1 /* Perform the semantic phase of parsing, i.e., the process of
2 building tree structure, checking semantic consistency, and
3 building RTL. These routines are used both during actual parsing
4 and during the instantiation of template functions.
6 Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
7 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
8 Written by Mark Mitchell (mmitchell@usa.net) based on code found
9 formerly in parse.y and pt.c.
11 This file is part of GCC.
13 GCC is free software; you can redistribute it and/or modify it
14 under the terms of the GNU General Public License as published by
15 the Free Software Foundation; either version 3, or (at your option)
18 GCC is distributed in the hope that it will be useful, but
19 WITHOUT ANY WARRANTY; without even the implied warranty of
20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 General Public License for more details.
23 You should have received a copy of the GNU General Public License
24 along with GCC; see the file COPYING3. If not see
25 <http://www.gnu.org/licenses/>. */
29 #include "coretypes.h"
33 #include "c-family/c-common.h"
34 #include "c-family/c-objc.h"
35 #include "tree-inline.h"
41 #include "diagnostic.h"
43 #include "tree-iterator.h"
49 /* There routines provide a modular interface to perform many parsing
50 operations. They may therefore be used during actual parsing, or
51 during template instantiation, which may be regarded as a
52 degenerate form of parsing. */
54 static tree maybe_convert_cond (tree);
55 static tree finalize_nrv_r (tree *, int *, void *);
56 static tree capture_decltype (tree);
59 /* Deferred Access Checking Overview
60 ---------------------------------
62 Most C++ expressions and declarations require access checking
63 to be performed during parsing. However, in several cases,
64 this has to be treated differently.
66 For member declarations, access checking has to be deferred
67 until more information about the declaration is known. For
79 When we are parsing the function return type `A::X', we don't
80 really know if this is allowed until we parse the function name.
82 Furthermore, some contexts require that access checking is
83 never performed at all. These include class heads, and template
86 Typical use of access checking functions is described here:
88 1. When we enter a context that requires certain access checking
89 mode, the function `push_deferring_access_checks' is called with
90 DEFERRING argument specifying the desired mode. Access checking
91 may be performed immediately (dk_no_deferred), deferred
92 (dk_deferred), or not performed (dk_no_check).
94 2. When a declaration such as a type, or a variable, is encountered,
95 the function `perform_or_defer_access_check' is called. It
96 maintains a VEC of all deferred checks.
98 3. The global `current_class_type' or `current_function_decl' is then
99 setup by the parser. `enforce_access' relies on these information
102 4. Upon exiting the context mentioned in step 1,
103 `perform_deferred_access_checks' is called to check all declaration
104 stored in the VEC. `pop_deferring_access_checks' is then
105 called to restore the previous access checking mode.
107 In case of parsing error, we simply call `pop_deferring_access_checks'
108 without `perform_deferred_access_checks'. */
110 typedef struct GTY(()) deferred_access {
111 /* A VEC representing name-lookups for which we have deferred
112 checking access controls. We cannot check the accessibility of
113 names used in a decl-specifier-seq until we know what is being
114 declared because code like:
121 A::B* A::f() { return 0; }
123 is valid, even though `A::B' is not generally accessible. */
124 VEC (deferred_access_check,gc)* GTY(()) deferred_access_checks;
126 /* The current mode of access checks. */
127 enum deferring_kind deferring_access_checks_kind;
130 DEF_VEC_O (deferred_access);
131 DEF_VEC_ALLOC_O (deferred_access,gc);
133 /* Data for deferred access checking. */
134 static GTY(()) VEC(deferred_access,gc) *deferred_access_stack;
135 static GTY(()) unsigned deferred_access_no_check;
137 /* Save the current deferred access states and start deferred
138 access checking iff DEFER_P is true. */
141 push_deferring_access_checks (deferring_kind deferring)
143 /* For context like template instantiation, access checking
144 disabling applies to all nested context. */
145 if (deferred_access_no_check || deferring == dk_no_check)
146 deferred_access_no_check++;
149 deferred_access *ptr;
151 ptr = VEC_safe_push (deferred_access, gc, deferred_access_stack, NULL);
152 ptr->deferred_access_checks = NULL;
153 ptr->deferring_access_checks_kind = deferring;
157 /* Resume deferring access checks again after we stopped doing
161 resume_deferring_access_checks (void)
163 if (!deferred_access_no_check)
164 VEC_last (deferred_access, deferred_access_stack)
165 ->deferring_access_checks_kind = dk_deferred;
168 /* Stop deferring access checks. */
171 stop_deferring_access_checks (void)
173 if (!deferred_access_no_check)
174 VEC_last (deferred_access, deferred_access_stack)
175 ->deferring_access_checks_kind = dk_no_deferred;
178 /* Discard the current deferred access checks and restore the
182 pop_deferring_access_checks (void)
184 if (deferred_access_no_check)
185 deferred_access_no_check--;
187 VEC_pop (deferred_access, deferred_access_stack);
190 /* Returns a TREE_LIST representing the deferred checks.
191 The TREE_PURPOSE of each node is the type through which the
192 access occurred; the TREE_VALUE is the declaration named.
195 VEC (deferred_access_check,gc)*
196 get_deferred_access_checks (void)
198 if (deferred_access_no_check)
201 return (VEC_last (deferred_access, deferred_access_stack)
202 ->deferred_access_checks);
205 /* Take current deferred checks and combine with the
206 previous states if we also defer checks previously.
207 Otherwise perform checks now. */
210 pop_to_parent_deferring_access_checks (void)
212 if (deferred_access_no_check)
213 deferred_access_no_check--;
216 VEC (deferred_access_check,gc) *checks;
217 deferred_access *ptr;
219 checks = (VEC_last (deferred_access, deferred_access_stack)
220 ->deferred_access_checks);
222 VEC_pop (deferred_access, deferred_access_stack);
223 ptr = VEC_last (deferred_access, deferred_access_stack);
224 if (ptr->deferring_access_checks_kind == dk_no_deferred)
227 perform_access_checks (checks);
231 /* Merge with parent. */
233 deferred_access_check *chk, *probe;
235 FOR_EACH_VEC_ELT (deferred_access_check, checks, i, chk)
237 FOR_EACH_VEC_ELT (deferred_access_check,
238 ptr->deferred_access_checks, j, probe)
240 if (probe->binfo == chk->binfo &&
241 probe->decl == chk->decl &&
242 probe->diag_decl == chk->diag_decl)
245 /* Insert into parent's checks. */
246 VEC_safe_push (deferred_access_check, gc,
247 ptr->deferred_access_checks, chk);
254 /* Perform the access checks in CHECKS. The TREE_PURPOSE of each node
255 is the BINFO indicating the qualifying scope used to access the
256 DECL node stored in the TREE_VALUE of the node. */
259 perform_access_checks (VEC (deferred_access_check,gc)* checks)
262 deferred_access_check *chk;
267 FOR_EACH_VEC_ELT (deferred_access_check, checks, i, chk)
268 enforce_access (chk->binfo, chk->decl, chk->diag_decl);
271 /* Perform the deferred access checks.
273 After performing the checks, we still have to keep the list
274 `deferred_access_stack->deferred_access_checks' since we may want
275 to check access for them again later in a different context.
282 A::X A::a, x; // No error for `A::a', error for `x'
284 We have to perform deferred access of `A::X', first with `A::a',
288 perform_deferred_access_checks (void)
290 perform_access_checks (get_deferred_access_checks ());
293 /* Defer checking the accessibility of DECL, when looked up in
294 BINFO. DIAG_DECL is the declaration to use to print diagnostics. */
297 perform_or_defer_access_check (tree binfo, tree decl, tree diag_decl)
300 deferred_access *ptr;
301 deferred_access_check *chk;
302 deferred_access_check *new_access;
305 /* Exit if we are in a context that no access checking is performed.
307 if (deferred_access_no_check)
310 gcc_assert (TREE_CODE (binfo) == TREE_BINFO);
312 ptr = VEC_last (deferred_access, deferred_access_stack);
314 /* If we are not supposed to defer access checks, just check now. */
315 if (ptr->deferring_access_checks_kind == dk_no_deferred)
317 enforce_access (binfo, decl, diag_decl);
321 /* See if we are already going to perform this check. */
322 FOR_EACH_VEC_ELT (deferred_access_check,
323 ptr->deferred_access_checks, i, chk)
325 if (chk->decl == decl && chk->binfo == binfo &&
326 chk->diag_decl == diag_decl)
331 /* If not, record the check. */
333 VEC_safe_push (deferred_access_check, gc,
334 ptr->deferred_access_checks, 0);
335 new_access->binfo = binfo;
336 new_access->decl = decl;
337 new_access->diag_decl = diag_decl;
340 /* Used by build_over_call in LOOKUP_SPECULATIVE mode: return whether DECL
341 is accessible in BINFO, and possibly complain if not. If we're not
342 checking access, everything is accessible. */
345 speculative_access_check (tree binfo, tree decl, tree diag_decl,
348 if (deferred_access_no_check)
351 /* If we're checking for implicit delete, we don't want access
353 if (!accessible_p (binfo, decl, true))
355 /* Unless we're under maybe_explain_implicit_delete. */
357 enforce_access (binfo, decl, diag_decl);
364 /* Returns nonzero if the current statement is a full expression,
365 i.e. temporaries created during that statement should be destroyed
366 at the end of the statement. */
369 stmts_are_full_exprs_p (void)
371 return current_stmt_tree ()->stmts_are_full_exprs_p;
374 /* T is a statement. Add it to the statement-tree. This is the C++
375 version. The C/ObjC frontends have a slightly different version of
381 enum tree_code code = TREE_CODE (t);
383 if (EXPR_P (t) && code != LABEL_EXPR)
385 if (!EXPR_HAS_LOCATION (t))
386 SET_EXPR_LOCATION (t, input_location);
388 /* When we expand a statement-tree, we must know whether or not the
389 statements are full-expressions. We record that fact here. */
390 STMT_IS_FULL_EXPR_P (t) = stmts_are_full_exprs_p ();
393 /* Add T to the statement-tree. Non-side-effect statements need to be
394 recorded during statement expressions. */
395 gcc_checking_assert (!VEC_empty (tree, stmt_list_stack));
396 append_to_statement_list_force (t, &cur_stmt_list);
401 /* Returns the stmt_tree to which statements are currently being added. */
404 current_stmt_tree (void)
407 ? &cfun->language->base.x_stmt_tree
408 : &scope_chain->x_stmt_tree);
411 /* If statements are full expressions, wrap STMT in a CLEANUP_POINT_EXPR. */
414 maybe_cleanup_point_expr (tree expr)
416 if (!processing_template_decl && stmts_are_full_exprs_p ())
417 expr = fold_build_cleanup_point_expr (TREE_TYPE (expr), expr);
421 /* Like maybe_cleanup_point_expr except have the type of the new expression be
422 void so we don't need to create a temporary variable to hold the inner
423 expression. The reason why we do this is because the original type might be
424 an aggregate and we cannot create a temporary variable for that type. */
427 maybe_cleanup_point_expr_void (tree expr)
429 if (!processing_template_decl && stmts_are_full_exprs_p ())
430 expr = fold_build_cleanup_point_expr (void_type_node, expr);
436 /* Create a declaration statement for the declaration given by the DECL. */
439 add_decl_expr (tree decl)
441 tree r = build_stmt (input_location, DECL_EXPR, decl);
442 if (DECL_INITIAL (decl)
443 || (DECL_SIZE (decl) && TREE_SIDE_EFFECTS (DECL_SIZE (decl))))
444 r = maybe_cleanup_point_expr_void (r);
448 /* Finish a scope. */
451 do_poplevel (tree stmt_list)
455 if (stmts_are_full_exprs_p ())
456 block = poplevel (kept_level_p (), 1, 0);
458 stmt_list = pop_stmt_list (stmt_list);
460 if (!processing_template_decl)
462 stmt_list = c_build_bind_expr (input_location, block, stmt_list);
463 /* ??? See c_end_compound_stmt re statement expressions. */
469 /* Begin a new scope. */
472 do_pushlevel (scope_kind sk)
474 tree ret = push_stmt_list ();
475 if (stmts_are_full_exprs_p ())
476 begin_scope (sk, NULL);
480 /* Queue a cleanup. CLEANUP is an expression/statement to be executed
481 when the current scope is exited. EH_ONLY is true when this is not
482 meant to apply to normal control flow transfer. */
485 push_cleanup (tree decl, tree cleanup, bool eh_only)
487 tree stmt = build_stmt (input_location, CLEANUP_STMT, NULL, cleanup, decl);
488 CLEANUP_EH_ONLY (stmt) = eh_only;
490 CLEANUP_BODY (stmt) = push_stmt_list ();
493 /* Begin a conditional that might contain a declaration. When generating
494 normal code, we want the declaration to appear before the statement
495 containing the conditional. When generating template code, we want the
496 conditional to be rendered as the raw DECL_EXPR. */
499 begin_cond (tree *cond_p)
501 if (processing_template_decl)
502 *cond_p = push_stmt_list ();
505 /* Finish such a conditional. */
508 finish_cond (tree *cond_p, tree expr)
510 if (processing_template_decl)
512 tree cond = pop_stmt_list (*cond_p);
513 if (TREE_CODE (cond) == DECL_EXPR)
516 if (check_for_bare_parameter_packs (expr))
517 *cond_p = error_mark_node;
522 /* If *COND_P specifies a conditional with a declaration, transform the
525 for (; A x = 42;) { }
527 while (true) { A x = 42; if (!x) break; }
528 for (;;) { A x = 42; if (!x) break; }
529 The statement list for BODY will be empty if the conditional did
530 not declare anything. */
533 simplify_loop_decl_cond (tree *cond_p, tree body)
537 if (!TREE_SIDE_EFFECTS (body))
541 *cond_p = boolean_true_node;
543 if_stmt = begin_if_stmt ();
544 cond = cp_build_unary_op (TRUTH_NOT_EXPR, cond, 0, tf_warning_or_error);
545 finish_if_stmt_cond (cond, if_stmt);
546 finish_break_stmt ();
547 finish_then_clause (if_stmt);
548 finish_if_stmt (if_stmt);
551 /* Finish a goto-statement. */
554 finish_goto_stmt (tree destination)
556 if (TREE_CODE (destination) == IDENTIFIER_NODE)
557 destination = lookup_label (destination);
559 /* We warn about unused labels with -Wunused. That means we have to
560 mark the used labels as used. */
561 if (TREE_CODE (destination) == LABEL_DECL)
562 TREE_USED (destination) = 1;
565 destination = mark_rvalue_use (destination);
566 if (!processing_template_decl)
568 destination = cp_convert (ptr_type_node, destination);
569 if (error_operand_p (destination))
574 check_goto (destination);
576 return add_stmt (build_stmt (input_location, GOTO_EXPR, destination));
579 /* COND is the condition-expression for an if, while, etc.,
580 statement. Convert it to a boolean value, if appropriate.
581 In addition, verify sequence points if -Wsequence-point is enabled. */
584 maybe_convert_cond (tree cond)
586 /* Empty conditions remain empty. */
590 /* Wait until we instantiate templates before doing conversion. */
591 if (processing_template_decl)
594 if (warn_sequence_point)
595 verify_sequence_points (cond);
597 /* Do the conversion. */
598 cond = convert_from_reference (cond);
600 if (TREE_CODE (cond) == MODIFY_EXPR
601 && !TREE_NO_WARNING (cond)
604 warning (OPT_Wparentheses,
605 "suggest parentheses around assignment used as truth value");
606 TREE_NO_WARNING (cond) = 1;
609 return condition_conversion (cond);
612 /* Finish an expression-statement, whose EXPRESSION is as indicated. */
615 finish_expr_stmt (tree expr)
619 if (expr != NULL_TREE)
621 if (!processing_template_decl)
623 if (warn_sequence_point)
624 verify_sequence_points (expr);
625 expr = convert_to_void (expr, ICV_STATEMENT, tf_warning_or_error);
627 else if (!type_dependent_expression_p (expr))
628 convert_to_void (build_non_dependent_expr (expr), ICV_STATEMENT,
629 tf_warning_or_error);
631 if (check_for_bare_parameter_packs (expr))
632 expr = error_mark_node;
634 /* Simplification of inner statement expressions, compound exprs,
635 etc can result in us already having an EXPR_STMT. */
636 if (TREE_CODE (expr) != CLEANUP_POINT_EXPR)
638 if (TREE_CODE (expr) != EXPR_STMT)
639 expr = build_stmt (input_location, EXPR_STMT, expr);
640 expr = maybe_cleanup_point_expr_void (expr);
652 /* Begin an if-statement. Returns a newly created IF_STMT if
659 scope = do_pushlevel (sk_cond);
660 r = build_stmt (input_location, IF_STMT, NULL_TREE,
661 NULL_TREE, NULL_TREE, scope);
662 begin_cond (&IF_COND (r));
666 /* Process the COND of an if-statement, which may be given by
670 finish_if_stmt_cond (tree cond, tree if_stmt)
672 finish_cond (&IF_COND (if_stmt), maybe_convert_cond (cond));
674 THEN_CLAUSE (if_stmt) = push_stmt_list ();
677 /* Finish the then-clause of an if-statement, which may be given by
681 finish_then_clause (tree if_stmt)
683 THEN_CLAUSE (if_stmt) = pop_stmt_list (THEN_CLAUSE (if_stmt));
687 /* Begin the else-clause of an if-statement. */
690 begin_else_clause (tree if_stmt)
692 ELSE_CLAUSE (if_stmt) = push_stmt_list ();
695 /* Finish the else-clause of an if-statement, which may be given by
699 finish_else_clause (tree if_stmt)
701 ELSE_CLAUSE (if_stmt) = pop_stmt_list (ELSE_CLAUSE (if_stmt));
704 /* Finish an if-statement. */
707 finish_if_stmt (tree if_stmt)
709 tree scope = IF_SCOPE (if_stmt);
710 IF_SCOPE (if_stmt) = NULL;
711 add_stmt (do_poplevel (scope));
715 /* Begin a while-statement. Returns a newly created WHILE_STMT if
719 begin_while_stmt (void)
722 r = build_stmt (input_location, WHILE_STMT, NULL_TREE, NULL_TREE);
724 WHILE_BODY (r) = do_pushlevel (sk_block);
725 begin_cond (&WHILE_COND (r));
729 /* Process the COND of a while-statement, which may be given by
733 finish_while_stmt_cond (tree cond, tree while_stmt)
735 finish_cond (&WHILE_COND (while_stmt), maybe_convert_cond (cond));
736 simplify_loop_decl_cond (&WHILE_COND (while_stmt), WHILE_BODY (while_stmt));
739 /* Finish a while-statement, which may be given by WHILE_STMT. */
742 finish_while_stmt (tree while_stmt)
744 WHILE_BODY (while_stmt) = do_poplevel (WHILE_BODY (while_stmt));
748 /* Begin a do-statement. Returns a newly created DO_STMT if
754 tree r = build_stmt (input_location, DO_STMT, NULL_TREE, NULL_TREE);
756 DO_BODY (r) = push_stmt_list ();
760 /* Finish the body of a do-statement, which may be given by DO_STMT. */
763 finish_do_body (tree do_stmt)
765 tree body = DO_BODY (do_stmt) = pop_stmt_list (DO_BODY (do_stmt));
767 if (TREE_CODE (body) == STATEMENT_LIST && STATEMENT_LIST_TAIL (body))
768 body = STATEMENT_LIST_TAIL (body)->stmt;
770 if (IS_EMPTY_STMT (body))
771 warning (OPT_Wempty_body,
772 "suggest explicit braces around empty body in %<do%> statement");
775 /* Finish a do-statement, which may be given by DO_STMT, and whose
776 COND is as indicated. */
779 finish_do_stmt (tree cond, tree do_stmt)
781 cond = maybe_convert_cond (cond);
782 DO_COND (do_stmt) = cond;
786 /* Finish a return-statement. The EXPRESSION returned, if any, is as
790 finish_return_stmt (tree expr)
795 expr = check_return_expr (expr, &no_warning);
797 if (flag_openmp && !check_omp_return ())
798 return error_mark_node;
799 if (!processing_template_decl)
801 if (warn_sequence_point)
802 verify_sequence_points (expr);
804 if (DECL_DESTRUCTOR_P (current_function_decl)
805 || (DECL_CONSTRUCTOR_P (current_function_decl)
806 && targetm.cxx.cdtor_returns_this ()))
808 /* Similarly, all destructors must run destructors for
809 base-classes before returning. So, all returns in a
810 destructor get sent to the DTOR_LABEL; finish_function emits
811 code to return a value there. */
812 return finish_goto_stmt (cdtor_label);
816 r = build_stmt (input_location, RETURN_EXPR, expr);
817 TREE_NO_WARNING (r) |= no_warning;
818 r = maybe_cleanup_point_expr_void (r);
825 /* Begin the scope of a for-statement or a range-for-statement.
826 Both the returned trees are to be used in a call to
827 begin_for_stmt or begin_range_for_stmt. */
830 begin_for_scope (tree *init)
832 tree scope = NULL_TREE;
833 if (flag_new_for_scope > 0)
834 scope = do_pushlevel (sk_for);
836 if (processing_template_decl)
837 *init = push_stmt_list ();
844 /* Begin a for-statement. Returns a new FOR_STMT.
845 SCOPE and INIT should be the return of begin_for_scope,
849 begin_for_stmt (tree scope, tree init)
853 r = build_stmt (input_location, FOR_STMT, NULL_TREE, NULL_TREE,
854 NULL_TREE, NULL_TREE, NULL_TREE);
856 if (scope == NULL_TREE)
858 gcc_assert (!init || !(flag_new_for_scope > 0));
860 scope = begin_for_scope (&init);
862 FOR_INIT_STMT (r) = init;
863 FOR_SCOPE (r) = scope;
868 /* Finish the for-init-statement of a for-statement, which may be
869 given by FOR_STMT. */
872 finish_for_init_stmt (tree for_stmt)
874 if (processing_template_decl)
875 FOR_INIT_STMT (for_stmt) = pop_stmt_list (FOR_INIT_STMT (for_stmt));
877 FOR_BODY (for_stmt) = do_pushlevel (sk_block);
878 begin_cond (&FOR_COND (for_stmt));
881 /* Finish the COND of a for-statement, which may be given by
885 finish_for_cond (tree cond, tree for_stmt)
887 finish_cond (&FOR_COND (for_stmt), maybe_convert_cond (cond));
888 simplify_loop_decl_cond (&FOR_COND (for_stmt), FOR_BODY (for_stmt));
891 /* Finish the increment-EXPRESSION in a for-statement, which may be
892 given by FOR_STMT. */
895 finish_for_expr (tree expr, tree for_stmt)
899 /* If EXPR is an overloaded function, issue an error; there is no
900 context available to use to perform overload resolution. */
901 if (type_unknown_p (expr))
903 cxx_incomplete_type_error (expr, TREE_TYPE (expr));
904 expr = error_mark_node;
906 if (!processing_template_decl)
908 if (warn_sequence_point)
909 verify_sequence_points (expr);
910 expr = convert_to_void (expr, ICV_THIRD_IN_FOR,
911 tf_warning_or_error);
913 else if (!type_dependent_expression_p (expr))
914 convert_to_void (build_non_dependent_expr (expr), ICV_THIRD_IN_FOR,
915 tf_warning_or_error);
916 expr = maybe_cleanup_point_expr_void (expr);
917 if (check_for_bare_parameter_packs (expr))
918 expr = error_mark_node;
919 FOR_EXPR (for_stmt) = expr;
922 /* Finish the body of a for-statement, which may be given by
923 FOR_STMT. The increment-EXPR for the loop must be
925 It can also finish RANGE_FOR_STMT. */
928 finish_for_stmt (tree for_stmt)
930 if (TREE_CODE (for_stmt) == RANGE_FOR_STMT)
931 RANGE_FOR_BODY (for_stmt) = do_poplevel (RANGE_FOR_BODY (for_stmt));
933 FOR_BODY (for_stmt) = do_poplevel (FOR_BODY (for_stmt));
935 /* Pop the scope for the body of the loop. */
936 if (flag_new_for_scope > 0)
939 tree *scope_ptr = (TREE_CODE (for_stmt) == RANGE_FOR_STMT
940 ? &RANGE_FOR_SCOPE (for_stmt)
941 : &FOR_SCOPE (for_stmt));
944 add_stmt (do_poplevel (scope));
950 /* Begin a range-for-statement. Returns a new RANGE_FOR_STMT.
951 SCOPE and INIT should be the return of begin_for_scope,
953 To finish it call finish_for_stmt(). */
956 begin_range_for_stmt (tree scope, tree init)
960 r = build_stmt (input_location, RANGE_FOR_STMT,
961 NULL_TREE, NULL_TREE, NULL_TREE, NULL_TREE);
963 if (scope == NULL_TREE)
965 gcc_assert (!init || !(flag_new_for_scope > 0));
967 scope = begin_for_scope (&init);
970 /* RANGE_FOR_STMTs do not use nor save the init tree, so we
973 pop_stmt_list (init);
974 RANGE_FOR_SCOPE (r) = scope;
979 /* Finish the head of a range-based for statement, which may
980 be given by RANGE_FOR_STMT. DECL must be the declaration
981 and EXPR must be the loop expression. */
984 finish_range_for_decl (tree range_for_stmt, tree decl, tree expr)
986 RANGE_FOR_DECL (range_for_stmt) = decl;
987 RANGE_FOR_EXPR (range_for_stmt) = expr;
988 add_stmt (range_for_stmt);
989 RANGE_FOR_BODY (range_for_stmt) = do_pushlevel (sk_block);
992 /* Finish a break-statement. */
995 finish_break_stmt (void)
997 /* In switch statements break is sometimes stylistically used after
998 a return statement. This can lead to spurious warnings about
999 control reaching the end of a non-void function when it is
1000 inlined. Note that we are calling block_may_fallthru with
1001 language specific tree nodes; this works because
1002 block_may_fallthru returns true when given something it does not
1004 if (!block_may_fallthru (cur_stmt_list))
1005 return void_zero_node;
1006 return add_stmt (build_stmt (input_location, BREAK_STMT));
1009 /* Finish a continue-statement. */
1012 finish_continue_stmt (void)
1014 return add_stmt (build_stmt (input_location, CONTINUE_STMT));
1017 /* Begin a switch-statement. Returns a new SWITCH_STMT if
1021 begin_switch_stmt (void)
1025 scope = do_pushlevel (sk_cond);
1026 r = build_stmt (input_location, SWITCH_STMT, NULL_TREE, NULL_TREE, NULL_TREE, scope);
1028 begin_cond (&SWITCH_STMT_COND (r));
1033 /* Finish the cond of a switch-statement. */
1036 finish_switch_cond (tree cond, tree switch_stmt)
1038 tree orig_type = NULL;
1039 if (!processing_template_decl)
1041 /* Convert the condition to an integer or enumeration type. */
1042 cond = build_expr_type_conversion (WANT_INT | WANT_ENUM, cond, true);
1043 if (cond == NULL_TREE)
1045 error ("switch quantity not an integer");
1046 cond = error_mark_node;
1048 orig_type = TREE_TYPE (cond);
1049 if (cond != error_mark_node)
1053 Integral promotions are performed. */
1054 cond = perform_integral_promotions (cond);
1055 cond = maybe_cleanup_point_expr (cond);
1058 if (check_for_bare_parameter_packs (cond))
1059 cond = error_mark_node;
1060 else if (!processing_template_decl && warn_sequence_point)
1061 verify_sequence_points (cond);
1063 finish_cond (&SWITCH_STMT_COND (switch_stmt), cond);
1064 SWITCH_STMT_TYPE (switch_stmt) = orig_type;
1065 add_stmt (switch_stmt);
1066 push_switch (switch_stmt);
1067 SWITCH_STMT_BODY (switch_stmt) = push_stmt_list ();
1070 /* Finish the body of a switch-statement, which may be given by
1071 SWITCH_STMT. The COND to switch on is indicated. */
1074 finish_switch_stmt (tree switch_stmt)
1078 SWITCH_STMT_BODY (switch_stmt) =
1079 pop_stmt_list (SWITCH_STMT_BODY (switch_stmt));
1083 scope = SWITCH_STMT_SCOPE (switch_stmt);
1084 SWITCH_STMT_SCOPE (switch_stmt) = NULL;
1085 add_stmt (do_poplevel (scope));
1088 /* Begin a try-block. Returns a newly-created TRY_BLOCK if
1092 begin_try_block (void)
1094 tree r = build_stmt (input_location, TRY_BLOCK, NULL_TREE, NULL_TREE);
1096 TRY_STMTS (r) = push_stmt_list ();
1100 /* Likewise, for a function-try-block. The block returned in
1101 *COMPOUND_STMT is an artificial outer scope, containing the
1102 function-try-block. */
1105 begin_function_try_block (tree *compound_stmt)
1108 /* This outer scope does not exist in the C++ standard, but we need
1109 a place to put __FUNCTION__ and similar variables. */
1110 *compound_stmt = begin_compound_stmt (0);
1111 r = begin_try_block ();
1112 FN_TRY_BLOCK_P (r) = 1;
1116 /* Finish a try-block, which may be given by TRY_BLOCK. */
1119 finish_try_block (tree try_block)
1121 TRY_STMTS (try_block) = pop_stmt_list (TRY_STMTS (try_block));
1122 TRY_HANDLERS (try_block) = push_stmt_list ();
1125 /* Finish the body of a cleanup try-block, which may be given by
1129 finish_cleanup_try_block (tree try_block)
1131 TRY_STMTS (try_block) = pop_stmt_list (TRY_STMTS (try_block));
1134 /* Finish an implicitly generated try-block, with a cleanup is given
1138 finish_cleanup (tree cleanup, tree try_block)
1140 TRY_HANDLERS (try_block) = cleanup;
1141 CLEANUP_P (try_block) = 1;
1144 /* Likewise, for a function-try-block. */
1147 finish_function_try_block (tree try_block)
1149 finish_try_block (try_block);
1150 /* FIXME : something queer about CTOR_INITIALIZER somehow following
1151 the try block, but moving it inside. */
1152 in_function_try_handler = 1;
1155 /* Finish a handler-sequence for a try-block, which may be given by
1159 finish_handler_sequence (tree try_block)
1161 TRY_HANDLERS (try_block) = pop_stmt_list (TRY_HANDLERS (try_block));
1162 check_handlers (TRY_HANDLERS (try_block));
1165 /* Finish the handler-seq for a function-try-block, given by
1166 TRY_BLOCK. COMPOUND_STMT is the outer block created by
1167 begin_function_try_block. */
1170 finish_function_handler_sequence (tree try_block, tree compound_stmt)
1172 in_function_try_handler = 0;
1173 finish_handler_sequence (try_block);
1174 finish_compound_stmt (compound_stmt);
1177 /* Begin a handler. Returns a HANDLER if appropriate. */
1180 begin_handler (void)
1184 r = build_stmt (input_location, HANDLER, NULL_TREE, NULL_TREE);
1187 /* Create a binding level for the eh_info and the exception object
1189 HANDLER_BODY (r) = do_pushlevel (sk_catch);
1194 /* Finish the handler-parameters for a handler, which may be given by
1195 HANDLER. DECL is the declaration for the catch parameter, or NULL
1196 if this is a `catch (...)' clause. */
1199 finish_handler_parms (tree decl, tree handler)
1201 tree type = NULL_TREE;
1202 if (processing_template_decl)
1206 decl = pushdecl (decl);
1207 decl = push_template_decl (decl);
1208 HANDLER_PARMS (handler) = decl;
1209 type = TREE_TYPE (decl);
1213 type = expand_start_catch_block (decl);
1214 HANDLER_TYPE (handler) = type;
1215 if (!processing_template_decl && type)
1216 mark_used (eh_type_info (type));
1219 /* Finish a handler, which may be given by HANDLER. The BLOCKs are
1220 the return value from the matching call to finish_handler_parms. */
1223 finish_handler (tree handler)
1225 if (!processing_template_decl)
1226 expand_end_catch_block ();
1227 HANDLER_BODY (handler) = do_poplevel (HANDLER_BODY (handler));
1230 /* Begin a compound statement. FLAGS contains some bits that control the
1231 behavior and context. If BCS_NO_SCOPE is set, the compound statement
1232 does not define a scope. If BCS_FN_BODY is set, this is the outermost
1233 block of a function. If BCS_TRY_BLOCK is set, this is the block
1234 created on behalf of a TRY statement. Returns a token to be passed to
1235 finish_compound_stmt. */
1238 begin_compound_stmt (unsigned int flags)
1242 if (flags & BCS_NO_SCOPE)
1244 r = push_stmt_list ();
1245 STATEMENT_LIST_NO_SCOPE (r) = 1;
1247 /* Normally, we try hard to keep the BLOCK for a statement-expression.
1248 But, if it's a statement-expression with a scopeless block, there's
1249 nothing to keep, and we don't want to accidentally keep a block
1250 *inside* the scopeless block. */
1251 keep_next_level (false);
1254 r = do_pushlevel (flags & BCS_TRY_BLOCK ? sk_try : sk_block);
1256 /* When processing a template, we need to remember where the braces were,
1257 so that we can set up identical scopes when instantiating the template
1258 later. BIND_EXPR is a handy candidate for this.
