2 Copyright 2001, 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
3 Contributed by Alexandre Oliva <aoliva@redhat.com>
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GCC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to
19 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
20 Boston, MA 02110-1301, USA. */
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"
53 /* I'm not real happy about this, but we need to handle gimple and
55 #include "tree-gimple.h"
57 /* Inlining, Cloning, Versioning, Parallelization
59 Inlining: a function body is duplicated, but the PARM_DECLs are
60 remapped into VAR_DECLs, and non-void RETURN_EXPRs become
61 MODIFY_EXPRs that store to a dedicated returned-value variable.
62 The duplicated eh_region info of the copy will later be appended
63 to the info for the caller; the eh_region info in copied throwing
64 statements and RESX_EXPRs is adjusted accordingly.
66 Cloning: (only in C++) We have one body for a con/de/structor, and
67 multiple function decls, each with a unique parameter list.
68 Duplicate the body, using the given splay tree; some parameters
69 will become constants (like 0 or 1).
71 Versioning: a function body is duplicated and the result is a new
72 function rather than into blocks of an existing function as with
73 inlining. Some parameters will become constants.
75 Parallelization: a region of a function is duplicated resulting in
76 a new function. Variables may be replaced with complex expressions
77 to enable shared variable semantics.
79 All of these will simultaneously lookup any callgraph edges. If
80 we're going to inline the duplicated function body, and the given
81 function has some cloned callgraph nodes (one for each place this
82 function will be inlined) those callgraph edges will be duplicated.
83 If we're cloning the body, those callgraph edges will be
84 updated to point into the new body. (Note that the original
85 callgraph node and edge list will not be altered.)
87 See the CALL_EXPR handling case in copy_body_r (). */
89 /* 0 if we should not perform inlining.
90 1 if we should expand functions calls inline at the tree level.
91 2 if we should consider *all* functions to be inline
94 int flag_inline_trees = 0;
98 o In order to make inlining-on-trees work, we pessimized
99 function-local static constants. In particular, they are now
100 always output, even when not addressed. Fix this by treating
101 function-local static constants just like global static
102 constants; the back-end already knows not to output them if they
105 o Provide heuristics to clamp inlining of recursive template
110 static tree declare_return_variable (copy_body_data *, tree, tree, tree *);
111 static tree copy_generic_body (copy_body_data *);
112 static bool inlinable_function_p (tree);
113 static void remap_block (tree *, copy_body_data *);
114 static tree remap_decls (tree, copy_body_data *);
115 static void copy_bind_expr (tree *, int *, copy_body_data *);
116 static tree mark_local_for_remap_r (tree *, int *, void *);
117 static void unsave_expr_1 (tree);
118 static tree unsave_r (tree *, int *, void *);
119 static void declare_inline_vars (tree, tree);
120 static void remap_save_expr (tree *, void *, int *);
121 static void add_lexical_block (tree current_block, tree new_block);
122 static tree copy_decl_to_var (tree, copy_body_data *);
123 static tree copy_result_decl_to_var (tree, copy_body_data *);
124 static tree copy_decl_no_change (tree, copy_body_data *);
125 static tree copy_decl_maybe_to_var (tree, copy_body_data *);
127 /* Insert a tree->tree mapping for ID. Despite the name suggests
128 that the trees should be variables, it is used for more than that. */
131 insert_decl_map (copy_body_data *id, tree key, tree value)
133 splay_tree_insert (id->decl_map, (splay_tree_key) key,
134 (splay_tree_value) value);
136 /* Always insert an identity map as well. If we see this same new
137 node again, we won't want to duplicate it a second time. */
139 splay_tree_insert (id->decl_map, (splay_tree_key) value,
140 (splay_tree_value) value);
143 /* Remap DECL during the copying of the BLOCK tree for the function. */
146 remap_decl (tree decl, copy_body_data *id)
151 /* We only remap local variables in the current function. */
154 /* See if we have remapped this declaration. */
156 n = splay_tree_lookup (id->decl_map, (splay_tree_key) decl);
158 /* If we didn't already have an equivalent for this declaration,
162 /* Make a copy of the variable or label. */
163 tree t = id->copy_decl (decl, id);
165 /* Remember it, so that if we encounter this local entity again
166 we can reuse this copy. Do this early because remap_type may
167 need this decl for TYPE_STUB_DECL. */
168 insert_decl_map (id, decl, t);
173 /* Remap types, if necessary. */
174 TREE_TYPE (t) = remap_type (TREE_TYPE (t), id);
175 if (TREE_CODE (t) == TYPE_DECL)
176 DECL_ORIGINAL_TYPE (t) = remap_type (DECL_ORIGINAL_TYPE (t), id);
178 /* Remap sizes as necessary. */
179 walk_tree (&DECL_SIZE (t), copy_body_r, id, NULL);
180 walk_tree (&DECL_SIZE_UNIT (t), copy_body_r, id, NULL);
182 /* If fields, do likewise for offset and qualifier. */
183 if (TREE_CODE (t) == FIELD_DECL)
185 walk_tree (&DECL_FIELD_OFFSET (t), copy_body_r, id, NULL);
186 if (TREE_CODE (DECL_CONTEXT (t)) == QUAL_UNION_TYPE)
187 walk_tree (&DECL_QUALIFIER (t), copy_body_r, id, NULL);
193 return unshare_expr ((tree) n->value);
197 remap_type_1 (tree type, copy_body_data *id)
199 splay_tree_node node;
205 /* See if we have remapped this type. */
206 node = splay_tree_lookup (id->decl_map, (splay_tree_key) type);
208 return (tree) node->value;
210 /* The type only needs remapping if it's variably modified. */
211 if (! variably_modified_type_p (type, id->src_fn))
213 insert_decl_map (id, type, type);
217 /* We do need a copy. build and register it now. If this is a pointer or
218 reference type, remap the designated type and make a new pointer or
220 if (TREE_CODE (type) == POINTER_TYPE)
222 new = build_pointer_type_for_mode (remap_type (TREE_TYPE (type), id),
224 TYPE_REF_CAN_ALIAS_ALL (type));
225 insert_decl_map (id, type, new);
228 else if (TREE_CODE (type) == REFERENCE_TYPE)
230 new = build_reference_type_for_mode (remap_type (TREE_TYPE (type), id),
232 TYPE_REF_CAN_ALIAS_ALL (type));
233 insert_decl_map (id, type, new);
237 new = copy_node (type);
239 insert_decl_map (id, type, new);
241 /* This is a new type, not a copy of an old type. Need to reassociate
242 variants. We can handle everything except the main variant lazily. */
243 t = TYPE_MAIN_VARIANT (type);
246 t = remap_type (t, id);
247 TYPE_MAIN_VARIANT (new) = t;
248 TYPE_NEXT_VARIANT (new) = TYPE_MAIN_VARIANT (t);
249 TYPE_NEXT_VARIANT (t) = new;
253 TYPE_MAIN_VARIANT (new) = new;
254 TYPE_NEXT_VARIANT (new) = NULL;
257 if (TYPE_STUB_DECL (type))
258 TYPE_STUB_DECL (new) = remap_decl (TYPE_STUB_DECL (type), id);
260 /* Lazily create pointer and reference types. */
261 TYPE_POINTER_TO (new) = NULL;
262 TYPE_REFERENCE_TO (new) = NULL;
264 switch (TREE_CODE (new))
270 t = TYPE_MIN_VALUE (new);
271 if (t && TREE_CODE (t) != INTEGER_CST)
272 walk_tree (&TYPE_MIN_VALUE (new), copy_body_r, id, NULL);
274 t = TYPE_MAX_VALUE (new);
275 if (t && TREE_CODE (t) != INTEGER_CST)
276 walk_tree (&TYPE_MAX_VALUE (new), copy_body_r, id, NULL);
280 TREE_TYPE (new) = remap_type (TREE_TYPE (new), id);
281 walk_tree (&TYPE_ARG_TYPES (new), copy_body_r, id, NULL);
285 TREE_TYPE (new) = remap_type (TREE_TYPE (new), id);
286 TYPE_DOMAIN (new) = remap_type (TYPE_DOMAIN (new), id);
291 case QUAL_UNION_TYPE:
295 for (f = TYPE_FIELDS (new); f ; f = TREE_CHAIN (f))
297 t = remap_decl (f, id);
298 DECL_CONTEXT (t) = new;
302 TYPE_FIELDS (new) = nreverse (nf);
308 /* Shouldn't have been thought variable sized. */
312 walk_tree (&TYPE_SIZE (new), copy_body_r, id, NULL);
313 walk_tree (&TYPE_SIZE_UNIT (new), copy_body_r, id, NULL);
319 remap_type (tree type, copy_body_data *id)
321 splay_tree_node node;
326 /* See if we have remapped this type. */
327 node = splay_tree_lookup (id->decl_map, (splay_tree_key) type);
329 return (tree) node->value;
331 /* The type only needs remapping if it's variably modified. */
332 if (! variably_modified_type_p (type, id->src_fn))
334 insert_decl_map (id, type, type);
338 return remap_type_1 (type, id);
342 remap_decls (tree decls, copy_body_data *id)
345 tree new_decls = NULL_TREE;
347 /* Remap its variables. */
348 for (old_var = decls; old_var; old_var = TREE_CHAIN (old_var))
352 /* We can not chain the local static declarations into the unexpanded_var_list
353 as we can't duplicate them or break one decl rule. Go ahead and link
354 them into unexpanded_var_list. */
355 if (!lang_hooks.tree_inlining.auto_var_in_fn_p (old_var, id->src_fn)
356 && !DECL_EXTERNAL (old_var))
358 cfun->unexpanded_var_list = tree_cons (NULL_TREE, old_var,
359 cfun->unexpanded_var_list);
363 /* Remap the variable. */
364 new_var = remap_decl (old_var, id);
366 /* If we didn't remap this variable, so we can't mess with its
367 TREE_CHAIN. If we remapped this variable to the return slot, it's
368 already declared somewhere else, so don't declare it here. */
369 if (!new_var || new_var == id->retvar)
373 gcc_assert (DECL_P (new_var));
374 TREE_CHAIN (new_var) = new_decls;
379 return nreverse (new_decls);
382 /* Copy the BLOCK to contain remapped versions of the variables
383 therein. And hook the new block into the block-tree. */
386 remap_block (tree *block, copy_body_data *id)
392 /* Make the new block. */
394 new_block = make_node (BLOCK);
395 TREE_USED (new_block) = TREE_USED (old_block);
396 BLOCK_ABSTRACT_ORIGIN (new_block) = old_block;
397 BLOCK_SOURCE_LOCATION (new_block) = BLOCK_SOURCE_LOCATION (old_block);
400 /* Remap its variables. */
401 BLOCK_VARS (new_block) = remap_decls (BLOCK_VARS (old_block), id);
405 if (id->transform_lang_insert_block)
406 lang_hooks.decls.insert_block (new_block);
408 /* Remember the remapped block. */
409 insert_decl_map (id, old_block, new_block);
412 /* Copy the whole block tree and root it in id->block. */
414 remap_blocks (tree block, copy_body_data *id)
422 remap_block (&new, id);
423 gcc_assert (new != block);
424 for (t = BLOCK_SUBBLOCKS (block); t ; t = BLOCK_CHAIN (t))
425 add_lexical_block (new, remap_blocks (t, id));
430 copy_statement_list (tree *tp)
432 tree_stmt_iterator oi, ni;
435 new = alloc_stmt_list ();
436 ni = tsi_start (new);
437 oi = tsi_start (*tp);
440 for (; !tsi_end_p (oi); tsi_next (&oi))
441 tsi_link_after (&ni, tsi_stmt (oi), TSI_NEW_STMT);
445 copy_bind_expr (tree *tp, int *walk_subtrees, copy_body_data *id)
447 tree block = BIND_EXPR_BLOCK (*tp);
448 /* Copy (and replace) the statement. */
449 copy_tree_r (tp, walk_subtrees, NULL);
452 remap_block (&block, id);
453 BIND_EXPR_BLOCK (*tp) = block;
456 if (BIND_EXPR_VARS (*tp))
457 /* This will remap a lot of the same decls again, but this should be
459 BIND_EXPR_VARS (*tp) = remap_decls (BIND_EXPR_VARS (*tp), id);
462 /* Called from copy_body_id via walk_tree. DATA is really an
463 `copy_body_data *'. */
466 copy_body_r (tree *tp, int *walk_subtrees, void *data)
468 copy_body_data *id = (copy_body_data *) data;
469 tree fn = id->src_fn;
472 /* Begin by recognizing trees that we'll completely rewrite for the
473 inlining context. Our output for these trees is completely
474 different from out input (e.g. RETURN_EXPR is deleted, and morphs
475 into an edge). Further down, we'll handle trees that get
476 duplicated and/or tweaked. */
478 /* When requested, RETURN_EXPRs should be transformed to just the
479 contained MODIFY_EXPR. The branch semantics of the return will
480 be handled elsewhere by manipulating the CFG rather than a statement. */
481 if (TREE_CODE (*tp) == RETURN_EXPR && id->transform_return_to_modify)
483 tree assignment = TREE_OPERAND (*tp, 0);
485 /* If we're returning something, just turn that into an
486 assignment into the equivalent of the original RESULT_DECL.
