1 /* C++-specific tree lowering bits; see also c-gimplify.c and tree-gimple.c.
3 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
4 Free Software Foundation, Inc.
5 Contributed by Jason Merrill <jason@redhat.com>
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify it under
10 the terms of the GNU General Public License as published by the Free
11 Software Foundation; either version 3, or (at your option) any later
14 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
15 WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
25 #include "coretypes.h"
29 #include "c-family/c-common.h"
31 #include "tree-iterator.h"
34 #include "pointer-set.h"
37 /* Local declarations. */
39 enum bc_t { bc_break = 0, bc_continue = 1 };
41 /* Stack of labels which are targets for "break" or "continue",
42 linked through TREE_CHAIN. */
43 static tree bc_label[2];
45 /* Begin a scope which can be exited by a break or continue statement. BC
48 Just creates a label and pushes it into the current context. */
51 begin_bc_block (enum bc_t bc)
53 tree label = create_artificial_label (input_location);
54 DECL_CHAIN (label) = bc_label[bc];
59 /* Finish a scope which can be exited by a break or continue statement.
60 LABEL was returned from the most recent call to begin_bc_block. BODY is
61 an expression for the contents of the scope.
63 If we saw a break (or continue) in the scope, append a LABEL_EXPR to
64 body. Otherwise, just forget the label. */
67 finish_bc_block (enum bc_t bc, tree label, gimple_seq body)
69 gcc_assert (label == bc_label[bc]);
71 if (TREE_USED (label))
73 gimple_seq_add_stmt (&body, gimple_build_label (label));
76 bc_label[bc] = DECL_CHAIN (label);
77 DECL_CHAIN (label) = NULL_TREE;
81 /* Get the LABEL_EXPR to represent a break or continue statement
82 in the current block scope. BC indicates which. */
85 get_bc_label (enum bc_t bc)
87 tree label = bc_label[bc];
89 if (label == NULL_TREE)
92 error ("break statement not within loop or switch");
94 error ("continue statement not within loop or switch");
99 /* Mark the label used for finish_bc_block. */
100 TREE_USED (label) = 1;
104 /* Genericize a TRY_BLOCK. */
107 genericize_try_block (tree *stmt_p)
109 tree body = TRY_STMTS (*stmt_p);
110 tree cleanup = TRY_HANDLERS (*stmt_p);
112 *stmt_p = build2 (TRY_CATCH_EXPR, void_type_node, body, cleanup);
115 /* Genericize a HANDLER by converting to a CATCH_EXPR. */
118 genericize_catch_block (tree *stmt_p)
120 tree type = HANDLER_TYPE (*stmt_p);
121 tree body = HANDLER_BODY (*stmt_p);
123 /* FIXME should the caught type go in TREE_TYPE? */
124 *stmt_p = build2 (CATCH_EXPR, void_type_node, type, body);
127 /* A terser interface for building a representation of an exception
131 build_gimple_eh_filter_tree (tree body, tree allowed, tree failure)
135 /* FIXME should the allowed types go in TREE_TYPE? */
136 t = build2 (EH_FILTER_EXPR, void_type_node, allowed, NULL_TREE);
137 append_to_statement_list (failure, &EH_FILTER_FAILURE (t));
139 t = build2 (TRY_CATCH_EXPR, void_type_node, NULL_TREE, t);
140 append_to_statement_list (body, &TREE_OPERAND (t, 0));
145 /* Genericize an EH_SPEC_BLOCK by converting it to a
146 TRY_CATCH_EXPR/EH_FILTER_EXPR pair. */
149 genericize_eh_spec_block (tree *stmt_p)
151 tree body = EH_SPEC_STMTS (*stmt_p);
152 tree allowed = EH_SPEC_RAISES (*stmt_p);
153 tree failure = build_call_n (call_unexpected_node, 1, build_exc_ptr ());
155 *stmt_p = build_gimple_eh_filter_tree (body, allowed, failure);
156 TREE_NO_WARNING (*stmt_p) = true;
157 TREE_NO_WARNING (TREE_OPERAND (*stmt_p, 1)) = true;
160 /* Genericize an IF_STMT by turning it into a COND_EXPR. */
163 genericize_if_stmt (tree *stmt_p)
165 tree stmt, cond, then_, else_;
