| blob | 44a152bd1956c0c77fd3c1c893b1a62abeadd3dd |
1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988-2018 Free Software Foundation, Inc.
3 Contributed by Michael Tiemann (tiemann@cygnus.com)
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
10 any later version.
12 GCC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
22 /* Process declarations and symbol lookup for C++ front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
55 /* Possible cases of bad specifiers type used by bad_specifiers. */
60 BSP_FIELD /* field */
61 };
96 static tree check_special_function_return_type
104 /* The following symbols are subsumed in the cp_global_trees array, and
105 listed here individually for documentation purposes.
107 C++ extensions
108 tree wchar_decl_node;
110 tree vtable_entry_type;
111 tree delta_type_node;
112 tree __t_desc_type_node;
114 tree class_type_node;
115 tree unknown_type_node;
117 Array type `vtable_entry_type[]'
119 tree vtbl_type_node;
120 tree vtbl_ptr_type_node;
122 Namespaces,
124 tree std_node;
125 tree abi_node;
127 A FUNCTION_DECL which can call `abort'. Not necessarily the
128 one that the user will declare, but sufficient to be called
129 by routines that want to abort the program.
131 tree abort_fndecl;
133 Used by RTTI
134 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
135 tree tinfo_var_id; */
139 #define local_names cp_function_chain->x_local_names
141 /* A list of objects which have constructors or destructors
142 which reside in the global scope. The decl is stored in
143 the TREE_VALUE slot and the initializer is stored
144 in the TREE_PURPOSE slot. */
145 tree static_aggregates;
147 /* Like static_aggregates, but for thread_local variables. */
148 tree tls_aggregates;
150 /* -- end of C++ */
152 /* A node for the integer constant 2. */
154 tree integer_two_node;
156 /* vector of static decls. */
159 /* vector of keyed classes. */
162 /* Used only for jumps to as-yet undefined labels, since jumps to
163 defined labels can have their validity checked immediately. */
167 /* The binding level to which this entry is *currently* attached.
168 This is initially the binding level in which the goto appeared,
169 but is modified as scopes are closed. */
171 /* The head of the names list that was current when the goto appeared,
172 or the inner scope popped. These are the decls that will *not* be
173 skipped when jumping to the label. */
174 tree names_in_scope;
175 /* The location of the goto, for error reporting. */
176 location_t o_goto_locus;
177 /* True if an OpenMP structured block scope has been closed since
178 the goto appeared. This means that the branch from the label will
179 illegally exit an OpenMP scope. */
181 };
183 /* A list of all LABEL_DECLs in the function that have names. Here so
184 we can clear out their names' definitions at the end of the
185 function, and so we can check the validity of jumps to these labels. */
195 /* The binding level to which the label is *currently* attached.
196 This is initially set to the binding level in which the label
197 is defined, but is modified as scopes are closed. */
200 /* The head of the names list that was current when the label was
201 defined, or the inner scope popped. These are the decls that will
202 be skipped when jumping to the label. */
203 tree names_in_scope;
205 /* A vector of all decls from all binding levels that would be
206 crossed by a backward branch to the label. */
209 /* A list of uses of the label, before the label is defined. */
212 /* The following bits are set after the label is defined, and are
213 updated as scopes are popped. They indicate that a jump to the
214 label will illegally enter a scope of the given flavor. */
220 };
222 #define named_labels cp_function_chain->x_named_labels
223 \f
224 /* The number of function bodies which we are currently processing.
225 (Zero if we are at namespace scope, one inside the body of a
226 function, two inside the body of a function in a local class, etc.) */
229 /* Whether the exception-specifier is part of a function type (i.e. C++17). */
232 /* States indicating how grokdeclarator() should handle declspecs marked
233 with __attribute__((deprecated)). An object declared as
234 __attribute__((deprecated)) suppresses warnings of uses of other
235 deprecated items. */
238 \f
239 /* A list of VAR_DECLs whose type was incomplete at the time the
240 variable was declared. */
243 tree decl;
244 tree incomplete_type;
245 };
249 \f
250 /* Returns the kind of template specialization we are currently
251 processing, given that it's declaration contained N_CLASS_SCOPES
252 explicit scope qualifications. */
254 tmpl_spec_kind
256 {
262 /* Scan through the template parameter scopes. */
266 {
267 /* If we see a specialization scope inside a parameter scope,
268 then something is wrong. That corresponds to a declaration
269 like:
271 template <class T> template <> ...
273 which is always invalid since [temp.expl.spec] forbids the
274 specialization of a class member template if the enclosing
275 class templates are not explicitly specialized as well. */
277 {
280 else
282 }
287 }
289 /* Handle explicit instantiations. */
291 {
293 /* We've seen a template parameter list during an explicit
294 instantiation. For example:
296 template <class T> template void f(int);
298 This is erroneous. */
300 else
302 }
305 /* We've not seen enough template headers to match all the
306 specialized classes present. For example:
308 template <class T> void R<T>::S<T>::f(int);
310 This is invalid; there needs to be one set of template
311 parameters for each class. */
314 /* We're processing a non-template declaration (even though it may
315 be a member of a template class.) For example:
317 template <class T> void S<T>::f(int);
319 The `class T' matches the `S<T>', leaving no template headers
320 corresponding to the `f'. */
323 /* We've got too many template headers. For example:
325 template <> template <class T> void f (T);
327 There need to be more enclosing classes. */
329 else
330 /* This must be a template. It's of the form:
332 template <class T> template <class U> void S<T>::f(U);
334 This is a specialization if the innermost level was a
335 specialization; otherwise it's just a definition of the
336 template. */
338 }
340 /* Exit the current scope. */
342 void
344 {
346 }
348 /* When a label goes out of scope, check to see if that label was used
349 in a valid manner, and issue any appropriate warnings or errors. */
351 static void
353 {
355 {
357 {
358 location_t location;
362 /* FIXME want (LOCATION_FILE (input_location), (line)0) */
363 /* Avoid crashing later. */
365 }
366 else
368 }
369 }
371 /* Helper function to sort named label entries in a vector by DECL_UID. */
373 static int
375 {
379 /* DECL_UIDs can never be equal. */
381 }
383 /* At the end of a function, all labels declared within the function
384 go out of scope. BLOCK is the top-level block for the
385 function. */
387 static void
389 {
393 /* We need to add the labels to the block chain, so debug
394 information is emitted. But, we want the order to be stable so
395 need to sort them first. Otherwise the debug output could be
396 randomly ordered. I guess it's mostly stable, unless the hash
397 table implementation changes. */
402 {
409 }
414 {
421 }
422 }
424 /* At the end of a block with local labels, restore the outer definition. */
426 static void
428 {
436 else
437 {
440 }
442 }
444 /* The following two routines are used to interface to Objective-C++.
445 The binding level is purposely treated as an opaque type. */
449 {
451 }
453 /* The following routine is used by the NeXT-style SJLJ exceptions;
454 variables get marked 'volatile' so as to not be clobbered by
455 _setjmp()/_longjmp() calls. All variables in the current scope,
456 as well as parent scopes up to (but not including) ENCLOSING_BLK
457 shall be thusly marked. */
459 void
461 {
467 {
468 tree decl;
473 /* Do not climb up past the current function. */
476 }
477 }
479 /* True if B is the level for the condition of a constexpr if. */
481 static bool
483 {
487 }
489 /* Update data for defined and undefined labels when leaving a scope. */
491 int
493 {
498 {
499 tree decl;
501 /* ENT->NAMES_IN_SCOPE may contain a mixture of DECLs and
502 TREE_LISTs representing OVERLOADs, so be careful. */
512 {
531 }
532 }
534 {
539 {
544 }
545 }
548 }
550 /* Saved errorcount to avoid -Wunused-but-set-{parameter,variable} warnings
551 when errors were reported, except for -Werror-unused-but-set-*. */
554 /* Exit a binding level.
555 Pop the level off, and restore the state of the identifier-decl mappings
556 that were in effect when this level was entered.
558 If KEEP == 1, this level had explicit declarations, so
559 and create a "block" (a BLOCK node) for the level
560 to record its declarations and subblocks for symbol table output.
562 If FUNCTIONBODY is nonzero, this level is the body of a function,
563 so create a block as if KEEP were set and also clear out all
564 label names.
566 If REVERSE is nonzero, reverse the order of decls before putting
567 them into the BLOCK. */
569 tree
571 {
572 tree link;
573 /* The chain of decls was accumulated in reverse order.
574 Put it into forward order, just for cleanliness. */
575 tree decls;
576 tree subblocks;
577 tree block;
578 tree decl;
580 scope_kind kind;
584 restart:
597 /* We used to use KEEP == 2 to indicate that the new block should go
598 at the beginning of the list of blocks at this binding level,
599 rather than the end. This hack is no longer used. */
605 /* Any uses of undefined labels, and any defined labels, now operate
606 under constraints of next binding contour. */
611 /* Get the decls in the order they were written.
612 Usually current_binding_level->names is in reverse order.
613 But parameter decls were previously put in forward order. */
617 {
620 }
622 /* If there were any declarations or structure tags in that level,
623 or if this level is a function body,
624 create a BLOCK to record them for the life of this function. */
626 /* Avoid function body block if possible. */
632 {
635 }
637 /* In each subblock, record that this is its superior. */
642 /* We still support the old for-scope rules, whereby the variables
643 in a init statement were in scope after the for-statement ended.
644 We only use the new rules if flag_new_for_scope is nonzero. */
645 leaving_for_scope
648 /* Before we remove the declarations first check for unused variables. */
653 {
654 /* There are cases where D itself is a TREE_LIST. See in
655 push_local_binding where the list of decls returned by
656 getdecls is built. */
663 /* For structured bindings, consider only real variables, not
664 subobjects. */
672 {
674 {
677 OPT_Wunused_variable,
679 else
682 }
684 // For -Wunused-but-set-variable leave references alone.
687 {
692 else
694 OPT_Wunused_but_set_variable,
697 }
698 }
699 }
701 /* Remove declarations for all the DECLs in this level. */
703 {
708 /* It's hard to make this ARM compatibility hack play nicely with
709 lambdas, and it really isn't necessary in C++11 mode. */
712 {
721 /* We have something like:
723 int i;
724 for (int i; ;);
726 and we are leaving the `for' scope. There's no reason to
727 keep the binding of the inner `i' in this case. */
728 ;
731 /* Here, we have something like:
733 typedef int I;
735 void f () {
736 for (int I; ;);
737 }
739 We must pop the for-scope binding so we know what's a
740 type and what isn't. */
741 ;
742 else
743 {
744 /* Mark this VAR_DECL as dead so that we can tell we left it
745 there only for backward compatibility. */
748 /* Keep track of what should have happened when we
749 popped the binding. */
751 {
754 }
756 /* Add it to the list of dead variables in the next
757 outermost binding to that we can remove these when we
758 leave that binding. */
761 link);
763 /* Although we don't pop the cxx_binding, we do clear
764 its SCOPE since the scope is going away now. */
768 /* Don't remove the binding. */
770 }
771 }
772 /* Remove the binding. */
775 else
777 }
779 /* Remove declarations for any `for' variables from inner scopes
780 that we kept around. */
785 /* Restore the IDENTIFIER_TYPE_VALUEs. */
790 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
791 list if a `using' declaration put them there. The debugging
792 back ends won't understand OVERLOAD, so we remove them here.
793 Because the BLOCK_VARS are (temporarily) shared with
794 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
795 popped all the bindings. Also remove undeduced 'auto' decls,
796 which LTO doesn't understand, and can't have been used by anything. */
798 {
802 {
804 || (!processing_template_decl
807 else
809 }
810 }
812 /* If the level being exited is the top level of a function,
813 check over all the labels. */
815 {
817 {
818 /* Since this is the top level block of a function, the vars are
819 the function's parameters. Don't leave them in the BLOCK
820 because they are found in the FUNCTION_DECL instead. */
823 }
824 else
826 }
830 {
831 tree stmt;
833 /* If this is a temporary binding created for a cleanup, then we'll
834 have pushed a statement list level. Pop that, create a new
835 BIND_EXPR for the block, and insert it into the stream. */
839 }
843 {
844 /* The current function is being defined, so its DECL_INITIAL
845 should be error_mark_node. */
849 {
851 {
854 }
855 else
857 }
858 }
860 current_binding_level->blocks
863 /* If we did not make a block for the level just exited,
864 any blocks made for inner levels
865 (since they cannot be recorded as subblocks in that level)
866 must be carried forward so they will later become subblocks
867 of something else. */
869 current_binding_level->blocks
872 /* Each and every BLOCK node created here in `poplevel' is important
873 (e.g. for proper debugging information) so if we created one
874 earlier, mark it as "used". */
878 /* All temporary bindings created for cleanups are popped silently. */
884 }
886 /* Call wrapup_globals_declarations for the globals in NAMESPACE. */
887 /* Diagnose odr-used extern inline variables without definitions
888 in the current TU. */
890 int
892 {
894 {
895 tree decl;
898 {
908 OPT_Wunused_function,
917 }
919 /* Clear out the list, so we don't rescan next time. */
922 /* Write out any globals that need to be output. */
925 }
927 }
928 \f
929 /* In C++, you don't have to write `struct S' to refer to `S'; you
930 can just use `S'. We accomplish this by creating a TYPE_DECL as
931 if the user had written `typedef struct S S'. Create and return
932 the TYPE_DECL for TYPE. */
934 tree
936 {
937 tree decl;
941 /* There are other implicit type declarations, like the one *within*
942 a class that allows you to write `S::S'. We must distinguish
943 amongst these. */
949 }
951 /* Remember a local name for name-mangling purposes. */
953 static void
955 {
965 {
968 {
973 else
979 }
980 }
984 }
985 \f
986 /* Subroutine of duplicate_decls: return truthvalue of whether
987 or not types of these decls match.
989 For C++, we must compare the parameter list so that `int' can match
990 `int&' in a parameter position, but `int&' is not confused with
991 `const int&'. */
993 int
995 {
1002 /* If the two DECLs are not even the same kind of thing, we're not
1003 interested in their types. */
1009 {
1014 tree r2;
1016 /* Specializations of different templates are different functions
1017 even if they have the same type. */
1032 /* A new declaration doesn't match a built-in one unless it
1033 is also extern "C". */
1041 /* A declaration with deduced return type should use its pre-deduction
1042 type for declaration matching. */
1046 {
1049 #ifndef NO_IMPLICIT_EXTERN_C
1052 #endif
1053 ))
1054 {
1058 }
1059 #ifndef NO_IMPLICIT_EXTERN_C
1067 {
1070 }
1071 #endif
1072 else
1073 types_match =
1079 }
1080 else
1083 /* The decls dont match if they correspond to two different versions
1084 of the same function. Disallow extern "C" functions to be
1085 versions for now. */
1089 && record_versions
1094 }
1096 {
1110 else
1111 // We don't need to check equivalently_constrained for variable and
1112 // function templates because we check it on the results.
1114 }
1115 else
1116 {
1117 /* Need to check scope for variable declaration (VAR_DECL).
1118 For typedef (TYPE_DECL), scope is ignored. */
1121 /* [dcl.link]
1122 Two declarations for an object with C language linkage
1123 with the same name (ignoring the namespace that qualify
1124 it) that appear in different namespace scopes refer to
1125 the same object. */
1135 else
1138 COMPARE_REDECLARATION);
1139 }
1141 // Normal functions can be constrained, as can variable partial
1142 // specializations.
1147 }
1149 /* NEWDECL and OLDDECL have identical signatures. If they are
1150 different versions adjust them and return true.
1151 If RECORD is set to true, record function versions. */
1153 bool
1155 {
1160 {
1164 }
1167 {
1171 }
1177 }
1179 /* If NEWDECL is `static' and an `extern' was seen previously,
1180 warn about it. OLDDECL is the previous declaration.
1182 Note that this does not apply to the C++ case of declaring
1183 a variable `extern const' and then later `const'.
1185 Don't complain about built-in functions, since they are beyond
1186 the user's control. */
1188 void
1190 {
1197 /* Don't get confused by static member functions; that's a different
1198 use of `static'. */
1203 /* If the old declaration was `static', or the new one isn't, then
1204 everything is OK. */
1208 /* It's OK to declare a builtin function as `static'. */
1217 }
1219 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1220 function templates. If their exception specifications do not
1221 match, issue a diagnostic. */
1223 static void
1225 tree old_decl)
1226 {
1230 /* Two default specs are equivalent, don't force evaluation. */
1240 /* [except.spec]
1242 If any declaration of a function has an exception-specification,
1243 all declarations, including the definition and an explicit
1244 specialization, of that function shall have an
1245 exception-specification with the same set of type-ids. */
1248 {
1256 /* We used to silently permit mismatched eh specs with
1257 -fno-exceptions, so make them a pedwarn now. */
1259 else
1264 }
1265 }
1267 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1268 Otherwise issue diagnostics. */
1270 static bool
1272 {
1282 {
1284 {
1285 /* Hide a built-in declaration. */
1289 }
1290 /* 7.1.5 [dcl.constexpr]
1291 Note: An explicit specialization can differ from the template
1292 declaration with respect to the constexpr specifier. */
1298 "redeclaration %qD differs in %<constexpr%> "
1303 }
1305 }
1307 // If OLDDECL and NEWDECL are concept declarations with the same type
1308 // (i.e., and template parameters), but different requirements,
1309 // emit diagnostics and return true. Otherwise, return false.
1312 {
1324 {
1329 {
1332 }
1333 }
1335 }
1337 /* DECL is a redeclaration of a function or function template. If
1338 it does have default arguments issue a diagnostic. Note: this
1339 function is used to enforce the requirements in C++11 8.3.6 about
1340 no default arguments in redeclarations. */
1342 static void
1344 {
1350 {
1352 "redeclaration of %q#D may not have default "
1355 }
1356 }
1358 /* Merge tree bits that correspond to attributes noreturn, nothrow,
1359 const, malloc, and pure from NEWDECL with those of OLDDECL. */
1361 static void
1363 {
1376 }
1378 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1380 DECL_ATTRIBUTES (fn)))
1382 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1383 If the redeclaration is invalid, a diagnostic is issued, and the
1384 error_mark_node is returned. Otherwise, OLDDECL is returned.
1386 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1387 returned.
1389 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1391 tree
1393 {
1397 tree new_template_info;
1404 /* If either the type of the new decl or the type of the old decl is an
1405 error_mark_node, then that implies that we have already issued an
1406 error (earlier) for some bogus type specification, and in that case,
1407 it is rather pointless to harass the user with yet more error message
1408 about the same declaration, so just pretend the types match here. */
1417 {
1428 }
1430 /* True to merge attributes between the declarations, false to
1431 set OLDDECL's attributes to those of NEWDECL (for template
1432 explicit specializations that specify their own attributes
1433 independent of those specified for the primary template). */
1441 && merge_attr
1443 {
1447 else
1450 }
1452 /* Check for redeclaration and other discrepancies. */
1455 {
1458 {
1459 /* Avoid warnings redeclaring built-ins which have not been
1460 explicitly declared. */
1462 {
1466 OPT_Wbuiltin_declaration_mismatch,
1468 newdecl);
1470 }
1472 /* If you declare a built-in or predefined function name as static,
1473 the old definition is overridden, but optionally warn this was a
1474 bad choice of name. */
1476 {
1481 /* Discard the old built-in function. */
1483 }
1484 /* If the built-in is not ansi, then programs can override
1485 it even globally without an error. */
1490 else
1494 }
1496 {
1503 }
1505 {
1506 /* Avoid warnings redeclaring built-ins which have not been
1507 explicitly declared. */
1509 {
1512 /* A new declaration doesn't match a built-in one unless it
1513 is also extern "C". */
1523 {
1526 /* FILE, tm types are not known at the time
1527 we create the builtins. */
1533 {
1540 {
1548 newdecl_is_friend);
1550 }
1552 }
1556 next_arg:;
1557 }
1560 OPT_Wbuiltin_declaration_mismatch,
1561 "declaration of %q#D conflicts with built-in "
1563 }
1568 {
1569 /* Don't really override olddecl for __* prefixed builtins
1570 except for __[^b]*_chk, the compiler might be using those
1571 explicitly. */
1573 {
1585 {
1587 {
1589 "definition of %q#D ambiguates built-in "
1592 }
1594 "new declaration %q#D ambiguates built-in"
1600 }
1601 }
1603 /* A near match; override the builtin. */
1607 OPT_Wbuiltin_declaration_mismatch,
1608 "new declaration %q#D ambiguates built-in "
1610 else
1615 }
1616 else
1617 /* Discard the old built-in function. */
1620 /* Replace the old RTL to avoid problems with inlining. */
1622 }
1623 /* Even if the types match, prefer the new declarations type for
1624 built-ins which have not been explicitly declared, for
1625 exception lists, etc... */
1627 {
1634 }
1636 /* If a function is explicitly declared "throw ()", propagate that to
1637 the corresponding builtin. */
1642 {
1647 }
1649 /* Whether or not the builtin can throw exceptions has no
1650 bearing on this declarator. */
1654 {
1655 /* If a builtin function is redeclared as `static', merge
1656 the declarations, but make the original one static. */
1660 /* Make the old declaration consistent with the new one so
1661 that all remnants of the builtin-ness of this function
1662 will be banished. */
1665 }
1666 }
1668 {
1669 /* C++ Standard, 3.3, clause 4:
1670 "[Note: a namespace name or a class template name must be unique
1671 in its declarative region (7.3.2, clause 14). ]" */
1678 {
1683 {
1684 /* We do nothing special here, because C++ does such nasty
1685 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1686 get shadowed, and know that if we need to find a TYPE_DECL
1687 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1688 slot of the identifier. */
1690 }
1697 }
1706 }
1708 {
1710 /* These are certainly not duplicate declarations; they're
1711 from different scopes. */
1715 {
1716 /* The name of a class template may not be declared to refer to
1717 any other template, class, function, object, namespace, value,
1718 or type in the same scope. */
1721 {
1726 }
1733 /* Template functions can be disambiguated by
1734 return type. */
1737 // Template functions can also be disambiguated by
1738 // constraints.
1740 {
1744 }
1748 }
1750 {
1752 {
1754 newdecl);
1758 }
1759 /* For function versions, params and types match, but they
1760 are not ambiguous. */
1763 // The functions have the same parameter types.
1766 // And the same constraints.
1768 {
1773 }
1774 else
1776 }
1777 else
1778 {
1783 }
1784 }
1794 /* It's OK to have a template specialization and a non-template
1795 with the same type, or to have specializations of two
1796 different templates with the same type. Note that if one is a
1797 specialization, and the other is an instantiation of the same
1798 template, that we do not exit at this point. That situation
1799 can occur if we instantiate a template class, and then
1800 specialize one of its methods. This situation is valid, but
1801 the declarations must be merged in the usual way. */
1808 /* One of the declarations is a template instantiation, and the
1809 other is not a template at all. That's OK. */
1812 {
1813 /* In [namespace.alias] we have:
1815 In a declarative region, a namespace-alias-definition can be
1816 used to redefine a namespace-alias declared in that declarative
1817 region to refer only to the namespace to which it already
1818 refers.
1820 Therefore, if we encounter a second alias directive for the same
1821 alias, we can just ignore the second directive. */
1827 /* Leave it to update_binding to merge or report error. */
1829 }
1830 else
1831 {
1834 {
1842 }
1847 {
1848 /* Prototype decl follows defn w/o prototype. */
1853 }
1856 {
1857 /* [dcl.link]
1858 If two declarations of the same function or object
1859 specify different linkage-specifications ..., the program
1860 is ill-formed.... Except for functions with C++ linkage,
1861 a function declaration without a linkage specification
1862 shall not precede the first linkage specification for
1863 that function. A function can be declared without a
1864 linkage specification after an explicit linkage
1865 specification has been seen; the linkage explicitly
1866 specified in the earlier declaration is not affected by
1867 such a function declaration.
1869 DR 563 raises the question why the restrictions on
1870 functions should not also apply to objects. Older
1871 versions of G++ silently ignore the linkage-specification
1872 for this example:
1874 namespace N {
1875 extern int i;
1876 extern "C" int i;
1877 }
1879 which is clearly wrong. Therefore, we now treat objects
1880 like functions. */
1882 {
1883 /* There is no explicit linkage-specification, so we use
1884 the linkage from the previous declaration. */
1887 }
1888 else
1889 {
1895 }
1896 }
1899 ;
1901 {
1902 /* Note: free functions, as TEMPLATE_DECLs, are handled below. */
1905 as FUNCTION_DECLs. */
1907 /* C++11 8.3.6/6.
