| blob | 148afa6c9ace158ae5ded668460c9c9520c8c26b |
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 {
3549 {
3552 value = (perform_implicit_conversion_flags
3555 }
3557 }
3559 /* Note that we've seen a definition of a case label, and complain if this
3560 is a bad place for one. */
3562 tree
3564 {
3567 tree type;
3573 {
3574 tree label;
3576 /* For templates, just add the case label; we'll do semantic
3577 analysis at instantiation-time. */
3580 }
3582 /* Find the condition on which this switch statement depends. */
3599 /* After labels, make any new cleanups in the function go into their
3600 own new (temporary) binding contour. */
3607 }
3608 \f
3610 tree scope;
3611 tree name;
3612 tree template_id;
3615 };
3618 {
3621 /* Hash a TYPENAME_TYPE. */
3623 static hashval_t
3625 {
3626 hashval_t hash;
3632 }
3634 /* Compare two TYPENAME_TYPEs. */
3636 static bool
3638 {
3644 }
3645 };
3647 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3648 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3650 Returns the new TYPENAME_TYPE. */
3654 tree
3657 {
3658 tree t;
3659 tree d;
3660 typename_info ti;
3662 hashval_t hash;
3677 /* See if we already have this type. */
3681 else
3682 {
3683 /* Build the TYPENAME_TYPE. */
3690 /* Build the corresponding TYPE_DECL. */
3697 /* Store it in the hash table. */
3700 /* TYPENAME_TYPEs must always be compared structurally, because
3701 they may or may not resolve down to another type depending on
3702 the currently open classes. */
3704 }
3707 }
3709 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3710 provided to name the type. Returns an appropriate type, unless an
3711 error occurs, in which case error_mark_node is returned. If we
3712 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3713 return that, rather than the _TYPE it corresponds to, in other
3714 cases we look through the type decl. If TF_ERROR is set, complain
3715 about errors, otherwise be quiet. */
3717 tree
3719 tsubst_flags_t complain)
3720 {
3721 tree fullname;
3722 tree t;
3731 {
3736 else
3737 /* Create a TEMPLATE_ID_EXPR for the type. */
3741 }
3748 {
3753 {
3757 }
3758 }
3760 {
3764 }
3769 {
3773 }
3775 /* When the CONTEXT is a dependent type, NAME could refer to a
3776 dependent base class of CONTEXT. But look inside it anyway
3777 if CONTEXT is a currently open scope, in case it refers to a
3778 member of the current instantiation or a non-dependent base;
3779 lookup will stop when we hit a dependent base. */
3781 /* We should only set WANT_TYPE when we're a nested typename type.
3782 Then we can give better diagnostics if we find a non-type. */
3784 else
3793 {
3795 {
3798 else
3801 }
3803 }
3805 /* Pull out the template from an injected-class-name (or multiple). */
3810 {
3812 {
3815 }
3817 }
3820 {
3825 }
3827 {
3832 }
3837 /* If we are currently parsing a template and if T is a typedef accessed
3838 through CONTEXT then we need to remember and check access of T at
3839 template instantiation time. */
3854 }
3856 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3857 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3858 in which case error_mark_node is returned.
3860 If PARM_LIST is non-NULL, also make sure that the template parameter
3861 list of TEMPLATE_DECL matches.
3863 If COMPLAIN zero, don't complain about any errors that occur. */
3865 tree
3867 tsubst_flags_t complain)
3868 {
3869 tree t;
3870 tree d;
3880 {
3890 {
3894 }
3898 {
3900 {
3904 }
3906 }
3909 complain))
3913 }
3915 /* Build the UNBOUND_CLASS_TEMPLATE. */
3921 /* Build the corresponding TEMPLATE_DECL. */
3930 }
3932 \f
3934 /* Push the declarations of builtin types into the global namespace.
3935 RID_INDEX is the index of the builtin type in the array
3936 RID_POINTERS. NAME is the name used when looking up the builtin
3937 type. TYPE is the _TYPE node for the builtin type.
3939 The calls to set_global_binding below should be
3940 eliminated. Built-in types should not be looked up name; their
3941 names are keywords that the parser can recognize. However, there
3942 is code in c-common.c that uses identifier_global_value to look up
3943 built-in types by name. */
3945 void
3948 tree type)
3949 {
3953 {
3959 }
3964 {
3970 }
3973 {
3977 }
3978 }
3980 /* Push a type into the namespace so that the back ends ignore it. */
3982 static void
3984 {
3987 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3994 }
3996 /* Create all the predefined identifiers. */
3998 static void
4000 {
4001 struct predefined_identifier
4002 {
4006 };
4008 /* A table of identifiers to create at startup. */
4012 /* Some of these names have a trailing space so that it is
4013 impossible for them to conflict with names written by users. */
4030 /* The demangler expects anonymous namespaces to be called
4031 something starting with '_GLOBAL__N_'. It no longer needs
4032 to be unique to the TU. */
4038 };
4042 {
4044 /* Some of these identifiers already have a special kind. */
4047 }
4048 }
4050 /* Create the predefined scalar types of C,
4051 and some nodes representing standard constants (0, 1, (void *)0).
4052 Initialize the global binding level.
4053 Make definitions for built-in primitive functions. */
4055 void
4057 {
4058 tree void_ftype;
4059 tree void_ftype_ptr;
4061 /* Create all the identifiers we need. */
4064 /* Create the global variables. */
4069 /* Enter the global namespace. */
4072 void_type_node);
4076 /* Remember whether we want the empty class passing ABI change warning
4077 in this TU. */
4080 debug_hooks->register_main_translation_unit
4088 /* Initially, C. */
4091 /* Create the `std' namespace. */
4102 /* Guess at the initial static decls size. */
4105 /* ... and keyed classes. */
4117 NULL_TREE);
4119 #if 0
4121 #endif
4130 void_ftype_ptr
4133 /* Create the conversion operator marker. This operator's DECL_NAME
4134 is in the identifier table, so we can use identifier equality to
4135 find it. */
4137 void_ftype);
4139 /* C++ extensions */
4144 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
4147 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
4148 result. */
4155 {
4156 /* Make sure we get a unique function type, so we can give
4157 its pointer type a name. (This wins for gdb.) */
4164 }
4167 vtbl_type_node
4186 /* Now, C++. */
4191 {
4194 }
4200 {
4203 tree ptr_ftype_sizetype;
4204 tree new_eh_spec;
4206 ptr_ftype_sizetype
4209 {
4210 tree bad_alloc_id;
4211 tree bad_alloc_type_node;
4212 tree bad_alloc_decl;
4218 bad_alloc_decl
4223 new_eh_spec
4225 }
4226 else
4229 /* Ensure attribs.c is initialized. */
4232 /* Ensure constraint.cc is initialized. */
4236 NULL_TREE);
4239 extvisattr);
4253 {
4254 /* Also push the sized deallocation variants:
4255 void operator delete(void*, std::size_t) throw();
4256 void operator delete[](void*, std::size_t) throw(); */
4257 tree void_ftype_ptr_size
4261 extvisattr);
4265 }
4268 {
4275 /* operator new (size_t, align_val_t); */
4287 /* operator delete (void *, align_val_t); */
4296 {
4297 /* operator delete (void *, size_t, align_val_t); */
4300 NULL_TREE);
4305 }
4306 }
4318 }
4320 abort_fndecl
4324 /* Perform other language dependent initializations. */
4338 /* Show we use EH for cleanups. */
4341 }
4343 /* Generate an initializer for a function naming variable from
4344 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
4345 filled in with the type of the init. */
4347 tree
4349 {
4351 tree type;
4356 {
4360 }
4369 else
4373 }
4375 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
4376 the decl, LOC is the location to give the decl, NAME is the
4377 initialization string and TYPE_DEP indicates whether NAME depended
4378 on the type of the function. We make use of that to detect
4379 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
4380 at the point of first use, so we mustn't push the decl now. */
4382 static tree
4384 {
4387 tree type;
4401 {
4405 LOOKUP_ONLYCONVERTING);
4406 }
4407 else
4408 {
4411 }
4414 }
4416 static tree
4418 {
4426 /* Runtime library routines are, by definition, available in an
4427 external shared object. */
4433 /* A function in the user's namespace should have an explicit
4434 declaration before it is used. Mark the built-in function as
4435 anticipated but not actually declared. */
4439 {
4442 /* Treat __*_chk fortification functions as anticipated as well,
4443 unless they are __builtin_*. */
4448 }
4452 else
4456 }
4458 tree
4460 {
4463 /* All builtins that don't begin with an '_' should additionally
4464 go in the 'std' namespace. */
4466 {
4471 }
4474 }
4476 /* Like cxx_builtin_function, but guarantee the function is added to the global
4477 scope. This is to allow function specific options to add new machine
4478 dependent builtins when the target ISA changes via attribute((target(...)))
4479 which saves space on program startup if the program does not use non-generic
4480 ISAs. */
4482 tree
4484 {
4488 /* All builtins that don't begin with an '_' should additionally
4489 go in the 'std' namespace. */
4491 {
4496 }
4499 }
4501 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
4502 function. Not called directly. */
4504 static tree
4507 {
4515 /* Runtime library routines are, by definition, available in an
4516 external shared object. */
4521 }
4523 /* Returns the _DECL for a library function with C++ linkage. */
4525 static tree
4528 {
4533 }
4535 /* Like build_library_fn, but takes a C string instead of an
4536 IDENTIFIER_NODE. */
4538 tree
4540 {
4542 }
4544 /* Like build_cp_library_fn, but takes a C string instead of an
4545 IDENTIFIER_NODE. */
4547 tree
4549 {
4551 ecf_flags);
4552 }
4554 /* Like build_library_fn, but also pushes the function so that we will
4555 be able to find it via get_global_binding. Also, the function
4556 may throw exceptions listed in RAISES. */
4558 tree
4560 {
4561 tree fn;
4569 }
4571 /* Like build_cp_library_fn, but also pushes the function so that it
4572 will be found by normal lookup. */
4574 static tree
4577 {
4584 }
4586 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
4587 a FUNCTION_TYPE. */
4589 tree
4591 {
4594 }
4596 /* Like push_library_fn, but also note that this function throws
4597 and does not return. Used for __throw_foo and the like. */
4599 tree
4601 {
4604 }
4605 \f
4606 /* When we call finish_struct for an anonymous union, we create
4607 default copy constructors and such. But, an anonymous union
4608 shouldn't have such things; this function undoes the damage to the
4609 anonymous union type T.
4611 (The reason that we create the synthesized methods is that we don't
4612 distinguish `union { int i; }' from `typedef union { int i; } U'.
4613 The first is an anonymous union; the second is just an ordinary
4614 union type.) */
4616 void
4618 {
4619 /* Wipe out memory of synthesized methods. */
4627 /* Splice the implicitly generated functions out of TYPE_FIELDS. */
4631 else
4634 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4635 assignment operators (because they cannot have these methods themselves).
4636 For anonymous unions this is already checked because they are not allowed
4637 in any union, otherwise we have to check it. */
4639 {
4644 {
4647 {
4657 }
4658 }
4659 }
4660 }
4662 /* Warn for an attribute located at LOCATION that appertains to the
4663 class type CLASS_TYPE that has not been properly placed after its
4664 class-key, in it class-specifier. */
4666 void
4668 tree class_type)
4669 {
4673 "attribute ignored in declaration "
4678 }
4680 /* Make sure that a declaration with no declarator is well-formed, i.e.
4681 just declares a tagged type or anonymous union.
4683 Returns the type declared; or NULL_TREE if none. */
4685 tree
4688 {
4691 /* If a class, struct, or enum type is declared by the DECLSPECS
4692 (i.e, if a class-specifier, enum-specifier, or non-typename
4693 elaborated-type-specifier appears in the DECLSPECS),
4694 DECLARED_TYPE is set to the corresponding type. */
4701 {
4707 }
4720 {
4722 "%<auto%> can only be specified for variables "
4725 }
4726 /* Check for an anonymous union. */
4729 {
4730 /* 7/3 In a simple-declaration, the optional init-declarator-list
4731 can be omitted only when declaring a class (clause 9) or
4732 enumeration (7.2), that is, when the decl-specifier-seq contains
4733 either a class-specifier, an elaborated-type-specifier with
4734 a class-key (9.1), or an enum-specifier. In these cases and
4735 whenever a class-specifier or enum-specifier is present in the
4736 decl-specifier-seq, the identifiers in these specifiers are among
4737 the names being declared by the declaration (as class-name,
4738 enum-names, or enumerators, depending on the syntax). In such
4739 cases, and except for the declaration of an unnamed bit-field (9.6),
4740 the decl-specifier-seq shall introduce one or more names into the
4741 program, or shall redeclare a name introduced by a previous
4742 declaration. [Example:
4743 enum { }; // ill-formed
4744 typedef class { }; // ill-formed
4745 --end example] */
4747 {
4750 }
4757 }
4759 else
4760 {
4768 && (!current_class_type
4777 "a storage class can only be specified for objects "
4781 "%<const%> can only be specified for objects and "
4785 "%<volatile%> can only be specified for objects and "
4789 "%<__restrict%> can only be specified for objects and "
4793 "%<__thread%> can only be specified for objects "
4801 }
4804 {
4805 location_t loc;
4808 /* For a non-template class, use the name location. */
4810 else
4811 /* For a template class (an explicit instantiation), use the
4812 current location. */
4816 /* [dcl.attr.grammar]/4:
4818 No attribute-specifier-seq shall appertain to an explicit
4819 instantiation. */
4820 {
4823 declared_type))
4825 "no attribute can be applied to "
4827 }
4828 else
4830 }
4833 }
4835 /* Called when a declaration is seen that contains no names to declare.
4836 If its type is a reference to a structure, union or enum inherited
4837 from a containing scope, shadow that tag name for the current scope
4838 with a forward reference.
4839 If its type defines a new named structure or union
4840 or defines an enum, it is valid but we need not do anything here.
4841 Otherwise, it is an error.
4843 C++: may have to grok the declspecs to learn about static,
4844 complain for anonymous unions.
4846 Returns the TYPE declared -- or NULL_TREE if none. */
4848 tree
4850 {
4860 /* This is where the variables in an anonymous union are
4861 declared. An anonymous union declaration looks like:
4862 union { ... } ;
4863 because there is no declarator after the union, the parser
4864 sends that declaration here. */
4866 {
4870 {
4874 }
4875 }
4878 }
4879 \f
4880 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4882 tree
4886 {
4887 tree attrs;
4888 tree type;
4889 enum decl_context context
4895 {
4900 /* A template type parameter or other dependent type. */
4903 else
4905 }
4907 }
4909 /* Process a DECLARATOR for a function-scope variable declaration,
4910 namespace-scope variable declaration, or function declaration.
4911 (Function definitions go through start_function; class member
4912 declarations appearing in the body of the class go through
4913 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4914 If an error occurs, the error_mark_node is returned instead.
4916 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4917 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4918 for an explicitly defaulted function, or SD_DELETED for an explicitly
4919 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4920 implicitly initialized via a default constructor. ATTRIBUTES and
4921 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4923 The scope represented by the context of the returned DECL is pushed
4924 (if it is not the global namespace) and is assigned to
4925 *PUSHED_SCOPE_P. The caller is then responsible for calling
4926 pop_scope on *PUSHED_SCOPE_P if it is set. */
4928 tree
4932 tree attributes,
4933 tree prefix_attributes,
4935 {
4936 tree decl;
4937 tree context;
4944 /* An object declared as __attribute__((deprecated)) suppresses
4945 warnings of uses of other deprecated items. */
4964 /* Is it valid for this decl to have an initializer at all?
4965 If not, set INITIALIZED to zero, which will indirectly
4966 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4969 {
4972 }
4975 {
4979 decl);
4983 }
4989 /* If this is a typedef that names the class for linkage purposes
4990 (7.1.3p8), apply any attributes directly to the type. */
4995 else
4998 /* Set attributes here so if duplicate decl, will have proper attributes. */
5001 /* Dllimported symbols cannot be defined. Static data members (which
5002 can be initialized in-class and dllimported) go through grokfield,
5003 not here, so we don't need to exclude those decls when checking for
5004 a definition. */
5006 {
5009 }
5011 /* If #pragma weak was used, mark the decl weak now. */
5023 {
5027 {
5033 {
5037 else
5038 {
5044 }
5045 }
5046 else
5047 {
5052 {
5059 }
5060 /* Static data member are tricky; an in-class initialization
5061 still doesn't provide a definition, so the in-class
5062 declaration will have DECL_EXTERNAL set, but will have an
5063 initialization. Thus, duplicate_decls won't warn
5064 about this situation, and so we check here. */
5073 }
5074 }
5075 else
5076 {
5078 this_tmpl
5079 ? current_template_parms
5085 }
5087 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
5089 /* Do not mark DECL as an explicit specialization if it was not
5090 already marked as an instantiation; a declaration should
5091 never be marked as a specialization unless we know what
5092 template is being specialized. */
5094 {
5099 else
5102 /* [temp.expl.spec] An explicit specialization of a static data
5103 member of a template is a definition if the declaration
5104 includes an initializer; otherwise, it is a declaration.
5106 We check for processing_specialization so this only applies
5107 to the new specialization syntax. */
5110 }
5113 /* Aliases are definitions. */
5116 decl);
5117 }
5121 /* Enter this declaration into the symbol table. Don't push the plain
5122 VAR_DECL for a variable template. */
5135 {
5136 /* This is a const variable with implicit 'static'. Set
5137 DECL_THIS_STATIC so we can tell it from variables that are
5138 !TREE_PUBLIC because of the anonymous namespace. */
5141 }
5145 {
5149 decl);
5152 else
5156 }
5162 }
5164 /* Process the declaration of a variable DECL. INITIALIZED is true
5165 iff DECL is explicitly initialized. (INITIALIZED is false if the
5166 variable is initialized via an implicitly-called constructor.)
5167 This function must be called for ordinary variables (including, for
5168 example, implicit instantiations of templates), but must not be
5169 called for template declarations. */
5171 void
5173 {
5174 tree type;
5189 /* If an explicit initializer is present, or if this is a definition
5190 of an aggregate, then we need a complete type at this point.
5191 (Scalars are always complete types, so there is nothing to
5192 check.) This code just sets COMPLETE_P; errors (if necessary)
5193 are issued below. */
5195 && !complete_p
5197 {
5199 /* We will not yet have set TREE_READONLY on DECL if the type
5200 was "const", but incomplete, before this point. But, now, we
5201 have a complete type, so we can try again. */
5203 }
5206 /* Is it valid for this decl to have an initializer at all? */
5207 {
5208 /* Don't allow initializations for incomplete types except for
5209 arrays which might be completed by the initialization. */
5215 {
5218 }
5220 {
5223 /* else we already gave an error in start_decl. */
5224 }
5225 }
5227 {
5230 else
5231 {
5233 decl);
5234 /* Change the type so that assemble_variable will give
5235 DECL an rtl we can live with: (mem (const_int 0)). */
5237 }
5238 }
5240 /* Create a new scope to hold this declaration if necessary.
