2 Copyright 2001, 2002, 2003, 2004 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, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
24 #include "coretypes.h"
28 #include "tree-inline.h"
34 #include "insn-config.h"
35 #include "integrate.h"
38 #include "splay-tree.h"
39 #include "langhooks.h"
42 #include "tree-mudflap.h"
44 #include "diagnostic.h"
46 /* I'm not real happy about this, but we need to handle gimple and
48 #include "tree-iterator.h"
49 #include "tree-gimple.h"
51 /* 0 if we should not perform inlining.
52 1 if we should expand functions calls inline at the tree level.
53 2 if we should consider *all* functions to be inline
56 int flag_inline_trees = 0;
60 o In order to make inlining-on-trees work, we pessimized
61 function-local static constants. In particular, they are now
62 always output, even when not addressed. Fix this by treating
63 function-local static constants just like global static
64 constants; the back-end already knows not to output them if they
67 o Provide heuristics to clamp inlining of recursive template
70 /* Data required for function inlining. */
72 typedef struct inline_data
74 /* A stack of the functions we are inlining. For example, if we are
75 compiling `f', which calls `g', which calls `h', and we are
76 inlining the body of `h', the stack will contain, `h', followed
77 by `g', followed by `f'. The first few elements of the stack may
78 contain other functions that we know we should not recurse into,
79 even though they are not directly being inlined. */
81 /* The index of the first element of FNS that really represents an
83 unsigned first_inlined_fn;
84 /* The label to jump to when a return statement is encountered. If
85 this value is NULL, then return statements will simply be
86 remapped as return statements, rather than as jumps. */
88 /* The VAR_DECL for the return value. */
90 /* The map from local declarations in the inlined function to
91 equivalents in the function into which it is being inlined. */
93 /* Nonzero if we are currently within the cleanup for a
95 int in_target_cleanup_p;
96 /* A list of the functions current function has inlined. */
97 varray_type inlined_fns;
98 /* We use the same mechanism to build clones that we do to perform
99 inlining. However, there are a few places where we need to
100 distinguish between those two situations. This flag is true if
101 we are cloning, rather than inlining. */
103 /* Similarly for saving function body. */
105 /* Hash table used to prevent walk_tree from visiting the same node
106 umpteen million times. */
108 /* Callgraph node of function we are inlining into. */
109 struct cgraph_node *node;
110 /* Callgraph node of currently inlined function. */
111 struct cgraph_node *current_node;
112 /* Statement iterator. We need this so we can keep the tree in
113 gimple form when we insert the inlined function. It is not
114 used when we are not dealing with gimple trees. */
115 tree_stmt_iterator tsi;
120 /* The approximate number of instructions per statement. This number
121 need not be particularly accurate; it is used only to make
122 decisions about when a function is too big to inline. */
123 #define INSNS_PER_STMT (10)
125 static tree declare_return_variable (inline_data *, tree, tree *);
126 static tree copy_body_r (tree *, int *, void *);
127 static tree copy_body (inline_data *);
128 static tree expand_call_inline (tree *, int *, void *);
129 static void expand_calls_inline (tree *, inline_data *);
130 static bool inlinable_function_p (tree);
131 static tree remap_decl (tree, inline_data *);
132 static tree remap_type (tree, inline_data *);
133 static tree initialize_inlined_parameters (inline_data *, tree,
135 static void remap_block (tree *, inline_data *);
136 static tree remap_decls (tree, inline_data *);
137 static void copy_bind_expr (tree *, int *, inline_data *);
138 static tree mark_local_for_remap_r (tree *, int *, void *);
139 static tree unsave_r (tree *, int *, void *);
140 static void declare_inline_vars (tree bind_expr, tree vars);
142 /* Insert a tree->tree mapping for ID. Despite the name suggests
143 that the trees should be variables, it is used for more than that. */
146 insert_decl_map (inline_data *id, tree key, tree value)
148 splay_tree_insert (id->decl_map, (splay_tree_key) key,
149 (splay_tree_value) value);
151 /* Always insert an identity map as well. If we see this same new
152 node again, we won't want to duplicate it a second time. */
154 splay_tree_insert (id->decl_map, (splay_tree_key) value,
155 (splay_tree_value) value);
158 /* Remap DECL during the copying of the BLOCK tree for the function. */
161 remap_decl (tree decl, inline_data *id)
166 /* We only remap local variables in the current function. */
167 fn = VARRAY_TOP_TREE (id->fns);
169 /* We need to remap statics, too, so that they get expanded even if the
170 inline function is never emitted out of line. We might as well also
171 remap extern decls so that they show up in the debug info. */
172 if (! lang_hooks.tree_inlining.auto_var_in_fn_p (decl, fn))
176 /* See if we have remapped this declaration. */
177 n = splay_tree_lookup (id->decl_map, (splay_tree_key) decl);
179 /* If we didn't already have an equivalent for this declaration,
185 /* Make a copy of the variable or label. */
186 t = copy_decl_for_inlining (decl, fn, VARRAY_TREE (id->fns, 0));
188 /* Remap types, if necessary. */
189 TREE_TYPE (t) = remap_type (TREE_TYPE (t), id);
190 if (TREE_CODE (t) == TYPE_DECL)
191 DECL_ORIGINAL_TYPE (t) = remap_type (DECL_ORIGINAL_TYPE (t), id);
192 else if (TREE_CODE (t) == PARM_DECL)
193 DECL_ARG_TYPE_AS_WRITTEN (t)
194 = remap_type (DECL_ARG_TYPE_AS_WRITTEN (t), id);
196 /* Remap sizes as necessary. */
197 walk_tree (&DECL_SIZE (t), copy_body_r, id, NULL);
198 walk_tree (&DECL_SIZE_UNIT (t), copy_body_r, id, NULL);
201 /* FIXME handle anon aggrs. */
202 if (! DECL_NAME (t) && TREE_TYPE (t)
203 && lang_hooks.tree_inlining.anon_aggr_type_p (TREE_TYPE (t)))
205 /* For a VAR_DECL of anonymous type, we must also copy the
206 member VAR_DECLS here and rechain the DECL_ANON_UNION_ELEMS. */
210 for (src = DECL_ANON_UNION_ELEMS (t); src;
211 src = TREE_CHAIN (src))
213 tree member = remap_decl (TREE_VALUE (src), id);
215 if (TREE_PURPOSE (src))
217 members = tree_cons (NULL, member, members);
219 DECL_ANON_UNION_ELEMS (t) = nreverse (members);
223 /* Remember it, so that if we encounter this local entity
224 again we can reuse this copy. */
225 insert_decl_map (id, decl, t);
229 return unshare_expr ((tree) n->value);
233 remap_type (tree type, inline_data *id)
235 splay_tree_node node;
241 /* See if we have remapped this type. */
242 node = splay_tree_lookup (id->decl_map, (splay_tree_key) type);
244 return (tree) node->value;
246 /* The type only needs remapping if it's variably modified. */
247 if (! variably_modified_type_p (type))
249 insert_decl_map (id, type, type);
253 /* We do need a copy. build and register it now. */
254 new = copy_node (type);
255 insert_decl_map (id, type, new);
257 /* This is a new type, not a copy of an old type. Need to reassociate
258 variants. We can handle everything except the main variant lazily. */
259 t = TYPE_MAIN_VARIANT (type);
262 t = remap_type (t, id);
263 TYPE_MAIN_VARIANT (new) = t;
264 TYPE_NEXT_VARIANT (new) = TYPE_MAIN_VARIANT (t);
265 TYPE_NEXT_VARIANT (t) = new;
269 TYPE_MAIN_VARIANT (new) = new;
270 TYPE_NEXT_VARIANT (new) = NULL;
273 /* Lazily create pointer and reference types. */
274 TYPE_POINTER_TO (new) = NULL;
275 TYPE_REFERENCE_TO (new) = NULL;
277 switch (TREE_CODE (new))
284 t = TYPE_MIN_VALUE (new);
