Mercurial > hg > CbC > CbC_gcc
annotate gcc/tree-ssa-operands.c @ 55:77e2b8dfacca gcc-4.4.5
update it from 4.4.3 to 4.5.0
| author | ryoma <e075725@ie.u-ryukyu.ac.jp> |
|---|---|
| date | Fri, 12 Feb 2010 23:39:51 +0900 |
| parents | 58ad6c70ea60 |
| children | 326d9e06c2e3 b7f97abdc517 |
| rev | line source |
|---|---|
| 0 | 1 /* SSA operands management for trees. |
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2 Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 |
| 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" | |
| 28 #include "diagnostic.h" | |
| 29 #include "tree-flow.h" | |
| 30 #include "tree-inline.h" | |
| 31 #include "tree-pass.h" | |
| 32 #include "ggc.h" | |
| 33 #include "timevar.h" | |
| 34 #include "toplev.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 | |
| 129 /* Array for building all the def operands. */ | |
| 130 static VEC(tree,heap) *build_defs; | |
| 131 | |
| 132 /* Array for building all the use operands. */ | |
| 133 static VEC(tree,heap) *build_uses; | |
| 134 | |
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135 /* The built VDEF operand. */ |
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136 static tree build_vdef; |
| 0 | 137 |
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138 /* The built VUSE operand. */ |
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139 static tree build_vuse; |
| 0 | 140 |
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141 /* Bitmap obstack for our datastructures that needs to survive across |
| 0 | 142 compilations of multiple functions. */ |
| 143 static bitmap_obstack operands_bitmap_obstack; | |
| 144 | |
| 145 static void get_expr_operands (gimple, tree *, int); | |
| 146 | |
| 147 /* Number of functions with initialized ssa_operands. */ | |
| 148 static int n_initialized = 0; | |
| 149 | |
| 150 /* Return the DECL_UID of the base variable of T. */ | |
| 151 | |
| 152 static inline unsigned | |
| 153 get_name_decl (const_tree t) | |
| 154 { | |
| 155 if (TREE_CODE (t) != SSA_NAME) | |
| 156 return DECL_UID (t); | |
| 157 else | |
| 158 return DECL_UID (SSA_NAME_VAR (t)); | |
| 159 } | |
| 160 | |
| 161 | |
| 162 /* Return true if the SSA operands cache is active. */ | |
| 163 | |
| 164 bool | |
| 165 ssa_operands_active (void) | |
| 166 { | |
| 167 /* This function may be invoked from contexts where CFUN is NULL | |
| 168 (IPA passes), return false for now. FIXME: operands may be | |
| 169 active in each individual function, maybe this function should | |
| 170 take CFUN as a parameter. */ | |
| 171 if (cfun == NULL) | |
| 172 return false; | |
| 173 | |
| 174 return cfun->gimple_df && gimple_ssa_operands (cfun)->ops_active; | |
| 175 } | |
| 176 | |
| 177 | |
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178 /* Create the VOP variable, an artificial global variable to act as a |
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179 representative of all of the virtual operands FUD chain. */ |
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180 |
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181 static void |
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182 create_vop_var (void) |
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183 { |
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184 tree global_var; |
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185 |
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186 gcc_assert (cfun->gimple_df->vop == NULL_TREE); |
| 0 | 187 |
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188 global_var = build_decl (BUILTINS_LOCATION, VAR_DECL, |
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189 get_identifier (".MEM"), |
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190 void_type_node); |
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191 DECL_ARTIFICIAL (global_var) = 1; |
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192 TREE_READONLY (global_var) = 0; |
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193 DECL_EXTERNAL (global_var) = 1; |
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194 TREE_STATIC (global_var) = 1; |
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195 TREE_USED (global_var) = 1; |
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196 DECL_CONTEXT (global_var) = NULL_TREE; |
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197 TREE_THIS_VOLATILE (global_var) = 0; |
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198 TREE_ADDRESSABLE (global_var) = 0; |
| 0 | 199 |
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200 create_var_ann (global_var); |
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201 add_referenced_var (global_var); |
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202 cfun->gimple_df->vop = global_var; |
| 0 | 203 } |
| 204 | |
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205 /* These are the sizes of the operand memory buffer in bytes which gets |
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206 allocated each time more operands space is required. The final value is |
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207 the amount that is allocated every time after that. |
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208 In 1k we can fit 25 use operands (or 63 def operands) on a host with |
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209 8 byte pointers, that would be 10 statements each with 1 def and 2 |
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210 uses. */ |
| 0 | 211 |
| 212 #define OP_SIZE_INIT 0 | |
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213 #define OP_SIZE_1 (1024 - sizeof (void *)) |
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214 #define OP_SIZE_2 (1024 * 4 - sizeof (void *)) |
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215 #define OP_SIZE_3 (1024 * 16 - sizeof (void *)) |
| 0 | 216 |
| 217 /* Initialize the operand cache routines. */ | |
| 218 | |
| 219 void | |
| 220 init_ssa_operands (void) | |
| 221 { | |
| 222 if (!n_initialized++) | |
| 223 { | |
| 224 build_defs = VEC_alloc (tree, heap, 5); | |
| 225 build_uses = VEC_alloc (tree, heap, 10); | |
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226 build_vuse = NULL_TREE; |
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227 build_vdef = NULL_TREE; |
| 0 | 228 bitmap_obstack_initialize (&operands_bitmap_obstack); |
| 229 } | |
| 230 | |
| 231 gcc_assert (gimple_ssa_operands (cfun)->operand_memory == NULL); | |
| 232 gimple_ssa_operands (cfun)->operand_memory_index | |
| 233 = gimple_ssa_operands (cfun)->ssa_operand_mem_size; | |
| 234 gimple_ssa_operands (cfun)->ops_active = true; | |
| 235 memset (&clobber_stats, 0, sizeof (clobber_stats)); | |
| 236 gimple_ssa_operands (cfun)->ssa_operand_mem_size = OP_SIZE_INIT; | |
