Mercurial > hg > CbC > CbC_gcc
annotate gcc/tree-ssa-operands.c @ 63:b7f97abdc517 gcc-4.6-20100522
update gcc from gcc-4.5.0 to gcc-4.6
author | ryoma <e075725@ie.u-ryukyu.ac.jp> |
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date | Mon, 24 May 2010 12:47:05 +0900 |
parents | 77e2b8dfacca |
children | f6334be47118 |
rev | line source |
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0 | 1 /* SSA operands management for trees. |
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2 Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 |
0 | 3 Free Software Foundation, Inc. |
4 | |
5 This file is part of GCC. | |
6 | |
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 3, or (at your option) | |
10 any later version. | |
11 | |
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. | |
16 | |
17 You should have received a copy of the GNU General Public License | |
18 along with GCC; see the file COPYING3. If not see | |
19 <http://www.gnu.org/licenses/>. */ | |
20 | |
21 #include "config.h" | |
22 #include "system.h" | |
23 #include "coretypes.h" | |
24 #include "tm.h" | |
25 #include "tree.h" | |
26 #include "flags.h" | |
27 #include "function.h" | |
28 #include "diagnostic.h" | |
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29 #include "tree-pretty-print.h" |
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30 #include "gimple-pretty-print.h" |
0 | 31 #include "tree-flow.h" |
32 #include "tree-inline.h" | |
33 #include "tree-pass.h" | |
34 #include "ggc.h" | |
35 #include "timevar.h" | |
36 #include "toplev.h" | |
37 #include "langhooks.h" | |
38 #include "ipa-reference.h" | |
39 | |
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40 /* This file contains the code required to manage the operands cache of the |
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41 SSA optimizer. For every stmt, we maintain an operand cache in the stmt |
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42 annotation. This cache contains operands that will be of interest to |
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43 optimizers and other passes wishing to manipulate the IL. |
0 | 44 |
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45 The operand type are broken up into REAL and VIRTUAL operands. The real |
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46 operands are represented as pointers into the stmt's operand tree. Thus |
0 | 47 any manipulation of the real operands will be reflected in the actual tree. |
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48 Virtual operands are represented solely in the cache, although the base |
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49 variable for the SSA_NAME may, or may not occur in the stmt's tree. |
0 | 50 Manipulation of the virtual operands will not be reflected in the stmt tree. |
51 | |
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52 The routines in this file are concerned with creating this operand cache |
0 | 53 from a stmt tree. |
54 | |
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55 The operand tree is the parsed by the various get_* routines which look |
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56 through the stmt tree for the occurrence of operands which may be of |
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57 interest, and calls are made to the append_* routines whenever one is |
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58 found. There are 4 of these routines, each representing one of the |
0 | 59 4 types of operands. Defs, Uses, Virtual Uses, and Virtual May Defs. |
60 | |
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61 The append_* routines check for duplication, and simply keep a list of |
0 | 62 unique objects for each operand type in the build_* extendable vectors. |
63 | |
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64 Once the stmt tree is completely parsed, the finalize_ssa_operands() |
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65 routine is called, which proceeds to perform the finalization routine |
0 | 66 on each of the 4 operand vectors which have been built up. |
67 | |
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68 If the stmt had a previous operand cache, the finalization routines |
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69 attempt to match up the new operands with the old ones. If it's a perfect |
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70 match, the old vector is simply reused. If it isn't a perfect match, then |
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71 a new vector is created and the new operands are placed there. For |
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72 virtual operands, if the previous cache had SSA_NAME version of a |
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73 variable, and that same variable occurs in the same operands cache, then |
0 | 74 the new cache vector will also get the same SSA_NAME. |
75 | |
76 i.e., if a stmt had a VUSE of 'a_5', and 'a' occurs in the new | |
77 operand vector for VUSE, then the new vector will also be modified | |
78 such that it contains 'a_5' rather than 'a'. */ | |
79 | |
80 /* Structure storing statistics on how many call clobbers we have, and | |
81 how many where avoided. */ | |
82 | |
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83 static struct |
0 | 84 { |
85 /* Number of call-clobbered ops we attempt to add to calls in | |
86 add_call_clobbered_mem_symbols. */ | |
87 unsigned int clobbered_vars; | |
88 | |
89 /* Number of write-clobbers (VDEFs) avoided by using | |
90 not_written information. */ | |
91 unsigned int static_write_clobbers_avoided; | |
92 | |
93 /* Number of reads (VUSEs) avoided by using not_read information. */ | |
94 unsigned int static_read_clobbers_avoided; | |
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95 |
0 | 96 /* Number of write-clobbers avoided because the variable can't escape to |
97 this call. */ | |
98 unsigned int unescapable_clobbers_avoided; | |
99 | |
100 /* Number of read-only uses we attempt to add to calls in | |
101 add_call_read_mem_symbols. */ | |
102 unsigned int readonly_clobbers; | |
103 | |
104 /* Number of read-only uses we avoid using not_read information. */ | |
105 unsigned int static_readonly_clobbers_avoided; | |
106 } clobber_stats; | |
107 | |
108 | |
109 /* Flags to describe operand properties in helpers. */ | |
110 | |
111 /* By default, operands are loaded. */ | |
112 #define opf_use 0 | |
113 | |
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114 /* Operand is the target of an assignment expression or a |
0 | 115 call-clobbered variable. */ |
116 #define opf_def (1 << 0) | |
117 | |
118 /* No virtual operands should be created in the expression. This is used | |
119 when traversing ADDR_EXPR nodes which have different semantics than | |
120 other expressions. Inside an ADDR_EXPR node, the only operands that we | |
121 need to consider are indices into arrays. For instance, &a.b[i] should | |
122 generate a USE of 'i' but it should not generate a VUSE for 'a' nor a | |
123 VUSE for 'b'. */ | |
124 #define opf_no_vops (1 << 1) | |
125 | |
126 /* Operand is an implicit reference. This is used to distinguish | |
127 explicit assignments in the form of MODIFY_EXPR from | |
128 clobbering sites like function calls or ASM_EXPRs. */ | |