1908 Default arguments for a member function of a class
1909 template shall be specified on the initial declaration
1910 of the member function within the class template. */
1913 else
1914 {
1922 {
1925 {
1927 "default argument given for parameter "
1931 olddecl);
1932 }
1933 else
1934 {
1939 olddecl);
1940 }
1941 }
1942 }
1943 }
1944 }
1946 /* Do not merge an implicit typedef with an explicit one. In:
1948 class A;
1949 ...
1950 typedef class A A __attribute__ ((foo));
1952 the attribute should apply only to the typedef. */
1958 /* If new decl is `static' and an `extern' was seen previously,
1959 warn about it. */
1965 /* We have committed to returning 1 at this point. */
1967 {
1968 /* Now that functions must hold information normally held
1969 by field decls, there is extra work to do so that
1970 declaration information does not get destroyed during
1971 definition. */
1989 /* Optionally warn about more than one declaration for the same
1990 name, but don't warn about a function declaration followed by a
1991 definition. */
1994 /* Don't warn about extern decl followed by definition. */
1996 /* Don't warn about friends, let add_friend take care of it. */
1998 /* Don't warn about declaration followed by specialization. */
2001 {
2003 OPT_Wredundant_decls,
2005 newdecl))
2008 }
2012 {
2014 {
2018 }
2020 }
2021 }
2023 /* Deal with C++: must preserve virtual function table size. */
2025 {
2035 }
2037 /* Copy all the DECL_... slots specified in the new decl except for
2038 any that we copy here from the old type. */
2042 else
2046 {
2052 {
2055 }
2056 }
2059 {
2060 tree old_result;
2061 tree new_result;
2073 {
2074 /* Per C++11 8.3.6/4, default arguments cannot be added in later
2075 declarations of a function template. */
2084 {
2087 else
2099 }
2100 else
2101 {
2109 }
2110 }
2112 /* If the new declaration is a definition, update the file and
2113 line information on the declaration, and also make
2114 the old declaration the same definition. */
2116 {
2122 {
2123 tree parm;
2129 }
2130 }
2133 }
2136 {
2140 /* Automatically handles default parameters. */
2142 tree newtype;
2144 /* For typedefs use the old type, as the new type's DECL_NAME points
2145 at newdecl, which will be ggc_freed. */
2147 {
2148 /* But NEWTYPE might have an attribute, honor that. */
2153 {
2157 }
2159 /* And remove the new type from the variants list. */
2161 {
2166 {
2169 }
2170 }
2171 }
2174 else
2178 {
2180 /* For already initialized vars, TREE_READONLY could have been
2181 cleared in cp_finish_decl, because the var needs runtime
2182 initialization or destruction. Make sure not to set
2183 TREE_READONLY on it again. */
2199 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
2202 {
2203 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
2206 }
2207 }
2209 /* An explicit specialization of a function template or of a member
2210 function of a class template can be declared transaction_safe
2211 independently of whether the corresponding template entity is declared
2212 transaction_safe. */
2225 /* Lay the type out, unless already done. */
2239 /* Merge deprecatedness. */
2243 /* Preserve function specific target and optimization options */
2245 {
2255 }
2256 else
2257 {
2258 /* Merge the const type qualifier. */
2261 /* Merge the volatile type qualifier. */
2264 }
2266 /* Merge the initialization information. */
2269 {
2273 {
2276 }
2277 }
2280 {
2290 else
2291 {
2292 /* Merge the noreturn bit. */
2298 }
2299 /* Keep the old RTL. */
2301 }
2304 {
2305 /* Keep the old RTL. We cannot keep the old RTL if the old
2306 declaration was for an incomplete object and the new
2307 declaration is not since many attributes of the RTL will
2308 change. */
2310 }
2311 }
2312 /* If cannot merge, then use the new type and qualifiers,
2313 and don't preserve the old rtl. */
2314 else
2315 {
2316 /* Clean out any memory we had of the old declaration. */
2326 }
2328 /* Merge the storage class information. */
2341 {
2350 {
2357 }
2360 {
2364 }
2369 /* If the OLDDECL is an instantiation and/or specialization,
2370 then the NEWDECL must be too. But, it may not yet be marked
2371 as such if the caller has created NEWDECL, but has not yet
2372 figured out that it is a redeclaration. */
2376 /* Don't really know how much of the language-specific
2377 values we should copy from old to new. */
2384 {
2388 {
2392 /* Remember the presence of explicit specialization args. */
2395 }
2397 }
2398 /* Only functions have these fields. */
2400 {
2405 /* DECL_THUNKS is only valid for virtual functions,
2406 otherwise it is a DECL_FRIEND_CONTEXT. */
2409 }
2410 /* Only variables have this field. */
2414 }
2417 {
2418 tree parm;
2420 /* Merge parameter attributes. */
2429 }
2433 {
2434 /* If newdecl is not a specialization, then it is not a
2435 template-related function at all. And that means that we
2436 should have exited above, returning 0. */
2440 /* From [temp.expl.spec]:
2442 If a template, a member template or the member of a class
2443 template is explicitly specialized then that
2444 specialization shall be declared before the first use of
2445 that specialization that would cause an implicit
2446 instantiation to take place, in every translation unit in
2447 which such a use occurs. */
2449 olddecl);
2455 /* Don't propagate visibility from the template to the
2456 specialization here. We'll do that in determine_visibility if
2457 appropriate. */
2460 /* [temp.expl.spec/14] We don't inline explicit specialization
2461 just because the primary template says so. */
2471 }
2473 {
2474 /* Never inline re-defined extern inline functions.
2475 FIXME: this could be better handled by keeping both
2476 function as separate declarations. */
2478 }
2479 else
2480 {
2482 {
2486 }
2488 ;
2502 }
2504 /* Preserve abstractness on cloned [cd]tors. */
2507 /* Update newdecl's parms to point at olddecl. */
2513 {
2517 }
2519 {
2520 /* These need to be copied so that the names are available.
2521 Note that if the types do match, we'll preserve inline
2522 info and other bits, but if not, we won't. */
2525 }
2526 /* If redeclaring a builtin function, it stays built in
2527 if newdecl is a gnu_inline definition, or if newdecl is just
2528 a declaration. */
2531 {
2534 /* If we're keeping the built-in definition, keep the rtl,
2535 regardless of declaration matches. */
2538 {
2541 {
2542 /* If a compatible prototype of these builtin functions
2543 is seen, assume the runtime implements it with the
2544 expected semantics. */
2553 }
2554 }
2557 }
2559 /* If defining a function declared with other language
2560 linkage, use the previously declared language linkage. */
2563 {
2565 /* Don't clear out the arguments if we're just redeclaring a
2566 function. */
2569 }
2570 }
2574 /* Now preserve various other info from the definition. */
2580 /* Warn about conflicting visibility specifications. */
2584 {
2586 "%qD: visibility attribute ignored because it "
2590 }
2591 /* Choose the declaration which specified visibility. */
2593 {
2596 }
2597 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2598 so keep this behavior. */
2600 {
2603 }
2604 /* Likewise for DECL_ALIGN, DECL_USER_ALIGN and DECL_PACKED. */
2606 {
2609 }
2618 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2619 with that from NEWDECL below. */
2621 {
2625 }
2627 /* Merge the USED information. */
2633 {
2638 }
2644 /* Merge the DECL_FUNCTION_VERSIONED information. newdecl will be copied
2645 to olddecl and deleted. */
2648 {
2649 /* Set the flag for newdecl so that it gets copied to olddecl. */
2651 /* newdecl will be purged after copying to olddecl and is no longer
2652 a version. */
2654 }
2657 {
2671 /* Preserve symtab node mapping. */
2675 /* If newdecl is a template instantiation, it is possible that
2676 the following sequence of events has occurred:
2678 o A friend function was declared in a class template. The
2679 class template was instantiated.
2681 o The instantiation of the friend declaration was
2682 recorded on the instantiation list, and is newdecl.
2684 o Later, however, instantiate_class_template called pushdecl
2685 on the newdecl to perform name injection. But, pushdecl in
2686 turn called duplicate_decls when it discovered that another
2687 declaration of a global function with the same name already
2688 existed.
2690 o Here, in duplicate_decls, we decided to clobber newdecl.
2692 If we're going to do that, we'd better make sure that
2693 olddecl, and not newdecl, is on the list of
2694 instantiations so that if we try to do the instantiation
2695 again we won't get the clobbered declaration. */
2697 new_template_info,
2698 olddecl);
2699 }
2700 else
2701 {
2708 {
2716 {
2729 }
2737 }
2738 }
2741 {
2745 {
2746 /* Merge the section attribute.
2747 We want to issue an error if the sections conflict but that must be
2748 done later in decl_attributes since we are called before attributes
2749 are assigned. */
2754 {
2758 else
2762 }
2763 }
2767 {
2771 }
2772 }
2778 {
2781 }
2783 /* NEWDECL contains the merged attribute lists.
2784 Update OLDDECL to be the same. */
2787 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2788 so that encode_section_info has a chance to look at the new decl
2789 flags and attributes. */
2796 /* The NEWDECL will no longer be needed. Because every out-of-class
2797 declaration of a member results in a call to duplicate_decls,
2798 freeing these nodes represents in a significant savings.
2800 Before releasing the node, be sore to remove function from symbol
2801 table that might have been inserted there to record comdat group.
2802 Be sure to however do not free DECL_STRUCT_FUNCTION because this
2803 structure is shared in between newdecl and oldecl. */
2807 {
2811 }
2813 /* Remove the associated constraints for newdecl, if any, before
2814 reclaiming memory. */
2821 }
2822 \f
2823 /* Return zero if the declaration NEWDECL is valid
2824 when the declaration OLDDECL (assumed to be for the same name)
2825 has already been seen.
2826 Otherwise return an error message format string with a %s
2827 where the identifier should go. */
2831 {
2833 {
2834 /* Because C++ can put things into name space for free,
2835 constructs like "typedef struct foo { ... } foo"
2836 would look like an erroneous redeclaration. */
2839 else
2841 }
2843 {
2844 /* If this is a pure function, its olddecl will actually be
2845 the original initialization to `0' (which we force to call
2846 abort()). Don't complain about redefinition in this case. */
2851 /* If both functions come from different namespaces, this is not
2852 a redeclaration - this is a conflict with a used function. */
2858 /* We'll complain about linkage mismatches in
2859 warn_extern_redeclared_static. */
2861 /* Defining the same name twice is no good. */
2864 {
2870 }
2873 {
2878 {
2882 else
2885 }
2886 }
2888 check_abi_tag_redeclaration
2893 }
2895 {
2899 {
2904 }
2922 {
2927 {
2931 else
2934 }
2935 }
2937 /* Core issue #226 (C++0x):
2939 If a friend function template declaration specifies a
2940 default template-argument, that declaration shall be a
2941 definition and shall be the only declaration of the
2942 function template in the translation unit. */
2953 }
2959 {
2960 /* Only variables can be thread-local, and all declarations must
2961 agree on this property. */
2965 else
2968 }
2970 {
2971 /* The objects have been declared at namespace scope. If either
2972 is a member of an anonymous union, then this is an invalid
2973 redeclaration. For example:
2975 int i;
2976 union { int i; };
2978 is invalid. */
2982 /* If at least one declaration is a reference, there is no
2983 conflict. For example:
2985 int i = 3;
2986 extern int i;
2988 is valid. */
2992 /* Static data member declared outside a class definition
2993 if the variable is defined within the class with constexpr
2994 specifier is declaration rather than definition (and
2995 deprecated). */
3001 {
3003 /* For now, only warn with explicit -Wdeprecated. */
3006 "redundant redeclaration of %<constexpr%> static "
3011 }
3013 /* Reject two definitions. */
3015 }
3016 else
3017 {
3018 /* Objects declared with block scope: */
3019 /* Reject two definitions, and reject a definition
3020 together with an external reference. */
3024 }
3025 }
3026 \f
3028 /* Hash and equality functions for the named_label table. */
3030 hashval_t
3032 {
3034 }
3036 bool
3038 {
3040 }
3042 /* Look for a label named ID in the current function. If one cannot
3043 be found, create one. Return the named_label_entry, or NULL on
3044 failure. */
3048 {
3049 /* You can't use labels at global scope. */
3051 {
3054 }
3060 named_label_entry **slot
3065 {
3070 {
3074 }
3075 }
3077 /* We are making a new decl, create or reuse the named_label_entry */
3081 else
3082 {
3087 }
3089 /* Now create the LABEL_DECL. */
3095 {
3099 }
3104 }
3106 /* Wrapper for lookup_label_1. */
3108 tree
3110 {
3115 }
3117 tree
3119 {
3124 }
3126 /* Returns nonzero if it is ill-formed to jump past the declaration of
3127 DECL. Returns 2 if it's also a real problem. */
3129 static int
3131 {
3132 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
3133 with automatic storage duration is not in scope to a point where it is
3134 in scope is ill-formed unless the variable has scalar type, class type
3135 with a trivial default constructor and a trivial destructor, a
3136 cv-qualified version of one of these types, or an array of one of the
3137 preceding types and is declared without an initializer (8.5). */
3152 }
3154 /* A subroutine of check_previous_goto_1 and check_goto to identify a branch
3155 to the user. */
3157 static bool
3159 diagnostic_t diag_kind)
3160 {
3161 bool complained
3168 }
3170 /* Check that a single previously seen jump to a newly defined label
3171 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
3172 the jump context; NAMES are the names in scope in LEVEL at the jump
3173 context; LOCUS is the source position of the jump or 0. Returns
3174 true if all is well. */
3176 static bool
3179 {
3186 {
3192 }
3195 {
3201 {
3207 {
3209 DK_PERMERROR);
3211 }
3213 {
3217 else
3219 " enters scope of %q#D, which has "
3221 }
3222 }
3230 {
3257 {
3261 }
3266 }
3269 {
3275 }
3276 }
3279 }
3281 static void
3283 {
3287 }
3289 static bool
3291 {
3293 }
3295 /* Check that a new jump to a label DECL is OK. Called by
3296 finish_goto_stmt. */
3298 void
3300 {
3301 /* We can't know where a computed goto is jumping.
3302 So we assume that it's OK. */
3306 /* We didn't record any information about this label when we created it,
3307 and there's not much point since it's trivial to analyze as a return. */
3312 named_label_entry **slot
3316 /* If the label hasn't been defined yet, defer checking. */
3318 {
3319 /* Don't bother creating another use if the last goto had the
3320 same data, and will therefore create the same set of errors. */
3325 named_label_use_entry *new_use
3335 }
3339 tree bad;
3345 {
3353 }
3356 {
3360 {
3361 /* Can't skip init of __exception_info. */
3363 {
3367 }
3371 }
3373 {
3377 else
3379 " enters scope of %q#D which has "
3381 }
3382 }
3385 {
3394 }
3397 {
3400 }
3403 {
3407 {
3409 {
3414 }
3418 }
3419 }
3420 }
3422 /* Check that a return is ok wrt OpenMP structured blocks.
3423 Called by finish_return_stmt. Returns true if all is well. */
3425 bool
3427 {
3430 {
3433 }
3437 }
3439 /* Define a label, specifying the location in the source file.
3440 Return the LABEL_DECL node for the label. */
3442 static tree
3444 {
3445 /* After labels, make any new cleanups in the function go into their
3446 own new (temporary) binding contour. */
3456 {
3459 }
3460 else
3461 {
3462 /* Mark label as having been defined. */
3464 /* Say where in the source. */
3473 }
3476 }
3478 /* Wrapper for define_label_1. */
3480 tree
3482 {
3487 }
3490 struct cp_switch
3491 {
3494 /* The SWITCH_STMT being built. */
3495 tree switch_stmt;
3496 /* A splay-tree mapping the low element of a case range to the high
3497 element, or NULL_TREE if there is no high element. Used to
3498 determine whether or not a new case label duplicates an old case
3499 label. We need a tree, rather than simply a hash table, because
3500 of the GNU case range extension. */
3501 splay_tree cases;
3502 /* Remember whether there was a case value that is outside the
3503 range of the original type of the controlling expression. */
3505 /* Remember whether a default: case label has been seen. */
3507 /* Remember whether a BREAK_STMT has been seen in this SWITCH_STMT. */
3509 /* Set if inside of {FOR,DO,WHILE}_BODY nested inside of a switch,
3510 where BREAK_STMT doesn't belong to the SWITCH_STMT. */
3512 };
3514 /* A stack of the currently active switch statements. The innermost
3515 switch statement is on the top of the stack. There is no need to
3516 mark the stack for garbage collection because it is only active
3517 during the processing of the body of a function, and we never
3518 collect at that point. */
3522 /* Called right after a switch-statement condition is parsed.
3523 SWITCH_STMT is the switch statement being parsed. */
3525 void
3527 {
3538 }
3540 void
3542 {
3544 location_t switch_location;
3546 /* Emit warnings as needed. */
3548 const bool bool_cond_p
3557 /* For the benefit of block_may_fallthru remember if the switch body
3558 case labels cover all possible values and if there are break; stmts. */
3560 || (!processing_template_decl
3570 }
3572 /* Note that a BREAK_STMT is about to be added. If it is inside of
3573 a SWITCH_STMT and not inside of a loop body inside of it, note
3574 in switch_stack we've seen a BREAK_STMT. */
3576 void
3578 {
3581 }
3583 /* Note the start of processing of an iteration statement's body.
3584 The note_break_stmt function will do nothing while processing it.
3585 Return a flag that should be passed to note_iteration_stmt_body_end. */
3587 bool
3589 {
3595 }
3597 /* Note the end of processing of an iteration statement's body. */
3599 void
3601 {
3604 }
3606 /* Convert a case constant VALUE in a switch to the type TYPE of the switch
3607 condition. Note that if TYPE and VALUE are already integral we don't
3608 really do the conversion because the language-independent
3609 warning/optimization code will work better that way. */
3611 static tree
3613 {
3622 {
3625 value = (perform_implicit_conversion_flags
3628 }
3630 }
3632 /* Note that we've seen a definition of a case label, and complain if this
3633 is a bad place for one. */
3635 tree
3637 {
3640 tree type;
3646 {
3647 tree label;
3649 /* For templates, just add the case label; we'll do semantic
3650 analysis at instantiation-time. */
3653 }
3655 /* Find the condition on which this switch statement depends. */
3672 /* After labels, make any new cleanups in the function go into their
3673 own new (temporary) binding contour. */
3680 }
3681 \f
3683 tree scope;
3684 tree name;
3685 tree template_id;
3688 };
3691 {
3694 /* Hash a TYPENAME_TYPE. */
3696 static hashval_t
3698 {
3699 hashval_t hash;
3705 }
3707 /* Compare two TYPENAME_TYPEs. */
3709 static bool
3711 {
3717 }
3718 };
3720 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3721 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3723 Returns the new TYPENAME_TYPE. */
3727 tree
3730 {
3731 tree t;
3732 tree d;
3733 typename_info ti;
3735 hashval_t hash;
3750 /* See if we already have this type. */
3754 else
3755 {
3756 /* Build the TYPENAME_TYPE. */
3763 /* Build the corresponding TYPE_DECL. */
3770 /* Store it in the hash table. */
3773 /* TYPENAME_TYPEs must always be compared structurally, because
3774 they may or may not resolve down to another type depending on
3775 the currently open classes. */
3777 }
3780 }
3782 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3783 provided to name the type. Returns an appropriate type, unless an
3784 error occurs, in which case error_mark_node is returned. If we
3785 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3786 return that, rather than the _TYPE it corresponds to, in other
3787 cases we look through the type decl. If TF_ERROR is set, complain
3788 about errors, otherwise be quiet. */
3790 tree
3792 tsubst_flags_t complain)
3793 {
3794 tree fullname;
3795 tree t;
3804 {
3809 else
3810 /* Create a TEMPLATE_ID_EXPR for the type. */
3814 }
3821 {
3826 {
3830 }
3831 }
3833 {
3837 }
3842 {
3846 }
3848 /* When the CONTEXT is a dependent type, NAME could refer to a
3849 dependent base class of CONTEXT. But look inside it anyway
3850 if CONTEXT is a currently open scope, in case it refers to a
3851 member of the current instantiation or a non-dependent base;
3852 lookup will stop when we hit a dependent base. */
3854 /* We should only set WANT_TYPE when we're a nested typename type.
3855 Then we can give better diagnostics if we find a non-type. */
3857 else
3866 {
3868 {
3871 else
3874 }
3876 }
3878 /* Pull out the template from an injected-class-name (or multiple). */
3883 {
3885 {
3888 }
3890 }
3893 {
3898 }
3900 {
3905 }
3910 /* If we are currently parsing a template and if T is a typedef accessed
3911 through CONTEXT then we need to remember and check access of T at
3912 template instantiation time. */
3927 }
3929 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3930 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3931 in which case error_mark_node is returned.
3933 If PARM_LIST is non-NULL, also make sure that the template parameter
3934 list of TEMPLATE_DECL matches.
3936 If COMPLAIN zero, don't complain about any errors that occur. */
3938 tree
3940 tsubst_flags_t complain)
3941 {
3942 tree t;
3943 tree d;
3953 {
3963 {
3967 }
3971 {
3973 {
3977 }
3979 }
3982 complain))
3986 }
3988 /* Build the UNBOUND_CLASS_TEMPLATE. */
3994 /* Build the corresponding TEMPLATE_DECL. */
4003 }
4005 \f
4007 /* Push the declarations of builtin types into the global namespace.
4008 RID_INDEX is the index of the builtin type in the array
4009 RID_POINTERS. NAME is the name used when looking up the builtin
4010 type. TYPE is the _TYPE node for the builtin type.
4012 The calls to set_global_binding below should be
4013 eliminated. Built-in types should not be looked up name; their
4014 names are keywords that the parser can recognize. However, there
4015 is code in c-common.c that uses identifier_global_value to look up
4016 built-in types by name. */
4018 void
4021 tree type)
4022 {
4026 {
4032 }
4037 {
4043 }
4046 {
4050 }
4051 }
4053 /* Push a type into the namespace so that the back ends ignore it. */
4055 static void
4057 {
4060 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
4067 }
4069 /* Create all the predefined identifiers. */
4071 static void
4073 {
4074 struct predefined_identifier
4075 {
4079 };
4081 /* A table of identifiers to create at startup. */
4085 /* Some of these names have a trailing space so that it is
4086 impossible for them to conflict with names written by users. */
4103 /* The demangler expects anonymous namespaces to be called
4104 something starting with '_GLOBAL__N_'. It no longer needs
4105 to be unique to the TU. */
4111 };
4115 {
4117 /* Some of these identifiers already have a special kind. */
4120 }
4121 }
4123 /* Create the predefined scalar types of C,
4124 and some nodes representing standard constants (0, 1, (void *)0).
