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 Free Software Foundation, Inc.
4 Major work done by Sebastian Pop <s.pop@laposte.net>,
5 Diego Novillo <dnovillo@redhat.com> and Jason Merrill <jason@redhat.com>.
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify it under
10 the terms of the GNU General Public License as published by the Free
11 Software Foundation; either version 2, or (at your option) any later
14 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
15 WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING. If not, write to the Free
21 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
26 #include "coretypes.h"
31 #include "tree-gimple.h"
32 #include "tree-inline.h"
33 #include "diagnostic.h"
34 #include "langhooks.h"
35 #include "langhooks-def.h"
36 #include "tree-flow.h"
50 #include "pointer-set.h"
53 enum gimplify_omp_var_data
59 GOVD_FIRSTPRIVATE
= 16,
60 GOVD_LASTPRIVATE
= 32,
63 GOVD_DEBUG_PRIVATE
= 256,
64 GOVD_DATA_SHARE_CLASS
= (GOVD_SHARED
| GOVD_PRIVATE
| GOVD_FIRSTPRIVATE
65 | GOVD_LASTPRIVATE
| GOVD_REDUCTION
| GOVD_LOCAL
)
68 struct gimplify_omp_ctx
70 struct gimplify_omp_ctx
*outer_context
;
72 struct pointer_set_t
*privatized_types
;
74 enum omp_clause_default_kind default_kind
;
80 struct gimplify_ctx
*prev_context
;
82 tree current_bind_expr
;
84 tree conditional_cleanups
;
88 VEC(tree
,heap
) *case_labels
;
89 /* The formal temporary table. Should this be persistent? */
97 static struct gimplify_ctx
*gimplify_ctxp
;
98 static struct gimplify_omp_ctx
*gimplify_omp_ctxp
;
102 /* Formal (expression) temporary table handling: Multiple occurrences of
103 the same scalar expression are evaluated into the same temporary. */
105 typedef struct gimple_temp_hash_elt
108 tree temp
; /* Value */
111 /* Forward declarations. */
112 static enum gimplify_status
gimplify_compound_expr (tree
*, tree
*, bool);
113 #ifdef ENABLE_CHECKING
114 static bool cpt_same_type (tree a
, tree b
);
118 /* Return a hash value for a formal temporary table entry. */
121 gimple_tree_hash (const void *p
)
123 tree t
= ((const elt_t
*) p
)->val
;
124 return iterative_hash_expr (t
, 0);
127 /* Compare two formal temporary table entries. */
130 gimple_tree_eq (const void *p1
, const void *p2
)
132 tree t1
= ((const elt_t
*) p1
)->val
;
133 tree t2
= ((const elt_t
*) p2
)->val
;
134 enum tree_code code
= TREE_CODE (t1
);
136 if (TREE_CODE (t2
) != code
137 || TREE_TYPE (t1
) != TREE_TYPE (t2
))
140 if (!operand_equal_p (t1
, t2
, 0))
143 /* Only allow them to compare equal if they also hash equal; otherwise
144 results are nondeterminate, and we fail bootstrap comparison. */
145 gcc_assert (gimple_tree_hash (p1
) == gimple_tree_hash (p2
));
150 /* Set up a context for the gimplifier. */
153 push_gimplify_context (void)
155 struct gimplify_ctx
*c
;
157 c
= (struct gimplify_ctx
*) xcalloc (1, sizeof (struct gimplify_ctx
));
158 c
->prev_context
= gimplify_ctxp
;
160 c
->temp_htab
= htab_create (1000, gimple_tree_hash
, gimple_tree_eq
, free
);
165 /* Tear down a context for the gimplifier. If BODY is non-null, then
166 put the temporaries into the outer BIND_EXPR. Otherwise, put them
167 in the unexpanded_var_list. */
170 pop_gimplify_context (tree body
)
172 struct gimplify_ctx
*c
= gimplify_ctxp
;
175 gcc_assert (c
&& !c
->current_bind_expr
);
176 gimplify_ctxp
= c
->prev_context
;
178 for (t
= c
->temps
; t
; t
= TREE_CHAIN (t
))
179 DECL_GIMPLE_FORMAL_TEMP_P (t
) = 0;
182 declare_tmp_vars (c
->temps
, body
);
184 record_vars (c
->temps
);
187 htab_delete (c
->temp_htab
);
192 gimple_push_bind_expr (tree bind
)
194 TREE_CHAIN (bind
) = gimplify_ctxp
->current_bind_expr
;
195 gimplify_ctxp
->current_bind_expr
= bind
;
199 gimple_pop_bind_expr (void)
201 gimplify_ctxp
->current_bind_expr
202 = TREE_CHAIN (gimplify_ctxp
->current_bind_expr
);
206 gimple_current_bind_expr (void)
208 return gimplify_ctxp
->current_bind_expr
;
211 /* Returns true iff there is a COND_EXPR between us and the innermost
212 CLEANUP_POINT_EXPR. This info is used by gimple_push_cleanup. */
215 gimple_conditional_context (void)
217 return gimplify_ctxp
->conditions
> 0;
220 /* Note that we've entered a COND_EXPR. */
223 gimple_push_condition (void)
225 #ifdef ENABLE_CHECKING
226 if (gimplify_ctxp
->conditions
== 0)
227 gcc_assert (!gimplify_ctxp
->conditional_cleanups
);
229 ++(gimplify_ctxp
->conditions
);
232 /* Note that we've left a COND_EXPR. If we're back at unconditional scope
233 now, add any conditional cleanups we've seen to the prequeue. */
236 gimple_pop_condition (tree
*pre_p
)
238 int conds
= --(gimplify_ctxp
->conditions
);
240 gcc_assert (conds
>= 0);
243 append_to_statement_list (gimplify_ctxp
->conditional_cleanups
, pre_p
);
244 gimplify_ctxp
->conditional_cleanups
= NULL_TREE
;
248 /* A stable comparison routine for use with splay trees and DECLs. */
251 splay_tree_compare_decl_uid (splay_tree_key xa
, splay_tree_key xb
)
256 return DECL_UID (a
) - DECL_UID (b
);
259 /* Create a new omp construct that deals with variable remapping. */
261 static struct gimplify_omp_ctx
*
262 new_omp_context (bool is_parallel
)
264 struct gimplify_omp_ctx
*c
;
266 c
= XCNEW (struct gimplify_omp_ctx
);
267 c
->outer_context
= gimplify_omp_ctxp
;
268 c
->variables
= splay_tree_new (splay_tree_compare_decl_uid
, 0, 0);
269 c
->privatized_types
= pointer_set_create ();
270 c
->location
= input_location
;
271 c
->is_parallel
= is_parallel
;
272 c
->default_kind
= OMP_CLAUSE_DEFAULT_SHARED
;
277 /* Destroy an omp construct that deals with variable remapping. */
280 delete_omp_context (struct gimplify_omp_ctx
*c
)
282 splay_tree_delete (c
->variables
);
283 pointer_set_destroy (c
->privatized_types
);
287 static void omp_add_variable (struct gimplify_omp_ctx
*, tree
, unsigned int);
288 static bool omp_notice_variable (struct gimplify_omp_ctx
*, tree
, bool);
290 /* A subroutine of append_to_statement_list{,_force}. T is not NULL. */
293 append_to_statement_list_1 (tree t
, tree
*list_p
)
296 tree_stmt_iterator i
;
300 if (t
&& TREE_CODE (t
) == STATEMENT_LIST
)
305 *list_p
= list
= alloc_stmt_list ();
309 tsi_link_after (&i
, t
, TSI_CONTINUE_LINKING
);
312 /* Add T to the end of the list container pointed to by LIST_P.
313 If T is an expression with no effects, it is ignored. */
316 append_to_statement_list (tree t
, tree
*list_p
)
318 if (t
&& TREE_SIDE_EFFECTS (t
))
319 append_to_statement_list_1 (t
, list_p
);
322 /* Similar, but the statement is always added, regardless of side effects. */
325 append_to_statement_list_force (tree t
, tree
*list_p
)
328 append_to_statement_list_1 (t
, list_p
);
331 /* Both gimplify the statement T and append it to LIST_P. */
334 gimplify_and_add (tree t
, tree
*list_p
)
337 append_to_statement_list (t
, list_p
);
340 /* Strip off a legitimate source ending from the input string NAME of
341 length LEN. Rather than having to know the names used by all of
342 our front ends, we strip off an ending of a period followed by
343 up to five characters. (Java uses ".class".) */
346 remove_suffix (char *name
, int len
)
350 for (i
= 2; i
< 8 && len
> i
; i
++)
352 if (name
[len
- i
] == '.')
354 name
[len
- i
] = '\0';
360 /* Create a nameless artificial label and put it in the current function
361 context. Returns the newly created label. */
364 create_artificial_label (void)
366 tree lab
= build_decl (LABEL_DECL
, NULL_TREE
, void_type_node
);
368 DECL_ARTIFICIAL (lab
) = 1;
369 DECL_IGNORED_P (lab
) = 1;
370 DECL_CONTEXT (lab
) = current_function_decl
;
374 /* Subroutine for find_single_pointer_decl. */
377 find_single_pointer_decl_1 (tree
*tp
, int *walk_subtrees ATTRIBUTE_UNUSED
,
380 tree
*pdecl
= (tree
*) data
;
382 if (DECL_P (*tp
) && POINTER_TYPE_P (TREE_TYPE (*tp
)))
386 /* We already found a pointer decl; return anything other
387 than NULL_TREE to unwind from walk_tree signalling that
388 we have a duplicate. */
397 /* Find the single DECL of pointer type in the tree T and return it.
398 If there are zero or more than one such DECLs, return NULL. */
401 find_single_pointer_decl (tree t
)
403 tree decl
= NULL_TREE
;
405 if (walk_tree (&t
, find_single_pointer_decl_1
, &decl
, NULL
))
407 /* find_single_pointer_decl_1 returns a non-zero value, causing
408 walk_tree to return a non-zero value, to indicate that it
409 found more than one pointer DECL. */
416 /* Create a new temporary name with PREFIX. Returns an identifier. */
418 static GTY(()) unsigned int tmp_var_id_num
;
421 create_tmp_var_name (const char *prefix
)
427 char *preftmp
= ASTRDUP (prefix
);
429 remove_suffix (preftmp
, strlen (preftmp
));
433 ASM_FORMAT_PRIVATE_NAME (tmp_name
, prefix
? prefix
: "T", tmp_var_id_num
++);
434 return get_identifier (tmp_name
);
438 /* Create a new temporary variable declaration of type TYPE.
439 Does NOT push it into the current binding. */
442 create_tmp_var_raw (tree type
, const char *prefix
)
447 /* Make the type of the variable writable. */
448 new_type
= build_type_variant (type
, 0, 0);
449 TYPE_ATTRIBUTES (new_type
) = TYPE_ATTRIBUTES (type
);
451 tmp_var
= build_decl (VAR_DECL
, prefix
? create_tmp_var_name (prefix
) : NULL
,
454 /* The variable was declared by the compiler. */
455 DECL_ARTIFICIAL (tmp_var
) = 1;
456 /* And we don't want debug info for it. */
457 DECL_IGNORED_P (tmp_var
) = 1;
459 /* Make the variable writable. */
460 TREE_READONLY (tmp_var
) = 0;
462 DECL_EXTERNAL (tmp_var
) = 0;
463 TREE_STATIC (tmp_var
) = 0;
464 TREE_USED (tmp_var
) = 1;
469 /* Create a new temporary variable declaration of type TYPE. DOES push the
470 variable into the current binding. Further, assume that this is called
471 only from gimplification or optimization, at which point the creation of
472 certain types are bugs. */
475 create_tmp_var (tree type
, const char *prefix
)
479 /* We don't allow types that are addressable (meaning we can't make copies),
480 incomplete, or of variable size. */
481 gcc_assert (!TREE_ADDRESSABLE (type
)
482 && COMPLETE_TYPE_P (type
)
483 && TREE_CODE (TYPE_SIZE_UNIT (type
)) == INTEGER_CST
);
485 tmp_var
= create_tmp_var_raw (type
, prefix
);
486 gimple_add_tmp_var (tmp_var
);
490 /* Given a tree, try to return a useful variable name that we can use
491 to prefix a temporary that is being assigned the value of the tree.
492 I.E. given <temp> = &A, return A. */
500 STRIP_NOPS (stripped_decl
);
501 if (DECL_P (stripped_decl
) && DECL_NAME (stripped_decl
))
502 return IDENTIFIER_POINTER (DECL_NAME (stripped_decl
));
505 switch (TREE_CODE (stripped_decl
))
508 return get_name (TREE_OPERAND (stripped_decl
, 0));
516 /* Create a temporary with a name derived from VAL. Subroutine of
517 lookup_tmp_var; nobody else should call this function. */
520 create_tmp_from_val (tree val
)
522 return create_tmp_var (TYPE_MAIN_VARIANT (TREE_TYPE (val
)), get_name (val
));
525 /* Create a temporary to hold the value of VAL. If IS_FORMAL, try to reuse
526 an existing expression temporary. */
529 lookup_tmp_var (tree val
, bool is_formal
)
533 /* If not optimizing, never really reuse a temporary. local-alloc
534 won't allocate any variable that is used in more than one basic
535 block, which means it will go into memory, causing much extra
536 work in reload and final and poorer code generation, outweighing
537 the extra memory allocation here. */
538 if (!optimize
|| !is_formal
|| TREE_SIDE_EFFECTS (val
))
539 ret
= create_tmp_from_val (val
);
546 slot
= htab_find_slot (gimplify_ctxp
->temp_htab
, (void *)&elt
, INSERT
);
549 elt_p
= XNEW (elt_t
);
551 elt_p
->temp
= ret
= create_tmp_from_val (val
);
552 *slot
= (void *) elt_p
;
556 elt_p
= (elt_t
*) *slot
;
562 DECL_GIMPLE_FORMAL_TEMP_P (ret
) = 1;
567 /* Returns a formal temporary variable initialized with VAL. PRE_P is as
568 in gimplify_expr. Only use this function if:
570 1) The value of the unfactored expression represented by VAL will not
571 change between the initialization and use of the temporary, and
572 2) The temporary will not be otherwise modified.
574 For instance, #1 means that this is inappropriate for SAVE_EXPR temps,
575 and #2 means it is inappropriate for && temps.
577 For other cases, use get_initialized_tmp_var instead. */
580 internal_get_tmp_var (tree val
, tree
*pre_p
, tree
*post_p
, bool is_formal
)
584 gimplify_expr (&val
, pre_p
, post_p
, is_gimple_formal_tmp_rhs
, fb_rvalue
);
586 t
= lookup_tmp_var (val
, is_formal
);
590 tree u
= find_single_pointer_decl (val
);
592 if (u
&& TREE_CODE (u
) == VAR_DECL
&& DECL_BASED_ON_RESTRICT_P (u
))
593 u
= DECL_GET_RESTRICT_BASE (u
);
594 if (u
&& TYPE_RESTRICT (TREE_TYPE (u
)))
596 if (DECL_BASED_ON_RESTRICT_P (t
))
597 gcc_assert (u
== DECL_GET_RESTRICT_BASE (t
));
600 DECL_BASED_ON_RESTRICT_P (t
) = 1;
601 SET_DECL_RESTRICT_BASE (t
, u
);
606 if (TREE_CODE (TREE_TYPE (t
)) == COMPLEX_TYPE
)
607 DECL_COMPLEX_GIMPLE_REG_P (t
) = 1;
609 mod
= build2 (MODIFY_EXPR
, TREE_TYPE (t
), t
, val
);
611 if (EXPR_HAS_LOCATION (val
))
612 SET_EXPR_LOCUS (mod
, EXPR_LOCUS (val
));
614 SET_EXPR_LOCATION (mod
, input_location
);
616 /* gimplify_modify_expr might want to reduce this further. */
617 gimplify_and_add (mod
, pre_p
);
619 /* If we're gimplifying into ssa, gimplify_modify_expr will have
620 given our temporary an ssa name. Find and return it. */
621 if (gimplify_ctxp
->into_ssa
)
622 t
= TREE_OPERAND (mod
, 0);
627 /* Returns a formal temporary variable initialized with VAL. PRE_P
628 points to a statement list where side-effects needed to compute VAL
632 get_formal_tmp_var (tree val
, tree
*pre_p
)
634 return internal_get_tmp_var (val
, pre_p
, NULL
, true);
637 /* Returns a temporary variable initialized with VAL. PRE_P and POST_P
638 are as in gimplify_expr. */
641 get_initialized_tmp_var (tree val
, tree
*pre_p
, tree
*post_p
)
643 return internal_get_tmp_var (val
, pre_p
, post_p
, false);
646 /* Declares all the variables in VARS in SCOPE. */
649 declare_tmp_vars (tree vars
, tree scope
)
656 /* C99 mode puts the default 'return 0;' for main outside the outer
657 braces. So drill down until we find an actual scope. */
658 while (TREE_CODE (scope
) == COMPOUND_EXPR
)
659 scope
= TREE_OPERAND (scope
, 0);
661 gcc_assert (TREE_CODE (scope
) == BIND_EXPR
);
663 temps
= nreverse (last
);
664 TREE_CHAIN (last
) = BIND_EXPR_VARS (scope
);
665 BIND_EXPR_VARS (scope
) = temps
;
670 gimple_add_tmp_var (tree tmp
)
672 gcc_assert (!TREE_CHAIN (tmp
) && !DECL_SEEN_IN_BIND_EXPR_P (tmp
));
674 DECL_CONTEXT (tmp
) = current_function_decl
;
675 DECL_SEEN_IN_BIND_EXPR_P (tmp
) = 1;
679 TREE_CHAIN (tmp
) = gimplify_ctxp
->temps
;
680 gimplify_ctxp
->temps
= tmp
;
682 /* Mark temporaries local within the nearest enclosing parallel. */
683 if (gimplify_omp_ctxp
)
685 struct gimplify_omp_ctx
*ctx
= gimplify_omp_ctxp
;
686 while (ctx
&& !ctx
->is_parallel
)
687 ctx
= ctx
->outer_context
;
689 omp_add_variable (ctx
, tmp
, GOVD_LOCAL
| GOVD_SEEN
);
695 declare_tmp_vars (tmp
, DECL_SAVED_TREE (current_function_decl
));
698 /* Determines whether to assign a locus to the statement STMT. */
701 should_carry_locus_p (tree stmt
)
703 /* Don't emit a line note for a label. We particularly don't want to
704 emit one for the break label, since it doesn't actually correspond
705 to the beginning of the loop/switch. */
706 if (TREE_CODE (stmt
) == LABEL_EXPR
)
709 /* Do not annotate empty statements, since it confuses gcov. */
710 if (!TREE_SIDE_EFFECTS (stmt
))
717 annotate_one_with_locus (tree t
, location_t locus
)
719 if (EXPR_P (t
) && ! EXPR_HAS_LOCATION (t
) && should_carry_locus_p (t
))
720 SET_EXPR_LOCATION (t
, locus
);
724 annotate_all_with_locus (tree
*stmt_p
, location_t locus
)
726 tree_stmt_iterator i
;
731 for (i
= tsi_start (*stmt_p
); !tsi_end_p (i
); tsi_next (&i
))
733 tree t
= tsi_stmt (i
);
735 /* Assuming we've already been gimplified, we shouldn't
736 see nested chaining constructs anymore. */
737 gcc_assert (TREE_CODE (t
) != STATEMENT_LIST
738 && TREE_CODE (t
) != COMPOUND_EXPR
);
740 annotate_one_with_locus (t
, locus
);
744 /* Similar to copy_tree_r() but do not copy SAVE_EXPR or TARGET_EXPR nodes.
745 These nodes model computations that should only be done once. If we
746 were to unshare something like SAVE_EXPR(i++), the gimplification
747 process would create wrong code. */
750 mostly_copy_tree_r (tree
*tp
, int *walk_subtrees
, void *data
)
752 enum tree_code code
= TREE_CODE (*tp
);
753 /* Don't unshare types, decls, constants and SAVE_EXPR nodes. */
754 if (TREE_CODE_CLASS (code
) == tcc_type
755 || TREE_CODE_CLASS (code
) == tcc_declaration
756 || TREE_CODE_CLASS (code
) == tcc_constant
757 || code
== SAVE_EXPR
|| code
== TARGET_EXPR
758 /* We can't do anything sensible with a BLOCK used as an expression,
759 but we also can't just die when we see it because of non-expression
760 uses. So just avert our eyes and cross our fingers. Silly Java. */
765 gcc_assert (code
!= BIND_EXPR
);
766 copy_tree_r (tp
, walk_subtrees
, data
);
772 /* Callback for walk_tree to unshare most of the shared trees rooted at
773 *TP. If *TP has been visited already (i.e., TREE_VISITED (*TP) == 1),
774 then *TP is deep copied by calling copy_tree_r.
776 This unshares the same trees as copy_tree_r with the exception of
777 SAVE_EXPR nodes. These nodes model computations that should only be
778 done once. If we were to unshare something like SAVE_EXPR(i++), the
779 gimplification process would create wrong code. */
782 copy_if_shared_r (tree
*tp
, int *walk_subtrees ATTRIBUTE_UNUSED
,
783 void *data ATTRIBUTE_UNUSED
)
786 enum tree_code code
= TREE_CODE (t
);
788 /* Skip types, decls, and constants. But we do want to look at their
789 types and the bounds of types. Mark them as visited so we properly
790 unmark their subtrees on the unmark pass. If we've already seen them,
791 don't look down further. */
792 if (TREE_CODE_CLASS (code
) == tcc_type
793 || TREE_CODE_CLASS (code
) == tcc_declaration
794 || TREE_CODE_CLASS (code
) == tcc_constant
)
796 if (TREE_VISITED (t
))
799 TREE_VISITED (t
) = 1;
802 /* If this node has been visited already, unshare it and don't look
804 else if (TREE_VISITED (t
))
806 walk_tree (tp
, mostly_copy_tree_r
, NULL
, NULL
);
810 /* Otherwise, mark the tree as visited and keep looking. */
812 TREE_VISITED (t
) = 1;
818 unmark_visited_r (tree
*tp
, int *walk_subtrees ATTRIBUTE_UNUSED
,
819 void *data ATTRIBUTE_UNUSED
)
821 if (TREE_VISITED (*tp
))
822 TREE_VISITED (*tp
) = 0;
829 /* Unshare all the trees in BODY_P, a pointer into the body of FNDECL, and the
830 bodies of any nested functions if we are unsharing the entire body of
834 unshare_body (tree
*body_p
, tree fndecl
)
836 struct cgraph_node
*cgn
= cgraph_node (fndecl
);
838 walk_tree (body_p
, copy_if_shared_r
, NULL
, NULL
);
839 if (body_p
== &DECL_SAVED_TREE (fndecl
))
840 for (cgn
= cgn
->nested
; cgn
; cgn
= cgn
->next_nested
)
841 unshare_body (&DECL_SAVED_TREE (cgn
->decl
), cgn
->decl
);
844 /* Likewise, but mark all trees as not visited. */
847 unvisit_body (tree
*body_p
, tree fndecl
)
849 struct cgraph_node
*cgn
= cgraph_node (fndecl
);
851 walk_tree (body_p
, unmark_visited_r
, NULL
, NULL
);
852 if (body_p
== &DECL_SAVED_TREE (fndecl
))
853 for (cgn
= cgn
->nested
; cgn
; cgn
= cgn
->next_nested
)
854 unvisit_body (&DECL_SAVED_TREE (cgn
->decl
), cgn
->decl
);
857 /* Unshare T and all the trees reached from T via TREE_CHAIN. */
860 unshare_all_trees (tree t
)
862 walk_tree (&t
, copy_if_shared_r
, NULL
, NULL
);
863 walk_tree (&t
, unmark_visited_r
, NULL
, NULL
);
866 /* Unconditionally make an unshared copy of EXPR. This is used when using
867 stored expressions which span multiple functions, such as BINFO_VTABLE,
868 as the normal unsharing process can't tell that they're shared. */
871 unshare_expr (tree expr
)
873 walk_tree (&expr
, mostly_copy_tree_r
, NULL
, NULL
);
877 /* A terser interface for building a representation of an exception
881 gimple_build_eh_filter (tree body
, tree allowed
, tree failure
)
885 /* FIXME should the allowed types go in TREE_TYPE? */
886 t
= build2 (EH_FILTER_EXPR
, void_type_node
, allowed
, NULL_TREE
);
887 append_to_statement_list (failure
, &EH_FILTER_FAILURE (t
));
889 t
= build2 (TRY_CATCH_EXPR
, void_type_node
, NULL_TREE
, t
);
890 append_to_statement_list (body
, &TREE_OPERAND (t
, 0));
896 /* WRAPPER is a code such as BIND_EXPR or CLEANUP_POINT_EXPR which can both
897 contain statements and have a value. Assign its value to a temporary
898 and give it void_type_node. Returns the temporary, or NULL_TREE if
899 WRAPPER was already void. */
902 voidify_wrapper_expr (tree wrapper
, tree temp
)
904 if (!VOID_TYPE_P (TREE_TYPE (wrapper
)))
906 tree
*p
, sub
= wrapper
;
909 /* Set p to point to the body of the wrapper. */
910 switch (TREE_CODE (sub
))
913 /* For a BIND_EXPR, the body is operand 1. */
914 p
= &BIND_EXPR_BODY (sub
);
918 p
= &TREE_OPERAND (sub
, 0);
922 /* Advance to the last statement. Set all container types to void. */
923 if (TREE_CODE (*p
) == STATEMENT_LIST
)
925 tree_stmt_iterator i
= tsi_last (*p
);
926 p
= tsi_end_p (i
) ? NULL
: tsi_stmt_ptr (i
);
930 for (; TREE_CODE (*p
) == COMPOUND_EXPR
; p
= &TREE_OPERAND (*p
, 1))
932 TREE_SIDE_EFFECTS (*p
) = 1;
933 TREE_TYPE (*p
) = void_type_node
;
937 if (p
== NULL
|| IS_EMPTY_STMT (*p
))
939 /* Look through exception handling. */
940 else if (TREE_CODE (*p
) == TRY_FINALLY_EXPR
941 || TREE_CODE (*p
) == TRY_CATCH_EXPR
)
946 /* The C++ frontend already did this for us. */
947 else if (TREE_CODE (*p
) == INIT_EXPR
948 || TREE_CODE (*p
) == TARGET_EXPR
)
949 temp
= TREE_OPERAND (*p
, 0);
950 /* If we're returning a dereference, move the dereference
951 outside the wrapper. */
952 else if (TREE_CODE (*p
) == INDIRECT_REF
)
954 tree ptr
= TREE_OPERAND (*p
, 0);
955 temp
= create_tmp_var (TREE_TYPE (ptr
), "retval");
956 *p
= build2 (MODIFY_EXPR
, TREE_TYPE (ptr
), temp
, ptr
);
957 temp
= build1 (INDIRECT_REF
, TREE_TYPE (TREE_TYPE (temp
)), temp
);
958 /* If this is a BIND_EXPR for a const inline function, it might not
959 have TREE_SIDE_EFFECTS set. That is no longer accurate. */
960 TREE_SIDE_EFFECTS (wrapper
) = 1;
965 temp
= create_tmp_var (TREE_TYPE (wrapper
), "retval");
966 *p
= build2 (MODIFY_EXPR
, TREE_TYPE (temp
), temp
, *p
);
967 TREE_SIDE_EFFECTS (wrapper
) = 1;
970 TREE_TYPE (wrapper
) = void_type_node
;
977 /* Prepare calls to builtins to SAVE and RESTORE the stack as well as
978 a temporary through which they communicate. */
981 build_stack_save_restore (tree
*save
, tree
*restore
)
983 tree save_call
, tmp_var
;
986 build_function_call_expr (implicit_built_in_decls
[BUILT_IN_STACK_SAVE
],
988 tmp_var
= create_tmp_var (ptr_type_node
, "saved_stack");
990 *save
= build2 (MODIFY_EXPR
, ptr_type_node
, tmp_var
, save_call
);
992 build_function_call_expr (implicit_built_in_decls
[BUILT_IN_STACK_RESTORE
],
993 tree_cons (NULL_TREE
, tmp_var
, NULL_TREE
));
996 /* Gimplify a BIND_EXPR. Just voidify and recurse. */
998 static enum gimplify_status
999 gimplify_bind_expr (tree
*expr_p
, tree temp
, tree
*pre_p
)
1001 tree bind_expr
= *expr_p
;
1002 bool old_save_stack
= gimplify_ctxp
->save_stack
;
1005 temp
= voidify_wrapper_expr (bind_expr
, temp
);
1007 /* Mark variables seen in this bind expr. */
1008 for (t
= BIND_EXPR_VARS (bind_expr
); t
; t
= TREE_CHAIN (t
))
1010 if (TREE_CODE (t
) == VAR_DECL
)
1011 DECL_SEEN_IN_BIND_EXPR_P (t
) = 1;
1013 /* Preliminarily mark non-addressed complex variables as eligible
1014 for promotion to gimple registers. We'll transform their uses
1016 if (TREE_CODE (TREE_TYPE (t
)) == COMPLEX_TYPE
1017 && !TREE_THIS_VOLATILE (t
)
1018 && (TREE_CODE (t
) == VAR_DECL
&& !DECL_HARD_REGISTER (t
))
1019 && !needs_to_live_in_memory (t
))
1020 DECL_COMPLEX_GIMPLE_REG_P (t
) = 1;
1023 /* Mark variables seen in this bind expr as locals. */
1024 if (gimplify_omp_ctxp
)
1026 struct gimplify_omp_ctx
*ctx
= gimplify_omp_ctxp
;
1028 for (t
= BIND_EXPR_VARS (bind_expr
); t
; t
= TREE_CHAIN (t
))
1029 if (TREE_CODE (t
) == VAR_DECL
&& !is_global_var (t
))
1030 omp_add_variable (ctx
, t
, GOVD_LOCAL
| GOVD_SEEN
);
1033 gimple_push_bind_expr (bind_expr
);
1034 gimplify_ctxp
->save_stack
= false;
1036 gimplify_to_stmt_list (&BIND_EXPR_BODY (bind_expr
));
1038 if (gimplify_ctxp
->save_stack
)
1040 tree stack_save
, stack_restore
;
1042 /* Save stack on entry and restore it on exit. Add a try_finally
1043 block to achieve this. Note that mudflap depends on the
1044 format of the emitted code: see mx_register_decls(). */
1045 build_stack_save_restore (&stack_save
, &stack_restore
);
1047 t
= build2 (TRY_FINALLY_EXPR
, void_type_node
,
1048 BIND_EXPR_BODY (bind_expr
), NULL_TREE
);
1049 append_to_statement_list (stack_restore
, &TREE_OPERAND (t
, 1));
1051 BIND_EXPR_BODY (bind_expr
) = NULL_TREE
;
1052 append_to_statement_list (stack_save
, &BIND_EXPR_BODY (bind_expr
));
1053 append_to_statement_list (t
, &BIND_EXPR_BODY (bind_expr
));
1056 gimplify_ctxp
->save_stack
= old_save_stack
;
1057 gimple_pop_bind_expr ();
1062 append_to_statement_list (bind_expr
, pre_p
);
1069 /* Gimplify a RETURN_EXPR. If the expression to be returned is not a
1070 GIMPLE value, it is assigned to a new temporary and the statement is
1071 re-written to return the temporary.
