| blob | 6ba657801d9a9f752aa687cd43d93f7a530a1001 |
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 };
97 static tree check_special_function_return_type
105 /* The following symbols are subsumed in the cp_global_trees array, and
106 listed here individually for documentation purposes.
108 C++ extensions
109 tree wchar_decl_node;
111 tree vtable_entry_type;
112 tree delta_type_node;
113 tree __t_desc_type_node;
115 tree class_type_node;
116 tree unknown_type_node;
118 Array type `vtable_entry_type[]'
120 tree vtbl_type_node;
121 tree vtbl_ptr_type_node;
123 Namespaces,
125 tree std_node;
126 tree abi_node;
128 A FUNCTION_DECL which can call `abort'. Not necessarily the
129 one that the user will declare, but sufficient to be called
130 by routines that want to abort the program.
132 tree abort_fndecl;
134 Used by RTTI
135 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
136 tree tinfo_var_id; */
140 #define local_names cp_function_chain->x_local_names
142 /* A list of objects which have constructors or destructors
143 which reside in the global scope. The decl is stored in
144 the TREE_VALUE slot and the initializer is stored
145 in the TREE_PURPOSE slot. */
146 tree static_aggregates;
148 /* Like static_aggregates, but for thread_local variables. */
149 tree tls_aggregates;
151 /* -- end of C++ */
153 /* A node for the integer constant 2. */
155 tree integer_two_node;
157 /* vector of static decls. */
160 /* vector of keyed classes. */
163 /* Used only for jumps to as-yet undefined labels, since jumps to
164 defined labels can have their validity checked immediately. */
168 /* The binding level to which this entry is *currently* attached.
169 This is initially the binding level in which the goto appeared,
170 but is modified as scopes are closed. */
172 /* The head of the names list that was current when the goto appeared,
173 or the inner scope popped. These are the decls that will *not* be
174 skipped when jumping to the label. */
175 tree names_in_scope;
176 /* The location of the goto, for error reporting. */
177 location_t o_goto_locus;
178 /* True if an OpenMP structured block scope has been closed since
179 the goto appeared. This means that the branch from the label will
180 illegally exit an OpenMP scope. */
182 };
184 /* A list of all LABEL_DECLs in the function that have names. Here so
185 we can clear out their names' definitions at the end of the
186 function, and so we can check the validity of jumps to these labels. */
196 /* The binding level to which the label is *currently* attached.
197 This is initially set to the binding level in which the label
198 is defined, but is modified as scopes are closed. */
201 /* The head of the names list that was current when the label was
202 defined, or the inner scope popped. These are the decls that will
203 be skipped when jumping to the label. */
204 tree names_in_scope;
206 /* A vector of all decls from all binding levels that would be
207 crossed by a backward branch to the label. */
210 /* A list of uses of the label, before the label is defined. */
213 /* The following bits are set after the label is defined, and are
214 updated as scopes are popped. They indicate that a jump to the
215 label will illegally enter a scope of the given flavor. */
221 };
223 #define named_labels cp_function_chain->x_named_labels
224 \f
225 /* The number of function bodies which we are currently processing.
226 (Zero if we are at namespace scope, one inside the body of a
227 function, two inside the body of a function in a local class, etc.) */
230 /* Whether the exception-specifier is part of a function type (i.e. C++17). */
233 /* States indicating how grokdeclarator() should handle declspecs marked
234 with __attribute__((deprecated)). An object declared as
235 __attribute__((deprecated)) suppresses warnings of uses of other
236 deprecated items. */
239 \f
240 /* A list of VAR_DECLs whose type was incomplete at the time the
241 variable was declared. */
244 tree decl;
245 tree incomplete_type;
246 };
250 \f
251 /* Returns the kind of template specialization we are currently
252 processing, given that it's declaration contained N_CLASS_SCOPES
253 explicit scope qualifications. */
255 tmpl_spec_kind
257 {
263 /* Scan through the template parameter scopes. */
267 {
268 /* If we see a specialization scope inside a parameter scope,
269 then something is wrong. That corresponds to a declaration
270 like:
272 template <class T> template <> ...
274 which is always invalid since [temp.expl.spec] forbids the
275 specialization of a class member template if the enclosing
276 class templates are not explicitly specialized as well. */
278 {
281 else
283 }
288 }
290 /* Handle explicit instantiations. */
292 {
294 /* We've seen a template parameter list during an explicit
295 instantiation. For example:
297 template <class T> template void f(int);
299 This is erroneous. */
301 else
303 }
306 /* We've not seen enough template headers to match all the
307 specialized classes present. For example:
309 template <class T> void R<T>::S<T>::f(int);
311 This is invalid; there needs to be one set of template
312 parameters for each class. */
315 /* We're processing a non-template declaration (even though it may
316 be a member of a template class.) For example:
318 template <class T> void S<T>::f(int);
320 The `class T' matches the `S<T>', leaving no template headers
321 corresponding to the `f'. */
324 /* We've got too many template headers. For example:
326 template <> template <class T> void f (T);
328 There need to be more enclosing classes. */
330 else
331 /* This must be a template. It's of the form:
333 template <class T> template <class U> void S<T>::f(U);
335 This is a specialization if the innermost level was a
336 specialization; otherwise it's just a definition of the
337 template. */
339 }
341 /* Exit the current scope. */
343 void
345 {
347 }
349 /* When a label goes out of scope, check to see if that label was used
350 in a valid manner, and issue any appropriate warnings or errors. */
352 static void
354 {
356 {
358 {
359 location_t location;
363 /* FIXME want (LOCATION_FILE (input_location), (line)0) */
364 /* Avoid crashing later. */
366 }
367 else
369 }
370 }
372 /* Helper function to sort named label entries in a vector by DECL_UID. */
374 static int
376 {
380 /* DECL_UIDs can never be equal. */
382 }
384 /* At the end of a function, all labels declared within the function
385 go out of scope. BLOCK is the top-level block for the
386 function. */
388 static void
390 {
394 /* We need to add the labels to the block chain, so debug
395 information is emitted. But, we want the order to be stable so
396 need to sort them first. Otherwise the debug output could be
397 randomly ordered. I guess it's mostly stable, unless the hash
398 table implementation changes. */
403 {
410 }
415 {
422 }
423 }
425 /* At the end of a block with local labels, restore the outer definition. */
427 static void
429 {
437 else
438 {
441 }
443 }
445 /* The following two routines are used to interface to Objective-C++.
446 The binding level is purposely treated as an opaque type. */
450 {
452 }
454 /* The following routine is used by the NeXT-style SJLJ exceptions;
455 variables get marked 'volatile' so as to not be clobbered by
456 _setjmp()/_longjmp() calls. All variables in the current scope,
457 as well as parent scopes up to (but not including) ENCLOSING_BLK
458 shall be thusly marked. */
460 void
462 {
468 {
469 tree decl;
474 /* Do not climb up past the current function. */
477 }
478 }
480 /* True if B is the level for the condition of a constexpr if. */
482 static bool
484 {
488 }
490 /* Update data for defined and undefined labels when leaving a scope. */
492 int
494 {
499 {
500 tree decl;
502 /* ENT->NAMES_IN_SCOPE may contain a mixture of DECLs and
503 TREE_LISTs representing OVERLOADs, so be careful. */
513 {
532 }
533 }
535 {
540 {
545 }
546 }
549 }
551 /* Saved errorcount to avoid -Wunused-but-set-{parameter,variable} warnings
552 when errors were reported, except for -Werror-unused-but-set-*. */
555 /* Exit a binding level.
556 Pop the level off, and restore the state of the identifier-decl mappings
557 that were in effect when this level was entered.
559 If KEEP == 1, this level had explicit declarations, so
560 and create a "block" (a BLOCK node) for the level
561 to record its declarations and subblocks for symbol table output.
563 If FUNCTIONBODY is nonzero, this level is the body of a function,
564 so create a block as if KEEP were set and also clear out all
565 label names.
567 If REVERSE is nonzero, reverse the order of decls before putting
568 them into the BLOCK. */
570 tree
572 {
573 tree link;
574 /* The chain of decls was accumulated in reverse order.
575 Put it into forward order, just for cleanliness. */
576 tree decls;
577 tree subblocks;
578 tree block;
579 tree decl;
581 scope_kind kind;
585 restart:
598 /* We used to use KEEP == 2 to indicate that the new block should go
599 at the beginning of the list of blocks at this binding level,
600 rather than the end. This hack is no longer used. */
606 /* Any uses of undefined labels, and any defined labels, now operate
607 under constraints of next binding contour. */
612 /* Get the decls in the order they were written.
613 Usually current_binding_level->names is in reverse order.
614 But parameter decls were previously put in forward order. */
618 {
621 }
623 /* If there were any declarations or structure tags in that level,
624 or if this level is a function body,
625 create a BLOCK to record them for the life of this function. */
627 /* Avoid function body block if possible. */
633 {
636 }
638 /* In each subblock, record that this is its superior. */
643 /* We still support the old for-scope rules, whereby the variables
644 in a init statement were in scope after the for-statement ended.
645 We only use the new rules if flag_new_for_scope is nonzero. */
646 leaving_for_scope
649 /* Before we remove the declarations first check for unused variables. */
654 {
655 /* There are cases where D itself is a TREE_LIST. See in
656 push_local_binding where the list of decls returned by
657 getdecls is built. */
664 /* For structured bindings, consider only real variables, not
665 subobjects. */
673 {
675 {
678 OPT_Wunused_variable,
680 else
683 }
685 // For -Wunused-but-set-variable leave references alone.
688 {
693 else
695 OPT_Wunused_but_set_variable,
698 }
699 }
700 }
702 /* Remove declarations for all the DECLs in this level. */
704 {
709 /* It's hard to make this ARM compatibility hack play nicely with
710 lambdas, and it really isn't necessary in C++11 mode. */
713 {
722 /* We have something like:
724 int i;
725 for (int i; ;);
727 and we are leaving the `for' scope. There's no reason to
728 keep the binding of the inner `i' in this case. */
729 ;
732 /* Here, we have something like:
734 typedef int I;
736 void f () {
737 for (int I; ;);
738 }
740 We must pop the for-scope binding so we know what's a
741 type and what isn't. */
742 ;
743 else
744 {
745 /* Mark this VAR_DECL as dead so that we can tell we left it
746 there only for backward compatibility. */
749 /* Keep track of what should have happened when we
750 popped the binding. */
752 {
755 }
757 /* Add it to the list of dead variables in the next
758 outermost binding to that we can remove these when we
759 leave that binding. */
762 link);
764 /* Although we don't pop the cxx_binding, we do clear
765 its SCOPE since the scope is going away now. */
769 /* Don't remove the binding. */
771 }
772 }
773 /* Remove the binding. */
776 else
778 }
780 /* Remove declarations for any `for' variables from inner scopes
781 that we kept around. */
786 /* Restore the IDENTIFIER_TYPE_VALUEs. */
791 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
792 list if a `using' declaration put them there. The debugging
793 back ends won't understand OVERLOAD, so we remove them here.
794 Because the BLOCK_VARS are (temporarily) shared with
795 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
796 popped all the bindings. Also remove undeduced 'auto' decls,
797 which LTO doesn't understand, and can't have been used by anything. */
799 {
803 {
805 || (!processing_template_decl
808 else
810 }
811 }
813 /* If the level being exited is the top level of a function,
814 check over all the labels. */
816 {
818 {
819 /* Since this is the top level block of a function, the vars are
820 the function's parameters. Don't leave them in the BLOCK
821 because they are found in the FUNCTION_DECL instead. */
824 }
825 else
827 }
831 {
832 tree stmt;
834 /* If this is a temporary binding created for a cleanup, then we'll
835 have pushed a statement list level. Pop that, create a new
836 BIND_EXPR for the block, and insert it into the stream. */
840 }
844 {
845 /* The current function is being defined, so its DECL_INITIAL
846 should be error_mark_node. */
850 {
852 {
855 }
856 else
858 }
859 }
861 current_binding_level->blocks
864 /* If we did not make a block for the level just exited,
865 any blocks made for inner levels
866 (since they cannot be recorded as subblocks in that level)
867 must be carried forward so they will later become subblocks
868 of something else. */
870 current_binding_level->blocks
873 /* Each and every BLOCK node created here in `poplevel' is important
874 (e.g. for proper debugging information) so if we created one
875 earlier, mark it as "used". */
879 /* All temporary bindings created for cleanups are popped silently. */
885 }
887 /* Call wrapup_globals_declarations for the globals in NAMESPACE. */
888 /* Diagnose odr-used extern inline variables without definitions
889 in the current TU. */
891 int
893 {
895 {
896 tree decl;
899 {
909 OPT_Wunused_function,
918 }
920 /* Clear out the list, so we don't rescan next time. */
923 /* Write out any globals that need to be output. */
926 }
928 }
929 \f
930 /* In C++, you don't have to write `struct S' to refer to `S'; you
931 can just use `S'. We accomplish this by creating a TYPE_DECL as
932 if the user had written `typedef struct S S'. Create and return
933 the TYPE_DECL for TYPE. */
935 tree
937 {
938 tree decl;
942 /* There are other implicit type declarations, like the one *within*
943 a class that allows you to write `S::S'. We must distinguish
944 amongst these. */
950 }
952 /* Remember a local name for name-mangling purposes. */
954 static void
956 {
966 {
969 {
974 else
980 }
981 }
985 }
986 \f
987 /* Subroutine of duplicate_decls: return truthvalue of whether
988 or not types of these decls match.
990 For C++, we must compare the parameter list so that `int' can match
991 `int&' in a parameter position, but `int&' is not confused with
992 `const int&'. */
994 int
996 {
1003 /* If the two DECLs are not even the same kind of thing, we're not
1004 interested in their types. */
1010 {
1015 tree r2;
1017 /* Specializations of different templates are different functions
1018 even if they have the same type. */
1033 /* A new declaration doesn't match a built-in one unless it
1034 is also extern "C". */
1042 /* A declaration with deduced return type should use its pre-deduction
1043 type for declaration matching. */
1047 {
1050 #ifndef NO_IMPLICIT_EXTERN_C
1053 #endif
1054 ))
1055 {
1059 }
1060 #ifndef NO_IMPLICIT_EXTERN_C
1068 {
1071 }
1072 #endif
1073 else
1074 types_match =
1080 }
1081 else
1084 /* The decls dont match if they correspond to two different versions
1085 of the same function. Disallow extern "C" functions to be
1086 versions for now. */
1090 && record_versions
1093 }
1095 {
1109 else
1110 // We don't need to check equivalently_constrained for variable and
1111 // function templates because we check it on the results.
1113 }
1114 else
1115 {
1116 /* Need to check scope for variable declaration (VAR_DECL).
1117 For typedef (TYPE_DECL), scope is ignored. */
1120 /* [dcl.link]
1121 Two declarations for an object with C language linkage
1122 with the same name (ignoring the namespace that qualify
1123 it) that appear in different namespace scopes refer to
1124 the same object. */
1134 else
1137 COMPARE_REDECLARATION);
1138 }
1140 // Normal functions can be constrained, as can variable partial
1141 // specializations.
1146 }
1148 /* NEWDECL and OLDDECL have identical signatures. If they are
1149 different versions adjust them and return true. */
1151 bool
1153 {
1160 {
1165 }
1168 {
1173 }
1175 /* Only record if at least one was not already versions. */
1180 }
1182 /* If NEWDECL is `static' and an `extern' was seen previously,
1183 warn about it. OLDDECL is the previous declaration.
1185 Note that this does not apply to the C++ case of declaring
1186 a variable `extern const' and then later `const'.
1188 Don't complain about built-in functions, since they are beyond
1189 the user's control. */
1191 void
1193 {
1200 /* Don't get confused by static member functions; that's a different
1201 use of `static'. */
1206 /* If the old declaration was `static', or the new one isn't, then
1207 everything is OK. */
1211 /* It's OK to declare a builtin function as `static'. */
1220 }
1222 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1223 function templates. If their exception specifications do not
1224 match, issue a diagnostic. */
1226 static void
1228 tree old_decl)
1229 {
1233 /* Two default specs are equivalent, don't force evaluation. */
1243 /* [except.spec]
1245 If any declaration of a function has an exception-specification,
1246 all declarations, including the definition and an explicit
1247 specialization, of that function shall have an
1248 exception-specification with the same set of type-ids. */
1251 {
1259 /* We used to silently permit mismatched eh specs with
1260 -fno-exceptions, so make them a pedwarn now. */
1262 else
1267 }
1268 }
1270 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1271 Otherwise issue diagnostics. */
1273 static bool
1275 {
1285 {
1287 {
1288 /* Hide a built-in declaration. */
1292 }
1293 /* 7.1.5 [dcl.constexpr]
1294 Note: An explicit specialization can differ from the template
1295 declaration with respect to the constexpr specifier. */
1301 "redeclaration %qD differs in %<constexpr%> "
1306 }
1308 }
1310 // If OLDDECL and NEWDECL are concept declarations with the same type
1311 // (i.e., and template parameters), but different requirements,
1312 // emit diagnostics and return true. Otherwise, return false.
1315 {
1327 {
1332 {
1335 }
1336 }
1338 }
1340 /* DECL is a redeclaration of a function or function template. If
1341 it does have default arguments issue a diagnostic. Note: this
1342 function is used to enforce the requirements in C++11 8.3.6 about
1343 no default arguments in redeclarations. */
1345 static void
1347 {
1353 {
1355 "redeclaration of %q#D may not have default "
1358 }
1359 }
1361 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1363 DECL_ATTRIBUTES (fn)))
1365 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1366 If the redeclaration is invalid, a diagnostic is issued, and the
1367 error_mark_node is returned. Otherwise, OLDDECL is returned.
1369 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1370 returned.
1372 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1374 tree
1376 {
1380 tree new_template_info;
1387 /* If either the type of the new decl or the type of the old decl is an
1388 error_mark_node, then that implies that we have already issued an
1389 error (earlier) for some bogus type specification, and in that case,
1390 it is rather pointless to harass the user with yet more error message
1391 about the same declaration, so just pretend the types match here. */
1398 {
1409 }
1415 {
1419 else
1422 }
1424 /* Check for redeclaration and other discrepancies. */
1427 {
1430 {
1431 /* Avoid warnings redeclaring built-ins which have not been
1432 explicitly declared. */
1434 {
1438 OPT_Wbuiltin_declaration_mismatch,
1440 newdecl);
1442 }
1444 /* If you declare a built-in or predefined function name as static,
1445 the old definition is overridden, but optionally warn this was a
1446 bad choice of name. */
1448 {
1453 /* Discard the old built-in function. */
1455 }
1456 /* If the built-in is not ansi, then programs can override
1457 it even globally without an error. */
1462 else
1466 }
1468 {
1475 }
1477 {
1478 /* Avoid warnings redeclaring built-ins which have not been
1479 explicitly declared. */
1481 {
1484 /* A new declaration doesn't match a built-in one unless it
1485 is also extern "C". */
1495 {
1498 /* FILE, tm types are not known at the time
1499 we create the builtins. */
1505 {
1512 {
1520 newdecl_is_friend);
1522 }
1524 }
1528 next_arg:;
1529 }
1532 OPT_Wbuiltin_declaration_mismatch,
1533 "declaration of %q#D conflicts with built-in "
1535 }
1540 {
1541 /* A near match; override the builtin. */
1545 OPT_Wbuiltin_declaration_mismatch,
1546 "new declaration %q#D ambiguates built-in "
1548 else
1553 }
1554 else
1555 /* Discard the old built-in function. */
1558 /* Replace the old RTL to avoid problems with inlining. */
1560 }
1561 /* Even if the types match, prefer the new declarations type for
1562 built-ins which have not been explicitly declared, for
1563 exception lists, etc... */
1565 {
1572 }
1574 /* If a function is explicitly declared "throw ()", propagate that to
1575 the corresponding builtin. */
1580 {
1585 }
1587 /* Whether or not the builtin can throw exceptions has no
1588 bearing on this declarator. */
1592 {
1593 /* If a builtin function is redeclared as `static', merge
1594 the declarations, but make the original one static. */
1598 /* Make the old declaration consistent with the new one so
1599 that all remnants of the builtin-ness of this function
1600 will be banished. */
1603 }
1604 }
1606 {
1607 /* C++ Standard, 3.3, clause 4:
1608 "[Note: a namespace name or a class template name must be unique
1609 in its declarative region (7.3.2, clause 14). ]" */
1616 {
1621 {
1622 /* We do nothing special here, because C++ does such nasty
1623 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1624 get shadowed, and know that if we need to find a TYPE_DECL
1625 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1626 slot of the identifier. */
1628 }
1635 }
1644 }
1646 {
1648 /* These are certainly not duplicate declarations; they're
1649 from different scopes. */
1653 {
1654 /* The name of a class template may not be declared to refer to
1655 any other template, class, function, object, namespace, value,
1656 or type in the same scope. */
1659 {
1664 }
1671 /* Template functions can be disambiguated by
1672 return type. */
1675 // Template functions can also be disambiguated by
1676 // constraints.
1678 {
1682 }
1686 }
1688 {
1690 {
1692 newdecl);
1696 }
1697 /* For function versions, params and types match, but they
1698 are not ambiguous. */
1701 // The functions have the same parameter types.
1704 // And the same constraints.
1706 {
1711 }
1712 else
1714 }
1715 else
1716 {
1721 }
1722 }
1732 /* It's OK to have a template specialization and a non-template
1733 with the same type, or to have specializations of two
1734 different templates with the same type. Note that if one is a
1735 specialization, and the other is an instantiation of the same
1736 template, that we do not exit at this point. That situation
1737 can occur if we instantiate a template class, and then
1738 specialize one of its methods. This situation is valid, but
1739 the declarations must be merged in the usual way. */
1746 /* One of the declarations is a template instantiation, and the
1747 other is not a template at all. That's OK. */
1750 {
1751 /* In [namespace.alias] we have:
1753 In a declarative region, a namespace-alias-definition can be
1754 used to redefine a namespace-alias declared in that declarative
1755 region to refer only to the namespace to which it already
1756 refers.
1758 Therefore, if we encounter a second alias directive for the same
1759 alias, we can just ignore the second directive. */
1765 /* Leave it to update_binding to merge or report error. */
1767 }
1768 else
1769 {
1772 {
1780 }
1785 {
1786 /* Prototype decl follows defn w/o prototype. */
1791 }
1794 {
1795 /* [dcl.link]
1796 If two declarations of the same function or object
1797 specify different linkage-specifications ..., the program
1798 is ill-formed.... Except for functions with C++ linkage,
1799 a function declaration without a linkage specification
1800 shall not precede the first linkage specification for
1801 that function. A function can be declared without a
1802 linkage specification after an explicit linkage
1803 specification has been seen; the linkage explicitly
1804 specified in the earlier declaration is not affected by
1805 such a function declaration.
1807 DR 563 raises the question why the restrictions on
1808 functions should not also apply to objects. Older
1809 versions of G++ silently ignore the linkage-specification
1810 for this example:
1812 namespace N {
1813 extern int i;
1814 extern "C" int i;
1815 }
1817 which is clearly wrong. Therefore, we now treat objects
1818 like functions. */
1820 {
1821 /* There is no explicit linkage-specification, so we use
1822 the linkage from the previous declaration. */
1825 }
1826 else
1827 {
1833 }
1834 }
1837 ;
1839 {
1840 /* Note: free functions, as TEMPLATE_DECLs, are handled below. */
1843 as FUNCTION_DECLs. */
1845 /* C++11 8.3.6/6.
1846 Default arguments for a member function of a class
1847 template shall be specified on the initial declaration
1848 of the member function within the class template. */
1851 else
1852 {
1860 {
1863 {
1865 "default argument given for parameter "
1869 olddecl);
1870 }
1871 else
1872 {
1877 olddecl);
1878 }
1879 }
1880 }
1881 }
1882 }
1884 /* Do not merge an implicit typedef with an explicit one. In:
1886 class A;
1887 ...