129 #define opf_implicit (1 << 2) | |
130 | |
131 /* Array for building all the def operands. */ | |
132 static VEC(tree,heap) *build_defs; | |
133 | |
134 /* Array for building all the use operands. */ | |
135 static VEC(tree,heap) *build_uses; | |
136 | |
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137 /* The built VDEF operand. */ |
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138 static tree build_vdef; |
0 | 139 |
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140 /* The built VUSE operand. */ |
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141 static tree build_vuse; |
0 | 142 |
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143 /* Bitmap obstack for our datastructures that needs to survive across |
0 | 144 compilations of multiple functions. */ |
145 static bitmap_obstack operands_bitmap_obstack; | |
146 | |
147 static void get_expr_operands (gimple, tree *, int); | |
148 | |
149 /* Number of functions with initialized ssa_operands. */ | |
150 static int n_initialized = 0; | |
151 | |
152 /* Return the DECL_UID of the base variable of T. */ | |
153 | |
154 static inline unsigned | |
155 get_name_decl (const_tree t) | |
156 { | |
157 if (TREE_CODE (t) != SSA_NAME) | |
158 return DECL_UID (t); | |
159 else | |
160 return DECL_UID (SSA_NAME_VAR (t)); | |
161 } | |
162 | |
163 | |
164 /* Return true if the SSA operands cache is active. */ | |
165 | |
166 bool | |
167 ssa_operands_active (void) | |
168 { | |
169 /* This function may be invoked from contexts where CFUN is NULL | |
170 (IPA passes), return false for now. FIXME: operands may be | |
171 active in each individual function, maybe this function should | |
172 take CFUN as a parameter. */ | |
173 if (cfun == NULL) | |
174 return false; | |
175 | |
176 return cfun->gimple_df && gimple_ssa_operands (cfun)->ops_active; | |
177 } | |
178 | |
179 | |
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180 /* Create the VOP variable, an artificial global variable to act as a |
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181 representative of all of the virtual operands FUD chain. */ |
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182 |
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183 static void |
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184 create_vop_var (void) |
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185 { |
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186 tree global_var; |
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187 |
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188 gcc_assert (cfun->gimple_df->vop == NULL_TREE); |
0 | 189 |
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190 global_var = build_decl (BUILTINS_LOCATION, VAR_DECL, |
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191 get_identifier (".MEM"), |
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192 void_type_node); |
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193 DECL_ARTIFICIAL (global_var) = 1; |
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194 TREE_READONLY (global_var) = 0; |
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195 DECL_EXTERNAL (global_var) = 1; |
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196 TREE_STATIC (global_var) = 1; |
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197 TREE_USED (global_var) = 1; |
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198 DECL_CONTEXT (global_var) = NULL_TREE; |
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199 TREE_THIS_VOLATILE (global_var) = 0; |
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200 TREE_ADDRESSABLE (global_var) = 0; |
0 | 201 |
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202 create_var_ann (global_var); |
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203 add_referenced_var (global_var); |
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204 cfun->gimple_df->vop = global_var; |
0 | 205 } |
206 | |
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207 /* These are the sizes of the operand memory buffer in bytes which gets |
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208 allocated each time more operands space is required. The final value is |
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209 the amount that is allocated every time after that. |
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210 In 1k we can fit 25 use operands (or 63 def operands) on a host with |
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211 8 byte pointers, that would be 10 statements each with 1 def and 2 |
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212 uses. */ |
0 | 213 |
214 #define OP_SIZE_INIT 0 | |
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215 #define OP_SIZE_1 (1024 - sizeof (void *)) |
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216 #define OP_SIZE_2 (1024 * 4 - sizeof (void *)) |
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217 #define OP_SIZE_3 (1024 * 16 - sizeof (void *)) |
0 | 218 |
219 /* Initialize the operand cache routines. */ | |
220 | |
221 void | |
222 init_ssa_operands (void) | |
223 { | |
224 if (!n_initialized++) | |
225 { | |
226 build_defs = VEC_alloc (tree, heap, 5); | |
227 build_uses = VEC_alloc (tree, heap, 10); | |
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228 build_vuse = NULL_TREE; |
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229 build_vdef = NULL_TREE; |
0 | 230 bitmap_obstack_initialize (&operands_bitmap_obstack); |
231 } | |
232 | |
233 gcc_assert (gimple_ssa_operands (cfun)->operand_memory == NULL); | |
234 gimple_ssa_operands (cfun)->operand_memory_index | |
235 = gimple_ssa_operands (cfun)->ssa_operand_mem_size; | |
236 gimple_ssa_operands (cfun)->ops_active = true; | |
237 memset (&clobber_stats, 0, sizeof (clobber_stats)); | |
238 gimple_ssa_operands (cfun)->ssa_operand_mem_size = OP_SIZE_INIT; | |
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239 create_vop_var (); |
0 | 240 } |
241 | |
242 | |
243 /* Dispose of anything required by the operand routines. */ | |
244 | |
245 void | |
246 fini_ssa_operands (void) | |
247 { | |
248 struct ssa_operand_memory_d *ptr; | |
249 | |
250 if (!--n_initialized) | |
251 { | |
252 VEC_free (tree, heap, build_defs); | |
253 VEC_free (tree, heap, build_uses); | |
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254 build_vdef = NULL_TREE; |
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255 build_vuse = NULL_TREE; |
0 | 256 } |
257 | |
258 gimple_ssa_operands (cfun)->free_defs = NULL; | |
259 gimple_ssa_operands (cfun)->free_uses = NULL; | |
260 | |
261 while ((ptr = gimple_ssa_operands (cfun)->operand_memory) != NULL) | |
262 { | |
263 gimple_ssa_operands (cfun)->operand_memory | |
264 = gimple_ssa_operands (cfun)->operand_memory->next; | |
265 ggc_free (ptr); | |
266 } | |
267 | |
268 gimple_ssa_operands (cfun)->ops_active = false; | |
269 | |
270 if (!n_initialized) | |
271 bitmap_obstack_release (&operands_bitmap_obstack); | |
272 | |
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273 cfun->gimple_df->vop = NULL_TREE; |
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274 |
0 | 275 if (dump_file && (dump_flags & TDF_STATS)) |
276 { | |
277 fprintf (dump_file, "Original clobbered vars: %d\n", | |
278 clobber_stats.clobbered_vars); | |