1259 Note that do_poplevel won't create a BIND_EXPR itself here (and thus
1260 result in nested BIND_EXPRs), since we don't build BLOCK nodes when
1261 processing templates. */
1262 if (processing_template_decl)
1264 r = build3 (BIND_EXPR, NULL, NULL, r, NULL);
1265 BIND_EXPR_TRY_BLOCK (r) = (flags & BCS_TRY_BLOCK) != 0;
1266 BIND_EXPR_BODY_BLOCK (r) = (flags & BCS_FN_BODY) != 0;
1267 TREE_SIDE_EFFECTS (r) = 1;
1273 /* Finish a compound-statement, which is given by STMT. */
1276 finish_compound_stmt (tree stmt)
1278 if (TREE_CODE (stmt) == BIND_EXPR)
1280 tree body = do_poplevel (BIND_EXPR_BODY (stmt));
1281 /* If the STATEMENT_LIST is empty and this BIND_EXPR isn't special,
1282 discard the BIND_EXPR so it can be merged with the containing
1284 if (TREE_CODE (body) == STATEMENT_LIST
1285 && STATEMENT_LIST_HEAD (body) == NULL
1286 && !BIND_EXPR_BODY_BLOCK (stmt)
1287 && !BIND_EXPR_TRY_BLOCK (stmt))
1290 BIND_EXPR_BODY (stmt) = body;
1292 else if (STATEMENT_LIST_NO_SCOPE (stmt))
1293 stmt = pop_stmt_list (stmt);
1296 /* Destroy any ObjC "super" receivers that may have been
1298 objc_clear_super_receiver ();
1300 stmt = do_poplevel (stmt);
1303 /* ??? See c_end_compound_stmt wrt statement expressions. */
1308 /* Finish an asm-statement, whose components are a STRING, some
1309 OUTPUT_OPERANDS, some INPUT_OPERANDS, some CLOBBERS and some
1310 LABELS. Also note whether the asm-statement should be
1311 considered volatile. */
1314 finish_asm_stmt (int volatile_p, tree string, tree output_operands,
1315 tree input_operands, tree clobbers, tree labels)
1319 int ninputs = list_length (input_operands);
1320 int noutputs = list_length (output_operands);
1322 if (!processing_template_decl)
1324 const char *constraint;
1325 const char **oconstraints;
1326 bool allows_mem, allows_reg, is_inout;
1330 oconstraints = XALLOCAVEC (const char *, noutputs);
1332 string = resolve_asm_operand_names (string, output_operands,
1333 input_operands, labels);
1335 for (i = 0, t = output_operands; t; t = TREE_CHAIN (t), ++i)
1337 operand = TREE_VALUE (t);
1339 /* ??? Really, this should not be here. Users should be using a
1340 proper lvalue, dammit. But there's a long history of using
1341 casts in the output operands. In cases like longlong.h, this
1342 becomes a primitive form of typechecking -- if the cast can be
1343 removed, then the output operand had a type of the proper width;
1344 otherwise we'll get an error. Gross, but ... */
1345 STRIP_NOPS (operand);
1347 operand = mark_lvalue_use (operand);
1349 if (!lvalue_or_else (operand, lv_asm, tf_warning_or_error))
1350 operand = error_mark_node;
1352 if (operand != error_mark_node
1353 && (TREE_READONLY (operand)
1354 || CP_TYPE_CONST_P (TREE_TYPE (operand))
1355 /* Functions are not modifiable, even though they are
1357 || TREE_CODE (TREE_TYPE (operand)) == FUNCTION_TYPE
1358 || TREE_CODE (TREE_TYPE (operand)) == METHOD_TYPE
1359 /* If it's an aggregate and any field is const, then it is
1360 effectively const. */
1361 || (CLASS_TYPE_P (TREE_TYPE (operand))
1362 && C_TYPE_FIELDS_READONLY (TREE_TYPE (operand)))))
1363 cxx_readonly_error (operand, lv_asm);
1365 constraint = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (t)));
1366 oconstraints[i] = constraint;
1368 if (parse_output_constraint (&constraint, i, ninputs, noutputs,
1369 &allows_mem, &allows_reg, &is_inout))
1371 /* If the operand is going to end up in memory,
1372 mark it addressable. */
1373 if (!allows_reg && !cxx_mark_addressable (operand))
1374 operand = error_mark_node;
1377 operand = error_mark_node;
1379 TREE_VALUE (t) = operand;
1382 for (i = 0, t = input_operands; t; ++i, t = TREE_CHAIN (t))
1384 constraint = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (t)));
1385 operand = decay_conversion (TREE_VALUE (t));
1387 /* If the type of the operand hasn't been determined (e.g.,
1388 because it involves an overloaded function), then issue
1389 an error message. There's no context available to
1390 resolve the overloading. */
1391 if (TREE_TYPE (operand) == unknown_type_node)
1393 error ("type of asm operand %qE could not be determined",
1395 operand = error_mark_node;
1398 if (parse_input_constraint (&constraint, i, ninputs, noutputs, 0,
1399 oconstraints, &allows_mem, &allows_reg))
1401 /* If the operand is going to end up in memory,
1402 mark it addressable. */
1403 if (!allows_reg && allows_mem)
1405 /* Strip the nops as we allow this case. FIXME, this really
1406 should be rejected or made deprecated. */
1407 STRIP_NOPS (operand);
1408 if (!cxx_mark_addressable (operand))
1409 operand = error_mark_node;
1413 operand = error_mark_node;
1415 TREE_VALUE (t) = operand;
1419 r = build_stmt (input_location, ASM_EXPR, string,
1420 output_operands, input_operands,
1422 ASM_VOLATILE_P (r) = volatile_p || noutputs == 0;
1423 r = maybe_cleanup_point_expr_void (r);
1424 return add_stmt (r);
1427 /* Finish a label with the indicated NAME. Returns the new label. */
1430 finish_label_stmt (tree name)
1432 tree decl = define_label (input_location, name);
1434 if (decl == error_mark_node)
1435 return error_mark_node;
1437 add_stmt (build_stmt (input_location, LABEL_EXPR, decl));
1442 /* Finish a series of declarations for local labels. G++ allows users
1443 to declare "local" labels, i.e., labels with scope. This extension
1444 is useful when writing code involving statement-expressions. */
1447 finish_label_decl (tree name)
1449 if (!at_function_scope_p ())
1451 error ("__label__ declarations are only allowed in function scopes");
1455 add_decl_expr (declare_local_label (name));
1458 /* When DECL goes out of scope, make sure that CLEANUP is executed. */
1461 finish_decl_cleanup (tree decl, tree cleanup)
1463 push_cleanup (decl, cleanup, false);
1466 /* If the current scope exits with an exception, run CLEANUP. */
1469 finish_eh_cleanup (tree cleanup)
1471 push_cleanup (NULL, cleanup, true);
1474 /* The MEM_INITS is a list of mem-initializers, in reverse of the
1475 order they were written by the user. Each node is as for
1476 emit_mem_initializers. */
1479 finish_mem_initializers (tree mem_inits)
1481 /* Reorder the MEM_INITS so that they are in the order they appeared
1482 in the source program. */
1483 mem_inits = nreverse (mem_inits);
1485 if (processing_template_decl)
1489 for (mem = mem_inits; mem; mem = TREE_CHAIN (mem))
1491 /* If the TREE_PURPOSE is a TYPE_PACK_EXPANSION, skip the
1492 check for bare parameter packs in the TREE_VALUE, because
1493 any parameter packs in the TREE_VALUE have already been
1494 bound as part of the TREE_PURPOSE. See
1495 make_pack_expansion for more information. */
1496 if (TREE_CODE (TREE_PURPOSE (mem)) != TYPE_PACK_EXPANSION
1497 && check_for_bare_parameter_packs (TREE_VALUE (mem)))
1498 TREE_VALUE (mem) = error_mark_node;
1501 add_stmt (build_min_nt (CTOR_INITIALIZER, mem_inits));
1504 emit_mem_initializers (mem_inits);
1507 /* Finish a parenthesized expression EXPR. */
1510 finish_parenthesized_expr (tree expr)
1513 /* This inhibits warnings in c_common_truthvalue_conversion. */
1514 TREE_NO_WARNING (expr) = 1;
1516 if (TREE_CODE (expr) == OFFSET_REF
1517 || TREE_CODE (expr) == SCOPE_REF)
1518 /* [expr.unary.op]/3 The qualified id of a pointer-to-member must not be
1519 enclosed in parentheses. */
1520 PTRMEM_OK_P (expr) = 0;
1522 if (TREE_CODE (expr) == STRING_CST)
1523 PAREN_STRING_LITERAL_P (expr) = 1;
1528 /* Finish a reference to a non-static data member (DECL) that is not
1529 preceded by `.' or `->'. */
1532 finish_non_static_data_member (tree decl, tree object, tree qualifying_scope)
1534 gcc_assert (TREE_CODE (decl) == FIELD_DECL);
1538 tree scope = qualifying_scope;
1539 if (scope == NULL_TREE)
1540 scope = context_for_name_lookup (decl);
1541 object = maybe_dummy_object (scope, NULL);
1544 if (object == error_mark_node)
1545 return error_mark_node;
1547 /* DR 613: Can use non-static data members without an associated
1548 object in sizeof/decltype/alignof. */
1549 if (is_dummy_object (object) && cp_unevaluated_operand == 0
1550 && (!processing_template_decl || !current_class_ref))
1552 if (current_function_decl
1553 && DECL_STATIC_FUNCTION_P (current_function_decl))
1554 error ("invalid use of member %q+D in static member function", decl);
1556 error ("invalid use of non-static data member %q+D", decl);
1557 error ("from this location");
1559 return error_mark_node;
1562 if (current_class_ptr)
1563 TREE_USED (current_class_ptr) = 1;
1564 if (processing_template_decl && !qualifying_scope)
1566 tree type = TREE_TYPE (decl);
1568 if (TREE_CODE (type) == REFERENCE_TYPE)
1569 /* Quals on the object don't matter. */;
1572 /* Set the cv qualifiers. */
1573 int quals = (current_class_ref
1574 ? cp_type_quals (TREE_TYPE (current_class_ref))
1575 : TYPE_UNQUALIFIED);
1577 if (DECL_MUTABLE_P (decl))
1578 quals &= ~TYPE_QUAL_CONST;
1580 quals |= cp_type_quals (TREE_TYPE (decl));
1581 type = cp_build_qualified_type (type, quals);
1584 return (convert_from_reference
1585 (build_min (COMPONENT_REF, type, object, decl, NULL_TREE)));
1587 /* If PROCESSING_TEMPLATE_DECL is nonzero here, then
1588 QUALIFYING_SCOPE is also non-null. Wrap this in a SCOPE_REF
1590 else if (processing_template_decl)
1591 return build_qualified_name (TREE_TYPE (decl),
1594 /*template_p=*/false);
1597 tree access_type = TREE_TYPE (object);
1599 perform_or_defer_access_check (TYPE_BINFO (access_type), decl,
1602 /* If the data member was named `C::M', convert `*this' to `C'
1604 if (qualifying_scope)
1606 tree binfo = NULL_TREE;
1607 object = build_scoped_ref (object, qualifying_scope,
1611 return build_class_member_access_expr (object, decl,
1612 /*access_path=*/NULL_TREE,
1613 /*preserve_reference=*/false,
1614 tf_warning_or_error);
1618 /* If we are currently parsing a template and we encountered a typedef
1619 TYPEDEF_DECL that is being accessed though CONTEXT, this function
1620 adds the typedef to a list tied to the current template.
1621 At tempate instantiatin time, that list is walked and access check
1622 performed for each typedef.
1623 LOCATION is the location of the usage point of TYPEDEF_DECL. */
1626 add_typedef_to_current_template_for_access_check (tree typedef_decl,
1628 location_t location)
1630 tree template_info = NULL;
1631 tree cs = current_scope ();
1633 if (!is_typedef_decl (typedef_decl)
1635 || !CLASS_TYPE_P (context)
1639 if (CLASS_TYPE_P (cs) || TREE_CODE (cs) == FUNCTION_DECL)
1640 template_info = get_template_info (cs);
1643 && TI_TEMPLATE (template_info)
1644 && !currently_open_class (context))
1645 append_type_to_template_for_access_check (cs, typedef_decl,
1649 /* DECL was the declaration to which a qualified-id resolved. Issue
1650 an error message if it is not accessible. If OBJECT_TYPE is
1651 non-NULL, we have just seen `x->' or `x.' and OBJECT_TYPE is the
1652 type of `*x', or `x', respectively. If the DECL was named as
1653 `A::B' then NESTED_NAME_SPECIFIER is `A'. */
1656 check_accessibility_of_qualified_id (tree decl,
1658 tree nested_name_specifier)
1661 tree qualifying_type = NULL_TREE;
1663 /* If we are parsing a template declaration and if decl is a typedef,
1664 add it to a list tied to the template.
1665 At template instantiation time, that list will be walked and
1666 access check performed. */
1667 add_typedef_to_current_template_for_access_check (decl,
1668 nested_name_specifier
1669 ? nested_name_specifier
1670 : DECL_CONTEXT (decl),
1673 /* If we're not checking, return immediately. */
1674 if (deferred_access_no_check)
1677 /* Determine the SCOPE of DECL. */
1678 scope = context_for_name_lookup (decl);
1679 /* If the SCOPE is not a type, then DECL is not a member. */
1680 if (!TYPE_P (scope))
1682 /* Compute the scope through which DECL is being accessed. */
1684 /* OBJECT_TYPE might not be a class type; consider:
1686 class A { typedef int I; };
1690 In this case, we will have "A::I" as the DECL, but "I" as the
1692 && CLASS_TYPE_P (object_type)
1693 && DERIVED_FROM_P (scope, object_type))
1694 /* If we are processing a `->' or `.' expression, use the type of the
1696 qualifying_type = object_type;
1697 else if (nested_name_specifier)
1699 /* If the reference is to a non-static member of the
1700 current class, treat it as if it were referenced through
1702 if (DECL_NONSTATIC_MEMBER_P (decl)
1703 && current_class_ptr
1704 && DERIVED_FROM_P (scope, current_class_type))
1705 qualifying_type = current_class_type;
1706 /* Otherwise, use the type indicated by the
1707 nested-name-specifier. */
1709 qualifying_type = nested_name_specifier;
1712 /* Otherwise, the name must be from the current class or one of
1714 qualifying_type = currently_open_derived_class (scope);
1717 /* It is possible for qualifying type to be a TEMPLATE_TYPE_PARM
1718 or similar in a default argument value. */
1719 && CLASS_TYPE_P (qualifying_type)
1720 && !dependent_type_p (qualifying_type))
1721 perform_or_defer_access_check (TYPE_BINFO (qualifying_type), decl,
1725 /* EXPR is the result of a qualified-id. The QUALIFYING_CLASS was the
1726 class named to the left of the "::" operator. DONE is true if this
1727 expression is a complete postfix-expression; it is false if this
1728 expression is followed by '->', '[', '(', etc. ADDRESS_P is true
1729 iff this expression is the operand of '&'. TEMPLATE_P is true iff
1730 the qualified-id was of the form "A::template B". TEMPLATE_ARG_P
1731 is true iff this qualified name appears as a template argument. */
1734 finish_qualified_id_expr (tree qualifying_class,
1739 bool template_arg_p)
1741 gcc_assert (TYPE_P (qualifying_class));
1743 if (error_operand_p (expr))
1744 return error_mark_node;
1746 if (DECL_P (expr) || BASELINK_P (expr))
1750 check_template_keyword (expr);
1752 /* If EXPR occurs as the operand of '&', use special handling that
1753 permits a pointer-to-member. */
1754 if (address_p && done)
1756 if (TREE_CODE (expr) == SCOPE_REF)
1757 expr = TREE_OPERAND (expr, 1);
1758 expr = build_offset_ref (qualifying_class, expr,
1759 /*address_p=*/true);
1763 /* Within the scope of a class, turn references to non-static
1764 members into expression of the form "this->...". */
1766 /* But, within a template argument, we do not want make the
1767 transformation, as there is no "this" pointer. */
1769 else if (TREE_CODE (expr) == FIELD_DECL)
1771 push_deferring_access_checks (dk_no_check);
1772 expr = finish_non_static_data_member (expr, NULL_TREE,
1774 pop_deferring_access_checks ();
1776 else if (BASELINK_P (expr) && !processing_template_decl)
1780 /* See if any of the functions are non-static members. */
1781 /* If so, the expression may be relative to 'this'. */
1782 if (!shared_member_p (expr)
1783 && (ob = maybe_dummy_object (qualifying_class, NULL),
1784 !is_dummy_object (ob)))
1785 expr = (build_class_member_access_expr
1788 BASELINK_ACCESS_BINFO (expr),
1789 /*preserve_reference=*/false,
1790 tf_warning_or_error));
1792 /* The expression is a qualified name whose address is not
1794 expr = build_offset_ref (qualifying_class, expr, /*address_p=*/false);
1800 /* Begin a statement-expression. The value returned must be passed to
1801 finish_stmt_expr. */
1804 begin_stmt_expr (void)
1806 return push_stmt_list ();
1809 /* Process the final expression of a statement expression. EXPR can be
1810 NULL, if the final expression is empty. Return a STATEMENT_LIST
1811 containing all the statements in the statement-expression, or
1812 ERROR_MARK_NODE if there was an error. */
1815 finish_stmt_expr_expr (tree expr, tree stmt_expr)
1817 if (error_operand_p (expr))
1819 /* The type of the statement-expression is the type of the last
1821 TREE_TYPE (stmt_expr) = error_mark_node;
1822 return error_mark_node;
1825 /* If the last statement does not have "void" type, then the value
1826 of the last statement is the value of the entire expression. */
1829 tree type = TREE_TYPE (expr);
1831 if (processing_template_decl)
1833 expr = build_stmt (input_location, EXPR_STMT, expr);
1834 expr = add_stmt (expr);
1835 /* Mark the last statement so that we can recognize it as such at
1836 template-instantiation time. */
1837 EXPR_STMT_STMT_EXPR_RESULT (expr) = 1;
1839 else if (VOID_TYPE_P (type))
1841 /* Just treat this like an ordinary statement. */
1842 expr = finish_expr_stmt (expr);
1846 /* It actually has a value we need to deal with. First, force it
1847 to be an rvalue so that we won't need to build up a copy
1848 constructor call later when we try to assign it to something. */
1849 expr = force_rvalue (expr, tf_warning_or_error);
1850 if (error_operand_p (expr))
1851 return error_mark_node;
1853 /* Update for array-to-pointer decay. */
1854 type = TREE_TYPE (expr);
1856 /* Wrap it in a CLEANUP_POINT_EXPR and add it to the list like a
1857 normal statement, but don't convert to void or actually add
1859 if (TREE_CODE (expr) != CLEANUP_POINT_EXPR)
1860 expr = maybe_cleanup_point_expr (expr);
1864 /* The type of the statement-expression is the type of the last
1866 TREE_TYPE (stmt_expr) = type;
1872 /* Finish a statement-expression. EXPR should be the value returned
1873 by the previous begin_stmt_expr. Returns an expression
1874 representing the statement-expression. */
1877 finish_stmt_expr (tree stmt_expr, bool has_no_scope)
1882 if (error_operand_p (stmt_expr))
1884 pop_stmt_list (stmt_expr);
1885 return error_mark_node;
1888 gcc_assert (TREE_CODE (stmt_expr) == STATEMENT_LIST);
1890 type = TREE_TYPE (stmt_expr);
1891 result = pop_stmt_list (stmt_expr);
1892 TREE_TYPE (result) = type;
1894 if (processing_template_decl)
1896 result = build_min (STMT_EXPR, type, result);
1897 TREE_SIDE_EFFECTS (result) = 1;
1898 STMT_EXPR_NO_SCOPE (result) = has_no_scope;
1900 else if (CLASS_TYPE_P (type))
1902 /* Wrap the statement-expression in a TARGET_EXPR so that the
1903 temporary object created by the final expression is destroyed at
1904 the end of the full-expression containing the
1905 statement-expression. */
1906 result = force_target_expr (type, result, tf_warning_or_error);
1912 /* Returns the expression which provides the value of STMT_EXPR. */
1915 stmt_expr_value_expr (tree stmt_expr)
1917 tree t = STMT_EXPR_STMT (stmt_expr);
1919 if (TREE_CODE (t) == BIND_EXPR)
1920 t = BIND_EXPR_BODY (t);
1922 if (TREE_CODE (t) == STATEMENT_LIST && STATEMENT_LIST_TAIL (t))
1923 t = STATEMENT_LIST_TAIL (t)->stmt;
1925 if (TREE_CODE (t) == EXPR_STMT)
1926 t = EXPR_STMT_EXPR (t);
1931 /* Return TRUE iff EXPR_STMT is an empty list of
1932 expression statements. */
1935 empty_expr_stmt_p (tree expr_stmt)
1937 tree body = NULL_TREE;
1939 if (expr_stmt == void_zero_node)
1944 if (TREE_CODE (expr_stmt) == EXPR_STMT)
1945 body = EXPR_STMT_EXPR (expr_stmt);
1946 else if (TREE_CODE (expr_stmt) == STATEMENT_LIST)
1952 if (TREE_CODE (body) == STATEMENT_LIST)
1953 return tsi_end_p (tsi_start (body));
1955 return empty_expr_stmt_p (body);
1960 /* Perform Koenig lookup. FN is the postfix-expression representing
1961 the function (or functions) to call; ARGS are the arguments to the
1962 call; if INCLUDE_STD then the `std' namespace is automatically
1963 considered an associated namespace (used in range-based for loops).
1964 Returns the functions to be considered by overload resolution. */
1967 perform_koenig_lookup (tree fn, VEC(tree,gc) *args, bool include_std,
1968 tsubst_flags_t complain)
1970 tree identifier = NULL_TREE;
1971 tree functions = NULL_TREE;
1972 tree tmpl_args = NULL_TREE;
1973 bool template_id = false;
1975 if (TREE_CODE (fn) == TEMPLATE_ID_EXPR)
1977 /* Use a separate flag to handle null args. */
1979 tmpl_args = TREE_OPERAND (fn, 1);
1980 fn = TREE_OPERAND (fn, 0);
1983 /* Find the name of the overloaded function. */
1984 if (TREE_CODE (fn) == IDENTIFIER_NODE)
1986 else if (is_overloaded_fn (fn))
1989 identifier = DECL_NAME (get_first_fn (functions));
1991 else if (DECL_P (fn))
1994 identifier = DECL_NAME (fn);
1997 /* A call to a namespace-scope function using an unqualified name.
1999 Do Koenig lookup -- unless any of the arguments are
2001 if (!any_type_dependent_arguments_p (args)
2002 && !any_dependent_template_arguments_p (tmpl_args))
2004 fn = lookup_arg_dependent (identifier, functions, args, include_std);
2007 /* The unqualified name could not be resolved. */
2009 fn = unqualified_fn_lookup_error (identifier);
2015 if (fn && template_id)
2016 fn = build2 (TEMPLATE_ID_EXPR, unknown_type_node, fn, tmpl_args);
2021 /* Generate an expression for `FN (ARGS)'. This may change the
2024 If DISALLOW_VIRTUAL is true, the call to FN will be not generated
2025 as a virtual call, even if FN is virtual. (This flag is set when
2026 encountering an expression where the function name is explicitly
2027 qualified. For example a call to `X::f' never generates a virtual
2030 Returns code for the call. */
2033 finish_call_expr (tree fn, VEC(tree,gc) **args, bool disallow_virtual,
2034 bool koenig_p, tsubst_flags_t complain)
2038 VEC(tree,gc) *orig_args = NULL;
2040 if (fn == error_mark_node)
2041 return error_mark_node;
2043 gcc_assert (!TYPE_P (fn));
2047 if (processing_template_decl)
2049 /* If the call expression is dependent, build a CALL_EXPR node
2050 with no type; type_dependent_expression_p recognizes
2051 expressions with no type as being dependent. */
2052 if (type_dependent_expression_p (fn)
2053 || any_type_dependent_arguments_p (*args)
2054 /* For a non-static member function that doesn't have an
2055 explicit object argument, we need to specifically
2056 test the type dependency of the "this" pointer because it
2057 is not included in *ARGS even though it is considered to
2058 be part of the list of arguments. Note that this is
2059 related to CWG issues 515 and 1005. */
2060 || (TREE_CODE (fn) != COMPONENT_REF
2061 && non_static_member_function_p (fn)
2062 && current_class_ref
2063 && type_dependent_expression_p (current_class_ref)))
2065 result = build_nt_call_vec (fn, *args);
2066 KOENIG_LOOKUP_P (result) = koenig_p;
2071 tree fndecl = OVL_CURRENT (fn);
2072 if (TREE_CODE (fndecl) != FUNCTION_DECL
2073 || !TREE_THIS_VOLATILE (fndecl))
2079 current_function_returns_abnormally = 1;
2083 orig_args = make_tree_vector_copy (*args);
2084 if (!BASELINK_P (fn)
2085 && TREE_CODE (fn) != PSEUDO_DTOR_EXPR
2086 && TREE_TYPE (fn) != unknown_type_node)
2087 fn = build_non_dependent_expr (fn);
2088 make_args_non_dependent (*args);
2091 if (TREE_CODE (fn) == COMPONENT_REF)
2093 tree member = TREE_OPERAND (fn, 1);
2094 if (BASELINK_P (member))
2096 tree object = TREE_OPERAND (fn, 0);
2097 return build_new_method_call (object, member,
2100 ? LOOKUP_NORMAL | LOOKUP_NONVIRTUAL
2107 if (is_overloaded_fn (fn))
2108 fn = baselink_for_fns (fn);
2111 if (BASELINK_P (fn))
2115 /* A call to a member function. From [over.call.func]:
2117 If the keyword this is in scope and refers to the class of
2118 that member function, or a derived class thereof, then the
2119 function call is transformed into a qualified function call
2120 using (*this) as the postfix-expression to the left of the
2121 . operator.... [Otherwise] a contrived object of type T
2122 becomes the implied object argument.
2126 struct A { void f(); };
2127 struct B : public A {};
2128 struct C : public A { void g() { B::f(); }};
2130 "the class of that member function" refers to `A'. But 11.2
2131 [class.access.base] says that we need to convert 'this' to B* as
2132 part of the access, so we pass 'B' to maybe_dummy_object. */
2134 object = maybe_dummy_object (BINFO_TYPE (BASELINK_ACCESS_BINFO (fn)),
2137 if (processing_template_decl)
2139 if (type_dependent_expression_p (object))
2141 tree ret = build_nt_call_vec (orig_fn, orig_args);
2142 release_tree_vector (orig_args);
2145 object = build_non_dependent_expr (object);
2148 result = build_new_method_call (object, fn, args, NULL_TREE,
2150 ? LOOKUP_NORMAL|LOOKUP_NONVIRTUAL
2155 else if (is_overloaded_fn (fn))
2157 /* If the function is an overloaded builtin, resolve it. */
2158 if (TREE_CODE (fn) == FUNCTION_DECL
2159 && (DECL_BUILT_IN_CLASS (fn) == BUILT_IN_NORMAL
2160 || DECL_BUILT_IN_CLASS (fn) == BUILT_IN_MD))
2161 result = resolve_overloaded_builtin (input_location, fn, *args);
2164 /* A call to a namespace-scope function. */
2165 result = build_new_function_call (fn, args, koenig_p, complain);
2167 else if (TREE_CODE (fn) == PSEUDO_DTOR_EXPR)
2169 if (!VEC_empty (tree, *args))
2170 error ("arguments to destructor are not allowed");
2171 /* Mark the pseudo-destructor call as having side-effects so
2172 that we do not issue warnings about its use. */
2173 result = build1 (NOP_EXPR,
2175 TREE_OPERAND (fn, 0));
2176 TREE_SIDE_EFFECTS (result) = 1;
2178 else if (CLASS_TYPE_P (TREE_TYPE (fn)))
2179 /* If the "function" is really an object of class type, it might
2180 have an overloaded `operator ()'. */
2181 result = build_op_call (fn, args, complain);
2184 /* A call where the function is unknown. */
2185 result = cp_build_function_call_vec (fn, args, complain);
2187 if (processing_template_decl && result != error_mark_node)
2189 if (TREE_CODE (result) == INDIRECT_REF)
2190 result = TREE_OPERAND (result, 0);
2191 result = build_call_vec (TREE_TYPE (result), orig_fn, orig_args);
2192 SET_EXPR_LOCATION (result, input_location);
2193 KOENIG_LOOKUP_P (result) = koenig_p;
2194 release_tree_vector (orig_args);
2195 result = convert_from_reference (result);
2200 /* Free garbage OVERLOADs from arg-dependent lookup. */
2201 tree next = NULL_TREE;
2203 fn && TREE_CODE (fn) == OVERLOAD && OVL_ARG_DEPENDENT (fn);
2206 if (processing_template_decl)
2207 /* In a template, we'll re-use them at instantiation time. */
2208 OVL_ARG_DEPENDENT (fn) = false;
2211 next = OVL_CHAIN (fn);
2220 /* Finish a call to a postfix increment or decrement or EXPR. (Which
2221 is indicated by CODE, which should be POSTINCREMENT_EXPR or
2222 POSTDECREMENT_EXPR.) */
2225 finish_increment_expr (tree expr, enum tree_code code)
2227 return build_x_unary_op (code, expr, tf_warning_or_error);
2230 /* Finish a use of `this'. Returns an expression for `this'. */
2233 finish_this_expr (void)
2237 if (current_class_ptr)
2239 tree type = TREE_TYPE (current_class_ref);
2241 /* In a lambda expression, 'this' refers to the captured 'this'. */
2242 if (LAMBDA_TYPE_P (type))
2243 result = lambda_expr_this_capture (CLASSTYPE_LAMBDA_EXPR (type));
2245 result = current_class_ptr;
2248 else if (current_function_decl
2249 && DECL_STATIC_FUNCTION_P (current_function_decl))
2251 error ("%<this%> is unavailable for static member functions");
2252 result = error_mark_node;
2256 if (current_function_decl)
2257 error ("invalid use of %<this%> in non-member function");
2259 error ("invalid use of %<this%> at top level");
2260 result = error_mark_node;
2266 /* Finish a pseudo-destructor expression. If SCOPE is NULL, the
2267 expression was of the form `OBJECT.~DESTRUCTOR' where DESTRUCTOR is
2268 the TYPE for the type given. If SCOPE is non-NULL, the expression
2269 was of the form `OBJECT.SCOPE::~DESTRUCTOR'. */
2272 finish_pseudo_destructor_expr (tree object, tree scope, tree destructor)
2274 if (object == error_mark_node || destructor == error_mark_node)
2275 return error_mark_node;
2277 gcc_assert (TYPE_P (destructor));
2279 if (!processing_template_decl)
2281 if (scope == error_mark_node)
2283 error ("invalid qualifying scope in pseudo-destructor name");
2284 return error_mark_node;
2286 if (scope && TYPE_P (scope) && !check_dtor_name (scope, destructor))
2288 error ("qualified type %qT does not match destructor name ~%qT",
2290 return error_mark_node;
2294 /* [expr.pseudo] says both:
2296 The type designated by the pseudo-destructor-name shall be
2297 the same as the object type.
2301 The cv-unqualified versions of the object type and of the
2302 type designated by the pseudo-destructor-name shall be the
2305 We implement the more generous second sentence, since that is
2306 what most other compilers do. */
2307 if (!same_type_ignoring_top_level_qualifiers_p (TREE_TYPE (object),
2310 error ("%qE is not of type %qT", object, destructor);
2311 return error_mark_node;
2315 return build3 (PSEUDO_DTOR_EXPR, void_type_node, object, scope, destructor);
2318 /* Finish an expression of the form CODE EXPR. */
2321 finish_unary_op_expr (enum tree_code code, tree expr)
2323 tree result = build_x_unary_op (code, expr, tf_warning_or_error);
2324 if (TREE_OVERFLOW_P (result) && !TREE_OVERFLOW_P (expr))
2325 overflow_warning (input_location, result);
2330 /* Finish a compound-literal expression. TYPE is the type to which
2331 the CONSTRUCTOR in COMPOUND_LITERAL is being cast. */
2334 finish_compound_literal (tree type, tree compound_literal,
2335 tsubst_flags_t complain)
2337 if (type == error_mark_node)
2338 return error_mark_node;
2340 if (TREE_CODE (type) == REFERENCE_TYPE)
2343 = finish_compound_literal (TREE_TYPE (type), compound_literal,
2345 return cp_build_c_cast (type, compound_literal, complain);
2348 if (!TYPE_OBJ_P (type))
2350 if (complain & tf_error)
2351 error ("compound literal of non-object type %qT", type);
2352 return error_mark_node;
2355 if (processing_template_decl)
2357 TREE_TYPE (compound_literal) = type;
2358 /* Mark the expression as a compound literal. */
2359 TREE_HAS_CONSTRUCTOR (compound_literal) = 1;
2360 return compound_literal;
2363 type = complete_type (type);
2365 if (TYPE_NON_AGGREGATE_CLASS (type))
2367 /* Trying to deal with a CONSTRUCTOR instead of a TREE_LIST
2368 everywhere that deals with function arguments would be a pain, so
2369 just wrap it in a TREE_LIST. The parser set a flag so we know
2370 that it came from T{} rather than T({}). */
2371 CONSTRUCTOR_IS_DIRECT_INIT (compound_literal) = 1;
2372 compound_literal = build_tree_list (NULL_TREE, compound_literal);
2373 return build_functional_cast (type, compound_literal, complain);
2376 if (TREE_CODE (type) == ARRAY_TYPE
2377 && check_array_initializer (NULL_TREE, type, compound_literal))
2378 return error_mark_node;
2379 compound_literal = reshape_init (type, compound_literal, complain);
2380 if (SCALAR_TYPE_P (type)
2381 && !BRACE_ENCLOSED_INITIALIZER_P (compound_literal)
2382 && (complain & tf_warning_or_error))
2383 check_narrowing (type, compound_literal);
2384 if (TREE_CODE (type) == ARRAY_TYPE
2385 && TYPE_DOMAIN (type) == NULL_TREE)
2387 cp_complete_array_type_or_error (&type, compound_literal,
2389 if (type == error_mark_node)
2390 return error_mark_node;
2392 compound_literal = digest_init (type, compound_literal, complain);
2393 if (TREE_CODE (compound_literal) == CONSTRUCTOR)
2394 TREE_HAS_CONSTRUCTOR (compound_literal) = true;
2395 /* Put static/constant array temporaries in static variables, but always
2396 represent class temporaries with TARGET_EXPR so we elide copies. */
2397 if ((!at_function_scope_p () || CP_TYPE_CONST_P (type))
2398 && TREE_CODE (type) == ARRAY_TYPE
2399 && !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
2400 && initializer_constant_valid_p (compound_literal, type))
2402 tree decl = create_temporary_var (type);
2403 DECL_INITIAL (decl) = compound_literal;
2404 TREE_STATIC (decl) = 1;
2405 if (literal_type_p (type) && CP_TYPE_CONST_NON_VOLATILE_P (type))
2407 /* 5.19 says that a constant expression can include an
2408 lvalue-rvalue conversion applied to "a glvalue of literal type
2409 that refers to a non-volatile temporary object initialized
2410 with a constant expression". Rather than try to communicate
2411 that this VAR_DECL is a temporary, just mark it constexpr. */
2412 DECL_DECLARED_CONSTEXPR_P (decl) = true;
2413 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = true;
2414 TREE_CONSTANT (decl) = true;
2416 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
2417 decl = pushdecl_top_level (decl);
2418 DECL_NAME (decl) = make_anon_name ();
2419 SET_DECL_ASSEMBLER_NAME (decl, DECL_NAME (decl));
2423 return get_target_expr_sfinae (compound_literal, complain);
2426 /* Return the declaration for the function-name variable indicated by
2430 finish_fname (tree id)
2434 decl = fname_decl (input_location, C_RID_CODE (id), id);
2435 if (processing_template_decl && current_function_decl)
2436 decl = DECL_NAME (decl);
2440 /* Finish a translation unit. */
2443 finish_translation_unit (void)
2445 /* In case there were missing closebraces,
2446 get us back to the global binding level. */
2448 while (current_namespace != global_namespace)
2451 /* Do file scope __FUNCTION__ et al. */
2452 finish_fname_decls ();
2455 /* Finish a template type parameter, specified as AGGR IDENTIFIER.
2456 Returns the parameter. */
2459 finish_template_type_parm (tree aggr, tree identifier)
2461 if (aggr != class_type_node)
2463 permerror (input_location, "template type parameters must use the keyword %<class%> or %<typename%>");
2464 aggr = class_type_node;
2467 return build_tree_list (aggr, identifier);
2470 /* Finish a template template parameter, specified as AGGR IDENTIFIER.
2471 Returns the parameter. */
2474 finish_template_template_parm (tree aggr, tree identifier)
2476 tree decl = build_decl (input_location,
2477 TYPE_DECL, identifier, NULL_TREE);
2478 tree tmpl = build_lang_decl (TEMPLATE_DECL, identifier, NULL_TREE);
2479 DECL_TEMPLATE_PARMS (tmpl) = current_template_parms;
2480 DECL_TEMPLATE_RESULT (tmpl) = decl;
2481 DECL_ARTIFICIAL (decl) = 1;
2482 end_template_decl ();
2484 gcc_assert (DECL_TEMPLATE_PARMS (tmpl));
2486 check_default_tmpl_args (decl, DECL_TEMPLATE_PARMS (tmpl),
2487 /*is_primary=*/true, /*is_partial=*/false,
2490 return finish_template_type_parm (aggr, tmpl);
2493 /* ARGUMENT is the default-argument value for a template template
2494 parameter. If ARGUMENT is invalid, issue error messages and return
2495 the ERROR_MARK_NODE. Otherwise, ARGUMENT itself is returned. */
2498 check_template_template_default_arg (tree argument)
2500 if (TREE_CODE (argument) != TEMPLATE_DECL
2501 && TREE_CODE (argument) != TEMPLATE_TEMPLATE_PARM
2502 && TREE_CODE (argument) != UNBOUND_CLASS_TEMPLATE)
2504 if (TREE_CODE (argument) == TYPE_DECL)
2505 error ("invalid use of type %qT as a default value for a template "
2506 "template-parameter", TREE_TYPE (argument));
2508 error ("invalid default argument for a template template parameter");
2509 return error_mark_node;
2515 /* Begin a class definition, as indicated by T. */
2518 begin_class_definition (tree t)
2520 if (error_operand_p (t) || error_operand_p (TYPE_MAIN_DECL (t)))
2521 return error_mark_node;
2523 if (processing_template_parmlist)
2525 error ("definition of %q#T inside template parameter list", t);
2526 return error_mark_node;
2529 /* According to the C++ ABI, decimal classes defined in ISO/IEC TR 24733
2530 are passed the same as decimal scalar types. */
2531 if (TREE_CODE (t) == RECORD_TYPE
2532 && !processing_template_decl)
2534 tree ns = TYPE_CONTEXT (t);
2535 if (ns && TREE_CODE (ns) == NAMESPACE_DECL
2536 && DECL_CONTEXT (ns) == std_node
2538 && !strcmp (IDENTIFIER_POINTER (DECL_NAME (ns)), "decimal"))
2540 const char *n = TYPE_NAME_STRING (t);
2541 if ((strcmp (n, "decimal32") == 0)
2542 || (strcmp (n, "decimal64") == 0)
2543 || (strcmp (n, "decimal128") == 0))
2544 TYPE_TRANSPARENT_AGGR (t) = 1;
2548 /* A non-implicit typename comes from code like:
2550 template <typename T> struct A {
2551 template <typename U> struct A<T>::B ...