4125 Initialize the global binding level.
4126 Make definitions for built-in primitive functions. */
4128 void
4130 {
4131 tree void_ftype;
4132 tree void_ftype_ptr;
4134 /* Create all the identifiers we need. */
4137 /* Create the global variables. */
4142 /* Enter the global namespace. */
4145 void_type_node);
4149 /* Remember whether we want the empty class passing ABI change warning
4150 in this TU. */
4153 debug_hooks->register_main_translation_unit
4161 /* Initially, C. */
4164 /* Create the `std' namespace. */
4170 /* There's no fixed location for <command-line>, the current
4171 location is <builtins>, which is somewhat confusing. */
4183 /* Guess at the initial static decls size. */
4186 /* ... and keyed classes. */
4198 NULL_TREE);
4200 #if 0
4202 #endif
4211 void_ftype_ptr
4214 /* Create the conversion operator marker. This operator's DECL_NAME
4215 is in the identifier table, so we can use identifier equality to
4216 find it. */
4218 void_ftype);
4220 /* C++ extensions */
4225 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
4228 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
4229 result. */
4236 {
4237 /* Make sure we get a unique function type, so we can give
4238 its pointer type a name. (This wins for gdb.) */
4245 }
4248 vtbl_type_node
4267 /* Now, C++. */
4272 {
4275 }
4281 {
4284 tree ptr_ftype_sizetype;
4285 tree new_eh_spec;
4287 ptr_ftype_sizetype
4290 {
4291 tree bad_alloc_id;
4292 tree bad_alloc_type_node;
4293 tree bad_alloc_decl;
4299 bad_alloc_decl
4304 new_eh_spec
4306 }
4307 else
4310 /* Ensure attribs.c is initialized. */
4313 /* Ensure constraint.cc is initialized. */
4317 NULL_TREE);
4320 extvisattr);
4334 {
4335 /* Also push the sized deallocation variants:
4336 void operator delete(void*, std::size_t) throw();
4337 void operator delete[](void*, std::size_t) throw(); */
4338 tree void_ftype_ptr_size
4342 extvisattr);
4346 }
4349 {
4356 /* operator new (size_t, align_val_t); */
4368 /* operator delete (void *, align_val_t); */
4377 {
4378 /* operator delete (void *, size_t, align_val_t); */
4381 NULL_TREE);
4386 }
4387 }
4399 }
4401 abort_fndecl
4405 /* Perform other language dependent initializations. */
4419 /* Show we use EH for cleanups. */
4422 }
4424 /* Generate an initializer for a function naming variable from
4425 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
4426 filled in with the type of the init. */
4428 tree
4430 {
4432 tree type;
4437 {
4441 }
4450 else
4454 }
4456 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
4457 the decl, LOC is the location to give the decl, NAME is the
4458 initialization string and TYPE_DEP indicates whether NAME depended
4459 on the type of the function. We make use of that to detect
4460 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
4461 at the point of first use, so we mustn't push the decl now. */
4463 static tree
4465 {
4468 tree type;
4482 {
4486 LOOKUP_ONLYCONVERTING);
4487 }
4488 else
4489 {
4492 }
4495 }
4497 static tree
4499 {
4507 /* Runtime library routines are, by definition, available in an
4508 external shared object. */
4514 /* A function in the user's namespace should have an explicit
4515 declaration before it is used. Mark the built-in function as
4516 anticipated but not actually declared. */
4520 {
4523 /* Treat __*_chk fortification functions as anticipated as well,
4524 unless they are __builtin_*. */
4529 }
4533 else
4537 }
4539 tree
4541 {
4544 /* All builtins that don't begin with an '_' should additionally
4545 go in the 'std' namespace. */
4547 {
4552 }
4555 }
4557 /* Like cxx_builtin_function, but guarantee the function is added to the global
4558 scope. This is to allow function specific options to add new machine
4559 dependent builtins when the target ISA changes via attribute((target(...)))
4560 which saves space on program startup if the program does not use non-generic
4561 ISAs. */
4563 tree
4565 {
4569 /* All builtins that don't begin with an '_' should additionally
4570 go in the 'std' namespace. */
4572 {
4577 }
4580 }
4582 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
4583 function. Not called directly. */
4585 static tree
4588 {
4596 /* Runtime library routines are, by definition, available in an
4597 external shared object. */
4602 }
4604 /* Returns the _DECL for a library function with C++ linkage. */
4606 static tree
4609 {
4614 }
4616 /* Like build_library_fn, but takes a C string instead of an
4617 IDENTIFIER_NODE. */
4619 tree
4621 {
4623 }
4625 /* Like build_cp_library_fn, but takes a C string instead of an
4626 IDENTIFIER_NODE. */
4628 tree
4630 {
4632 ecf_flags);
4633 }
4635 /* Like build_library_fn, but also pushes the function so that we will
4636 be able to find it via get_global_binding. Also, the function
4637 may throw exceptions listed in RAISES. */
4639 tree
4641 {
4642 tree fn;
4650 }
4652 /* Like build_cp_library_fn, but also pushes the function so that it
4653 will be found by normal lookup. */
4655 static tree
4658 {
4665 }
4667 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
4668 a FUNCTION_TYPE. */
4670 tree
4672 {
4675 }
4677 /* Like push_library_fn, but also note that this function throws
4678 and does not return. Used for __throw_foo and the like. */
4680 tree
4682 {
4685 }
4686 \f
4687 /* When we call finish_struct for an anonymous union, we create
4688 default copy constructors and such. But, an anonymous union
4689 shouldn't have such things; this function undoes the damage to the
4690 anonymous union type T.
4692 (The reason that we create the synthesized methods is that we don't
4693 distinguish `union { int i; }' from `typedef union { int i; } U'.
4694 The first is an anonymous union; the second is just an ordinary
4695 union type.) */
4697 void
4699 {
4700 /* Wipe out memory of synthesized methods. */
4708 /* Splice the implicitly generated functions out of TYPE_FIELDS. */
4712 else
4715 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4716 assignment operators (because they cannot have these methods themselves).
4717 For anonymous unions this is already checked because they are not allowed
4718 in any union, otherwise we have to check it. */
4720 {
4725 {
4728 {
4738 }
4739 }
4740 }
4741 }
4743 /* Warn for an attribute located at LOCATION that appertains to the
4744 class type CLASS_TYPE that has not been properly placed after its
4745 class-key, in it class-specifier. */
4747 void
4749 tree class_type)
4750 {
4754 "attribute ignored in declaration "
4759 }
4761 /* Make sure that a declaration with no declarator is well-formed, i.e.
4762 just declares a tagged type or anonymous union.
4764 Returns the type declared; or NULL_TREE if none. */
4766 tree
4769 {
4772 /* If a class, struct, or enum type is declared by the DECLSPECS
4773 (i.e, if a class-specifier, enum-specifier, or non-typename
4774 elaborated-type-specifier appears in the DECLSPECS),
4775 DECLARED_TYPE is set to the corresponding type. */
4782 {
4788 }
4801 {
4803 "%<auto%> can only be specified for variables "
4806 }
4807 /* Check for an anonymous union. */
4810 {
4811 /* 7/3 In a simple-declaration, the optional init-declarator-list
4812 can be omitted only when declaring a class (clause 9) or
4813 enumeration (7.2), that is, when the decl-specifier-seq contains
4814 either a class-specifier, an elaborated-type-specifier with
4815 a class-key (9.1), or an enum-specifier. In these cases and
4816 whenever a class-specifier or enum-specifier is present in the
4817 decl-specifier-seq, the identifiers in these specifiers are among
4818 the names being declared by the declaration (as class-name,
4819 enum-names, or enumerators, depending on the syntax). In such
4820 cases, and except for the declaration of an unnamed bit-field (9.6),
4821 the decl-specifier-seq shall introduce one or more names into the
4822 program, or shall redeclare a name introduced by a previous
4823 declaration. [Example:
4824 enum { }; // ill-formed
4825 typedef class { }; // ill-formed
4826 --end example] */
4828 {
4831 }
4838 }
4840 else
4841 {
4849 && (!current_class_type
4858 "a storage class can only be specified for objects "
4862 "%<const%> can only be specified for objects and "
4866 "%<volatile%> can only be specified for objects and "
4870 "%<__restrict%> can only be specified for objects and "
4874 "%<__thread%> can only be specified for objects "
4882 }
4885 {
4886 location_t loc;
4889 /* For a non-template class, use the name location. */
4891 else
4892 /* For a template class (an explicit instantiation), use the
4893 current location. */
4897 /* [dcl.attr.grammar]/4:
4899 No attribute-specifier-seq shall appertain to an explicit
4900 instantiation. */
4901 {
4904 declared_type))
4906 "no attribute can be applied to "
4908 }
4909 else
4911 }
4914 }
4916 /* Called when a declaration is seen that contains no names to declare.
4917 If its type is a reference to a structure, union or enum inherited
4918 from a containing scope, shadow that tag name for the current scope
4919 with a forward reference.
4920 If its type defines a new named structure or union
4921 or defines an enum, it is valid but we need not do anything here.
4922 Otherwise, it is an error.
4924 C++: may have to grok the declspecs to learn about static,
4925 complain for anonymous unions.
4927 Returns the TYPE declared -- or NULL_TREE if none. */
4929 tree
4931 {
4941 /* This is where the variables in an anonymous union are
4942 declared. An anonymous union declaration looks like:
4943 union { ... } ;
4944 because there is no declarator after the union, the parser
4945 sends that declaration here. */
4947 {
4951 {
4955 }
4956 }
4959 }
4960 \f
4961 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4963 tree
4967 {
4968 tree attrs;
4969 tree type;
4970 enum decl_context context
4976 {
4981 /* A template type parameter or other dependent type. */
4984 else
4986 }
4988 }
4990 /* Process a DECLARATOR for a function-scope variable declaration,
4991 namespace-scope variable declaration, or function declaration.
4992 (Function definitions go through start_function; class member
4993 declarations appearing in the body of the class go through
4994 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4995 If an error occurs, the error_mark_node is returned instead.
4997 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4998 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4999 for an explicitly defaulted function, or SD_DELETED for an explicitly
5000 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
5001 implicitly initialized via a default constructor. ATTRIBUTES and
5002 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
5004 The scope represented by the context of the returned DECL is pushed
5005 (if it is not the global namespace) and is assigned to
5006 *PUSHED_SCOPE_P. The caller is then responsible for calling
5007 pop_scope on *PUSHED_SCOPE_P if it is set. */
5009 tree
5013 tree attributes,
5014 tree prefix_attributes,
5016 {
5017 tree decl;
5018 tree context;
5025 /* An object declared as __attribute__((deprecated)) suppresses
5026 warnings of uses of other deprecated items. */
5045 /* Is it valid for this decl to have an initializer at all?
5046 If not, set INITIALIZED to zero, which will indirectly
5047 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
5050 {
5053 }
5056 {
5060 decl);
5064 }
5070 /* If this is a typedef that names the class for linkage purposes
5071 (7.1.3p8), apply any attributes directly to the type. */
5076 else
5079 /* Set attributes here so if duplicate decl, will have proper attributes. */
5082 /* Dllimported symbols cannot be defined. Static data members (which
5083 can be initialized in-class and dllimported) go through grokfield,
5084 not here, so we don't need to exclude those decls when checking for
5085 a definition. */
5087 {
5090 }
5092 /* If #pragma weak was used, mark the decl weak now. */
5104 {
5108 {
5118 {
5124 }
5125 else
5126 {
5131 {
5138 }
5139 /* Static data member are tricky; an in-class initialization
5140 still doesn't provide a definition, so the in-class
5141 declaration will have DECL_EXTERNAL set, but will have an
5142 initialization. Thus, duplicate_decls won't warn
5143 about this situation, and so we check here. */
5152 }
5153 }
5154 else
5155 {
5157 this_tmpl
5158 ? current_template_parms
5164 }
5166 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
5168 /* Do not mark DECL as an explicit specialization if it was not
5169 already marked as an instantiation; a declaration should
5170 never be marked as a specialization unless we know what
5171 template is being specialized. */
5173 {
5178 else
5181 /* [temp.expl.spec] An explicit specialization of a static data
5182 member of a template is a definition if the declaration
5183 includes an initializer; otherwise, it is a declaration.
5185 We check for processing_specialization so this only applies
5186 to the new specialization syntax. */
5189 }
5192 /* Aliases are definitions. */
5195 decl);
5196 }
5200 /* Enter this declaration into the symbol table. Don't push the plain
5201 VAR_DECL for a variable template. */
5214 {
5215 /* This is a const variable with implicit 'static'. Set
5216 DECL_THIS_STATIC so we can tell it from variables that are
5217 !TREE_PUBLIC because of the anonymous namespace. */
5220 }
5224 {
5228 decl);
5231 else
5235 }
5241 }
5243 /* Process the declaration of a variable DECL. INITIALIZED is true
5244 iff DECL is explicitly initialized. (INITIALIZED is false if the
5245 variable is initialized via an implicitly-called constructor.)
5246 This function must be called for ordinary variables (including, for
5247 example, implicit instantiations of templates), but must not be
5248 called for template declarations. */
5250 void
5252 {
5253 tree type;
5268 /* If an explicit initializer is present, or if this is a definition
5269 of an aggregate, then we need a complete type at this point.
5270 (Scalars are always complete types, so there is nothing to
5271 check.) This code just sets COMPLETE_P; errors (if necessary)
5272 are issued below. */
5274 && !complete_p
5276 {
5278 /* We will not yet have set TREE_READONLY on DECL if the type
5279 was "const", but incomplete, before this point. But, now, we
5280 have a complete type, so we can try again. */
5282 }
5285 /* Is it valid for this decl to have an initializer at all? */
5286 {
5287 /* Don't allow initializations for incomplete types except for
5288 arrays which might be completed by the initialization. */
5294 {
5297 }
5299 {
5302 /* else we already gave an error in start_decl. */
5303 }
5304 }
5306 {
5309 else
5310 {
5312 decl);
5313 /* Change the type so that assemble_variable will give
5314 DECL an rtl we can live with: (mem (const_int 0)). */
5316 }
5317 }
5319 /* Create a new scope to hold this declaration if necessary.
5320 Whether or not a new scope is necessary cannot be determined
5321 until after the type has been completed; if the type is a
5322 specialization of a class template it is not until after
5323 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
5324 will be set correctly. */
5326 }
5328 /* Handle initialization of references. DECL, TYPE, and INIT have the
5329 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
5330 but will be set to a new CLEANUP_STMT if a temporary is created
5331 that must be destroyed subsequently.
5333 Returns an initializer expression to use to initialize DECL, or
5334 NULL if the initialization can be performed statically.
5336 Quotes on semantics can be found in ARM 8.4.3. */
5338 static tree
5340 {
5342 {
5348 }
5352 tf_warning_or_error);
5357 /* Note: default conversion is only called in very special cases. */
5360 /* check_initializer handles this for non-reference variables, but for
5361 references we need to do it here or the initializer will get the
5362 incomplete array type and confuse later calls to
5363 cp_complete_array_type. */
5368 {
5372 }
5374 /* Convert INIT to the reference type TYPE. This may involve the
5375 creation of a temporary, whose lifetime must be the same as that
5376 of the reference. If so, a DECL_EXPR for the temporary will be
5377 added just after the DECL_EXPR for DECL. That's why we don't set
5378 DECL_INITIAL for local references (instead assigning to them
5379 explicitly); we need to allow the temporary to be initialized
5380 first. */
5382 tf_warning_or_error);
5383 }
5385 /* Designated initializers in arrays are not supported in GNU C++.
5386 The parser cannot detect this error since it does not know whether
5387 a given brace-enclosed initializer is for a class type or for an
5388 array. This function checks that CE does not use a designated
5389 initializer. If it does, an error is issued. Returns true if CE
5390 is valid, i.e., does not have a designated initializer. */
5392 bool
5395 {
5396 /* Designated initializers for array elements are not supported. */
5398 {
5399 /* The parser only allows identifiers as designated
5400 initializers. */
5402 {
5406 }
5408 {
5412 }
5420 {
5421 /* A C99 designator is OK if it matches the current index. */
5423 {
5426 }
5427 else
5429 }
5430 else
5435 }
5438 }
5440 /* When parsing `int a[] = {1, 2};' we don't know the size of the
5441 array until we finish parsing the initializer. If that's the
5442 situation we're in, update DECL accordingly. */
5444 static void
5446 {
5452 {
5453 /* do_default is really a C-ism to deal with tentative definitions.
5454 But let's leave it here to ease the eventual merge. */
5459 /* Check that there are no designated initializers in INIT, as
5460 those are not supported in GNU C++, and as the middle-end
5461 will crash if presented with a non-numeric designated
5462 initializer. */
5464 {
5467 HOST_WIDE_INT i;
5469 {
5474 }
5475 }
5479 else
5480 {
5482 do_default);
5484 {
5488 }
5490 {
5492 {
5495 }
5496 /* If a `static' var's size isn't known, make it extern as
5497 well as static, so it does not get allocated. If it's not
5498 `static', then don't mark it extern; finish_incomplete_decl
5499 will give it a default size and it will get allocated. */
5502 }
5504 {
5507 }
5508 }
5513 }
5514 }
5516 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
5517 any appropriate error messages regarding the layout. */
5519 static void
5521 {
5522 tree type;
5528 /* If we haven't already laid out this declaration, do so now.
5529 Note that we must not call complete type for an external object
5530 because it's type might involve templates that we are not
5531 supposed to instantiate yet. (And it's perfectly valid to say
5532 `extern X x' for some incomplete type `X'.) */
5541 {
5542 /* An automatic variable with an incomplete type: that is an error.
5543 Don't talk about array types here, since we took care of that
5544 message in grokdeclarator. */
5548 }
5549 #if 0
5550 /* Keep this code around in case we later want to control debug info
5551 based on whether a type is "used". (jason 1999-11-11) */
5554 /* Let debugger know it should output info for this type. */
5559 #endif
5564 {
5567 else
5568 {
5572 }
5573 }
5574 }
5576 /* If a local static variable is declared in an inline function, or if
5577 we have a weak definition, we must endeavor to create only one
5578 instance of the variable at link-time. */
5580 void
5582 {
5583 /* Static data in a function with comdat linkage also has comdat
5584 linkage. */
5586 /* Don't mess with __FUNCTION__. */
5591 {
5593 {
5594 /* With weak symbols, we simply make the variable COMDAT;
5595 that will cause copies in multiple translations units to
5596 be merged. */
5598 }
5599 else
5600 {
5603 {
5604 /* Without weak symbols, we can use COMMON to merge
5605 uninitialized variables. */
5608 }
5609 else
5610 {
5611 /* While for initialized variables, we must use internal
5612 linkage -- which means that multiple copies will not
5613 be merged. */
5619 "%q#D are wrong (you%'ll wind up with "
5621 else
5623 "static data %q#D are wrong (you%'ll wind "
5629 }
5630 }
5631 }
5632 }
5634 /* Issue an error message if DECL is an uninitialized const variable.
5635 CONSTEXPR_CONTEXT_P is true when the function is called in a constexpr
5636 context from potential_constant_expression. Returns true if all is well,
5637 false otherwise. */
5639 bool
5641 tsubst_flags_t complain)
5642 {
5645 /* ``Unless explicitly declared extern, a const object does not have
5646 external linkage and must be initialized. ($8.4; $12.1)'' ARM
5647 7.1.6 */
5650 && (constexpr_context_p
5653 {
5659 {
5661 {
5665 }
5666 else
5667 {
5671 "uninitialized variable %qD in %<constexpr%> "
5674 }
5675 }
5679 decl);
5682 {
5683 tree defaulted_ctor;
5690 "constructor is not user-provided because it is "
5693 "and the implicitly-defined constructor does not "
5695 }
5698 }
5701 }
5702 \f
5703 /* Structure holding the current initializer being processed by reshape_init.
5704 CUR is a pointer to the current element being processed, END is a pointer
5705 after the last element present in the initializer. */
5706 struct reshape_iter
5707 {
5710 };
5714 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
5715 returned is the next FIELD_DECL (possibly FIELD itself) that can be
5716 initialized. If there are no more such fields, the return value
5717 will be NULL. */
5719 tree
5721 {
5730 }
5732 /* Return true for [dcl.init.list] direct-list-initialization from
5733 single element of enumeration with a fixed underlying type. */
5735 bool
5737 {
5746 }
5748 /* Subroutine of reshape_init_array and reshape_init_vector, which does
5749 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
5750 INTEGER_CST representing the size of the array minus one (the maximum index),
5751 or NULL_TREE if the array was declared without specifying the size. D is
5752 the iterator within the constructor. */
5754 static tree
5756 tsubst_flags_t complain)
5757 {
5758 tree new_init;
5763 /* The initializer for an array is always a CONSTRUCTOR. */
5767 {
5768 /* Minus 1 is used for zero sized arrays. */
5774 /* sizetype is sign extended, not zero extended. */
5775 else
5777 }
5779 /* Loop until there are no more initializers. */
5783 {
5784 tree elt_init;
5789 complain);
5797 /* This can happen with an invalid initializer (c++/54501). */
5800 }
5803 }
5805 /* Subroutine of reshape_init_r, processes the initializers for arrays.
5806 Parameters are the same of reshape_init_r. */
5808 static tree
5810 {
5819 }
5821 /* Subroutine of reshape_init_r, processes the initializers for vectors.
5822 Parameters are the same of reshape_init_r. */
5824 static tree
5826 {
5832 {
5835 {
5840 }
5843 }
5845 /* For a vector, we initialize it as an array of the appropriate size. */
5850 }
5852 /* Subroutine of reshape_init_r, processes the initializers for classes
5853 or union. Parameters are the same of reshape_init_r. */
5855 static tree
5857 tsubst_flags_t complain)
5858 {
5859 tree field;
5860 tree new_init;
5864 /* The initializer for a class is always a CONSTRUCTOR. */
5869 {
5870 /* [dcl.init.aggr]
5872 An initializer for an aggregate member that is an
5873 empty class shall have the form of an empty
5874 initializer-list {}. */
5876 {
5880 }
5882 }
5884 /* Loop through the initializable fields, gathering initializers. */
5886 {
5887 tree field_init;
5890 /* Handle designated initializers, as an extension. */
5892 {
5897 {
5898 /* We already reshaped this. */
5900 {
5906 }
5907 }
5910 else
5911 {
5916 }
5919 {
5924 }
5925 }
5927 /* If we processed all the member of the class, we are done. */
5937 {
5938 /* This can happen with an invalid initializer for a flexible
5939 array member (c++/54441). */
5943 }
5947 /* [dcl.init.aggr]
5949 When a union is initialized with a brace-enclosed
5950 initializer, the braces shall only contain an
5951 initializer for the first member of the union. */
5956 }
5959 }
5961 /* Subroutine of reshape_init_r. We're in a context where C99 initializer
5962 designators are not valid; either complain or return true to indicate
5963 that reshape_init_r should return error_mark_node. */
5965 static bool
5967 {
5969 {
5973 else
5975 }
5977 }
5979 /* Subroutine of reshape_init, which processes a single initializer (part of
5980 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5981 iterator within the CONSTRUCTOR which points to the initializer to process.
5982 FIRST_INITIALIZER_P is true if this is the first initializer of the
5983 outermost CONSTRUCTOR node. */
5985 static tree
5987 tsubst_flags_t complain)
5988 {
5999 {
6000 /* A complex type can be initialized from one or two initializers,
6001 but braces are not elided. */
6004 {
6006 {
6009 else
6011 }
6012 }
6014 {
6022 }
6024 }
6026 /* A non-aggregate type is always initialized with a single
6027 initializer. */
6029 {
6030 /* It is invalid to initialize a non-aggregate type with a
6031 brace-enclosed initializer before C++0x.
6032 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
6033 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
6034 a CONSTRUCTOR (with a record type). */
6036 /* Don't complain about a capture-init. */
6039 {
6041 {
6043 /* Isn't value-initialization. */
6045 {
6048 type);
6050 }
6051 }
6052 else
6054 }
6058 }
6060 /* "If T is a class type and the initializer list has a single element of
6061 type cv U, where U is T or a class derived from T, the object is
6062 initialized from that element." Even if T is an aggregate. */
6064 && first_initializer_p
6067 {
6070 }
6072 /* [dcl.init.aggr]
6074 All implicit type conversions (clause _conv_) are considered when
6075 initializing the aggregate member with an initializer from an
6076 initializer-list. If the initializer can initialize a member,
6077 the member is initialized. Otherwise, if the member is itself a
6078 non-empty subaggregate, brace elision is assumed and the
6079 initializer is considered for the initialization of the first
6080 member of the subaggregate. */
6082 /* But don't try this for the first initializer, since that would be
6083 looking through the outermost braces; A a2 = { a1 }; is not a
6084 valid aggregate initialization. */
6085 && !first_initializer_p
6088 complain)))
6089 {
6092 }
6094 /* [dcl.init.string]
6096 A char array (whether plain char, signed char, or unsigned char)
6097 can be initialized by a string-literal (optionally enclosed in
6098 braces); a wchar_t array can be initialized by a wide
6099 string-literal (optionally enclosed in braces). */
6102 {
6105 /* Strip one level of braces if and only if they enclose a single
6106 element (as allowed by [dcl.init.string]). */
6110 {
6112 }
6114 /* If it's a string literal, then it's the initializer for the array
6115 as a whole. Otherwise, continue with normal initialization for
6116 array types (one value per array element). */
6118 {
6123 }
6124 }
6126 /* The following cases are about aggregates. If we are not within a full
6127 initializer already, and there is not a CONSTRUCTOR, it means that there
6128 is a missing set of braces (that is, we are processing the case for
6129 which reshape_init exists). */
6131 {
6133 {
6135 /* There is no need to reshape pointer-to-member function
6136 initializers, as they are always constructed correctly
6137 by the front end. */
6138 ;
6140 /* For a nested compound literal, there is no need to reshape since
6141 brace elision is not allowed. Even if we decided to allow it,
6142 we should add a call to reshape_init in finish_compound_literal,
6143 before calling digest_init, so changing this code would still
6144 not be necessary. */
6146 else
6147 {
6151 }
6152 }
6157 type);
6158 }
6160 /* Dispatch to specialized routines. */
6167 else
6169 }
6171 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
6172 brace-enclosed aggregate initializer.
