Verify array initializer. Returns true if errors have been reported. */
6247 bool
6249 {
6252 /* The array type itself need not be complete, because the
6253 initializer may tell us how many elements are in the array.
6254 But, the elements of the array must be complete. */
6256 {
6260 else
6263 }
6264 /* A compound literal can't have variable size. */
6268 {
6271 }
6273 }
6275 /* Subroutine of check_initializer; args are passed down from that function.
6276 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
6278 static tree
6281 {
6284 }
6286 /* Verify INIT (the initializer for DECL), and record the
6287 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
6288 grok_reference_init.
6290 If the return value is non-NULL, it is an expression that must be
6291 evaluated dynamically to initialize DECL. */
6293 static tree
6295 {
6298 tree core_type;
6300 /* Things that are going to be initialized need to have complete
6301 type. */
6305 {
6306 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
6307 it doesn't have storage to be initialized. */
6310 }
6313 /* We will have already complained. */
6317 {
6320 }
6322 {
6327 }
6328 else
6329 /* There is no way to make a variable-sized class type in GNU C++. */
6333 {
6336 {
6338 {
6341 }
6343 {
6345 "scalar object %qD requires one element in "
6349 }
6350 }
6351 }
6354 {
6361 }
6363 ;
6366 {
6368 {
6371 }
6374 tf_warning_or_error);
6375 /* Do not reshape constructors of vectors (they don't need to be
6376 reshaped. */
6378 {
6380 {
6382 tf_warning_or_error);
6384 }
6386 {
6387 /* Don't reshape if the class has constructors. */
6390 "in C++98 %qD must be initialized by "
6392 decl);
6393 }
6395 {
6398 }
6399 else
6400 {
6403 }
6404 }
6408 {
6411 /* We get here with code like `int a (2);' */
6413 tf_warning_or_error);
6414 }
6416 /* If DECL has an array type without a specific bound, deduce the
6417 array size from the initializer. */
6431 {
6434 /* A constructor call is a non-trivial initializer even if
6435 it isn't explicitly written. */
6439 /* If this is a constexpr initializer, expand_default_init will
6440 have returned an INIT_EXPR rather than a CALL_EXPR. In that
6441 case, pull the initializer back out and pass it down into
6442 store_init_value. */
6447 {
6450 /* Don't call digest_init; it's unnecessary and will complain
6451 about aggregate initialization of non-aggregate classes. */
6453 }
6455 {
6456 /* Declared constexpr, but no suitable initializer; massage
6457 init appropriately so we can pass it into store_init_value
6458 for the error. */
6461 {
6465 }
6467 }
6468 else
6470 }
6473 {
6474 /* In aggregate initialization of a variable, each element
6475 initialization is a full-expression because there is no
6476 enclosing expression. */
6491 }
6492 }
6493 else
6494 {
6502 tf_warning_or_error);
6503 }
6509 {
6510 /* We might have set these in cp_finish_decl. */
6513 }
6517 {
6525 else
6529 {
6533 }
6535 }
6538 }
6540 /* If DECL is not a local variable, give it RTL. */
6542 static void
6544 {
6548 /* Set the DECL_ASSEMBLER_NAME for the object. */
6550 {
6551 /* The `register' keyword, when used together with an
6552 asm-specification, indicates that the variable should be
6553 placed in a particular register. */
6555 {
6558 }
6559 else
6560 {
6565 }
6566 }
6568 /* Handle non-variables up front. */
6570 {
6573 }
6575 /* If we see a class member here, it should be a static data
6576 member. */
6578 {
6580 /* An in-class declaration of a static data member should be
6581 external; it is only a declaration, and not a definition. */
6586 }
6588 /* We don't create any RTL for local variables. */
6592 /* We defer emission of local statics until the corresponding
6593 DECL_EXPR is expanded. But with constexpr its function might never
6594 be expanded, so go ahead and tell cgraph about the variable now. */
6599 /* Defer template instantiations. */
6604 /* If we're not deferring, go ahead and assemble the variable. */
6607 }
6609 /* walk_tree helper for wrap_temporary_cleanups, below. */
6611 static tree
6613 {
6614 /* Stop at types or full-expression boundaries. */
6617 {
6620 }
6623 {
6628 /* Tell honor_protect_cleanup_actions to handle this as a separate
6629 cleanup. */
6633 }
6636 }
6638 /* We're initializing a local variable which has a cleanup GUARD. If there
6639 are any temporaries used in the initializer INIT of this variable, we
6640 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
6641 variable will be cleaned up properly if one of them throws.
6643 Unfortunately, there's no way to express this properly in terms of
6644 nesting, as the regions for the temporaries overlap the region for the
6645 variable itself; if there are two temporaries, the variable needs to be
6646 the first thing destroyed if either of them throws. However, we only
6647 want to run the variable's cleanup if it actually got constructed. So
6648 we need to guard the temporary cleanups with the variable's cleanup if
6649 they are run on the normal path, but not if they are run on the
6650 exceptional path. We implement this by telling
6651 honor_protect_cleanup_actions to strip the variable cleanup from the
6652 exceptional path. */
6654 static void
6656 {
6658 }
6660 /* Generate code to initialize DECL (a local variable). */
6662 static void
6664 {
6666 tree cleanup;
6674 {
6675 /* If we used it already as memory, it must stay in memory. */
6679 }
6684 /* Compute and store the initial value. */
6689 /* Generate a cleanup, if necessary. */
6692 /* Perform the initialization. */
6694 {
6698 {
6699 /* Stick simple initializers in DECL_INITIAL so that
6700 -Wno-init-self works (c++/34772). */
6705 {
6709 OPT_Winit_self,
6711 }
6712 }
6713 else
6714 {
6717 /* If we're only initializing a single object, guard the
6718 destructors of any temporaries used in its initializer with
6719 its destructor. This isn't right for arrays because each
6720 element initialization is a full-expression. */
6729 saved_stmts_are_full_exprs_p;
6730 }
6731 }
6733 /* Set this to 0 so we can tell whether an aggregate which was
6734 initialized was ever used. Don't do this if it has a
6735 destructor, so we don't complain about the 'resource
6736 allocation is initialization' idiom. Now set
6737 attribute((unused)) on types so decls of that type will be
6738 marked used. (see TREE_USED, above.) */
6740 && ! already_used
6749 }
6751 /* DECL is a VAR_DECL for a compiler-generated variable with static
6752 storage duration (like a virtual table) whose initializer is a
6753 compile-time constant. Initialize the variable and provide it to the
6754 back end. */
6756 void
6758 {
6759 tree init;
6769 }
6771 /* INIT is the initializer for a variable, as represented by the
6772 parser. Returns true iff INIT is value-dependent. */
6774 static bool
6776 {
6778 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
6781 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
6782 {
6795 }
6796 else
6797 /* It must be a simple expression, e.g., int i = 3; */
6801 }
6803 // Returns true if a DECL is VAR_DECL with the concept specifier.
6806 {
6808 // Not all variables have DECL_LANG_SPECIFIC.
6811 }
6813 /* A helper function to be called via walk_tree. If any label exists
6814 under *TP, it is (going to be) forced. Set has_forced_label_in_static. */
6816 static tree
6818 {
6824 }
6826 /* Finish processing of a declaration;
6827 install its line number and initial value.
6828 If the length of an array type is not known before,
6829 it must be determined now, from the initial value, or it is an error.
6831 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
6832 true, then INIT is an integral constant expression.
6834 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
6835 if the (init) syntax was used. */
6837 void
6840 {
6841 tree type;
6846 tree auto_node;
6851 {
6855 }
6858 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
6865 /* Warn about register storage specifiers except when in GNU global
6866 or local register variable extension. */
6868 {
6871 "ISO C++17 does not allow %<register%> storage "
6873 else
6876 }
6878 /* If a name was specified, get the string. */
6893 {
6894 tree d_init;
6896 {
6900 {
6901 /* init is null because we're deferring instantiating the
6902 initializer until we need it. Well, we need it now. */
6905 }
6908 }
6911 {
6915 tf_warning_or_error);
6917 }
6927 {
6932 }
6934 }
6937 {
6940 {
6943 }
6944 }
6952 {
6953 tree clone;
6955 {
6956 /* FIXME check this is 1st decl. */
6961 {
6965 }
6967 }
6969 {
6972 else
6974 }
6975 }
6978 {
6980 /* If DECL is a reference, then we want to know whether init is a
6981 reference constant; init_const_expr_p as passed tells us whether
6982 it's an rvalue constant. */
6986 {
6987 /* Set these flags now for templates. We'll update the flags in
6988 store_init_value for instantiations. */
6991 /* FIXME setting TREE_CONSTANT on refs breaks the back end. */
6994 }
6995 }
6998 {
7001 /* Add this declaration to the statement-tree. */
7008 {
7011 }
7013 /* Generally, initializers in templates are expanded when the
7014 template is instantiated. But, if DECL is a variable constant
7015 then it can be used in future constant expressions, so its value
7016 must be available. */
7023 {
7026 }
7028 && init_const_expr_p
7032 {
7033 /* This variable seems to be a non-dependent constant, so process
7034 its initializer. If check_initializer returns non-null the
7035 initialization wasn't constant after all. */
7036 tree init_code;
7042 }
7044 {
7045 /* Deduce array size even if the initializer is dependent. */
7047 /* And complain about multiple initializers. */
7051 tf_warning_or_error);
7052 }
7055 {
7059 }
7061 {
7064 }
7066 }
7068 /* Just store non-static data member initializers for later. */
7072 /* Take care of TYPE_DECLs up front. */
7074 {
7077 {
7081 }
7083 /* If we have installed this as the canonical typedef for this
7084 type, and that type has not been defined yet, delay emitting
7085 the debug information for it, as we will emit it later. */
7091 at_eof);
7093 }
7095 /* A reference will be modified here, as it is initialized. */
7099 {
7102 }
7105 {
7106 /* If this is a local variable that will need a mangled name,
7107 register it now. We must do this before processing the
7108 initializer for the variable, since the initialization might
7109 require a guard variable, and since the mangled name of the
7110 guard variable will depend on the mangled name of this
7111 variable. */
7115 {
7117 /* Normally has_forced_label_in_static is set during GIMPLE
7118 lowering, but [cd]tors are never actually compiled directly.
7119 We need to set this early so we can deal with the label
7120 address extension. */
7124 {
7127 }
7128 /* And make sure it's in the symbol table for
7129 c_parse_final_cleanups to find. */
7131 }
7133 /* Convert the initializer to the type of DECL, if we have not
7134 already initialized DECL. */
7136 /* If !DECL_EXTERNAL then DECL is being defined. In the
7137 case of a static data member initialized inside the
7138 class-specifier, there can be an initializer even if DECL
7139 is *not* defined. */
7141 {
7145 /* Handle:
7147 [dcl.init]
7149 The memory occupied by any object of static storage
7150 duration is zero-initialized at program startup before
7151 any other initialization takes place.
7153 We cannot create an appropriate initializer until after
7154 the type of DECL is finalized. If DECL_INITIAL is set,
7155 then the DECL is statically initialized, and any
7156 necessary zero-initialization has already been performed. */
7161 /* Remember that the initialization for this variable has
7162 taken place. */
7164 /* This declaration is the definition of this variable,
7165 unless we are initializing a static data member within
7166 the class specifier. */
7169 }
7170 /* If the variable has an array type, lay out the type, even if
7171 there is no initializer. It is valid to index through the
7172 array, and we must get TYPE_ALIGN set correctly on the array
7173 type. */
7180 /* So decl is a global variable or a static member of a
7181 non local class. Record the types it uses
7182 so that we can decide later to emit debug info for them. */
7184 }
7186 /* Add this declaration to the statement-tree. This needs to happen
7187 after the call to check_initializer so that the DECL_EXPR for a
7188 reference temp is added before the DECL_EXPR for the reference itself. */
7190 {
7191 /* If we're building a variable sized type, and we might be
7192 reachable other than via the top of the current binding
7193 level, then create a new BIND_EXPR so that we deallocate
7194 the object at the right time. */
7199 {
7200 tree bind;
7205 }
7207 }
7209 /* Let the middle end know about variables and functions -- but not
7210 static data members in uninstantiated class templates. */
7212 {
7214 {
7217 }
7219 /* This needs to happen after the linkage is set. */
7223 {
7224 /* If a TREE_READONLY variable needs initialization
7225 at runtime, it is no longer readonly and we need to
7226 avoid MEM_READONLY_P being set on RTL created for it. */
7228 {
7232 }
7236 /* Likewise if it needs destruction. */
7239 }
7243 /* Check for abstractness of the type. Notice that there is no
7244 need to strip array types here since the check for those types
7245 is already done within create_array_type_for_decl. */
7249 /* No initialization required. */
7250 ;
7252 {
7254 {
7256 {
7257 /* An out-of-class default definition is defined at
7258 the point where it is explicitly defaulted. */
7263 }
7264 else
7266 }
7267 /* else no initialization required. */
7268 }
7272 {
7275 }
7276 /* A variable definition. */
7278 /* Initialize the local variable. */
7281 /* If a variable is defined, and then a subsequent
7282 definition with external linkage is encountered, we will
7283 get here twice for the same variable. We want to avoid
7284 calling expand_static_init more than once. For variables
7285 that are not static data members, we can call
7286 expand_static_init only when we actually process the
7287 initializer. It is not legal to redeclare a static data
7288 member, so this issue does not arise in that case. */
7291 }
7293 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
7294 reference, insert it in the statement-tree now. */
7296 {
7301 }
7307 }
7309 /* For class TYPE return itself or some its bases that contain
7310 any direct non-static data members. Return error_mark_node if an
7311 error has been diagnosed. */
7313 static tree
7315 {
7325 {
7329 else
7334 }
7336 {
7344 }
7345 else
7355 {
7360 {
7362 {
7367 }
7371 {
7373 "classes %qT and %qT have non-static data "
7376 }
7377 else
7379 }
7380 }
7382 }
7384 /* Return std::tuple_size<TYPE>::value. */
7386 static tree
7388 {
7404 else
7406 }
7408 /* Return std::tuple_element<I,TYPE>::type. */
7410 static tree
7412 {
7420 tf_warning_or_error);
7423 }
7425 /* Return e.get<i>() or get<i>(e). */
7427 static tree
7429 {
7437 /* [The id-expression] e is an lvalue if the type of the entity e is an
7438 lvalue reference and an xvalue otherwise. */
7447 /* To use a member get, member lookup must find at least one
7448 declaration that is a function template
7449 whose first template parameter is a non-type parameter. */
7451 {
7454 {
7458 {
7461 }
7462 }
7463 }
7466 {
7471 }
7472 else
7473 {
7479 }
7480 }
7482 /* It's impossible to recover the decltype of a tuple decomposition variable
7483 based on the actual type of the variable, so store it in a hash table. */
7486 static void
7488 {
7492 }
7494 tree
7496 {
7498 }
7500 /* Mangle a decomposition declaration if needed. Arguments like
7501 in cp_finish_decomp. */
7503 void
7505 {
7509 {
7517 }
7518 }
7520 /* Finish a decomposition declaration. DECL is the underlying declaration
7521 "e", FIRST is the head of a chain of decls for the individual identifiers
7522 chained through DECL_CHAIN in reverse order and COUNT is the number of
7523 those decls. */
7525 void
7527 {
7529 {
7530 error_out:
7532 {
7535 {
7538 }
7540 }
7544 }
7548 /* This happens for range for when not in templates.