2553 This is erroneous. */
2554 else if (TREE_CODE (t) == TYPENAME_TYPE)
2556 error ("invalid definition of qualified type %qT", t);
2557 t = error_mark_node;
2560 if (t == error_mark_node || ! MAYBE_CLASS_TYPE_P (t))
2562 t = make_class_type (RECORD_TYPE);
2563 pushtag (make_anon_name (), t, /*tag_scope=*/ts_current);
2566 if (TYPE_BEING_DEFINED (t))
2568 t = make_class_type (TREE_CODE (t));
2569 pushtag (TYPE_IDENTIFIER (t), t, /*tag_scope=*/ts_current);
2571 maybe_process_partial_specialization (t);
2573 TYPE_BEING_DEFINED (t) = 1;
2575 if (flag_pack_struct)
2578 TYPE_PACKED (t) = 1;
2579 /* Even though the type is being defined for the first time
2580 here, there might have been a forward declaration, so there
2581 might be cv-qualified variants of T. */
2582 for (v = TYPE_NEXT_VARIANT (t); v; v = TYPE_NEXT_VARIANT (v))
2583 TYPE_PACKED (v) = 1;
2585 /* Reset the interface data, at the earliest possible
2586 moment, as it might have been set via a class foo;
2588 if (! TYPE_ANONYMOUS_P (t))
2590 struct c_fileinfo *finfo = get_fileinfo (input_filename);
2591 CLASSTYPE_INTERFACE_ONLY (t) = finfo->interface_only;
2592 SET_CLASSTYPE_INTERFACE_UNKNOWN_X
2593 (t, finfo->interface_unknown);
2595 reset_specialization();
2597 /* Make a declaration for this class in its own scope. */
2598 build_self_reference ();
2603 /* Finish the member declaration given by DECL. */
2606 finish_member_declaration (tree decl)
2608 if (decl == error_mark_node || decl == NULL_TREE)
2611 if (decl == void_type_node)
2612 /* The COMPONENT was a friend, not a member, and so there's
2613 nothing for us to do. */
2616 /* We should see only one DECL at a time. */
2617 gcc_assert (DECL_CHAIN (decl) == NULL_TREE);
2619 /* Set up access control for DECL. */
2621 = (current_access_specifier == access_private_node);
2622 TREE_PROTECTED (decl)
2623 = (current_access_specifier == access_protected_node);
2624 if (TREE_CODE (decl) == TEMPLATE_DECL)
2626 TREE_PRIVATE (DECL_TEMPLATE_RESULT (decl)) = TREE_PRIVATE (decl);
2627 TREE_PROTECTED (DECL_TEMPLATE_RESULT (decl)) = TREE_PROTECTED (decl);
2630 /* Mark the DECL as a member of the current class. */
2631 DECL_CONTEXT (decl) = current_class_type;
2633 /* Check for bare parameter packs in the member variable declaration. */
2634 if (TREE_CODE (decl) == FIELD_DECL)
2636 if (check_for_bare_parameter_packs (TREE_TYPE (decl)))
2637 TREE_TYPE (decl) = error_mark_node;
2638 if (check_for_bare_parameter_packs (DECL_ATTRIBUTES (decl)))
2639 DECL_ATTRIBUTES (decl) = NULL_TREE;
2644 A C language linkage is ignored for the names of class members
2645 and the member function type of class member functions. */
2646 if (DECL_LANG_SPECIFIC (decl) && DECL_LANGUAGE (decl) == lang_c)
2647 SET_DECL_LANGUAGE (decl, lang_cplusplus);
2649 /* Put functions on the TYPE_METHODS list and everything else on the
2650 TYPE_FIELDS list. Note that these are built up in reverse order.
2651 We reverse them (to obtain declaration order) in finish_struct. */
2652 if (TREE_CODE (decl) == FUNCTION_DECL
2653 || DECL_FUNCTION_TEMPLATE_P (decl))
2655 /* We also need to add this function to the
2656 CLASSTYPE_METHOD_VEC. */
2657 if (add_method (current_class_type, decl, NULL_TREE))
2659 DECL_CHAIN (decl) = TYPE_METHODS (current_class_type);
2660 TYPE_METHODS (current_class_type) = decl;
2662 maybe_add_class_template_decl_list (current_class_type, decl,
2666 /* Enter the DECL into the scope of the class. */
2667 else if (pushdecl_class_level (decl))
2669 if (TREE_CODE (decl) == USING_DECL)
2671 /* For now, ignore class-scope USING_DECLS, so that
2672 debugging backends do not see them. */
2673 DECL_IGNORED_P (decl) = 1;
2676 /* All TYPE_DECLs go at the end of TYPE_FIELDS. Ordinary fields
2677 go at the beginning. The reason is that lookup_field_1
2678 searches the list in order, and we want a field name to
2679 override a type name so that the "struct stat hack" will
2680 work. In particular:
2682 struct S { enum E { }; int E } s;
2685 is valid. In addition, the FIELD_DECLs must be maintained in
2686 declaration order so that class layout works as expected.
2687 However, we don't need that order until class layout, so we
2688 save a little time by putting FIELD_DECLs on in reverse order
2689 here, and then reversing them in finish_struct_1. (We could
2690 also keep a pointer to the correct insertion points in the
2693 if (TREE_CODE (decl) == TYPE_DECL)
2694 TYPE_FIELDS (current_class_type)
2695 = chainon (TYPE_FIELDS (current_class_type), decl);
2698 DECL_CHAIN (decl) = TYPE_FIELDS (current_class_type);
2699 TYPE_FIELDS (current_class_type) = decl;
2702 maybe_add_class_template_decl_list (current_class_type, decl,
2707 note_decl_for_pch (decl);
2710 /* DECL has been declared while we are building a PCH file. Perform
2711 actions that we might normally undertake lazily, but which can be
2712 performed now so that they do not have to be performed in
2713 translation units which include the PCH file. */
2716 note_decl_for_pch (tree decl)
2718 gcc_assert (pch_file);
2720 /* There's a good chance that we'll have to mangle names at some
2721 point, even if only for emission in debugging information. */
2722 if ((TREE_CODE (decl) == VAR_DECL
2723 || TREE_CODE (decl) == FUNCTION_DECL)
2724 && !processing_template_decl)
2728 /* Finish processing a complete template declaration. The PARMS are
2729 the template parameters. */
2732 finish_template_decl (tree parms)
2735 end_template_decl ();
2737 end_specialization ();
2740 /* Finish processing a template-id (which names a type) of the form
2741 NAME < ARGS >. Return the TYPE_DECL for the type named by the
2742 template-id. If ENTERING_SCOPE is nonzero we are about to enter
2743 the scope of template-id indicated. */
2746 finish_template_type (tree name, tree args, int entering_scope)
2750 type = lookup_template_class (name, args,
2751 NULL_TREE, NULL_TREE, entering_scope,
2752 tf_warning_or_error | tf_user);
2753 if (type == error_mark_node)
2755 else if (CLASS_TYPE_P (type) && !alias_type_or_template_p (type))
2756 return TYPE_STUB_DECL (type);
2758 return TYPE_NAME (type);
2761 /* Finish processing a BASE_CLASS with the indicated ACCESS_SPECIFIER.
2762 Return a TREE_LIST containing the ACCESS_SPECIFIER and the
2763 BASE_CLASS, or NULL_TREE if an error occurred. The
2764 ACCESS_SPECIFIER is one of
2765 access_{default,public,protected_private}_node. For a virtual base
2766 we set TREE_TYPE. */
2769 finish_base_specifier (tree base, tree access, bool virtual_p)
2773 if (base == error_mark_node)
2775 error ("invalid base-class specification");
2778 else if (! MAYBE_CLASS_TYPE_P (base))
2780 error ("%qT is not a class type", base);
2785 if (cp_type_quals (base) != 0)
2787 /* DR 484: Can a base-specifier name a cv-qualified
2789 base = TYPE_MAIN_VARIANT (base);
2791 result = build_tree_list (access, base);
2793 TREE_TYPE (result) = integer_type_node;
2799 /* If FNS is a member function, a set of member functions, or a
2800 template-id referring to one or more member functions, return a
2801 BASELINK for FNS, incorporating the current access context.
2802 Otherwise, return FNS unchanged. */
2805 baselink_for_fns (tree fns)
2810 if (BASELINK_P (fns)
2811 || error_operand_p (fns))
2814 scope = ovl_scope (fns);
2815 if (!CLASS_TYPE_P (scope))
2818 cl = currently_open_derived_class (scope);
2821 cl = TYPE_BINFO (cl);
2822 return build_baselink (cl, cl, fns, /*optype=*/NULL_TREE);
2825 /* Returns true iff DECL is an automatic variable from a function outside
2829 outer_automatic_var_p (tree decl)
2831 return ((TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL)
2832 && DECL_FUNCTION_SCOPE_P (decl)
2833 && !TREE_STATIC (decl)
2834 && DECL_CONTEXT (decl) != current_function_decl);
2837 /* ID_EXPRESSION is a representation of parsed, but unprocessed,
2838 id-expression. (See cp_parser_id_expression for details.) SCOPE,
2839 if non-NULL, is the type or namespace used to explicitly qualify
2840 ID_EXPRESSION. DECL is the entity to which that name has been
2843 *CONSTANT_EXPRESSION_P is true if we are presently parsing a
2844 constant-expression. In that case, *NON_CONSTANT_EXPRESSION_P will
2845 be set to true if this expression isn't permitted in a
2846 constant-expression, but it is otherwise not set by this function.
2847 *ALLOW_NON_CONSTANT_EXPRESSION_P is true if we are parsing a
2848 constant-expression, but a non-constant expression is also
2851 DONE is true if this expression is a complete postfix-expression;
2852 it is false if this expression is followed by '->', '[', '(', etc.
2853 ADDRESS_P is true iff this expression is the operand of '&'.
2854 TEMPLATE_P is true iff the qualified-id was of the form
2855 "A::template B". TEMPLATE_ARG_P is true iff this qualified name
2856 appears as a template argument.
2858 If an error occurs, and it is the kind of error that might cause
2859 the parser to abort a tentative parse, *ERROR_MSG is filled in. It
2860 is the caller's responsibility to issue the message. *ERROR_MSG
2861 will be a string with static storage duration, so the caller need
2864 Return an expression for the entity, after issuing appropriate
2865 diagnostics. This function is also responsible for transforming a
2866 reference to a non-static member into a COMPONENT_REF that makes
2867 the use of "this" explicit.
2869 Upon return, *IDK will be filled in appropriately. */
2871 finish_id_expression (tree id_expression,
2875 bool integral_constant_expression_p,
2876 bool allow_non_integral_constant_expression_p,
2877 bool *non_integral_constant_expression_p,
2881 bool template_arg_p,
2882 const char **error_msg,
2883 location_t location)
2885 decl = strip_using_decl (decl);
2887 /* Initialize the output parameters. */
2888 *idk = CP_ID_KIND_NONE;
2891 if (id_expression == error_mark_node)
2892 return error_mark_node;
2893 /* If we have a template-id, then no further lookup is
2894 required. If the template-id was for a template-class, we
2895 will sometimes have a TYPE_DECL at this point. */
2896 else if (TREE_CODE (decl) == TEMPLATE_ID_EXPR
2897 || TREE_CODE (decl) == TYPE_DECL)
2899 /* Look up the name. */
2902 if (decl == error_mark_node)
2904 /* Name lookup failed. */
2907 || (!dependent_type_p (scope)
2908 && !(TREE_CODE (id_expression) == IDENTIFIER_NODE
2909 && IDENTIFIER_TYPENAME_P (id_expression)
2910 && dependent_type_p (TREE_TYPE (id_expression))))))
2912 /* If the qualifying type is non-dependent (and the name
2913 does not name a conversion operator to a dependent
2914 type), issue an error. */
2915 qualified_name_lookup_error (scope, id_expression, decl, location);
2916 return error_mark_node;
2920 /* It may be resolved via Koenig lookup. */
2921 *idk = CP_ID_KIND_UNQUALIFIED;
2922 return id_expression;
2925 decl = id_expression;
2927 /* If DECL is a variable that would be out of scope under
2928 ANSI/ISO rules, but in scope in the ARM, name lookup
2929 will succeed. Issue a diagnostic here. */
2931 decl = check_for_out_of_scope_variable (decl);
2933 /* Remember that the name was used in the definition of
2934 the current class so that we can check later to see if
2935 the meaning would have been different after the class
2936 was entirely defined. */
2937 if (!scope && decl != error_mark_node
2938 && TREE_CODE (id_expression) == IDENTIFIER_NODE)
2939 maybe_note_name_used_in_class (id_expression, decl);
2941 /* Disallow uses of local variables from containing functions, except
2942 within lambda-expressions. */
2943 if (outer_automatic_var_p (decl)
2944 /* It's not a use (3.2) if we're in an unevaluated context. */
2945 && !cp_unevaluated_operand)
2947 tree context = DECL_CONTEXT (decl);
2948 tree containing_function = current_function_decl;
2949 tree lambda_stack = NULL_TREE;
2950 tree lambda_expr = NULL_TREE;
2951 tree initializer = convert_from_reference (decl);
2953 /* Mark it as used now even if the use is ill-formed. */
2956 /* Core issue 696: "[At the July 2009 meeting] the CWG expressed
2957 support for an approach in which a reference to a local
2958 [constant] automatic variable in a nested class or lambda body
2959 would enter the expression as an rvalue, which would reduce
2960 the complexity of the problem"
2962 FIXME update for final resolution of core issue 696. */
2963 if (decl_constant_var_p (decl))
2964 return integral_constant_value (decl);
2966 /* If we are in a lambda function, we can move out until we hit
2968 2. a non-lambda function, or
2969 3. a non-default capturing lambda function. */
2970 while (context != containing_function
2971 && LAMBDA_FUNCTION_P (containing_function))
2973 lambda_expr = CLASSTYPE_LAMBDA_EXPR
2974 (DECL_CONTEXT (containing_function));
2976 if (LAMBDA_EXPR_DEFAULT_CAPTURE_MODE (lambda_expr)
2980 lambda_stack = tree_cons (NULL_TREE,
2985 = decl_function_context (containing_function);
2988 if (context == containing_function)
2990 decl = add_default_capture (lambda_stack,
2991 /*id=*/DECL_NAME (decl),
2994 else if (lambda_expr)
2996 error ("%qD is not captured", decl);
2997 return error_mark_node;
3001 error (TREE_CODE (decl) == VAR_DECL
3002 ? G_("use of %<auto%> variable from containing function")
3003 : G_("use of parameter from containing function"));
3004 error (" %q+#D declared here", decl);
3005 return error_mark_node;
3009 /* Also disallow uses of function parameters outside the function
3010 body, except inside an unevaluated context (i.e. decltype). */
3011 if (TREE_CODE (decl) == PARM_DECL
3012 && DECL_CONTEXT (decl) == NULL_TREE
3013 && !cp_unevaluated_operand)
3015 error ("use of parameter %qD outside function body", decl);
3016 return error_mark_node;
3020 /* If we didn't find anything, or what we found was a type,
3021 then this wasn't really an id-expression. */
3022 if (TREE_CODE (decl) == TEMPLATE_DECL
3023 && !DECL_FUNCTION_TEMPLATE_P (decl))
3025 *error_msg = "missing template arguments";
3026 return error_mark_node;
3028 else if (TREE_CODE (decl) == TYPE_DECL
3029 || TREE_CODE (decl) == NAMESPACE_DECL)
3031 *error_msg = "expected primary-expression";
3032 return error_mark_node;
3035 /* If the name resolved to a template parameter, there is no
3036 need to look it up again later. */
3037 if ((TREE_CODE (decl) == CONST_DECL && DECL_TEMPLATE_PARM_P (decl))
3038 || TREE_CODE (decl) == TEMPLATE_PARM_INDEX)
3042 *idk = CP_ID_KIND_NONE;
3043 if (TREE_CODE (decl) == TEMPLATE_PARM_INDEX)
3044 decl = TEMPLATE_PARM_DECL (decl);
3045 r = convert_from_reference (DECL_INITIAL (decl));
3047 if (integral_constant_expression_p
3048 && !dependent_type_p (TREE_TYPE (decl))
3049 && !(INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (r))))
3051 if (!allow_non_integral_constant_expression_p)
3052 error ("template parameter %qD of type %qT is not allowed in "
3053 "an integral constant expression because it is not of "
3054 "integral or enumeration type", decl, TREE_TYPE (decl));
3055 *non_integral_constant_expression_p = true;
3059 /* Similarly, we resolve enumeration constants to their
3060 underlying values. */
3061 else if (TREE_CODE (decl) == CONST_DECL)
3063 *idk = CP_ID_KIND_NONE;
3064 if (!processing_template_decl)
3066 used_types_insert (TREE_TYPE (decl));
3067 return DECL_INITIAL (decl);
3075 /* If the declaration was explicitly qualified indicate
3076 that. The semantics of `A::f(3)' are different than
3077 `f(3)' if `f' is virtual. */
3079 ? CP_ID_KIND_QUALIFIED
3080 : (TREE_CODE (decl) == TEMPLATE_ID_EXPR
3081 ? CP_ID_KIND_TEMPLATE_ID
3082 : CP_ID_KIND_UNQUALIFIED));
3087 An id-expression is type-dependent if it contains an
3088 identifier that was declared with a dependent type.
3090 The standard is not very specific about an id-expression that
3091 names a set of overloaded functions. What if some of them
3092 have dependent types and some of them do not? Presumably,
3093 such a name should be treated as a dependent name. */
3094 /* Assume the name is not dependent. */
3095 dependent_p = false;
3096 if (!processing_template_decl)
3097 /* No names are dependent outside a template. */
3099 /* A template-id where the name of the template was not resolved
3100 is definitely dependent. */
3101 else if (TREE_CODE (decl) == TEMPLATE_ID_EXPR
3102 && (TREE_CODE (TREE_OPERAND (decl, 0))
3103 == IDENTIFIER_NODE))
3105 /* For anything except an overloaded function, just check its
3107 else if (!is_overloaded_fn (decl))
3109 = dependent_type_p (TREE_TYPE (decl));
3110 /* For a set of overloaded functions, check each of the
3116 if (BASELINK_P (fns))
3117 fns = BASELINK_FUNCTIONS (fns);
3119 /* For a template-id, check to see if the template
3120 arguments are dependent. */
3121 if (TREE_CODE (fns) == TEMPLATE_ID_EXPR)
3123 tree args = TREE_OPERAND (fns, 1);
3124 dependent_p = any_dependent_template_arguments_p (args);
3125 /* The functions are those referred to by the
3127 fns = TREE_OPERAND (fns, 0);
3130 /* If there are no dependent template arguments, go through
3131 the overloaded functions. */
3132 while (fns && !dependent_p)
3134 tree fn = OVL_CURRENT (fns);
3136 /* Member functions of dependent classes are
3138 if (TREE_CODE (fn) == FUNCTION_DECL
3139 && type_dependent_expression_p (fn))
3141 else if (TREE_CODE (fn) == TEMPLATE_DECL
3142 && dependent_template_p (fn))
3145 fns = OVL_NEXT (fns);
3149 /* If the name was dependent on a template parameter, we will
3150 resolve the name at instantiation time. */
3153 /* Create a SCOPE_REF for qualified names, if the scope is
3159 if (address_p && done)
3160 decl = finish_qualified_id_expr (scope, decl,
3166 tree type = NULL_TREE;
3167 if (DECL_P (decl) && !dependent_scope_p (scope))
3168 type = TREE_TYPE (decl);
3169 decl = build_qualified_name (type,
3175 if (TREE_TYPE (decl))
3176 decl = convert_from_reference (decl);
3179 /* A TEMPLATE_ID already contains all the information we
3181 if (TREE_CODE (id_expression) == TEMPLATE_ID_EXPR)
3182 return id_expression;
3183 *idk = CP_ID_KIND_UNQUALIFIED_DEPENDENT;
3184 /* If we found a variable, then name lookup during the
3185 instantiation will always resolve to the same VAR_DECL
3186 (or an instantiation thereof). */
3187 if (TREE_CODE (decl) == VAR_DECL
3188 || TREE_CODE (decl) == PARM_DECL)
3191 return convert_from_reference (decl);
3193 /* The same is true for FIELD_DECL, but we also need to
3194 make sure that the syntax is correct. */
3195 else if (TREE_CODE (decl) == FIELD_DECL)
3197 /* Since SCOPE is NULL here, this is an unqualified name.
3198 Access checking has been performed during name lookup
3199 already. Turn off checking to avoid duplicate errors. */
3200 push_deferring_access_checks (dk_no_check);
3201 decl = finish_non_static_data_member
3203 /*qualifying_scope=*/NULL_TREE);
3204 pop_deferring_access_checks ();
3207 return id_expression;
3210 if (TREE_CODE (decl) == NAMESPACE_DECL)
3212 error ("use of namespace %qD as expression", decl);
3213 return error_mark_node;
3215 else if (DECL_CLASS_TEMPLATE_P (decl))
3217 error ("use of class template %qT as expression", decl);
3218 return error_mark_node;
3220 else if (TREE_CODE (decl) == TREE_LIST)
3222 /* Ambiguous reference to base members. */
3223 error ("request for member %qD is ambiguous in "
3224 "multiple inheritance lattice", id_expression);
3225 print_candidates (decl);
3226 return error_mark_node;
3229 /* Mark variable-like entities as used. Functions are similarly
3230 marked either below or after overload resolution. */
3231 if (TREE_CODE (decl) == VAR_DECL
3232 || TREE_CODE (decl) == PARM_DECL
3233 || TREE_CODE (decl) == RESULT_DECL)
3236 /* Only certain kinds of names are allowed in constant
3237 expression. Enumerators and template parameters have already
3238 been handled above. */
3239 if (! error_operand_p (decl)
3240 && integral_constant_expression_p
3241 && ! decl_constant_var_p (decl)
3242 && ! builtin_valid_in_constant_expr_p (decl))
3244 if (!allow_non_integral_constant_expression_p)
3246 error ("%qD cannot appear in a constant-expression", decl);
3247 return error_mark_node;
3249 *non_integral_constant_expression_p = true;
3254 decl = (adjust_result_of_qualified_name_lookup
3255 (decl, scope, current_nonlambda_class_type()));
3257 if (TREE_CODE (decl) == FUNCTION_DECL)
3260 if (TREE_CODE (decl) == FIELD_DECL || BASELINK_P (decl))
3261 decl = finish_qualified_id_expr (scope,
3269 tree r = convert_from_reference (decl);
3271 /* In a template, return a SCOPE_REF for most qualified-ids
3272 so that we can check access at instantiation time. But if
3273 we're looking at a member of the current instantiation, we
3274 know we have access and building up the SCOPE_REF confuses
3275 non-type template argument handling. */
3276 if (processing_template_decl && TYPE_P (scope)
3277 && !currently_open_class (scope))
3278 r = build_qualified_name (TREE_TYPE (r),
3284 else if (TREE_CODE (decl) == FIELD_DECL)
3286 /* Since SCOPE is NULL here, this is an unqualified name.
3287 Access checking has been performed during name lookup
3288 already. Turn off checking to avoid duplicate errors. */
3289 push_deferring_access_checks (dk_no_check);
3290 decl = finish_non_static_data_member (decl, NULL_TREE,
3291 /*qualifying_scope=*/NULL_TREE);
3292 pop_deferring_access_checks ();
3294 else if (is_overloaded_fn (decl))
3298 first_fn = get_first_fn (decl);
3299 if (TREE_CODE (first_fn) == TEMPLATE_DECL)
3300 first_fn = DECL_TEMPLATE_RESULT (first_fn);
3302 if (!really_overloaded_fn (decl)
3303 && !mark_used (first_fn))
3304 return error_mark_node;
3307 && TREE_CODE (first_fn) == FUNCTION_DECL
3308 && DECL_FUNCTION_MEMBER_P (first_fn)
3309 && !shared_member_p (decl))
3311 /* A set of member functions. */
3312 decl = maybe_dummy_object (DECL_CONTEXT (first_fn), 0);
3313 return finish_class_member_access_expr (decl, id_expression,
3314 /*template_p=*/false,
3315 tf_warning_or_error);
3318 decl = baselink_for_fns (decl);
3322 if (DECL_P (decl) && DECL_NONLOCAL (decl)
3323 && DECL_CLASS_SCOPE_P (decl))
3325 tree context = context_for_name_lookup (decl);
3326 if (context != current_class_type)
3328 tree path = currently_open_derived_class (context);
3329 perform_or_defer_access_check (TYPE_BINFO (path),
3334 decl = convert_from_reference (decl);
3338 if (TREE_DEPRECATED (decl))
3339 warn_deprecated_use (decl, NULL_TREE);
3344 /* Implement the __typeof keyword: Return the type of EXPR, suitable for
3345 use as a type-specifier. */
3348 finish_typeof (tree expr)
3352 if (type_dependent_expression_p (expr))
3354 type = cxx_make_type (TYPEOF_TYPE);
3355 TYPEOF_TYPE_EXPR (type) = expr;
3356 SET_TYPE_STRUCTURAL_EQUALITY (type);
3361 expr = mark_type_use (expr);
3363 type = unlowered_expr_type (expr);
3365 if (!type || type == unknown_type_node)
3367 error ("type of %qE is unknown", expr);
3368 return error_mark_node;
3374 /* Implement the __underlying_type keyword: Return the underlying
3375 type of TYPE, suitable for use as a type-specifier. */
3378 finish_underlying_type (tree type)
3380 tree underlying_type;
3382 if (processing_template_decl)
3384 underlying_type = cxx_make_type (UNDERLYING_TYPE);
3385 UNDERLYING_TYPE_TYPE (underlying_type) = type;
3386 SET_TYPE_STRUCTURAL_EQUALITY (underlying_type);
3388 return underlying_type;
3391 complete_type (type);
3393 if (TREE_CODE (type) != ENUMERAL_TYPE)
3395 error ("%qT is not an enumeration type", type);
3396 return error_mark_node;
3399 underlying_type = ENUM_UNDERLYING_TYPE (type);
3401 /* Fixup necessary in this case because ENUM_UNDERLYING_TYPE
3402 includes TYPE_MIN_VALUE and TYPE_MAX_VALUE information.
3403 See finish_enum_value_list for details. */
3404 if (!ENUM_FIXED_UNDERLYING_TYPE_P (type))
3406 = c_common_type_for_mode (TYPE_MODE (underlying_type),
3407 TYPE_UNSIGNED (underlying_type));
3409 return underlying_type;
3412 /* Implement the __direct_bases keyword: Return the direct base classes
3416 calculate_direct_bases (tree type)
3418 VEC(tree, gc) *vector = make_tree_vector();
3419 tree bases_vec = NULL_TREE;
3420 VEC(tree, none) *base_binfos;
3424 complete_type (type);
3426 if (!NON_UNION_CLASS_TYPE_P (type))
3427 return make_tree_vec (0);
3429 base_binfos = BINFO_BASE_BINFOS (TYPE_BINFO (type));
3431 /* Virtual bases are initialized first */
3432 for (i = 0; VEC_iterate (tree, base_binfos, i, binfo); i++)
3434 if (BINFO_VIRTUAL_P (binfo))
3436 VEC_safe_push (tree, gc, vector, binfo);
3440 /* Now non-virtuals */
3441 for (i = 0; VEC_iterate (tree, base_binfos, i, binfo); i++)
3443 if (!BINFO_VIRTUAL_P (binfo))
3445 VEC_safe_push (tree, gc, vector, binfo);
3450 bases_vec = make_tree_vec (VEC_length (tree, vector));
3452 for (i = 0; i < VEC_length (tree, vector); ++i)
3454 TREE_VEC_ELT (bases_vec, i) = BINFO_TYPE (VEC_index (tree, vector, i));
3459 /* Implement the __bases keyword: Return the base classes
3462 /* Find morally non-virtual base classes by walking binfo hierarchy */
3463 /* Virtual base classes are handled separately in finish_bases */
3466 dfs_calculate_bases_pre (tree binfo, ATTRIBUTE_UNUSED void *data_)
3468 /* Don't walk bases of virtual bases */
3469 return BINFO_VIRTUAL_P (binfo) ? dfs_skip_bases : NULL_TREE;
3473 dfs_calculate_bases_post (tree binfo, void *data_)
3475 VEC(tree, gc) **data = (VEC(tree, gc) **) data_;
3476 if (!BINFO_VIRTUAL_P (binfo))
3478 VEC_safe_push (tree, gc, *data, BINFO_TYPE (binfo));
3483 /* Calculates the morally non-virtual base classes of a class */
3484 static VEC(tree, gc) *
3485 calculate_bases_helper (tree type)
3487 VEC(tree, gc) *vector = make_tree_vector();
3489 /* Now add non-virtual base classes in order of construction */
3490 dfs_walk_all (TYPE_BINFO (type),
3491 dfs_calculate_bases_pre, dfs_calculate_bases_post, &vector);
3496 calculate_bases (tree type)
3498 VEC(tree, gc) *vector = make_tree_vector();
3499 tree bases_vec = NULL_TREE;
3501 VEC(tree, gc) *vbases;
3502 VEC(tree, gc) *nonvbases;
3505 complete_type (type);
3507 if (!NON_UNION_CLASS_TYPE_P (type))
3508 return make_tree_vec (0);
3510 /* First go through virtual base classes */
3511 for (vbases = CLASSTYPE_VBASECLASSES (type), i = 0;
3512 VEC_iterate (tree, vbases, i, binfo); i++)
3514 VEC(tree, gc) *vbase_bases = calculate_bases_helper (BINFO_TYPE (binfo));
3515 VEC_safe_splice (tree, gc, vector, vbase_bases);
3516 release_tree_vector (vbase_bases);
3519 /* Now for the non-virtual bases */
3520 nonvbases = calculate_bases_helper (type);
3521 VEC_safe_splice (tree, gc, vector, nonvbases);
3522 release_tree_vector (nonvbases);
3524 /* Last element is entire class, so don't copy */
3525 bases_vec = make_tree_vec (VEC_length (tree, vector) - 1);
3527 for (i = 0; i < VEC_length (tree, vector) - 1; ++i)
3529 TREE_VEC_ELT (bases_vec, i) = VEC_index (tree, vector, i);
3531 release_tree_vector (vector);
3536 finish_bases (tree type, bool direct)
3538 tree bases = NULL_TREE;
3540 if (!processing_template_decl)
3542 /* Parameter packs can only be used in templates */
3543 error ("Parameter pack __bases only valid in template declaration");
3544 return error_mark_node;
3547 bases = cxx_make_type (BASES);
3548 BASES_TYPE (bases) = type;
3549 BASES_DIRECT (bases) = direct;
3550 SET_TYPE_STRUCTURAL_EQUALITY (bases);
3555 /* Perform C++-specific checks for __builtin_offsetof before calling
3559 finish_offsetof (tree expr)
3561 if (TREE_CODE (expr) == PSEUDO_DTOR_EXPR)
3563 error ("cannot apply %<offsetof%> to destructor %<~%T%>",
3564 TREE_OPERAND (expr, 2));
3565 return error_mark_node;
3567 if (TREE_CODE (TREE_TYPE (expr)) == FUNCTION_TYPE
3568 || TREE_CODE (TREE_TYPE (expr)) == METHOD_TYPE
3569 || TREE_TYPE (expr) == unknown_type_node)
3571 if (TREE_CODE (expr) == COMPONENT_REF
3572 || TREE_CODE (expr) == COMPOUND_EXPR)
3573 expr = TREE_OPERAND (expr, 1);
3574 error ("cannot apply %<offsetof%> to member function %qD", expr);
3575 return error_mark_node;
3577 if (REFERENCE_REF_P (expr))
3578 expr = TREE_OPERAND (expr, 0);
3579 if (TREE_CODE (expr) == COMPONENT_REF)
3581 tree object = TREE_OPERAND (expr, 0);
3582 if (!complete_type_or_else (TREE_TYPE (object), object))
3583 return error_mark_node;
3585 return fold_offsetof (expr);
3588 /* Replace the AGGR_INIT_EXPR at *TP with an equivalent CALL_EXPR. This
3589 function is broken out from the above for the benefit of the tree-ssa
3593 simplify_aggr_init_expr (tree *tp)
3595 tree aggr_init_expr = *tp;
3597 /* Form an appropriate CALL_EXPR. */
3598 tree fn = AGGR_INIT_EXPR_FN (aggr_init_expr);
3599 tree slot = AGGR_INIT_EXPR_SLOT (aggr_init_expr);
3600 tree type = TREE_TYPE (slot);
3603 enum style_t { ctor, arg, pcc } style;
3605 if (AGGR_INIT_VIA_CTOR_P (aggr_init_expr))
3607 #ifdef PCC_STATIC_STRUCT_RETURN
3613 gcc_assert (TREE_ADDRESSABLE (type));
3617 call_expr = build_call_array_loc (input_location,
3618 TREE_TYPE (TREE_TYPE (TREE_TYPE (fn))),
3620 aggr_init_expr_nargs (aggr_init_expr),
3621 AGGR_INIT_EXPR_ARGP (aggr_init_expr));
3622 TREE_NOTHROW (call_expr) = TREE_NOTHROW (aggr_init_expr);
3626 /* Replace the first argument to the ctor with the address of the
3628 cxx_mark_addressable (slot);
3629 CALL_EXPR_ARG (call_expr, 0) =
3630 build1 (ADDR_EXPR, build_pointer_type (type), slot);
3632 else if (style == arg)
3634 /* Just mark it addressable here, and leave the rest to
3635 expand_call{,_inline}. */
3636 cxx_mark_addressable (slot);
3637 CALL_EXPR_RETURN_SLOT_OPT (call_expr) = true;
3638 call_expr = build2 (INIT_EXPR, TREE_TYPE (call_expr), slot, call_expr);
3640 else if (style == pcc)
3642 /* If we're using the non-reentrant PCC calling convention, then we
3643 need to copy the returned value out of the static buffer into the
3645 push_deferring_access_checks (dk_no_check);
3646 call_expr = build_aggr_init (slot, call_expr,
3647 DIRECT_BIND | LOOKUP_ONLYCONVERTING,
3648 tf_warning_or_error);
3649 pop_deferring_access_checks ();
3650 call_expr = build2 (COMPOUND_EXPR, TREE_TYPE (slot), call_expr, slot);
3653 if (AGGR_INIT_ZERO_FIRST (aggr_init_expr))
3655 tree init = build_zero_init (type, NULL_TREE,
3656 /*static_storage_p=*/false);
3657 init = build2 (INIT_EXPR, void_type_node, slot, init);
3658 call_expr = build2 (COMPOUND_EXPR, TREE_TYPE (call_expr),
3665 /* Emit all thunks to FN that should be emitted when FN is emitted. */
3668 emit_associated_thunks (tree fn)
3670 /* When we use vcall offsets, we emit thunks with the virtual
3671 functions to which they thunk. The whole point of vcall offsets
3672 is so that you can know statically the entire set of thunks that
3673 will ever be needed for a given virtual function, thereby
3674 enabling you to output all the thunks with the function itself. */
3675 if (DECL_VIRTUAL_P (fn)
3676 /* Do not emit thunks for extern template instantiations. */
3677 && ! DECL_REALLY_EXTERN (fn))
3681 for (thunk = DECL_THUNKS (fn); thunk; thunk = DECL_CHAIN (thunk))
3683 if (!THUNK_ALIAS (thunk))
3685 use_thunk (thunk, /*emit_p=*/1);
3686 if (DECL_RESULT_THUNK_P (thunk))
3690 for (probe = DECL_THUNKS (thunk);
3691 probe; probe = DECL_CHAIN (probe))
3692 use_thunk (probe, /*emit_p=*/1);
3696 gcc_assert (!DECL_THUNKS (thunk));
3701 /* Returns true iff FUN is an instantiation of a constexpr function
3705 is_instantiation_of_constexpr (tree fun)
3707 return (DECL_TEMPLOID_INSTANTIATION (fun)
3708 && DECL_DECLARED_CONSTEXPR_P (DECL_TEMPLATE_RESULT
3709 (DECL_TI_TEMPLATE (fun))));
3712 /* Generate RTL for FN. */
3715 expand_or_defer_fn_1 (tree fn)
3717 /* When the parser calls us after finishing the body of a template
3718 function, we don't really want to expand the body. */
3719 if (processing_template_decl)
3721 /* Normally, collection only occurs in rest_of_compilation. So,
3722 if we don't collect here, we never collect junk generated
3723 during the processing of templates until we hit a
3724 non-template function. It's not safe to do this inside a
3725 nested class, though, as the parser may have local state that
3726 is not a GC root. */
3727 if (!function_depth)
3732 gcc_assert (DECL_SAVED_TREE (fn));
3734 /* If this is a constructor or destructor body, we have to clone
3736 if (maybe_clone_body (fn))
3738 /* We don't want to process FN again, so pretend we've written
3739 it out, even though we haven't. */
3740 TREE_ASM_WRITTEN (fn) = 1;
3741 /* If this is an instantiation of a constexpr function, keep
3742 DECL_SAVED_TREE for explain_invalid_constexpr_fn. */
3743 if (!is_instantiation_of_constexpr (fn))
3744 DECL_SAVED_TREE (fn) = NULL_TREE;
3748 /* We make a decision about linkage for these functions at the end
3749 of the compilation. Until that point, we do not want the back
3750 end to output them -- but we do want it to see the bodies of
3751 these functions so that it can inline them as appropriate. */
3752 if (DECL_DECLARED_INLINE_P (fn) || DECL_IMPLICIT_INSTANTIATION (fn))
3754 if (DECL_INTERFACE_KNOWN (fn))
3755 /* We've already made a decision as to how this function will
3759 DECL_EXTERNAL (fn) = 1;
3760 DECL_NOT_REALLY_EXTERN (fn) = 1;
3761 note_vague_linkage_fn (fn);
3762 /* A non-template inline function with external linkage will
3763 always be COMDAT. As we must eventually determine the
3764 linkage of all functions, and as that causes writes to
3765 the data mapped in from the PCH file, it's advantageous
3766 to mark the functions at this point. */
3767 if (!DECL_IMPLICIT_INSTANTIATION (fn))
3769 /* This function must have external linkage, as
3770 otherwise DECL_INTERFACE_KNOWN would have been
3772 gcc_assert (TREE_PUBLIC (fn));
3773 comdat_linkage (fn);
3774 DECL_INTERFACE_KNOWN (fn) = 1;
3778 import_export_decl (fn);
3780 /* If the user wants us to keep all inline functions, then mark
3781 this function as needed so that finish_file will make sure to
3782 output it later. Similarly, all dllexport'd functions must
3783 be emitted; there may be callers in other DLLs. */
3784 if ((flag_keep_inline_functions
3785 && DECL_DECLARED_INLINE_P (fn)
3786 && !DECL_REALLY_EXTERN (fn))
3787 || (flag_keep_inline_dllexport
3788 && lookup_attribute ("dllexport", DECL_ATTRIBUTES (fn))))
3791 DECL_EXTERNAL (fn) = 0;
3795 /* There's no reason to do any of the work here if we're only doing
3796 semantic analysis; this code just generates RTL. */
3797 if (flag_syntax_only)
3804 expand_or_defer_fn (tree fn)
3806 if (expand_or_defer_fn_1 (fn))
3810 /* Expand or defer, at the whim of the compilation unit manager. */
3811 cgraph_finalize_function (fn, function_depth > 1);
3812 emit_associated_thunks (fn);
3825 /* Helper function for walk_tree, used by finalize_nrv below. */
3828 finalize_nrv_r (tree* tp, int* walk_subtrees, void* data)
3830 struct nrv_data *dp = (struct nrv_data *)data;
3833 /* No need to walk into types. There wouldn't be any need to walk into
3834 non-statements, except that we have to consider STMT_EXPRs. */
3837 /* Change all returns to just refer to the RESULT_DECL; this is a nop,
3838 but differs from using NULL_TREE in that it indicates that we care
3839 about the value of the RESULT_DECL. */
3840 else if (TREE_CODE (*tp) == RETURN_EXPR)
3841 TREE_OPERAND (*tp, 0) = dp->result;
3842 /* Change all cleanups for the NRV to only run when an exception is
3844 else if (TREE_CODE (*tp) == CLEANUP_STMT
3845 && CLEANUP_DECL (*tp) == dp->var)
3846 CLEANUP_EH_ONLY (*tp) = 1;
3847 /* Replace the DECL_EXPR for the NRV with an initialization of the
3848 RESULT_DECL, if needed. */
3849 else if (TREE_CODE (*tp) == DECL_EXPR
3850 && DECL_EXPR_DECL (*tp) == dp->var)
3853 if (DECL_INITIAL (dp->var)
3854 && DECL_INITIAL (dp->var) != error_mark_node)
3855 init = build2 (INIT_EXPR, void_type_node, dp->result,
3856 DECL_INITIAL (dp->var));
3858 init = build_empty_stmt (EXPR_LOCATION (*tp));
3859 DECL_INITIAL (dp->var) = NULL_TREE;
3860 SET_EXPR_LOCATION (init, EXPR_LOCATION (*tp));
3863 /* And replace all uses of the NRV with the RESULT_DECL. */
3864 else if (*tp == dp->var)
3867 /* Avoid walking into the same tree more than once. Unfortunately, we
3868 can't just use walk_tree_without duplicates because it would only call
3869 us for the first occurrence of dp->var in the function body. */
3870 slot = htab_find_slot (dp->visited, *tp, INSERT);
3876 /* Keep iterating. */
3880 /* Called from finish_function to implement the named return value
3881 optimization by overriding all the RETURN_EXPRs and pertinent
3882 CLEANUP_STMTs and replacing all occurrences of VAR with RESULT, the
3883 RESULT_DECL for the function. */
3886 finalize_nrv (tree *tp, tree var, tree result)
3888 struct nrv_data data;
3890 /* Copy name from VAR to RESULT. */
3891 DECL_NAME (result) = DECL_NAME (var);
3892 /* Don't forget that we take its address. */
3893 TREE_ADDRESSABLE (result) = TREE_ADDRESSABLE (var);
3894 /* Finally set DECL_VALUE_EXPR to avoid assigning
3895 a stack slot at -O0 for the original var and debug info
3896 uses RESULT location for VAR. */
3897 SET_DECL_VALUE_EXPR (var, result);
3898 DECL_HAS_VALUE_EXPR_P (var) = 1;
3901 data.result = result;
3902 data.visited = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
3903 cp_walk_tree (tp, finalize_nrv_r, &data, 0);
3904 htab_delete (data.visited);
3907 /* Create CP_OMP_CLAUSE_INFO for clause C. Returns true if it is invalid. */
3910 cxx_omp_create_clause_info (tree c, tree type, bool need_default_ctor,
3911 bool need_copy_ctor, bool need_copy_assignment)
3913 int save_errorcount = errorcount;
3916 /* Always allocate 3 elements for simplicity. These are the
3917 function decls for the ctor, dtor, and assignment op.
