| blob | 3e7316f3e0b739df02354e025769ad68eb1da8f6 |
1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988-2017 Free Software Foundation, Inc.
3 Contributed by Michael Tiemann (tiemann@cygnus.com)
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
10 any later version.
12 GCC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
22 /* Process declarations and symbol lookup for C++ front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
55 /* Possible cases of bad specifiers type used by bad_specifiers. */
60 BSP_FIELD /* field */
61 };
100 static tree check_special_function_return_type
108 /* The following symbols are subsumed in the cp_global_trees array, and
109 listed here individually for documentation purposes.
111 C++ extensions
112 tree wchar_decl_node;
114 tree vtable_entry_type;
115 tree delta_type_node;
116 tree __t_desc_type_node;
118 tree class_type_node;
119 tree unknown_type_node;
121 Array type `vtable_entry_type[]'
123 tree vtbl_type_node;
124 tree vtbl_ptr_type_node;
126 Namespaces,
128 tree std_node;
129 tree abi_node;
131 A FUNCTION_DECL which can call `abort'. Not necessarily the
132 one that the user will declare, but sufficient to be called
133 by routines that want to abort the program.
135 tree abort_fndecl;
137 Used by RTTI
138 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
139 tree tinfo_var_id; */
143 /* Indicates that there is a type value in some namespace, although
144 that is not necessarily in scope at the moment. */
146 tree global_type_node;
148 /* The node that holds the "name" of the global scope. */
149 tree global_scope_name;
151 #define local_names cp_function_chain->x_local_names
153 /* A list of objects which have constructors or destructors
154 which reside in the global scope. The decl is stored in
155 the TREE_VALUE slot and the initializer is stored
156 in the TREE_PURPOSE slot. */
157 tree static_aggregates;
159 /* Like static_aggregates, but for thread_local variables. */
160 tree tls_aggregates;
162 /* -- end of C++ */
164 /* A node for the integer constant 2. */
166 tree integer_two_node;
168 /* Used only for jumps to as-yet undefined labels, since jumps to
169 defined labels can have their validity checked immediately. */
173 /* The binding level to which this entry is *currently* attached.
174 This is initially the binding level in which the goto appeared,
175 but is modified as scopes are closed. */
177 /* The head of the names list that was current when the goto appeared,
178 or the inner scope popped. These are the decls that will *not* be
179 skipped when jumping to the label. */
180 tree names_in_scope;
181 /* The location of the goto, for error reporting. */
182 location_t o_goto_locus;
183 /* True if an OpenMP structured block scope has been closed since
184 the goto appeared. This means that the branch from the label will
185 illegally exit an OpenMP scope. */
187 };
189 /* A list of all LABEL_DECLs in the function that have names. Here so
190 we can clear out their names' definitions at the end of the
191 function, and so we can check the validity of jumps to these labels. */
194 /* The decl itself. */
195 tree label_decl;
197 /* The binding level to which the label is *currently* attached.
198 This is initially set to the binding level in which the label
199 is defined, but is modified as scopes are closed. */
201 /* The head of the names list that was current when the label was
202 defined, or the inner scope popped. These are the decls that will
203 be skipped when jumping to the label. */
204 tree names_in_scope;
205 /* A vector of all decls from all binding levels that would be
206 crossed by a backward branch to the label. */
209 /* A list of uses of the label, before the label is defined. */
212 /* The following bits are set after the label is defined, and are
213 updated as scopes are popped. They indicate that a backward jump
214 to the label will illegally enter a scope of the given flavor. */
220 };
222 #define named_labels cp_function_chain->x_named_labels
223 \f
224 /* The number of function bodies which we are currently processing.
225 (Zero if we are at namespace scope, one inside the body of a
226 function, two inside the body of a function in a local class, etc.) */
229 /* Whether the exception-specifier is part of a function type (i.e. C++17). */
232 /* States indicating how grokdeclarator() should handle declspecs marked
233 with __attribute__((deprecated)). An object declared as
234 __attribute__((deprecated)) suppresses warnings of uses of other
235 deprecated items. */
238 \f
239 /* A list of VAR_DECLs whose type was incomplete at the time the
240 variable was declared. */
243 tree decl;
244 tree incomplete_type;
245 };
249 \f
250 /* Returns the kind of template specialization we are currently
251 processing, given that it's declaration contained N_CLASS_SCOPES
252 explicit scope qualifications. */
254 tmpl_spec_kind
256 {
262 /* Scan through the template parameter scopes. */
266 {
267 /* If we see a specialization scope inside a parameter scope,
268 then something is wrong. That corresponds to a declaration
269 like:
271 template <class T> template <> ...
273 which is always invalid since [temp.expl.spec] forbids the
274 specialization of a class member template if the enclosing
275 class templates are not explicitly specialized as well. */
277 {
280 else
282 }
287 }
289 /* Handle explicit instantiations. */
291 {
293 /* We've seen a template parameter list during an explicit
294 instantiation. For example:
296 template <class T> template void f(int);
298 This is erroneous. */
300 else
302 }
305 /* We've not seen enough template headers to match all the
306 specialized classes present. For example:
308 template <class T> void R<T>::S<T>::f(int);
310 This is invalid; there needs to be one set of template
311 parameters for each class. */
314 /* We're processing a non-template declaration (even though it may
315 be a member of a template class.) For example:
317 template <class T> void S<T>::f(int);
319 The `class T' matches the `S<T>', leaving no template headers
320 corresponding to the `f'. */
323 /* We've got too many template headers. For example:
325 template <> template <class T> void f (T);
327 There need to be more enclosing classes. */
329 else
330 /* This must be a template. It's of the form:
332 template <class T> template <class U> void S<T>::f(U);
334 This is a specialization if the innermost level was a
335 specialization; otherwise it's just a definition of the
336 template. */
338 }
340 /* Exit the current scope. */
342 void
344 {
346 }
348 /* When a label goes out of scope, check to see if that label was used
349 in a valid manner, and issue any appropriate warnings or errors. */
351 static void
353 {
355 {
357 {
358 location_t location;
362 /* FIXME want (LOCATION_FILE (input_location), (line)0) */
363 /* Avoid crashing later. */
365 }
366 else
368 }
371 }
373 /* Push all named labels into a vector, so that we can sort it on DECL_UID
374 to avoid code generation differences. */
376 int
378 {
381 }
383 /* Helper function to sort named label entries in a vector by DECL_UID. */
385 static int
387 {
395 }
397 /* At the end of a function, all labels declared within the function
398 go out of scope. BLOCK is the top-level block for the
399 function. */
401 static void
403 {
405 {
410 /* Push all the labels into a vector and sort them by DECL_UID,
411 so that gaps between DECL_UIDs don't affect code generation. */
416 {
421 /* Put the labels into the "variables" of the top-level block,
422 so debugger can see them. */
427 }
429 }
430 }
432 /* At the end of a block with local labels, restore the outer definition. */
434 static void
436 {
444 }
446 /* The following two routines are used to interface to Objective-C++.
447 The binding level is purposely treated as an opaque type. */
451 {
453 }
455 /* The following routine is used by the NeXT-style SJLJ exceptions;
456 variables get marked 'volatile' so as to not be clobbered by
457 _setjmp()/_longjmp() calls. All variables in the current scope,
458 as well as parent scopes up to (but not including) ENCLOSING_BLK
459 shall be thusly marked. */
461 void
463 {
469 {
470 tree decl;
475 /* Do not climb up past the current function. */
478 }
479 }
481 /* True if B is the level for the condition of a constexpr if. */
483 static bool
485 {
489 }
491 /* Update data for defined and undefined labels when leaving a scope. */
493 int
495 {
500 {
501 tree decl;
503 /* ENT->NAMES_IN_SCOPE may contain a mixture of DECLs and
504 TREE_LISTs representing OVERLOADs, so be careful. */
514 {
533 }
534 }
536 {
541 {
546 }
547 }
550 }
552 /* Saved errorcount to avoid -Wunused-but-set-{parameter,variable} warnings
553 when errors were reported, except for -Werror-unused-but-set-*. */
556 /* Exit a binding level.
557 Pop the level off, and restore the state of the identifier-decl mappings
558 that were in effect when this level was entered.
560 If KEEP == 1, this level had explicit declarations, so
561 and create a "block" (a BLOCK node) for the level
562 to record its declarations and subblocks for symbol table output.
564 If FUNCTIONBODY is nonzero, this level is the body of a function,
565 so create a block as if KEEP were set and also clear out all
566 label names.
568 If REVERSE is nonzero, reverse the order of decls before putting
569 them into the BLOCK. */
571 tree
573 {
574 tree link;
575 /* The chain of decls was accumulated in reverse order.
576 Put it into forward order, just for cleanliness. */
577 tree decls;
578 tree subblocks;
579 tree block;
580 tree decl;
582 scope_kind kind;
587 restart:
599 /* We used to use KEEP == 2 to indicate that the new block should go
600 at the beginning of the list of blocks at this binding level,
601 rather than the end. This hack is no longer used. */
607 /* Any uses of undefined labels, and any defined labels, now operate
608 under constraints of next binding contour. */
613 /* Get the decls in the order they were written.
614 Usually current_binding_level->names is in reverse order.
615 But parameter decls were previously put in forward order. */
618 current_binding_level->names
620 else
623 /* If there were any declarations or structure tags in that level,
624 or if this level is a function body,
625 create a BLOCK to record them for the life of this function. */
627 /* Avoid function body block if possible. */
633 {
636 }
638 /* In each subblock, record that this is its superior. */
643 /* We still support the old for-scope rules, whereby the variables
644 in a init statement were in scope after the for-statement ended.
645 We only use the new rules if flag_new_for_scope is nonzero. */
646 leaving_for_scope
649 /* Before we remove the declarations first check for unused variables. */
654 {
655 /* There are cases where D itself is a TREE_LIST. See in
656 push_local_binding where the list of decls returned by
657 getdecls is built. */
669 {
674 // For -Wunused-but-set-variable leave references alone.
677 {
679 OPT_Wunused_but_set_variable,
682 }
683 }
684 }
686 /* Remove declarations for all the DECLs in this level. */
688 {
690 /* It's hard to make this ARM compatibility hack play nicely with
691 lambdas, and it really isn't necessary in C++11 mode. */
694 {
697 tree ns_binding;
704 else
708 /* We have something like:
710 int i;
711 for (int i; ;);
713 and we are leaving the `for' scope. There's no reason to
714 keep the binding of the inner `i' in this case. */
718 /* Here, we have something like:
720 typedef int I;
722 void f () {
723 for (int I; ;);
724 }
726 We must pop the for-scope binding so we know what's a
727 type and what isn't. */
729 else
730 {
731 /* Mark this VAR_DECL as dead so that we can tell we left it
732 there only for backward compatibility. */
735 /* Keep track of what should have happened when we
736 popped the binding. */
738 {
741 }
743 /* Add it to the list of dead variables in the next
744 outermost binding to that we can remove these when we
745 leave that binding. */
748 link);
750 /* Although we don't pop the cxx_binding, we do clear
751 its SCOPE since the scope is going away now. */
754 }
755 }
756 else
757 {
758 tree name;
760 /* Remove the binding. */
772 }
773 }
775 /* Remove declarations for any `for' variables from inner scopes
776 that we kept around. */
781 /* Restore the IDENTIFIER_TYPE_VALUEs. */
786 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
791 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
792 list if a `using' declaration put them there. The debugging
793 back ends won't understand OVERLOAD, so we remove them here.
794 Because the BLOCK_VARS are (temporarily) shared with
795 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
796 popped all the bindings. Also remove undeduced 'auto' decls,
797 which LTO doesn't understand, and can't have been used by anything. */
799 {
803 {
805 || (!processing_template_decl
808 else
810 }
811 }
813 /* If the level being exited is the top level of a function,
814 check over all the labels. */
816 {
818 {
819 /* Since this is the top level block of a function, the vars are
820 the function's parameters. Don't leave them in the BLOCK
821 because they are found in the FUNCTION_DECL instead. */
824 }
825 else
827 }
831 {
832 tree stmt;
834 /* If this is a temporary binding created for a cleanup, then we'll
835 have pushed a statement list level. Pop that, create a new
836 BIND_EXPR for the block, and insert it into the stream. */
840 }
844 {
845 /* The current function is being defined, so its DECL_INITIAL
846 should be error_mark_node. */
850 {
852 {
855 }
856 else
858 }
859 }
861 current_binding_level->blocks
864 /* If we did not make a block for the level just exited,
865 any blocks made for inner levels
866 (since they cannot be recorded as subblocks in that level)
867 must be carried forward so they will later become subblocks
868 of something else. */
870 current_binding_level->blocks
873 /* Each and every BLOCK node created here in `poplevel' is important
874 (e.g. for proper debugging information) so if we created one
875 earlier, mark it as "used". */
879 /* All temporary bindings created for cleanups are popped silently. */
885 }
887 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
888 itself, calling F for each. The DATA is passed to F as well. */
890 static int
892 {
902 }
904 /* Walk all the namespaces, calling F for each. The DATA is passed to
905 F as well. */
907 int
909 {
911 }
913 /* Call wrapup_globals_declarations for the globals in NAMESPACE. */
915 int
917 {
924 {
925 tree decl;
935 {
937 OPT_Wunused_function,
940 }
941 }
943 /* Write out any globals that need to be output. */
945 }
947 /* Diagnose odr-used extern inline variables without definitions
948 in the current TU. */
949 int
951 {
954 tree decl;
966 }
967 \f
968 /* In C++, you don't have to write `struct S' to refer to `S'; you
969 can just use `S'. We accomplish this by creating a TYPE_DECL as
970 if the user had written `typedef struct S S'. Create and return
971 the TYPE_DECL for TYPE. */
973 tree
975 {
976 tree decl;
980 /* There are other implicit type declarations, like the one *within*
981 a class that allows you to write `S::S'. We must distinguish
982 amongst these. */
988 }
990 /* Remember a local name for name-mangling purposes. */
992 static void
994 {
1004 {
1007 {
1013 else
1019 }
1020 }
1024 }
1025 \f
1026 /* Subroutine of duplicate_decls: return truthvalue of whether
1027 or not types of these decls match.
1029 For C++, we must compare the parameter list so that `int' can match
1030 `int&' in a parameter position, but `int&' is not confused with
1031 `const int&'. */
1033 int
1035 {
1042 /* If the two DECLs are not even the same kind of thing, we're not
1043 interested in their types. */
1049 {
1054 tree r2;
1056 /* Specializations of different templates are different functions
1057 even if they have the same type. */
1072 /* A new declaration doesn't match a built-in one unless it
1073 is also extern "C". */
1081 /* A declaration with deduced return type should use its pre-deduction
1082 type for declaration matching. */
1086 {
1089 #ifndef NO_IMPLICIT_EXTERN_C
1092 #endif
1093 ))
1094 {
1098 }
1099 #ifndef NO_IMPLICIT_EXTERN_C
1107 {
1110 }
1111 #endif
1112 else
1113 types_match =
1119 }
1120 else
1123 /* The decls dont match if they correspond to two different versions
1124 of the same function. Disallow extern "C" functions to be
1125 versions for now. */
1130 {
1131 /* Mark functions as versions if necessary. Modify the mangled decl
1132 name if necessary. */
1137 {
1141 }
1143 {
1147 }
1150 }
1151 }
1153 {
1167 else
1168 // We don't need to check equivalently_constrained for variable and
1169 // function templates because we check it on the results.
1171 }
1172 else
1173 {
1174 /* Need to check scope for variable declaration (VAR_DECL).
1175 For typedef (TYPE_DECL), scope is ignored. */
1178 /* [dcl.link]
1179 Two declarations for an object with C language linkage
1180 with the same name (ignoring the namespace that qualify
1181 it) that appear in different namespace scopes refer to
1182 the same object. */
1192 else
1195 COMPARE_REDECLARATION);
1196 }
1198 // Normal functions can be constrained, as can variable partial
1199 // specializations.
1204 }
1206 /* If NEWDECL is `static' and an `extern' was seen previously,
1207 warn about it. OLDDECL is the previous declaration.
1209 Note that this does not apply to the C++ case of declaring
1210 a variable `extern const' and then later `const'.
1212 Don't complain about built-in functions, since they are beyond
1213 the user's control. */
1215 void
1217 {
1224 /* Don't get confused by static member functions; that's a different
1225 use of `static'. */
1230 /* If the old declaration was `static', or the new one isn't, then
1231 everything is OK. */
1235 /* It's OK to declare a builtin function as `static'. */
1244 }
1246 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1247 function templates. If their exception specifications do not
1248 match, issue a diagnostic. */
1250 static void
1252 tree old_decl)
1253 {
1257 /* Two default specs are equivalent, don't force evaluation. */
1267 /* [except.spec]
1269 If any declaration of a function has an exception-specification,
1270 all declarations, including the definition and an explicit
1271 specialization, of that function shall have an
1272 exception-specification with the same set of type-ids. */
1275 {
1283 /* We used to silently permit mismatched eh specs with
1284 -fno-exceptions, so make them a pedwarn now. */
1286 else
1291 }
1292 }
1294 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1295 Otherwise issue diagnostics. */
1297 static bool
1299 {
1309 {
1311 {
1312 /* Hide a built-in declaration. */
1316 }
1317 /* 7.1.5 [dcl.constexpr]
1318 Note: An explicit specialization can differ from the template
1319 declaration with respect to the constexpr specifier. */
1325 "redeclaration %qD differs in %<constexpr%> "
1330 }
1332 }
1334 // If OLDDECL and NEWDECL are concept declarations with the same type
1335 // (i.e., and template parameters), but different requirements,
1336 // emit diagnostics and return true. Otherwise, return false.
1339 {
1351 {
1356 {
1359 }
1360 }
1362 }
1364 /* DECL is a redeclaration of a function or function template. If
1365 it does have default arguments issue a diagnostic. Note: this
1366 function is used to enforce the requirements in C++11 8.3.6 about
1367 no default arguments in redeclarations. */
1369 static void
1371 {
1377 {
1379 "redeclaration of %q#D may not have default "
1382 }
1383 }
1385 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1387 DECL_ATTRIBUTES (fn)))
1389 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1390 If the redeclaration is invalid, a diagnostic is issued, and the
1391 error_mark_node is returned. Otherwise, OLDDECL is returned.
1393 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1394 returned.
1396 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1398 tree
1400 {
1404 tree new_template_info;
1411 /* If either the type of the new decl or the type of the old decl is an
1412 error_mark_node, then that implies that we have already issued an
1413 error (earlier) for some bogus type specification, and in that case,
1414 it is rather pointless to harass the user with yet more error message
1415 about the same declaration, so just pretend the types match here. */
1422 {
1433 }
1439 {
1443 else
1446 }
1448 /* Check for redeclaration and other discrepancies. */
1451 {
1454 {
1455 /* Avoid warnings redeclaring built-ins which have not been
1456 explicitly declared. */
1460 /* If you declare a built-in or predefined function name as static,
1461 the old definition is overridden, but optionally warn this was a
1462 bad choice of name. */
1464 {
1469 /* Discard the old built-in function. */
1471 }
1472 /* If the built-in is not ansi, then programs can override
1473 it even globally without an error. */
1478 else
1482 }
1484 {
1491 }
1493 {
1494 /* Avoid warnings redeclaring built-ins which have not been
1495 explicitly declared. */
1497 {
1500 /* A new declaration doesn't match a built-in one unless it
1501 is also extern "C". */
1513 /* Deal with fileptr_type_node. FILE type is not known
1514 at the time we create the builtins. */
1516 {
1523 {
1531 newdecl_is_friend);
1533 }
1534 }
1535 /* Likewise for const struct tm*. */
1537 {
1544 {
1552 newdecl_is_friend);
1554 }
1555 }
1560 OPT_Wbuiltin_declaration_mismatch,
1561 "declaration of %q+#D conflicts with built-in "
1563 }
1568 {
1569 /* A near match; override the builtin. */
1573 OPT_Wbuiltin_declaration_mismatch,
1574 "new declaration %q#D ambiguates built-in "
1576 else
1581 }
1582 else
1583 /* Discard the old built-in function. */
1586 /* Replace the old RTL to avoid problems with inlining. */
1588 }
1589 /* Even if the types match, prefer the new declarations type for
1590 built-ins which have not been explicitly declared, for
1591 exception lists, etc... */
1593 {
1600 }
1602 /* If a function is explicitly declared "throw ()", propagate that to
1603 the corresponding builtin. */
1608 {
1613 }
1615 /* Whether or not the builtin can throw exceptions has no
1616 bearing on this declarator. */
1620 {
1621 /* If a builtin function is redeclared as `static', merge
1622 the declarations, but make the original one static. */
1626 /* Make the old declaration consistent with the new one so
1627 that all remnants of the builtin-ness of this function
1628 will be banished. */
1631 }
1632 }
1634 {
1635 /* C++ Standard, 3.3, clause 4:
1636 "[Note: a namespace name or a class template name must be unique
1637 in its declarative region (7.3.2, clause 14). ]" */
1644 {
1649 {
1650 /* We do nothing special here, because C++ does such nasty
1651 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1652 get shadowed, and know that if we need to find a TYPE_DECL
1653 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1654 slot of the identifier. */
1656 }
1663 }
1672 }
1674 {
1676 /* These are certainly not duplicate declarations; they're
1677 from different scopes. */
1681 {
1682 /* The name of a class template may not be declared to refer to
1683 any other template, class, function, object, namespace, value,
1684 or type in the same scope. */
1687 {
1692 }
1699 /* Template functions can be disambiguated by
1700 return type. */
1703 // Template functions can also be disambiguated by
1704 // constraints.
1706 {
1710 }
1714 }
1716 {
1718 {
1720 newdecl);
1724 }
1725 /* For function versions, params and types match, but they
1726 are not ambiguous. */
1729 // The functions have the same parameter types.
1732 // And the same constraints.
1734 {
1739 }
1740 else
1742 }
1743 else
1744 {
1749 }
1750 }
1760 /* It's OK to have a template specialization and a non-template
1761 with the same type, or to have specializations of two
1762 different templates with the same type. Note that if one is a
1763 specialization, and the other is an instantiation of the same
1764 template, that we do not exit at this point. That situation
1765 can occur if we instantiate a template class, and then
1766 specialize one of its methods. This situation is valid, but
1767 the declarations must be merged in the usual way. */
1774 /* One of the declarations is a template instantiation, and the
1775 other is not a template at all. That's OK. */
1778 {
1779 /* In [namespace.alias] we have:
1781 In a declarative region, a namespace-alias-definition can be
1782 used to redefine a namespace-alias declared in that declarative
1783 region to refer only to the namespace to which it already
1784 refers.
1786 Therefore, if we encounter a second alias directive for the same
1787 alias, we can just ignore the second directive. */
1792 /* [namespace.alias]
1794 A namespace-name or namespace-alias shall not be declared as
1795 the name of any other entity in the same declarative region.
1796 A namespace-name defined at global scope shall not be
1797 declared as the name of any other entity in any global scope
1798 of the program. */
1803 }
1804 else
1805 {
1808 {
1816 }
1821 {
1822 /* Prototype decl follows defn w/o prototype. */
1827 }
1830 {
1831 /* [dcl.link]
1832 If two declarations of the same function or object
1833 specify different linkage-specifications ..., the program
1834 is ill-formed.... Except for functions with C++ linkage,
1835 a function declaration without a linkage specification
1836 shall not precede the first linkage specification for
1837 that function. A function can be declared without a
1838 linkage specification after an explicit linkage
1839 specification has been seen; the linkage explicitly
1840 specified in the earlier declaration is not affected by
1841 such a function declaration.
1843 DR 563 raises the question why the restrictions on
1844 functions should not also apply to objects. Older
1845 versions of G++ silently ignore the linkage-specification
1846 for this example:
1848 namespace N {
1849 extern int i;
1850 extern "C" int i;
1851 }
1853 which is clearly wrong. Therefore, we now treat objects
1854 like functions. */
1856 {
1857 /* There is no explicit linkage-specification, so we use
1858 the linkage from the previous declaration. */
1862 }
1863 else
1864 {
1870 }
1871 }
1874 ;
1876 {
1877 /* Note: free functions, as TEMPLATE_DECLs, are handled below. */
1880 as FUNCTION_DECLs. */
1882 /* C++11 8.3.6/6.
