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 "pointer-set.h"
39 #include "splay-tree.h"
40 #include "langhooks.h"
43 #include "tree-mudflap.h"
45 #include "diagnostic.h"
47 /* I'm not real happy about this, but we need to handle gimple and
49 #include "tree-iterator.h"
50 #include "tree-gimple.h"
52 /* 0 if we should not perform inlining.
53 1 if we should expand functions calls inline at the tree level.
54 2 if we should consider *all* functions to be inline
57 int flag_inline_trees = 0;
61 o In order to make inlining-on-trees work, we pessimized
62 function-local static constants. In particular, they are now
63 always output, even when not addressed. Fix this by treating
64 function-local static constants just like global static
65 constants; the back-end already knows not to output them if they
68 o Provide heuristics to clamp inlining of recursive template
71 /* Data required for function inlining. */
73 typedef struct inline_data
75 /* A stack of the functions we are inlining. For example, if we are
76 compiling `f', which calls `g', which calls `h', and we are
77 inlining the body of `h', the stack will contain, `h', followed
78 by `g', followed by `f'. The first few elements of the stack may
79 contain other functions that we know we should not recurse into,
80 even though they are not directly being inlined. */
82 /* The index of the first element of FNS that really represents an
84 unsigned first_inlined_fn;
85 /* The label to jump to when a return statement is encountered. If
86 this value is NULL, then return statements will simply be
87 remapped as return statements, rather than as jumps. */
89 /* The VAR_DECL for the return value. */
91 /* The map from local declarations in the inlined function to
92 equivalents in the function into which it is being inlined. */
94 /* Nonzero if we are currently within the cleanup for a
96 int in_target_cleanup_p;
97 /* A list of the functions current function has inlined. */
98 varray_type inlined_fns;
99 /* We use the same mechanism to build clones that we do to perform
100 inlining. However, there are a few places where we need to
101 distinguish between those two situations. This flag is true if
102 we are cloning, rather than inlining. */
104 /* Similarly for saving function body. */
106 /* Hash table used to prevent walk_tree from visiting the same node
107 umpteen million times. */
109 /* Callgraph node of function we are inlining into. */
110 struct cgraph_node *node;
111 /* Callgraph node of currently inlined function. */
112 struct cgraph_node *current_node;
113 /* Statement iterator. We need this so we can keep the tree in
114 gimple form when we insert the inlined function. It is not
115 used when we are not dealing with gimple trees. */
116 tree_stmt_iterator tsi;
121 /* The approximate number of instructions per statement. This number
122 need not be particularly accurate; it is used only to make
123 decisions about when a function is too big to inline. */
124 #define INSNS_PER_STMT (10)
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 void unsave_expr_1 (tree);
140 static tree unsave_r (tree *, int *, void *);
141 static void declare_inline_vars (tree bind_expr, tree vars);
142 static void remap_save_expr (tree *, void *, int *);
144 /* Insert a tree->tree mapping for ID. Despite the name suggests
145 that the trees should be variables, it is used for more than that. */
148 insert_decl_map (inline_data *id, tree key, tree value)
150 splay_tree_insert (id->decl_map, (splay_tree_key) key,
151 (splay_tree_value) value);
153 /* Always insert an identity map as well. If we see this same new
154 node again, we won't want to duplicate it a second time. */
156 splay_tree_insert (id->decl_map, (splay_tree_key) value,
157 (splay_tree_value) value);
160 /* Remap DECL during the copying of the BLOCK tree for the function.
161 We are only called to remap local variables in the current function. */
164 remap_decl (tree decl, inline_data *id)
166 splay_tree_node n = splay_tree_lookup (id->decl_map, (splay_tree_key) decl);
167 tree fn = VARRAY_TOP_TREE (id->fns);
169 /* See if we have remapped this declaration. If we didn't already have an
170 equivalent for this declaration, create one now. */
173 /* Make a copy of the variable or label. */
174 tree t = copy_decl_for_inlining (decl, fn, VARRAY_TREE (id->fns, 0));
176 /* Remap types, if necessary. */
177 TREE_TYPE (t) = remap_type (TREE_TYPE (t), id);
178 if (TREE_CODE (t) == TYPE_DECL)
179 DECL_ORIGINAL_TYPE (t) = remap_type (DECL_ORIGINAL_TYPE (t), id);
180 else if (TREE_CODE (t) == PARM_DECL)
181 DECL_ARG_TYPE_AS_WRITTEN (t)
182 = remap_type (DECL_ARG_TYPE_AS_WRITTEN (t), id);
184 /* Remap sizes as necessary. */
185 walk_tree (&DECL_SIZE (t), copy_body_r, id, NULL);
186 walk_tree (&DECL_SIZE_UNIT (t), copy_body_r, id, NULL);
188 /* If fields, do likewise for offset and qualifier. */
189 if (TREE_CODE (t) == FIELD_DECL)
191 walk_tree (&DECL_FIELD_OFFSET (t), copy_body_r, id, NULL);
192 if (TREE_CODE (DECL_CONTEXT (t)) == QUAL_UNION_TYPE)
193 walk_tree (&DECL_QUALIFIER (t), copy_body_r, id, NULL);
197 /* FIXME handle anon aggrs. */
198 if (! DECL_NAME (t) && TREE_TYPE (t)
199 && lang_hooks.tree_inlining.anon_aggr_type_p (TREE_TYPE (t)))
201 /* For a VAR_DECL of anonymous type, we must also copy the
202 member VAR_DECLS here and rechain the DECL_ANON_UNION_ELEMS. */
206 for (src = DECL_ANON_UNION_ELEMS (t); src;
207 src = TREE_CHAIN (src))
209 tree member = remap_decl (TREE_VALUE (src), id);
211 gcc_assert (!TREE_PURPOSE (src));
212 members = tree_cons (NULL, member, members);
214 DECL_ANON_UNION_ELEMS (t) = nreverse (members);
218 /* Remember it, so that if we encounter this local entity
219 again we can reuse this copy. */
220 insert_decl_map (id, decl, t);
224 return unshare_expr ((tree) n->value);
228 remap_type (tree type, inline_data *id)
230 splay_tree_node node;
236 /* See if we have remapped this type. */
237 node = splay_tree_lookup (id->decl_map, (splay_tree_key) type);
239 return (tree) node->value;
241 /* The type only needs remapping if it's variably modified by a variable
242 in the function we are inlining. */
243 if (! variably_modified_type_p (type, VARRAY_TOP_TREE (id->fns)))
245 insert_decl_map (id, type, type);
249 /* We do need a copy. build and register it now. If this is a pointer or
250 reference type, remap the designated type and make a new pointer or
252 if (TREE_CODE (type) == POINTER_TYPE)
254 new = build_pointer_type_for_mode (remap_type (TREE_TYPE (type), id),
256 TYPE_REF_CAN_ALIAS_ALL (type));
257 insert_decl_map (id, type, new);
260 else if (TREE_CODE (type) == REFERENCE_TYPE)
262 new = build_reference_type_for_mode (remap_type (TREE_TYPE (type), id),
264 TYPE_REF_CAN_ALIAS_ALL (type));
265 insert_decl_map (id, type, new);
269 new = copy_node (type);
271 insert_decl_map (id, type, new);
273 /* This is a new type, not a copy of an old type. Need to reassociate
274 variants. We can handle everything except the main variant lazily. */
275 t = TYPE_MAIN_VARIANT (type);
278 t = remap_type (t, id);
279 TYPE_MAIN_VARIANT (new) = t;
280 TYPE_NEXT_VARIANT (new) = TYPE_MAIN_VARIANT (t);
281 TYPE_NEXT_VARIANT (t) = new;
285 TYPE_MAIN_VARIANT (new) = new;
286 TYPE_NEXT_VARIANT (new) = NULL;
289 /* Lazily create pointer and reference types. */
290 TYPE_POINTER_TO (new) = NULL;
291 TYPE_REFERENCE_TO (new) = NULL;
293 switch (TREE_CODE (new))
300 t = TYPE_MIN_VALUE (new);
301 if (t && TREE_CODE (t) != INTEGER_CST)
302 walk_tree (&TYPE_MIN_VALUE (new), copy_body_r, id, NULL);
304 t = TYPE_MAX_VALUE (new);
305 if (t && TREE_CODE (t) != INTEGER_CST)
306 walk_tree (&TYPE_MAX_VALUE (new), copy_body_r, id, NULL);
310 TREE_TYPE (new) = remap_type (TREE_TYPE (new), id);
311 walk_tree (&TYPE_ARG_TYPES (new), copy_body_r, id, NULL);
315 TREE_TYPE (new) = remap_type (TREE_TYPE (new), id);
316 TYPE_DOMAIN (new) = remap_type (TYPE_DOMAIN (new), id);
321 case QUAL_UNION_TYPE:
322 walk_tree (&TYPE_FIELDS (new), copy_body_r, id, NULL);
328 /* Shouldn't have been thought variable sized. */
332 walk_tree (&TYPE_SIZE (new), copy_body_r, id, NULL);
333 walk_tree (&TYPE_SIZE_UNIT (new), copy_body_r, id, NULL);
339 remap_decls (tree decls, inline_data *id)
342 tree new_decls = NULL_TREE;
344 /* Remap its variables. */
345 for (old_var = decls; old_var; old_var = TREE_CHAIN (old_var))
349 /* Remap the variable. */
350 new_var = remap_decl (old_var, id);
352 /* If we didn't remap this variable, so we can't mess with its
