| blob | 83e060b4d11723d7eb6c1e5e72d39721746607a0 |
1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988-2015 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. */
82 /* Possible cases of bad specifiers type used by bad_specifiers. */
87 BSP_FIELD /* field */
88 };
131 static tree check_special_function_return_type
139 /* The following symbols are subsumed in the cp_global_trees array, and
140 listed here individually for documentation purposes.
142 C++ extensions
143 tree wchar_decl_node;
145 tree vtable_entry_type;
146 tree delta_type_node;
147 tree __t_desc_type_node;
149 tree class_type_node;
150 tree unknown_type_node;
152 Array type `vtable_entry_type[]'
154 tree vtbl_type_node;
155 tree vtbl_ptr_type_node;
157 Namespaces,
159 tree std_node;
160 tree abi_node;
162 A FUNCTION_DECL which can call `abort'. Not necessarily the
163 one that the user will declare, but sufficient to be called
164 by routines that want to abort the program.
166 tree abort_fndecl;
168 Used by RTTI
169 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
170 tree tinfo_var_id; */
174 /* Indicates that there is a type value in some namespace, although
175 that is not necessarily in scope at the moment. */
177 tree global_type_node;
179 /* The node that holds the "name" of the global scope. */
180 tree global_scope_name;
182 #define local_names cp_function_chain->x_local_names
184 /* A list of objects which have constructors or destructors
185 which reside in the global scope. The decl is stored in
186 the TREE_VALUE slot and the initializer is stored
187 in the TREE_PURPOSE slot. */
188 tree static_aggregates;
190 /* Like static_aggregates, but for thread_local variables. */
191 tree tls_aggregates;
193 /* -- end of C++ */
195 /* A node for the integer constant 2. */
197 tree integer_two_node;
199 /* Used only for jumps to as-yet undefined labels, since jumps to
200 defined labels can have their validity checked immediately. */
204 /* The binding level to which this entry is *currently* attached.
205 This is initially the binding level in which the goto appeared,
206 but is modified as scopes are closed. */
208 /* The head of the names list that was current when the goto appeared,
209 or the inner scope popped. These are the decls that will *not* be
210 skipped when jumping to the label. */
211 tree names_in_scope;
212 /* The location of the goto, for error reporting. */
213 location_t o_goto_locus;
214 /* True if an OpenMP structured block scope has been closed since
215 the goto appeared. This means that the branch from the label will
216 illegally exit an OpenMP scope. */
218 };
220 /* A list of all LABEL_DECLs in the function that have names. Here so
221 we can clear out their names' definitions at the end of the
222 function, and so we can check the validity of jumps to these labels. */
225 /* The decl itself. */
226 tree label_decl;
228 /* The binding level to which the label is *currently* attached.
229 This is initially set to the binding level in which the label
230 is defined, but is modified as scopes are closed. */
232 /* The head of the names list that was current when the label was
233 defined, or the inner scope popped. These are the decls that will
234 be skipped when jumping to the label. */
235 tree names_in_scope;
236 /* A vector of all decls from all binding levels that would be
237 crossed by a backward branch to the label. */
240 /* A list of uses of the label, before the label is defined. */
243 /* The following bits are set after the label is defined, and are
244 updated as scopes are popped. They indicate that a backward jump
245 to the label will illegally enter a scope of the given flavor. */
249 };
251 #define named_labels cp_function_chain->x_named_labels
252 \f
253 /* The number of function bodies which we are currently processing.
254 (Zero if we are at namespace scope, one inside the body of a
255 function, two inside the body of a function in a local class, etc.) */
258 /* To avoid unwanted recursion, finish_function defers all mark_used calls
259 encountered during its execution until it finishes. */
263 /* States indicating how grokdeclarator() should handle declspecs marked
264 with __attribute__((deprecated)). An object declared as
265 __attribute__((deprecated)) suppresses warnings of uses of other
266 deprecated items. */
269 \f
270 /* A list of VAR_DECLs whose type was incomplete at the time the
271 variable was declared. */
274 tree decl;
275 tree incomplete_type;
280 \f
281 /* Returns the kind of template specialization we are currently
282 processing, given that it's declaration contained N_CLASS_SCOPES
283 explicit scope qualifications. */
285 tmpl_spec_kind
287 {
293 /* Scan through the template parameter scopes. */
297 {
298 /* If we see a specialization scope inside a parameter scope,
299 then something is wrong. That corresponds to a declaration
300 like:
302 template <class T> template <> ...
304 which is always invalid since [temp.expl.spec] forbids the
305 specialization of a class member template if the enclosing
306 class templates are not explicitly specialized as well. */
308 {
311 else
313 }
318 }
320 /* Handle explicit instantiations. */
322 {
324 /* We've seen a template parameter list during an explicit
325 instantiation. For example:
327 template <class T> template void f(int);
329 This is erroneous. */
331 else
333 }
336 /* We've not seen enough template headers to match all the
337 specialized classes present. For example:
339 template <class T> void R<T>::S<T>::f(int);
341 This is invalid; there needs to be one set of template
342 parameters for each class. */
345 /* We're processing a non-template declaration (even though it may
346 be a member of a template class.) For example:
348 template <class T> void S<T>::f(int);
350 The `class T' matches the `S<T>', leaving no template headers
351 corresponding to the `f'. */
354 /* We've got too many template headers. For example:
356 template <> template <class T> void f (T);
358 There need to be more enclosing classes. */
360 else
361 /* This must be a template. It's of the form:
363 template <class T> template <class U> void S<T>::f(U);
365 This is a specialization if the innermost level was a
366 specialization; otherwise it's just a definition of the
367 template. */
369 }
371 /* Exit the current scope. */
373 void
375 {
377 }
379 /* When a label goes out of scope, check to see if that label was used
380 in a valid manner, and issue any appropriate warnings or errors. */
382 static void
384 {
386 {
388 {
389 location_t location;
393 /* FIXME want (LOCATION_FILE (input_location), (line)0) */
394 /* Avoid crashing later. */
396 }
397 else
399 }
402 }
404 /* At the end of a function, all labels declared within the function
405 go out of scope. BLOCK is the top-level block for the
406 function. */
408 int
410 {
415 /* Put the labels into the "variables" of the top-level block,
416 so debugger can see them. */
423 }
425 static void
427 {
429 {
432 }
433 }
435 /* At the end of a block with local labels, restore the outer definition. */
437 static void
439 {
447 }
449 /* The following two routines are used to interface to Objective-C++.
450 The binding level is purposely treated as an opaque type. */
454 {
456 }
458 /* The following routine is used by the NeXT-style SJLJ exceptions;
459 variables get marked 'volatile' so as to not be clobbered by
460 _setjmp()/_longjmp() calls. All variables in the current scope,
461 as well as parent scopes up to (but not including) ENCLOSING_BLK
462 shall be thusly marked. */
464 void
466 {
472 {
473 tree decl;
478 /* Do not climb up past the current function. */
481 }
482 }
484 /* Update data for defined and undefined labels when leaving a scope. */
486 int
488 {
493 {
494 tree decl;
496 /* ENT->NAMES_IN_SCOPE may contain a mixture of DECLs and
497 TREE_LISTs representing OVERLOADs, so be careful. */
507 {
519 }
520 }
522 {
527 {
532 }
533 }
536 }
538 /* Saved errorcount to avoid -Wunused-but-set-{parameter,variable} warnings
539 when errors were reported, except for -Werror-unused-but-set-*. */
542 /* Exit a binding level.
543 Pop the level off, and restore the state of the identifier-decl mappings
544 that were in effect when this level was entered.
546 If KEEP == 1, this level had explicit declarations, so
547 and create a "block" (a BLOCK node) for the level
548 to record its declarations and subblocks for symbol table output.
550 If FUNCTIONBODY is nonzero, this level is the body of a function,
551 so create a block as if KEEP were set and also clear out all
552 label names.
554 If REVERSE is nonzero, reverse the order of decls before putting
555 them into the BLOCK. */
557 tree
559 {
560 tree link;
561 /* The chain of decls was accumulated in reverse order.
562 Put it into forward order, just for cleanliness. */
563 tree decls;
564 tree subblocks;
565 tree block;
566 tree decl;
568 scope_kind kind;
573 restart:
585 /* We used to use KEEP == 2 to indicate that the new block should go
586 at the beginning of the list of blocks at this binding level,
587 rather than the end. This hack is no longer used. */
593 /* Any uses of undefined labels, and any defined labels, now operate
594 under constraints of next binding contour. */
599 /* Get the decls in the order they were written.
600 Usually current_binding_level->names is in reverse order.
601 But parameter decls were previously put in forward order. */
604 current_binding_level->names
606 else
609 /* If there were any declarations or structure tags in that level,
610 or if this level is a function body,
611 create a BLOCK to record them for the life of this function. */
613 /* Avoid function body block if possible. */
619 {
622 }
624 /* In each subblock, record that this is its superior. */
629 /* We still support the old for-scope rules, whereby the variables
630 in a for-init statement were in scope after the for-statement
631 ended. We only use the new rules if flag_new_for_scope is
632 nonzero. */
633 leaving_for_scope
636 /* Before we remove the declarations first check for unused variables. */
641 {
642 /* There are cases where D itself is a TREE_LIST. See in
643 push_local_binding where the list of decls returned by
644 getdecls is built. */
656 {
660 // For -Wunused-but-set-variable leave references alone.
663 {
667 }
668 }
669 }
671 /* Remove declarations for all the DECLs in this level. */
673 {
675 /* It's hard to make this ARM compatibility hack play nicely with
676 lambdas, and it really isn't necessary in C++11 mode. */
679 {
682 tree ns_binding;
689 else
693 /* We have something like:
695 int i;
696 for (int i; ;);
698 and we are leaving the `for' scope. There's no reason to
699 keep the binding of the inner `i' in this case. */
703 /* Here, we have something like:
705 typedef int I;
707 void f () {
708 for (int I; ;);
709 }
711 We must pop the for-scope binding so we know what's a
712 type and what isn't. */
714 else
715 {
716 /* Mark this VAR_DECL as dead so that we can tell we left it
717 there only for backward compatibility. */
720 /* Keep track of what should have happened when we
721 popped the binding. */
723 {
726 }
728 /* Add it to the list of dead variables in the next
729 outermost binding to that we can remove these when we
730 leave that binding. */
733 link);
735 /* Although we don't pop the cxx_binding, we do clear
736 its SCOPE since the scope is going away now. */
739 }
740 }
741 else
742 {
743 tree name;
745 /* Remove the binding. */
757 }
758 }
760 /* Remove declarations for any `for' variables from inner scopes
761 that we kept around. */
766 /* Restore the IDENTIFIER_TYPE_VALUEs. */
771 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
776 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
777 list if a `using' declaration put them there. The debugging
778 back ends won't understand OVERLOAD, so we remove them here.
779 Because the BLOCK_VARS are (temporarily) shared with
780 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
781 popped all the bindings. */
783 {
787 {
790 else
792 }
793 }
795 /* If the level being exited is the top level of a function,
796 check over all the labels. */
798 {
800 {
801 /* Since this is the top level block of a function, the vars are
802 the function's parameters. Don't leave them in the BLOCK
803 because they are found in the FUNCTION_DECL instead. */
806 }
807 else
809 }
813 {
814 tree stmt;
816 /* If this is a temporary binding created for a cleanup, then we'll
817 have pushed a statement list level. Pop that, create a new
818 BIND_EXPR for the block, and insert it into the stream. */
822 }
826 {
827 /* The current function is being defined, so its DECL_INITIAL
828 should be error_mark_node. */
832 {
834 {
837 }
838 else
840 }
841 }
843 current_binding_level->blocks
846 /* If we did not make a block for the level just exited,
847 any blocks made for inner levels
848 (since they cannot be recorded as subblocks in that level)
849 must be carried forward so they will later become subblocks
850 of something else. */
852 current_binding_level->blocks
855 /* Each and every BLOCK node created here in `poplevel' is important
856 (e.g. for proper debugging information) so if we created one
857 earlier, mark it as "used". */
861 /* All temporary bindings created for cleanups are popped silently. */
867 }
869 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
870 itself, calling F for each. The DATA is passed to F as well. */
872 static int
874 {
884 }
886 /* Walk all the namespaces, calling F for each. The DATA is passed to
887 F as well. */
889 int
891 {
893 }
895 /* Call wrapup_globals_declarations for the globals in NAMESPACE. If
896 DATA is non-NULL, this is the last time we will call
897 wrapup_global_declarations for this NAMESPACE. */
899 int
901 {
909 {
913 }
915 /* Write out any globals that need to be output. */
917 }
919 \f
920 /* In C++, you don't have to write `struct S' to refer to `S'; you
921 can just use `S'. We accomplish this by creating a TYPE_DECL as
922 if the user had written `typedef struct S S'. Create and return
923 the TYPE_DECL for TYPE. */
925 tree
927 {
928 tree decl;
932 /* There are other implicit type declarations, like the one *within*
933 a class that allows you to write `S::S'. We must distinguish
934 amongst these. */
940 }
942 /* Remember a local name for name-mangling purposes. */
944 static void
946 {
956 {
959 {
965 else
971 }
972 }
976 }
977 \f
978 /* Subroutine of duplicate_decls: return truthvalue of whether
979 or not types of these decls match.
981 For C++, we must compare the parameter list so that `int' can match
982 `int&' in a parameter position, but `int&' is not confused with
983 `const int&'. */
985 int
987 {
994 /* If the two DECLs are not even the same kind of thing, we're not
995 interested in their types. */
1001 {
1006 tree r2;
1008 /* Specializations of different templates are different functions
1009 even if they have the same type. */
1024 /* A new declaration doesn't match a built-in one unless it
1025 is also extern "C". */
1033 /* A declaration with deduced return type should use its pre-deduction
1034 type for declaration matching. */
1038 {
1041 #ifndef NO_IMPLICIT_EXTERN_C
1044 #endif
1045 ))
1046 {
1050 }
1051 #ifndef NO_IMPLICIT_EXTERN_C
1059 {
1062 }
1063 #endif
1064 else
1065 types_match =
1071 }
1072 else
1075 /* The decls dont match if they correspond to two different versions
1076 of the same function. Disallow extern "C" functions to be
1077 versions for now. */
1082 {
1083 /* Mark functions as versions if necessary. Modify the mangled decl
1084 name if necessary. */
1089 {
1093 }
1095 {
1099 }
1102 }
1103 }
1105 {
1117 else
1120 }
1121 else
1122 {
1123 /* Need to check scope for variable declaration (VAR_DECL).
1124 For typedef (TYPE_DECL), scope is ignored. */
1127 /* [dcl.link]
1128 Two declarations for an object with C language linkage
1129 with the same name (ignoring the namespace that qualify
1130 it) that appear in different namespace scopes refer to
1131 the same object. */
1141 else
1144 COMPARE_REDECLARATION);
1145 }
1148 }
1150 /* If NEWDECL is `static' and an `extern' was seen previously,
1151 warn about it. OLDDECL is the previous declaration.
1153 Note that this does not apply to the C++ case of declaring
1154 a variable `extern const' and then later `const'.
1156 Don't complain about built-in functions, since they are beyond
1157 the user's control. */
1159 void
1161 {
1168 /* Don't get confused by static member functions; that's a different
1169 use of `static'. */
1174 /* If the old declaration was `static', or the new one isn't, then
1175 everything is OK. */
1179 /* It's OK to declare a builtin function as `static'. */
1187 }
1189 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1190 function templates. If their exception specifications do not
1191 match, issue a diagnostic. */
1193 static void
1195 tree old_decl)
1196 {
1200 /* Two default specs are equivalent, don't force evaluation. */
1210 /* [except.spec]
1212 If any declaration of a function has an exception-specification,
1213 all declarations, including the definition and an explicit
1214 specialization, of that function shall have an
1215 exception-specification with the same set of type-ids. */
1218 && flag_exceptions
1220 {
1222 new_decl);
1224 }
1225 }
1227 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1228 Otherwise issue diagnostics. */
1230 static bool
1232 {
1242 {
1244 {
1245 /* Hide a built-in declaration. */
1249 }
1250 /* 7.1.5 [dcl.constexpr]
1251 Note: An explicit specialization can differ from the template
1252 declaration with respect to the constexpr specifier. */
1260 }
1262 }
1264 /* DECL is a redeclaration of a function or function template. If
1265 it does have default arguments issue a diagnostic. Note: this
1266 function is used to enforce the requirements in C++11 8.3.6 about
1267 no default arguments in redeclarations. */
1269 static void
1271 {
1277 {
1279 "redeclaration of %q#D may not have default "
1282 }
1283 }
1285 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1287 DECL_ATTRIBUTES (fn)))
1289 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1290 If the redeclaration is invalid, a diagnostic is issued, and the
1291 error_mark_node is returned. Otherwise, OLDDECL is returned.
1293 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1294 returned.
1296 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1298 tree
1300 {
1304 tree new_template_info;
1311 /* If either the type of the new decl or the type of the old decl is an
1312 error_mark_node, then that implies that we have already issued an
1313 error (earlier) for some bogus type specification, and in that case,
1314 it is rather pointless to harass the user with yet more error message
1315 about the same declaration, so just pretend the types match here. */
1322 {
1333 }
1339 {
1351 {
1353 newdecl))
1356 olddecl);
1357 }
1361 {
1366 olddecl);
1367 }
1368 }
1370 /* Check for redeclaration and other discrepancies. */
1373 {
1376 {
1377 /* Avoid warnings redeclaring built-ins which have not been
1378 explicitly declared. */
1382 /* If you declare a built-in or predefined function name as static,
1383 the old definition is overridden, but optionally warn this was a
1384 bad choice of name. */
1386 {
1391 /* Discard the old built-in function. */
1393 }
1394 /* If the built-in is not ansi, then programs can override
1395 it even globally without an error. */
1399 else
1403 }
1405 {
1412 }
1414 {
1415 /* Avoid warnings redeclaring built-ins which have not been
1416 explicitly declared. */
1418 {
1419 /* Deal with fileptr_type_node. FILE type is not known
1420 at the time we create the builtins. */
1430 {
1437 {
1445 newdecl_is_friend);
1447 }
1448 }
1451 }
1456 {
1457 /* A near match; override the builtin. */
1462 else
1467 }
1468 else
1469 /* Discard the old built-in function. */
1472 /* Replace the old RTL to avoid problems with inlining. */
1474 }
1475 /* Even if the types match, prefer the new declarations type for
1476 built-ins which have not been explicitly declared, for
1477 exception lists, etc... */
1479 {
1486 }
1488 /* If a function is explicitly declared "throw ()", propagate that to
1489 the corresponding builtin. */
1494 {
1499 }
1501 /* Whether or not the builtin can throw exceptions has no
1502 bearing on this declarator. */
1506 {
1507 /* If a builtin function is redeclared as `static', merge
1508 the declarations, but make the original one static. */
1512 /* Make the old declaration consistent with the new one so
1513 that all remnants of the builtin-ness of this function
1514 will be banished. */
1517 }
1518 }
1520 {
1521 /* C++ Standard, 3.3, clause 4:
1522 "[Note: a namespace name or a class template name must be unique
1523 in its declarative region (7.3.2, clause 14). ]" */
1530 {
1535 {
1536 /* We do nothing special here, because C++ does such nasty
1537 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1538 get shadowed, and know that if we need to find a TYPE_DECL
1539 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1540 slot of the identifier. */
1542 }
1549 }
1558 }
1560 {
1562 /* These are certainly not duplicate declarations; they're
1563 from different scopes. */
1567 {
1568 /* The name of a class template may not be declared to refer to
1569 any other template, class, function, object, namespace, value,
1570 or type in the same scope. */
1573 {
1578 }
1585 /* Template functions can be disambiguated by
1586 return type. */
1589 {
1593 }
1595 }
1597 {
1599 {
1601 newdecl);
1605 }
1606 /* For function versions, params and types match, but they
1607 are not ambiguous. */
1612 {
1617 }
1618 else
1620 }
1621 else
1622 {
1627 }
1628 }
1638 /* It's OK to have a template specialization and a non-template
1639 with the same type, or to have specializations of two
1640 different templates with the same type. Note that if one is a
1641 specialization, and the other is an instantiation of the same
1642 template, that we do not exit at this point. That situation
1643 can occur if we instantiate a template class, and then
1644 specialize one of its methods. This situation is valid, but
1645 the declarations must be merged in the usual way. */
1652 /* One of the declarations is a template instantiation, and the
1653 other is not a template at all. That's OK. */
1656 {
1657 /* In [namespace.alias] we have:
1659 In a declarative region, a namespace-alias-definition can be
1660 used to redefine a namespace-alias declared in that declarative
1661 region to refer only to the namespace to which it already
1662 refers.
1664 Therefore, if we encounter a second alias directive for the same
1665 alias, we can just ignore the second directive. */
1670 /* [namespace.alias]
1672 A namespace-name or namespace-alias shall not be declared as
1673 the name of any other entity in the same declarative region.
1674 A namespace-name defined at global scope shall not be
1675 declared as the name of any other entity in any global scope
1676 of the program. */
1681 }
1682 else
1683 {
1686 {
1694 }
1699 {
1700 /* Prototype decl follows defn w/o prototype. */
1705 }
1708 {
1709 /* [dcl.link]
1710 If two declarations of the same function or object
1711 specify different linkage-specifications ..., the program
1712 is ill-formed.... Except for functions with C++ linkage,
1713 a function declaration without a linkage specification
1714 shall not precede the first linkage specification for
1715 that function. A function can be declared without a
1716 linkage specification after an explicit linkage
1717 specification has been seen; the linkage explicitly
1718 specified in the earlier declaration is not affected by
1719 such a function declaration.
1721 DR 563 raises the question why the restrictions on
1722 functions should not also apply to objects. Older
1723 versions of G++ silently ignore the linkage-specification
1724 for this example:
1726 namespace N {
1727 extern int i;
1728 extern "C" int i;
1729 }
1731 which is clearly wrong. Therefore, we now treat objects
1732 like functions. */
1734 {
1735 /* There is no explicit linkage-specification, so we use
1736 the linkage from the previous declaration. */
1740 }
1741 else
1742 {
1748 }
1749 }
1752 ;
1754 {
1755 /* Note: free functions, as TEMPLATE_DECLs, are handled below. */
1758 as FUNCTION_DECLs. */
1760 /* C++11 8.3.6/6.
1761 Default arguments for a member function of a class
1762 template shall be specified on the initial declaration
1763 of the member function within the class template. */
1766 else
1767 {
1775 {
1778 {
1780 "default argument given for parameter "
1784 olddecl);
1785 }
1786 else
1787 {
1792 olddecl);
1793 }
1794 }
1795 }
1796 }
1797 }
1799 /* Do not merge an implicit typedef with an explicit one. In:
1801 class A;
1802 ...