1073 PRE_P points to the list where side effects that must happen before
1074 STMT should be stored. */
1076 static enum gimplify_status
1077 gimplify_return_expr (tree stmt
, tree
*pre_p
)
1079 tree ret_expr
= TREE_OPERAND (stmt
, 0);
1080 tree result_decl
, result
;
1082 if (!ret_expr
|| TREE_CODE (ret_expr
) == RESULT_DECL
1083 || ret_expr
== error_mark_node
)
1086 if (VOID_TYPE_P (TREE_TYPE (TREE_TYPE (current_function_decl
))))
1087 result_decl
= NULL_TREE
;
1090 result_decl
= TREE_OPERAND (ret_expr
, 0);
1091 if (TREE_CODE (result_decl
) == INDIRECT_REF
)
1092 /* See through a return by reference. */
1093 result_decl
= TREE_OPERAND (result_decl
, 0);
1095 gcc_assert ((TREE_CODE (ret_expr
) == MODIFY_EXPR
1096 || TREE_CODE (ret_expr
) == INIT_EXPR
)
1097 && TREE_CODE (result_decl
) == RESULT_DECL
);
1100 /* If aggregate_value_p is true, then we can return the bare RESULT_DECL.
1101 Recall that aggregate_value_p is FALSE for any aggregate type that is
1102 returned in registers. If we're returning values in registers, then
1103 we don't want to extend the lifetime of the RESULT_DECL, particularly
1104 across another call. In addition, for those aggregates for which
1105 hard_function_value generates a PARALLEL, we'll die during normal
1106 expansion of structure assignments; there's special code in expand_return
1107 to handle this case that does not exist in expand_expr. */
1109 || aggregate_value_p (result_decl
, TREE_TYPE (current_function_decl
)))
1110 result
= result_decl
;
1111 else if (gimplify_ctxp
->return_temp
)
1112 result
= gimplify_ctxp
->return_temp
;
1115 result
= create_tmp_var (TREE_TYPE (result_decl
), NULL
);
1117 /* ??? With complex control flow (usually involving abnormal edges),
1118 we can wind up warning about an uninitialized value for this. Due
1119 to how this variable is constructed and initialized, this is never
1120 true. Give up and never warn. */
1121 TREE_NO_WARNING (result
) = 1;
1123 gimplify_ctxp
->return_temp
= result
;
1126 /* Smash the lhs of the MODIFY_EXPR to the temporary we plan to use.
1127 Then gimplify the whole thing. */
1128 if (result
!= result_decl
)
1129 TREE_OPERAND (ret_expr
, 0) = result
;
1131 gimplify_and_add (TREE_OPERAND (stmt
, 0), pre_p
);
1133 /* If we didn't use a temporary, then the result is just the result_decl.
1134 Otherwise we need a simple copy. This should already be gimple. */
1135 if (result
== result_decl
)
1138 ret_expr
= build2 (MODIFY_EXPR
, TREE_TYPE (result
), result_decl
, result
);
1139 TREE_OPERAND (stmt
, 0) = ret_expr
;
1144 /* Gimplifies a DECL_EXPR node *STMT_P by making any necessary allocation
1145 and initialization explicit. */
1147 static enum gimplify_status
1148 gimplify_decl_expr (tree
*stmt_p
)
1150 tree stmt
= *stmt_p
;
1151 tree decl
= DECL_EXPR_DECL (stmt
);
1153 *stmt_p
= NULL_TREE
;
1155 if (TREE_TYPE (decl
) == error_mark_node
)
1158 if ((TREE_CODE (decl
) == TYPE_DECL
1159 || TREE_CODE (decl
) == VAR_DECL
)
1160 && !TYPE_SIZES_GIMPLIFIED (TREE_TYPE (decl
)))
1161 gimplify_type_sizes (TREE_TYPE (decl
), stmt_p
);
1163 if (TREE_CODE (decl
) == VAR_DECL
&& !DECL_EXTERNAL (decl
))
1165 tree init
= DECL_INITIAL (decl
);
1167 if (!TREE_CONSTANT (DECL_SIZE (decl
)))
1169 /* This is a variable-sized decl. Simplify its size and mark it
1170 for deferred expansion. Note that mudflap depends on the format
1171 of the emitted code: see mx_register_decls(). */
1172 tree t
, args
, addr
, ptr_type
;
1174 gimplify_one_sizepos (&DECL_SIZE (decl
), stmt_p
);
1175 gimplify_one_sizepos (&DECL_SIZE_UNIT (decl
), stmt_p
);
1177 /* All occurrences of this decl in final gimplified code will be
1178 replaced by indirection. Setting DECL_VALUE_EXPR does two
1179 things: First, it lets the rest of the gimplifier know what
1180 replacement to use. Second, it lets the debug info know
1181 where to find the value. */
1182 ptr_type
= build_pointer_type (TREE_TYPE (decl
));
1183 addr
= create_tmp_var (ptr_type
, get_name (decl
));
1184 DECL_IGNORED_P (addr
) = 0;
1185 t
= build_fold_indirect_ref (addr
);
1186 SET_DECL_VALUE_EXPR (decl
, t
);
1187 DECL_HAS_VALUE_EXPR_P (decl
) = 1;
1189 args
= tree_cons (NULL
, DECL_SIZE_UNIT (decl
), NULL
);
1190 t
= built_in_decls
[BUILT_IN_ALLOCA
];
1191 t
= build_function_call_expr (t
, args
);
1192 t
= fold_convert (ptr_type
, t
);
1193 t
= build2 (MODIFY_EXPR
, void_type_node
, addr
, t
);
1195 gimplify_and_add (t
, stmt_p
);
1197 /* Indicate that we need to restore the stack level when the
1198 enclosing BIND_EXPR is exited. */
1199 gimplify_ctxp
->save_stack
= true;
1202 if (init
&& init
!= error_mark_node
)
1204 if (!TREE_STATIC (decl
))
1206 DECL_INITIAL (decl
) = NULL_TREE
;
1207 init
= build2 (MODIFY_EXPR
, void_type_node
, decl
, init
);
1208 gimplify_and_add (init
, stmt_p
);
1211 /* We must still examine initializers for static variables
1212 as they may contain a label address. */
1213 walk_tree (&init
, force_labels_r
, NULL
, NULL
);
1216 /* This decl isn't mentioned in the enclosing block, so add it to the
1217 list of temps. FIXME it seems a bit of a kludge to say that
1218 anonymous artificial vars aren't pushed, but everything else is. */
1219 if (DECL_ARTIFICIAL (decl
) && DECL_NAME (decl
) == NULL_TREE
)
1220 gimple_add_tmp_var (decl
);
1226 /* Gimplify a LOOP_EXPR. Normally this just involves gimplifying the body
1227 and replacing the LOOP_EXPR with goto, but if the loop contains an
1228 EXIT_EXPR, we need to append a label for it to jump to. */
1230 static enum gimplify_status
1231 gimplify_loop_expr (tree
*expr_p
, tree
*pre_p
)
1233 tree saved_label
= gimplify_ctxp
->exit_label
;
1234 tree start_label
= build1 (LABEL_EXPR
, void_type_node
, NULL_TREE
);
1235 tree jump_stmt
= build_and_jump (&LABEL_EXPR_LABEL (start_label
));
1237 append_to_statement_list (start_label
, pre_p
);
1239 gimplify_ctxp
->exit_label
= NULL_TREE
;
1241 gimplify_and_add (LOOP_EXPR_BODY (*expr_p
), pre_p
);
1243 if (gimplify_ctxp
->exit_label
)
1245 append_to_statement_list (jump_stmt
, pre_p
);
1246 *expr_p
= build1 (LABEL_EXPR
, void_type_node
, gimplify_ctxp
->exit_label
);
1249 *expr_p
= jump_stmt
;
1251 gimplify_ctxp
->exit_label
= saved_label
;
1256 /* Compare two case labels. Because the front end should already have
1257 made sure that case ranges do not overlap, it is enough to only compare
1258 the CASE_LOW values of each case label. */
1261 compare_case_labels (const void *p1
, const void *p2
)
1263 tree case1
= *(tree
*)p1
;
1264 tree case2
= *(tree
*)p2
;
1266 return tree_int_cst_compare (CASE_LOW (case1
), CASE_LOW (case2
));
1269 /* Sort the case labels in LABEL_VEC in place in ascending order. */
1272 sort_case_labels (tree label_vec
)
1274 size_t len
= TREE_VEC_LENGTH (label_vec
);
1275 tree default_case
= TREE_VEC_ELT (label_vec
, len
- 1);
1277 if (CASE_LOW (default_case
))
1281 /* The last label in the vector should be the default case
1283 for (i
= 0; i
< len
; ++i
)
1285 tree t
= TREE_VEC_ELT (label_vec
, i
);
1289 TREE_VEC_ELT (label_vec
, i
) = TREE_VEC_ELT (label_vec
, len
- 1);
1290 TREE_VEC_ELT (label_vec
, len
- 1) = default_case
;
1296 qsort (&TREE_VEC_ELT (label_vec
, 0), len
- 1, sizeof (tree
),
1297 compare_case_labels
);
1300 /* Gimplify a SWITCH_EXPR, and collect a TREE_VEC of the labels it can
1303 static enum gimplify_status
1304 gimplify_switch_expr (tree
*expr_p
, tree
*pre_p
)
1306 tree switch_expr
= *expr_p
;
1307 enum gimplify_status ret
;
1309 ret
= gimplify_expr (&SWITCH_COND (switch_expr
), pre_p
, NULL
,
1310 is_gimple_val
, fb_rvalue
);
1312 if (SWITCH_BODY (switch_expr
))
1314 VEC(tree
,heap
) *labels
, *saved_labels
;
1315 tree label_vec
, default_case
= NULL_TREE
;
1318 /* If someone can be bothered to fill in the labels, they can
1319 be bothered to null out the body too. */
1320 gcc_assert (!SWITCH_LABELS (switch_expr
));
1322 saved_labels
= gimplify_ctxp
->case_labels
;
1323 gimplify_ctxp
->case_labels
= VEC_alloc (tree
, heap
, 8);
1325 gimplify_to_stmt_list (&SWITCH_BODY (switch_expr
));
1327 labels
= gimplify_ctxp
->case_labels
;
1328 gimplify_ctxp
->case_labels
= saved_labels
;
1330 len
= VEC_length (tree
, labels
);
1332 for (i
= 0; i
< len
; ++i
)
1334 tree t
= VEC_index (tree
, labels
, i
);
1337 /* The default case must be the last label in the list. */
1339 VEC_replace (tree
, labels
, i
, VEC_index (tree
, labels
, len
- 1));
1345 label_vec
= make_tree_vec (len
+ 1);
1346 SWITCH_LABELS (*expr_p
) = label_vec
;
1347 append_to_statement_list (switch_expr
, pre_p
);
1351 /* If the switch has no default label, add one, so that we jump
1352 around the switch body. */
1353 default_case
= build3 (CASE_LABEL_EXPR
, void_type_node
, NULL_TREE
,
1354 NULL_TREE
, create_artificial_label ());
1355 append_to_statement_list (SWITCH_BODY (switch_expr
), pre_p
);
1356 *expr_p
= build1 (LABEL_EXPR
, void_type_node
,
1357 CASE_LABEL (default_case
));
1360 *expr_p
= SWITCH_BODY (switch_expr
);
1362 for (i
= 0; i
< len
; ++i
)
1363 TREE_VEC_ELT (label_vec
, i
) = VEC_index (tree
, labels
, i
);
1364 TREE_VEC_ELT (label_vec
, len
) = default_case
;
1366 VEC_free (tree
, heap
, labels
);
1368 sort_case_labels (label_vec
);
1370 SWITCH_BODY (switch_expr
) = NULL
;
1373 gcc_assert (SWITCH_LABELS (switch_expr
));
1378 static enum gimplify_status
1379 gimplify_case_label_expr (tree
*expr_p
)
1381 tree expr
= *expr_p
;
1382 struct gimplify_ctx
*ctxp
;
1384 /* Invalid OpenMP programs can play Duff's Device type games with
1385 #pragma omp parallel. At least in the C front end, we don't
1386 detect such invalid branches until after gimplification. */
1387 for (ctxp
= gimplify_ctxp
; ; ctxp
= ctxp
->prev_context
)
1388 if (ctxp
->case_labels
)
1391 VEC_safe_push (tree
, heap
, ctxp
->case_labels
, expr
);
1392 *expr_p
= build1 (LABEL_EXPR
, void_type_node
, CASE_LABEL (expr
));
1396 /* Build a GOTO to the LABEL_DECL pointed to by LABEL_P, building it first
1400 build_and_jump (tree
*label_p
)
1402 if (label_p
== NULL
)
1403 /* If there's nowhere to jump, just fall through. */
1406 if (*label_p
== NULL_TREE
)
1408 tree label
= create_artificial_label ();
1412 return build1 (GOTO_EXPR
, void_type_node
, *label_p
);
1415 /* Gimplify an EXIT_EXPR by converting to a GOTO_EXPR inside a COND_EXPR.
1416 This also involves building a label to jump to and communicating it to
1417 gimplify_loop_expr through gimplify_ctxp->exit_label. */
1419 static enum gimplify_status
1420 gimplify_exit_expr (tree
*expr_p
)
1422 tree cond
= TREE_OPERAND (*expr_p
, 0);
1425 expr
= build_and_jump (&gimplify_ctxp
->exit_label
);
1426 expr
= build3 (COND_EXPR
, void_type_node
, cond
, expr
, NULL_TREE
);
1432 /* A helper function to be called via walk_tree. Mark all labels under *TP
1433 as being forced. To be called for DECL_INITIAL of static variables. */
1436 force_labels_r (tree
*tp
, int *walk_subtrees
, void *data ATTRIBUTE_UNUSED
)
1440 if (TREE_CODE (*tp
) == LABEL_DECL
)
1441 FORCED_LABEL (*tp
) = 1;
1446 /* *EXPR_P is a COMPONENT_REF being used as an rvalue. If its type is
1447 different from its canonical type, wrap the whole thing inside a
1448 NOP_EXPR and force the type of the COMPONENT_REF to be the canonical
1451 The canonical type of a COMPONENT_REF is the type of the field being
1452 referenced--unless the field is a bit-field which can be read directly
1453 in a smaller mode, in which case the canonical type is the
1454 sign-appropriate type corresponding to that mode. */
1457 canonicalize_component_ref (tree
*expr_p
)
1459 tree expr
= *expr_p
;
1462 gcc_assert (TREE_CODE (expr
) == COMPONENT_REF
);
1464 if (INTEGRAL_TYPE_P (TREE_TYPE (expr
)))
1465 type
= TREE_TYPE (get_unwidened (expr
, NULL_TREE
));
1467 type
= TREE_TYPE (TREE_OPERAND (expr
, 1));
1469 if (TREE_TYPE (expr
) != type
)
1471 tree old_type
= TREE_TYPE (expr
);
1473 /* Set the type of the COMPONENT_REF to the underlying type. */
1474 TREE_TYPE (expr
) = type
;
1476 /* And wrap the whole thing inside a NOP_EXPR. */
1477 expr
= build1 (NOP_EXPR
, old_type
, expr
);
1483 /* If a NOP conversion is changing a pointer to array of foo to a pointer
1484 to foo, embed that change in the ADDR_EXPR by converting
1489 where L is the lower bound. For simplicity, only do this for constant
1493 canonicalize_addr_expr (tree
*expr_p
)
1495 tree expr
= *expr_p
;
1496 tree ctype
= TREE_TYPE (expr
);
1497 tree addr_expr
= TREE_OPERAND (expr
, 0);
1498 tree atype
= TREE_TYPE (addr_expr
);
1499 tree dctype
, datype
, ddatype
, otype
, obj_expr
;
1501 /* Both cast and addr_expr types should be pointers. */
1502 if (!POINTER_TYPE_P (ctype
) || !POINTER_TYPE_P (atype
))
1505 /* The addr_expr type should be a pointer to an array. */
1506 datype
= TREE_TYPE (atype
);
1507 if (TREE_CODE (datype
) != ARRAY_TYPE
)
1510 /* Both cast and addr_expr types should address the same object type. */
1511 dctype
= TREE_TYPE (ctype
);
1512 ddatype
= TREE_TYPE (datype
);
1513 if (!lang_hooks
.types_compatible_p (ddatype
, dctype
))
1516 /* The addr_expr and the object type should match. */
1517 obj_expr
= TREE_OPERAND (addr_expr
, 0);
1518 otype
= TREE_TYPE (obj_expr
);
1519 if (!lang_hooks
.types_compatible_p (otype
, datype
))
1522 /* The lower bound and element sizes must be constant. */
1523 if (!TYPE_SIZE_UNIT (dctype
)
1524 || TREE_CODE (TYPE_SIZE_UNIT (dctype
)) != INTEGER_CST
1525 || !TYPE_DOMAIN (datype
) || !TYPE_MIN_VALUE (TYPE_DOMAIN (datype
))
1526 || TREE_CODE (TYPE_MIN_VALUE (TYPE_DOMAIN (datype
))) != INTEGER_CST
)
1529 /* All checks succeeded. Build a new node to merge the cast. */
1530 *expr_p
= build4 (ARRAY_REF
, dctype
, obj_expr
,
1531 TYPE_MIN_VALUE (TYPE_DOMAIN (datype
)),
1532 TYPE_MIN_VALUE (TYPE_DOMAIN (datype
)),
1533 size_binop (EXACT_DIV_EXPR
, TYPE_SIZE_UNIT (dctype
),
1534 size_int (TYPE_ALIGN_UNIT (dctype
))));
1535 *expr_p
= build1 (ADDR_EXPR
, ctype
, *expr_p
);
1538 /* *EXPR_P is a NOP_EXPR or CONVERT_EXPR. Remove it and/or other conversions
1539 underneath as appropriate. */
1541 static enum gimplify_status
1542 gimplify_conversion (tree
*expr_p
)
1544 gcc_assert (TREE_CODE (*expr_p
) == NOP_EXPR
1545 || TREE_CODE (*expr_p
) == CONVERT_EXPR
);
1547 /* Then strip away all but the outermost conversion. */
1548 STRIP_SIGN_NOPS (TREE_OPERAND (*expr_p
, 0));
1550 /* And remove the outermost conversion if it's useless. */
1551 if (tree_ssa_useless_type_conversion (*expr_p
))
1552 *expr_p
= TREE_OPERAND (*expr_p
, 0);
1554 /* If we still have a conversion at the toplevel,
1555 then canonicalize some constructs. */
1556 if (TREE_CODE (*expr_p
) == NOP_EXPR
|| TREE_CODE (*expr_p
) == CONVERT_EXPR
)
1558 tree sub
= TREE_OPERAND (*expr_p
, 0);
1560 /* If a NOP conversion is changing the type of a COMPONENT_REF
1561 expression, then canonicalize its type now in order to expose more
1562 redundant conversions. */
1563 if (TREE_CODE (sub
) == COMPONENT_REF
)
1564 canonicalize_component_ref (&TREE_OPERAND (*expr_p
, 0));
1566 /* If a NOP conversion is changing a pointer to array of foo
1567 to a pointer to foo, embed that change in the ADDR_EXPR. */
1568 else if (TREE_CODE (sub
) == ADDR_EXPR
)
1569 canonicalize_addr_expr (expr_p
);
1575 /* Gimplify a VAR_DECL or PARM_DECL. Returns GS_OK if we expanded a
1576 DECL_VALUE_EXPR, and it's worth re-examining things. */
1578 static enum gimplify_status
1579 gimplify_var_or_parm_decl (tree
*expr_p
)
1581 tree decl
= *expr_p
;
1583 /* ??? If this is a local variable, and it has not been seen in any
1584 outer BIND_EXPR, then it's probably the result of a duplicate
1585 declaration, for which we've already issued an error. It would
1586 be really nice if the front end wouldn't leak these at all.
1587 Currently the only known culprit is C++ destructors, as seen
1588 in g++.old-deja/g++.jason/binding.C. */
1589 if (TREE_CODE (decl
) == VAR_DECL
1590 && !DECL_SEEN_IN_BIND_EXPR_P (decl
)
1591 && !TREE_STATIC (decl
) && !DECL_EXTERNAL (decl
)
1592 && decl_function_context (decl
) == current_function_decl
)
1594 gcc_assert (errorcount
|| sorrycount
);
1598 /* When within an OpenMP context, notice uses of variables. */
1599 if (gimplify_omp_ctxp
&& omp_notice_variable (gimplify_omp_ctxp
, decl
, true))
1602 /* If the decl is an alias for another expression, substitute it now. */
1603 if (DECL_HAS_VALUE_EXPR_P (decl
))
1605 *expr_p
= unshare_expr (DECL_VALUE_EXPR (decl
));
1613 /* Gimplify the COMPONENT_REF, ARRAY_REF, REALPART_EXPR or IMAGPART_EXPR
1614 node pointed to by EXPR_P.
1617 : min_lval '[' val ']'
1619 | compound_lval '[' val ']'
1620 | compound_lval '.' ID
1622 This is not part of the original SIMPLE definition, which separates
1623 array and member references, but it seems reasonable to handle them
1624 together. Also, this way we don't run into problems with union
1625 aliasing; gcc requires that for accesses through a union to alias, the
1626 union reference must be explicit, which was not always the case when we
1627 were splitting up array and member refs.
1629 PRE_P points to the list where side effects that must happen before
1630 *EXPR_P should be stored.