1888 typedef class A A __attribute__ ((foo));
1890 the attribute should apply only to the typedef. */
1896 /* If new decl is `static' and an `extern' was seen previously,
1897 warn about it. */
1903 /* We have committed to returning 1 at this point. */
1905 {
1906 /* Now that functions must hold information normally held
1907 by field decls, there is extra work to do so that
1908 declaration information does not get destroyed during
1909 definition. */
1927 /* Optionally warn about more than one declaration for the same
1928 name, but don't warn about a function declaration followed by a
1929 definition. */
1932 /* Don't warn about extern decl followed by definition. */
1934 /* Don't warn about friends, let add_friend take care of it. */
1936 /* Don't warn about declaration followed by specialization. */
1939 {
1941 OPT_Wredundant_decls,
1943 newdecl))
1946 }
1950 {
1952 {
1956 }
1958 }
1959 }
1961 /* Deal with C++: must preserve virtual function table size. */
1963 {
1973 }
1975 /* Copy all the DECL_... slots specified in the new decl
1976 except for any that we copy here from the old type. */
1981 {
1987 {
1990 }
1991 }
1994 {
1995 tree old_result;
1996 tree new_result;
2008 {
2009 /* Per C++11 8.3.6/4, default arguments cannot be added in later
2010 declarations of a function template. */
2019 {
2022 else
2034 }
2035 else
2036 {
2042 }
2043 }
2045 /* If the new declaration is a definition, update the file and
2046 line information on the declaration, and also make
2047 the old declaration the same definition. */
2049 {
2055 {
2056 tree parm;
2062 }
2063 }
2066 }
2069 {
2073 /* Automatically handles default parameters. */
2075 tree newtype;
2077 /* For typedefs use the old type, as the new type's DECL_NAME points
2078 at newdecl, which will be ggc_freed. */
2080 {
2081 /* But NEWTYPE might have an attribute, honor that. */
2086 {
2090 }
2092 /* And remove the new type from the variants list. */
2094 {
2099 {
2102 }
2103 }
2104 }
2105 else
2106 /* Merge the data types specified in the two decls. */
2110 {
2112 /* For already initialized vars, TREE_READONLY could have been
2113 cleared in cp_finish_decl, because the var needs runtime
2114 initialization or destruction. Make sure not to set
2115 TREE_READONLY on it again. */
2131 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
2134 {
2135 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
2138 }
2139 }
2141 /* An explicit specialization of a function template or of a member
2142 function of a class template can be declared transaction_safe
2143 independently of whether the corresponding template entity is declared
2144 transaction_safe. */
2157 /* Lay the type out, unless already done. */
2171 /* Merge the type qualifiers. */
2179 /* Merge deprecatedness. */
2183 /* Preserve function specific target and optimization options */
2185 {
2195 }
2197 /* Merge the initialization information. */
2200 {
2204 {
2207 }
2208 }
2211 {
2223 /* Keep the old RTL. */
2225 }
2228 {
2229 /* Keep the old RTL. We cannot keep the old RTL if the old
2230 declaration was for an incomplete object and the new
2231 declaration is not since many attributes of the RTL will
2232 change. */
2234 }
2235 }
2236 /* If cannot merge, then use the new type and qualifiers,
2237 and don't preserve the old rtl. */
2238 else
2239 {
2240 /* Clean out any memory we had of the old declaration. */
2250 }
2252 /* Merge the storage class information. */
2265 {
2274 {
2281 }
2284 {
2288 }
2293 /* If the OLDDECL is an instantiation and/or specialization,
2294 then the NEWDECL must be too. But, it may not yet be marked
2295 as such if the caller has created NEWDECL, but has not yet
2296 figured out that it is a redeclaration. */
2300 /* Don't really know how much of the language-specific
2301 values we should copy from old to new. */
2308 {
2312 {
2316 /* Remember the presence of explicit specialization args. */
2319 }
2321 }
2322 /* Only functions have these fields. */
2324 {
2329 /* DECL_THUNKS is only valid for virtual functions,
2330 otherwise it is a DECL_FRIEND_CONTEXT. */
2333 }
2334 /* Only variables have this field. */
2338 }
2341 {
2342 tree parm;
2344 /* Merge parameter attributes. */
2353 }
2357 {
2358 /* If newdecl is not a specialization, then it is not a
2359 template-related function at all. And that means that we
2360 should have exited above, returning 0. */
2364 /* From [temp.expl.spec]:
2366 If a template, a member template or the member of a class
2367 template is explicitly specialized then that
2368 specialization shall be declared before the first use of
2369 that specialization that would cause an implicit
2370 instantiation to take place, in every translation unit in
2371 which such a use occurs. */
2373 olddecl);
2379 /* Don't propagate visibility from the template to the
2380 specialization here. We'll do that in determine_visibility if
2381 appropriate. */
2384 /* [temp.expl.spec/14] We don't inline explicit specialization
2385 just because the primary template says so. */
2387 /* But still keep DECL_DISREGARD_INLINE_LIMITS in sync with
2388 the always_inline attribute. */
2391 {
2394 else
2398 }
2399 }
2401 {
2402 /* Never inline re-defined extern inline functions.
2403 FIXME: this could be better handled by keeping both
2404 function as separate declarations. */
2406 }
2407 else
2408 {
2410 {
2414 }
2416 ;
2430 }
2432 /* Preserve abstractness on cloned [cd]tors. */
2435 /* Update newdecl's parms to point at olddecl. */
2441 {
2445 }
2447 {
2448 /* These need to be copied so that the names are available.
2449 Note that if the types do match, we'll preserve inline
2450 info and other bits, but if not, we won't. */
2453 }
2454 /* If redeclaring a builtin function, it stays built in
2455 if newdecl is a gnu_inline definition, or if newdecl is just
2456 a declaration. */
2459 {
2462 /* If we're keeping the built-in definition, keep the rtl,
2463 regardless of declaration matches. */
2466 {
2469 {
2470 /* If a compatible prototype of these builtin functions
2471 is seen, assume the runtime implements it with the
2472 expected semantics. */
2481 }
2482 }
2485 }
2487 /* If defining a function declared with other language
2488 linkage, use the previously declared language linkage. */
2491 {
2493 /* Don't clear out the arguments if we're just redeclaring a
2494 function. */
2497 }
2498 }
2502 /* Now preserve various other info from the definition. */
2508 /* Warn about conflicting visibility specifications. */
2512 {
2514 "%qD: visibility attribute ignored because it "
2518 }
2519 /* Choose the declaration which specified visibility. */
2521 {
2524 }
2525 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2526 so keep this behavior. */
2528 {
2531 }
2532 /* Likewise for DECL_ALIGN, DECL_USER_ALIGN and DECL_PACKED. */
2534 {
2537 }
2546 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2547 with that from NEWDECL below. */
2549 {
2553 }
2555 /* Merge the USED information. */
2561 {
2566 }
2572 /* Merge the DECL_FUNCTION_VERSIONED information. newdecl will be copied
2573 to olddecl and deleted. */
2576 {
2577 /* Set the flag for newdecl so that it gets copied to olddecl. */
2579 /* newdecl will be purged after copying to olddecl and is no longer
2580 a version. */
2582 }
2585 {
2599 /* Preserve symtab node mapping. */
2603 /* If newdecl is a template instantiation, it is possible that
2604 the following sequence of events has occurred:
2606 o A friend function was declared in a class template. The
2607 class template was instantiated.
2609 o The instantiation of the friend declaration was
2610 recorded on the instantiation list, and is newdecl.
2612 o Later, however, instantiate_class_template called pushdecl
2613 on the newdecl to perform name injection. But, pushdecl in
2614 turn called duplicate_decls when it discovered that another
2615 declaration of a global function with the same name already
2616 existed.
2618 o Here, in duplicate_decls, we decided to clobber newdecl.
2620 If we're going to do that, we'd better make sure that
2621 olddecl, and not newdecl, is on the list of
2622 instantiations so that if we try to do the instantiation
2623 again we won't get the clobbered declaration. */
2625 new_template_info,
2626 olddecl);
2627 }
2628 else
2629 {
2636 {
2644 {
2657 }
2665 }
2666 }
2669 {
2673 {
2674 /* Merge the section attribute.
2675 We want to issue an error if the sections conflict but that must be
2676 done later in decl_attributes since we are called before attributes
2677 are assigned. */
2682 {
2686 else
2690 }
2691 }
2695 {
2699 }
2700 }
2706 {
2709 }
2711 /* NEWDECL contains the merged attribute lists.
2712 Update OLDDECL to be the same. */
2715 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2716 so that encode_section_info has a chance to look at the new decl
2717 flags and attributes. */
2724 /* The NEWDECL will no longer be needed. Because every out-of-class
2725 declaration of a member results in a call to duplicate_decls,
2726 freeing these nodes represents in a significant savings.
2728 Before releasing the node, be sore to remove function from symbol
2729 table that might have been inserted there to record comdat group.
2730 Be sure to however do not free DECL_STRUCT_FUNCTION because this
2731 structure is shared in between newdecl and oldecl. */
2735 {
2739 }
2741 /* Remove the associated constraints for newdecl, if any, before
2742 reclaiming memory. */
2749 }
2750 \f
2751 /* Return zero if the declaration NEWDECL is valid
2752 when the declaration OLDDECL (assumed to be for the same name)
2753 has already been seen.
2754 Otherwise return an error message format string with a %s
2755 where the identifier should go. */
2759 {
2761 {
2762 /* Because C++ can put things into name space for free,
2763 constructs like "typedef struct foo { ... } foo"
2764 would look like an erroneous redeclaration. */
2767 else
2769 }
2771 {
2772 /* If this is a pure function, its olddecl will actually be
2773 the original initialization to `0' (which we force to call
2774 abort()). Don't complain about redefinition in this case. */
2779 /* If both functions come from different namespaces, this is not
2780 a redeclaration - this is a conflict with a used function. */
2786 /* We'll complain about linkage mismatches in
2787 warn_extern_redeclared_static. */
2789 /* Defining the same name twice is no good. */
2792 {
2798 }
2801 {
2806 {
2810 else
2813 }
2814 }
2816 check_abi_tag_redeclaration
2821 }
2823 {
2827 {
2832 }
2850 {
2855 {
2859 else
2862 }
2863 }
2865 /* Core issue #226 (C++0x):
2867 If a friend function template declaration specifies a
2868 default template-argument, that declaration shall be a
2869 definition and shall be the only declaration of the
2870 function template in the translation unit. */
2881 }
2887 {
2888 /* Only variables can be thread-local, and all declarations must
2889 agree on this property. */
2893 else
2896 }
2898 {
2899 /* The objects have been declared at namespace scope. If either
2900 is a member of an anonymous union, then this is an invalid
2901 redeclaration. For example:
2903 int i;
2904 union { int i; };
2906 is invalid. */
2910 /* If at least one declaration is a reference, there is no
2911 conflict. For example:
2913 int i = 3;
2914 extern int i;
2916 is valid. */
2920 /* Static data member declared outside a class definition
2921 if the variable is defined within the class with constexpr
2922 specifier is declaration rather than definition (and
2923 deprecated). */
2928 {
2930 /* For now, only warn with explicit -Wdeprecated. */
2933 "redundant redeclaration of %<constexpr%> static "
2938 }
2940 /* Reject two definitions. */
2942 }
2943 else
2944 {
2945 /* Objects declared with block scope: */
2946 /* Reject two definitions, and reject a definition
2947 together with an external reference. */
2951 }
2952 }
2953 \f
2955 /* Hash and equality functions for the named_label table. */
2957 hashval_t
2959 {
2961 }
2963 bool
2965 {
2967 }
2969 /* Look for a label named ID in the current function. If one cannot
2970 be found, create one. Return the named_label_entry, or NULL on
2971 failure. */
2975 {
2976 /* You can't use labels at global scope. */
2978 {
2981 }
2987 named_label_entry **slot
2992 {
2997 {
3001 }
3002 }
3004 /* We are making a new decl, create or reuse the named_label_entry */
3008 else
3009 {
3014 }
3016 /* Now create the LABEL_DECL. */
3022 {
3026 }
3031 }
3033 /* Wrapper for lookup_label_1. */
3035 tree
3037 {
3042 }
3044 tree
3046 {
3051 }
3053 /* Returns nonzero if it is ill-formed to jump past the declaration of
3054 DECL. Returns 2 if it's also a real problem. */
3056 static int
3058 {
3059 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
3060 with automatic storage duration is not in scope to a point where it is
3061 in scope is ill-formed unless the variable has scalar type, class type
3062 with a trivial default constructor and a trivial destructor, a
3063 cv-qualified version of one of these types, or an array of one of the
3064 preceding types and is declared without an initializer (8.5). */
3079 }
3081 /* A subroutine of check_previous_goto_1 and check_goto to identify a branch
3082 to the user. */
3084 static bool
3086 diagnostic_t diag_kind)
3087 {
3088 bool complained
3095 }
3097 /* Check that a single previously seen jump to a newly defined label
3098 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
3099 the jump context; NAMES are the names in scope in LEVEL at the jump
3100 context; LOCUS is the source position of the jump or 0. Returns
3101 true if all is well. */
3103 static bool
3106 {
3113 {
3119 }
3122 {
3128 {
3134 {
3136 DK_PERMERROR);
3138 }
3140 {
3144 else
3146 " enters scope of %q#D, which has "
3148 }
3149 }
3157 {
3184 {
3188 }
3193 }
3196 {
3202 }
3203 }
3206 }
3208 static void
3210 {
3214 }
3216 static bool
3218 {
3220 }
3222 /* Check that a new jump to a label DECL is OK. Called by
3223 finish_goto_stmt. */
3225 void
3227 {
3228 /* We can't know where a computed goto is jumping.
3229 So we assume that it's OK. */
3233 /* We didn't record any information about this label when we created it,
3234 and there's not much point since it's trivial to analyze as a return. */
3239 named_label_entry **slot
3243 /* If the label hasn't been defined yet, defer checking. */
3245 {
3246 /* Don't bother creating another use if the last goto had the
3247 same data, and will therefore create the same set of errors. */
3252 named_label_use_entry *new_use
3262 }
3266 tree bad;
3272 {
3280 }
3283 {
3287 {
3288 /* Can't skip init of __exception_info. */
3290 {
3294 }
3298 }
3300 {
3304 else
3306 " enters scope of %q#D which has "
3308 }
3309 }
3312 {
3321 }
3324 {
3327 }
3330 {
3334 {
3336 {
3341 }
3345 }
3346 }
3347 }
3349 /* Check that a return is ok wrt OpenMP structured blocks.
3350 Called by finish_return_stmt. Returns true if all is well. */
3352 bool
3354 {
3357 {
3360 }
3364 }
3366 /* Define a label, specifying the location in the source file.
3367 Return the LABEL_DECL node for the label. */
3369 static tree
3371 {
3372 /* After labels, make any new cleanups in the function go into their
3373 own new (temporary) binding contour. */
3383 {
3386 }
3387 else
3388 {
3389 /* Mark label as having been defined. */
3391 /* Say where in the source. */
3400 }
3403 }
3405 /* Wrapper for define_label_1. */
3407 tree
3409 {
3414 }
3417 struct cp_switch
3418 {
3421 /* The SWITCH_STMT being built. */
3422 tree switch_stmt;
3423 /* A splay-tree mapping the low element of a case range to the high
3424 element, or NULL_TREE if there is no high element. Used to
3425 determine whether or not a new case label duplicates an old case
3426 label. We need a tree, rather than simply a hash table, because
3427 of the GNU case range extension. */
3428 splay_tree cases;
3429 /* Remember whether there was a case value that is outside the
3430 range of the original type of the controlling expression. */
3432 /* Remember whether a default: case label has been seen. */
3434 /* Remember whether a BREAK_STMT has been seen in this SWITCH_STMT. */
3436 /* Set if inside of {FOR,DO,WHILE}_BODY nested inside of a switch,
3437 where BREAK_STMT doesn't belong to the SWITCH_STMT. */
3439 };
3441 /* A stack of the currently active switch statements. The innermost
3442 switch statement is on the top of the stack. There is no need to
3443 mark the stack for garbage collection because it is only active
3444 during the processing of the body of a function, and we never
3445 collect at that point. */
3449 /* Called right after a switch-statement condition is parsed.
3450 SWITCH_STMT is the switch statement being parsed. */
3452 void
3454 {
3465 }
3467 void
3469 {
3471 location_t switch_location;
3473 /* Emit warnings as needed. */
3475 const bool bool_cond_p
3484 /* For the benefit of block_may_fallthru remember if the switch body
3485 case labels cover all possible values and if there are break; stmts. */
3487 || (!processing_template_decl
3497 }
3499 /* Note that a BREAK_STMT is about to be added. If it is inside of
3500 a SWITCH_STMT and not inside of a loop body inside of it, note
3501 in switch_stack we've seen a BREAK_STMT. */
3503 void
3505 {
3508 }
3510 /* Note the start of processing of an iteration statement's body.
3511 The note_break_stmt function will do nothing while processing it.
3512 Return a flag that should be passed to note_iteration_stmt_body_end. */
3514 bool
3516 {
3522 }
3524 /* Note the end of processing of an iteration statement's body. */
3526 void
3528 {
3531 }
3533 /* Convert a case constant VALUE in a switch to the type TYPE of the switch
3534 condition. Note that if TYPE and VALUE are already integral we don't
3535 really do the conversion because the language-independent
3536 warning/optimization code will work better that way. */
3538 static tree
3540 {
3547 {
3550 value = (perform_implicit_conversion_flags
3553 }
3555 }
3557 /* Note that we've seen a definition of a case label, and complain if this
3558 is a bad place for one. */
3560 tree
3562 {
3565 tree type;
3571 {
3572 tree label;
3574 /* For templates, just add the case label; we'll do semantic
3575 analysis at instantiation-time. */
3578 }
3580 /* Find the condition on which this switch statement depends. */
3597 /* After labels, make any new cleanups in the function go into their
3598 own new (temporary) binding contour. */
3605 }
3606 \f
3608 tree scope;
3609 tree name;
3610 tree template_id;
3613 };
3616 {
3619 /* Hash a TYPENAME_TYPE. */
3621 static hashval_t
3623 {
3624 hashval_t hash;
3630 }
3632 /* Compare two TYPENAME_TYPEs. */
3634 static bool
3636 {
3642 }
3643 };
3645 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3646 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3648 Returns the new TYPENAME_TYPE. */
3652 tree
3655 {
3656 tree t;
3657 tree d;
3658 typename_info ti;
3660 hashval_t hash;
3675 /* See if we already have this type. */
3679 else
3680 {
3681 /* Build the TYPENAME_TYPE. */
3688 /* Build the corresponding TYPE_DECL. */
3695 /* Store it in the hash table. */
3698 /* TYPENAME_TYPEs must always be compared structurally, because
3699 they may or may not resolve down to another type depending on
3700 the currently open classes. */
3702 }
3705 }
3707 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3708 provided to name the type. Returns an appropriate type, unless an
3709 error occurs, in which case error_mark_node is returned. If we
3710 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3711 return that, rather than the _TYPE it corresponds to, in other
3712 cases we look through the type decl. If TF_ERROR is set, complain
3713 about errors, otherwise be quiet. */
3715 tree
3717 tsubst_flags_t complain)
3718 {
3719 tree fullname;
3720 tree t;
3729 {
3734 else
3735 /* Create a TEMPLATE_ID_EXPR for the type. */
3739 }
3746 {
3751 {
3755 }
3756 }
3758 {
3762 }
3767 {
3771 }
3773 /* When the CONTEXT is a dependent type, NAME could refer to a
3774 dependent base class of CONTEXT. But look inside it anyway
3775 if CONTEXT is a currently open scope, in case it refers to a
3776 member of the current instantiation or a non-dependent base;
3777 lookup will stop when we hit a dependent base. */
3779 /* We should only set WANT_TYPE when we're a nested typename type.
3780 Then we can give better diagnostics if we find a non-type. */
3782 else
3791 {
3793 {
3796 else
3799 }
3801 }
3803 /* Pull out the template from an injected-class-name (or multiple). */
3808 {
3810 {
3813 }
3815 }
3818 {
3823 }
3825 {
3830 }
3835 /* If we are currently parsing a template and if T is a typedef accessed
3836 through CONTEXT then we need to remember and check access of T at
3837 template instantiation time. */
3852 }
3854 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3855 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3856 in which case error_mark_node is returned.
3858 If PARM_LIST is non-NULL, also make sure that the template parameter
3859 list of TEMPLATE_DECL matches.
3861 If COMPLAIN zero, don't complain about any errors that occur. */
3863 tree
3865 tsubst_flags_t complain)
3866 {
3867 tree t;
3868 tree d;
3878 {
3888 {
3892 }
3896 {
3898 {
3902 }
3904 }
3907 complain))
3911 }
3913 /* Build the UNBOUND_CLASS_TEMPLATE. */
3919 /* Build the corresponding TEMPLATE_DECL. */
3928 }
3930 \f
3932 /* Push the declarations of builtin types into the global namespace.
3933 RID_INDEX is the index of the builtin type in the array
3934 RID_POINTERS. NAME is the name used when looking up the builtin
3935 type. TYPE is the _TYPE node for the builtin type.
3937 The calls to set_global_binding below should be
3938 eliminated. Built-in types should not be looked up name; their
3939 names are keywords that the parser can recognize. However, there
3940 is code in c-common.c that uses identifier_global_value to look up
3941 built-in types by name. */
3943 void
3946 tree type)
3947 {
3951 {
3957 }
3962 {
3968 }
3971 {
3975 }
3976 }
3978 /* Push a type into the namespace so that the back ends ignore it. */
3980 static void
3982 {
3985 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3992 }
3994 /* Create all the predefined identifiers. */
3996 static void
3998 {
3999 struct predefined_identifier
4000 {
4004 };
4006 /* A table of identifiers to create at startup. */
4010 /* Some of these names have a trailing space so that it is
4011 impossible for them to conflict with names written by users. */
4028 /* The demangler expects anonymous namespaces to be called
4029 something starting with '_GLOBAL__N_'. It no longer needs
4030 to be unique to the TU. */
4036 };
4040 {
4042 /* Some of these identifiers already have a special kind. */
4045 }
4046 }
4048 /* Create the predefined scalar types of C,
4049 and some nodes representing standard constants (0, 1, (void *)0).
4050 Initialize the global binding level.
4051 Make definitions for built-in primitive functions. */
4053 void
4055 {
4056 tree void_ftype;
4057 tree void_ftype_ptr;
4059 /* Create all the identifiers we need. */
4062 /* Create the global variables. */
4067 /* Enter the global namespace. */
4070 void_type_node);
4074 /* Remember whether we want the empty class passing ABI change warning
4075 in this TU. */
4078 debug_hooks->register_main_translation_unit
4086 /* Initially, C. */
4089 /* Create the `std' namespace. */
4100 /* Guess at the initial static decls size. */
4103 /* ... and keyed classes. */
4115 NULL_TREE);
4117 #if 0
4119 #endif
4128 void_ftype_ptr
4131 /* Create the conversion operator marker. This operator's DECL_NAME
4132 is in the identifier table, so we can use identifier equality to
4133 find it. */
4135 void_ftype);
4137 /* C++ extensions */
4142 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
4145 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
4146 result. */
4153 {
4154 /* Make sure we get a unique function type, so we can give
4155 its pointer type a name. (This wins for gdb.) */
4162 }
4165 vtbl_type_node
4184 /* Now, C++. */
4189 {
4192 }
4198 {
4201 tree ptr_ftype_sizetype;
4202 tree new_eh_spec;
4204 ptr_ftype_sizetype
4207 {
4208 tree bad_alloc_id;
4209 tree bad_alloc_type_node;
4210 tree bad_alloc_decl;
4216 bad_alloc_decl
4221 new_eh_spec
4223 }
4224 else
4227 /* Ensure attribs.c is initialized. */
4230 /* Ensure constraint.cc is initialized. */
4234 NULL_TREE);
4237 extvisattr);
4251 {
4252 /* Also push the sized deallocation variants:
4253 void operator delete(void*, std::size_t) throw();
4254 void operator delete[](void*, std::size_t) throw(); */
4255 tree void_ftype_ptr_size
4259 extvisattr);
4263 }
4266 {
4273 /* operator new (size_t, align_val_t); */
4285 /* operator delete (void *, align_val_t); */
4294 {
4295 /* operator delete (void *, size_t, align_val_t); */
4298 NULL_TREE);
4303 }
4304 }
4316 }
4318 abort_fndecl
4322 /* Perform other language dependent initializations. */
4336 /* Show we use EH for cleanups. */
4339 }
4341 /* Generate an initializer for a function naming variable from
4342 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
4343 filled in with the type of the init. */
4345 tree
4347 {
4349 tree type;
4354 {
4358 }
4367 else
4371 }
4373 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
4374 the decl, LOC is the location to give the decl, NAME is the
4375 initialization string and TYPE_DEP indicates whether NAME depended
4376 on the type of the function. We make use of that to detect
4377 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
4378 at the point of first use, so we mustn't push the decl now. */
4380 static tree
4382 {
4385 tree type;
4399 {
4403 LOOKUP_ONLYCONVERTING);
4404 }
4405 else
4406 {
4409 }
4412 }
4414 static tree
4416 {
4424 /* Runtime library routines are, by definition, available in an
4425 external shared object. */
4431 /* A function in the user's namespace should have an explicit
4432 declaration before it is used. Mark the built-in function as
4433 anticipated but not actually declared. */
4437 {
4440 /* Treat __*_chk fortification functions as anticipated as well,
4441 unless they are __builtin_*. */
4446 }
4450 else
4454 }
4456 tree
4458 {
4461 /* All builtins that don't begin with an '_' should additionally
4462 go in the 'std' namespace. */
4464 {
4469 }
4472 }
4474 /* Like cxx_builtin_function, but guarantee the function is added to the global
4475 scope. This is to allow function specific options to add new machine
4476 dependent builtins when the target ISA changes via attribute((target(...)))
