Mercurial > hg > CbC > CbC_gcc
annotate gcc/tree-ssa-operands.c @ 88:f214c1d5b862
merge 89
| author | Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> |
|---|---|
| date | Tue, 20 Dec 2011 18:53:46 +0900 |
| parents | 1b10fe6932e1 |
| children | ab0bcb71f44d |
| rev | line source |
|---|---|
| 0 | 1 /* SSA operands management for trees. |
|
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2 Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 |
| 0 | 3 Free Software Foundation, Inc. |
| 4 | |
| 5 This file is part of GCC. | |
| 6 | |
| 7 GCC is free software; you can redistribute it and/or modify | |
| 8 it under the terms of the GNU General Public License as published by | |
| 9 the Free Software Foundation; either version 3, or (at your option) | |
| 10 any later version. | |
| 11 | |
| 12 GCC is distributed in the hope that it will be useful, | |
| 13 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 15 GNU General Public License for more details. | |
| 16 | |
| 17 You should have received a copy of the GNU General Public License | |
| 18 along with GCC; see the file COPYING3. If not see | |
| 19 <http://www.gnu.org/licenses/>. */ | |
| 20 | |
| 21 #include "config.h" | |
| 22 #include "system.h" | |
| 23 #include "coretypes.h" | |
| 24 #include "tm.h" | |
| 25 #include "tree.h" | |
| 26 #include "flags.h" | |
| 27 #include "function.h" | |
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28 #include "tree-pretty-print.h" |
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29 #include "gimple-pretty-print.h" |
| 0 | 30 #include "tree-flow.h" |
| 31 #include "tree-inline.h" | |
| 32 #include "tree-pass.h" | |
| 33 #include "ggc.h" | |
| 34 #include "timevar.h" | |
| 35 #include "langhooks.h" | |
| 36 #include "ipa-reference.h" | |
| 1 | 37 #ifndef noCbC |
| 38 #include "cbc-tree.h" | |
| 39 #endif | |
| 0 | 40 |
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41 /* This file contains the code required to manage the operands cache of the |
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42 SSA optimizer. For every stmt, we maintain an operand cache in the stmt |
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43 annotation. This cache contains operands that will be of interest to |
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44 optimizers and other passes wishing to manipulate the IL. |
| 0 | 45 |
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46 The operand type are broken up into REAL and VIRTUAL operands. The real |
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47 operands are represented as pointers into the stmt's operand tree. Thus |
| 0 | 48 any manipulation of the real operands will be reflected in the actual tree. |
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49 Virtual operands are represented solely in the cache, although the base |
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50 variable for the SSA_NAME may, or may not occur in the stmt's tree. |
| 0 | 51 Manipulation of the virtual operands will not be reflected in the stmt tree. |
| 52 | |
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53 The routines in this file are concerned with creating this operand cache |
| 0 | 54 from a stmt tree. |
| 55 | |
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56 The operand tree is the parsed by the various get_* routines which look |
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57 through the stmt tree for the occurrence of operands which may be of |
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58 interest, and calls are made to the append_* routines whenever one is |
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59 found. There are 4 of these routines, each representing one of the |
| 0 | 60 4 types of operands. Defs, Uses, Virtual Uses, and Virtual May Defs. |
| 61 | |
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62 The append_* routines check for duplication, and simply keep a list of |
| 0 | 63 unique objects for each operand type in the build_* extendable vectors. |
| 64 | |
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65 Once the stmt tree is completely parsed, the finalize_ssa_operands() |
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66 routine is called, which proceeds to perform the finalization routine |
| 0 | 67 on each of the 4 operand vectors which have been built up. |
| 68 | |
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69 If the stmt had a previous operand cache, the finalization routines |
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70 attempt to match up the new operands with the old ones. If it's a perfect |
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71 match, the old vector is simply reused. If it isn't a perfect match, then |
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72 a new vector is created and the new operands are placed there. For |
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73 virtual operands, if the previous cache had SSA_NAME version of a |
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74 variable, and that same variable occurs in the same operands cache, then |
| 0 | 75 the new cache vector will also get the same SSA_NAME. |
| 76 | |
| 77 i.e., if a stmt had a VUSE of 'a_5', and 'a' occurs in the new | |
| 78 operand vector for VUSE, then the new vector will also be modified | |
| 79 such that it contains 'a_5' rather than 'a'. */ | |
| 80 | |
| 81 /* Structure storing statistics on how many call clobbers we have, and | |
| 82 how many where avoided. */ | |
| 83 | |
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84 static struct |
| 0 | 85 { |
| 86 /* Number of call-clobbered ops we attempt to add to calls in | |
| 87 add_call_clobbered_mem_symbols. */ | |
| 88 unsigned int clobbered_vars; | |
| 89 | |
| 90 /* Number of write-clobbers (VDEFs) avoided by using | |
| 91 not_written information. */ | |
| 92 unsigned int static_write_clobbers_avoided; | |
| 93 | |
| 94 /* Number of reads (VUSEs) avoided by using not_read information. */ | |
| 95 unsigned int static_read_clobbers_avoided; | |
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96 |
| 0 | 97 /* Number of write-clobbers avoided because the variable can't escape to |
| 98 this call. */ | |
| 99 unsigned int unescapable_clobbers_avoided; | |
| 100 | |
| 101 /* Number of read-only uses we attempt to add to calls in | |
| 102 add_call_read_mem_symbols. */ | |
| 103 unsigned int readonly_clobbers; | |
| 104 | |
| 105 /* Number of read-only uses we avoid using not_read information. */ | |
| 106 unsigned int static_readonly_clobbers_avoided; | |
| 107 } clobber_stats; | |
| 108 | |
| 109 | |
| 110 /* Flags to describe operand properties in helpers. */ | |
| 111 | |
| 112 /* By default, operands are loaded. */ | |
| 113 #define opf_use 0 | |
| 114 | |
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115 /* Operand is the target of an assignment expression or a |
| 0 | 116 call-clobbered variable. */ |
| 117 #define opf_def (1 << 0) | |
| 118 | |
| 119 /* No virtual operands should be created in the expression. This is used | |
| 120 when traversing ADDR_EXPR nodes which have different semantics than | |
| 121 other expressions. Inside an ADDR_EXPR node, the only operands that we | |
| 122 need to consider are indices into arrays. For instance, &a.b[i] should | |
| 123 generate a USE of 'i' but it should not generate a VUSE for 'a' nor a | |
| 124 VUSE for 'b'. */ | |
| 125 #define opf_no_vops (1 << 1) | |
| 126 | |
| 127 /* Operand is an implicit reference. This is used to distinguish | |
| 128 explicit assignments in the form of MODIFY_EXPR from | |
| 129 clobbering sites like function calls or ASM_EXPRs. */ | |
| 130 #define opf_implicit (1 << 2) | |
| 131 | |
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132 /* Operand is in a place where address-taken does not imply addressable. */ |