3918 This layout is known to the three lang hooks,
3919 cxx_omp_clause_default_init, cxx_omp_clause_copy_init,
3920 and cxx_omp_clause_assign_op. */
3921 info = make_tree_vec (3);
3922 CP_OMP_CLAUSE_INFO (c) = info;
3924 if (need_default_ctor || need_copy_ctor)
3926 if (need_default_ctor)
3927 t = get_default_ctor (type);
3929 t = get_copy_ctor (type, tf_warning_or_error);
3931 if (t && !trivial_fn_p (t))
3932 TREE_VEC_ELT (info, 0) = t;
3935 if ((need_default_ctor || need_copy_ctor)
3936 && TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
3937 TREE_VEC_ELT (info, 1) = get_dtor (type, tf_warning_or_error);
3939 if (need_copy_assignment)
3941 t = get_copy_assign (type);
3943 if (t && !trivial_fn_p (t))
3944 TREE_VEC_ELT (info, 2) = t;
3947 return errorcount != save_errorcount;
3950 /* For all elements of CLAUSES, validate them vs OpenMP constraints.
3951 Remove any elements from the list that are invalid. */
3954 finish_omp_clauses (tree clauses)
3956 bitmap_head generic_head, firstprivate_head, lastprivate_head;
3957 tree c, t, *pc = &clauses;
3960 bitmap_obstack_initialize (NULL);
3961 bitmap_initialize (&generic_head, &bitmap_default_obstack);
3962 bitmap_initialize (&firstprivate_head, &bitmap_default_obstack);
3963 bitmap_initialize (&lastprivate_head, &bitmap_default_obstack);
3965 for (pc = &clauses, c = clauses; c ; c = *pc)
3967 bool remove = false;
3969 switch (OMP_CLAUSE_CODE (c))
3971 case OMP_CLAUSE_SHARED:
3973 goto check_dup_generic;
3974 case OMP_CLAUSE_PRIVATE:
3976 goto check_dup_generic;
3977 case OMP_CLAUSE_REDUCTION:
3979 goto check_dup_generic;
3980 case OMP_CLAUSE_COPYPRIVATE:
3981 name = "copyprivate";
3982 goto check_dup_generic;
3983 case OMP_CLAUSE_COPYIN:
3985 goto check_dup_generic;
3987 t = OMP_CLAUSE_DECL (c);
3988 if (TREE_CODE (t) != VAR_DECL && TREE_CODE (t) != PARM_DECL)
3990 if (processing_template_decl)
3993 error ("%qD is not a variable in clause %qs", t, name);
3995 error ("%qE is not a variable in clause %qs", t, name);
3998 else if (bitmap_bit_p (&generic_head, DECL_UID (t))
3999 || bitmap_bit_p (&firstprivate_head, DECL_UID (t))
4000 || bitmap_bit_p (&lastprivate_head, DECL_UID (t)))
4002 error ("%qD appears more than once in data clauses", t);
4006 bitmap_set_bit (&generic_head, DECL_UID (t));
4009 case OMP_CLAUSE_FIRSTPRIVATE:
4010 t = OMP_CLAUSE_DECL (c);
4011 if (TREE_CODE (t) != VAR_DECL && TREE_CODE (t) != PARM_DECL)
4013 if (processing_template_decl)
4016 error ("%qD is not a variable in clause %<firstprivate%>", t);
4018 error ("%qE is not a variable in clause %<firstprivate%>", t);
4021 else if (bitmap_bit_p (&generic_head, DECL_UID (t))
4022 || bitmap_bit_p (&firstprivate_head, DECL_UID (t)))
4024 error ("%qD appears more than once in data clauses", t);
4028 bitmap_set_bit (&firstprivate_head, DECL_UID (t));
4031 case OMP_CLAUSE_LASTPRIVATE:
4032 t = OMP_CLAUSE_DECL (c);
4033 if (TREE_CODE (t) != VAR_DECL && TREE_CODE (t) != PARM_DECL)
4035 if (processing_template_decl)
4038 error ("%qD is not a variable in clause %<lastprivate%>", t);
4040 error ("%qE is not a variable in clause %<lastprivate%>", t);
4043 else if (bitmap_bit_p (&generic_head, DECL_UID (t))
4044 || bitmap_bit_p (&lastprivate_head, DECL_UID (t)))
4046 error ("%qD appears more than once in data clauses", t);
4050 bitmap_set_bit (&lastprivate_head, DECL_UID (t));
4054 t = OMP_CLAUSE_IF_EXPR (c);
4055 t = maybe_convert_cond (t);
4056 if (t == error_mark_node)
4058 else if (!processing_template_decl)
4059 t = fold_build_cleanup_point_expr (TREE_TYPE (t), t);
4060 OMP_CLAUSE_IF_EXPR (c) = t;
4063 case OMP_CLAUSE_FINAL:
4064 t = OMP_CLAUSE_FINAL_EXPR (c);
4065 t = maybe_convert_cond (t);
4066 if (t == error_mark_node)
4068 else if (!processing_template_decl)
4069 t = fold_build_cleanup_point_expr (TREE_TYPE (t), t);
4070 OMP_CLAUSE_FINAL_EXPR (c) = t;
4073 case OMP_CLAUSE_NUM_THREADS:
4074 t = OMP_CLAUSE_NUM_THREADS_EXPR (c);
4075 if (t == error_mark_node)
4077 else if (!type_dependent_expression_p (t)
4078 && !INTEGRAL_TYPE_P (TREE_TYPE (t)))
4080 error ("num_threads expression must be integral");
4085 t = mark_rvalue_use (t);
4086 if (!processing_template_decl)
4087 t = fold_build_cleanup_point_expr (TREE_TYPE (t), t);
4088 OMP_CLAUSE_NUM_THREADS_EXPR (c) = t;
4092 case OMP_CLAUSE_SCHEDULE:
4093 t = OMP_CLAUSE_SCHEDULE_CHUNK_EXPR (c);
4096 else if (t == error_mark_node)
4098 else if (!type_dependent_expression_p (t)
4099 && !INTEGRAL_TYPE_P (TREE_TYPE (t)))
4101 error ("schedule chunk size expression must be integral");
4106 t = mark_rvalue_use (t);
4107 if (!processing_template_decl)
4108 t = fold_build_cleanup_point_expr (TREE_TYPE (t), t);
4109 OMP_CLAUSE_SCHEDULE_CHUNK_EXPR (c) = t;
4113 case OMP_CLAUSE_NOWAIT:
4114 case OMP_CLAUSE_ORDERED:
4115 case OMP_CLAUSE_DEFAULT:
4116 case OMP_CLAUSE_UNTIED:
4117 case OMP_CLAUSE_COLLAPSE:
4118 case OMP_CLAUSE_MERGEABLE:
4126 *pc = OMP_CLAUSE_CHAIN (c);
4128 pc = &OMP_CLAUSE_CHAIN (c);
4131 for (pc = &clauses, c = clauses; c ; c = *pc)
4133 enum omp_clause_code c_kind = OMP_CLAUSE_CODE (c);
4134 bool remove = false;
4135 bool need_complete_non_reference = false;
4136 bool need_default_ctor = false;
4137 bool need_copy_ctor = false;
4138 bool need_copy_assignment = false;
4139 bool need_implicitly_determined = false;
4140 tree type, inner_type;
4144 case OMP_CLAUSE_SHARED:
4146 need_implicitly_determined = true;
4148 case OMP_CLAUSE_PRIVATE:
4150 need_complete_non_reference = true;
4151 need_default_ctor = true;
4152 need_implicitly_determined = true;
4154 case OMP_CLAUSE_FIRSTPRIVATE:
4155 name = "firstprivate";
4156 need_complete_non_reference = true;
4157 need_copy_ctor = true;
4158 need_implicitly_determined = true;
4160 case OMP_CLAUSE_LASTPRIVATE:
4161 name = "lastprivate";
4162 need_complete_non_reference = true;
4163 need_copy_assignment = true;
4164 need_implicitly_determined = true;
4166 case OMP_CLAUSE_REDUCTION:
4168 need_implicitly_determined = true;
4170 case OMP_CLAUSE_COPYPRIVATE:
4171 name = "copyprivate";
4172 need_copy_assignment = true;
4174 case OMP_CLAUSE_COPYIN:
4176 need_copy_assignment = true;
4179 pc = &OMP_CLAUSE_CHAIN (c);
4183 t = OMP_CLAUSE_DECL (c);
4184 if (processing_template_decl
4185 && TREE_CODE (t) != VAR_DECL && TREE_CODE (t) != PARM_DECL)
4187 pc = &OMP_CLAUSE_CHAIN (c);
4193 case OMP_CLAUSE_LASTPRIVATE:
4194 if (!bitmap_bit_p (&firstprivate_head, DECL_UID (t)))
4195 need_default_ctor = true;
4198 case OMP_CLAUSE_REDUCTION:
4199 if (AGGREGATE_TYPE_P (TREE_TYPE (t))
4200 || POINTER_TYPE_P (TREE_TYPE (t)))
4202 error ("%qE has invalid type for %<reduction%>", t);
4205 else if (FLOAT_TYPE_P (TREE_TYPE (t)))
4207 enum tree_code r_code = OMP_CLAUSE_REDUCTION_CODE (c);
4217 error ("%qE has invalid type for %<reduction(%s)%>",
4218 t, operator_name_info[r_code].name);
4224 case OMP_CLAUSE_COPYIN:
4225 if (TREE_CODE (t) != VAR_DECL || !DECL_THREAD_LOCAL_P (t))
4227 error ("%qE must be %<threadprivate%> for %<copyin%>", t);
4236 if (need_complete_non_reference || need_copy_assignment)
4238 t = require_complete_type (t);
4239 if (t == error_mark_node)
4241 else if (TREE_CODE (TREE_TYPE (t)) == REFERENCE_TYPE
4242 && need_complete_non_reference)
4244 error ("%qE has reference type for %qs", t, name);
4248 if (need_implicitly_determined)
4250 const char *share_name = NULL;
4252 if (TREE_CODE (t) == VAR_DECL && DECL_THREAD_LOCAL_P (t))
4253 share_name = "threadprivate";
4254 else switch (cxx_omp_predetermined_sharing (t))
4256 case OMP_CLAUSE_DEFAULT_UNSPECIFIED:
4258 case OMP_CLAUSE_DEFAULT_SHARED:
4259 /* const vars may be specified in firstprivate clause. */
4260 if (OMP_CLAUSE_CODE (c) == OMP_CLAUSE_FIRSTPRIVATE
4261 && cxx_omp_const_qual_no_mutable (t))
4263 share_name = "shared";
4265 case OMP_CLAUSE_DEFAULT_PRIVATE:
4266 share_name = "private";
4273 error ("%qE is predetermined %qs for %qs",
4274 t, share_name, name);
4279 /* We're interested in the base element, not arrays. */
4280 inner_type = type = TREE_TYPE (t);
4281 while (TREE_CODE (inner_type) == ARRAY_TYPE)
4282 inner_type = TREE_TYPE (inner_type);
4284 /* Check for special function availability by building a call to one.
4285 Save the results, because later we won't be in the right context
4286 for making these queries. */
4287 if (CLASS_TYPE_P (inner_type)
4288 && COMPLETE_TYPE_P (inner_type)
4289 && (need_default_ctor || need_copy_ctor || need_copy_assignment)
4290 && !type_dependent_expression_p (t)
4291 && cxx_omp_create_clause_info (c, inner_type, need_default_ctor,
4292 need_copy_ctor, need_copy_assignment))
4296 *pc = OMP_CLAUSE_CHAIN (c);
4298 pc = &OMP_CLAUSE_CHAIN (c);
4301 bitmap_obstack_release (NULL);
4305 /* For all variables in the tree_list VARS, mark them as thread local. */
4308 finish_omp_threadprivate (tree vars)
4312 /* Mark every variable in VARS to be assigned thread local storage. */
4313 for (t = vars; t; t = TREE_CHAIN (t))
4315 tree v = TREE_PURPOSE (t);
4317 if (error_operand_p (v))
4319 else if (TREE_CODE (v) != VAR_DECL)
4320 error ("%<threadprivate%> %qD is not file, namespace "
4321 "or block scope variable", v);
4322 /* If V had already been marked threadprivate, it doesn't matter
4323 whether it had been used prior to this point. */
4324 else if (TREE_USED (v)
4325 && (DECL_LANG_SPECIFIC (v) == NULL
4326 || !CP_DECL_THREADPRIVATE_P (v)))
4327 error ("%qE declared %<threadprivate%> after first use", v);
4328 else if (! TREE_STATIC (v) && ! DECL_EXTERNAL (v))
4329 error ("automatic variable %qE cannot be %<threadprivate%>", v);
4330 else if (! COMPLETE_TYPE_P (TREE_TYPE (v)))
4331 error ("%<threadprivate%> %qE has incomplete type", v);
4332 else if (TREE_STATIC (v) && TYPE_P (CP_DECL_CONTEXT (v))
4333 && CP_DECL_CONTEXT (v) != current_class_type)
4334 error ("%<threadprivate%> %qE directive not "
4335 "in %qT definition", v, CP_DECL_CONTEXT (v));
4338 /* Allocate a LANG_SPECIFIC structure for V, if needed. */
4339 if (DECL_LANG_SPECIFIC (v) == NULL)
4341 retrofit_lang_decl (v);
4343 /* Make sure that DECL_DISCRIMINATOR_P continues to be true
4344 after the allocation of the lang_decl structure. */
4345 if (DECL_DISCRIMINATOR_P (v))
4346 DECL_LANG_SPECIFIC (v)->u.base.u2sel = 1;
4349 if (! DECL_THREAD_LOCAL_P (v))
4351 DECL_TLS_MODEL (v) = decl_default_tls_model (v);
4352 /* If rtl has been already set for this var, call
4353 make_decl_rtl once again, so that encode_section_info
4354 has a chance to look at the new decl flags. */
4355 if (DECL_RTL_SET_P (v))
4358 CP_DECL_THREADPRIVATE_P (v) = 1;
4363 /* Build an OpenMP structured block. */
4366 begin_omp_structured_block (void)
4368 return do_pushlevel (sk_omp);
4372 finish_omp_structured_block (tree block)
4374 return do_poplevel (block);
4377 /* Similarly, except force the retention of the BLOCK. */
4380 begin_omp_parallel (void)
4382 keep_next_level (true);
4383 return begin_omp_structured_block ();
4387 finish_omp_parallel (tree clauses, tree body)
4391 body = finish_omp_structured_block (body);
4393 stmt = make_node (OMP_PARALLEL);
4394 TREE_TYPE (stmt) = void_type_node;
4395 OMP_PARALLEL_CLAUSES (stmt) = clauses;
4396 OMP_PARALLEL_BODY (stmt) = body;
4398 return add_stmt (stmt);
4402 begin_omp_task (void)
4404 keep_next_level (true);
4405 return begin_omp_structured_block ();
4409 finish_omp_task (tree clauses, tree body)
4413 body = finish_omp_structured_block (body);
4415 stmt = make_node (OMP_TASK);
4416 TREE_TYPE (stmt) = void_type_node;
4417 OMP_TASK_CLAUSES (stmt) = clauses;
4418 OMP_TASK_BODY (stmt) = body;
4420 return add_stmt (stmt);
4423 /* Helper function for finish_omp_for. Convert Ith random access iterator
4424 into integral iterator. Return FALSE if successful. */
4427 handle_omp_for_class_iterator (int i, location_t locus, tree declv, tree initv,
4428 tree condv, tree incrv, tree *body,
4429 tree *pre_body, tree clauses)
4431 tree diff, iter_init, iter_incr = NULL, last;
4432 tree incr_var = NULL, orig_pre_body, orig_body, c;
4433 tree decl = TREE_VEC_ELT (declv, i);
4434 tree init = TREE_VEC_ELT (initv, i);
4435 tree cond = TREE_VEC_ELT (condv, i);
4436 tree incr = TREE_VEC_ELT (incrv, i);
4438 location_t elocus = locus;
4440 if (init && EXPR_HAS_LOCATION (init))
4441 elocus = EXPR_LOCATION (init);
4443 switch (TREE_CODE (cond))
4449 if (TREE_OPERAND (cond, 1) == iter)
4450 cond = build2 (swap_tree_comparison (TREE_CODE (cond)),
4451 TREE_TYPE (cond), iter, TREE_OPERAND (cond, 0));
4452 if (TREE_OPERAND (cond, 0) != iter)
4453 cond = error_mark_node;
4456 tree tem = build_x_binary_op (TREE_CODE (cond), iter, ERROR_MARK,
4457 TREE_OPERAND (cond, 1), ERROR_MARK,
4458 NULL, tf_warning_or_error);
4459 if (error_operand_p (tem))
4464 cond = error_mark_node;
4467 if (cond == error_mark_node)
4469 error_at (elocus, "invalid controlling predicate");
4472 diff = build_x_binary_op (MINUS_EXPR, TREE_OPERAND (cond, 1),
4473 ERROR_MARK, iter, ERROR_MARK, NULL,
4474 tf_warning_or_error);
4475 if (error_operand_p (diff))
4477 if (TREE_CODE (TREE_TYPE (diff)) != INTEGER_TYPE)
4479 error_at (elocus, "difference between %qE and %qD does not have integer type",
4480 TREE_OPERAND (cond, 1), iter);
4484 switch (TREE_CODE (incr))
4486 case PREINCREMENT_EXPR:
4487 case PREDECREMENT_EXPR:
4488 case POSTINCREMENT_EXPR:
4489 case POSTDECREMENT_EXPR:
4490 if (TREE_OPERAND (incr, 0) != iter)
4492 incr = error_mark_node;
4495 iter_incr = build_x_unary_op (TREE_CODE (incr), iter,
4496 tf_warning_or_error);
4497 if (error_operand_p (iter_incr))
4499 else if (TREE_CODE (incr) == PREINCREMENT_EXPR
4500 || TREE_CODE (incr) == POSTINCREMENT_EXPR)
4501 incr = integer_one_node;
4503 incr = integer_minus_one_node;
4506 if (TREE_OPERAND (incr, 0) != iter)
4507 incr = error_mark_node;
4508 else if (TREE_CODE (TREE_OPERAND (incr, 1)) == PLUS_EXPR
4509 || TREE_CODE (TREE_OPERAND (incr, 1)) == MINUS_EXPR)
4511 tree rhs = TREE_OPERAND (incr, 1);
4512 if (TREE_OPERAND (rhs, 0) == iter)
4514 if (TREE_CODE (TREE_TYPE (TREE_OPERAND (rhs, 1)))
4516 incr = error_mark_node;
4519 iter_incr = build_x_modify_expr (iter, TREE_CODE (rhs),
4520 TREE_OPERAND (rhs, 1),
4521 tf_warning_or_error);
4522 if (error_operand_p (iter_incr))
4524 incr = TREE_OPERAND (rhs, 1);
4525 incr = cp_convert (TREE_TYPE (diff), incr);
4526 if (TREE_CODE (rhs) == MINUS_EXPR)
4528 incr = build1 (NEGATE_EXPR, TREE_TYPE (diff), incr);
4529 incr = fold_if_not_in_template (incr);
4531 if (TREE_CODE (incr) != INTEGER_CST
4532 && (TREE_CODE (incr) != NOP_EXPR
4533 || (TREE_CODE (TREE_OPERAND (incr, 0))
4538 else if (TREE_OPERAND (rhs, 1) == iter)
4540 if (TREE_CODE (TREE_TYPE (TREE_OPERAND (rhs, 0))) != INTEGER_TYPE
4541 || TREE_CODE (rhs) != PLUS_EXPR)
4542 incr = error_mark_node;
4545 iter_incr = build_x_binary_op (PLUS_EXPR,
4546 TREE_OPERAND (rhs, 0),
4549 tf_warning_or_error);
4550 if (error_operand_p (iter_incr))
4552 iter_incr = build_x_modify_expr (iter, NOP_EXPR,
4554 tf_warning_or_error);
4555 if (error_operand_p (iter_incr))
4557 incr = TREE_OPERAND (rhs, 0);
4562 incr = error_mark_node;
4565 incr = error_mark_node;
4568 incr = error_mark_node;
4572 if (incr == error_mark_node)
4574 error_at (elocus, "invalid increment expression");
4578 incr = cp_convert (TREE_TYPE (diff), incr);
4579 for (c = clauses; c ; c = OMP_CLAUSE_CHAIN (c))
4580 if (OMP_CLAUSE_CODE (c) == OMP_CLAUSE_LASTPRIVATE
4581 && OMP_CLAUSE_DECL (c) == iter)
4584 decl = create_temporary_var (TREE_TYPE (diff));
4586 add_decl_expr (decl);
4587 last = create_temporary_var (TREE_TYPE (diff));
4589 add_decl_expr (last);
4590 if (c && iter_incr == NULL)
4592 incr_var = create_temporary_var (TREE_TYPE (diff));
4593 pushdecl (incr_var);
4594 add_decl_expr (incr_var);
4596 gcc_assert (stmts_are_full_exprs_p ());
4598 orig_pre_body = *pre_body;
4599 *pre_body = push_stmt_list ();
4601 add_stmt (orig_pre_body);
4603 finish_expr_stmt (build_x_modify_expr (iter, NOP_EXPR, init,
4604 tf_warning_or_error));
4605 init = build_int_cst (TREE_TYPE (diff), 0);
4606 if (c && iter_incr == NULL)
4608 finish_expr_stmt (build_x_modify_expr (incr_var, NOP_EXPR,
4609 incr, tf_warning_or_error));
4611 iter_incr = build_x_modify_expr (iter, PLUS_EXPR, incr,
4612 tf_warning_or_error);
4614 finish_expr_stmt (build_x_modify_expr (last, NOP_EXPR, init,
4615 tf_warning_or_error));
4616 *pre_body = pop_stmt_list (*pre_body);
4618 cond = cp_build_binary_op (elocus,
4619 TREE_CODE (cond), decl, diff,
4620 tf_warning_or_error);
4621 incr = build_modify_expr (elocus, decl, NULL_TREE, PLUS_EXPR,
4622 elocus, incr, NULL_TREE);
4625 *body = push_stmt_list ();
4626 iter_init = build2 (MINUS_EXPR, TREE_TYPE (diff), decl, last);
4627 iter_init = build_x_modify_expr (iter, PLUS_EXPR, iter_init,
4628 tf_warning_or_error);
4629 iter_init = build1 (NOP_EXPR, void_type_node, iter_init);
4630 finish_expr_stmt (iter_init);
4631 finish_expr_stmt (build_x_modify_expr (last, NOP_EXPR, decl,
4632 tf_warning_or_error));
4633 add_stmt (orig_body);
4634 *body = pop_stmt_list (*body);
4638 OMP_CLAUSE_LASTPRIVATE_STMT (c) = push_stmt_list ();
4639 finish_expr_stmt (iter_incr);
4640 OMP_CLAUSE_LASTPRIVATE_STMT (c)
4641 = pop_stmt_list (OMP_CLAUSE_LASTPRIVATE_STMT (c));
4644 TREE_VEC_ELT (declv, i) = decl;
4645 TREE_VEC_ELT (initv, i) = init;
4646 TREE_VEC_ELT (condv, i) = cond;
4647 TREE_VEC_ELT (incrv, i) = incr;
4652 /* Build and validate an OMP_FOR statement. CLAUSES, BODY, COND, INCR
4653 are directly for their associated operands in the statement. DECL
4654 and INIT are a combo; if DECL is NULL then INIT ought to be a
4655 MODIFY_EXPR, and the DECL should be extracted. PRE_BODY are
4656 optional statements that need to go before the loop into its
4660 finish_omp_for (location_t locus, tree declv, tree initv, tree condv,
4661 tree incrv, tree body, tree pre_body, tree clauses)
4663 tree omp_for = NULL, orig_incr = NULL;
4664 tree decl, init, cond, incr;
4668 gcc_assert (TREE_VEC_LENGTH (declv) == TREE_VEC_LENGTH (initv));
4669 gcc_assert (TREE_VEC_LENGTH (declv) == TREE_VEC_LENGTH (condv));
4670 gcc_assert (TREE_VEC_LENGTH (declv) == TREE_VEC_LENGTH (incrv));
4671 for (i = 0; i < TREE_VEC_LENGTH (declv); i++)
4673 decl = TREE_VEC_ELT (declv, i);
4674 init = TREE_VEC_ELT (initv, i);
4675 cond = TREE_VEC_ELT (condv, i);
4676 incr = TREE_VEC_ELT (incrv, i);
4682 switch (TREE_CODE (init))
4685 decl = TREE_OPERAND (init, 0);
4686 init = TREE_OPERAND (init, 1);
4689 if (TREE_CODE (TREE_OPERAND (init, 1)) == NOP_EXPR)
4691 decl = TREE_OPERAND (init, 0);
4692 init = TREE_OPERAND (init, 2);
4702 "expected iteration declaration or initialization");
4707 if (init && EXPR_HAS_LOCATION (init))
4708 elocus = EXPR_LOCATION (init);
4712 error_at (elocus, "missing controlling predicate");
4718 error_at (elocus, "missing increment expression");
4722 TREE_VEC_ELT (declv, i) = decl;
4723 TREE_VEC_ELT (initv, i) = init;
4726 if (dependent_omp_for_p (declv, initv, condv, incrv))
4730 stmt = make_node (OMP_FOR);
4732 for (i = 0; i < TREE_VEC_LENGTH (declv); i++)
4734 /* This is really just a place-holder. We'll be decomposing this
4735 again and going through the cp_build_modify_expr path below when
4736 we instantiate the thing. */
4737 TREE_VEC_ELT (initv, i)
4738 = build2 (MODIFY_EXPR, void_type_node, TREE_VEC_ELT (declv, i),
4739 TREE_VEC_ELT (initv, i));
4742 TREE_TYPE (stmt) = void_type_node;
4743 OMP_FOR_INIT (stmt) = initv;
4744 OMP_FOR_COND (stmt) = condv;
4745 OMP_FOR_INCR (stmt) = incrv;
4746 OMP_FOR_BODY (stmt) = body;
4747 OMP_FOR_PRE_BODY (stmt) = pre_body;
4748 OMP_FOR_CLAUSES (stmt) = clauses;
4750 SET_EXPR_LOCATION (stmt, locus);
4751 return add_stmt (stmt);
4754 if (processing_template_decl)
4755 orig_incr = make_tree_vec (TREE_VEC_LENGTH (incrv));
4757 for (i = 0; i < TREE_VEC_LENGTH (declv); )
4759 decl = TREE_VEC_ELT (declv, i);
4760 init = TREE_VEC_ELT (initv, i);
4761 cond = TREE_VEC_ELT (condv, i);
4762 incr = TREE_VEC_ELT (incrv, i);
4764 TREE_VEC_ELT (orig_incr, i) = incr;
4767 if (init && EXPR_HAS_LOCATION (init))
4768 elocus = EXPR_LOCATION (init);
4772 error_at (elocus, "expected iteration declaration or initialization");
4776 if (incr && TREE_CODE (incr) == MODOP_EXPR)
4779 TREE_VEC_ELT (orig_incr, i) = incr;
4780 incr = cp_build_modify_expr (TREE_OPERAND (incr, 0),
4781 TREE_CODE (TREE_OPERAND (incr, 1)),
4782 TREE_OPERAND (incr, 2),
4783 tf_warning_or_error);
4786 if (CLASS_TYPE_P (TREE_TYPE (decl)))
4788 if (handle_omp_for_class_iterator (i, locus, declv, initv, condv,
4789 incrv, &body, &pre_body, clauses))
4794 if (!INTEGRAL_TYPE_P (TREE_TYPE (decl))
4795 && TREE_CODE (TREE_TYPE (decl)) != POINTER_TYPE)
4797 error_at (elocus, "invalid type for iteration variable %qE", decl);
4801 if (!processing_template_decl)
4803 init = fold_build_cleanup_point_expr (TREE_TYPE (init), init);
4804 init = cp_build_modify_expr (decl, NOP_EXPR, init, tf_warning_or_error);
4807 init = build2 (MODIFY_EXPR, void_type_node, decl, init);
4809 && TREE_SIDE_EFFECTS (cond)
4810 && COMPARISON_CLASS_P (cond)
4811 && !processing_template_decl)
4813 tree t = TREE_OPERAND (cond, 0);
4814 if (TREE_SIDE_EFFECTS (t)
4816 && (TREE_CODE (t) != NOP_EXPR
4817 || TREE_OPERAND (t, 0) != decl))
4818 TREE_OPERAND (cond, 0)
4819 = fold_build_cleanup_point_expr (TREE_TYPE (t), t);
4821 t = TREE_OPERAND (cond, 1);
4822 if (TREE_SIDE_EFFECTS (t)
4824 && (TREE_CODE (t) != NOP_EXPR
4825 || TREE_OPERAND (t, 0) != decl))
4826 TREE_OPERAND (cond, 1)
4827 = fold_build_cleanup_point_expr (TREE_TYPE (t), t);
4829 if (decl == error_mark_node || init == error_mark_node)
4832 TREE_VEC_ELT (declv, i) = decl;
4833 TREE_VEC_ELT (initv, i) = init;
4834 TREE_VEC_ELT (condv, i) = cond;
4835 TREE_VEC_ELT (incrv, i) = incr;
4839 if (IS_EMPTY_STMT (pre_body))
4842 omp_for = c_finish_omp_for (locus, declv, initv, condv, incrv,
4845 if (omp_for == NULL)
4848 for (i = 0; i < TREE_VEC_LENGTH (OMP_FOR_INCR (omp_for)); i++)
4850 decl = TREE_OPERAND (TREE_VEC_ELT (OMP_FOR_INIT (omp_for), i), 0);
4851 incr = TREE_VEC_ELT (OMP_FOR_INCR (omp_for), i);
4853 if (TREE_CODE (incr) != MODIFY_EXPR)
4856 if (TREE_SIDE_EFFECTS (TREE_OPERAND (incr, 1))
4857 && BINARY_CLASS_P (TREE_OPERAND (incr, 1))
4858 && !processing_template_decl)
4860 tree t = TREE_OPERAND (TREE_OPERAND (incr, 1), 0);
4861 if (TREE_SIDE_EFFECTS (t)
4863 && (TREE_CODE (t) != NOP_EXPR
4864 || TREE_OPERAND (t, 0) != decl))
4865 TREE_OPERAND (TREE_OPERAND (incr, 1), 0)
4866 = fold_build_cleanup_point_expr (TREE_TYPE (t), t);
4868 t = TREE_OPERAND (TREE_OPERAND (incr, 1), 1);
4869 if (TREE_SIDE_EFFECTS (t)
4871 && (TREE_CODE (t) != NOP_EXPR
4872 || TREE_OPERAND (t, 0) != decl))
4873 TREE_OPERAND (TREE_OPERAND (incr, 1), 1)
4874 = fold_build_cleanup_point_expr (TREE_TYPE (t), t);
4878 TREE_VEC_ELT (OMP_FOR_INCR (omp_for), i) = TREE_VEC_ELT (orig_incr, i);
4880 if (omp_for != NULL)
4881 OMP_FOR_CLAUSES (omp_for) = clauses;
4886 finish_omp_atomic (enum tree_code code, enum tree_code opcode, tree lhs,
4887 tree rhs, tree v, tree lhs1, tree rhs1)
4902 dependent_p = false;
4905 /* Even in a template, we can detect invalid uses of the atomic
4906 pragma if neither LHS nor RHS is type-dependent. */
4907 if (processing_template_decl)
4909 dependent_p = (type_dependent_expression_p (lhs)
4910 || (rhs && type_dependent_expression_p (rhs))
4911 || (v && type_dependent_expression_p (v))
4912 || (lhs1 && type_dependent_expression_p (lhs1))
4913 || (rhs1 && type_dependent_expression_p (rhs1)));
4916 lhs = build_non_dependent_expr (lhs);
4918 rhs = build_non_dependent_expr (rhs);
4920 v = build_non_dependent_expr (v);
4922 lhs1 = build_non_dependent_expr (lhs1);
4924 rhs1 = build_non_dependent_expr (rhs1);
4929 stmt = c_finish_omp_atomic (input_location, code, opcode, lhs, rhs,
4931 if (stmt == error_mark_node)
4934 if (processing_template_decl)
4936 if (code == OMP_ATOMIC_READ)
4938 stmt = build_min_nt (OMP_ATOMIC_READ, orig_lhs);
4939 stmt = build2 (MODIFY_EXPR, void_type_node, orig_v, stmt);
4943 if (opcode == NOP_EXPR)
4944 stmt = build2 (MODIFY_EXPR, void_type_node, orig_lhs, orig_rhs);
4946 stmt = build2 (opcode, void_type_node, orig_lhs, orig_rhs);
4948 stmt = build_min_nt (COMPOUND_EXPR, orig_rhs1, stmt);
4949 if (code != OMP_ATOMIC)
4951 stmt = build_min_nt (code, orig_lhs1, stmt);
4952 stmt = build2 (MODIFY_EXPR, void_type_node, orig_v, stmt);
4955 stmt = build2 (OMP_ATOMIC, void_type_node, integer_zero_node, stmt);
4961 finish_omp_barrier (void)
4963 tree fn = builtin_decl_explicit (BUILT_IN_GOMP_BARRIER);
4964 VEC(tree,gc) *vec = make_tree_vector ();
4965 tree stmt = finish_call_expr (fn, &vec, false, false, tf_warning_or_error);
4966 release_tree_vector (vec);
4967 finish_expr_stmt (stmt);
4971 finish_omp_flush (void)
4973 tree fn = builtin_decl_explicit (BUILT_IN_SYNC_SYNCHRONIZE);
4974 VEC(tree,gc) *vec = make_tree_vector ();
4975 tree stmt = finish_call_expr (fn, &vec, false, false, tf_warning_or_error);
4976 release_tree_vector (vec);
4977 finish_expr_stmt (stmt);
4981 finish_omp_taskwait (void)
4983 tree fn = builtin_decl_explicit (BUILT_IN_GOMP_TASKWAIT);
4984 VEC(tree,gc) *vec = make_tree_vector ();
4985 tree stmt = finish_call_expr (fn, &vec, false, false, tf_warning_or_error);
4986 release_tree_vector (vec);
4987 finish_expr_stmt (stmt);
4991 finish_omp_taskyield (void)
4993 tree fn = builtin_decl_explicit (BUILT_IN_GOMP_TASKYIELD);
4994 VEC(tree,gc) *vec = make_tree_vector ();
4995 tree stmt = finish_call_expr (fn, &vec, false, false, tf_warning_or_error);
4996 release_tree_vector (vec);
4997 finish_expr_stmt (stmt);
5000 /* Begin a __transaction_atomic or __transaction_relaxed statement.