1803 typedef class A A __attribute__ ((foo));
1805 the attribute should apply only to the typedef. */
1811 /* If new decl is `static' and an `extern' was seen previously,
1812 warn about it. */
1818 /* We have committed to returning 1 at this point. */
1820 {
1821 /* Now that functions must hold information normally held
1822 by field decls, there is extra work to do so that
1823 declaration information does not get destroyed during
1824 definition. */
1838 SET_OVERLOADED_OPERATOR_CODE
1842 /* Optionally warn about more than one declaration for the same
1843 name, but don't warn about a function declaration followed by a
1844 definition. */
1847 /* Don't warn about extern decl followed by definition. */
1849 /* Don't warn about friends, let add_friend take care of it. */
1851 /* Don't warn about declaration followed by specialization. */
1854 {
1857 newdecl))
1860 }
1864 {
1866 {
1870 }
1872 }
1873 }
1875 /* Deal with C++: must preserve virtual function table size. */
1877 {
1887 }
1889 /* Copy all the DECL_... slots specified in the new decl
1890 except for any that we copy here from the old type. */
1895 {
1901 {
1904 }
1905 }
1908 {
1909 tree old_result;
1910 tree new_result;
1922 {
1923 /* Per C++11 8.3.6/4, default arguments cannot be added in later
1924 declarations of a function template. */
1931 {
1934 else
1946 }
1947 else
1948 {
1954 }
1955 }
1957 /* If the new declaration is a definition, update the file and
1958 line information on the declaration, and also make
1959 the old declaration the same definition. */
1961 {
1967 {
1968 tree parm;
1974 }
1975 }
1978 }
1981 {
1985 /* Automatically handles default parameters. */
1987 tree newtype;
1989 /* For typedefs use the old type, as the new type's DECL_NAME points
1990 at newdecl, which will be ggc_freed. */
1993 else
1994 /* Merge the data types specified in the two decls. */
1998 {
2006 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
2009 {
2010 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
2015 }
2016 }
2023 /* Lay the type out, unless already done. */
2037 /* Merge the type qualifiers. */
2045 /* Merge deprecatedness. */
2049 /* Preserve function specific target and optimization options */
2051 {
2061 }
2063 /* Merge the initialization information. */
2066 {
2070 {
2073 }
2074 }
2077 {
2089 /* Keep the old RTL. */
2091 }
2094 {
2095 /* Keep the old RTL. We cannot keep the old RTL if the old
2096 declaration was for an incomplete object and the new
2097 declaration is not since many attributes of the RTL will
2098 change. */
2100 }
2101 }
2102 /* If cannot merge, then use the new type and qualifiers,
2103 and don't preserve the old rtl. */
2104 else
2105 {
2106 /* Clean out any memory we had of the old declaration. */
2115 }
2117 /* Merge the storage class information. */
2128 {
2137 {
2144 }
2147 {
2151 }
2156 /* If the OLDDECL is an instantiation and/or specialization,
2157 then the NEWDECL must be too. But, it may not yet be marked
2158 as such if the caller has created NEWDECL, but has not yet
2159 figured out that it is a redeclaration. */
2163 /* Don't really know how much of the language-specific
2164 values we should copy from old to new. */
2171 {
2175 {
2179 /* Remember the presence of explicit specialization args. */
2182 }
2184 }
2185 /* Only functions have these fields. */
2187 {
2192 /* DECL_THUNKS is only valid for virtual functions,
2193 otherwise it is a DECL_FRIEND_CONTEXT. */
2196 }
2197 /* Only variables have this field. */
2201 }
2204 {
2205 tree parm;
2207 /* Merge parameter attributes. */
2216 }
2220 {
2221 /* If newdecl is not a specialization, then it is not a
2222 template-related function at all. And that means that we
2223 should have exited above, returning 0. */
2227 /* From [temp.expl.spec]:
2229 If a template, a member template or the member of a class
2230 template is explicitly specialized then that
2231 specialization shall be declared before the first use of
2232 that specialization that would cause an implicit
2233 instantiation to take place, in every translation unit in
2234 which such a use occurs. */
2236 olddecl);
2242 /* Don't propagate visibility from the template to the
2243 specialization here. We'll do that in determine_visibility if
2244 appropriate. */
2247 /* [temp.expl.spec/14] We don't inline explicit specialization
2248 just because the primary template says so. */
2250 /* But still keep DECL_DISREGARD_INLINE_LIMITS in sync with
2251 the always_inline attribute. */
2254 {
2257 else
2261 }
2262 }
2264 {
2265 /* Never inline re-defined extern inline functions.
2266 FIXME: this could be better handled by keeping both
2267 function as separate declarations. */
2269 }
2270 else
2271 {
2284 }
2286 /* Preserve abstractness on cloned [cd]tors. */
2289 /* Update newdecl's parms to point at olddecl. */
2295 {
2299 }
2301 {
2302 /* These need to be copied so that the names are available.
2303 Note that if the types do match, we'll preserve inline
2304 info and other bits, but if not, we won't. */
2307 }
2308 /* If redeclaring a builtin function, it stays built in
2309 if newdecl is a gnu_inline definition, or if newdecl is just
2310 a declaration. */
2313 {
2316 /* If we're keeping the built-in definition, keep the rtl,
2317 regardless of declaration matches. */
2320 {
2323 {
2324 /* If a compatible prototype of these builtin functions
2325 is seen, assume the runtime implements it with the
2326 expected semantics. */
2335 }
2336 }
2337 }
2339 /* If defining a function declared with other language
2340 linkage, use the previously declared language linkage. */
2343 {
2345 /* Don't clear out the arguments if we're just redeclaring a
2346 function. */
2349 }
2350 }
2354 /* Now preserve various other info from the definition. */
2360 /* Warn about conflicting visibility specifications. */
2364 {
2366 "%qD: visibility attribute ignored because it "
2370 }
2371 /* Choose the declaration which specified visibility. */
2373 {
2376 }
2377 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2378 so keep this behavior. */
2380 {
2383 }
2384 /* Likewise for DECL_ALIGN, DECL_USER_ALIGN and DECL_PACKED. */
2386 {
2389 }
2394 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2395 with that from NEWDECL below. */
2397 {
2401 }
2403 /* Merge the USED information. */
2409 {
2414 }
2420 /* Merge the DECL_FUNCTION_VERSIONED information. newdecl will be copied
2421 to olddecl and deleted. */
2424 {
2425 /* Set the flag for newdecl so that it gets copied to olddecl. */
2427 /* newdecl will be purged after copying to olddecl and is no longer
2428 a version. */
2430 }
2433 {
2447 /* Preserve symtab node mapping. */
2451 /* If newdecl is a template instantiation, it is possible that
2452 the following sequence of events has occurred:
2454 o A friend function was declared in a class template. The
2455 class template was instantiated.
2457 o The instantiation of the friend declaration was
2458 recorded on the instantiation list, and is newdecl.
2460 o Later, however, instantiate_class_template called pushdecl
2461 on the newdecl to perform name injection. But, pushdecl in
2462 turn called duplicate_decls when it discovered that another
2463 declaration of a global function with the same name already
2464 existed.
2466 o Here, in duplicate_decls, we decided to clobber newdecl.
2468 If we're going to do that, we'd better make sure that
2469 olddecl, and not newdecl, is on the list of
2470 instantiations so that if we try to do the instantiation
2471 again we won't get the clobbered declaration. */
2473 new_template_info,
2474 olddecl);
2475 }
2476 else
2477 {
2484 {
2492 {
2504 }
2512 }
2513 }
2517 {
2521 {
2522 /* Merge the section attribute.
2523 We want to issue an error if the sections conflict but that must be
2524 done later in decl_attributes since we are called before attributes
2525 are assigned. */
2530 {
2534 else
2538 }
2539 }
2544 }
2550 {
2553 }
2555 /* NEWDECL contains the merged attribute lists.
2556 Update OLDDECL to be the same. */
2559 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2560 so that encode_section_info has a chance to look at the new decl
2561 flags and attributes. */
2568 /* The NEWDECL will no longer be needed. Because every out-of-class
2569 declaration of a member results in a call to duplicate_decls,
2570 freeing these nodes represents in a significant savings.
2572 Before releasing the node, be sore to remove function from symbol
2573 table that might have been inserted there to record comdat group.
2574 Be sure to however do not free DECL_STRUCT_FUNCTION becuase this
2575 structure is shared in between newdecl and oldecl. */
2580 {
2584 }
2588 }
2589 \f
2590 /* Return zero if the declaration NEWDECL is valid
2591 when the declaration OLDDECL (assumed to be for the same name)
2592 has already been seen.
2593 Otherwise return an error message format string with a %s
2594 where the identifier should go. */
2598 {
2600 {
2601 /* Because C++ can put things into name space for free,
2602 constructs like "typedef struct foo { ... } foo"
2603 would look like an erroneous redeclaration. */
2606 else
2608 }
2610 {
2611 /* If this is a pure function, its olddecl will actually be
2612 the original initialization to `0' (which we force to call
2613 abort()). Don't complain about redefinition in this case. */
2618 /* If both functions come from different namespaces, this is not
2619 a redeclaration - this is a conflict with a used function. */
2625 /* We'll complain about linkage mismatches in
2626 warn_extern_redeclared_static. */
2628 /* Defining the same name twice is no good. */
2631 {
2637 }
2640 {
2645 {
2649 else
2652 }
2653 }
2655 check_abi_tag_redeclaration
2660 }
2662 {
2666 {
2671 }
2689 {
2694 {
2698 else
2701 }
2702 }
2704 /* Core issue #226 (C++0x):
2706 If a friend function template declaration specifies a
2707 default template-argument, that declaration shall be a
2708 definition and shall be the only declaration of the
2709 function template in the translation unit. */
2720 }
2726 {
2727 /* Only variables can be thread-local, and all declarations must
2728 agree on this property. */
2732 else
2735 }
2737 {
2738 /* The objects have been declared at namespace scope. If either
2739 is a member of an anonymous union, then this is an invalid
2740 redeclaration. For example:
2742 int i;
2743 union { int i; };
2745 is invalid. */
2749 /* If at least one declaration is a reference, there is no
2750 conflict. For example:
2752 int i = 3;
2753 extern int i;
2755 is valid. */
2758 /* Reject two definitions. */
2760 }
2761 else
2762 {
2763 /* Objects declared with block scope: */
2764 /* Reject two definitions, and reject a definition
2765 together with an external reference. */
2769 }
2770 }
2771 \f
2772 /* Hash and equality functions for the named_label table. */
2774 hashval_t
2776 {
2778 }
2780 bool
2782 {
2784 }
2786 /* Create a new label, named ID. */
2788 static tree
2790 {
2792 tree decl;
2800 /* Say where one reference is to the label, for the sake of the
2801 error if it is not defined. */
2804 /* Record the fact that this identifier is bound to this label. */
2807 /* Create the label htab for the function on demand. */
2811 /* Record this label on the list of labels used in this function.
2812 We do this before calling make_label_decl so that we get the
2813 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2822 }
2824 /* Look for a label named ID in the current function. If one cannot
2825 be found, create one. (We keep track of used, but undefined,
2826 labels, and complain about them at the end of a function.) */
2828 static tree
2830 {
2831 tree decl;
2833 /* You can't use labels at global scope. */
2835 {
2838 }
2840 /* See if we've already got this label. */
2847 }
2849 /* Wrapper for lookup_label_1. */
2851 tree
2853 {
2854 tree ret;
2859 }
2861 /* Declare a local label named ID. */
2863 tree
2865 {
2866 tree decl;
2867 cp_label_binding bind;
2869 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2870 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2878 }
2880 /* Returns nonzero if it is ill-formed to jump past the declaration of
2881 DECL. Returns 2 if it's also a real problem. */
2883 static int
2885 {
2886 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
2887 with automatic storage duration is not in scope to a point where it is
2888 in scope is ill-formed unless the variable has scalar type, class type
2889 with a trivial default constructor and a trivial destructor, a
2890 cv-qualified version of one of these types, or an array of one of the
2891 preceding types and is declared without an initializer (8.5). */
2906 }
2908 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2910 static bool
2912 {
2919 }
2921 /* Check that a single previously seen jump to a newly defined label
2922 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2923 the jump context; NAMES are the names in scope in LEVEL at the jump
2924 context; LOCUS is the source position of the jump or 0. Returns
2925 true if all is well. */
2927 static bool
2930 {
2936 {
2941 }
2944 {
2950 {
2956 {
2959 }
2961 {
2965 else
2968 }
2969 }
2974 {
2976 {
2979 }
2981 {
2984 else
2986 }
2988 }
2990 {
2992 {
2995 }
2999 }
3000 }
3003 }
3005 static void
3007 {
3011 }
3013 static bool
3015 {
3017 }
3019 /* Check that a new jump to a label DECL is OK. Called by
3020 finish_goto_stmt. */
3022 void
3024 {
3027 tree bad;
3030 /* We can't know where a computed goto is jumping.
3031 So we assume that it's OK. */
3035 /* We didn't record any information about this label when we created it,
3036 and there's not much point since it's trivial to analyze as a return. */
3044 /* If the label hasn't been defined yet, defer checking. */
3046 {
3049 /* Don't bother creating another use if the last goto had the
3050 same data, and will therefore create the same set of errors. */
3064 }
3068 {
3073 }
3076 {
3080 {
3081 /* Can't skip init of __exception_info. */
3085 }
3087 {
3090 else
3093 }
3094 }
3097 {
3102 }
3105 {
3108 }
3110 {
3113 {
3117 {
3119 {
3125 }
3129 }
3130 }
3131 }
3132 }
3134 /* Check that a return is ok wrt OpenMP structured blocks.
3135 Called by finish_return_stmt. Returns true if all is well. */
3137 bool
3139 {
3143 {
3146 }
3150 }
3152 /* Define a label, specifying the location in the source file.
3153 Return the LABEL_DECL node for the label. */
3155 static tree
3157 {
3160 tree decl;
3168 /* After labels, make any new cleanups in the function go into their
3169 own new (temporary) binding contour. */
3179 {
3182 }
3183 else
3184 {
3187 /* Mark label as having been defined. */
3189 /* Say where in the source. */
3198 }
3201 }
3203 /* Wrapper for define_label_1. */
3205 tree
3207 {
3208 tree ret;
3213 }
3216 struct cp_switch
3217 {
3220 /* The SWITCH_STMT being built. */
3221 tree switch_stmt;
3222 /* A splay-tree mapping the low element of a case range to the high
3223 element, or NULL_TREE if there is no high element. Used to
3224 determine whether or not a new case label duplicates an old case
3225 label. We need a tree, rather than simply a hash table, because
3226 of the GNU case range extension. */
3227 splay_tree cases;
3228 };
3230 /* A stack of the currently active switch statements. The innermost
3231 switch statement is on the top of the stack. There is no need to
3232 mark the stack for garbage collection because it is only active
3233 during the processing of the body of a function, and we never
3234 collect at that point. */
3238 /* Called right after a switch-statement condition is parsed.
3239 SWITCH_STMT is the switch statement being parsed. */
3241 void
3243 {
3250 }
3252 void
3254 {
3256 location_t switch_location;
3258 /* Emit warnings as needed. */
3268 }
3270 /* Convert a case constant VALUE in a switch to the type TYPE of the switch
3271 condition. Note that if TYPE and VALUE are already integral we don't
3272 really do the conversion because the language-independent
3273 warning/optimization code will work better that way. */
3275 static tree
3277 {
3284 {
3287 value = (perform_implicit_conversion_flags
3290 }
3292 }
3294 /* Note that we've seen a definition of a case label, and complain if this
3295 is a bad place for one. */
3297 tree
3299 {
3302 tree type;
3305 {
3306 tree label;
3308 /* For templates, just add the case label; we'll do semantic
3309 analysis at instantiation-time. */
3312 }
3314 /* Find the condition on which this switch statement depends. */
3330 /* After labels, make any new cleanups in the function go into their
3331 own new (temporary) binding contour. */
3338 }
3339 \f
3341 tree scope;
3342 tree name;
3343 tree template_id;
3346 };
3349 {
3352 /* Hash a TYPENAME_TYPE. */
3354 static hashval_t
3356 {
3357 hashval_t hash;
3363 }
3365 /* Compare two TYPENAME_TYPEs. */
3367 static bool
3369 {
3375 }
3376 };
3378 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3379 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3381 Returns the new TYPENAME_TYPE. */
3385 static tree
3388 {
3389 tree t;
3390 tree d;
3391 typename_info ti;
3393 hashval_t hash;
3408 /* See if we already have this type. */
3412 else
3413 {
3414 /* Build the TYPENAME_TYPE. */
3421 /* Build the corresponding TYPE_DECL. */
3428 /* Store it in the hash table. */
3431 /* TYPENAME_TYPEs must always be compared structurally, because
3432 they may or may not resolve down to another type depending on
3433 the currently open classes. */
3435 }
3438 }
3440 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3441 provided to name the type. Returns an appropriate type, unless an
3442 error occurs, in which case error_mark_node is returned. If we
3443 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3444 return that, rather than the _TYPE it corresponds to, in other
3445 cases we look through the type decl. If TF_ERROR is set, complain
3446 about errors, otherwise be quiet. */
3448 tree
3450 tsubst_flags_t complain)
3451 {
3452 tree fullname;
3453 tree t;
3462 {
3467 else
3468 /* Create a TEMPLATE_ID_EXPR for the type. */
3472 }
3479 {
3484 {
3488 }
3489 }
3491 {
3495 }
3500 {
3504 }
3506 /* When the CONTEXT is a dependent type, NAME could refer to a
3507 dependent base class of CONTEXT. But look inside it anyway
3508 if CONTEXT is a currently open scope, in case it refers to a
3509 member of the current instantiation or a non-dependent base;
3510 lookup will stop when we hit a dependent base. */
3512 /* We should only set WANT_TYPE when we're a nested typename type.
3513 Then we can give better diagnostics if we find a non-type. */
3515 else
3524 {
3529 }
3531 /* Pull out the template from an injected-class-name (or multiple). */
3536 {
3538 {
3541 }
3543 }
3546 {
3551 }
3553 {
3558 }
3563 /* If we are currently parsing a template and if T is a typedef accessed
3564 through CONTEXT then we need to remember and check access of T at
3565 template instantiation time. */
3580 }
3582 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3583 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3584 in which case error_mark_node is returned.
3586 If PARM_LIST is non-NULL, also make sure that the template parameter
3587 list of TEMPLATE_DECL matches.
3589 If COMPLAIN zero, don't complain about any errors that occur. */
3591 tree
3593 tsubst_flags_t complain)
3594 {
3595 tree t;
3596 tree d;
3606 {
3616 {
3620 }
3624 {
3626 {
3630 }
3632 }
3635 complain))
3639 }
3641 /* Build the UNBOUND_CLASS_TEMPLATE. */
3647 /* Build the corresponding TEMPLATE_DECL. */
3656 }
3658 \f
3660 /* Push the declarations of builtin types into the namespace.
3661 RID_INDEX is the index of the builtin type in the array
3662 RID_POINTERS. NAME is the name used when looking up the builtin
3663 type. TYPE is the _TYPE node for the builtin type. */
3665 void
3668 tree type)
3669 {
3678 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3679 eliminated. Built-in types should not be looked up name; their
3680 names are keywords that the parser can recognize. However, there
3681 is code in c-common.c that uses identifier_global_value to look
3682 up built-in types by name. */
3684 {
3688 }
3690 {
3692 {
3695 }
3697 }
3704 }
3706 /* Record one of the standard Java types.
3707 * Declare it as having the given NAME.
3708 * If SIZE > 0, it is the size of one of the integral types;
3709 * otherwise it is the negative of the size of one of the other types. */
3711 static tree
3713 {
3716 {
3719 }
3721 {
3722 tree stype;
3723 /* "__java_char" or ""__java_boolean". */
3726 /* Get the signed type cached and attached to the unsigned type,
3727 so it doesn't get garbage-collected at "random" times,
3728 causing potential codegen differences out of different UIDs
3729 and different alias set numbers. */
3733 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3734 }
3735 else
3740 }
3744 /* Suppress generate debug symbol entries for these types,
3745 since for normal C++ they are just clutter.
3746 However, push_lang_context undoes this if extern "Java" is seen. */
3751 }
3753 /* Push a type into the namespace so that the back ends ignore it. */
3755 static void
3757 {
3760 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3767 }
3769 /* A string for which we should create an IDENTIFIER_NODE at
3770 startup. */
3773 {
3774 /* The name of the identifier. */
3776 /* The place where the IDENTIFIER_NODE should be stored. */
3778 /* Nonzero if this is the name of a constructor or destructor. */
3782 /* Create all the predefined identifiers. */
3784 static void
3786 {
3789 /* A table of identifiers to create at startup. */
3794 /* Some of these names have a trailing space so that it is
3795 impossible for them to conflict with names written by users. */
3813 };
3816 {
3820 }
3821 }
3823 /* Create the predefined scalar types of C,
3824 and some nodes representing standard constants (0, 1, (void *)0).