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133 #define opf_non_addressable (1 << 3) |
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134 |
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135 /* Operand is in a place where opf_non_addressable does not apply. */ |
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136 #define opf_not_non_addressable (1 << 4) |
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137 |
| 0 | 138 /* Array for building all the def operands. */ |
| 139 static VEC(tree,heap) *build_defs; | |
| 140 | |
| 141 /* Array for building all the use operands. */ | |
| 142 static VEC(tree,heap) *build_uses; | |
| 143 | |
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144 /* The built VDEF operand. */ |
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145 static tree build_vdef; |
| 0 | 146 |
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147 /* The built VUSE operand. */ |
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148 static tree build_vuse; |
| 0 | 149 |
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150 /* Bitmap obstack for our datastructures that needs to survive across |
| 0 | 151 compilations of multiple functions. */ |
| 152 static bitmap_obstack operands_bitmap_obstack; | |
| 153 | |
| 154 static void get_expr_operands (gimple, tree *, int); | |
| 155 | |
| 156 /* Number of functions with initialized ssa_operands. */ | |
| 157 static int n_initialized = 0; | |
| 158 | |
| 159 /* Return the DECL_UID of the base variable of T. */ | |
| 160 | |
| 161 static inline unsigned | |
| 162 get_name_decl (const_tree t) | |
| 163 { | |
| 164 if (TREE_CODE (t) != SSA_NAME) | |
| 165 return DECL_UID (t); | |
| 166 else | |
| 167 return DECL_UID (SSA_NAME_VAR (t)); | |
| 168 } | |
| 169 | |
| 170 | |
| 171 /* Return true if the SSA operands cache is active. */ | |
| 172 | |
| 173 bool | |
| 174 ssa_operands_active (void) | |
| 175 { | |
| 176 /* This function may be invoked from contexts where CFUN is NULL | |
| 177 (IPA passes), return false for now. FIXME: operands may be | |
| 178 active in each individual function, maybe this function should | |
| 179 take CFUN as a parameter. */ | |
| 180 if (cfun == NULL) | |
| 181 return false; | |
| 182 | |
| 183 return cfun->gimple_df && gimple_ssa_operands (cfun)->ops_active; | |
| 184 } | |
| 185 | |
| 186 | |
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187 /* Create the VOP variable, an artificial global variable to act as a |
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188 representative of all of the virtual operands FUD chain. */ |
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189 |
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190 static void |
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191 create_vop_var (void) |
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192 { |
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193 tree global_var; |
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194 |
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195 gcc_assert (cfun->gimple_df->vop == NULL_TREE); |
| 0 | 196 |
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197 global_var = build_decl (BUILTINS_LOCATION, VAR_DECL, |
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198 get_identifier (".MEM"), |
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199 void_type_node); |
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200 DECL_ARTIFICIAL (global_var) = 1; |
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201 TREE_READONLY (global_var) = 0; |
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202 DECL_EXTERNAL (global_var) = 1; |
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203 TREE_STATIC (global_var) = 1; |
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204 TREE_USED (global_var) = 1; |
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205 DECL_CONTEXT (global_var) = NULL_TREE; |
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206 TREE_THIS_VOLATILE (global_var) = 0; |
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207 TREE_ADDRESSABLE (global_var) = 0; |
| 0 | 208 |
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209 create_var_ann (global_var); |
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210 add_referenced_var (global_var); |
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211 cfun->gimple_df->vop = global_var; |
| 0 | 212 } |
| 213 | |
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214 /* These are the sizes of the operand memory buffer in bytes which gets |
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215 allocated each time more operands space is required. The final value is |
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216 the amount that is allocated every time after that. |
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217 In 1k we can fit 25 use operands (or 63 def operands) on a host with |
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218 8 byte pointers, that would be 10 statements each with 1 def and 2 |
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219 uses. */ |
| 0 | 220 |
| 221 #define OP_SIZE_INIT 0 | |
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222 #define OP_SIZE_1 (1024 - sizeof (void *)) |
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223 #define OP_SIZE_2 (1024 * 4 - sizeof (void *)) |
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224 #define OP_SIZE_3 (1024 * 16 - sizeof (void *)) |
| 0 | 225 |
| 226 /* Initialize the operand cache routines. */ | |
| 227 | |
| 228 void | |
| 229 init_ssa_operands (void) | |
| 230 { | |
| 231 if (!n_initialized++) | |
| 232 { | |
| 233 build_defs = VEC_alloc (tree, heap, 5); | |
| 234 build_uses = VEC_alloc (tree, heap, 10); | |
|
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235 build_vuse = NULL_TREE; |
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236 build_vdef = NULL_TREE; |
| 0 | 237 bitmap_obstack_initialize (&operands_bitmap_obstack); |
| 238 } | |
| 239 | |
| 240 gcc_assert (gimple_ssa_operands (cfun)->operand_memory == NULL); | |
| 241 gimple_ssa_operands (cfun)->operand_memory_index | |
| 242 = gimple_ssa_operands (cfun)->ssa_operand_mem_size; | |
| 243 gimple_ssa_operands (cfun)->ops_active = true; | |
| 244 memset (&clobber_stats, 0, sizeof (clobber_stats)); | |
| 245 gimple_ssa_operands (cfun)->ssa_operand_mem_size = OP_SIZE_INIT; | |
|
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246 create_vop_var (); |
| 0 | 247 } |
| 248 | |
| 249 | |
| 250 /* Dispose of anything required by the operand routines. */ | |
| 251 | |
| 252 void | |
| 253 fini_ssa_operands (void) | |
| 254 { | |
| 255 struct ssa_operand_memory_d *ptr; | |
| 256 | |
| 257 if (!--n_initialized) | |
| 258 { | |
| 259 VEC_free (tree, heap, build_defs); | |
| 260 VEC_free (tree, heap, build_uses); | |
|
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261 build_vdef = NULL_TREE; |
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262 build_vuse = NULL_TREE; |
| 0 | 263 } |
| 264 | |
| 265 gimple_ssa_operands (cfun)->free_defs = NULL; | |
| 266 gimple_ssa_operands (cfun)->free_uses = NULL; | |
| 267 | |
| 268 while ((ptr = gimple_ssa_operands (cfun)->operand_memory) != NULL) | |
| 269 { | |
| 270 gimple_ssa_operands (cfun)->operand_memory | |
| 271 = gimple_ssa_operands (cfun)->operand_memory->next; | |
| 272 ggc_free (ptr); | |
| 273 } | |
| 274 | |
| 275 gimple_ssa_operands (cfun)->ops_active = false; | |
| 276 | |
| 277 if (!n_initialized) | |
| 278 bitmap_obstack_release (&operands_bitmap_obstack); | |
| 279 | |
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280 cfun->gimple_df->vop = NULL_TREE; |
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281 |
| 0 | 282 if (dump_file && (dump_flags & TDF_STATS)) |
| 283 { | |
| 284 fprintf (dump_file, "Original clobbered vars: %d\n", | |
| 285 clobber_stats.clobbered_vars); | |
| 286 fprintf (dump_file, "Static write clobbers avoided: %d\n", | |