353 TREE_CHAIN. If we remapped this variable to the return slot, it's
354 already declared somewhere else, so don't declare it here. */
355 if (!new_var || new_var == id->retvar)
359 gcc_assert (DECL_P (new_var));
360 TREE_CHAIN (new_var) = new_decls;
365 return nreverse (new_decls);
368 /* Copy the BLOCK to contain remapped versions of the variables
369 therein. And hook the new block into the block-tree. */
372 remap_block (tree *block, inline_data *id)
378 /* Make the new block. */
380 new_block = make_node (BLOCK);
381 TREE_USED (new_block) = TREE_USED (old_block);
382 BLOCK_ABSTRACT_ORIGIN (new_block) = old_block;
385 /* Remap its variables. */
386 BLOCK_VARS (new_block) = remap_decls (BLOCK_VARS (old_block), id);
388 fn = VARRAY_TREE (id->fns, 0);
390 /* FIXME! It shouldn't be so hard to manage blocks. Rebuilding them in
391 rest_of_compilation is a good start. */
393 /* We're building a clone; DECL_INITIAL is still
394 error_mark_node, and current_binding_level is the parm
396 lang_hooks.decls.insert_block (new_block);
399 /* Attach this new block after the DECL_INITIAL block for the
400 function into which this block is being inlined. In
401 rest_of_compilation we will straighten out the BLOCK tree. */
403 if (DECL_INITIAL (fn))
404 first_block = &BLOCK_CHAIN (DECL_INITIAL (fn));
406 first_block = &DECL_INITIAL (fn);
407 BLOCK_CHAIN (new_block) = *first_block;
408 *first_block = new_block;
411 /* Remember the remapped block. */
412 insert_decl_map (id, old_block, new_block);
416 copy_statement_list (tree *tp)
418 tree_stmt_iterator oi, ni;
421 new = alloc_stmt_list ();
422 ni = tsi_start (new);
423 oi = tsi_start (*tp);
426 for (; !tsi_end_p (oi); tsi_next (&oi))
427 tsi_link_after (&ni, tsi_stmt (oi), TSI_NEW_STMT);
431 copy_bind_expr (tree *tp, int *walk_subtrees, inline_data *id)
433 tree block = BIND_EXPR_BLOCK (*tp);
434 /* Copy (and replace) the statement. */
435 copy_tree_r (tp, walk_subtrees, NULL);
438 remap_block (&block, id);
439 BIND_EXPR_BLOCK (*tp) = block;
442 if (BIND_EXPR_VARS (*tp))
443 /* This will remap a lot of the same decls again, but this should be
445 BIND_EXPR_VARS (*tp) = remap_decls (BIND_EXPR_VARS (*tp), id);
448 /* Called from copy_body via walk_tree. DATA is really an `inline_data *'. */
451 copy_body_r (tree *tp, int *walk_subtrees, void *data)
453 inline_data *id = (inline_data *) data;
454 tree fn = VARRAY_TOP_TREE (id->fns);
457 /* All automatic variables should have a DECL_CONTEXT indicating
458 what function they come from. */
459 if ((TREE_CODE (*tp) == VAR_DECL || TREE_CODE (*tp) == LABEL_DECL)
460 && DECL_NAMESPACE_SCOPE_P (*tp))
461 gcc_assert (DECL_EXTERNAL (*tp) || TREE_STATIC (*tp));
464 /* If this is a RETURN_EXPR, change it into a MODIFY_EXPR and a
465 GOTO_EXPR with the RET_LABEL as its target. */
466 if (TREE_CODE (*tp) == RETURN_EXPR && id->ret_label)
468 tree return_stmt = *tp;
471 /* Build the GOTO_EXPR. */
472 tree assignment = TREE_OPERAND (return_stmt, 0);
473 goto_stmt = build1 (GOTO_EXPR, void_type_node, id->ret_label);
474 TREE_USED (id->ret_label) = 1;
476 /* If we're returning something, just turn that into an
477 assignment into the equivalent of the original
481 /* Do not create a statement containing a naked RESULT_DECL. */
482 if (TREE_CODE (assignment) == RESULT_DECL)
483 gimplify_stmt (&assignment);
485 *tp = build (BIND_EXPR, void_type_node, NULL, NULL, NULL);
486 append_to_statement_list (assignment, &BIND_EXPR_BODY (*tp));
487 append_to_statement_list (goto_stmt, &BIND_EXPR_BODY (*tp));
489 /* If we're not returning anything just do the jump. */
493 /* Local variables and labels need to be replaced by equivalent
494 variables. We don't want to copy static variables; there's only
495 one of those, no matter how many times we inline the containing
496 function. Similarly for globals from an outer function. */
497 else if (lang_hooks.tree_inlining.auto_var_in_fn_p (*tp, fn))
501 /* Remap the declaration. */
502 new_decl = remap_decl (*tp, id);
503 gcc_assert (new_decl);
504 /* Replace this variable with the copy. */
505 STRIP_TYPE_NOPS (new_decl);
508 else if (TREE_CODE (*tp) == STATEMENT_LIST)
509 copy_statement_list (tp);
510 else if (TREE_CODE (*tp) == SAVE_EXPR)
511 remap_save_expr (tp, id->decl_map, walk_subtrees);
512 else if (TREE_CODE (*tp) == BIND_EXPR)
513 copy_bind_expr (tp, walk_subtrees, id);
514 /* Types may need remapping as well. */
515 else if (TYPE_P (*tp))
516 *tp = remap_type (*tp, id);
518 /* If this is a constant, we have to copy the node iff the type will be
519 remapped. copy_tree_r will not copy a constant. */
520 else if (TREE_CODE_CLASS (TREE_CODE (*tp)) == tcc_constant)
522 tree new_type = remap_type (TREE_TYPE (*tp), id);
524 if (new_type == TREE_TYPE (*tp))
527 else if (TREE_CODE (*tp) == INTEGER_CST)
528 *tp = build_int_cst_wide (new_type, TREE_INT_CST_LOW (*tp),
529 TREE_INT_CST_HIGH (*tp));
532 *tp = copy_node (*tp);
533 TREE_TYPE (*tp) = new_type;
537 /* Otherwise, just copy the node. Note that copy_tree_r already
538 knows not to copy VAR_DECLs, etc., so this is safe. */
543 if (TREE_CODE (*tp) == MODIFY_EXPR
544 && TREE_OPERAND (*tp, 0) == TREE_OPERAND (*tp, 1)
545 && (lang_hooks.tree_inlining.auto_var_in_fn_p
546 (TREE_OPERAND (*tp, 0), fn)))
548 /* Some assignments VAR = VAR; don't generate any rtl code
549 and thus don't count as variable modification. Avoid
550 keeping bogosities like 0 = 0. */
551 tree decl = TREE_OPERAND (*tp, 0), value;
554 n = splay_tree_lookup (id->decl_map, (splay_tree_key) decl);
557 value = (tree) n->value;
558 STRIP_TYPE_NOPS (value);
559 if (TREE_CONSTANT (value) || TREE_READONLY_DECL_P (value))
561 *tp = build_empty_stmt ();
562 return copy_body_r (tp, walk_subtrees, data);
566 else if (TREE_CODE (*tp) == INDIRECT_REF)
568 /* Get rid of *& from inline substitutions that can happen when a
569 pointer argument is an ADDR_EXPR. */
570 tree decl = TREE_OPERAND (*tp, 0), value;
573 n = splay_tree_lookup (id->decl_map, (splay_tree_key) decl);
576 value = (tree) n->value;
578 if (TREE_CODE (value) == ADDR_EXPR
579 && (lang_hooks.types_compatible_p
580 (TREE_TYPE (*tp), TREE_TYPE (TREE_OPERAND (value, 0)))))
582 *tp = TREE_OPERAND (value, 0);
583 return copy_body_r (tp, walk_subtrees, data);
588 copy_tree_r (tp, walk_subtrees, NULL);
590 if (TREE_CODE (*tp) == CALL_EXPR && id->node && get_callee_fndecl (*tp))
594 struct cgraph_node *node;
595 struct cgraph_edge *edge;
597 for (node = id->node->next_clone; node; node = node->next_clone)
599 edge = cgraph_edge (node, old_node);
601 edge->call_expr = *tp;
606 struct cgraph_edge *edge
607 = cgraph_edge (id->current_node, old_node);
610 cgraph_clone_edge (edge, id->node, *tp);
614 TREE_TYPE (*tp) = remap_type (TREE_TYPE (*tp), id);
616 /* The copied TARGET_EXPR has never been expanded, even if the
617 original node was expanded already. */
618 if (TREE_CODE (*tp) == TARGET_EXPR && TREE_OPERAND (*tp, 3))
620 TREE_OPERAND (*tp, 1) = TREE_OPERAND (*tp, 3);
621 TREE_OPERAND (*tp, 3) = NULL_TREE;
624 /* Variable substitution need not be simple. In particular, the
625 INDIRECT_REF substitution above. Make sure that TREE_CONSTANT
626 and friends are up-to-date. */
627 else if (TREE_CODE (*tp) == ADDR_EXPR)
629 walk_tree (&TREE_OPERAND (*tp, 0), copy_body_r, id, NULL);
630 recompute_tree_invarant_for_addr_expr (*tp);
635 /* Keep iterating. */
639 /* Make a copy of the body of FN so that it can be inserted inline in
643 copy_body (inline_data *id)
646 tree fndecl = VARRAY_TOP_TREE (id->fns);
648 if (fndecl == current_function_decl
650 body = cfun->saved_tree;
652 body = DECL_SAVED_TREE (fndecl);
653 walk_tree (&body, copy_body_r, id, NULL);
658 /* Return true if VALUE is an ADDR_EXPR of an automatic variable
659 defined in function FN, or of a data member thereof. */
662 self_inlining_addr_expr (tree value, tree fn)
666 if (TREE_CODE (value) != ADDR_EXPR)
669 var = get_base_address (TREE_OPERAND (value, 0));
671 return var && lang_hooks.tree_inlining.auto_var_in_fn_p (var, fn);
675 setup_one_parameter (inline_data *id, tree p, tree value, tree fn,
676 tree *init_stmts, tree *vars, bool *gimplify_init_stmts_p)
681 /* If the parameter is never assigned to, we may not need to
682 create a new variable here at all. Instead, we may be able
683 to just use the argument value. */
684 if (TREE_READONLY (p)
685 && !TREE_ADDRESSABLE (p)
686 && value && !TREE_SIDE_EFFECTS (value))
688 /* We can't risk substituting complex expressions. They
689 might contain variables that will be assigned to later.