279 fprintf (dump_file, "Static write clobbers avoided: %d\n", | |
280 clobber_stats.static_write_clobbers_avoided); | |
281 fprintf (dump_file, "Static read clobbers avoided: %d\n", | |
282 clobber_stats.static_read_clobbers_avoided); | |
283 fprintf (dump_file, "Unescapable clobbers avoided: %d\n", | |
284 clobber_stats.unescapable_clobbers_avoided); | |
285 fprintf (dump_file, "Original read-only clobbers: %d\n", | |
286 clobber_stats.readonly_clobbers); | |
287 fprintf (dump_file, "Static read-only clobbers avoided: %d\n", | |
288 clobber_stats.static_readonly_clobbers_avoided); | |
289 } | |
290 } | |
291 | |
292 | |
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293 /* Return memory for an operand of size SIZE. */ |
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294 |
0 | 295 static inline void * |
296 ssa_operand_alloc (unsigned size) | |
297 { | |
298 char *ptr; | |
299 | |
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300 gcc_assert (size == sizeof (struct use_optype_d) |
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301 || size == sizeof (struct def_optype_d)); |
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302 |
0 | 303 if (gimple_ssa_operands (cfun)->operand_memory_index + size |
304 >= gimple_ssa_operands (cfun)->ssa_operand_mem_size) | |
305 { | |
306 struct ssa_operand_memory_d *ptr; | |
307 | |
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308 switch (gimple_ssa_operands (cfun)->ssa_operand_mem_size) |
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309 { |
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310 case OP_SIZE_INIT: |
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311 gimple_ssa_operands (cfun)->ssa_operand_mem_size = OP_SIZE_1; |
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312 break; |
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313 case OP_SIZE_1: |
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314 gimple_ssa_operands (cfun)->ssa_operand_mem_size = OP_SIZE_2; |
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315 break; |
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316 case OP_SIZE_2: |
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317 case OP_SIZE_3: |
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318 gimple_ssa_operands (cfun)->ssa_operand_mem_size = OP_SIZE_3; |
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319 break; |
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320 default: |
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321 gcc_unreachable (); |
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322 } |
0 | 323 |
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324 ptr = (struct ssa_operand_memory_d *) |
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325 ggc_alloc (sizeof (void *) |
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326 + gimple_ssa_operands (cfun)->ssa_operand_mem_size); |
0 | 327 ptr->next = gimple_ssa_operands (cfun)->operand_memory; |
328 gimple_ssa_operands (cfun)->operand_memory = ptr; | |
329 gimple_ssa_operands (cfun)->operand_memory_index = 0; | |
330 } | |
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331 |
0 | 332 ptr = &(gimple_ssa_operands (cfun)->operand_memory |
333 ->mem[gimple_ssa_operands (cfun)->operand_memory_index]); | |
334 gimple_ssa_operands (cfun)->operand_memory_index += size; | |
335 return ptr; | |
336 } | |
337 | |
338 | |
339 /* Allocate a DEF operand. */ | |
340 | |
341 static inline struct def_optype_d * | |
342 alloc_def (void) | |
343 { | |
344 struct def_optype_d *ret; | |
345 if (gimple_ssa_operands (cfun)->free_defs) | |
346 { | |
347 ret = gimple_ssa_operands (cfun)->free_defs; | |
348 gimple_ssa_operands (cfun)->free_defs | |
349 = gimple_ssa_operands (cfun)->free_defs->next; | |
350 } | |
351 else | |
352 ret = (struct def_optype_d *) | |
353 ssa_operand_alloc (sizeof (struct def_optype_d)); | |
354 return ret; | |
355 } | |
356 | |
357 | |
358 /* Allocate a USE operand. */ | |
359 | |
360 static inline struct use_optype_d * | |
361 alloc_use (void) | |
362 { | |
363 struct use_optype_d *ret; | |
364 if (gimple_ssa_operands (cfun)->free_uses) | |
365 { | |
366 ret = gimple_ssa_operands (cfun)->free_uses; | |
367 gimple_ssa_operands (cfun)->free_uses | |
368 = gimple_ssa_operands (cfun)->free_uses->next; | |
369 } | |
370 else | |
371 ret = (struct use_optype_d *) | |
372 ssa_operand_alloc (sizeof (struct use_optype_d)); | |
373 return ret; | |
374 } | |
375 | |
376 | |
377 /* Adds OP to the list of defs after LAST. */ | |
378 | |
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379 static inline def_optype_p |
0 | 380 add_def_op (tree *op, def_optype_p last) |
381 { | |
382 def_optype_p new_def; | |
383 | |
384 new_def = alloc_def (); | |
385 DEF_OP_PTR (new_def) = op; | |
386 last->next = new_def; | |
387 new_def->next = NULL; | |
388 return new_def; | |
389 } | |
390 | |
391 | |
392 /* Adds OP to the list of uses of statement STMT after LAST. */ | |
393 | |
394 static inline use_optype_p | |
395 add_use_op (gimple stmt, tree *op, use_optype_p last) | |
396 { | |
397 use_optype_p new_use; | |
398 | |
399 new_use = alloc_use (); | |
400 USE_OP_PTR (new_use)->use = op; | |
401 link_imm_use_stmt (USE_OP_PTR (new_use), *op, stmt); | |
402 last->next = new_use; | |
403 new_use->next = NULL; | |
404 return new_use; | |
405 } | |
406 | |
407 | |
408 | |
409 /* Takes elements from build_defs and turns them into def operands of STMT. | |
410 TODO -- Make build_defs VEC of tree *. */ | |
411 | |
412 static inline void | |
413 finalize_ssa_defs (gimple stmt) | |
414 { | |
415 unsigned new_i; | |
416 struct def_optype_d new_list; | |
417 def_optype_p old_ops, last; | |
418 unsigned int num = VEC_length (tree, build_defs); | |
419 | |
420 /* There should only be a single real definition per assignment. */ | |
421 gcc_assert ((stmt && gimple_code (stmt) != GIMPLE_ASSIGN) || num <= 1); | |
422 | |
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423 /* Pre-pend the vdef we may have built. */ |
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424 if (build_vdef != NULL_TREE) |
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425 { |
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426 tree oldvdef = gimple_vdef (stmt); |
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427 if (oldvdef |
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428 && TREE_CODE (oldvdef) == SSA_NAME) |
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429 oldvdef = SSA_NAME_VAR (oldvdef); |
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430 if (oldvdef != build_vdef) |
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431 gimple_set_vdef (stmt, build_vdef); |
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432 VEC_safe_insert (tree, heap, build_defs, 0, (tree)gimple_vdef_ptr (stmt)); |
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433 ++num; |
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434 } |
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435 |
0 | 436 new_list.next = NULL; |
437 last = &new_list; | |
438 | |
439 old_ops = gimple_def_ops (stmt); | |
440 | |
441 new_i = 0; | |
442 | |
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443 /* Clear and unlink a no longer necessary VDEF. */ |
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444 if (build_vdef == NULL_TREE |
