2 Copyright 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
3 Free Software Foundation, Inc.
4 Contributed by Alexandre Oliva <aoliva@redhat.com>
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3, or (at your option)
13 GCC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
24 #include "coretypes.h"
28 #include "tree-inline.h"
34 #include "insn-config.h"
37 #include "langhooks.h"
38 #include "basic-block.h"
39 #include "tree-iterator.h"
42 #include "tree-mudflap.h"
43 #include "tree-flow.h"
46 #include "tree-flow.h"
47 #include "diagnostic.h"
50 #include "pointer-set.h"
52 #include "value-prof.h"
53 #include "tree-pass.h"
55 #include "integrate.h"
57 /* I'm not real happy about this, but we need to handle gimple and
61 /* Inlining, Cloning, Versioning, Parallelization
63 Inlining: a function body is duplicated, but the PARM_DECLs are
64 remapped into VAR_DECLs, and non-void RETURN_EXPRs become
65 MODIFY_EXPRs that store to a dedicated returned-value variable.
66 The duplicated eh_region info of the copy will later be appended
67 to the info for the caller; the eh_region info in copied throwing
68 statements and RESX_EXPRs is adjusted accordingly.
70 Cloning: (only in C++) We have one body for a con/de/structor, and
71 multiple function decls, each with a unique parameter list.
72 Duplicate the body, using the given splay tree; some parameters
73 will become constants (like 0 or 1).
75 Versioning: a function body is duplicated and the result is a new
76 function rather than into blocks of an existing function as with
77 inlining. Some parameters will become constants.
79 Parallelization: a region of a function is duplicated resulting in
80 a new function. Variables may be replaced with complex expressions
81 to enable shared variable semantics.
83 All of these will simultaneously lookup any callgraph edges. If
84 we're going to inline the duplicated function body, and the given
85 function has some cloned callgraph nodes (one for each place this
86 function will be inlined) those callgraph edges will be duplicated.
87 If we're cloning the body, those callgraph edges will be
88 updated to point into the new body. (Note that the original
89 callgraph node and edge list will not be altered.)
91 See the CALL_EXPR handling case in copy_tree_body_r (). */
95 o In order to make inlining-on-trees work, we pessimized
96 function-local static constants. In particular, they are now
97 always output, even when not addressed. Fix this by treating
98 function-local static constants just like global static
99 constants; the back-end already knows not to output them if they
102 o Provide heuristics to clamp inlining of recursive template
106 /* Weights that estimate_num_insns uses for heuristics in inlining. */
108 eni_weights eni_inlining_weights;
110 /* Weights that estimate_num_insns uses to estimate the size of the
113 eni_weights eni_size_weights;
115 /* Weights that estimate_num_insns uses to estimate the time necessary
116 to execute the produced code. */
118 eni_weights eni_time_weights;
122 static tree declare_return_variable (copy_body_data *, tree, tree, tree *);
123 static bool inlinable_function_p (tree);
124 static void remap_block (tree *, copy_body_data *);
125 static tree remap_decls (tree, copy_body_data *);
126 static void copy_bind_expr (tree *, int *, copy_body_data *);
127 static tree mark_local_for_remap_r (tree *, int *, void *);
128 static void unsave_expr_1 (tree);
129 static tree unsave_r (tree *, int *, void *);
130 static void declare_inline_vars (tree, tree);
131 static void remap_save_expr (tree *, void *, int *);
132 static void prepend_lexical_block (tree current_block, tree new_block);
133 static tree copy_decl_to_var (tree, copy_body_data *);
134 static tree copy_result_decl_to_var (tree, copy_body_data *);
135 static tree copy_decl_maybe_to_var (tree, copy_body_data *);
136 static gimple remap_gimple_stmt (gimple, copy_body_data *);
138 /* Insert a tree->tree mapping for ID. Despite the name suggests
139 that the trees should be variables, it is used for more than that. */
142 insert_decl_map (copy_body_data *id, tree key, tree value)
144 *pointer_map_insert (id->decl_map, key) = value;
146 /* Always insert an identity map as well. If we see this same new
147 node again, we won't want to duplicate it a second time. */
149 *pointer_map_insert (id->decl_map, value) = value;
152 /* Construct new SSA name for old NAME. ID is the inline context. */
155 remap_ssa_name (tree name, copy_body_data *id)
160 gcc_assert (TREE_CODE (name) == SSA_NAME);
162 n = (tree *) pointer_map_contains (id->decl_map, name);
164 return unshare_expr (*n);
166 /* Do not set DEF_STMT yet as statement is not copied yet. We do that
168 new_tree = remap_decl (SSA_NAME_VAR (name), id);
170 /* We might've substituted constant or another SSA_NAME for
173 Replace the SSA name representing RESULT_DECL by variable during
174 inlining: this saves us from need to introduce PHI node in a case
175 return value is just partly initialized. */
176 if ((TREE_CODE (new_tree) == VAR_DECL || TREE_CODE (new_tree) == PARM_DECL)
177 && (TREE_CODE (SSA_NAME_VAR (name)) != RESULT_DECL
178 || !id->transform_return_to_modify))
180 new_tree = make_ssa_name (new_tree, NULL);
181 insert_decl_map (id, name, new_tree);
182 SSA_NAME_OCCURS_IN_ABNORMAL_PHI (new_tree)
183 = SSA_NAME_OCCURS_IN_ABNORMAL_PHI (name);
184 TREE_TYPE (new_tree) = TREE_TYPE (SSA_NAME_VAR (new_tree));
185 if (gimple_nop_p (SSA_NAME_DEF_STMT (name)))
187 /* By inlining function having uninitialized variable, we might
188 extend the lifetime (variable might get reused). This cause
189 ICE in the case we end up extending lifetime of SSA name across
190 abnormal edge, but also increase register pressure.
192 We simply initialize all uninitialized vars by 0 except
193 for case we are inlining to very first BB. We can avoid
194 this for all BBs that are not inside strongly connected
195 regions of the CFG, but this is expensive to test. */
197 && is_gimple_reg (SSA_NAME_VAR (name))
198 && TREE_CODE (SSA_NAME_VAR (name)) != PARM_DECL
199 && (id->entry_bb != EDGE_SUCC (ENTRY_BLOCK_PTR, 0)->dest
200 || EDGE_COUNT (id->entry_bb->preds) != 1))
202 gimple_stmt_iterator gsi = gsi_last_bb (id->entry_bb);
205 init_stmt = gimple_build_assign (new_tree,
206 fold_convert (TREE_TYPE (new_tree),
208 gsi_insert_after (&gsi, init_stmt, GSI_NEW_STMT);
209 SSA_NAME_IS_DEFAULT_DEF (new_tree) = 0;
213 SSA_NAME_DEF_STMT (new_tree) = gimple_build_nop ();
214 if (gimple_default_def (id->src_cfun, SSA_NAME_VAR (name))
216 set_default_def (SSA_NAME_VAR (new_tree), new_tree);
221 insert_decl_map (id, name, new_tree);
225 /* Remap DECL during the copying of the BLOCK tree for the function. */
228 remap_decl (tree decl, copy_body_data *id)
233 /* We only remap local variables in the current function. */
236 /* See if we have remapped this declaration. */
238 n = (tree *) pointer_map_contains (id->decl_map, decl);
240 /* If we didn't already have an equivalent for this declaration,
244 /* Make a copy of the variable or label. */
245 tree t = id->copy_decl (decl, id);
247 /* Remember it, so that if we encounter this local entity again
248 we can reuse this copy. Do this early because remap_type may
249 need this decl for TYPE_STUB_DECL. */
250 insert_decl_map (id, decl, t);
255 /* Remap types, if necessary. */
256 TREE_TYPE (t) = remap_type (TREE_TYPE (t), id);
257 if (TREE_CODE (t) == TYPE_DECL)
258 DECL_ORIGINAL_TYPE (t) = remap_type (DECL_ORIGINAL_TYPE (t), id);
260 /* Remap sizes as necessary. */
261 walk_tree (&DECL_SIZE (t), copy_tree_body_r, id, NULL);
262 walk_tree (&DECL_SIZE_UNIT (t), copy_tree_body_r, id, NULL);
264 /* If fields, do likewise for offset and qualifier. */
265 if (TREE_CODE (t) == FIELD_DECL)
267 walk_tree (&DECL_FIELD_OFFSET (t), copy_tree_body_r, id, NULL);
268 if (TREE_CODE (DECL_CONTEXT (t)) == QUAL_UNION_TYPE)
269 walk_tree (&DECL_QUALIFIER (t), copy_tree_body_r, id, NULL);
272 if (cfun && gimple_in_ssa_p (cfun)
273 && (TREE_CODE (t) == VAR_DECL
274 || TREE_CODE (t) == RESULT_DECL || TREE_CODE (t) == PARM_DECL))
276 tree def = gimple_default_def (id->src_cfun, decl);
278 if (TREE_CODE (decl) != PARM_DECL && def)
280 tree map = remap_ssa_name (def, id);
281 /* Watch out RESULT_DECLs whose SSA names map directly
283 if (TREE_CODE (map) == SSA_NAME
284 && gimple_nop_p (SSA_NAME_DEF_STMT (map)))
285 set_default_def (t, map);
287 add_referenced_var (t);
292 return unshare_expr (*n);
296 remap_type_1 (tree type, copy_body_data *id)
300 /* We do need a copy. build and register it now. If this is a pointer or
301 reference type, remap the designated type and make a new pointer or
303 if (TREE_CODE (type) == POINTER_TYPE)
305 new_tree = build_pointer_type_for_mode (remap_type (TREE_TYPE (type), id),
307 TYPE_REF_CAN_ALIAS_ALL (type));
308 insert_decl_map (id, type, new_tree);
311 else if (TREE_CODE (type) == REFERENCE_TYPE)
313 new_tree = build_reference_type_for_mode (remap_type (TREE_TYPE (type), id),
315 TYPE_REF_CAN_ALIAS_ALL (type));
316 insert_decl_map (id, type, new_tree);
320 new_tree = copy_node (type);
322 insert_decl_map (id, type, new_tree);
324 /* This is a new type, not a copy of an old type. Need to reassociate
325 variants. We can handle everything except the main variant lazily. */
326 t = TYPE_MAIN_VARIANT (type);
329 t = remap_type (t, id);
330 TYPE_MAIN_VARIANT (new_tree) = t;
331 TYPE_NEXT_VARIANT (new_tree) = TYPE_NEXT_VARIANT (t);
332 TYPE_NEXT_VARIANT (t) = new_tree;
336 TYPE_MAIN_VARIANT (new_tree) = new_tree;
337 TYPE_NEXT_VARIANT (new_tree) = NULL;
340 if (TYPE_STUB_DECL (type))
341 TYPE_STUB_DECL (new_tree) = remap_decl (TYPE_STUB_DECL (type), id);
343 /* Lazily create pointer and reference types. */
344 TYPE_POINTER_TO (new_tree) = NULL;
345 TYPE_REFERENCE_TO (new_tree) = NULL;
347 switch (TREE_CODE (new_tree))
351 case FIXED_POINT_TYPE:
354 t = TYPE_MIN_VALUE (new_tree);
355 if (t && TREE_CODE (t) != INTEGER_CST)
356 walk_tree (&TYPE_MIN_VALUE (new_tree), copy_tree_body_r, id, NULL);
358 t = TYPE_MAX_VALUE (new_tree);
359 if (t && TREE_CODE (t) != INTEGER_CST)
360 walk_tree (&TYPE_MAX_VALUE (new_tree), copy_tree_body_r, id, NULL);
364 TREE_TYPE (new_tree) = remap_type (TREE_TYPE (new_tree), id);
365 walk_tree (&TYPE_ARG_TYPES (new_tree), copy_tree_body_r, id, NULL);
369 TREE_TYPE (new_tree) = remap_type (TREE_TYPE (new_tree), id);
370 TYPE_DOMAIN (new_tree) = remap_type (TYPE_DOMAIN (new_tree), id);
375 case QUAL_UNION_TYPE:
379 for (f = TYPE_FIELDS (new_tree); f ; f = TREE_CHAIN (f))
381 t = remap_decl (f, id);
382 DECL_CONTEXT (t) = new_tree;
386 TYPE_FIELDS (new_tree) = nreverse (nf);
392 /* Shouldn't have been thought variable sized. */
396 walk_tree (&TYPE_SIZE (new_tree), copy_tree_body_r, id, NULL);
397 walk_tree (&TYPE_SIZE_UNIT (new_tree), copy_tree_body_r, id, NULL);
403 remap_type (tree type, copy_body_data *id)
411 /* See if we have remapped this type. */
412 node = (tree *) pointer_map_contains (id->decl_map, type);
416 /* The type only needs remapping if it's variably modified. */
417 if (! variably_modified_type_p (type, id->src_fn))
419 insert_decl_map (id, type, type);
423 id->remapping_type_depth++;
424 tmp = remap_type_1 (type, id);
425 id->remapping_type_depth--;
431 remap_decls (tree decls, copy_body_data *id)
434 tree new_decls = NULL_TREE;
436 /* Remap its variables. */
437 for (old_var = decls; old_var; old_var = TREE_CHAIN (old_var))
441 /* We cannot chain the local static declarations into the local_decls
442 as we can't duplicate them or break one decl rule. Go ahead
443 and link them into local_decls. */
445 if (!auto_var_in_fn_p (old_var, id->src_fn)
446 && !DECL_EXTERNAL (old_var))
448 cfun->local_decls = tree_cons (NULL_TREE, old_var,
453 /* Remap the variable. */
454 new_var = remap_decl (old_var, id);
456 /* If we didn't remap this variable, we can't mess with its
457 TREE_CHAIN. If we remapped this variable to the return slot, it's
458 already declared somewhere else, so don't declare it here. */
459 if (!new_var || new_var == id->retvar)
463 gcc_assert (DECL_P (new_var));
464 TREE_CHAIN (new_var) = new_decls;
469 return nreverse (new_decls);
472 /* Copy the BLOCK to contain remapped versions of the variables
473 therein. And hook the new block into the block-tree. */
476 remap_block (tree *block, copy_body_data *id)
482 /* Make the new block. */
484 new_block = make_node (BLOCK);
485 TREE_USED (new_block) = TREE_USED (old_block);
486 BLOCK_ABSTRACT_ORIGIN (new_block) = old_block;
487 BLOCK_SOURCE_LOCATION (new_block) = BLOCK_SOURCE_LOCATION (old_block);
490 /* Remap its variables. */
491 BLOCK_VARS (new_block) = remap_decls (BLOCK_VARS (old_block), id);
495 if (id->transform_lang_insert_block)
496 id->transform_lang_insert_block (new_block);
498 /* Remember the remapped block. */
499 insert_decl_map (id, old_block, new_block);
502 /* Copy the whole block tree and root it in id->block. */
504 remap_blocks (tree block, copy_body_data *id)
507 tree new_tree = block;
512 remap_block (&new_tree, id);
513 gcc_assert (new_tree != block);
514 for (t = BLOCK_SUBBLOCKS (block); t ; t = BLOCK_CHAIN (t))
515 prepend_lexical_block (new_tree, remap_blocks (t, id));
516 /* Blocks are in arbitrary order, but make things slightly prettier and do
517 not swap order when producing a copy. */
518 BLOCK_SUBBLOCKS (new_tree) = blocks_nreverse (BLOCK_SUBBLOCKS (new_tree));
523 copy_statement_list (tree *tp)
525 tree_stmt_iterator oi, ni;
528 new_tree = alloc_stmt_list ();
529 ni = tsi_start (new_tree);
530 oi = tsi_start (*tp);
533 for (; !tsi_end_p (oi); tsi_next (&oi))
534 tsi_link_after (&ni, tsi_stmt (oi), TSI_NEW_STMT);
538 copy_bind_expr (tree *tp, int *walk_subtrees, copy_body_data *id)
540 tree block = BIND_EXPR_BLOCK (*tp);
541 /* Copy (and replace) the statement. */
542 copy_tree_r (tp, walk_subtrees, NULL);
545 remap_block (&block, id);
546 BIND_EXPR_BLOCK (*tp) = block;
549 if (BIND_EXPR_VARS (*tp))
550 /* This will remap a lot of the same decls again, but this should be
552 BIND_EXPR_VARS (*tp) = remap_decls (BIND_EXPR_VARS (*tp), id);
556 /* Create a new gimple_seq by remapping all the statements in BODY
557 using the inlining information in ID. */
560 remap_gimple_seq (gimple_seq body, copy_body_data *id)
562 gimple_stmt_iterator si;
563 gimple_seq new_body = NULL;
565 for (si = gsi_start (body); !gsi_end_p (si); gsi_next (&si))
567 gimple new_stmt = remap_gimple_stmt (gsi_stmt (si), id);
568 gimple_seq_add_stmt (&new_body, new_stmt);
575 /* Copy a GIMPLE_BIND statement STMT, remapping all the symbols in its
576 block using the mapping information in ID. */
579 copy_gimple_bind (gimple stmt, copy_body_data *id)
582 tree new_block, new_vars;
583 gimple_seq body, new_body;
585 /* Copy the statement. Note that we purposely don't use copy_stmt
586 here because we need to remap statements as we copy. */
587 body = gimple_bind_body (stmt);
588 new_body = remap_gimple_seq (body, id);
590 new_block = gimple_bind_block (stmt);
592 remap_block (&new_block, id);
594 /* This will remap a lot of the same decls again, but this should be
596 new_vars = gimple_bind_vars (stmt);
598 new_vars = remap_decls (new_vars, id);
600 new_bind = gimple_build_bind (new_vars, new_body, new_block);
606 /* Remap the GIMPLE operand pointed to by *TP. DATA is really a
607 'struct walk_stmt_info *'. DATA->INFO is a 'copy_body_data *'.
