Mercurial > hg > CbC > CbC_gcc
annotate gcc/cgraphbuild.c @ 66:b362627d71ba
bug-fix: modify tail-call-optimization enforcing rules. (calls.c.)
author | Ryoma SHINYA <shinya@firefly.cr.ie.u-ryukyu.ac.jp> |
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date | Tue, 14 Dec 2010 03:58:33 +0900 |
parents | 77e2b8dfacca |
children | b7f97abdc517 |
rev | line source |
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0 | 1 /* Callgraph construction. |
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2 Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 |
0 | 3 Free Software Foundation, Inc. |
4 Contributed by Jan Hubicka | |
5 | |
6 This file is part of GCC. | |
7 | |
8 GCC is free software; you can redistribute it and/or modify it under | |
9 the terms of the GNU General Public License as published by the Free | |
10 Software Foundation; either version 3, or (at your option) any later | |
11 version. | |
12 | |
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
16 for more details. | |
17 | |
18 You should have received a copy of the GNU General Public License | |
19 along with GCC; see the file COPYING3. If not see | |
20 <http://www.gnu.org/licenses/>. */ | |
21 | |
22 #include "config.h" | |
23 #include "system.h" | |
24 #include "coretypes.h" | |
25 #include "tm.h" | |
26 #include "tree.h" | |
27 #include "tree-flow.h" | |
28 #include "langhooks.h" | |
29 #include "pointer-set.h" | |
30 #include "cgraph.h" | |
31 #include "intl.h" | |
32 #include "gimple.h" | |
33 #include "tree-pass.h" | |
34 | |
35 /* Walk tree and record all calls and references to functions/variables. | |
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36 Called via walk_tree: TP is pointer to tree to be examined. |
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37 When DATA is non-null, record references to callgraph. |
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38 */ |
0 | 39 |
40 static tree | |
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41 record_reference (tree *tp, int *walk_subtrees, void *data) |
0 | 42 { |
43 tree t = *tp; | |
44 tree decl; | |
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45 bool do_callgraph = data != NULL; |
0 | 46 |
47 switch (TREE_CODE (t)) | |
48 { | |
49 case VAR_DECL: | |
50 if (TREE_STATIC (t) || DECL_EXTERNAL (t)) | |
51 { | |
52 varpool_mark_needed_node (varpool_node (t)); | |
53 if (lang_hooks.callgraph.analyze_expr) | |
54 return lang_hooks.callgraph.analyze_expr (tp, walk_subtrees); | |
55 } | |
56 break; | |
57 | |
58 case FDESC_EXPR: | |
59 case ADDR_EXPR: | |
60 /* Record dereferences to the functions. This makes the | |
61 functions reachable unconditionally. */ | |
62 decl = TREE_OPERAND (*tp, 0); | |
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63 if (TREE_CODE (decl) == FUNCTION_DECL && do_callgraph) |
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64 cgraph_mark_address_taken_node (cgraph_node (decl)); |
0 | 65 break; |
66 | |
67 default: | |
68 /* Save some cycles by not walking types and declaration as we | |
69 won't find anything useful there anyway. */ | |
70 if (IS_TYPE_OR_DECL_P (*tp)) | |
71 { | |
72 *walk_subtrees = 0; | |
73 break; | |
74 } | |
75 | |
76 if ((unsigned int) TREE_CODE (t) >= LAST_AND_UNUSED_TREE_CODE) | |
77 return lang_hooks.callgraph.analyze_expr (tp, walk_subtrees); | |
78 break; | |
79 } | |
80 | |
81 return NULL_TREE; | |
82 } | |
83 | |
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84 /* Reset inlining information of all incoming call edges of NODE. */ |
0 | 85 |
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86 void |
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87 reset_inline_failed (struct cgraph_node *node) |
0 | 88 { |
89 struct cgraph_edge *e; | |
90 | |
91 for (e = node->callers; e; e = e->next_caller) | |
92 { | |
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93 e->callee->global.inlined_to = NULL; |
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94 if (!node->analyzed) |
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95 e->inline_failed = CIF_BODY_NOT_AVAILABLE; |
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96 else if (node->local.redefined_extern_inline) |
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97 e->inline_failed = CIF_REDEFINED_EXTERN_INLINE; |
0 | 98 else if (!node->local.inlinable) |
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99 e->inline_failed = CIF_FUNCTION_NOT_INLINABLE; |
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100 else if (e->call_stmt_cannot_inline_p) |
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101 e->inline_failed = CIF_MISMATCHED_ARGUMENTS; |
