Mercurial > hg > CbC > CbC_gcc
annotate gcc/tree-ssa-operands.c @ 67:f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
| author | nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> |
|---|---|
| date | Tue, 22 Mar 2011 17:18:12 +0900 |
| parents | b7f97abdc517 |
| children | 1b10fe6932e1 04ced10e8804 |
| 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" | |
| 37 | |
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38 /* This file contains the code required to manage the operands cache of the |
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39 SSA optimizer. For every stmt, we maintain an operand cache in the stmt |
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40 annotation. This cache contains operands that will be of interest to |
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41 optimizers and other passes wishing to manipulate the IL. |
| 0 | 42 |
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43 The operand type are broken up into REAL and VIRTUAL operands. The real |
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44 operands are represented as pointers into the stmt's operand tree. Thus |
| 0 | 45 any manipulation of the real operands will be reflected in the actual tree. |
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46 Virtual operands are represented solely in the cache, although the base |
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47 variable for the SSA_NAME may, or may not occur in the stmt's tree. |
| 0 | 48 Manipulation of the virtual operands will not be reflected in the stmt tree. |
| 49 | |
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50 The routines in this file are concerned with creating this operand cache |
| 0 | 51 from a stmt tree. |
| 52 | |
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53 The operand tree is the parsed by the various get_* routines which look |
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54 through the stmt tree for the occurrence of operands which may be of |
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55 interest, and calls are made to the append_* routines whenever one is |
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56 found. There are 4 of these routines, each representing one of the |
| 0 | 57 4 types of operands. Defs, Uses, Virtual Uses, and Virtual May Defs. |
| 58 | |
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59 The append_* routines check for duplication, and simply keep a list of |
| 0 | 60 unique objects for each operand type in the build_* extendable vectors. |
| 61 | |
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62 Once the stmt tree is completely parsed, the finalize_ssa_operands() |
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63 routine is called, which proceeds to perform the finalization routine |
| 0 | 64 on each of the 4 operand vectors which have been built up. |
| 65 | |
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66 If the stmt had a previous operand cache, the finalization routines |
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67 attempt to match up the new operands with the old ones. If it's a perfect |
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68 match, the old vector is simply reused. If it isn't a perfect match, then |
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69 a new vector is created and the new operands are placed there. For |
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70 virtual operands, if the previous cache had SSA_NAME version of a |
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71 variable, and that same variable occurs in the same operands cache, then |
| 0 | 72 the new cache vector will also get the same SSA_NAME. |
| 73 | |
| 74 i.e., if a stmt had a VUSE of 'a_5', and 'a' occurs in the new | |
| 75 operand vector for VUSE, then the new vector will also be modified | |
| 76 such that it contains 'a_5' rather than 'a'. */ | |
| 77 | |
| 78 /* Structure storing statistics on how many call clobbers we have, and | |
| 79 how many where avoided. */ | |
| 80 | |
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81 static struct |
| 0 | 82 { |
| 83 /* Number of call-clobbered ops we attempt to add to calls in | |
| 84 add_call_clobbered_mem_symbols. */ | |
| 85 unsigned int clobbered_vars; | |
| 86 | |
| 87 /* Number of write-clobbers (VDEFs) avoided by using | |
| 88 not_written information. */ | |
| 89 unsigned int static_write_clobbers_avoided; | |
| 90 | |
| 91 /* Number of reads (VUSEs) avoided by using not_read information. */ | |
| 92 unsigned int static_read_clobbers_avoided; | |
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93 |
| 0 | 94 /* Number of write-clobbers avoided because the variable can't escape to |
| 95 this call. */ | |
| 96 unsigned int unescapable_clobbers_avoided; | |
| 97 | |
| 98 /* Number of read-only uses we attempt to add to calls in | |
| 99 add_call_read_mem_symbols. */ | |
| 100 unsigned int readonly_clobbers; | |
| 101 | |
| 102 /* Number of read-only uses we avoid using not_read information. */ | |
| 103 unsigned int static_readonly_clobbers_avoided; | |
| 104 } clobber_stats; | |
| 105 | |
| 106 | |
| 107 /* Flags to describe operand properties in helpers. */ | |
| 108 | |
| 109 /* By default, operands are loaded. */ | |
| 110 #define opf_use 0 | |
| 111 | |
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112 /* Operand is the target of an assignment expression or a |
| 0 | 113 call-clobbered variable. */ |
| 114 #define opf_def (1 << 0) | |
| 115 | |
| 116 /* No virtual operands should be created in the expression. This is used | |
| 117 when traversing ADDR_EXPR nodes which have different semantics than | |
| 118 other expressions. Inside an ADDR_EXPR node, the only operands that we | |
| 119 need to consider are indices into arrays. For instance, &a.b[i] should | |
| 120 generate a USE of 'i' but it should not generate a VUSE for 'a' nor a | |
| 121 VUSE for 'b'. */ | |
| 122 #define opf_no_vops (1 << 1) | |
| 123 | |
| 124 /* Operand is an implicit reference. This is used to distinguish | |
| 125 explicit assignments in the form of MODIFY_EXPR from | |
| 126 clobbering sites like function calls or ASM_EXPRs. */ | |
| 127 #define opf_implicit (1 << 2) | |
| 128 | |
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129 /* Operand is in a place where address-taken does not imply addressable. */ |
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130 #define opf_non_addressable (1 << 3) |
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131 |
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132 /* Operand is in a place where opf_non_addressable does not apply. */ |
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133 #define opf_not_non_addressable (1 << 4) |
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134 |
| 0 | 135 /* Array for building all the def operands. */ |
| 136 static VEC(tree,heap) *build_defs; | |
| 137 | |
| 138 /* Array for building all the use operands. */ | |
| 139 static VEC(tree,heap) *build_uses; | |
| 140 | |
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141 /* The built VDEF operand. */ |
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142 static tree build_vdef; |
| 0 | 143 |
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144 /* The built VUSE operand. */ |
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145 static tree build_vuse; |
| 0 | 146 |
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147 /* Bitmap obstack for our datastructures that needs to survive across |
| 0 | 148 compilations of multiple functions. */ |
| 149 static bitmap_obstack operands_bitmap_obstack; | |
| 150 | |
| 151 static void get_expr_operands (gimple, tree *, int); | |