285 if (t && TREE_CODE (t) != INTEGER_CST)
286 walk_tree (&TYPE_MIN_VALUE (new), copy_body_r, id, NULL);
288 t = TYPE_MAX_VALUE (new);
289 if (t && TREE_CODE (t) != INTEGER_CST)
290 walk_tree (&TYPE_MAX_VALUE (new), copy_body_r, id, NULL);
294 TREE_TYPE (new) = t = remap_type (TREE_TYPE (new), id);
295 TYPE_NEXT_PTR_TO (new) = TYPE_POINTER_TO (t);
296 TYPE_POINTER_TO (t) = new;
300 TREE_TYPE (new) = t = remap_type (TREE_TYPE (new), id);
301 TYPE_NEXT_REF_TO (new) = TYPE_REFERENCE_TO (t);
302 TYPE_REFERENCE_TO (t) = new;
307 TREE_TYPE (new) = remap_type (TREE_TYPE (new), id);
308 walk_tree (&TYPE_ARG_TYPES (new), copy_body_r, id, NULL);
312 TREE_TYPE (new) = remap_type (TREE_TYPE (new), id);
313 TYPE_DOMAIN (new) = remap_type (TYPE_DOMAIN (new), id);
318 case QUAL_UNION_TYPE:
319 walk_tree (&TYPE_FIELDS (new), copy_body_r, id, NULL);
326 /* Shouldn't have been thought variable sized. */
330 walk_tree (&TYPE_SIZE (new), copy_body_r, id, NULL);
331 walk_tree (&TYPE_SIZE_UNIT (new), copy_body_r, id, NULL);
337 remap_decls (tree decls, inline_data *id)
340 tree new_decls = NULL_TREE;
342 /* Remap its variables. */
343 for (old_var = decls; old_var; old_var = TREE_CHAIN (old_var))
347 /* Remap the variable. */
348 new_var = remap_decl (old_var, id);
350 /* If we didn't remap this variable, so we can't mess with its
351 TREE_CHAIN. If we remapped this variable to the return slot, it's
352 already declared somewhere else, so don't declare it here. */
353 if (!new_var || new_var == id->retvar)
355 #ifdef ENABLE_CHECKING
356 else if (!DECL_P (new_var))
361 TREE_CHAIN (new_var) = new_decls;
366 return nreverse (new_decls);
369 /* Copy the BLOCK to contain remapped versions of the variables
370 therein. And hook the new block into the block-tree. */
373 remap_block (tree *block, inline_data *id)
379 /* Make the new block. */
381 new_block = make_node (BLOCK);
382 TREE_USED (new_block) = TREE_USED (old_block);
383 BLOCK_ABSTRACT_ORIGIN (new_block) = old_block;
386 /* Remap its variables. */
387 BLOCK_VARS (new_block) = remap_decls (BLOCK_VARS (old_block), id);
389 fn = VARRAY_TREE (id->fns, 0);
391 /* FIXME! It shouldn't be so hard to manage blocks. Rebuilding them in
392 rest_of_compilation is a good start. */
394 /* We're building a clone; DECL_INITIAL is still
395 error_mark_node, and current_binding_level is the parm
397 lang_hooks.decls.insert_block (new_block);
400 /* Attach this new block after the DECL_INITIAL block for the
401 function into which this block is being inlined. In
402 rest_of_compilation we will straighten out the BLOCK tree. */
404 if (DECL_INITIAL (fn))
405 first_block = &BLOCK_CHAIN (DECL_INITIAL (fn));
407 first_block = &DECL_INITIAL (fn);
408 BLOCK_CHAIN (new_block) = *first_block;
409 *first_block = new_block;
412 /* Remember the remapped block. */
413 insert_decl_map (id, old_block, new_block);
417 copy_statement_list (tree *tp)
419 tree_stmt_iterator oi, ni;
422 new = alloc_stmt_list ();
423 ni = tsi_start (new);
424 oi = tsi_start (*tp);
427 for (; !tsi_end_p (oi); tsi_next (&oi))
428 tsi_link_after (&ni, tsi_stmt (oi), TSI_NEW_STMT);
432 copy_bind_expr (tree *tp, int *walk_subtrees, inline_data *id)
434 tree block = BIND_EXPR_BLOCK (*tp);
435 /* Copy (and replace) the statement. */
436 copy_tree_r (tp, walk_subtrees, NULL);
439 remap_block (&block, id);
440 BIND_EXPR_BLOCK (*tp) = block;
443 if (BIND_EXPR_VARS (*tp))
444 /* This will remap a lot of the same decls again, but this should be
446 BIND_EXPR_VARS (*tp) = remap_decls (BIND_EXPR_VARS (*tp), id);
449 /* Called from copy_body via walk_tree. DATA is really an `inline_data *'. */
452 copy_body_r (tree *tp, int *walk_subtrees, void *data)
458 id = (inline_data *) data;
459 fn = VARRAY_TOP_TREE (id->fns);
462 /* All automatic variables should have a DECL_CONTEXT indicating
463 what function they come from. */
464 if ((TREE_CODE (*tp) == VAR_DECL || TREE_CODE (*tp) == LABEL_DECL)
465 && DECL_NAMESPACE_SCOPE_P (*tp))
466 if (! DECL_EXTERNAL (*tp) && ! TREE_STATIC (*tp))
470 /* If this is a RETURN_EXPR, change it into a MODIFY_EXPR and a
471 GOTO_EXPR with the RET_LABEL as its target. */
472 if (TREE_CODE (*tp) == RETURN_EXPR && id->ret_label)
474 tree return_stmt = *tp;
477 /* Build the GOTO_EXPR. */
478 tree assignment = TREE_OPERAND (return_stmt, 0);
479 goto_stmt = build1 (GOTO_EXPR, void_type_node, id->ret_label);
480 TREE_USED (id->ret_label) = 1;
482 /* If we're returning something, just turn that into an
483 assignment into the equivalent of the original
487 /* Do not create a statement containing a naked RESULT_DECL. */
488 if (lang_hooks.gimple_before_inlining)
489 if (TREE_CODE (assignment) == RESULT_DECL)
490 gimplify_stmt (&assignment);
492 *tp = build (BIND_EXPR, void_type_node, NULL, NULL, NULL);
493 append_to_statement_list (assignment, &BIND_EXPR_BODY (*tp));
494 append_to_statement_list (goto_stmt, &BIND_EXPR_BODY (*tp));
496 /* If we're not returning anything just do the jump. */
500 /* Local variables and labels need to be replaced by equivalent
501 variables. We don't want to copy static variables; there's only
502 one of those, no matter how many times we inline the containing
504 else if (lang_hooks.tree_inlining.auto_var_in_fn_p (*tp, fn))
508 /* Remap the declaration. */
509 new_decl = remap_decl (*tp, id);
512 /* Replace this variable with the copy. */
513 STRIP_TYPE_NOPS (new_decl);
517 else if (nonstatic_local_decl_p (*tp)
518 && DECL_CONTEXT (*tp) != VARRAY_TREE (id->fns, 0))
521 else if (TREE_CODE (*tp) == STATEMENT_LIST)
522 copy_statement_list (tp);
523 else if (TREE_CODE (*tp) == SAVE_EXPR)
524 remap_save_expr (tp, id->decl_map, VARRAY_TREE (id->fns, 0),
526 else if (TREE_CODE (*tp) == UNSAVE_EXPR)
527 /* UNSAVE_EXPRs should not be generated until expansion time. */
529 else if (TREE_CODE (*tp) == BIND_EXPR)
530 copy_bind_expr (tp, walk_subtrees, id);
531 else if (TREE_CODE (*tp) == LABELED_BLOCK_EXPR)
533 /* We need a new copy of this labeled block; the EXIT_BLOCK_EXPR
534 will refer to it, so save a copy ready for remapping. We
535 save it in the decl_map, although it isn't a decl. */
536 tree new_block = copy_node (*tp);
537 insert_decl_map (id, *tp, new_block);
540 else if (TREE_CODE (*tp) == EXIT_BLOCK_EXPR)
543 = splay_tree_lookup (id->decl_map,
544 (splay_tree_key) TREE_OPERAND (*tp, 0));
545 /* We _must_ have seen the enclosing LABELED_BLOCK_EXPR. */
548 *tp = copy_node (*tp);
549 TREE_OPERAND (*tp, 0) = (tree) n->value;
551 /* Types may need remapping as well. */
552 else if (TYPE_P (*tp))
553 *tp = remap_type (*tp, id);
555 /* Otherwise, just copy the node. Note that copy_tree_r already
556 knows not to copy VAR_DECLs, etc., so this is safe. */
561 if (TREE_CODE (*tp) == MODIFY_EXPR
562 && TREE_OPERAND (*tp, 0) == TREE_OPERAND (*tp, 1)
563 && (lang_hooks.tree_inlining.auto_var_in_fn_p
564 (TREE_OPERAND (*tp, 0), fn)))
566 /* Some assignments VAR = VAR; don't generate any rtl code
567 and thus don't count as variable modification. Avoid
568 keeping bogosities like 0 = 0. */
569 tree decl = TREE_OPERAND (*tp, 0), value;
572 n = splay_tree_lookup (id->decl_map, (splay_tree_key) decl);
575 value = (tree) n->value;
576 STRIP_TYPE_NOPS (value);
577 if (TREE_CONSTANT (value) || TREE_READONLY_DECL_P (value))
580 return copy_body_r (tp, walk_subtrees, data);
584 else if (TREE_CODE (*tp) == ADDR_EXPR
585 && (lang_hooks.tree_inlining.auto_var_in_fn_p
586 (TREE_OPERAND (*tp, 0), fn)))
588 /* Get rid of &* from inline substitutions. It can occur when
589 someone takes the address of a parm or return slot passed by
590 invisible reference. */