| 287 clobber_stats.static_write_clobbers_avoided); | |
| 288 fprintf (dump_file, "Static read clobbers avoided: %d\n", | |
| 289 clobber_stats.static_read_clobbers_avoided); | |
| 290 fprintf (dump_file, "Unescapable clobbers avoided: %d\n", | |
| 291 clobber_stats.unescapable_clobbers_avoided); | |
| 292 fprintf (dump_file, "Original read-only clobbers: %d\n", | |
| 293 clobber_stats.readonly_clobbers); | |
| 294 fprintf (dump_file, "Static read-only clobbers avoided: %d\n", | |
| 295 clobber_stats.static_readonly_clobbers_avoided); | |
| 296 } | |
| 297 } | |
| 298 | |
| 299 | |
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300 /* Return memory for an operand of size SIZE. */ |
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301 |
| 0 | 302 static inline void * |
| 303 ssa_operand_alloc (unsigned size) | |
| 304 { | |
| 305 char *ptr; | |
| 306 | |
|
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307 gcc_assert (size == sizeof (struct use_optype_d) |
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308 || size == sizeof (struct def_optype_d)); |
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309 |
| 0 | 310 if (gimple_ssa_operands (cfun)->operand_memory_index + size |
| 311 >= gimple_ssa_operands (cfun)->ssa_operand_mem_size) | |
| 312 { | |
| 313 struct ssa_operand_memory_d *ptr; | |
| 314 | |
|
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315 switch (gimple_ssa_operands (cfun)->ssa_operand_mem_size) |
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316 { |
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317 case OP_SIZE_INIT: |
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318 gimple_ssa_operands (cfun)->ssa_operand_mem_size = OP_SIZE_1; |
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319 break; |
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320 case OP_SIZE_1: |
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321 gimple_ssa_operands (cfun)->ssa_operand_mem_size = OP_SIZE_2; |
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322 break; |
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323 case OP_SIZE_2: |
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324 case OP_SIZE_3: |
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325 gimple_ssa_operands (cfun)->ssa_operand_mem_size = OP_SIZE_3; |
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326 break; |
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327 default: |
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328 gcc_unreachable (); |
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329 } |
| 0 | 330 |
|
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331 |
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332 ptr = ggc_alloc_ssa_operand_memory_d (sizeof (void *) |
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333 + gimple_ssa_operands (cfun)->ssa_operand_mem_size); |
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334 |
| 0 | 335 ptr->next = gimple_ssa_operands (cfun)->operand_memory; |
| 336 gimple_ssa_operands (cfun)->operand_memory = ptr; | |
| 337 gimple_ssa_operands (cfun)->operand_memory_index = 0; | |
| 338 } | |
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339 |
| 0 | 340 ptr = &(gimple_ssa_operands (cfun)->operand_memory |
| 341 ->mem[gimple_ssa_operands (cfun)->operand_memory_index]); | |
| 342 gimple_ssa_operands (cfun)->operand_memory_index += size; | |
| 343 return ptr; | |
| 344 } | |
| 345 | |
| 346 | |
| 347 /* Allocate a DEF operand. */ | |
| 348 | |
| 349 static inline struct def_optype_d * | |
| 350 alloc_def (void) | |
| 351 { | |
| 352 struct def_optype_d *ret; | |
| 353 if (gimple_ssa_operands (cfun)->free_defs) | |
| 354 { | |
| 355 ret = gimple_ssa_operands (cfun)->free_defs; | |
| 356 gimple_ssa_operands (cfun)->free_defs | |
| 357 = gimple_ssa_operands (cfun)->free_defs->next; | |
| 358 } | |
| 359 else | |
| 360 ret = (struct def_optype_d *) | |
| 361 ssa_operand_alloc (sizeof (struct def_optype_d)); | |
| 362 return ret; | |
| 363 } | |
| 364 | |
| 365 | |
| 366 /* Allocate a USE operand. */ | |
| 367 | |
| 368 static inline struct use_optype_d * | |
| 369 alloc_use (void) | |
| 370 { | |
| 371 struct use_optype_d *ret; | |
| 372 if (gimple_ssa_operands (cfun)->free_uses) | |
| 373 { | |
| 374 ret = gimple_ssa_operands (cfun)->free_uses; | |
| 375 gimple_ssa_operands (cfun)->free_uses | |
| 376 = gimple_ssa_operands (cfun)->free_uses->next; | |
| 377 } | |
| 378 else | |
| 379 ret = (struct use_optype_d *) | |
| 380 ssa_operand_alloc (sizeof (struct use_optype_d)); | |
| 381 return ret; | |
| 382 } | |
| 383 | |
| 384 | |
| 385 /* Adds OP to the list of defs after LAST. */ | |
| 386 | |
|
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387 static inline def_optype_p |
| 0 | 388 add_def_op (tree *op, def_optype_p last) |
| 389 { | |
| 390 def_optype_p new_def; | |
| 391 | |
| 392 new_def = alloc_def (); | |
| 393 DEF_OP_PTR (new_def) = op; | |
| 394 last->next = new_def; | |
| 395 new_def->next = NULL; | |
| 396 return new_def; | |
| 397 } | |
| 398 | |
| 399 | |
| 400 /* Adds OP to the list of uses of statement STMT after LAST. */ | |
| 401 | |
| 402 static inline use_optype_p | |
| 403 add_use_op (gimple stmt, tree *op, use_optype_p last) | |
| 404 { | |
| 405 use_optype_p new_use; | |
| 406 | |
| 407 new_use = alloc_use (); | |
| 408 USE_OP_PTR (new_use)->use = op; | |
| 409 link_imm_use_stmt (USE_OP_PTR (new_use), *op, stmt); | |
| 410 last->next = new_use; | |
| 411 new_use->next = NULL; | |
| 412 return new_use; | |
| 413 } | |
| 414 | |
| 415 | |
| 416 | |
| 417 /* Takes elements from build_defs and turns them into def operands of STMT. | |
| 418 TODO -- Make build_defs VEC of tree *. */ | |
| 419 | |
| 420 static inline void | |
| 421 finalize_ssa_defs (gimple stmt) | |
| 422 { | |
| 423 unsigned new_i; | |
| 424 struct def_optype_d new_list; | |
| 425 def_optype_p old_ops, last; | |
| 426 unsigned int num = VEC_length (tree, build_defs); | |
| 427 | |
| 428 /* There should only be a single real definition per assignment. */ | |
| 429 gcc_assert ((stmt && gimple_code (stmt) != GIMPLE_ASSIGN) || num <= 1); | |
| 430 | |
|
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431 /* Pre-pend the vdef we may have built. */ |
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432 if (build_vdef != NULL_TREE) |
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433 { |
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434 tree oldvdef = gimple_vdef (stmt); |
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435 if (oldvdef |
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436 && TREE_CODE (oldvdef) == SSA_NAME) |
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437 oldvdef = SSA_NAME_VAR (oldvdef); |
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438 if (oldvdef != build_vdef) |
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439 gimple_set_vdef (stmt, build_vdef); |
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440 VEC_safe_insert (tree, heap, build_defs, 0, (tree)gimple_vdef_ptr (stmt)); |
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441 ++num; |
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442 } |
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443 |
| 0 | 444 new_list.next = NULL; |
| 445 last = &new_list; | |
| 446 | |
| 447 old_ops = gimple_def_ops (stmt); | |
| 448 | |
| 449 new_i = 0; | |
| 450 | |
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451 /* Clear and unlink a no longer necessary VDEF. */ |
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452 if (build_vdef == NULL_TREE |
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453 && gimple_vdef (stmt) != NULL_TREE) |
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454 { |
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455 if (TREE_CODE (gimple_vdef (stmt)) == SSA_NAME) |
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456 { |