487 If the "assignment" is just the result decl, the result
488 decl has already been set (e.g. a recent "foo (&result_decl,
489 ...)"); just toss the entire RETURN_EXPR. */
490 if (assignment && TREE_CODE (assignment) == MODIFY_EXPR)
492 /* Replace the RETURN_EXPR with (a copy of) the
493 MODIFY_EXPR hanging underneath. */
494 *tp = copy_node (assignment);
496 else /* Else the RETURN_EXPR returns no value. */
499 return (tree) (void *)1;
503 /* Local variables and labels need to be replaced by equivalent
504 variables. We don't want to copy static variables; there's only
505 one of those, no matter how many times we inline the containing
506 function. Similarly for globals from an outer function. */
507 else if (lang_hooks.tree_inlining.auto_var_in_fn_p (*tp, fn))
511 /* Remap the declaration. */
512 new_decl = remap_decl (*tp, id);
513 gcc_assert (new_decl);
514 /* Replace this variable with the copy. */
515 STRIP_TYPE_NOPS (new_decl);
519 else if (TREE_CODE (*tp) == STATEMENT_LIST)
520 copy_statement_list (tp);
521 else if (TREE_CODE (*tp) == SAVE_EXPR)
522 remap_save_expr (tp, id->decl_map, walk_subtrees);
523 else if (TREE_CODE (*tp) == LABEL_DECL
524 && (! DECL_CONTEXT (*tp)
525 || decl_function_context (*tp) == id->src_fn))
526 /* These may need to be remapped for EH handling. */
527 *tp = remap_decl (*tp, id);
528 else if (TREE_CODE (*tp) == BIND_EXPR)
529 copy_bind_expr (tp, walk_subtrees, id);
530 /* Types may need remapping as well. */
531 else if (TYPE_P (*tp))
532 *tp = remap_type (*tp, id);
534 /* If this is a constant, we have to copy the node iff the type will be
535 remapped. copy_tree_r will not copy a constant. */
536 else if (CONSTANT_CLASS_P (*tp))
538 tree new_type = remap_type (TREE_TYPE (*tp), id);
540 if (new_type == TREE_TYPE (*tp))
543 else if (TREE_CODE (*tp) == INTEGER_CST)
544 *tp = build_int_cst_wide (new_type, TREE_INT_CST_LOW (*tp),
545 TREE_INT_CST_HIGH (*tp));
548 *tp = copy_node (*tp);
549 TREE_TYPE (*tp) = new_type;
553 /* Otherwise, just copy the node. Note that copy_tree_r already
554 knows not to copy VAR_DECLs, etc., so this is safe. */
557 /* Here we handle trees that are not completely rewritten.
558 First we detect some inlining-induced bogosities for
560 if (TREE_CODE (*tp) == MODIFY_EXPR
561 && TREE_OPERAND (*tp, 0) == TREE_OPERAND (*tp, 1)
562 && (lang_hooks.tree_inlining.auto_var_in_fn_p
563 (TREE_OPERAND (*tp, 0), fn)))
565 /* Some assignments VAR = VAR; don't generate any rtl code
566 and thus don't count as variable modification. Avoid
567 keeping bogosities like 0 = 0. */
568 tree decl = TREE_OPERAND (*tp, 0), value;
571 n = splay_tree_lookup (id->decl_map, (splay_tree_key) decl);
574 value = (tree) n->value;
575 STRIP_TYPE_NOPS (value);
576 if (TREE_CONSTANT (value) || TREE_READONLY_DECL_P (value))
578 *tp = build_empty_stmt ();
579 return copy_body_r (tp, walk_subtrees, data);
583 else if (TREE_CODE (*tp) == INDIRECT_REF)
585 /* Get rid of *& from inline substitutions that can happen when a
586 pointer argument is an ADDR_EXPR. */
587 tree decl = TREE_OPERAND (*tp, 0);
590 n = splay_tree_lookup (id->decl_map, (splay_tree_key) decl);
595 /* If we happen to get an ADDR_EXPR in n->value, strip
596 it manually here as we'll eventually get ADDR_EXPRs
597 which lie about their types pointed to. In this case
598 build_fold_indirect_ref wouldn't strip the INDIRECT_REF,
599 but we absolutely rely on that. As fold_indirect_ref
600 does other useful transformations, try that first, though. */
601 tree type = TREE_TYPE (TREE_TYPE ((tree)n->value));
602 new = unshare_expr ((tree)n->value);
604 *tp = fold_indirect_ref_1 (type, new);
607 if (TREE_CODE (new) == ADDR_EXPR)
608 *tp = TREE_OPERAND (new, 0);
611 *tp = build1 (INDIRECT_REF, type, new);
612 TREE_THIS_VOLATILE (*tp) = TREE_THIS_VOLATILE (old);
620 /* Here is the "usual case". Copy this tree node, and then
621 tweak some special cases. */
622 copy_tree_r (tp, walk_subtrees, NULL);
624 /* If EXPR has block defined, map it to newly constructed block.
625 When inlining we want EXPRs without block appear in the block
627 if (IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (TREE_CODE (*tp))))
629 new_block = id->block;
630 if (TREE_BLOCK (*tp))
633 n = splay_tree_lookup (id->decl_map,
634 (splay_tree_key) TREE_BLOCK (*tp));
636 new_block = (tree) n->value;
638 TREE_BLOCK (*tp) = new_block;
641 if (TREE_CODE (*tp) == RESX_EXPR && id->eh_region_offset)
642 TREE_OPERAND (*tp, 0) =
645 id->eh_region_offset + TREE_INT_CST_LOW (TREE_OPERAND (*tp, 0)));
647 TREE_TYPE (*tp) = remap_type (TREE_TYPE (*tp), id);
649 /* The copied TARGET_EXPR has never been expanded, even if the
650 original node was expanded already. */
651 if (TREE_CODE (*tp) == TARGET_EXPR && TREE_OPERAND (*tp, 3))
653 TREE_OPERAND (*tp, 1) = TREE_OPERAND (*tp, 3);
654 TREE_OPERAND (*tp, 3) = NULL_TREE;
657 /* Variable substitution need not be simple. In particular, the
658 INDIRECT_REF substitution above. Make sure that TREE_CONSTANT
659 and friends are up-to-date. */
660 else if (TREE_CODE (*tp) == ADDR_EXPR)
662 walk_tree (&TREE_OPERAND (*tp, 0), copy_body_r, id, NULL);
663 /* Handle the case where we substituted an INDIRECT_REF
664 into the operand of the ADDR_EXPR. */
665 if (TREE_CODE (TREE_OPERAND (*tp, 0)) == INDIRECT_REF)
666 *tp = TREE_OPERAND (TREE_OPERAND (*tp, 0), 0);
668 recompute_tree_invariant_for_addr_expr (*tp);
673 /* Keep iterating. */
677 /* Copy basic block, scale profile accordingly. Edges will be taken care of
681 copy_bb (copy_body_data *id, basic_block bb, int frequency_scale, int count_scale)
683 block_stmt_iterator bsi, copy_bsi;
684 basic_block copy_basic_block;
686 /* create_basic_block() will append every new block to
687 basic_block_info automatically. */
688 copy_basic_block = create_basic_block (NULL, (void *) 0,
689 (basic_block) bb->prev_bb->aux);
690 copy_basic_block->count = bb->count * count_scale / REG_BR_PROB_BASE;
691 copy_basic_block->frequency = (bb->frequency
692 * frequency_scale / REG_BR_PROB_BASE);
693 copy_bsi = bsi_start (copy_basic_block);
695 for (bsi = bsi_start (bb);
696 !bsi_end_p (bsi); bsi_next (&bsi))
698 tree stmt = bsi_stmt (bsi);
699 tree orig_stmt = stmt;
701 walk_tree (&stmt, copy_body_r, id, NULL);
703 /* RETURN_EXPR might be removed,
704 this is signalled by making stmt pointer NULL. */
709 /* With return slot optimization we can end up with
710 non-gimple (foo *)&this->m, fix that here. */
711 if (TREE_CODE (stmt) == MODIFY_EXPR
712 && TREE_CODE (TREE_OPERAND (stmt, 1)) == NOP_EXPR
713 && !is_gimple_val (TREE_OPERAND (TREE_OPERAND (stmt, 1), 0)))
714 gimplify_stmt (&stmt);
716 bsi_insert_after (©_bsi, stmt, BSI_NEW_STMT);
717 call = get_call_expr_in (stmt);
718 /* We're duplicating a CALL_EXPR. Find any corresponding
719 callgraph edges and update or duplicate them. */
720 if (call && (decl = get_callee_fndecl (call)))
722 struct cgraph_node *node;
723 struct cgraph_edge *edge;
725 switch (id->transform_call_graph_edges)
727 case CB_CGE_DUPLICATE:
728 edge = cgraph_edge (id->src_node, orig_stmt);
730 cgraph_clone_edge (edge, id->dst_node, stmt,
731 REG_BR_PROB_BASE, 1, true);
734 case CB_CGE_MOVE_CLONES:
735 for (node = id->dst_node->next_clone;
737 node = node->next_clone)
739 edge = cgraph_edge (node, orig_stmt);
741 cgraph_set_call_stmt (edge, stmt);
746 edge = cgraph_edge (id->dst_node, orig_stmt);
748 cgraph_set_call_stmt (edge, stmt);
755 /* If you think we can abort here, you are wrong.
756 There is no region 0 in tree land. */
757 gcc_assert (lookup_stmt_eh_region_fn (id->src_cfun, orig_stmt)
760 if (tree_could_throw_p (stmt))
762 int region = lookup_stmt_eh_region_fn (id->src_cfun, orig_stmt);
763 /* Add an entry for the copied tree in the EH hashtable.