591 tree decl = TREE_OPERAND (*tp, 0), value;
594 n = splay_tree_lookup (id->decl_map, (splay_tree_key) decl);
597 value = (tree) n->value;
598 if (TREE_CODE (value) == INDIRECT_REF)
600 /* Assume that the argument types properly match the
601 parameter types. We can't compare them well enough
602 without a comptypes langhook, and we don't want to
603 call convert and introduce a NOP_EXPR to convert
604 between two equivalent types (i.e. that only differ
605 in use of typedef names). */
606 *tp = TREE_OPERAND (value, 0);
607 return copy_body_r (tp, walk_subtrees, data);
611 else if (TREE_CODE (*tp) == INDIRECT_REF)
613 /* Get rid of *& from inline substitutions that can happen when a
614 pointer argument is an ADDR_EXPR. */
615 tree decl = TREE_OPERAND (*tp, 0), value;
618 n = splay_tree_lookup (id->decl_map, (splay_tree_key) decl);
621 value = (tree) n->value;
623 if (TREE_CODE (value) == ADDR_EXPR)
625 *tp = TREE_OPERAND (value, 0);
626 return copy_body_r (tp, walk_subtrees, data);
631 copy_tree_r (tp, walk_subtrees, NULL);
633 if (TREE_CODE (*tp) == CALL_EXPR && id->node && get_callee_fndecl (*tp))
637 struct cgraph_node *node;
638 struct cgraph_edge *edge;
640 for (node = id->node->next_clone; node; node = node->next_clone)
642 edge = cgraph_edge (node, old_node);
644 edge->call_expr = *tp;
651 struct cgraph_edge *edge
652 = cgraph_edge (id->current_node, old_node);
655 cgraph_clone_edge (edge, id->node, *tp);
659 TREE_TYPE (*tp) = remap_type (TREE_TYPE (*tp), id);
661 /* The copied TARGET_EXPR has never been expanded, even if the
662 original node was expanded already. */
663 if (TREE_CODE (*tp) == TARGET_EXPR && TREE_OPERAND (*tp, 3))
665 TREE_OPERAND (*tp, 1) = TREE_OPERAND (*tp, 3);
666 TREE_OPERAND (*tp, 3) = NULL_TREE;
670 /* Keep iterating. */
674 /* Make a copy of the body of FN so that it can be inserted inline in
678 copy_body (inline_data *id)
681 tree fndecl = VARRAY_TOP_TREE (id->fns);
683 if (fndecl == current_function_decl
685 body = cfun->saved_tree;
687 body = DECL_SAVED_TREE (fndecl);
688 walk_tree (&body, copy_body_r, id, NULL);
694 setup_one_parameter (inline_data *id, tree p, tree value, tree fn,
695 tree *init_stmts, tree *vars, bool *gimplify_init_stmts_p)
701 /* If the parameter is never assigned to, we may not need to
702 create a new variable here at all. Instead, we may be able
703 to just use the argument value. */
704 if (TREE_READONLY (p)
705 && !TREE_ADDRESSABLE (p)
706 && value && !TREE_SIDE_EFFECTS (value))
708 /* We can't risk substituting complex expressions. They
709 might contain variables that will be assigned to later.
710 Theoretically, we could check the expression to see if
711 all of the variables that determine its value are
712 read-only, but we don't bother. */
713 if ((TREE_CONSTANT (value) || TREE_READONLY_DECL_P (value))
714 /* We may produce non-gimple trees by adding NOPs or introduce
715 invalid sharing when operand is not really constant.
716 It is not big deal to prohibit constant propagation here as
717 we will constant propagate in DOM1 pass anyway. */
718 && (!lang_hooks.gimple_before_inlining
719 || (is_gimple_min_invariant (value)
720 && TREE_TYPE (value) == TREE_TYPE (p))))
722 /* If this is a declaration, wrap it a NOP_EXPR so that
723 we don't try to put the VALUE on the list of BLOCK_VARS. */
725 value = build1 (NOP_EXPR, TREE_TYPE (value), value);
727 /* If this is a constant, make sure it has the right type. */
728 else if (TREE_TYPE (value) != TREE_TYPE (p))
729 value = fold (build1 (NOP_EXPR, TREE_TYPE (p), value));
731 insert_decl_map (id, p, value);
736 /* Make an equivalent VAR_DECL. */
737 var = copy_decl_for_inlining (p, fn, VARRAY_TREE (id->fns, 0));
739 /* See if the frontend wants to pass this by invisible reference. If
740 so, our new VAR_DECL will have REFERENCE_TYPE, and we need to
741 replace uses of the PARM_DECL with dereferences. */
742 if (TREE_TYPE (var) != TREE_TYPE (p)
743 && POINTER_TYPE_P (TREE_TYPE (var))
744 && TREE_TYPE (TREE_TYPE (var)) == TREE_TYPE (p))
746 insert_decl_map (id, var, var);
747 var_sub = build1 (INDIRECT_REF, TREE_TYPE (p), var);
752 /* Register the VAR_DECL as the equivalent for the PARM_DECL;
753 that way, when the PARM_DECL is encountered, it will be
754 automatically replaced by the VAR_DECL. */
755 insert_decl_map (id, p, var_sub);
757 /* Declare this new variable. */
758 TREE_CHAIN (var) = *vars;
761 /* Make gimplifier happy about this variable. */
762 var->decl.seen_in_bind_expr = lang_hooks.gimple_before_inlining;
764 /* Even if P was TREE_READONLY, the new VAR should not be.
765 In the original code, we would have constructed a
766 temporary, and then the function body would have never
767 changed the value of P. However, now, we will be
768 constructing VAR directly. The constructor body may
769 change its value multiple times as it is being
770 constructed. Therefore, it must not be TREE_READONLY;
771 the back-end assumes that TREE_READONLY variable is
772 assigned to only once. */
773 if (TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (p)))
774 TREE_READONLY (var) = 0;
776 /* Initialize this VAR_DECL from the equivalent argument. Convert
777 the argument to the proper type in case it was promoted. */
780 tree rhs = fold_convert (TREE_TYPE (var), value);
782 if (rhs == error_mark_node)
785 /* We want to use MODIFY_EXPR, not INIT_EXPR here so that we
786 keep our trees in gimple form. */
787 init_stmt = build (MODIFY_EXPR, TREE_TYPE (var), var, rhs);
788 append_to_statement_list (init_stmt, init_stmts);
790 /* If we did not create a gimple value and we did not create a gimple
791 cast of a gimple value, then we will need to gimplify INIT_STMTS
792 at the end. Note that is_gimple_cast only checks the outer
793 tree code, not its operand. Thus the explicit check that it's
794 operand is a gimple value. */
795 if (!is_gimple_val (rhs)
796 && (!is_gimple_cast (rhs)
797 || !is_gimple_val (TREE_OPERAND (rhs, 0))))
798 *gimplify_init_stmts_p = true;
802 /* Generate code to initialize the parameters of the function at the
803 top of the stack in ID from the ARGS (presented as a TREE_LIST). */
806 initialize_inlined_parameters (inline_data *id, tree args, tree static_chain,
807 tree fn, tree bind_expr)
809 tree init_stmts = NULL_TREE;
813 tree vars = NULL_TREE;
814 bool gimplify_init_stmts_p = false;
817 /* Figure out what the parameters are. */
818 parms = DECL_ARGUMENTS (fn);
819 if (fn == current_function_decl)
820 parms = cfun->saved_args;
822 /* Loop through the parameter declarations, replacing each with an
823 equivalent VAR_DECL, appropriately initialized. */
824 for (p = parms, a = args; p;
825 a = a ? TREE_CHAIN (a) : a, p = TREE_CHAIN (p))
831 /* Find the initializer. */
832 value = lang_hooks.tree_inlining.convert_parm_for_inlining
833 (p, a ? TREE_VALUE (a) : NULL_TREE, fn, argnum);
835 setup_one_parameter (id, p, value, fn, &init_stmts, &vars,
836 &gimplify_init_stmts_p);
839 /* Evaluate trailing arguments. */
840 for (; a; a = TREE_CHAIN (a))
842 tree value = TREE_VALUE (a);
843 append_to_statement_list (value, &init_stmts);
846 /* Initialize the static chain. */
847 p = DECL_STRUCT_FUNCTION (fn)->static_chain_decl;
850 /* No static chain? Seems like a bug in tree-nested.c. */
854 setup_one_parameter (id, p, static_chain, fn, &init_stmts, &vars,
855 &gimplify_init_stmts_p);
858 if (gimplify_init_stmts_p && lang_hooks.gimple_before_inlining)
859 gimplify_body (&init_stmts, fn);
861 declare_inline_vars (bind_expr, vars);
865 /* Declare a return variable to replace the RESULT_DECL for the
866 function we are calling. An appropriate decl is returned.