1883 Default arguments for a member function of a class
1884 template shall be specified on the initial declaration
1885 of the member function within the class template. */
1888 else
1889 {
1897 {
1900 {
1902 "default argument given for parameter "
1906 olddecl);
1907 }
1908 else
1909 {
1914 olddecl);
1915 }
1916 }
1917 }
1918 }
1919 }
1921 /* Do not merge an implicit typedef with an explicit one. In:
1923 class A;
1924 ...
1925 typedef class A A __attribute__ ((foo));
1927 the attribute should apply only to the typedef. */
1933 /* If new decl is `static' and an `extern' was seen previously,
1934 warn about it. */
1940 /* We have committed to returning 1 at this point. */
1942 {
1943 /* Now that functions must hold information normally held
1944 by field decls, there is extra work to do so that
1945 declaration information does not get destroyed during
1946 definition. */
1960 SET_OVERLOADED_OPERATOR_CODE
1964 /* Optionally warn about more than one declaration for the same
1965 name, but don't warn about a function declaration followed by a
1966 definition. */
1969 /* Don't warn about extern decl followed by definition. */
1971 /* Don't warn about friends, let add_friend take care of it. */
1973 /* Don't warn about declaration followed by specialization. */
1976 {
1978 OPT_Wredundant_decls,
1980 newdecl))
1983 }
1987 {
1989 {
1993 }
1995 }
1996 }
1998 /* Deal with C++: must preserve virtual function table size. */
2000 {
2010 }
2012 /* Copy all the DECL_... slots specified in the new decl
2013 except for any that we copy here from the old type. */
2018 {
2024 {
2027 }
2028 }
2031 {
2032 tree old_result;
2033 tree new_result;
2045 {
2046 /* Per C++11 8.3.6/4, default arguments cannot be added in later
2047 declarations of a function template. */
2056 {
2059 else
2071 }
2072 else
2073 {
2079 }
2080 }
2082 /* If the new declaration is a definition, update the file and
2083 line information on the declaration, and also make
2084 the old declaration the same definition. */
2086 {
2092 {
2093 tree parm;
2099 }
2100 }
2103 }
2106 {
2110 /* Automatically handles default parameters. */
2112 tree newtype;
2114 /* For typedefs use the old type, as the new type's DECL_NAME points
2115 at newdecl, which will be ggc_freed. */
2117 {
2118 /* But NEWTYPE might have an attribute, honor that. */
2123 {
2127 }
2129 /* And remove the new type from the variants list. */
2131 {
2136 {
2139 }
2140 }
2141 }
2142 else
2143 /* Merge the data types specified in the two decls. */
2147 {
2149 /* For already initialized vars, TREE_READONLY could have been
2150 cleared in cp_finish_decl, because the var needs runtime
2151 initialization or destruction. Make sure not to set
2152 TREE_READONLY on it again. */
2166 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
2169 {
2170 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
2175 }
2176 }
2178 /* An explicit specialization of a function template or of a member
2179 function of a class template can be declared transaction_safe
2180 independently of whether the corresponding template entity is declared
2181 transaction_safe. */
2194 /* Lay the type out, unless already done. */
2208 /* Merge the type qualifiers. */
2216 /* Merge deprecatedness. */
2220 /* Preserve function specific target and optimization options */
2222 {
2232 }
2234 /* Merge the initialization information. */
2237 {
2241 {
2244 }
2245 }
2248 {
2260 /* Keep the old RTL. */
2262 }
2265 {
2266 /* Keep the old RTL. We cannot keep the old RTL if the old
2267 declaration was for an incomplete object and the new
2268 declaration is not since many attributes of the RTL will
2269 change. */
2271 }
2272 }
2273 /* If cannot merge, then use the new type and qualifiers,
2274 and don't preserve the old rtl. */
2275 else
2276 {
2277 /* Clean out any memory we had of the old declaration. */
2287 }
2289 /* Merge the storage class information. */
2302 {
2311 {
2318 }
2321 {
2325 }
2330 /* If the OLDDECL is an instantiation and/or specialization,
2331 then the NEWDECL must be too. But, it may not yet be marked
2332 as such if the caller has created NEWDECL, but has not yet
2333 figured out that it is a redeclaration. */
2337 /* Don't really know how much of the language-specific
2338 values we should copy from old to new. */
2345 {
2349 {
2353 /* Remember the presence of explicit specialization args. */
2356 }
2358 }
2359 /* Only functions have these fields. */
2361 {
2366 /* DECL_THUNKS is only valid for virtual functions,
2367 otherwise it is a DECL_FRIEND_CONTEXT. */
2370 }
2371 /* Only variables have this field. */
2375 }
2378 {
2379 tree parm;
2381 /* Merge parameter attributes. */
2390 }
2394 {
2395 /* If newdecl is not a specialization, then it is not a
2396 template-related function at all. And that means that we
2397 should have exited above, returning 0. */
2401 /* From [temp.expl.spec]:
2403 If a template, a member template or the member of a class
2404 template is explicitly specialized then that
2405 specialization shall be declared before the first use of
2406 that specialization that would cause an implicit
2407 instantiation to take place, in every translation unit in
2408 which such a use occurs. */
2410 olddecl);
2416 /* Don't propagate visibility from the template to the
2417 specialization here. We'll do that in determine_visibility if
2418 appropriate. */
2421 /* [temp.expl.spec/14] We don't inline explicit specialization
2422 just because the primary template says so. */
2424 /* But still keep DECL_DISREGARD_INLINE_LIMITS in sync with
2425 the always_inline attribute. */
2428 {
2431 else
2435 }
2436 }
2438 {
2439 /* Never inline re-defined extern inline functions.
2440 FIXME: this could be better handled by keeping both
2441 function as separate declarations. */
2443 }
2444 else
2445 {
2447 {
2451 }
2453 ;
2467 }
2469 /* Preserve abstractness on cloned [cd]tors. */
2472 /* Update newdecl's parms to point at olddecl. */
2478 {
2482 }
2484 {
2485 /* These need to be copied so that the names are available.
2486 Note that if the types do match, we'll preserve inline
2487 info and other bits, but if not, we won't. */
2490 }
2491 /* If redeclaring a builtin function, it stays built in
2492 if newdecl is a gnu_inline definition, or if newdecl is just
2493 a declaration. */
2496 {
2499 /* If we're keeping the built-in definition, keep the rtl,
2500 regardless of declaration matches. */
2503 {
2506 {
2507 /* If a compatible prototype of these builtin functions
2508 is seen, assume the runtime implements it with the
2509 expected semantics. */
2518 }
2519 }
2520 }
2522 /* If defining a function declared with other language
2523 linkage, use the previously declared language linkage. */
2526 {
2528 /* Don't clear out the arguments if we're just redeclaring a
2529 function. */
2532 }
2533 }
2537 /* Now preserve various other info from the definition. */
2543 /* Warn about conflicting visibility specifications. */
2547 {
2549 "%qD: visibility attribute ignored because it "
2553 }
2554 /* Choose the declaration which specified visibility. */
2556 {
2559 }
2560 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2561 so keep this behavior. */
2563 {
2566 }
2567 /* Likewise for DECL_ALIGN, DECL_USER_ALIGN and DECL_PACKED. */
2569 {
2572 }
2577 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2578 with that from NEWDECL below. */
2580 {
2584 }
2586 /* Merge the USED information. */
2592 {
2597 }
2603 /* Merge the DECL_FUNCTION_VERSIONED information. newdecl will be copied
2604 to olddecl and deleted. */
2607 {
2608 /* Set the flag for newdecl so that it gets copied to olddecl. */
2610 /* newdecl will be purged after copying to olddecl and is no longer
2611 a version. */
2613 }
2616 {
2630 /* Preserve symtab node mapping. */
2634 /* If newdecl is a template instantiation, it is possible that
2635 the following sequence of events has occurred:
2637 o A friend function was declared in a class template. The
2638 class template was instantiated.
2640 o The instantiation of the friend declaration was
2641 recorded on the instantiation list, and is newdecl.
2643 o Later, however, instantiate_class_template called pushdecl
2644 on the newdecl to perform name injection. But, pushdecl in
2645 turn called duplicate_decls when it discovered that another
2646 declaration of a global function with the same name already
2647 existed.
2649 o Here, in duplicate_decls, we decided to clobber newdecl.
2651 If we're going to do that, we'd better make sure that
2652 olddecl, and not newdecl, is on the list of
2653 instantiations so that if we try to do the instantiation
2654 again we won't get the clobbered declaration. */
2656 new_template_info,
2657 olddecl);
2658 }
2659 else
2660 {
2667 {
2675 {
2688 }
2696 }
2697 }
2700 {
2704 {
2705 /* Merge the section attribute.
2706 We want to issue an error if the sections conflict but that must be
2707 done later in decl_attributes since we are called before attributes
2708 are assigned. */
2713 {
2717 else
2721 }
2722 }
2726 {
2730 }
2731 }
2737 {
2740 }
2742 /* NEWDECL contains the merged attribute lists.
2743 Update OLDDECL to be the same. */
2746 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2747 so that encode_section_info has a chance to look at the new decl
2748 flags and attributes. */
2755 /* The NEWDECL will no longer be needed. Because every out-of-class
2756 declaration of a member results in a call to duplicate_decls,
2757 freeing these nodes represents in a significant savings.
2759 Before releasing the node, be sore to remove function from symbol
2760 table that might have been inserted there to record comdat group.
2761 Be sure to however do not free DECL_STRUCT_FUNCTION because this
2762 structure is shared in between newdecl and oldecl. */
2766 {
2770 }
2772 /* Remove the associated constraints for newdecl, if any, before
2773 reclaiming memory. */
2780 }
2781 \f
2782 /* Return zero if the declaration NEWDECL is valid
2783 when the declaration OLDDECL (assumed to be for the same name)
2784 has already been seen.
2785 Otherwise return an error message format string with a %s
2786 where the identifier should go. */
2790 {
2792 {
2793 /* Because C++ can put things into name space for free,
2794 constructs like "typedef struct foo { ... } foo"
2795 would look like an erroneous redeclaration. */
2798 else
2800 }
2802 {
2803 /* If this is a pure function, its olddecl will actually be
2804 the original initialization to `0' (which we force to call
2805 abort()). Don't complain about redefinition in this case. */
2810 /* If both functions come from different namespaces, this is not
2811 a redeclaration - this is a conflict with a used function. */
2817 /* We'll complain about linkage mismatches in
2818 warn_extern_redeclared_static. */
2820 /* Defining the same name twice is no good. */
2823 {
2829 }
2832 {
2837 {
2841 else
2844 }
2845 }
2847 check_abi_tag_redeclaration
2852 }
2854 {
2858 {
2863 }
2881 {
2886 {
2890 else
2893 }
2894 }
2896 /* Core issue #226 (C++0x):
2898 If a friend function template declaration specifies a
2899 default template-argument, that declaration shall be a
2900 definition and shall be the only declaration of the
2901 function template in the translation unit. */
2912 }
2918 {
2919 /* Only variables can be thread-local, and all declarations must
2920 agree on this property. */
2924 else
2927 }
2929 {
2930 /* The objects have been declared at namespace scope. If either
2931 is a member of an anonymous union, then this is an invalid
2932 redeclaration. For example:
2934 int i;
2935 union { int i; };
2937 is invalid. */
2941 /* If at least one declaration is a reference, there is no
2942 conflict. For example:
2944 int i = 3;
2945 extern int i;
2947 is valid. */
2951 /* Static data member declared outside a class definition
2952 if the variable is defined within the class with constexpr
2953 specifier is declaration rather than definition (and
2954 deprecated). */
2959 {
2961 /* For now, only warn with explicit -Wdeprecated. */
2964 "redundant redeclaration of %<constexpr%> static "
2969 }
2971 /* Reject two definitions. */
2973 }
2974 else
2975 {
2976 /* Objects declared with block scope: */
2977 /* Reject two definitions, and reject a definition
2978 together with an external reference. */
2982 }
2983 }
2984 \f
2985 /* Hash and equality functions for the named_label table. */
2987 hashval_t
2989 {
2991 }
2993 bool
2995 {
2997 }
2999 /* Create a new label, named ID. */
3001 static tree
3003 {
3005 tree decl;
3013 /* Say where one reference is to the label, for the sake of the
3014 error if it is not defined. */
3017 /* Record the fact that this identifier is bound to this label. */
3020 /* Create the label htab for the function on demand. */
3024 /* Record this label on the list of labels used in this function.
3025 We do this before calling make_label_decl so that we get the
3026 IDENTIFIER_LABEL_VALUE before the new label is declared. */
3035 }
3037 /* Look for a label named ID in the current function. If one cannot
3038 be found, create one. (We keep track of used, but undefined,
3039 labels, and complain about them at the end of a function.) */
3041 static tree
3043 {
3044 tree decl;
3046 /* You can't use labels at global scope. */
3048 {
3051 }
3053 /* See if we've already got this label. */
3060 }
3062 /* Wrapper for lookup_label_1. */
3064 tree
3066 {
3067 tree ret;
3072 }
3074 /* Declare a local label named ID. */
3076 tree
3078 {
3079 tree decl;
3080 cp_label_binding bind;
3082 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
3083 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
3091 }
3093 /* Returns nonzero if it is ill-formed to jump past the declaration of
3094 DECL. Returns 2 if it's also a real problem. */
3096 static int
3098 {
3099 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
3100 with automatic storage duration is not in scope to a point where it is
3101 in scope is ill-formed unless the variable has scalar type, class type
3102 with a trivial default constructor and a trivial destructor, a
3103 cv-qualified version of one of these types, or an array of one of the
3104 preceding types and is declared without an initializer (8.5). */
3119 }
3121 /* A subroutine of check_previous_goto_1 and check_goto to identify a branch
3122 to the user. */
3124 static bool
3126 diagnostic_t diag_kind)
3127 {
3128 bool complained
3134 }
3136 /* Check that a single previously seen jump to a newly defined label
3137 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
3138 the jump context; NAMES are the names in scope in LEVEL at the jump
3139 context; LOCUS is the source position of the jump or 0. Returns
3140 true if all is well. */
3142 static bool
3145 {
3152 {
3158 }
3161 {
3167 {
3173 {
3175 DK_PERMERROR);
3177 }
3179 {
3183 else
3185 " enters scope of %q#D which has "
3187 }
3188 }
3193 {
3195 {
3197 DK_ERROR);
3199 }
3201 {
3204 else
3206 }
3208 }
3210 {
3212 {
3214 DK_ERROR);
3216 }
3220 }
3222 {
3224 {
3226 DK_ERROR);
3228 }
3233 }
3236 {
3238 {
3240 DK_ERROR);
3242 }
3247 }
3248 }
3251 }
3253 static void
3255 {
3259 }
3261 static bool
3263 {
3265 }
3267 /* Check that a new jump to a label DECL is OK. Called by
3268 finish_goto_stmt. */
3270 void
3272 {
3276 tree bad;
3279 /* We can't know where a computed goto is jumping.
3280 So we assume that it's OK. */
3284 /* We didn't record any information about this label when we created it,
3285 and there's not much point since it's trivial to analyze as a return. */
3293 /* If the label hasn't been defined yet, defer checking. */
3295 {
3298 /* Don't bother creating another use if the last goto had the
3299 same data, and will therefore create the same set of errors. */
3313 }
3318 {
3326 }
3329 {
3333 {
3334 /* Can't skip init of __exception_info. */
3336 {
3340 }
3344 }
3346 {
3350 else
3352 " enters scope of %q#D which has "
3354 }
3355 }
3358 {
3367 }
3370 {
3373 }
3375 {
3378 {
3382 {
3384 {
3389 }
3393 }
3394 }
3395 }
3396 }
3398 /* Check that a return is ok wrt OpenMP structured blocks.
3399 Called by finish_return_stmt. Returns true if all is well. */
3401 bool
3403 {
3407 {
3410 }
3414 }
3416 /* Define a label, specifying the location in the source file.
3417 Return the LABEL_DECL node for the label. */
3419 static tree
3421 {
3424 tree decl;
3432 /* After labels, make any new cleanups in the function go into their
3433 own new (temporary) binding contour. */
3443 {
3446 }
3447 else
3448 {
3451 /* Mark label as having been defined. */
3453 /* Say where in the source. */
3462 }
3465 }
3467 /* Wrapper for define_label_1. */
3469 tree
3471 {
3472 tree ret;
3477 }
3480 struct cp_switch
3481 {
3484 /* The SWITCH_STMT being built. */
3485 tree switch_stmt;
3486 /* A splay-tree mapping the low element of a case range to the high
3487 element, or NULL_TREE if there is no high element. Used to
3488 determine whether or not a new case label duplicates an old case
3489 label. We need a tree, rather than simply a hash table, because
3490 of the GNU case range extension. */
3491 splay_tree cases;
3492 /* Remember whether there was a case value that is outside the
3493 range of the original type of the controlling expression. */
3495 };
3497 /* A stack of the currently active switch statements. The innermost
3498 switch statement is on the top of the stack. There is no need to
3499 mark the stack for garbage collection because it is only active
3500 during the processing of the body of a function, and we never
3501 collect at that point. */
3505 /* Called right after a switch-statement condition is parsed.
3506 SWITCH_STMT is the switch statement being parsed. */
3508 void
3510 {
3518 }
3520 void
3522 {
3524 location_t switch_location;
3526 /* Emit warnings as needed. */
3528 const bool bool_cond_p
3540 }
3542 /* Convert a case constant VALUE in a switch to the type TYPE of the switch
3543 condition. Note that if TYPE and VALUE are already integral we don't
3544 really do the conversion because the language-independent
3545 warning/optimization code will work better that way. */
3547 static tree
3549 {
3556 {
3559 value = (perform_implicit_conversion_flags
3562 }
3564 }
3566 /* Note that we've seen a definition of a case label, and complain if this
3567 is a bad place for one. */
3569 tree
3571 {
3574 tree type;
3577 {
3578 tree label;
3580 /* For templates, just add the case label; we'll do semantic
3581 analysis at instantiation-time. */
3584 }
3586 /* Find the condition on which this switch statement depends. */
3603 /* After labels, make any new cleanups in the function go into their
3604 own new (temporary) binding contour. */
3611 }
3612 \f
3614 tree scope;
3615 tree name;
3616 tree template_id;
3619 };
3622 {
3625 /* Hash a TYPENAME_TYPE. */
3627 static hashval_t
3629 {
3630 hashval_t hash;
3636 }
3638 /* Compare two TYPENAME_TYPEs. */
3640 static bool
3642 {
3648 }
3649 };
3651 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3652 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3654 Returns the new TYPENAME_TYPE. */
3658 static tree
3661 {
3662 tree t;
3663 tree d;
3664 typename_info ti;
3666 hashval_t hash;
3681 /* See if we already have this type. */
3685 else
3686 {
3687 /* Build the TYPENAME_TYPE. */
3694 /* Build the corresponding TYPE_DECL. */
3701 /* Store it in the hash table. */
3704 /* TYPENAME_TYPEs must always be compared structurally, because
3705 they may or may not resolve down to another type depending on
3706 the currently open classes. */
3708 }
3711 }
3713 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3714 provided to name the type. Returns an appropriate type, unless an
3715 error occurs, in which case error_mark_node is returned. If we
3716 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3717 return that, rather than the _TYPE it corresponds to, in other
3718 cases we look through the type decl. If TF_ERROR is set, complain
3719 about errors, otherwise be quiet. */
3721 tree
3723 tsubst_flags_t complain)
3724 {
3725 tree fullname;
3726 tree t;
3735 {
3740 else
3741 /* Create a TEMPLATE_ID_EXPR for the type. */
3745 }
3752 {
3757 {
3761 }
3762 }
3764 {
3768 }
3773 {
3777 }
3779 /* When the CONTEXT is a dependent type, NAME could refer to a
3780 dependent base class of CONTEXT. But look inside it anyway
3781 if CONTEXT is a currently open scope, in case it refers to a
3782 member of the current instantiation or a non-dependent base;
3783 lookup will stop when we hit a dependent base. */
3785 /* We should only set WANT_TYPE when we're a nested typename type.
3786 Then we can give better diagnostics if we find a non-type. */
3788 else
3797 {
3799 {
3802 else
3805 }
3807 }
3809 /* Pull out the template from an injected-class-name (or multiple). */
3814 {
3816 {
3819 }
3821 }
3824 {
3829 }
3831 {
3836 }
3841 /* If we are currently parsing a template and if T is a typedef accessed
3842 through CONTEXT then we need to remember and check access of T at
3843 template instantiation time. */
3858 }
3860 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3861 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3862 in which case error_mark_node is returned.
3864 If PARM_LIST is non-NULL, also make sure that the template parameter
3865 list of TEMPLATE_DECL matches.
3867 If COMPLAIN zero, don't complain about any errors that occur. */
3869 tree
3871 tsubst_flags_t complain)
3872 {
3873 tree t;
3874 tree d;
3884 {
3894 {
3898 }
3902 {
3904 {
3908 }
3910 }
3913 complain))
3917 }
3919 /* Build the UNBOUND_CLASS_TEMPLATE. */
3925 /* Build the corresponding TEMPLATE_DECL. */
3934 }
3936 \f
3938 /* Push the declarations of builtin types into the namespace.
3939 RID_INDEX is the index of the builtin type in the array
3940 RID_POINTERS. NAME is the name used when looking up the builtin
3941 type. TYPE is the _TYPE node for the builtin type. */
3943 void
3946 tree type)
3947 {
3956 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3957 eliminated. Built-in types should not be looked up name; their
3958 names are keywords that the parser can recognize. However, there
3959 is code in c-common.c that uses identifier_global_value to look
3960 up built-in types by name. */
3962 {
3966 }
3968 {
3970 {
3973 }
3975 }
3982 }
3984 /* Push a type into the namespace so that the back ends ignore it. */
3986 static void
3988 {
3991 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3998 }
4000 /* A string for which we should create an IDENTIFIER_NODE at
4001 startup. */
4003 struct predefined_identifier
4004 {
4005 /* The name of the identifier. */
4007 /* The place where the IDENTIFIER_NODE should be stored. */
4009 /* Nonzero if this is the name of a constructor or destructor. */
4011 };
4013 /* Create all the predefined identifiers. */
4015 static void
4017 {
4020 /* A table of identifiers to create at startup. */
4024 /* Some of these names have a trailing space so that it is
4025 impossible for them to conflict with names written by users. */
4045 };
4048 {
4052 }
4053 }
4055 /* Create the predefined scalar types of C,
4056 and some nodes representing standard constants (0, 1, (void *)0).
