Mercurial > hg > CbC > CbC_gcc
annotate gcc/tree-ssa-operands.c @ 132:d34655255c78
update gcc-8.2
author | mir3636 |
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date | Thu, 25 Oct 2018 10:21:07 +0900 |
parents | f81c5aa9f14f 84e7813d76e9 |
children | 4e440907fcbf |
rev | line source |
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0 | 1 /* SSA operands management for trees. |
131 | 2 Copyright (C) 2003-2018 Free Software Foundation, Inc. |
0 | 3 |
4 This file is part of GCC. | |
5 | |
6 GCC is free software; you can redistribute it and/or modify | |
7 it under the terms of the GNU General Public License as published by | |
8 the Free Software Foundation; either version 3, or (at your option) | |
9 any later version. | |
10 | |
11 GCC is distributed in the hope that it will be useful, | |
12 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 GNU General Public License for more details. | |
15 | |
16 You should have received a copy of the GNU General Public License | |
17 along with GCC; see the file COPYING3. If not see | |
18 <http://www.gnu.org/licenses/>. */ | |
19 | |
20 #include "config.h" | |
21 #include "system.h" | |
22 #include "coretypes.h" | |
111 | 23 #include "backend.h" |
0 | 24 #include "tree.h" |
111 | 25 #include "gimple.h" |
26 #include "timevar.h" | |
27 #include "ssa.h" | |
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28 #include "gimple-pretty-print.h" |
111 | 29 #include "diagnostic-core.h" |
30 #include "stmt.h" | |
31 #include "print-tree.h" | |
32 #include "dumpfile.h" | |
1 | 33 #ifndef noCbC |
117 | 34 #include "c/cbc-tree.h" |
1 | 35 #endif |
0 | 36 |
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37 /* This file contains the code required to manage the operands cache of the |
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38 SSA optimizer. For every stmt, we maintain an operand cache in the stmt |
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39 annotation. This cache contains operands that will be of interest to |
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40 optimizers and other passes wishing to manipulate the IL. |
0 | 41 |
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42 The operand type are broken up into REAL and VIRTUAL operands. The real |
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43 operands are represented as pointers into the stmt's operand tree. Thus |
0 | 44 any manipulation of the real operands will be reflected in the actual tree. |
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45 Virtual operands are represented solely in the cache, although the base |
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46 variable for the SSA_NAME may, or may not occur in the stmt's tree. |
0 | 47 Manipulation of the virtual operands will not be reflected in the stmt tree. |
48 | |
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49 The routines in this file are concerned with creating this operand cache |
0 | 50 from a stmt tree. |
51 | |
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52 The operand tree is the parsed by the various get_* routines which look |
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53 through the stmt tree for the occurrence of operands which may be of |
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54 interest, and calls are made to the append_* routines whenever one is |
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55 found. There are 4 of these routines, each representing one of the |
0 | 56 4 types of operands. Defs, Uses, Virtual Uses, and Virtual May Defs. |
57 | |
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58 The append_* routines check for duplication, and simply keep a list of |
0 | 59 unique objects for each operand type in the build_* extendable vectors. |
60 | |
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61 Once the stmt tree is completely parsed, the finalize_ssa_operands() |
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62 routine is called, which proceeds to perform the finalization routine |
0 | 63 on each of the 4 operand vectors which have been built up. |
64 | |
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65 If the stmt had a previous operand cache, the finalization routines |
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66 attempt to match up the new operands with the old ones. If it's a perfect |
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67 match, the old vector is simply reused. If it isn't a perfect match, then |
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68 a new vector is created and the new operands are placed there. For |
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69 virtual operands, if the previous cache had SSA_NAME version of a |
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70 variable, and that same variable occurs in the same operands cache, then |
0 | 71 the new cache vector will also get the same SSA_NAME. |
72 | |
73 i.e., if a stmt had a VUSE of 'a_5', and 'a' occurs in the new | |
74 operand vector for VUSE, then the new vector will also be modified | |
75 such that it contains 'a_5' rather than 'a'. */ | |
76 | |
77 | |
78 /* Flags to describe operand properties in helpers. */ | |
79 | |
80 /* By default, operands are loaded. */ | |
81 #define opf_use 0 | |
82 | |
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83 /* Operand is the target of an assignment expression or a |
0 | 84 call-clobbered variable. */ |
85 #define opf_def (1 << 0) | |
86 | |
87 /* No virtual operands should be created in the expression. This is used | |
88 when traversing ADDR_EXPR nodes which have different semantics than | |
89 other expressions. Inside an ADDR_EXPR node, the only operands that we | |
90 need to consider are indices into arrays. For instance, &a.b[i] should | |
91 generate a USE of 'i' but it should not generate a VUSE for 'a' nor a | |
92 VUSE for 'b'. */ | |
93 #define opf_no_vops (1 << 1) | |
94 | |
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95 /* Operand is in a place where address-taken does not imply addressable. */ |
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96 #define opf_non_addressable (1 << 3) |
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97 |
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98 /* Operand is in a place where opf_non_addressable does not apply. */ |
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99 #define opf_not_non_addressable (1 << 4) |
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100 |
111 | 101 /* Operand is having its address taken. */ |
102 #define opf_address_taken (1 << 5) | |
0 | 103 |
104 /* Array for building all the use operands. */ | |
111 | 105 static vec<tree *> build_uses; |
0 | 106 |
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107 /* The built VDEF operand. */ |
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108 static tree build_vdef; |
0 | 109 |
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110 /* The built VUSE operand. */ |