4477 which saves space on program startup if the program does not use non-generic
4478 ISAs. */
4480 tree
4482 {
4486 /* All builtins that don't begin with an '_' should additionally
4487 go in the 'std' namespace. */
4489 {
4494 }
4497 }
4499 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
4500 function. Not called directly. */
4502 static tree
4505 {
4513 /* Runtime library routines are, by definition, available in an
4514 external shared object. */
4519 }
4521 /* Returns the _DECL for a library function with C++ linkage. */
4523 static tree
4526 {
4531 }
4533 /* Like build_library_fn, but takes a C string instead of an
4534 IDENTIFIER_NODE. */
4536 tree
4538 {
4540 }
4542 /* Like build_cp_library_fn, but takes a C string instead of an
4543 IDENTIFIER_NODE. */
4545 tree
4547 {
4549 ecf_flags);
4550 }
4552 /* Like build_library_fn, but also pushes the function so that we will
4553 be able to find it via get_global_binding. Also, the function
4554 may throw exceptions listed in RAISES. */
4556 tree
4558 {
4559 tree fn;
4567 }
4569 /* Like build_cp_library_fn, but also pushes the function so that it
4570 will be found by normal lookup. */
4572 static tree
4575 {
4582 }
4584 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
4585 a FUNCTION_TYPE. */
4587 tree
4589 {
4592 }
4594 /* Like push_library_fn, but also note that this function throws
4595 and does not return. Used for __throw_foo and the like. */
4597 tree
4599 {
4602 }
4603 \f
4604 /* When we call finish_struct for an anonymous union, we create
4605 default copy constructors and such. But, an anonymous union
4606 shouldn't have such things; this function undoes the damage to the
4607 anonymous union type T.
4609 (The reason that we create the synthesized methods is that we don't
4610 distinguish `union { int i; }' from `typedef union { int i; } U'.
4611 The first is an anonymous union; the second is just an ordinary
4612 union type.) */
4614 void
4616 {
4617 /* Wipe out memory of synthesized methods. */
4625 /* Splice the implicitly generated functions out of TYPE_FIELDS. */
4629 else
4632 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4633 assignment operators (because they cannot have these methods themselves).
4634 For anonymous unions this is already checked because they are not allowed
4635 in any union, otherwise we have to check it. */
4637 {
4642 {
4645 {
4655 }
4656 }
4657 }
4658 }
4660 /* Warn for an attribute located at LOCATION that appertains to the
4661 class type CLASS_TYPE that has not been properly placed after its
4662 class-key, in it class-specifier. */
4664 void
4666 tree class_type)
4667 {
4671 "attribute ignored in declaration "
4676 }
4678 /* Make sure that a declaration with no declarator is well-formed, i.e.
4679 just declares a tagged type or anonymous union.
4681 Returns the type declared; or NULL_TREE if none. */
4683 tree
4686 {
4689 /* If a class, struct, or enum type is declared by the DECLSPECS
4690 (i.e, if a class-specifier, enum-specifier, or non-typename
4691 elaborated-type-specifier appears in the DECLSPECS),
4692 DECLARED_TYPE is set to the corresponding type. */
4699 {
4705 }
4718 {
4720 "%<auto%> can only be specified for variables "
4723 }
4724 /* Check for an anonymous union. */
4727 {
4728 /* 7/3 In a simple-declaration, the optional init-declarator-list
4729 can be omitted only when declaring a class (clause 9) or
4730 enumeration (7.2), that is, when the decl-specifier-seq contains
4731 either a class-specifier, an elaborated-type-specifier with
4732 a class-key (9.1), or an enum-specifier. In these cases and
4733 whenever a class-specifier or enum-specifier is present in the
4734 decl-specifier-seq, the identifiers in these specifiers are among
4735 the names being declared by the declaration (as class-name,
4736 enum-names, or enumerators, depending on the syntax). In such
4737 cases, and except for the declaration of an unnamed bit-field (9.6),
4738 the decl-specifier-seq shall introduce one or more names into the
4739 program, or shall redeclare a name introduced by a previous
4740 declaration. [Example:
4741 enum { }; // ill-formed
4742 typedef class { }; // ill-formed
4743 --end example] */
4745 {
4748 }
4755 }
4757 else
4758 {
4766 && (!current_class_type
4775 "a storage class can only be specified for objects "
4779 "%<const%> can only be specified for objects and "
4783 "%<volatile%> can only be specified for objects and "
4787 "%<__restrict%> can only be specified for objects and "
4791 "%<__thread%> can only be specified for objects "
4799 }
4802 {
4803 location_t loc;
4806 /* For a non-template class, use the name location. */
4808 else
4809 /* For a template class (an explicit instantiation), use the
4810 current location. */
4814 /* [dcl.attr.grammar]/4:
4816 No attribute-specifier-seq shall appertain to an explicit
4817 instantiation. */
4818 {
4821 declared_type))
4823 "no attribute can be applied to "
4825 }
4826 else
4828 }
4831 }
4833 /* Called when a declaration is seen that contains no names to declare.
4834 If its type is a reference to a structure, union or enum inherited
4835 from a containing scope, shadow that tag name for the current scope
4836 with a forward reference.
4837 If its type defines a new named structure or union
4838 or defines an enum, it is valid but we need not do anything here.
4839 Otherwise, it is an error.
4841 C++: may have to grok the declspecs to learn about static,
4842 complain for anonymous unions.
4844 Returns the TYPE declared -- or NULL_TREE if none. */
4846 tree
4848 {
4858 /* This is where the variables in an anonymous union are
4859 declared. An anonymous union declaration looks like:
4860 union { ... } ;
4861 because there is no declarator after the union, the parser
4862 sends that declaration here. */
4864 {
4868 {
4872 }
4873 }
4876 }
4877 \f
4878 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4880 tree
4884 {
4885 tree attrs;
4886 tree type;
4887 enum decl_context context
4893 {
4898 /* A template type parameter or other dependent type. */
4901 else
4903 }
4905 }
4907 /* Process a DECLARATOR for a function-scope variable declaration,
4908 namespace-scope variable declaration, or function declaration.
4909 (Function definitions go through start_function; class member
4910 declarations appearing in the body of the class go through
4911 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4912 If an error occurs, the error_mark_node is returned instead.
4914 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4915 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4916 for an explicitly defaulted function, or SD_DELETED for an explicitly
4917 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4918 implicitly initialized via a default constructor. ATTRIBUTES and
4919 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4921 The scope represented by the context of the returned DECL is pushed
4922 (if it is not the global namespace) and is assigned to
4923 *PUSHED_SCOPE_P. The caller is then responsible for calling
4924 pop_scope on *PUSHED_SCOPE_P if it is set. */
4926 tree
4930 tree attributes,
4931 tree prefix_attributes,
4933 {
4934 tree decl;
4935 tree context;
4942 /* An object declared as __attribute__((deprecated)) suppresses
4943 warnings of uses of other deprecated items. */
4962 /* Is it valid for this decl to have an initializer at all?
4963 If not, set INITIALIZED to zero, which will indirectly
4964 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4967 {
4970 }
4973 {
4977 decl);
4981 }
4987 /* If this is a typedef that names the class for linkage purposes
4988 (7.1.3p8), apply any attributes directly to the type. */
4993 else
4996 /* Set attributes here so if duplicate decl, will have proper attributes. */
4999 /* Dllimported symbols cannot be defined. Static data members (which
5000 can be initialized in-class and dllimported) go through grokfield,
5001 not here, so we don't need to exclude those decls when checking for
5002 a definition. */
5004 {
5007 }
5009 /* If #pragma weak was used, mark the decl weak now. */
5021 {
5025 {
5031 {
5035 else
5036 {
5042 }
5043 }
5044 else
5045 {
5050 {
5057 }
5058 /* Static data member are tricky; an in-class initialization
5059 still doesn't provide a definition, so the in-class
5060 declaration will have DECL_EXTERNAL set, but will have an
5061 initialization. Thus, duplicate_decls won't warn
5062 about this situation, and so we check here. */
5071 }
5072 }
5073 else
5074 {
5076 this_tmpl
5077 ? current_template_parms
5083 }
5085 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
5087 /* Do not mark DECL as an explicit specialization if it was not
5088 already marked as an instantiation; a declaration should
5089 never be marked as a specialization unless we know what
5090 template is being specialized. */
5092 {
5097 else
5100 /* [temp.expl.spec] An explicit specialization of a static data
5101 member of a template is a definition if the declaration
5102 includes an initializer; otherwise, it is a declaration.
5104 We check for processing_specialization so this only applies
5105 to the new specialization syntax. */
5108 }
5111 /* Aliases are definitions. */
5114 decl);
5115 }
5119 /* Enter this declaration into the symbol table. Don't push the plain
5120 VAR_DECL for a variable template. */
5133 {
5134 /* This is a const variable with implicit 'static'. Set
5135 DECL_THIS_STATIC so we can tell it from variables that are
5136 !TREE_PUBLIC because of the anonymous namespace. */
5139 }
5143 {
5147 decl);
5150 else
5154 }
5160 }
5162 /* Process the declaration of a variable DECL. INITIALIZED is true
5163 iff DECL is explicitly initialized. (INITIALIZED is false if the
5164 variable is initialized via an implicitly-called constructor.)
5165 This function must be called for ordinary variables (including, for
5166 example, implicit instantiations of templates), but must not be
5167 called for template declarations. */
5169 void
5171 {
5172 tree type;
5187 /* If an explicit initializer is present, or if this is a definition
5188 of an aggregate, then we need a complete type at this point.
5189 (Scalars are always complete types, so there is nothing to
5190 check.) This code just sets COMPLETE_P; errors (if necessary)
5191 are issued below. */
5193 && !complete_p
5195 {
5197 /* We will not yet have set TREE_READONLY on DECL if the type
5198 was "const", but incomplete, before this point. But, now, we
5199 have a complete type, so we can try again. */
5201 }
5204 /* Is it valid for this decl to have an initializer at all? */
5205 {
5206 /* Don't allow initializations for incomplete types except for
5207 arrays which might be completed by the initialization. */
5213 {
5216 }
5218 {
5221 /* else we already gave an error in start_decl. */
5222 }
5223 }
5225 {
5228 else
5229 {
5231 decl);
5232 /* Change the type so that assemble_variable will give
5233 DECL an rtl we can live with: (mem (const_int 0)). */
5235 }
5236 }
5238 /* Create a new scope to hold this declaration if necessary.
5239 Whether or not a new scope is necessary cannot be determined
5240 until after the type has been completed; if the type is a
5241 specialization of a class template it is not until after
5242 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
5243 will be set correctly. */
5245 }
5247 /* Handle initialization of references. DECL, TYPE, and INIT have the
5248 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
5249 but will be set to a new CLEANUP_STMT if a temporary is created
5250 that must be destroyed subsequently.
5252 Returns an initializer expression to use to initialize DECL, or
5253 NULL if the initialization can be performed statically.
5255 Quotes on semantics can be found in ARM 8.4.3. */
5257 static tree
5259 {
5261 {
5267 }
5271 tf_warning_or_error);
5276 /* Note: default conversion is only called in very special cases. */
5279 /* check_initializer handles this for non-reference variables, but for
5280 references we need to do it here or the initializer will get the
5281 incomplete array type and confuse later calls to
5282 cp_complete_array_type. */
5287 {
5291 }
5293 /* Convert INIT to the reference type TYPE. This may involve the
5294 creation of a temporary, whose lifetime must be the same as that
5295 of the reference. If so, a DECL_EXPR for the temporary will be
5296 added just after the DECL_EXPR for DECL. That's why we don't set
5297 DECL_INITIAL for local references (instead assigning to them
5298 explicitly); we need to allow the temporary to be initialized
5299 first. */
5301 tf_warning_or_error);
5302 }
5304 /* Designated initializers in arrays are not supported in GNU C++.
5305 The parser cannot detect this error since it does not know whether
5306 a given brace-enclosed initializer is for a class type or for an
5307 array. This function checks that CE does not use a designated
5308 initializer. If it does, an error is issued. Returns true if CE
5309 is valid, i.e., does not have a designated initializer. */
5311 bool
5314 {
5315 /* Designated initializers for array elements are not supported. */
5317 {
5318 /* The parser only allows identifiers as designated
5319 initializers. */
5321 {
5325 }
5327 {
5331 }
5339 {
5340 /* A C99 designator is OK if it matches the current index. */
5343 else
5345 }
5346 else
5351 }
5354 }
5356 /* When parsing `int a[] = {1, 2};' we don't know the size of the
5357 array until we finish parsing the initializer. If that's the
5358 situation we're in, update DECL accordingly. */
5360 static void
5362 {
5368 {
5369 /* do_default is really a C-ism to deal with tentative definitions.
5370 But let's leave it here to ease the eventual merge. */
5375 /* Check that there are no designated initializers in INIT, as
5376 those are not supported in GNU C++, and as the middle-end
5377 will crash if presented with a non-numeric designated
5378 initializer. */
5380 {
5383 HOST_WIDE_INT i;
5387 }
5390 {
5392 do_default);
5394 {
5398 }
5400 {
5402 {
5405 }
5406 /* If a `static' var's size isn't known, make it extern as
5407 well as static, so it does not get allocated. If it's not
5408 `static', then don't mark it extern; finish_incomplete_decl
5409 will give it a default size and it will get allocated. */
5412 }
5414 {
5417 }
5418 }
5423 }
5424 }
5426 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
5427 any appropriate error messages regarding the layout. */
5429 static void
5431 {
5432 tree type;
5438 /* If we haven't already laid out this declaration, do so now.
5439 Note that we must not call complete type for an external object
5440 because it's type might involve templates that we are not
5441 supposed to instantiate yet. (And it's perfectly valid to say
5442 `extern X x' for some incomplete type `X'.) */
5451 {
5452 /* An automatic variable with an incomplete type: that is an error.
5453 Don't talk about array types here, since we took care of that
5454 message in grokdeclarator. */
5458 }
5459 #if 0
5460 /* Keep this code around in case we later want to control debug info
5461 based on whether a type is "used". (jason 1999-11-11) */
5464 /* Let debugger know it should output info for this type. */
5469 #endif
5474 {
5477 else
5478 {
5482 }
5483 }
5484 }
5486 /* If a local static variable is declared in an inline function, or if
5487 we have a weak definition, we must endeavor to create only one
5488 instance of the variable at link-time. */
5490 void
5492 {
5493 /* Static data in a function with comdat linkage also has comdat
5494 linkage. */
5496 /* Don't mess with __FUNCTION__. */
5501 {
5503 {
5504 /* With weak symbols, we simply make the variable COMDAT;
5505 that will cause copies in multiple translations units to
5506 be merged. */
5508 }
5509 else
5510 {
5513 {
5514 /* Without weak symbols, we can use COMMON to merge
5515 uninitialized variables. */
5518 }
5519 else
5520 {
5521 /* While for initialized variables, we must use internal
5522 linkage -- which means that multiple copies will not
5523 be merged. */
5529 "%q#D are wrong (you%'ll wind up with "
5531 else
5533 "static data %q#D are wrong (you%'ll wind "
5539 }
5540 }
5541 }
5542 }
5544 /* Issue an error message if DECL is an uninitialized const variable. */
5546 static void
5548 {
5551 /* ``Unless explicitly declared extern, a const object does not have
5552 external linkage and must be initialized. ($8.4; $12.1)'' ARM
5553 7.1.6 */
5558 {
5566 else
5567 {
5571 decl);
5573 }
5576 {
5577 tree defaulted_ctor;
5584 "constructor is not user-provided because it is "
5587 "and the implicitly-defined constructor does not "
5589 }
5590 }
5591 }
5592 \f
5593 /* Structure holding the current initializer being processed by reshape_init.
5594 CUR is a pointer to the current element being processed, END is a pointer
5595 after the last element present in the initializer. */
5596 struct reshape_iter
5597 {
5600 };
5604 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
5605 returned is the next FIELD_DECL (possibly FIELD itself) that can be
5606 initialized. If there are no more such fields, the return value
5607 will be NULL. */
5609 tree
5611 {
5620 }
5622 /* Return true for [dcl.init.list] direct-list-initialization from
5623 single element of enumeration with a fixed underlying type. */
5625 bool
5627 {
5636 }
5638 /* Subroutine of reshape_init_array and reshape_init_vector, which does
5639 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
5640 INTEGER_CST representing the size of the array minus one (the maximum index),
5641 or NULL_TREE if the array was declared without specifying the size. D is
5642 the iterator within the constructor. */
5644 static tree
5646 tsubst_flags_t complain)
5647 {
5648 tree new_init;
5653 /* The initializer for an array is always a CONSTRUCTOR. */
5657 {
5658 /* Minus 1 is used for zero sized arrays. */
5664 /* sizetype is sign extended, not zero extended. */
5665 else
5667 }
5669 /* Loop until there are no more initializers. */
5673 {
5674 tree elt_init;
5679 complain);
5687 /* This can happen with an invalid initializer (c++/54501). */
5690 }
5693 }
5695 /* Subroutine of reshape_init_r, processes the initializers for arrays.
5696 Parameters are the same of reshape_init_r. */
5698 static tree
5700 {
5709 }
5711 /* Subroutine of reshape_init_r, processes the initializers for vectors.
5712 Parameters are the same of reshape_init_r. */
5714 static tree
5716 {
5722 {
5725 {
5730 }
5733 }
5735 /* For a vector, we initialize it as an array of the appropriate size. */
5740 }
5742 /* Subroutine of reshape_init_r, processes the initializers for classes
5743 or union. Parameters are the same of reshape_init_r. */
5745 static tree
5747 tsubst_flags_t complain)
5748 {
5749 tree field;
5750 tree new_init;
5754 /* The initializer for a class is always a CONSTRUCTOR. */
5759 {
5760 /* [dcl.init.aggr]
5762 An initializer for an aggregate member that is an
5763 empty class shall have the form of an empty
5764 initializer-list {}. */
5766 {
5770 }
5772 }
5774 /* Loop through the initializable fields, gathering initializers. */
5776 {
5777 tree field_init;
5780 /* Handle designated initializers, as an extension. */
5782 {
5787 /* We already reshaped this. */
5791 else
5792 {
5797 }
5800 {
5805 }
5806 }
5808 /* If we processed all the member of the class, we are done. */
5818 {
5819 /* This can happen with an invalid initializer for a flexible
5820 array member (c++/54441). */
5824 }
5828 /* [dcl.init.aggr]
5830 When a union is initialized with a brace-enclosed
5831 initializer, the braces shall only contain an
5832 initializer for the first member of the union. */
5837 }
5840 }
5842 /* Subroutine of reshape_init_r. We're in a context where C99 initializer
5843 designators are not valid; either complain or return true to indicate
5844 that reshape_init_r should return error_mark_node. */
5846 static bool
5848 {
5850 {
5854 else
5856 }
5858 }
5860 /* Subroutine of reshape_init, which processes a single initializer (part of
5861 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5862 iterator within the CONSTRUCTOR which points to the initializer to process.
5863 FIRST_INITIALIZER_P is true if this is the first initializer of the
5864 outermost CONSTRUCTOR node. */
5866 static tree
5868 tsubst_flags_t complain)
5869 {
5880 {
5881 /* A complex type can be initialized from one or two initializers,
5882 but braces are not elided. */
5885 {
5887 {
5890 else
5892 }
5893 }
5895 {
5903 }
5905 }
5907 /* A non-aggregate type is always initialized with a single
5908 initializer. */
5910 {
5911 /* It is invalid to initialize a non-aggregate type with a
5912 brace-enclosed initializer before C++0x.
5913 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
5914 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
5915 a CONSTRUCTOR (with a record type). */
5917 /* Don't complain about a capture-init. */
5920 {
5922 {
5924 /* Isn't value-initialization. */
5926 {
5929 type);
5931 }
5932 }
5933 else
5935 }
5939 }
5941 /* "If T is a class type and the initializer list has a single element of
5942 type cv U, where U is T or a class derived from T, the object is
5943 initialized from that element." Even if T is an aggregate. */
5945 && first_initializer_p
5948 {
5951 }
5953 /* [dcl.init.aggr]
5955 All implicit type conversions (clause _conv_) are considered when
5956 initializing the aggregate member with an initializer from an
5957 initializer-list. If the initializer can initialize a member,
5958 the member is initialized. Otherwise, if the member is itself a
5959 non-empty subaggregate, brace elision is assumed and the
5960 initializer is considered for the initialization of the first
5961 member of the subaggregate. */
5963 /* But don't try this for the first initializer, since that would be
5964 looking through the outermost braces; A a2 = { a1 }; is not a
5965 valid aggregate initialization. */
5966 && !first_initializer_p
5969 complain)))
5970 {
5973 }
5975 /* [dcl.init.string]
5977 A char array (whether plain char, signed char, or unsigned char)
5978 can be initialized by a string-literal (optionally enclosed in
5979 braces); a wchar_t array can be initialized by a wide
5980 string-literal (optionally enclosed in braces). */
5983 {
5986 /* Strip one level of braces if and only if they enclose a single
5987 element (as allowed by [dcl.init.string]). */
5991 {
5993 }
5995 /* If it's a string literal, then it's the initializer for the array
5996 as a whole. Otherwise, continue with normal initialization for
5997 array types (one value per array element). */
5999 {
6004 }
6005 }
6007 /* The following cases are about aggregates. If we are not within a full
6008 initializer already, and there is not a CONSTRUCTOR, it means that there
6009 is a missing set of braces (that is, we are processing the case for
6010 which reshape_init exists). */
6012 {
6014 {
6016 /* There is no need to reshape pointer-to-member function
6017 initializers, as they are always constructed correctly
6018 by the front end. */
6019 ;
6021 /* For a nested compound literal, there is no need to reshape since
6022 brace elision is not allowed. Even if we decided to allow it,
6023 we should add a call to reshape_init in finish_compound_literal,
6024 before calling digest_init, so changing this code would still
6025 not be necessary. */
6027 else
6028 {
6032 }
6033 }
6038 type);
6039 }
6041 /* Dispatch to specialized routines. */
6048 else
6050 }
6052 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
6053 brace-enclosed aggregate initializer.
