Mercurial > hg > CbC > CbC_gcc
annotate gcc/tree-ssa-operands.c @ 158:494b0b89df80 default tip
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| author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
|---|---|
| date | Mon, 25 May 2020 18:13:55 +0900 |
| parents | 351920fa3827 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* SSA operands management for trees. |
| 145 | 2 Copyright (C) 2003-2020 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" | |
| 33 | |
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34 /* This file contains the code required to manage the operands cache of the |
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35 SSA optimizer. For every stmt, we maintain an operand cache in the stmt |
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36 annotation. This cache contains operands that will be of interest to |
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37 optimizers and other passes wishing to manipulate the IL. |
| 0 | 38 |
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39 The operand type are broken up into REAL and VIRTUAL operands. The real |
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40 operands are represented as pointers into the stmt's operand tree. Thus |
| 0 | 41 any manipulation of the real operands will be reflected in the actual tree. |
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42 Virtual operands are represented solely in the cache, although the base |
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43 variable for the SSA_NAME may, or may not occur in the stmt's tree. |
| 0 | 44 Manipulation of the virtual operands will not be reflected in the stmt tree. |
| 45 | |
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46 The routines in this file are concerned with creating this operand cache |
| 0 | 47 from a stmt tree. |
| 48 | |
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49 The operand tree is the parsed by the various get_* routines which look |
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50 through the stmt tree for the occurrence of operands which may be of |
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51 interest, and calls are made to the append_* routines whenever one is |
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52 found. There are 4 of these routines, each representing one of the |
| 0 | 53 4 types of operands. Defs, Uses, Virtual Uses, and Virtual May Defs. |
| 54 | |
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55 The append_* routines check for duplication, and simply keep a list of |
| 0 | 56 unique objects for each operand type in the build_* extendable vectors. |
| 57 | |
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58 Once the stmt tree is completely parsed, the finalize_ssa_operands() |
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59 routine is called, which proceeds to perform the finalization routine |
| 0 | 60 on each of the 4 operand vectors which have been built up. |
| 61 | |
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62 If the stmt had a previous operand cache, the finalization routines |
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63 attempt to match up the new operands with the old ones. If it's a perfect |
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64 match, the old vector is simply reused. If it isn't a perfect match, then |
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65 a new vector is created and the new operands are placed there. For |
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66 virtual operands, if the previous cache had SSA_NAME version of a |
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67 variable, and that same variable occurs in the same operands cache, then |
| 0 | 68 the new cache vector will also get the same SSA_NAME. |
| 69 | |
| 70 i.e., if a stmt had a VUSE of 'a_5', and 'a' occurs in the new | |
| 71 operand vector for VUSE, then the new vector will also be modified | |
| 72 such that it contains 'a_5' rather than 'a'. */ | |
| 73 | |
| 74 | |
| 75 /* Flags to describe operand properties in helpers. */ | |
| 76 | |
| 77 /* By default, operands are loaded. */ | |
| 78 #define opf_use 0 | |
| 79 | |
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80 /* Operand is the target of an assignment expression or a |
| 0 | 81 call-clobbered variable. */ |
| 82 #define opf_def (1 << 0) | |
| 83 | |
| 84 /* No virtual operands should be created in the expression. This is used | |
| 85 when traversing ADDR_EXPR nodes which have different semantics than | |
| 86 other expressions. Inside an ADDR_EXPR node, the only operands that we | |
| 87 need to consider are indices into arrays. For instance, &a.b[i] should | |
| 88 generate a USE of 'i' but it should not generate a VUSE for 'a' nor a | |
| 89 VUSE for 'b'. */ | |
| 90 #define opf_no_vops (1 << 1) | |
| 91 | |
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92 /* Operand is in a place where address-taken does not imply addressable. */ |
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93 #define opf_non_addressable (1 << 3) |
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94 |
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95 /* Operand is in a place where opf_non_addressable does not apply. */ |
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96 #define opf_not_non_addressable (1 << 4) |
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97 |
| 111 | 98 /* Operand is having its address taken. */ |
| 99 #define opf_address_taken (1 << 5) | |
| 0 | 100 |
| 101 /* Array for building all the use operands. */ | |
| 111 | 102 static vec<tree *> build_uses; |
| 0 | 103 |
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104 /* The built VDEF operand. */ |
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105 static tree build_vdef; |
| 0 | 106 |
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107 /* The built VUSE operand. */ |
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108 static tree build_vuse; |
| 0 | 109 |
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110 /* Bitmap obstack for our datastructures that needs to survive across |
| 0 | 111 compilations of multiple functions. */ |
| 112 static bitmap_obstack operands_bitmap_obstack; | |
| 113 | |
| 111 | 114 static void get_expr_operands (struct function *, gimple *, tree *, int); |
| 0 | 115 |
| 116 /* Number of functions with initialized ssa_operands. */ | |
| 117 static int n_initialized = 0; | |
| 118 | |
| 111 | 119 /* Accessor to tree-ssa-operands.c caches. */ |
| 120 static inline struct ssa_operands * | |
| 121 gimple_ssa_operands (const struct function *fun) | |