690 Theoretically, we could check the expression to see if
691 all of the variables that determine its value are
692 read-only, but we don't bother. */
693 /* We may produce non-gimple trees by adding NOPs or introduce
694 invalid sharing when operand is not really constant.
695 It is not big deal to prohibit constant propagation here as
696 we will constant propagate in DOM1 pass anyway. */
697 if (is_gimple_min_invariant (value)
698 && lang_hooks.types_compatible_p (TREE_TYPE (value), TREE_TYPE (p))
699 /* We have to be very careful about ADDR_EXPR. Make sure
700 the base variable isn't a local variable of the inlined
701 function, e.g., when doing recursive inlining, direct or
702 mutually-recursive or whatever, which is why we don't
703 just test whether fn == current_function_decl. */
704 && ! self_inlining_addr_expr (value, fn))
706 insert_decl_map (id, p, value);
711 /* Make an equivalent VAR_DECL. Note that we must NOT remap the type
712 here since the type of this decl must be visible to the calling
714 var = copy_decl_for_inlining (p, fn, VARRAY_TREE (id->fns, 0));
716 /* Register the VAR_DECL as the equivalent for the PARM_DECL;
717 that way, when the PARM_DECL is encountered, it will be
718 automatically replaced by the VAR_DECL. */
719 insert_decl_map (id, p, var);
721 /* Declare this new variable. */
722 TREE_CHAIN (var) = *vars;
725 /* Make gimplifier happy about this variable. */
726 DECL_SEEN_IN_BIND_EXPR_P (var) = 1;
728 /* Even if P was TREE_READONLY, the new VAR should not be.
729 In the original code, we would have constructed a
730 temporary, and then the function body would have never
731 changed the value of P. However, now, we will be
732 constructing VAR directly. The constructor body may
733 change its value multiple times as it is being
734 constructed. Therefore, it must not be TREE_READONLY;
735 the back-end assumes that TREE_READONLY variable is
736 assigned to only once. */
737 if (TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (p)))
738 TREE_READONLY (var) = 0;
740 /* Initialize this VAR_DECL from the equivalent argument. Convert
741 the argument to the proper type in case it was promoted. */
744 tree rhs = fold_convert (TREE_TYPE (var), value);
746 if (rhs == error_mark_node)
749 /* We want to use MODIFY_EXPR, not INIT_EXPR here so that we
750 keep our trees in gimple form. */
751 init_stmt = build (MODIFY_EXPR, TREE_TYPE (var), var, rhs);
752 append_to_statement_list (init_stmt, init_stmts);
754 /* If we did not create a gimple value and we did not create a gimple
755 cast of a gimple value, then we will need to gimplify INIT_STMTS
756 at the end. Note that is_gimple_cast only checks the outer
757 tree code, not its operand. Thus the explicit check that it's
758 operand is a gimple value. */
759 if (!is_gimple_val (rhs)
760 && (!is_gimple_cast (rhs)
761 || !is_gimple_val (TREE_OPERAND (rhs, 0))))
762 *gimplify_init_stmts_p = true;
766 /* Generate code to initialize the parameters of the function at the
767 top of the stack in ID from the ARGS (presented as a TREE_LIST). */
770 initialize_inlined_parameters (inline_data *id, tree args, tree static_chain,
771 tree fn, tree bind_expr)
773 tree init_stmts = NULL_TREE;
777 tree vars = NULL_TREE;
778 bool gimplify_init_stmts_p = false;
781 /* Figure out what the parameters are. */
782 parms = DECL_ARGUMENTS (fn);
783 if (fn == current_function_decl)
784 parms = cfun->saved_args;
786 /* Loop through the parameter declarations, replacing each with an
787 equivalent VAR_DECL, appropriately initialized. */
788 for (p = parms, a = args; p;
789 a = a ? TREE_CHAIN (a) : a, p = TREE_CHAIN (p))
795 /* Find the initializer. */
796 value = lang_hooks.tree_inlining.convert_parm_for_inlining
797 (p, a ? TREE_VALUE (a) : NULL_TREE, fn, argnum);
799 setup_one_parameter (id, p, value, fn, &init_stmts, &vars,
800 &gimplify_init_stmts_p);
803 /* Evaluate trailing arguments. */
804 for (; a; a = TREE_CHAIN (a))
806 tree value = TREE_VALUE (a);
807 append_to_statement_list (value, &init_stmts);
810 /* Initialize the static chain. */
811 p = DECL_STRUCT_FUNCTION (fn)->static_chain_decl;
814 /* No static chain? Seems like a bug in tree-nested.c. */
815 gcc_assert (static_chain);
817 setup_one_parameter (id, p, static_chain, fn, &init_stmts, &vars,
818 &gimplify_init_stmts_p);
821 if (gimplify_init_stmts_p)
822 gimplify_body (&init_stmts, current_function_decl, false);
824 declare_inline_vars (bind_expr, vars);
828 /* Declare a return variable to replace the RESULT_DECL for the function we
829 are calling. RETURN_SLOT_ADDR, if non-null, was a fake parameter that
830 took the address of the result. MODIFY_DEST, if non-null, was the LHS of
831 the MODIFY_EXPR to which this call is the RHS.