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111 static tree build_vuse; |
0 | 112 |
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113 /* Bitmap obstack for our datastructures that needs to survive across |
0 | 114 compilations of multiple functions. */ |
115 static bitmap_obstack operands_bitmap_obstack; | |
116 | |
111 | 117 static void get_expr_operands (struct function *, gimple *, tree *, int); |
0 | 118 |
119 /* Number of functions with initialized ssa_operands. */ | |
120 static int n_initialized = 0; | |
121 | |
111 | 122 /* Accessor to tree-ssa-operands.c caches. */ |
123 static inline struct ssa_operands * | |
124 gimple_ssa_operands (const struct function *fun) | |
0 | 125 { |
111 | 126 return &fun->gimple_df->ssa_operands; |
0 | 127 } |
128 | |
129 | |
130 /* Return true if the SSA operands cache is active. */ | |
131 | |
132 bool | |
111 | 133 ssa_operands_active (struct function *fun) |
0 | 134 { |
111 | 135 if (fun == NULL) |
0 | 136 return false; |
137 | |
111 | 138 return fun->gimple_df && gimple_ssa_operands (fun)->ops_active; |
0 | 139 } |
140 | |
141 | |
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142 /* Create the VOP variable, an artificial global variable to act as a |
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143 representative of all of the virtual operands FUD chain. */ |
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144 |
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145 static void |
111 | 146 create_vop_var (struct function *fn) |
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147 { |
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148 tree global_var; |
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149 |
111 | 150 gcc_assert (fn->gimple_df->vop == NULL_TREE); |
0 | 151 |
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152 global_var = build_decl (BUILTINS_LOCATION, VAR_DECL, |
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153 get_identifier (".MEM"), |
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154 void_type_node); |
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155 DECL_ARTIFICIAL (global_var) = 1; |
111 | 156 DECL_IGNORED_P (global_var) = 1; |
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157 TREE_READONLY (global_var) = 0; |
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158 DECL_EXTERNAL (global_var) = 1; |
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159 TREE_STATIC (global_var) = 1; |
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160 TREE_USED (global_var) = 1; |
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161 DECL_CONTEXT (global_var) = NULL_TREE; |
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162 TREE_THIS_VOLATILE (global_var) = 0; |
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163 TREE_ADDRESSABLE (global_var) = 0; |
111 | 164 VAR_DECL_IS_VIRTUAL_OPERAND (global_var) = 1; |
0 | 165 |
111 | 166 fn->gimple_df->vop = global_var; |
0 | 167 } |
168 | |
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169 /* These are the sizes of the operand memory buffer in bytes which gets |
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170 allocated each time more operands space is required. The final value is |
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171 the amount that is allocated every time after that. |
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172 In 1k we can fit 25 use operands (or 63 def operands) on a host with |
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173 8 byte pointers, that would be 10 statements each with 1 def and 2 |
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174 uses. */ |
0 | 175 |
176 #define OP_SIZE_INIT 0 | |
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177 #define OP_SIZE_1 (1024 - sizeof (void *)) |
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178 #define OP_SIZE_2 (1024 * 4 - sizeof (void *)) |
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179 #define OP_SIZE_3 (1024 * 16 - sizeof (void *)) |
0 | 180 |
181 /* Initialize the operand cache routines. */ | |
182 | |
183 void | |
111 | 184 init_ssa_operands (struct function *fn) |
0 | 185 { |
186 if (!n_initialized++) | |
187 { | |
111 | 188 build_uses.create (10); |
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189 build_vuse = NULL_TREE; |
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190 build_vdef = NULL_TREE; |
0 | 191 bitmap_obstack_initialize (&operands_bitmap_obstack); |
192 } | |
193 | |
111 | 194 gcc_assert (gimple_ssa_operands (fn)->operand_memory == NULL); |
195 gimple_ssa_operands (fn)->operand_memory_index | |
196 = gimple_ssa_operands (fn)->ssa_operand_mem_size; | |
197 gimple_ssa_operands (fn)->ops_active = true; | |
198 gimple_ssa_operands (fn)->ssa_operand_mem_size = OP_SIZE_INIT; | |
199 create_vop_var (fn); | |
0 | 200 } |
201 | |
202 | |
203 /* Dispose of anything required by the operand routines. */ | |
204 | |
205 void | |
111 | 206 fini_ssa_operands (struct function *fn) |
0 | 207 { |
208 struct ssa_operand_memory_d *ptr; | |
209 | |
210 if (!--n_initialized) | |
211 { | |
111 | 212 build_uses.release (); |
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213 build_vdef = NULL_TREE; |
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214 build_vuse = NULL_TREE; |
0 | 215 } |
216 | |
111 | 217 gimple_ssa_operands (fn)->free_uses = NULL; |
0 | 218 |
111 | 219 while ((ptr = gimple_ssa_operands (fn)->operand_memory) != NULL) |
0 | 220 { |
111 | 221 gimple_ssa_operands (fn)->operand_memory |
222 = gimple_ssa_operands (fn)->operand_memory->next; | |
0 | 223 ggc_free (ptr); |
224 } | |
225 | |
111 | 226 gimple_ssa_operands (fn)->ops_active = false; |
0 | 227 |
228 if (!n_initialized) | |
229 bitmap_obstack_release (&operands_bitmap_obstack); | |
230 | |
111 | 231 fn->gimple_df->vop = NULL_TREE; |
0 | 232 } |
233 | |
234 | |
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235 /* Return memory for an operand of size SIZE. */ |
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236 |
0 | 237 static inline void * |
111 | 238 ssa_operand_alloc (struct function *fn, unsigned size) |
0 | 239 { |
240 char *ptr; | |
241 | |
111 | 242 gcc_assert (size == sizeof (struct use_optype_d)); |
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243 |
111 | 244 if (gimple_ssa_operands (fn)->operand_memory_index + size |
245 >= gimple_ssa_operands (fn)->ssa_operand_mem_size) | |
0 | 246 { |
247 struct ssa_operand_memory_d *ptr; | |
248 | |
111 | 249 switch (gimple_ssa_operands (fn)->ssa_operand_mem_size) |
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250 { |
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251 case OP_SIZE_INIT: |
111 | 252 gimple_ssa_operands (fn)->ssa_operand_mem_size = OP_SIZE_1; |
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253 break; |
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254 case OP_SIZE_1: |
111 | 255 gimple_ssa_operands (fn)->ssa_operand_mem_size = OP_SIZE_2; |
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256 break; |