3825 Initialize the global binding level.
3826 Make definitions for built-in primitive functions. */
3828 void
3830 {
3831 tree void_ftype;
3832 tree void_ftype_ptr;
3834 /* Create all the identifiers we need. */
3837 /* Create the global variables. */
3842 /* Enter the global namespace. */
3845 void_type_node);
3853 /* Initially, C. */
3856 /* Create the `std' namespace. */
3883 #if 0
3885 #endif
3894 void_ftype_ptr
3897 /* C++ extensions */
3902 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3905 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3906 result. */
3913 {
3914 /* Make sure we get a unique function type, so we can give
3915 its pointer type a name. (This wins for gdb.) */
3922 }
3925 vtbl_type_node
3941 /* Now, C++. */
3944 {
3947 tree ptr_ftype_sizetype;
3948 tree new_eh_spec;
3950 ptr_ftype_sizetype
3953 {
3954 tree bad_alloc_id;
3955 tree bad_alloc_type_node;
3956 tree bad_alloc_decl;
3962 bad_alloc_decl
3967 new_eh_spec
3969 }
3970 else
3973 /* Ensure attribs.c is initialized. */
3976 NULL_TREE);
3979 extvisattr);
3993 {
3994 /* Also push the sized deallocation variants:
3995 void operator delete(void*, std::size_t) throw();
3996 void operator delete[](void*, std::size_t) throw(); */
3997 tree void_ftype_ptr_size
4001 extvisattr);
4005 }
4015 }
4017 abort_fndecl
4021 /* Perform other language dependent initializations. */
4035 /* Show we use EH for cleanups. */
4038 }
4040 /* Generate an initializer for a function naming variable from
4041 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
4042 filled in with the type of the init. */
4044 tree
4046 {
4048 tree type;
4053 {
4057 }
4066 else
4070 }
4072 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
4073 the decl, LOC is the location to give the decl, NAME is the
4074 initialization string and TYPE_DEP indicates whether NAME depended
4075 on the type of the function. We make use of that to detect
4076 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
4077 at the point of first use, so we mustn't push the decl now. */
4079 static tree
4081 {
4084 tree type;
4091 /* As we're using pushdecl_with_scope, we must set the context. */
4101 {
4109 LOOKUP_ONLYCONVERTING);
4110 }
4111 else
4112 {
4115 }
4118 }
4120 static tree
4122 {
4131 /* Runtime library routines are, by definition, available in an
4132 external shared object. */
4140 else
4143 /* A function in the user's namespace should have an explicit
4144 declaration before it is used. Mark the built-in function as
4145 anticipated but not actually declared. */
4149 {
4152 /* Treat __*_chk fortification functions as anticipated as well,
4153 unless they are __builtin_*. */
4158 }
4161 }
4163 tree
4165 {
4168 /* All builtins that don't begin with an '_' should additionally
4169 go in the 'std' namespace. */
4171 {
4176 }
4179 }
4181 /* Like cxx_builtin_function, but guarantee the function is added to the global
4182 scope. This is to allow function specific options to add new machine
4183 dependent builtins when the target ISA changes via attribute((target(...)))
4184 which saves space on program startup if the program does not use non-generic
4185 ISAs. */
4187 tree
4189 {
4193 /* All builtins that don't begin with an '_' should additionally
4194 go in the 'std' namespace. */
4196 {
4201 }
4204 }
4206 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
4207 function. Not called directly. */
4209 static tree
4212 {
4219 /* Runtime library routines are, by definition, available in an
4220 external shared object. */
4225 }
4227 /* Returns the _DECL for a library function with C++ linkage. */
4229 static tree
4232 {
4237 }
4239 /* Like build_library_fn, but takes a C string instead of an
4240 IDENTIFIER_NODE. */
4242 tree
4244 {
4246 }
4248 /* Like build_cp_library_fn, but takes a C string instead of an
4249 IDENTIFIER_NODE. */
4251 tree
4253 {
4255 ecf_flags);
4256 }
4258 /* Like build_library_fn, but also pushes the function so that we will
4259 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
4260 may throw exceptions listed in RAISES. */
4262 tree
4264 {
4265 tree fn;
4273 }
4275 /* Like build_cp_library_fn, but also pushes the function so that it
4276 will be found by normal lookup. */
4278 static tree
4281 {
4283 operator_code,
4289 }
4291 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
4292 a FUNCTION_TYPE. */
4294 tree
4296 {
4299 }
4301 /* Like push_library_fn, but also note that this function throws
4302 and does not return. Used for __throw_foo and the like. */
4304 tree
4306 {
4309 }
4310 \f
4311 /* When we call finish_struct for an anonymous union, we create
4312 default copy constructors and such. But, an anonymous union
4313 shouldn't have such things; this function undoes the damage to the
4314 anonymous union type T.
4316 (The reason that we create the synthesized methods is that we don't
4317 distinguish `union { int i; }' from `typedef union { int i; } U'.
4318 The first is an anonymous union; the second is just an ordinary
4319 union type.) */
4321 void
4323 {
4326 /* Wipe out memory of synthesized methods. */
4334 /* Splice the implicitly generated functions out of the TYPE_METHODS
4335 list. */
4338 {
4341 else
4343 }
4345 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
4347 {
4353 else
4356 }
4358 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4359 assignment operators (because they cannot have these methods themselves).
4360 For anonymous unions this is already checked because they are not allowed
4361 in any union, otherwise we have to check it. */
4363 {
4368 {
4371 {
4381 }
4382 }
4383 }
4384 }
4386 /* Warn for an attribute located at LOCATION that appertains to the
4387 class type CLASS_TYPE that has not been properly placed after its
4388 class-key, in it class-specifier. */
4390 void
4392 tree class_type)
4393 {
4397 "attribute ignored in declaration "
4402 }
4404 /* Make sure that a declaration with no declarator is well-formed, i.e.
4405 just declares a tagged type or anonymous union.
4407 Returns the type declared; or NULL_TREE if none. */
4409 tree
4412 {
4415 /* If a class, struct, or enum type is declared by the DECLSPECS
4416 (i.e, if a class-specifier, enum-specifier, or non-typename
4417 elaborated-type-specifier appears in the DECLSPECS),
4418 DECLARED_TYPE is set to the corresponding type. */
4425 {
4431 }
4444 {
4448 }
4449 /* Check for an anonymous union. */
4452 {
4453 /* 7/3 In a simple-declaration, the optional init-declarator-list
4454 can be omitted only when declaring a class (clause 9) or
4455 enumeration (7.2), that is, when the decl-specifier-seq contains
4456 either a class-specifier, an elaborated-type-specifier with
4457 a class-key (9.1), or an enum-specifier. In these cases and
4458 whenever a class-specifier or enum-specifier is present in the
4459 decl-specifier-seq, the identifiers in these specifiers are among
4460 the names being declared by the declaration (as class-name,
4461 enum-names, or enumerators, depending on the syntax). In such
4462 cases, and except for the declaration of an unnamed bit-field (9.6),
4463 the decl-specifier-seq shall introduce one or more names into the
4464 program, or shall redeclare a name introduced by a previous
4465 declaration. [Example:
4466 enum { }; // ill-formed
4467 typedef class { }; // ill-formed
4468 --end example] */
4470 {
4473 }
4480 }
4482 else
4483 {
4490 && (!current_class_type
4508 }
4511 {
4512 location_t loc;
4515 /* For a non-template class, use the name location. */
4517 else
4518 /* For a template class (an explicit instantiation), use the
4519 current location. */
4523 /* [dcl.attr.grammar]/4:
4525 No attribute-specifier-seq shall appertain to an explicit
4526 instantiation. */
4527 {
4530 declared_type))
4532 "no attribute can be applied to "
4534 }
4535 else
4537 }
4540 }
4542 /* Called when a declaration is seen that contains no names to declare.
4543 If its type is a reference to a structure, union or enum inherited
4544 from a containing scope, shadow that tag name for the current scope
4545 with a forward reference.
4546 If its type defines a new named structure or union
4547 or defines an enum, it is valid but we need not do anything here.
4548 Otherwise, it is an error.
4550 C++: may have to grok the declspecs to learn about static,
4551 complain for anonymous unions.
4553 Returns the TYPE declared -- or NULL_TREE if none. */
4555 tree
4557 {
4567 /* This is where the variables in an anonymous union are
4568 declared. An anonymous union declaration looks like:
4569 union { ... } ;
4570 because there is no declarator after the union, the parser
4571 sends that declaration here. */
4573 {
4577 {
4581 }
4582 }
4585 }
4586 \f
4587 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4589 tree
4593 {
4594 tree attrs;
4595 tree type;
4596 enum decl_context context
4602 {
4607 /* A template type parameter or other dependent type. */
4610 else
4612 }
4614 }
4616 /* Process a DECLARATOR for a function-scope variable declaration,
4617 namespace-scope variable declaration, or function declaration.
4618 (Function definitions go through start_function; class member
4619 declarations appearing in the body of the class go through
4620 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4621 If an error occurs, the error_mark_node is returned instead.
4623 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4624 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4625 for an explicitly defaulted function, or SD_DELETED for an explicitly
4626 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4627 implicitly initialized via a default constructor. ATTRIBUTES and
4628 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4630 The scope represented by the context of the returned DECL is pushed
4631 (if it is not the global namespace) and is assigned to
4632 *PUSHED_SCOPE_P. The caller is then responsible for calling
4633 pop_scope on *PUSHED_SCOPE_P if it is set. */
4635 tree
4639 tree attributes,
4640 tree prefix_attributes,
4642 {
4643 tree decl;
4644 tree context;
4651 /* An object declared as __attribute__((deprecated)) suppresses
4652 warnings of uses of other deprecated items. */
4671 /* Is it valid for this decl to have an initializer at all?
4672 If not, set INITIALIZED to zero, which will indirectly
4673 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4676 {
4679 }
4682 {
4686 decl);
4690 }
4696 /* If this is a typedef that names the class for linkage purposes
4697 (7.1.3p8), apply any attributes directly to the type. */
4702 else
4705 /* Set attributes here so if duplicate decl, will have proper attributes. */
4708 /* Dllimported symbols cannot be defined. Static data members (which
4709 can be initialized in-class and dllimported) go through grokfield,
4710 not here, so we don't need to exclude those decls when checking for
4711 a definition. */
4713 {
4716 }
4718 /* If #pragma weak was used, mark the decl weak now. */
4729 {
4733 {
4739 {
4743 else
4744 {
4750 }
4751 }
4752 else
4753 {
4758 {
4765 }
4766 /* Static data member are tricky; an in-class initialization
4767 still doesn't provide a definition, so the in-class
4768 declaration will have DECL_EXTERNAL set, but will have an
4769 initialization. Thus, duplicate_decls won't warn
4770 about this situation, and so we check here. */
4778 }
4779 }
4780 else
4781 {
4783 this_tmpl
4784 ? current_template_parms
4790 }
4792 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4794 /* Do not mark DECL as an explicit specialization if it was not
4795 already marked as an instantiation; a declaration should
4796 never be marked as a specialization unless we know what
4797 template is being specialized. */
4799 {
4804 else
4807 /* [temp.expl.spec] An explicit specialization of a static data
4808 member of a template is a definition if the declaration
4809 includes an initializer; otherwise, it is a declaration.
4811 We check for processing_specialization so this only applies
4812 to the new specialization syntax. */
4815 }
4818 /* Aliases are definitions. */
4821 decl);
4822 }
4826 /* Enter this declaration into the symbol table. */
4837 {
4838 /* This is a const variable with implicit 'static'. Set
4839 DECL_THIS_STATIC so we can tell it from variables that are
4840 !TREE_PUBLIC because of the anonymous namespace. */
4843 }
4847 {
4851 decl);
4854 else
4858 }
4864 }
4866 /* Process the declaration of a variable DECL. INITIALIZED is true
4867 iff DECL is explicitly initialized. (INITIALIZED is false if the
4868 variable is initialized via an implicitly-called constructor.)
4869 This function must be called for ordinary variables (including, for
4870 example, implicit instantiations of templates), but must not be
4871 called for template declarations. */
4873 void
4875 {
4876 tree type;
4891 /* If an explicit initializer is present, or if this is a definition
4892 of an aggregate, then we need a complete type at this point.
4893 (Scalars are always complete types, so there is nothing to
4894 check.) This code just sets COMPLETE_P; errors (if necessary)
4895 are issued below. */
4897 && !complete_p
4899 {
4901 /* We will not yet have set TREE_READONLY on DECL if the type
4902 was "const", but incomplete, before this point. But, now, we
4903 have a complete type, so we can try again. */
4905 }
4908 /* Is it valid for this decl to have an initializer at all? */
4909 {
4910 /* Don't allow initializations for incomplete types except for
4911 arrays which might be completed by the initialization. */
4917 {
4920 }
4922 {
4925 /* else we already gave an error in start_decl. */
4926 }
4927 }
4929 {
4932 else
4934 decl);
4935 /* Change the type so that assemble_variable will give
4936 DECL an rtl we can live with: (mem (const_int 0)). */
4938 }
4940 /* Create a new scope to hold this declaration if necessary.
4941 Whether or not a new scope is necessary cannot be determined
4942 until after the type has been completed; if the type is a
4943 specialization of a class template it is not until after
4944 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4945 will be set correctly. */
4947 }
4949 /* Handle initialization of references. DECL, TYPE, and INIT have the
4950 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4951 but will be set to a new CLEANUP_STMT if a temporary is created
4952 that must be destroyed subsequently.
4954 Returns an initializer expression to use to initialize DECL, or
4955 NULL if the initialization can be performed statically.
4957 Quotes on semantics can be found in ARM 8.4.3. */
4959 static tree
4961 {
4963 {
4969 }
4973 tf_warning_or_error);
4978 /* Note: default conversion is only called in very special cases. */
4981 /* check_initializer handles this for non-reference variables, but for
4982 references we need to do it here or the initializer will get the
4983 incomplete array type and confuse later calls to
4984 cp_complete_array_type. */
4989 {
4993 }
4995 /* Convert INIT to the reference type TYPE. This may involve the
4996 creation of a temporary, whose lifetime must be the same as that
4997 of the reference. If so, a DECL_EXPR for the temporary will be
4998 added just after the DECL_EXPR for DECL. That's why we don't set
4999 DECL_INITIAL for local references (instead assigning to them
5000 explicitly); we need to allow the temporary to be initialized
5001 first. */
5003 tf_warning_or_error);
5004 }
5006 /* Designated initializers in arrays are not supported in GNU C++.
5007 The parser cannot detect this error since it does not know whether
5008 a given brace-enclosed initializer is for a class type or for an
5009 array. This function checks that CE does not use a designated
5010 initializer. If it does, an error is issued. Returns true if CE
5011 is valid, i.e., does not have a designated initializer. */
5013 static bool
5016 {
5017 /* Designated initializers for array elements are not supported. */
5019 {
5020 /* The parser only allows identifiers as designated
5021 initializers. */
5023 {
5027 }
5029 {
5033 }
5041 {
5042 /* A C99 designator is OK if it matches the current index. */
5045 else
5047 }
5048 else
5053 }
5056 }
5058 /* When parsing `int a[] = {1, 2};' we don't know the size of the
5059 array until we finish parsing the initializer. If that's the
5060 situation we're in, update DECL accordingly. */
5062 static void
5064 {
5070 {
5071 /* do_default is really a C-ism to deal with tentative definitions.
5072 But let's leave it here to ease the eventual merge. */
5077 /* Check that there are no designated initializers in INIT, as
5078 those are not supported in GNU C++, and as the middle-end
5079 will crash if presented with a non-numeric designated
5080 initializer. */
5082 {
5085 HOST_WIDE_INT i;
5089 }
5092 {
5094 do_default);
5096 {
5098 }
5100 {
5102 {
5104 }
5105 /* If a `static' var's size isn't known, make it extern as
5106 well as static, so it does not get allocated. If it's not
5107 `static', then don't mark it extern; finish_incomplete_decl
5108 will give it a default size and it will get allocated. */
5111 }
5113 {
5115 }
5116 }
5121 }
5122 }
5124 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
5125 any appropriate error messages regarding the layout. */
5127 static void
5129 {
5130 tree type;
5136 /* If we haven't already laid out this declaration, do so now.
5137 Note that we must not call complete type for an external object
5138 because it's type might involve templates that we are not
5139 supposed to instantiate yet. (And it's perfectly valid to say
5140 `extern X x' for some incomplete type `X'.) */
5152 {
5153 /* An automatic variable with an incomplete type: that is an error.
5154 Don't talk about array types here, since we took care of that
5155 message in grokdeclarator. */
5158 }
5159 #if 0
5160 /* Keep this code around in case we later want to control debug info
5161 based on whether a type is "used". (jason 1999-11-11) */
5164 /* Let debugger know it should output info for this type. */
5169 #endif
5174 {
5177 else
5178 {
5181 }
5182 }
5183 }
5185 /* If a local static variable is declared in an inline function, or if
5186 we have a weak definition, we must endeavor to create only one
5187 instance of the variable at link-time. */
5189 void
5191 {
5192 /* Static data in a function with comdat linkage also has comdat
5193 linkage. */
5195 /* Don't mess with __FUNCTION__. */
5199 {
5201 {
5202 /* With weak symbols, we simply make the variable COMDAT;
5203 that will cause copies in multiple translations units to
5204 be merged. */
5206 }
5207 else
5208 {
5211 {
5212 /* Without weak symbols, we can use COMMON to merge
5213 uninitialized variables. */
5216 }
5217 else
5218 {
5219 /* While for initialized variables, we must use internal
5220 linkage -- which means that multiple copies will not
5221 be merged. */
5225 "sorry: semantics of inline function static "
5226 "data %q#D are wrong (you%'ll wind up "
5230 }
5231 }
5232 }
5233 }
5235 /* Issue an error message if DECL is an uninitialized const variable. */
5237 static void
5239 {
5242 /* ``Unless explicitly declared extern, a const object does not have
5243 external linkage and must be initialized. ($8.4; $12.1)'' ARM
5244 7.1.6 */
5249 {
5257 else
5258 {
5261 decl);
5263 }
5266 {
5267 tree defaulted_ctor;
5274 "constructor is not user-provided because it is "
5278 }
5279 }
5280 }
5281 \f
5282 /* Structure holding the current initializer being processed by reshape_init.
5283 CUR is a pointer to the current element being processed, END is a pointer
5284 after the last element present in the initializer. */
5286 {
5293 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
5294 returned is the next FIELD_DECL (possibly FIELD itself) that can be
5295 initialized. If there are no more such fields, the return value
5296 will be NULL. */
5298 tree
5300 {
5308 }
5310 /* Subroutine of reshape_init_array and reshape_init_vector, which does
5311 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
5312 INTEGER_CST representing the size of the array minus one (the maximum index),
5313 or NULL_TREE if the array was declared without specifying the size. D is
5314 the iterator within the constructor. */
5316 static tree
5318 tsubst_flags_t complain)
5319 {
5320 tree new_init;
5325 /* The initializer for an array is always a CONSTRUCTOR. */
5329 {
5330 /* Minus 1 is used for zero sized arrays. */
5336 /* sizetype is sign extended, not zero extended. */
5337 else
5339 }
5341 /* Loop until there are no more initializers. */
5345 {
5346 tree elt_init;
5351 complain);
5359 /* This can happen with an invalid initializer (c++/54501). */
5362 }
5365 }
5367 /* Subroutine of reshape_init_r, processes the initializers for arrays.
5368 Parameters are the same of reshape_init_r. */
5370 static tree
5372 {
5381 }
5383 /* Subroutine of reshape_init_r, processes the initializers for vectors.
5384 Parameters are the same of reshape_init_r. */
5386 static tree
5388 {
5394 {
5397 {
5402 }
5405 }
5407 /* For a vector, we initialize it as an array of the appropriate size. */
5412 }
5414 /* Subroutine of reshape_init_r, processes the initializers for classes
5415 or union. Parameters are the same of reshape_init_r. */
5417 static tree
5419 tsubst_flags_t complain)
5420 {
5421 tree field;
5422 tree new_init;
5426 /* The initializer for a class is always a CONSTRUCTOR. */
5431 {
5432 /* [dcl.init.aggr]
5434 An initializer for an aggregate member that is an
5435 empty class shall have the form of an empty
5436 initializer-list {}. */
5438 {
5442 }
5444 }
5446 /* Loop through the initializable fields, gathering initializers. */
5448 {
5449 tree field_init;
5452 /* Handle designated initializers, as an extension. */
5454 {
5459 /* We already reshaped this. */
5463 else
5464 {
5469 }
5472 {
5477 }
5478 }
5480 /* If we processed all the member of the class, we are done. */
5490 {
5491 /* This can happen with an invalid initializer for a flexible
5492 array member (c++/54441). */
5496 }
5500 /* [dcl.init.aggr]
5502 When a union is initialized with a brace-enclosed
5503 initializer, the braces shall only contain an
5504 initializer for the first member of the union. */
5509 }
5512 }
5514 /* Subroutine of reshape_init_r. We're in a context where C99 initializer
5515 designators are not valid; either complain or return true to indicate
5516 that reshape_init_r should return error_mark_node. */
5518 static bool
5520 {
5522 {
5526 else
5528 }
5530 }
5532 /* Subroutine of reshape_init, which processes a single initializer (part of
5533 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5534 iterator within the CONSTRUCTOR which points to the initializer to process.
5535 FIRST_INITIALIZER_P is true if this is the first initializer of the
5536 outermost CONSTRUCTOR node. */
5538 static tree
5540 tsubst_flags_t complain)
5541 {
5552 {
5553 /* A complex type can be initialized from one or two initializers,
5554 but braces are not elided. */
5557 {
5559 {
5562 else
5564 }
5565 }
5567 {
5575 }
5577 }
5579 /* A non-aggregate type is always initialized with a single
5580 initializer. */
5582 {
5583 /* It is invalid to initialize a non-aggregate type with a
5584 brace-enclosed initializer before C++0x.
5585 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
5586 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
5587 a CONSTRUCTOR (with a record type). */
5589 /* Don't complain about a capture-init. */
5592 {
5594 {
5596 /* Isn't value-initialization. */
5598 {
5601 type);
5603 }
5604 }
5605 else
5607 }
5611 }
5613 /* "If T is a class type and the initializer list has a single element of
5614 type cv U, where U is T or a class derived from T, the object is
5615 initialized from that element." Even if T is an aggregate. */
5617 && first_initializer_p
5620 {
5623 }
5625 /* [dcl.init.aggr]
5627 All implicit type conversions (clause _conv_) are considered when
5628 initializing the aggregate member with an initializer from an
5629 initializer-list. If the initializer can initialize a member,
5630 the member is initialized. Otherwise, if the member is itself a
5631 non-empty subaggregate, brace elision is assumed and the
5632 initializer is considered for the initialization of the first
5633 member of the subaggregate. */
5635 /* But don't try this for the first initializer, since that would be
5636 looking through the outermost braces; A a2 = { a1 }; is not a
5637 valid aggregate initialization. */
5638 && !first_initializer_p
5641 complain)))
5642 {
5645 }
5647 /* [dcl.init.string]
5649 A char array (whether plain char, signed char, or unsigned char)
5650 can be initialized by a string-literal (optionally enclosed in
5651 braces); a wchar_t array can be initialized by a wide
5652 string-literal (optionally enclosed in braces). */
5655 {
5658 /* Strip one level of braces if and only if they enclose a single
5659 element (as allowed by [dcl.init.string]). */
5663 {
5665 }
5667 /* If it's a string literal, then it's the initializer for the array
5668 as a whole. Otherwise, continue with normal initialization for
5669 array types (one value per array element). */
5671 {
5676 }
5677 }
5679 /* The following cases are about aggregates. If we are not within a full
5680 initializer already, and there is not a CONSTRUCTOR, it means that there
5681 is a missing set of braces (that is, we are processing the case for
5682 which reshape_init exists). */
5684 {
5686 {
5688 /* There is no need to reshape pointer-to-member function
5689 initializers, as they are always constructed correctly
5690 by the front end. */
5691 ;
5693 /* For a nested compound literal, there is no need to reshape since
5694 brace elision is not allowed. Even if we decided to allow it,
5695 we should add a call to reshape_init in finish_compound_literal,
5696 before calling digest_init, so changing this code would still
5697 not be necessary. */
5699 else
5700 {
5704 }
5705 }
5708 type);
5709 }
5711 /* Dispatch to specialized routines. */
5718 else
5720 }
5722 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
5723 brace-enclosed aggregate initializer.