7549 Still add the DECL_VALUE_EXPRs for later processing. */
7550 || (!processing_template_decl
7552 {
7554 {
7556 {
7562 }
7566 }
7568 }
7574 {
7577 }
7583 {
7589 {
7591 type);
7593 }
7594 }
7599 {
7600 tree nelts;
7605 {
7608 }
7611 {
7612 cnt_mismatch:
7617 else
7626 }
7629 {
7637 NULL_TREE);
7640 }
7641 }
7642 /* 2 GNU extensions. */
7644 {
7650 {
7658 t);
7661 }
7662 }
7664 {
7666 {
7669 }
7674 {
7684 NULL_TREE);
7687 }
7688 }
7690 {
7692 {
7696 }
7698 {
7705 }
7711 {
7722 {
7726 }
7727 /* Save the decltype away before reference collapse. */
7733 {
7734 /* In this case the names are variables, not just proxies. */
7737 }
7741 }
7742 /* Ignore reads from the underlying decl performed during initialization
7743 of the individual variables. If those will be read, we'll mark
7744 the underlying decl as read at that point. */
7746 }
7748 {
7751 }
7753 {
7756 }
7758 {
7761 }
7764 type);
7765 else
7766 {
7771 {
7775 }
7781 else
7782 eltscnt++;
7787 {
7791 }
7798 else
7799 {
7801 NULL_TREE);
7807 {
7810 }
7811 i++;
7812 }
7813 }
7815 {
7818 {
7823 }
7824 }
7825 }
7827 /* Returns a declaration for a VAR_DECL as if:
7829 extern "C" TYPE NAME;
7831 had been seen. Used to create compiler-generated global
7832 variables. */
7834 static tree
7836 {
7837 tree decl;
7845 /* If the user has explicitly declared this variable (perhaps
7846 because the code we are compiling is part of a low-level runtime
7847 library), then it is possible that our declaration will be merged
7848 with theirs by pushdecl. */
7854 }
7856 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
7857 if "__cxa_atexit" is not being used) corresponding to the function
7858 to be called when the program exits. */
7860 static tree
7862 {
7863 tree fn_type;
7866 {
7867 tree arg_type;
7870 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
7872 else
7873 /* The parameter to "atexit" is "void (*)(void)". */
7879 }
7882 }
7884 /* Returns a pointer to the `atexit' function. Note that if
7885 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
7886 `__cxa_atexit' function specified in the IA64 C++ ABI. */
7888 static tree
7890 {
7891 tree atexit_fndecl;
7892 tree fn_type;
7893 tree fn_ptr_type;
7901 {
7902 /* The declaration for `__cxa_atexit' is:
7904 int __cxa_atexit (void (*)(void *), void *, void *)
7906 We build up the argument types and then the function type
7907 itself. */
7911 /* First, build the pointer-to-function type for the first
7912 argument. */
7914 /* Then, build the rest of the argument types. */
7917 {
7920 }
7921 else
7922 {
7925 }
7926 /* And the final __cxa_atexit type. */
7929 NULL_TREE);
7932 else
7934 }
7935 else
7936 {
7937 /* The declaration for `atexit' is:
7939 int atexit (void (*)());
7941 We build up the argument types and then the function type
7942 itself. */
7944 /* Build the final atexit type. */
7948 }
7950 /* Now, build the function declaration. */
7958 }
7960 /* Like get_atexit_node, but for thread-local cleanups. */
7962 static tree
7964 {
7965 /* The declaration for `__cxa_thread_atexit' is:
7967 int __cxa_thread_atexit (void (*)(void *), void *, void *) */
7971 NULL_TREE);
7973 /* Now, build the function declaration. */
7977 }
7979 /* Returns the __dso_handle VAR_DECL. */
7981 static tree
7983 {
7987 /* Declare the variable. */
7989 ptr_type_node);
7991 #ifdef HAVE_GAS_HIDDEN
7993 {
7996 }
7997 #endif
8000 }
8002 /* Begin a new function with internal linkage whose job will be simply
8003 to destroy some particular variable. */
8007 static tree
8009 {
8011 tree fntype;
8012 tree fndecl;
8018 /* No need to mangle this. */
8021 /* Build the name of the function. */
8023 /* Build the function declaration. */
8026 /* It's a function with internal linkage, generated by the
8027 compiler. */
8030 /* Make the function `inline' so that it is only emitted if it is
8031 actually needed. It is unlikely that it will be inlined, since
8032 it is only called via a function pointer, but we avoid unnecessary
8033 emissions this way. */
8036 /* Build the parameter. */
8038 {
8043 }
8051 }
8053 /* Finish the cleanup function begun by start_cleanup_fn. */
8055 static void
8057 {
8061 }
8063 /* Generate code to handle the destruction of DECL, an object with
8064 static storage duration. */
8066 tree
8068 {
8069 tree cleanup;
8070 tree addr;
8071 tree compound_stmt;
8072 tree fcall;
8073 tree type;
8076 tree atex_node;
8082 /* If we're using "__cxa_atexit" (or "__cxa_thread_atexit" or
8083 "__aeabi_atexit"), and DECL is a class object, we can just pass the
8084 destructor to "__cxa_atexit"; we don't have to build a temporary
8085 function to do the cleanup. */
8086 dso_parm = (flag_use_cxa_atexit
8091 {
8094 /* Make sure it is accessible. */
8096 tf_warning_or_error);
8097 }
8098 else
8099 {
8100 /* Call build_cleanup before we enter the anonymous function so
8101 that any access checks will be done relative to the current
8102 scope, rather than the scope of the anonymous function. */
8105 /* Now start the function. */
8108 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
8109 to the original function, rather than the anonymous one. That
8110 will make the back end think that nested functions are in use,
8111 which causes confusion. */
8116 /* Create the body of the anonymous function. */
8121 }
8123 /* Call atexit with the cleanup function. */
8129 else
8133 {
8134 /* We must convert CLEANUP to the type that "__cxa_atexit"
8135 expects. */
8137 /* "__cxa_atexit" will pass the address of DECL to the
8138 cleanup function. */
8141 /* The declared type of the parameter to "__cxa_atexit" is
8142 "void *". For plain "T*", we could just let the
8143 machinery in cp_build_function_call convert it -- but if the
8144 type is "cv-qualified T *", then we need to convert it
8145 before passing it in, to avoid spurious errors. */
8147 }
8148 else
8149 /* Since the cleanup functions we build ignore the address
8150 they're given, there's no reason to pass the actual address
8151 in, and, in general, it's cheaper to pass NULL than any
8152 other value. */
8157 tf_warning_or_error);
8159 /* Just pass NULL to the dso handle parm if we don't actually
8160 have a DSO handle on this target. */
8162 else
8166 {
8169 {
8172 }
8173 else
8174 {
8177 }
8178 }
8179 else
8180 {
8183 }
8186 }
8188 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
8189 is its initializer. Generate code to handle the construction
8190 and destruction of DECL. */
8192 static void
8194 {
8198 /* Some variables require no dynamic initialization. */
8200 {
8201 /* Make sure the destructor is callable. */
8205 }
8209 {
8213 else
8218 {
8220 "C++11 %<thread_local%> allows dynamic initialization "
8223 }
8225 }
8228 {
8229 /* Emit code to perform this initialization but once. */
8234 /* We don't need thread-safety code for thread-local vars. */
8238 /* Emit code to perform this initialization but once. This code
8239 looks like:
8241 static <type> guard;
8242 if (!__atomic_load (guard.first_byte)) {
8243 if (__cxa_guard_acquire (&guard)) {
8244 bool flag = false;
8245 try {
8246 // Do initialization.
8247 flag = true; __cxa_guard_release (&guard);
8248 // Register variable for destruction at end of program.
8249 } catch {
8250 if (!flag) __cxa_guard_abort (&guard);
8251 }
8252 }
8253 }
8255 Note that the `flag' variable is only set to 1 *after* the
8256 initialization is complete. This ensures that an exception,
8257 thrown during the construction, will cause the variable to
8258 reinitialized when we pass through this code again, as per:
8260 [stmt.dcl]
8262 If the initialization exits by throwing an exception, the
8263 initialization is not complete, so it will be tried again
8264 the next time control enters the declaration.
8266 This process should be thread-safe, too; multiple threads
8267 should not be able to initialize the variable more than
8268 once. */
8270 /* Create the guard variable. */
8273 /* Begin the conditional initialization. */
8280 {
8293 acquire_fn = push_library_fn
8296 NULL_TREE),
8301 NULL_TREE);
8311 inner_if_stmt);
8319 void_node,
8323 /* Do the initialization itself. */
8325 init = add_stmt_to_compound
8327 init = add_stmt_to_compound
8329 }
8330 else
8333 /* Use atexit to register a function for destroying this static
8334 variable. */
8340 {
8344 }
8349 }
8352 else
8354 }
8356 \f
8357 /* Make TYPE a complete type based on INITIAL_VALUE.
8358 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
8359 2 if there was no information (in which case assume 0 if DO_DEFAULT),
8360 3 if the initializer list is empty (in pedantic mode). */
8362 int
8364 {
8368 /* Don't get confused by a CONSTRUCTOR for some other type. */
8375 {
8377 tree value;
8379 /* An array of character type can be initialized from a
8380 brace-enclosed string constant.
8382 FIXME: this code is duplicated from reshape_init. Probably
8383 we should just call reshape_init here? */
8387 {
8394 }
8396 /* If any of the elements are parameter packs, we can't actually
8397 complete this type now because the array size is dependent. */
8399 {
8402 {
8405 }
8406 }
8407 }
8411 /* We can create the array before the element type is complete, which
8412 means that we didn't have these two bits set in the original type
8413 either. In completing the type, we are expected to propagate these
8414 bits. See also complete_type which does the same thing for arrays
8415 of fixed size. */
8418 {
8423 }
8426 }
8428 /* As above, but either give an error or reject zero-size arrays, depending
8429 on COMPLAIN. */
8431 int
8434 {
8437 /* In SFINAE context we can't be lenient about zero-size arrays. */
8444 {
8450 {
8453 }
8457 }
8459 }
8460 \f
8461 /* Return zero if something is declared to be a member of type
8462 CTYPE when in the context of CUR_TYPE. STRING is the error
8463 message to print in that case. Otherwise, quietly return 1. */
8465 static int
8467 {
8469 {
8472 else
8475 }
8477 }
8478 \f
8479 /* Subroutine of `grokdeclarator'. */
8481 /* Generate errors possibly applicable for a given set of specifiers.
8482 This is for ARM $7.1.2. */
8484 static void
8492 {
8494 {
8531 }
8535 && !flag_noexcept_type
8541 }
8543 /* DECL is a member function or static data member and is presently
8544 being defined. Check that the definition is taking place in a
8545 valid namespace. */
8547 static void
8549 {
8550 /* These checks only apply to member functions and static data
8551 members. */
8553 /* We check for problems with specializations in pt.c in
8554 check_specialization_namespace, where we can issue better
8555 diagnostics. */
8558 /* We check this in check_explicit_instantiation_namespace. */
8561 /* [class.mfct]
8563 A member function definition that appears outside of the
8564 class definition shall appear in a namespace scope enclosing
8565 the class definition.
8567 [class.static.data]
8569 The definition for a static data member shall appear in a
8570 namespace scope enclosing the member's class definition. */
8574 }
8576 /* Build a PARM_DECL for the "this" parameter of FN. TYPE is the
8577 METHOD_TYPE for a non-static member function; QUALS are the
8578 cv-qualifiers that apply to the function. */
8580 tree
8582 {
8583 tree this_type;
8584 tree qual_type;
8585 tree parm;
8586 cp_cv_quals this_quals;
8589 {
8590 this_type
8593 }
8594 else
8596 /* The `this' parameter is implicitly `const'; it cannot be
8597 assigned to. */
8603 }
8605 /* DECL is a static member function. Complain if it was declared
8606 with function-cv-quals. */
8608 static void
8610 {
8613 decl);
8614 }
8616 // Check that FN takes no arguments and returns bool.
8617 static void
8619 {
8620 // A constraint is nullary.
8624 // The declared return type of the concept shall be bool, and
8625 // it shall not be deduced from it definition.
8631 }
8633 /* Helper function. Replace the temporary this parameter injected
8634 during cp_finish_omp_declare_simd with the real this parameter. */
8636 static tree
8638 {
8647 }
8649 /* CTYPE is class type, or null if non-class.
8650 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
8651 or METHOD_TYPE.
8652 DECLARATOR is the function's name.
8653 PARMS is a chain of PARM_DECLs for the function.
8654 VIRTUALP is truthvalue of whether the function is virtual or not.
8655 FLAGS are to be passed through to `grokclassfn'.
8656 QUALS are qualifiers indicating whether the function is `const'
8657 or `volatile'.
8658 RAISES is a list of exceptions that this function can raise.
8659 CHECK is 1 if we must find this method in CTYPE, 0 if we should
8660 not look, and -1 if we should not call `grokclassfn' at all.
8662 SFK is the kind of special function (if any) for the new function.
8664 Returns `NULL_TREE' if something goes wrong, after issuing
8665 applicable error messages. */
8667 static tree
8669 tree type,
8670 tree declarator,
8671 tree parms,
8672 tree orig_declarator,
8673 tree decl_reqs,
8676 cp_cv_quals quals,
8677 cp_ref_qualifier rqual,
8678 tree raises,
8684 special_function_kind sfk,
8687 tree in_namespace,
8689 location_t location)
8690 {
8691 tree decl;
8693 tree t;
8695 // Was the concept specifier present?
8698 // Concept declarations must have a corresponding definition.
8700 {
8703 }
8712 /* Set the constraints on the declaration. */
8714 {
8719 /* Adjust the required expression into a constraint. */
8725 }
8727 /* If we have an explicit location, use it, otherwise use whatever
8728 build_lang_decl used (probably input_location). */
8733 {
8738 /* Allocate space to hold the vptr bit if needed. */
8740 }
8746 /* Propagate volatile out from type to decl. */
8750 /* Setup decl according to sfk. */
8752 {
8765 }
8768 {
8771 orig_declarator);
8772 else
8773 {
8778 {
8779 /* Something like `template <class T> friend void f<T>()'. */
8782 orig_declarator);
8784 }
8787 /* A friend declaration of the form friend void f<>(). Record
8788 the information in the TEMPLATE_ID_EXPR. */
8797 {
8800 decl);
8802 }
8805 {
8808 decl);
8810 }
8811 }
8812 }
8814 /* If this decl has namespace scope, set that up. */
8820 /* `main' and builtins have implicit 'C' linkage. */
8835 /* Should probably propagate const out from type to decl I bet (mrs). */
8837 {
8840 }
8846 {
8850 }
8853 {
8864 }
8866 /* Members of anonymous types and local classes have no linkage; make
8867 them internal. If a typedef is made later, this will be changed. */
8873 {
8874 /* [basic.link]: A name with no linkage (notably, the name of a class
8875 or enumeration declared in a local scope) shall not be used to
8876 declare an entity with linkage.