833 The return value is a (possibly null) value that is the result of the
834 function as seen by the callee. *USE_P is a (possibly null) value that
835 holds the result as seen by the caller. */
838 declare_return_variable (inline_data *id, tree return_slot_addr,
839 tree modify_dest, tree *use_p)
841 tree callee = VARRAY_TOP_TREE (id->fns);
842 tree caller = VARRAY_TREE (id->fns, 0);
843 tree result = DECL_RESULT (callee);
844 tree callee_type = TREE_TYPE (result);
845 tree caller_type = TREE_TYPE (TREE_TYPE (callee));
848 /* We don't need to do anything for functions that don't return
850 if (!result || VOID_TYPE_P (callee_type))
856 /* If there was a return slot, then the return value is the
857 dereferenced address of that object. */
858 if (return_slot_addr)
860 /* The front end shouldn't have used both return_slot_addr and
861 a modify expression. */
862 gcc_assert (!modify_dest);
863 if (DECL_BY_REFERENCE (result))
864 var = return_slot_addr;
866 var = build_fold_indirect_ref (return_slot_addr);
871 /* All types requiring non-trivial constructors should have been handled. */
872 gcc_assert (!TREE_ADDRESSABLE (callee_type));
874 /* Attempt to avoid creating a new temporary variable. */
879 /* We can't use MODIFY_DEST if there's type promotion involved. */
880 if (!lang_hooks.types_compatible_p (caller_type, callee_type))
883 /* ??? If we're assigning to a variable sized type, then we must
884 reuse the destination variable, because we've no good way to
885 create variable sized temporaries at this point. */
886 else if (TREE_CODE (TYPE_SIZE_UNIT (caller_type)) != INTEGER_CST)
889 /* If the callee cannot possibly modify MODIFY_DEST, then we can
890 reuse it as the result of the call directly. Don't do this if
891 it would promote MODIFY_DEST to addressable. */
892 else if (!TREE_STATIC (modify_dest)
893 && !TREE_ADDRESSABLE (modify_dest)
894 && !TREE_ADDRESSABLE (result))
905 gcc_assert (TREE_CODE (TYPE_SIZE_UNIT (callee_type)) == INTEGER_CST);
907 var = copy_decl_for_inlining (result, callee, caller);
908 DECL_SEEN_IN_BIND_EXPR_P (var) = 1;
909 DECL_STRUCT_FUNCTION (caller)->unexpanded_var_list
910 = tree_cons (NULL_TREE, var,
911 DECL_STRUCT_FUNCTION (caller)->unexpanded_var_list);
913 /* Do not have the rest of GCC warn about this variable as it should
914 not be visible to the user. */
915 TREE_NO_WARNING (var) = 1;
917 /* Build the use expr. If the return type of the function was
918 promoted, convert it back to the expected type. */
920 if (!lang_hooks.types_compatible_p (TREE_TYPE (var), caller_type))
921 use = fold_convert (caller_type, var);
924 /* Register the VAR_DECL as the equivalent for the RESULT_DECL; that
925 way, when the RESULT_DECL is encountered, it will be
926 automatically replaced by the VAR_DECL. */
927 insert_decl_map (id, result, var);
929 /* Remember this so we can ignore it in remap_decls. */
936 /* Returns nonzero if a function can be inlined as a tree. */
939 tree_inlinable_function_p (tree fn)
941 return inlinable_function_p (fn);
944 static const char *inline_forbidden_reason;
947 inline_forbidden_p_1 (tree *nodep, int *walk_subtrees ATTRIBUTE_UNUSED,
951 tree fn = (tree) fnp;
954 switch (TREE_CODE (node))
957 /* Refuse to inline alloca call unless user explicitly forced so as
958 this may change program's memory overhead drastically when the
959 function using alloca is called in loop. In GCC present in
960 SPEC2000 inlining into schedule_block cause it to require 2GB of
961 RAM instead of 256MB. */
962 if (alloca_call_p (node)
963 && !lookup_attribute ("always_inline", DECL_ATTRIBUTES (fn)))
965 inline_forbidden_reason
966 = N_("%Jfunction %qF can never be inlined because it uses "
967 "alloca (override using the always_inline attribute)");
970 t = get_callee_fndecl (node);
974 /* We cannot inline functions that call setjmp. */
975 if (setjmp_call_p (t))
977 inline_forbidden_reason
978 = N_("%Jfunction %qF can never be inlined because it uses setjmp");
982 if (DECL_BUILT_IN_CLASS (t) == BUILT_IN_NORMAL)
983 switch (DECL_FUNCTION_CODE (t))
985 /* We cannot inline functions that take a variable number of
987 case BUILT_IN_VA_START:
988 case BUILT_IN_STDARG_START:
989 case BUILT_IN_NEXT_ARG:
990 case BUILT_IN_VA_END:
991 inline_forbidden_reason
992 = N_("%Jfunction %qF can never be inlined because it "
993 "uses variable argument lists");
996 case BUILT_IN_LONGJMP:
997 /* We can't inline functions that call __builtin_longjmp at
998 all. The non-local goto machinery really requires the
999 destination be in a different function. If we allow the
1000 function calling __builtin_longjmp to be inlined into the
1001 function calling __builtin_setjmp, Things will Go Awry. */
1002 inline_forbidden_reason
1003 = N_("%Jfunction %qF can never be inlined because "
1004 "it uses setjmp-longjmp exception handling");
1007 case BUILT_IN_NONLOCAL_GOTO:
1009 inline_forbidden_reason
1010 = N_("%Jfunction %qF can never be inlined because "
1011 "it uses non-local goto");
1020 t = TREE_OPERAND (node, 0);
1022 /* We will not inline a function which uses computed goto. The
1023 addresses of its local labels, which may be tucked into
1024 global storage, are of course not constant across
1025 instantiations, which causes unexpected behavior. */
1026 if (TREE_CODE (t) != LABEL_DECL)
1028 inline_forbidden_reason
1029 = N_("%Jfunction %qF can never be inlined "
1030 "because it contains a computed goto");
1036 t = TREE_OPERAND (node, 0);
1037 if (DECL_NONLOCAL (t))
1039 /* We cannot inline a function that receives a non-local goto
1040 because we cannot remap the destination label used in the
1041 function that is performing the non-local goto. */
1042 inline_forbidden_reason
1043 = N_("%Jfunction %qF can never be inlined "
1044 "because it receives a non-local goto");
1051 /* We cannot inline a function of the form
1053 void F (int i) { struct S { int ar[i]; } s; }
1055 Attempting to do so produces a catch-22.
1056 If walk_tree examines the TYPE_FIELDS chain of RECORD_TYPE/
1057 UNION_TYPE nodes, then it goes into infinite recursion on a
1058 structure containing a pointer to its own type. If it doesn't,
1059 then the type node for S doesn't get adjusted properly when
1060 F is inlined, and we abort in find_function_data.
1062 ??? This is likely no longer true, but it's too late in the 4.0
1063 cycle to try to find out. This should be checked for 4.1. */
1064 for (t = TYPE_FIELDS (node); t; t = TREE_CHAIN (t))
1065 if (variably_modified_type_p (TREE_TYPE (t), NULL))
1067 inline_forbidden_reason
1068 = N_("%Jfunction %qF can never be inlined "
1069 "because it uses variable sized variables");
1080 /* Return subexpression representing possible alloca call, if any. */
1082 inline_forbidden_p (tree fndecl)
1084 location_t saved_loc = input_location;
1085 tree ret = walk_tree_without_duplicates (&DECL_SAVED_TREE (fndecl),
1086 inline_forbidden_p_1, fndecl);
1088 input_location = saved_loc;
1092 /* Returns nonzero if FN is a function that does not have any
1093 fundamental inline blocking properties. */
1096 inlinable_function_p (tree fn)
1098 bool inlinable = true;
1100 /* If we've already decided this function shouldn't be inlined,
1101 there's no need to check again. */
1102 if (DECL_UNINLINABLE (fn))
1105 /* See if there is any language-specific reason it cannot be
1106 inlined. (It is important that this hook be called early because
1107 in C++ it may result in template instantiation.)
1108 If the function is not inlinable for language-specific reasons,
1109 it is left up to the langhook to explain why. */
1110 inlinable = !lang_hooks.tree_inlining.cannot_inline_tree_fn (&fn);
1112 /* If we don't have the function body available, we can't inline it.
1113 However, this should not be recorded since we also get here for
1114 forward declared inline functions. Therefore, return at once. */
1115 if (!DECL_SAVED_TREE (fn))
1118 /* If we're not inlining at all, then we cannot inline this function. */
1119 else if (!flag_inline_trees)
1122 /* Only try to inline functions if DECL_INLINE is set. This should be
1123 true for all functions declared `inline', and for all other functions
1124 as well with -finline-functions.
1126 Don't think of disregarding DECL_INLINE when flag_inline_trees == 2;
1127 it's the front-end that must set DECL_INLINE in this case, because
1128 dwarf2out loses if a function that does not have DECL_INLINE set is
1129 inlined anyway. That is why we have both DECL_INLINE and
1130 DECL_DECLARED_INLINE_P. */
1131 /* FIXME: When flag_inline_trees dies, the check for flag_unit_at_a_time
1132 here should be redundant. */
1133 else if (!DECL_INLINE (fn) && !flag_unit_at_a_time)
1136 else if (inline_forbidden_p (fn))
1138 /* See if we should warn about uninlinable functions. Previously,
1139 some of these warnings would be issued while trying to expand
1140 the function inline, but that would cause multiple warnings
1141 about functions that would for example call alloca. But since
1142 this a property of the function, just one warning is enough.
1143 As a bonus we can now give more details about the reason why a
1144 function is not inlinable.
1145 We only warn for functions declared `inline' by the user. */
1146 bool do_warning = (warn_inline
1148 && DECL_DECLARED_INLINE_P (fn)
1149 && !DECL_IN_SYSTEM_HEADER (fn));
1151 if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (fn)))
1152 sorry (inline_forbidden_reason, fn, fn);
1153 else if (do_warning)
1154 warning (inline_forbidden_reason, fn, fn);
1159 /* Squirrel away the result so that we don't have to check again. */
1160 DECL_UNINLINABLE (fn) = !inlinable;
1165 /* Used by estimate_num_insns. Estimate number of instructions seen
1166 by given statement. */
1169 estimate_num_insns_1 (tree *tp, int *walk_subtrees, void *data)
1174 if (IS_TYPE_OR_DECL_P (x))
1179 /* Assume that constants and references counts nothing. These should
1180 be majorized by amount of operations among them we count later
1181 and are common target of CSE and similar optimizations. */
1182 else if (CONSTANT_CLASS_P (x) || REFERENCE_CLASS_P (x))
1185 switch (TREE_CODE (x))
1187 /* Containers have no cost. */
1195 case ARRAY_RANGE_REF:
1197 case EXC_PTR_EXPR: /* ??? */
1198 case FILTER_EXPR: /* ??? */
1201 case WITH_CLEANUP_EXPR:
1203 case VIEW_CONVERT_EXPR:
1208 case CASE_LABEL_EXPR:
1211 case EH_FILTER_EXPR:
1212 case STATEMENT_LIST:
1214 case NON_LVALUE_EXPR:
1217 case TRY_CATCH_EXPR:
1218 case TRY_FINALLY_EXPR:
1225 case WITH_SIZE_EXPR:
1228 /* We don't account constants for now. Assume that the cost is amortized
1229 by operations that do use them. We may re-consider this decision once
1230 we are able to optimize the tree before estimating it's size and break
1231 out static initializers. */
1232 case IDENTIFIER_NODE:
1241 /* Recognize assignments of large structures and constructors of
1245 x = TREE_OPERAND (x, 0);
1252 size = int_size_in_bytes (TREE_TYPE (x));
1254 if (size < 0 || size > MOVE_MAX_PIECES * MOVE_RATIO)
1257 *count += ((size + MOVE_MAX_PIECES - 1) / MOVE_MAX_PIECES);
1261 /* Assign cost of 1 to usual operations.