5725 INIT is the CONSTRUCTOR containing the list of initializers describing
5726 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
5727 It may not presently match the shape of the TYPE; for example:
5729 struct S { int a; int b; };
5730 struct S a[] = { 1, 2, 3, 4 };
5732 Here INIT will hold a vector of four elements, rather than a
5733 vector of two elements, each itself a vector of two elements. This
5734 routine transforms INIT from the former form into the latter. The
5735 revised CONSTRUCTOR node is returned. */
5737 tree
5739 {
5741 reshape_iter d;
5742 tree new_init;
5748 /* An empty constructor does not need reshaping, and it is always a valid
5749 initializer. */
5753 /* Recurse on this CONSTRUCTOR. */
5761 /* Make sure all the element of the constructor were used. Otherwise,
5762 issue an error about exceeding initializers. */
5764 {
5767 else
5769 }
5772 }
5774 /* Verify array initializer. Returns true if errors have been reported. */
5776 bool
5778 {
5781 /* The array type itself need not be complete, because the
5782 initializer may tell us how many elements are in the array.
5783 But, the elements of the array must be complete. */
5785 {
5788 else
5791 }
5792 /* A compound literal can't have variable size. */
5796 {
5799 }
5801 }
5803 /* Subroutine of check_initializer; args are passed down from that function.
5804 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5806 static tree
5809 {
5812 }
5814 /* Verify INIT (the initializer for DECL), and record the
5815 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5816 grok_reference_init.
5818 If the return value is non-NULL, it is an expression that must be
5819 evaluated dynamically to initialize DECL. */
5821 static tree
5823 {
5826 tree core_type;
5828 /* Things that are going to be initialized need to have complete
5829 type. */
5833 {
5834 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
5835 it doesn't have storage to be initialized. */
5838 }
5841 /* We will have already complained. */
5845 {
5848 }
5850 {
5854 }
5855 else
5856 /* There is no way to make a variable-sized class type in GNU C++. */
5860 {
5863 {
5865 {
5868 }
5870 {
5872 decl);
5875 }
5876 }
5877 }
5880 {
5887 }
5889 ;
5892 {
5894 {
5897 }
5900 /* Do not reshape constructors of vectors (they don't need to be
5901 reshaped. */
5903 {
5905 {
5907 tf_warning_or_error);
5909 }
5911 {
5912 /* Don't reshape if the class has constructors. */
5916 decl);
5917 }
5919 {
5922 }
5923 else
5924 {
5927 }
5928 }
5932 {
5935 /* We get here with code like `int a (2);' */
5937 tf_warning_or_error);
5938 }
5940 /* If DECL has an array type without a specific bound, deduce the
5941 array size from the initializer. */
5954 {
5957 /* A constructor call is a non-trivial initializer even if
5958 it isn't explicitly written. */
5962 /* If this is a constexpr initializer, expand_default_init will
5963 have returned an INIT_EXPR rather than a CALL_EXPR. In that
5964 case, pull the initializer back out and pass it down into
5965 store_init_value. */
5970 {
5973 /* Don't call digest_init; it's unnecessary and will complain
5974 about aggregate initialization of non-aggregate classes. */
5976 }
5978 {
5979 /* Declared constexpr, but no suitable initializer; massage
5980 init appropriately so we can pass it into store_init_value
5981 for the error. */
5984 {
5988 }
5990 }
5991 else
5993 }
5996 {
5997 /* In aggregate initialization of a variable, each element
5998 initialization is a full-expression because there is no
5999 enclosing expression. */
6011 }
6012 }
6013 else
6014 {
6022 }
6028 {
6029 /* We might have set these in cp_finish_decl. */
6032 }
6035 {
6040 else
6044 {
6048 }
6050 }
6053 }
6055 /* If DECL is not a local variable, give it RTL. */
6057 static void
6059 {
6064 /* Set the DECL_ASSEMBLER_NAME for the object. */
6066 {
6067 /* The `register' keyword, when used together with an
6068 asm-specification, indicates that the variable should be
6069 placed in a particular register. */
6071 {
6074 }
6075 else
6076 {
6081 }
6082 }
6084 /* Handle non-variables up front. */
6086 {
6089 }
6091 /* If we see a class member here, it should be a static data
6092 member. */
6094 {
6096 /* An in-class declaration of a static data member should be
6097 external; it is only a declaration, and not a definition. */
6100 }
6102 /* We don't create any RTL for local variables. */
6106 /* We defer emission of local statics until the corresponding
6107 DECL_EXPR is expanded. */
6110 /* We try to defer namespace-scope static constants so that they are
6111 not emitted into the object file unnecessarily. */
6119 && toplev
6121 {
6122 /* Fool with the linkage of static consts according to #pragma
6123 interface. */
6126 {
6129 }
6132 }
6133 /* Likewise for template instantiations. */
6138 /* If we're not deferring, go ahead and assemble the variable. */
6141 }
6143 /* walk_tree helper for wrap_temporary_cleanups, below. */
6145 static tree
6147 {
6148 /* Stop at types or full-expression boundaries. */
6151 {
6154 }
6157 {
6162 /* Tell honor_protect_cleanup_actions to handle this as a separate
6163 cleanup. */
6167 }
6170 }
6172 /* We're initializing a local variable which has a cleanup GUARD. If there
6173 are any temporaries used in the initializer INIT of this variable, we
6174 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
6175 variable will be cleaned up properly if one of them throws.
6177 Unfortunately, there's no way to express this properly in terms of
6178 nesting, as the regions for the temporaries overlap the region for the
6179 variable itself; if there are two temporaries, the variable needs to be
6180 the first thing destroyed if either of them throws. However, we only
6181 want to run the variable's cleanup if it actually got constructed. So
6182 we need to guard the temporary cleanups with the variable's cleanup if
6183 they are run on the normal path, but not if they are run on the
6184 exceptional path. We implement this by telling
6185 honor_protect_cleanup_actions to strip the variable cleanup from the
6186 exceptional path. */
6188 static void
6190 {
6192 }
6194 /* Generate code to initialize DECL (a local variable). */
6196 static void
6198 {
6200 tree cleanup;
6208 {
6209 /* If we used it already as memory, it must stay in memory. */
6213 }
6218 /* Compute and store the initial value. */
6223 /* Generate a cleanup, if necessary. */
6226 /* Perform the initialization. */
6228 {
6232 {
6233 /* Stick simple initializers in DECL_INITIAL so that
6234 -Wno-init-self works (c++/34772). */
6239 {
6243 OPT_Winit_self,
6245 }
6246 }
6247 else
6248 {
6251 /* If we're only initializing a single object, guard the
6252 destructors of any temporaries used in its initializer with
6253 its destructor. This isn't right for arrays because each
6254 element initialization is a full-expression. */
6263 saved_stmts_are_full_exprs_p;
6264 }
6265 }
6267 /* Set this to 0 so we can tell whether an aggregate which was
6268 initialized was ever used. Don't do this if it has a
6269 destructor, so we don't complain about the 'resource
6270 allocation is initialization' idiom. Now set
6271 attribute((unused)) on types so decls of that type will be
6272 marked used. (see TREE_USED, above.) */
6274 && ! already_used
6283 }
6285 /* DECL is a VAR_DECL for a compiler-generated variable with static
6286 storage duration (like a virtual table) whose initializer is a
6287 compile-time constant. Initialize the variable and provide it to the
6288 back end. */
6290 void
6292 {
6293 tree init;
6303 }
6305 /* INIT is the initializer for a variable, as represented by the
6306 parser. Returns true iff INIT is type-dependent. */
6308 static bool
6310 {
6312 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
6315 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
6316 {
6326 }
6327 else
6328 /* It must be a simple expression, e.g., int i = 3; */
6332 }
6334 /* INIT is the initializer for a variable, as represented by the
6335 parser. Returns true iff INIT is value-dependent. */
6337 static bool
6339 {
6341 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
6344 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
6345 {
6355 }
6356 else
6357 /* It must be a simple expression, e.g., int i = 3; */
6361 }
6363 /* Finish processing of a declaration;
6364 install its line number and initial value.
6365 If the length of an array type is not known before,
6366 it must be determined now, from the initial value, or it is an error.
6368 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
6369 true, then INIT is an integral constant expression.
6371 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
6372 if the (init) syntax was used. */
6374 void
6377 {
6378 tree type;
6383 tree auto_node;
6388 {
6392 }
6395 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
6402 /* If a name was specified, get the string. */
6417 {
6418 tree d_init;
6420 {
6424 {
6425 /* init is null because we're deferring instantiating the
6426 initializer until we need it. Well, we need it now. */
6429 }
6434 }
6438 tf_warning_or_error);
6441 auto_node);
6445 }
6456 {
6457 tree clone;
6459 {
6460 /* FIXME check this is 1st decl. */
6465 {
6469 }
6471 }
6473 {
6476 else
6478 }
6479 }
6482 {
6484 /* If DECL is a reference, then we want to know whether init is a
6485 reference constant; init_const_expr_p as passed tells us whether
6486 it's an rvalue constant. */
6490 {
6491 /* Set these flags now for templates. We'll update the flags in
6492 store_init_value for instantiations. */
6496 }
6497 }
6500 {
6503 /* Add this declaration to the statement-tree. */
6510 {
6513 }
6515 /* Generally, initializers in templates are expanded when the
6516 template is instantiated. But, if DECL is a variable constant
6517 then it can be used in future constant expressions, so its value
6518 must be available. */
6523 && init_const_expr_p
6524 && !type_dependent_p
6529 {
6530 /* This variable seems to be a non-dependent constant, so process
6531 its initializer. If check_initializer returns non-null the
6532 initialization wasn't constant after all. */
6533 tree init_code;
6539 }
6541 {
6542 /* Deduce array size even if the initializer is dependent. */
6544 /* And complain about multiple initializers. */
6548 tf_warning_or_error);
6549 }
6554 }
6556 /* Just store non-static data member initializers for later. */
6560 /* Take care of TYPE_DECLs up front. */
6562 {
6565 {
6569 }
6571 /* If we have installed this as the canonical typedef for this
6572 type, and that type has not been defined yet, delay emitting
6573 the debug information for it, as we will emit it later. */
6579 at_eof);
6581 }
6583 /* A reference will be modified here, as it is initialized. */
6587 {
6590 }
6593 {
6594 /* If this is a local variable that will need a mangled name,
6595 register it now. We must do this before processing the
6596 initializer for the variable, since the initialization might
6597 require a guard variable, and since the mangled name of the
6598 guard variable will depend on the mangled name of this
6599 variable. */
6603 {
6607 /* Normally local_decls is populated during GIMPLE lowering,
6608 but [cd]tors are never actually compiled directly. We need
6609 to put statics on the list so we can deal with the label
6610 address extension. FIXME. */
6612 }
6614 /* Convert the initializer to the type of DECL, if we have not
6615 already initialized DECL. */
6617 /* If !DECL_EXTERNAL then DECL is being defined. In the
6618 case of a static data member initialized inside the
6619 class-specifier, there can be an initializer even if DECL
6620 is *not* defined. */
6622 {
6624 {
6625 tree jclass
6627 /* Allow libjava/prims.cc define primitive classes. */
6632 || !same_type_ignoring_top_level_qualifiers_p
6636 }
6640 /* Handle:
6642 [dcl.init]
6644 The memory occupied by any object of static storage
6645 duration is zero-initialized at program startup before
6646 any other initialization takes place.
6648 We cannot create an appropriate initializer until after
6649 the type of DECL is finalized. If DECL_INITIAL is set,
6650 then the DECL is statically initialized, and any
6651 necessary zero-initialization has already been performed. */
6656 /* Remember that the initialization for this variable has
6657 taken place. */
6659 /* This declaration is the definition of this variable,
6660 unless we are initializing a static data member within
6661 the class specifier. */
6664 }
6665 /* If the variable has an array type, lay out the type, even if
6666 there is no initializer. It is valid to index through the
6667 array, and we must get TYPE_ALIGN set correctly on the array
6668 type. */
6675 /* So decl is a global variable or a static member of a
6676 non local class. Record the types it uses
6677 so that we can decide later to emit debug info for them. */
6679 }
6684 /* Add this declaration to the statement-tree. This needs to happen
6685 after the call to check_initializer so that the DECL_EXPR for a
6686 reference temp is added before the DECL_EXPR for the reference itself. */
6688 {
6689 /* If we're building a variable sized type, and we might be
6690 reachable other than via the top of the current binding
6691 level, then create a new BIND_EXPR so that we deallocate
6692 the object at the right time. */
6697 {
6698 tree bind;
6703 }
6705 }
6707 /* Let the middle end know about variables and functions -- but not
6708 static data members in uninstantiated class templates. */
6710 {
6712 {
6715 }
6717 /* This needs to happen after the linkage is set. */
6721 {
6722 /* If a TREE_READONLY variable needs initialization
6723 at runtime, it is no longer readonly and we need to
6724 avoid MEM_READONLY_P being set on RTL created for it. */
6726 {
6730 }
6734 /* Likewise if it needs destruction. */
6737 }
6741 /* Check for abstractness of the type. Notice that there is no
6742 need to strip array types here since the check for those types
6743 is already done within create_array_type_for_decl. */
6747 /* No initialization required. */
6748 ;
6750 {
6752 {
6754 {
6755 /* An out-of-class default definition is defined at
6756 the point where it is explicitly defaulted. */
6761 }
6762 else
6764 }
6765 /* else no initialization required. */
6766 }
6770 {
6773 }
6774 /* A variable definition. */
6776 /* Initialize the local variable. */
6779 /* If a variable is defined, and then a subsequent
6780 definition with external linkage is encountered, we will
6781 get here twice for the same variable. We want to avoid
6782 calling expand_static_init more than once. For variables
6783 that are not static data members, we can call
6784 expand_static_init only when we actually process the
6785 initializer. It is not legal to redeclare a static data
6786 member, so this issue does not arise in that case. */
6789 }
6791 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
6792 reference, insert it in the statement-tree now. */
6794 {
6799 }
6805 }
6807 /* Returns a declaration for a VAR_DECL as if:
6809 extern "C" TYPE NAME;
6811 had been seen. Used to create compiler-generated global
6812 variables. */
6814 static tree
6816 {
6817 tree decl;
6824 /* If the user has explicitly declared this variable (perhaps
6825 because the code we are compiling is part of a low-level runtime
6826 library), then it is possible that our declaration will be merged
6827 with theirs by pushdecl. */
6833 }
6835 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
6836 if "__cxa_atexit" is not being used) corresponding to the function
6837 to be called when the program exits. */
6839 static tree
6841 {
6842 tree fn_type;
6845 {
6846 tree arg_type;
6849 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
6851 else
6852 /* The parameter to "atexit" is "void (*)(void)". */
6858 }
6861 }
6863 /* Returns a pointer to the `atexit' function. Note that if
6864 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
6865 `__cxa_atexit' function specified in the IA64 C++ ABI. */
6867 static tree
6869 {
6870 tree atexit_fndecl;
6871 tree fn_type;
6872 tree fn_ptr_type;
6880 {
6881 /* The declaration for `__cxa_atexit' is:
6883 int __cxa_atexit (void (*)(void *), void *, void *)
6885 We build up the argument types and then the function type
6886 itself. */
6890 /* First, build the pointer-to-function type for the first
6891 argument. */
6893 /* Then, build the rest of the argument types. */
6896 {
6899 }
6900 else
6901 {
6904 }
6905 /* And the final __cxa_atexit type. */
6908 NULL_TREE);
6911 else
6913 }
6914 else
6915 {
6916 /* The declaration for `atexit' is:
6918 int atexit (void (*)());
6920 We build up the argument types and then the function type
6921 itself. */
6923 /* Build the final atexit type. */
6927 }
6929 /* Now, build the function declaration. */
6937 }
6939 /* Like get_atexit_node, but for thread-local cleanups. */
6941 static tree
6943 {
6944 /* The declaration for `__cxa_thread_atexit' is:
6946 int __cxa_thread_atexit (void (*)(void *), void *, void *) */
6950 NULL_TREE);
6952 /* Now, build the function declaration. */
6956 }
6958 /* Returns the __dso_handle VAR_DECL. */
6960 static tree
6962 {
6966 /* Declare the variable. */
6968 ptr_type_node);
6970 #ifdef HAVE_GAS_HIDDEN
6972 {
6975 }
6976 #endif
6979 }
6981 /* Begin a new function with internal linkage whose job will be simply
6982 to destroy some particular variable. */
6986 static tree
6988 {
6990 tree fntype;
6991 tree fndecl;
6997 /* No need to mangle this. */
7000 /* Build the name of the function. */
7002 /* Build the function declaration. */
7005 /* It's a function with internal linkage, generated by the
7006 compiler. */
7009 /* Make the function `inline' so that it is only emitted if it is
7010 actually needed. It is unlikely that it will be inlined, since
7011 it is only called via a function pointer, but we avoid unnecessary
7012 emissions this way. */
7015 /* Build the parameter. */
7017 {
7018 tree parmdecl;
7025 }
7033 }
7035 /* Finish the cleanup function begun by start_cleanup_fn. */
7037 static void
7039 {
7043 }
7045 /* Generate code to handle the destruction of DECL, an object with
7046 static storage duration. */
7048 tree
7050 {
7051 tree cleanup;
7052 tree addr;
7053 tree compound_stmt;
7054 tree fcall;
7055 tree type;
7058 tree atex_node;
7064 /* If we're using "__cxa_atexit" (or "__cxa_thread_atexit" or
7065 "__aeabi_atexit"), and DECL is a class object, we can just pass the
7066 destructor to "__cxa_atexit"; we don't have to build a temporary
7067 function to do the cleanup. */
7068 dso_parm = (flag_use_cxa_atexit
7073 {
7076 /* Find the destructor. */
7080 /* Make sure it is accessible. */
7082 tf_warning_or_error);
7083 }
7084 else
7085 {
7086 /* Call build_cleanup before we enter the anonymous function so
7087 that any access checks will be done relative to the current
7088 scope, rather than the scope of the anonymous function. */
7091 /* Now start the function. */
7094 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
7095 to the original function, rather than the anonymous one. That
7096 will make the back end think that nested functions are in use,
7097 which causes confusion. */
7102 /* Create the body of the anonymous function. */
7107 }
7109 /* Call atexit with the cleanup function. */
7115 else
7119 {
7120 /* We must convert CLEANUP to the type that "__cxa_atexit"
7121 expects. */
7123 /* "__cxa_atexit" will pass the address of DECL to the
7124 cleanup function. */
7127 /* The declared type of the parameter to "__cxa_atexit" is
7128 "void *". For plain "T*", we could just let the
7129 machinery in cp_build_function_call convert it -- but if the
7130 type is "cv-qualified T *", then we need to convert it
7131 before passing it in, to avoid spurious errors. */
7133 }
7134 else
7135 /* Since the cleanup functions we build ignore the address
7136 they're given, there's no reason to pass the actual address
7137 in, and, in general, it's cheaper to pass NULL than any
7138 other value. */
7143 tf_warning_or_error);
7145 /* Just pass NULL to the dso handle parm if we don't actually
7146 have a DSO handle on this target. */
7148 else
7152 {
7155 {
7158 }
7159 else
7160 {
7163 }
7164 }
7165 else
7166 {
7169 }
7172 }
7174 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
7175 is its initializer. Generate code to handle the construction
7176 and destruction of DECL. */
7178 static void
7180 {
7184 /* Some variables require no dynamic initialization. */
7187 {
7188 /* Make sure the destructor is callable. */
7191 }
7195 {
7199 else
7204 {
7206 "C++11 %<thread_local%> allows dynamic initialization "
7209 }
7211 }
7214 {
7215 /* Emit code to perform this initialization but once. */
7220 /* We don't need thread-safety code for thread-local vars. */
7224 /* Emit code to perform this initialization but once. This code
7225 looks like:
7227 static <type> guard;
7228 if (!guard.first_byte) {
7229 if (__cxa_guard_acquire (&guard)) {
7230 bool flag = false;
7231 try {
7232 // Do initialization.
7233 flag = true; __cxa_guard_release (&guard);
7234 // Register variable for destruction at end of program.
7235 } catch {
7236 if (!flag) __cxa_guard_abort (&guard);
7237 }
7238 }
7240 Note that the `flag' variable is only set to 1 *after* the
7241 initialization is complete. This ensures that an exception,
7242 thrown during the construction, will cause the variable to
7243 reinitialized when we pass through this code again, as per:
7245 [stmt.dcl]
7247 If the initialization exits by throwing an exception, the
7248 initialization is not complete, so it will be tried again
7249 the next time control enters the declaration.
7251 This process should be thread-safe, too; multiple threads
7252 should not be able to initialize the variable more than
7253 once. */
7255 /* Create the guard variable. */
7258 /* This optimization isn't safe on targets with relaxed memory
7259 consistency. On such targets we force synchronization in
7260 __cxa_guard_acquire. */
7262 {
7263 /* Begin the conditional initialization. */
7267 }
7270 {
7283 acquire_fn = push_library_fn
7286 NULL_TREE),
7291 NULL_TREE);
7301 inner_if_stmt);
7309 void_node,
7313 /* Do the initialization itself. */
7315 init = add_stmt_to_compound
7317 init = add_stmt_to_compound
7319 }
7320 else
7323 /* Use atexit to register a function for destroying this static
7324 variable. */
7330 {
7334 }
7337 {
7341 }
7342 }
7345 else
7347 }
7349 \f
7350 /* Make TYPE a complete type based on INITIAL_VALUE.
7351 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
7352 2 if there was no information (in which case assume 0 if DO_DEFAULT),
7353 3 if the initializer list is empty (in pedantic mode). */
7355 int
7357 {
7361 /* Don't get confused by a CONSTRUCTOR for some other type. */
7367 {
7369 tree value;
7371 /* An array of character type can be initialized from a
7372 brace-enclosed string constant.