5001 If PCOMPOUND is non-null, this is for a function-transaction-block, and we
5002 should create an extra compound stmt. */
5005 begin_transaction_stmt (location_t loc, tree *pcompound, int flags)
5010 *pcompound = begin_compound_stmt (0);
5012 r = build_stmt (loc, TRANSACTION_EXPR, NULL_TREE);
5014 /* Only add the statement to the function if support enabled. */
5018 error_at (loc, ((flags & TM_STMT_ATTR_RELAXED) != 0
5019 ? G_("%<__transaction_relaxed%> without "
5020 "transactional memory support enabled")
5021 : G_("%<__transaction_atomic%> without "
5022 "transactional memory support enabled")));
5024 TRANSACTION_EXPR_BODY (r) = push_stmt_list ();
5028 /* End a __transaction_atomic or __transaction_relaxed statement.
5029 If COMPOUND_STMT is non-null, this is for a function-transaction-block,
5030 and we should end the compound. If NOEX is non-NULL, we wrap the body in
5031 a MUST_NOT_THROW_EXPR with NOEX as condition. */
5034 finish_transaction_stmt (tree stmt, tree compound_stmt, int flags, tree noex)
5036 TRANSACTION_EXPR_BODY (stmt) = pop_stmt_list (TRANSACTION_EXPR_BODY (stmt));
5037 TRANSACTION_EXPR_OUTER (stmt) = (flags & TM_STMT_ATTR_OUTER) != 0;
5038 TRANSACTION_EXPR_RELAXED (stmt) = (flags & TM_STMT_ATTR_RELAXED) != 0;
5039 TRANSACTION_EXPR_IS_STMT (stmt) = 1;
5041 /* noexcept specifications are not allowed for function transactions. */
5042 gcc_assert (!(noex && compound_stmt));
5045 tree body = build_must_not_throw_expr (TRANSACTION_EXPR_BODY (stmt),
5047 SET_EXPR_LOCATION (body, EXPR_LOCATION (TRANSACTION_EXPR_BODY (stmt)));
5048 TREE_SIDE_EFFECTS (body) = 1;
5049 TRANSACTION_EXPR_BODY (stmt) = body;
5053 finish_compound_stmt (compound_stmt);
5057 /* Build a __transaction_atomic or __transaction_relaxed expression. If
5058 NOEX is non-NULL, we wrap the body in a MUST_NOT_THROW_EXPR with NOEX as
5062 build_transaction_expr (location_t loc, tree expr, int flags, tree noex)
5067 expr = build_must_not_throw_expr (expr, noex);
5068 SET_EXPR_LOCATION (expr, loc);
5069 TREE_SIDE_EFFECTS (expr) = 1;
5071 ret = build1 (TRANSACTION_EXPR, TREE_TYPE (expr), expr);
5072 if (flags & TM_STMT_ATTR_RELAXED)
5073 TRANSACTION_EXPR_RELAXED (ret) = 1;
5074 SET_EXPR_LOCATION (ret, loc);
5079 init_cp_semantics (void)
5083 /* Build a STATIC_ASSERT for a static assertion with the condition
5084 CONDITION and the message text MESSAGE. LOCATION is the location
5085 of the static assertion in the source code. When MEMBER_P, this
5086 static assertion is a member of a class. */
5088 finish_static_assert (tree condition, tree message, location_t location,
5091 if (check_for_bare_parameter_packs (condition))
5092 condition = error_mark_node;
5094 if (type_dependent_expression_p (condition)
5095 || value_dependent_expression_p (condition))
5097 /* We're in a template; build a STATIC_ASSERT and put it in
5101 assertion = make_node (STATIC_ASSERT);
5102 STATIC_ASSERT_CONDITION (assertion) = condition;
5103 STATIC_ASSERT_MESSAGE (assertion) = message;
5104 STATIC_ASSERT_SOURCE_LOCATION (assertion) = location;
5107 maybe_add_class_template_decl_list (current_class_type,
5111 add_stmt (assertion);
5116 /* Fold the expression and convert it to a boolean value. */
5117 condition = fold_non_dependent_expr (condition);
5118 condition = cp_convert (boolean_type_node, condition);
5119 condition = maybe_constant_value (condition);
5121 if (TREE_CODE (condition) == INTEGER_CST && !integer_zerop (condition))
5122 /* Do nothing; the condition is satisfied. */
5126 location_t saved_loc = input_location;
5128 input_location = location;
5129 if (TREE_CODE (condition) == INTEGER_CST
5130 && integer_zerop (condition))
5131 /* Report the error. */
5132 error ("static assertion failed: %s", TREE_STRING_POINTER (message));
5133 else if (condition && condition != error_mark_node)
5135 error ("non-constant condition for static assertion");
5136 cxx_constant_value (condition);
5138 input_location = saved_loc;
5142 /* Implements the C++0x decltype keyword. Returns the type of EXPR,
5143 suitable for use as a type-specifier.
5145 ID_EXPRESSION_OR_MEMBER_ACCESS_P is true when EXPR was parsed as an
5146 id-expression or a class member access, FALSE when it was parsed as
5147 a full expression. */
5150 finish_decltype_type (tree expr, bool id_expression_or_member_access_p,
5151 tsubst_flags_t complain)
5153 tree type = NULL_TREE;
5155 if (!expr || error_operand_p (expr))
5156 return error_mark_node;
5159 || TREE_CODE (expr) == TYPE_DECL
5160 || (TREE_CODE (expr) == BIT_NOT_EXPR
5161 && TYPE_P (TREE_OPERAND (expr, 0))))
5163 if (complain & tf_error)
5164 error ("argument to decltype must be an expression");
5165 return error_mark_node;
5168 /* FIXME instantiation-dependent */
5169 if (type_dependent_expression_p (expr)
5170 /* In a template, a COMPONENT_REF has an IDENTIFIER_NODE for op1 even
5171 if it isn't dependent, so that we can check access control at
5172 instantiation time, so defer the decltype as well (PR 42277). */
5173 || (id_expression_or_member_access_p
5174 && processing_template_decl
5175 && TREE_CODE (expr) == COMPONENT_REF))
5177 type = cxx_make_type (DECLTYPE_TYPE);
5178 DECLTYPE_TYPE_EXPR (type) = expr;
5179 DECLTYPE_TYPE_ID_EXPR_OR_MEMBER_ACCESS_P (type)
5180 = id_expression_or_member_access_p;
5181 SET_TYPE_STRUCTURAL_EQUALITY (type);
5186 /* The type denoted by decltype(e) is defined as follows: */
5188 expr = resolve_nondeduced_context (expr);
5190 if (type_unknown_p (expr))
5192 if (complain & tf_error)
5193 error ("decltype cannot resolve address of overloaded function");
5194 return error_mark_node;
5197 if (invalid_nonstatic_memfn_p (expr, complain))
5198 return error_mark_node;
5200 /* To get the size of a static data member declared as an array of
5201 unknown bound, we need to instantiate it. */
5202 if (TREE_CODE (expr) == VAR_DECL
5203 && VAR_HAD_UNKNOWN_BOUND (expr)
5204 && DECL_TEMPLATE_INSTANTIATION (expr))
5205 instantiate_decl (expr, /*defer_ok*/true, /*expl_inst_mem*/false);
5207 if (id_expression_or_member_access_p)
5209 /* If e is an id-expression or a class member access (5.2.5
5210 [expr.ref]), decltype(e) is defined as the type of the entity
5211 named by e. If there is no such entity, or e names a set of
5212 overloaded functions, the program is ill-formed. */
5213 if (TREE_CODE (expr) == IDENTIFIER_NODE)
5214 expr = lookup_name (expr);
5216 if (TREE_CODE (expr) == INDIRECT_REF)
5217 /* This can happen when the expression is, e.g., "a.b". Just
5218 look at the underlying operand. */
5219 expr = TREE_OPERAND (expr, 0);
5221 if (TREE_CODE (expr) == OFFSET_REF
5222 || TREE_CODE (expr) == MEMBER_REF)
5223 /* We're only interested in the field itself. If it is a
5224 BASELINK, we will need to see through it in the next
5226 expr = TREE_OPERAND (expr, 1);
5228 if (BASELINK_P (expr))
5229 /* See through BASELINK nodes to the underlying function. */
5230 expr = BASELINK_FUNCTIONS (expr);
5232 switch (TREE_CODE (expr))
5235 if (DECL_BIT_FIELD_TYPE (expr))
5237 type = DECL_BIT_FIELD_TYPE (expr);
5240 /* Fall through for fields that aren't bitfields. */
5247 case TEMPLATE_PARM_INDEX:
5248 expr = mark_type_use (expr);
5249 type = TREE_TYPE (expr);
5253 type = error_mark_node;
5257 mark_type_use (expr);
5258 type = is_bitfield_expr_with_lowered_type (expr);
5260 type = TREE_TYPE (TREE_OPERAND (expr, 1));
5268 /* We can get here when the id-expression refers to an
5269 enumerator or non-type template parameter. */
5270 type = TREE_TYPE (expr);
5275 return error_mark_node;
5280 /* Within a lambda-expression:
5282 Every occurrence of decltype((x)) where x is a possibly
5283 parenthesized id-expression that names an entity of
5284 automatic storage duration is treated as if x were
5285 transformed into an access to a corresponding data member
5286 of the closure type that would have been declared if x
5287 were a use of the denoted entity. */
5288 if (outer_automatic_var_p (expr)
5289 && current_function_decl
5290 && LAMBDA_FUNCTION_P (current_function_decl))
5291 type = capture_decltype (expr);
5292 else if (error_operand_p (expr))
5293 type = error_mark_node;
5294 else if (expr == current_class_ptr)
5295 /* If the expression is just "this", we want the
5296 cv-unqualified pointer for the "this" type. */
5297 type = TYPE_MAIN_VARIANT (TREE_TYPE (expr));
5300 /* Otherwise, where T is the type of e, if e is an lvalue,
5301 decltype(e) is defined as T&; if an xvalue, T&&; otherwise, T. */
5302 cp_lvalue_kind clk = lvalue_kind (expr);
5303 type = unlowered_expr_type (expr);
5304 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5305 if (clk != clk_none && !(clk & clk_class))
5306 type = cp_build_reference_type (type, (clk & clk_rvalueref));
5313 /* Called from trait_expr_value to evaluate either __has_nothrow_assign or
5314 __has_nothrow_copy, depending on assign_p. */
5317 classtype_has_nothrow_assign_or_copy_p (tree type, bool assign_p)
5324 ix = lookup_fnfields_1 (type, ansi_assopname (NOP_EXPR));
5327 fns = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), ix);
5329 else if (TYPE_HAS_COPY_CTOR (type))
5331 /* If construction of the copy constructor was postponed, create
5333 if (CLASSTYPE_LAZY_COPY_CTOR (type))
5334 lazily_declare_fn (sfk_copy_constructor, type);
5335 if (CLASSTYPE_LAZY_MOVE_CTOR (type))
5336 lazily_declare_fn (sfk_move_constructor, type);
5337 fns = CLASSTYPE_CONSTRUCTORS (type);
5342 for (; fns; fns = OVL_NEXT (fns))
5344 tree fn = OVL_CURRENT (fns);
5348 if (copy_fn_p (fn) == 0)
5351 else if (copy_fn_p (fn) <= 0)
5354 if (!TYPE_NOTHROW_P (TREE_TYPE (fn)))
5361 /* Actually evaluates the trait. */
5364 trait_expr_value (cp_trait_kind kind, tree type1, tree type2)
5366 enum tree_code type_code1;
5369 type_code1 = TREE_CODE (type1);
5373 case CPTK_HAS_NOTHROW_ASSIGN:
5374 type1 = strip_array_types (type1);
5375 return (!CP_TYPE_CONST_P (type1) && type_code1 != REFERENCE_TYPE
5376 && (trait_expr_value (CPTK_HAS_TRIVIAL_ASSIGN, type1, type2)
5377 || (CLASS_TYPE_P (type1)
5378 && classtype_has_nothrow_assign_or_copy_p (type1,
5381 case CPTK_HAS_TRIVIAL_ASSIGN:
5382 /* ??? The standard seems to be missing the "or array of such a class
5383 type" wording for this trait. */
5384 type1 = strip_array_types (type1);
5385 return (!CP_TYPE_CONST_P (type1) && type_code1 != REFERENCE_TYPE
5386 && (trivial_type_p (type1)
5387 || (CLASS_TYPE_P (type1)
5388 && TYPE_HAS_TRIVIAL_COPY_ASSIGN (type1))));
5390 case CPTK_HAS_NOTHROW_CONSTRUCTOR:
5391 type1 = strip_array_types (type1);
5392 return (trait_expr_value (CPTK_HAS_TRIVIAL_CONSTRUCTOR, type1, type2)
5393 || (CLASS_TYPE_P (type1)
5394 && (t = locate_ctor (type1))
5395 && TYPE_NOTHROW_P (TREE_TYPE (t))));
5397 case CPTK_HAS_TRIVIAL_CONSTRUCTOR:
5398 type1 = strip_array_types (type1);
5399 return (trivial_type_p (type1)
5400 || (CLASS_TYPE_P (type1) && TYPE_HAS_TRIVIAL_DFLT (type1)));
5402 case CPTK_HAS_NOTHROW_COPY:
5403 type1 = strip_array_types (type1);
5404 return (trait_expr_value (CPTK_HAS_TRIVIAL_COPY, type1, type2)
5405 || (CLASS_TYPE_P (type1)
5406 && classtype_has_nothrow_assign_or_copy_p (type1, false)));
5408 case CPTK_HAS_TRIVIAL_COPY:
5409 /* ??? The standard seems to be missing the "or array of such a class
5410 type" wording for this trait. */
5411 type1 = strip_array_types (type1);
5412 return (trivial_type_p (type1) || type_code1 == REFERENCE_TYPE
5413 || (CLASS_TYPE_P (type1) && TYPE_HAS_TRIVIAL_COPY_CTOR (type1)));
5415 case CPTK_HAS_TRIVIAL_DESTRUCTOR:
5416 type1 = strip_array_types (type1);
5417 return (trivial_type_p (type1) || type_code1 == REFERENCE_TYPE
5418 || (CLASS_TYPE_P (type1)
5419 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type1)));
5421 case CPTK_HAS_VIRTUAL_DESTRUCTOR:
5422 return type_has_virtual_destructor (type1);
5424 case CPTK_IS_ABSTRACT:
5425 return (CLASS_TYPE_P (type1) && CLASSTYPE_PURE_VIRTUALS (type1));
5427 case CPTK_IS_BASE_OF:
5428 return (NON_UNION_CLASS_TYPE_P (type1) && NON_UNION_CLASS_TYPE_P (type2)
5429 && DERIVED_FROM_P (type1, type2));
5432 return (NON_UNION_CLASS_TYPE_P (type1));
5434 case CPTK_IS_CONVERTIBLE_TO:
5439 return (NON_UNION_CLASS_TYPE_P (type1) && CLASSTYPE_EMPTY_P (type1));
5442 return (type_code1 == ENUMERAL_TYPE);
5445 return (CLASS_TYPE_P (type1) && CLASSTYPE_FINAL (type1));
5447 case CPTK_IS_LITERAL_TYPE:
5448 return (literal_type_p (type1));
5451 return (pod_type_p (type1));
5453 case CPTK_IS_POLYMORPHIC:
5454 return (CLASS_TYPE_P (type1) && TYPE_POLYMORPHIC_P (type1));
5456 case CPTK_IS_STD_LAYOUT:
5457 return (std_layout_type_p (type1));
5459 case CPTK_IS_TRIVIAL:
5460 return (trivial_type_p (type1));
5463 return (type_code1 == UNION_TYPE);
5471 /* If TYPE is an array of unknown bound, or (possibly cv-qualified)
5472 void, or a complete type, returns it, otherwise NULL_TREE. */
5475 check_trait_type (tree type)
5477 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
5478 && COMPLETE_TYPE_P (TREE_TYPE (type)))
5481 if (VOID_TYPE_P (type))
5484 return complete_type_or_else (strip_array_types (type), NULL_TREE);
5487 /* Process a trait expression. */
5490 finish_trait_expr (cp_trait_kind kind, tree type1, tree type2)
5492 gcc_assert (kind == CPTK_HAS_NOTHROW_ASSIGN
5493 || kind == CPTK_HAS_NOTHROW_CONSTRUCTOR
5494 || kind == CPTK_HAS_NOTHROW_COPY
5495 || kind == CPTK_HAS_TRIVIAL_ASSIGN
5496 || kind == CPTK_HAS_TRIVIAL_CONSTRUCTOR
5497 || kind == CPTK_HAS_TRIVIAL_COPY
5498 || kind == CPTK_HAS_TRIVIAL_DESTRUCTOR
5499 || kind == CPTK_HAS_VIRTUAL_DESTRUCTOR
5500 || kind == CPTK_IS_ABSTRACT
5501 || kind == CPTK_IS_BASE_OF
5502 || kind == CPTK_IS_CLASS
5503 || kind == CPTK_IS_CONVERTIBLE_TO
5504 || kind == CPTK_IS_EMPTY
5505 || kind == CPTK_IS_ENUM
5506 || kind == CPTK_IS_FINAL
5507 || kind == CPTK_IS_LITERAL_TYPE
5508 || kind == CPTK_IS_POD
5509 || kind == CPTK_IS_POLYMORPHIC
5510 || kind == CPTK_IS_STD_LAYOUT
5511 || kind == CPTK_IS_TRIVIAL
5512 || kind == CPTK_IS_UNION);
5514 if (kind == CPTK_IS_CONVERTIBLE_TO)
5516 sorry ("__is_convertible_to");
5517 return error_mark_node;
5520 if (type1 == error_mark_node
5521 || ((kind == CPTK_IS_BASE_OF || kind == CPTK_IS_CONVERTIBLE_TO)
5522 && type2 == error_mark_node))
5523 return error_mark_node;
5525 if (processing_template_decl)
5527 tree trait_expr = make_node (TRAIT_EXPR);
5528 TREE_TYPE (trait_expr) = boolean_type_node;
5529 TRAIT_EXPR_TYPE1 (trait_expr) = type1;
5530 TRAIT_EXPR_TYPE2 (trait_expr) = type2;
5531 TRAIT_EXPR_KIND (trait_expr) = kind;
5537 case CPTK_HAS_NOTHROW_ASSIGN:
5538 case CPTK_HAS_TRIVIAL_ASSIGN:
5539 case CPTK_HAS_NOTHROW_CONSTRUCTOR:
5540 case CPTK_HAS_TRIVIAL_CONSTRUCTOR:
5541 case CPTK_HAS_NOTHROW_COPY:
5542 case CPTK_HAS_TRIVIAL_COPY:
5543 case CPTK_HAS_TRIVIAL_DESTRUCTOR:
5544 case CPTK_HAS_VIRTUAL_DESTRUCTOR:
5545 case CPTK_IS_ABSTRACT:
5548 case CPTK_IS_LITERAL_TYPE:
5550 case CPTK_IS_POLYMORPHIC:
5551 case CPTK_IS_STD_LAYOUT:
5552 case CPTK_IS_TRIVIAL:
5553 if (!check_trait_type (type1))
5554 return error_mark_node;
5557 case CPTK_IS_BASE_OF:
5558 if (NON_UNION_CLASS_TYPE_P (type1) && NON_UNION_CLASS_TYPE_P (type2)
5559 && !same_type_ignoring_top_level_qualifiers_p (type1, type2)
5560 && !complete_type_or_else (type2, NULL_TREE))
5561 /* We already issued an error. */
5562 return error_mark_node;
5570 case CPTK_IS_CONVERTIBLE_TO:
5575 return (trait_expr_value (kind, type1, type2)
5576 ? boolean_true_node : boolean_false_node);
5579 /* Do-nothing variants of functions to handle pragma FLOAT_CONST_DECIMAL64,
5580 which is ignored for C++. */
5583 set_float_const_decimal64 (void)
5588 clear_float_const_decimal64 (void)
5593 float_const_decimal64_p (void)
5599 /* Return true if T is a literal type. */
5602 literal_type_p (tree t)
5604 if (SCALAR_TYPE_P (t)
5605 || TREE_CODE (t) == REFERENCE_TYPE)
5607 if (CLASS_TYPE_P (t))
5609 t = complete_type (t);
5610 gcc_assert (COMPLETE_TYPE_P (t) || errorcount);
5611 return CLASSTYPE_LITERAL_P (t);
5613 if (TREE_CODE (t) == ARRAY_TYPE)
5614 return literal_type_p (strip_array_types (t));
5618 /* If DECL is a variable declared `constexpr', require its type
5619 be literal. Return the DECL if OK, otherwise NULL. */
5622 ensure_literal_type_for_constexpr_object (tree decl)
5624 tree type = TREE_TYPE (decl);
5625 if (TREE_CODE (decl) == VAR_DECL && DECL_DECLARED_CONSTEXPR_P (decl)
5626 && !processing_template_decl)
5628 if (CLASS_TYPE_P (type) && !COMPLETE_TYPE_P (complete_type (type)))
5629 /* Don't complain here, we'll complain about incompleteness
5630 when we try to initialize the variable. */;
5631 else if (!literal_type_p (type))
5633 error ("the type %qT of constexpr variable %qD is not literal",
5635 explain_non_literal_class (type);
5642 /* Representation of entries in the constexpr function definition table. */
5644 typedef struct GTY(()) constexpr_fundef {
5649 /* This table holds all constexpr function definitions seen in
5650 the current translation unit. */
5652 static GTY ((param_is (constexpr_fundef))) htab_t constexpr_fundef_table;
5654 /* Utility function used for managing the constexpr function table.
5655 Return true if the entries pointed to by P and Q are for the
5656 same constexpr function. */
5659 constexpr_fundef_equal (const void *p, const void *q)
5661 const constexpr_fundef *lhs = (const constexpr_fundef *) p;
5662 const constexpr_fundef *rhs = (const constexpr_fundef *) q;
5663 return lhs->decl == rhs->decl;
5666 /* Utility function used for managing the constexpr function table.
5667 Return a hash value for the entry pointed to by Q. */
5669 static inline hashval_t
5670 constexpr_fundef_hash (const void *p)
5672 const constexpr_fundef *fundef = (const constexpr_fundef *) p;
5673 return DECL_UID (fundef->decl);
5676 /* Return a previously saved definition of function FUN. */
5678 static constexpr_fundef *
5679 retrieve_constexpr_fundef (tree fun)
5681 constexpr_fundef fundef = { NULL, NULL };
5682 if (constexpr_fundef_table == NULL)
5686 return (constexpr_fundef *) htab_find (constexpr_fundef_table, &fundef);
5689 /* Check whether the parameter and return types of FUN are valid for a
5690 constexpr function, and complain if COMPLAIN. */
5693 is_valid_constexpr_fn (tree fun, bool complain)
5695 tree parm = FUNCTION_FIRST_USER_PARM (fun);
5697 for (; parm != NULL; parm = TREE_CHAIN (parm))
5698 if (!literal_type_p (TREE_TYPE (parm)))
5703 error ("invalid type for parameter %d of constexpr "
5704 "function %q+#D", DECL_PARM_INDEX (parm), fun);
5705 explain_non_literal_class (TREE_TYPE (parm));
5709 if (!DECL_CONSTRUCTOR_P (fun))
5711 tree rettype = TREE_TYPE (TREE_TYPE (fun));
5712 if (!literal_type_p (rettype))
5717 error ("invalid return type %qT of constexpr function %q+D",
5719 explain_non_literal_class (rettype);
5723 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fun)
5724 && !CLASSTYPE_LITERAL_P (DECL_CONTEXT (fun)))
5729 error ("enclosing class of constexpr non-static member "
5730 "function %q+#D is not a literal type", fun);
5731 explain_non_literal_class (DECL_CONTEXT (fun));
5735 else if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fun)))
5739 error ("%q#T has virtual base classes", DECL_CONTEXT (fun));
5745 /* Subroutine of build_constexpr_constructor_member_initializers.
5746 The expression tree T represents a data member initialization
5747 in a (constexpr) constructor definition. Build a pairing of
5748 the data member with its initializer, and prepend that pair
5749 to the existing initialization pair INITS. */
5752 build_data_member_initialization (tree t, VEC(constructor_elt,gc) **vec)
5755 if (TREE_CODE (t) == CLEANUP_POINT_EXPR)
5756 t = TREE_OPERAND (t, 0);
5757 if (TREE_CODE (t) == EXPR_STMT)
5758 t = TREE_OPERAND (t, 0);
5759 if (t == error_mark_node)
5761 if (TREE_CODE (t) == STATEMENT_LIST)
5763 tree_stmt_iterator i;
5764 for (i = tsi_start (t); !tsi_end_p (i); tsi_next (&i))
5766 if (! build_data_member_initialization (tsi_stmt (i), vec))
5771 if (TREE_CODE (t) == CLEANUP_STMT)
5773 /* We can't see a CLEANUP_STMT in a constructor for a literal class,
5774 but we can in a constexpr constructor for a non-literal class. Just
5775 ignore it; either all the initialization will be constant, in which
5776 case the cleanup can't run, or it can't be constexpr.
5777 Still recurse into CLEANUP_BODY. */
5778 return build_data_member_initialization (CLEANUP_BODY (t), vec);
5780 if (TREE_CODE (t) == CONVERT_EXPR)
5781 t = TREE_OPERAND (t, 0);
5782 if (TREE_CODE (t) == INIT_EXPR
5783 || TREE_CODE (t) == MODIFY_EXPR)
5785 member = TREE_OPERAND (t, 0);
5786 init = unshare_expr (TREE_OPERAND (t, 1));
5790 gcc_assert (TREE_CODE (t) == CALL_EXPR);
5791 member = CALL_EXPR_ARG (t, 0);
5792 /* We don't use build_cplus_new here because it complains about
5793 abstract bases. Leaving the call unwrapped means that it has the
5794 wrong type, but cxx_eval_constant_expression doesn't care. */
5795 init = unshare_expr (t);
5797 if (TREE_CODE (member) == INDIRECT_REF)
5798 member = TREE_OPERAND (member, 0);
5799 if (TREE_CODE (member) == NOP_EXPR)
5803 if (TREE_CODE (op) == ADDR_EXPR)
5805 gcc_assert (same_type_ignoring_top_level_qualifiers_p
5806 (TREE_TYPE (TREE_TYPE (op)),
5807 TREE_TYPE (TREE_TYPE (member))));
5808 /* Initializing a cv-qualified member; we need to look through
5812 else if (op == current_class_ptr
5813 && (same_type_ignoring_top_level_qualifiers_p
5814 (TREE_TYPE (TREE_TYPE (member)),
5815 current_class_type)))
5816 /* Delegating constructor. */
5820 /* This is an initializer for an empty base; keep it for now so
5821 we can check it in cxx_eval_bare_aggregate. */
5822 gcc_assert (is_empty_class (TREE_TYPE (TREE_TYPE (member))));
5825 if (TREE_CODE (member) == ADDR_EXPR)
5826 member = TREE_OPERAND (member, 0);
5827 if (TREE_CODE (member) == COMPONENT_REF
5828 /* If we're initializing a member of a subaggregate, it's a vtable
5829 pointer. Leave it as COMPONENT_REF so we remember the path to get
5831 && TREE_CODE (TREE_OPERAND (member, 0)) != COMPONENT_REF)
5832 member = TREE_OPERAND (member, 1);
5833 CONSTRUCTOR_APPEND_ELT (*vec, member, init);
5837 /* Make sure that there are no statements after LAST in the constructor
5838 body represented by LIST. */
5841 check_constexpr_ctor_body (tree last, tree list)
5844 if (TREE_CODE (list) == STATEMENT_LIST)
5846 tree_stmt_iterator i = tsi_last (list);
5847 for (; !tsi_end_p (i); tsi_prev (&i))
5849 tree t = tsi_stmt (i);
5852 if (TREE_CODE (t) == BIND_EXPR)
5854 if (!check_constexpr_ctor_body (last, BIND_EXPR_BODY (t)))
5859 /* We currently allow typedefs and static_assert.