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445 && gimple_vdef (stmt) != NULL_TREE) |
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446 { |
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447 if (TREE_CODE (gimple_vdef (stmt)) == SSA_NAME) |
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448 { |
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449 unlink_stmt_vdef (stmt); |
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450 release_ssa_name (gimple_vdef (stmt)); |
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451 } |
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452 gimple_set_vdef (stmt, NULL_TREE); |
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453 } |
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454 |
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455 /* If we have a non-SSA_NAME VDEF, mark it for renaming. */ |
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456 if (gimple_vdef (stmt) |
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457 && TREE_CODE (gimple_vdef (stmt)) != SSA_NAME) |
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458 mark_sym_for_renaming (gimple_vdef (stmt)); |
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459 |
0 | 460 /* Check for the common case of 1 def that hasn't changed. */ |
461 if (old_ops && old_ops->next == NULL && num == 1 | |
462 && (tree *) VEC_index (tree, build_defs, 0) == DEF_OP_PTR (old_ops)) | |
463 return; | |
464 | |
465 /* If there is anything in the old list, free it. */ | |
466 if (old_ops) | |
467 { | |
468 old_ops->next = gimple_ssa_operands (cfun)->free_defs; | |
469 gimple_ssa_operands (cfun)->free_defs = old_ops; | |
470 } | |
471 | |
472 /* If there is anything remaining in the build_defs list, simply emit it. */ | |
473 for ( ; new_i < num; new_i++) | |
474 last = add_def_op ((tree *) VEC_index (tree, build_defs, new_i), last); | |
475 | |
476 /* Now set the stmt's operands. */ | |
477 gimple_set_def_ops (stmt, new_list.next); | |
478 } | |
479 | |
480 | |
481 /* Takes elements from build_uses and turns them into use operands of STMT. | |
482 TODO -- Make build_uses VEC of tree *. */ | |
483 | |
484 static inline void | |
485 finalize_ssa_uses (gimple stmt) | |
486 { | |
487 unsigned new_i; | |
488 struct use_optype_d new_list; | |
489 use_optype_p old_ops, ptr, last; | |
490 | |
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491 /* Pre-pend the VUSE we may have built. */ |
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492 if (build_vuse != NULL_TREE) |
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493 { |
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494 tree oldvuse = gimple_vuse (stmt); |
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495 if (oldvuse |
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496 && TREE_CODE (oldvuse) == SSA_NAME) |
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497 oldvuse = SSA_NAME_VAR (oldvuse); |
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498 if (oldvuse != (build_vuse != NULL_TREE |
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499 ? build_vuse : build_vdef)) |
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500 gimple_set_vuse (stmt, NULL_TREE); |
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501 VEC_safe_insert (tree, heap, build_uses, 0, (tree)gimple_vuse_ptr (stmt)); |
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502 } |
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503 |
0 | 504 new_list.next = NULL; |
505 last = &new_list; | |
506 | |
507 old_ops = gimple_use_ops (stmt); | |
508 | |
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509 /* Clear a no longer necessary VUSE. */ |
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510 if (build_vuse == NULL_TREE |
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511 && gimple_vuse (stmt) != NULL_TREE) |
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512 gimple_set_vuse (stmt, NULL_TREE); |
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513 |
0 | 514 /* If there is anything in the old list, free it. */ |
515 if (old_ops) | |
516 { | |
517 for (ptr = old_ops; ptr; ptr = ptr->next) | |
518 delink_imm_use (USE_OP_PTR (ptr)); | |
519 old_ops->next = gimple_ssa_operands (cfun)->free_uses; | |
520 gimple_ssa_operands (cfun)->free_uses = old_ops; | |
521 } | |
522 | |
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523 /* If we added a VUSE, make sure to set the operand if it is not already |
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524 present and mark it for renaming. */ |
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525 if (build_vuse != NULL_TREE |
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526 && gimple_vuse (stmt) == NULL_TREE) |
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527 { |
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528 gimple_set_vuse (stmt, gimple_vop (cfun)); |
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529 mark_sym_for_renaming (gimple_vop (cfun)); |
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530 } |
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531 |
0 | 532 /* Now create nodes for all the new nodes. */ |
533 for (new_i = 0; new_i < VEC_length (tree, build_uses); new_i++) | |
55
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534 last = add_use_op (stmt, |
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535 (tree *) VEC_index (tree, build_uses, new_i), |
0 | 536 last); |
537 | |
538 /* Now set the stmt's operands. */ | |
539 gimple_set_use_ops (stmt, new_list.next); | |
540 } | |
541 | |
542 | |
543 /* Clear the in_list bits and empty the build array for VDEFs and | |
544 VUSEs. */ | |
545 | |
546 static inline void | |
547 cleanup_build_arrays (void) | |
548 { | |
55
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549 build_vdef = NULL_TREE; |
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550 build_vuse = NULL_TREE; |
0 | 551 VEC_truncate (tree, build_defs, 0); |
552 VEC_truncate (tree, build_uses, 0); | |
553 } | |
554 | |
555 | |
556 /* Finalize all the build vectors, fill the new ones into INFO. */ | |
55
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557 |
0 | 558 static inline void |
559 finalize_ssa_stmt_operands (gimple stmt) | |
560 { | |
561 finalize_ssa_defs (stmt); | |
562 finalize_ssa_uses (stmt); | |
563 cleanup_build_arrays (); | |
564 } | |
565 | |
566 | |
567 /* Start the process of building up operands vectors in INFO. */ | |
568 | |
569 static inline void | |
570 start_ssa_stmt_operands (void) | |
571 { | |
572 gcc_assert (VEC_length (tree, build_defs) == 0); | |
573 gcc_assert (VEC_length (tree, build_uses) == 0); | |
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574 gcc_assert (build_vuse == NULL_TREE); |
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575 gcc_assert (build_vdef == NULL_TREE); |
0 | 576 } |
577 | |
578 | |
579 /* Add DEF_P to the list of pointers to operands. */ | |
580 | |
581 static inline void | |
582 append_def (tree *def_p) | |
583 { | |
584 VEC_safe_push (tree, heap, build_defs, (tree) def_p); | |
585 } | |
586 | |
587 | |
588 /* Add USE_P to the list of pointers to operands. */ | |
589 | |
590 static inline void | |
591 append_use (tree *use_p) | |
592 { | |
593 VEC_safe_push (tree, heap, build_uses, (tree) use_p); | |
