1 /* Tree lowering pass. This pass converts the GENERIC functions-as-trees
2 tree representation into the GIMPLE form.
3 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007
4 Free Software Foundation, Inc.
5 Major work done by Sebastian Pop <s.pop@laposte.net>,
6 Diego Novillo <dnovillo@redhat.com> and Jason Merrill <jason@redhat.com>.
8 This file is part of GCC.
10 GCC is free software; you can redistribute it and/or modify it under
11 the terms of the GNU General Public License as published by the Free
12 Software Foundation; either version 2, or (at your option) any later
15 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
16 WARRANTY; without even the implied warranty of MERCHANTABILITY or
17 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
20 You should have received a copy of the GNU General Public License
21 along with GCC; see the file COPYING. If not, write to the Free
22 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
27 #include "coretypes.h"
32 #include "tree-gimple.h"
33 #include "tree-inline.h"
34 #include "diagnostic.h"
35 #include "langhooks.h"
36 #include "langhooks-def.h"
37 #include "tree-flow.h"
51 #include "pointer-set.h"
52 #include "splay-tree.h"
55 enum gimplify_omp_var_data
61 GOVD_FIRSTPRIVATE = 16,
62 GOVD_LASTPRIVATE = 32,
65 GOVD_DEBUG_PRIVATE = 256,
66 GOVD_DATA_SHARE_CLASS = (GOVD_SHARED | GOVD_PRIVATE | GOVD_FIRSTPRIVATE
67 | GOVD_LASTPRIVATE | GOVD_REDUCTION | GOVD_LOCAL)
70 struct gimplify_omp_ctx
72 struct gimplify_omp_ctx *outer_context;
74 struct pointer_set_t *privatized_types;
76 enum omp_clause_default_kind default_kind;
78 bool is_combined_parallel;
83 struct gimplify_ctx *prev_context;
85 tree current_bind_expr;
87 tree conditional_cleanups;
91 VEC(tree,heap) *case_labels;
92 /* The formal temporary table. Should this be persistent? */
100 static struct gimplify_ctx *gimplify_ctxp;
101 static struct gimplify_omp_ctx *gimplify_omp_ctxp;
105 /* Formal (expression) temporary table handling: Multiple occurrences of
106 the same scalar expression are evaluated into the same temporary. */
108 typedef struct gimple_temp_hash_elt
111 tree temp; /* Value */
114 /* Forward declarations. */
115 static enum gimplify_status gimplify_compound_expr (tree *, tree *, bool);
116 #ifdef ENABLE_CHECKING
117 static bool cpt_same_type (tree a, tree b);
120 /* Mark X addressable. Unlike the langhook we expect X to be in gimple
121 form and we don't do any syntax checking. */
123 mark_addressable (tree x)
125 while (handled_component_p (x))
126 x = TREE_OPERAND (x, 0);
127 if (TREE_CODE (x) != VAR_DECL && TREE_CODE (x) != PARM_DECL)
129 TREE_ADDRESSABLE (x) = 1;
132 /* Return a hash value for a formal temporary table entry. */
135 gimple_tree_hash (const void *p)
137 tree t = ((const elt_t *) p)->val;
138 return iterative_hash_expr (t, 0);
141 /* Compare two formal temporary table entries. */
144 gimple_tree_eq (const void *p1, const void *p2)
146 tree t1 = ((const elt_t *) p1)->val;
147 tree t2 = ((const elt_t *) p2)->val;
148 enum tree_code code = TREE_CODE (t1);
150 if (TREE_CODE (t2) != code
151 || TREE_TYPE (t1) != TREE_TYPE (t2))
154 if (!operand_equal_p (t1, t2, 0))
157 /* Only allow them to compare equal if they also hash equal; otherwise
158 results are nondeterminate, and we fail bootstrap comparison. */
159 gcc_assert (gimple_tree_hash (p1) == gimple_tree_hash (p2));
164 /* Set up a context for the gimplifier. */
167 push_gimplify_context (void)
169 struct gimplify_ctx *c;
171 c = (struct gimplify_ctx *) xcalloc (1, sizeof (struct gimplify_ctx));
172 c->prev_context = gimplify_ctxp;
174 c->temp_htab = htab_create (1000, gimple_tree_hash, gimple_tree_eq, free);
179 /* Tear down a context for the gimplifier. If BODY is non-null, then
180 put the temporaries into the outer BIND_EXPR. Otherwise, put them
181 in the unexpanded_var_list. */
184 pop_gimplify_context (tree body)
186 struct gimplify_ctx *c = gimplify_ctxp;
189 gcc_assert (c && !c->current_bind_expr);
190 gimplify_ctxp = c->prev_context;
192 for (t = c->temps; t ; t = TREE_CHAIN (t))
193 DECL_GIMPLE_FORMAL_TEMP_P (t) = 0;
196 declare_vars (c->temps, body, false);
198 record_vars (c->temps);
201 htab_delete (c->temp_htab);
206 gimple_push_bind_expr (tree bind)
208 TREE_CHAIN (bind) = gimplify_ctxp->current_bind_expr;
209 gimplify_ctxp->current_bind_expr = bind;
213 gimple_pop_bind_expr (void)
215 gimplify_ctxp->current_bind_expr
216 = TREE_CHAIN (gimplify_ctxp->current_bind_expr);
220 gimple_current_bind_expr (void)
222 return gimplify_ctxp->current_bind_expr;
225 /* Returns true iff there is a COND_EXPR between us and the innermost
226 CLEANUP_POINT_EXPR. This info is used by gimple_push_cleanup. */
229 gimple_conditional_context (void)
231 return gimplify_ctxp->conditions > 0;
234 /* Note that we've entered a COND_EXPR. */
237 gimple_push_condition (void)
239 #ifdef ENABLE_CHECKING
240 if (gimplify_ctxp->conditions == 0)
241 gcc_assert (!gimplify_ctxp->conditional_cleanups);
243 ++(gimplify_ctxp->conditions);
246 /* Note that we've left a COND_EXPR. If we're back at unconditional scope
247 now, add any conditional cleanups we've seen to the prequeue. */
250 gimple_pop_condition (tree *pre_p)
252 int conds = --(gimplify_ctxp->conditions);
254 gcc_assert (conds >= 0);
257 append_to_statement_list (gimplify_ctxp->conditional_cleanups, pre_p);
258 gimplify_ctxp->conditional_cleanups = NULL_TREE;
262 /* A stable comparison routine for use with splay trees and DECLs. */
265 splay_tree_compare_decl_uid (splay_tree_key xa, splay_tree_key xb)
270 return DECL_UID (a) - DECL_UID (b);
273 /* Create a new omp construct that deals with variable remapping. */
275 static struct gimplify_omp_ctx *
276 new_omp_context (bool is_parallel, bool is_combined_parallel)
278 struct gimplify_omp_ctx *c;
280 c = XCNEW (struct gimplify_omp_ctx);
281 c->outer_context = gimplify_omp_ctxp;
282 c->variables = splay_tree_new (splay_tree_compare_decl_uid, 0, 0);
283 c->privatized_types = pointer_set_create ();
284 c->location = input_location;
285 c->is_parallel = is_parallel;
286 c->is_combined_parallel = is_combined_parallel;
287 c->default_kind = OMP_CLAUSE_DEFAULT_SHARED;
292 /* Destroy an omp construct that deals with variable remapping. */
295 delete_omp_context (struct gimplify_omp_ctx *c)
297 splay_tree_delete (c->variables);
298 pointer_set_destroy (c->privatized_types);
302 static void omp_add_variable (struct gimplify_omp_ctx *, tree, unsigned int);
303 static bool omp_notice_variable (struct gimplify_omp_ctx *, tree, bool);
305 /* A subroutine of append_to_statement_list{,_force}. T is not NULL. */
308 append_to_statement_list_1 (tree t, tree *list_p)
311 tree_stmt_iterator i;
315 if (t && TREE_CODE (t) == STATEMENT_LIST)
320 *list_p = list = alloc_stmt_list ();
324 tsi_link_after (&i, t, TSI_CONTINUE_LINKING);
327 /* Add T to the end of the list container pointed to by LIST_P.
328 If T is an expression with no effects, it is ignored. */
331 append_to_statement_list (tree t, tree *list_p)
333 if (t && TREE_SIDE_EFFECTS (t))
334 append_to_statement_list_1 (t, list_p);
337 /* Similar, but the statement is always added, regardless of side effects. */
340 append_to_statement_list_force (tree t, tree *list_p)
343 append_to_statement_list_1 (t, list_p);
346 /* Both gimplify the statement T and append it to LIST_P. */
349 gimplify_and_add (tree t, tree *list_p)
352 append_to_statement_list (t, list_p);
355 /* Strip off a legitimate source ending from the input string NAME of
356 length LEN. Rather than having to know the names used by all of
357 our front ends, we strip off an ending of a period followed by
358 up to five characters. (Java uses ".class".) */
361 remove_suffix (char *name, int len)
365 for (i = 2; i < 8 && len > i; i++)
367 if (name[len - i] == '.')
369 name[len - i] = '\0';
375 /* Create a nameless artificial label and put it in the current function
376 context. Returns the newly created label. */
379 create_artificial_label (void)
381 tree lab = build_decl (LABEL_DECL, NULL_TREE, void_type_node);
383 DECL_ARTIFICIAL (lab) = 1;
384 DECL_IGNORED_P (lab) = 1;
385 DECL_CONTEXT (lab) = current_function_decl;
389 /* Subroutine for find_single_pointer_decl. */
392 find_single_pointer_decl_1 (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
395 tree *pdecl = (tree *) data;
397 if (DECL_P (*tp) && POINTER_TYPE_P (TREE_TYPE (*tp)))
401 /* We already found a pointer decl; return anything other
402 than NULL_TREE to unwind from walk_tree signalling that
403 we have a duplicate. */
412 /* Find the single DECL of pointer type in the tree T and return it.
413 If there are zero or more than one such DECLs, return NULL. */
416 find_single_pointer_decl (tree t)
418 tree decl = NULL_TREE;
420 if (walk_tree (&t, find_single_pointer_decl_1, &decl, NULL))
422 /* find_single_pointer_decl_1 returns a nonzero value, causing
423 walk_tree to return a nonzero value, to indicate that it
424 found more than one pointer DECL. */
431 /* Create a new temporary name with PREFIX. Returns an identifier. */
433 static GTY(()) unsigned int tmp_var_id_num;
436 create_tmp_var_name (const char *prefix)
442 char *preftmp = ASTRDUP (prefix);
444 remove_suffix (preftmp, strlen (preftmp));
448 ASM_FORMAT_PRIVATE_NAME (tmp_name, prefix ? prefix : "T", tmp_var_id_num++);
449 return get_identifier (tmp_name);
453 /* Create a new temporary variable declaration of type TYPE.
454 Does NOT push it into the current binding. */
457 create_tmp_var_raw (tree type, const char *prefix)
462 /* Make the type of the variable writable. */
463 new_type = build_type_variant (type, 0, 0);
464 TYPE_ATTRIBUTES (new_type) = TYPE_ATTRIBUTES (type);
466 tmp_var = build_decl (VAR_DECL, prefix ? create_tmp_var_name (prefix) : NULL,
469 /* The variable was declared by the compiler. */
470 DECL_ARTIFICIAL (tmp_var) = 1;
471 /* And we don't want debug info for it. */
472 DECL_IGNORED_P (tmp_var) = 1;
474 /* Make the variable writable. */
475 TREE_READONLY (tmp_var) = 0;
477 DECL_EXTERNAL (tmp_var) = 0;
478 TREE_STATIC (tmp_var) = 0;
479 TREE_USED (tmp_var) = 1;
484 /* Create a new temporary variable declaration of type TYPE. DOES push the
485 variable into the current binding. Further, assume that this is called
486 only from gimplification or optimization, at which point the creation of
487 certain types are bugs. */
490 create_tmp_var (tree type, const char *prefix)
494 /* We don't allow types that are addressable (meaning we can't make copies),
495 or incomplete. We also used to reject every variable size objects here,
496 but now support those for which a constant upper bound can be obtained.
497 The processing for variable sizes is performed in gimple_add_tmp_var,
498 point at which it really matters and possibly reached via paths not going
499 through this function, e.g. after direct calls to create_tmp_var_raw. */
500 gcc_assert (!TREE_ADDRESSABLE (type) && COMPLETE_TYPE_P (type));
502 tmp_var = create_tmp_var_raw (type, prefix);
503 gimple_add_tmp_var (tmp_var);
507 /* Given a tree, try to return a useful variable name that we can use
508 to prefix a temporary that is being assigned the value of the tree.
509 I.E. given <temp> = &A, return A. */
517 STRIP_NOPS (stripped_decl);
518 if (DECL_P (stripped_decl) && DECL_NAME (stripped_decl))
519 return IDENTIFIER_POINTER (DECL_NAME (stripped_decl));
522 switch (TREE_CODE (stripped_decl))
525 return get_name (TREE_OPERAND (stripped_decl, 0));
532 /* Create a temporary with a name derived from VAL. Subroutine of
533 lookup_tmp_var; nobody else should call this function. */
536 create_tmp_from_val (tree val)
538 return create_tmp_var (TYPE_MAIN_VARIANT (TREE_TYPE (val)), get_name (val));
541 /* Create a temporary to hold the value of VAL. If IS_FORMAL, try to reuse
542 an existing expression temporary. */
545 lookup_tmp_var (tree val, bool is_formal)
549 /* If not optimizing, never really reuse a temporary. local-alloc
550 won't allocate any variable that is used in more than one basic
551 block, which means it will go into memory, causing much extra
552 work in reload and final and poorer code generation, outweighing
553 the extra memory allocation here. */
554 if (!optimize || !is_formal || TREE_SIDE_EFFECTS (val))
555 ret = create_tmp_from_val (val);
562 slot = htab_find_slot (gimplify_ctxp->temp_htab, (void *)&elt, INSERT);
565 elt_p = XNEW (elt_t);
567 elt_p->temp = ret = create_tmp_from_val (val);
568 *slot = (void *) elt_p;
572 elt_p = (elt_t *) *slot;
578 DECL_GIMPLE_FORMAL_TEMP_P (ret) = 1;
583 /* Returns a formal temporary variable initialized with VAL. PRE_P is as
584 in gimplify_expr. Only use this function if:
586 1) The value of the unfactored expression represented by VAL will not
587 change between the initialization and use of the temporary, and
588 2) The temporary will not be otherwise modified.
590 For instance, #1 means that this is inappropriate for SAVE_EXPR temps,
591 and #2 means it is inappropriate for && temps.
593 For other cases, use get_initialized_tmp_var instead. */
596 internal_get_tmp_var (tree val, tree *pre_p, tree *post_p, bool is_formal)
600 gimplify_expr (&val, pre_p, post_p, is_gimple_formal_tmp_rhs, fb_rvalue);
602 t = lookup_tmp_var (val, is_formal);
606 tree u = find_single_pointer_decl (val);
608 if (u && TREE_CODE (u) == VAR_DECL && DECL_BASED_ON_RESTRICT_P (u))
609 u = DECL_GET_RESTRICT_BASE (u);
610 if (u && TYPE_RESTRICT (TREE_TYPE (u)))
612 if (DECL_BASED_ON_RESTRICT_P (t))
613 gcc_assert (u == DECL_GET_RESTRICT_BASE (t));
616 DECL_BASED_ON_RESTRICT_P (t) = 1;
617 SET_DECL_RESTRICT_BASE (t, u);
622 if (TREE_CODE (TREE_TYPE (t)) == COMPLEX_TYPE
623 || TREE_CODE (TREE_TYPE (t)) == VECTOR_TYPE)
624 DECL_GIMPLE_REG_P (t) = 1;
626 mod = build2 (INIT_EXPR, TREE_TYPE (t), t, unshare_expr (val));
628 if (EXPR_HAS_LOCATION (val))
629 SET_EXPR_LOCUS (mod, EXPR_LOCUS (val));
631 SET_EXPR_LOCATION (mod, input_location);
633 /* gimplify_modify_expr might want to reduce this further. */
634 gimplify_and_add (mod, pre_p);
636 /* If we're gimplifying into ssa, gimplify_modify_expr will have
637 given our temporary an ssa name. Find and return it. */
638 if (gimplify_ctxp->into_ssa)
639 t = TREE_OPERAND (mod, 0);
644 /* Returns a formal temporary variable initialized with VAL. PRE_P
645 points to a statement list where side-effects needed to compute VAL
649 get_formal_tmp_var (tree val, tree *pre_p)
651 return internal_get_tmp_var (val, pre_p, NULL, true);
654 /* Returns a temporary variable initialized with VAL. PRE_P and POST_P
655 are as in gimplify_expr. */
658 get_initialized_tmp_var (tree val, tree *pre_p, tree *post_p)
660 return internal_get_tmp_var (val, pre_p, post_p, false);
663 /* Declares all the variables in VARS in SCOPE. If DEBUG_INFO is
664 true, generate debug info for them; otherwise don't. */
667 declare_vars (tree vars, tree scope, bool debug_info)
674 /* C99 mode puts the default 'return 0;' for main outside the outer
675 braces. So drill down until we find an actual scope. */
676 while (TREE_CODE (scope) == COMPOUND_EXPR)
677 scope = TREE_OPERAND (scope, 0);
679 gcc_assert (TREE_CODE (scope) == BIND_EXPR);
681 temps = nreverse (last);
683 block = BIND_EXPR_BLOCK (scope);
684 if (!block || !debug_info)
686 TREE_CHAIN (last) = BIND_EXPR_VARS (scope);
687 BIND_EXPR_VARS (scope) = temps;
691 /* We need to attach the nodes both to the BIND_EXPR and to its
692 associated BLOCK for debugging purposes. The key point here
693 is that the BLOCK_VARS of the BIND_EXPR_BLOCK of a BIND_EXPR
694 is a subchain of the BIND_EXPR_VARS of the BIND_EXPR. */
695 if (BLOCK_VARS (block))
696 BLOCK_VARS (block) = chainon (BLOCK_VARS (block), temps);
699 BIND_EXPR_VARS (scope) = chainon (BIND_EXPR_VARS (scope), temps);
700 BLOCK_VARS (block) = temps;
706 /* For VAR a VAR_DECL of variable size, try to find a constant upper bound
707 for the size and adjust DECL_SIZE/DECL_SIZE_UNIT accordingly. Abort if
708 no such upper bound can be obtained. */
711 force_constant_size (tree var)
713 /* The only attempt we make is by querying the maximum size of objects
714 of the variable's type. */
716 HOST_WIDE_INT max_size;
718 gcc_assert (TREE_CODE (var) == VAR_DECL);
720 max_size = max_int_size_in_bytes (TREE_TYPE (var));
722 gcc_assert (max_size >= 0);
725 = build_int_cst (TREE_TYPE (DECL_SIZE_UNIT (var)), max_size);
727 = build_int_cst (TREE_TYPE (DECL_SIZE (var)), max_size * BITS_PER_UNIT);
731 gimple_add_tmp_var (tree tmp)
733 gcc_assert (!TREE_CHAIN (tmp) && !DECL_SEEN_IN_BIND_EXPR_P (tmp));
735 /* Later processing assumes that the object size is constant, which might
736 not be true at this point. Force the use of a constant upper bound in
738 if (!host_integerp (DECL_SIZE_UNIT (tmp), 1))
739 force_constant_size (tmp);
741 DECL_CONTEXT (tmp) = current_function_decl;
742 DECL_SEEN_IN_BIND_EXPR_P (tmp) = 1;
746 TREE_CHAIN (tmp) = gimplify_ctxp->temps;
747 gimplify_ctxp->temps = tmp;
749 /* Mark temporaries local within the nearest enclosing parallel. */
750 if (gimplify_omp_ctxp)
752 struct gimplify_omp_ctx *ctx = gimplify_omp_ctxp;
753 while (ctx && !ctx->is_parallel)
754 ctx = ctx->outer_context;
756 omp_add_variable (ctx, tmp, GOVD_LOCAL | GOVD_SEEN);
762 declare_vars (tmp, DECL_SAVED_TREE (current_function_decl), false);
765 /* Determines whether to assign a locus to the statement STMT. */
768 should_carry_locus_p (tree stmt)
770 /* Don't emit a line note for a label. We particularly don't want to
771 emit one for the break label, since it doesn't actually correspond
772 to the beginning of the loop/switch. */
773 if (TREE_CODE (stmt) == LABEL_EXPR)
776 /* Do not annotate empty statements, since it confuses gcov. */
777 if (!TREE_SIDE_EFFECTS (stmt))
784 annotate_one_with_locus (tree t, location_t locus)
786 if (CAN_HAVE_LOCATION_P (t)
787 && ! EXPR_HAS_LOCATION (t) && should_carry_locus_p (t))
788 SET_EXPR_LOCATION (t, locus);
792 annotate_all_with_locus (tree *stmt_p, location_t locus)
794 tree_stmt_iterator i;
799 for (i = tsi_start (*stmt_p); !tsi_end_p (i); tsi_next (&i))
801 tree t = tsi_stmt (i);
803 /* Assuming we've already been gimplified, we shouldn't
804 see nested chaining constructs anymore. */
805 gcc_assert (TREE_CODE (t) != STATEMENT_LIST
806 && TREE_CODE (t) != COMPOUND_EXPR);
808 annotate_one_with_locus (t, locus);
812 /* Similar to copy_tree_r() but do not copy SAVE_EXPR or TARGET_EXPR nodes.
813 These nodes model computations that should only be done once. If we
814 were to unshare something like SAVE_EXPR(i++), the gimplification
815 process would create wrong code. */
818 mostly_copy_tree_r (tree *tp, int *walk_subtrees, void *data)
820 enum tree_code code = TREE_CODE (*tp);
821 /* Don't unshare types, decls, constants and SAVE_EXPR nodes. */
822 if (TREE_CODE_CLASS (code) == tcc_type
823 || TREE_CODE_CLASS (code) == tcc_declaration
824 || TREE_CODE_CLASS (code) == tcc_constant
825 || code == SAVE_EXPR || code == TARGET_EXPR
826 /* We can't do anything sensible with a BLOCK used as an expression,
827 but we also can't just die when we see it because of non-expression
828 uses. So just avert our eyes and cross our fingers. Silly Java. */
833 gcc_assert (code != BIND_EXPR);
834 copy_tree_r (tp, walk_subtrees, data);
840 /* Callback for walk_tree to unshare most of the shared trees rooted at
841 *TP. If *TP has been visited already (i.e., TREE_VISITED (*TP) == 1),
842 then *TP is deep copied by calling copy_tree_r.