8878 DR 757 relaxes this restriction for C++0x. */
8880 }
8884 {
8887 }
8889 /* If the declaration was declared inline, mark it as such. */
8891 {
8895 }
8899 // If the concept declaration specifier was found, check
8900 // that the declaration satisfies the necessary requirements.
8902 {
8905 }
8909 {
8912 TYPE_UNQUALIFIED,
8913 REF_QUAL_NONE);
8916 {
8920 decl);
8922 }
8925 {
8929 decl);
8931 }
8932 }
8935 {
8937 {
8941 }
8945 }
8950 {
8954 /* [over.literal]/6: Literal operators shall not have C linkage. */
8956 {
8960 }
8963 {
8966 {
8969 }
8973 {
8977 }
8979 {
8983 }
8984 /* 17.6.3.3.5 */
8989 "literal operator suffixes not preceded by %<_%>"
8991 }
8992 else
8993 {
8996 }
8997 }
9000 /* Make the init_value nonzero so pushdecl knows this is not
9001 tentative. error_mark_node is replaced later with the BLOCK. */
9008 {
9009 /* Adjust "omp declare simd" attributes. */
9012 {
9013 tree attr;
9016 {
9021 {
9023 cl = c_omp_declare_simd_clauses_to_numbers
9027 else
9029 }
9030 }
9031 }
9032 }
9034 /* Caller will do the rest of this. */
9041 /* 12.4/3 */
9049 template_count,
9061 {
9064 }
9066 /* Check main's type after attributes have been applied. */
9068 {
9070 integer_type_node))
9071 {
9073 tree newtype;
9077 }
9080 }
9083 {
9085 (processing_template_decl
9087 ? current_template_parms
9094 {
9095 tree ok;
9096 tree pushed_scope;
9099 /* Because grokfndecl is always supposed to return a
9100 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
9101 here. We depend on our callers to figure out that its
9102 really a template that's being returned. */
9107 {
9108 /* Remove the `this' parm added by grokclassfn. */
9111 }
9113 {
9116 }
9118 {
9123 }
9125 /* Since we've smashed OLD_DECL to its
9126 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
9130 /* Attempt to merge the declarations. This can fail, in
9131 the case of some invalid specialization declarations. */
9137 {
9141 }
9145 }
9146 }
9158 }
9160 /* decl is a FUNCTION_DECL.
9161 specifiers are the parsed virt-specifiers.
9163 Set flags to reflect the virt-specifiers.
9165 Returns decl. */
9167 static tree
9169 {
9177 }
9179 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
9180 the linkage that DECL will receive in the object file. */
9182 static void
9184 {
9185 /* A static data member always has static storage duration and
9186 external linkage. Note that static data members are forbidden in
9187 local classes -- the only situation in which a class has
9188 non-external linkage. */
9191 /* For non-template classes, static data members are always put
9192 out in exactly those files where they are defined, just as
9193 with ordinary namespace-scope variables. */
9196 }
9198 /* Create a VAR_DECL named NAME with the indicated TYPE.
9200 If SCOPE is non-NULL, it is the class type or namespace containing
9201 the variable. If SCOPE is NULL, the variable should is created in
9202 the innermost enclosing scope. */
9204 static tree
9206 tree name,
9207 tree orig_declarator,
9214 tree scope)
9215 {
9216 tree decl;
9217 tree explicit_scope;
9224 /* Compute the scope in which to place the variable, but remember
9225 whether or not that scope was explicitly specified by the user. */
9228 {
9229 /* An explicit "extern" specifier indicates a namespace-scope
9230 variable. */
9235 }
9239 template, we need DECL_LANG_SPECIFIC. */
9241 /* Similarly for namespace-scope variables with language linkage
9242 other than C++. */
9245 /* Similarly for static data members. */
9247 /* Similarly for explicit specializations. */
9248 || (orig_declarator
9251 else
9256 else
9260 {
9263 }
9266 {
9268 /* This function is only called with out-of-class definitions. */
9271 }
9272 /* At top level, either `static' or no s.c. makes a definition
9273 (perhaps tentative), and absence of `static' makes it public. */
9275 {
9278 || ! constp
9279 || volatilep
9282 }
9283 /* Not at top level, only `static' makes a static definition. */
9284 else
9285 {
9288 }
9291 {
9293 {
9297 }
9300 }
9302 /* If the type of the decl has no linkage, make sure that we'll
9303 notice that in mark_used. */
9312 {
9313 /* [basic.link]: A name with no linkage (notably, the name of a class
9314 or enumeration declared in a local scope) shall not be used to
9315 declare an entity with linkage.
9317 DR 757 relaxes this restriction for C++0x. */
9320 }
9321 else
9329 /* Check that the variable can be safely declared as a concept.
9330 Note that this also forbids explicit specializations. */
9332 {
9334 {
9337 }
9338 else
9343 }
9346 {
9350 }
9352 // Handle explicit specializations and instantiations of variable templates.
9358 }
9360 /* Create and return a canonical pointer to member function type, for
9361 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
9363 tree
9365 {
9367 tree t;
9372 /* Make sure that we always have the unqualified pointer-to-member
9373 type first. */
9375 {
9378 }
9380 /* If a canonical type already exists for this type, use it. We use
9381 this method instead of type_hash_canon, because it only does a
9382 simple equality check on the list of field members. */
9390 /* Let the front end know this is a pointer to member function. */
9397 delta_type_node);
9403 /* Zap out the name so that the back end will give us the debugging
9404 information for this anonymous RECORD_TYPE. */
9407 /* Cache this pointer-to-member type so that we can find it again
9408 later. */
9417 }
9419 /* Create and return a pointer to data member type. */
9421 tree
9423 {
9425 {
9430 }
9431 else
9432 {
9435 }
9436 }
9438 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
9439 Check to see that the definition is valid. Issue appropriate error
9440 messages. Return 1 if the definition is particularly bad, or 0
9441 otherwise. */
9443 static int
9445 {
9446 /* Avoid redundant diagnostics on out-of-class definitions. */
9449 /* Can't check yet if we don't know the type. */
9452 /* If DECL is declared constexpr, we'll do the appropriate checks
9453 in check_initializer. Similarly for inline static data members. */
9459 {
9462 "in-class initialization of static data member %q#D of "
9466 "%<constexpr%> needed for in-class initialization of "
9468 else
9470 "in-class initialization of static data member %q#D of "
9473 }
9475 /* Motion 10 at San Diego: If a static const integral data member is
9476 initialized with an integral constant expression, the initializer
9477 may appear either in the declaration (within the class), or in
9478 the definition, but not both. If it appears in the class, the
9479 member is a member constant. The file-scope definition is always
9480 required. */
9482 {
9484 "invalid in-class initialization of static data member "
9486 type);
9488 }
9491 "ISO C++ forbids in-class initialization of non-const "
9493 decl);
9496 "ISO C++ forbids initialization of member constant "
9500 }
9502 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
9503 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
9504 expressions out into temporary variables so that walk_tree doesn't
9505 step into them (c++/15764). */
9507 static tree
9509 {
9513 {
9519 }
9523 }
9525 /* Entry point for the above. */
9527 static void
9529 {
9531 /* Break out any function calls into temporary variables. */
9533 }
9535 /* Reduce a SIZEOF_EXPR to its value. */
9537 tree
9539 {
9540 tree r;
9547 else
9553 }
9555 /* Given the SIZE (i.e., number of elements) in an array, compute
9556 an appropriate index type for the array. If non-NULL, NAME is
9557 the name of the entity being declared. */
9559 tree
9561 {
9562 tree itype;
9569 {
9574 /* In C++98, we mark a non-constant array bound with a magic
9576 else
9577 {
9584 }
9589 /* The array bound must be an integer type. */
9592 {
9597 else
9600 }
9601 }
9603 /* A type is dependent if it is...an array type constructed from any
9604 dependent type or whose size is specified by a constant expression
9605 that is value-dependent. */
9606 /* We can only call value_dependent_expression_p on integral constant
9607 expressions; treat non-constant expressions as dependent, too. */
9611 {
9612 /* We cannot do any checking for a SIZE that isn't known to be
9613 constant. Just build the index type and mark that it requires
9614 structural equality checks. */
9621 }
9624 {
9629 /* Use the folded result for VLAs, too; it will have resolved
9630 SIZEOF_EXPR. */
9632 }
9634 /* Normally, the array-bound will be a constant. */
9636 {
9637 /* An array must have a positive number of elements. */
9639 {
9645 else
9648 }
9649 /* As an extension we allow zero-sized arrays. */
9651 {
9653 /* We must fail if performing argument deduction (as
9654 indicated by the state of complain), so that
9655 another substitution can be found. */
9661 else
9663 }
9664 }
9666 /* We don't allow VLAs at non-function scopes, or during
9667 tentative template substitution. */
9670 {
9673 /* `(int) &fn' is not a valid array bound. */
9676 name);
9677 else
9680 }
9682 {
9685 else
9687 }
9689 {
9693 else
9696 }
9699 /* A variable sized array. */
9701 else
9702 {
9703 /* Compute the index of the largest element in the array. It is
9704 one less than the number of elements in the array. We save
9705 and restore PROCESSING_TEMPLATE_DECL so that computations in
9706 cp_build_binary_op will be appropriately folded. */
9707 {
9708 processing_template_decl_sentinel s;
9710 MINUS_EXPR,
9713 complain),
9714 complain);
9716 }
9719 {
9720 /* A variable sized array. */
9727 {
9728 /* We have to add 1 -- in the ubsan routine we generate
9729 LE_EXPR rather than LT_EXPR. */
9734 }
9735 }
9736 /* Make sure that there was no overflow when creating to a signed
9737 index type. (For example, on a 32-bit machine, an array with
9738 size 2^32 - 1 is too big.) */
9741 {
9746 }
9747 }
9749 /* Create and return the appropriate index type. */
9752 /* If the index type were dependent, we would have returned early, so
9753 remember that it isn't. */
9757 }
9759 /* Returns the scope (if any) in which the entity declared by
9760 DECLARATOR will be located. If the entity was declared with an
9761 unqualified name, NULL_TREE is returned. */
9763 tree
9765 {
9769 /* If the declarator-id is a SCOPE_REF, the scope in which the
9770 declaration occurs is the first operand. */
9775 /* Otherwise, the declarator is not a qualified name; the entity will
9776 be declared in the current scope. */
9778 }
9780 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
9781 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
9782 with this type. */
9784 static tree
9786 {
9789 /* If things have already gone awry, bail now. */
9793 /* 8.3.4/1: If the type of the identifier of D contains the auto
9794 type-specifier, the program is ill-formed. */
9796 {
9799 }
9801 /* If there are some types which cannot be array elements,
9802 issue an error-message and return. */
9804 {
9808 else
9815 else
9822 else
9829 else
9835 }
9837 /* [dcl.array]
9839 The constant expressions that specify the bounds of the arrays
9840 can be omitted only for the first member of the sequence. */
9842 {
9846 name);
9847 else
9852 }
9854 /* Figure out the index type for the array. */
9858 /* [dcl.array]
9859 T is called the array element type; this type shall not be [...] an
9860 abstract class type. */
9864 }
9866 /* Returns the smallest location != UNKNOWN_LOCATION among the
9867 three stored in LOCATIONS[ds_const], LOCATIONS[ds_volatile],
9868 and LOCATIONS[ds_restrict]. */
9870 static location_t
9872 {
9887 }
9889 /* Check that it's OK to declare a function with the indicated TYPE
9890 and TYPE_QUALS. SFK indicates the kind of special function (if any)
9891 that this function is. OPTYPE is the type given in a conversion
9892 operator declaration, or the class type for a constructor/destructor.
9893 Returns the actual return type of the function; that may be different
9894 than TYPE if an error occurs, or for certain special functions. */
9896 static tree
9898 tree type,
9899 tree optype,
9902 {
9904 {
9914 else
9925 /* We can't use the proper return type here because we run into
9926 problems with ambiguous bases and covariant returns. */
9929 else
9938 "qualifiers are not allowed on declaration of "
9949 "qualifiers are not allowed on declaration of "
9952 {
9956 }
9957 else
9967 }
9970 }
9972 /* A variable or data member (whose unqualified name is IDENTIFIER)
9973 has been declared with the indicated TYPE. If the TYPE is not
9974 acceptable, issue an error message and return a type to use for
9975 error-recovery purposes. */
9977 tree
9979 {
9981 {
9985 {
9988 }
9989 else
9992 }
9995 }
9997 /* Handle declaring DECL as an inline variable. */
9999 static void
10001 {
10004 {
10008 }
10011 "inline variables are only available "
10014 {
10017 }
10018 }
10021 /* Assign a typedef-given name to a class or enumeration type declared
10022 as anonymous at first. This was split out of grokdeclarator
10023 because it is also used in libcc1. */
10025 void
10027 {
10030 /* Replace the anonymous name with the real name everywhere. */
10032 {
10034 /* We do not rename the debug info representing the
10035 unnamed tagged type because the standard says in
10036 [dcl.typedef] that the naming applies only for
10037 linkage purposes. */
10038 /*debug_hooks->set_name (t, decl);*/
10040 }
10045 /* If this is a typedef within a template class, the nested
10046 type is a (non-primary) template. The name for the
10047 template needs updating as well. */
10052 /* Adjust linkage now that we aren't unnamed anymore. */
10055 /* FIXME remangle member functions; member functions of a
10056 type with external linkage have external linkage. */
10058 /* Check that our job is done, and that it would fail if we
10059 attempted to do it again. */
10061 }
10063 /* Given declspecs and a declarator (abstract or otherwise), determine
10064 the name and type of the object declared and construct a DECL node
10065 for it.
10067 DECLSPECS points to the representation of declaration-specifier
10068 sequence that precedes declarator.
10070 DECL_CONTEXT says which syntactic context this declaration is in:
10071 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
10072 FUNCDEF for a function definition. Like NORMAL but a few different
10073 error messages in each case. Return value may be zero meaning
10074 this definition is too screwy to try to parse.
10075 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
10076 handle member functions (which have FIELD context).
10077 Return value may be zero meaning this definition is too screwy to
10078 try to parse.
10079 PARM for a parameter declaration (either within a function prototype
10080 or before a function body). Make a PARM_DECL, or return void_type_node.
10081 TPARM for a template parameter declaration.
10082 CATCHPARM for a parameter declaration before a catch clause.
10083 TYPENAME if for a typename (in a cast or sizeof).
10084 Don't make a DECL node; just return the ..._TYPE node.
10085 FIELD for a struct or union field; make a FIELD_DECL.
10086 BITFIELD for a field with specified width.
10088 INITIALIZED is as for start_decl.
10090 ATTRLIST is a pointer to the list of attributes, which may be NULL
10091 if there are none; *ATTRLIST may be modified if attributes from inside
10092 the declarator should be applied to the declaration.
10094 When this function is called, scoping variables (such as
10095 CURRENT_CLASS_TYPE) should reflect the scope in which the
10096 declaration occurs, not the scope in which the new declaration will
10097 be placed. For example, on:
10099 void S::f() { ... }
10101 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
10102 should not be `S'.