594 } | |
595 | |
596 | |
597 /* Add VAR to the set of variables that require a VDEF operator. */ | |
598 | |
599 static inline void | |
600 append_vdef (tree var) | |
601 { | |
55
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602 if (!optimize) |
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603 return; |
0 | 604 |
55
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605 gcc_assert ((build_vdef == NULL_TREE |
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606 || build_vdef == var) |
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607 && (build_vuse == NULL_TREE |
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608 || build_vuse == var)); |
0 | 609 |
55
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610 build_vdef = var; |
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611 build_vuse = var; |
0 | 612 } |
613 | |
614 | |
615 /* Add VAR to the set of variables that require a VUSE operator. */ | |
616 | |
617 static inline void | |
618 append_vuse (tree var) | |
619 { | |
55
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620 if (!optimize) |
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621 return; |
0 | 622 |
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623 gcc_assert (build_vuse == NULL_TREE |
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624 || build_vuse == var); |
0 | 625 |
55
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626 build_vuse = var; |
0 | 627 } |
628 | |
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629 /* Add virtual operands for STMT. FLAGS is as in get_expr_operands. */ |
0 | 630 |
631 static void | |
55
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632 add_virtual_operand (gimple stmt ATTRIBUTE_UNUSED, int flags) |
0 | 633 { |
55
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634 /* Add virtual operands to the stmt, unless the caller has specifically |
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635 requested not to do that (used when adding operands inside an |
0 | 636 ADDR_EXPR expression). */ |
637 if (flags & opf_no_vops) | |
638 return; | |
639 | |
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640 gcc_assert (!is_gimple_debug (stmt)); |
0 | 641 |
55
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642 if (flags & opf_def) |
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643 append_vdef (gimple_vop (cfun)); |
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644 else |
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645 append_vuse (gimple_vop (cfun)); |
0 | 646 } |
647 | |
648 | |
649 /* Add *VAR_P to the appropriate operand array for statement STMT. | |
650 FLAGS is as in get_expr_operands. If *VAR_P is a GIMPLE register, | |
651 it will be added to the statement's real operands, otherwise it is | |
652 added to virtual operands. */ | |
653 | |
654 static void | |
655 add_stmt_operand (tree *var_p, gimple stmt, int flags) | |
656 { | |
657 tree var, sym; | |
658 | |
659 gcc_assert (SSA_VAR_P (*var_p)); | |
660 | |
661 var = *var_p; | |
662 sym = (TREE_CODE (var) == SSA_NAME ? SSA_NAME_VAR (var) : var); | |
663 | |
664 /* Mark statements with volatile operands. */ | |
665 if (TREE_THIS_VOLATILE (sym)) | |
666 gimple_set_has_volatile_ops (stmt, true); | |
667 | |
668 if (is_gimple_reg (sym)) | |
669 { | |
670 /* The variable is a GIMPLE register. Add it to real operands. */ | |
671 if (flags & opf_def) | |
672 append_def (var_p); | |
673 else | |
674 append_use (var_p); | |
675 } | |
676 else | |
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677 add_virtual_operand (stmt, flags); |
0 | 678 } |
679 | |
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680 /* Mark the base address of REF as having its address taken. |
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681 REF may be a single variable whose address has been taken or any |
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682 other valid GIMPLE memory reference (structure reference, array, |
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683 etc). */ |
0 | 684 |
685 static void | |
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686 mark_address_taken (tree ref) |
0 | 687 { |
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688 tree var; |
0 | 689 |
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690 /* Note that it is *NOT OKAY* to use the target of a COMPONENT_REF |
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691 as the only thing we take the address of. If VAR is a structure, |
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692 taking the address of a field means that the whole structure may |
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693 be referenced using pointer arithmetic. See PR 21407 and the |
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694 ensuing mailing list discussion. */ |
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695 var = get_base_address (ref); |
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696 if (var && DECL_P (var)) |
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697 TREE_ADDRESSABLE (var) = 1; |
0 | 698 } |
699 | |
700 | |
701 /* A subroutine of get_expr_operands to handle INDIRECT_REF, | |
55
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702 ALIGN_INDIRECT_REF and MISALIGNED_INDIRECT_REF. |
0 | 703 |
704 STMT is the statement being processed, EXPR is the INDIRECT_REF | |
705 that got us here. | |
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706 |
0 | 707 FLAGS is as in get_expr_operands. |
708 | |
709 RECURSE_ON_BASE should be set to true if we want to continue | |
710 calling get_expr_operands on the base pointer, and false if | |
711 something else will do it for us. */ | |
712 | |
713 static void | |
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714 get_indirect_ref_operands (gimple stmt, tree expr, int flags, |
0 | 715 bool recurse_on_base) |
716 { | |
717 tree *pptr = &TREE_OPERAND (expr, 0); | |
718 | |
719 if (TREE_THIS_VOLATILE (expr)) | |
720 gimple_set_has_volatile_ops (stmt, true); | |
721 | |
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722 /* Add the VOP. */ |
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723 add_virtual_operand (stmt, flags); |
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724 |
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725 /* If requested, add a USE operand for the base pointer. */ |
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726 if (recurse_on_base) |
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727 get_expr_operands (stmt, pptr, |
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728 opf_use | (flags & opf_no_vops)); |
0 | 729 } |
730 | |
731 | |
732 /* A subroutine of get_expr_operands to handle TARGET_MEM_REF. */ | |
733 | |
734 static void | |
735 get_tmr_operands (gimple stmt, tree expr, int flags) | |
736 { | |
63
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737 if (TREE_THIS_VOLATILE (expr)) |
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738 gimple_set_has_volatile_ops (stmt, true); |
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739 |
0 | 740 /* First record the real operands. */ |
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741 get_expr_operands (stmt, &TMR_BASE (expr), opf_use | (flags & opf_no_vops)); |