6174 INIT is the CONSTRUCTOR containing the list of initializers describing
6175 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
6176 It may not presently match the shape of the TYPE; for example:
6178 struct S { int a; int b; };
6179 struct S a[] = { 1, 2, 3, 4 };
6181 Here INIT will hold a vector of four elements, rather than a
6182 vector of two elements, each itself a vector of two elements. This
6183 routine transforms INIT from the former form into the latter. The
6184 revised CONSTRUCTOR node is returned. */
6186 tree
6188 {
6190 reshape_iter d;
6191 tree new_init;
6197 /* An empty constructor does not need reshaping, and it is always a valid
6198 initializer. */
6202 /* Handle [dcl.init.list] direct-list-initialization from
6203 single element of enumeration with a fixed underlying type. */
6205 {
6209 {
6213 }
6214 else
6216 }
6218 /* Recurse on this CONSTRUCTOR. */
6226 /* Make sure all the element of the constructor were used. Otherwise,
6227 issue an error about exceeding initializers. */
6229 {
6233 }
6240 }
6242 /* Verify array initializer. Returns true if errors have been reported. */
6244 bool
6246 {
6249 /* The array type itself need not be complete, because the
6250 initializer may tell us how many elements are in the array.
6251 But, the elements of the array must be complete. */
6253 {
6257 else
6260 }
6261 /* A compound literal can't have variable size. */
6265 {
6268 }
6270 }
6272 /* Subroutine of check_initializer; args are passed down from that function.
6273 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
6275 static tree
6278 {
6281 }
6283 /* Verify INIT (the initializer for DECL), and record the
6284 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
6285 grok_reference_init.
6287 If the return value is non-NULL, it is an expression that must be
6288 evaluated dynamically to initialize DECL. */
6290 static tree
6292 {
6295 tree core_type;
6297 /* Things that are going to be initialized need to have complete
6298 type. */
6302 {
6303 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
6304 it doesn't have storage to be initialized. */
6307 }
6310 /* We will have already complained. */
6314 {
6317 }
6319 {
6324 }
6325 else
6326 /* There is no way to make a variable-sized class type in GNU C++. */
6330 {
6333 {
6335 {
6338 }
6340 {
6342 "scalar object %qD requires one element in "
6346 }
6347 }
6348 }
6351 {
6358 }
6360 ;
6363 {
6365 {
6368 }
6371 tf_warning_or_error);
6372 /* Do not reshape constructors of vectors (they don't need to be
6373 reshaped. */
6375 {
6377 {
6379 tf_warning_or_error);
6381 }
6383 {
6384 /* Don't reshape if the class has constructors. */
6387 "in C++98 %qD must be initialized by "
6389 decl);
6390 }
6392 {
6395 }
6396 else
6397 {
6400 }
6401 }
6405 {
6408 /* We get here with code like `int a (2);' */
6410 tf_warning_or_error);
6411 }
6413 /* If DECL has an array type without a specific bound, deduce the
6414 array size from the initializer. */
6428 {
6431 /* A constructor call is a non-trivial initializer even if
6432 it isn't explicitly written. */
6436 /* If this is a constexpr initializer, expand_default_init will
6437 have returned an INIT_EXPR rather than a CALL_EXPR. In that
6438 case, pull the initializer back out and pass it down into
6439 store_init_value. */
6444 {
6447 /* Don't call digest_init; it's unnecessary and will complain
6448 about aggregate initialization of non-aggregate classes. */
6450 }
6452 {
6453 /* Declared constexpr, but no suitable initializer; massage
6454 init appropriately so we can pass it into store_init_value
6455 for the error. */
6458 {
6462 }
6464 }
6465 else
6467 }
6470 {
6471 /* In aggregate initialization of a variable, each element
6472 initialization is a full-expression because there is no
6473 enclosing expression. */
6488 }
6489 }
6490 else
6491 {
6499 tf_warning_or_error);
6500 }
6506 {
6507 /* We might have set these in cp_finish_decl. */
6510 }
6514 {
6522 else
6526 {
6530 }
6532 }
6535 }
6537 /* If DECL is not a local variable, give it RTL. */
6539 static void
6541 {
6545 /* Set the DECL_ASSEMBLER_NAME for the object. */
6547 {
6548 /* The `register' keyword, when used together with an
6549 asm-specification, indicates that the variable should be
6550 placed in a particular register. */
6552 {
6555 }
6556 else
6557 {
6562 }
6563 }
6565 /* Handle non-variables up front. */
6567 {
6570 }
6572 /* If we see a class member here, it should be a static data
6573 member. */
6575 {
6577 /* An in-class declaration of a static data member should be
6578 external; it is only a declaration, and not a definition. */
6583 }
6585 /* We don't create any RTL for local variables. */
6589 /* We defer emission of local statics until the corresponding
6590 DECL_EXPR is expanded. But with constexpr its function might never
6591 be expanded, so go ahead and tell cgraph about the variable now. */
6596 /* Defer template instantiations. */
6601 /* If we're not deferring, go ahead and assemble the variable. */
6604 }
6606 /* walk_tree helper for wrap_temporary_cleanups, below. */
6608 static tree
6610 {
6611 /* Stop at types or full-expression boundaries. */
6614 {
6617 }
6620 {
6625 /* Tell honor_protect_cleanup_actions to handle this as a separate
6626 cleanup. */
6630 }
6633 }
6635 /* We're initializing a local variable which has a cleanup GUARD. If there
6636 are any temporaries used in the initializer INIT of this variable, we
6637 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
6638 variable will be cleaned up properly if one of them throws.
6640 Unfortunately, there's no way to express this properly in terms of
6641 nesting, as the regions for the temporaries overlap the region for the
6642 variable itself; if there are two temporaries, the variable needs to be
6643 the first thing destroyed if either of them throws. However, we only
6644 want to run the variable's cleanup if it actually got constructed. So
6645 we need to guard the temporary cleanups with the variable's cleanup if
6646 they are run on the normal path, but not if they are run on the
6647 exceptional path. We implement this by telling
6648 honor_protect_cleanup_actions to strip the variable cleanup from the
6649 exceptional path. */
6651 static void
6653 {
6655 }
6657 /* Generate code to initialize DECL (a local variable). */
6659 static void
6661 {
6663 tree cleanup;
6671 {
6672 /* If we used it already as memory, it must stay in memory. */
6676 }
6681 /* Compute and store the initial value. */
6686 /* Generate a cleanup, if necessary. */
6689 /* Perform the initialization. */
6691 {
6695 {
6696 /* Stick simple initializers in DECL_INITIAL so that
6697 -Wno-init-self works (c++/34772). */
6702 {
6706 OPT_Winit_self,
6708 }
6709 }
6710 else
6711 {
6714 /* If we're only initializing a single object, guard the
6715 destructors of any temporaries used in its initializer with
6716 its destructor. This isn't right for arrays because each
6717 element initialization is a full-expression. */
6726 saved_stmts_are_full_exprs_p;
6727 }
6728 }
6730 /* Set this to 0 so we can tell whether an aggregate which was
6731 initialized was ever used. Don't do this if it has a
6732 destructor, so we don't complain about the 'resource
6733 allocation is initialization' idiom. Now set
6734 attribute((unused)) on types so decls of that type will be
6735 marked used. (see TREE_USED, above.) */
6737 && ! already_used
6746 }
6748 /* DECL is a VAR_DECL for a compiler-generated variable with static
6749 storage duration (like a virtual table) whose initializer is a
6750 compile-time constant. Initialize the variable and provide it to the
6751 back end. */
6753 void
6755 {
6756 tree init;
6766 }
6768 /* INIT is the initializer for a variable, as represented by the
6769 parser. Returns true iff INIT is value-dependent. */
6771 static bool
6773 {
6775 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
6778 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
6779 {
6792 }
6793 else
6794 /* It must be a simple expression, e.g., int i = 3; */
6798 }
6800 // Returns true if a DECL is VAR_DECL with the concept specifier.
6803 {
6805 // Not all variables have DECL_LANG_SPECIFIC.
6808 }
6810 /* A helper function to be called via walk_tree. If any label exists
6811 under *TP, it is (going to be) forced. Set has_forced_label_in_static. */
6813 static tree
6815 {
6821 }
6823 /* Finish processing of a declaration;
6824 install its line number and initial value.
6825 If the length of an array type is not known before,
6826 it must be determined now, from the initial value, or it is an error.
6828 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
6829 true, then INIT is an integral constant expression.
6831 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
6832 if the (init) syntax was used. */
6834 void
6837 {
6838 tree type;
6843 tree auto_node;
6848 {
6852 }
6855 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
6862 /* Warn about register storage specifiers except when in GNU global
6863 or local register variable extension. */
6865 {
6868 "ISO C++17 does not allow %<register%> storage "
6870 else
6873 }
6875 /* If a name was specified, get the string. */
6890 {
6891 tree d_init;
6893 {
6897 {
6898 /* init is null because we're deferring instantiating the
6899 initializer until we need it. Well, we need it now. */
6902 }
6905 }
6908 {
6912 tf_warning_or_error);
6914 }
6924 {
6929 }
6931 }
6934 {
6937 {
6940 }
6941 }
6949 {
6950 tree clone;
6952 {
6953 /* FIXME check this is 1st decl. */
6958 {
6962 }
6964 }
6966 {
6969 else
6971 }
6972 }
6975 {
6977 /* If DECL is a reference, then we want to know whether init is a
6978 reference constant; init_const_expr_p as passed tells us whether
6979 it's an rvalue constant. */
6983 {
6984 /* Set these flags now for templates. We'll update the flags in
6985 store_init_value for instantiations. */
6988 /* FIXME setting TREE_CONSTANT on refs breaks the back end. */
6991 }
6992 }
6995 {
6998 /* Add this declaration to the statement-tree. */
7005 {
7008 }
7010 /* Generally, initializers in templates are expanded when the
7011 template is instantiated. But, if DECL is a variable constant
7012 then it can be used in future constant expressions, so its value
7013 must be available. */
7020 {
7023 }
7025 && init_const_expr_p
7029 {
7030 /* This variable seems to be a non-dependent constant, so process
7031 its initializer. If check_initializer returns non-null the
7032 initialization wasn't constant after all. */
7033 tree init_code;
7039 }
7041 {
7042 /* Deduce array size even if the initializer is dependent. */
7044 /* And complain about multiple initializers. */
7048 tf_warning_or_error);
7049 }
7052 {
7056 }
7058 {
7061 }
7063 }
7065 /* Just store non-static data member initializers for later. */
7069 /* Take care of TYPE_DECLs up front. */
7071 {
7074 {
7078 }
7080 /* If we have installed this as the canonical typedef for this
7081 type, and that type has not been defined yet, delay emitting
7082 the debug information for it, as we will emit it later. */
7088 at_eof);
7090 }
7092 /* A reference will be modified here, as it is initialized. */
7096 {
7099 }
7102 {
7103 /* If this is a local variable that will need a mangled name,
7104 register it now. We must do this before processing the
7105 initializer for the variable, since the initialization might
7106 require a guard variable, and since the mangled name of the
7107 guard variable will depend on the mangled name of this
7108 variable. */
7112 {
7114 /* Normally has_forced_label_in_static is set during GIMPLE
7115 lowering, but [cd]tors are never actually compiled directly.
7116 We need to set this early so we can deal with the label
7117 address extension. */
7121 {
7124 }
7125 /* And make sure it's in the symbol table for
7126 c_parse_final_cleanups to find. */
7128 }
7130 /* Convert the initializer to the type of DECL, if we have not
7131 already initialized DECL. */
7133 /* If !DECL_EXTERNAL then DECL is being defined. In the
7134 case of a static data member initialized inside the
7135 class-specifier, there can be an initializer even if DECL
7136 is *not* defined. */
7138 {
7142 /* Handle:
7144 [dcl.init]
7146 The memory occupied by any object of static storage
7147 duration is zero-initialized at program startup before
7148 any other initialization takes place.
7150 We cannot create an appropriate initializer until after
7151 the type of DECL is finalized. If DECL_INITIAL is set,
7152 then the DECL is statically initialized, and any
7153 necessary zero-initialization has already been performed. */
7158 /* Remember that the initialization for this variable has
7159 taken place. */
7161 /* This declaration is the definition of this variable,
7162 unless we are initializing a static data member within
7163 the class specifier. */
7166 }
7167 /* If the variable has an array type, lay out the type, even if
7168 there is no initializer. It is valid to index through the
7169 array, and we must get TYPE_ALIGN set correctly on the array
7170 type. */
7177 /* So decl is a global variable or a static member of a
7178 non local class. Record the types it uses
7179 so that we can decide later to emit debug info for them. */
7181 }
7183 /* Add this declaration to the statement-tree. This needs to happen
7184 after the call to check_initializer so that the DECL_EXPR for a
7185 reference temp is added before the DECL_EXPR for the reference itself. */
7187 {
7188 /* If we're building a variable sized type, and we might be
7189 reachable other than via the top of the current binding
7190 level, then create a new BIND_EXPR so that we deallocate
7191 the object at the right time. */
7196 {
7197 tree bind;
7202 }
7204 }
7206 /* Let the middle end know about variables and functions -- but not
7207 static data members in uninstantiated class templates. */
7209 {
7211 {
7214 }
7216 /* This needs to happen after the linkage is set. */
7220 {
7221 /* If a TREE_READONLY variable needs initialization
7222 at runtime, it is no longer readonly and we need to
7223 avoid MEM_READONLY_P being set on RTL created for it. */
7225 {
7229 }
7233 /* Likewise if it needs destruction. */
7236 }
7240 /* Check for abstractness of the type. Notice that there is no
7241 need to strip array types here since the check for those types
7242 is already done within create_array_type_for_decl. */
7246 /* No initialization required. */
7247 ;
7249 {
7251 {
7253 {
7254 /* An out-of-class default definition is defined at
7255 the point where it is explicitly defaulted. */
7260 }
7261 else
7263 }
7264 /* else no initialization required. */
7265 }
7269 {
7272 }
7273 /* A variable definition. */
7275 /* Initialize the local variable. */
7278 /* If a variable is defined, and then a subsequent
7279 definition with external linkage is encountered, we will
7280 get here twice for the same variable. We want to avoid
7281 calling expand_static_init more than once. For variables
7282 that are not static data members, we can call
7283 expand_static_init only when we actually process the
7284 initializer. It is not legal to redeclare a static data
7285 member, so this issue does not arise in that case. */
7288 }
7290 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
7291 reference, insert it in the statement-tree now. */
7293 {
7298 }
7304 }
7306 /* For class TYPE return itself or some its bases that contain
7307 any direct non-static data members. Return error_mark_node if an
7308 error has been diagnosed. */
7310 static tree
7312 {
7322 {
7326 else
7331 }
7333 {
7341 }
7342 else
7352 {
7357 {
7359 {
7364 }
7368 {
7370 "classes %qT and %qT have non-static data "
7373 }
7374 else
7376 }
7377 }
7379 }
7381 /* Return std::tuple_size<TYPE>::value. */
7383 static tree
7385 {
7401 else
7403 }
7405 /* Return std::tuple_element<I,TYPE>::type. */
7407 static tree
7409 {
7417 tf_warning_or_error);
7420 }
7422 /* Return e.get<i>() or get<i>(e). */
7424 static tree
7426 {
7434 /* [The id-expression] e is an lvalue if the type of the entity e is an
7435 lvalue reference and an xvalue otherwise. */
7444 /* To use a member get, member lookup must find at least one
7445 declaration that is a function template
7446 whose first template parameter is a non-type parameter. */
7448 {
7451 {
7455 {
7458 }
7459 }
7460 }
7463 {
7468 }
7469 else
7470 {
7476 }
7477 }
7479 /* It's impossible to recover the decltype of a tuple decomposition variable
7480 based on the actual type of the variable, so store it in a hash table. */
7483 static void
7485 {
7489 }
7491 tree
7493 {
7495 }
7497 /* Mangle a decomposition declaration if needed. Arguments like
7498 in cp_finish_decomp. */
7500 void
7502 {
7506 {
7514 }
7515 }
7517 /* Finish a decomposition declaration. DECL is the underlying declaration
7518 "e", FIRST is the head of a chain of decls for the individual identifiers
7519 chained through DECL_CHAIN in reverse order and COUNT is the number of
7520 those decls. */
7522 void
7524 {
7526 {
7527 error_out:
7529 {
7532 {
7535 }
7537 }
7541 }
7545 /* This happens for range for when not in templates.
7546 Still add the DECL_VALUE_EXPRs for later processing. */
7547 || (!processing_template_decl
7549 {
7551 {
7553 {
7559 }
7563 }
7565 }
7571 {
7574 }
7580 {
7586 {
7588 type);
7590 }
7591 }
7596 {
7597 tree nelts;
7602 {
7605 }
7608 {
7609 cnt_mismatch:
7614 else
7623 }
7626 {
7634 NULL_TREE);
7637 }
7638 }
7639 /* 2 GNU extensions. */
7641 {
7647 {
7655 t);
7658 }
7659 }
7661 {
7663 {
7666 }
7671 {
7681 NULL_TREE);
7684 }
7685 }
7687 {
7689 {
7693 }
7695 {
7702 }
7708 {
7719 {
7723 }
7724 /* Save the decltype away before reference collapse. */
7730 {
7731 /* In this case the names are variables, not just proxies. */
7734 }
7738 }
7739 /* Ignore reads from the underlying decl performed during initialization
7740 of the individual variables. If those will be read, we'll mark
7741 the underlying decl as read at that point. */
7743 }
7745 {
7748 }
7750 {
7753 }
7755 {
7758 }
7761 type);
7762 else
7763 {
7768 {
7772 }
7778 else
7779 eltscnt++;
7784 {
7788 }
7795 else
7796 {
7798 NULL_TREE);
7804 {
7807 }
7808 i++;
7809 }
7810 }
7812 {
7815 {
7820 }
7821 }
7822 }
7824 /* Returns a declaration for a VAR_DECL as if:
7826 extern "C" TYPE NAME;
7828 had been seen. Used to create compiler-generated global
7829 variables. */
7831 static tree
7833 {
7834 tree decl;
7842 /* If the user has explicitly declared this variable (perhaps
7843 because the code we are compiling is part of a low-level runtime
7844 library), then it is possible that our declaration will be merged
7845 with theirs by pushdecl. */
7851 }
7853 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
7854 if "__cxa_atexit" is not being used) corresponding to the function
7855 to be called when the program exits. */
7857 static tree
7859 {
7860 tree fn_type;
7863 {
7864 tree arg_type;
7867 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
7869 else
7870 /* The parameter to "atexit" is "void (*)(void)". */
7876 }
7879 }
7881 /* Returns a pointer to the `atexit' function. Note that if
7882 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
7883 `__cxa_atexit' function specified in the IA64 C++ ABI. */
7885 static tree
7887 {
7888 tree atexit_fndecl;
7889 tree fn_type;
7890 tree fn_ptr_type;
7898 {
7899 /* The declaration for `__cxa_atexit' is:
7901 int __cxa_atexit (void (*)(void *), void *, void *)
7903 We build up the argument types and then the function type
7904 itself. */
7908 /* First, build the pointer-to-function type for the first
7909 argument. */
7911 /* Then, build the rest of the argument types. */
7914 {
7917 }
7918 else
7919 {
7922 }
7923 /* And the final __cxa_atexit type. */
7926 NULL_TREE);
7929 else
7931 }
7932 else
7933 {
7934 /* The declaration for `atexit' is:
7936 int atexit (void (*)());
7938 We build up the argument types and then the function type
7939 itself. */
7941 /* Build the final atexit type. */
7945 }
7947 /* Now, build the function declaration. */
7955 }
7957 /* Like get_atexit_node, but for thread-local cleanups. */
7959 static tree
7961 {
7962 /* The declaration for `__cxa_thread_atexit' is:
7964 int __cxa_thread_atexit (void (*)(void *), void *, void *) */
7968 NULL_TREE);
7970 /* Now, build the function declaration. */
7974 }
7976 /* Returns the __dso_handle VAR_DECL. */
7978 static tree
7980 {
7984 /* Declare the variable. */
7986 ptr_type_node);
7988 #ifdef HAVE_GAS_HIDDEN
7990 {
7993 }
7994 #endif
7997 }
7999 /* Begin a new function with internal linkage whose job will be simply
8000 to destroy some particular variable. */
8004 static tree
8006 {
8008 tree fntype;
8009 tree fndecl;
8015 /* No need to mangle this. */
8018 /* Build the name of the function. */
8020 /* Build the function declaration. */
8023 /* It's a function with internal linkage, generated by the
8024 compiler. */
8027 /* Make the function `inline' so that it is only emitted if it is
8028 actually needed. It is unlikely that it will be inlined, since
8029 it is only called via a function pointer, but we avoid unnecessary
8030 emissions this way. */
8033 /* Build the parameter. */
8035 {
8040 }
8048 }
8050 /* Finish the cleanup function begun by start_cleanup_fn. */
8052 static void
8054 {
8058 }
8060 /* Generate code to handle the destruction of DECL, an object with
8061 static storage duration. */
8063 tree
8065 {
8066 tree cleanup;
8067 tree addr;
8068 tree compound_stmt;
8069 tree fcall;
8070 tree type;
8073 tree atex_node;
8079 /* If we're using "__cxa_atexit" (or "__cxa_thread_atexit" or
8080 "__aeabi_atexit"), and DECL is a class object, we can just pass the
8081 destructor to "__cxa_atexit"; we don't have to build a temporary
8082 function to do the cleanup. */
8083 dso_parm = (flag_use_cxa_atexit
8088 {
8091 /* Make sure it is accessible. */
8093 tf_warning_or_error);
8094 }
8095 else
8096 {
8097 /* Call build_cleanup before we enter the anonymous function so
8098 that any access checks will be done relative to the current
8099 scope, rather than the scope of the anonymous function. */
8102 /* Now start the function. */
8105 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
8106 to the original function, rather than the anonymous one. That
8107 will make the back end think that nested functions are in use,
8108 which causes confusion. */
8113 /* Create the body of the anonymous function. */
8118 }
8120 /* Call atexit with the cleanup function. */
8126 else
8130 {
8131 /* We must convert CLEANUP to the type that "__cxa_atexit"
8132 expects. */
8134 /* "__cxa_atexit" will pass the address of DECL to the
8135 cleanup function. */
8138 /* The declared type of the parameter to "__cxa_atexit" is
8139 "void *". For plain "T*", we could just let the
8140 machinery in cp_build_function_call convert it -- but if the
8141 type is "cv-qualified T *", then we need to convert it
8142 before passing it in, to avoid spurious errors. */
8144 }
8145 else
8146 /* Since the cleanup functions we build ignore the address
8147 they're given, there's no reason to pass the actual address
8148 in, and, in general, it's cheaper to pass NULL than any
8149 other value. */
8154 tf_warning_or_error);
8156 /* Just pass NULL to the dso handle parm if we don't actually
8157 have a DSO handle on this target. */
8159 else
8163 {
8166 {
8169 }
8170 else
8171 {
8174 }
8175 }
8176 else
8177 {
8180 }
8183 }
8185 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
8186 is its initializer. Generate code to handle the construction
8187 and destruction of DECL. */
8189 static void
8191 {
8195 /* Some variables require no dynamic initialization. */
8197 {
8198 /* Make sure the destructor is callable. */
8202 }
8206 {
8210 else
8215 {
8217 "C++11 %<thread_local%> allows dynamic initialization "
8220 }
8222 }
8225 {
8226 /* Emit code to perform this initialization but once. */
8231 /* We don't need thread-safety code for thread-local vars. */
8235 /* Emit code to perform this initialization but once. This code
8236 looks like:
8238 static <type> guard;
8239 if (!__atomic_load (guard.first_byte)) {
8240 if (__cxa_guard_acquire (&guard)) {
8241 bool flag = false;
8242 try {
8243 // Do initialization.
8244 flag = true; __cxa_guard_release (&guard);
8245 // Register variable for destruction at end of program.