| 0 | 122 { |
| 111 | 123 return &fun->gimple_df->ssa_operands; |
| 0 | 124 } |
| 125 | |
| 126 | |
| 127 /* Return true if the SSA operands cache is active. */ | |
| 128 | |
| 129 bool | |
| 111 | 130 ssa_operands_active (struct function *fun) |
| 0 | 131 { |
| 111 | 132 if (fun == NULL) |
| 0 | 133 return false; |
| 134 | |
| 111 | 135 return fun->gimple_df && gimple_ssa_operands (fun)->ops_active; |
| 0 | 136 } |
| 137 | |
| 138 | |
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139 /* Create the VOP variable, an artificial global variable to act as a |
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140 representative of all of the virtual operands FUD chain. */ |
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141 |
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142 static void |
| 111 | 143 create_vop_var (struct function *fn) |
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144 { |
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145 tree global_var; |
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146 |
| 111 | 147 gcc_assert (fn->gimple_df->vop == NULL_TREE); |
| 0 | 148 |
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149 global_var = build_decl (BUILTINS_LOCATION, VAR_DECL, |
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150 get_identifier (".MEM"), |
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151 void_type_node); |
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152 DECL_ARTIFICIAL (global_var) = 1; |
| 111 | 153 DECL_IGNORED_P (global_var) = 1; |
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154 TREE_READONLY (global_var) = 0; |
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155 DECL_EXTERNAL (global_var) = 1; |
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156 TREE_STATIC (global_var) = 1; |
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157 TREE_USED (global_var) = 1; |
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158 DECL_CONTEXT (global_var) = NULL_TREE; |
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159 TREE_THIS_VOLATILE (global_var) = 0; |
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160 TREE_ADDRESSABLE (global_var) = 0; |
| 111 | 161 VAR_DECL_IS_VIRTUAL_OPERAND (global_var) = 1; |
| 0 | 162 |
| 111 | 163 fn->gimple_df->vop = global_var; |
| 0 | 164 } |
| 165 | |
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166 /* These are the sizes of the operand memory buffer in bytes which gets |
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167 allocated each time more operands space is required. The final value is |
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168 the amount that is allocated every time after that. |
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169 In 1k we can fit 25 use operands (or 63 def operands) on a host with |
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170 8 byte pointers, that would be 10 statements each with 1 def and 2 |
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171 uses. */ |
| 0 | 172 |
| 173 #define OP_SIZE_INIT 0 | |
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174 #define OP_SIZE_1 (1024 - sizeof (void *)) |
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175 #define OP_SIZE_2 (1024 * 4 - sizeof (void *)) |
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176 #define OP_SIZE_3 (1024 * 16 - sizeof (void *)) |
| 0 | 177 |
| 178 /* Initialize the operand cache routines. */ | |
| 179 | |
| 180 void | |
| 111 | 181 init_ssa_operands (struct function *fn) |
| 0 | 182 { |
| 183 if (!n_initialized++) | |
| 184 { | |
| 111 | 185 build_uses.create (10); |
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186 build_vuse = NULL_TREE; |
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187 build_vdef = NULL_TREE; |
| 0 | 188 bitmap_obstack_initialize (&operands_bitmap_obstack); |
| 189 } | |
| 190 | |
| 111 | 191 gcc_assert (gimple_ssa_operands (fn)->operand_memory == NULL); |
| 192 gimple_ssa_operands (fn)->operand_memory_index | |
| 193 = gimple_ssa_operands (fn)->ssa_operand_mem_size; | |
| 194 gimple_ssa_operands (fn)->ops_active = true; | |
| 195 gimple_ssa_operands (fn)->ssa_operand_mem_size = OP_SIZE_INIT; | |
| 196 create_vop_var (fn); | |
| 0 | 197 } |
| 198 | |
| 199 | |
| 200 /* Dispose of anything required by the operand routines. */ | |
| 201 | |
| 202 void | |
| 111 | 203 fini_ssa_operands (struct function *fn) |
| 0 | 204 { |
| 205 struct ssa_operand_memory_d *ptr; | |
| 206 | |
| 207 if (!--n_initialized) | |
| 208 { | |
| 111 | 209 build_uses.release (); |
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210 build_vdef = NULL_TREE; |
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211 build_vuse = NULL_TREE; |
| 0 | 212 } |
| 213 | |
| 111 | 214 gimple_ssa_operands (fn)->free_uses = NULL; |
| 0 | 215 |
| 111 | 216 while ((ptr = gimple_ssa_operands (fn)->operand_memory) != NULL) |
| 0 | 217 { |
| 111 | 218 gimple_ssa_operands (fn)->operand_memory |
| 219 = gimple_ssa_operands (fn)->operand_memory->next; | |
| 0 | 220 ggc_free (ptr); |
| 221 } | |
| 222 | |
| 111 | 223 gimple_ssa_operands (fn)->ops_active = false; |
| 0 | 224 |
| 225 if (!n_initialized) | |
| 226 bitmap_obstack_release (&operands_bitmap_obstack); | |
| 227 | |
| 111 | 228 fn->gimple_df->vop = NULL_TREE; |
| 0 | 229 } |
| 230 | |
| 231 | |
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232 /* Return memory for an operand of size SIZE. */ |
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233 |
| 0 | 234 static inline void * |
| 111 | 235 ssa_operand_alloc (struct function *fn, unsigned size) |
| 0 | 236 { |
| 237 char *ptr; | |
| 238 | |
| 111 | 239 gcc_assert (size == sizeof (struct use_optype_d)); |
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240 |
| 111 | 241 if (gimple_ssa_operands (fn)->operand_memory_index + size |
| 242 >= gimple_ssa_operands (fn)->ssa_operand_mem_size) | |
| 0 | 243 { |
| 244 struct ssa_operand_memory_d *ptr; | |
| 245 | |
| 111 | 246 switch (gimple_ssa_operands (fn)->ssa_operand_mem_size) |
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247 { |
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248 case OP_SIZE_INIT: |
| 111 | 249 gimple_ssa_operands (fn)->ssa_operand_mem_size = OP_SIZE_1; |
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250 break; |
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251 case OP_SIZE_1: |
| 111 | 252 gimple_ssa_operands (fn)->ssa_operand_mem_size = OP_SIZE_2; |
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253 break; |
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254 case OP_SIZE_2: |
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255 case OP_SIZE_3: |