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237 create_vop_var (); |
| 0 | 238 } |
| 239 | |
| 240 | |
| 241 /* Dispose of anything required by the operand routines. */ | |
| 242 | |
| 243 void | |
| 244 fini_ssa_operands (void) | |
| 245 { | |
| 246 struct ssa_operand_memory_d *ptr; | |
| 247 | |
| 248 if (!--n_initialized) | |
| 249 { | |
| 250 VEC_free (tree, heap, build_defs); | |
| 251 VEC_free (tree, heap, build_uses); | |
|
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252 build_vdef = NULL_TREE; |
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253 build_vuse = NULL_TREE; |
| 0 | 254 } |
| 255 | |
| 256 gimple_ssa_operands (cfun)->free_defs = NULL; | |
| 257 gimple_ssa_operands (cfun)->free_uses = NULL; | |
| 258 | |
| 259 while ((ptr = gimple_ssa_operands (cfun)->operand_memory) != NULL) | |
| 260 { | |
| 261 gimple_ssa_operands (cfun)->operand_memory | |
| 262 = gimple_ssa_operands (cfun)->operand_memory->next; | |
| 263 ggc_free (ptr); | |
| 264 } | |
| 265 | |
| 266 gimple_ssa_operands (cfun)->ops_active = false; | |
| 267 | |
| 268 if (!n_initialized) | |
| 269 bitmap_obstack_release (&operands_bitmap_obstack); | |
| 270 | |
|
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271 cfun->gimple_df->vop = NULL_TREE; |
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272 |
| 0 | 273 if (dump_file && (dump_flags & TDF_STATS)) |
| 274 { | |
| 275 fprintf (dump_file, "Original clobbered vars: %d\n", | |
| 276 clobber_stats.clobbered_vars); | |
| 277 fprintf (dump_file, "Static write clobbers avoided: %d\n", | |
| 278 clobber_stats.static_write_clobbers_avoided); | |
| 279 fprintf (dump_file, "Static read clobbers avoided: %d\n", | |
| 280 clobber_stats.static_read_clobbers_avoided); | |
| 281 fprintf (dump_file, "Unescapable clobbers avoided: %d\n", | |
| 282 clobber_stats.unescapable_clobbers_avoided); | |
| 283 fprintf (dump_file, "Original read-only clobbers: %d\n", | |
| 284 clobber_stats.readonly_clobbers); | |
| 285 fprintf (dump_file, "Static read-only clobbers avoided: %d\n", | |
| 286 clobber_stats.static_readonly_clobbers_avoided); | |
| 287 } | |
| 288 } | |
| 289 | |
| 290 | |
|
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291 /* Return memory for an operand of size SIZE. */ |
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292 |
| 0 | 293 static inline void * |
| 294 ssa_operand_alloc (unsigned size) | |
| 295 { | |
| 296 char *ptr; | |
| 297 | |
|
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298 gcc_assert (size == sizeof (struct use_optype_d) |
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299 || size == sizeof (struct def_optype_d)); |
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300 |
| 0 | 301 if (gimple_ssa_operands (cfun)->operand_memory_index + size |
| 302 >= gimple_ssa_operands (cfun)->ssa_operand_mem_size) | |
| 303 { | |
| 304 struct ssa_operand_memory_d *ptr; | |
| 305 | |
|
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306 switch (gimple_ssa_operands (cfun)->ssa_operand_mem_size) |
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307 { |
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308 case OP_SIZE_INIT: |
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309 gimple_ssa_operands (cfun)->ssa_operand_mem_size = OP_SIZE_1; |
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310 break; |
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311 case OP_SIZE_1: |
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312 gimple_ssa_operands (cfun)->ssa_operand_mem_size = OP_SIZE_2; |
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313 break; |
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314 case OP_SIZE_2: |
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315 case OP_SIZE_3: |
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316 gimple_ssa_operands (cfun)->ssa_operand_mem_size = OP_SIZE_3; |
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317 break; |
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318 default: |
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319 gcc_unreachable (); |
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320 } |
| 0 | 321 |
|
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322 ptr = (struct ssa_operand_memory_d *) |
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323 ggc_alloc (sizeof (void *) |
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324 + gimple_ssa_operands (cfun)->ssa_operand_mem_size); |
| 0 | 325 ptr->next = gimple_ssa_operands (cfun)->operand_memory; |
| 326 gimple_ssa_operands (cfun)->operand_memory = ptr; | |
| 327 gimple_ssa_operands (cfun)->operand_memory_index = 0; | |
| 328 } | |
|
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329 |
| 0 | 330 ptr = &(gimple_ssa_operands (cfun)->operand_memory |
| 331 ->mem[gimple_ssa_operands (cfun)->operand_memory_index]); | |
| 332 gimple_ssa_operands (cfun)->operand_memory_index += size; | |
| 333 return ptr; | |
| 334 } | |
| 335 | |
| 336 | |
| 337 /* Allocate a DEF operand. */ | |
| 338 | |
| 339 static inline struct def_optype_d * | |
| 340 alloc_def (void) | |
| 341 { | |
| 342 struct def_optype_d *ret; | |
| 343 if (gimple_ssa_operands (cfun)->free_defs) | |
| 344 { | |
| 345 ret = gimple_ssa_operands (cfun)->free_defs; | |
| 346 gimple_ssa_operands (cfun)->free_defs | |
| 347 = gimple_ssa_operands (cfun)->free_defs->next; | |
| 348 } | |
| 349 else | |
| 350 ret = (struct def_optype_d *) | |
| 351 ssa_operand_alloc (sizeof (struct def_optype_d)); | |
| 352 return ret; | |
| 353 } | |
| 354 | |
| 355 | |
| 356 /* Allocate a USE operand. */ | |
| 357 | |
| 358 static inline struct use_optype_d * | |
| 359 alloc_use (void) | |
| 360 { | |
| 361 struct use_optype_d *ret; | |
| 362 if (gimple_ssa_operands (cfun)->free_uses) | |
| 363 { | |
| 364 ret = gimple_ssa_operands (cfun)->free_uses; | |
| 365 gimple_ssa_operands (cfun)->free_uses | |
| 366 = gimple_ssa_operands (cfun)->free_uses->next; | |
| 367 } | |
| 368 else | |
| 369 ret = (struct use_optype_d *) | |
| 370 ssa_operand_alloc (sizeof (struct use_optype_d)); | |
| 371 return ret; | |
| 372 } | |
| 373 | |
| 374 | |
| 375 /* Adds OP to the list of defs after LAST. */ | |
| 376 | |
|
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377 static inline def_optype_p |
| 0 | 378 add_def_op (tree *op, def_optype_p last) |
| 379 { | |
| 380 def_optype_p new_def; | |
| 381 | |
| 382 new_def = alloc_def (); | |
| 383 DEF_OP_PTR (new_def) = op; | |
| 384 last->next = new_def; | |
| 385 new_def->next = NULL; | |
| 386 return new_def; | |
| 387 } | |
| 388 | |
| 389 | |
| 390 /* Adds OP to the list of uses of statement STMT after LAST. */ | |
| 391 | |
| 392 static inline use_optype_p | |
| 393 add_use_op (gimple stmt, tree *op, use_optype_p last) | |