7374 FIXME: this code is duplicated from reshape_init. Probably
7375 we should just call reshape_init here? */
7379 {
7386 }
7388 /* If any of the elements are parameter packs, we can't actually
7389 complete this type now because the array size is dependent. */
7391 {
7394 {
7397 }
7398 }
7399 }
7403 /* We can create the array before the element type is complete, which
7404 means that we didn't have these two bits set in the original type
7405 either. In completing the type, we are expected to propagate these
7406 bits. See also complete_type which does the same thing for arrays
7407 of fixed size. */
7410 {
7415 }
7418 }
7420 /* As above, but either give an error or reject zero-size arrays, depending
7421 on COMPLAIN. */
7423 int
7426 {
7429 /* In SFINAE context we can't be lenient about zero-size arrays. */
7436 {
7442 {
7445 }
7449 }
7451 }
7452 \f
7453 /* Return zero if something is declared to be a member of type
7454 CTYPE when in the context of CUR_TYPE. STRING is the error
7455 message to print in that case. Otherwise, quietly return 1. */
7457 static int
7459 {
7461 {
7464 else
7467 }
7469 }
7470 \f
7471 /* Subroutine of `grokdeclarator'. */
7473 /* Generate errors possibly applicable for a given set of specifiers.
7474 This is for ARM $7.1.2. */
7476 static void
7484 {
7486 {
7525 }
7534 }
7536 /* DECL is a member function or static data member and is presently
7537 being defined. Check that the definition is taking place in a
7538 valid namespace. */
7540 static void
7542 {
7543 /* These checks only apply to member functions and static data
7544 members. */
7546 /* We check for problems with specializations in pt.c in
7547 check_specialization_namespace, where we can issue better
7548 diagnostics. */
7551 /* There are no restrictions on the placement of
7552 explicit instantiations. */
7555 /* [class.mfct]
7557 A member function definition that appears outside of the
7558 class definition shall appear in a namespace scope enclosing
7559 the class definition.
7561 [class.static.data]
7563 The definition for a static data member shall appear in a
7564 namespace scope enclosing the member's class definition. */
7568 }
7570 /* Build a PARM_DECL for the "this" parameter. TYPE is the
7571 METHOD_TYPE for a non-static member function; QUALS are the
7572 cv-qualifiers that apply to the function. */
7574 tree
7576 {
7577 tree this_type;
7578 tree qual_type;
7579 tree parm;
7580 cp_cv_quals this_quals;
7583 {
7584 this_type
7587 }
7588 else
7590 /* The `this' parameter is implicitly `const'; it cannot be
7591 assigned to. */
7597 }
7599 /* DECL is a static member function. Complain if it was declared
7600 with function-cv-quals. */
7602 static void
7604 {
7607 decl);
7608 }
7610 /* Helper function. Replace the temporary this parameter injected
7611 during cp_finish_omp_declare_simd with the real this parameter. */
7613 static tree
7615 {
7624 }
7626 /* CTYPE is class type, or null if non-class.
7627 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
7628 or METHOD_TYPE.
7629 DECLARATOR is the function's name.
7630 PARMS is a chain of PARM_DECLs for the function.
7631 VIRTUALP is truthvalue of whether the function is virtual or not.
7632 FLAGS are to be passed through to `grokclassfn'.
7633 QUALS are qualifiers indicating whether the function is `const'
7634 or `volatile'.
7635 RAISES is a list of exceptions that this function can raise.
7636 CHECK is 1 if we must find this method in CTYPE, 0 if we should
7637 not look, and -1 if we should not call `grokclassfn' at all.
7639 SFK is the kind of special function (if any) for the new function.
7641 Returns `NULL_TREE' if something goes wrong, after issuing
7642 applicable error messages. */
7644 static tree
7646 tree type,
7647 tree declarator,
7648 tree parms,
7649 tree orig_declarator,
7652 cp_cv_quals quals,
7653 cp_ref_qualifier rqual,
7654 tree raises,
7660 special_function_kind sfk,
7663 tree in_namespace,
7665 location_t location)
7666 {
7667 tree decl;
7669 tree t;
7678 /* If we have an explicit location, use it, otherwise use whatever
7679 build_lang_decl used (probably input_location). */
7684 {
7685 tree parm;
7689 }
7693 /* Propagate volatile out from type to decl. */
7697 /* Setup decl according to sfk. */
7699 {
7710 }
7712 /* If pointers to member functions use the least significant bit to
7713 indicate whether a function is virtual, ensure a pointer
7714 to this function will have that bit clear. */
7722 {
7724 error
7726 orig_declarator);
7727 else
7728 {
7733 {
7734 /* Something like `template <class T> friend void f<T>()'. */
7737 orig_declarator);
7739 }
7742 /* A friend declaration of the form friend void f<>(). Record
7743 the information in the TEMPLATE_ID_EXPR. */
7752 {
7755 decl);
7757 }
7762 decl);
7766 decl);
7769 }
7770 }
7772 /* If this decl has namespace scope, set that up. */
7778 /* `main' and builtins have implicit 'C' linkage. */
7791 /* Should probably propagate const out from type to decl I bet (mrs). */
7793 {
7796 }
7802 {
7806 }
7809 {
7820 }
7822 /* Members of anonymous types and local classes have no linkage; make
7823 them internal. If a typedef is made later, this will be changed. */
7829 {
7830 /* [basic.link]: A name with no linkage (notably, the name of a class
7831 or enumeration declared in a local scope) shall not be used to
7832 declare an entity with linkage.
7834 DR 757 relaxes this restriction for C++0x. */
7836 }
7840 {
7843 }
7845 /* If the declaration was declared inline, mark it as such. */
7847 {
7851 }
7857 {
7859 {
7863 decl);
7865 }
7868 {
7872 decl);
7874 }
7875 }
7881 {
7885 /* [over.literal]/6: Literal operators shall not have C linkage. */
7887 {
7890 }
7893 {
7896 {
7899 }
7903 {
7907 }
7909 {
7913 }
7914 }
7915 else
7916 {
7919 }
7920 }
7923 /* Make the init_value nonzero so pushdecl knows this is not
7924 tentative. error_mark_node is replaced later with the BLOCK. */
7931 {
7932 /* Adjust "omp declare simd" attributes. */
7935 {
7936 tree attr;
7939 {
7944 {
7946 cl = c_omp_declare_simd_clauses_to_numbers
7950 else
7952 }
7953 }
7954 }
7955 }
7957 /* Caller will do the rest of this. */
7964 /* 12.4/3 */
7972 template_count,
7982 {
7985 }
7987 /* Check main's type after attributes have been applied. */
7989 {
7991 integer_type_node))
7992 {
7994 tree newtype;
7998 }
8001 }
8006 {
8008 (processing_template_decl
8010 ? current_template_parms
8017 {
8018 tree ok;
8019 tree pushed_scope;
8022 /* Because grokfndecl is always supposed to return a
8023 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
8024 here. We depend on our callers to figure out that its
8025 really a template that's being returned. */
8030 {
8031 /* Remove the `this' parm added by grokclassfn. */
8034 }
8036 {
8039 }
8041 {
8045 }
8047 /* Since we've smashed OLD_DECL to its
8048 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
8052 /* Attempt to merge the declarations. This can fail, in
8053 the case of some invalid specialization declarations. */
8059 {
8063 }
8067 }
8068 }
8080 }
8082 /* decl is a FUNCTION_DECL.
8083 specifiers are the parsed virt-specifiers.
8085 Set flags to reflect the virt-specifiers.
8087 Returns decl. */
8089 static tree
8091 {
8099 }
8101 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
8102 the linkage that DECL will receive in the object file. */
8104 static void
8106 {
8107 /* A static data member always has static storage duration and
8108 external linkage. Note that static data members are forbidden in
8109 local classes -- the only situation in which a class has
8110 non-external linkage. */
8113 /* For non-template classes, static data members are always put
8114 out in exactly those files where they are defined, just as
8115 with ordinary namespace-scope variables. */
8118 }
8120 /* Create a VAR_DECL named NAME with the indicated TYPE.
8122 If SCOPE is non-NULL, it is the class type or namespace containing
8123 the variable. If SCOPE is NULL, the variable should is created in
8124 the innermost enclosing scope. */
8126 static tree
8128 tree name,
8129 tree orig_declarator,
8134 tree scope)
8135 {
8136 tree decl;
8137 tree explicit_scope;
8141 /* Compute the scope in which to place the variable, but remember
8142 whether or not that scope was explicitly specified by the user. */
8145 {
8146 /* An explicit "extern" specifier indicates a namespace-scope
8147 variable. */
8152 }
8156 template, we need DECL_LANG_SPECIFIC. */
8158 /* Similarly for namespace-scope variables with language linkage
8159 other than C++. */
8162 /* Similarly for static data members. */
8164 /* Similarly for explicit specializations. */
8165 || (orig_declarator
8168 else
8173 else
8177 {
8180 }
8183 {
8185 /* This function is only called with out-of-class definitions. */
8188 }
8189 /* At top level, either `static' or no s.c. makes a definition
8190 (perhaps tentative), and absence of `static' makes it public. */
8192 {
8196 }
8197 /* Not at top level, only `static' makes a static definition. */
8198 else
8199 {
8202 }
8205 {
8210 }
8212 /* If the type of the decl has no linkage, make sure that we'll
8213 notice that in mark_used. */
8222 {
8223 /* [basic.link]: A name with no linkage (notably, the name of a class
8224 or enumeration declared in a local scope) shall not be used to
8225 declare an entity with linkage.
8227 DR 757 relaxes this restriction for C++0x. */
8230 }
8231 else
8234 // Handle explicit specializations and instantiations of variable templates.
8240 }
8242 /* Create and return a canonical pointer to member function type, for
8243 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
8245 tree
8247 {
8249 tree t;
8254 /* If a canonical type already exists for this type, use it. We use
8255 this method instead of type_hash_canon, because it only does a
8256 simple equality check on the list of field members. */
8261 /* Make sure that we always have the unqualified pointer-to-member
8262 type first. */
8264 {
8267 }
8271 /* Let the front end know this is a pointer to member function. */
8278 delta_type_node);
8284 /* Zap out the name so that the back end will give us the debugging
8285 information for this anonymous RECORD_TYPE. */
8288 /* Cache this pointer-to-member type so that we can find it again
8289 later. */
8298 }
8300 /* Create and return a pointer to data member type. */
8302 tree
8304 {
8306 {
8311 }
8312 else
8313 {
8316 }
8317 }
8319 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
8320 Check to see that the definition is valid. Issue appropriate error
8321 messages. Return 1 if the definition is particularly bad, or 0
8322 otherwise. */
8324 static int
8326 {
8327 /* Can't check yet if we don't know the type. */
8330 /* If DECL is declared constexpr, we'll do the appropriate checks
8331 in check_initializer. */
8335 {
8341 "%<constexpr%> needed for in-class initialization of "
8343 else
8347 }
8349 /* Motion 10 at San Diego: If a static const integral data member is
8350 initialized with an integral constant expression, the initializer
8351 may appear either in the declaration (within the class), or in
8352 the definition, but not both. If it appears in the class, the
8353 member is a member constant. The file-scope definition is always
8354 required. */
8356 {
8359 type);
8361 }
8365 decl);
8371 }
8373 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
8374 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
8375 expressions out into temporary variables so that walk_tree doesn't
8376 step into them (c++/15764). */
8378 static tree
8380 {
8384 {
8390 }
8394 }
8396 /* Entry point for the above. */
8398 static void
8400 {
8402 /* Break out any function calls into temporary variables. */
8404 }
8406 /* Helper function for compute_array_index_type. Look for SIZEOF_EXPR
8407 not inside of SAVE_EXPR and fold them. */
8409 static tree
8411 {
8416 {
8424 else
8431 }
8433 }
8435 /* Given the SIZE (i.e., number of elements) in an array, compute an
8436 appropriate index type for the array. If non-NULL, NAME is the
8437 name of the thing being declared. */
8439 tree
8441 {
8442 tree itype;
8449 {
8456 /* In C++98, we mark a non-constant array bound with a magic
8458 else
8459 {
8464 {
8467 {
8473 else
8476 }
8480 }
8487 }
8492 /* The array bound must be an integer type. */
8494 {
8499 else
8503 }
8504 }
8506 /* A type is dependent if it is...an array type constructed from any
8507 dependent type or whose size is specified by a constant expression
8508 that is value-dependent. */
8509 /* We can only call value_dependent_expression_p on integral constant
8510 expressions; treat non-constant expressions as dependent, too. */
8514 {
8515 /* We cannot do any checking for a SIZE that isn't known to be
8516 constant. Just build the index type and mark that it requires
8517 structural equality checks. */
8524 }
8526 /* Normally, the array-bound will be a constant. */
8528 {
8529 /* Check to see if the array bound overflowed. Make that an
8530 error, no matter how generous we're being. */
8533 /* An array must have a positive number of elements. */
8535 {
8540 else
8543 }
8544 /* As an extension we allow zero-sized arrays. */
8546 {
8548 /* We must fail if performing argument deduction (as
8549 indicated by the state of complain), so that
8550 another substitution can be found. */
8556 else
8558 }
8559 }
8561 /* We don't allow VLAs at non-function scopes, or during
8562 tentative template substitution. */
8565 {
8568 /* `(int) &fn' is not a valid array bound. */
8571 name);
8572 else
8575 }
8577 {
8580 else
8582 }
8584 {
8588 else
8591 }
8594 /* A variable sized array. */
8596 else
8597 {
8598 HOST_WIDE_INT saved_processing_template_decl;
8600 /* Compute the index of the largest element in the array. It is
8601 one less than the number of elements in the array. We save
8602 and restore PROCESSING_TEMPLATE_DECL so that computations in
8603 cp_build_binary_op will be appropriately folded. */
8607 MINUS_EXPR,
8610 complain),
8611 complain);
8616 {
8617 /* A variable sized array. */
8621 {
8622 /* Look for SIZEOF_EXPRs in itype and fold them, otherwise
8623 they might survive till gimplification. */
8630 }
8636 {
8637 /* We have to add 1 -- in the ubsan routine we generate
8638 LE_EXPR rather than LT_EXPR. */
8643 }
8644 }
8645 /* Make sure that there was no overflow when creating to a signed
8646 index type. (For example, on a 32-bit machine, an array with
8647 size 2^32 - 1 is too big.) */
8650 {
8655 }
8656 }
8658 /* Create and return the appropriate index type. */
8661 /* If the index type were dependent, we would have returned early, so
8662 remember that it isn't. */
8666 }
8668 /* Returns the scope (if any) in which the entity declared by
8669 DECLARATOR will be located. If the entity was declared with an
8670 unqualified name, NULL_TREE is returned. */
8672 tree
8674 {
8678 /* If the declarator-id is a SCOPE_REF, the scope in which the
8679 declaration occurs is the first operand. */
8684 /* Otherwise, the declarator is not a qualified name; the entity will
8685 be declared in the current scope. */
8687 }
8689 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
8690 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
8691 with this type. */
8693 static tree
8695 {
8698 /* If things have already gone awry, bail now. */
8702 /* 8.3.4/1: If the type of the identifier of D contains the auto
8703 type-specifier, the program is ill-formed. */
8705 {
8708 }
8710 /* If there are some types which cannot be array elements,
8711 issue an error-message and return. */
8713 {
8717 else
8724 else
8731 else
8738 else
8744 }
8746 /* [dcl.array]
8748 The constant expressions that specify the bounds of the arrays
8749 can be omitted only for the first member of the sequence. */
8751 {
8755 name);
8756 else
8761 }
8763 /* Figure out the index type for the array. */
8767 /* [dcl.array]
8768 T is called the array element type; this type shall not be [...] an
8769 abstract class type. */
8773 }
8775 /* Check that it's OK to declare a function with the indicated TYPE.
8776 SFK indicates the kind of special function (if any) that this
8777 function is. OPTYPE is the type given in a conversion operator
8778 declaration, or the class type for a constructor/destructor.
8779 Returns the actual return type of the function; that
8780 may be different than TYPE if an error occurs, or for certain
8781 special functions. */
8783 static tree
8785 tree type,
8786 tree optype)
8787 {
8789 {
8796 else
8803 /* We can't use the proper return type here because we run into
8804 problems with ambiguous bases and covariant returns.
8805 Java classes are left unchanged because (void *) isn't a valid
8806 Java type, and we don't want to change the Java ABI. */
8809 else
8821 }
8824 }
8826 /* A variable or data member (whose unqualified name is IDENTIFIER)
8827 has been declared with the indicated TYPE. If the TYPE is not
8828 acceptable, issue an error message and return a type to use for
8829 error-recovery purposes. */
8831 tree
8833 {
8835 {
8839 {
8842 }
8843 else
8846 }
8849 }
8851 /* Given declspecs and a declarator (abstract or otherwise), determine
8852 the name and type of the object declared and construct a DECL node
8853 for it.
8855 DECLSPECS points to the representation of declaration-specifier
8856 sequence that precedes declarator.
8858 DECL_CONTEXT says which syntactic context this declaration is in:
8859 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
8860 FUNCDEF for a function definition. Like NORMAL but a few different
8861 error messages in each case. Return value may be zero meaning
8862 this definition is too screwy to try to parse.
8863 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
8864 handle member functions (which have FIELD context).
8865 Return value may be zero meaning this definition is too screwy to
8866 try to parse.
8867 PARM for a parameter declaration (either within a function prototype
8868 or before a function body). Make a PARM_DECL, or return void_type_node.
8869 TPARM for a template parameter declaration.
8870 CATCHPARM for a parameter declaration before a catch clause.
8871 TYPENAME if for a typename (in a cast or sizeof).
8872 Don't make a DECL node; just return the ..._TYPE node.
8873 FIELD for a struct or union field; make a FIELD_DECL.
8874 BITFIELD for a field with specified width.
8876 INITIALIZED is as for start_decl.
8878 ATTRLIST is a pointer to the list of attributes, which may be NULL
8879 if there are none; *ATTRLIST may be modified if attributes from inside
8880 the declarator should be applied to the declaration.
8882 When this function is called, scoping variables (such as
8883 CURRENT_CLASS_TYPE) should reflect the scope in which the
8884 declaration occurs, not the scope in which the new declaration will
8885 be placed. For example, on:
8887 void S::f() { ... }
8889 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
8890 should not be `S'.
8892 Returns a DECL (if a declarator is present), a TYPE (if there is no
8893 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
8894 error occurs. */
8896 tree
8902 {
8914 /* True if this declarator is a function definition. */
8918 #if 0
8919 /* See the code below that used this. */
8921 #endif
8923 /* Keep track of what sort of function is being processed
8924 so that we can warn about default return values, or explicit
8925 return values which do not match prescribed defaults. */
8931 /* cv-qualifiers that apply to the declarator, for a declaration of
8932 a member function. */
8934 /* virt-specifiers that apply to the declarator, for a declaration of
8935 a member function. */
8937 /* ref-qualifier that applies to the declarator, for a declaration of
8938 a member function. */
8940 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
8947 /* The unqualified name of the declarator; either an
8948 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
8949 tree unqualified_id;
8950 /* The class type, if any, in which this entity is located,
8951 or NULL_TREE if none. Note that this value may be different from
8952 the current class type; for example if an attempt is made to declare
8953 "A::f" inside "B", this value will be "A". */
8955 /* The NAMESPACE_DECL for the namespace in which this entity is
8956 located. If an unqualified name is used to declare the entity,
8957 this value will be NULL_TREE, even if the entity is located at
8958 namespace scope. */
8960 cp_storage_class storage_class;
8995 /* Look inside a declarator for the name being declared
8996 and get it as a string, for an error message. */
8998 id_declarator;
9000 {
9005 {
9009 {
9013 }
9017 {
9023 {
9025 {
9026 /* [dcl.meaning]
9028 A declarator-id shall not be qualified except
9029 for ...
9031 None of the cases are permitted in block
9032 scope. */
9035 decl);
9039 else
9043 }
9045 {
9048 {
9051 }
9053 && current_class_type
9055 current_class_type))
9056 {
9060 }
9061 }
9064 }
9066 {
9068 {
9069 tree type;
9072 {
9075 }
9078 {
9081 }
9088 }
9092 {
9097 {
9100 else
9101 {
9104 }
9105 }
9106 }
9107 /* Fall through. */
9114 {
9116 dname);
9118 }
9121 else
9122 {
9129 else
9131 }
9136 }
9138 }
9151 }
9154 }
9156 /* [dcl.fct.edf]
9158 The declarator in a function-definition shall have the form
9159 D1 ( parameter-declaration-clause) ... */
9161 {
9164 }
9169 {
9172 }
9178 {
9181 }
9184 {
9186 {
9189 }
9191 {
9194 }
9195 }
9197 /* Anything declared one level down from the top level
9198 must be one of the parameters of a function
9199 (because the body is at least two levels down). */
9201 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
9202 by not allowing C++ class definitions to specify their parameters
9203 with xdecls (must be spec.d in the parmlist).
9205 Since we now wait to push a class scope until we are sure that
9206 we are in a legitimate method context, we must set oldcname
9207 explicitly (since current_class_name is not yet alive).
9209 We also want to avoid calling this a PARM if it is in a namespace. */
9212 {
9218 }
9224 {
9227 }
9229 /* If there were multiple types specified in the decl-specifier-seq,
9230 issue an error message. */
9232 {
9235 }
9238 {
9241 }
9243 /* Extract the basic type from the decl-specifier-seq. */
9246 {
9249 }
9250 /* If the entire declaration is itself tagged as deprecated then
9251 suppress reports of deprecated items. */
9256 {
9263 }
9264 /* No type at all: default to `int', and set DEFAULTED_INT
9265 because it was not a user-defined typedef. */
9267 {
9269 {
9270 /* These imply 'int'. */
9273 }
9274 /* If we just have "complex", it is equivalent to "complex double". */
9277 {
9280 "ISO C++ does not support plain %<complex%> meaning "
9282 }
9283 }
9284 /* Gather flags. */
9288 #if 0
9289 /* See the code below that used this. */
9292 #endif
9301 ctor_return_type);
9303 {
9308 /* We handle `main' specially here, because 'main () { }' is so
9309 common. With no options, it is allowed. With -Wreturn-type,
9310 it is a warning. It is only an error with -pedantic-errors. */
9311 is_main = (funcdef_flag
9327 else
9332 }
9337 {
9339 {
9343 }
9348 }
9350 /* Now process the modifiers that were specified
9351 and check for invalid combinations. */
9353 /* Long double is a special combination. */
9355 {
9359 }
9361 /* Check all other uses of type modifiers. */
9364 {
9386 {
9391 }
9392 else
9393 {
9396 {
9399 name);
9402 }
9403 }
9405 /* Discard the type modifiers if they are invalid. */
9407 {
9413 }
9414 }
9416 /* Decide whether an integer type is signed or not.