10104 Returns a DECL (if a declarator is present), a TYPE (if there is no
10105 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
10106 error occurs. */
10108 tree
10114 {
10126 /* True if this declarator is a function definition. */
10130 #if 0
10131 /* See the code below that used this. */
10133 #endif
10135 /* Keep track of what sort of function is being processed
10136 so that we can warn about default return values, or explicit
10137 return values which do not match prescribed defaults. */
10143 /* cv-qualifiers that apply to the declarator, for a declaration of
10144 a member function. */
10146 /* virt-specifiers that apply to the declarator, for a declaration of
10147 a member function. */
10149 /* ref-qualifier that applies to the declarator, for a declaration of
10150 a member function. */
10152 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
10159 /* The unqualified name of the declarator; either an
10160 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
10161 tree unqualified_id;
10162 /* The class type, if any, in which this entity is located,
10163 or NULL_TREE if none. Note that this value may be different from
10164 the current class type; for example if an attempt is made to declare
10165 "A::f" inside "B", this value will be "A". */
10167 /* The NAMESPACE_DECL for the namespace in which this entity is
10168 located. If an unqualified name is used to declare the entity,
10169 this value will be NULL_TREE, even if the entity is located at
10170 namespace scope. */
10172 cp_storage_class storage_class;
10193 // Was concept_p specified? Note that ds_concept
10194 // implies ds_constexpr!
10227 /* Look inside a declarator for the name being declared
10228 and get it as a string, for an error message. */
10230 id_declarator;
10232 {
10237 {
10241 {
10245 }
10249 {
10255 {
10257 {
10258 /* [dcl.meaning]
10260 A declarator-id shall not be qualified except
10261 for ...
10263 None of the cases are permitted in block
10264 scope. */
10267 decl);
10271 else
10275 }
10277 {
10280 {
10283 }
10285 && current_class_type
10287 current_class_type))
10288 {
10292 }
10293 }
10296 }
10298 {
10300 {
10302 {
10305 }
10308 {
10311 }
10318 }
10322 {
10328 }
10329 /* Fall through. */
10336 {
10338 dname);
10340 }
10343 else
10344 {
10351 else
10353 }
10358 }
10360 }
10377 }
10380 }
10382 /* [dcl.fct.edf]
10384 The declarator in a function-definition shall have the form
10385 D1 ( parameter-declaration-clause) ... */
10387 {
10390 }
10395 {
10398 }
10401 {
10404 {
10407 }
10410 {
10412 {
10415 }
10417 {
10420 }
10421 }
10422 }
10424 /* Anything declared one level down from the top level
10425 must be one of the parameters of a function
10426 (because the body is at least two levels down). */
10428 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
10429 by not allowing C++ class definitions to specify their parameters
10430 with xdecls (must be spec.d in the parmlist).
10432 Since we now wait to push a class scope until we are sure that
10433 we are in a legitimate method context, we must set oldcname
10434 explicitly (since current_class_name is not yet alive).
10436 We also want to avoid calling this a PARM if it is in a namespace. */
10439 {
10445 }
10451 {
10454 }
10457 {
10460 }
10462 /* If there were multiple types specified in the decl-specifier-seq,
10463 issue an error message. */
10465 {
10468 }
10471 {
10474 }
10476 /* Extract the basic type from the decl-specifier-seq. */
10479 {
10482 }
10483 /* If the entire declaration is itself tagged as deprecated then
10484 suppress reports of deprecated items. */
10489 {
10496 }
10497 /* No type at all: default to `int', and set DEFAULTED_INT
10498 because it was not a user-defined typedef. */
10500 {
10502 {
10503 /* These imply 'int'. */
10506 }
10507 /* If we just have "complex", it is equivalent to "complex double". */
10510 {
10513 "ISO C++ does not support plain %<complex%> meaning "
10515 }
10516 }
10517 /* Gather flags. */
10521 #if 0
10522 /* See the code below that used this. */
10525 #endif
10530 else
10534 {
10536 ctor_return_type,
10537 type_quals,
10540 }
10542 {
10547 /* We handle `main' specially here, because 'main () { }' is so
10548 common. With no options, it is allowed. With -Wreturn-type,
10549 it is a warning. It is only an error with -pedantic-errors. */
10550 is_main = (funcdef_flag
10566 else
10571 /* FIXME we should be able to propagate the error_mark_node as is
10572 for other contexts too. */
10574 else
10576 }
10581 {
10583 {
10587 }
10592 }
10594 /* Now process the modifiers that were specified
10595 and check for invalid combinations. */
10597 /* Long double is a special combination. */
10599 {
10603 }
10605 /* Check all other uses of type modifiers. */
10608 {
10630 {
10635 }
10636 else
10637 {
10640 {
10643 name);
10646 }
10647 }
10649 /* Discard the type modifiers if they are invalid. */
10651 {
10657 }
10658 }
10660 /* Decide whether an integer type is signed or not.
10661 Optionally treat bitfields as signed by default. */
10663 /* [class.bit]
10665 It is implementation-defined whether a plain (neither
10666 explicitly signed or unsigned) char, short, int, or long
10667 bit-field is signed or unsigned.
10669 Naturally, we extend this to long long as well. Note that
10670 this does not include wchar_t. */
10672 && !signed_p
10673 /* A typedef for plain `int' without `signed' can be
10674 controlled just like plain `int', but a typedef for
10675 `signed int' cannot be so controlled. */
10676 && !(typedef_decl
10680 {
10693 else
10695 }
10708 {
10711 /* If a modifier is specified, the resulting complex is the complex
10712 form of TYPE. E.g, "complex short" is "complex short int". */
10721 else
10723 }
10725 /* If we're using the injected-class-name to form a compound type or a
10726 declaration, replace it with the underlying class so we don't get
10727 redundant typedefs in the debug output. But if we are returning the
10728 type unchanged, leave it alone so that it's available to
10729 maybe_get_template_decl_from_type_decl. */
10737 type = cp_build_qualified_type_real
10741 /* We might have ignored or rejected some of the qualifiers. */
10748 {
10752 }
10764 {
10766 {
10771 }
10775 }
10778 /* Issue errors about use of storage classes for parameters. */
10780 {
10782 {
10785 }
10787 {
10790 }
10796 /* Function parameters cannot be concept. */
10799 /* Function parameters cannot be constexpr. If we saw one, moan
10800 and pretend it wasn't there. */
10802 {
10805 }
10806 }
10808 /* Give error if `virtual' is used outside of class declaration. */
10811 {
10815 }
10818 {
10833 declspecs->gnu_thread_keyword_p
10839 {
10864 }
10867 {
10869 {
10873 "type must be cv-qualified %<auto%> or reference to "
10875 }
10878 }
10888 }
10890 /* Static anonymous unions are dealt with here. */
10896 /* Warn about storage classes that are invalid for certain
10897 kinds of declarations (parameters, typenames, etc.). */
10899 && ((storage_class
10903 {
10906 }
10911 {
10915 ;
10917 ;
10919 /* C++ allows static class elements. */
10921 /* C++ also allows inlines and signed and unsigned elements,
10922 but in those cases we don't come in here. */
10923 ;
10924 else
10925 {
10928 else
10929 {
10932 else
10934 }
10940 }
10941 }
10946 {
10949 }
10953 {
10958 /* When thread_local is applied to a variable of block scope the
10959 storage-class-specifier static is implied if it does not appear
10960 explicitly. */
10963 }
10966 {
10970 }
10974 else
10975 {
10978 {
10991 }
10992 }
10995 {
11000 }
11002 /* Determine the type of the entity declared by recurring on the
11003 declarator. */
11005 {
11007 tree attrs;
11014 {
11026 attr_flags);
11027 }
11031 /* We don't want to warn in parameter context because we don't
11032 yet know if the parse will succeed, and this might turn out
11033 to be a constructor call. */
11036 && !typedef_p
11038 /* If the type is class-like and the inner name used a
11039 global namespace qualifier, we need the parens.
11040 Unfortunately all we can tell is whether a qualified name
11041 was used or not. */
11042 && !(inner_declarator
11053 {
11061 /* [dcl.array]/1:
11063 The optional attribute-specifier-seq appertains to the
11064 array. */
11070 {
11071 tree arg_types;
11074 /* Declaring a function type. */
11080 /* Pick up type qualifiers which should be applied to `this'. */
11082 /* Pick up virt-specifiers. */
11084 /* And ref-qualifier, too */
11086 /* And tx-qualifier. */
11088 /* Pick up the exception specifications. */
11090 /* If the exception-specification is ill-formed, let's pretend
11091 there wasn't one. */
11099 /* Say it's a definition only for the CALL_EXPR
11100 closest to the identifier. */
11103 /* Handle a late-specified return type. */
11106 {
11108 {
11110 {
11115 {
11117 "%<auto%> type specifier without trailing "
11120 "only available with -std=c++14 or "
11122 }
11124 {
11128 }
11129 }
11131 {
11136 }
11142 {
11144 {
11151 }
11153 {
11155 "for %qT must have trailing return "
11160 }
11166 else
11170 }
11171 }
11174 {
11176 /* Not using maybe_warn_cpp0x because this should
11177 always be an error. */
11180 else
11184 }
11185 }
11191 {
11194 }
11197 {
11201 /* We now know that the TYPE_QUALS don't apply to the
11202 decl, but to its return type. */
11204 }
11206 /* Error about some types functions can't return. */
11209 {
11213 }
11215 {
11219 }
11223 && funcdecl_p
11229 {
11230 /* We are within a class's scope. If our declarator name
11231 is the same as the class name, and we are defining
11232 a function, then it is a constructor/destructor, and
11233 therefore returns a void type. */
11235 /* ISO C++ 12.4/2. A destructor may not be declared
11236 const or volatile. A destructor may not be static.
11237 A destructor may not be declared with ref-qualifier.
11239 ISO C++ 12.1. A constructor may not be declared
11240 const or volatile. A constructor may not be
11241 virtual. A constructor may not be static.
11242 A constructor may not be declared with ref-qualifier. */
11248 {
11253 }
11256 {
11262 }
11266 current_class_type,
11267 flags))
11271 {
11272 /* It's a constructor. */
11276 {
11280 }
11284 }
11287 }
11289 {
11291 {
11292 /* Cannot be both friend and virtual. */
11295 }
11301 name);
11302 }
11304 {
11306 {
11309 }
11312 }
11314 {
11317 }
11324 pushed_scope
11336 {
11340 }
11346 {
11348 /* transaction_safe applies to the type, but
11349 transaction_safe_dynamic applies to the function. */
11352 else
11354 }
11356 /* [dcl.fct]/2:
11358 The optional attribute-specifier-seq appertains to
11359 the function type. */
11364 }
11370 /* Filter out pointers-to-references and references-to-references.
11371 We can get these if a TYPE_DECL is used. */
11374 {
11376 {
11379 }
11381 /* In C++0x, we allow reference to reference declarations
11382 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
11383 and template type arguments [14.3.1/4 temp.arg.type]. The
11384 check for direct reference to reference declarations, which
11385 are still forbidden, occurs below. Reasoning behind the change
11386 can be found in DR106, DR540, and the rvalue reference
11387 proposals. */
11389 {
11392 }
11393 }
11395 {
11400 }
11402 /* We now know that the TYPE_QUALS don't apply to the decl,
11403 but to the target of the pointer. */
11406 /* This code used to handle METHOD_TYPE, but I don't think it's
11407 possible to get it here anymore. */
11411 {
11415 memfn_quals,
11416 rqual);
11422 }
11430 type);
11432 /* When the pointed-to type involves components of variable size,
11433 care must be taken to ensure that the size evaluation code is
11434 emitted early enough to dominate all the possible later uses
11435 and late enough for the variables on which it depends to have
11436 been assigned.
11438 This is expected to happen automatically when the pointed-to
11439 type has a name/declaration of it's own, but special attention
11440 is required if the type is anonymous.
11442 We handle the NORMAL and FIELD contexts here by inserting a
11443 dummy statement that just evaluates the size at a safe point
11444 and ensures it is not deferred until e.g. within a deeper
11445 conditional context (c++/43555).
11447 We expect nothing to be needed here for PARM or TYPENAME.
11448 Evaluating the size at this point for TYPENAME would
11449 actually be incorrect, as we might be in the middle of an
11450 expression with side effects on the pointed-to type size
11451 "arguments" prior to the pointer declaration point and the
11452 size evaluation could end up prior to the side effects. */
11458 {
11462 }
11465 {
11466 /* In C++0x, the type we are creating a reference to might be
11467 a typedef which is itself a reference type. In that case,
11468 we follow the reference collapsing rules in
11469 [7.1.3/8 dcl.typedef] to create the final reference type:
11471 "If a typedef TD names a type that is a reference to a type
11472 T, an attempt to create the type 'lvalue reference to cv TD'
11473 creates the type 'lvalue reference to T,' while an attempt
11474 to create the type "rvalue reference to cv TD' creates the
11475 type TD."
11476 */
11480 {
11483 else
11485 }
11486 else
11487 type = cp_build_reference_type
11490 /* In C++0x, we need this check for direct reference to
11491 reference declarations, which are forbidden by
11492 [8.3.2/5 dcl.ref]. Reference to reference declarations
11493 are only allowed indirectly through typedefs and template
11494 type arguments. Example:
11496 void foo(int & &); // invalid ref-to-ref decl
11498 typedef int & int_ref;
11499 void foo(int_ref &); // valid ref-to-ref decl
11500 */
11504 }
11508 {
11512 /* We will already have complained. */
11514 else
11516 type);
11517 }
11518 else
11521 /* Process a list of type modifier keywords (such as
11522 const or volatile) that were given inside the `*' or `&'. */
11525 {
11526 type
11530 }
11532 /* Apply C++11 attributes to the pointer, and not to the
11533 type pointed to. This is unlike what is done for GNU
11534 attributes above. It is to comply with [dcl.ptr]/1:
11536 [the optional attribute-specifier-seq (7.6.1) appertains
11537 to the pointer and not to the object pointed to]. */
11550 }
11551 }
11553 /* A `constexpr' specifier used in an object declaration declares
11554 the object as `const'. */
11556 {
11557 /* DR1688 says that a `constexpr' specifier in combination with
11558 `volatile' is valid. */
11561 {
11564 }
11565 }
11571 {
11573 unqualified_id);
11575 }
11577 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
11578 qualified with a class-name, turn it into a METHOD_TYPE, unless
11579 we know that the function is static. We take advantage of this
11580 opportunity to do other processing that pertains to entities
11581 explicitly declared to be class members. Note that if DECLARATOR
11582 is non-NULL, we know it is a cdk_id declarator; otherwise, we
11583 would not have exited the loop above. */
11588 {
11594 {
11596 {
11600 }
11601 else
11605 }
11607 can skip the following checks. */
11610 qualifying type must certainly be complete. */
11611 funcdef_flag
11612 /* A friend declaration of "T::f" is OK, even if
11613 "T" is a template parameter. But, if this
11614 function is not a friend, the qualifying type
11615 must be a class. */
11617 /* For a declaration, the type need not be
11618 complete, if either it is dependent (since there
11619 is no meaningful definition of complete in that
11620 case) or the qualifying class is currently being
11621 defined. */
11624 /* Check that the qualifying type is complete. */
11628 {
11631 {
11639 }
11640 }
11642 {
11646 }
11647 }
11652 /* Now TYPE has the actual type. */
11655 {
11658 else
11660 }
11666 {
11667 /* [dcl.meaning]/1: The optional attribute-specifier-seq following
11668 a declarator-id appertains to the entity that is declared. */
11671 else
11672 /* We should have already diagnosed the issue (c++/78344). */
11674 }
11676 /* Handle parameter packs. */
11678 {
11680 /* Turn the type into a pack expansion.*/
11682 else
11684 }
11687 && !processing_template_decl
11689 {
11692 else
11695 }
11698 {
11699 /* [dcl.fct.spec] (C++11) The explicit specifier shall be used only
11700 in the declaration of a constructor or conversion function within
11701 a class definition. */
11708 else
11710 "only declarations of constructors and conversion operators "
11713 }
11716 {
11718 {
11721 }
11723 {
11726 }
11729 {
11732 }
11734 {
11737 }
11739 {
11742 }
11744 {
11748 }
11749 }
11751 /* If this is declaring a typedef name, return a TYPE_DECL. */
11753 {
11754 tree decl;
11756 /* This declaration:
11758 typedef void f(int) const;
11760 declares a function type which is not a member of any
11761 particular class, but which is cv-qualified; for
11762 example "f S::*" declares a pointer to a const-qualified
11763 member function of S. We record the cv-qualification in the
11764 function type. */
11766 {
11769 /* We have now dealt with these qualifiers. */
11772 }
11775 {
11778 }
11784 {
11787 }
11791 else
11795 {
11799 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
11801 /* The TYPE_DECL is "abstract" because there will be
11802 clones of this constructor/destructor, and there will
11803 be copies of this TYPE_DECL generated in those
11804 clones. The decloning optimization (for space) may
11805 revert this subsequently if it determines that
11806 the clones should share a common implementation. */
11808 }
11813 unqualified_id);
11815 /* If the user declares "typedef struct {...} foo" then the
11816 struct will have an anonymous name. Fill that name in now.