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257 case OP_SIZE_2: |
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258 case OP_SIZE_3: |
111 | 259 gimple_ssa_operands (fn)->ssa_operand_mem_size = OP_SIZE_3; |
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260 break; |
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261 default: |
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262 gcc_unreachable (); |
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263 } |
0 | 264 |
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265 |
111 | 266 ptr = (ssa_operand_memory_d *) ggc_internal_alloc |
267 (sizeof (void *) + gimple_ssa_operands (fn)->ssa_operand_mem_size); | |
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268 |
111 | 269 ptr->next = gimple_ssa_operands (fn)->operand_memory; |
270 gimple_ssa_operands (fn)->operand_memory = ptr; | |
271 gimple_ssa_operands (fn)->operand_memory_index = 0; | |
0 | 272 } |
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273 |
111 | 274 ptr = &(gimple_ssa_operands (fn)->operand_memory |
275 ->mem[gimple_ssa_operands (fn)->operand_memory_index]); | |
276 gimple_ssa_operands (fn)->operand_memory_index += size; | |
0 | 277 return ptr; |
278 } | |
279 | |
280 | |
281 /* Allocate a USE operand. */ | |
282 | |
283 static inline struct use_optype_d * | |
111 | 284 alloc_use (struct function *fn) |
0 | 285 { |
286 struct use_optype_d *ret; | |
111 | 287 if (gimple_ssa_operands (fn)->free_uses) |
0 | 288 { |
111 | 289 ret = gimple_ssa_operands (fn)->free_uses; |
290 gimple_ssa_operands (fn)->free_uses | |
291 = gimple_ssa_operands (fn)->free_uses->next; | |
0 | 292 } |
293 else | |
294 ret = (struct use_optype_d *) | |
111 | 295 ssa_operand_alloc (fn, sizeof (struct use_optype_d)); |
0 | 296 return ret; |
297 } | |
298 | |
299 | |
300 /* Adds OP to the list of uses of statement STMT after LAST. */ | |
301 | |
302 static inline use_optype_p | |
111 | 303 add_use_op (struct function *fn, gimple *stmt, tree *op, use_optype_p last) |
0 | 304 { |
305 use_optype_p new_use; | |
306 | |
111 | 307 new_use = alloc_use (fn); |
0 | 308 USE_OP_PTR (new_use)->use = op; |
309 link_imm_use_stmt (USE_OP_PTR (new_use), *op, stmt); | |
310 last->next = new_use; | |
311 new_use->next = NULL; | |
312 return new_use; | |
313 } | |
314 | |
315 | |
316 | |
317 /* Takes elements from build_defs and turns them into def operands of STMT. | |
111 | 318 TODO -- Make build_defs vec of tree *. */ |
0 | 319 |
320 static inline void | |
111 | 321 finalize_ssa_defs (struct function *fn, gimple *stmt) |
0 | 322 { |
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323 /* Pre-pend the vdef we may have built. */ |
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324 if (build_vdef != NULL_TREE) |
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325 { |
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326 tree oldvdef = gimple_vdef (stmt); |
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327 if (oldvdef |
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328 && TREE_CODE (oldvdef) == SSA_NAME) |
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329 oldvdef = SSA_NAME_VAR (oldvdef); |
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330 if (oldvdef != build_vdef) |
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331 gimple_set_vdef (stmt, build_vdef); |
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332 } |
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333 |
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334 /* Clear and unlink a no longer necessary VDEF. */ |
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335 if (build_vdef == NULL_TREE |
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336 && gimple_vdef (stmt) != NULL_TREE) |
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337 { |
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338 if (TREE_CODE (gimple_vdef (stmt)) == SSA_NAME) |
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339 { |
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340 unlink_stmt_vdef (stmt); |
111 | 341 release_ssa_name_fn (fn, gimple_vdef (stmt)); |
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342 } |
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343 gimple_set_vdef (stmt, NULL_TREE); |
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344 } |
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345 |
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346 /* If we have a non-SSA_NAME VDEF, mark it for renaming. */ |
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347 if (gimple_vdef (stmt) |
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348 && TREE_CODE (gimple_vdef (stmt)) != SSA_NAME) |
0 | 349 { |
111 | 350 fn->gimple_df->rename_vops = 1; |
351 fn->gimple_df->ssa_renaming_needed = 1; | |
0 | 352 } |
353 } | |
354 | |
355 | |
111 | 356 /* Takes elements from build_uses and turns them into use operands of STMT. */ |
0 | 357 |
358 static inline void | |
111 | 359 finalize_ssa_uses (struct function *fn, gimple *stmt) |
0 | 360 { |
361 unsigned new_i; | |
362 struct use_optype_d new_list; | |
363 use_optype_p old_ops, ptr, last; | |
364 | |
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365 /* Pre-pend the VUSE we may have built. */ |
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366 if (build_vuse != NULL_TREE) |
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367 { |
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368 tree oldvuse = gimple_vuse (stmt); |
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369 if (oldvuse |
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370 && TREE_CODE (oldvuse) == SSA_NAME) |
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371 oldvuse = SSA_NAME_VAR (oldvuse); |
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372 if (oldvuse != (build_vuse != NULL_TREE |
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373 ? build_vuse : build_vdef)) |
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374 gimple_set_vuse (stmt, NULL_TREE); |
111 | 375 build_uses.safe_insert (0, gimple_vuse_ptr (stmt)); |
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376 } |
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377 |
0 | 378 new_list.next = NULL; |
379 last = &new_list; | |
380 | |
381 old_ops = gimple_use_ops (stmt); | |
382 | |
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383 /* Clear a no longer necessary VUSE. */ |
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384 if (build_vuse == NULL_TREE |
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385 && gimple_vuse (stmt) != NULL_TREE) |
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386 gimple_set_vuse (stmt, NULL_TREE); |
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387 |
0 | 388 /* If there is anything in the old list, free it. */ |
389 if (old_ops) | |
390 { | |
111 | 391 for (ptr = old_ops; ptr->next; ptr = ptr->next) |
0 | 392 delink_imm_use (USE_OP_PTR (ptr)); |