5241 Whether or not a new scope is necessary cannot be determined
5242 until after the type has been completed; if the type is a
5243 specialization of a class template it is not until after
5244 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
5245 will be set correctly. */
5247 }
5249 /* Handle initialization of references. DECL, TYPE, and INIT have the
5250 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
5251 but will be set to a new CLEANUP_STMT if a temporary is created
5252 that must be destroyed subsequently.
5254 Returns an initializer expression to use to initialize DECL, or
5255 NULL if the initialization can be performed statically.
5257 Quotes on semantics can be found in ARM 8.4.3. */
5259 static tree
5261 {
5263 {
5269 }
5273 tf_warning_or_error);
5278 /* Note: default conversion is only called in very special cases. */
5281 /* check_initializer handles this for non-reference variables, but for
5282 references we need to do it here or the initializer will get the
5283 incomplete array type and confuse later calls to
5284 cp_complete_array_type. */
5289 {
5293 }
5295 /* Convert INIT to the reference type TYPE. This may involve the
5296 creation of a temporary, whose lifetime must be the same as that
5297 of the reference. If so, a DECL_EXPR for the temporary will be
5298 added just after the DECL_EXPR for DECL. That's why we don't set
5299 DECL_INITIAL for local references (instead assigning to them
5300 explicitly); we need to allow the temporary to be initialized
5301 first. */
5303 tf_warning_or_error);
5304 }
5306 /* Designated initializers in arrays are not supported in GNU C++.
5307 The parser cannot detect this error since it does not know whether
5308 a given brace-enclosed initializer is for a class type or for an
5309 array. This function checks that CE does not use a designated
5310 initializer. If it does, an error is issued. Returns true if CE
5311 is valid, i.e., does not have a designated initializer. */
5313 bool
5316 {
5317 /* Designated initializers for array elements are not supported. */
5319 {
5320 /* The parser only allows identifiers as designated
5321 initializers. */
5323 {
5327 }
5329 {
5333 }
5341 {
5342 /* A C99 designator is OK if it matches the current index. */
5345 else
5347 }
5348 else
5353 }
5356 }
5358 /* When parsing `int a[] = {1, 2};' we don't know the size of the
5359 array until we finish parsing the initializer. If that's the
5360 situation we're in, update DECL accordingly. */
5362 static void
5364 {
5370 {
5371 /* do_default is really a C-ism to deal with tentative definitions.
5372 But let's leave it here to ease the eventual merge. */
5377 /* Check that there are no designated initializers in INIT, as
5378 those are not supported in GNU C++, and as the middle-end
5379 will crash if presented with a non-numeric designated
5380 initializer. */
5382 {
5385 HOST_WIDE_INT i;
5389 }
5392 {
5394 do_default);
5396 {
5400 }
5402 {
5404 {
5407 }
5408 /* If a `static' var's size isn't known, make it extern as
5409 well as static, so it does not get allocated. If it's not
5410 `static', then don't mark it extern; finish_incomplete_decl
5411 will give it a default size and it will get allocated. */
5414 }
5416 {
5419 }
5420 }
5425 }
5426 }
5428 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
5429 any appropriate error messages regarding the layout. */
5431 static void
5433 {
5434 tree type;
5440 /* If we haven't already laid out this declaration, do so now.
5441 Note that we must not call complete type for an external object
5442 because it's type might involve templates that we are not
5443 supposed to instantiate yet. (And it's perfectly valid to say
5444 `extern X x' for some incomplete type `X'.) */
5453 {
5454 /* An automatic variable with an incomplete type: that is an error.
5455 Don't talk about array types here, since we took care of that
5456 message in grokdeclarator. */
5460 }
5461 #if 0
5462 /* Keep this code around in case we later want to control debug info
5463 based on whether a type is "used". (jason 1999-11-11) */
5466 /* Let debugger know it should output info for this type. */
5471 #endif
5476 {
5479 else
5480 {
5484 }
5485 }
5486 }
5488 /* If a local static variable is declared in an inline function, or if
5489 we have a weak definition, we must endeavor to create only one
5490 instance of the variable at link-time. */
5492 void
5494 {
5495 /* Static data in a function with comdat linkage also has comdat
5496 linkage. */
5498 /* Don't mess with __FUNCTION__. */
5503 {
5505 {
5506 /* With weak symbols, we simply make the variable COMDAT;
5507 that will cause copies in multiple translations units to
5508 be merged. */
5510 }
5511 else
5512 {
5515 {
5516 /* Without weak symbols, we can use COMMON to merge
5517 uninitialized variables. */
5520 }
5521 else
5522 {
5523 /* While for initialized variables, we must use internal
5524 linkage -- which means that multiple copies will not
5525 be merged. */
5531 "%q#D are wrong (you%'ll wind up with "
5533 else
5535 "static data %q#D are wrong (you%'ll wind "
5541 }
5542 }
5543 }
5544 }
5546 /* Issue an error message if DECL is an uninitialized const variable. */
5548 static void
5550 {
5553 /* ``Unless explicitly declared extern, a const object does not have
5554 external linkage and must be initialized. ($8.4; $12.1)'' ARM
5555 7.1.6 */
5560 {
5568 else
5569 {
5573 decl);
5575 }
5578 {
5579 tree defaulted_ctor;
5586 "constructor is not user-provided because it is "
5589 "and the implicitly-defined constructor does not "
5591 }
5592 }
5593 }
5594 \f
5595 /* Structure holding the current initializer being processed by reshape_init.
5596 CUR is a pointer to the current element being processed, END is a pointer
5597 after the last element present in the initializer. */
5598 struct reshape_iter
5599 {
5602 };
5606 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
5607 returned is the next FIELD_DECL (possibly FIELD itself) that can be
5608 initialized. If there are no more such fields, the return value
5609 will be NULL. */
5611 tree
5613 {
5622 }
5624 /* Return true for [dcl.init.list] direct-list-initialization from
5625 single element of enumeration with a fixed underlying type. */
5627 bool
5629 {
5638 }
5640 /* Subroutine of reshape_init_array and reshape_init_vector, which does
5641 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
5642 INTEGER_CST representing the size of the array minus one (the maximum index),
5643 or NULL_TREE if the array was declared without specifying the size. D is
5644 the iterator within the constructor. */
5646 static tree
5648 tsubst_flags_t complain)
5649 {
5650 tree new_init;
5655 /* The initializer for an array is always a CONSTRUCTOR. */
5659 {
5660 /* Minus 1 is used for zero sized arrays. */
5666 /* sizetype is sign extended, not zero extended. */
5667 else
5669 }
5671 /* Loop until there are no more initializers. */
5675 {
5676 tree elt_init;
5681 complain);
5689 /* This can happen with an invalid initializer (c++/54501). */
5692 }
5695 }
5697 /* Subroutine of reshape_init_r, processes the initializers for arrays.
5698 Parameters are the same of reshape_init_r. */
5700 static tree
5702 {
5711 }
5713 /* Subroutine of reshape_init_r, processes the initializers for vectors.
5714 Parameters are the same of reshape_init_r. */
5716 static tree
5718 {
5724 {
5727 {
5732 }
5735 }
5737 /* For a vector, we initialize it as an array of the appropriate size. */
5742 }
5744 /* Subroutine of reshape_init_r, processes the initializers for classes
5745 or union. Parameters are the same of reshape_init_r. */
5747 static tree
5749 tsubst_flags_t complain)
5750 {
5751 tree field;
5752 tree new_init;
5756 /* The initializer for a class is always a CONSTRUCTOR. */
5761 {
5762 /* [dcl.init.aggr]
5764 An initializer for an aggregate member that is an
5765 empty class shall have the form of an empty
5766 initializer-list {}. */
5768 {
5772 }
5774 }
5776 /* Loop through the initializable fields, gathering initializers. */
5778 {
5779 tree field_init;
5782 /* Handle designated initializers, as an extension. */
5784 {
5789 /* We already reshaped this. */
5793 else
5794 {
5799 }
5802 {
5807 }
5808 }
5810 /* If we processed all the member of the class, we are done. */
5820 {
5821 /* This can happen with an invalid initializer for a flexible
5822 array member (c++/54441). */
5826 }
5830 /* [dcl.init.aggr]
5832 When a union is initialized with a brace-enclosed
5833 initializer, the braces shall only contain an
5834 initializer for the first member of the union. */
5839 }
5842 }
5844 /* Subroutine of reshape_init_r. We're in a context where C99 initializer
5845 designators are not valid; either complain or return true to indicate
5846 that reshape_init_r should return error_mark_node. */
5848 static bool
5850 {
5852 {
5856 else
5858 }
5860 }
5862 /* Subroutine of reshape_init, which processes a single initializer (part of
5863 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5864 iterator within the CONSTRUCTOR which points to the initializer to process.
5865 FIRST_INITIALIZER_P is true if this is the first initializer of the
5866 outermost CONSTRUCTOR node. */
5868 static tree
5870 tsubst_flags_t complain)
5871 {
5882 {
5883 /* A complex type can be initialized from one or two initializers,
5884 but braces are not elided. */
5887 {
5889 {
5892 else
5894 }
5895 }
5897 {
5905 }
5907 }
5909 /* A non-aggregate type is always initialized with a single
5910 initializer. */
5912 {
5913 /* It is invalid to initialize a non-aggregate type with a
5914 brace-enclosed initializer before C++0x.
5915 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
5916 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
5917 a CONSTRUCTOR (with a record type). */
5919 /* Don't complain about a capture-init. */
5922 {
5924 {
5926 /* Isn't value-initialization. */
5928 {
5931 type);
5933 }
5934 }
5935 else
5937 }
5941 }
5943 /* "If T is a class type and the initializer list has a single element of
5944 type cv U, where U is T or a class derived from T, the object is
5945 initialized from that element." Even if T is an aggregate. */
5947 && first_initializer_p
5950 {
5953 }
5955 /* [dcl.init.aggr]
5957 All implicit type conversions (clause _conv_) are considered when
5958 initializing the aggregate member with an initializer from an
5959 initializer-list. If the initializer can initialize a member,
5960 the member is initialized. Otherwise, if the member is itself a
5961 non-empty subaggregate, brace elision is assumed and the
5962 initializer is considered for the initialization of the first
5963 member of the subaggregate. */
5965 /* But don't try this for the first initializer, since that would be
5966 looking through the outermost braces; A a2 = { a1 }; is not a
5967 valid aggregate initialization. */
5968 && !first_initializer_p
5971 complain)))
5972 {
5975 }
5977 /* [dcl.init.string]
5979 A char array (whether plain char, signed char, or unsigned char)
5980 can be initialized by a string-literal (optionally enclosed in
5981 braces); a wchar_t array can be initialized by a wide
5982 string-literal (optionally enclosed in braces). */
5985 {
5988 /* Strip one level of braces if and only if they enclose a single
5989 element (as allowed by [dcl.init.string]). */
5993 {
5995 }
5997 /* If it's a string literal, then it's the initializer for the array
5998 as a whole. Otherwise, continue with normal initialization for
5999 array types (one value per array element). */
6001 {
6006 }
6007 }
6009 /* The following cases are about aggregates. If we are not within a full
6010 initializer already, and there is not a CONSTRUCTOR, it means that there
6011 is a missing set of braces (that is, we are processing the case for
6012 which reshape_init exists). */
6014 {
6016 {
6018 /* There is no need to reshape pointer-to-member function
6019 initializers, as they are always constructed correctly
6020 by the front end. */
6021 ;
6023 /* For a nested compound literal, there is no need to reshape since
6024 brace elision is not allowed. Even if we decided to allow it,
6025 we should add a call to reshape_init in finish_compound_literal,
6026 before calling digest_init, so changing this code would still
6027 not be necessary. */
6029 else
6030 {
6034 }
6035 }
6040 type);
6041 }
6043 /* Dispatch to specialized routines. */
6050 else
6052 }
6054 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
6055 brace-enclosed aggregate initializer.
6057 INIT is the CONSTRUCTOR containing the list of initializers describing
6058 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
6059 It may not presently match the shape of the TYPE; for example:
6061 struct S { int a; int b; };
6062 struct S a[] = { 1, 2, 3, 4 };
6064 Here INIT will hold a vector of four elements, rather than a
6065 vector of two elements, each itself a vector of two elements. This
6066 routine transforms INIT from the former form into the latter. The
6067 revised CONSTRUCTOR node is returned. */
6069 tree
6071 {
6073 reshape_iter d;
6074 tree new_init;
6080 /* An empty constructor does not need reshaping, and it is always a valid
6081 initializer. */
6085 /* Handle [dcl.init.list] direct-list-initialization from
6086 single element of enumeration with a fixed underlying type. */
6088 {
6092 {
6095 }
6096 else
6098 }
6100 /* Recurse on this CONSTRUCTOR. */
6108 /* Make sure all the element of the constructor were used. Otherwise,
6109 issue an error about exceeding initializers. */
6111 {
6115 }
6122 }
6124 /* Verify array initializer. Returns true if errors have been reported. */
6126 bool
6128 {
6131 /* The array type itself need not be complete, because the
6132 initializer may tell us how many elements are in the array.
6133 But, the elements of the array must be complete. */
6135 {
6139 else
6142 }
6143 /* A compound literal can't have variable size. */
6147 {
6150 }
6152 }
6154 /* Subroutine of check_initializer; args are passed down from that function.
6155 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
6157 static tree
6160 {
6163 }
6165 /* Verify INIT (the initializer for DECL), and record the
6166 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
6167 grok_reference_init.
6169 If the return value is non-NULL, it is an expression that must be
6170 evaluated dynamically to initialize DECL. */
6172 static tree
6174 {
6177 tree core_type;
6179 /* Things that are going to be initialized need to have complete
6180 type. */
6184 {
6185 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
6186 it doesn't have storage to be initialized. */
6189 }
6192 /* We will have already complained. */
6196 {
6199 }
6201 {
6206 }
6207 else
6208 /* There is no way to make a variable-sized class type in GNU C++. */
6212 {
6215 {
6217 {
6220 }
6222 {
6224 "scalar object %qD requires one element in "
6228 }
6229 }
6230 }
6233 {
6240 }
6242 ;
6245 {
6247 {
6250 }
6253 /* Do not reshape constructors of vectors (they don't need to be
6254 reshaped. */
6256 {
6258 {
6260 tf_warning_or_error);
6262 }
6264 {
6265 /* Don't reshape if the class has constructors. */
6268 "in C++98 %qD must be initialized by "
6270 decl);
6271 }
6273 {
6276 }
6277 else
6278 {
6281 }
6282 }
6286 {
6289 /* We get here with code like `int a (2);' */
6291 tf_warning_or_error);
6292 }
6294 /* If DECL has an array type without a specific bound, deduce the
6295 array size from the initializer. */
6309 {
6312 /* A constructor call is a non-trivial initializer even if
6313 it isn't explicitly written. */
6317 /* If this is a constexpr initializer, expand_default_init will
6318 have returned an INIT_EXPR rather than a CALL_EXPR. In that
6319 case, pull the initializer back out and pass it down into
6320 store_init_value. */
6325 {
6328 /* Don't call digest_init; it's unnecessary and will complain
6329 about aggregate initialization of non-aggregate classes. */
6331 }
6333 {
6334 /* Declared constexpr, but no suitable initializer; massage
6335 init appropriately so we can pass it into store_init_value
6336 for the error. */
6339 {
6343 }
6345 }
6346 else
6348 }
6351 {
6352 /* In aggregate initialization of a variable, each element
6353 initialization is a full-expression because there is no
6354 enclosing expression. */
6369 }
6370 }
6371 else
6372 {
6380 }
6386 {
6387 /* We might have set these in cp_finish_decl. */
6390 }
6394 {
6402 else
6406 {
6410 }
6412 }
6415 }
6417 /* If DECL is not a local variable, give it RTL. */
6419 static void
6421 {
6425 /* Set the DECL_ASSEMBLER_NAME for the object. */
6427 {
6428 /* The `register' keyword, when used together with an
6429 asm-specification, indicates that the variable should be
6430 placed in a particular register. */
6432 {
6435 }
6436 else
6437 {
6442 }
6443 }
6445 /* Handle non-variables up front. */
6447 {
6450 }
6452 /* If we see a class member here, it should be a static data
6453 member. */
6455 {
6457 /* An in-class declaration of a static data member should be
6458 external; it is only a declaration, and not a definition. */
6463 }
6465 /* We don't create any RTL for local variables. */
6469 /* We defer emission of local statics until the corresponding
6470 DECL_EXPR is expanded. But with constexpr its function might never
6471 be expanded, so go ahead and tell cgraph about the variable now. */
6476 /* Defer template instantiations. */
6481 /* If we're not deferring, go ahead and assemble the variable. */
6484 }
6486 /* walk_tree helper for wrap_temporary_cleanups, below. */
6488 static tree
6490 {
6491 /* Stop at types or full-expression boundaries. */
6494 {
6497 }
6500 {
6505 /* Tell honor_protect_cleanup_actions to handle this as a separate
6506 cleanup. */
6510 }
6513 }
6515 /* We're initializing a local variable which has a cleanup GUARD. If there
6516 are any temporaries used in the initializer INIT of this variable, we
6517 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
6518 variable will be cleaned up properly if one of them throws.
6520 Unfortunately, there's no way to express this properly in terms of
6521 nesting, as the regions for the temporaries overlap the region for the
6522 variable itself; if there are two temporaries, the variable needs to be
6523 the first thing destroyed if either of them throws. However, we only
6524 want to run the variable's cleanup if it actually got constructed. So
6525 we need to guard the temporary cleanups with the variable's cleanup if
6526 they are run on the normal path, but not if they are run on the
6527 exceptional path. We implement this by telling
6528 honor_protect_cleanup_actions to strip the variable cleanup from the
6529 exceptional path. */
6531 static void
6533 {
6535 }
6537 /* Generate code to initialize DECL (a local variable). */
6539 static void
6541 {
6543 tree cleanup;
6551 {
6552 /* If we used it already as memory, it must stay in memory. */
6556 }
6561 /* Compute and store the initial value. */
6566 /* Generate a cleanup, if necessary. */
6569 /* Perform the initialization. */
6571 {
6575 {
6576 /* Stick simple initializers in DECL_INITIAL so that
6577 -Wno-init-self works (c++/34772). */
6582 {
6586 OPT_Winit_self,
6588 }
6589 }
6590 else
6591 {
6594 /* If we're only initializing a single object, guard the
6595 destructors of any temporaries used in its initializer with
6596 its destructor. This isn't right for arrays because each
6597 element initialization is a full-expression. */
6606 saved_stmts_are_full_exprs_p;
6607 }
6608 }
6610 /* Set this to 0 so we can tell whether an aggregate which was
6611 initialized was ever used. Don't do this if it has a
6612 destructor, so we don't complain about the 'resource
6613 allocation is initialization' idiom. Now set
6614 attribute((unused)) on types so decls of that type will be
6615 marked used. (see TREE_USED, above.) */
6617 && ! already_used
6626 }
6628 /* DECL is a VAR_DECL for a compiler-generated variable with static
6629 storage duration (like a virtual table) whose initializer is a
6630 compile-time constant. Initialize the variable and provide it to the
6631 back end. */
6633 void
6635 {
6636 tree init;
6646 }
6648 /* INIT is the initializer for a variable, as represented by the
6649 parser. Returns true iff INIT is value-dependent. */
6651 static bool
6653 {
6655 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
6658 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
6659 {
6672 }
6673 else
6674 /* It must be a simple expression, e.g., int i = 3; */
6678 }
6680 // Returns true if a DECL is VAR_DECL with the concept specifier.