| 394 { | |
| 395 use_optype_p new_use; | |
| 396 | |
| 397 new_use = alloc_use (); | |
| 398 USE_OP_PTR (new_use)->use = op; | |
| 399 link_imm_use_stmt (USE_OP_PTR (new_use), *op, stmt); | |
| 400 last->next = new_use; | |
| 401 new_use->next = NULL; | |
| 402 return new_use; | |
| 403 } | |
| 404 | |
| 405 | |
| 406 | |
| 407 /* Takes elements from build_defs and turns them into def operands of STMT. | |
| 408 TODO -- Make build_defs VEC of tree *. */ | |
| 409 | |
| 410 static inline void | |
| 411 finalize_ssa_defs (gimple stmt) | |
| 412 { | |
| 413 unsigned new_i; | |
| 414 struct def_optype_d new_list; | |
| 415 def_optype_p old_ops, last; | |
| 416 unsigned int num = VEC_length (tree, build_defs); | |
| 417 | |
| 418 /* There should only be a single real definition per assignment. */ | |
| 419 gcc_assert ((stmt && gimple_code (stmt) != GIMPLE_ASSIGN) || num <= 1); | |
| 420 | |
|
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421 /* Pre-pend the vdef we may have built. */ |
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422 if (build_vdef != NULL_TREE) |
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423 { |
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424 tree oldvdef = gimple_vdef (stmt); |
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425 if (oldvdef |
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426 && TREE_CODE (oldvdef) == SSA_NAME) |
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427 oldvdef = SSA_NAME_VAR (oldvdef); |
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428 if (oldvdef != build_vdef) |
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429 gimple_set_vdef (stmt, build_vdef); |
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430 VEC_safe_insert (tree, heap, build_defs, 0, (tree)gimple_vdef_ptr (stmt)); |
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431 ++num; |
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432 } |
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433 |
| 0 | 434 new_list.next = NULL; |
| 435 last = &new_list; | |
| 436 | |
| 437 old_ops = gimple_def_ops (stmt); | |
| 438 | |
| 439 new_i = 0; | |
| 440 | |
|
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441 /* Clear and unlink a no longer necessary VDEF. */ |
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442 if (build_vdef == NULL_TREE |
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443 && gimple_vdef (stmt) != NULL_TREE) |
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444 { |
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445 if (TREE_CODE (gimple_vdef (stmt)) == SSA_NAME) |
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446 { |
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447 unlink_stmt_vdef (stmt); |
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448 release_ssa_name (gimple_vdef (stmt)); |
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449 } |
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450 gimple_set_vdef (stmt, NULL_TREE); |
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451 } |
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452 |
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453 /* If we have a non-SSA_NAME VDEF, mark it for renaming. */ |
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454 if (gimple_vdef (stmt) |
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455 && TREE_CODE (gimple_vdef (stmt)) != SSA_NAME) |
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456 mark_sym_for_renaming (gimple_vdef (stmt)); |
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457 |
| 0 | 458 /* Check for the common case of 1 def that hasn't changed. */ |
| 459 if (old_ops && old_ops->next == NULL && num == 1 | |
| 460 && (tree *) VEC_index (tree, build_defs, 0) == DEF_OP_PTR (old_ops)) | |
| 461 return; | |
| 462 | |
| 463 /* If there is anything in the old list, free it. */ | |
| 464 if (old_ops) | |
| 465 { | |
| 466 old_ops->next = gimple_ssa_operands (cfun)->free_defs; | |
| 467 gimple_ssa_operands (cfun)->free_defs = old_ops; | |
| 468 } | |
| 469 | |
| 470 /* If there is anything remaining in the build_defs list, simply emit it. */ | |
| 471 for ( ; new_i < num; new_i++) | |
| 472 last = add_def_op ((tree *) VEC_index (tree, build_defs, new_i), last); | |
| 473 | |
| 474 /* Now set the stmt's operands. */ | |
| 475 gimple_set_def_ops (stmt, new_list.next); | |
| 476 } | |
| 477 | |
| 478 | |
| 479 /* Takes elements from build_uses and turns them into use operands of STMT. | |
| 480 TODO -- Make build_uses VEC of tree *. */ | |
| 481 | |
| 482 static inline void | |
| 483 finalize_ssa_uses (gimple stmt) | |
| 484 { | |
| 485 unsigned new_i; | |
| 486 struct use_optype_d new_list; | |
| 487 use_optype_p old_ops, ptr, last; | |
| 488 | |
|
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489 /* Pre-pend the VUSE we may have built. */ |
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490 if (build_vuse != NULL_TREE) |
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491 { |
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492 tree oldvuse = gimple_vuse (stmt); |
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493 if (oldvuse |
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494 && TREE_CODE (oldvuse) == SSA_NAME) |
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495 oldvuse = SSA_NAME_VAR (oldvuse); |
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496 if (oldvuse != (build_vuse != NULL_TREE |
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497 ? build_vuse : build_vdef)) |
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498 gimple_set_vuse (stmt, NULL_TREE); |
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499 VEC_safe_insert (tree, heap, build_uses, 0, (tree)gimple_vuse_ptr (stmt)); |
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500 } |
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501 |
| 0 | 502 new_list.next = NULL; |
| 503 last = &new_list; | |
| 504 | |
| 505 old_ops = gimple_use_ops (stmt); | |
| 506 | |
|
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507 /* Clear a no longer necessary VUSE. */ |
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508 if (build_vuse == NULL_TREE |
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509 && gimple_vuse (stmt) != NULL_TREE) |
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510 gimple_set_vuse (stmt, NULL_TREE); |
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511 |
| 0 | 512 /* If there is anything in the old list, free it. */ |
| 513 if (old_ops) | |
| 514 { | |
| 515 for (ptr = old_ops; ptr; ptr = ptr->next) | |
| 516 delink_imm_use (USE_OP_PTR (ptr)); | |
| 517 old_ops->next = gimple_ssa_operands (cfun)->free_uses; | |