| 152 | |
| 153 /* Number of functions with initialized ssa_operands. */ | |
| 154 static int n_initialized = 0; | |
| 155 | |
| 156 /* Return the DECL_UID of the base variable of T. */ | |
| 157 | |
| 158 static inline unsigned | |
| 159 get_name_decl (const_tree t) | |
| 160 { | |
| 161 if (TREE_CODE (t) != SSA_NAME) | |
| 162 return DECL_UID (t); | |
| 163 else | |
| 164 return DECL_UID (SSA_NAME_VAR (t)); | |
| 165 } | |
| 166 | |
| 167 | |
| 168 /* Return true if the SSA operands cache is active. */ | |
| 169 | |
| 170 bool | |
| 171 ssa_operands_active (void) | |
| 172 { | |
| 173 /* This function may be invoked from contexts where CFUN is NULL | |
| 174 (IPA passes), return false for now. FIXME: operands may be | |
| 175 active in each individual function, maybe this function should | |
| 176 take CFUN as a parameter. */ | |
| 177 if (cfun == NULL) | |
| 178 return false; | |
| 179 | |
| 180 return cfun->gimple_df && gimple_ssa_operands (cfun)->ops_active; | |
| 181 } | |
| 182 | |
| 183 | |
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184 /* Create the VOP variable, an artificial global variable to act as a |
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185 representative of all of the virtual operands FUD chain. */ |
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186 |
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187 static void |
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188 create_vop_var (void) |
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189 { |
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190 tree global_var; |
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191 |
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192 gcc_assert (cfun->gimple_df->vop == NULL_TREE); |
| 0 | 193 |
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194 global_var = build_decl (BUILTINS_LOCATION, VAR_DECL, |
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195 get_identifier (".MEM"), |
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196 void_type_node); |
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197 DECL_ARTIFICIAL (global_var) = 1; |
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198 TREE_READONLY (global_var) = 0; |
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199 DECL_EXTERNAL (global_var) = 1; |
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200 TREE_STATIC (global_var) = 1; |
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201 TREE_USED (global_var) = 1; |
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202 DECL_CONTEXT (global_var) = NULL_TREE; |
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203 TREE_THIS_VOLATILE (global_var) = 0; |
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204 TREE_ADDRESSABLE (global_var) = 0; |
| 0 | 205 |
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206 create_var_ann (global_var); |
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207 add_referenced_var (global_var); |
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208 cfun->gimple_df->vop = global_var; |
| 0 | 209 } |
| 210 | |
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211 /* These are the sizes of the operand memory buffer in bytes which gets |
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212 allocated each time more operands space is required. The final value is |
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213 the amount that is allocated every time after that. |
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214 In 1k we can fit 25 use operands (or 63 def operands) on a host with |
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215 8 byte pointers, that would be 10 statements each with 1 def and 2 |
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216 uses. */ |
| 0 | 217 |
| 218 #define OP_SIZE_INIT 0 | |
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219 #define OP_SIZE_1 (1024 - sizeof (void *)) |
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220 #define OP_SIZE_2 (1024 * 4 - sizeof (void *)) |
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221 #define OP_SIZE_3 (1024 * 16 - sizeof (void *)) |
| 0 | 222 |
| 223 /* Initialize the operand cache routines. */ | |
| 224 | |
| 225 void | |
| 226 init_ssa_operands (void) | |
| 227 { | |
| 228 if (!n_initialized++) | |
| 229 { | |
| 230 build_defs = VEC_alloc (tree, heap, 5); | |
| 231 build_uses = VEC_alloc (tree, heap, 10); | |
|
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232 build_vuse = NULL_TREE; |
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233 build_vdef = NULL_TREE; |
| 0 | 234 bitmap_obstack_initialize (&operands_bitmap_obstack); |
| 235 } | |
| 236 | |
| 237 gcc_assert (gimple_ssa_operands (cfun)->operand_memory == NULL); | |
| 238 gimple_ssa_operands (cfun)->operand_memory_index | |
| 239 = gimple_ssa_operands (cfun)->ssa_operand_mem_size; | |
| 240 gimple_ssa_operands (cfun)->ops_active = true; | |
| 241 memset (&clobber_stats, 0, sizeof (clobber_stats)); | |
| 242 gimple_ssa_operands (cfun)->ssa_operand_mem_size = OP_SIZE_INIT; | |
|
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243 create_vop_var (); |
| 0 | 244 } |
| 245 | |
| 246 | |
| 247 /* Dispose of anything required by the operand routines. */ | |
| 248 | |
| 249 void | |
| 250 fini_ssa_operands (void) | |
| 251 { | |
| 252 struct ssa_operand_memory_d *ptr; | |
| 253 | |
| 254 if (!--n_initialized) | |
| 255 { | |
| 256 VEC_free (tree, heap, build_defs); | |
| 257 VEC_free (tree, heap, build_uses); | |
|
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258 build_vdef = NULL_TREE; |
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259 build_vuse = NULL_TREE; |
| 0 | 260 } |
| 261 | |
| 262 gimple_ssa_operands (cfun)->free_defs = NULL; | |
| 263 gimple_ssa_operands (cfun)->free_uses = NULL; | |
| 264 | |
| 265 while ((ptr = gimple_ssa_operands (cfun)->operand_memory) != NULL) | |
| 266 { | |
| 267 gimple_ssa_operands (cfun)->operand_memory | |
| 268 = gimple_ssa_operands (cfun)->operand_memory->next; | |
| 269 ggc_free (ptr); | |
| 270 } | |
| 271 | |
| 272 gimple_ssa_operands (cfun)->ops_active = false; | |
| 273 | |
| 274 if (!n_initialized) | |
| 275 bitmap_obstack_release (&operands_bitmap_obstack); | |
| 276 | |
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277 cfun->gimple_df->vop = NULL_TREE; |
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278 |
| 0 | 279 if (dump_file && (dump_flags & TDF_STATS)) |
| 280 { | |
| 281 fprintf (dump_file, "Original clobbered vars: %d\n", | |
| 282 clobber_stats.clobbered_vars); | |
| 283 fprintf (dump_file, "Static write clobbers avoided: %d\n", | |
| 284 clobber_stats.static_write_clobbers_avoided); | |
| 285 fprintf (dump_file, "Static read clobbers avoided: %d\n", | |
| 286 clobber_stats.static_read_clobbers_avoided); | |
| 287 fprintf (dump_file, "Unescapable clobbers avoided: %d\n", | |
| 288 clobber_stats.unescapable_clobbers_avoided); | |
| 289 fprintf (dump_file, "Original read-only clobbers: %d\n", | |
| 290 clobber_stats.readonly_clobbers); | |
| 291 fprintf (dump_file, "Static read-only clobbers avoided: %d\n", | |
| 292 clobber_stats.static_readonly_clobbers_avoided); | |
| 293 } | |
| 294 } | |
| 295 | |
| 296 | |
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297 /* Return memory for an operand of size SIZE. */ |
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298 |
| 0 | 299 static inline void * |
| 300 ssa_operand_alloc (unsigned size) | |
| 301 { | |
| 302 char *ptr; | |
| 303 | |
|
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304 gcc_assert (size == sizeof (struct use_optype_d) |
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305 || size == sizeof (struct def_optype_d)); |