6683 {
6685 // Not all variables have DECL_LANG_SPECIFIC.
6688 }
6690 /* A helper function to be called via walk_tree. If any label exists
6691 under *TP, it is (going to be) forced. Set has_forced_label_in_static. */
6693 static tree
6695 {
6701 }
6703 /* Finish processing of a declaration;
6704 install its line number and initial value.
6705 If the length of an array type is not known before,
6706 it must be determined now, from the initial value, or it is an error.
6708 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
6709 true, then INIT is an integral constant expression.
6711 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
6712 if the (init) syntax was used. */
6714 void
6717 {
6718 tree type;
6723 tree auto_node;
6728 {
6732 }
6735 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
6742 /* Warn about register storage specifiers except when in GNU global
6743 or local register variable extension. */
6745 {
6748 "ISO C++17 does not allow %<register%> storage "
6750 else
6753 }
6755 /* If a name was specified, get the string. */
6770 {
6771 tree d_init;
6773 {
6777 {
6778 /* init is null because we're deferring instantiating the
6779 initializer until we need it. Well, we need it now. */
6782 }
6785 }
6788 {
6792 tf_warning_or_error);
6794 }
6804 {
6809 }
6811 }
6815 {
6818 }
6826 {
6827 tree clone;
6829 {
6830 /* FIXME check this is 1st decl. */
6835 {
6839 }
6841 }
6843 {
6846 else
6848 }
6849 }
6852 {
6854 /* If DECL is a reference, then we want to know whether init is a
6855 reference constant; init_const_expr_p as passed tells us whether
6856 it's an rvalue constant. */
6860 {
6861 /* Set these flags now for templates. We'll update the flags in
6862 store_init_value for instantiations. */
6865 /* FIXME setting TREE_CONSTANT on refs breaks the back end. */
6868 }
6869 }
6872 {
6875 /* Add this declaration to the statement-tree. */
6882 {
6885 }
6887 /* Generally, initializers in templates are expanded when the
6888 template is instantiated. But, if DECL is a variable constant
6889 then it can be used in future constant expressions, so its value
6890 must be available. */
6899 && init_const_expr_p
6903 {
6904 /* This variable seems to be a non-dependent constant, so process
6905 its initializer. If check_initializer returns non-null the
6906 initialization wasn't constant after all. */
6907 tree init_code;
6913 }
6915 {
6916 /* Deduce array size even if the initializer is dependent. */
6918 /* And complain about multiple initializers. */
6922 tf_warning_or_error);
6923 }
6928 {
6931 }
6933 }
6935 /* Just store non-static data member initializers for later. */
6939 /* Take care of TYPE_DECLs up front. */
6941 {
6944 {
6948 }
6950 /* If we have installed this as the canonical typedef for this
6951 type, and that type has not been defined yet, delay emitting
6952 the debug information for it, as we will emit it later. */
6958 at_eof);
6960 }
6962 /* A reference will be modified here, as it is initialized. */
6966 {
6969 }
6972 {
6973 /* If this is a local variable that will need a mangled name,
6974 register it now. We must do this before processing the
6975 initializer for the variable, since the initialization might
6976 require a guard variable, and since the mangled name of the
6977 guard variable will depend on the mangled name of this
6978 variable. */
6982 {
6984 /* Normally has_forced_label_in_static is set during GIMPLE
6985 lowering, but [cd]tors are never actually compiled directly.
6986 We need to set this early so we can deal with the label
6987 address extension. */
6991 {
6994 }
6995 /* And make sure it's in the symbol table for
6996 c_parse_final_cleanups to find. */
6998 }
7000 /* Convert the initializer to the type of DECL, if we have not
7001 already initialized DECL. */
7003 /* If !DECL_EXTERNAL then DECL is being defined. In the
7004 case of a static data member initialized inside the
7005 class-specifier, there can be an initializer even if DECL
7006 is *not* defined. */
7008 {
7012 /* Handle:
7014 [dcl.init]
7016 The memory occupied by any object of static storage
7017 duration is zero-initialized at program startup before
7018 any other initialization takes place.
7020 We cannot create an appropriate initializer until after
7021 the type of DECL is finalized. If DECL_INITIAL is set,
7022 then the DECL is statically initialized, and any
7023 necessary zero-initialization has already been performed. */
7028 /* Remember that the initialization for this variable has
7029 taken place. */
7031 /* This declaration is the definition of this variable,
7032 unless we are initializing a static data member within
7033 the class specifier. */
7036 }
7037 /* If the variable has an array type, lay out the type, even if
7038 there is no initializer. It is valid to index through the
7039 array, and we must get TYPE_ALIGN set correctly on the array
7040 type. */
7047 /* So decl is a global variable or a static member of a
7048 non local class. Record the types it uses
7049 so that we can decide later to emit debug info for them. */
7051 }
7053 /* Add this declaration to the statement-tree. This needs to happen
7054 after the call to check_initializer so that the DECL_EXPR for a
7055 reference temp is added before the DECL_EXPR for the reference itself. */
7057 {
7058 /* If we're building a variable sized type, and we might be
7059 reachable other than via the top of the current binding
7060 level, then create a new BIND_EXPR so that we deallocate
7061 the object at the right time. */
7066 {
7067 tree bind;
7072 }
7074 }
7076 /* Let the middle end know about variables and functions -- but not
7077 static data members in uninstantiated class templates. */
7079 {
7081 {
7084 }
7086 /* This needs to happen after the linkage is set. */
7090 {
7091 /* If a TREE_READONLY variable needs initialization
7092 at runtime, it is no longer readonly and we need to
7093 avoid MEM_READONLY_P being set on RTL created for it. */
7095 {
7099 }
7103 /* Likewise if it needs destruction. */
7106 }
7110 /* Check for abstractness of the type. Notice that there is no
7111 need to strip array types here since the check for those types
7112 is already done within create_array_type_for_decl. */
7116 /* No initialization required. */
7117 ;
7119 {
7121 {
7123 {
7124 /* An out-of-class default definition is defined at
7125 the point where it is explicitly defaulted. */
7130 }
7131 else
7133 }
7134 /* else no initialization required. */
7135 }
7139 {
7142 }
7143 /* A variable definition. */
7145 /* Initialize the local variable. */
7148 /* If a variable is defined, and then a subsequent
7149 definition with external linkage is encountered, we will
7150 get here twice for the same variable. We want to avoid
7151 calling expand_static_init more than once. For variables
7152 that are not static data members, we can call
7153 expand_static_init only when we actually process the
7154 initializer. It is not legal to redeclare a static data
7155 member, so this issue does not arise in that case. */
7158 }
7160 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
7161 reference, insert it in the statement-tree now. */
7163 {
7168 }
7174 }
7176 /* For class TYPE return itself or some its bases that contain
7177 any direct non-static data members. Return error_mark_node if an
7178 error has been diagnosed. */
7180 static tree
7182 {
7190 {
7194 else
7199 }
7201 {
7209 }
7210 else
7220 {
7225 {
7227 {
7232 }
7236 /* OK, found the same base along another path. We'll complain
7239 {
7241 "classes %qT and %qT have non-static data "
7244 }
7245 else
7247 }
7248 }
7250 }
7252 /* Return std::tuple_size<TYPE>::value. */
7254 static tree
7256 {
7272 else
7274 }
7276 /* Return std::tuple_element<I,TYPE>::type. */
7278 static tree
7280 {
7288 tf_warning_or_error);
7291 }
7293 /* Return e.get<i>() or get<i>(e). */
7295 static tree
7297 {
7305 /* [The id-expression] e is an lvalue if the type of the entity e is an
7306 lvalue reference and an xvalue otherwise. */
7314 {
7319 }
7320 else
7321 {
7327 }
7328 }
7330 /* It's impossible to recover the decltype of a tuple decomposition variable
7331 based on the actual type of the variable, so store it in a hash table. */
7334 static void
7336 {
7340 }
7342 tree
7344 {
7346 }
7348 /* Mangle a decomposition declaration if needed. Arguments like
7349 in cp_finish_decomp. */
7351 void
7353 {
7357 {
7364 }
7365 }
7367 /* Finish a decomposition declaration. DECL is the underlying declaration
7368 "e", FIRST is the head of a chain of decls for the individual identifiers
7369 chained through DECL_CHAIN in reverse order and COUNT is the number of
7370 those decls. */
7372 void
7374 {
7376 {
7377 error_out:
7379 {
7382 {
7385 }
7387 }
7391 }
7395 /* This happens for range for when not in templates.
7396 Still add the DECL_VALUE_EXPRs for later processing. */
7397 || (!processing_template_decl
7399 {
7401 {
7403 {
7409 }
7413 }
7415 }
7421 {
7424 }
7430 {
7435 }
7440 {
7441 tree nelts;
7446 {
7449 }
7452 {
7453 cnt_mismatch:
7458 else
7462 /* Some languages have special plural rules even for large values,
7463 but it is periodic with period of 10, 100, 1000 etc. */
7470 }
7473 {
7481 NULL_TREE);
7484 }
7485 }
7486 /* 2 GNU extensions. */
7488 {
7494 {
7502 t);
7505 }
7506 }
7508 {
7510 {
7513 }
7518 {
7528 NULL_TREE);
7531 }
7532 }
7534 {
7536 {
7540 }
7542 {
7549 }
7555 {
7566 {
7570 }
7571 /* Save the decltype away before reference collapse. */
7577 {
7578 /* In this case the names are variables, not just proxies. */
7581 }
7585 }
7586 /* Ignore reads from the underlying decl performed during initialization
7587 of the individual variables. If those will be read, we'll mark
7588 the underlying decl as read at that point. */
7590 }
7592 {
7595 }
7597 {
7600 }
7602 {
7605 }
7606 else
7607 {
7612 {
7616 }
7620 else
7621 eltscnt++;
7626 {
7630 }
7635 else
7636 {
7638 NULL_TREE);
7644 {
7647 }
7648 i++;
7649 }
7650 }
7652 {
7655 {
7660 }
7661 }
7662 }
7664 /* Returns a declaration for a VAR_DECL as if:
7666 extern "C" TYPE NAME;
7668 had been seen. Used to create compiler-generated global
7669 variables. */
7671 static tree
7673 {
7674 tree decl;
7682 /* If the user has explicitly declared this variable (perhaps
7683 because the code we are compiling is part of a low-level runtime
7684 library), then it is possible that our declaration will be merged
7685 with theirs by pushdecl. */
7691 }
7693 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
7694 if "__cxa_atexit" is not being used) corresponding to the function
7695 to be called when the program exits. */
7697 static tree
7699 {
7700 tree fn_type;
7703 {
7704 tree arg_type;
7707 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
7709 else
7710 /* The parameter to "atexit" is "void (*)(void)". */
7716 }
7719 }
7721 /* Returns a pointer to the `atexit' function. Note that if
7722 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
7723 `__cxa_atexit' function specified in the IA64 C++ ABI. */
7725 static tree
7727 {
7728 tree atexit_fndecl;
7729 tree fn_type;
7730 tree fn_ptr_type;
7738 {
7739 /* The declaration for `__cxa_atexit' is:
7741 int __cxa_atexit (void (*)(void *), void *, void *)
7743 We build up the argument types and then the function type
7744 itself. */
7748 /* First, build the pointer-to-function type for the first
7749 argument. */
7751 /* Then, build the rest of the argument types. */
7754 {
7757 }
7758 else
7759 {
7762 }
7763 /* And the final __cxa_atexit type. */
7766 NULL_TREE);
7769 else
7771 }
7772 else
7773 {
7774 /* The declaration for `atexit' is:
7776 int atexit (void (*)());
7778 We build up the argument types and then the function type
7779 itself. */
7781 /* Build the final atexit type. */
7785 }
7787 /* Now, build the function declaration. */
7795 }
7797 /* Like get_atexit_node, but for thread-local cleanups. */
7799 static tree
7801 {
7802 /* The declaration for `__cxa_thread_atexit' is:
7804 int __cxa_thread_atexit (void (*)(void *), void *, void *) */
7808 NULL_TREE);
7810 /* Now, build the function declaration. */
7814 }
7816 /* Returns the __dso_handle VAR_DECL. */
7818 static tree
7820 {
7824 /* Declare the variable. */
7826 ptr_type_node);
7828 #ifdef HAVE_GAS_HIDDEN
7830 {
7833 }
7834 #endif
7837 }
7839 /* Begin a new function with internal linkage whose job will be simply
7840 to destroy some particular variable. */
7844 static tree
7846 {
7848 tree fntype;
7849 tree fndecl;
7855 /* No need to mangle this. */
7858 /* Build the name of the function. */
7860 /* Build the function declaration. */
7863 /* It's a function with internal linkage, generated by the
7864 compiler. */
7867 /* Make the function `inline' so that it is only emitted if it is
7868 actually needed. It is unlikely that it will be inlined, since
7869 it is only called via a function pointer, but we avoid unnecessary
7870 emissions this way. */
7873 /* Build the parameter. */
7875 {
7880 }
7888 }
7890 /* Finish the cleanup function begun by start_cleanup_fn. */
7892 static void
7894 {
7898 }
7900 /* Generate code to handle the destruction of DECL, an object with
7901 static storage duration. */
7903 tree
7905 {
7906 tree cleanup;
7907 tree addr;
7908 tree compound_stmt;
7909 tree fcall;
7910 tree type;
7913 tree atex_node;
7919 /* If we're using "__cxa_atexit" (or "__cxa_thread_atexit" or
7920 "__aeabi_atexit"), and DECL is a class object, we can just pass the
7921 destructor to "__cxa_atexit"; we don't have to build a temporary
7922 function to do the cleanup. */
7923 dso_parm = (flag_use_cxa_atexit
7928 {
7931 /* Make sure it is accessible. */
7933 tf_warning_or_error);
7934 }
7935 else
7936 {
7937 /* Call build_cleanup before we enter the anonymous function so
7938 that any access checks will be done relative to the current
7939 scope, rather than the scope of the anonymous function. */
7942 /* Now start the function. */
7945 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
7946 to the original function, rather than the anonymous one. That
7947 will make the back end think that nested functions are in use,
7948 which causes confusion. */
7953 /* Create the body of the anonymous function. */
7958 }
7960 /* Call atexit with the cleanup function. */
7966 else
7970 {
7971 /* We must convert CLEANUP to the type that "__cxa_atexit"
7972 expects. */
7974 /* "__cxa_atexit" will pass the address of DECL to the
7975 cleanup function. */
7978 /* The declared type of the parameter to "__cxa_atexit" is
7979 "void *". For plain "T*", we could just let the
7980 machinery in cp_build_function_call convert it -- but if the
7981 type is "cv-qualified T *", then we need to convert it
7982 before passing it in, to avoid spurious errors. */
7984 }
7985 else
7986 /* Since the cleanup functions we build ignore the address
7987 they're given, there's no reason to pass the actual address
7988 in, and, in general, it's cheaper to pass NULL than any
7989 other value. */
7994 tf_warning_or_error);
7996 /* Just pass NULL to the dso handle parm if we don't actually
7997 have a DSO handle on this target. */
7999 else
8003 {
8006 {
8009 }
8010 else
8011 {
8014 }
8015 }
8016 else
8017 {
8020 }
8023 }
8025 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
8026 is its initializer. Generate code to handle the construction
8027 and destruction of DECL. */
8029 static void
8031 {
8035 /* Some variables require no dynamic initialization. */
8037 {
8038 /* Make sure the destructor is callable. */
8042 }
8046 {
8050 else
8055 {
8057 "C++11 %<thread_local%> allows dynamic initialization "
8060 }
8062 }
8065 {
8066 /* Emit code to perform this initialization but once. */
8071 /* We don't need thread-safety code for thread-local vars. */
8075 /* Emit code to perform this initialization but once. This code
8076 looks like:
8078 static <type> guard;
8079 if (!__atomic_load (guard.first_byte)) {
8080 if (__cxa_guard_acquire (&guard)) {
8081 bool flag = false;
8082 try {
8083 // Do initialization.
8084 flag = true; __cxa_guard_release (&guard);
8085 // Register variable for destruction at end of program.
8086 } catch {
8087 if (!flag) __cxa_guard_abort (&guard);
8088 }
8089 }
8090 }
8092 Note that the `flag' variable is only set to 1 *after* the
8093 initialization is complete. This ensures that an exception,
8094 thrown during the construction, will cause the variable to
8095 reinitialized when we pass through this code again, as per:
8097 [stmt.dcl]
8099 If the initialization exits by throwing an exception, the
8100 initialization is not complete, so it will be tried again
8101 the next time control enters the declaration.
8103 This process should be thread-safe, too; multiple threads
8104 should not be able to initialize the variable more than
8105 once. */
8107 /* Create the guard variable. */
8110 /* Begin the conditional initialization. */
8117 {
8130 acquire_fn = push_library_fn
8133 NULL_TREE),
8138 NULL_TREE);
8148 inner_if_stmt);
8156 void_node,
8160 /* Do the initialization itself. */
8162 init = add_stmt_to_compound
8164 init = add_stmt_to_compound
8166 }
8167 else
8170 /* Use atexit to register a function for destroying this static
8171 variable. */
8177 {
8181 }
8186 }
8189 else
8191 }
8193 \f
8194 /* Make TYPE a complete type based on INITIAL_VALUE.
8195 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
8196 2 if there was no information (in which case assume 0 if DO_DEFAULT),
8197 3 if the initializer list is empty (in pedantic mode). */
8199 int
8201 {
8205 /* Don't get confused by a CONSTRUCTOR for some other type. */
8212 {
8214 tree value;
8216 /* An array of character type can be initialized from a
8217 brace-enclosed string constant.
8219 FIXME: this code is duplicated from reshape_init. Probably
8220 we should just call reshape_init here? */
8224 {
8231 }
8233 /* If any of the elements are parameter packs, we can't actually
8234 complete this type now because the array size is dependent. */
8236 {
8239 {
8242 }
8243 }
8244 }
8248 /* We can create the array before the element type is complete, which
8249 means that we didn't have these two bits set in the original type
8250 either. In completing the type, we are expected to propagate these
8251 bits. See also complete_type which does the same thing for arrays
8252 of fixed size. */
8255 {
8260 }
8263 }
8265 /* As above, but either give an error or reject zero-size arrays, depending
8266 on COMPLAIN. */
8268 int
8271 {
8274 /* In SFINAE context we can't be lenient about zero-size arrays. */
8281 {
8287 {
8290 }
8294 }
8296 }
8297 \f
8298 /* Return zero if something is declared to be a member of type
8299 CTYPE when in the context of CUR_TYPE. STRING is the error
8300 message to print in that case. Otherwise, quietly return 1. */
8302 static int
8304 {
8306 {
8309 else
8312 }
8314 }
8315 \f
8316 /* Subroutine of `grokdeclarator'. */
8318 /* Generate errors possibly applicable for a given set of specifiers.