| 111 | 256 gimple_ssa_operands (fn)->ssa_operand_mem_size = OP_SIZE_3; |
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257 break; |
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258 default: |
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259 gcc_unreachable (); |
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260 } |
| 0 | 261 |
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262 |
| 111 | 263 ptr = (ssa_operand_memory_d *) ggc_internal_alloc |
| 264 (sizeof (void *) + gimple_ssa_operands (fn)->ssa_operand_mem_size); | |
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265 |
| 111 | 266 ptr->next = gimple_ssa_operands (fn)->operand_memory; |
| 267 gimple_ssa_operands (fn)->operand_memory = ptr; | |
| 268 gimple_ssa_operands (fn)->operand_memory_index = 0; | |
| 0 | 269 } |
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270 |
| 111 | 271 ptr = &(gimple_ssa_operands (fn)->operand_memory |
| 272 ->mem[gimple_ssa_operands (fn)->operand_memory_index]); | |
| 273 gimple_ssa_operands (fn)->operand_memory_index += size; | |
| 0 | 274 return ptr; |
| 275 } | |
| 276 | |
| 277 | |
| 278 /* Allocate a USE operand. */ | |
| 279 | |
| 280 static inline struct use_optype_d * | |
| 111 | 281 alloc_use (struct function *fn) |
| 0 | 282 { |
| 283 struct use_optype_d *ret; | |
| 111 | 284 if (gimple_ssa_operands (fn)->free_uses) |
| 0 | 285 { |
| 111 | 286 ret = gimple_ssa_operands (fn)->free_uses; |
| 287 gimple_ssa_operands (fn)->free_uses | |
| 288 = gimple_ssa_operands (fn)->free_uses->next; | |
| 0 | 289 } |
| 290 else | |
| 291 ret = (struct use_optype_d *) | |
| 111 | 292 ssa_operand_alloc (fn, sizeof (struct use_optype_d)); |
| 0 | 293 return ret; |
| 294 } | |
| 295 | |
| 296 | |
| 297 /* Adds OP to the list of uses of statement STMT after LAST. */ | |
| 298 | |
| 299 static inline use_optype_p | |
| 111 | 300 add_use_op (struct function *fn, gimple *stmt, tree *op, use_optype_p last) |
| 0 | 301 { |
| 302 use_optype_p new_use; | |
| 303 | |
| 111 | 304 new_use = alloc_use (fn); |
| 0 | 305 USE_OP_PTR (new_use)->use = op; |
| 306 link_imm_use_stmt (USE_OP_PTR (new_use), *op, stmt); | |
| 307 last->next = new_use; | |
| 308 new_use->next = NULL; | |
| 309 return new_use; | |
| 310 } | |
| 311 | |
| 312 | |
| 313 | |
| 314 /* Takes elements from build_defs and turns them into def operands of STMT. | |
| 111 | 315 TODO -- Make build_defs vec of tree *. */ |
| 0 | 316 |
| 317 static inline void | |
| 111 | 318 finalize_ssa_defs (struct function *fn, gimple *stmt) |
| 0 | 319 { |
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320 /* Pre-pend the vdef we may have built. */ |
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321 if (build_vdef != NULL_TREE) |
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322 { |
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323 tree oldvdef = gimple_vdef (stmt); |
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324 if (oldvdef |
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325 && TREE_CODE (oldvdef) == SSA_NAME) |
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326 oldvdef = SSA_NAME_VAR (oldvdef); |
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327 if (oldvdef != build_vdef) |
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328 gimple_set_vdef (stmt, build_vdef); |
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329 } |
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330 |
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331 /* Clear and unlink a no longer necessary VDEF. */ |
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332 if (build_vdef == NULL_TREE |
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333 && gimple_vdef (stmt) != NULL_TREE) |
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334 { |
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335 if (TREE_CODE (gimple_vdef (stmt)) == SSA_NAME) |
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336 { |
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337 unlink_stmt_vdef (stmt); |
| 111 | 338 release_ssa_name_fn (fn, gimple_vdef (stmt)); |
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339 } |
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340 gimple_set_vdef (stmt, NULL_TREE); |
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341 } |
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342 |
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343 /* If we have a non-SSA_NAME VDEF, mark it for renaming. */ |
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344 if (gimple_vdef (stmt) |
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345 && TREE_CODE (gimple_vdef (stmt)) != SSA_NAME) |
| 0 | 346 { |
| 111 | 347 fn->gimple_df->rename_vops = 1; |
| 348 fn->gimple_df->ssa_renaming_needed = 1; | |
| 0 | 349 } |
| 350 } | |
| 351 | |
| 352 | |
| 111 | 353 /* Takes elements from build_uses and turns them into use operands of STMT. */ |
| 0 | 354 |
| 355 static inline void | |
| 111 | 356 finalize_ssa_uses (struct function *fn, gimple *stmt) |
| 0 | 357 { |
| 358 unsigned new_i; | |
| 359 struct use_optype_d new_list; | |
| 360 use_optype_p old_ops, ptr, last; | |
| 361 | |
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362 /* Pre-pend the VUSE we may have built. */ |
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363 if (build_vuse != NULL_TREE) |
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364 { |
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365 tree oldvuse = gimple_vuse (stmt); |
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366 if (oldvuse |
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367 && TREE_CODE (oldvuse) == SSA_NAME) |
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368 oldvuse = SSA_NAME_VAR (oldvuse); |
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369 if (oldvuse != (build_vuse != NULL_TREE |
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370 ? build_vuse : build_vdef)) |
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371 gimple_set_vuse (stmt, NULL_TREE); |
| 111 | 372 build_uses.safe_insert (0, gimple_vuse_ptr (stmt)); |
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373 } |
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374 |
| 0 | 375 new_list.next = NULL; |
| 376 last = &new_list; | |
| 377 | |
| 378 old_ops = gimple_use_ops (stmt); | |
| 379 | |
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380 /* Clear a no longer necessary VUSE. */ |
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381 if (build_vuse == NULL_TREE |
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382 && gimple_vuse (stmt) != NULL_TREE) |