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457 unlink_stmt_vdef (stmt); |
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458 release_ssa_name (gimple_vdef (stmt)); |
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459 } |
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460 gimple_set_vdef (stmt, NULL_TREE); |
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461 } |
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462 |
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463 /* If we have a non-SSA_NAME VDEF, mark it for renaming. */ |
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464 if (gimple_vdef (stmt) |
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465 && TREE_CODE (gimple_vdef (stmt)) != SSA_NAME) |
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466 mark_sym_for_renaming (gimple_vdef (stmt)); |
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467 |
| 0 | 468 /* Check for the common case of 1 def that hasn't changed. */ |
| 469 if (old_ops && old_ops->next == NULL && num == 1 | |
| 470 && (tree *) VEC_index (tree, build_defs, 0) == DEF_OP_PTR (old_ops)) | |
| 471 return; | |
| 472 | |
| 473 /* If there is anything in the old list, free it. */ | |
| 474 if (old_ops) | |
| 475 { | |
| 476 old_ops->next = gimple_ssa_operands (cfun)->free_defs; | |
| 477 gimple_ssa_operands (cfun)->free_defs = old_ops; | |
| 478 } | |
| 479 | |
| 480 /* If there is anything remaining in the build_defs list, simply emit it. */ | |
| 481 for ( ; new_i < num; new_i++) | |
| 482 last = add_def_op ((tree *) VEC_index (tree, build_defs, new_i), last); | |
| 483 | |
| 484 /* Now set the stmt's operands. */ | |
| 485 gimple_set_def_ops (stmt, new_list.next); | |
| 486 } | |
| 487 | |
| 488 | |
| 489 /* Takes elements from build_uses and turns them into use operands of STMT. | |
| 490 TODO -- Make build_uses VEC of tree *. */ | |
| 491 | |
| 492 static inline void | |
| 493 finalize_ssa_uses (gimple stmt) | |
| 494 { | |
| 495 unsigned new_i; | |
| 496 struct use_optype_d new_list; | |
| 497 use_optype_p old_ops, ptr, last; | |
| 498 | |
|
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499 /* Pre-pend the VUSE we may have built. */ |
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500 if (build_vuse != NULL_TREE) |
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501 { |
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502 tree oldvuse = gimple_vuse (stmt); |
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503 if (oldvuse |
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504 && TREE_CODE (oldvuse) == SSA_NAME) |
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505 oldvuse = SSA_NAME_VAR (oldvuse); |
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506 if (oldvuse != (build_vuse != NULL_TREE |
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507 ? build_vuse : build_vdef)) |
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508 gimple_set_vuse (stmt, NULL_TREE); |
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509 VEC_safe_insert (tree, heap, build_uses, 0, (tree)gimple_vuse_ptr (stmt)); |
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510 } |
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511 |
| 0 | 512 new_list.next = NULL; |
| 513 last = &new_list; | |
| 514 | |
| 515 old_ops = gimple_use_ops (stmt); | |
| 516 | |
|
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517 /* Clear a no longer necessary VUSE. */ |
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518 if (build_vuse == NULL_TREE |
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519 && gimple_vuse (stmt) != NULL_TREE) |
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520 gimple_set_vuse (stmt, NULL_TREE); |
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521 |
| 0 | 522 /* If there is anything in the old list, free it. */ |
| 523 if (old_ops) | |
| 524 { | |
| 525 for (ptr = old_ops; ptr; ptr = ptr->next) | |
| 526 delink_imm_use (USE_OP_PTR (ptr)); | |
| 527 old_ops->next = gimple_ssa_operands (cfun)->free_uses; | |
| 528 gimple_ssa_operands (cfun)->free_uses = old_ops; | |
| 529 } | |
| 530 | |
|
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531 /* If we added a VUSE, make sure to set the operand if it is not already |
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532 present and mark it for renaming. */ |
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533 if (build_vuse != NULL_TREE |
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534 && gimple_vuse (stmt) == NULL_TREE) |
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535 { |
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536 gimple_set_vuse (stmt, gimple_vop (cfun)); |
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537 mark_sym_for_renaming (gimple_vop (cfun)); |
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538 } |
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539 |
| 0 | 540 /* Now create nodes for all the new nodes. */ |
| 541 for (new_i = 0; new_i < VEC_length (tree, build_uses); new_i++) | |
|
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542 last = add_use_op (stmt, |
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543 (tree *) VEC_index (tree, build_uses, new_i), |
| 0 | 544 last); |
| 545 | |
| 546 /* Now set the stmt's operands. */ | |
| 547 gimple_set_use_ops (stmt, new_list.next); | |
| 548 } | |
| 549 | |
| 550 | |
| 551 /* Clear the in_list bits and empty the build array for VDEFs and | |
| 552 VUSEs. */ | |
| 553 | |
| 554 static inline void | |
| 555 cleanup_build_arrays (void) | |
| 556 { | |
|
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557 build_vdef = NULL_TREE; |
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558 build_vuse = NULL_TREE; |
| 0 | 559 VEC_truncate (tree, build_defs, 0); |
| 560 VEC_truncate (tree, build_uses, 0); | |
| 561 } | |
| 562 | |
| 563 | |
| 564 /* Finalize all the build vectors, fill the new ones into INFO. */ | |
|
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565 |
| 0 | 566 static inline void |
| 567 finalize_ssa_stmt_operands (gimple stmt) | |
| 568 { | |
| 569 finalize_ssa_defs (stmt); | |
| 570 finalize_ssa_uses (stmt); | |
| 571 cleanup_build_arrays (); | |
| 572 } | |
| 573 | |
| 574 | |
| 575 /* Start the process of building up operands vectors in INFO. */ | |
| 576 | |
| 577 static inline void | |
| 578 start_ssa_stmt_operands (void) | |
| 579 { | |
| 580 gcc_assert (VEC_length (tree, build_defs) == 0); | |
| 581 gcc_assert (VEC_length (tree, build_uses) == 0); | |
|
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582 gcc_assert (build_vuse == NULL_TREE); |
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583 gcc_assert (build_vdef == NULL_TREE); |
| 0 | 584 } |
| 585 | |
| 586 | |
| 587 /* Add DEF_P to the list of pointers to operands. */ | |
| 588 | |
| 589 static inline void | |
| 590 append_def (tree *def_p) | |
| 591 { | |
| 592 VEC_safe_push (tree, heap, build_defs, (tree) def_p); | |
| 593 } | |
| 594 | |
| 595 | |
| 596 /* Add USE_P to the list of pointers to operands. */ | |
| 597 | |
| 598 static inline void | |
| 599 append_use (tree *use_p) | |
| 600 { | |
| 601 VEC_safe_push (tree, heap, build_uses, (tree) use_p); | |
| 602 } | |
| 603 | |
| 604 | |
| 605 /* Add VAR to the set of variables that require a VDEF operator. */ | |
| 606 | |
| 607 static inline void | |
| 608 append_vdef (tree var) | |
| 609 { | |
|
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610 if (!optimize) |
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611 return; |
| 0 | 612 |
|
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613 gcc_assert ((build_vdef == NULL_TREE |
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614 || build_vdef == var) |
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615 && (build_vuse == NULL_TREE |
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616 || build_vuse == var)); |
