1 /* Control and data flow functions for trees.
2 Copyright 2001, 2002 Free Software Foundation, Inc.
3 Contributed by Alexandre Oliva <aoliva@redhat.com>
5 This file is part of GNU CC.
7 GNU CC 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 GNU CC 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 GNU CC; 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 /* This should be eventually be generalized to other languages, but
43 this would require a shared function-as-trees infrastructure. */
44 #ifndef INLINER_FOR_JAVA
46 #else /* INLINER_FOR_JAVA */
48 #include "java-tree.h"
49 #endif /* INLINER_FOR_JAVA */
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 map from local declarations in the inlined function to
89 equivalents in the function into which it is being inlined. */
91 /* Nonzero if we are currently within the cleanup for a
93 int in_target_cleanup_p;
94 /* A list of the functions current function has inlined. */
95 varray_type inlined_fns;
96 /* The approximate number of statements we have inlined in the
97 current call stack. */
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 /* Hash table used to prevent walk_tree from visiting the same node
105 umpteen million times. */
107 /* Decl of function we are inlining into. */
113 static tree declare_return_variable PARAMS ((inline_data *, tree, tree *));
114 static tree copy_body_r PARAMS ((tree *, int *, void *));
115 static tree copy_body PARAMS ((inline_data *));
116 static tree expand_call_inline PARAMS ((tree *, int *, void *));
117 static void expand_calls_inline PARAMS ((tree *, inline_data *));
118 static int inlinable_function_p PARAMS ((tree, inline_data *, int));
119 static tree remap_decl PARAMS ((tree, inline_data *));
120 #ifndef INLINER_FOR_JAVA
121 static tree initialize_inlined_parameters PARAMS ((inline_data *, tree, tree));
122 static void remap_block PARAMS ((tree, tree, inline_data *));
123 static void copy_scope_stmt PARAMS ((tree *, int *, inline_data *));
124 #else /* INLINER_FOR_JAVA */
125 static tree initialize_inlined_parameters PARAMS ((inline_data *, tree, tree, tree));
126 static void remap_block PARAMS ((tree *, tree, inline_data *));
127 static tree add_stmt_to_compound PARAMS ((tree, tree, tree));
128 #endif /* INLINER_FOR_JAVA */
129 static tree find_alloca_call_1 PARAMS ((tree *, int *, void *));
130 static tree find_alloca_call PARAMS ((tree));
131 static tree find_builtin_longjmp_call_1 PARAMS ((tree *, int *, void *));
132 static tree find_builtin_longjmp_call PARAMS ((tree));
134 /* The approximate number of instructions per statement. This number
135 need not be particularly accurate; it is used only to make
136 decisions about when a function is too big to inline. */
137 #define INSNS_PER_STMT (10)
139 /* Remap DECL during the copying of the BLOCK tree for the function. */
142 remap_decl (decl, id)
149 /* We only remap local variables in the current function. */
150 fn = VARRAY_TOP_TREE (id->fns);
151 if (! (*lang_hooks.tree_inlining.auto_var_in_fn_p) (decl, fn))
154 /* See if we have remapped this declaration. */
155 n = splay_tree_lookup (id->decl_map, (splay_tree_key) decl);
156 /* If we didn't already have an equivalent for this declaration,
162 /* Make a copy of the variable or label. */
163 t = copy_decl_for_inlining (decl, fn,
164 VARRAY_TREE (id->fns, 0));
166 /* The decl T could be a dynamic array or other variable size type,
167 in which case some fields need to be remapped because they may
168 contain SAVE_EXPRs. */
169 if (TREE_TYPE (t) && TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE
170 && TYPE_DOMAIN (TREE_TYPE (t)))
172 TREE_TYPE (t) = copy_node (TREE_TYPE (t));
173 TYPE_DOMAIN (TREE_TYPE (t))
174 = copy_node (TYPE_DOMAIN (TREE_TYPE (t)));
175 walk_tree (&TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (t))),
176 copy_body_r, id, NULL);
179 #ifndef INLINER_FOR_JAVA
180 if (! DECL_NAME (t) && TREE_TYPE (t)
181 && (*lang_hooks.tree_inlining.anon_aggr_type_p) (TREE_TYPE (t)))
183 /* For a VAR_DECL of anonymous type, we must also copy the
184 member VAR_DECLS here and rechain the
185 DECL_ANON_UNION_ELEMS. */
189 for (src = DECL_ANON_UNION_ELEMS (t); src;
190 src = TREE_CHAIN (src))
192 tree member = remap_decl (TREE_VALUE (src), id);
194 if (TREE_PURPOSE (src))
196 members = tree_cons (NULL, member, members);
198 DECL_ANON_UNION_ELEMS (t) = nreverse (members);
200 #endif /* not INLINER_FOR_JAVA */
202 /* Remember it, so that if we encounter this local entity
203 again we can reuse this copy. */
204 n = splay_tree_insert (id->decl_map,
205 (splay_tree_key) decl,
206 (splay_tree_value) t);
209 return (tree) n->value;
212 #ifndef INLINER_FOR_JAVA
213 /* Copy the SCOPE_STMT_BLOCK associated with SCOPE_STMT to contain
214 remapped versions of the variables therein. And hook the new block
215 into the block-tree. If non-NULL, the DECLS are declarations to
216 add to use instead of the BLOCK_VARS in the old block. */
217 #else /* INLINER_FOR_JAVA */
218 /* Copy the BLOCK to contain remapped versions of the variables
219 therein. And hook the new block into the block-tree. */
220 #endif /* INLINER_FOR_JAVA */
223 #ifndef INLINER_FOR_JAVA
224 remap_block (scope_stmt, decls, id)
226 #else /* INLINER_FOR_JAVA */
227 remap_block (block, decls, id)
229 #endif /* INLINER_FOR_JAVA */
233 #ifndef INLINER_FOR_JAVA
234 /* We cannot do this in the cleanup for a TARGET_EXPR since we do
235 not know whether or not expand_expr will actually write out the
236 code we put there. If it does not, then we'll have more BLOCKs
237 than block-notes, and things will go awry. At some point, we
238 should make the back-end handle BLOCK notes in a tidier way,
239 without requiring a strict correspondence to the block-tree; then
240 this check can go. */
241 if (id->in_target_cleanup_p)
243 SCOPE_STMT_BLOCK (scope_stmt) = NULL_TREE;
247 /* If this is the beginning of a scope, remap the associated BLOCK. */
248 if (SCOPE_BEGIN_P (scope_stmt) && SCOPE_STMT_BLOCK (scope_stmt))
255 /* Make the new block. */
256 old_block = SCOPE_STMT_BLOCK (scope_stmt);
257 new_block = make_node (BLOCK);
258 TREE_USED (new_block) = TREE_USED (old_block);
259 BLOCK_ABSTRACT_ORIGIN (new_block) = old_block;
260 SCOPE_STMT_BLOCK (scope_stmt) = new_block;
262 /* Remap its variables. */