111 | 393 delink_imm_use (USE_OP_PTR (ptr)); |
394 ptr->next = gimple_ssa_operands (fn)->free_uses; | |
395 gimple_ssa_operands (fn)->free_uses = old_ops; | |
0 | 396 } |
397 | |
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398 /* If we added a VUSE, make sure to set the operand if it is not already |
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399 present and mark it for renaming. */ |
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400 if (build_vuse != NULL_TREE |
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401 && gimple_vuse (stmt) == NULL_TREE) |
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402 { |
111 | 403 gimple_set_vuse (stmt, gimple_vop (fn)); |
404 fn->gimple_df->rename_vops = 1; | |
405 fn->gimple_df->ssa_renaming_needed = 1; | |
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406 } |
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407 |
0 | 408 /* Now create nodes for all the new nodes. */ |
111 | 409 for (new_i = 0; new_i < build_uses.length (); new_i++) |
410 { | |
411 tree *op = build_uses[new_i]; | |
412 last = add_use_op (fn, stmt, op, last); | |
413 } | |
0 | 414 |
415 /* Now set the stmt's operands. */ | |
416 gimple_set_use_ops (stmt, new_list.next); | |
417 } | |
418 | |
419 | |
420 /* Clear the in_list bits and empty the build array for VDEFs and | |
421 VUSEs. */ | |
422 | |
423 static inline void | |
424 cleanup_build_arrays (void) | |
425 { | |
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426 build_vdef = NULL_TREE; |
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427 build_vuse = NULL_TREE; |
111 | 428 build_uses.truncate (0); |
0 | 429 } |
430 | |
431 | |
432 /* Finalize all the build vectors, fill the new ones into INFO. */ | |
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433 |
0 | 434 static inline void |
111 | 435 finalize_ssa_stmt_operands (struct function *fn, gimple *stmt) |
0 | 436 { |
111 | 437 finalize_ssa_defs (fn, stmt); |
438 finalize_ssa_uses (fn, stmt); | |
0 | 439 cleanup_build_arrays (); |
440 } | |
441 | |
442 | |
443 /* Start the process of building up operands vectors in INFO. */ | |
444 | |
445 static inline void | |
446 start_ssa_stmt_operands (void) | |
447 { | |
111 | 448 gcc_assert (build_uses.length () == 0); |
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449 gcc_assert (build_vuse == NULL_TREE); |
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450 gcc_assert (build_vdef == NULL_TREE); |
0 | 451 } |
452 | |
453 | |
454 /* Add USE_P to the list of pointers to operands. */ | |
455 | |
456 static inline void | |
457 append_use (tree *use_p) | |
458 { | |
111 | 459 build_uses.safe_push (use_p); |
0 | 460 } |
461 | |
462 | |
463 /* Add VAR to the set of variables that require a VDEF operator. */ | |
464 | |
465 static inline void | |
466 append_vdef (tree var) | |
467 { | |
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468 gcc_assert ((build_vdef == NULL_TREE |
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469 || build_vdef == var) |
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470 && (build_vuse == NULL_TREE |
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471 || build_vuse == var)); |
0 | 472 |
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473 build_vdef = var; |
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474 build_vuse = var; |
0 | 475 } |
476 | |
477 | |
478 /* Add VAR to the set of variables that require a VUSE operator. */ | |
479 | |
480 static inline void | |
481 append_vuse (tree var) | |
482 { | |
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483 gcc_assert (build_vuse == NULL_TREE |
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484 || build_vuse == var); |
0 | 485 |
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486 build_vuse = var; |
0 | 487 } |
488 | |
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489 /* Add virtual operands for STMT. FLAGS is as in get_expr_operands. */ |
0 | 490 |
491 static void | |
111 | 492 add_virtual_operand (struct function *fn, |
493 gimple *stmt ATTRIBUTE_UNUSED, int flags) | |
0 | 494 { |
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495 /* Add virtual operands to the stmt, unless the caller has specifically |
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496 requested not to do that (used when adding operands inside an |
0 | 497 ADDR_EXPR expression). */ |
498 if (flags & opf_no_vops) | |
499 return; | |
500 | |
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501 gcc_assert (!is_gimple_debug (stmt)); |
0 | 502 |
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503 if (flags & opf_def) |
111 | 504 append_vdef (gimple_vop (fn)); |
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505 else |
111 | 506 append_vuse (gimple_vop (fn)); |
0 | 507 } |
508 | |
509 | |
510 /* Add *VAR_P to the appropriate operand array for statement STMT. | |
511 FLAGS is as in get_expr_operands. If *VAR_P is a GIMPLE register, | |
512 it will be added to the statement's real operands, otherwise it is | |
513 added to virtual operands. */ | |
514 | |
515 static void | |
111 | 516 add_stmt_operand (struct function *fn, tree *var_p, gimple *stmt, int flags) |
0 | 517 { |
111 | 518 tree var = *var_p; |
0 | 519 |
131 | 520 gcc_assert (SSA_VAR_P (*var_p) || TREE_CODE (*var_p) == STRING_CST); |
0 | 521 |
111 | 522 if (is_gimple_reg (var)) |
0 | 523 { |
524 /* The variable is a GIMPLE register. Add it to real operands. */ | |
525 if (flags & opf_def) | |
111 | 526 ; |
0 | 527 else |
528 append_use (var_p); | |
111 | 529 if (DECL_P (*var_p)) |
530 fn->gimple_df->ssa_renaming_needed = 1; | |
0 | 531 } |
532 else | |
111 | 533 { |
534 /* Mark statements with volatile operands. */ | |
535 if (!(flags & opf_no_vops) | |
536 && TREE_THIS_VOLATILE (var)) | |
537 gimple_set_has_volatile_ops (stmt, true); | |
538 | |
539 /* The variable is a memory access. Add virtual operands. */ | |
540 add_virtual_operand (fn, stmt, flags); | |
541 } | |
0 | 542 } |
543 | |
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544 /* Mark the base address of REF as having its address taken. |
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545 REF may be a single variable whose address has been taken or any |
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546 other valid GIMPLE memory reference (structure reference, array, |
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547 etc). */ |
0 | 548 |
549 static void | |
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550 mark_address_taken (tree ref) |
0 | 551 { |
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552 tree var; |
0 | 553 |
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554 /* Note that it is *NOT OKAY* to use the target of a COMPONENT_REF |
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555 as the only thing we take the address of. If VAR is a structure, |
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556 taking the address of a field means that the whole structure may |
