Mercurial > hg > CbC > CbC_gcc
annotate gcc/tree-ssa-operands.c @ 112:ab0bcb71f44d
merge gcc 7
| author | mir3636 |
|---|---|
| date | Fri, 10 Nov 2017 19:46:38 +0900 |
| parents | 04ced10e8804 1b10fe6932e1 |
| children | f81c5aa9f14f |
| 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" |
| 112 | 29 <<<<<<< local |
| 111 | 30 #include "diagnostic-core.h" |
| 31 #include "stmt.h" | |
| 32 #include "print-tree.h" | |
| 33 #include "dumpfile.h" | |
| 34 | |
| 112 | 35 ======= |
| 0 | 36 #include "tree-flow.h" |
| 37 #include "tree-inline.h" | |
| 38 #include "tree-pass.h" | |
| 39 #include "ggc.h" | |
| 40 #include "timevar.h" | |
| 41 #include "langhooks.h" | |
| 42 #include "ipa-reference.h" | |
| 1 | 43 #ifndef noCbC |
| 44 #include "cbc-tree.h" | |
| 45 #endif | |
| 112 | 46 >>>>>>> other |
| 0 | 47 |
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48 /* This file contains the code required to manage the operands cache of the |
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49 SSA optimizer. For every stmt, we maintain an operand cache in the stmt |
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50 annotation. This cache contains operands that will be of interest to |
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51 optimizers and other passes wishing to manipulate the IL. |
| 0 | 52 |
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53 The operand type are broken up into REAL and VIRTUAL operands. The real |
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54 operands are represented as pointers into the stmt's operand tree. Thus |
| 0 | 55 any manipulation of the real operands will be reflected in the actual tree. |
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56 Virtual operands are represented solely in the cache, although the base |
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57 variable for the SSA_NAME may, or may not occur in the stmt's tree. |
| 0 | 58 Manipulation of the virtual operands will not be reflected in the stmt tree. |
| 59 | |
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60 The routines in this file are concerned with creating this operand cache |
| 0 | 61 from a stmt tree. |
| 62 | |
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63 The operand tree is the parsed by the various get_* routines which look |
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64 through the stmt tree for the occurrence of operands which may be of |
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65 interest, and calls are made to the append_* routines whenever one is |
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66 found. There are 4 of these routines, each representing one of the |
| 0 | 67 4 types of operands. Defs, Uses, Virtual Uses, and Virtual May Defs. |
| 68 | |
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69 The append_* routines check for duplication, and simply keep a list of |
| 0 | 70 unique objects for each operand type in the build_* extendable vectors. |
| 71 | |
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72 Once the stmt tree is completely parsed, the finalize_ssa_operands() |
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73 routine is called, which proceeds to perform the finalization routine |
| 0 | 74 on each of the 4 operand vectors which have been built up. |
| 75 | |
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76 If the stmt had a previous operand cache, the finalization routines |
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77 attempt to match up the new operands with the old ones. If it's a perfect |
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78 match, the old vector is simply reused. If it isn't a perfect match, then |
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79 a new vector is created and the new operands are placed there. For |
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80 virtual operands, if the previous cache had SSA_NAME version of a |
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81 variable, and that same variable occurs in the same operands cache, then |
| 0 | 82 the new cache vector will also get the same SSA_NAME. |
| 83 | |
| 84 i.e., if a stmt had a VUSE of 'a_5', and 'a' occurs in the new | |
| 85 operand vector for VUSE, then the new vector will also be modified | |
| 86 such that it contains 'a_5' rather than 'a'. */ | |
| 87 | |
| 88 | |
| 89 /* Flags to describe operand properties in helpers. */ | |
| 90 | |
| 91 /* By default, operands are loaded. */ | |
| 92 #define opf_use 0 | |
| 93 | |
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94 /* Operand is the target of an assignment expression or a |
| 0 | 95 call-clobbered variable. */ |
| 96 #define opf_def (1 << 0) | |
| 97 | |
| 98 /* No virtual operands should be created in the expression. This is used | |
| 99 when traversing ADDR_EXPR nodes which have different semantics than | |
| 100 other expressions. Inside an ADDR_EXPR node, the only operands that we | |
| 101 need to consider are indices into arrays. For instance, &a.b[i] should | |
| 102 generate a USE of 'i' but it should not generate a VUSE for 'a' nor a | |
| 103 VUSE for 'b'. */ | |
| 104 #define opf_no_vops (1 << 1) | |
| 105 | |
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106 /* Operand is in a place where address-taken does not imply addressable. */ |
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107 #define opf_non_addressable (1 << 3) |
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108 |
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109 /* Operand is in a place where opf_non_addressable does not apply. */ |
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110 #define opf_not_non_addressable (1 << 4) |
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111 |
| 111 | 112 /* Operand is having its address taken. */ |
| 113 #define opf_address_taken (1 << 5) | |
| 0 | 114 |
| 115 /* Array for building all the use operands. */ | |
| 111 | 116 static vec<tree *> build_uses; |
| 0 | 117 |
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118 /* The built VDEF operand. */ |
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119 static tree build_vdef; |
| 0 | 120 |
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121 /* The built VUSE operand. */ |
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122 static tree build_vuse; |
| 0 | 123 |
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124 /* Bitmap obstack for our datastructures that needs to survive across |
| 0 | 125 compilations of multiple functions. */ |
| 126 static bitmap_obstack operands_bitmap_obstack; | |
| 127 | |
| 111 | 128 static void get_expr_operands (struct function *, gimple *, tree *, int); |
| 0 | 129 |
| 130 /* Number of functions with initialized ssa_operands. */ | |
| 131 static int n_initialized = 0; | |
| 132 | |
| 111 | 133 /* Accessor to tree-ssa-operands.c caches. */ |
| 134 static inline struct ssa_operands * | |
| 135 gimple_ssa_operands (const struct function *fun) | |
| 0 | 136 { |
| 111 | 137 return &fun->gimple_df->ssa_operands; |
| 0 | 138 } |
| 139 | |
| 140 | |
| 141 /* Return true if the SSA operands cache is active. */ | |
| 142 | |