11817 Nothing can refer to it, so nothing needs know about the name
11818 change. */
11820 && unqualified_id
11838 /* Acknowledge that this was written:
11839 `using analias = atype;'. */
11843 }
11845 /* Detect the case of an array type of unspecified size
11846 which came, as such, direct from a typedef name.
11847 We must copy the type, so that the array's domain can be
11848 individually set by the object's initializer. */
11855 /* Detect where we're using a typedef of function type to declare a
11856 function. PARMS will not be set, so we must create it now. */
11859 {
11861 tree args;
11866 {
11872 }
11877 {
11878 /* The qualifiers on the function type become the qualifiers on
11879 the non-static member function. */
11883 }
11884 }
11886 /* If this is a type name (such as, in a cast or sizeof),
11887 compute the type and return it now. */
11890 {
11891 /* Note that here we don't care about type_quals. */
11893 /* Special case: "friend class foo" looks like a TYPENAME context. */
11895 {
11897 {
11900 }
11903 {
11904 /* Don't allow friend declaration without a class-key. */
11911 else
11914 type);
11915 }
11917 /* Only try to do this stuff if we didn't already give up. */
11919 {
11920 /* A friendly class? */
11924 else
11926 type);
11929 }
11930 }
11932 {
11939 /* Core issue #547: need to allow this in template type args.
11940 Allow it in general in C++11 for alias-declarations. */
11944 else
11946 }
11952 }
11956 && ! bitfield
11958 {
11961 }
11964 {
11965 /* Only functions may be declared using an operator-function-id. */
11967 {
11970 }
11975 type);
11976 }
11978 /* We don't check parameter types here because we can emit a better
11979 error message later. */
11981 {
11985 }
11987 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
11988 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
11991 {
11997 {
12000 else
12003 }
12005 /* A parameter declared as an array of T is really a pointer to T.
12006 One declared as a function is really a pointer to a function.
12007 One declared as a member is really a pointer to member. */
12010 {
12011 /* Transfer const-ness of array into that of type pointed to. */
12015 }
12018 }
12023 {
12029 }
12031 {
12035 {
12042 }
12044 {
12047 {
12053 else
12057 }
12059 /* The C99 flexible array extension. */
12062 {
12066 {
12069 }
12070 else
12071 {
12072 /* Array is a flexible member. */
12074 /* Do not warn on flexible array members in system
12079 else
12083 /* Flexible array member has a null domain. */
12085 }
12086 }
12089 {
12090 /* Happens when declaring arrays of sizes which
12091 are error_mark_node, for example. */
12093 }
12095 {
12096 /* Something like struct S { int N::j; }; */
12099 }
12102 {
12104 tree function_context;
12107 {
12108 /* This should never happen in pure C++ (the check
12109 could be an assert). It could happen in
12110 Objective-C++ if someone writes invalid code that
12111 uses a function declaration for an instance
12112 variable or property (instance variables and
12113 properties are parsed as FIELD_DECLs, but they are
12114 part of an Objective-C class, not a C++ class).
12115 That code is invalid and is caught by this
12116 check. */
12118 {
12120 unqualified_id);
12122 }
12124 /* ``A union may [ ... ] not [ have ] virtual functions.''
12125 ARM 9.5 */
12127 {
12129 unqualified_id);
12131 }
12136 {
12140 }
12141 }
12143 /* Check that the name used for a destructor makes sense. */
12145 {
12149 {
12154 }
12157 {
12161 }
12163 {
12166 }
12168 {
12171 }
12172 }
12174 {
12179 }
12182 {
12185 }
12187 {
12190 }
12193 {
12196 {
12202 }
12203 }
12205 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
12217 parms,
12218 unqualified_id,
12219 reqs,
12229 #if 0
12230 /* This clobbers the attrs stored in `decl' from `attrlist'. */
12231 /* The decl and setting of decl_attr is also turned off. */
12233 #endif
12235 /* [class.conv.ctor]
12237 A constructor declared without the function-specifier
12238 explicit that can be called with a single parameter
12239 specifies a conversion from the type of its first
12240 parameter to the type of its class. Such a constructor
12241 is called a converting constructor. */
12244 }
12249 {
12252 {
12254 {
12258 }
12259 else
12264 }
12265 }
12266 else
12267 {
12269 {
12273 }
12275 }
12278 {
12279 /* Friends are treated specially. */
12283 {
12285 {
12286 decl = check_explicit_specialization
12291 }
12295 funcdef_flag);
12297 }
12298 else
12300 }
12302 /* Structure field. It may not be a function, except for C++. */
12305 {
12307 {
12308 /* C++ allows static class members. All other work
12309 for this is done by grokfield. */
12317 unqualified_id);
12319 {
12323 }
12330 /* Even if there is an in-class initialization, DECL
12331 is considered undefined until an out-of-class
12332 definition is provided, unless this is an inline
12333 variable. */
12337 {
12343 }
12344 }
12345 else
12346 {
12349 unqualified_id);
12351 {
12353 unqualified_id);
12355 }
12360 {
12363 }
12366 {
12369 }
12372 {
12373 /* An attempt is being made to initialize a non-static
12374 member. This is new in C++11. */
12377 /* If this has been parsed with static storage class, but
12378 errors forced staticp to be cleared, ensure NSDMI is
12379 not present. */
12382 }
12383 }
12389 }
12390 }
12393 {
12394 tree original_name;
12402 else
12404 // FIXME:gcc_assert (original_name == dname);
12411 {
12414 name);
12415 else
12417 name);
12418 }
12422 /* Function declaration not at top level.
12423 Storage classes other than `extern' are not allowed
12424 and `extern' makes no difference. */
12429 {
12432 "%<static%> specifier invalid for function %qs "
12434 else
12436 "%<inline%> specifier invalid for function %qs "
12438 }
12441 {
12443 {
12446 }
12449 {
12454 }
12455 }
12457 /* Record whether the function is public. */
12467 publicp,
12470 sfk,
12471 funcdef_flag,
12480 {
12483 /* Don't allow a static member function in a class, and forbid
12484 declaring main to be static. */
12486 {
12490 }
12492 {
12493 /* 7.1.1: There can be no static function declarations within a
12494 block. */
12497 }
12500 {
12503 }
12504 }
12505 }
12506 else
12507 {
12508 /* It's a variable. */
12510 /* An uninitialized decl with `extern' is a reference. */
12512 declspecs,
12513 initialized,
12514 type_quals,
12515 inlinep,
12516 concept_p,
12517 template_count,
12527 {
12530 {
12535 }
12537 {
12540 }
12542 {
12544 "cannot explicitly declare member %q#D to have "
12547 }
12548 }
12550 {
12554 }
12559 {
12564 }
12565 }
12570 {
12574 }
12577 {
12579 {
12580 /* It's common practice (and completely valid) to have a const
12581 be initialized and declared extern. */
12584 }
12585 else
12586 {
12589 }
12590 }
12592 /* Record `register' declaration for warnings on &
12593 and in case doing stupid register allocation. */
12596 {
12598 /* Warn about register storage specifiers on PARM_DECLs. */
12600 {
12603 "ISO C++17 does not allow %<register%> storage "
12605 else
12608 }
12609 }
12615 /* Set constexpr flag on vars (functions got it in grokfndecl). */
12619 /* Record constancy and volatility on the DECL itself . There's
12620 no need to do this when processing a template; we'll do this
12621 for the instantiated declaration based on the type of DECL. */
12626 }
12627 }
12628 \f
12629 /* Subroutine of start_function. Ensure that each of the parameter
12630 types (as listed in PARMS) is complete, as is required for a
12631 function definition. */
12633 static void
12635 {
12637 {
12642 {
12648 }
12649 else
12650 /* grokparms or complete_type_or_else will have already issued
12651 an error. */
12653 }
12654 }
12656 /* Returns nonzero if T is a local variable. */
12658 int
12660 {
12662 /* A VAR_DECL with a context that is a _TYPE is a static data
12663 member. */
12665 /* Any other non-local variable must be at namespace scope. */
12671 }
12673 /* Like local_variable_p, but suitable for use as a tree-walking
12674 function. */
12676 static tree
12679 {
12687 }
12689 /* Check that ARG, which is a default-argument expression for a
12690 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
12691 something goes wrong. DECL may also be a _TYPE node, rather than a
12692 DECL, if there is no DECL available. */
12694 tree
12696 {
12697 tree var;
12698 tree decl_type;
12701 /* We get a DEFAULT_ARG when looking at an in-class declaration
12702 with a default argument. Ignore the argument for now; we'll
12703 deal with it after the class is complete. */
12707 {
12710 }
12711 else
12718 /* Something already went wrong. There's no need to check
12719 further. */
12722 /* [dcl.fct.default]
12724 A default argument expression is implicitly converted to the
12725 parameter type. */
12727 /* Avoid digest_init clobbering the initializer. */
12730 LOOKUP_IMPLICIT);
12733 /* Avoid redundant -Wzero-as-null-pointer-constant warnings at
12734 the call sites. */
12739 /* [dcl.fct.default]
12741 Local variables shall not be used in default argument
12742 expressions.
12744 The keyword `this' shall not be used in a default argument of a
12745 member function. */
12748 {
12750 {
12754 else
12756 }
12758 }
12760 /* All is well. */
12762 }
12764 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
12766 static tree
12768 {
12773 {
12776 else
12778 }
12780 /* Do warn about using typedefs to a deprecated class. */
12792 return type_is_deprecated
12796 }
12798 /* Decode the list of parameter types for a function type.
12799 Given the list of things declared inside the parens,
12800 return a list of types.
12802 If this parameter does not end with an ellipsis, we append
12803 void_list_node.
12805 *PARMS is set to the chain of PARM_DECLs created. */
12807 tree
12809 {
12812 tree parm;
12816 {
12829 {
12831 && !init
12834 /* DR 577: A parameter list consisting of a single
12835 unnamed parameter of non-dependent type 'void'. */
12839 "invalid use of cv-qualified type %qT in "
12841 else
12843 "invalid use of type %<void%> in parameter "
12845 /* It's not a good idea to actually create parameters of
12846 type `void'; other parts of the compiler assume that a
12847 void type terminates the parameter list. */
12850 }
12853 {
12855 {
12859 }
12861 /* Top-level qualifiers on the parameters are
12862 ignored for function types. */
12865 {
12869 }
12873 {
12874 /* Before C++17 DR 393:
12875 [dcl.fct]/6, parameter types cannot contain pointers
12876 (references) to arrays of unknown bound. */
12881 {
12889 }
12892 ptr
12898 }
12904 }
12909 }
12917 }
12919 \f
12920 /* D is a constructor or overloaded `operator='.
12922 Let T be the class in which D is declared. Then, this function
12923 returns:
12925 -1 if D's is an ill-formed constructor or copy assignment operator
12926 whose first parameter is of type `T'.
12927 0 if D is not a copy constructor or copy assignment
12928 operator.
12929 1 if D is a copy constructor or copy assignment operator whose
12930 first parameter is a reference to non-const qualified T.
12931 2 if D is a copy constructor or copy assignment operator whose
12932 first parameter is a reference to const qualified T.
12934 This function can be used as a predicate. Positive values indicate
12935 a copy constructor and nonzero values indicate a copy assignment
12936 operator. */
12938 int
12940 {
12941 tree args;
12942 tree arg_type;
12950 /* Instantiations of template member functions are never copy
12951 functions. Note that member functions of templated classes are
12952 represented as template functions internally, and we must
12953 accept those as copy functions. */
12965 {
12966 /* Pass by value copy assignment operator. */
12968 }
12972 {
12975 }
12976 else
12982 /* There are more non-optional args. */
12986 }
12988 /* D is a constructor or overloaded `operator='.
12990 Let T be the class in which D is declared. Then, this function
12991 returns true when D is a move constructor or move assignment
12992 operator, false otherwise. */
12994 bool
12996 {
13000 /* There are no move constructors if we are in C++98 mode. */
13006 /* Instantiations of template member functions are never move
13007 functions. Note that member functions of templated classes are
13008 represented as template functions internally, and we must
13009 accept those as move functions. */
13013 }
13015 /* D is a constructor or overloaded `operator='.
13017 Then, this function returns true when D has the same signature as a move
13018 constructor or move assignment operator (because either it is such a
13019 ctor/op= or it is a template specialization with the same signature),
13020 false otherwise. */
13022 bool
13024 {
13025 tree args;
13026 tree arg_type;
13046 /* There are more non-optional args. */
13050 }
13052 /* Remember any special properties of member function DECL. */
13054 void
13056 {
13057 tree class_type;
13064 {
13071 {
13072 /* [class.copy]
13074 A non-template constructor for class X is a copy
13075 constructor if its first parameter is of type X&, const
13076 X&, volatile X& or const volatile X&, and either there
13077 are no other parameters or else all other parameters have
13078 default arguments. */
13084 }
13095 }
13097 {
13098 /* [class.copy]
13100 A non-template assignment operator for class X is a copy
13101 assignment operator if its parameter is of type X, X&, const
13102 X&, volatile X& or const volatile X&. */
13107 {
13113 }
13116 }
13120 /* Destructors are handled in check_methods. */
13121 }
13123 /* Check a constructor DECL has the correct form. Complains
13124 if the class has a constructor of the form X(X). */
13126 bool
13128 {
13132 {
13133 /* [class.copy]
13135 A declaration of a constructor for a class X is ill-formed if
13136 its first parameter is of type (optionally cv-qualified) X
13137 and either there are no other parameters or else all other
13138 parameters have default arguments.