166 location_t locus = EXPR_LOCATION (*stmt_p);
169 cond = IF_COND (stmt);
170 then_ = THEN_CLAUSE (stmt);
171 else_ = ELSE_CLAUSE (stmt);
174 then_ = build_empty_stmt (locus);
176 else_ = build_empty_stmt (locus);
178 if (integer_nonzerop (cond) && !TREE_SIDE_EFFECTS (else_))
180 else if (integer_zerop (cond) && !TREE_SIDE_EFFECTS (then_))
183 stmt = build3 (COND_EXPR, void_type_node, cond, then_, else_);
184 if (CAN_HAVE_LOCATION_P (stmt) && !EXPR_HAS_LOCATION (stmt))
185 SET_EXPR_LOCATION (stmt, locus);
189 /* Build a generic representation of one of the C loop forms. COND is the
190 loop condition or NULL_TREE. BODY is the (possibly compound) statement
191 controlled by the loop. INCR is the increment expression of a for-loop,
192 or NULL_TREE. COND_IS_FIRST indicates whether the condition is
193 evaluated before the loop body as in while and for loops, or after the
194 loop body as in do-while loops. */
197 gimplify_cp_loop (tree cond, tree body, tree incr, bool cond_is_first)
199 gimple top, entry, stmt;
200 gimple_seq stmt_list, body_seq, incr_seq, exit_seq;
201 tree cont_block, break_block;
202 location_t stmt_locus;
204 stmt_locus = input_location;
211 break_block = begin_bc_block (bc_break);
212 cont_block = begin_bc_block (bc_continue);
214 /* If condition is zero don't generate a loop construct. */
215 if (cond && integer_zerop (cond))
220 stmt = gimple_build_goto (get_bc_label (bc_break));
221 gimple_set_location (stmt, stmt_locus);
222 gimple_seq_add_stmt (&stmt_list, stmt);
227 /* If we use a LOOP_EXPR here, we have to feed the whole thing
228 back through the main gimplifier to lower it. Given that we
229 have to gimplify the loop body NOW so that we can resolve
230 break/continue stmts, seems easier to just expand to gotos. */
231 top = gimple_build_label (create_artificial_label (stmt_locus));
233 /* If we have an exit condition, then we build an IF with gotos either
234 out of the loop, or to the top of it. If there's no exit condition,
235 then we just build a jump back to the top. */
236 if (cond && !integer_nonzerop (cond))
238 if (cond != error_mark_node)
240 gimplify_expr (&cond, &exit_seq, NULL, is_gimple_val, fb_rvalue);
241 stmt = gimple_build_cond (NE_EXPR, cond,
242 build_int_cst (TREE_TYPE (cond), 0),
243 gimple_label_label (top),
244 get_bc_label (bc_break));
245 gimple_seq_add_stmt (&exit_seq, stmt);
252 entry = gimple_build_label
253 (create_artificial_label (stmt_locus));
254 stmt = gimple_build_goto (gimple_label_label (entry));
257 stmt = gimple_build_goto (get_bc_label (bc_continue));
258 gimple_set_location (stmt, stmt_locus);
259 gimple_seq_add_stmt (&stmt_list, stmt);
264 stmt = gimple_build_goto (gimple_label_label (top));
265 gimple_seq_add_stmt (&exit_seq, stmt);
269 gimplify_stmt (&body, &body_seq);
270 gimplify_stmt (&incr, &incr_seq);
272 body_seq = finish_bc_block (bc_continue, cont_block, body_seq);
274 gimple_seq_add_stmt (&stmt_list, top);
275 gimple_seq_add_seq (&stmt_list, body_seq);
276 gimple_seq_add_seq (&stmt_list, incr_seq);
277 gimple_seq_add_stmt (&stmt_list, entry);
278 gimple_seq_add_seq (&stmt_list, exit_seq);
280 annotate_all_with_location (stmt_list, stmt_locus);
282 return finish_bc_block (bc_break, break_block, stmt_list);
285 /* Gimplify a FOR_STMT node. Move the stuff in the for-init-stmt into the
286 prequeue and hand off to gimplify_cp_loop. */
289 gimplify_for_stmt (tree *stmt_p, gimple_seq *pre_p)
293 if (FOR_INIT_STMT (stmt))
294 gimplify_and_add (FOR_INIT_STMT (stmt), pre_p);
296 gimple_seq_add_seq (pre_p,
297 gimplify_cp_loop (FOR_COND (stmt), FOR_BODY (stmt),
298 FOR_EXPR (stmt), 1));
302 /* Gimplify a WHILE_STMT node. */
305 gimplify_while_stmt (tree *stmt_p, gimple_seq *pre_p)