| 143 bool | |
| 111 | 144 ssa_operands_active (struct function *fun) |
| 0 | 145 { |
| 111 | 146 if (fun == NULL) |
| 0 | 147 return false; |
| 148 | |
| 111 | 149 return fun->gimple_df && gimple_ssa_operands (fun)->ops_active; |
| 0 | 150 } |
| 151 | |
| 152 | |
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153 /* Create the VOP variable, an artificial global variable to act as a |
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154 representative of all of the virtual operands FUD chain. */ |
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155 |
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156 static void |
| 111 | 157 create_vop_var (struct function *fn) |
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158 { |
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159 tree global_var; |
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160 |
| 111 | 161 gcc_assert (fn->gimple_df->vop == NULL_TREE); |
| 0 | 162 |
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163 global_var = build_decl (BUILTINS_LOCATION, VAR_DECL, |
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164 get_identifier (".MEM"), |
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165 void_type_node); |
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166 DECL_ARTIFICIAL (global_var) = 1; |
| 111 | 167 DECL_IGNORED_P (global_var) = 1; |
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168 TREE_READONLY (global_var) = 0; |
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169 DECL_EXTERNAL (global_var) = 1; |
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170 TREE_STATIC (global_var) = 1; |
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171 TREE_USED (global_var) = 1; |
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172 DECL_CONTEXT (global_var) = NULL_TREE; |
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173 TREE_THIS_VOLATILE (global_var) = 0; |
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174 TREE_ADDRESSABLE (global_var) = 0; |
| 111 | 175 VAR_DECL_IS_VIRTUAL_OPERAND (global_var) = 1; |
| 0 | 176 |
| 111 | 177 fn->gimple_df->vop = global_var; |
| 0 | 178 } |
| 179 | |
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180 /* These are the sizes of the operand memory buffer in bytes which gets |
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181 allocated each time more operands space is required. The final value is |
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182 the amount that is allocated every time after that. |
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183 In 1k we can fit 25 use operands (or 63 def operands) on a host with |
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184 8 byte pointers, that would be 10 statements each with 1 def and 2 |
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185 uses. */ |
| 0 | 186 |
| 187 #define OP_SIZE_INIT 0 | |
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188 #define OP_SIZE_1 (1024 - sizeof (void *)) |
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189 #define OP_SIZE_2 (1024 * 4 - sizeof (void *)) |
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190 #define OP_SIZE_3 (1024 * 16 - sizeof (void *)) |
| 0 | 191 |
| 192 /* Initialize the operand cache routines. */ | |
| 193 | |
| 194 void | |
| 111 | 195 init_ssa_operands (struct function *fn) |
| 0 | 196 { |
| 197 if (!n_initialized++) | |
| 198 { | |
| 111 | 199 build_uses.create (10); |
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200 build_vuse = NULL_TREE; |
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201 build_vdef = NULL_TREE; |
| 0 | 202 bitmap_obstack_initialize (&operands_bitmap_obstack); |
| 203 } | |
| 204 | |
| 111 | 205 gcc_assert (gimple_ssa_operands (fn)->operand_memory == NULL); |
| 206 gimple_ssa_operands (fn)->operand_memory_index | |
| 207 = gimple_ssa_operands (fn)->ssa_operand_mem_size; | |
| 208 gimple_ssa_operands (fn)->ops_active = true; | |
| 209 gimple_ssa_operands (fn)->ssa_operand_mem_size = OP_SIZE_INIT; | |
| 210 create_vop_var (fn); | |
| 0 | 211 } |
| 212 | |
| 213 | |
| 214 /* Dispose of anything required by the operand routines. */ | |
| 215 | |
| 216 void | |
| 111 | 217 fini_ssa_operands (struct function *fn) |
| 0 | 218 { |
| 219 struct ssa_operand_memory_d *ptr; | |
| 220 | |
| 221 if (!--n_initialized) | |
| 222 { | |
| 111 | 223 build_uses.release (); |
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224 build_vdef = NULL_TREE; |
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225 build_vuse = NULL_TREE; |
| 0 | 226 } |
| 227 | |
| 111 | 228 gimple_ssa_operands (fn)->free_uses = NULL; |
| 0 | 229 |
| 111 | 230 while ((ptr = gimple_ssa_operands (fn)->operand_memory) != NULL) |
| 0 | 231 { |
| 111 | 232 gimple_ssa_operands (fn)->operand_memory |
| 233 = gimple_ssa_operands (fn)->operand_memory->next; | |
| 0 | 234 ggc_free (ptr); |
| 235 } | |
| 236 | |
| 111 | 237 gimple_ssa_operands (fn)->ops_active = false; |
| 0 | 238 |
| 239 if (!n_initialized) | |
| 240 bitmap_obstack_release (&operands_bitmap_obstack); | |
| 241 | |
| 111 | 242 fn->gimple_df->vop = NULL_TREE; |
| 0 | 243 } |
| 244 | |
| 245 | |
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246 /* Return memory for an operand of size SIZE. */ |
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247 |
| 0 | 248 static inline void * |
| 111 | 249 ssa_operand_alloc (struct function *fn, unsigned size) |
| 0 | 250 { |
| 251 char *ptr; | |
| 252 | |
| 111 | 253 gcc_assert (size == sizeof (struct use_optype_d)); |
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254 |
| 111 | 255 if (gimple_ssa_operands (fn)->operand_memory_index + size |
| 256 >= gimple_ssa_operands (fn)->ssa_operand_mem_size) | |
| 0 | 257 { |
| 258 struct ssa_operand_memory_d *ptr; | |
| 259 | |
| 111 | 260 switch (gimple_ssa_operands (fn)->ssa_operand_mem_size) |
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261 { |
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262 case OP_SIZE_INIT: |
| 111 | 263 gimple_ssa_operands (fn)->ssa_operand_mem_size = OP_SIZE_1; |
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264 break; |
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265 case OP_SIZE_1: |
| 111 | 266 gimple_ssa_operands (fn)->ssa_operand_mem_size = OP_SIZE_2; |
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267 break; |
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268 case OP_SIZE_2: |
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269 case OP_SIZE_3: |
| 111 | 270 gimple_ssa_operands (fn)->ssa_operand_mem_size = OP_SIZE_3; |
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271 break; |
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272 default: |
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273 gcc_unreachable (); |
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274 } |
| 0 | 275 |
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276 |
| 111 | 277 ptr = (ssa_operand_memory_d *) ggc_internal_alloc |
| 278 (sizeof (void *) + gimple_ssa_operands (fn)->ssa_operand_mem_size); | |
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279 |
| 111 | 280 ptr->next = gimple_ssa_operands (fn)->operand_memory; |