13140 We *don't* complain about member template instantiations that
13141 have this form, though; they can occur as we try to decide
13142 what constructor to use during overload resolution. Since
13143 overload resolution will never prefer such a constructor to
13144 the non-template copy constructor (which is either explicitly
13145 or implicitly defined), there's no need to worry about their
13146 existence. Theoretically, they should never even be
13147 instantiated, but that's hard to forestall. */
13151 }
13154 }
13156 /* DECL is a declaration for an overloaded or conversion operator. If
13157 COMPLAIN is true, errors are issued for invalid declarations. */
13159 bool
13161 {
13170 tree_code operator_code;
13173 {
13174 /* Conversion operators are TYPE_EXPR for the purposes of this
13175 function. */
13178 }
13179 else
13180 {
13187 }
13190 {
13191 /* operator new and operator delete are quite special. */
13194 {
13213 }
13215 /* [basic.std.dynamic.allocation]/1:
13217 A program is ill-formed if an allocation function is declared
13218 in a namespace scope other than global scope or declared
13219 static in global scope.
13221 The same also holds true for deallocation functions. */
13223 {
13225 {
13228 }
13231 {
13234 }
13235 }
13239 else
13240 {
13243 }
13246 }
13248 /* An operator function must either be a non-static member function
13249 or have at least one parameter of a class, a reference to a class,
13250 an enumeration, or a reference to an enumeration. 13.4.0.6 */
13252 {
13258 {
13261 }
13264 {
13268 }
13271 {
13273 {
13278 }
13284 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
13285 because these checks are performed even on template
13286 functions. */
13290 }
13291 }
13294 /* There are no further restrictions on the arguments to an overloaded
13295 "operator ()". */
13299 {
13300 /* 13.4.0.3 */
13303 }
13305 /* Count the number of arguments and check for ellipsis. */
13308 {
13310 {
13311 /* Variadic. */
13314 }
13316 }
13318 /* Verify correct number of arguments. */
13320 {
13323 {
13324 /* We have a unary instance of an ambi-ary op. Remap to the
13325 unary one. */
13331 }
13333 {
13334 /* This was an ambiguous operator but is invalid. */
13339 }
13342 && ! processing_template_decl
13343 /* x++ and x--'s second argument must be an int. */
13345 integer_type_node))
13346 {
13350 decl);
13352 }
13357 {
13362 }
13367 {
13372 }
13377 }
13379 /* There can be no default arguments. */
13382 {
13388 else
13389 {
13392 }
13393 }
13395 /* At this point the declaration is well-formed. It may not be
13396 sensible though. */
13398 /* Check member function warnings only on the in-class declaration.
13399 There's no point warning on an out-of-class definition. */
13403 /* Warn about conversion operators that will never be used. */
13407 {
13416 ref
13422 {
13425 ref
13430 /* Don't force t to be complete here. */
13435 ref
13440 }
13441 }
13446 /* Effective C++ rules below. */
13448 /* More Effective C++ rule 7. */
13455 /* More Effective C++ rule 6. */
13460 {
13469 {
13474 }
13475 else
13476 {
13479 }
13480 }
13482 /* Effective C++ rule 23. */
13493 }
13494 \f
13495 /* Return a string giving the keyword associate with CODE. */
13499 {
13501 {
13514 }
13515 }
13517 /* Name lookup in an elaborated-type-specifier (after the keyword
13518 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
13519 elaborated-type-specifier is invalid, issue a diagnostic and return
13520 error_mark_node; otherwise, return the *_TYPE to which it referred.
13521 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
13523 tree
13525 tree decl,
13527 {
13528 tree type;
13530 /* In the case of:
13532 struct S { struct S *p; };
13534 name lookup will find the TYPE_DECL for the implicit "S::S"
13535 typedef. Adjust for that here. */
13541 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
13542 is false for this case as well. */
13544 {
13548 }
13549 /* Accept template template parameters. */
13553 ;
13554 /* [dcl.type.elab]
13556 If the identifier resolves to a typedef-name or the
13557 simple-template-id resolves to an alias template
13558 specialization, the elaborated-type-specifier is ill-formed.
13560 In other words, the only legitimate declaration to use in the
13561 elaborated type specifier is the implicit typedef created when
13562 the type is declared. */
13566 {
13570 else
13575 }
13580 {
13584 }
13587 {
13591 }
13595 {
13596 /* If a class template appears as elaborated type specifier
13597 without a template header such as:
13599 template <class T> class C {};
13600 void f(class C); // No template header here
13602 then the required template argument is missing. */
13607 }
13610 }
13612 /* Lookup NAME in elaborate type specifier in scope according to
13613 SCOPE and issue diagnostics if necessary.
13614 Return *_TYPE node upon success, NULL_TREE when the NAME is not
13615 found, and ERROR_MARK_NODE for type error. */
13617 static tree
13620 {
13621 tree t;
13622 tree decl;
13624 {
13625 /* First try ordinary name lookup, ignoring hidden class name
13626 injected via friend declaration. */
13629 /* If that fails, the name will be placed in the smallest
13630 non-class, non-function-prototype scope according to 3.3.1/5.
13631 We may already have a hidden name declared as friend in this
13632 scope. So lookup again but not ignoring hidden names.
13633 If we find one, that name will be made visible rather than
13634 creating a new tag. */
13637 }
13638 else
13643 /* If scope is ts_current we're defining a class, so ignore a
13644 template template parameter. */
13650 {
13651 /* Look for invalid nested type:
13652 class C {
13653 class C {};
13654 }; */
13656 {
13659 decl);
13661 }
13663 /* Two cases we need to consider when deciding if a class
13664 template is allowed as an elaborated type specifier:
13665 1. It is a self reference to its own class.
13666 2. It comes with a template header.
13668 For example:
13670 template <class T> class C {
13671 class C *c1; // DECL_SELF_REFERENCE_P is true
13672 class D;
13673 };
13674 template <class U> class C; // template_header_p is true
13675 template <class T> class C<T>::D {
13676 class C *c2; // DECL_SELF_REFERENCE_P is true
13677 }; */
13680 decl,
13681 template_header_p
13686 {
13695 }
13698 }
13700 {
13704 }
13705 else
13707 }
13709 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
13710 Define the tag as a forward-reference if it is not defined.
13712 If a declaration is given, process it here, and report an error if
13713 multiple declarations are not identical.
13715 SCOPE is TS_CURRENT when this is also a definition. Only look in
13716 the current frame for the name (since C++ allows new names in any
13717 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
13718 declaration. Only look beginning from the current scope outward up
13719 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
13721 TEMPLATE_HEADER_P is true when this declaration is preceded by
13722 a set of template parameters. */
13724 static tree
13727 {
13734 {
13747 }
13749 /* In case of anonymous name, xref_tag is only called to
13750 make type node and push name. Name lookup is not required. */
13761 {
13765 /* Since SCOPE is not TS_CURRENT, we are not looking at a
13766 definition of this tag. Since, in addition, we are currently
13767 processing a (member) template declaration of a template
13768 class, we must be very careful; consider:
13770 template <class X> struct S1
13772 template <class U> struct S2
13773 {
13774 template <class V> friend struct S1;
13775 };
13777 Here, the S2::S1 declaration should not be confused with the
13778 outer declaration. In particular, the inner version should
13779 have a template parameter of level 2, not level 1.
13781 On the other hand, when presented with:
13783 template <class T> struct S1
13784 {
13785 template <class U> struct S2 {};
13786 template <class U> friend struct S2;
13787 };
13789 the friend must find S1::S2 eventually. We accomplish this
13790 by making sure that the new type we create to represent this
13791 declaration has the right TYPE_CONTEXT. */
13794 }
13797 {
13798 /* If no such tag is yet defined, create a forward-reference node
13799 and record it as the "definition".
13800 When a real declaration of this type is found,
13801 the forward-reference will be altered into a real type. */
13803 {
13806 }
13807 else
13808 {
13812 {
13813 /* Mark it as a lambda type. */
13815 /* And push it into current scope. */
13817 }
13819 }
13820 }
13821 else
13822 {
13824 {
13825 /* Check that we aren't trying to overload a class with different
13826 constraints. */
13829 {
13832 }
13835 }
13839 {
13843 }
13846 {
13847 /* This is no longer an invisible friend. Make it
13848 visible. */
13855 {
13859 }
13860 }
13861 }
13864 }
13866 /* Wrapper for xref_tag_1. */
13868 tree
13871 {
13872 tree ret;
13878 }
13881 tree
13883 {
13888 else
13895 }
13897 /* Create the binfo hierarchy for REF with (possibly NULL) base list
13898 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
13899 access_* node, and the TREE_VALUE is the type of the base-class.
13900 Non-NULL TREE_TYPE indicates virtual inheritance. */
13902 void
13904 {
13911 tree default_access;
13917 /* The base of a derived class is private by default, all others are
13918 public. */
13923 /* First, make sure that any templates in base-classes are
13924 instantiated. This ensures that if we call ourselves recursively
13925 we do not get confused about which classes are marked and which
13926 are not. */
13929 {
13932 /* The dependent_type_p call below should really be dependent_scope_p
13933 so that we give a hard error about using an incomplete type as a
13934 base, but we allow it with a pedwarn for backward
13935 compatibility. */
13941 /* An incomplete type. Remove it from the list. */
13943 else
13944 {
13945 max_bases++;
13947 max_dvbases++;
13951 }
13952 }
13957 /* The binfo slot should be empty, unless this is an (ill-formed)
13958 redefinition. */
13969 /* Apply base-class info set up to the variants of this type. */
13973 {
13975 /* A C++98 POD cannot have base classes. */
13979 {
13982 }
13983 }
13990 {
13991 /* An aggregate can't have virtual base classes. */
13999 }
14002 {
14010 /* Before C++17, an aggregate cannot have base classes. In C++17, an
14011 aggregate can't have virtual, private, or protected base classes. */
14022 {
14024 basetype);
14026 }
14030 {
14032 /* The original basetype could have been a typedef'd type. */
14035 /* Inherit flags from the base. */
14046 }
14048 /* We must do this test after we've seen through a typedef
14049 type. */
14051 {
14054 else
14057 }
14060 /* Regenerate the pack expansion for the bases. */
14074 dropped_base:
14075 /* Update max_vbases to reflect the reality that we are dropping
14076 this base: if it reaches zero we want to undo the vec_alloc
14077 above to avoid inconsistencies during error-recovery: eg, in
14078 build_special_member_call, CLASSTYPE_VBASECLASSES non null
14079 and vtt null (c++/27952). */
14081 max_vbases--;
14083 max_vbases
14085 }
14092 /* If we didn't get max_vbases vbases, we must have shared at
14093 least one of them, and are therefore diamond shaped. */
14096 /* Unmark all the types. */
14101 /* Now see if we have a repeated base type. */
14103 {
14106 {
14108 {
14111 }
14113 }
14118 else
14120 }
14121 }
14123 \f
14124 /* Copies the enum-related properties from type SRC to type DST.
14125 Used with the underlying type of an enum and the enum itself. */
14126 static void
14128 {
14129 tree t;
14131 {
14141 else
14145 }
14146 }
14148 /* Begin compiling the definition of an enumeration type.
14149 NAME is its name,
14151 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
14153 UNDERLYING_TYPE is the type that will be used as the storage for
14154 the enumeration type. This should be NULL_TREE if no storage type
14155 was specified.
14157 ATTRIBUTES are any attributes specified after the enum-key.
14159 SCOPED_ENUM_P is true if this is a scoped enumeration type.
14161 if IS_NEW is not NULL, gets TRUE iff a new type is created.
14163 Returns the type object, as yet incomplete.
14164 Also records info about it so that build_enumerator
14165 may be used to declare the individual values as they are read. */
14167 tree
14170 {
14176 /* [C++0x dcl.enum]p5:
14178 If not explicitly specified, the underlying type of a scoped
14179 enumeration type is int. */
14186 /* If this is the real definition for a previous forward reference,
14187 fill in the contents in the same object that used to be the
14188 forward reference. */
14194 /* In case of a template_decl, the only check that should be deferred
14195 to instantiation time is the comparison of underlying types. */
14197 {
14199 {
14205 }
14207 {
14213 }
14219 {
14225 }
14226 }
14230 {
14231 /* In case of error, make a dummy enum to allow parsing to
14232 continue. */
14234 {
14237 }
14239 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
14240 of an opaque enum, or an opaque enum of an already defined
14241 enumeration (C++0x only).
14242 In any other case, it'll be NULL_TREE. */
14244 {
14247 }
14250 /* Do not push the decl more than once, unless we need to
14251 compare underlying types at instantiation time */
14254 || (underlying_type
14258 {
14262 /* std::byte aliases anything. */
14267 }
14268 else
14275 /* The enum is considered opaque until the opening '{' of the
14276 enumerator list. */
14279 }
14286 {
14288 /* We already checked that it matches, don't change it to a different
14291 {
14294 }
14297 else
14300 }
14302 /* If into a template class, the returned enum is always the first
14303 declaration (opaque or not) seen. This way all the references to
14304 this type will be to the same declaration. The following ones are used
14305 only to check for definition errors. */
14308 else
14310 }
14312 /* After processing and defining all the values of an enumeration type,
14313 install their decls in the enumeration type.
14314 ENUMTYPE is the type object. */
14316 void
14318 {
14319 tree values;
14320 tree underlying_type;
14321 tree decl;
14322 tree value;
14324 tree t;
14326 bool fixed_underlying_type_p
14329 /* We built up the VALUES in reverse order. */
14332 /* For an enum defined in a template, just set the type of the values;
14333 all further processing is postponed until the template is
14334 instantiated. We need to set the type so that tsubst of a CONST_DECL
14335 works. */
14337 {
14339 values;
14343 }
14345 /* Determine the minimum and maximum values of the enumerators. */
14347 {
14351 values;
14353 {
14356 /* [dcl.enum]: Following the closing brace of an enum-specifier,
14357 each enumerator has the type of its enumeration. Prior to the
14358 closing brace, the type of each enumerator is the type of its
14359 initializing value. */
14362 /* Update the minimum and maximum values, if appropriate. */
14366 /* Figure out what the minimum and maximum values of the
14367 enumerators are. */
14374 }
14375 }
14376 else
14377 /* [dcl.enum]
14379 If the enumerator-list is empty, the underlying type is as if
14380 the enumeration had a single enumerator with value 0. */
14384 {
14385 /* Compute the number of bits require to represent all values of the
14386 enumeration. We must do this before the type of MINNODE and
14387 MAXNODE are transformed, since tree_int_cst_min_precision relies
14388 on the TREE_TYPE of the value it is passed. */
14396 /* Determine the underlying type of the enumeration.