6055 INIT is the CONSTRUCTOR containing the list of initializers describing
6056 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
6057 It may not presently match the shape of the TYPE; for example:
6059 struct S { int a; int b; };
6060 struct S a[] = { 1, 2, 3, 4 };
6062 Here INIT will hold a vector of four elements, rather than a
6063 vector of two elements, each itself a vector of two elements. This
6064 routine transforms INIT from the former form into the latter. The
6065 revised CONSTRUCTOR node is returned. */
6067 tree
6069 {
6071 reshape_iter d;
6072 tree new_init;
6078 /* An empty constructor does not need reshaping, and it is always a valid
6079 initializer. */
6083 /* Handle [dcl.init.list] direct-list-initialization from
6084 single element of enumeration with a fixed underlying type. */
6086 {
6090 {
6093 }
6094 else
6096 }
6098 /* Recurse on this CONSTRUCTOR. */
6106 /* Make sure all the element of the constructor were used. Otherwise,
6107 issue an error about exceeding initializers. */
6109 {
6113 }
6120 }
6122 /* Verify array initializer. Returns true if errors have been reported. */
6124 bool
6126 {
6129 /* The array type itself need not be complete, because the
6130 initializer may tell us how many elements are in the array.
6131 But, the elements of the array must be complete. */
6133 {
6137 else
6140 }
6141 /* A compound literal can't have variable size. */
6145 {
6148 }
6150 }
6152 /* Subroutine of check_initializer; args are passed down from that function.
6153 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
6155 static tree
6158 {
6161 }
6163 /* Verify INIT (the initializer for DECL), and record the
6164 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
6165 grok_reference_init.
6167 If the return value is non-NULL, it is an expression that must be
6168 evaluated dynamically to initialize DECL. */
6170 static tree
6172 {
6175 tree core_type;
6177 /* Things that are going to be initialized need to have complete
6178 type. */
6182 {
6183 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
6184 it doesn't have storage to be initialized. */
6187 }
6190 /* We will have already complained. */
6194 {
6197 }
6199 {
6204 }
6205 else
6206 /* There is no way to make a variable-sized class type in GNU C++. */
6210 {
6213 {
6215 {
6218 }
6220 {
6222 "scalar object %qD requires one element in "
6226 }
6227 }
6228 }
6231 {
6238 }
6240 ;
6243 {
6245 {
6248 }
6251 /* Do not reshape constructors of vectors (they don't need to be
6252 reshaped. */
6254 {
6256 {
6258 tf_warning_or_error);
6260 }
6262 {
6263 /* Don't reshape if the class has constructors. */
6266 "in C++98 %qD must be initialized by "
6268 decl);
6269 }
6271 {
6274 }
6275 else
6276 {
6279 }
6280 }
6284 {
6287 /* We get here with code like `int a (2);' */
6289 tf_warning_or_error);
6290 }
6292 /* If DECL has an array type without a specific bound, deduce the
6293 array size from the initializer. */
6307 {
6310 /* A constructor call is a non-trivial initializer even if
6311 it isn't explicitly written. */
6315 /* If this is a constexpr initializer, expand_default_init will
6316 have returned an INIT_EXPR rather than a CALL_EXPR. In that
6317 case, pull the initializer back out and pass it down into
6318 store_init_value. */
6323 {
6326 /* Don't call digest_init; it's unnecessary and will complain
6327 about aggregate initialization of non-aggregate classes. */
6329 }
6331 {
6332 /* Declared constexpr, but no suitable initializer; massage
6333 init appropriately so we can pass it into store_init_value
6334 for the error. */
6337 {
6341 }
6343 }
6344 else
6346 }
6349 {
6350 /* In aggregate initialization of a variable, each element
6351 initialization is a full-expression because there is no
6352 enclosing expression. */
6367 }
6368 }
6369 else
6370 {
6378 }
6384 {
6385 /* We might have set these in cp_finish_decl. */
6388 }
6392 {
6400 else
6404 {
6408 }
6410 }
6413 }
6415 /* If DECL is not a local variable, give it RTL. */
6417 static void
6419 {
6423 /* Set the DECL_ASSEMBLER_NAME for the object. */
6425 {
6426 /* The `register' keyword, when used together with an
6427 asm-specification, indicates that the variable should be
6428 placed in a particular register. */
6430 {
6433 }
6434 else
6435 {
6440 }
6441 }
6443 /* Handle non-variables up front. */
6445 {
6448 }
6450 /* If we see a class member here, it should be a static data
6451 member. */
6453 {
6455 /* An in-class declaration of a static data member should be
6456 external; it is only a declaration, and not a definition. */
6461 }
6463 /* We don't create any RTL for local variables. */
6467 /* We defer emission of local statics until the corresponding
6468 DECL_EXPR is expanded. But with constexpr its function might never
6469 be expanded, so go ahead and tell cgraph about the variable now. */
6474 /* Defer template instantiations. */
6479 /* If we're not deferring, go ahead and assemble the variable. */
6482 }
6484 /* walk_tree helper for wrap_temporary_cleanups, below. */
6486 static tree
6488 {
6489 /* Stop at types or full-expression boundaries. */
6492 {
6495 }
6498 {
6503 /* Tell honor_protect_cleanup_actions to handle this as a separate
6504 cleanup. */
6508 }
6511 }
6513 /* We're initializing a local variable which has a cleanup GUARD. If there
6514 are any temporaries used in the initializer INIT of this variable, we
6515 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
6516 variable will be cleaned up properly if one of them throws.
6518 Unfortunately, there's no way to express this properly in terms of
6519 nesting, as the regions for the temporaries overlap the region for the
6520 variable itself; if there are two temporaries, the variable needs to be
6521 the first thing destroyed if either of them throws. However, we only
6522 want to run the variable's cleanup if it actually got constructed. So
6523 we need to guard the temporary cleanups with the variable's cleanup if
6524 they are run on the normal path, but not if they are run on the
6525 exceptional path. We implement this by telling
6526 honor_protect_cleanup_actions to strip the variable cleanup from the
6527 exceptional path. */
6529 static void
6531 {
6533 }
6535 /* Generate code to initialize DECL (a local variable). */
6537 static void
6539 {
6541 tree cleanup;
6549 {
6550 /* If we used it already as memory, it must stay in memory. */
6554 }
6559 /* Compute and store the initial value. */
6564 /* Generate a cleanup, if necessary. */
6567 /* Perform the initialization. */
6569 {
6573 {
6574 /* Stick simple initializers in DECL_INITIAL so that
6575 -Wno-init-self works (c++/34772). */
6580 {
6584 OPT_Winit_self,
6586 }
6587 }
6588 else
6589 {
6592 /* If we're only initializing a single object, guard the
6593 destructors of any temporaries used in its initializer with
6594 its destructor. This isn't right for arrays because each
6595 element initialization is a full-expression. */
6604 saved_stmts_are_full_exprs_p;
6605 }
6606 }
6608 /* Set this to 0 so we can tell whether an aggregate which was
6609 initialized was ever used. Don't do this if it has a
6610 destructor, so we don't complain about the 'resource
6611 allocation is initialization' idiom. Now set
6612 attribute((unused)) on types so decls of that type will be
6613 marked used. (see TREE_USED, above.) */
6615 && ! already_used
6624 }
6626 /* DECL is a VAR_DECL for a compiler-generated variable with static
6627 storage duration (like a virtual table) whose initializer is a
6628 compile-time constant. Initialize the variable and provide it to the
6629 back end. */
6631 void
6633 {
6634 tree init;
6644 }
6646 /* INIT is the initializer for a variable, as represented by the
6647 parser. Returns true iff INIT is value-dependent. */
6649 static bool
6651 {
6653 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
6656 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
6657 {
6670 }
6671 else
6672 /* It must be a simple expression, e.g., int i = 3; */
6676 }
6678 // Returns true if a DECL is VAR_DECL with the concept specifier.
6681 {
6683 // Not all variables have DECL_LANG_SPECIFIC.
6686 }
6688 /* A helper function to be called via walk_tree. If any label exists
6689 under *TP, it is (going to be) forced. Set has_forced_label_in_static. */
6691 static tree
6693 {
6699 }
6701 /* Finish processing of a declaration;
6702 install its line number and initial value.
6703 If the length of an array type is not known before,
6704 it must be determined now, from the initial value, or it is an error.
6706 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
6707 true, then INIT is an integral constant expression.
6709 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
6710 if the (init) syntax was used. */
6712 void
6715 {
6716 tree type;
6721 tree auto_node;
6726 {
6730 }
6733 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
6740 /* Warn about register storage specifiers except when in GNU global
6741 or local register variable extension. */
6743 {
6746 "ISO C++17 does not allow %<register%> storage "
6748 else
6751 }
6753 /* If a name was specified, get the string. */
6768 {
6769 tree d_init;
6771 {
6775 {
6776 /* init is null because we're deferring instantiating the
6777 initializer until we need it. Well, we need it now. */
6780 }
6783 }
6786 {
6790 tf_warning_or_error);
6792 }
6802 {
6807 }
6809 }
6820 {
6821 tree clone;
6823 {
6824 /* FIXME check this is 1st decl. */
6829 {
6833 }
6835 }
6837 {
6840 else
6842 }
6843 }
6846 {
6848 /* If DECL is a reference, then we want to know whether init is a
6849 reference constant; init_const_expr_p as passed tells us whether
6850 it's an rvalue constant. */
6854 {
6855 /* Set these flags now for templates. We'll update the flags in
6856 store_init_value for instantiations. */
6859 /* FIXME setting TREE_CONSTANT on refs breaks the back end. */
6862 }
6863 }
6866 {
6869 /* Add this declaration to the statement-tree. */
6876 {
6879 }
6881 /* Generally, initializers in templates are expanded when the
6882 template is instantiated. But, if DECL is a variable constant
6883 then it can be used in future constant expressions, so its value
6884 must be available. */
6893 && init_const_expr_p
6897 {
6898 /* This variable seems to be a non-dependent constant, so process
6899 its initializer. If check_initializer returns non-null the
6900 initialization wasn't constant after all. */
6901 tree init_code;
6907 }
6909 {
6910 /* Deduce array size even if the initializer is dependent. */
6912 /* And complain about multiple initializers. */
6916 tf_warning_or_error);
6917 }
6922 {
6925 }
6927 }
6929 /* Just store non-static data member initializers for later. */
6933 /* Take care of TYPE_DECLs up front. */
6935 {
6938 {
6942 }
6944 /* If we have installed this as the canonical typedef for this
6945 type, and that type has not been defined yet, delay emitting
6946 the debug information for it, as we will emit it later. */
6952 at_eof);
6954 }
6956 /* A reference will be modified here, as it is initialized. */
6960 {
6963 }
6966 {
6967 /* If this is a local variable that will need a mangled name,
6968 register it now. We must do this before processing the
6969 initializer for the variable, since the initialization might
6970 require a guard variable, and since the mangled name of the
6971 guard variable will depend on the mangled name of this
6972 variable. */
6976 {
6978 /* Normally has_forced_label_in_static is set during GIMPLE
6979 lowering, but [cd]tors are never actually compiled directly.
6980 We need to set this early so we can deal with the label
6981 address extension. */
6985 {
6988 }
6989 /* And make sure it's in the symbol table for
6990 c_parse_final_cleanups to find. */
6992 }
6994 /* Convert the initializer to the type of DECL, if we have not
6995 already initialized DECL. */
6997 /* If !DECL_EXTERNAL then DECL is being defined. In the
6998 case of a static data member initialized inside the
6999 class-specifier, there can be an initializer even if DECL
7000 is *not* defined. */
7002 {
7006 /* Handle:
7008 [dcl.init]
7010 The memory occupied by any object of static storage
7011 duration is zero-initialized at program startup before
7012 any other initialization takes place.
7014 We cannot create an appropriate initializer until after
7015 the type of DECL is finalized. If DECL_INITIAL is set,
7016 then the DECL is statically initialized, and any
7017 necessary zero-initialization has already been performed. */
7022 /* Remember that the initialization for this variable has
7023 taken place. */
7025 /* This declaration is the definition of this variable,
7026 unless we are initializing a static data member within
7027 the class specifier. */
7030 }
7031 /* If the variable has an array type, lay out the type, even if
7032 there is no initializer. It is valid to index through the
7033 array, and we must get TYPE_ALIGN set correctly on the array
7034 type. */
7041 /* So decl is a global variable or a static member of a
7042 non local class. Record the types it uses
7043 so that we can decide later to emit debug info for them. */
7045 }
7047 /* Add this declaration to the statement-tree. This needs to happen
7048 after the call to check_initializer so that the DECL_EXPR for a
7049 reference temp is added before the DECL_EXPR for the reference itself. */
7051 {
7052 /* If we're building a variable sized type, and we might be
7053 reachable other than via the top of the current binding
7054 level, then create a new BIND_EXPR so that we deallocate
7055 the object at the right time. */
7060 {
7061 tree bind;
7066 }
7068 }
7070 /* Let the middle end know about variables and functions -- but not
7071 static data members in uninstantiated class templates. */
7073 {
7075 {
7078 }
7080 /* This needs to happen after the linkage is set. */
7084 {
7085 /* If a TREE_READONLY variable needs initialization
7086 at runtime, it is no longer readonly and we need to
7087 avoid MEM_READONLY_P being set on RTL created for it. */
7089 {
7093 }
7097 /* Likewise if it needs destruction. */
7100 }
7104 /* Check for abstractness of the type. Notice that there is no
7105 need to strip array types here since the check for those types
7106 is already done within create_array_type_for_decl. */
7110 /* No initialization required. */
7111 ;
7113 {
7115 {
7117 {
7118 /* An out-of-class default definition is defined at
7119 the point where it is explicitly defaulted. */
7124 }
7125 else
7127 }
7128 /* else no initialization required. */
7129 }
7133 {
7136 }
7137 /* A variable definition. */
7139 /* Initialize the local variable. */
7142 /* If a variable is defined, and then a subsequent
7143 definition with external linkage is encountered, we will
7144 get here twice for the same variable. We want to avoid
7145 calling expand_static_init more than once. For variables
7146 that are not static data members, we can call
7147 expand_static_init only when we actually process the
7148 initializer. It is not legal to redeclare a static data
7149 member, so this issue does not arise in that case. */
7152 }
7154 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
7155 reference, insert it in the statement-tree now. */
7157 {
7162 }
7168 }
7170 /* For class TYPE return itself or some its bases that contain
7171 any direct non-static data members. Return error_mark_node if an
7172 error has been diagnosed. */
7174 static tree
7176 {
7184 {
7188 else
7193 }
7195 {
7203 }
7204 else
7214 {
7219 {
7221 {
7226 }
7230 /* OK, found the same base along another path. We'll complain
7233 {
7235 "classes %qT and %qT have non-static data "
7238 }
7239 else
7241 }
7242 }
7244 }
7246 /* Return std::tuple_size<TYPE>::value. */
7248 static tree
7250 {
7266 else
7268 }
7270 /* Return std::tuple_element<I,TYPE>::type. */
7272 static tree
7274 {
7282 tf_warning_or_error);
7285 }
7287 /* Return e.get<i>() or get<i>(e). */
7289 static tree
7291 {
7299 /* [The id-expression] e is an lvalue if the type of the entity e is an
7300 lvalue reference and an xvalue otherwise. */
7308 {
7313 }
7314 else
7315 {
7321 }
7322 }
7324 /* It's impossible to recover the decltype of a tuple decomposition variable
7325 based on the actual type of the variable, so store it in a hash table. */
7328 static void
7330 {
7334 }
7336 tree
7338 {
7340 }
7342 /* Mangle a decomposition declaration if needed. Arguments like
7343 in cp_finish_decomp. */
7345 void
7347 {
7351 {
7358 }
7359 }
7361 /* Finish a decomposition declaration. DECL is the underlying declaration
7362 "e", FIRST is the head of a chain of decls for the individual identifiers
7363 chained through DECL_CHAIN in reverse order and COUNT is the number of
7364 those decls. */
7366 void
7368 {
7370 {
7371 error_out:
7373 {
7376 {
7379 }
7381 }
7385 }
7389 /* This happens for range for when not in templates.
7390 Still add the DECL_VALUE_EXPRs for later processing. */
7391 || (!processing_template_decl
7393 {
7395 {
7397 {
7403 }
7407 }
7409 }
7415 {
7418 }
7424 {
7429 }
7434 {
7435 tree nelts;
7440 {
7443 }
7446 {
7447 cnt_mismatch:
7452 else
7456 /* Some languages have special plural rules even for large values,
7457 but it is periodic with period of 10, 100, 1000 etc. */
7464 }
7467 {
7475 NULL_TREE);
7478 }
7479 }
7480 /* 2 GNU extensions. */
7482 {
7488 {
7496 t);
7499 }
7500 }
7502 {
7504 {
7507 }
7512 {
7522 NULL_TREE);
7525 }
7526 }
7528 {
7530 {
7534 }
7536 {
7543 }
7549 {
7560 {
7564 }
7565 /* Save the decltype away before reference collapse. */
7571 {
7572 /* In this case the names are variables, not just proxies. */
7575 }
7579 }
7580 /* Ignore reads from the underlying decl performed during initialization
7581 of the individual variables. If those will be read, we'll mark
7582 the underlying decl as read at that point. */
7584 }
7586 {
7589 }
7591 {
7594 }
7596 {
7599 }
7600 else
7601 {
7606 {
7610 }
7614 else
7615 eltscnt++;
7620 {
7624 }
7629 else
7630 {
7632 NULL_TREE);
7638 {
7641 }
7642 i++;
7643 }
7644 }
7646 {
7649 {
7654 }
7655 }
7656 }
7658 /* Returns a declaration for a VAR_DECL as if:
7660 extern "C" TYPE NAME;
7662 had been seen. Used to create compiler-generated global
7663 variables. */
7665 static tree
7667 {
7668 tree decl;
7676 /* If the user has explicitly declared this variable (perhaps
7677 because the code we are compiling is part of a low-level runtime
7678 library), then it is possible that our declaration will be merged
7679 with theirs by pushdecl. */
7685 }
7687 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
7688 if "__cxa_atexit" is not being used) corresponding to the function
7689 to be called when the program exits. */
7691 static tree
7693 {
7694 tree fn_type;
7697 {
7698 tree arg_type;
7701 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
7703 else
7704 /* The parameter to "atexit" is "void (*)(void)". */
7710 }
7713 }
7715 /* Returns a pointer to the `atexit' function. Note that if
7716 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
7717 `__cxa_atexit' function specified in the IA64 C++ ABI. */
7719 static tree
7721 {
7722 tree atexit_fndecl;
7723 tree fn_type;
7724 tree fn_ptr_type;
7732 {
7733 /* The declaration for `__cxa_atexit' is:
7735 int __cxa_atexit (void (*)(void *), void *, void *)
7737 We build up the argument types and then the function type
7738 itself. */
7742 /* First, build the pointer-to-function type for the first
7743 argument. */
7745 /* Then, build the rest of the argument types. */
7748 {
7751 }
7752 else
7753 {
7756 }
7757 /* And the final __cxa_atexit type. */
7760 NULL_TREE);
7763 else
7765 }
7766 else
7767 {
7768 /* The declaration for `atexit' is:
7770 int atexit (void (*)());
7772 We build up the argument types and then the function type
7773 itself. */
7775 /* Build the final atexit type. */
7779 }
7781 /* Now, build the function declaration. */
7789 }
7791 /* Like get_atexit_node, but for thread-local cleanups. */
7793 static tree
7795 {
7796 /* The declaration for `__cxa_thread_atexit' is:
7798 int __cxa_thread_atexit (void (*)(void *), void *, void *) */
7802 NULL_TREE);
7804 /* Now, build the function declaration. */
7808 }
7810 /* Returns the __dso_handle VAR_DECL. */
7812 static tree
7814 {
7818 /* Declare the variable. */
7820 ptr_type_node);
7822 #ifdef HAVE_GAS_HIDDEN
7824 {
7827 }
7828 #endif
7831 }
7833 /* Begin a new function with internal linkage whose job will be simply
7834 to destroy some particular variable. */
7838 static tree
7840 {
7842 tree fntype;
7843 tree fndecl;
7849 /* No need to mangle this. */
7852 /* Build the name of the function. */
7854 /* Build the function declaration. */
7857 /* It's a function with internal linkage, generated by the
7858 compiler. */
7861 /* Make the function `inline' so that it is only emitted if it is
7862 actually needed. It is unlikely that it will be inlined, since
7863 it is only called via a function pointer, but we avoid unnecessary
7864 emissions this way. */
7867 /* Build the parameter. */
7869 {
7874 }
7882 }
7884 /* Finish the cleanup function begun by start_cleanup_fn. */
7886 static void
7888 {
7892 }
7894 /* Generate code to handle the destruction of DECL, an object with
7895 static storage duration. */
7897 tree
7899 {
7900 tree cleanup;
7901 tree addr;
7902 tree compound_stmt;
7903 tree fcall;
7904 tree type;
7907 tree atex_node;
7913 /* If we're using "__cxa_atexit" (or "__cxa_thread_atexit" or
7914 "__aeabi_atexit"), and DECL is a class object, we can just pass the
7915 destructor to "__cxa_atexit"; we don't have to build a temporary
7916 function to do the cleanup. */
7917 dso_parm = (flag_use_cxa_atexit
7922 {
7925 /* Make sure it is accessible. */
7927 tf_warning_or_error);
7928 }
7929 else
7930 {
7931 /* Call build_cleanup before we enter the anonymous function so
7932 that any access checks will be done relative to the current
7933 scope, rather than the scope of the anonymous function. */
7936 /* Now start the function. */
7939 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
7940 to the original function, rather than the anonymous one. That
7941 will make the back end think that nested functions are in use,
7942 which causes confusion. */
7947 /* Create the body of the anonymous function. */
7952 }
7954 /* Call atexit with the cleanup function. */
7960 else
7964 {
7965 /* We must convert CLEANUP to the type that "__cxa_atexit"
7966 expects. */
7968 /* "__cxa_atexit" will pass the address of DECL to the
7969 cleanup function. */
7972 /* The declared type of the parameter to "__cxa_atexit" is
7973 "void *". For plain "T*", we could just let the
7974 machinery in cp_build_function_call convert it -- but if the
7975 type is "cv-qualified T *", then we need to convert it
7976 before passing it in, to avoid spurious errors. */
7978 }
7979 else
7980 /* Since the cleanup functions we build ignore the address
7981 they're given, there's no reason to pass the actual address
7982 in, and, in general, it's cheaper to pass NULL than any
7983 other value. */
7988 tf_warning_or_error);
7990 /* Just pass NULL to the dso handle parm if we don't actually
7991 have a DSO handle on this target. */
7993 else
7997 {
8000 {
8003 }
8004 else
8005 {
8008 }
8009 }
8010 else
8011 {
8014 }
8017 }
8019 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
8020 is its initializer. Generate code to handle the construction
8021 and destruction of DECL. */
8023 static void
8025 {
8029 /* Some variables require no dynamic initialization. */
8031 {
8032 /* Make sure the destructor is callable. */
8036 }
8040 {
8044 else
8049 {
8051 "C++11 %<thread_local%> allows dynamic initialization "
8054 }
8056 }
8059 {
8060 /* Emit code to perform this initialization but once. */
8065 /* We don't need thread-safety code for thread-local vars. */
8069 /* Emit code to perform this initialization but once. This code
8070 looks like:
8072 static <type> guard;
8073 if (!__atomic_load (guard.first_byte)) {
8074 if (__cxa_guard_acquire (&guard)) {
8075 bool flag = false;
8076 try {
8077 // Do initialization.
8078 flag = true; __cxa_guard_release (&guard);
8079 // Register variable for destruction at end of program.
8080 } catch {
8081 if (!flag) __cxa_guard_abort (&guard);
8082 }
8083 }
8084 }
8086 Note that the `flag' variable is only set to 1 *after* the
8087 initialization is complete. This ensures that an exception,
8088 thrown during the construction, will cause the variable to
8089 reinitialized when we pass through this code again, as per:
8091 [stmt.dcl]
8093 If the initialization exits by throwing an exception, the
8094 initialization is not complete, so it will be tried again
8095 the next time control enters the declaration.
8097 This process should be thread-safe, too; multiple threads
8098 should not be able to initialize the variable more than
8099 once. */
8101 /* Create the guard variable. */
8104 /* Begin the conditional initialization. */
8111 {
8124 acquire_fn = push_library_fn
8127 NULL_TREE),
8132 NULL_TREE);
8142 inner_if_stmt);
8150 void_node,
8154 /* Do the initialization itself. */
8156 init = add_stmt_to_compound
8158 init = add_stmt_to_compound
8160 }
8161 else
8164 /* Use atexit to register a function for destroying this static
8165 variable. */
8171 {
8175 }
8180 }
8183 else
8185 }
8187 \f
8188 /* Make TYPE a complete type based on INITIAL_VALUE.