| 0 | 617 |
|
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618 build_vdef = var; |
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619 build_vuse = var; |
| 0 | 620 } |
| 621 | |
| 622 | |
| 623 /* Add VAR to the set of variables that require a VUSE operator. */ | |
| 624 | |
| 625 static inline void | |
| 626 append_vuse (tree var) | |
| 627 { | |
|
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628 if (!optimize) |
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629 return; |
| 0 | 630 |
|
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631 gcc_assert (build_vuse == NULL_TREE |
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632 || build_vuse == var); |
| 0 | 633 |
|
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634 build_vuse = var; |
| 0 | 635 } |
| 636 | |
|
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637 /* Add virtual operands for STMT. FLAGS is as in get_expr_operands. */ |
| 0 | 638 |
| 639 static void | |
|
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640 add_virtual_operand (gimple stmt ATTRIBUTE_UNUSED, int flags) |
| 0 | 641 { |
|
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642 /* Add virtual operands to the stmt, unless the caller has specifically |
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643 requested not to do that (used when adding operands inside an |
| 0 | 644 ADDR_EXPR expression). */ |
| 645 if (flags & opf_no_vops) | |
| 646 return; | |
| 647 | |
|
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648 gcc_assert (!is_gimple_debug (stmt)); |
| 0 | 649 |
|
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650 if (flags & opf_def) |
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651 append_vdef (gimple_vop (cfun)); |
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652 else |
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653 append_vuse (gimple_vop (cfun)); |
| 0 | 654 } |
| 655 | |
| 656 | |
| 657 /* Add *VAR_P to the appropriate operand array for statement STMT. | |
| 658 FLAGS is as in get_expr_operands. If *VAR_P is a GIMPLE register, | |
| 659 it will be added to the statement's real operands, otherwise it is | |
| 660 added to virtual operands. */ | |
| 661 | |
| 662 static void | |
| 663 add_stmt_operand (tree *var_p, gimple stmt, int flags) | |
| 664 { | |
| 665 tree var, sym; | |
| 666 | |
| 667 gcc_assert (SSA_VAR_P (*var_p)); | |
| 668 | |
| 669 var = *var_p; | |
| 670 sym = (TREE_CODE (var) == SSA_NAME ? SSA_NAME_VAR (var) : var); | |
| 671 | |
| 672 /* Mark statements with volatile operands. */ | |
| 673 if (TREE_THIS_VOLATILE (sym)) | |
| 674 gimple_set_has_volatile_ops (stmt, true); | |
| 675 | |
| 676 if (is_gimple_reg (sym)) | |
| 677 { | |
| 678 /* The variable is a GIMPLE register. Add it to real operands. */ | |
| 679 if (flags & opf_def) | |
| 680 append_def (var_p); | |
| 681 else | |
| 682 append_use (var_p); | |
| 683 } | |
| 684 else | |
|
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685 add_virtual_operand (stmt, flags); |
| 0 | 686 } |
| 687 | |
|
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688 /* Mark the base address of REF as having its address taken. |
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689 REF may be a single variable whose address has been taken or any |
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690 other valid GIMPLE memory reference (structure reference, array, |
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691 etc). */ |
| 0 | 692 |
| 693 static void | |
|
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694 mark_address_taken (tree ref) |
| 0 | 695 { |
|
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696 tree var; |
| 0 | 697 |
|
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698 /* Note that it is *NOT OKAY* to use the target of a COMPONENT_REF |
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699 as the only thing we take the address of. If VAR is a structure, |
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700 taking the address of a field means that the whole structure may |
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701 be referenced using pointer arithmetic. See PR 21407 and the |
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702 ensuing mailing list discussion. */ |
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703 var = get_base_address (ref); |
|
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704 if (var) |
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705 { |
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706 if (DECL_P (var)) |
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707 TREE_ADDRESSABLE (var) = 1; |
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708 else if (TREE_CODE (var) == MEM_REF |
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709 && TREE_CODE (TREE_OPERAND (var, 0)) == ADDR_EXPR |
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710 && DECL_P (TREE_OPERAND (TREE_OPERAND (var, 0), 0))) |
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711 TREE_ADDRESSABLE (TREE_OPERAND (TREE_OPERAND (var, 0), 0)) = 1; |
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712 } |
| 0 | 713 } |
| 714 | |
| 715 | |
|
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716 /* A subroutine of get_expr_operands to handle MEM_REF. |
| 0 | 717 |
|
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718 STMT is the statement being processed, EXPR is the MEM_REF |
| 0 | 719 that got us here. |
|
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720 |
| 0 | 721 FLAGS is as in get_expr_operands. |
| 722 | |
| 723 RECURSE_ON_BASE should be set to true if we want to continue | |
| 724 calling get_expr_operands on the base pointer, and false if | |
| 725 something else will do it for us. */ | |
| 726 | |
| 727 static void | |
|
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728 get_indirect_ref_operands (gimple stmt, tree expr, int flags, |
| 0 | 729 bool recurse_on_base) |
| 730 { | |
| 731 tree *pptr = &TREE_OPERAND (expr, 0); | |
| 732 | |
| 733 if (TREE_THIS_VOLATILE (expr)) | |
| 734 gimple_set_has_volatile_ops (stmt, true); | |
| 735 | |
|
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736 /* Add the VOP. */ |
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737 add_virtual_operand (stmt, flags); |
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738 |
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739 /* If requested, add a USE operand for the base pointer. */ |
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740 if (recurse_on_base) |
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741 get_expr_operands (stmt, pptr, |
|
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742 opf_non_addressable | opf_use |
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743 | (flags & (opf_no_vops|opf_not_non_addressable))); |
| 0 | 744 } |
| 745 | |
| 746 | |
| 747 /* A subroutine of get_expr_operands to handle TARGET_MEM_REF. */ | |
| 748 | |
| 749 static void | |
| 750 get_tmr_operands (gimple stmt, tree expr, int flags) | |
| 751 { | |
|
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752 if (TREE_THIS_VOLATILE (expr)) |
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753 gimple_set_has_volatile_ops (stmt, true); |
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754 |
| 0 | 755 /* First record the real operands. */ |
|
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756 get_expr_operands (stmt, &TMR_BASE (expr), opf_use | (flags & opf_no_vops)); |
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757 get_expr_operands (stmt, &TMR_INDEX (expr), opf_use | (flags & opf_no_vops)); |
|
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758 get_expr_operands (stmt, &TMR_INDEX2 (expr), opf_use | (flags & opf_no_vops)); |
| 0 | 759 |
|
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760 add_virtual_operand (stmt, flags); |
| 0 | 761 } |
| 762 | |