844 This unshares the same trees as copy_tree_r with the exception of
845 SAVE_EXPR nodes. These nodes model computations that should only be
846 done once. If we were to unshare something like SAVE_EXPR(i++), the
847 gimplification process would create wrong code. */
850 copy_if_shared_r (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
851 void *data ATTRIBUTE_UNUSED)
854 enum tree_code code = TREE_CODE (t);
856 /* Skip types, decls, and constants. But we do want to look at their
857 types and the bounds of types. Mark them as visited so we properly
858 unmark their subtrees on the unmark pass. If we've already seen them,
859 don't look down further. */
860 if (TREE_CODE_CLASS (code) == tcc_type
861 || TREE_CODE_CLASS (code) == tcc_declaration
862 || TREE_CODE_CLASS (code) == tcc_constant)
864 if (TREE_VISITED (t))
867 TREE_VISITED (t) = 1;
870 /* If this node has been visited already, unshare it and don't look
872 else if (TREE_VISITED (t))
874 walk_tree (tp, mostly_copy_tree_r, NULL, NULL);
878 /* Otherwise, mark the tree as visited and keep looking. */
880 TREE_VISITED (t) = 1;
886 unmark_visited_r (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
887 void *data ATTRIBUTE_UNUSED)
889 if (TREE_VISITED (*tp))
890 TREE_VISITED (*tp) = 0;
897 /* Unshare all the trees in BODY_P, a pointer into the body of FNDECL, and the
898 bodies of any nested functions if we are unsharing the entire body of
902 unshare_body (tree *body_p, tree fndecl)
904 struct cgraph_node *cgn = cgraph_node (fndecl);
906 walk_tree (body_p, copy_if_shared_r, NULL, NULL);
907 if (body_p == &DECL_SAVED_TREE (fndecl))
908 for (cgn = cgn->nested; cgn; cgn = cgn->next_nested)
909 unshare_body (&DECL_SAVED_TREE (cgn->decl), cgn->decl);
912 /* Likewise, but mark all trees as not visited. */
915 unvisit_body (tree *body_p, tree fndecl)
917 struct cgraph_node *cgn = cgraph_node (fndecl);
919 walk_tree (body_p, unmark_visited_r, NULL, NULL);
920 if (body_p == &DECL_SAVED_TREE (fndecl))
921 for (cgn = cgn->nested; cgn; cgn = cgn->next_nested)
922 unvisit_body (&DECL_SAVED_TREE (cgn->decl), cgn->decl);
925 /* Unshare T and all the trees reached from T via TREE_CHAIN. */
928 unshare_all_trees (tree t)
930 walk_tree (&t, copy_if_shared_r, NULL, NULL);
931 walk_tree (&t, unmark_visited_r, NULL, NULL);
934 /* Unconditionally make an unshared copy of EXPR. This is used when using
935 stored expressions which span multiple functions, such as BINFO_VTABLE,
936 as the normal unsharing process can't tell that they're shared. */
939 unshare_expr (tree expr)
941 walk_tree (&expr, mostly_copy_tree_r, NULL, NULL);
945 /* A terser interface for building a representation of an exception
949 gimple_build_eh_filter (tree body, tree allowed, tree failure)
953 /* FIXME should the allowed types go in TREE_TYPE? */
954 t = build2 (EH_FILTER_EXPR, void_type_node, allowed, NULL_TREE);
955 append_to_statement_list (failure, &EH_FILTER_FAILURE (t));
957 t = build2 (TRY_CATCH_EXPR, void_type_node, NULL_TREE, t);
958 append_to_statement_list (body, &TREE_OPERAND (t, 0));
964 /* WRAPPER is a code such as BIND_EXPR or CLEANUP_POINT_EXPR which can both
965 contain statements and have a value. Assign its value to a temporary
966 and give it void_type_node. Returns the temporary, or NULL_TREE if
967 WRAPPER was already void. */
970 voidify_wrapper_expr (tree wrapper, tree temp)
972 tree type = TREE_TYPE (wrapper);
973 if (type && !VOID_TYPE_P (type))
977 /* Set p to point to the body of the wrapper. Loop until we find
978 something that isn't a wrapper. */
979 for (p = &wrapper; p && *p; )
981 switch (TREE_CODE (*p))
984 TREE_SIDE_EFFECTS (*p) = 1;
985 TREE_TYPE (*p) = void_type_node;
986 /* For a BIND_EXPR, the body is operand 1. */
987 p = &BIND_EXPR_BODY (*p);
990 case CLEANUP_POINT_EXPR:
991 case TRY_FINALLY_EXPR:
993 TREE_SIDE_EFFECTS (*p) = 1;
994 TREE_TYPE (*p) = void_type_node;
995 p = &TREE_OPERAND (*p, 0);
1000 tree_stmt_iterator i = tsi_last (*p);
1001 TREE_SIDE_EFFECTS (*p) = 1;
1002 TREE_TYPE (*p) = void_type_node;
1003 p = tsi_end_p (i) ? NULL : tsi_stmt_ptr (i);
1008 /* Advance to the last statement. Set all container types to void. */
1009 for (; TREE_CODE (*p) == COMPOUND_EXPR; p = &TREE_OPERAND (*p, 1))
1011 TREE_SIDE_EFFECTS (*p) = 1;
1012 TREE_TYPE (*p) = void_type_node;
1022 if (p == NULL || IS_EMPTY_STMT (*p))
1026 /* The wrapper is on the RHS of an assignment that we're pushing
1028 gcc_assert (TREE_CODE (temp) == INIT_EXPR
1029 || TREE_CODE (temp) == GIMPLE_MODIFY_STMT
1030 || TREE_CODE (temp) == MODIFY_EXPR);
1031 GENERIC_TREE_OPERAND (temp, 1) = *p;
1036 temp = create_tmp_var (type, "retval");
1037 *p = build2 (INIT_EXPR, type, temp, *p);
1046 /* Prepare calls to builtins to SAVE and RESTORE the stack as well as
1047 a temporary through which they communicate. */
1050 build_stack_save_restore (tree *save, tree *restore)
1052 tree save_call, tmp_var;
1055 build_call_expr (implicit_built_in_decls[BUILT_IN_STACK_SAVE], 0);
1056 tmp_var = create_tmp_var (ptr_type_node, "saved_stack");
1058 *save = build_gimple_modify_stmt (tmp_var, save_call);
1060 build_call_expr (implicit_built_in_decls[BUILT_IN_STACK_RESTORE],
1064 /* Gimplify a BIND_EXPR. Just voidify and recurse. */
1066 static enum gimplify_status
1067 gimplify_bind_expr (tree *expr_p, tree *pre_p)
1069 tree bind_expr = *expr_p;
1070 bool old_save_stack = gimplify_ctxp->save_stack;
1073 tree temp = voidify_wrapper_expr (bind_expr, NULL);
1075 /* Mark variables seen in this bind expr. */
1076 for (t = BIND_EXPR_VARS (bind_expr); t ; t = TREE_CHAIN (t))
1078 if (TREE_CODE (t) == VAR_DECL)
1080 struct gimplify_omp_ctx *ctx = gimplify_omp_ctxp;
1082 /* Mark variable as local. */
1083 if (ctx && !is_global_var (t)
1084 && (! DECL_SEEN_IN_BIND_EXPR_P (t)
1085 || splay_tree_lookup (ctx->variables,
1086 (splay_tree_key) t) == NULL))
1087 omp_add_variable (gimplify_omp_ctxp, t, GOVD_LOCAL | GOVD_SEEN);
1089 DECL_SEEN_IN_BIND_EXPR_P (t) = 1;
1092 /* Preliminarily mark non-addressed complex variables as eligible
1093 for promotion to gimple registers. We'll transform their uses
1095 if ((TREE_CODE (TREE_TYPE (t)) == COMPLEX_TYPE
1096 || TREE_CODE (TREE_TYPE (t)) == VECTOR_TYPE)
1097 && !TREE_THIS_VOLATILE (t)
1098 && (TREE_CODE (t) == VAR_DECL && !DECL_HARD_REGISTER (t))
1099 && !needs_to_live_in_memory (t))
1100 DECL_GIMPLE_REG_P (t) = 1;
1103 gimple_push_bind_expr (bind_expr);
1104 gimplify_ctxp->save_stack = false;
1106 gimplify_to_stmt_list (&BIND_EXPR_BODY (bind_expr));
1108 if (gimplify_ctxp->save_stack)
1110 tree stack_save, stack_restore;
1112 /* Save stack on entry and restore it on exit. Add a try_finally
1113 block to achieve this. Note that mudflap depends on the
1114 format of the emitted code: see mx_register_decls(). */
1115 build_stack_save_restore (&stack_save, &stack_restore);
1117 t = build2 (TRY_FINALLY_EXPR, void_type_node,
1118 BIND_EXPR_BODY (bind_expr), NULL_TREE);
1119 append_to_statement_list (stack_restore, &TREE_OPERAND (t, 1));
1121 BIND_EXPR_BODY (bind_expr) = NULL_TREE;
1122 append_to_statement_list (stack_save, &BIND_EXPR_BODY (bind_expr));
1123 append_to_statement_list (t, &BIND_EXPR_BODY (bind_expr));
1126 gimplify_ctxp->save_stack = old_save_stack;
1127 gimple_pop_bind_expr ();
1132 append_to_statement_list (bind_expr, pre_p);
1139 /* Gimplify a RETURN_EXPR. If the expression to be returned is not a
1140 GIMPLE value, it is assigned to a new temporary and the statement is
1141 re-written to return the temporary.
1143 PRE_P points to the list where side effects that must happen before
1144 STMT should be stored. */
1146 static enum gimplify_status
1147 gimplify_return_expr (tree stmt, tree *pre_p)
1149 tree ret_expr = TREE_OPERAND (stmt, 0);
1150 tree result_decl, result;
1152 if (!ret_expr || TREE_CODE (ret_expr) == RESULT_DECL
1153 || ret_expr == error_mark_node)
1156 if (VOID_TYPE_P (TREE_TYPE (TREE_TYPE (current_function_decl))))
1157 result_decl = NULL_TREE;
1160 result_decl = GENERIC_TREE_OPERAND (ret_expr, 0);
1161 if (TREE_CODE (result_decl) == INDIRECT_REF)
1162 /* See through a return by reference. */
1163 result_decl = TREE_OPERAND (result_decl, 0);
1165 gcc_assert ((TREE_CODE (ret_expr) == MODIFY_EXPR
1166 || TREE_CODE (ret_expr) == GIMPLE_MODIFY_STMT
1167 || TREE_CODE (ret_expr) == INIT_EXPR)
1168 && TREE_CODE (result_decl) == RESULT_DECL);
1171 /* If aggregate_value_p is true, then we can return the bare RESULT_DECL.
1172 Recall that aggregate_value_p is FALSE for any aggregate type that is
1173 returned in registers. If we're returning values in registers, then
1174 we don't want to extend the lifetime of the RESULT_DECL, particularly
1175 across another call. In addition, for those aggregates for which
1176 hard_function_value generates a PARALLEL, we'll die during normal
1177 expansion of structure assignments; there's special code in expand_return
1178 to handle this case that does not exist in expand_expr. */
1180 || aggregate_value_p (result_decl, TREE_TYPE (current_function_decl)))
1181 result = result_decl;
1182 else if (gimplify_ctxp->return_temp)
1183 result = gimplify_ctxp->return_temp;
1186 result = create_tmp_var (TREE_TYPE (result_decl), NULL);
1187 if (TREE_CODE (TREE_TYPE (result)) == COMPLEX_TYPE
1188 || TREE_CODE (TREE_TYPE (result)) == VECTOR_TYPE)
1189 DECL_GIMPLE_REG_P (result) = 1;
1191 /* ??? With complex control flow (usually involving abnormal edges),
1192 we can wind up warning about an uninitialized value for this. Due
1193 to how this variable is constructed and initialized, this is never
1194 true. Give up and never warn. */
1195 TREE_NO_WARNING (result) = 1;
1197 gimplify_ctxp->return_temp = result;
1200 /* Smash the lhs of the GIMPLE_MODIFY_STMT to the temporary we plan to use.
1201 Then gimplify the whole thing. */
1202 if (result != result_decl)
1203 GENERIC_TREE_OPERAND (ret_expr, 0) = result;
1205 gimplify_and_add (TREE_OPERAND (stmt, 0), pre_p);
1207 /* If we didn't use a temporary, then the result is just the result_decl.
1208 Otherwise we need a simple copy. This should already be gimple. */
1209 if (result == result_decl)
1212 ret_expr = build_gimple_modify_stmt (result_decl, result);
1213 TREE_OPERAND (stmt, 0) = ret_expr;
1218 /* Gimplifies a DECL_EXPR node *STMT_P by making any necessary allocation
1219 and initialization explicit. */
1221 static enum gimplify_status
1222 gimplify_decl_expr (tree *stmt_p)
1224 tree stmt = *stmt_p;
1225 tree decl = DECL_EXPR_DECL (stmt);
1227 *stmt_p = NULL_TREE;
1229 if (TREE_TYPE (decl) == error_mark_node)
1232 if ((TREE_CODE (decl) == TYPE_DECL
1233 || TREE_CODE (decl) == VAR_DECL)
1234 && !TYPE_SIZES_GIMPLIFIED (TREE_TYPE (decl)))
1235 gimplify_type_sizes (TREE_TYPE (decl), stmt_p);
1237 if (TREE_CODE (decl) == VAR_DECL && !DECL_EXTERNAL (decl))
1239 tree init = DECL_INITIAL (decl);
1241 if (TREE_CODE (DECL_SIZE (decl)) != INTEGER_CST)
1243 /* This is a variable-sized decl. Simplify its size and mark it
1244 for deferred expansion. Note that mudflap depends on the format
1245 of the emitted code: see mx_register_decls(). */
1246 tree t, addr, ptr_type;
1248 gimplify_one_sizepos (&DECL_SIZE (decl), stmt_p);
1249 gimplify_one_sizepos (&DECL_SIZE_UNIT (decl), stmt_p);
1251 /* All occurrences of this decl in final gimplified code will be
1252 replaced by indirection. Setting DECL_VALUE_EXPR does two
1253 things: First, it lets the rest of the gimplifier know what
1254 replacement to use. Second, it lets the debug info know
1255 where to find the value. */
1256 ptr_type = build_pointer_type (TREE_TYPE (decl));
1257 addr = create_tmp_var (ptr_type, get_name (decl));
1258 DECL_IGNORED_P (addr) = 0;
1259 t = build_fold_indirect_ref (addr);
1260 SET_DECL_VALUE_EXPR (decl, t);
1261 DECL_HAS_VALUE_EXPR_P (decl) = 1;
1263 t = built_in_decls[BUILT_IN_ALLOCA];
1264 t = build_call_expr (t, 1, DECL_SIZE_UNIT (decl));
1265 t = fold_convert (ptr_type, t);
1266 t = build_gimple_modify_stmt (addr, t);
1268 gimplify_and_add (t, stmt_p);
1270 /* Indicate that we need to restore the stack level when the
1271 enclosing BIND_EXPR is exited. */
1272 gimplify_ctxp->save_stack = true;
1275 if (init && init != error_mark_node)
1277 if (!TREE_STATIC (decl))
1279 DECL_INITIAL (decl) = NULL_TREE;
1280 init = build2 (INIT_EXPR, void_type_node, decl, init);
1281 gimplify_and_add (init, stmt_p);
1284 /* We must still examine initializers for static variables
1285 as they may contain a label address. */
1286 walk_tree (&init, force_labels_r, NULL, NULL);
1289 /* Some front ends do not explicitly declare all anonymous
1290 artificial variables. We compensate here by declaring the
1291 variables, though it would be better if the front ends would
1292 explicitly declare them. */
1293 if (!DECL_SEEN_IN_BIND_EXPR_P (decl)
1294 && DECL_ARTIFICIAL (decl) && DECL_NAME (decl) == NULL_TREE)
1295 gimple_add_tmp_var (decl);
1301 /* Gimplify a LOOP_EXPR. Normally this just involves gimplifying the body
1302 and replacing the LOOP_EXPR with goto, but if the loop contains an
1303 EXIT_EXPR, we need to append a label for it to jump to. */
1305 static enum gimplify_status
1306 gimplify_loop_expr (tree *expr_p, tree *pre_p)
1308 tree saved_label = gimplify_ctxp->exit_label;
1309 tree start_label = build1 (LABEL_EXPR, void_type_node, NULL_TREE);
1310 tree jump_stmt = build_and_jump (&LABEL_EXPR_LABEL (start_label));
1312 append_to_statement_list (start_label, pre_p);
1314 gimplify_ctxp->exit_label = NULL_TREE;
1316 gimplify_and_add (LOOP_EXPR_BODY (*expr_p), pre_p);
1318 if (gimplify_ctxp->exit_label)
1320 append_to_statement_list (jump_stmt, pre_p);
1321 *expr_p = build1 (LABEL_EXPR, void_type_node, gimplify_ctxp->exit_label);
1324 *expr_p = jump_stmt;
1326 gimplify_ctxp->exit_label = saved_label;
1331 /* Compare two case labels. Because the front end should already have
1332 made sure that case ranges do not overlap, it is enough to only compare
1333 the CASE_LOW values of each case label. */
1336 compare_case_labels (const void *p1, const void *p2)
1338 tree case1 = *(tree *)p1;
1339 tree case2 = *(tree *)p2;
1341 return tree_int_cst_compare (CASE_LOW (case1), CASE_LOW (case2));
1344 /* Sort the case labels in LABEL_VEC in place in ascending order. */
1347 sort_case_labels (tree label_vec)
1349 size_t len = TREE_VEC_LENGTH (label_vec);
1350 tree default_case = TREE_VEC_ELT (label_vec, len - 1);
1352 if (CASE_LOW (default_case))
1356 /* The last label in the vector should be the default case
1358 for (i = 0; i < len; ++i)
1360 tree t = TREE_VEC_ELT (label_vec, i);
1364 TREE_VEC_ELT (label_vec, i) = TREE_VEC_ELT (label_vec, len - 1);
1365 TREE_VEC_ELT (label_vec, len - 1) = default_case;
1371 qsort (&TREE_VEC_ELT (label_vec, 0), len - 1, sizeof (tree),
1372 compare_case_labels);
1375 /* Gimplify a SWITCH_EXPR, and collect a TREE_VEC of the labels it can
1378 static enum gimplify_status
1379 gimplify_switch_expr (tree *expr_p, tree *pre_p)
1381 tree switch_expr = *expr_p;
1382 enum gimplify_status ret;
1384 ret = gimplify_expr (&SWITCH_COND (switch_expr), pre_p, NULL,
1385 is_gimple_val, fb_rvalue);
1387 if (SWITCH_BODY (switch_expr))
1389 VEC(tree,heap) *labels, *saved_labels;
1390 tree label_vec, default_case = NULL_TREE;
1393 /* If someone can be bothered to fill in the labels, they can
1394 be bothered to null out the body too. */
1395 gcc_assert (!SWITCH_LABELS (switch_expr));
1397 saved_labels = gimplify_ctxp->case_labels;
1398 gimplify_ctxp->case_labels = VEC_alloc (tree, heap, 8);
1400 gimplify_to_stmt_list (&SWITCH_BODY (switch_expr));
1402 labels = gimplify_ctxp->case_labels;
1403 gimplify_ctxp->case_labels = saved_labels;
1406 while (i < VEC_length (tree, labels))
1408 tree elt = VEC_index (tree, labels, i);
1409 tree low = CASE_LOW (elt);
1410 bool remove_element = FALSE;
1414 /* Discard empty ranges. */
1415 tree high = CASE_HIGH (elt);
1416 if (high && INT_CST_LT (high, low))
1417 remove_element = TRUE;
1421 /* The default case must be the last label in the list. */
1422 gcc_assert (!default_case);
1424 remove_element = TRUE;
1428 VEC_ordered_remove (tree, labels, i);
1434 label_vec = make_tree_vec (len + 1);
1435 SWITCH_LABELS (*expr_p) = label_vec;
1436 append_to_statement_list (switch_expr, pre_p);
1440 /* If the switch has no default label, add one, so that we jump
1441 around the switch body. */
1442 default_case = build3 (CASE_LABEL_EXPR, void_type_node, NULL_TREE,
1443 NULL_TREE, create_artificial_label ());
1444 append_to_statement_list (SWITCH_BODY (switch_expr), pre_p);
1445 *expr_p = build1 (LABEL_EXPR, void_type_node,
1446 CASE_LABEL (default_case));
1449 *expr_p = SWITCH_BODY (switch_expr);
1451 for (i = 0; i < len; ++i)
1452 TREE_VEC_ELT (label_vec, i) = VEC_index (tree, labels, i);
1453 TREE_VEC_ELT (label_vec, len) = default_case;
1455 VEC_free (tree, heap, labels);
1457 sort_case_labels (label_vec);
1459 SWITCH_BODY (switch_expr) = NULL;
1462 gcc_assert (SWITCH_LABELS (switch_expr));
1467 static enum gimplify_status
1468 gimplify_case_label_expr (tree *expr_p)
1470 tree expr = *expr_p;
1471 struct gimplify_ctx *ctxp;
1473 /* Invalid OpenMP programs can play Duff's Device type games with
1474 #pragma omp parallel. At least in the C front end, we don't
1475 detect such invalid branches until after gimplification. */
1476 for (ctxp = gimplify_ctxp; ; ctxp = ctxp->prev_context)
1477 if (ctxp->case_labels)
1480 VEC_safe_push (tree, heap, ctxp->case_labels, expr);
1481 *expr_p = build1 (LABEL_EXPR, void_type_node, CASE_LABEL (expr));
1485 /* Build a GOTO to the LABEL_DECL pointed to by LABEL_P, building it first
1489 build_and_jump (tree *label_p)
1491 if (label_p == NULL)
1492 /* If there's nowhere to jump, just fall through. */
1495 if (*label_p == NULL_TREE)
1497 tree label = create_artificial_label ();
1501 return build1 (GOTO_EXPR, void_type_node, *label_p);
1504 /* Gimplify an EXIT_EXPR by converting to a GOTO_EXPR inside a COND_EXPR.
1505 This also involves building a label to jump to and communicating it to
1506 gimplify_loop_expr through gimplify_ctxp->exit_label. */
1508 static enum gimplify_status
1509 gimplify_exit_expr (tree *expr_p)
1511 tree cond = TREE_OPERAND (*expr_p, 0);
1514 expr = build_and_jump (&gimplify_ctxp->exit_label);
1515 expr = build3 (COND_EXPR, void_type_node, cond, expr, NULL_TREE);
1521 /* A helper function to be called via walk_tree. Mark all labels under *TP
1522 as being forced. To be called for DECL_INITIAL of static variables. */
1525 force_labels_r (tree *tp, int *walk_subtrees, void *data ATTRIBUTE_UNUSED)
1529 if (TREE_CODE (*tp) == LABEL_DECL)
1530 FORCED_LABEL (*tp) = 1;
1535 /* *EXPR_P is a COMPONENT_REF being used as an rvalue. If its type is
1536 different from its canonical type, wrap the whole thing inside a
1537 NOP_EXPR and force the type of the COMPONENT_REF to be the canonical
1540 The canonical type of a COMPONENT_REF is the type of the field being
1541 referenced--unless the field is a bit-field which can be read directly
1542 in a smaller mode, in which case the canonical type is the
1543 sign-appropriate type corresponding to that mode. */
1546 canonicalize_component_ref (tree *expr_p)
1548 tree expr = *expr_p;
1551 gcc_assert (TREE_CODE (expr) == COMPONENT_REF);
1553 if (INTEGRAL_TYPE_P (TREE_TYPE (expr)))
1554 type = TREE_TYPE (get_unwidened (expr, NULL_TREE));
1556 type = TREE_TYPE (TREE_OPERAND (expr, 1));
1558 if (TREE_TYPE (expr) != type)
1560 tree old_type = TREE_TYPE (expr);
1562 /* Set the type of the COMPONENT_REF to the underlying type. */
1563 TREE_TYPE (expr) = type;
1565 /* And wrap the whole thing inside a NOP_EXPR. */
1566 expr = build1 (NOP_EXPR, old_type, expr);
1572 /* If a NOP conversion is changing a pointer to array of foo to a pointer
1573 to foo, embed that change in the ADDR_EXPR by converting
1578 where L is the lower bound. For simplicity, only do this for constant
1582 canonicalize_addr_expr (tree *expr_p)
1584 tree expr = *expr_p;
1585 tree ctype = TREE_TYPE (expr);
1586 tree addr_expr = TREE_OPERAND (expr, 0);
1587 tree atype = TREE_TYPE (addr_expr);
1588 tree dctype, datype, ddatype, otype, obj_expr;
1590 /* Both cast and addr_expr types should be pointers. */
1591 if (!POINTER_TYPE_P (ctype) || !POINTER_TYPE_P (atype))
1594 /* The addr_expr type should be a pointer to an array. */
1595 datype = TREE_TYPE (atype);
1596 if (TREE_CODE (datype) != ARRAY_TYPE)
1599 /* Both cast and addr_expr types should address the same object type. */
1600 dctype = TREE_TYPE (ctype);
1601 ddatype = TREE_TYPE (datype);
1602 if (!useless_type_conversion_p (dctype, ddatype))
1605 /* The addr_expr and the object type should match. */
1606 obj_expr = TREE_OPERAND (addr_expr, 0);
1607 otype = TREE_TYPE (obj_expr);
1608 if (!useless_type_conversion_p (datype, otype))
1611 /* The lower bound and element sizes must be constant. */
1612 if (!TYPE_SIZE_UNIT (dctype)
1613 || TREE_CODE (TYPE_SIZE_UNIT (dctype)) != INTEGER_CST
1614 || !TYPE_DOMAIN (datype) || !TYPE_MIN_VALUE (TYPE_DOMAIN (datype))
1615 || TREE_CODE (TYPE_MIN_VALUE (TYPE_DOMAIN (datype))) != INTEGER_CST)
1618 /* All checks succeeded. Build a new node to merge the cast. */
1619 *expr_p = build4 (ARRAY_REF, dctype, obj_expr,
1620 TYPE_MIN_VALUE (TYPE_DOMAIN (datype)),
1621 NULL_TREE, NULL_TREE);
1622 *expr_p = build1 (ADDR_EXPR, ctype, *expr_p);
1625 /* *EXPR_P is a NOP_EXPR or CONVERT_EXPR. Remove it and/or other conversions
1626 underneath as appropriate. */
1628 static enum gimplify_status
1629 gimplify_conversion (tree *expr_p)
1632 gcc_assert (TREE_CODE (*expr_p) == NOP_EXPR
1633 || TREE_CODE (*expr_p) == CONVERT_EXPR);
1635 /* Then strip away all but the outermost conversion. */
1636 STRIP_SIGN_NOPS (TREE_OPERAND (*expr_p, 0));
1638 /* And remove the outermost conversion if it's useless. */
1639 if (tree_ssa_useless_type_conversion (*expr_p))
1640 *expr_p = TREE_OPERAND (*expr_p, 0);
1642 /* Attempt to avoid NOP_EXPR by producing reference to a subtype.
1643 For example this fold (subclass *)&A into &A->subclass avoiding
1644 a need for statement. */
1645 if (TREE_CODE (*expr_p) == NOP_EXPR
1646 && POINTER_TYPE_P (TREE_TYPE (*expr_p))
1647 && POINTER_TYPE_P (TREE_TYPE (TREE_OPERAND (*expr_p, 0)))
1648 && (tem = maybe_fold_offset_to_reference
1649 (TREE_OPERAND (*expr_p, 0),
1650 integer_zero_node, TREE_TYPE (TREE_TYPE (*expr_p)))))
1651 *expr_p = build_fold_addr_expr_with_type (tem, TREE_TYPE (*expr_p));
1653 /* If we still have a conversion at the toplevel,
1654 then canonicalize some constructs. */
1655 if (TREE_CODE (*expr_p) == NOP_EXPR || TREE_CODE (*expr_p) == CONVERT_EXPR)
1657 tree sub = TREE_OPERAND (*expr_p, 0);
1659 /* If a NOP conversion is changing the type of a COMPONENT_REF
1660 expression, then canonicalize its type now in order to expose more
1661 redundant conversions. */
1662 if (TREE_CODE (sub) == COMPONENT_REF)
1663 canonicalize_component_ref (&TREE_OPERAND (*expr_p, 0));
1665 /* If a NOP conversion is changing a pointer to array of foo
1666 to a pointer to foo, embed that change in the ADDR_EXPR. */
1667 else if (TREE_CODE (sub) == ADDR_EXPR)
1668 canonicalize_addr_expr (expr_p);
1674 /* Gimplify a VAR_DECL or PARM_DECL. Returns GS_OK if we expanded a
1675 DECL_VALUE_EXPR, and it's worth re-examining things. */
1677 static enum gimplify_status
1678 gimplify_var_or_parm_decl (tree *expr_p)
1680 tree decl = *expr_p;
1682 /* ??? If this is a local variable, and it has not been seen in any
1683 outer BIND_EXPR, then it's probably the result of a duplicate
1684 declaration, for which we've already issued an error. It would
1685 be really nice if the front end wouldn't leak these at all.
1686 Currently the only known culprit is C++ destructors, as seen
1687 in g++.old-deja/g++.jason/binding.C. */
1688 if (TREE_CODE (decl) == VAR_DECL
1689 && !DECL_SEEN_IN_BIND_EXPR_P (decl)
1690 && !TREE_STATIC (decl) && !DECL_EXTERNAL (decl)
1691 && decl_function_context (decl) == current_function_decl)
1693 gcc_assert (errorcount || sorrycount);
1697 /* When within an OpenMP context, notice uses of variables. */
1698 if (gimplify_omp_ctxp && omp_notice_variable (gimplify_omp_ctxp, decl, true))
1701 /* If the decl is an alias for another expression, substitute it now. */
1702 if (DECL_HAS_VALUE_EXPR_P (decl))
1704 *expr_p = unshare_expr (DECL_VALUE_EXPR (decl));
1712 /* Gimplify the COMPONENT_REF, ARRAY_REF, REALPART_EXPR or IMAGPART_EXPR
1713 node pointed to by EXPR_P.
1716 : min_lval '[' val ']'
1718 | compound_lval '[' val ']'
1719 | compound_lval '.' ID
1721 This is not part of the original SIMPLE definition, which separates
1722 array and member references, but it seems reasonable to handle them
1723 together. Also, this way we don't run into problems with union
1724 aliasing; gcc requires that for accesses through a union to alias, the
1725 union reference must be explicit, which was not always the case when we
1726 were splitting up array and member refs.
1728 PRE_P points to the list where side effects that must happen before
1729 *EXPR_P should be stored.
1731 POST_P points to the list where side effects that must happen after
1732 *EXPR_P should be stored. */
1734 static enum gimplify_status
1735 gimplify_compound_lval (tree *expr_p, tree *pre_p,
1736 tree *post_p, fallback_t fallback)
1739 VEC(tree,heap) *stack;
1740 enum gimplify_status ret = GS_OK, tret;
1743 /* Create a stack of the subexpressions so later we can walk them in
1744 order from inner to outer. */
1745 stack = VEC_alloc (tree, heap, 10);
1747 /* We can handle anything that get_inner_reference can deal with. */
1748 for (p = expr_p; ; p = &TREE_OPERAND (*p, 0))
1751 /* Fold INDIRECT_REFs now to turn them into ARRAY_REFs. */
1752 if (TREE_CODE (*p) == INDIRECT_REF)
1753 *p = fold_indirect_ref (*p);
1755 if (handled_component_p (*p))
1757 /* Expand DECL_VALUE_EXPR now. In some cases that may expose
1758 additional COMPONENT_REFs. */
1759 else if ((TREE_CODE (*p) == VAR_DECL || TREE_CODE (*p) == PARM_DECL)
1760 && gimplify_var_or_parm_decl (p) == GS_OK)
1765 VEC_safe_push (tree, heap, stack, *p);
1768 gcc_assert (VEC_length (tree, stack));
1770 /* Now STACK is a stack of pointers to all the refs we've walked through
1771 and P points to the innermost expression.