764 When cloning or versioning, use the hashtable in
765 cfun, and just copy the EH number. When inlining, use the
766 hashtable in the caller, and adjust the region number. */
768 add_stmt_to_eh_region (stmt, region + id->eh_region_offset);
770 /* If this tree doesn't have a region associated with it,
771 and there is a "current region,"
772 then associate this tree with the current region
773 and add edges associated with this region. */
774 if ((lookup_stmt_eh_region_fn (id->src_cfun,
776 && id->eh_region > 0)
777 && tree_could_throw_p (stmt))
778 add_stmt_to_eh_region (stmt, id->eh_region);
782 return copy_basic_block;
785 /* Copy edges from BB into its copy constructed earlier, scale profile
786 accordingly. Edges will be taken care of later. Assume aux
787 pointers to point to the copies of each BB. */
789 copy_edges_for_bb (basic_block bb, int count_scale)
791 basic_block new_bb = (basic_block) bb->aux;
794 block_stmt_iterator bsi;
797 /* Use the indices from the original blocks to create edges for the
799 FOR_EACH_EDGE (old_edge, ei, bb->succs)
800 if (!(old_edge->flags & EDGE_EH))
804 flags = old_edge->flags;
806 /* Return edges do get a FALLTHRU flag when the get inlined. */
807 if (old_edge->dest->index == EXIT_BLOCK && !old_edge->flags
808 && old_edge->dest->aux != EXIT_BLOCK_PTR)
809 flags |= EDGE_FALLTHRU;
810 new = make_edge (new_bb, (basic_block) old_edge->dest->aux, flags);
811 new->count = old_edge->count * count_scale / REG_BR_PROB_BASE;
812 new->probability = old_edge->probability;
815 if (bb->index == ENTRY_BLOCK || bb->index == EXIT_BLOCK)
818 for (bsi = bsi_start (new_bb); !bsi_end_p (bsi);)
822 copy_stmt = bsi_stmt (bsi);
823 update_stmt (copy_stmt);
824 /* Do this before the possible split_block. */
827 /* If this tree could throw an exception, there are two
828 cases where we need to add abnormal edge(s): the
829 tree wasn't in a region and there is a "current
830 region" in the caller; or the original tree had
831 EH edges. In both cases split the block after the tree,
832 and add abnormal edge(s) as needed; we need both
833 those from the callee and the caller.
834 We check whether the copy can throw, because the const
835 propagation can change an INDIRECT_REF which throws
836 into a COMPONENT_REF which doesn't. If the copy
837 can throw, the original could also throw. */
839 if (tree_can_throw_internal (copy_stmt))
841 if (!bsi_end_p (bsi))
842 /* Note that bb's predecessor edges aren't necessarily
843 right at this point; split_block doesn't care. */
845 edge e = split_block (new_bb, copy_stmt);
847 bsi = bsi_start (new_bb);
850 make_eh_edges (copy_stmt);
855 /* Wrapper for remap_decl so it can be used as a callback. */
857 remap_decl_1 (tree decl, void *data)
859 return remap_decl (decl, (copy_body_data *) data);
862 /* Make a copy of the body of FN so that it can be inserted inline in
863 another function. Walks FN via CFG, returns new fndecl. */
866 copy_cfg_body (copy_body_data * id, gcov_type count, int frequency,
867 basic_block entry_block_map, basic_block exit_block_map)
869 tree callee_fndecl = id->src_fn;
870 /* Original cfun for the callee, doesn't change. */
871 struct function *src_cfun = DECL_STRUCT_FUNCTION (callee_fndecl);
872 /* Copy, built by this function. */
873 struct function *new_cfun;
874 /* Place to copy from; when a copy of the function was saved off earlier,
875 use that instead of the main copy. */
876 struct function *cfun_to_copy =
877 (struct function *) ggc_alloc_cleared (sizeof (struct function));
879 tree new_fndecl = NULL;
880 int count_scale, frequency_scale;
882 if (ENTRY_BLOCK_PTR_FOR_FUNCTION (src_cfun)->count)
883 count_scale = (REG_BR_PROB_BASE * count
884 / ENTRY_BLOCK_PTR_FOR_FUNCTION (src_cfun)->count);
888 if (ENTRY_BLOCK_PTR_FOR_FUNCTION (src_cfun)->frequency)
889 frequency_scale = (REG_BR_PROB_BASE * frequency
891 ENTRY_BLOCK_PTR_FOR_FUNCTION (src_cfun)->frequency);
893 frequency_scale = count_scale;
895 /* Register specific tree functions. */
896 tree_register_cfg_hooks ();
898 /* Must have a CFG here at this point. */
899 gcc_assert (ENTRY_BLOCK_PTR_FOR_FUNCTION
900 (DECL_STRUCT_FUNCTION (callee_fndecl)));
902 *cfun_to_copy = *DECL_STRUCT_FUNCTION (callee_fndecl);
904 id->src_cfun = cfun_to_copy;
906 /* If requested, create new basic_block_info and label_to_block_maps.
907 Otherwise, insert our new blocks and labels into the existing cfg. */
908 if (id->transform_new_cfg)
911 (struct function *) ggc_alloc_cleared (sizeof (struct function));
912 *new_cfun = *DECL_STRUCT_FUNCTION (callee_fndecl);
913 new_cfun->cfg = NULL;
914 new_cfun->decl = new_fndecl = copy_node (callee_fndecl);
915 new_cfun->ib_boundaries_block = NULL;
916 DECL_STRUCT_FUNCTION (new_fndecl) = new_cfun;
917 push_cfun (new_cfun);
918 init_empty_tree_cfg ();
920 ENTRY_BLOCK_PTR->count =
921 (ENTRY_BLOCK_PTR_FOR_FUNCTION (src_cfun)->count * count_scale /
923 ENTRY_BLOCK_PTR->frequency =
924 (ENTRY_BLOCK_PTR_FOR_FUNCTION (src_cfun)->frequency *
925 frequency_scale / REG_BR_PROB_BASE);
926 EXIT_BLOCK_PTR->count =
927 (EXIT_BLOCK_PTR_FOR_FUNCTION (src_cfun)->count * count_scale /
929 EXIT_BLOCK_PTR->frequency =
930 (EXIT_BLOCK_PTR_FOR_FUNCTION (src_cfun)->frequency *
931 frequency_scale / REG_BR_PROB_BASE);
933 entry_block_map = ENTRY_BLOCK_PTR;
934 exit_block_map = EXIT_BLOCK_PTR;
937 ENTRY_BLOCK_PTR_FOR_FUNCTION (cfun_to_copy)->aux = entry_block_map;
938 EXIT_BLOCK_PTR_FOR_FUNCTION (cfun_to_copy)->aux = exit_block_map;
940 /* Duplicate any exception-handling regions. */
943 if (id->transform_new_cfg)
944 init_eh_for_function ();
946 = duplicate_eh_regions (cfun_to_copy, remap_decl_1, id,
949 /* Use aux pointers to map the original blocks to copy. */
950 FOR_EACH_BB_FN (bb, cfun_to_copy)
951 bb->aux = copy_bb (id, bb, frequency_scale, count_scale);
952 /* Now that we've duplicated the blocks, duplicate their edges. */
953 FOR_ALL_BB_FN (bb, cfun_to_copy)
954 copy_edges_for_bb (bb, count_scale);
955 FOR_ALL_BB_FN (bb, cfun_to_copy)
958 if (id->transform_new_cfg)
964 /* Make a copy of the body of FN so that it can be inserted inline in
968 copy_generic_body (copy_body_data *id)
971 tree fndecl = id->src_fn;
973 body = DECL_SAVED_TREE (fndecl);
974 walk_tree (&body, copy_body_r, id, NULL);
980 copy_body (copy_body_data *id, gcov_type count, int frequency,
981 basic_block entry_block_map, basic_block exit_block_map)
983 tree fndecl = id->src_fn;
986 /* If this body has a CFG, walk CFG and copy. */
987 gcc_assert (ENTRY_BLOCK_PTR_FOR_FUNCTION (DECL_STRUCT_FUNCTION (fndecl)));
988 body = copy_cfg_body (id, count, frequency, entry_block_map, exit_block_map);
993 /* Return true if VALUE is an ADDR_EXPR of an automatic variable
994 defined in function FN, or of a data member thereof. */
997 self_inlining_addr_expr (tree value, tree fn)
1001 if (TREE_CODE (value) != ADDR_EXPR)
1004 var = get_base_address (TREE_OPERAND (value, 0));
1006 return var && lang_hooks.tree_inlining.auto_var_in_fn_p (var, fn);
1010 setup_one_parameter (copy_body_data *id, tree p, tree value, tree fn,
1011 basic_block bb, tree *vars)
1017 /* If the parameter is never assigned to, we may not need to
1018 create a new variable here at all. Instead, we may be able
1019 to just use the argument value. */
1020 if (TREE_READONLY (p)
1021 && !TREE_ADDRESSABLE (p)
1022 && value && !TREE_SIDE_EFFECTS (value))
1024 /* We may produce non-gimple trees by adding NOPs or introduce
1025 invalid sharing when operand is not really constant.
1026 It is not big deal to prohibit constant propagation here as
1027 we will constant propagate in DOM1 pass anyway. */
1028 if (is_gimple_min_invariant (value)
1029 && lang_hooks.types_compatible_p (TREE_TYPE (value), TREE_TYPE (p))
1030 /* We have to be very careful about ADDR_EXPR. Make sure
1031 the base variable isn't a local variable of the inlined
1032 function, e.g., when doing recursive inlining, direct or
1033 mutually-recursive or whatever, which is why we don't
1034 just test whether fn == current_function_decl. */
1035 && ! self_inlining_addr_expr (value, fn))
1037 insert_decl_map (id, p, value);
1042 /* Make an equivalent VAR_DECL. Note that we must NOT remap the type
1043 here since the type of this decl must be visible to the calling
1045 var = copy_decl_to_var (p, id);
1047 /* See if the frontend wants to pass this by invisible reference. If
1048 so, our new VAR_DECL will have REFERENCE_TYPE, and we need to
1049 replace uses of the PARM_DECL with dereferences. */
1050 if (TREE_TYPE (var) != TREE_TYPE (p)
1051 && POINTER_TYPE_P (TREE_TYPE (var))
1052 && TREE_TYPE (TREE_TYPE (var)) == TREE_TYPE (p))
1054 insert_decl_map (id, var, var);
1055 var_sub = build_fold_indirect_ref (var);
1060 /* Register the VAR_DECL as the equivalent for the PARM_DECL;
1061 that way, when the PARM_DECL is encountered, it will be
1062 automatically replaced by the VAR_DECL. */
1063 insert_decl_map (id, p, var_sub);
1065 /* Declare this new variable. */
1066 TREE_CHAIN (var) = *vars;
1069 /* Make gimplifier happy about this variable. */
1070 DECL_SEEN_IN_BIND_EXPR_P (var) = 1;
1072 /* Even if P was TREE_READONLY, the new VAR should not be.