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306 |
| 0 | 307 if (gimple_ssa_operands (cfun)->operand_memory_index + size |
| 308 >= gimple_ssa_operands (cfun)->ssa_operand_mem_size) | |
| 309 { | |
| 310 struct ssa_operand_memory_d *ptr; | |
| 311 | |
|
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312 switch (gimple_ssa_operands (cfun)->ssa_operand_mem_size) |
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313 { |
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314 case OP_SIZE_INIT: |
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315 gimple_ssa_operands (cfun)->ssa_operand_mem_size = OP_SIZE_1; |
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316 break; |
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317 case OP_SIZE_1: |
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318 gimple_ssa_operands (cfun)->ssa_operand_mem_size = OP_SIZE_2; |
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319 break; |
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320 case OP_SIZE_2: |
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321 case OP_SIZE_3: |
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322 gimple_ssa_operands (cfun)->ssa_operand_mem_size = OP_SIZE_3; |
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323 break; |
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324 default: |
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325 gcc_unreachable (); |
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326 } |
| 0 | 327 |
|
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328 |
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329 ptr = ggc_alloc_ssa_operand_memory_d (sizeof (void *) |
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330 + gimple_ssa_operands (cfun)->ssa_operand_mem_size); |
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331 |
| 0 | 332 ptr->next = gimple_ssa_operands (cfun)->operand_memory; |
| 333 gimple_ssa_operands (cfun)->operand_memory = ptr; | |
| 334 gimple_ssa_operands (cfun)->operand_memory_index = 0; | |
| 335 } | |
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336 |
| 0 | 337 ptr = &(gimple_ssa_operands (cfun)->operand_memory |
| 338 ->mem[gimple_ssa_operands (cfun)->operand_memory_index]); | |
| 339 gimple_ssa_operands (cfun)->operand_memory_index += size; | |
| 340 return ptr; | |
| 341 } | |
| 342 | |
| 343 | |
| 344 /* Allocate a DEF operand. */ | |
| 345 | |
| 346 static inline struct def_optype_d * | |
| 347 alloc_def (void) | |
| 348 { | |
| 349 struct def_optype_d *ret; | |
| 350 if (gimple_ssa_operands (cfun)->free_defs) | |
| 351 { | |
| 352 ret = gimple_ssa_operands (cfun)->free_defs; | |
| 353 gimple_ssa_operands (cfun)->free_defs | |
| 354 = gimple_ssa_operands (cfun)->free_defs->next; | |
| 355 } | |
| 356 else | |
| 357 ret = (struct def_optype_d *) | |
| 358 ssa_operand_alloc (sizeof (struct def_optype_d)); | |
| 359 return ret; | |
| 360 } | |
| 361 | |
| 362 | |
| 363 /* Allocate a USE operand. */ | |
| 364 | |
| 365 static inline struct use_optype_d * | |
| 366 alloc_use (void) | |
| 367 { | |
| 368 struct use_optype_d *ret; | |
| 369 if (gimple_ssa_operands (cfun)->free_uses) | |
| 370 { | |
| 371 ret = gimple_ssa_operands (cfun)->free_uses; | |
| 372 gimple_ssa_operands (cfun)->free_uses | |
| 373 = gimple_ssa_operands (cfun)->free_uses->next; | |
| 374 } | |
| 375 else | |
| 376 ret = (struct use_optype_d *) | |
| 377 ssa_operand_alloc (sizeof (struct use_optype_d)); | |
| 378 return ret; | |
| 379 } | |
| 380 | |
| 381 | |
| 382 /* Adds OP to the list of defs after LAST. */ | |
| 383 | |
|
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384 static inline def_optype_p |
| 0 | 385 add_def_op (tree *op, def_optype_p last) |
| 386 { | |
| 387 def_optype_p new_def; | |
| 388 | |
| 389 new_def = alloc_def (); | |
| 390 DEF_OP_PTR (new_def) = op; | |
| 391 last->next = new_def; | |
| 392 new_def->next = NULL; | |
| 393 return new_def; | |
| 394 } | |
| 395 | |
| 396 | |
| 397 /* Adds OP to the list of uses of statement STMT after LAST. */ | |
| 398 | |
| 399 static inline use_optype_p | |
| 400 add_use_op (gimple stmt, tree *op, use_optype_p last) | |
| 401 { | |
| 402 use_optype_p new_use; | |
| 403 | |
| 404 new_use = alloc_use (); | |
| 405 USE_OP_PTR (new_use)->use = op; | |
| 406 link_imm_use_stmt (USE_OP_PTR (new_use), *op, stmt); | |
| 407 last->next = new_use; | |
| 408 new_use->next = NULL; | |
| 409 return new_use; | |
| 410 } | |
| 411 | |
| 412 | |
| 413 | |
| 414 /* Takes elements from build_defs and turns them into def operands of STMT. | |
| 415 TODO -- Make build_defs VEC of tree *. */ | |
| 416 | |
| 417 static inline void | |
| 418 finalize_ssa_defs (gimple stmt) | |
| 419 { | |
| 420 unsigned new_i; | |
| 421 struct def_optype_d new_list; | |
| 422 def_optype_p old_ops, last; | |
| 423 unsigned int num = VEC_length (tree, build_defs); | |
| 424 | |
| 425 /* There should only be a single real definition per assignment. */ | |
| 426 gcc_assert ((stmt && gimple_code (stmt) != GIMPLE_ASSIGN) || num <= 1); | |
| 427 | |
|
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428 /* Pre-pend the vdef we may have built. */ |
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429 if (build_vdef != NULL_TREE) |
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430 { |
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431 tree oldvdef = gimple_vdef (stmt); |
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432 if (oldvdef |
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433 && TREE_CODE (oldvdef) == SSA_NAME) |
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434 oldvdef = SSA_NAME_VAR (oldvdef); |
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435 if (oldvdef != build_vdef) |
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436 gimple_set_vdef (stmt, build_vdef); |
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437 VEC_safe_insert (tree, heap, build_defs, 0, (tree)gimple_vdef_ptr (stmt)); |
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438 ++num; |
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439 } |
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440 |
| 0 | 441 new_list.next = NULL; |
| 442 last = &new_list; | |
| 443 | |
| 444 old_ops = gimple_def_ops (stmt); | |
| 445 | |
| 446 new_i = 0; | |
| 447 | |
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448 /* Clear and unlink a no longer necessary VDEF. */ |
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449 if (build_vdef == NULL_TREE |
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450 && gimple_vdef (stmt) != NULL_TREE) |
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451 { |
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452 if (TREE_CODE (gimple_vdef (stmt)) == SSA_NAME) |
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453 { |
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454 unlink_stmt_vdef (stmt); |
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455 release_ssa_name (gimple_vdef (stmt)); |
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456 } |
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457 gimple_set_vdef (stmt, NULL_TREE); |
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458 } |
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459 |
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460 /* If we have a non-SSA_NAME VDEF, mark it for renaming. */ |
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461 if (gimple_vdef (stmt) |
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462 && TREE_CODE (gimple_vdef (stmt)) != SSA_NAME) |
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463 mark_sym_for_renaming (gimple_vdef (stmt)); |