8189 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
8190 2 if there was no information (in which case assume 0 if DO_DEFAULT),
8191 3 if the initializer list is empty (in pedantic mode). */
8193 int
8195 {
8199 /* Don't get confused by a CONSTRUCTOR for some other type. */
8206 {
8208 tree value;
8210 /* An array of character type can be initialized from a
8211 brace-enclosed string constant.
8213 FIXME: this code is duplicated from reshape_init. Probably
8214 we should just call reshape_init here? */
8218 {
8225 }
8227 /* If any of the elements are parameter packs, we can't actually
8228 complete this type now because the array size is dependent. */
8230 {
8233 {
8236 }
8237 }
8238 }
8242 /* We can create the array before the element type is complete, which
8243 means that we didn't have these two bits set in the original type
8244 either. In completing the type, we are expected to propagate these
8245 bits. See also complete_type which does the same thing for arrays
8246 of fixed size. */
8249 {
8254 }
8257 }
8259 /* As above, but either give an error or reject zero-size arrays, depending
8260 on COMPLAIN. */
8262 int
8265 {
8268 /* In SFINAE context we can't be lenient about zero-size arrays. */
8275 {
8281 {
8284 }
8288 }
8290 }
8291 \f
8292 /* Return zero if something is declared to be a member of type
8293 CTYPE when in the context of CUR_TYPE. STRING is the error
8294 message to print in that case. Otherwise, quietly return 1. */
8296 static int
8298 {
8300 {
8303 else
8306 }
8308 }
8309 \f
8310 /* Subroutine of `grokdeclarator'. */
8312 /* Generate errors possibly applicable for a given set of specifiers.
8313 This is for ARM $7.1.2. */
8315 static void
8323 {
8325 {
8362 }
8366 && !flag_noexcept_type
8372 }
8374 /* DECL is a member function or static data member and is presently
8375 being defined. Check that the definition is taking place in a
8376 valid namespace. */
8378 static void
8380 {
8381 /* These checks only apply to member functions and static data
8382 members. */
8384 /* We check for problems with specializations in pt.c in
8385 check_specialization_namespace, where we can issue better
8386 diagnostics. */
8389 /* We check this in check_explicit_instantiation_namespace. */
8392 /* [class.mfct]
8394 A member function definition that appears outside of the
8395 class definition shall appear in a namespace scope enclosing
8396 the class definition.
8398 [class.static.data]
8400 The definition for a static data member shall appear in a
8401 namespace scope enclosing the member's class definition. */
8405 }
8407 /* Build a PARM_DECL for the "this" parameter of FN. TYPE is the
8408 METHOD_TYPE for a non-static member function; QUALS are the
8409 cv-qualifiers that apply to the function. */
8411 tree
8413 {
8414 tree this_type;
8415 tree qual_type;
8416 tree parm;
8417 cp_cv_quals this_quals;
8420 {
8421 this_type
8424 }
8425 else
8427 /* The `this' parameter is implicitly `const'; it cannot be
8428 assigned to. */
8434 }
8436 /* DECL is a static member function. Complain if it was declared
8437 with function-cv-quals. */
8439 static void
8441 {
8444 decl);
8445 }
8447 // Check that FN takes no arguments and returns bool.
8448 static void
8450 {
8451 // A constraint is nullary.
8455 // The declared return type of the concept shall be bool, and
8456 // it shall not be deduced from it definition.
8462 }
8464 /* Helper function. Replace the temporary this parameter injected
8465 during cp_finish_omp_declare_simd with the real this parameter. */
8467 static tree
8469 {
8478 }
8480 /* CTYPE is class type, or null if non-class.
8481 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
8482 or METHOD_TYPE.
8483 DECLARATOR is the function's name.
8484 PARMS is a chain of PARM_DECLs for the function.
8485 VIRTUALP is truthvalue of whether the function is virtual or not.
8486 FLAGS are to be passed through to `grokclassfn'.
8487 QUALS are qualifiers indicating whether the function is `const'
8488 or `volatile'.
8489 RAISES is a list of exceptions that this function can raise.
8490 CHECK is 1 if we must find this method in CTYPE, 0 if we should
8491 not look, and -1 if we should not call `grokclassfn' at all.
8493 SFK is the kind of special function (if any) for the new function.
8495 Returns `NULL_TREE' if something goes wrong, after issuing
8496 applicable error messages. */
8498 static tree
8500 tree type,
8501 tree declarator,
8502 tree parms,
8503 tree orig_declarator,
8504 tree decl_reqs,
8507 cp_cv_quals quals,
8508 cp_ref_qualifier rqual,
8509 tree raises,
8515 special_function_kind sfk,
8518 tree in_namespace,
8520 location_t location)
8521 {
8522 tree decl;
8524 tree t;
8526 // Was the concept specifier present?
8529 // Concept declarations must have a corresponding definition.
8531 {
8534 }
8543 /* Set the constraints on the declaration. */
8545 {
8550 /* Adjust the required expression into a constraint. */
8556 }
8558 /* If we have an explicit location, use it, otherwise use whatever
8559 build_lang_decl used (probably input_location). */
8564 {
8569 /* Allocate space to hold the vptr bit if needed. */
8571 }
8577 /* Propagate volatile out from type to decl. */
8581 /* Setup decl according to sfk. */
8583 {
8596 }
8599 {
8602 orig_declarator);
8603 else
8604 {
8609 {
8610 /* Something like `template <class T> friend void f<T>()'. */
8613 orig_declarator);
8615 }
8618 /* A friend declaration of the form friend void f<>(). Record
8619 the information in the TEMPLATE_ID_EXPR. */
8628 {
8631 decl);
8633 }
8636 {
8639 decl);
8641 }
8642 }
8643 }
8645 /* If this decl has namespace scope, set that up. */
8651 /* `main' and builtins have implicit 'C' linkage. */
8666 /* Should probably propagate const out from type to decl I bet (mrs). */
8668 {
8671 }
8677 {
8681 }
8684 {
8695 }
8697 /* Members of anonymous types and local classes have no linkage; make
8698 them internal. If a typedef is made later, this will be changed. */
8704 {
8705 /* [basic.link]: A name with no linkage (notably, the name of a class
8706 or enumeration declared in a local scope) shall not be used to
8707 declare an entity with linkage.
8709 DR 757 relaxes this restriction for C++0x. */
8711 }
8715 {
8718 }
8720 /* If the declaration was declared inline, mark it as such. */
8722 {
8726 }
8730 // If the concept declaration specifier was found, check
8731 // that the declaration satisfies the necessary requirements.
8733 {
8736 }
8740 {
8743 TYPE_UNQUALIFIED,
8744 REF_QUAL_NONE);
8747 {
8751 decl);
8753 }
8756 {
8760 decl);
8762 }
8763 }
8766 {
8768 {
8772 }
8776 }
8781 {
8785 /* [over.literal]/6: Literal operators shall not have C linkage. */
8787 {
8791 }
8794 {
8797 {
8800 }
8804 {
8808 }
8810 {
8814 }
8815 }
8816 else
8817 {
8820 }
8821 }
8824 /* Make the init_value nonzero so pushdecl knows this is not
8825 tentative. error_mark_node is replaced later with the BLOCK. */
8832 {
8833 /* Adjust "omp declare simd" attributes. */
8836 {
8837 tree attr;
8840 {
8845 {
8847 cl = c_omp_declare_simd_clauses_to_numbers
8851 else
8853 }
8854 }
8855 }
8856 }
8858 /* Caller will do the rest of this. */
8865 /* 12.4/3 */
8873 template_count,
8884 {
8887 }
8889 /* Check main's type after attributes have been applied. */
8891 {
8893 integer_type_node))
8894 {
8896 tree newtype;
8900 }
8903 }
8906 {
8908 (processing_template_decl
8910 ? current_template_parms
8917 {
8918 tree ok;
8919 tree pushed_scope;
8922 /* Because grokfndecl is always supposed to return a
8923 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
8924 here. We depend on our callers to figure out that its
8925 really a template that's being returned. */
8930 {
8931 /* Remove the `this' parm added by grokclassfn. */
8934 }
8936 {
8939 }
8941 {
8946 }
8948 /* Since we've smashed OLD_DECL to its
8949 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
8953 /* Attempt to merge the declarations. This can fail, in
8954 the case of some invalid specialization declarations. */
8960 {
8964 }
8968 }
8969 }
8981 }
8983 /* decl is a FUNCTION_DECL.
8984 specifiers are the parsed virt-specifiers.
8986 Set flags to reflect the virt-specifiers.
8988 Returns decl. */
8990 static tree
8992 {
9000 }
9002 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
9003 the linkage that DECL will receive in the object file. */
9005 static void
9007 {
9008 /* A static data member always has static storage duration and
9009 external linkage. Note that static data members are forbidden in
9010 local classes -- the only situation in which a class has
9011 non-external linkage. */
9014 /* For non-template classes, static data members are always put
9015 out in exactly those files where they are defined, just as
9016 with ordinary namespace-scope variables. */
9019 }
9021 /* Create a VAR_DECL named NAME with the indicated TYPE.
9023 If SCOPE is non-NULL, it is the class type or namespace containing
9024 the variable. If SCOPE is NULL, the variable should is created in
9025 the innermost enclosing scope. */
9027 static tree
9029 tree name,
9030 tree orig_declarator,
9037 tree scope)
9038 {
9039 tree decl;
9040 tree explicit_scope;
9047 /* Compute the scope in which to place the variable, but remember
9048 whether or not that scope was explicitly specified by the user. */
9051 {
9052 /* An explicit "extern" specifier indicates a namespace-scope
9053 variable. */
9058 }
9062 template, we need DECL_LANG_SPECIFIC. */
9064 /* Similarly for namespace-scope variables with language linkage
9065 other than C++. */
9068 /* Similarly for static data members. */
9070 /* Similarly for explicit specializations. */
9071 || (orig_declarator
9074 else
9079 else
9083 {
9086 }
9089 {
9091 /* This function is only called with out-of-class definitions. */
9094 }
9095 /* At top level, either `static' or no s.c. makes a definition
9096 (perhaps tentative), and absence of `static' makes it public. */
9098 {
9101 || ! constp
9102 || volatilep
9105 }
9106 /* Not at top level, only `static' makes a static definition. */
9107 else
9108 {
9111 }
9114 {
9116 {
9120 }
9123 }
9125 /* If the type of the decl has no linkage, make sure that we'll
9126 notice that in mark_used. */
9135 {
9136 /* [basic.link]: A name with no linkage (notably, the name of a class
9137 or enumeration declared in a local scope) shall not be used to
9138 declare an entity with linkage.
9140 DR 757 relaxes this restriction for C++0x. */
9143 }
9144 else
9152 /* Check that the variable can be safely declared as a concept.
9153 Note that this also forbids explicit specializations. */
9155 {
9157 {
9160 }
9161 else
9166 }
9169 {
9173 }
9175 // Handle explicit specializations and instantiations of variable templates.
9181 }
9183 /* Create and return a canonical pointer to member function type, for
9184 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
9186 tree
9188 {
9190 tree t;
9195 /* Make sure that we always have the unqualified pointer-to-member
9196 type first. */
9198 {
9201 }
9203 /* If a canonical type already exists for this type, use it. We use
9204 this method instead of type_hash_canon, because it only does a
9205 simple equality check on the list of field members. */
9213 /* Let the front end know this is a pointer to member function. */
9220 delta_type_node);
9226 /* Zap out the name so that the back end will give us the debugging
9227 information for this anonymous RECORD_TYPE. */
9230 /* Cache this pointer-to-member type so that we can find it again
9231 later. */
9240 }
9242 /* Create and return a pointer to data member type. */
9244 tree
9246 {
9248 {
9253 }
9254 else
9255 {
9258 }
9259 }
9261 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
9262 Check to see that the definition is valid. Issue appropriate error
9263 messages. Return 1 if the definition is particularly bad, or 0
9264 otherwise. */
9266 static int
9268 {
9269 /* Avoid redundant diagnostics on out-of-class definitions. */
9272 /* Can't check yet if we don't know the type. */
9275 /* If DECL is declared constexpr, we'll do the appropriate checks
9276 in check_initializer. Similarly for inline static data members. */
9282 {
9285 "in-class initialization of static data member %q#D of "
9289 "%<constexpr%> needed for in-class initialization of "
9291 else
9293 "in-class initialization of static data member %q#D of "
9296 }
9298 /* Motion 10 at San Diego: If a static const integral data member is
9299 initialized with an integral constant expression, the initializer
9300 may appear either in the declaration (within the class), or in
9301 the definition, but not both. If it appears in the class, the
9302 member is a member constant. The file-scope definition is always
9303 required. */
9305 {
9307 "invalid in-class initialization of static data member "
9309 type);
9311 }
9314 "ISO C++ forbids in-class initialization of non-const "
9316 decl);
9319 "ISO C++ forbids initialization of member constant "
9323 }
9325 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
9326 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
9327 expressions out into temporary variables so that walk_tree doesn't
9328 step into them (c++/15764). */
9330 static tree
9332 {
9336 {
9342 }
9346 }
9348 /* Entry point for the above. */
9350 static void
9352 {
9354 /* Break out any function calls into temporary variables. */
9356 }
9358 /* Reduce a SIZEOF_EXPR to its value. */
9360 tree
9362 {
9363 tree r;
9370 else
9376 }
9378 /* Given the SIZE (i.e., number of elements) in an array, compute
9379 an appropriate index type for the array. If non-NULL, NAME is
9380 the name of the entity being declared. */
9382 tree
9384 {
9385 tree itype;
9392 {
9399 /* In C++98, we mark a non-constant array bound with a magic
9401 else
9402 {
9407 {
9410 {
9416 else
9419 }
9423 }
9430 }
9435 /* The array bound must be an integer type. */
9437 {
9442 else
9446 }
9447 }
9449 /* A type is dependent if it is...an array type constructed from any
9450 dependent type or whose size is specified by a constant expression
9451 that is value-dependent. */
9452 /* We can only call value_dependent_expression_p on integral constant
9453 expressions; treat non-constant expressions as dependent, too. */
9457 {
9458 /* We cannot do any checking for a SIZE that isn't known to be
9459 constant. Just build the index type and mark that it requires
9460 structural equality checks. */
9467 }
9470 {
9475 /* Use the folded result for VLAs, too; it will have resolved
9476 SIZEOF_EXPR. */
9478 }
9480 /* Normally, the array-bound will be a constant. */
9482 {
9483 /* Check to see if the array bound overflowed. Make that an
9484 error, no matter how generous we're being. */
9487 /* An array must have a positive number of elements. */
9489 {
9494 else
9497 }
9498 /* As an extension we allow zero-sized arrays. */
9500 {
9502 /* We must fail if performing argument deduction (as
9503 indicated by the state of complain), so that
9504 another substitution can be found. */
9510 else
9512 }
9513 }
9515 /* We don't allow VLAs at non-function scopes, or during
9516 tentative template substitution. */
9519 {
9522 /* `(int) &fn' is not a valid array bound. */
9525 name);
9526 else
9529 }
9531 {
9534 else
9536 }
9538 {
9542 else
9545 }
9548 /* A variable sized array. */
9550 else
9551 {
9552 /* Compute the index of the largest element in the array. It is
9553 one less than the number of elements in the array. We save
9554 and restore PROCESSING_TEMPLATE_DECL so that computations in
9555 cp_build_binary_op will be appropriately folded. */
9556 {
9557 processing_template_decl_sentinel s;
9559 MINUS_EXPR,
9562 complain),
9563 complain);
9565 }
9568 {
9569 /* A variable sized array. */
9576 {
9577 /* We have to add 1 -- in the ubsan routine we generate
9578 LE_EXPR rather than LT_EXPR. */
9583 }
9584 }
9585 /* Make sure that there was no overflow when creating to a signed
9586 index type. (For example, on a 32-bit machine, an array with
9587 size 2^32 - 1 is too big.) */
9590 {
9595 }
9596 }
9598 /* Create and return the appropriate index type. */
9601 /* If the index type were dependent, we would have returned early, so
9602 remember that it isn't. */
9606 }
9608 /* Returns the scope (if any) in which the entity declared by
9609 DECLARATOR will be located. If the entity was declared with an
9610 unqualified name, NULL_TREE is returned. */
9612 tree
9614 {
9618 /* If the declarator-id is a SCOPE_REF, the scope in which the
9619 declaration occurs is the first operand. */
9624 /* Otherwise, the declarator is not a qualified name; the entity will
9625 be declared in the current scope. */
9627 }
9629 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
9630 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
9631 with this type. */
9633 static tree
9635 {
9638 /* If things have already gone awry, bail now. */
9642 /* 8.3.4/1: If the type of the identifier of D contains the auto
9643 type-specifier, the program is ill-formed. */
9645 {
9648 }
9650 /* If there are some types which cannot be array elements,
9651 issue an error-message and return. */
9653 {
9657 else
9664 else
9671 else
9678 else
9684 }
9686 /* [dcl.array]
9688 The constant expressions that specify the bounds of the arrays
9689 can be omitted only for the first member of the sequence. */
9691 {
9695 name);
9696 else
9701 }
9703 /* Figure out the index type for the array. */
9707 /* [dcl.array]
9708 T is called the array element type; this type shall not be [...] an
9709 abstract class type. */
9713 }
9715 /* Returns the smallest location != UNKNOWN_LOCATION among the
9716 three stored in LOCATIONS[ds_const], LOCATIONS[ds_volatile],
9717 and LOCATIONS[ds_restrict]. */
9719 static location_t
9721 {
9736 }
9738 /* Check that it's OK to declare a function with the indicated TYPE
9739 and TYPE_QUALS. SFK indicates the kind of special function (if any)
9740 that this function is. OPTYPE is the type given in a conversion
9741 operator declaration, or the class type for a constructor/destructor.
9742 Returns the actual return type of the function; that may be different
9743 than TYPE if an error occurs, or for certain special functions. */
9745 static tree
9747 tree type,
9748 tree optype,
9751 {
9753 {
9763 else
9774 /* We can't use the proper return type here because we run into
9775 problems with ambiguous bases and covariant returns. */
9778 else
9787 "qualifiers are not allowed on declaration of "
9798 "qualifiers are not allowed on declaration of "
9809 }
9812 }
9814 /* A variable or data member (whose unqualified name is IDENTIFIER)
9815 has been declared with the indicated TYPE. If the TYPE is not
9816 acceptable, issue an error message and return a type to use for
9817 error-recovery purposes. */
9819 tree
9821 {
9823 {
9827 {
9830 }
9831 else
9834 }
9837 }
9839 /* Handle declaring DECL as an inline variable. */
9841 static void
9843 {
9846 {
9850 }
9853 "inline variables are only available "
9856 {
9859 }
9860 }
9863 /* Assign a typedef-given name to a class or enumeration type declared
9864 as anonymous at first. This was split out of grokdeclarator
9865 because it is also used in libcc1. */
9867 void
9869 {
9872 /* Replace the anonymous name with the real name everywhere. */
9874 {
9876 /* We do not rename the debug info representing the
9877 unnamed tagged type because the standard says in
9878 [dcl.typedef] that the naming applies only for
9879 linkage purposes. */
9880 /*debug_hooks->set_name (t, decl);*/
9882 }
9887 /* If this is a typedef within a template class, the nested
9888 type is a (non-primary) template. The name for the
9889 template needs updating as well. */
9894 /* Adjust linkage now that we aren't unnamed anymore. */
9897 /* FIXME remangle member functions; member functions of a
9898 type with external linkage have external linkage. */
9900 /* Check that our job is done, and that it would fail if we
9901 attempted to do it again. */
9903 }
9905 /* Given declspecs and a declarator (abstract or otherwise), determine
9906 the name and type of the object declared and construct a DECL node
9907 for it.
9909 DECLSPECS points to the representation of declaration-specifier
9910 sequence that precedes declarator.
9912 DECL_CONTEXT says which syntactic context this declaration is in:
9913 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
9914 FUNCDEF for a function definition. Like NORMAL but a few different
9915 error messages in each case. Return value may be zero meaning
9916 this definition is too screwy to try to parse.
9917 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
9918 handle member functions (which have FIELD context).
9919 Return value may be zero meaning this definition is too screwy to
9920 try to parse.
9921 PARM for a parameter declaration (either within a function prototype
9922 or before a function body). Make a PARM_DECL, or return void_type_node.
9923 TPARM for a template parameter declaration.
9924 CATCHPARM for a parameter declaration before a catch clause.
9925 TYPENAME if for a typename (in a cast or sizeof).
9926 Don't make a DECL node; just return the ..._TYPE node.
9927 FIELD for a struct or union field; make a FIELD_DECL.
9928 BITFIELD for a field with specified width.
9930 INITIALIZED is as for start_decl.
9932 ATTRLIST is a pointer to the list of attributes, which may be NULL
9933 if there are none; *ATTRLIST may be modified if attributes from inside
9934 the declarator should be applied to the declaration.
9936 When this function is called, scoping variables (such as
9937 CURRENT_CLASS_TYPE) should reflect the scope in which the
9938 declaration occurs, not the scope in which the new declaration will
9939 be placed. For example, on:
9941 void S::f() { ... }
9943 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
9944 should not be `S'.
9946 Returns a DECL (if a declarator is present), a TYPE (if there is no
9947 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
9948 error occurs. */
9950 tree
9956 {
9968 /* True if this declarator is a function definition. */
9972 #if 0
9973 /* See the code below that used this. */
9975 #endif
9977 /* Keep track of what sort of function is being processed
9978 so that we can warn about default return values, or explicit
9979 return values which do not match prescribed defaults. */
9985 /* cv-qualifiers that apply to the declarator, for a declaration of
9986 a member function. */
9988 /* virt-specifiers that apply to the declarator, for a declaration of
9989 a member function. */
9991 /* ref-qualifier that applies to the declarator, for a declaration of
9992 a member function. */
9994 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
10001 /* The unqualified name of the declarator; either an
10002 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
10003 tree unqualified_id;
10004 /* The class type, if any, in which this entity is located,
10005 or NULL_TREE if none. Note that this value may be different from
10006 the current class type; for example if an attempt is made to declare
10007 "A::f" inside "B", this value will be "A". */
10009 /* The NAMESPACE_DECL for the namespace in which this entity is
10010 located. If an unqualified name is used to declare the entity,
10011 this value will be NULL_TREE, even if the entity is located at
10012 namespace scope. */
10014 cp_storage_class storage_class;
10035 // Was concept_p specified? Note that ds_concept
10036 // implies ds_constexpr!
10069 /* Look inside a declarator for the name being declared
10070 and get it as a string, for an error message. */
10072 id_declarator;
10074 {
10079 {
10083 {
10087 }
10091 {
10097 {
10099 {
10100 /* [dcl.meaning]
10102 A declarator-id shall not be qualified except
10103 for ...
10105 None of the cases are permitted in block
10106 scope. */
10109 decl);
10113 else
10117 }
10119 {
10122 {
10125 }
10127 && current_class_type
10129 current_class_type))
10130 {
10134 }
10135 }
10138 }
10140 {
10142 {
10144 {
10147 }
10150 {
10153 }
10160 }
10164 {
10170 }
10171 /* Fall through. */
10178 {
10180 dname);
10182 }
10185 else
10186 {
10193 else
10195 }
10200 }
10202 }
10219 }
10222 }
10224 /* [dcl.fct.edf]
10226 The declarator in a function-definition shall have the form
10227 D1 ( parameter-declaration-clause) ... */
10229 {
10232 }
10237 {
10240 }
10243 {
10246 {
10249 }
10252 {
10254 {
10257 }
10259 {
10262 }
10263 }
10264 }
10266 /* Anything declared one level down from the top level
10267 must be one of the parameters of a function
10268 (because the body is at least two levels down). */
10270 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
10271 by not allowing C++ class definitions to specify their parameters
10272 with xdecls (must be spec.d in the parmlist).