1073 In the original code, we would have constructed a
1074 temporary, and then the function body would have never
1075 changed the value of P. However, now, we will be
1076 constructing VAR directly. The constructor body may
1077 change its value multiple times as it is being
1078 constructed. Therefore, it must not be TREE_READONLY;
1079 the back-end assumes that TREE_READONLY variable is
1080 assigned to only once. */
1081 if (TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (p)))
1082 TREE_READONLY (var) = 0;
1084 /* Initialize this VAR_DECL from the equivalent argument. Convert
1085 the argument to the proper type in case it was promoted. */
1088 tree rhs = fold_convert (TREE_TYPE (var), value);
1089 block_stmt_iterator bsi = bsi_last (bb);
1091 if (rhs == error_mark_node)
1094 STRIP_USELESS_TYPE_CONVERSION (rhs);
1096 /* We want to use MODIFY_EXPR, not INIT_EXPR here so that we
1097 keep our trees in gimple form. */
1098 init_stmt = build2 (MODIFY_EXPR, TREE_TYPE (var), var, rhs);
1100 /* If we did not create a gimple value and we did not create a gimple
1101 cast of a gimple value, then we will need to gimplify INIT_STMTS
1102 at the end. Note that is_gimple_cast only checks the outer
1103 tree code, not its operand. Thus the explicit check that its
1104 operand is a gimple value. */
1105 if (!is_gimple_val (rhs)
1106 && (!is_gimple_cast (rhs)
1107 || !is_gimple_val (TREE_OPERAND (rhs, 0))))
1108 gimplify_stmt (&init_stmt);
1110 /* If VAR represents a zero-sized variable, it's possible that the
1111 assignment statment may result in no gimple statements. */
1113 bsi_insert_after (&bsi, init_stmt, BSI_NEW_STMT);
1117 /* Generate code to initialize the parameters of the function at the
1118 top of the stack in ID from the ARGS (presented as a TREE_LIST). */
1121 initialize_inlined_parameters (copy_body_data *id, tree args, tree static_chain,
1122 tree fn, basic_block bb)
1127 tree vars = NULL_TREE;
1130 /* Figure out what the parameters are. */
1131 parms = DECL_ARGUMENTS (fn);
1133 /* Loop through the parameter declarations, replacing each with an
1134 equivalent VAR_DECL, appropriately initialized. */
1135 for (p = parms, a = args; p;
1136 a = a ? TREE_CHAIN (a) : a, p = TREE_CHAIN (p))
1142 /* Find the initializer. */
1143 value = lang_hooks.tree_inlining.convert_parm_for_inlining
1144 (p, a ? TREE_VALUE (a) : NULL_TREE, fn, argnum);
1146 setup_one_parameter (id, p, value, fn, bb, &vars);
1149 /* Initialize the static chain. */
1150 p = DECL_STRUCT_FUNCTION (fn)->static_chain_decl;
1151 gcc_assert (fn != current_function_decl);
1154 /* No static chain? Seems like a bug in tree-nested.c. */
1155 gcc_assert (static_chain);
1157 setup_one_parameter (id, p, static_chain, fn, bb, &vars);
1160 declare_inline_vars (id->block, vars);
1163 /* Declare a return variable to replace the RESULT_DECL for the
1164 function we are calling. An appropriate DECL_STMT is returned.
1165 The USE_STMT is filled to contain a use of the declaration to
1166 indicate the return value of the function.
1168 RETURN_SLOT_ADDR, if non-null, was a fake parameter that
1169 took the address of the result. MODIFY_DEST, if non-null, was the LHS of
1170 the MODIFY_EXPR to which this call is the RHS.
1172 The return value is a (possibly null) value that is the result of the
1173 function as seen by the callee. *USE_P is a (possibly null) value that
1174 holds the result as seen by the caller. */
1177 declare_return_variable (copy_body_data *id, tree return_slot_addr,
1178 tree modify_dest, tree *use_p)
1180 tree callee = id->src_fn;
1181 tree caller = id->dst_fn;
1182 tree result = DECL_RESULT (callee);
1183 tree callee_type = TREE_TYPE (result);
1184 tree caller_type = TREE_TYPE (TREE_TYPE (callee));
1187 /* We don't need to do anything for functions that don't return
1189 if (!result || VOID_TYPE_P (callee_type))
1195 /* If there was a return slot, then the return value is the
1196 dereferenced address of that object. */
1197 if (return_slot_addr)
1199 /* The front end shouldn't have used both return_slot_addr and
1200 a modify expression. */
1201 gcc_assert (!modify_dest);
1202 if (DECL_BY_REFERENCE (result))
1203 var = return_slot_addr;
1205 var = build_fold_indirect_ref (return_slot_addr);
1206 if (TREE_CODE (TREE_TYPE (result)) == COMPLEX_TYPE
1207 && !DECL_COMPLEX_GIMPLE_REG_P (result)
1209 DECL_COMPLEX_GIMPLE_REG_P (var) = 0;
1214 /* All types requiring non-trivial constructors should have been handled. */
1215 gcc_assert (!TREE_ADDRESSABLE (callee_type));
1217 /* Attempt to avoid creating a new temporary variable. */
1220 bool use_it = false;
1222 /* We can't use MODIFY_DEST if there's type promotion involved. */
1223 if (!lang_hooks.types_compatible_p (caller_type, callee_type))
1226 /* ??? If we're assigning to a variable sized type, then we must
1227 reuse the destination variable, because we've no good way to
1228 create variable sized temporaries at this point. */
1229 else if (TREE_CODE (TYPE_SIZE_UNIT (caller_type)) != INTEGER_CST)
1232 /* If the callee cannot possibly modify MODIFY_DEST, then we can
1233 reuse it as the result of the call directly. Don't do this if
1234 it would promote MODIFY_DEST to addressable. */
1235 else if (TREE_ADDRESSABLE (result))
1239 tree base_m = get_base_address (modify_dest);
1241 /* If the base isn't a decl, then it's a pointer, and we don't
1242 know where that's going to go. */
1243 if (!DECL_P (base_m))
1245 else if (is_global_var (base_m))
1247 else if (TREE_CODE (TREE_TYPE (result)) == COMPLEX_TYPE
1248 && !DECL_COMPLEX_GIMPLE_REG_P (result)
1249 && DECL_COMPLEX_GIMPLE_REG_P (base_m))
1251 else if (!TREE_ADDRESSABLE (base_m))
1263 gcc_assert (TREE_CODE (TYPE_SIZE_UNIT (callee_type)) == INTEGER_CST);
1265 var = copy_result_decl_to_var (result, id);
1267 DECL_SEEN_IN_BIND_EXPR_P (var) = 1;
1268 DECL_STRUCT_FUNCTION (caller)->unexpanded_var_list
1269 = tree_cons (NULL_TREE, var,
1270 DECL_STRUCT_FUNCTION (caller)->unexpanded_var_list);
1272 /* Do not have the rest of GCC warn about this variable as it should
1273 not be visible to the user. */
1274 TREE_NO_WARNING (var) = 1;
1276 declare_inline_vars (id->block, var);
1278 /* Build the use expr. If the return type of the function was
1279 promoted, convert it back to the expected type. */
1281 if (!lang_hooks.types_compatible_p (TREE_TYPE (var), caller_type))
1282 use = fold_convert (caller_type, var);
1284 STRIP_USELESS_TYPE_CONVERSION (use);
1286 if (DECL_BY_REFERENCE (result))
1287 var = build_fold_addr_expr (var);
1290 /* Register the VAR_DECL as the equivalent for the RESULT_DECL; that
1291 way, when the RESULT_DECL is encountered, it will be
1292 automatically replaced by the VAR_DECL. */
1293 insert_decl_map (id, result, var);
1295 /* Remember this so we can ignore it in remap_decls. */
1302 /* Returns nonzero if a function can be inlined as a tree. */
1305 tree_inlinable_function_p (tree fn)
1307 return inlinable_function_p (fn);
1310 static const char *inline_forbidden_reason;
1313 inline_forbidden_p_1 (tree *nodep, int *walk_subtrees ATTRIBUTE_UNUSED,
1317 tree fn = (tree) fnp;
1320 switch (TREE_CODE (node))
1323 /* Refuse to inline alloca call unless user explicitly forced so as
1324 this may change program's memory overhead drastically when the
1325 function using alloca is called in loop. In GCC present in
1326 SPEC2000 inlining into schedule_block cause it to require 2GB of
1327 RAM instead of 256MB. */
1328 if (alloca_call_p (node)
1329 && !lookup_attribute ("always_inline", DECL_ATTRIBUTES (fn)))
1331 inline_forbidden_reason
1332 = G_("function %q+F can never be inlined because it uses "
1333 "alloca (override using the always_inline attribute)");
1336 t = get_callee_fndecl (node);
1340 /* We cannot inline functions that call setjmp. */
1341 if (setjmp_call_p (t))
1343 inline_forbidden_reason
1344 = G_("function %q+F can never be inlined because it uses setjmp");
1348 if (DECL_BUILT_IN_CLASS (t) == BUILT_IN_NORMAL)
1349 switch (DECL_FUNCTION_CODE (t))
1351 /* We cannot inline functions that take a variable number of
1353 case BUILT_IN_VA_START:
1354 case BUILT_IN_STDARG_START:
1355 case BUILT_IN_NEXT_ARG:
1356 case BUILT_IN_VA_END:
1357 inline_forbidden_reason
1358 = G_("function %q+F can never be inlined because it "
1359 "uses variable argument lists");
1362 case BUILT_IN_LONGJMP:
1363 /* We can't inline functions that call __builtin_longjmp at
1364 all. The non-local goto machinery really requires the
1365 destination be in a different function. If we allow the
1366 function calling __builtin_longjmp to be inlined into the
1367 function calling __builtin_setjmp, Things will Go Awry. */
1368 inline_forbidden_reason
1369 = G_("function %q+F can never be inlined because "
1370 "it uses setjmp-longjmp exception handling");
1373 case BUILT_IN_NONLOCAL_GOTO:
1375 inline_forbidden_reason
1376 = G_("function %q+F can never be inlined because "
1377 "it uses non-local goto");
1380 case BUILT_IN_RETURN:
1381 case BUILT_IN_APPLY_ARGS:
1382 /* If a __builtin_apply_args caller would be inlined,
1383 it would be saving arguments of the function it has
1384 been inlined into. Similarly __builtin_return would
1385 return from the function the inline has been inlined into. */
1386 inline_forbidden_reason
1387 = G_("function %q+F can never be inlined because "
1388 "it uses __builtin_return or __builtin_apply_args");
1397 t = TREE_OPERAND (node, 0);
1399 /* We will not inline a function which uses computed goto. The
1400 addresses of its local labels, which may be tucked into
1401 global storage, are of course not constant across
1402 instantiations, which causes unexpected behavior. */
1403 if (TREE_CODE (t) != LABEL_DECL)
1405 inline_forbidden_reason
1406 = G_("function %q+F can never be inlined "
1407 "because it contains a computed goto");
1413 t = TREE_OPERAND (node, 0);
1414 if (DECL_NONLOCAL (t))
1416 /* We cannot inline a function that receives a non-local goto
1417 because we cannot remap the destination label used in the
1418 function that is performing the non-local goto. */
1419 inline_forbidden_reason
1420 = G_("function %q+F can never be inlined "
1421 "because it receives a non-local goto");
1428 /* We cannot inline a function of the form
1430 void F (int i) { struct S { int ar[i]; } s; }
1432 Attempting to do so produces a catch-22.
1433 If walk_tree examines the TYPE_FIELDS chain of RECORD_TYPE/
1434 UNION_TYPE nodes, then it goes into infinite recursion on a
1435 structure containing a pointer to its own type. If it doesn't,
1436 then the type node for S doesn't get adjusted properly when
1439 ??? This is likely no longer true, but it's too late in the 4.0
1440 cycle to try to find out. This should be checked for 4.1. */
1441 for (t = TYPE_FIELDS (node); t; t = TREE_CHAIN (t))
1442 if (variably_modified_type_p (TREE_TYPE (t), NULL))
1444 inline_forbidden_reason
1445 = G_("function %q+F can never be inlined "
1446 "because it uses variable sized variables");
1457 /* Return subexpression representing possible alloca call, if any. */
1459 inline_forbidden_p (tree fndecl)
1461 location_t saved_loc = input_location;
1462 block_stmt_iterator bsi;
1464 tree ret = NULL_TREE;
1466 FOR_EACH_BB_FN (bb, DECL_STRUCT_FUNCTION (fndecl))
1467 for (bsi = bsi_start (bb); !bsi_end_p (bsi); bsi_next (&bsi))
1469 ret = walk_tree_without_duplicates (bsi_stmt_ptr (bsi),
1470 inline_forbidden_p_1, fndecl);
1476 input_location = saved_loc;
1480 /* Returns nonzero if FN is a function that does not have any
1481 fundamental inline blocking properties. */
1484 inlinable_function_p (tree fn)
1486 bool inlinable = true;
1488 /* If we've already decided this function shouldn't be inlined,
1489 there's no need to check again. */
1490 if (DECL_UNINLINABLE (fn))
1493 /* See if there is any language-specific reason it cannot be
1494 inlined. (It is important that this hook be called early because
1495 in C++ it may result in template instantiation.)
