Mercurial > hg > CbC > CbC_gcc
annotate gcc/tree-ssa-operands.c @ 117:f81c5aa9f14f
fix
| author | mir3636 |
|---|---|
| date | Tue, 28 Nov 2017 21:17:15 +0900 |
| parents | ab0bcb71f44d |
| children | d34655255c78 |
| rev | line source |
|---|---|
| 0 | 1 /* SSA operands management for trees. |
| 111 | 2 Copyright (C) 2003-2017 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 |
| 520 gcc_assert (SSA_VAR_P (*var_p)); | |
| 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: | |
| 111 | 745 if (!(flags & opf_address_taken)) |
| 746 add_stmt_operand (fn, expr_p, stmt, flags); | |
| 0 | 747 return; |
| 748 | |
|
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749 case DEBUG_EXPR_DECL: |
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750 gcc_assert (gimple_debug_bind_p (stmt)); |
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751 return; |
|
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752 |
|
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|
753 case MEM_REF: |
| 111 | 754 get_mem_ref_operands (fn, stmt, expr, flags); |
| 0 | 755 return; |
| 756 | |
| 757 case TARGET_MEM_REF: | |
| 111 | 758 get_tmr_operands (fn, stmt, expr, flags); |
| 0 | 759 return; |
| 760 | |
| 761 case ARRAY_REF: | |
| 762 case ARRAY_RANGE_REF: | |
| 763 case COMPONENT_REF: | |
| 764 case REALPART_EXPR: | |
| 765 case IMAGPART_EXPR: | |
| 766 { | |
| 111 | 767 if (!(flags & opf_no_vops) |
| 768 && TREE_THIS_VOLATILE (expr)) | |
| 0 | 769 gimple_set_has_volatile_ops (stmt, true); |
| 770 | |
| 111 | 771 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 0), flags); |
| 0 | 772 |
| 773 if (code == COMPONENT_REF) | |
| 774 { | |
| 111 | 775 if (!(flags & opf_no_vops) |
| 776 && TREE_THIS_VOLATILE (TREE_OPERAND (expr, 1))) | |
| 0 | 777 gimple_set_has_volatile_ops (stmt, true); |
| 111 | 778 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 2), uflags); |
| 0 | 779 } |
| 780 else if (code == ARRAY_REF || code == ARRAY_RANGE_REF) | |
| 781 { | |
| 111 | 782 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 1), uflags); |
| 783 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 2), uflags); | |
| 784 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 3), uflags); | |
| 0 | 785 } |
| 786 | |
| 787 return; | |
| 788 } | |
| 789 | |
| 790 case WITH_SIZE_EXPR: | |
| 791 /* WITH_SIZE_EXPR is a pass-through reference to its first argument, | |
| 792 and an rvalue reference to its second argument. */ | |
| 111 | 793 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 1), uflags); |
| 794 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 0), flags); | |
| 0 | 795 return; |
| 796 | |
| 797 case COND_EXPR: | |
| 798 case VEC_COND_EXPR: | |
| 111 | 799 case VEC_PERM_EXPR: |
| 800 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 0), uflags); | |
| 801 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 1), uflags); | |
| 802 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 2), uflags); | |
| 0 | 803 return; |
| 804 | |
| 805 case CONSTRUCTOR: | |
| 806 { | |
| 807 /* General aggregate CONSTRUCTORs have been decomposed, but they | |
| 808 are still in use as the COMPLEX_EXPR equivalent for vectors. */ | |
| 809 constructor_elt *ce; | |
| 810 unsigned HOST_WIDE_INT idx; | |
| 811 | |
| 111 | 812 /* A volatile constructor is actually TREE_CLOBBER_P, transfer |
| 813 the volatility to the statement, don't use TREE_CLOBBER_P for | |
| 814 mirroring the other uses of THIS_VOLATILE in this file. */ | |
| 815 if (!(flags & opf_no_vops) | |
| 816 && TREE_THIS_VOLATILE (expr)) | |
| 817 gimple_set_has_volatile_ops (stmt, true); | |
| 818 | |
| 0 | 819 for (idx = 0; |
| 111 | 820 vec_safe_iterate (CONSTRUCTOR_ELTS (expr), idx, &ce); |
| 0 | 821 idx++) |
| 111 | 822 get_expr_operands (fn, stmt, &ce->value, uflags); |
| 0 | 823 |
| 824 return; | |
| 825 } | |
| 826 | |
| 827 case BIT_FIELD_REF: | |
| 111 | 828 if (!(flags & opf_no_vops) |
| 829 && TREE_THIS_VOLATILE (expr)) | |
| 0 | 830 gimple_set_has_volatile_ops (stmt, true); |
| 831 /* FALLTHRU */ | |
| 832 | |
| 833 case VIEW_CONVERT_EXPR: | |
| 834 do_unary: | |
| 111 | 835 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 0), flags); |
| 0 | 836 return; |
| 837 | |
| 111 | 838 case BIT_INSERT_EXPR: |
| 0 | 839 case COMPOUND_EXPR: |
| 840 case OBJ_TYPE_REF: | |
| 841 case ASSERT_EXPR: | |
| 842 do_binary: | |
| 843 { | |
| 111 | 844 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 0), flags); |
| 845 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 1), flags); | |
| 0 | 846 return; |
| 847 } | |
| 848 | |
| 849 case DOT_PROD_EXPR: | |
| 111 | 850 case SAD_EXPR: |
| 0 | 851 case REALIGN_LOAD_EXPR: |
|
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852 case WIDEN_MULT_PLUS_EXPR: |
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853 case WIDEN_MULT_MINUS_EXPR: |
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854 case FMA_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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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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changeset
|
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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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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diff
changeset
|
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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parents:
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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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parents:
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1303 use_operand_p use_p; |
|
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parents:
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1304 imm_use_iterator iter; |
| 111 | 1305 gimple *use_stmt; |
|
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parents:
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1306 tree vdef = gimple_vdef (stmt); |
| 111 | 1307 tree vuse = gimple_vuse (stmt); |
| 0 | 1308 |
|
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parents:
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1309 if (!vdef |
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parents:
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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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parents:
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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 |