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742 get_expr_operands (stmt, &TMR_INDEX (expr), opf_use | (flags & opf_no_vops)); |
0 | 743 |
744 if (TMR_SYMBOL (expr)) | |
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745 mark_address_taken (TMR_SYMBOL (expr)); |
0 | 746 |
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747 add_virtual_operand (stmt, flags); |
0 | 748 } |
749 | |
750 | |
751 /* If STMT is a call that may clobber globals and other symbols that | |
752 escape, add them to the VDEF/VUSE lists for it. */ | |
753 | |
754 static void | |
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755 maybe_add_call_vops (gimple stmt) |
0 | 756 { |
757 int call_flags = gimple_call_flags (stmt); | |
758 | |
759 /* If aliases have been computed already, add VDEF or VUSE | |
760 operands for all the symbols that have been found to be | |
761 call-clobbered. */ | |
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762 if (!(call_flags & ECF_NOVOPS)) |
0 | 763 { |
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764 /* A 'pure' or a 'const' function never call-clobbers anything. |
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765 A 'noreturn' function might, but since we don't return anyway |
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766 there is no point in recording that. */ |
0 | 767 if (!(call_flags & (ECF_PURE | ECF_CONST | ECF_NORETURN))) |
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768 add_virtual_operand (stmt, opf_def); |
0 | 769 else if (!(call_flags & ECF_CONST)) |
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770 add_virtual_operand (stmt, opf_use); |
0 | 771 } |
772 } | |
773 | |
774 | |
775 /* Scan operands in the ASM_EXPR stmt referred to in INFO. */ | |
776 | |
777 static void | |
778 get_asm_expr_operands (gimple stmt) | |
779 { | |
780 size_t i, noutputs; | |
781 const char **oconstraints; | |
782 const char *constraint; | |
783 bool allows_mem, allows_reg, is_inout; | |
784 | |
785 noutputs = gimple_asm_noutputs (stmt); | |
786 oconstraints = (const char **) alloca ((noutputs) * sizeof (const char *)); | |
787 | |
788 /* Gather all output operands. */ | |
789 for (i = 0; i < gimple_asm_noutputs (stmt); i++) | |
790 { | |
791 tree link = gimple_asm_output_op (stmt, i); | |
792 constraint = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link))); | |
793 oconstraints[i] = constraint; | |
794 parse_output_constraint (&constraint, i, 0, 0, &allows_mem, | |
795 &allows_reg, &is_inout); | |
796 | |
797 /* This should have been split in gimplify_asm_expr. */ | |
798 gcc_assert (!allows_reg || !is_inout); | |
799 | |
800 /* Memory operands are addressable. Note that STMT needs the | |
801 address of this operand. */ | |
802 if (!allows_reg && allows_mem) | |
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803 mark_address_taken (TREE_VALUE (link)); |
0 | 804 |
805 get_expr_operands (stmt, &TREE_VALUE (link), opf_def); | |
806 } | |
807 | |
808 /* Gather all input operands. */ | |
809 for (i = 0; i < gimple_asm_ninputs (stmt); i++) | |
810 { | |
811 tree link = gimple_asm_input_op (stmt, i); | |
812 constraint = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link))); | |
813 parse_input_constraint (&constraint, 0, 0, noutputs, 0, oconstraints, | |
814 &allows_mem, &allows_reg); | |
815 | |
816 /* Memory operands are addressable. Note that STMT needs the | |
817 address of this operand. */ | |
818 if (!allows_reg && allows_mem) | |
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819 mark_address_taken (TREE_VALUE (link)); |
0 | 820 |
821 get_expr_operands (stmt, &TREE_VALUE (link), 0); | |
822 } | |
823 | |
824 /* Clobber all memory and addressable symbols for asm ("" : : : "memory"); */ | |
825 for (i = 0; i < gimple_asm_nclobbers (stmt); i++) | |
826 { | |
827 tree link = gimple_asm_clobber_op (stmt, i); | |
828 if (strcmp (TREE_STRING_POINTER (TREE_VALUE (link)), "memory") == 0) | |
829 { | |
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830 add_virtual_operand (stmt, opf_def); |
0 | 831 break; |
832 } | |
833 } | |
834 } | |
835 | |
836 | |
837 /* Recursively scan the expression pointed to by EXPR_P in statement | |
838 STMT. FLAGS is one of the OPF_* constants modifying how to | |
839 interpret the operands found. */ | |
840 | |
841 static void | |
842 get_expr_operands (gimple stmt, tree *expr_p, int flags) | |
843 { | |
844 enum tree_code code; | |
845 enum tree_code_class codeclass; | |
846 tree expr = *expr_p; | |
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847 int uflags = opf_use; |
0 | 848 |
849 if (expr == NULL) | |
850 return; | |
851 | |
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852 if (is_gimple_debug (stmt)) |
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853 uflags |= (flags & opf_no_vops); |
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854 |
0 | 855 code = TREE_CODE (expr); |
856 codeclass = TREE_CODE_CLASS (code); | |
857 | |
858 switch (code) | |
859 { | |
860 case ADDR_EXPR: | |
861 /* Taking the address of a variable does not represent a | |
862 reference to it, but the fact that the statement takes its | |
863 address will be of interest to some passes (e.g. alias | |
864 resolution). */ | |
55
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865 if (!is_gimple_debug (stmt)) |
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866 mark_address_taken (TREE_OPERAND (expr, 0)); |
0 | 867 |
868 /* If the address is invariant, there may be no interesting | |
869 variable references inside. */ | |
870 if (is_gimple_min_invariant (expr)) | |
871 return; | |
872 | |
873 /* Otherwise, there may be variables referenced inside but there | |
874 should be no VUSEs created, since the referenced objects are | |
875 not really accessed. The only operands that we should find | |
876 here are ARRAY_REF indices which will always be real operands | |
877 (GIMPLE does not allow non-registers as array indices). */ | |
878 flags |= opf_no_vops; | |
879 get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags); | |
880 return; | |
881 | |
882 case SSA_NAME: | |
883 add_stmt_operand (expr_p, stmt, flags); | |
884 return; | |
885 | |
886 case VAR_DECL: | |
887 case PARM_DECL: | |
888 case RESULT_DECL: | |
889 add_stmt_operand (expr_p, stmt, flags); | |
890 return; | |
891 | |
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892 case DEBUG_EXPR_DECL: |
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893 gcc_assert (gimple_debug_bind_p (stmt)); |
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894 return; |
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895 |
0 | 896 case MISALIGNED_INDIRECT_REF: |
897 get_expr_operands (stmt, &TREE_OPERAND (expr, 1), flags); | |
898 /* fall through */ | |
899 | |
900 case ALIGN_INDIRECT_REF: | |
901 case INDIRECT_REF: | |
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902 get_indirect_ref_operands (stmt, expr, flags, true); |
0 | 903 return; |
904 | |
905 case TARGET_MEM_REF: | |
906 get_tmr_operands (stmt, expr, flags); | |
907 return; | |
908 | |
909 case ARRAY_REF: | |
910 case ARRAY_RANGE_REF: | |
911 case COMPONENT_REF: | |
912 case REALPART_EXPR: | |
913 case IMAGPART_EXPR: | |
914 { | |
915 if (TREE_THIS_VOLATILE (expr)) | |
916 gimple_set_has_volatile_ops (stmt, true); | |
917 | |
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918 get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags); |