868 ??? Needs documentation of parameters. */
871 declare_return_variable (inline_data *id, tree return_slot_addr, tree *use_p)
873 tree fn = VARRAY_TOP_TREE (id->fns);
874 tree result = DECL_RESULT (fn);
875 int need_return_decl = 1;
878 /* We don't need to do anything for functions that don't return
880 if (!result || VOID_TYPE_P (TREE_TYPE (result)))
886 var = (lang_hooks.tree_inlining.copy_res_decl_for_inlining
887 (result, fn, VARRAY_TREE (id->fns, 0), id->decl_map,
888 &need_return_decl, return_slot_addr));
890 /* Do not have the rest of GCC warn about this variable as it should
891 not be visible to the user. */
892 TREE_NO_WARNING (var) = 1;
894 /* Register the VAR_DECL as the equivalent for the RESULT_DECL; that
895 way, when the RESULT_DECL is encountered, it will be
896 automatically replaced by the VAR_DECL. */
897 insert_decl_map (id, result, var);
899 /* Remember this so we can ignore it in remap_decls. */
902 /* Build the use expr. If the return type of the function was
903 promoted, convert it back to the expected type. */
904 if (return_slot_addr)
905 /* The function returns through an explicit return slot, not a normal
908 else if (TREE_TYPE (var) == TREE_TYPE (TREE_TYPE (fn)))
910 else if (TREE_CODE (var) == INDIRECT_REF)
911 *use_p = build1 (INDIRECT_REF, TREE_TYPE (TREE_TYPE (fn)),
912 TREE_OPERAND (var, 0));
913 else if (TREE_ADDRESSABLE (TREE_TYPE (var)))
916 *use_p = build1 (NOP_EXPR, TREE_TYPE (TREE_TYPE (fn)), var);
918 /* Build the declaration statement if FN does not return an
920 if (need_return_decl)
922 /* If FN does return an aggregate, there's no need to declare the
923 return variable; we're using a variable in our caller's frame. */
928 /* Returns nonzero if a function can be inlined as a tree. */
931 tree_inlinable_function_p (tree fn)
933 return inlinable_function_p (fn);
936 static const char *inline_forbidden_reason;
939 inline_forbidden_p_1 (tree *nodep, int *walk_subtrees ATTRIBUTE_UNUSED,
943 tree fn = (tree) fnp;
946 switch (TREE_CODE (node))
949 /* Refuse to inline alloca call unless user explicitly forced so as
950 this may change program's memory overhead drastically when the
951 function using alloca is called in loop. In GCC present in
952 SPEC2000 inlining into schedule_block cause it to require 2GB of
953 RAM instead of 256MB. */
954 if (alloca_call_p (node)
955 && !lookup_attribute ("always_inline", DECL_ATTRIBUTES (fn)))
957 inline_forbidden_reason
958 = N_("%Jfunction '%F' can never be inlined because it uses "
959 "alloca (override using the always_inline attribute)");
962 t = get_callee_fndecl (node);
966 /* We cannot inline functions that call setjmp. */
967 if (setjmp_call_p (t))
969 inline_forbidden_reason
970 = N_("%Jfunction '%F' can never be inlined because it uses setjmp");
974 if (DECL_BUILT_IN_CLASS (t) == BUILT_IN_NORMAL)
975 switch (DECL_FUNCTION_CODE (t))
977 /* We cannot inline functions that take a variable number of
979 case BUILT_IN_VA_START:
980 case BUILT_IN_STDARG_START:
981 case BUILT_IN_NEXT_ARG:
982 case BUILT_IN_VA_END:
983 inline_forbidden_reason
984 = N_("%Jfunction '%F' can never be inlined because it "
985 "uses variable argument lists");
988 case BUILT_IN_LONGJMP:
989 /* We can't inline functions that call __builtin_longjmp at
990 all. The non-local goto machinery really requires the
991 destination be in a different function. If we allow the
992 function calling __builtin_longjmp to be inlined into the
993 function calling __builtin_setjmp, Things will Go Awry. */
994 inline_forbidden_reason
995 = N_("%Jfunction '%F' can never be inlined because "
996 "it uses setjmp-longjmp exception handling");
999 case BUILT_IN_NONLOCAL_GOTO:
1001 inline_forbidden_reason
1002 = N_("%Jfunction '%F' can never be inlined because "
1003 "it uses non-local goto");
1012 for (t = BIND_EXPR_VARS (node); t ; t = TREE_CHAIN (t))
1014 /* We cannot inline functions that contain other functions. */
1015 if (TREE_CODE (t) == FUNCTION_DECL && DECL_INITIAL (t))
1017 inline_forbidden_reason
1018 = N_("%Jfunction '%F' can never be inlined "
1019 "because it contains a nested function");
1026 t = TREE_OPERAND (node, 0);
1028 /* We will not inline a function which uses computed goto. The
1029 addresses of its local labels, which may be tucked into
1030 global storage, are of course not constant across
1031 instantiations, which causes unexpected behavior. */
1032 if (TREE_CODE (t) != LABEL_DECL)
1034 inline_forbidden_reason
1035 = N_("%Jfunction '%F' can never be inlined "
1036 "because it contains a computed goto");
1042 t = TREE_OPERAND (node, 0);
1043 if (DECL_NONLOCAL (t))
1045 /* We cannot inline a function that receives a non-local goto
1046 because we cannot remap the destination label used in the
1047 function that is performing the non-local goto. */
1048 inline_forbidden_reason
1049 = N_("%Jfunction '%F' can never be inlined "
1050 "because it receives a non-local goto");
1056 /* We cannot inline a function of the form
1058 void F (int i) { struct S { int ar[i]; } s; }
1060 Attempting to do so produces a catch-22.
1061 If walk_tree examines the TYPE_FIELDS chain of RECORD_TYPE/
1062 UNION_TYPE nodes, then it goes into infinite recursion on a
1063 structure containing a pointer to its own type. If it doesn't,
1064 then the type node for S doesn't get adjusted properly when
1065 F is inlined, and we abort in find_function_data. */
1066 for (t = TYPE_FIELDS (node); t; t = TREE_CHAIN (t))
1067 if (variably_modified_type_p (TREE_TYPE (t)))
1069 inline_forbidden_reason
1070 = N_("%Jfunction '%F' can never be inlined "
1071 "because it uses variable sized variables");
1082 /* Return subexpression representing possible alloca call, if any. */
1084 inline_forbidden_p (tree fndecl)
1086 location_t saved_loc = input_location;
1087 tree ret = walk_tree_without_duplicates
1088 (&DECL_SAVED_TREE (fndecl), inline_forbidden_p_1, fndecl);
1089 input_location = saved_loc;
1093 /* Returns nonzero if FN is a function that does not have any
1094 fundamental inline blocking properties. */
1097 inlinable_function_p (tree fn)
1099 bool inlinable = true;
1101 /* If we've already decided this function shouldn't be inlined,
1102 there's no need to check again. */
1103 if (DECL_UNINLINABLE (fn))
1106 /* See if there is any language-specific reason it cannot be
1107 inlined. (It is important that this hook be called early because
1108 in C++ it may result in template instantiation.)
1109 If the function is not inlinable for language-specific reasons,
1110 it is left up to the langhook to explain why. */
1111 inlinable = !lang_hooks.tree_inlining.cannot_inline_tree_fn (&fn);
1113 /* If we don't have the function body available, we can't inline it.
1114 However, this should not be recorded since we also get here for
1115 forward declared inline functions. Therefore, return at once. */
1116 if (!DECL_SAVED_TREE (fn))
1119 /* If we're not inlining at all, then we cannot inline this function. */
1120 else if (!flag_inline_trees)
1123 /* Only try to inline functions if DECL_INLINE is set. This should be
1124 true for all functions declared `inline', and for all other functions
1125 as well with -finline-functions.
1127 Don't think of disregarding DECL_INLINE when flag_inline_trees == 2;
1128 it's the front-end that must set DECL_INLINE in this case, because
1129 dwarf2out loses if a function that does not have DECL_INLINE set is
1130 inlined anyway. That is why we have both DECL_INLINE and
1131 DECL_DECLARED_INLINE_P. */
1132 /* FIXME: When flag_inline_trees dies, the check for flag_unit_at_a_time
1133 here should be redundant. */
1134 else if (!DECL_INLINE (fn) && !flag_unit_at_a_time)
1137 else if (inline_forbidden_p (fn))
1139 /* See if we should warn about uninlinable functions. Previously,
1140 some of these warnings would be issued while trying to expand
1141 the function inline, but that would cause multiple warnings
1142 about functions that would for example call alloca. But since
1143 this a property of the function, just one warning is enough.
1144 As a bonus we can now give more details about the reason why a
1145 function is not inlinable.