| 518 gimple_ssa_operands (cfun)->free_uses = old_ops; | |
| 519 } | |
| 520 | |
|
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521 /* If we added a VUSE, make sure to set the operand if it is not already |
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522 present and mark it for renaming. */ |
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523 if (build_vuse != NULL_TREE |
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524 && gimple_vuse (stmt) == NULL_TREE) |
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525 { |
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526 gimple_set_vuse (stmt, gimple_vop (cfun)); |
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527 mark_sym_for_renaming (gimple_vop (cfun)); |
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528 } |
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529 |
| 0 | 530 /* Now create nodes for all the new nodes. */ |
| 531 for (new_i = 0; new_i < VEC_length (tree, build_uses); new_i++) | |
|
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532 last = add_use_op (stmt, |
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533 (tree *) VEC_index (tree, build_uses, new_i), |
| 0 | 534 last); |
| 535 | |
| 536 /* Now set the stmt's operands. */ | |
| 537 gimple_set_use_ops (stmt, new_list.next); | |
| 538 } | |
| 539 | |
| 540 | |
| 541 /* Clear the in_list bits and empty the build array for VDEFs and | |
| 542 VUSEs. */ | |
| 543 | |
| 544 static inline void | |
| 545 cleanup_build_arrays (void) | |
| 546 { | |
|
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547 build_vdef = NULL_TREE; |
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548 build_vuse = NULL_TREE; |
| 0 | 549 VEC_truncate (tree, build_defs, 0); |
| 550 VEC_truncate (tree, build_uses, 0); | |
| 551 } | |
| 552 | |
| 553 | |
| 554 /* Finalize all the build vectors, fill the new ones into INFO. */ | |
|
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555 |
| 0 | 556 static inline void |
| 557 finalize_ssa_stmt_operands (gimple stmt) | |
| 558 { | |
| 559 finalize_ssa_defs (stmt); | |
| 560 finalize_ssa_uses (stmt); | |
| 561 cleanup_build_arrays (); | |
| 562 } | |
| 563 | |
| 564 | |
| 565 /* Start the process of building up operands vectors in INFO. */ | |
| 566 | |
| 567 static inline void | |
| 568 start_ssa_stmt_operands (void) | |
| 569 { | |
| 570 gcc_assert (VEC_length (tree, build_defs) == 0); | |
| 571 gcc_assert (VEC_length (tree, build_uses) == 0); | |
|
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572 gcc_assert (build_vuse == NULL_TREE); |
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573 gcc_assert (build_vdef == NULL_TREE); |
| 0 | 574 } |
| 575 | |
| 576 | |
| 577 /* Add DEF_P to the list of pointers to operands. */ | |
| 578 | |
| 579 static inline void | |
| 580 append_def (tree *def_p) | |
| 581 { | |
| 582 VEC_safe_push (tree, heap, build_defs, (tree) def_p); | |
| 583 } | |
| 584 | |
| 585 | |
| 586 /* Add USE_P to the list of pointers to operands. */ | |
| 587 | |
| 588 static inline void | |
| 589 append_use (tree *use_p) | |
| 590 { | |
| 591 VEC_safe_push (tree, heap, build_uses, (tree) use_p); | |
| 592 } | |
| 593 | |
| 594 | |
| 595 /* Add VAR to the set of variables that require a VDEF operator. */ | |
| 596 | |
| 597 static inline void | |
| 598 append_vdef (tree var) | |
| 599 { | |
|
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600 if (!optimize) |
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601 return; |
| 0 | 602 |
|
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603 gcc_assert ((build_vdef == NULL_TREE |
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604 || build_vdef == var) |
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605 && (build_vuse == NULL_TREE |
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606 || build_vuse == var)); |
| 0 | 607 |
|
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608 build_vdef = var; |
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609 build_vuse = var; |
| 0 | 610 } |
| 611 | |
| 612 | |
| 613 /* Add VAR to the set of variables that require a VUSE operator. */ | |
| 614 | |
| 615 static inline void | |
| 616 append_vuse (tree var) | |
| 617 { | |
|
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618 if (!optimize) |
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619 return; |
| 0 | 620 |
|
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621 gcc_assert (build_vuse == NULL_TREE |
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622 || build_vuse == var); |
| 0 | 623 |
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624 build_vuse = var; |
| 0 | 625 } |
| 626 | |
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627 /* Add virtual operands for STMT. FLAGS is as in get_expr_operands. */ |
| 0 | 628 |
| 629 static void | |
|
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630 add_virtual_operand (gimple stmt ATTRIBUTE_UNUSED, int flags) |
| 0 | 631 { |
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632 /* Add virtual operands to the stmt, unless the caller has specifically |
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633 requested not to do that (used when adding operands inside an |
| 0 | 634 ADDR_EXPR expression). */ |
| 635 if (flags & opf_no_vops) | |
| 636 return; | |
| 637 | |
|
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638 gcc_assert (!is_gimple_debug (stmt)); |
| 0 | 639 |
|
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640 if (flags & opf_def) |
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641 append_vdef (gimple_vop (cfun)); |
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642 else |
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643 append_vuse (gimple_vop (cfun)); |
| 0 | 644 } |
| 645 | |
| 646 | |
| 647 /* Add *VAR_P to the appropriate operand array for statement STMT. | |
| 648 FLAGS is as in get_expr_operands. If *VAR_P is a GIMPLE register, | |
| 649 it will be added to the statement's real operands, otherwise it is | |
| 650 added to virtual operands. */ | |
| 651 | |
| 652 static void | |
| 653 add_stmt_operand (tree *var_p, gimple stmt, int flags) | |
| 654 { | |
| 655 tree var, sym; | |
| 656 | |
| 657 gcc_assert (SSA_VAR_P (*var_p)); | |
| 658 | |
| 659 var = *var_p; | |
| 660 sym = (TREE_CODE (var) == SSA_NAME ? SSA_NAME_VAR (var) : var); | |
| 661 | |
| 662 /* Mark statements with volatile operands. */ | |
| 663 if (TREE_THIS_VOLATILE (sym)) | |
| 664 gimple_set_has_volatile_ops (stmt, true); | |
| 665 | |
| 666 if (is_gimple_reg (sym)) | |
| 667 { | |
| 668 /* The variable is a GIMPLE register. Add it to real operands. */ | |
| 669 if (flags & opf_def) | |
| 670 append_def (var_p); | |
| 671 else | |
| 672 append_use (var_p); | |