4057 Initialize the global binding level.
4058 Make definitions for built-in primitive functions. */
4060 void
4062 {
4063 tree void_ftype;
4064 tree void_ftype_ptr;
4066 /* Create all the identifiers we need. */
4069 /* Create the global variables. */
4074 /* Enter the global namespace. */
4077 void_type_node);
4080 debug_hooks->register_main_translation_unit
4088 /* Initially, C. */
4091 /* Create the `std' namespace. */
4111 #if 0
4113 #endif
4122 void_ftype_ptr
4125 /* C++ extensions */
4130 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
4133 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
4134 result. */
4141 {
4142 /* Make sure we get a unique function type, so we can give
4143 its pointer type a name. (This wins for gdb.) */
4150 }
4153 vtbl_type_node
4172 /* Now, C++. */
4177 {
4180 }
4186 {
4189 tree ptr_ftype_sizetype;
4190 tree new_eh_spec;
4192 ptr_ftype_sizetype
4195 {
4196 tree bad_alloc_id;
4197 tree bad_alloc_type_node;
4198 tree bad_alloc_decl;
4204 bad_alloc_decl
4209 new_eh_spec
4211 }
4212 else
4215 /* Ensure attribs.c is initialized. */
4218 /* Ensure constraint.cc is initialized. */
4222 NULL_TREE);
4225 extvisattr);
4239 {
4240 /* Also push the sized deallocation variants:
4241 void operator delete(void*, std::size_t) throw();
4242 void operator delete[](void*, std::size_t) throw(); */
4243 tree void_ftype_ptr_size
4247 extvisattr);
4251 }
4254 {
4261 /* operator new (size_t, align_val_t); */
4273 /* operator delete (void *, align_val_t); */
4282 {
4283 /* operator delete (void *, size_t, align_val_t); */
4286 NULL_TREE);
4291 }
4292 }
4304 }
4306 abort_fndecl
4310 /* Perform other language dependent initializations. */
4324 /* Show we use EH for cleanups. */
4327 }
4329 /* Generate an initializer for a function naming variable from
4330 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
4331 filled in with the type of the init. */
4333 tree
4335 {
4337 tree type;
4342 {
4346 }
4355 else
4359 }
4361 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
4362 the decl, LOC is the location to give the decl, NAME is the
4363 initialization string and TYPE_DEP indicates whether NAME depended
4364 on the type of the function. We make use of that to detect
4365 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
4366 at the point of first use, so we mustn't push the decl now. */
4368 static tree
4370 {
4373 tree type;
4380 /* As we're using pushdecl_with_scope, we must set the context. */
4390 {
4398 LOOKUP_ONLYCONVERTING);
4399 }
4400 else
4401 {
4404 }
4407 }
4409 static tree
4411 {
4420 /* Runtime library routines are, by definition, available in an
4421 external shared object. */
4429 else
4432 /* A function in the user's namespace should have an explicit
4433 declaration before it is used. Mark the built-in function as
4434 anticipated but not actually declared. */
4438 {
4441 /* Treat __*_chk fortification functions as anticipated as well,
4442 unless they are __builtin_*. */
4447 }
4450 }
4452 tree
4454 {
4457 /* All builtins that don't begin with an '_' should additionally
4458 go in the 'std' namespace. */
4460 {
4465 }
4468 }
4470 /* Like cxx_builtin_function, but guarantee the function is added to the global
4471 scope. This is to allow function specific options to add new machine
4472 dependent builtins when the target ISA changes via attribute((target(...)))
4473 which saves space on program startup if the program does not use non-generic
4474 ISAs. */
4476 tree
4478 {
4482 /* All builtins that don't begin with an '_' should additionally
4483 go in the 'std' namespace. */
4485 {
4490 }
4493 }
4495 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
4496 function. Not called directly. */
4498 static tree
4501 {
4508 /* Runtime library routines are, by definition, available in an
4509 external shared object. */
4514 }
4516 /* Returns the _DECL for a library function with C++ linkage. */
4518 static tree
4521 {
4526 }
4528 /* Like build_library_fn, but takes a C string instead of an
4529 IDENTIFIER_NODE. */
4531 tree
4533 {
4535 }
4537 /* Like build_cp_library_fn, but takes a C string instead of an
4538 IDENTIFIER_NODE. */
4540 tree
4542 {
4544 ecf_flags);
4545 }
4547 /* Like build_library_fn, but also pushes the function so that we will
4548 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
4549 may throw exceptions listed in RAISES. */
4551 tree
4553 {
4554 tree fn;
4562 }
4564 /* Like build_cp_library_fn, but also pushes the function so that it
4565 will be found by normal lookup. */
4567 static tree
4570 {
4572 operator_code,
4578 }
4580 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
4581 a FUNCTION_TYPE. */
4583 tree
4585 {
4588 }
4590 /* Like push_library_fn, but also note that this function throws
4591 and does not return. Used for __throw_foo and the like. */
4593 tree
4595 {
4598 }
4599 \f
4600 /* When we call finish_struct for an anonymous union, we create
4601 default copy constructors and such. But, an anonymous union
4602 shouldn't have such things; this function undoes the damage to the
4603 anonymous union type T.
4605 (The reason that we create the synthesized methods is that we don't
4606 distinguish `union { int i; }' from `typedef union { int i; } U'.
4607 The first is an anonymous union; the second is just an ordinary
4608 union type.) */
4610 void
4612 {
4615 /* Wipe out memory of synthesized methods. */
4623 /* Splice the implicitly generated functions out of the TYPE_METHODS
4624 list. */
4627 {
4630 else
4632 }
4634 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
4636 {
4642 else
4645 }
4647 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4648 assignment operators (because they cannot have these methods themselves).
4649 For anonymous unions this is already checked because they are not allowed
4650 in any union, otherwise we have to check it. */
4652 {
4657 {
4660 {
4670 }
4671 }
4672 }
4673 }
4675 /* Warn for an attribute located at LOCATION that appertains to the
4676 class type CLASS_TYPE that has not been properly placed after its
4677 class-key, in it class-specifier. */
4679 void
4681 tree class_type)
4682 {
4686 "attribute ignored in declaration "
4691 }
4693 /* Make sure that a declaration with no declarator is well-formed, i.e.
4694 just declares a tagged type or anonymous union.
4696 Returns the type declared; or NULL_TREE if none. */
4698 tree
4701 {
4704 /* If a class, struct, or enum type is declared by the DECLSPECS
4705 (i.e, if a class-specifier, enum-specifier, or non-typename
4706 elaborated-type-specifier appears in the DECLSPECS),
4707 DECLARED_TYPE is set to the corresponding type. */
4714 {
4720 }
4733 {
4735 "%<auto%> can only be specified for variables "
4738 }
4739 /* Check for an anonymous union. */
4742 {
4743 /* 7/3 In a simple-declaration, the optional init-declarator-list
4744 can be omitted only when declaring a class (clause 9) or
4745 enumeration (7.2), that is, when the decl-specifier-seq contains
4746 either a class-specifier, an elaborated-type-specifier with
4747 a class-key (9.1), or an enum-specifier. In these cases and
4748 whenever a class-specifier or enum-specifier is present in the
4749 decl-specifier-seq, the identifiers in these specifiers are among
4750 the names being declared by the declaration (as class-name,
4751 enum-names, or enumerators, depending on the syntax). In such
4752 cases, and except for the declaration of an unnamed bit-field (9.6),
4753 the decl-specifier-seq shall introduce one or more names into the
4754 program, or shall redeclare a name introduced by a previous
4755 declaration. [Example:
4756 enum { }; // ill-formed
4757 typedef class { }; // ill-formed
4758 --end example] */
4760 {
4763 }
4770 }
4772 else
4773 {
4781 && (!current_class_type
4790 "a storage class can only be specified for objects "
4794 "%<const%> can only be specified for objects and "
4798 "%<volatile%> can only be specified for objects and "
4802 "%<__restrict%> can only be specified for objects and "
4806 "%<__thread%> can only be specified for objects "
4814 }
4817 {
4818 location_t loc;
4821 /* For a non-template class, use the name location. */
4823 else
4824 /* For a template class (an explicit instantiation), use the
4825 current location. */
4829 /* [dcl.attr.grammar]/4:
4831 No attribute-specifier-seq shall appertain to an explicit
4832 instantiation. */
4833 {
4836 declared_type))
4838 "no attribute can be applied to "
4840 }
4841 else
4843 }
4846 }
4848 /* Called when a declaration is seen that contains no names to declare.
4849 If its type is a reference to a structure, union or enum inherited
4850 from a containing scope, shadow that tag name for the current scope
4851 with a forward reference.
4852 If its type defines a new named structure or union
4853 or defines an enum, it is valid but we need not do anything here.
4854 Otherwise, it is an error.
4856 C++: may have to grok the declspecs to learn about static,
4857 complain for anonymous unions.
4859 Returns the TYPE declared -- or NULL_TREE if none. */
4861 tree
4863 {
4873 /* This is where the variables in an anonymous union are
4874 declared. An anonymous union declaration looks like:
4875 union { ... } ;
4876 because there is no declarator after the union, the parser
4877 sends that declaration here. */
4879 {
4883 {
4887 }
4888 }
4891 }
4892 \f
4893 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4895 tree
4899 {
4900 tree attrs;
4901 tree type;
4902 enum decl_context context
4908 {
4913 /* A template type parameter or other dependent type. */
4916 else
4918 }
4920 }
4922 /* Process a DECLARATOR for a function-scope variable declaration,
4923 namespace-scope variable declaration, or function declaration.
4924 (Function definitions go through start_function; class member
4925 declarations appearing in the body of the class go through
4926 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4927 If an error occurs, the error_mark_node is returned instead.
4929 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4930 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4931 for an explicitly defaulted function, or SD_DELETED for an explicitly
4932 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4933 implicitly initialized via a default constructor. ATTRIBUTES and
4934 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4936 The scope represented by the context of the returned DECL is pushed
4937 (if it is not the global namespace) and is assigned to
4938 *PUSHED_SCOPE_P. The caller is then responsible for calling
4939 pop_scope on *PUSHED_SCOPE_P if it is set. */
4941 tree
4945 tree attributes,
4946 tree prefix_attributes,
4948 {
4949 tree decl;
4950 tree context;
4957 /* An object declared as __attribute__((deprecated)) suppresses
4958 warnings of uses of other deprecated items. */
4977 /* Is it valid for this decl to have an initializer at all?
4978 If not, set INITIALIZED to zero, which will indirectly
4979 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4982 {
4985 }
4988 {
4992 decl);
4996 }
5002 /* If this is a typedef that names the class for linkage purposes
5003 (7.1.3p8), apply any attributes directly to the type. */
5008 else
5011 /* Set attributes here so if duplicate decl, will have proper attributes. */
5014 /* Dllimported symbols cannot be defined. Static data members (which
5015 can be initialized in-class and dllimported) go through grokfield,
5016 not here, so we don't need to exclude those decls when checking for
5017 a definition. */
5019 {
5022 }
5024 /* If #pragma weak was used, mark the decl weak now. */
5036 {
5040 {
5046 {
5050 else
5051 {
5057 }
5058 }
5059 else
5060 {
5065 {
5072 }
5073 /* Static data member are tricky; an in-class initialization
5074 still doesn't provide a definition, so the in-class
5075 declaration will have DECL_EXTERNAL set, but will have an
5076 initialization. Thus, duplicate_decls won't warn
5077 about this situation, and so we check here. */
5085 }
5086 }
5087 else
5088 {
5090 this_tmpl
5091 ? current_template_parms
5097 }
5099 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
5101 /* Do not mark DECL as an explicit specialization if it was not
5102 already marked as an instantiation; a declaration should
5103 never be marked as a specialization unless we know what
5104 template is being specialized. */
5106 {
5111 else
5114 /* [temp.expl.spec] An explicit specialization of a static data
5115 member of a template is a definition if the declaration
5116 includes an initializer; otherwise, it is a declaration.
5118 We check for processing_specialization so this only applies
5119 to the new specialization syntax. */
5122 }
5125 /* Aliases are definitions. */
5128 decl);
5129 }
5133 /* Enter this declaration into the symbol table. Don't push the plain
5134 VAR_DECL for a variable template. */
5147 {
5148 /* This is a const variable with implicit 'static'. Set
5149 DECL_THIS_STATIC so we can tell it from variables that are
5150 !TREE_PUBLIC because of the anonymous namespace. */
5153 }
5157 {
5161 decl);
5164 else
5168 }
5174 }
5176 /* Process the declaration of a variable DECL. INITIALIZED is true
5177 iff DECL is explicitly initialized. (INITIALIZED is false if the
5178 variable is initialized via an implicitly-called constructor.)
5179 This function must be called for ordinary variables (including, for
5180 example, implicit instantiations of templates), but must not be
5181 called for template declarations. */
5183 void
5185 {
5186 tree type;
5201 /* If an explicit initializer is present, or if this is a definition
5202 of an aggregate, then we need a complete type at this point.
5203 (Scalars are always complete types, so there is nothing to
5204 check.) This code just sets COMPLETE_P; errors (if necessary)
5205 are issued below. */
5207 && !complete_p
5209 {
5211 /* We will not yet have set TREE_READONLY on DECL if the type
5212 was "const", but incomplete, before this point. But, now, we
5213 have a complete type, so we can try again. */
5215 }
5218 /* Is it valid for this decl to have an initializer at all? */
5219 {
5220 /* Don't allow initializations for incomplete types except for
5221 arrays which might be completed by the initialization. */
5227 {
5230 }
5232 {
5235 /* else we already gave an error in start_decl. */
5236 }
5237 }
5239 {
5242 else
5243 {
5245 decl);
5246 /* Change the type so that assemble_variable will give
5247 DECL an rtl we can live with: (mem (const_int 0)). */
5249 }
5250 }
5252 /* Create a new scope to hold this declaration if necessary.
5253 Whether or not a new scope is necessary cannot be determined
5254 until after the type has been completed; if the type is a
5255 specialization of a class template it is not until after
5256 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
5257 will be set correctly. */
5259 }
5261 /* Handle initialization of references. DECL, TYPE, and INIT have the
5262 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
5263 but will be set to a new CLEANUP_STMT if a temporary is created
5264 that must be destroyed subsequently.
5266 Returns an initializer expression to use to initialize DECL, or
5267 NULL if the initialization can be performed statically.
5269 Quotes on semantics can be found in ARM 8.4.3. */
5271 static tree
5273 {
5275 {
5281 }
5285 tf_warning_or_error);
5290 /* Note: default conversion is only called in very special cases. */
5293 /* check_initializer handles this for non-reference variables, but for
5294 references we need to do it here or the initializer will get the
5295 incomplete array type and confuse later calls to
5296 cp_complete_array_type. */
5301 {
5305 }
5307 /* Convert INIT to the reference type TYPE. This may involve the
5308 creation of a temporary, whose lifetime must be the same as that
5309 of the reference. If so, a DECL_EXPR for the temporary will be
5310 added just after the DECL_EXPR for DECL. That's why we don't set
5311 DECL_INITIAL for local references (instead assigning to them
5312 explicitly); we need to allow the temporary to be initialized
5313 first. */
5315 tf_warning_or_error);
5316 }
5318 /* Designated initializers in arrays are not supported in GNU C++.
5319 The parser cannot detect this error since it does not know whether
5320 a given brace-enclosed initializer is for a class type or for an
5321 array. This function checks that CE does not use a designated
5322 initializer. If it does, an error is issued. Returns true if CE
5323 is valid, i.e., does not have a designated initializer. */
5325 static bool
5328 {
5329 /* Designated initializers for array elements are not supported. */
5331 {
5332 /* The parser only allows identifiers as designated
5333 initializers. */
5335 {
5339 }
5341 {
5345 }
5353 {
5354 /* A C99 designator is OK if it matches the current index. */
5357 else
5359 }
5360 else
5365 }
5368 }
5370 /* When parsing `int a[] = {1, 2};' we don't know the size of the
5371 array until we finish parsing the initializer. If that's the
5372 situation we're in, update DECL accordingly. */
5374 static void
5376 {
5382 {
5383 /* do_default is really a C-ism to deal with tentative definitions.
5384 But let's leave it here to ease the eventual merge. */
5389 /* Check that there are no designated initializers in INIT, as
5390 those are not supported in GNU C++, and as the middle-end
5391 will crash if presented with a non-numeric designated
5392 initializer. */
5394 {
5397 HOST_WIDE_INT i;
5401 }
5404 {
5406 do_default);
5408 {
5412 }
5414 {
5416 {
5419 }
5420 /* If a `static' var's size isn't known, make it extern as
5421 well as static, so it does not get allocated. If it's not
5422 `static', then don't mark it extern; finish_incomplete_decl
5423 will give it a default size and it will get allocated. */
5426 }
5428 {
5431 }
5432 }
5437 }
5438 }
5440 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
5441 any appropriate error messages regarding the layout. */
5443 static void
5445 {
5446 tree type;
5452 /* If we haven't already laid out this declaration, do so now.
5453 Note that we must not call complete type for an external object
5454 because it's type might involve templates that we are not
5455 supposed to instantiate yet. (And it's perfectly valid to say
5456 `extern X x' for some incomplete type `X'.) */
5465 {
5466 /* An automatic variable with an incomplete type: that is an error.
5467 Don't talk about array types here, since we took care of that
5468 message in grokdeclarator. */
5472 }
5473 #if 0
5474 /* Keep this code around in case we later want to control debug info
5475 based on whether a type is "used". (jason 1999-11-11) */
5478 /* Let debugger know it should output info for this type. */
5483 #endif
5488 {
5491 else
5492 {
5496 }
5497 }
5498 }
5500 /* If a local static variable is declared in an inline function, or if
5501 we have a weak definition, we must endeavor to create only one
5502 instance of the variable at link-time. */
5504 void
5506 {
5507 /* Static data in a function with comdat linkage also has comdat
5508 linkage. */
5510 /* Don't mess with __FUNCTION__. */
5515 {
5517 {
5518 /* With weak symbols, we simply make the variable COMDAT;
5519 that will cause copies in multiple translations units to
5520 be merged. */
5522 }
5523 else
5524 {
5527 {
5528 /* Without weak symbols, we can use COMMON to merge
5529 uninitialized variables. */
5532 }
5533 else
5534 {
5535 /* While for initialized variables, we must use internal
5536 linkage -- which means that multiple copies will not
5537 be merged. */
5543 "%q#D are wrong (you%'ll wind up with "
5545 else
5547 "static data %q#D are wrong (you%'ll wind "
5553 }
5554 }
5555 }
5556 }
5558 /* Issue an error message if DECL is an uninitialized const variable. */
5560 static void
5562 {
5565 /* ``Unless explicitly declared extern, a const object does not have
5566 external linkage and must be initialized. ($8.4; $12.1)'' ARM
5567 7.1.6 */
5572 {
5580 else
5581 {
5584 decl);
5586 }
5589 {
5590 tree defaulted_ctor;
5597 "constructor is not user-provided because it is "
5600 "and the implicitly-defined constructor does not "
5602 }
5603 }
5604 }
5605 \f
5606 /* Structure holding the current initializer being processed by reshape_init.
5607 CUR is a pointer to the current element being processed, END is a pointer
5608 after the last element present in the initializer. */
5609 struct reshape_iter
5610 {
5613 };
5617 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
5618 returned is the next FIELD_DECL (possibly FIELD itself) that can be
5619 initialized. If there are no more such fields, the return value
5620 will be NULL. */
5622 tree
5624 {
5633 }
5635 /* Return true for [dcl.init.list] direct-list-initialization from
5636 single element of enumeration with a fixed underlying type. */
5638 bool
5640 {
5649 }
5651 /* Subroutine of reshape_init_array and reshape_init_vector, which does
5652 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
5653 INTEGER_CST representing the size of the array minus one (the maximum index),
5654 or NULL_TREE if the array was declared without specifying the size. D is
5655 the iterator within the constructor. */
5657 static tree
5659 tsubst_flags_t complain)
5660 {
5661 tree new_init;
5666 /* The initializer for an array is always a CONSTRUCTOR. */
5670 {
5671 /* Minus 1 is used for zero sized arrays. */
5677 /* sizetype is sign extended, not zero extended. */
5678 else
5680 }
5682 /* Loop until there are no more initializers. */
5686 {
5687 tree elt_init;
5692 complain);
5700 /* This can happen with an invalid initializer (c++/54501). */
5703 }
5706 }
5708 /* Subroutine of reshape_init_r, processes the initializers for arrays.
5709 Parameters are the same of reshape_init_r. */
5711 static tree
5713 {
5722 }
5724 /* Subroutine of reshape_init_r, processes the initializers for vectors.
5725 Parameters are the same of reshape_init_r. */
5727 static tree
5729 {
5735 {
5738 {
5743 }
5746 }
5748 /* For a vector, we initialize it as an array of the appropriate size. */
5753 }
5755 /* Subroutine of reshape_init_r, processes the initializers for classes
5756 or union. Parameters are the same of reshape_init_r. */
5758 static tree
5760 tsubst_flags_t complain)
5761 {
5762 tree field;
5763 tree new_init;
5767 /* The initializer for a class is always a CONSTRUCTOR. */
5772 {
5773 /* [dcl.init.aggr]
5775 An initializer for an aggregate member that is an
5776 empty class shall have the form of an empty
5777 initializer-list {}. */
5779 {
5783 }
5785 }
5787 /* Loop through the initializable fields, gathering initializers. */
5789 {
5790 tree field_init;
5793 /* Handle designated initializers, as an extension. */
5795 {
5800 /* We already reshaped this. */
5804 else
5805 {
5810 }
5813 {
5818 }
5819 }
5821 /* If we processed all the member of the class, we are done. */
5831 {
5832 /* This can happen with an invalid initializer for a flexible
5833 array member (c++/54441). */
5837 }
5841 /* [dcl.init.aggr]
5843 When a union is initialized with a brace-enclosed
5844 initializer, the braces shall only contain an
5845 initializer for the first member of the union. */
5850 }
5853 }
5855 /* Subroutine of reshape_init_r. We're in a context where C99 initializer
5856 designators are not valid; either complain or return true to indicate
5857 that reshape_init_r should return error_mark_node. */
5859 static bool
5861 {
5863 {
5867 else
5869 }
5871 }
5873 /* Subroutine of reshape_init, which processes a single initializer (part of
5874 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5875 iterator within the CONSTRUCTOR which points to the initializer to process.
5876 FIRST_INITIALIZER_P is true if this is the first initializer of the
5877 outermost CONSTRUCTOR node. */
5879 static tree
5881 tsubst_flags_t complain)
5882 {
5893 {
5894 /* A complex type can be initialized from one or two initializers,
5895 but braces are not elided. */
5898 {
5900 {
5903 else
5905 }
5906 }
5908 {
5916 }
5918 }
5920 /* A non-aggregate type is always initialized with a single
5921 initializer. */
5923 {
5924 /* It is invalid to initialize a non-aggregate type with a
5925 brace-enclosed initializer before C++0x.
5926 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
5927 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
5928 a CONSTRUCTOR (with a record type). */
5930 /* Don't complain about a capture-init. */
5933 {
5935 {
5937 /* Isn't value-initialization. */
5939 {
5942 type);
5944 }
5945 }
5946 else
5948 }
5952 }
5954 /* "If T is a class type and the initializer list has a single element of
5955 type cv U, where U is T or a class derived from T, the object is
5956 initialized from that element." Even if T is an aggregate. */
5958 && first_initializer_p
5961 {
5964 }
5966 /* [dcl.init.aggr]
5968 All implicit type conversions (clause _conv_) are considered when
5969 initializing the aggregate member with an initializer from an
5970 initializer-list. If the initializer can initialize a member,
5971 the member is initialized. Otherwise, if the member is itself a
5972 non-empty subaggregate, brace elision is assumed and the
5973 initializer is considered for the initialization of the first
5974 member of the subaggregate. */
5976 /* But don't try this for the first initializer, since that would be
5977 looking through the outermost braces; A a2 = { a1 }; is not a
5978 valid aggregate initialization. */
5979 && !first_initializer_p
5982 complain)))
5983 {
5986 }
5988 /* [dcl.init.string]
5990 A char array (whether plain char, signed char, or unsigned char)
5991 can be initialized by a string-literal (optionally enclosed in
5992 braces); a wchar_t array can be initialized by a wide
5993 string-literal (optionally enclosed in braces). */
5996 {
5999 /* Strip one level of braces if and only if they enclose a single
6000 element (as allowed by [dcl.init.string]). */
6004 {
6006 }
6008 /* If it's a string literal, then it's the initializer for the array
6009 as a whole. Otherwise, continue with normal initialization for
6010 array types (one value per array element). */
6012 {
6017 }
6018 }
6020 /* The following cases are about aggregates. If we are not within a full
6021 initializer already, and there is not a CONSTRUCTOR, it means that there
6022 is a missing set of braces (that is, we are processing the case for
6023 which reshape_init exists). */
6025 {
6027 {
6029 /* There is no need to reshape pointer-to-member function
6030 initializers, as they are always constructed correctly
6031 by the front end. */
6032 ;
6034 /* For a nested compound literal, there is no need to reshape since
6035 brace elision is not allowed. Even if we decided to allow it,
6036 we should add a call to reshape_init in finish_compound_literal,
6037 before calling digest_init, so changing this code would still
6038 not be necessary. */
6040 else
6041 {
6045 }
6046 }
6051 type);
6052 }
6054 /* Dispatch to specialized routines. */
6061 else
6063 }
6065 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
6066 brace-enclosed aggregate initializer.