1632 POST_P points to the list where side effects that must happen after
1633 *EXPR_P should be stored. */
1635 static enum gimplify_status
1636 gimplify_compound_lval (tree
*expr_p
, tree
*pre_p
,
1637 tree
*post_p
, fallback_t fallback
)
1640 VEC(tree
,heap
) *stack
;
1641 enum gimplify_status ret
= GS_OK
, tret
;
1644 /* Create a stack of the subexpressions so later we can walk them in
1645 order from inner to outer. */
1646 stack
= VEC_alloc (tree
, heap
, 10);
1648 /* We can handle anything that get_inner_reference can deal with. */
1649 for (p
= expr_p
; ; p
= &TREE_OPERAND (*p
, 0))
1652 /* Fold INDIRECT_REFs now to turn them into ARRAY_REFs. */
1653 if (TREE_CODE (*p
) == INDIRECT_REF
)
1654 *p
= fold_indirect_ref (*p
);
1656 if (handled_component_p (*p
))
1658 /* Expand DECL_VALUE_EXPR now. In some cases that may expose
1659 additional COMPONENT_REFs. */
1660 else if ((TREE_CODE (*p
) == VAR_DECL
|| TREE_CODE (*p
) == PARM_DECL
)
1661 && gimplify_var_or_parm_decl (p
) == GS_OK
)
1666 VEC_safe_push (tree
, heap
, stack
, *p
);
1669 gcc_assert (VEC_length (tree
, stack
));
1671 /* Now STACK is a stack of pointers to all the refs we've walked through
1672 and P points to the innermost expression.
1674 Java requires that we elaborated nodes in source order. That
1675 means we must gimplify the inner expression followed by each of
1676 the indices, in order. But we can't gimplify the inner
1677 expression until we deal with any variable bounds, sizes, or
1678 positions in order to deal with PLACEHOLDER_EXPRs.
1680 So we do this in three steps. First we deal with the annotations
1681 for any variables in the components, then we gimplify the base,
1682 then we gimplify any indices, from left to right. */
1683 for (i
= VEC_length (tree
, stack
) - 1; i
>= 0; i
--)
1685 tree t
= VEC_index (tree
, stack
, i
);
1687 if (TREE_CODE (t
) == ARRAY_REF
|| TREE_CODE (t
) == ARRAY_RANGE_REF
)
1689 /* Gimplify the low bound and element type size and put them into
1690 the ARRAY_REF. If these values are set, they have already been
1692 if (!TREE_OPERAND (t
, 2))
1694 tree low
= unshare_expr (array_ref_low_bound (t
));
1695 if (!is_gimple_min_invariant (low
))
1697 TREE_OPERAND (t
, 2) = low
;
1698 tret
= gimplify_expr (&TREE_OPERAND (t
, 2), pre_p
, post_p
,
1699 is_gimple_formal_tmp_reg
, fb_rvalue
);
1700 ret
= MIN (ret
, tret
);
1704 if (!TREE_OPERAND (t
, 3))
1706 tree elmt_type
= TREE_TYPE (TREE_TYPE (TREE_OPERAND (t
, 0)));
1707 tree elmt_size
= unshare_expr (array_ref_element_size (t
));
1708 tree factor
= size_int (TYPE_ALIGN_UNIT (elmt_type
));
1710 /* Divide the element size by the alignment of the element
1712 elmt_size
= size_binop (EXACT_DIV_EXPR
, elmt_size
, factor
);
1714 if (!is_gimple_min_invariant (elmt_size
))
1716 TREE_OPERAND (t
, 3) = elmt_size
;
1717 tret
= gimplify_expr (&TREE_OPERAND (t
, 3), pre_p
, post_p
,
1718 is_gimple_formal_tmp_reg
, fb_rvalue
);
1719 ret
= MIN (ret
, tret
);
1723 else if (TREE_CODE (t
) == COMPONENT_REF
)
1725 /* Set the field offset into T and gimplify it. */
1726 if (!TREE_OPERAND (t
, 2))
1728 tree offset
= unshare_expr (component_ref_field_offset (t
));
1729 tree field
= TREE_OPERAND (t
, 1);
1731 = size_int (DECL_OFFSET_ALIGN (field
) / BITS_PER_UNIT
);
1733 /* Divide the offset by its alignment. */
1734 offset
= size_binop (EXACT_DIV_EXPR
, offset
, factor
);
1736 if (!is_gimple_min_invariant (offset
))
1738 TREE_OPERAND (t
, 2) = offset
;
1739 tret
= gimplify_expr (&TREE_OPERAND (t
, 2), pre_p
, post_p
,
1740 is_gimple_formal_tmp_reg
, fb_rvalue
);
1741 ret
= MIN (ret
, tret
);
1747 /* Step 2 is to gimplify the base expression. Make sure lvalue is set
1748 so as to match the min_lval predicate. Failure to do so may result
1749 in the creation of large aggregate temporaries. */
1750 tret
= gimplify_expr (p
, pre_p
, post_p
, is_gimple_min_lval
,
1751 fallback
| fb_lvalue
);
1752 ret
= MIN (ret
, tret
);
1754 /* And finally, the indices and operands to BIT_FIELD_REF. During this
1755 loop we also remove any useless conversions. */
1756 for (; VEC_length (tree
, stack
) > 0; )
1758 tree t
= VEC_pop (tree
, stack
);
1760 if (TREE_CODE (t
) == ARRAY_REF
|| TREE_CODE (t
) == ARRAY_RANGE_REF
)
1762 /* Gimplify the dimension.
1763 Temporary fix for gcc.c-torture/execute/20040313-1.c.
1764 Gimplify non-constant array indices into a temporary
1766 FIXME - The real fix is to gimplify post-modify
1767 expressions into a minimal gimple lvalue. However, that
1768 exposes bugs in alias analysis. The alias analyzer does
1769 not handle &PTR->FIELD very well. Will fix after the
1770 branch is merged into mainline (dnovillo 2004-05-03). */
1771 if (!is_gimple_min_invariant (TREE_OPERAND (t
, 1)))
1773 tret
= gimplify_expr (&TREE_OPERAND (t
, 1), pre_p
, post_p
,
1774 is_gimple_formal_tmp_reg
, fb_rvalue
);
1775 ret
= MIN (ret
, tret
);
1778 else if (TREE_CODE (t
) == BIT_FIELD_REF
)
1780 tret
= gimplify_expr (&TREE_OPERAND (t
, 1), pre_p
, post_p
,
1781 is_gimple_val
, fb_rvalue
);
1782 ret
= MIN (ret
, tret
);
1783 tret
= gimplify_expr (&TREE_OPERAND (t
, 2), pre_p
, post_p
,
1784 is_gimple_val
, fb_rvalue
);
1785 ret
= MIN (ret
, tret
);
1788 STRIP_USELESS_TYPE_CONVERSION (TREE_OPERAND (t
, 0));
1790 /* The innermost expression P may have originally had TREE_SIDE_EFFECTS
1791 set which would have caused all the outer expressions in EXPR_P
1792 leading to P to also have had TREE_SIDE_EFFECTS set. */
1793 recalculate_side_effects (t
);
1796 tret
= gimplify_expr (p
, pre_p
, post_p
, is_gimple_min_lval
, fallback
);
1797 ret
= MIN (ret
, tret
);
1799 /* If the outermost expression is a COMPONENT_REF, canonicalize its type. */
1800 if ((fallback
& fb_rvalue
) && TREE_CODE (*expr_p
) == COMPONENT_REF
)
1802 canonicalize_component_ref (expr_p
);
1803 ret
= MIN (ret
, GS_OK
);
1806 VEC_free (tree
, heap
, stack
);
1811 /* Gimplify the self modifying expression pointed to by EXPR_P
1814 PRE_P points to the list where side effects that must happen before
1815 *EXPR_P should be stored.
1817 POST_P points to the list where side effects that must happen after
1818 *EXPR_P should be stored.
1820 WANT_VALUE is nonzero iff we want to use the value of this expression
1821 in another expression. */
1823 static enum gimplify_status
1824 gimplify_self_mod_expr (tree
*expr_p
, tree
*pre_p
, tree
*post_p
,
1827 enum tree_code code
;
1828 tree lhs
, lvalue
, rhs
, t1
;
1830 enum tree_code arith_code
;
1831 enum gimplify_status ret
;
1833 code
= TREE_CODE (*expr_p
);
1835 gcc_assert (code
== POSTINCREMENT_EXPR
|| code
== POSTDECREMENT_EXPR
1836 || code
== PREINCREMENT_EXPR
|| code
== PREDECREMENT_EXPR
);
1838 /* Prefix or postfix? */
1839 if (code
== POSTINCREMENT_EXPR
|| code
== POSTDECREMENT_EXPR
)
1840 /* Faster to treat as prefix if result is not used. */
1841 postfix
= want_value
;
1845 /* Add or subtract? */
1846 if (code
== PREINCREMENT_EXPR
|| code
== POSTINCREMENT_EXPR
)
1847 arith_code
= PLUS_EXPR
;
1849 arith_code
= MINUS_EXPR
;
1851 /* Gimplify the LHS into a GIMPLE lvalue. */
1852 lvalue
= TREE_OPERAND (*expr_p
, 0);
1853 ret
= gimplify_expr (&lvalue
, pre_p
, post_p
, is_gimple_lvalue
, fb_lvalue
);
1854 if (ret
== GS_ERROR
)
1857 /* Extract the operands to the arithmetic operation. */
1859 rhs
= TREE_OPERAND (*expr_p
, 1);
1861 /* For postfix operator, we evaluate the LHS to an rvalue and then use
1862 that as the result value and in the postqueue operation. */
1865 ret
= gimplify_expr (&lhs
, pre_p
, post_p
, is_gimple_val
, fb_rvalue
);
1866 if (ret
== GS_ERROR
)
1870 t1
= build2 (arith_code
, TREE_TYPE (*expr_p
), lhs
, rhs
);
1871 t1
= build2 (MODIFY_EXPR
, TREE_TYPE (lvalue
), lvalue
, t1
);
1875 gimplify_and_add (t1
, post_p
);
1886 /* If *EXPR_P has a variable sized type, wrap it in a WITH_SIZE_EXPR. */
1889 maybe_with_size_expr (tree
*expr_p
)
1891 tree expr
= *expr_p
;
1892 tree type
= TREE_TYPE (expr
);
1895 /* If we've already wrapped this or the type is error_mark_node, we can't do
1897 if (TREE_CODE (expr
) == WITH_SIZE_EXPR
1898 || type
== error_mark_node
)
1901 /* If the size isn't known or is a constant, we have nothing to do. */
1902 size
= TYPE_SIZE_UNIT (type
);
1903 if (!size
|| TREE_CODE (size
) == INTEGER_CST
)
1906 /* Otherwise, make a WITH_SIZE_EXPR. */
1907 size
= unshare_expr (size
);
1908 size
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (size
, expr
);
1909 *expr_p
= build2 (WITH_SIZE_EXPR
, type
, expr
, size
);
1912 /* Subroutine of gimplify_call_expr: Gimplify a single argument. */
1914 static enum gimplify_status
1915 gimplify_arg (tree
*expr_p
, tree
*pre_p
)
1917 bool (*test
) (tree
);
1920 /* In general, we allow lvalues for function arguments to avoid
1921 extra overhead of copying large aggregates out of even larger
1922 aggregates into temporaries only to copy the temporaries to
1923 the argument list. Make optimizers happy by pulling out to
1924 temporaries those types that fit in registers. */
1925 if (is_gimple_reg_type (TREE_TYPE (*expr_p
)))
1926 test
= is_gimple_val
, fb
= fb_rvalue
;
1928 test
= is_gimple_lvalue
, fb
= fb_either
;
1930 /* If this is a variable sized type, we must remember the size. */
1931 maybe_with_size_expr (expr_p
);
1933 /* There is a sequence point before a function call. Side effects in
1934 the argument list must occur before the actual call. So, when
1935 gimplifying arguments, force gimplify_expr to use an internal
1936 post queue which is then appended to the end of PRE_P. */
1937 return gimplify_expr (expr_p
, pre_p
, NULL
, test
, fb
);
1940 /* Gimplify the CALL_EXPR node pointed to by EXPR_P. PRE_P points to the
1941 list where side effects that must happen before *EXPR_P should be stored.
1942 WANT_VALUE is true if the result of the call is desired. */
1944 static enum gimplify_status
1945 gimplify_call_expr (tree
*expr_p
, tree
*pre_p
, bool want_value
)
1949 enum gimplify_status ret
;
1951 gcc_assert (TREE_CODE (*expr_p
) == CALL_EXPR
);
1953 /* For reliable diagnostics during inlining, it is necessary that
1954 every call_expr be annotated with file and line. */
1955 if (! EXPR_HAS_LOCATION (*expr_p
))
1956 SET_EXPR_LOCATION (*expr_p
, input_location
);
1958 /* This may be a call to a builtin function.
1960 Builtin function calls may be transformed into different
1961 (and more efficient) builtin function calls under certain
1962 circumstances. Unfortunately, gimplification can muck things
1963 up enough that the builtin expanders are not aware that certain
1964 transformations are still valid.
1966 So we attempt transformation/gimplification of the call before
1967 we gimplify the CALL_EXPR. At this time we do not manage to
1968 transform all calls in the same manner as the expanders do, but
1969 we do transform most of them. */
1970 decl
= get_callee_fndecl (*expr_p
);
1971 if (decl
&& DECL_BUILT_IN (decl
))
1973 tree fndecl
= get_callee_fndecl (*expr_p
);
1974 tree arglist
= TREE_OPERAND (*expr_p
, 1);
1975 tree
new = fold_builtin (fndecl
, arglist
, !want_value
);
1977 if (new && new != *expr_p
)
1979 /* There was a transformation of this call which computes the
1980 same value, but in a more efficient way. Return and try
1986 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
1987 && DECL_FUNCTION_CODE (decl
) == BUILT_IN_VA_START
)
1989 if (!arglist
|| !TREE_CHAIN (arglist
))
1991 error ("too few arguments to function %<va_start%>");
1992 *expr_p
= build_empty_stmt ();
1996 if (fold_builtin_next_arg (TREE_CHAIN (arglist
)))
1998 *expr_p
= build_empty_stmt ();
2001 /* Avoid gimplifying the second argument to va_start, which needs
2002 to be the plain PARM_DECL. */
2003 return gimplify_arg (&TREE_VALUE (TREE_OPERAND (*expr_p
, 1)), pre_p
);
2007 /* There is a sequence point before the call, so any side effects in
2008 the calling expression must occur before the actual call. Force
2009 gimplify_expr to use an internal post queue. */
2010 ret
= gimplify_expr (&TREE_OPERAND (*expr_p
, 0), pre_p
, NULL
,
2011 is_gimple_call_addr
, fb_rvalue
);
2013 if (PUSH_ARGS_REVERSED
)
2014 TREE_OPERAND (*expr_p
, 1) = nreverse (TREE_OPERAND (*expr_p
, 1));
2015 for (arglist
= TREE_OPERAND (*expr_p
, 1); arglist
;
2016 arglist
= TREE_CHAIN (arglist
))
2018 enum gimplify_status t
;
2020 t
= gimplify_arg (&TREE_VALUE (arglist
), pre_p
);
2025 if (PUSH_ARGS_REVERSED
)
2026 TREE_OPERAND (*expr_p
, 1) = nreverse (TREE_OPERAND (*expr_p
, 1));
2028 /* Try this again in case gimplification exposed something. */
2029 if (ret
!= GS_ERROR
&& decl
&& DECL_BUILT_IN (decl
))
2031 tree fndecl
= get_callee_fndecl (*expr_p
);
2032 tree arglist
= TREE_OPERAND (*expr_p
, 1);
2033 tree
new = fold_builtin (fndecl
, arglist
, !want_value
);
2035 if (new && new != *expr_p
)
2037 /* There was a transformation of this call which computes the
2038 same value, but in a more efficient way. Return and try
2045 /* If the function is "const" or "pure", then clear TREE_SIDE_EFFECTS on its
2046 decl. This allows us to eliminate redundant or useless
2047 calls to "const" functions. */
2048 if (TREE_CODE (*expr_p
) == CALL_EXPR
2049 && (call_expr_flags (*expr_p
) & (ECF_CONST
| ECF_PURE
)))
2050 TREE_SIDE_EFFECTS (*expr_p
) = 0;
2055 /* Handle shortcut semantics in the predicate operand of a COND_EXPR by
2056 rewriting it into multiple COND_EXPRs, and possibly GOTO_EXPRs.
2058 TRUE_LABEL_P and FALSE_LABEL_P point to the labels to jump to if the
2059 condition is true or false, respectively. If null, we should generate
2060 our own to skip over the evaluation of this specific expression.
2062 This function is the tree equivalent of do_jump.
2064 shortcut_cond_r should only be called by shortcut_cond_expr. */
2067 shortcut_cond_r (tree pred
, tree
*true_label_p
, tree
*false_label_p
)
2069 tree local_label
= NULL_TREE
;
2070 tree t
, expr
= NULL
;
2072 /* OK, it's not a simple case; we need to pull apart the COND_EXPR to
2073 retain the shortcut semantics. Just insert the gotos here;
2074 shortcut_cond_expr will append the real blocks later. */
2075 if (TREE_CODE (pred
) == TRUTH_ANDIF_EXPR
)
2077 /* Turn if (a && b) into
2079 if (a); else goto no;
2080 if (b) goto yes; else goto no;
2083 if (false_label_p
== NULL
)
2084 false_label_p
= &local_label
;
2086 t
= shortcut_cond_r (TREE_OPERAND (pred
, 0), NULL
, false_label_p
);
2087 append_to_statement_list (t
, &expr
);
2089 t
= shortcut_cond_r (TREE_OPERAND (pred
, 1), true_label_p
,
2091 append_to_statement_list (t
, &expr
);
2093 else if (TREE_CODE (pred
) == TRUTH_ORIF_EXPR
)
2095 /* Turn if (a || b) into
2098 if (b) goto yes; else goto no;
2101 if (true_label_p
== NULL
)
2102 true_label_p
= &local_label
;
2104 t
= shortcut_cond_r (TREE_OPERAND (pred
, 0), true_label_p
, NULL
);
2105 append_to_statement_list (t
, &expr
);
2107 t
= shortcut_cond_r (TREE_OPERAND (pred
, 1), true_label_p
,
2109 append_to_statement_list (t
, &expr
);
2111 else if (TREE_CODE (pred
) == COND_EXPR
)
2113 /* As long as we're messing with gotos, turn if (a ? b : c) into
2115 if (b) goto yes; else goto no;
2117 if (c) goto yes; else goto no; */
2118 expr
= build3 (COND_EXPR
, void_type_node
, TREE_OPERAND (pred
, 0),
2119 shortcut_cond_r (TREE_OPERAND (pred
, 1), true_label_p
,
2121 shortcut_cond_r (TREE_OPERAND (pred
, 2), true_label_p
,
2126 expr
= build3 (COND_EXPR
, void_type_node
, pred
,
2127 build_and_jump (true_label_p
),
2128 build_and_jump (false_label_p
));
2133 t
= build1 (LABEL_EXPR
, void_type_node
, local_label
);
2134 append_to_statement_list (t
, &expr
);
2141 shortcut_cond_expr (tree expr
)
2143 tree pred
= TREE_OPERAND (expr
, 0);
2144 tree then_
= TREE_OPERAND (expr
, 1);
2145 tree else_
= TREE_OPERAND (expr
, 2);
2146 tree true_label
, false_label
, end_label
, t
;
2148 tree
*false_label_p
;
2149 bool emit_end
, emit_false
, jump_over_else
;
2150 bool then_se
= then_
&& TREE_SIDE_EFFECTS (then_
);
2151 bool else_se
= else_
&& TREE_SIDE_EFFECTS (else_
);
2153 /* First do simple transformations. */
2156 /* If there is no 'else', turn (a && b) into if (a) if (b). */
2157 while (TREE_CODE (pred
) == TRUTH_ANDIF_EXPR
)
2159 TREE_OPERAND (expr
, 0) = TREE_OPERAND (pred
, 1);
2160 then_
= shortcut_cond_expr (expr
);
2161 then_se
= then_
&& TREE_SIDE_EFFECTS (then_
);
2162 pred
= TREE_OPERAND (pred
, 0);
2163 expr
= build3 (COND_EXPR
, void_type_node
, pred
, then_
, NULL_TREE
);
2168 /* If there is no 'then', turn
2171 if (a); else if (b); else d. */
2172 while (TREE_CODE (pred
) == TRUTH_ORIF_EXPR
)
2174 TREE_OPERAND (expr
, 0) = TREE_OPERAND (pred
, 1);
2175 else_
= shortcut_cond_expr (expr
);
2176 else_se
= else_
&& TREE_SIDE_EFFECTS (else_
);
2177 pred
= TREE_OPERAND (pred
, 0);
2178 expr
= build3 (COND_EXPR
, void_type_node
, pred
, NULL_TREE
, else_
);
2182 /* If we're done, great. */
2183 if (TREE_CODE (pred
) != TRUTH_ANDIF_EXPR
2184 && TREE_CODE (pred
) != TRUTH_ORIF_EXPR
)
2187 /* Otherwise we need to mess with gotos. Change
2190 if (a); else goto no;
2193 and recursively gimplify the condition. */
2195 true_label
= false_label
= end_label
= NULL_TREE
;
2197 /* If our arms just jump somewhere, hijack those labels so we don't
2198 generate jumps to jumps. */
2201 && TREE_CODE (then_
) == GOTO_EXPR
2202 && TREE_CODE (GOTO_DESTINATION (then_
)) == LABEL_DECL
)
2204 true_label
= GOTO_DESTINATION (then_
);
2210 && TREE_CODE (else_
) == GOTO_EXPR
2211 && TREE_CODE (GOTO_DESTINATION (else_
)) == LABEL_DECL
)
2213 false_label
= GOTO_DESTINATION (else_
);
2218 /* If we aren't hijacking a label for the 'then' branch, it falls through. */
2220 true_label_p
= &true_label
;
2222 true_label_p
= NULL
;
2224 /* The 'else' branch also needs a label if it contains interesting code. */
2225 if (false_label
|| else_se
)
2226 false_label_p
= &false_label
;
2228 false_label_p
= NULL
;
2230 /* If there was nothing else in our arms, just forward the label(s). */
2231 if (!then_se
&& !else_se
)
2232 return shortcut_cond_r (pred
, true_label_p
, false_label_p
);
2234 /* If our last subexpression already has a terminal label, reuse it. */
2236 expr
= expr_last (else_
);
2238 expr
= expr_last (then_
);
2241 if (expr
&& TREE_CODE (expr
) == LABEL_EXPR
)
2242 end_label
= LABEL_EXPR_LABEL (expr
);
2244 /* If we don't care about jumping to the 'else' branch, jump to the end
2245 if the condition is false. */
2247 false_label_p
= &end_label
;
2249 /* We only want to emit these labels if we aren't hijacking them. */
2250 emit_end
= (end_label
== NULL_TREE
);
2251 emit_false
= (false_label
== NULL_TREE
);
2253 /* We only emit the jump over the else clause if we have to--if the
2254 then clause may fall through. Otherwise we can wind up with a
2255 useless jump and a useless label at the end of gimplified code,
2256 which will cause us to think that this conditional as a whole
2257 falls through even if it doesn't. If we then inline a function
2258 which ends with such a condition, that can cause us to issue an
2259 inappropriate warning about control reaching the end of a
2260 non-void function. */
2261 jump_over_else
= block_may_fallthru (then_
);
2263 pred
= shortcut_cond_r (pred
, true_label_p
, false_label_p
);
2266 append_to_statement_list (pred
, &expr
);
2268 append_to_statement_list (then_
, &expr
);
2273 t
= build_and_jump (&end_label
);
2274 append_to_statement_list (t
, &expr
);
2278 t
= build1 (LABEL_EXPR
, void_type_node
, false_label
);
2279 append_to_statement_list (t
, &expr
);
2281 append_to_statement_list (else_
, &expr
);
2283 if (emit_end
&& end_label
)
2285 t
= build1 (LABEL_EXPR
, void_type_node
, end_label
);
2286 append_to_statement_list (t
, &expr
);
2292 /* EXPR is used in a boolean context; make sure it has BOOLEAN_TYPE. */
2295 gimple_boolify (tree expr
)
2297 tree type
= TREE_TYPE (expr
);
2299 if (TREE_CODE (type
) == BOOLEAN_TYPE
)
2302 switch (TREE_CODE (expr
))
2304 case TRUTH_AND_EXPR
:
2306 case TRUTH_XOR_EXPR
:
2307 case TRUTH_ANDIF_EXPR
:
2308 case TRUTH_ORIF_EXPR
:
2309 /* Also boolify the arguments of truth exprs. */
2310 TREE_OPERAND (expr
, 1) = gimple_boolify (TREE_OPERAND (expr
, 1));
2313 case TRUTH_NOT_EXPR
:
2314 TREE_OPERAND (expr
, 0) = gimple_boolify (TREE_OPERAND (expr
, 0));
2317 case EQ_EXPR
: case NE_EXPR
:
2318 case LE_EXPR
: case GE_EXPR
: case LT_EXPR
: case GT_EXPR
:
2319 /* These expressions always produce boolean results. */
2320 TREE_TYPE (expr
) = boolean_type_node
;
2324 /* Other expressions that get here must have boolean values, but
2325 might need to be converted to the appropriate mode. */
2326 return convert (boolean_type_node
, expr
);
2330 /* Convert the conditional expression pointed to by EXPR_P '(p) ? a : b;'
2339 The second form is used when *EXPR_P is of type void.
2341 TARGET is the tree for T1 above.
2343 PRE_P points to the list where side effects that must happen before
2344 *EXPR_P should be stored.
