1 /* Perform optimizations on tree structure.
2 Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
3 Written by Mark Michell (mark@codesourcery.com).
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it
8 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, but
13 WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 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 the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
24 #include "coretypes.h"
29 #include "insn-config.h"
31 #include "integrate.h"
37 #include "tree-inline.h"
41 static tree calls_setjmp_r (tree *, int *, void *);
42 static void update_cloned_parm (tree, tree);
43 static void dump_function (enum tree_dump_index, tree);
45 /* Optimize the body of FN. */
48 optimize_function (tree fn)
50 dump_function (TDI_original, fn);
53 /* We do not inline thunks, as (a) the backend tries to optimize
54 the call to the thunkee, (b) tree based inlining breaks that
55 optimization, (c) virtual functions are rarely inlineable,
56 and (d) TARGET_ASM_OUTPUT_MI_THUNK is there to DTRT anyway. */
57 && !DECL_THUNK_P (fn))
59 optimize_inline_calls (fn);
61 dump_function (TDI_inlined, fn);
64 dump_function (TDI_optimized, fn);
67 /* Called from calls_setjmp_p via walk_tree. */
70 calls_setjmp_r (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
71 void *data ATTRIBUTE_UNUSED)
73 /* We're only interested in FUNCTION_DECLS. */
74 if (TREE_CODE (*tp) != FUNCTION_DECL)
77 return setjmp_call_p (*tp) ? *tp : NULL_TREE;
80 /* Returns nonzero if FN calls `setjmp' or some other function that
81 can return more than once. This function is conservative; it may
82 occasionally return a nonzero value even when FN does not actually
86 calls_setjmp_p (tree fn)
88 return walk_tree_without_duplicates (&DECL_SAVED_TREE (fn),
93 /* CLONED_PARM is a copy of CLONE, generated for a cloned constructor
94 or destructor. Update it to ensure that the source-position for
95 the cloned parameter matches that for the original, and that the
96 debugging generation code will be able to find the original PARM. */
99 update_cloned_parm (tree parm, tree cloned_parm)
101 DECL_ABSTRACT_ORIGIN (cloned_parm) = parm;
103 /* We may have taken its address. */
104 TREE_ADDRESSABLE (cloned_parm) = TREE_ADDRESSABLE (parm);
106 /* The definition might have different constness. */
107 TREE_READONLY (cloned_parm) = TREE_READONLY (parm);
109 TREE_USED (cloned_parm) = TREE_USED (parm);
111 /* The name may have changed from the declaration. */
112 DECL_NAME (cloned_parm) = DECL_NAME (parm);
113 DECL_SOURCE_LOCATION (cloned_parm) = DECL_SOURCE_LOCATION (parm);
116 /* FN is a function that has a complete body. Clone the body as
117 necessary. Returns nonzero if there's no longer any need to
118 process the main body. */
121 maybe_clone_body (tree fn)
126 /* We only clone constructors and destructors. */
127 if (!DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (fn)
128 && !DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (fn))
131 /* Emit the DWARF1 abstract instance. */
132 (*debug_hooks->deferred_inline_function) (fn);
134 /* We know that any clones immediately follow FN in the TYPE_METHODS
136 for (clone = TREE_CHAIN (fn);
137 clone && DECL_CLONED_FUNCTION_P (clone);
138 clone = TREE_CHAIN (clone), first = false)
145 /* Update CLONE's source position information to match FN's. */
146 DECL_SOURCE_LOCATION (clone) = DECL_SOURCE_LOCATION (fn);
147 DECL_INLINE (clone) = DECL_INLINE (fn);
148 DECL_DECLARED_INLINE_P (clone) = DECL_DECLARED_INLINE_P (fn);
149 DECL_COMDAT (clone) = DECL_COMDAT (fn);
150 DECL_WEAK (clone) = DECL_WEAK (fn);
151 DECL_ONE_ONLY (clone) = DECL_ONE_ONLY (fn);