5860 FIXME allow them in the standard, too. */
5861 if (TREE_CODE (t) != STATIC_ASSERT)
5868 else if (list != last
5869 && TREE_CODE (list) != STATIC_ASSERT)
5873 error ("constexpr constructor does not have empty body");
5874 DECL_DECLARED_CONSTEXPR_P (current_function_decl) = false;
5879 /* VEC is a vector of constructor elements built up for the base and member
5880 initializers of a constructor for TYPE. They need to be in increasing
5881 offset order, which they might not be yet if TYPE has a primary base
5882 which is not first in the base-clause. */
5884 static VEC(constructor_elt,gc) *
5885 sort_constexpr_mem_initializers (tree type, VEC(constructor_elt,gc) *vec)
5887 tree pri = CLASSTYPE_PRIMARY_BINFO (type);
5888 constructor_elt elt;
5891 if (pri == NULL_TREE
5892 || pri == BINFO_BASE_BINFO (TYPE_BINFO (type), 0))
5895 /* Find the element for the primary base and move it to the beginning of
5897 pri = BINFO_TYPE (pri);
5899 if (TREE_TYPE (VEC_index (constructor_elt, vec, i)->index) == pri)
5902 elt = *VEC_index (constructor_elt, vec, i);
5904 VEC_replace (constructor_elt, vec, i,
5905 VEC_index (constructor_elt, vec, i-1));
5906 VEC_replace (constructor_elt, vec, 0, &elt);
5910 /* Build compile-time evalable representations of member-initializer list
5911 for a constexpr constructor. */
5914 build_constexpr_constructor_member_initializers (tree type, tree body)
5916 VEC(constructor_elt,gc) *vec = NULL;
5918 if (TREE_CODE (body) == MUST_NOT_THROW_EXPR
5919 || TREE_CODE (body) == EH_SPEC_BLOCK)
5920 body = TREE_OPERAND (body, 0);
5921 if (TREE_CODE (body) == STATEMENT_LIST)
5922 body = STATEMENT_LIST_HEAD (body)->stmt;
5923 body = BIND_EXPR_BODY (body);
5924 if (TREE_CODE (body) == CLEANUP_POINT_EXPR)
5926 body = TREE_OPERAND (body, 0);
5927 if (TREE_CODE (body) == EXPR_STMT)
5928 body = TREE_OPERAND (body, 0);
5929 if (TREE_CODE (body) == INIT_EXPR
5930 && (same_type_ignoring_top_level_qualifiers_p
5931 (TREE_TYPE (TREE_OPERAND (body, 0)),
5932 current_class_type)))
5935 return TREE_OPERAND (body, 1);
5937 ok = build_data_member_initialization (body, &vec);
5939 else if (TREE_CODE (body) == STATEMENT_LIST)
5941 tree_stmt_iterator i;
5942 for (i = tsi_start (body); !tsi_end_p (i); tsi_next (&i))
5944 ok = build_data_member_initialization (tsi_stmt (i), &vec);
5949 else if (EXPR_P (body))
5950 ok = build_data_member_initialization (body, &vec);
5952 gcc_assert (errorcount > 0);
5955 if (VEC_length (constructor_elt, vec) > 0)
5957 /* In a delegating constructor, return the target. */
5958 constructor_elt *ce = VEC_index (constructor_elt, vec, 0);
5959 if (ce->index == current_class_ptr)
5962 VEC_free (constructor_elt, gc, vec);
5966 vec = sort_constexpr_mem_initializers (type, vec);
5967 return build_constructor (type, vec);
5970 return error_mark_node;
5973 /* Subroutine of register_constexpr_fundef. BODY is the body of a function
5974 declared to be constexpr, or a sub-statement thereof. Returns the
5975 return value if suitable, error_mark_node for a statement not allowed in
5976 a constexpr function, or NULL_TREE if no return value was found. */
5979 constexpr_fn_retval (tree body)
5981 switch (TREE_CODE (body))
5983 case STATEMENT_LIST:
5985 tree_stmt_iterator i;
5986 tree expr = NULL_TREE;
5987 for (i = tsi_start (body); !tsi_end_p (i); tsi_next (&i))
5989 tree s = constexpr_fn_retval (tsi_stmt (i));
5990 if (s == error_mark_node)
5991 return error_mark_node;
5992 else if (s == NULL_TREE)
5993 /* Keep iterating. */;
5995 /* Multiple return statements. */
5996 return error_mark_node;
6004 return unshare_expr (TREE_OPERAND (body, 0));
6007 if (TREE_CODE (DECL_EXPR_DECL (body)) == USING_DECL)
6009 return error_mark_node;
6011 case CLEANUP_POINT_EXPR:
6012 return constexpr_fn_retval (TREE_OPERAND (body, 0));
6018 return error_mark_node;
6022 /* Subroutine of register_constexpr_fundef. BODY is the DECL_SAVED_TREE of
6023 FUN; do the necessary transformations to turn it into a single expression
6024 that we can store in the hash table. */
6027 massage_constexpr_body (tree fun, tree body)
6029 if (DECL_CONSTRUCTOR_P (fun))
6030 body = build_constexpr_constructor_member_initializers
6031 (DECL_CONTEXT (fun), body);
6034 if (TREE_CODE (body) == EH_SPEC_BLOCK)
6035 body = EH_SPEC_STMTS (body);
6036 if (TREE_CODE (body) == MUST_NOT_THROW_EXPR)
6037 body = TREE_OPERAND (body, 0);
6038 if (TREE_CODE (body) == BIND_EXPR)
6039 body = BIND_EXPR_BODY (body);
6040 body = constexpr_fn_retval (body);
6045 /* FUN is a constexpr constructor with massaged body BODY. Return true
6046 if some bases/fields are uninitialized, and complain if COMPLAIN. */
6049 cx_check_missing_mem_inits (tree fun, tree body, bool complain)
6056 if (TREE_CODE (body) != CONSTRUCTOR)
6059 nelts = CONSTRUCTOR_NELTS (body);
6060 ctype = DECL_CONTEXT (fun);
6061 field = TYPE_FIELDS (ctype);
6063 if (TREE_CODE (ctype) == UNION_TYPE)
6065 if (nelts == 0 && next_initializable_field (field))
6068 error ("%<constexpr%> constructor for union %qT must "
6069 "initialize exactly one non-static data member", ctype);
6076 for (i = 0; i <= nelts; ++i)
6083 index = CONSTRUCTOR_ELT (body, i)->index;
6084 /* Skip base and vtable inits. */
6085 if (TREE_CODE (index) != FIELD_DECL
6086 || DECL_ARTIFICIAL (index))
6089 for (; field != index; field = DECL_CHAIN (field))
6092 if (TREE_CODE (field) != FIELD_DECL
6093 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
6094 || DECL_ARTIFICIAL (field))
6096 ftype = strip_array_types (TREE_TYPE (field));
6097 if (type_has_constexpr_default_constructor (ftype))
6099 /* It's OK to skip a member with a trivial constexpr ctor.
6100 A constexpr ctor that isn't trivial should have been
6102 gcc_checking_assert (!TYPE_HAS_COMPLEX_DFLT (ftype)
6103 || errorcount != 0);
6108 error ("uninitialized member %qD in %<constexpr%> constructor",
6112 if (field == NULL_TREE)
6114 field = DECL_CHAIN (field);
6120 /* We are processing the definition of the constexpr function FUN.
6121 Check that its BODY fulfills the propriate requirements and
6122 enter it in the constexpr function definition table.
6123 For constructor BODY is actually the TREE_LIST of the
6124 member-initializer list. */
6127 register_constexpr_fundef (tree fun, tree body)
6129 constexpr_fundef entry;
6130 constexpr_fundef **slot;
6132 if (!is_valid_constexpr_fn (fun, !DECL_GENERATED_P (fun)))
6135 body = massage_constexpr_body (fun, body);
6136 if (body == NULL_TREE || body == error_mark_node)
6138 if (!DECL_CONSTRUCTOR_P (fun))
6139 error ("body of constexpr function %qD not a return-statement", fun);
6143 if (!potential_rvalue_constant_expression (body))
6145 if (!DECL_GENERATED_P (fun))
6146 require_potential_rvalue_constant_expression (body);
6150 if (DECL_CONSTRUCTOR_P (fun)
6151 && cx_check_missing_mem_inits (fun, body, !DECL_GENERATED_P (fun)))
6154 /* Create the constexpr function table if necessary. */
6155 if (constexpr_fundef_table == NULL)
6156 constexpr_fundef_table = htab_create_ggc (101,
6157 constexpr_fundef_hash,
6158 constexpr_fundef_equal,
6162 slot = (constexpr_fundef **)
6163 htab_find_slot (constexpr_fundef_table, &entry, INSERT);
6165 gcc_assert (*slot == NULL);
6166 *slot = ggc_alloc_constexpr_fundef ();
6172 /* FUN is a non-constexpr function called in a context that requires a
6173 constant expression. If it comes from a constexpr template, explain why
6174 the instantiation isn't constexpr. */
6177 explain_invalid_constexpr_fn (tree fun)
6179 static struct pointer_set_t *diagnosed;
6181 location_t save_loc;
6182 /* Only diagnose defaulted functions or instantiations. */
6183 if (!DECL_DEFAULTED_FN (fun)
6184 && !is_instantiation_of_constexpr (fun))
6186 if (diagnosed == NULL)
6187 diagnosed = pointer_set_create ();
6188 if (pointer_set_insert (diagnosed, fun) != 0)
6189 /* Already explained. */
6192 save_loc = input_location;
6193 input_location = DECL_SOURCE_LOCATION (fun);
6194 inform (0, "%q+D is not usable as a constexpr function because:", fun);
6195 /* First check the declaration. */
6196 if (is_valid_constexpr_fn (fun, true))
6198 /* Then if it's OK, the body. */
6199 if (DECL_DEFAULTED_FN (fun))
6200 explain_implicit_non_constexpr (fun);
6203 body = massage_constexpr_body (fun, DECL_SAVED_TREE (fun));
6204 require_potential_rvalue_constant_expression (body);
6205 if (DECL_CONSTRUCTOR_P (fun))
6206 cx_check_missing_mem_inits (fun, body, true);
6209 input_location = save_loc;
6212 /* Objects of this type represent calls to constexpr functions
6213 along with the bindings of parameters to their arguments, for
6214 the purpose of compile time evaluation. */
6216 typedef struct GTY(()) constexpr_call {
6217 /* Description of the constexpr function definition. */
6218 constexpr_fundef *fundef;
6219 /* Parameter bindings enironment. A TREE_LIST where each TREE_PURPOSE
6220 is a parameter _DECL and the TREE_VALUE is the value of the parameter.
6221 Note: This arrangement is made to accomodate the use of
6222 iterative_hash_template_arg (see pt.c). If you change this
6223 representation, also change the hash calculation in
6224 cxx_eval_call_expression. */
6226 /* Result of the call.
6227 NULL means the call is being evaluated.
6228 error_mark_node means that the evaluation was erroneous;
6229 otherwise, the actuall value of the call. */
6231 /* The hash of this call; we remember it here to avoid having to
6232 recalculate it when expanding the hash table. */
6236 /* A table of all constexpr calls that have been evaluated by the
6237 compiler in this translation unit. */
6239 static GTY ((param_is (constexpr_call))) htab_t constexpr_call_table;
6241 static tree cxx_eval_constant_expression (const constexpr_call *, tree,
6242 bool, bool, bool *);
6244 /* Compute a hash value for a constexpr call representation. */
6247 constexpr_call_hash (const void *p)
6249 const constexpr_call *info = (const constexpr_call *) p;
6253 /* Return 1 if the objects pointed to by P and Q represent calls
6254 to the same constexpr function with the same arguments.
6255 Otherwise, return 0. */
6258 constexpr_call_equal (const void *p, const void *q)
6260 const constexpr_call *lhs = (const constexpr_call *) p;
6261 const constexpr_call *rhs = (const constexpr_call *) q;
6266 if (!constexpr_fundef_equal (lhs->fundef, rhs->fundef))
6268 lhs_bindings = lhs->bindings;
6269 rhs_bindings = rhs->bindings;
6270 while (lhs_bindings != NULL && rhs_bindings != NULL)
6272 tree lhs_arg = TREE_VALUE (lhs_bindings);
6273 tree rhs_arg = TREE_VALUE (rhs_bindings);
6274 gcc_assert (TREE_TYPE (lhs_arg) == TREE_TYPE (rhs_arg));
6275 if (!cp_tree_equal (lhs_arg, rhs_arg))
6277 lhs_bindings = TREE_CHAIN (lhs_bindings);
6278 rhs_bindings = TREE_CHAIN (rhs_bindings);
6280 return lhs_bindings == rhs_bindings;
6283 /* Initialize the constexpr call table, if needed. */
6286 maybe_initialize_constexpr_call_table (void)
6288 if (constexpr_call_table == NULL)
6289 constexpr_call_table = htab_create_ggc (101,
6290 constexpr_call_hash,
6291 constexpr_call_equal,
6295 /* Return true if T designates the implied `this' parameter. */
6298 is_this_parameter (tree t)
6300 return t == current_class_ptr;
6303 /* We have an expression tree T that represents a call, either CALL_EXPR
6304 or AGGR_INIT_EXPR. If the call is lexically to a named function,
6305 retrun the _DECL for that function. */
6308 get_function_named_in_call (tree t)
6311 switch (TREE_CODE (t))
6314 fun = CALL_EXPR_FN (t);
6317 case AGGR_INIT_EXPR:
6318 fun = AGGR_INIT_EXPR_FN (t);
6325 if (TREE_CODE (fun) == ADDR_EXPR
6326 && TREE_CODE (TREE_OPERAND (fun, 0)) == FUNCTION_DECL)
6327 fun = TREE_OPERAND (fun, 0);
6331 /* We have an expression tree T that represents a call, either CALL_EXPR
6332 or AGGR_INIT_EXPR. Return the Nth argument. */
6335 get_nth_callarg (tree t, int n)
6337 switch (TREE_CODE (t))
6340 return CALL_EXPR_ARG (t, n);
6342 case AGGR_INIT_EXPR:
6343 return AGGR_INIT_EXPR_ARG (t, n);
6351 /* Look up the binding of the function parameter T in a constexpr
6352 function call context CALL. */
6355 lookup_parameter_binding (const constexpr_call *call, tree t)
6357 tree b = purpose_member (t, call->bindings);
6358 return TREE_VALUE (b);
6361 /* Attempt to evaluate T which represents a call to a builtin function.
6362 We assume here that all builtin functions evaluate to scalar types
6363 represented by _CST nodes. */
6366 cxx_eval_builtin_function_call (const constexpr_call *call, tree t,
6367 bool allow_non_constant, bool addr,
6368 bool *non_constant_p)
6370 const int nargs = call_expr_nargs (t);
6371 tree *args = (tree *) alloca (nargs * sizeof (tree));
6374 for (i = 0; i < nargs; ++i)
6376 args[i] = cxx_eval_constant_expression (call, CALL_EXPR_ARG (t, i),
6377 allow_non_constant, addr,
6379 if (allow_non_constant && *non_constant_p)
6382 if (*non_constant_p)
6384 new_call = build_call_array_loc (EXPR_LOCATION (t), TREE_TYPE (t),
6385 CALL_EXPR_FN (t), nargs, args);
6386 return fold (new_call);
6389 /* TEMP is the constant value of a temporary object of type TYPE. Adjust
6390 the type of the value to match. */
6393 adjust_temp_type (tree type, tree temp)
6395 if (TREE_TYPE (temp) == type)
6397 /* Avoid wrapping an aggregate value in a NOP_EXPR. */
6398 if (TREE_CODE (temp) == CONSTRUCTOR)
6399 return build_constructor (type, CONSTRUCTOR_ELTS (temp));
6400 gcc_assert (SCALAR_TYPE_P (type));
6401 return cp_fold_convert (type, temp);
6404 /* Subroutine of cxx_eval_call_expression.
6405 We are processing a call expression (either CALL_EXPR or
6406 AGGR_INIT_EXPR) in the call context of OLD_CALL. Evaluate
6407 all arguments and bind their values to correspondings
6408 parameters, making up the NEW_CALL context. */
6411 cxx_bind_parameters_in_call (const constexpr_call *old_call, tree t,
6412 constexpr_call *new_call,
6413 bool allow_non_constant,
6414 bool *non_constant_p)
6416 const int nargs = call_expr_nargs (t);
6417 tree fun = new_call->fundef->decl;
6418 tree parms = DECL_ARGUMENTS (fun);
6420 for (i = 0; i < nargs; ++i)
6423 tree type = parms ? TREE_TYPE (parms) : void_type_node;
6424 /* For member function, the first argument is a pointer to the implied
6425 object. And for an object contruction, don't bind `this' before
6426 it is fully constructed. */
6427 if (i == 0 && DECL_CONSTRUCTOR_P (fun))
6429 x = get_nth_callarg (t, i);
6430 arg = cxx_eval_constant_expression (old_call, x, allow_non_constant,
6431 TREE_CODE (type) == REFERENCE_TYPE,
6433 /* Don't VERIFY_CONSTANT here. */
6434 if (*non_constant_p && allow_non_constant)
6436 /* Just discard ellipsis args after checking their constantitude. */
6439 if (*non_constant_p)
6440 /* Don't try to adjust the type of non-constant args. */
6443 /* Make sure the binding has the same type as the parm. */
6444 if (TREE_CODE (type) != REFERENCE_TYPE)
6445 arg = adjust_temp_type (type, arg);
6446 new_call->bindings = tree_cons (parms, arg, new_call->bindings);
6448 parms = TREE_CHAIN (parms);
6452 /* Variables and functions to manage constexpr call expansion context.
6453 These do not need to be marked for PCH or GC. */
6455 /* FIXME remember and print actual constant arguments. */
6456 static VEC(tree,heap) *call_stack = NULL;
6457 static int call_stack_tick;
6458 static int last_cx_error_tick;
6461 push_cx_call_context (tree call)
6464 if (!EXPR_HAS_LOCATION (call))
6465 SET_EXPR_LOCATION (call, input_location);
6466 VEC_safe_push (tree, heap, call_stack, call);
6467 if (VEC_length (tree, call_stack) > (unsigned) max_constexpr_depth)
6473 pop_cx_call_context (void)
6476 VEC_pop (tree, call_stack);
6480 cx_error_context (void)
6482 VEC(tree,heap) *r = NULL;
6483 if (call_stack_tick != last_cx_error_tick
6484 && !VEC_empty (tree, call_stack))
6486 last_cx_error_tick = call_stack_tick;
6490 /* Subroutine of cxx_eval_constant_expression.
6491 Evaluate the call expression tree T in the context of OLD_CALL expression
6495 cxx_eval_call_expression (const constexpr_call *old_call, tree t,
6496 bool allow_non_constant, bool addr,
6497 bool *non_constant_p)
6499 location_t loc = EXPR_LOC_OR_HERE (t);
6500 tree fun = get_function_named_in_call (t);
6502 constexpr_call new_call = { NULL, NULL, NULL, 0 };
6503 constexpr_call **slot;
6504 constexpr_call *entry;
6507 if (TREE_CODE (fun) != FUNCTION_DECL)
6509 /* Might be a constexpr function pointer. */
6510 fun = cxx_eval_constant_expression (old_call, fun, allow_non_constant,
6511 /*addr*/false, non_constant_p);
6512 if (TREE_CODE (fun) == ADDR_EXPR)
6513 fun = TREE_OPERAND (fun, 0);
6515 if (TREE_CODE (fun) != FUNCTION_DECL)
6517 if (!allow_non_constant && !*non_constant_p)
6518 error_at (loc, "expression %qE does not designate a constexpr "
6520 *non_constant_p = true;
6523 if (DECL_CLONED_FUNCTION_P (fun))
6524 fun = DECL_CLONED_FUNCTION (fun);
6525 if (is_builtin_fn (fun))
6526 return cxx_eval_builtin_function_call (old_call, t, allow_non_constant,
6527 addr, non_constant_p);
6528 if (!DECL_DECLARED_CONSTEXPR_P (fun))
6530 if (!allow_non_constant)
6532 error_at (loc, "call to non-constexpr function %qD", fun);
6533 explain_invalid_constexpr_fn (fun);
6535 *non_constant_p = true;
6539 /* Shortcut trivial copy constructor/op=. */
6540 if (call_expr_nargs (t) == 2 && trivial_fn_p (fun))
6542 tree arg = convert_from_reference (get_nth_callarg (t, 1));
6543 return cxx_eval_constant_expression (old_call, arg, allow_non_constant,
6544 addr, non_constant_p);
6547 /* If in direct recursive call, optimize definition search. */
6548 if (old_call != NULL && old_call->fundef->decl == fun)
6549 new_call.fundef = old_call->fundef;
6552 new_call.fundef = retrieve_constexpr_fundef (fun);
6553 if (new_call.fundef == NULL || new_call.fundef->body == NULL)
6555 if (!allow_non_constant)
6557 if (DECL_INITIAL (fun))
6559 /* The definition of fun was somehow unsuitable. */
6560 error_at (loc, "%qD called in a constant expression", fun);
6561 explain_invalid_constexpr_fn (fun);
6564 error_at (loc, "%qD used before its definition", fun);
6566 *non_constant_p = true;
6570 cxx_bind_parameters_in_call (old_call, t, &new_call,
6571 allow_non_constant, non_constant_p);
6572 if (*non_constant_p)
6575 depth_ok = push_cx_call_context (t);
6578 = iterative_hash_template_arg (new_call.bindings,
6579 constexpr_fundef_hash (new_call.fundef));
6581 /* If we have seen this call before, we are done. */
6582 maybe_initialize_constexpr_call_table ();
6583 slot = (constexpr_call **)
6584 htab_find_slot (constexpr_call_table, &new_call, INSERT);
6588 /* We need to keep a pointer to the entry, not just the slot, as the
6589 slot can move in the call to cxx_eval_builtin_function_call. */
6590 *slot = entry = ggc_alloc_constexpr_call ();
6593 /* Calls which are in progress have their result set to NULL
6594 so that we can detect circular dependencies. */
6595 else if (entry->result == NULL)
6597 if (!allow_non_constant)
6598 error ("call has circular dependency");
6599 *non_constant_p = true;
6600 entry->result = result = error_mark_node;
6605 if (!allow_non_constant)
6606 error ("constexpr evaluation depth exceeds maximum of %d (use "
6607 "-fconstexpr-depth= to increase the maximum)",
6608 max_constexpr_depth);
6609 *non_constant_p = true;
6610 entry->result = result = error_mark_node;
6614 result = entry->result;
6615 if (!result || result == error_mark_node)
6616 result = (cxx_eval_constant_expression
6617 (&new_call, new_call.fundef->body,
6618 allow_non_constant, addr,
6620 if (result == error_mark_node)
6621 *non_constant_p = true;
6622 if (*non_constant_p)
6623 entry->result = result = error_mark_node;
6626 /* If this was a call to initialize an object, set the type of
6627 the CONSTRUCTOR to the type of that object. */
6628 if (DECL_CONSTRUCTOR_P (fun))
6630 tree ob_arg = get_nth_callarg (t, 0);
6631 STRIP_NOPS (ob_arg);
6632 gcc_assert (TREE_CODE (TREE_TYPE (ob_arg)) == POINTER_TYPE
6633 && CLASS_TYPE_P (TREE_TYPE (TREE_TYPE (ob_arg))));
6634 result = adjust_temp_type (TREE_TYPE (TREE_TYPE (ob_arg)),
6637 entry->result = result;
6641 pop_cx_call_context ();
6642 return unshare_expr (result);
6645 /* FIXME speed this up, it's taking 16% of compile time on sieve testcase. */
6648 reduced_constant_expression_p (tree t)
6650 if (TREE_OVERFLOW_P (t))
6651 /* Integer overflow makes this not a constant expression. */
6653 /* FIXME are we calling this too much? */
6654 return initializer_constant_valid_p (t, TREE_TYPE (t)) != NULL_TREE;
6657 /* Some expressions may have constant operands but are not constant
6658 themselves, such as 1/0. Call this function (or rather, the macro
6659 following it) to check for that condition.
6661 We only call this in places that require an arithmetic constant, not in
6662 places where we might have a non-constant expression that can be a
6663 component of a constant expression, such as the address of a constexpr
6664 variable that might be dereferenced later. */
6667 verify_constant (tree t, bool allow_non_constant, bool *non_constant_p)
6669 if (!*non_constant_p && !reduced_constant_expression_p (t))
6671 if (!allow_non_constant)
6673 /* If T was already folded to a _CST with TREE_OVERFLOW set,
6674 printing the folded constant isn't helpful. */
6675 if (TREE_OVERFLOW_P (t))
6677 permerror (input_location, "overflow in constant expression");
6678 /* If we're being permissive (and are in an enforcing
6679 context), consider this constant. */
6680 if (flag_permissive)
6684 error ("%q+E is not a constant expression", t);
6686 *non_constant_p = true;
6688 return *non_constant_p;
6690 #define VERIFY_CONSTANT(X) \
6692 if (verify_constant ((X), allow_non_constant, non_constant_p)) \
6696 /* Subroutine of cxx_eval_constant_expression.
6697 Attempt to reduce the unary expression tree T to a compile time value.
6698 If successful, return the value. Otherwise issue a diagnostic
6699 and return error_mark_node. */
6702 cxx_eval_unary_expression (const constexpr_call *call, tree t,
6703 bool allow_non_constant, bool addr,
6704 bool *non_constant_p)
6707 tree orig_arg = TREE_OPERAND (t, 0);
6708 tree arg = cxx_eval_constant_expression (call, orig_arg, allow_non_constant,
6709 addr, non_constant_p);
6710 VERIFY_CONSTANT (arg);
6711 if (arg == orig_arg)
6713 r = fold_build1 (TREE_CODE (t), TREE_TYPE (t), arg);
6714 VERIFY_CONSTANT (r);
6718 /* Subroutine of cxx_eval_constant_expression.
6719 Like cxx_eval_unary_expression, except for binary expressions. */
6722 cxx_eval_binary_expression (const constexpr_call *call, tree t,
6723 bool allow_non_constant, bool addr,
6724 bool *non_constant_p)
6727 tree orig_lhs = TREE_OPERAND (t, 0);
6728 tree orig_rhs = TREE_OPERAND (t, 1);
6730 lhs = cxx_eval_constant_expression (call, orig_lhs,
6731 allow_non_constant, addr,
6733 VERIFY_CONSTANT (lhs);
6734 rhs = cxx_eval_constant_expression (call, orig_rhs,
6735 allow_non_constant, addr,
6737 VERIFY_CONSTANT (rhs);
6738 if (lhs == orig_lhs && rhs == orig_rhs)
6740 r = fold_build2 (TREE_CODE (t), TREE_TYPE (t), lhs, rhs);
6741 VERIFY_CONSTANT (r);
6745 /* Subroutine of cxx_eval_constant_expression.
6746 Attempt to evaluate condition expressions. Dead branches are not
6750 cxx_eval_conditional_expression (const constexpr_call *call, tree t,
6751 bool allow_non_constant, bool addr,
6752 bool *non_constant_p)
6754 tree val = cxx_eval_constant_expression (call, TREE_OPERAND (t, 0),
6755 allow_non_constant, addr,
6757 VERIFY_CONSTANT (val);
6758 /* Don't VERIFY_CONSTANT the other operands. */
6759 if (integer_zerop (val))
6760 return cxx_eval_constant_expression (call, TREE_OPERAND (t, 2),
6761 allow_non_constant, addr,
6763 return cxx_eval_constant_expression (call, TREE_OPERAND (t, 1),
6764 allow_non_constant, addr,
6768 /* Subroutine of cxx_eval_constant_expression.
6769 Attempt to reduce a reference to an array slot. */
6772 cxx_eval_array_reference (const constexpr_call *call, tree t,
6773 bool allow_non_constant, bool addr,
6774 bool *non_constant_p)
6776 tree oldary = TREE_OPERAND (t, 0);
6777 tree ary = cxx_eval_constant_expression (call, oldary,
6778 allow_non_constant, addr,
6783 unsigned len, elem_nchars = 1;
6784 if (*non_constant_p)
6786 oldidx = TREE_OPERAND (t, 1);
6787 index = cxx_eval_constant_expression (call, oldidx,
6788 allow_non_constant, false,
6790 VERIFY_CONSTANT (index);
6791 if (addr && ary == oldary && index == oldidx)
6794 return build4 (ARRAY_REF, TREE_TYPE (t), ary, index, NULL, NULL);
6795 elem_type = TREE_TYPE (TREE_TYPE (ary));
6796 if (TREE_CODE (ary) == CONSTRUCTOR)
6797 len = CONSTRUCTOR_NELTS (ary);
6798 else if (TREE_CODE (ary) == STRING_CST)
6800 elem_nchars = (TYPE_PRECISION (elem_type)
6801 / TYPE_PRECISION (char_type_node));
6802 len = (unsigned) TREE_STRING_LENGTH (ary) / elem_nchars;
6806 /* We can't do anything with other tree codes, so use
6807 VERIFY_CONSTANT to complain and fail. */
6808 VERIFY_CONSTANT (ary);
6811 if (compare_tree_int (index, len) >= 0)
6813 if (tree_int_cst_lt (index, array_type_nelts_top (TREE_TYPE (ary))))
6815 /* If it's within the array bounds but doesn't have an explicit
6816 initializer, it's value-initialized. */
6817 tree val = build_value_init (elem_type, tf_warning_or_error);
6818 return cxx_eval_constant_expression (call, val,
6819 allow_non_constant, addr,
6823 if (!allow_non_constant)
6824 error ("array subscript out of bound");
6825 *non_constant_p = true;
6828 i = tree_low_cst (index, 0);
6829 if (TREE_CODE (ary) == CONSTRUCTOR)
6830 return VEC_index (constructor_elt, CONSTRUCTOR_ELTS (ary), i)->value;
6831 else if (elem_nchars == 1)
6832 return build_int_cst (cv_unqualified (TREE_TYPE (TREE_TYPE (ary))),
6833 TREE_STRING_POINTER (ary)[i]);
6836 tree type = cv_unqualified (TREE_TYPE (TREE_TYPE (ary)));
6837 return native_interpret_expr (type, (const unsigned char *)
6838 TREE_STRING_POINTER (ary)
6839 + i * elem_nchars, elem_nchars);
6841 /* Don't VERIFY_CONSTANT here. */
6844 /* Subroutine of cxx_eval_constant_expression.
6845 Attempt to reduce a field access of a value of class type. */
6848 cxx_eval_component_reference (const constexpr_call *call, tree t,
6849 bool allow_non_constant, bool addr,
6850 bool *non_constant_p)
6852 unsigned HOST_WIDE_INT i;
6855 tree part = TREE_OPERAND (t, 1);
6856 tree orig_whole = TREE_OPERAND (t, 0);
6857 tree whole = cxx_eval_constant_expression (call, orig_whole,
6858 allow_non_constant, addr,
6860 if (whole == orig_whole)
6863 return fold_build3 (COMPONENT_REF, TREE_TYPE (t),
6864 whole, part, NULL_TREE);
6865 /* Don't VERIFY_CONSTANT here; we only want to check that we got a
6867 if (!*non_constant_p && TREE_CODE (whole) != CONSTRUCTOR)
6869 if (!allow_non_constant)
6870 error ("%qE is not a constant expression", orig_whole);
6871 *non_constant_p = true;
6873 if (DECL_MUTABLE_P (part))
6875 if (!allow_non_constant)
6876 error ("mutable %qD is not usable in a constant expression", part);
6877 *non_constant_p = true;
6879 if (*non_constant_p)
6881 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (whole), i, field, value)
6886 if (TREE_CODE (TREE_TYPE (whole)) == UNION_TYPE
6887 && CONSTRUCTOR_NELTS (whole) > 0)
6889 /* DR 1188 says we don't have to deal with this. */
6890 if (!allow_non_constant)
6891 error ("accessing %qD member instead of initialized %qD member in "
6892 "constant expression", part, CONSTRUCTOR_ELT (whole, 0)->index);
6893 *non_constant_p = true;
6897 /* If there's no explicit init for this field, it's value-initialized. */
6898 value = build_value_init (TREE_TYPE (t), tf_warning_or_error);
6899 return cxx_eval_constant_expression (call, value,
6900 allow_non_constant, addr,
6904 /* Subroutine of cxx_eval_constant_expression.
6905 Attempt to reduce a field access of a value of class type that is
6906 expressed as a BIT_FIELD_REF. */
6909 cxx_eval_bit_field_ref (const constexpr_call *call, tree t,
6910 bool allow_non_constant, bool addr,
6911 bool *non_constant_p)
6913 tree orig_whole = TREE_OPERAND (t, 0);
6914 tree retval, fldval, utype, mask;
6915 bool fld_seen = false;
6916 HOST_WIDE_INT istart, isize;
6917 tree whole = cxx_eval_constant_expression (call, orig_whole,
6918 allow_non_constant, addr,
6920 tree start, field, value;
6921 unsigned HOST_WIDE_INT i;
6923 if (whole == orig_whole)
6925 /* Don't VERIFY_CONSTANT here; we only want to check that we got a
6927 if (!*non_constant_p && TREE_CODE (whole) != CONSTRUCTOR)
6929 if (!allow_non_constant)
6930 error ("%qE is not a constant expression", orig_whole);
6931 *non_constant_p = true;
6933 if (*non_constant_p)
6936 start = TREE_OPERAND (t, 2);
6937 istart = tree_low_cst (start, 0);
6938 isize = tree_low_cst (TREE_OPERAND (t, 1), 0);
6939 utype = TREE_TYPE (t);
6940 if (!TYPE_UNSIGNED (utype))
6941 utype = build_nonstandard_integer_type (TYPE_PRECISION (utype), 1);
6942 retval = build_int_cst (utype, 0);
6943 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (whole), i, field, value)
6945 tree bitpos = bit_position (field);
6946 if (bitpos == start && DECL_SIZE (field) == TREE_OPERAND (t, 1))
6948 if (TREE_CODE (TREE_TYPE (field)) == INTEGER_TYPE
6949 && TREE_CODE (value) == INTEGER_CST
6950 && host_integerp (bitpos, 0)
6951 && host_integerp (DECL_SIZE (field), 0))
6953 HOST_WIDE_INT bit = tree_low_cst (bitpos, 0);
6954 HOST_WIDE_INT sz = tree_low_cst (DECL_SIZE (field), 0);
6955 HOST_WIDE_INT shift;
6956 if (bit >= istart && bit + sz <= istart + isize)
6958 fldval = fold_convert (utype, value);
6959 mask = build_int_cst_type (utype, -1);
6960 mask = fold_build2 (LSHIFT_EXPR, utype, mask,
6961 size_int (TYPE_PRECISION (utype) - sz));
6962 mask = fold_build2 (RSHIFT_EXPR, utype, mask,
6963 size_int (TYPE_PRECISION (utype) - sz));
6964 fldval = fold_build2 (BIT_AND_EXPR, utype, fldval, mask);
6965 shift = bit - istart;
6966 if (BYTES_BIG_ENDIAN)
6967 shift = TYPE_PRECISION (utype) - shift - sz;
6968 fldval = fold_build2 (LSHIFT_EXPR, utype, fldval,
6970 retval = fold_build2 (BIT_IOR_EXPR, utype, retval, fldval);
6976 return fold_convert (TREE_TYPE (t), retval);
6978 return error_mark_node;
6981 /* Subroutine of cxx_eval_constant_expression.
6982 Evaluate a short-circuited logical expression T in the context
6983 of a given constexpr CALL. BAILOUT_VALUE is the value for
6984 early return. CONTINUE_VALUE is used here purely for
6985 sanity check purposes. */
6988 cxx_eval_logical_expression (const constexpr_call *call, tree t,
6989 tree bailout_value, tree continue_value,
6990 bool allow_non_constant, bool addr,
6991 bool *non_constant_p)
6994 tree lhs = cxx_eval_constant_expression (call, TREE_OPERAND (t, 0),
6995 allow_non_constant, addr,
6997 VERIFY_CONSTANT (lhs);
6998 if (tree_int_cst_equal (lhs, bailout_value))
7000 gcc_assert (tree_int_cst_equal (lhs, continue_value));
7001 r = cxx_eval_constant_expression (call, TREE_OPERAND (t, 1),
7002 allow_non_constant, addr, non_constant_p);
7003 VERIFY_CONSTANT (r);
7007 /* REF is a COMPONENT_REF designating a particular field. V is a vector of
7008 CONSTRUCTOR elements to initialize (part of) an object containing that
7009 field. Return a pointer to the constructor_elt corresponding to the
7010 initialization of the field. */
7012 static constructor_elt *
7013 base_field_constructor_elt (VEC(constructor_elt,gc) *v, tree ref)
7015 tree aggr = TREE_OPERAND (ref, 0);
7016 tree field = TREE_OPERAND (ref, 1);
7018 constructor_elt *ce;
7020 gcc_assert (TREE_CODE (ref) == COMPONENT_REF);
7022 if (TREE_CODE (aggr) == COMPONENT_REF)
7024 constructor_elt *base_ce
7025 = base_field_constructor_elt (v, aggr);
7026 v = CONSTRUCTOR_ELTS (base_ce->value);
7029 for (i = 0; VEC_iterate (constructor_elt, v, i, ce); ++i)
7030 if (ce->index == field)
7037 /* Subroutine of cxx_eval_constant_expression.