1262 ??? We may consider mapping RTL costs to this. */
1269 case FIX_TRUNC_EXPR:
1271 case FIX_FLOOR_EXPR:
1272 case FIX_ROUND_EXPR:
1290 case TRUTH_ANDIF_EXPR:
1291 case TRUTH_ORIF_EXPR:
1292 case TRUTH_AND_EXPR:
1294 case TRUTH_XOR_EXPR:
1295 case TRUTH_NOT_EXPR:
1304 case UNORDERED_EXPR:
1317 case PREDECREMENT_EXPR:
1318 case PREINCREMENT_EXPR:
1319 case POSTDECREMENT_EXPR:
1320 case POSTINCREMENT_EXPR:
1330 /* Few special cases of expensive operations. This is useful
1331 to avoid inlining on functions having too many of these. */
1332 case TRUNC_DIV_EXPR:
1334 case FLOOR_DIV_EXPR:
1335 case ROUND_DIV_EXPR:
1336 case EXACT_DIV_EXPR:
1337 case TRUNC_MOD_EXPR:
1339 case FLOOR_MOD_EXPR:
1340 case ROUND_MOD_EXPR:
1346 tree decl = get_callee_fndecl (x);
1348 if (decl && DECL_BUILT_IN (decl))
1349 switch (DECL_FUNCTION_CODE (decl))
1351 case BUILT_IN_CONSTANT_P:
1354 case BUILT_IN_EXPECT:
1363 /* Abort here se we know we don't miss any nodes. */
1369 /* Estimate number of instructions that will be created by expanding EXPR. */
1372 estimate_num_insns (tree expr)
1375 walk_tree_without_duplicates (&expr, estimate_num_insns_1, &num);
1379 /* If *TP is a CALL_EXPR, replace it with its inline expansion. */
1382 expand_call_inline (tree *tp, int *walk_subtrees, void *data)
1395 tree return_slot_addr;
1397 location_t saved_location;
1398 struct cgraph_edge *edge;
1401 /* See what we've got. */
1402 id = (inline_data *) data;
1405 /* Set input_location here so we get the right instantiation context
1406 if we call instantiate_decl from inlinable_function_p. */
1407 saved_location = input_location;
1408 if (EXPR_HAS_LOCATION (t))
1409 input_location = EXPR_LOCATION (t);
1411 /* Recurse, but letting recursive invocations know that we are
1412 inside the body of a TARGET_EXPR. */
1413 if (TREE_CODE (*tp) == TARGET_EXPR)
1416 int i, len = TREE_CODE_LENGTH (TARGET_EXPR);
1418 /* We're walking our own subtrees. */
1421 /* Actually walk over them. This loop is the body of
1422 walk_trees, omitting the case where the TARGET_EXPR
1423 itself is handled. */
1424 for (i = 0; i < len; ++i)
1427 ++id->in_target_cleanup_p;
1428 walk_tree (&TREE_OPERAND (*tp, i), expand_call_inline, data,
1431 --id->in_target_cleanup_p;
1439 /* Because types were not copied in copy_body, CALL_EXPRs beneath
1440 them should not be expanded. This can happen if the type is a
1441 dynamic array type, for example. */
1444 /* From here on, we're only interested in CALL_EXPRs. */
1445 if (TREE_CODE (t) != CALL_EXPR)
1448 /* First, see if we can figure out what function is being called.
1449 If we cannot, then there is no hope of inlining the function. */
1450 fn = get_callee_fndecl (t);
1454 /* Turn forward declarations into real ones. */
1455 fn = cgraph_node (fn)->decl;
1457 /* If fn is a declaration of a function in a nested scope that was
1458 globally declared inline, we don't set its DECL_INITIAL.
1459 However, we can't blindly follow DECL_ABSTRACT_ORIGIN because the
1460 C++ front-end uses it for cdtors to refer to their internal
1461 declarations, that are not real functions. Fortunately those
1462 don't have trees to be saved, so we can tell by checking their
1464 if (! DECL_INITIAL (fn)
1465 && DECL_ABSTRACT_ORIGIN (fn)
1466 && DECL_SAVED_TREE (DECL_ABSTRACT_ORIGIN (fn)))
1467 fn = DECL_ABSTRACT_ORIGIN (fn);
1469 /* Objective C and fortran still calls tree_rest_of_compilation directly.
1470 Kill this check once this is fixed. */
1471 if (!id->current_node->analyzed)
1474 edge = cgraph_edge (id->current_node, t);
1476 /* Constant propagation on argument done during previous inlining
1477 may create new direct call. Produce an edge for it. */
1480 struct cgraph_node *dest = cgraph_node (fn);
1482 /* We have missing edge in the callgraph. This can happen in one case
1483 where previous inlining turned indirect call into direct call by
1484 constant propagating arguments. In all other cases we hit a bug
1485 (incorrect node sharing is most common reason for missing edges. */
1486 gcc_assert (dest->needed || !flag_unit_at_a_time);
1487 cgraph_create_edge (id->node, dest, t)->inline_failed
1488 = N_("originally indirect function call not considered for inlining");
1492 /* Don't try to inline functions that are not well-suited to
1494 if (!cgraph_inline_p (edge, &reason))
1496 if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (fn)))
1498 sorry ("%Jinlining failed in call to %qF: %s", fn, fn, reason);
1499 sorry ("called from here");
1501 else if (warn_inline && DECL_DECLARED_INLINE_P (fn)
1502 && !DECL_IN_SYSTEM_HEADER (fn)
1504 && !lookup_attribute ("noinline", DECL_ATTRIBUTES (fn)))
1506 warning ("%Jinlining failed in call to %qF: %s", fn, fn, reason);
1507 warning ("called from here");
1512 #ifdef ENABLE_CHECKING
1513 if (edge->callee->decl != id->node->decl)
1514 verify_cgraph_node (edge->callee);
1517 if (! lang_hooks.tree_inlining.start_inlining (fn))
1520 /* Build a block containing code to initialize the arguments, the
1521 actual inline expansion of the body, and a label for the return
1522 statements within the function to jump to. The type of the
1523 statement expression is the return type of the function call. */
1525 expr = build (BIND_EXPR, void_type_node, NULL_TREE,
1526 stmt, make_node (BLOCK));
1527 BLOCK_ABSTRACT_ORIGIN (BIND_EXPR_BLOCK (expr)) = fn;
1529 /* Local declarations will be replaced by their equivalents in this
1532 id->decl_map = splay_tree_new (splay_tree_compare_pointers,
1535 /* Initialize the parameters. */
1536 args = TREE_OPERAND (t, 1);
1537 return_slot_addr = NULL_TREE;
1538 if (CALL_EXPR_HAS_RETURN_SLOT_ADDR (t))
1540 return_slot_addr = TREE_VALUE (args);
1541 args = TREE_CHAIN (args);
1542 TREE_TYPE (expr) = void_type_node;
1545 arg_inits = initialize_inlined_parameters (id, args, TREE_OPERAND (t, 2),
1549 /* Expand any inlined calls in the initializers. Do this before we
1550 push FN on the stack of functions we are inlining; we want to
1551 inline calls to FN that appear in the initializers for the
1554 Note we need to save and restore the saved tree statement iterator
1555 to avoid having it clobbered by expand_calls_inline. */
1556 tree_stmt_iterator save_tsi;
1559 expand_calls_inline (&arg_inits, id);
1562 /* And add them to the tree. */
1563 append_to_statement_list (arg_inits, &BIND_EXPR_BODY (expr));
1566 /* Record the function we are about to inline so that we can avoid
1567 recursing into it. */
1568 VARRAY_PUSH_TREE (id->fns, fn);
1570 /* Record the function we are about to inline if optimize_function
1571 has not been called on it yet and we don't have it in the list. */
1572 if (! DECL_INLINED_FNS (fn))
1576 for (i = VARRAY_ACTIVE_SIZE (id->inlined_fns) - 1; i >= 0; i--)
1577 if (VARRAY_TREE (id->inlined_fns, i) == fn)
1580 VARRAY_PUSH_TREE (id->inlined_fns, fn);
1583 /* Return statements in the function body will be replaced by jumps
1584 to the RET_LABEL. */
1585 id->ret_label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
1586 DECL_ARTIFICIAL (id->ret_label) = 1;
1587 DECL_CONTEXT (id->ret_label) = VARRAY_TREE (id->fns, 0);
1588 insert_decl_map (id, id->ret_label, id->ret_label);
1590 gcc_assert (DECL_INITIAL (fn));
1591 gcc_assert (TREE_CODE (DECL_INITIAL (fn)) == BLOCK);
1593 /* Find the lhs to which the result of this call is assigned. */
1594 modify_dest = tsi_stmt (id->tsi);
1595 if (TREE_CODE (modify_dest) == MODIFY_EXPR)
1596 modify_dest = TREE_OPERAND (modify_dest, 0);
1600 /* Declare the return variable for the function. */
1601 decl = declare_return_variable (id, return_slot_addr,
1602 modify_dest, &use_retvar);
1604 /* After we've initialized the parameters, we insert the body of the
1607 struct cgraph_node *old_node = id->current_node;
1609 id->current_node = edge->callee;
1610 append_to_statement_list (copy_body (id), &BIND_EXPR_BODY (expr));
1611 id->current_node = old_node;
1613 inlined_body = &BIND_EXPR_BODY (expr);
1615 /* After the body of the function comes the RET_LABEL. This must come