8319 This is for ARM $7.1.2. */
8321 static void
8329 {
8331 {
8368 }
8372 && !flag_noexcept_type
8378 }
8380 /* DECL is a member function or static data member and is presently
8381 being defined. Check that the definition is taking place in a
8382 valid namespace. */
8384 static void
8386 {
8387 /* These checks only apply to member functions and static data
8388 members. */
8390 /* We check for problems with specializations in pt.c in
8391 check_specialization_namespace, where we can issue better
8392 diagnostics. */
8395 /* We check this in check_explicit_instantiation_namespace. */
8398 /* [class.mfct]
8400 A member function definition that appears outside of the
8401 class definition shall appear in a namespace scope enclosing
8402 the class definition.
8404 [class.static.data]
8406 The definition for a static data member shall appear in a
8407 namespace scope enclosing the member's class definition. */
8411 }
8413 /* Build a PARM_DECL for the "this" parameter of FN. TYPE is the
8414 METHOD_TYPE for a non-static member function; QUALS are the
8415 cv-qualifiers that apply to the function. */
8417 tree
8419 {
8420 tree this_type;
8421 tree qual_type;
8422 tree parm;
8423 cp_cv_quals this_quals;
8426 {
8427 this_type
8430 }
8431 else
8433 /* The `this' parameter is implicitly `const'; it cannot be
8434 assigned to. */
8440 }
8442 /* DECL is a static member function. Complain if it was declared
8443 with function-cv-quals. */
8445 static void
8447 {
8450 decl);
8451 }
8453 // Check that FN takes no arguments and returns bool.
8454 static void
8456 {
8457 // A constraint is nullary.
8461 // The declared return type of the concept shall be bool, and
8462 // it shall not be deduced from it definition.
8468 }
8470 /* Helper function. Replace the temporary this parameter injected
8471 during cp_finish_omp_declare_simd with the real this parameter. */
8473 static tree
8475 {
8484 }
8486 /* CTYPE is class type, or null if non-class.
8487 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
8488 or METHOD_TYPE.
8489 DECLARATOR is the function's name.
8490 PARMS is a chain of PARM_DECLs for the function.
8491 VIRTUALP is truthvalue of whether the function is virtual or not.
8492 FLAGS are to be passed through to `grokclassfn'.
8493 QUALS are qualifiers indicating whether the function is `const'
8494 or `volatile'.
8495 RAISES is a list of exceptions that this function can raise.
8496 CHECK is 1 if we must find this method in CTYPE, 0 if we should
8497 not look, and -1 if we should not call `grokclassfn' at all.
8499 SFK is the kind of special function (if any) for the new function.
8501 Returns `NULL_TREE' if something goes wrong, after issuing
8502 applicable error messages. */
8504 static tree
8506 tree type,
8507 tree declarator,
8508 tree parms,
8509 tree orig_declarator,
8510 tree decl_reqs,
8513 cp_cv_quals quals,
8514 cp_ref_qualifier rqual,
8515 tree raises,
8521 special_function_kind sfk,
8524 tree in_namespace,
8526 location_t location)
8527 {
8528 tree decl;
8530 tree t;
8532 // Was the concept specifier present?
8535 // Concept declarations must have a corresponding definition.
8537 {
8540 }
8549 /* Set the constraints on the declaration. */
8551 {
8556 /* Adjust the required expression into a constraint. */
8562 }
8564 /* If we have an explicit location, use it, otherwise use whatever
8565 build_lang_decl used (probably input_location). */
8570 {
8575 /* Allocate space to hold the vptr bit if needed. */
8577 }
8583 /* Propagate volatile out from type to decl. */
8587 /* Setup decl according to sfk. */
8589 {
8602 }
8605 {
8608 orig_declarator);
8609 else
8610 {
8615 {
8616 /* Something like `template <class T> friend void f<T>()'. */
8619 orig_declarator);
8621 }
8624 /* A friend declaration of the form friend void f<>(). Record
8625 the information in the TEMPLATE_ID_EXPR. */
8634 {
8637 decl);
8639 }
8642 {
8645 decl);
8647 }
8648 }
8649 }
8651 /* If this decl has namespace scope, set that up. */
8657 /* `main' and builtins have implicit 'C' linkage. */
8672 /* Should probably propagate const out from type to decl I bet (mrs). */
8674 {
8677 }
8683 {
8687 }
8690 {
8701 }
8703 /* Members of anonymous types and local classes have no linkage; make
8704 them internal. If a typedef is made later, this will be changed. */
8710 {
8711 /* [basic.link]: A name with no linkage (notably, the name of a class
8712 or enumeration declared in a local scope) shall not be used to
8713 declare an entity with linkage.
8715 DR 757 relaxes this restriction for C++0x. */
8717 }
8721 {
8724 }
8726 /* If the declaration was declared inline, mark it as such. */
8728 {
8732 }
8736 // If the concept declaration specifier was found, check
8737 // that the declaration satisfies the necessary requirements.
8739 {
8742 }
8746 {
8749 TYPE_UNQUALIFIED,
8750 REF_QUAL_NONE);
8753 {
8757 decl);
8759 }
8762 {
8766 decl);
8768 }
8769 }
8772 {
8774 {
8778 }
8782 }
8787 {
8791 /* [over.literal]/6: Literal operators shall not have C linkage. */
8793 {
8797 }
8800 {
8803 {
8806 }
8810 {
8814 }
8816 {
8820 }
8821 }
8822 else
8823 {
8826 }
8827 }
8830 /* Make the init_value nonzero so pushdecl knows this is not
8831 tentative. error_mark_node is replaced later with the BLOCK. */
8838 {
8839 /* Adjust "omp declare simd" attributes. */
8842 {
8843 tree attr;
8846 {
8851 {
8853 cl = c_omp_declare_simd_clauses_to_numbers
8857 else
8859 }
8860 }
8861 }
8862 }
8864 /* Caller will do the rest of this. */
8871 /* 12.4/3 */
8879 template_count,
8890 {
8893 }
8895 /* Check main's type after attributes have been applied. */
8897 {
8899 integer_type_node))
8900 {
8902 tree newtype;
8906 }
8909 }
8912 {
8914 (processing_template_decl
8916 ? current_template_parms
8923 {
8924 tree ok;
8925 tree pushed_scope;
8928 /* Because grokfndecl is always supposed to return a
8929 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
8930 here. We depend on our callers to figure out that its
8931 really a template that's being returned. */
8936 {
8937 /* Remove the `this' parm added by grokclassfn. */
8940 }
8942 {
8945 }
8947 {
8952 }
8954 /* Since we've smashed OLD_DECL to its
8955 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
8959 /* Attempt to merge the declarations. This can fail, in
8960 the case of some invalid specialization declarations. */
8966 {
8970 }
8974 }
8975 }
8987 }
8989 /* decl is a FUNCTION_DECL.
8990 specifiers are the parsed virt-specifiers.
8992 Set flags to reflect the virt-specifiers.
8994 Returns decl. */
8996 static tree
8998 {
9006 }
9008 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
9009 the linkage that DECL will receive in the object file. */
9011 static void
9013 {
9014 /* A static data member always has static storage duration and
9015 external linkage. Note that static data members are forbidden in
9016 local classes -- the only situation in which a class has
9017 non-external linkage. */
9020 /* For non-template classes, static data members are always put
9021 out in exactly those files where they are defined, just as
9022 with ordinary namespace-scope variables. */
9025 }
9027 /* Create a VAR_DECL named NAME with the indicated TYPE.
9029 If SCOPE is non-NULL, it is the class type or namespace containing
9030 the variable. If SCOPE is NULL, the variable should is created in
9031 the innermost enclosing scope. */
9033 static tree
9035 tree name,
9036 tree orig_declarator,
9043 tree scope)
9044 {
9045 tree decl;
9046 tree explicit_scope;
9053 /* Compute the scope in which to place the variable, but remember
9054 whether or not that scope was explicitly specified by the user. */
9057 {
9058 /* An explicit "extern" specifier indicates a namespace-scope
9059 variable. */
9064 }
9068 template, we need DECL_LANG_SPECIFIC. */
9070 /* Similarly for namespace-scope variables with language linkage
9071 other than C++. */
9074 /* Similarly for static data members. */
9076 /* Similarly for explicit specializations. */
9077 || (orig_declarator
9080 else
9085 else
9089 {
9092 }
9095 {
9097 /* This function is only called with out-of-class definitions. */
9100 }
9101 /* At top level, either `static' or no s.c. makes a definition
9102 (perhaps tentative), and absence of `static' makes it public. */
9104 {
9107 || ! constp
9108 || volatilep
9111 }
9112 /* Not at top level, only `static' makes a static definition. */
9113 else
9114 {
9117 }
9120 {
9122 {
9126 }
9129 }
9131 /* If the type of the decl has no linkage, make sure that we'll
9132 notice that in mark_used. */
9141 {
9142 /* [basic.link]: A name with no linkage (notably, the name of a class
9143 or enumeration declared in a local scope) shall not be used to
9144 declare an entity with linkage.
9146 DR 757 relaxes this restriction for C++0x. */
9149 }
9150 else
9158 /* Check that the variable can be safely declared as a concept.
9159 Note that this also forbids explicit specializations. */
9161 {
9163 {
9166 }
9167 else
9172 }
9175 {
9179 }
9181 // Handle explicit specializations and instantiations of variable templates.
9187 }
9189 /* Create and return a canonical pointer to member function type, for
9190 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
9192 tree
9194 {
9196 tree t;
9201 /* Make sure that we always have the unqualified pointer-to-member
9202 type first. */
9204 {
9207 }
9209 /* If a canonical type already exists for this type, use it. We use
9210 this method instead of type_hash_canon, because it only does a
9211 simple equality check on the list of field members. */
9219 /* Let the front end know this is a pointer to member function. */
9226 delta_type_node);
9232 /* Zap out the name so that the back end will give us the debugging
9233 information for this anonymous RECORD_TYPE. */
9236 /* Cache this pointer-to-member type so that we can find it again
9237 later. */
9246 }
9248 /* Create and return a pointer to data member type. */
9250 tree
9252 {
9254 {
9259 }
9260 else
9261 {
9264 }
9265 }
9267 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
9268 Check to see that the definition is valid. Issue appropriate error
9269 messages. Return 1 if the definition is particularly bad, or 0
9270 otherwise. */
9272 static int
9274 {
9275 /* Avoid redundant diagnostics on out-of-class definitions. */
9278 /* Can't check yet if we don't know the type. */
9281 /* If DECL is declared constexpr, we'll do the appropriate checks
9282 in check_initializer. Similarly for inline static data members. */
9288 {
9291 "in-class initialization of static data member %q#D of "
9295 "%<constexpr%> needed for in-class initialization of "
9297 else
9299 "in-class initialization of static data member %q#D of "
9302 }
9304 /* Motion 10 at San Diego: If a static const integral data member is
9305 initialized with an integral constant expression, the initializer
9306 may appear either in the declaration (within the class), or in
9307 the definition, but not both. If it appears in the class, the
9308 member is a member constant. The file-scope definition is always
9309 required. */
9311 {
9313 "invalid in-class initialization of static data member "
9315 type);
9317 }
9320 "ISO C++ forbids in-class initialization of non-const "
9322 decl);
9325 "ISO C++ forbids initialization of member constant "
9329 }
9331 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
9332 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
9333 expressions out into temporary variables so that walk_tree doesn't
9334 step into them (c++/15764). */
9336 static tree
9338 {
9342 {
9348 }
9352 }
9354 /* Entry point for the above. */
9356 static void
9358 {
9360 /* Break out any function calls into temporary variables. */
9362 }
9364 /* Reduce a SIZEOF_EXPR to its value. */
9366 tree
9368 {
9369 tree r;
9376 else
9382 }
9384 /* Given the SIZE (i.e., number of elements) in an array, compute
9385 an appropriate index type for the array. If non-NULL, NAME is
9386 the name of the entity being declared. */
9388 tree
9390 {
9391 tree itype;
9398 {
9405 /* In C++98, we mark a non-constant array bound with a magic
9407 else
9408 {
9413 {
9416 {
9422 else
9425 }
9429 }
9436 }
9441 /* The array bound must be an integer type. */
9443 {
9448 else
9452 }
9453 }
9455 /* A type is dependent if it is...an array type constructed from any
9456 dependent type or whose size is specified by a constant expression
9457 that is value-dependent. */
9458 /* We can only call value_dependent_expression_p on integral constant
9459 expressions; treat non-constant expressions as dependent, too. */
9463 {
9464 /* We cannot do any checking for a SIZE that isn't known to be
9465 constant. Just build the index type and mark that it requires
9466 structural equality checks. */
9473 }
9476 {
9481 /* Use the folded result for VLAs, too; it will have resolved
9482 SIZEOF_EXPR. */
9484 }
9486 /* Normally, the array-bound will be a constant. */
9488 {
9489 /* Check to see if the array bound overflowed. Make that an
9490 error, no matter how generous we're being. */
9493 /* An array must have a positive number of elements. */
9495 {
9500 else
9503 }
9504 /* As an extension we allow zero-sized arrays. */
9506 {
9508 /* We must fail if performing argument deduction (as
9509 indicated by the state of complain), so that
9510 another substitution can be found. */
9516 else
9518 }
9519 }
9521 /* We don't allow VLAs at non-function scopes, or during
9522 tentative template substitution. */
9525 {
9528 /* `(int) &fn' is not a valid array bound. */
9531 name);
9532 else
9535 }
9537 {
9540 else
9542 }
9544 {
9548 else
9551 }
9554 /* A variable sized array. */
9556 else
9557 {
9558 /* Compute the index of the largest element in the array. It is
9559 one less than the number of elements in the array. We save
9560 and restore PROCESSING_TEMPLATE_DECL so that computations in
9561 cp_build_binary_op will be appropriately folded. */
9562 {
9563 processing_template_decl_sentinel s;
9565 MINUS_EXPR,
9568 complain),
9569 complain);
9571 }
9574 {
9575 /* A variable sized array. */
9582 {
9583 /* We have to add 1 -- in the ubsan routine we generate
9584 LE_EXPR rather than LT_EXPR. */
9589 }
9590 }
9591 /* Make sure that there was no overflow when creating to a signed
9592 index type. (For example, on a 32-bit machine, an array with
9593 size 2^32 - 1 is too big.) */
9596 {
9601 }
9602 }
9604 /* Create and return the appropriate index type. */
9607 /* If the index type were dependent, we would have returned early, so
9608 remember that it isn't. */
9612 }
9614 /* Returns the scope (if any) in which the entity declared by
9615 DECLARATOR will be located. If the entity was declared with an
9616 unqualified name, NULL_TREE is returned. */
9618 tree
9620 {
9624 /* If the declarator-id is a SCOPE_REF, the scope in which the
9625 declaration occurs is the first operand. */
9630 /* Otherwise, the declarator is not a qualified name; the entity will
9631 be declared in the current scope. */
9633 }
9635 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
9636 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
9637 with this type. */
9639 static tree
9641 {
9644 /* If things have already gone awry, bail now. */
9648 /* 8.3.4/1: If the type of the identifier of D contains the auto
9649 type-specifier, the program is ill-formed. */
9651 {
9654 }
9656 /* If there are some types which cannot be array elements,
9657 issue an error-message and return. */
9659 {
9663 else
9670 else
9677 else
9684 else
9690 }
9692 /* [dcl.array]
9694 The constant expressions that specify the bounds of the arrays
9695 can be omitted only for the first member of the sequence. */
9697 {
9701 name);
9702 else
9707 }
9709 /* Figure out the index type for the array. */
9713 /* [dcl.array]
9714 T is called the array element type; this type shall not be [...] an
9715 abstract class type. */
9719 }
9721 /* Returns the smallest location != UNKNOWN_LOCATION among the
9722 three stored in LOCATIONS[ds_const], LOCATIONS[ds_volatile],
9723 and LOCATIONS[ds_restrict]. */
9725 static location_t
9727 {
9742 }
9744 /* Check that it's OK to declare a function with the indicated TYPE
9745 and TYPE_QUALS. SFK indicates the kind of special function (if any)
9746 that this function is. OPTYPE is the type given in a conversion
9747 operator declaration, or the class type for a constructor/destructor.
9748 Returns the actual return type of the function; that may be different
9749 than TYPE if an error occurs, or for certain special functions. */
9751 static tree
9753 tree type,
9754 tree optype,
9757 {
9759 {
9769 else
9780 /* We can't use the proper return type here because we run into
9781 problems with ambiguous bases and covariant returns. */
9784 else
9793 "qualifiers are not allowed on declaration of "
9804 "qualifiers are not allowed on declaration of "
9815 }
9818 }
9820 /* A variable or data member (whose unqualified name is IDENTIFIER)
9821 has been declared with the indicated TYPE. If the TYPE is not
9822 acceptable, issue an error message and return a type to use for
9823 error-recovery purposes. */
9825 tree
9827 {
9829 {
9833 {
9836 }
9837 else
9840 }
9843 }
9845 /* Handle declaring DECL as an inline variable. */
9847 static void
9849 {
9852 {
9856 }
9859 "inline variables are only available "
9862 {
9865 }
9866 }
9869 /* Assign a typedef-given name to a class or enumeration type declared
9870 as anonymous at first. This was split out of grokdeclarator
9871 because it is also used in libcc1. */
9873 void
9875 {
9878 /* Replace the anonymous name with the real name everywhere. */
9880 {
9882 /* We do not rename the debug info representing the
9883 unnamed tagged type because the standard says in
9884 [dcl.typedef] that the naming applies only for
9885 linkage purposes. */
9886 /*debug_hooks->set_name (t, decl);*/
9888 }
9893 /* If this is a typedef within a template class, the nested
9894 type is a (non-primary) template. The name for the
9895 template needs updating as well. */
9900 /* Adjust linkage now that we aren't unnamed anymore. */
9903 /* FIXME remangle member functions; member functions of a
9904 type with external linkage have external linkage. */
9906 /* Check that our job is done, and that it would fail if we
9907 attempted to do it again. */
9909 }
9911 /* Given declspecs and a declarator (abstract or otherwise), determine
9912 the name and type of the object declared and construct a DECL node
9913 for it.
9915 DECLSPECS points to the representation of declaration-specifier
9916 sequence that precedes declarator.
9918 DECL_CONTEXT says which syntactic context this declaration is in:
9919 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
9920 FUNCDEF for a function definition. Like NORMAL but a few different
9921 error messages in each case. Return value may be zero meaning
9922 this definition is too screwy to try to parse.
9923 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
9924 handle member functions (which have FIELD context).
9925 Return value may be zero meaning this definition is too screwy to
9926 try to parse.
9927 PARM for a parameter declaration (either within a function prototype
9928 or before a function body). Make a PARM_DECL, or return void_type_node.
