Mercurial > hg > CbC > CbC_gcc
annotate gcc/tree-ssa-operands.c @ 60:bd49c42ec43e
remove unnecessary files
author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
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date | Mon, 15 Feb 2010 17:39:45 +0900 |
parents | 326d9e06c2e3 |
children | 1b10fe6932e1 |
rev | line source |
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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" | |
1 | 37 #ifndef noCbC |
38 #include "cbc-tree.h" | |
39 #endif | |
0 | 40 |
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41 /* This file contains the code required to manage the operands cache of the |
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42 SSA optimizer. For every stmt, we maintain an operand cache in the stmt |
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43 annotation. This cache contains operands that will be of interest to |
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44 optimizers and other passes wishing to manipulate the IL. |
0 | 45 |
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46 The operand type are broken up into REAL and VIRTUAL operands. The real |
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47 operands are represented as pointers into the stmt's operand tree. Thus |
0 | 48 any manipulation of the real operands will be reflected in the actual tree. |
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49 Virtual operands are represented solely in the cache, although the base |
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50 variable for the SSA_NAME may, or may not occur in the stmt's tree. |
0 | 51 Manipulation of the virtual operands will not be reflected in the stmt tree. |
52 | |
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53 The routines in this file are concerned with creating this operand cache |
0 | 54 from a stmt tree. |
55 | |
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56 The operand tree is the parsed by the various get_* routines which look |
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57 through the stmt tree for the occurrence of operands which may be of |
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58 interest, and calls are made to the append_* routines whenever one is |
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59 found. There are 4 of these routines, each representing one of the |
0 | 60 4 types of operands. Defs, Uses, Virtual Uses, and Virtual May Defs. |
61 | |
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62 The append_* routines check for duplication, and simply keep a list of |
0 | 63 unique objects for each operand type in the build_* extendable vectors. |
64 | |
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65 Once the stmt tree is completely parsed, the finalize_ssa_operands() |
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66 routine is called, which proceeds to perform the finalization routine |
0 | 67 on each of the 4 operand vectors which have been built up. |
68 | |
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69 If the stmt had a previous operand cache, the finalization routines |
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70 attempt to match up the new operands with the old ones. If it's a perfect |
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71 match, the old vector is simply reused. If it isn't a perfect match, then |
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72 a new vector is created and the new operands are placed there. For |
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73 virtual operands, if the previous cache had SSA_NAME version of a |
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74 variable, and that same variable occurs in the same operands cache, then |
0 | 75 the new cache vector will also get the same SSA_NAME. |
76 | |
77 i.e., if a stmt had a VUSE of 'a_5', and 'a' occurs in the new | |
78 operand vector for VUSE, then the new vector will also be modified | |
79 such that it contains 'a_5' rather than 'a'. */ | |
80 | |
81 /* Structure storing statistics on how many call clobbers we have, and | |
82 how many where avoided. */ | |
83 | |
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84 static struct |
0 | 85 { |
86 /* Number of call-clobbered ops we attempt to add to calls in | |
87 add_call_clobbered_mem_symbols. */ | |
88 unsigned int clobbered_vars; | |
89 | |
90 /* Number of write-clobbers (VDEFs) avoided by using | |
91 not_written information. */ | |
92 unsigned int static_write_clobbers_avoided; | |