1496 If the function is not inlinable for language-specific reasons,
1497 it is left up to the langhook to explain why. */
1498 inlinable = !lang_hooks.tree_inlining.cannot_inline_tree_fn (&fn);
1500 /* If we don't have the function body available, we can't inline it.
1501 However, this should not be recorded since we also get here for
1502 forward declared inline functions. Therefore, return at once. */
1503 if (!DECL_SAVED_TREE (fn))
1506 /* If we're not inlining at all, then we cannot inline this function. */
1507 else if (!flag_inline_trees)
1510 /* Only try to inline functions if DECL_INLINE is set. This should be
1511 true for all functions declared `inline', and for all other functions
1512 as well with -finline-functions.
1514 Don't think of disregarding DECL_INLINE when flag_inline_trees == 2;
1515 it's the front-end that must set DECL_INLINE in this case, because
1516 dwarf2out loses if a function that does not have DECL_INLINE set is
1517 inlined anyway. That is why we have both DECL_INLINE and
1518 DECL_DECLARED_INLINE_P. */
1519 /* FIXME: When flag_inline_trees dies, the check for flag_unit_at_a_time
1520 here should be redundant. */
1521 else if (!DECL_INLINE (fn) && !flag_unit_at_a_time)
1524 else if (inline_forbidden_p (fn))
1526 /* See if we should warn about uninlinable functions. Previously,
1527 some of these warnings would be issued while trying to expand
1528 the function inline, but that would cause multiple warnings
1529 about functions that would for example call alloca. But since
1530 this a property of the function, just one warning is enough.
1531 As a bonus we can now give more details about the reason why a
1532 function is not inlinable.
1533 We only warn for functions declared `inline' by the user. */
1534 bool do_warning = (warn_inline
1536 && DECL_DECLARED_INLINE_P (fn)
1537 && !DECL_IN_SYSTEM_HEADER (fn));
1539 if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (fn)))
1540 sorry (inline_forbidden_reason, fn);
1541 else if (do_warning)
1542 warning (OPT_Winline, inline_forbidden_reason, fn);
1547 /* Squirrel away the result so that we don't have to check again. */
1548 DECL_UNINLINABLE (fn) = !inlinable;
1553 /* Estimate the cost of a memory move. Use machine dependent
1554 word size and take possible memcpy call into account. */
1557 estimate_move_cost (tree type)
1561 size = int_size_in_bytes (type);
1563 if (size < 0 || size > MOVE_MAX_PIECES * MOVE_RATIO)
1564 /* Cost of a memcpy call, 3 arguments and the call. */
1567 return ((size + MOVE_MAX_PIECES - 1) / MOVE_MAX_PIECES);
1570 /* Used by estimate_num_insns. Estimate number of instructions seen
1571 by given statement. */
1574 estimate_num_insns_1 (tree *tp, int *walk_subtrees, void *data)
1576 int *count = (int *) data;
1579 if (IS_TYPE_OR_DECL_P (x))
1584 /* Assume that constants and references counts nothing. These should
1585 be majorized by amount of operations among them we count later
1586 and are common target of CSE and similar optimizations. */
1587 else if (CONSTANT_CLASS_P (x) || REFERENCE_CLASS_P (x))
1590 switch (TREE_CODE (x))
1592 /* Containers have no cost. */
1599 case ALIGN_INDIRECT_REF:
1600 case MISALIGNED_INDIRECT_REF:
1602 case ARRAY_RANGE_REF:
1604 case EXC_PTR_EXPR: /* ??? */
1605 case FILTER_EXPR: /* ??? */
1608 case WITH_CLEANUP_EXPR:
1610 case VIEW_CONVERT_EXPR:
1615 case CASE_LABEL_EXPR:
1618 case EH_FILTER_EXPR:
1619 case STATEMENT_LIST:
1621 case NON_LVALUE_EXPR:
1624 case TRY_CATCH_EXPR:
1625 case TRY_FINALLY_EXPR:
1632 case WITH_SIZE_EXPR:
1638 /* We don't account constants for now. Assume that the cost is amortized
1639 by operations that do use them. We may re-consider this decision once
1640 we are able to optimize the tree before estimating its size and break
1641 out static initializers. */
1642 case IDENTIFIER_NODE:
1651 /* Try to estimate the cost of assignments. We have three cases to
1653 1) Simple assignments to registers;
1654 2) Stores to things that must live in memory. This includes
1655 "normal" stores to scalars, but also assignments of large
1656 structures, or constructors of big arrays;
1659 Let us look at the first two cases, assuming we have "a = b + C":
1660 <modify_expr <var_decl "a"> <plus_expr <var_decl "b"> <constant C>>
1661 If "a" is a GIMPLE register, the assignment to it is free on almost
1662 any target, because "a" usually ends up in a real register. Hence
1663 the only cost of this expression comes from the PLUS_EXPR, and we
1664 can ignore the MODIFY_EXPR.
1665 If "a" is not a GIMPLE register, the assignment to "a" will most
1666 likely be a real store, so the cost of the MODIFY_EXPR is the cost
1667 of moving something into "a", which we compute using the function
1670 The third case deals with TARGET_EXPRs, for which the semantics are
1671 that a temporary is assigned, unless the TARGET_EXPR itself is being
1672 assigned to something else. In the latter case we do not need the
1673 temporary. E.g. in <modify_expr <var_decl "a"> <target_expr>>, the
1674 MODIFY_EXPR is free. */
1677 /* Is the right and side a TARGET_EXPR? */
1678 if (TREE_CODE (TREE_OPERAND (x, 1)) == TARGET_EXPR)
1680 /* ... fall through ... */
1683 x = TREE_OPERAND (x, 0);
1684 /* Is this an assignments to a register? */
1685 if (is_gimple_reg (x))
1687 /* Otherwise it's a store, so fall through to compute the move cost. */
1690 *count += estimate_move_cost (TREE_TYPE (x));
1693 /* Assign cost of 1 to usual operations.
1694 ??? We may consider mapping RTL costs to this. */
1702 case FIX_TRUNC_EXPR:
1704 case FIX_FLOOR_EXPR:
1705 case FIX_ROUND_EXPR:
1717 case VEC_LSHIFT_EXPR:
1718 case VEC_RSHIFT_EXPR:
1725 case TRUTH_ANDIF_EXPR:
1726 case TRUTH_ORIF_EXPR:
1727 case TRUTH_AND_EXPR:
1729 case TRUTH_XOR_EXPR:
1730 case TRUTH_NOT_EXPR:
1739 case UNORDERED_EXPR:
1752 case PREDECREMENT_EXPR:
1753 case PREINCREMENT_EXPR:
1754 case POSTDECREMENT_EXPR:
1755 case POSTINCREMENT_EXPR:
1761 case REALIGN_LOAD_EXPR:
1763 case REDUC_MAX_EXPR:
1764 case REDUC_MIN_EXPR:
1765 case REDUC_PLUS_EXPR:
1766 case WIDEN_SUM_EXPR:
1769 case WIDEN_MULT_EXPR:
1775 /* Few special cases of expensive operations. This is useful
1776 to avoid inlining on functions having too many of these. */
1777 case TRUNC_DIV_EXPR:
1779 case FLOOR_DIV_EXPR:
1780 case ROUND_DIV_EXPR:
1781 case EXACT_DIV_EXPR:
1782 case TRUNC_MOD_EXPR:
1784 case FLOOR_MOD_EXPR:
1785 case ROUND_MOD_EXPR:
1791 tree decl = get_callee_fndecl (x);
1794 if (decl && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
1795 switch (DECL_FUNCTION_CODE (decl))
1797 case BUILT_IN_CONSTANT_P:
1800 case BUILT_IN_EXPECT:
1806 /* Our cost must be kept in sync with cgraph_estimate_size_after_inlining
1807 that does use function declaration to figure out the arguments. */
1810 for (arg = TREE_OPERAND (x, 1); arg; arg = TREE_CHAIN (arg))
1811 *count += estimate_move_cost (TREE_TYPE (TREE_VALUE (arg)));
1815 for (arg = DECL_ARGUMENTS (decl); arg; arg = TREE_CHAIN (arg))
1816 *count += estimate_move_cost (TREE_TYPE (arg));
1819 *count += PARAM_VALUE (PARAM_INLINE_CALL_COST);
1832 /* OpenMP directives are generally very expensive. */
1842 /* Estimate number of instructions that will be created by expanding EXPR. */
1845 estimate_num_insns (tree expr)
1848 struct pointer_set_t *visited_nodes;
1850 block_stmt_iterator bsi;
1851 struct function *my_function;
1853 /* If we're given an entire function, walk the CFG. */
1854 if (TREE_CODE (expr) == FUNCTION_DECL)
1856 my_function = DECL_STRUCT_FUNCTION (expr);
1857 gcc_assert (my_function && my_function->cfg);
1858 visited_nodes = pointer_set_create ();
1859 FOR_EACH_BB_FN (bb, my_function)
1861 for (bsi = bsi_start (bb);
1865 walk_tree (bsi_stmt_ptr (bsi), estimate_num_insns_1,
1866 &num, visited_nodes);
1869 pointer_set_destroy (visited_nodes);
1872 walk_tree_without_duplicates (&expr, estimate_num_insns_1, &num);
1877 typedef struct function *function_p;
1879 DEF_VEC_P(function_p);
1880 DEF_VEC_ALLOC_P(function_p,heap);
1882 /* Initialized with NOGC, making this poisonous to the garbage collector. */
1883 static VEC(function_p,heap) *cfun_stack;
1886 push_cfun (struct function *new_cfun)
1888 VEC_safe_push (function_p, heap, cfun_stack, cfun);
1895 cfun = VEC_pop (function_p, cfun_stack);
1898 /* Install new lexical TREE_BLOCK underneath 'current_block'. */
1900 add_lexical_block (tree current_block, tree new_block)
1904 /* Walk to the last sub-block. */
1905 for (blk_p = &BLOCK_SUBBLOCKS (current_block);
1907 blk_p = &TREE_CHAIN (*blk_p))
1910 BLOCK_SUPERCONTEXT (new_block) = current_block;
1913 /* If *TP is a CALL_EXPR, replace it with its inline expansion. */
1916 expand_call_inline (basic_block bb, tree stmt, tree *tp, void *data)
1924 tree return_slot_addr;
1926 location_t saved_location;
1927 struct cgraph_edge *cg_edge;
1929 basic_block return_block;
1931 block_stmt_iterator bsi, stmt_bsi;
1932 bool successfully_inlined = FALSE;
1933 bool purge_dead_abnormal_edges;
1937 /* See what we've got. */
1938 id = (copy_body_data *) data;
1941 /* Set input_location here so we get the right instantiation context
1942 if we call instantiate_decl from inlinable_function_p. */
1943 saved_location = input_location;
1944 if (EXPR_HAS_LOCATION (t))
1945 input_location = EXPR_LOCATION (t);
1947 /* From here on, we're only interested in CALL_EXPRs. */
1948 if (TREE_CODE (t) != CALL_EXPR)
1951 /* First, see if we can figure out what function is being called.