2346 POST_P points to the list where side effects that must happen after
2347 *EXPR_P should be stored. */
2349 static enum gimplify_status
2350 gimplify_cond_expr (tree
*expr_p
, tree
*pre_p
, tree
*post_p
, tree target
,
2351 fallback_t fallback
)
2353 tree expr
= *expr_p
;
2354 tree tmp
, tmp2
, type
;
2355 enum gimplify_status ret
;
2357 type
= TREE_TYPE (expr
);
2359 /* If this COND_EXPR has a value, copy the values into a temporary within
2361 if (! VOID_TYPE_P (type
))
2367 ret
= gimplify_expr (&target
, pre_p
, post_p
,
2368 is_gimple_min_lval
, fb_lvalue
);
2369 if (ret
!= GS_ERROR
)
2371 result
= tmp
= target
;
2372 tmp2
= unshare_expr (target
);
2374 else if ((fallback
& fb_lvalue
) == 0)
2376 result
= tmp2
= tmp
= create_tmp_var (TREE_TYPE (expr
), "iftmp");
2381 tree type
= build_pointer_type (TREE_TYPE (expr
));
2383 if (TREE_TYPE (TREE_OPERAND (expr
, 1)) != void_type_node
)
2384 TREE_OPERAND (expr
, 1) =
2385 build_fold_addr_expr (TREE_OPERAND (expr
, 1));
2387 if (TREE_TYPE (TREE_OPERAND (expr
, 2)) != void_type_node
)
2388 TREE_OPERAND (expr
, 2) =
2389 build_fold_addr_expr (TREE_OPERAND (expr
, 2));
2391 tmp2
= tmp
= create_tmp_var (type
, "iftmp");
2393 expr
= build3 (COND_EXPR
, void_type_node
, TREE_OPERAND (expr
, 0),
2394 TREE_OPERAND (expr
, 1), TREE_OPERAND (expr
, 2));
2396 result
= build_fold_indirect_ref (tmp
);
2400 /* Build the then clause, 't1 = a;'. But don't build an assignment
2401 if this branch is void; in C++ it can be, if it's a throw. */
2402 if (TREE_TYPE (TREE_OPERAND (expr
, 1)) != void_type_node
)
2403 TREE_OPERAND (expr
, 1)
2404 = build2 (MODIFY_EXPR
, void_type_node
, tmp
, TREE_OPERAND (expr
, 1));
2406 /* Build the else clause, 't1 = b;'. */
2407 if (TREE_TYPE (TREE_OPERAND (expr
, 2)) != void_type_node
)
2408 TREE_OPERAND (expr
, 2)
2409 = build2 (MODIFY_EXPR
, void_type_node
, tmp2
, TREE_OPERAND (expr
, 2));
2411 TREE_TYPE (expr
) = void_type_node
;
2412 recalculate_side_effects (expr
);
2414 /* Move the COND_EXPR to the prequeue. */
2415 gimplify_and_add (expr
, pre_p
);
2421 /* Make sure the condition has BOOLEAN_TYPE. */
2422 TREE_OPERAND (expr
, 0) = gimple_boolify (TREE_OPERAND (expr
, 0));
2424 /* Break apart && and || conditions. */
2425 if (TREE_CODE (TREE_OPERAND (expr
, 0)) == TRUTH_ANDIF_EXPR
2426 || TREE_CODE (TREE_OPERAND (expr
, 0)) == TRUTH_ORIF_EXPR
)
2428 expr
= shortcut_cond_expr (expr
);
2430 if (expr
!= *expr_p
)
2434 /* We can't rely on gimplify_expr to re-gimplify the expanded
2435 form properly, as cleanups might cause the target labels to be
2436 wrapped in a TRY_FINALLY_EXPR. To prevent that, we need to
2437 set up a conditional context. */
2438 gimple_push_condition ();
2439 gimplify_stmt (expr_p
);
2440 gimple_pop_condition (pre_p
);
2446 /* Now do the normal gimplification. */
2447 ret
= gimplify_expr (&TREE_OPERAND (expr
, 0), pre_p
, NULL
,
2448 is_gimple_condexpr
, fb_rvalue
);
2450 gimple_push_condition ();
2452 gimplify_to_stmt_list (&TREE_OPERAND (expr
, 1));
2453 gimplify_to_stmt_list (&TREE_OPERAND (expr
, 2));
2454 recalculate_side_effects (expr
);
2456 gimple_pop_condition (pre_p
);
2458 if (ret
== GS_ERROR
)
2460 else if (TREE_SIDE_EFFECTS (TREE_OPERAND (expr
, 1)))
2462 else if (TREE_SIDE_EFFECTS (TREE_OPERAND (expr
, 2)))
2463 /* Rewrite "if (a); else b" to "if (!a) b" */
2465 TREE_OPERAND (expr
, 0) = invert_truthvalue (TREE_OPERAND (expr
, 0));
2466 ret
= gimplify_expr (&TREE_OPERAND (expr
, 0), pre_p
, NULL
,
2467 is_gimple_condexpr
, fb_rvalue
);
2469 tmp
= TREE_OPERAND (expr
, 1);
2470 TREE_OPERAND (expr
, 1) = TREE_OPERAND (expr
, 2);
2471 TREE_OPERAND (expr
, 2) = tmp
;
2474 /* Both arms are empty; replace the COND_EXPR with its predicate. */
2475 expr
= TREE_OPERAND (expr
, 0);
2481 /* A subroutine of gimplify_modify_expr. Replace a MODIFY_EXPR with
2482 a call to __builtin_memcpy. */
2484 static enum gimplify_status
2485 gimplify_modify_expr_to_memcpy (tree
*expr_p
, tree size
, bool want_value
)
2487 tree args
, t
, to
, to_ptr
, from
;
2489 to
= TREE_OPERAND (*expr_p
, 0);
2490 from
= TREE_OPERAND (*expr_p
, 1);
2492 args
= tree_cons (NULL
, size
, NULL
);
2494 t
= build_fold_addr_expr (from
);
2495 args
= tree_cons (NULL
, t
, args
);
2497 to_ptr
= build_fold_addr_expr (to
);
2498 args
= tree_cons (NULL
, to_ptr
, args
);
2499 t
= implicit_built_in_decls
[BUILT_IN_MEMCPY
];
2500 t
= build_function_call_expr (t
, args
);
2504 t
= build1 (NOP_EXPR
, TREE_TYPE (to_ptr
), t
);
2505 t
= build1 (INDIRECT_REF
, TREE_TYPE (to
), t
);
2512 /* A subroutine of gimplify_modify_expr. Replace a MODIFY_EXPR with
2513 a call to __builtin_memset. In this case we know that the RHS is
2514 a CONSTRUCTOR with an empty element list. */
2516 static enum gimplify_status
2517 gimplify_modify_expr_to_memset (tree
*expr_p
, tree size
, bool want_value
)
2519 tree args
, t
, to
, to_ptr
;
2521 to
= TREE_OPERAND (*expr_p
, 0);
2523 args
= tree_cons (NULL
, size
, NULL
);
2525 args
= tree_cons (NULL
, integer_zero_node
, args
);
2527 to_ptr
= build_fold_addr_expr (to
);
2528 args
= tree_cons (NULL
, to_ptr
, args
);
2529 t
= implicit_built_in_decls
[BUILT_IN_MEMSET
];
2530 t
= build_function_call_expr (t
, args
);
2534 t
= build1 (NOP_EXPR
, TREE_TYPE (to_ptr
), t
);
2535 t
= build1 (INDIRECT_REF
, TREE_TYPE (to
), t
);
2542 /* A subroutine of gimplify_init_ctor_preeval. Called via walk_tree,
2543 determine, cautiously, if a CONSTRUCTOR overlaps the lhs of an
2544 assignment. Returns non-null if we detect a potential overlap. */
2546 struct gimplify_init_ctor_preeval_data
2548 /* The base decl of the lhs object. May be NULL, in which case we
2549 have to assume the lhs is indirect. */
2552 /* The alias set of the lhs object. */
2557 gimplify_init_ctor_preeval_1 (tree
*tp
, int *walk_subtrees
, void *xdata
)
2559 struct gimplify_init_ctor_preeval_data
*data
2560 = (struct gimplify_init_ctor_preeval_data
*) xdata
;
2563 /* If we find the base object, obviously we have overlap. */
2564 if (data
->lhs_base_decl
== t
)
2567 /* If the constructor component is indirect, determine if we have a
2568 potential overlap with the lhs. The only bits of information we
2569 have to go on at this point are addressability and alias sets. */
2570 if (TREE_CODE (t
) == INDIRECT_REF
2571 && (!data
->lhs_base_decl
|| TREE_ADDRESSABLE (data
->lhs_base_decl
))
2572 && alias_sets_conflict_p (data
->lhs_alias_set
, get_alias_set (t
)))
2575 if (IS_TYPE_OR_DECL_P (t
))
2580 /* A subroutine of gimplify_init_constructor. Pre-evaluate *EXPR_P,
2581 force values that overlap with the lhs (as described by *DATA)
2582 into temporaries. */
2585 gimplify_init_ctor_preeval (tree
*expr_p
, tree
*pre_p
, tree
*post_p
,
2586 struct gimplify_init_ctor_preeval_data
*data
)
2588 enum gimplify_status one
;
2590 /* If the value is invariant, then there's nothing to pre-evaluate.
2591 But ensure it doesn't have any side-effects since a SAVE_EXPR is
2592 invariant but has side effects and might contain a reference to
2593 the object we're initializing. */
2594 if (TREE_INVARIANT (*expr_p
) && !TREE_SIDE_EFFECTS (*expr_p
))
2597 /* If the type has non-trivial constructors, we can't pre-evaluate. */
2598 if (TREE_ADDRESSABLE (TREE_TYPE (*expr_p
)))
2601 /* Recurse for nested constructors. */
2602 if (TREE_CODE (*expr_p
) == CONSTRUCTOR
)
2604 unsigned HOST_WIDE_INT ix
;
2605 constructor_elt
*ce
;
2606 VEC(constructor_elt
,gc
) *v
= CONSTRUCTOR_ELTS (*expr_p
);
2608 for (ix
= 0; VEC_iterate (constructor_elt
, v
, ix
, ce
); ix
++)
2609 gimplify_init_ctor_preeval (&ce
->value
, pre_p
, post_p
, data
);
2613 /* We can't preevaluate if the type contains a placeholder. */
2614 if (type_contains_placeholder_p (TREE_TYPE (*expr_p
)))
2617 /* Gimplify the constructor element to something appropriate for the rhs
2618 of a MODIFY_EXPR. Given that we know the lhs is an aggregate, we know
2619 the gimplifier will consider this a store to memory. Doing this
2620 gimplification now means that we won't have to deal with complicated
2621 language-specific trees, nor trees like SAVE_EXPR that can induce
2622 exponential search behavior. */
2623 one
= gimplify_expr (expr_p
, pre_p
, post_p
, is_gimple_mem_rhs
, fb_rvalue
);
2624 if (one
== GS_ERROR
)
2630 /* If we gimplified to a bare decl, we can be sure that it doesn't overlap
2631 with the lhs, since "a = { .x=a }" doesn't make sense. This will
2632 always be true for all scalars, since is_gimple_mem_rhs insists on a
2633 temporary variable for them. */
2634 if (DECL_P (*expr_p
))
2637 /* If this is of variable size, we have no choice but to assume it doesn't
2638 overlap since we can't make a temporary for it. */
2639 if (!TREE_CONSTANT (TYPE_SIZE (TREE_TYPE (*expr_p
))))
2642 /* Otherwise, we must search for overlap ... */
2643 if (!walk_tree (expr_p
, gimplify_init_ctor_preeval_1
, data
, NULL
))
2646 /* ... and if found, force the value into a temporary. */
2647 *expr_p
= get_formal_tmp_var (*expr_p
, pre_p
);
2650 /* A subroutine of gimplify_init_ctor_eval. Create a loop for
2651 a RANGE_EXPR in a CONSTRUCTOR for an array.
2655 object[var] = value;
2662 We increment var _after_ the loop exit check because we might otherwise
2663 fail if upper == TYPE_MAX_VALUE (type for upper).
2665 Note that we never have to deal with SAVE_EXPRs here, because this has
2666 already been taken care of for us, in gimplify_init_ctor_preeval(). */
2668 static void gimplify_init_ctor_eval (tree
, VEC(constructor_elt
,gc
) *,
2672 gimplify_init_ctor_eval_range (tree object
, tree lower
, tree upper
,
2673 tree value
, tree array_elt_type
,
2674 tree
*pre_p
, bool cleared
)
2676 tree loop_entry_label
, loop_exit_label
;
2677 tree var
, var_type
, cref
;
2679 loop_entry_label
= create_artificial_label ();
2680 loop_exit_label
= create_artificial_label ();
2682 /* Create and initialize the index variable. */
2683 var_type
= TREE_TYPE (upper
);
2684 var
= create_tmp_var (var_type
, NULL
);
2685 append_to_statement_list (build2 (MODIFY_EXPR
, var_type
, var
, lower
), pre_p
);
2687 /* Add the loop entry label. */
2688 append_to_statement_list (build1 (LABEL_EXPR
,
2693 /* Build the reference. */
2694 cref
= build4 (ARRAY_REF
, array_elt_type
, unshare_expr (object
),
2695 var
, NULL_TREE
, NULL_TREE
);
2697 /* If we are a constructor, just call gimplify_init_ctor_eval to do
2698 the store. Otherwise just assign value to the reference. */
2700 if (TREE_CODE (value
) == CONSTRUCTOR
)
2701 /* NB we might have to call ourself recursively through
2702 gimplify_init_ctor_eval if the value is a constructor. */
2703 gimplify_init_ctor_eval (cref
, CONSTRUCTOR_ELTS (value
),
2706 append_to_statement_list (build2 (MODIFY_EXPR
, TREE_TYPE (cref
),
2710 /* We exit the loop when the index var is equal to the upper bound. */
2711 gimplify_and_add (build3 (COND_EXPR
, void_type_node
,
2712 build2 (EQ_EXPR
, boolean_type_node
,
2720 /* Otherwise, increment the index var... */
2721 append_to_statement_list (build2 (MODIFY_EXPR
, var_type
, var
,
2722 build2 (PLUS_EXPR
, var_type
, var
,
2723 fold_convert (var_type
,
2724 integer_one_node
))),
2727 /* ...and jump back to the loop entry. */
2728 append_to_statement_list (build1 (GOTO_EXPR
,
2733 /* Add the loop exit label. */
2734 append_to_statement_list (build1 (LABEL_EXPR
,
2740 /* Return true if FDECL is accessing a field that is zero sized. */
2743 zero_sized_field_decl (tree fdecl
)
2745 if (TREE_CODE (fdecl
) == FIELD_DECL
&& DECL_SIZE (fdecl
)
2746 && integer_zerop (DECL_SIZE (fdecl
)))
2751 /* Return true if TYPE is zero sized. */
2754 zero_sized_type (tree type
)
2756 if (AGGREGATE_TYPE_P (type
) && TYPE_SIZE (type
)
2757 && integer_zerop (TYPE_SIZE (type
)))
2762 /* A subroutine of gimplify_init_constructor. Generate individual
2763 MODIFY_EXPRs for a CONSTRUCTOR. OBJECT is the LHS against which the
2764 assignments should happen. ELTS is the CONSTRUCTOR_ELTS of the
2765 CONSTRUCTOR. CLEARED is true if the entire LHS object has been
2769 gimplify_init_ctor_eval (tree object
, VEC(constructor_elt
,gc
) *elts
,
2770 tree
*pre_p
, bool cleared
)
2772 tree array_elt_type
= NULL
;
2773 unsigned HOST_WIDE_INT ix
;
2774 tree purpose
, value
;
2776 if (TREE_CODE (TREE_TYPE (object
)) == ARRAY_TYPE
)
2777 array_elt_type
= TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (object
)));
2779 FOR_EACH_CONSTRUCTOR_ELT (elts
, ix
, purpose
, value
)
2783 /* NULL values are created above for gimplification errors. */
2787 if (cleared
&& initializer_zerop (value
))
2790 /* ??? Here's to hoping the front end fills in all of the indices,
2791 so we don't have to figure out what's missing ourselves. */
2792 gcc_assert (purpose
);
2794 /* Skip zero-sized fields, unless value has side-effects. This can
2795 happen with calls to functions returning a zero-sized type, which
2796 we shouldn't discard. As a number of downstream passes don't
2797 expect sets of zero-sized fields, we rely on the gimplification of
2798 the MODIFY_EXPR we make below to drop the assignment statement. */
2799 if (! TREE_SIDE_EFFECTS (value
) && zero_sized_field_decl (purpose
))
2802 /* If we have a RANGE_EXPR, we have to build a loop to assign the
2804 if (TREE_CODE (purpose
) == RANGE_EXPR
)
2806 tree lower
= TREE_OPERAND (purpose
, 0);
2807 tree upper
= TREE_OPERAND (purpose
, 1);
2809 /* If the lower bound is equal to upper, just treat it as if
2810 upper was the index. */
2811 if (simple_cst_equal (lower
, upper
))
2815 gimplify_init_ctor_eval_range (object
, lower
, upper
, value
,
2816 array_elt_type
, pre_p
, cleared
);
2823 cref
= build4 (ARRAY_REF
, array_elt_type
, unshare_expr (object
),
2824 purpose
, NULL_TREE
, NULL_TREE
);
2828 gcc_assert (TREE_CODE (purpose
) == FIELD_DECL
);
2829 cref
= build3 (COMPONENT_REF
, TREE_TYPE (purpose
),
2830 unshare_expr (object
), purpose
, NULL_TREE
);
2833 if (TREE_CODE (value
) == CONSTRUCTOR
2834 && TREE_CODE (TREE_TYPE (value
)) != VECTOR_TYPE
)
2835 gimplify_init_ctor_eval (cref
, CONSTRUCTOR_ELTS (value
),
2839 init
= build2 (MODIFY_EXPR
, TREE_TYPE (cref
), cref
, value
);
2840 gimplify_and_add (init
, pre_p
);
2845 /* A subroutine of gimplify_modify_expr. Break out elements of a
2846 CONSTRUCTOR used as an initializer into separate MODIFY_EXPRs.
2848 Note that we still need to clear any elements that don't have explicit
2849 initializers, so if not all elements are initialized we keep the
2850 original MODIFY_EXPR, we just remove all of the constructor elements. */
2852 static enum gimplify_status
2853 gimplify_init_constructor (tree
*expr_p
, tree
*pre_p
,
2854 tree
*post_p
, bool want_value
)
2857 tree ctor
= TREE_OPERAND (*expr_p
, 1);
2858 tree type
= TREE_TYPE (ctor
);
2859 enum gimplify_status ret
;
2860 VEC(constructor_elt
,gc
) *elts
;
2862 if (TREE_CODE (ctor
) != CONSTRUCTOR
)
2863 return GS_UNHANDLED
;
2865 ret
= gimplify_expr (&TREE_OPERAND (*expr_p
, 0), pre_p
, post_p
,
2866 is_gimple_lvalue
, fb_lvalue
);
2867 if (ret
== GS_ERROR
)
2869 object
= TREE_OPERAND (*expr_p
, 0);
2871 elts
= CONSTRUCTOR_ELTS (ctor
);
2874 switch (TREE_CODE (type
))
2878 case QUAL_UNION_TYPE
:
2881 struct gimplify_init_ctor_preeval_data preeval_data
;
2882 HOST_WIDE_INT num_type_elements
, num_ctor_elements
;
2883 HOST_WIDE_INT num_nonzero_elements
, num_nonconstant_elements
;
2886 /* Aggregate types must lower constructors to initialization of
2887 individual elements. The exception is that a CONSTRUCTOR node
2888 with no elements indicates zero-initialization of the whole. */
2889 if (VEC_empty (constructor_elt
, elts
))
2892 categorize_ctor_elements (ctor
, &num_nonzero_elements
,
2893 &num_nonconstant_elements
,
2894 &num_ctor_elements
, &cleared
);
2896 /* If a const aggregate variable is being initialized, then it
2897 should never be a lose to promote the variable to be static. */
2898 if (num_nonconstant_elements
== 0
2899 && num_nonzero_elements
> 1
2900 && TREE_READONLY (object
)
2901 && TREE_CODE (object
) == VAR_DECL
)
2903 DECL_INITIAL (object
) = ctor
;
2904 TREE_STATIC (object
) = 1;
2905 if (!DECL_NAME (object
))
2906 DECL_NAME (object
) = create_tmp_var_name ("C");
2907 walk_tree (&DECL_INITIAL (object
), force_labels_r
, NULL
, NULL
);
2909 /* ??? C++ doesn't automatically append a .<number> to the
2910 assembler name, and even when it does, it looks a FE private
2911 data structures to figure out what that number should be,
2912 which are not set for this variable. I suppose this is
2913 important for local statics for inline functions, which aren't
2914 "local" in the object file sense. So in order to get a unique
2915 TU-local symbol, we must invoke the lhd version now. */
2916 lhd_set_decl_assembler_name (object
);
2918 *expr_p
= NULL_TREE
;
2922 /* If there are "lots" of initialized elements, even discounting
2923 those that are not address constants (and thus *must* be
2924 computed at runtime), then partition the constructor into
2925 constant and non-constant parts. Block copy the constant
2926 parts in, then generate code for the non-constant parts. */
2927 /* TODO. There's code in cp/typeck.c to do this. */
2929 num_type_elements
= count_type_elements (type
, true);
2931 /* If count_type_elements could not determine number of type elements
2932 for a constant-sized object, assume clearing is needed.
2933 Don't do this for variable-sized objects, as store_constructor
2934 will ignore the clearing of variable-sized objects. */
2935 if (num_type_elements
< 0 && int_size_in_bytes (type
) >= 0)
2937 /* If there are "lots" of zeros, then block clear the object first. */
2938 else if (num_type_elements
- num_nonzero_elements
> CLEAR_RATIO
2939 && num_nonzero_elements
< num_type_elements
/4)
2941 /* ??? This bit ought not be needed. For any element not present
2942 in the initializer, we should simply set them to zero. Except
2943 we'd need to *find* the elements that are not present, and that
2944 requires trickery to avoid quadratic compile-time behavior in
2945 large cases or excessive memory use in small cases. */
2946 else if (num_ctor_elements
< num_type_elements
)
2949 /* If there are "lots" of initialized elements, and all of them
2950 are valid address constants, then the entire initializer can
2951 be dropped to memory, and then memcpy'd out. Don't do this
2952 for sparse arrays, though, as it's more efficient to follow
2953 the standard CONSTRUCTOR behavior of memset followed by
2954 individual element initialization. */
2955 if (num_nonconstant_elements
== 0 && !cleared
)
2957 HOST_WIDE_INT size
= int_size_in_bytes (type
);
2960 /* ??? We can still get unbounded array types, at least
2961 from the C++ front end. This seems wrong, but attempt
2962 to work around it for now. */
2965 size
= int_size_in_bytes (TREE_TYPE (object
));
2967 TREE_TYPE (ctor
) = type
= TREE_TYPE (object
);
2970 /* Find the maximum alignment we can assume for the object. */
2971 /* ??? Make use of DECL_OFFSET_ALIGN. */
2972 if (DECL_P (object
))
2973 align
= DECL_ALIGN (object
);
2975 align
= TYPE_ALIGN (type
);
2977 if (size
> 0 && !can_move_by_pieces (size
, align
))
2979 tree
new = create_tmp_var_raw (type
, "C");
2981 gimple_add_tmp_var (new);
2982 TREE_STATIC (new) = 1;
2983 TREE_READONLY (new) = 1;
2984 DECL_INITIAL (new) = ctor
;
2985 if (align
> DECL_ALIGN (new))
2987 DECL_ALIGN (new) = align
;
2988 DECL_USER_ALIGN (new) = 1;
2990 walk_tree (&DECL_INITIAL (new), force_labels_r
, NULL
, NULL
);
2992 TREE_OPERAND (*expr_p
, 1) = new;
2994 /* This is no longer an assignment of a CONSTRUCTOR, but
2995 we still may have processing to do on the LHS. So
2996 pretend we didn't do anything here to let that happen. */
2997 return GS_UNHANDLED
;
3003 /* Zap the CONSTRUCTOR element list, which simplifies this case.
3004 Note that we still have to gimplify, in order to handle the
3005 case of variable sized types. Avoid shared tree structures. */
3006 CONSTRUCTOR_ELTS (ctor
) = NULL
;
3007 object
= unshare_expr (object
);
3008 gimplify_stmt (expr_p
);
3009 append_to_statement_list (*expr_p
, pre_p
);
3012 /* If we have not block cleared the object, or if there are nonzero
3013 elements in the constructor, add assignments to the individual
3014 scalar fields of the object. */
3015 if (!cleared
|| num_nonzero_elements
> 0)
3017 preeval_data
.lhs_base_decl
= get_base_address (object
);
3018 if (!DECL_P (preeval_data
.lhs_base_decl
))
3019 preeval_data
.lhs_base_decl
= NULL
;
3020 preeval_data
.lhs_alias_set
= get_alias_set (object
);
3022 gimplify_init_ctor_preeval (&TREE_OPERAND (*expr_p
, 1),
3023 pre_p
, post_p
, &preeval_data
);
3024 gimplify_init_ctor_eval (object
, elts
, pre_p
, cleared
);
3027 *expr_p
= NULL_TREE
;
3035 /* Extract the real and imaginary parts out of the ctor. */
3036 gcc_assert (VEC_length (constructor_elt
, elts
) == 2);
3037 r
= VEC_index (constructor_elt
, elts
, 0)->value
;
3038 i
= VEC_index (constructor_elt
, elts
, 1)->value
;
3039 if (r
== NULL
|| i
== NULL
)
3041 tree zero
= convert (TREE_TYPE (type
), integer_zero_node
);
3048 /* Complex types have either COMPLEX_CST or COMPLEX_EXPR to
3049 represent creation of a complex value. */
3050 if (TREE_CONSTANT (r
) && TREE_CONSTANT (i
))
3052 ctor
= build_complex (type
, r
, i
);
3053 TREE_OPERAND (*expr_p
, 1) = ctor
;
3057 ctor
= build2 (COMPLEX_EXPR
, type
, r
, i
);
3058 TREE_OPERAND (*expr_p
, 1) = ctor
;
3059 ret
= gimplify_expr (&TREE_OPERAND (*expr_p
, 1), pre_p
, post_p
,
3060 rhs_predicate_for (TREE_OPERAND (*expr_p
, 0)),
3068 unsigned HOST_WIDE_INT ix
;
3069 constructor_elt
*ce
;
3071 /* Go ahead and simplify constant constructors to VECTOR_CST. */
3072 if (TREE_CONSTANT (ctor
))
3074 bool constant_p
= true;
3077 /* Even when ctor is constant, it might contain non-*_CST
3078 elements (e.g. { 1.0/0.0 - 1.0/0.0, 0.0 }) and those don't
3079 belong into VECTOR_CST nodes. */
3080 FOR_EACH_CONSTRUCTOR_VALUE (elts
, ix
, value
)
3081 if (!CONSTANT_CLASS_P (value
))
3089 TREE_OPERAND (*expr_p
, 1) = build_vector_from_ctor (type
, elts
);
3094 /* Vector types use CONSTRUCTOR all the way through gimple
3095 compilation as a general initializer. */
3096 for (ix
= 0; VEC_iterate (constructor_elt
, elts
, ix
, ce
); ix
++)
3098 enum gimplify_status tret
;
3099 tret
= gimplify_expr (&ce
->value
, pre_p
, post_p
,
3100 is_gimple_val
, fb_rvalue
);
3101 if (tret
== GS_ERROR
)
3108 /* So how did we get a CONSTRUCTOR for a scalar type? */
3112 if (ret
== GS_ERROR
)
3114 else if (want_value
)
3116 append_to_statement_list (*expr_p
, pre_p
);
3124 /* Given a pointer value OP0, return a simplified version of an
3125 indirection through OP0, or NULL_TREE if no simplification is
3126 possible. This may only be applied to a rhs of an expression.