608 WALK_SUBTREES is used to indicate walk_gimple_op whether to keep
609 recursing into the children nodes of *TP. */
612 remap_gimple_op_r (tree *tp, int *walk_subtrees, void *data)
614 struct walk_stmt_info *wi_p = (struct walk_stmt_info *) data;
615 copy_body_data *id = (copy_body_data *) wi_p->info;
616 tree fn = id->src_fn;
618 if (TREE_CODE (*tp) == SSA_NAME)
620 *tp = remap_ssa_name (*tp, id);
624 else if (auto_var_in_fn_p (*tp, fn))
626 /* Local variables and labels need to be replaced by equivalent
627 variables. We don't want to copy static variables; there's
628 only one of those, no matter how many times we inline the
629 containing function. Similarly for globals from an outer
633 /* Remap the declaration. */
634 new_decl = remap_decl (*tp, id);
635 gcc_assert (new_decl);
636 /* Replace this variable with the copy. */
637 STRIP_TYPE_NOPS (new_decl);
641 else if (TREE_CODE (*tp) == STATEMENT_LIST)
643 else if (TREE_CODE (*tp) == SAVE_EXPR)
645 else if (TREE_CODE (*tp) == LABEL_DECL
646 && (!DECL_CONTEXT (*tp)
647 || decl_function_context (*tp) == id->src_fn))
648 /* These may need to be remapped for EH handling. */
649 *tp = remap_decl (*tp, id);
650 else if (TYPE_P (*tp))
651 /* Types may need remapping as well. */
652 *tp = remap_type (*tp, id);
653 else if (CONSTANT_CLASS_P (*tp))
655 /* If this is a constant, we have to copy the node iff the type
656 will be remapped. copy_tree_r will not copy a constant. */
657 tree new_type = remap_type (TREE_TYPE (*tp), id);
659 if (new_type == TREE_TYPE (*tp))
662 else if (TREE_CODE (*tp) == INTEGER_CST)
663 *tp = build_int_cst_wide (new_type, TREE_INT_CST_LOW (*tp),
664 TREE_INT_CST_HIGH (*tp));
667 *tp = copy_node (*tp);
668 TREE_TYPE (*tp) = new_type;
673 /* Otherwise, just copy the node. Note that copy_tree_r already
674 knows not to copy VAR_DECLs, etc., so this is safe. */
675 if (TREE_CODE (*tp) == INDIRECT_REF)
677 /* Get rid of *& from inline substitutions that can happen when a
678 pointer argument is an ADDR_EXPR. */
679 tree decl = TREE_OPERAND (*tp, 0);
682 n = (tree *) pointer_map_contains (id->decl_map, decl);
685 tree type, new_tree, old;
687 /* If we happen to get an ADDR_EXPR in n->value, strip
688 it manually here as we'll eventually get ADDR_EXPRs
689 which lie about their types pointed to. In this case
690 build_fold_indirect_ref wouldn't strip the
691 INDIRECT_REF, but we absolutely rely on that. As
692 fold_indirect_ref does other useful transformations,
693 try that first, though. */
694 type = TREE_TYPE (TREE_TYPE (*n));
695 new_tree = unshare_expr (*n);
697 *tp = gimple_fold_indirect_ref (new_tree);
700 if (TREE_CODE (new_tree) == ADDR_EXPR)
702 *tp = fold_indirect_ref_1 (type, new_tree);
703 /* ??? We should either assert here or build
704 a VIEW_CONVERT_EXPR instead of blindly leaking
705 incompatible types to our IL. */
707 *tp = TREE_OPERAND (new_tree, 0);
711 *tp = build1 (INDIRECT_REF, type, new_tree);
712 TREE_THIS_VOLATILE (*tp) = TREE_THIS_VOLATILE (old);
720 /* Here is the "usual case". Copy this tree node, and then
721 tweak some special cases. */
722 copy_tree_r (tp, walk_subtrees, NULL);
724 /* Global variables we haven't seen yet need to go into referenced
725 vars. If not referenced from types only. */
726 if (gimple_in_ssa_p (cfun)
727 && TREE_CODE (*tp) == VAR_DECL
728 && id->remapping_type_depth == 0)
729 add_referenced_var (*tp);
731 /* We should never have TREE_BLOCK set on non-statements. */
733 gcc_assert (!TREE_BLOCK (*tp));
735 if (TREE_CODE (*tp) != OMP_CLAUSE)
736 TREE_TYPE (*tp) = remap_type (TREE_TYPE (*tp), id);
738 if (TREE_CODE (*tp) == TARGET_EXPR && TREE_OPERAND (*tp, 3))
740 /* The copied TARGET_EXPR has never been expanded, even if the
741 original node was expanded already. */
742 TREE_OPERAND (*tp, 1) = TREE_OPERAND (*tp, 3);
743 TREE_OPERAND (*tp, 3) = NULL_TREE;
745 else if (TREE_CODE (*tp) == ADDR_EXPR)
747 /* Variable substitution need not be simple. In particular,
748 the INDIRECT_REF substitution above. Make sure that
749 TREE_CONSTANT and friends are up-to-date. But make sure
750 to not improperly set TREE_BLOCK on some sub-expressions. */
751 int invariant = is_gimple_min_invariant (*tp);
752 tree block = id->block;
753 id->block = NULL_TREE;
754 walk_tree (&TREE_OPERAND (*tp, 0), copy_tree_body_r, id, NULL);
757 /* Handle the case where we substituted an INDIRECT_REF
758 into the operand of the ADDR_EXPR. */
759 if (TREE_CODE (TREE_OPERAND (*tp, 0)) == INDIRECT_REF)
760 *tp = TREE_OPERAND (TREE_OPERAND (*tp, 0), 0);
762 recompute_tree_invariant_for_addr_expr (*tp);
764 /* If this used to be invariant, but is not any longer,
765 then regimplification is probably needed. */
766 if (invariant && !is_gimple_min_invariant (*tp))
767 id->regimplify = true;
773 /* Keep iterating. */
778 /* Called from copy_body_id via walk_tree. DATA is really a
779 `copy_body_data *'. */
782 copy_tree_body_r (tree *tp, int *walk_subtrees, void *data)
784 copy_body_data *id = (copy_body_data *) data;
785 tree fn = id->src_fn;
788 /* Begin by recognizing trees that we'll completely rewrite for the
789 inlining context. Our output for these trees is completely
790 different from out input (e.g. RETURN_EXPR is deleted, and morphs
791 into an edge). Further down, we'll handle trees that get
792 duplicated and/or tweaked. */
794 /* When requested, RETURN_EXPRs should be transformed to just the
795 contained MODIFY_EXPR. The branch semantics of the return will
796 be handled elsewhere by manipulating the CFG rather than a statement. */
797 if (TREE_CODE (*tp) == RETURN_EXPR && id->transform_return_to_modify)
799 tree assignment = TREE_OPERAND (*tp, 0);
801 /* If we're returning something, just turn that into an
802 assignment into the equivalent of the original RESULT_DECL.
803 If the "assignment" is just the result decl, the result
804 decl has already been set (e.g. a recent "foo (&result_decl,
805 ...)"); just toss the entire RETURN_EXPR. */
806 if (assignment && TREE_CODE (assignment) == MODIFY_EXPR)
808 /* Replace the RETURN_EXPR with (a copy of) the
809 MODIFY_EXPR hanging underneath. */
810 *tp = copy_node (assignment);
812 else /* Else the RETURN_EXPR returns no value. */
815 return (tree) (void *)1;
818 else if (TREE_CODE (*tp) == SSA_NAME)
820 *tp = remap_ssa_name (*tp, id);
825 /* Local variables and labels need to be replaced by equivalent
826 variables. We don't want to copy static variables; there's only
827 one of those, no matter how many times we inline the containing
828 function. Similarly for globals from an outer function. */
829 else if (auto_var_in_fn_p (*tp, fn))
833 /* Remap the declaration. */
834 new_decl = remap_decl (*tp, id);
835 gcc_assert (new_decl);
836 /* Replace this variable with the copy. */
837 STRIP_TYPE_NOPS (new_decl);
841 else if (TREE_CODE (*tp) == STATEMENT_LIST)
842 copy_statement_list (tp);
843 else if (TREE_CODE (*tp) == SAVE_EXPR)
844 remap_save_expr (tp, id->decl_map, walk_subtrees);
845 else if (TREE_CODE (*tp) == LABEL_DECL
846 && (! DECL_CONTEXT (*tp)
847 || decl_function_context (*tp) == id->src_fn))
848 /* These may need to be remapped for EH handling. */
849 *tp = remap_decl (*tp, id);
850 else if (TREE_CODE (*tp) == BIND_EXPR)
851 copy_bind_expr (tp, walk_subtrees, id);
852 /* Types may need remapping as well. */
853 else if (TYPE_P (*tp))
854 *tp = remap_type (*tp, id);
856 /* If this is a constant, we have to copy the node iff the type will be
857 remapped. copy_tree_r will not copy a constant. */
858 else if (CONSTANT_CLASS_P (*tp))
860 tree new_type = remap_type (TREE_TYPE (*tp), id);
862 if (new_type == TREE_TYPE (*tp))
865 else if (TREE_CODE (*tp) == INTEGER_CST)
866 *tp = build_int_cst_wide (new_type, TREE_INT_CST_LOW (*tp),
867 TREE_INT_CST_HIGH (*tp));
870 *tp = copy_node (*tp);
871 TREE_TYPE (*tp) = new_type;
875 /* Otherwise, just copy the node. Note that copy_tree_r already
876 knows not to copy VAR_DECLs, etc., so this is safe. */
879 /* Here we handle trees that are not completely rewritten.
880 First we detect some inlining-induced bogosities for
882 if (TREE_CODE (*tp) == MODIFY_EXPR
883 && TREE_OPERAND (*tp, 0) == TREE_OPERAND (*tp, 1)
884 && (auto_var_in_fn_p (TREE_OPERAND (*tp, 0), fn)))
886 /* Some assignments VAR = VAR; don't generate any rtl code
887 and thus don't count as variable modification. Avoid
888 keeping bogosities like 0 = 0. */
889 tree decl = TREE_OPERAND (*tp, 0), value;
892 n = (tree *) pointer_map_contains (id->decl_map, decl);
896 STRIP_TYPE_NOPS (value);
897 if (TREE_CONSTANT (value) || TREE_READONLY (value))
899 *tp = build_empty_stmt ();
900 return copy_tree_body_r (tp, walk_subtrees, data);
904 else if (TREE_CODE (*tp) == INDIRECT_REF)
906 /* Get rid of *& from inline substitutions that can happen when a
907 pointer argument is an ADDR_EXPR. */
908 tree decl = TREE_OPERAND (*tp, 0);
911 n = (tree *) pointer_map_contains (id->decl_map, decl);
916 /* If we happen to get an ADDR_EXPR in n->value, strip
917 it manually here as we'll eventually get ADDR_EXPRs
918 which lie about their types pointed to. In this case
919 build_fold_indirect_ref wouldn't strip the INDIRECT_REF,
920 but we absolutely rely on that. As fold_indirect_ref
921 does other useful transformations, try that first, though. */
922 tree type = TREE_TYPE (TREE_TYPE (*n));
923 new_tree = unshare_expr (*n);
925 *tp = gimple_fold_indirect_ref (new_tree);
928 if (TREE_CODE (new_tree) == ADDR_EXPR)
930 *tp = fold_indirect_ref_1 (type, new_tree);
931 /* ??? We should either assert here or build
932 a VIEW_CONVERT_EXPR instead of blindly leaking
933 incompatible types to our IL. */
935 *tp = TREE_OPERAND (new_tree, 0);
939 *tp = build1 (INDIRECT_REF, type, new_tree);
940 TREE_THIS_VOLATILE (*tp) = TREE_THIS_VOLATILE (old);
941 TREE_SIDE_EFFECTS (*tp) = TREE_SIDE_EFFECTS (old);
949 /* Here is the "usual case". Copy this tree node, and then
950 tweak some special cases. */
951 copy_tree_r (tp, walk_subtrees, NULL);
953 /* Global variables we haven't seen yet needs to go into referenced
954 vars. If not referenced from types only. */
955 if (gimple_in_ssa_p (cfun)
956 && TREE_CODE (*tp) == VAR_DECL
957 && id->remapping_type_depth == 0)
958 add_referenced_var (*tp);
960 /* If EXPR has block defined, map it to newly constructed block.
961 When inlining we want EXPRs without block appear in the block
965 new_block = id->block;
966 if (TREE_BLOCK (*tp))
969 n = (tree *) pointer_map_contains (id->decl_map,
974 TREE_BLOCK (*tp) = new_block;
977 if (TREE_CODE (*tp) == RESX_EXPR && id->eh_region_offset)
978 TREE_OPERAND (*tp, 0) =
979 build_int_cst (NULL_TREE,
981 + TREE_INT_CST_LOW (TREE_OPERAND (*tp, 0)));
983 if (TREE_CODE (*tp) != OMP_CLAUSE)
984 TREE_TYPE (*tp) = remap_type (TREE_TYPE (*tp), id);
986 /* The copied TARGET_EXPR has never been expanded, even if the
987 original node was expanded already. */
988 if (TREE_CODE (*tp) == TARGET_EXPR && TREE_OPERAND (*tp, 3))
990 TREE_OPERAND (*tp, 1) = TREE_OPERAND (*tp, 3);
991 TREE_OPERAND (*tp, 3) = NULL_TREE;
994 /* Variable substitution need not be simple. In particular, the
995 INDIRECT_REF substitution above. Make sure that TREE_CONSTANT
996 and friends are up-to-date. */
997 else if (TREE_CODE (*tp) == ADDR_EXPR)
999 int invariant = is_gimple_min_invariant (*tp);
1000 walk_tree (&TREE_OPERAND (*tp, 0), copy_tree_body_r, id, NULL);
1002 /* Handle the case where we substituted an INDIRECT_REF
1003 into the operand of the ADDR_EXPR. */
1004 if (TREE_CODE (TREE_OPERAND (*tp, 0)) == INDIRECT_REF)
1005 *tp = TREE_OPERAND (TREE_OPERAND (*tp, 0), 0);
1007 recompute_tree_invariant_for_addr_expr (*tp);
1009 /* If this used to be invariant, but is not any longer,
1010 then regimplification is probably needed. */
1011 if (invariant && !is_gimple_min_invariant (*tp))
1012 id->regimplify = true;
1018 /* Keep iterating. */
1023 /* Helper for copy_bb. Remap statement STMT using the inlining
1024 information in ID. Return the new statement copy. */
1027 remap_gimple_stmt (gimple stmt, copy_body_data *id)
1030 struct walk_stmt_info wi;
1032 bool skip_first = false;
1034 /* Begin by recognizing trees that we'll completely rewrite for the
1035 inlining context. Our output for these trees is completely
1036 different from out input (e.g. RETURN_EXPR is deleted, and morphs
1037 into an edge). Further down, we'll handle trees that get
1038 duplicated and/or tweaked. */
1040 /* When requested, GIMPLE_RETURNs should be transformed to just the
1041 contained GIMPLE_ASSIGN. The branch semantics of the return will
1042 be handled elsewhere by manipulating the CFG rather than the
1044 if (gimple_code (stmt) == GIMPLE_RETURN && id->transform_return_to_modify)
1046 tree retval = gimple_return_retval (stmt);
1048 /* If we're returning something, just turn that into an
1049 assignment into the equivalent of the original RESULT_DECL.
1050 If RETVAL is just the result decl, the result decl has
1051 already been set (e.g. a recent "foo (&result_decl, ...)");
1052 just toss the entire GIMPLE_RETURN. */
1053 if (retval && TREE_CODE (retval) != RESULT_DECL)
1055 copy = gimple_build_assign (id->retvar, retval);
1056 /* id->retvar is already substituted. Skip it on later remapping. */
1060 return gimple_build_nop ();
1062 else if (gimple_has_substatements (stmt))
1066 /* When cloning bodies from the C++ front end, we will be handed bodies
1067 in High GIMPLE form. Handle here all the High GIMPLE statements that
1068 have embedded statements. */
1069 switch (gimple_code (stmt))
1072 copy = copy_gimple_bind (stmt, id);
1076 s1 = remap_gimple_seq (gimple_catch_handler (stmt), id);
1077 copy = gimple_build_catch (gimple_catch_types (stmt), s1);
1080 case GIMPLE_EH_FILTER:
1081 s1 = remap_gimple_seq (gimple_eh_filter_failure (stmt), id);
1082 copy = gimple_build_eh_filter (gimple_eh_filter_types (stmt), s1);
1086 s1 = remap_gimple_seq (gimple_try_eval (stmt), id);
1087 s2 = remap_gimple_seq (gimple_try_cleanup (stmt), id);
1088 copy = gimple_build_try (s1, s2, gimple_try_kind (stmt));
1091 case GIMPLE_WITH_CLEANUP_EXPR:
1092 s1 = remap_gimple_seq (gimple_wce_cleanup (stmt), id);
1093 copy = gimple_build_wce (s1);
1096 case GIMPLE_OMP_PARALLEL:
1097 s1 = remap_gimple_seq (gimple_omp_body (stmt), id);
1098 copy = gimple_build_omp_parallel
1100 gimple_omp_parallel_clauses (stmt),
1101 gimple_omp_parallel_child_fn (stmt),
1102 gimple_omp_parallel_data_arg (stmt));
1105 case GIMPLE_OMP_TASK:
1106 s1 = remap_gimple_seq (gimple_omp_body (stmt), id);
1107 copy = gimple_build_omp_task
1109 gimple_omp_task_clauses (stmt),
1110 gimple_omp_task_child_fn (stmt),
1111 gimple_omp_task_data_arg (stmt),
1112 gimple_omp_task_copy_fn (stmt),
1113 gimple_omp_task_arg_size (stmt),
1114 gimple_omp_task_arg_align (stmt));
1117 case GIMPLE_OMP_FOR:
1118 s1 = remap_gimple_seq (gimple_omp_body (stmt), id);
1119 s2 = remap_gimple_seq (gimple_omp_for_pre_body (stmt), id);
1120 copy = gimple_build_omp_for (s1, gimple_omp_for_clauses (stmt),
1121 gimple_omp_for_collapse (stmt), s2);
1124 for (i = 0; i < gimple_omp_for_collapse (stmt); i++)
1126 gimple_omp_for_set_index (copy, i,
1127 gimple_omp_for_index (stmt, i));
1128 gimple_omp_for_set_initial (copy, i,
1129 gimple_omp_for_initial (stmt, i));
1130 gimple_omp_for_set_final (copy, i,
1131 gimple_omp_for_final (stmt, i));
1132 gimple_omp_for_set_incr (copy, i,
1133 gimple_omp_for_incr (stmt, i));
1134 gimple_omp_for_set_cond (copy, i,
1135 gimple_omp_for_cond (stmt, i));
1140 case GIMPLE_OMP_MASTER:
1141 s1 = remap_gimple_seq (gimple_omp_body (stmt), id);
1142 copy = gimple_build_omp_master (s1);
1145 case GIMPLE_OMP_ORDERED:
1146 s1 = remap_gimple_seq (gimple_omp_body (stmt), id);
1147 copy = gimple_build_omp_ordered (s1);
1150 case GIMPLE_OMP_SECTION:
1151 s1 = remap_gimple_seq (gimple_omp_body (stmt), id);
1152 copy = gimple_build_omp_section (s1);
1155 case GIMPLE_OMP_SECTIONS:
1156 s1 = remap_gimple_seq (gimple_omp_body (stmt), id);
1157 copy = gimple_build_omp_sections
1158 (s1, gimple_omp_sections_clauses (stmt));
1161 case GIMPLE_OMP_SINGLE:
1162 s1 = remap_gimple_seq (gimple_omp_body (stmt), id);
1163 copy = gimple_build_omp_single
1164 (s1, gimple_omp_single_clauses (stmt));
1167 case GIMPLE_OMP_CRITICAL:
1168 s1 = remap_gimple_seq (gimple_omp_body (stmt), id);
1170 = gimple_build_omp_critical (s1, gimple_omp_critical_name (stmt));
1179 if (gimple_assign_copy_p (stmt)
1180 && gimple_assign_lhs (stmt) == gimple_assign_rhs1 (stmt)
1181 && auto_var_in_fn_p (gimple_assign_lhs (stmt), id->src_fn))
1183 /* Here we handle statements that are not completely rewritten.