1616 before we evaluate the returned value below, because that evaluation
1617 may cause RTL to be generated. */
1618 if (TREE_USED (id->ret_label))
1620 tree label = build1 (LABEL_EXPR, void_type_node, id->ret_label);
1621 append_to_statement_list (label, &BIND_EXPR_BODY (expr));
1625 splay_tree_delete (id->decl_map);
1628 /* Although, from the semantic viewpoint, the new expression has
1629 side-effects only if the old one did, it is not possible, from
1630 the technical viewpoint, to evaluate the body of a function
1631 multiple times without serious havoc. */
1632 TREE_SIDE_EFFECTS (expr) = 1;
1634 tsi_link_before (&id->tsi, expr, TSI_SAME_STMT);
1636 /* If the inlined function returns a result that we care about,
1637 then we're going to need to splice in a MODIFY_EXPR. Otherwise
1638 the call was a standalone statement and we can just replace it
1639 with the BIND_EXPR inline representation of the called function. */
1640 if (!use_retvar || !modify_dest)
1641 *tsi_stmt_ptr (id->tsi) = build_empty_stmt ();
1645 /* When we gimplify a function call, we may clear TREE_SIDE_EFFECTS on
1646 the call if it is to a "const" function. Thus the copy of
1647 TREE_SIDE_EFFECTS from the CALL_EXPR to the BIND_EXPR above with
1648 result in TREE_SIDE_EFFECTS not being set for the inlined copy of a
1651 Unfortunately, that is wrong as inlining the function can create/expose
1652 interesting side effects (such as setting of a return value).
1654 The easiest solution is to simply recalculate TREE_SIDE_EFFECTS for
1655 the toplevel expression. */
1656 recalculate_side_effects (expr);
1658 /* Update callgraph if needed. */
1659 cgraph_remove_node (edge->callee);
1661 /* Recurse into the body of the just inlined function. */
1662 expand_calls_inline (inlined_body, id);
1663 VARRAY_POP (id->fns);
1665 /* Don't walk into subtrees. We've already handled them above. */
1668 lang_hooks.tree_inlining.end_inlining (fn);
1670 /* Keep iterating. */
1672 input_location = saved_location;
1677 expand_calls_inline (tree *stmt_p, inline_data *id)
1679 tree stmt = *stmt_p;
1680 enum tree_code code = TREE_CODE (stmt);
1685 case STATEMENT_LIST:
1687 tree_stmt_iterator i;
1690 for (i = tsi_start (stmt); !tsi_end_p (i); )
1693 expand_calls_inline (tsi_stmt_ptr (i), id);
1696 if (TREE_CODE (new) == STATEMENT_LIST)
1698 tsi_link_before (&i, new, TSI_SAME_STMT);
1708 expand_calls_inline (&COND_EXPR_THEN (stmt), id);
1709 expand_calls_inline (&COND_EXPR_ELSE (stmt), id);
1713 expand_calls_inline (&CATCH_BODY (stmt), id);
1716 case EH_FILTER_EXPR:
1717 expand_calls_inline (&EH_FILTER_FAILURE (stmt), id);
1720 case TRY_CATCH_EXPR:
1721 case TRY_FINALLY_EXPR:
1722 expand_calls_inline (&TREE_OPERAND (stmt, 0), id);
1723 expand_calls_inline (&TREE_OPERAND (stmt, 1), id);
1727 expand_calls_inline (&BIND_EXPR_BODY (stmt), id);
1731 /* We're gimple. We should have gotten rid of all these. */
1735 stmt_p = &TREE_OPERAND (stmt, 0);
1737 if (!stmt || TREE_CODE (stmt) != MODIFY_EXPR)
1743 stmt_p = &TREE_OPERAND (stmt, 1);
1745 if (TREE_CODE (stmt) == WITH_SIZE_EXPR)
1747 stmt_p = &TREE_OPERAND (stmt, 0);
1750 if (TREE_CODE (stmt) != CALL_EXPR)
1756 expand_call_inline (stmt_p, &dummy, id);
1764 /* Expand calls to inline functions in the body of FN. */
1767 optimize_inline_calls (tree fn)
1773 /* There is no point in performing inlining if errors have already
1774 occurred -- and we might crash if we try to inline invalid
1776 if (errorcount || sorrycount)
1780 memset (&id, 0, sizeof (id));
1782 id.current_node = id.node = cgraph_node (fn);
1783 /* Don't allow recursion into FN. */
1784 VARRAY_TREE_INIT (id.fns, 32, "fns");
1785 VARRAY_PUSH_TREE (id.fns, fn);
1786 /* Or any functions that aren't finished yet. */
1787 prev_fn = NULL_TREE;
1788 if (current_function_decl)
1790 VARRAY_PUSH_TREE (id.fns, current_function_decl);
1791 prev_fn = current_function_decl;
1794 prev_fn = lang_hooks.tree_inlining.add_pending_fn_decls (&id.fns, prev_fn);
1796 /* Create the list of functions this call will inline. */
1797 VARRAY_TREE_INIT (id.inlined_fns, 32, "inlined_fns");
1799 /* Keep track of the low-water mark, i.e., the point where the first
1800 real inlining is represented in ID.FNS. */
1801 id.first_inlined_fn = VARRAY_ACTIVE_SIZE (id.fns);
1803 /* Replace all calls to inline functions with the bodies of those
1805 id.tree_pruner = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
1806 expand_calls_inline (&DECL_SAVED_TREE (fn), &id);
1809 htab_delete (id.tree_pruner);
1810 ifn = make_tree_vec (VARRAY_ACTIVE_SIZE (id.inlined_fns));
1811 if (VARRAY_ACTIVE_SIZE (id.inlined_fns))
1812 memcpy (&TREE_VEC_ELT (ifn, 0), &VARRAY_TREE (id.inlined_fns, 0),
1813 VARRAY_ACTIVE_SIZE (id.inlined_fns) * sizeof (tree));
1814 DECL_INLINED_FNS (fn) = ifn;
1816 #ifdef ENABLE_CHECKING
1818 struct cgraph_edge *e;
1820 verify_cgraph_node (id.node);
1822 /* Double check that we inlined everything we are supposed to inline. */
1823 for (e = id.node->callees; e; e = e->next_callee)
1824 gcc_assert (e->inline_failed);
1829 /* FN is a function that has a complete body, and CLONE is a function whose
1830 body is to be set to a copy of FN, mapping argument declarations according
1831 to the ARG_MAP splay_tree. */
1834 clone_body (tree clone, tree fn, void *arg_map)
1838 /* Clone the body, as if we were making an inline call. But, remap the
1839 parameters in the callee to the parameters of caller. If there's an
1840 in-charge parameter, map it to an appropriate constant. */
1841 memset (&id, 0, sizeof (id));
1842 VARRAY_TREE_INIT (id.fns, 2, "fns");
1843 VARRAY_PUSH_TREE (id.fns, clone);
1844 VARRAY_PUSH_TREE (id.fns, fn);
1845 id.decl_map = (splay_tree)arg_map;
1847 /* Cloning is treated slightly differently from inlining. Set
1848 CLONING_P so that it's clear which operation we're performing. */
1849 id.cloning_p = true;
1851 /* Actually copy the body. */
1852 append_to_statement_list_force (copy_body (&id), &DECL_SAVED_TREE (clone));
1855 /* Make and return duplicate of body in FN. Put copies of DECL_ARGUMENTS
1856 in *arg_copy and of the static chain, if any, in *sc_copy. */
1859 save_body (tree fn, tree *arg_copy, tree *sc_copy)
1864 memset (&id, 0, sizeof (id));
1865 VARRAY_TREE_INIT (id.fns, 1, "fns");
1866 VARRAY_PUSH_TREE (id.fns, fn);
1867 id.node = cgraph_node (fn);
1869 id.decl_map = splay_tree_new (splay_tree_compare_pointers, NULL, NULL);
1870 *arg_copy = DECL_ARGUMENTS (fn);
1872 for (parg = arg_copy; *parg; parg = &TREE_CHAIN (*parg))
1874 tree new = copy_node (*parg);
1876 lang_hooks.dup_lang_specific_decl (new);
1877 DECL_ABSTRACT_ORIGIN (new) = DECL_ORIGIN (*parg);
1878 insert_decl_map (&id, *parg, new);
1879 TREE_CHAIN (new) = TREE_CHAIN (*parg);
1883 *sc_copy = DECL_STRUCT_FUNCTION (fn)->static_chain_decl;
1886 tree new = copy_node (*sc_copy);
1888 lang_hooks.dup_lang_specific_decl (new);
1889 DECL_ABSTRACT_ORIGIN (new) = DECL_ORIGIN (*sc_copy);
1890 insert_decl_map (&id, *sc_copy, new);
1891 TREE_CHAIN (new) = TREE_CHAIN (*sc_copy);
1895 insert_decl_map (&id, DECL_RESULT (fn), DECL_RESULT (fn));
1897 /* Actually copy the body. */
1898 body = copy_body (&id);
1901 splay_tree_delete (id.decl_map);
1905 #define WALK_SUBTREE(NODE) \
1908 result = walk_tree (&(NODE), func, data, pset); \
1914 /* This is a subroutine of walk_tree that walks field of TYPE that are to
1915 be walked whenever a type is seen in the tree. Rest of operands and return
1916 value are as for walk_tree. */
1919 walk_type_fields (tree type, walk_tree_fn func, void *data,
1920 struct pointer_set_t *pset)
1922 tree result = NULL_TREE;
1924 switch (TREE_CODE (type))
1927 case REFERENCE_TYPE:
1928 /* We have to worry about mutually recursive pointers. These can't
1929 be written in C. They can in Ada. It's pathological, but
1930 there's an ACATS test (c38102a) that checks it. Deal with this
1931 by checking if we're pointing to another pointer, that one
1932 points to another pointer, that one does too, and we have no htab.