1773 Java requires that we elaborated nodes in source order. That
1774 means we must gimplify the inner expression followed by each of
1775 the indices, in order. But we can't gimplify the inner
1776 expression until we deal with any variable bounds, sizes, or
1777 positions in order to deal with PLACEHOLDER_EXPRs.
1779 So we do this in three steps. First we deal with the annotations
1780 for any variables in the components, then we gimplify the base,
1781 then we gimplify any indices, from left to right. */
1782 for (i = VEC_length (tree, stack) - 1; i >= 0; i--)
1784 tree t = VEC_index (tree, stack, i);
1786 if (TREE_CODE (t) == ARRAY_REF || TREE_CODE (t) == ARRAY_RANGE_REF)
1788 /* Gimplify the low bound and element type size and put them into
1789 the ARRAY_REF. If these values are set, they have already been
1791 if (!TREE_OPERAND (t, 2))
1793 tree low = unshare_expr (array_ref_low_bound (t));
1794 if (!is_gimple_min_invariant (low))
1796 TREE_OPERAND (t, 2) = low;
1797 tret = gimplify_expr (&TREE_OPERAND (t, 2), pre_p, post_p,
1798 is_gimple_formal_tmp_reg, fb_rvalue);
1799 ret = MIN (ret, tret);
1803 if (!TREE_OPERAND (t, 3))
1805 tree elmt_type = TREE_TYPE (TREE_TYPE (TREE_OPERAND (t, 0)));
1806 tree elmt_size = unshare_expr (array_ref_element_size (t));
1807 tree factor = size_int (TYPE_ALIGN_UNIT (elmt_type));
1809 /* Divide the element size by the alignment of the element
1811 elmt_size = size_binop (EXACT_DIV_EXPR, elmt_size, factor);
1813 if (!is_gimple_min_invariant (elmt_size))
1815 TREE_OPERAND (t, 3) = elmt_size;
1816 tret = gimplify_expr (&TREE_OPERAND (t, 3), pre_p, post_p,
1817 is_gimple_formal_tmp_reg, fb_rvalue);
1818 ret = MIN (ret, tret);
1822 else if (TREE_CODE (t) == COMPONENT_REF)
1824 /* Set the field offset into T and gimplify it. */
1825 if (!TREE_OPERAND (t, 2))
1827 tree offset = unshare_expr (component_ref_field_offset (t));
1828 tree field = TREE_OPERAND (t, 1);
1830 = size_int (DECL_OFFSET_ALIGN (field) / BITS_PER_UNIT);
1832 /* Divide the offset by its alignment. */
1833 offset = size_binop (EXACT_DIV_EXPR, offset, factor);
1835 if (!is_gimple_min_invariant (offset))
1837 TREE_OPERAND (t, 2) = offset;
1838 tret = gimplify_expr (&TREE_OPERAND (t, 2), pre_p, post_p,
1839 is_gimple_formal_tmp_reg, fb_rvalue);
1840 ret = MIN (ret, tret);
1846 /* Step 2 is to gimplify the base expression. Make sure lvalue is set
1847 so as to match the min_lval predicate. Failure to do so may result
1848 in the creation of large aggregate temporaries. */
1849 tret = gimplify_expr (p, pre_p, post_p, is_gimple_min_lval,
1850 fallback | fb_lvalue);
1851 ret = MIN (ret, tret);
1853 /* And finally, the indices and operands to BIT_FIELD_REF. During this
1854 loop we also remove any useless conversions. */
1855 for (; VEC_length (tree, stack) > 0; )
1857 tree t = VEC_pop (tree, stack);
1859 if (TREE_CODE (t) == ARRAY_REF || TREE_CODE (t) == ARRAY_RANGE_REF)
1861 /* Gimplify the dimension.
1862 Temporary fix for gcc.c-torture/execute/20040313-1.c.
1863 Gimplify non-constant array indices into a temporary
1865 FIXME - The real fix is to gimplify post-modify
1866 expressions into a minimal gimple lvalue. However, that
1867 exposes bugs in alias analysis. The alias analyzer does
1868 not handle &PTR->FIELD very well. Will fix after the
1869 branch is merged into mainline (dnovillo 2004-05-03). */
1870 if (!is_gimple_min_invariant (TREE_OPERAND (t, 1)))
1872 tret = gimplify_expr (&TREE_OPERAND (t, 1), pre_p, post_p,
1873 is_gimple_formal_tmp_reg, fb_rvalue);
1874 ret = MIN (ret, tret);
1877 else if (TREE_CODE (t) == BIT_FIELD_REF)
1879 tret = gimplify_expr (&TREE_OPERAND (t, 1), pre_p, post_p,
1880 is_gimple_val, fb_rvalue);
1881 ret = MIN (ret, tret);
1882 tret = gimplify_expr (&TREE_OPERAND (t, 2), pre_p, post_p,
1883 is_gimple_val, fb_rvalue);
1884 ret = MIN (ret, tret);
1887 STRIP_USELESS_TYPE_CONVERSION (TREE_OPERAND (t, 0));
1889 /* The innermost expression P may have originally had TREE_SIDE_EFFECTS
1890 set which would have caused all the outer expressions in EXPR_P
1891 leading to P to also have had TREE_SIDE_EFFECTS set. */
1892 recalculate_side_effects (t);
1895 tret = gimplify_expr (p, pre_p, post_p, is_gimple_min_lval, fallback);
1896 ret = MIN (ret, tret);
1898 /* If the outermost expression is a COMPONENT_REF, canonicalize its type. */
1899 if ((fallback & fb_rvalue) && TREE_CODE (*expr_p) == COMPONENT_REF)
1901 canonicalize_component_ref (expr_p);
1902 ret = MIN (ret, GS_OK);
1905 VEC_free (tree, heap, stack);
1910 /* Gimplify the self modifying expression pointed to by EXPR_P
1913 PRE_P points to the list where side effects that must happen before
1914 *EXPR_P should be stored.
1916 POST_P points to the list where side effects that must happen after
1917 *EXPR_P should be stored.
1919 WANT_VALUE is nonzero iff we want to use the value of this expression
1920 in another expression. */
1922 static enum gimplify_status
1923 gimplify_self_mod_expr (tree *expr_p, tree *pre_p, tree *post_p,
1926 enum tree_code code;
1927 tree lhs, lvalue, rhs, t1, post = NULL, *orig_post_p = post_p;
1929 enum tree_code arith_code;
1930 enum gimplify_status ret;
1932 code = TREE_CODE (*expr_p);
1934 gcc_assert (code == POSTINCREMENT_EXPR || code == POSTDECREMENT_EXPR
1935 || code == PREINCREMENT_EXPR || code == PREDECREMENT_EXPR);
1937 /* Prefix or postfix? */
1938 if (code == POSTINCREMENT_EXPR || code == POSTDECREMENT_EXPR)
1939 /* Faster to treat as prefix if result is not used. */
1940 postfix = want_value;
1944 /* For postfix, make sure the inner expression's post side effects
1945 are executed after side effects from this expression. */
1949 /* Add or subtract? */
1950 if (code == PREINCREMENT_EXPR || code == POSTINCREMENT_EXPR)
1951 arith_code = PLUS_EXPR;
1953 arith_code = MINUS_EXPR;
1955 /* Gimplify the LHS into a GIMPLE lvalue. */
1956 lvalue = TREE_OPERAND (*expr_p, 0);
1957 ret = gimplify_expr (&lvalue, pre_p, post_p, is_gimple_lvalue, fb_lvalue);
1958 if (ret == GS_ERROR)
1961 /* Extract the operands to the arithmetic operation. */
1963 rhs = TREE_OPERAND (*expr_p, 1);
1965 /* For postfix operator, we evaluate the LHS to an rvalue and then use
1966 that as the result value and in the postqueue operation. */
1969 ret = gimplify_expr (&lhs, pre_p, post_p, is_gimple_val, fb_rvalue);
1970 if (ret == GS_ERROR)
1974 /* For POINTERs increment, use POINTER_PLUS_EXPR. */
1975 if (POINTER_TYPE_P (TREE_TYPE (lhs)))
1977 rhs = fold_convert (sizetype, rhs);
1978 if (arith_code == MINUS_EXPR)
1979 rhs = fold_build1 (NEGATE_EXPR, TREE_TYPE (rhs), rhs);
1980 arith_code = POINTER_PLUS_EXPR;
1983 t1 = build2 (arith_code, TREE_TYPE (*expr_p), lhs, rhs);
1984 t1 = build_gimple_modify_stmt (lvalue, t1);
1988 gimplify_and_add (t1, orig_post_p);
1989 append_to_statement_list (post, orig_post_p);
2000 /* If *EXPR_P has a variable sized type, wrap it in a WITH_SIZE_EXPR. */
2003 maybe_with_size_expr (tree *expr_p)
2005 tree expr = *expr_p;
2006 tree type = TREE_TYPE (expr);
2009 /* If we've already wrapped this or the type is error_mark_node, we can't do
2011 if (TREE_CODE (expr) == WITH_SIZE_EXPR
2012 || type == error_mark_node)
2015 /* If the size isn't known or is a constant, we have nothing to do. */
2016 size = TYPE_SIZE_UNIT (type);
2017 if (!size || TREE_CODE (size) == INTEGER_CST)
2020 /* Otherwise, make a WITH_SIZE_EXPR. */
2021 size = unshare_expr (size);
2022 size = SUBSTITUTE_PLACEHOLDER_IN_EXPR (size, expr);
2023 *expr_p = build2 (WITH_SIZE_EXPR, type, expr, size);
2026 /* Subroutine of gimplify_call_expr: Gimplify a single argument. */
2028 static enum gimplify_status
2029 gimplify_arg (tree *expr_p, tree *pre_p)
2031 bool (*test) (tree);
2034 /* In general, we allow lvalues for function arguments to avoid
2035 extra overhead of copying large aggregates out of even larger
2036 aggregates into temporaries only to copy the temporaries to
2037 the argument list. Make optimizers happy by pulling out to
2038 temporaries those types that fit in registers. */
2039 if (is_gimple_reg_type (TREE_TYPE (*expr_p)))
2040 test = is_gimple_val, fb = fb_rvalue;
2042 test = is_gimple_lvalue, fb = fb_either;
2044 /* If this is a variable sized type, we must remember the size. */
2045 maybe_with_size_expr (expr_p);
2047 /* There is a sequence point before a function call. Side effects in
2048 the argument list must occur before the actual call. So, when
2049 gimplifying arguments, force gimplify_expr to use an internal
2050 post queue which is then appended to the end of PRE_P. */
2051 return gimplify_expr (expr_p, pre_p, NULL, test, fb);
2054 /* Gimplify the CALL_EXPR node pointed to by EXPR_P. PRE_P points to the
2055 list where side effects that must happen before *EXPR_P should be stored.
2056 WANT_VALUE is true if the result of the call is desired. */
2058 static enum gimplify_status
2059 gimplify_call_expr (tree *expr_p, tree *pre_p, bool want_value)
2061 tree decl, parms, p;
2062 enum gimplify_status ret;
2065 gcc_assert (TREE_CODE (*expr_p) == CALL_EXPR);
2067 /* For reliable diagnostics during inlining, it is necessary that
2068 every call_expr be annotated with file and line. */
2069 if (! EXPR_HAS_LOCATION (*expr_p))
2070 SET_EXPR_LOCATION (*expr_p, input_location);
2072 /* This may be a call to a builtin function.
2074 Builtin function calls may be transformed into different
2075 (and more efficient) builtin function calls under certain
2076 circumstances. Unfortunately, gimplification can muck things
2077 up enough that the builtin expanders are not aware that certain
2078 transformations are still valid.
2080 So we attempt transformation/gimplification of the call before
2081 we gimplify the CALL_EXPR. At this time we do not manage to
2082 transform all calls in the same manner as the expanders do, but
2083 we do transform most of them. */
2084 decl = get_callee_fndecl (*expr_p);
2085 if (decl && DECL_BUILT_IN (decl))
2087 tree new = fold_call_expr (*expr_p, !want_value);
2089 if (new && new != *expr_p)
2091 /* There was a transformation of this call which computes the
2092 same value, but in a more efficient way. Return and try
2098 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL
2099 && DECL_FUNCTION_CODE (decl) == BUILT_IN_VA_START)
2101 if (call_expr_nargs (*expr_p) < 2)
2103 error ("too few arguments to function %<va_start%>");
2104 *expr_p = build_empty_stmt ();
2108 if (fold_builtin_next_arg (*expr_p, true))
2110 *expr_p = build_empty_stmt ();
2113 /* Avoid gimplifying the second argument to va_start, which needs
2114 to be the plain PARM_DECL. */
2115 return gimplify_arg (&CALL_EXPR_ARG (*expr_p, 0), pre_p);
2119 /* There is a sequence point before the call, so any side effects in
2120 the calling expression must occur before the actual call. Force
2121 gimplify_expr to use an internal post queue. */
2122 ret = gimplify_expr (&CALL_EXPR_FN (*expr_p), pre_p, NULL,
2123 is_gimple_call_addr, fb_rvalue);
2125 nargs = call_expr_nargs (*expr_p);
2127 /* Get argument types for verification. */
2128 decl = get_callee_fndecl (*expr_p);
2131 parms = TYPE_ARG_TYPES (TREE_TYPE (decl));
2132 else if (POINTER_TYPE_P (TREE_TYPE (CALL_EXPR_FN (*expr_p))))
2133 parms = TYPE_ARG_TYPES (TREE_TYPE (TREE_TYPE (CALL_EXPR_FN (*expr_p))));
2135 /* Verify if the type of the argument matches that of the function
2136 declaration. If we cannot verify this or there is a mismatch,
2137 mark the call expression so it doesn't get inlined later. */
2140 for (i = 0, p = parms; i < nargs; i++, p = TREE_CHAIN (p))
2142 /* If this is a varargs function defer inlining decision
2146 if (TREE_VALUE (p) == error_mark_node
2147 || CALL_EXPR_ARG (*expr_p, i) == error_mark_node
2148 || TREE_CODE (TREE_VALUE (p)) == VOID_TYPE
2149 || !fold_convertible_p (TREE_VALUE (p),
2150 CALL_EXPR_ARG (*expr_p, i)))
2152 CALL_CANNOT_INLINE_P (*expr_p) = 1;
2157 else if (decl && DECL_ARGUMENTS (decl))
2159 for (i = 0, p = DECL_ARGUMENTS (decl); i < nargs;
2160 i++, p = TREE_CHAIN (p))
2162 || p == error_mark_node
2163 || CALL_EXPR_ARG (*expr_p, i) == error_mark_node
2164 || !fold_convertible_p (TREE_TYPE (p), CALL_EXPR_ARG (*expr_p, i)))
2166 CALL_CANNOT_INLINE_P (*expr_p) = 1;
2170 else if (nargs != 0)
2171 CALL_CANNOT_INLINE_P (*expr_p) = 1;
2173 /* Finally, gimplify the function arguments. */
2174 for (i = (PUSH_ARGS_REVERSED ? nargs - 1 : 0);
2175 PUSH_ARGS_REVERSED ? i >= 0 : i < nargs;
2176 PUSH_ARGS_REVERSED ? i-- : i++)
2178 enum gimplify_status t;
2180 t = gimplify_arg (&CALL_EXPR_ARG (*expr_p, i), pre_p);
2186 /* Try this again in case gimplification exposed something. */
2187 if (ret != GS_ERROR)
2189 tree new = fold_call_expr (*expr_p, !want_value);
2191 if (new && new != *expr_p)
2193 /* There was a transformation of this call which computes the
2194 same value, but in a more efficient way. Return and try
2201 /* If the function is "const" or "pure", then clear TREE_SIDE_EFFECTS on its
2202 decl. This allows us to eliminate redundant or useless
2203 calls to "const" functions. */
2204 if (TREE_CODE (*expr_p) == CALL_EXPR
2205 && (call_expr_flags (*expr_p) & (ECF_CONST | ECF_PURE)))
2206 TREE_SIDE_EFFECTS (*expr_p) = 0;
2211 /* Handle shortcut semantics in the predicate operand of a COND_EXPR by
2212 rewriting it into multiple COND_EXPRs, and possibly GOTO_EXPRs.
2214 TRUE_LABEL_P and FALSE_LABEL_P point to the labels to jump to if the
2215 condition is true or false, respectively. If null, we should generate
2216 our own to skip over the evaluation of this specific expression.
2218 This function is the tree equivalent of do_jump.
2220 shortcut_cond_r should only be called by shortcut_cond_expr. */
2223 shortcut_cond_r (tree pred, tree *true_label_p, tree *false_label_p)
2225 tree local_label = NULL_TREE;
2226 tree t, expr = NULL;
2228 /* OK, it's not a simple case; we need to pull apart the COND_EXPR to
2229 retain the shortcut semantics. Just insert the gotos here;
2230 shortcut_cond_expr will append the real blocks later. */
2231 if (TREE_CODE (pred) == TRUTH_ANDIF_EXPR)
2233 /* Turn if (a && b) into
2235 if (a); else goto no;
2236 if (b) goto yes; else goto no;
2239 if (false_label_p == NULL)
2240 false_label_p = &local_label;
2242 t = shortcut_cond_r (TREE_OPERAND (pred, 0), NULL, false_label_p);
2243 append_to_statement_list (t, &expr);
2245 t = shortcut_cond_r (TREE_OPERAND (pred, 1), true_label_p,
2247 append_to_statement_list (t, &expr);
2249 else if (TREE_CODE (pred) == TRUTH_ORIF_EXPR)
2251 /* Turn if (a || b) into
2254 if (b) goto yes; else goto no;
2257 if (true_label_p == NULL)
2258 true_label_p = &local_label;
2260 t = shortcut_cond_r (TREE_OPERAND (pred, 0), true_label_p, NULL);
2261 append_to_statement_list (t, &expr);
2263 t = shortcut_cond_r (TREE_OPERAND (pred, 1), true_label_p,
2265 append_to_statement_list (t, &expr);
2267 else if (TREE_CODE (pred) == COND_EXPR)
2269 /* As long as we're messing with gotos, turn if (a ? b : c) into
2271 if (b) goto yes; else goto no;
2273 if (c) goto yes; else goto no; */
2274 expr = build3 (COND_EXPR, void_type_node, TREE_OPERAND (pred, 0),
2275 shortcut_cond_r (TREE_OPERAND (pred, 1), true_label_p,
2277 shortcut_cond_r (TREE_OPERAND (pred, 2), true_label_p,
2282 expr = build3 (COND_EXPR, void_type_node, pred,
2283 build_and_jump (true_label_p),
2284 build_and_jump (false_label_p));
2289 t = build1 (LABEL_EXPR, void_type_node, local_label);
2290 append_to_statement_list (t, &expr);
2297 shortcut_cond_expr (tree expr)
2299 tree pred = TREE_OPERAND (expr, 0);
2300 tree then_ = TREE_OPERAND (expr, 1);
2301 tree else_ = TREE_OPERAND (expr, 2);
2302 tree true_label, false_label, end_label, t;
2304 tree *false_label_p;
2305 bool emit_end, emit_false, jump_over_else;
2306 bool then_se = then_ && TREE_SIDE_EFFECTS (then_);
2307 bool else_se = else_ && TREE_SIDE_EFFECTS (else_);
2309 /* First do simple transformations. */
2312 /* If there is no 'else', turn (a && b) into if (a) if (b). */
2313 while (TREE_CODE (pred) == TRUTH_ANDIF_EXPR)
2315 TREE_OPERAND (expr, 0) = TREE_OPERAND (pred, 1);
2316 then_ = shortcut_cond_expr (expr);
2317 then_se = then_ && TREE_SIDE_EFFECTS (then_);
2318 pred = TREE_OPERAND (pred, 0);
2319 expr = build3 (COND_EXPR, void_type_node, pred, then_, NULL_TREE);
2324 /* If there is no 'then', turn
2327 if (a); else if (b); else d. */
2328 while (TREE_CODE (pred) == TRUTH_ORIF_EXPR)
2330 TREE_OPERAND (expr, 0) = TREE_OPERAND (pred, 1);
2331 else_ = shortcut_cond_expr (expr);
2332 else_se = else_ && TREE_SIDE_EFFECTS (else_);
2333 pred = TREE_OPERAND (pred, 0);
2334 expr = build3 (COND_EXPR, void_type_node, pred, NULL_TREE, else_);
2338 /* If we're done, great. */
2339 if (TREE_CODE (pred) != TRUTH_ANDIF_EXPR
2340 && TREE_CODE (pred) != TRUTH_ORIF_EXPR)
2343 /* Otherwise we need to mess with gotos. Change
2346 if (a); else goto no;
2349 and recursively gimplify the condition. */
2351 true_label = false_label = end_label = NULL_TREE;
2353 /* If our arms just jump somewhere, hijack those labels so we don't
2354 generate jumps to jumps. */
2357 && TREE_CODE (then_) == GOTO_EXPR
2358 && TREE_CODE (GOTO_DESTINATION (then_)) == LABEL_DECL)
2360 true_label = GOTO_DESTINATION (then_);
2366 && TREE_CODE (else_) == GOTO_EXPR
2367 && TREE_CODE (GOTO_DESTINATION (else_)) == LABEL_DECL)
2369 false_label = GOTO_DESTINATION (else_);
2374 /* If we aren't hijacking a label for the 'then' branch, it falls through. */
2376 true_label_p = &true_label;
2378 true_label_p = NULL;
2380 /* The 'else' branch also needs a label if it contains interesting code. */
2381 if (false_label || else_se)
2382 false_label_p = &false_label;
2384 false_label_p = NULL;
2386 /* If there was nothing else in our arms, just forward the label(s). */
2387 if (!then_se && !else_se)
2388 return shortcut_cond_r (pred, true_label_p, false_label_p);
2390 /* If our last subexpression already has a terminal label, reuse it. */
2392 expr = expr_last (else_);
2394 expr = expr_last (then_);
2397 if (expr && TREE_CODE (expr) == LABEL_EXPR)
2398 end_label = LABEL_EXPR_LABEL (expr);
2400 /* If we don't care about jumping to the 'else' branch, jump to the end
2401 if the condition is false. */
2403 false_label_p = &end_label;
2405 /* We only want to emit these labels if we aren't hijacking them. */
2406 emit_end = (end_label == NULL_TREE);
2407 emit_false = (false_label == NULL_TREE);
2409 /* We only emit the jump over the else clause if we have to--if the
2410 then clause may fall through. Otherwise we can wind up with a
2411 useless jump and a useless label at the end of gimplified code,
2412 which will cause us to think that this conditional as a whole
2413 falls through even if it doesn't. If we then inline a function
2414 which ends with such a condition, that can cause us to issue an
2415 inappropriate warning about control reaching the end of a
2416 non-void function. */
2417 jump_over_else = block_may_fallthru (then_);
2419 pred = shortcut_cond_r (pred, true_label_p, false_label_p);
2422 append_to_statement_list (pred, &expr);
2424 append_to_statement_list (then_, &expr);
2429 t = build_and_jump (&end_label);
2430 append_to_statement_list (t, &expr);
2434 t = build1 (LABEL_EXPR, void_type_node, false_label);
2435 append_to_statement_list (t, &expr);
2437 append_to_statement_list (else_, &expr);
2439 if (emit_end && end_label)
2441 t = build1 (LABEL_EXPR, void_type_node, end_label);
2442 append_to_statement_list (t, &expr);
2448 /* EXPR is used in a boolean context; make sure it has BOOLEAN_TYPE. */
2451 gimple_boolify (tree expr)
2453 tree type = TREE_TYPE (expr);
2455 if (TREE_CODE (type) == BOOLEAN_TYPE)
2458 switch (TREE_CODE (expr))
2460 case TRUTH_AND_EXPR:
2462 case TRUTH_XOR_EXPR:
2463 case TRUTH_ANDIF_EXPR:
2464 case TRUTH_ORIF_EXPR:
2465 /* Also boolify the arguments of truth exprs. */
2466 TREE_OPERAND (expr, 1) = gimple_boolify (TREE_OPERAND (expr, 1));
2469 case TRUTH_NOT_EXPR:
2470 TREE_OPERAND (expr, 0) = gimple_boolify (TREE_OPERAND (expr, 0));
2473 case EQ_EXPR: case NE_EXPR:
2474 case LE_EXPR: case GE_EXPR: case LT_EXPR: case GT_EXPR:
2475 /* These expressions always produce boolean results. */
2476 TREE_TYPE (expr) = boolean_type_node;
2480 /* Other expressions that get here must have boolean values, but
2481 might need to be converted to the appropriate mode. */
2482 return fold_convert (boolean_type_node, expr);
2486 /* Convert the conditional expression pointed to by EXPR_P '(p) ? a : b;'