1146 We only warn for functions declared `inline' by the user. */
1147 bool do_warning = (warn_inline
1149 && DECL_DECLARED_INLINE_P (fn)
1150 && !DECL_IN_SYSTEM_HEADER (fn));
1152 if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (fn)))
1153 sorry (inline_forbidden_reason, fn, fn);
1154 else if (do_warning)
1155 warning (inline_forbidden_reason, fn, fn);
1160 /* Squirrel away the result so that we don't have to check again. */
1161 DECL_UNINLINABLE (fn) = !inlinable;
1166 /* Used by estimate_num_insns. Estimate number of instructions seen
1167 by given statement. */
1170 estimate_num_insns_1 (tree *tp, int *walk_subtrees, void *data)
1175 if (TYPE_P (x) || DECL_P (x))
1180 /* Assume that constants and references counts nothing. These should
1181 be majorized by amount of operations among them we count later
1182 and are common target of CSE and similar optimizations. */
1183 if (TREE_CODE_CLASS (TREE_CODE (x)) == 'c'
1184 || TREE_CODE_CLASS (TREE_CODE (x)) == 'r')
1186 switch (TREE_CODE (x))
1188 /* Containers have no cost. */
1197 case ARRAY_RANGE_REF:
1199 case EXC_PTR_EXPR: /* ??? */
1200 case FILTER_EXPR: /* ??? */
1203 case LABELED_BLOCK_EXPR:
1204 case WITH_CLEANUP_EXPR:
1206 case VIEW_CONVERT_EXPR:
1210 case REFERENCE_EXPR:
1214 case EXIT_BLOCK_EXPR:
1215 case CASE_LABEL_EXPR:
1218 case EH_FILTER_EXPR:
1219 case STATEMENT_LIST:
1221 case NON_LVALUE_EXPR:
1222 case ENTRY_VALUE_EXPR:
1225 case TRY_CATCH_EXPR:
1226 case TRY_FINALLY_EXPR:
1235 /* We don't account constants for now. Assume that the cost is amortized
1236 by operations that do use them. We may re-consider this decision once
1237 we are able to optimize the tree before estimating it's size and break
1238 out static initializers. */
1239 case IDENTIFIER_NODE:
1248 /* Recognize assignments of large structures and constructors of
1252 x = TREE_OPERAND (x, 0);
1259 size = int_size_in_bytes (TREE_TYPE (x));
1261 if (size < 0 || size > MOVE_MAX_PIECES * MOVE_RATIO)
1264 *count += ((size + MOVE_MAX_PIECES - 1) / MOVE_MAX_PIECES);
1268 /* Assign cost of 1 to usual operations.
1269 ??? We may consider mapping RTL costs to this. */
1276 case FIX_TRUNC_EXPR:
1278 case FIX_FLOOR_EXPR:
1279 case FIX_ROUND_EXPR:
1297 case TRUTH_ANDIF_EXPR:
1298 case TRUTH_ORIF_EXPR:
1299 case TRUTH_AND_EXPR:
1301 case TRUTH_XOR_EXPR:
1302 case TRUTH_NOT_EXPR:
1311 case UNORDERED_EXPR:
1324 case PREDECREMENT_EXPR:
1325 case PREINCREMENT_EXPR:
1326 case POSTDECREMENT_EXPR:
1327 case POSTINCREMENT_EXPR:
1337 /* Few special cases of expensive operations. This is useful
1338 to avoid inlining on functions having too many of these. */
1339 case TRUNC_DIV_EXPR:
1341 case FLOOR_DIV_EXPR:
1342 case ROUND_DIV_EXPR:
1343 case EXACT_DIV_EXPR:
1344 case TRUNC_MOD_EXPR:
1346 case FLOOR_MOD_EXPR:
1347 case ROUND_MOD_EXPR:
1353 tree decl = get_callee_fndecl (x);
1355 if (decl && DECL_BUILT_IN (decl))
1356 switch (DECL_FUNCTION_CODE (decl))
1358 case BUILT_IN_CONSTANT_P:
1361 case BUILT_IN_EXPECT:
1370 /* Abort here se we know we don't miss any nodes. */
1376 /* Estimate number of instructions that will be created by expanding EXPR. */
1379 estimate_num_insns (tree expr)
1382 walk_tree_without_duplicates (&expr, estimate_num_insns_1, &num);
1386 /* If *TP is a CALL_EXPR, replace it with its inline expansion. */
1389 expand_call_inline (tree *tp, int *walk_subtrees, void *data)
1403 tree return_slot_addr;
1404 location_t saved_location;
1405 struct cgraph_edge *edge;
1408 /* See what we've got. */
1409 id = (inline_data *) data;
1412 /* Set input_location here so we get the right instantiation context
1413 if we call instantiate_decl from inlinable_function_p. */
1414 saved_location = input_location;
1415 if (EXPR_HAS_LOCATION (t))
1416 input_location = EXPR_LOCATION (t);
1418 /* Recurse, but letting recursive invocations know that we are
1419 inside the body of a TARGET_EXPR. */
1420 if (TREE_CODE (*tp) == TARGET_EXPR)
1423 int i, len = first_rtl_op (TARGET_EXPR);
1425 /* We're walking our own subtrees. */
1428 /* Actually walk over them. This loop is the body of
1429 walk_trees, omitting the case where the TARGET_EXPR
1430 itself is handled. */
1431 for (i = 0; i < len; ++i)
1434 ++id->in_target_cleanup_p;
1435 walk_tree (&TREE_OPERAND (*tp, i), expand_call_inline, data,
1438 --id->in_target_cleanup_p;
1446 /* Because types were not copied in copy_body, CALL_EXPRs beneath
1447 them should not be expanded. This can happen if the type is a
1448 dynamic array type, for example. */
1451 /* From here on, we're only interested in CALL_EXPRs. */
1452 if (TREE_CODE (t) != CALL_EXPR)
1455 /* First, see if we can figure out what function is being called.
1456 If we cannot, then there is no hope of inlining the function. */
1457 fn = get_callee_fndecl (t);
1461 /* Turn forward declarations into real ones. */
1462 fn = cgraph_node (fn)->decl;
1464 /* If fn is a declaration of a function in a nested scope that was
1465 globally declared inline, we don't set its DECL_INITIAL.
1466 However, we can't blindly follow DECL_ABSTRACT_ORIGIN because the
1467 C++ front-end uses it for cdtors to refer to their internal
1468 declarations, that are not real functions. Fortunately those
1469 don't have trees to be saved, so we can tell by checking their
1471 if (! DECL_INITIAL (fn)
1472 && DECL_ABSTRACT_ORIGIN (fn)
1473 && DECL_SAVED_TREE (DECL_ABSTRACT_ORIGIN (fn)))
1474 fn = DECL_ABSTRACT_ORIGIN (fn);
1476 /* Objective C and fortran still calls tree_rest_of_compilation directly.
1477 Kill this check once this is fixed. */
1478 if (!id->current_node->analyzed)
1481 edge = cgraph_edge (id->current_node, t);
1483 /* Constant propagation on argument done during previous inlining
1484 may create new direct call. Produce an edge for it. */
1487 struct cgraph_node *dest = cgraph_node (fn);
1489 /* We have missing edge in the callgraph. This can happen in one case
1490 where previous inlining turned indirect call into direct call by
1491 constant propagating arguments. In all other cases we hit a bug
1492 (incorrect node sharing is most common reason for missing edges. */
1495 cgraph_create_edge (id->node, dest, t)->inline_failed
1496 = N_("originally indirect function call not considered for inlining");
1500 /* Don't try to inline functions that are not well-suited to
1502 if (!cgraph_inline_p (edge, &reason))
1504 if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (fn)))
1506 sorry ("%Jinlining failed in call to '%F': %s", fn, fn, reason);
1507 sorry ("called from here");
1509 else if (warn_inline && DECL_DECLARED_INLINE_P (fn)
1510 && !DECL_IN_SYSTEM_HEADER (fn)
1513 warning ("%Jinlining failed in call to '%F': %s", fn, fn, reason);
1514 warning ("called from here");
1519 #ifdef ENABLE_CHECKING
1520 if (edge->callee->decl != id->node->decl)
1521 verify_cgraph_node (edge->callee);
1524 if (! lang_hooks.tree_inlining.start_inlining (fn))
1527 /* Build a block containing code to initialize the arguments, the
1528 actual inline expansion of the body, and a label for the return
1529 statements within the function to jump to. The type of the
1530 statement expression is the return type of the function call. */
1532 expr = build (BIND_EXPR, TREE_TYPE (TREE_TYPE (fn)), NULL_TREE,
1533 stmt, make_node (BLOCK));
1534 BLOCK_ABSTRACT_ORIGIN (BIND_EXPR_BLOCK (expr)) = fn;
1536 /* Local declarations will be replaced by their equivalents in this
1539 id->decl_map = splay_tree_new (splay_tree_compare_pointers,
1542 /* Initialize the parameters. */
1543 args = TREE_OPERAND (t, 1);
1544 return_slot_addr = NULL_TREE;
1545 if (CALL_EXPR_HAS_RETURN_SLOT_ADDR (t))
1547 return_slot_addr = TREE_VALUE (args);
1548 args = TREE_CHAIN (args);
1549 TREE_TYPE (expr) = void_type_node;
1552 arg_inits = initialize_inlined_parameters (id, args, TREE_OPERAND (t, 2),
1556 /* Expand any inlined calls in the initializers. Do this before we