1933 If so, get a hash table. We check three levels deep to avoid
1934 the cost of the hash table if we don't need one. */
1935 if (POINTER_TYPE_P (TREE_TYPE (type))
1936 && POINTER_TYPE_P (TREE_TYPE (TREE_TYPE (type)))
1937 && POINTER_TYPE_P (TREE_TYPE (TREE_TYPE (TREE_TYPE (type))))
1940 result = walk_tree_without_duplicates (&TREE_TYPE (type),
1948 /* ... fall through ... */
1951 WALK_SUBTREE (TREE_TYPE (type));
1955 WALK_SUBTREE (TYPE_METHOD_BASETYPE (type));
1960 WALK_SUBTREE (TREE_TYPE (type));
1964 /* We never want to walk into default arguments. */
1965 for (arg = TYPE_ARG_TYPES (type); arg; arg = TREE_CHAIN (arg))
1966 WALK_SUBTREE (TREE_VALUE (arg));
1971 /* Don't follow this nodes's type if a pointer for fear that we'll
1972 have infinite recursion. Those types are uninteresting anyway. */
1973 if (!POINTER_TYPE_P (TREE_TYPE (type))
1974 && TREE_CODE (TREE_TYPE (type)) != OFFSET_TYPE)
1975 WALK_SUBTREE (TREE_TYPE (type));
1976 WALK_SUBTREE (TYPE_DOMAIN (type));
1984 WALK_SUBTREE (TYPE_MIN_VALUE (type));
1985 WALK_SUBTREE (TYPE_MAX_VALUE (type));
1989 WALK_SUBTREE (TREE_TYPE (type));
1990 WALK_SUBTREE (TYPE_OFFSET_BASETYPE (type));
2000 /* Apply FUNC to all the sub-trees of TP in a pre-order traversal. FUNC is
2001 called with the DATA and the address of each sub-tree. If FUNC returns a
2002 non-NULL value, the traversal is aborted, and the value returned by FUNC
2003 is returned. If PSET is non-NULL it is used to record the nodes visited,
2004 and to avoid visiting a node more than once. */
2007 walk_tree (tree *tp, walk_tree_fn func, void *data, struct pointer_set_t *pset)
2009 enum tree_code code;
2013 #define WALK_SUBTREE_TAIL(NODE) \
2017 goto tail_recurse; \
2022 /* Skip empty subtrees. */
2026 /* Don't walk the same tree twice, if the user has requested
2027 that we avoid doing so. */
2028 if (pset && pointer_set_insert (pset, *tp))
2031 /* Call the function. */
2033 result = (*func) (tp, &walk_subtrees, data);
2035 /* If we found something, return it. */
2039 code = TREE_CODE (*tp);
2041 /* Even if we didn't, FUNC may have decided that there was nothing
2042 interesting below this point in the tree. */
2045 if (code == TREE_LIST)
2046 /* But we still need to check our siblings. */
2047 WALK_SUBTREE_TAIL (TREE_CHAIN (*tp));
2052 result = lang_hooks.tree_inlining.walk_subtrees (tp, &walk_subtrees, func,
2054 if (result || ! walk_subtrees)
2057 /* If this is a DECL_EXPR, walk into various fields of the type that it's
2058 defining. We only want to walk into these fields of a type in this
2059 case. Note that decls get walked as part of the processing of a
2062 ??? Precisely which fields of types that we are supposed to walk in
2063 this case vs. the normal case aren't well defined. */
2064 if (code == DECL_EXPR
2065 && TREE_CODE (DECL_EXPR_DECL (*tp)) == TYPE_DECL
2066 && TREE_CODE (TREE_TYPE (DECL_EXPR_DECL (*tp))) != ERROR_MARK)
2068 tree *type_p = &TREE_TYPE (DECL_EXPR_DECL (*tp));
2070 /* Call the function for the type. See if it returns anything or
2071 doesn't want us to continue. If we are to continue, walk both
2072 the normal fields and those for the declaration case. */
2073 result = (*func) (type_p, &walk_subtrees, data);
2074 if (result || !walk_subtrees)
2077 result = walk_type_fields (*type_p, func, data, pset);
2081 WALK_SUBTREE (TYPE_SIZE (*type_p));
2082 WALK_SUBTREE (TYPE_SIZE_UNIT (*type_p));
2084 /* If this is a record type, also walk the fields. */
2085 if (TREE_CODE (*type_p) == RECORD_TYPE
2086 || TREE_CODE (*type_p) == UNION_TYPE
2087 || TREE_CODE (*type_p) == QUAL_UNION_TYPE)
2091 for (field = TYPE_FIELDS (*type_p); field;
2092 field = TREE_CHAIN (field))
2094 /* We'd like to look at the type of the field, but we can easily
2095 get infinite recursion. So assume it's pointed to elsewhere
2096 in the tree. Also, ignore things that aren't fields. */
2097 if (TREE_CODE (field) != FIELD_DECL)
2100 WALK_SUBTREE (DECL_FIELD_OFFSET (field));
2101 WALK_SUBTREE (DECL_SIZE (field));
2102 WALK_SUBTREE (DECL_SIZE_UNIT (field));
2103 if (TREE_CODE (*type_p) == QUAL_UNION_TYPE)
2104 WALK_SUBTREE (DECL_QUALIFIER (field));
2109 else if (code != SAVE_EXPR
2110 && code != BIND_EXPR
2111 && IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (code)))
2115 /* Walk over all the sub-trees of this operand. */
2116 len = TREE_CODE_LENGTH (code);
2117 /* TARGET_EXPRs are peculiar: operands 1 and 3 can be the same.
2118 But, we only want to walk once. */
2119 if (code == TARGET_EXPR
2120 && TREE_OPERAND (*tp, 3) == TREE_OPERAND (*tp, 1))
2123 /* Go through the subtrees. We need to do this in forward order so
2124 that the scope of a FOR_EXPR is handled properly. */
2125 #ifdef DEBUG_WALK_TREE
2126 for (i = 0; i < len; ++i)
2127 WALK_SUBTREE (TREE_OPERAND (*tp, i));
2129 for (i = 0; i < len - 1; ++i)
2130 WALK_SUBTREE (TREE_OPERAND (*tp, i));
2134 /* The common case is that we may tail recurse here. */
2135 if (code != BIND_EXPR
2136 && !TREE_CHAIN (*tp))
2137 WALK_SUBTREE_TAIL (TREE_OPERAND (*tp, len - 1));
2139 WALK_SUBTREE (TREE_OPERAND (*tp, len - 1));
2144 /* If this is a type, walk the needed fields in the type. */
2145 else if (TYPE_P (*tp))
2147 result = walk_type_fields (*tp, func, data, pset);
2153 /* Not one of the easy cases. We must explicitly go through the
2158 case IDENTIFIER_NODE:
2164 case PLACEHOLDER_EXPR:
2168 /* None of thse have subtrees other than those already walked
2173 WALK_SUBTREE (TREE_VALUE (*tp));
2174 WALK_SUBTREE_TAIL (TREE_CHAIN (*tp));
2179 int len = TREE_VEC_LENGTH (*tp);
2184 /* Walk all elements but the first. */
2186 WALK_SUBTREE (TREE_VEC_ELT (*tp, len));
2188 /* Now walk the first one as a tail call. */
2189 WALK_SUBTREE_TAIL (TREE_VEC_ELT (*tp, 0));
2193 WALK_SUBTREE (TREE_REALPART (*tp));
2194 WALK_SUBTREE_TAIL (TREE_IMAGPART (*tp));
2197 WALK_SUBTREE_TAIL (CONSTRUCTOR_ELTS (*tp));
2200 WALK_SUBTREE_TAIL (TREE_OPERAND (*tp, 0));
2205 for (decl = BIND_EXPR_VARS (*tp); decl; decl = TREE_CHAIN (decl))
2207 /* Walk the DECL_INITIAL and DECL_SIZE. We don't want to walk
2208 into declarations that are just mentioned, rather than
2209 declared; they don't really belong to this part of the tree.