93 | |
94 /* Number of reads (VUSEs) avoided by using not_read information. */ | |
95 unsigned int static_read_clobbers_avoided; | |
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96 |
0 | 97 /* Number of write-clobbers avoided because the variable can't escape to |
98 this call. */ | |
99 unsigned int unescapable_clobbers_avoided; | |
100 | |
101 /* Number of read-only uses we attempt to add to calls in | |
102 add_call_read_mem_symbols. */ | |
103 unsigned int readonly_clobbers; | |
104 | |
105 /* Number of read-only uses we avoid using not_read information. */ | |
106 unsigned int static_readonly_clobbers_avoided; | |
107 } clobber_stats; | |
108 | |
109 | |
110 /* Flags to describe operand properties in helpers. */ | |
111 | |
112 /* By default, operands are loaded. */ | |
113 #define opf_use 0 | |
114 | |
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115 /* Operand is the target of an assignment expression or a |
0 | 116 call-clobbered variable. */ |
117 #define opf_def (1 << 0) | |
118 | |
119 /* No virtual operands should be created in the expression. This is used | |
120 when traversing ADDR_EXPR nodes which have different semantics than | |
121 other expressions. Inside an ADDR_EXPR node, the only operands that we | |
122 need to consider are indices into arrays. For instance, &a.b[i] should | |
123 generate a USE of 'i' but it should not generate a VUSE for 'a' nor a | |
124 VUSE for 'b'. */ | |
125 #define opf_no_vops (1 << 1) | |
126 | |
127 /* Operand is an implicit reference. This is used to distinguish | |
128 explicit assignments in the form of MODIFY_EXPR from | |
129 clobbering sites like function calls or ASM_EXPRs. */ | |
130 #define opf_implicit (1 << 2) | |
131 | |
132 /* Array for building all the def operands. */ | |
133 static VEC(tree,heap) *build_defs; | |
134 | |
135 /* Array for building all the use operands. */ | |
136 static VEC(tree,heap) *build_uses; | |
137 | |
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138 /* The built VDEF operand. */ |
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139 static tree build_vdef; |
0 | 140 |
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141 /* The built VUSE operand. */ |
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142 static tree build_vuse; |
0 | 143 |
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144 /* Bitmap obstack for our datastructures that needs to survive across |
0 | 145 compilations of multiple functions. */ |
146 static bitmap_obstack operands_bitmap_obstack; | |
147 | |
148 static void get_expr_operands (gimple, tree *, int); | |
149 | |
150 /* Number of functions with initialized ssa_operands. */ | |
151 static int n_initialized = 0; | |
152 | |
153 /* Return the DECL_UID of the base variable of T. */ | |
154 | |
155 static inline unsigned | |
156 get_name_decl (const_tree t) | |
157 { | |
158 if (TREE_CODE (t) != SSA_NAME) | |
159 return DECL_UID (t); | |
160 else | |
161 return DECL_UID (SSA_NAME_VAR (t)); | |
162 } | |
163 | |
164 | |
165 /* Return true if the SSA operands cache is active. */ | |
166 | |
167 bool | |
168 ssa_operands_active (void) | |
169 { | |
170 /* This function may be invoked from contexts where CFUN is NULL | |
171 (IPA passes), return false for now. FIXME: operands may be | |
172 active in each individual function, maybe this function should | |
173 take CFUN as a parameter. */ | |
174 if (cfun == NULL) | |
175 return false; | |
176 | |
177 return cfun->gimple_df && gimple_ssa_operands (cfun)->ops_active; | |
178 } | |
179 | |
180 | |
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181 /* Create the VOP variable, an artificial global variable to act as a |
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182 representative of all of the virtual operands FUD chain. */ |
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183 |
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184 static void |
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185 create_vop_var (void) |
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186 { |
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187 tree global_var; |
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188 |
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189 gcc_assert (cfun->gimple_df->vop == NULL_TREE); |
0 | 190 |
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191 global_var = build_decl (BUILTINS_LOCATION, VAR_DECL, |
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192 get_identifier (".MEM"), |