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464 |
| 0 | 465 /* Check for the common case of 1 def that hasn't changed. */ |
| 466 if (old_ops && old_ops->next == NULL && num == 1 | |
| 467 && (tree *) VEC_index (tree, build_defs, 0) == DEF_OP_PTR (old_ops)) | |
| 468 return; | |
| 469 | |
| 470 /* If there is anything in the old list, free it. */ | |
| 471 if (old_ops) | |
| 472 { | |
| 473 old_ops->next = gimple_ssa_operands (cfun)->free_defs; | |
| 474 gimple_ssa_operands (cfun)->free_defs = old_ops; | |
| 475 } | |
| 476 | |
| 477 /* If there is anything remaining in the build_defs list, simply emit it. */ | |
| 478 for ( ; new_i < num; new_i++) | |
| 479 last = add_def_op ((tree *) VEC_index (tree, build_defs, new_i), last); | |
| 480 | |
| 481 /* Now set the stmt's operands. */ | |
| 482 gimple_set_def_ops (stmt, new_list.next); | |
| 483 } | |
| 484 | |
| 485 | |
| 486 /* Takes elements from build_uses and turns them into use operands of STMT. | |
| 487 TODO -- Make build_uses VEC of tree *. */ | |
| 488 | |
| 489 static inline void | |
| 490 finalize_ssa_uses (gimple stmt) | |
| 491 { | |
| 492 unsigned new_i; | |
| 493 struct use_optype_d new_list; | |
| 494 use_optype_p old_ops, ptr, last; | |
| 495 | |
|
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496 /* Pre-pend the VUSE we may have built. */ |
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497 if (build_vuse != NULL_TREE) |
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498 { |
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499 tree oldvuse = gimple_vuse (stmt); |
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500 if (oldvuse |
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501 && TREE_CODE (oldvuse) == SSA_NAME) |
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502 oldvuse = SSA_NAME_VAR (oldvuse); |
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503 if (oldvuse != (build_vuse != NULL_TREE |
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504 ? build_vuse : build_vdef)) |
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505 gimple_set_vuse (stmt, NULL_TREE); |
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506 VEC_safe_insert (tree, heap, build_uses, 0, (tree)gimple_vuse_ptr (stmt)); |
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507 } |
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508 |
| 0 | 509 new_list.next = NULL; |
| 510 last = &new_list; | |
| 511 | |
| 512 old_ops = gimple_use_ops (stmt); | |
| 513 | |
|
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514 /* Clear a no longer necessary VUSE. */ |
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515 if (build_vuse == NULL_TREE |
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516 && gimple_vuse (stmt) != NULL_TREE) |
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517 gimple_set_vuse (stmt, NULL_TREE); |
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518 |
| 0 | 519 /* If there is anything in the old list, free it. */ |
| 520 if (old_ops) | |
| 521 { | |
| 522 for (ptr = old_ops; ptr; ptr = ptr->next) | |
| 523 delink_imm_use (USE_OP_PTR (ptr)); | |
| 524 old_ops->next = gimple_ssa_operands (cfun)->free_uses; | |
| 525 gimple_ssa_operands (cfun)->free_uses = old_ops; | |
| 526 } | |
| 527 | |
|
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528 /* If we added a VUSE, make sure to set the operand if it is not already |
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529 present and mark it for renaming. */ |
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530 if (build_vuse != NULL_TREE |
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531 && gimple_vuse (stmt) == NULL_TREE) |
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532 { |
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533 gimple_set_vuse (stmt, gimple_vop (cfun)); |
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534 mark_sym_for_renaming (gimple_vop (cfun)); |
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535 } |
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536 |
| 0 | 537 /* Now create nodes for all the new nodes. */ |
| 538 for (new_i = 0; new_i < VEC_length (tree, build_uses); new_i++) | |
|
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539 last = add_use_op (stmt, |
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540 (tree *) VEC_index (tree, build_uses, new_i), |
| 0 | 541 last); |
| 542 | |
| 543 /* Now set the stmt's operands. */ | |
| 544 gimple_set_use_ops (stmt, new_list.next); | |
| 545 } | |
| 546 | |
| 547 | |
| 548 /* Clear the in_list bits and empty the build array for VDEFs and | |
| 549 VUSEs. */ | |
| 550 | |
| 551 static inline void | |
| 552 cleanup_build_arrays (void) | |
| 553 { | |
|
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554 build_vdef = NULL_TREE; |
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555 build_vuse = NULL_TREE; |
| 0 | 556 VEC_truncate (tree, build_defs, 0); |
| 557 VEC_truncate (tree, build_uses, 0); | |
| 558 } | |
| 559 | |
| 560 | |
| 561 /* Finalize all the build vectors, fill the new ones into INFO. */ | |
|
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562 |
| 0 | 563 static inline void |
| 564 finalize_ssa_stmt_operands (gimple stmt) | |
| 565 { | |
| 566 finalize_ssa_defs (stmt); | |
| 567 finalize_ssa_uses (stmt); | |
| 568 cleanup_build_arrays (); | |
| 569 } | |
| 570 | |
| 571 | |
| 572 /* Start the process of building up operands vectors in INFO. */ | |
| 573 | |
| 574 static inline void | |
| 575 start_ssa_stmt_operands (void) | |
| 576 { | |
| 577 gcc_assert (VEC_length (tree, build_defs) == 0); | |
| 578 gcc_assert (VEC_length (tree, build_uses) == 0); | |
|
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579 gcc_assert (build_vuse == NULL_TREE); |
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580 gcc_assert (build_vdef == NULL_TREE); |
| 0 | 581 } |
| 582 | |
| 583 | |
| 584 /* Add DEF_P to the list of pointers to operands. */ | |
| 585 | |
| 586 static inline void | |
| 587 append_def (tree *def_p) | |
| 588 { | |
| 589 VEC_safe_push (tree, heap, build_defs, (tree) def_p); | |
| 590 } | |
| 591 | |
| 592 | |
| 593 /* Add USE_P to the list of pointers to operands. */ | |
| 594 | |
| 595 static inline void | |
| 596 append_use (tree *use_p) | |
| 597 { | |
| 598 VEC_safe_push (tree, heap, build_uses, (tree) use_p); | |
| 599 } | |
| 600 | |
| 601 | |
| 602 /* Add VAR to the set of variables that require a VDEF operator. */ | |
| 603 | |
| 604 static inline void | |
| 605 append_vdef (tree var) | |
| 606 { | |
|
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607 if (!optimize) |
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608 return; |
| 0 | 609 |
|
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610 gcc_assert ((build_vdef == NULL_TREE |
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611 || build_vdef == var) |
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612 && (build_vuse == NULL_TREE |
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613 || build_vuse == var)); |
| 0 | 614 |
|
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615 build_vdef = var; |
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616 build_vuse = var; |
| 0 | 617 } |
| 618 | |
| 619 | |
| 620 /* Add VAR to the set of variables that require a VUSE operator. */ | |
| 621 | |
| 622 static inline void | |
| 623 append_vuse (tree var) | |
| 624 { | |
|
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625 if (!optimize) |
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626 return; |
| 0 | 627 |
|
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628 gcc_assert (build_vuse == NULL_TREE |
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629 || build_vuse == var); |