| 763 | |
| 764 /* If STMT is a call that may clobber globals and other symbols that | |
| 765 escape, add them to the VDEF/VUSE lists for it. */ | |
| 766 | |
| 767 static void | |
|
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768 maybe_add_call_vops (gimple stmt) |
| 0 | 769 { |
| 770 int call_flags = gimple_call_flags (stmt); | |
| 771 | |
| 772 /* If aliases have been computed already, add VDEF or VUSE | |
| 773 operands for all the symbols that have been found to be | |
| 774 call-clobbered. */ | |
|
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775 if (!(call_flags & ECF_NOVOPS)) |
| 0 | 776 { |
|
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777 /* A 'pure' or a 'const' function never call-clobbers anything. |
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778 A 'noreturn' function might, but since we don't return anyway |
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779 there is no point in recording that. */ |
| 0 | 780 if (!(call_flags & (ECF_PURE | ECF_CONST | ECF_NORETURN))) |
|
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781 add_virtual_operand (stmt, opf_def); |
| 0 | 782 else if (!(call_flags & ECF_CONST)) |
|
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783 add_virtual_operand (stmt, opf_use); |
| 0 | 784 } |
| 785 } | |
| 786 | |
| 787 | |
| 788 /* Scan operands in the ASM_EXPR stmt referred to in INFO. */ | |
| 789 | |
| 790 static void | |
| 791 get_asm_expr_operands (gimple stmt) | |
| 792 { | |
| 793 size_t i, noutputs; | |
| 794 const char **oconstraints; | |
| 795 const char *constraint; | |
| 796 bool allows_mem, allows_reg, is_inout; | |
| 797 | |
| 798 noutputs = gimple_asm_noutputs (stmt); | |
| 799 oconstraints = (const char **) alloca ((noutputs) * sizeof (const char *)); | |
| 800 | |
| 801 /* Gather all output operands. */ | |
| 802 for (i = 0; i < gimple_asm_noutputs (stmt); i++) | |
| 803 { | |
| 804 tree link = gimple_asm_output_op (stmt, i); | |
| 805 constraint = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link))); | |
| 806 oconstraints[i] = constraint; | |
| 807 parse_output_constraint (&constraint, i, 0, 0, &allows_mem, | |
| 808 &allows_reg, &is_inout); | |
| 809 | |
| 810 /* This should have been split in gimplify_asm_expr. */ | |
| 811 gcc_assert (!allows_reg || !is_inout); | |
| 812 | |
| 813 /* Memory operands are addressable. Note that STMT needs the | |
| 814 address of this operand. */ | |
| 815 if (!allows_reg && allows_mem) | |
|
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816 mark_address_taken (TREE_VALUE (link)); |
| 0 | 817 |
|
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818 get_expr_operands (stmt, &TREE_VALUE (link), opf_def | opf_not_non_addressable); |
| 0 | 819 } |
| 820 | |
| 821 /* Gather all input operands. */ | |
| 822 for (i = 0; i < gimple_asm_ninputs (stmt); i++) | |
| 823 { | |
| 824 tree link = gimple_asm_input_op (stmt, i); | |
| 825 constraint = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link))); | |
| 826 parse_input_constraint (&constraint, 0, 0, noutputs, 0, oconstraints, | |
| 827 &allows_mem, &allows_reg); | |
| 828 | |
| 829 /* Memory operands are addressable. Note that STMT needs the | |
| 830 address of this operand. */ | |
| 831 if (!allows_reg && allows_mem) | |
|
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832 mark_address_taken (TREE_VALUE (link)); |
| 0 | 833 |
|
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834 get_expr_operands (stmt, &TREE_VALUE (link), opf_not_non_addressable); |
| 0 | 835 } |
| 836 | |
| 837 /* Clobber all memory and addressable symbols for asm ("" : : : "memory"); */ | |
| 838 for (i = 0; i < gimple_asm_nclobbers (stmt); i++) | |
| 839 { | |
| 840 tree link = gimple_asm_clobber_op (stmt, i); | |
| 841 if (strcmp (TREE_STRING_POINTER (TREE_VALUE (link)), "memory") == 0) | |
| 842 { | |
|
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843 add_virtual_operand (stmt, opf_def); |
| 0 | 844 break; |
| 845 } | |
| 846 } | |
| 847 } | |
| 848 | |
| 849 | |
| 850 /* Recursively scan the expression pointed to by EXPR_P in statement | |
| 851 STMT. FLAGS is one of the OPF_* constants modifying how to | |
| 852 interpret the operands found. */ | |
| 853 | |
| 854 static void | |
| 855 get_expr_operands (gimple stmt, tree *expr_p, int flags) | |
| 856 { | |
| 857 enum tree_code code; | |
| 858 enum tree_code_class codeclass; | |
| 859 tree expr = *expr_p; | |
|
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860 int uflags = opf_use; |
| 0 | 861 |
| 862 if (expr == NULL) | |
| 863 return; | |
| 864 | |
|
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865 if (is_gimple_debug (stmt)) |
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866 uflags |= (flags & opf_no_vops); |
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867 |
| 0 | 868 code = TREE_CODE (expr); |
| 869 codeclass = TREE_CODE_CLASS (code); | |
| 870 | |
| 871 switch (code) | |
| 872 { | |
| 873 case ADDR_EXPR: | |
| 874 /* Taking the address of a variable does not represent a | |
| 875 reference to it, but the fact that the statement takes its | |
| 876 address will be of interest to some passes (e.g. alias | |
| 877 resolution). */ | |
|
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878 if ((!(flags & opf_non_addressable) |
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879 || (flags & opf_not_non_addressable)) |
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880 && !is_gimple_debug (stmt)) |
|
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881 mark_address_taken (TREE_OPERAND (expr, 0)); |
| 0 | 882 |
| 883 /* If the address is invariant, there may be no interesting | |
| 884 variable references inside. */ | |
| 885 if (is_gimple_min_invariant (expr)) | |
| 886 return; | |
| 887 | |
| 888 /* Otherwise, there may be variables referenced inside but there | |
| 889 should be no VUSEs created, since the referenced objects are | |
| 890 not really accessed. The only operands that we should find | |
| 891 here are ARRAY_REF indices which will always be real operands | |
| 892 (GIMPLE does not allow non-registers as array indices). */ | |
| 893 flags |= opf_no_vops; | |
|
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894 get_expr_operands (stmt, &TREE_OPERAND (expr, 0), |
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895 flags | opf_not_non_addressable); |
| 0 | 896 return; |
| 897 | |
| 898 case SSA_NAME: | |
| 899 add_stmt_operand (expr_p, stmt, flags); | |
| 900 return; | |
| 901 | |
| 902 case VAR_DECL: | |
| 903 case PARM_DECL: | |
| 904 case RESULT_DECL: | |
| 905 add_stmt_operand (expr_p, stmt, flags); | |
| 906 return; | |
| 907 | |
|
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908 case DEBUG_EXPR_DECL: |
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909 gcc_assert (gimple_debug_bind_p (stmt)); |
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910 return; |
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911 |
|
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912 case MEM_REF: |
|
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913 get_indirect_ref_operands (stmt, expr, flags, true); |
| 0 | 914 return; |
| 915 | |
| 916 case TARGET_MEM_REF: | |
| 917 get_tmr_operands (stmt, expr, flags); | |
| 918 return; | |
| 919 | |
| 920 case ARRAY_REF: | |
| 921 case ARRAY_RANGE_REF: | |
| 922 case COMPONENT_REF: | |
| 923 case REALPART_EXPR: | |
| 924 case IMAGPART_EXPR: | |
| 925 { | |
| 926 if (TREE_THIS_VOLATILE (expr)) | |
| 927 gimple_set_has_volatile_ops (stmt, true); | |
| 928 | |
|
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929 get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags); |
| 0 | 930 |
| 931 if (code == COMPONENT_REF) | |
| 932 { | |
| 933 if (TREE_THIS_VOLATILE (TREE_OPERAND (expr, 1))) | |
| 934 gimple_set_has_volatile_ops (stmt, true); | |
|
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935 get_expr_operands (stmt, &TREE_OPERAND (expr, 2), uflags); |