| 281 gimple_ssa_operands (fn)->operand_memory = ptr; | |
| 282 gimple_ssa_operands (fn)->operand_memory_index = 0; | |
| 0 | 283 } |
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284 |
| 111 | 285 ptr = &(gimple_ssa_operands (fn)->operand_memory |
| 286 ->mem[gimple_ssa_operands (fn)->operand_memory_index]); | |
| 287 gimple_ssa_operands (fn)->operand_memory_index += size; | |
| 0 | 288 return ptr; |
| 289 } | |
| 290 | |
| 291 | |
| 292 /* Allocate a USE operand. */ | |
| 293 | |
| 294 static inline struct use_optype_d * | |
| 111 | 295 alloc_use (struct function *fn) |
| 0 | 296 { |
| 297 struct use_optype_d *ret; | |
| 111 | 298 if (gimple_ssa_operands (fn)->free_uses) |
| 0 | 299 { |
| 111 | 300 ret = gimple_ssa_operands (fn)->free_uses; |
| 301 gimple_ssa_operands (fn)->free_uses | |
| 302 = gimple_ssa_operands (fn)->free_uses->next; | |
| 0 | 303 } |
| 304 else | |
| 305 ret = (struct use_optype_d *) | |
| 111 | 306 ssa_operand_alloc (fn, sizeof (struct use_optype_d)); |
| 0 | 307 return ret; |
| 308 } | |
| 309 | |
| 310 | |
| 311 /* Adds OP to the list of uses of statement STMT after LAST. */ | |
| 312 | |
| 313 static inline use_optype_p | |
| 111 | 314 add_use_op (struct function *fn, gimple *stmt, tree *op, use_optype_p last) |
| 0 | 315 { |
| 316 use_optype_p new_use; | |
| 317 | |
| 111 | 318 new_use = alloc_use (fn); |
| 0 | 319 USE_OP_PTR (new_use)->use = op; |
| 320 link_imm_use_stmt (USE_OP_PTR (new_use), *op, stmt); | |
| 321 last->next = new_use; | |
| 322 new_use->next = NULL; | |
| 323 return new_use; | |
| 324 } | |
| 325 | |
| 326 | |
| 327 | |
| 328 /* Takes elements from build_defs and turns them into def operands of STMT. | |
| 111 | 329 TODO -- Make build_defs vec of tree *. */ |
| 0 | 330 |
| 331 static inline void | |
| 111 | 332 finalize_ssa_defs (struct function *fn, gimple *stmt) |
| 0 | 333 { |
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334 /* Pre-pend the vdef we may have built. */ |
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335 if (build_vdef != NULL_TREE) |
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336 { |
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337 tree oldvdef = gimple_vdef (stmt); |
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338 if (oldvdef |
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339 && TREE_CODE (oldvdef) == SSA_NAME) |
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340 oldvdef = SSA_NAME_VAR (oldvdef); |
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341 if (oldvdef != build_vdef) |
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342 gimple_set_vdef (stmt, build_vdef); |
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343 } |
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344 |
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345 /* Clear and unlink a no longer necessary VDEF. */ |
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346 if (build_vdef == NULL_TREE |
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347 && gimple_vdef (stmt) != NULL_TREE) |
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348 { |
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349 if (TREE_CODE (gimple_vdef (stmt)) == SSA_NAME) |
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350 { |
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351 unlink_stmt_vdef (stmt); |
| 111 | 352 release_ssa_name_fn (fn, gimple_vdef (stmt)); |
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353 } |
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354 gimple_set_vdef (stmt, NULL_TREE); |
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355 } |
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356 |
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357 /* If we have a non-SSA_NAME VDEF, mark it for renaming. */ |
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358 if (gimple_vdef (stmt) |
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359 && TREE_CODE (gimple_vdef (stmt)) != SSA_NAME) |
| 0 | 360 { |
| 111 | 361 fn->gimple_df->rename_vops = 1; |
| 362 fn->gimple_df->ssa_renaming_needed = 1; | |
| 0 | 363 } |
| 364 } | |
| 365 | |
| 366 | |
| 111 | 367 /* Takes elements from build_uses and turns them into use operands of STMT. */ |
| 0 | 368 |
| 369 static inline void | |
| 111 | 370 finalize_ssa_uses (struct function *fn, gimple *stmt) |
| 0 | 371 { |
| 372 unsigned new_i; | |
| 373 struct use_optype_d new_list; | |
| 374 use_optype_p old_ops, ptr, last; | |
| 375 | |
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376 /* Pre-pend the VUSE we may have built. */ |
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377 if (build_vuse != NULL_TREE) |
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378 { |
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379 tree oldvuse = gimple_vuse (stmt); |
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380 if (oldvuse |
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381 && TREE_CODE (oldvuse) == SSA_NAME) |
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382 oldvuse = SSA_NAME_VAR (oldvuse); |
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383 if (oldvuse != (build_vuse != NULL_TREE |
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384 ? build_vuse : build_vdef)) |
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385 gimple_set_vuse (stmt, NULL_TREE); |
| 111 | 386 build_uses.safe_insert (0, gimple_vuse_ptr (stmt)); |
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387 } |
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388 |
| 0 | 389 new_list.next = NULL; |
| 390 last = &new_list; | |
| 391 | |
| 392 old_ops = gimple_use_ops (stmt); | |
| 393 | |
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394 /* Clear a no longer necessary VUSE. */ |
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395 if (build_vuse == NULL_TREE |
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396 && gimple_vuse (stmt) != NULL_TREE) |
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397 gimple_set_vuse (stmt, NULL_TREE); |
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398 |
| 0 | 399 /* If there is anything in the old list, free it. */ |
| 400 if (old_ops) | |
| 401 { | |
| 111 | 402 for (ptr = old_ops; ptr->next; ptr = ptr->next) |
| 0 | 403 delink_imm_use (USE_OP_PTR (ptr)); |
| 111 | 404 delink_imm_use (USE_OP_PTR (ptr)); |
| 405 ptr->next = gimple_ssa_operands (fn)->free_uses; | |
| 406 gimple_ssa_operands (fn)->free_uses = old_ops; | |
| 0 | 407 } |
| 408 | |
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409 /* If we added a VUSE, make sure to set the operand if it is not already |
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410 present and mark it for renaming. */ |
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411 if (build_vuse != NULL_TREE |
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412 && gimple_vuse (stmt) == NULL_TREE) |
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413 { |
| 111 | 414 gimple_set_vuse (stmt, gimple_vop (fn)); |
| 415 fn->gimple_df->rename_vops = 1; | |
| 416 fn->gimple_df->ssa_renaming_needed = 1; | |
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417 } |
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418 |