2495 The second form is used when *EXPR_P is of type void.
2497 TARGET is the tree for T1 above.
2499 PRE_P points to the list where side effects that must happen before
2500 *EXPR_P should be stored. */
2502 static enum gimplify_status
2503 gimplify_cond_expr (tree *expr_p, tree *pre_p, fallback_t fallback)
2505 tree expr = *expr_p;
2506 tree tmp, tmp2, type;
2507 enum gimplify_status ret;
2509 type = TREE_TYPE (expr);
2511 /* If this COND_EXPR has a value, copy the values into a temporary within
2513 if (! VOID_TYPE_P (type))
2517 if ((fallback & fb_lvalue) == 0)
2519 result = tmp2 = tmp = create_tmp_var (TREE_TYPE (expr), "iftmp");
2524 tree type = build_pointer_type (TREE_TYPE (expr));
2526 if (TREE_TYPE (TREE_OPERAND (expr, 1)) != void_type_node)
2527 TREE_OPERAND (expr, 1) =
2528 build_fold_addr_expr (TREE_OPERAND (expr, 1));
2530 if (TREE_TYPE (TREE_OPERAND (expr, 2)) != void_type_node)
2531 TREE_OPERAND (expr, 2) =
2532 build_fold_addr_expr (TREE_OPERAND (expr, 2));
2534 tmp2 = tmp = create_tmp_var (type, "iftmp");
2536 expr = build3 (COND_EXPR, void_type_node, TREE_OPERAND (expr, 0),
2537 TREE_OPERAND (expr, 1), TREE_OPERAND (expr, 2));
2539 result = build_fold_indirect_ref (tmp);
2543 /* Build the then clause, 't1 = a;'. But don't build an assignment
2544 if this branch is void; in C++ it can be, if it's a throw. */
2545 if (TREE_TYPE (TREE_OPERAND (expr, 1)) != void_type_node)
2546 TREE_OPERAND (expr, 1)
2547 = build_gimple_modify_stmt (tmp, TREE_OPERAND (expr, 1));
2549 /* Build the else clause, 't1 = b;'. */
2550 if (TREE_TYPE (TREE_OPERAND (expr, 2)) != void_type_node)
2551 TREE_OPERAND (expr, 2)
2552 = build_gimple_modify_stmt (tmp2, TREE_OPERAND (expr, 2));
2554 TREE_TYPE (expr) = void_type_node;
2555 recalculate_side_effects (expr);
2557 /* Move the COND_EXPR to the prequeue. */
2558 gimplify_and_add (expr, pre_p);
2564 /* Make sure the condition has BOOLEAN_TYPE. */
2565 TREE_OPERAND (expr, 0) = gimple_boolify (TREE_OPERAND (expr, 0));
2567 /* Break apart && and || conditions. */
2568 if (TREE_CODE (TREE_OPERAND (expr, 0)) == TRUTH_ANDIF_EXPR
2569 || TREE_CODE (TREE_OPERAND (expr, 0)) == TRUTH_ORIF_EXPR)
2571 expr = shortcut_cond_expr (expr);
2573 if (expr != *expr_p)
2577 /* We can't rely on gimplify_expr to re-gimplify the expanded
2578 form properly, as cleanups might cause the target labels to be
2579 wrapped in a TRY_FINALLY_EXPR. To prevent that, we need to
2580 set up a conditional context. */
2581 gimple_push_condition ();
2582 gimplify_stmt (expr_p);
2583 gimple_pop_condition (pre_p);
2589 /* Now do the normal gimplification. */
2590 ret = gimplify_expr (&TREE_OPERAND (expr, 0), pre_p, NULL,
2591 is_gimple_condexpr, fb_rvalue);
2593 gimple_push_condition ();
2595 gimplify_to_stmt_list (&TREE_OPERAND (expr, 1));
2596 gimplify_to_stmt_list (&TREE_OPERAND (expr, 2));
2597 recalculate_side_effects (expr);
2599 gimple_pop_condition (pre_p);
2601 if (ret == GS_ERROR)
2603 else if (TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 1)))
2605 else if (TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 2)))
2606 /* Rewrite "if (a); else b" to "if (!a) b" */
2608 TREE_OPERAND (expr, 0) = invert_truthvalue (TREE_OPERAND (expr, 0));
2609 ret = gimplify_expr (&TREE_OPERAND (expr, 0), pre_p, NULL,
2610 is_gimple_condexpr, fb_rvalue);
2612 tmp = TREE_OPERAND (expr, 1);
2613 TREE_OPERAND (expr, 1) = TREE_OPERAND (expr, 2);
2614 TREE_OPERAND (expr, 2) = tmp;
2617 /* Both arms are empty; replace the COND_EXPR with its predicate. */
2618 expr = TREE_OPERAND (expr, 0);
2624 /* A subroutine of gimplify_modify_expr. Replace a MODIFY_EXPR with
2625 a call to __builtin_memcpy. */
2627 static enum gimplify_status
2628 gimplify_modify_expr_to_memcpy (tree *expr_p, tree size, bool want_value)
2630 tree t, to, to_ptr, from, from_ptr;
2632 to = GENERIC_TREE_OPERAND (*expr_p, 0);
2633 from = GENERIC_TREE_OPERAND (*expr_p, 1);
2635 from_ptr = build_fold_addr_expr (from);
2637 to_ptr = build_fold_addr_expr (to);
2638 t = implicit_built_in_decls[BUILT_IN_MEMCPY];
2639 t = build_call_expr (t, 3, to_ptr, from_ptr, size);
2643 t = build1 (NOP_EXPR, TREE_TYPE (to_ptr), t);
2644 t = build1 (INDIRECT_REF, TREE_TYPE (to), t);
2651 /* A subroutine of gimplify_modify_expr. Replace a MODIFY_EXPR with
2652 a call to __builtin_memset. In this case we know that the RHS is
2653 a CONSTRUCTOR with an empty element list. */
2655 static enum gimplify_status
2656 gimplify_modify_expr_to_memset (tree *expr_p, tree size, bool want_value)
2660 to = GENERIC_TREE_OPERAND (*expr_p, 0);
2662 to_ptr = build_fold_addr_expr (to);
2663 t = implicit_built_in_decls[BUILT_IN_MEMSET];
2664 t = build_call_expr (t, 3, to_ptr, integer_zero_node, size);
2668 t = build1 (NOP_EXPR, TREE_TYPE (to_ptr), t);
2669 t = build1 (INDIRECT_REF, TREE_TYPE (to), t);
2676 /* A subroutine of gimplify_init_ctor_preeval. Called via walk_tree,
2677 determine, cautiously, if a CONSTRUCTOR overlaps the lhs of an
2678 assignment. Returns non-null if we detect a potential overlap. */
2680 struct gimplify_init_ctor_preeval_data
2682 /* The base decl of the lhs object. May be NULL, in which case we
2683 have to assume the lhs is indirect. */
2686 /* The alias set of the lhs object. */
2691 gimplify_init_ctor_preeval_1 (tree *tp, int *walk_subtrees, void *xdata)
2693 struct gimplify_init_ctor_preeval_data *data
2694 = (struct gimplify_init_ctor_preeval_data *) xdata;
2697 /* If we find the base object, obviously we have overlap. */
2698 if (data->lhs_base_decl == t)
2701 /* If the constructor component is indirect, determine if we have a
2702 potential overlap with the lhs. The only bits of information we
2703 have to go on at this point are addressability and alias sets. */
2704 if (TREE_CODE (t) == INDIRECT_REF
2705 && (!data->lhs_base_decl || TREE_ADDRESSABLE (data->lhs_base_decl))
2706 && alias_sets_conflict_p (data->lhs_alias_set, get_alias_set (t)))
2709 /* If the constructor component is a call, determine if it can hide a
2710 potential overlap with the lhs through an INDIRECT_REF like above. */
2711 if (TREE_CODE (t) == CALL_EXPR)
2713 tree type, fntype = TREE_TYPE (TREE_TYPE (CALL_EXPR_FN (t)));
2715 for (type = TYPE_ARG_TYPES (fntype); type; type = TREE_CHAIN (type))
2716 if (POINTER_TYPE_P (TREE_VALUE (type))
2717 && (!data->lhs_base_decl || TREE_ADDRESSABLE (data->lhs_base_decl))
2718 && alias_sets_conflict_p (data->lhs_alias_set,
2720 (TREE_TYPE (TREE_VALUE (type)))))
2724 if (IS_TYPE_OR_DECL_P (t))
2729 /* A subroutine of gimplify_init_constructor. Pre-evaluate *EXPR_P,
2730 force values that overlap with the lhs (as described by *DATA)
2731 into temporaries. */
2734 gimplify_init_ctor_preeval (tree *expr_p, tree *pre_p, tree *post_p,
2735 struct gimplify_init_ctor_preeval_data *data)
2737 enum gimplify_status one;
2739 /* If the value is invariant, then there's nothing to pre-evaluate.
2740 But ensure it doesn't have any side-effects since a SAVE_EXPR is
2741 invariant but has side effects and might contain a reference to
2742 the object we're initializing. */
2743 if (TREE_INVARIANT (*expr_p) && !TREE_SIDE_EFFECTS (*expr_p))
2746 /* If the type has non-trivial constructors, we can't pre-evaluate. */
2747 if (TREE_ADDRESSABLE (TREE_TYPE (*expr_p)))
2750 /* Recurse for nested constructors. */
2751 if (TREE_CODE (*expr_p) == CONSTRUCTOR)
2753 unsigned HOST_WIDE_INT ix;
2754 constructor_elt *ce;
2755 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (*expr_p);
2757 for (ix = 0; VEC_iterate (constructor_elt, v, ix, ce); ix++)
2758 gimplify_init_ctor_preeval (&ce->value, pre_p, post_p, data);
2762 /* If this is a variable sized type, we must remember the size. */
2763 maybe_with_size_expr (expr_p);
2765 /* Gimplify the constructor element to something appropriate for the rhs
2766 of a MODIFY_EXPR. Given that we know the lhs is an aggregate, we know
2767 the gimplifier will consider this a store to memory. Doing this
2768 gimplification now means that we won't have to deal with complicated
2769 language-specific trees, nor trees like SAVE_EXPR that can induce
2770 exponential search behavior. */
2771 one = gimplify_expr (expr_p, pre_p, post_p, is_gimple_mem_rhs, fb_rvalue);
2772 if (one == GS_ERROR)
2778 /* If we gimplified to a bare decl, we can be sure that it doesn't overlap
2779 with the lhs, since "a = { .x=a }" doesn't make sense. This will
2780 always be true for all scalars, since is_gimple_mem_rhs insists on a
2781 temporary variable for them. */
2782 if (DECL_P (*expr_p))
2785 /* If this is of variable size, we have no choice but to assume it doesn't
2786 overlap since we can't make a temporary for it. */
2787 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (*expr_p))) != INTEGER_CST)
2790 /* Otherwise, we must search for overlap ... */
2791 if (!walk_tree (expr_p, gimplify_init_ctor_preeval_1, data, NULL))
2794 /* ... and if found, force the value into a temporary. */
2795 *expr_p = get_formal_tmp_var (*expr_p, pre_p);
2798 /* A subroutine of gimplify_init_ctor_eval. Create a loop for
2799 a RANGE_EXPR in a CONSTRUCTOR for an array.
2803 object[var] = value;
2810 We increment var _after_ the loop exit check because we might otherwise
2811 fail if upper == TYPE_MAX_VALUE (type for upper).
2813 Note that we never have to deal with SAVE_EXPRs here, because this has
2814 already been taken care of for us, in gimplify_init_ctor_preeval(). */
2816 static void gimplify_init_ctor_eval (tree, VEC(constructor_elt,gc) *,
2820 gimplify_init_ctor_eval_range (tree object, tree lower, tree upper,
2821 tree value, tree array_elt_type,
2822 tree *pre_p, bool cleared)
2824 tree loop_entry_label, loop_exit_label;
2825 tree var, var_type, cref, tmp;
2827 loop_entry_label = create_artificial_label ();
2828 loop_exit_label = create_artificial_label ();
2830 /* Create and initialize the index variable. */
2831 var_type = TREE_TYPE (upper);
2832 var = create_tmp_var (var_type, NULL);
2833 append_to_statement_list (build_gimple_modify_stmt (var, lower), pre_p);
2835 /* Add the loop entry label. */
2836 append_to_statement_list (build1 (LABEL_EXPR,
2841 /* Build the reference. */
2842 cref = build4 (ARRAY_REF, array_elt_type, unshare_expr (object),
2843 var, NULL_TREE, NULL_TREE);
2845 /* If we are a constructor, just call gimplify_init_ctor_eval to do
2846 the store. Otherwise just assign value to the reference. */
2848 if (TREE_CODE (value) == CONSTRUCTOR)
2849 /* NB we might have to call ourself recursively through
2850 gimplify_init_ctor_eval if the value is a constructor. */
2851 gimplify_init_ctor_eval (cref, CONSTRUCTOR_ELTS (value),
2854 append_to_statement_list (build_gimple_modify_stmt (cref, value), pre_p);
2856 /* We exit the loop when the index var is equal to the upper bound. */
2857 gimplify_and_add (build3 (COND_EXPR, void_type_node,
2858 build2 (EQ_EXPR, boolean_type_node,
2866 /* Otherwise, increment the index var... */
2867 tmp = build2 (PLUS_EXPR, var_type, var,
2868 fold_convert (var_type, integer_one_node));
2869 append_to_statement_list (build_gimple_modify_stmt (var, tmp), pre_p);
2871 /* ...and jump back to the loop entry. */
2872 append_to_statement_list (build1 (GOTO_EXPR,
2877 /* Add the loop exit label. */
2878 append_to_statement_list (build1 (LABEL_EXPR,
2884 /* Return true if FDECL is accessing a field that is zero sized. */
2887 zero_sized_field_decl (tree fdecl)
2889 if (TREE_CODE (fdecl) == FIELD_DECL && DECL_SIZE (fdecl)
2890 && integer_zerop (DECL_SIZE (fdecl)))
2895 /* Return true if TYPE is zero sized. */
2898 zero_sized_type (tree type)
2900 if (AGGREGATE_TYPE_P (type) && TYPE_SIZE (type)
2901 && integer_zerop (TYPE_SIZE (type)))
2906 /* A subroutine of gimplify_init_constructor. Generate individual
2907 MODIFY_EXPRs for a CONSTRUCTOR. OBJECT is the LHS against which the
2908 assignments should happen. ELTS is the CONSTRUCTOR_ELTS of the
2909 CONSTRUCTOR. CLEARED is true if the entire LHS object has been
2913 gimplify_init_ctor_eval (tree object, VEC(constructor_elt,gc) *elts,
2914 tree *pre_p, bool cleared)
2916 tree array_elt_type = NULL;
2917 unsigned HOST_WIDE_INT ix;
2918 tree purpose, value;
2920 if (TREE_CODE (TREE_TYPE (object)) == ARRAY_TYPE)
2921 array_elt_type = TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (object)));
2923 FOR_EACH_CONSTRUCTOR_ELT (elts, ix, purpose, value)
2927 /* NULL values are created above for gimplification errors. */
2931 if (cleared && initializer_zerop (value))
2934 /* ??? Here's to hoping the front end fills in all of the indices,
2935 so we don't have to figure out what's missing ourselves. */
2936 gcc_assert (purpose);
2938 /* Skip zero-sized fields, unless value has side-effects. This can
2939 happen with calls to functions returning a zero-sized type, which
2940 we shouldn't discard. As a number of downstream passes don't
2941 expect sets of zero-sized fields, we rely on the gimplification of
2942 the MODIFY_EXPR we make below to drop the assignment statement. */
2943 if (! TREE_SIDE_EFFECTS (value) && zero_sized_field_decl (purpose))
2946 /* If we have a RANGE_EXPR, we have to build a loop to assign the
2948 if (TREE_CODE (purpose) == RANGE_EXPR)
2950 tree lower = TREE_OPERAND (purpose, 0);
2951 tree upper = TREE_OPERAND (purpose, 1);
2953 /* If the lower bound is equal to upper, just treat it as if
2954 upper was the index. */
2955 if (simple_cst_equal (lower, upper))
2959 gimplify_init_ctor_eval_range (object, lower, upper, value,
2960 array_elt_type, pre_p, cleared);
2967 cref = build4 (ARRAY_REF, array_elt_type, unshare_expr (object),
2968 purpose, NULL_TREE, NULL_TREE);
2972 gcc_assert (TREE_CODE (purpose) == FIELD_DECL);
2973 cref = build3 (COMPONENT_REF, TREE_TYPE (purpose),
2974 unshare_expr (object), purpose, NULL_TREE);
2977 if (TREE_CODE (value) == CONSTRUCTOR
2978 && TREE_CODE (TREE_TYPE (value)) != VECTOR_TYPE)
2979 gimplify_init_ctor_eval (cref, CONSTRUCTOR_ELTS (value),
2983 init = build2 (INIT_EXPR, TREE_TYPE (cref), cref, value);
2984 gimplify_and_add (init, pre_p);
2989 /* A subroutine of gimplify_modify_expr. Break out elements of a
2990 CONSTRUCTOR used as an initializer into separate MODIFY_EXPRs.
2992 Note that we still need to clear any elements that don't have explicit
2993 initializers, so if not all elements are initialized we keep the
2994 original MODIFY_EXPR, we just remove all of the constructor elements. */
2996 static enum gimplify_status
2997 gimplify_init_constructor (tree *expr_p, tree *pre_p,
2998 tree *post_p, bool want_value)
3001 tree ctor = GENERIC_TREE_OPERAND (*expr_p, 1);
3002 tree type = TREE_TYPE (ctor);
3003 enum gimplify_status ret;
3004 VEC(constructor_elt,gc) *elts;
3006 if (TREE_CODE (ctor) != CONSTRUCTOR)
3007 return GS_UNHANDLED;
3009 ret = gimplify_expr (&GENERIC_TREE_OPERAND (*expr_p, 0), pre_p, post_p,
3010 is_gimple_lvalue, fb_lvalue);
3011 if (ret == GS_ERROR)
3013 object = GENERIC_TREE_OPERAND (*expr_p, 0);
3015 elts = CONSTRUCTOR_ELTS (ctor);
3018 switch (TREE_CODE (type))
3022 case QUAL_UNION_TYPE:
3025 struct gimplify_init_ctor_preeval_data preeval_data;
3026 HOST_WIDE_INT num_type_elements, num_ctor_elements;
3027 HOST_WIDE_INT num_nonzero_elements;
3028 bool cleared, valid_const_initializer;
3030 /* Aggregate types must lower constructors to initialization of
3031 individual elements. The exception is that a CONSTRUCTOR node
3032 with no elements indicates zero-initialization of the whole. */
3033 if (VEC_empty (constructor_elt, elts))
3036 /* Fetch information about the constructor to direct later processing.
3037 We might want to make static versions of it in various cases, and
3038 can only do so if it known to be a valid constant initializer. */
3039 valid_const_initializer
3040 = categorize_ctor_elements (ctor, &num_nonzero_elements,
3041 &num_ctor_elements, &cleared);
3043 /* If a const aggregate variable is being initialized, then it
3044 should never be a lose to promote the variable to be static. */
3045 if (valid_const_initializer
3046 && num_nonzero_elements > 1
3047 && TREE_READONLY (object)
3048 && TREE_CODE (object) == VAR_DECL)
3050 DECL_INITIAL (object) = ctor;
3051 TREE_STATIC (object) = 1;
3052 if (!DECL_NAME (object))
3053 DECL_NAME (object) = create_tmp_var_name ("C");
3054 walk_tree (&DECL_INITIAL (object), force_labels_r, NULL, NULL);
3056 /* ??? C++ doesn't automatically append a .<number> to the
3057 assembler name, and even when it does, it looks a FE private
3058 data structures to figure out what that number should be,
3059 which are not set for this variable. I suppose this is
3060 important for local statics for inline functions, which aren't
3061 "local" in the object file sense. So in order to get a unique
3062 TU-local symbol, we must invoke the lhd version now. */
3063 lhd_set_decl_assembler_name (object);
3065 *expr_p = NULL_TREE;
3069 /* If there are "lots" of initialized elements, even discounting
3070 those that are not address constants (and thus *must* be
3071 computed at runtime), then partition the constructor into
3072 constant and non-constant parts. Block copy the constant
3073 parts in, then generate code for the non-constant parts. */
3074 /* TODO. There's code in cp/typeck.c to do this. */
3076 num_type_elements = count_type_elements (type, true);
3078 /* If count_type_elements could not determine number of type elements
3079 for a constant-sized object, assume clearing is needed.
3080 Don't do this for variable-sized objects, as store_constructor
3081 will ignore the clearing of variable-sized objects. */
3082 if (num_type_elements < 0 && int_size_in_bytes (type) >= 0)
3084 /* If there are "lots" of zeros, then block clear the object first. */
3085 else if (num_type_elements - num_nonzero_elements > CLEAR_RATIO
3086 && num_nonzero_elements < num_type_elements/4)
3088 /* ??? This bit ought not be needed. For any element not present
3089 in the initializer, we should simply set them to zero. Except
3090 we'd need to *find* the elements that are not present, and that
3091 requires trickery to avoid quadratic compile-time behavior in
3092 large cases or excessive memory use in small cases. */
3093 else if (num_ctor_elements < num_type_elements)
3096 /* If there are "lots" of initialized elements, and all of them
3097 are valid address constants, then the entire initializer can
3098 be dropped to memory, and then memcpy'd out. Don't do this
3099 for sparse arrays, though, as it's more efficient to follow
3100 the standard CONSTRUCTOR behavior of memset followed by
3101 individual element initialization. */
3102 if (valid_const_initializer && !cleared)
3104 HOST_WIDE_INT size = int_size_in_bytes (type);
3107 /* ??? We can still get unbounded array types, at least
3108 from the C++ front end. This seems wrong, but attempt
3109 to work around it for now. */
3112 size = int_size_in_bytes (TREE_TYPE (object));
3114 TREE_TYPE (ctor) = type = TREE_TYPE (object);
3117 /* Find the maximum alignment we can assume for the object. */
3118 /* ??? Make use of DECL_OFFSET_ALIGN. */
3119 if (DECL_P (object))
3120 align = DECL_ALIGN (object);
3122 align = TYPE_ALIGN (type);
3124 if (size > 0 && !can_move_by_pieces (size, align))
3126 tree new = create_tmp_var_raw (type, "C");
3128 gimple_add_tmp_var (new);
3129 TREE_STATIC (new) = 1;
3130 TREE_READONLY (new) = 1;
3131 DECL_INITIAL (new) = ctor;
3132 if (align > DECL_ALIGN (new))
3134 DECL_ALIGN (new) = align;
3135 DECL_USER_ALIGN (new) = 1;
3137 walk_tree (&DECL_INITIAL (new), force_labels_r, NULL, NULL);
3139 GENERIC_TREE_OPERAND (*expr_p, 1) = new;
3141 /* This is no longer an assignment of a CONSTRUCTOR, but
3142 we still may have processing to do on the LHS. So
3143 pretend we didn't do anything here to let that happen. */
3144 return GS_UNHANDLED;
3148 /* If there are nonzero elements, pre-evaluate to capture elements
3149 overlapping with the lhs into temporaries. We must do this before
3150 clearing to fetch the values before they are zeroed-out. */
3151 if (num_nonzero_elements > 0)
3153 preeval_data.lhs_base_decl = get_base_address (object);
3154 if (!DECL_P (preeval_data.lhs_base_decl))
3155 preeval_data.lhs_base_decl = NULL;
3156 preeval_data.lhs_alias_set = get_alias_set (object);
3158 gimplify_init_ctor_preeval (&GENERIC_TREE_OPERAND (*expr_p, 1),
3159 pre_p, post_p, &preeval_data);
3164 /* Zap the CONSTRUCTOR element list, which simplifies this case.
3165 Note that we still have to gimplify, in order to handle the
3166 case of variable sized types. Avoid shared tree structures. */
3167 CONSTRUCTOR_ELTS (ctor) = NULL;
3168 object = unshare_expr (object);
3169 gimplify_stmt (expr_p);
3170 append_to_statement_list (*expr_p, pre_p);
3173 /* If we have not block cleared the object, or if there are nonzero
3174 elements in the constructor, add assignments to the individual
3175 scalar fields of the object. */
3176 if (!cleared || num_nonzero_elements > 0)
3177 gimplify_init_ctor_eval (object, elts, pre_p, cleared);
3179 *expr_p = NULL_TREE;
3187 /* Extract the real and imaginary parts out of the ctor. */
3188 gcc_assert (VEC_length (constructor_elt, elts) == 2);
3189 r = VEC_index (constructor_elt, elts, 0)->value;
3190 i = VEC_index (constructor_elt, elts, 1)->value;
3191 if (r == NULL || i == NULL)
3193 tree zero = fold_convert (TREE_TYPE (type), integer_zero_node);
3200 /* Complex types have either COMPLEX_CST or COMPLEX_EXPR to
3201 represent creation of a complex value. */
3202 if (TREE_CONSTANT (r) && TREE_CONSTANT (i))
3204 ctor = build_complex (type, r, i);
3205 TREE_OPERAND (*expr_p, 1) = ctor;
3209 ctor = build2 (COMPLEX_EXPR, type, r, i);
3210 TREE_OPERAND (*expr_p, 1) = ctor;
3211 ret = gimplify_expr (&TREE_OPERAND (*expr_p, 1), pre_p, post_p,
3212 rhs_predicate_for (TREE_OPERAND (*expr_p, 0)),
3220 unsigned HOST_WIDE_INT ix;
3221 constructor_elt *ce;
3223 /* Go ahead and simplify constant constructors to VECTOR_CST. */
3224 if (TREE_CONSTANT (ctor))
3226 bool constant_p = true;
3229 /* Even when ctor is constant, it might contain non-*_CST
3230 elements (e.g. { 1.0/0.0 - 1.0/0.0, 0.0 }) and those don't
3231 belong into VECTOR_CST nodes. */
3232 FOR_EACH_CONSTRUCTOR_VALUE (elts, ix, value)
3233 if (!CONSTANT_CLASS_P (value))
3241 TREE_OPERAND (*expr_p, 1) = build_vector_from_ctor (type, elts);
3245 /* Don't reduce a TREE_CONSTANT vector ctor even if we can't
3246 make a VECTOR_CST. It won't do anything for us, and it'll
3247 prevent us from representing it as a single constant. */
3251 /* Vector types use CONSTRUCTOR all the way through gimple
3252 compilation as a general initializer. */
3253 for (ix = 0; VEC_iterate (constructor_elt, elts, ix, ce); ix++)
3255 enum gimplify_status tret;
3256 tret = gimplify_expr (&ce->value, pre_p, post_p,
3257 is_gimple_val, fb_rvalue);
3258 if (tret == GS_ERROR)
3261 if (!is_gimple_reg (GENERIC_TREE_OPERAND (*expr_p, 0)))
3262 GENERIC_TREE_OPERAND (*expr_p, 1) = get_formal_tmp_var (ctor, pre_p);
3267 /* So how did we get a CONSTRUCTOR for a scalar type? */
3271 if (ret == GS_ERROR)
3273 else if (want_value)
3275 append_to_statement_list (*expr_p, pre_p);
3283 /* Given a pointer value OP0, return a simplified version of an
3284 indirection through OP0, or NULL_TREE if no simplification is
3285 possible. This may only be applied to a rhs of an expression.
3286 Note that the resulting type may be different from the type pointed
3287 to in the sense that it is still compatible from the langhooks
3291 fold_indirect_ref_rhs (tree t)
3293 tree type = TREE_TYPE (TREE_TYPE (t));
3297 STRIP_USELESS_TYPE_CONVERSION (sub);
3298 subtype = TREE_TYPE (sub);
3299 if (!POINTER_TYPE_P (subtype))
3302 if (TREE_CODE (sub) == ADDR_EXPR)
3304 tree op = TREE_OPERAND (sub, 0);
3305 tree optype = TREE_TYPE (op);
3307 if (useless_type_conversion_p (type, optype))
3309 /* *(foo *)&fooarray => fooarray[0] */
3310 else if (TREE_CODE (optype) == ARRAY_TYPE
3311 && useless_type_conversion_p (type, TREE_TYPE (optype)))
3313 tree type_domain = TYPE_DOMAIN (optype);
3314 tree min_val = size_zero_node;
3315 if (type_domain && TYPE_MIN_VALUE (type_domain))
3316 min_val = TYPE_MIN_VALUE (type_domain);
3317 return build4 (ARRAY_REF, type, op, min_val, NULL_TREE, NULL_TREE);
3321 /* *(foo *)fooarrptr => (*fooarrptr)[0] */
3322 if (TREE_CODE (TREE_TYPE (subtype)) == ARRAY_TYPE
3323 && useless_type_conversion_p (type, TREE_TYPE (TREE_TYPE (subtype))))
3326 tree min_val = size_zero_node;
3328 sub = fold_indirect_ref_rhs (sub);
3330 sub = build1 (INDIRECT_REF, TREE_TYPE (subtype), osub);
3331 type_domain = TYPE_DOMAIN (TREE_TYPE (sub));
3332 if (type_domain && TYPE_MIN_VALUE (type_domain))
3333 min_val = TYPE_MIN_VALUE (type_domain);
3334 return build4 (ARRAY_REF, type, sub, min_val, NULL_TREE, NULL_TREE);
3340 /* Subroutine of gimplify_modify_expr to do simplifications of MODIFY_EXPRs
3341 based on the code of the RHS. We loop for as long as something changes. */
3343 static enum gimplify_status
3344 gimplify_modify_expr_rhs (tree *expr_p, tree *from_p, tree *to_p, tree *pre_p,
3345 tree *post_p, bool want_value)
3347 enum gimplify_status ret = GS_OK;
3349 while (ret != GS_UNHANDLED)
3350 switch (TREE_CODE (*from_p))
3354 /* If we have code like
3358 where the type of "x" is a (possibly cv-qualified variant
3359 of "A"), treat the entire expression as identical to "x".