9929 TPARM for a template parameter declaration.
9930 CATCHPARM for a parameter declaration before a catch clause.
9931 TYPENAME if for a typename (in a cast or sizeof).
9932 Don't make a DECL node; just return the ..._TYPE node.
9933 FIELD for a struct or union field; make a FIELD_DECL.
9934 BITFIELD for a field with specified width.
9936 INITIALIZED is as for start_decl.
9938 ATTRLIST is a pointer to the list of attributes, which may be NULL
9939 if there are none; *ATTRLIST may be modified if attributes from inside
9940 the declarator should be applied to the declaration.
9942 When this function is called, scoping variables (such as
9943 CURRENT_CLASS_TYPE) should reflect the scope in which the
9944 declaration occurs, not the scope in which the new declaration will
9945 be placed. For example, on:
9947 void S::f() { ... }
9949 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
9950 should not be `S'.
9952 Returns a DECL (if a declarator is present), a TYPE (if there is no
9953 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
9954 error occurs. */
9956 tree
9962 {
9974 /* True if this declarator is a function definition. */
9978 #if 0
9979 /* See the code below that used this. */
9981 #endif
9983 /* Keep track of what sort of function is being processed
9984 so that we can warn about default return values, or explicit
9985 return values which do not match prescribed defaults. */
9991 /* cv-qualifiers that apply to the declarator, for a declaration of
9992 a member function. */
9994 /* virt-specifiers that apply to the declarator, for a declaration of
9995 a member function. */
9997 /* ref-qualifier that applies to the declarator, for a declaration of
9998 a member function. */
10000 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
10007 /* The unqualified name of the declarator; either an
10008 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
10009 tree unqualified_id;
10010 /* The class type, if any, in which this entity is located,
10011 or NULL_TREE if none. Note that this value may be different from
10012 the current class type; for example if an attempt is made to declare
10013 "A::f" inside "B", this value will be "A". */
10015 /* The NAMESPACE_DECL for the namespace in which this entity is
10016 located. If an unqualified name is used to declare the entity,
10017 this value will be NULL_TREE, even if the entity is located at
10018 namespace scope. */
10020 cp_storage_class storage_class;
10041 // Was concept_p specified? Note that ds_concept
10042 // implies ds_constexpr!
10075 /* Look inside a declarator for the name being declared
10076 and get it as a string, for an error message. */
10078 id_declarator;
10080 {
10085 {
10089 {
10093 }
10097 {
10103 {
10105 {
10106 /* [dcl.meaning]
10108 A declarator-id shall not be qualified except
10109 for ...
10111 None of the cases are permitted in block
10112 scope. */
10115 decl);
10119 else
10123 }
10125 {
10128 {
10131 }
10133 && current_class_type
10135 current_class_type))
10136 {
10140 }
10141 }
10144 }
10146 {
10148 {
10150 {
10153 }
10156 {
10159 }
10166 }
10170 {
10176 }
10177 /* Fall through. */
10184 {
10186 dname);
10188 }
10191 else
10192 {
10199 else
10201 }
10206 }
10208 }
10225 }
10228 }
10230 /* [dcl.fct.edf]
10232 The declarator in a function-definition shall have the form
10233 D1 ( parameter-declaration-clause) ... */
10235 {
10238 }
10243 {
10246 }
10249 {
10252 {
10255 }
10258 {
10260 {
10263 }
10265 {
10268 }
10269 }
10270 }
10272 /* Anything declared one level down from the top level
10273 must be one of the parameters of a function
10274 (because the body is at least two levels down). */
10276 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
10277 by not allowing C++ class definitions to specify their parameters
10278 with xdecls (must be spec.d in the parmlist).
10280 Since we now wait to push a class scope until we are sure that
10281 we are in a legitimate method context, we must set oldcname
10282 explicitly (since current_class_name is not yet alive).
10284 We also want to avoid calling this a PARM if it is in a namespace. */
10287 {
10293 }
10299 {
10302 }
10305 {
10308 }
10310 /* If there were multiple types specified in the decl-specifier-seq,
10311 issue an error message. */
10313 {
10316 }
10319 {
10322 }
10324 /* Extract the basic type from the decl-specifier-seq. */
10327 {
10330 }
10331 /* If the entire declaration is itself tagged as deprecated then
10332 suppress reports of deprecated items. */
10337 {
10344 }
10345 /* No type at all: default to `int', and set DEFAULTED_INT
10346 because it was not a user-defined typedef. */
10348 {
10350 {
10351 /* These imply 'int'. */
10354 }
10355 /* If we just have "complex", it is equivalent to "complex double". */
10358 {
10361 "ISO C++ does not support plain %<complex%> meaning "
10363 }
10364 }
10365 /* Gather flags. */
10369 #if 0
10370 /* See the code below that used this. */
10373 #endif
10378 else
10382 {
10384 ctor_return_type,
10385 type_quals,
10388 }
10390 {
10395 /* We handle `main' specially here, because 'main () { }' is so
10396 common. With no options, it is allowed. With -Wreturn-type,
10397 it is a warning. It is only an error with -pedantic-errors. */
10398 is_main = (funcdef_flag
10414 else
10419 /* FIXME we should be able to propagate the error_mark_node as is
10420 for other contexts too. */
10422 else
10424 }
10429 {
10431 {
10435 }
10440 }
10442 /* Now process the modifiers that were specified
10443 and check for invalid combinations. */
10445 /* Long double is a special combination. */
10447 {
10451 }
10453 /* Check all other uses of type modifiers. */
10456 {
10478 {
10483 }
10484 else
10485 {
10488 {
10491 name);
10494 }
10495 }
10497 /* Discard the type modifiers if they are invalid. */
10499 {
10505 }
10506 }
10508 /* Decide whether an integer type is signed or not.
10509 Optionally treat bitfields as signed by default. */
10511 /* [class.bit]
10513 It is implementation-defined whether a plain (neither
10514 explicitly signed or unsigned) char, short, int, or long
10515 bit-field is signed or unsigned.
10517 Naturally, we extend this to long long as well. Note that
10518 this does not include wchar_t. */
10520 && !signed_p
10521 /* A typedef for plain `int' without `signed' can be
10522 controlled just like plain `int', but a typedef for
10523 `signed int' cannot be so controlled. */
10524 && !(typedef_decl
10528 {
10541 else
10543 }
10556 {
10559 /* If a modifier is specified, the resulting complex is the complex
10560 form of TYPE. E.g, "complex short" is "complex short int". */
10569 else
10571 }
10573 /* If we're using the injected-class-name to form a compound type or a
10574 declaration, replace it with the underlying class so we don't get
10575 redundant typedefs in the debug output. But if we are returning the
10576 type unchanged, leave it alone so that it's available to
10577 maybe_get_template_decl_from_type_decl. */
10585 type = cp_build_qualified_type_real
10589 /* We might have ignored or rejected some of the qualifiers. */
10596 {
10600 }
10612 {
10614 {
10619 }
10623 }
10626 /* Issue errors about use of storage classes for parameters. */
10628 {
10630 {
10633 }
10635 {
10638 }
10644 /* Function parameters cannot be concept. */
10647 /* Function parameters cannot be constexpr. If we saw one, moan
10648 and pretend it wasn't there. */
10650 {
10653 }
10654 }
10656 /* Give error if `virtual' is used outside of class declaration. */
10659 {
10663 }
10666 {
10681 declspecs->gnu_thread_keyword_p
10687 {
10712 }
10715 {
10717 {
10721 "type must be cv-qualified %<auto%> or reference to "
10723 }
10726 }
10736 }
10738 /* Static anonymous unions are dealt with here. */
10744 /* Warn about storage classes that are invalid for certain
10745 kinds of declarations (parameters, typenames, etc.). */
10747 && ((storage_class
10751 {
10754 }
10759 {
10763 ;
10765 ;
10767 /* C++ allows static class elements. */
10769 /* C++ also allows inlines and signed and unsigned elements,
10770 but in those cases we don't come in here. */
10771 ;
10772 else
10773 {
10776 else
10777 {
10780 else
10782 }
10788 }
10789 }
10794 {
10797 }
10801 {
10806 /* When thread_local is applied to a variable of block scope the
10807 storage-class-specifier static is implied if it does not appear
10808 explicitly. */
10811 }
10814 {
10818 }
10822 else
10823 {
10826 {
10839 }
10840 }
10843 {
10844 /* Apply the c++11 attributes to the type preceding them. */
10848 }
10850 /* Determine the type of the entity declared by recurring on the
10851 declarator. */
10853 {
10855 tree attrs;
10862 {
10874 attr_flags);
10875 }
10879 /* We don't want to warn in parameter context because we don't
10880 yet know if the parse will succeed, and this might turn out
10881 to be a constructor call. */
10885 /* If the type is class-like and the inner name used a
10886 global namespace qualifier, we need the parens.
10887 Unfortunately all we can tell is whether a qualified name
10888 was used or not. */
10889 && !(inner_declarator
10900 {
10908 /* [dcl.array]/1:
10910 The optional attribute-specifier-seq appertains to the
10911 array. */
10917 {
10918 tree arg_types;
10921 /* Declaring a function type. */
10927 /* Pick up type qualifiers which should be applied to `this'. */
10929 /* Pick up virt-specifiers. */
10931 /* And ref-qualifier, too */
10933 /* And tx-qualifier. */
10935 /* Pick up the exception specifications. */
10937 /* If the exception-specification is ill-formed, let's pretend
10938 there wasn't one. */
10946 /* Say it's a definition only for the CALL_EXPR
10947 closest to the identifier. */
10950 /* Handle a late-specified return type. */
10953 {
10955 {
10957 {
10962 {
10964 "%<auto%> type specifier without trailing "
10967 "only available with -std=c++14 or "
10969 }
10971 {
10975 }
10976 }
10978 {
10983 }
10985 {
10987 {
10990 "for %qT must have trailing return "
10992 else
10995 type);
10998 }
11004 else
11008 }
11009 }
11012 {
11014 /* Not using maybe_warn_cpp0x because this should
11015 always be an error. */
11018 else
11022 }
11023 }
11029 {
11032 }
11035 {
11039 /* We now know that the TYPE_QUALS don't apply to the
11040 decl, but to its return type. */
11042 }
11044 /* Error about some types functions can't return. */
11047 {
11051 }
11053 {
11057 }
11061 && funcdecl_p
11067 {
11068 /* We are within a class's scope. If our declarator name
11069 is the same as the class name, and we are defining
11070 a function, then it is a constructor/destructor, and
11071 therefore returns a void type. */
11073 /* ISO C++ 12.4/2. A destructor may not be declared
11074 const or volatile. A destructor may not be static.
11075 A destructor may not be declared with ref-qualifier.
11077 ISO C++ 12.1. A constructor may not be declared
11078 const or volatile. A constructor may not be
11079 virtual. A constructor may not be static.
11080 A constructor may not be declared with ref-qualifier. */
11086 {
11091 }
11094 {
11100 }
11104 current_class_type,
11105 flags))
11109 {
11110 /* It's a constructor. */
11114 {
11118 }
11122 }
11125 }
11127 {
11129 {
11130 /* Cannot be both friend and virtual. */
11133 }
11139 name);
11140 }
11142 {
11144 {
11147 }
11150 }
11152 {
11155 }
11164 {
11168 }
11174 {
11176 /* transaction_safe applies to the type, but
11177 transaction_safe_dynamic applies to the function. */
11180 else
11182 }
11184 /* [dcl.fct]/2:
11186 The optional attribute-specifier-seq appertains to
11187 the function type. */
11192 }
11198 /* Filter out pointers-to-references and references-to-references.
11199 We can get these if a TYPE_DECL is used. */
11202 {
11204 {
11207 }
11209 /* In C++0x, we allow reference to reference declarations
11210 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
11211 and template type arguments [14.3.1/4 temp.arg.type]. The
11212 check for direct reference to reference declarations, which
11213 are still forbidden, occurs below. Reasoning behind the change
11214 can be found in DR106, DR540, and the rvalue reference
11215 proposals. */
11217 {
11220 }
11221 }
11223 {
11228 }
11230 /* We now know that the TYPE_QUALS don't apply to the decl,
11231 but to the target of the pointer. */
11234 /* This code used to handle METHOD_TYPE, but I don't think it's
11235 possible to get it here anymore. */
11239 {
11243 memfn_quals,
11244 rqual);
11250 }
11258 type);
11260 /* When the pointed-to type involves components of variable size,
11261 care must be taken to ensure that the size evaluation code is
11262 emitted early enough to dominate all the possible later uses
11263 and late enough for the variables on which it depends to have
11264 been assigned.
11266 This is expected to happen automatically when the pointed-to
11267 type has a name/declaration of it's own, but special attention
11268 is required if the type is anonymous.
11270 We handle the NORMAL and FIELD contexts here by inserting a
11271 dummy statement that just evaluates the size at a safe point
11272 and ensures it is not deferred until e.g. within a deeper
11273 conditional context (c++/43555).
11275 We expect nothing to be needed here for PARM or TYPENAME.
11276 Evaluating the size at this point for TYPENAME would
11277 actually be incorrect, as we might be in the middle of an
11278 expression with side effects on the pointed-to type size
11279 "arguments" prior to the pointer declaration point and the
11280 size evaluation could end up prior to the side effects. */
11286 {
11290 }
11293 {
11294 /* In C++0x, the type we are creating a reference to might be
11295 a typedef which is itself a reference type. In that case,
11296 we follow the reference collapsing rules in
11297 [7.1.3/8 dcl.typedef] to create the final reference type:
11299 "If a typedef TD names a type that is a reference to a type
11300 T, an attempt to create the type 'lvalue reference to cv TD'
11301 creates the type 'lvalue reference to T,' while an attempt
11302 to create the type "rvalue reference to cv TD' creates the
11303 type TD."
11304 */
11308 {
11311 else
11313 }
11314 else
11315 type = cp_build_reference_type
11318 /* In C++0x, we need this check for direct reference to
11319 reference declarations, which are forbidden by
11320 [8.3.2/5 dcl.ref]. Reference to reference declarations
11321 are only allowed indirectly through typedefs and template
11322 type arguments. Example:
11324 void foo(int & &); // invalid ref-to-ref decl
11326 typedef int & int_ref;
11327 void foo(int_ref &); // valid ref-to-ref decl
11328 */
11332 }
11336 {
11340 /* We will already have complained. */
11342 else
11344 type);
11345 }
11346 else
11349 /* Process a list of type modifier keywords (such as
11350 const or volatile) that were given inside the `*' or `&'. */
11353 {
11354 type
11358 }
11360 /* Apply C++11 attributes to the pointer, and not to the
11361 type pointed to. This is unlike what is done for GNU
11362 attributes above. It is to comply with [dcl.ptr]/1:
11364 [the optional attribute-specifier-seq (7.6.1) appertains
11365 to the pointer and not to the object pointed to]. */
11378 }
11379 }
11381 /* A `constexpr' specifier used in an object declaration declares
11382 the object as `const'. */
11384 {
11385 /* DR1688 says that a `constexpr' specifier in combination with
11386 `volatile' is valid. */
11389 {
11392 }
11393 }
11399 {
11401 unqualified_id);
11403 }
11405 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
11406 qualified with a class-name, turn it into a METHOD_TYPE, unless
11407 we know that the function is static. We take advantage of this
11408 opportunity to do other processing that pertains to entities
11409 explicitly declared to be class members. Note that if DECLARATOR
11410 is non-NULL, we know it is a cdk_id declarator; otherwise, we
11411 would not have exited the loop above. */
11416 {
11422 {
11424 {
11428 }
11429 else
11433 }
11435 can skip the following checks. */
11438 qualifying type must certainly be complete. */
11439 funcdef_flag
11440 /* A friend declaration of "T::f" is OK, even if
11441 "T" is a template parameter. But, if this
11442 function is not a friend, the qualifying type
11443 must be a class. */
11445 /* For a declaration, the type need not be
11446 complete, if either it is dependent (since there
11447 is no meaningful definition of complete in that
11448 case) or the qualifying class is currently being
11449 defined. */
11452 /* Check that the qualifying type is complete. */
11456 {
11459 {
11467 }
11468 }
11470 {
11474 }
11475 }
11480 /* Now TYPE has the actual type. */
11483 {
11486 else
11488 }
11494 /* [dcl.meaning]/1: The optional attribute-specifier-seq following
11495 a declarator-id appertains to the entity that is declared. */
11498 /* Handle parameter packs. */
11500 {
11502 /* Turn the type into a pack expansion.*/
11504 else
11506 }
11509 && !processing_template_decl
11511 {
11514 else
11517 }
11520 {
11521 /* [dcl.fct.spec] (C++11) The explicit specifier shall be used only
11522 in the declaration of a constructor or conversion function within
11523 a class definition. */
11530 else
11532 "only declarations of constructors and conversion operators "
11535 }
11538 {
11540 {
11543 }
11545 {
11548 }
11551 {
11554 }
11556 {
11559 }
11561 {
11564 }
11566 {
11570 }
11571 }
11573 /* If this is declaring a typedef name, return a TYPE_DECL. */
11575 {
11576 tree decl;
11578 /* This declaration:
11580 typedef void f(int) const;
11582 declares a function type which is not a member of any
11583 particular class, but which is cv-qualified; for
11584 example "f S::*" declares a pointer to a const-qualified
11585 member function of S. We record the cv-qualification in the
11586 function type. */
11588 {
11591 /* We have now dealt with these qualifiers. */
11594 }
11597 {
11600 }
11607 else
11613 }
11616 {
11620 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
11622 /* The TYPE_DECL is "abstract" because there will be
11623 clones of this constructor/destructor, and there will
11624 be copies of this TYPE_DECL generated in those
11625 clones. The decloning optimization (for space) may
11626 revert this subsequently if it determines that
11627 the clones should share a common implementation. */
11629 }
11634 unqualified_id);
11636 /* If the user declares "typedef struct {...} foo" then the
11637 struct will have an anonymous name. Fill that name in now.
11638 Nothing can refer to it, so nothing needs know about the name
11639 change. */
11641 && unqualified_id
11659 /* Acknowledge that this was written:
11660 `using analias = atype;'. */
11664 }
11666 /* Detect the case of an array type of unspecified size
11667 which came, as such, direct from a typedef name.
11668 We must copy the type, so that the array's domain can be
11669 individually set by the object's initializer. */
11676 /* Detect where we're using a typedef of function type to declare a
11677 function. PARMS will not be set, so we must create it now. */
11680 {
11682 tree args;
11687 {
11693 }
11698 {
11699 /* The qualifiers on the function type become the qualifiers on
11700 the non-static member function. */
11704 }
11705 }
11707 /* If this is a type name (such as, in a cast or sizeof),
11708 compute the type and return it now. */
11711 {
11712 /* Note that here we don't care about type_quals. */
11714 /* Special case: "friend class foo" looks like a TYPENAME context. */
11716 {
11718 {
11721 }
11724 {
11725 /* Don't allow friend declaration without a class-key. */
11732 else
11735 type);
11736 }
11738 /* Only try to do this stuff if we didn't already give up. */
11740 {
11741 /* A friendly class? */
11745 else
11747 type);
11750 }
11751 }
11753 {
11760 /* Core issue #547: need to allow this in template type args.