| 0 | 419 /* Now create nodes for all the new nodes. */ |
| 111 | 420 for (new_i = 0; new_i < build_uses.length (); new_i++) |
| 421 { | |
| 422 tree *op = build_uses[new_i]; | |
| 423 last = add_use_op (fn, stmt, op, last); | |
| 424 } | |
| 0 | 425 |
| 426 /* Now set the stmt's operands. */ | |
| 427 gimple_set_use_ops (stmt, new_list.next); | |
| 428 } | |
| 429 | |
| 430 | |
| 431 /* Clear the in_list bits and empty the build array for VDEFs and | |
| 432 VUSEs. */ | |
| 433 | |
| 434 static inline void | |
| 435 cleanup_build_arrays (void) | |
| 436 { | |
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437 build_vdef = NULL_TREE; |
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438 build_vuse = NULL_TREE; |
| 111 | 439 build_uses.truncate (0); |
| 0 | 440 } |
| 441 | |
| 442 | |
| 443 /* Finalize all the build vectors, fill the new ones into INFO. */ | |
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444 |
| 0 | 445 static inline void |
| 111 | 446 finalize_ssa_stmt_operands (struct function *fn, gimple *stmt) |
| 0 | 447 { |
| 111 | 448 finalize_ssa_defs (fn, stmt); |
| 449 finalize_ssa_uses (fn, stmt); | |
| 0 | 450 cleanup_build_arrays (); |
| 451 } | |
| 452 | |
| 453 | |
| 454 /* Start the process of building up operands vectors in INFO. */ | |
| 455 | |
| 456 static inline void | |
| 457 start_ssa_stmt_operands (void) | |
| 458 { | |
| 111 | 459 gcc_assert (build_uses.length () == 0); |
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460 gcc_assert (build_vuse == NULL_TREE); |
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461 gcc_assert (build_vdef == NULL_TREE); |
| 0 | 462 } |
| 463 | |
| 464 | |
| 465 /* Add USE_P to the list of pointers to operands. */ | |
| 466 | |
| 467 static inline void | |
| 468 append_use (tree *use_p) | |
| 469 { | |
| 111 | 470 build_uses.safe_push (use_p); |
| 0 | 471 } |
| 472 | |
| 473 | |
| 474 /* Add VAR to the set of variables that require a VDEF operator. */ | |
| 475 | |
| 476 static inline void | |
| 477 append_vdef (tree var) | |
| 478 { | |
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479 gcc_assert ((build_vdef == NULL_TREE |
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480 || build_vdef == var) |
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481 && (build_vuse == NULL_TREE |
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482 || build_vuse == var)); |
| 0 | 483 |
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484 build_vdef = var; |
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485 build_vuse = var; |
| 0 | 486 } |
| 487 | |
| 488 | |
| 489 /* Add VAR to the set of variables that require a VUSE operator. */ | |
| 490 | |
| 491 static inline void | |
| 492 append_vuse (tree var) | |
| 493 { | |
|
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494 gcc_assert (build_vuse == NULL_TREE |
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495 || build_vuse == var); |
| 0 | 496 |
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497 build_vuse = var; |
| 0 | 498 } |
| 499 | |
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500 /* Add virtual operands for STMT. FLAGS is as in get_expr_operands. */ |
| 0 | 501 |
| 502 static void | |
| 111 | 503 add_virtual_operand (struct function *fn, |
| 504 gimple *stmt ATTRIBUTE_UNUSED, int flags) | |
| 0 | 505 { |
|
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506 /* Add virtual operands to the stmt, unless the caller has specifically |
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507 requested not to do that (used when adding operands inside an |
| 0 | 508 ADDR_EXPR expression). */ |
| 509 if (flags & opf_no_vops) | |
| 510 return; | |
| 511 | |
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512 gcc_assert (!is_gimple_debug (stmt)); |
| 0 | 513 |
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514 if (flags & opf_def) |
| 111 | 515 append_vdef (gimple_vop (fn)); |
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516 else |
| 111 | 517 append_vuse (gimple_vop (fn)); |
| 0 | 518 } |
| 519 | |
| 520 | |
| 521 /* Add *VAR_P to the appropriate operand array for statement STMT. | |
| 522 FLAGS is as in get_expr_operands. If *VAR_P is a GIMPLE register, | |
| 523 it will be added to the statement's real operands, otherwise it is | |
| 524 added to virtual operands. */ | |
| 525 | |
| 526 static void | |
| 111 | 527 add_stmt_operand (struct function *fn, tree *var_p, gimple *stmt, int flags) |
| 0 | 528 { |
| 111 | 529 tree var = *var_p; |
| 0 | 530 |
| 531 gcc_assert (SSA_VAR_P (*var_p)); | |
| 532 | |
| 111 | 533 if (is_gimple_reg (var)) |
| 0 | 534 { |
| 535 /* The variable is a GIMPLE register. Add it to real operands. */ | |
| 536 if (flags & opf_def) | |
| 111 | 537 ; |
| 0 | 538 else |
| 539 append_use (var_p); | |
| 111 | 540 if (DECL_P (*var_p)) |
| 541 fn->gimple_df->ssa_renaming_needed = 1; | |
| 0 | 542 } |
| 543 else | |
| 111 | 544 { |
| 545 /* Mark statements with volatile operands. */ | |
| 546 if (!(flags & opf_no_vops) | |
| 547 && TREE_THIS_VOLATILE (var)) | |
| 548 gimple_set_has_volatile_ops (stmt, true); | |
| 549 | |
| 550 /* The variable is a memory access. Add virtual operands. */ | |
| 551 add_virtual_operand (fn, stmt, flags); | |
| 552 } | |
| 0 | 553 } |
| 554 | |
|
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555 /* Mark the base address of REF as having its address taken. |
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556 REF may be a single variable whose address has been taken or any |
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557 other valid GIMPLE memory reference (structure reference, array, |
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558 etc). */ |
| 0 | 559 |
| 560 static void | |
|
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561 mark_address_taken (tree ref) |
| 0 | 562 { |
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563 tree var; |
| 0 | 564 |
|
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565 /* Note that it is *NOT OKAY* to use the target of a COMPONENT_REF |
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566 as the only thing we take the address of. If VAR is a structure, |
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567 taking the address of a field means that the whole structure may |
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568 be referenced using pointer arithmetic. See PR 21407 and the |
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569 ensuing mailing list discussion. */ |
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570 var = get_base_address (ref); |
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571 if (var) |
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572 { |
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573 if (DECL_P (var)) |
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574 TREE_ADDRESSABLE (var) = 1; |
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575 else if (TREE_CODE (var) == MEM_REF |
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576 && TREE_CODE (TREE_OPERAND (var, 0)) == ADDR_EXPR |
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577 && DECL_P (TREE_OPERAND (TREE_OPERAND (var, 0), 0))) |