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383 gimple_set_vuse (stmt, NULL_TREE); |
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384 |
| 0 | 385 /* If there is anything in the old list, free it. */ |
| 386 if (old_ops) | |
| 387 { | |
| 111 | 388 for (ptr = old_ops; ptr->next; ptr = ptr->next) |
| 0 | 389 delink_imm_use (USE_OP_PTR (ptr)); |
| 111 | 390 delink_imm_use (USE_OP_PTR (ptr)); |
| 391 ptr->next = gimple_ssa_operands (fn)->free_uses; | |
| 392 gimple_ssa_operands (fn)->free_uses = old_ops; | |
| 0 | 393 } |
| 394 | |
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395 /* If we added a VUSE, make sure to set the operand if it is not already |
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396 present and mark it for renaming. */ |
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397 if (build_vuse != NULL_TREE |
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398 && gimple_vuse (stmt) == NULL_TREE) |
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399 { |
| 111 | 400 gimple_set_vuse (stmt, gimple_vop (fn)); |
| 401 fn->gimple_df->rename_vops = 1; | |
| 402 fn->gimple_df->ssa_renaming_needed = 1; | |
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403 } |
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404 |
| 0 | 405 /* Now create nodes for all the new nodes. */ |
| 111 | 406 for (new_i = 0; new_i < build_uses.length (); new_i++) |
| 407 { | |
| 408 tree *op = build_uses[new_i]; | |
| 409 last = add_use_op (fn, stmt, op, last); | |
| 410 } | |
| 0 | 411 |
| 412 /* Now set the stmt's operands. */ | |
| 413 gimple_set_use_ops (stmt, new_list.next); | |
| 414 } | |
| 415 | |
| 416 | |
| 417 /* Clear the in_list bits and empty the build array for VDEFs and | |
| 418 VUSEs. */ | |
| 419 | |
| 420 static inline void | |
| 421 cleanup_build_arrays (void) | |
| 422 { | |
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423 build_vdef = NULL_TREE; |
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424 build_vuse = NULL_TREE; |
| 111 | 425 build_uses.truncate (0); |
| 0 | 426 } |
| 427 | |
| 428 | |
| 429 /* Finalize all the build vectors, fill the new ones into INFO. */ | |
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430 |
| 0 | 431 static inline void |
| 111 | 432 finalize_ssa_stmt_operands (struct function *fn, gimple *stmt) |
| 0 | 433 { |
| 111 | 434 finalize_ssa_defs (fn, stmt); |
| 435 finalize_ssa_uses (fn, stmt); | |
| 0 | 436 cleanup_build_arrays (); |
| 437 } | |
| 438 | |
| 439 | |
| 440 /* Start the process of building up operands vectors in INFO. */ | |
| 441 | |
| 442 static inline void | |
| 443 start_ssa_stmt_operands (void) | |
| 444 { | |
| 111 | 445 gcc_assert (build_uses.length () == 0); |
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446 gcc_assert (build_vuse == NULL_TREE); |
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447 gcc_assert (build_vdef == NULL_TREE); |
| 0 | 448 } |
| 449 | |
| 450 | |
| 451 /* Add USE_P to the list of pointers to operands. */ | |
| 452 | |
| 453 static inline void | |
| 454 append_use (tree *use_p) | |
| 455 { | |
| 111 | 456 build_uses.safe_push (use_p); |
| 0 | 457 } |
| 458 | |
| 459 | |
| 460 /* Add VAR to the set of variables that require a VDEF operator. */ | |
| 461 | |
| 462 static inline void | |
| 463 append_vdef (tree var) | |
| 464 { | |
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465 gcc_assert ((build_vdef == NULL_TREE |
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466 || build_vdef == var) |
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467 && (build_vuse == NULL_TREE |
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468 || build_vuse == var)); |
| 0 | 469 |
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470 build_vdef = var; |
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471 build_vuse = var; |
| 0 | 472 } |
| 473 | |
| 474 | |
| 475 /* Add VAR to the set of variables that require a VUSE operator. */ | |
| 476 | |
| 477 static inline void | |
| 478 append_vuse (tree var) | |
| 479 { | |
|
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480 gcc_assert (build_vuse == NULL_TREE |
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481 || build_vuse == var); |
| 0 | 482 |
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483 build_vuse = var; |
| 0 | 484 } |
| 485 | |
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486 /* Add virtual operands for STMT. FLAGS is as in get_expr_operands. */ |
| 0 | 487 |
| 488 static void | |
| 111 | 489 add_virtual_operand (struct function *fn, |
| 490 gimple *stmt ATTRIBUTE_UNUSED, int flags) | |
| 0 | 491 { |
|
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492 /* Add virtual operands to the stmt, unless the caller has specifically |
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493 requested not to do that (used when adding operands inside an |
| 0 | 494 ADDR_EXPR expression). */ |
| 495 if (flags & opf_no_vops) | |
| 496 return; | |
| 497 | |
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498 gcc_assert (!is_gimple_debug (stmt)); |
| 0 | 499 |
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500 if (flags & opf_def) |
| 111 | 501 append_vdef (gimple_vop (fn)); |
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502 else |
| 111 | 503 append_vuse (gimple_vop (fn)); |
| 0 | 504 } |
| 505 | |
| 506 | |
| 507 /* Add *VAR_P to the appropriate operand array for statement STMT. | |
| 508 FLAGS is as in get_expr_operands. If *VAR_P is a GIMPLE register, | |
| 509 it will be added to the statement's real operands, otherwise it is | |
| 510 added to virtual operands. */ | |
| 511 | |
| 512 static void | |
| 111 | 513 add_stmt_operand (struct function *fn, tree *var_p, gimple *stmt, int flags) |
| 0 | 514 { |
| 111 | 515 tree var = *var_p; |
| 0 | 516 |
| 145 | 517 gcc_assert (SSA_VAR_P (*var_p) |
| 518 || TREE_CODE (*var_p) == STRING_CST | |
| 519 || TREE_CODE (*var_p) == CONST_DECL); | |
| 0 | 520 |
| 111 | 521 if (is_gimple_reg (var)) |
| 0 | 522 { |
| 523 /* The variable is a GIMPLE register. Add it to real operands. */ | |
| 524 if (flags & opf_def) | |
| 111 | 525 ; |
| 0 | 526 else |
| 527 append_use (var_p); | |
| 111 | 528 if (DECL_P (*var_p)) |
| 529 fn->gimple_df->ssa_renaming_needed = 1; | |
| 0 | 530 } |
| 531 else | |
| 111 | 532 { |
| 533 /* Mark statements with volatile operands. */ | |
| 534 if (!(flags & opf_no_vops) | |
| 535 && TREE_THIS_VOLATILE (var)) | |
| 536 gimple_set_has_volatile_ops (stmt, true); | |
| 537 | |
| 538 /* The variable is a memory access. Add virtual operands. */ | |
| 539 add_virtual_operand (fn, stmt, flags); | |
| 540 } | |
| 0 | 541 } |
| 542 | |