3360 This kind of code arises in C++ when an object is bound
3361 to a const reference, and if "x" is a TARGET_EXPR we want
3362 to take advantage of the optimization below. */
3363 tree t = fold_indirect_ref_rhs (TREE_OPERAND (*from_p, 0));
3376 /* If we are initializing something from a TARGET_EXPR, strip the
3377 TARGET_EXPR and initialize it directly, if possible. This can't
3378 be done if the initializer is void, since that implies that the
3379 temporary is set in some non-trivial way.
3381 ??? What about code that pulls out the temp and uses it
3382 elsewhere? I think that such code never uses the TARGET_EXPR as
3383 an initializer. If I'm wrong, we'll die because the temp won't
3384 have any RTL. In that case, I guess we'll need to replace
3385 references somehow. */
3386 tree init = TARGET_EXPR_INITIAL (*from_p);
3388 if (!VOID_TYPE_P (TREE_TYPE (init)))
3399 /* Remove any COMPOUND_EXPR in the RHS so the following cases will be
3401 gimplify_compound_expr (from_p, pre_p, true);
3406 /* If we're initializing from a CONSTRUCTOR, break this into
3407 individual MODIFY_EXPRs. */
3408 return gimplify_init_constructor (expr_p, pre_p, post_p, want_value);
3411 /* If we're assigning to a non-register type, push the assignment
3412 down into the branches. This is mandatory for ADDRESSABLE types,
3413 since we cannot generate temporaries for such, but it saves a
3414 copy in other cases as well. */
3415 if (!is_gimple_reg_type (TREE_TYPE (*from_p)))
3417 /* This code should mirror the code in gimplify_cond_expr. */
3418 enum tree_code code = TREE_CODE (*expr_p);
3419 tree cond = *from_p;
3420 tree result = *to_p;
3422 ret = gimplify_expr (&result, pre_p, post_p,
3423 is_gimple_min_lval, fb_lvalue);
3424 if (ret != GS_ERROR)
3427 if (TREE_TYPE (TREE_OPERAND (cond, 1)) != void_type_node)
3428 TREE_OPERAND (cond, 1)
3429 = build2 (code, void_type_node, result,
3430 TREE_OPERAND (cond, 1));
3431 if (TREE_TYPE (TREE_OPERAND (cond, 2)) != void_type_node)
3432 TREE_OPERAND (cond, 2)
3433 = build2 (code, void_type_node, unshare_expr (result),
3434 TREE_OPERAND (cond, 2));
3436 TREE_TYPE (cond) = void_type_node;
3437 recalculate_side_effects (cond);
3441 gimplify_and_add (cond, pre_p);
3442 *expr_p = unshare_expr (result);
3453 /* For calls that return in memory, give *to_p as the CALL_EXPR's
3454 return slot so that we don't generate a temporary. */
3455 if (!CALL_EXPR_RETURN_SLOT_OPT (*from_p)
3456 && aggregate_value_p (*from_p, *from_p))
3460 if (!(rhs_predicate_for (*to_p))(*from_p))
3461 /* If we need a temporary, *to_p isn't accurate. */
3463 else if (TREE_CODE (*to_p) == RESULT_DECL
3464 && DECL_NAME (*to_p) == NULL_TREE
3465 && needs_to_live_in_memory (*to_p))
3466 /* It's OK to use the return slot directly unless it's an NRV. */
3468 else if (is_gimple_reg_type (TREE_TYPE (*to_p))
3469 || (DECL_P (*to_p) && DECL_REGISTER (*to_p)))
3470 /* Don't force regs into memory. */
3472 else if (TREE_CODE (*to_p) == VAR_DECL
3473 && DECL_GIMPLE_FORMAL_TEMP_P (*to_p))
3474 /* Don't use the original target if it's a formal temp; we
3475 don't want to take their addresses. */
3477 else if (TREE_CODE (*expr_p) == INIT_EXPR)
3478 /* It's OK to use the target directly if it's being
3481 else if (!is_gimple_non_addressable (*to_p))
3482 /* Don't use the original target if it's already addressable;
3483 if its address escapes, and the called function uses the
3484 NRV optimization, a conforming program could see *to_p
3485 change before the called function returns; see c++/19317.
3486 When optimizing, the return_slot pass marks more functions
3487 as safe after we have escape info. */
3494 CALL_EXPR_RETURN_SLOT_OPT (*from_p) = 1;
3495 mark_addressable (*to_p);
3502 /* If we're initializing from a container, push the initialization
3504 case CLEANUP_POINT_EXPR:
3506 case STATEMENT_LIST:
3508 tree wrap = *from_p;
3511 ret = gimplify_expr (to_p, pre_p, post_p,
3512 is_gimple_min_lval, fb_lvalue);
3513 if (ret != GS_ERROR)
3516 t = voidify_wrapper_expr (wrap, *expr_p);
3517 gcc_assert (t == *expr_p);
3521 gimplify_and_add (wrap, pre_p);
3522 *expr_p = unshare_expr (*to_p);
3537 /* Destructively convert the TREE pointer in TP into a gimple tuple if
3541 tree_to_gimple_tuple (tree *tp)
3544 switch (TREE_CODE (*tp))
3546 case GIMPLE_MODIFY_STMT:
3550 struct gimple_stmt *gs;
3551 tree lhs = TREE_OPERAND (*tp, 0);
3552 bool def_stmt_self_p = false;
3554 if (TREE_CODE (lhs) == SSA_NAME)
3556 if (SSA_NAME_DEF_STMT (lhs) == *tp)
3557 def_stmt_self_p = true;
3560 gs = &make_node (GIMPLE_MODIFY_STMT)->gstmt;
3561 gs->base = (*tp)->base;
3562 /* The set to base above overwrites the CODE. */
3563 TREE_SET_CODE ((tree) gs, GIMPLE_MODIFY_STMT);
3565 gs->locus = EXPR_LOCUS (*tp);
3566 gs->operands[0] = TREE_OPERAND (*tp, 0);
3567 gs->operands[1] = TREE_OPERAND (*tp, 1);
3568 gs->block = TREE_BLOCK (*tp);
3571 /* If we re-gimplify a set to an SSA_NAME, we must change the
3572 SSA name's DEF_STMT link. */
3573 if (def_stmt_self_p)
3574 SSA_NAME_DEF_STMT (GIMPLE_STMT_OPERAND (*tp, 0)) = *tp;
3583 /* Promote partial stores to COMPLEX variables to total stores. *EXPR_P is
3584 a MODIFY_EXPR with a lhs of a REAL/IMAGPART_EXPR of a variable with
3585 DECL_GIMPLE_REG_P set. */
3587 static enum gimplify_status
3588 gimplify_modify_expr_complex_part (tree *expr_p, tree *pre_p, bool want_value)
3590 enum tree_code code, ocode;
3591 tree lhs, rhs, new_rhs, other, realpart, imagpart;
3593 lhs = GENERIC_TREE_OPERAND (*expr_p, 0);
3594 rhs = GENERIC_TREE_OPERAND (*expr_p, 1);
3595 code = TREE_CODE (lhs);
3596 lhs = TREE_OPERAND (lhs, 0);
3598 ocode = code == REALPART_EXPR ? IMAGPART_EXPR : REALPART_EXPR;
3599 other = build1 (ocode, TREE_TYPE (rhs), lhs);
3600 other = get_formal_tmp_var (other, pre_p);
3602 realpart = code == REALPART_EXPR ? rhs : other;
3603 imagpart = code == REALPART_EXPR ? other : rhs;
3605 if (TREE_CONSTANT (realpart) && TREE_CONSTANT (imagpart))
3606 new_rhs = build_complex (TREE_TYPE (lhs), realpart, imagpart);
3608 new_rhs = build2 (COMPLEX_EXPR, TREE_TYPE (lhs), realpart, imagpart);
3610 GENERIC_TREE_OPERAND (*expr_p, 0) = lhs;
3611 GENERIC_TREE_OPERAND (*expr_p, 1) = new_rhs;
3615 tree_to_gimple_tuple (expr_p);
3617 append_to_statement_list (*expr_p, pre_p);
3624 /* Gimplify the MODIFY_EXPR node pointed to by EXPR_P.
3630 PRE_P points to the list where side effects that must happen before
3631 *EXPR_P should be stored.
3633 POST_P points to the list where side effects that must happen after
3634 *EXPR_P should be stored.
3636 WANT_VALUE is nonzero iff we want to use the value of this expression
3637 in another expression. */
3639 static enum gimplify_status
3640 gimplify_modify_expr (tree *expr_p, tree *pre_p, tree *post_p, bool want_value)
3642 tree *from_p = &GENERIC_TREE_OPERAND (*expr_p, 1);
3643 tree *to_p = &GENERIC_TREE_OPERAND (*expr_p, 0);
3644 enum gimplify_status ret = GS_UNHANDLED;
3646 gcc_assert (TREE_CODE (*expr_p) == MODIFY_EXPR
3647 || TREE_CODE (*expr_p) == GIMPLE_MODIFY_STMT
3648 || TREE_CODE (*expr_p) == INIT_EXPR);
3650 /* For zero sized types only gimplify the left hand side and right hand side
3651 as statements and throw away the assignment. */
3652 if (zero_sized_type (TREE_TYPE (*from_p)))
3654 gimplify_stmt (from_p);
3655 gimplify_stmt (to_p);
3656 append_to_statement_list (*from_p, pre_p);
3657 append_to_statement_list (*to_p, pre_p);
3658 *expr_p = NULL_TREE;
3662 /* See if any simplifications can be done based on what the RHS is. */
3663 ret = gimplify_modify_expr_rhs (expr_p, from_p, to_p, pre_p, post_p,
3665 if (ret != GS_UNHANDLED)
3668 /* If the value being copied is of variable width, compute the length
3669 of the copy into a WITH_SIZE_EXPR. Note that we need to do this
3670 before gimplifying any of the operands so that we can resolve any
3671 PLACEHOLDER_EXPRs in the size. Also note that the RTL expander uses
3672 the size of the expression to be copied, not of the destination, so
3673 that is what we must here. */
3674 maybe_with_size_expr (from_p);
3676 ret = gimplify_expr (to_p, pre_p, post_p, is_gimple_lvalue, fb_lvalue);
3677 if (ret == GS_ERROR)
3680 ret = gimplify_expr (from_p, pre_p, post_p,
3681 rhs_predicate_for (*to_p), fb_rvalue);
3682 if (ret == GS_ERROR)
3685 /* Now see if the above changed *from_p to something we handle specially. */
3686 ret = gimplify_modify_expr_rhs (expr_p, from_p, to_p, pre_p, post_p,
3688 if (ret != GS_UNHANDLED)
3691 /* If we've got a variable sized assignment between two lvalues (i.e. does
3692 not involve a call), then we can make things a bit more straightforward
3693 by converting the assignment to memcpy or memset. */
3694 if (TREE_CODE (*from_p) == WITH_SIZE_EXPR)
3696 tree from = TREE_OPERAND (*from_p, 0);
3697 tree size = TREE_OPERAND (*from_p, 1);
3699 if (TREE_CODE (from) == CONSTRUCTOR)
3700 return gimplify_modify_expr_to_memset (expr_p, size, want_value);
3701 if (is_gimple_addressable (from))
3704 return gimplify_modify_expr_to_memcpy (expr_p, size, want_value);
3708 /* Transform partial stores to non-addressable complex variables into
3709 total stores. This allows us to use real instead of virtual operands
3710 for these variables, which improves optimization. */
3711 if ((TREE_CODE (*to_p) == REALPART_EXPR
3712 || TREE_CODE (*to_p) == IMAGPART_EXPR)
3713 && is_gimple_reg (TREE_OPERAND (*to_p, 0)))
3714 return gimplify_modify_expr_complex_part (expr_p, pre_p, want_value);
3716 if (gimplify_ctxp->into_ssa && is_gimple_reg (*to_p))
3718 /* If we've somehow already got an SSA_NAME on the LHS, then
3719 we're probably modified it twice. Not good. */
3720 gcc_assert (TREE_CODE (*to_p) != SSA_NAME);
3721 *to_p = make_ssa_name (*to_p, *expr_p);
3724 /* Try to alleviate the effects of the gimplification creating artificial
3725 temporaries (see for example is_gimple_reg_rhs) on the debug info. */
3726 if (!gimplify_ctxp->into_ssa
3727 && DECL_P (*from_p) && DECL_IGNORED_P (*from_p)
3728 && DECL_P (*to_p) && !DECL_IGNORED_P (*to_p))
3730 if (!DECL_NAME (*from_p) && DECL_NAME (*to_p))
3732 = create_tmp_var_name (IDENTIFIER_POINTER (DECL_NAME (*to_p)));
3733 DECL_DEBUG_EXPR_IS_FROM (*from_p) = 1;
3734 SET_DECL_DEBUG_EXPR (*from_p, *to_p);
3739 tree_to_gimple_tuple (expr_p);
3741 append_to_statement_list (*expr_p, pre_p);
3749 /* Gimplify a comparison between two variable-sized objects. Do this
3750 with a call to BUILT_IN_MEMCMP. */
3752 static enum gimplify_status
3753 gimplify_variable_sized_compare (tree *expr_p)
3755 tree op0 = TREE_OPERAND (*expr_p, 0);
3756 tree op1 = TREE_OPERAND (*expr_p, 1);
3757 tree t, arg, dest, src;
3759 arg = TYPE_SIZE_UNIT (TREE_TYPE (op0));
3760 arg = unshare_expr (arg);
3761 arg = SUBSTITUTE_PLACEHOLDER_IN_EXPR (arg, op0);
3762 src = build_fold_addr_expr (op1);
3763 dest = build_fold_addr_expr (op0);
3764 t = implicit_built_in_decls[BUILT_IN_MEMCMP];
3765 t = build_call_expr (t, 3, dest, src, arg);
3767 = build2 (TREE_CODE (*expr_p), TREE_TYPE (*expr_p), t, integer_zero_node);
3772 /* Gimplify a comparison between two aggregate objects of integral scalar
3773 mode as a comparison between the bitwise equivalent scalar values. */
3775 static enum gimplify_status
3776 gimplify_scalar_mode_aggregate_compare (tree *expr_p)
3778 tree op0 = TREE_OPERAND (*expr_p, 0);
3779 tree op1 = TREE_OPERAND (*expr_p, 1);
3781 tree type = TREE_TYPE (op0);
3782 tree scalar_type = lang_hooks.types.type_for_mode (TYPE_MODE (type), 1);
3784 op0 = fold_build1 (VIEW_CONVERT_EXPR, scalar_type, op0);
3785 op1 = fold_build1 (VIEW_CONVERT_EXPR, scalar_type, op1);
3788 = fold_build2 (TREE_CODE (*expr_p), TREE_TYPE (*expr_p), op0, op1);
3793 /* Gimplify TRUTH_ANDIF_EXPR and TRUTH_ORIF_EXPR expressions. EXPR_P
3794 points to the expression to gimplify.
3796 Expressions of the form 'a && b' are gimplified to:
3798 a && b ? true : false
3800 gimplify_cond_expr will do the rest.
3802 PRE_P points to the list where side effects that must happen before
3803 *EXPR_P should be stored. */
3805 static enum gimplify_status
3806 gimplify_boolean_expr (tree *expr_p)
3808 /* Preserve the original type of the expression. */
3809 tree type = TREE_TYPE (*expr_p);
3811 *expr_p = build3 (COND_EXPR, type, *expr_p,
3812 fold_convert (type, boolean_true_node),
3813 fold_convert (type, boolean_false_node));
3818 /* Gimplifies an expression sequence. This function gimplifies each
3819 expression and re-writes the original expression with the last
3820 expression of the sequence in GIMPLE form.
3822 PRE_P points to the list where the side effects for all the
3823 expressions in the sequence will be emitted.
3825 WANT_VALUE is true when the result of the last COMPOUND_EXPR is used. */
3826 /* ??? Should rearrange to share the pre-queue with all the indirect
3827 invocations of gimplify_expr. Would probably save on creations
3828 of statement_list nodes. */
3830 static enum gimplify_status
3831 gimplify_compound_expr (tree *expr_p, tree *pre_p, bool want_value)
3837 tree *sub_p = &TREE_OPERAND (t, 0);
3839 if (TREE_CODE (*sub_p) == COMPOUND_EXPR)
3840 gimplify_compound_expr (sub_p, pre_p, false);
3842 gimplify_stmt (sub_p);
3843 append_to_statement_list (*sub_p, pre_p);
3845 t = TREE_OPERAND (t, 1);
3847 while (TREE_CODE (t) == COMPOUND_EXPR);
3854 gimplify_stmt (expr_p);
3859 /* Gimplifies a statement list. These may be created either by an
3860 enlightened front-end, or by shortcut_cond_expr. */
3862 static enum gimplify_status
3863 gimplify_statement_list (tree *expr_p, tree *pre_p)
3865 tree temp = voidify_wrapper_expr (*expr_p, NULL);
3867 tree_stmt_iterator i = tsi_start (*expr_p);
3869 while (!tsi_end_p (i))
3873 gimplify_stmt (tsi_stmt_ptr (i));
3878 else if (TREE_CODE (t) == STATEMENT_LIST)
3880 tsi_link_before (&i, t, TSI_SAME_STMT);
3889 append_to_statement_list (*expr_p, pre_p);
3897 /* Gimplify a SAVE_EXPR node. EXPR_P points to the expression to
3898 gimplify. After gimplification, EXPR_P will point to a new temporary
3899 that holds the original value of the SAVE_EXPR node.
3901 PRE_P points to the list where side effects that must happen before
3902 *EXPR_P should be stored. */
3904 static enum gimplify_status
3905 gimplify_save_expr (tree *expr_p, tree *pre_p, tree *post_p)
3907 enum gimplify_status ret = GS_ALL_DONE;
3910 gcc_assert (TREE_CODE (*expr_p) == SAVE_EXPR);
3911 val = TREE_OPERAND (*expr_p, 0);
3913 /* If the SAVE_EXPR has not been resolved, then evaluate it once. */
3914 if (!SAVE_EXPR_RESOLVED_P (*expr_p))
3916 /* The operand may be a void-valued expression such as SAVE_EXPRs
3917 generated by the Java frontend for class initialization. It is
3918 being executed only for its side-effects. */
3919 if (TREE_TYPE (val) == void_type_node)
3921 ret = gimplify_expr (&TREE_OPERAND (*expr_p, 0), pre_p, post_p,
3922 is_gimple_stmt, fb_none);
3923 append_to_statement_list (TREE_OPERAND (*expr_p, 0), pre_p);
3927 val = get_initialized_tmp_var (val, pre_p, post_p);
3929 TREE_OPERAND (*expr_p, 0) = val;
3930 SAVE_EXPR_RESOLVED_P (*expr_p) = 1;
3938 /* Re-write the ADDR_EXPR node pointed to by EXPR_P
3945 PRE_P points to the list where side effects that must happen before
3946 *EXPR_P should be stored.
3948 POST_P points to the list where side effects that must happen after
3949 *EXPR_P should be stored. */
3951 static enum gimplify_status
3952 gimplify_addr_expr (tree *expr_p, tree *pre_p, tree *post_p)
3954 tree expr = *expr_p;
3955 tree op0 = TREE_OPERAND (expr, 0);
3956 enum gimplify_status ret;
3958 switch (TREE_CODE (op0))
3961 case MISALIGNED_INDIRECT_REF:
3963 /* Check if we are dealing with an expression of the form '&*ptr'.
3964 While the front end folds away '&*ptr' into 'ptr', these
3965 expressions may be generated internally by the compiler (e.g.,
3966 builtins like __builtin_va_end). */
3967 /* Caution: the silent array decomposition semantics we allow for
3968 ADDR_EXPR means we can't always discard the pair. */
3969 /* Gimplification of the ADDR_EXPR operand may drop
3970 cv-qualification conversions, so make sure we add them if
3973 tree op00 = TREE_OPERAND (op0, 0);
3974 tree t_expr = TREE_TYPE (expr);
3975 tree t_op00 = TREE_TYPE (op00);
3977 if (!useless_type_conversion_p (t_expr, t_op00))
3979 #ifdef ENABLE_CHECKING
3980 tree t_op0 = TREE_TYPE (op0);
3981 gcc_assert (POINTER_TYPE_P (t_expr)
3982 && (cpt_same_type (TREE_TYPE (t_expr), t_op0)
3983 || (TREE_CODE (t_op0) == ARRAY_TYPE
3984 && cpt_same_type (TREE_TYPE (t_expr),
3985 TREE_TYPE (t_op0))))
3986 && POINTER_TYPE_P (t_op00)
3987 && cpt_same_type (t_op0, TREE_TYPE (t_op00)));
3989 op00 = fold_convert (TREE_TYPE (expr), op00);
3996 case VIEW_CONVERT_EXPR:
3997 /* Take the address of our operand and then convert it to the type of
4000 ??? The interactions of VIEW_CONVERT_EXPR and aliasing is not at
4001 all clear. The impact of this transformation is even less clear. */
4003 /* If the operand is a useless conversion, look through it. Doing so
4004 guarantees that the ADDR_EXPR and its operand will remain of the
4006 if (tree_ssa_useless_type_conversion (TREE_OPERAND (op0, 0)))
4007 op0 = TREE_OPERAND (op0, 0);
4009 *expr_p = fold_convert (TREE_TYPE (expr),
4010 build_fold_addr_expr (TREE_OPERAND (op0, 0)));
4015 /* We use fb_either here because the C frontend sometimes takes
4016 the address of a call that returns a struct; see
4017 gcc.dg/c99-array-lval-1.c. The gimplifier will correctly make
4018 the implied temporary explicit. */
4020 /* Mark the RHS addressable. */
4021 ret = gimplify_expr (&TREE_OPERAND (expr, 0), pre_p, post_p,
4022 is_gimple_addressable, fb_either);
4023 if (ret != GS_ERROR)
4025 op0 = TREE_OPERAND (expr, 0);
4027 /* For various reasons, the gimplification of the expression
4028 may have made a new INDIRECT_REF. */
4029 if (TREE_CODE (op0) == INDIRECT_REF)
4030 goto do_indirect_ref;
4032 /* Make sure TREE_INVARIANT, TREE_CONSTANT, and TREE_SIDE_EFFECTS
4034 recompute_tree_invariant_for_addr_expr (expr);
4036 mark_addressable (TREE_OPERAND (expr, 0));
4044 /* Gimplify the operands of an ASM_EXPR. Input operands should be a gimple
4045 value; output operands should be a gimple lvalue. */
4047 static enum gimplify_status
4048 gimplify_asm_expr (tree *expr_p, tree *pre_p, tree *post_p)
4050 tree expr = *expr_p;
4051 int noutputs = list_length (ASM_OUTPUTS (expr));
4052 const char **oconstraints
4053 = (const char **) alloca ((noutputs) * sizeof (const char *));
4056 const char *constraint;
4057 bool allows_mem, allows_reg, is_inout;
4058 enum gimplify_status ret, tret;
4061 for (i = 0, link = ASM_OUTPUTS (expr); link; ++i, link = TREE_CHAIN (link))
4063 size_t constraint_len;
4064 oconstraints[i] = constraint
4065 = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link)));
4066 constraint_len = strlen (constraint);
4067 if (constraint_len == 0)
4070 parse_output_constraint (&constraint, i, 0, 0,
4071 &allows_mem, &allows_reg, &is_inout);
4073 if (!allows_reg && allows_mem)
4074 mark_addressable (TREE_VALUE (link));
4076 tret = gimplify_expr (&TREE_VALUE (link), pre_p, post_p,
4077 is_inout ? is_gimple_min_lval : is_gimple_lvalue,
4078 fb_lvalue | fb_mayfail);
4079 if (tret == GS_ERROR)
4081 error ("invalid lvalue in asm output %d", i);
4087 /* An input/output operand. To give the optimizers more
4088 flexibility, split it into separate input and output
4093 /* Turn the in/out constraint into an output constraint. */
4094 char *p = xstrdup (constraint);
4096 TREE_VALUE (TREE_PURPOSE (link)) = build_string (constraint_len, p);
4098 /* And add a matching input constraint. */
4101 sprintf (buf, "%d", i);
4103 /* If there are multiple alternatives in the constraint,
4104 handle each of them individually. Those that allow register
4105 will be replaced with operand number, the others will stay
4107 if (strchr (p, ',') != NULL)
4109 size_t len = 0, buflen = strlen (buf);
4110 char *beg, *end, *str, *dst;
4114 end = strchr (beg, ',');
4116 end = strchr (beg, '\0');
4117 if ((size_t) (end - beg) < buflen)
4120 len += end - beg + 1;
4127 str = (char *) alloca (len);
4128 for (beg = p + 1, dst = str;;)
4131 bool mem_p, reg_p, inout_p;
4133 end = strchr (beg, ',');
4138 parse_output_constraint (&tem, i, 0, 0,
4139 &mem_p, ®_p, &inout_p);
4144 memcpy (dst, buf, buflen);
4153 memcpy (dst, beg, len);
4162 input = build_string (dst - str, str);
4165 input = build_string (strlen (buf), buf);
4168 input = build_string (constraint_len - 1, constraint + 1);
4172 input = build_tree_list (build_tree_list (NULL_TREE, input),
4173 unshare_expr (TREE_VALUE (link)));
4174 ASM_INPUTS (expr) = chainon (ASM_INPUTS (expr), input);
4178 for (link = ASM_INPUTS (expr); link; ++i, link = TREE_CHAIN (link))
4181 = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link)));
4182 parse_input_constraint (&constraint, 0, 0, noutputs, 0,
4183 oconstraints, &allows_mem, &allows_reg);
4185 /* If we can't make copies, we can only accept memory. */
4186 if (TREE_ADDRESSABLE (TREE_TYPE (TREE_VALUE (link))))
4192 error ("impossible constraint in %<asm%>");
4193 error ("non-memory input %d must stay in memory", i);
4198 /* If the operand is a memory input, it should be an lvalue. */
4199 if (!allows_reg && allows_mem)
4201 tret = gimplify_expr (&TREE_VALUE (link), pre_p, post_p,
4202 is_gimple_lvalue, fb_lvalue | fb_mayfail);
4203 mark_addressable (TREE_VALUE (link));
4204 if (tret == GS_ERROR)
4206 error ("memory input %d is not directly addressable", i);
4212 tret = gimplify_expr (&TREE_VALUE (link), pre_p, post_p,
4213 is_gimple_asm_val, fb_rvalue);
4214 if (tret == GS_ERROR)
4222 /* Gimplify a CLEANUP_POINT_EXPR. Currently this works by adding
4223 WITH_CLEANUP_EXPRs to the prequeue as we encounter cleanups while
4224 gimplifying the body, and converting them to TRY_FINALLY_EXPRs when we
4225 return to this function.