263 for (old_var = decls ? decls : BLOCK_VARS (old_block);
265 old_var = TREE_CHAIN (old_var))
269 /* Remap the variable. */
270 new_var = remap_decl (old_var, id);
271 /* If we didn't remap this variable, so we can't mess with
272 its TREE_CHAIN. If we remapped this variable to
273 something other than a declaration (say, if we mapped it
274 to a constant), then we must similarly omit any mention
276 if (!new_var || !DECL_P (new_var))
280 TREE_CHAIN (new_var) = BLOCK_VARS (new_block);
281 BLOCK_VARS (new_block) = new_var;
284 /* We put the BLOCK_VARS in reverse order; fix that now. */
285 BLOCK_VARS (new_block) = nreverse (BLOCK_VARS (new_block));
286 fn = VARRAY_TREE (id->fns, 0);
288 /* We're building a clone; DECL_INITIAL is still
289 error_mark_node, and current_binding_level is the parm
291 (*lang_hooks.decls.insert_block) (new_block);
294 /* Attach this new block after the DECL_INITIAL block for the
295 function into which this block is being inlined. In
296 rest_of_compilation we will straighten out the BLOCK tree. */
298 if (DECL_INITIAL (fn))
299 first_block = &BLOCK_CHAIN (DECL_INITIAL (fn));
301 first_block = &DECL_INITIAL (fn);
302 BLOCK_CHAIN (new_block) = *first_block;
303 *first_block = new_block;
305 /* Remember the remapped block. */
306 splay_tree_insert (id->decl_map,
307 (splay_tree_key) old_block,
308 (splay_tree_value) new_block);
310 /* If this is the end of a scope, set the SCOPE_STMT_BLOCK to be the
312 else if (SCOPE_END_P (scope_stmt) && SCOPE_STMT_BLOCK (scope_stmt))
316 /* Find this block in the table of remapped things. */
317 n = splay_tree_lookup (id->decl_map,
318 (splay_tree_key) SCOPE_STMT_BLOCK (scope_stmt));
321 SCOPE_STMT_BLOCK (scope_stmt) = (tree) n->value;
323 #else /* INLINER_FOR_JAVA */
329 /* Make the new block. */
331 new_block = make_node (BLOCK);
332 TREE_USED (new_block) = TREE_USED (old_block);
333 BLOCK_ABSTRACT_ORIGIN (new_block) = old_block;
334 BLOCK_SUBBLOCKS (new_block) = BLOCK_SUBBLOCKS (old_block);
335 TREE_SIDE_EFFECTS (new_block) = TREE_SIDE_EFFECTS (old_block);
336 TREE_TYPE (new_block) = TREE_TYPE (old_block);
339 /* Remap its variables. */
340 for (old_var = decls ? decls : BLOCK_VARS (old_block);
342 old_var = TREE_CHAIN (old_var))
346 /* All local class initialization flags go in the outermost
348 if (LOCAL_CLASS_INITIALIZATION_FLAG_P (old_var))
350 /* We may already have one. */
351 if (! splay_tree_lookup (id->decl_map, (splay_tree_key) old_var))
353 tree outermost_block;
354 new_var = remap_decl (old_var, id);
355 DECL_ABSTRACT_ORIGIN (new_var) = NULL;
356 outermost_block = DECL_SAVED_TREE (current_function_decl);
357 TREE_CHAIN (new_var) = BLOCK_VARS (outermost_block);
358 BLOCK_VARS (outermost_block) = new_var;
363 /* Remap the variable. */
364 new_var = remap_decl (old_var, id);
365 /* If we didn't remap this variable, so we can't mess with
366 its TREE_CHAIN. If we remapped this variable to
367 something other than a declaration (say, if we mapped it
368 to a constant), then we must similarly omit any mention
370 if (!new_var || !DECL_P (new_var))
374 TREE_CHAIN (new_var) = BLOCK_VARS (new_block);
375 BLOCK_VARS (new_block) = new_var;
378 /* We put the BLOCK_VARS in reverse order; fix that now. */
379 BLOCK_VARS (new_block) = nreverse (BLOCK_VARS (new_block));
380 fn = VARRAY_TREE (id->fns, 0);
381 /* Remember the remapped block. */
382 splay_tree_insert (id->decl_map,
383 (splay_tree_key) old_block,
384 (splay_tree_value) new_block);
385 #endif /* INLINER_FOR_JAVA */
388 #ifndef INLINER_FOR_JAVA
389 /* Copy the SCOPE_STMT pointed to by TP. */
392 copy_scope_stmt (tp, walk_subtrees, id)
399 /* Remember whether or not this statement was nullified. When
400 making a copy, copy_tree_r always sets SCOPE_NULLIFIED_P (and
401 doesn't copy the SCOPE_STMT_BLOCK) to free callers from having to
402 deal with copying BLOCKs if they do not wish to do so. */
403 block = SCOPE_STMT_BLOCK (*tp);
404 /* Copy (and replace) the statement. */
405 copy_tree_r (tp, walk_subtrees, NULL);
406 /* Restore the SCOPE_STMT_BLOCK. */
407 SCOPE_STMT_BLOCK (*tp) = block;
409 /* Remap the associated block. */
410 remap_block (*tp, NULL_TREE, id);
412 #endif /* not INLINER_FOR_JAVA */
414 /* Called from copy_body via walk_tree. DATA is really an
417 copy_body_r (tp, walk_subtrees, data)
426 id = (inline_data *) data;
427 fn = VARRAY_TOP_TREE (id->fns);
430 /* All automatic variables should have a DECL_CONTEXT indicating
431 what function they come from. */
432 if ((TREE_CODE (*tp) == VAR_DECL || TREE_CODE (*tp) == LABEL_DECL)
433 && DECL_NAMESPACE_SCOPE_P (*tp))
434 if (! DECL_EXTERNAL (*tp) && ! TREE_STATIC (*tp))
438 #ifdef INLINER_FOR_JAVA
439 if (TREE_CODE (*tp) == BLOCK)
440 remap_block (tp, NULL_TREE, id);
443 /* If this is a RETURN_STMT, change it into an EXPR_STMT and a
444 GOTO_STMT with the RET_LABEL as its target. */
445 #ifndef INLINER_FOR_JAVA
446 if (TREE_CODE (*tp) == RETURN_STMT && id->ret_label)
447 #else /* INLINER_FOR_JAVA */
448 if (TREE_CODE (*tp) == RETURN_EXPR && id->ret_label)
449 #endif /* INLINER_FOR_JAVA */
451 tree return_stmt = *tp;
454 /* Build the GOTO_STMT. */
455 #ifndef INLINER_FOR_JAVA
456 goto_stmt = build_stmt (GOTO_STMT, id->ret_label);
457 TREE_CHAIN (goto_stmt) = TREE_CHAIN (return_stmt);
458 GOTO_FAKE_P (goto_stmt) = 1;
459 #else /* INLINER_FOR_JAVA */
460 tree assignment = TREE_OPERAND (return_stmt, 0);
461 goto_stmt = build1 (GOTO_EXPR, void_type_node, id->ret_label);
462 TREE_SIDE_EFFECTS (goto_stmt) = 1;
463 #endif /* INLINER_FOR_JAVA */
465 /* If we're returning something, just turn that into an
466 assignment into the equivalent of the original
468 #ifndef INLINER_FOR_JAVA
469 if (RETURN_STMT_EXPR (return_stmt))
471 *tp = build_stmt (EXPR_STMT,
472 RETURN_STMT_EXPR (return_stmt));
473 STMT_IS_FULL_EXPR_P (*tp) = 1;
474 /* And then jump to the end of the function. */
475 TREE_CHAIN (*tp) = goto_stmt;
477 #else /* INLINER_FOR_JAVA */
480 copy_body_r (&assignment, walk_subtrees, data);
481 *tp = build (COMPOUND_EXPR, void_type_node, assignment, goto_stmt);
482 TREE_SIDE_EFFECTS (*tp) = 1;
484 #endif /* INLINER_FOR_JAVA */
485 /* If we're not returning anything just do the jump. */
489 /* Local variables and labels need to be replaced by equivalent
490 variables. We don't want to copy static variables; there's only