308 gimple_seq_add_seq (pre_p,
309 gimplify_cp_loop (WHILE_COND (stmt), WHILE_BODY (stmt),
314 /* Gimplify a DO_STMT node. */
317 gimplify_do_stmt (tree *stmt_p, gimple_seq *pre_p)
320 gimple_seq_add_seq (pre_p,
321 gimplify_cp_loop (DO_COND (stmt), DO_BODY (stmt),
326 /* Genericize a SWITCH_STMT by turning it into a SWITCH_EXPR. */
329 gimplify_switch_stmt (tree *stmt_p, gimple_seq *pre_p)
332 tree break_block, body, t;
333 location_t stmt_locus = input_location;
334 gimple_seq seq = NULL;
336 break_block = begin_bc_block (bc_break);
338 body = SWITCH_STMT_BODY (stmt);
340 body = build_empty_stmt (stmt_locus);
342 t = build3 (SWITCH_EXPR, SWITCH_STMT_TYPE (stmt),
343 SWITCH_STMT_COND (stmt), body, NULL_TREE);
344 SET_EXPR_LOCATION (t, stmt_locus);
345 gimplify_and_add (t, &seq);
347 seq = finish_bc_block (bc_break, break_block, seq);
348 gimple_seq_add_seq (pre_p, seq);
352 /* Hook into the middle of gimplifying an OMP_FOR node. This is required
353 in order to properly gimplify CONTINUE statements. Here we merely
354 manage the continue stack; the rest of the job is performed by the
355 regular gimplifier. */
357 static enum gimplify_status
358 cp_gimplify_omp_for (tree *expr_p, gimple_seq *pre_p)
360 tree for_stmt = *expr_p;
363 gimple_seq seq = NULL;
365 /* Protect ourselves from recursion. */
366 if (OMP_FOR_GIMPLIFYING_P (for_stmt))
368 OMP_FOR_GIMPLIFYING_P (for_stmt) = 1;
370 /* Note that while technically the continue label is enabled too soon
371 here, we should have already diagnosed invalid continues nested within
372 statement expressions within the INIT, COND, or INCR expressions. */
373 cont_block = begin_bc_block (bc_continue);
375 gimplify_and_add (for_stmt, &seq);
376 stmt = gimple_seq_last_stmt (seq);
377 if (gimple_code (stmt) == GIMPLE_OMP_FOR)
378 gimple_omp_set_body (stmt, finish_bc_block (bc_continue, cont_block,
379 gimple_omp_body (stmt)));
381 seq = finish_bc_block (bc_continue, cont_block, seq);
382 gimple_seq_add_seq (pre_p, seq);
384 OMP_FOR_GIMPLIFYING_P (for_stmt) = 0;
389 /* Gimplify an EXPR_STMT node. */
392 gimplify_expr_stmt (tree *stmt_p)
394 tree stmt = EXPR_STMT_EXPR (*stmt_p);
396 if (stmt == error_mark_node)
399 /* Gimplification of a statement expression will nullify the
400 statement if all its side effects are moved to *PRE_P and *POST_P.
402 In this case we will not want to emit the gimplified statement.
403 However, we may still want to emit a warning, so we do that before
405 if (stmt && warn_unused_value)
407 if (!TREE_SIDE_EFFECTS (stmt))
409 if (!IS_EMPTY_STMT (stmt)
410 && !VOID_TYPE_P (TREE_TYPE (stmt))
411 && !TREE_NO_WARNING (stmt))
412 warning (OPT_Wunused_value, "statement with no effect");
415 warn_if_unused_value (stmt, input_location);
418 if (stmt == NULL_TREE)
419 stmt = alloc_stmt_list ();
424 /* Gimplify initialization from an AGGR_INIT_EXPR. */
427 cp_gimplify_init_expr (tree *expr_p, gimple_seq *pre_p, gimple_seq *post_p)
429 tree from = TREE_OPERAND (*expr_p, 1);
430 tree to = TREE_OPERAND (*expr_p, 0);
433 /* What about code that pulls out the temp and uses it elsewhere? I
434 think that such code never uses the TARGET_EXPR as an initializer. If
435 I'm wrong, we'll abort because the temp won't have any RTL. In that
436 case, I guess we'll need to replace references somehow. */
437 if (TREE_CODE (from) == TARGET_EXPR)
438 from = TARGET_EXPR_INITIAL (from);
440 /* Look through any COMPOUND_EXPRs, since build_compound_expr pushes them
441 inside the TARGET_EXPR. */
444 tree sub = TREE_CODE (t) == COMPOUND_EXPR ? TREE_OPERAND (t, 0) : t;
446 /* If we are initializing from an AGGR_INIT_EXPR, drop the INIT_EXPR and
447 replace the slot operand with our target.