1557 push FN on the stack of functions we are inlining; we want to
1558 inline calls to FN that appear in the initializers for the
1561 Note we need to save and restore the saved tree statement iterator
1562 to avoid having it clobbered by expand_calls_inline. */
1563 tree_stmt_iterator save_tsi;
1566 expand_calls_inline (&arg_inits, id);
1569 /* And add them to the tree. */
1570 append_to_statement_list (arg_inits, &BIND_EXPR_BODY (expr));
1573 /* Record the function we are about to inline so that we can avoid
1574 recursing into it. */
1575 VARRAY_PUSH_TREE (id->fns, fn);
1577 /* Record the function we are about to inline if optimize_function
1578 has not been called on it yet and we don't have it in the list. */
1579 if (! DECL_INLINED_FNS (fn))
1583 for (i = VARRAY_ACTIVE_SIZE (id->inlined_fns) - 1; i >= 0; i--)
1584 if (VARRAY_TREE (id->inlined_fns, i) == fn)
1587 VARRAY_PUSH_TREE (id->inlined_fns, fn);
1590 /* Return statements in the function body will be replaced by jumps
1591 to the RET_LABEL. */
1592 id->ret_label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
1593 DECL_ARTIFICIAL (id->ret_label) = 1;
1594 DECL_CONTEXT (id->ret_label) = VARRAY_TREE (id->fns, 0);
1595 insert_decl_map (id, id->ret_label, id->ret_label);
1597 if (! DECL_INITIAL (fn)
1598 || TREE_CODE (DECL_INITIAL (fn)) != BLOCK)
1601 /* Declare the return variable for the function. */
1602 decl = declare_return_variable (id, return_slot_addr, &use_retvar);
1604 declare_inline_vars (expr, decl);
1606 /* After we've initialized the parameters, we insert the body of the
1609 struct cgraph_node *old_node = id->current_node;
1611 id->current_node = edge->callee;
1612 append_to_statement_list (copy_body (id), &BIND_EXPR_BODY (expr));
1613 id->current_node = old_node;
1615 inlined_body = &BIND_EXPR_BODY (expr);
1617 /* After the body of the function comes the RET_LABEL. This must come
1618 before we evaluate the returned value below, because that evaluation
1619 may cause RTL to be generated. */
1620 if (TREE_USED (id->ret_label))
1622 tree label = build1 (LABEL_EXPR, void_type_node, id->ret_label);
1623 append_to_statement_list (label, &BIND_EXPR_BODY (expr));
1626 /* Finally, mention the returned value so that the value of the
1627 statement-expression is the returned value of the function. */
1629 /* Set TREE_TYPE on BIND_EXPR? */
1630 append_to_statement_list_force (use_retvar, &BIND_EXPR_BODY (expr));
1633 splay_tree_delete (id->decl_map);
1636 /* The new expression has side-effects if the old one did. */
1637 TREE_SIDE_EFFECTS (expr) = TREE_SIDE_EFFECTS (t);
1639 /* If we are working with gimple form, then we need to keep the tree
1640 in gimple form. If we are not in gimple form, we can just replace
1641 *tp with the new BIND_EXPR. */
1642 if (lang_hooks.gimple_before_inlining)
1646 /* Keep the new trees in gimple form. */
1647 BIND_EXPR_BODY (expr)
1648 = rationalize_compound_expr (BIND_EXPR_BODY (expr));
1650 /* We want to create a new variable to hold the result of the inlined
1651 body. This new variable needs to be added to the function which we
1652 are inlining into, thus the saving and restoring of
1653 current_function_decl. */
1654 save_decl = current_function_decl;
1655 current_function_decl = id->node->decl;
1656 inline_result = voidify_wrapper_expr (expr, NULL);
1657 current_function_decl = save_decl;
1659 /* If the inlined function returns a result that we care about,
1660 then we're going to need to splice in a MODIFY_EXPR. Otherwise
1661 the call was a standalone statement and we can just replace it
1662 with the BIND_EXPR inline representation of the called function. */
1663 if (TREE_CODE (tsi_stmt (id->tsi)) != CALL_EXPR)
1665 tsi_link_before (&id->tsi, expr, TSI_SAME_STMT);
1666 *tp = inline_result;
1671 /* When we gimplify a function call, we may clear TREE_SIDE_EFFECTS on
1672 the call if it is to a "const" function. Thus the copy of
1673 TREE_SIDE_EFFECTS from the CALL_EXPR to the BIND_EXPR above with
1674 result in TREE_SIDE_EFFECTS not being set for the inlined copy of a
1677 Unfortunately, that is wrong as inlining the function can
1678 create/expose interesting side effects (such as setting of a return
1681 The easiest solution is to simply recalculate TREE_SIDE_EFFECTS for
1682 the toplevel expression. */
1683 recalculate_side_effects (expr);
1688 /* If the value of the new expression is ignored, that's OK. We
1689 don't warn about this for CALL_EXPRs, so we shouldn't warn about
1690 the equivalent inlined version either. */
1691 TREE_USED (*tp) = 1;
1693 /* Update callgraph if needed. */
1694 cgraph_remove_node (edge->callee);
1696 /* Recurse into the body of the just inlined function. */
1697 expand_calls_inline (inlined_body, id);
1698 VARRAY_POP (id->fns);
1700 /* Don't walk into subtrees. We've already handled them above. */
1703 lang_hooks.tree_inlining.end_inlining (fn);
1705 /* Keep iterating. */
1707 input_location = saved_location;
1712 gimple_expand_calls_inline (tree *stmt_p, inline_data *id)
1714 tree stmt = *stmt_p;
1715 enum tree_code code = TREE_CODE (stmt);
1720 case STATEMENT_LIST:
1722 tree_stmt_iterator i;
1725 for (i = tsi_start (stmt); !tsi_end_p (i); )
1728 gimple_expand_calls_inline (tsi_stmt_ptr (i), id);
1731 if (TREE_CODE (new) == STATEMENT_LIST)
1733 tsi_link_before (&i, new, TSI_SAME_STMT);
1743 gimple_expand_calls_inline (&COND_EXPR_THEN (stmt), id);
1744 gimple_expand_calls_inline (&COND_EXPR_ELSE (stmt), id);
1748 gimple_expand_calls_inline (&CATCH_BODY (stmt), id);
1751 case EH_FILTER_EXPR:
1752 gimple_expand_calls_inline (&EH_FILTER_FAILURE (stmt), id);
1755 case TRY_CATCH_EXPR:
1756 case TRY_FINALLY_EXPR:
1757 gimple_expand_calls_inline (&TREE_OPERAND (stmt, 0), id);
1758 gimple_expand_calls_inline (&TREE_OPERAND (stmt, 1), id);
1762 gimple_expand_calls_inline (&BIND_EXPR_BODY (stmt), id);
1766 /* We're gimple. We should have gotten rid of all these. */
1770 stmt_p = &TREE_OPERAND (stmt, 0);
1772 if (!stmt || TREE_CODE (stmt) != MODIFY_EXPR)
1778 stmt_p = &TREE_OPERAND (stmt, 1);
1780 if (TREE_CODE (stmt) != CALL_EXPR)
1786 expand_call_inline (stmt_p, &dummy, id);
1794 /* Walk over the entire tree *TP, replacing CALL_EXPRs with inline
1795 expansions as appropriate. */
1798 expand_calls_inline (tree *tp, inline_data *id)
1800 /* If we are not in gimple form, then we want to walk the tree
1801 recursively as we do not know anything about the structure
1804 if (!lang_hooks.gimple_before_inlining)
1806 walk_tree (tp, expand_call_inline, id, id->tree_pruner);
1810 /* We are in gimple form. We want to stay in gimple form. Walk
1811 the statements, inlining calls in each statement. By walking
1812 the statements, we have enough information to keep the tree
1813 in gimple form as we insert inline bodies. */
1815 gimple_expand_calls_inline (tp, id);
1818 /* Expand calls to inline functions in the body of FN. */
1821 optimize_inline_calls (tree fn)
1826 /* There is no point in performing inlining if errors have already
1827 occurred -- and we might crash if we try to inline invalid
1829 if (errorcount || sorrycount)
1833 memset (&id, 0, sizeof (id));
1835 id.current_node = id.node = cgraph_node (fn);
1836 /* Don't allow recursion into FN. */
1837 VARRAY_TREE_INIT (id.fns, 32, "fns");
1838 VARRAY_PUSH_TREE (id.fns, fn);
1839 /* Or any functions that aren't finished yet. */
1840 prev_fn = NULL_TREE;
1841 if (current_function_decl)
1843 VARRAY_PUSH_TREE (id.fns, current_function_decl);
1844 prev_fn = current_function_decl;
1847 prev_fn = lang_hooks.tree_inlining.add_pending_fn_decls (&id.fns, prev_fn);
1849 /* Create the list of functions this call will inline. */
1850 VARRAY_TREE_INIT (id.inlined_fns, 32, "inlined_fns");
1852 /* Keep track of the low-water mark, i.e., the point where the first
1853 real inlining is represented in ID.FNS. */