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557 be referenced using pointer arithmetic. See PR 21407 and the |
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558 ensuing mailing list discussion. */ |
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559 var = get_base_address (ref); |
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560 if (var) |
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561 { |
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562 if (DECL_P (var)) |
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563 TREE_ADDRESSABLE (var) = 1; |
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564 else if (TREE_CODE (var) == MEM_REF |
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565 && TREE_CODE (TREE_OPERAND (var, 0)) == ADDR_EXPR |
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566 && DECL_P (TREE_OPERAND (TREE_OPERAND (var, 0), 0))) |
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567 TREE_ADDRESSABLE (TREE_OPERAND (TREE_OPERAND (var, 0), 0)) = 1; |
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568 } |
0 | 569 } |
570 | |
571 | |
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572 /* A subroutine of get_expr_operands to handle MEM_REF. |
0 | 573 |
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574 STMT is the statement being processed, EXPR is the MEM_REF |
0 | 575 that got us here. |
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576 |
111 | 577 FLAGS is as in get_expr_operands. */ |
0 | 578 |
579 static void | |
111 | 580 get_mem_ref_operands (struct function *fn, |
581 gimple *stmt, tree expr, int flags) | |
0 | 582 { |
583 tree *pptr = &TREE_OPERAND (expr, 0); | |
584 | |
111 | 585 if (!(flags & opf_no_vops) |
586 && TREE_THIS_VOLATILE (expr)) | |
0 | 587 gimple_set_has_volatile_ops (stmt, true); |
588 | |
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589 /* Add the VOP. */ |
111 | 590 add_virtual_operand (fn, stmt, flags); |
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591 |
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592 /* If requested, add a USE operand for the base pointer. */ |
111 | 593 get_expr_operands (fn, stmt, pptr, |
594 opf_non_addressable | opf_use | |
595 | (flags & (opf_no_vops|opf_not_non_addressable))); | |
0 | 596 } |
597 | |
598 | |
599 /* A subroutine of get_expr_operands to handle TARGET_MEM_REF. */ | |
600 | |
601 static void | |
111 | 602 get_tmr_operands (struct function *fn, gimple *stmt, tree expr, int flags) |
0 | 603 { |
111 | 604 if (!(flags & opf_no_vops) |
605 && TREE_THIS_VOLATILE (expr)) | |
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606 gimple_set_has_volatile_ops (stmt, true); |
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607 |
0 | 608 /* First record the real operands. */ |
111 | 609 get_expr_operands (fn, stmt, |
610 &TMR_BASE (expr), opf_use | (flags & opf_no_vops)); | |
611 get_expr_operands (fn, stmt, | |
612 &TMR_INDEX (expr), opf_use | (flags & opf_no_vops)); | |
613 get_expr_operands (fn, stmt, | |
614 &TMR_INDEX2 (expr), opf_use | (flags & opf_no_vops)); | |
0 | 615 |
111 | 616 add_virtual_operand (fn, stmt, flags); |
0 | 617 } |
618 | |
619 | |
620 /* If STMT is a call that may clobber globals and other symbols that | |
621 escape, add them to the VDEF/VUSE lists for it. */ | |
622 | |
623 static void | |
111 | 624 maybe_add_call_vops (struct function *fn, gcall *stmt) |
0 | 625 { |
626 int call_flags = gimple_call_flags (stmt); | |
627 | |
628 /* If aliases have been computed already, add VDEF or VUSE | |
629 operands for all the symbols that have been found to be | |
630 call-clobbered. */ | |
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631 if (!(call_flags & ECF_NOVOPS)) |
0 | 632 { |
111 | 633 /* A 'pure' or a 'const' function never call-clobbers anything. */ |
634 if (!(call_flags & (ECF_PURE | ECF_CONST))) | |
635 add_virtual_operand (fn, stmt, opf_def); | |
0 | 636 else if (!(call_flags & ECF_CONST)) |
111 | 637 add_virtual_operand (fn, stmt, opf_use); |
0 | 638 } |
639 } | |
640 | |
641 | |
642 /* Scan operands in the ASM_EXPR stmt referred to in INFO. */ | |
643 | |
644 static void | |
111 | 645 get_asm_stmt_operands (struct function *fn, gasm *stmt) |
0 | 646 { |
647 size_t i, noutputs; | |
648 const char **oconstraints; | |
649 const char *constraint; | |
650 bool allows_mem, allows_reg, is_inout; | |
651 | |
652 noutputs = gimple_asm_noutputs (stmt); | |
653 oconstraints = (const char **) alloca ((noutputs) * sizeof (const char *)); | |
654 | |
655 /* Gather all output operands. */ | |
656 for (i = 0; i < gimple_asm_noutputs (stmt); i++) | |
657 { | |
658 tree link = gimple_asm_output_op (stmt, i); | |
659 constraint = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link))); | |
660 oconstraints[i] = constraint; | |
661 parse_output_constraint (&constraint, i, 0, 0, &allows_mem, | |
662 &allows_reg, &is_inout); | |
663 | |
664 /* This should have been split in gimplify_asm_expr. */ | |
665 gcc_assert (!allows_reg || !is_inout); | |
666 | |
667 /* Memory operands are addressable. Note that STMT needs the | |
668 address of this operand. */ | |
669 if (!allows_reg && allows_mem) | |
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670 mark_address_taken (TREE_VALUE (link)); |
0 | 671 |
111 | 672 get_expr_operands (fn, stmt, |
673 &TREE_VALUE (link), opf_def | opf_not_non_addressable); | |
0 | 674 } |
675 | |
676 /* Gather all input operands. */ | |
677 for (i = 0; i < gimple_asm_ninputs (stmt); i++) | |
678 { | |
679 tree link = gimple_asm_input_op (stmt, i); | |
680 constraint = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link))); | |
681 parse_input_constraint (&constraint, 0, 0, noutputs, 0, oconstraints, | |
682 &allows_mem, &allows_reg); | |
683 | |
684 /* Memory operands are addressable. Note that STMT needs the | |
685 address of this operand. */ | |
686 if (!allows_reg && allows_mem) | |
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687 mark_address_taken (TREE_VALUE (link)); |
0 | 688 |
111 | 689 get_expr_operands (fn, stmt, &TREE_VALUE (link), opf_not_non_addressable); |
0 | 690 } |
691 | |
692 /* Clobber all memory and addressable symbols for asm ("" : : : "memory"); */ | |
111 | 693 if (gimple_asm_clobbers_memory_p (stmt)) |
694 add_virtual_operand (fn, stmt, opf_def); | |
0 | 695 } |
696 | |
697 | |
698 /* Recursively scan the expression pointed to by EXPR_P in statement | |
699 STMT. FLAGS is one of the OPF_* constants modifying how to | |
700 interpret the operands found. */ | |
701 | |
702 static void | |
111 | 703 get_expr_operands (struct function *fn, gimple *stmt, tree *expr_p, int flags) |
0 | 704 { |
705 enum tree_code code; | |
706 enum tree_code_class codeclass; | |
707 tree expr = *expr_p; | |
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708 int uflags = opf_use; |
0 | 709 |
710 if (expr == NULL) | |
711 return; | |
712 | |
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713 if (is_gimple_debug (stmt)) |
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714 uflags |= (flags & opf_no_vops); |