| 0 | 936 } |
| 937 else if (code == ARRAY_REF || code == ARRAY_RANGE_REF) | |
| 938 { | |
|
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939 get_expr_operands (stmt, &TREE_OPERAND (expr, 1), uflags); |
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940 get_expr_operands (stmt, &TREE_OPERAND (expr, 2), uflags); |
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941 get_expr_operands (stmt, &TREE_OPERAND (expr, 3), uflags); |
| 0 | 942 } |
| 943 | |
| 944 return; | |
| 945 } | |
| 946 | |
| 947 case WITH_SIZE_EXPR: | |
| 948 /* WITH_SIZE_EXPR is a pass-through reference to its first argument, | |
| 949 and an rvalue reference to its second argument. */ | |
|
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950 get_expr_operands (stmt, &TREE_OPERAND (expr, 1), uflags); |
| 0 | 951 get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags); |
| 952 return; | |
| 953 | |
| 954 case COND_EXPR: | |
| 955 case VEC_COND_EXPR: | |
|
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956 get_expr_operands (stmt, &TREE_OPERAND (expr, 0), uflags); |
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957 get_expr_operands (stmt, &TREE_OPERAND (expr, 1), uflags); |
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|
958 get_expr_operands (stmt, &TREE_OPERAND (expr, 2), uflags); |
| 0 | 959 return; |
| 960 | |
| 961 case CONSTRUCTOR: | |
| 962 { | |
| 963 /* General aggregate CONSTRUCTORs have been decomposed, but they | |
| 964 are still in use as the COMPLEX_EXPR equivalent for vectors. */ | |
| 965 constructor_elt *ce; | |
| 966 unsigned HOST_WIDE_INT idx; | |
| 967 | |
| 968 for (idx = 0; | |
| 969 VEC_iterate (constructor_elt, CONSTRUCTOR_ELTS (expr), idx, ce); | |
| 970 idx++) | |
|
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971 get_expr_operands (stmt, &ce->value, uflags); |
| 0 | 972 |
| 973 return; | |
| 974 } | |
| 975 | |
| 976 case BIT_FIELD_REF: | |
| 977 if (TREE_THIS_VOLATILE (expr)) | |
| 978 gimple_set_has_volatile_ops (stmt, true); | |
| 979 /* FALLTHRU */ | |
| 980 | |
| 981 case TRUTH_NOT_EXPR: | |
| 982 case VIEW_CONVERT_EXPR: | |
| 983 do_unary: | |
| 984 get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags); | |
| 985 return; | |
| 986 | |
| 987 case TRUTH_AND_EXPR: | |
| 988 case TRUTH_OR_EXPR: | |
| 989 case TRUTH_XOR_EXPR: | |
| 990 case COMPOUND_EXPR: | |
| 991 case OBJ_TYPE_REF: | |
| 992 case ASSERT_EXPR: | |
| 993 do_binary: | |
| 994 { | |
| 995 get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags); | |
| 996 get_expr_operands (stmt, &TREE_OPERAND (expr, 1), flags); | |
| 997 return; | |
| 998 } | |
| 999 | |
| 1000 case DOT_PROD_EXPR: | |
| 1001 case REALIGN_LOAD_EXPR: | |
|
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1002 case WIDEN_MULT_PLUS_EXPR: |
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1003 case WIDEN_MULT_MINUS_EXPR: |
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1004 case FMA_EXPR: |
| 0 | 1005 { |
| 1006 get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags); | |
|
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1007 get_expr_operands (stmt, &TREE_OPERAND (expr, 1), flags); |
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1008 get_expr_operands (stmt, &TREE_OPERAND (expr, 2), flags); |
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1009 return; |
| 0 | 1010 } |
| 1011 | |
| 1012 case FUNCTION_DECL: | |
| 1013 case LABEL_DECL: | |
| 1014 case CONST_DECL: | |
| 1015 case CASE_LABEL_EXPR: | |
| 1016 /* Expressions that make no memory references. */ | |
| 1017 return; | |
| 1018 | |
| 1019 default: | |
| 1020 if (codeclass == tcc_unary) | |
| 1021 goto do_unary; | |
| 1022 if (codeclass == tcc_binary || codeclass == tcc_comparison) | |
| 1023 goto do_binary; | |
| 1024 if (codeclass == tcc_constant || codeclass == tcc_type) | |
| 1025 return; | |
| 1026 } | |
| 1027 | |
| 1028 /* If we get here, something has gone wrong. */ | |
| 1029 #ifdef ENABLE_CHECKING | |
| 1030 fprintf (stderr, "unhandled expression in get_expr_operands():\n"); | |
| 1031 debug_tree (expr); | |
| 1032 fputs ("\n", stderr); | |
| 1033 #endif | |
| 1034 gcc_unreachable (); | |
| 1035 } | |
| 1036 | |
| 1037 | |
| 1038 /* Parse STMT looking for operands. When finished, the various | |
| 1039 build_* operand vectors will have potential operands in them. */ | |
| 1040 | |
| 1041 static void | |
| 1042 parse_ssa_operands (gimple stmt) | |
| 1043 { | |
| 1044 enum gimple_code code = gimple_code (stmt); | |
| 1045 | |
| 1046 if (code == GIMPLE_ASM) | |
| 1047 get_asm_expr_operands (stmt); | |
|
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1048 else if (is_gimple_debug (stmt)) |
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1049 { |
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1050 if (gimple_debug_bind_p (stmt) |
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1051 && gimple_debug_bind_has_value_p (stmt)) |
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1052 get_expr_operands (stmt, gimple_debug_bind_get_value_ptr (stmt), |
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1053 opf_use | opf_no_vops); |
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1054 } |
| 0 | 1055 else |
| 1056 { | |
| 1057 size_t i, start = 0; | |
| 1058 | |
| 1059 if (code == GIMPLE_ASSIGN || code == GIMPLE_CALL) | |
| 1060 { | |
| 1061 get_expr_operands (stmt, gimple_op_ptr (stmt, 0), opf_def); | |
| 1062 start = 1; | |
| 1063 } | |
| 1064 | |
| 1065 for (i = start; i < gimple_num_ops (stmt); i++) | |
| 1066 get_expr_operands (stmt, gimple_op_ptr (stmt, i), opf_use); | |
| 1067 | |
| 1068 /* Add call-clobbered operands, if needed. */ | |
| 1069 if (code == GIMPLE_CALL) | |
|
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1070 maybe_add_call_vops (stmt); |
| 0 | 1071 } |
| 1072 } | |
| 1073 | |
| 1074 | |
| 1075 /* Create an operands cache for STMT. */ | |
| 1076 | |
| 1077 static void | |
| 1078 build_ssa_operands (gimple stmt) | |
| 1079 { | |
|
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1080 /* Initially assume that the statement has no volatile operands. */ |
| 0 | 1081 gimple_set_has_volatile_ops (stmt, false); |
| 1082 | |
| 1083 start_ssa_stmt_operands (); | |
| 1084 parse_ssa_operands (stmt); | |
| 1085 finalize_ssa_stmt_operands (stmt); | |
| 1086 } | |
| 1087 | |
| 1088 | |
| 1089 /* Releases the operands of STMT back to their freelists, and clears | |
| 1090 the stmt operand lists. */ | |
| 1091 | |
| 1092 void | |
| 1093 free_stmt_operands (gimple stmt) | |
| 1094 { | |
| 1095 def_optype_p defs = gimple_def_ops (stmt), last_def; | |
| 1096 use_optype_p uses = gimple_use_ops (stmt), last_use; | |
| 1097 | |
| 1098 if (defs) | |
| 1099 { | |
| 1100 for (last_def = defs; last_def->next; last_def = last_def->next) | |
| 1101 continue; | |
| 1102 last_def->next = gimple_ssa_operands (cfun)->free_defs; | |
| 1103 gimple_ssa_operands (cfun)->free_defs = defs; | |
| 1104 gimple_set_def_ops (stmt, NULL); | |
| 1105 } | |
| 1106 | |
| 1107 if (uses) | |
| 1108 { | |
| 1109 for (last_use = uses; last_use->next; last_use = last_use->next) | |
| 1110 delink_imm_use (USE_OP_PTR (last_use)); | |
| 1111 delink_imm_use (USE_OP_PTR (last_use)); | |
| 1112 last_use->next = gimple_ssa_operands (cfun)->free_uses; | |
| 1113 gimple_ssa_operands (cfun)->free_uses = uses; | |
| 1114 gimple_set_use_ops (stmt, NULL); | |
| 1115 } | |
| 1116 | |
| 1117 if (gimple_has_mem_ops (stmt)) | |
| 1118 { | |
|
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|
1119 gimple_set_vuse (stmt, NULL_TREE); |
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1120 gimple_set_vdef (stmt, NULL_TREE); |
| 0 | 1121 } |
| 1122 } | |
| 1123 | |
| 1124 | |
| 1125 /* Get the operands of statement STMT. */ | |
| 1126 | |
| 1127 void | |
| 1128 update_stmt_operands (gimple stmt) | |
| 1129 { | |
| 1130 /* If update_stmt_operands is called before SSA is initialized, do | |
| 1131 nothing. */ | |