1854 id.first_inlined_fn = VARRAY_ACTIVE_SIZE (id.fns);
1856 /* Replace all calls to inline functions with the bodies of those
1858 id.tree_pruner = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
1859 expand_calls_inline (&DECL_SAVED_TREE (fn), &id);
1862 htab_delete (id.tree_pruner);
1863 if (DECL_LANG_SPECIFIC (fn))
1865 tree ifn = make_tree_vec (VARRAY_ACTIVE_SIZE (id.inlined_fns));
1867 if (VARRAY_ACTIVE_SIZE (id.inlined_fns))
1868 memcpy (&TREE_VEC_ELT (ifn, 0), &VARRAY_TREE (id.inlined_fns, 0),
1869 VARRAY_ACTIVE_SIZE (id.inlined_fns) * sizeof (tree));
1870 DECL_INLINED_FNS (fn) = ifn;
1873 #ifdef ENABLE_CHECKING
1875 struct cgraph_edge *e;
1877 verify_cgraph_node (id.node);
1879 /* Double check that we inlined everything we are supposed to inline. */
1880 for (e = id.node->callees; e; e = e->next_callee)
1881 if (!e->inline_failed)
1887 /* FN is a function that has a complete body, and CLONE is a function whose
1888 body is to be set to a copy of FN, mapping argument declarations according
1889 to the ARG_MAP splay_tree. */
1892 clone_body (tree clone, tree fn, void *arg_map)
1896 /* Clone the body, as if we were making an inline call. But, remap the
1897 parameters in the callee to the parameters of caller. If there's an
1898 in-charge parameter, map it to an appropriate constant. */
1899 memset (&id, 0, sizeof (id));
1900 VARRAY_TREE_INIT (id.fns, 2, "fns");
1901 VARRAY_PUSH_TREE (id.fns, clone);
1902 VARRAY_PUSH_TREE (id.fns, fn);
1903 id.decl_map = (splay_tree)arg_map;
1905 /* Cloning is treated slightly differently from inlining. Set
1906 CLONING_P so that it's clear which operation we're performing. */
1907 id.cloning_p = true;
1909 /* Actually copy the body. */
1910 append_to_statement_list_force (copy_body (&id), &DECL_SAVED_TREE (clone));
1913 /* Save duplicate of body in FN. MAP is used to pass around splay tree
1914 used to update arguments in restore_body. */
1916 save_body (tree fn, tree *arg_copy)
1921 memset (&id, 0, sizeof (id));
1922 VARRAY_TREE_INIT (id.fns, 1, "fns");
1923 VARRAY_PUSH_TREE (id.fns, fn);
1924 id.node = cgraph_node (fn);
1926 id.decl_map = splay_tree_new (splay_tree_compare_pointers, NULL, NULL);
1927 *arg_copy = DECL_ARGUMENTS (fn);
1929 for (parg = arg_copy; *parg; parg = &TREE_CHAIN (*parg))
1931 tree new = copy_node (*parg);
1933 lang_hooks.dup_lang_specific_decl (new);
1934 DECL_ABSTRACT_ORIGIN (new) = DECL_ORIGIN (*parg);
1935 insert_decl_map (&id, *parg, new);
1936 TREE_CHAIN (new) = TREE_CHAIN (*parg);
1940 insert_decl_map (&id, DECL_RESULT (fn), DECL_RESULT (fn));
1942 /* Actually copy the body. */
1943 body = copy_body (&id);
1946 splay_tree_delete (id.decl_map);
1950 /* Apply FUNC to all the sub-trees of TP in a pre-order traversal. FUNC is
1951 called with the DATA and the address of each sub-tree. If FUNC returns a
1952 non-NULL value, the traversal is aborted, and the value returned by FUNC
1953 is returned. If HTAB is non-NULL it is used to record the nodes visited,
1954 and to avoid visiting a node more than once. */
1957 walk_tree (tree *tp, walk_tree_fn func, void *data, void *htab_)
1959 htab_t htab = (htab_t) htab_;
1960 enum tree_code code;
1964 #define WALK_SUBTREE(NODE) \
1967 result = walk_tree (&(NODE), func, data, htab); \
1973 #define WALK_SUBTREE_TAIL(NODE) \
1977 goto tail_recurse; \
1982 /* Skip empty subtrees. */
1990 /* Don't walk the same tree twice, if the user has requested
1991 that we avoid doing so. */
1992 slot = htab_find_slot (htab, *tp, INSERT);
1998 /* Call the function. */
2000 result = (*func) (tp, &walk_subtrees, data);
2002 /* If we found something, return it. */
2006 code = TREE_CODE (*tp);
2008 /* Even if we didn't, FUNC may have decided that there was nothing
2009 interesting below this point in the tree. */
2012 if (code == TREE_LIST)
2013 /* But we still need to check our siblings. */
2014 WALK_SUBTREE_TAIL (TREE_CHAIN (*tp));
2019 result = lang_hooks.tree_inlining.walk_subtrees (tp, &walk_subtrees, func,
2021 if (result || ! walk_subtrees)
2024 if (code != EXIT_BLOCK_EXPR
2025 && code != SAVE_EXPR
2026 && code != BIND_EXPR
2027 && IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (code)))
2031 /* Walk over all the sub-trees of this operand. */
2032 len = first_rtl_op (code);
2033 /* TARGET_EXPRs are peculiar: operands 1 and 3 can be the same.
2034 But, we only want to walk once. */
2035 if (code == TARGET_EXPR
2036 && TREE_OPERAND (*tp, 3) == TREE_OPERAND (*tp, 1))
2039 /* Go through the subtrees. We need to do this in forward order so
2040 that the scope of a FOR_EXPR is handled properly. */
2041 #ifdef DEBUG_WALK_TREE
2042 for (i = 0; i < len; ++i)
2043 WALK_SUBTREE (TREE_OPERAND (*tp, i));
2045 for (i = 0; i < len - 1; ++i)
2046 WALK_SUBTREE (TREE_OPERAND (*tp, i));
2050 /* The common case is that we may tail recurse here. */
2051 if (code != BIND_EXPR
2052 && !TREE_CHAIN (*tp))
2053 WALK_SUBTREE_TAIL (TREE_OPERAND (*tp, len - 1));
2055 WALK_SUBTREE (TREE_OPERAND (*tp, len - 1));
2060 /* Look inside the sizes of decls, but we don't ever use the values for
2061 FIELD_DECL and RESULT_DECL, so ignore them. */
2062 else if (TREE_CODE_CLASS (code) == 'd'
2063 && code != FIELD_DECL && code != RESULT_DECL)
2065 WALK_SUBTREE (DECL_SIZE (*tp));
2066 WALK_SUBTREE (DECL_SIZE_UNIT (*tp));
2067 WALK_SUBTREE_TAIL (TREE_TYPE (*tp));
2071 if (TREE_CODE_CLASS (code) == 't')
2073 WALK_SUBTREE (TYPE_SIZE (*tp));
2074 WALK_SUBTREE (TYPE_SIZE_UNIT (*tp));
2075 /* Also examine various special fields, below. */
2078 /* Not one of the easy cases. We must explicitly go through the
2083 case IDENTIFIER_NODE:
2091 case PLACEHOLDER_EXPR:
2095 /* None of thse have subtrees other than those already walked
2100 case REFERENCE_TYPE:
2102 WALK_SUBTREE_TAIL (TREE_TYPE (*tp));
2106 WALK_SUBTREE (TREE_VALUE (*tp));
2107 WALK_SUBTREE_TAIL (TREE_CHAIN (*tp));
2112 int len = TREE_VEC_LENGTH (*tp);
2117 /* Walk all elements but the first. */
2119 WALK_SUBTREE (TREE_VEC_ELT (*tp, len));
2121 /* Now walk the first one as a tail call. */
2122 WALK_SUBTREE_TAIL (TREE_VEC_ELT (*tp, 0));
2126 WALK_SUBTREE (TREE_REALPART (*tp));
2127 WALK_SUBTREE_TAIL (TREE_IMAGPART (*tp));
2130 WALK_SUBTREE_TAIL (CONSTRUCTOR_ELTS (*tp));
2133 WALK_SUBTREE (TYPE_METHOD_BASETYPE (*tp));
2138 WALK_SUBTREE (TREE_TYPE (*tp));
2140 tree arg = TYPE_ARG_TYPES (*tp);
2142 /* We never want to walk into default arguments. */
2143 for (; arg; arg = TREE_CHAIN (arg))
2144 WALK_SUBTREE (TREE_VALUE (arg));
2150 case QUAL_UNION_TYPE:
2154 for (field = TYPE_FIELDS (*tp); field; field = TREE_CHAIN (field))
2156 /* We would like to look at the type of the field, but we
2157 can easily get infinite recursion. So assume it's
2158 pointed to elsewhere in the tree. Also, ignore things that
2160 if (TREE_CODE (field) != FIELD_DECL)
2163 WALK_SUBTREE (DECL_FIELD_OFFSET (field));
2164 WALK_SUBTREE (DECL_SIZE (field));
2165 WALK_SUBTREE (DECL_SIZE_UNIT (field));
2166 if (code == QUAL_UNION_TYPE)
2167 WALK_SUBTREE (DECL_QUALIFIER (field));
2173 /* Don't follow this nodes's type if a pointer for fear that we'll
2174 have infinite recursion. Those types are uninteresting anyway. */
2175 if (!POINTER_TYPE_P (TREE_TYPE (*tp))
2176 && TREE_CODE (TREE_TYPE (*tp)) != OFFSET_TYPE)
2177 WALK_SUBTREE (TREE_TYPE (*tp));
2178 WALK_SUBTREE_TAIL (TYPE_DOMAIN (*tp));
2185 WALK_SUBTREE (TYPE_MIN_VALUE (*tp));
2186 WALK_SUBTREE_TAIL (TYPE_MAX_VALUE (*tp));
2189 WALK_SUBTREE (TREE_TYPE (*tp));
2190 WALK_SUBTREE_TAIL (TYPE_OFFSET_BASETYPE (*tp));
2192 case EXIT_BLOCK_EXPR:
2193 WALK_SUBTREE_TAIL (TREE_OPERAND (*tp, 1));
2196 WALK_SUBTREE_TAIL (TREE_OPERAND (*tp, 0));
2201 for (decl = BIND_EXPR_VARS (*tp); decl; decl = TREE_CHAIN (decl))
2203 /* Walk the DECL_INITIAL and DECL_SIZE. We don't want to walk
2204 into declarations that are just mentioned, rather than
2205 declared; they don't really belong to this part of the tree.