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715 |
0 | 716 code = TREE_CODE (expr); |
717 codeclass = TREE_CODE_CLASS (code); | |
718 | |
719 switch (code) | |
720 { | |
721 case ADDR_EXPR: | |
722 /* Taking the address of a variable does not represent a | |
723 reference to it, but the fact that the statement takes its | |
724 address will be of interest to some passes (e.g. alias | |
725 resolution). */ | |
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726 if ((!(flags & opf_non_addressable) |
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727 || (flags & opf_not_non_addressable)) |
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728 && !is_gimple_debug (stmt)) |
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729 mark_address_taken (TREE_OPERAND (expr, 0)); |
0 | 730 |
731 /* Otherwise, there may be variables referenced inside but there | |
732 should be no VUSEs created, since the referenced objects are | |
733 not really accessed. The only operands that we should find | |
734 here are ARRAY_REF indices which will always be real operands | |
735 (GIMPLE does not allow non-registers as array indices). */ | |
736 flags |= opf_no_vops; | |
111 | 737 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 0), |
738 flags | opf_not_non_addressable | opf_address_taken); | |
0 | 739 return; |
740 | |
741 case SSA_NAME: | |
742 case VAR_DECL: | |
743 case PARM_DECL: | |
744 case RESULT_DECL: | |
131 | 745 case STRING_CST: |
111 | 746 if (!(flags & opf_address_taken)) |
747 add_stmt_operand (fn, expr_p, stmt, flags); | |
0 | 748 return; |
749 | |
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750 case DEBUG_EXPR_DECL: |
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751 gcc_assert (gimple_debug_bind_p (stmt)); |
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752 return; |
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753 |
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754 case MEM_REF: |
111 | 755 get_mem_ref_operands (fn, stmt, expr, flags); |
0 | 756 return; |
757 | |
758 case TARGET_MEM_REF: | |
111 | 759 get_tmr_operands (fn, stmt, expr, flags); |
0 | 760 return; |
761 | |
762 case ARRAY_REF: | |
763 case ARRAY_RANGE_REF: | |
764 case COMPONENT_REF: | |
765 case REALPART_EXPR: | |
766 case IMAGPART_EXPR: | |
767 { | |
111 | 768 if (!(flags & opf_no_vops) |
769 && TREE_THIS_VOLATILE (expr)) | |
0 | 770 gimple_set_has_volatile_ops (stmt, true); |
771 | |
111 | 772 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 0), flags); |
0 | 773 |
774 if (code == COMPONENT_REF) | |
775 { | |
111 | 776 if (!(flags & opf_no_vops) |
777 && TREE_THIS_VOLATILE (TREE_OPERAND (expr, 1))) | |
0 | 778 gimple_set_has_volatile_ops (stmt, true); |
111 | 779 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 2), uflags); |
0 | 780 } |
781 else if (code == ARRAY_REF || code == ARRAY_RANGE_REF) | |
782 { | |
111 | 783 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 1), uflags); |
784 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 2), uflags); | |
785 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 3), uflags); | |
0 | 786 } |
787 | |
788 return; | |
789 } | |
790 | |
791 case WITH_SIZE_EXPR: | |
792 /* WITH_SIZE_EXPR is a pass-through reference to its first argument, | |
793 and an rvalue reference to its second argument. */ | |
111 | 794 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 1), uflags); |
795 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 0), flags); | |
0 | 796 return; |
797 | |
798 case COND_EXPR: | |
799 case VEC_COND_EXPR: | |
111 | 800 case VEC_PERM_EXPR: |
801 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 0), uflags); | |
802 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 1), uflags); | |
803 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 2), uflags); | |
0 | 804 return; |
805 | |
806 case CONSTRUCTOR: | |
807 { | |
808 /* General aggregate CONSTRUCTORs have been decomposed, but they | |
809 are still in use as the COMPLEX_EXPR equivalent for vectors. */ | |
810 constructor_elt *ce; | |
811 unsigned HOST_WIDE_INT idx; | |
812 | |
111 | 813 /* A volatile constructor is actually TREE_CLOBBER_P, transfer |
814 the volatility to the statement, don't use TREE_CLOBBER_P for | |
815 mirroring the other uses of THIS_VOLATILE in this file. */ | |
816 if (!(flags & opf_no_vops) | |
817 && TREE_THIS_VOLATILE (expr)) | |
818 gimple_set_has_volatile_ops (stmt, true); | |
819 | |
0 | 820 for (idx = 0; |
111 | 821 vec_safe_iterate (CONSTRUCTOR_ELTS (expr), idx, &ce); |
0 | 822 idx++) |
111 | 823 get_expr_operands (fn, stmt, &ce->value, uflags); |
0 | 824 |
825 return; | |
826 } | |
827 | |
828 case BIT_FIELD_REF: | |
111 | 829 if (!(flags & opf_no_vops) |
830 && TREE_THIS_VOLATILE (expr)) | |
0 | 831 gimple_set_has_volatile_ops (stmt, true); |
832 /* FALLTHRU */ | |
833 | |
834 case VIEW_CONVERT_EXPR: | |
835 do_unary: | |
111 | 836 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 0), flags); |
0 | 837 return; |
838 | |
111 | 839 case BIT_INSERT_EXPR: |
0 | 840 case COMPOUND_EXPR: |
841 case OBJ_TYPE_REF: | |
842 case ASSERT_EXPR: | |
843 do_binary: | |
844 { | |
111 | 845 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 0), flags); |
846 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 1), flags); | |
0 | 847 return; |
848 } | |
849 | |
850 case DOT_PROD_EXPR: | |
111 | 851 case SAD_EXPR: |
0 | 852 case REALIGN_LOAD_EXPR: |
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853 case WIDEN_MULT_PLUS_EXPR: |
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854 case WIDEN_MULT_MINUS_EXPR: |
0 | 855 { |
111 | 856 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 0), flags); |
857 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 1), flags); | |
858 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 2), flags); | |
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859 return; |
0 | 860 } |
861 | |
862 case FUNCTION_DECL: | |
863 case LABEL_DECL: | |
864 case CONST_DECL: | |
865 case CASE_LABEL_EXPR: | |
866 /* Expressions that make no memory references. */ | |
867 return; | |
868 | |
869 default: | |
870 if (codeclass == tcc_unary) | |
871 goto do_unary; | |
872 if (codeclass == tcc_binary || codeclass == tcc_comparison) | |
873 goto do_binary; | |
874 if (codeclass == tcc_constant || codeclass == tcc_type) | |
875 return; | |
876 } | |
877 | |
878 /* If we get here, something has gone wrong. */ | |
111 | 879 if (flag_checking) |
880 { | |
881 fprintf (stderr, "unhandled expression in get_expr_operands():\n"); | |
882 debug_tree (expr); | |
883 fputs ("\n", stderr); | |
884 gcc_unreachable (); | |
885 } | |
0 | 886 } |
887 | |
888 | |
889 /* Parse STMT looking for operands. When finished, the various | |
890 build_* operand vectors will have potential operands in them. */ | |
891 | |
892 static void | |
111 | 893 parse_ssa_operands (struct function *fn, gimple *stmt) |
0 | 894 { |
895 enum gimple_code code = gimple_code (stmt); | |
111 | 896 size_t i, n, start = 0; |
0 | 897 |
111 | 898 switch (code) |