1184 First we detect some inlining-induced bogosities for
1187 /* Some assignments VAR = VAR; don't generate any rtl code
1188 and thus don't count as variable modification. Avoid
1189 keeping bogosities like 0 = 0. */
1190 tree decl = gimple_assign_lhs (stmt), value;
1193 n = (tree *) pointer_map_contains (id->decl_map, decl);
1197 STRIP_TYPE_NOPS (value);
1198 if (TREE_CONSTANT (value) || TREE_READONLY (value))
1199 return gimple_build_nop ();
1203 /* Create a new deep copy of the statement. */
1204 copy = gimple_copy (stmt);
1207 /* If STMT has a block defined, map it to the newly constructed
1208 block. When inlining we want statements without a block to
1209 appear in the block of the function call. */
1210 new_block = id->block;
1211 if (gimple_block (copy))
1214 n = (tree *) pointer_map_contains (id->decl_map, gimple_block (copy));
1219 gimple_set_block (copy, new_block);
1221 /* Remap all the operands in COPY. */
1222 memset (&wi, 0, sizeof (wi));
1225 walk_tree (gimple_op_ptr (copy, 1), remap_gimple_op_r, &wi, NULL);
1227 walk_gimple_op (copy, remap_gimple_op_r, &wi);
1229 /* We have to handle EH region remapping of GIMPLE_RESX specially because
1230 the region number is not an operand. */
1231 if (gimple_code (stmt) == GIMPLE_RESX && id->eh_region_offset)
1233 gimple_resx_set_region (copy, gimple_resx_region (stmt) + id->eh_region_offset);
1239 /* Copy basic block, scale profile accordingly. Edges will be taken care of
1243 copy_bb (copy_body_data *id, basic_block bb, int frequency_scale,
1244 gcov_type count_scale)
1246 gimple_stmt_iterator gsi, copy_gsi, seq_gsi;
1247 basic_block copy_basic_block;
1250 /* create_basic_block() will append every new block to
1251 basic_block_info automatically. */
1252 copy_basic_block = create_basic_block (NULL, (void *) 0,
1253 (basic_block) bb->prev_bb->aux);
1254 copy_basic_block->count = bb->count * count_scale / REG_BR_PROB_BASE;
1256 /* We are going to rebuild frequencies from scratch. These values
1257 have just small importance to drive canonicalize_loop_headers. */
1258 copy_basic_block->frequency = ((gcov_type)bb->frequency
1259 * frequency_scale / REG_BR_PROB_BASE);
1261 if (copy_basic_block->frequency > BB_FREQ_MAX)
1262 copy_basic_block->frequency = BB_FREQ_MAX;
1264 copy_gsi = gsi_start_bb (copy_basic_block);
1266 for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
1268 gimple stmt = gsi_stmt (gsi);
1269 gimple orig_stmt = stmt;
1271 id->regimplify = false;
1272 stmt = remap_gimple_stmt (stmt, id);
1273 if (gimple_nop_p (stmt))
1276 gimple_duplicate_stmt_histograms (cfun, stmt, id->src_cfun, orig_stmt);
1279 /* With return slot optimization we can end up with
1280 non-gimple (foo *)&this->m, fix that here. */
1281 if (is_gimple_assign (stmt)
1282 && gimple_assign_rhs_code (stmt) == NOP_EXPR
1283 && !is_gimple_val (gimple_assign_rhs1 (stmt)))
1286 new_rhs = force_gimple_operand_gsi (&seq_gsi,
1287 gimple_assign_rhs1 (stmt),
1288 true, NULL, true, GSI_SAME_STMT);
1289 gimple_assign_set_rhs1 (stmt, new_rhs);
1290 id->regimplify = false;
1293 gsi_insert_after (&seq_gsi, stmt, GSI_NEW_STMT);
1296 gimple_regimplify_operands (stmt, &seq_gsi);
1298 /* If copy_basic_block has been empty at the start of this iteration,
1299 call gsi_start_bb again to get at the newly added statements. */
1300 if (gsi_end_p (copy_gsi))
1301 copy_gsi = gsi_start_bb (copy_basic_block);
1303 gsi_next (©_gsi);
1305 /* Process the new statement. The call to gimple_regimplify_operands
1306 possibly turned the statement into multiple statements, we
1307 need to process all of them. */
1310 stmt = gsi_stmt (copy_gsi);
1311 if (is_gimple_call (stmt)
1312 && gimple_call_va_arg_pack_p (stmt)
1315 /* __builtin_va_arg_pack () should be replaced by
1316 all arguments corresponding to ... in the caller. */
1319 VEC(tree, heap) *argarray;
1320 size_t nargs = gimple_call_num_args (id->gimple_call);
1323 for (p = DECL_ARGUMENTS (id->src_fn); p; p = TREE_CHAIN (p))
1326 /* Create the new array of arguments. */
1327 n = nargs + gimple_call_num_args (stmt);
1328 argarray = VEC_alloc (tree, heap, n);
1329 VEC_safe_grow (tree, heap, argarray, n);
1331 /* Copy all the arguments before '...' */
1332 memcpy (VEC_address (tree, argarray),
1333 gimple_call_arg_ptr (stmt, 0),
1334 gimple_call_num_args (stmt) * sizeof (tree));
1336 /* Append the arguments passed in '...' */
1337 memcpy (VEC_address(tree, argarray) + gimple_call_num_args (stmt),
1338 gimple_call_arg_ptr (id->gimple_call, 0)
1339 + (gimple_call_num_args (id->gimple_call) - nargs),
1340 nargs * sizeof (tree));
1342 new_call = gimple_build_call_vec (gimple_call_fn (stmt),
1345 VEC_free (tree, heap, argarray);
1347 /* Copy all GIMPLE_CALL flags, location and block, except
1348 GF_CALL_VA_ARG_PACK. */
1349 gimple_call_copy_flags (new_call, stmt);
1350 gimple_call_set_va_arg_pack (new_call, false);
1351 gimple_set_location (new_call, gimple_location (stmt));
1352 gimple_set_block (new_call, gimple_block (stmt));
1353 gimple_call_set_lhs (new_call, gimple_call_lhs (stmt));
1355 gsi_replace (©_gsi, new_call, false);
1356 gimple_set_bb (stmt, NULL);
1359 else if (is_gimple_call (stmt)
1361 && (decl = gimple_call_fndecl (stmt))
1362 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL
1363 && DECL_FUNCTION_CODE (decl) == BUILT_IN_VA_ARG_PACK_LEN)
1365 /* __builtin_va_arg_pack_len () should be replaced by
1366 the number of anonymous arguments. */
1367 size_t nargs = gimple_call_num_args (id->gimple_call);
1371 for (p = DECL_ARGUMENTS (id->src_fn); p; p = TREE_CHAIN (p))
1374 count = build_int_cst (integer_type_node, nargs);
1375 new_stmt = gimple_build_assign (gimple_call_lhs (stmt), count);
1376 gsi_replace (©_gsi, new_stmt, false);
1380 /* Statements produced by inlining can be unfolded, especially
1381 when we constant propagated some operands. We can't fold
1382 them right now for two reasons:
1383 1) folding require SSA_NAME_DEF_STMTs to be correct
1384 2) we can't change function calls to builtins.
1385 So we just mark statement for later folding. We mark
1386 all new statements, instead just statements that has changed
1387 by some nontrivial substitution so even statements made
1388 foldable indirectly are updated. If this turns out to be
1389 expensive, copy_body can be told to watch for nontrivial
1391 if (id->statements_to_fold)
1392 pointer_set_insert (id->statements_to_fold, stmt);
1394 /* We're duplicating a CALL_EXPR. Find any corresponding
1395 callgraph edges and update or duplicate them. */
1396 if (is_gimple_call (stmt))
1398 struct cgraph_node *node;
1399 struct cgraph_edge *edge;
1401 switch (id->transform_call_graph_edges)
1403 case CB_CGE_DUPLICATE:
1404 edge = cgraph_edge (id->src_node, orig_stmt);
1406 cgraph_clone_edge (edge, id->dst_node, stmt,
1407 REG_BR_PROB_BASE, 1,
1408 edge->frequency, true);
1411 case CB_CGE_MOVE_CLONES:
1412 for (node = id->dst_node->next_clone;
1414 node = node->next_clone)
1416 edge = cgraph_edge (node, orig_stmt);
1418 cgraph_set_call_stmt (edge, stmt);
1423 edge = cgraph_edge (id->dst_node, orig_stmt);
1425 cgraph_set_call_stmt (edge, stmt);
1433 /* If you think we can abort here, you are wrong.
1434 There is no region 0 in gimple. */
1435 gcc_assert (lookup_stmt_eh_region_fn (id->src_cfun, orig_stmt) != 0);
1437 if (stmt_could_throw_p (stmt)
1438 /* When we are cloning for inlining, we are supposed to
1439 construct a clone that calls precisely the same functions
1440 as original. However IPA optimizers might've proved
1441 earlier some function calls as non-trapping that might
1442 render some basic blocks dead that might become
1445 We can't update SSA with unreachable blocks in CFG and thus
1446 we prevent the scenario by preserving even the "dead" eh
1447 edges until the point they are later removed by
1449 || (id->transform_call_graph_edges == CB_CGE_MOVE_CLONES
1450 && lookup_stmt_eh_region_fn (id->src_cfun, orig_stmt) > 0))
1452 int region = lookup_stmt_eh_region_fn (id->src_cfun, orig_stmt);
1454 /* Add an entry for the copied tree in the EH hashtable.
1455 When cloning or versioning, use the hashtable in
1456 cfun, and just copy the EH number. When inlining, use the
1457 hashtable in the caller, and adjust the region number. */
1459 add_stmt_to_eh_region (stmt, region + id->eh_region_offset);
1461 /* If this tree doesn't have a region associated with it,
1462 and there is a "current region,"
1463 then associate this tree with the current region
1464 and add edges associated with this region. */
1465 if (lookup_stmt_eh_region_fn (id->src_cfun, orig_stmt) <= 0
1466 && id->eh_region > 0
1467 && stmt_could_throw_p (stmt))
1468 add_stmt_to_eh_region (stmt, id->eh_region);
1471 if (gimple_in_ssa_p (cfun))
1476 find_new_referenced_vars (gsi_stmt (copy_gsi));
1477 FOR_EACH_SSA_TREE_OPERAND (def, stmt, i, SSA_OP_DEF)
1478 if (TREE_CODE (def) == SSA_NAME)
1479 SSA_NAME_DEF_STMT (def) = stmt;
1482 gsi_next (©_gsi);
1484 while (!gsi_end_p (copy_gsi));
1486 copy_gsi = gsi_last_bb (copy_basic_block);
1489 return copy_basic_block;
1492 /* Inserting Single Entry Multiple Exit region in SSA form into code in SSA
1493 form is quite easy, since dominator relationship for old basic blocks does
1496 There is however exception where inlining might change dominator relation
1497 across EH edges from basic block within inlined functions destinating
1498 to landing pads in function we inline into.
1500 The function fills in PHI_RESULTs of such PHI nodes if they refer
1501 to gimple regs. Otherwise, the function mark PHI_RESULT of such
1502 PHI nodes for renaming. For non-gimple regs, renaming is safe: the
1503 EH edges are abnormal and SSA_NAME_OCCURS_IN_ABNORMAL_PHI must be
1504 set, and this means that there will be no overlapping live ranges
1505 for the underlying symbol.
1507 This might change in future if we allow redirecting of EH edges and
1508 we might want to change way build CFG pre-inlining to include
1509 all the possible edges then. */
1511 update_ssa_across_abnormal_edges (basic_block bb, basic_block ret_bb,
1512 bool can_throw, bool nonlocal_goto)
1517 FOR_EACH_EDGE (e, ei, bb->succs)
1519 || ((basic_block)e->dest->aux)->index == ENTRY_BLOCK)
1522 gimple_stmt_iterator si;
1524 gcc_assert (e->flags & EDGE_ABNORMAL);
1527 gcc_assert (e->flags & EDGE_EH);
1530 gcc_assert (!(e->flags & EDGE_EH));
1532 for (si = gsi_start_phis (e->dest); !gsi_end_p (si); gsi_next (&si))
1536 phi = gsi_stmt (si);
1538 /* There shouldn't be any PHI nodes in the ENTRY_BLOCK. */
1539 gcc_assert (!e->dest->aux);
1541 gcc_assert (SSA_NAME_OCCURS_IN_ABNORMAL_PHI (PHI_RESULT (phi)));
1543 if (!is_gimple_reg (PHI_RESULT (phi)))
1545 mark_sym_for_renaming (SSA_NAME_VAR (PHI_RESULT (phi)));
1549 re = find_edge (ret_bb, e->dest);
1551 gcc_assert ((re->flags & (EDGE_EH | EDGE_ABNORMAL))
1552 == (e->flags & (EDGE_EH | EDGE_ABNORMAL)));
1554 SET_USE (PHI_ARG_DEF_PTR_FROM_EDGE (phi, e),
1555 USE_FROM_PTR (PHI_ARG_DEF_PTR_FROM_EDGE (phi, re)));
1561 /* Copy edges from BB into its copy constructed earlier, scale profile
1562 accordingly. Edges will be taken care of later. Assume aux
1563 pointers to point to the copies of each BB. */
1566 copy_edges_for_bb (basic_block bb, gcov_type count_scale, basic_block ret_bb)
1568 basic_block new_bb = (basic_block) bb->aux;
1571 gimple_stmt_iterator si;
1574 /* Use the indices from the original blocks to create edges for the
1576 FOR_EACH_EDGE (old_edge, ei, bb->succs)
1577 if (!(old_edge->flags & EDGE_EH))
1581 flags = old_edge->flags;
1583 /* Return edges do get a FALLTHRU flag when the get inlined. */
1584 if (old_edge->dest->index == EXIT_BLOCK && !old_edge->flags
1585 && old_edge->dest->aux != EXIT_BLOCK_PTR)
1586 flags |= EDGE_FALLTHRU;
1587 new_edge = make_edge (new_bb, (basic_block) old_edge->dest->aux, flags);
1588 new_edge->count = old_edge->count * count_scale / REG_BR_PROB_BASE;
1589 new_edge->probability = old_edge->probability;
1592 if (bb->index == ENTRY_BLOCK || bb->index == EXIT_BLOCK)
1595 for (si = gsi_start_bb (new_bb); !gsi_end_p (si);)
1598 bool can_throw, nonlocal_goto;
1600 copy_stmt = gsi_stmt (si);
1601 update_stmt (copy_stmt);
1602 if (gimple_in_ssa_p (cfun))
1603 mark_symbols_for_renaming (copy_stmt);
1605 /* Do this before the possible split_block. */
1608 /* If this tree could throw an exception, there are two
1609 cases where we need to add abnormal edge(s): the
1610 tree wasn't in a region and there is a "current
1611 region" in the caller; or the original tree had
1612 EH edges. In both cases split the block after the tree,
1613 and add abnormal edge(s) as needed; we need both
1614 those from the callee and the caller.
1615 We check whether the copy can throw, because the const
1616 propagation can change an INDIRECT_REF which throws
1617 into a COMPONENT_REF which doesn't. If the copy
1618 can throw, the original could also throw. */
1619 can_throw = stmt_can_throw_internal (copy_stmt);
1620 nonlocal_goto = stmt_can_make_abnormal_goto (copy_stmt);
1622 if (can_throw || nonlocal_goto)
1624 if (!gsi_end_p (si))
1625 /* Note that bb's predecessor edges aren't necessarily
1626 right at this point; split_block doesn't care. */
1628 edge e = split_block (new_bb, copy_stmt);
1631 new_bb->aux = e->src->aux;
1632 si = gsi_start_bb (new_bb);
1637 make_eh_edges (copy_stmt);
1640 make_abnormal_goto_edges (gimple_bb (copy_stmt), true);
1642 if ((can_throw || nonlocal_goto)
1643 && gimple_in_ssa_p (cfun))
1644 update_ssa_across_abnormal_edges (gimple_bb (copy_stmt), ret_bb,
1645 can_throw, nonlocal_goto);
1649 /* Copy the PHIs. All blocks and edges are copied, some blocks
1650 was possibly split and new outgoing EH edges inserted.