0 | 102 else |
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103 e->inline_failed = CIF_FUNCTION_NOT_CONSIDERED; |
0 | 104 } |
105 } | |
106 | |
107 /* Computes the frequency of the call statement so that it can be stored in | |
108 cgraph_edge. BB is the basic block of the call statement. */ | |
109 int | |
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110 compute_call_stmt_bb_frequency (tree decl, basic_block bb) |
0 | 111 { |
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112 int entry_freq = ENTRY_BLOCK_PTR_FOR_FUNCTION |
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113 (DECL_STRUCT_FUNCTION (decl))->frequency; |
0 | 114 int freq = bb->frequency; |
115 | |
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116 if (profile_status_for_function (DECL_STRUCT_FUNCTION (decl)) == PROFILE_ABSENT) |
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117 return CGRAPH_FREQ_BASE; |
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118 |
0 | 119 if (!entry_freq) |
120 entry_freq = 1, freq++; | |
121 | |
122 freq = freq * CGRAPH_FREQ_BASE / entry_freq; | |
123 if (freq > CGRAPH_FREQ_MAX) | |
124 freq = CGRAPH_FREQ_MAX; | |
125 | |
126 return freq; | |
127 } | |
128 | |
129 /* Create cgraph edges for function calls. | |
130 Also look for functions and variables having addresses taken. */ | |
131 | |
132 static unsigned int | |
133 build_cgraph_edges (void) | |
134 { | |
135 basic_block bb; | |
136 struct cgraph_node *node = cgraph_node (current_function_decl); | |
137 struct pointer_set_t *visited_nodes = pointer_set_create (); | |
138 gimple_stmt_iterator gsi; | |
139 tree step; | |
140 | |
141 /* Create the callgraph edges and record the nodes referenced by the function. | |
142 body. */ | |
143 FOR_EACH_BB (bb) | |
144 for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi)) | |
145 { | |
146 gimple stmt = gsi_stmt (gsi); | |
147 tree decl; | |
148 | |
149 if (is_gimple_call (stmt) && (decl = gimple_call_fndecl (stmt))) | |
150 { | |
151 size_t i; | |
152 size_t n = gimple_call_num_args (stmt); | |
153 cgraph_create_edge (node, cgraph_node (decl), stmt, | |
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154 bb->count, compute_call_stmt_bb_frequency (current_function_decl, bb), |
0 | 155 bb->loop_depth); |
156 for (i = 0; i < n; i++) | |
157 walk_tree (gimple_call_arg_ptr (stmt, i), record_reference, | |
158 node, visited_nodes); | |
159 if (gimple_call_lhs (stmt)) | |
160 walk_tree (gimple_call_lhs_ptr (stmt), record_reference, node, | |
161 visited_nodes); | |
162 } | |
163 else | |
164 { | |
165 struct walk_stmt_info wi; | |
166 memset (&wi, 0, sizeof (wi)); | |
167 wi.info = node; | |
168 wi.pset = visited_nodes; | |
169 walk_gimple_op (stmt, record_reference, &wi); | |
170 if (gimple_code (stmt) == GIMPLE_OMP_PARALLEL | |
171 && gimple_omp_parallel_child_fn (stmt)) | |
172 { | |
173 tree fn = gimple_omp_parallel_child_fn (stmt); | |
174 cgraph_mark_needed_node (cgraph_node (fn)); | |
175 } | |
176 if (gimple_code (stmt) == GIMPLE_OMP_TASK) | |
177 { | |
178 tree fn = gimple_omp_task_child_fn (stmt); | |
179 if (fn) | |
180 cgraph_mark_needed_node (cgraph_node (fn)); | |
181 fn = gimple_omp_task_copy_fn (stmt); | |
182 if (fn) | |
183 cgraph_mark_needed_node (cgraph_node (fn)); | |
184 } | |
185 } | |
186 } | |
187 | |
188 /* Look for initializers of constant variables and private statics. */ | |
189 for (step = cfun->local_decls; | |
190 step; | |
191 step = TREE_CHAIN (step)) | |
192 { | |
193 tree decl = TREE_VALUE (step); | |
194 if (TREE_CODE (decl) == VAR_DECL | |
195 && (TREE_STATIC (decl) && !DECL_EXTERNAL (decl))) | |
196 varpool_finalize_decl (decl); | |
197 else if (TREE_CODE (decl) == VAR_DECL && DECL_INITIAL (decl)) | |
198 walk_tree (&DECL_INITIAL (decl), record_reference, node, visited_nodes); | |
199 } | |
200 | |
201 pointer_set_destroy (visited_nodes); | |
202 return 0; | |
203 } | |
204 | |
205 struct gimple_opt_pass pass_build_cgraph_edges = | |
206 { | |
207 { | |
208 GIMPLE_PASS, | |
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209 "*build_cgraph_edges", /* name */ |
0 | 210 NULL, /* gate */ |
211 build_cgraph_edges, /* execute */ | |
212 NULL, /* sub */ | |
213 NULL, /* next */ | |
214 0, /* static_pass_number */ | |
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215 TV_NONE, /* tv_id */ |
0 | 216 PROP_cfg, /* properties_required */ |
217 0, /* properties_provided */ | |
218 0, /* properties_destroyed */ | |
219 0, /* todo_flags_start */ | |
220 0 /* todo_flags_finish */ | |
221 } | |
222 }; | |
223 | |
224 /* Record references to functions and other variables present in the | |