| 1132 if (!ssa_operands_active ()) | |
| 1133 return; | |
| 1134 | |
| 1135 timevar_push (TV_TREE_OPS); | |
| 1136 | |
| 1137 gcc_assert (gimple_modified_p (stmt)); | |
| 1138 build_ssa_operands (stmt); | |
| 1139 gimple_set_modified (stmt, false); | |
| 1140 | |
| 1141 timevar_pop (TV_TREE_OPS); | |
| 1142 } | |
| 1143 | |
| 1144 | |
| 1145 /* Swap operands EXP0 and EXP1 in statement STMT. No attempt is done | |
| 1146 to test the validity of the swap operation. */ | |
| 1147 | |
| 1148 void | |
| 1149 swap_tree_operands (gimple stmt, tree *exp0, tree *exp1) | |
| 1150 { | |
| 1151 tree op0, op1; | |
| 1152 op0 = *exp0; | |
| 1153 op1 = *exp1; | |
| 1154 | |
| 1155 /* If the operand cache is active, attempt to preserve the relative | |
| 1156 positions of these two operands in their respective immediate use | |
| 1157 lists. */ | |
| 1158 if (ssa_operands_active () && op0 != op1) | |
| 1159 { | |
| 1160 use_optype_p use0, use1, ptr; | |
| 1161 use0 = use1 = NULL; | |
| 1162 | |
| 1163 /* Find the 2 operands in the cache, if they are there. */ | |
| 1164 for (ptr = gimple_use_ops (stmt); ptr; ptr = ptr->next) | |
| 1165 if (USE_OP_PTR (ptr)->use == exp0) | |
| 1166 { | |
| 1167 use0 = ptr; | |
| 1168 break; | |
| 1169 } | |
| 1170 | |
| 1171 for (ptr = gimple_use_ops (stmt); ptr; ptr = ptr->next) | |
| 1172 if (USE_OP_PTR (ptr)->use == exp1) | |
| 1173 { | |
| 1174 use1 = ptr; | |
| 1175 break; | |
| 1176 } | |
| 1177 | |
| 1178 /* If both uses don't have operand entries, there isn't much we can do | |
| 1179 at this point. Presumably we don't need to worry about it. */ | |
| 1180 if (use0 && use1) | |
| 1181 { | |
| 1182 tree *tmp = USE_OP_PTR (use1)->use; | |
| 1183 USE_OP_PTR (use1)->use = USE_OP_PTR (use0)->use; | |
| 1184 USE_OP_PTR (use0)->use = tmp; | |
| 1185 } | |
| 1186 } | |
| 1187 | |
| 1188 /* Now swap the data. */ | |
| 1189 *exp0 = op1; | |
| 1190 *exp1 = op0; | |
| 1191 } | |
| 1192 | |
| 1193 | |
| 1194 /* Scan the immediate_use list for VAR making sure its linked properly. | |
| 1195 Return TRUE if there is a problem and emit an error message to F. */ | |
| 1196 | |
|
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|
1197 DEBUG_FUNCTION bool |
| 0 | 1198 verify_imm_links (FILE *f, tree var) |
| 1199 { | |
| 1200 use_operand_p ptr, prev, list; | |
| 1201 int count; | |
| 1202 | |
| 1203 gcc_assert (TREE_CODE (var) == SSA_NAME); | |
| 1204 | |
| 1205 list = &(SSA_NAME_IMM_USE_NODE (var)); | |
| 1206 gcc_assert (list->use == NULL); | |
| 1207 | |
| 1208 if (list->prev == NULL) | |
| 1209 { | |
| 1210 gcc_assert (list->next == NULL); | |
| 1211 return false; | |
| 1212 } | |
| 1213 | |
| 1214 prev = list; | |
| 1215 count = 0; | |
| 1216 for (ptr = list->next; ptr != list; ) | |
| 1217 { | |
| 1218 if (prev != ptr->prev) | |
| 1219 goto error; | |
|
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1220 |
| 0 | 1221 if (ptr->use == NULL) |
| 1222 goto error; /* 2 roots, or SAFE guard node. */ | |
| 1223 else if (*(ptr->use) != var) | |
| 1224 goto error; | |
| 1225 | |
| 1226 prev = ptr; | |
| 1227 ptr = ptr->next; | |
| 1228 | |
| 1229 /* Avoid infinite loops. 50,000,000 uses probably indicates a | |
| 1230 problem. */ | |
| 1231 if (count++ > 50000000) | |
| 1232 goto error; | |
| 1233 } | |
| 1234 | |
| 1235 /* Verify list in the other direction. */ | |
| 1236 prev = list; | |
| 1237 for (ptr = list->prev; ptr != list; ) | |
| 1238 { | |
| 1239 if (prev != ptr->next) | |
| 1240 goto error; | |
| 1241 prev = ptr; | |
| 1242 ptr = ptr->prev; | |
| 1243 if (count-- < 0) | |
| 1244 goto error; | |
| 1245 } | |
| 1246 | |
| 1247 if (count != 0) | |
| 1248 goto error; | |
| 1249 | |
| 1250 return false; | |
| 1251 | |
| 1252 error: | |
| 1253 if (ptr->loc.stmt && gimple_modified_p (ptr->loc.stmt)) | |
| 1254 { | |
| 1255 fprintf (f, " STMT MODIFIED. - <%p> ", (void *)ptr->loc.stmt); | |
| 1256 print_gimple_stmt (f, ptr->loc.stmt, 0, TDF_SLIM); | |
| 1257 } | |
|
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|
1258 fprintf (f, " IMM ERROR : (use_p : tree - %p:%p)", (void *)ptr, |
| 0 | 1259 (void *)ptr->use); |
| 1260 print_generic_expr (f, USE_FROM_PTR (ptr), TDF_SLIM); | |
| 1261 fprintf(f, "\n"); | |
| 1262 return true; | |
| 1263 } | |
| 1264 | |
| 1265 | |
| 1266 /* Dump all the immediate uses to FILE. */ | |
| 1267 | |
| 1268 void | |
| 1269 dump_immediate_uses_for (FILE *file, tree var) | |
| 1270 { | |
| 1271 imm_use_iterator iter; | |
| 1272 use_operand_p use_p; | |
| 1273 | |
| 1274 gcc_assert (var && TREE_CODE (var) == SSA_NAME); | |
| 1275 | |
| 1276 print_generic_expr (file, var, TDF_SLIM); | |
| 1277 fprintf (file, " : -->"); | |
| 1278 if (has_zero_uses (var)) | |
| 1279 fprintf (file, " no uses.\n"); | |
| 1280 else | |
| 1281 if (has_single_use (var)) | |
| 1282 fprintf (file, " single use.\n"); | |
| 1283 else | |
| 1284 fprintf (file, "%d uses.\n", num_imm_uses (var)); | |
| 1285 | |
| 1286 FOR_EACH_IMM_USE_FAST (use_p, iter, var) | |
| 1287 { | |
| 1288 if (use_p->loc.stmt == NULL && use_p->use == NULL) | |
| 1289 fprintf (file, "***end of stmt iterator marker***\n"); | |
| 1290 else | |
| 1291 if (!is_gimple_reg (USE_FROM_PTR (use_p))) | |
| 1292 print_gimple_stmt (file, USE_STMT (use_p), 0, TDF_VOPS|TDF_MEMSYMS); | |
| 1293 else | |
| 1294 print_gimple_stmt (file, USE_STMT (use_p), 0, TDF_SLIM); | |
| 1295 } | |
| 1296 fprintf(file, "\n"); | |
| 1297 } | |
| 1298 | |
| 1299 | |
| 1300 /* Dump all the immediate uses to FILE. */ | |
| 1301 | |
| 1302 void | |
| 1303 dump_immediate_uses (FILE *file) | |
| 1304 { | |
| 1305 tree var; | |
| 1306 unsigned int x; | |
| 1307 | |
| 1308 fprintf (file, "Immediate_uses: \n\n"); | |
| 1309 for (x = 1; x < num_ssa_names; x++) | |
| 1310 { | |
| 1311 var = ssa_name(x); | |
| 1312 if (!var) | |
| 1313 continue; | |
| 1314 dump_immediate_uses_for (file, var); | |
| 1315 } | |
| 1316 } | |
| 1317 | |
| 1318 | |
| 1319 /* Dump def-use edges on stderr. */ | |
| 1320 | |
|
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|
1321 DEBUG_FUNCTION void |
| 0 | 1322 debug_immediate_uses (void) |
| 1323 { | |
| 1324 dump_immediate_uses (stderr); | |
| 1325 } | |
| 1326 | |
| 1327 | |
| 1328 /* Dump def-use edges on stderr. */ | |
| 1329 | |
|
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|
1330 DEBUG_FUNCTION void |
| 0 | 1331 debug_immediate_uses_for (tree var) |
| 1332 { | |
| 1333 dump_immediate_uses_for (stderr, var); | |
| 1334 } | |
| 1335 | |
| 1336 | |
|
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1337 /* Unlink STMTs virtual definition from the IL by propagating its use. */ |
| 0 | 1338 |
| 1339 void | |
|
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1340 unlink_stmt_vdef (gimple stmt) |
| 0 | 1341 { |
|
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1342 use_operand_p use_p; |
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1343 imm_use_iterator iter; |
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1344 gimple use_stmt; |
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1345 tree vdef = gimple_vdef (stmt); |
| 0 | 1346 |
|
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1347 if (!vdef |
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1348 || TREE_CODE (vdef) != SSA_NAME) |
| 0 | 1349 return; |
| 1350 | |
|
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1351 FOR_EACH_IMM_USE_STMT (use_stmt, iter, gimple_vdef (stmt)) |
| 0 | 1352 { |
|
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1353 FOR_EACH_IMM_USE_ON_STMT (use_p, iter) |
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1354 SET_USE (use_p, gimple_vuse (stmt)); |
| 0 | 1355 } |
| 1356 | |
|
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1357 if (SSA_NAME_OCCURS_IN_ABNORMAL_PHI (gimple_vdef (stmt))) |
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77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
1358 SSA_NAME_OCCURS_IN_ABNORMAL_PHI (gimple_vuse (stmt)) = 1; |
| 0 | 1359 } |
| 1360 |