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578 TREE_ADDRESSABLE (TREE_OPERAND (TREE_OPERAND (var, 0), 0)) = 1; |
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579 } |
| 0 | 580 } |
| 581 | |
| 582 | |
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583 /* A subroutine of get_expr_operands to handle MEM_REF. |
| 0 | 584 |
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585 STMT is the statement being processed, EXPR is the MEM_REF |
| 0 | 586 that got us here. |
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587 |
| 111 | 588 FLAGS is as in get_expr_operands. */ |
| 0 | 589 |
| 590 static void | |
| 111 | 591 get_mem_ref_operands (struct function *fn, |
| 592 gimple *stmt, tree expr, int flags) | |
| 0 | 593 { |
| 594 tree *pptr = &TREE_OPERAND (expr, 0); | |
| 595 | |
| 111 | 596 if (!(flags & opf_no_vops) |
| 597 && TREE_THIS_VOLATILE (expr)) | |
| 0 | 598 gimple_set_has_volatile_ops (stmt, true); |
| 599 | |
|
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600 /* Add the VOP. */ |
| 111 | 601 add_virtual_operand (fn, stmt, flags); |
|
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602 |
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603 /* If requested, add a USE operand for the base pointer. */ |
| 111 | 604 get_expr_operands (fn, stmt, pptr, |
| 605 opf_non_addressable | opf_use | |
| 606 | (flags & (opf_no_vops|opf_not_non_addressable))); | |
| 0 | 607 } |
| 608 | |
| 609 | |
| 610 /* A subroutine of get_expr_operands to handle TARGET_MEM_REF. */ | |
| 611 | |
| 612 static void | |
| 111 | 613 get_tmr_operands (struct function *fn, gimple *stmt, tree expr, int flags) |
| 0 | 614 { |
| 111 | 615 if (!(flags & opf_no_vops) |
| 616 && TREE_THIS_VOLATILE (expr)) | |
|
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617 gimple_set_has_volatile_ops (stmt, true); |
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618 |
| 0 | 619 /* First record the real operands. */ |
| 111 | 620 get_expr_operands (fn, stmt, |
| 621 &TMR_BASE (expr), opf_use | (flags & opf_no_vops)); | |
| 622 get_expr_operands (fn, stmt, | |
| 623 &TMR_INDEX (expr), opf_use | (flags & opf_no_vops)); | |
| 624 get_expr_operands (fn, stmt, | |
| 625 &TMR_INDEX2 (expr), opf_use | (flags & opf_no_vops)); | |
| 0 | 626 |
| 111 | 627 add_virtual_operand (fn, stmt, flags); |
| 0 | 628 } |
| 629 | |
| 630 | |
| 631 /* If STMT is a call that may clobber globals and other symbols that | |
| 632 escape, add them to the VDEF/VUSE lists for it. */ | |
| 633 | |
| 634 static void | |
| 111 | 635 maybe_add_call_vops (struct function *fn, gcall *stmt) |
| 0 | 636 { |
| 637 int call_flags = gimple_call_flags (stmt); | |
| 638 | |
| 639 /* If aliases have been computed already, add VDEF or VUSE | |
| 640 operands for all the symbols that have been found to be | |
| 641 call-clobbered. */ | |
|
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642 if (!(call_flags & ECF_NOVOPS)) |
| 0 | 643 { |
| 111 | 644 /* A 'pure' or a 'const' function never call-clobbers anything. */ |
| 645 if (!(call_flags & (ECF_PURE | ECF_CONST))) | |
| 646 add_virtual_operand (fn, stmt, opf_def); | |
| 0 | 647 else if (!(call_flags & ECF_CONST)) |
| 111 | 648 add_virtual_operand (fn, stmt, opf_use); |
| 0 | 649 } |
| 650 } | |
| 651 | |
| 652 | |
| 653 /* Scan operands in the ASM_EXPR stmt referred to in INFO. */ | |
| 654 | |
| 655 static void | |
| 111 | 656 get_asm_stmt_operands (struct function *fn, gasm *stmt) |
| 0 | 657 { |
| 658 size_t i, noutputs; | |
| 659 const char **oconstraints; | |
| 660 const char *constraint; | |
| 661 bool allows_mem, allows_reg, is_inout; | |
| 662 | |
| 663 noutputs = gimple_asm_noutputs (stmt); | |
| 664 oconstraints = (const char **) alloca ((noutputs) * sizeof (const char *)); | |
| 665 | |
| 666 /* Gather all output operands. */ | |
| 667 for (i = 0; i < gimple_asm_noutputs (stmt); i++) | |
| 668 { | |
| 669 tree link = gimple_asm_output_op (stmt, i); | |
| 670 constraint = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link))); | |
| 671 oconstraints[i] = constraint; | |
| 672 parse_output_constraint (&constraint, i, 0, 0, &allows_mem, | |
| 673 &allows_reg, &is_inout); | |
| 674 | |
| 675 /* This should have been split in gimplify_asm_expr. */ | |
| 676 gcc_assert (!allows_reg || !is_inout); | |
| 677 | |
| 678 /* Memory operands are addressable. Note that STMT needs the | |
| 679 address of this operand. */ | |
| 680 if (!allows_reg && allows_mem) | |
|
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681 mark_address_taken (TREE_VALUE (link)); |
| 0 | 682 |
| 111 | 683 get_expr_operands (fn, stmt, |
| 684 &TREE_VALUE (link), opf_def | opf_not_non_addressable); | |
| 0 | 685 } |
| 686 | |
| 687 /* Gather all input operands. */ | |
| 688 for (i = 0; i < gimple_asm_ninputs (stmt); i++) | |
| 689 { | |
| 690 tree link = gimple_asm_input_op (stmt, i); | |
| 691 constraint = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link))); | |
| 692 parse_input_constraint (&constraint, 0, 0, noutputs, 0, oconstraints, | |
| 693 &allows_mem, &allows_reg); | |
| 694 | |
| 695 /* Memory operands are addressable. Note that STMT needs the | |
| 696 address of this operand. */ | |
| 697 if (!allows_reg && allows_mem) | |
|
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698 mark_address_taken (TREE_VALUE (link)); |
| 0 | 699 |
| 111 | 700 get_expr_operands (fn, stmt, &TREE_VALUE (link), opf_not_non_addressable); |
| 0 | 701 } |
| 702 | |
| 703 /* Clobber all memory and addressable symbols for asm ("" : : : "memory"); */ | |
| 111 | 704 if (gimple_asm_clobbers_memory_p (stmt)) |
| 705 add_virtual_operand (fn, stmt, opf_def); | |
| 0 | 706 } |
| 707 | |
| 708 | |
| 709 /* Recursively scan the expression pointed to by EXPR_P in statement | |
| 710 STMT. FLAGS is one of the OPF_* constants modifying how to | |
| 711 interpret the operands found. */ | |
| 712 | |
| 713 static void | |
| 111 | 714 get_expr_operands (struct function *fn, gimple *stmt, tree *expr_p, int flags) |
| 0 | 715 { |
| 716 enum tree_code code; | |
| 717 enum tree_code_class codeclass; | |
| 718 tree expr = *expr_p; | |
|
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719 int uflags = opf_use; |
| 0 | 720 |
| 721 if (expr == NULL) | |
| 722 return; | |
| 723 | |
|
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724 if (is_gimple_debug (stmt)) |
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725 uflags |= (flags & opf_no_vops); |
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726 |
| 0 | 727 code = TREE_CODE (expr); |
| 728 codeclass = TREE_CODE_CLASS (code); | |
| 729 | |
| 730 switch (code) | |
| 731 { | |
| 732 case ADDR_EXPR: | |
| 733 /* Taking the address of a variable does not represent a | |
| 734 reference to it, but the fact that the statement takes its | |
| 735 address will be of interest to some passes (e.g. alias | |
| 736 resolution). */ | |
|
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737 if ((!(flags & opf_non_addressable) |
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738 || (flags & opf_not_non_addressable)) |
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739 && !is_gimple_debug (stmt)) |