0 | 919 |
920 if (code == COMPONENT_REF) | |
921 { | |
922 if (TREE_THIS_VOLATILE (TREE_OPERAND (expr, 1))) | |
923 gimple_set_has_volatile_ops (stmt, true); | |
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924 get_expr_operands (stmt, &TREE_OPERAND (expr, 2), uflags); |
0 | 925 } |
926 else if (code == ARRAY_REF || code == ARRAY_RANGE_REF) | |
927 { | |
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928 get_expr_operands (stmt, &TREE_OPERAND (expr, 1), uflags); |
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929 get_expr_operands (stmt, &TREE_OPERAND (expr, 2), uflags); |
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930 get_expr_operands (stmt, &TREE_OPERAND (expr, 3), uflags); |
0 | 931 } |
932 | |
933 return; | |
934 } | |
935 | |
936 case WITH_SIZE_EXPR: | |
937 /* WITH_SIZE_EXPR is a pass-through reference to its first argument, | |
938 and an rvalue reference to its second argument. */ | |
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939 get_expr_operands (stmt, &TREE_OPERAND (expr, 1), uflags); |
0 | 940 get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags); |
941 return; | |
942 | |
943 case COND_EXPR: | |
944 case VEC_COND_EXPR: | |
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945 get_expr_operands (stmt, &TREE_OPERAND (expr, 0), uflags); |
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946 get_expr_operands (stmt, &TREE_OPERAND (expr, 1), uflags); |
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947 get_expr_operands (stmt, &TREE_OPERAND (expr, 2), uflags); |
0 | 948 return; |
949 | |
950 case CONSTRUCTOR: | |
951 { | |
952 /* General aggregate CONSTRUCTORs have been decomposed, but they | |
953 are still in use as the COMPLEX_EXPR equivalent for vectors. */ | |
954 constructor_elt *ce; | |
955 unsigned HOST_WIDE_INT idx; | |
956 | |
957 for (idx = 0; | |
958 VEC_iterate (constructor_elt, CONSTRUCTOR_ELTS (expr), idx, ce); | |
959 idx++) | |
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960 get_expr_operands (stmt, &ce->value, uflags); |
0 | 961 |
962 return; | |
963 } | |
964 | |
965 case BIT_FIELD_REF: | |
966 if (TREE_THIS_VOLATILE (expr)) | |
967 gimple_set_has_volatile_ops (stmt, true); | |
968 /* FALLTHRU */ | |
969 | |
970 case TRUTH_NOT_EXPR: | |
971 case VIEW_CONVERT_EXPR: | |
972 do_unary: | |
973 get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags); | |
974 return; | |
975 | |
976 case TRUTH_AND_EXPR: | |
977 case TRUTH_OR_EXPR: | |
978 case TRUTH_XOR_EXPR: | |
979 case COMPOUND_EXPR: | |
980 case OBJ_TYPE_REF: | |
981 case ASSERT_EXPR: | |
982 do_binary: | |
983 { | |
984 get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags); | |
985 get_expr_operands (stmt, &TREE_OPERAND (expr, 1), flags); | |
986 return; | |
987 } | |
988 | |
989 case DOT_PROD_EXPR: | |
990 case REALIGN_LOAD_EXPR: | |
991 { | |
992 get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags); | |
993 get_expr_operands (stmt, &TREE_OPERAND (expr, 1), flags); | |
994 get_expr_operands (stmt, &TREE_OPERAND (expr, 2), flags); | |
995 return; | |
996 } | |
997 | |
998 case FUNCTION_DECL: | |
999 case LABEL_DECL: | |
1000 case CONST_DECL: | |
1001 case CASE_LABEL_EXPR: | |
1002 /* Expressions that make no memory references. */ | |
1003 return; | |
1004 | |
1005 default: | |
1006 if (codeclass == tcc_unary) | |
1007 goto do_unary; | |
1008 if (codeclass == tcc_binary || codeclass == tcc_comparison) | |
1009 goto do_binary; | |
1010 if (codeclass == tcc_constant || codeclass == tcc_type) | |
1011 return; | |
1012 } | |
1013 | |
1014 /* If we get here, something has gone wrong. */ | |
1015 #ifdef ENABLE_CHECKING | |
1016 fprintf (stderr, "unhandled expression in get_expr_operands():\n"); | |
1017 debug_tree (expr); | |
1018 fputs ("\n", stderr); | |
1019 #endif | |
1020 gcc_unreachable (); | |
1021 } | |
1022 | |
1023 | |
1024 /* Parse STMT looking for operands. When finished, the various | |
1025 build_* operand vectors will have potential operands in them. */ | |
1026 | |
1027 static void | |
1028 parse_ssa_operands (gimple stmt) | |
1029 { | |
1030 enum gimple_code code = gimple_code (stmt); | |
1031 | |
1032 if (code == GIMPLE_ASM) | |
1033 get_asm_expr_operands (stmt); | |
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1034 else if (is_gimple_debug (stmt)) |
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1035 { |
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1036 if (gimple_debug_bind_p (stmt) |
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1037 && gimple_debug_bind_has_value_p (stmt)) |
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1038 get_expr_operands (stmt, gimple_debug_bind_get_value_ptr (stmt), |
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1039 opf_use | opf_no_vops); |
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1040 } |
0 | 1041 else |
1042 { | |
1043 size_t i, start = 0; | |
1044 | |
1045 if (code == GIMPLE_ASSIGN || code == GIMPLE_CALL) | |
1046 { | |
1047 get_expr_operands (stmt, gimple_op_ptr (stmt, 0), opf_def); | |
1048 start = 1; | |
1049 } | |
1050 | |
1051 for (i = start; i < gimple_num_ops (stmt); i++) | |
1052 get_expr_operands (stmt, gimple_op_ptr (stmt, i), opf_use); | |
1053 | |
1054 /* Add call-clobbered operands, if needed. */ | |
1055 if (code == GIMPLE_CALL) | |
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1056 maybe_add_call_vops (stmt); |
0 | 1057 } |
1058 } | |
1059 | |
1060 | |
1061 /* Create an operands cache for STMT. */ | |
1062 | |
1063 static void | |
1064 build_ssa_operands (gimple stmt) | |
1065 { | |
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1066 /* Initially assume that the statement has no volatile operands. */ |
0 | 1067 gimple_set_has_volatile_ops (stmt, false); |
1068 | |
1069 start_ssa_stmt_operands (); | |
1070 parse_ssa_operands (stmt); | |
1071 finalize_ssa_stmt_operands (stmt); | |
1072 } | |
1073 | |
1074 | |
1075 /* Releases the operands of STMT back to their freelists, and clears | |
1076 the stmt operand lists. */ | |
1077 | |
1078 void | |
1079 free_stmt_operands (gimple stmt) | |
1080 { | |
1081 def_optype_p defs = gimple_def_ops (stmt), last_def; | |
1082 use_optype_p uses = gimple_use_ops (stmt), last_use; | |
1083 | |
1084 if (defs) | |
1085 { | |
1086 for (last_def = defs; last_def->next; last_def = last_def->next) | |
1087 continue; | |
1088 last_def->next = gimple_ssa_operands (cfun)->free_defs; | |
1089 gimple_ssa_operands (cfun)->free_defs = defs; | |
1090 gimple_set_def_ops (stmt, NULL); | |
1091 } | |
1092 | |
1093 if (uses) | |
1094 { | |
1095 for (last_use = uses; last_use->next; last_use = last_use->next) | |
1096 delink_imm_use (USE_OP_PTR (last_use)); | |
1097 delink_imm_use (USE_OP_PTR (last_use)); | |
1098 last_use->next = gimple_ssa_operands (cfun)->free_uses; | |
1099 gimple_ssa_operands (cfun)->free_uses = uses; | |
1100 gimple_set_use_ops (stmt, NULL); | |
1101 } | |
1102 | |
1103 if (gimple_has_mem_ops (stmt)) | |
1104 { | |
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1105 gimple_set_vuse (stmt, NULL_TREE); |
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1106 gimple_set_vdef (stmt, NULL_TREE); |
0 | 1107 } |
1108 } | |
1109 | |
1110 | |
1111 /* Get the operands of statement STMT. */ | |
1112 | |
1113 void | |
1114 update_stmt_operands (gimple stmt) | |