4227 FIXME should we complexify the prequeue handling instead? Or use flags
4228 for all the cleanups and let the optimizer tighten them up? The current
4229 code seems pretty fragile; it will break on a cleanup within any
4230 non-conditional nesting. But any such nesting would be broken, anyway;
4231 we can't write a TRY_FINALLY_EXPR that starts inside a nesting construct
4232 and continues out of it. We can do that at the RTL level, though, so
4233 having an optimizer to tighten up try/finally regions would be a Good
4236 static enum gimplify_status
4237 gimplify_cleanup_point_expr (tree *expr_p, tree *pre_p)
4239 tree_stmt_iterator iter;
4242 tree temp = voidify_wrapper_expr (*expr_p, NULL);
4244 /* We only care about the number of conditions between the innermost
4245 CLEANUP_POINT_EXPR and the cleanup. So save and reset the count and
4246 any cleanups collected outside the CLEANUP_POINT_EXPR. */
4247 int old_conds = gimplify_ctxp->conditions;
4248 tree old_cleanups = gimplify_ctxp->conditional_cleanups;
4249 gimplify_ctxp->conditions = 0;
4250 gimplify_ctxp->conditional_cleanups = NULL_TREE;
4252 body = TREE_OPERAND (*expr_p, 0);
4253 gimplify_to_stmt_list (&body);
4255 gimplify_ctxp->conditions = old_conds;
4256 gimplify_ctxp->conditional_cleanups = old_cleanups;
4258 for (iter = tsi_start (body); !tsi_end_p (iter); )
4260 tree *wce_p = tsi_stmt_ptr (iter);
4263 if (TREE_CODE (wce) == WITH_CLEANUP_EXPR)
4265 if (tsi_one_before_end_p (iter))
4267 tsi_link_before (&iter, TREE_OPERAND (wce, 0), TSI_SAME_STMT);
4274 enum tree_code code;
4276 if (CLEANUP_EH_ONLY (wce))
4277 code = TRY_CATCH_EXPR;
4279 code = TRY_FINALLY_EXPR;
4281 sl = tsi_split_statement_list_after (&iter);
4282 tfe = build2 (code, void_type_node, sl, NULL_TREE);
4283 append_to_statement_list (TREE_OPERAND (wce, 0),
4284 &TREE_OPERAND (tfe, 1));
4286 iter = tsi_start (sl);
4296 append_to_statement_list (body, pre_p);
4306 /* Insert a cleanup marker for gimplify_cleanup_point_expr. CLEANUP
4307 is the cleanup action required. */
4310 gimple_push_cleanup (tree var, tree cleanup, bool eh_only, tree *pre_p)
4314 /* Errors can result in improperly nested cleanups. Which results in
4315 confusion when trying to resolve the WITH_CLEANUP_EXPR. */
4316 if (errorcount || sorrycount)
4319 if (gimple_conditional_context ())
4321 /* If we're in a conditional context, this is more complex. We only
4322 want to run the cleanup if we actually ran the initialization that
4323 necessitates it, but we want to run it after the end of the
4324 conditional context. So we wrap the try/finally around the
4325 condition and use a flag to determine whether or not to actually
4326 run the destructor. Thus
4330 becomes (approximately)
4334 if (test) { A::A(temp); flag = 1; val = f(temp); }
4337 if (flag) A::~A(temp);
4342 tree flag = create_tmp_var (boolean_type_node, "cleanup");
4343 tree ffalse = build_gimple_modify_stmt (flag, boolean_false_node);
4344 tree ftrue = build_gimple_modify_stmt (flag, boolean_true_node);
4345 cleanup = build3 (COND_EXPR, void_type_node, flag, cleanup, NULL);
4346 wce = build1 (WITH_CLEANUP_EXPR, void_type_node, cleanup);
4347 append_to_statement_list (ffalse, &gimplify_ctxp->conditional_cleanups);
4348 append_to_statement_list (wce, &gimplify_ctxp->conditional_cleanups);
4349 append_to_statement_list (ftrue, pre_p);
4351 /* Because of this manipulation, and the EH edges that jump
4352 threading cannot redirect, the temporary (VAR) will appear
4353 to be used uninitialized. Don't warn. */
4354 TREE_NO_WARNING (var) = 1;
4358 wce = build1 (WITH_CLEANUP_EXPR, void_type_node, cleanup);
4359 CLEANUP_EH_ONLY (wce) = eh_only;
4360 append_to_statement_list (wce, pre_p);
4363 gimplify_stmt (&TREE_OPERAND (wce, 0));
4366 /* Gimplify a TARGET_EXPR which doesn't appear on the rhs of an INIT_EXPR. */
4368 static enum gimplify_status
4369 gimplify_target_expr (tree *expr_p, tree *pre_p, tree *post_p)
4371 tree targ = *expr_p;
4372 tree temp = TARGET_EXPR_SLOT (targ);
4373 tree init = TARGET_EXPR_INITIAL (targ);
4374 enum gimplify_status ret;
4378 /* TARGET_EXPR temps aren't part of the enclosing block, so add it
4379 to the temps list. */
4380 gimple_add_tmp_var (temp);
4382 /* If TARGET_EXPR_INITIAL is void, then the mere evaluation of the
4383 expression is supposed to initialize the slot. */
4384 if (VOID_TYPE_P (TREE_TYPE (init)))
4385 ret = gimplify_expr (&init, pre_p, post_p, is_gimple_stmt, fb_none);
4388 init = build2 (INIT_EXPR, void_type_node, temp, init);
4389 ret = gimplify_expr (&init, pre_p, post_p, is_gimple_stmt,
4392 if (ret == GS_ERROR)
4394 /* PR c++/28266 Make sure this is expanded only once. */
4395 TARGET_EXPR_INITIAL (targ) = NULL_TREE;
4398 append_to_statement_list (init, pre_p);
4400 /* If needed, push the cleanup for the temp. */
4401 if (TARGET_EXPR_CLEANUP (targ))
4403 gimplify_stmt (&TARGET_EXPR_CLEANUP (targ));
4404 gimple_push_cleanup (temp, TARGET_EXPR_CLEANUP (targ),
4405 CLEANUP_EH_ONLY (targ), pre_p);
4408 /* Only expand this once. */
4409 TREE_OPERAND (targ, 3) = init;
4410 TARGET_EXPR_INITIAL (targ) = NULL_TREE;
4413 /* We should have expanded this before. */
4414 gcc_assert (DECL_SEEN_IN_BIND_EXPR_P (temp));
4420 /* Gimplification of expression trees. */
4422 /* Gimplify an expression which appears at statement context; usually, this
4423 means replacing it with a suitably gimple STATEMENT_LIST. */
4426 gimplify_stmt (tree *stmt_p)
4428 gimplify_expr (stmt_p, NULL, NULL, is_gimple_stmt, fb_none);
4431 /* Similarly, but force the result to be a STATEMENT_LIST. */
4434 gimplify_to_stmt_list (tree *stmt_p)
4436 gimplify_stmt (stmt_p);
4438 *stmt_p = alloc_stmt_list ();
4439 else if (TREE_CODE (*stmt_p) != STATEMENT_LIST)
4442 *stmt_p = alloc_stmt_list ();
4443 append_to_statement_list (t, stmt_p);
4448 /* Add FIRSTPRIVATE entries for DECL in the OpenMP the surrounding parallels
4449 to CTX. If entries already exist, force them to be some flavor of private.
4450 If there is no enclosing parallel, do nothing. */
4453 omp_firstprivatize_variable (struct gimplify_omp_ctx *ctx, tree decl)
4457 if (decl == NULL || !DECL_P (decl))
4462 n = splay_tree_lookup (ctx->variables, (splay_tree_key)decl);
4465 if (n->value & GOVD_SHARED)
4466 n->value = GOVD_FIRSTPRIVATE | (n->value & GOVD_SEEN);
4470 else if (ctx->is_parallel)
4471 omp_add_variable (ctx, decl, GOVD_FIRSTPRIVATE);
4473 ctx = ctx->outer_context;
4478 /* Similarly for each of the type sizes of TYPE. */
4481 omp_firstprivatize_type_sizes (struct gimplify_omp_ctx *ctx, tree type)
4483 if (type == NULL || type == error_mark_node)
4485 type = TYPE_MAIN_VARIANT (type);
4487 if (pointer_set_insert (ctx->privatized_types, type))
4490 switch (TREE_CODE (type))
4496 omp_firstprivatize_variable (ctx, TYPE_MIN_VALUE (type));
4497 omp_firstprivatize_variable (ctx, TYPE_MAX_VALUE (type));
4501 omp_firstprivatize_type_sizes (ctx, TREE_TYPE (type));
4502 omp_firstprivatize_type_sizes (ctx, TYPE_DOMAIN (type));
4507 case QUAL_UNION_TYPE:
4510 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
4511 if (TREE_CODE (field) == FIELD_DECL)
4513 omp_firstprivatize_variable (ctx, DECL_FIELD_OFFSET (field));
4514 omp_firstprivatize_type_sizes (ctx, TREE_TYPE (field));
4520 case REFERENCE_TYPE:
4521 omp_firstprivatize_type_sizes (ctx, TREE_TYPE (type));
4528 omp_firstprivatize_variable (ctx, TYPE_SIZE (type));
4529 omp_firstprivatize_variable (ctx, TYPE_SIZE_UNIT (type));
4530 lang_hooks.types.omp_firstprivatize_type_sizes (ctx, type);
4533 /* Add an entry for DECL in the OpenMP context CTX with FLAGS. */
4536 omp_add_variable (struct gimplify_omp_ctx *ctx, tree decl, unsigned int flags)
4539 unsigned int nflags;
4542 if (decl == error_mark_node || TREE_TYPE (decl) == error_mark_node)
4545 /* Never elide decls whose type has TREE_ADDRESSABLE set. This means
4546 there are constructors involved somewhere. */
4547 if (TREE_ADDRESSABLE (TREE_TYPE (decl))
4548 || TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
4551 n = splay_tree_lookup (ctx->variables, (splay_tree_key)decl);
4554 /* We shouldn't be re-adding the decl with the same data
4556 gcc_assert ((n->value & GOVD_DATA_SHARE_CLASS & flags) == 0);
4557 /* The only combination of data sharing classes we should see is
4558 FIRSTPRIVATE and LASTPRIVATE. */
4559 nflags = n->value | flags;
4560 gcc_assert ((nflags & GOVD_DATA_SHARE_CLASS)
4561 == (GOVD_FIRSTPRIVATE | GOVD_LASTPRIVATE));
4566 /* When adding a variable-sized variable, we have to handle all sorts
4567 of additional bits of data: the pointer replacement variable, and
4568 the parameters of the type. */
4569 if (DECL_SIZE (decl) && TREE_CODE (DECL_SIZE (decl)) != INTEGER_CST)
4571 /* Add the pointer replacement variable as PRIVATE if the variable
4572 replacement is private, else FIRSTPRIVATE since we'll need the
4573 address of the original variable either for SHARED, or for the
4574 copy into or out of the context. */
4575 if (!(flags & GOVD_LOCAL))
4577 nflags = flags & GOVD_PRIVATE ? GOVD_PRIVATE : GOVD_FIRSTPRIVATE;
4578 nflags |= flags & GOVD_SEEN;
4579 t = DECL_VALUE_EXPR (decl);
4580 gcc_assert (TREE_CODE (t) == INDIRECT_REF);
4581 t = TREE_OPERAND (t, 0);
4582 gcc_assert (DECL_P (t));
4583 omp_add_variable (ctx, t, nflags);
4586 /* Add all of the variable and type parameters (which should have
4587 been gimplified to a formal temporary) as FIRSTPRIVATE. */
4588 omp_firstprivatize_variable (ctx, DECL_SIZE_UNIT (decl));
4589 omp_firstprivatize_variable (ctx, DECL_SIZE (decl));
4590 omp_firstprivatize_type_sizes (ctx, TREE_TYPE (decl));
4592 /* The variable-sized variable itself is never SHARED, only some form
4593 of PRIVATE. The sharing would take place via the pointer variable
4594 which we remapped above. */
4595 if (flags & GOVD_SHARED)
4596 flags = GOVD_PRIVATE | GOVD_DEBUG_PRIVATE
4597 | (flags & (GOVD_SEEN | GOVD_EXPLICIT));
4599 /* We're going to make use of the TYPE_SIZE_UNIT at least in the
4600 alloca statement we generate for the variable, so make sure it
4601 is available. This isn't automatically needed for the SHARED
4602 case, since we won't be allocating local storage then.
4603 For local variables TYPE_SIZE_UNIT might not be gimplified yet,
4604 in this case omp_notice_variable will be called later
4605 on when it is gimplified. */
4606 else if (! (flags & GOVD_LOCAL))
4607 omp_notice_variable (ctx, TYPE_SIZE_UNIT (TREE_TYPE (decl)), true);
4609 else if (lang_hooks.decls.omp_privatize_by_reference (decl))
4611 gcc_assert ((flags & GOVD_LOCAL) == 0);
4612 omp_firstprivatize_type_sizes (ctx, TREE_TYPE (decl));
4614 /* Similar to the direct variable sized case above, we'll need the
4615 size of references being privatized. */
4616 if ((flags & GOVD_SHARED) == 0)
4618 t = TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (decl)));
4619 if (TREE_CODE (t) != INTEGER_CST)
4620 omp_notice_variable (ctx, t, true);
4624 splay_tree_insert (ctx->variables, (splay_tree_key)decl, flags);
4627 /* Record the fact that DECL was used within the OpenMP context CTX.
4628 IN_CODE is true when real code uses DECL, and false when we should
4629 merely emit default(none) errors. Return true if DECL is going to
4630 be remapped and thus DECL shouldn't be gimplified into its
4631 DECL_VALUE_EXPR (if any). */
4634 omp_notice_variable (struct gimplify_omp_ctx *ctx, tree decl, bool in_code)
4637 unsigned flags = in_code ? GOVD_SEEN : 0;
4638 bool ret = false, shared;
4640 if (decl == error_mark_node || TREE_TYPE (decl) == error_mark_node)
4643 /* Threadprivate variables are predetermined. */
4644 if (is_global_var (decl))
4646 if (DECL_THREAD_LOCAL_P (decl))
4649 if (DECL_HAS_VALUE_EXPR_P (decl))
4651 tree value = get_base_address (DECL_VALUE_EXPR (decl));
4653 if (value && DECL_P (value) && DECL_THREAD_LOCAL_P (value))
4658 n = splay_tree_lookup (ctx->variables, (splay_tree_key)decl);
4661 enum omp_clause_default_kind default_kind, kind;
4663 if (!ctx->is_parallel)
4666 /* ??? Some compiler-generated variables (like SAVE_EXPRs) could be
4667 remapped firstprivate instead of shared. To some extent this is
4668 addressed in omp_firstprivatize_type_sizes, but not effectively. */
4669 default_kind = ctx->default_kind;
4670 kind = lang_hooks.decls.omp_predetermined_sharing (decl);
4671 if (kind != OMP_CLAUSE_DEFAULT_UNSPECIFIED)
4672 default_kind = kind;
4674 switch (default_kind)
4676 case OMP_CLAUSE_DEFAULT_NONE:
4677 error ("%qs not specified in enclosing parallel",
4678 IDENTIFIER_POINTER (DECL_NAME (decl)));
4679 error ("%Henclosing parallel", &ctx->location);
4681 case OMP_CLAUSE_DEFAULT_SHARED:
4682 flags |= GOVD_SHARED;
4684 case OMP_CLAUSE_DEFAULT_PRIVATE:
4685 flags |= GOVD_PRIVATE;
4691 omp_add_variable (ctx, decl, flags);
4693 shared = (flags & GOVD_SHARED) != 0;
4694 ret = lang_hooks.decls.omp_disregard_value_expr (decl, shared);
4698 shared = ((flags | n->value) & GOVD_SHARED) != 0;
4699 ret = lang_hooks.decls.omp_disregard_value_expr (decl, shared);
4701 /* If nothing changed, there's nothing left to do. */
4702 if ((n->value & flags) == flags)
4708 /* If the variable is private in the current context, then we don't
4709 need to propagate anything to an outer context. */
4710 if (flags & GOVD_PRIVATE)
4712 if (ctx->outer_context
4713 && omp_notice_variable (ctx->outer_context, decl, in_code))
4718 /* Verify that DECL is private within CTX. If there's specific information
4719 to the contrary in the innermost scope, generate an error. */
4722 omp_is_private (struct gimplify_omp_ctx *ctx, tree decl)
4726 n = splay_tree_lookup (ctx->variables, (splay_tree_key)decl);
4729 if (n->value & GOVD_SHARED)
4731 if (ctx == gimplify_omp_ctxp)
4733 error ("iteration variable %qs should be private",
4734 IDENTIFIER_POINTER (DECL_NAME (decl)));
4735 n->value = GOVD_PRIVATE;
4741 else if ((n->value & GOVD_EXPLICIT) != 0
4742 && (ctx == gimplify_omp_ctxp
4743 || (ctx->is_combined_parallel
4744 && gimplify_omp_ctxp->outer_context == ctx)))
4746 if ((n->value & GOVD_FIRSTPRIVATE) != 0)
4747 error ("iteration variable %qs should not be firstprivate",
4748 IDENTIFIER_POINTER (DECL_NAME (decl)));
4749 else if ((n->value & GOVD_REDUCTION) != 0)
4750 error ("iteration variable %qs should not be reduction",
4751 IDENTIFIER_POINTER (DECL_NAME (decl)));
4756 if (ctx->is_parallel)
4758 else if (ctx->outer_context)
4759 return omp_is_private (ctx->outer_context, decl);
4761 return !is_global_var (decl);
4764 /* Return true if DECL is private within a parallel region
4765 that binds to the current construct's context or in parallel
4766 region's REDUCTION clause. */
4769 omp_check_private (struct gimplify_omp_ctx *ctx, tree decl)
4775 ctx = ctx->outer_context;
4777 return !(is_global_var (decl)
4778 /* References might be private, but might be shared too. */
4779 || lang_hooks.decls.omp_privatize_by_reference (decl));
4781 n = splay_tree_lookup (ctx->variables, (splay_tree_key) decl);
4783 return (n->value & GOVD_SHARED) == 0;
4785 while (!ctx->is_parallel);
4789 /* Scan the OpenMP clauses in *LIST_P, installing mappings into a new
4790 and previous omp contexts. */
4793 gimplify_scan_omp_clauses (tree *list_p, tree *pre_p, bool in_parallel,
4794 bool in_combined_parallel)
4796 struct gimplify_omp_ctx *ctx, *outer_ctx;
4799 ctx = new_omp_context (in_parallel, in_combined_parallel);
4800 outer_ctx = ctx->outer_context;
4802 while ((c = *list_p) != NULL)
4804 enum gimplify_status gs;
4805 bool remove = false;
4806 bool notice_outer = true;
4807 const char *check_non_private = NULL;
4811 switch (OMP_CLAUSE_CODE (c))
4813 case OMP_CLAUSE_PRIVATE:
4814 flags = GOVD_PRIVATE | GOVD_EXPLICIT;
4815 notice_outer = false;
4817 case OMP_CLAUSE_SHARED:
4818 flags = GOVD_SHARED | GOVD_EXPLICIT;
4820 case OMP_CLAUSE_FIRSTPRIVATE:
4821 flags = GOVD_FIRSTPRIVATE | GOVD_EXPLICIT;
4822 check_non_private = "firstprivate";
4824 case OMP_CLAUSE_LASTPRIVATE:
4825 flags = GOVD_LASTPRIVATE | GOVD_SEEN | GOVD_EXPLICIT;
4826 check_non_private = "lastprivate";
4828 case OMP_CLAUSE_REDUCTION:
4829 flags = GOVD_REDUCTION | GOVD_SEEN | GOVD_EXPLICIT;
4830 check_non_private = "reduction";
4834 decl = OMP_CLAUSE_DECL (c);
4835 if (decl == error_mark_node || TREE_TYPE (decl) == error_mark_node)
4840 omp_add_variable (ctx, decl, flags);
4841 if (OMP_CLAUSE_CODE (c) == OMP_CLAUSE_REDUCTION
4842 && OMP_CLAUSE_REDUCTION_PLACEHOLDER (c))
4844 omp_add_variable (ctx, OMP_CLAUSE_REDUCTION_PLACEHOLDER (c),
4845 GOVD_LOCAL | GOVD_SEEN);
4846 gimplify_omp_ctxp = ctx;
4847 push_gimplify_context ();
4848 gimplify_stmt (&OMP_CLAUSE_REDUCTION_INIT (c));
4849 pop_gimplify_context (OMP_CLAUSE_REDUCTION_INIT (c));
4850 push_gimplify_context ();
4851 gimplify_stmt (&OMP_CLAUSE_REDUCTION_MERGE (c));
4852 pop_gimplify_context (OMP_CLAUSE_REDUCTION_MERGE (c));
4853 gimplify_omp_ctxp = outer_ctx;
4859 case OMP_CLAUSE_COPYIN:
4860 case OMP_CLAUSE_COPYPRIVATE:
4861 decl = OMP_CLAUSE_DECL (c);
4862 if (decl == error_mark_node || TREE_TYPE (decl) == error_mark_node)
4869 omp_notice_variable (outer_ctx, decl, true);
4870 if (check_non_private
4872 && omp_check_private (ctx, decl))
4874 error ("%s variable %qs is private in outer context",
4875 check_non_private, IDENTIFIER_POINTER (DECL_NAME (decl)));
4881 OMP_CLAUSE_OPERAND (c, 0)
4882 = gimple_boolify (OMP_CLAUSE_OPERAND (c, 0));
4885 case OMP_CLAUSE_SCHEDULE:
4886 case OMP_CLAUSE_NUM_THREADS:
4887 gs = gimplify_expr (&OMP_CLAUSE_OPERAND (c, 0), pre_p, NULL,
4888 is_gimple_val, fb_rvalue);
4893 case OMP_CLAUSE_NOWAIT:
4894 case OMP_CLAUSE_ORDERED:
4897 case OMP_CLAUSE_DEFAULT:
4898 ctx->default_kind = OMP_CLAUSE_DEFAULT_KIND (c);
4906 *list_p = OMP_CLAUSE_CHAIN (c);
4908 list_p = &OMP_CLAUSE_CHAIN (c);
4911 gimplify_omp_ctxp = ctx;
4914 /* For all variables that were not actually used within the context,
4915 remove PRIVATE, SHARED, and FIRSTPRIVATE clauses. */
4918 gimplify_adjust_omp_clauses_1 (splay_tree_node n, void *data)
4920 tree *list_p = (tree *) data;
4921 tree decl = (tree) n->key;
4922 unsigned flags = n->value;
4923 enum omp_clause_code code;
4927 if (flags & (GOVD_EXPLICIT | GOVD_LOCAL))
4929 if ((flags & GOVD_SEEN) == 0)
4931 if (flags & GOVD_DEBUG_PRIVATE)
4933 gcc_assert ((flags & GOVD_DATA_SHARE_CLASS) == GOVD_PRIVATE);
4934 private_debug = true;
4938 = lang_hooks.decls.omp_private_debug_clause (decl,
4939 !!(flags & GOVD_SHARED));
4941 code = OMP_CLAUSE_PRIVATE;
4942 else if (flags & GOVD_SHARED)
4944 if (is_global_var (decl))
4946 struct gimplify_omp_ctx *ctx = gimplify_omp_ctxp->outer_context;
4950 = splay_tree_lookup (ctx->variables, (splay_tree_key) decl);
4951 if (on && (on->value & (GOVD_FIRSTPRIVATE | GOVD_LASTPRIVATE
4952 | GOVD_PRIVATE | GOVD_REDUCTION)) != 0)
4954 ctx = ctx->outer_context;
4959 code = OMP_CLAUSE_SHARED;
4961 else if (flags & GOVD_PRIVATE)
4962 code = OMP_CLAUSE_PRIVATE;
4963 else if (flags & GOVD_FIRSTPRIVATE)
4964 code = OMP_CLAUSE_FIRSTPRIVATE;
4968 clause = build_omp_clause (code);
4969 OMP_CLAUSE_DECL (clause) = decl;
4970 OMP_CLAUSE_CHAIN (clause) = *list_p;
4972 OMP_CLAUSE_PRIVATE_DEBUG (clause) = 1;
4979 gimplify_adjust_omp_clauses (tree *list_p)
4981 struct gimplify_omp_ctx *ctx = gimplify_omp_ctxp;
4984 while ((c = *list_p) != NULL)
4987 bool remove = false;
4989 switch (OMP_CLAUSE_CODE (c))
4991 case OMP_CLAUSE_PRIVATE:
4992 case OMP_CLAUSE_SHARED:
4993 case OMP_CLAUSE_FIRSTPRIVATE:
4994 decl = OMP_CLAUSE_DECL (c);
4995 n = splay_tree_lookup (ctx->variables, (splay_tree_key) decl);
4996 remove = !(n->value & GOVD_SEEN);
4999 bool shared = OMP_CLAUSE_CODE (c) == OMP_CLAUSE_SHARED;
5000 if ((n->value & GOVD_DEBUG_PRIVATE)
5001 || lang_hooks.decls.omp_private_debug_clause (decl, shared))
5003 gcc_assert ((n->value & GOVD_DEBUG_PRIVATE) == 0
5004 || ((n->value & GOVD_DATA_SHARE_CLASS)
5006 OMP_CLAUSE_SET_CODE (c, OMP_CLAUSE_PRIVATE);
5007 OMP_CLAUSE_PRIVATE_DEBUG (c) = 1;
5012 case OMP_CLAUSE_LASTPRIVATE:
5013 /* Make sure OMP_CLAUSE_LASTPRIVATE_FIRSTPRIVATE is set to
5014 accurately reflect the presence of a FIRSTPRIVATE clause. */
5015 decl = OMP_CLAUSE_DECL (c);
5016 n = splay_tree_lookup (ctx->variables, (splay_tree_key) decl);
5017 OMP_CLAUSE_LASTPRIVATE_FIRSTPRIVATE (c)
5018 = (n->value & GOVD_FIRSTPRIVATE) != 0;
5021 case OMP_CLAUSE_REDUCTION:
5022 case OMP_CLAUSE_COPYIN:
5023 case OMP_CLAUSE_COPYPRIVATE:
5025 case OMP_CLAUSE_NUM_THREADS:
5026 case OMP_CLAUSE_SCHEDULE:
5027 case OMP_CLAUSE_NOWAIT:
5028 case OMP_CLAUSE_ORDERED:
5029 case OMP_CLAUSE_DEFAULT:
5037 *list_p = OMP_CLAUSE_CHAIN (c);
5039 list_p = &OMP_CLAUSE_CHAIN (c);
5042 /* Add in any implicit data sharing. */
5043 splay_tree_foreach (ctx->variables, gimplify_adjust_omp_clauses_1, list_p);
5045 gimplify_omp_ctxp = ctx->outer_context;
5046 delete_omp_context (ctx);
5049 /* Gimplify the contents of an OMP_PARALLEL statement. This involves
5050 gimplification of the body, as well as scanning the body for used
5051 variables. We need to do this scan now, because variable-sized
5052 decls will be decomposed during gimplification. */
5054 static enum gimplify_status
5055 gimplify_omp_parallel (tree *expr_p, tree *pre_p)
5057 tree expr = *expr_p;
5059 gimplify_scan_omp_clauses (&OMP_PARALLEL_CLAUSES (expr), pre_p, true,
5060 OMP_PARALLEL_COMBINED (expr));
5062 push_gimplify_context ();
5064 gimplify_stmt (&OMP_PARALLEL_BODY (expr));
5066 if (TREE_CODE (OMP_PARALLEL_BODY (expr)) == BIND_EXPR)
5067 pop_gimplify_context (OMP_PARALLEL_BODY (expr));
5069 pop_gimplify_context (NULL_TREE);
5071 gimplify_adjust_omp_clauses (&OMP_PARALLEL_CLAUSES (expr));
5076 /* Gimplify the gross structure of an OMP_FOR statement. */
5078 static enum gimplify_status
5079 gimplify_omp_for (tree *expr_p, tree *pre_p)
5081 tree for_stmt, decl, t;
5082 enum gimplify_status ret = GS_OK;
5086 gimplify_scan_omp_clauses (&OMP_FOR_CLAUSES (for_stmt), pre_p, false, false);
5088 t = OMP_FOR_INIT (for_stmt);
5089 gcc_assert (TREE_CODE (t) == MODIFY_EXPR
5090 || TREE_CODE (t) == GIMPLE_MODIFY_STMT);
5091 decl = GENERIC_TREE_OPERAND (t, 0);
5092 gcc_assert (DECL_P (decl));
5093 gcc_assert (INTEGRAL_TYPE_P (TREE_TYPE (decl)));
5095 /* Make sure the iteration variable is private. */
5096 if (omp_is_private (gimplify_omp_ctxp, decl))
5097 omp_notice_variable (gimplify_omp_ctxp, decl, true);
5099 omp_add_variable (gimplify_omp_ctxp, decl, GOVD_PRIVATE | GOVD_SEEN);
5101 ret |= gimplify_expr (&GENERIC_TREE_OPERAND (t, 1),
5102 &OMP_FOR_PRE_BODY (for_stmt),
5103 NULL, is_gimple_val, fb_rvalue);
5105 tree_to_gimple_tuple (&OMP_FOR_INIT (for_stmt));
5107 t = OMP_FOR_COND (for_stmt);
5108 gcc_assert (COMPARISON_CLASS_P (t));
5109 gcc_assert (GENERIC_TREE_OPERAND (t, 0) == decl);
5111 ret |= gimplify_expr (&GENERIC_TREE_OPERAND (t, 1),
5112 &OMP_FOR_PRE_BODY (for_stmt),
5113 NULL, is_gimple_val, fb_rvalue);
5115 tree_to_gimple_tuple (&OMP_FOR_INCR (for_stmt));
5116 t = OMP_FOR_INCR (for_stmt);
5117 switch (TREE_CODE (t))
5119 case PREINCREMENT_EXPR:
5120 case POSTINCREMENT_EXPR:
5121 t = build_int_cst (TREE_TYPE (decl), 1);
5122 t = build2 (PLUS_EXPR, TREE_TYPE (decl), decl, t);
5123 t = build_gimple_modify_stmt (decl, t);
5124 OMP_FOR_INCR (for_stmt) = t;
5127 case PREDECREMENT_EXPR:
5128 case POSTDECREMENT_EXPR:
5129 t = build_int_cst (TREE_TYPE (decl), -1);
5130 t = build2 (PLUS_EXPR, TREE_TYPE (decl), decl, t);
5131 t = build_gimple_modify_stmt (decl, t);
5132 OMP_FOR_INCR (for_stmt) = t;
5135 case GIMPLE_MODIFY_STMT:
5136 gcc_assert (GIMPLE_STMT_OPERAND (t, 0) == decl);
5137 t = GIMPLE_STMT_OPERAND (t, 1);
5138 switch (TREE_CODE (t))
5141 if (TREE_OPERAND (t, 1) == decl)
5143 TREE_OPERAND (t, 1) = TREE_OPERAND (t, 0);
5144 TREE_OPERAND (t, 0) = decl;
5148 gcc_assert (TREE_OPERAND (t, 0) == decl);
5154 ret |= gimplify_expr (&TREE_OPERAND (t, 1), &OMP_FOR_PRE_BODY (for_stmt),
5155 NULL, is_gimple_val, fb_rvalue);
5162 gimplify_to_stmt_list (&OMP_FOR_BODY (for_stmt));
5163 gimplify_adjust_omp_clauses (&OMP_FOR_CLAUSES (for_stmt));
5165 return ret == GS_ALL_DONE ? GS_ALL_DONE : GS_ERROR;
5168 /* Gimplify the gross structure of other OpenMP worksharing constructs.