6068 INIT is the CONSTRUCTOR containing the list of initializers describing
6069 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
6070 It may not presently match the shape of the TYPE; for example:
6072 struct S { int a; int b; };
6073 struct S a[] = { 1, 2, 3, 4 };
6075 Here INIT will hold a vector of four elements, rather than a
6076 vector of two elements, each itself a vector of two elements. This
6077 routine transforms INIT from the former form into the latter. The
6078 revised CONSTRUCTOR node is returned. */
6080 tree
6082 {
6084 reshape_iter d;
6085 tree new_init;
6091 /* An empty constructor does not need reshaping, and it is always a valid
6092 initializer. */
6096 /* Handle [dcl.init.list] direct-list-initialization from
6097 single element of enumeration with a fixed underlying type. */
6099 {
6103 else
6105 }
6107 /* Recurse on this CONSTRUCTOR. */
6115 /* Make sure all the element of the constructor were used. Otherwise,
6116 issue an error about exceeding initializers. */
6118 {
6121 else
6123 }
6130 }
6132 /* Verify array initializer. Returns true if errors have been reported. */
6134 bool
6136 {
6139 /* The array type itself need not be complete, because the
6140 initializer may tell us how many elements are in the array.
6141 But, the elements of the array must be complete. */
6143 {
6147 else
6150 }
6151 /* A compound literal can't have variable size. */
6155 {
6158 }
6160 }
6162 /* Subroutine of check_initializer; args are passed down from that function.
6163 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
6165 static tree
6168 {
6171 }
6173 /* Verify INIT (the initializer for DECL), and record the
6174 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
6175 grok_reference_init.
6177 If the return value is non-NULL, it is an expression that must be
6178 evaluated dynamically to initialize DECL. */
6180 static tree
6182 {
6185 tree core_type;
6187 /* Things that are going to be initialized need to have complete
6188 type. */
6192 {
6193 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
6194 it doesn't have storage to be initialized. */
6197 }
6200 /* We will have already complained. */
6204 {
6207 }
6209 {
6214 }
6215 else
6216 /* There is no way to make a variable-sized class type in GNU C++. */
6220 {
6223 {
6225 {
6228 }
6230 {
6232 "scalar object %qD requires one element in "
6236 }
6237 }
6238 }
6241 {
6248 }
6250 ;
6253 {
6255 {
6258 }
6261 /* Do not reshape constructors of vectors (they don't need to be
6262 reshaped. */
6264 {
6266 {
6268 tf_warning_or_error);
6270 }
6272 {
6273 /* Don't reshape if the class has constructors. */
6276 "in C++98 %qD must be initialized by "
6278 decl);
6279 }
6281 {
6284 }
6285 else
6286 {
6289 }
6290 }
6294 {
6297 /* We get here with code like `int a (2);' */
6299 tf_warning_or_error);
6300 }
6302 /* If DECL has an array type without a specific bound, deduce the
6303 array size from the initializer. */
6317 {
6320 /* A constructor call is a non-trivial initializer even if
6321 it isn't explicitly written. */
6325 /* If this is a constexpr initializer, expand_default_init will
6326 have returned an INIT_EXPR rather than a CALL_EXPR. In that
6327 case, pull the initializer back out and pass it down into
6328 store_init_value. */
6333 {
6336 /* Don't call digest_init; it's unnecessary and will complain
6337 about aggregate initialization of non-aggregate classes. */
6339 }
6341 {
6342 /* Declared constexpr, but no suitable initializer; massage
6343 init appropriately so we can pass it into store_init_value
6344 for the error. */
6347 {
6351 }
6353 }
6354 else
6356 }
6359 {
6360 /* In aggregate initialization of a variable, each element
6361 initialization is a full-expression because there is no
6362 enclosing expression. */
6377 }
6378 }
6379 else
6380 {
6388 }
6394 {
6395 /* We might have set these in cp_finish_decl. */
6398 }
6402 {
6410 else
6414 {
6418 }
6420 }
6423 }
6425 /* If DECL is not a local variable, give it RTL. */
6427 static void
6429 {
6433 /* Set the DECL_ASSEMBLER_NAME for the object. */
6435 {
6436 /* The `register' keyword, when used together with an
6437 asm-specification, indicates that the variable should be
6438 placed in a particular register. */
6440 {
6443 }
6444 else
6445 {
6450 }
6451 }
6453 /* Handle non-variables up front. */
6455 {
6458 }
6460 /* If we see a class member here, it should be a static data
6461 member. */
6463 {
6465 /* An in-class declaration of a static data member should be
6466 external; it is only a declaration, and not a definition. */
6471 }
6473 /* We don't create any RTL for local variables. */
6477 /* We defer emission of local statics until the corresponding
6478 DECL_EXPR is expanded. But with constexpr its function might never
6479 be expanded, so go ahead and tell cgraph about the variable now. */
6484 /* Defer template instantiations. */
6489 /* If we're not deferring, go ahead and assemble the variable. */
6492 }
6494 /* walk_tree helper for wrap_temporary_cleanups, below. */
6496 static tree
6498 {
6499 /* Stop at types or full-expression boundaries. */
6502 {
6505 }
6508 {
6513 /* Tell honor_protect_cleanup_actions to handle this as a separate
6514 cleanup. */
6518 }
6521 }
6523 /* We're initializing a local variable which has a cleanup GUARD. If there
6524 are any temporaries used in the initializer INIT of this variable, we
6525 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
6526 variable will be cleaned up properly if one of them throws.
6528 Unfortunately, there's no way to express this properly in terms of
6529 nesting, as the regions for the temporaries overlap the region for the
6530 variable itself; if there are two temporaries, the variable needs to be
6531 the first thing destroyed if either of them throws. However, we only
6532 want to run the variable's cleanup if it actually got constructed. So
6533 we need to guard the temporary cleanups with the variable's cleanup if
6534 they are run on the normal path, but not if they are run on the
6535 exceptional path. We implement this by telling
6536 honor_protect_cleanup_actions to strip the variable cleanup from the
6537 exceptional path. */
6539 static void
6541 {
6543 }
6545 /* Generate code to initialize DECL (a local variable). */
6547 static void
6549 {
6551 tree cleanup;
6559 {
6560 /* If we used it already as memory, it must stay in memory. */
6564 }
6569 /* Compute and store the initial value. */
6574 /* Generate a cleanup, if necessary. */
6577 /* Perform the initialization. */
6579 {
6583 {
6584 /* Stick simple initializers in DECL_INITIAL so that
6585 -Wno-init-self works (c++/34772). */
6590 {
6594 OPT_Winit_self,
6596 }
6597 }
6598 else
6599 {
6602 /* If we're only initializing a single object, guard the
6603 destructors of any temporaries used in its initializer with
6604 its destructor. This isn't right for arrays because each
6605 element initialization is a full-expression. */
6614 saved_stmts_are_full_exprs_p;
6615 }
6616 }
6618 /* Set this to 0 so we can tell whether an aggregate which was
6619 initialized was ever used. Don't do this if it has a
6620 destructor, so we don't complain about the 'resource
6621 allocation is initialization' idiom. Now set
6622 attribute((unused)) on types so decls of that type will be
6623 marked used. (see TREE_USED, above.) */
6625 && ! already_used
6634 }
6636 /* DECL is a VAR_DECL for a compiler-generated variable with static
6637 storage duration (like a virtual table) whose initializer is a
6638 compile-time constant. Initialize the variable and provide it to the
6639 back end. */
6641 void
6643 {
6644 tree init;
6654 }
6656 /* INIT is the initializer for a variable, as represented by the
6657 parser. Returns true iff INIT is type-dependent. */
6659 static bool
6661 {
6663 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
6666 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
6667 {
6680 }
6681 else
6682 /* It must be a simple expression, e.g., int i = 3; */
6686 }
6688 /* INIT is the initializer for a variable, as represented by the
6689 parser. Returns true iff INIT is value-dependent. */
6691 static bool
6693 {
6695 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
6698 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
6699 {
6709 }
6710 else
6711 /* It must be a simple expression, e.g., int i = 3; */
6715 }
6717 // Returns true if a DECL is VAR_DECL with the concept specifier.
6720 {
6722 // Not all variables have DECL_LANG_SPECIFIC.
6725 }
6727 /* A helper function to be called via walk_tree. If any label exists
6728 under *TP, it is (going to be) forced. Set has_forced_label_in_static. */
6730 static tree
6732 {
6738 }
6740 /* Finish processing of a declaration;
6741 install its line number and initial value.
6742 If the length of an array type is not known before,
6743 it must be determined now, from the initial value, or it is an error.
6745 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
6746 true, then INIT is an integral constant expression.
6748 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
6749 if the (init) syntax was used. */
6751 void
6754 {
6755 tree type;
6760 tree auto_node;
6765 {
6769 }
6772 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
6779 /* Warn about register storage specifiers except when in GNU global
6780 or local register variable extension. */
6782 {
6785 "ISO C++1z does not allow %<register%> storage "
6787 else
6790 }
6792 /* If a name was specified, get the string. */
6807 {
6808 tree d_init;
6810 {
6814 {
6815 /* init is null because we're deferring instantiating the
6816 initializer until we need it. Well, we need it now. */
6819 }
6822 }
6825 {
6829 tf_warning_or_error);
6831 }
6841 {
6846 }
6848 }
6859 {
6860 tree clone;
6862 {
6863 /* FIXME check this is 1st decl. */
6868 {
6872 }
6874 }
6876 {
6879 else
6881 }
6882 }
6885 {
6887 /* If DECL is a reference, then we want to know whether init is a
6888 reference constant; init_const_expr_p as passed tells us whether
6889 it's an rvalue constant. */
6893 {
6894 /* Set these flags now for templates. We'll update the flags in
6895 store_init_value for instantiations. */
6898 /* FIXME setting TREE_CONSTANT on refs breaks the back end. */
6901 }
6902 }
6905 {
6908 /* Add this declaration to the statement-tree. */
6915 {
6918 }
6920 /* Generally, initializers in templates are expanded when the
6921 template is instantiated. But, if DECL is a variable constant
6922 then it can be used in future constant expressions, so its value
6923 must be available. */
6928 && init_const_expr_p
6933 {
6934 /* This variable seems to be a non-dependent constant, so process
6935 its initializer. If check_initializer returns non-null the
6936 initialization wasn't constant after all. */
6937 tree init_code;
6943 }
6947 {
6948 /* Deduce array size even if the initializer is dependent. */
6950 /* And complain about multiple initializers. */
6954 tf_warning_or_error);
6955 }
6960 }
6962 /* Just store non-static data member initializers for later. */
6966 /* Take care of TYPE_DECLs up front. */
6968 {
6971 {
6975 }
6977 /* If we have installed this as the canonical typedef for this
6978 type, and that type has not been defined yet, delay emitting
6979 the debug information for it, as we will emit it later. */
6985 at_eof);
6987 }
6989 /* A reference will be modified here, as it is initialized. */
6993 {
6996 }
6999 {
7000 /* If this is a local variable that will need a mangled name,
7001 register it now. We must do this before processing the
7002 initializer for the variable, since the initialization might
7003 require a guard variable, and since the mangled name of the
7004 guard variable will depend on the mangled name of this
7005 variable. */
7009 {
7011 /* Normally has_forced_label_in_static is set during GIMPLE
7012 lowering, but [cd]tors are never actually compiled directly.
7013 We need to set this early so we can deal with the label
7014 address extension. */
7018 {
7021 }
7022 /* And make sure it's in the symbol table for
7023 c_parse_final_cleanups to find. */
7025 }
7027 /* Convert the initializer to the type of DECL, if we have not
7028 already initialized DECL. */
7030 /* If !DECL_EXTERNAL then DECL is being defined. In the
7031 case of a static data member initialized inside the
7032 class-specifier, there can be an initializer even if DECL
7033 is *not* defined. */
7035 {
7039 /* Handle:
7041 [dcl.init]
7043 The memory occupied by any object of static storage
7044 duration is zero-initialized at program startup before
7045 any other initialization takes place.
7047 We cannot create an appropriate initializer until after
7048 the type of DECL is finalized. If DECL_INITIAL is set,
7049 then the DECL is statically initialized, and any
7050 necessary zero-initialization has already been performed. */
7055 /* Remember that the initialization for this variable has
7056 taken place. */
7058 /* This declaration is the definition of this variable,
7059 unless we are initializing a static data member within
7060 the class specifier. */
7063 }
7064 /* If the variable has an array type, lay out the type, even if
7065 there is no initializer. It is valid to index through the
7066 array, and we must get TYPE_ALIGN set correctly on the array
7067 type. */
7074 /* So decl is a global variable or a static member of a
7075 non local class. Record the types it uses
7076 so that we can decide later to emit debug info for them. */
7078 }
7080 /* Add this declaration to the statement-tree. This needs to happen
7081 after the call to check_initializer so that the DECL_EXPR for a
7082 reference temp is added before the DECL_EXPR for the reference itself. */
7084 {
7085 /* If we're building a variable sized type, and we might be
7086 reachable other than via the top of the current binding
7087 level, then create a new BIND_EXPR so that we deallocate
7088 the object at the right time. */
7093 {
7094 tree bind;
7099 }
7101 }
7103 /* Let the middle end know about variables and functions -- but not
7104 static data members in uninstantiated class templates. */
7106 {
7108 {
7111 }
7113 /* This needs to happen after the linkage is set. */
7117 {
7118 /* If a TREE_READONLY variable needs initialization
7119 at runtime, it is no longer readonly and we need to
7120 avoid MEM_READONLY_P being set on RTL created for it. */
7122 {
7126 }
7130 /* Likewise if it needs destruction. */
7133 }
7137 /* Check for abstractness of the type. Notice that there is no
7138 need to strip array types here since the check for those types
7139 is already done within create_array_type_for_decl. */
7143 /* No initialization required. */
7144 ;
7146 {
7148 {
7150 {
7151 /* An out-of-class default definition is defined at
7152 the point where it is explicitly defaulted. */
7157 }
7158 else
7160 }
7161 /* else no initialization required. */
7162 }
7166 {
7169 }
7170 /* A variable definition. */
7172 /* Initialize the local variable. */
7175 /* If a variable is defined, and then a subsequent
7176 definition with external linkage is encountered, we will
7177 get here twice for the same variable. We want to avoid
7178 calling expand_static_init more than once. For variables
7179 that are not static data members, we can call
7180 expand_static_init only when we actually process the
7181 initializer. It is not legal to redeclare a static data
7182 member, so this issue does not arise in that case. */
7185 }
7187 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
7188 reference, insert it in the statement-tree now. */
7190 {
7195 }
7201 }
7203 /* For class TYPE return itself or some its bases that contain
7204 any direct non-static data members. Return error_mark_node if an
7205 error has been diagnosed. */
7207 static tree
7209 {
7217 {
7221 else
7226 }
7228 {
7236 }
7237 else
7247 {
7252 {
7254 {
7259 }
7263 /* OK, found the same base along another path. We'll complain
7266 {
7268 "classes %qT and %qT have non-static data "
7271 }
7272 else
7274 }
7275 }
7277 }
7279 /* Return std::tuple_size<TYPE>::value. */
7281 static tree
7283 {
7299 else
7301 }
7303 /* Return std::tuple_element<I,TYPE>::type. */
7305 static tree
7307 {
7315 tf_warning_or_error);
7318 }
7320 /* Return e.get<i>() or get<i>(e). */
7322 static tree
7324 {
7332 /* [The id-expression] e is an lvalue if the type of the entity e is an
7333 lvalue reference and an xvalue otherwise. */
7341 {
7346 }
7347 else
7348 {
7354 }
7355 }
7357 /* It's impossible to recover the decltype of a tuple decomposition variable
7358 based on the actual type of the variable, so store it in a hash table. */
7360 static void
7362 {
7366 }
7368 tree
7370 {
7372 }
7374 /* Finish a decomposition declaration. DECL is the underlying declaration
7375 "e", FIRST is the head of a chain of decls for the individual identifiers
7376 chained through DECL_CHAIN in reverse order and COUNT is the number of
7377 those decls. */
7379 void
7381 {
7383 {
7384 error_out:
7386 {
7389 {
7392 }
7394 }
7398 }
7402 /* This happens for range for when not in templates.
7403 Still add the DECL_VALUE_EXPRs for later processing. */
7404 || (!processing_template_decl
7406 {
7408 {
7410 {
7416 }
7418 {
7421 }
7423 }
7425 }
7431 {
7435 }
7441 {
7442 /* If e is a constant reference, use the referent directly. */
7447 }
7452 {
7453 tree nelts;
7458 {
7461 }
7464 {
7465 cnt_mismatch:
7469 else
7473 }
7476 {
7482 NULL_TREE);
7485 }
7486 }
7487 /* 2 GNU extensions. */
7489 {
7495 {
7501 t);
7504 }
7505 }
7507 {
7513 {
7521 NULL_TREE);
7524 }
7525 }
7527 {
7529 {
7533 }
7538 {
7549 {
7553 }
7554 /* Save the decltype away before reference collapse. */
7560 {
7561 /* In this case the names are variables, not just proxies. */
7564 }
7567 }
7568 }
7570 {
7573 }
7575 {
7578 }
7580 {
7583 }
7584 else
7585 {
7590 {
7594 }
7598 else
7599 eltscnt++;
7604 {
7608 }
7613 else
7614 {
7616 NULL_TREE);
7623 i++;
7624 }
7625 }
7628 }
7630 /* Returns a declaration for a VAR_DECL as if:
7632 extern "C" TYPE NAME;
7634 had been seen. Used to create compiler-generated global
7635 variables. */
7637 static tree
7639 {
7640 tree decl;
7647 /* If the user has explicitly declared this variable (perhaps
7648 because the code we are compiling is part of a low-level runtime
7649 library), then it is possible that our declaration will be merged
7650 with theirs by pushdecl. */
7656 }
7658 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
7659 if "__cxa_atexit" is not being used) corresponding to the function
7660 to be called when the program exits. */
7662 static tree
7664 {
7665 tree fn_type;
7668 {
7669 tree arg_type;
7672 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
7674 else
7675 /* The parameter to "atexit" is "void (*)(void)". */
7681 }
7684 }
7686 /* Returns a pointer to the `atexit' function. Note that if
7687 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
7688 `__cxa_atexit' function specified in the IA64 C++ ABI. */
7690 static tree
7692 {
7693 tree atexit_fndecl;
7694 tree fn_type;
7695 tree fn_ptr_type;
7703 {
7704 /* The declaration for `__cxa_atexit' is:
7706 int __cxa_atexit (void (*)(void *), void *, void *)
7708 We build up the argument types and then the function type
7709 itself. */
7713 /* First, build the pointer-to-function type for the first
7714 argument. */
7716 /* Then, build the rest of the argument types. */
7719 {
7722 }
7723 else
7724 {
7727 }
7728 /* And the final __cxa_atexit type. */
7731 NULL_TREE);
7734 else
7736 }
7737 else
7738 {
7739 /* The declaration for `atexit' is:
7741 int atexit (void (*)());
7743 We build up the argument types and then the function type
7744 itself. */
7746 /* Build the final atexit type. */
7750 }
7752 /* Now, build the function declaration. */
7760 }
7762 /* Like get_atexit_node, but for thread-local cleanups. */
7764 static tree
7766 {
7767 /* The declaration for `__cxa_thread_atexit' is:
7769 int __cxa_thread_atexit (void (*)(void *), void *, void *) */
7773 NULL_TREE);
7775 /* Now, build the function declaration. */
7779 }
7781 /* Returns the __dso_handle VAR_DECL. */
7783 static tree
7785 {
7789 /* Declare the variable. */
7791 ptr_type_node);
7793 #ifdef HAVE_GAS_HIDDEN
7795 {
7798 }
7799 #endif
7802 }
7804 /* Begin a new function with internal linkage whose job will be simply
7805 to destroy some particular variable. */
7809 static tree
7811 {
7813 tree fntype;
7814 tree fndecl;
7820 /* No need to mangle this. */
7823 /* Build the name of the function. */
7825 /* Build the function declaration. */
7828 /* It's a function with internal linkage, generated by the
7829 compiler. */
7832 /* Make the function `inline' so that it is only emitted if it is
7833 actually needed. It is unlikely that it will be inlined, since
7834 it is only called via a function pointer, but we avoid unnecessary
7835 emissions this way. */
7838 /* Build the parameter. */
7840 {
7841 tree parmdecl;
7848 }
7856 }
7858 /* Finish the cleanup function begun by start_cleanup_fn. */
7860 static void
7862 {
7866 }
7868 /* Generate code to handle the destruction of DECL, an object with
7869 static storage duration. */
7871 tree
7873 {
7874 tree cleanup;
7875 tree addr;
7876 tree compound_stmt;
7877 tree fcall;
7878 tree type;
7881 tree atex_node;
7887 /* If we're using "__cxa_atexit" (or "__cxa_thread_atexit" or
7888 "__aeabi_atexit"), and DECL is a class object, we can just pass the
7889 destructor to "__cxa_atexit"; we don't have to build a temporary
7890 function to do the cleanup. */
7891 dso_parm = (flag_use_cxa_atexit
7896 {
7899 /* Find the destructor. */
7903 /* Make sure it is accessible. */
7905 tf_warning_or_error);
7906 }
7907 else
7908 {
7909 /* Call build_cleanup before we enter the anonymous function so
7910 that any access checks will be done relative to the current
7911 scope, rather than the scope of the anonymous function. */
7914 /* Now start the function. */
7917 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
7918 to the original function, rather than the anonymous one. That
7919 will make the back end think that nested functions are in use,
7920 which causes confusion. */
7925 /* Create the body of the anonymous function. */
7930 }
7932 /* Call atexit with the cleanup function. */
7938 else
7942 {
7943 /* We must convert CLEANUP to the type that "__cxa_atexit"
7944 expects. */
7946 /* "__cxa_atexit" will pass the address of DECL to the
7947 cleanup function. */
7950 /* The declared type of the parameter to "__cxa_atexit" is
7951 "void *". For plain "T*", we could just let the
7952 machinery in cp_build_function_call convert it -- but if the
7953 type is "cv-qualified T *", then we need to convert it
7954 before passing it in, to avoid spurious errors. */
7956 }
7957 else
7958 /* Since the cleanup functions we build ignore the address
7959 they're given, there's no reason to pass the actual address
7960 in, and, in general, it's cheaper to pass NULL than any
7961 other value. */
7966 tf_warning_or_error);
7968 /* Just pass NULL to the dso handle parm if we don't actually
7969 have a DSO handle on this target. */
7971 else
7975 {
7978 {
7981 }
7982 else
7983 {
7986 }
7987 }
7988 else
7989 {
7992 }
7995 }
7997 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
7998 is its initializer. Generate code to handle the construction
7999 and destruction of DECL. */
8001 static void
8003 {
8007 /* Some variables require no dynamic initialization. */
8009 {
8010 /* Make sure the destructor is callable. */
8014 }
8018 {
8022 else
8027 {
8029 "C++11 %<thread_local%> allows dynamic initialization "
8032 }
8034 }
8037 {
8038 /* Emit code to perform this initialization but once. */
8043 /* We don't need thread-safety code for thread-local vars. */
8047 /* Emit code to perform this initialization but once. This code
8048 looks like:
8050 static <type> guard;
8051 if (!__atomic_load (guard.first_byte)) {
8052 if (__cxa_guard_acquire (&guard)) {
8053 bool flag = false;
8054 try {
8055 // Do initialization.
8056 flag = true; __cxa_guard_release (&guard);
8057 // Register variable for destruction at end of program.
8058 } catch {
8059 if (!flag) __cxa_guard_abort (&guard);
8060 }
8061 }
8062 }
8064 Note that the `flag' variable is only set to 1 *after* the
8065 initialization is complete. This ensures that an exception,
8066 thrown during the construction, will cause the variable to
8067 reinitialized when we pass through this code again, as per:
8069 [stmt.dcl]
8071 If the initialization exits by throwing an exception, the
8072 initialization is not complete, so it will be tried again
8073 the next time control enters the declaration.