3127 Note that the resulting type may be different from the type pointed
3128 to in the sense that it is still compatible from the langhooks
3132 fold_indirect_ref_rhs (tree t
)
3134 tree type
= TREE_TYPE (TREE_TYPE (t
));
3139 subtype
= TREE_TYPE (sub
);
3140 if (!POINTER_TYPE_P (subtype
))
3143 if (TREE_CODE (sub
) == ADDR_EXPR
)
3145 tree op
= TREE_OPERAND (sub
, 0);
3146 tree optype
= TREE_TYPE (op
);
3148 if (lang_hooks
.types_compatible_p (type
, optype
))
3150 /* *(foo *)&fooarray => fooarray[0] */
3151 else if (TREE_CODE (optype
) == ARRAY_TYPE
3152 && lang_hooks
.types_compatible_p (type
, TREE_TYPE (optype
)))
3154 tree type_domain
= TYPE_DOMAIN (optype
);
3155 tree min_val
= size_zero_node
;
3156 if (type_domain
&& TYPE_MIN_VALUE (type_domain
))
3157 min_val
= TYPE_MIN_VALUE (type_domain
);
3158 return build4 (ARRAY_REF
, type
, op
, min_val
, NULL_TREE
, NULL_TREE
);
3162 /* *(foo *)fooarrptr => (*fooarrptr)[0] */
3163 if (TREE_CODE (TREE_TYPE (subtype
)) == ARRAY_TYPE
3164 && lang_hooks
.types_compatible_p (type
, TREE_TYPE (TREE_TYPE (subtype
))))
3167 tree min_val
= size_zero_node
;
3169 sub
= fold_indirect_ref_rhs (sub
);
3171 sub
= build1 (INDIRECT_REF
, TREE_TYPE (subtype
), osub
);
3172 type_domain
= TYPE_DOMAIN (TREE_TYPE (sub
));
3173 if (type_domain
&& TYPE_MIN_VALUE (type_domain
))
3174 min_val
= TYPE_MIN_VALUE (type_domain
);
3175 return build4 (ARRAY_REF
, type
, sub
, min_val
, NULL_TREE
, NULL_TREE
);
3181 /* Subroutine of gimplify_modify_expr to do simplifications of MODIFY_EXPRs
3182 based on the code of the RHS. We loop for as long as something changes. */
3184 static enum gimplify_status
3185 gimplify_modify_expr_rhs (tree
*expr_p
, tree
*from_p
, tree
*to_p
, tree
*pre_p
,
3186 tree
*post_p
, bool want_value
)
3188 enum gimplify_status ret
= GS_OK
;
3190 while (ret
!= GS_UNHANDLED
)
3191 switch (TREE_CODE (*from_p
))
3195 /* If we have code like
3199 where the type of "x" is a (possibly cv-qualified variant
3200 of "A"), treat the entire expression as identical to "x".
3201 This kind of code arises in C++ when an object is bound
3202 to a const reference, and if "x" is a TARGET_EXPR we want
3203 to take advantage of the optimization below. */
3204 tree t
= fold_indirect_ref_rhs (TREE_OPERAND (*from_p
, 0));
3217 /* If we are initializing something from a TARGET_EXPR, strip the
3218 TARGET_EXPR and initialize it directly, if possible. This can't
3219 be done if the initializer is void, since that implies that the
3220 temporary is set in some non-trivial way.
3222 ??? What about code that pulls out the temp and uses it
3223 elsewhere? I think that such code never uses the TARGET_EXPR as
3224 an initializer. If I'm wrong, we'll die because the temp won't
3225 have any RTL. In that case, I guess we'll need to replace
3226 references somehow. */
3227 tree init
= TARGET_EXPR_INITIAL (*from_p
);
3229 if (!VOID_TYPE_P (TREE_TYPE (init
)))
3240 /* Remove any COMPOUND_EXPR in the RHS so the following cases will be
3242 gimplify_compound_expr (from_p
, pre_p
, true);
3247 /* If we're initializing from a CONSTRUCTOR, break this into
3248 individual MODIFY_EXPRs. */
3249 return gimplify_init_constructor (expr_p
, pre_p
, post_p
, want_value
);
3252 /* If we're assigning to a non-register type, push the assignment
3253 down into the branches. This is mandatory for ADDRESSABLE types,
3254 since we cannot generate temporaries for such, but it saves a
3255 copy in other cases as well. */
3256 if (!is_gimple_reg_type (TREE_TYPE (*from_p
)))
3259 return gimplify_cond_expr (expr_p
, pre_p
, post_p
, *to_p
,
3267 /* For calls that return in memory, give *to_p as the CALL_EXPR's
3268 return slot so that we don't generate a temporary. */
3269 if (!CALL_EXPR_RETURN_SLOT_OPT (*from_p
)
3270 && aggregate_value_p (*from_p
, *from_p
))
3274 if (TREE_CODE (*to_p
) == RESULT_DECL
3275 && needs_to_live_in_memory (*to_p
))
3276 /* It's always OK to use the return slot directly. */
3278 else if (!is_gimple_non_addressable (*to_p
))
3279 /* Don't use the original target if it's already addressable;
3280 if its address escapes, and the called function uses the
3281 NRV optimization, a conforming program could see *to_p
3282 change before the called function returns; see c++/19317.
3283 When optimizing, the return_slot pass marks more functions
3284 as safe after we have escape info. */
3286 else if (TREE_CODE (*to_p
) != PARM_DECL
3287 && DECL_GIMPLE_FORMAL_TEMP_P (*to_p
))
3288 /* Don't use the original target if it's a formal temp; we
3289 don't want to take their addresses. */
3291 else if (is_gimple_reg_type (TREE_TYPE (*to_p
)))
3292 /* Also don't force regs into memory. */
3299 CALL_EXPR_RETURN_SLOT_OPT (*from_p
) = 1;
3300 lang_hooks
.mark_addressable (*to_p
);
3315 /* Promote partial stores to COMPLEX variables to total stores. *EXPR_P is
3316 a MODIFY_EXPR with a lhs of a REAL/IMAGPART_EXPR of a variable with
3317 DECL_COMPLEX_GIMPLE_REG_P set. */
3319 static enum gimplify_status
3320 gimplify_modify_expr_complex_part (tree
*expr_p
, tree
*pre_p
, bool want_value
)
3322 enum tree_code code
, ocode
;
3323 tree lhs
, rhs
, new_rhs
, other
, realpart
, imagpart
;
3325 lhs
= TREE_OPERAND (*expr_p
, 0);
3326 rhs
= TREE_OPERAND (*expr_p
, 1);
3327 code
= TREE_CODE (lhs
);
3328 lhs
= TREE_OPERAND (lhs
, 0);
3330 ocode
= code
== REALPART_EXPR
? IMAGPART_EXPR
: REALPART_EXPR
;
3331 other
= build1 (ocode
, TREE_TYPE (rhs
), lhs
);
3332 other
= get_formal_tmp_var (other
, pre_p
);
3334 realpart
= code
== REALPART_EXPR
? rhs
: other
;
3335 imagpart
= code
== REALPART_EXPR
? other
: rhs
;
3337 if (TREE_CONSTANT (realpart
) && TREE_CONSTANT (imagpart
))
3338 new_rhs
= build_complex (TREE_TYPE (lhs
), realpart
, imagpart
);
3340 new_rhs
= build2 (COMPLEX_EXPR
, TREE_TYPE (lhs
), realpart
, imagpart
);
3342 TREE_OPERAND (*expr_p
, 0) = lhs
;
3343 TREE_OPERAND (*expr_p
, 1) = new_rhs
;
3347 append_to_statement_list (*expr_p
, pre_p
);
3354 /* Gimplify the MODIFY_EXPR node pointed to by EXPR_P.
3360 PRE_P points to the list where side effects that must happen before
3361 *EXPR_P should be stored.
3363 POST_P points to the list where side effects that must happen after
3364 *EXPR_P should be stored.
3366 WANT_VALUE is nonzero iff we want to use the value of this expression
3367 in another expression. */
3369 static enum gimplify_status
3370 gimplify_modify_expr (tree
*expr_p
, tree
*pre_p
, tree
*post_p
, bool want_value
)
3372 tree
*from_p
= &TREE_OPERAND (*expr_p
, 1);
3373 tree
*to_p
= &TREE_OPERAND (*expr_p
, 0);
3374 enum gimplify_status ret
= GS_UNHANDLED
;
3376 gcc_assert (TREE_CODE (*expr_p
) == MODIFY_EXPR
3377 || TREE_CODE (*expr_p
) == INIT_EXPR
);
3379 /* The distinction between MODIFY_EXPR and INIT_EXPR is no longer useful. */
3380 if (TREE_CODE (*expr_p
) == INIT_EXPR
)
3381 TREE_SET_CODE (*expr_p
, MODIFY_EXPR
);
3383 /* For zero sized types only gimplify the left hand side and right hand side
3384 as statements and throw away the assignment. */
3385 if (zero_sized_type (TREE_TYPE (*from_p
)))
3387 gimplify_stmt (from_p
);
3388 gimplify_stmt (to_p
);
3389 append_to_statement_list (*from_p
, pre_p
);
3390 append_to_statement_list (*to_p
, pre_p
);
3391 *expr_p
= NULL_TREE
;
3395 /* See if any simplifications can be done based on what the RHS is. */
3396 ret
= gimplify_modify_expr_rhs (expr_p
, from_p
, to_p
, pre_p
, post_p
,
3398 if (ret
!= GS_UNHANDLED
)
3401 /* If the value being copied is of variable width, compute the length
3402 of the copy into a WITH_SIZE_EXPR. Note that we need to do this
3403 before gimplifying any of the operands so that we can resolve any
3404 PLACEHOLDER_EXPRs in the size. Also note that the RTL expander uses
3405 the size of the expression to be copied, not of the destination, so
3406 that is what we must here. */
3407 maybe_with_size_expr (from_p
);
3409 ret
= gimplify_expr (to_p
, pre_p
, post_p
, is_gimple_lvalue
, fb_lvalue
);
3410 if (ret
== GS_ERROR
)
3413 ret
= gimplify_expr (from_p
, pre_p
, post_p
,
3414 rhs_predicate_for (*to_p
), fb_rvalue
);
3415 if (ret
== GS_ERROR
)
3418 /* Now see if the above changed *from_p to something we handle specially. */
3419 ret
= gimplify_modify_expr_rhs (expr_p
, from_p
, to_p
, pre_p
, post_p
,
3421 if (ret
!= GS_UNHANDLED
)
3424 /* If we've got a variable sized assignment between two lvalues (i.e. does
3425 not involve a call), then we can make things a bit more straightforward
3426 by converting the assignment to memcpy or memset. */
3427 if (TREE_CODE (*from_p
) == WITH_SIZE_EXPR
)
3429 tree from
= TREE_OPERAND (*from_p
, 0);
3430 tree size
= TREE_OPERAND (*from_p
, 1);
3432 if (TREE_CODE (from
) == CONSTRUCTOR
)
3433 return gimplify_modify_expr_to_memset (expr_p
, size
, want_value
);
3434 if (is_gimple_addressable (from
))
3437 return gimplify_modify_expr_to_memcpy (expr_p
, size
, want_value
);
3441 /* Transform partial stores to non-addressable complex variables into
3442 total stores. This allows us to use real instead of virtual operands
3443 for these variables, which improves optimization. */
3444 if ((TREE_CODE (*to_p
) == REALPART_EXPR
3445 || TREE_CODE (*to_p
) == IMAGPART_EXPR
)
3446 && is_gimple_reg (TREE_OPERAND (*to_p
, 0)))
3447 return gimplify_modify_expr_complex_part (expr_p
, pre_p
, want_value
);
3449 if (gimplify_ctxp
->into_ssa
&& is_gimple_reg (*to_p
))
3451 /* If we've somehow already got an SSA_NAME on the LHS, then
3452 we're probably modified it twice. Not good. */
3453 gcc_assert (TREE_CODE (*to_p
) != SSA_NAME
);
3454 *to_p
= make_ssa_name (*to_p
, *expr_p
);
3459 append_to_statement_list (*expr_p
, pre_p
);
3467 /* Gimplify a comparison between two variable-sized objects. Do this
3468 with a call to BUILT_IN_MEMCMP. */
3470 static enum gimplify_status
3471 gimplify_variable_sized_compare (tree
*expr_p
)
3473 tree op0
= TREE_OPERAND (*expr_p
, 0);
3474 tree op1
= TREE_OPERAND (*expr_p
, 1);
3477 t
= TYPE_SIZE_UNIT (TREE_TYPE (op0
));
3478 t
= unshare_expr (t
);
3479 t
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (t
, op0
);
3480 args
= tree_cons (NULL
, t
, NULL
);
3481 t
= build_fold_addr_expr (op1
);
3482 args
= tree_cons (NULL
, t
, args
);
3483 dest
= build_fold_addr_expr (op0
);
3484 args
= tree_cons (NULL
, dest
, args
);
3485 t
= implicit_built_in_decls
[BUILT_IN_MEMCMP
];
3486 t
= build_function_call_expr (t
, args
);
3488 = build2 (TREE_CODE (*expr_p
), TREE_TYPE (*expr_p
), t
, integer_zero_node
);
3493 /* Gimplify TRUTH_ANDIF_EXPR and TRUTH_ORIF_EXPR expressions. EXPR_P
3494 points to the expression to gimplify.
3496 Expressions of the form 'a && b' are gimplified to:
3498 a && b ? true : false
3500 gimplify_cond_expr will do the rest.
3502 PRE_P points to the list where side effects that must happen before
3503 *EXPR_P should be stored. */
3505 static enum gimplify_status
3506 gimplify_boolean_expr (tree
*expr_p
)
3508 /* Preserve the original type of the expression. */
3509 tree type
= TREE_TYPE (*expr_p
);
3511 *expr_p
= build3 (COND_EXPR
, type
, *expr_p
,
3512 convert (type
, boolean_true_node
),
3513 convert (type
, boolean_false_node
));
3518 /* Gimplifies an expression sequence. This function gimplifies each
3519 expression and re-writes the original expression with the last
3520 expression of the sequence in GIMPLE form.
3522 PRE_P points to the list where the side effects for all the
3523 expressions in the sequence will be emitted.
3525 WANT_VALUE is true when the result of the last COMPOUND_EXPR is used. */
3526 /* ??? Should rearrange to share the pre-queue with all the indirect
3527 invocations of gimplify_expr. Would probably save on creations
3528 of statement_list nodes. */
3530 static enum gimplify_status
3531 gimplify_compound_expr (tree
*expr_p
, tree
*pre_p
, bool want_value
)
3537 tree
*sub_p
= &TREE_OPERAND (t
, 0);
3539 if (TREE_CODE (*sub_p
) == COMPOUND_EXPR
)
3540 gimplify_compound_expr (sub_p
, pre_p
, false);
3542 gimplify_stmt (sub_p
);
3543 append_to_statement_list (*sub_p
, pre_p
);
3545 t
= TREE_OPERAND (t
, 1);
3547 while (TREE_CODE (t
) == COMPOUND_EXPR
);
3554 gimplify_stmt (expr_p
);
3559 /* Gimplifies a statement list. These may be created either by an
3560 enlightened front-end, or by shortcut_cond_expr. */
3562 static enum gimplify_status
3563 gimplify_statement_list (tree
*expr_p
)
3565 tree_stmt_iterator i
= tsi_start (*expr_p
);
3567 while (!tsi_end_p (i
))
3571 gimplify_stmt (tsi_stmt_ptr (i
));
3576 else if (TREE_CODE (t
) == STATEMENT_LIST
)
3578 tsi_link_before (&i
, t
, TSI_SAME_STMT
);
3588 /* Gimplify a SAVE_EXPR node. EXPR_P points to the expression to
3589 gimplify. After gimplification, EXPR_P will point to a new temporary
3590 that holds the original value of the SAVE_EXPR node.
3592 PRE_P points to the list where side effects that must happen before
3593 *EXPR_P should be stored. */
3595 static enum gimplify_status
3596 gimplify_save_expr (tree
*expr_p
, tree
*pre_p
, tree
*post_p
)
3598 enum gimplify_status ret
= GS_ALL_DONE
;
3601 gcc_assert (TREE_CODE (*expr_p
) == SAVE_EXPR
);
3602 val
= TREE_OPERAND (*expr_p
, 0);
3604 /* If the SAVE_EXPR has not been resolved, then evaluate it once. */
3605 if (!SAVE_EXPR_RESOLVED_P (*expr_p
))
3607 /* The operand may be a void-valued expression such as SAVE_EXPRs
3608 generated by the Java frontend for class initialization. It is
3609 being executed only for its side-effects. */
3610 if (TREE_TYPE (val
) == void_type_node
)
3612 ret
= gimplify_expr (&TREE_OPERAND (*expr_p
, 0), pre_p
, post_p
,
3613 is_gimple_stmt
, fb_none
);
3614 append_to_statement_list (TREE_OPERAND (*expr_p
, 0), pre_p
);
3618 val
= get_initialized_tmp_var (val
, pre_p
, post_p
);
3620 TREE_OPERAND (*expr_p
, 0) = val
;
3621 SAVE_EXPR_RESOLVED_P (*expr_p
) = 1;
3629 /* Re-write the ADDR_EXPR node pointed to by EXPR_P
3636 PRE_P points to the list where side effects that must happen before
3637 *EXPR_P should be stored.
3639 POST_P points to the list where side effects that must happen after
3640 *EXPR_P should be stored. */
3642 static enum gimplify_status
3643 gimplify_addr_expr (tree
*expr_p
, tree
*pre_p
, tree
*post_p
)
3645 tree expr
= *expr_p
;
3646 tree op0
= TREE_OPERAND (expr
, 0);
3647 enum gimplify_status ret
;
3649 switch (TREE_CODE (op0
))
3652 case MISALIGNED_INDIRECT_REF
:
3654 /* Check if we are dealing with an expression of the form '&*ptr'.
3655 While the front end folds away '&*ptr' into 'ptr', these
3656 expressions may be generated internally by the compiler (e.g.,
3657 builtins like __builtin_va_end). */
3658 /* Caution: the silent array decomposition semantics we allow for
3659 ADDR_EXPR means we can't always discard the pair. */
3660 /* Gimplification of the ADDR_EXPR operand may drop
3661 cv-qualification conversions, so make sure we add them if
3664 tree op00
= TREE_OPERAND (op0
, 0);
3665 tree t_expr
= TREE_TYPE (expr
);
3666 tree t_op00
= TREE_TYPE (op00
);
3668 if (!lang_hooks
.types_compatible_p (t_expr
, t_op00
))
3670 #ifdef ENABLE_CHECKING
3671 tree t_op0
= TREE_TYPE (op0
);
3672 gcc_assert (POINTER_TYPE_P (t_expr
)
3673 && cpt_same_type (TREE_CODE (t_op0
) == ARRAY_TYPE
3674 ? TREE_TYPE (t_op0
) : t_op0
,
3676 && POINTER_TYPE_P (t_op00
)
3677 && cpt_same_type (t_op0
, TREE_TYPE (t_op00
)));
3679 op00
= fold_convert (TREE_TYPE (expr
), op00
);
3686 case VIEW_CONVERT_EXPR
:
3687 /* Take the address of our operand and then convert it to the type of
3690 ??? The interactions of VIEW_CONVERT_EXPR and aliasing is not at
3691 all clear. The impact of this transformation is even less clear. */
3693 /* If the operand is a useless conversion, look through it. Doing so
3694 guarantees that the ADDR_EXPR and its operand will remain of the
3696 if (tree_ssa_useless_type_conversion (TREE_OPERAND (op0
, 0)))
3697 op0
= TREE_OPERAND (op0
, 0);
3699 *expr_p
= fold_convert (TREE_TYPE (expr
),
3700 build_fold_addr_expr (TREE_OPERAND (op0
, 0)));
3705 /* We use fb_either here because the C frontend sometimes takes
3706 the address of a call that returns a struct; see
3707 gcc.dg/c99-array-lval-1.c. The gimplifier will correctly make
3708 the implied temporary explicit. */
3709 ret
= gimplify_expr (&TREE_OPERAND (expr
, 0), pre_p
, post_p
,
3710 is_gimple_addressable
, fb_either
);
3711 if (ret
!= GS_ERROR
)
3713 op0
= TREE_OPERAND (expr
, 0);
3715 /* For various reasons, the gimplification of the expression
3716 may have made a new INDIRECT_REF. */
3717 if (TREE_CODE (op0
) == INDIRECT_REF
)
3718 goto do_indirect_ref
;
3720 /* Make sure TREE_INVARIANT, TREE_CONSTANT, and TREE_SIDE_EFFECTS
3722 recompute_tree_invariant_for_addr_expr (expr
);
3724 /* Mark the RHS addressable. */
3725 lang_hooks
.mark_addressable (TREE_OPERAND (expr
, 0));
3733 /* Gimplify the operands of an ASM_EXPR. Input operands should be a gimple
3734 value; output operands should be a gimple lvalue. */
3736 static enum gimplify_status
3737 gimplify_asm_expr (tree
*expr_p
, tree
*pre_p
, tree
*post_p
)
3739 tree expr
= *expr_p
;
3740 int noutputs
= list_length (ASM_OUTPUTS (expr
));
3741 const char **oconstraints
3742 = (const char **) alloca ((noutputs
) * sizeof (const char *));
3745 const char *constraint
;
3746 bool allows_mem
, allows_reg
, is_inout
;
3747 enum gimplify_status ret
, tret
;
3750 for (i
= 0, link
= ASM_OUTPUTS (expr
); link
; ++i
, link
= TREE_CHAIN (link
))
3752 size_t constraint_len
;
3753 oconstraints
[i
] = constraint
3754 = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link
)));
3755 constraint_len
= strlen (constraint
);
3756 if (constraint_len
== 0)
3759 parse_output_constraint (&constraint
, i
, 0, 0,
3760 &allows_mem
, &allows_reg
, &is_inout
);
3762 if (!allows_reg
&& allows_mem
)
3763 lang_hooks
.mark_addressable (TREE_VALUE (link
));
3765 tret
= gimplify_expr (&TREE_VALUE (link
), pre_p
, post_p
,
3766 is_inout
? is_gimple_min_lval
: is_gimple_lvalue
,
3767 fb_lvalue
| fb_mayfail
);
3768 if (tret
== GS_ERROR
)
3770 error ("invalid lvalue in asm output %d", i
);
3776 /* An input/output operand. To give the optimizers more
3777 flexibility, split it into separate input and output
3782 /* Turn the in/out constraint into an output constraint. */
3783 char *p
= xstrdup (constraint
);
3785 TREE_VALUE (TREE_PURPOSE (link
)) = build_string (constraint_len
, p
);
3787 /* And add a matching input constraint. */
3790 sprintf (buf
, "%d", i
);
3792 /* If there are multiple alternatives in the constraint,
3793 handle each of them individually. Those that allow register
3794 will be replaced with operand number, the others will stay
3796 if (strchr (p
, ',') != NULL
)
3798 size_t len
= 0, buflen
= strlen (buf
);
3799 char *beg
, *end
, *str
, *dst
;
3803 end
= strchr (beg
, ',');
3805 end
= strchr (beg
, '\0');
3806 if ((size_t) (end
- beg
) < buflen
)
3809 len
+= end
- beg
+ 1;
3816 str
= (char *) alloca (len
);
3817 for (beg
= p
+ 1, dst
= str
;;)
3820 bool mem_p
, reg_p
, inout_p
;
3822 end
= strchr (beg
, ',');
3827 parse_output_constraint (&tem
, i
, 0, 0,
3828 &mem_p
, ®_p
, &inout_p
);
3833 memcpy (dst
, buf
, buflen
);
3842 memcpy (dst
, beg
, len
);
3851 input
= build_string (dst
- str
, str
);
3854 input
= build_string (strlen (buf
), buf
);
3857 input
= build_string (constraint_len
- 1, constraint
+ 1);
3861 input
= build_tree_list (build_tree_list (NULL_TREE
, input
),
3862 unshare_expr (TREE_VALUE (link
)));
3863 ASM_INPUTS (expr
) = chainon (ASM_INPUTS (expr
), input
);
3867 for (link
= ASM_INPUTS (expr
); link
; ++i
, link
= TREE_CHAIN (link
))
3870 = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link
)));
3871 parse_input_constraint (&constraint
, 0, 0, noutputs
, 0,
3872 oconstraints
, &allows_mem
, &allows_reg
);
3874 /* If the operand is a memory input, it should be an lvalue. */
3875 if (!allows_reg
&& allows_mem
)
3877 lang_hooks
.mark_addressable (TREE_VALUE (link
));
3878 tret
= gimplify_expr (&TREE_VALUE (link
), pre_p
, post_p
,
3879 is_gimple_lvalue
, fb_lvalue
| fb_mayfail
);
3880 if (tret
== GS_ERROR
)
3882 error ("memory input %d is not directly addressable", i
);
3888 tret
= gimplify_expr (&TREE_VALUE (link
), pre_p
, post_p
,
3889 is_gimple_asm_val
, fb_rvalue
);
3890 if (tret
== GS_ERROR
)
3898 /* Gimplify a CLEANUP_POINT_EXPR. Currently this works by adding
3899 WITH_CLEANUP_EXPRs to the prequeue as we encounter cleanups while
3900 gimplifying the body, and converting them to TRY_FINALLY_EXPRs when we
3901 return to this function.