491 one of those, no matter how many times we inline the containing
493 else if ((*lang_hooks.tree_inlining.auto_var_in_fn_p) (*tp, fn))
497 /* Remap the declaration. */
498 new_decl = remap_decl (*tp, id);
501 /* Replace this variable with the copy. */
502 STRIP_TYPE_NOPS (new_decl);
506 else if (nonstatic_local_decl_p (*tp)
507 && DECL_CONTEXT (*tp) != VARRAY_TREE (id->fns, 0))
510 else if (TREE_CODE (*tp) == SAVE_EXPR)
511 remap_save_expr (tp, id->decl_map, VARRAY_TREE (id->fns, 0),
513 else if (TREE_CODE (*tp) == UNSAVE_EXPR)
514 /* UNSAVE_EXPRs should not be generated until expansion time. */
516 #ifndef INLINER_FOR_JAVA
517 /* For a SCOPE_STMT, we must copy the associated block so that we
518 can write out debugging information for the inlined variables. */
519 else if (TREE_CODE (*tp) == SCOPE_STMT && !id->in_target_cleanup_p)
520 copy_scope_stmt (tp, walk_subtrees, id);
521 #else /* INLINER_FOR_JAVA */
522 else if (TREE_CODE (*tp) == LABELED_BLOCK_EXPR)
524 /* We need a new copy of this labeled block; the EXIT_BLOCK_EXPR
525 will refer to it, so save a copy ready for remapping. We
526 save it in the decl_map, although it isn't a decl. */
527 tree new_block = copy_node (*tp);
528 splay_tree_insert (id->decl_map,
529 (splay_tree_key) *tp,
530 (splay_tree_value) new_block);
533 else if (TREE_CODE (*tp) == EXIT_BLOCK_EXPR)
536 = splay_tree_lookup (id->decl_map,
537 (splay_tree_key) TREE_OPERAND (*tp, 0));
538 /* We _must_ have seen the enclosing LABELED_BLOCK_EXPR. */
541 *tp = copy_node (*tp);
542 TREE_OPERAND (*tp, 0) = (tree) n->value;
544 #endif /* INLINER_FOR_JAVA */
545 /* Otherwise, just copy the node. Note that copy_tree_r already
546 knows not to copy VAR_DECLs, etc., so this is safe. */
549 copy_tree_r (tp, walk_subtrees, NULL);
551 /* The copied TARGET_EXPR has never been expanded, even if the
552 original node was expanded already. */
553 if (TREE_CODE (*tp) == TARGET_EXPR && TREE_OPERAND (*tp, 3))
555 TREE_OPERAND (*tp, 1) = TREE_OPERAND (*tp, 3);
556 TREE_OPERAND (*tp, 3) = NULL_TREE;
558 else if (TREE_CODE (*tp) == MODIFY_EXPR
559 && TREE_OPERAND (*tp, 0) == TREE_OPERAND (*tp, 1)
560 && ((*lang_hooks.tree_inlining.auto_var_in_fn_p)
561 (TREE_OPERAND (*tp, 0), fn)))
563 /* Some assignments VAR = VAR; don't generate any rtl code
564 and thus don't count as variable modification. Avoid
565 keeping bogosities like 0 = 0. */
566 tree decl = TREE_OPERAND (*tp, 0), value;
569 n = splay_tree_lookup (id->decl_map, (splay_tree_key) decl);
572 value = (tree) n->value;
573 STRIP_TYPE_NOPS (value);
574 if (TREE_CONSTANT (value) || TREE_READONLY_DECL_P (value))
580 /* Keep iterating. */
584 /* Make a copy of the body of FN so that it can be inserted inline in
593 body = DECL_SAVED_TREE (VARRAY_TOP_TREE (id->fns));
594 walk_tree (&body, copy_body_r, id, NULL);
599 /* Generate code to initialize the parameters of the function at the
600 top of the stack in ID from the ARGS (presented as a TREE_LIST). */
603 #ifndef INLINER_FOR_JAVA
604 initialize_inlined_parameters (id, args, fn)
605 #else /* INLINER_FOR_JAVA */
606 initialize_inlined_parameters (id, args, fn, block)
607 #endif /* INLINER_FOR_JAVA */
611 #ifdef INLINER_FOR_JAVA
613 #endif /* INLINER_FOR_JAVA */
619 #ifdef INLINER_FOR_JAVA
620 tree vars = NULL_TREE;
621 #endif /* INLINER_FOR_JAVA */
623 /* Figure out what the parameters are. */
624 parms = DECL_ARGUMENTS (fn);
626 /* Start with no initializations whatsoever. */
627 init_stmts = NULL_TREE;
629 /* Loop through the parameter declarations, replacing each with an
630 equivalent VAR_DECL, appropriately initialized. */
631 for (p = parms, a = args; p;
632 a = a ? TREE_CHAIN (a) : a, p = TREE_CHAIN (p))
634 #ifndef INLINER_FOR_JAVA
637 #endif /* not INLINER_FOR_JAVA */
642 /* Find the initializer. */
643 value = (*lang_hooks.tree_inlining.convert_parm_for_inlining)
644 (p, a ? TREE_VALUE (a) : NULL_TREE, fn);
646 /* If the parameter is never assigned to, we may not need to
647 create a new variable here at all. Instead, we may be able
648 to just use the argument value. */
649 if (TREE_READONLY (p)
650 && !TREE_ADDRESSABLE (p)
651 && value && !TREE_SIDE_EFFECTS (value))
653 /* Simplify the value, if possible. */
654 value = fold (DECL_P (value) ? decl_constant_value (value) : value);
656 /* We can't risk substituting complex expressions. They
657 might contain variables that will be assigned to later.
658 Theoretically, we could check the expression to see if
659 all of the variables that determine its value are
660 read-only, but we don't bother. */
661 if (TREE_CONSTANT (value) || TREE_READONLY_DECL_P (value))
663 /* If this is a declaration, wrap it a NOP_EXPR so that
664 we don't try to put the VALUE on the list of
667 value = build1 (NOP_EXPR, TREE_TYPE (value), value);
669 splay_tree_insert (id->decl_map,
671 (splay_tree_value) value);
676 /* Make an equivalent VAR_DECL. */
677 var = copy_decl_for_inlining (p, fn, VARRAY_TREE (id->fns, 0));
679 /* See if the frontend wants to pass this by invisible reference. If
680 so, our new VAR_DECL will have REFERENCE_TYPE, and we need to
681 replace uses of the PARM_DECL with dereferences. */
682 if (TREE_TYPE (var) != TREE_TYPE (p)
683 && POINTER_TYPE_P (TREE_TYPE (var))
684 && TREE_TYPE (TREE_TYPE (var)) == TREE_TYPE (p))
685 var_sub = build1 (INDIRECT_REF, TREE_TYPE (p), var);
689 /* Register the VAR_DECL as the equivalent for the PARM_DECL;
690 that way, when the PARM_DECL is encountered, it will be
691 automatically replaced by the VAR_DECL. */
692 splay_tree_insert (id->decl_map,
694 (splay_tree_value) var_sub);
696 /* Declare this new variable. */
697 #ifndef INLINER_FOR_JAVA
698 init_stmt = build_stmt (DECL_STMT, var);
699 TREE_CHAIN (init_stmt) = init_stmts;
700 init_stmts = init_stmt;
701 #else /* INLINER_FOR_JAVA */
702 TREE_CHAIN (var) = vars;
704 #endif /* INLINER_FOR_JAVA */
706 /* Initialize this VAR_DECL from the equivalent argument. If
707 the argument is an object, created via a constructor or copy,
708 this will not result in an extra copy: the TARGET_EXPR
709 representing the argument will be bound to VAR, and the
710 object will be constructed in VAR. */
711 if (! TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (p)))
712 #ifndef INLINER_FOR_JAVA
713 DECL_INITIAL (var) = value;
716 /* Even if P was TREE_READONLY, the new VAR should not be.