| 673 } | |
| 674 else | |
|
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675 add_virtual_operand (stmt, flags); |
| 0 | 676 } |
| 677 | |
|
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678 /* Mark the base address of REF as having its address taken. |
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679 REF may be a single variable whose address has been taken or any |
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680 other valid GIMPLE memory reference (structure reference, array, |
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681 etc). */ |
| 0 | 682 |
| 683 static void | |
|
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684 mark_address_taken (tree ref) |
| 0 | 685 { |
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686 tree var; |
| 0 | 687 |
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688 /* Note that it is *NOT OKAY* to use the target of a COMPONENT_REF |
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689 as the only thing we take the address of. If VAR is a structure, |
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690 taking the address of a field means that the whole structure may |
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691 be referenced using pointer arithmetic. See PR 21407 and the |
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692 ensuing mailing list discussion. */ |
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693 var = get_base_address (ref); |
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694 if (var && DECL_P (var)) |
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695 TREE_ADDRESSABLE (var) = 1; |
| 0 | 696 } |
| 697 | |
| 698 | |
| 699 /* A subroutine of get_expr_operands to handle INDIRECT_REF, | |
|
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700 ALIGN_INDIRECT_REF and MISALIGNED_INDIRECT_REF. |
| 0 | 701 |
| 702 STMT is the statement being processed, EXPR is the INDIRECT_REF | |
| 703 that got us here. | |
|
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704 |
| 0 | 705 FLAGS is as in get_expr_operands. |
| 706 | |
| 707 RECURSE_ON_BASE should be set to true if we want to continue | |
| 708 calling get_expr_operands on the base pointer, and false if | |
| 709 something else will do it for us. */ | |
| 710 | |
| 711 static void | |
|
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712 get_indirect_ref_operands (gimple stmt, tree expr, int flags, |
| 0 | 713 bool recurse_on_base) |
| 714 { | |
| 715 tree *pptr = &TREE_OPERAND (expr, 0); | |
| 716 | |
| 717 if (TREE_THIS_VOLATILE (expr)) | |
| 718 gimple_set_has_volatile_ops (stmt, true); | |
| 719 | |
|
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720 /* Add the VOP. */ |
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721 add_virtual_operand (stmt, flags); |
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722 |
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723 /* If requested, add a USE operand for the base pointer. */ |
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724 if (recurse_on_base) |
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725 get_expr_operands (stmt, pptr, |
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726 opf_use | (flags & opf_no_vops)); |
| 0 | 727 } |
| 728 | |
| 729 | |
| 730 /* A subroutine of get_expr_operands to handle TARGET_MEM_REF. */ | |
| 731 | |
| 732 static void | |
| 733 get_tmr_operands (gimple stmt, tree expr, int flags) | |
| 734 { | |
| 735 /* First record the real operands. */ | |
|
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736 get_expr_operands (stmt, &TMR_BASE (expr), opf_use | (flags & opf_no_vops)); |
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737 get_expr_operands (stmt, &TMR_INDEX (expr), opf_use | (flags & opf_no_vops)); |
| 0 | 738 |
| 739 if (TMR_SYMBOL (expr)) | |
|
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740 mark_address_taken (TMR_SYMBOL (expr)); |
| 0 | 741 |
|
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742 add_virtual_operand (stmt, flags); |
| 0 | 743 } |
| 744 | |
| 745 | |
| 746 /* If STMT is a call that may clobber globals and other symbols that | |
| 747 escape, add them to the VDEF/VUSE lists for it. */ | |
| 748 | |
| 749 static void | |
|
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750 maybe_add_call_vops (gimple stmt) |
| 0 | 751 { |
| 752 int call_flags = gimple_call_flags (stmt); | |
| 753 | |
| 754 /* If aliases have been computed already, add VDEF or VUSE | |
| 755 operands for all the symbols that have been found to be | |
| 756 call-clobbered. */ | |
|
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757 if (!(call_flags & ECF_NOVOPS)) |
| 0 | 758 { |
|
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759 /* A 'pure' or a 'const' function never call-clobbers anything. |
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760 A 'noreturn' function might, but since we don't return anyway |
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761 there is no point in recording that. */ |
| 0 | 762 if (!(call_flags & (ECF_PURE | ECF_CONST | ECF_NORETURN))) |
|
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763 add_virtual_operand (stmt, opf_def); |
| 0 | 764 else if (!(call_flags & ECF_CONST)) |
|
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765 add_virtual_operand (stmt, opf_use); |
| 0 | 766 } |
| 767 } | |
| 768 | |
| 769 | |
| 770 /* Scan operands in the ASM_EXPR stmt referred to in INFO. */ | |
| 771 | |
| 772 static void | |
| 773 get_asm_expr_operands (gimple stmt) | |
| 774 { | |
| 775 size_t i, noutputs; | |
| 776 const char **oconstraints; | |
| 777 const char *constraint; | |
| 778 bool allows_mem, allows_reg, is_inout; | |
| 779 | |
| 780 noutputs = gimple_asm_noutputs (stmt); | |
| 781 oconstraints = (const char **) alloca ((noutputs) * sizeof (const char *)); | |
| 782 | |
| 783 /* Gather all output operands. */ | |
| 784 for (i = 0; i < gimple_asm_noutputs (stmt); i++) | |
| 785 { | |
| 786 tree link = gimple_asm_output_op (stmt, i); | |
| 787 constraint = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link))); | |
| 788 oconstraints[i] = constraint; | |
| 789 parse_output_constraint (&constraint, i, 0, 0, &allows_mem, | |
| 790 &allows_reg, &is_inout); | |
| 791 | |
| 792 /* This should have been split in gimplify_asm_expr. */ | |
| 793 gcc_assert (!allows_reg || !is_inout); | |
| 794 | |
| 795 /* Memory operands are addressable. Note that STMT needs the | |
| 796 address of this operand. */ | |
| 797 if (!allows_reg && allows_mem) | |
| 798 { | |
| 799 tree t = get_base_address (TREE_VALUE (link)); | |
| 800 if (t && DECL_P (t)) | |
|
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801 mark_address_taken (t); |
| 0 | 802 } |
| 803 | |