8246 } catch {
8247 if (!flag) __cxa_guard_abort (&guard);
8248 }
8249 }
8250 }
8252 Note that the `flag' variable is only set to 1 *after* the
8253 initialization is complete. This ensures that an exception,
8254 thrown during the construction, will cause the variable to
8255 reinitialized when we pass through this code again, as per:
8257 [stmt.dcl]
8259 If the initialization exits by throwing an exception, the
8260 initialization is not complete, so it will be tried again
8261 the next time control enters the declaration.
8263 This process should be thread-safe, too; multiple threads
8264 should not be able to initialize the variable more than
8265 once. */
8267 /* Create the guard variable. */
8270 /* Begin the conditional initialization. */
8277 {
8290 acquire_fn = push_library_fn
8293 NULL_TREE),
8298 NULL_TREE);
8308 inner_if_stmt);
8316 void_node,
8320 /* Do the initialization itself. */
8322 init = add_stmt_to_compound
8324 init = add_stmt_to_compound
8326 }
8327 else
8330 /* Use atexit to register a function for destroying this static
8331 variable. */
8337 {
8341 }
8346 }
8349 else
8351 }
8353 \f
8354 /* Make TYPE a complete type based on INITIAL_VALUE.
8355 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
8356 2 if there was no information (in which case assume 0 if DO_DEFAULT),
8357 3 if the initializer list is empty (in pedantic mode). */
8359 int
8361 {
8365 /* Don't get confused by a CONSTRUCTOR for some other type. */
8372 {
8374 tree value;
8376 /* An array of character type can be initialized from a
8377 brace-enclosed string constant.
8379 FIXME: this code is duplicated from reshape_init. Probably
8380 we should just call reshape_init here? */
8384 {
8391 }
8393 /* If any of the elements are parameter packs, we can't actually
8394 complete this type now because the array size is dependent. */
8396 {
8399 {
8402 }
8403 }
8404 }
8408 /* We can create the array before the element type is complete, which
8409 means that we didn't have these two bits set in the original type
8410 either. In completing the type, we are expected to propagate these
8411 bits. See also complete_type which does the same thing for arrays
8412 of fixed size. */
8415 {
8420 }
8423 }
8425 /* As above, but either give an error or reject zero-size arrays, depending
8426 on COMPLAIN. */
8428 int
8431 {
8434 /* In SFINAE context we can't be lenient about zero-size arrays. */
8441 {
8447 {
8450 }
8454 }
8456 }
8457 \f
8458 /* Return zero if something is declared to be a member of type
8459 CTYPE when in the context of CUR_TYPE. STRING is the error
8460 message to print in that case. Otherwise, quietly return 1. */
8462 static int
8464 {
8466 {
8469 else
8472 }
8474 }
8475 \f
8476 /* Subroutine of `grokdeclarator'. */
8478 /* Generate errors possibly applicable for a given set of specifiers.
8479 This is for ARM $7.1.2. */
8481 static void
8489 {
8491 {
8528 }
8532 && !flag_noexcept_type
8538 }
8540 /* DECL is a member function or static data member and is presently
8541 being defined. Check that the definition is taking place in a
8542 valid namespace. */
8544 static void
8546 {
8547 /* These checks only apply to member functions and static data
8548 members. */
8550 /* We check for problems with specializations in pt.c in
8551 check_specialization_namespace, where we can issue better
8552 diagnostics. */
8555 /* We check this in check_explicit_instantiation_namespace. */
8558 /* [class.mfct]
8560 A member function definition that appears outside of the
8561 class definition shall appear in a namespace scope enclosing
8562 the class definition.
8564 [class.static.data]
8566 The definition for a static data member shall appear in a
8567 namespace scope enclosing the member's class definition. */
8571 }
8573 /* Build a PARM_DECL for the "this" parameter of FN. TYPE is the
8574 METHOD_TYPE for a non-static member function; QUALS are the
8575 cv-qualifiers that apply to the function. */
8577 tree
8579 {
8580 tree this_type;
8581 tree qual_type;
8582 tree parm;
8583 cp_cv_quals this_quals;
8586 {
8587 this_type
8590 }
8591 else
8593 /* The `this' parameter is implicitly `const'; it cannot be
8594 assigned to. */
8600 }
8602 /* DECL is a static member function. Complain if it was declared
8603 with function-cv-quals. */
8605 static void
8607 {
8610 decl);
8611 }
8613 // Check that FN takes no arguments and returns bool.
8614 static void
8616 {
8617 // A constraint is nullary.
8621 // The declared return type of the concept shall be bool, and
8622 // it shall not be deduced from it definition.
8628 }
8630 /* Helper function. Replace the temporary this parameter injected
8631 during cp_finish_omp_declare_simd with the real this parameter. */
8633 static tree
8635 {
8644 }
8646 /* CTYPE is class type, or null if non-class.
8647 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
8648 or METHOD_TYPE.
8649 DECLARATOR is the function's name.
8650 PARMS is a chain of PARM_DECLs for the function.
8651 VIRTUALP is truthvalue of whether the function is virtual or not.
8652 FLAGS are to be passed through to `grokclassfn'.
8653 QUALS are qualifiers indicating whether the function is `const'
8654 or `volatile'.
8655 RAISES is a list of exceptions that this function can raise.
8656 CHECK is 1 if we must find this method in CTYPE, 0 if we should
8657 not look, and -1 if we should not call `grokclassfn' at all.
8659 SFK is the kind of special function (if any) for the new function.
8661 Returns `NULL_TREE' if something goes wrong, after issuing
8662 applicable error messages. */
8664 static tree
8666 tree type,
8667 tree declarator,
8668 tree parms,
8669 tree orig_declarator,
8670 tree decl_reqs,
8673 cp_cv_quals quals,
8674 cp_ref_qualifier rqual,
8675 tree raises,
8681 special_function_kind sfk,
8684 tree in_namespace,
8686 location_t location)
8687 {
8688 tree decl;
8690 tree t;
8692 // Was the concept specifier present?
8695 // Concept declarations must have a corresponding definition.
8697 {
8700 }
8709 /* Set the constraints on the declaration. */
8711 {
8716 /* Adjust the required expression into a constraint. */
8722 }
8724 /* If we have an explicit location, use it, otherwise use whatever
8725 build_lang_decl used (probably input_location). */
8730 {
8735 /* Allocate space to hold the vptr bit if needed. */
8737 }
8743 /* Propagate volatile out from type to decl. */
8747 /* Setup decl according to sfk. */
8749 {
8762 }
8765 {
8768 orig_declarator);
8769 else
8770 {
8775 {
8776 /* Something like `template <class T> friend void f<T>()'. */
8779 orig_declarator);
8781 }
8784 /* A friend declaration of the form friend void f<>(). Record
8785 the information in the TEMPLATE_ID_EXPR. */
8794 {
8797 decl);
8799 }
8802 {
8805 decl);
8807 }
8808 }
8809 }
8811 /* If this decl has namespace scope, set that up. */
8817 /* `main' and builtins have implicit 'C' linkage. */
8832 /* Should probably propagate const out from type to decl I bet (mrs). */
8834 {
8837 }
8843 {
8847 }
8850 {
8861 }
8863 /* Members of anonymous types and local classes have no linkage; make
8864 them internal. If a typedef is made later, this will be changed. */
8870 {
8871 /* [basic.link]: A name with no linkage (notably, the name of a class
8872 or enumeration declared in a local scope) shall not be used to
8873 declare an entity with linkage.
8875 DR 757 relaxes this restriction for C++0x. */
8877 }
8881 {
8884 }
8886 /* If the declaration was declared inline, mark it as such. */
8888 {
8892 }
8896 // If the concept declaration specifier was found, check
8897 // that the declaration satisfies the necessary requirements.
8899 {
8902 }
8906 {
8909 TYPE_UNQUALIFIED,
8910 REF_QUAL_NONE);
8913 {
8917 decl);
8919 }
8922 {
8926 decl);
8928 }
8929 }
8932 {
8934 {
8938 }
8942 }
8947 {
8951 /* [over.literal]/6: Literal operators shall not have C linkage. */
8953 {
8957 }
8960 {
8963 {
8966 }
8970 {
8974 }
8976 {
8980 }
8981 /* 17.6.3.3.5 */
8986 "literal operator suffixes not preceded by %<_%>"
8988 }
8989 else
8990 {
8993 }
8994 }
8997 /* Make the init_value nonzero so pushdecl knows this is not
8998 tentative. error_mark_node is replaced later with the BLOCK. */
9005 {
9006 /* Adjust "omp declare simd" attributes. */
9009 {
9010 tree attr;
9013 {
9018 {
9020 cl = c_omp_declare_simd_clauses_to_numbers
9024 else
9026 }
9027 }
9028 }
9029 }
9031 /* Caller will do the rest of this. */
9038 /* 12.4/3 */
9046 template_count,
9058 {
9061 }
9063 /* Check main's type after attributes have been applied. */
9065 {
9067 integer_type_node))
9068 {
9070 tree newtype;
9074 }
9077 }
9080 {
9082 (processing_template_decl
9084 ? current_template_parms
9091 {
9092 tree ok;
9093 tree pushed_scope;
9096 /* Because grokfndecl is always supposed to return a
9097 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
9098 here. We depend on our callers to figure out that its
9099 really a template that's being returned. */
9104 {
9105 /* Remove the `this' parm added by grokclassfn. */
9108 }
9110 {
9113 }
9115 {
9120 }
9122 /* Since we've smashed OLD_DECL to its
9123 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
9127 /* Attempt to merge the declarations. This can fail, in
9128 the case of some invalid specialization declarations. */
9134 {
9138 }
9142 }
9143 }
9155 }
9157 /* decl is a FUNCTION_DECL.
9158 specifiers are the parsed virt-specifiers.
9160 Set flags to reflect the virt-specifiers.
9162 Returns decl. */
9164 static tree
9166 {
9174 }
9176 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
9177 the linkage that DECL will receive in the object file. */
9179 static void
9181 {
9182 /* A static data member always has static storage duration and
9183 external linkage. Note that static data members are forbidden in
9184 local classes -- the only situation in which a class has
9185 non-external linkage. */
9188 /* For non-template classes, static data members are always put
9189 out in exactly those files where they are defined, just as
9190 with ordinary namespace-scope variables. */
9193 }
9195 /* Create a VAR_DECL named NAME with the indicated TYPE.
9197 If SCOPE is non-NULL, it is the class type or namespace containing
9198 the variable. If SCOPE is NULL, the variable should is created in
9199 the innermost enclosing scope. */
9201 static tree
9203 tree name,
9204 tree orig_declarator,
9211 tree scope)
9212 {
9213 tree decl;
9214 tree explicit_scope;
9221 /* Compute the scope in which to place the variable, but remember
9222 whether or not that scope was explicitly specified by the user. */
9225 {
9226 /* An explicit "extern" specifier indicates a namespace-scope
9227 variable. */
9232 }
9236 template, we need DECL_LANG_SPECIFIC. */
9238 /* Similarly for namespace-scope variables with language linkage
9239 other than C++. */
9242 /* Similarly for static data members. */
9244 /* Similarly for explicit specializations. */
9245 || (orig_declarator
9248 else
9253 else
9257 {
9260 }
9263 {
9265 /* This function is only called with out-of-class definitions. */
9268 }
9269 /* At top level, either `static' or no s.c. makes a definition
9270 (perhaps tentative), and absence of `static' makes it public. */
9272 {
9275 || ! constp
9276 || volatilep
9279 }
9280 /* Not at top level, only `static' makes a static definition. */
9281 else
9282 {
9285 }
9288 {
9290 {
9294 }
9297 }
9299 /* If the type of the decl has no linkage, make sure that we'll
9300 notice that in mark_used. */
9309 {
9310 /* [basic.link]: A name with no linkage (notably, the name of a class
9311 or enumeration declared in a local scope) shall not be used to
9312 declare an entity with linkage.
9314 DR 757 relaxes this restriction for C++0x. */
9317 }
9318 else
9326 /* Check that the variable can be safely declared as a concept.
9327 Note that this also forbids explicit specializations. */
9329 {
9331 {
9334 }
9335 else
9340 }
9343 {
9347 }
9349 // Handle explicit specializations and instantiations of variable templates.
9355 }
9357 /* Create and return a canonical pointer to member function type, for
9358 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
9360 tree
9362 {
9364 tree t;
9369 /* Make sure that we always have the unqualified pointer-to-member
9370 type first. */
9372 {
9375 }
9377 /* If a canonical type already exists for this type, use it. We use
9378 this method instead of type_hash_canon, because it only does a
9379 simple equality check on the list of field members. */
9387 /* Let the front end know this is a pointer to member function. */
9394 delta_type_node);
9400 /* Zap out the name so that the back end will give us the debugging
9401 information for this anonymous RECORD_TYPE. */
9404 /* Cache this pointer-to-member type so that we can find it again
9405 later. */
9414 }
9416 /* Create and return a pointer to data member type. */
9418 tree
9420 {
9422 {
9427 }
9428 else
9429 {
9432 }
9433 }
9435 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
9436 Check to see that the definition is valid. Issue appropriate error
9437 messages. Return 1 if the definition is particularly bad, or 0
9438 otherwise. */
9440 static int
9442 {
9443 /* Avoid redundant diagnostics on out-of-class definitions. */
9446 /* Can't check yet if we don't know the type. */
9449 /* If DECL is declared constexpr, we'll do the appropriate checks
9450 in check_initializer. Similarly for inline static data members. */
9456 {
9459 "in-class initialization of static data member %q#D of "
9463 "%<constexpr%> needed for in-class initialization of "
9465 else
9467 "in-class initialization of static data member %q#D of "
9470 }
9472 /* Motion 10 at San Diego: If a static const integral data member is
9473 initialized with an integral constant expression, the initializer
9474 may appear either in the declaration (within the class), or in
9475 the definition, but not both. If it appears in the class, the
9476 member is a member constant. The file-scope definition is always
9477 required. */
9479 {
9481 "invalid in-class initialization of static data member "
9483 type);
9485 }
9488 "ISO C++ forbids in-class initialization of non-const "
9490 decl);
9493 "ISO C++ forbids initialization of member constant "
9497 }
9499 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
9500 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
9501 expressions out into temporary variables so that walk_tree doesn't
9502 step into them (c++/15764). */
9504 static tree
9506 {
9510 {
9516 }
9520 }
9522 /* Entry point for the above. */
9524 static void
9526 {
9528 /* Break out any function calls into temporary variables. */
9530 }
9532 /* Reduce a SIZEOF_EXPR to its value. */
9534 tree
9536 {
9537 tree r;
9544 else
9550 }
9552 /* Given the SIZE (i.e., number of elements) in an array, compute
9553 an appropriate index type for the array. If non-NULL, NAME is
9554 the name of the entity being declared. */
9556 tree
9558 {
9559 tree itype;
9566 {
9571 /* In C++98, we mark a non-constant array bound with a magic
9573 else
9574 {
9581 }
9586 /* The array bound must be an integer type. */
9589 {
9594 else
9597 }
9598 }
9600 /* A type is dependent if it is...an array type constructed from any
9601 dependent type or whose size is specified by a constant expression
9602 that is value-dependent. */
9603 /* We can only call value_dependent_expression_p on integral constant
9604 expressions; treat non-constant expressions as dependent, too. */
9608 {
9609 /* We cannot do any checking for a SIZE that isn't known to be
9610 constant. Just build the index type and mark that it requires
9611 structural equality checks. */
9618 }
9621 {
9626 /* Use the folded result for VLAs, too; it will have resolved
9627 SIZEOF_EXPR. */
9629 }
9631 /* Normally, the array-bound will be a constant. */
9633 {
9634 /* An array must have a positive number of elements. */
9636 {
9642 else
9645 }
9646 /* As an extension we allow zero-sized arrays. */
9648 {
9650 /* We must fail if performing argument deduction (as
9651 indicated by the state of complain), so that
9652 another substitution can be found. */
9658 else
9660 }
9661 }
9663 /* We don't allow VLAs at non-function scopes, or during
9664 tentative template substitution. */
9667 {
9670 /* `(int) &fn' is not a valid array bound. */
9673 name);
9674 else
9677 }
9679 {
9682 else
9684 }
9686 {
9690 else
9693 }
9696 /* A variable sized array. */
9698 else
9699 {
9700 /* Compute the index of the largest element in the array. It is
9701 one less than the number of elements in the array. We save
9702 and restore PROCESSING_TEMPLATE_DECL so that computations in
9703 cp_build_binary_op will be appropriately folded. */
9704 {
9705 processing_template_decl_sentinel s;
9707 MINUS_EXPR,
9710 complain),
9711 complain);
9713 }
9716 {
9717 /* A variable sized array. */
9724 {
9725 /* We have to add 1 -- in the ubsan routine we generate
9726 LE_EXPR rather than LT_EXPR. */
9731 }
9732 }
9733 /* Make sure that there was no overflow when creating to a signed
9734 index type. (For example, on a 32-bit machine, an array with
9735 size 2^32 - 1 is too big.) */
9738 {
9743 }
9744 }
9746 /* Create and return the appropriate index type. */
9749 /* If the index type were dependent, we would have returned early, so
9750 remember that it isn't. */
9754 }
9756 /* Returns the scope (if any) in which the entity declared by
9757 DECLARATOR will be located. If the entity was declared with an
9758 unqualified name, NULL_TREE is returned. */
9760 tree
9762 {
9766 /* If the declarator-id is a SCOPE_REF, the scope in which the
9767 declaration occurs is the first operand. */
9772 /* Otherwise, the declarator is not a qualified name; the entity will
9773 be declared in the current scope. */
9775 }
9777 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
9778 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
9779 with this type. */
9781 static tree
9783 {
9786 /* If things have already gone awry, bail now. */
9790 /* 8.3.4/1: If the type of the identifier of D contains the auto
9791 type-specifier, the program is ill-formed. */
9793 {
9796 }
9798 /* If there are some types which cannot be array elements,
9799 issue an error-message and return. */
9801 {
9805 else
9812 else
9819 else
9826 else
9832 }
9834 /* [dcl.array]
9836 The constant expressions that specify the bounds of the arrays
9837 can be omitted only for the first member of the sequence. */
9839 {
9843 name);
9844 else
9849 }
9851 /* Figure out the index type for the array. */
9855 /* [dcl.array]
9856 T is called the array element type; this type shall not be [...] an
9857 abstract class type. */
9861 }
9863 /* Returns the smallest location != UNKNOWN_LOCATION among the
9864 three stored in LOCATIONS[ds_const], LOCATIONS[ds_volatile],
9865 and LOCATIONS[ds_restrict]. */
9867 static location_t
9869 {
9884 }
9886 /* Check that it's OK to declare a function with the indicated TYPE
9887 and TYPE_QUALS. SFK indicates the kind of special function (if any)
9888 that this function is. OPTYPE is the type given in a conversion
9889 operator declaration, or the class type for a constructor/destructor.
9890 Returns the actual return type of the function; that may be different
9891 than TYPE if an error occurs, or for certain special functions. */
9893 static tree
9895 tree type,
9896 tree optype,
9899 {
9901 {
9911 else
9922 /* We can't use the proper return type here because we run into
9923 problems with ambiguous bases and covariant returns. */
9926 else
9935 "qualifiers are not allowed on declaration of "
9946 "qualifiers are not allowed on declaration of "
9949 {
9953 }
9954 else
9964 }
9967 }
9969 /* A variable or data member (whose unqualified name is IDENTIFIER)
9970 has been declared with the indicated TYPE. If the TYPE is not
9971 acceptable, issue an error message and return a type to use for
9972 error-recovery purposes. */
9974 tree
9976 {
9978 {
9982 {
9985 }
9986 else
9989 }
9992 }
9994 /* Handle declaring DECL as an inline variable. */
9996 static void
9998 {
10001 {
10005 }
10008 "inline variables are only available "
10011 {
10014 }
10015 }
10018 /* Assign a typedef-given name to a class or enumeration type declared
10019 as anonymous at first. This was split out of grokdeclarator
10020 because it is also used in libcc1. */
10022 void
10024 {
10027 /* Replace the anonymous name with the real name everywhere. */
10029 {
10031 /* We do not rename the debug info representing the
10032 unnamed tagged type because the standard says in
10033 [dcl.typedef] that the naming applies only for
10034 linkage purposes. */
10035 /*debug_hooks->set_name (t, decl);*/
10037 }
10042 /* If this is a typedef within a template class, the nested
10043 type is a (non-primary) template. The name for the
10044 template needs updating as well. */
10049 /* Adjust linkage now that we aren't unnamed anymore. */
10052 /* FIXME remangle member functions; member functions of a
10053 type with external linkage have external linkage. */
10055 /* Check that our job is done, and that it would fail if we
10056 attempted to do it again. */
10058 }
10060 /* Given declspecs and a declarator (abstract or otherwise), determine
10061 the name and type of the object declared and construct a DECL node
10062 for it.
10064 DECLSPECS points to the representation of declaration-specifier
10065 sequence that precedes declarator.
10067 DECL_CONTEXT says which syntactic context this declaration is in:
10068 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
10069 FUNCDEF for a function definition. Like NORMAL but a few different
10070 error messages in each case. Return value may be zero meaning
10071 this definition is too screwy to try to parse.
10072 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
10073 handle member functions (which have FIELD context).
10074 Return value may be zero meaning this definition is too screwy to
10075 try to parse.
10076 PARM for a parameter declaration (either within a function prototype
10077 or before a function body). Make a PARM_DECL, or return void_type_node.
10078 TPARM for a template parameter declaration.
10079 CATCHPARM for a parameter declaration before a catch clause.
10080 TYPENAME if for a typename (in a cast or sizeof).
10081 Don't make a DECL node; just return the ..._TYPE node.
10082 FIELD for a struct or union field; make a FIELD_DECL.
10083 BITFIELD for a field with specified width.
10085 INITIALIZED is as for start_decl.
10087 ATTRLIST is a pointer to the list of attributes, which may be NULL
10088 if there are none; *ATTRLIST may be modified if attributes from inside
10089 the declarator should be applied to the declaration.
10091 When this function is called, scoping variables (such as
10092 CURRENT_CLASS_TYPE) should reflect the scope in which the
10093 declaration occurs, not the scope in which the new declaration will
10094 be placed. For example, on:
10096 void S::f() { ... }
10098 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
10099 should not be `S'.
10101 Returns a DECL (if a declarator is present), a TYPE (if there is no
10102 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
10103 error occurs. */
10105 tree
10111 {
10123 /* True if this declarator is a function definition. */
10127 #if 0
10128 /* See the code below that used this. */
10130 #endif
10132 /* Keep track of what sort of function is being processed
10133 so that we can warn about default return values, or explicit
10134 return values which do not match prescribed defaults. */
10140 /* cv-qualifiers that apply to the declarator, for a declaration of
10141 a member function. */
10143 /* virt-specifiers that apply to the declarator, for a declaration of
10144 a member function. */
10146 /* ref-qualifier that applies to the declarator, for a declaration of
10147 a member function. */
10149 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
10156 /* The unqualified name of the declarator; either an
10157 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
10158 tree unqualified_id;
10159 /* The class type, if any, in which this entity is located,
10160 or NULL_TREE if none. Note that this value may be different from
10161 the current class type; for example if an attempt is made to declare
10162 "A::f" inside "B", this value will be "A". */
10164 /* The NAMESPACE_DECL for the namespace in which this entity is
10165 located. If an unqualified name is used to declare the entity,
10166 this value will be NULL_TREE, even if the entity is located at
10167 namespace scope. */
10169 cp_storage_class storage_class;
10190 // Was concept_p specified? Note that ds_concept
10191 // implies ds_constexpr!
10224 /* Look inside a declarator for the name being declared
10225 and get it as a string, for an error message. */
10227 id_declarator;
10229 {
10234 {
10238 {
10242 }
10246 {
10252 {
10254 {
10255 /* [dcl.meaning]
10257 A declarator-id shall not be qualified except
10258 for ...