717 In the original code, we would have constructed a
718 temporary, and then the function body would have never
719 changed the value of P. However, now, we will be
720 constructing VAR directly. The constructor body may
721 change its value multiple times as it is being
722 constructed. Therefore, it must not be TREE_READONLY;
723 the back-end assumes that TREE_READONLY variable is
724 assigned to only once. */
725 TREE_READONLY (var) = 0;
727 /* Build a run-time initialization. */
728 init_stmt = build_stmt (EXPR_STMT,
729 build (INIT_EXPR, TREE_TYPE (p),
731 /* Add this initialization to the list. Note that we want the
732 declaration *after* the initialization because we are going
733 to reverse all the initialization statements below. */
734 TREE_CHAIN (init_stmt) = init_stmts;
735 init_stmts = init_stmt;
738 /* See if we need to clean up the declaration. */
739 cleanup = (*lang_hooks.maybe_build_cleanup) (var);
743 /* Build the cleanup statement. */
744 cleanup_stmt = build_stmt (CLEANUP_STMT, var, cleanup);
745 /* Add it to the *front* of the list; the list will be
747 TREE_CHAIN (cleanup_stmt) = init_stmts;
748 init_stmts = cleanup_stmt;
750 #else /* INLINER_FOR_JAVA */
752 tree assignment = build (MODIFY_EXPR, TREE_TYPE (p), var, value);
753 init_stmts = add_stmt_to_compound (init_stmts, TREE_TYPE (p),
758 /* Java objects don't ever need constructing when being
759 passed as arguments because only call by reference is
763 #endif /* INLINER_FOR_JAVA */
766 #ifndef INLINER_FOR_JAVA
767 /* Evaluate trailing arguments. */
768 for (; a; a = TREE_CHAIN (a))
771 tree value = TREE_VALUE (a);
773 if (! value || ! TREE_SIDE_EFFECTS (value))
776 init_stmt = build_stmt (EXPR_STMT, value);
777 TREE_CHAIN (init_stmt) = init_stmts;
778 init_stmts = init_stmt;
781 /* The initialization statements have been built up in reverse
782 order. Straighten them out now. */
783 return nreverse (init_stmts);
784 #else /* INLINER_FOR_JAVA */
785 BLOCK_VARS (block) = nreverse (vars);
787 #endif /* INLINER_FOR_JAVA */
790 /* Declare a return variable to replace the RESULT_DECL for the
791 function we are calling. An appropriate DECL_STMT is returned.
792 The USE_STMT is filled in to contain a use of the declaration to
793 indicate the return value of the function. */
795 #ifndef INLINER_FOR_JAVA
797 declare_return_variable (id, return_slot_addr, use_stmt)
798 struct inline_data *id;
799 tree return_slot_addr;
801 #else /* INLINER_FOR_JAVA */
803 declare_return_variable (id, return_slot_addr, var)
804 struct inline_data *id;
805 tree return_slot_addr;
807 #endif /* INLINER_FOR_JAVA */
809 tree fn = VARRAY_TOP_TREE (id->fns);
810 tree result = DECL_RESULT (fn);
811 #ifndef INLINER_FOR_JAVA
813 #endif /* not INLINER_FOR_JAVA */
814 int need_return_decl = 1;
816 /* We don't need to do anything for functions that don't return
818 if (!result || VOID_TYPE_P (TREE_TYPE (result)))
820 #ifndef INLINER_FOR_JAVA
821 *use_stmt = NULL_TREE;
822 #else /* INLINER_FOR_JAVA */
824 #endif /* INLINER_FOR_JAVA */
828 #ifndef INLINER_FOR_JAVA
829 var = ((*lang_hooks.tree_inlining.copy_res_decl_for_inlining)
830 (result, fn, VARRAY_TREE (id->fns, 0), id->decl_map,
831 &need_return_decl, return_slot_addr));
833 /* Register the VAR_DECL as the equivalent for the RESULT_DECL; that
834 way, when the RESULT_DECL is encountered, it will be
835 automatically replaced by the VAR_DECL. */
836 splay_tree_insert (id->decl_map,
837 (splay_tree_key) result,
838 (splay_tree_value) var);
840 /* Build the USE_STMT. If the return type of the function was
841 promoted, convert it back to the expected type. */
842 if (TREE_TYPE (var) == TREE_TYPE (TREE_TYPE (fn)))
843 *use_stmt = build_stmt (EXPR_STMT, var);
845 *use_stmt = build_stmt (EXPR_STMT,
846 build1 (NOP_EXPR, TREE_TYPE (TREE_TYPE (fn)),
848 TREE_ADDRESSABLE (*use_stmt) = 1;
850 /* Build the declaration statement if FN does not return an
852 if (need_return_decl)
853 return build_stmt (DECL_STMT, var);
854 #else /* INLINER_FOR_JAVA */
855 *var = ((*lang_hooks.tree_inlining.copy_res_decl_for_inlining)
856 (result, fn, VARRAY_TREE (id->fns, 0), id->decl_map,
857 &need_return_decl, return_slot_addr));
859 splay_tree_insert (id->decl_map,
860 (splay_tree_key) result,
861 (splay_tree_value) *var);
862 DECL_IGNORED_P (*var) = 1;
863 if (need_return_decl)
865 #endif /* INLINER_FOR_JAVA */
866 /* If FN does return an aggregate, there's no need to declare the
867 return variable; we're using a variable in our caller's frame. */
872 /* Returns nonzero if a function can be inlined as a tree. */
875 tree_inlinable_function_p (fn, nolimit)
879 return inlinable_function_p (fn, NULL, nolimit);
882 /* If *TP is possibly call to alloca, return nonzero. */
884 find_alloca_call_1 (tp, walk_subtrees, data)
886 int *walk_subtrees ATTRIBUTE_UNUSED;
887 void *data ATTRIBUTE_UNUSED;
889 if (alloca_call_p (*tp))
894 /* Return subexpression representing possible alloca call, if any. */
896 find_alloca_call (exp)
900 const char *file = input_filename;
901 tree ret = walk_tree (&exp, find_alloca_call_1, NULL, NULL);
903 input_filename = file;
908 find_builtin_longjmp_call_1 (tp, walk_subtrees, data)
910 int *walk_subtrees ATTRIBUTE_UNUSED;
911 void *data ATTRIBUTE_UNUSED;
913 tree exp = *tp, decl;
915 if (TREE_CODE (exp) == CALL_EXPR
916 && TREE_CODE (TREE_OPERAND (exp, 0)) == ADDR_EXPR
917 && (decl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0),
918 TREE_CODE (decl) == FUNCTION_DECL)
919 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL
920 && DECL_FUNCTION_CODE (decl) == BUILT_IN_LONGJMP)
927 find_builtin_longjmp_call (exp)
931 const char *file = input_filename;
932 tree ret = walk_tree (&exp, find_builtin_longjmp_call_1, NULL, NULL);
934 input_filename = file;
938 /* Returns nonzero if FN is a function that can be inlined into the
939 inlining context ID_. If ID_ is NULL, check whether the function
940 can be inlined at all. */
943 inlinable_function_p (fn, id, nolimit)
950 int max_inline_insns_single = MAX_INLINE_INSNS_SINGLE;
952 /* If we've already decided this function shouldn't be inlined,
953 there's no need to check again. */
954 if (DECL_UNINLINABLE (fn))
957 /* Assume it is not inlinable. */
960 /* We may be here either because fn is declared inline or because
961 we use -finline-functions. For the second case, we are more
963 if (DID_INLINE_FUNC (fn))
964 max_inline_insns_single = MAX_INLINE_INSNS_AUTO;
966 /* The number of instructions (estimated) of current function. */
967 currfn_insns = DECL_NUM_STMTS (fn) * INSNS_PER_STMT;
969 /* If we're not inlining things, then nothing is inlinable. */
970 if (! flag_inline_trees)
972 /* If we're not inlining all functions and the function was not
973 declared `inline', we don't inline it. Don't think of
974 disregarding DECL_INLINE when flag_inline_trees == 2; it's the
975 front-end that must set DECL_INLINE in this case, because
976 dwarf2out loses if a function is inlined that doesn't have
978 else if (! DECL_INLINE (fn) && !nolimit)
980 /* We can't inline functions that are too big. Only allow a single
981 function to be of MAX_INLINE_INSNS_SINGLE size. Make special
982 allowance for extern inline functions, though. */
984 && ! (*lang_hooks.tree_inlining.disregard_inline_limits) (fn)
985 && currfn_insns > max_inline_insns_single)
987 /* We can't inline functions that call __builtin_longjmp at all.