449 Should we add a target parm to gimplify_expr instead? No, as in this
450 case we want to replace the INIT_EXPR. */
451 if (TREE_CODE (sub) == AGGR_INIT_EXPR
452 || TREE_CODE (sub) == VEC_INIT_EXPR)
454 gimplify_expr (&to, pre_p, post_p, is_gimple_lvalue, fb_lvalue);
455 if (TREE_CODE (sub) == AGGR_INIT_EXPR)
456 AGGR_INIT_EXPR_SLOT (sub) = to;
458 VEC_INIT_EXPR_SLOT (sub) = to;
461 /* The initialization is now a side-effect, so the container can
464 TREE_TYPE (from) = void_type_node;
470 t = TREE_OPERAND (t, 1);
475 /* Gimplify a MUST_NOT_THROW_EXPR. */
477 static enum gimplify_status
478 gimplify_must_not_throw_expr (tree *expr_p, gimple_seq *pre_p)
481 tree temp = voidify_wrapper_expr (stmt, NULL);
482 tree body = TREE_OPERAND (stmt, 0);
483 gimple_seq try_ = NULL;
484 gimple_seq catch_ = NULL;
487 gimplify_and_add (body, &try_);
488 mnt = gimple_build_eh_must_not_throw (terminate_node);
489 gimplify_seq_add_stmt (&catch_, mnt);
490 mnt = gimple_build_try (try_, catch_, GIMPLE_TRY_CATCH);
492 gimplify_seq_add_stmt (pre_p, mnt);
503 /* Do C++-specific gimplification. Args are as for gimplify_expr. */
506 cp_gimplify_expr (tree *expr_p, gimple_seq *pre_p, gimple_seq *post_p)
508 int saved_stmts_are_full_exprs_p = 0;
509 enum tree_code code = TREE_CODE (*expr_p);
510 enum gimplify_status ret;
512 if (STATEMENT_CODE_P (code))
514 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
515 current_stmt_tree ()->stmts_are_full_exprs_p
516 = STMT_IS_FULL_EXPR_P (*expr_p);
522 *expr_p = cplus_expand_constant (*expr_p);
527 simplify_aggr_init_expr (expr_p);
533 location_t loc = input_location;
534 gcc_assert (EXPR_HAS_LOCATION (*expr_p));
535 input_location = EXPR_LOCATION (*expr_p);
536 *expr_p = build_vec_init (VEC_INIT_EXPR_SLOT (*expr_p), NULL_TREE,
537 VEC_INIT_EXPR_INIT (*expr_p), false, 1,
538 tf_warning_or_error);
540 input_location = loc;
545 /* FIXME communicate throw type to back end, probably by moving
546 THROW_EXPR into ../tree.def. */
547 *expr_p = TREE_OPERAND (*expr_p, 0);
551 case MUST_NOT_THROW_EXPR:
552 ret = gimplify_must_not_throw_expr (expr_p, pre_p);
555 /* We used to do this for MODIFY_EXPR as well, but that's unsafe; the
556 LHS of an assignment might also be involved in the RHS, as in bug
559 cp_gimplify_init_expr (expr_p, pre_p, post_p);
560 if (TREE_CODE (*expr_p) != INIT_EXPR)
562 /* Otherwise fall through. */
565 /* If the back end isn't clever enough to know that the lhs and rhs
566 types are the same, add an explicit conversion. */
567 tree op0 = TREE_OPERAND (*expr_p, 0);
568 tree op1 = TREE_OPERAND (*expr_p, 1);
570 if (!error_operand_p (op0)
571 && !error_operand_p (op1)
572 && (TYPE_STRUCTURAL_EQUALITY_P (TREE_TYPE (op0))
573 || TYPE_STRUCTURAL_EQUALITY_P (TREE_TYPE (op1)))
574 && !useless_type_conversion_p (TREE_TYPE (op1), TREE_TYPE (op0)))
575 TREE_OPERAND (*expr_p, 1) = build1 (VIEW_CONVERT_EXPR,
576 TREE_TYPE (op0), op1);
578 else if ((is_gimple_lvalue (op1) || INDIRECT_REF_P (op1)
579 || (TREE_CODE (op1) == CONSTRUCTOR
580 && CONSTRUCTOR_NELTS (op1) == 0)
581 || (TREE_CODE (op1) == CALL_EXPR
582 && !CALL_EXPR_RETURN_SLOT_OPT (op1)))
583 && is_really_empty_class (TREE_TYPE (op0)))
585 /* Remove any copies of empty classes. We check that the RHS
586 has a simple form so that TARGET_EXPRs and non-empty
587 CONSTRUCTORs get reduced properly, and we leave the return
588 slot optimization alone because it isn't a copy (FIXME so it
589 shouldn't be represented as one).