10260 None of the cases are permitted in block
10261 scope. */
10264 decl);
10268 else
10272 }
10274 {
10277 {
10280 }
10282 && current_class_type
10284 current_class_type))
10285 {
10289 }
10290 }
10293 }
10295 {
10297 {
10299 {
10302 }
10305 {
10308 }
10315 }
10319 {
10325 }
10326 /* Fall through. */
10333 {
10335 dname);
10337 }
10340 else
10341 {
10348 else
10350 }
10355 }
10357 }
10374 }
10377 }
10379 /* [dcl.fct.edf]
10381 The declarator in a function-definition shall have the form
10382 D1 ( parameter-declaration-clause) ... */
10384 {
10387 }
10392 {
10395 }
10398 {
10401 {
10404 }
10407 {
10409 {
10412 }
10414 {
10417 }
10418 }
10419 }
10421 /* Anything declared one level down from the top level
10422 must be one of the parameters of a function
10423 (because the body is at least two levels down). */
10425 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
10426 by not allowing C++ class definitions to specify their parameters
10427 with xdecls (must be spec.d in the parmlist).
10429 Since we now wait to push a class scope until we are sure that
10430 we are in a legitimate method context, we must set oldcname
10431 explicitly (since current_class_name is not yet alive).
10433 We also want to avoid calling this a PARM if it is in a namespace. */
10436 {
10442 }
10448 {
10451 }
10454 {
10457 }
10459 /* If there were multiple types specified in the decl-specifier-seq,
10460 issue an error message. */
10462 {
10465 }
10468 {
10471 }
10473 /* Extract the basic type from the decl-specifier-seq. */
10476 {
10479 }
10480 /* If the entire declaration is itself tagged as deprecated then
10481 suppress reports of deprecated items. */
10486 {
10493 }
10494 /* No type at all: default to `int', and set DEFAULTED_INT
10495 because it was not a user-defined typedef. */
10497 {
10499 {
10500 /* These imply 'int'. */
10503 }
10504 /* If we just have "complex", it is equivalent to "complex double". */
10507 {
10510 "ISO C++ does not support plain %<complex%> meaning "
10512 }
10513 }
10514 /* Gather flags. */
10518 #if 0
10519 /* See the code below that used this. */
10522 #endif
10527 else
10531 {
10533 ctor_return_type,
10534 type_quals,
10537 }
10539 {
10544 /* We handle `main' specially here, because 'main () { }' is so
10545 common. With no options, it is allowed. With -Wreturn-type,
10546 it is a warning. It is only an error with -pedantic-errors. */
10547 is_main = (funcdef_flag
10563 else
10568 /* FIXME we should be able to propagate the error_mark_node as is
10569 for other contexts too. */
10571 else
10573 }
10578 {
10580 {
10584 }
10589 }
10591 /* Now process the modifiers that were specified
10592 and check for invalid combinations. */
10594 /* Long double is a special combination. */
10596 {
10600 }
10602 /* Check all other uses of type modifiers. */
10605 {
10627 {
10632 }
10633 else
10634 {
10637 {
10640 name);
10643 }
10644 }
10646 /* Discard the type modifiers if they are invalid. */
10648 {
10654 }
10655 }
10657 /* Decide whether an integer type is signed or not.
10658 Optionally treat bitfields as signed by default. */
10660 /* [class.bit]
10662 It is implementation-defined whether a plain (neither
10663 explicitly signed or unsigned) char, short, int, or long
10664 bit-field is signed or unsigned.
10666 Naturally, we extend this to long long as well. Note that
10667 this does not include wchar_t. */
10669 && !signed_p
10670 /* A typedef for plain `int' without `signed' can be
10671 controlled just like plain `int', but a typedef for
10672 `signed int' cannot be so controlled. */
10673 && !(typedef_decl
10677 {
10690 else
10692 }
10705 {
10708 /* If a modifier is specified, the resulting complex is the complex
10709 form of TYPE. E.g, "complex short" is "complex short int". */
10718 else
10720 }
10722 /* If we're using the injected-class-name to form a compound type or a
10723 declaration, replace it with the underlying class so we don't get
10724 redundant typedefs in the debug output. But if we are returning the
10725 type unchanged, leave it alone so that it's available to
10726 maybe_get_template_decl_from_type_decl. */
10734 type = cp_build_qualified_type_real
10738 /* We might have ignored or rejected some of the qualifiers. */
10745 {
10749 }
10761 {
10763 {
10768 }
10772 }
10775 /* Issue errors about use of storage classes for parameters. */
10777 {
10779 {
10782 }
10784 {
10787 }
10793 /* Function parameters cannot be concept. */
10796 /* Function parameters cannot be constexpr. If we saw one, moan
10797 and pretend it wasn't there. */
10799 {
10802 }
10803 }
10805 /* Give error if `virtual' is used outside of class declaration. */
10808 {
10812 }
10815 {
10830 declspecs->gnu_thread_keyword_p
10836 {
10861 }
10864 {
10866 {
10870 "type must be cv-qualified %<auto%> or reference to "
10872 }
10875 }
10885 }
10887 /* Static anonymous unions are dealt with here. */
10893 /* Warn about storage classes that are invalid for certain
10894 kinds of declarations (parameters, typenames, etc.). */
10896 && ((storage_class
10900 {
10903 }
10908 {
10912 ;
10914 ;
10916 /* C++ allows static class elements. */
10918 /* C++ also allows inlines and signed and unsigned elements,
10919 but in those cases we don't come in here. */
10920 ;
10921 else
10922 {
10925 else
10926 {
10929 else
10931 }
10937 }
10938 }
10943 {
10946 }
10950 {
10955 /* When thread_local is applied to a variable of block scope the
10956 storage-class-specifier static is implied if it does not appear
10957 explicitly. */
10960 }
10963 {
10967 }
10971 else
10972 {
10975 {
10988 }
10989 }
10992 {
10997 }
10999 /* Determine the type of the entity declared by recurring on the
11000 declarator. */
11002 {
11004 tree attrs;
11011 {
11023 attr_flags);
11024 }
11028 /* We don't want to warn in parameter context because we don't
11029 yet know if the parse will succeed, and this might turn out
11030 to be a constructor call. */
11033 && !typedef_p
11035 /* If the type is class-like and the inner name used a
11036 global namespace qualifier, we need the parens.
11037 Unfortunately all we can tell is whether a qualified name
11038 was used or not. */
11039 && !(inner_declarator
11050 {
11058 /* [dcl.array]/1:
11060 The optional attribute-specifier-seq appertains to the
11061 array. */
11067 {
11068 tree arg_types;
11071 /* Declaring a function type. */
11077 /* Pick up type qualifiers which should be applied to `this'. */
11079 /* Pick up virt-specifiers. */
11081 /* And ref-qualifier, too */
11083 /* And tx-qualifier. */
11085 /* Pick up the exception specifications. */
11087 /* If the exception-specification is ill-formed, let's pretend
11088 there wasn't one. */
11096 /* Say it's a definition only for the CALL_EXPR
11097 closest to the identifier. */
11100 /* Handle a late-specified return type. */
11103 {
11105 {
11107 {
11112 {
11114 "%<auto%> type specifier without trailing "
11117 "only available with -std=c++14 or "
11119 }
11121 {
11125 }
11126 }
11128 {
11133 }
11139 {
11141 {
11148 }
11150 {
11152 "for %qT must have trailing return "
11157 }
11163 else
11167 }
11168 }
11171 {
11173 /* Not using maybe_warn_cpp0x because this should
11174 always be an error. */
11177 else
11181 }
11182 }
11188 {
11191 }
11194 {
11198 /* We now know that the TYPE_QUALS don't apply to the
11199 decl, but to its return type. */
11201 }
11203 /* Error about some types functions can't return. */
11206 {
11210 }
11212 {
11216 }
11220 && funcdecl_p
11226 {
11227 /* We are within a class's scope. If our declarator name
11228 is the same as the class name, and we are defining
11229 a function, then it is a constructor/destructor, and
11230 therefore returns a void type. */
11232 /* ISO C++ 12.4/2. A destructor may not be declared
11233 const or volatile. A destructor may not be static.
11234 A destructor may not be declared with ref-qualifier.
11236 ISO C++ 12.1. A constructor may not be declared
11237 const or volatile. A constructor may not be
11238 virtual. A constructor may not be static.
11239 A constructor may not be declared with ref-qualifier. */
11245 {
11250 }
11253 {
11259 }
11263 current_class_type,
11264 flags))
11268 {
11269 /* It's a constructor. */
11273 {
11277 }
11281 }
11284 }
11286 {
11288 {
11289 /* Cannot be both friend and virtual. */
11292 }
11298 name);
11299 }
11301 {
11303 {
11306 }
11309 }
11311 {
11314 }
11321 pushed_scope
11333 {
11337 }
11343 {
11345 /* transaction_safe applies to the type, but
11346 transaction_safe_dynamic applies to the function. */
11349 else
11351 }
11353 /* [dcl.fct]/2:
11355 The optional attribute-specifier-seq appertains to
11356 the function type. */
11361 }
11367 /* Filter out pointers-to-references and references-to-references.
11368 We can get these if a TYPE_DECL is used. */
11371 {
11373 {
11376 }
11378 /* In C++0x, we allow reference to reference declarations
11379 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
11380 and template type arguments [14.3.1/4 temp.arg.type]. The
11381 check for direct reference to reference declarations, which
11382 are still forbidden, occurs below. Reasoning behind the change
11383 can be found in DR106, DR540, and the rvalue reference
11384 proposals. */
11386 {
11389 }
11390 }
11392 {
11397 }
11399 /* We now know that the TYPE_QUALS don't apply to the decl,
11400 but to the target of the pointer. */
11403 /* This code used to handle METHOD_TYPE, but I don't think it's
11404 possible to get it here anymore. */
11408 {
11412 memfn_quals,
11413 rqual);
11419 }
11427 type);
11429 /* When the pointed-to type involves components of variable size,
11430 care must be taken to ensure that the size evaluation code is
11431 emitted early enough to dominate all the possible later uses
11432 and late enough for the variables on which it depends to have
11433 been assigned.
11435 This is expected to happen automatically when the pointed-to
11436 type has a name/declaration of it's own, but special attention
11437 is required if the type is anonymous.
11439 We handle the NORMAL and FIELD contexts here by inserting a
11440 dummy statement that just evaluates the size at a safe point
11441 and ensures it is not deferred until e.g. within a deeper
11442 conditional context (c++/43555).
11444 We expect nothing to be needed here for PARM or TYPENAME.
11445 Evaluating the size at this point for TYPENAME would
11446 actually be incorrect, as we might be in the middle of an
11447 expression with side effects on the pointed-to type size
11448 "arguments" prior to the pointer declaration point and the
11449 size evaluation could end up prior to the side effects. */
11455 {
11459 }
11462 {
11463 /* In C++0x, the type we are creating a reference to might be
11464 a typedef which is itself a reference type. In that case,
11465 we follow the reference collapsing rules in
11466 [7.1.3/8 dcl.typedef] to create the final reference type:
11468 "If a typedef TD names a type that is a reference to a type
11469 T, an attempt to create the type 'lvalue reference to cv TD'
11470 creates the type 'lvalue reference to T,' while an attempt
11471 to create the type "rvalue reference to cv TD' creates the
11472 type TD."
11473 */
11477 {
11480 else
11482 }
11483 else
11484 type = cp_build_reference_type
11487 /* In C++0x, we need this check for direct reference to
11488 reference declarations, which are forbidden by
11489 [8.3.2/5 dcl.ref]. Reference to reference declarations
11490 are only allowed indirectly through typedefs and template
11491 type arguments. Example:
11493 void foo(int & &); // invalid ref-to-ref decl
11495 typedef int & int_ref;
11496 void foo(int_ref &); // valid ref-to-ref decl
11497 */
11501 }
11505 {
11509 /* We will already have complained. */
11511 else
11513 type);
11514 }
11515 else
11518 /* Process a list of type modifier keywords (such as
11519 const or volatile) that were given inside the `*' or `&'. */
11522 {
11523 type
11527 }
11529 /* Apply C++11 attributes to the pointer, and not to the
11530 type pointed to. This is unlike what is done for GNU
11531 attributes above. It is to comply with [dcl.ptr]/1:
11533 [the optional attribute-specifier-seq (7.6.1) appertains
11534 to the pointer and not to the object pointed to]. */
11547 }
11548 }
11550 /* A `constexpr' specifier used in an object declaration declares
11551 the object as `const'. */
11553 {
11554 /* DR1688 says that a `constexpr' specifier in combination with
11555 `volatile' is valid. */
11558 {
11561 }
11562 }
11568 {
11570 unqualified_id);
11572 }
11574 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
11575 qualified with a class-name, turn it into a METHOD_TYPE, unless
11576 we know that the function is static. We take advantage of this
11577 opportunity to do other processing that pertains to entities
11578 explicitly declared to be class members. Note that if DECLARATOR
11579 is non-NULL, we know it is a cdk_id declarator; otherwise, we
11580 would not have exited the loop above. */
11585 {
11591 {
11593 {
11597 }
11598 else
11602 }
11604 can skip the following checks. */
11607 qualifying type must certainly be complete. */
11608 funcdef_flag
11609 /* A friend declaration of "T::f" is OK, even if
11610 "T" is a template parameter. But, if this
11611 function is not a friend, the qualifying type
11612 must be a class. */
11614 /* For a declaration, the type need not be
11615 complete, if either it is dependent (since there
11616 is no meaningful definition of complete in that
11617 case) or the qualifying class is currently being
11618 defined. */
11621 /* Check that the qualifying type is complete. */
11625 {
11628 {
11636 }
11637 }
11639 {
11643 }
11644 }
11649 /* Now TYPE has the actual type. */
11652 {
11655 else
11657 }
11663 {
11664 /* [dcl.meaning]/1: The optional attribute-specifier-seq following
11665 a declarator-id appertains to the entity that is declared. */
11668 else
11669 /* We should have already diagnosed the issue (c++/78344). */
11671 }
11673 /* Handle parameter packs. */
11675 {
11677 /* Turn the type into a pack expansion.*/
11679 else
11681 }
11684 && !processing_template_decl
11686 {
11689 else
11692 }
11695 {
11696 /* [dcl.fct.spec] (C++11) The explicit specifier shall be used only
11697 in the declaration of a constructor or conversion function within
11698 a class definition. */
11705 else
11707 "only declarations of constructors and conversion operators "
11710 }
11713 {
11715 {
11718 }
11720 {
11723 }
11726 {
11729 }
11731 {
11734 }
11736 {
11739 }
11741 {
11745 }
11746 }
11748 /* If this is declaring a typedef name, return a TYPE_DECL. */
11750 {
11751 tree decl;
11753 /* This declaration:
11755 typedef void f(int) const;
11757 declares a function type which is not a member of any
11758 particular class, but which is cv-qualified; for
11759 example "f S::*" declares a pointer to a const-qualified
11760 member function of S. We record the cv-qualification in the
11761 function type. */
11763 {
11766 /* We have now dealt with these qualifiers. */
11769 }
11772 {
11775 }
11781 {
11784 }
11788 else
11792 {
11796 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
11798 /* The TYPE_DECL is "abstract" because there will be
11799 clones of this constructor/destructor, and there will
11800 be copies of this TYPE_DECL generated in those
11801 clones. The decloning optimization (for space) may
11802 revert this subsequently if it determines that
11803 the clones should share a common implementation. */
11805 }
11810 unqualified_id);
11812 /* If the user declares "typedef struct {...} foo" then the
11813 struct will have an anonymous name. Fill that name in now.
11814 Nothing can refer to it, so nothing needs know about the name
11815 change. */
11817 && unqualified_id
11835 /* Acknowledge that this was written:
11836 `using analias = atype;'. */
11840 }
11842 /* Detect the case of an array type of unspecified size
11843 which came, as such, direct from a typedef name.
11844 We must copy the type, so that the array's domain can be
11845 individually set by the object's initializer. */
11852 /* Detect where we're using a typedef of function type to declare a
11853 function. PARMS will not be set, so we must create it now. */
11856 {
11858 tree args;
11863 {
11869 }
11874 {
11875 /* The qualifiers on the function type become the qualifiers on
11876 the non-static member function. */
11880 }
11881 }
11883 /* If this is a type name (such as, in a cast or sizeof),
11884 compute the type and return it now. */
11887 {
11888 /* Note that here we don't care about type_quals. */
11890 /* Special case: "friend class foo" looks like a TYPENAME context. */
11892 {
11894 {
11897 }
11900 {
11901 /* Don't allow friend declaration without a class-key. */
11908 else
11911 type);
11912 }
11914 /* Only try to do this stuff if we didn't already give up. */
11916 {
11917 /* A friendly class? */
11921 else
11923 type);
11926 }
11927 }
11929 {
11936 /* Core issue #547: need to allow this in template type args.
11937 Allow it in general in C++11 for alias-declarations. */
11941 else
11943 }
11949 }
11953 && ! bitfield
11955 {
11958 }
11961 {
11962 /* Only functions may be declared using an operator-function-id. */
11964 {
11967 }
11972 type);
11973 }
11975 /* We don't check parameter types here because we can emit a better
11976 error message later. */
11978 {
11982 }
11984 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
11985 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
11988 {
11994 {
11997 else
12000 }
12002 /* A parameter declared as an array of T is really a pointer to T.
12003 One declared as a function is really a pointer to a function.
12004 One declared as a member is really a pointer to member. */
12007 {
12008 /* Transfer const-ness of array into that of type pointed to. */
12012 }
12015 }
12020 {
12026 }
12028 {
12032 {
12039 }
12041 {
12044 {
12050 else
12054 }
12056 /* The C99 flexible array extension. */
12059 {
12063 {
12066 }
12067 else
12068 {
12069 /* Array is a flexible member. */
12071 /* Do not warn on flexible array members in system
12076 else
12080 /* Flexible array member has a null domain. */
12082 }
12083 }
12086 {
12087 /* Happens when declaring arrays of sizes which
12088 are error_mark_node, for example. */
12090 }
12092 {
12093 /* Something like struct S { int N::j; }; */
12096 }
12099 {
12101 tree function_context;
12104 {
12105 /* This should never happen in pure C++ (the check
12106 could be an assert). It could happen in
12107 Objective-C++ if someone writes invalid code that
12108 uses a function declaration for an instance
12109 variable or property (instance variables and
12110 properties are parsed as FIELD_DECLs, but they are
12111 part of an Objective-C class, not a C++ class).
12112 That code is invalid and is caught by this
12113 check. */
12115 {
12117 unqualified_id);
12119 }
12121 /* ``A union may [ ... ] not [ have ] virtual functions.''
12122 ARM 9.5 */
12124 {
12126 unqualified_id);
12128 }
12133 {
12137 }
12138 }
12140 /* Check that the name used for a destructor makes sense. */
12142 {
12146 {
12151 }
12154 {
12158 }
12160 {
12163 }
12165 {
12168 }
12169 }
12171 {
12176 }
12179 {
12182 }
12184 {
12187 }
12190 {
12193 {
12199 }
12200 }
12202 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
12214 parms,
12215 unqualified_id,
12216 reqs,
12226 #if 0
12227 /* This clobbers the attrs stored in `decl' from `attrlist'. */
12228 /* The decl and setting of decl_attr is also turned off. */
12230 #endif
12232 /* [class.conv.ctor]
12234 A constructor declared without the function-specifier
12235 explicit that can be called with a single parameter
12236 specifies a conversion from the type of its first
12237 parameter to the type of its class. Such a constructor
12238 is called a converting constructor. */
12241 }
12246 {
12249 {
12251 {
12255 }
12256 else
12261 }
12262 }
12263 else
12264 {
12266 {
12270 }
12272 }
12275 {
12276 /* Friends are treated specially. */
12280 {
12282 {
12283 decl = check_explicit_specialization
12288 }
12292 funcdef_flag);
12294 }
12295 else
12297 }
12299 /* Structure field. It may not be a function, except for C++. */
12302 {
12304 {
12305 /* C++ allows static class members. All other work
12306 for this is done by grokfield. */
12314 unqualified_id);
12316 {
12320 }
12327 /* Even if there is an in-class initialization, DECL
12328 is considered undefined until an out-of-class
12329 definition is provided, unless this is an inline
12330 variable. */
12334 {
12340 }
12341 }
12342 else
12343 {
12346 unqualified_id);
12348 {
12350 unqualified_id);
12352 }
12357 {
12360 }
12363 {
12366 }
12369 {
12370 /* An attempt is being made to initialize a non-static
12371 member. This is new in C++11. */
12374 /* If this has been parsed with static storage class, but
12375 errors forced staticp to be cleared, ensure NSDMI is
12376 not present. */
12379 }
12380 }
12386 }
12387 }
12390 {
12391 tree original_name;
12399 else
12401 // FIXME:gcc_assert (original_name == dname);
12408 {
12411 name);
12412 else
12414 name);
12415 }
12419 /* Function declaration not at top level.
12420 Storage classes other than `extern' are not allowed
12421 and `extern' makes no difference. */
12426 {
12429 "%<static%> specifier invalid for function %qs "
12431 else
12433 "%<inline%> specifier invalid for function %qs "
12435 }
12438 {
12440 {
12443 }
12446 {
12451 }
12452 }
12454 /* Record whether the function is public. */
12464 publicp,
12467 sfk,
12468 funcdef_flag,
12477 {
12480 /* Don't allow a static member function in a class, and forbid
12481 declaring main to be static. */
12483 {
12487 }
12489 {
12490 /* 7.1.1: There can be no static function declarations within a
12491 block. */
12494 }
12497 {
12500 }
12501 }
12502 }
12503 else
12504 {
12505 /* It's a variable. */
12507 /* An uninitialized decl with `extern' is a reference. */
12509 declspecs,
12510 initialized,
12511 type_quals,
12512 inlinep,
12513 concept_p,
12514 template_count,
12524 {
12527 {
12532 }
12534 {
12537 }
12539 {
12541 "cannot explicitly declare member %q#D to have "
12544 }
12545 }
12547 {
12551 }
12556 {
12561 }
12562 }
12567 {
12571 }
12574 {
12576 {
12577 /* It's common practice (and completely valid) to have a const
12578 be initialized and declared extern. */
12581 }
12582 else
12583 {
12586 }
12587 }
12589 /* Record `register' declaration for warnings on &
12590 and in case doing stupid register allocation. */
12593 {
12595 /* Warn about register storage specifiers on PARM_DECLs. */
12597 {
12600 "ISO C++17 does not allow %<register%> storage "
12602 else
12605 }
12606 }
12612 /* Set constexpr flag on vars (functions got it in grokfndecl). */
12616 /* Record constancy and volatility on the DECL itself . There's
12617 no need to do this when processing a template; we'll do this
12618 for the instantiated declaration based on the type of DECL. */
12623 }
12624 }
12625 \f
12626 /* Subroutine of start_function. Ensure that each of the parameter
12627 types (as listed in PARMS) is complete, as is required for a
12628 function definition. */
12630 static void
12632 {
12634 {
12639 {
12645 }
12646 else
12647 /* grokparms or complete_type_or_else will have already issued
12648 an error. */
12650 }
12651 }
12653 /* Returns nonzero if T is a local variable. */
12655 int
12657 {
12659 /* A VAR_DECL with a context that is a _TYPE is a static data
12660 member. */
12662 /* Any other non-local variable must be at namespace scope. */
12668 }
12670 /* Like local_variable_p, but suitable for use as a tree-walking
12671 function. */
12673 static tree
12676 {
12684 }
12686 /* Check that ARG, which is a default-argument expression for a
12687 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
12688 something goes wrong. DECL may also be a _TYPE node, rather than a
12689 DECL, if there is no DECL available. */
12691 tree
12693 {
12694 tree var;
12695 tree decl_type;
12698 /* We get a DEFAULT_ARG when looking at an in-class declaration
12699 with a default argument. Ignore the argument for now; we'll
12700 deal with it after the class is complete. */
12704 {
12707 }
12708 else
12715 /* Something already went wrong. There's no need to check
12716 further. */
12719 /* [dcl.fct.default]
12721 A default argument expression is implicitly converted to the
12722 parameter type. */
12724 /* Avoid digest_init clobbering the initializer. */
12727 LOOKUP_IMPLICIT);
12730 /* Avoid redundant -Wzero-as-null-pointer-constant warnings at
12731 the call sites. */
12736 /* [dcl.fct.default]
12738 Local variables shall not be used in default argument
12739 expressions.
12741 The keyword `this' shall not be used in a default argument of a
12742 member function. */
12745 {
12747 {
12751 else
12753 }
12755 }
12757 /* All is well. */
12759 }
12761 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
12763 static tree
12765 {
12770 {
12773 else
12775 }
12777 /* Do warn about using typedefs to a deprecated class. */
12789 return type_is_deprecated
12793 }
12795 /* Decode the list of parameter types for a function type.