988 The non-local goto machenery really requires the destination
989 be in a different function. If we allow the function calling
990 __builtin_longjmp to be inlined into the function calling
991 __builtin_setjmp, Things will Go Awry. */
992 /* ??? Need front end help to identify "regular" non-local goto. */
993 else if (find_builtin_longjmp_call (DECL_SAVED_TREE (fn)))
995 /* Refuse to inline alloca call unless user explicitly forced so as this may
996 change program's memory overhead drastically when the function using alloca
997 is called in loop. In GCC present in SPEC2000 inlining into schedule_block
998 cause it to require 2GB of ram instead of 256MB. */
999 else if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (fn)) == NULL
1000 && find_alloca_call (DECL_SAVED_TREE (fn)))
1002 /* All is well. We can inline this function. Traditionally, GCC
1003 has refused to inline functions using alloca, or functions whose
1004 values are returned in a PARALLEL, and a few other such obscure
1005 conditions. We are not equally constrained at the tree level. */
1009 /* Squirrel away the result so that we don't have to check again. */
1010 DECL_UNINLINABLE (fn) = ! inlinable;
1012 /* In case we don't disregard the inlining limits and we basically
1013 can inline this function, investigate further. */
1014 if (! (*lang_hooks.tree_inlining.disregard_inline_limits) (fn)
1015 && inlinable && !nolimit)
1017 int sum_insns = (id ? id->inlined_stmts : 0) * INSNS_PER_STMT
1019 /* In the extreme case that we have exceeded the recursive inlining
1020 limit by a huge factor (128), we just say no. Should not happen
1022 if (sum_insns > MAX_INLINE_INSNS * 128)
1024 /* If we did not hit the extreme limit, we use a linear function
1025 with slope -1/MAX_INLINE_SLOPE to exceedingly decrease the
1026 allowable size. We always allow a size of MIN_INLINE_INSNS
1028 else if ((sum_insns > MAX_INLINE_INSNS)
1029 && (currfn_insns > MIN_INLINE_INSNS))
1031 int max_curr = MAX_INLINE_INSNS_SINGLE
1032 - (sum_insns - MAX_INLINE_INSNS) / MAX_INLINE_SLOPE;
1033 if (currfn_insns > max_curr)
1038 if (inlinable && (*lang_hooks.tree_inlining.cannot_inline_tree_fn) (&fn))
1041 /* If we don't have the function body available, we can't inline
1043 if (! DECL_SAVED_TREE (fn))
1046 /* Check again, language hooks may have modified it. */
1047 if (! inlinable || DECL_UNINLINABLE (fn))
1050 /* Don't do recursive inlining, either. We don't record this in
1051 DECL_UNINLINABLE; we may be able to inline this function later. */
1056 for (i = 0; i < VARRAY_ACTIVE_SIZE (id->fns); ++i)
1057 if (VARRAY_TREE (id->fns, i) == fn)
1060 if (DECL_INLINED_FNS (fn))
1063 tree inlined_fns = DECL_INLINED_FNS (fn);
1065 for (j = 0; j < TREE_VEC_LENGTH (inlined_fns); ++j)
1066 if (TREE_VEC_ELT (inlined_fns, j) == VARRAY_TREE (id->fns, 0))
1071 /* Return the result. */
1075 /* If *TP is a CALL_EXPR, replace it with its inline expansion. */
1078 expand_call_inline (tp, walk_subtrees, data)
1087 #ifndef INLINER_FOR_JAVA
1091 #else /* INLINER_FOR_JAVA */
1093 #endif /* INLINER_FOR_JAVA */
1099 tree return_slot_addr;
1101 /* See what we've got. */
1102 id = (inline_data *) data;
1105 /* Recurse, but letting recursive invocations know that we are
1106 inside the body of a TARGET_EXPR. */
1107 if (TREE_CODE (*tp) == TARGET_EXPR)
1109 #ifndef INLINER_FOR_JAVA
1110 int i, len = first_rtl_op (TARGET_EXPR);
1112 /* We're walking our own subtrees. */
1115 /* Actually walk over them. This loop is the body of
1116 walk_trees, omitting the case where the TARGET_EXPR
1117 itself is handled. */
1118 for (i = 0; i < len; ++i)
1121 ++id->in_target_cleanup_p;
1122 walk_tree (&TREE_OPERAND (*tp, i), expand_call_inline, data,
1125 --id->in_target_cleanup_p;
1129 #else /* INLINER_FOR_JAVA */
1131 #endif /* INLINER_FOR_JAVA */
1135 /* Because types were not copied in copy_body, CALL_EXPRs beneath
1136 them should not be expanded. This can happen if the type is a
1137 dynamic array type, for example. */
1140 /* From here on, we're only interested in CALL_EXPRs. */
1141 if (TREE_CODE (t) != CALL_EXPR)
1144 /* First, see if we can figure out what function is being called.
1145 If we cannot, then there is no hope of inlining the function. */
1146 fn = get_callee_fndecl (t);
1150 /* If fn is a declaration of a function in a nested scope that was
1151 globally declared inline, we don't set its DECL_INITIAL.
1152 However, we can't blindly follow DECL_ABSTRACT_ORIGIN because the
1153 C++ front-end uses it for cdtors to refer to their internal
1154 declarations, that are not real functions. Fortunately those
1155 don't have trees to be saved, so we can tell by checking their
1157 if (! DECL_INITIAL (fn)
1158 && DECL_ABSTRACT_ORIGIN (fn)
1159 && DECL_SAVED_TREE (DECL_ABSTRACT_ORIGIN (fn)))
1160 fn = DECL_ABSTRACT_ORIGIN (fn);
1162 /* Don't try to inline functions that are not well-suited to
1164 if ((!flag_unit_at_a_time || !DECL_SAVED_TREE (fn)
1165 || !cgraph_global_info (fn)->inline_once)
1166 && !inlinable_function_p (fn, id, 0))
1169 if (! (*lang_hooks.tree_inlining.start_inlining) (fn))
1172 /* Set the current filename and line number to the function we are
1173 inlining so that when we create new _STMT nodes here they get
1174 line numbers corresponding to the function we are calling. We
1175 wrap the whole inlined body in an EXPR_WITH_FILE_AND_LINE as well
1176 because individual statements don't record the filename. */
1177 push_srcloc (DECL_SOURCE_FILE (fn), DECL_SOURCE_LINE (fn));
1179 #ifndef INLINER_FOR_JAVA
1180 /* Build a statement-expression containing code to initialize the
1181 arguments, the actual inline expansion of the body, and a label
1182 for the return statements within the function to jump to. The
1183 type of the statement expression is the return type of the
1185 expr = build1 (STMT_EXPR, TREE_TYPE (TREE_TYPE (fn)), make_node (COMPOUND_STMT));
1186 /* There is no scope associated with the statement-expression. */
1187 STMT_EXPR_NO_SCOPE (expr) = 1;
1188 stmt = STMT_EXPR_STMT (expr);
1189 #else /* INLINER_FOR_JAVA */
1190 /* Build a block containing code to initialize the arguments, the
1191 actual inline expansion of the body, and a label for the return
1192 statements within the function to jump to. The type of the
1193 statement expression is the return type of the function call. */
1195 expr = build (BLOCK, TREE_TYPE (TREE_TYPE (fn)), stmt);
1196 #endif /* INLINER_FOR_JAVA */
1198 /* Local declarations will be replaced by their equivalents in this
1201 id->decl_map = splay_tree_new (splay_tree_compare_pointers,
1204 /* Initialize the parameters. */