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740 mark_address_taken (TREE_OPERAND (expr, 0)); |
| 0 | 741 |
| 742 /* Otherwise, there may be variables referenced inside but there | |
| 743 should be no VUSEs created, since the referenced objects are | |
| 744 not really accessed. The only operands that we should find | |
| 745 here are ARRAY_REF indices which will always be real operands | |
| 746 (GIMPLE does not allow non-registers as array indices). */ | |
| 747 flags |= opf_no_vops; | |
| 111 | 748 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 0), |
| 749 flags | opf_not_non_addressable | opf_address_taken); | |
| 0 | 750 return; |
| 751 | |
| 752 case SSA_NAME: | |
| 753 case VAR_DECL: | |
| 754 case PARM_DECL: | |
| 755 case RESULT_DECL: | |
| 111 | 756 if (!(flags & opf_address_taken)) |
| 757 add_stmt_operand (fn, expr_p, stmt, flags); | |
| 0 | 758 return; |
| 759 | |
|
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760 case DEBUG_EXPR_DECL: |
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761 gcc_assert (gimple_debug_bind_p (stmt)); |
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762 return; |
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763 |
|
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|
764 case MEM_REF: |
| 111 | 765 get_mem_ref_operands (fn, stmt, expr, flags); |
| 0 | 766 return; |
| 767 | |
| 768 case TARGET_MEM_REF: | |
| 111 | 769 get_tmr_operands (fn, stmt, expr, flags); |
| 0 | 770 return; |
| 771 | |
| 772 case ARRAY_REF: | |
| 773 case ARRAY_RANGE_REF: | |
| 774 case COMPONENT_REF: | |
| 775 case REALPART_EXPR: | |
| 776 case IMAGPART_EXPR: | |
| 777 { | |
| 111 | 778 if (!(flags & opf_no_vops) |
| 779 && TREE_THIS_VOLATILE (expr)) | |
| 0 | 780 gimple_set_has_volatile_ops (stmt, true); |
| 781 | |
| 111 | 782 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 0), flags); |
| 0 | 783 |
| 784 if (code == COMPONENT_REF) | |
| 785 { | |
| 111 | 786 if (!(flags & opf_no_vops) |
| 787 && TREE_THIS_VOLATILE (TREE_OPERAND (expr, 1))) | |
| 0 | 788 gimple_set_has_volatile_ops (stmt, true); |
| 111 | 789 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 2), uflags); |
| 0 | 790 } |
| 791 else if (code == ARRAY_REF || code == ARRAY_RANGE_REF) | |
| 792 { | |
| 111 | 793 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 1), uflags); |
| 794 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 2), uflags); | |
| 795 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 3), uflags); | |
| 0 | 796 } |
| 797 | |
| 798 return; | |
| 799 } | |
| 800 | |
| 801 case WITH_SIZE_EXPR: | |
| 802 /* WITH_SIZE_EXPR is a pass-through reference to its first argument, | |
| 803 and an rvalue reference to its second argument. */ | |
| 111 | 804 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 1), uflags); |
| 805 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 0), flags); | |
| 0 | 806 return; |
| 807 | |
| 808 case COND_EXPR: | |
| 809 case VEC_COND_EXPR: | |
| 111 | 810 case VEC_PERM_EXPR: |
| 811 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 0), uflags); | |
| 812 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 1), uflags); | |
| 813 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 2), uflags); | |
| 0 | 814 return; |
| 815 | |
| 816 case CONSTRUCTOR: | |
| 817 { | |
| 818 /* General aggregate CONSTRUCTORs have been decomposed, but they | |
| 819 are still in use as the COMPLEX_EXPR equivalent for vectors. */ | |
| 820 constructor_elt *ce; | |
| 821 unsigned HOST_WIDE_INT idx; | |
| 822 | |
| 111 | 823 /* A volatile constructor is actually TREE_CLOBBER_P, transfer |
| 824 the volatility to the statement, don't use TREE_CLOBBER_P for | |
| 825 mirroring the other uses of THIS_VOLATILE in this file. */ | |
| 826 if (!(flags & opf_no_vops) | |
| 827 && TREE_THIS_VOLATILE (expr)) | |
| 828 gimple_set_has_volatile_ops (stmt, true); | |
| 829 | |
| 0 | 830 for (idx = 0; |
| 111 | 831 vec_safe_iterate (CONSTRUCTOR_ELTS (expr), idx, &ce); |
| 0 | 832 idx++) |
| 111 | 833 get_expr_operands (fn, stmt, &ce->value, uflags); |
| 0 | 834 |
| 835 return; | |
| 836 } | |
| 837 | |
| 838 case BIT_FIELD_REF: | |
| 111 | 839 if (!(flags & opf_no_vops) |
| 840 && TREE_THIS_VOLATILE (expr)) | |
| 0 | 841 gimple_set_has_volatile_ops (stmt, true); |
| 842 /* FALLTHRU */ | |
| 843 | |
| 844 case VIEW_CONVERT_EXPR: | |
| 845 do_unary: | |
| 111 | 846 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 0), flags); |
| 0 | 847 return; |
| 848 | |
| 111 | 849 case BIT_INSERT_EXPR: |
| 0 | 850 case COMPOUND_EXPR: |
| 851 case OBJ_TYPE_REF: | |
| 852 case ASSERT_EXPR: | |
| 853 do_binary: | |
| 854 { | |
| 111 | 855 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 0), flags); |
| 856 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 1), flags); | |
| 0 | 857 return; |
| 858 } | |
| 859 | |
| 860 case DOT_PROD_EXPR: | |
| 111 | 861 case SAD_EXPR: |
| 0 | 862 case REALIGN_LOAD_EXPR: |
|
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863 case WIDEN_MULT_PLUS_EXPR: |
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864 case WIDEN_MULT_MINUS_EXPR: |
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|
865 case FMA_EXPR: |
| 0 | 866 { |
| 111 | 867 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 0), flags); |
| 868 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 1), flags); | |
| 869 get_expr_operands (fn, stmt, &TREE_OPERAND (expr, 2), flags); | |
|
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|
870 return; |
| 0 | 871 } |
| 872 | |
| 873 case FUNCTION_DECL: | |
| 874 case LABEL_DECL: | |
| 875 case CONST_DECL: | |
| 876 case CASE_LABEL_EXPR: | |
| 877 /* Expressions that make no memory references. */ | |
| 878 return; | |
| 879 | |
| 880 default: | |
| 881 if (codeclass == tcc_unary) | |
| 882 goto do_unary; | |
| 883 if (codeclass == tcc_binary || codeclass == tcc_comparison) | |
| 884 goto do_binary; | |
| 885 if (codeclass == tcc_constant || codeclass == tcc_type) | |
| 886 return; | |
| 887 } | |
| 888 | |
| 889 /* If we get here, something has gone wrong. */ | |
| 111 | 890 if (flag_checking) |
| 891 { | |
| 892 fprintf (stderr, "unhandled expression in get_expr_operands():\n"); | |
| 893 debug_tree (expr); | |
| 894 fputs ("\n", stderr); | |
| 895 gcc_unreachable (); | |
| 896 } | |
| 0 | 897 } |
| 898 | |
| 899 | |
| 900 /* Parse STMT looking for operands. When finished, the various | |
| 901 build_* operand vectors will have potential operands in them. */ | |
| 902 | |
| 903 static void | |
| 111 | 904 parse_ssa_operands (struct function *fn, gimple *stmt) |
| 0 | 905 { |
| 906 enum gimple_code code = gimple_code (stmt); | |
| 111 | 907 size_t i, n, start = 0; |
| 0 | 908 |
| 111 | 909 switch (code) |
|
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910 { |
| 111 | 911 case GIMPLE_ASM: |
| 912 get_asm_stmt_operands (fn, as_a <gasm *> (stmt)); | |
| 913 break; | |
| 914 | |
| 915 case GIMPLE_TRANSACTION: | |
| 916 /* The start of a transaction is a memory barrier. */ | |
| 917 add_virtual_operand (fn, stmt, opf_def | opf_use); | |
| 918 break; | |
| 919 | |
| 920 case GIMPLE_DEBUG: | |
|
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921 if (gimple_debug_bind_p (stmt) |