7038 The expression tree T denotes a C-style array or a C-style
7039 aggregate. Reduce it to a constant expression. */
7042 cxx_eval_bare_aggregate (const constexpr_call *call, tree t,
7043 bool allow_non_constant, bool addr,
7044 bool *non_constant_p)
7046 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (t);
7047 VEC(constructor_elt,gc) *n = VEC_alloc (constructor_elt, gc,
7048 VEC_length (constructor_elt, v));
7049 constructor_elt *ce;
7051 bool changed = false;
7052 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (t));
7053 for (i = 0; VEC_iterate (constructor_elt, v, i, ce); ++i)
7055 tree elt = cxx_eval_constant_expression (call, ce->value,
7056 allow_non_constant, addr,
7058 /* Don't VERIFY_CONSTANT here. */
7059 if (allow_non_constant && *non_constant_p)
7061 if (elt != ce->value)
7063 if (TREE_CODE (ce->index) == COMPONENT_REF)
7065 /* This is an initialization of a vfield inside a base
7066 subaggregate that we already initialized; push this
7067 initialization into the previous initialization. */
7068 constructor_elt *inner = base_field_constructor_elt (n, ce->index);
7071 else if (TREE_CODE (ce->index) == NOP_EXPR)
7073 /* This is an initializer for an empty base; now that we've
7074 checked that it's constant, we can ignore it. */
7075 gcc_assert (is_empty_class (TREE_TYPE (TREE_TYPE (ce->index))));
7078 CONSTRUCTOR_APPEND_ELT (n, ce->index, elt);
7080 if (*non_constant_p || !changed)
7083 VEC_free (constructor_elt, gc, n);
7086 t = build_constructor (TREE_TYPE (t), n);
7087 TREE_CONSTANT (t) = true;
7091 /* Subroutine of cxx_eval_constant_expression.
7092 The expression tree T is a VEC_INIT_EXPR which denotes the desired
7093 initialization of a non-static data member of array type. Reduce it to a
7096 Note that apart from value-initialization (when VALUE_INIT is true),
7097 this is only intended to support value-initialization and the
7098 initializations done by defaulted constructors for classes with
7099 non-static data members of array type. In this case, VEC_INIT_EXPR_INIT
7100 will either be NULL_TREE for the default constructor, or a COMPONENT_REF
7101 for the copy/move constructor. */
7104 cxx_eval_vec_init_1 (const constexpr_call *call, tree atype, tree init,
7105 bool value_init, bool allow_non_constant, bool addr,
7106 bool *non_constant_p)
7108 tree elttype = TREE_TYPE (atype);
7109 int max = tree_low_cst (array_type_nelts (atype), 0);
7110 VEC(constructor_elt,gc) *n = VEC_alloc (constructor_elt, gc, max + 1);
7111 bool pre_init = false;
7114 /* For the default constructor, build up a call to the default
7115 constructor of the element type. We only need to handle class types
7116 here, as for a constructor to be constexpr, all members must be
7117 initialized, which for a defaulted default constructor means they must
7118 be of a class type with a constexpr default constructor. */
7119 if (TREE_CODE (elttype) == ARRAY_TYPE)
7120 /* We only do this at the lowest level. */;
7121 else if (value_init)
7123 init = build_value_init (elttype, tf_warning_or_error);
7124 init = cxx_eval_constant_expression
7125 (call, init, allow_non_constant, addr, non_constant_p);
7130 VEC(tree,gc) *argvec = make_tree_vector ();
7131 init = build_special_member_call (NULL_TREE, complete_ctor_identifier,
7132 &argvec, elttype, LOOKUP_NORMAL,
7133 tf_warning_or_error);
7134 release_tree_vector (argvec);
7135 init = cxx_eval_constant_expression (call, init, allow_non_constant,
7136 addr, non_constant_p);
7140 if (*non_constant_p && !allow_non_constant)
7143 for (i = 0; i <= max; ++i)
7145 tree idx = build_int_cst (size_type_node, i);
7147 if (TREE_CODE (elttype) == ARRAY_TYPE)
7149 /* A multidimensional array; recurse. */
7150 if (value_init || init == NULL_TREE)
7151 eltinit = NULL_TREE;
7153 eltinit = cp_build_array_ref (input_location, init, idx,
7154 tf_warning_or_error);
7155 eltinit = cxx_eval_vec_init_1 (call, elttype, eltinit, value_init,
7156 allow_non_constant, addr,
7161 /* Initializing an element using value or default initialization
7162 we just pre-built above. */
7166 eltinit = unshare_expr (init);
7170 /* Copying an element. */
7171 VEC(tree,gc) *argvec;
7172 gcc_assert (same_type_ignoring_top_level_qualifiers_p
7173 (atype, TREE_TYPE (init)));
7174 eltinit = cp_build_array_ref (input_location, init, idx,
7175 tf_warning_or_error);
7176 if (!real_lvalue_p (init))
7177 eltinit = move (eltinit);
7178 argvec = make_tree_vector ();
7179 VEC_quick_push (tree, argvec, eltinit);
7180 eltinit = (build_special_member_call
7181 (NULL_TREE, complete_ctor_identifier, &argvec,
7182 elttype, LOOKUP_NORMAL, tf_warning_or_error));
7183 release_tree_vector (argvec);
7184 eltinit = cxx_eval_constant_expression
7185 (call, eltinit, allow_non_constant, addr, non_constant_p);
7187 if (*non_constant_p && !allow_non_constant)
7189 CONSTRUCTOR_APPEND_ELT (n, idx, eltinit);
7192 if (!*non_constant_p)
7194 init = build_constructor (atype, n);
7195 TREE_CONSTANT (init) = true;
7200 VEC_free (constructor_elt, gc, n);
7205 cxx_eval_vec_init (const constexpr_call *call, tree t,
7206 bool allow_non_constant, bool addr,
7207 bool *non_constant_p)
7209 tree atype = TREE_TYPE (t);
7210 tree init = VEC_INIT_EXPR_INIT (t);
7211 tree r = cxx_eval_vec_init_1 (call, atype, init,
7212 VEC_INIT_EXPR_VALUE_INIT (t),
7213 allow_non_constant, addr, non_constant_p);
7214 if (*non_constant_p)
7220 /* A less strict version of fold_indirect_ref_1, which requires cv-quals to
7221 match. We want to be less strict for simple *& folding; if we have a
7222 non-const temporary that we access through a const pointer, that should
7223 work. We handle this here rather than change fold_indirect_ref_1
7224 because we're dealing with things like ADDR_EXPR of INTEGER_CST which
7225 don't really make sense outside of constant expression evaluation. Also
7226 we want to allow folding to COMPONENT_REF, which could cause trouble
7227 with TBAA in fold_indirect_ref_1.
7229 Try to keep this function synced with fold_indirect_ref_1. */
7232 cxx_fold_indirect_ref (location_t loc, tree type, tree op0, bool *empty_base)
7238 subtype = TREE_TYPE (sub);
7239 if (!POINTER_TYPE_P (subtype))
7242 if (TREE_CODE (sub) == ADDR_EXPR)
7244 tree op = TREE_OPERAND (sub, 0);
7245 tree optype = TREE_TYPE (op);
7247 /* *&CONST_DECL -> to the value of the const decl. */
7248 if (TREE_CODE (op) == CONST_DECL)
7249 return DECL_INITIAL (op);
7250 /* *&p => p; make sure to handle *&"str"[cst] here. */
7251 if (same_type_ignoring_top_level_qualifiers_p (optype, type))
7253 tree fop = fold_read_from_constant_string (op);
7259 /* *(foo *)&fooarray => fooarray[0] */
7260 else if (TREE_CODE (optype) == ARRAY_TYPE
7261 && (same_type_ignoring_top_level_qualifiers_p
7262 (type, TREE_TYPE (optype))))
7264 tree type_domain = TYPE_DOMAIN (optype);
7265 tree min_val = size_zero_node;
7266 if (type_domain && TYPE_MIN_VALUE (type_domain))
7267 min_val = TYPE_MIN_VALUE (type_domain);
7268 return build4_loc (loc, ARRAY_REF, type, op, min_val,
7269 NULL_TREE, NULL_TREE);
7271 /* *(foo *)&complexfoo => __real__ complexfoo */
7272 else if (TREE_CODE (optype) == COMPLEX_TYPE
7273 && (same_type_ignoring_top_level_qualifiers_p
7274 (type, TREE_TYPE (optype))))
7275 return fold_build1_loc (loc, REALPART_EXPR, type, op);
7276 /* *(foo *)&vectorfoo => BIT_FIELD_REF<vectorfoo,...> */
7277 else if (TREE_CODE (optype) == VECTOR_TYPE
7278 && (same_type_ignoring_top_level_qualifiers_p
7279 (type, TREE_TYPE (optype))))
7281 tree part_width = TYPE_SIZE (type);
7282 tree index = bitsize_int (0);
7283 return fold_build3_loc (loc, BIT_FIELD_REF, type, op, part_width, index);
7285 /* Also handle conversion to an empty base class, which
7286 is represented with a NOP_EXPR. */
7287 else if (is_empty_class (type)
7288 && CLASS_TYPE_P (optype)
7289 && DERIVED_FROM_P (type, optype))
7294 /* *(foo *)&struct_with_foo_field => COMPONENT_REF */
7295 else if (RECORD_OR_UNION_TYPE_P (optype))
7297 tree field = TYPE_FIELDS (optype);
7298 for (; field; field = DECL_CHAIN (field))
7299 if (TREE_CODE (field) == FIELD_DECL
7300 && integer_zerop (byte_position (field))
7301 && (same_type_ignoring_top_level_qualifiers_p
7302 (TREE_TYPE (field), type)))
7304 return fold_build3 (COMPONENT_REF, type, op, field, NULL_TREE);
7309 else if (TREE_CODE (sub) == POINTER_PLUS_EXPR
7310 && TREE_CODE (TREE_OPERAND (sub, 1)) == INTEGER_CST)
7312 tree op00 = TREE_OPERAND (sub, 0);
7313 tree op01 = TREE_OPERAND (sub, 1);
7316 if (TREE_CODE (op00) == ADDR_EXPR)
7319 op00 = TREE_OPERAND (op00, 0);
7320 op00type = TREE_TYPE (op00);
7322 /* ((foo*)&vectorfoo)[1] => BIT_FIELD_REF<vectorfoo,...> */
7323 if (TREE_CODE (op00type) == VECTOR_TYPE
7324 && (same_type_ignoring_top_level_qualifiers_p
7325 (type, TREE_TYPE (op00type))))
7327 HOST_WIDE_INT offset = tree_low_cst (op01, 0);
7328 tree part_width = TYPE_SIZE (type);
7329 unsigned HOST_WIDE_INT part_widthi = tree_low_cst (part_width, 0)/BITS_PER_UNIT;
7330 unsigned HOST_WIDE_INT indexi = offset * BITS_PER_UNIT;
7331 tree index = bitsize_int (indexi);
7333 if (offset/part_widthi <= TYPE_VECTOR_SUBPARTS (op00type))
7334 return fold_build3_loc (loc,
7335 BIT_FIELD_REF, type, op00,
7339 /* ((foo*)&complexfoo)[1] => __imag__ complexfoo */
7340 else if (TREE_CODE (op00type) == COMPLEX_TYPE
7341 && (same_type_ignoring_top_level_qualifiers_p
7342 (type, TREE_TYPE (op00type))))
7344 tree size = TYPE_SIZE_UNIT (type);
7345 if (tree_int_cst_equal (size, op01))
7346 return fold_build1_loc (loc, IMAGPART_EXPR, type, op00);
7348 /* ((foo *)&fooarray)[1] => fooarray[1] */
7349 else if (TREE_CODE (op00type) == ARRAY_TYPE
7350 && (same_type_ignoring_top_level_qualifiers_p
7351 (type, TREE_TYPE (op00type))))
7353 tree type_domain = TYPE_DOMAIN (op00type);
7354 tree min_val = size_zero_node;
7355 if (type_domain && TYPE_MIN_VALUE (type_domain))
7356 min_val = TYPE_MIN_VALUE (type_domain);
7357 op01 = size_binop_loc (loc, EXACT_DIV_EXPR, op01,
7358 TYPE_SIZE_UNIT (type));
7359 op01 = size_binop_loc (loc, PLUS_EXPR, op01, min_val);
7360 return build4_loc (loc, ARRAY_REF, type, op00, op01,
7361 NULL_TREE, NULL_TREE);
7363 /* ((foo *)&struct_with_foo_field)[1] => COMPONENT_REF */
7364 else if (RECORD_OR_UNION_TYPE_P (op00type))
7366 tree field = TYPE_FIELDS (op00type);
7367 for (; field; field = DECL_CHAIN (field))
7368 if (TREE_CODE (field) == FIELD_DECL
7369 && tree_int_cst_equal (byte_position (field), op01)
7370 && (same_type_ignoring_top_level_qualifiers_p
7371 (TREE_TYPE (field), type)))
7373 return fold_build3 (COMPONENT_REF, type, op00,
7380 /* *(foo *)fooarrptreturn> (*fooarrptr)[0] */
7381 else if (TREE_CODE (TREE_TYPE (subtype)) == ARRAY_TYPE
7382 && (same_type_ignoring_top_level_qualifiers_p
7383 (type, TREE_TYPE (TREE_TYPE (subtype)))))
7386 tree min_val = size_zero_node;
7387 sub = cxx_fold_indirect_ref (loc, TREE_TYPE (subtype), sub, NULL);
7389 sub = build1_loc (loc, INDIRECT_REF, TREE_TYPE (subtype), sub);
7390 type_domain = TYPE_DOMAIN (TREE_TYPE (sub));
7391 if (type_domain && TYPE_MIN_VALUE (type_domain))
7392 min_val = TYPE_MIN_VALUE (type_domain);
7393 return build4_loc (loc, ARRAY_REF, type, sub, min_val, NULL_TREE,
7401 cxx_eval_indirect_ref (const constexpr_call *call, tree t,
7402 bool allow_non_constant, bool addr,
7403 bool *non_constant_p)
7405 tree orig_op0 = TREE_OPERAND (t, 0);
7406 tree op0 = cxx_eval_constant_expression (call, orig_op0, allow_non_constant,
7407 /*addr*/false, non_constant_p);
7408 bool empty_base = false;
7411 /* Don't VERIFY_CONSTANT here. */
7412 if (*non_constant_p)
7415 r = cxx_fold_indirect_ref (EXPR_LOCATION (t), TREE_TYPE (t), op0,
7419 r = cxx_eval_constant_expression (call, r, allow_non_constant,
7420 addr, non_constant_p);
7425 if (TREE_CODE (sub) == POINTER_PLUS_EXPR)
7427 sub = TREE_OPERAND (sub, 0);
7430 if (TREE_CODE (sub) == ADDR_EXPR)
7432 /* We couldn't fold to a constant value. Make sure it's not
7433 something we should have been able to fold. */
7434 gcc_assert (!same_type_ignoring_top_level_qualifiers_p
7435 (TREE_TYPE (TREE_TYPE (sub)), TREE_TYPE (t)));
7436 /* DR 1188 says we don't have to deal with this. */
7437 if (!allow_non_constant)
7438 error ("accessing value of %qE through a %qT glvalue in a "
7439 "constant expression", build_fold_indirect_ref (sub),
7441 *non_constant_p = true;
7446 /* If we're pulling out the value of an empty base, make sure
7447 that the whole object is constant and then return an empty
7451 VERIFY_CONSTANT (r);
7452 r = build_constructor (TREE_TYPE (t), NULL);
7453 TREE_CONSTANT (r) = true;
7461 /* Complain about R, a VAR_DECL, not being usable in a constant expression.
7462 Shared between potential_constant_expression and
7463 cxx_eval_constant_expression. */
7466 non_const_var_error (tree r)
7468 tree type = TREE_TYPE (r);
7469 error ("the value of %qD is not usable in a constant "
7471 /* Avoid error cascade. */
7472 if (DECL_INITIAL (r) == error_mark_node)
7474 if (DECL_DECLARED_CONSTEXPR_P (r))
7475 inform (DECL_SOURCE_LOCATION (r),
7476 "%qD used in its own initializer", r);
7477 else if (INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7479 if (!CP_TYPE_CONST_P (type))
7480 inform (DECL_SOURCE_LOCATION (r),
7481 "%q#D is not const", r);
7482 else if (CP_TYPE_VOLATILE_P (type))
7483 inform (DECL_SOURCE_LOCATION (r),
7484 "%q#D is volatile", r);
7485 else if (!DECL_INITIAL (r)
7486 || !TREE_CONSTANT (DECL_INITIAL (r)))
7487 inform (DECL_SOURCE_LOCATION (r),
7488 "%qD was not initialized with a constant "
7495 if (cxx_dialect >= cxx0x && !DECL_DECLARED_CONSTEXPR_P (r))
7496 inform (DECL_SOURCE_LOCATION (r),
7497 "%qD was not declared %<constexpr%>", r);
7499 inform (DECL_SOURCE_LOCATION (r),
7500 "%qD does not have integral or enumeration type",
7505 /* Attempt to reduce the expression T to a constant value.
7506 On failure, issue diagnostic and return error_mark_node. */
7507 /* FIXME unify with c_fully_fold */
7510 cxx_eval_constant_expression (const constexpr_call *call, tree t,
7511 bool allow_non_constant, bool addr,
7512 bool *non_constant_p)
7516 if (t == error_mark_node)
7518 *non_constant_p = true;
7521 if (CONSTANT_CLASS_P (t))
7523 if (TREE_CODE (t) == PTRMEM_CST)
7524 t = cplus_expand_constant (t);
7527 if (TREE_CODE (t) != NOP_EXPR
7528 && reduced_constant_expression_p (t))
7531 switch (TREE_CODE (t))
7536 /* else fall through. */
7538 r = integral_constant_value (t);
7539 if (TREE_CODE (r) == TARGET_EXPR
7540 && TREE_CODE (TARGET_EXPR_INITIAL (r)) == CONSTRUCTOR)
7541 r = TARGET_EXPR_INITIAL (r);
7544 if (!allow_non_constant)
7545 non_const_var_error (r);
7546 *non_constant_p = true;
7556 if (call && DECL_CONTEXT (t) == call->fundef->decl)
7558 if (DECL_ARTIFICIAL (t) && DECL_CONSTRUCTOR_P (DECL_CONTEXT (t)))
7560 if (!allow_non_constant)
7561 sorry ("use of the value of the object being constructed "
7562 "in a constant expression");
7563 *non_constant_p = true;
7566 r = lookup_parameter_binding (call, t);
7569 /* Defer in case this is only used for its type. */;
7572 if (!allow_non_constant)
7573 error ("%qE is not a constant expression", t);
7574 *non_constant_p = true;
7579 case AGGR_INIT_EXPR:
7580 r = cxx_eval_call_expression (call, t, allow_non_constant, addr,
7585 if (!literal_type_p (TREE_TYPE (t)))
7587 if (!allow_non_constant)
7589 error ("temporary of non-literal type %qT in a "
7590 "constant expression", TREE_TYPE (t));
7591 explain_non_literal_class (TREE_TYPE (t));
7593 *non_constant_p = true;
7596 /* else fall through. */
7598 /* Pass false for 'addr' because these codes indicate
7599 initialization of a temporary. */
7600 r = cxx_eval_constant_expression (call, TREE_OPERAND (t, 1),
7601 allow_non_constant, false,
7603 if (!*non_constant_p)
7604 /* Adjust the type of the result to the type of the temporary. */
7605 r = adjust_temp_type (TREE_TYPE (t), r);
7609 r = cxx_eval_constant_expression (call, TREE_OPERAND (t, 1),
7610 allow_non_constant, addr,
7615 case NON_LVALUE_EXPR:
7616 case TRY_CATCH_EXPR:
7617 case CLEANUP_POINT_EXPR:
7618 case MUST_NOT_THROW_EXPR:
7620 r = cxx_eval_constant_expression (call, TREE_OPERAND (t, 0),
7621 allow_non_constant, addr,
7625 /* These differ from cxx_eval_unary_expression in that this doesn't
7626 check for a constant operand or result; an address can be
7627 constant without its operand being, and vice versa. */
7629 r = cxx_eval_indirect_ref (call, t, allow_non_constant, addr,
7635 tree oldop = TREE_OPERAND (t, 0);
7636 tree op = cxx_eval_constant_expression (call, oldop,
7640 /* Don't VERIFY_CONSTANT here. */
7641 if (*non_constant_p)
7643 /* This function does more aggressive folding than fold itself. */
7644 r = build_fold_addr_expr_with_type (op, TREE_TYPE (t));
7645 if (TREE_CODE (r) == ADDR_EXPR && TREE_OPERAND (r, 0) == oldop)
7653 case FIX_TRUNC_EXPR:
7658 case TRUTH_NOT_EXPR:
7659 case FIXED_CONVERT_EXPR:
7660 r = cxx_eval_unary_expression (call, t, allow_non_constant, addr,
7666 /* check_return_expr sometimes wraps a TARGET_EXPR in a
7667 COMPOUND_EXPR; don't get confused. Also handle EMPTY_CLASS_EXPR
7668 introduced by build_call_a. */
7669 tree op0 = TREE_OPERAND (t, 0);
7670 tree op1 = TREE_OPERAND (t, 1);
7672 if ((TREE_CODE (op0) == TARGET_EXPR && op1 == TARGET_EXPR_SLOT (op0))
7673 || TREE_CODE (op1) == EMPTY_CLASS_EXPR)
7674 r = cxx_eval_constant_expression (call, op0, allow_non_constant,
7675 addr, non_constant_p);
7678 /* Check that the LHS is constant and then discard it. */
7679 cxx_eval_constant_expression (call, op0, allow_non_constant,
7680 false, non_constant_p);
7681 r = cxx_eval_constant_expression (call, op1, allow_non_constant,
7682 addr, non_constant_p);
7687 case POINTER_PLUS_EXPR:
7691 case TRUNC_DIV_EXPR:
7693 case FLOOR_DIV_EXPR:
7694 case ROUND_DIV_EXPR:
7695 case TRUNC_MOD_EXPR:
7697 case ROUND_MOD_EXPR:
7699 case EXACT_DIV_EXPR:
7709 case TRUTH_XOR_EXPR:
7716 case UNORDERED_EXPR:
7725 r = cxx_eval_binary_expression (call, t, allow_non_constant, addr,
7729 /* fold can introduce non-IF versions of these; still treat them as
7730 short-circuiting. */
7731 case TRUTH_AND_EXPR:
7732 case TRUTH_ANDIF_EXPR:
7733 r = cxx_eval_logical_expression (call, t, boolean_false_node,
7735 allow_non_constant, addr,
7740 case TRUTH_ORIF_EXPR:
7741 r = cxx_eval_logical_expression (call, t, boolean_true_node,
7743 allow_non_constant, addr,
7748 r = cxx_eval_array_reference (call, t, allow_non_constant, addr,
7753 r = cxx_eval_component_reference (call, t, allow_non_constant, addr,
7758 r = cxx_eval_bit_field_ref (call, t, allow_non_constant, addr,
7764 r = cxx_eval_conditional_expression (call, t, allow_non_constant, addr,
7769 r = cxx_eval_bare_aggregate (call, t, allow_non_constant, addr,
7774 /* We can get this in a defaulted constructor for a class with a
7775 non-static data member of array type. Either the initializer will
7776 be NULL, meaning default-initialization, or it will be an lvalue
7777 or xvalue of the same type, meaning direct-initialization from the
7778 corresponding member. */
7779 r = cxx_eval_vec_init (call, t, allow_non_constant, addr,
7784 case VIEW_CONVERT_EXPR:
7787 tree oldop = TREE_OPERAND (t, 0);
7789 tree to = TREE_TYPE (t);
7790 op = cxx_eval_constant_expression (call, TREE_OPERAND (t, 0),
7791 allow_non_constant, addr,
7793 if (*non_constant_p)
7796 /* We didn't fold at the top so we could check for ptr-int
7799 r = fold_build1 (TREE_CODE (t), to, op);
7800 /* Conversion of an out-of-range value has implementation-defined
7801 behavior; the language considers it different from arithmetic
7802 overflow, which is undefined. */
7803 if (TREE_OVERFLOW_P (r) && !TREE_OVERFLOW_P (op))
7804 TREE_OVERFLOW (r) = false;
7808 case EMPTY_CLASS_EXPR:
7809 /* This is good enough for a function argument that might not get
7810 used, and they can't do anything with it, so just return it. */
7814 case PREINCREMENT_EXPR:
7815 case POSTINCREMENT_EXPR:
7816 case PREDECREMENT_EXPR:
7817 case POSTDECREMENT_EXPR:
7821 case VEC_DELETE_EXPR:
7825 /* GCC internal stuff. */
7828 case WITH_CLEANUP_EXPR:
7829 case STATEMENT_LIST:
7831 case NON_DEPENDENT_EXPR:
7835 if (!allow_non_constant)
7836 error_at (EXPR_LOC_OR_HERE (t),
7837 "expression %qE is not a constant-expression", t);
7838 *non_constant_p = true;
7842 internal_error ("unexpected expression %qE of kind %s", t,
7843 tree_code_name[TREE_CODE (t)]);
7844 *non_constant_p = true;
7848 if (r == error_mark_node)
7849 *non_constant_p = true;
7851 if (*non_constant_p)
7858 cxx_eval_outermost_constant_expr (tree t, bool allow_non_constant)
7860 bool non_constant_p = false;
7861 tree r = cxx_eval_constant_expression (NULL, t, allow_non_constant,
7862 false, &non_constant_p);
7864 verify_constant (r, allow_non_constant, &non_constant_p);
7866 if (TREE_CODE (t) != CONSTRUCTOR
7867 && cp_has_mutable_p (TREE_TYPE (t)))
7869 /* We allow a mutable type if the original expression was a
7870 CONSTRUCTOR so that we can do aggregate initialization of
7871 constexpr variables. */
7872 if (!allow_non_constant)
7873 error ("%qT cannot be the type of a complete constant expression "
7874 "because it has mutable sub-objects", TREE_TYPE (t));
7875 non_constant_p = true;
7878 /* Technically we should check this for all subexpressions, but that
7879 runs into problems with our internal representation of pointer
7880 subtraction and the 5.19 rules are still in flux. */
7881 if (CONVERT_EXPR_CODE_P (TREE_CODE (r))
7882 && ARITHMETIC_TYPE_P (TREE_TYPE (r))
7883 && TREE_CODE (TREE_OPERAND (r, 0)) == ADDR_EXPR)
7885 if (!allow_non_constant)
7886 error ("conversion from pointer type %qT "
7887 "to arithmetic type %qT in a constant-expression",
7888 TREE_TYPE (TREE_OPERAND (r, 0)), TREE_TYPE (r));
7889 non_constant_p = true;
7892 if (non_constant_p && !allow_non_constant)
7893 return error_mark_node;
7894 else if (non_constant_p && TREE_CONSTANT (t))
7896 /* This isn't actually constant, so unset TREE_CONSTANT. */
7897 if (EXPR_P (t) || TREE_CODE (t) == CONSTRUCTOR)
7900 r = build_nop (TREE_TYPE (t), t);
7901 TREE_CONSTANT (r) = false;
7904 else if (non_constant_p || r == t)
7906 else if (TREE_CODE (r) == CONSTRUCTOR && CLASS_TYPE_P (TREE_TYPE (r)))
7908 if (TREE_CODE (t) == TARGET_EXPR
7909 && TARGET_EXPR_INITIAL (t) == r)
7913 r = get_target_expr (r);
7914 TREE_CONSTANT (r) = true;
7922 /* Returns true if T is a valid subexpression of a constant expression,
7923 even if it isn't itself a constant expression. */
7926 is_sub_constant_expr (tree t)
7928 bool non_constant_p = false;
7929 cxx_eval_constant_expression (NULL, t, true, false, &non_constant_p);
7930 return !non_constant_p;
7933 /* If T represents a constant expression returns its reduced value.
7934 Otherwise return error_mark_node. If T is dependent, then
7938 cxx_constant_value (tree t)
7940 return cxx_eval_outermost_constant_expr (t, false);
7943 /* If T is a constant expression, returns its reduced value.
7944 Otherwise, if T does not have TREE_CONSTANT set, returns T.
7945 Otherwise, returns a version of T without TREE_CONSTANT. */
7948 maybe_constant_value (tree t)
7952 if (type_dependent_expression_p (t)
7953 || type_unknown_p (t)
7954 || BRACE_ENCLOSED_INITIALIZER_P (t)
7955 || !potential_constant_expression (t)
7956 || value_dependent_expression_p (t))
7958 if (TREE_OVERFLOW_P (t))
7960 t = build_nop (TREE_TYPE (t), t);
7961 TREE_CONSTANT (t) = false;
7966 r = cxx_eval_outermost_constant_expr (t, true);
7967 #ifdef ENABLE_CHECKING
7968 /* cp_tree_equal looks through NOPs, so allow them. */
7970 || CONVERT_EXPR_P (t)
7971 || (TREE_CONSTANT (t) && !TREE_CONSTANT (r))
7972 || !cp_tree_equal (r, t));
7977 /* Like maybe_constant_value, but returns a CONSTRUCTOR directly, rather
7978 than wrapped in a TARGET_EXPR. */
7981 maybe_constant_init (tree t)
7983 t = maybe_constant_value (t);
7984 if (TREE_CODE (t) == TARGET_EXPR)
7986 tree init = TARGET_EXPR_INITIAL (t);
7987 if (TREE_CODE (init) == CONSTRUCTOR
7988 && TREE_CONSTANT (init))
7995 /* FIXME see ADDR_EXPR section in potential_constant_expression_1. */
7996 /* Return true if the object referred to by REF has automatic or thread
7999 enum { ck_ok, ck_bad, ck_unknown };
8001 check_automatic_or_tls (tree ref)
8003 enum machine_mode mode;
8004 HOST_WIDE_INT bitsize, bitpos;
8006 int volatilep = 0, unsignedp = 0;
8007 tree decl = get_inner_reference (ref, &bitsize, &bitpos, &offset,
8008 &mode, &unsignedp, &volatilep, false);
8011 /* If there isn't a decl in the middle, we don't know the linkage here,
8012 and this isn't a constant expression anyway. */
8015 dk = decl_storage_duration (decl);
8016 return (dk == dk_auto || dk == dk_thread) ? ck_bad : ck_ok;
8020 /* Return true if T denotes a potentially constant expression. Issue
8021 diagnostic as appropriate under control of FLAGS. If WANT_RVAL is true,
8022 an lvalue-rvalue conversion is implied.
8024 C++0x [expr.const] used to say
8026 6 An expression is a potential constant expression if it is
8027 a constant expression where all occurences of function
8028 parameters are replaced by arbitrary constant expressions
8029 of the appropriate type.