| 0 | 630 |
|
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631 build_vuse = var; |
| 0 | 632 } |
| 633 | |
|
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634 /* Add virtual operands for STMT. FLAGS is as in get_expr_operands. */ |
| 0 | 635 |
| 636 static void | |
|
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637 add_virtual_operand (gimple stmt ATTRIBUTE_UNUSED, int flags) |
| 0 | 638 { |
|
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639 /* Add virtual operands to the stmt, unless the caller has specifically |
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640 requested not to do that (used when adding operands inside an |
| 0 | 641 ADDR_EXPR expression). */ |
| 642 if (flags & opf_no_vops) | |
| 643 return; | |
| 644 | |
|
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645 gcc_assert (!is_gimple_debug (stmt)); |
| 0 | 646 |
|
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647 if (flags & opf_def) |
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648 append_vdef (gimple_vop (cfun)); |
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649 else |
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650 append_vuse (gimple_vop (cfun)); |
| 0 | 651 } |
| 652 | |
| 653 | |
| 654 /* Add *VAR_P to the appropriate operand array for statement STMT. | |
| 655 FLAGS is as in get_expr_operands. If *VAR_P is a GIMPLE register, | |
| 656 it will be added to the statement's real operands, otherwise it is | |
| 657 added to virtual operands. */ | |
| 658 | |
| 659 static void | |
| 660 add_stmt_operand (tree *var_p, gimple stmt, int flags) | |
| 661 { | |
| 662 tree var, sym; | |
| 663 | |
| 664 gcc_assert (SSA_VAR_P (*var_p)); | |
| 665 | |
| 666 var = *var_p; | |
| 667 sym = (TREE_CODE (var) == SSA_NAME ? SSA_NAME_VAR (var) : var); | |
| 668 | |
| 669 /* Mark statements with volatile operands. */ | |
| 670 if (TREE_THIS_VOLATILE (sym)) | |
| 671 gimple_set_has_volatile_ops (stmt, true); | |
| 672 | |
| 673 if (is_gimple_reg (sym)) | |
| 674 { | |
| 675 /* The variable is a GIMPLE register. Add it to real operands. */ | |
| 676 if (flags & opf_def) | |
| 677 append_def (var_p); | |
| 678 else | |
| 679 append_use (var_p); | |
| 680 } | |
| 681 else | |
|
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682 add_virtual_operand (stmt, flags); |
| 0 | 683 } |
| 684 | |
|
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685 /* Mark the base address of REF as having its address taken. |
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686 REF may be a single variable whose address has been taken or any |
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687 other valid GIMPLE memory reference (structure reference, array, |
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688 etc). */ |
| 0 | 689 |
| 690 static void | |
|
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691 mark_address_taken (tree ref) |
| 0 | 692 { |
|
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693 tree var; |
| 0 | 694 |
|
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695 /* Note that it is *NOT OKAY* to use the target of a COMPONENT_REF |
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696 as the only thing we take the address of. If VAR is a structure, |
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697 taking the address of a field means that the whole structure may |
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698 be referenced using pointer arithmetic. See PR 21407 and the |
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699 ensuing mailing list discussion. */ |
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700 var = get_base_address (ref); |
|
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701 if (var) |
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702 { |
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703 if (DECL_P (var)) |
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704 TREE_ADDRESSABLE (var) = 1; |
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705 else if (TREE_CODE (var) == MEM_REF |
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706 && TREE_CODE (TREE_OPERAND (var, 0)) == ADDR_EXPR |
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707 && DECL_P (TREE_OPERAND (TREE_OPERAND (var, 0), 0))) |
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708 TREE_ADDRESSABLE (TREE_OPERAND (TREE_OPERAND (var, 0), 0)) = 1; |
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709 } |
| 0 | 710 } |
| 711 | |
| 712 | |
|
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713 /* A subroutine of get_expr_operands to handle MEM_REF. |
| 0 | 714 |
|
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715 STMT is the statement being processed, EXPR is the MEM_REF |
| 0 | 716 that got us here. |
|
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717 |
| 0 | 718 FLAGS is as in get_expr_operands. |
| 719 | |
| 720 RECURSE_ON_BASE should be set to true if we want to continue | |
| 721 calling get_expr_operands on the base pointer, and false if | |
| 722 something else will do it for us. */ | |
| 723 | |
| 724 static void | |
|
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725 get_indirect_ref_operands (gimple stmt, tree expr, int flags, |
| 0 | 726 bool recurse_on_base) |
| 727 { | |
| 728 tree *pptr = &TREE_OPERAND (expr, 0); | |
| 729 | |
| 730 if (TREE_THIS_VOLATILE (expr)) | |
| 731 gimple_set_has_volatile_ops (stmt, true); | |
| 732 | |
|
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733 /* Add the VOP. */ |
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734 add_virtual_operand (stmt, flags); |
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735 |
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736 /* If requested, add a USE operand for the base pointer. */ |
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737 if (recurse_on_base) |
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738 get_expr_operands (stmt, pptr, |
|
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739 opf_non_addressable | opf_use |
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740 | (flags & (opf_no_vops|opf_not_non_addressable))); |
| 0 | 741 } |
| 742 | |
| 743 | |
| 744 /* A subroutine of get_expr_operands to handle TARGET_MEM_REF. */ | |
| 745 | |
| 746 static void | |
| 747 get_tmr_operands (gimple stmt, tree expr, int flags) | |
| 748 { | |
|
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749 if (TREE_THIS_VOLATILE (expr)) |
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750 gimple_set_has_volatile_ops (stmt, true); |
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751 |
| 0 | 752 /* First record the real operands. */ |
|
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753 get_expr_operands (stmt, &TMR_BASE (expr), opf_use | (flags & opf_no_vops)); |
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754 get_expr_operands (stmt, &TMR_INDEX (expr), opf_use | (flags & opf_no_vops)); |
|
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755 get_expr_operands (stmt, &TMR_INDEX2 (expr), opf_use | (flags & opf_no_vops)); |
| 0 | 756 |
|
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757 add_virtual_operand (stmt, flags); |
| 0 | 758 } |
| 759 | |
| 760 | |
| 761 /* If STMT is a call that may clobber globals and other symbols that | |
| 762 escape, add them to the VDEF/VUSE lists for it. */ | |
| 763 | |
| 764 static void | |
|
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765 maybe_add_call_vops (gimple stmt) |
| 0 | 766 { |
| 767 int call_flags = gimple_call_flags (stmt); | |
| 768 | |
| 769 /* If aliases have been computed already, add VDEF or VUSE | |
| 770 operands for all the symbols that have been found to be | |