5169 In particular, OMP_SECTIONS and OMP_SINGLE. */
5171 static enum gimplify_status
5172 gimplify_omp_workshare (tree *expr_p, tree *pre_p)
5174 tree stmt = *expr_p;
5176 gimplify_scan_omp_clauses (&OMP_CLAUSES (stmt), pre_p, false, false);
5177 gimplify_to_stmt_list (&OMP_BODY (stmt));
5178 gimplify_adjust_omp_clauses (&OMP_CLAUSES (stmt));
5183 /* A subroutine of gimplify_omp_atomic. The front end is supposed to have
5184 stabilized the lhs of the atomic operation as *ADDR. Return true if
5185 EXPR is this stabilized form. */
5188 goa_lhs_expr_p (tree expr, tree addr)
5190 /* Also include casts to other type variants. The C front end is fond
5191 of adding these for e.g. volatile variables. This is like
5192 STRIP_TYPE_NOPS but includes the main variant lookup. */
5193 while ((TREE_CODE (expr) == NOP_EXPR
5194 || TREE_CODE (expr) == CONVERT_EXPR
5195 || TREE_CODE (expr) == NON_LVALUE_EXPR)
5196 && TREE_OPERAND (expr, 0) != error_mark_node
5197 && (TYPE_MAIN_VARIANT (TREE_TYPE (expr))
5198 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_OPERAND (expr, 0)))))
5199 expr = TREE_OPERAND (expr, 0);
5201 if (TREE_CODE (expr) == INDIRECT_REF && TREE_OPERAND (expr, 0) == addr)
5203 if (TREE_CODE (addr) == ADDR_EXPR && expr == TREE_OPERAND (addr, 0))
5208 /* A subroutine of gimplify_omp_atomic. Attempt to implement the atomic
5209 operation as a __sync_fetch_and_op builtin. INDEX is log2 of the
5210 size of the data type, and thus usable to find the index of the builtin
5211 decl. Returns GS_UNHANDLED if the expression is not of the proper form. */
5213 static enum gimplify_status
5214 gimplify_omp_atomic_fetch_op (tree *expr_p, tree addr, tree rhs, int index)
5216 enum built_in_function base;
5218 enum insn_code *optab;
5220 /* Check for one of the supported fetch-op operations. */
5221 switch (TREE_CODE (rhs))
5223 case POINTER_PLUS_EXPR:
5225 base = BUILT_IN_FETCH_AND_ADD_N;
5226 optab = sync_add_optab;
5229 base = BUILT_IN_FETCH_AND_SUB_N;
5230 optab = sync_add_optab;
5233 base = BUILT_IN_FETCH_AND_AND_N;
5234 optab = sync_and_optab;
5237 base = BUILT_IN_FETCH_AND_OR_N;
5238 optab = sync_ior_optab;
5241 base = BUILT_IN_FETCH_AND_XOR_N;
5242 optab = sync_xor_optab;
5245 return GS_UNHANDLED;
5248 /* Make sure the expression is of the proper form. */
5249 if (goa_lhs_expr_p (TREE_OPERAND (rhs, 0), addr))
5250 rhs = TREE_OPERAND (rhs, 1);
5251 else if (commutative_tree_code (TREE_CODE (rhs))
5252 && goa_lhs_expr_p (TREE_OPERAND (rhs, 1), addr))
5253 rhs = TREE_OPERAND (rhs, 0);
5255 return GS_UNHANDLED;
5257 decl = built_in_decls[base + index + 1];
5258 itype = TREE_TYPE (TREE_TYPE (decl));
5260 if (optab[TYPE_MODE (itype)] == CODE_FOR_nothing)
5261 return GS_UNHANDLED;
5263 *expr_p = build_call_expr (decl, 2, addr, fold_convert (itype, rhs));
5267 /* A subroutine of gimplify_omp_atomic_pipeline. Walk *EXPR_P and replace
5268 appearances of *LHS_ADDR with LHS_VAR. If an expression does not involve
5269 the lhs, evaluate it into a temporary. Return 1 if the lhs appeared as
5270 a subexpression, 0 if it did not, or -1 if an error was encountered. */
5273 goa_stabilize_expr (tree *expr_p, tree *pre_p, tree lhs_addr, tree lhs_var)
5275 tree expr = *expr_p;
5278 if (goa_lhs_expr_p (expr, lhs_addr))
5283 if (is_gimple_val (expr))
5287 switch (TREE_CODE_CLASS (TREE_CODE (expr)))
5290 saw_lhs |= goa_stabilize_expr (&TREE_OPERAND (expr, 1), pre_p,
5293 saw_lhs |= goa_stabilize_expr (&TREE_OPERAND (expr, 0), pre_p,
5302 enum gimplify_status gs;
5303 gs = gimplify_expr (expr_p, pre_p, NULL, is_gimple_val, fb_rvalue);
5304 if (gs != GS_ALL_DONE)
5311 /* A subroutine of gimplify_omp_atomic. Implement the atomic operation as:
5315 newval = rhs; // with oldval replacing *addr in rhs
5316 oldval = __sync_val_compare_and_swap (addr, oldval, newval);
5317 if (oldval != newval)
5320 INDEX is log2 of the size of the data type, and thus usable to find the
5321 index of the builtin decl. */
5323 static enum gimplify_status
5324 gimplify_omp_atomic_pipeline (tree *expr_p, tree *pre_p, tree addr,
5325 tree rhs, int index)
5327 tree oldval, oldival, oldival2, newval, newival, label;
5328 tree type, itype, cmpxchg, x, iaddr;
5330 cmpxchg = built_in_decls[BUILT_IN_VAL_COMPARE_AND_SWAP_N + index + 1];
5331 type = TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (addr)));
5332 itype = TREE_TYPE (TREE_TYPE (cmpxchg));
5334 if (sync_compare_and_swap[TYPE_MODE (itype)] == CODE_FOR_nothing)
5335 return GS_UNHANDLED;
5337 oldval = create_tmp_var (type, NULL);
5338 newval = create_tmp_var (type, NULL);
5340 /* Precompute as much of RHS as possible. In the same walk, replace
5341 occurrences of the lhs value with our temporary. */
5342 if (goa_stabilize_expr (&rhs, pre_p, addr, oldval) < 0)
5345 x = build_fold_indirect_ref (addr);
5346 x = build_gimple_modify_stmt (oldval, x);
5347 gimplify_and_add (x, pre_p);
5349 /* For floating-point values, we'll need to view-convert them to integers
5350 so that we can perform the atomic compare and swap. Simplify the
5351 following code by always setting up the "i"ntegral variables. */
5352 if (INTEGRAL_TYPE_P (type) || POINTER_TYPE_P (type))
5360 oldival = create_tmp_var (itype, NULL);
5361 newival = create_tmp_var (itype, NULL);
5363 x = build1 (VIEW_CONVERT_EXPR, itype, oldval);
5364 x = build_gimple_modify_stmt (oldival, x);
5365 gimplify_and_add (x, pre_p);
5366 iaddr = fold_convert (build_pointer_type (itype), addr);
5369 oldival2 = create_tmp_var (itype, NULL);
5371 label = create_artificial_label ();
5372 x = build1 (LABEL_EXPR, void_type_node, label);
5373 gimplify_and_add (x, pre_p);
5375 x = build_gimple_modify_stmt (newval, rhs);
5376 gimplify_and_add (x, pre_p);
5378 if (newval != newival)
5380 x = build1 (VIEW_CONVERT_EXPR, itype, newval);
5381 x = build_gimple_modify_stmt (newival, x);
5382 gimplify_and_add (x, pre_p);
5385 x = build_gimple_modify_stmt (oldival2, fold_convert (itype, oldival));
5386 gimplify_and_add (x, pre_p);
5388 x = build_call_expr (cmpxchg, 3, iaddr, fold_convert (itype, oldival),
5389 fold_convert (itype, newival));
5390 if (oldval == oldival)
5391 x = fold_convert (type, x);
5392 x = build_gimple_modify_stmt (oldival, x);
5393 gimplify_and_add (x, pre_p);
5395 /* For floating point, be prepared for the loop backedge. */
5396 if (oldval != oldival)
5398 x = build1 (VIEW_CONVERT_EXPR, type, oldival);
5399 x = build_gimple_modify_stmt (oldval, x);
5400 gimplify_and_add (x, pre_p);
5403 /* Note that we always perform the comparison as an integer, even for
5404 floating point. This allows the atomic operation to properly
5405 succeed even with NaNs and -0.0. */
5406 x = build3 (COND_EXPR, void_type_node,
5407 build2 (NE_EXPR, boolean_type_node,
5408 fold_convert (itype, oldival), oldival2),
5409 build1 (GOTO_EXPR, void_type_node, label), NULL);
5410 gimplify_and_add (x, pre_p);
5416 /* A subroutine of gimplify_omp_atomic. Implement the atomic operation as:
5418 GOMP_atomic_start ();
5422 The result is not globally atomic, but works so long as all parallel
5423 references are within #pragma omp atomic directives. According to
5424 responses received from omp@openmp.org, appears to be within spec.
5425 Which makes sense, since that's how several other compilers handle
5426 this situation as well. */
5428 static enum gimplify_status
5429 gimplify_omp_atomic_mutex (tree *expr_p, tree *pre_p, tree addr, tree rhs)
5433 t = built_in_decls[BUILT_IN_GOMP_ATOMIC_START];
5434 t = build_call_expr (t, 0);
5435 gimplify_and_add (t, pre_p);
5437 t = build_fold_indirect_ref (addr);
5438 t = build_gimple_modify_stmt (t, rhs);
5439 gimplify_and_add (t, pre_p);
5441 t = built_in_decls[BUILT_IN_GOMP_ATOMIC_END];
5442 t = build_call_expr (t, 0);
5443 gimplify_and_add (t, pre_p);
5449 /* Gimplify an OMP_ATOMIC statement. */
5451 static enum gimplify_status
5452 gimplify_omp_atomic (tree *expr_p, tree *pre_p)
5454 tree addr = TREE_OPERAND (*expr_p, 0);
5455 tree rhs = TREE_OPERAND (*expr_p, 1);
5456 tree type = TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (addr)));
5457 HOST_WIDE_INT index;
5459 /* Make sure the type is one of the supported sizes. */
5460 index = tree_low_cst (TYPE_SIZE_UNIT (type), 1);
5461 index = exact_log2 (index);
5462 if (index >= 0 && index <= 4)
5464 enum gimplify_status gs;
5467 if (DECL_P (TREE_OPERAND (addr, 0)))
5468 align = DECL_ALIGN_UNIT (TREE_OPERAND (addr, 0));
5469 else if (TREE_CODE (TREE_OPERAND (addr, 0)) == COMPONENT_REF
5470 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (addr, 0), 1))
5472 align = DECL_ALIGN_UNIT (TREE_OPERAND (TREE_OPERAND (addr, 0), 1));
5474 align = TYPE_ALIGN_UNIT (type);
5476 /* __sync builtins require strict data alignment. */
5477 if (exact_log2 (align) >= index)
5479 /* When possible, use specialized atomic update functions. */
5480 if (INTEGRAL_TYPE_P (type) || POINTER_TYPE_P (type))
5482 gs = gimplify_omp_atomic_fetch_op (expr_p, addr, rhs, index);
5483 if (gs != GS_UNHANDLED)
5487 /* If we don't have specialized __sync builtins, try and implement
5488 as a compare and swap loop. */
5489 gs = gimplify_omp_atomic_pipeline (expr_p, pre_p, addr, rhs, index);
5490 if (gs != GS_UNHANDLED)
5495 /* The ultimate fallback is wrapping the operation in a mutex. */
5496 return gimplify_omp_atomic_mutex (expr_p, pre_p, addr, rhs);
5499 /* Gimplifies the expression tree pointed to by EXPR_P. Return 0 if
5500 gimplification failed.
5502 PRE_P points to the list where side effects that must happen before
5503 EXPR should be stored.
5505 POST_P points to the list where side effects that must happen after
5506 EXPR should be stored, or NULL if there is no suitable list. In
5507 that case, we copy the result to a temporary, emit the
5508 post-effects, and then return the temporary.
5510 GIMPLE_TEST_F points to a function that takes a tree T and
5511 returns nonzero if T is in the GIMPLE form requested by the
5512 caller. The GIMPLE predicates are in tree-gimple.c.
5514 This test is used twice. Before gimplification, the test is
5515 invoked to determine whether *EXPR_P is already gimple enough. If
5516 that fails, *EXPR_P is gimplified according to its code and
5517 GIMPLE_TEST_F is called again. If the test still fails, then a new
5518 temporary variable is created and assigned the value of the
5519 gimplified expression.
5521 FALLBACK tells the function what sort of a temporary we want. If the 1
5522 bit is set, an rvalue is OK. If the 2 bit is set, an lvalue is OK.
5523 If both are set, either is OK, but an lvalue is preferable.
5525 The return value is either GS_ERROR or GS_ALL_DONE, since this function
5526 iterates until solution. */
5528 enum gimplify_status
5529 gimplify_expr (tree *expr_p, tree *pre_p, tree *post_p,
5530 bool (* gimple_test_f) (tree), fallback_t fallback)
5533 tree internal_pre = NULL_TREE;
5534 tree internal_post = NULL_TREE;
5536 int is_statement = (pre_p == NULL);
5537 location_t saved_location;
5538 enum gimplify_status ret;
5540 save_expr = *expr_p;
5541 if (save_expr == NULL_TREE)
5544 /* We used to check the predicate here and return immediately if it
5545 succeeds. This is wrong; the design is for gimplification to be
5546 idempotent, and for the predicates to only test for valid forms, not
5547 whether they are fully simplified. */
5549 /* Set up our internal queues if needed. */
5551 pre_p = &internal_pre;
5553 post_p = &internal_post;
5555 saved_location = input_location;
5556 if (save_expr != error_mark_node
5557 && EXPR_HAS_LOCATION (*expr_p))
5558 input_location = EXPR_LOCATION (*expr_p);
5560 /* Loop over the specific gimplifiers until the toplevel node
5561 remains the same. */
5564 /* Strip away as many useless type conversions as possible
5566 STRIP_USELESS_TYPE_CONVERSION (*expr_p);
5568 /* Remember the expr. */
5569 save_expr = *expr_p;
5571 /* Die, die, die, my darling. */
5572 if (save_expr == error_mark_node
5573 || (!GIMPLE_STMT_P (save_expr)
5574 && TREE_TYPE (save_expr)
5575 && TREE_TYPE (save_expr) == error_mark_node))
5581 /* Do any language-specific gimplification. */
5582 ret = lang_hooks.gimplify_expr (expr_p, pre_p, post_p);
5585 if (*expr_p == NULL_TREE)
5587 if (*expr_p != save_expr)
5590 else if (ret != GS_UNHANDLED)
5594 switch (TREE_CODE (*expr_p))
5596 /* First deal with the special cases. */
5598 case POSTINCREMENT_EXPR:
5599 case POSTDECREMENT_EXPR:
5600 case PREINCREMENT_EXPR:
5601 case PREDECREMENT_EXPR:
5602 ret = gimplify_self_mod_expr (expr_p, pre_p, post_p,
5603 fallback != fb_none);
5607 case ARRAY_RANGE_REF:
5611 case VIEW_CONVERT_EXPR:
5612 ret = gimplify_compound_lval (expr_p, pre_p, post_p,
5613 fallback ? fallback : fb_rvalue);
5617 ret = gimplify_cond_expr (expr_p, pre_p, fallback);
5618 /* C99 code may assign to an array in a structure value of a
5619 conditional expression, and this has undefined behavior
5620 only on execution, so create a temporary if an lvalue is
5622 if (fallback == fb_lvalue)
5624 *expr_p = get_initialized_tmp_var (*expr_p, pre_p, post_p);
5625 mark_addressable (*expr_p);
5630 ret = gimplify_call_expr (expr_p, pre_p, fallback != fb_none);
5631 /* C99 code may assign to an array in a structure returned
5632 from a function, and this has undefined behavior only on
5633 execution, so create a temporary if an lvalue is
5635 if (fallback == fb_lvalue)
5637 *expr_p = get_initialized_tmp_var (*expr_p, pre_p, post_p);
5638 mark_addressable (*expr_p);
5646 ret = gimplify_compound_expr (expr_p, pre_p, fallback != fb_none);
5650 case GIMPLE_MODIFY_STMT:
5652 ret = gimplify_modify_expr (expr_p, pre_p, post_p,
5653 fallback != fb_none);
5657 /* The distinction between MODIFY_EXPR and INIT_EXPR is no longer
5659 if (TREE_CODE (*expr_p) == INIT_EXPR)
5660 TREE_SET_CODE (*expr_p, MODIFY_EXPR);
5662 /* Convert MODIFY_EXPR to GIMPLE_MODIFY_STMT. */
5663 if (TREE_CODE (*expr_p) == MODIFY_EXPR)
5664 tree_to_gimple_tuple (expr_p);
5669 case TRUTH_ANDIF_EXPR:
5670 case TRUTH_ORIF_EXPR:
5671 ret = gimplify_boolean_expr (expr_p);
5674 case TRUTH_NOT_EXPR:
5675 TREE_OPERAND (*expr_p, 0)
5676 = gimple_boolify (TREE_OPERAND (*expr_p, 0));
5677 ret = gimplify_expr (&TREE_OPERAND (*expr_p, 0), pre_p, post_p,
5678 is_gimple_val, fb_rvalue);
5679 recalculate_side_effects (*expr_p);
5683 ret = gimplify_addr_expr (expr_p, pre_p, post_p);
5687 ret = gimplify_va_arg_expr (expr_p, pre_p, post_p);
5692 if (IS_EMPTY_STMT (*expr_p))
5698 if (VOID_TYPE_P (TREE_TYPE (*expr_p))
5699 || fallback == fb_none)
5701 /* Just strip a conversion to void (or in void context) and
5703 *expr_p = TREE_OPERAND (*expr_p, 0);
5707 ret = gimplify_conversion (expr_p);
5708 if (ret == GS_ERROR)
5710 if (*expr_p != save_expr)
5714 case FIX_TRUNC_EXPR:
5715 /* unary_expr: ... | '(' cast ')' val | ... */
5716 ret = gimplify_expr (&TREE_OPERAND (*expr_p, 0), pre_p, post_p,
5717 is_gimple_val, fb_rvalue);
5718 recalculate_side_effects (*expr_p);
5722 *expr_p = fold_indirect_ref (*expr_p);
5723 if (*expr_p != save_expr)
5725 /* else fall through. */
5726 case ALIGN_INDIRECT_REF:
5727 case MISALIGNED_INDIRECT_REF:
5728 ret = gimplify_expr (&TREE_OPERAND (*expr_p, 0), pre_p, post_p,
5729 is_gimple_reg, fb_rvalue);
5730 recalculate_side_effects (*expr_p);
5733 /* Constants need not be gimplified. */
5743 /* If we require an lvalue, such as for ADDR_EXPR, retain the
5744 CONST_DECL node. Otherwise the decl is replaceable by its
5746 /* ??? Should be == fb_lvalue, but ADDR_EXPR passes fb_either. */
5747 if (fallback & fb_lvalue)
5750 *expr_p = DECL_INITIAL (*expr_p);
5754 ret = gimplify_decl_expr (expr_p);
5758 /* FIXME make this a decl. */
5763 ret = gimplify_bind_expr (expr_p, pre_p);
5767 ret = gimplify_loop_expr (expr_p, pre_p);
5771 ret = gimplify_switch_expr (expr_p, pre_p);
5775 ret = gimplify_exit_expr (expr_p);
5779 /* If the target is not LABEL, then it is a computed jump
5780 and the target needs to be gimplified. */
5781 if (TREE_CODE (GOTO_DESTINATION (*expr_p)) != LABEL_DECL)
5782 ret = gimplify_expr (&GOTO_DESTINATION (*expr_p), pre_p,
5783 NULL, is_gimple_val, fb_rvalue);
5788 gcc_assert (decl_function_context (LABEL_EXPR_LABEL (*expr_p))
5789 == current_function_decl);
5792 case CASE_LABEL_EXPR:
5793 ret = gimplify_case_label_expr (expr_p);
5797 ret = gimplify_return_expr (*expr_p, pre_p);
5801 /* Don't reduce this in place; let gimplify_init_constructor work its
5802 magic. Buf if we're just elaborating this for side effects, just
5803 gimplify any element that has side-effects. */
5804 if (fallback == fb_none)
5806 unsigned HOST_WIDE_INT ix;
5807 constructor_elt *ce;
5808 tree temp = NULL_TREE;
5810 VEC_iterate (constructor_elt, CONSTRUCTOR_ELTS (*expr_p),
5813 if (TREE_SIDE_EFFECTS (ce->value))
5814 append_to_statement_list (ce->value, &temp);
5819 /* C99 code may assign to an array in a constructed
5820 structure or union, and this has undefined behavior only
5821 on execution, so create a temporary if an lvalue is
5823 else if (fallback == fb_lvalue)
5825 *expr_p = get_initialized_tmp_var (*expr_p, pre_p, post_p);
5826 mark_addressable (*expr_p);
5832 /* The following are special cases that are not handled by the
5833 original GIMPLE grammar. */
5835 /* SAVE_EXPR nodes are converted into a GIMPLE identifier and
5838 ret = gimplify_save_expr (expr_p, pre_p, post_p);
5843 enum gimplify_status r0, r1, r2;
5845 r0 = gimplify_expr (&TREE_OPERAND (*expr_p, 0), pre_p, post_p,
5846 is_gimple_lvalue, fb_either);
5847 r1 = gimplify_expr (&TREE_OPERAND (*expr_p, 1), pre_p, post_p,
5848 is_gimple_val, fb_rvalue);
5849 r2 = gimplify_expr (&TREE_OPERAND (*expr_p, 2), pre_p, post_p,
5850 is_gimple_val, fb_rvalue);
5851 recalculate_side_effects (*expr_p);
5853 ret = MIN (r0, MIN (r1, r2));
5857 case NON_LVALUE_EXPR:
5858 /* This should have been stripped above. */
5862 ret = gimplify_asm_expr (expr_p, pre_p, post_p);
5865 case TRY_FINALLY_EXPR:
5866 case TRY_CATCH_EXPR:
5867 gimplify_to_stmt_list (&TREE_OPERAND (*expr_p, 0));
5868 gimplify_to_stmt_list (&TREE_OPERAND (*expr_p, 1));
5872 case CLEANUP_POINT_EXPR:
5873 ret = gimplify_cleanup_point_expr (expr_p, pre_p);
5877 ret = gimplify_target_expr (expr_p, pre_p, post_p);
5881 gimplify_to_stmt_list (&CATCH_BODY (*expr_p));
5885 case EH_FILTER_EXPR:
5886 gimplify_to_stmt_list (&EH_FILTER_FAILURE (*expr_p));
5890 case CHANGE_DYNAMIC_TYPE_EXPR:
5891 ret = gimplify_expr (&CHANGE_DYNAMIC_TYPE_LOCATION (*expr_p),
5892 pre_p, post_p, is_gimple_reg, fb_lvalue);
5897 enum gimplify_status r0, r1;
5898 r0 = gimplify_expr (&OBJ_TYPE_REF_OBJECT (*expr_p), pre_p, post_p,
5899 is_gimple_val, fb_rvalue);
5900 r1 = gimplify_expr (&OBJ_TYPE_REF_EXPR (*expr_p), pre_p, post_p,
5901 is_gimple_val, fb_rvalue);
5907 /* We get here when taking the address of a label. We mark
5908 the label as "forced"; meaning it can never be removed and
5909 it is a potential target for any computed goto. */
5910 FORCED_LABEL (*expr_p) = 1;
5914 case STATEMENT_LIST:
5915 ret = gimplify_statement_list (expr_p, pre_p);
5918 case WITH_SIZE_EXPR:
5920 gimplify_expr (&TREE_OPERAND (*expr_p, 0), pre_p,
5921 post_p == &internal_post ? NULL : post_p,
5922 gimple_test_f, fallback);
5923 gimplify_expr (&TREE_OPERAND (*expr_p, 1), pre_p, post_p,
5924 is_gimple_val, fb_rvalue);
5930 ret = gimplify_var_or_parm_decl (expr_p);
5934 /* When within an OpenMP context, notice uses of variables. */
5935 if (gimplify_omp_ctxp)
5936 omp_notice_variable (gimplify_omp_ctxp, *expr_p, true);
5941 /* Allow callbacks into the gimplifier during optimization. */
5946 ret = gimplify_omp_parallel (expr_p, pre_p);
5950 ret = gimplify_omp_for (expr_p, pre_p);
5955 ret = gimplify_omp_workshare (expr_p, pre_p);
5962 gimplify_to_stmt_list (&OMP_BODY (*expr_p));
5966 ret = gimplify_omp_atomic (expr_p, pre_p);
5974 case POINTER_PLUS_EXPR:
5975 /* Convert ((type *)A)+offset into &A->field_of_type_and_offset.