9417 Optionally treat bitfields as signed by default. */
9419 /* [class.bit]
9421 It is implementation-defined whether a plain (neither
9422 explicitly signed or unsigned) char, short, int, or long
9423 bit-field is signed or unsigned.
9425 Naturally, we extend this to long long as well. Note that
9426 this does not include wchar_t. */
9428 && !signed_p
9429 /* A typedef for plain `int' without `signed' can be
9430 controlled just like plain `int', but a typedef for
9431 `signed int' cannot be so controlled. */
9432 && !(typedef_decl
9436 {
9449 else
9451 }
9464 {
9467 /* If a modifier is specified, the resulting complex is the complex
9468 form of TYPE. E.g, "complex short" is "complex short int". */
9477 else
9479 }
9490 ctor_return_type);
9492 /* If we're using the injected-class-name to form a compound type or a
9493 declaration, replace it with the underlying class so we don't get
9494 redundant typedefs in the debug output. But if we are returning the
9495 type unchanged, leave it alone so that it's available to
9496 maybe_get_template_decl_from_type_decl. */
9504 type = cp_build_qualified_type_real
9508 /* We might have ignored or rejected some of the qualifiers. */
9521 {
9525 }
9528 /* Issue errors about use of storage classes for parameters. */
9530 {
9532 {
9535 }
9537 {
9540 }
9546 /* Function parameters cannot be constexpr. If we saw one, moan
9547 and pretend it wasn't there. */
9549 {
9552 }
9553 }
9555 /* Give error if `virtual' is used outside of class declaration. */
9558 {
9561 }
9563 /* Static anonymous unions are dealt with here. */
9569 /* Warn about storage classes that are invalid for certain
9570 kinds of declarations (parameters, typenames, etc.). */
9572 && ((storage_class
9576 {
9579 }
9584 {
9588 ;
9590 ;
9592 /* C++ allows static class elements. */
9594 /* C++ also allows inlines and signed and unsigned elements,
9595 but in those cases we don't come in here. */
9596 ;
9597 else
9598 {
9601 else
9602 {
9605 else
9607 }
9613 }
9614 }
9619 {
9622 }
9626 {
9631 /* When thread_local is applied to a variable of block scope the
9632 storage-class-specifier static is implied if it does not appear
9633 explicitly. */
9636 }
9639 {
9643 }
9647 else
9648 {
9651 {
9664 }
9665 }
9668 {
9669 /* Apply the c++11 attributes to the type preceding them. */
9673 }
9675 /* Determine the type of the entity declared by recurring on the
9676 declarator. */
9678 {
9680 tree attrs;
9687 {
9699 attr_flags);
9700 }
9708 {
9713 /* [dcl.array]/1:
9715 The optional attribute-specifier-seq appertains to the
9716 array. */
9722 {
9723 tree arg_types;
9726 /* Declaring a function type.
9727 Make sure we have a valid type for the function to return. */
9730 {
9734 /* We now know that the TYPE_QUALS don't apply to the
9735 decl, but to its return type. */
9737 }
9740 {
9743 }
9745 /* Error about some types functions can't return. */
9748 {
9751 }
9753 {
9756 }
9762 /* Pick up type qualifiers which should be applied to `this'. */
9764 /* Pick up virt-specifiers. */
9766 /* And ref-qualifier, too */
9768 /* Pick up the exception specifications. */
9770 /* If the exception-specification is ill-formed, let's pretend
9771 there wasn't one. */
9775 /* Say it's a definition only for the CALL_EXPR
9776 closest to the identifier. */
9779 /* Handle a late-specified return type. */
9781 {
9783 {
9785 {
9790 {
9792 "%<auto%> type specifier without trailing "
9795 "only available with -std=c++14 or "
9797 }
9799 {
9803 }
9804 }
9806 {
9811 }
9812 }
9814 {
9816 /* Not using maybe_warn_cpp0x because this should
9817 always be an error. */
9820 else
9824 }
9825 }
9826 type = splice_late_return_type
9836 && funcdecl_p
9842 {
9843 /* We are within a class's scope. If our declarator name
9844 is the same as the class name, and we are defining
9845 a function, then it is a constructor/destructor, and
9846 therefore returns a void type. */
9848 /* ISO C++ 12.4/2. A destructor may not be declared
9849 const or volatile. A destructor may not be static.
9850 A destructor may not be declared with ref-qualifier.
9852 ISO C++ 12.1. A constructor may not be declared
9853 const or volatile. A constructor may not be
9854 virtual. A constructor may not be static.
9855 A constructor may not be declared with ref-qualifier. */
9861 {
9866 }
9869 {
9875 }
9879 current_class_type,
9880 flags))
9884 {
9885 /* It's a constructor. */
9889 {
9892 }
9896 }
9899 }
9901 {
9903 {
9904 /* Cannot be both friend and virtual. */
9907 }
9913 name);
9914 }
9916 {
9918 {
9921 }
9922 }
9931 {
9935 }
9939 /* [dcl.fct]/2:
9941 The optional attribute-specifier-seq appertains to
9942 the function type. */
9945 }
9951 /* Filter out pointers-to-references and references-to-references.
9952 We can get these if a TYPE_DECL is used. */
9955 {
9957 {
9960 }
9962 /* In C++0x, we allow reference to reference declarations
9963 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
9964 and template type arguments [14.3.1/4 temp.arg.type]. The
9965 check for direct reference to reference declarations, which
9966 are still forbidden, occurs below. Reasoning behind the change
9967 can be found in DR106, DR540, and the rvalue reference
9968 proposals. */
9970 {
9973 }
9974 }
9976 {
9981 }
9983 /* We now know that the TYPE_QUALS don't apply to the decl,
9984 but to the target of the pointer. */
9987 /* This code used to handle METHOD_TYPE, but I don't think it's
9988 possible to get it here anymore. */
9992 {
9996 memfn_quals,
9997 rqual);
10003 }
10011 type);
10013 /* When the pointed-to type involves components of variable size,
10014 care must be taken to ensure that the size evaluation code is
10015 emitted early enough to dominate all the possible later uses
10016 and late enough for the variables on which it depends to have
10017 been assigned.
10019 This is expected to happen automatically when the pointed-to
10020 type has a name/declaration of it's own, but special attention
10021 is required if the type is anonymous.
10023 We handle the NORMAL and FIELD contexts here by inserting a
10024 dummy statement that just evaluates the size at a safe point
10025 and ensures it is not deferred until e.g. within a deeper
10026 conditional context (c++/43555).
10028 We expect nothing to be needed here for PARM or TYPENAME.
10029 Evaluating the size at this point for TYPENAME would
10030 actually be incorrect, as we might be in the middle of an
10031 expression with side effects on the pointed-to type size
10032 "arguments" prior to the pointer declaration point and the
10033 size evaluation could end up prior to the side effects. */
10039 /* Force evaluation of the SAVE_EXPR. */
10043 {
10044 /* In C++0x, the type we are creating a reference to might be
10045 a typedef which is itself a reference type. In that case,
10046 we follow the reference collapsing rules in
10047 [7.1.3/8 dcl.typedef] to create the final reference type:
10049 "If a typedef TD names a type that is a reference to a type
10050 T, an attempt to create the type 'lvalue reference to cv TD'
10051 creates the type 'lvalue reference to T,' while an attempt
10052 to create the type "rvalue reference to cv TD' creates the
10053 type TD."
10054 */
10058 {
10061 else
10063 }
10064 else
10065 type = cp_build_reference_type
10068 /* In C++0x, we need this check for direct reference to
10069 reference declarations, which are forbidden by
10070 [8.3.2/5 dcl.ref]. Reference to reference declarations
10071 are only allowed indirectly through typedefs and template
10072 type arguments. Example:
10074 void foo(int & &); // invalid ref-to-ref decl
10076 typedef int & int_ref;
10077 void foo(int_ref &); // valid ref-to-ref decl
10078 */
10082 }
10086 {
10090 /* We will already have complained. */
10092 else
10094 type);
10095 }
10096 else
10099 /* Process a list of type modifier keywords (such as
10100 const or volatile) that were given inside the `*' or `&'. */
10103 {
10104 type
10108 }
10110 /* Apply C++11 attributes to the pointer, and not to the
10111 type pointed to. This is unlike what is done for GNU
10112 attributes above. It is to comply with [dcl.ptr]/1:
10114 [the optional attribute-specifier-seq (7.6.1) appertains
10115 to the pointer and not to the object pointed to]. */
10128 }
10129 }
10131 /* A `constexpr' specifier used in an object declaration declares
10132 the object as `const'. */
10134 {
10138 {
10141 }
10142 }
10148 {
10150 unqualified_id);
10152 }
10154 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
10155 qualified with a class-name, turn it into a METHOD_TYPE, unless
10156 we know that the function is static. We take advantage of this
10157 opportunity to do other processing that pertains to entities
10158 explicitly declared to be class members. Note that if DECLARATOR
10159 is non-NULL, we know it is a cdk_id declarator; otherwise, we
10160 would not have exited the loop above. */
10164 {
10170 {
10172 {
10175 }
10176 else
10180 }
10182 can skip the following checks. */
10185 qualifying type must certainly be complete. */
10186 funcdef_flag
10187 /* A friend declaration of "T::f" is OK, even if
10188 "T" is a template parameter. But, if this
10189 function is not a friend, the qualifying type
10190 must be a class. */
10192 /* For a declaration, the type need not be
10193 complete, if either it is dependent (since there
10194 is no meaningful definition of complete in that
10195 case) or the qualifying class is currently being
10196 defined. */
10199 /* Check that the qualifying type is complete. */
10203 {
10206 {
10214 }
10215 }
10217 {
10221 }
10222 }
10227 /* Now TYPE has the actual type. */
10230 {
10233 else
10235 }
10240 /* [dcl.meaning]/1: The optional attribute-specifier-seq following
10241 a declarator-id appertains to the entity that is declared. */
10244 /* Handle parameter packs. */
10246 {
10248 /* Turn the type into a pack expansion.*/
10250 else
10252 }
10254 /* Did array size calculations overflow or does the array cover more
10255 than half of the address-space? */
10260 {
10262 /* If we proceed with the array type as it is, we'll eventually
10263 crash in tree_to_[su]hwi(). */
10265 }
10268 && !processing_template_decl
10270 {
10273 else
10276 }
10279 {
10280 /* [dcl.fct.spec] (C++11) The explicit specifier shall be used only
10281 in the declaration of a constructor or conversion function within
10282 a class definition. */
10287 else
10291 }
10294 {
10296 {
10299 }
10301 {
10304 }
10307 {
10310 }
10312 {
10315 }
10317 {
10320 }
10322 {
10326 }
10327 }
10329 /* If this is declaring a typedef name, return a TYPE_DECL. */
10331 {
10332 tree decl;
10334 /* Note that the grammar rejects storage classes
10335 in typenames, fields or parameters. */
10339 /* This declaration:
10341 typedef void f(int) const;
10343 declares a function type which is not a member of any
10344 particular class, but which is cv-qualified; for
10345 example "f S::*" declares a pointer to a const-qualified
10346 member function of S. We record the cv-qualification in the
10347 function type. */
10349 {
10352 /* We have now dealt with these qualifiers. */
10355 }
10358 {
10361 }
10365 else
10371 }
10374 {
10378 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
10380 /* The TYPE_DECL is "abstract" because there will be
10381 clones of this constructor/destructor, and there will
10382 be copies of this TYPE_DECL generated in those
10383 clones. The decloning optimization (for space) may
10384 revert this subsequently if it determines that
10385 the clones should share a common implementation. */
10387 }
10392 unqualified_id);
10394 /* If the user declares "typedef struct {...} foo" then the
10395 struct will have an anonymous name. Fill that name in now.
10396 Nothing can refer to it, so nothing needs know about the name
10397 change. */
10399 && unqualified_id
10406 {
10407 tree t;
10409 /* Replace the anonymous name with the real name everywhere. */
10411 {
10413 /* We do not rename the debug info representing the
10414 anonymous tagged type because the standard says in
10415 [dcl.typedef] that the naming applies only for
10416 linkage purposes. */
10417 /*debug_hooks->set_name (t, decl);*/
10419 }
10424 /* If this is a typedef within a template class, the nested
10425 type is a (non-primary) template. The name for the
10426 template needs updating as well. */
10431 /* Adjust linkage now that we aren't anonymous anymore. */
10434 /* FIXME remangle member functions; member functions of a
10435 type with external linkage have external linkage. */
10436 }
10447 /* Acknowledge that this was written:
10448 `using analias = atype;'. */
10452 }
10454 /* Detect the case of an array type of unspecified size
10455 which came, as such, direct from a typedef name.
10456 We must copy the type, so that the array's domain can be
10457 individually set by the object's initializer. */
10464 /* Detect where we're using a typedef of function type to declare a
10465 function. PARMS will not be set, so we must create it now. */
10468 {
10470 tree args;
10475 {
10480 }
10485 {
10486 /* The qualifiers on the function type become the qualifiers on
10487 the non-static member function. */
10491 }
10492 }
10494 /* If this is a type name (such as, in a cast or sizeof),
10495 compute the type and return it now. */
10498 {
10499 /* Note that the grammar rejects storage classes
10500 in typenames, fields or parameters. */
10504 /* Special case: "friend class foo" looks like a TYPENAME context. */
10506 {
10508 {
10511 }
10513 {
10516 }
10519 {
10520 /* Don't allow friend declaration without a class-key. */
10527 else
10530 type);
10531 }
10533 /* Only try to do this stuff if we didn't already give up. */
10535 {
10536 /* A friendly class? */
10540 else
10542 type);
10545 }
10546 }
10548 {
10555 /* Core issue #547: need to allow this in template type args.
10556 Allow it in general in C++11 for alias-declarations. */
10560 else
10562 }
10565 }
10570 {
10573 }
10575 /* Only functions may be declared using an operator-function-id. */
10580 {
10583 }
10585 /* We don't check parameter types here because we can emit a better
10586 error message later. */
10588 {
10592 }
10594 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
10595 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
10598 {
10603 {
10606 else
10609 }
10611 /* A parameter declared as an array of T is really a pointer to T.
10612 One declared as a function is really a pointer to a function.
10613 One declared as a member is really a pointer to member. */
10616 {
10617 /* Transfer const-ness of array into that of type pointed to. */
10621 }
10624 }
10628 {
10634 }
10636 {
10637 tree decl;
10640 {
10647 }
10649 {
10652 {
10655 }
10657 /* The C99 flexible array extension. */
10660 {
10662 tf_warning_or_error);
10664 }
10667 {
10668 /* Happens when declaring arrays of sizes which
10669 are error_mark_node, for example. */
10671 }
10673 {
10674 /* Something like struct S { int N::j; }; */
10677 }
10680 {
10682 tree function_context;
10685 {
10686 /* This should never happen in pure C++ (the check
10687 could be an assert). It could happen in
10688 Objective-C++ if someone writes invalid code that
10689 uses a function declaration for an instance
10690 variable or property (instance variables and
10691 properties are parsed as FIELD_DECLs, but they are
10692 part of an Objective-C class, not a C++ class).
10693 That code is invalid and is caught by this
10694 check. */
10696 {
10698 unqualified_id);
10700 }
10702 /* ``A union may [ ... ] not [ have ] virtual functions.''
10703 ARM 9.5 */
10705 {
10707 unqualified_id);
10709 }
10712 {
10714 {
10717 unqualified_id);
10719 }
10720 }
10721 }
10723 /* Check that the name used for a destructor makes sense. */
10725 {
10729 {
10734 }
10737 {
10741 }
10743 {
10746 }
10747 }
10749 {
10754 }
10757 {
10760 {
10766 }
10767 }
10769 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
10781 parms,
10782 unqualified_id,
10792 #if 0
10793 /* This clobbers the attrs stored in `decl' from `attrlist'. */
10794 /* The decl and setting of decl_attr is also turned off. */
10796 #endif
10798 /* [class.conv.ctor]
10800 A constructor declared without the function-specifier
10801 explicit that can be called with a single parameter
10802 specifies a conversion from the type of its first
10803 parameter to the type of its class. Such a constructor
10804 is called a converting constructor. */
10807 }
10813 {
10815 {
10819 }
10820 else
10825 }
10826 else
10827 {
10829 {
10833 }
10835 }
10838 {
10839 /* Friends are treated specially. */
10843 {
10845 {
10846 decl = check_explicit_specialization
10851 }
10855 funcdef_flag);
10857 }
10858 else
10860 }
10862 /* Structure field. It may not be a function, except for C++. */
10865 {
10867 {
10868 /* C++ allows static class members. All other work
10869 for this is done by grokfield. */
10875 /* Even if there is an in-class initialization, DECL
10876 is considered undefined until an out-of-class
10877 definition is provided. */
10881 {
10885 }
10888 {
10892 }
10893 }
10894 else
10895 {
10897 {
10899 unqualified_id);
10901 }
10909 {
10912 }
10915 {
10916 /* An attempt is being made to initialize a non-static
10917 member. This is new in C++11. */
10920 /* If this has been parsed with static storage class, but
10921 errors forced staticp to be cleared, ensure NSDMI is
10922 not present. */
10925 }
10926 }
10931 }
10932 }
10935 {
10936 tree original_name;
10944 else
10952 {
10955 name);
10956 else
10958 name);
10959 }
10963 /* Function declaration not at top level.
10964 Storage classes other than `extern' are not allowed
10965 and `extern' makes no difference. */
10970 {
10973 "%<static%> specified invalid for function %qs "
10975 else
10977 "%<inline%> specifier invalid for function %qs "
10979 }
10982 {
10984 {
10987 }
10990 {
10995 }
10996 }
10998 /* Record whether the function is public. */
11010 funcdef_flag,
11017 {
11020 /* Don't allow a static member function in a class, and forbid
11021 declaring main to be static. */
11023 {
11027 }
11029 {
11030 /* FIXME need arm citation */
11033 }
11036 {
11039 }
11040 }
11041 }
11042 else
11043 {
11044 /* It's a variable. */
11046 /* An uninitialized decl with `extern' is a reference. */
11048 declspecs,
11049 initialized,
11051 template_count,
11061 {
11064 {
11069 }
11071 {
11074 }
11076 {
11078 "cannot explicitly declare member %q#D to have "
11081 }
11082 }
11084 {
11086 decl);
11088 }
11089 }
11092 {
11094 {
11095 /* It's common practice (and completely valid) to have a const
11096 be initialized and declared extern. */
11099 }
11100 else
11101 {
11104 }
11105 }
11107 /* Record `register' declaration for warnings on &
11108 and in case doing stupid register allocation. */
11117 /* Set constexpr flag on vars (functions got it in grokfndecl). */
11121 /* Record constancy and volatility on the DECL itself . There's
11122 no need to do this when processing a template; we'll do this
11123 for the instantiated declaration based on the type of DECL. */
11128 }
11129 }
11130 \f
11131 /* Subroutine of start_function. Ensure that each of the parameter
11132 types (as listed in PARMS) is complete, as is required for a
11133 function definition. */
11135 static void
11137 {
11139 {
11144 {
11147 }
11148 else
11149 /* grokparms or complete_type_or_else will have already issued
11150 an error. */
11152 }
11153 }
11155 /* Returns nonzero if T is a local variable. */
11157 int
11159 {
11161 /* A VAR_DECL with a context that is a _TYPE is a static data
11162 member. */
11164 /* Any other non-local variable must be at namespace scope. */
11170 }
11172 /* Like local_variable_p, but suitable for use as a tree-walking
11173 function. */
11175 static tree
11178 {
11186 }
11188 /* Check that ARG, which is a default-argument expression for a
11189 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
11190 something goes wrong. DECL may also be a _TYPE node, rather than a
11191 DECL, if there is no DECL available. */
11193 tree
11195 {
11196 tree var;
11197 tree decl_type;
11200 /* We get a DEFAULT_ARG when looking at an in-class declaration
11201 with a default argument. Ignore the argument for now; we'll
11202 deal with it after the class is complete. */
11206 {
11209 }
11210 else
11217 /* Something already went wrong. There's no need to check
11218 further. */
11221 /* [dcl.fct.default]
11223 A default argument expression is implicitly converted to the
11224 parameter type. */
11227 LOOKUP_IMPLICIT);
11237 /* [dcl.fct.default]
11239 Local variables shall not be used in default argument
11240 expressions.
11242 The keyword `this' shall not be used in a default argument of a
11243 member function. */
11246 {
11248 {
11252 else
11254 }
11256 }
11258 /* All is well. */
11260 }
11262 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
11264 static tree
11266 {
11274 /* Do warn about using typedefs to a deprecated class. */
11286 return type_is_deprecated
11290 }
11292 /* Decode the list of parameter types for a function type.
11293 Given the list of things declared inside the parens,
11294 return a list of types.
11296 If this parameter does not end with an ellipsis, we append
11297 void_list_node.
11299 *PARMS is set to the chain of PARM_DECLs created. */
11301 static tree
11303 {
11306 tree parm;
11310 {
11324 {
11326 && !init
11329 /* DR 577: A parameter list consisting of a single
11330 unnamed parameter of non-dependent type 'void'. */
11334 "invalid use of cv-qualified type %qT in "
11336 else
11338 "invalid use of type %<void%> in parameter "
11340 /* It's not a good idea to actually create parameters of
11341 type `void'; other parts of the compiler assume that a
11342 void type terminates the parameter list. */
11345 }
11350 {
11355 }
11359 {
11363 }
11366 {
11368 {
11372 }
11374 /* Top-level qualifiers on the parameters are
11375 ignored for function types. */
11378 {
11382 }
11386 {
11387 /* [dcl.fct]/6, parameter types cannot contain pointers
11388 (references) to arrays of unknown bound. */
11393 {
11401 }
11409 }
11415 }
11420 }
11428 }
11430 \f
11431 /* D is a constructor or overloaded `operator='.
11433 Let T be the class in which D is declared. Then, this function
11434 returns:
11436 -1 if D's is an ill-formed constructor or copy assignment operator
11437 whose first parameter is of type `T'.
11438 0 if D is not a copy constructor or copy assignment
11439 operator.
11440 1 if D is a copy constructor or copy assignment operator whose
11441 first parameter is a reference to non-const qualified T.
11442 2 if D is a copy constructor or copy assignment operator whose
11443 first parameter is a reference to const qualified T.
11445 This function can be used as a predicate. Positive values indicate
11446 a copy constructor and nonzero values indicate a copy assignment
11447 operator. */
11449 int
11451 {
11452 tree args;
11453 tree arg_type;
11461 /* Instantiations of template member functions are never copy
11462 functions. Note that member functions of templated classes are
11463 represented as template functions internally, and we must
11464 accept those as copy functions. */
11476 {
11477 /* Pass by value copy assignment operator. */
11479 }
11483 {
11486 }
11487 else
11493 /* There are more non-optional args. */
11497 }
11499 /* D is a constructor or overloaded `operator='.