1952 If we cannot, then there is no hope of inlining the function. */
1953 fn = get_callee_fndecl (t);
1957 /* Turn forward declarations into real ones. */
1958 fn = cgraph_node (fn)->decl;
1960 /* If fn is a declaration of a function in a nested scope that was
1961 globally declared inline, we don't set its DECL_INITIAL.
1962 However, we can't blindly follow DECL_ABSTRACT_ORIGIN because the
1963 C++ front-end uses it for cdtors to refer to their internal
1964 declarations, that are not real functions. Fortunately those
1965 don't have trees to be saved, so we can tell by checking their
1967 if (! DECL_INITIAL (fn)
1968 && DECL_ABSTRACT_ORIGIN (fn)
1969 && DECL_SAVED_TREE (DECL_ABSTRACT_ORIGIN (fn)))
1970 fn = DECL_ABSTRACT_ORIGIN (fn);
1972 /* Objective C and fortran still calls tree_rest_of_compilation directly.
1973 Kill this check once this is fixed. */
1974 if (!id->dst_node->analyzed)
1977 cg_edge = cgraph_edge (id->dst_node, stmt);
1979 /* Constant propagation on argument done during previous inlining
1980 may create new direct call. Produce an edge for it. */
1983 struct cgraph_node *dest = cgraph_node (fn);
1985 /* We have missing edge in the callgraph. This can happen in one case
1986 where previous inlining turned indirect call into direct call by
1987 constant propagating arguments. In all other cases we hit a bug
1988 (incorrect node sharing is most common reason for missing edges. */
1989 gcc_assert (dest->needed || !flag_unit_at_a_time);
1990 cgraph_create_edge (id->dst_node, dest, stmt,
1991 bb->count, bb->loop_depth)->inline_failed
1992 = N_("originally indirect function call not considered for inlining");
1996 /* Don't try to inline functions that are not well-suited to
1998 if (!cgraph_inline_p (cg_edge, &reason))
2000 if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (fn))
2001 /* Avoid warnings during early inline pass. */
2002 && (!flag_unit_at_a_time || cgraph_global_info_ready))
2004 sorry ("inlining failed in call to %q+F: %s", fn, reason);
2005 sorry ("called from here");
2007 else if (warn_inline && DECL_DECLARED_INLINE_P (fn)
2008 && !DECL_IN_SYSTEM_HEADER (fn)
2010 && !lookup_attribute ("noinline", DECL_ATTRIBUTES (fn))
2011 /* Avoid warnings during early inline pass. */
2012 && (!flag_unit_at_a_time || cgraph_global_info_ready))
2014 warning (OPT_Winline, "inlining failed in call to %q+F: %s",
2016 warning (OPT_Winline, "called from here");
2020 fn = cg_edge->callee->decl;
2022 #ifdef ENABLE_CHECKING
2023 if (cg_edge->callee->decl != id->dst_node->decl)
2024 verify_cgraph_node (cg_edge->callee);
2027 /* We will be inlining this callee. */
2028 id->eh_region = lookup_stmt_eh_region (stmt);
2030 /* Split the block holding the CALL_EXPR. */
2031 e = split_block (bb, stmt);
2033 return_block = e->dest;
2036 /* split_block splits after the statement; work around this by
2037 moving the call into the second block manually. Not pretty,
2038 but seems easier than doing the CFG manipulation by hand
2039 when the CALL_EXPR is in the last statement of BB. */
2040 stmt_bsi = bsi_last (bb);
2041 bsi_remove (&stmt_bsi, false);
2043 /* If the CALL_EXPR was in the last statement of BB, it may have
2044 been the source of abnormal edges. In this case, schedule
2045 the removal of dead abnormal edges. */
2046 bsi = bsi_start (return_block);
2047 if (bsi_end_p (bsi))
2049 bsi_insert_after (&bsi, stmt, BSI_NEW_STMT);
2050 purge_dead_abnormal_edges = true;
2054 bsi_insert_before (&bsi, stmt, BSI_NEW_STMT);
2055 purge_dead_abnormal_edges = false;
2058 stmt_bsi = bsi_start (return_block);
2060 /* Build a block containing code to initialize the arguments, the
2061 actual inline expansion of the body, and a label for the return
2062 statements within the function to jump to. The type of the
2063 statement expression is the return type of the function call. */
2064 id->block = make_node (BLOCK);
2065 BLOCK_ABSTRACT_ORIGIN (id->block) = fn;
2066 BLOCK_SOURCE_LOCATION (id->block) = input_location;
2067 add_lexical_block (TREE_BLOCK (stmt), id->block);
2069 /* Local declarations will be replaced by their equivalents in this
2072 id->decl_map = splay_tree_new (splay_tree_compare_pointers,
2075 /* Initialize the parameters. */
2076 args = TREE_OPERAND (t, 1);
2078 /* Record the function we are about to inline. */
2080 id->src_node = cg_edge->callee;
2082 initialize_inlined_parameters (id, args, TREE_OPERAND (t, 2), fn, bb);
2084 if (DECL_INITIAL (fn))
2085 add_lexical_block (id->block, remap_blocks (DECL_INITIAL (fn), id));
2087 /* Return statements in the function body will be replaced by jumps
2088 to the RET_LABEL. */
2090 gcc_assert (DECL_INITIAL (fn));
2091 gcc_assert (TREE_CODE (DECL_INITIAL (fn)) == BLOCK);
2093 /* Find the lhs to which the result of this call is assigned. */
2094 return_slot_addr = NULL;
2095 if (TREE_CODE (stmt) == MODIFY_EXPR)
2097 modify_dest = TREE_OPERAND (stmt, 0);
2099 /* The function which we are inlining might not return a value,
2100 in which case we should issue a warning that the function
2101 does not return a value. In that case the optimizers will
2102 see that the variable to which the value is assigned was not
2103 initialized. We do not want to issue a warning about that
2104 uninitialized variable. */
2105 if (DECL_P (modify_dest))
2106 TREE_NO_WARNING (modify_dest) = 1;
2107 if (CALL_EXPR_RETURN_SLOT_OPT (t))
2109 return_slot_addr = build_fold_addr_expr (modify_dest);
2110 STRIP_USELESS_TYPE_CONVERSION (return_slot_addr);
2117 /* Declare the return variable for the function. */
2118 declare_return_variable (id, return_slot_addr,
2119 modify_dest, &use_retvar);
2121 /* This is it. Duplicate the callee body. Assume callee is
2122 pre-gimplified. Note that we must not alter the caller
2123 function in any way before this point, as this CALL_EXPR may be
2124 a self-referential call; if we're calling ourselves, we need to
2125 duplicate our body before altering anything. */
2126 copy_body (id, bb->count, bb->frequency, bb, return_block);
2128 /* Add local vars in this inlined callee to caller. */
2129 t_step = id->src_cfun->unexpanded_var_list;
2130 for (; t_step; t_step = TREE_CHAIN (t_step))
2132 var = TREE_VALUE (t_step);
2133 if (TREE_STATIC (var) && !TREE_ASM_WRITTEN (var))
2134 cfun->unexpanded_var_list = tree_cons (NULL_TREE, var,
2135 cfun->unexpanded_var_list);
2137 cfun->unexpanded_var_list = tree_cons (NULL_TREE, remap_decl (var, id),
2138 cfun->unexpanded_var_list);
2142 splay_tree_delete (id->decl_map);
2145 /* If the inlined function returns a result that we care about,
2146 clobber the CALL_EXPR with a reference to the return variable. */
2147 if (use_retvar && (TREE_CODE (bsi_stmt (stmt_bsi)) != CALL_EXPR))
2150 maybe_clean_or_replace_eh_stmt (stmt, stmt);
2153 /* We're modifying a TSI owned by gimple_expand_calls_inline();
2154 tsi_delink() will leave the iterator in a sane state. */
2155 bsi_remove (&stmt_bsi, true);
2157 if (purge_dead_abnormal_edges)
2158 tree_purge_dead_abnormal_call_edges (return_block);
2160 /* If the value of the new expression is ignored, that's OK. We
2161 don't warn about this for CALL_EXPRs, so we shouldn't warn about
2162 the equivalent inlined version either. */
2163 TREE_USED (*tp) = 1;
2165 /* Output the inlining info for this abstract function, since it has been
2166 inlined. If we don't do this now, we can lose the information about the
2167 variables in the function when the blocks get blown away as soon as we
2168 remove the cgraph node. */
2169 (*debug_hooks->outlining_inline_function) (cg_edge->callee->decl);
2171 /* Update callgraph if needed. */
2172 cgraph_remove_node (cg_edge->callee);
2174 id->block = NULL_TREE;
2175 successfully_inlined = TRUE;
2178 input_location = saved_location;
2179 return successfully_inlined;
2182 /* Expand call statements reachable from STMT_P.