3903 FIXME should we complexify the prequeue handling instead? Or use flags
3904 for all the cleanups and let the optimizer tighten them up? The current
3905 code seems pretty fragile; it will break on a cleanup within any
3906 non-conditional nesting. But any such nesting would be broken, anyway;
3907 we can't write a TRY_FINALLY_EXPR that starts inside a nesting construct
3908 and continues out of it. We can do that at the RTL level, though, so
3909 having an optimizer to tighten up try/finally regions would be a Good
3912 static enum gimplify_status
3913 gimplify_cleanup_point_expr (tree
*expr_p
, tree
*pre_p
)
3915 tree_stmt_iterator iter
;
3918 tree temp
= voidify_wrapper_expr (*expr_p
, NULL
);
3920 /* We only care about the number of conditions between the innermost
3921 CLEANUP_POINT_EXPR and the cleanup. So save and reset the count and
3922 any cleanups collected outside the CLEANUP_POINT_EXPR. */
3923 int old_conds
= gimplify_ctxp
->conditions
;
3924 tree old_cleanups
= gimplify_ctxp
->conditional_cleanups
;
3925 gimplify_ctxp
->conditions
= 0;
3926 gimplify_ctxp
->conditional_cleanups
= NULL_TREE
;
3928 body
= TREE_OPERAND (*expr_p
, 0);
3929 gimplify_to_stmt_list (&body
);
3931 gimplify_ctxp
->conditions
= old_conds
;
3932 gimplify_ctxp
->conditional_cleanups
= old_cleanups
;
3934 for (iter
= tsi_start (body
); !tsi_end_p (iter
); )
3936 tree
*wce_p
= tsi_stmt_ptr (iter
);
3939 if (TREE_CODE (wce
) == WITH_CLEANUP_EXPR
)
3941 if (tsi_one_before_end_p (iter
))
3943 tsi_link_before (&iter
, TREE_OPERAND (wce
, 0), TSI_SAME_STMT
);
3950 enum tree_code code
;
3952 if (CLEANUP_EH_ONLY (wce
))
3953 code
= TRY_CATCH_EXPR
;
3955 code
= TRY_FINALLY_EXPR
;
3957 sl
= tsi_split_statement_list_after (&iter
);
3958 tfe
= build2 (code
, void_type_node
, sl
, NULL_TREE
);
3959 append_to_statement_list (TREE_OPERAND (wce
, 0),
3960 &TREE_OPERAND (tfe
, 1));
3962 iter
= tsi_start (sl
);
3972 append_to_statement_list (body
, pre_p
);
3982 /* Insert a cleanup marker for gimplify_cleanup_point_expr. CLEANUP
3983 is the cleanup action required. */
3986 gimple_push_cleanup (tree var
, tree cleanup
, bool eh_only
, tree
*pre_p
)
3990 /* Errors can result in improperly nested cleanups. Which results in
3991 confusion when trying to resolve the WITH_CLEANUP_EXPR. */
3992 if (errorcount
|| sorrycount
)
3995 if (gimple_conditional_context ())
3997 /* If we're in a conditional context, this is more complex. We only
3998 want to run the cleanup if we actually ran the initialization that
3999 necessitates it, but we want to run it after the end of the
4000 conditional context. So we wrap the try/finally around the
4001 condition and use a flag to determine whether or not to actually
4002 run the destructor. Thus
4006 becomes (approximately)
4010 if (test) { A::A(temp); flag = 1; val = f(temp); }
4013 if (flag) A::~A(temp);
4018 tree flag
= create_tmp_var (boolean_type_node
, "cleanup");
4019 tree ffalse
= build2 (MODIFY_EXPR
, void_type_node
, flag
,
4020 boolean_false_node
);
4021 tree ftrue
= build2 (MODIFY_EXPR
, void_type_node
, flag
,
4023 cleanup
= build3 (COND_EXPR
, void_type_node
, flag
, cleanup
, NULL
);
4024 wce
= build1 (WITH_CLEANUP_EXPR
, void_type_node
, cleanup
);
4025 append_to_statement_list (ffalse
, &gimplify_ctxp
->conditional_cleanups
);
4026 append_to_statement_list (wce
, &gimplify_ctxp
->conditional_cleanups
);
4027 append_to_statement_list (ftrue
, pre_p
);
4029 /* Because of this manipulation, and the EH edges that jump
4030 threading cannot redirect, the temporary (VAR) will appear
4031 to be used uninitialized. Don't warn. */
4032 TREE_NO_WARNING (var
) = 1;
4036 wce
= build1 (WITH_CLEANUP_EXPR
, void_type_node
, cleanup
);
4037 CLEANUP_EH_ONLY (wce
) = eh_only
;
4038 append_to_statement_list (wce
, pre_p
);
4041 gimplify_stmt (&TREE_OPERAND (wce
, 0));
4044 /* Gimplify a TARGET_EXPR which doesn't appear on the rhs of an INIT_EXPR. */
4046 static enum gimplify_status
4047 gimplify_target_expr (tree
*expr_p
, tree
*pre_p
, tree
*post_p
)
4049 tree targ
= *expr_p
;
4050 tree temp
= TARGET_EXPR_SLOT (targ
);
4051 tree init
= TARGET_EXPR_INITIAL (targ
);
4052 enum gimplify_status ret
;
4056 /* TARGET_EXPR temps aren't part of the enclosing block, so add it
4057 to the temps list. */
4058 gimple_add_tmp_var (temp
);
4060 /* If TARGET_EXPR_INITIAL is void, then the mere evaluation of the
4061 expression is supposed to initialize the slot. */
4062 if (VOID_TYPE_P (TREE_TYPE (init
)))
4063 ret
= gimplify_expr (&init
, pre_p
, post_p
, is_gimple_stmt
, fb_none
);
4066 /* Special handling for BIND_EXPR can result in fewer temps. */
4068 if (TREE_CODE (init
) == BIND_EXPR
)
4069 gimplify_bind_expr (&init
, temp
, pre_p
);
4072 init
= build2 (MODIFY_EXPR
, void_type_node
, temp
, init
);
4073 ret
= gimplify_expr (&init
, pre_p
, post_p
, is_gimple_stmt
,
4077 if (ret
== GS_ERROR
)
4079 append_to_statement_list (init
, pre_p
);
4081 /* If needed, push the cleanup for the temp. */
4082 if (TARGET_EXPR_CLEANUP (targ
))
4084 gimplify_stmt (&TARGET_EXPR_CLEANUP (targ
));
4085 gimple_push_cleanup (temp
, TARGET_EXPR_CLEANUP (targ
),
4086 CLEANUP_EH_ONLY (targ
), pre_p
);
4089 /* Only expand this once. */
4090 TREE_OPERAND (targ
, 3) = init
;
4091 TARGET_EXPR_INITIAL (targ
) = NULL_TREE
;
4094 /* We should have expanded this before. */
4095 gcc_assert (DECL_SEEN_IN_BIND_EXPR_P (temp
));
4101 /* Gimplification of expression trees. */
4103 /* Gimplify an expression which appears at statement context; usually, this
4104 means replacing it with a suitably gimple STATEMENT_LIST. */
4107 gimplify_stmt (tree
*stmt_p
)
4109 gimplify_expr (stmt_p
, NULL
, NULL
, is_gimple_stmt
, fb_none
);
4112 /* Similarly, but force the result to be a STATEMENT_LIST. */
4115 gimplify_to_stmt_list (tree
*stmt_p
)
4117 gimplify_stmt (stmt_p
);
4119 *stmt_p
= alloc_stmt_list ();
4120 else if (TREE_CODE (*stmt_p
) != STATEMENT_LIST
)
4123 *stmt_p
= alloc_stmt_list ();
4124 append_to_statement_list (t
, stmt_p
);
4129 /* Add FIRSTPRIVATE entries for DECL in the OpenMP the surrounding parallels
4130 to CTX. If entries already exist, force them to be some flavor of private.
4131 If there is no enclosing parallel, do nothing. */
4134 omp_firstprivatize_variable (struct gimplify_omp_ctx
*ctx
, tree decl
)
4138 if (decl
== NULL
|| !DECL_P (decl
))
4143 n
= splay_tree_lookup (ctx
->variables
, (splay_tree_key
)decl
);
4146 if (n
->value
& GOVD_SHARED
)
4147 n
->value
= GOVD_FIRSTPRIVATE
| (n
->value
& GOVD_SEEN
);
4151 else if (ctx
->is_parallel
)
4152 omp_add_variable (ctx
, decl
, GOVD_FIRSTPRIVATE
);
4154 ctx
= ctx
->outer_context
;
4159 /* Similarly for each of the type sizes of TYPE. */
4162 omp_firstprivatize_type_sizes (struct gimplify_omp_ctx
*ctx
, tree type
)
4164 if (type
== NULL
|| type
== error_mark_node
)
4166 type
= TYPE_MAIN_VARIANT (type
);
4168 if (pointer_set_insert (ctx
->privatized_types
, type
))
4171 switch (TREE_CODE (type
))
4178 omp_firstprivatize_variable (ctx
, TYPE_MIN_VALUE (type
));
4179 omp_firstprivatize_variable (ctx
, TYPE_MAX_VALUE (type
));
4183 omp_firstprivatize_type_sizes (ctx
, TREE_TYPE (type
));
4184 omp_firstprivatize_type_sizes (ctx
, TYPE_DOMAIN (type
));
4189 case QUAL_UNION_TYPE
:
4192 for (field
= TYPE_FIELDS (type
); field
; field
= TREE_CHAIN (field
))
4193 if (TREE_CODE (field
) == FIELD_DECL
)
4195 omp_firstprivatize_variable (ctx
, DECL_FIELD_OFFSET (field
));
4196 omp_firstprivatize_type_sizes (ctx
, TREE_TYPE (field
));
4202 case REFERENCE_TYPE
:
4203 omp_firstprivatize_type_sizes (ctx
, TREE_TYPE (type
));
4210 omp_firstprivatize_variable (ctx
, TYPE_SIZE (type
));
4211 omp_firstprivatize_variable (ctx
, TYPE_SIZE_UNIT (type
));
4212 lang_hooks
.types
.omp_firstprivatize_type_sizes (ctx
, type
);
4215 /* Add an entry for DECL in the OpenMP context CTX with FLAGS. */
4218 omp_add_variable (struct gimplify_omp_ctx
*ctx
, tree decl
, unsigned int flags
)
4221 unsigned int nflags
;
4224 if (decl
== error_mark_node
|| TREE_TYPE (decl
) == error_mark_node
)
4227 /* Never elide decls whose type has TREE_ADDRESSABLE set. This means
4228 there are constructors involved somewhere. */
4229 if (TREE_ADDRESSABLE (TREE_TYPE (decl
))
4230 || TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl
)))
4233 n
= splay_tree_lookup (ctx
->variables
, (splay_tree_key
)decl
);
4236 /* We shouldn't be re-adding the decl with the same data
4238 gcc_assert ((n
->value
& GOVD_DATA_SHARE_CLASS
& flags
) == 0);
4239 /* The only combination of data sharing classes we should see is
4240 FIRSTPRIVATE and LASTPRIVATE. */
4241 nflags
= n
->value
| flags
;
4242 gcc_assert ((nflags
& GOVD_DATA_SHARE_CLASS
)
4243 == (GOVD_FIRSTPRIVATE
| GOVD_LASTPRIVATE
));
4248 /* When adding a variable-sized variable, we have to handle all sorts
4249 of additional bits of data: the pointer replacement variable, and
4250 the parameters of the type. */
4251 if (!TREE_CONSTANT (DECL_SIZE (decl
)))
4253 /* Add the pointer replacement variable as PRIVATE if the variable
4254 replacement is private, else FIRSTPRIVATE since we'll need the
4255 address of the original variable either for SHARED, or for the
4256 copy into or out of the context. */
4257 if (!(flags
& GOVD_LOCAL
))
4259 nflags
= flags
& GOVD_PRIVATE
? GOVD_PRIVATE
: GOVD_FIRSTPRIVATE
;
4260 nflags
|= flags
& GOVD_SEEN
;
4261 t
= DECL_VALUE_EXPR (decl
);
4262 gcc_assert (TREE_CODE (t
) == INDIRECT_REF
);
4263 t
= TREE_OPERAND (t
, 0);
4264 gcc_assert (DECL_P (t
));
4265 omp_add_variable (ctx
, t
, nflags
);
4268 /* Add all of the variable and type parameters (which should have
4269 been gimplified to a formal temporary) as FIRSTPRIVATE. */
4270 omp_firstprivatize_variable (ctx
, DECL_SIZE_UNIT (decl
));
4271 omp_firstprivatize_variable (ctx
, DECL_SIZE (decl
));
4272 omp_firstprivatize_type_sizes (ctx
, TREE_TYPE (decl
));
4274 /* The variable-sized variable itself is never SHARED, only some form
4275 of PRIVATE. The sharing would take place via the pointer variable
4276 which we remapped above. */
4277 if (flags
& GOVD_SHARED
)
4278 flags
= GOVD_PRIVATE
| GOVD_DEBUG_PRIVATE
4279 | (flags
& (GOVD_SEEN
| GOVD_EXPLICIT
));
4281 /* We're going to make use of the TYPE_SIZE_UNIT at least in the
4282 alloca statement we generate for the variable, so make sure it
4283 is available. This isn't automatically needed for the SHARED
4284 case, since we won't be allocating local storage then. */
4286 omp_notice_variable (ctx
, TYPE_SIZE_UNIT (TREE_TYPE (decl
)), true);
4288 else if (lang_hooks
.decls
.omp_privatize_by_reference (decl
))
4290 gcc_assert ((flags
& GOVD_LOCAL
) == 0);
4291 omp_firstprivatize_type_sizes (ctx
, TREE_TYPE (decl
));
4293 /* Similar to the direct variable sized case above, we'll need the
4294 size of references being privatized. */
4295 if ((flags
& GOVD_SHARED
) == 0)
4297 t
= TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (decl
)));
4298 if (!TREE_CONSTANT (t
))
4299 omp_notice_variable (ctx
, t
, true);
4303 splay_tree_insert (ctx
->variables
, (splay_tree_key
)decl
, flags
);
4306 /* Record the fact that DECL was used within the OpenMP context CTX.
4307 IN_CODE is true when real code uses DECL, and false when we should
4308 merely emit default(none) errors. Return true if DECL is going to
4309 be remapped and thus DECL shouldn't be gimplified into its
4310 DECL_VALUE_EXPR (if any). */
4313 omp_notice_variable (struct gimplify_omp_ctx
*ctx
, tree decl
, bool in_code
)
4316 unsigned flags
= in_code
? GOVD_SEEN
: 0;
4317 bool ret
= false, shared
;
4319 if (decl
== error_mark_node
|| TREE_TYPE (decl
) == error_mark_node
)
4322 /* Threadprivate variables are predetermined. */
4323 if (is_global_var (decl
))
4325 if (DECL_THREAD_LOCAL_P (decl
))
4328 if (DECL_HAS_VALUE_EXPR_P (decl
))
4330 tree value
= get_base_address (DECL_VALUE_EXPR (decl
));
4332 if (value
&& DECL_P (value
) && DECL_THREAD_LOCAL_P (value
))
4337 n
= splay_tree_lookup (ctx
->variables
, (splay_tree_key
)decl
);
4340 enum omp_clause_default_kind default_kind
, kind
;
4342 if (!ctx
->is_parallel
)
4345 /* ??? Some compiler-generated variables (like SAVE_EXPRs) could be
4346 remapped firstprivate instead of shared. To some extent this is
4347 addressed in omp_firstprivatize_type_sizes, but not effectively. */
4348 default_kind
= ctx
->default_kind
;
4349 kind
= lang_hooks
.decls
.omp_predetermined_sharing (decl
);
4350 if (kind
!= OMP_CLAUSE_DEFAULT_UNSPECIFIED
)
4351 default_kind
= kind
;
4353 switch (default_kind
)
4355 case OMP_CLAUSE_DEFAULT_NONE
:
4356 error ("%qs not specified in enclosing parallel",
4357 IDENTIFIER_POINTER (DECL_NAME (decl
)));
4358 error ("%Henclosing parallel", &ctx
->location
);
4360 case OMP_CLAUSE_DEFAULT_SHARED
:
4361 flags
|= GOVD_SHARED
;
4363 case OMP_CLAUSE_DEFAULT_PRIVATE
:
4364 flags
|= GOVD_PRIVATE
;
4370 omp_add_variable (ctx
, decl
, flags
);
4372 shared
= (flags
& GOVD_SHARED
) != 0;
4373 ret
= lang_hooks
.decls
.omp_disregard_value_expr (decl
, shared
);
4377 shared
= ((flags
| n
->value
) & GOVD_SHARED
) != 0;
4378 ret
= lang_hooks
.decls
.omp_disregard_value_expr (decl
, shared
);
4380 /* If nothing changed, there's nothing left to do. */
4381 if ((n
->value
& flags
) == flags
)
4387 /* If the variable is private in the current context, then we don't
4388 need to propagate anything to an outer context. */
4389 if (flags
& GOVD_PRIVATE
)
4391 if (ctx
->outer_context
4392 && omp_notice_variable (ctx
->outer_context
, decl
, in_code
))
4397 /* Verify that DECL is private within CTX. If there's specific information
4398 to the contrary in the innermost scope, generate an error. */
4401 omp_is_private (struct gimplify_omp_ctx
*ctx
, tree decl
)
4405 n
= splay_tree_lookup (ctx
->variables
, (splay_tree_key
)decl
);
4408 if (n
->value
& GOVD_SHARED
)
4410 if (ctx
== gimplify_omp_ctxp
)
4411 error ("iteration variable %qs should be private",
4412 IDENTIFIER_POINTER (DECL_NAME (decl
)));
4413 n
->value
= GOVD_PRIVATE
;
4418 if (ctx
->outer_context
)
4419 return omp_is_private (ctx
->outer_context
, decl
);
4420 else if (ctx
->is_parallel
)
4423 return !is_global_var (decl
);
4426 /* Scan the OpenMP clauses in *LIST_P, installing mappings into a new
4427 and previous omp contexts. */
4430 gimplify_scan_omp_clauses (tree
*list_p
, tree
*pre_p
, bool in_parallel
)
4432 struct gimplify_omp_ctx
*ctx
, *outer_ctx
;
4435 ctx
= new_omp_context (in_parallel
);
4436 outer_ctx
= ctx
->outer_context
;
4438 while ((c
= *list_p
) != NULL
)
4440 enum gimplify_status gs
;
4441 bool remove
= false;
4442 bool notice_outer
= true;
4446 switch (TREE_CODE (c
))
4448 case OMP_CLAUSE_PRIVATE
:
4449 flags
= GOVD_PRIVATE
| GOVD_EXPLICIT
;
4450 notice_outer
= false;
4452 case OMP_CLAUSE_SHARED
:
4453 flags
= GOVD_SHARED
| GOVD_EXPLICIT
;
4455 case OMP_CLAUSE_FIRSTPRIVATE
:
4456 flags
= GOVD_FIRSTPRIVATE
| GOVD_EXPLICIT
;
4458 case OMP_CLAUSE_LASTPRIVATE
:
4459 flags
= GOVD_LASTPRIVATE
| GOVD_SEEN
| GOVD_EXPLICIT
;
4461 case OMP_CLAUSE_REDUCTION
:
4462 flags
= GOVD_REDUCTION
| GOVD_SEEN
| GOVD_EXPLICIT
;
4466 decl
= OMP_CLAUSE_DECL (c
);
4467 if (decl
== error_mark_node
|| TREE_TYPE (decl
) == error_mark_node
)
4472 omp_add_variable (ctx
, decl
, flags
);
4473 if (TREE_CODE (c
) == OMP_CLAUSE_REDUCTION
4474 && OMP_CLAUSE_REDUCTION_PLACEHOLDER (c
))
4476 omp_add_variable (ctx
, OMP_CLAUSE_REDUCTION_PLACEHOLDER (c
),
4478 gimplify_omp_ctxp
= ctx
;
4479 push_gimplify_context ();
4480 gimplify_stmt (&OMP_CLAUSE_REDUCTION_INIT (c
));
4481 pop_gimplify_context (OMP_CLAUSE_REDUCTION_INIT (c
));
4482 push_gimplify_context ();
4483 gimplify_stmt (&OMP_CLAUSE_REDUCTION_MERGE (c
));
4484 pop_gimplify_context (OMP_CLAUSE_REDUCTION_MERGE (c
));
4485 gimplify_omp_ctxp
= outer_ctx
;
4491 case OMP_CLAUSE_COPYIN
:
4492 case OMP_CLAUSE_COPYPRIVATE
:
4493 decl
= OMP_CLAUSE_DECL (c
);
4494 if (decl
== error_mark_node
|| TREE_TYPE (decl
) == error_mark_node
)
4501 omp_notice_variable (outer_ctx
, decl
, true);
4504 case OMP_CLAUSE_SCHEDULE
:
4506 case OMP_CLAUSE_NUM_THREADS
:
4507 gs
= gimplify_expr (&TREE_OPERAND (c
, 0), pre_p
, NULL
,
4508 is_gimple_val
, fb_rvalue
);
4513 case OMP_CLAUSE_NOWAIT
:
4514 case OMP_CLAUSE_ORDERED
:
4517 case OMP_CLAUSE_DEFAULT
:
4518 ctx
->default_kind
= OMP_CLAUSE_DEFAULT_KIND (c
);
4526 *list_p
= OMP_CLAUSE_CHAIN (c
);
4528 list_p
= &OMP_CLAUSE_CHAIN (c
);
4531 gimplify_omp_ctxp
= ctx
;
4534 /* For all variables that were not actually used within the context,
4535 remove PRIVATE, SHARED, and FIRSTPRIVATE clauses. */
4538 gimplify_adjust_omp_clauses_1 (splay_tree_node n
, void *data
)
4540 tree
*list_p
= (tree
*) data
;
4541 tree decl
= (tree
) n
->key
;
4542 unsigned flags
= n
->value
;
4543 enum tree_code code
;
4547 if (flags
& (GOVD_EXPLICIT
| GOVD_LOCAL
))
4549 if ((flags
& GOVD_SEEN
) == 0)
4551 if (flags
& GOVD_DEBUG_PRIVATE
)
4553 gcc_assert ((flags
& GOVD_DATA_SHARE_CLASS
) == GOVD_PRIVATE
);
4554 private_debug
= true;
4558 = lang_hooks
.decls
.omp_private_debug_clause (decl
,
4559 !!(flags
& GOVD_SHARED
));
4561 code
= OMP_CLAUSE_PRIVATE
;
4562 else if (flags
& GOVD_SHARED
)
4564 if (is_global_var (decl
))
4566 code
= OMP_CLAUSE_SHARED
;
4568 else if (flags
& GOVD_PRIVATE
)
4569 code
= OMP_CLAUSE_PRIVATE
;
4570 else if (flags
& GOVD_FIRSTPRIVATE
)
4571 code
= OMP_CLAUSE_FIRSTPRIVATE
;
4575 clause
= build1 (code
, void_type_node
, decl
);
4576 OMP_CLAUSE_CHAIN (clause
) = *list_p
;
4578 OMP_CLAUSE_PRIVATE_DEBUG (clause
) = 1;
4585 gimplify_adjust_omp_clauses (tree
*list_p
)
4587 struct gimplify_omp_ctx
*ctx
= gimplify_omp_ctxp
;
4590 while ((c
= *list_p
) != NULL
)
4593 bool remove
= false;
4595 switch (TREE_CODE (c
))
4597 case OMP_CLAUSE_PRIVATE
:
4598 case OMP_CLAUSE_SHARED
:
4599 case OMP_CLAUSE_FIRSTPRIVATE
:
4600 decl
= OMP_CLAUSE_DECL (c
);
4601 n
= splay_tree_lookup (ctx
->variables
, (splay_tree_key
) decl
);
4602 remove
= !(n
->value
& GOVD_SEEN
);
4605 bool shared
= TREE_CODE (c
) == OMP_CLAUSE_SHARED
;
4606 if ((n
->value
& GOVD_DEBUG_PRIVATE
)
4607 || lang_hooks
.decls
.omp_private_debug_clause (decl
, shared
))
4609 gcc_assert ((n
->value
& GOVD_DEBUG_PRIVATE
) == 0
4610 || ((n
->value
& GOVD_DATA_SHARE_CLASS
)
4612 TREE_SET_CODE (c
, OMP_CLAUSE_PRIVATE
);
4613 OMP_CLAUSE_PRIVATE_DEBUG (c
) = 1;
4618 case OMP_CLAUSE_LASTPRIVATE
:
4619 /* Make sure OMP_CLAUSE_LASTPRIVATE_FIRSTPRIVATE is set to
4620 accurately reflect the presence of a FIRSTPRIVATE clause. */
4621 decl
= OMP_CLAUSE_DECL (c
);
4622 n
= splay_tree_lookup (ctx
->variables
, (splay_tree_key
) decl
);
4623 OMP_CLAUSE_LASTPRIVATE_FIRSTPRIVATE (c
)
4624 = (n
->value
& GOVD_FIRSTPRIVATE
) != 0;
4627 case OMP_CLAUSE_REDUCTION
:
4628 case OMP_CLAUSE_COPYIN
:
4629 case OMP_CLAUSE_COPYPRIVATE
:
4631 case OMP_CLAUSE_NUM_THREADS
:
4632 case OMP_CLAUSE_SCHEDULE
:
4633 case OMP_CLAUSE_NOWAIT
:
4634 case OMP_CLAUSE_ORDERED
:
4635 case OMP_CLAUSE_DEFAULT
:
4643 *list_p
= OMP_CLAUSE_CHAIN (c
);
4645 list_p
= &OMP_CLAUSE_CHAIN (c
);
4648 /* Add in any implicit data sharing. */
4649 splay_tree_foreach (ctx
->variables
, gimplify_adjust_omp_clauses_1
, list_p
);
4651 gimplify_omp_ctxp
= ctx
->outer_context
;
4652 delete_omp_context (ctx
);
4655 /* Gimplify the contents of an OMP_PARALLEL statement. This involves
4656 gimplification of the body, as well as scanning the body for used
4657 variables. We need to do this scan now, because variable-sized
4658 decls will be decomposed during gimplification. */
4660 static enum gimplify_status
4661 gimplify_omp_parallel (tree
*expr_p
, tree
*pre_p
)
4663 tree expr
= *expr_p
;
4665 gimplify_scan_omp_clauses (&OMP_PARALLEL_CLAUSES (expr
), pre_p
, true);
4667 push_gimplify_context ();
4669 gimplify_stmt (&OMP_PARALLEL_BODY (expr
));
4671 if (TREE_CODE (OMP_PARALLEL_BODY (expr
)) == BIND_EXPR
)
4672 pop_gimplify_context (OMP_PARALLEL_BODY (expr
));
4674 pop_gimplify_context (NULL_TREE
);
4676 gimplify_adjust_omp_clauses (&OMP_PARALLEL_CLAUSES (expr
));
4681 /* Gimplify the gross structure of an OMP_FOR statement. */
4683 static enum gimplify_status
4684 gimplify_omp_for (tree
*expr_p
, tree
*pre_p
)
4686 tree for_stmt
, decl
, t
;
4687 enum gimplify_status ret
= 0;
4691 gimplify_scan_omp_clauses (&OMP_FOR_CLAUSES (for_stmt
), pre_p
, false);
4693 t
= OMP_FOR_INIT (for_stmt
);
4694 gcc_assert (TREE_CODE (t
) == MODIFY_EXPR
);
4695 decl
= TREE_OPERAND (t
, 0);
4696 gcc_assert (DECL_P (decl
));
4697 gcc_assert (INTEGRAL_TYPE_P (TREE_TYPE (decl
)));
4698 gcc_assert (!TYPE_UNSIGNED (TREE_TYPE (decl
)));
4700 /* Make sure the iteration variable is private. */
4701 if (omp_is_private (gimplify_omp_ctxp
, decl
))
4702 omp_notice_variable (gimplify_omp_ctxp
, decl
, true);
4704 omp_add_variable (gimplify_omp_ctxp
, decl
, GOVD_PRIVATE
| GOVD_SEEN
);
4706 ret
|= gimplify_expr (&TREE_OPERAND (t
, 1), &OMP_FOR_PRE_BODY (for_stmt
),
4707 NULL
, is_gimple_val
, fb_rvalue
);
4709 t
= OMP_FOR_COND (for_stmt
);
4710 gcc_assert (COMPARISON_CLASS_P (t
));
4711 gcc_assert (TREE_OPERAND (t
, 0) == decl
);
4713 ret
|= gimplify_expr (&TREE_OPERAND (t
, 1), &OMP_FOR_PRE_BODY (for_stmt
),
4714 NULL
, is_gimple_val
, fb_rvalue
);
4716 t
= OMP_FOR_INCR (for_stmt
);
4717 switch (TREE_CODE (t
))
4719 case PREINCREMENT_EXPR
:
4720 case POSTINCREMENT_EXPR
:
4721 t
= build_int_cst (TREE_TYPE (decl
), 1);
4723 case PREDECREMENT_EXPR
:
4724 case POSTDECREMENT_EXPR
:
4725 t
= build_int_cst (TREE_TYPE (decl
), -1);
4728 t
= build2 (PLUS_EXPR
, TREE_TYPE (decl
), decl
, t
);
4729 t
= build2 (MODIFY_EXPR
, void_type_node
, decl
, t
);
4730 OMP_FOR_INCR (for_stmt
) = t
;
4734 gcc_assert (TREE_OPERAND (t
, 0) == decl
);
4735 t
= TREE_OPERAND (t
, 1);
4736 switch (TREE_CODE (t
))
4739 if (TREE_OPERAND (t
, 1) == decl
)
4741 TREE_OPERAND (t
, 1) = TREE_OPERAND (t
, 0);
4742 TREE_OPERAND (t
, 0) = decl
;
4746 gcc_assert (TREE_OPERAND (t
, 0) == decl
);
4752 ret
|= gimplify_expr (&TREE_OPERAND (t
, 1), &OMP_FOR_PRE_BODY (for_stmt
),
4753 NULL
, is_gimple_val
, fb_rvalue
);
4760 gimplify_to_stmt_list (&OMP_FOR_BODY (for_stmt
));
4761 gimplify_adjust_omp_clauses (&OMP_FOR_CLAUSES (for_stmt
));
4763 return ret
== GS_ALL_DONE
? GS_ALL_DONE
: GS_ERROR
;
4766 /* Gimplify the gross structure of other OpenMP worksharing constructs.