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543 /* Mark the base address of REF as having its address taken. |
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544 REF may be a single variable whose address has been taken or any |
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545 other valid GIMPLE memory reference (structure reference, array, |
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546 etc). */ |
| 0 | 547 |
| 548 static void | |
|
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549 mark_address_taken (tree ref) |
| 0 | 550 { |
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551 tree var; |
| 0 | 552 |
|
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553 /* Note that it is *NOT OKAY* to use the target of a COMPONENT_REF |
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554 as the only thing we take the address of. If VAR is a structure, |
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555 taking the address of a field means that the whole structure may |
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556 be referenced using pointer arithmetic. See PR 21407 and the |
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557 ensuing mailing list discussion. */ |
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558 var = get_base_address (ref); |
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559 if (var) |
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560 { |
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561 if (DECL_P (var)) |
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562 TREE_ADDRESSABLE (var) = 1; |
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563 else if (TREE_CODE (var) == MEM_REF |
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564 && TREE_CODE (TREE_OPERAND (var, 0)) == ADDR_EXPR |
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565 && DECL_P (TREE_OPERAND (TREE_OPERAND (var, 0), 0))) |
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566 TREE_ADDRESSABLE (TREE_OPERAND (TREE_OPERAND (var, 0), 0)) = 1; |
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567 } |
| 0 | 568 } |
| 569 | |
| 570 | |
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571 /* A subroutine of get_expr_operands to handle MEM_REF. |
| 0 | 572 |
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573 STMT is the statement being processed, EXPR is the MEM_REF |
| 0 | 574 that got us here. |
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575 |
| 111 | 576 FLAGS is as in get_expr_operands. */ |
| 0 | 577 |
| 578 static void | |
| 111 | 579 get_mem_ref_operands (struct function *fn, |
| 580 gimple *stmt, tree expr, int flags) | |
| 0 | 581 { |
| 582 tree *pptr = &TREE_OPERAND (expr, 0); | |
| 583 | |
| 111 | 584 if (!(flags & opf_no_vops) |
| 585 && TREE_THIS_VOLATILE (expr)) | |
| 0 | 586 gimple_set_has_volatile_ops (stmt, true); |
| 587 | |
|
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588 /* Add the VOP. */ |
| 111 | 589 add_virtual_operand (fn, stmt, flags); |
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590 |
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591 /* If requested, add a USE operand for the base pointer. */ |
| 111 | 592 get_expr_operands (fn, stmt, pptr, |
| 593 opf_non_addressable | opf_use | |
| 594 | (flags & (opf_no_vops|opf_not_non_addressable))); | |
| 0 | 595 } |
| 596 | |
| 597 | |
| 598 /* A subroutine of get_expr_operands to handle TARGET_MEM_REF. */ | |
| 599 | |
| 600 static void | |
| 111 | 601 get_tmr_operands (struct function *fn, gimple *stmt, tree expr, int flags) |
| 0 | 602 { |
| 111 | 603 if (!(flags & opf_no_vops) |
| 604 && TREE_THIS_VOLATILE (expr)) | |
|
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605 gimple_set_has_volatile_ops (stmt, true); |
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606 |
| 0 | 607 /* First record the real operands. */ |
| 111 | 608 get_expr_operands (fn, stmt, |
| 609 &TMR_BASE (expr), opf_use | (flags & opf_no_vops)); | |
| 610 get_expr_operands (fn, stmt, | |
| 611 &TMR_INDEX (expr), opf_use | (flags & opf_no_vops)); | |
| 612 get_expr_operands (fn, stmt, | |
| 613 &TMR_INDEX2 (expr), opf_use | (flags & opf_no_vops)); | |
| 0 | 614 |
| 111 | 615 add_virtual_operand (fn, stmt, flags); |
| 0 | 616 } |
| 617 | |
| 618 | |
| 619 /* If STMT is a call that may clobber globals and other symbols that | |
| 620 escape, add them to the VDEF/VUSE lists for it. */ | |
| 621 | |
| 622 static void | |
| 111 | 623 maybe_add_call_vops (struct function *fn, gcall *stmt) |
| 0 | 624 { |
| 625 int call_flags = gimple_call_flags (stmt); | |
| 626 | |
| 627 /* If aliases have been computed already, add VDEF or VUSE | |
| 628 operands for all the symbols that have been found to be | |
| 629 call-clobbered. */ | |
|
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630 if (!(call_flags & ECF_NOVOPS)) |
| 0 | 631 { |
| 111 | 632 /* A 'pure' or a 'const' function never call-clobbers anything. */ |
| 633 if (!(call_flags & (ECF_PURE | ECF_CONST))) | |
| 634 add_virtual_operand (fn, stmt, opf_def); | |
| 0 | 635 else if (!(call_flags & ECF_CONST)) |
| 111 | 636 add_virtual_operand (fn, stmt, opf_use); |
| 0 | 637 } |
| 638 } | |
| 639 | |
| 640 | |
| 641 /* Scan operands in the ASM_EXPR stmt referred to in INFO. */ | |
| 642 | |
| 643 static void | |
| 111 | 644 get_asm_stmt_operands (struct function *fn, gasm *stmt) |
| 0 | 645 { |
| 646 size_t i, noutputs; | |
| 647 const char **oconstraints; | |
| 648 const char *constraint; | |
| 649 bool allows_mem, allows_reg, is_inout; | |
| 650 | |
| 651 noutputs = gimple_asm_noutputs (stmt); | |
| 652 oconstraints = (const char **) alloca ((noutputs) * sizeof (const char *)); | |
| 653 | |
| 654 /* Gather all output operands. */ | |
| 655 for (i = 0; i < gimple_asm_noutputs (stmt); i++) | |
| 656 { | |
| 657 tree link = gimple_asm_output_op (stmt, i); | |
| 658 constraint = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link))); | |
| 659 oconstraints[i] = constraint; | |
| 660 parse_output_constraint (&constraint, i, 0, 0, &allows_mem, | |
| 661 &allows_reg, &is_inout); | |
| 662 | |
| 663 /* This should have been split in gimplify_asm_expr. */ | |
| 664 gcc_assert (!allows_reg || !is_inout); | |
| 665 | |
| 666 /* Memory operands are addressable. Note that STMT needs the | |
| 667 address of this operand. */ | |
| 668 if (!allows_reg && allows_mem) | |
|
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669 mark_address_taken (TREE_VALUE (link)); |
| 0 | 670 |
| 111 | 671 get_expr_operands (fn, stmt, |
| 672 &TREE_VALUE (link), opf_def | opf_not_non_addressable); | |
| 0 | 673 } |
| 674 | |
| 675 /* Gather all input operands. */ | |