11761 Allow it in general in C++11 for alias-declarations. */
11765 else
11767 }
11773 }
11777 && ! bitfield
11779 {
11782 }
11785 {
11786 /* Only functions may be declared using an operator-function-id. */
11788 {
11791 }
11796 type);
11797 }
11799 /* We don't check parameter types here because we can emit a better
11800 error message later. */
11802 {
11806 }
11808 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
11809 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
11812 {
11818 {
11821 else
11824 }
11826 /* A parameter declared as an array of T is really a pointer to T.
11827 One declared as a function is really a pointer to a function.
11828 One declared as a member is really a pointer to member. */
11831 {
11832 /* Transfer const-ness of array into that of type pointed to. */
11836 }
11839 }
11844 {
11850 }
11852 {
11856 {
11863 }
11865 {
11868 {
11874 else
11878 }
11880 /* The C99 flexible array extension. */
11883 {
11887 {
11890 }
11891 else
11892 {
11893 /* Array is a flexible member. */
11895 /* Do not warn on flexible array members in system
11900 else
11904 /* Flexible array member has a null domain. */
11906 }
11907 }
11910 {
11911 /* Happens when declaring arrays of sizes which
11912 are error_mark_node, for example. */
11914 }
11916 {
11917 /* Something like struct S { int N::j; }; */
11920 }
11923 {
11925 tree function_context;
11928 {
11929 /* This should never happen in pure C++ (the check
11930 could be an assert). It could happen in
11931 Objective-C++ if someone writes invalid code that
11932 uses a function declaration for an instance
11933 variable or property (instance variables and
11934 properties are parsed as FIELD_DECLs, but they are
11935 part of an Objective-C class, not a C++ class).
11936 That code is invalid and is caught by this
11937 check. */
11939 {
11941 unqualified_id);
11943 }
11945 /* ``A union may [ ... ] not [ have ] virtual functions.''
11946 ARM 9.5 */
11948 {
11950 unqualified_id);
11952 }
11957 {
11961 }
11962 }
11964 /* Check that the name used for a destructor makes sense. */
11966 {
11970 {
11975 }
11978 {
11982 }
11984 {
11987 }
11989 {
11992 }
11993 }
11995 {
12000 }
12003 {
12006 }
12008 {
12011 }
12014 {
12017 {
12023 }
12024 }
12026 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
12038 parms,
12039 unqualified_id,
12040 reqs,
12050 #if 0
12051 /* This clobbers the attrs stored in `decl' from `attrlist'. */
12052 /* The decl and setting of decl_attr is also turned off. */
12054 #endif
12056 /* [class.conv.ctor]
12058 A constructor declared without the function-specifier
12059 explicit that can be called with a single parameter
12060 specifies a conversion from the type of its first
12061 parameter to the type of its class. Such a constructor
12062 is called a converting constructor. */
12065 }
12070 {
12073 {
12075 {
12079 }
12080 else
12085 }
12086 }
12087 else
12088 {
12090 {
12094 }
12096 }
12099 {
12100 /* Friends are treated specially. */
12104 {
12106 {
12107 decl = check_explicit_specialization
12112 }
12116 funcdef_flag);
12118 }
12119 else
12121 }
12123 /* Structure field. It may not be a function, except for C++. */
12126 {
12128 {
12129 /* C++ allows static class members. All other work
12130 for this is done by grokfield. */
12138 unqualified_id);
12140 {
12144 }
12151 /* Even if there is an in-class initialization, DECL
12152 is considered undefined until an out-of-class
12153 definition is provided, unless this is an inline
12154 variable. */
12158 {
12164 }
12165 }
12166 else
12167 {
12170 unqualified_id);
12172 {
12174 unqualified_id);
12176 }
12181 {
12184 }
12187 {
12190 }
12193 {
12194 /* An attempt is being made to initialize a non-static
12195 member. This is new in C++11. */
12198 /* If this has been parsed with static storage class, but
12199 errors forced staticp to be cleared, ensure NSDMI is
12200 not present. */
12203 }
12204 }
12210 }
12211 }
12214 {
12215 tree original_name;
12223 else
12225 // FIXME:gcc_assert (original_name == dname);
12232 {
12235 name);
12236 else
12238 name);
12239 }
12243 /* Function declaration not at top level.
12244 Storage classes other than `extern' are not allowed
12245 and `extern' makes no difference. */
12250 {
12253 "%<static%> specifier invalid for function %qs "
12255 else
12257 "%<inline%> specifier invalid for function %qs "
12259 }
12262 {
12264 {
12267 }
12270 {
12275 }
12276 }
12278 /* Record whether the function is public. */
12288 publicp,
12291 sfk,
12292 funcdef_flag,
12301 {
12304 /* Don't allow a static member function in a class, and forbid
12305 declaring main to be static. */
12307 {
12311 }
12313 {
12314 /* 7.1.1: There can be no static function declarations within a
12315 block. */
12318 }
12321 {
12324 }
12325 }
12326 }
12327 else
12328 {
12329 /* It's a variable. */
12331 /* An uninitialized decl with `extern' is a reference. */
12333 declspecs,
12334 initialized,
12335 type_quals,
12336 inlinep,
12337 concept_p,
12338 template_count,
12348 {
12351 {
12356 }
12358 {
12361 }
12363 {
12365 "cannot explicitly declare member %q#D to have "
12368 }
12369 }
12371 {
12375 }
12380 {
12385 }
12386 }
12391 {
12395 }
12398 {
12400 {
12401 /* It's common practice (and completely valid) to have a const
12402 be initialized and declared extern. */
12405 }
12406 else
12407 {
12410 }
12411 }
12413 /* Record `register' declaration for warnings on &
12414 and in case doing stupid register allocation. */
12417 {
12419 /* Warn about register storage specifiers on PARM_DECLs. */
12421 {
12424 "ISO C++17 does not allow %<register%> storage "
12426 else
12429 }
12430 }
12436 /* Set constexpr flag on vars (functions got it in grokfndecl). */
12440 /* Record constancy and volatility on the DECL itself . There's
12441 no need to do this when processing a template; we'll do this
12442 for the instantiated declaration based on the type of DECL. */
12447 }
12448 }
12449 \f
12450 /* Subroutine of start_function. Ensure that each of the parameter
12451 types (as listed in PARMS) is complete, as is required for a
12452 function definition. */
12454 static void
12456 {
12458 {
12463 {
12469 }
12470 else
12471 /* grokparms or complete_type_or_else will have already issued
12472 an error. */
12474 }
12475 }
12477 /* Returns nonzero if T is a local variable. */
12479 int
12481 {
12483 /* A VAR_DECL with a context that is a _TYPE is a static data
12484 member. */
12486 /* Any other non-local variable must be at namespace scope. */
12492 }
12494 /* Like local_variable_p, but suitable for use as a tree-walking
12495 function. */
12497 static tree
12500 {
12508 }
12510 /* Check that ARG, which is a default-argument expression for a
12511 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
12512 something goes wrong. DECL may also be a _TYPE node, rather than a
12513 DECL, if there is no DECL available. */
12515 tree
12517 {
12518 tree var;
12519 tree decl_type;
12522 /* We get a DEFAULT_ARG when looking at an in-class declaration
12523 with a default argument. Ignore the argument for now; we'll
12524 deal with it after the class is complete. */
12528 {
12531 }
12532 else
12539 /* Something already went wrong. There's no need to check
12540 further. */
12543 /* [dcl.fct.default]
12545 A default argument expression is implicitly converted to the
12546 parameter type. */
12549 LOOKUP_IMPLICIT);
12552 /* Avoid redundant -Wzero-as-null-pointer-constant warnings at
12553 the call sites. */
12558 /* [dcl.fct.default]
12560 Local variables shall not be used in default argument
12561 expressions.
12563 The keyword `this' shall not be used in a default argument of a
12564 member function. */
12567 {
12569 {
12573 else
12575 }
12577 }
12579 /* All is well. */
12581 }
12583 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
12585 static tree
12587 {
12592 {
12595 else
12597 }
12599 /* Do warn about using typedefs to a deprecated class. */
12611 return type_is_deprecated
12615 }
12617 /* Decode the list of parameter types for a function type.
12618 Given the list of things declared inside the parens,
12619 return a list of types.
12621 If this parameter does not end with an ellipsis, we append
12622 void_list_node.
12624 *PARMS is set to the chain of PARM_DECLs created. */
12626 tree
12628 {
12631 tree parm;
12635 {
12648 {
12650 && !init
12653 /* DR 577: A parameter list consisting of a single
12654 unnamed parameter of non-dependent type 'void'. */
12658 "invalid use of cv-qualified type %qT in "
12660 else
12662 "invalid use of type %<void%> in parameter "
12664 /* It's not a good idea to actually create parameters of
12665 type `void'; other parts of the compiler assume that a
12666 void type terminates the parameter list. */
12669 }
12672 {
12674 {
12678 }
12680 /* Top-level qualifiers on the parameters are
12681 ignored for function types. */
12684 {
12688 }
12692 {
12693 /* Before C++17 DR 393:
12694 [dcl.fct]/6, parameter types cannot contain pointers
12695 (references) to arrays of unknown bound. */
12700 {
12708 }
12711 ptr
12717 }
12723 }
12728 }
12736 }
12738 \f
12739 /* D is a constructor or overloaded `operator='.
12741 Let T be the class in which D is declared. Then, this function
12742 returns:
12744 -1 if D's is an ill-formed constructor or copy assignment operator
12745 whose first parameter is of type `T'.
12746 0 if D is not a copy constructor or copy assignment
12747 operator.
12748 1 if D is a copy constructor or copy assignment operator whose
12749 first parameter is a reference to non-const qualified T.
12750 2 if D is a copy constructor or copy assignment operator whose
12751 first parameter is a reference to const qualified T.
12753 This function can be used as a predicate. Positive values indicate
12754 a copy constructor and nonzero values indicate a copy assignment
12755 operator. */
12757 int
12759 {
12760 tree args;
12761 tree arg_type;
12769 /* Instantiations of template member functions are never copy
12770 functions. Note that member functions of templated classes are
12771 represented as template functions internally, and we must
12772 accept those as copy functions. */
12784 {
12785 /* Pass by value copy assignment operator. */
12787 }
12791 {
12794 }
12795 else
12801 /* There are more non-optional args. */
12805 }
12807 /* D is a constructor or overloaded `operator='.
12809 Let T be the class in which D is declared. Then, this function
12810 returns true when D is a move constructor or move assignment
12811 operator, false otherwise. */
12813 bool
12815 {
12819 /* There are no move constructors if we are in C++98 mode. */
12825 /* Instantiations of template member functions are never move
12826 functions. Note that member functions of templated classes are
12827 represented as template functions internally, and we must
12828 accept those as move functions. */
12832 }
12834 /* D is a constructor or overloaded `operator='.
12836 Then, this function returns true when D has the same signature as a move
12837 constructor or move assignment operator (because either it is such a
12838 ctor/op= or it is a template specialization with the same signature),
12839 false otherwise. */
12841 bool
12843 {
12844 tree args;
12845 tree arg_type;
12865 /* There are more non-optional args. */
12869 }
12871 /* Remember any special properties of member function DECL. */
12873 void
12875 {
12876 tree class_type;
12883 {
12890 {
12891 /* [class.copy]
12893 A non-template constructor for class X is a copy
12894 constructor if its first parameter is of type X&, const
12895 X&, volatile X& or const volatile X&, and either there
12896 are no other parameters or else all other parameters have
12897 default arguments. */
12903 }
12914 }
12916 {
12917 /* [class.copy]
12919 A non-template assignment operator for class X is a copy
12920 assignment operator if its parameter is of type X, X&, const
12921 X&, volatile X& or const volatile X&. */
12926 {
12932 }
12935 }
12939 /* Destructors are handled in check_methods. */
12940 }
12942 /* Check a constructor DECL has the correct form. Complains
12943 if the class has a constructor of the form X(X). */
12945 bool
12947 {
12951 {
12952 /* [class.copy]
12954 A declaration of a constructor for a class X is ill-formed if
12955 its first parameter is of type (optionally cv-qualified) X
12956 and either there are no other parameters or else all other
12957 parameters have default arguments.
12959 We *don't* complain about member template instantiations that
12960 have this form, though; they can occur as we try to decide
12961 what constructor to use during overload resolution. Since
12962 overload resolution will never prefer such a constructor to
12963 the non-template copy constructor (which is either explicitly
12964 or implicitly defined), there's no need to worry about their
12965 existence. Theoretically, they should never even be
12966 instantiated, but that's hard to forestall. */
12970 }
12973 }
12975 /* DECL is a declaration for an overloaded or conversion operator. If
12976 COMPLAIN is true, errors are issued for invalid declarations. */
12978 bool
12980 {
12989 tree_code operator_code;
12992 {
12993 /* Conversion operators are TYPE_EXPR for the purposes of this
12994 function. */
12997 }
12998 else
12999 {
13006 }
13009 {
13010 /* operator new and operator delete are quite special. */
13013 {
13032 }
13034 /* [basic.std.dynamic.allocation]/1:
13036 A program is ill-formed if an allocation function is declared
13037 in a namespace scope other than global scope or declared
13038 static in global scope.
13040 The same also holds true for deallocation functions. */
13042 {
13044 {
13047 }
13050 {
13053 }
13054 }
13058 else
13059 {
13062 }
13065 }
13067 /* An operator function must either be a non-static member function
13068 or have at least one parameter of a class, a reference to a class,
13069 an enumeration, or a reference to an enumeration. 13.4.0.6 */
13071 {
13077 {
13080 }
13083 {
13087 }
13090 {
13092 {
13097 }
13103 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
13104 because these checks are performed even on template
13105 functions. */
13109 }
13110 }
13113 /* There are no further restrictions on the arguments to an overloaded
13114 "operator ()". */
13118 {
13119 /* 13.4.0.3 */
13122 }
13124 /* Count the number of arguments and check for ellipsis. */
13127 {
13129 {
13130 /* Variadic. */
13133 }
13135 }
13137 /* Verify correct number of arguments. */
13139 {
13142 {
13143 /* We have a unary instance of an ambi-ary op. Remap to the
13144 unary one. */
13150 }
13152 {
13153 /* This was an ambiguous operator but is invalid. */
13158 }
13161 && ! processing_template_decl
13162 /* x++ and x--'s second argument must be an int. */
13164 integer_type_node))
13165 {
13169 decl);
13171 }
13176 {
13181 }
13186 {
13191 }
13196 }
13198 /* There can be no default arguments. */
13201 {
13207 else
13208 {
13211 }
13212 }
13214 /* At this point the declaration is well-formed. It may not be
13215 sensible though. */
13217 /* Check member function warnings only on the in-class declaration.
13218 There's no point warning on an out-of-class definition. */
13222 /* Warn about conversion operators that will never be used. */
13226 {
13235 ref
13241 {
13244 ref
13249 /* Don't force t to be complete here. */
13254 ref
13259 }
13260 }
13265 /* Effective C++ rules below. */
13267 /* More Effective C++ rule 7. */
13274 /* More Effective C++ rule 6. */
13279 {
13288 {
13293 }
13294 else
13295 {
13298 }
13299 }
13301 /* Effective C++ rule 23. */
13312 }
13313 \f
13314 /* Return a string giving the keyword associate with CODE. */
13318 {
13320 {
13333 }
13334 }
13336 /* Name lookup in an elaborated-type-specifier (after the keyword
13337 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
13338 elaborated-type-specifier is invalid, issue a diagnostic and return
13339 error_mark_node; otherwise, return the *_TYPE to which it referred.
13340 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
13342 tree
13344 tree decl,
13346 {
13347 tree type;
13349 /* In the case of:
13351 struct S { struct S *p; };
13353 name lookup will find the TYPE_DECL for the implicit "S::S"
13354 typedef. Adjust for that here. */
13360 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
13361 is false for this case as well. */
13363 {
13367 }
13368 /* Accept template template parameters. */
13372 ;
13373 /* [dcl.type.elab]
13375 If the identifier resolves to a typedef-name or the
13376 simple-template-id resolves to an alias template
13377 specialization, the elaborated-type-specifier is ill-formed.
13379 In other words, the only legitimate declaration to use in the
13380 elaborated type specifier is the implicit typedef created when
13381 the type is declared. */
13385 {
13389 else
13394 }
13399 {
13403 }
13406 {
13410 }
13414 {
13415 /* If a class template appears as elaborated type specifier
13416 without a template header such as:
13418 template <class T> class C {};
13419 void f(class C); // No template header here
13421 then the required template argument is missing. */
13426 }
13429 }
13431 /* Lookup NAME in elaborate type specifier in scope according to
13432 SCOPE and issue diagnostics if necessary.
13433 Return *_TYPE node upon success, NULL_TREE when the NAME is not
13434 found, and ERROR_MARK_NODE for type error. */
13436 static tree
13439 {
13440 tree t;
13441 tree decl;
13443 {
13444 /* First try ordinary name lookup, ignoring hidden class name
13445 injected via friend declaration. */
13448 /* If that fails, the name will be placed in the smallest
13449 non-class, non-function-prototype scope according to 3.3.1/5.
13450 We may already have a hidden name declared as friend in this
13451 scope. So lookup again but not ignoring hidden names.
13452 If we find one, that name will be made visible rather than
13453 creating a new tag. */
13456 }
13457 else
13462 /* If scope is ts_current we're defining a class, so ignore a
13463 template template parameter. */
13469 {
13470 /* Look for invalid nested type:
13471 class C {
13472 class C {};
13473 }; */
13475 {
13478 decl);
13480 }
13482 /* Two cases we need to consider when deciding if a class
13483 template is allowed as an elaborated type specifier:
13484 1. It is a self reference to its own class.
13485 2. It comes with a template header.
13487 For example:
13489 template <class T> class C {
13490 class C *c1; // DECL_SELF_REFERENCE_P is true
13491 class D;
13492 };
13493 template <class U> class C; // template_header_p is true
13494 template <class T> class C<T>::D {
13495 class C *c2; // DECL_SELF_REFERENCE_P is true
13496 }; */
13499 decl,
13500 template_header_p
13505 {
13514 }
13517 }
13519 {
13523 }
13524 else
13526 }
13528 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
13529 Define the tag as a forward-reference if it is not defined.
13531 If a declaration is given, process it here, and report an error if
13532 multiple declarations are not identical.
13534 SCOPE is TS_CURRENT when this is also a definition. Only look in
13535 the current frame for the name (since C++ allows new names in any
13536 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
13537 declaration. Only look beginning from the current scope outward up
13538 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
13540 TEMPLATE_HEADER_P is true when this declaration is preceded by
13541 a set of template parameters. */
13543 static tree
13546 {
13553 {
13566 }
13568 /* In case of anonymous name, xref_tag is only called to
13569 make type node and push name. Name lookup is not required. */
13580 {
13584 /* Since SCOPE is not TS_CURRENT, we are not looking at a
13585 definition of this tag. Since, in addition, we are currently
13586 processing a (member) template declaration of a template
13587 class, we must be very careful; consider:
13589 template <class X> struct S1
13591 template <class U> struct S2
13592 {
13593 template <class V> friend struct S1;
13594 };
13596 Here, the S2::S1 declaration should not be confused with the
13597 outer declaration. In particular, the inner version should
13598 have a template parameter of level 2, not level 1.