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193 void_type_node); |
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194 DECL_ARTIFICIAL (global_var) = 1; |
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195 TREE_READONLY (global_var) = 0; |
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196 DECL_EXTERNAL (global_var) = 1; |
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197 TREE_STATIC (global_var) = 1; |
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198 TREE_USED (global_var) = 1; |
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199 DECL_CONTEXT (global_var) = NULL_TREE; |
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200 TREE_THIS_VOLATILE (global_var) = 0; |
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201 TREE_ADDRESSABLE (global_var) = 0; |
0 | 202 |
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203 create_var_ann (global_var); |
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204 add_referenced_var (global_var); |
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205 cfun->gimple_df->vop = global_var; |
0 | 206 } |
207 | |
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208 /* These are the sizes of the operand memory buffer in bytes which gets |
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209 allocated each time more operands space is required. The final value is |
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210 the amount that is allocated every time after that. |
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211 In 1k we can fit 25 use operands (or 63 def operands) on a host with |
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212 8 byte pointers, that would be 10 statements each with 1 def and 2 |
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213 uses. */ |
0 | 214 |
215 #define OP_SIZE_INIT 0 | |
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216 #define OP_SIZE_1 (1024 - sizeof (void *)) |
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217 #define OP_SIZE_2 (1024 * 4 - sizeof (void *)) |
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218 #define OP_SIZE_3 (1024 * 16 - sizeof (void *)) |
0 | 219 |
220 /* Initialize the operand cache routines. */ | |
221 | |
222 void | |
223 init_ssa_operands (void) | |
224 { | |
225 if (!n_initialized++) | |
226 { | |
227 build_defs = VEC_alloc (tree, heap, 5); | |
228 build_uses = VEC_alloc (tree, heap, 10); | |
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229 build_vuse = NULL_TREE; |
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230 build_vdef = NULL_TREE; |
0 | 231 bitmap_obstack_initialize (&operands_bitmap_obstack); |
232 } | |
233 | |
234 gcc_assert (gimple_ssa_operands (cfun)->operand_memory == NULL); | |
235 gimple_ssa_operands (cfun)->operand_memory_index | |
236 = gimple_ssa_operands (cfun)->ssa_operand_mem_size; | |
237 gimple_ssa_operands (cfun)->ops_active = true; | |
238 memset (&clobber_stats, 0, sizeof (clobber_stats)); | |
239 gimple_ssa_operands (cfun)->ssa_operand_mem_size = OP_SIZE_INIT; | |
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240 create_vop_var (); |
0 | 241 } |
242 | |
243 | |
244 /* Dispose of anything required by the operand routines. */ | |
245 | |
246 void | |
247 fini_ssa_operands (void) | |
248 { | |
249 struct ssa_operand_memory_d *ptr; | |
250 | |
251 if (!--n_initialized) | |
252 { | |
253 VEC_free (tree, heap, build_defs); | |
254 VEC_free (tree, heap, build_uses); | |
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255 build_vdef = NULL_TREE; |
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256 build_vuse = NULL_TREE; |
0 | 257 } |
258 | |
259 gimple_ssa_operands (cfun)->free_defs = NULL; | |
260 gimple_ssa_operands (cfun)->free_uses = NULL; | |
261 | |
262 while ((ptr = gimple_ssa_operands (cfun)->operand_memory) != NULL) | |
263 { | |
264 gimple_ssa_operands (cfun)->operand_memory | |
265 = gimple_ssa_operands (cfun)->operand_memory->next; | |
266 ggc_free (ptr); | |
267 } | |
268 | |
269 gimple_ssa_operands (cfun)->ops_active = false; | |
270 | |
271 if (!n_initialized) | |
272 bitmap_obstack_release (&operands_bitmap_obstack); | |
273 | |
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274 cfun->gimple_df->vop = NULL_TREE; |
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275 |
0 | 276 if (dump_file && (dump_flags & TDF_STATS)) |
277 { | |
278 fprintf (dump_file, "Original clobbered vars: %d\n", | |
279 clobber_stats.clobbered_vars); | |
280 fprintf (dump_file, "Static write clobbers avoided: %d\n", | |
281 clobber_stats.static_write_clobbers_avoided); | |