| 771 call-clobbered. */ | |
|
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772 if (!(call_flags & ECF_NOVOPS)) |
| 0 | 773 { |
|
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774 /* A 'pure' or a 'const' function never call-clobbers anything. |
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775 A 'noreturn' function might, but since we don't return anyway |
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776 there is no point in recording that. */ |
| 0 | 777 if (!(call_flags & (ECF_PURE | ECF_CONST | ECF_NORETURN))) |
|
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778 add_virtual_operand (stmt, opf_def); |
| 0 | 779 else if (!(call_flags & ECF_CONST)) |
|
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780 add_virtual_operand (stmt, opf_use); |
| 0 | 781 } |
| 782 } | |
| 783 | |
| 784 | |
| 785 /* Scan operands in the ASM_EXPR stmt referred to in INFO. */ | |
| 786 | |
| 787 static void | |
| 788 get_asm_expr_operands (gimple stmt) | |
| 789 { | |
| 790 size_t i, noutputs; | |
| 791 const char **oconstraints; | |
| 792 const char *constraint; | |
| 793 bool allows_mem, allows_reg, is_inout; | |
| 794 | |
| 795 noutputs = gimple_asm_noutputs (stmt); | |
| 796 oconstraints = (const char **) alloca ((noutputs) * sizeof (const char *)); | |
| 797 | |
| 798 /* Gather all output operands. */ | |
| 799 for (i = 0; i < gimple_asm_noutputs (stmt); i++) | |
| 800 { | |
| 801 tree link = gimple_asm_output_op (stmt, i); | |
| 802 constraint = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link))); | |
| 803 oconstraints[i] = constraint; | |
| 804 parse_output_constraint (&constraint, i, 0, 0, &allows_mem, | |
| 805 &allows_reg, &is_inout); | |
| 806 | |
| 807 /* This should have been split in gimplify_asm_expr. */ | |
| 808 gcc_assert (!allows_reg || !is_inout); | |
| 809 | |
| 810 /* Memory operands are addressable. Note that STMT needs the | |
| 811 address of this operand. */ | |
| 812 if (!allows_reg && allows_mem) | |
|
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813 mark_address_taken (TREE_VALUE (link)); |
| 0 | 814 |
|
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815 get_expr_operands (stmt, &TREE_VALUE (link), opf_def | opf_not_non_addressable); |
| 0 | 816 } |
| 817 | |
| 818 /* Gather all input operands. */ | |
| 819 for (i = 0; i < gimple_asm_ninputs (stmt); i++) | |
| 820 { | |
| 821 tree link = gimple_asm_input_op (stmt, i); | |
| 822 constraint = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link))); | |
| 823 parse_input_constraint (&constraint, 0, 0, noutputs, 0, oconstraints, | |
| 824 &allows_mem, &allows_reg); | |
| 825 | |
| 826 /* Memory operands are addressable. Note that STMT needs the | |
| 827 address of this operand. */ | |
| 828 if (!allows_reg && allows_mem) | |
|
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829 mark_address_taken (TREE_VALUE (link)); |
| 0 | 830 |
|
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831 get_expr_operands (stmt, &TREE_VALUE (link), opf_not_non_addressable); |
| 0 | 832 } |
| 833 | |
| 834 /* Clobber all memory and addressable symbols for asm ("" : : : "memory"); */ | |
| 835 for (i = 0; i < gimple_asm_nclobbers (stmt); i++) | |
| 836 { | |
| 837 tree link = gimple_asm_clobber_op (stmt, i); | |
| 838 if (strcmp (TREE_STRING_POINTER (TREE_VALUE (link)), "memory") == 0) | |
| 839 { | |
|
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840 add_virtual_operand (stmt, opf_def); |
| 0 | 841 break; |
| 842 } | |
| 843 } | |
| 844 } | |
| 845 | |
| 846 | |
| 847 /* Recursively scan the expression pointed to by EXPR_P in statement | |
| 848 STMT. FLAGS is one of the OPF_* constants modifying how to | |
| 849 interpret the operands found. */ | |
| 850 | |
| 851 static void | |
| 852 get_expr_operands (gimple stmt, tree *expr_p, int flags) | |
| 853 { | |
| 854 enum tree_code code; | |
| 855 enum tree_code_class codeclass; | |
| 856 tree expr = *expr_p; | |
|
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857 int uflags = opf_use; |
| 0 | 858 |
| 859 if (expr == NULL) | |
| 860 return; | |
| 861 | |
|
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862 if (is_gimple_debug (stmt)) |
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863 uflags |= (flags & opf_no_vops); |
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864 |
| 0 | 865 code = TREE_CODE (expr); |
| 866 codeclass = TREE_CODE_CLASS (code); | |
| 867 | |
| 868 switch (code) | |
| 869 { | |
| 870 case ADDR_EXPR: | |
| 871 /* Taking the address of a variable does not represent a | |
| 872 reference to it, but the fact that the statement takes its | |
| 873 address will be of interest to some passes (e.g. alias | |
| 874 resolution). */ | |
|
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875 if ((!(flags & opf_non_addressable) |
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876 || (flags & opf_not_non_addressable)) |
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877 && !is_gimple_debug (stmt)) |
|
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878 mark_address_taken (TREE_OPERAND (expr, 0)); |
| 0 | 879 |
| 880 /* If the address is invariant, there may be no interesting | |
| 881 variable references inside. */ | |
| 882 if (is_gimple_min_invariant (expr)) | |
| 883 return; | |
| 884 | |
| 885 /* Otherwise, there may be variables referenced inside but there | |
| 886 should be no VUSEs created, since the referenced objects are | |
| 887 not really accessed. The only operands that we should find | |
| 888 here are ARRAY_REF indices which will always be real operands | |
| 889 (GIMPLE does not allow non-registers as array indices). */ | |
| 890 flags |= opf_no_vops; | |
|
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891 get_expr_operands (stmt, &TREE_OPERAND (expr, 0), |
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892 flags | opf_not_non_addressable); |
| 0 | 893 return; |
| 894 | |
| 895 case SSA_NAME: | |
| 896 add_stmt_operand (expr_p, stmt, flags); | |
| 897 return; | |
| 898 | |
| 899 case VAR_DECL: | |
| 900 case PARM_DECL: | |
| 901 case RESULT_DECL: | |
| 902 add_stmt_operand (expr_p, stmt, flags); | |
| 903 return; | |
| 904 | |
|
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905 case DEBUG_EXPR_DECL: |
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906 gcc_assert (gimple_debug_bind_p (stmt)); |
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907 return; |
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908 |
|
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909 case MEM_REF: |
|
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910 get_indirect_ref_operands (stmt, expr, flags, true); |
| 0 | 911 return; |
| 912 | |
| 913 case TARGET_MEM_REF: | |
| 914 get_tmr_operands (stmt, expr, flags); | |
| 915 return; | |
| 916 | |
| 917 case ARRAY_REF: | |
| 918 case ARRAY_RANGE_REF: | |
| 919 case COMPONENT_REF: | |
| 920 case REALPART_EXPR: | |
| 921 case IMAGPART_EXPR: | |
| 922 { | |
| 923 if (TREE_THIS_VOLATILE (expr)) | |
| 924 gimple_set_has_volatile_ops (stmt, true); | |
| 925 | |
|
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926 get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags); |
| 0 | 927 |
| 928 if (code == COMPONENT_REF) | |
| 929 { | |
| 930 if (TREE_THIS_VOLATILE (TREE_OPERAND (expr, 1))) | |
| 931 gimple_set_has_volatile_ops (stmt, true); | |
|
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932 get_expr_operands (stmt, &TREE_OPERAND (expr, 2), uflags); |
| 0 | 933 } |
| 934 else if (code == ARRAY_REF || code == ARRAY_RANGE_REF) | |
| 935 { | |
|
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936 get_expr_operands (stmt, &TREE_OPERAND (expr, 1), uflags); |