13600 On the other hand, when presented with:
13602 template <class T> struct S1
13603 {
13604 template <class U> struct S2 {};
13605 template <class U> friend struct S2;
13606 };
13608 the friend must find S1::S2 eventually. We accomplish this
13609 by making sure that the new type we create to represent this
13610 declaration has the right TYPE_CONTEXT. */
13613 }
13616 {
13617 /* If no such tag is yet defined, create a forward-reference node
13618 and record it as the "definition".
13619 When a real declaration of this type is found,
13620 the forward-reference will be altered into a real type. */
13622 {
13625 }
13626 else
13627 {
13631 {
13632 /* Mark it as a lambda type. */
13634 /* And push it into current scope. */
13636 }
13638 }
13639 }
13640 else
13641 {
13643 {
13644 /* Check that we aren't trying to overload a class with different
13645 constraints. */
13648 {
13651 }
13654 }
13658 {
13662 }
13665 {
13666 /* This is no longer an invisible friend. Make it
13667 visible. */
13674 {
13678 }
13679 }
13680 }
13683 }
13685 /* Wrapper for xref_tag_1. */
13687 tree
13690 {
13691 tree ret;
13697 }
13700 tree
13702 {
13707 else
13714 }
13716 /* Create the binfo hierarchy for REF with (possibly NULL) base list
13717 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
13718 access_* node, and the TREE_VALUE is the type of the base-class.
13719 Non-NULL TREE_TYPE indicates virtual inheritance. */
13721 void
13723 {
13730 tree default_access;
13736 /* The base of a derived class is private by default, all others are
13737 public. */
13742 /* First, make sure that any templates in base-classes are
13743 instantiated. This ensures that if we call ourselves recursively
13744 we do not get confused about which classes are marked and which
13745 are not. */
13748 {
13751 /* The dependent_type_p call below should really be dependent_scope_p
13752 so that we give a hard error about using an incomplete type as a
13753 base, but we allow it with a pedwarn for backward
13754 compatibility. */
13760 /* An incomplete type. Remove it from the list. */
13762 else
13763 {
13764 max_bases++;
13766 max_dvbases++;
13770 }
13771 }
13776 /* The binfo slot should be empty, unless this is an (ill-formed)
13777 redefinition. */
13788 /* Apply base-class info set up to the variants of this type. */
13792 {
13794 /* A C++98 POD cannot have base classes. */
13799 }
13806 {
13807 /* An aggregate can't have virtual base classes. */
13815 }
13818 {
13826 /* Before C++17, an aggregate cannot have base classes. In C++17, an
13827 aggregate can't have virtual, private, or protected base classes. */
13838 {
13840 basetype);
13842 }
13846 {
13848 /* The original basetype could have been a typedef'd type. */
13851 /* Inherit flags from the base. */
13862 }
13864 /* We must do this test after we've seen through a typedef
13865 type. */
13867 {
13870 else
13873 }
13876 /* Regenerate the pack expansion for the bases. */
13890 dropped_base:
13891 /* Update max_vbases to reflect the reality that we are dropping
13892 this base: if it reaches zero we want to undo the vec_alloc
13893 above to avoid inconsistencies during error-recovery: eg, in
13894 build_special_member_call, CLASSTYPE_VBASECLASSES non null
13895 and vtt null (c++/27952). */
13897 max_vbases--;
13899 max_vbases
13901 }
13908 /* If we didn't get max_vbases vbases, we must have shared at
13909 least one of them, and are therefore diamond shaped. */
13912 /* Unmark all the types. */
13917 /* Now see if we have a repeated base type. */
13919 {
13922 {
13924 {
13927 }
13929 }
13934 else
13936 }
13937 }
13939 \f
13940 /* Copies the enum-related properties from type SRC to type DST.
13941 Used with the underlying type of an enum and the enum itself. */
13942 static void
13944 {
13945 tree t;
13947 {
13957 else
13961 }
13962 }
13964 /* Begin compiling the definition of an enumeration type.
13965 NAME is its name,
13967 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
13969 UNDERLYING_TYPE is the type that will be used as the storage for
13970 the enumeration type. This should be NULL_TREE if no storage type
13971 was specified.
13973 ATTRIBUTES are any attributes specified after the enum-key.
13975 SCOPED_ENUM_P is true if this is a scoped enumeration type.
13977 if IS_NEW is not NULL, gets TRUE iff a new type is created.
13979 Returns the type object, as yet incomplete.
13980 Also records info about it so that build_enumerator
13981 may be used to declare the individual values as they are read. */
13983 tree
13986 {
13992 /* [C++0x dcl.enum]p5:
13994 If not explicitly specified, the underlying type of a scoped
13995 enumeration type is int. */
14002 /* If this is the real definition for a previous forward reference,
14003 fill in the contents in the same object that used to be the
14004 forward reference. */
14010 /* In case of a template_decl, the only check that should be deferred
14011 to instantiation time is the comparison of underlying types. */
14013 {
14015 {
14021 }
14023 {
14029 }
14035 {
14041 }
14042 }
14046 {
14047 /* In case of error, make a dummy enum to allow parsing to
14048 continue. */
14050 {
14053 }
14055 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
14056 of an opaque enum, or an opaque enum of an already defined
14057 enumeration (C++0x only).
14058 In any other case, it'll be NULL_TREE. */
14060 {
14063 }
14066 /* Do not push the decl more than once, unless we need to
14067 compare underlying types at instantiation time */
14070 || (underlying_type
14074 {
14078 /* std::byte aliases anything. */
14083 }
14084 else
14091 /* The enum is considered opaque until the opening '{' of the
14092 enumerator list. */
14095 }
14102 {
14104 /* We already checked that it matches, don't change it to a different
14107 {
14110 }
14113 else
14116 }
14118 /* If into a template class, the returned enum is always the first
14119 declaration (opaque or not) seen. This way all the references to
14120 this type will be to the same declaration. The following ones are used
14121 only to check for definition errors. */
14124 else
14126 }
14128 /* After processing and defining all the values of an enumeration type,
14129 install their decls in the enumeration type.
14130 ENUMTYPE is the type object. */
14132 void
14134 {
14135 tree values;
14136 tree underlying_type;
14137 tree decl;
14138 tree value;
14140 tree t;
14142 bool fixed_underlying_type_p
14145 /* We built up the VALUES in reverse order. */
14148 /* For an enum defined in a template, just set the type of the values;
14149 all further processing is postponed until the template is
14150 instantiated. We need to set the type so that tsubst of a CONST_DECL
14151 works. */
14153 {
14155 values;
14159 }
14161 /* Determine the minimum and maximum values of the enumerators. */
14163 {
14167 values;
14169 {
14172 /* [dcl.enum]: Following the closing brace of an enum-specifier,
14173 each enumerator has the type of its enumeration. Prior to the
14174 closing brace, the type of each enumerator is the type of its
14175 initializing value. */
14178 /* Update the minimum and maximum values, if appropriate. */
14182 /* Figure out what the minimum and maximum values of the
14183 enumerators are. */
14190 }
14191 }
14192 else
14193 /* [dcl.enum]
14195 If the enumerator-list is empty, the underlying type is as if
14196 the enumeration had a single enumerator with value 0. */
14200 {
14201 /* Compute the number of bits require to represent all values of the
14202 enumeration. We must do this before the type of MINNODE and
14203 MAXNODE are transformed, since tree_int_cst_min_precision relies
14204 on the TREE_TYPE of the value it is passed. */
14212 /* Determine the underlying type of the enumeration.
14214 [dcl.enum]
14216 The underlying type of an enumeration is an integral type that
14217 can represent all the enumerator values defined in the
14218 enumeration. It is implementation-defined which integral type is
14219 used as the underlying type for an enumeration except that the
14220 underlying type shall not be larger than int unless the value of
14221 an enumerator cannot fit in an int or unsigned int.
14223 We use "int" or an "unsigned int" as the underlying type, even if
14224 a smaller integral type would work, unless the user has
14225 explicitly requested that we use the smallest possible type. The
14226 user can request that for all enumerations with a command line
14227 flag, or for just one enumeration with an attribute. */
14229 use_short_enum = flag_short_enums
14232 /* If the precision of the type was specified with an attribute and it
14233 was too small, give an error. Otherwise, use it. */
14235 {
14238 else
14239 {
14242 }
14243 }
14247 itk++)
14248 {
14254 }
14256 {
14257 /* DR 377
14259 IF no integral type can represent all the enumerator values, the
14260 enumeration is ill-formed. */
14265 }
14267 /* [dcl.enum]
14269 The value of sizeof() applied to an enumeration type, an object
14270 of an enumeration type, or an enumerator, is the value of sizeof()
14271 applied to the underlying type. */
14274 /* Compute the minimum and maximum values for the type.
14276 [dcl.enum]
14278 For an enumeration where emin is the smallest enumerator and emax
14279 is the largest, the values of the enumeration are the values of the
14280 underlying type in the range bmin to bmax, where bmin and bmax are,
14281 respectively, the smallest and largest values of the smallest bit-
14282 field that can store emin and emax. */
14284 /* The middle-end currently assumes that types with TYPE_PRECISION
14285 narrower than their underlying type are suitably zero or sign
14286 extended to fill their mode. Similarly, it assumes that the front
14287 end assures that a value of a particular type must be within
14288 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
14290 We used to set these fields based on bmin and bmax, but that led
14291 to invalid assumptions like optimizing away bounds checking. So
14292 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
14293 TYPE_MAX_VALUE to the values for the mode above and only restrict
14294 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
14298 set_min_and_max_values_for_integral_type
14301 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
14304 }
14305 else
14308 /* Convert each of the enumerators to the type of the underlying
14309 type of the enumeration. */
14311 {
14312 location_t saved_location;
14318 /* If the enumeration type has a fixed underlying type, we
14319 already checked all of the enumerator values. */
14321 else
14324 tf_warning_or_error);
14327 /* Do not clobber shared ints. */
14329 {
14333 }
14335 }
14337 /* Fix up all variant types of this enum type. */
14344 {
14346 /* TYPE_FIELDS needs fixup. */
14348 }
14350 /* Finish debugging output for this type. */
14353 /* Each enumerator now has the type of its enumeration. Clear the cache
14354 so that this change in types doesn't confuse us later on. */
14356 }
14358 /* Finishes the enum type. This is called only the first time an
14359 enumeration is seen, be it opaque or odinary.
14360 ENUMTYPE is the type object. */
14362 void
14364 {
14366 {
14370 }
14372 /* If this is a forward declaration, there should not be any variants,
14373 though we can get a variant in the middle of an enum-specifier with
14374 wacky code like 'enum E { e = sizeof(const E*) };' */
14378 }
14380 /* Build and install a CONST_DECL for an enumeration constant of the
14381 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
14382 Apply ATTRIBUTES if available. LOC is the location of NAME.
14383 Assignment of sequential values by default is handled here. */
14385 void
14387 location_t loc)
14388 {
14389 tree decl;
14390 tree context;
14391 tree type;
14393 /* scalar_constant_value will pull out this expression, so make sure
14394 it's folded as appropriate. */
14398 /* If the VALUE was erroneous, pretend it wasn't there; that will
14399 result in the enum being assigned the next value in sequence. */
14403 /* Remove no-op casts from the value. */
14408 {
14409 /* Validate and default VALUE. */
14411 {
14413 {
14418 }
14421 value = perform_implicit_conversion_flags
14429 {
14432 {
14436 }
14437 else
14438 {
14442 {
14446 }
14447 }
14448 }
14449 }
14451 /* Default based on previous value. */
14453 {
14455 {
14456 tree prev_value;
14459 /* C++03 7.2/4: If no initializer is specified for the first
14460 enumerator, the type is an unspecified integral
14461 type. Otherwise the type is the same as the type of the
14462 initializing value of the preceding enumerator unless the
14463 incremented value is not representable in that type, in
14464 which case the type is an unspecified integral type
14465 sufficient to contain the incremented value. */
14469 else
14470 {
14476 {
14479 {
14482 {
14488 }
14495 }
14498 else
14500 }
14503 {
14506 }
14507 }
14508 }
14509 else
14511 }
14513 /* Remove no-op casts from the value. */
14516 /* If the underlying type of the enum is fixed, check whether
14517 the enumerator values fits in the underlying type. If it
14518 does not fit, the program is ill-formed [C++0x dcl.enum]. */
14520 && value
14522 {
14527 /* Convert the value to the appropriate type. */
14529 }
14530 }
14532 /* C++ associates enums with global, function, or class declarations. */
14535 /* Build the actual enumeration constant. Note that the enumeration
14536 constants have the underlying type of the enum (if it is fixed)
14537 or the type of their initializer (if the underlying type of the
14538 enum is not fixed):
14540 [ C++0x dcl.enum ]
14542 If the underlying type is fixed, the type of each enumerator
14543 prior to the closing brace is the underlying type; if the
14544 initializing value of an enumerator cannot be represented by
14545 the underlying type, the program is ill-formed. If the
14546 underlying type is not fixed, the type of each enumerator is
14547 the type of its initializing value.
14549 If the underlying type is not fixed, it will be computed by
14550 finish_enum and we will reset the type of this enumerator. Of
14551 course, if we're processing a template, there may be no value. */
14565 {
14566 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
14567 on the TYPE_FIELDS list for `S'. (That's so that you can say
14568 things like `S::i' later.) */
14570 /* The enumerator may be getting declared outside of its enclosing
14571 class, like so:
14573 class S { public: enum E : int; }; enum S::E : int { i = 7; };
14575 For which case we need to make sure that the access of `S::i'
14576 matches the access of `S::E'. */
14582 else
14588 }
14589 else
14592 /* Add this enumeration constant to the list for this type. */
14594 }
14596 /* Look for an enumerator with the given NAME within the enumeration
14597 type ENUMTYPE. This routine is used primarily for qualified name
14598 lookup into an enumerator in C++0x, e.g.,
14600 enum class Color { Red, Green, Blue };
14602 Color color = Color::Red;
14604 Returns the value corresponding to the enumerator, or
14605 NULL_TREE if no such enumerator was found. */
14606 tree
14608 {
14609 tree e;
14614 }
14616 \f
14617 /* We're defining DECL. Make sure that its type is OK. */
14619 static void
14621 {
14625 /* In a function definition, arg types must be complete. */
14632 {
14637 /* Make it return void instead. */
14640 void_type_node,
14642 else
14644 fntype
14647 fntype = (cp_build_type_attribute_variant
14650 }
14651 else
14652 {
14656 }
14657 }
14659 /* True iff FN is an implicitly-defined default constructor. */
14661 static bool
14663 {
14667 }
14669 /* Clobber the contents of *this to let the back end know that the object
14670 storage is dead when we enter the constructor or leave the destructor. */
14672 static tree
14674 {
14675 /* Clobbering an empty base is pointless, and harmful if its one byte
14676 TYPE_SIZE overlays real data. */
14680 /* If we have virtual bases, clobber the whole object, but only if we're in
14681 charge. If we don't have virtual bases, clobber the as-base type so we
14682 don't mess with tail padding. */
14694 {
14697 }
14704 }
14706 /* Create the FUNCTION_DECL for a function definition.
14707 DECLSPECS and DECLARATOR are the parts of the declaration;
14708 they describe the function's name and the type it returns,
14709 but twisted together in a fashion that parallels the syntax of C.
14711 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
14712 DECLARATOR is really the DECL for the function we are about to
14713 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
14714 indicating that the function is an inline defined in-class.
14716 This function creates a binding context for the function body
14717 as well as setting up the FUNCTION_DECL in current_function_decl.
14719 For C++, we must first check whether that datum makes any sense.
14720 For example, "class A local_a(1,2);" means that variable local_a
14721 is an aggregate of type A, which should have a constructor
14722 applied to it with the argument list [1, 2].
14724 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
14725 or may be a BLOCK if the function has been defined previously
14726 in this translation unit. On exit, DECL_INITIAL (decl1) will be
14727 error_mark_node if the function has never been defined, or
14728 a BLOCK if the function has been defined somewhere. */
14730 bool
14732 {
14734 tree fntype;
14735 tree restype;
14738 tree current_function_parms;
14743 /* Sanity check. */
14751 /* ISO C++ 11.4/5. A friend function defined in a class is in
14752 the (lexical) scope of the class in which it is defined. */
14754 {
14757 /* CTYPE could be null here if we're dealing with a template;
14758 for example, `inline friend float foo()' inside a template
14759 will have no CTYPE set. */
14762 else
14764 }
14771 /* Handle gnu_inline attribute. */
14773 {
14778 }
14781 /* This is a constructor, we must ensure that any default args
14782 introduced by this definition are propagated to the clones
14783 now. The clones are used directly in overload resolution. */
14786 /* Sometimes we don't notice that a function is a static member, and
14787 build a METHOD_TYPE for it. Fix that up now. */
14791 /* Set up current_class_type, and enter the scope of the class, if
14792 appropriate. */
14798 /* Now that we have entered the scope of the class, we must restore
14799 the bindings for any template parameters surrounding DECL1, if it
14800 is an inline member template. (Order is important; consider the
14801 case where a template parameter has the same name as a field of
14802 the class.) It is not until after this point that
14803 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
14807 /* Effective C++ rule 15. */
14815 /* Make the init_value nonzero so pushdecl knows this is not tentative.
14816 error_mark_node is replaced below (in poplevel) with the BLOCK. */
14820 /* This function exists in static storage.
14821 (This does not mean `static' in the C sense!) */
14824 /* We must call push_template_decl after current_class_type is set
14825 up. (If we are processing inline definitions after exiting a
14826 class scope, current_class_type will be NULL_TREE until set above
14827 by push_nested_class.) */
14829 {
14832 {
14836 }
14838 }
14840 /* Make sure the parameter and return types are reasonable. When
14841 you declare a function, these types can be incomplete, but they
14842 must be complete when you define the function. */
14845 /* Build the return declaration for the function. */
14849 {
14850 tree resdecl;
14858 }
14860 /* Record the decl so that the function name is defined.
14861 If we already have a decl for this name, and it is a FUNCTION_DECL,
14862 use the old decl. */
14864 {
14865 /* A specialization is not used to guide overload resolution. */
14869 {
14873 /* If something went wrong when registering the declaration,
14874 use DECL1; we have to have a FUNCTION_DECL to use when
14875 parsing the body of the function. */
14876 ;
14877 else
14878 {
14879 /* Otherwise, OLDDECL is either a previous declaration
14880 of the same function or DECL1 itself. */
14887 {
14888 tree context;
14890 /* Check whether DECL1 is in an anonymous
14891 namespace. */
14893 context;
14895 {
14899 }
14903 OPT_Wmissing_declarations,
14905 }
14908 }
14909 }
14910 else
14911 {
14912 /* We need to set the DECL_CONTEXT. */
14915 }
14919 /* If #pragma weak applies, mark the decl appropriately now.