591 Also drop volatile variables on the RHS to avoid infinite
592 recursion from gimplify_expr trying to load the value. */
593 if (!TREE_SIDE_EFFECTS (op1)
594 || (DECL_P (op1) && TREE_THIS_VOLATILE (op1)))
597 *expr_p = build2 (COMPOUND_EXPR, TREE_TYPE (*expr_p),
604 case EMPTY_CLASS_EXPR:
605 /* We create an empty CONSTRUCTOR with RECORD_TYPE. */
606 *expr_p = build_constructor (TREE_TYPE (*expr_p), NULL);
611 *expr_p = BASELINK_FUNCTIONS (*expr_p);
616 genericize_try_block (expr_p);
621 genericize_catch_block (expr_p);
626 genericize_eh_spec_block (expr_p);
634 gimplify_for_stmt (expr_p, pre_p);
639 gimplify_while_stmt (expr_p, pre_p);
644 gimplify_do_stmt (expr_p, pre_p);
649 gimplify_switch_stmt (expr_p, pre_p);
654 ret = cp_gimplify_omp_for (expr_p, pre_p);
658 gimple_seq_add_stmt (pre_p, gimple_build_predict (PRED_CONTINUE, NOT_TAKEN));
659 gimple_seq_add_stmt (pre_p, gimple_build_goto (get_bc_label (bc_continue)));
665 gimple_seq_add_stmt (pre_p, gimple_build_goto (get_bc_label (bc_break)));
671 gimplify_expr_stmt (expr_p);
675 case UNARY_PLUS_EXPR:
677 tree arg = TREE_OPERAND (*expr_p, 0);
678 tree type = TREE_TYPE (*expr_p);
679 *expr_p = (TREE_TYPE (arg) != type) ? fold_convert (type, arg)
686 ret = (enum gimplify_status) c_gimplify_expr (expr_p, pre_p, post_p);
690 /* Restore saved state. */
691 if (STATEMENT_CODE_P (code))
692 current_stmt_tree ()->stmts_are_full_exprs_p
693 = saved_stmts_are_full_exprs_p;
699 is_invisiref_parm (const_tree t)
701 return ((TREE_CODE (t) == PARM_DECL || TREE_CODE (t) == RESULT_DECL)
702 && DECL_BY_REFERENCE (t));
705 /* Return true if the uid in both int tree maps are equal. */
708 cxx_int_tree_map_eq (const void *va, const void *vb)
710 const struct cxx_int_tree_map *a = (const struct cxx_int_tree_map *) va;
711 const struct cxx_int_tree_map *b = (const struct cxx_int_tree_map *) vb;
712 return (a->uid == b->uid);
715 /* Hash a UID in a cxx_int_tree_map. */
718 cxx_int_tree_map_hash (const void *item)
720 return ((const struct cxx_int_tree_map *)item)->uid;
723 struct cp_genericize_data
725 struct pointer_set_t *p_set;
726 VEC (tree, heap) *bind_expr_stack;
729 /* Perform any pre-gimplification lowering of C++ front end trees to
733 cp_genericize_r (tree *stmt_p, int *walk_subtrees, void *data)
736 struct cp_genericize_data *wtd = (struct cp_genericize_data *) data;
737 struct pointer_set_t *p_set = wtd->p_set;
739 if (is_invisiref_parm (stmt)
740 /* Don't dereference parms in a thunk, pass the references through. */
741 && !(DECL_THUNK_P (current_function_decl)
742 && TREE_CODE (stmt) == PARM_DECL))
744 *stmt_p = convert_from_reference (stmt);
749 /* Map block scope extern declarations to visible declarations with the
750 same name and type in outer scopes if any. */
751 if (cp_function_chain->extern_decl_map
752 && (TREE_CODE (stmt) == FUNCTION_DECL || TREE_CODE (stmt) == VAR_DECL)
753 && DECL_EXTERNAL (stmt))
755 struct cxx_int_tree_map *h, in;
756 in.uid = DECL_UID (stmt);
757 h = (struct cxx_int_tree_map *)
758 htab_find_with_hash (cp_function_chain->extern_decl_map,
768 /* Other than invisiref parms, don't walk the same tree twice. */
769 if (pointer_set_contains (p_set, stmt))
775 if (TREE_CODE (stmt) == ADDR_EXPR
776 && is_invisiref_parm (TREE_OPERAND (stmt, 0)))
778 *stmt_p = convert (TREE_TYPE (stmt), TREE_OPERAND (stmt, 0));
781 else if (TREE_CODE (stmt) == RETURN_EXPR
782 && TREE_OPERAND (stmt, 0)
783 && is_invisiref_parm (TREE_OPERAND (stmt, 0)))
784 /* Don't dereference an invisiref RESULT_DECL inside a RETURN_EXPR. */
786 else if (TREE_CODE (stmt) == OMP_CLAUSE)
787 switch (OMP_CLAUSE_CODE (stmt))
789 case OMP_CLAUSE_LASTPRIVATE:
790 /* Don't dereference an invisiref in OpenMP clauses. */
791 if (is_invisiref_parm (OMP_CLAUSE_DECL (stmt)))
794 if (OMP_CLAUSE_LASTPRIVATE_STMT (stmt))