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922 && gimple_debug_bind_has_value_p (stmt)) |
| 111 | 923 get_expr_operands (fn, stmt, gimple_debug_bind_get_value_ptr (stmt), |
|
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924 opf_use | opf_no_vops); |
| 111 | 925 break; |
| 926 | |
| 927 case GIMPLE_RETURN: | |
| 928 append_vuse (gimple_vop (fn)); | |
| 929 goto do_default; | |
| 0 | 930 |
| 111 | 931 case GIMPLE_CALL: |
| 932 /* Add call-clobbered operands, if needed. */ | |
| 933 maybe_add_call_vops (fn, as_a <gcall *> (stmt)); | |
| 934 /* FALLTHRU */ | |
| 0 | 935 |
| 111 | 936 case GIMPLE_ASSIGN: |
| 937 get_expr_operands (fn, stmt, gimple_op_ptr (stmt, 0), opf_def); | |
| 938 start = 1; | |
| 939 /* FALLTHRU */ | |
| 0 | 940 |
| 111 | 941 default: |
| 942 do_default: | |
| 943 n = gimple_num_ops (stmt); | |
| 944 for (i = start; i < n; i++) | |
| 945 get_expr_operands (fn, stmt, gimple_op_ptr (stmt, i), opf_use); | |
| 946 break; | |
| 0 | 947 } |
| 948 } | |
| 949 | |
| 950 | |
| 951 /* Create an operands cache for STMT. */ | |
| 952 | |
| 953 static void | |
| 111 | 954 build_ssa_operands (struct function *fn, gimple *stmt) |
| 0 | 955 { |
|
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956 /* Initially assume that the statement has no volatile operands. */ |
| 0 | 957 gimple_set_has_volatile_ops (stmt, false); |
| 958 | |
| 959 start_ssa_stmt_operands (); | |
| 111 | 960 parse_ssa_operands (fn, stmt); |
| 961 finalize_ssa_stmt_operands (fn, stmt); | |
| 962 } | |
| 963 | |
| 964 /* Verifies SSA statement operands. */ | |
| 965 | |
| 966 DEBUG_FUNCTION bool | |
| 967 verify_ssa_operands (struct function *fn, gimple *stmt) | |
| 968 { | |
| 969 use_operand_p use_p; | |
| 970 def_operand_p def_p; | |
| 971 ssa_op_iter iter; | |
| 972 unsigned i; | |
| 973 tree def; | |
| 974 bool volatile_p = gimple_has_volatile_ops (stmt); | |
| 975 | |
| 976 /* build_ssa_operands w/o finalizing them. */ | |
| 977 gimple_set_has_volatile_ops (stmt, false); | |
| 978 start_ssa_stmt_operands (); | |
| 979 parse_ssa_operands (fn, stmt); | |
| 980 | |
| 981 /* Now verify the built operands are the same as present in STMT. */ | |
| 982 def = gimple_vdef (stmt); | |
| 983 if (def | |
| 984 && TREE_CODE (def) == SSA_NAME) | |
| 985 def = SSA_NAME_VAR (def); | |
| 986 if (build_vdef != def) | |
| 987 { | |
| 988 error ("virtual definition of statement not up-to-date"); | |
| 989 return true; | |
| 990 } | |
| 991 if (gimple_vdef (stmt) | |
| 992 && ((def_p = gimple_vdef_op (stmt)) == NULL_DEF_OPERAND_P | |
| 993 || DEF_FROM_PTR (def_p) != gimple_vdef (stmt))) | |
| 994 { | |
| 995 error ("virtual def operand missing for stmt"); | |
| 996 return true; | |
| 997 } | |
| 998 | |
| 999 tree use = gimple_vuse (stmt); | |
| 1000 if (use | |
| 1001 && TREE_CODE (use) == SSA_NAME) | |
| 1002 use = SSA_NAME_VAR (use); | |
| 1003 if (build_vuse != use) | |
| 1004 { | |
| 1005 error ("virtual use of statement not up-to-date"); | |
| 1006 return true; | |
| 1007 } | |
| 1008 if (gimple_vuse (stmt) | |
| 1009 && ((use_p = gimple_vuse_op (stmt)) == NULL_USE_OPERAND_P | |
| 1010 || USE_FROM_PTR (use_p) != gimple_vuse (stmt))) | |
| 1011 { | |
| 1012 error ("virtual use operand missing for stmt"); | |
| 1013 return true; | |
| 1014 } | |
| 1015 | |
| 1016 FOR_EACH_SSA_USE_OPERAND (use_p, stmt, iter, SSA_OP_USE) | |
| 1017 { | |
| 1018 tree *op; | |
| 1019 FOR_EACH_VEC_ELT (build_uses, i, op) | |
| 1020 { | |
| 1021 if (use_p->use == op) | |
| 1022 { | |
| 1023 build_uses[i] = NULL; | |
| 1024 break; | |
| 1025 } | |
| 1026 } | |
| 1027 if (i == build_uses.length ()) | |
| 1028 { | |
| 1029 error ("excess use operand for stmt"); | |
| 1030 debug_generic_expr (USE_FROM_PTR (use_p)); | |
| 1031 return true; | |
| 1032 } | |
| 1033 } | |
| 1034 | |
| 1035 tree *op; | |
| 1036 FOR_EACH_VEC_ELT (build_uses, i, op) | |
| 1037 if (op != NULL) | |
| 1038 { | |
| 1039 error ("use operand missing for stmt"); | |
| 1040 debug_generic_expr (*op); | |
| 1041 return true; | |
| 1042 } | |
| 1043 | |
| 1044 if (gimple_has_volatile_ops (stmt) != volatile_p) | |
| 1045 { | |
| 1046 error ("stmt volatile flag not up-to-date"); | |
| 1047 return true; | |
| 1048 } | |
| 1049 | |
| 1050 cleanup_build_arrays (); | |
| 1051 return false; | |
| 0 | 1052 } |
| 1053 | |
| 1054 | |
| 1055 /* Releases the operands of STMT back to their freelists, and clears | |
| 1056 the stmt operand lists. */ | |
| 1057 | |
| 1058 void | |
| 111 | 1059 free_stmt_operands (struct function *fn, gimple *stmt) |
| 0 | 1060 { |
| 1061 use_optype_p uses = gimple_use_ops (stmt), last_use; | |
| 1062 | |
| 1063 if (uses) | |
| 1064 { | |
| 1065 for (last_use = uses; last_use->next; last_use = last_use->next) | |
| 1066 delink_imm_use (USE_OP_PTR (last_use)); | |
| 1067 delink_imm_use (USE_OP_PTR (last_use)); | |
| 111 | 1068 last_use->next = gimple_ssa_operands (fn)->free_uses; |
| 1069 gimple_ssa_operands (fn)->free_uses = uses; | |
| 0 | 1070 gimple_set_use_ops (stmt, NULL); |
| 1071 } | |
| 1072 | |
| 1073 if (gimple_has_mem_ops (stmt)) | |
| 1074 { | |
|
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|
1075 gimple_set_vuse (stmt, NULL_TREE); |
|
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|
1076 gimple_set_vdef (stmt, NULL_TREE); |
| 0 | 1077 } |
| 1078 } | |
| 1079 | |
| 1080 | |
| 1081 /* Get the operands of statement STMT. */ | |
| 1082 | |
| 1083 void | |
| 111 | 1084 update_stmt_operands (struct function *fn, gimple *stmt) |
| 0 | 1085 { |
| 1086 /* If update_stmt_operands is called before SSA is initialized, do | |
| 1087 nothing. */ | |
| 111 | 1088 if (!ssa_operands_active (fn)) |
| 0 | 1089 return; |
| 1090 | |
| 1091 timevar_push (TV_TREE_OPS); | |
| 1092 | |
| 1093 gcc_assert (gimple_modified_p (stmt)); | |
| 111 | 1094 build_ssa_operands (fn, stmt); |
| 0 | 1095 gimple_set_modified (stmt, false); |
| 1096 | |
| 1097 timevar_pop (TV_TREE_OPS); | |
| 1098 } | |
| 1099 | |
| 1100 | |
| 1101 /* Swap operands EXP0 and EXP1 in statement STMT. No attempt is done | |
| 1102 to test the validity of the swap operation. */ | |
| 1103 | |
| 1104 void | |
| 111 | 1105 swap_ssa_operands (gimple *stmt, tree *exp0, tree *exp1) |
| 0 | 1106 { |
| 1107 tree op0, op1; | |
| 1108 op0 = *exp0; | |
| 1109 op1 = *exp1; | |
| 1110 | |
| 111 | 1111 if (op0 != op1) |
| 0 | 1112 { |
| 111 | 1113 /* Attempt to preserve the relative positions of these two operands in |
| 1114 their * respective immediate use lists by adjusting their use pointer | |
| 1115 to point to the new operand position. */ | |
| 0 | 1116 use_optype_p use0, use1, ptr; |
| 1117 use0 = use1 = NULL; | |
| 1118 | |
| 1119 /* Find the 2 operands in the cache, if they are there. */ | |
| 1120 for (ptr = gimple_use_ops (stmt); ptr; ptr = ptr->next) | |
| 1121 if (USE_OP_PTR (ptr)->use == exp0) | |
| 1122 { | |
| 1123 use0 = ptr; | |
| 1124 break; | |
| 1125 } | |
| 1126 | |
| 1127 for (ptr = gimple_use_ops (stmt); ptr; ptr = ptr->next) | |
| 1128 if (USE_OP_PTR (ptr)->use == exp1) | |
| 1129 { | |
| 1130 use1 = ptr; | |
| 1131 break; | |
| 1132 } | |
| 1133 | |
| 111 | 1134 /* And adjust their location to point to the new position of the |
| 1135 operand. */ | |
| 1136 if (use0) | |
| 1137 USE_OP_PTR (use0)->use = exp1; | |
| 1138 if (use1) | |