14920 The pragma only applies to global functions. Because
14921 determining whether or not the #pragma applies involves
14922 computing the mangled name for the declaration, we cannot
14923 apply the pragma until after we have merged this declaration
14924 with any previous declarations; if the original declaration
14925 has a linkage specification, that specification applies to
14926 the definition as well, and may affect the mangled name. */
14929 }
14931 /* We are now in the scope of the function being defined. */
14934 /* Save the parm names or decls from this function's declarator
14935 where store_parm_decls will find them. */
14938 /* Let the user know we're compiling this function. */
14943 /* This function may already have been parsed, in which case just
14944 return; our caller will skip over the body without parsing. */
14948 /* Initialize RTL machinery. We cannot do this until
14949 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
14950 even when processing a template; this is how we get
14951 CFUN set up, and our per-function variables initialized.
14952 FIXME factor out the non-RTL stuff. */
14956 /* Initialize the language data structures. Whenever we start
14957 a new function, we destroy temporaries in the usual way. */
14963 {
14966 }
14968 /* Start the statement-tree, start the tree now. */
14971 /* If we are (erroneously) defining a function that we have already
14972 defined before, wipe out what we knew before. */
14977 {
14978 /* We know that this was set up by `grokclassfn'. We do not
14979 wait until `store_parm_decls', since evil parse errors may
14980 never get us to that point. Here we keep the consistency
14981 between `current_class_type' and `current_class_ptr'. */
14987 cp_function_chain->x_current_class_ref
14989 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
14992 /* Constructors and destructors need to know whether they're "in
14993 charge" of initializing virtual base classes. */
14996 {
14999 }
15001 {
15004 }
15005 }
15008 /* Implicitly-defined methods (like the
15009 destructor for a class in which no destructor
15010 is explicitly declared) must not be defined
15011 until their definition is needed. So, we
15012 ignore interface specifications for
15013 compiler-generated functions. */
15019 {
15026 /* This is a function in a local class in an extern inline
15027 or template function. */
15029 }
15030 /* If this function belongs to an interface, it is public.
15031 If it belongs to someone else's interface, it is also external.
15032 This only affects inlines and template instantiations. */
15034 {
15037 {
15041 && ! flag_implement_inlines
15044 /* For WIN32 we also want to put these in linkonce sections. */
15046 }
15047 else
15050 /* If this function is in an interface implemented in this file,
15051 make sure that the back end knows to emit this function
15052 here. */
15055 }
15058 {
15059 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
15060 interface, we will have both finfo->interface_unknown and
15061 finfo->interface_only set. In that case, we don't want to
15062 use the normal heuristics because someone will supply a
15063 #pragma implementation elsewhere, and deducing it here would
15064 produce a conflict. */
15069 }
15070 else
15071 {
15072 /* This is a definition, not a reference.
15073 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
15081 else
15083 }
15085 /* Determine the ELF visibility attribute for the function. We must not
15086 do this before calling "pushdecl", as we must allow "duplicate_decls"
15087 to merge any attributes appropriately. We also need to wait until
15088 linkage is set. */
15102 {
15105 }
15115 /* Clobbering an empty base is harmful if it overlays real data. */
15117 /* We can't clobber safely for an implicitly-defined default constructor
15118 because part of the initialization might happen before we enter the
15119 constructor, via AGGR_INIT_ZERO_FIRST (c++/68006). */
15133 }
15136 /* Like start_preparsed_function, except that instead of a
15137 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
15139 Returns true on success. If the DECLARATOR is not suitable
15140 for a function, we return false, which tells the parser to
15141 skip the entire function. */
15143 bool
15146 tree attrs)
15147 {
15148 tree decl1;
15154 /* If the declarator is not suitable for a function definition,
15155 cause a syntax error. */
15157 {
15160 }
15163 /* main must return int. grokfndecl should have corrected it
15164 (and issued a diagnostic) if the user got it wrong. */
15166 integer_type_node));
15169 }
15170 \f
15171 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
15172 FN. */
15174 static bool
15176 {
15178 && !processing_template_decl
15180 /* We insert the EH_SPEC_BLOCK only in the original
15181 function; then, it is copied automatically to the
15182 clones. */
15184 /* Implicitly-generated constructors and destructors have
15185 exception specifications. However, those specifications
15186 are the union of the possible exceptions specified by the
15187 constructors/destructors for bases and members, so no
15188 unallowed exception will ever reach this function. By
15189 not creating the EH_SPEC_BLOCK we save a little memory,
15190 and we avoid spurious warnings about unreachable
15191 code. */
15193 }
15195 /* Store the parameter declarations into the current function declaration.
15196 This is called after parsing the parameter declarations, before
15197 digesting the body of the function.
15199 Also install to binding contour return value identifier, if any. */
15201 static void
15203 {
15205 tree parm;
15207 /* This is a chain of any other decls that came in among the parm
15208 declarations. If a parm is declared with enum {foo, bar} x;
15209 then CONST_DECLs for foo and bar are put here. */
15213 {
15214 /* This case is when the function was defined with an ANSI prototype.
15215 The parms already have decls, so we need not do anything here
15216 except record them as in effect
15217 and complain if any redundant old-style parm decls were written. */
15220 tree next;
15222 /* Must clear this because it might contain TYPE_DECLs declared
15223 at class level. */
15226 /* If we're doing semantic analysis, then we'll call pushdecl
15227 for each of these. We must do them in reverse order so that
15228 they end in the correct forward order. */
15232 {
15236 else
15237 {
15238 /* If we find an enum constant or a type tag,
15239 put it aside for the moment. */
15242 }
15243 }
15245 /* Get the decls in their original chain order and record in the
15246 function. This is all and only the PARM_DECLs that were
15247 pushed into scope by the loop above. */
15249 }
15250 else
15253 /* Now store the final chain of decls for the arguments
15254 as the decl-chain of the current lexical scope.
15255 Put the enumerators in as well, at the front so that
15256 DECL_ARGUMENTS is not modified. */
15261 }
15263 \f
15264 /* We have finished doing semantic analysis on DECL, but have not yet
15265 generated RTL for its body. Save away our current state, so that
15266 when we want to generate RTL later we know what to do. */
15268 static void
15270 {
15273 /* Save the language-specific per-function data so that we can
15274 get it back when we really expand this function. */
15277 /* Make a copy. */
15282 /* Clear out the bits we don't need. */
15287 }
15290 /* Set the return value of the constructor (if present). */
15292 static void
15294 {
15295 tree val;
15296 tree exprstmt;
15299 {
15300 /* Any return from a constructor will end up here. */
15306 /* Return the address of the object. */
15309 }
15310 }
15312 /* Do all the processing for the beginning of a destructor; set up the
15313 vtable pointers and cleanups for bases and members. */
15315 static void
15317 {
15318 tree compound_stmt;
15320 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
15321 issued an error message. We still want to try to process the
15322 body of the function, but initialize_vtbl_ptrs will crash if
15323 TYPE_BINFO is NULL. */
15325 {
15327 /* Make all virtual function table pointers in non-virtual base
15328 classes point to CURRENT_CLASS_TYPE's virtual function
15329 tables. */
15334 /* Clobbering an empty base is harmful if it overlays real data. */
15336 {
15340 {
15342 tree ref
15349 tf_warning_or_error);
15351 }
15352 else
15354 }
15356 /* And insert cleanups for our bases and members so that they
15357 will be properly destroyed if we throw. */
15359 }
15360 }
15362 /* At the end of every destructor we generate code to delete the object if
15363 necessary. Do that now. */
15365 static void
15367 {
15368 tree exprstmt;
15370 /* Any return from a destructor will end up here; that way all base
15371 and member cleanups will be run when the function returns. */
15375 {
15376 tree val;
15381 /* Return the address of the object. */
15384 }
15385 }
15387 /* Do the necessary processing for the beginning of a function body, which
15388 in this case includes member-initializers, but not the catch clauses of
15389 a function-try-block. Currently, this means opening a binding level
15390 for the member-initializers (in a ctor), member cleanups (in a dtor),
15391 and capture proxies (in a lambda operator()). */
15393 tree
15395 {
15396 tree stmt;
15403 else
15404 /* Always keep the BLOCK node associated with the outermost pair of
15405 curly braces of a function. These are needed for correct
15406 operation of dwarfout.c. */
15417 }
15419 /* Do the processing for the end of a function body. Currently, this means
15420 closing out the cleanups for fully-constructed bases and members, and in
15421 the case of the destructor, deleting the object if desired. Again, this
15422 is only meaningful for [cd]tors, since they are the only functions where
15423 there is a significant distinction between the main body and any
15424 function catch clauses. Handling, say, main() return semantics here
15425 would be wrong, as flowing off the end of a function catch clause for
15426 main() would also need to return 0. */
15428 void
15430 {
15434 /* Close the block. */
15443 }
15445 /* Given a function, returns the BLOCK corresponding to the outermost level
15446 of curly braces, skipping the artificial block created for constructor
15447 initializers. */
15449 tree
15451 {
15461 }
15463 /* If FNDECL is a class's key method, add the class to the list of
15464 keyed classes that should be emitted. */
15466 static void
15468 {
15472 {
15476 }
15477 }
15479 /* Subroutine of finish_function.
15480 Save the body of constexpr functions for possible
15481 future compile time evaluation. */
15483 static void
15485 {
15491 }
15493 /* Finish up a function declaration and compile that function
15494 all the way to assembler language output. The free the storage
15495 for the function definition. INLINE_P is TRUE if we just
15496 finished processing the body of an in-class inline function
15497 definition. (This processing will have taken place after the
15498 class definition is complete.) */
15500 tree
15502 {
15506 /* When we get some parse errors, we can end up without a
15507 current_function_decl, so cope. */
15520 /* TREE_READONLY (fndecl) = 1;
15521 This caused &foo to be of type ptr-to-const-function
15522 which then got a warning when stored in a ptr-to-function variable. */
15525 /* The current function is being defined, so its DECL_INITIAL should
15526 be set, and unless there's a multiple definition, it should be
15527 error_mark_node. */
15530 /* For a cloned function, we've already got all the code we need;
15531 there's no need to add any extra bits. */
15533 {
15534 /* Make it so that `main' always returns 0 by default. */
15541 current_eh_spec_block);
15542 }
15544 /* If we're saving up tree structure, tie off the function now. */
15549 /* If this function can't throw any exceptions, remember that. */
15552 && !flag_non_call_exceptions
15556 /* This must come after expand_function_end because cleanups might
15557 have declarations (from inline functions) that need to go into
15558 this function's blocks. */
15560 /* If the current binding level isn't the outermost binding level
15561 for this function, either there is a bug, or we have experienced
15562 syntax errors and the statement tree is malformed. */
15564 {
15565 /* Make sure we have already experienced errors. */
15568 /* Throw away the broken statement tree and extra binding
15569 levels. */
15573 {
15576 else
15578 }
15579 }
15582 /* Statements should always be full-expressions at the outermost set
15583 of curly braces for a function. */
15586 /* If there are no return statements in a function with auto return type,
15587 the return type is void. But if the declared type is something like
15588 auto*, this is an error. */
15591 {
15593 {
15596 }
15599 {
15601 current_function_auto_return_pattern);
15604 }
15605 }
15607 // If this is a concept, check that the definition is reasonable.
15611 /* Lambda closure members are implicitly constexpr if possible. */
15615 = ((processing_template_decl
15619 /* Save constexpr function body before it gets munged by
15620 the NRV transformation. */
15623 /* Invoke the pre-genericize plugin before we start munging things. */
15627 /* Perform delayed folding before NRV transformation. */
15631 /* Set up the named return value optimization, if we can. Candidate
15632 variables are selected in check_return_expr. */
15634 {
15636 tree outer;
15639 /* This is only worth doing for fns that return in memory--and
15640 simpler, since we don't have to worry about promoted modes. */
15642 /* Only allow this for variables declared in the outer scope of
15643 the function so we know that their lifetime always ends with a
15644 return; see g++.dg/opt/nrv6.C. We could be more flexible if
15645 we were to do this optimization in tree-ssa. */
15651 }
15653 /* Remember that we were in class scope. */
15657 /* Must mark the RESULT_DECL as being in this function. */
15660 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
15661 to the FUNCTION_DECL node itself. */
15664 /* Save away current state, if appropriate. */
15668 /* Complain if there's just no return statement. */
15673 /* Don't complain if we abort or throw. */
15674 && !current_function_returns_abnormally
15675 /* Don't complain if there's an infinite loop. */
15676 && !current_function_infinite_loop
15677 /* Don't complain if we are declared noreturn. */
15681 /* Structor return values (if any) are set by the compiler. */
15685 {
15689 }
15691 /* Store the end of the function, so that we get good line number
15692 info for the epilogue. */
15695 /* Complain about parameters that are only set, but never otherwise used. */
15697 && !processing_template_decl
15700 {
15701 tree decl;
15704 decl;
15718 OPT_Wunused_but_set_parameter,
15721 }
15723 /* Complain about locally defined typedefs that are not used in this
15724 function. */
15727 /* Possibly warn about unused parameters. */
15729 && !processing_template_decl
15733 /* Genericize before inlining. */
15735 {
15738 /* Clear out the bits we don't need. */
15748 }
15749 /* Clear out the bits we don't need. */
15752 /* We're leaving the context of this function, so zap cfun. It's still in
15753 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
15757 /* If this is an in-class inline definition, we may have to pop the
15758 bindings for the template parameters that we added in
15759 maybe_begin_member_template_processing when start_function was
15760 called. */
15764 /* Leave the scope of the class. */
15770 /* Clean up. */
15775 }
15776 \f
15777 /* Create the FUNCTION_DECL for a function definition.
15778 DECLSPECS and DECLARATOR are the parts of the declaration;
15779 they describe the return type and the name of the function,
15780 but twisted together in a fashion that parallels the syntax of C.
15782 This function creates a binding context for the function body
15783 as well as setting up the FUNCTION_DECL in current_function_decl.
15785 Returns a FUNCTION_DECL on success.
15787 If the DECLARATOR is not suitable for a function (it defines a datum
15788 instead), we return 0, which tells yyparse to report a parse error.
15790 May return void_type_node indicating that this method is actually
15791 a friend. See grokfield for more details.
15793 Came here with a `.pushlevel' .
15795 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
15796 CHANGES TO CODE IN `grokfield'. */
15798 tree
15801 {
15809 {
15812 }
15817 /* Pass friends other than inline friend functions back. */
15822 {
15827 }
15836 /* We process method specializations in finish_struct_1. */
15838 {
15842 }
15845 {
15847 {
15850 }
15851 }
15857 }
15858 \f
15860 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
15861 we can lay it out later, when and if its type becomes complete.
15863 Also handle constexpr variables where the initializer involves
15864 an unlowered PTRMEM_CST because the class isn't complete yet. */
15866 void
15868 {
15871 /* Keep track of variables with incomplete types. */
15874 {
15882 /* RTTI TD entries are created while defining the type_info. */
15885 {
15888 }
15892 {
15893 /* When the outermost open class is complete we can resolve any
15894 pointers-to-members. */
15898 }
15899 }
15900 }
15902 /* Called when a class type (given by TYPE) is defined. If there are
15903 any existing VAR_DECLs whose type has been completed by this
15904 declaration, update them now. */
15906 void
15908 {
15913 {
15915 {
15922 {
15923 /* Complete the type of the variable. The VAR_DECL itself
15924 will be laid out in expand_expr. */
15927 }
15929 /* Remove this entry from the list. */
15931 }
15932 else
15933 ix++;
15934 }
15936 /* Check for pending declarations which may have abstract type. */
15938 }
15940 /* If DECL is of a type which needs a cleanup, build and return an
15941 expression to perform that cleanup here. Return NULL_TREE if no
15942 cleanup need be done. DECL can also be a _REF when called from
15943 split_nonconstant_init_1. */
15945 tree
15947 {
15948 tree type;
15949 tree attr;
15950 tree cleanup;
15952 /* Assume no cleanup is required. */
15958 /* Handle "__attribute__((cleanup))". We run the cleanup function
15959 before the destructor since the destructor is what actually
15960 terminates the lifetime of the object. */
15963 else
15966 {
15967 tree id;
15968 tree fn;
15969 tree arg;
15971 /* Get the name specified by the user for the cleanup function. */
15973 /* Look up the name to find the cleanup function to call. It is
15974 important to use lookup_name here because that is what is
15975 used in c-common.c:handle_cleanup_attribute when performing
15976 initial checks on the attribute. Note that those checks
15977 include ensuring that the function found is not an overloaded
15978 function, or an object with an overloaded call operator,
15979 etc.; we can rely on the fact that the function found is an
15980 ordinary FUNCTION_DECL. */
15988 }
15989 /* Handle ordinary C++ destructors. */
15992 {
15994 tree addr;
15995 tree call;
15999 else
16010 else
16012 }
16014 /* build_delete sets the location of the destructor call to the
16015 current location, even though the destructor is going to be
16016 called later, at the end of the current scope. This can lead to
16017 a "jumpy" behavior for users of debuggers when they step around
16018 the end of the block. So let's unset the location of the
16019 destructor call instead. */
16025 /* Treat objects with destructors as used; the destructor may do
16026 something substantive. */
16031 }
16033 \f
16034 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
16035 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
16036 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
16038 tree
16040 {
16041 tree fntype;
16042 tree args;
16056 fntype = (cp_build_type_attribute_variant
16058 fntype = (build_exception_variant
16063 }
16065 /* DECL was originally constructed as a non-static member function,
16066 but turned out to be static. Update it accordingly. */
16068 void
16070 {
16083 }
16085 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
16086 one of the language-independent trees. */
16088 enum cp_tree_node_structure_enum
16090 {
16092 {
16109 }
16110 }
16112 /* Build the void_list_node (void_type_node having been created). */
16113 tree
16115 {
16118 }
16120 bool
16122 {
16123 /* A missing noreturn is ok for the `main' function. */
16125 }
16127 /* Return the decl used to identify the COMDAT group into which DECL should
16128 be placed. */
16130 tree
16132 {
16133 /* Virtual tables, construction virtual tables, and virtual table
16134 tables all go in a single COMDAT group, named after the primary
16135 virtual table. */
16138 /* For all other DECLs, the COMDAT group is the mangled name of the
16139 declaration itself. */
16140 else
16141 {
16143 {
16144 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
16145 into the same section as the target function. In that case
16146 we must return target's name. */
16152 else
16154 }
16155 }
16158 }
16160 /* Returns the return type for FN as written by the user, which may include
16161 a placeholder for a deduced return type. */
16163 tree
16165 {
16168 {
16175 }
16177 }
16179 /* Returns true iff DECL was declared with an auto type and it has
16180 not yet been deduced to a real type. */
16182 bool
16184 {
16188 }
16190 /* Complain if DECL has an undeduced return type. */
16192 bool
16194 {
16196 {
16200 }
16202 }