11501 Let T be the class in which D is declared. Then, this function
11502 returns true when D is a move constructor or move assignment
11503 operator, false otherwise. */
11505 bool
11507 {
11511 /* There are no move constructors if we are in C++98 mode. */
11517 /* Instantiations of template member functions are never move
11518 functions. Note that member functions of templated classes are
11519 represented as template functions internally, and we must
11520 accept those as move functions. */
11524 }
11526 /* D is a constructor or overloaded `operator='.
11528 Then, this function returns true when D has the same signature as a move
11529 constructor or move assignment operator (because either it is such a
11530 ctor/op= or it is a template specialization with the same signature),
11531 false otherwise. */
11533 bool
11535 {
11536 tree args;
11537 tree arg_type;
11557 /* There are more non-optional args. */
11561 }
11563 /* Remember any special properties of member function DECL. */
11565 void
11567 {
11568 tree class_type;
11575 {
11582 {
11583 /* [class.copy]
11585 A non-template constructor for class X is a copy
11586 constructor if its first parameter is of type X&, const
11587 X&, volatile X& or const volatile X&, and either there
11588 are no other parameters or else all other parameters have
11589 default arguments. */
11595 }
11606 }
11608 {
11609 /* [class.copy]
11611 A non-template assignment operator for class X is a copy
11612 assignment operator if its parameter is of type X, X&, const
11613 X&, volatile X& or const volatile X&. */
11618 {
11624 }
11627 }
11628 /* Destructors are handled in check_methods. */
11629 }
11631 /* Check a constructor DECL has the correct form. Complains
11632 if the class has a constructor of the form X(X). */
11634 int
11636 {
11640 {
11641 /* [class.copy]
11643 A declaration of a constructor for a class X is ill-formed if
11644 its first parameter is of type (optionally cv-qualified) X
11645 and either there are no other parameters or else all other
11646 parameters have default arguments.
11648 We *don't* complain about member template instantiations that
11649 have this form, though; they can occur as we try to decide
11650 what constructor to use during overload resolution. Since
11651 overload resolution will never prefer such a constructor to
11652 the non-template copy constructor (which is either explicitly
11653 or implicitly defined), there's no need to worry about their
11654 existence. Theoretically, they should never even be
11655 instantiated, but that's hard to forestall. */
11659 }
11662 }
11664 /* An operator with this code is unary, but can also be binary. */
11666 static int
11668 {
11675 }
11677 /* An operator with this name can only be unary. */
11679 static int
11681 {
11686 }
11688 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
11689 errors are issued for invalid declarations. */
11691 bool
11693 {
11695 tree argtype;
11701 tree class_type;
11703 /* Count the number of arguments and check for ellipsis. */
11716 else
11717 do
11718 {
11719 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
11720 if (ansi_opname (CODE) == name) \
11721 { \
11722 operator_code = (CODE); \
11723 break; \
11724 } \
11725 else if (ansi_assopname (CODE) == name) \
11726 { \
11727 operator_code = (CODE); \
11728 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
11729 break; \
11730 }
11733 #undef DEF_OPERATOR
11736 }
11743 {
11762 }
11764 /* [basic.std.dynamic.allocation]/1:
11766 A program is ill-formed if an allocation function is declared
11767 in a namespace scope other than global scope or declared static
11768 in global scope.
11770 The same also holds true for deallocation functions. */
11773 {
11775 {
11777 {
11780 }
11782 {
11785 }
11787 {
11792 "%qD is a usual (non-placement) deallocation "
11794 decl);
11795 }
11796 }
11797 }
11800 {
11803 }
11806 else
11807 {
11808 /* An operator function must either be a non-static member function
11809 or have at least one parameter of a class, a reference to a class,
11810 an enumeration, or a reference to an enumeration. 13.4.0.6 */
11812 {
11818 {
11821 }
11822 else
11823 {
11824 tree p;
11827 {
11831 }
11834 {
11839 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
11840 because these checks are performed even on
11841 template functions. */
11845 }
11848 {
11853 }
11854 }
11855 }
11857 /* There are no restrictions on the arguments to an overloaded
11858 "operator ()". */
11862 /* Warn about conversion operators that will never be used. */
11865 && warn_conversion
11866 /* Warn only declaring the function; there is no need to
11867 warn again about out-of-class definitions. */
11869 {
11878 ref
11884 {
11887 ref
11892 /* Don't force t to be complete here. */
11897 ref
11902 }
11904 }
11907 {
11908 /* 13.4.0.3 */
11911 }
11913 {
11916 }
11918 {
11920 /* We pick the one-argument operator codes by default, so
11921 we don't have to change anything. */
11922 ;
11924 {
11925 /* If we thought this was a unary operator, we now know
11926 it to be a binary operator. */
11928 {
11955 }
11961 && ! processing_template_decl
11963 {
11966 decl);
11967 else
11971 }
11972 }
11973 else
11974 {
11977 else
11980 }
11982 /* More Effective C++ rule 6. */
11988 {
11996 {
11999 arg))
12002 }
12003 else
12004 {
12007 }
12008 }
12009 }
12011 {
12013 {
12016 else
12019 }
12020 }
12022 {
12024 {
12027 else
12030 }
12032 /* More Effective C++ rule 7. */
12038 decl);
12039 }
12041 /* Effective C++ rule 23. */
12053 /* [over.oper]/8 */
12057 {
12061 {
12063 decl);
12064 }
12065 else
12066 {
12069 }
12070 }
12071 }
12073 }
12074 \f
12075 /* Return a string giving the keyword associate with CODE. */
12079 {
12081 {
12094 }
12095 }
12097 /* Name lookup in an elaborated-type-specifier (after the keyword
12098 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
12099 elaborated-type-specifier is invalid, issue a diagnostic and return
12100 error_mark_node; otherwise, return the *_TYPE to which it referred.
12101 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
12103 tree
12105 tree decl,
12107 {
12108 tree type;
12110 /* In the case of:
12112 struct S { struct S *p; };
12114 name lookup will find the TYPE_DECL for the implicit "S::S"
12115 typedef. Adjust for that here. */
12121 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
12122 is false for this case as well. */
12124 {
12128 }
12129 /* Accept template template parameters. */
12133 ;
12134 /* [dcl.type.elab]
12136 If the identifier resolves to a typedef-name or the
12137 simple-template-id resolves to an alias template
12138 specialization, the elaborated-type-specifier is ill-formed.
12140 In other words, the only legitimate declaration to use in the
12141 elaborated type specifier is the implicit typedef created when
12142 the type is declared. */
12146 {
12150 else
12155 }
12160 {
12164 }
12167 {
12171 }
12175 {
12176 /* If a class template appears as elaborated type specifier
12177 without a template header such as:
12179 template <class T> class C {};
12180 void f(class C); // No template header here
12182 then the required template argument is missing. */
12187 }
12190 }
12192 /* Lookup NAME in elaborate type specifier in scope according to
12193 SCOPE and issue diagnostics if necessary.
12194 Return *_TYPE node upon success, NULL_TREE when the NAME is not
12195 found, and ERROR_MARK_NODE for type error. */
12197 static tree
12200 {
12201 tree t;
12202 tree decl;
12204 {
12205 /* First try ordinary name lookup, ignoring hidden class name
12206 injected via friend declaration. */
12209 /* If that fails, the name will be placed in the smallest
12210 non-class, non-function-prototype scope according to 3.3.1/5.
12211 We may already have a hidden name declared as friend in this
12212 scope. So lookup again but not ignoring hidden names.
12213 If we find one, that name will be made visible rather than
12214 creating a new tag. */
12217 }
12218 else
12223 /* If scope is ts_current we're defining a class, so ignore a
12224 template template parameter. */
12230 {
12231 /* Look for invalid nested type:
12232 class C {
12233 class C {};
12234 }; */
12236 {
12239 decl);
12241 }
12243 /* Two cases we need to consider when deciding if a class
12244 template is allowed as an elaborated type specifier:
12245 1. It is a self reference to its own class.
12246 2. It comes with a template header.
12248 For example:
12250 template <class T> class C {
12251 class C *c1; // DECL_SELF_REFERENCE_P is true
12252 class D;
12253 };
12254 template <class U> class C; // template_header_p is true
12255 template <class T> class C<T>::D {
12256 class C *c2; // DECL_SELF_REFERENCE_P is true
12257 }; */
12260 decl,
12261 template_header_p
12264 }
12266 {
12270 }
12271 else
12273 }
12275 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
12276 Define the tag as a forward-reference if it is not defined.
12278 If a declaration is given, process it here, and report an error if
12279 multiple declarations are not identical.
12281 SCOPE is TS_CURRENT when this is also a definition. Only look in
12282 the current frame for the name (since C++ allows new names in any
12283 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
12284 declaration. Only look beginning from the current scope outward up
12285 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
12287 TEMPLATE_HEADER_P is true when this declaration is preceded by
12288 a set of template parameters. */
12290 static tree
12293 {
12295 tree t;
12297 tag_scope scope;
12302 {
12315 }
12319 else
12322 /* In case of anonymous name, xref_tag is only called to
12323 make type node and push name. Name lookup is not required. */
12326 else
12336 {
12340 /* Since SCOPE is not TS_CURRENT, we are not looking at a
12341 definition of this tag. Since, in addition, we are currently
12342 processing a (member) template declaration of a template
12343 class, we must be very careful; consider:
12345 template <class X>
12346 struct S1
12348 template <class U>
12349 struct S2
12350 { template <class V>
12351 friend struct S1; };
12353 Here, the S2::S1 declaration should not be confused with the
12354 outer declaration. In particular, the inner version should
12355 have a template parameter of level 2, not level 1. This
12356 would be particularly important if the member declaration
12357 were instead:
12359 template <class V = U> friend struct S1;
12361 say, when we should tsubst into `U' when instantiating
12362 S2. On the other hand, when presented with:
12364 template <class T>
12365 struct S1 {
12366 template <class U>
12367 struct S2 {};
12368 template <class U>
12369 friend struct S2;
12370 };
12372 we must find the inner binding eventually. We
12373 accomplish this by making sure that the new type we
12374 create to represent this declaration has the right
12375 TYPE_CONTEXT. */
12378 }
12381 {
12382 /* If no such tag is yet defined, create a forward-reference node
12383 and record it as the "definition".
12384 When a real declaration of this type is found,
12385 the forward-reference will be altered into a real type. */
12387 {
12390 }
12391 else
12392 {
12396 /* Remember that we're declaring a lambda to avoid bogus errors
12397 in push_template_decl. */
12400 }
12401 }
12402 else
12403 {
12405 {
12408 }
12412 {
12416 }
12418 /* Make injected friend class visible. */
12421 {
12426 {
12429 }
12430 }
12431 }
12434 }
12436 /* Wrapper for xref_tag_1. */
12438 tree
12441 {
12442 tree ret;
12448 }
12451 tree
12453 {
12458 else
12465 }
12467 /* Create the binfo hierarchy for REF with (possibly NULL) base list
12468 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
12469 access_* node, and the TREE_VALUE is the type of the base-class.
12470 Non-NULL TREE_TYPE indicates virtual inheritance.
12472 Returns true if the binfo hierarchy was successfully created,
12473 false if an error was detected. */
12475 bool
12477 {
12483 tree default_access;
12489 /* The base of a derived class is private by default, all others are
12490 public. */
12495 /* First, make sure that any templates in base-classes are
12496 instantiated. This ensures that if we call ourselves recursively
12497 we do not get confused about which classes are marked and which
12498 are not. */
12501 {
12504 /* The dependent_type_p call below should really be dependent_scope_p
12505 so that we give a hard error about using an incomplete type as a
12506 base, but we allow it with a pedwarn for backward
12507 compatibility. */
12513 /* An incomplete type. Remove it from the list. */
12515 else
12516 {
12517 max_bases++;
12519 max_vbases++;
12523 }
12524 }
12528 /* The binfo slot should be empty, unless this is an (ill-formed)
12529 redefinition. */
12531 {
12534 }
12544 /* Apply base-class info set up to the variants of this type. */
12548 {
12550 /* An aggregate cannot have baseclasses. */
12554 {
12557 }
12558 }
12561 {
12563 {
12566 }
12567 }
12570 {
12574 {
12577 }
12578 }
12581 {
12594 {
12596 basetype);
12598 }
12605 {
12607 /* The original basetype could have been a typedef'd type. */
12610 /* Inherit flags from the base. */
12621 }
12623 /* We must do this test after we've seen through a typedef
12624 type. */
12626 {
12629 else
12632 }
12635 /* Regenerate the pack expansion for the bases. */
12647 }
12650 /* If we didn't get max_vbases vbases, we must have shared at
12651 least one of them, and are therefore diamond shaped. */
12654 /* Unmark all the types. */
12659 /* Now see if we have a repeated base type. */
12661 {
12664 {
12666 {
12669 }
12671 }
12676 else
12678 }
12681 }
12683 \f
12684 /* Copies the enum-related properties from type SRC to type DST.
12685 Used with the underlying type of an enum and the enum itself. */
12686 static void
12688 {
12689 tree t;
12691 {
12701 }
12702 }
12704 /* Begin compiling the definition of an enumeration type.
12705 NAME is its name,
12707 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
12709 UNDERLYING_TYPE is the type that will be used as the storage for
12710 the enumeration type. This should be NULL_TREE if no storage type
12711 was specified.
12713 SCOPED_ENUM_P is true if this is a scoped enumeration type.
12715 if IS_NEW is not NULL, gets TRUE iff a new type is created.
12717 Returns the type object, as yet incomplete.
12718 Also records info about it so that build_enumerator
12719 may be used to declare the individual values as they are read. */
12721 tree
12724 {
12730 /* [C++0x dcl.enum]p5:
12732 If not explicitly specified, the underlying type of a scoped
12733 enumeration type is int. */
12740 /* If this is the real definition for a previous forward reference,
12741 fill in the contents in the same object that used to be the
12742 forward reference. */
12748 /* In case of a template_decl, the only check that should be deferred
12749 to instantiation time is the comparison of underlying types. */
12751 {
12753 {
12759 }
12761 {
12767 }
12773 {
12779 }
12780 }
12784 {
12785 /* In case of error, make a dummy enum to allow parsing to
12786 continue. */
12788 {
12791 }
12793 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
12794 of an opaque enum, or an opaque enum of an already defined
12795 enumeration (C++0x only).
12796 In any other case, it'll be NULL_TREE. */
12798 {
12801 }
12804 /* Do not push the decl more than once, unless we need to
12805 compare underlying types at instantiation time */
12808 || (underlying_type
12812 {
12815 }
12816 else
12823 /* The enum is considered opaque until the opening '{' of the
12824 enumerator list. */
12827 }
12832 {
12834 {
12837 }
12840 else
12843 }
12845 /* If into a template class, the returned enum is always the first
12846 declaration (opaque or not) seen. This way all the references to
12847 this type will be to the same declaration. The following ones are used
12848 only to check for definition errors. */
12851 else
12853 }
12855 /* After processing and defining all the values of an enumeration type,
12856 install their decls in the enumeration type.
12857 ENUMTYPE is the type object. */
12859 void
12861 {
12862 tree values;
12863 tree underlying_type;
12864 tree decl;
12865 tree value;
12867 tree t;
12869 bool fixed_underlying_type_p
12872 /* We built up the VALUES in reverse order. */
12875 /* For an enum defined in a template, just set the type of the values;
12876 all further processing is postponed until the template is
12877 instantiated. We need to set the type so that tsubst of a CONST_DECL
12878 works. */
12880 {
12882 values;
12886 }
12888 /* Determine the minimum and maximum values of the enumerators. */
12890 {
12894 values;
12896 {
12899 /* [dcl.enum]: Following the closing brace of an enum-specifier,
12900 each enumerator has the type of its enumeration. Prior to the
12901 closing brace, the type of each enumerator is the type of its
12902 initializing value. */
12905 /* Update the minimum and maximum values, if appropriate. */
12909 /* Figure out what the minimum and maximum values of the
12910 enumerators are. */
12917 }
12918 }
12919 else
12920 /* [dcl.enum]
12922 If the enumerator-list is empty, the underlying type is as if
12923 the enumeration had a single enumerator with value 0. */
12927 {
12928 /* Compute the number of bits require to represent all values of the
12929 enumeration. We must do this before the type of MINNODE and
12930 MAXNODE are transformed, since tree_int_cst_min_precision relies
12931 on the TREE_TYPE of the value it is passed. */
12939 /* Determine the underlying type of the enumeration.
12941 [dcl.enum]
12943 The underlying type of an enumeration is an integral type that
12944 can represent all the enumerator values defined in the
12945 enumeration. It is implementation-defined which integral type is
12946 used as the underlying type for an enumeration except that the
12947 underlying type shall not be larger than int unless the value of
12948 an enumerator cannot fit in an int or unsigned int.
12950 We use "int" or an "unsigned int" as the underlying type, even if
12951 a smaller integral type would work, unless the user has
12952 explicitly requested that we use the smallest possible type. The
12953 user can request that for all enumerations with a command line
12954 flag, or for just one enumeration with an attribute. */
12956 use_short_enum = flag_short_enums
12961 itk++)
12962 {
12968 }
12970 {
12971 /* DR 377
12973 IF no integral type can represent all the enumerator values, the
12974 enumeration is ill-formed. */
12979 }
12981 /* [dcl.enum]
12983 The value of sizeof() applied to an enumeration type, an object
12984 of an enumeration type, or an enumerator, is the value of sizeof()
12985 applied to the underlying type. */
12988 /* Compute the minimum and maximum values for the type.
12990 [dcl.enum]
12992 For an enumeration where emin is the smallest enumerator and emax
12993 is the largest, the values of the enumeration are the values of the
12994 underlying type in the range bmin to bmax, where bmin and bmax are,
12995 respectively, the smallest and largest values of the smallest bit-
12996 field that can store emin and emax. */
12998 /* The middle-end currently assumes that types with TYPE_PRECISION
12999 narrower than their underlying type are suitably zero or sign
13000 extended to fill their mode. Similarly, it assumes that the front
13001 end assures that a value of a particular type must be within
13002 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
13004 We used to set these fields based on bmin and bmax, but that led
13005 to invalid assumptions like optimizing away bounds checking. So
13006 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
13007 TYPE_MAX_VALUE to the values for the mode above and only restrict
13008 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
13012 set_min_and_max_values_for_integral_type
13015 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
13018 }
13019 else
13022 /* Convert each of the enumerators to the type of the underlying
13023 type of the enumeration. */
13025 {
13026 location_t saved_location;
13032 /* If the enumeration type has a fixed underlying type, we
13033 already checked all of the enumerator values. */
13035 else
13038 tf_warning_or_error);
13041 /* Do not clobber shared ints. */
13046 }
13048 /* Fix up all variant types of this enum type. */
13056 current_class_type);
13058 /* Finish debugging output for this type. */
13060 }
13062 /* Finishes the enum type. This is called only the first time an
13063 enumeration is seen, be it opaque or odinary.
13064 ENUMTYPE is the type object. */
13066 void
13068 {
13070 {
13074 }
13076 /* If this is a forward declaration, there should not be any variants,
13077 though we can get a variant in the middle of an enum-specifier with
13078 wacky code like 'enum E { e = sizeof(const E*) };' */
13082 }
13084 /* Build and install a CONST_DECL for an enumeration constant of the
13085 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
13086 LOC is the location of NAME.
13087 Assignment of sequential values by default is handled here. */
13089 void
13091 {
13092 tree decl;
13093 tree context;
13094 tree type;
13096 /* scalar_constant_value will pull out this expression, so make sure
13097 it's folded as appropriate. */
13101 /* If the VALUE was erroneous, pretend it wasn't there; that will
13102 result in the enum being assigned the next value in sequence. */
13106 /* Remove no-op casts from the value. */
13111 {
13112 /* Validate and default VALUE. */
13114 {
13116 {
13121 }
13123 value = perform_implicit_conversion_flags
13131 {
13136 {
13138 name);
13140 }
13141 }
13142 }
13144 /* Default based on previous value. */
13146 {
13148 {
13149 tree prev_value;
13152 /* C++03 7.2/4: If no initializer is specified for the first
13153 enumerator, the type is an unspecified integral
13154 type. Otherwise the type is the same as the type of the
13155 initializing value of the preceding enumerator unless the
13156 incremented value is not representable in that type, in
13157 which case the type is an unspecified integral type
13158 sufficient to contain the incremented value. */
13162 else
13163 {
13169 {
13172 {
13175 {
13181 }
13187 }
13190 else
13192 }
13195 {
13198 }
13199 }
13200 }
13201 else
13203 }
13205 /* Remove no-op casts from the value. */
13208 /* If the underlying type of the enum is fixed, check whether
13209 the enumerator values fits in the underlying type. If it
13210 does not fit, the program is ill-formed [C++0x dcl.enum]. */
13212 && value
13214 {
13219 /* Convert the value to the appropriate type. */
13221 }
13222 }
13224 /* C++ associates enums with global, function, or class declarations. */
13227 /* Build the actual enumeration constant. Note that the enumeration
13228 constants have the underlying type of the enum (if it is fixed)
13229 or the type of their initializer (if the underlying type of the
13230 enum is not fixed):
13232 [ C++0x dcl.enum ]
13234 If the underlying type is fixed, the type of each enumerator
13235 prior to the closing brace is the underlying type; if the
13236 initializing value of an enumerator cannot be represented by
13237 the underlying type, the program is ill-formed. If the
13238 underlying type is not fixed, the type of each enumerator is
13239 the type of its initializing value.
13241 If the underlying type is not fixed, it will be computed by
13242 finish_enum and we will reset the type of this enumerator. Of
13243 course, if we're processing a template, there may be no value. */
13254 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
13255 on the TYPE_FIELDS list for `S'. (That's so that you can say
13256 things like `S::i' later.) */
13258 else
13261 /* Add this enumeration constant to the list for this type. */
13263 }
13265 /* Look for an enumerator with the given NAME within the enumeration
13266 type ENUMTYPE. This routine is used primarily for qualified name
13267 lookup into an enumerator in C++0x, e.g.,
13269 enum class Color { Red, Green, Blue };
13271 Color color = Color::Red;
13273 Returns the value corresponding to the enumerator, or
13274 NULL_TREE if no such enumerator was found. */
13275 tree
13277 {
13278 tree e;
13283 }
13285 \f
13286 /* We're defining DECL. Make sure that its type is OK. */
13288 static void
13290 {
13294 /* In a function definition, arg types must be complete. */
13302 {
13307 else
13310 /* Make it return void instead. */
13313 void_type_node,
13315 else
13317 fntype
13320 fntype = (cp_build_type_attribute_variant
13323 }
13324 else
13326 }
13328 /* Create the FUNCTION_DECL for a function definition.