10274 Since we now wait to push a class scope until we are sure that
10275 we are in a legitimate method context, we must set oldcname
10276 explicitly (since current_class_name is not yet alive).
10278 We also want to avoid calling this a PARM if it is in a namespace. */
10281 {
10287 }
10293 {
10296 }
10299 {
10302 }
10304 /* If there were multiple types specified in the decl-specifier-seq,
10305 issue an error message. */
10307 {
10310 }
10313 {
10316 }
10318 /* Extract the basic type from the decl-specifier-seq. */
10321 {
10324 }
10325 /* If the entire declaration is itself tagged as deprecated then
10326 suppress reports of deprecated items. */
10331 {
10338 }
10339 /* No type at all: default to `int', and set DEFAULTED_INT
10340 because it was not a user-defined typedef. */
10342 {
10344 {
10345 /* These imply 'int'. */
10348 }
10349 /* If we just have "complex", it is equivalent to "complex double". */
10352 {
10355 "ISO C++ does not support plain %<complex%> meaning "
10357 }
10358 }
10359 /* Gather flags. */
10363 #if 0
10364 /* See the code below that used this. */
10367 #endif
10372 else
10376 {
10378 ctor_return_type,
10379 type_quals,
10382 }
10384 {
10389 /* We handle `main' specially here, because 'main () { }' is so
10390 common. With no options, it is allowed. With -Wreturn-type,
10391 it is a warning. It is only an error with -pedantic-errors. */
10392 is_main = (funcdef_flag
10408 else
10413 /* FIXME we should be able to propagate the error_mark_node as is
10414 for other contexts too. */
10416 else
10418 }
10423 {
10425 {
10429 }
10434 }
10436 /* Now process the modifiers that were specified
10437 and check for invalid combinations. */
10439 /* Long double is a special combination. */
10441 {
10445 }
10447 /* Check all other uses of type modifiers. */
10450 {
10472 {
10477 }
10478 else
10479 {
10482 {
10485 name);
10488 }
10489 }
10491 /* Discard the type modifiers if they are invalid. */
10493 {
10499 }
10500 }
10502 /* Decide whether an integer type is signed or not.
10503 Optionally treat bitfields as signed by default. */
10505 /* [class.bit]
10507 It is implementation-defined whether a plain (neither
10508 explicitly signed or unsigned) char, short, int, or long
10509 bit-field is signed or unsigned.
10511 Naturally, we extend this to long long as well. Note that
10512 this does not include wchar_t. */
10514 && !signed_p
10515 /* A typedef for plain `int' without `signed' can be
10516 controlled just like plain `int', but a typedef for
10517 `signed int' cannot be so controlled. */
10518 && !(typedef_decl
10522 {
10535 else
10537 }
10550 {
10553 /* If a modifier is specified, the resulting complex is the complex
10554 form of TYPE. E.g, "complex short" is "complex short int". */
10563 else
10565 }
10567 /* If we're using the injected-class-name to form a compound type or a
10568 declaration, replace it with the underlying class so we don't get
10569 redundant typedefs in the debug output. But if we are returning the
10570 type unchanged, leave it alone so that it's available to
10571 maybe_get_template_decl_from_type_decl. */
10579 type = cp_build_qualified_type_real
10583 /* We might have ignored or rejected some of the qualifiers. */
10590 {
10594 }
10606 {
10608 {
10613 }
10617 }
10620 /* Issue errors about use of storage classes for parameters. */
10622 {
10624 {
10627 }
10629 {
10632 }
10638 /* Function parameters cannot be concept. */
10641 /* Function parameters cannot be constexpr. If we saw one, moan
10642 and pretend it wasn't there. */
10644 {
10647 }
10648 }
10650 /* Give error if `virtual' is used outside of class declaration. */
10653 {
10657 }
10660 {
10675 declspecs->gnu_thread_keyword_p
10681 {
10706 }
10709 {
10711 {
10715 "type must be cv-qualified %<auto%> or reference to "
10717 }
10720 }
10730 }
10732 /* Static anonymous unions are dealt with here. */
10738 /* Warn about storage classes that are invalid for certain
10739 kinds of declarations (parameters, typenames, etc.). */
10741 && ((storage_class
10745 {
10748 }
10753 {
10757 ;
10759 ;
10761 /* C++ allows static class elements. */
10763 /* C++ also allows inlines and signed and unsigned elements,
10764 but in those cases we don't come in here. */
10765 ;
10766 else
10767 {
10770 else
10771 {
10774 else
10776 }
10782 }
10783 }
10788 {
10791 }
10795 {
10800 /* When thread_local is applied to a variable of block scope the
10801 storage-class-specifier static is implied if it does not appear
10802 explicitly. */
10805 }
10808 {
10812 }
10816 else
10817 {
10820 {
10833 }
10834 }
10837 {
10838 /* Apply the c++11 attributes to the type preceding them. */
10842 }
10844 /* Determine the type of the entity declared by recurring on the
10845 declarator. */
10847 {
10849 tree attrs;
10856 {
10868 attr_flags);
10869 }
10873 /* We don't want to warn in parameter context because we don't
10874 yet know if the parse will succeed, and this might turn out
10875 to be a constructor call. */
10879 /* If the type is class-like and the inner name used a
10880 global namespace qualifier, we need the parens.
10881 Unfortunately all we can tell is whether a qualified name
10882 was used or not. */
10883 && !(inner_declarator
10894 {
10902 /* [dcl.array]/1:
10904 The optional attribute-specifier-seq appertains to the
10905 array. */
10911 {
10912 tree arg_types;
10915 /* Declaring a function type. */
10921 /* Pick up type qualifiers which should be applied to `this'. */
10923 /* Pick up virt-specifiers. */
10925 /* And ref-qualifier, too */
10927 /* And tx-qualifier. */
10929 /* Pick up the exception specifications. */
10931 /* If the exception-specification is ill-formed, let's pretend
10932 there wasn't one. */
10940 /* Say it's a definition only for the CALL_EXPR
10941 closest to the identifier. */
10944 /* Handle a late-specified return type. */
10947 {
10949 {
10951 {
10956 {
10958 "%<auto%> type specifier without trailing "
10961 "only available with -std=c++14 or "
10963 }
10965 {
10969 }
10970 }
10972 {
10977 }
10979 {
10981 {
10984 "for %qT must have trailing return "
10986 else
10989 type);
10992 }
10998 else
11002 }
11003 }
11006 {
11008 /* Not using maybe_warn_cpp0x because this should
11009 always be an error. */
11012 else
11016 }
11017 }
11023 {
11026 }
11029 {
11033 /* We now know that the TYPE_QUALS don't apply to the
11034 decl, but to its return type. */
11036 }
11038 /* Error about some types functions can't return. */
11041 {
11045 }
11047 {
11051 }
11055 && funcdecl_p
11061 {
11062 /* We are within a class's scope. If our declarator name
11063 is the same as the class name, and we are defining
11064 a function, then it is a constructor/destructor, and
11065 therefore returns a void type. */
11067 /* ISO C++ 12.4/2. A destructor may not be declared
11068 const or volatile. A destructor may not be static.
11069 A destructor may not be declared with ref-qualifier.
11071 ISO C++ 12.1. A constructor may not be declared
11072 const or volatile. A constructor may not be
11073 virtual. A constructor may not be static.
11074 A constructor may not be declared with ref-qualifier. */
11080 {
11085 }
11088 {
11094 }
11098 current_class_type,
11099 flags))
11103 {
11104 /* It's a constructor. */
11108 {
11112 }
11116 }
11119 }
11121 {
11123 {
11124 /* Cannot be both friend and virtual. */
11127 }
11133 name);
11134 }
11136 {
11138 {
11141 }
11144 }
11146 {
11149 }
11158 {
11162 }
11168 {
11170 /* transaction_safe applies to the type, but
11171 transaction_safe_dynamic applies to the function. */
11174 else
11176 }
11178 /* [dcl.fct]/2:
11180 The optional attribute-specifier-seq appertains to
11181 the function type. */
11186 }
11192 /* Filter out pointers-to-references and references-to-references.
11193 We can get these if a TYPE_DECL is used. */
11196 {
11198 {
11201 }
11203 /* In C++0x, we allow reference to reference declarations
11204 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
11205 and template type arguments [14.3.1/4 temp.arg.type]. The
11206 check for direct reference to reference declarations, which
11207 are still forbidden, occurs below. Reasoning behind the change
11208 can be found in DR106, DR540, and the rvalue reference
11209 proposals. */
11211 {
11214 }
11215 }
11217 {
11222 }
11224 /* We now know that the TYPE_QUALS don't apply to the decl,
11225 but to the target of the pointer. */
11228 /* This code used to handle METHOD_TYPE, but I don't think it's
11229 possible to get it here anymore. */
11233 {
11237 memfn_quals,
11238 rqual);
11244 }
11252 type);
11254 /* When the pointed-to type involves components of variable size,
11255 care must be taken to ensure that the size evaluation code is
11256 emitted early enough to dominate all the possible later uses
11257 and late enough for the variables on which it depends to have
11258 been assigned.
11260 This is expected to happen automatically when the pointed-to
11261 type has a name/declaration of it's own, but special attention
11262 is required if the type is anonymous.
11264 We handle the NORMAL and FIELD contexts here by inserting a
11265 dummy statement that just evaluates the size at a safe point
11266 and ensures it is not deferred until e.g. within a deeper
11267 conditional context (c++/43555).
11269 We expect nothing to be needed here for PARM or TYPENAME.
11270 Evaluating the size at this point for TYPENAME would
11271 actually be incorrect, as we might be in the middle of an
11272 expression with side effects on the pointed-to type size
11273 "arguments" prior to the pointer declaration point and the
11274 size evaluation could end up prior to the side effects. */
11280 {
11284 }
11287 {
11288 /* In C++0x, the type we are creating a reference to might be
11289 a typedef which is itself a reference type. In that case,
11290 we follow the reference collapsing rules in
11291 [7.1.3/8 dcl.typedef] to create the final reference type:
11293 "If a typedef TD names a type that is a reference to a type
11294 T, an attempt to create the type 'lvalue reference to cv TD'
11295 creates the type 'lvalue reference to T,' while an attempt
11296 to create the type "rvalue reference to cv TD' creates the
11297 type TD."
11298 */
11302 {
11305 else
11307 }
11308 else
11309 type = cp_build_reference_type
11312 /* In C++0x, we need this check for direct reference to
11313 reference declarations, which are forbidden by
11314 [8.3.2/5 dcl.ref]. Reference to reference declarations
11315 are only allowed indirectly through typedefs and template
11316 type arguments. Example:
11318 void foo(int & &); // invalid ref-to-ref decl
11320 typedef int & int_ref;
11321 void foo(int_ref &); // valid ref-to-ref decl
11322 */
11326 }
11330 {
11334 /* We will already have complained. */
11336 else
11338 type);
11339 }
11340 else
11343 /* Process a list of type modifier keywords (such as
11344 const or volatile) that were given inside the `*' or `&'. */
11347 {
11348 type
11352 }
11354 /* Apply C++11 attributes to the pointer, and not to the
11355 type pointed to. This is unlike what is done for GNU
11356 attributes above. It is to comply with [dcl.ptr]/1:
11358 [the optional attribute-specifier-seq (7.6.1) appertains
11359 to the pointer and not to the object pointed to]. */
11372 }
11373 }
11375 /* A `constexpr' specifier used in an object declaration declares
11376 the object as `const'. */
11378 {
11379 /* DR1688 says that a `constexpr' specifier in combination with
11380 `volatile' is valid. */
11383 {
11386 }
11387 }
11393 {
11395 unqualified_id);
11397 }
11399 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
11400 qualified with a class-name, turn it into a METHOD_TYPE, unless
11401 we know that the function is static. We take advantage of this
11402 opportunity to do other processing that pertains to entities
11403 explicitly declared to be class members. Note that if DECLARATOR
11404 is non-NULL, we know it is a cdk_id declarator; otherwise, we
11405 would not have exited the loop above. */
11410 {
11416 {
11418 {
11422 }
11423 else
11427 }
11429 can skip the following checks. */
11432 qualifying type must certainly be complete. */
11433 funcdef_flag
11434 /* A friend declaration of "T::f" is OK, even if
11435 "T" is a template parameter. But, if this
11436 function is not a friend, the qualifying type
11437 must be a class. */
11439 /* For a declaration, the type need not be
11440 complete, if either it is dependent (since there
11441 is no meaningful definition of complete in that
11442 case) or the qualifying class is currently being
11443 defined. */
11446 /* Check that the qualifying type is complete. */
11450 {
11453 {
11461 }
11462 }
11464 {
11468 }
11469 }
11474 /* Now TYPE has the actual type. */
11477 {
11480 else
11482 }
11488 /* [dcl.meaning]/1: The optional attribute-specifier-seq following
11489 a declarator-id appertains to the entity that is declared. */
11492 /* Handle parameter packs. */
11494 {
11496 /* Turn the type into a pack expansion.*/
11498 else
11500 }
11503 && !processing_template_decl
11505 {
11508 else
11511 }
11514 {
11515 /* [dcl.fct.spec] (C++11) The explicit specifier shall be used only
11516 in the declaration of a constructor or conversion function within
11517 a class definition. */
11524 else
11526 "only declarations of constructors and conversion operators "
11529 }
11532 {
11534 {
11537 }
11539 {
11542 }
11545 {
11548 }
11550 {
11553 }
11555 {
11558 }
11560 {
11564 }
11565 }
11567 /* If this is declaring a typedef name, return a TYPE_DECL. */
11569 {
11570 tree decl;
11572 /* This declaration:
11574 typedef void f(int) const;
11576 declares a function type which is not a member of any
11577 particular class, but which is cv-qualified; for
11578 example "f S::*" declares a pointer to a const-qualified
11579 member function of S. We record the cv-qualification in the
11580 function type. */
11582 {
11585 /* We have now dealt with these qualifiers. */
11588 }
11591 {
11594 }
11601 else
11607 }
11610 {
11614 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
11616 /* The TYPE_DECL is "abstract" because there will be
11617 clones of this constructor/destructor, and there will
11618 be copies of this TYPE_DECL generated in those
11619 clones. The decloning optimization (for space) may
11620 revert this subsequently if it determines that
11621 the clones should share a common implementation. */
11623 }
11628 unqualified_id);
11630 /* If the user declares "typedef struct {...} foo" then the
11631 struct will have an anonymous name. Fill that name in now.
11632 Nothing can refer to it, so nothing needs know about the name
11633 change. */
11635 && unqualified_id
11653 /* Acknowledge that this was written:
11654 `using analias = atype;'. */
11658 }
11660 /* Detect the case of an array type of unspecified size
11661 which came, as such, direct from a typedef name.
11662 We must copy the type, so that the array's domain can be
11663 individually set by the object's initializer. */
11670 /* Detect where we're using a typedef of function type to declare a
11671 function. PARMS will not be set, so we must create it now. */
11674 {
11676 tree args;
11681 {
11687 }
11692 {
11693 /* The qualifiers on the function type become the qualifiers on
11694 the non-static member function. */
11698 }
11699 }
11701 /* If this is a type name (such as, in a cast or sizeof),
11702 compute the type and return it now. */
11705 {
11706 /* Note that here we don't care about type_quals. */
11708 /* Special case: "friend class foo" looks like a TYPENAME context. */
11710 {
11712 {
11715 }
11718 {
11719 /* Don't allow friend declaration without a class-key. */
11726 else
11729 type);
11730 }
11732 /* Only try to do this stuff if we didn't already give up. */
11734 {
11735 /* A friendly class? */
11739 else
11741 type);
11744 }
11745 }
11747 {
11754 /* Core issue #547: need to allow this in template type args.
11755 Allow it in general in C++11 for alias-declarations. */
11759 else
11761 }
11767 }
11771 && ! bitfield
11773 {
11776 }
11779 {
11780 /* Only functions may be declared using an operator-function-id. */
11782 {
11785 }
11790 type);
11791 }
11793 /* We don't check parameter types here because we can emit a better
11794 error message later. */
11796 {
11800 }
11802 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
11803 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
11806 {
11812 {
11815 else
11818 }
11820 /* A parameter declared as an array of T is really a pointer to T.
11821 One declared as a function is really a pointer to a function.
11822 One declared as a member is really a pointer to member. */
11825 {
11826 /* Transfer const-ness of array into that of type pointed to. */
11830 }
11833 }
11838 {
11844 }
11846 {
11850 {
11857 }
11859 {
11862 {
11868 else
11872 }
11874 /* The C99 flexible array extension. */
11877 {
11881 {
11884 }
11885 else
11886 {
11887 /* Array is a flexible member. */
11889 /* Do not warn on flexible array members in system
11894 else
11898 /* Flexible array member has a null domain. */
11900 }
11901 }
11904 {
11905 /* Happens when declaring arrays of sizes which
11906 are error_mark_node, for example. */
11908 }
11910 {
11911 /* Something like struct S { int N::j; }; */
11914 }
11917 {
11919 tree function_context;
11922 {
11923 /* This should never happen in pure C++ (the check
11924 could be an assert). It could happen in
11925 Objective-C++ if someone writes invalid code that
11926 uses a function declaration for an instance
11927 variable or property (instance variables and
11928 properties are parsed as FIELD_DECLs, but they are
11929 part of an Objective-C class, not a C++ class).
11930 That code is invalid and is caught by this
11931 check. */
11933 {
11935 unqualified_id);
11937 }
11939 /* ``A union may [ ... ] not [ have ] virtual functions.''
11940 ARM 9.5 */
11942 {
11944 unqualified_id);
11946 }
11951 {
11955 }
11956 }
11958 /* Check that the name used for a destructor makes sense. */
11960 {
11964 {
11969 }
11972 {
11976 }
11978 {
11981 }
11983 {
11986 }
11987 }
11989 {
11994 }
11997 {
12000 }
12002 {
12005 }
12008 {
12011 {
12017 }
12018 }
12020 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
12032 parms,
12033 unqualified_id,
12034 reqs,
12044 #if 0
12045 /* This clobbers the attrs stored in `decl' from `attrlist'. */
12046 /* The decl and setting of decl_attr is also turned off. */
12048 #endif
12050 /* [class.conv.ctor]
12052 A constructor declared without the function-specifier
12053 explicit that can be called with a single parameter
12054 specifies a conversion from the type of its first
12055 parameter to the type of its class. Such a constructor
12056 is called a converting constructor. */
12059 }
12064 {
12067 {
12069 {
12073 }
12074 else
12079 }
12080 }
12081 else
12082 {
12084 {
12088 }
12090 }
12093 {
12094 /* Friends are treated specially. */
12098 {
12100 {
12101 decl = check_explicit_specialization
12106 }
12110 funcdef_flag);
12112 }
12113 else
12115 }
12117 /* Structure field. It may not be a function, except for C++. */
12120 {
12122 {
12123 /* C++ allows static class members. All other work
12124 for this is done by grokfield. */
12132 unqualified_id);
12134 {
12138 }
12145 /* Even if there is an in-class initialization, DECL
12146 is considered undefined until an out-of-class
12147 definition is provided, unless this is an inline
12148 variable. */
12152 {
12158 }
12159 }
12160 else
12161 {
12164 unqualified_id);
12166 {
12168 unqualified_id);
12170 }
12175 {
12178 }
12181 {
12184 }
12187 {
12188 /* An attempt is being made to initialize a non-static
12189 member. This is new in C++11. */
12192 /* If this has been parsed with static storage class, but
12193 errors forced staticp to be cleared, ensure NSDMI is
12194 not present. */
12197 }
12198 }
12204 }
12205 }
12208 {
12209 tree original_name;
12217 else
12219 // FIXME:gcc_assert (original_name == dname);
12226 {
12229 name);
12230 else
12232 name);
12233 }
12237 /* Function declaration not at top level.
12238 Storage classes other than `extern' are not allowed
12239 and `extern' makes no difference. */
12244 {
12247 "%<static%> specifier invalid for function %qs "
12249 else
12251 "%<inline%> specifier invalid for function %qs "
12253 }
12256 {
12258 {
12261 }
12264 {
12269 }
12270 }
12272 /* Record whether the function is public. */
12282 publicp,
12285 sfk,
12286 funcdef_flag,
12295 {
12298 /* Don't allow a static member function in a class, and forbid
12299 declaring main to be static. */
12301 {
12305 }
12307 {
12308 /* 7.1.1: There can be no static function declarations within a
12309 block. */
12312 }
12315 {
12318 }
12319 }
12320 }
12321 else
12322 {
12323 /* It's a variable. */
12325 /* An uninitialized decl with `extern' is a reference. */
12327 declspecs,
12328 initialized,
12329 type_quals,
12330 inlinep,
12331 concept_p,
12332 template_count,
12342 {
12345 {
12350 }
12352 {
12355 }
12357 {
12359 "cannot explicitly declare member %q#D to have "
12362 }
12363 }
12365 {
12369 }
12374 {
12379 }
12380 }
12385 {
12389 }
12392 {
12394 {
12395 /* It's common practice (and completely valid) to have a const
12396 be initialized and declared extern. */
12399 }
12400 else
12401 {
12404 }
12405 }
12407 /* Record `register' declaration for warnings on &
12408 and in case doing stupid register allocation. */
12411 {
12413 /* Warn about register storage specifiers on PARM_DECLs. */
12415 {
12418 "ISO C++17 does not allow %<register%> storage "
12420 else
12423 }
12424 }
12430 /* Set constexpr flag on vars (functions got it in grokfndecl). */
12434 /* Record constancy and volatility on the DECL itself . There's
12435 no need to do this when processing a template; we'll do this
12436 for the instantiated declaration based on the type of DECL. */
12441 }
12442 }
12443 \f
12444 /* Subroutine of start_function. Ensure that each of the parameter
12445 types (as listed in PARMS) is complete, as is required for a
12446 function definition. */
12448 static void
12450 {
12452 {
12457 {
12463 }
12464 else
12465 /* grokparms or complete_type_or_else will have already issued
12466 an error. */
12468 }
12469 }
12471 /* Returns nonzero if T is a local variable. */
12473 int
12475 {
12477 /* A VAR_DECL with a context that is a _TYPE is a static data
12478 member. */
12480 /* Any other non-local variable must be at namespace scope. */
12486 }
12488 /* Like local_variable_p, but suitable for use as a tree-walking
12489 function. */
12491 static tree
12494 {
12502 }
12504 /* Check that ARG, which is a default-argument expression for a
12505 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
12506 something goes wrong. DECL may also be a _TYPE node, rather than a
12507 DECL, if there is no DECL available. */
12509 tree
12511 {
12512 tree var;
12513 tree decl_type;
12516 /* We get a DEFAULT_ARG when looking at an in-class declaration
12517 with a default argument. Ignore the argument for now; we'll
12518 deal with it after the class is complete. */
12522 {
12525 }
12526 else
12533 /* Something already went wrong. There's no need to check
12534 further. */
12537 /* [dcl.fct.default]
12539 A default argument expression is implicitly converted to the
12540 parameter type. */
12543 LOOKUP_IMPLICIT);
12546 /* Avoid redundant -Wzero-as-null-pointer-constant warnings at
12547 the call sites. */
12552 /* [dcl.fct.default]
12554 Local variables shall not be used in default argument
12555 expressions.
12557 The keyword `this' shall not be used in a default argument of a
12558 member function. */
12561 {
12563 {
12567 else
12569 }
12571 }
12573 /* All is well. */
12575 }
12577 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
12579 static tree
12581 {
12586 {
12589 else
12591 }
12593 /* Do warn about using typedefs to a deprecated class. */
12605 return type_is_deprecated
12609 }
12611 /* Decode the list of parameter types for a function type.
12612 Given the list of things declared inside the parens,
12613 return a list of types.
12615 If this parameter does not end with an ellipsis, we append
12616 void_list_node.