4767 In particular, OMP_SECTIONS and OMP_SINGLE. */
4769 static enum gimplify_status
4770 gimplify_omp_workshare (tree
*expr_p
, tree
*pre_p
)
4772 tree stmt
= *expr_p
;
4774 gimplify_scan_omp_clauses (&OMP_CLAUSES (stmt
), pre_p
, false);
4775 gimplify_to_stmt_list (&OMP_BODY (stmt
));
4776 gimplify_adjust_omp_clauses (&OMP_CLAUSES (stmt
));
4781 /* A subroutine of gimplify_omp_atomic. The front end is supposed to have
4782 stabilized the lhs of the atomic operation as *ADDR. Return true if
4783 EXPR is this stabilized form. */
4786 goa_lhs_expr_p (tree expr
, tree addr
)
4788 /* Also include casts to other type variants. The C front end is fond
4789 of adding these for e.g. volatile variables. This is like
4790 STRIP_TYPE_NOPS but includes the main variant lookup. */
4791 while ((TREE_CODE (expr
) == NOP_EXPR
4792 || TREE_CODE (expr
) == CONVERT_EXPR
4793 || TREE_CODE (expr
) == NON_LVALUE_EXPR
)
4794 && TREE_OPERAND (expr
, 0) != error_mark_node
4795 && (TYPE_MAIN_VARIANT (TREE_TYPE (expr
))
4796 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_OPERAND (expr
, 0)))))
4797 expr
= TREE_OPERAND (expr
, 0);
4799 if (TREE_CODE (expr
) == INDIRECT_REF
&& TREE_OPERAND (expr
, 0) == addr
)
4801 if (TREE_CODE (addr
) == ADDR_EXPR
&& expr
== TREE_OPERAND (addr
, 0))
4806 /* A subroutine of gimplify_omp_atomic. Attempt to implement the atomic
4807 operation as a __sync_fetch_and_op builtin. INDEX is log2 of the
4808 size of the data type, and thus usable to find the index of the builtin
4809 decl. Returns GS_UNHANDLED if the expression is not of the proper form. */
4811 static enum gimplify_status
4812 gimplify_omp_atomic_fetch_op (tree
*expr_p
, tree addr
, tree rhs
, int index
)
4814 enum built_in_function base
;
4815 tree decl
, args
, itype
;
4816 enum insn_code
*optab
;
4818 /* Check for one of the supported fetch-op operations. */
4819 switch (TREE_CODE (rhs
))
4822 base
= BUILT_IN_FETCH_AND_ADD_N
;
4823 optab
= sync_add_optab
;
4826 base
= BUILT_IN_FETCH_AND_SUB_N
;
4827 optab
= sync_add_optab
;
4830 base
= BUILT_IN_FETCH_AND_AND_N
;
4831 optab
= sync_and_optab
;
4834 base
= BUILT_IN_FETCH_AND_OR_N
;
4835 optab
= sync_ior_optab
;
4838 base
= BUILT_IN_FETCH_AND_XOR_N
;
4839 optab
= sync_xor_optab
;
4842 return GS_UNHANDLED
;
4845 /* Make sure the expression is of the proper form. */
4846 if (goa_lhs_expr_p (TREE_OPERAND (rhs
, 0), addr
))
4847 rhs
= TREE_OPERAND (rhs
, 1);
4848 else if (commutative_tree_code (TREE_CODE (rhs
))
4849 && goa_lhs_expr_p (TREE_OPERAND (rhs
, 1), addr
))
4850 rhs
= TREE_OPERAND (rhs
, 0);
4852 return GS_UNHANDLED
;
4854 decl
= built_in_decls
[base
+ index
+ 1];
4855 itype
= TREE_TYPE (TREE_TYPE (decl
));
4857 if (optab
[TYPE_MODE (itype
)] == CODE_FOR_nothing
)
4858 return GS_UNHANDLED
;
4860 args
= tree_cons (NULL
, fold_convert (itype
, rhs
), NULL
);
4861 args
= tree_cons (NULL
, addr
, args
);
4862 *expr_p
= build_function_call_expr (decl
, args
);
4866 /* A subroutine of gimplify_omp_atomic_pipeline. Walk *EXPR_P and replace
4867 appearences of *LHS_ADDR with LHS_VAR. If an expression does not involve
4868 the lhs, evaluate it into a temporary. Return 1 if the lhs appeared as
4869 a subexpression, 0 if it did not, or -1 if an error was encountered. */
4872 goa_stabilize_expr (tree
*expr_p
, tree
*pre_p
, tree lhs_addr
, tree lhs_var
)
4874 tree expr
= *expr_p
;
4877 if (goa_lhs_expr_p (expr
, lhs_addr
))
4882 if (is_gimple_val (expr
))
4886 switch (TREE_CODE_CLASS (TREE_CODE (expr
)))
4889 saw_lhs
|= goa_stabilize_expr (&TREE_OPERAND (expr
, 1), pre_p
,
4892 saw_lhs
|= goa_stabilize_expr (&TREE_OPERAND (expr
, 0), pre_p
,
4901 enum gimplify_status gs
;
4902 gs
= gimplify_expr (expr_p
, pre_p
, NULL
, is_gimple_val
, fb_rvalue
);
4903 if (gs
!= GS_ALL_DONE
)
4910 /* A subroutine of gimplify_omp_atomic. Implement the atomic operation as:
4914 newval = rhs; // with oldval replacing *addr in rhs
4915 oldval = __sync_val_compare_and_swap (addr, oldval, newval);
4916 if (oldval != newval)
4919 INDEX is log2 of the size of the data type, and thus usable to find the
4920 index of the builtin decl. */
4922 static enum gimplify_status
4923 gimplify_omp_atomic_pipeline (tree
*expr_p
, tree
*pre_p
, tree addr
,
4924 tree rhs
, int index
)
4926 tree oldval
, oldival
, oldival2
, newval
, newival
, label
;
4927 tree type
, itype
, cmpxchg
, args
, x
, iaddr
;
4929 cmpxchg
= built_in_decls
[BUILT_IN_VAL_COMPARE_AND_SWAP_N
+ index
+ 1];
4930 type
= TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (addr
)));
4931 itype
= TREE_TYPE (TREE_TYPE (cmpxchg
));
4933 if (sync_compare_and_swap
[TYPE_MODE (itype
)] == CODE_FOR_nothing
)
4934 return GS_UNHANDLED
;
4936 oldval
= create_tmp_var (type
, NULL
);
4937 newval
= create_tmp_var (type
, NULL
);
4939 /* Precompute as much of RHS as possible. In the same walk, replace
4940 occurrences of the lhs value with our temporary. */
4941 if (goa_stabilize_expr (&rhs
, pre_p
, addr
, oldval
) < 0)
4944 x
= build_fold_indirect_ref (addr
);
4945 x
= build2 (MODIFY_EXPR
, void_type_node
, oldval
, x
);
4946 gimplify_and_add (x
, pre_p
);
4948 /* For floating-point values, we'll need to view-convert them to integers
4949 so that we can perform the atomic compare and swap. Simplify the
4950 following code by always setting up the "i"ntegral variables. */
4951 if (INTEGRAL_TYPE_P (type
) || POINTER_TYPE_P (type
))
4959 oldival
= create_tmp_var (itype
, NULL
);
4960 newival
= create_tmp_var (itype
, NULL
);
4962 x
= build1 (VIEW_CONVERT_EXPR
, itype
, oldval
);
4963 x
= build2 (MODIFY_EXPR
, void_type_node
, oldival
, x
);
4964 gimplify_and_add (x
, pre_p
);
4965 iaddr
= fold_convert (build_pointer_type (itype
), addr
);
4968 oldival2
= create_tmp_var (itype
, NULL
);
4970 label
= create_artificial_label ();
4971 x
= build1 (LABEL_EXPR
, void_type_node
, label
);
4972 gimplify_and_add (x
, pre_p
);
4974 x
= build2 (MODIFY_EXPR
, void_type_node
, newval
, rhs
);
4975 gimplify_and_add (x
, pre_p
);
4977 if (newval
!= newival
)
4979 x
= build1 (VIEW_CONVERT_EXPR
, itype
, newval
);
4980 x
= build2 (MODIFY_EXPR
, void_type_node
, newival
, x
);
4981 gimplify_and_add (x
, pre_p
);
4984 x
= build2 (MODIFY_EXPR
, void_type_node
, oldival2
, oldival
);
4985 gimplify_and_add (x
, pre_p
);
4987 args
= tree_cons (NULL
, fold_convert (itype
, newival
), NULL
);
4988 args
= tree_cons (NULL
, fold_convert (itype
, oldival
), args
);
4989 args
= tree_cons (NULL
, iaddr
, args
);
4990 x
= build_function_call_expr (cmpxchg
, args
);
4991 if (oldval
== oldival
)
4992 x
= fold_convert (type
, x
);
4993 x
= build2 (MODIFY_EXPR
, void_type_node
, oldival
, x
);
4994 gimplify_and_add (x
, pre_p
);
4996 /* For floating point, be prepared for the loop backedge. */
4997 if (oldval
!= oldival
)
4999 x
= build1 (VIEW_CONVERT_EXPR
, type
, oldival
);
5000 x
= build2 (MODIFY_EXPR
, void_type_node
, oldval
, x
);
5001 gimplify_and_add (x
, pre_p
);
5004 /* Note that we always perform the comparison as an integer, even for
5005 floating point. This allows the atomic operation to properly
5006 succeed even with NaNs and -0.0. */
5007 x
= build3 (COND_EXPR
, void_type_node
,
5008 build2 (NE_EXPR
, boolean_type_node
, oldival
, oldival2
),
5009 build1 (GOTO_EXPR
, void_type_node
, label
), NULL
);
5010 gimplify_and_add (x
, pre_p
);
5016 /* A subroutine of gimplify_omp_atomic. Implement the atomic operation as:
5018 GOMP_atomic_start ();
5022 The result is not globally atomic, but works so long as all parallel
5023 references are within #pragma omp atomic directives. According to
5024 responses received from omp@openmp.org, appears to be within spec.
5025 Which makes sense, since that's how several other compilers handle
5026 this situation as well. */
5028 static enum gimplify_status
5029 gimplify_omp_atomic_mutex (tree
*expr_p
, tree
*pre_p
, tree addr
, tree rhs
)
5033 t
= built_in_decls
[BUILT_IN_GOMP_ATOMIC_START
];
5034 t
= build_function_call_expr (t
, NULL
);
5035 gimplify_and_add (t
, pre_p
);
5037 t
= build_fold_indirect_ref (addr
);
5038 t
= build2 (MODIFY_EXPR
, void_type_node
, t
, rhs
);
5039 gimplify_and_add (t
, pre_p
);
5041 t
= built_in_decls
[BUILT_IN_GOMP_ATOMIC_END
];
5042 t
= build_function_call_expr (t
, NULL
);
5043 gimplify_and_add (t
, pre_p
);
5049 /* Gimplify an OMP_ATOMIC statement. */
5051 static enum gimplify_status
5052 gimplify_omp_atomic (tree
*expr_p
, tree
*pre_p
)
5054 tree addr
= TREE_OPERAND (*expr_p
, 0);
5055 tree rhs
= TREE_OPERAND (*expr_p
, 1);
5056 tree type
= TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (addr
)));
5057 HOST_WIDE_INT index
;
5059 /* Make sure the type is one of the supported sizes. */
5060 index
= tree_low_cst (TYPE_SIZE_UNIT (type
), 1);
5061 index
= exact_log2 (index
);
5062 if (index
>= 0 && index
<= 4)
5064 enum gimplify_status gs
;
5067 if (DECL_P (TREE_OPERAND (addr
, 0)))
5068 align
= DECL_ALIGN_UNIT (TREE_OPERAND (addr
, 0));
5069 else if (TREE_CODE (TREE_OPERAND (addr
, 0)) == COMPONENT_REF
5070 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (addr
, 0), 1))
5072 align
= DECL_ALIGN_UNIT (TREE_OPERAND (TREE_OPERAND (addr
, 0), 1));
5074 align
= TYPE_ALIGN_UNIT (type
);
5076 /* __sync builtins require strict data alignment. */
5077 if (exact_log2 (align
) >= index
)
5079 /* When possible, use specialized atomic update functions. */
5080 if (INTEGRAL_TYPE_P (type
) || POINTER_TYPE_P (type
))
5082 gs
= gimplify_omp_atomic_fetch_op (expr_p
, addr
, rhs
, index
);
5083 if (gs
!= GS_UNHANDLED
)
5087 /* If we don't have specialized __sync builtins, try and implement
5088 as a compare and swap loop. */
5089 gs
= gimplify_omp_atomic_pipeline (expr_p
, pre_p
, addr
, rhs
, index
);
5090 if (gs
!= GS_UNHANDLED
)
5095 /* The ultimate fallback is wrapping the operation in a mutex. */
5096 return gimplify_omp_atomic_mutex (expr_p
, pre_p
, addr
, rhs
);
5099 /* Gimplifies the expression tree pointed to by EXPR_P. Return 0 if
5100 gimplification failed.
5102 PRE_P points to the list where side effects that must happen before
5103 EXPR should be stored.
5105 POST_P points to the list where side effects that must happen after
5106 EXPR should be stored, or NULL if there is no suitable list. In
5107 that case, we copy the result to a temporary, emit the
5108 post-effects, and then return the temporary.
5110 GIMPLE_TEST_F points to a function that takes a tree T and
5111 returns nonzero if T is in the GIMPLE form requested by the
5112 caller. The GIMPLE predicates are in tree-gimple.c.
5114 This test is used twice. Before gimplification, the test is
5115 invoked to determine whether *EXPR_P is already gimple enough. If
5116 that fails, *EXPR_P is gimplified according to its code and
5117 GIMPLE_TEST_F is called again. If the test still fails, then a new
5118 temporary variable is created and assigned the value of the
5119 gimplified expression.
5121 FALLBACK tells the function what sort of a temporary we want. If the 1
5122 bit is set, an rvalue is OK. If the 2 bit is set, an lvalue is OK.
5123 If both are set, either is OK, but an lvalue is preferable.
5125 The return value is either GS_ERROR or GS_ALL_DONE, since this function
5126 iterates until solution. */
5128 enum gimplify_status
5129 gimplify_expr (tree
*expr_p
, tree
*pre_p
, tree
*post_p
,
5130 bool (* gimple_test_f
) (tree
), fallback_t fallback
)
5133 tree internal_pre
= NULL_TREE
;
5134 tree internal_post
= NULL_TREE
;
5136 int is_statement
= (pre_p
== NULL
);
5137 location_t saved_location
;
5138 enum gimplify_status ret
;
5140 save_expr
= *expr_p
;
5141 if (save_expr
== NULL_TREE
)
5144 /* We used to check the predicate here and return immediately if it
5145 succeeds. This is wrong; the design is for gimplification to be
5146 idempotent, and for the predicates to only test for valid forms, not
5147 whether they are fully simplified. */
5149 /* Set up our internal queues if needed. */
5151 pre_p
= &internal_pre
;
5153 post_p
= &internal_post
;
5155 saved_location
= input_location
;
5156 if (save_expr
!= error_mark_node
5157 && EXPR_HAS_LOCATION (*expr_p
))
5158 input_location
= EXPR_LOCATION (*expr_p
);
5160 /* Loop over the specific gimplifiers until the toplevel node
5161 remains the same. */
5164 /* Strip away as many useless type conversions as possible
5166 STRIP_USELESS_TYPE_CONVERSION (*expr_p
);
5168 /* Remember the expr. */
5169 save_expr
= *expr_p
;
5171 /* Die, die, die, my darling. */
5172 if (save_expr
== error_mark_node
5173 || (TREE_TYPE (save_expr
)
5174 && TREE_TYPE (save_expr
) == error_mark_node
))
5180 /* Do any language-specific gimplification. */
5181 ret
= lang_hooks
.gimplify_expr (expr_p
, pre_p
, post_p
);
5184 if (*expr_p
== NULL_TREE
)
5186 if (*expr_p
!= save_expr
)
5189 else if (ret
!= GS_UNHANDLED
)
5193 switch (TREE_CODE (*expr_p
))
5195 /* First deal with the special cases. */
5197 case POSTINCREMENT_EXPR
:
5198 case POSTDECREMENT_EXPR
:
5199 case PREINCREMENT_EXPR
:
5200 case PREDECREMENT_EXPR
:
5201 ret
= gimplify_self_mod_expr (expr_p
, pre_p
, post_p
,
5202 fallback
!= fb_none
);
5206 case ARRAY_RANGE_REF
:
5210 case VIEW_CONVERT_EXPR
:
5211 ret
= gimplify_compound_lval (expr_p
, pre_p
, post_p
,
5212 fallback
? fallback
: fb_rvalue
);
5216 ret
= gimplify_cond_expr (expr_p
, pre_p
, post_p
, NULL_TREE
,
5218 /* C99 code may assign to an array in a structure value of a
5219 conditional expression, and this has undefined behavior
5220 only on execution, so create a temporary if an lvalue is
5222 if (fallback
== fb_lvalue
)
5224 *expr_p
= get_initialized_tmp_var (*expr_p
, pre_p
, post_p
);
5225 lang_hooks
.mark_addressable (*expr_p
);
5230 ret
= gimplify_call_expr (expr_p
, pre_p
, fallback
!= fb_none
);
5231 /* C99 code may assign to an array in a structure returned
5232 from a function, and this has undefined behavior only on
5233 execution, so create a temporary if an lvalue is
5235 if (fallback
== fb_lvalue
)
5237 *expr_p
= get_initialized_tmp_var (*expr_p
, pre_p
, post_p
);
5238 lang_hooks
.mark_addressable (*expr_p
);
5246 ret
= gimplify_compound_expr (expr_p
, pre_p
, fallback
!= fb_none
);
5251 ret
= gimplify_modify_expr (expr_p
, pre_p
, post_p
,
5252 fallback
!= fb_none
);
5255 case TRUTH_ANDIF_EXPR
:
5256 case TRUTH_ORIF_EXPR
:
5257 ret
= gimplify_boolean_expr (expr_p
);
5260 case TRUTH_NOT_EXPR
:
5261 TREE_OPERAND (*expr_p
, 0)
5262 = gimple_boolify (TREE_OPERAND (*expr_p
, 0));
5263 ret
= gimplify_expr (&TREE_OPERAND (*expr_p
, 0), pre_p
, post_p
,
5264 is_gimple_val
, fb_rvalue
);
5265 recalculate_side_effects (*expr_p
);
5269 ret
= gimplify_addr_expr (expr_p
, pre_p
, post_p
);
5273 ret
= gimplify_va_arg_expr (expr_p
, pre_p
, post_p
);
5278 if (IS_EMPTY_STMT (*expr_p
))
5284 if (VOID_TYPE_P (TREE_TYPE (*expr_p
))
5285 || fallback
== fb_none
)
5287 /* Just strip a conversion to void (or in void context) and
5289 *expr_p
= TREE_OPERAND (*expr_p
, 0);
5293 ret
= gimplify_conversion (expr_p
);
5294 if (ret
== GS_ERROR
)
5296 if (*expr_p
!= save_expr
)
5300 case FIX_TRUNC_EXPR
:
5302 case FIX_FLOOR_EXPR
:
5303 case FIX_ROUND_EXPR
:
5304 /* unary_expr: ... | '(' cast ')' val | ... */
5305 ret
= gimplify_expr (&TREE_OPERAND (*expr_p
, 0), pre_p
, post_p
,
5306 is_gimple_val
, fb_rvalue
);
5307 recalculate_side_effects (*expr_p
);
5311 *expr_p
= fold_indirect_ref (*expr_p
);
5312 if (*expr_p
!= save_expr
)
5314 /* else fall through. */
5315 case ALIGN_INDIRECT_REF
:
5316 case MISALIGNED_INDIRECT_REF
:
5317 ret
= gimplify_expr (&TREE_OPERAND (*expr_p
, 0), pre_p
, post_p
,
5318 is_gimple_reg
, fb_rvalue
);
5319 recalculate_side_effects (*expr_p
);
5322 /* Constants need not be gimplified. */
5332 /* If we require an lvalue, such as for ADDR_EXPR, retain the
5333 CONST_DECL node. Otherwise the decl is replaceable by its
5335 /* ??? Should be == fb_lvalue, but ADDR_EXPR passes fb_either. */
5336 if (fallback
& fb_lvalue
)
5339 *expr_p
= DECL_INITIAL (*expr_p
);
5343 ret
= gimplify_decl_expr (expr_p
);
5347 /* FIXME make this a decl. */
5352 ret
= gimplify_bind_expr (expr_p
, NULL
, pre_p
);
5356 ret
= gimplify_loop_expr (expr_p
, pre_p
);
5360 ret
= gimplify_switch_expr (expr_p
, pre_p
);
5364 ret
= gimplify_exit_expr (expr_p
);
5368 /* If the target is not LABEL, then it is a computed jump
5369 and the target needs to be gimplified. */
5370 if (TREE_CODE (GOTO_DESTINATION (*expr_p
)) != LABEL_DECL
)
5371 ret
= gimplify_expr (&GOTO_DESTINATION (*expr_p
), pre_p
,
5372 NULL
, is_gimple_val
, fb_rvalue
);
5377 gcc_assert (decl_function_context (LABEL_EXPR_LABEL (*expr_p
))
5378 == current_function_decl
);
5381 case CASE_LABEL_EXPR
:
5382 ret
= gimplify_case_label_expr (expr_p
);
5386 ret
= gimplify_return_expr (*expr_p
, pre_p
);
5390 /* Don't reduce this in place; let gimplify_init_constructor work its
5391 magic. Buf if we're just elaborating this for side effects, just
5392 gimplify any element that has side-effects. */
5393 if (fallback
== fb_none
)
5395 unsigned HOST_WIDE_INT ix
;
5396 constructor_elt
*ce
;
5397 tree temp
= NULL_TREE
;
5399 VEC_iterate (constructor_elt
, CONSTRUCTOR_ELTS (*expr_p
),
5402 if (TREE_SIDE_EFFECTS (ce
->value
))
5403 append_to_statement_list (ce
->value
, &temp
);
5408 /* C99 code may assign to an array in a constructed
5409 structure or union, and this has undefined behavior only
5410 on execution, so create a temporary if an lvalue is
5412 else if (fallback
== fb_lvalue
)
5414 *expr_p
= get_initialized_tmp_var (*expr_p
, pre_p
, post_p
);
5415 lang_hooks
.mark_addressable (*expr_p
);
5421 /* The following are special cases that are not handled by the
5422 original GIMPLE grammar. */
5424 /* SAVE_EXPR nodes are converted into a GIMPLE identifier and
5427 ret
= gimplify_save_expr (expr_p
, pre_p
, post_p
);
5432 enum gimplify_status r0
, r1
, r2
;
5434 r0
= gimplify_expr (&TREE_OPERAND (*expr_p
, 0), pre_p
, post_p
,
5435 is_gimple_lvalue
, fb_either
);
5436 r1
= gimplify_expr (&TREE_OPERAND (*expr_p
, 1), pre_p
, post_p
,
5437 is_gimple_val
, fb_rvalue
);
5438 r2
= gimplify_expr (&TREE_OPERAND (*expr_p
, 2), pre_p
, post_p
,
5439 is_gimple_val
, fb_rvalue
);
5440 recalculate_side_effects (*expr_p
);
5442 ret
= MIN (r0
, MIN (r1
, r2
));
5446 case NON_LVALUE_EXPR
:
5447 /* This should have been stripped above. */
5451 ret
= gimplify_asm_expr (expr_p
, pre_p
, post_p
);
5454 case TRY_FINALLY_EXPR
:
5455 case TRY_CATCH_EXPR
:
5456 gimplify_to_stmt_list (&TREE_OPERAND (*expr_p
, 0));
5457 gimplify_to_stmt_list (&TREE_OPERAND (*expr_p
, 1));
5461 case CLEANUP_POINT_EXPR
:
5462 ret
= gimplify_cleanup_point_expr (expr_p
, pre_p
);
5466 ret
= gimplify_target_expr (expr_p
, pre_p
, post_p
);
5470 gimplify_to_stmt_list (&CATCH_BODY (*expr_p
));
5474 case EH_FILTER_EXPR
:
5475 gimplify_to_stmt_list (&EH_FILTER_FAILURE (*expr_p
));
5481 enum gimplify_status r0
, r1
;
5482 r0
= gimplify_expr (&OBJ_TYPE_REF_OBJECT (*expr_p
), pre_p
, post_p
,
5483 is_gimple_val
, fb_rvalue
);
5484 r1
= gimplify_expr (&OBJ_TYPE_REF_EXPR (*expr_p
), pre_p
, post_p
,
5485 is_gimple_val
, fb_rvalue
);