12796 Given the list of things declared inside the parens,
12797 return a list of types.
12799 If this parameter does not end with an ellipsis, we append
12800 void_list_node.
12802 *PARMS is set to the chain of PARM_DECLs created. */
12804 tree
12806 {
12809 tree parm;
12813 {
12826 {
12828 && !init
12831 /* DR 577: A parameter list consisting of a single
12832 unnamed parameter of non-dependent type 'void'. */
12836 "invalid use of cv-qualified type %qT in "
12838 else
12840 "invalid use of type %<void%> in parameter "
12842 /* It's not a good idea to actually create parameters of
12843 type `void'; other parts of the compiler assume that a
12844 void type terminates the parameter list. */
12847 }
12850 {
12852 {
12856 }
12858 /* Top-level qualifiers on the parameters are
12859 ignored for function types. */
12862 {
12866 }
12870 {
12871 /* Before C++17 DR 393:
12872 [dcl.fct]/6, parameter types cannot contain pointers
12873 (references) to arrays of unknown bound. */
12878 {
12886 }
12889 ptr
12895 }
12901 }
12906 }
12914 }
12916 \f
12917 /* D is a constructor or overloaded `operator='.
12919 Let T be the class in which D is declared. Then, this function
12920 returns:
12922 -1 if D's is an ill-formed constructor or copy assignment operator
12923 whose first parameter is of type `T'.
12924 0 if D is not a copy constructor or copy assignment
12925 operator.
12926 1 if D is a copy constructor or copy assignment operator whose
12927 first parameter is a reference to non-const qualified T.
12928 2 if D is a copy constructor or copy assignment operator whose
12929 first parameter is a reference to const qualified T.
12931 This function can be used as a predicate. Positive values indicate
12932 a copy constructor and nonzero values indicate a copy assignment
12933 operator. */
12935 int
12937 {
12938 tree args;
12939 tree arg_type;
12947 /* Instantiations of template member functions are never copy
12948 functions. Note that member functions of templated classes are
12949 represented as template functions internally, and we must
12950 accept those as copy functions. */
12962 {
12963 /* Pass by value copy assignment operator. */
12965 }
12969 {
12972 }
12973 else
12979 /* There are more non-optional args. */
12983 }
12985 /* D is a constructor or overloaded `operator='.
12987 Let T be the class in which D is declared. Then, this function
12988 returns true when D is a move constructor or move assignment
12989 operator, false otherwise. */
12991 bool
12993 {
12997 /* There are no move constructors if we are in C++98 mode. */
13003 /* Instantiations of template member functions are never move
13004 functions. Note that member functions of templated classes are
13005 represented as template functions internally, and we must
13006 accept those as move functions. */
13010 }
13012 /* D is a constructor or overloaded `operator='.
13014 Then, this function returns true when D has the same signature as a move
13015 constructor or move assignment operator (because either it is such a
13016 ctor/op= or it is a template specialization with the same signature),
13017 false otherwise. */
13019 bool
13021 {
13022 tree args;
13023 tree arg_type;
13043 /* There are more non-optional args. */
13047 }
13049 /* Remember any special properties of member function DECL. */
13051 void
13053 {
13054 tree class_type;
13061 {
13068 {
13069 /* [class.copy]
13071 A non-template constructor for class X is a copy
13072 constructor if its first parameter is of type X&, const
13073 X&, volatile X& or const volatile X&, and either there
13074 are no other parameters or else all other parameters have
13075 default arguments. */
13081 }
13092 }
13094 {
13095 /* [class.copy]
13097 A non-template assignment operator for class X is a copy
13098 assignment operator if its parameter is of type X, X&, const
13099 X&, volatile X& or const volatile X&. */
13104 {
13110 }
13113 }
13117 /* Destructors are handled in check_methods. */
13118 }
13120 /* Check a constructor DECL has the correct form. Complains
13121 if the class has a constructor of the form X(X). */
13123 bool
13125 {
13129 {
13130 /* [class.copy]
13132 A declaration of a constructor for a class X is ill-formed if
13133 its first parameter is of type (optionally cv-qualified) X
13134 and either there are no other parameters or else all other
13135 parameters have default arguments.
13137 We *don't* complain about member template instantiations that
13138 have this form, though; they can occur as we try to decide
13139 what constructor to use during overload resolution. Since
13140 overload resolution will never prefer such a constructor to
13141 the non-template copy constructor (which is either explicitly
13142 or implicitly defined), there's no need to worry about their
13143 existence. Theoretically, they should never even be
13144 instantiated, but that's hard to forestall. */
13148 }
13151 }
13153 /* DECL is a declaration for an overloaded or conversion operator. If
13154 COMPLAIN is true, errors are issued for invalid declarations. */
13156 bool
13158 {
13167 tree_code operator_code;
13170 {
13171 /* Conversion operators are TYPE_EXPR for the purposes of this
13172 function. */
13175 }
13176 else
13177 {
13184 }
13187 {
13188 /* operator new and operator delete are quite special. */
13191 {
13210 }
13212 /* [basic.std.dynamic.allocation]/1:
13214 A program is ill-formed if an allocation function is declared
13215 in a namespace scope other than global scope or declared
13216 static in global scope.
13218 The same also holds true for deallocation functions. */
13220 {
13222 {
13225 }
13228 {
13231 }
13232 }
13236 else
13237 {
13240 }
13243 }
13245 /* An operator function must either be a non-static member function
13246 or have at least one parameter of a class, a reference to a class,
13247 an enumeration, or a reference to an enumeration. 13.4.0.6 */
13249 {
13255 {
13258 }
13261 {
13265 }
13268 {
13270 {
13275 }
13281 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
13282 because these checks are performed even on template
13283 functions. */
13287 }
13288 }
13291 /* There are no further restrictions on the arguments to an overloaded
13292 "operator ()". */
13296 {
13297 /* 13.4.0.3 */
13300 }
13302 /* Count the number of arguments and check for ellipsis. */
13305 {
13307 {
13308 /* Variadic. */
13311 }
13313 }
13315 /* Verify correct number of arguments. */
13317 {
13320 {
13321 /* We have a unary instance of an ambi-ary op. Remap to the
13322 unary one. */
13328 }
13330 {
13331 /* This was an ambiguous operator but is invalid. */
13336 }
13339 && ! processing_template_decl
13340 /* x++ and x--'s second argument must be an int. */
13342 integer_type_node))
13343 {
13347 decl);
13349 }
13354 {
13359 }
13364 {
13369 }
13374 }
13376 /* There can be no default arguments. */
13379 {
13385 else
13386 {
13389 }
13390 }
13392 /* At this point the declaration is well-formed. It may not be
13393 sensible though. */
13395 /* Check member function warnings only on the in-class declaration.
13396 There's no point warning on an out-of-class definition. */
13400 /* Warn about conversion operators that will never be used. */
13404 {
13413 ref
13419 {
13422 ref
13427 /* Don't force t to be complete here. */
13432 ref
13437 }
13438 }
13443 /* Effective C++ rules below. */
13445 /* More Effective C++ rule 7. */
13452 /* More Effective C++ rule 6. */
13457 {
13466 {
13471 }
13472 else
13473 {
13476 }
13477 }
13479 /* Effective C++ rule 23. */
13490 }
13491 \f
13492 /* Return a string giving the keyword associate with CODE. */
13496 {
13498 {
13511 }
13512 }
13514 /* Name lookup in an elaborated-type-specifier (after the keyword
13515 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
13516 elaborated-type-specifier is invalid, issue a diagnostic and return
13517 error_mark_node; otherwise, return the *_TYPE to which it referred.
13518 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
13520 tree
13522 tree decl,
13524 {
13525 tree type;
13527 /* In the case of:
13529 struct S { struct S *p; };
13531 name lookup will find the TYPE_DECL for the implicit "S::S"
13532 typedef. Adjust for that here. */
13538 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
13539 is false for this case as well. */
13541 {
13545 }
13546 /* Accept template template parameters. */
13550 ;
13551 /* [dcl.type.elab]
13553 If the identifier resolves to a typedef-name or the
13554 simple-template-id resolves to an alias template
13555 specialization, the elaborated-type-specifier is ill-formed.
13557 In other words, the only legitimate declaration to use in the
13558 elaborated type specifier is the implicit typedef created when
13559 the type is declared. */
13563 {
13567 else
13572 }
13577 {
13581 }
13584 {
13588 }
13592 {
13593 /* If a class template appears as elaborated type specifier
13594 without a template header such as:
13596 template <class T> class C {};
13597 void f(class C); // No template header here
13599 then the required template argument is missing. */
13604 }
13607 }
13609 /* Lookup NAME in elaborate type specifier in scope according to
13610 SCOPE and issue diagnostics if necessary.
13611 Return *_TYPE node upon success, NULL_TREE when the NAME is not
13612 found, and ERROR_MARK_NODE for type error. */
13614 static tree
13617 {
13618 tree t;
13619 tree decl;
13621 {
13622 /* First try ordinary name lookup, ignoring hidden class name
13623 injected via friend declaration. */
13626 /* If that fails, the name will be placed in the smallest
13627 non-class, non-function-prototype scope according to 3.3.1/5.
13628 We may already have a hidden name declared as friend in this
13629 scope. So lookup again but not ignoring hidden names.
13630 If we find one, that name will be made visible rather than
13631 creating a new tag. */
13634 }
13635 else
13640 /* If scope is ts_current we're defining a class, so ignore a
13641 template template parameter. */
13647 {
13648 /* Look for invalid nested type:
13649 class C {
13650 class C {};
13651 }; */
13653 {
13656 decl);
13658 }
13660 /* Two cases we need to consider when deciding if a class
13661 template is allowed as an elaborated type specifier:
13662 1. It is a self reference to its own class.
13663 2. It comes with a template header.
13665 For example:
13667 template <class T> class C {
13668 class C *c1; // DECL_SELF_REFERENCE_P is true
13669 class D;
13670 };
13671 template <class U> class C; // template_header_p is true
13672 template <class T> class C<T>::D {
13673 class C *c2; // DECL_SELF_REFERENCE_P is true
13674 }; */
13677 decl,
13678 template_header_p
13683 {
13692 }
13695 }
13697 {
13701 }
13702 else
13704 }
13706 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
13707 Define the tag as a forward-reference if it is not defined.
13709 If a declaration is given, process it here, and report an error if
13710 multiple declarations are not identical.
13712 SCOPE is TS_CURRENT when this is also a definition. Only look in
13713 the current frame for the name (since C++ allows new names in any
13714 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
13715 declaration. Only look beginning from the current scope outward up
13716 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
13718 TEMPLATE_HEADER_P is true when this declaration is preceded by
13719 a set of template parameters. */
13721 static tree
13724 {
13731 {
13744 }
13746 /* In case of anonymous name, xref_tag is only called to
13747 make type node and push name. Name lookup is not required. */
13758 {
13762 /* Since SCOPE is not TS_CURRENT, we are not looking at a
13763 definition of this tag. Since, in addition, we are currently
13764 processing a (member) template declaration of a template
13765 class, we must be very careful; consider:
13767 template <class X> struct S1
13769 template <class U> struct S2
13770 {
13771 template <class V> friend struct S1;
13772 };
13774 Here, the S2::S1 declaration should not be confused with the
13775 outer declaration. In particular, the inner version should
13776 have a template parameter of level 2, not level 1.
13778 On the other hand, when presented with:
13780 template <class T> struct S1
13781 {
13782 template <class U> struct S2 {};
13783 template <class U> friend struct S2;
13784 };
13786 the friend must find S1::S2 eventually. We accomplish this
13787 by making sure that the new type we create to represent this
13788 declaration has the right TYPE_CONTEXT. */
13791 }
13794 {
13795 /* If no such tag is yet defined, create a forward-reference node
13796 and record it as the "definition".
13797 When a real declaration of this type is found,
13798 the forward-reference will be altered into a real type. */
13800 {
13803 }
13804 else
13805 {
13809 {
13810 /* Mark it as a lambda type. */
13812 /* And push it into current scope. */
13814 }
13816 }
13817 }
13818 else
13819 {
13821 {
13822 /* Check that we aren't trying to overload a class with different
13823 constraints. */
13826 {
13829 }
13832 }
13836 {
13840 }
13843 {
13844 /* This is no longer an invisible friend. Make it
13845 visible. */
13852 {
13856 }
13857 }
13858 }
13861 }
13863 /* Wrapper for xref_tag_1. */
13865 tree
13868 {
13869 tree ret;
13875 }
13878 tree
13880 {
13885 else
13892 }
13894 /* Create the binfo hierarchy for REF with (possibly NULL) base list
13895 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
13896 access_* node, and the TREE_VALUE is the type of the base-class.
13897 Non-NULL TREE_TYPE indicates virtual inheritance. */
13899 void
13901 {
13908 tree default_access;
13914 /* The base of a derived class is private by default, all others are
13915 public. */
13920 /* First, make sure that any templates in base-classes are
13921 instantiated. This ensures that if we call ourselves recursively
13922 we do not get confused about which classes are marked and which
13923 are not. */
13926 {
13929 /* The dependent_type_p call below should really be dependent_scope_p
13930 so that we give a hard error about using an incomplete type as a
13931 base, but we allow it with a pedwarn for backward
13932 compatibility. */
13938 /* An incomplete type. Remove it from the list. */
13940 else
13941 {
13942 max_bases++;
13944 max_dvbases++;
13948 }
13949 }
13954 /* The binfo slot should be empty, unless this is an (ill-formed)
13955 redefinition. */
13966 /* Apply base-class info set up to the variants of this type. */
13970 {
13972 /* A C++98 POD cannot have base classes. */
13976 {
13979 }
13980 }
13987 {
13988 /* An aggregate can't have virtual base classes. */
13996 }
13999 {
14007 /* Before C++17, an aggregate cannot have base classes. In C++17, an
14008 aggregate can't have virtual, private, or protected base classes. */
14019 {
14021 basetype);
14023 }
14027 {
14029 /* The original basetype could have been a typedef'd type. */
14032 /* Inherit flags from the base. */
14043 }
14045 /* We must do this test after we've seen through a typedef
14046 type. */
14048 {
14051 else
14054 }
14057 /* Regenerate the pack expansion for the bases. */
14071 dropped_base:
14072 /* Update max_vbases to reflect the reality that we are dropping
14073 this base: if it reaches zero we want to undo the vec_alloc
14074 above to avoid inconsistencies during error-recovery: eg, in
14075 build_special_member_call, CLASSTYPE_VBASECLASSES non null
14076 and vtt null (c++/27952). */
14078 max_vbases--;
14080 max_vbases
14082 }
14089 /* If we didn't get max_vbases vbases, we must have shared at
14090 least one of them, and are therefore diamond shaped. */
14093 /* Unmark all the types. */
14098 /* Now see if we have a repeated base type. */
14100 {
14103 {
14105 {
14108 }
14110 }
14115 else
14117 }
14118 }
14120 \f
14121 /* Copies the enum-related properties from type SRC to type DST.
14122 Used with the underlying type of an enum and the enum itself. */
14123 static void
14125 {
14126 tree t;
14128 {
14138 else
14142 }
14143 }
14145 /* Begin compiling the definition of an enumeration type.
14146 NAME is its name,
14148 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
14150 UNDERLYING_TYPE is the type that will be used as the storage for
14151 the enumeration type. This should be NULL_TREE if no storage type
14152 was specified.
14154 ATTRIBUTES are any attributes specified after the enum-key.
14156 SCOPED_ENUM_P is true if this is a scoped enumeration type.
14158 if IS_NEW is not NULL, gets TRUE iff a new type is created.
14160 Returns the type object, as yet incomplete.
14161 Also records info about it so that build_enumerator
14162 may be used to declare the individual values as they are read. */
14164 tree
14167 {
14173 /* [C++0x dcl.enum]p5:
14175 If not explicitly specified, the underlying type of a scoped
14176 enumeration type is int. */
14183 /* If this is the real definition for a previous forward reference,
14184 fill in the contents in the same object that used to be the
14185 forward reference. */
14191 /* In case of a template_decl, the only check that should be deferred
14192 to instantiation time is the comparison of underlying types. */
14194 {
14196 {
14202 }
14204 {
14210 }
14216 {
14222 }
14223 }
14227 {
14228 /* In case of error, make a dummy enum to allow parsing to
14229 continue. */
14231 {
14234 }
14236 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
14237 of an opaque enum, or an opaque enum of an already defined
14238 enumeration (C++0x only).
14239 In any other case, it'll be NULL_TREE. */
14241 {
14244 }
14247 /* Do not push the decl more than once, unless we need to
14248 compare underlying types at instantiation time */
14251 || (underlying_type
14255 {
14259 /* std::byte aliases anything. */
14264 }
14265 else
14272 /* The enum is considered opaque until the opening '{' of the
14273 enumerator list. */
14276 }
14283 {
14285 /* We already checked that it matches, don't change it to a different
14288 {
14291 }
14294 else
14297 }
14299 /* If into a template class, the returned enum is always the first
14300 declaration (opaque or not) seen. This way all the references to
14301 this type will be to the same declaration. The following ones are used
14302 only to check for definition errors. */
14305 else
14307 }
14309 /* After processing and defining all the values of an enumeration type,
14310 install their decls in the enumeration type.
14311 ENUMTYPE is the type object. */
14313 void
14315 {
14316 tree values;
14317 tree underlying_type;
14318 tree decl;
14319 tree value;
14321 tree t;
14323 bool fixed_underlying_type_p
14326 /* We built up the VALUES in reverse order. */
14329 /* For an enum defined in a template, just set the type of the values;
14330 all further processing is postponed until the template is
14331 instantiated. We need to set the type so that tsubst of a CONST_DECL
14332 works. */
14334 {
14336 values;
14340 }
14342 /* Determine the minimum and maximum values of the enumerators. */
14344 {
14348 values;
14350 {
14353 /* [dcl.enum]: Following the closing brace of an enum-specifier,
14354 each enumerator has the type of its enumeration. Prior to the
14355 closing brace, the type of each enumerator is the type of its
14356 initializing value. */
14359 /* Update the minimum and maximum values, if appropriate. */
14363 /* Figure out what the minimum and maximum values of the
14364 enumerators are. */
14371 }
14372 }
14373 else
14374 /* [dcl.enum]
14376 If the enumerator-list is empty, the underlying type is as if
14377 the enumeration had a single enumerator with value 0. */
14381 {
14382 /* Compute the number of bits require to represent all values of the
14383 enumeration. We must do this before the type of MINNODE and
14384 MAXNODE are transformed, since tree_int_cst_min_precision relies
14385 on the TREE_TYPE of the value it is passed. */
14393 /* Determine the underlying type of the enumeration.
14395 [dcl.enum]
14397 The underlying type of an enumeration is an integral type that
14398 can represent all the enumerator values defined in the
14399 enumeration. It is implementation-defined which integral type is
14400 used as the underlying type for an enumeration except that the
14401 underlying type shall not be larger than int unless the value of
14402 an enumerator cannot fit in an int or unsigned int.
14404 We use "int" or an "unsigned int" as the underlying type, even if
14405 a smaller integral type would work, unless the user has
14406 explicitly requested that we use the smallest possible type. The
14407 user can request that for all enumerations with a command line
14408 flag, or for just one enumeration with an attribute. */
14410 use_short_enum = flag_short_enums
14413 /* If the precision of the type was specified with an attribute and it
14414 was too small, give an error. Otherwise, use it. */
14416 {
14419 else
14420 {
14423 }
14424 }
14428 itk++)
14429 {
14435 }
14437 {
14438 /* DR 377
14440 IF no integral type can represent all the enumerator values, the
14441 enumeration is ill-formed. */
14446 }
14448 /* [dcl.enum]
14450 The value of sizeof() applied to an enumeration type, an object
14451 of an enumeration type, or an enumerator, is the value of sizeof()
14452 applied to the underlying type. */
14455 /* Compute the minimum and maximum values for the type.
14457 [dcl.enum]
14459 For an enumeration where emin is the smallest enumerator and emax
14460 is the largest, the values of the enumeration are the values of the
14461 underlying type in the range bmin to bmax, where bmin and bmax are,
14462 respectively, the smallest and largest values of the smallest bit-
14463 field that can store emin and emax. */
14465 /* The middle-end currently assumes that types with TYPE_PRECISION
14466 narrower than their underlying type are suitably zero or sign
14467 extended to fill their mode. Similarly, it assumes that the front
14468 end assures that a value of a particular type must be within
14469 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
14471 We used to set these fields based on bmin and bmax, but that led
14472 to invalid assumptions like optimizing away bounds checking. So
14473 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
14474 TYPE_MAX_VALUE to the values for the mode above and only restrict
14475 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
14479 set_min_and_max_values_for_integral_type
14482 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
14485 }
14486 else
14489 /* Convert each of the enumerators to the type of the underlying
14490 type of the enumeration. */
14492 {
14493 location_t saved_location;
14499 /* If the enumeration type has a fixed underlying type, we
14500 already checked all of the enumerator values. */
14502 else
14505 tf_warning_or_error);
14508 /* Do not clobber shared ints. */
14510 {
14514 }
14516 }
14518 /* Fix up all variant types of this enum type. */
14525 {
14527 /* TYPE_FIELDS needs fixup. */
14529 }
14531 /* Finish debugging output for this type. */
14534 /* Each enumerator now has the type of its enumeration. Clear the cache
14535 so that this change in types doesn't confuse us later on. */
14537 }
14539 /* Finishes the enum type. This is called only the first time an
14540 enumeration is seen, be it opaque or odinary.
14541 ENUMTYPE is the type object. */
14543 void
14545 {
14547 {
14551 }
14553 /* If this is a forward declaration, there should not be any variants,
14554 though we can get a variant in the middle of an enum-specifier with
14555 wacky code like 'enum E { e = sizeof(const E*) };' */
14559 }
14561 /* Build and install a CONST_DECL for an enumeration constant of the
14562 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
14563 Apply ATTRIBUTES if available. LOC is the location of NAME.
14564 Assignment of sequential values by default is handled here. */
14566 void
14568 location_t loc)
14569 {
14570 tree decl;
14571 tree context;
14572 tree type;
14574 /* scalar_constant_value will pull out this expression, so make sure
14575 it's folded as appropriate. */
14579 /* If the VALUE was erroneous, pretend it wasn't there; that will
14580 result in the enum being assigned the next value in sequence. */
14584 /* Remove no-op casts from the value. */
14589 {
14590 /* Validate and default VALUE. */
14592 {
14594 {
14599 }
14602 value = perform_implicit_conversion_flags
14610 {
14613 {
14617 }
14618 else
14619 {
14623 {
14627 }
14628 }
14629 }
14630 }
14632 /* Default based on previous value. */
14634 {
14636 {
14637 tree prev_value;
14640 /* C++03 7.2/4: If no initializer is specified for the first
14641 enumerator, the type is an unspecified integral
14642 type. Otherwise the type is the same as the type of the
14643 initializing value of the preceding enumerator unless the
14644 incremented value is not representable in that type, in
14645 which case the type is an unspecified integral type
14646 sufficient to contain the incremented value. */
14650 else
14651 {
14657 {
14660 {
14663 {
14669 }
14676 }
14679 else
14681 }
14684 {
14687 }
14688 }
14689 }
14690 else
14692 }
14694 /* Remove no-op casts from the value. */
14697 /* If the underlying type of the enum is fixed, check whether
14698 the enumerator values fits in the underlying type. If it
14699 does not fit, the program is ill-formed [C++0x dcl.enum]. */
14701 && value
14703 {
14708 /* Convert the value to the appropriate type. */
14710 }
14711 }
14713 /* C++ associates enums with global, function, or class declarations. */
14716 /* Build the actual enumeration constant. Note that the enumeration
14717 constants have the underlying type of the enum (if it is fixed)
14718 or the type of their initializer (if the underlying type of the
14719 enum is not fixed):
14721 [ C++0x dcl.enum ]
14723 If the underlying type is fixed, the type of each enumerator
14724 prior to the closing brace is the underlying type; if the
14725 initializing value of an enumerator cannot be represented by
14726 the underlying type, the program is ill-formed. If the
14727 underlying type is not fixed, the type of each enumerator is
14728 the type of its initializing value.