2183 We can only have CALL_EXPRs as the "toplevel" tree code or nested
2184 in a MODIFY_EXPR. See tree-gimple.c:get_call_expr_in(). We can
2185 unfortunately not use that function here because we need a pointer
2186 to the CALL_EXPR, not the tree itself. */
2189 gimple_expand_calls_inline (basic_block bb, copy_body_data *id)
2191 block_stmt_iterator bsi;
2193 /* Register specific tree functions. */
2194 tree_register_cfg_hooks ();
2195 for (bsi = bsi_start (bb); !bsi_end_p (bsi); bsi_next (&bsi))
2197 tree *expr_p = bsi_stmt_ptr (bsi);
2198 tree stmt = *expr_p;
2200 if (TREE_CODE (*expr_p) == MODIFY_EXPR)
2201 expr_p = &TREE_OPERAND (*expr_p, 1);
2202 if (TREE_CODE (*expr_p) == WITH_SIZE_EXPR)
2203 expr_p = &TREE_OPERAND (*expr_p, 0);
2204 if (TREE_CODE (*expr_p) == CALL_EXPR)
2205 if (expand_call_inline (bb, stmt, expr_p, id))
2211 /* Expand calls to inline functions in the body of FN. */
2214 optimize_inline_calls (tree fn)
2219 /* There is no point in performing inlining if errors have already
2220 occurred -- and we might crash if we try to inline invalid
2222 if (errorcount || sorrycount)
2226 memset (&id, 0, sizeof (id));
2228 id.src_node = id.dst_node = cgraph_node (fn);
2230 /* Or any functions that aren't finished yet. */
2231 prev_fn = NULL_TREE;
2232 if (current_function_decl)
2234 id.dst_fn = current_function_decl;
2235 prev_fn = current_function_decl;
2238 id.copy_decl = copy_decl_maybe_to_var;
2239 id.transform_call_graph_edges = CB_CGE_DUPLICATE;
2240 id.transform_new_cfg = false;
2241 id.transform_return_to_modify = true;
2242 id.transform_lang_insert_block = false;
2244 push_gimplify_context ();
2246 /* Reach the trees by walking over the CFG, and note the
2247 enclosing basic-blocks in the call edges. */
2248 /* We walk the blocks going forward, because inlined function bodies
2249 will split id->current_basic_block, and the new blocks will
2250 follow it; we'll trudge through them, processing their CALL_EXPRs
2253 gimple_expand_calls_inline (bb, &id);
2255 pop_gimplify_context (NULL);
2256 /* Renumber the (code) basic_blocks consecutively. */
2258 /* Renumber the lexical scoping (non-code) blocks consecutively. */
2261 #ifdef ENABLE_CHECKING
2263 struct cgraph_edge *e;
2265 verify_cgraph_node (id.dst_node);
2267 /* Double check that we inlined everything we are supposed to inline. */
2268 for (e = id.dst_node->callees; e; e = e->next_callee)
2269 gcc_assert (e->inline_failed);
2272 /* We need to rescale frequencies again to peak at REG_BR_PROB_BASE
2273 as inlining loops might increase the maximum. */
2274 if (ENTRY_BLOCK_PTR->count)
2276 fold_cond_expr_cond ();
2279 /* FN is a function that has a complete body, and CLONE is a function whose
2280 body is to be set to a copy of FN, mapping argument declarations according
2281 to the ARG_MAP splay_tree. */
2284 clone_body (tree clone, tree fn, void *arg_map)
2288 /* Clone the body, as if we were making an inline call. But, remap the
2289 parameters in the callee to the parameters of caller. */
2290 memset (&id, 0, sizeof (id));
2293 id.src_cfun = DECL_STRUCT_FUNCTION (fn);
2294 id.decl_map = (splay_tree)arg_map;
2296 id.copy_decl = copy_decl_no_change;
2297 id.transform_call_graph_edges = CB_CGE_DUPLICATE;
2298 id.transform_new_cfg = true;
2299 id.transform_return_to_modify = false;
2300 id.transform_lang_insert_block = true;
2302 /* We're not inside any EH region. */
2305 /* Actually copy the body. */
2306 append_to_statement_list_force (copy_generic_body (&id), &DECL_SAVED_TREE (clone));
2309 /* Passed to walk_tree. Copies the node pointed to, if appropriate. */
2312 copy_tree_r (tree *tp, int *walk_subtrees, void *data ATTRIBUTE_UNUSED)
2314 enum tree_code code = TREE_CODE (*tp);
2316 /* We make copies of most nodes. */
2317 if (IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (code))
2318 || code == TREE_LIST
2320 || code == TYPE_DECL
2321 || code == OMP_CLAUSE)
2323 /* Because the chain gets clobbered when we make a copy, we save it
2325 tree chain = TREE_CHAIN (*tp);
2328 /* Copy the node. */
2329 new = copy_node (*tp);
2331 /* Propagate mudflap marked-ness. */
2332 if (flag_mudflap && mf_marked_p (*tp))
2337 /* Now, restore the chain, if appropriate. That will cause
2338 walk_tree to walk into the chain as well. */
2339 if (code == PARM_DECL
2340 || code == TREE_LIST
2341 || code == OMP_CLAUSE)
2342 TREE_CHAIN (*tp) = chain;
2344 /* For now, we don't update BLOCKs when we make copies. So, we
2345 have to nullify all BIND_EXPRs. */
2346 if (TREE_CODE (*tp) == BIND_EXPR)
2347 BIND_EXPR_BLOCK (*tp) = NULL_TREE;
2349 else if (code == CONSTRUCTOR)
2351 /* CONSTRUCTOR nodes need special handling because
2352 we need to duplicate the vector of elements. */
2355 new = copy_node (*tp);
2357 /* Propagate mudflap marked-ness. */
2358 if (flag_mudflap && mf_marked_p (*tp))
2361 CONSTRUCTOR_ELTS (new) = VEC_copy (constructor_elt, gc,
2362 CONSTRUCTOR_ELTS (*tp));
2365 else if (TREE_CODE_CLASS (code) == tcc_type)
2367 else if (TREE_CODE_CLASS (code) == tcc_declaration)
2369 else if (TREE_CODE_CLASS (code) == tcc_constant)
2372 gcc_assert (code != STATEMENT_LIST);
2376 /* The SAVE_EXPR pointed to by TP is being copied. If ST contains
2377 information indicating to what new SAVE_EXPR this one should be mapped,
2378 use that one. Otherwise, create a new node and enter it in ST. FN is
2379 the function into which the copy will be placed. */
2382 remap_save_expr (tree *tp, void *st_, int *walk_subtrees)
2384 splay_tree st = (splay_tree) st_;
2388 /* See if we already encountered this SAVE_EXPR. */
2389 n = splay_tree_lookup (st, (splay_tree_key) *tp);
2391 /* If we didn't already remap this SAVE_EXPR, do so now. */
2394 t = copy_node (*tp);
2396 /* Remember this SAVE_EXPR. */
2397 splay_tree_insert (st, (splay_tree_key) *tp, (splay_tree_value) t);
2398 /* Make sure we don't remap an already-remapped SAVE_EXPR. */
2399 splay_tree_insert (st, (splay_tree_key) t, (splay_tree_value) t);
2403 /* We've already walked into this SAVE_EXPR; don't do it again. */
2405 t = (tree) n->value;
2408 /* Replace this SAVE_EXPR with the copy. */
2412 /* Called via walk_tree. If *TP points to a DECL_STMT for a local label,
2413 copies the declaration and enters it in the splay_tree in DATA (which is
2414 really an `copy_body_data *'). */
2417 mark_local_for_remap_r (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
2420 copy_body_data *id = (copy_body_data *) data;
2422 /* Don't walk into types. */
2426 else if (TREE_CODE (*tp) == LABEL_EXPR)
2428 tree decl = TREE_OPERAND (*tp, 0);
2430 /* Copy the decl and remember the copy. */
2431 insert_decl_map (id, decl, id->copy_decl (decl, id));
2437 /* Perform any modifications to EXPR required when it is unsaved. Does
2438 not recurse into EXPR's subtrees. */
2441 unsave_expr_1 (tree expr)
2443 switch (TREE_CODE (expr))
2446 /* Don't mess with a TARGET_EXPR that hasn't been expanded.
2447 It's OK for this to happen if it was part of a subtree that
2448 isn't immediately expanded, such as operand 2 of another
2450 if (TREE_OPERAND (expr, 1))
2453 TREE_OPERAND (expr, 1) = TREE_OPERAND (expr, 3);
2454 TREE_OPERAND (expr, 3) = NULL_TREE;
2462 /* Called via walk_tree when an expression is unsaved. Using the
2463 splay_tree pointed to by ST (which is really a `splay_tree'),
2464 remaps all local declarations to appropriate replacements. */
2467 unsave_r (tree *tp, int *walk_subtrees, void *data)
2469 copy_body_data *id = (copy_body_data *) data;
2470 splay_tree st = id->decl_map;
2473 /* Only a local declaration (variable or label). */
2474 if ((TREE_CODE (*tp) == VAR_DECL && !TREE_STATIC (*tp))
2475 || TREE_CODE (*tp) == LABEL_DECL)
2477 /* Lookup the declaration. */
2478 n = splay_tree_lookup (st, (splay_tree_key) *tp);
2480 /* If it's there, remap it. */
2482 *tp = (tree) n->value;
2485 else if (TREE_CODE (*tp) == STATEMENT_LIST)
2486 copy_statement_list (tp);
2487 else if (TREE_CODE (*tp) == BIND_EXPR)
2488 copy_bind_expr (tp, walk_subtrees, id);
2489 else if (TREE_CODE (*tp) == SAVE_EXPR)
2490 remap_save_expr (tp, st, walk_subtrees);
2493 copy_tree_r (tp, walk_subtrees, NULL);
2495 /* Do whatever unsaving is required. */
2496 unsave_expr_1 (*tp);
2499 /* Keep iterating. */
2503 /* Copies everything in EXPR and replaces variables, labels
2504 and SAVE_EXPRs local to EXPR. */
2507 unsave_expr_now (tree expr)
2511 /* There's nothing to do for NULL_TREE. */
2516 memset (&id, 0, sizeof (id));
2517 id.src_fn = current_function_decl;
2518 id.dst_fn = current_function_decl;
2519 id.decl_map = splay_tree_new (splay_tree_compare_pointers, NULL, NULL);
2521 id.copy_decl = copy_decl_no_change;
2522 id.transform_call_graph_edges = CB_CGE_DUPLICATE;
2523 id.transform_new_cfg = false;
2524 id.transform_return_to_modify = false;
2525 id.transform_lang_insert_block = false;
2527 /* Walk the tree once to find local labels. */
2528 walk_tree_without_duplicates (&expr, mark_local_for_remap_r, &id);
2530 /* Walk the tree again, copying, remapping, and unsaving. */
2531 walk_tree (&expr, unsave_r, &id, NULL);
2534 splay_tree_delete (id.decl_map);
2539 /* Allow someone to determine if SEARCH is a child of TOP from gdb. */
2542 debug_find_tree_1 (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED, void *data)
2551 debug_find_tree (tree top, tree search)
2553 return walk_tree_without_duplicates (&top, debug_find_tree_1, search) != 0;
2557 /* Declare the variables created by the inliner. Add all the variables in
2558 VARS to BIND_EXPR. */
2561 declare_inline_vars (tree block, tree vars)
2564 for (t = vars; t; t = TREE_CHAIN (t))
2566 DECL_SEEN_IN_BIND_EXPR_P (t) = 1;
2567 gcc_assert (!TREE_STATIC (t) && !TREE_ASM_WRITTEN (t));
2568 cfun->unexpanded_var_list =
2569 tree_cons (NULL_TREE, t,
2570 cfun->unexpanded_var_list);
2574 BLOCK_VARS (block) = chainon (BLOCK_VARS (block), vars);