1651 BB points to the block of original function and AUX pointers links
1652 the original and newly copied blocks. */
1655 copy_phis_for_bb (basic_block bb, copy_body_data *id)
1657 basic_block const new_bb = (basic_block) bb->aux;
1660 gimple_stmt_iterator si;
1662 for (si = gsi_start (phi_nodes (bb)); !gsi_end_p (si); gsi_next (&si))
1668 phi = gsi_stmt (si);
1669 res = PHI_RESULT (phi);
1671 if (is_gimple_reg (res))
1673 walk_tree (&new_res, copy_tree_body_r, id, NULL);
1674 SSA_NAME_DEF_STMT (new_res)
1675 = new_phi = create_phi_node (new_res, new_bb);
1676 FOR_EACH_EDGE (new_edge, ei, new_bb->preds)
1679 = find_edge ((basic_block) new_edge->src->aux, bb);
1680 tree arg = PHI_ARG_DEF_FROM_EDGE (phi, old_edge);
1682 tree block = id->block;
1683 id->block = NULL_TREE;
1684 walk_tree (&new_arg, copy_tree_body_r, id, NULL);
1686 gcc_assert (new_arg);
1687 /* With return slot optimization we can end up with
1688 non-gimple (foo *)&this->m, fix that here. */
1689 if (TREE_CODE (new_arg) != SSA_NAME
1690 && TREE_CODE (new_arg) != FUNCTION_DECL
1691 && !is_gimple_val (new_arg))
1693 gimple_seq stmts = NULL;
1694 new_arg = force_gimple_operand (new_arg, &stmts, true, NULL);
1695 gsi_insert_seq_on_edge_immediate (new_edge, stmts);
1697 add_phi_arg (new_phi, new_arg, new_edge);
1704 /* Wrapper for remap_decl so it can be used as a callback. */
1707 remap_decl_1 (tree decl, void *data)
1709 return remap_decl (decl, (copy_body_data *) data);
1712 /* Build struct function and associated datastructures for the new clone
1713 NEW_FNDECL to be build. CALLEE_FNDECL is the original */
1716 initialize_cfun (tree new_fndecl, tree callee_fndecl, gcov_type count,
1719 struct function *src_cfun = DECL_STRUCT_FUNCTION (callee_fndecl);
1720 gcov_type count_scale, frequency_scale;
1722 if (ENTRY_BLOCK_PTR_FOR_FUNCTION (src_cfun)->count)
1723 count_scale = (REG_BR_PROB_BASE * count
1724 / ENTRY_BLOCK_PTR_FOR_FUNCTION (src_cfun)->count);
1728 if (ENTRY_BLOCK_PTR_FOR_FUNCTION (src_cfun)->frequency)
1729 frequency_scale = (REG_BR_PROB_BASE * frequency
1731 ENTRY_BLOCK_PTR_FOR_FUNCTION (src_cfun)->frequency);
1733 frequency_scale = count_scale;
1735 /* Register specific tree functions. */
1736 gimple_register_cfg_hooks ();
1738 /* Get clean struct function. */
1739 push_struct_function (new_fndecl);
1741 /* We will rebuild these, so just sanity check that they are empty. */
1742 gcc_assert (VALUE_HISTOGRAMS (cfun) == NULL);
1743 gcc_assert (cfun->local_decls == NULL);
1744 gcc_assert (cfun->cfg == NULL);
1745 gcc_assert (cfun->decl == new_fndecl);
1747 /* No need to copy; this is initialized later in compilation. */
1748 gcc_assert (!src_cfun->calls_setjmp);
1749 gcc_assert (!src_cfun->calls_alloca);
1751 /* Copy items we preserve during clonning. */
1752 cfun->static_chain_decl = src_cfun->static_chain_decl;
1753 cfun->nonlocal_goto_save_area = src_cfun->nonlocal_goto_save_area;
1754 cfun->function_end_locus = src_cfun->function_end_locus;
1755 cfun->curr_properties = src_cfun->curr_properties;
1756 cfun->last_verified = src_cfun->last_verified;
1757 if (src_cfun->ipa_transforms_to_apply)
1758 cfun->ipa_transforms_to_apply = VEC_copy (ipa_opt_pass, heap,
1759 src_cfun->ipa_transforms_to_apply);
1760 cfun->va_list_gpr_size = src_cfun->va_list_gpr_size;
1761 cfun->va_list_fpr_size = src_cfun->va_list_fpr_size;
1762 cfun->function_frequency = src_cfun->function_frequency;
1763 cfun->has_nonlocal_label = src_cfun->has_nonlocal_label;
1764 cfun->stdarg = src_cfun->stdarg;
1765 cfun->dont_save_pending_sizes_p = src_cfun->dont_save_pending_sizes_p;
1766 cfun->after_inlining = src_cfun->after_inlining;
1767 cfun->returns_struct = src_cfun->returns_struct;
1768 cfun->returns_pcc_struct = src_cfun->returns_pcc_struct;
1769 cfun->after_tree_profile = src_cfun->after_tree_profile;
1771 init_empty_tree_cfg ();
1773 ENTRY_BLOCK_PTR->count =
1774 (ENTRY_BLOCK_PTR_FOR_FUNCTION (src_cfun)->count * count_scale /
1776 ENTRY_BLOCK_PTR->frequency =
1777 (ENTRY_BLOCK_PTR_FOR_FUNCTION (src_cfun)->frequency *
1778 frequency_scale / REG_BR_PROB_BASE);
1779 EXIT_BLOCK_PTR->count =
1780 (EXIT_BLOCK_PTR_FOR_FUNCTION (src_cfun)->count * count_scale /
1782 EXIT_BLOCK_PTR->frequency =
1783 (EXIT_BLOCK_PTR_FOR_FUNCTION (src_cfun)->frequency *
1784 frequency_scale / REG_BR_PROB_BASE);
1786 init_eh_for_function ();
1788 if (src_cfun->gimple_df)
1790 init_tree_ssa (cfun);
1791 cfun->gimple_df->in_ssa_p = true;
1792 init_ssa_operands ();
1797 /* Make a copy of the body of FN so that it can be inserted inline in
1798 another function. Walks FN via CFG, returns new fndecl. */
1801 copy_cfg_body (copy_body_data * id, gcov_type count, int frequency,
1802 basic_block entry_block_map, basic_block exit_block_map)
1804 tree callee_fndecl = id->src_fn;
1805 /* Original cfun for the callee, doesn't change. */
1806 struct function *src_cfun = DECL_STRUCT_FUNCTION (callee_fndecl);
1807 struct function *cfun_to_copy;
1809 tree new_fndecl = NULL;
1810 gcov_type count_scale, frequency_scale;
1813 if (ENTRY_BLOCK_PTR_FOR_FUNCTION (src_cfun)->count)
1814 count_scale = (REG_BR_PROB_BASE * count
1815 / ENTRY_BLOCK_PTR_FOR_FUNCTION (src_cfun)->count);
1819 if (ENTRY_BLOCK_PTR_FOR_FUNCTION (src_cfun)->frequency)
1820 frequency_scale = (REG_BR_PROB_BASE * frequency
1822 ENTRY_BLOCK_PTR_FOR_FUNCTION (src_cfun)->frequency);
1824 frequency_scale = count_scale;
1826 /* Register specific tree functions. */
1827 gimple_register_cfg_hooks ();
1829 /* Must have a CFG here at this point. */
1830 gcc_assert (ENTRY_BLOCK_PTR_FOR_FUNCTION
1831 (DECL_STRUCT_FUNCTION (callee_fndecl)));
1833 cfun_to_copy = id->src_cfun = DECL_STRUCT_FUNCTION (callee_fndecl);
1835 ENTRY_BLOCK_PTR_FOR_FUNCTION (cfun_to_copy)->aux = entry_block_map;
1836 EXIT_BLOCK_PTR_FOR_FUNCTION (cfun_to_copy)->aux = exit_block_map;
1837 entry_block_map->aux = ENTRY_BLOCK_PTR_FOR_FUNCTION (cfun_to_copy);
1838 exit_block_map->aux = EXIT_BLOCK_PTR_FOR_FUNCTION (cfun_to_copy);
1840 /* Duplicate any exception-handling regions. */
1843 id->eh_region_offset
1844 = duplicate_eh_regions (cfun_to_copy, remap_decl_1, id,
1848 /* Use aux pointers to map the original blocks to copy. */
1849 FOR_EACH_BB_FN (bb, cfun_to_copy)
1851 basic_block new_bb = copy_bb (id, bb, frequency_scale, count_scale);
1856 last = last_basic_block;
1858 /* Now that we've duplicated the blocks, duplicate their edges. */
1859 FOR_ALL_BB_FN (bb, cfun_to_copy)
1860 copy_edges_for_bb (bb, count_scale, exit_block_map);
1862 if (gimple_in_ssa_p (cfun))
1863 FOR_ALL_BB_FN (bb, cfun_to_copy)
1864 copy_phis_for_bb (bb, id);
1866 FOR_ALL_BB_FN (bb, cfun_to_copy)
1868 ((basic_block)bb->aux)->aux = NULL;
1872 /* Zero out AUX fields of newly created block during EH edge
1874 for (; last < last_basic_block; last++)
1875 BASIC_BLOCK (last)->aux = NULL;
1876 entry_block_map->aux = NULL;
1877 exit_block_map->aux = NULL;
1883 copy_body (copy_body_data *id, gcov_type count, int frequency,
1884 basic_block entry_block_map, basic_block exit_block_map)
1886 tree fndecl = id->src_fn;
1889 /* If this body has a CFG, walk CFG and copy. */
1890 gcc_assert (ENTRY_BLOCK_PTR_FOR_FUNCTION (DECL_STRUCT_FUNCTION (fndecl)));
1891 body = copy_cfg_body (id, count, frequency, entry_block_map, exit_block_map);
1896 /* Return true if VALUE is an ADDR_EXPR of an automatic variable
1897 defined in function FN, or of a data member thereof. */
1900 self_inlining_addr_expr (tree value, tree fn)
1904 if (TREE_CODE (value) != ADDR_EXPR)
1907 var = get_base_address (TREE_OPERAND (value, 0));
1909 return var && auto_var_in_fn_p (var, fn);
1913 insert_init_stmt (basic_block bb, gimple init_stmt)
1915 /* If VAR represents a zero-sized variable, it's possible that the
1916 assignment statement may result in no gimple statements. */
1919 gimple_stmt_iterator si = gsi_last_bb (bb);
1921 /* We can end up with init statements that store to a non-register
1922 from a rhs with a conversion. Handle that here by forcing the
1923 rhs into a temporary. gimple_regimplify_operands is not
1924 prepared to do this for us. */
1925 if (!is_gimple_reg (gimple_assign_lhs (init_stmt))
1926 && is_gimple_reg_type (TREE_TYPE (gimple_assign_lhs (init_stmt)))
1927 && gimple_assign_rhs_class (init_stmt) == GIMPLE_UNARY_RHS)
1929 tree rhs = build1 (gimple_assign_rhs_code (init_stmt),
1930 gimple_expr_type (init_stmt),
1931 gimple_assign_rhs1 (init_stmt));
1932 rhs = force_gimple_operand_gsi (&si, rhs, true, NULL_TREE, false,
1934 gimple_assign_set_rhs_code (init_stmt, TREE_CODE (rhs));
1935 gimple_assign_set_rhs1 (init_stmt, rhs);
1937 gsi_insert_after (&si, init_stmt, GSI_NEW_STMT);
1938 gimple_regimplify_operands (init_stmt, &si);
1939 mark_symbols_for_renaming (init_stmt);
1943 /* Initialize parameter P with VALUE. If needed, produce init statement
1944 at the end of BB. When BB is NULL, we return init statement to be
1947 setup_one_parameter (copy_body_data *id, tree p, tree value, tree fn,
1948 basic_block bb, tree *vars)
1950 gimple init_stmt = NULL;
1953 tree def = (gimple_in_ssa_p (cfun)
1954 ? gimple_default_def (id->src_cfun, p) : NULL);
1957 && value != error_mark_node
1958 && !useless_type_conversion_p (TREE_TYPE (p), TREE_TYPE (value)))
1960 if (fold_convertible_p (TREE_TYPE (p), value))
1961 rhs = fold_build1 (NOP_EXPR, TREE_TYPE (p), value);
1963 /* ??? For valid (GIMPLE) programs we should not end up here.
1964 Still if something has gone wrong and we end up with truly
1965 mismatched types here, fall back to using a VIEW_CONVERT_EXPR
1966 to not leak invalid GIMPLE to the following passes. */
1967 rhs = fold_build1 (VIEW_CONVERT_EXPR, TREE_TYPE (p), value);
1970 /* If the parameter is never assigned to, has no SSA_NAMEs created,
1971 we may not need to create a new variable here at all. Instead, we may
1972 be able to just use the argument value. */
1973 if (TREE_READONLY (p)
1974 && !TREE_ADDRESSABLE (p)
1975 && value && !TREE_SIDE_EFFECTS (value)
1978 /* We may produce non-gimple trees by adding NOPs or introduce
1979 invalid sharing when operand is not really constant.
1980 It is not big deal to prohibit constant propagation here as
1981 we will constant propagate in DOM1 pass anyway. */
1982 if (is_gimple_min_invariant (value)
1983 && useless_type_conversion_p (TREE_TYPE (p),
1985 /* We have to be very careful about ADDR_EXPR. Make sure
1986 the base variable isn't a local variable of the inlined
1987 function, e.g., when doing recursive inlining, direct or
1988 mutually-recursive or whatever, which is why we don't
1989 just test whether fn == current_function_decl. */
1990 && ! self_inlining_addr_expr (value, fn))
1992 insert_decl_map (id, p, value);
1997 /* Make an equivalent VAR_DECL. Note that we must NOT remap the type
1998 here since the type of this decl must be visible to the calling
2000 var = copy_decl_to_var (p, id);
2001 if (gimple_in_ssa_p (cfun) && TREE_CODE (var) == VAR_DECL)
2004 add_referenced_var (var);
2007 /* Register the VAR_DECL as the equivalent for the PARM_DECL;
2008 that way, when the PARM_DECL is encountered, it will be
2009 automatically replaced by the VAR_DECL. */
2010 insert_decl_map (id, p, var);
2012 /* Declare this new variable. */
2013 TREE_CHAIN (var) = *vars;
2016 /* Make gimplifier happy about this variable. */
2017 DECL_SEEN_IN_BIND_EXPR_P (var) = 1;
2019 /* Even if P was TREE_READONLY, the new VAR should not be.
2020 In the original code, we would have constructed a
2021 temporary, and then the function body would have never
2022 changed the value of P. However, now, we will be
2023 constructing VAR directly. The constructor body may
2024 change its value multiple times as it is being
2025 constructed. Therefore, it must not be TREE_READONLY;
2026 the back-end assumes that TREE_READONLY variable is
2027 assigned to only once. */
2028 if (TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (p)))
2029 TREE_READONLY (var) = 0;
2031 /* If there is no setup required and we are in SSA, take the easy route
2032 replacing all SSA names representing the function parameter by the
2033 SSA name passed to function.
2035 We need to construct map for the variable anyway as it might be used
2036 in different SSA names when parameter is set in function.
2038 FIXME: This usually kills the last connection in between inlined
2039 function parameter and the actual value in debug info. Can we do
2040 better here? If we just inserted the statement, copy propagation
2041 would kill it anyway as it always did in older versions of GCC.
2043 We might want to introduce a notion that single SSA_NAME might
2044 represent multiple variables for purposes of debugging. */
2045 if (gimple_in_ssa_p (cfun) && rhs && def && is_gimple_reg (p)
2046 && (TREE_CODE (rhs) == SSA_NAME
2047 || is_gimple_min_invariant (rhs))
2048 && !SSA_NAME_OCCURS_IN_ABNORMAL_PHI (def))
2050 insert_decl_map (id, def, rhs);
2054 /* If the value of argument is never used, don't care about initializing
2056 if (gimple_in_ssa_p (cfun) && !def && is_gimple_reg (p))
2058 gcc_assert (!value || !TREE_SIDE_EFFECTS (value));
2062 /* Initialize this VAR_DECL from the equivalent argument. Convert
2063 the argument to the proper type in case it was promoted. */
2066 if (rhs == error_mark_node)
2068 insert_decl_map (id, p, var);
2072 STRIP_USELESS_TYPE_CONVERSION (rhs);
2074 /* We want to use MODIFY_EXPR, not INIT_EXPR here so that we
2075 keep our trees in gimple form. */
2076 if (def && gimple_in_ssa_p (cfun) && is_gimple_reg (p))
2078 def = remap_ssa_name (def, id);
2079 init_stmt = gimple_build_assign (def, rhs);
2080 SSA_NAME_IS_DEFAULT_DEF (def) = 0;
2081 set_default_def (var, NULL);
2084 init_stmt = gimple_build_assign (var, rhs);
2086 if (bb && init_stmt)
2087 insert_init_stmt (bb, init_stmt);
2092 /* Generate code to initialize the parameters of the function at the
2093 top of the stack in ID from the GIMPLE_CALL STMT. */
2096 initialize_inlined_parameters (copy_body_data *id, gimple stmt,
2097 tree fn, basic_block bb)
2102 tree vars = NULL_TREE;
2103 tree static_chain = gimple_call_chain (stmt);
2105 /* Figure out what the parameters are. */
2106 parms = DECL_ARGUMENTS (fn);
2108 /* Loop through the parameter declarations, replacing each with an
2109 equivalent VAR_DECL, appropriately initialized. */
2110 for (p = parms, i = 0; p; p = TREE_CHAIN (p), i++)
2113 val = i < gimple_call_num_args (stmt) ? gimple_call_arg (stmt, i) : NULL;
2114 setup_one_parameter (id, p, val, fn, bb, &vars);
2117 /* Initialize the static chain. */
2118 p = DECL_STRUCT_FUNCTION (fn)->static_chain_decl;
2119 gcc_assert (fn != current_function_decl);
2122 /* No static chain? Seems like a bug in tree-nested.c. */
2123 gcc_assert (static_chain);
2125 setup_one_parameter (id, p, static_chain, fn, bb, &vars);
2128 declare_inline_vars (id->block, vars);
2132 /* Declare a return variable to replace the RESULT_DECL for the
2133 function we are calling. An appropriate DECL_STMT is returned.