14730 If the underlying type is not fixed, it will be computed by
14731 finish_enum and we will reset the type of this enumerator. Of
14732 course, if we're processing a template, there may be no value. */
14746 {
14747 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
14748 on the TYPE_FIELDS list for `S'. (That's so that you can say
14749 things like `S::i' later.) */
14751 /* The enumerator may be getting declared outside of its enclosing
14752 class, like so:
14754 class S { public: enum E : int; }; enum S::E : int { i = 7; };
14756 For which case we need to make sure that the access of `S::i'
14757 matches the access of `S::E'. */
14763 else
14769 }
14770 else
14773 /* Add this enumeration constant to the list for this type. */
14775 }
14777 /* Look for an enumerator with the given NAME within the enumeration
14778 type ENUMTYPE. This routine is used primarily for qualified name
14779 lookup into an enumerator in C++0x, e.g.,
14781 enum class Color { Red, Green, Blue };
14783 Color color = Color::Red;
14785 Returns the value corresponding to the enumerator, or
14786 NULL_TREE if no such enumerator was found. */
14787 tree
14789 {
14790 tree e;
14795 }
14797 \f
14798 /* We're defining DECL. Make sure that its type is OK. */
14800 static void
14802 {
14806 /* In a function definition, arg types must be complete. */
14813 {
14818 /* Make it return void instead. */
14821 void_type_node,
14823 else
14825 fntype
14828 fntype = (cp_build_type_attribute_variant
14831 }
14832 else
14833 {
14837 }
14838 }
14840 /* True iff FN is an implicitly-defined default constructor. */
14842 static bool
14844 {
14848 }
14850 /* Clobber the contents of *this to let the back end know that the object
14851 storage is dead when we enter the constructor or leave the destructor. */
14853 static tree
14855 {
14856 /* Clobbering an empty base is pointless, and harmful if its one byte
14857 TYPE_SIZE overlays real data. */
14861 /* If we have virtual bases, clobber the whole object, but only if we're in
14862 charge. If we don't have virtual bases, clobber the as-base type so we
14863 don't mess with tail padding. */
14875 {
14878 }
14885 }
14887 /* Create the FUNCTION_DECL for a function definition.
14888 DECLSPECS and DECLARATOR are the parts of the declaration;
14889 they describe the function's name and the type it returns,
14890 but twisted together in a fashion that parallels the syntax of C.
14892 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
14893 DECLARATOR is really the DECL for the function we are about to
14894 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
14895 indicating that the function is an inline defined in-class.
14897 This function creates a binding context for the function body
14898 as well as setting up the FUNCTION_DECL in current_function_decl.
14900 For C++, we must first check whether that datum makes any sense.
14901 For example, "class A local_a(1,2);" means that variable local_a
14902 is an aggregate of type A, which should have a constructor
14903 applied to it with the argument list [1, 2].
14905 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
14906 or may be a BLOCK if the function has been defined previously
14907 in this translation unit. On exit, DECL_INITIAL (decl1) will be
14908 error_mark_node if the function has never been defined, or
14909 a BLOCK if the function has been defined somewhere. */
14911 bool
14913 {
14915 tree fntype;
14916 tree restype;
14919 tree current_function_parms;
14924 /* Sanity check. */
14932 /* ISO C++ 11.4/5. A friend function defined in a class is in
14933 the (lexical) scope of the class in which it is defined. */
14935 {
14938 /* CTYPE could be null here if we're dealing with a template;
14939 for example, `inline friend float foo()' inside a template
14940 will have no CTYPE set. */
14943 else
14945 }
14952 /* Handle gnu_inline attribute. */
14954 {
14959 }
14962 /* This is a constructor, we must ensure that any default args
14963 introduced by this definition are propagated to the clones
14964 now. The clones are used directly in overload resolution. */
14967 /* Sometimes we don't notice that a function is a static member, and
14968 build a METHOD_TYPE for it. Fix that up now. */
14972 /* Set up current_class_type, and enter the scope of the class, if
14973 appropriate. */
14979 /* Now that we have entered the scope of the class, we must restore
14980 the bindings for any template parameters surrounding DECL1, if it
14981 is an inline member template. (Order is important; consider the
14982 case where a template parameter has the same name as a field of
14983 the class.) It is not until after this point that
14984 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
14988 /* Effective C++ rule 15. */
14996 /* Make the init_value nonzero so pushdecl knows this is not tentative.
14997 error_mark_node is replaced below (in poplevel) with the BLOCK. */
15001 /* This function exists in static storage.
15002 (This does not mean `static' in the C sense!) */
15005 /* We must call push_template_decl after current_class_type is set
15006 up. (If we are processing inline definitions after exiting a
15007 class scope, current_class_type will be NULL_TREE until set above
15008 by push_nested_class.) */
15010 {
15013 {
15017 }
15019 }
15021 /* Make sure the parameter and return types are reasonable. When
15022 you declare a function, these types can be incomplete, but they
15023 must be complete when you define the function. */
15026 /* Build the return declaration for the function. */
15030 {
15031 tree resdecl;
15039 }
15041 /* Record the decl so that the function name is defined.
15042 If we already have a decl for this name, and it is a FUNCTION_DECL,
15043 use the old decl. */
15045 {
15046 /* A specialization is not used to guide overload resolution. */
15050 {
15054 /* If something went wrong when registering the declaration,
15055 use DECL1; we have to have a FUNCTION_DECL to use when
15056 parsing the body of the function. */
15057 ;
15058 else
15059 {
15060 /* Otherwise, OLDDECL is either a previous declaration
15061 of the same function or DECL1 itself. */
15068 {
15069 tree context;
15071 /* Check whether DECL1 is in an anonymous
15072 namespace. */
15074 context;
15076 {
15080 }
15084 OPT_Wmissing_declarations,
15086 }
15089 }
15090 }
15091 else
15092 {
15093 /* We need to set the DECL_CONTEXT. */
15096 }
15100 /* If #pragma weak applies, mark the decl appropriately now.
15101 The pragma only applies to global functions. Because
15102 determining whether or not the #pragma applies involves
15103 computing the mangled name for the declaration, we cannot
15104 apply the pragma until after we have merged this declaration
15105 with any previous declarations; if the original declaration
15106 has a linkage specification, that specification applies to
15107 the definition as well, and may affect the mangled name. */
15110 }
15112 /* We are now in the scope of the function being defined. */
15115 /* Save the parm names or decls from this function's declarator
15116 where store_parm_decls will find them. */
15119 /* Let the user know we're compiling this function. */
15124 /* This function may already have been parsed, in which case just
15125 return; our caller will skip over the body without parsing. */
15129 /* Initialize RTL machinery. We cannot do this until
15130 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
15131 even when processing a template; this is how we get
15132 CFUN set up, and our per-function variables initialized.
15133 FIXME factor out the non-RTL stuff. */
15137 /* Initialize the language data structures. Whenever we start
15138 a new function, we destroy temporaries in the usual way. */
15144 {
15147 }
15149 /* Start the statement-tree, start the tree now. */
15152 /* If we are (erroneously) defining a function that we have already
15153 defined before, wipe out what we knew before. */
15158 {
15159 /* We know that this was set up by `grokclassfn'. We do not
15160 wait until `store_parm_decls', since evil parse errors may
15161 never get us to that point. Here we keep the consistency
15162 between `current_class_type' and `current_class_ptr'. */
15168 cp_function_chain->x_current_class_ref
15170 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
15173 /* Constructors and destructors need to know whether they're "in
15174 charge" of initializing virtual base classes. */
15177 {
15180 }
15182 {
15185 }
15186 }
15189 /* Implicitly-defined methods (like the
15190 destructor for a class in which no destructor
15191 is explicitly declared) must not be defined
15192 until their definition is needed. So, we
15193 ignore interface specifications for
15194 compiler-generated functions. */
15200 {
15207 /* This is a function in a local class in an extern inline
15208 or template function. */
15210 }
15211 /* If this function belongs to an interface, it is public.
15212 If it belongs to someone else's interface, it is also external.
15213 This only affects inlines and template instantiations. */
15215 {
15218 {
15222 && ! flag_implement_inlines
15225 /* For WIN32 we also want to put these in linkonce sections. */
15227 }
15228 else
15231 /* If this function is in an interface implemented in this file,
15232 make sure that the back end knows to emit this function
15233 here. */
15236 }
15239 {
15240 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
15241 interface, we will have both finfo->interface_unknown and
15242 finfo->interface_only set. In that case, we don't want to
15243 use the normal heuristics because someone will supply a
15244 #pragma implementation elsewhere, and deducing it here would
15245 produce a conflict. */
15250 }
15251 else
15252 {
15253 /* This is a definition, not a reference.
15254 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
15262 else
15264 }
15266 /* Determine the ELF visibility attribute for the function. We must not
15267 do this before calling "pushdecl", as we must allow "duplicate_decls"
15268 to merge any attributes appropriately. We also need to wait until
15269 linkage is set. */
15283 {
15286 }
15296 /* Clobbering an empty base is harmful if it overlays real data. */
15298 /* We can't clobber safely for an implicitly-defined default constructor
15299 because part of the initialization might happen before we enter the
15300 constructor, via AGGR_INIT_ZERO_FIRST (c++/68006). */
15314 }
15317 /* Like start_preparsed_function, except that instead of a
15318 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
15320 Returns true on success. If the DECLARATOR is not suitable
15321 for a function, we return false, which tells the parser to
15322 skip the entire function. */
15324 bool
15327 tree attrs)
15328 {
15329 tree decl1;
15335 /* If the declarator is not suitable for a function definition,
15336 cause a syntax error. */
15338 {
15341 }
15344 /* main must return int. grokfndecl should have corrected it
15345 (and issued a diagnostic) if the user got it wrong. */
15347 integer_type_node));
15350 }
15351 \f
15352 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
15353 FN. */
15355 static bool
15357 {
15359 && !processing_template_decl
15361 /* We insert the EH_SPEC_BLOCK only in the original
15362 function; then, it is copied automatically to the
15363 clones. */
15365 /* Implicitly-generated constructors and destructors have
15366 exception specifications. However, those specifications
15367 are the union of the possible exceptions specified by the
15368 constructors/destructors for bases and members, so no
15369 unallowed exception will ever reach this function. By
15370 not creating the EH_SPEC_BLOCK we save a little memory,
15371 and we avoid spurious warnings about unreachable
15372 code. */
15374 }
15376 /* Store the parameter declarations into the current function declaration.
15377 This is called after parsing the parameter declarations, before
15378 digesting the body of the function.
15380 Also install to binding contour return value identifier, if any. */
15382 static void
15384 {
15386 tree parm;
15388 /* This is a chain of any other decls that came in among the parm
15389 declarations. If a parm is declared with enum {foo, bar} x;
15390 then CONST_DECLs for foo and bar are put here. */
15394 {
15395 /* This case is when the function was defined with an ANSI prototype.
15396 The parms already have decls, so we need not do anything here
15397 except record them as in effect
15398 and complain if any redundant old-style parm decls were written. */
15401 tree next;
15403 /* Must clear this because it might contain TYPE_DECLs declared
15404 at class level. */
15407 /* If we're doing semantic analysis, then we'll call pushdecl
15408 for each of these. We must do them in reverse order so that
15409 they end in the correct forward order. */
15413 {
15417 else
15418 {
15419 /* If we find an enum constant or a type tag,
15420 put it aside for the moment. */
15423 }
15424 }
15426 /* Get the decls in their original chain order and record in the
15427 function. This is all and only the PARM_DECLs that were
15428 pushed into scope by the loop above. */
15430 }
15431 else
15434 /* Now store the final chain of decls for the arguments
15435 as the decl-chain of the current lexical scope.
15436 Put the enumerators in as well, at the front so that
15437 DECL_ARGUMENTS is not modified. */
15442 }
15444 \f
15445 /* We have finished doing semantic analysis on DECL, but have not yet
15446 generated RTL for its body. Save away our current state, so that
15447 when we want to generate RTL later we know what to do. */
15449 static void
15451 {
15454 /* Save the language-specific per-function data so that we can
15455 get it back when we really expand this function. */
15458 /* Make a copy. */
15463 /* Clear out the bits we don't need. */
15468 }
15471 /* Set the return value of the constructor (if present). */
15473 static void
15475 {
15476 tree val;
15477 tree exprstmt;
15480 {
15481 /* Any return from a constructor will end up here. */
15487 /* Return the address of the object. */
15490 }
15491 }
15493 /* Do all the processing for the beginning of a destructor; set up the
15494 vtable pointers and cleanups for bases and members. */
15496 static void
15498 {
15499 tree compound_stmt;
15501 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
15502 issued an error message. We still want to try to process the
15503 body of the function, but initialize_vtbl_ptrs will crash if
15504 TYPE_BINFO is NULL. */
15506 {
15508 /* Make all virtual function table pointers in non-virtual base
15509 classes point to CURRENT_CLASS_TYPE's virtual function
15510 tables. */
15515 /* Clobbering an empty base is harmful if it overlays real data. */
15517 {
15521 {
15523 tree ref
15530 tf_warning_or_error);
15532 }
15533 else
15535 }
15537 /* And insert cleanups for our bases and members so that they
15538 will be properly destroyed if we throw. */
15540 }
15541 }
15543 /* At the end of every destructor we generate code to delete the object if
15544 necessary. Do that now. */
15546 static void
15548 {
15549 tree exprstmt;
15551 /* Any return from a destructor will end up here; that way all base
15552 and member cleanups will be run when the function returns. */
15556 {
15557 tree val;
15562 /* Return the address of the object. */
15565 }
15566 }
15568 /* Do the necessary processing for the beginning of a function body, which
15569 in this case includes member-initializers, but not the catch clauses of
15570 a function-try-block. Currently, this means opening a binding level
15571 for the member-initializers (in a ctor), member cleanups (in a dtor),
15572 and capture proxies (in a lambda operator()). */
15574 tree
15576 {
15577 tree stmt;
15584 else
15585 /* Always keep the BLOCK node associated with the outermost pair of
15586 curly braces of a function. These are needed for correct
15587 operation of dwarfout.c. */
15598 }
15600 /* Do the processing for the end of a function body. Currently, this means
15601 closing out the cleanups for fully-constructed bases and members, and in
15602 the case of the destructor, deleting the object if desired. Again, this
15603 is only meaningful for [cd]tors, since they are the only functions where
15604 there is a significant distinction between the main body and any
15605 function catch clauses. Handling, say, main() return semantics here
15606 would be wrong, as flowing off the end of a function catch clause for
15607 main() would also need to return 0. */
15609 void
15611 {
15615 /* Close the block. */
15624 }
15626 /* Given a function, returns the BLOCK corresponding to the outermost level
15627 of curly braces, skipping the artificial block created for constructor
15628 initializers. */
15630 tree
15632 {
15642 }
15644 /* If FNDECL is a class's key method, add the class to the list of
15645 keyed classes that should be emitted. */
15647 static void
15649 {
15653 {
15657 }
15658 }
15660 /* Subroutine of finish_function.
15661 Save the body of constexpr functions for possible
15662 future compile time evaluation. */
15664 static void
15666 {
15672 }
15674 /* Finish up a function declaration and compile that function
15675 all the way to assembler language output. The free the storage
15676 for the function definition. INLINE_P is TRUE if we just
15677 finished processing the body of an in-class inline function
15678 definition. (This processing will have taken place after the
15679 class definition is complete.) */
15681 tree
15683 {
15687 /* When we get some parse errors, we can end up without a
15688 current_function_decl, so cope. */
15701 /* TREE_READONLY (fndecl) = 1;
15702 This caused &foo to be of type ptr-to-const-function
15703 which then got a warning when stored in a ptr-to-function variable. */
15706 /* The current function is being defined, so its DECL_INITIAL should
15707 be set, and unless there's a multiple definition, it should be
15708 error_mark_node. */
15711 /* For a cloned function, we've already got all the code we need;
15712 there's no need to add any extra bits. */
15714 {
15715 /* Make it so that `main' always returns 0 by default. */
15722 current_eh_spec_block);
15723 }
15725 /* If we're saving up tree structure, tie off the function now. */
15730 /* If this function can't throw any exceptions, remember that. */
15733 && !flag_non_call_exceptions
15737 /* This must come after expand_function_end because cleanups might
15738 have declarations (from inline functions) that need to go into
15739 this function's blocks. */
15741 /* If the current binding level isn't the outermost binding level
15742 for this function, either there is a bug, or we have experienced
15743 syntax errors and the statement tree is malformed. */
15745 {
15746 /* Make sure we have already experienced errors. */
15749 /* Throw away the broken statement tree and extra binding
15750 levels. */
15754 {
15757 else
15759 }
15760 }
15763 /* Statements should always be full-expressions at the outermost set
15764 of curly braces for a function. */
15767 /* If there are no return statements in a function with auto return type,
15768 the return type is void. But if the declared type is something like
15769 auto*, this is an error. */
15772 {
15774 {
15777 }
15780 {
15782 current_function_auto_return_pattern);
15785 }
15786 }
15788 // If this is a concept, check that the definition is reasonable.
15792 /* Lambda closure members are implicitly constexpr if possible. */
15796 = ((processing_template_decl
15800 /* Save constexpr function body before it gets munged by
15801 the NRV transformation. */
15804 /* Invoke the pre-genericize plugin before we start munging things. */
15808 /* Perform delayed folding before NRV transformation. */
15812 /* Set up the named return value optimization, if we can. Candidate
15813 variables are selected in check_return_expr. */
15815 {
15817 tree outer;
15820 /* This is only worth doing for fns that return in memory--and
15821 simpler, since we don't have to worry about promoted modes. */
15823 /* Only allow this for variables declared in the outer scope of
15824 the function so we know that their lifetime always ends with a
15825 return; see g++.dg/opt/nrv6.C. We could be more flexible if
15826 we were to do this optimization in tree-ssa. */
15832 }
15834 /* Remember that we were in class scope. */
15838 /* Must mark the RESULT_DECL as being in this function. */
15841 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
15842 to the FUNCTION_DECL node itself. */
15845 /* Save away current state, if appropriate. */
15849 /* Complain if there's just no return statement. */
15854 /* Don't complain if we abort or throw. */
15855 && !current_function_returns_abnormally
15856 /* Don't complain if there's an infinite loop. */
15857 && !current_function_infinite_loop
15858 /* Don't complain if we are declared noreturn. */
15862 /* Structor return values (if any) are set by the compiler. */
15866 {
15870 }
15872 /* Store the end of the function, so that we get good line number
15873 info for the epilogue. */
15876 /* Complain about parameters that are only set, but never otherwise used. */
15878 && !processing_template_decl
15881 {
15882 tree decl;
15885 decl;
15899 OPT_Wunused_but_set_parameter,
15902 }
15904 /* Complain about locally defined typedefs that are not used in this
15905 function. */
15908 /* Possibly warn about unused parameters. */
15910 && !processing_template_decl
15914 /* Genericize before inlining. */
15916 {
15919 /* Clear out the bits we don't need. */
15929 }
15930 /* Clear out the bits we don't need. */
15933 /* We're leaving the context of this function, so zap cfun. It's still in
15934 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
15938 /* If this is an in-class inline definition, we may have to pop the
15939 bindings for the template parameters that we added in
15940 maybe_begin_member_template_processing when start_function was
15941 called. */
15945 /* Leave the scope of the class. */
15951 /* Clean up. */
15956 }
15957 \f
15958 /* Create the FUNCTION_DECL for a function definition.
15959 DECLSPECS and DECLARATOR are the parts of the declaration;
15960 they describe the return type and the name of the function,
15961 but twisted together in a fashion that parallels the syntax of C.
15963 This function creates a binding context for the function body
15964 as well as setting up the FUNCTION_DECL in current_function_decl.
15966 Returns a FUNCTION_DECL on success.
15968 If the DECLARATOR is not suitable for a function (it defines a datum
15969 instead), we return 0, which tells yyparse to report a parse error.
15971 May return void_type_node indicating that this method is actually
15972 a friend. See grokfield for more details.
15974 Came here with a `.pushlevel' .
15976 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
15977 CHANGES TO CODE IN `grokfield'. */
15979 tree
15982 {
15990 {
15993 }
15998 /* Pass friends other than inline friend functions back. */
16003 {
16008 }
16017 /* We process method specializations in finish_struct_1. */
16019 {
16023 }
16026 {
16028 {
16031 }
16032 }
16038 }
16039 \f
16041 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
16042 we can lay it out later, when and if its type becomes complete.
16044 Also handle constexpr variables where the initializer involves
16045 an unlowered PTRMEM_CST because the class isn't complete yet. */
16047 void
16049 {
16052 /* Keep track of variables with incomplete types. */
16055 {
16063 /* RTTI TD entries are created while defining the type_info. */
16066 {
16069 }
16073 {
16074 /* When the outermost open class is complete we can resolve any
16075 pointers-to-members. */
16079 }
16080 }
16081 }
16083 /* Called when a class type (given by TYPE) is defined. If there are
16084 any existing VAR_DECLs whose type has been completed by this
16085 declaration, update them now. */
16087 void
16089 {
16094 {
16096 {
16103 {
16104 /* Complete the type of the variable. The VAR_DECL itself
16105 will be laid out in expand_expr. */
16108 }
16110 /* Remove this entry from the list. */
16112 }
16113 else
16114 ix++;
16115 }
16117 /* Check for pending declarations which may have abstract type. */
16119 }
16121 /* If DECL is of a type which needs a cleanup, build and return an
16122 expression to perform that cleanup here. Return NULL_TREE if no
16123 cleanup need be done. DECL can also be a _REF when called from
16124 split_nonconstant_init_1. */
16126 tree
16128 {
16129 tree type;
16130 tree attr;
16131 tree cleanup;
16133 /* Assume no cleanup is required. */
16139 /* Handle "__attribute__((cleanup))". We run the cleanup function
16140 before the destructor since the destructor is what actually
16141 terminates the lifetime of the object. */
16144 else
16147 {
16148 tree id;
16149 tree fn;
16150 tree arg;
16152 /* Get the name specified by the user for the cleanup function. */
16154 /* Look up the name to find the cleanup function to call. It is
16155 important to use lookup_name here because that is what is
16156 used in c-common.c:handle_cleanup_attribute when performing
16157 initial checks on the attribute. Note that those checks
16158 include ensuring that the function found is not an overloaded
16159 function, or an object with an overloaded call operator,
16160 etc.; we can rely on the fact that the function found is an
16161 ordinary FUNCTION_DECL. */
16169 }
16170 /* Handle ordinary C++ destructors. */
16173 {
16175 tree addr;
16176 tree call;
16180 else
16191 else
16193 }
16195 /* build_delete sets the location of the destructor call to the
16196 current location, even though the destructor is going to be
16197 called later, at the end of the current scope. This can lead to
16198 a "jumpy" behavior for users of debuggers when they step around
16199 the end of the block. So let's unset the location of the
16200 destructor call instead. */
16206 /* Treat objects with destructors as used; the destructor may do
16207 something substantive. */
16212 }
16214 \f
16215 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
16216 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
16217 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
16219 tree
16221 {
16222 tree fntype;
16223 tree args;
16237 fntype = (cp_build_type_attribute_variant
16239 fntype = (build_exception_variant
16244 }
16246 /* DECL was originally constructed as a non-static member function,
16247 but turned out to be static. Update it accordingly. */
16249 void
16251 {
16264 }
16266 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
16267 one of the language-independent trees. */
16269 enum cp_tree_node_structure_enum
16271 {
16273 {
16290 }
16291 }
16293 /* Build the void_list_node (void_type_node having been created). */
16294 tree
16296 {
16299 }
16301 bool
16303 {
16304 /* A missing noreturn is ok for the `main' function. */
16306 }
16308 /* Return the decl used to identify the COMDAT group into which DECL should
16309 be placed. */
16311 tree
16313 {
16314 /* Virtual tables, construction virtual tables, and virtual table
16315 tables all go in a single COMDAT group, named after the primary
16316 virtual table. */
16319 /* For all other DECLs, the COMDAT group is the mangled name of the
16320 declaration itself. */
16321 else
16322 {
16324 {
16325 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
16326 into the same section as the target function. In that case
16327 we must return target's name. */
16333 else
16335 }
16336 }
16339 }
16341 /* Returns the return type for FN as written by the user, which may include
16342 a placeholder for a deduced return type. */
16344 tree
16346 {
16349 {
16356 }
16358 }
16360 /* Returns true iff DECL is a variable or function declared with an auto type
16361 that has not yet been deduced to a real type. */
16363 bool
16365 {
16371 }
16373 /* Complain if DECL has an undeduced return type. */
16375 bool
16377 {
16379 {
16383 }
16385 }