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937 get_expr_operands (stmt, &TREE_OPERAND (expr, 2), uflags); |
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938 get_expr_operands (stmt, &TREE_OPERAND (expr, 3), uflags); |
| 0 | 939 } |
| 940 | |
| 941 return; | |
| 942 } | |
| 943 | |
| 944 case WITH_SIZE_EXPR: | |
| 945 /* WITH_SIZE_EXPR is a pass-through reference to its first argument, | |
| 946 and an rvalue reference to its second argument. */ | |
|
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947 get_expr_operands (stmt, &TREE_OPERAND (expr, 1), uflags); |
| 0 | 948 get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags); |
| 949 return; | |
| 950 | |
| 951 case COND_EXPR: | |
| 952 case VEC_COND_EXPR: | |
|
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953 get_expr_operands (stmt, &TREE_OPERAND (expr, 0), uflags); |
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954 get_expr_operands (stmt, &TREE_OPERAND (expr, 1), uflags); |
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|
955 get_expr_operands (stmt, &TREE_OPERAND (expr, 2), uflags); |
| 0 | 956 return; |
| 957 | |
| 958 case CONSTRUCTOR: | |
| 959 { | |
| 960 /* General aggregate CONSTRUCTORs have been decomposed, but they | |
| 961 are still in use as the COMPLEX_EXPR equivalent for vectors. */ | |
| 962 constructor_elt *ce; | |
| 963 unsigned HOST_WIDE_INT idx; | |
| 964 | |
| 965 for (idx = 0; | |
| 966 VEC_iterate (constructor_elt, CONSTRUCTOR_ELTS (expr), idx, ce); | |
| 967 idx++) | |
|
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968 get_expr_operands (stmt, &ce->value, uflags); |
| 0 | 969 |
| 970 return; | |
| 971 } | |
| 972 | |
| 973 case BIT_FIELD_REF: | |
| 974 if (TREE_THIS_VOLATILE (expr)) | |
| 975 gimple_set_has_volatile_ops (stmt, true); | |
| 976 /* FALLTHRU */ | |
| 977 | |
| 978 case TRUTH_NOT_EXPR: | |
| 979 case VIEW_CONVERT_EXPR: | |
| 980 do_unary: | |
| 981 get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags); | |
| 982 return; | |
| 983 | |
| 984 case TRUTH_AND_EXPR: | |
| 985 case TRUTH_OR_EXPR: | |
| 986 case TRUTH_XOR_EXPR: | |
| 987 case COMPOUND_EXPR: | |
| 988 case OBJ_TYPE_REF: | |
| 989 case ASSERT_EXPR: | |
| 990 do_binary: | |
| 991 { | |
| 992 get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags); | |
| 993 get_expr_operands (stmt, &TREE_OPERAND (expr, 1), flags); | |
| 994 return; | |
| 995 } | |
| 996 | |
| 997 case DOT_PROD_EXPR: | |
| 998 case REALIGN_LOAD_EXPR: | |
|
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999 case WIDEN_MULT_PLUS_EXPR: |
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1000 case WIDEN_MULT_MINUS_EXPR: |
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1001 case FMA_EXPR: |
| 0 | 1002 { |
| 1003 get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags); | |
|
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1004 get_expr_operands (stmt, &TREE_OPERAND (expr, 1), flags); |
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1005 get_expr_operands (stmt, &TREE_OPERAND (expr, 2), flags); |
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1006 return; |
| 0 | 1007 } |
| 1008 | |
| 1009 case FUNCTION_DECL: | |
| 1010 case LABEL_DECL: | |
| 1011 case CONST_DECL: | |
| 1012 case CASE_LABEL_EXPR: | |
| 1013 /* Expressions that make no memory references. */ | |
| 1014 return; | |
| 1015 | |
| 1016 default: | |
| 1017 if (codeclass == tcc_unary) | |
| 1018 goto do_unary; | |
| 1019 if (codeclass == tcc_binary || codeclass == tcc_comparison) | |
| 1020 goto do_binary; | |
| 1021 if (codeclass == tcc_constant || codeclass == tcc_type) | |
| 1022 return; | |
| 1023 } | |
| 1024 | |
| 1025 /* If we get here, something has gone wrong. */ | |
| 1026 #ifdef ENABLE_CHECKING | |
| 1027 fprintf (stderr, "unhandled expression in get_expr_operands():\n"); | |
| 1028 debug_tree (expr); | |
| 1029 fputs ("\n", stderr); | |
| 1030 #endif | |
| 1031 gcc_unreachable (); | |
| 1032 } | |
| 1033 | |
| 1034 | |
| 1035 /* Parse STMT looking for operands. When finished, the various | |
| 1036 build_* operand vectors will have potential operands in them. */ | |
| 1037 | |
| 1038 static void | |
| 1039 parse_ssa_operands (gimple stmt) | |
| 1040 { | |
| 1041 enum gimple_code code = gimple_code (stmt); | |
| 1042 | |
| 1043 if (code == GIMPLE_ASM) | |
| 1044 get_asm_expr_operands (stmt); | |
|
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1045 else if (is_gimple_debug (stmt)) |
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1046 { |
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1047 if (gimple_debug_bind_p (stmt) |
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1048 && gimple_debug_bind_has_value_p (stmt)) |
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1049 get_expr_operands (stmt, gimple_debug_bind_get_value_ptr (stmt), |
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1050 opf_use | opf_no_vops); |
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1051 } |
| 0 | 1052 else |
| 1053 { | |
| 1054 size_t i, start = 0; | |
| 1055 | |
| 1056 if (code == GIMPLE_ASSIGN || code == GIMPLE_CALL) | |
| 1057 { | |
| 1058 get_expr_operands (stmt, gimple_op_ptr (stmt, 0), opf_def); | |
| 1059 start = 1; | |
| 1060 } | |
| 1061 | |
| 1062 for (i = start; i < gimple_num_ops (stmt); i++) | |
| 1063 get_expr_operands (stmt, gimple_op_ptr (stmt, i), opf_use); | |
| 1064 | |
| 1065 /* Add call-clobbered operands, if needed. */ | |
| 1066 if (code == GIMPLE_CALL) | |
|
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1067 maybe_add_call_vops (stmt); |
| 0 | 1068 } |
| 1069 } | |
| 1070 | |
| 1071 | |
| 1072 /* Create an operands cache for STMT. */ | |
| 1073 | |
| 1074 static void | |
| 1075 build_ssa_operands (gimple stmt) | |
| 1076 { | |
|
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1077 /* Initially assume that the statement has no volatile operands. */ |
| 0 | 1078 gimple_set_has_volatile_ops (stmt, false); |
| 1079 | |
| 1080 start_ssa_stmt_operands (); | |
| 1081 parse_ssa_operands (stmt); | |
| 1082 finalize_ssa_stmt_operands (stmt); | |
| 1083 } | |
| 1084 | |
| 1085 | |
| 1086 /* Releases the operands of STMT back to their freelists, and clears | |
| 1087 the stmt operand lists. */ | |
| 1088 | |
| 1089 void | |
| 1090 free_stmt_operands (gimple stmt) | |
| 1091 { | |
| 1092 def_optype_p defs = gimple_def_ops (stmt), last_def; | |
| 1093 use_optype_p uses = gimple_use_ops (stmt), last_use; | |
| 1094 | |
| 1095 if (defs) | |
| 1096 { | |
| 1097 for (last_def = defs; last_def->next; last_def = last_def->next) | |
| 1098 continue; | |
| 1099 last_def->next = gimple_ssa_operands (cfun)->free_defs; | |
| 1100 gimple_ssa_operands (cfun)->free_defs = defs; | |
| 1101 gimple_set_def_ops (stmt, NULL); | |
| 1102 } | |
| 1103 | |
| 1104 if (uses) | |
| 1105 { | |
| 1106 for (last_use = uses; last_use->next; last_use = last_use->next) | |
| 1107 delink_imm_use (USE_OP_PTR (last_use)); | |
| 1108 delink_imm_use (USE_OP_PTR (last_use)); | |
| 1109 last_use->next = gimple_ssa_operands (cfun)->free_uses; | |
| 1110 gimple_ssa_operands (cfun)->free_uses = uses; | |
| 1111 gimple_set_use_ops (stmt, NULL); | |
| 1112 } | |
| 1113 | |
| 1114 if (gimple_has_mem_ops (stmt)) | |
| 1115 { | |
|
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|
1116 gimple_set_vuse (stmt, NULL_TREE); |
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1117 gimple_set_vdef (stmt, NULL_TREE); |
| 0 | 1118 } |
| 1119 } | |
| 1120 | |
| 1121 | |
| 1122 /* Get the operands of statement STMT. */ | |
| 1123 | |
| 1124 void | |
| 1125 update_stmt_operands (gimple stmt) | |
| 1126 { | |
| 1127 /* If update_stmt_operands is called before SSA is initialized, do | |
| 1128 nothing. */ | |
| 1129 if (!ssa_operands_active ()) | |
| 1130 return; | |
| 1131 | |