8075 This process should be thread-safe, too; multiple threads
8076 should not be able to initialize the variable more than
8077 once. */
8079 /* Create the guard variable. */
8082 /* Begin the conditional initialization. */
8089 {
8102 acquire_fn = push_library_fn
8105 NULL_TREE),
8110 NULL_TREE);
8120 inner_if_stmt);
8128 void_node,
8132 /* Do the initialization itself. */
8134 init = add_stmt_to_compound
8136 init = add_stmt_to_compound
8138 }
8139 else
8142 /* Use atexit to register a function for destroying this static
8143 variable. */
8149 {
8153 }
8158 }
8161 else
8163 }
8165 \f
8166 /* Make TYPE a complete type based on INITIAL_VALUE.
8167 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
8168 2 if there was no information (in which case assume 0 if DO_DEFAULT),
8169 3 if the initializer list is empty (in pedantic mode). */
8171 int
8173 {
8177 /* Don't get confused by a CONSTRUCTOR for some other type. */
8184 {
8186 tree value;
8188 /* An array of character type can be initialized from a
8189 brace-enclosed string constant.
8191 FIXME: this code is duplicated from reshape_init. Probably
8192 we should just call reshape_init here? */
8196 {
8203 }
8205 /* If any of the elements are parameter packs, we can't actually
8206 complete this type now because the array size is dependent. */
8208 {
8211 {
8214 }
8215 }
8216 }
8220 /* We can create the array before the element type is complete, which
8221 means that we didn't have these two bits set in the original type
8222 either. In completing the type, we are expected to propagate these
8223 bits. See also complete_type which does the same thing for arrays
8224 of fixed size. */
8227 {
8232 }
8235 }
8237 /* As above, but either give an error or reject zero-size arrays, depending
8238 on COMPLAIN. */
8240 int
8243 {
8246 /* In SFINAE context we can't be lenient about zero-size arrays. */
8253 {
8259 {
8262 }
8266 }
8268 }
8269 \f
8270 /* Return zero if something is declared to be a member of type
8271 CTYPE when in the context of CUR_TYPE. STRING is the error
8272 message to print in that case. Otherwise, quietly return 1. */
8274 static int
8276 {
8278 {
8281 else
8284 }
8286 }
8287 \f
8288 /* Subroutine of `grokdeclarator'. */
8290 /* Generate errors possibly applicable for a given set of specifiers.
8291 This is for ARM $7.1.2. */
8293 static void
8301 {
8303 {
8340 }
8344 && !flag_noexcept_type
8350 }
8352 /* DECL is a member function or static data member and is presently
8353 being defined. Check that the definition is taking place in a
8354 valid namespace. */
8356 static void
8358 {
8359 /* These checks only apply to member functions and static data
8360 members. */
8362 /* We check for problems with specializations in pt.c in
8363 check_specialization_namespace, where we can issue better
8364 diagnostics. */
8367 /* We check this in check_explicit_instantiation_namespace. */
8370 /* [class.mfct]
8372 A member function definition that appears outside of the
8373 class definition shall appear in a namespace scope enclosing
8374 the class definition.
8376 [class.static.data]
8378 The definition for a static data member shall appear in a
8379 namespace scope enclosing the member's class definition. */
8383 }
8385 /* Build a PARM_DECL for the "this" parameter. TYPE is the
8386 METHOD_TYPE for a non-static member function; QUALS are the
8387 cv-qualifiers that apply to the function. */
8389 tree
8391 {
8392 tree this_type;
8393 tree qual_type;
8394 tree parm;
8395 cp_cv_quals this_quals;
8398 {
8399 this_type
8402 }
8403 else
8405 /* The `this' parameter is implicitly `const'; it cannot be
8406 assigned to. */
8412 }
8414 /* DECL is a static member function. Complain if it was declared
8415 with function-cv-quals. */
8417 static void
8419 {
8422 decl);
8423 }
8425 // Check that FN takes no arguments and returns bool.
8426 static void
8428 {
8429 // A constraint is nullary.
8433 // The declared return type of the concept shall be bool, and
8434 // it shall not be deduced from it definition.
8440 }
8442 /* Helper function. Replace the temporary this parameter injected
8443 during cp_finish_omp_declare_simd with the real this parameter. */
8445 static tree
8447 {
8456 }
8458 /* CTYPE is class type, or null if non-class.
8459 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
8460 or METHOD_TYPE.
8461 DECLARATOR is the function's name.
8462 PARMS is a chain of PARM_DECLs for the function.
8463 VIRTUALP is truthvalue of whether the function is virtual or not.
8464 FLAGS are to be passed through to `grokclassfn'.
8465 QUALS are qualifiers indicating whether the function is `const'
8466 or `volatile'.
8467 RAISES is a list of exceptions that this function can raise.
8468 CHECK is 1 if we must find this method in CTYPE, 0 if we should
8469 not look, and -1 if we should not call `grokclassfn' at all.
8471 SFK is the kind of special function (if any) for the new function.
8473 Returns `NULL_TREE' if something goes wrong, after issuing
8474 applicable error messages. */
8476 static tree
8478 tree type,
8479 tree declarator,
8480 tree parms,
8481 tree orig_declarator,
8482 tree decl_reqs,
8485 cp_cv_quals quals,
8486 cp_ref_qualifier rqual,
8487 tree raises,
8493 special_function_kind sfk,
8496 tree in_namespace,
8498 location_t location)
8499 {
8500 tree decl;
8502 tree t;
8504 // Was the concept specifier present?
8507 // Concept declarations must have a corresponding definition.
8509 {
8512 }
8521 /* Set the constraints on the declaration. */
8523 {
8528 /* Adjust the required expression into a constraint. */
8534 }
8536 /* If we have an explicit location, use it, otherwise use whatever
8537 build_lang_decl used (probably input_location). */
8542 {
8543 tree parm;
8548 /* Allocate space to hold the vptr bit if needed. */
8550 }
8554 /* Propagate volatile out from type to decl. */
8558 /* Setup decl according to sfk. */
8560 {
8571 }
8575 {
8577 error
8579 orig_declarator);
8580 else
8581 {
8586 {
8587 /* Something like `template <class T> friend void f<T>()'. */
8590 orig_declarator);
8592 }
8595 /* A friend declaration of the form friend void f<>(). Record
8596 the information in the TEMPLATE_ID_EXPR. */
8605 {
8608 decl);
8610 }
8613 {
8616 decl);
8618 }
8619 }
8620 }
8622 /* If this decl has namespace scope, set that up. */
8628 /* `main' and builtins have implicit 'C' linkage. */
8641 /* Should probably propagate const out from type to decl I bet (mrs). */
8643 {
8646 }
8652 {
8656 }
8659 {
8670 }
8672 /* Members of anonymous types and local classes have no linkage; make
8673 them internal. If a typedef is made later, this will be changed. */
8679 {
8680 /* [basic.link]: A name with no linkage (notably, the name of a class
8681 or enumeration declared in a local scope) shall not be used to
8682 declare an entity with linkage.
8684 DR 757 relaxes this restriction for C++0x. */
8686 }
8690 {
8693 }
8695 /* If the declaration was declared inline, mark it as such. */
8697 {
8701 }
8705 // If the concept declaration specifier was found, check
8706 // that the declaration satisfies the necessary requirements.
8708 {
8711 }
8715 {
8718 TYPE_UNQUALIFIED,
8719 REF_QUAL_NONE);
8722 {
8726 decl);
8728 }
8731 {
8735 decl);
8737 }
8738 }
8741 {
8743 {
8747 }
8751 }
8756 {
8760 /* [over.literal]/6: Literal operators shall not have C linkage. */
8762 {
8765 }
8768 {
8771 {
8774 }
8778 {
8782 }
8784 {
8788 }
8789 }
8790 else
8791 {
8794 }
8795 }
8798 /* Make the init_value nonzero so pushdecl knows this is not
8799 tentative. error_mark_node is replaced later with the BLOCK. */
8806 {
8807 /* Adjust "omp declare simd" attributes. */
8810 {
8811 tree attr;
8814 {
8819 {
8821 cl = c_omp_declare_simd_clauses_to_numbers
8825 else
8827 }
8828 }
8829 }
8830 }
8832 /* Caller will do the rest of this. */
8839 /* 12.4/3 */
8847 template_count,
8858 {
8861 }
8863 /* Check main's type after attributes have been applied. */
8865 {
8867 integer_type_node))
8868 {
8870 tree newtype;
8874 }
8877 }
8880 {
8882 (processing_template_decl
8884 ? current_template_parms
8891 {
8892 tree ok;
8893 tree pushed_scope;
8896 /* Because grokfndecl is always supposed to return a
8897 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
8898 here. We depend on our callers to figure out that its
8899 really a template that's being returned. */
8904 {
8905 /* Remove the `this' parm added by grokclassfn. */
8908 }
8910 {
8913 }
8915 {
8920 }
8922 /* Since we've smashed OLD_DECL to its
8923 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
8927 /* Attempt to merge the declarations. This can fail, in
8928 the case of some invalid specialization declarations. */
8934 {
8938 }
8942 }
8943 }
8955 }
8957 /* decl is a FUNCTION_DECL.
8958 specifiers are the parsed virt-specifiers.
8960 Set flags to reflect the virt-specifiers.
8962 Returns decl. */
8964 static tree
8966 {
8974 }
8976 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
8977 the linkage that DECL will receive in the object file. */
8979 static void
8981 {
8982 /* A static data member always has static storage duration and
8983 external linkage. Note that static data members are forbidden in
8984 local classes -- the only situation in which a class has
8985 non-external linkage. */
8988 /* For non-template classes, static data members are always put
8989 out in exactly those files where they are defined, just as
8990 with ordinary namespace-scope variables. */
8993 }
8995 /* Create a VAR_DECL named NAME with the indicated TYPE.
8997 If SCOPE is non-NULL, it is the class type or namespace containing
8998 the variable. If SCOPE is NULL, the variable should is created in
8999 the innermost enclosing scope. */
9001 static tree
9003 tree name,
9004 tree orig_declarator,
9011 tree scope)
9012 {
9013 tree decl;
9014 tree explicit_scope;
9021 /* Compute the scope in which to place the variable, but remember
9022 whether or not that scope was explicitly specified by the user. */
9025 {
9026 /* An explicit "extern" specifier indicates a namespace-scope
9027 variable. */
9032 }
9036 template, we need DECL_LANG_SPECIFIC. */
9038 /* Similarly for namespace-scope variables with language linkage
9039 other than C++. */
9042 /* Similarly for static data members. */
9044 /* Similarly for explicit specializations. */
9045 || (orig_declarator
9048 else
9053 else
9057 {
9060 }
9063 {
9065 /* This function is only called with out-of-class definitions. */
9068 }
9069 /* At top level, either `static' or no s.c. makes a definition
9070 (perhaps tentative), and absence of `static' makes it public. */
9072 {
9075 || ! constp
9076 || volatilep
9079 }
9080 /* Not at top level, only `static' makes a static definition. */
9081 else
9082 {
9085 }
9088 {
9090 {
9094 }
9097 }
9099 /* If the type of the decl has no linkage, make sure that we'll
9100 notice that in mark_used. */
9109 {
9110 /* [basic.link]: A name with no linkage (notably, the name of a class
9111 or enumeration declared in a local scope) shall not be used to
9112 declare an entity with linkage.
9114 DR 757 relaxes this restriction for C++0x. */
9117 }
9118 else
9126 /* Check that the variable can be safely declared as a concept.
9127 Note that this also forbids explicit specializations. */
9129 {
9131 {
9134 }
9135 else
9140 }
9143 {
9147 }
9149 // Handle explicit specializations and instantiations of variable templates.
9155 }
9157 /* Create and return a canonical pointer to member function type, for
9158 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
9160 tree
9162 {
9164 tree t;
9169 /* Make sure that we always have the unqualified pointer-to-member
9170 type first. */
9172 {
9175 }
9177 /* If a canonical type already exists for this type, use it. We use
9178 this method instead of type_hash_canon, because it only does a
9179 simple equality check on the list of field members. */
9186 /* Let the front end know this is a pointer to member function. */
9193 delta_type_node);
9199 /* Zap out the name so that the back end will give us the debugging
9200 information for this anonymous RECORD_TYPE. */
9203 /* Cache this pointer-to-member type so that we can find it again
9204 later. */
9213 }
9215 /* Create and return a pointer to data member type. */
9217 tree
9219 {
9221 {
9226 }
9227 else
9228 {
9231 }
9232 }
9234 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
9235 Check to see that the definition is valid. Issue appropriate error
9236 messages. Return 1 if the definition is particularly bad, or 0
9237 otherwise. */
9239 static int
9241 {
9242 /* Avoid redundant diagnostics on out-of-class definitions. */
9245 /* Can't check yet if we don't know the type. */
9248 /* If DECL is declared constexpr, we'll do the appropriate checks
9249 in check_initializer. Similarly for inline static data members. */
9255 {
9258 "in-class initialization of static data member %q#D of "
9262 "%<constexpr%> needed for in-class initialization of "
9264 else
9266 "in-class initialization of static data member %q#D of "
9269 }
9271 /* Motion 10 at San Diego: If a static const integral data member is
9272 initialized with an integral constant expression, the initializer
9273 may appear either in the declaration (within the class), or in
9274 the definition, but not both. If it appears in the class, the
9275 member is a member constant. The file-scope definition is always
9276 required. */
9278 {
9280 "invalid in-class initialization of static data member "
9282 type);
9284 }
9287 "ISO C++ forbids in-class initialization of non-const "
9289 decl);
9292 "ISO C++ forbids initialization of member constant "
9296 }
9298 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
9299 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
9300 expressions out into temporary variables so that walk_tree doesn't
9301 step into them (c++/15764). */
9303 static tree
9305 {
9309 {
9315 }
9319 }
9321 /* Entry point for the above. */
9323 static void
9325 {
9327 /* Break out any function calls into temporary variables. */
9329 }
9331 /* Reduce a SIZEOF_EXPR to its value. */
9333 tree
9335 {
9336 tree r;
9343 else
9349 }
9351 /* Given the SIZE (i.e., number of elements) in an array, compute
9352 an appropriate index type for the array. If non-NULL, NAME is
9353 the name of the entity being declared. */
9355 tree
9357 {
9358 tree itype;
9365 {
9372 /* In C++98, we mark a non-constant array bound with a magic
9374 else
9375 {
9380 {
9383 {
9389 else
9392 }
9396 }
9403 }
9408 /* The array bound must be an integer type. */
9410 {
9415 else
9419 }
9420 }
9422 /* A type is dependent if it is...an array type constructed from any
9423 dependent type or whose size is specified by a constant expression
9424 that is value-dependent. */
9425 /* We can only call value_dependent_expression_p on integral constant
9426 expressions; treat non-constant expressions as dependent, too. */
9430 {
9431 /* We cannot do any checking for a SIZE that isn't known to be
9432 constant. Just build the index type and mark that it requires
9433 structural equality checks. */
9440 }
9443 {
9448 /* Use the folded result for VLAs, too; it will have resolved
9449 SIZEOF_EXPR. */
9451 }
9453 /* Normally, the array-bound will be a constant. */
9455 {
9456 /* Check to see if the array bound overflowed. Make that an
9457 error, no matter how generous we're being. */
9460 /* An array must have a positive number of elements. */
9462 {
9467 else
9470 }
9471 /* As an extension we allow zero-sized arrays. */
9473 {
9475 /* We must fail if performing argument deduction (as
9476 indicated by the state of complain), so that
9477 another substitution can be found. */
9483 else
9485 }
9486 }
9488 /* We don't allow VLAs at non-function scopes, or during
9489 tentative template substitution. */
9492 {
9495 /* `(int) &fn' is not a valid array bound. */
9498 name);
9499 else
9502 }
9504 {
9507 else
9509 }
9511 {
9515 else
9518 }
9521 /* A variable sized array. */
9523 else
9524 {
9525 HOST_WIDE_INT saved_processing_template_decl;
9527 /* Compute the index of the largest element in the array. It is
9528 one less than the number of elements in the array. We save
9529 and restore PROCESSING_TEMPLATE_DECL so that computations in
9530 cp_build_binary_op will be appropriately folded. */
9534 MINUS_EXPR,
9537 complain),
9538 complain);
9543 {
9544 /* A variable sized array. */
9551 {
9552 /* We have to add 1 -- in the ubsan routine we generate
9553 LE_EXPR rather than LT_EXPR. */
9558 }
9559 }
9560 /* Make sure that there was no overflow when creating to a signed
9561 index type. (For example, on a 32-bit machine, an array with
9562 size 2^32 - 1 is too big.) */
9565 {
9570 }
9571 }
9573 /* Create and return the appropriate index type. */
9576 /* If the index type were dependent, we would have returned early, so
9577 remember that it isn't. */
9581 }
9583 /* Returns the scope (if any) in which the entity declared by
9584 DECLARATOR will be located. If the entity was declared with an
9585 unqualified name, NULL_TREE is returned. */
9587 tree
9589 {
9593 /* If the declarator-id is a SCOPE_REF, the scope in which the
9594 declaration occurs is the first operand. */
9599 /* Otherwise, the declarator is not a qualified name; the entity will
9600 be declared in the current scope. */
9602 }
9604 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
9605 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
9606 with this type. */
9608 static tree
9610 {
9613 /* If things have already gone awry, bail now. */
9617 /* 8.3.4/1: If the type of the identifier of D contains the auto
9618 type-specifier, the program is ill-formed. */
9620 {
9623 }
9625 /* If there are some types which cannot be array elements,
9626 issue an error-message and return. */
9628 {
9632 else
9639 else
9646 else
9653 else
9659 }
9661 /* [dcl.array]
9663 The constant expressions that specify the bounds of the arrays
9664 can be omitted only for the first member of the sequence. */
9666 {
9670 name);
9671 else
9676 }
9678 /* Figure out the index type for the array. */
9682 /* [dcl.array]
9683 T is called the array element type; this type shall not be [...] an
9684 abstract class type. */
9688 }
9690 /* Returns the smallest location != UNKNOWN_LOCATION among the
9691 three stored in LOCATIONS[ds_const], LOCATIONS[ds_volatile],
9692 and LOCATIONS[ds_restrict]. */
9694 static location_t
9696 {
9711 }
9713 /* Check that it's OK to declare a function with the indicated TYPE
9714 and TYPE_QUALS. SFK indicates the kind of special function (if any)
9715 that this function is. OPTYPE is the type given in a conversion
9716 operator declaration, or the class type for a constructor/destructor.
9717 Returns the actual return type of the function; that may be different
9718 than TYPE if an error occurs, or for certain special functions. */
9720 static tree
9722 tree type,
9723 tree optype,
9726 {
9728 {
9738 else
9749 /* We can't use the proper return type here because we run into
9750 problems with ambiguous bases and covariant returns. */
9753 else
9762 "qualifiers are not allowed on declaration of "
9773 "qualifiers are not allowed on declaration of "
9784 }
9787 }
9789 /* A variable or data member (whose unqualified name is IDENTIFIER)
9790 has been declared with the indicated TYPE. If the TYPE is not
9791 acceptable, issue an error message and return a type to use for
9792 error-recovery purposes. */
9794 tree
9796 {
9798 {
9802 {
9805 }
9806 else
9809 }
9812 }
9814 /* Handle declaring DECL as an inline variable. */
9816 static void
9818 {
9821 {
9825 }
9828 "inline variables are only available "
9831 {
9834 }
9835 }
9837 /* Given declspecs and a declarator (abstract or otherwise), determine
9838 the name and type of the object declared and construct a DECL node
9839 for it.
9841 DECLSPECS points to the representation of declaration-specifier
9842 sequence that precedes declarator.
9844 DECL_CONTEXT says which syntactic context this declaration is in:
9845 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
9846 FUNCDEF for a function definition. Like NORMAL but a few different
9847 error messages in each case. Return value may be zero meaning
9848 this definition is too screwy to try to parse.
9849 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
9850 handle member functions (which have FIELD context).
9851 Return value may be zero meaning this definition is too screwy to
9852 try to parse.
9853 PARM for a parameter declaration (either within a function prototype
9854 or before a function body). Make a PARM_DECL, or return void_type_node.
9855 TPARM for a template parameter declaration.
9856 CATCHPARM for a parameter declaration before a catch clause.
9857 TYPENAME if for a typename (in a cast or sizeof).
9858 Don't make a DECL node; just return the ..._TYPE node.
9859 FIELD for a struct or union field; make a FIELD_DECL.
9860 BITFIELD for a field with specified width.
9862 INITIALIZED is as for start_decl.
9864 ATTRLIST is a pointer to the list of attributes, which may be NULL
9865 if there are none; *ATTRLIST may be modified if attributes from inside
9866 the declarator should be applied to the declaration.
9868 When this function is called, scoping variables (such as
9869 CURRENT_CLASS_TYPE) should reflect the scope in which the
9870 declaration occurs, not the scope in which the new declaration will
9871 be placed. For example, on:
9873 void S::f() { ... }
9875 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
9876 should not be `S'.
9878 Returns a DECL (if a declarator is present), a TYPE (if there is no
9879 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
9880 error occurs. */
9882 tree
9888 {
9900 /* True if this declarator is a function definition. */
9904 #if 0
9905 /* See the code below that used this. */
9907 #endif
9909 /* Keep track of what sort of function is being processed
9910 so that we can warn about default return values, or explicit
9911 return values which do not match prescribed defaults. */
9917 /* cv-qualifiers that apply to the declarator, for a declaration of
9918 a member function. */
9920 /* virt-specifiers that apply to the declarator, for a declaration of
9921 a member function. */
9923 /* ref-qualifier that applies to the declarator, for a declaration of
9924 a member function. */
9926 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
9933 /* The unqualified name of the declarator; either an
9934 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
9935 tree unqualified_id;
9936 /* The class type, if any, in which this entity is located,
9937 or NULL_TREE if none. Note that this value may be different from
9938 the current class type; for example if an attempt is made to declare
9939 "A::f" inside "B", this value will be "A". */
9941 /* The NAMESPACE_DECL for the namespace in which this entity is
9942 located. If an unqualified name is used to declare the entity,
9943 this value will be NULL_TREE, even if the entity is located at
9944 namespace scope. */
9946 cp_storage_class storage_class;
9967 // Was concept_p specified? Note that ds_concept
9968 // implies ds_constexpr!
9999 /* Look inside a declarator for the name being declared
10000 and get it as a string, for an error message. */
10002 id_declarator;
10004 {
10009 {
10013 {
10017 }
10021 {
10027 {
10029 {
10030 /* [dcl.meaning]
10032 A declarator-id shall not be qualified except
10033 for ...
10035 None of the cases are permitted in block
10036 scope. */
10039 decl);
10043 else
10047 }
10049 {
10052 {
10055 }
10057 && current_class_type
10059 current_class_type))
10060 {
10064 }
10065 }
10068 }
10070 {
10072 {
10073 tree type;
10076 {
10079 }
10082 {
10085 }
10092 }
10096 {
10101 {
10104 else
10105 {
10108 }
10109 }
10110 }
10111 /* Fall through. */
10118 {
10120 dname);
10122 }
10125 else
10126 {
10132 else
10134 }
10139 }
10141 }
10158 }
10161 }
10163 /* [dcl.fct.edf]
10165 The declarator in a function-definition shall have the form
10166 D1 ( parameter-declaration-clause) ... */
10168 {
10171 }
10176 {
10179 }
10185 {
10188 }
10191 {
10193 {
10196 }
10198 {
10201 }
10202 }
10204 /* Anything declared one level down from the top level
10205 must be one of the parameters of a function
10206 (because the body is at least two levels down). */
10208 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
10209 by not allowing C++ class definitions to specify their parameters
10210 with xdecls (must be spec.d in the parmlist).
10212 Since we now wait to push a class scope until we are sure that
10213 we are in a legitimate method context, we must set oldcname
10214 explicitly (since current_class_name is not yet alive).