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899 { |
111 | 900 case GIMPLE_ASM: |
901 get_asm_stmt_operands (fn, as_a <gasm *> (stmt)); | |
902 break; | |
903 | |
904 case GIMPLE_TRANSACTION: | |
905 /* The start of a transaction is a memory barrier. */ | |
906 add_virtual_operand (fn, stmt, opf_def | opf_use); | |
907 break; | |
908 | |
909 case GIMPLE_DEBUG: | |
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910 if (gimple_debug_bind_p (stmt) |
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911 && gimple_debug_bind_has_value_p (stmt)) |
111 | 912 get_expr_operands (fn, stmt, gimple_debug_bind_get_value_ptr (stmt), |
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913 opf_use | opf_no_vops); |
111 | 914 break; |
915 | |
916 case GIMPLE_RETURN: | |
917 append_vuse (gimple_vop (fn)); | |
918 goto do_default; | |
0 | 919 |
111 | 920 case GIMPLE_CALL: |
921 /* Add call-clobbered operands, if needed. */ | |
922 maybe_add_call_vops (fn, as_a <gcall *> (stmt)); | |
923 /* FALLTHRU */ | |
0 | 924 |
111 | 925 case GIMPLE_ASSIGN: |
926 get_expr_operands (fn, stmt, gimple_op_ptr (stmt, 0), opf_def); | |
927 start = 1; | |
928 /* FALLTHRU */ | |
0 | 929 |
111 | 930 default: |
931 do_default: | |
932 n = gimple_num_ops (stmt); | |
933 for (i = start; i < n; i++) | |
934 get_expr_operands (fn, stmt, gimple_op_ptr (stmt, i), opf_use); | |
935 break; | |
0 | 936 } |
937 } | |
938 | |
939 | |
940 /* Create an operands cache for STMT. */ | |
941 | |
942 static void | |
111 | 943 build_ssa_operands (struct function *fn, gimple *stmt) |
0 | 944 { |
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945 /* Initially assume that the statement has no volatile operands. */ |
0 | 946 gimple_set_has_volatile_ops (stmt, false); |
947 | |
948 start_ssa_stmt_operands (); | |
111 | 949 parse_ssa_operands (fn, stmt); |
950 finalize_ssa_stmt_operands (fn, stmt); | |
951 } | |
952 | |
953 /* Verifies SSA statement operands. */ | |
954 | |
955 DEBUG_FUNCTION bool | |
956 verify_ssa_operands (struct function *fn, gimple *stmt) | |
957 { | |
958 use_operand_p use_p; | |
959 def_operand_p def_p; | |
960 ssa_op_iter iter; | |
961 unsigned i; | |
962 tree def; | |
963 bool volatile_p = gimple_has_volatile_ops (stmt); | |
964 | |
965 /* build_ssa_operands w/o finalizing them. */ | |
966 gimple_set_has_volatile_ops (stmt, false); | |
967 start_ssa_stmt_operands (); | |
968 parse_ssa_operands (fn, stmt); | |
969 | |
970 /* Now verify the built operands are the same as present in STMT. */ | |
971 def = gimple_vdef (stmt); | |
972 if (def | |
973 && TREE_CODE (def) == SSA_NAME) | |
974 def = SSA_NAME_VAR (def); | |
975 if (build_vdef != def) | |
976 { | |
977 error ("virtual definition of statement not up-to-date"); | |
978 return true; | |
979 } | |
980 if (gimple_vdef (stmt) | |
981 && ((def_p = gimple_vdef_op (stmt)) == NULL_DEF_OPERAND_P | |
982 || DEF_FROM_PTR (def_p) != gimple_vdef (stmt))) | |
983 { | |
984 error ("virtual def operand missing for stmt"); | |
985 return true; | |
986 } | |
987 | |
988 tree use = gimple_vuse (stmt); | |
989 if (use | |
990 && TREE_CODE (use) == SSA_NAME) | |
991 use = SSA_NAME_VAR (use); | |
992 if (build_vuse != use) | |
993 { | |
994 error ("virtual use of statement not up-to-date"); | |
995 return true; | |
996 } | |
997 if (gimple_vuse (stmt) | |
998 && ((use_p = gimple_vuse_op (stmt)) == NULL_USE_OPERAND_P | |
999 || USE_FROM_PTR (use_p) != gimple_vuse (stmt))) | |
1000 { | |
1001 error ("virtual use operand missing for stmt"); | |
1002 return true; | |
1003 } | |
1004 | |
1005 FOR_EACH_SSA_USE_OPERAND (use_p, stmt, iter, SSA_OP_USE) | |
1006 { | |
1007 tree *op; | |
1008 FOR_EACH_VEC_ELT (build_uses, i, op) | |
1009 { | |
1010 if (use_p->use == op) | |
1011 { | |
1012 build_uses[i] = NULL; | |
1013 break; | |
1014 } | |
1015 } | |
1016 if (i == build_uses.length ()) | |
1017 { | |
1018 error ("excess use operand for stmt"); | |
1019 debug_generic_expr (USE_FROM_PTR (use_p)); | |
1020 return true; | |
1021 } | |
1022 } | |
1023 | |
1024 tree *op; | |
1025 FOR_EACH_VEC_ELT (build_uses, i, op) | |
1026 if (op != NULL) | |
1027 { | |
1028 error ("use operand missing for stmt"); | |
1029 debug_generic_expr (*op); | |
1030 return true; | |
1031 } | |
1032 | |
1033 if (gimple_has_volatile_ops (stmt) != volatile_p) | |
1034 { | |
1035 error ("stmt volatile flag not up-to-date"); | |
1036 return true; | |
1037 } | |
1038 | |
1039 cleanup_build_arrays (); | |
1040 return false; | |
0 | 1041 } |
1042 | |
1043 | |
1044 /* Releases the operands of STMT back to their freelists, and clears | |
1045 the stmt operand lists. */ | |
1046 | |
1047 void | |
111 | 1048 free_stmt_operands (struct function *fn, gimple *stmt) |
0 | 1049 { |
1050 use_optype_p uses = gimple_use_ops (stmt), last_use; | |
1051 | |
1052 if (uses) | |
1053 { | |
1054 for (last_use = uses; last_use->next; last_use = last_use->next) | |
1055 delink_imm_use (USE_OP_PTR (last_use)); | |
1056 delink_imm_use (USE_OP_PTR (last_use)); | |
111 | 1057 last_use->next = gimple_ssa_operands (fn)->free_uses; |
1058 gimple_ssa_operands (fn)->free_uses = uses; | |
0 | 1059 gimple_set_use_ops (stmt, NULL); |
1060 } | |
1061 | |
1062 if (gimple_has_mem_ops (stmt)) | |
1063 { | |
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1064 gimple_set_vuse (stmt, NULL_TREE); |
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1065 gimple_set_vdef (stmt, NULL_TREE); |
0 | 1066 } |
1067 } | |
1068 | |
1069 | |
1070 /* Get the operands of statement STMT. */ | |
1071 | |
1072 void | |
111 | 1073 update_stmt_operands (struct function *fn, gimple *stmt) |
0 | 1074 { |
1075 /* If update_stmt_operands is called before SSA is initialized, do | |
1076 nothing. */ | |
111 | 1077 if (!ssa_operands_active (fn)) |
0 | 1078 return; |
1079 | |
1080 timevar_push (TV_TREE_OPS); | |
1081 | |
1082 gcc_assert (gimple_modified_p (stmt)); | |
111 | 1083 build_ssa_operands (fn, stmt); |
0 | 1084 gimple_set_modified (stmt, false); |
1085 | |
1086 timevar_pop (TV_TREE_OPS); | |
1087 } | |
1088 | |
1089 | |
1090 /* Swap operands EXP0 and EXP1 in statement STMT. No attempt is done | |
1091 to test the validity of the swap operation. */ | |
1092 | |
1093 void | |
111 | 1094 swap_ssa_operands (gimple *stmt, tree *exp0, tree *exp1) |
0 | 1095 { |
1096 tree op0, op1; | |
1097 op0 = *exp0; | |
1098 op1 = *exp1; | |
1099 | |
111 | 1100 if (op0 != op1) |
0 | 1101 { |
111 | 1102 /* Attempt to preserve the relative positions of these two operands in |
1103 their * respective immediate use lists by adjusting their use pointer | |
1104 to point to the new operand position. */ | |
0 | 1105 use_optype_p use0, use1, ptr; |
1106 use0 = use1 = NULL; | |
1107 | |
1108 /* Find the 2 operands in the cache, if they are there. */ | |
1109 for (ptr = gimple_use_ops (stmt); ptr; ptr = ptr->next) | |
1110 if (USE_OP_PTR (ptr)->use == exp0) | |
1111 { | |
1112 use0 = ptr; | |
1113 break; | |
1114 } | |
1115 | |
1116 for (ptr = gimple_use_ops (stmt); ptr; ptr = ptr->next) | |
1117 if (USE_OP_PTR (ptr)->use == exp1) | |