| 1132 timevar_push (TV_TREE_OPS); | |
| 1133 | |
| 1134 gcc_assert (gimple_modified_p (stmt)); | |
| 1135 build_ssa_operands (stmt); | |
| 1136 gimple_set_modified (stmt, false); | |
| 1137 | |
| 1138 timevar_pop (TV_TREE_OPS); | |
| 1139 } | |
| 1140 | |
| 1141 | |
| 1142 /* Swap operands EXP0 and EXP1 in statement STMT. No attempt is done | |
| 1143 to test the validity of the swap operation. */ | |
| 1144 | |
| 1145 void | |
| 1146 swap_tree_operands (gimple stmt, tree *exp0, tree *exp1) | |
| 1147 { | |
| 1148 tree op0, op1; | |
| 1149 op0 = *exp0; | |
| 1150 op1 = *exp1; | |
| 1151 | |
| 1152 /* If the operand cache is active, attempt to preserve the relative | |
| 1153 positions of these two operands in their respective immediate use | |
| 1154 lists. */ | |
| 1155 if (ssa_operands_active () && op0 != op1) | |
| 1156 { | |
| 1157 use_optype_p use0, use1, ptr; | |
| 1158 use0 = use1 = NULL; | |
| 1159 | |
| 1160 /* Find the 2 operands in the cache, if they are there. */ | |
| 1161 for (ptr = gimple_use_ops (stmt); ptr; ptr = ptr->next) | |
| 1162 if (USE_OP_PTR (ptr)->use == exp0) | |
| 1163 { | |
| 1164 use0 = ptr; | |
| 1165 break; | |
| 1166 } | |
| 1167 | |
| 1168 for (ptr = gimple_use_ops (stmt); ptr; ptr = ptr->next) | |
| 1169 if (USE_OP_PTR (ptr)->use == exp1) | |
| 1170 { | |
| 1171 use1 = ptr; | |
| 1172 break; | |
| 1173 } | |
| 1174 | |
| 1175 /* If both uses don't have operand entries, there isn't much we can do | |
| 1176 at this point. Presumably we don't need to worry about it. */ | |
| 1177 if (use0 && use1) | |
| 1178 { | |
| 1179 tree *tmp = USE_OP_PTR (use1)->use; | |
| 1180 USE_OP_PTR (use1)->use = USE_OP_PTR (use0)->use; | |
| 1181 USE_OP_PTR (use0)->use = tmp; | |
| 1182 } | |
| 1183 } | |
| 1184 | |
| 1185 /* Now swap the data. */ | |
| 1186 *exp0 = op1; | |
| 1187 *exp1 = op0; | |
| 1188 } | |
| 1189 | |
| 1190 | |
| 1191 /* Scan the immediate_use list for VAR making sure its linked properly. | |
| 1192 Return TRUE if there is a problem and emit an error message to F. */ | |
| 1193 | |
|
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|
1194 DEBUG_FUNCTION bool |
| 0 | 1195 verify_imm_links (FILE *f, tree var) |
| 1196 { | |
| 1197 use_operand_p ptr, prev, list; | |
| 1198 int count; | |
| 1199 | |
| 1200 gcc_assert (TREE_CODE (var) == SSA_NAME); | |
| 1201 | |
| 1202 list = &(SSA_NAME_IMM_USE_NODE (var)); | |
| 1203 gcc_assert (list->use == NULL); | |
| 1204 | |
| 1205 if (list->prev == NULL) | |
| 1206 { | |
| 1207 gcc_assert (list->next == NULL); | |
| 1208 return false; | |
| 1209 } | |
| 1210 | |
| 1211 prev = list; | |
| 1212 count = 0; | |
| 1213 for (ptr = list->next; ptr != list; ) | |
| 1214 { | |
| 1215 if (prev != ptr->prev) | |
| 1216 goto error; | |
|
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1217 |
| 0 | 1218 if (ptr->use == NULL) |
| 1219 goto error; /* 2 roots, or SAFE guard node. */ | |
| 1220 else if (*(ptr->use) != var) | |
| 1221 goto error; | |
| 1222 | |
| 1223 prev = ptr; | |
| 1224 ptr = ptr->next; | |
| 1225 | |
| 1226 /* Avoid infinite loops. 50,000,000 uses probably indicates a | |
| 1227 problem. */ | |
| 1228 if (count++ > 50000000) | |
| 1229 goto error; | |
| 1230 } | |
| 1231 | |
| 1232 /* Verify list in the other direction. */ | |
| 1233 prev = list; | |
| 1234 for (ptr = list->prev; ptr != list; ) | |
| 1235 { | |
| 1236 if (prev != ptr->next) | |
| 1237 goto error; | |
| 1238 prev = ptr; | |
| 1239 ptr = ptr->prev; | |
| 1240 if (count-- < 0) | |
| 1241 goto error; | |
| 1242 } | |
| 1243 | |
| 1244 if (count != 0) | |
| 1245 goto error; | |
| 1246 | |
| 1247 return false; | |
| 1248 | |
| 1249 error: | |
| 1250 if (ptr->loc.stmt && gimple_modified_p (ptr->loc.stmt)) | |
| 1251 { | |
| 1252 fprintf (f, " STMT MODIFIED. - <%p> ", (void *)ptr->loc.stmt); | |
| 1253 print_gimple_stmt (f, ptr->loc.stmt, 0, TDF_SLIM); | |
| 1254 } | |
|
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|
1255 fprintf (f, " IMM ERROR : (use_p : tree - %p:%p)", (void *)ptr, |
| 0 | 1256 (void *)ptr->use); |
| 1257 print_generic_expr (f, USE_FROM_PTR (ptr), TDF_SLIM); | |
| 1258 fprintf(f, "\n"); | |
| 1259 return true; | |
| 1260 } | |
| 1261 | |
| 1262 | |
| 1263 /* Dump all the immediate uses to FILE. */ | |
| 1264 | |
| 1265 void | |
| 1266 dump_immediate_uses_for (FILE *file, tree var) | |
| 1267 { | |
| 1268 imm_use_iterator iter; | |
| 1269 use_operand_p use_p; | |
| 1270 | |
| 1271 gcc_assert (var && TREE_CODE (var) == SSA_NAME); | |
| 1272 | |
| 1273 print_generic_expr (file, var, TDF_SLIM); | |
| 1274 fprintf (file, " : -->"); | |
| 1275 if (has_zero_uses (var)) | |
| 1276 fprintf (file, " no uses.\n"); | |
| 1277 else | |
| 1278 if (has_single_use (var)) | |
| 1279 fprintf (file, " single use.\n"); | |
| 1280 else | |
| 1281 fprintf (file, "%d uses.\n", num_imm_uses (var)); | |
| 1282 | |
| 1283 FOR_EACH_IMM_USE_FAST (use_p, iter, var) | |
| 1284 { | |
| 1285 if (use_p->loc.stmt == NULL && use_p->use == NULL) | |
| 1286 fprintf (file, "***end of stmt iterator marker***\n"); | |
| 1287 else | |
| 1288 if (!is_gimple_reg (USE_FROM_PTR (use_p))) | |
| 1289 print_gimple_stmt (file, USE_STMT (use_p), 0, TDF_VOPS|TDF_MEMSYMS); | |
| 1290 else | |
| 1291 print_gimple_stmt (file, USE_STMT (use_p), 0, TDF_SLIM); | |
| 1292 } | |
| 1293 fprintf(file, "\n"); | |
| 1294 } | |
| 1295 | |
| 1296 | |
| 1297 /* Dump all the immediate uses to FILE. */ | |
| 1298 | |
| 1299 void | |
| 1300 dump_immediate_uses (FILE *file) | |
| 1301 { | |
| 1302 tree var; | |
| 1303 unsigned int x; | |
| 1304 | |
| 1305 fprintf (file, "Immediate_uses: \n\n"); | |
| 1306 for (x = 1; x < num_ssa_names; x++) | |
| 1307 { | |
| 1308 var = ssa_name(x); | |
| 1309 if (!var) | |
| 1310 continue; | |
| 1311 dump_immediate_uses_for (file, var); | |
| 1312 } | |
| 1313 } | |
| 1314 | |
| 1315 | |
| 1316 /* Dump def-use edges on stderr. */ | |
| 1317 | |
|
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|
1318 DEBUG_FUNCTION void |
| 0 | 1319 debug_immediate_uses (void) |
| 1320 { | |
| 1321 dump_immediate_uses (stderr); | |
| 1322 } | |
| 1323 | |
| 1324 | |
| 1325 /* Dump def-use edges on stderr. */ | |
| 1326 | |
|
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|
1327 DEBUG_FUNCTION void |
| 0 | 1328 debug_immediate_uses_for (tree var) |
| 1329 { | |
| 1330 dump_immediate_uses_for (stderr, var); | |
| 1331 } | |
| 1332 | |
| 1333 | |
|
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1334 /* Unlink STMTs virtual definition from the IL by propagating its use. */ |
| 0 | 1335 |
| 1336 void | |
|
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1337 unlink_stmt_vdef (gimple stmt) |
| 0 | 1338 { |
|
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1339 use_operand_p use_p; |
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1340 imm_use_iterator iter; |
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1341 gimple use_stmt; |
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1342 tree vdef = gimple_vdef (stmt); |
| 0 | 1343 |
|
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1344 if (!vdef |
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1345 || TREE_CODE (vdef) != SSA_NAME) |
| 0 | 1346 return; |
| 1347 | |
|
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1348 FOR_EACH_IMM_USE_STMT (use_stmt, iter, gimple_vdef (stmt)) |
| 0 | 1349 { |
|
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1350 FOR_EACH_IMM_USE_ON_STMT (use_p, iter) |
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1351 SET_USE (use_p, gimple_vuse (stmt)); |
| 0 | 1352 } |
| 1353 | |
|
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1354 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
|
1355 SSA_NAME_OCCURS_IN_ABNORMAL_PHI (gimple_vuse (stmt)) = 1; |
| 0 | 1356 } |
| 1357 |