2134 The USE_STMT is filled to contain a use of the declaration to
2135 indicate the return value of the function.
2137 RETURN_SLOT, if non-null is place where to store the result. It
2138 is set only for CALL_EXPR_RETURN_SLOT_OPT. MODIFY_DEST, if non-null,
2139 was the LHS of the MODIFY_EXPR to which this call is the RHS.
2141 The return value is a (possibly null) value that is the result of the
2142 function as seen by the callee. *USE_P is a (possibly null) value that
2143 holds the result as seen by the caller. */
2146 declare_return_variable (copy_body_data *id, tree return_slot, tree modify_dest,
2149 tree callee = id->src_fn;
2150 tree caller = id->dst_fn;
2151 tree result = DECL_RESULT (callee);
2152 tree callee_type = TREE_TYPE (result);
2153 tree caller_type = TREE_TYPE (TREE_TYPE (callee));
2156 /* We don't need to do anything for functions that don't return
2158 if (!result || VOID_TYPE_P (callee_type))
2164 /* If there was a return slot, then the return value is the
2165 dereferenced address of that object. */
2168 /* The front end shouldn't have used both return_slot and
2169 a modify expression. */
2170 gcc_assert (!modify_dest);
2171 if (DECL_BY_REFERENCE (result))
2173 tree return_slot_addr = build_fold_addr_expr (return_slot);
2174 STRIP_USELESS_TYPE_CONVERSION (return_slot_addr);
2176 /* We are going to construct *&return_slot and we can't do that
2177 for variables believed to be not addressable.
2179 FIXME: This check possibly can match, because values returned
2180 via return slot optimization are not believed to have address
2181 taken by alias analysis. */
2182 gcc_assert (TREE_CODE (return_slot) != SSA_NAME);
2183 if (gimple_in_ssa_p (cfun))
2185 HOST_WIDE_INT bitsize;
2186 HOST_WIDE_INT bitpos;
2188 enum machine_mode mode;
2192 base = get_inner_reference (return_slot, &bitsize, &bitpos,
2194 &mode, &unsignedp, &volatilep,
2196 if (TREE_CODE (base) == INDIRECT_REF)
2197 base = TREE_OPERAND (base, 0);
2198 if (TREE_CODE (base) == SSA_NAME)
2199 base = SSA_NAME_VAR (base);
2200 mark_sym_for_renaming (base);
2202 var = return_slot_addr;
2207 gcc_assert (TREE_CODE (var) != SSA_NAME);
2208 TREE_ADDRESSABLE (var) |= TREE_ADDRESSABLE (result);
2210 if ((TREE_CODE (TREE_TYPE (result)) == COMPLEX_TYPE
2211 || TREE_CODE (TREE_TYPE (result)) == VECTOR_TYPE)
2212 && !DECL_GIMPLE_REG_P (result)
2214 DECL_GIMPLE_REG_P (var) = 0;
2219 /* All types requiring non-trivial constructors should have been handled. */
2220 gcc_assert (!TREE_ADDRESSABLE (callee_type));
2222 /* Attempt to avoid creating a new temporary variable. */
2224 && TREE_CODE (modify_dest) != SSA_NAME)
2226 bool use_it = false;
2228 /* We can't use MODIFY_DEST if there's type promotion involved. */
2229 if (!useless_type_conversion_p (callee_type, caller_type))
2232 /* ??? If we're assigning to a variable sized type, then we must
2233 reuse the destination variable, because we've no good way to
2234 create variable sized temporaries at this point. */
2235 else if (TREE_CODE (TYPE_SIZE_UNIT (caller_type)) != INTEGER_CST)
2238 /* If the callee cannot possibly modify MODIFY_DEST, then we can
2239 reuse it as the result of the call directly. Don't do this if
2240 it would promote MODIFY_DEST to addressable. */
2241 else if (TREE_ADDRESSABLE (result))
2245 tree base_m = get_base_address (modify_dest);
2247 /* If the base isn't a decl, then it's a pointer, and we don't
2248 know where that's going to go. */
2249 if (!DECL_P (base_m))
2251 else if (is_global_var (base_m))
2253 else if ((TREE_CODE (TREE_TYPE (result)) == COMPLEX_TYPE
2254 || TREE_CODE (TREE_TYPE (result)) == VECTOR_TYPE)
2255 && !DECL_GIMPLE_REG_P (result)
2256 && DECL_GIMPLE_REG_P (base_m))
2258 else if (!TREE_ADDRESSABLE (base_m))
2270 gcc_assert (TREE_CODE (TYPE_SIZE_UNIT (callee_type)) == INTEGER_CST);
2272 var = copy_result_decl_to_var (result, id);
2273 if (gimple_in_ssa_p (cfun))
2276 add_referenced_var (var);
2279 DECL_SEEN_IN_BIND_EXPR_P (var) = 1;
2280 DECL_STRUCT_FUNCTION (caller)->local_decls
2281 = tree_cons (NULL_TREE, var,
2282 DECL_STRUCT_FUNCTION (caller)->local_decls);
2284 /* Do not have the rest of GCC warn about this variable as it should
2285 not be visible to the user. */
2286 TREE_NO_WARNING (var) = 1;
2288 declare_inline_vars (id->block, var);
2290 /* Build the use expr. If the return type of the function was
2291 promoted, convert it back to the expected type. */
2293 if (!useless_type_conversion_p (caller_type, TREE_TYPE (var)))
2294 use = fold_convert (caller_type, var);
2296 STRIP_USELESS_TYPE_CONVERSION (use);
2298 if (DECL_BY_REFERENCE (result))
2299 var = build_fold_addr_expr (var);
2302 /* Register the VAR_DECL as the equivalent for the RESULT_DECL; that
2303 way, when the RESULT_DECL is encountered, it will be
2304 automatically replaced by the VAR_DECL. */
2305 insert_decl_map (id, result, var);
2307 /* Remember this so we can ignore it in remap_decls. */
2314 /* Returns nonzero if a function can be inlined as a tree. */
2317 tree_inlinable_function_p (tree fn)
2319 bool ret = inlinable_function_p (fn);
2321 if (getenv ("TUPLES_INLINE"))
2322 fprintf (stderr, "Function %s is %sinlinable\n", get_name (fn),
2328 static const char *inline_forbidden_reason;
2330 /* A callback for walk_gimple_seq to handle tree operands. Returns
2331 NULL_TREE if a function can be inlined, otherwise sets the reason
2332 why not and returns a tree representing the offending operand. */
2335 inline_forbidden_p_op (tree *nodep, int *walk_subtrees ATTRIBUTE_UNUSED,
2336 void *fnp ATTRIBUTE_UNUSED)
2341 if (TREE_CODE (node) == RECORD_TYPE || TREE_CODE (node) == UNION_TYPE)
2343 /* We cannot inline a function of the form
2345 void F (int i) { struct S { int ar[i]; } s; }
2347 Attempting to do so produces a catch-22.
2348 If walk_tree examines the TYPE_FIELDS chain of RECORD_TYPE/
2349 UNION_TYPE nodes, then it goes into infinite recursion on a
2350 structure containing a pointer to its own type. If it doesn't,
2351 then the type node for S doesn't get adjusted properly when
2354 ??? This is likely no longer true, but it's too late in the 4.0
2355 cycle to try to find out. This should be checked for 4.1. */
2356 for (t = TYPE_FIELDS (node); t; t = TREE_CHAIN (t))
2357 if (variably_modified_type_p (TREE_TYPE (t), NULL))
2359 inline_forbidden_reason
2360 = G_("function %q+F can never be inlined "
2361 "because it uses variable sized variables");
2370 /* A callback for walk_gimple_seq to handle statements. Returns
2371 non-NULL iff a function can not be inlined. Also sets the reason
2375 inline_forbidden_p_stmt (gimple_stmt_iterator *gsi, bool *handled_ops_p,
2376 struct walk_stmt_info *wip)
2378 tree fn = (tree) wip->info;
2380 gimple stmt = gsi_stmt (*gsi);
2382 switch (gimple_code (stmt))
2385 /* Refuse to inline alloca call unless user explicitly forced so as
2386 this may change program's memory overhead drastically when the
2387 function using alloca is called in loop. In GCC present in
2388 SPEC2000 inlining into schedule_block cause it to require 2GB of
2389 RAM instead of 256MB. */
2390 if (gimple_alloca_call_p (stmt)
2391 && !lookup_attribute ("always_inline", DECL_ATTRIBUTES (fn)))
2393 inline_forbidden_reason
2394 = G_("function %q+F can never be inlined because it uses "
2395 "alloca (override using the always_inline attribute)");
2396 *handled_ops_p = true;
2400 t = gimple_call_fndecl (stmt);
2404 /* We cannot inline functions that call setjmp. */
2405 if (setjmp_call_p (t))
2407 inline_forbidden_reason
2408 = G_("function %q+F can never be inlined because it uses setjmp");
2409 *handled_ops_p = true;
2413 if (DECL_BUILT_IN_CLASS (t) == BUILT_IN_NORMAL)
2414 switch (DECL_FUNCTION_CODE (t))
2416 /* We cannot inline functions that take a variable number of
2418 case BUILT_IN_VA_START:
2419 case BUILT_IN_NEXT_ARG:
2420 case BUILT_IN_VA_END:
2421 inline_forbidden_reason
2422 = G_("function %q+F can never be inlined because it "
2423 "uses variable argument lists");
2424 *handled_ops_p = true;
2427 case BUILT_IN_LONGJMP:
2428 /* We can't inline functions that call __builtin_longjmp at
2429 all. The non-local goto machinery really requires the
2430 destination be in a different function. If we allow the
2431 function calling __builtin_longjmp to be inlined into the
2432 function calling __builtin_setjmp, Things will Go Awry. */
2433 inline_forbidden_reason
2434 = G_("function %q+F can never be inlined because "
2435 "it uses setjmp-longjmp exception handling");
2436 *handled_ops_p = true;
2439 case BUILT_IN_NONLOCAL_GOTO:
2441 inline_forbidden_reason
2442 = G_("function %q+F can never be inlined because "
2443 "it uses non-local goto");
2444 *handled_ops_p = true;
2447 case BUILT_IN_RETURN:
2448 case BUILT_IN_APPLY_ARGS:
2449 /* If a __builtin_apply_args caller would be inlined,
2450 it would be saving arguments of the function it has
2451 been inlined into. Similarly __builtin_return would
2452 return from the function the inline has been inlined into. */
2453 inline_forbidden_reason
2454 = G_("function %q+F can never be inlined because "
2455 "it uses __builtin_return or __builtin_apply_args");
2456 *handled_ops_p = true;
2465 t = gimple_goto_dest (stmt);
2467 /* We will not inline a function which uses computed goto. The
2468 addresses of its local labels, which may be tucked into
2469 global storage, are of course not constant across
2470 instantiations, which causes unexpected behavior. */
2471 if (TREE_CODE (t) != LABEL_DECL)
2473 inline_forbidden_reason
2474 = G_("function %q+F can never be inlined "
2475 "because it contains a computed goto");
2476 *handled_ops_p = true;
2482 t = gimple_label_label (stmt);
2483 if (DECL_NONLOCAL (t))
2485 /* We cannot inline a function that receives a non-local goto
2486 because we cannot remap the destination label used in the
2487 function that is performing the non-local goto. */
2488 inline_forbidden_reason
2489 = G_("function %q+F can never be inlined "
2490 "because it receives a non-local goto");
2491 *handled_ops_p = true;
2500 *handled_ops_p = false;
2506 inline_forbidden_p_2 (tree *nodep, int *walk_subtrees,
2510 tree fn = (tree) fnp;
2512 if (TREE_CODE (node) == LABEL_DECL && DECL_CONTEXT (node) == fn)
2514 inline_forbidden_reason
2515 = G_("function %q+F can never be inlined "
2516 "because it saves address of local label in a static variable");
2526 /* Return true if FNDECL is a function that cannot be inlined into
2530 inline_forbidden_p (tree fndecl)
2532 location_t saved_loc = input_location;
2533 struct function *fun = DECL_STRUCT_FUNCTION (fndecl);
2535 struct walk_stmt_info wi;
2536 struct pointer_set_t *visited_nodes;
2538 bool forbidden_p = false;
2540 visited_nodes = pointer_set_create ();
2541 memset (&wi, 0, sizeof (wi));
2542 wi.info = (void *) fndecl;
2543 wi.pset = visited_nodes;
2545 FOR_EACH_BB_FN (bb, fun)
2548 gimple_seq seq = bb_seq (bb);
2549 ret = walk_gimple_seq (seq, inline_forbidden_p_stmt,
2550 inline_forbidden_p_op, &wi);
2551 forbidden_p = (ret != NULL);
2556 for (step = fun->local_decls; step; step = TREE_CHAIN (step))
2558 tree decl = TREE_VALUE (step);
2559 if (TREE_CODE (decl) == VAR_DECL
2560 && TREE_STATIC (decl)
2561 && !DECL_EXTERNAL (decl)
2562 && DECL_INITIAL (decl))
2565 ret = walk_tree_without_duplicates (&DECL_INITIAL (decl),
2566 inline_forbidden_p_2, fndecl);
2567 forbidden_p = (ret != NULL);
2574 pointer_set_destroy (visited_nodes);
2575 input_location = saved_loc;
2579 /* Returns nonzero if FN is a function that does not have any
2580 fundamental inline blocking properties. */
2583 inlinable_function_p (tree fn)
2585 bool inlinable = true;
2589 /* If we've already decided this function shouldn't be inlined,
2590 there's no need to check again. */
2591 if (DECL_UNINLINABLE (fn))
2594 /* We only warn for functions declared `inline' by the user. */
2595 do_warning = (warn_inline
2596 && DECL_DECLARED_INLINE_P (fn)
2597 && !DECL_IN_SYSTEM_HEADER (fn));
2599 always_inline = lookup_attribute ("always_inline", DECL_ATTRIBUTES (fn));
2602 && always_inline == NULL)
2605 warning (OPT_Winline, "function %q+F can never be inlined because it "
2606 "is suppressed using -fno-inline", fn);
2610 /* Don't auto-inline anything that might not be bound within
2611 this unit of translation. */
2612 else if (!DECL_DECLARED_INLINE_P (fn)
2613 && DECL_REPLACEABLE_P (fn))
2616 else if (!function_attribute_inlinable_p (fn))
2619 warning (OPT_Winline, "function %q+F can never be inlined because it "
2620 "uses attributes conflicting with inlining", fn);
2624 else if (inline_forbidden_p (fn))
2626 /* See if we should warn about uninlinable functions. Previously,
2627 some of these warnings would be issued while trying to expand
2628 the function inline, but that would cause multiple warnings
2629 about functions that would for example call alloca. But since
2630 this a property of the function, just one warning is enough.
2631 As a bonus we can now give more details about the reason why a
2632 function is not inlinable. */
2634 sorry (inline_forbidden_reason, fn);
2635 else if (do_warning)
2636 warning (OPT_Winline, inline_forbidden_reason, fn);
2641 /* Squirrel away the result so that we don't have to check again. */
2642 DECL_UNINLINABLE (fn) = !inlinable;
2647 /* Estimate the cost of a memory move. Use machine dependent
2648 word size and take possible memcpy call into account. */
2651 estimate_move_cost (tree type)
2655 size = int_size_in_bytes (type);
2657 if (size < 0 || size > MOVE_MAX_PIECES * MOVE_RATIO (!optimize_size))
2658 /* Cost of a memcpy call, 3 arguments and the call. */
2661 return ((size + MOVE_MAX_PIECES - 1) / MOVE_MAX_PIECES);
2664 /* Returns cost of operation CODE, according to WEIGHTS */
2667 estimate_operator_cost (enum tree_code code, eni_weights *weights)
2671 /* These are "free" conversions, or their presumed cost
2672 is folded into other operations. */
2679 /* Assign cost of 1 to usual operations.
2680 ??? We may consider mapping RTL costs to this. */
2685 case POINTER_PLUS_EXPR:
2689 case FIXED_CONVERT_EXPR:
2690 case FIX_TRUNC_EXPR:
2702 case VEC_LSHIFT_EXPR:
2703 case VEC_RSHIFT_EXPR:
2710 case TRUTH_ANDIF_EXPR:
2711 case TRUTH_ORIF_EXPR:
2712 case TRUTH_AND_EXPR:
2714 case TRUTH_XOR_EXPR:
2715 case TRUTH_NOT_EXPR:
2724 case UNORDERED_EXPR:
2735 case PREDECREMENT_EXPR:
2736 case PREINCREMENT_EXPR:
2737 case POSTDECREMENT_EXPR:
2738 case POSTINCREMENT_EXPR:
2740 case REALIGN_LOAD_EXPR:
2742 case REDUC_MAX_EXPR:
2743 case REDUC_MIN_EXPR:
2744 case REDUC_PLUS_EXPR:
2745 case WIDEN_SUM_EXPR:
2746 case WIDEN_MULT_EXPR:
2749 case VEC_WIDEN_MULT_HI_EXPR:
2750 case VEC_WIDEN_MULT_LO_EXPR:
2751 case VEC_UNPACK_HI_EXPR:
2752 case VEC_UNPACK_LO_EXPR:
2753 case VEC_UNPACK_FLOAT_HI_EXPR:
2754 case VEC_UNPACK_FLOAT_LO_EXPR:
2755 case VEC_PACK_TRUNC_EXPR:
2756 case VEC_PACK_SAT_EXPR:
2757 case VEC_PACK_FIX_TRUNC_EXPR:
2758 case VEC_EXTRACT_EVEN_EXPR:
2759 case VEC_EXTRACT_ODD_EXPR:
2760 case VEC_INTERLEAVE_HIGH_EXPR:
2761 case VEC_INTERLEAVE_LOW_EXPR:
2765 /* Few special cases of expensive operations. This is useful
2766 to avoid inlining on functions having too many of these. */
2767 case TRUNC_DIV_EXPR:
2769 case FLOOR_DIV_EXPR:
2770 case ROUND_DIV_EXPR:
2771 case EXACT_DIV_EXPR:
2772 case TRUNC_MOD_EXPR:
2774 case FLOOR_MOD_EXPR:
2775 case ROUND_MOD_EXPR:
2777 return weights->div_mod_cost;
2780 /* We expect a copy assignment with no operator. */
2781 gcc_assert (get_gimple_rhs_class (code) == GIMPLE_SINGLE_RHS);
2787 /* Estimate number of instructions that will be created by expanding
2788 the statements in the statement sequence STMTS.