10216 We also want to avoid calling this a PARM if it is in a namespace. */
10219 {
10225 }
10231 {
10234 }
10237 {
10240 }
10242 /* If there were multiple types specified in the decl-specifier-seq,
10243 issue an error message. */
10245 {
10248 }
10251 {
10254 }
10256 /* Extract the basic type from the decl-specifier-seq. */
10259 {
10262 }
10263 /* If the entire declaration is itself tagged as deprecated then
10264 suppress reports of deprecated items. */
10269 {
10276 }
10277 /* No type at all: default to `int', and set DEFAULTED_INT
10278 because it was not a user-defined typedef. */
10280 {
10282 {
10283 /* These imply 'int'. */
10286 }
10287 /* If we just have "complex", it is equivalent to "complex double". */
10290 {
10293 "ISO C++ does not support plain %<complex%> meaning "
10295 }
10296 }
10297 /* Gather flags. */
10301 #if 0
10302 /* See the code below that used this. */
10305 #endif
10310 else
10314 {
10316 ctor_return_type,
10317 type_quals,
10320 }
10322 {
10327 /* We handle `main' specially here, because 'main () { }' is so
10328 common. With no options, it is allowed. With -Wreturn-type,
10329 it is a warning. It is only an error with -pedantic-errors. */
10330 is_main = (funcdef_flag
10346 else
10351 /* FIXME we should be able to propagate the error_mark_node as is
10352 for other contexts too. */
10354 else
10356 }
10361 {
10363 {
10367 }
10372 }
10374 /* Now process the modifiers that were specified
10375 and check for invalid combinations. */
10377 /* Long double is a special combination. */
10379 {
10383 }
10385 /* Check all other uses of type modifiers. */
10388 {
10410 {
10415 }
10416 else
10417 {
10420 {
10423 name);
10426 }
10427 }
10429 /* Discard the type modifiers if they are invalid. */
10431 {
10437 }
10438 }
10440 /* Decide whether an integer type is signed or not.
10441 Optionally treat bitfields as signed by default. */
10443 /* [class.bit]
10445 It is implementation-defined whether a plain (neither
10446 explicitly signed or unsigned) char, short, int, or long
10447 bit-field is signed or unsigned.
10449 Naturally, we extend this to long long as well. Note that
10450 this does not include wchar_t. */
10452 && !signed_p
10453 /* A typedef for plain `int' without `signed' can be
10454 controlled just like plain `int', but a typedef for
10455 `signed int' cannot be so controlled. */
10456 && !(typedef_decl
10460 {
10473 else
10475 }
10488 {
10491 /* If a modifier is specified, the resulting complex is the complex
10492 form of TYPE. E.g, "complex short" is "complex short int". */
10501 else
10503 }
10505 /* If we're using the injected-class-name to form a compound type or a
10506 declaration, replace it with the underlying class so we don't get
10507 redundant typedefs in the debug output. But if we are returning the
10508 type unchanged, leave it alone so that it's available to
10509 maybe_get_template_decl_from_type_decl. */
10517 type = cp_build_qualified_type_real
10521 /* We might have ignored or rejected some of the qualifiers. */
10528 {
10532 }
10544 {
10546 {
10551 }
10555 }
10558 /* Issue errors about use of storage classes for parameters. */
10560 {
10562 {
10565 }
10567 {
10570 }
10576 /* Function parameters cannot be concept. */
10579 /* Function parameters cannot be constexpr. If we saw one, moan
10580 and pretend it wasn't there. */
10582 {
10585 }
10586 }
10588 /* Give error if `virtual' is used outside of class declaration. */
10591 {
10595 }
10598 {
10613 declspecs->gnu_thread_keyword_p
10619 {
10644 }
10647 {
10649 {
10653 "type must be cv-qualified %<auto%> or reference to "
10655 }
10658 }
10668 }
10670 /* Static anonymous unions are dealt with here. */
10676 /* Warn about storage classes that are invalid for certain
10677 kinds of declarations (parameters, typenames, etc.). */
10679 && ((storage_class
10683 {
10686 }
10691 {
10695 ;
10697 ;
10699 /* C++ allows static class elements. */
10701 /* C++ also allows inlines and signed and unsigned elements,
10702 but in those cases we don't come in here. */
10703 ;
10704 else
10705 {
10708 else
10709 {
10712 else
10714 }
10720 }
10721 }
10726 {
10729 }
10733 {
10738 /* When thread_local is applied to a variable of block scope the
10739 storage-class-specifier static is implied if it does not appear
10740 explicitly. */
10743 }
10746 {
10750 }
10754 else
10755 {
10758 {
10771 }
10772 }
10775 {
10776 /* Apply the c++11 attributes to the type preceding them. */
10780 }
10782 /* Determine the type of the entity declared by recurring on the
10783 declarator. */
10785 {
10787 tree attrs;
10794 {
10806 attr_flags);
10807 }
10815 {
10823 /* [dcl.array]/1:
10825 The optional attribute-specifier-seq appertains to the
10826 array. */
10832 {
10833 tree arg_types;
10836 /* Declaring a function type.
10837 Make sure we have a valid type for the function to return. */
10840 {
10842 {
10845 }
10846 /* We now know that the TYPE_QUALS don't apply to the
10847 decl, but to its return type. */
10849 }
10851 /* Error about some types functions can't return. */
10854 {
10857 }
10859 {
10862 }
10868 /* Pick up type qualifiers which should be applied to `this'. */
10870 /* Pick up virt-specifiers. */
10872 /* And ref-qualifier, too */
10874 /* And tx-qualifier. */
10876 /* Pick up the exception specifications. */
10878 /* If the exception-specification is ill-formed, let's pretend
10879 there wasn't one. */
10887 /* Say it's a definition only for the CALL_EXPR
10888 closest to the identifier. */
10891 /* Handle a late-specified return type. */
10894 {
10896 {
10898 {
10903 {
10905 "%<auto%> type specifier without trailing "
10908 "only available with -std=c++14 or "
10910 }
10912 {
10916 }
10917 }
10919 {
10924 }
10926 {
10928 {
10931 "for %qT must have trailing return "
10933 else
10936 type);
10939 }
10945 else
10949 }
10950 }
10953 {
10955 /* Not using maybe_warn_cpp0x because this should
10956 always be an error. */
10959 else
10963 }
10964 }
10974 && funcdecl_p
10980 {
10981 /* We are within a class's scope. If our declarator name
10982 is the same as the class name, and we are defining
10983 a function, then it is a constructor/destructor, and
10984 therefore returns a void type. */
10986 /* ISO C++ 12.4/2. A destructor may not be declared
10987 const or volatile. A destructor may not be static.
10988 A destructor may not be declared with ref-qualifier.
10990 ISO C++ 12.1. A constructor may not be declared
10991 const or volatile. A constructor may not be
10992 virtual. A constructor may not be static.
10993 A constructor may not be declared with ref-qualifier. */
10999 {
11004 }
11007 {
11013 }
11017 current_class_type,
11018 flags))
11022 {
11023 /* It's a constructor. */
11027 {
11031 }
11035 }
11038 }
11040 {
11042 {
11043 /* Cannot be both friend and virtual. */
11046 }
11052 name);
11053 }
11055 {
11057 {
11060 }
11063 }
11065 {
11068 }
11077 {
11081 }
11087 {
11089 /* transaction_safe applies to the type, but
11090 transaction_safe_dynamic applies to the function. */
11093 else
11095 }
11097 /* [dcl.fct]/2:
11099 The optional attribute-specifier-seq appertains to
11100 the function type. */
11105 }
11111 /* Filter out pointers-to-references and references-to-references.
11112 We can get these if a TYPE_DECL is used. */
11115 {
11117 {
11120 }
11122 /* In C++0x, we allow reference to reference declarations
11123 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
11124 and template type arguments [14.3.1/4 temp.arg.type]. The
11125 check for direct reference to reference declarations, which
11126 are still forbidden, occurs below. Reasoning behind the change
11127 can be found in DR106, DR540, and the rvalue reference
11128 proposals. */
11130 {
11133 }
11134 }
11136 {
11141 }
11143 /* We now know that the TYPE_QUALS don't apply to the decl,
11144 but to the target of the pointer. */
11147 /* This code used to handle METHOD_TYPE, but I don't think it's
11148 possible to get it here anymore. */
11152 {
11156 memfn_quals,
11157 rqual);
11163 }
11171 type);
11173 /* When the pointed-to type involves components of variable size,
11174 care must be taken to ensure that the size evaluation code is
11175 emitted early enough to dominate all the possible later uses
11176 and late enough for the variables on which it depends to have
11177 been assigned.
11179 This is expected to happen automatically when the pointed-to
11180 type has a name/declaration of it's own, but special attention
11181 is required if the type is anonymous.
11183 We handle the NORMAL and FIELD contexts here by inserting a
11184 dummy statement that just evaluates the size at a safe point
11185 and ensures it is not deferred until e.g. within a deeper
11186 conditional context (c++/43555).
11188 We expect nothing to be needed here for PARM or TYPENAME.
11189 Evaluating the size at this point for TYPENAME would
11190 actually be incorrect, as we might be in the middle of an
11191 expression with side effects on the pointed-to type size
11192 "arguments" prior to the pointer declaration point and the
11193 size evaluation could end up prior to the side effects. */
11199 {
11203 }
11206 {
11207 /* In C++0x, the type we are creating a reference to might be
11208 a typedef which is itself a reference type. In that case,
11209 we follow the reference collapsing rules in
11210 [7.1.3/8 dcl.typedef] to create the final reference type:
11212 "If a typedef TD names a type that is a reference to a type
11213 T, an attempt to create the type 'lvalue reference to cv TD'
11214 creates the type 'lvalue reference to T,' while an attempt
11215 to create the type "rvalue reference to cv TD' creates the
11216 type TD."
11217 */
11221 {
11224 else
11226 }
11227 else
11228 type = cp_build_reference_type
11231 /* In C++0x, we need this check for direct reference to
11232 reference declarations, which are forbidden by
11233 [8.3.2/5 dcl.ref]. Reference to reference declarations
11234 are only allowed indirectly through typedefs and template
11235 type arguments. Example:
11237 void foo(int & &); // invalid ref-to-ref decl
11239 typedef int & int_ref;
11240 void foo(int_ref &); // valid ref-to-ref decl
11241 */
11245 }
11249 {
11253 /* We will already have complained. */
11255 else
11257 type);
11258 }
11259 else
11262 /* Process a list of type modifier keywords (such as
11263 const or volatile) that were given inside the `*' or `&'. */
11266 {
11267 type
11271 }
11273 /* Apply C++11 attributes to the pointer, and not to the
11274 type pointed to. This is unlike what is done for GNU
11275 attributes above. It is to comply with [dcl.ptr]/1:
11277 [the optional attribute-specifier-seq (7.6.1) appertains
11278 to the pointer and not to the object pointed to]. */
11291 }
11292 }
11294 /* A `constexpr' specifier used in an object declaration declares
11295 the object as `const'. */
11297 {
11298 /* DR1688 says that a `constexpr' specifier in combination with
11299 `volatile' is valid. */
11302 {
11305 }
11306 }
11312 {
11314 unqualified_id);
11316 }
11318 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
11319 qualified with a class-name, turn it into a METHOD_TYPE, unless
11320 we know that the function is static. We take advantage of this
11321 opportunity to do other processing that pertains to entities
11322 explicitly declared to be class members. Note that if DECLARATOR
11323 is non-NULL, we know it is a cdk_id declarator; otherwise, we
11324 would not have exited the loop above. */
11329 {
11335 {
11337 {
11341 }
11342 else
11346 }
11348 can skip the following checks. */
11351 qualifying type must certainly be complete. */
11352 funcdef_flag
11353 /* A friend declaration of "T::f" is OK, even if
11354 "T" is a template parameter. But, if this
11355 function is not a friend, the qualifying type
11356 must be a class. */
11358 /* For a declaration, the type need not be
11359 complete, if either it is dependent (since there
11360 is no meaningful definition of complete in that
11361 case) or the qualifying class is currently being
11362 defined. */
11365 /* Check that the qualifying type is complete. */
11369 {
11372 {
11380 }
11381 }
11383 {
11387 }
11388 }
11393 /* Now TYPE has the actual type. */
11396 {
11399 else
11401 }
11406 /* [dcl.meaning]/1: The optional attribute-specifier-seq following
11407 a declarator-id appertains to the entity that is declared. */
11410 /* Handle parameter packs. */
11412 {
11414 /* Turn the type into a pack expansion.*/
11416 else
11418 }
11421 && !processing_template_decl
11423 {
11426 else
11429 }
11432 {
11433 /* [dcl.fct.spec] (C++11) The explicit specifier shall be used only
11434 in the declaration of a constructor or conversion function within
11435 a class definition. */
11442 else
11444 "only declarations of constructors and conversion operators "
11447 }
11450 {
11452 {
11455 }
11457 {
11460 }
11463 {
11466 }
11468 {
11471 }
11473 {
11476 }
11478 {
11482 }
11483 }
11485 /* If this is declaring a typedef name, return a TYPE_DECL. */
11487 {
11488 tree decl;
11490 /* This declaration:
11492 typedef void f(int) const;
11494 declares a function type which is not a member of any
11495 particular class, but which is cv-qualified; for
11496 example "f S::*" declares a pointer to a const-qualified
11497 member function of S. We record the cv-qualification in the
11498 function type. */
11500 {
11503 /* We have now dealt with these qualifiers. */
11506 }
11509 {
11512 }
11519 else
11525 }
11528 {
11532 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
11534 /* The TYPE_DECL is "abstract" because there will be
11535 clones of this constructor/destructor, and there will
11536 be copies of this TYPE_DECL generated in those
11537 clones. The decloning optimization (for space) may
11538 revert this subsequently if it determines that
11539 the clones should share a common implementation. */
11541 }
11546 unqualified_id);
11548 /* If the user declares "typedef struct {...} foo" then the
11549 struct will have an anonymous name. Fill that name in now.
11550 Nothing can refer to it, so nothing needs know about the name
11551 change. */
11553 && unqualified_id
11560 {
11561 tree t;
11563 /* Replace the anonymous name with the real name everywhere. */
11565 {
11567 /* We do not rename the debug info representing the
11568 unnamed tagged type because the standard says in
11569 [dcl.typedef] that the naming applies only for
11570 linkage purposes. */
11571 /*debug_hooks->set_name (t, decl);*/
11573 }
11578 /* If this is a typedef within a template class, the nested
11579 type is a (non-primary) template. The name for the
11580 template needs updating as well. */
11585 /* Adjust linkage now that we aren't unnamed anymore. */
11588 /* FIXME remangle member functions; member functions of a
11589 type with external linkage have external linkage. */
11590 }
11601 /* Acknowledge that this was written:
11602 `using analias = atype;'. */
11606 }
11608 /* Detect the case of an array type of unspecified size
11609 which came, as such, direct from a typedef name.
11610 We must copy the type, so that the array's domain can be
11611 individually set by the object's initializer. */
11618 /* Detect where we're using a typedef of function type to declare a
11619 function. PARMS will not be set, so we must create it now. */
11622 {
11624 tree args;
11629 {
11634 }
11639 {
11640 /* The qualifiers on the function type become the qualifiers on
11641 the non-static member function. */
11645 }
11646 }
11648 /* If this is a type name (such as, in a cast or sizeof),
11649 compute the type and return it now. */
11652 {
11653 /* Note that here we don't care about type_quals. */
11655 /* Special case: "friend class foo" looks like a TYPENAME context. */
11657 {
11659 {
11662 }
11665 {
11666 /* Don't allow friend declaration without a class-key. */
11673 else
11676 type);
11677 }
11679 /* Only try to do this stuff if we didn't already give up. */
11681 {
11682 /* A friendly class? */
11686 else
11688 type);
11691 }
11692 }
11694 {
11701 /* Core issue #547: need to allow this in template type args.
11702 Allow it in general in C++11 for alias-declarations. */
11706 else
11708 }
11714 }
11718 && ! bitfield
11720 {
11723 }
11725 /* Only functions may be declared using an operator-function-id. */
11730 {
11733 }
11740 type);
11742 /* We don't check parameter types here because we can emit a better
11743 error message later. */
11745 {
11749 }
11751 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
11752 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
11755 {
11761 {
11764 else
11767 }
11769 /* A parameter declared as an array of T is really a pointer to T.
11770 One declared as a function is really a pointer to a function.
11771 One declared as a member is really a pointer to member. */
11774 {
11775 /* Transfer const-ness of array into that of type pointed to. */
11779 }
11782 }
11786 {
11792 }
11794 {
11798 {
11805 }
11807 {
11810 {
11816 else
11820 }
11822 /* The C99 flexible array extension. */
11825 {
11829 {
11832 }
11833 else
11834 {
11835 /* Array is a flexible member. */
11837 /* Do not warn on flexible array members in system
11842 else
11846 /* Flexible array member has a null domain. */
11848 }
11849 }
11852 {
11853 /* Happens when declaring arrays of sizes which
11854 are error_mark_node, for example. */
11856 }
11858 {
11859 /* Something like struct S { int N::j; }; */
11862 }
11865 {
11867 tree function_context;
11870 {
11871 /* This should never happen in pure C++ (the check
11872 could be an assert). It could happen in
11873 Objective-C++ if someone writes invalid code that
11874 uses a function declaration for an instance
11875 variable or property (instance variables and
11876 properties are parsed as FIELD_DECLs, but they are
11877 part of an Objective-C class, not a C++ class).
11878 That code is invalid and is caught by this
11879 check. */
11881 {
11883 unqualified_id);
11885 }
11887 /* ``A union may [ ... ] not [ have ] virtual functions.''
11888 ARM 9.5 */
11890 {
11892 unqualified_id);
11894 }
11897 {
11899 {
11902 unqualified_id);
11904 }
11905 }
11906 }
11908 /* Check that the name used for a destructor makes sense. */
11910 {
11914 {
11919 }
11922 {
11926 }
11928 {
11931 }
11933 {
11936 }
11937 }
11939 {
11944 }
11947 {
11950 }
11952 {
11955 }
11958 {
11961 {
11967 }
11968 }
11970 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
11982 parms,
11983 unqualified_id,
11984 reqs,
11994 #if 0
11995 /* This clobbers the attrs stored in `decl' from `attrlist'. */
11996 /* The decl and setting of decl_attr is also turned off. */
11998 #endif
12000 /* [class.conv.ctor]
12002 A constructor declared without the function-specifier
12003 explicit that can be called with a single parameter
12004 specifies a conversion from the type of its first
12005 parameter to the type of its class. Such a constructor
12006 is called a converting constructor. */
12009 }
12014 {
12017 {
12019 {
12023 }
12024 else
12029 }
12030 }
12031 else
12032 {
12034 {
12038 }
12040 }
12043 {
12044 /* Friends are treated specially. */
12048 {
12050 {
12051 decl = check_explicit_specialization
12056 }
12060 funcdef_flag);
12062 }
12063 else
12065 }
12067 /* Structure field. It may not be a function, except for C++. */
12070 {
12072 {
12073 /* C++ allows static class members. All other work
12074 for this is done by grokfield. */
12082 unqualified_id);
12084 {
12088 }
12095 /* Even if there is an in-class initialization, DECL
12096 is considered undefined until an out-of-class
12097 definition is provided, unless this is an inline
12098 variable. */
12102 {
12108 }
12109 }
12110 else
12111 {
12114 unqualified_id);
12116 {
12118 unqualified_id);
12120 }
12128 {
12131 }
12134 {
12135 /* An attempt is being made to initialize a non-static
12136 member. This is new in C++11. */
12139 /* If this has been parsed with static storage class, but
12140 errors forced staticp to be cleared, ensure NSDMI is
12141 not present. */
12144 }
12145 }
12151 }
12152 }
12155 {
12156 tree original_name;
12164 else
12172 {
12175 name);
12176 else
12178 name);
12179 }
12183 /* Function declaration not at top level.
12184 Storage classes other than `extern' are not allowed
12185 and `extern' makes no difference. */
12190 {
12193 "%<static%> specifier invalid for function %qs "
12195 else
12197 "%<inline%> specifier invalid for function %qs "
12199 }
12202 {
12204 {
12207 }
12210 {
12215 }
12216 }
12218 /* Record whether the function is public. */
12228 publicp,
12231 sfk,
12232 funcdef_flag,
12241 {
12244 /* Don't allow a static member function in a class, and forbid
12245 declaring main to be static. */
12247 {
12251 }
12253 {
12254 /* 7.1.1: There can be no static function declarations within a
12255 block. */
12258 }
12261 {
12264 }
12265 }
12266 }
12267 else
12268 {
12269 /* It's a variable. */
12271 /* An uninitialized decl with `extern' is a reference. */
12273 declspecs,
12274 initialized,
12275 type_quals,
12276 inlinep,
12277 concept_p,
12278 template_count,
12288 {
12291 {
12296 }
12298 {
12301 }
12303 {
12305 "cannot explicitly declare member %q#D to have "
12308 }
12309 }
12311 {
12313 decl);
12315 }
12320 {
12326 }
12327 }
12332 {
12336 }
12339 {
12341 {
12342 /* It's common practice (and completely valid) to have a const
12343 be initialized and declared extern. */
12346 }
12347 else
12348 {
12351 }
12352 }
12354 /* Record `register' declaration for warnings on &
12355 and in case doing stupid register allocation. */
12358 {
12360 /* Warn about register storage specifiers on PARM_DECLs. */
12362 {
12365 "ISO C++1z does not allow %<register%> storage "
12367 else
12370 }
12371 }
12377 /* Set constexpr flag on vars (functions got it in grokfndecl). */
12381 /* Record constancy and volatility on the DECL itself . There's
12382 no need to do this when processing a template; we'll do this
12383 for the instantiated declaration based on the type of DECL. */
12388 }
12389 }
12390 \f
12391 /* Subroutine of start_function. Ensure that each of the parameter
12392 types (as listed in PARMS) is complete, as is required for a
12393 function definition. */
12395 static void
12397 {
12399 {
12404 {
12407 }
12408 else
12409 /* grokparms or complete_type_or_else will have already issued
12410 an error. */
12412 }
12413 }
12415 /* Returns nonzero if T is a local variable. */
12417 int
12419 {
12421 /* A VAR_DECL with a context that is a _TYPE is a static data
12422 member. */
12424 /* Any other non-local variable must be at namespace scope. */
12430 }
12432 /* Like local_variable_p, but suitable for use as a tree-walking
12433 function. */
12435 static tree
12438 {
12446 }
12448 /* Check that ARG, which is a default-argument expression for a
12449 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
12450 something goes wrong. DECL may also be a _TYPE node, rather than a
12451 DECL, if there is no DECL available. */
12453 tree
12455 {
12456 tree var;
12457 tree decl_type;
12460 /* We get a DEFAULT_ARG when looking at an in-class declaration
12461 with a default argument. Ignore the argument for now; we'll
12462 deal with it after the class is complete. */
12466 {
12469 }
12470 else
12477 /* Something already went wrong. There's no need to check
12478 further. */
12481 /* [dcl.fct.default]
12483 A default argument expression is implicitly converted to the
12484 parameter type. */
12487 LOOKUP_IMPLICIT);
12490 /* Avoid redundant -Wzero-as-null-pointer-constant warnings at
12491 the call sites. */
12496 /* [dcl.fct.default]
12498 Local variables shall not be used in default argument
12499 expressions.
12501 The keyword `this' shall not be used in a default argument of a
12502 member function. */
12505 {
12507 {
12511 else
12513 }
12515 }
12517 /* All is well. */
12519 }
12521 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
12523 static tree
12525 {
12530 {
12533 else
12535 }
12537 /* Do warn about using typedefs to a deprecated class. */
12549 return type_is_deprecated
12553 }
12555 /* Decode the list of parameter types for a function type.
12556 Given the list of things declared inside the parens,
12557 return a list of types.
12559 If this parameter does not end with an ellipsis, we append
12560 void_list_node.
12562 *PARMS is set to the chain of PARM_DECLs created. */
12564 tree
12566 {
12569 tree parm;
12573 {
12586 {
12588 && !init
12591 /* DR 577: A parameter list consisting of a single
12592 unnamed parameter of non-dependent type 'void'. */
12596 "invalid use of cv-qualified type %qT in "
12598 else
12600 "invalid use of type %<void%> in parameter "
12602 /* It's not a good idea to actually create parameters of
12603 type `void'; other parts of the compiler assume that a
12604 void type terminates the parameter list. */
12607 }
12610 {
12612 {
12616 }
12618 /* Top-level qualifiers on the parameters are
12619 ignored for function types. */
12622 {
12626 }
12630 {
12631 /* [dcl.fct]/6, parameter types cannot contain pointers
12632 (references) to arrays of unknown bound. */
12637 {
12645 }
12653 }
12659 }
12664 }
12672 }
12674 \f
12675 /* D is a constructor or overloaded `operator='.