14398 [dcl.enum]
14400 The underlying type of an enumeration is an integral type that
14401 can represent all the enumerator values defined in the
14402 enumeration. It is implementation-defined which integral type is
14403 used as the underlying type for an enumeration except that the
14404 underlying type shall not be larger than int unless the value of
14405 an enumerator cannot fit in an int or unsigned int.
14407 We use "int" or an "unsigned int" as the underlying type, even if
14408 a smaller integral type would work, unless the user has
14409 explicitly requested that we use the smallest possible type. The
14410 user can request that for all enumerations with a command line
14411 flag, or for just one enumeration with an attribute. */
14413 use_short_enum = flag_short_enums
14416 /* If the precision of the type was specified with an attribute and it
14417 was too small, give an error. Otherwise, use it. */
14419 {
14422 else
14423 {
14426 }
14427 }
14431 itk++)
14432 {
14438 }
14440 {
14441 /* DR 377
14443 IF no integral type can represent all the enumerator values, the
14444 enumeration is ill-formed. */
14449 }
14451 /* [dcl.enum]
14453 The value of sizeof() applied to an enumeration type, an object
14454 of an enumeration type, or an enumerator, is the value of sizeof()
14455 applied to the underlying type. */
14458 /* Compute the minimum and maximum values for the type.
14460 [dcl.enum]
14462 For an enumeration where emin is the smallest enumerator and emax
14463 is the largest, the values of the enumeration are the values of the
14464 underlying type in the range bmin to bmax, where bmin and bmax are,
14465 respectively, the smallest and largest values of the smallest bit-
14466 field that can store emin and emax. */
14468 /* The middle-end currently assumes that types with TYPE_PRECISION
14469 narrower than their underlying type are suitably zero or sign
14470 extended to fill their mode. Similarly, it assumes that the front
14471 end assures that a value of a particular type must be within
14472 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
14474 We used to set these fields based on bmin and bmax, but that led
14475 to invalid assumptions like optimizing away bounds checking. So
14476 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
14477 TYPE_MAX_VALUE to the values for the mode above and only restrict
14478 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
14482 set_min_and_max_values_for_integral_type
14485 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
14488 }
14489 else
14492 /* Convert each of the enumerators to the type of the underlying
14493 type of the enumeration. */
14495 {
14496 location_t saved_location;
14502 /* If the enumeration type has a fixed underlying type, we
14503 already checked all of the enumerator values. */
14505 else
14508 tf_warning_or_error);
14511 /* Do not clobber shared ints. */
14513 {
14517 }
14519 }
14521 /* Fix up all variant types of this enum type. */
14528 {
14530 /* TYPE_FIELDS needs fixup. */
14532 }
14534 /* Finish debugging output for this type. */
14537 /* Each enumerator now has the type of its enumeration. Clear the cache
14538 so that this change in types doesn't confuse us later on. */
14540 }
14542 /* Finishes the enum type. This is called only the first time an
14543 enumeration is seen, be it opaque or odinary.
14544 ENUMTYPE is the type object. */
14546 void
14548 {
14550 {
14554 }
14556 /* If this is a forward declaration, there should not be any variants,
14557 though we can get a variant in the middle of an enum-specifier with
14558 wacky code like 'enum E { e = sizeof(const E*) };' */
14562 }
14564 /* Build and install a CONST_DECL for an enumeration constant of the
14565 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
14566 Apply ATTRIBUTES if available. LOC is the location of NAME.
14567 Assignment of sequential values by default is handled here. */
14569 void
14571 location_t loc)
14572 {
14573 tree decl;
14574 tree context;
14575 tree type;
14577 /* scalar_constant_value will pull out this expression, so make sure
14578 it's folded as appropriate. */
14582 /* If the VALUE was erroneous, pretend it wasn't there; that will
14583 result in the enum being assigned the next value in sequence. */
14587 /* Remove no-op casts from the value. */
14592 {
14593 /* Validate and default VALUE. */
14595 {
14597 {
14602 }
14605 value = perform_implicit_conversion_flags
14613 {
14616 {
14620 }
14621 else
14622 {
14626 {
14630 }
14631 }
14632 }
14633 }
14635 /* Default based on previous value. */
14637 {
14639 {
14640 tree prev_value;
14643 /* C++03 7.2/4: If no initializer is specified for the first
14644 enumerator, the type is an unspecified integral
14645 type. Otherwise the type is the same as the type of the
14646 initializing value of the preceding enumerator unless the
14647 incremented value is not representable in that type, in
14648 which case the type is an unspecified integral type
14649 sufficient to contain the incremented value. */
14653 else
14654 {
14660 {
14663 {
14666 {
14672 }
14679 }
14682 else
14684 }
14687 {
14690 }
14691 }
14692 }
14693 else
14695 }
14697 /* Remove no-op casts from the value. */
14700 /* If the underlying type of the enum is fixed, check whether
14701 the enumerator values fits in the underlying type. If it
14702 does not fit, the program is ill-formed [C++0x dcl.enum]. */
14704 && value
14706 {
14711 /* Convert the value to the appropriate type. */
14713 }
14714 }
14716 /* C++ associates enums with global, function, or class declarations. */
14719 /* Build the actual enumeration constant. Note that the enumeration
14720 constants have the underlying type of the enum (if it is fixed)
14721 or the type of their initializer (if the underlying type of the
14722 enum is not fixed):
14724 [ C++0x dcl.enum ]
14726 If the underlying type is fixed, the type of each enumerator
14727 prior to the closing brace is the underlying type; if the
14728 initializing value of an enumerator cannot be represented by
14729 the underlying type, the program is ill-formed. If the
14730 underlying type is not fixed, the type of each enumerator is
14731 the type of its initializing value.
14733 If the underlying type is not fixed, it will be computed by
14734 finish_enum and we will reset the type of this enumerator. Of
14735 course, if we're processing a template, there may be no value. */
14749 {
14750 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
14751 on the TYPE_FIELDS list for `S'. (That's so that you can say
14752 things like `S::i' later.) */
14754 /* The enumerator may be getting declared outside of its enclosing
14755 class, like so:
14757 class S { public: enum E : int; }; enum S::E : int { i = 7; };
14759 For which case we need to make sure that the access of `S::i'
14760 matches the access of `S::E'. */
14766 else
14772 }
14773 else
14776 /* Add this enumeration constant to the list for this type. */
14778 }
14780 /* Look for an enumerator with the given NAME within the enumeration
14781 type ENUMTYPE. This routine is used primarily for qualified name
14782 lookup into an enumerator in C++0x, e.g.,
14784 enum class Color { Red, Green, Blue };
14786 Color color = Color::Red;
14788 Returns the value corresponding to the enumerator, or
14789 NULL_TREE if no such enumerator was found. */
14790 tree
14792 {
14793 tree e;
14798 }
14800 \f
14801 /* We're defining DECL. Make sure that its type is OK. */
14803 static void
14805 {
14809 /* In a function definition, arg types must be complete. */
14816 {
14821 /* Make it return void instead. */
14824 void_type_node,
14826 else
14828 fntype
14831 fntype = (cp_build_type_attribute_variant
14834 }
14835 else
14836 {
14840 }
14841 }
14843 /* True iff FN is an implicitly-defined default constructor. */
14845 static bool
14847 {
14851 }
14853 /* Clobber the contents of *this to let the back end know that the object
14854 storage is dead when we enter the constructor or leave the destructor. */
14856 static tree
14858 {
14859 /* Clobbering an empty base is pointless, and harmful if its one byte
14860 TYPE_SIZE overlays real data. */
14864 /* If we have virtual bases, clobber the whole object, but only if we're in
14865 charge. If we don't have virtual bases, clobber the as-base type so we
14866 don't mess with tail padding. */
14878 {
14881 }
14888 }
14890 /* Create the FUNCTION_DECL for a function definition.
14891 DECLSPECS and DECLARATOR are the parts of the declaration;
14892 they describe the function's name and the type it returns,
14893 but twisted together in a fashion that parallels the syntax of C.
14895 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
14896 DECLARATOR is really the DECL for the function we are about to
14897 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
14898 indicating that the function is an inline defined in-class.
14900 This function creates a binding context for the function body
14901 as well as setting up the FUNCTION_DECL in current_function_decl.
14903 For C++, we must first check whether that datum makes any sense.
14904 For example, "class A local_a(1,2);" means that variable local_a
14905 is an aggregate of type A, which should have a constructor
14906 applied to it with the argument list [1, 2].
14908 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
14909 or may be a BLOCK if the function has been defined previously
14910 in this translation unit. On exit, DECL_INITIAL (decl1) will be
14911 error_mark_node if the function has never been defined, or
14912 a BLOCK if the function has been defined somewhere. */
14914 bool
14916 {
14918 tree fntype;
14919 tree restype;
14922 tree current_function_parms;
14927 /* Sanity check. */
14935 /* ISO C++ 11.4/5. A friend function defined in a class is in
14936 the (lexical) scope of the class in which it is defined. */
14938 {
14941 /* CTYPE could be null here if we're dealing with a template;
14942 for example, `inline friend float foo()' inside a template
14943 will have no CTYPE set. */
14946 else
14948 }
14955 /* Handle gnu_inline attribute. */
14957 {
14962 }
14965 /* This is a constructor, we must ensure that any default args
14966 introduced by this definition are propagated to the clones
14967 now. The clones are used directly in overload resolution. */
14970 /* Sometimes we don't notice that a function is a static member, and
14971 build a METHOD_TYPE for it. Fix that up now. */
14975 /* Set up current_class_type, and enter the scope of the class, if
14976 appropriate. */
14982 /* Now that we have entered the scope of the class, we must restore
14983 the bindings for any template parameters surrounding DECL1, if it
14984 is an inline member template. (Order is important; consider the
14985 case where a template parameter has the same name as a field of
14986 the class.) It is not until after this point that
14987 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
14991 /* Effective C++ rule 15. */
14999 /* Make the init_value nonzero so pushdecl knows this is not tentative.
15000 error_mark_node is replaced below (in poplevel) with the BLOCK. */
15004 /* This function exists in static storage.
15005 (This does not mean `static' in the C sense!) */
15008 /* We must call push_template_decl after current_class_type is set
15009 up. (If we are processing inline definitions after exiting a
15010 class scope, current_class_type will be NULL_TREE until set above
15011 by push_nested_class.) */
15013 {
15016 {
15020 }
15022 }
15024 /* Make sure the parameter and return types are reasonable. When
15025 you declare a function, these types can be incomplete, but they
15026 must be complete when you define the function. */
15029 /* Build the return declaration for the function. */
15033 {
15034 tree resdecl;
15042 }
15044 /* Record the decl so that the function name is defined.
15045 If we already have a decl for this name, and it is a FUNCTION_DECL,
15046 use the old decl. */
15048 {
15049 /* A specialization is not used to guide overload resolution. */
15053 {
15057 /* If something went wrong when registering the declaration,
15058 use DECL1; we have to have a FUNCTION_DECL to use when
15059 parsing the body of the function. */
15060 ;
15061 else
15062 {
15063 /* Otherwise, OLDDECL is either a previous declaration
15064 of the same function or DECL1 itself. */
15071 {
15072 tree context;
15074 /* Check whether DECL1 is in an anonymous
15075 namespace. */
15077 context;
15079 {
15083 }
15087 OPT_Wmissing_declarations,
15089 }
15092 }
15093 }
15094 else
15095 {
15096 /* We need to set the DECL_CONTEXT. */
15099 }
15103 /* If #pragma weak applies, mark the decl appropriately now.
15104 The pragma only applies to global functions. Because
15105 determining whether or not the #pragma applies involves
15106 computing the mangled name for the declaration, we cannot
15107 apply the pragma until after we have merged this declaration
15108 with any previous declarations; if the original declaration
15109 has a linkage specification, that specification applies to
15110 the definition as well, and may affect the mangled name. */
15113 }
15115 /* We are now in the scope of the function being defined. */
15118 /* Save the parm names or decls from this function's declarator
15119 where store_parm_decls will find them. */
15122 /* Let the user know we're compiling this function. */
15127 /* This function may already have been parsed, in which case just
15128 return; our caller will skip over the body without parsing. */
15132 /* Initialize RTL machinery. We cannot do this until
15133 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
15134 even when processing a template; this is how we get
15135 CFUN set up, and our per-function variables initialized.
15136 FIXME factor out the non-RTL stuff. */
15140 /* Initialize the language data structures. Whenever we start
15141 a new function, we destroy temporaries in the usual way. */
15147 {
15150 }
15152 /* Start the statement-tree, start the tree now. */
15155 /* If we are (erroneously) defining a function that we have already
15156 defined before, wipe out what we knew before. */
15161 {
15162 /* We know that this was set up by `grokclassfn'. We do not
15163 wait until `store_parm_decls', since evil parse errors may
15164 never get us to that point. Here we keep the consistency
15165 between `current_class_type' and `current_class_ptr'. */
15171 cp_function_chain->x_current_class_ref
15173 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
15176 /* Constructors and destructors need to know whether they're "in
15177 charge" of initializing virtual base classes. */
15180 {
15183 }
15185 {
15188 }
15189 }
15192 /* Implicitly-defined methods (like the
15193 destructor for a class in which no destructor
15194 is explicitly declared) must not be defined
15195 until their definition is needed. So, we
15196 ignore interface specifications for
15197 compiler-generated functions. */
15203 {
15210 /* This is a function in a local class in an extern inline
15211 or template function. */
15213 }
15214 /* If this function belongs to an interface, it is public.
15215 If it belongs to someone else's interface, it is also external.
15216 This only affects inlines and template instantiations. */
15218 {
15221 {
15225 && ! flag_implement_inlines
15228 /* For WIN32 we also want to put these in linkonce sections. */
15230 }
15231 else
15234 /* If this function is in an interface implemented in this file,
15235 make sure that the back end knows to emit this function
15236 here. */
15239 }
15242 {
15243 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
15244 interface, we will have both finfo->interface_unknown and
15245 finfo->interface_only set. In that case, we don't want to
15246 use the normal heuristics because someone will supply a
15247 #pragma implementation elsewhere, and deducing it here would
15248 produce a conflict. */
15253 }
15254 else
15255 {
15256 /* This is a definition, not a reference.
15257 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
15265 else
15267 }
15269 /* Determine the ELF visibility attribute for the function. We must not
15270 do this before calling "pushdecl", as we must allow "duplicate_decls"
15271 to merge any attributes appropriately. We also need to wait until
15272 linkage is set. */
15286 {
15289 }
15299 /* Clobbering an empty base is harmful if it overlays real data. */
15301 /* We can't clobber safely for an implicitly-defined default constructor
15302 because part of the initialization might happen before we enter the
15303 constructor, via AGGR_INIT_ZERO_FIRST (c++/68006). */
15317 }
15320 /* Like start_preparsed_function, except that instead of a
15321 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
15323 Returns true on success. If the DECLARATOR is not suitable
15324 for a function, we return false, which tells the parser to
15325 skip the entire function. */
15327 bool
15330 tree attrs)
15331 {
15332 tree decl1;
15338 /* If the declarator is not suitable for a function definition,
15339 cause a syntax error. */
15341 {
15344 }
15347 /* main must return int. grokfndecl should have corrected it
15348 (and issued a diagnostic) if the user got it wrong. */
15350 integer_type_node));
15353 }
15354 \f
15355 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
15356 FN. */
15358 static bool
15360 {
15362 && !processing_template_decl
15364 /* We insert the EH_SPEC_BLOCK only in the original
15365 function; then, it is copied automatically to the
15366 clones. */
15368 /* Implicitly-generated constructors and destructors have
15369 exception specifications. However, those specifications
15370 are the union of the possible exceptions specified by the
15371 constructors/destructors for bases and members, so no
15372 unallowed exception will ever reach this function. By
15373 not creating the EH_SPEC_BLOCK we save a little memory,
15374 and we avoid spurious warnings about unreachable
15375 code. */
15377 }
15379 /* Store the parameter declarations into the current function declaration.