| 1139 USE_OP_PTR (use1)->use = exp0; | |
| 1140 | |
| 1141 /* Now swap the data. */ | |
| 1142 *exp0 = op1; | |
| 1143 *exp1 = op0; | |
| 0 | 1144 } |
| 1145 } | |
| 1146 | |
| 1147 | |
| 1148 /* Scan the immediate_use list for VAR making sure its linked properly. | |
| 1149 Return TRUE if there is a problem and emit an error message to F. */ | |
| 1150 | |
|
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|
1151 DEBUG_FUNCTION bool |
| 0 | 1152 verify_imm_links (FILE *f, tree var) |
| 1153 { | |
| 1154 use_operand_p ptr, prev, list; | |
| 111 | 1155 unsigned int count; |
| 0 | 1156 |
| 1157 gcc_assert (TREE_CODE (var) == SSA_NAME); | |
| 1158 | |
| 1159 list = &(SSA_NAME_IMM_USE_NODE (var)); | |
| 1160 gcc_assert (list->use == NULL); | |
| 1161 | |
| 1162 if (list->prev == NULL) | |
| 1163 { | |
| 1164 gcc_assert (list->next == NULL); | |
| 1165 return false; | |
| 1166 } | |
| 1167 | |
| 1168 prev = list; | |
| 1169 count = 0; | |
| 1170 for (ptr = list->next; ptr != list; ) | |
| 1171 { | |
| 1172 if (prev != ptr->prev) | |
| 111 | 1173 { |
| 1174 fprintf (f, "prev != ptr->prev\n"); | |
| 1175 goto error; | |
| 1176 } | |
|
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1177 |
| 0 | 1178 if (ptr->use == NULL) |
| 111 | 1179 { |
| 1180 fprintf (f, "ptr->use == NULL\n"); | |
| 1181 goto error; /* 2 roots, or SAFE guard node. */ | |
| 1182 } | |
| 0 | 1183 else if (*(ptr->use) != var) |
| 111 | 1184 { |
| 1185 fprintf (f, "*(ptr->use) != var\n"); | |
| 1186 goto error; | |
| 1187 } | |
| 0 | 1188 |
| 1189 prev = ptr; | |
| 1190 ptr = ptr->next; | |
| 1191 | |
| 111 | 1192 count++; |
| 1193 if (count == 0) | |
| 1194 { | |
| 1195 fprintf (f, "number of immediate uses doesn't fit unsigned int\n"); | |
| 1196 goto error; | |
| 1197 } | |
| 0 | 1198 } |
| 1199 | |
| 1200 /* Verify list in the other direction. */ | |
| 1201 prev = list; | |
| 1202 for (ptr = list->prev; ptr != list; ) | |
| 1203 { | |
| 1204 if (prev != ptr->next) | |
| 111 | 1205 { |
| 1206 fprintf (f, "prev != ptr->next\n"); | |
| 1207 goto error; | |
| 1208 } | |
| 0 | 1209 prev = ptr; |
| 1210 ptr = ptr->prev; | |
| 111 | 1211 if (count == 0) |
| 1212 { | |
| 1213 fprintf (f, "count-- < 0\n"); | |
| 1214 goto error; | |
| 1215 } | |
| 1216 count--; | |
| 0 | 1217 } |
| 1218 | |
| 1219 if (count != 0) | |
| 111 | 1220 { |
| 1221 fprintf (f, "count != 0\n"); | |
| 1222 goto error; | |
| 1223 } | |
| 0 | 1224 |
| 1225 return false; | |
| 1226 | |
| 1227 error: | |
| 1228 if (ptr->loc.stmt && gimple_modified_p (ptr->loc.stmt)) | |
| 1229 { | |
| 1230 fprintf (f, " STMT MODIFIED. - <%p> ", (void *)ptr->loc.stmt); | |
| 1231 print_gimple_stmt (f, ptr->loc.stmt, 0, TDF_SLIM); | |
| 1232 } | |
|
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1233 fprintf (f, " IMM ERROR : (use_p : tree - %p:%p)", (void *)ptr, |
| 0 | 1234 (void *)ptr->use); |
| 1235 print_generic_expr (f, USE_FROM_PTR (ptr), TDF_SLIM); | |
| 111 | 1236 fprintf (f, "\n"); |
| 0 | 1237 return true; |
| 1238 } | |
| 1239 | |
| 1240 | |
| 1241 /* Dump all the immediate uses to FILE. */ | |
| 1242 | |
| 1243 void | |
| 1244 dump_immediate_uses_for (FILE *file, tree var) | |
| 1245 { | |
| 1246 imm_use_iterator iter; | |
| 1247 use_operand_p use_p; | |
| 1248 | |
| 1249 gcc_assert (var && TREE_CODE (var) == SSA_NAME); | |
| 1250 | |
| 1251 print_generic_expr (file, var, TDF_SLIM); | |
| 1252 fprintf (file, " : -->"); | |
| 1253 if (has_zero_uses (var)) | |
| 1254 fprintf (file, " no uses.\n"); | |
| 1255 else | |
| 1256 if (has_single_use (var)) | |
| 1257 fprintf (file, " single use.\n"); | |
| 1258 else | |
| 1259 fprintf (file, "%d uses.\n", num_imm_uses (var)); | |
| 1260 | |
| 1261 FOR_EACH_IMM_USE_FAST (use_p, iter, var) | |
| 1262 { | |
| 1263 if (use_p->loc.stmt == NULL && use_p->use == NULL) | |
| 1264 fprintf (file, "***end of stmt iterator marker***\n"); | |
| 1265 else | |
| 1266 if (!is_gimple_reg (USE_FROM_PTR (use_p))) | |
| 1267 print_gimple_stmt (file, USE_STMT (use_p), 0, TDF_VOPS|TDF_MEMSYMS); | |
| 1268 else | |
| 1269 print_gimple_stmt (file, USE_STMT (use_p), 0, TDF_SLIM); | |
| 1270 } | |
| 111 | 1271 fprintf (file, "\n"); |
| 0 | 1272 } |
| 1273 | |
| 1274 | |
| 1275 /* Dump all the immediate uses to FILE. */ | |
| 1276 | |
| 1277 void | |
| 1278 dump_immediate_uses (FILE *file) | |
| 1279 { | |
| 1280 tree var; | |
| 1281 unsigned int x; | |
| 1282 | |
| 1283 fprintf (file, "Immediate_uses: \n\n"); | |
| 111 | 1284 FOR_EACH_SSA_NAME (x, var, cfun) |
| 0 | 1285 { |
| 1286 dump_immediate_uses_for (file, var); | |
| 1287 } | |
| 1288 } | |
| 1289 | |
| 1290 | |
| 1291 /* Dump def-use edges on stderr. */ | |
| 1292 | |
|
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1293 DEBUG_FUNCTION void |
| 0 | 1294 debug_immediate_uses (void) |
| 1295 { | |
| 1296 dump_immediate_uses (stderr); | |
| 1297 } | |
| 1298 | |
| 1299 | |
| 1300 /* Dump def-use edges on stderr. */ | |
| 1301 | |
|
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1302 DEBUG_FUNCTION void |
| 0 | 1303 debug_immediate_uses_for (tree var) |
| 1304 { | |
| 1305 dump_immediate_uses_for (stderr, var); | |
| 1306 } | |
| 1307 | |
| 1308 | |
|
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1309 /* Unlink STMTs virtual definition from the IL by propagating its use. */ |
| 0 | 1310 |
| 1311 void | |
| 111 | 1312 unlink_stmt_vdef (gimple *stmt) |
| 0 | 1313 { |
|
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1314 use_operand_p use_p; |
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1315 imm_use_iterator iter; |
| 111 | 1316 gimple *use_stmt; |
|
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1317 tree vdef = gimple_vdef (stmt); |
| 111 | 1318 tree vuse = gimple_vuse (stmt); |
| 0 | 1319 |
|
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1320 if (!vdef |
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1321 || TREE_CODE (vdef) != SSA_NAME) |
| 0 | 1322 return; |
| 1323 | |
| 111 | 1324 FOR_EACH_IMM_USE_STMT (use_stmt, iter, vdef) |
| 0 | 1325 { |
|
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1326 FOR_EACH_IMM_USE_ON_STMT (use_p, iter) |
| 111 | 1327 SET_USE (use_p, vuse); |
| 0 | 1328 } |
| 1329 | |
| 111 | 1330 if (SSA_NAME_OCCURS_IN_ABNORMAL_PHI (vdef)) |
| 1331 SSA_NAME_OCCURS_IN_ABNORMAL_PHI (vuse) = 1; | |
| 0 | 1332 } |
| 1333 | |
| 111 | 1334 /* Return true if the var whose chain of uses starts at PTR has a |
| 1335 single nondebug use. Set USE_P and STMT to that single nondebug | |
| 1336 use, if so, or to NULL otherwise. */ | |
| 1337 bool | |
| 1338 single_imm_use_1 (const ssa_use_operand_t *head, | |
| 1339 use_operand_p *use_p, gimple **stmt) | |
| 1340 { | |
| 1341 ssa_use_operand_t *ptr, *single_use = 0; | |
| 1342 | |
| 1343 for (ptr = head->next; ptr != head; ptr = ptr->next) | |
| 1344 if (USE_STMT(ptr) && !is_gimple_debug (USE_STMT (ptr))) | |
| 1345 { | |
| 1346 if (single_use) | |
| 1347 { | |
| 1348 single_use = NULL; | |
| 1349 break; | |
| 1350 } | |
| 1351 single_use = ptr; | |
| 1352 } | |
| 1353 | |
| 1354 if (use_p) | |
| 1355 *use_p = single_use; | |
| 1356 | |
| 1357 if (stmt) | |
| 1358 *stmt = single_use ? single_use->loc.stmt : NULL; | |
| 1359 | |
| 1360 return single_use; | |
| 1361 } | |
| 1362 |