1205 args = TREE_OPERAND (t, 1);
1206 return_slot_addr = NULL_TREE;
1207 if (CALL_EXPR_HAS_RETURN_SLOT_ADDR (t))
1209 return_slot_addr = TREE_VALUE (args);
1210 args = TREE_CHAIN (args);
1213 #ifndef INLINER_FOR_JAVA
1214 arg_inits = initialize_inlined_parameters (id, args, fn);
1215 /* Expand any inlined calls in the initializers. Do this before we
1216 push FN on the stack of functions we are inlining; we want to
1217 inline calls to FN that appear in the initializers for the
1219 expand_calls_inline (&arg_inits, id);
1220 /* And add them to the tree. */
1221 COMPOUND_BODY (stmt) = chainon (COMPOUND_BODY (stmt), arg_inits);
1222 #else /* INLINER_FOR_JAVA */
1223 arg_inits = initialize_inlined_parameters (id, args, fn, expr);
1226 /* Expand any inlined calls in the initializers. Do this before we
1227 push FN on the stack of functions we are inlining; we want to
1228 inline calls to FN that appear in the initializers for the
1230 expand_calls_inline (&arg_inits, id);
1232 /* And add them to the tree. */
1233 BLOCK_EXPR_BODY (expr) = add_stmt_to_compound (BLOCK_EXPR_BODY (expr),
1234 TREE_TYPE (arg_inits),
1237 #endif /* INLINER_FOR_JAVA */
1239 /* Record the function we are about to inline so that we can avoid
1240 recursing into it. */
1241 VARRAY_PUSH_TREE (id->fns, fn);
1243 /* Record the function we are about to inline if optimize_function
1244 has not been called on it yet and we don't have it in the list. */
1245 if (! DECL_INLINED_FNS (fn))
1249 for (i = VARRAY_ACTIVE_SIZE (id->inlined_fns) - 1; i >= 0; i--)
1250 if (VARRAY_TREE (id->inlined_fns, i) == fn)
1253 VARRAY_PUSH_TREE (id->inlined_fns, fn);
1256 /* Return statements in the function body will be replaced by jumps
1257 to the RET_LABEL. */
1258 id->ret_label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
1259 DECL_CONTEXT (id->ret_label) = VARRAY_TREE (id->fns, 0);
1261 if (! DECL_INITIAL (fn)
1262 || TREE_CODE (DECL_INITIAL (fn)) != BLOCK)
1265 #ifndef INLINER_FOR_JAVA
1266 /* Create a block to put the parameters in. We have to do this
1267 after the parameters have been remapped because remapping
1268 parameters is different from remapping ordinary variables. */
1269 scope_stmt = build_stmt (SCOPE_STMT, DECL_INITIAL (fn));
1270 SCOPE_BEGIN_P (scope_stmt) = 1;
1271 SCOPE_NO_CLEANUPS_P (scope_stmt) = 1;
1272 remap_block (scope_stmt, DECL_ARGUMENTS (fn), id);
1273 TREE_CHAIN (scope_stmt) = COMPOUND_BODY (stmt);
1274 COMPOUND_BODY (stmt) = scope_stmt;
1276 /* Tell the debugging backends that this block represents the
1277 outermost scope of the inlined function. */
1278 if (SCOPE_STMT_BLOCK (scope_stmt))
1279 BLOCK_ABSTRACT_ORIGIN (SCOPE_STMT_BLOCK (scope_stmt)) = DECL_ORIGIN (fn);
1281 /* Declare the return variable for the function. */
1282 COMPOUND_BODY (stmt)
1283 = chainon (COMPOUND_BODY (stmt),
1284 declare_return_variable (id, return_slot_addr, &use_stmt));
1285 #else /* INLINER_FOR_JAVA */
1287 /* Declare the return variable for the function. */
1288 tree decl = declare_return_variable (id, return_slot_addr, &retvar);
1291 tree *next = &BLOCK_VARS (expr);
1293 next = &TREE_CHAIN (*next);
1297 #endif /* INLINER_FOR_JAVA */
1299 /* After we've initialized the parameters, we insert the body of the
1301 #ifndef INLINER_FOR_JAVA
1302 inlined_body = &COMPOUND_BODY (stmt);
1303 while (*inlined_body)
1304 inlined_body = &TREE_CHAIN (*inlined_body);
1305 *inlined_body = copy_body (id);
1306 #else /* INLINER_FOR_JAVA */
1309 java_inlining_map_static_initializers (fn, id->decl_map);
1310 new_body = copy_body (id);
1311 TREE_TYPE (new_body) = TREE_TYPE (TREE_TYPE (fn));
1312 BLOCK_EXPR_BODY (expr)
1313 = add_stmt_to_compound (BLOCK_EXPR_BODY (expr),
1314 TREE_TYPE (new_body), new_body);
1315 inlined_body = &BLOCK_EXPR_BODY (expr);
1317 #endif /* INLINER_FOR_JAVA */
1319 /* After the body of the function comes the RET_LABEL. This must come
1320 before we evaluate the returned value below, because that evaluation
1321 may cause RTL to be generated. */
1322 #ifndef INLINER_FOR_JAVA
1323 COMPOUND_BODY (stmt)
1324 = chainon (COMPOUND_BODY (stmt),
1325 build_stmt (LABEL_STMT, id->ret_label));
1326 #else /* INLINER_FOR_JAVA */
1328 tree label = build1 (LABEL_EXPR, void_type_node, id->ret_label);
1329 BLOCK_EXPR_BODY (expr)
1330 = add_stmt_to_compound (BLOCK_EXPR_BODY (expr), void_type_node, label);
1331 TREE_SIDE_EFFECTS (label) = TREE_SIDE_EFFECTS (t);
1333 #endif /* INLINER_FOR_JAVA */
1335 /* Finally, mention the returned value so that the value of the
1336 statement-expression is the returned value of the function. */
1337 #ifndef INLINER_FOR_JAVA
1338 COMPOUND_BODY (stmt) = chainon (COMPOUND_BODY (stmt), use_stmt);
1340 /* Close the block for the parameters. */
1341 scope_stmt = build_stmt (SCOPE_STMT, DECL_INITIAL (fn));
1342 SCOPE_NO_CLEANUPS_P (scope_stmt) = 1;
1343 remap_block (scope_stmt, NULL_TREE, id);
1344 COMPOUND_BODY (stmt)
1345 = chainon (COMPOUND_BODY (stmt), scope_stmt);
1346 #else /* INLINER_FOR_JAVA */
1349 /* Mention the retvar. If the return type of the function was
1350 promoted, convert it back to the expected type. */
1351 if (TREE_TYPE (TREE_TYPE (fn)) != TREE_TYPE (retvar))
1352 retvar = build1 (NOP_EXPR, TREE_TYPE (TREE_TYPE (fn)), retvar);
1353 BLOCK_EXPR_BODY (expr)
1354 = add_stmt_to_compound (BLOCK_EXPR_BODY (expr),
1355 TREE_TYPE (retvar), retvar);
1358 java_inlining_merge_static_initializers (fn, id->decl_map);
1359 #endif /* INLINER_FOR_JAVA */
1362 splay_tree_delete (id->decl_map);
1365 /* The new expression has side-effects if the old one did. */
1366 TREE_SIDE_EFFECTS (expr) = TREE_SIDE_EFFECTS (t);
1368 /* Replace the call by the inlined body. Wrap it in an
1369 EXPR_WITH_FILE_LOCATION so that we'll get debugging line notes
1370 pointing to the right place. */
1371 #ifndef INLINER_FOR_JAVA
1372 chain = TREE_CHAIN (*tp);
1373 *tp = build_expr_wfl (expr, DECL_SOURCE_FILE (fn), DECL_SOURCE_LINE (fn),
1375 #else /* INLINER_FOR_JAVA */
1376 *tp = build_expr_wfl (expr, DECL_SOURCE_FILE (fn),
1377 DECL_SOURCE_LINE_FIRST(fn),
1379 #endif /* INLINER_FOR_JAVA */
1380 EXPR_WFL_EMIT_LINE_NOTE (*tp) = 1;
1381 #ifndef INLINER_FOR_JAVA
1382 TREE_CHAIN (*tp) = chain;
1383 #endif /* not INLINER_FOR_JAVA */
1386 /* If the value of the new expression is ignored, that's OK. We
1387 don't warn about this for CALL_EXPRs, so we shouldn't warn about
1388 the equivalent inlined version either. */
1389 TREE_USED (*tp) = 1;
1391 /* Our function now has more statements than it did before. */
1392 DECL_NUM_STMTS (VARRAY_TREE (id->fns, 0)) += DECL_NUM_STMTS (fn);
1393 /* For accounting, subtract one for the saved call/ret. */