12677 Let T be the class in which D is declared. Then, this function
12678 returns:
12680 -1 if D's is an ill-formed constructor or copy assignment operator
12681 whose first parameter is of type `T'.
12682 0 if D is not a copy constructor or copy assignment
12683 operator.
12684 1 if D is a copy constructor or copy assignment operator whose
12685 first parameter is a reference to non-const qualified T.
12686 2 if D is a copy constructor or copy assignment operator whose
12687 first parameter is a reference to const qualified T.
12689 This function can be used as a predicate. Positive values indicate
12690 a copy constructor and nonzero values indicate a copy assignment
12691 operator. */
12693 int
12695 {
12696 tree args;
12697 tree arg_type;
12705 /* Instantiations of template member functions are never copy
12706 functions. Note that member functions of templated classes are
12707 represented as template functions internally, and we must
12708 accept those as copy functions. */
12720 {
12721 /* Pass by value copy assignment operator. */
12723 }
12727 {
12730 }
12731 else
12737 /* There are more non-optional args. */
12741 }
12743 /* D is a constructor or overloaded `operator='.
12745 Let T be the class in which D is declared. Then, this function
12746 returns true when D is a move constructor or move assignment
12747 operator, false otherwise. */
12749 bool
12751 {
12755 /* There are no move constructors if we are in C++98 mode. */
12761 /* Instantiations of template member functions are never move
12762 functions. Note that member functions of templated classes are
12763 represented as template functions internally, and we must
12764 accept those as move functions. */
12768 }
12770 /* D is a constructor or overloaded `operator='.
12772 Then, this function returns true when D has the same signature as a move
12773 constructor or move assignment operator (because either it is such a
12774 ctor/op= or it is a template specialization with the same signature),
12775 false otherwise. */
12777 bool
12779 {
12780 tree args;
12781 tree arg_type;
12801 /* There are more non-optional args. */
12805 }
12807 /* Remember any special properties of member function DECL. */
12809 void
12811 {
12812 tree class_type;
12819 {
12826 {
12827 /* [class.copy]
12829 A non-template constructor for class X is a copy
12830 constructor if its first parameter is of type X&, const
12831 X&, volatile X& or const volatile X&, and either there
12832 are no other parameters or else all other parameters have
12833 default arguments. */
12839 }
12850 }
12852 {
12853 /* [class.copy]
12855 A non-template assignment operator for class X is a copy
12856 assignment operator if its parameter is of type X, X&, const
12857 X&, volatile X& or const volatile X&. */
12862 {
12868 }
12871 }
12872 /* Destructors are handled in check_methods. */
12873 }
12875 /* Check a constructor DECL has the correct form. Complains
12876 if the class has a constructor of the form X(X). */
12878 int
12880 {
12884 {
12885 /* [class.copy]
12887 A declaration of a constructor for a class X is ill-formed if
12888 its first parameter is of type (optionally cv-qualified) X
12889 and either there are no other parameters or else all other
12890 parameters have default arguments.
12892 We *don't* complain about member template instantiations that
12893 have this form, though; they can occur as we try to decide
12894 what constructor to use during overload resolution. Since
12895 overload resolution will never prefer such a constructor to
12896 the non-template copy constructor (which is either explicitly
12897 or implicitly defined), there's no need to worry about their
12898 existence. Theoretically, they should never even be
12899 instantiated, but that's hard to forestall. */
12903 }
12906 }
12908 /* An operator with this code is unary, but can also be binary. */
12910 static int
12912 {
12919 }
12921 /* An operator with this name can only be unary. */
12923 static int
12925 {
12930 }
12932 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
12933 errors are issued for invalid declarations. */
12935 bool
12937 {
12939 tree argtype;
12945 tree class_type;
12947 /* Count the number of arguments and check for ellipsis. */
12960 else
12961 do
12962 {
12963 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
12964 if (cp_operator_id (CODE) == name) \
12965 { \
12966 operator_code = (CODE); \
12967 break; \
12968 } \
12969 else if (cp_assignment_operator_id (CODE) == name) \
12970 { \
12971 operator_code = (CODE); \
12972 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
12973 break; \
12974 }
12977 #undef DEF_OPERATOR
12980 }
12987 {
13006 }
13008 /* [basic.std.dynamic.allocation]/1:
13010 A program is ill-formed if an allocation function is declared
13011 in a namespace scope other than global scope or declared static
13012 in global scope.
13014 The same also holds true for deallocation functions. */
13017 {
13019 {
13021 {
13024 }
13026 {
13029 }
13030 }
13031 }
13034 {
13037 }
13040 else
13041 {
13042 /* An operator function must either be a non-static member function
13043 or have at least one parameter of a class, a reference to a class,
13044 an enumeration, or a reference to an enumeration. 13.4.0.6 */
13046 {
13052 {
13055 }
13056 else
13057 {
13058 tree p;
13061 {
13065 }
13068 {
13073 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
13074 because these checks are performed even on
13075 template functions. */
13079 }
13082 {
13087 }
13088 }
13089 }
13091 /* There are no restrictions on the arguments to an overloaded
13092 "operator ()". */
13096 /* Warn about conversion operators that will never be used. */
13099 && warn_conversion
13100 /* Warn only declaring the function; there is no need to
13101 warn again about out-of-class definitions. */
13103 {
13112 ref
13118 {
13121 ref
13126 /* Don't force t to be complete here. */
13131 ref
13136 }
13138 }
13141 {
13142 /* 13.4.0.3 */
13145 }
13147 {
13150 }
13152 {
13154 /* We pick the one-argument operator codes by default, so
13155 we don't have to change anything. */
13156 ;
13158 {
13159 /* If we thought this was a unary operator, we now know
13160 it to be a binary operator. */
13162 {
13189 }
13195 && ! processing_template_decl
13197 {
13200 decl);
13201 else
13205 }
13206 }
13207 else
13208 {
13211 else
13214 }
13216 /* More Effective C++ rule 6. */
13222 {
13230 {
13233 arg))
13236 }
13237 else
13238 {
13241 }
13242 }
13243 }
13245 {
13247 {
13250 else
13253 }
13254 }
13256 {
13258 {
13261 else
13264 }
13266 /* More Effective C++ rule 7. */
13272 decl);
13273 }
13275 /* Effective C++ rule 23. */
13287 /* [over.oper]/8 */
13291 {
13295 {
13297 decl);
13298 }
13299 else
13300 {
13303 }
13304 }
13305 }
13307 }
13308 \f
13309 /* Return a string giving the keyword associate with CODE. */
13313 {
13315 {
13328 }
13329 }
13331 /* Name lookup in an elaborated-type-specifier (after the keyword
13332 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
13333 elaborated-type-specifier is invalid, issue a diagnostic and return
13334 error_mark_node; otherwise, return the *_TYPE to which it referred.
13335 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
13337 tree
13339 tree decl,
13341 {
13342 tree type;
13344 /* In the case of:
13346 struct S { struct S *p; };
13348 name lookup will find the TYPE_DECL for the implicit "S::S"
13349 typedef. Adjust for that here. */
13355 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
13356 is false for this case as well. */
13358 {
13362 }
13363 /* Accept template template parameters. */
13367 ;
13368 /* [dcl.type.elab]
13370 If the identifier resolves to a typedef-name or the
13371 simple-template-id resolves to an alias template
13372 specialization, the elaborated-type-specifier is ill-formed.
13374 In other words, the only legitimate declaration to use in the
13375 elaborated type specifier is the implicit typedef created when
13376 the type is declared. */
13380 {
13384 else
13389 }
13394 {
13398 }
13401 {
13405 }
13409 {
13410 /* If a class template appears as elaborated type specifier
13411 without a template header such as:
13413 template <class T> class C {};
13414 void f(class C); // No template header here
13416 then the required template argument is missing. */
13421 }
13424 }
13426 /* Lookup NAME in elaborate type specifier in scope according to
13427 SCOPE and issue diagnostics if necessary.
13428 Return *_TYPE node upon success, NULL_TREE when the NAME is not
13429 found, and ERROR_MARK_NODE for type error. */
13431 static tree
13434 {
13435 tree t;
13436 tree decl;
13438 {
13439 /* First try ordinary name lookup, ignoring hidden class name
13440 injected via friend declaration. */
13443 /* If that fails, the name will be placed in the smallest
13444 non-class, non-function-prototype scope according to 3.3.1/5.
13445 We may already have a hidden name declared as friend in this
13446 scope. So lookup again but not ignoring hidden names.
13447 If we find one, that name will be made visible rather than
13448 creating a new tag. */
13451 }
13452 else
13457 /* If scope is ts_current we're defining a class, so ignore a
13458 template template parameter. */
13464 {
13465 /* Look for invalid nested type:
13466 class C {
13467 class C {};
13468 }; */
13470 {
13473 decl);
13475 }
13477 /* Two cases we need to consider when deciding if a class
13478 template is allowed as an elaborated type specifier:
13479 1. It is a self reference to its own class.
13480 2. It comes with a template header.
13482 For example:
13484 template <class T> class C {
13485 class C *c1; // DECL_SELF_REFERENCE_P is true
13486 class D;
13487 };
13488 template <class U> class C; // template_header_p is true
13489 template <class T> class C<T>::D {
13490 class C *c2; // DECL_SELF_REFERENCE_P is true
13491 }; */
13494 decl,
13495 template_header_p
13500 {
13509 }
13512 }
13514 {
13518 }
13519 else
13521 }
13523 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
13524 Define the tag as a forward-reference if it is not defined.
13526 If a declaration is given, process it here, and report an error if
13527 multiple declarations are not identical.
13529 SCOPE is TS_CURRENT when this is also a definition. Only look in
13530 the current frame for the name (since C++ allows new names in any
13531 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
13532 declaration. Only look beginning from the current scope outward up
13533 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
13535 TEMPLATE_HEADER_P is true when this declaration is preceded by
13536 a set of template parameters. */
13538 static tree
13541 {
13543 tree t;
13545 tag_scope scope;
13550 {
13563 }
13567 else
13570 /* In case of anonymous name, xref_tag is only called to
13571 make type node and push name. Name lookup is not required. */
13574 else
13584 {
13588 /* Since SCOPE is not TS_CURRENT, we are not looking at a
13589 definition of this tag. Since, in addition, we are currently
13590 processing a (member) template declaration of a template
13591 class, we must be very careful; consider:
13593 template <class X>
13594 struct S1
13596 template <class U>
13597 struct S2
13598 { template <class V>
13599 friend struct S1; };
13601 Here, the S2::S1 declaration should not be confused with the
13602 outer declaration. In particular, the inner version should
13603 have a template parameter of level 2, not level 1. This
13604 would be particularly important if the member declaration
13605 were instead:
13607 template <class V = U> friend struct S1;
13609 say, when we should tsubst into `U' when instantiating
13610 S2. On the other hand, when presented with:
13612 template <class T>
13613 struct S1 {
13614 template <class U>
13615 struct S2 {};
13616 template <class U>
13617 friend struct S2;
13618 };
13620 we must find the inner binding eventually. We
13621 accomplish this by making sure that the new type we
13622 create to represent this declaration has the right
13623 TYPE_CONTEXT. */
13626 }
13629 {
13630 /* If no such tag is yet defined, create a forward-reference node
13631 and record it as the "definition".
13632 When a real declaration of this type is found,
13633 the forward-reference will be altered into a real type. */
13635 {
13638 }
13639 else
13640 {
13644 /* Remember that we're declaring a lambda to avoid bogus errors
13645 in push_template_decl. */
13648 }
13649 }
13650 else
13651 {
13653 {
13654 /* Check that we aren't trying to overload a class with different
13655 constraints. */
13658 {
13661 }
13664 }
13668 {
13672 }
13674 /* Make injected friend class visible. */
13677 {
13682 {
13685 }
13686 }
13687 }
13690 }
13692 /* Wrapper for xref_tag_1. */
13694 tree
13697 {
13698 tree ret;
13704 }
13707 tree
13709 {
13714 else
13721 }
13723 /* Create the binfo hierarchy for REF with (possibly NULL) base list
13724 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
13725 access_* node, and the TREE_VALUE is the type of the base-class.
13726 Non-NULL TREE_TYPE indicates virtual inheritance. */
13728 void
13730 {
13737 tree default_access;
13743 /* The base of a derived class is private by default, all others are
13744 public. */
13749 /* First, make sure that any templates in base-classes are
13750 instantiated. This ensures that if we call ourselves recursively
13751 we do not get confused about which classes are marked and which
13752 are not. */
13755 {
13758 /* The dependent_type_p call below should really be dependent_scope_p
13759 so that we give a hard error about using an incomplete type as a
13760 base, but we allow it with a pedwarn for backward
13761 compatibility. */
13767 /* An incomplete type. Remove it from the list. */
13769 else
13770 {
13771 max_bases++;
13773 max_dvbases++;
13777 }
13778 }
13783 /* The binfo slot should be empty, unless this is an (ill-formed)
13784 redefinition. */
13795 /* Apply base-class info set up to the variants of this type. */
13799 {
13801 /* A C++98 POD cannot have base classes. */
13806 }
13813 {
13819 }
13822 {
13830 /* Before C++17, an aggregate cannot have base classes. In C++17, an
13831 aggregate can't have virtual, private, or protected base classes. */
13842 {
13844 basetype);
13846 }
13850 {
13852 /* The original basetype could have been a typedef'd type. */
13855 /* Inherit flags from the base. */
13866 }
13868 /* We must do this test after we've seen through a typedef
13869 type. */
13871 {
13874 else
13877 }
13880 /* Regenerate the pack expansion for the bases. */
13894 dropped_base:
13895 /* Update max_vbases to reflect the reality that we are dropping
13896 this base: if it reaches zero we want to undo the vec_alloc
13897 above to avoid inconsistencies during error-recovery: eg, in
13898 build_special_member_call, CLASSTYPE_VBASECLASSES non null
13899 and vtt null (c++/27952). */
13901 max_vbases--;
13903 max_vbases
13905 }
13912 /* If we didn't get max_vbases vbases, we must have shared at
13913 least one of them, and are therefore diamond shaped. */
13916 /* Unmark all the types. */
13921 /* Now see if we have a repeated base type. */
13923 {
13926 {
13928 {
13931 }
13933 }
13938 else
13940 }
13941 }
13943 \f
13944 /* Copies the enum-related properties from type SRC to type DST.
13945 Used with the underlying type of an enum and the enum itself. */
13946 static void
13948 {
13949 tree t;
13951 {
13961 else
13965 }
13966 }
13968 /* Begin compiling the definition of an enumeration type.
13969 NAME is its name,
13971 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
13973 UNDERLYING_TYPE is the type that will be used as the storage for
13974 the enumeration type. This should be NULL_TREE if no storage type
13975 was specified.
13977 ATTRIBUTES are any attributes specified after the enum-key.
13979 SCOPED_ENUM_P is true if this is a scoped enumeration type.
13981 if IS_NEW is not NULL, gets TRUE iff a new type is created.
13983 Returns the type object, as yet incomplete.
13984 Also records info about it so that build_enumerator
13985 may be used to declare the individual values as they are read. */
13987 tree
13990 {
13996 /* [C++0x dcl.enum]p5:
13998 If not explicitly specified, the underlying type of a scoped
13999 enumeration type is int. */
14006 /* If this is the real definition for a previous forward reference,
14007 fill in the contents in the same object that used to be the
14008 forward reference. */
14014 /* In case of a template_decl, the only check that should be deferred
14015 to instantiation time is the comparison of underlying types. */
14017 {
14019 {
14025 }
14027 {
14033 }
14039 {
14045 }
14046 }
14050 {
14051 /* In case of error, make a dummy enum to allow parsing to
14052 continue. */
14054 {
14057 }
14059 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
14060 of an opaque enum, or an opaque enum of an already defined
14061 enumeration (C++0x only).
14062 In any other case, it'll be NULL_TREE. */
14064 {
14067 }
14070 /* Do not push the decl more than once, unless we need to
14071 compare underlying types at instantiation time */
14074 || (underlying_type
14078 {
14081 }
14082 else
14089 /* The enum is considered opaque until the opening '{' of the
14090 enumerator list. */
14093 }
14100 {
14102 /* We already checked that it matches, don't change it to a different
14105 {
14108 }
14111 else
14114 }
14116 /* If into a template class, the returned enum is always the first
14117 declaration (opaque or not) seen. This way all the references to
14118 this type will be to the same declaration. The following ones are used
14119 only to check for definition errors. */
14122 else
14124 }
14126 /* After processing and defining all the values of an enumeration type,
14127 install their decls in the enumeration type.
14128 ENUMTYPE is the type object. */
14130 void
14132 {
14133 tree values;
14134 tree underlying_type;
14135 tree decl;
14136 tree value;
14138 tree t;
14140 bool fixed_underlying_type_p
14143 /* We built up the VALUES in reverse order. */
14146 /* For an enum defined in a template, just set the type of the values;
14147 all further processing is postponed until the template is
14148 instantiated. We need to set the type so that tsubst of a CONST_DECL
14149 works. */
14151 {
14153 values;
14157 }
14159 /* Determine the minimum and maximum values of the enumerators. */
14161 {
14165 values;
14167 {
14170 /* [dcl.enum]: Following the closing brace of an enum-specifier,
14171 each enumerator has the type of its enumeration. Prior to the
14172 closing brace, the type of each enumerator is the type of its
14173 initializing value. */
14176 /* Update the minimum and maximum values, if appropriate. */
14180 /* Figure out what the minimum and maximum values of the
14181 enumerators are. */
14188 }
14189 }
14190 else
14191 /* [dcl.enum]
14193 If the enumerator-list is empty, the underlying type is as if
14194 the enumeration had a single enumerator with value 0. */
14198 {
14199 /* Compute the number of bits require to represent all values of the
14200 enumeration. We must do this before the type of MINNODE and
14201 MAXNODE are transformed, since tree_int_cst_min_precision relies
14202 on the TREE_TYPE of the value it is passed. */
14210 /* Determine the underlying type of the enumeration.
14212 [dcl.enum]
14214 The underlying type of an enumeration is an integral type that
14215 can represent all the enumerator values defined in the
14216 enumeration. It is implementation-defined which integral type is
14217 used as the underlying type for an enumeration except that the
14218 underlying type shall not be larger than int unless the value of
14219 an enumerator cannot fit in an int or unsigned int.
14221 We use "int" or an "unsigned int" as the underlying type, even if
14222 a smaller integral type would work, unless the user has
14223 explicitly requested that we use the smallest possible type. The
14224 user can request that for all enumerations with a command line
14225 flag, or for just one enumeration with an attribute. */
14227 use_short_enum = flag_short_enums
14230 /* If the precision of the type was specified with an attribute and it
14231 was too small, give an error. Otherwise, use it. */
14233 {
14236 else
14237 {
14240 }
14241 }
14245 itk++)
14246 {
14252 }
14254 {
14255 /* DR 377
14257 IF no integral type can represent all the enumerator values, the
14258 enumeration is ill-formed. */
14263 }
14265 /* [dcl.enum]
14267 The value of sizeof() applied to an enumeration type, an object
14268 of an enumeration type, or an enumerator, is the value of sizeof()
14269 applied to the underlying type. */
14272 /* Compute the minimum and maximum values for the type.
14274 [dcl.enum]
14276 For an enumeration where emin is the smallest enumerator and emax
14277 is the largest, the values of the enumeration are the values of the
14278 underlying type in the range bmin to bmax, where bmin and bmax are,
14279 respectively, the smallest and largest values of the smallest bit-
14280 field that can store emin and emax. */
14282 /* The middle-end currently assumes that types with TYPE_PRECISION
14283 narrower than their underlying type are suitably zero or sign
14284 extended to fill their mode. Similarly, it assumes that the front
14285 end assures that a value of a particular type must be within
14286 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
14288 We used to set these fields based on bmin and bmax, but that led
14289 to invalid assumptions like optimizing away bounds checking. So
14290 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
14291 TYPE_MAX_VALUE to the values for the mode above and only restrict
14292 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
14296 set_min_and_max_values_for_integral_type
14299 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
14302 }
14303 else
14306 /* Convert each of the enumerators to the type of the underlying
14307 type of the enumeration. */
14309 {
14310 location_t saved_location;
14316 /* If the enumeration type has a fixed underlying type, we
14317 already checked all of the enumerator values. */
14319 else
14322 tf_warning_or_error);
14325 /* Do not clobber shared ints. */
14330 }
14332 /* Fix up all variant types of this enum type. */
14339 {
14341 current_class_type);
14343 }
14345 /* Finish debugging output for this type. */
14348 /* Each enumerator now has the type of its enumeration. Clear the cache
14349 so that this change in types doesn't confuse us later on. */
14351 }
14353 /* Finishes the enum type. This is called only the first time an
14354 enumeration is seen, be it opaque or odinary.
14355 ENUMTYPE is the type object. */
14357 void
14359 {
14361 {
14365 }
14367 /* If this is a forward declaration, there should not be any variants,
14368 though we can get a variant in the middle of an enum-specifier with
14369 wacky code like 'enum E { e = sizeof(const E*) };' */
14373 }
14375 /* Build and install a CONST_DECL for an enumeration constant of the
14376 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
14377 Apply ATTRIBUTES if available. LOC is the location of NAME.
14378 Assignment of sequential values by default is handled here. */
14380 void
14382 location_t loc)
14383 {
14384 tree decl;
14385 tree context;
14386 tree type;
14388 /* scalar_constant_value will pull out this expression, so make sure
14389 it's folded as appropriate. */
14393 /* If the VALUE was erroneous, pretend it wasn't there; that will
14394 result in the enum being assigned the next value in sequence. */
14398 /* Remove no-op casts from the value. */
14403 {
14404 /* Validate and default VALUE. */
14406 {
14408 {
14413 }
14416 value = perform_implicit_conversion_flags
14424 {
14427 {
14431 }
14432 else
14433 {
14437 {
14441 }
14442 }
14443 }
14444 }
14446 /* Default based on previous value. */
14448 {
14450 {
14451 tree prev_value;
14454 /* C++03 7.2/4: If no initializer is specified for the first
14455 enumerator, the type is an unspecified integral
14456 type. Otherwise the type is the same as the type of the
14457 initializing value of the preceding enumerator unless the
14458 incremented value is not representable in that type, in
14459 which case the type is an unspecified integral type
14460 sufficient to contain the incremented value. */
14464 else
14465 {
14471 {
14474 {
14477 {
14483 }
14490 }
14493 else
14495 }
14498 {
14501 }
14502 }
14503 }
14504 else
14506 }
14508 /* Remove no-op casts from the value. */
14511 /* If the underlying type of the enum is fixed, check whether
14512 the enumerator values fits in the underlying type. If it
14513 does not fit, the program is ill-formed [C++0x dcl.enum]. */
14515 && value
14517 {
14522 /* Convert the value to the appropriate type. */
14524 }
14525 }
14527 /* C++ associates enums with global, function, or class declarations. */
14530 /* Build the actual enumeration constant. Note that the enumeration
14531 constants have the underlying type of the enum (if it is fixed)
14532 or the type of their initializer (if the underlying type of the
14533 enum is not fixed):
14535 [ C++0x dcl.enum ]
14537 If the underlying type is fixed, the type of each enumerator
14538 prior to the closing brace is the underlying type; if the
14539 initializing value of an enumerator cannot be represented by
14540 the underlying type, the program is ill-formed. If the
14541 underlying type is not fixed, the type of each enumerator is
14542 the type of its initializing value.