12618 *PARMS is set to the chain of PARM_DECLs created. */
12620 tree
12622 {
12625 tree parm;
12629 {
12642 {
12644 && !init
12647 /* DR 577: A parameter list consisting of a single
12648 unnamed parameter of non-dependent type 'void'. */
12652 "invalid use of cv-qualified type %qT in "
12654 else
12656 "invalid use of type %<void%> in parameter "
12658 /* It's not a good idea to actually create parameters of
12659 type `void'; other parts of the compiler assume that a
12660 void type terminates the parameter list. */
12663 }
12666 {
12668 {
12672 }
12674 /* Top-level qualifiers on the parameters are
12675 ignored for function types. */
12678 {
12682 }
12686 {
12687 /* Before C++17 DR 393:
12688 [dcl.fct]/6, parameter types cannot contain pointers
12689 (references) to arrays of unknown bound. */
12694 {
12702 }
12705 ptr
12711 }
12717 }
12722 }
12730 }
12732 \f
12733 /* D is a constructor or overloaded `operator='.
12735 Let T be the class in which D is declared. Then, this function
12736 returns:
12738 -1 if D's is an ill-formed constructor or copy assignment operator
12739 whose first parameter is of type `T'.
12740 0 if D is not a copy constructor or copy assignment
12741 operator.
12742 1 if D is a copy constructor or copy assignment operator whose
12743 first parameter is a reference to non-const qualified T.
12744 2 if D is a copy constructor or copy assignment operator whose
12745 first parameter is a reference to const qualified T.
12747 This function can be used as a predicate. Positive values indicate
12748 a copy constructor and nonzero values indicate a copy assignment
12749 operator. */
12751 int
12753 {
12754 tree args;
12755 tree arg_type;
12763 /* Instantiations of template member functions are never copy
12764 functions. Note that member functions of templated classes are
12765 represented as template functions internally, and we must
12766 accept those as copy functions. */
12778 {
12779 /* Pass by value copy assignment operator. */
12781 }
12785 {
12788 }
12789 else
12795 /* There are more non-optional args. */
12799 }
12801 /* D is a constructor or overloaded `operator='.
12803 Let T be the class in which D is declared. Then, this function
12804 returns true when D is a move constructor or move assignment
12805 operator, false otherwise. */
12807 bool
12809 {
12813 /* There are no move constructors if we are in C++98 mode. */
12819 /* Instantiations of template member functions are never move
12820 functions. Note that member functions of templated classes are
12821 represented as template functions internally, and we must
12822 accept those as move functions. */
12826 }
12828 /* D is a constructor or overloaded `operator='.
12830 Then, this function returns true when D has the same signature as a move
12831 constructor or move assignment operator (because either it is such a
12832 ctor/op= or it is a template specialization with the same signature),
12833 false otherwise. */
12835 bool
12837 {
12838 tree args;
12839 tree arg_type;
12859 /* There are more non-optional args. */
12863 }
12865 /* Remember any special properties of member function DECL. */
12867 void
12869 {
12870 tree class_type;
12877 {
12884 {
12885 /* [class.copy]
12887 A non-template constructor for class X is a copy
12888 constructor if its first parameter is of type X&, const
12889 X&, volatile X& or const volatile X&, and either there
12890 are no other parameters or else all other parameters have
12891 default arguments. */
12897 }
12908 }
12910 {
12911 /* [class.copy]
12913 A non-template assignment operator for class X is a copy
12914 assignment operator if its parameter is of type X, X&, const
12915 X&, volatile X& or const volatile X&. */
12920 {
12926 }
12929 }
12933 /* Destructors are handled in check_methods. */
12934 }
12936 /* Check a constructor DECL has the correct form. Complains
12937 if the class has a constructor of the form X(X). */
12939 bool
12941 {
12945 {
12946 /* [class.copy]
12948 A declaration of a constructor for a class X is ill-formed if
12949 its first parameter is of type (optionally cv-qualified) X
12950 and either there are no other parameters or else all other
12951 parameters have default arguments.
12953 We *don't* complain about member template instantiations that
12954 have this form, though; they can occur as we try to decide
12955 what constructor to use during overload resolution. Since
12956 overload resolution will never prefer such a constructor to
12957 the non-template copy constructor (which is either explicitly
12958 or implicitly defined), there's no need to worry about their
12959 existence. Theoretically, they should never even be
12960 instantiated, but that's hard to forestall. */
12964 }
12967 }
12969 /* DECL is a declaration for an overloaded or conversion operator. If
12970 COMPLAIN is true, errors are issued for invalid declarations. */
12972 bool
12974 {
12983 tree_code operator_code;
12986 {
12987 /* Conversion operators are TYPE_EXPR for the purposes of this
12988 function. */
12991 }
12992 else
12993 {
13000 }
13003 {
13004 /* operator new and operator delete are quite special. */
13007 {
13026 }
13028 /* [basic.std.dynamic.allocation]/1:
13030 A program is ill-formed if an allocation function is declared
13031 in a namespace scope other than global scope or declared
13032 static in global scope.
13034 The same also holds true for deallocation functions. */
13036 {
13038 {
13041 }
13044 {
13047 }
13048 }
13052 else
13053 {
13056 }
13059 }
13061 /* An operator function must either be a non-static member function
13062 or have at least one parameter of a class, a reference to a class,
13063 an enumeration, or a reference to an enumeration. 13.4.0.6 */
13065 {
13071 {
13074 }
13077 {
13081 }
13084 {
13086 {
13091 }
13097 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
13098 because these checks are performed even on template
13099 functions. */
13103 }
13104 }
13107 /* There are no further restrictions on the arguments to an overloaded
13108 "operator ()". */
13112 {
13113 /* 13.4.0.3 */
13116 }
13118 /* Count the number of arguments and check for ellipsis. */
13121 {
13123 {
13124 /* Variadic. */
13127 }
13129 }
13131 /* Verify correct number of arguments. */
13133 {
13136 {
13137 /* We have a unary instance of an ambi-ary op. Remap to the
13138 unary one. */
13144 }
13146 {
13147 /* This was an ambiguous operator but is invalid. */
13152 }
13155 && ! processing_template_decl
13156 /* x++ and x--'s second argument must be an int. */
13158 integer_type_node))
13159 {
13163 decl);
13165 }
13170 {
13175 }
13180 {
13185 }
13190 }
13192 /* There can be no default arguments. */
13195 {
13201 else
13202 {
13205 }
13206 }
13208 /* At this point the declaration is well-formed. It may not be
13209 sensible though. */
13211 /* Check member function warnings only on the in-class declaration.
13212 There's no point warning on an out-of-class definition. */
13216 /* Warn about conversion operators that will never be used. */
13220 {
13229 ref
13235 {
13238 ref
13243 /* Don't force t to be complete here. */
13248 ref
13253 }
13254 }
13259 /* Effective C++ rules below. */
13261 /* More Effective C++ rule 7. */
13268 /* More Effective C++ rule 6. */
13273 {
13282 {
13287 }
13288 else
13289 {
13292 }
13293 }
13295 /* Effective C++ rule 23. */
13306 }
13307 \f
13308 /* Return a string giving the keyword associate with CODE. */
13312 {
13314 {
13327 }
13328 }
13330 /* Name lookup in an elaborated-type-specifier (after the keyword
13331 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
13332 elaborated-type-specifier is invalid, issue a diagnostic and return
13333 error_mark_node; otherwise, return the *_TYPE to which it referred.
13334 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
13336 tree
13338 tree decl,
13340 {
13341 tree type;
13343 /* In the case of:
13345 struct S { struct S *p; };
13347 name lookup will find the TYPE_DECL for the implicit "S::S"
13348 typedef. Adjust for that here. */
13354 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
13355 is false for this case as well. */
13357 {
13361 }
13362 /* Accept template template parameters. */
13366 ;
13367 /* [dcl.type.elab]
13369 If the identifier resolves to a typedef-name or the
13370 simple-template-id resolves to an alias template
13371 specialization, the elaborated-type-specifier is ill-formed.
13373 In other words, the only legitimate declaration to use in the
13374 elaborated type specifier is the implicit typedef created when
13375 the type is declared. */
13379 {
13383 else
13388 }
13393 {
13397 }
13400 {
13404 }
13408 {
13409 /* If a class template appears as elaborated type specifier
13410 without a template header such as:
13412 template <class T> class C {};
13413 void f(class C); // No template header here
13415 then the required template argument is missing. */
13420 }
13423 }
13425 /* Lookup NAME in elaborate type specifier in scope according to
13426 SCOPE and issue diagnostics if necessary.
13427 Return *_TYPE node upon success, NULL_TREE when the NAME is not
13428 found, and ERROR_MARK_NODE for type error. */
13430 static tree
13433 {
13434 tree t;
13435 tree decl;
13437 {
13438 /* First try ordinary name lookup, ignoring hidden class name
13439 injected via friend declaration. */
13442 /* If that fails, the name will be placed in the smallest
13443 non-class, non-function-prototype scope according to 3.3.1/5.
13444 We may already have a hidden name declared as friend in this
13445 scope. So lookup again but not ignoring hidden names.
13446 If we find one, that name will be made visible rather than
13447 creating a new tag. */
13450 }
13451 else
13456 /* If scope is ts_current we're defining a class, so ignore a
13457 template template parameter. */
13463 {
13464 /* Look for invalid nested type:
13465 class C {
13466 class C {};
13467 }; */
13469 {
13472 decl);
13474 }
13476 /* Two cases we need to consider when deciding if a class
13477 template is allowed as an elaborated type specifier:
13478 1. It is a self reference to its own class.
13479 2. It comes with a template header.
13481 For example:
13483 template <class T> class C {
13484 class C *c1; // DECL_SELF_REFERENCE_P is true
13485 class D;
13486 };
13487 template <class U> class C; // template_header_p is true
13488 template <class T> class C<T>::D {
13489 class C *c2; // DECL_SELF_REFERENCE_P is true
13490 }; */
13493 decl,
13494 template_header_p
13499 {
13508 }
13511 }
13513 {
13517 }
13518 else
13520 }
13522 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
13523 Define the tag as a forward-reference if it is not defined.
13525 If a declaration is given, process it here, and report an error if
13526 multiple declarations are not identical.
13528 SCOPE is TS_CURRENT when this is also a definition. Only look in
13529 the current frame for the name (since C++ allows new names in any
13530 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
13531 declaration. Only look beginning from the current scope outward up
13532 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
13534 TEMPLATE_HEADER_P is true when this declaration is preceded by
13535 a set of template parameters. */
13537 static tree
13540 {
13547 {
13560 }
13562 /* In case of anonymous name, xref_tag is only called to
13563 make type node and push name. Name lookup is not required. */
13574 {
13578 /* Since SCOPE is not TS_CURRENT, we are not looking at a
13579 definition of this tag. Since, in addition, we are currently
13580 processing a (member) template declaration of a template
13581 class, we must be very careful; consider:
13583 template <class X> struct S1
13585 template <class U> struct S2
13586 {
13587 template <class V> friend struct S1;
13588 };
13590 Here, the S2::S1 declaration should not be confused with the
13591 outer declaration. In particular, the inner version should
13592 have a template parameter of level 2, not level 1.
13594 On the other hand, when presented with:
13596 template <class T> struct S1
13597 {
13598 template <class U> struct S2 {};
13599 template <class U> friend struct S2;
13600 };
13602 the friend must find S1::S2 eventually. We accomplish this
13603 by making sure that the new type we create to represent this
13604 declaration has the right TYPE_CONTEXT. */
13607 }
13610 {
13611 /* If no such tag is yet defined, create a forward-reference node
13612 and record it as the "definition".
13613 When a real declaration of this type is found,
13614 the forward-reference will be altered into a real type. */
13616 {
13619 }
13620 else
13621 {
13625 {
13626 /* Mark it as a lambda type. */
13628 /* And push it into current scope. */
13630 }
13632 }
13633 }
13634 else
13635 {
13637 {
13638 /* Check that we aren't trying to overload a class with different
13639 constraints. */
13642 {
13645 }
13648 }
13652 {
13656 }
13659 {
13660 /* This is no longer an invisible friend. Make it
13661 visible. */
13668 {
13672 }
13673 }
13674 }
13677 }
13679 /* Wrapper for xref_tag_1. */
13681 tree
13684 {
13685 tree ret;
13691 }
13694 tree
13696 {
13701 else
13708 }
13710 /* Create the binfo hierarchy for REF with (possibly NULL) base list
13711 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
13712 access_* node, and the TREE_VALUE is the type of the base-class.
13713 Non-NULL TREE_TYPE indicates virtual inheritance. */
13715 void
13717 {
13724 tree default_access;
13730 /* The base of a derived class is private by default, all others are
13731 public. */
13736 /* First, make sure that any templates in base-classes are
13737 instantiated. This ensures that if we call ourselves recursively
13738 we do not get confused about which classes are marked and which
13739 are not. */
13742 {
13745 /* The dependent_type_p call below should really be dependent_scope_p
13746 so that we give a hard error about using an incomplete type as a
13747 base, but we allow it with a pedwarn for backward
13748 compatibility. */
13754 /* An incomplete type. Remove it from the list. */
13756 else
13757 {
13758 max_bases++;
13760 max_dvbases++;
13764 }
13765 }
13770 /* The binfo slot should be empty, unless this is an (ill-formed)
13771 redefinition. */
13782 /* Apply base-class info set up to the variants of this type. */
13786 {
13788 /* A C++98 POD cannot have base classes. */
13793 }
13800 {
13801 /* An aggregate can't have virtual base classes. */
13809 }
13812 {
13820 /* Before C++17, an aggregate cannot have base classes. In C++17, an
13821 aggregate can't have virtual, private, or protected base classes. */
13832 {
13834 basetype);
13836 }
13840 {
13842 /* The original basetype could have been a typedef'd type. */
13845 /* Inherit flags from the base. */
13856 }
13858 /* We must do this test after we've seen through a typedef
13859 type. */
13861 {
13864 else
13867 }
13870 /* Regenerate the pack expansion for the bases. */
13884 dropped_base:
13885 /* Update max_vbases to reflect the reality that we are dropping
13886 this base: if it reaches zero we want to undo the vec_alloc
13887 above to avoid inconsistencies during error-recovery: eg, in
13888 build_special_member_call, CLASSTYPE_VBASECLASSES non null
13889 and vtt null (c++/27952). */
13891 max_vbases--;
13893 max_vbases
13895 }
13902 /* If we didn't get max_vbases vbases, we must have shared at
13903 least one of them, and are therefore diamond shaped. */
13906 /* Unmark all the types. */
13911 /* Now see if we have a repeated base type. */
13913 {
13916 {
13918 {
13921 }
13923 }
13928 else
13930 }
13931 }
13933 \f
13934 /* Copies the enum-related properties from type SRC to type DST.
13935 Used with the underlying type of an enum and the enum itself. */
13936 static void
13938 {
13939 tree t;
13941 {
13951 else
13955 }
13956 }
13958 /* Begin compiling the definition of an enumeration type.
13959 NAME is its name,
13961 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
13963 UNDERLYING_TYPE is the type that will be used as the storage for
13964 the enumeration type. This should be NULL_TREE if no storage type
13965 was specified.
13967 ATTRIBUTES are any attributes specified after the enum-key.
13969 SCOPED_ENUM_P is true if this is a scoped enumeration type.
13971 if IS_NEW is not NULL, gets TRUE iff a new type is created.
13973 Returns the type object, as yet incomplete.
13974 Also records info about it so that build_enumerator
13975 may be used to declare the individual values as they are read. */
13977 tree
13980 {
13986 /* [C++0x dcl.enum]p5:
13988 If not explicitly specified, the underlying type of a scoped
13989 enumeration type is int. */
13996 /* If this is the real definition for a previous forward reference,
13997 fill in the contents in the same object that used to be the
13998 forward reference. */
14004 /* In case of a template_decl, the only check that should be deferred
14005 to instantiation time is the comparison of underlying types. */
14007 {
14009 {
14015 }
14017 {
14023 }
14029 {
14035 }
14036 }
14040 {
14041 /* In case of error, make a dummy enum to allow parsing to
14042 continue. */
14044 {
14047 }
14049 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
14050 of an opaque enum, or an opaque enum of an already defined
14051 enumeration (C++0x only).
14052 In any other case, it'll be NULL_TREE. */
14054 {
14057 }
14060 /* Do not push the decl more than once, unless we need to
14061 compare underlying types at instantiation time */
14064 || (underlying_type
14068 {
14072 /* std::byte aliases anything. */
14077 }
14078 else
14085 /* The enum is considered opaque until the opening '{' of the
14086 enumerator list. */
14089 }
14096 {
14098 /* We already checked that it matches, don't change it to a different
14101 {
14104 }
14107 else
14110 }
14112 /* If into a template class, the returned enum is always the first
14113 declaration (opaque or not) seen. This way all the references to
14114 this type will be to the same declaration. The following ones are used
14115 only to check for definition errors. */
14118 else
14120 }
14122 /* After processing and defining all the values of an enumeration type,
14123 install their decls in the enumeration type.
14124 ENUMTYPE is the type object. */
14126 void
14128 {
14129 tree values;
14130 tree underlying_type;
14131 tree decl;
14132 tree value;
14134 tree t;
14136 bool fixed_underlying_type_p
14139 /* We built up the VALUES in reverse order. */
14142 /* For an enum defined in a template, just set the type of the values;
14143 all further processing is postponed until the template is
14144 instantiated. We need to set the type so that tsubst of a CONST_DECL
14145 works. */
14147 {
14149 values;
14153 }
14155 /* Determine the minimum and maximum values of the enumerators. */
14157 {
14161 values;
14163 {
14166 /* [dcl.enum]: Following the closing brace of an enum-specifier,
14167 each enumerator has the type of its enumeration. Prior to the
14168 closing brace, the type of each enumerator is the type of its
14169 initializing value. */
14172 /* Update the minimum and maximum values, if appropriate. */
14176 /* Figure out what the minimum and maximum values of the
14177 enumerators are. */
14184 }
14185 }
14186 else
14187 /* [dcl.enum]
14189 If the enumerator-list is empty, the underlying type is as if
14190 the enumeration had a single enumerator with value 0. */
14194 {
14195 /* Compute the number of bits require to represent all values of the
14196 enumeration. We must do this before the type of MINNODE and
14197 MAXNODE are transformed, since tree_int_cst_min_precision relies
14198 on the TREE_TYPE of the value it is passed. */
14206 /* Determine the underlying type of the enumeration.
14208 [dcl.enum]
14210 The underlying type of an enumeration is an integral type that
14211 can represent all the enumerator values defined in the
14212 enumeration. It is implementation-defined which integral type is
14213 used as the underlying type for an enumeration except that the
14214 underlying type shall not be larger than int unless the value of
14215 an enumerator cannot fit in an int or unsigned int.
14217 We use "int" or an "unsigned int" as the underlying type, even if
14218 a smaller integral type would work, unless the user has
14219 explicitly requested that we use the smallest possible type. The
14220 user can request that for all enumerations with a command line
14221 flag, or for just one enumeration with an attribute. */
14223 use_short_enum = flag_short_enums
14226 /* If the precision of the type was specified with an attribute and it
14227 was too small, give an error. Otherwise, use it. */
14229 {
14232 else
14233 {
14236 }
14237 }
14241 itk++)
14242 {
14248 }
14250 {
14251 /* DR 377
14253 IF no integral type can represent all the enumerator values, the
14254 enumeration is ill-formed. */
14259 }
14261 /* [dcl.enum]
14263 The value of sizeof() applied to an enumeration type, an object
14264 of an enumeration type, or an enumerator, is the value of sizeof()
14265 applied to the underlying type. */
14268 /* Compute the minimum and maximum values for the type.
14270 [dcl.enum]
14272 For an enumeration where emin is the smallest enumerator and emax
14273 is the largest, the values of the enumeration are the values of the
14274 underlying type in the range bmin to bmax, where bmin and bmax are,
14275 respectively, the smallest and largest values of the smallest bit-
14276 field that can store emin and emax. */
14278 /* The middle-end currently assumes that types with TYPE_PRECISION
14279 narrower than their underlying type are suitably zero or sign
14280 extended to fill their mode. Similarly, it assumes that the front
14281 end assures that a value of a particular type must be within
14282 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
14284 We used to set these fields based on bmin and bmax, but that led
14285 to invalid assumptions like optimizing away bounds checking. So
14286 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
14287 TYPE_MAX_VALUE to the values for the mode above and only restrict
14288 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
14292 set_min_and_max_values_for_integral_type
14295 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
14298 }
14299 else
14302 /* Convert each of the enumerators to the type of the underlying
14303 type of the enumeration. */
14305 {
14306 location_t saved_location;
14312 /* If the enumeration type has a fixed underlying type, we
14313 already checked all of the enumerator values. */
14315 else
14318 tf_warning_or_error);
14321 /* Do not clobber shared ints. */
14323 {
14327 }
14329 }
14331 /* Fix up all variant types of this enum type. */
14338 {
14340 /* TYPE_FIELDS needs fixup. */
14342 }
14344 /* Finish debugging output for this type. */
14347 /* Each enumerator now has the type of its enumeration. Clear the cache
14348 so that this change in types doesn't confuse us later on. */
14350 }
14352 /* Finishes the enum type. This is called only the first time an
14353 enumeration is seen, be it opaque or odinary.
14354 ENUMTYPE is the type object. */
14356 void
14358 {
14360 {
14364 }
14366 /* If this is a forward declaration, there should not be any variants,
14367 though we can get a variant in the middle of an enum-specifier with
14368 wacky code like 'enum E { e = sizeof(const E*) };' */
14372 }
14374 /* Build and install a CONST_DECL for an enumeration constant of the
14375 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
14376 Apply ATTRIBUTES if available. LOC is the location of NAME.
14377 Assignment of sequential values by default is handled here. */
14379 void
14381 location_t loc)
14382 {
14383 tree decl;
14384 tree context;
14385 tree type;
14387 /* scalar_constant_value will pull out this expression, so make sure
14388 it's folded as appropriate. */
14392 /* If the VALUE was erroneous, pretend it wasn't there; that will
14393 result in the enum being assigned the next value in sequence. */
14397 /* Remove no-op casts from the value. */
14402 {
14403 /* Validate and default VALUE. */
14405 {
14407 {
14412 }
14415 value = perform_implicit_conversion_flags
14423 {
14426 {
14430 }
14431 else
14432 {
14436 {
14440 }
14441 }
14442 }
14443 }
14445 /* Default based on previous value. */
14447 {
14449 {
14450 tree prev_value;
14453 /* C++03 7.2/4: If no initializer is specified for the first
14454 enumerator, the type is an unspecified integral
14455 type. Otherwise the type is the same as the type of the
14456 initializing value of the preceding enumerator unless the
14457 incremented value is not representable in that type, in
14458 which case the type is an unspecified integral type
14459 sufficient to contain the incremented value. */
14463 else
14464 {
14470 {
14473 {
14476 {
14482 }
14489 }
14492 else
14494 }
14497 {
14500 }
14501 }
14502 }
14503 else
14505 }
14507 /* Remove no-op casts from the value. */
14510 /* If the underlying type of the enum is fixed, check whether
14511 the enumerator values fits in the underlying type. If it
14512 does not fit, the program is ill-formed [C++0x dcl.enum]. */
14514 && value
14516 {
14521 /* Convert the value to the appropriate type. */
14523 }
14524 }
14526 /* C++ associates enums with global, function, or class declarations. */
14529 /* Build the actual enumeration constant. Note that the enumeration
14530 constants have the underlying type of the enum (if it is fixed)
14531 or the type of their initializer (if the underlying type of the
14532 enum is not fixed):
14534 [ C++0x dcl.enum ]
14536 If the underlying type is fixed, the type of each enumerator
14537 prior to the closing brace is the underlying type; if the
14538 initializing value of an enumerator cannot be represented by
14539 the underlying type, the program is ill-formed. If the
14540 underlying type is not fixed, the type of each enumerator is
14541 the type of its initializing value.