| 804 get_expr_operands (stmt, &TREE_VALUE (link), opf_def); | |
| 805 } | |
| 806 | |
| 807 /* Gather all input operands. */ | |
| 808 for (i = 0; i < gimple_asm_ninputs (stmt); i++) | |
| 809 { | |
| 810 tree link = gimple_asm_input_op (stmt, i); | |
| 811 constraint = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link))); | |
| 812 parse_input_constraint (&constraint, 0, 0, noutputs, 0, oconstraints, | |
| 813 &allows_mem, &allows_reg); | |
| 814 | |
| 815 /* Memory operands are addressable. Note that STMT needs the | |
| 816 address of this operand. */ | |
| 817 if (!allows_reg && allows_mem) | |
| 818 { | |
| 819 tree t = get_base_address (TREE_VALUE (link)); | |
| 820 if (t && DECL_P (t)) | |
|
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821 mark_address_taken (t); |
| 0 | 822 } |
| 823 | |
| 824 get_expr_operands (stmt, &TREE_VALUE (link), 0); | |
| 825 } | |
| 826 | |
| 827 /* Clobber all memory and addressable symbols for asm ("" : : : "memory"); */ | |
| 828 for (i = 0; i < gimple_asm_nclobbers (stmt); i++) | |
| 829 { | |
| 830 tree link = gimple_asm_clobber_op (stmt, i); | |
| 831 if (strcmp (TREE_STRING_POINTER (TREE_VALUE (link)), "memory") == 0) | |
| 832 { | |
|
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833 add_virtual_operand (stmt, opf_def); |
| 0 | 834 break; |
| 835 } | |
| 836 } | |
| 837 } | |
| 838 | |
| 839 | |
| 840 /* Recursively scan the expression pointed to by EXPR_P in statement | |
| 841 STMT. FLAGS is one of the OPF_* constants modifying how to | |
| 842 interpret the operands found. */ | |
| 843 | |
| 844 static void | |
| 845 get_expr_operands (gimple stmt, tree *expr_p, int flags) | |
| 846 { | |
| 847 enum tree_code code; | |
| 848 enum tree_code_class codeclass; | |
| 849 tree expr = *expr_p; | |
|
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850 int uflags = opf_use; |
| 0 | 851 |
| 852 if (expr == NULL) | |
| 853 return; | |
| 854 | |
|
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855 if (is_gimple_debug (stmt)) |
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856 uflags |= (flags & opf_no_vops); |
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857 |
| 0 | 858 code = TREE_CODE (expr); |
| 859 codeclass = TREE_CODE_CLASS (code); | |
| 860 | |
| 861 switch (code) | |
| 862 { | |
| 863 case ADDR_EXPR: | |
| 864 /* Taking the address of a variable does not represent a | |
| 865 reference to it, but the fact that the statement takes its | |
| 866 address will be of interest to some passes (e.g. alias | |
| 867 resolution). */ | |
|
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868 if (!is_gimple_debug (stmt)) |
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869 mark_address_taken (TREE_OPERAND (expr, 0)); |
| 0 | 870 |
| 871 /* If the address is invariant, there may be no interesting | |
| 872 variable references inside. */ | |
| 873 if (is_gimple_min_invariant (expr)) | |
| 874 return; | |
| 875 | |
| 876 /* Otherwise, there may be variables referenced inside but there | |
| 877 should be no VUSEs created, since the referenced objects are | |
| 878 not really accessed. The only operands that we should find | |
| 879 here are ARRAY_REF indices which will always be real operands | |
| 880 (GIMPLE does not allow non-registers as array indices). */ | |
| 881 flags |= opf_no_vops; | |
| 882 get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags); | |
| 883 return; | |
| 884 | |
| 885 case SSA_NAME: | |
| 886 add_stmt_operand (expr_p, stmt, flags); | |
| 887 return; | |
| 888 | |
| 889 case VAR_DECL: | |
| 890 case PARM_DECL: | |
| 891 case RESULT_DECL: | |
| 892 add_stmt_operand (expr_p, stmt, flags); | |
| 893 return; | |
| 894 | |
|
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895 case DEBUG_EXPR_DECL: |
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896 gcc_assert (gimple_debug_bind_p (stmt)); |
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897 return; |
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898 |
| 0 | 899 case MISALIGNED_INDIRECT_REF: |
| 900 get_expr_operands (stmt, &TREE_OPERAND (expr, 1), flags); | |
| 901 /* fall through */ | |
| 902 | |
| 903 case ALIGN_INDIRECT_REF: | |
| 904 case INDIRECT_REF: | |
|
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905 get_indirect_ref_operands (stmt, expr, flags, true); |
| 0 | 906 return; |
| 907 | |
| 908 case TARGET_MEM_REF: | |
| 909 get_tmr_operands (stmt, expr, flags); | |
| 910 return; | |
| 911 | |
| 912 case ARRAY_REF: | |
| 913 case ARRAY_RANGE_REF: | |
| 914 case COMPONENT_REF: | |
| 915 case REALPART_EXPR: | |
| 916 case IMAGPART_EXPR: | |
| 917 { | |
| 918 if (TREE_THIS_VOLATILE (expr)) | |
| 919 gimple_set_has_volatile_ops (stmt, true); | |
| 920 | |
|
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921 get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags); |
| 0 | 922 |
| 923 if (code == COMPONENT_REF) | |
| 924 { | |
| 925 if (TREE_THIS_VOLATILE (TREE_OPERAND (expr, 1))) | |
| 926 gimple_set_has_volatile_ops (stmt, true); | |
|
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927 get_expr_operands (stmt, &TREE_OPERAND (expr, 2), uflags); |
| 0 | 928 } |
| 929 else if (code == ARRAY_REF || code == ARRAY_RANGE_REF) | |
| 930 { | |
|
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931 get_expr_operands (stmt, &TREE_OPERAND (expr, 1), uflags); |
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932 get_expr_operands (stmt, &TREE_OPERAND (expr, 2), uflags); |
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933 get_expr_operands (stmt, &TREE_OPERAND (expr, 3), uflags); |
| 0 | 934 } |
| 935 | |
| 936 return; | |
| 937 } | |
| 938 | |
| 939 case WITH_SIZE_EXPR: | |
| 940 /* WITH_SIZE_EXPR is a pass-through reference to its first argument, | |
| 941 and an rvalue reference to its second argument. */ | |
|
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942 get_expr_operands (stmt, &TREE_OPERAND (expr, 1), uflags); |
| 0 | 943 get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags); |
| 944 return; | |
| 945 | |
| 946 case COND_EXPR: | |
| 947 case VEC_COND_EXPR: | |
|
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948 get_expr_operands (stmt, &TREE_OPERAND (expr, 0), uflags); |
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949 get_expr_operands (stmt, &TREE_OPERAND (expr, 1), uflags); |
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950 get_expr_operands (stmt, &TREE_OPERAND (expr, 2), uflags); |
| 0 | 951 return; |
| 952 | |
| 953 case CONSTRUCTOR: | |
| 954 { | |
| 955 /* General aggregate CONSTRUCTORs have been decomposed, but they | |
| 956 are still in use as the COMPLEX_EXPR equivalent for vectors. */ | |
| 957 constructor_elt *ce; | |
| 958 unsigned HOST_WIDE_INT idx; | |
| 959 | |
| 960 for (idx = 0; | |