2789 WEIGHTS contains weights attributed to various constructs. */
2792 int estimate_num_insns_seq (gimple_seq stmts, eni_weights *weights)
2795 gimple_stmt_iterator gsi;
2798 for (gsi = gsi_start (stmts); !gsi_end_p (gsi); gsi_next (&gsi))
2799 cost += estimate_num_insns (gsi_stmt (gsi), weights);
2805 /* Estimate number of instructions that will be created by expanding STMT.
2806 WEIGHTS contains weights attributed to various constructs. */
2809 estimate_num_insns (gimple stmt, eni_weights *weights)
2812 enum gimple_code code = gimple_code (stmt);
2818 /* Try to estimate the cost of assignments. We have three cases to
2820 1) Simple assignments to registers;
2821 2) Stores to things that must live in memory. This includes
2822 "normal" stores to scalars, but also assignments of large
2823 structures, or constructors of big arrays;
2825 Let us look at the first two cases, assuming we have "a = b + C":
2826 <GIMPLE_ASSIGN <var_decl "a">
2827 <plus_expr <var_decl "b"> <constant C>>
2828 If "a" is a GIMPLE register, the assignment to it is free on almost
2829 any target, because "a" usually ends up in a real register. Hence
2830 the only cost of this expression comes from the PLUS_EXPR, and we
2831 can ignore the GIMPLE_ASSIGN.
2832 If "a" is not a GIMPLE register, the assignment to "a" will most
2833 likely be a real store, so the cost of the GIMPLE_ASSIGN is the cost
2834 of moving something into "a", which we compute using the function
2835 estimate_move_cost. */
2836 lhs = gimple_assign_lhs (stmt);
2837 if (is_gimple_reg (lhs))
2840 cost = estimate_move_cost (TREE_TYPE (lhs));
2842 cost += estimate_operator_cost (gimple_assign_rhs_code (stmt), weights);
2846 cost = 1 + estimate_operator_cost (gimple_cond_code (stmt), weights);
2850 /* Take into account cost of the switch + guess 2 conditional jumps for
2853 TODO: once the switch expansion logic is sufficiently separated, we can
2854 do better job on estimating cost of the switch. */
2855 cost = gimple_switch_num_labels (stmt) * 2;
2860 tree decl = gimple_call_fndecl (stmt);
2861 tree addr = gimple_call_fn (stmt);
2862 tree funtype = TREE_TYPE (addr);
2864 if (POINTER_TYPE_P (funtype))
2865 funtype = TREE_TYPE (funtype);
2867 if (decl && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_MD)
2868 cost = weights->target_builtin_call_cost;
2870 cost = weights->call_cost;
2872 if (decl && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
2873 switch (DECL_FUNCTION_CODE (decl))
2875 case BUILT_IN_CONSTANT_P:
2877 case BUILT_IN_EXPECT:
2881 /* Prefetch instruction is not expensive. */
2882 case BUILT_IN_PREFETCH:
2883 cost = weights->target_builtin_call_cost;
2891 funtype = TREE_TYPE (decl);
2893 /* Our cost must be kept in sync with
2894 cgraph_estimate_size_after_inlining that does use function
2895 declaration to figure out the arguments. */
2896 if (decl && DECL_ARGUMENTS (decl))
2899 for (arg = DECL_ARGUMENTS (decl); arg; arg = TREE_CHAIN (arg))
2900 cost += estimate_move_cost (TREE_TYPE (arg));
2902 else if (funtype && prototype_p (funtype))
2905 for (t = TYPE_ARG_TYPES (funtype); t; t = TREE_CHAIN (t))
2906 cost += estimate_move_cost (TREE_VALUE (t));
2910 for (i = 0; i < gimple_call_num_args (stmt); i++)
2912 tree arg = gimple_call_arg (stmt, i);
2913 cost += estimate_move_cost (TREE_TYPE (arg));
2925 case GIMPLE_CHANGE_DYNAMIC_TYPE:
2926 case GIMPLE_PREDICT:
2934 return estimate_num_insns_seq (gimple_bind_body (stmt), weights);
2936 case GIMPLE_EH_FILTER:
2937 return estimate_num_insns_seq (gimple_eh_filter_failure (stmt), weights);
2940 return estimate_num_insns_seq (gimple_catch_handler (stmt), weights);
2943 return (estimate_num_insns_seq (gimple_try_eval (stmt), weights)
2944 + estimate_num_insns_seq (gimple_try_cleanup (stmt), weights));
2946 /* OpenMP directives are generally very expensive. */
2948 case GIMPLE_OMP_RETURN:
2949 case GIMPLE_OMP_SECTIONS_SWITCH:
2950 case GIMPLE_OMP_ATOMIC_STORE:
2951 case GIMPLE_OMP_CONTINUE:
2952 /* ...except these, which are cheap. */
2955 case GIMPLE_OMP_ATOMIC_LOAD:
2956 return weights->omp_cost;
2958 case GIMPLE_OMP_FOR:
2959 return (weights->omp_cost
2960 + estimate_num_insns_seq (gimple_omp_body (stmt), weights)
2961 + estimate_num_insns_seq (gimple_omp_for_pre_body (stmt), weights));
2963 case GIMPLE_OMP_PARALLEL:
2964 case GIMPLE_OMP_TASK:
2965 case GIMPLE_OMP_CRITICAL:
2966 case GIMPLE_OMP_MASTER:
2967 case GIMPLE_OMP_ORDERED:
2968 case GIMPLE_OMP_SECTION:
2969 case GIMPLE_OMP_SECTIONS:
2970 case GIMPLE_OMP_SINGLE:
2971 return (weights->omp_cost
2972 + estimate_num_insns_seq (gimple_omp_body (stmt), weights));
2981 /* Estimate number of instructions that will be created by expanding
2982 function FNDECL. WEIGHTS contains weights attributed to various
2986 estimate_num_insns_fn (tree fndecl, eni_weights *weights)
2988 struct function *my_function = DECL_STRUCT_FUNCTION (fndecl);
2989 gimple_stmt_iterator bsi;
2993 gcc_assert (my_function && my_function->cfg);
2994 FOR_EACH_BB_FN (bb, my_function)
2996 for (bsi = gsi_start_bb (bb); !gsi_end_p (bsi); gsi_next (&bsi))
2997 n += estimate_num_insns (gsi_stmt (bsi), weights);
3004 /* Initializes weights used by estimate_num_insns. */
3007 init_inline_once (void)
3009 eni_inlining_weights.call_cost = PARAM_VALUE (PARAM_INLINE_CALL_COST);
3010 eni_inlining_weights.target_builtin_call_cost = 1;
3011 eni_inlining_weights.div_mod_cost = 10;
3012 eni_inlining_weights.omp_cost = 40;
3014 eni_size_weights.call_cost = 1;
3015 eni_size_weights.target_builtin_call_cost = 1;
3016 eni_size_weights.div_mod_cost = 1;
3017 eni_size_weights.omp_cost = 40;
3019 /* Estimating time for call is difficult, since we have no idea what the
3020 called function does. In the current uses of eni_time_weights,
3021 underestimating the cost does less harm than overestimating it, so
3022 we choose a rather small value here. */
3023 eni_time_weights.call_cost = 10;
3024 eni_time_weights.target_builtin_call_cost = 10;
3025 eni_time_weights.div_mod_cost = 10;
3026 eni_time_weights.omp_cost = 40;
3029 /* Estimate the number of instructions in a gimple_seq. */
3032 count_insns_seq (gimple_seq seq, eni_weights *weights)
3034 gimple_stmt_iterator gsi;
3036 for (gsi = gsi_start (seq); !gsi_end_p (gsi); gsi_next (&gsi))
3037 n += estimate_num_insns (gsi_stmt (gsi), weights);
3043 /* Install new lexical TREE_BLOCK underneath 'current_block'. */
3046 prepend_lexical_block (tree current_block, tree new_block)
3048 BLOCK_CHAIN (new_block) = BLOCK_SUBBLOCKS (current_block);
3049 BLOCK_SUBBLOCKS (current_block) = new_block;
3050 BLOCK_SUPERCONTEXT (new_block) = current_block;
3053 /* Fetch callee declaration from the call graph edge going from NODE and
3054 associated with STMR call statement. Return NULL_TREE if not found. */
3056 get_indirect_callee_fndecl (struct cgraph_node *node, gimple stmt)
3058 struct cgraph_edge *cs;
3060 cs = cgraph_edge (node, stmt);
3062 return cs->callee->decl;
3067 /* If STMT is a GIMPLE_CALL, replace it with its inline expansion. */
3070 expand_call_inline (basic_block bb, gimple stmt, copy_body_data *id)
3072 tree retvar, use_retvar;
3074 struct pointer_map_t *st;
3077 location_t saved_location;
3078 struct cgraph_edge *cg_edge;
3080 basic_block return_block;
3082 gimple_stmt_iterator gsi, stmt_gsi;
3083 bool successfully_inlined = FALSE;
3084 bool purge_dead_abnormal_edges;
3088 /* Set input_location here so we get the right instantiation context
3089 if we call instantiate_decl from inlinable_function_p. */
3090 saved_location = input_location;
3091 if (gimple_has_location (stmt))
3092 input_location = gimple_location (stmt);
3094 /* From here on, we're only interested in CALL_EXPRs. */
3095 if (gimple_code (stmt) != GIMPLE_CALL)
3098 /* First, see if we can figure out what function is being called.
3099 If we cannot, then there is no hope of inlining the function. */
3100 fn = gimple_call_fndecl (stmt);
3103 fn = get_indirect_callee_fndecl (id->dst_node, stmt);
3108 /* Turn forward declarations into real ones. */
3109 fn = cgraph_node (fn)->decl;
3111 /* If FN is a declaration of a function in a nested scope that was
3112 globally declared inline, we don't set its DECL_INITIAL.
3113 However, we can't blindly follow DECL_ABSTRACT_ORIGIN because the
3114 C++ front-end uses it for cdtors to refer to their internal
3115 declarations, that are not real functions. Fortunately those
3116 don't have trees to be saved, so we can tell by checking their
3118 if (!DECL_INITIAL (fn)
3119 && DECL_ABSTRACT_ORIGIN (fn)
3120 && gimple_has_body_p (DECL_ABSTRACT_ORIGIN (fn)))
3121 fn = DECL_ABSTRACT_ORIGIN (fn);
3123 /* Objective C and fortran still calls tree_rest_of_compilation directly.
3124 Kill this check once this is fixed. */
3125 if (!id->dst_node->analyzed)
3128 cg_edge = cgraph_edge (id->dst_node, stmt);
3130 /* Constant propagation on argument done during previous inlining
3131 may create new direct call. Produce an edge for it. */
3134 struct cgraph_node *dest = cgraph_node (fn);
3136 /* We have missing edge in the callgraph. This can happen in one case
3137 where previous inlining turned indirect call into direct call by
3138 constant propagating arguments. In all other cases we hit a bug
3139 (incorrect node sharing is most common reason for missing edges. */
3140 gcc_assert (dest->needed);
3141 cgraph_create_edge (id->dst_node, dest, stmt,
3142 bb->count, CGRAPH_FREQ_BASE,
3143 bb->loop_depth)->inline_failed
3144 = N_("originally indirect function call not considered for inlining");
3147 fprintf (dump_file, "Created new direct edge to %s",
3148 cgraph_node_name (dest));
3153 /* Don't try to inline functions that are not well-suited to
3155 if (!cgraph_inline_p (cg_edge, &reason))
3157 /* If this call was originally indirect, we do not want to emit any
3158 inlining related warnings or sorry messages because there are no
3159 guarantees regarding those. */
3160 if (cg_edge->indirect_call)
3163 if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (fn))
3164 /* Avoid warnings during early inline pass. */
3165 && cgraph_global_info_ready)
3167 sorry ("inlining failed in call to %q+F: %s", fn, reason);
3168 sorry ("called from here");
3170 else if (warn_inline && DECL_DECLARED_INLINE_P (fn)
3171 && !DECL_IN_SYSTEM_HEADER (fn)
3173 && !lookup_attribute ("noinline", DECL_ATTRIBUTES (fn))
3174 /* Avoid warnings during early inline pass. */
3175 && cgraph_global_info_ready)
3177 warning (OPT_Winline, "inlining failed in call to %q+F: %s",
3179 warning (OPT_Winline, "called from here");
3183 fn = cg_edge->callee->decl;
3185 #ifdef ENABLE_CHECKING
3186 if (cg_edge->callee->decl != id->dst_node->decl)
3187 verify_cgraph_node (cg_edge->callee);
3190 /* We will be inlining this callee. */
3191 id->eh_region = lookup_stmt_eh_region (stmt);
3193 /* Split the block holding the GIMPLE_CALL. */
3194 e = split_block (bb, stmt);
3196 return_block = e->dest;
3199 /* split_block splits after the statement; work around this by
3200 moving the call into the second block manually. Not pretty,
3201 but seems easier than doing the CFG manipulation by hand
3202 when the GIMPLE_CALL is in the last statement of BB. */
3203 stmt_gsi = gsi_last_bb (bb);
3204 gsi_remove (&stmt_gsi, false);
3206 /* If the GIMPLE_CALL was in the last statement of BB, it may have
3207 been the source of abnormal edges. In this case, schedule
3208 the removal of dead abnormal edges. */
3209 gsi = gsi_start_bb (return_block);
3210 if (gsi_end_p (gsi))
3212 gsi_insert_after (&gsi, stmt, GSI_NEW_STMT);
3213 purge_dead_abnormal_edges = true;
3217 gsi_insert_before (&gsi, stmt, GSI_NEW_STMT);
3218 purge_dead_abnormal_edges = false;
3221 stmt_gsi = gsi_start_bb (return_block);
3223 /* Build a block containing code to initialize the arguments, the
3224 actual inline expansion of the body, and a label for the return
3225 statements within the function to jump to. The type of the
3226 statement expression is the return type of the function call. */
3227 id->block = make_node (BLOCK);
3228 BLOCK_ABSTRACT_ORIGIN (id->block) = fn;
3229 BLOCK_SOURCE_LOCATION (id->block) = input_location;
3230 prepend_lexical_block (gimple_block (stmt), id->block);
3232 /* Local declarations will be replaced by their equivalents in this
3235 id->decl_map = pointer_map_create ();
3237 /* Record the function we are about to inline. */
3239 id->src_node = cg_edge->callee;
3240 id->src_cfun = DECL_STRUCT_FUNCTION (fn);
3241 id->gimple_call = stmt;
3243 gcc_assert (!id->src_cfun->after_inlining);
3246 if (lookup_attribute ("cold", DECL_ATTRIBUTES (fn)))
3248 gimple_stmt_iterator si = gsi_last_bb (bb);
3249 gsi_insert_after (&si, gimple_build_predict (PRED_COLD_FUNCTION,
3253 initialize_inlined_parameters (id, stmt, fn, bb);
3255 if (DECL_INITIAL (fn))
3256 prepend_lexical_block (id->block, remap_blocks (DECL_INITIAL (fn), id));
3258 /* Return statements in the function body will be replaced by jumps
3259 to the RET_LABEL. */
3260 gcc_assert (DECL_INITIAL (fn));
3261 gcc_assert (TREE_CODE (DECL_INITIAL (fn)) == BLOCK);
3263 /* Find the LHS to which the result of this call is assigned. */
3265 if (gimple_call_lhs (stmt))
3267 modify_dest = gimple_call_lhs (stmt);
3269 /* The function which we are inlining might not return a value,
3270 in which case we should issue a warning that the function
3271 does not return a value. In that case the optimizers will
3272 see that the variable to which the value is assigned was not
3273 initialized. We do not want to issue a warning about that
3274 uninitialized variable. */
3275 if (DECL_P (modify_dest))
3276 TREE_NO_WARNING (modify_dest) = 1;
3278 if (gimple_call_return_slot_opt_p (stmt))
3280 return_slot = modify_dest;
3287 /* If we are inlining a call to the C++ operator new, we don't want
3288 to use type based alias analysis on the return value. Otherwise
3289 we may get confused if the compiler sees that the inlined new
3290 function returns a pointer which was just deleted. See bug
3292 if (DECL_IS_OPERATOR_NEW (fn))
3298 /* Declare the return variable for the function. */
3299 retvar = declare_return_variable (id, return_slot, modify_dest, &use_retvar);
3301 if (DECL_IS_OPERATOR_NEW (fn))
3303 gcc_assert (TREE_CODE (retvar) == VAR_DECL
3304 && POINTER_TYPE_P (TREE_TYPE (retvar)));
3305 DECL_NO_TBAA_P (retvar) = 1;
3308 /* This is it. Duplicate the callee body. Assume callee is
3309 pre-gimplified. Note that we must not alter the caller
3310 function in any way before this point, as this CALL_EXPR may be
3311 a self-referential call; if we're calling ourselves, we need to
3312 duplicate our body before altering anything. */
3313 copy_body (id, bb->count, bb->frequency, bb, return_block);
3315 /* Add local vars in this inlined callee to caller. */
3316 t_step = id->src_cfun->local_decls;
3317 for (; t_step; t_step = TREE_CHAIN (t_step))
3319 var = TREE_VALUE (t_step);
3320 if (TREE_STATIC (var) && !TREE_ASM_WRITTEN (var))
3321 cfun->local_decls = tree_cons (NULL_TREE, var,
3324 cfun->local_decls = tree_cons (NULL_TREE, remap_decl (var, id),
3329 pointer_map_destroy (id->decl_map);
3332 /* If the inlined function returns a result that we care about,
3333 substitute the GIMPLE_CALL with an assignment of the return
3334 variable to the LHS of the call. That is, if STMT was
3335 'a = foo (...)', substitute the call with 'a = USE_RETVAR'. */
3336 if (use_retvar && gimple_call_lhs (stmt))
3338 gimple old_stmt = stmt;
3339 stmt = gimple_build_assign (gimple_call_lhs (stmt), use_retvar);
3340 gsi_replace (&stmt_gsi, stmt, false);
3341 if (gimple_in_ssa_p (cfun))
3344 mark_symbols_for_renaming (stmt);
3346 maybe_clean_or_replace_eh_stmt (old_stmt, stmt);
3350 /* Handle the case of inlining a function with no return
3351 statement, which causes the return value to become undefined. */
3352 if (gimple_call_lhs (stmt)
3353 && TREE_CODE (gimple_call_lhs (stmt)) == SSA_NAME)
3355 tree name = gimple_call_lhs (stmt);
3356 tree var = SSA_NAME_VAR (name);
3357 tree def = gimple_default_def (cfun, var);
3361 /* If the variable is used undefined, make this name
3362 undefined via a move. */
3363 stmt = gimple_build_assign (gimple_call_lhs (stmt), def);
3364 gsi_replace (&stmt_gsi, stmt, true);
3369 /* Otherwise make this variable undefined. */
3370 gsi_remove (&stmt_gsi, true);
3371 set_default_def (var, name);
3372 SSA_NAME_DEF_STMT (name) = gimple_build_nop ();
3376 gsi_remove (&stmt_gsi, true);
3379 if (purge_dead_abnormal_edges)
3380 gimple_purge_dead_abnormal_call_edges (return_block);
3382 /* If the value of the new expression is ignored, that's OK. We
3383 don't warn about this for CALL_EXPRs, so we shouldn't warn about
3384 the equivalent inlined version either. */
3385 if (is_gimple_assign (stmt))
3387 gcc_assert (gimple_assign_single_p (stmt)
3388 || CONVERT_EXPR_CODE_P (gimple_assign_rhs_code (stmt)));
3389 TREE_USED (gimple_assign_rhs1 (stmt)) = 1;
3392 /* Output the inlining info for this abstract function, since it has been
3393 inlined. If we don't do this now, we can lose the information about the
3394 variables in the function when the blocks get blown away as soon as we
3395 remove the cgraph node. */
3396 (*debug_hooks->outlining_inline_function) (cg_edge->callee->decl);
3398 /* Update callgraph if needed. */
3399 cgraph_remove_node (cg_edge->callee);
3401 id->block = NULL_TREE;
3402 successfully_inlined = TRUE;
3405 input_location = saved_location;
3406 return successfully_inlined;
3409 /* Expand call statements reachable from STMT_P.