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225 initial value of DECL, a variable. |
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226 When ONLY_VARS is true, we mark needed only variables, not functions. */ |
0 | 227 |
228 void | |
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229 record_references_in_initializer (tree decl, bool only_vars) |
0 | 230 { |
231 struct pointer_set_t *visited_nodes = pointer_set_create (); | |
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232 walk_tree (&DECL_INITIAL (decl), record_reference, |
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233 only_vars ? NULL : decl, visited_nodes); |
0 | 234 pointer_set_destroy (visited_nodes); |
235 } | |
236 | |
237 /* Rebuild cgraph edges for current function node. This needs to be run after | |
238 passes that don't update the cgraph. */ | |
239 | |
240 unsigned int | |
241 rebuild_cgraph_edges (void) | |
242 { | |
243 basic_block bb; | |
244 struct cgraph_node *node = cgraph_node (current_function_decl); | |
245 gimple_stmt_iterator gsi; | |
246 | |
247 cgraph_node_remove_callees (node); | |
248 | |
249 node->count = ENTRY_BLOCK_PTR->count; | |
250 | |
251 FOR_EACH_BB (bb) | |
252 for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi)) | |
253 { | |
254 gimple stmt = gsi_stmt (gsi); | |
255 tree decl; | |
256 | |
257 if (is_gimple_call (stmt) && (decl = gimple_call_fndecl (stmt))) | |
258 cgraph_create_edge (node, cgraph_node (decl), stmt, | |
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259 bb->count, |
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260 compute_call_stmt_bb_frequency |
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261 (current_function_decl, bb), |
0 | 262 bb->loop_depth); |
263 | |
264 } | |
265 gcc_assert (!node->global.inlined_to); | |
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266 |
0 | 267 return 0; |
268 } | |
269 | |
270 struct gimple_opt_pass pass_rebuild_cgraph_edges = | |
271 { | |
272 { | |
273 GIMPLE_PASS, | |
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274 "*rebuild_cgraph_edges", /* name */ |
0 | 275 NULL, /* gate */ |
276 rebuild_cgraph_edges, /* execute */ | |
277 NULL, /* sub */ | |
278 NULL, /* next */ | |
279 0, /* static_pass_number */ | |
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280 TV_NONE, /* tv_id */ |
0 | 281 PROP_cfg, /* properties_required */ |
282 0, /* properties_provided */ | |
283 0, /* properties_destroyed */ | |
284 0, /* todo_flags_start */ | |
285 0, /* todo_flags_finish */ | |
286 } | |
287 }; | |
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288 |
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289 |
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290 static unsigned int |
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291 remove_cgraph_callee_edges (void) |
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292 { |
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293 cgraph_node_remove_callees (cgraph_node (current_function_decl)); |
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294 return 0; |
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295 } |
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296 |
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297 struct gimple_opt_pass pass_remove_cgraph_callee_edges = |
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298 { |
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299 { |
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300 GIMPLE_PASS, |
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301 "*remove_cgraph_callee_edges", /* name */ |
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302 NULL, /* gate */ |
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303 remove_cgraph_callee_edges, /* execute */ |
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304 NULL, /* sub */ |
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305 NULL, /* next */ |
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306 0, /* static_pass_number */ |
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307 TV_NONE, /* tv_id */ |
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308 0, /* properties_required */ |
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309 0, /* properties_provided */ |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
310 0, /* properties_destroyed */ |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
311 0, /* todo_flags_start */ |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
312 0, /* todo_flags_finish */ |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
313 } |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
314 }; |