13329 DECLSPECS and DECLARATOR are the parts of the declaration;
13330 they describe the function's name and the type it returns,
13331 but twisted together in a fashion that parallels the syntax of C.
13333 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
13334 DECLARATOR is really the DECL for the function we are about to
13335 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
13336 indicating that the function is an inline defined in-class.
13338 This function creates a binding context for the function body
13339 as well as setting up the FUNCTION_DECL in current_function_decl.
13341 For C++, we must first check whether that datum makes any sense.
13342 For example, "class A local_a(1,2);" means that variable local_a
13343 is an aggregate of type A, which should have a constructor
13344 applied to it with the argument list [1, 2].
13346 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
13347 or may be a BLOCK if the function has been defined previously
13348 in this translation unit. On exit, DECL_INITIAL (decl1) will be
13349 error_mark_node if the function has never been defined, or
13350 a BLOCK if the function has been defined somewhere. */
13352 bool
13354 {
13356 tree fntype;
13357 tree restype;
13360 tree current_function_parms;
13365 /* Sanity check. */
13373 /* ISO C++ 11.4/5. A friend function defined in a class is in
13374 the (lexical) scope of the class in which it is defined. */
13376 {
13379 /* CTYPE could be null here if we're dealing with a template;
13380 for example, `inline friend float foo()' inside a template
13381 will have no CTYPE set. */
13384 else
13386 }
13392 /* Handle gnu_inline attribute. */
13394 {
13399 }
13402 /* This is a constructor, we must ensure that any default args
13403 introduced by this definition are propagated to the clones
13404 now. The clones are used directly in overload resolution. */
13407 /* Sometimes we don't notice that a function is a static member, and
13408 build a METHOD_TYPE for it. Fix that up now. */
13412 /* Set up current_class_type, and enter the scope of the class, if
13413 appropriate. */
13419 /* Now that we have entered the scope of the class, we must restore
13420 the bindings for any template parameters surrounding DECL1, if it
13421 is an inline member template. (Order is important; consider the
13422 case where a template parameter has the same name as a field of
13423 the class.) It is not until after this point that
13424 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
13428 /* Effective C++ rule 15. */
13434 /* Make the init_value nonzero so pushdecl knows this is not tentative.
13435 error_mark_node is replaced below (in poplevel) with the BLOCK. */
13439 /* This function exists in static storage.
13440 (This does not mean `static' in the C sense!) */
13443 /* We must call push_template_decl after current_class_type is set
13444 up. (If we are processing inline definitions after exiting a
13445 class scope, current_class_type will be NULL_TREE until set above
13446 by push_nested_class.) */
13448 {
13451 {
13455 }
13457 }
13459 /* We are now in the scope of the function being defined. */
13462 /* Save the parm names or decls from this function's declarator
13463 where store_parm_decls will find them. */
13466 /* Make sure the parameter and return types are reasonable. When
13467 you declare a function, these types can be incomplete, but they
13468 must be complete when you define the function. */
13471 /* Build the return declaration for the function. */
13475 {
13476 tree resdecl;
13484 }
13486 /* Let the user know we're compiling this function. */
13489 /* Record the decl so that the function name is defined.
13490 If we already have a decl for this name, and it is a FUNCTION_DECL,
13491 use the old decl. */
13493 {
13494 /* A specialization is not used to guide overload resolution. */
13498 {
13502 /* If something went wrong when registering the declaration,
13503 use DECL1; we have to have a FUNCTION_DECL to use when
13504 parsing the body of the function. */
13505 ;
13506 else
13507 {
13508 /* Otherwise, OLDDECL is either a previous declaration
13509 of the same function or DECL1 itself. */
13516 {
13517 tree context;
13519 /* Check whether DECL1 is in an anonymous
13520 namespace. */
13522 context;
13524 {
13528 }
13533 }
13536 }
13537 }
13538 else
13539 {
13540 /* We need to set the DECL_CONTEXT. */
13543 }
13547 /* If #pragma weak applies, mark the decl appropriately now.
13548 The pragma only applies to global functions. Because
13549 determining whether or not the #pragma applies involves
13550 computing the mangled name for the declaration, we cannot
13551 apply the pragma until after we have merged this declaration
13552 with any previous declarations; if the original declaration
13553 has a linkage specification, that specification applies to
13554 the definition as well, and may affect the mangled name. */
13557 }
13559 /* Reset this in case the call to pushdecl changed it. */
13564 /* This function may already have been parsed, in which case just
13565 return; our caller will skip over the body without parsing. */
13569 /* Initialize RTL machinery. We cannot do this until
13570 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
13571 even when processing a template; this is how we get
13572 CFUN set up, and our per-function variables initialized.
13573 FIXME factor out the non-RTL stuff. */
13577 /* Initialize the language data structures. Whenever we start
13578 a new function, we destroy temporaries in the usual way. */
13584 {
13587 }
13589 /* Start the statement-tree, start the tree now. */
13592 /* If we are (erroneously) defining a function that we have already
13593 defined before, wipe out what we knew before. */
13598 {
13599 /* We know that this was set up by `grokclassfn'. We do not
13600 wait until `store_parm_decls', since evil parse errors may
13601 never get us to that point. Here we keep the consistency
13602 between `current_class_type' and `current_class_ptr'. */
13608 cp_function_chain->x_current_class_ref
13610 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
13613 /* Constructors and destructors need to know whether they're "in
13614 charge" of initializing virtual base classes. */
13617 {
13620 }
13622 {
13625 }
13626 }
13629 /* Implicitly-defined methods (like the
13630 destructor for a class in which no destructor
13631 is explicitly declared) must not be defined
13632 until their definition is needed. So, we
13633 ignore interface specifications for
13634 compiler-generated functions. */
13640 {
13647 /* This is a function in a local class in an extern inline
13648 or template function. */
13650 }
13651 /* If this function belongs to an interface, it is public.
13652 If it belongs to someone else's interface, it is also external.
13653 This only affects inlines and template instantiations. */
13655 {
13658 {
13662 && ! flag_implement_inlines
13665 /* For WIN32 we also want to put these in linkonce sections. */
13667 }
13668 else
13671 /* If this function is in an interface implemented in this file,
13672 make sure that the back end knows to emit this function
13673 here. */
13676 }
13679 {
13680 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
13681 interface, we will have both finfo->interface_unknown and
13682 finfo->interface_only set. In that case, we don't want to
13683 use the normal heuristics because someone will supply a
13684 #pragma implementation elsewhere, and deducing it here would
13685 produce a conflict. */
13690 }
13691 else
13692 {
13693 /* This is a definition, not a reference.
13694 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
13702 else
13704 }
13706 /* Determine the ELF visibility attribute for the function. We must not
13707 do this before calling "pushdecl", as we must allow "duplicate_decls"
13708 to merge any attributes appropriately. We also need to wait until
13709 linkage is set. */
13723 {
13725 }
13732 }
13735 /* Like start_preparsed_function, except that instead of a
13736 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
13738 Returns true on success. If the DECLARATOR is not suitable
13739 for a function, we return false, which tells the parser to
13740 skip the entire function. */
13742 bool
13745 tree attrs)
13746 {
13747 tree decl1;
13752 /* If the declarator is not suitable for a function definition,
13753 cause a syntax error. */
13755 {
13758 }
13761 /* main must return int. grokfndecl should have corrected it
13762 (and issued a diagnostic) if the user got it wrong. */
13764 integer_type_node));
13767 }
13768 \f
13769 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
13770 FN. */
13772 static bool
13774 {
13776 && !processing_template_decl
13778 /* We insert the EH_SPEC_BLOCK only in the original
13779 function; then, it is copied automatically to the
13780 clones. */
13782 /* Implicitly-generated constructors and destructors have
13783 exception specifications. However, those specifications
13784 are the union of the possible exceptions specified by the
13785 constructors/destructors for bases and members, so no
13786 unallowed exception will ever reach this function. By
13787 not creating the EH_SPEC_BLOCK we save a little memory,
13788 and we avoid spurious warnings about unreachable
13789 code. */
13791 }
13793 /* Store the parameter declarations into the current function declaration.
13794 This is called after parsing the parameter declarations, before
13795 digesting the body of the function.
13797 Also install to binding contour return value identifier, if any. */
13799 static void
13801 {
13803 tree parm;
13805 /* This is a chain of any other decls that came in among the parm
13806 declarations. If a parm is declared with enum {foo, bar} x;
13807 then CONST_DECLs for foo and bar are put here. */
13811 {
13812 /* This case is when the function was defined with an ANSI prototype.
13813 The parms already have decls, so we need not do anything here
13814 except record them as in effect
13815 and complain if any redundant old-style parm decls were written. */
13818 tree next;
13820 /* Must clear this because it might contain TYPE_DECLs declared
13821 at class level. */
13824 /* If we're doing semantic analysis, then we'll call pushdecl
13825 for each of these. We must do them in reverse order so that
13826 they end in the correct forward order. */
13830 {
13833 {
13837 else
13839 }
13840 else
13841 {
13842 /* If we find an enum constant or a type tag,
13843 put it aside for the moment. */
13846 }
13847 }
13849 /* Get the decls in their original chain order and record in the
13850 function. This is all and only the PARM_DECLs that were
13851 pushed into scope by the loop above. */
13853 }
13854 else
13857 /* Now store the final chain of decls for the arguments
13858 as the decl-chain of the current lexical scope.
13859 Put the enumerators in as well, at the front so that
13860 DECL_ARGUMENTS is not modified. */
13865 }
13867 \f
13868 /* We have finished doing semantic analysis on DECL, but have not yet
13869 generated RTL for its body. Save away our current state, so that
13870 when we want to generate RTL later we know what to do. */
13872 static void
13874 {
13877 /* Save the language-specific per-function data so that we can
13878 get it back when we really expand this function. */
13881 /* Make a copy. */
13886 /* Clear out the bits we don't need. */
13891 }
13894 /* Set the return value of the constructor (if present). */
13896 static void
13898 {
13899 tree val;
13900 tree exprstmt;
13904 {
13905 /* Any return from a constructor will end up here. */
13911 /* Return the address of the object. */
13914 }
13915 }
13917 /* Do all the processing for the beginning of a destructor; set up the
13918 vtable pointers and cleanups for bases and members. */
13920 static void
13922 {
13923 tree compound_stmt;
13925 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
13926 issued an error message. We still want to try to process the
13927 body of the function, but initialize_vtbl_ptrs will crash if
13928 TYPE_BINFO is NULL. */
13930 {
13932 /* Make all virtual function table pointers in non-virtual base
13933 classes point to CURRENT_CLASS_TYPE's virtual function
13934 tables. */
13939 {
13940 /* Insert a cleanup to let the back end know that the object is dead
13941 when we exit the destructor, either normally or via exception. */
13946 current_class_ptr);
13950 }
13952 /* And insert cleanups for our bases and members so that they
13953 will be properly destroyed if we throw. */
13955 }
13956 }
13958 /* At the end of every destructor we generate code to delete the object if
13959 necessary. Do that now. */
13961 static void
13963 {
13964 tree exprstmt;
13966 /* Any return from a destructor will end up here; that way all base
13967 and member cleanups will be run when the function returns. */
13970 /* In a virtual destructor, we must call delete. */
13972 {
13973 tree if_stmt;
13976 /* [class.dtor]
13978 At the point of definition of a virtual destructor (including
13979 an implicit definition), non-placement operator delete shall
13980 be looked up in the scope of the destructor's class and if
13981 found shall be accessible and unambiguous. */
13983 virtual_size,
13987 tf_warning_or_error);
13991 current_in_charge_parm,
13992 integer_one_node),
13993 if_stmt);
13997 }
14000 {
14001 tree val;
14006 /* Return the address of the object. */
14009 }
14010 }
14012 /* Do the necessary processing for the beginning of a function body, which
14013 in this case includes member-initializers, but not the catch clauses of
14014 a function-try-block. Currently, this means opening a binding level
14015 for the member-initializers (in a ctor), member cleanups (in a dtor),
14016 and capture proxies (in a lambda operator()). */
14018 tree
14020 {
14021 tree stmt;
14028 else
14029 /* Always keep the BLOCK node associated with the outermost pair of
14030 curly braces of a function. These are needed for correct
14031 operation of dwarfout.c. */
14042 }
14044 /* Do the processing for the end of a function body. Currently, this means
14045 closing out the cleanups for fully-constructed bases and members, and in
14046 the case of the destructor, deleting the object if desired. Again, this
14047 is only meaningful for [cd]tors, since they are the only functions where
14048 there is a significant distinction between the main body and any
14049 function catch clauses. Handling, say, main() return semantics here
14050 would be wrong, as flowing off the end of a function catch clause for
14051 main() would also need to return 0. */
14053 void
14055 {
14059 /* Close the block. */
14068 }
14070 /* Given a function, returns the BLOCK corresponding to the outermost level
14071 of curly braces, skipping the artificial block created for constructor
14072 initializers. */
14074 tree
14076 {
14086 }
14088 /* If FNDECL is a class's key method, add the class to the list of
14089 keyed classes that should be emitted. */
14091 static void
14093 {
14097 {
14101 }
14102 }
14104 /* Subroutine of finish_function.
14105 Save the body of constexpr functions for possible
14106 future compile time evaluation. */
14108 static void
14110 {
14116 }
14118 /* Finish up a function declaration and compile that function
14119 all the way to assembler language output. The free the storage
14120 for the function definition.
14122 FLAGS is a bitwise or of the following values:
14123 2 - INCLASS_INLINE
14124 We just finished processing the body of an in-class inline
14125 function definition. (This processing will have taken place
14126 after the class definition is complete.) */
14128 tree
14130 {
14135 /* When we get some parse errors, we can end up without a
14136 current_function_decl, so cope. */
14150 /* TREE_READONLY (fndecl) = 1;
14151 This caused &foo to be of type ptr-to-const-function
14152 which then got a warning when stored in a ptr-to-function variable. */
14155 /* The current function is being defined, so its DECL_INITIAL should
14156 be set, and unless there's a multiple definition, it should be
14157 error_mark_node. */
14160 /* For a cloned function, we've already got all the code we need;
14161 there's no need to add any extra bits. */
14163 {
14164 /* Make it so that `main' always returns 0 by default. */
14171 current_eh_spec_block);
14172 }
14174 /* If we're saving up tree structure, tie off the function now. */
14182 /* If this function can't throw any exceptions, remember that. */
14185 && !flag_non_call_exceptions
14189 /* This must come after expand_function_end because cleanups might
14190 have declarations (from inline functions) that need to go into
14191 this function's blocks. */
14193 /* If the current binding level isn't the outermost binding level
14194 for this function, either there is a bug, or we have experienced
14195 syntax errors and the statement tree is malformed. */
14197 {
14198 /* Make sure we have already experienced errors. */
14201 /* Throw away the broken statement tree and extra binding
14202 levels. */
14206 {
14209 else
14211 }
14212 }
14215 /* Statements should always be full-expressions at the outermost set
14216 of curly braces for a function. */
14219 /* If there are no return statements in a function with auto return type,
14220 the return type is void. But if the declared type is something like
14221 auto*, this is an error. */
14224 {
14227 {
14229 current_function_auto_return_pattern);
14232 }
14235 }
14237 /* Save constexpr function body before it gets munged by
14238 the NRV transformation. */
14241 /* Set up the named return value optimization, if we can. Candidate
14242 variables are selected in check_return_expr. */
14244 {
14246 tree outer;
14249 /* This is only worth doing for fns that return in memory--and
14250 simpler, since we don't have to worry about promoted modes. */
14252 /* Only allow this for variables declared in the outer scope of
14253 the function so we know that their lifetime always ends with a
14254 return; see g++.dg/opt/nrv6.C. We could be more flexible if
14255 we were to do this optimization in tree-ssa. */
14261 }
14263 /* Remember that we were in class scope. */
14267 /* Must mark the RESULT_DECL as being in this function. */
14270 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
14271 to the FUNCTION_DECL node itself. */
14274 /* Save away current state, if appropriate. */
14278 /* Complain if there's just no return statement. */
14283 /* Don't complain if we abort or throw. */
14284 && !current_function_returns_abnormally
14285 /* Don't complain if there's an infinite loop. */
14286 && !current_function_infinite_loop
14287 /* Don't complain if we are declared noreturn. */
14291 /* Structor return values (if any) are set by the compiler. */
14295 {
14299 }
14301 /* Store the end of the function, so that we get good line number
14302 info for the epilogue. */
14305 /* Complain about parameters that are only set, but never otherwise used. */
14307 && !processing_template_decl
14310 {
14311 tree decl;
14314 decl;
14330 }
14332 /* Complain about locally defined typedefs that are not used in this
14333 function. */
14336 /* Genericize before inlining. */
14338 {
14342 /* Clear out the bits we don't need. */
14352 }
14353 /* Clear out the bits we don't need. */
14356 /* We're leaving the context of this function, so zap cfun. It's still in
14357 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
14361 /* If this is an in-class inline definition, we may have to pop the
14362 bindings for the template parameters that we added in
14363 maybe_begin_member_template_processing when start_function was
14364 called. */
14368 /* Leave the scope of the class. */
14374 /* Clean up. */
14379 {
14381 tree decl;
14386 }
14389 }
14390 \f
14391 /* Create the FUNCTION_DECL for a function definition.
14392 DECLSPECS and DECLARATOR are the parts of the declaration;
14393 they describe the return type and the name of the function,
14394 but twisted together in a fashion that parallels the syntax of C.
14396 This function creates a binding context for the function body
14397 as well as setting up the FUNCTION_DECL in current_function_decl.
14399 Returns a FUNCTION_DECL on success.
14401 If the DECLARATOR is not suitable for a function (it defines a datum
14402 instead), we return 0, which tells yyparse to report a parse error.
14404 May return void_type_node indicating that this method is actually
14405 a friend. See grokfield for more details.
14407 Came here with a `.pushlevel' .
14409 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
14410 CHANGES TO CODE IN `grokfield'. */
14412 tree
14415 {
14423 {
14426 }
14431 /* Pass friends other than inline friend functions back. */
14436 {
14441 }
14449 /* We process method specializations in finish_struct_1. */
14451 {
14455 }
14458 {
14460 {
14463 }
14464 }
14470 }
14471 \f
14473 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
14474 we can lay it out later, when and if its type becomes complete.
14476 Also handle constexpr variables where the initializer involves
14477 an unlowered PTRMEM_CST because the class isn't complete yet. */
14479 void
14481 {
14484 /* Keep track of variables with incomplete types. */
14487 {
14495 /* RTTI TD entries are created while defining the type_info. */
14498 {
14501 }
14505 {
14506 /* When the outermost open class is complete we can resolve any
14507 pointers-to-members. */
14511 }
14512 }
14513 }
14515 /* Called when a class type (given by TYPE) is defined. If there are
14516 any existing VAR_DECLs whose type has been completed by this
14517 declaration, update them now. */
14519 void
14521 {
14526 {
14528 {
14534 {
14535 /* Complete the type of the variable. The VAR_DECL itself
14536 will be laid out in expand_expr. */
14539 }
14545 /* Remove this entry from the list. */
14547 }
14548 else
14549 ix++;
14550 }
14552 /* Check for pending declarations which may have abstract type. */
14554 }
14556 /* If DECL is of a type which needs a cleanup, build and return an
14557 expression to perform that cleanup here. Return NULL_TREE if no
14558 cleanup need be done. */
14560 tree
14562 {
14563 tree type;
14564 tree attr;
14565 tree cleanup;
14567 /* Assume no cleanup is required. */
14573 /* Handle "__attribute__((cleanup))". We run the cleanup function
14574 before the destructor since the destructor is what actually
14575 terminates the lifetime of the object. */
14578 {
14579 tree id;
14580 tree fn;
14581 tree arg;
14583 /* Get the name specified by the user for the cleanup function. */
14585 /* Look up the name to find the cleanup function to call. It is
14586 important to use lookup_name here because that is what is
14587 used in c-common.c:handle_cleanup_attribute when performing
14588 initial checks on the attribute. Note that those checks
14589 include ensuring that the function found is not an overloaded
14590 function, or an object with an overloaded call operator,
14591 etc.; we can rely on the fact that the function found is an
14592 ordinary FUNCTION_DECL. */
14599 }
14600 /* Handle ordinary C++ destructors. */
14603 {
14605 tree addr;
14606 tree call;
14610 else
14621 else
14623 }
14625 /* build_delete sets the location of the destructor call to the
14626 current location, even though the destructor is going to be
14627 called later, at the end of the current scope. This can lead to
14628 a "jumpy" behaviour for users of debuggers when they step around
14629 the end of the block. So let's unset the location of the
14630 destructor call instead. */
14636 /* Treat objects with destructors as used; the destructor may do
14637 something substantive. */
14641 }
14643 \f
14644 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
14645 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
14646 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
14648 tree
14650 {
14651 tree fntype;
14652 tree args;
14666 fntype = (cp_build_type_attribute_variant
14668 fntype = (build_exception_variant
14673 }
14675 /* DECL was originally constructed as a non-static member function,
14676 but turned out to be static. Update it accordingly. */
14678 void
14680 {
14693 }
14695 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
14696 one of the language-independent trees. */
14698 enum cp_tree_node_structure_enum
14700 {
14702 {
14718 }
14719 }
14721 /* Build the void_list_node (void_type_node having been created). */
14722 tree
14724 {
14727 }
14729 bool
14731 {
14732 /* A missing noreturn is ok for the `main' function. */
14734 }
14736 /* Return the decl used to identify the COMDAT group into which DECL should
14737 be placed. */
14739 tree
14741 {
14742 /* Virtual tables, construction virtual tables, and virtual table
14743 tables all go in a single COMDAT group, named after the primary
14744 virtual table. */
14747 /* For all other DECLs, the COMDAT group is the mangled name of the
14748 declaration itself. */
14749 else
14750 {
14752 {
14753 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
14754 into the same section as the target function. In that case
14755 we must return target's name. */
14761 else
14763 }
14764 }
14767 }
14769 /* Returns the return type for FN as written by the user, which may include
14770 a placeholder for a deduced return type. */
14772 tree
14774 {
14777 {
14784 }
14786 }
14788 /* Returns true iff DECL was declared with an auto return type and it has
14789 not yet been deduced to a real type. */
14791 bool
14793 {
14797 }
14799 /* Complain if DECL has an undeduced return type. */
14801 void
14803 {
14806 }