3410 We can only have CALL_EXPRs as the "toplevel" tree code or nested
3411 in a MODIFY_EXPR. See tree-gimple.c:get_call_expr_in(). We can
3412 unfortunately not use that function here because we need a pointer
3413 to the CALL_EXPR, not the tree itself. */
3416 gimple_expand_calls_inline (basic_block bb, copy_body_data *id)
3418 gimple_stmt_iterator gsi;
3420 for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
3422 gimple stmt = gsi_stmt (gsi);
3424 if (is_gimple_call (stmt)
3425 && expand_call_inline (bb, stmt, id))
3433 /* Walk all basic blocks created after FIRST and try to fold every statement
3434 in the STATEMENTS pointer set. */
3437 fold_marked_statements (int first, struct pointer_set_t *statements)
3439 for (; first < n_basic_blocks; first++)
3440 if (BASIC_BLOCK (first))
3442 gimple_stmt_iterator gsi;
3444 for (gsi = gsi_start_bb (BASIC_BLOCK (first));
3447 if (pointer_set_contains (statements, gsi_stmt (gsi)))
3449 gimple old_stmt = gsi_stmt (gsi);
3451 if (fold_stmt (&gsi))
3453 /* Re-read the statement from GSI as fold_stmt() may
3455 gimple new_stmt = gsi_stmt (gsi);
3456 update_stmt (new_stmt);
3458 if (is_gimple_call (old_stmt))
3459 cgraph_update_edges_for_call_stmt (old_stmt, new_stmt);
3461 if (maybe_clean_or_replace_eh_stmt (old_stmt, new_stmt))
3462 gimple_purge_dead_eh_edges (BASIC_BLOCK (first));
3468 /* Return true if BB has at least one abnormal outgoing edge. */
3471 has_abnormal_outgoing_edge_p (basic_block bb)
3476 FOR_EACH_EDGE (e, ei, bb->succs)
3477 if (e->flags & EDGE_ABNORMAL)
3483 /* Expand calls to inline functions in the body of FN. */
3486 optimize_inline_calls (tree fn)
3491 int last = n_basic_blocks;
3492 struct gimplify_ctx gctx;
3494 /* There is no point in performing inlining if errors have already
3495 occurred -- and we might crash if we try to inline invalid
3497 if (errorcount || sorrycount)
3501 memset (&id, 0, sizeof (id));
3503 id.src_node = id.dst_node = cgraph_node (fn);
3505 /* Or any functions that aren't finished yet. */
3506 prev_fn = NULL_TREE;
3507 if (current_function_decl)
3509 id.dst_fn = current_function_decl;
3510 prev_fn = current_function_decl;
3513 id.copy_decl = copy_decl_maybe_to_var;
3514 id.transform_call_graph_edges = CB_CGE_DUPLICATE;
3515 id.transform_new_cfg = false;
3516 id.transform_return_to_modify = true;
3517 id.transform_lang_insert_block = NULL;
3518 id.statements_to_fold = pointer_set_create ();
3520 push_gimplify_context (&gctx);
3522 /* We make no attempts to keep dominance info up-to-date. */
3523 free_dominance_info (CDI_DOMINATORS);
3524 free_dominance_info (CDI_POST_DOMINATORS);
3526 /* Register specific gimple functions. */
3527 gimple_register_cfg_hooks ();
3529 /* Reach the trees by walking over the CFG, and note the
3530 enclosing basic-blocks in the call edges. */
3531 /* We walk the blocks going forward, because inlined function bodies
3532 will split id->current_basic_block, and the new blocks will
3533 follow it; we'll trudge through them, processing their CALL_EXPRs
3536 gimple_expand_calls_inline (bb, &id);
3538 pop_gimplify_context (NULL);
3540 #ifdef ENABLE_CHECKING
3542 struct cgraph_edge *e;
3544 verify_cgraph_node (id.dst_node);
3546 /* Double check that we inlined everything we are supposed to inline. */
3547 for (e = id.dst_node->callees; e; e = e->next_callee)
3548 gcc_assert (e->inline_failed);
3552 /* Fold the statements before compacting/renumbering the basic blocks. */
3553 fold_marked_statements (last, id.statements_to_fold);
3554 pointer_set_destroy (id.statements_to_fold);
3556 /* Renumber the (code) basic_blocks consecutively. */
3558 /* Renumber the lexical scoping (non-code) blocks consecutively. */
3561 /* We are not going to maintain the cgraph edges up to date.
3562 Kill it so it won't confuse us. */
3563 cgraph_node_remove_callees (id.dst_node);
3565 fold_cond_expr_cond ();
3567 /* It would be nice to check SSA/CFG/statement consistency here, but it is
3568 not possible yet - the IPA passes might make various functions to not
3569 throw and they don't care to proactively update local EH info. This is
3570 done later in fixup_cfg pass that also execute the verification. */
3571 return (TODO_update_ssa
3573 | (gimple_in_ssa_p (cfun) ? TODO_remove_unused_locals : 0)
3574 | (profile_status != PROFILE_ABSENT ? TODO_rebuild_frequencies : 0));
3577 /* Passed to walk_tree. Copies the node pointed to, if appropriate. */
3580 copy_tree_r (tree *tp, int *walk_subtrees, void *data ATTRIBUTE_UNUSED)
3582 enum tree_code code = TREE_CODE (*tp);
3583 enum tree_code_class cl = TREE_CODE_CLASS (code);
3585 /* We make copies of most nodes. */
3586 if (IS_EXPR_CODE_CLASS (cl)
3587 || code == TREE_LIST
3589 || code == TYPE_DECL
3590 || code == OMP_CLAUSE)
3592 /* Because the chain gets clobbered when we make a copy, we save it
3594 tree chain = NULL_TREE, new_tree;
3596 chain = TREE_CHAIN (*tp);
3598 /* Copy the node. */
3599 new_tree = copy_node (*tp);
3601 /* Propagate mudflap marked-ness. */
3602 if (flag_mudflap && mf_marked_p (*tp))
3607 /* Now, restore the chain, if appropriate. That will cause
3608 walk_tree to walk into the chain as well. */
3609 if (code == PARM_DECL
3610 || code == TREE_LIST
3611 || code == OMP_CLAUSE)
3612 TREE_CHAIN (*tp) = chain;
3614 /* For now, we don't update BLOCKs when we make copies. So, we
3615 have to nullify all BIND_EXPRs. */
3616 if (TREE_CODE (*tp) == BIND_EXPR)
3617 BIND_EXPR_BLOCK (*tp) = NULL_TREE;
3619 else if (code == CONSTRUCTOR)
3621 /* CONSTRUCTOR nodes need special handling because
3622 we need to duplicate the vector of elements. */
3625 new_tree = copy_node (*tp);
3627 /* Propagate mudflap marked-ness. */
3628 if (flag_mudflap && mf_marked_p (*tp))
3631 CONSTRUCTOR_ELTS (new_tree) = VEC_copy (constructor_elt, gc,
3632 CONSTRUCTOR_ELTS (*tp));
3635 else if (TREE_CODE_CLASS (code) == tcc_type)
3637 else if (TREE_CODE_CLASS (code) == tcc_declaration)
3639 else if (TREE_CODE_CLASS (code) == tcc_constant)
3642 gcc_assert (code != STATEMENT_LIST);
3646 /* The SAVE_EXPR pointed to by TP is being copied. If ST contains
3647 information indicating to what new SAVE_EXPR this one should be mapped,
3648 use that one. Otherwise, create a new node and enter it in ST. FN is
3649 the function into which the copy will be placed. */
3652 remap_save_expr (tree *tp, void *st_, int *walk_subtrees)
3654 struct pointer_map_t *st = (struct pointer_map_t *) st_;
3658 /* See if we already encountered this SAVE_EXPR. */
3659 n = (tree *) pointer_map_contains (st, *tp);
3661 /* If we didn't already remap this SAVE_EXPR, do so now. */
3664 t = copy_node (*tp);
3666 /* Remember this SAVE_EXPR. */
3667 *pointer_map_insert (st, *tp) = t;
3668 /* Make sure we don't remap an already-remapped SAVE_EXPR. */
3669 *pointer_map_insert (st, t) = t;
3673 /* We've already walked into this SAVE_EXPR; don't do it again. */
3678 /* Replace this SAVE_EXPR with the copy. */
3682 /* Called via walk_tree. If *TP points to a DECL_STMT for a local label,
3683 copies the declaration and enters it in the splay_tree in DATA (which is
3684 really an `copy_body_data *'). */
3687 mark_local_for_remap_r (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
3690 copy_body_data *id = (copy_body_data *) data;
3692 /* Don't walk into types. */
3696 else if (TREE_CODE (*tp) == LABEL_EXPR)
3698 tree decl = TREE_OPERAND (*tp, 0);
3700 /* Copy the decl and remember the copy. */
3701 insert_decl_map (id, decl, id->copy_decl (decl, id));
3707 /* Perform any modifications to EXPR required when it is unsaved. Does
3708 not recurse into EXPR's subtrees. */
3711 unsave_expr_1 (tree expr)
3713 switch (TREE_CODE (expr))
3716 /* Don't mess with a TARGET_EXPR that hasn't been expanded.
3717 It's OK for this to happen if it was part of a subtree that
3718 isn't immediately expanded, such as operand 2 of another
3720 if (TREE_OPERAND (expr, 1))
3723 TREE_OPERAND (expr, 1) = TREE_OPERAND (expr, 3);
3724 TREE_OPERAND (expr, 3) = NULL_TREE;
3732 /* Called via walk_tree when an expression is unsaved. Using the
3733 splay_tree pointed to by ST (which is really a `splay_tree'),
3734 remaps all local declarations to appropriate replacements. */
3737 unsave_r (tree *tp, int *walk_subtrees, void *data)
3739 copy_body_data *id = (copy_body_data *) data;
3740 struct pointer_map_t *st = id->decl_map;
3743 /* Only a local declaration (variable or label). */
3744 if ((TREE_CODE (*tp) == VAR_DECL && !TREE_STATIC (*tp))
3745 || TREE_CODE (*tp) == LABEL_DECL)
3747 /* Lookup the declaration. */
3748 n = (tree *) pointer_map_contains (st, *tp);
3750 /* If it's there, remap it. */
3755 else if (TREE_CODE (*tp) == STATEMENT_LIST)
3757 else if (TREE_CODE (*tp) == BIND_EXPR)
3758 copy_bind_expr (tp, walk_subtrees, id);
3759 else if (TREE_CODE (*tp) == SAVE_EXPR)
3760 remap_save_expr (tp, st, walk_subtrees);
3763 copy_tree_r (tp, walk_subtrees, NULL);
3765 /* Do whatever unsaving is required. */
3766 unsave_expr_1 (*tp);
3769 /* Keep iterating. */
3773 /* Copies everything in EXPR and replaces variables, labels
3774 and SAVE_EXPRs local to EXPR. */
3777 unsave_expr_now (tree expr)
3781 /* There's nothing to do for NULL_TREE. */
3786 memset (&id, 0, sizeof (id));
3787 id.src_fn = current_function_decl;
3788 id.dst_fn = current_function_decl;
3789 id.decl_map = pointer_map_create ();
3791 id.copy_decl = copy_decl_no_change;
3792 id.transform_call_graph_edges = CB_CGE_DUPLICATE;
3793 id.transform_new_cfg = false;
3794 id.transform_return_to_modify = false;
3795 id.transform_lang_insert_block = NULL;
3797 /* Walk the tree once to find local labels. */
3798 walk_tree_without_duplicates (&expr, mark_local_for_remap_r, &id);
3800 /* Walk the tree again, copying, remapping, and unsaving. */
3801 walk_tree (&expr, unsave_r, &id, NULL);
3804 pointer_map_destroy (id.decl_map);
3809 /* Called via walk_gimple_seq. If *GSIP points to a GIMPLE_LABEL for a local
3810 label, copies the declaration and enters it in the splay_tree in DATA (which
3811 is really a 'copy_body_data *'. */
3814 mark_local_labels_stmt (gimple_stmt_iterator *gsip,
3815 bool *handled_ops_p ATTRIBUTE_UNUSED,
3816 struct walk_stmt_info *wi)
3818 copy_body_data *id = (copy_body_data *) wi->info;
3819 gimple stmt = gsi_stmt (*gsip);
3821 if (gimple_code (stmt) == GIMPLE_LABEL)
3823 tree decl = gimple_label_label (stmt);
3825 /* Copy the decl and remember the copy. */
3826 insert_decl_map (id, decl, id->copy_decl (decl, id));
3833 /* Called via walk_gimple_seq by copy_gimple_seq_and_replace_local.
3834 Using the splay_tree pointed to by ST (which is really a `splay_tree'),
3835 remaps all local declarations to appropriate replacements in gimple
3839 replace_locals_op (tree *tp, int *walk_subtrees, void *data)
3841 struct walk_stmt_info *wi = (struct walk_stmt_info*) data;
3842 copy_body_data *id = (copy_body_data *) wi->info;
3843 struct pointer_map_t *st = id->decl_map;
3847 /* Only a local declaration (variable or label). */
3848 if ((TREE_CODE (expr) == VAR_DECL
3849 && !TREE_STATIC (expr))
3850 || TREE_CODE (expr) == LABEL_DECL)
3852 /* Lookup the declaration. */
3853 n = (tree *) pointer_map_contains (st, expr);
3855 /* If it's there, remap it. */
3860 else if (TREE_CODE (expr) == STATEMENT_LIST
3861 || TREE_CODE (expr) == BIND_EXPR
3862 || TREE_CODE (expr) == SAVE_EXPR)
3864 else if (TREE_CODE (expr) == TARGET_EXPR)
3866 /* Don't mess with a TARGET_EXPR that hasn't been expanded.
3867 It's OK for this to happen if it was part of a subtree that
3868 isn't immediately expanded, such as operand 2 of another
3870 if (!TREE_OPERAND (expr, 1))
3872 TREE_OPERAND (expr, 1) = TREE_OPERAND (expr, 3);
3873 TREE_OPERAND (expr, 3) = NULL_TREE;
3877 /* Keep iterating. */
3882 /* Called via walk_gimple_seq by copy_gimple_seq_and_replace_local.