14543 If the underlying type is not fixed, it will be computed by
14544 finish_enum and we will reset the type of this enumerator. Of
14545 course, if we're processing a template, there may be no value. */
14559 {
14560 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
14561 on the TYPE_FIELDS list for `S'. (That's so that you can say
14562 things like `S::i' later.) */
14564 /* The enumerator may be getting declared outside of its enclosing
14565 class, like so:
14567 class S { public: enum E : int; }; enum S::E : int { i = 7; };
14569 For which case we need to make sure that the access of `S::i'
14570 matches the access of `S::E'. */
14576 else
14582 }
14583 else
14586 /* Add this enumeration constant to the list for this type. */
14588 }
14590 /* Look for an enumerator with the given NAME within the enumeration
14591 type ENUMTYPE. This routine is used primarily for qualified name
14592 lookup into an enumerator in C++0x, e.g.,
14594 enum class Color { Red, Green, Blue };
14596 Color color = Color::Red;
14598 Returns the value corresponding to the enumerator, or
14599 NULL_TREE if no such enumerator was found. */
14600 tree
14602 {
14603 tree e;
14608 }
14610 \f
14611 /* We're defining DECL. Make sure that its type is OK. */
14613 static void
14615 {
14619 /* In a function definition, arg types must be complete. */
14626 {
14631 /* Make it return void instead. */
14634 void_type_node,
14636 else
14638 fntype
14641 fntype = (cp_build_type_attribute_variant
14644 }
14645 else
14646 {
14650 }
14651 }
14653 /* True iff FN is an implicitly-defined default constructor. */
14655 static bool
14657 {
14661 }
14663 /* Clobber the contents of *this to let the back end know that the object
14664 storage is dead when we enter the constructor or leave the destructor. */
14666 static tree
14668 {
14669 /* Clobbering an empty base is pointless, and harmful if its one byte
14670 TYPE_SIZE overlays real data. */
14674 /* If we have virtual bases, clobber the whole object, but only if we're in
14675 charge. If we don't have virtual bases, clobber the as-base type so we
14676 don't mess with tail padding. */
14688 {
14691 }
14698 }
14700 /* Create the FUNCTION_DECL for a function definition.
14701 DECLSPECS and DECLARATOR are the parts of the declaration;
14702 they describe the function's name and the type it returns,
14703 but twisted together in a fashion that parallels the syntax of C.
14705 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
14706 DECLARATOR is really the DECL for the function we are about to
14707 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
14708 indicating that the function is an inline defined in-class.
14710 This function creates a binding context for the function body
14711 as well as setting up the FUNCTION_DECL in current_function_decl.
14713 For C++, we must first check whether that datum makes any sense.
14714 For example, "class A local_a(1,2);" means that variable local_a
14715 is an aggregate of type A, which should have a constructor
14716 applied to it with the argument list [1, 2].
14718 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
14719 or may be a BLOCK if the function has been defined previously
14720 in this translation unit. On exit, DECL_INITIAL (decl1) will be
14721 error_mark_node if the function has never been defined, or
14722 a BLOCK if the function has been defined somewhere. */
14724 bool
14726 {
14728 tree fntype;
14729 tree restype;
14732 tree current_function_parms;
14737 /* Sanity check. */
14745 /* ISO C++ 11.4/5. A friend function defined in a class is in
14746 the (lexical) scope of the class in which it is defined. */
14748 {
14751 /* CTYPE could be null here if we're dealing with a template;
14752 for example, `inline friend float foo()' inside a template
14753 will have no CTYPE set. */
14756 else
14758 }
14765 /* Handle gnu_inline attribute. */
14767 {
14772 }
14775 /* This is a constructor, we must ensure that any default args
14776 introduced by this definition are propagated to the clones
14777 now. The clones are used directly in overload resolution. */
14780 /* Sometimes we don't notice that a function is a static member, and
14781 build a METHOD_TYPE for it. Fix that up now. */
14785 /* Set up current_class_type, and enter the scope of the class, if
14786 appropriate. */
14792 /* Now that we have entered the scope of the class, we must restore
14793 the bindings for any template parameters surrounding DECL1, if it
14794 is an inline member template. (Order is important; consider the
14795 case where a template parameter has the same name as a field of
14796 the class.) It is not until after this point that
14797 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
14801 /* Effective C++ rule 15. */
14809 /* Make the init_value nonzero so pushdecl knows this is not tentative.
14810 error_mark_node is replaced below (in poplevel) with the BLOCK. */
14814 /* This function exists in static storage.
14815 (This does not mean `static' in the C sense!) */
14818 /* We must call push_template_decl after current_class_type is set
14819 up. (If we are processing inline definitions after exiting a
14820 class scope, current_class_type will be NULL_TREE until set above
14821 by push_nested_class.) */
14823 {
14826 {
14830 }
14832 }
14834 /* Make sure the parameter and return types are reasonable. When
14835 you declare a function, these types can be incomplete, but they
14836 must be complete when you define the function. */
14839 /* Build the return declaration for the function. */
14843 {
14844 tree resdecl;
14852 }
14854 /* Record the decl so that the function name is defined.
14855 If we already have a decl for this name, and it is a FUNCTION_DECL,
14856 use the old decl. */
14858 {
14859 /* A specialization is not used to guide overload resolution. */
14863 {
14867 /* If something went wrong when registering the declaration,
14868 use DECL1; we have to have a FUNCTION_DECL to use when
14869 parsing the body of the function. */
14870 ;
14871 else
14872 {
14873 /* Otherwise, OLDDECL is either a previous declaration
14874 of the same function or DECL1 itself. */
14881 {
14882 tree context;
14884 /* Check whether DECL1 is in an anonymous
14885 namespace. */
14887 context;
14889 {
14893 }
14897 OPT_Wmissing_declarations,
14899 }
14902 }
14903 }
14904 else
14905 {
14906 /* We need to set the DECL_CONTEXT. */
14909 }
14913 /* If #pragma weak applies, mark the decl appropriately now.
14914 The pragma only applies to global functions. Because
14915 determining whether or not the #pragma applies involves
14916 computing the mangled name for the declaration, we cannot
14917 apply the pragma until after we have merged this declaration
14918 with any previous declarations; if the original declaration
14919 has a linkage specification, that specification applies to
14920 the definition as well, and may affect the mangled name. */
14923 }
14925 /* We are now in the scope of the function being defined. */
14928 /* Save the parm names or decls from this function's declarator
14929 where store_parm_decls will find them. */
14932 /* Let the user know we're compiling this function. */
14937 /* This function may already have been parsed, in which case just
14938 return; our caller will skip over the body without parsing. */
14942 /* Initialize RTL machinery. We cannot do this until
14943 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
14944 even when processing a template; this is how we get
14945 CFUN set up, and our per-function variables initialized.
14946 FIXME factor out the non-RTL stuff. */
14950 /* Initialize the language data structures. Whenever we start
14951 a new function, we destroy temporaries in the usual way. */
14957 {
14960 }
14962 /* Start the statement-tree, start the tree now. */
14965 /* If we are (erroneously) defining a function that we have already
14966 defined before, wipe out what we knew before. */
14971 {
14972 /* We know that this was set up by `grokclassfn'. We do not
14973 wait until `store_parm_decls', since evil parse errors may
14974 never get us to that point. Here we keep the consistency
14975 between `current_class_type' and `current_class_ptr'. */
14981 cp_function_chain->x_current_class_ref
14983 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
14986 /* Constructors and destructors need to know whether they're "in
14987 charge" of initializing virtual base classes. */
14990 {
14993 }
14995 {
14998 }
14999 }
15002 /* Implicitly-defined methods (like the
15003 destructor for a class in which no destructor
15004 is explicitly declared) must not be defined
15005 until their definition is needed. So, we
15006 ignore interface specifications for
15007 compiler-generated functions. */
15013 {
15020 /* This is a function in a local class in an extern inline
15021 or template function. */
15023 }
15024 /* If this function belongs to an interface, it is public.
15025 If it belongs to someone else's interface, it is also external.
15026 This only affects inlines and template instantiations. */
15028 {
15031 {
15035 && ! flag_implement_inlines
15038 /* For WIN32 we also want to put these in linkonce sections. */
15040 }
15041 else
15044 /* If this function is in an interface implemented in this file,
15045 make sure that the back end knows to emit this function
15046 here. */
15049 }
15052 {
15053 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
15054 interface, we will have both finfo->interface_unknown and
15055 finfo->interface_only set. In that case, we don't want to
15056 use the normal heuristics because someone will supply a
15057 #pragma implementation elsewhere, and deducing it here would
15058 produce a conflict. */
15063 }
15064 else
15065 {
15066 /* This is a definition, not a reference.
15067 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
15075 else
15077 }
15079 /* Determine the ELF visibility attribute for the function. We must not
15080 do this before calling "pushdecl", as we must allow "duplicate_decls"
15081 to merge any attributes appropriately. We also need to wait until
15082 linkage is set. */
15096 {
15099 }
15109 /* Clobbering an empty base is harmful if it overlays real data. */
15111 /* We can't clobber safely for an implicitly-defined default constructor
15112 because part of the initialization might happen before we enter the
15113 constructor, via AGGR_INIT_ZERO_FIRST (c++/68006). */
15127 }
15130 /* Like start_preparsed_function, except that instead of a
15131 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
15133 Returns true on success. If the DECLARATOR is not suitable
15134 for a function, we return false, which tells the parser to
15135 skip the entire function. */
15137 bool
15140 tree attrs)
15141 {
15142 tree decl1;
15148 /* If the declarator is not suitable for a function definition,
15149 cause a syntax error. */
15151 {
15154 }
15157 /* main must return int. grokfndecl should have corrected it
15158 (and issued a diagnostic) if the user got it wrong. */
15160 integer_type_node));
15163 }
15164 \f
15165 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
15166 FN. */
15168 static bool
15170 {
15172 && !processing_template_decl
15174 /* We insert the EH_SPEC_BLOCK only in the original
15175 function; then, it is copied automatically to the
15176 clones. */
15178 /* Implicitly-generated constructors and destructors have
15179 exception specifications. However, those specifications
15180 are the union of the possible exceptions specified by the
15181 constructors/destructors for bases and members, so no
15182 unallowed exception will ever reach this function. By
15183 not creating the EH_SPEC_BLOCK we save a little memory,
15184 and we avoid spurious warnings about unreachable
15185 code. */
15187 }
15189 /* Store the parameter declarations into the current function declaration.
15190 This is called after parsing the parameter declarations, before
15191 digesting the body of the function.
15193 Also install to binding contour return value identifier, if any. */
15195 static void
15197 {
15199 tree parm;
15201 /* This is a chain of any other decls that came in among the parm
15202 declarations. If a parm is declared with enum {foo, bar} x;
15203 then CONST_DECLs for foo and bar are put here. */
15207 {
15208 /* This case is when the function was defined with an ANSI prototype.
15209 The parms already have decls, so we need not do anything here
15210 except record them as in effect
15211 and complain if any redundant old-style parm decls were written. */
15214 tree next;
15216 /* Must clear this because it might contain TYPE_DECLs declared
15217 at class level. */
15220 /* If we're doing semantic analysis, then we'll call pushdecl
15221 for each of these. We must do them in reverse order so that
15222 they end in the correct forward order. */
15226 {
15230 else
15231 {
15232 /* If we find an enum constant or a type tag,
15233 put it aside for the moment. */
15236 }
15237 }
15239 /* Get the decls in their original chain order and record in the
15240 function. This is all and only the PARM_DECLs that were
15241 pushed into scope by the loop above. */
15243 }
15244 else
15247 /* Now store the final chain of decls for the arguments
15248 as the decl-chain of the current lexical scope.
15249 Put the enumerators in as well, at the front so that
15250 DECL_ARGUMENTS is not modified. */
15255 }
15257 \f
15258 /* We have finished doing semantic analysis on DECL, but have not yet
15259 generated RTL for its body. Save away our current state, so that
15260 when we want to generate RTL later we know what to do. */
15262 static void
15264 {
15267 /* Save the language-specific per-function data so that we can
15268 get it back when we really expand this function. */
15271 /* Make a copy. */
15276 /* Clear out the bits we don't need. */
15281 }
15284 /* Set the return value of the constructor (if present). */
15286 static void
15288 {
15289 tree val;
15290 tree exprstmt;
15293 {
15294 /* Any return from a constructor will end up here. */
15300 /* Return the address of the object. */
15303 }
15304 }
15306 /* Do all the processing for the beginning of a destructor; set up the
15307 vtable pointers and cleanups for bases and members. */
15309 static void
15311 {
15312 tree compound_stmt;
15314 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
15315 issued an error message. We still want to try to process the
15316 body of the function, but initialize_vtbl_ptrs will crash if
15317 TYPE_BINFO is NULL. */
15319 {
15321 /* Make all virtual function table pointers in non-virtual base
15322 classes point to CURRENT_CLASS_TYPE's virtual function
15323 tables. */
15328 /* Clobbering an empty base is harmful if it overlays real data. */
15330 {
15334 {
15336 tree ref
15343 tf_warning_or_error);
15345 }
15346 else
15348 }
15350 /* And insert cleanups for our bases and members so that they
15351 will be properly destroyed if we throw. */
15353 }
15354 }
15356 /* At the end of every destructor we generate code to delete the object if
15357 necessary. Do that now. */
15359 static void
15361 {
15362 tree exprstmt;
15364 /* Any return from a destructor will end up here; that way all base
15365 and member cleanups will be run when the function returns. */
15369 {
15370 tree val;
15375 /* Return the address of the object. */
15378 }
15379 }
15381 /* Do the necessary processing for the beginning of a function body, which
15382 in this case includes member-initializers, but not the catch clauses of
15383 a function-try-block. Currently, this means opening a binding level
15384 for the member-initializers (in a ctor), member cleanups (in a dtor),
15385 and capture proxies (in a lambda operator()). */
15387 tree
15389 {
15390 tree stmt;
15397 else
15398 /* Always keep the BLOCK node associated with the outermost pair of
15399 curly braces of a function. These are needed for correct
15400 operation of dwarfout.c. */
15411 }
15413 /* Do the processing for the end of a function body. Currently, this means
15414 closing out the cleanups for fully-constructed bases and members, and in
15415 the case of the destructor, deleting the object if desired. Again, this
15416 is only meaningful for [cd]tors, since they are the only functions where
15417 there is a significant distinction between the main body and any
15418 function catch clauses. Handling, say, main() return semantics here
15419 would be wrong, as flowing off the end of a function catch clause for
15420 main() would also need to return 0. */
15422 void
15424 {
15428 /* Close the block. */
15437 }
15439 /* Given a function, returns the BLOCK corresponding to the outermost level
15440 of curly braces, skipping the artificial block created for constructor
15441 initializers. */
15443 tree
15445 {
15455 }
15457 /* If FNDECL is a class's key method, add the class to the list of
15458 keyed classes that should be emitted. */
15460 static void
15462 {
15466 {
15470 }
15471 }
15473 /* Subroutine of finish_function.
15474 Save the body of constexpr functions for possible
15475 future compile time evaluation. */
15477 static void
15479 {
15485 }
15487 /* Finish up a function declaration and compile that function
15488 all the way to assembler language output. The free the storage
15489 for the function definition. INLINE_P is TRUE if we just
15490 finished processing the body of an in-class inline function
15491 definition. (This processing will have taken place after the
15492 class definition is complete.) */
15494 tree
15496 {
15500 /* When we get some parse errors, we can end up without a
15501 current_function_decl, so cope. */
15514 /* TREE_READONLY (fndecl) = 1;
15515 This caused &foo to be of type ptr-to-const-function
15516 which then got a warning when stored in a ptr-to-function variable. */
15519 /* The current function is being defined, so its DECL_INITIAL should
15520 be set, and unless there's a multiple definition, it should be
15521 error_mark_node. */
15524 /* For a cloned function, we've already got all the code we need;
15525 there's no need to add any extra bits. */
15527 {
15528 /* Make it so that `main' always returns 0 by default. */
15535 current_eh_spec_block);
15536 }
15538 /* If we're saving up tree structure, tie off the function now. */
15543 /* If this function can't throw any exceptions, remember that. */
15546 && !flag_non_call_exceptions
15550 /* This must come after expand_function_end because cleanups might
15551 have declarations (from inline functions) that need to go into
15552 this function's blocks. */
15554 /* If the current binding level isn't the outermost binding level
15555 for this function, either there is a bug, or we have experienced
15556 syntax errors and the statement tree is malformed. */
15558 {
15559 /* Make sure we have already experienced errors. */
15562 /* Throw away the broken statement tree and extra binding
15563 levels. */
15567 {
15570 else
15572 }
15573 }
15576 /* Statements should always be full-expressions at the outermost set
15577 of curly braces for a function. */
15580 /* If there are no return statements in a function with auto return type,
15581 the return type is void. But if the declared type is something like
15582 auto*, this is an error. */
15585 {
15587 {
15590 }
15593 {
15595 current_function_auto_return_pattern);
15598 }
15599 }
15601 // If this is a concept, check that the definition is reasonable.
15605 /* Lambda closure members are implicitly constexpr if possible. */
15609 = ((processing_template_decl
15613 /* Save constexpr function body before it gets munged by
15614 the NRV transformation. */
15617 /* Invoke the pre-genericize plugin before we start munging things. */
15621 /* Perform delayed folding before NRV transformation. */
15625 /* Set up the named return value optimization, if we can. Candidate
15626 variables are selected in check_return_expr. */
15628 {
15630 tree outer;
15633 /* This is only worth doing for fns that return in memory--and
15634 simpler, since we don't have to worry about promoted modes. */
15636 /* Only allow this for variables declared in the outer scope of
15637 the function so we know that their lifetime always ends with a
15638 return; see g++.dg/opt/nrv6.C. We could be more flexible if
15639 we were to do this optimization in tree-ssa. */
15645 }
15647 /* Remember that we were in class scope. */
15651 /* Must mark the RESULT_DECL as being in this function. */
15654 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
15655 to the FUNCTION_DECL node itself. */
15658 /* Save away current state, if appropriate. */
15662 /* Complain if there's just no return statement. */
15667 /* Don't complain if we abort or throw. */
15668 && !current_function_returns_abnormally
15669 /* Don't complain if there's an infinite loop. */
15670 && !current_function_infinite_loop
15671 /* Don't complain if we are declared noreturn. */
15675 /* Structor return values (if any) are set by the compiler. */
15679 {
15683 }
15685 /* Store the end of the function, so that we get good line number
15686 info for the epilogue. */
15689 /* Complain about parameters that are only set, but never otherwise used. */
15691 && !processing_template_decl
15694 {
15695 tree decl;
15698 decl;
15712 OPT_Wunused_but_set_parameter,
15715 }
15717 /* Complain about locally defined typedefs that are not used in this
15718 function. */
15721 /* Possibly warn about unused parameters. */
15723 && !processing_template_decl
15727 /* Genericize before inlining. */
15729 {
15732 /* Clear out the bits we don't need. */
15742 }
15743 /* Clear out the bits we don't need. */
15746 /* We're leaving the context of this function, so zap cfun. It's still in
15747 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
15751 /* If this is an in-class inline definition, we may have to pop the
15752 bindings for the template parameters that we added in
15753 maybe_begin_member_template_processing when start_function was
15754 called. */
15758 /* Leave the scope of the class. */
15764 /* Clean up. */
15769 }
15770 \f
15771 /* Create the FUNCTION_DECL for a function definition.
15772 DECLSPECS and DECLARATOR are the parts of the declaration;
15773 they describe the return type and the name of the function,
15774 but twisted together in a fashion that parallels the syntax of C.
15776 This function creates a binding context for the function body
15777 as well as setting up the FUNCTION_DECL in current_function_decl.
15779 Returns a FUNCTION_DECL on success.
15781 If the DECLARATOR is not suitable for a function (it defines a datum
15782 instead), we return 0, which tells yyparse to report a parse error.
15784 May return void_type_node indicating that this method is actually
15785 a friend. See grokfield for more details.
15787 Came here with a `.pushlevel' .
15789 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
15790 CHANGES TO CODE IN `grokfield'. */
15792 tree
15795 {
15803 {
15806 }
15811 /* Pass friends other than inline friend functions back. */
15816 {
15821 }
15830 /* We process method specializations in finish_struct_1. */
15832 {
15836 }
15839 {
15841 {
15844 }
15845 }
15851 }
15852 \f
15854 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
15855 we can lay it out later, when and if its type becomes complete.
15857 Also handle constexpr variables where the initializer involves
15858 an unlowered PTRMEM_CST because the class isn't complete yet. */
15860 void
15862 {
15865 /* Keep track of variables with incomplete types. */
15868 {
15876 /* RTTI TD entries are created while defining the type_info. */
15879 {
15882 }
15886 {
15887 /* When the outermost open class is complete we can resolve any
15888 pointers-to-members. */
15892 }
15893 }
15894 }
15896 /* Called when a class type (given by TYPE) is defined. If there are
15897 any existing VAR_DECLs whose type has been completed by this
15898 declaration, update them now. */
15900 void
15902 {
15907 {
15909 {
15916 {
15917 /* Complete the type of the variable. The VAR_DECL itself
15918 will be laid out in expand_expr. */
15921 }
15923 /* Remove this entry from the list. */
15925 }
15926 else
15927 ix++;
15928 }
15930 /* Check for pending declarations which may have abstract type. */
15932 }
15934 /* If DECL is of a type which needs a cleanup, build and return an
15935 expression to perform that cleanup here. Return NULL_TREE if no
15936 cleanup need be done. DECL can also be a _REF when called from
15937 split_nonconstant_init_1. */
15939 tree
15941 {
15942 tree type;
15943 tree attr;
15944 tree cleanup;
15946 /* Assume no cleanup is required. */
15952 /* Handle "__attribute__((cleanup))". We run the cleanup function
15953 before the destructor since the destructor is what actually
15954 terminates the lifetime of the object. */
15957 else
15960 {
15961 tree id;
15962 tree fn;
15963 tree arg;
15965 /* Get the name specified by the user for the cleanup function. */
15967 /* Look up the name to find the cleanup function to call. It is
15968 important to use lookup_name here because that is what is
15969 used in c-common.c:handle_cleanup_attribute when performing
15970 initial checks on the attribute. Note that those checks
15971 include ensuring that the function found is not an overloaded
15972 function, or an object with an overloaded call operator,
15973 etc.; we can rely on the fact that the function found is an
15974 ordinary FUNCTION_DECL. */
15982 }
15983 /* Handle ordinary C++ destructors. */
15986 {
15988 tree addr;
15989 tree call;
15993 else
16004 else
16006 }
16008 /* build_delete sets the location of the destructor call to the
16009 current location, even though the destructor is going to be
16010 called later, at the end of the current scope. This can lead to
16011 a "jumpy" behavior for users of debuggers when they step around
16012 the end of the block. So let's unset the location of the
16013 destructor call instead. */
16019 /* Treat objects with destructors as used; the destructor may do
16020 something substantive. */
16025 }
16027 \f
16028 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
16029 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
16030 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
16032 tree
16034 {
16035 tree fntype;
16036 tree args;
16050 fntype = (cp_build_type_attribute_variant
16052 fntype = (build_exception_variant
16057 }
16059 /* DECL was originally constructed as a non-static member function,
16060 but turned out to be static. Update it accordingly. */
16062 void
16064 {
16077 }
16079 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
16080 one of the language-independent trees. */
16082 enum cp_tree_node_structure_enum
16084 {
16086 {
16103 }
16104 }
16106 /* Build the void_list_node (void_type_node having been created). */
16107 tree
16109 {
16112 }
16114 bool
16116 {
16117 /* A missing noreturn is ok for the `main' function. */
16119 }
16121 /* Return the decl used to identify the COMDAT group into which DECL should
16122 be placed. */
16124 tree
16126 {
16127 /* Virtual tables, construction virtual tables, and virtual table
16128 tables all go in a single COMDAT group, named after the primary
16129 virtual table. */
16132 /* For all other DECLs, the COMDAT group is the mangled name of the
16133 declaration itself. */
16134 else
16135 {
16137 {
16138 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
16139 into the same section as the target function. In that case
16140 we must return target's name. */
16146 else
16148 }
16149 }
16152 }
16154 /* Returns the return type for FN as written by the user, which may include
16155 a placeholder for a deduced return type. */
16157 tree
16159 {
16162 {
16169 }
16171 }
16173 /* Returns true iff DECL was declared with an auto type and it has
16174 not yet been deduced to a real type. */
16176 bool
16178 {
16182 }
16184 /* Complain if DECL has an undeduced return type. */
16186 bool
16188 {
16190 {
16194 }
16196 }