| 961 VEC_iterate (constructor_elt, CONSTRUCTOR_ELTS (expr), idx, ce); | |
| 962 idx++) | |
|
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963 get_expr_operands (stmt, &ce->value, uflags); |
| 0 | 964 |
| 965 return; | |
| 966 } | |
| 967 | |
| 968 case BIT_FIELD_REF: | |
| 969 if (TREE_THIS_VOLATILE (expr)) | |
| 970 gimple_set_has_volatile_ops (stmt, true); | |
| 971 /* FALLTHRU */ | |
| 972 | |
| 973 case TRUTH_NOT_EXPR: | |
| 974 case VIEW_CONVERT_EXPR: | |
| 975 do_unary: | |
| 976 get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags); | |
| 977 return; | |
| 978 | |
| 979 case TRUTH_AND_EXPR: | |
| 980 case TRUTH_OR_EXPR: | |
| 981 case TRUTH_XOR_EXPR: | |
| 982 case COMPOUND_EXPR: | |
| 983 case OBJ_TYPE_REF: | |
| 984 case ASSERT_EXPR: | |
| 985 do_binary: | |
| 986 { | |
| 987 get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags); | |
| 988 get_expr_operands (stmt, &TREE_OPERAND (expr, 1), flags); | |
| 989 return; | |
| 990 } | |
| 991 | |
| 992 case DOT_PROD_EXPR: | |
| 993 case REALIGN_LOAD_EXPR: | |
| 994 { | |
| 995 get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags); | |
| 996 get_expr_operands (stmt, &TREE_OPERAND (expr, 1), flags); | |
| 997 get_expr_operands (stmt, &TREE_OPERAND (expr, 2), flags); | |
| 998 return; | |
| 999 } | |
| 1000 | |
| 1001 case FUNCTION_DECL: | |
| 1002 case LABEL_DECL: | |
| 1003 case CONST_DECL: | |
| 1004 case CASE_LABEL_EXPR: | |
| 1005 /* Expressions that make no memory references. */ | |
| 1006 return; | |
| 1007 | |
| 1008 default: | |
| 1009 if (codeclass == tcc_unary) | |
| 1010 goto do_unary; | |
| 1011 if (codeclass == tcc_binary || codeclass == tcc_comparison) | |
| 1012 goto do_binary; | |
| 1013 if (codeclass == tcc_constant || codeclass == tcc_type) | |
| 1014 return; | |
| 1015 } | |
| 1016 | |
| 1017 /* If we get here, something has gone wrong. */ | |
| 1018 #ifdef ENABLE_CHECKING | |
| 1019 fprintf (stderr, "unhandled expression in get_expr_operands():\n"); | |
| 1020 debug_tree (expr); | |
| 1021 fputs ("\n", stderr); | |
| 1022 #endif | |
| 1023 gcc_unreachable (); | |
| 1024 } | |
| 1025 | |
| 1026 | |
| 1027 /* Parse STMT looking for operands. When finished, the various | |
| 1028 build_* operand vectors will have potential operands in them. */ | |
| 1029 | |
| 1030 static void | |
| 1031 parse_ssa_operands (gimple stmt) | |
| 1032 { | |
| 1033 enum gimple_code code = gimple_code (stmt); | |
| 1034 | |
| 1035 if (code == GIMPLE_ASM) | |
| 1036 get_asm_expr_operands (stmt); | |
|
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1037 else if (is_gimple_debug (stmt)) |
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1038 { |
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1039 if (gimple_debug_bind_p (stmt) |
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1040 && gimple_debug_bind_has_value_p (stmt)) |
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1041 get_expr_operands (stmt, gimple_debug_bind_get_value_ptr (stmt), |
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1042 opf_use | opf_no_vops); |
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1043 } |
| 0 | 1044 else |
| 1045 { | |
| 1046 size_t i, start = 0; | |
| 1047 | |
| 1048 if (code == GIMPLE_ASSIGN || code == GIMPLE_CALL) | |
| 1049 { | |
| 1050 get_expr_operands (stmt, gimple_op_ptr (stmt, 0), opf_def); | |
| 1051 start = 1; | |
| 1052 } | |
| 1053 | |
| 1054 for (i = start; i < gimple_num_ops (stmt); i++) | |
| 1055 get_expr_operands (stmt, gimple_op_ptr (stmt, i), opf_use); | |
| 1056 | |
| 1057 /* Add call-clobbered operands, if needed. */ | |
| 1058 if (code == GIMPLE_CALL) | |
|
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1059 maybe_add_call_vops (stmt); |
| 0 | 1060 } |
| 1061 } | |
| 1062 | |
| 1063 | |
| 1064 /* Create an operands cache for STMT. */ | |
| 1065 | |
| 1066 static void | |
| 1067 build_ssa_operands (gimple stmt) | |
| 1068 { | |
|
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|
1069 /* Initially assume that the statement has no volatile operands. */ |
| 0 | 1070 gimple_set_has_volatile_ops (stmt, false); |
| 1071 | |
| 1072 start_ssa_stmt_operands (); | |
| 1073 parse_ssa_operands (stmt); | |
| 1074 finalize_ssa_stmt_operands (stmt); | |
| 1075 } | |
| 1076 | |
| 1077 | |
| 1078 /* Releases the operands of STMT back to their freelists, and clears | |
| 1079 the stmt operand lists. */ | |
| 1080 | |
| 1081 void | |
| 1082 free_stmt_operands (gimple stmt) | |
| 1083 { | |
| 1084 def_optype_p defs = gimple_def_ops (stmt), last_def; | |
| 1085 use_optype_p uses = gimple_use_ops (stmt), last_use; | |
| 1086 | |
| 1087 if (defs) | |
| 1088 { | |
| 1089 for (last_def = defs; last_def->next; last_def = last_def->next) | |
| 1090 continue; | |
| 1091 last_def->next = gimple_ssa_operands (cfun)->free_defs; | |
| 1092 gimple_ssa_operands (cfun)->free_defs = defs; | |
| 1093 gimple_set_def_ops (stmt, NULL); | |
| 1094 } | |
| 1095 | |
| 1096 if (uses) | |
| 1097 { | |
| 1098 for (last_use = uses; last_use->next; last_use = last_use->next) | |
| 1099 delink_imm_use (USE_OP_PTR (last_use)); | |
| 1100 delink_imm_use (USE_OP_PTR (last_use)); | |
| 1101 last_use->next = gimple_ssa_operands (cfun)->free_uses; | |
| 1102 gimple_ssa_operands (cfun)->free_uses = uses; | |
| 1103 gimple_set_use_ops (stmt, NULL); | |
| 1104 } | |
| 1105 | |
| 1106 if (gimple_has_mem_ops (stmt)) | |
| 1107 { | |
|
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1108 gimple_set_vuse (stmt, NULL_TREE); |
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1109 gimple_set_vdef (stmt, NULL_TREE); |
| 0 | 1110 } |
| 1111 } | |
| 1112 | |
| 1113 | |
| 1114 /* Get the operands of statement STMT. */ | |
| 1115 | |
| 1116 void | |
| 1117 update_stmt_operands (gimple stmt) | |
| 1118 { | |
| 1119 /* If update_stmt_operands is called before SSA is initialized, do | |
| 1120 nothing. */ | |
| 1121 if (!ssa_operands_active ()) | |
| 1122 return; | |
| 1123 | |
| 1124 timevar_push (TV_TREE_OPS); | |
| 1125 | |
| 1126 gcc_assert (gimple_modified_p (stmt)); | |
| 1127 build_ssa_operands (stmt); | |
| 1128 gimple_set_modified (stmt, false); | |
| 1129 | |
| 1130 timevar_pop (TV_TREE_OPS); | |
| 1131 } | |
| 1132 | |
| 1133 | |
| 1134 /* Swap operands EXP0 and EXP1 in statement STMT. No attempt is done | |
| 1135 to test the validity of the swap operation. */ | |
| 1136 | |
| 1137 void | |
| 1138 swap_tree_operands (gimple stmt, tree *exp0, tree *exp1) | |
| 1139 { | |
| 1140 tree op0, op1; | |
| 1141 op0 = *exp0; | |
| 1142 op1 = *exp1; | |
| 1143 | |
| 1144 /* If the operand cache is active, attempt to preserve the relative | |
| 1145 positions of these two operands in their respective immediate use | |
| 1146 lists. */ | |
| 1147 if (ssa_operands_active () && op0 != op1) | |