3883 Using the splay_tree pointed to by ST (which is really a `splay_tree'),
3884 remaps all local declarations to appropriate replacements in gimple
3888 replace_locals_stmt (gimple_stmt_iterator *gsip,
3889 bool *handled_ops_p ATTRIBUTE_UNUSED,
3890 struct walk_stmt_info *wi)
3892 copy_body_data *id = (copy_body_data *) wi->info;
3893 gimple stmt = gsi_stmt (*gsip);
3895 if (gimple_code (stmt) == GIMPLE_BIND)
3897 tree block = gimple_bind_block (stmt);
3901 remap_block (&block, id);
3902 gimple_bind_set_block (stmt, block);
3905 /* This will remap a lot of the same decls again, but this should be
3907 if (gimple_bind_vars (stmt))
3908 gimple_bind_set_vars (stmt, remap_decls (gimple_bind_vars (stmt), id));
3911 /* Keep iterating. */
3916 /* Copies everything in SEQ and replaces variables and labels local to
3917 current_function_decl. */
3920 copy_gimple_seq_and_replace_locals (gimple_seq seq)
3923 struct walk_stmt_info wi;
3924 struct pointer_set_t *visited;
3927 /* There's nothing to do for NULL_TREE. */
3932 memset (&id, 0, sizeof (id));
3933 id.src_fn = current_function_decl;
3934 id.dst_fn = current_function_decl;
3935 id.decl_map = pointer_map_create ();
3937 id.copy_decl = copy_decl_no_change;
3938 id.transform_call_graph_edges = CB_CGE_DUPLICATE;
3939 id.transform_new_cfg = false;
3940 id.transform_return_to_modify = false;
3941 id.transform_lang_insert_block = NULL;
3943 /* Walk the tree once to find local labels. */
3944 memset (&wi, 0, sizeof (wi));
3945 visited = pointer_set_create ();
3948 walk_gimple_seq (seq, mark_local_labels_stmt, NULL, &wi);
3949 pointer_set_destroy (visited);
3951 copy = gimple_seq_copy (seq);
3953 /* Walk the copy, remapping decls. */
3954 memset (&wi, 0, sizeof (wi));
3956 walk_gimple_seq (copy, replace_locals_stmt, replace_locals_op, &wi);
3959 pointer_map_destroy (id.decl_map);
3965 /* Allow someone to determine if SEARCH is a child of TOP from gdb. */
3968 debug_find_tree_1 (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED, void *data)
3977 debug_find_tree (tree top, tree search)
3979 return walk_tree_without_duplicates (&top, debug_find_tree_1, search) != 0;
3983 /* Declare the variables created by the inliner. Add all the variables in
3984 VARS to BIND_EXPR. */
3987 declare_inline_vars (tree block, tree vars)
3990 for (t = vars; t; t = TREE_CHAIN (t))
3992 DECL_SEEN_IN_BIND_EXPR_P (t) = 1;
3993 gcc_assert (!TREE_STATIC (t) && !TREE_ASM_WRITTEN (t));
3994 cfun->local_decls = tree_cons (NULL_TREE, t, cfun->local_decls);
3998 BLOCK_VARS (block) = chainon (BLOCK_VARS (block), vars);
4001 /* Copy NODE (which must be a DECL). The DECL originally was in the FROM_FN,
4002 but now it will be in the TO_FN. PARM_TO_VAR means enable PARM_DECL to
4003 VAR_DECL translation. */
4006 copy_decl_for_dup_finish (copy_body_data *id, tree decl, tree copy)
4008 /* Don't generate debug information for the copy if we wouldn't have
4009 generated it for the copy either. */
4010 DECL_ARTIFICIAL (copy) = DECL_ARTIFICIAL (decl);
4011 DECL_IGNORED_P (copy) = DECL_IGNORED_P (decl);
4013 /* Set the DECL_ABSTRACT_ORIGIN so the debugging routines know what
4014 declaration inspired this copy. */
4015 DECL_ABSTRACT_ORIGIN (copy) = DECL_ORIGIN (decl);
4017 /* The new variable/label has no RTL, yet. */
4018 if (CODE_CONTAINS_STRUCT (TREE_CODE (copy), TS_DECL_WRTL)
4019 && !TREE_STATIC (copy) && !DECL_EXTERNAL (copy))
4020 SET_DECL_RTL (copy, NULL_RTX);
4022 /* These args would always appear unused, if not for this. */
4023 TREE_USED (copy) = 1;
4025 /* Set the context for the new declaration. */
4026 if (!DECL_CONTEXT (decl))
4027 /* Globals stay global. */
4029 else if (DECL_CONTEXT (decl) != id->src_fn)
4030 /* Things that weren't in the scope of the function we're inlining
4031 from aren't in the scope we're inlining to, either. */
4033 else if (TREE_STATIC (decl))
4034 /* Function-scoped static variables should stay in the original
4038 /* Ordinary automatic local variables are now in the scope of the
4040 DECL_CONTEXT (copy) = id->dst_fn;
4046 copy_decl_to_var (tree decl, copy_body_data *id)
4050 gcc_assert (TREE_CODE (decl) == PARM_DECL
4051 || TREE_CODE (decl) == RESULT_DECL);
4053 type = TREE_TYPE (decl);
4055 copy = build_decl (VAR_DECL, DECL_NAME (decl), type);
4056 TREE_ADDRESSABLE (copy) = TREE_ADDRESSABLE (decl);
4057 TREE_READONLY (copy) = TREE_READONLY (decl);
4058 TREE_THIS_VOLATILE (copy) = TREE_THIS_VOLATILE (decl);
4059 DECL_GIMPLE_REG_P (copy) = DECL_GIMPLE_REG_P (decl);
4060 DECL_NO_TBAA_P (copy) = DECL_NO_TBAA_P (decl);
4062 return copy_decl_for_dup_finish (id, decl, copy);
4065 /* Like copy_decl_to_var, but create a return slot object instead of a
4066 pointer variable for return by invisible reference. */
4069 copy_result_decl_to_var (tree decl, copy_body_data *id)
4073 gcc_assert (TREE_CODE (decl) == PARM_DECL
4074 || TREE_CODE (decl) == RESULT_DECL);
4076 type = TREE_TYPE (decl);
4077 if (DECL_BY_REFERENCE (decl))
4078 type = TREE_TYPE (type);
4080 copy = build_decl (VAR_DECL, DECL_NAME (decl), type);
4081 TREE_READONLY (copy) = TREE_READONLY (decl);
4082 TREE_THIS_VOLATILE (copy) = TREE_THIS_VOLATILE (decl);
4083 if (!DECL_BY_REFERENCE (decl))
4085 TREE_ADDRESSABLE (copy) = TREE_ADDRESSABLE (decl);
4086 DECL_GIMPLE_REG_P (copy) = DECL_GIMPLE_REG_P (decl);
4087 DECL_NO_TBAA_P (copy) = DECL_NO_TBAA_P (decl);
4090 return copy_decl_for_dup_finish (id, decl, copy);
4094 copy_decl_no_change (tree decl, copy_body_data *id)
4098 copy = copy_node (decl);
4100 /* The COPY is not abstract; it will be generated in DST_FN. */
4101 DECL_ABSTRACT (copy) = 0;
4102 lang_hooks.dup_lang_specific_decl (copy);
4104 /* TREE_ADDRESSABLE isn't used to indicate that a label's address has
4105 been taken; it's for internal bookkeeping in expand_goto_internal. */
4106 if (TREE_CODE (copy) == LABEL_DECL)
4108 TREE_ADDRESSABLE (copy) = 0;
4109 LABEL_DECL_UID (copy) = -1;
4112 return copy_decl_for_dup_finish (id, decl, copy);
4116 copy_decl_maybe_to_var (tree decl, copy_body_data *id)
4118 if (TREE_CODE (decl) == PARM_DECL || TREE_CODE (decl) == RESULT_DECL)
4119 return copy_decl_to_var (decl, id);
4121 return copy_decl_no_change (decl, id);
4124 /* Return a copy of the function's argument tree. */
4126 copy_arguments_for_versioning (tree orig_parm, copy_body_data * id,
4127 bitmap args_to_skip, tree *vars)
4130 tree new_parm = NULL;
4135 for (arg = orig_parm; arg; arg = TREE_CHAIN (arg), i++)
4136 if (!args_to_skip || !bitmap_bit_p (args_to_skip, i))
4138 tree new_tree = remap_decl (arg, id);
4139 lang_hooks.dup_lang_specific_decl (new_tree);
4141 parg = &TREE_CHAIN (new_tree);
4145 /* Make an equivalent VAR_DECL. If the argument was used
4146 as temporary variable later in function, the uses will be
4147 replaced by local variable. */
4148 tree var = copy_decl_to_var (arg, id);
4150 add_referenced_var (var);
4151 insert_decl_map (id, arg, var);
4152 /* Declare this new variable. */
4153 TREE_CHAIN (var) = *vars;
4159 /* Return a copy of the function's static chain. */
4161 copy_static_chain (tree static_chain, copy_body_data * id)
4163 tree *chain_copy, *pvar;
4165 chain_copy = &static_chain;
4166 for (pvar = chain_copy; *pvar; pvar = &TREE_CHAIN (*pvar))
4168 tree new_tree = remap_decl (*pvar, id);
4169 lang_hooks.dup_lang_specific_decl (new_tree);
4170 TREE_CHAIN (new_tree) = TREE_CHAIN (*pvar);
4173 return static_chain;
4176 /* Return true if the function is allowed to be versioned.
4177 This is a guard for the versioning functionality. */
4179 tree_versionable_function_p (tree fndecl)
4181 if (fndecl == NULL_TREE)
4183 /* ??? There are cases where a function is
4184 uninlinable but can be versioned. */
4185 if (!tree_inlinable_function_p (fndecl))
4191 /* Create a copy of a function's tree.
4192 OLD_DECL and NEW_DECL are FUNCTION_DECL tree nodes
4193 of the original function and the new copied function
4194 respectively. In case we want to replace a DECL
4195 tree with another tree while duplicating the function's
4196 body, TREE_MAP represents the mapping between these
4197 trees. If UPDATE_CLONES is set, the call_stmt fields
4198 of edges of clones of the function will be updated. */
4200 tree_function_versioning (tree old_decl, tree new_decl, varray_type tree_map,
4201 bool update_clones, bitmap args_to_skip)
4203 struct cgraph_node *old_version_node;
4204 struct cgraph_node *new_version_node;
4208 struct ipa_replace_map *replace_info;
4209 basic_block old_entry_block;
4210 VEC (gimple, heap) *init_stmts = VEC_alloc (gimple, heap, 10);
4213 tree old_current_function_decl = current_function_decl;
4214 tree vars = NULL_TREE;
4216 gcc_assert (TREE_CODE (old_decl) == FUNCTION_DECL
4217 && TREE_CODE (new_decl) == FUNCTION_DECL);
4218 DECL_POSSIBLY_INLINED (old_decl) = 1;
4220 old_version_node = cgraph_node (old_decl);
4221 new_version_node = cgraph_node (new_decl);
4223 DECL_ARTIFICIAL (new_decl) = 1;
4224 DECL_ABSTRACT_ORIGIN (new_decl) = DECL_ORIGIN (old_decl);
4226 /* Prepare the data structures for the tree copy. */
4227 memset (&id, 0, sizeof (id));
4229 /* Generate a new name for the new version. */
4232 DECL_NAME (new_decl) = create_tmp_var_name (NULL);
4233 SET_DECL_ASSEMBLER_NAME (new_decl, DECL_NAME (new_decl));
4234 SET_DECL_RTL (new_decl, NULL_RTX);
4235 id.statements_to_fold = pointer_set_create ();
4238 id.decl_map = pointer_map_create ();
4239 id.src_fn = old_decl;
4240 id.dst_fn = new_decl;
4241 id.src_node = old_version_node;
4242 id.dst_node = new_version_node;
4243 id.src_cfun = DECL_STRUCT_FUNCTION (old_decl);
4245 id.copy_decl = copy_decl_no_change;
4246 id.transform_call_graph_edges
4247 = update_clones ? CB_CGE_MOVE_CLONES : CB_CGE_MOVE;
4248 id.transform_new_cfg = true;
4249 id.transform_return_to_modify = false;
4250 id.transform_lang_insert_block = NULL;
4252 current_function_decl = new_decl;
4253 old_entry_block = ENTRY_BLOCK_PTR_FOR_FUNCTION
4254 (DECL_STRUCT_FUNCTION (old_decl));
4255 initialize_cfun (new_decl, old_decl,
4256 old_entry_block->count,
4257 old_entry_block->frequency);
4258 push_cfun (DECL_STRUCT_FUNCTION (new_decl));
4260 /* Copy the function's static chain. */
4261 p = DECL_STRUCT_FUNCTION (old_decl)->static_chain_decl;
4263 DECL_STRUCT_FUNCTION (new_decl)->static_chain_decl =
4264 copy_static_chain (DECL_STRUCT_FUNCTION (old_decl)->static_chain_decl,
4266 /* Copy the function's arguments. */
4267 if (DECL_ARGUMENTS (old_decl) != NULL_TREE)
4268 DECL_ARGUMENTS (new_decl) =
4269 copy_arguments_for_versioning (DECL_ARGUMENTS (old_decl), &id,
4270 args_to_skip, &vars);
4272 DECL_INITIAL (new_decl) = remap_blocks (DECL_INITIAL (id.src_fn), &id);
4274 /* Renumber the lexical scoping (non-code) blocks consecutively. */
4275 number_blocks (id.dst_fn);
4277 /* If there's a tree_map, prepare for substitution. */
4279 for (i = 0; i < VARRAY_ACTIVE_SIZE (tree_map); i++)
4283 = (struct ipa_replace_map *) VARRAY_GENERIC_PTR (tree_map, i);
4284 if (replace_info->replace_p)
4286 tree op = replace_info->new_tree;
4290 if (TREE_CODE (op) == VIEW_CONVERT_EXPR)
4291 op = TREE_OPERAND (op, 0);
4293 if (TREE_CODE (op) == ADDR_EXPR)
4295 op = TREE_OPERAND (op, 0);
4296 while (handled_component_p (op))
4297 op = TREE_OPERAND (op, 0);
4298 if (TREE_CODE (op) == VAR_DECL)
4299 add_referenced_var (op);
4301 gcc_assert (TREE_CODE (replace_info->old_tree) == PARM_DECL);
4302 init = setup_one_parameter (&id, replace_info->old_tree,
4303 replace_info->new_tree, id.src_fn,
4307 VEC_safe_push (gimple, heap, init_stmts, init);
4311 declare_inline_vars (DECL_INITIAL (new_decl), vars);
4312 if (DECL_STRUCT_FUNCTION (old_decl)->local_decls != NULL_TREE)
4313 /* Add local vars. */
4314 for (t_step = DECL_STRUCT_FUNCTION (old_decl)->local_decls;
4315 t_step; t_step = TREE_CHAIN (t_step))
4317 tree var = TREE_VALUE (t_step);
4318 if (TREE_STATIC (var) && !TREE_ASM_WRITTEN (var))
4319 cfun->local_decls = tree_cons (NULL_TREE, var, cfun->local_decls);
4322 tree_cons (NULL_TREE, remap_decl (var, &id),
4326 /* Copy the Function's body. */
4327 copy_body (&id, old_entry_block->count, old_entry_block->frequency, ENTRY_BLOCK_PTR, EXIT_BLOCK_PTR);
4329 if (DECL_RESULT (old_decl) != NULL_TREE)
4331 tree *res_decl = &DECL_RESULT (old_decl);
4332 DECL_RESULT (new_decl) = remap_decl (*res_decl, &id);
4333 lang_hooks.dup_lang_specific_decl (DECL_RESULT (new_decl));
4336 /* Renumber the lexical scoping (non-code) blocks consecutively. */
4337 number_blocks (new_decl);
4339 if (VEC_length (gimple, init_stmts))
4341 basic_block bb = split_edge (single_succ_edge (ENTRY_BLOCK_PTR));
4342 while (VEC_length (gimple, init_stmts))
4343 insert_init_stmt (bb, VEC_pop (gimple, init_stmts));
4347 pointer_map_destroy (id.decl_map);
4350 fold_marked_statements (0, id.statements_to_fold);
4351 pointer_set_destroy (id.statements_to_fold);
4352 fold_cond_expr_cond ();
4354 if (gimple_in_ssa_p (cfun))
4356 free_dominance_info (CDI_DOMINATORS);
4357 free_dominance_info (CDI_POST_DOMINATORS);
4359 delete_unreachable_blocks ();
4360 update_ssa (TODO_update_ssa);
4363 fold_cond_expr_cond ();
4364 if (need_ssa_update_p ())
4365 update_ssa (TODO_update_ssa);
4368 free_dominance_info (CDI_DOMINATORS);
4369 free_dominance_info (CDI_POST_DOMINATORS);
4370 VEC_free (gimple, heap, init_stmts);
4372 current_function_decl = old_current_function_decl;
4373 gcc_assert (!current_function_decl
4374 || DECL_STRUCT_FUNCTION (current_function_decl) == cfun);
4378 /* Duplicate a type, fields and all. */
4381 build_duplicate_type (tree type)
4383 struct copy_body_data id;
4385 memset (&id, 0, sizeof (id));
4386 id.src_fn = current_function_decl;
4387 id.dst_fn = current_function_decl;
4389 id.decl_map = pointer_map_create ();
4390 id.copy_decl = copy_decl_no_change;
4392 type = remap_type_1 (type, &id);
4394 pointer_map_destroy (id.decl_map);
4396 TYPE_CANONICAL (type) = type;
4401 /* Return whether it is safe to inline a function because it used different
4402 target specific options or different optimization options. */
4404 tree_can_inline_p (tree caller, tree callee)
4407 /* This causes a regression in SPEC in that it prevents a cold function from
4408 inlining a hot function. Perhaps this should only apply to functions
4409 that the user declares hot/cold/optimize explicitly. */
4411 /* Don't inline a function with a higher optimization level than the
4412 caller, or with different space constraints (hot/cold functions). */
4413 tree caller_tree = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (caller);
4414 tree callee_tree = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (callee);
4416 if (caller_tree != callee_tree)
4418 struct cl_optimization *caller_opt
4419 = TREE_OPTIMIZATION ((caller_tree)
4421 : optimization_default_node);
4423 struct cl_optimization *callee_opt
4424 = TREE_OPTIMIZATION ((callee_tree)
4426 : optimization_default_node);
4428 if ((caller_opt->optimize > callee_opt->optimize)
4429 || (caller_opt->optimize_size != callee_opt->optimize_size))
4434 /* Allow the backend to decide if inlining is ok. */
4435 return targetm.target_option.can_inline_p (caller, callee);