2206 And, we can see cycles: the initializer for a declaration
2207 can refer to the declaration itself. */
2208 WALK_SUBTREE (DECL_INITIAL (decl));
2209 WALK_SUBTREE (DECL_SIZE (decl));
2210 WALK_SUBTREE (DECL_SIZE_UNIT (decl));
2211 WALK_SUBTREE (TREE_TYPE (decl));
2213 WALK_SUBTREE_TAIL (BIND_EXPR_BODY (*tp));
2216 case STATEMENT_LIST:
2218 tree_stmt_iterator i;
2219 for (i = tsi_start (*tp); !tsi_end_p (i); tsi_next (&i))
2220 WALK_SUBTREE (*tsi_stmt_ptr (i));
2225 /* ??? This could be a language-defined node. We really should make
2226 a hook for it, but right now just ignore it. */
2231 /* We didn't find what we were looking for. */
2235 #undef WALK_SUBTREE_TAIL
2238 /* Like walk_tree, but does not walk duplicate nodes more than once. */
2241 walk_tree_without_duplicates (tree *tp, walk_tree_fn func, void *data)
2246 htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
2247 result = walk_tree (tp, func, data, htab);
2252 /* Passed to walk_tree. Copies the node pointed to, if appropriate. */
2255 copy_tree_r (tree *tp, int *walk_subtrees, void *data ATTRIBUTE_UNUSED)
2257 enum tree_code code = TREE_CODE (*tp);
2259 /* We make copies of most nodes. */
2260 if (IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (code))
2261 || TREE_CODE_CLASS (code) == 'c'
2262 || code == TREE_LIST
2264 || code == TYPE_DECL)
2266 /* Because the chain gets clobbered when we make a copy, we save it
2268 tree chain = TREE_CHAIN (*tp);
2271 /* Copy the node. */
2272 new = copy_node (*tp);
2274 /* Propagate mudflap marked-ness. */
2275 if (flag_mudflap && mf_marked_p (*tp))
2280 /* Now, restore the chain, if appropriate. That will cause
2281 walk_tree to walk into the chain as well. */
2282 if (code == PARM_DECL || code == TREE_LIST)
2283 TREE_CHAIN (*tp) = chain;
2285 /* For now, we don't update BLOCKs when we make copies. So, we
2286 have to nullify all BIND_EXPRs. */
2287 if (TREE_CODE (*tp) == BIND_EXPR)
2288 BIND_EXPR_BLOCK (*tp) = NULL_TREE;
2291 else if (TREE_CODE_CLASS (code) == 't')
2293 else if (TREE_CODE_CLASS (code) == 'd')
2295 else if (code == STATEMENT_LIST)
2301 /* The SAVE_EXPR pointed to by TP is being copied. If ST contains
2302 information indicating to what new SAVE_EXPR this one should be mapped,
2303 use that one. Otherwise, create a new node and enter it in ST. FN is the
2304 function into which the copy will be placed. */
2307 remap_save_expr (tree *tp, void *st_, tree fn, int *walk_subtrees)
2309 splay_tree st = (splay_tree) st_;
2313 /* See if we already encountered this SAVE_EXPR. */
2314 n = splay_tree_lookup (st, (splay_tree_key) *tp);
2316 /* If we didn't already remap this SAVE_EXPR, do so now. */
2319 t = copy_node (*tp);
2321 /* The SAVE_EXPR is now part of the function into which we
2322 are inlining this body. */
2323 SAVE_EXPR_CONTEXT (t) = fn;
2324 /* And we haven't evaluated it yet. */
2325 SAVE_EXPR_RTL (t) = NULL_RTX;
2326 /* Remember this SAVE_EXPR. */
2327 splay_tree_insert (st, (splay_tree_key) *tp, (splay_tree_value) t);
2328 /* Make sure we don't remap an already-remapped SAVE_EXPR. */
2329 splay_tree_insert (st, (splay_tree_key) t, (splay_tree_value) t);
2333 /* We've already walked into this SAVE_EXPR; don't do it again. */
2335 t = (tree) n->value;
2338 /* Replace this SAVE_EXPR with the copy. */
2342 /* Called via walk_tree. If *TP points to a DECL_STMT for a local label,
2343 copies the declaration and enters it in the splay_tree in DATA (which is
2344 really an `inline_data *'). */
2347 mark_local_for_remap_r (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
2351 inline_data *id = (inline_data *) data;
2354 /* Don't walk into types. */
2361 if (TREE_CODE (t) == LABEL_EXPR)
2362 decl = TREE_OPERAND (t, 0);
2364 /* We don't need to handle anything else ahead of time. */
2372 copy = copy_decl_for_inlining (decl,
2373 DECL_CONTEXT (decl),
2374 DECL_CONTEXT (decl));
2376 /* Remember the copy. */
2377 insert_decl_map (id, decl, copy);
2383 /* Called via walk_tree when an expression is unsaved. Using the
2384 splay_tree pointed to by ST (which is really a `splay_tree'),
2385 remaps all local declarations to appropriate replacements. */
2388 unsave_r (tree *tp, int *walk_subtrees, void *data)
2390 inline_data *id = (inline_data *) data;
2391 splay_tree st = id->decl_map;
2394 /* Only a local declaration (variable or label). */
2395 if ((TREE_CODE (*tp) == VAR_DECL && !TREE_STATIC (*tp))
2396 || TREE_CODE (*tp) == LABEL_DECL)
2398 /* Lookup the declaration. */
2399 n = splay_tree_lookup (st, (splay_tree_key) *tp);
2401 /* If it's there, remap it. */
2403 *tp = (tree) n->value;
2406 else if (TREE_CODE (*tp) == STATEMENT_LIST)
2407 copy_statement_list (tp);
2408 else if (TREE_CODE (*tp) == BIND_EXPR)
2409 copy_bind_expr (tp, walk_subtrees, id);
2410 else if (TREE_CODE (*tp) == SAVE_EXPR)
2411 remap_save_expr (tp, st, current_function_decl, walk_subtrees);
2414 copy_tree_r (tp, walk_subtrees, NULL);
2416 /* Do whatever unsaving is required. */
2417 unsave_expr_1 (*tp);
2420 /* Keep iterating. */
2424 /* Default lang hook for "unsave_expr_now". Copies everything in EXPR and
2425 replaces variables, labels and SAVE_EXPRs local to EXPR. */
2428 lhd_unsave_expr_now (tree expr)
2432 /* There's nothing to do for NULL_TREE. */
2437 memset (&id, 0, sizeof (id));
2438 VARRAY_TREE_INIT (id.fns, 1, "fns");
2439 VARRAY_PUSH_TREE (id.fns, current_function_decl);
2440 id.decl_map = splay_tree_new (splay_tree_compare_pointers, NULL, NULL);
2442 /* Walk the tree once to find local labels. */
2443 walk_tree_without_duplicates (&expr, mark_local_for_remap_r, &id);
2445 /* Walk the tree again, copying, remapping, and unsaving. */
2446 walk_tree (&expr, unsave_r, &id, NULL);
2449 splay_tree_delete (id.decl_map);
2454 /* Allow someone to determine if SEARCH is a child of TOP from gdb. */
2457 debug_find_tree_1 (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED, void *data)
2466 debug_find_tree (tree top, tree search)
2468 return walk_tree_without_duplicates (&top, debug_find_tree_1, search) != 0;
2471 /* Declare the variables created by the inliner. Add all the variables in
2472 VARS to BIND_EXPR. */
2475 declare_inline_vars (tree bind_expr, tree vars)
2477 if (lang_hooks.gimple_before_inlining)
2481 for (t = vars; t; t = TREE_CHAIN (t))
2482 vars->decl.seen_in_bind_expr = 1;
2485 add_var_to_bind_expr (bind_expr, vars);