| 1148 { | |
| 1149 use_optype_p use0, use1, ptr; | |
| 1150 use0 = use1 = NULL; | |
| 1151 | |
| 1152 /* Find the 2 operands in the cache, if they are there. */ | |
| 1153 for (ptr = gimple_use_ops (stmt); ptr; ptr = ptr->next) | |
| 1154 if (USE_OP_PTR (ptr)->use == exp0) | |
| 1155 { | |
| 1156 use0 = ptr; | |
| 1157 break; | |
| 1158 } | |
| 1159 | |
| 1160 for (ptr = gimple_use_ops (stmt); ptr; ptr = ptr->next) | |
| 1161 if (USE_OP_PTR (ptr)->use == exp1) | |
| 1162 { | |
| 1163 use1 = ptr; | |
| 1164 break; | |
| 1165 } | |
| 1166 | |
| 1167 /* If both uses don't have operand entries, there isn't much we can do | |
| 1168 at this point. Presumably we don't need to worry about it. */ | |
| 1169 if (use0 && use1) | |
| 1170 { | |
| 1171 tree *tmp = USE_OP_PTR (use1)->use; | |
| 1172 USE_OP_PTR (use1)->use = USE_OP_PTR (use0)->use; | |
| 1173 USE_OP_PTR (use0)->use = tmp; | |
| 1174 } | |
| 1175 } | |
| 1176 | |
| 1177 /* Now swap the data. */ | |
| 1178 *exp0 = op1; | |
| 1179 *exp1 = op0; | |
| 1180 } | |
| 1181 | |
| 1182 | |
| 1183 /* Scan the immediate_use list for VAR making sure its linked properly. | |
| 1184 Return TRUE if there is a problem and emit an error message to F. */ | |
| 1185 | |
| 1186 bool | |
| 1187 verify_imm_links (FILE *f, tree var) | |
| 1188 { | |
| 1189 use_operand_p ptr, prev, list; | |
| 1190 int count; | |
| 1191 | |
| 1192 gcc_assert (TREE_CODE (var) == SSA_NAME); | |
| 1193 | |
| 1194 list = &(SSA_NAME_IMM_USE_NODE (var)); | |
| 1195 gcc_assert (list->use == NULL); | |
| 1196 | |
| 1197 if (list->prev == NULL) | |
| 1198 { | |
| 1199 gcc_assert (list->next == NULL); | |
| 1200 return false; | |
| 1201 } | |
| 1202 | |
| 1203 prev = list; | |
| 1204 count = 0; | |
| 1205 for (ptr = list->next; ptr != list; ) | |
| 1206 { | |
| 1207 if (prev != ptr->prev) | |
| 1208 goto error; | |
|
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1209 |
| 0 | 1210 if (ptr->use == NULL) |
| 1211 goto error; /* 2 roots, or SAFE guard node. */ | |
| 1212 else if (*(ptr->use) != var) | |
| 1213 goto error; | |
| 1214 | |
| 1215 prev = ptr; | |
| 1216 ptr = ptr->next; | |
| 1217 | |
| 1218 /* Avoid infinite loops. 50,000,000 uses probably indicates a | |
| 1219 problem. */ | |
| 1220 if (count++ > 50000000) | |
| 1221 goto error; | |
| 1222 } | |
| 1223 | |
| 1224 /* Verify list in the other direction. */ | |
| 1225 prev = list; | |
| 1226 for (ptr = list->prev; ptr != list; ) | |
| 1227 { | |
| 1228 if (prev != ptr->next) | |
| 1229 goto error; | |
| 1230 prev = ptr; | |
| 1231 ptr = ptr->prev; | |
| 1232 if (count-- < 0) | |
| 1233 goto error; | |
| 1234 } | |
| 1235 | |
| 1236 if (count != 0) | |
| 1237 goto error; | |
| 1238 | |
| 1239 return false; | |
| 1240 | |
| 1241 error: | |
| 1242 if (ptr->loc.stmt && gimple_modified_p (ptr->loc.stmt)) | |
| 1243 { | |
| 1244 fprintf (f, " STMT MODIFIED. - <%p> ", (void *)ptr->loc.stmt); | |
| 1245 print_gimple_stmt (f, ptr->loc.stmt, 0, TDF_SLIM); | |
| 1246 } | |
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1247 fprintf (f, " IMM ERROR : (use_p : tree - %p:%p)", (void *)ptr, |
| 0 | 1248 (void *)ptr->use); |
| 1249 print_generic_expr (f, USE_FROM_PTR (ptr), TDF_SLIM); | |
| 1250 fprintf(f, "\n"); | |
| 1251 return true; | |
| 1252 } | |
| 1253 | |
| 1254 | |
| 1255 /* Dump all the immediate uses to FILE. */ | |
| 1256 | |
| 1257 void | |
| 1258 dump_immediate_uses_for (FILE *file, tree var) | |
| 1259 { | |
| 1260 imm_use_iterator iter; | |
| 1261 use_operand_p use_p; | |
| 1262 | |
| 1263 gcc_assert (var && TREE_CODE (var) == SSA_NAME); | |
| 1264 | |
| 1265 print_generic_expr (file, var, TDF_SLIM); | |
| 1266 fprintf (file, " : -->"); | |
| 1267 if (has_zero_uses (var)) | |
| 1268 fprintf (file, " no uses.\n"); | |
| 1269 else | |
| 1270 if (has_single_use (var)) | |
| 1271 fprintf (file, " single use.\n"); | |
| 1272 else | |
| 1273 fprintf (file, "%d uses.\n", num_imm_uses (var)); | |
| 1274 | |
| 1275 FOR_EACH_IMM_USE_FAST (use_p, iter, var) | |
| 1276 { | |
| 1277 if (use_p->loc.stmt == NULL && use_p->use == NULL) | |
| 1278 fprintf (file, "***end of stmt iterator marker***\n"); | |
| 1279 else | |
| 1280 if (!is_gimple_reg (USE_FROM_PTR (use_p))) | |
| 1281 print_gimple_stmt (file, USE_STMT (use_p), 0, TDF_VOPS|TDF_MEMSYMS); | |
| 1282 else | |
| 1283 print_gimple_stmt (file, USE_STMT (use_p), 0, TDF_SLIM); | |
| 1284 } | |
| 1285 fprintf(file, "\n"); | |
| 1286 } | |
| 1287 | |
| 1288 | |
| 1289 /* Dump all the immediate uses to FILE. */ | |
| 1290 | |
| 1291 void | |
| 1292 dump_immediate_uses (FILE *file) | |
| 1293 { | |
| 1294 tree var; | |
| 1295 unsigned int x; | |
| 1296 | |
| 1297 fprintf (file, "Immediate_uses: \n\n"); | |
| 1298 for (x = 1; x < num_ssa_names; x++) | |
| 1299 { | |
| 1300 var = ssa_name(x); | |
| 1301 if (!var) | |
| 1302 continue; | |
| 1303 dump_immediate_uses_for (file, var); | |
| 1304 } | |
| 1305 } | |
| 1306 | |
| 1307 | |
| 1308 /* Dump def-use edges on stderr. */ | |
| 1309 | |
| 1310 void | |
| 1311 debug_immediate_uses (void) | |
| 1312 { | |
| 1313 dump_immediate_uses (stderr); | |
| 1314 } | |
| 1315 | |
| 1316 | |
| 1317 /* Dump def-use edges on stderr. */ | |
| 1318 | |
| 1319 void | |
| 1320 debug_immediate_uses_for (tree var) | |
| 1321 { | |
| 1322 dump_immediate_uses_for (stderr, var); | |
| 1323 } | |
| 1324 | |
| 1325 | |
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1326 /* Unlink STMTs virtual definition from the IL by propagating its use. */ |
| 0 | 1327 |
| 1328 void | |
|
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1329 unlink_stmt_vdef (gimple stmt) |
| 0 | 1330 { |
|
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1331 use_operand_p use_p; |
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1332 imm_use_iterator iter; |
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1333 gimple use_stmt; |
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1334 tree vdef = gimple_vdef (stmt); |
| 0 | 1335 |
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1336 if (!vdef |
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1337 || TREE_CODE (vdef) != SSA_NAME) |
| 0 | 1338 return; |
| 1339 | |
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1340 FOR_EACH_IMM_USE_STMT (use_stmt, iter, gimple_vdef (stmt)) |
| 0 | 1341 { |
|
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1342 FOR_EACH_IMM_USE_ON_STMT (use_p, iter) |
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1343 SET_USE (use_p, gimple_vuse (stmt)); |
| 0 | 1344 } |
| 1345 | |
|
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1346 if (SSA_NAME_OCCURS_IN_ABNORMAL_PHI (gimple_vdef (stmt))) |
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1347 SSA_NAME_OCCURS_IN_ABNORMAL_PHI (gimple_vuse (stmt)) = 1; |
| 0 | 1348 } |
| 1349 |