5491 /* We get here when taking the address of a label. We mark
5492 the label as "forced"; meaning it can never be removed and
5493 it is a potential target for any computed goto. */
5494 FORCED_LABEL (*expr_p
) = 1;
5498 case STATEMENT_LIST
:
5499 ret
= gimplify_statement_list (expr_p
);
5502 case WITH_SIZE_EXPR
:
5504 gimplify_expr (&TREE_OPERAND (*expr_p
, 0), pre_p
,
5505 post_p
== &internal_post
? NULL
: post_p
,
5506 gimple_test_f
, fallback
);
5507 gimplify_expr (&TREE_OPERAND (*expr_p
, 1), pre_p
, post_p
,
5508 is_gimple_val
, fb_rvalue
);
5514 ret
= gimplify_var_or_parm_decl (expr_p
);
5518 /* Allow callbacks into the gimplifier during optimization. */
5523 ret
= gimplify_omp_parallel (expr_p
, pre_p
);
5527 ret
= gimplify_omp_for (expr_p
, pre_p
);
5532 ret
= gimplify_omp_workshare (expr_p
, pre_p
);
5539 gimplify_to_stmt_list (&OMP_BODY (*expr_p
));
5543 ret
= gimplify_omp_atomic (expr_p
, pre_p
);
5546 case OMP_RETURN_EXPR
:
5551 switch (TREE_CODE_CLASS (TREE_CODE (*expr_p
)))
5553 case tcc_comparison
:
5554 /* If this is a comparison of objects of aggregate type,
5555 handle it specially (by converting to a call to
5556 memcmp). It would be nice to only have to do this
5557 for variable-sized objects, but then we'd have to
5558 allow the same nest of reference nodes we allow for
5559 MODIFY_EXPR and that's too complex. */
5560 if (!AGGREGATE_TYPE_P (TREE_TYPE (TREE_OPERAND (*expr_p
, 1))))
5562 ret
= gimplify_variable_sized_compare (expr_p
);
5565 /* If *EXPR_P does not need to be special-cased, handle it
5566 according to its class. */
5568 ret
= gimplify_expr (&TREE_OPERAND (*expr_p
, 0), pre_p
,
5569 post_p
, is_gimple_val
, fb_rvalue
);
5575 enum gimplify_status r0
, r1
;
5577 r0
= gimplify_expr (&TREE_OPERAND (*expr_p
, 0), pre_p
,
5578 post_p
, is_gimple_val
, fb_rvalue
);
5579 r1
= gimplify_expr (&TREE_OPERAND (*expr_p
, 1), pre_p
,
5580 post_p
, is_gimple_val
, fb_rvalue
);
5586 case tcc_declaration
:
5589 goto dont_recalculate
;
5592 gcc_assert (TREE_CODE (*expr_p
) == TRUTH_AND_EXPR
5593 || TREE_CODE (*expr_p
) == TRUTH_OR_EXPR
5594 || TREE_CODE (*expr_p
) == TRUTH_XOR_EXPR
);
5598 recalculate_side_effects (*expr_p
);
5603 /* If we replaced *expr_p, gimplify again. */
5604 if (ret
== GS_OK
&& (*expr_p
== NULL
|| *expr_p
== save_expr
))
5607 while (ret
== GS_OK
);
5609 /* If we encountered an error_mark somewhere nested inside, either
5610 stub out the statement or propagate the error back out. */
5611 if (ret
== GS_ERROR
)
5618 /* This was only valid as a return value from the langhook, which
5619 we handled. Make sure it doesn't escape from any other context. */
5620 gcc_assert (ret
!= GS_UNHANDLED
);
5622 if (fallback
== fb_none
&& *expr_p
&& !is_gimple_stmt (*expr_p
))
5624 /* We aren't looking for a value, and we don't have a valid
5625 statement. If it doesn't have side-effects, throw it away. */
5626 if (!TREE_SIDE_EFFECTS (*expr_p
))
5628 else if (!TREE_THIS_VOLATILE (*expr_p
))
5630 /* This is probably a _REF that contains something nested that
5631 has side effects. Recurse through the operands to find it. */
5632 enum tree_code code
= TREE_CODE (*expr_p
);
5637 case REALPART_EXPR
: case IMAGPART_EXPR
:
5638 gimplify_expr (&TREE_OPERAND (*expr_p
, 0), pre_p
, post_p
,
5639 gimple_test_f
, fallback
);
5642 case ARRAY_REF
: case ARRAY_RANGE_REF
:
5643 gimplify_expr (&TREE_OPERAND (*expr_p
, 0), pre_p
, post_p
,
5644 gimple_test_f
, fallback
);
5645 gimplify_expr (&TREE_OPERAND (*expr_p
, 1), pre_p
, post_p
,
5646 gimple_test_f
, fallback
);
5650 /* Anything else with side-effects must be converted to
5651 a valid statement before we get here. */
5657 else if (COMPLETE_TYPE_P (TREE_TYPE (*expr_p
)))
5659 /* Historically, the compiler has treated a bare
5660 reference to a volatile lvalue as forcing a load. */
5661 tree type
= TYPE_MAIN_VARIANT (TREE_TYPE (*expr_p
));
5662 /* Normally, we do want to create a temporary for a
5663 TREE_ADDRESSABLE type because such a type should not be
5664 copied by bitwise-assignment. However, we make an
5665 exception here, as all we are doing here is ensuring that
5666 we read the bytes that make up the type. We use
5667 create_tmp_var_raw because create_tmp_var will abort when
5668 given a TREE_ADDRESSABLE type. */
5669 tree tmp
= create_tmp_var_raw (type
, "vol");
5670 gimple_add_tmp_var (tmp
);
5671 *expr_p
= build2 (MODIFY_EXPR
, type
, tmp
, *expr_p
);
5674 /* We can't do anything useful with a volatile reference to
5675 incomplete type, so just throw it away. */
5679 /* If we are gimplifying at the statement level, we're done. Tack
5680 everything together and replace the original statement with the
5682 if (fallback
== fb_none
|| is_statement
)
5684 if (internal_pre
|| internal_post
)
5686 append_to_statement_list (*expr_p
, &internal_pre
);
5687 append_to_statement_list (internal_post
, &internal_pre
);
5688 annotate_all_with_locus (&internal_pre
, input_location
);
5689 *expr_p
= internal_pre
;
5693 else if (TREE_CODE (*expr_p
) == STATEMENT_LIST
)
5694 annotate_all_with_locus (expr_p
, input_location
);
5696 annotate_one_with_locus (*expr_p
, input_location
);
5700 /* Otherwise we're gimplifying a subexpression, so the resulting value is
5703 /* If it's sufficiently simple already, we're done. Unless we are
5704 handling some post-effects internally; if that's the case, we need to
5705 copy into a temp before adding the post-effects to the tree. */
5706 if (!internal_post
&& (*gimple_test_f
) (*expr_p
))
5709 /* Otherwise, we need to create a new temporary for the gimplified
5712 /* We can't return an lvalue if we have an internal postqueue. The
5713 object the lvalue refers to would (probably) be modified by the
5714 postqueue; we need to copy the value out first, which means an
5716 if ((fallback
& fb_lvalue
) && !internal_post
5717 && is_gimple_addressable (*expr_p
))
5719 /* An lvalue will do. Take the address of the expression, store it
5720 in a temporary, and replace the expression with an INDIRECT_REF of
5722 tmp
= build_fold_addr_expr (*expr_p
);
5723 gimplify_expr (&tmp
, pre_p
, post_p
, is_gimple_reg
, fb_rvalue
);
5724 *expr_p
= build1 (INDIRECT_REF
, TREE_TYPE (TREE_TYPE (tmp
)), tmp
);
5726 else if ((fallback
& fb_rvalue
) && is_gimple_formal_tmp_rhs (*expr_p
))
5728 gcc_assert (!VOID_TYPE_P (TREE_TYPE (*expr_p
)));
5730 /* An rvalue will do. Assign the gimplified expression into a new
5731 temporary TMP and replace the original expression with TMP. */
5733 if (internal_post
|| (fallback
& fb_lvalue
))
5734 /* The postqueue might change the value of the expression between
5735 the initialization and use of the temporary, so we can't use a
5736 formal temp. FIXME do we care? */
5737 *expr_p
= get_initialized_tmp_var (*expr_p
, pre_p
, post_p
);
5739 *expr_p
= get_formal_tmp_var (*expr_p
, pre_p
);
5741 if (TREE_CODE (*expr_p
) != SSA_NAME
)
5742 DECL_GIMPLE_FORMAL_TEMP_P (*expr_p
) = 1;
5746 #ifdef ENABLE_CHECKING
5747 if (!(fallback
& fb_mayfail
))
5749 fprintf (stderr
, "gimplification failed:\n");
5750 print_generic_expr (stderr
, *expr_p
, 0);
5751 debug_tree (*expr_p
);
5752 internal_error ("gimplification failed");
5755 gcc_assert (fallback
& fb_mayfail
);
5756 /* If this is an asm statement, and the user asked for the
5757 impossible, don't die. Fail and let gimplify_asm_expr
5763 /* Make sure the temporary matches our predicate. */
5764 gcc_assert ((*gimple_test_f
) (*expr_p
));
5768 annotate_all_with_locus (&internal_post
, input_location
);
5769 append_to_statement_list (internal_post
, pre_p
);
5773 input_location
= saved_location
;
5777 /* Look through TYPE for variable-sized objects and gimplify each such
5778 size that we find. Add to LIST_P any statements generated. */
5781 gimplify_type_sizes (tree type
, tree
*list_p
)
5785 if (type
== NULL
|| type
== error_mark_node
)
5788 /* We first do the main variant, then copy into any other variants. */
5789 type
= TYPE_MAIN_VARIANT (type
);
5791 /* Avoid infinite recursion. */
5792 if (TYPE_SIZES_GIMPLIFIED (type
))
5795 TYPE_SIZES_GIMPLIFIED (type
) = 1;
5797 switch (TREE_CODE (type
))
5804 gimplify_one_sizepos (&TYPE_MIN_VALUE (type
), list_p
);
5805 gimplify_one_sizepos (&TYPE_MAX_VALUE (type
), list_p
);
5807 for (t
= TYPE_NEXT_VARIANT (type
); t
; t
= TYPE_NEXT_VARIANT (t
))
5809 TYPE_MIN_VALUE (t
) = TYPE_MIN_VALUE (type
);
5810 TYPE_MAX_VALUE (t
) = TYPE_MAX_VALUE (type
);
5815 /* These types may not have declarations, so handle them here. */
5816 gimplify_type_sizes (TREE_TYPE (type
), list_p
);
5817 gimplify_type_sizes (TYPE_DOMAIN (type
), list_p
);
5822 case QUAL_UNION_TYPE
:
5823 for (field
= TYPE_FIELDS (type
); field
; field
= TREE_CHAIN (field
))
5824 if (TREE_CODE (field
) == FIELD_DECL
)
5826 gimplify_one_sizepos (&DECL_FIELD_OFFSET (field
), list_p
);
5827 gimplify_type_sizes (TREE_TYPE (field
), list_p
);
5832 case REFERENCE_TYPE
:
5833 gimplify_type_sizes (TREE_TYPE (type
), list_p
);
5840 gimplify_one_sizepos (&TYPE_SIZE (type
), list_p
);
5841 gimplify_one_sizepos (&TYPE_SIZE_UNIT (type
), list_p
);
5843 for (t
= TYPE_NEXT_VARIANT (type
); t
; t
= TYPE_NEXT_VARIANT (t
))
5845 TYPE_SIZE (t
) = TYPE_SIZE (type
);
5846 TYPE_SIZE_UNIT (t
) = TYPE_SIZE_UNIT (type
);
5847 TYPE_SIZES_GIMPLIFIED (t
) = 1;
5851 /* A subroutine of gimplify_type_sizes to make sure that *EXPR_P,
5852 a size or position, has had all of its SAVE_EXPRs evaluated.
5853 We add any required statements to STMT_P. */
5856 gimplify_one_sizepos (tree
*expr_p
, tree
*stmt_p
)
5858 tree type
, expr
= *expr_p
;
5860 /* We don't do anything if the value isn't there, is constant, or contains
5861 A PLACEHOLDER_EXPR. We also don't want to do anything if it's already
5862 a VAR_DECL. If it's a VAR_DECL from another function, the gimplifier
5863 will want to replace it with a new variable, but that will cause problems
5864 if this type is from outside the function. It's OK to have that here. */
5865 if (expr
== NULL_TREE
|| TREE_CONSTANT (expr
)
5866 || TREE_CODE (expr
) == VAR_DECL
5867 || CONTAINS_PLACEHOLDER_P (expr
))
5870 type
= TREE_TYPE (expr
);
5871 *expr_p
= unshare_expr (expr
);
5873 gimplify_expr (expr_p
, stmt_p
, NULL
, is_gimple_val
, fb_rvalue
);
5876 /* Verify that we've an exact type match with the original expression.
5877 In particular, we do not wish to drop a "sizetype" in favour of a
5878 type of similar dimensions. We don't want to pollute the generic
5879 type-stripping code with this knowledge because it doesn't matter
5880 for the bulk of GENERIC/GIMPLE. It only matters that TYPE_SIZE_UNIT
5881 and friends retain their "sizetype-ness". */
5882 if (TREE_TYPE (expr
) != type
5883 && TREE_CODE (type
) == INTEGER_TYPE
5884 && TYPE_IS_SIZETYPE (type
))
5888 *expr_p
= create_tmp_var (type
, NULL
);
5889 tmp
= build1 (NOP_EXPR
, type
, expr
);
5890 tmp
= build2 (MODIFY_EXPR
, type
, *expr_p
, expr
);
5891 if (EXPR_HAS_LOCATION (expr
))
5892 SET_EXPR_LOCUS (tmp
, EXPR_LOCUS (expr
));
5894 SET_EXPR_LOCATION (tmp
, input_location
);
5896 gimplify_and_add (tmp
, stmt_p
);
5900 #ifdef ENABLE_CHECKING
5901 /* Compare types A and B for a "close enough" match. */
5904 cpt_same_type (tree a
, tree b
)
5906 if (lang_hooks
.types_compatible_p (a
, b
))
5909 /* ??? The C++ FE decomposes METHOD_TYPES to FUNCTION_TYPES and doesn't
5910 link them together. This routine is intended to catch type errors
5911 that will affect the optimizers, and the optimizers don't add new
5912 dereferences of function pointers, so ignore it. */
5913 if ((TREE_CODE (a
) == FUNCTION_TYPE
|| TREE_CODE (a
) == METHOD_TYPE
)
5914 && (TREE_CODE (b
) == FUNCTION_TYPE
|| TREE_CODE (b
) == METHOD_TYPE
))
5917 /* ??? The C FE pushes type qualifiers after the fact into the type of
5918 the element from the type of the array. See build_unary_op's handling
5919 of ADDR_EXPR. This seems wrong -- if we were going to do this, we
5920 should have done it when creating the variable in the first place.
5921 Alternately, why aren't the two array types made variants? */
5922 if (TREE_CODE (a
) == ARRAY_TYPE
&& TREE_CODE (b
) == ARRAY_TYPE
)
5923 return cpt_same_type (TREE_TYPE (a
), TREE_TYPE (b
));
5925 /* And because of those, we have to recurse down through pointers. */
5926 if (POINTER_TYPE_P (a
) && POINTER_TYPE_P (b
))
5927 return cpt_same_type (TREE_TYPE (a
), TREE_TYPE (b
));
5932 /* Check for some cases of the front end missing cast expressions.
5933 The type of a dereference should correspond to the pointer type;
5934 similarly the type of an address should match its object. */
5937 check_pointer_types_r (tree
*tp
, int *walk_subtrees ATTRIBUTE_UNUSED
,
5938 void *data ATTRIBUTE_UNUSED
)
5941 tree ptype
, otype
, dtype
;
5943 switch (TREE_CODE (t
))
5947 otype
= TREE_TYPE (t
);
5948 ptype
= TREE_TYPE (TREE_OPERAND (t
, 0));
5949 dtype
= TREE_TYPE (ptype
);
5950 gcc_assert (cpt_same_type (otype
, dtype
));
5954 ptype
= TREE_TYPE (t
);
5955 otype
= TREE_TYPE (TREE_OPERAND (t
, 0));
5956 dtype
= TREE_TYPE (ptype
);
5957 if (!cpt_same_type (otype
, dtype
))
5959 /* &array is allowed to produce a pointer to the element, rather than
5960 a pointer to the array type. We must allow this in order to
5961 properly represent assigning the address of an array in C into
5962 pointer to the element type. */
5963 gcc_assert (TREE_CODE (otype
) == ARRAY_TYPE
5964 && POINTER_TYPE_P (ptype
)
5965 && cpt_same_type (TREE_TYPE (otype
), dtype
));
5979 /* Gimplify the body of statements pointed to by BODY_P. FNDECL is the
5980 function decl containing BODY. */
5983 gimplify_body (tree
*body_p
, tree fndecl
, bool do_parms
)
5985 location_t saved_location
= input_location
;
5986 tree body
, parm_stmts
;
5988 timevar_push (TV_TREE_GIMPLIFY
);
5990 gcc_assert (gimplify_ctxp
== NULL
);
5991 push_gimplify_context ();
5993 /* Unshare most shared trees in the body and in that of any nested functions.
5994 It would seem we don't have to do this for nested functions because
5995 they are supposed to be output and then the outer function gimplified
5996 first, but the g++ front end doesn't always do it that way. */
5997 unshare_body (body_p
, fndecl
);
5998 unvisit_body (body_p
, fndecl
);
6000 /* Make sure input_location isn't set to something wierd. */
6001 input_location
= DECL_SOURCE_LOCATION (fndecl
);
6003 /* Resolve callee-copies. This has to be done before processing
6004 the body so that DECL_VALUE_EXPR gets processed correctly. */
6005 parm_stmts
= do_parms
? gimplify_parameters () : NULL
;
6007 /* Gimplify the function's body. */
6008 gimplify_stmt (body_p
);
6012 body
= alloc_stmt_list ();
6013 else if (TREE_CODE (body
) == STATEMENT_LIST
)
6015 tree t
= expr_only (*body_p
);
6020 /* If there isn't an outer BIND_EXPR, add one. */
6021 if (TREE_CODE (body
) != BIND_EXPR
)
6023 tree b
= build3 (BIND_EXPR
, void_type_node
, NULL_TREE
,
6024 NULL_TREE
, NULL_TREE
);
6025 TREE_SIDE_EFFECTS (b
) = 1;
6026 append_to_statement_list_force (body
, &BIND_EXPR_BODY (b
));
6030 /* If we had callee-copies statements, insert them at the beginning
6034 append_to_statement_list_force (BIND_EXPR_BODY (body
), &parm_stmts
);
6035 BIND_EXPR_BODY (body
) = parm_stmts
;
6038 /* Unshare again, in case gimplification was sloppy. */
6039 unshare_all_trees (body
);
6043 pop_gimplify_context (body
);
6044 gcc_assert (gimplify_ctxp
== NULL
);
6046 #ifdef ENABLE_CHECKING
6047 walk_tree (body_p
, check_pointer_types_r
, NULL
, NULL
);
6050 timevar_pop (TV_TREE_GIMPLIFY
);
6051 input_location
= saved_location
;
6054 /* Entry point to the gimplification pass. FNDECL is the FUNCTION_DECL
6055 node for the function we want to gimplify. */
6058 gimplify_function_tree (tree fndecl
)
6060 tree oldfn
, parm
, ret
;
6062 oldfn
= current_function_decl
;
6063 current_function_decl
= fndecl
;
6064 cfun
= DECL_STRUCT_FUNCTION (fndecl
);
6066 allocate_struct_function (fndecl
);
6068 for (parm
= DECL_ARGUMENTS (fndecl
); parm
; parm
= TREE_CHAIN (parm
))
6070 /* Preliminarily mark non-addressed complex variables as eligible
6071 for promotion to gimple registers. We'll transform their uses
6073 if (TREE_CODE (TREE_TYPE (parm
)) == COMPLEX_TYPE
6074 && !TREE_THIS_VOLATILE (parm
)
6075 && !needs_to_live_in_memory (parm
))
6076 DECL_COMPLEX_GIMPLE_REG_P (parm
) = 1;
6079 ret
= DECL_RESULT (fndecl
);
6080 if (TREE_CODE (TREE_TYPE (ret
)) == COMPLEX_TYPE
6081 && !needs_to_live_in_memory (ret
))
6082 DECL_COMPLEX_GIMPLE_REG_P (ret
) = 1;
6084 gimplify_body (&DECL_SAVED_TREE (fndecl
), fndecl
, true);
6086 /* If we're instrumenting function entry/exit, then prepend the call to
6087 the entry hook and wrap the whole function in a TRY_FINALLY_EXPR to
6088 catch the exit hook. */
6089 /* ??? Add some way to ignore exceptions for this TFE. */
6090 if (flag_instrument_function_entry_exit
6091 && ! DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (fndecl
))
6095 tf
= build2 (TRY_FINALLY_EXPR
, void_type_node
, NULL
, NULL
);
6096 TREE_SIDE_EFFECTS (tf
) = 1;
6097 x
= DECL_SAVED_TREE (fndecl
);
6098 append_to_statement_list (x
, &TREE_OPERAND (tf
, 0));
6099 x
= implicit_built_in_decls
[BUILT_IN_PROFILE_FUNC_EXIT
];
6100 x
= build_function_call_expr (x
, NULL
);
6101 append_to_statement_list (x
, &TREE_OPERAND (tf
, 1));
6103 bind
= build3 (BIND_EXPR
, void_type_node
, NULL
, NULL
, NULL
);
6104 TREE_SIDE_EFFECTS (bind
) = 1;
6105 x
= implicit_built_in_decls
[BUILT_IN_PROFILE_FUNC_ENTER
];
6106 x
= build_function_call_expr (x
, NULL
);
6107 append_to_statement_list (x
, &BIND_EXPR_BODY (bind
));
6108 append_to_statement_list (tf
, &BIND_EXPR_BODY (bind
));
6110 DECL_SAVED_TREE (fndecl
) = bind
;
6113 current_function_decl
= oldfn
;
6114 cfun
= oldfn
? DECL_STRUCT_FUNCTION (oldfn
) : NULL
;
6118 /* Expands EXPR to list of gimple statements STMTS. If SIMPLE is true,
6119 force the result to be either ssa_name or an invariant, otherwise
6120 just force it to be a rhs expression. If VAR is not NULL, make the
6121 base variable of the final destination be VAR if suitable. */
6124 force_gimple_operand (tree expr
, tree
*stmts
, bool simple
, tree var
)
6127 enum gimplify_status ret
;
6128 gimple_predicate gimple_test_f
;
6132 if (is_gimple_val (expr
))
6135 gimple_test_f
= simple
? is_gimple_val
: is_gimple_reg_rhs
;
6137 push_gimplify_context ();
6138 gimplify_ctxp
->into_ssa
= in_ssa_p
;
6141 expr
= build2 (MODIFY_EXPR
, TREE_TYPE (var
), var
, expr
);
6143 ret
= gimplify_expr (&expr
, stmts
, NULL
,
6144 gimple_test_f
, fb_rvalue
);
6145 gcc_assert (ret
!= GS_ERROR
);
6147 if (referenced_vars
)
6149 for (t
= gimplify_ctxp
->temps
; t
; t
= TREE_CHAIN (t
))
6150 add_referenced_tmp_var (t
);
6153 pop_gimplify_context (NULL
);
6158 /* Invokes force_gimple_operand for EXPR with parameters SIMPLE_P and VAR. If
6159 some statements are produced, emits them before BSI. */
6162 force_gimple_operand_bsi (block_stmt_iterator
*bsi
, tree expr
,
6163 bool simple_p
, tree var
)
6167 expr
= force_gimple_operand (expr
, &stmts
, simple_p
, var
);
6169 bsi_insert_before (bsi
, stmts
, BSI_SAME_STMT
);
6174 #include "gt-gimplify.h"