795 cp_walk_tree (&OMP_CLAUSE_LASTPRIVATE_STMT (stmt),
796 cp_genericize_r, data, NULL);
799 case OMP_CLAUSE_PRIVATE:
800 case OMP_CLAUSE_SHARED:
801 case OMP_CLAUSE_FIRSTPRIVATE:
802 case OMP_CLAUSE_COPYIN:
803 case OMP_CLAUSE_COPYPRIVATE:
804 /* Don't dereference an invisiref in OpenMP clauses. */
805 if (is_invisiref_parm (OMP_CLAUSE_DECL (stmt)))
808 case OMP_CLAUSE_REDUCTION:
809 gcc_assert (!is_invisiref_parm (OMP_CLAUSE_DECL (stmt)));
814 else if (IS_TYPE_OR_DECL_P (stmt))
817 /* Due to the way voidify_wrapper_expr is written, we don't get a chance
818 to lower this construct before scanning it, so we need to lower these
819 before doing anything else. */
820 else if (TREE_CODE (stmt) == CLEANUP_STMT)
821 *stmt_p = build2 (CLEANUP_EH_ONLY (stmt) ? TRY_CATCH_EXPR
825 CLEANUP_EXPR (stmt));
827 else if (TREE_CODE (stmt) == IF_STMT)
829 genericize_if_stmt (stmt_p);
830 /* *stmt_p has changed, tail recurse to handle it again. */
831 return cp_genericize_r (stmt_p, walk_subtrees, data);
834 /* COND_EXPR might have incompatible types in branches if one or both
835 arms are bitfields. Fix it up now. */
836 else if (TREE_CODE (stmt) == COND_EXPR)
839 = (TREE_OPERAND (stmt, 1)
840 ? is_bitfield_expr_with_lowered_type (TREE_OPERAND (stmt, 1))
843 = (TREE_OPERAND (stmt, 2)
844 ? is_bitfield_expr_with_lowered_type (TREE_OPERAND (stmt, 2))
847 && !useless_type_conversion_p (TREE_TYPE (stmt),
848 TREE_TYPE (TREE_OPERAND (stmt, 1))))
850 TREE_OPERAND (stmt, 1)
851 = fold_convert (type_left, TREE_OPERAND (stmt, 1));
852 gcc_assert (useless_type_conversion_p (TREE_TYPE (stmt),
856 && !useless_type_conversion_p (TREE_TYPE (stmt),
857 TREE_TYPE (TREE_OPERAND (stmt, 2))))
859 TREE_OPERAND (stmt, 2)
860 = fold_convert (type_right, TREE_OPERAND (stmt, 2));
861 gcc_assert (useless_type_conversion_p (TREE_TYPE (stmt),
866 else if (TREE_CODE (stmt) == BIND_EXPR)
868 VEC_safe_push (tree, heap, wtd->bind_expr_stack, stmt);
869 cp_walk_tree (&BIND_EXPR_BODY (stmt),
870 cp_genericize_r, data, NULL);
871 VEC_pop (tree, wtd->bind_expr_stack);
874 else if (TREE_CODE (stmt) == USING_STMT)
876 tree block = NULL_TREE;
878 /* Get the innermost inclosing GIMPLE_BIND that has a non NULL
879 BLOCK, and append an IMPORTED_DECL to its
880 BLOCK_VARS chained list. */
881 if (wtd->bind_expr_stack)
884 for (i = VEC_length (tree, wtd->bind_expr_stack) - 1; i >= 0; i--)
885 if ((block = BIND_EXPR_BLOCK (VEC_index (tree,
886 wtd->bind_expr_stack, i))))
891 tree using_directive;
892 gcc_assert (TREE_OPERAND (stmt, 0));
894 using_directive = make_node (IMPORTED_DECL);
895 TREE_TYPE (using_directive) = void_type_node;
897 IMPORTED_DECL_ASSOCIATED_DECL (using_directive)
898 = TREE_OPERAND (stmt, 0);
899 DECL_CHAIN (using_directive) = BLOCK_VARS (block);
900 BLOCK_VARS (block) = using_directive;
902 /* The USING_STMT won't appear in GENERIC. */
903 *stmt_p = build1 (NOP_EXPR, void_type_node, integer_zero_node);
907 else if (TREE_CODE (stmt) == DECL_EXPR
908 && TREE_CODE (DECL_EXPR_DECL (stmt)) == USING_DECL)
910 /* Using decls inside DECL_EXPRs are just dropped on the floor. */
911 *stmt_p = build1 (NOP_EXPR, void_type_node, integer_zero_node);
915 pointer_set_insert (p_set, *stmt_p);
921 cp_genericize (tree fndecl)
924 struct cp_genericize_data wtd;
926 /* Fix up the types of parms passed by invisible reference. */
927 for (t = DECL_ARGUMENTS (fndecl); t; t = DECL_CHAIN (t))
928 if (TREE_ADDRESSABLE (TREE_TYPE (t)))
930 /* If a function's arguments are copied to create a thunk,
931 then DECL_BY_REFERENCE will be set -- but the type of the
932 argument will be a pointer type, so we will never get
934 gcc_assert (!DECL_BY_REFERENCE (t));
935 gcc_assert (DECL_ARG_TYPE (t) != TREE_TYPE (t));
936 TREE_TYPE (t) = DECL_ARG_TYPE (t);
937 DECL_BY_REFERENCE (t) = 1;
938 TREE_ADDRESSABLE (t) = 0;