5976 The second is gimple immediate saving a need for extra statement.
5978 if (TREE_CODE (TREE_OPERAND (*expr_p, 1)) == INTEGER_CST
5979 && (tmp = maybe_fold_offset_to_reference
5980 (TREE_OPERAND (*expr_p, 0), TREE_OPERAND (*expr_p, 1),
5981 TREE_TYPE (TREE_TYPE (*expr_p)))))
5983 *expr_p = build_fold_addr_expr_with_type (tmp,
5984 TREE_TYPE (*expr_p));
5987 /* Convert (void *)&a + 4 into (void *)&a[1]. */
5988 if (TREE_CODE (TREE_OPERAND (*expr_p, 0)) == NOP_EXPR
5989 && TREE_CODE (TREE_OPERAND (*expr_p, 1)) == INTEGER_CST
5990 && POINTER_TYPE_P (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (*expr_p,
5992 && (tmp = maybe_fold_offset_to_reference
5993 (TREE_OPERAND (TREE_OPERAND (*expr_p, 0), 0),
5994 TREE_OPERAND (*expr_p, 1),
5995 TREE_TYPE (TREE_TYPE
5996 (TREE_OPERAND (TREE_OPERAND (*expr_p, 0),
5999 tmp = build_fold_addr_expr (tmp);
6000 *expr_p = fold_convert (TREE_TYPE (*expr_p), tmp);
6005 switch (TREE_CODE_CLASS (TREE_CODE (*expr_p)))
6007 case tcc_comparison:
6008 /* Handle comparison of objects of non scalar mode aggregates
6009 with a call to memcmp. It would be nice to only have to do
6010 this for variable-sized objects, but then we'd have to allow
6011 the same nest of reference nodes we allow for MODIFY_EXPR and
6014 Compare scalar mode aggregates as scalar mode values. Using
6015 memcmp for them would be very inefficient at best, and is
6016 plain wrong if bitfields are involved. */
6019 tree type = TREE_TYPE (TREE_OPERAND (*expr_p, 1));
6021 if (!AGGREGATE_TYPE_P (type))
6023 else if (TYPE_MODE (type) != BLKmode)
6024 ret = gimplify_scalar_mode_aggregate_compare (expr_p);
6026 ret = gimplify_variable_sized_compare (expr_p);
6031 /* If *EXPR_P does not need to be special-cased, handle it
6032 according to its class. */
6034 ret = gimplify_expr (&TREE_OPERAND (*expr_p, 0), pre_p,
6035 post_p, is_gimple_val, fb_rvalue);
6041 enum gimplify_status r0, r1;
6043 r0 = gimplify_expr (&TREE_OPERAND (*expr_p, 0), pre_p,
6044 post_p, is_gimple_val, fb_rvalue);
6045 r1 = gimplify_expr (&TREE_OPERAND (*expr_p, 1), pre_p,
6046 post_p, is_gimple_val, fb_rvalue);
6052 case tcc_declaration:
6055 goto dont_recalculate;
6058 gcc_assert (TREE_CODE (*expr_p) == TRUTH_AND_EXPR
6059 || TREE_CODE (*expr_p) == TRUTH_OR_EXPR
6060 || TREE_CODE (*expr_p) == TRUTH_XOR_EXPR);
6064 recalculate_side_effects (*expr_p);
6069 /* If we replaced *expr_p, gimplify again. */
6070 if (ret == GS_OK && (*expr_p == NULL || *expr_p == save_expr))
6073 while (ret == GS_OK);
6075 /* If we encountered an error_mark somewhere nested inside, either
6076 stub out the statement or propagate the error back out. */
6077 if (ret == GS_ERROR)
6084 /* This was only valid as a return value from the langhook, which
6085 we handled. Make sure it doesn't escape from any other context. */
6086 gcc_assert (ret != GS_UNHANDLED);
6088 if (fallback == fb_none && *expr_p && !is_gimple_stmt (*expr_p))
6090 /* We aren't looking for a value, and we don't have a valid
6091 statement. If it doesn't have side-effects, throw it away. */
6092 if (!TREE_SIDE_EFFECTS (*expr_p))
6094 else if (!TREE_THIS_VOLATILE (*expr_p))
6096 /* This is probably a _REF that contains something nested that
6097 has side effects. Recurse through the operands to find it. */
6098 enum tree_code code = TREE_CODE (*expr_p);
6105 case VIEW_CONVERT_EXPR:
6106 gimplify_expr (&TREE_OPERAND (*expr_p, 0), pre_p, post_p,
6107 gimple_test_f, fallback);
6111 case ARRAY_RANGE_REF:
6112 gimplify_expr (&TREE_OPERAND (*expr_p, 0), pre_p, post_p,
6113 gimple_test_f, fallback);
6114 gimplify_expr (&TREE_OPERAND (*expr_p, 1), pre_p, post_p,
6115 gimple_test_f, fallback);
6119 /* Anything else with side-effects must be converted to
6120 a valid statement before we get here. */
6126 else if (COMPLETE_TYPE_P (TREE_TYPE (*expr_p))
6127 && TYPE_MODE (TREE_TYPE (*expr_p)) != BLKmode)
6129 /* Historically, the compiler has treated a bare reference
6130 to a non-BLKmode volatile lvalue as forcing a load. */
6131 tree type = TYPE_MAIN_VARIANT (TREE_TYPE (*expr_p));
6132 /* Normally, we do not want to create a temporary for a
6133 TREE_ADDRESSABLE type because such a type should not be
6134 copied by bitwise-assignment. However, we make an
6135 exception here, as all we are doing here is ensuring that
6136 we read the bytes that make up the type. We use
6137 create_tmp_var_raw because create_tmp_var will abort when
6138 given a TREE_ADDRESSABLE type. */
6139 tree tmp = create_tmp_var_raw (type, "vol");
6140 gimple_add_tmp_var (tmp);
6141 *expr_p = build_gimple_modify_stmt (tmp, *expr_p);
6144 /* We can't do anything useful with a volatile reference to
6145 an incomplete type, so just throw it away. Likewise for
6146 a BLKmode type, since any implicit inner load should
6147 already have been turned into an explicit one by the
6148 gimplification process. */
6152 /* If we are gimplifying at the statement level, we're done. Tack
6153 everything together and replace the original statement with the
6155 if (fallback == fb_none || is_statement)
6157 if (internal_pre || internal_post)
6159 append_to_statement_list (*expr_p, &internal_pre);
6160 append_to_statement_list (internal_post, &internal_pre);
6161 annotate_all_with_locus (&internal_pre, input_location);
6162 *expr_p = internal_pre;
6166 else if (TREE_CODE (*expr_p) == STATEMENT_LIST)
6167 annotate_all_with_locus (expr_p, input_location);
6169 annotate_one_with_locus (*expr_p, input_location);
6173 /* Otherwise we're gimplifying a subexpression, so the resulting value is
6176 /* If it's sufficiently simple already, we're done. Unless we are
6177 handling some post-effects internally; if that's the case, we need to
6178 copy into a temp before adding the post-effects to the tree. */
6179 if (!internal_post && (*gimple_test_f) (*expr_p))
6182 /* Otherwise, we need to create a new temporary for the gimplified
6185 /* We can't return an lvalue if we have an internal postqueue. The
6186 object the lvalue refers to would (probably) be modified by the
6187 postqueue; we need to copy the value out first, which means an
6189 if ((fallback & fb_lvalue) && !internal_post
6190 && is_gimple_addressable (*expr_p))
6192 /* An lvalue will do. Take the address of the expression, store it
6193 in a temporary, and replace the expression with an INDIRECT_REF of
6195 tmp = build_fold_addr_expr (*expr_p);
6196 gimplify_expr (&tmp, pre_p, post_p, is_gimple_reg, fb_rvalue);
6197 *expr_p = build1 (INDIRECT_REF, TREE_TYPE (TREE_TYPE (tmp)), tmp);
6199 else if ((fallback & fb_rvalue) && is_gimple_formal_tmp_rhs (*expr_p))
6201 gcc_assert (!VOID_TYPE_P (TREE_TYPE (*expr_p)));
6203 /* An rvalue will do. Assign the gimplified expression into a new
6204 temporary TMP and replace the original expression with TMP. */
6206 if (internal_post || (fallback & fb_lvalue))
6207 /* The postqueue might change the value of the expression between
6208 the initialization and use of the temporary, so we can't use a
6209 formal temp. FIXME do we care? */
6210 *expr_p = get_initialized_tmp_var (*expr_p, pre_p, post_p);
6212 *expr_p = get_formal_tmp_var (*expr_p, pre_p);
6214 if (TREE_CODE (*expr_p) != SSA_NAME)
6215 DECL_GIMPLE_FORMAL_TEMP_P (*expr_p) = 1;
6219 #ifdef ENABLE_CHECKING
6220 if (!(fallback & fb_mayfail))
6222 fprintf (stderr, "gimplification failed:\n");
6223 print_generic_expr (stderr, *expr_p, 0);
6224 debug_tree (*expr_p);
6225 internal_error ("gimplification failed");
6228 gcc_assert (fallback & fb_mayfail);
6229 /* If this is an asm statement, and the user asked for the
6230 impossible, don't die. Fail and let gimplify_asm_expr
6236 /* Make sure the temporary matches our predicate. */
6237 gcc_assert ((*gimple_test_f) (*expr_p));
6241 annotate_all_with_locus (&internal_post, input_location);
6242 append_to_statement_list (internal_post, pre_p);
6246 input_location = saved_location;
6250 /* Look through TYPE for variable-sized objects and gimplify each such
6251 size that we find. Add to LIST_P any statements generated. */
6254 gimplify_type_sizes (tree type, tree *list_p)
6258 if (type == NULL || type == error_mark_node)
6261 /* We first do the main variant, then copy into any other variants. */
6262 type = TYPE_MAIN_VARIANT (type);
6264 /* Avoid infinite recursion. */
6265 if (TYPE_SIZES_GIMPLIFIED (type))
6268 TYPE_SIZES_GIMPLIFIED (type) = 1;
6270 switch (TREE_CODE (type))
6276 gimplify_one_sizepos (&TYPE_MIN_VALUE (type), list_p);
6277 gimplify_one_sizepos (&TYPE_MAX_VALUE (type), list_p);
6279 for (t = TYPE_NEXT_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
6281 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (type);
6282 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (type);
6287 /* These types may not have declarations, so handle them here. */
6288 gimplify_type_sizes (TREE_TYPE (type), list_p);
6289 gimplify_type_sizes (TYPE_DOMAIN (type), list_p);
6294 case QUAL_UNION_TYPE:
6295 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
6296 if (TREE_CODE (field) == FIELD_DECL)
6298 gimplify_one_sizepos (&DECL_FIELD_OFFSET (field), list_p);
6299 gimplify_type_sizes (TREE_TYPE (field), list_p);
6304 case REFERENCE_TYPE:
6305 /* We used to recurse on the pointed-to type here, which turned out to
6306 be incorrect because its definition might refer to variables not
6307 yet initialized at this point if a forward declaration is involved.
6309 It was actually useful for anonymous pointed-to types to ensure
6310 that the sizes evaluation dominates every possible later use of the
6311 values. Restricting to such types here would be safe since there
6312 is no possible forward declaration around, but would introduce an
6313 undesirable middle-end semantic to anonymity. We then defer to
6314 front-ends the responsibility of ensuring that the sizes are
6315 evaluated both early and late enough, e.g. by attaching artificial
6316 type declarations to the tree. */
6323 gimplify_one_sizepos (&TYPE_SIZE (type), list_p);
6324 gimplify_one_sizepos (&TYPE_SIZE_UNIT (type), list_p);
6326 for (t = TYPE_NEXT_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
6328 TYPE_SIZE (t) = TYPE_SIZE (type);
6329 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (type);
6330 TYPE_SIZES_GIMPLIFIED (t) = 1;
6334 /* A subroutine of gimplify_type_sizes to make sure that *EXPR_P,
6335 a size or position, has had all of its SAVE_EXPRs evaluated.
6336 We add any required statements to STMT_P. */
6339 gimplify_one_sizepos (tree *expr_p, tree *stmt_p)
6341 tree type, expr = *expr_p;
6343 /* We don't do anything if the value isn't there, is constant, or contains
6344 A PLACEHOLDER_EXPR. We also don't want to do anything if it's already
6345 a VAR_DECL. If it's a VAR_DECL from another function, the gimplifier
6346 will want to replace it with a new variable, but that will cause problems
6347 if this type is from outside the function. It's OK to have that here. */
6348 if (expr == NULL_TREE || TREE_CONSTANT (expr)
6349 || TREE_CODE (expr) == VAR_DECL
6350 || CONTAINS_PLACEHOLDER_P (expr))
6353 type = TREE_TYPE (expr);
6354 *expr_p = unshare_expr (expr);
6356 gimplify_expr (expr_p, stmt_p, NULL, is_gimple_val, fb_rvalue);
6359 /* Verify that we've an exact type match with the original expression.
6360 In particular, we do not wish to drop a "sizetype" in favour of a
6361 type of similar dimensions. We don't want to pollute the generic
6362 type-stripping code with this knowledge because it doesn't matter
6363 for the bulk of GENERIC/GIMPLE. It only matters that TYPE_SIZE_UNIT
6364 and friends retain their "sizetype-ness". */
6365 if (TREE_TYPE (expr) != type
6366 && TREE_CODE (type) == INTEGER_TYPE
6367 && TYPE_IS_SIZETYPE (type))
6371 *expr_p = create_tmp_var (type, NULL);
6372 tmp = build1 (NOP_EXPR, type, expr);
6373 tmp = build_gimple_modify_stmt (*expr_p, tmp);
6374 if (EXPR_HAS_LOCATION (expr))
6375 SET_EXPR_LOCUS (tmp, EXPR_LOCUS (expr));
6377 SET_EXPR_LOCATION (tmp, input_location);
6379 gimplify_and_add (tmp, stmt_p);
6383 #ifdef ENABLE_CHECKING
6384 /* Compare types A and B for a "close enough" match. */
6387 cpt_same_type (tree a, tree b)
6389 if (useless_type_conversion_p (a, b))
6392 /* ??? The C++ FE decomposes METHOD_TYPES to FUNCTION_TYPES and doesn't
6393 link them together. This routine is intended to catch type errors
6394 that will affect the optimizers, and the optimizers don't add new
6395 dereferences of function pointers, so ignore it. */
6396 if ((TREE_CODE (a) == FUNCTION_TYPE || TREE_CODE (a) == METHOD_TYPE)
6397 && (TREE_CODE (b) == FUNCTION_TYPE || TREE_CODE (b) == METHOD_TYPE))
6400 /* ??? The C FE pushes type qualifiers after the fact into the type of
6401 the element from the type of the array. See build_unary_op's handling
6402 of ADDR_EXPR. This seems wrong -- if we were going to do this, we
6403 should have done it when creating the variable in the first place.
6404 Alternately, why aren't the two array types made variants? */
6405 if (TREE_CODE (a) == ARRAY_TYPE && TREE_CODE (b) == ARRAY_TYPE)
6406 return cpt_same_type (TREE_TYPE (a), TREE_TYPE (b));
6408 /* And because of those, we have to recurse down through pointers. */
6409 if (POINTER_TYPE_P (a) && POINTER_TYPE_P (b))
6410 return cpt_same_type (TREE_TYPE (a), TREE_TYPE (b));
6415 /* Check for some cases of the front end missing cast expressions.
6416 The type of a dereference should correspond to the pointer type;
6417 similarly the type of an address should match its object. */
6420 check_pointer_types_r (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
6421 void *data ATTRIBUTE_UNUSED)
6424 tree ptype, otype, dtype;
6426 switch (TREE_CODE (t))
6430 otype = TREE_TYPE (t);
6431 ptype = TREE_TYPE (TREE_OPERAND (t, 0));
6432 dtype = TREE_TYPE (ptype);
6433 gcc_assert (cpt_same_type (otype, dtype));
6437 ptype = TREE_TYPE (t);
6438 otype = TREE_TYPE (TREE_OPERAND (t, 0));
6439 dtype = TREE_TYPE (ptype);
6440 if (!cpt_same_type (dtype, otype))
6442 /* &array is allowed to produce a pointer to the element, rather than
6443 a pointer to the array type. We must allow this in order to
6444 properly represent assigning the address of an array in C into
6445 pointer to the element type. */
6446 gcc_assert (TREE_CODE (otype) == ARRAY_TYPE
6447 && POINTER_TYPE_P (ptype)
6448 && cpt_same_type (dtype, TREE_TYPE (otype)));
6462 /* Gimplify the body of statements pointed to by BODY_P. FNDECL is the
6463 function decl containing BODY. */
6466 gimplify_body (tree *body_p, tree fndecl, bool do_parms)
6468 location_t saved_location = input_location;
6469 tree body, parm_stmts;
6471 timevar_push (TV_TREE_GIMPLIFY);
6473 gcc_assert (gimplify_ctxp == NULL);
6474 push_gimplify_context ();
6476 /* Unshare most shared trees in the body and in that of any nested functions.
6477 It would seem we don't have to do this for nested functions because
6478 they are supposed to be output and then the outer function gimplified
6479 first, but the g++ front end doesn't always do it that way. */
6480 unshare_body (body_p, fndecl);
6481 unvisit_body (body_p, fndecl);
6483 /* Make sure input_location isn't set to something wierd. */
6484 input_location = DECL_SOURCE_LOCATION (fndecl);
6486 /* Resolve callee-copies. This has to be done before processing
6487 the body so that DECL_VALUE_EXPR gets processed correctly. */
6488 parm_stmts = do_parms ? gimplify_parameters () : NULL;
6490 /* Gimplify the function's body. */
6491 gimplify_stmt (body_p);
6495 body = alloc_stmt_list ();
6496 else if (TREE_CODE (body) == STATEMENT_LIST)
6498 tree t = expr_only (*body_p);
6503 /* If there isn't an outer BIND_EXPR, add one. */
6504 if (TREE_CODE (body) != BIND_EXPR)
6506 tree b = build3 (BIND_EXPR, void_type_node, NULL_TREE,
6507 NULL_TREE, NULL_TREE);
6508 TREE_SIDE_EFFECTS (b) = 1;
6509 append_to_statement_list_force (body, &BIND_EXPR_BODY (b));
6513 /* If we had callee-copies statements, insert them at the beginning
6517 append_to_statement_list_force (BIND_EXPR_BODY (body), &parm_stmts);
6518 BIND_EXPR_BODY (body) = parm_stmts;
6521 /* Unshare again, in case gimplification was sloppy. */
6522 unshare_all_trees (body);
6526 pop_gimplify_context (body);
6527 gcc_assert (gimplify_ctxp == NULL);
6529 #ifdef ENABLE_CHECKING
6530 walk_tree (body_p, check_pointer_types_r, NULL, NULL);
6533 timevar_pop (TV_TREE_GIMPLIFY);
6534 input_location = saved_location;
6537 /* Entry point to the gimplification pass. FNDECL is the FUNCTION_DECL
6538 node for the function we want to gimplify. */
6541 gimplify_function_tree (tree fndecl)
6543 tree oldfn, parm, ret;
6545 oldfn = current_function_decl;
6546 current_function_decl = fndecl;
6547 cfun = DECL_STRUCT_FUNCTION (fndecl);
6549 allocate_struct_function (fndecl);
6551 for (parm = DECL_ARGUMENTS (fndecl); parm ; parm = TREE_CHAIN (parm))
6553 /* Preliminarily mark non-addressed complex variables as eligible
6554 for promotion to gimple registers. We'll transform their uses
6556 if ((TREE_CODE (TREE_TYPE (parm)) == COMPLEX_TYPE
6557 || TREE_CODE (TREE_TYPE (parm)) == VECTOR_TYPE)
6558 && !TREE_THIS_VOLATILE (parm)
6559 && !needs_to_live_in_memory (parm))
6560 DECL_GIMPLE_REG_P (parm) = 1;
6563 ret = DECL_RESULT (fndecl);
6564 if ((TREE_CODE (TREE_TYPE (ret)) == COMPLEX_TYPE
6565 || TREE_CODE (TREE_TYPE (ret)) == VECTOR_TYPE)
6566 && !needs_to_live_in_memory (ret))
6567 DECL_GIMPLE_REG_P (ret) = 1;
6569 gimplify_body (&DECL_SAVED_TREE (fndecl), fndecl, true);
6571 /* If we're instrumenting function entry/exit, then prepend the call to
6572 the entry hook and wrap the whole function in a TRY_FINALLY_EXPR to
6573 catch the exit hook. */
6574 /* ??? Add some way to ignore exceptions for this TFE. */
6575 if (flag_instrument_function_entry_exit
6576 && ! DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (fndecl))
6580 tf = build2 (TRY_FINALLY_EXPR, void_type_node, NULL, NULL);
6581 TREE_SIDE_EFFECTS (tf) = 1;
6582 x = DECL_SAVED_TREE (fndecl);
6583 append_to_statement_list (x, &TREE_OPERAND (tf, 0));
6584 x = implicit_built_in_decls[BUILT_IN_PROFILE_FUNC_EXIT];
6585 x = build_call_expr (x, 0);
6586 append_to_statement_list (x, &TREE_OPERAND (tf, 1));
6588 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
6589 TREE_SIDE_EFFECTS (bind) = 1;
6590 x = implicit_built_in_decls[BUILT_IN_PROFILE_FUNC_ENTER];
6591 x = build_call_expr (x, 0);
6592 append_to_statement_list (x, &BIND_EXPR_BODY (bind));
6593 append_to_statement_list (tf, &BIND_EXPR_BODY (bind));
6595 DECL_SAVED_TREE (fndecl) = bind;
6598 cfun->gimplified = true;
6599 current_function_decl = oldfn;
6600 cfun = oldfn ? DECL_STRUCT_FUNCTION (oldfn) : NULL;
6603 /* Expands EXPR to list of gimple statements STMTS. If SIMPLE is true,
6604 force the result to be either ssa_name or an invariant, otherwise
6605 just force it to be a rhs expression. If VAR is not NULL, make the
6606 base variable of the final destination be VAR if suitable. */
6609 force_gimple_operand (tree expr, tree *stmts, bool simple, tree var)
6612 enum gimplify_status ret;
6613 gimple_predicate gimple_test_f;
6617 if (is_gimple_val (expr))
6620 gimple_test_f = simple ? is_gimple_val : is_gimple_reg_rhs;
6622 push_gimplify_context ();
6623 gimplify_ctxp->into_ssa = gimple_in_ssa_p (cfun);
6626 expr = build_gimple_modify_stmt (var, expr);
6628 ret = gimplify_expr (&expr, stmts, NULL,
6629 gimple_test_f, fb_rvalue);
6630 gcc_assert (ret != GS_ERROR);
6632 if (gimple_referenced_vars (cfun))
6634 for (t = gimplify_ctxp->temps; t ; t = TREE_CHAIN (t))
6635 add_referenced_var (t);
6638 pop_gimplify_context (NULL);
6643 /* Invokes force_gimple_operand for EXPR with parameters SIMPLE_P and VAR. If
6644 some statements are produced, emits them before BSI. */
6647 force_gimple_operand_bsi (block_stmt_iterator *bsi, tree expr,
6648 bool simple_p, tree var)
6652 expr = force_gimple_operand (expr, &stmts, simple_p, var);
6654 bsi_insert_before (bsi, stmts, BSI_SAME_STMT);
6659 #include "gt-gimplify.h"