1394 id->inlined_stmts += DECL_NUM_STMTS (fn) - 1;
1396 /* Update callgraph if needed. */
1397 if (id->decl && flag_unit_at_a_time)
1399 cgraph_remove_call (id->decl, fn);
1400 cgraph_create_edges (id->decl, *inlined_body);
1403 /* Recurse into the body of the just inlined function. */
1404 expand_calls_inline (inlined_body, id);
1405 VARRAY_POP (id->fns);
1407 /* If we've returned to the top level, clear out the record of how
1408 much inlining has been done. */
1409 if (VARRAY_ACTIVE_SIZE (id->fns) == id->first_inlined_fn)
1410 id->inlined_stmts = 0;
1412 /* Don't walk into subtrees. We've already handled them above. */
1415 (*lang_hooks.tree_inlining.end_inlining) (fn);
1417 /* Keep iterating. */
1420 /* Walk over the entire tree *TP, replacing CALL_EXPRs with inline
1421 expansions as appropriate. */
1424 expand_calls_inline (tp, id)
1428 /* Search through *TP, replacing all calls to inline functions by
1429 appropriate equivalents. Use walk_tree in no-duplicates mode
1430 to avoid exponential time complexity. (We can't just use
1431 walk_tree_without_duplicates, because of the special TARGET_EXPR
1432 handling in expand_calls. The hash table is set up in
1433 optimize_function. */
1434 walk_tree (tp, expand_call_inline, id, id->tree_pruner);
1437 /* Expand calls to inline functions in the body of FN. */
1440 optimize_inline_calls (fn)
1447 memset (&id, 0, sizeof (id));
1450 /* Don't allow recursion into FN. */
1451 VARRAY_TREE_INIT (id.fns, 32, "fns");
1452 VARRAY_PUSH_TREE (id.fns, fn);
1453 /* Or any functions that aren't finished yet. */
1454 prev_fn = NULL_TREE;
1455 if (current_function_decl)
1457 VARRAY_PUSH_TREE (id.fns, current_function_decl);
1458 prev_fn = current_function_decl;
1461 prev_fn = ((*lang_hooks.tree_inlining.add_pending_fn_decls)
1462 (&id.fns, prev_fn));
1464 /* Create the list of functions this call will inline. */
1465 VARRAY_TREE_INIT (id.inlined_fns, 32, "inlined_fns");
1467 /* Keep track of the low-water mark, i.e., the point where the first
1468 real inlining is represented in ID.FNS. */
1469 id.first_inlined_fn = VARRAY_ACTIVE_SIZE (id.fns);
1471 /* Replace all calls to inline functions with the bodies of those
1473 id.tree_pruner = htab_create (37, htab_hash_pointer,
1474 htab_eq_pointer, NULL);
1475 expand_calls_inline (&DECL_SAVED_TREE (fn), &id);
1478 htab_delete (id.tree_pruner);
1479 if (DECL_LANG_SPECIFIC (fn))
1481 tree ifn = make_tree_vec (VARRAY_ACTIVE_SIZE (id.inlined_fns));
1483 if (VARRAY_ACTIVE_SIZE (id.inlined_fns))
1484 memcpy (&TREE_VEC_ELT (ifn, 0), &VARRAY_TREE (id.inlined_fns, 0),
1485 VARRAY_ACTIVE_SIZE (id.inlined_fns) * sizeof (tree));
1486 DECL_INLINED_FNS (fn) = ifn;
1490 /* FN is a function that has a complete body, and CLONE is a function
1491 whose body is to be set to a copy of FN, mapping argument
1492 declarations according to the ARG_MAP splay_tree. */
1495 clone_body (clone, fn, arg_map)
1501 /* Clone the body, as if we were making an inline call. But, remap
1502 the parameters in the callee to the parameters of caller. If
1503 there's an in-charge parameter, map it to an appropriate
1505 memset (&id, 0, sizeof (id));
1506 VARRAY_TREE_INIT (id.fns, 2, "fns");
1507 VARRAY_PUSH_TREE (id.fns, clone);
1508 VARRAY_PUSH_TREE (id.fns, fn);
1509 id.decl_map = (splay_tree)arg_map;
1511 /* Cloning is treated slightly differently from inlining. Set
1512 CLONING_P so that it's clear which operation we're performing. */
1513 id.cloning_p = true;
1515 /* Actually copy the body. */
1516 TREE_CHAIN (DECL_SAVED_TREE (clone)) = copy_body (&id);
1519 /* Apply FUNC to all the sub-trees of TP in a pre-order traversal.
1520 FUNC is called with the DATA and the address of each sub-tree. If
1521 FUNC returns a non-NULL value, the traversal is aborted, and the
1522 value returned by FUNC is returned. If HTAB is non-NULL it is used
1523 to record the nodes visited, and to avoid visiting a node more than
1527 walk_tree (tp, func, data, htab_)
1533 htab_t htab = (htab_t) htab_;
1534 enum tree_code code;
1538 #define WALK_SUBTREE(NODE) \
1541 result = walk_tree (&(NODE), func, data, htab); \
1547 #define WALK_SUBTREE_TAIL(NODE) \
1551 goto tail_recurse; \
1556 /* Skip empty subtrees. */
1564 /* Don't walk the same tree twice, if the user has requested
1565 that we avoid doing so. */
1566 slot = htab_find_slot (htab, *tp, INSERT);
1572 /* Call the function. */
1574 result = (*func) (tp, &walk_subtrees, data);
1576 /* If we found something, return it. */
1580 code = TREE_CODE (*tp);
1582 #ifndef INLINER_FOR_JAVA
1583 /* Even if we didn't, FUNC may have decided that there was nothing
1584 interesting below this point in the tree. */
1587 if (statement_code_p (code) || code == TREE_LIST
1588 || (*lang_hooks.tree_inlining.tree_chain_matters_p) (*tp))
1589 /* But we still need to check our siblings. */
1590 WALK_SUBTREE_TAIL (TREE_CHAIN (*tp));
1595 /* Handle common cases up front. */
1596 if (IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (code))
1597 || TREE_CODE_CLASS (code) == 'r'
1598 || TREE_CODE_CLASS (code) == 's')
1599 #else /* INLINER_FOR_JAVA */
1600 if (code != EXIT_BLOCK_EXPR
1601 && code != SAVE_EXPR
1602 && (IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (code))
1603 || TREE_CODE_CLASS (code) == 'r'
1604 || TREE_CODE_CLASS (code) == 's'))
1605 #endif /* INLINER_FOR_JAVA */
1609 #ifndef INLINER_FOR_JAVA
1610 /* Set lineno here so we get the right instantiation context
1611 if we call instantiate_decl from inlinable_function_p. */
1612 if (statement_code_p (code) && !STMT_LINENO_FOR_FN_P (*tp))
1613 lineno = STMT_LINENO (*tp);
1614 #endif /* not INLINER_FOR_JAVA */
1616 /* Walk over all the sub-trees of this operand. */
1617 len = first_rtl_op (code);
1618 /* TARGET_EXPRs are peculiar: operands 1 and 3 can be the same.
1619 But, we only want to walk once. */
1620 if (code == TARGET_EXPR
1621 && TREE_OPERAND (*tp, 3) == TREE_OPERAND (*tp, 1))
1623 /* Go through the subtrees. We need to do this in forward order so
1624 that the scope of a FOR_EXPR is handled properly. */
1625 for (i = 0; i < len; ++i)
1626 WALK_SUBTREE (TREE_OPERAND (*tp, i));
1628 #ifndef INLINER_FOR_JAVA
1629 /* For statements, we also walk the chain so that we cover the
1630 entire statement tree. */
1631 if (statement_code_p (code))
1633 if (code == DECL_STMT
1634 && DECL_STMT_DECL (*tp)
1635 && DECL_P (DECL_STMT_DECL (*tp)))
1637 /* Walk the DECL_INITIAL and DECL_SIZE. We don't want to walk
1638 into declarations that are just mentioned, rather than
1639 declared; they don't really belong to this part of the tree.