942 /* Do the same for the return value. */
943 if (TREE_ADDRESSABLE (TREE_TYPE (DECL_RESULT (fndecl))))
945 t = DECL_RESULT (fndecl);
946 TREE_TYPE (t) = build_reference_type (TREE_TYPE (t));
947 DECL_BY_REFERENCE (t) = 1;
948 TREE_ADDRESSABLE (t) = 0;
952 /* If we're a clone, the body is already GIMPLE. */
953 if (DECL_CLONED_FUNCTION_P (fndecl))
956 /* We do want to see every occurrence of the parms, so we can't just use
957 walk_tree's hash functionality. */
958 wtd.p_set = pointer_set_create ();
959 wtd.bind_expr_stack = NULL;
960 cp_walk_tree (&DECL_SAVED_TREE (fndecl), cp_genericize_r, &wtd, NULL);
961 pointer_set_destroy (wtd.p_set);
962 VEC_free (tree, heap, wtd.bind_expr_stack);
964 /* Do everything else. */
965 c_genericize (fndecl);
967 gcc_assert (bc_label[bc_break] == NULL);
968 gcc_assert (bc_label[bc_continue] == NULL);
971 /* Build code to apply FN to each member of ARG1 and ARG2. FN may be
972 NULL if there is in fact nothing to do. ARG2 may be null if FN
973 actually only takes one argument. */
976 cxx_omp_clause_apply_fn (tree fn, tree arg1, tree arg2)
978 tree defparm, parm, t;
986 nargs = list_length (DECL_ARGUMENTS (fn));
987 argarray = XALLOCAVEC (tree, nargs);
989 defparm = TREE_CHAIN (TYPE_ARG_TYPES (TREE_TYPE (fn)));
991 defparm = TREE_CHAIN (defparm);
993 if (TREE_CODE (TREE_TYPE (arg1)) == ARRAY_TYPE)
995 tree inner_type = TREE_TYPE (arg1);
996 tree start1, end1, p1;
997 tree start2 = NULL, p2 = NULL;
998 tree ret = NULL, lab;
1004 inner_type = TREE_TYPE (inner_type);
1005 start1 = build4 (ARRAY_REF, inner_type, start1,
1006 size_zero_node, NULL, NULL);
1008 start2 = build4 (ARRAY_REF, inner_type, start2,
1009 size_zero_node, NULL, NULL);
1011 while (TREE_CODE (inner_type) == ARRAY_TYPE);
1012 start1 = build_fold_addr_expr_loc (input_location, start1);
1014 start2 = build_fold_addr_expr_loc (input_location, start2);
1016 end1 = TYPE_SIZE_UNIT (TREE_TYPE (arg1));
1017 end1 = build2 (POINTER_PLUS_EXPR, TREE_TYPE (start1), start1, end1);
1019 p1 = create_tmp_var (TREE_TYPE (start1), NULL);
1020 t = build2 (MODIFY_EXPR, TREE_TYPE (p1), p1, start1);
1021 append_to_statement_list (t, &ret);
1025 p2 = create_tmp_var (TREE_TYPE (start2), NULL);
1026 t = build2 (MODIFY_EXPR, TREE_TYPE (p2), p2, start2);
1027 append_to_statement_list (t, &ret);
1030 lab = create_artificial_label (input_location);
1031 t = build1 (LABEL_EXPR, void_type_node, lab);
1032 append_to_statement_list (t, &ret);
1037 /* Handle default arguments. */
1038 for (parm = defparm; parm && parm != void_list_node;
1039 parm = TREE_CHAIN (parm), i++)
1040 argarray[i] = convert_default_arg (TREE_VALUE (parm),
1041 TREE_PURPOSE (parm), fn, i);
1042 t = build_call_a (fn, i, argarray);
1043 t = fold_convert (void_type_node, t);
1044 t = fold_build_cleanup_point_expr (TREE_TYPE (t), t);
1045 append_to_statement_list (t, &ret);
1047 t = TYPE_SIZE_UNIT (inner_type);
1048 t = build2 (POINTER_PLUS_EXPR, TREE_TYPE (p1), p1, t);
1049 t = build2 (MODIFY_EXPR, TREE_TYPE (p1), p1, t);
1050 append_to_statement_list (t, &ret);
1054 t = TYPE_SIZE_UNIT (inner_type);
1055 t = build2 (POINTER_PLUS_EXPR, TREE_TYPE (p2), p2, t);
1056 t = build2 (MODIFY_EXPR, TREE_TYPE (p2), p2, t);
1057 append_to_statement_list (t, &ret);
1060 t = build2 (NE_EXPR, boolean_type_node, p1, end1);
1061 t = build3 (COND_EXPR, void_type_node, t, build_and_jump (&lab), NULL);
1062 append_to_statement_list (t, &ret);
1068 argarray[i++] = build_fold_addr_expr_loc (input_location, arg1);
1070 argarray[i++] = build_fold_addr_expr_loc (input_location, arg2);
1071 /* Handle default arguments. */
1072 for (parm = defparm; parm && parm != void_list_node;
1073 parm = TREE_CHAIN (parm), i++)
1074 argarray[i] = convert_default_arg (TREE_VALUE (parm),
1075 TREE_PURPOSE (parm),
1077 t = build_call_a (fn, i, argarray);