2578 /* Copy NODE (which must be a DECL). The DECL originally was in the FROM_FN,
2579 but now it will be in the TO_FN. PARM_TO_VAR means enable PARM_DECL to
2580 VAR_DECL translation. */
2583 copy_decl_for_dup_finish (copy_body_data *id, tree decl, tree copy)
2585 /* Don't generate debug information for the copy if we wouldn't have
2586 generated it for the copy either. */
2587 DECL_ARTIFICIAL (copy) = DECL_ARTIFICIAL (decl);
2588 DECL_IGNORED_P (copy) = DECL_IGNORED_P (decl);
2590 /* Set the DECL_ABSTRACT_ORIGIN so the debugging routines know what
2591 declaration inspired this copy. */
2592 DECL_ABSTRACT_ORIGIN (copy) = DECL_ORIGIN (decl);
2594 /* The new variable/label has no RTL, yet. */
2595 if (CODE_CONTAINS_STRUCT (TREE_CODE (copy), TS_DECL_WRTL)
2596 && !TREE_STATIC (copy) && !DECL_EXTERNAL (copy))
2597 SET_DECL_RTL (copy, NULL_RTX);
2599 /* These args would always appear unused, if not for this. */
2600 TREE_USED (copy) = 1;
2602 /* Set the context for the new declaration. */
2603 if (!DECL_CONTEXT (decl))
2604 /* Globals stay global. */
2606 else if (DECL_CONTEXT (decl) != id->src_fn)
2607 /* Things that weren't in the scope of the function we're inlining
2608 from aren't in the scope we're inlining to, either. */
2610 else if (TREE_STATIC (decl))
2611 /* Function-scoped static variables should stay in the original
2615 /* Ordinary automatic local variables are now in the scope of the
2617 DECL_CONTEXT (copy) = id->dst_fn;
2623 copy_decl_to_var (tree decl, copy_body_data *id)
2627 gcc_assert (TREE_CODE (decl) == PARM_DECL
2628 || TREE_CODE (decl) == RESULT_DECL);
2630 type = TREE_TYPE (decl);
2632 copy = build_decl (VAR_DECL, DECL_NAME (decl), type);
2633 TREE_ADDRESSABLE (copy) = TREE_ADDRESSABLE (decl);
2634 TREE_READONLY (copy) = TREE_READONLY (decl);
2635 TREE_THIS_VOLATILE (copy) = TREE_THIS_VOLATILE (decl);
2636 DECL_COMPLEX_GIMPLE_REG_P (copy) = DECL_COMPLEX_GIMPLE_REG_P (decl);
2638 return copy_decl_for_dup_finish (id, decl, copy);
2641 /* Like copy_decl_to_var, but create a return slot object instead of a
2642 pointer variable for return by invisible reference. */
2645 copy_result_decl_to_var (tree decl, copy_body_data *id)
2649 gcc_assert (TREE_CODE (decl) == PARM_DECL
2650 || TREE_CODE (decl) == RESULT_DECL);
2652 type = TREE_TYPE (decl);
2653 if (DECL_BY_REFERENCE (decl))
2654 type = TREE_TYPE (type);
2656 copy = build_decl (VAR_DECL, DECL_NAME (decl), type);
2657 TREE_READONLY (copy) = TREE_READONLY (decl);
2658 TREE_THIS_VOLATILE (copy) = TREE_THIS_VOLATILE (decl);
2659 if (!DECL_BY_REFERENCE (decl))
2661 TREE_ADDRESSABLE (copy) = TREE_ADDRESSABLE (decl);
2662 DECL_COMPLEX_GIMPLE_REG_P (copy) = DECL_COMPLEX_GIMPLE_REG_P (decl);
2665 return copy_decl_for_dup_finish (id, decl, copy);
2670 copy_decl_no_change (tree decl, copy_body_data *id)
2674 copy = copy_node (decl);
2676 /* The COPY is not abstract; it will be generated in DST_FN. */
2677 DECL_ABSTRACT (copy) = 0;
2678 lang_hooks.dup_lang_specific_decl (copy);
2680 /* TREE_ADDRESSABLE isn't used to indicate that a label's address has
2681 been taken; it's for internal bookkeeping in expand_goto_internal. */
2682 if (TREE_CODE (copy) == LABEL_DECL)
2684 TREE_ADDRESSABLE (copy) = 0;
2685 LABEL_DECL_UID (copy) = -1;
2688 return copy_decl_for_dup_finish (id, decl, copy);
2692 copy_decl_maybe_to_var (tree decl, copy_body_data *id)
2694 if (TREE_CODE (decl) == PARM_DECL || TREE_CODE (decl) == RESULT_DECL)
2695 return copy_decl_to_var (decl, id);
2697 return copy_decl_no_change (decl, id);
2700 /* Return a copy of the function's argument tree. */
2702 copy_arguments_for_versioning (tree orig_parm, copy_body_data * id)
2704 tree *arg_copy, *parg;
2706 arg_copy = &orig_parm;
2707 for (parg = arg_copy; *parg; parg = &TREE_CHAIN (*parg))
2709 tree new = remap_decl (*parg, id);
2710 lang_hooks.dup_lang_specific_decl (new);
2711 TREE_CHAIN (new) = TREE_CHAIN (*parg);
2717 /* Return a copy of the function's static chain. */
2719 copy_static_chain (tree static_chain, copy_body_data * id)
2721 tree *chain_copy, *pvar;
2723 chain_copy = &static_chain;
2724 for (pvar = chain_copy; *pvar; pvar = &TREE_CHAIN (*pvar))
2726 tree new = remap_decl (*pvar, id);
2727 lang_hooks.dup_lang_specific_decl (new);
2728 TREE_CHAIN (new) = TREE_CHAIN (*pvar);
2731 return static_chain;
2734 /* Return true if the function is allowed to be versioned.
2735 This is a guard for the versioning functionality. */
2737 tree_versionable_function_p (tree fndecl)
2739 if (fndecl == NULL_TREE)
2741 /* ??? There are cases where a function is
2742 uninlinable but can be versioned. */
2743 if (!tree_inlinable_function_p (fndecl))
2749 /* Create a copy of a function's tree.
2750 OLD_DECL and NEW_DECL are FUNCTION_DECL tree nodes
2751 of the original function and the new copied function
2752 respectively. In case we want to replace a DECL
2753 tree with another tree while duplicating the function's
2754 body, TREE_MAP represents the mapping between these
2755 trees. If UPDATE_CLONES is set, the call_stmt fields
2756 of edges of clones of the function will be updated. */
2758 tree_function_versioning (tree old_decl, tree new_decl, varray_type tree_map,
2761 struct cgraph_node *old_version_node;
2762 struct cgraph_node *new_version_node;
2766 struct ipa_replace_map *replace_info;
2767 basic_block old_entry_block;
2770 gcc_assert (TREE_CODE (old_decl) == FUNCTION_DECL
2771 && TREE_CODE (new_decl) == FUNCTION_DECL);
2772 DECL_POSSIBLY_INLINED (old_decl) = 1;
2774 old_version_node = cgraph_node (old_decl);
2775 new_version_node = cgraph_node (new_decl);
2777 allocate_struct_function (new_decl);
2778 /* Cfun points to the new allocated function struct at this point. */
2779 cfun->function_end_locus = DECL_SOURCE_LOCATION (new_decl);
2781 DECL_ARTIFICIAL (new_decl) = 1;
2782 DECL_ABSTRACT_ORIGIN (new_decl) = DECL_ORIGIN (old_decl);
2784 /* Generate a new name for the new version. */
2786 DECL_NAME (new_decl) = create_tmp_var_name (NULL);
2787 /* Create a new SYMBOL_REF rtx for the new name. */
2788 if (DECL_RTL (old_decl) != NULL)
2790 SET_DECL_RTL (new_decl, copy_rtx (DECL_RTL (old_decl)));
2791 XEXP (DECL_RTL (new_decl), 0) =
2792 gen_rtx_SYMBOL_REF (GET_MODE (XEXP (DECL_RTL (old_decl), 0)),
2793 IDENTIFIER_POINTER (DECL_NAME (new_decl)));
2796 /* Prepare the data structures for the tree copy. */
2797 memset (&id, 0, sizeof (id));
2799 id.decl_map = splay_tree_new (splay_tree_compare_pointers, NULL, NULL);
2800 id.src_fn = old_decl;
2801 id.dst_fn = new_decl;
2802 id.src_node = old_version_node;
2803 id.dst_node = new_version_node;
2804 id.src_cfun = DECL_STRUCT_FUNCTION (old_decl);
2806 id.copy_decl = copy_decl_no_change;
2807 id.transform_call_graph_edges
2808 = update_clones ? CB_CGE_MOVE_CLONES : CB_CGE_MOVE;
2809 id.transform_new_cfg = true;
2810 id.transform_return_to_modify = false;
2811 id.transform_lang_insert_block = false;
2813 current_function_decl = new_decl;
2815 /* Copy the function's static chain. */
2816 p = DECL_STRUCT_FUNCTION (old_decl)->static_chain_decl;
2818 DECL_STRUCT_FUNCTION (new_decl)->static_chain_decl =
2819 copy_static_chain (DECL_STRUCT_FUNCTION (old_decl)->static_chain_decl,
2821 /* Copy the function's arguments. */
2822 if (DECL_ARGUMENTS (old_decl) != NULL_TREE)
2823 DECL_ARGUMENTS (new_decl) =
2824 copy_arguments_for_versioning (DECL_ARGUMENTS (old_decl), &id);
2826 /* If there's a tree_map, prepare for substitution. */
2828 for (i = 0; i < VARRAY_ACTIVE_SIZE (tree_map); i++)
2830 replace_info = VARRAY_GENERIC_PTR (tree_map, i);
2831 if (replace_info->replace_p)
2832 insert_decl_map (&id, replace_info->old_tree,
2833 replace_info->new_tree);
2836 DECL_INITIAL (new_decl) = remap_blocks (DECL_INITIAL (id.src_fn), &id);
2838 /* Renumber the lexical scoping (non-code) blocks consecutively. */
2839 number_blocks (id.dst_fn);
2841 if (DECL_STRUCT_FUNCTION (old_decl)->unexpanded_var_list != NULL_TREE)
2842 /* Add local vars. */
2843 for (t_step = DECL_STRUCT_FUNCTION (old_decl)->unexpanded_var_list;
2844 t_step; t_step = TREE_CHAIN (t_step))
2846 tree var = TREE_VALUE (t_step);
2847 if (TREE_STATIC (var) && !TREE_ASM_WRITTEN (var))
2848 cfun->unexpanded_var_list = tree_cons (NULL_TREE, var,
2849 cfun->unexpanded_var_list);
2851 cfun->unexpanded_var_list =
2852 tree_cons (NULL_TREE, remap_decl (var, &id),
2853 cfun->unexpanded_var_list);
2856 /* Copy the Function's body. */
2857 old_entry_block = ENTRY_BLOCK_PTR_FOR_FUNCTION
2858 (DECL_STRUCT_FUNCTION (old_decl));
2859 new_fndecl = copy_body (&id,
2860 old_entry_block->count,
2861 old_entry_block->frequency, NULL, NULL);
2863 DECL_SAVED_TREE (new_decl) = DECL_SAVED_TREE (new_fndecl);
2865 DECL_STRUCT_FUNCTION (new_decl)->cfg =
2866 DECL_STRUCT_FUNCTION (new_fndecl)->cfg;
2867 DECL_STRUCT_FUNCTION (new_decl)->eh = DECL_STRUCT_FUNCTION (new_fndecl)->eh;
2868 DECL_STRUCT_FUNCTION (new_decl)->ib_boundaries_block =
2869 DECL_STRUCT_FUNCTION (new_fndecl)->ib_boundaries_block;
2870 DECL_STRUCT_FUNCTION (new_decl)->last_label_uid =
2871 DECL_STRUCT_FUNCTION (new_fndecl)->last_label_uid;
2873 if (DECL_RESULT (old_decl) != NULL_TREE)
2875 tree *res_decl = &DECL_RESULT (old_decl);
2876 DECL_RESULT (new_decl) = remap_decl (*res_decl, &id);
2877 lang_hooks.dup_lang_specific_decl (DECL_RESULT (new_decl));
2880 current_function_decl = NULL;
2881 /* Renumber the lexical scoping (non-code) blocks consecutively. */
2882 number_blocks (new_decl);
2885 splay_tree_delete (id.decl_map);
2886 fold_cond_expr_cond ();
2890 /* Duplicate a type, fields and all. */
2893 build_duplicate_type (tree type)
2895 struct copy_body_data id;
2897 memset (&id, 0, sizeof (id));
2898 id.src_fn = current_function_decl;
2899 id.dst_fn = current_function_decl;
2901 id.decl_map = splay_tree_new (splay_tree_compare_pointers, NULL, NULL);
2903 type = remap_type_1 (type, &id);
2905 splay_tree_delete (id.decl_map);