1118 { | |
1119 use1 = ptr; | |
1120 break; | |
1121 } | |
1122 | |
111 | 1123 /* And adjust their location to point to the new position of the |
1124 operand. */ | |
1125 if (use0) | |
1126 USE_OP_PTR (use0)->use = exp1; | |
1127 if (use1) | |
1128 USE_OP_PTR (use1)->use = exp0; | |
1129 | |
1130 /* Now swap the data. */ | |
1131 *exp0 = op1; | |
1132 *exp1 = op0; | |
0 | 1133 } |
1134 } | |
1135 | |
1136 | |
1137 /* Scan the immediate_use list for VAR making sure its linked properly. | |
1138 Return TRUE if there is a problem and emit an error message to F. */ | |
1139 | |
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1140 DEBUG_FUNCTION bool |
0 | 1141 verify_imm_links (FILE *f, tree var) |
1142 { | |
1143 use_operand_p ptr, prev, list; | |
111 | 1144 unsigned int count; |
0 | 1145 |
1146 gcc_assert (TREE_CODE (var) == SSA_NAME); | |
1147 | |
1148 list = &(SSA_NAME_IMM_USE_NODE (var)); | |
1149 gcc_assert (list->use == NULL); | |
1150 | |
1151 if (list->prev == NULL) | |
1152 { | |
1153 gcc_assert (list->next == NULL); | |
1154 return false; | |
1155 } | |
1156 | |
1157 prev = list; | |
1158 count = 0; | |
1159 for (ptr = list->next; ptr != list; ) | |
1160 { | |
1161 if (prev != ptr->prev) | |
111 | 1162 { |
1163 fprintf (f, "prev != ptr->prev\n"); | |
1164 goto error; | |
1165 } | |
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1166 |
0 | 1167 if (ptr->use == NULL) |
111 | 1168 { |
1169 fprintf (f, "ptr->use == NULL\n"); | |
1170 goto error; /* 2 roots, or SAFE guard node. */ | |
1171 } | |
0 | 1172 else if (*(ptr->use) != var) |
111 | 1173 { |
1174 fprintf (f, "*(ptr->use) != var\n"); | |
1175 goto error; | |
1176 } | |
0 | 1177 |
1178 prev = ptr; | |
1179 ptr = ptr->next; | |
1180 | |
111 | 1181 count++; |
1182 if (count == 0) | |
1183 { | |
1184 fprintf (f, "number of immediate uses doesn't fit unsigned int\n"); | |
1185 goto error; | |
1186 } | |
0 | 1187 } |
1188 | |
1189 /* Verify list in the other direction. */ | |
1190 prev = list; | |
1191 for (ptr = list->prev; ptr != list; ) | |
1192 { | |
1193 if (prev != ptr->next) | |
111 | 1194 { |
1195 fprintf (f, "prev != ptr->next\n"); | |
1196 goto error; | |
1197 } | |
0 | 1198 prev = ptr; |
1199 ptr = ptr->prev; | |
111 | 1200 if (count == 0) |
1201 { | |
1202 fprintf (f, "count-- < 0\n"); | |
1203 goto error; | |
1204 } | |
1205 count--; | |
0 | 1206 } |
1207 | |
1208 if (count != 0) | |
111 | 1209 { |
1210 fprintf (f, "count != 0\n"); | |
1211 goto error; | |
1212 } | |
0 | 1213 |
1214 return false; | |
1215 | |
1216 error: | |
1217 if (ptr->loc.stmt && gimple_modified_p (ptr->loc.stmt)) | |
1218 { | |
1219 fprintf (f, " STMT MODIFIED. - <%p> ", (void *)ptr->loc.stmt); | |
1220 print_gimple_stmt (f, ptr->loc.stmt, 0, TDF_SLIM); | |
1221 } | |
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1222 fprintf (f, " IMM ERROR : (use_p : tree - %p:%p)", (void *)ptr, |
0 | 1223 (void *)ptr->use); |
1224 print_generic_expr (f, USE_FROM_PTR (ptr), TDF_SLIM); | |
111 | 1225 fprintf (f, "\n"); |
0 | 1226 return true; |
1227 } | |
1228 | |
1229 | |
1230 /* Dump all the immediate uses to FILE. */ | |
1231 | |
1232 void | |
1233 dump_immediate_uses_for (FILE *file, tree var) | |
1234 { | |
1235 imm_use_iterator iter; | |
1236 use_operand_p use_p; | |
1237 | |
1238 gcc_assert (var && TREE_CODE (var) == SSA_NAME); | |
1239 | |
1240 print_generic_expr (file, var, TDF_SLIM); | |
1241 fprintf (file, " : -->"); | |
1242 if (has_zero_uses (var)) | |
1243 fprintf (file, " no uses.\n"); | |
1244 else | |
1245 if (has_single_use (var)) | |
1246 fprintf (file, " single use.\n"); | |
1247 else | |
1248 fprintf (file, "%d uses.\n", num_imm_uses (var)); | |
1249 | |
1250 FOR_EACH_IMM_USE_FAST (use_p, iter, var) | |
1251 { | |
1252 if (use_p->loc.stmt == NULL && use_p->use == NULL) | |
1253 fprintf (file, "***end of stmt iterator marker***\n"); | |
1254 else | |
1255 if (!is_gimple_reg (USE_FROM_PTR (use_p))) | |
1256 print_gimple_stmt (file, USE_STMT (use_p), 0, TDF_VOPS|TDF_MEMSYMS); | |
1257 else | |
1258 print_gimple_stmt (file, USE_STMT (use_p), 0, TDF_SLIM); | |
1259 } | |
111 | 1260 fprintf (file, "\n"); |
0 | 1261 } |
1262 | |
1263 | |
1264 /* Dump all the immediate uses to FILE. */ | |
1265 | |
1266 void | |
1267 dump_immediate_uses (FILE *file) | |
1268 { | |
1269 tree var; | |
1270 unsigned int x; | |
1271 | |
1272 fprintf (file, "Immediate_uses: \n\n"); | |
111 | 1273 FOR_EACH_SSA_NAME (x, var, cfun) |
0 | 1274 { |
1275 dump_immediate_uses_for (file, var); | |
1276 } | |
1277 } | |
1278 | |
1279 | |
1280 /* Dump def-use edges on stderr. */ | |
1281 | |
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1282 DEBUG_FUNCTION void |
0 | 1283 debug_immediate_uses (void) |
1284 { | |
1285 dump_immediate_uses (stderr); | |
1286 } | |
1287 | |
1288 | |
1289 /* Dump def-use edges on stderr. */ | |
1290 | |
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1291 DEBUG_FUNCTION void |
0 | 1292 debug_immediate_uses_for (tree var) |
1293 { | |
1294 dump_immediate_uses_for (stderr, var); | |
1295 } | |
1296 | |
1297 | |
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1298 /* Unlink STMTs virtual definition from the IL by propagating its use. */ |
0 | 1299 |
1300 void | |
111 | 1301 unlink_stmt_vdef (gimple *stmt) |
0 | 1302 { |
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1303 use_operand_p use_p; |
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1304 imm_use_iterator iter; |
111 | 1305 gimple *use_stmt; |
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1306 tree vdef = gimple_vdef (stmt); |
111 | 1307 tree vuse = gimple_vuse (stmt); |
0 | 1308 |
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1309 if (!vdef |
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1310 || TREE_CODE (vdef) != SSA_NAME) |
0 | 1311 return; |
1312 | |
111 | 1313 FOR_EACH_IMM_USE_STMT (use_stmt, iter, vdef) |
0 | 1314 { |
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1315 FOR_EACH_IMM_USE_ON_STMT (use_p, iter) |
111 | 1316 SET_USE (use_p, vuse); |
0 | 1317 } |
1318 | |
111 | 1319 if (SSA_NAME_OCCURS_IN_ABNORMAL_PHI (vdef)) |
1320 SSA_NAME_OCCURS_IN_ABNORMAL_PHI (vuse) = 1; | |
0 | 1321 } |
1322 | |
111 | 1323 /* Return true if the var whose chain of uses starts at PTR has a |
1324 single nondebug use. Set USE_P and STMT to that single nondebug | |
1325 use, if so, or to NULL otherwise. */ | |
1326 bool | |
1327 single_imm_use_1 (const ssa_use_operand_t *head, | |
1328 use_operand_p *use_p, gimple **stmt) | |
1329 { | |
1330 ssa_use_operand_t *ptr, *single_use = 0; | |
1331 | |
1332 for (ptr = head->next; ptr != head; ptr = ptr->next) | |
1333 if (USE_STMT(ptr) && !is_gimple_debug (USE_STMT (ptr))) | |
1334 { | |
1335 if (single_use) | |
1336 { | |
1337 single_use = NULL; | |
1338 break; | |
1339 } | |
1340 single_use = ptr; | |
1341 } | |
1342 | |
1343 if (use_p) | |
1344 *use_p = single_use; | |
1345 | |
1346 if (stmt) | |
1347 *stmt = single_use ? single_use->loc.stmt : NULL; | |
1348 | |
1349 return single_use; | |
1350 } | |
1351 |