2210 And, we can see cycles: the initializer for a declaration
2211 can refer to the declaration itself. */
2212 WALK_SUBTREE (DECL_INITIAL (decl));
2213 WALK_SUBTREE (DECL_SIZE (decl));
2214 WALK_SUBTREE (DECL_SIZE_UNIT (decl));
2216 WALK_SUBTREE_TAIL (BIND_EXPR_BODY (*tp));
2219 case STATEMENT_LIST:
2221 tree_stmt_iterator i;
2222 for (i = tsi_start (*tp); !tsi_end_p (i); tsi_next (&i))
2223 WALK_SUBTREE (*tsi_stmt_ptr (i));
2228 /* ??? This could be a language-defined node. We really should make
2229 a hook for it, but right now just ignore it. */
2234 /* We didn't find what we were looking for. */
2238 #undef WALK_SUBTREE_TAIL
2241 /* Like walk_tree, but does not walk duplicate nodes more than once. */
2244 walk_tree_without_duplicates (tree *tp, walk_tree_fn func, void *data)
2247 struct pointer_set_t *pset;
2249 pset = pointer_set_create ();
2250 result = walk_tree (tp, func, data, pset);
2251 pointer_set_destroy (pset);
2255 /* Passed to walk_tree. Copies the node pointed to, if appropriate. */
2258 copy_tree_r (tree *tp, int *walk_subtrees, void *data ATTRIBUTE_UNUSED)
2260 enum tree_code code = TREE_CODE (*tp);
2262 /* We make copies of most nodes. */
2263 if (IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (code))
2264 || code == TREE_LIST
2266 || code == TYPE_DECL)
2268 /* Because the chain gets clobbered when we make a copy, we save it
2270 tree chain = TREE_CHAIN (*tp);
2273 /* Copy the node. */
2274 new = copy_node (*tp);
2276 /* Propagate mudflap marked-ness. */
2277 if (flag_mudflap && mf_marked_p (*tp))
2282 /* Now, restore the chain, if appropriate. That will cause
2283 walk_tree to walk into the chain as well. */
2284 if (code == PARM_DECL || code == TREE_LIST)
2285 TREE_CHAIN (*tp) = chain;
2287 /* For now, we don't update BLOCKs when we make copies. So, we
2288 have to nullify all BIND_EXPRs. */
2289 if (TREE_CODE (*tp) == BIND_EXPR)
2290 BIND_EXPR_BLOCK (*tp) = NULL_TREE;
2293 else if (TREE_CODE_CLASS (code) == tcc_type)
2295 else if (TREE_CODE_CLASS (code) == tcc_declaration)
2297 else if (TREE_CODE_CLASS (code) == tcc_constant)
2300 gcc_assert (code != STATEMENT_LIST);
2304 /* The SAVE_EXPR pointed to by TP is being copied. If ST contains
2305 information indicating to what new SAVE_EXPR this one should be mapped,
2306 use that one. Otherwise, create a new node and enter it in ST. */
2309 remap_save_expr (tree *tp, void *st_, int *walk_subtrees)
2311 splay_tree st = (splay_tree) st_;
2315 /* See if we already encountered this SAVE_EXPR. */
2316 n = splay_tree_lookup (st, (splay_tree_key) *tp);
2318 /* If we didn't already remap this SAVE_EXPR, do so now. */
2321 t = copy_node (*tp);
2323 /* Remember this SAVE_EXPR. */
2324 splay_tree_insert (st, (splay_tree_key) *tp, (splay_tree_value) t);
2325 /* Make sure we don't remap an already-remapped SAVE_EXPR. */
2326 splay_tree_insert (st, (splay_tree_key) t, (splay_tree_value) t);
2330 /* We've already walked into this SAVE_EXPR; don't do it again. */
2332 t = (tree) n->value;
2335 /* Replace this SAVE_EXPR with the copy. */
2339 /* Called via walk_tree. If *TP points to a DECL_STMT for a local label,
2340 copies the declaration and enters it in the splay_tree in DATA (which is
2341 really an `inline_data *'). */
2344 mark_local_for_remap_r (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
2347 inline_data *id = (inline_data *) data;
2349 /* Don't walk into types. */
2353 else if (TREE_CODE (*tp) == LABEL_EXPR)
2355 tree decl = TREE_OPERAND (*tp, 0);
2357 /* Copy the decl and remember the copy. */
2358 insert_decl_map (id, decl,
2359 copy_decl_for_inlining (decl, DECL_CONTEXT (decl),
2360 DECL_CONTEXT (decl)));
2366 /* Perform any modifications to EXPR required when it is unsaved. Does
2367 not recurse into EXPR's subtrees. */
2370 unsave_expr_1 (tree expr)
2372 switch (TREE_CODE (expr))
2375 /* Don't mess with a TARGET_EXPR that hasn't been expanded.
2376 It's OK for this to happen if it was part of a subtree that
2377 isn't immediately expanded, such as operand 2 of another
2379 if (TREE_OPERAND (expr, 1))
2382 TREE_OPERAND (expr, 1) = TREE_OPERAND (expr, 3);
2383 TREE_OPERAND (expr, 3) = NULL_TREE;
2391 /* Called via walk_tree when an expression is unsaved. Using the
2392 splay_tree pointed to by ST (which is really a `splay_tree'),
2393 remaps all local declarations to appropriate replacements. */
2396 unsave_r (tree *tp, int *walk_subtrees, void *data)
2398 inline_data *id = (inline_data *) data;
2399 splay_tree st = id->decl_map;
2402 /* Only a local declaration (variable or label). */
2403 if ((TREE_CODE (*tp) == VAR_DECL && !TREE_STATIC (*tp))
2404 || TREE_CODE (*tp) == LABEL_DECL)
2406 /* Lookup the declaration. */
2407 n = splay_tree_lookup (st, (splay_tree_key) *tp);
2409 /* If it's there, remap it. */
2411 *tp = (tree) n->value;
2414 else if (TREE_CODE (*tp) == STATEMENT_LIST)
2415 copy_statement_list (tp);
2416 else if (TREE_CODE (*tp) == BIND_EXPR)
2417 copy_bind_expr (tp, walk_subtrees, id);
2418 else if (TREE_CODE (*tp) == SAVE_EXPR)
2419 remap_save_expr (tp, st, walk_subtrees);
2422 copy_tree_r (tp, walk_subtrees, NULL);
2424 /* Do whatever unsaving is required. */
2425 unsave_expr_1 (*tp);
2428 /* Keep iterating. */
2432 /* Copies everything in EXPR and replaces variables, labels
2433 and SAVE_EXPRs local to EXPR. */
2436 unsave_expr_now (tree expr)
2440 /* There's nothing to do for NULL_TREE. */
2445 memset (&id, 0, sizeof (id));
2446 VARRAY_TREE_INIT (id.fns, 1, "fns");
2447 VARRAY_PUSH_TREE (id.fns, current_function_decl);
2448 id.decl_map = splay_tree_new (splay_tree_compare_pointers, NULL, NULL);
2450 /* Walk the tree once to find local labels. */
2451 walk_tree_without_duplicates (&expr, mark_local_for_remap_r, &id);
2453 /* Walk the tree again, copying, remapping, and unsaving. */
2454 walk_tree (&expr, unsave_r, &id, NULL);
2457 splay_tree_delete (id.decl_map);
2462 /* Allow someone to determine if SEARCH is a child of TOP from gdb. */
2465 debug_find_tree_1 (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED, void *data)
2474 debug_find_tree (tree top, tree search)
2476 return walk_tree_without_duplicates (&top, debug_find_tree_1, search) != 0;
2479 /* Declare the variables created by the inliner. Add all the variables in
2480 VARS to BIND_EXPR. */
2483 declare_inline_vars (tree bind_expr, tree vars)
2486 for (t = vars; t; t = TREE_CHAIN (t))
2487 DECL_SEEN_IN_BIND_EXPR_P (t) = 1;
2489 add_var_to_bind_expr (bind_expr, vars);