1078 t = fold_convert (void_type_node, t);
1079 return fold_build_cleanup_point_expr (TREE_TYPE (t), t);
1083 /* Return code to initialize DECL with its default constructor, or
1084 NULL if there's nothing to do. */
1087 cxx_omp_clause_default_ctor (tree clause, tree decl,
1088 tree outer ATTRIBUTE_UNUSED)
1090 tree info = CP_OMP_CLAUSE_INFO (clause);
1094 ret = cxx_omp_clause_apply_fn (TREE_VEC_ELT (info, 0), decl, NULL);
1099 /* Return code to initialize DST with a copy constructor from SRC. */
1102 cxx_omp_clause_copy_ctor (tree clause, tree dst, tree src)
1104 tree info = CP_OMP_CLAUSE_INFO (clause);
1108 ret = cxx_omp_clause_apply_fn (TREE_VEC_ELT (info, 0), dst, src);
1110 ret = build2 (MODIFY_EXPR, TREE_TYPE (dst), dst, src);
1115 /* Similarly, except use an assignment operator instead. */
1118 cxx_omp_clause_assign_op (tree clause, tree dst, tree src)
1120 tree info = CP_OMP_CLAUSE_INFO (clause);
1124 ret = cxx_omp_clause_apply_fn (TREE_VEC_ELT (info, 2), dst, src);
1126 ret = build2 (MODIFY_EXPR, TREE_TYPE (dst), dst, src);
1131 /* Return code to destroy DECL. */
1134 cxx_omp_clause_dtor (tree clause, tree decl)
1136 tree info = CP_OMP_CLAUSE_INFO (clause);
1140 ret = cxx_omp_clause_apply_fn (TREE_VEC_ELT (info, 1), decl, NULL);
1145 /* True if OpenMP should privatize what this DECL points to rather
1146 than the DECL itself. */
1149 cxx_omp_privatize_by_reference (const_tree decl)
1151 return is_invisiref_parm (decl);
1154 /* True if OpenMP sharing attribute of DECL is predetermined. */
1156 enum omp_clause_default_kind
1157 cxx_omp_predetermined_sharing (tree decl)
1161 /* Static data members are predetermined as shared. */
1162 if (TREE_STATIC (decl))
1164 tree ctx = CP_DECL_CONTEXT (decl);
1165 if (TYPE_P (ctx) && MAYBE_CLASS_TYPE_P (ctx))
1166 return OMP_CLAUSE_DEFAULT_SHARED;
1169 type = TREE_TYPE (decl);
1170 if (TREE_CODE (type) == REFERENCE_TYPE)
1172 if (!is_invisiref_parm (decl))
1173 return OMP_CLAUSE_DEFAULT_UNSPECIFIED;
1174 type = TREE_TYPE (type);
1176 if (TREE_CODE (decl) == RESULT_DECL && DECL_NAME (decl))
1178 /* NVR doesn't preserve const qualification of the
1180 tree outer = outer_curly_brace_block (current_function_decl);
1184 for (var = BLOCK_VARS (outer); var; var = DECL_CHAIN (var))
1185 if (DECL_NAME (decl) == DECL_NAME (var)
1186 && (TYPE_MAIN_VARIANT (type)
1187 == TYPE_MAIN_VARIANT (TREE_TYPE (var))))
1189 if (TYPE_READONLY (TREE_TYPE (var)))
1190 type = TREE_TYPE (var);
1196 if (type == error_mark_node)
1197 return OMP_CLAUSE_DEFAULT_UNSPECIFIED;
1199 /* Variables with const-qualified type having no mutable member
1200 are predetermined shared. */
1201 if (TYPE_READONLY (type) && !cp_has_mutable_p (type))
1202 return OMP_CLAUSE_DEFAULT_SHARED;
1204 return OMP_CLAUSE_DEFAULT_UNSPECIFIED;
1207 /* Finalize an implicitly determined clause. */
1210 cxx_omp_finish_clause (tree c)
1212 tree decl, inner_type;
1213 bool make_shared = false;
1215 if (OMP_CLAUSE_CODE (c) != OMP_CLAUSE_FIRSTPRIVATE)
1218 decl = OMP_CLAUSE_DECL (c);
1219 decl = require_complete_type (decl);
1220 inner_type = TREE_TYPE (decl);
1221 if (decl == error_mark_node)
1223 else if (TREE_CODE (TREE_TYPE (decl)) == REFERENCE_TYPE)
1225 if (is_invisiref_parm (decl))
1226 inner_type = TREE_TYPE (inner_type);
1229 error ("%qE implicitly determined as %<firstprivate%> has reference type",
1235 /* We're interested in the base element, not arrays. */
1236 while (TREE_CODE (inner_type) == ARRAY_TYPE)
1237 inner_type = TREE_TYPE (inner_type);
1239 /* Check for special function availability by building a call to one.
1240 Save the results, because later we won't be in the right context
1241 for making these queries. */
1243 && CLASS_TYPE_P (inner_type)
1244 && cxx_omp_create_clause_info (c, inner_type, false, true, false))
1248 OMP_CLAUSE_CODE (c) = OMP_CLAUSE_SHARED;