| 676 for (i = 0; i < gimple_asm_ninputs (stmt); i++) | |
| 677 { | |
| 678 tree link = gimple_asm_input_op (stmt, i); | |
| 679 constraint = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link))); | |
| 680 parse_input_constraint (&constraint, 0, 0, noutputs, 0, oconstraints, | |
| 681 &allows_mem, &allows_reg); | |
| 682 | |
| 683 /* Memory operands are addressable. Note that STMT needs the | |
| 684 address of this operand. */ | |
| 685 if (!allows_reg && allows_mem) | |
|
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686 mark_address_taken (TREE_VALUE (link)); |
| 0 | 687 |
| 111 | 688 get_expr_operands (fn, stmt, &TREE_VALUE (link), opf_not_non_addressable); |
| 0 | 689 } |
| 690 | |
| 691 /* Clobber all memory and addressable symbols for asm ("" : : : "memory"); */ | |
| 111 | 692 if (gimple_asm_clobbers_memory_p (stmt)) |
| 693 add_virtual_operand (fn, stmt, opf_def); | |
| 0 | 694 } |
| 695 | |
| 696 | |
| 697 /* Recursively scan the expression pointed to by EXPR_P in statement | |
| 698 STMT. FLAGS is one of the OPF_* constants modifying how to | |
| 699 interpret the operands found. */ | |
| 700 | |
| 701 static void | |
| 111 | 702 get_expr_operands (struct function *fn, gimple *stmt, tree *expr_p, int flags) |
| 0 | 703 { |
| 704 enum tree_code code; | |
| 705 enum tree_code_class codeclass; | |
| 706 tree expr = *expr_p; | |
|
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707 int uflags = opf_use; |
| 0 | 708 |
| 709 if (expr == NULL) | |
| 710 return; | |
| 711 | |
|
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712 if (is_gimple_debug (stmt)) |
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713 uflags |= (flags & opf_no_vops); |
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714 |
| 0 | 715 code = TREE_CODE (expr); |
| 716 codeclass = TREE_CODE_CLASS (code); | |
| 717 | |
| 718 switch (code) | |
| 719 { | |
| 720 case ADDR_EXPR: | |
| 721 /* Taking the address of a variable does not represent a | |
| 722 reference to it, but the fact that the statement takes its | |
| 723 address will be of interest to some passes (e.g. alias | |
| 724 resolution). */ | |
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725 if ((!(flags & opf_non_addressable) |
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726 || (flags & opf_not_non_addressable)) |
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727 && !is_gimple_debug (stmt)) |
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728 mark_address_taken (TREE_OPERAND (expr, 0)); |
| 0 | 729 |
| 730 /* Otherwise, there may be variables referenced inside but there | |
| 731 should be no VUSEs created, since the referenced objects are | |
| 732 not really accessed. The only operands that we should find | |
| 733 here are ARRAY_REF indices which will always be real operands | |
| 734 (GIMPLE does not allow non-registers as array indices). */ | |
| 735 flags |= opf_no_vops; | |
| 111 | 736 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 0), |
| 737 flags | opf_not_non_addressable | opf_address_taken); | |
| 0 | 738 return; |
| 739 | |
| 740 case SSA_NAME: | |
| 741 case VAR_DECL: | |
| 742 case PARM_DECL: | |
| 743 case RESULT_DECL: | |
| 131 | 744 case STRING_CST: |
| 145 | 745 case CONST_DECL: |
| 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 CASE_LABEL_EXPR: | |
| 865 /* Expressions that make no memory references. */ | |
| 866 return; | |
| 867 | |
| 868 default: | |
| 869 if (codeclass == tcc_unary) | |
| 870 goto do_unary; | |
| 871 if (codeclass == tcc_binary || codeclass == tcc_comparison) | |
| 872 goto do_binary; | |
| 873 if (codeclass == tcc_constant || codeclass == tcc_type) | |
| 874 return; | |
| 875 } | |
| 876 | |
| 877 /* If we get here, something has gone wrong. */ | |
| 111 | 878 if (flag_checking) |
| 879 { | |
| 880 fprintf (stderr, "unhandled expression in get_expr_operands():\n"); | |
| 881 debug_tree (expr); | |
| 882 fputs ("\n", stderr); | |
| 883 gcc_unreachable (); | |
| 884 } | |
| 0 | 885 } |
| 886 | |
| 887 | |
| 888 /* Parse STMT looking for operands. When finished, the various | |
| 889 build_* operand vectors will have potential operands in them. */ | |
| 890 | |
| 891 static void | |
| 111 | 892 parse_ssa_operands (struct function *fn, gimple *stmt) |
| 0 | 893 { |
| 894 enum gimple_code code = gimple_code (stmt); | |
| 111 | 895 size_t i, n, start = 0; |
| 0 | 896 |
| 111 | 897 switch (code) |
|
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898 { |
| 111 | 899 case GIMPLE_ASM: |
| 900 get_asm_stmt_operands (fn, as_a <gasm *> (stmt)); | |
| 901 break; | |
| 902 | |
| 903 case GIMPLE_TRANSACTION: | |
| 904 /* The start of a transaction is a memory barrier. */ | |
| 905 add_virtual_operand (fn, stmt, opf_def | opf_use); | |
| 906 break; | |
| 907 | |
| 908 case GIMPLE_DEBUG: | |
|
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909 if (gimple_debug_bind_p (stmt) |
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910 && gimple_debug_bind_has_value_p (stmt)) |
| 111 | 911 get_expr_operands (fn, stmt, gimple_debug_bind_get_value_ptr (stmt), |
|
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912 opf_use | opf_no_vops); |
| 111 | 913 break; |
| 914 | |
| 915 case GIMPLE_RETURN: | |
| 916 append_vuse (gimple_vop (fn)); | |
| 917 goto do_default; | |
| 0 | 918 |
| 111 | 919 case GIMPLE_CALL: |
| 920 /* Add call-clobbered operands, if needed. */ | |
| 921 maybe_add_call_vops (fn, as_a <gcall *> (stmt)); | |
| 922 /* FALLTHRU */ | |
| 0 | 923 |
| 111 | 924 case GIMPLE_ASSIGN: |
| 925 get_expr_operands (fn, stmt, gimple_op_ptr (stmt, 0), opf_def); | |
| 926 start = 1; | |
| 927 /* FALLTHRU */ | |
| 0 | 928 |
| 111 | 929 default: |
| 930 do_default: | |
| 931 n = gimple_num_ops (stmt); | |
| 932 for (i = start; i < n; i++) | |
| 933 get_expr_operands (fn, stmt, gimple_op_ptr (stmt, i), opf_use); | |
| 934 break; | |
| 0 | 935 } |
| 936 } | |
| 937 | |
| 938 | |
| 939 /* Create an operands cache for STMT. */ | |
| 940 | |
| 941 static void | |
| 111 | 942 build_ssa_operands (struct function *fn, gimple *stmt) |
| 0 | 943 { |
|
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944 /* Initially assume that the statement has no volatile operands. */ |
| 0 | 945 gimple_set_has_volatile_ops (stmt, false); |
| 946 | |
| 947 start_ssa_stmt_operands (); | |
| 111 | 948 parse_ssa_operands (fn, stmt); |
| 949 finalize_ssa_stmt_operands (fn, stmt); | |
| 950 } | |
| 951 | |
| 952 /* Verifies SSA statement operands. */ | |
| 953 | |
| 954 DEBUG_FUNCTION bool | |
| 955 verify_ssa_operands (struct function *fn, gimple *stmt) | |
| 956 { | |
| 957 use_operand_p use_p; | |
| 958 def_operand_p def_p; | |
| 959 ssa_op_iter iter; | |