1640 And, we can see cycles: the initializer for a declaration can
1641 refer to the declaration itself. */
1642 WALK_SUBTREE (DECL_INITIAL (DECL_STMT_DECL (*tp)));
1643 WALK_SUBTREE (DECL_SIZE (DECL_STMT_DECL (*tp)));
1644 WALK_SUBTREE (DECL_SIZE_UNIT (DECL_STMT_DECL (*tp)));
1647 /* This can be tail-recursion optimized if we write it this way. */
1648 WALK_SUBTREE_TAIL (TREE_CHAIN (*tp));
1651 #endif /* not INLINER_FOR_JAVA */
1652 /* We didn't find what we were looking for. */
1655 else if (TREE_CODE_CLASS (code) == 'd')
1657 WALK_SUBTREE_TAIL (TREE_TYPE (*tp));
1659 else if (TREE_CODE_CLASS (code) == 't')
1661 WALK_SUBTREE (TYPE_SIZE (*tp));
1662 WALK_SUBTREE (TYPE_SIZE_UNIT (*tp));
1663 /* Also examine various special fields, below. */
1666 result = (*lang_hooks.tree_inlining.walk_subtrees) (tp, &walk_subtrees, func,
1668 if (result || ! walk_subtrees)
1671 /* Not one of the easy cases. We must explicitly go through the
1676 case IDENTIFIER_NODE:
1691 /* None of thse have subtrees other than those already walked
1696 case REFERENCE_TYPE:
1697 WALK_SUBTREE_TAIL (TREE_TYPE (*tp));
1701 WALK_SUBTREE (TREE_VALUE (*tp));
1702 WALK_SUBTREE_TAIL (TREE_CHAIN (*tp));
1707 int len = TREE_VEC_LENGTH (*tp);
1712 /* Walk all elements but the first. */
1714 WALK_SUBTREE (TREE_VEC_ELT (*tp, len));
1716 /* Now walk the first one as a tail call. */
1717 WALK_SUBTREE_TAIL (TREE_VEC_ELT (*tp, 0));
1721 WALK_SUBTREE (TREE_REALPART (*tp));
1722 WALK_SUBTREE_TAIL (TREE_IMAGPART (*tp));
1725 WALK_SUBTREE_TAIL (CONSTRUCTOR_ELTS (*tp));
1728 WALK_SUBTREE (TYPE_METHOD_BASETYPE (*tp));
1732 WALK_SUBTREE (TREE_TYPE (*tp));
1734 tree arg = TYPE_ARG_TYPES (*tp);
1736 /* We never want to walk into default arguments. */
1737 for (; arg; arg = TREE_CHAIN (arg))
1738 WALK_SUBTREE (TREE_VALUE (arg));
1743 WALK_SUBTREE (TREE_TYPE (*tp));
1744 WALK_SUBTREE_TAIL (TYPE_DOMAIN (*tp));
1747 WALK_SUBTREE (TYPE_MIN_VALUE (*tp));
1748 WALK_SUBTREE_TAIL (TYPE_MAX_VALUE (*tp));
1751 WALK_SUBTREE (TREE_TYPE (*tp));
1752 WALK_SUBTREE_TAIL (TYPE_OFFSET_BASETYPE (*tp));
1754 #ifdef INLINER_FOR_JAVA
1755 case EXIT_BLOCK_EXPR:
1756 WALK_SUBTREE_TAIL (TREE_OPERAND (*tp, 1));
1759 WALK_SUBTREE_TAIL (TREE_OPERAND (*tp, 0));
1760 #endif /* INLINER_FOR_JAVA */
1766 /* We didn't find what we were looking for. */
1770 #undef WALK_SUBTREE_TAIL
1773 /* Like walk_tree, but does not walk duplicate nodes more than
1777 walk_tree_without_duplicates (tp, func, data)
1785 htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
1786 result = walk_tree (tp, func, data, htab);
1791 /* Passed to walk_tree. Copies the node pointed to, if appropriate. */
1794 copy_tree_r (tp, walk_subtrees, data)
1797 void *data ATTRIBUTE_UNUSED;
1799 enum tree_code code = TREE_CODE (*tp);
1801 /* We make copies of most nodes. */
1802 if (IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (code))
1803 || TREE_CODE_CLASS (code) == 'r'
1804 || TREE_CODE_CLASS (code) == 'c'
1805 || TREE_CODE_CLASS (code) == 's'
1806 || code == TREE_LIST
1808 || (*lang_hooks.tree_inlining.tree_chain_matters_p) (*tp))
1810 /* Because the chain gets clobbered when we make a copy, we save it
1812 tree chain = TREE_CHAIN (*tp);
1814 /* Copy the node. */
1815 *tp = copy_node (*tp);
1817 /* Now, restore the chain, if appropriate. That will cause
1818 walk_tree to walk into the chain as well. */
1819 if (code == PARM_DECL || code == TREE_LIST
1820 #ifndef INLINER_FOR_JAVA
1821 || (*lang_hooks.tree_inlining.tree_chain_matters_p) (*tp)
1822 || statement_code_p (code))
1823 TREE_CHAIN (*tp) = chain;
1825 /* For now, we don't update BLOCKs when we make copies. So, we
1826 have to nullify all scope-statements. */
1827 if (TREE_CODE (*tp) == SCOPE_STMT)
1828 SCOPE_STMT_BLOCK (*tp) = NULL_TREE;
1829 #else /* INLINER_FOR_JAVA */
1830 || (*lang_hooks.tree_inlining.tree_chain_matters_p) (*tp))
1831 TREE_CHAIN (*tp) = chain;
1832 #endif /* INLINER_FOR_JAVA */
1834 else if (TREE_CODE_CLASS (code) == 't' && !variably_modified_type_p (*tp))
1835 /* Types only need to be copied if they are variably modified. */
1841 /* The SAVE_EXPR pointed to by TP is being copied. If ST contains
1842 information indicating to what new SAVE_EXPR this one should be
1843 mapped, use that one. Otherwise, create a new node and enter it in
1844 ST. FN is the function into which the copy will be placed. */
1847 remap_save_expr (tp, st_, fn, walk_subtrees)
1853 splay_tree st = (splay_tree) st_;
1856 /* See if we already encountered this SAVE_EXPR. */
1857 n = splay_tree_lookup (st, (splay_tree_key) *tp);
1859 /* If we didn't already remap this SAVE_EXPR, do so now. */
1862 tree t = copy_node (*tp);
1864 /* The SAVE_EXPR is now part of the function into which we
1865 are inlining this body. */
1866 SAVE_EXPR_CONTEXT (t) = fn;
1867 /* And we haven't evaluated it yet. */
1868 SAVE_EXPR_RTL (t) = NULL_RTX;
1869 /* Remember this SAVE_EXPR. */
1870 n = splay_tree_insert (st,
1871 (splay_tree_key) *tp,
1872 (splay_tree_value) t);
1873 /* Make sure we don't remap an already-remapped SAVE_EXPR. */
1874 splay_tree_insert (st, (splay_tree_key) t,
1875 (splay_tree_value) error_mark_node);
1878 /* We've already walked into this SAVE_EXPR, so we needn't do it
1882 /* Replace this SAVE_EXPR with the copy. */
1883 *tp = (tree) n->value;
1886 #ifdef INLINER_FOR_JAVA
1887 /* Add STMT to EXISTING if possible, otherwise create a new
1888 COMPOUND_EXPR and add STMT to it. */
1891 add_stmt_to_compound (existing, type, stmt)
1892 tree existing, type, stmt;
1897 return build (COMPOUND_EXPR, type, existing, stmt);
1902 #endif /* INLINER_FOR_JAVA */