15380 This is called after parsing the parameter declarations, before
15381 digesting the body of the function.
15383 Also install to binding contour return value identifier, if any. */
15385 static void
15387 {
15389 tree parm;
15391 /* This is a chain of any other decls that came in among the parm
15392 declarations. If a parm is declared with enum {foo, bar} x;
15393 then CONST_DECLs for foo and bar are put here. */
15397 {
15398 /* This case is when the function was defined with an ANSI prototype.
15399 The parms already have decls, so we need not do anything here
15400 except record them as in effect
15401 and complain if any redundant old-style parm decls were written. */
15404 tree next;
15406 /* Must clear this because it might contain TYPE_DECLs declared
15407 at class level. */
15410 /* If we're doing semantic analysis, then we'll call pushdecl
15411 for each of these. We must do them in reverse order so that
15412 they end in the correct forward order. */
15416 {
15420 else
15421 {
15422 /* If we find an enum constant or a type tag,
15423 put it aside for the moment. */
15426 }
15427 }
15429 /* Get the decls in their original chain order and record in the
15430 function. This is all and only the PARM_DECLs that were
15431 pushed into scope by the loop above. */
15433 }
15434 else
15437 /* Now store the final chain of decls for the arguments
15438 as the decl-chain of the current lexical scope.
15439 Put the enumerators in as well, at the front so that
15440 DECL_ARGUMENTS is not modified. */
15445 }
15447 \f
15448 /* We have finished doing semantic analysis on DECL, but have not yet
15449 generated RTL for its body. Save away our current state, so that
15450 when we want to generate RTL later we know what to do. */
15452 static void
15454 {
15457 /* Save the language-specific per-function data so that we can
15458 get it back when we really expand this function. */
15461 /* Make a copy. */
15466 /* Clear out the bits we don't need. */
15471 }
15474 /* Set the return value of the constructor (if present). */
15476 static void
15478 {
15479 tree val;
15480 tree exprstmt;
15483 {
15484 /* Any return from a constructor will end up here. */
15490 /* Return the address of the object. */
15493 }
15494 }
15496 /* Do all the processing for the beginning of a destructor; set up the
15497 vtable pointers and cleanups for bases and members. */
15499 static void
15501 {
15502 tree compound_stmt;
15504 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
15505 issued an error message. We still want to try to process the
15506 body of the function, but initialize_vtbl_ptrs will crash if
15507 TYPE_BINFO is NULL. */
15509 {
15511 /* Make all virtual function table pointers in non-virtual base
15512 classes point to CURRENT_CLASS_TYPE's virtual function
15513 tables. */
15518 /* Clobbering an empty base is harmful if it overlays real data. */
15520 {
15524 {
15526 tree ref
15533 tf_warning_or_error);
15535 }
15536 else
15538 }
15540 /* And insert cleanups for our bases and members so that they
15541 will be properly destroyed if we throw. */
15543 }
15544 }
15546 /* At the end of every destructor we generate code to delete the object if
15547 necessary. Do that now. */
15549 static void
15551 {
15552 tree exprstmt;
15554 /* Any return from a destructor will end up here; that way all base
15555 and member cleanups will be run when the function returns. */
15559 {
15560 tree val;
15565 /* Return the address of the object. */
15568 }
15569 }
15571 /* Do the necessary processing for the beginning of a function body, which
15572 in this case includes member-initializers, but not the catch clauses of
15573 a function-try-block. Currently, this means opening a binding level
15574 for the member-initializers (in a ctor), member cleanups (in a dtor),
15575 and capture proxies (in a lambda operator()). */
15577 tree
15579 {
15580 tree stmt;
15587 else
15588 /* Always keep the BLOCK node associated with the outermost pair of
15589 curly braces of a function. These are needed for correct
15590 operation of dwarfout.c. */
15601 }
15603 /* Do the processing for the end of a function body. Currently, this means
15604 closing out the cleanups for fully-constructed bases and members, and in
15605 the case of the destructor, deleting the object if desired. Again, this
15606 is only meaningful for [cd]tors, since they are the only functions where
15607 there is a significant distinction between the main body and any
15608 function catch clauses. Handling, say, main() return semantics here
15609 would be wrong, as flowing off the end of a function catch clause for
15610 main() would also need to return 0. */
15612 void
15614 {
15618 /* Close the block. */
15627 }
15629 /* Given a function, returns the BLOCK corresponding to the outermost level
15630 of curly braces, skipping the artificial block created for constructor
15631 initializers. */
15633 tree
15635 {
15645 }
15647 /* If FNDECL is a class's key method, add the class to the list of
15648 keyed classes that should be emitted. */
15650 static void
15652 {
15656 {
15660 }
15661 }
15663 /* Subroutine of finish_function.
15664 Save the body of constexpr functions for possible
15665 future compile time evaluation. */
15667 static void
15669 {
15675 }
15677 /* Finish up a function declaration and compile that function
15678 all the way to assembler language output. The free the storage
15679 for the function definition. INLINE_P is TRUE if we just
15680 finished processing the body of an in-class inline function
15681 definition. (This processing will have taken place after the
15682 class definition is complete.) */
15684 tree
15686 {
15690 /* When we get some parse errors, we can end up without a
15691 current_function_decl, so cope. */
15704 /* TREE_READONLY (fndecl) = 1;
15705 This caused &foo to be of type ptr-to-const-function
15706 which then got a warning when stored in a ptr-to-function variable. */
15709 /* The current function is being defined, so its DECL_INITIAL should
15710 be set, and unless there's a multiple definition, it should be
15711 error_mark_node. */
15714 /* For a cloned function, we've already got all the code we need;
15715 there's no need to add any extra bits. */
15717 {
15718 /* Make it so that `main' always returns 0 by default. */
15725 current_eh_spec_block);
15726 }
15728 /* If we're saving up tree structure, tie off the function now. */
15733 /* If this function can't throw any exceptions, remember that. */
15736 && !flag_non_call_exceptions
15740 /* This must come after expand_function_end because cleanups might
15741 have declarations (from inline functions) that need to go into
15742 this function's blocks. */
15744 /* If the current binding level isn't the outermost binding level
15745 for this function, either there is a bug, or we have experienced
15746 syntax errors and the statement tree is malformed. */
15748 {
15749 /* Make sure we have already experienced errors. */
15752 /* Throw away the broken statement tree and extra binding
15753 levels. */
15757 {
15760 else
15762 }
15763 }
15766 /* Statements should always be full-expressions at the outermost set
15767 of curly braces for a function. */
15770 /* If there are no return statements in a function with auto return type,
15771 the return type is void. But if the declared type is something like
15772 auto*, this is an error. */
15775 {
15777 {
15780 }
15783 {
15785 current_function_auto_return_pattern);
15788 }
15789 }
15791 // If this is a concept, check that the definition is reasonable.
15795 /* Lambda closure members are implicitly constexpr if possible. */
15799 = ((processing_template_decl
15803 /* Save constexpr function body before it gets munged by
15804 the NRV transformation. */
15807 /* Invoke the pre-genericize plugin before we start munging things. */
15811 /* Perform delayed folding before NRV transformation. */
15815 /* Set up the named return value optimization, if we can. Candidate
15816 variables are selected in check_return_expr. */
15818 {
15820 tree outer;
15823 /* This is only worth doing for fns that return in memory--and
15824 simpler, since we don't have to worry about promoted modes. */
15826 /* Only allow this for variables declared in the outer scope of
15827 the function so we know that their lifetime always ends with a
15828 return; see g++.dg/opt/nrv6.C. We could be more flexible if
15829 we were to do this optimization in tree-ssa. */
15835 }
15837 /* Remember that we were in class scope. */
15841 /* Must mark the RESULT_DECL as being in this function. */
15844 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
15845 to the FUNCTION_DECL node itself. */
15848 /* Save away current state, if appropriate. */
15852 /* Complain if there's just no return statement. */
15857 /* Don't complain if we abort or throw. */
15858 && !current_function_returns_abnormally
15859 /* Don't complain if there's an infinite loop. */
15860 && !current_function_infinite_loop
15861 /* Don't complain if we are declared noreturn. */
15865 /* Structor return values (if any) are set by the compiler. */
15869 {
15873 }
15875 /* Store the end of the function, so that we get good line number
15876 info for the epilogue. */
15879 /* Complain about parameters that are only set, but never otherwise used. */
15881 && !processing_template_decl
15884 {
15885 tree decl;
15888 decl;
15902 OPT_Wunused_but_set_parameter,
15905 }
15907 /* Complain about locally defined typedefs that are not used in this
15908 function. */
15911 /* Possibly warn about unused parameters. */
15913 && !processing_template_decl
15917 /* Genericize before inlining. */
15919 {
15922 /* Clear out the bits we don't need. */
15932 }
15933 /* Clear out the bits we don't need. */
15936 /* We're leaving the context of this function, so zap cfun. It's still in
15937 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
15941 /* If this is an in-class inline definition, we may have to pop the
15942 bindings for the template parameters that we added in
15943 maybe_begin_member_template_processing when start_function was
15944 called. */
15948 /* Leave the scope of the class. */
15954 /* Clean up. */
15959 }
15960 \f
15961 /* Create the FUNCTION_DECL for a function definition.
15962 DECLSPECS and DECLARATOR are the parts of the declaration;
15963 they describe the return type and the name of the function,
15964 but twisted together in a fashion that parallels the syntax of C.
15966 This function creates a binding context for the function body
15967 as well as setting up the FUNCTION_DECL in current_function_decl.
15969 Returns a FUNCTION_DECL on success.
15971 If the DECLARATOR is not suitable for a function (it defines a datum
15972 instead), we return 0, which tells yyparse to report a parse error.
15974 May return void_type_node indicating that this method is actually
15975 a friend. See grokfield for more details.
15977 Came here with a `.pushlevel' .
15979 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
15980 CHANGES TO CODE IN `grokfield'. */
15982 tree
15985 {
15993 {
15996 }
16001 /* Pass friends other than inline friend functions back. */
16006 {
16011 }
16020 /* We process method specializations in finish_struct_1. */
16022 {
16026 }
16029 {
16031 {
16034 }
16035 }
16041 }
16042 \f
16044 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
16045 we can lay it out later, when and if its type becomes complete.
16047 Also handle constexpr variables where the initializer involves
16048 an unlowered PTRMEM_CST because the class isn't complete yet. */
16050 void
16052 {
16055 /* Keep track of variables with incomplete types. */
16058 {
16066 /* RTTI TD entries are created while defining the type_info. */
16069 {
16072 }
16076 {
16077 /* When the outermost open class is complete we can resolve any
16078 pointers-to-members. */
16082 }
16083 }
16084 }
16086 /* Called when a class type (given by TYPE) is defined. If there are
16087 any existing VAR_DECLs whose type has been completed by this
16088 declaration, update them now. */
16090 void
16092 {
16097 {
16099 {
16106 {
16107 /* Complete the type of the variable. The VAR_DECL itself
16108 will be laid out in expand_expr. */
16111 }
16113 /* Remove this entry from the list. */
16115 }
16116 else
16117 ix++;
16118 }
16120 /* Check for pending declarations which may have abstract type. */
16122 }
16124 /* If DECL is of a type which needs a cleanup, build and return an
16125 expression to perform that cleanup here. Return NULL_TREE if no
16126 cleanup need be done. DECL can also be a _REF when called from
16127 split_nonconstant_init_1. */
16129 tree
16131 {
16132 tree type;
16133 tree attr;
16134 tree cleanup;
16136 /* Assume no cleanup is required. */
16142 /* Handle "__attribute__((cleanup))". We run the cleanup function
16143 before the destructor since the destructor is what actually
16144 terminates the lifetime of the object. */
16147 else
16150 {
16151 tree id;
16152 tree fn;
16153 tree arg;
16155 /* Get the name specified by the user for the cleanup function. */
16157 /* Look up the name to find the cleanup function to call. It is
16158 important to use lookup_name here because that is what is
16159 used in c-common.c:handle_cleanup_attribute when performing
16160 initial checks on the attribute. Note that those checks
16161 include ensuring that the function found is not an overloaded
16162 function, or an object with an overloaded call operator,
16163 etc.; we can rely on the fact that the function found is an
16164 ordinary FUNCTION_DECL. */
16172 }
16173 /* Handle ordinary C++ destructors. */
16176 {
16178 tree addr;
16179 tree call;
16183 else
16194 else
16196 }
16198 /* build_delete sets the location of the destructor call to the
16199 current location, even though the destructor is going to be
16200 called later, at the end of the current scope. This can lead to
16201 a "jumpy" behavior for users of debuggers when they step around
16202 the end of the block. So let's unset the location of the
16203 destructor call instead. */
16209 /* Treat objects with destructors as used; the destructor may do
16210 something substantive. */
16215 }
16217 \f
16218 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
16219 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
16220 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
16222 tree
16224 {
16225 tree fntype;
16226 tree args;
16240 fntype = (cp_build_type_attribute_variant
16242 fntype = (build_exception_variant
16247 }
16249 /* DECL was originally constructed as a non-static member function,
16250 but turned out to be static. Update it accordingly. */
16252 void
16254 {
16267 }
16269 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
16270 one of the language-independent trees. */
16272 enum cp_tree_node_structure_enum
16274 {
16276 {
16293 }
16294 }
16296 /* Build the void_list_node (void_type_node having been created). */
16297 tree
16299 {
16302 }
16304 bool
16306 {
16307 /* A missing noreturn is ok for the `main' function. */
16309 }
16311 /* Return the decl used to identify the COMDAT group into which DECL should
16312 be placed. */
16314 tree
16316 {
16317 /* Virtual tables, construction virtual tables, and virtual table
16318 tables all go in a single COMDAT group, named after the primary
16319 virtual table. */
16322 /* For all other DECLs, the COMDAT group is the mangled name of the
16323 declaration itself. */
16324 else
16325 {
16327 {
16328 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
16329 into the same section as the target function. In that case
16330 we must return target's name. */
16336 else
16338 }
16339 }
16342 }
16344 /* Returns the return type for FN as written by the user, which may include
16345 a placeholder for a deduced return type. */
16347 tree
16349 {
16352 {
16359 }
16361 }
16363 /* Returns true iff DECL is a variable or function declared with an auto type
16364 that has not yet been deduced to a real type. */
16366 bool
16368 {
16374 }
16376 /* Complain if DECL has an undeduced return type. */
16378 bool
16380 {
16382 {
16386 }
16388 }