| 960 unsigned i; | |
| 961 tree def; | |
| 962 bool volatile_p = gimple_has_volatile_ops (stmt); | |
| 963 | |
| 964 /* build_ssa_operands w/o finalizing them. */ | |
| 965 gimple_set_has_volatile_ops (stmt, false); | |
| 966 start_ssa_stmt_operands (); | |
| 967 parse_ssa_operands (fn, stmt); | |
| 968 | |
| 969 /* Now verify the built operands are the same as present in STMT. */ | |
| 970 def = gimple_vdef (stmt); | |
| 971 if (def | |
| 972 && TREE_CODE (def) == SSA_NAME) | |
| 973 def = SSA_NAME_VAR (def); | |
| 974 if (build_vdef != def) | |
| 975 { | |
| 145 | 976 error ("virtual definition of statement not up to date"); |
| 111 | 977 return true; |
| 978 } | |
| 979 if (gimple_vdef (stmt) | |
| 980 && ((def_p = gimple_vdef_op (stmt)) == NULL_DEF_OPERAND_P | |
| 981 || DEF_FROM_PTR (def_p) != gimple_vdef (stmt))) | |
| 982 { | |
| 145 | 983 error ("virtual def operand missing for statement"); |
| 111 | 984 return true; |
| 985 } | |
| 986 | |
| 987 tree use = gimple_vuse (stmt); | |
| 988 if (use | |
| 989 && TREE_CODE (use) == SSA_NAME) | |
| 990 use = SSA_NAME_VAR (use); | |
| 991 if (build_vuse != use) | |
| 992 { | |
| 145 | 993 error ("virtual use of statement not up to date"); |
| 111 | 994 return true; |
| 995 } | |
| 996 if (gimple_vuse (stmt) | |
| 997 && ((use_p = gimple_vuse_op (stmt)) == NULL_USE_OPERAND_P | |
| 998 || USE_FROM_PTR (use_p) != gimple_vuse (stmt))) | |
| 999 { | |
| 145 | 1000 error ("virtual use operand missing for statement"); |
| 111 | 1001 return true; |
| 1002 } | |
| 1003 | |
| 1004 FOR_EACH_SSA_USE_OPERAND (use_p, stmt, iter, SSA_OP_USE) | |
| 1005 { | |
| 1006 tree *op; | |
| 1007 FOR_EACH_VEC_ELT (build_uses, i, op) | |
| 1008 { | |
| 1009 if (use_p->use == op) | |
| 1010 { | |
| 1011 build_uses[i] = NULL; | |
| 1012 break; | |
| 1013 } | |
| 1014 } | |
| 1015 if (i == build_uses.length ()) | |
| 1016 { | |
| 145 | 1017 error ("excess use operand for statement"); |
| 111 | 1018 debug_generic_expr (USE_FROM_PTR (use_p)); |
| 1019 return true; | |
| 1020 } | |
| 1021 } | |
| 1022 | |
| 1023 tree *op; | |
| 1024 FOR_EACH_VEC_ELT (build_uses, i, op) | |
| 1025 if (op != NULL) | |
| 1026 { | |
| 145 | 1027 error ("use operand missing for statement"); |
| 111 | 1028 debug_generic_expr (*op); |
| 1029 return true; | |
| 1030 } | |
| 1031 | |
| 1032 if (gimple_has_volatile_ops (stmt) != volatile_p) | |
| 1033 { | |
| 145 | 1034 error ("statement volatile flag not up to date"); |
| 111 | 1035 return true; |
| 1036 } | |
| 1037 | |
| 1038 cleanup_build_arrays (); | |
| 1039 return false; | |
| 0 | 1040 } |
| 1041 | |
| 1042 | |
| 1043 /* Releases the operands of STMT back to their freelists, and clears | |
| 1044 the stmt operand lists. */ | |
| 1045 | |
| 1046 void | |
| 111 | 1047 free_stmt_operands (struct function *fn, gimple *stmt) |
| 0 | 1048 { |
| 1049 use_optype_p uses = gimple_use_ops (stmt), last_use; | |
| 1050 | |
| 1051 if (uses) | |
| 1052 { | |
| 1053 for (last_use = uses; last_use->next; last_use = last_use->next) | |
| 1054 delink_imm_use (USE_OP_PTR (last_use)); | |
| 1055 delink_imm_use (USE_OP_PTR (last_use)); | |
| 111 | 1056 last_use->next = gimple_ssa_operands (fn)->free_uses; |
| 1057 gimple_ssa_operands (fn)->free_uses = uses; | |
| 0 | 1058 gimple_set_use_ops (stmt, NULL); |
| 1059 } | |
| 1060 | |
| 1061 if (gimple_has_mem_ops (stmt)) | |
| 1062 { | |
|
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|
1063 gimple_set_vuse (stmt, NULL_TREE); |
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1064 gimple_set_vdef (stmt, NULL_TREE); |
| 0 | 1065 } |
| 1066 } | |
| 1067 | |
| 1068 | |
| 1069 /* Get the operands of statement STMT. */ | |
| 1070 | |
| 1071 void | |
| 111 | 1072 update_stmt_operands (struct function *fn, gimple *stmt) |
| 0 | 1073 { |
| 1074 /* If update_stmt_operands is called before SSA is initialized, do | |
| 1075 nothing. */ | |
| 111 | 1076 if (!ssa_operands_active (fn)) |
| 0 | 1077 return; |
| 1078 | |
| 1079 timevar_push (TV_TREE_OPS); | |
| 1080 | |
| 1081 gcc_assert (gimple_modified_p (stmt)); | |
| 111 | 1082 build_ssa_operands (fn, stmt); |
| 0 | 1083 gimple_set_modified (stmt, false); |
| 1084 | |
| 1085 timevar_pop (TV_TREE_OPS); | |
| 1086 } | |
| 1087 | |
| 1088 | |
| 1089 /* Swap operands EXP0 and EXP1 in statement STMT. No attempt is done | |
| 1090 to test the validity of the swap operation. */ | |
| 1091 | |
| 1092 void | |
| 111 | 1093 swap_ssa_operands (gimple *stmt, tree *exp0, tree *exp1) |
| 0 | 1094 { |
| 1095 tree op0, op1; | |
| 1096 op0 = *exp0; | |
| 1097 op1 = *exp1; | |
| 1098 | |
| 111 | 1099 if (op0 != op1) |
| 0 | 1100 { |
| 111 | 1101 /* Attempt to preserve the relative positions of these two operands in |
| 1102 their * respective immediate use lists by adjusting their use pointer | |
| 1103 to point to the new operand position. */ | |
| 0 | 1104 use_optype_p use0, use1, ptr; |
| 1105 use0 = use1 = NULL; | |
| 1106 | |
| 1107 /* Find the 2 operands in the cache, if they are there. */ | |
| 1108 for (ptr = gimple_use_ops (stmt); ptr; ptr = ptr->next) | |
| 1109 if (USE_OP_PTR (ptr)->use == exp0) | |
| 1110 { | |
| 1111 use0 = ptr; | |
| 1112 break; | |
| 1113 } | |
| 1114 | |
| 1115 for (ptr = gimple_use_ops (stmt); ptr; ptr = ptr->next) | |
| 1116 if (USE_OP_PTR (ptr)->use == exp1) | |
| 1117 { | |
| 1118 use1 = ptr; | |
| 1119 break; | |
| 1120 } | |
| 1121 | |
| 111 | 1122 /* And adjust their location to point to the new position of the |
| 1123 operand. */ | |
| 1124 if (use0) | |
| 1125 USE_OP_PTR (use0)->use = exp1; | |
| 1126 if (use1) | |
| 1127 USE_OP_PTR (use1)->use = exp0; | |
| 1128 | |
| 1129 /* Now swap the data. */ | |
| 1130 *exp0 = op1; | |
| 1131 *exp1 = op0; | |
| 0 | 1132 } |
| 1133 } | |
| 1134 | |
| 1135 | |
| 1136 /* Scan the immediate_use list for VAR making sure its linked properly. | |
| 1137 Return TRUE if there is a problem and emit an error message to F. */ | |
| 1138 | |
|
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|
1139 DEBUG_FUNCTION bool |
| 0 | 1140 verify_imm_links (FILE *f, tree var) |
| 1141 { | |
| 1142 use_operand_p ptr, prev, list; | |
| 111 | 1143 unsigned int count; |
| 0 | 1144 |
| 1145 gcc_assert (TREE_CODE (var) == SSA_NAME); | |
| 1146 | |
| 1147 list = &(SSA_NAME_IMM_USE_NODE (var)); | |
| 1148 gcc_assert (list->use == NULL); | |
| 1149 | |
| 1150 if (list->prev == NULL) | |
| 1151 { | |
| 1152 gcc_assert (list->next == NULL); | |
| 1153 return false; | |
| 1154 } | |
| 1155 | |
| 1156 prev = list; | |
| 1157 count = 0; | |
| 1158 for (ptr = list->next; ptr != list; ) | |
| 1159 { | |
| 1160 if (prev != ptr->prev) | |
| 111 | 1161 { |
| 1162 fprintf (f, "prev != ptr->prev\n"); | |