8031 2 A conditional expression is a constant expression unless it
8032 involves one of the following as a potentially evaluated
8033 subexpression (3.2), but subexpressions of logical AND (5.14),
8034 logical OR (5.15), and conditional (5.16) operations that are
8035 not evaluated are not considered. */
8038 potential_constant_expression_1 (tree t, bool want_rval, tsubst_flags_t flags)
8040 enum { any = false, rval = true };
8044 /* C++98 has different rules for the form of a constant expression that
8045 are enforced in the parser, so we can assume that anything that gets
8046 this far is suitable. */
8047 if (cxx_dialect < cxx0x)
8050 if (t == error_mark_node)
8054 if (TREE_THIS_VOLATILE (t))
8056 if (flags & tf_error)
8057 error ("expression %qE has side-effects", t);
8060 if (CONSTANT_CLASS_P (t))
8062 if (TREE_OVERFLOW (t))
8064 if (flags & tf_error)
8066 permerror (EXPR_LOC_OR_HERE (t),
8067 "overflow in constant expression");
8068 if (flag_permissive)
8076 switch (TREE_CODE (t))
8082 case TEMPLATE_ID_EXPR:
8089 case TEMPLATE_PARM_INDEX:
8091 case IDENTIFIER_NODE:
8092 case USERDEF_LITERAL:
8093 /* We can see a FIELD_DECL in a pointer-to-member expression. */
8099 case AGGR_INIT_EXPR:
8101 /* -- an invocation of a function other than a constexpr function
8102 or a constexpr constructor. */
8104 tree fun = get_function_named_in_call (t);
8105 const int nargs = call_expr_nargs (t);
8108 if (is_overloaded_fn (fun))
8110 if (TREE_CODE (fun) == FUNCTION_DECL)
8112 if (builtin_valid_in_constant_expr_p (fun))
8114 if (!DECL_DECLARED_CONSTEXPR_P (fun)
8115 /* Allow any built-in function; if the expansion
8116 isn't constant, we'll deal with that then. */
8117 && !is_builtin_fn (fun))
8119 if (flags & tf_error)
8121 error_at (EXPR_LOC_OR_HERE (t),
8122 "call to non-constexpr function %qD", fun);
8123 explain_invalid_constexpr_fn (fun);
8127 /* A call to a non-static member function takes the address
8128 of the object as the first argument. But in a constant
8129 expression the address will be folded away, so look
8131 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fun)
8132 && !DECL_CONSTRUCTOR_P (fun))
8134 tree x = get_nth_callarg (t, 0);
8135 if (is_this_parameter (x))
8137 if (DECL_CONSTRUCTOR_P (DECL_CONTEXT (x)))
8139 if (flags & tf_error)
8140 sorry ("calling a member function of the "
8141 "object being constructed in a constant "
8145 /* Otherwise OK. */;
8147 else if (!potential_constant_expression_1 (x, rval, flags))
8153 fun = get_first_fn (fun);
8154 /* Skip initial arguments to base constructors. */
8155 if (DECL_BASE_CONSTRUCTOR_P (fun))
8156 i = num_artificial_parms_for (fun);
8157 fun = DECL_ORIGIN (fun);
8161 if (potential_constant_expression_1 (fun, rval, flags))
8162 /* Might end up being a constant function pointer. */;
8166 for (; i < nargs; ++i)
8168 tree x = get_nth_callarg (t, i);
8169 if (!potential_constant_expression_1 (x, rval, flags))
8175 case NON_LVALUE_EXPR:
8176 /* -- an lvalue-to-rvalue conversion (4.1) unless it is applied to
8177 -- an lvalue of integral type that refers to a non-volatile
8178 const variable or static data member initialized with
8179 constant expressions, or
8181 -- an lvalue of literal type that refers to non-volatile
8182 object defined with constexpr, or that refers to a
8183 sub-object of such an object; */
8184 return potential_constant_expression_1 (TREE_OPERAND (t, 0), rval, flags);
8187 if (want_rval && !decl_constant_var_p (t)
8188 && !dependent_type_p (TREE_TYPE (t)))
8190 if (flags & tf_error)
8191 non_const_var_error (t);
8198 case VIEW_CONVERT_EXPR:
8199 /* -- a reinterpret_cast. FIXME not implemented, and this rule
8200 may change to something more specific to type-punning (DR 1312). */
8202 tree from = TREE_OPERAND (t, 0);
8203 return (potential_constant_expression_1
8204 (from, TREE_CODE (t) != VIEW_CONVERT_EXPR, flags));
8208 /* -- a unary operator & that is applied to an lvalue that
8209 designates an object with thread or automatic storage
8211 t = TREE_OPERAND (t, 0);
8213 /* FIXME adjust when issue 1197 is fully resolved. For now don't do
8214 any checking here, as we might dereference the pointer later. If
8215 we remove this code, also remove check_automatic_or_tls. */
8216 i = check_automatic_or_tls (t);
8221 if (flags & tf_error)
8222 error ("address-of an object %qE with thread local or "
8223 "automatic storage is not a constant expression", t);
8227 return potential_constant_expression_1 (t, any, flags);
8233 /* -- a class member access unless its postfix-expression is
8234 of literal type or of pointer to literal type. */
8235 /* This test would be redundant, as it follows from the
8236 postfix-expression being a potential constant expression. */
8237 return potential_constant_expression_1 (TREE_OPERAND (t, 0),
8240 case EXPR_PACK_EXPANSION:
8241 return potential_constant_expression_1 (PACK_EXPANSION_PATTERN (t),
8246 tree x = TREE_OPERAND (t, 0);
8248 if (is_this_parameter (x))
8250 if (want_rval && DECL_CONTEXT (x)
8251 && DECL_CONSTRUCTOR_P (DECL_CONTEXT (x)))
8253 if (flags & tf_error)
8254 sorry ("use of the value of the object being constructed "
8255 "in a constant expression");
8260 return potential_constant_expression_1 (x, rval, flags);
8264 case DYNAMIC_CAST_EXPR:
8265 case PSEUDO_DTOR_EXPR:
8266 case PREINCREMENT_EXPR:
8267 case POSTINCREMENT_EXPR:
8268 case PREDECREMENT_EXPR:
8269 case POSTDECREMENT_EXPR:
8273 case VEC_DELETE_EXPR:
8277 /* GCC internal stuff. */
8280 case WITH_CLEANUP_EXPR:
8281 case CLEANUP_POINT_EXPR:
8282 case MUST_NOT_THROW_EXPR:
8283 case TRY_CATCH_EXPR:
8284 case STATEMENT_LIST:
8285 /* Don't bother trying to define a subset of statement-expressions to
8286 be constant-expressions, at least for now. */
8290 case TRANSACTION_EXPR:
8295 if (flags & tf_error)
8296 error ("expression %qE is not a constant-expression", t);
8300 /* -- a typeid expression whose operand is of polymorphic
8303 tree e = TREE_OPERAND (t, 0);
8304 if (!TYPE_P (e) && !type_dependent_expression_p (e)
8305 && TYPE_POLYMORPHIC_P (TREE_TYPE (e)))
8307 if (flags & tf_error)
8308 error ("typeid-expression is not a constant expression "
8309 "because %qE is of polymorphic type", e);
8316 /* -- a subtraction where both operands are pointers. */
8317 if (TYPE_PTR_P (TREE_OPERAND (t, 0))
8318 && TYPE_PTR_P (TREE_OPERAND (t, 1)))
8320 if (flags & tf_error)
8321 error ("difference of two pointer expressions is not "
8322 "a constant expression");
8334 /* -- a relational or equality operator where at least
8335 one of the operands is a pointer. */
8336 if (TYPE_PTR_P (TREE_OPERAND (t, 0))
8337 || TYPE_PTR_P (TREE_OPERAND (t, 1)))
8339 if (flags & tf_error)
8340 error ("pointer comparison expression is not a "
8341 "constant expression");
8349 if (TYPE_P (TREE_OPERAND (t, 0)))
8351 /* else fall through. */
8357 case FIX_TRUNC_EXPR:
8361 case TRUTH_NOT_EXPR:
8362 case FIXED_CONVERT_EXPR:
8363 case UNARY_PLUS_EXPR:
8364 return potential_constant_expression_1 (TREE_OPERAND (t, 0), rval,
8368 case CONST_CAST_EXPR:
8369 case STATIC_CAST_EXPR:
8370 case REINTERPRET_CAST_EXPR:
8371 case IMPLICIT_CONV_EXPR:
8372 return (potential_constant_expression_1
8373 (TREE_OPERAND (t, 0),
8374 TREE_CODE (TREE_TYPE (t)) != REFERENCE_TYPE, flags));
8377 case NON_DEPENDENT_EXPR:
8378 /* For convenience. */
8380 return potential_constant_expression_1 (TREE_OPERAND (t, 0),
8384 return potential_constant_expression_1 (TREE_OPERAND (t, 1),
8388 if (!literal_type_p (TREE_TYPE (t)))
8390 if (flags & tf_error)
8392 error ("temporary of non-literal type %qT in a "
8393 "constant expression", TREE_TYPE (t));
8394 explain_non_literal_class (TREE_TYPE (t));
8399 return potential_constant_expression_1 (TREE_OPERAND (t, 1),
8404 VEC(constructor_elt, gc) *v = CONSTRUCTOR_ELTS (t);
8405 constructor_elt *ce;
8406 for (i = 0; VEC_iterate (constructor_elt, v, i, ce); ++i)
8407 if (!potential_constant_expression_1 (ce->value, want_rval, flags))
8414 gcc_assert (TREE_PURPOSE (t) == NULL_TREE
8415 || DECL_P (TREE_PURPOSE (t)));
8416 if (!potential_constant_expression_1 (TREE_VALUE (t), want_rval,
8419 if (TREE_CHAIN (t) == NULL_TREE)
8421 return potential_constant_expression_1 (TREE_CHAIN (t), want_rval,
8425 case TRUNC_DIV_EXPR:
8427 case FLOOR_DIV_EXPR:
8428 case ROUND_DIV_EXPR:
8429 case TRUNC_MOD_EXPR:
8431 case ROUND_MOD_EXPR:
8433 tree denom = TREE_OPERAND (t, 1);
8434 /* We can't call maybe_constant_value on an expression
8435 that hasn't been through fold_non_dependent_expr yet. */
8436 if (!processing_template_decl)
8437 denom = maybe_constant_value (denom);
8438 if (integer_zerop (denom))
8440 if (flags & tf_error)
8441 error ("division by zero is not a constant-expression");
8453 /* check_return_expr sometimes wraps a TARGET_EXPR in a
8454 COMPOUND_EXPR; don't get confused. Also handle EMPTY_CLASS_EXPR
8455 introduced by build_call_a. */
8456 tree op0 = TREE_OPERAND (t, 0);
8457 tree op1 = TREE_OPERAND (t, 1);
8459 if ((TREE_CODE (op0) == TARGET_EXPR && op1 == TARGET_EXPR_SLOT (op0))
8460 || TREE_CODE (op1) == EMPTY_CLASS_EXPR)
8461 return potential_constant_expression_1 (op0, want_rval, flags);
8466 /* If the first operand is the non-short-circuit constant, look at
8467 the second operand; otherwise we only care about the first one for
8469 case TRUTH_AND_EXPR:
8470 case TRUTH_ANDIF_EXPR:
8471 tmp = boolean_true_node;
8474 case TRUTH_ORIF_EXPR:
8475 tmp = boolean_false_node;
8477 if (TREE_OPERAND (t, 0) == tmp)
8478 return potential_constant_expression_1 (TREE_OPERAND (t, 1), rval, flags);
8480 return potential_constant_expression_1 (TREE_OPERAND (t, 0), rval, flags);
8484 case POINTER_PLUS_EXPR:
8486 case EXACT_DIV_EXPR:
8496 case TRUTH_XOR_EXPR:
8497 case UNORDERED_EXPR:
8510 case ARRAY_RANGE_REF:
8514 for (i = 0; i < 2; ++i)
8515 if (!potential_constant_expression_1 (TREE_OPERAND (t, i),
8521 for (i = 0; i < 3; ++i)
8522 if (!potential_constant_expression_1 (TREE_OPERAND (t, i),
8529 /* If the condition is a known constant, we know which of the legs we
8530 care about; otherwise we only require that the condition and
8531 either of the legs be potentially constant. */
8532 tmp = TREE_OPERAND (t, 0);
8533 if (!potential_constant_expression_1 (tmp, rval, flags))
8535 else if (integer_zerop (tmp))
8536 return potential_constant_expression_1 (TREE_OPERAND (t, 2),
8538 else if (TREE_CODE (tmp) == INTEGER_CST)
8539 return potential_constant_expression_1 (TREE_OPERAND (t, 1),
8541 for (i = 1; i < 3; ++i)
8542 if (potential_constant_expression_1 (TREE_OPERAND (t, i),
8543 want_rval, tf_none))
8545 if (flags & tf_error)
8546 error ("expression %qE is not a constant-expression", t);
8550 if (VEC_INIT_EXPR_IS_CONSTEXPR (t))
8552 if (flags & tf_error)
8554 error ("non-constant array initialization");
8555 diagnose_non_constexpr_vec_init (t);
8560 sorry ("unexpected AST of kind %s", tree_code_name[TREE_CODE (t)]);
8566 /* The main entry point to the above. */
8569 potential_constant_expression (tree t)
8571 return potential_constant_expression_1 (t, false, tf_none);
8574 /* As above, but require a constant rvalue. */
8577 potential_rvalue_constant_expression (tree t)
8579 return potential_constant_expression_1 (t, true, tf_none);
8582 /* Like above, but complain about non-constant expressions. */
8585 require_potential_constant_expression (tree t)
8587 return potential_constant_expression_1 (t, false, tf_warning_or_error);
8590 /* Cross product of the above. */
8593 require_potential_rvalue_constant_expression (tree t)
8595 return potential_constant_expression_1 (t, true, tf_warning_or_error);
8598 /* Constructor for a lambda expression. */
8601 build_lambda_expr (void)
8603 tree lambda = make_node (LAMBDA_EXPR);
8604 LAMBDA_EXPR_DEFAULT_CAPTURE_MODE (lambda) = CPLD_NONE;
8605 LAMBDA_EXPR_CAPTURE_LIST (lambda) = NULL_TREE;
8606 LAMBDA_EXPR_THIS_CAPTURE (lambda) = NULL_TREE;
8607 LAMBDA_EXPR_PENDING_PROXIES (lambda) = NULL;
8608 LAMBDA_EXPR_RETURN_TYPE (lambda) = NULL_TREE;
8609 LAMBDA_EXPR_MUTABLE_P (lambda) = false;
8613 /* Create the closure object for a LAMBDA_EXPR. */
8616 build_lambda_object (tree lambda_expr)
8618 /* Build aggregate constructor call.
8619 - cp_parser_braced_list
8620 - cp_parser_functional_cast */
8621 VEC(constructor_elt,gc) *elts = NULL;
8622 tree node, expr, type;
8623 location_t saved_loc;
8625 if (processing_template_decl)
8628 /* Make sure any error messages refer to the lambda-introducer. */
8629 saved_loc = input_location;
8630 input_location = LAMBDA_EXPR_LOCATION (lambda_expr);
8632 for (node = LAMBDA_EXPR_CAPTURE_LIST (lambda_expr);
8634 node = TREE_CHAIN (node))
8636 tree field = TREE_PURPOSE (node);
8637 tree val = TREE_VALUE (node);
8639 if (field == error_mark_node)
8641 expr = error_mark_node;
8648 /* Mere mortals can't copy arrays with aggregate initialization, so
8649 do some magic to make it work here. */
8650 if (TREE_CODE (TREE_TYPE (field)) == ARRAY_TYPE)
8651 val = build_array_copy (val);
8652 else if (DECL_NORMAL_CAPTURE_P (field)
8653 && TREE_CODE (TREE_TYPE (field)) != REFERENCE_TYPE)
8655 /* "the entities that are captured by copy are used to
8656 direct-initialize each corresponding non-static data
8657 member of the resulting closure object."
8659 There's normally no way to express direct-initialization
8660 from an element of a CONSTRUCTOR, so we build up a special
8661 TARGET_EXPR to bypass the usual copy-initialization. */
8662 val = force_rvalue (val, tf_warning_or_error);
8663 if (TREE_CODE (val) == TARGET_EXPR)
8664 TARGET_EXPR_DIRECT_INIT_P (val) = true;
8667 CONSTRUCTOR_APPEND_ELT (elts, DECL_NAME (field), val);
8670 expr = build_constructor (init_list_type_node, elts);
8671 CONSTRUCTOR_IS_DIRECT_INIT (expr) = 1;
8673 /* N2927: "[The closure] class type is not an aggregate."
8674 But we briefly treat it as an aggregate to make this simpler. */
8675 type = LAMBDA_EXPR_CLOSURE (lambda_expr);
8676 CLASSTYPE_NON_AGGREGATE (type) = 0;
8677 expr = finish_compound_literal (type, expr, tf_warning_or_error);
8678 CLASSTYPE_NON_AGGREGATE (type) = 1;
8681 input_location = saved_loc;
8685 /* Return an initialized RECORD_TYPE for LAMBDA.
8686 LAMBDA must have its explicit captures already. */
8689 begin_lambda_type (tree lambda)
8694 /* Unique name. This is just like an unnamed class, but we cannot use
8695 make_anon_name because of certain checks against TYPE_ANONYMOUS_P. */
8697 name = make_lambda_name ();
8699 /* Create the new RECORD_TYPE for this lambda. */
8700 type = xref_tag (/*tag_code=*/record_type,
8702 /*scope=*/ts_within_enclosing_non_class,
8703 /*template_header_p=*/false);
8706 /* Designate it as a struct so that we can use aggregate initialization. */
8707 CLASSTYPE_DECLARED_CLASS (type) = false;
8709 /* Clear base types. */
8710 xref_basetypes (type, /*bases=*/NULL_TREE);
8712 /* Start the class. */
8713 type = begin_class_definition (type);
8714 if (type == error_mark_node)
8715 return error_mark_node;
8717 /* Cross-reference the expression and the type. */
8718 LAMBDA_EXPR_CLOSURE (lambda) = type;
8719 CLASSTYPE_LAMBDA_EXPR (type) = lambda;
8724 /* Returns the type to use for the return type of the operator() of a
8728 lambda_return_type (tree expr)
8731 if (type_unknown_p (expr)
8732 || BRACE_ENCLOSED_INITIALIZER_P (expr))
8734 cxx_incomplete_type_error (expr, TREE_TYPE (expr));
8735 return void_type_node;
8737 if (type_dependent_expression_p (expr))
8738 type = dependent_lambda_return_type_node;
8740 type = cv_unqualified (type_decays_to (unlowered_expr_type (expr)));
8744 /* Given a LAMBDA_EXPR or closure type LAMBDA, return the op() of the
8748 lambda_function (tree lambda)
8751 if (TREE_CODE (lambda) == LAMBDA_EXPR)
8752 type = LAMBDA_EXPR_CLOSURE (lambda);
8755 gcc_assert (LAMBDA_TYPE_P (type));
8756 /* Don't let debug_tree cause instantiation. */
8757 if (CLASSTYPE_TEMPLATE_INSTANTIATION (type)
8758 && !COMPLETE_OR_OPEN_TYPE_P (type))
8760 lambda = lookup_member (type, ansi_opname (CALL_EXPR),
8761 /*protect=*/0, /*want_type=*/false,
8762 tf_warning_or_error);
8764 lambda = BASELINK_FUNCTIONS (lambda);
8768 /* Returns the type to use for the FIELD_DECL corresponding to the
8770 The caller should add REFERENCE_TYPE for capture by reference. */
8773 lambda_capture_field_type (tree expr)
8776 if (type_dependent_expression_p (expr))
8778 type = cxx_make_type (DECLTYPE_TYPE);
8779 DECLTYPE_TYPE_EXPR (type) = expr;
8780 DECLTYPE_FOR_LAMBDA_CAPTURE (type) = true;
8781 SET_TYPE_STRUCTURAL_EQUALITY (type);
8784 type = non_reference (unlowered_expr_type (expr));
8788 /* Recompute the return type for LAMBDA with body of the form:
8789 { return EXPR ; } */
8792 apply_lambda_return_type (tree lambda, tree return_type)
8794 tree fco = lambda_function (lambda);
8797 LAMBDA_EXPR_RETURN_TYPE (lambda) = return_type;
8799 if (return_type == error_mark_node)
8801 if (TREE_TYPE (TREE_TYPE (fco)) == return_type)
8804 /* TREE_TYPE (FUNCTION_DECL) == METHOD_TYPE
8805 TREE_TYPE (METHOD_TYPE) == return-type */
8806 TREE_TYPE (fco) = change_return_type (return_type, TREE_TYPE (fco));
8808 result = DECL_RESULT (fco);
8809 if (result == NULL_TREE)
8812 /* We already have a DECL_RESULT from start_preparsed_function.
8813 Now we need to redo the work it and allocate_struct_function
8814 did to reflect the new type. */
8815 gcc_assert (current_function_decl == fco);
8816 result = build_decl (input_location, RESULT_DECL, NULL_TREE,
8817 TYPE_MAIN_VARIANT (return_type));
8818 DECL_ARTIFICIAL (result) = 1;
8819 DECL_IGNORED_P (result) = 1;
8820 cp_apply_type_quals_to_decl (cp_type_quals (return_type),
8823 DECL_RESULT (fco) = result;
8825 if (!processing_template_decl && aggregate_value_p (result, fco))
8827 #ifdef PCC_STATIC_STRUCT_RETURN
8828 cfun->returns_pcc_struct = 1;
8830 cfun->returns_struct = 1;
8835 /* DECL is a local variable or parameter from the surrounding scope of a
8836 lambda-expression. Returns the decltype for a use of the capture field
8837 for DECL even if it hasn't been captured yet. */
8840 capture_decltype (tree decl)
8842 tree lam = CLASSTYPE_LAMBDA_EXPR (DECL_CONTEXT (current_function_decl));
8843 /* FIXME do lookup instead of list walk? */
8844 tree cap = value_member (decl, LAMBDA_EXPR_CAPTURE_LIST (lam));
8848 type = TREE_TYPE (TREE_PURPOSE (cap));
8850 switch (LAMBDA_EXPR_DEFAULT_CAPTURE_MODE (lam))
8853 error ("%qD is not captured", decl);
8854 return error_mark_node;
8857 type = TREE_TYPE (decl);
8858 if (TREE_CODE (type) == REFERENCE_TYPE
8859 && TREE_CODE (TREE_TYPE (type)) != FUNCTION_TYPE)
8860 type = TREE_TYPE (type);
8863 case CPLD_REFERENCE:
8864 type = TREE_TYPE (decl);
8865 if (TREE_CODE (type) != REFERENCE_TYPE)
8866 type = build_reference_type (TREE_TYPE (decl));
8873 if (TREE_CODE (type) != REFERENCE_TYPE)
8875 if (!LAMBDA_EXPR_MUTABLE_P (lam))
8876 type = cp_build_qualified_type (type, (cp_type_quals (type)
8878 type = build_reference_type (type);
8883 /* Returns true iff DECL is a lambda capture proxy variable created by
8884 build_capture_proxy. */
8887 is_capture_proxy (tree decl)
8889 return (TREE_CODE (decl) == VAR_DECL
8890 && DECL_HAS_VALUE_EXPR_P (decl)
8891 && !DECL_ANON_UNION_VAR_P (decl)
8892 && LAMBDA_FUNCTION_P (DECL_CONTEXT (decl)));
8895 /* Returns true iff DECL is a capture proxy for a normal capture
8896 (i.e. without explicit initializer). */
8899 is_normal_capture_proxy (tree decl)
8903 if (!is_capture_proxy (decl))
8904 /* It's not a capture proxy. */
8907 /* It is a capture proxy, is it a normal capture? */
8908 val = DECL_VALUE_EXPR (decl);
8909 gcc_assert (TREE_CODE (val) == COMPONENT_REF);
8910 val = TREE_OPERAND (val, 1);
8911 return DECL_NORMAL_CAPTURE_P (val);
8914 /* VAR is a capture proxy created by build_capture_proxy; add it to the
8915 current function, which is the operator() for the appropriate lambda. */
8918 insert_capture_proxy (tree var)
8920 cp_binding_level *b;
8924 /* Put the capture proxy in the extra body block so that it won't clash
8925 with a later local variable. */
8926 b = current_binding_level;
8927 for (skip = 0; ; ++skip)
8929 cp_binding_level *n = b->level_chain;
8930 if (n->kind == sk_function_parms)
8934 pushdecl_with_scope (var, b, false);
8936 /* And put a DECL_EXPR in the STATEMENT_LIST for the same block. */
8937 var = build_stmt (DECL_SOURCE_LOCATION (var), DECL_EXPR, var);
8938 stmt_list = VEC_index (tree, stmt_list_stack,
8939 VEC_length (tree, stmt_list_stack) - 1 - skip);
8940 gcc_assert (stmt_list);
8941 append_to_statement_list_force (var, &stmt_list);
8944 /* We've just finished processing a lambda; if the containing scope is also
8945 a lambda, insert any capture proxies that were created while processing
8946 the nested lambda. */
8949 insert_pending_capture_proxies (void)
8952 VEC(tree,gc) *proxies;
8955 if (!current_function_decl || !LAMBDA_FUNCTION_P (current_function_decl))
8958 lam = CLASSTYPE_LAMBDA_EXPR (DECL_CONTEXT (current_function_decl));
8959 proxies = LAMBDA_EXPR_PENDING_PROXIES (lam);
8960 for (i = 0; i < VEC_length (tree, proxies); ++i)
8962 tree var = VEC_index (tree, proxies, i);
8963 insert_capture_proxy (var);
8965 release_tree_vector (LAMBDA_EXPR_PENDING_PROXIES (lam));
8966 LAMBDA_EXPR_PENDING_PROXIES (lam) = NULL;
8969 /* Given REF, a COMPONENT_REF designating a field in the lambda closure,
8970 return the type we want the proxy to have: the type of the field itself,
8971 with added const-qualification if the lambda isn't mutable and the
8972 capture is by value. */
8975 lambda_proxy_type (tree ref)
8978 if (REFERENCE_REF_P (ref))
8979 ref = TREE_OPERAND (ref, 0);
8980 type = TREE_TYPE (ref);
8981 if (!dependent_type_p (type))
8983 type = cxx_make_type (DECLTYPE_TYPE);
8984 DECLTYPE_TYPE_EXPR (type) = ref;
8985 DECLTYPE_FOR_LAMBDA_PROXY (type) = true;
8986 SET_TYPE_STRUCTURAL_EQUALITY (type);
8990 /* MEMBER is a capture field in a lambda closure class. Now that we're
8991 inside the operator(), build a placeholder var for future lookups and
8995 build_capture_proxy (tree member)
8997 tree var, object, fn, closure, name, lam, type;
8999 closure = DECL_CONTEXT (member);
9000 fn = lambda_function (closure);
9001 lam = CLASSTYPE_LAMBDA_EXPR (closure);
9003 /* The proxy variable forwards to the capture field. */
9004 object = build_fold_indirect_ref (DECL_ARGUMENTS (fn));
9005 object = finish_non_static_data_member (member, object, NULL_TREE);
9006 if (REFERENCE_REF_P (object))
9007 object = TREE_OPERAND (object, 0);
9009 /* Remove the __ inserted by add_capture. */
9010 name = get_identifier (IDENTIFIER_POINTER (DECL_NAME (member)) + 2);
9012 type = lambda_proxy_type (object);
9013 var = build_decl (input_location, VAR_DECL, name, type);
9014 SET_DECL_VALUE_EXPR (var, object);
9015 DECL_HAS_VALUE_EXPR_P (var) = 1;
9016 DECL_ARTIFICIAL (var) = 1;
9017 TREE_USED (var) = 1;
9018 DECL_CONTEXT (var) = fn;
9020 if (name == this_identifier)
9022 gcc_assert (LAMBDA_EXPR_THIS_CAPTURE (lam) == member);
9023 LAMBDA_EXPR_THIS_CAPTURE (lam) = var;
9026 if (fn == current_function_decl)
9027 insert_capture_proxy (var);
9029 VEC_safe_push (tree, gc, LAMBDA_EXPR_PENDING_PROXIES (lam), var);
9034 /* From an ID and INITIALIZER, create a capture (by reference if
9035 BY_REFERENCE_P is true), add it to the capture-list for LAMBDA,
9039 add_capture (tree lambda, tree id, tree initializer, bool by_reference_p,
9040 bool explicit_init_p)
9043 tree type, member, name;
9045 type = lambda_capture_field_type (initializer);
9048 type = build_reference_type (type);
9049 if (!real_lvalue_p (initializer))
9050 error ("cannot capture %qE by reference", initializer);
9053 /* Capture by copy requires a complete type. */
9054 type = complete_type (type);
9056 /* Add __ to the beginning of the field name so that user code
9057 won't find the field with name lookup. We can't just leave the name
9058 unset because template instantiation uses the name to find
9059 instantiated fields. */
9060 buf = (char *) alloca (IDENTIFIER_LENGTH (id) + 3);
9061 buf[1] = buf[0] = '_';
9062 memcpy (buf + 2, IDENTIFIER_POINTER (id),
9063 IDENTIFIER_LENGTH (id) + 1);
9064 name = get_identifier (buf);
9066 /* If TREE_TYPE isn't set, we're still in the introducer, so check
9068 if (!LAMBDA_EXPR_CLOSURE (lambda))
9070 if (IDENTIFIER_MARKED (name))
9072 pedwarn (input_location, 0,
9073 "already captured %qD in lambda expression", id);
9076 IDENTIFIER_MARKED (name) = true;
9079 /* Make member variable. */
9080 member = build_lang_decl (FIELD_DECL, name, type);
9082 if (!explicit_init_p)
9083 /* Normal captures are invisible to name lookup but uses are replaced
9084 with references to the capture field; we implement this by only
9085 really making them invisible in unevaluated context; see
9086 qualify_lookup. For now, let's make explicitly initialized captures
9088 DECL_NORMAL_CAPTURE_P (member) = true;
9090 if (id == this_identifier)
9091 LAMBDA_EXPR_THIS_CAPTURE (lambda) = member;
9093 /* Add it to the appropriate closure class if we've started it. */
9094 if (current_class_type
9095 && current_class_type == LAMBDA_EXPR_CLOSURE (lambda))
9096 finish_member_declaration (member);
9098 LAMBDA_EXPR_CAPTURE_LIST (lambda)
9099 = tree_cons (member, initializer, LAMBDA_EXPR_CAPTURE_LIST (lambda));
9101 if (LAMBDA_EXPR_CLOSURE (lambda))
9102 return build_capture_proxy (member);
9103 /* For explicit captures we haven't started the function yet, so we wait
9104 and build the proxy from cp_parser_lambda_body. */
9108 /* Register all the capture members on the list CAPTURES, which is the
9109 LAMBDA_EXPR_CAPTURE_LIST for the lambda after the introducer. */
9112 register_capture_members (tree captures)
9114 if (captures == NULL_TREE)
9117 register_capture_members (TREE_CHAIN (captures));
9118 /* We set this in add_capture to avoid duplicates. */
9119 IDENTIFIER_MARKED (DECL_NAME (TREE_PURPOSE (captures))) = false;
9120 finish_member_declaration (TREE_PURPOSE (captures));
9123 /* Similar to add_capture, except this works on a stack of nested lambdas.
9124 BY_REFERENCE_P in this case is derived from the default capture mode.
9125 Returns the capture for the lambda at the bottom of the stack. */
9128 add_default_capture (tree lambda_stack, tree id, tree initializer)
9130 bool this_capture_p = (id == this_identifier);
9132 tree var = NULL_TREE;
9134 tree saved_class_type = current_class_type;
9138 for (node = lambda_stack;
9140 node = TREE_CHAIN (node))
9142 tree lambda = TREE_VALUE (node);
9144 current_class_type = LAMBDA_EXPR_CLOSURE (lambda);
9145 var = add_capture (lambda,
9150 && (LAMBDA_EXPR_DEFAULT_CAPTURE_MODE (lambda)
9151 == CPLD_REFERENCE)),
9152 /*explicit_init_p=*/false);
9153 initializer = convert_from_reference (var);
9156 current_class_type = saved_class_type;
9161 /* Return the capture pertaining to a use of 'this' in LAMBDA, in the form of an
9162 INDIRECT_REF, possibly adding it through default capturing. */
9165 lambda_expr_this_capture (tree lambda)
9169 tree this_capture = LAMBDA_EXPR_THIS_CAPTURE (lambda);
9171 /* Try to default capture 'this' if we can. */
9173 && LAMBDA_EXPR_DEFAULT_CAPTURE_MODE (lambda) != CPLD_NONE)
9175 tree containing_function = TYPE_CONTEXT (LAMBDA_EXPR_CLOSURE (lambda));
9176 tree lambda_stack = tree_cons (NULL_TREE, lambda, NULL_TREE);
9177 tree init = NULL_TREE;
9179 /* If we are in a lambda function, we can move out until we hit:
9180 1. a non-lambda function,
9181 2. a lambda function capturing 'this', or
9182 3. a non-default capturing lambda function. */
9183 while (LAMBDA_FUNCTION_P (containing_function))
9186 = CLASSTYPE_LAMBDA_EXPR (DECL_CONTEXT (containing_function));
9188 if (LAMBDA_EXPR_THIS_CAPTURE (lambda))
9190 /* An outer lambda has already captured 'this'. */
9191 init = LAMBDA_EXPR_THIS_CAPTURE (lambda);
9195 if (LAMBDA_EXPR_DEFAULT_CAPTURE_MODE (lambda) == CPLD_NONE)
9196 /* An outer lambda won't let us capture 'this'. */
9199 lambda_stack = tree_cons (NULL_TREE,
9203 containing_function = decl_function_context (containing_function);
9206 if (!init && DECL_NONSTATIC_MEMBER_FUNCTION_P (containing_function)
9207 && !LAMBDA_FUNCTION_P (containing_function))
9208 /* First parameter is 'this'. */
9209 init = DECL_ARGUMENTS (containing_function);
9212 this_capture = add_default_capture (lambda_stack,
9213 /*id=*/this_identifier,
9219 error ("%<this%> was not captured for this lambda function");
9220 result = error_mark_node;
9224 /* To make sure that current_class_ref is for the lambda. */
9225 gcc_assert (TYPE_MAIN_VARIANT (TREE_TYPE (current_class_ref))
9226 == LAMBDA_EXPR_CLOSURE (lambda));
9228 result = this_capture;
9230 /* If 'this' is captured, each use of 'this' is transformed into an
9231 access to the corresponding unnamed data member of the closure
9232 type cast (_expr.cast_ 5.4) to the type of 'this'. [ The cast
9233 ensures that the transformed expression is an rvalue. ] */
9234 result = rvalue (result);
9240 /* Returns the method basetype of the innermost non-lambda function, or
9241 NULL_TREE if none. */
9244 nonlambda_method_basetype (void)
9247 if (!current_class_ref)
9250 type = current_class_type;
9251 if (!LAMBDA_TYPE_P (type))
9254 /* Find the nearest enclosing non-lambda function. */
9255 fn = TYPE_NAME (type);
9257 fn = decl_function_context (fn);
9258 while (fn && LAMBDA_FUNCTION_P (fn));
9260 if (!fn || !DECL_NONSTATIC_MEMBER_FUNCTION_P (fn))
9263 return TYPE_METHOD_BASETYPE (TREE_TYPE (fn));
9266 /* If the closure TYPE has a static op(), also add a conversion to function
9270 maybe_add_lambda_conv_op (tree type)
9272 bool nested = (current_function_decl != NULL_TREE);
9273 tree callop = lambda_function (type);
9274 tree rettype, name, fntype, fn, body, compound_stmt;
9275 tree thistype, stattype, statfn, convfn, call, arg;
9276 VEC (tree, gc) *argvec;
9278 if (LAMBDA_EXPR_CAPTURE_LIST (CLASSTYPE_LAMBDA_EXPR (type)) != NULL_TREE)
9281 if (processing_template_decl)
9284 stattype = build_function_type (TREE_TYPE (TREE_TYPE (callop)),
9285 FUNCTION_ARG_CHAIN (callop));
9287 /* First build up the conversion op. */
9289 rettype = build_pointer_type (stattype);
9290 name = mangle_conv_op_name_for_type (rettype);
9291 thistype = cp_build_qualified_type (type, TYPE_QUAL_CONST);
9292 fntype = build_method_type_directly (thistype, rettype, void_list_node);
9293 fn = convfn = build_lang_decl (FUNCTION_DECL, name, fntype);
9294 DECL_SOURCE_LOCATION (fn) = DECL_SOURCE_LOCATION (callop);
9296 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
9297 && DECL_ALIGN (fn) < 2 * BITS_PER_UNIT)
9298 DECL_ALIGN (fn) = 2 * BITS_PER_UNIT;
9300 SET_OVERLOADED_OPERATOR_CODE (fn, TYPE_EXPR);
9301 grokclassfn (type, fn, NO_SPECIAL);
9302 set_linkage_according_to_type (type, fn);
9303 rest_of_decl_compilation (fn, toplevel_bindings_p (), at_eof);
9304 DECL_IN_AGGR_P (fn) = 1;
9305 DECL_ARTIFICIAL (fn) = 1;
9306 DECL_NOT_REALLY_EXTERN (fn) = 1;
9307 DECL_DECLARED_INLINE_P (fn) = 1;
9308 DECL_ARGUMENTS (fn) = build_this_parm (fntype, TYPE_QUAL_CONST);
9310 add_method (type, fn, NULL_TREE);
9312 /* Generic thunk code fails for varargs; we'll complain in mark_used if
9313 the conversion op is used. */
9314 if (varargs_function_p (callop))
9316 DECL_DELETED_FN (fn) = 1;
9320 /* Now build up the thunk to be returned. */
9322 name = get_identifier ("_FUN");
9323 fn = statfn = build_lang_decl (FUNCTION_DECL, name, stattype);
9324 DECL_SOURCE_LOCATION (fn) = DECL_SOURCE_LOCATION (callop);
9325 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
9326 && DECL_ALIGN (fn) < 2 * BITS_PER_UNIT)
9327 DECL_ALIGN (fn) = 2 * BITS_PER_UNIT;
9328 grokclassfn (type, fn, NO_SPECIAL);
9329 set_linkage_according_to_type (type, fn);
9330 rest_of_decl_compilation (fn, toplevel_bindings_p (), at_eof);
9331 DECL_IN_AGGR_P (fn) = 1;
9332 DECL_ARTIFICIAL (fn) = 1;
9333 DECL_NOT_REALLY_EXTERN (fn) = 1;
9334 DECL_DECLARED_INLINE_P (fn) = 1;
9335 DECL_STATIC_FUNCTION_P (fn) = 1;
9336 DECL_ARGUMENTS (fn) = copy_list (DECL_CHAIN (DECL_ARGUMENTS (callop)));
9337 for (arg = DECL_ARGUMENTS (fn); arg; arg = DECL_CHAIN (arg))
9338 DECL_CONTEXT (arg) = fn;
9340 add_method (type, fn, NULL_TREE);
9343 push_function_context ();
9345 /* Still increment function_depth so that we don't GC in the
9346 middle of an expression. */
9349 /* Generate the body of the thunk. */
9351 start_preparsed_function (statfn, NULL_TREE,
9352 SF_PRE_PARSED | SF_INCLASS_INLINE);
9353 if (DECL_ONE_ONLY (statfn))
9355 /* Put the thunk in the same comdat group as the call op. */
9356 cgraph_add_to_same_comdat_group (cgraph_get_create_node (statfn),
9357 cgraph_get_create_node (callop));
9359 body = begin_function_body ();
9360 compound_stmt = begin_compound_stmt (0);
9362 arg = build1 (NOP_EXPR, TREE_TYPE (DECL_ARGUMENTS (callop)),
9364 argvec = make_tree_vector ();
9365 VEC_quick_push (tree, argvec, arg);
9366 for (arg = DECL_ARGUMENTS (statfn); arg; arg = DECL_CHAIN (arg))
9368 mark_exp_read (arg);
9369 VEC_safe_push (tree, gc, argvec, arg);
9371 call = build_call_a (callop, VEC_length (tree, argvec),
9372 VEC_address (tree, argvec));
9373 CALL_FROM_THUNK_P (call) = 1;
9374 if (MAYBE_CLASS_TYPE_P (TREE_TYPE (call)))
9375 call = build_cplus_new (TREE_TYPE (call), call, tf_warning_or_error);
9376 call = convert_from_reference (call);
9377 finish_return_stmt (call);
9379 finish_compound_stmt (compound_stmt);
9380 finish_function_body (body);
9382 expand_or_defer_fn (finish_function (2));
9384 /* Generate the body of the conversion op. */
9386 start_preparsed_function (convfn, NULL_TREE,
9387 SF_PRE_PARSED | SF_INCLASS_INLINE);
9388 body = begin_function_body ();
9389 compound_stmt = begin_compound_stmt (0);
9391 finish_return_stmt (decay_conversion (statfn));
9393 finish_compound_stmt (compound_stmt);
9394 finish_function_body (body);
9396 expand_or_defer_fn (finish_function (2));
9399 pop_function_context ();
9404 /* Returns true iff VAL is a lambda-related declaration which should
9405 be ignored by unqualified lookup. */
9408 is_lambda_ignored_entity (tree val)
9410 /* In unevaluated context, look past normal capture proxies. */
9411 if (cp_unevaluated_operand && is_normal_capture_proxy (val))
9414 /* Always ignore lambda fields, their names are only for debugging. */
9415 if (TREE_CODE (val) == FIELD_DECL
9416 && CLASSTYPE_LAMBDA_EXPR (DECL_CONTEXT (val)))
9419 /* None of the lookups that use qualify_lookup want the op() from the
9420 lambda; they want the one from the enclosing class. */
9421 if (TREE_CODE (val) == FUNCTION_DECL && LAMBDA_FUNCTION_P (val))
9427 #include "gt-cp-semantics.h"