1115 { | |
1116 /* If update_stmt_operands is called before SSA is initialized, do | |
1117 nothing. */ | |
1118 if (!ssa_operands_active ()) | |
1119 return; | |
1120 | |
1121 timevar_push (TV_TREE_OPS); | |
1122 | |
1123 gcc_assert (gimple_modified_p (stmt)); | |
1124 build_ssa_operands (stmt); | |
1125 gimple_set_modified (stmt, false); | |
1126 | |
1127 timevar_pop (TV_TREE_OPS); | |
1128 } | |
1129 | |
1130 | |
1131 /* Swap operands EXP0 and EXP1 in statement STMT. No attempt is done | |
1132 to test the validity of the swap operation. */ | |
1133 | |
1134 void | |
1135 swap_tree_operands (gimple stmt, tree *exp0, tree *exp1) | |
1136 { | |
1137 tree op0, op1; | |
1138 op0 = *exp0; | |
1139 op1 = *exp1; | |
1140 | |
1141 /* If the operand cache is active, attempt to preserve the relative | |
1142 positions of these two operands in their respective immediate use | |
1143 lists. */ | |
1144 if (ssa_operands_active () && op0 != op1) | |
1145 { | |
1146 use_optype_p use0, use1, ptr; | |
1147 use0 = use1 = NULL; | |
1148 | |
1149 /* Find the 2 operands in the cache, if they are there. */ | |
1150 for (ptr = gimple_use_ops (stmt); ptr; ptr = ptr->next) | |
1151 if (USE_OP_PTR (ptr)->use == exp0) | |
1152 { | |
1153 use0 = ptr; | |
1154 break; | |
1155 } | |
1156 | |
1157 for (ptr = gimple_use_ops (stmt); ptr; ptr = ptr->next) | |
1158 if (USE_OP_PTR (ptr)->use == exp1) | |
1159 { | |
1160 use1 = ptr; | |
1161 break; | |
1162 } | |
1163 | |
1164 /* If both uses don't have operand entries, there isn't much we can do | |
1165 at this point. Presumably we don't need to worry about it. */ | |
1166 if (use0 && use1) | |
1167 { | |
1168 tree *tmp = USE_OP_PTR (use1)->use; | |
1169 USE_OP_PTR (use1)->use = USE_OP_PTR (use0)->use; | |
1170 USE_OP_PTR (use0)->use = tmp; | |
1171 } | |
1172 } | |
1173 | |
1174 /* Now swap the data. */ | |
1175 *exp0 = op1; | |
1176 *exp1 = op0; | |
1177 } | |
1178 | |
1179 | |
1180 /* Scan the immediate_use list for VAR making sure its linked properly. | |
1181 Return TRUE if there is a problem and emit an error message to F. */ | |
1182 | |
1183 bool | |
1184 verify_imm_links (FILE *f, tree var) | |
1185 { | |
1186 use_operand_p ptr, prev, list; | |
1187 int count; | |
1188 | |
1189 gcc_assert (TREE_CODE (var) == SSA_NAME); | |
1190 | |
1191 list = &(SSA_NAME_IMM_USE_NODE (var)); | |
1192 gcc_assert (list->use == NULL); | |
1193 | |
1194 if (list->prev == NULL) | |
1195 { | |
1196 gcc_assert (list->next == NULL); | |
1197 return false; | |
1198 } | |
1199 | |
1200 prev = list; | |
1201 count = 0; | |
1202 for (ptr = list->next; ptr != list; ) | |
1203 { | |
1204 if (prev != ptr->prev) | |
1205 goto error; | |
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1206 |
0 | 1207 if (ptr->use == NULL) |
1208 goto error; /* 2 roots, or SAFE guard node. */ | |
1209 else if (*(ptr->use) != var) | |
1210 goto error; | |
1211 | |
1212 prev = ptr; | |
1213 ptr = ptr->next; | |
1214 | |
1215 /* Avoid infinite loops. 50,000,000 uses probably indicates a | |
1216 problem. */ | |
1217 if (count++ > 50000000) | |
1218 goto error; | |
1219 } | |
1220 | |
1221 /* Verify list in the other direction. */ | |
1222 prev = list; | |
1223 for (ptr = list->prev; ptr != list; ) | |
1224 { | |
1225 if (prev != ptr->next) | |
1226 goto error; | |
1227 prev = ptr; | |
1228 ptr = ptr->prev; | |
1229 if (count-- < 0) | |
1230 goto error; | |
1231 } | |
1232 | |
1233 if (count != 0) | |
1234 goto error; | |
1235 | |
1236 return false; | |
1237 | |
1238 error: | |
1239 if (ptr->loc.stmt && gimple_modified_p (ptr->loc.stmt)) | |
1240 { | |
1241 fprintf (f, " STMT MODIFIED. - <%p> ", (void *)ptr->loc.stmt); | |
1242 print_gimple_stmt (f, ptr->loc.stmt, 0, TDF_SLIM); | |
1243 } | |
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1244 fprintf (f, " IMM ERROR : (use_p : tree - %p:%p)", (void *)ptr, |
0 | 1245 (void *)ptr->use); |
1246 print_generic_expr (f, USE_FROM_PTR (ptr), TDF_SLIM); | |
1247 fprintf(f, "\n"); | |
1248 return true; | |
1249 } | |
1250 | |
1251 | |
1252 /* Dump all the immediate uses to FILE. */ | |
1253 | |
1254 void | |
1255 dump_immediate_uses_for (FILE *file, tree var) | |
1256 { | |
1257 imm_use_iterator iter; | |
1258 use_operand_p use_p; | |
1259 | |
1260 gcc_assert (var && TREE_CODE (var) == SSA_NAME); | |
1261 | |
1262 print_generic_expr (file, var, TDF_SLIM); | |
1263 fprintf (file, " : -->"); | |
1264 if (has_zero_uses (var)) | |
1265 fprintf (file, " no uses.\n"); | |
1266 else | |
1267 if (has_single_use (var)) | |
1268 fprintf (file, " single use.\n"); | |
1269 else | |
1270 fprintf (file, "%d uses.\n", num_imm_uses (var)); | |
1271 | |
1272 FOR_EACH_IMM_USE_FAST (use_p, iter, var) | |
1273 { | |
1274 if (use_p->loc.stmt == NULL && use_p->use == NULL) | |
1275 fprintf (file, "***end of stmt iterator marker***\n"); | |
1276 else | |
1277 if (!is_gimple_reg (USE_FROM_PTR (use_p))) | |
1278 print_gimple_stmt (file, USE_STMT (use_p), 0, TDF_VOPS|TDF_MEMSYMS); | |
1279 else | |
1280 print_gimple_stmt (file, USE_STMT (use_p), 0, TDF_SLIM); | |
1281 } | |
1282 fprintf(file, "\n"); | |
1283 } | |
1284 | |
1285 | |
1286 /* Dump all the immediate uses to FILE. */ | |
1287 | |
1288 void | |
1289 dump_immediate_uses (FILE *file) | |
1290 { | |
1291 tree var; | |
1292 unsigned int x; | |
1293 | |
1294 fprintf (file, "Immediate_uses: \n\n"); | |
1295 for (x = 1; x < num_ssa_names; x++) | |
1296 { | |
1297 var = ssa_name(x); | |
1298 if (!var) | |
1299 continue; | |
1300 dump_immediate_uses_for (file, var); | |
1301 } | |
1302 } | |
1303 | |
1304 | |
1305 /* Dump def-use edges on stderr. */ | |
1306 | |
1307 void | |
1308 debug_immediate_uses (void) | |
1309 { | |
1310 dump_immediate_uses (stderr); | |
1311 } | |
1312 | |
1313 | |
1314 /* Dump def-use edges on stderr. */ | |
1315 | |
1316 void | |
1317 debug_immediate_uses_for (tree var) | |
1318 { | |
1319 dump_immediate_uses_for (stderr, var); | |
1320 } | |
1321 | |
1322 | |
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1323 /* Unlink STMTs virtual definition from the IL by propagating its use. */ |
0 | 1324 |
1325 void | |
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1326 unlink_stmt_vdef (gimple stmt) |
0 | 1327 { |
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1328 use_operand_p use_p; |
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1329 imm_use_iterator iter; |
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1330 gimple use_stmt; |
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1331 tree vdef = gimple_vdef (stmt); |
0 | 1332 |
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1333 if (!vdef |
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1334 || TREE_CODE (vdef) != SSA_NAME) |
0 | 1335 return; |
1336 | |
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1337 FOR_EACH_IMM_USE_STMT (use_stmt, iter, gimple_vdef (stmt)) |
0 | 1338 { |
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1339 FOR_EACH_IMM_USE_ON_STMT (use_p, iter) |
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1340 SET_USE (use_p, gimple_vuse (stmt)); |
0 | 1341 } |
1342 | |
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1343 if (SSA_NAME_OCCURS_IN_ABNORMAL_PHI (gimple_vdef (stmt))) |
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1344 SSA_NAME_OCCURS_IN_ABNORMAL_PHI (gimple_vuse (stmt)) = 1; |
0 | 1345 } |
1346 |