| 1163 goto error; | |
| 1164 } | |
|
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1165 |
| 0 | 1166 if (ptr->use == NULL) |
| 111 | 1167 { |
| 1168 fprintf (f, "ptr->use == NULL\n"); | |
| 1169 goto error; /* 2 roots, or SAFE guard node. */ | |
| 1170 } | |
| 0 | 1171 else if (*(ptr->use) != var) |
| 111 | 1172 { |
| 1173 fprintf (f, "*(ptr->use) != var\n"); | |
| 1174 goto error; | |
| 1175 } | |
| 0 | 1176 |
| 1177 prev = ptr; | |
| 1178 ptr = ptr->next; | |
| 1179 | |
| 111 | 1180 count++; |
| 1181 if (count == 0) | |
| 1182 { | |
| 1183 fprintf (f, "number of immediate uses doesn't fit unsigned int\n"); | |
| 1184 goto error; | |
| 1185 } | |
| 0 | 1186 } |
| 1187 | |
| 1188 /* Verify list in the other direction. */ | |
| 1189 prev = list; | |
| 1190 for (ptr = list->prev; ptr != list; ) | |
| 1191 { | |
| 1192 if (prev != ptr->next) | |
| 111 | 1193 { |
| 1194 fprintf (f, "prev != ptr->next\n"); | |
| 1195 goto error; | |
| 1196 } | |
| 0 | 1197 prev = ptr; |
| 1198 ptr = ptr->prev; | |
| 111 | 1199 if (count == 0) |
| 1200 { | |
| 1201 fprintf (f, "count-- < 0\n"); | |
| 1202 goto error; | |
| 1203 } | |
| 1204 count--; | |
| 0 | 1205 } |
| 1206 | |
| 1207 if (count != 0) | |
| 111 | 1208 { |
| 1209 fprintf (f, "count != 0\n"); | |
| 1210 goto error; | |
| 1211 } | |
| 0 | 1212 |
| 1213 return false; | |
| 1214 | |
| 1215 error: | |
| 1216 if (ptr->loc.stmt && gimple_modified_p (ptr->loc.stmt)) | |
| 1217 { | |
| 1218 fprintf (f, " STMT MODIFIED. - <%p> ", (void *)ptr->loc.stmt); | |
| 1219 print_gimple_stmt (f, ptr->loc.stmt, 0, TDF_SLIM); | |
| 1220 } | |
|
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1221 fprintf (f, " IMM ERROR : (use_p : tree - %p:%p)", (void *)ptr, |
| 0 | 1222 (void *)ptr->use); |
| 1223 print_generic_expr (f, USE_FROM_PTR (ptr), TDF_SLIM); | |
| 111 | 1224 fprintf (f, "\n"); |
| 0 | 1225 return true; |
| 1226 } | |
| 1227 | |
| 1228 | |
| 1229 /* Dump all the immediate uses to FILE. */ | |
| 1230 | |
| 1231 void | |
| 1232 dump_immediate_uses_for (FILE *file, tree var) | |
| 1233 { | |
| 1234 imm_use_iterator iter; | |
| 1235 use_operand_p use_p; | |
| 1236 | |
| 1237 gcc_assert (var && TREE_CODE (var) == SSA_NAME); | |
| 1238 | |
| 1239 print_generic_expr (file, var, TDF_SLIM); | |
| 1240 fprintf (file, " : -->"); | |
| 1241 if (has_zero_uses (var)) | |
| 1242 fprintf (file, " no uses.\n"); | |
| 1243 else | |
| 1244 if (has_single_use (var)) | |
| 1245 fprintf (file, " single use.\n"); | |
| 1246 else | |
| 1247 fprintf (file, "%d uses.\n", num_imm_uses (var)); | |
| 1248 | |
| 1249 FOR_EACH_IMM_USE_FAST (use_p, iter, var) | |
| 1250 { | |
| 1251 if (use_p->loc.stmt == NULL && use_p->use == NULL) | |
| 1252 fprintf (file, "***end of stmt iterator marker***\n"); | |
| 1253 else | |
| 1254 if (!is_gimple_reg (USE_FROM_PTR (use_p))) | |
| 1255 print_gimple_stmt (file, USE_STMT (use_p), 0, TDF_VOPS|TDF_MEMSYMS); | |
| 1256 else | |
| 1257 print_gimple_stmt (file, USE_STMT (use_p), 0, TDF_SLIM); | |
| 1258 } | |
| 111 | 1259 fprintf (file, "\n"); |
| 0 | 1260 } |
| 1261 | |
| 1262 | |
| 1263 /* Dump all the immediate uses to FILE. */ | |
| 1264 | |
| 1265 void | |
| 1266 dump_immediate_uses (FILE *file) | |
| 1267 { | |
| 1268 tree var; | |
| 1269 unsigned int x; | |
| 1270 | |
| 1271 fprintf (file, "Immediate_uses: \n\n"); | |
| 111 | 1272 FOR_EACH_SSA_NAME (x, var, cfun) |
| 0 | 1273 { |
| 1274 dump_immediate_uses_for (file, var); | |
| 1275 } | |
| 1276 } | |
| 1277 | |
| 1278 | |
| 1279 /* Dump def-use edges on stderr. */ | |
| 1280 | |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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diff
changeset
|
1281 DEBUG_FUNCTION void |
| 0 | 1282 debug_immediate_uses (void) |
| 1283 { | |
| 1284 dump_immediate_uses (stderr); | |
| 1285 } | |
| 1286 | |
| 1287 | |
| 1288 /* Dump def-use edges on stderr. */ | |
| 1289 | |
|
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parents:
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diff
changeset
|
1290 DEBUG_FUNCTION void |
| 0 | 1291 debug_immediate_uses_for (tree var) |
| 1292 { | |
| 1293 dump_immediate_uses_for (stderr, var); | |
| 1294 } | |
| 1295 | |
| 1296 | |
|
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parents:
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1297 /* Unlink STMTs virtual definition from the IL by propagating its use. */ |
| 0 | 1298 |
| 1299 void | |
| 111 | 1300 unlink_stmt_vdef (gimple *stmt) |
| 0 | 1301 { |
|
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parents:
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1302 use_operand_p use_p; |
|
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parents:
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1303 imm_use_iterator iter; |
| 111 | 1304 gimple *use_stmt; |
|
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parents:
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1305 tree vdef = gimple_vdef (stmt); |
| 111 | 1306 tree vuse = gimple_vuse (stmt); |
| 0 | 1307 |
|
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parents:
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1308 if (!vdef |
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parents:
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1309 || TREE_CODE (vdef) != SSA_NAME) |
| 0 | 1310 return; |
| 1311 | |
| 111 | 1312 FOR_EACH_IMM_USE_STMT (use_stmt, iter, vdef) |
| 0 | 1313 { |
|
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parents:
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1314 FOR_EACH_IMM_USE_ON_STMT (use_p, iter) |
| 111 | 1315 SET_USE (use_p, vuse); |
| 0 | 1316 } |
| 1317 | |
| 111 | 1318 if (SSA_NAME_OCCURS_IN_ABNORMAL_PHI (vdef)) |
| 1319 SSA_NAME_OCCURS_IN_ABNORMAL_PHI (vuse) = 1; | |
| 0 | 1320 } |
| 1321 | |
| 111 | 1322 /* Return true if the var whose chain of uses starts at PTR has a |
| 1323 single nondebug use. Set USE_P and STMT to that single nondebug | |
| 1324 use, if so, or to NULL otherwise. */ | |
| 1325 bool | |
| 1326 single_imm_use_1 (const ssa_use_operand_t *head, | |
| 1327 use_operand_p *use_p, gimple **stmt) | |
| 1328 { | |
| 1329 ssa_use_operand_t *ptr, *single_use = 0; | |
| 1330 | |
| 1331 for (ptr = head->next; ptr != head; ptr = ptr->next) | |
| 1332 if (USE_STMT(ptr) && !is_gimple_debug (USE_STMT (ptr))) | |
| 1333 { | |
| 1334 if (single_use) | |
| 1335 { | |
| 1336 single_use = NULL; | |
| 1337 break; | |
| 1338 } | |
| 1339 single_use = ptr; | |
| 1340 } | |
| 1341 | |
| 1342 if (use_p) | |
| 1343 *use_p = single_use; | |
| 1344 | |
| 1345 if (stmt) | |
| 1346 *stmt = single_use ? single_use->loc.stmt : NULL; | |
| 1347 | |
| 1348 return single_use; | |
| 1349 } | |
| 1350 |