14544 If the underlying type is not fixed, it will be computed by
14545 finish_enum and we will reset the type of this enumerator. Of
14546 course, if we're processing a template, there may be no value. */
14560 {
14561 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
14562 on the TYPE_FIELDS list for `S'. (That's so that you can say
14563 things like `S::i' later.) */
14565 /* The enumerator may be getting declared outside of its enclosing
14566 class, like so:
14568 class S { public: enum E : int; }; enum S::E : int { i = 7; };
14570 For which case we need to make sure that the access of `S::i'
14571 matches the access of `S::E'. */
14577 else
14583 }
14584 else
14587 /* Add this enumeration constant to the list for this type. */
14589 }
14591 /* Look for an enumerator with the given NAME within the enumeration
14592 type ENUMTYPE. This routine is used primarily for qualified name
14593 lookup into an enumerator in C++0x, e.g.,
14595 enum class Color { Red, Green, Blue };
14597 Color color = Color::Red;
14599 Returns the value corresponding to the enumerator, or
14600 NULL_TREE if no such enumerator was found. */
14601 tree
14603 {
14604 tree e;
14609 }
14611 \f
14612 /* We're defining DECL. Make sure that its type is OK. */
14614 static void
14616 {
14620 /* In a function definition, arg types must be complete. */
14627 {
14632 /* Make it return void instead. */
14635 void_type_node,
14637 else
14639 fntype
14642 fntype = (cp_build_type_attribute_variant
14645 }
14646 else
14648 }
14650 /* True iff FN is an implicitly-defined default constructor. */
14652 static bool
14654 {
14658 }
14660 /* Clobber the contents of *this to let the back end know that the object
14661 storage is dead when we enter the constructor or leave the destructor. */
14663 static tree
14665 {
14666 /* Clobbering an empty base is pointless, and harmful if its one byte
14667 TYPE_SIZE overlays real data. */
14671 /* If we have virtual bases, clobber the whole object, but only if we're in
14672 charge. If we don't have virtual bases, clobber the as-base type so we
14673 don't mess with tail padding. */
14685 {
14688 }
14695 }
14697 /* Create the FUNCTION_DECL for a function definition.
14698 DECLSPECS and DECLARATOR are the parts of the declaration;
14699 they describe the function's name and the type it returns,
14700 but twisted together in a fashion that parallels the syntax of C.
14702 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
14703 DECLARATOR is really the DECL for the function we are about to
14704 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
14705 indicating that the function is an inline defined in-class.
14707 This function creates a binding context for the function body
14708 as well as setting up the FUNCTION_DECL in current_function_decl.
14710 For C++, we must first check whether that datum makes any sense.
14711 For example, "class A local_a(1,2);" means that variable local_a
14712 is an aggregate of type A, which should have a constructor
14713 applied to it with the argument list [1, 2].
14715 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
14716 or may be a BLOCK if the function has been defined previously
14717 in this translation unit. On exit, DECL_INITIAL (decl1) will be
14718 error_mark_node if the function has never been defined, or
14719 a BLOCK if the function has been defined somewhere. */
14721 bool
14723 {
14725 tree fntype;
14726 tree restype;
14729 tree current_function_parms;
14734 /* Sanity check. */
14742 /* ISO C++ 11.4/5. A friend function defined in a class is in
14743 the (lexical) scope of the class in which it is defined. */
14745 {
14748 /* CTYPE could be null here if we're dealing with a template;
14749 for example, `inline friend float foo()' inside a template
14750 will have no CTYPE set. */
14753 else
14755 }
14762 /* Handle gnu_inline attribute. */
14764 {
14769 }
14772 /* This is a constructor, we must ensure that any default args
14773 introduced by this definition are propagated to the clones
14774 now. The clones are used directly in overload resolution. */
14777 /* Sometimes we don't notice that a function is a static member, and
14778 build a METHOD_TYPE for it. Fix that up now. */
14782 /* Set up current_class_type, and enter the scope of the class, if
14783 appropriate. */
14789 /* Now that we have entered the scope of the class, we must restore
14790 the bindings for any template parameters surrounding DECL1, if it
14791 is an inline member template. (Order is important; consider the
14792 case where a template parameter has the same name as a field of
14793 the class.) It is not until after this point that
14794 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
14798 /* Effective C++ rule 15. */
14804 /* Make the init_value nonzero so pushdecl knows this is not tentative.
14805 error_mark_node is replaced below (in poplevel) with the BLOCK. */
14809 /* This function exists in static storage.
14810 (This does not mean `static' in the C sense!) */
14813 /* We must call push_template_decl after current_class_type is set
14814 up. (If we are processing inline definitions after exiting a
14815 class scope, current_class_type will be NULL_TREE until set above
14816 by push_nested_class.) */
14818 {
14821 {
14825 }
14827 }
14829 /* We are now in the scope of the function being defined. */
14832 /* Save the parm names or decls from this function's declarator
14833 where store_parm_decls will find them. */
14836 /* Make sure the parameter and return types are reasonable. When
14837 you declare a function, these types can be incomplete, but they
14838 must be complete when you define the function. */
14841 /* Build the return declaration for the function. */
14845 {
14846 tree resdecl;
14854 }
14856 /* Let the user know we're compiling this function. */
14859 /* Record the decl so that the function name is defined.
14860 If we already have a decl for this name, and it is a FUNCTION_DECL,
14861 use the old decl. */
14863 {
14864 /* A specialization is not used to guide overload resolution. */
14868 {
14872 /* If something went wrong when registering the declaration,
14873 use DECL1; we have to have a FUNCTION_DECL to use when
14874 parsing the body of the function. */
14875 ;
14876 else
14877 {
14878 /* Otherwise, OLDDECL is either a previous declaration
14879 of the same function or DECL1 itself. */
14886 {
14887 tree context;
14889 /* Check whether DECL1 is in an anonymous
14890 namespace. */
14892 context;
14894 {
14898 }
14902 OPT_Wmissing_declarations,
14904 }
14907 }
14908 }
14909 else
14910 {
14911 /* We need to set the DECL_CONTEXT. */
14914 }
14918 /* If #pragma weak applies, mark the decl appropriately now.
14919 The pragma only applies to global functions. Because
14920 determining whether or not the #pragma applies involves
14921 computing the mangled name for the declaration, we cannot
14922 apply the pragma until after we have merged this declaration
14923 with any previous declarations; if the original declaration
14924 has a linkage specification, that specification applies to
14925 the definition as well, and may affect the mangled name. */
14928 }
14930 /* Reset this in case the call to pushdecl changed it. */
14935 /* This function may already have been parsed, in which case just
14936 return; our caller will skip over the body without parsing. */
14940 /* Initialize RTL machinery. We cannot do this until
14941 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
14942 even when processing a template; this is how we get
14943 CFUN set up, and our per-function variables initialized.
14944 FIXME factor out the non-RTL stuff. */
14948 /* Initialize the language data structures. Whenever we start
14949 a new function, we destroy temporaries in the usual way. */
14955 {
14958 }
14960 /* Start the statement-tree, start the tree now. */
14963 /* If we are (erroneously) defining a function that we have already
14964 defined before, wipe out what we knew before. */
14969 {
14970 /* We know that this was set up by `grokclassfn'. We do not
14971 wait until `store_parm_decls', since evil parse errors may
14972 never get us to that point. Here we keep the consistency
14973 between `current_class_type' and `current_class_ptr'. */
14979 cp_function_chain->x_current_class_ref
14981 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
14984 /* Constructors and destructors need to know whether they're "in
14985 charge" of initializing virtual base classes. */
14988 {
14991 }
14993 {
14996 }
14997 }
15000 /* Implicitly-defined methods (like the
15001 destructor for a class in which no destructor
15002 is explicitly declared) must not be defined
15003 until their definition is needed. So, we
15004 ignore interface specifications for
15005 compiler-generated functions. */
15011 {
15018 /* This is a function in a local class in an extern inline
15019 or template function. */
15021 }
15022 /* If this function belongs to an interface, it is public.
15023 If it belongs to someone else's interface, it is also external.
15024 This only affects inlines and template instantiations. */
15026 {
15029 {
15033 && ! flag_implement_inlines
15036 /* For WIN32 we also want to put these in linkonce sections. */
15038 }
15039 else
15042 /* If this function is in an interface implemented in this file,
15043 make sure that the back end knows to emit this function
15044 here. */
15047 }
15050 {
15051 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
15052 interface, we will have both finfo->interface_unknown and
15053 finfo->interface_only set. In that case, we don't want to
15054 use the normal heuristics because someone will supply a
15055 #pragma implementation elsewhere, and deducing it here would
15056 produce a conflict. */
15061 }
15062 else
15063 {
15064 /* This is a definition, not a reference.
15065 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
15073 else
15075 }
15077 /* Determine the ELF visibility attribute for the function. We must not
15078 do this before calling "pushdecl", as we must allow "duplicate_decls"
15079 to merge any attributes appropriately. We also need to wait until
15080 linkage is set. */
15104 /* Clobbering an empty base is harmful if it overlays real data. */
15106 /* We can't clobber safely for an implicitly-defined default constructor
15107 because part of the initialization might happen before we enter the
15108 constructor, via AGGR_INIT_ZERO_FIRST (c++/68006). */
15120 }
15123 /* Like start_preparsed_function, except that instead of a
15124 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
15126 Returns true on success. If the DECLARATOR is not suitable
15127 for a function, we return false, which tells the parser to
15128 skip the entire function. */
15130 bool
15133 tree attrs)
15134 {
15135 tree decl1;
15141 /* If the declarator is not suitable for a function definition,
15142 cause a syntax error. */
15144 {
15147 }
15150 /* main must return int. grokfndecl should have corrected it
15151 (and issued a diagnostic) if the user got it wrong. */
15153 integer_type_node));
15156 }
15157 \f
15158 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
15159 FN. */
15161 static bool
15163 {
15165 && !processing_template_decl
15167 /* We insert the EH_SPEC_BLOCK only in the original
15168 function; then, it is copied automatically to the
15169 clones. */
15171 /* Implicitly-generated constructors and destructors have
15172 exception specifications. However, those specifications
15173 are the union of the possible exceptions specified by the
15174 constructors/destructors for bases and members, so no
15175 unallowed exception will ever reach this function. By
15176 not creating the EH_SPEC_BLOCK we save a little memory,
15177 and we avoid spurious warnings about unreachable
15178 code. */
15180 }
15182 /* Store the parameter declarations into the current function declaration.
15183 This is called after parsing the parameter declarations, before
15184 digesting the body of the function.
15186 Also install to binding contour return value identifier, if any. */
15188 static void
15190 {
15192 tree parm;
15194 /* This is a chain of any other decls that came in among the parm
15195 declarations. If a parm is declared with enum {foo, bar} x;
15196 then CONST_DECLs for foo and bar are put here. */
15200 {
15201 /* This case is when the function was defined with an ANSI prototype.
15202 The parms already have decls, so we need not do anything here
15203 except record them as in effect
15204 and complain if any redundant old-style parm decls were written. */
15207 tree next;
15209 /* Must clear this because it might contain TYPE_DECLs declared
15210 at class level. */
15213 /* If we're doing semantic analysis, then we'll call pushdecl
15214 for each of these. We must do them in reverse order so that
15215 they end in the correct forward order. */
15219 {
15223 else
15224 {
15225 /* If we find an enum constant or a type tag,
15226 put it aside for the moment. */
15229 }
15230 }
15232 /* Get the decls in their original chain order and record in the
15233 function. This is all and only the PARM_DECLs that were
15234 pushed into scope by the loop above. */
15236 }
15237 else
15240 /* Now store the final chain of decls for the arguments
15241 as the decl-chain of the current lexical scope.
15242 Put the enumerators in as well, at the front so that
15243 DECL_ARGUMENTS is not modified. */
15248 }
15250 \f
15251 /* We have finished doing semantic analysis on DECL, but have not yet
15252 generated RTL for its body. Save away our current state, so that
15253 when we want to generate RTL later we know what to do. */
15255 static void
15257 {
15260 /* Save the language-specific per-function data so that we can
15261 get it back when we really expand this function. */
15264 /* Make a copy. */
15269 /* Clear out the bits we don't need. */
15274 }
15277 /* Set the return value of the constructor (if present). */
15279 static void
15281 {
15282 tree val;
15283 tree exprstmt;
15286 {
15287 /* Any return from a constructor will end up here. */
15293 /* Return the address of the object. */
15296 }
15297 }
15299 /* Do all the processing for the beginning of a destructor; set up the
15300 vtable pointers and cleanups for bases and members. */
15302 static void
15304 {
15305 tree compound_stmt;
15307 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
15308 issued an error message. We still want to try to process the
15309 body of the function, but initialize_vtbl_ptrs will crash if
15310 TYPE_BINFO is NULL. */
15312 {
15314 /* Make all virtual function table pointers in non-virtual base
15315 classes point to CURRENT_CLASS_TYPE's virtual function
15316 tables. */
15321 /* Clobbering an empty base is harmful if it overlays real data. */
15325 /* And insert cleanups for our bases and members so that they
15326 will be properly destroyed if we throw. */
15328 }
15329 }
15331 /* At the end of every destructor we generate code to delete the object if
15332 necessary. Do that now. */
15334 static void
15336 {
15337 tree exprstmt;
15339 /* Any return from a destructor will end up here; that way all base
15340 and member cleanups will be run when the function returns. */
15344 {
15345 tree val;
15350 /* Return the address of the object. */
15353 }
15354 }
15356 /* Do the necessary processing for the beginning of a function body, which
15357 in this case includes member-initializers, but not the catch clauses of
15358 a function-try-block. Currently, this means opening a binding level
15359 for the member-initializers (in a ctor), member cleanups (in a dtor),
15360 and capture proxies (in a lambda operator()). */
15362 tree
15364 {
15365 tree stmt;
15372 else
15373 /* Always keep the BLOCK node associated with the outermost pair of
15374 curly braces of a function. These are needed for correct
15375 operation of dwarfout.c. */
15386 }
15388 /* Do the processing for the end of a function body. Currently, this means
15389 closing out the cleanups for fully-constructed bases and members, and in
15390 the case of the destructor, deleting the object if desired. Again, this
15391 is only meaningful for [cd]tors, since they are the only functions where
15392 there is a significant distinction between the main body and any
15393 function catch clauses. Handling, say, main() return semantics here
15394 would be wrong, as flowing off the end of a function catch clause for
15395 main() would also need to return 0. */
15397 void
15399 {
15403 /* Close the block. */
15412 }
15414 /* Given a function, returns the BLOCK corresponding to the outermost level
15415 of curly braces, skipping the artificial block created for constructor
15416 initializers. */
15418 tree
15420 {
15430 }
15432 /* If FNDECL is a class's key method, add the class to the list of
15433 keyed classes that should be emitted. */
15435 static void
15437 {
15441 {
15445 }
15446 }
15448 /* Subroutine of finish_function.
15449 Save the body of constexpr functions for possible
15450 future compile time evaluation. */
15452 static void
15454 {
15460 }
15462 /* Finish up a function declaration and compile that function
15463 all the way to assembler language output. The free the storage
15464 for the function definition.
15466 FLAGS is a bitwise or of the following values:
15467 2 - INCLASS_INLINE
15468 We just finished processing the body of an in-class inline
15469 function definition. (This processing will have taken place
15470 after the class definition is complete.) */
15472 tree
15474 {
15479 /* When we get some parse errors, we can end up without a
15480 current_function_decl, so cope. */
15491 /* TREE_READONLY (fndecl) = 1;
15492 This caused &foo to be of type ptr-to-const-function
15493 which then got a warning when stored in a ptr-to-function variable. */
15496 /* The current function is being defined, so its DECL_INITIAL should
15497 be set, and unless there's a multiple definition, it should be
15498 error_mark_node. */
15501 /* For a cloned function, we've already got all the code we need;
15502 there's no need to add any extra bits. */
15504 {
15505 /* Make it so that `main' always returns 0 by default. */
15512 current_eh_spec_block);
15513 }
15515 /* If we're saving up tree structure, tie off the function now. */
15523 /* If this function can't throw any exceptions, remember that. */
15526 && !flag_non_call_exceptions
15530 /* This must come after expand_function_end because cleanups might
15531 have declarations (from inline functions) that need to go into
15532 this function's blocks. */
15534 /* If the current binding level isn't the outermost binding level
15535 for this function, either there is a bug, or we have experienced
15536 syntax errors and the statement tree is malformed. */
15538 {
15539 /* Make sure we have already experienced errors. */
15542 /* Throw away the broken statement tree and extra binding
15543 levels. */
15547 {
15550 else
15552 }
15553 }
15556 /* Statements should always be full-expressions at the outermost set
15557 of curly braces for a function. */
15560 /* If there are no return statements in a function with auto return type,
15561 the return type is void. But if the declared type is something like
15562 auto*, this is an error. */
15565 {
15568 {
15570 current_function_auto_return_pattern);
15573 }
15576 }
15578 // If this is a concept, check that the definition is reasonable.
15582 /* Lambda closure members are implicitly constexpr if possible. */
15585 && (processing_template_decl
15590 /* Save constexpr function body before it gets munged by
15591 the NRV transformation. */
15594 /* Invoke the pre-genericize plugin before we start munging things. */
15598 /* Perform delayed folding before NRV transformation. */
15602 /* Set up the named return value optimization, if we can. Candidate
15603 variables are selected in check_return_expr. */
15605 {
15607 tree outer;
15610 /* This is only worth doing for fns that return in memory--and
15611 simpler, since we don't have to worry about promoted modes. */
15613 /* Only allow this for variables declared in the outer scope of
15614 the function so we know that their lifetime always ends with a
15615 return; see g++.dg/opt/nrv6.C. We could be more flexible if
15616 we were to do this optimization in tree-ssa. */
15622 }
15624 /* Remember that we were in class scope. */
15628 /* Must mark the RESULT_DECL as being in this function. */
15631 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
15632 to the FUNCTION_DECL node itself. */
15635 /* Save away current state, if appropriate. */
15639 /* Complain if there's just no return statement. */
15644 /* Don't complain if we abort or throw. */
15645 && !current_function_returns_abnormally
15646 /* Don't complain if there's an infinite loop. */
15647 && !current_function_infinite_loop
15648 /* Don't complain if we are declared noreturn. */
15652 /* Structor return values (if any) are set by the compiler. */
15656 {
15660 }
15662 /* Store the end of the function, so that we get good line number
15663 info for the epilogue. */
15666 /* Complain about parameters that are only set, but never otherwise used. */
15668 && !processing_template_decl
15671 {
15672 tree decl;
15675 decl;
15689 OPT_Wunused_but_set_parameter,
15692 }
15694 /* Complain about locally defined typedefs that are not used in this
15695 function. */
15698 /* Possibly warn about unused parameters. */
15700 && !processing_template_decl
15704 /* Genericize before inlining. */
15706 {
15709 /* Clear out the bits we don't need. */
15719 }
15720 /* Clear out the bits we don't need. */
15723 /* We're leaving the context of this function, so zap cfun. It's still in
15724 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
15728 /* If this is an in-class inline definition, we may have to pop the
15729 bindings for the template parameters that we added in
15730 maybe_begin_member_template_processing when start_function was
15731 called. */
15735 /* Leave the scope of the class. */
15741 /* Clean up. */
15746 }
15747 \f
15748 /* Create the FUNCTION_DECL for a function definition.
15749 DECLSPECS and DECLARATOR are the parts of the declaration;
15750 they describe the return type and the name of the function,
15751 but twisted together in a fashion that parallels the syntax of C.
15753 This function creates a binding context for the function body
15754 as well as setting up the FUNCTION_DECL in current_function_decl.
15756 Returns a FUNCTION_DECL on success.
15758 If the DECLARATOR is not suitable for a function (it defines a datum
15759 instead), we return 0, which tells yyparse to report a parse error.
15761 May return void_type_node indicating that this method is actually
15762 a friend. See grokfield for more details.
15764 Came here with a `.pushlevel' .
15766 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
15767 CHANGES TO CODE IN `grokfield'. */
15769 tree
15772 {
15780 {
15783 }
15788 /* Pass friends other than inline friend functions back. */
15793 {
15798 }
15807 /* We process method specializations in finish_struct_1. */
15809 {
15813 }
15816 {
15818 {
15821 }
15822 }
15828 }
15829 \f
15831 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
15832 we can lay it out later, when and if its type becomes complete.
15834 Also handle constexpr variables where the initializer involves
15835 an unlowered PTRMEM_CST because the class isn't complete yet. */
15837 void
15839 {
15842 /* Keep track of variables with incomplete types. */
15845 {
15853 /* RTTI TD entries are created while defining the type_info. */
15856 {
15859 }
15863 {
15864 /* When the outermost open class is complete we can resolve any
15865 pointers-to-members. */
15869 }
15870 }
15871 }
15873 /* Called when a class type (given by TYPE) is defined. If there are
15874 any existing VAR_DECLs whose type has been completed by this
15875 declaration, update them now. */
15877 void
15879 {
15884 {
15886 {
15893 {
15894 /* Complete the type of the variable. The VAR_DECL itself
15895 will be laid out in expand_expr. */
15898 }
15900 /* Remove this entry from the list. */
15902 }
15903 else
15904 ix++;
15905 }
15907 /* Check for pending declarations which may have abstract type. */
15909 }
15911 /* If DECL is of a type which needs a cleanup, build and return an
15912 expression to perform that cleanup here. Return NULL_TREE if no
15913 cleanup need be done. DECL can also be a _REF when called from
15914 split_nonconstant_init_1. */
15916 tree
15918 {
15919 tree type;
15920 tree attr;
15921 tree cleanup;
15923 /* Assume no cleanup is required. */
15929 /* Handle "__attribute__((cleanup))". We run the cleanup function
15930 before the destructor since the destructor is what actually
15931 terminates the lifetime of the object. */
15934 else
15937 {
15938 tree id;
15939 tree fn;
15940 tree arg;
15942 /* Get the name specified by the user for the cleanup function. */
15944 /* Look up the name to find the cleanup function to call. It is
15945 important to use lookup_name here because that is what is
15946 used in c-common.c:handle_cleanup_attribute when performing
15947 initial checks on the attribute. Note that those checks
15948 include ensuring that the function found is not an overloaded
15949 function, or an object with an overloaded call operator,
15950 etc.; we can rely on the fact that the function found is an
15951 ordinary FUNCTION_DECL. */
15959 }
15960 /* Handle ordinary C++ destructors. */
15963 {
15965 tree addr;
15966 tree call;
15970 else
15981 else
15983 }
15985 /* build_delete sets the location of the destructor call to the
15986 current location, even though the destructor is going to be
15987 called later, at the end of the current scope. This can lead to
15988 a "jumpy" behavior for users of debuggers when they step around
15989 the end of the block. So let's unset the location of the
15990 destructor call instead. */
15996 /* Treat objects with destructors as used; the destructor may do
15997 something substantive. */
16002 }
16004 \f
16005 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
16006 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
16007 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
16009 tree
16011 {
16012 tree fntype;
16013 tree args;
16027 fntype = (cp_build_type_attribute_variant
16029 fntype = (build_exception_variant
16034 }
16036 /* DECL was originally constructed as a non-static member function,
16037 but turned out to be static. Update it accordingly. */
16039 void
16041 {
16054 }
16056 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
16057 one of the language-independent trees. */
16059 enum cp_tree_node_structure_enum
16061 {
16063 {
16080 }
16081 }
16083 /* Build the void_list_node (void_type_node having been created). */
16084 tree
16086 {
16089 }
16091 bool
16093 {
16094 /* A missing noreturn is ok for the `main' function. */
16096 }
16098 /* Return the decl used to identify the COMDAT group into which DECL should
16099 be placed. */
16101 tree
16103 {
16104 /* Virtual tables, construction virtual tables, and virtual table
16105 tables all go in a single COMDAT group, named after the primary
16106 virtual table. */
16109 /* For all other DECLs, the COMDAT group is the mangled name of the
16110 declaration itself. */
16111 else
16112 {
16114 {
16115 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
16116 into the same section as the target function. In that case
16117 we must return target's name. */
16123 else
16125 }
16126 }
16129 }
16131 /* Returns the return type for FN as written by the user, which may include
16132 a placeholder for a deduced return type. */
16134 tree
16136 {
16139 {
16146 }
16148 }
16150 /* Returns true iff DECL was declared with an auto type and it has
16151 not yet been deduced to a real type. */
16153 bool
16155 {
16159 }
16161 /* Complain if DECL has an undeduced return type. */
16163 bool
16165 {
16167 {
16171 }
16173 }