152 DECL_SECTION_NAME (clone) = DECL_SECTION_NAME (fn);
153 DECL_USE_TEMPLATE (clone) = DECL_USE_TEMPLATE (fn);
154 DECL_EXTERNAL (clone) = DECL_EXTERNAL (fn);
155 DECL_INTERFACE_KNOWN (clone) = DECL_INTERFACE_KNOWN (fn);
156 DECL_NOT_REALLY_EXTERN (clone) = DECL_NOT_REALLY_EXTERN (fn);
157 TREE_PUBLIC (clone) = TREE_PUBLIC (fn);
159 /* Adjust the parameter names and locations. */
160 parm = DECL_ARGUMENTS (fn);
161 clone_parm = DECL_ARGUMENTS (clone);
162 /* Update the `this' parameter, which is always first. */
163 update_cloned_parm (parm, clone_parm);
164 parm = TREE_CHAIN (parm);
165 clone_parm = TREE_CHAIN (clone_parm);
166 if (DECL_HAS_IN_CHARGE_PARM_P (fn))
167 parm = TREE_CHAIN (parm);
168 if (DECL_HAS_VTT_PARM_P (fn))
169 parm = TREE_CHAIN (parm);
170 if (DECL_HAS_VTT_PARM_P (clone))
171 clone_parm = TREE_CHAIN (clone_parm);
173 parm = TREE_CHAIN (parm), clone_parm = TREE_CHAIN (clone_parm))
175 /* Update this parameter. */
176 update_cloned_parm (parm, clone_parm);
177 /* We should only give unused information for one clone. */
179 TREE_USED (clone_parm) = 1;
182 /* Start processing the function. */
183 push_to_top_level ();
184 start_function (NULL_TREE, clone, NULL_TREE, SF_PRE_PARSED);
186 /* Remap the parameters. */
187 decl_map = splay_tree_new (splay_tree_compare_pointers, NULL, NULL);
189 parm = DECL_ARGUMENTS (fn),
190 clone_parm = DECL_ARGUMENTS (clone);
193 parm = TREE_CHAIN (parm))
195 /* Map the in-charge parameter to an appropriate constant. */
196 if (DECL_HAS_IN_CHARGE_PARM_P (fn) && parmno == 1)
199 in_charge = in_charge_arg_for_name (DECL_NAME (clone));
200 splay_tree_insert (decl_map,
201 (splay_tree_key) parm,
202 (splay_tree_value) in_charge);
204 else if (DECL_ARTIFICIAL (parm)
205 && DECL_NAME (parm) == vtt_parm_identifier)
207 /* For a subobject constructor or destructor, the next
208 argument is the VTT parameter. Remap the VTT_PARM
209 from the CLONE to this parameter. */
210 if (DECL_HAS_VTT_PARM_P (clone))
212 DECL_ABSTRACT_ORIGIN (clone_parm) = parm;
213 splay_tree_insert (decl_map,
214 (splay_tree_key) parm,
215 (splay_tree_value) clone_parm);
216 clone_parm = TREE_CHAIN (clone_parm);
218 /* Otherwise, map the VTT parameter to `NULL'. */
221 splay_tree_insert (decl_map,
222 (splay_tree_key) parm,
223 (splay_tree_value) null_pointer_node);
226 /* Map other parameters to their equivalents in the cloned
230 splay_tree_insert (decl_map,
231 (splay_tree_key) parm,
232 (splay_tree_value) clone_parm);
233 clone_parm = TREE_CHAIN (clone_parm);
237 /* Clone the body. */
238 clone_body (clone, fn, decl_map);
240 /* There are as many statements in the clone as in the
242 DECL_ESTIMATED_INSNS (clone) = DECL_ESTIMATED_INSNS (fn);
245 splay_tree_delete (decl_map);
247 /* The clone can throw iff the original function can throw. */
248 cp_function_chain->can_throw = !TREE_NOTHROW (fn);
250 /* Now, expand this function into RTL, if appropriate. */
252 BLOCK_ABSTRACT_ORIGIN (DECL_INITIAL (clone)) = DECL_INITIAL (fn);
253 expand_or_defer_fn (clone);
254 pop_from_top_level ();
257 /* We don't need to process the original function any further. */
261 /* Dump FUNCTION_DECL FN as tree dump PHASE. */
264 dump_function (enum tree_dump_index phase, tree fn)
269 stream = dump_begin (phase, &flags);
272 fprintf (stream, "\n;; Function %s",
273 decl_as_string (fn, TFF_DECL_SPECIFIERS));
274 fprintf (stream, " (%s)\n",
275 decl_as_string (DECL_ASSEMBLER_NAME (fn), 0));
276 fprintf (stream, ";; enabled by -fdump-%s\n", dump_flag_name (phase));
277 fprintf (stream, "\n");
279 dump_node (fn, TDF_SLIM | flags, stream);
280 dump_end (phase, stream);