282 fprintf (dump_file, "Static read clobbers avoided: %d\n", | |
283 clobber_stats.static_read_clobbers_avoided); | |
284 fprintf (dump_file, "Unescapable clobbers avoided: %d\n", | |
285 clobber_stats.unescapable_clobbers_avoided); | |
286 fprintf (dump_file, "Original read-only clobbers: %d\n", | |
287 clobber_stats.readonly_clobbers); | |
288 fprintf (dump_file, "Static read-only clobbers avoided: %d\n", | |
289 clobber_stats.static_readonly_clobbers_avoided); | |
290 } | |
291 } | |
292 | |
293 | |
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294 /* Return memory for an operand of size SIZE. */ |
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295 |
0 | 296 static inline void * |
297 ssa_operand_alloc (unsigned size) | |
298 { | |
299 char *ptr; | |
300 | |
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301 gcc_assert (size == sizeof (struct use_optype_d) |
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302 || size == sizeof (struct def_optype_d)); |
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303 |
0 | 304 if (gimple_ssa_operands (cfun)->operand_memory_index + size |
305 >= gimple_ssa_operands (cfun)->ssa_operand_mem_size) | |
306 { | |
307 struct ssa_operand_memory_d *ptr; | |
308 | |
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309 switch (gimple_ssa_operands (cfun)->ssa_operand_mem_size) |
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310 { |
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311 case OP_SIZE_INIT: |
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312 gimple_ssa_operands (cfun)->ssa_operand_mem_size = OP_SIZE_1; |
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313 break; |
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314 case OP_SIZE_1: |
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315 gimple_ssa_operands (cfun)->ssa_operand_mem_size = OP_SIZE_2; |
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316 break; |
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317 case OP_SIZE_2: |
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318 case OP_SIZE_3: |
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319 gimple_ssa_operands (cfun)->ssa_operand_mem_size = OP_SIZE_3; |
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320 break; |
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321 default: |
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322 gcc_unreachable (); |
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323 } |
0 | 324 |
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325 ptr = (struct ssa_operand_memory_d *) |
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326 ggc_alloc (sizeof (void *) |
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327 + gimple_ssa_operands (cfun)->ssa_operand_mem_size); |
0 | 328 ptr->next = gimple_ssa_operands (cfun)->operand_memory; |
329 gimple_ssa_operands (cfun)->operand_memory = ptr; | |
330 gimple_ssa_operands (cfun)->operand_memory_index = 0; | |
331 } | |
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332 |
0 | 333 ptr = &(gimple_ssa_operands (cfun)->operand_memory |
334 ->mem[gimple_ssa_operands (cfun)->operand_memory_index]); | |
335 gimple_ssa_operands (cfun)->operand_memory_index += size; | |
336 return ptr; | |
337 } | |
338 | |
339 | |
340 /* Allocate a DEF operand. */ | |
341 | |
342 static inline struct def_optype_d * | |
343 alloc_def (void) | |
344 { | |
345 struct def_optype_d *ret; | |
346 if (gimple_ssa_operands (cfun)->free_defs) | |
347 { | |
348 ret = gimple_ssa_operands (cfun)->free_defs; | |
349 gimple_ssa_operands (cfun)->free_defs | |
350 = gimple_ssa_operands (cfun)->free_defs->next; | |
351 } | |
352 else | |
353 ret = (struct def_optype_d *) | |
354 ssa_operand_alloc (sizeof (struct def_optype_d)); | |
355 return ret; | |
356 } | |
357 | |
358 | |
359 /* Allocate a USE operand. */ | |
360 | |
361 static inline struct use_optype_d * | |
362 alloc_use (void) | |
363 { | |
364 struct use_optype_d *ret; | |
365 if (gimple_ssa_operands (cfun)->free_uses) | |
366 { | |
367 ret = gimple_ssa_operands (cfun)->free_uses; | |
368 gimple_ssa_operands (cfun)->free_uses | |
369 = gimple_ssa_operands (cfun)->free_uses->next; | |
370 } | |
371 else | |
372 ret = (struct use_optype_d *) | |
373 ssa_operand_alloc (sizeof (struct use_optype_d)); | |
374 return ret; | |
375 } | |
376 | |
377 | |
378 /* Adds OP to the list of defs after LAST. */ | |
379 | |
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380 static inline def_optype_p |
0 | 381 add_def_op (tree *op, def_optype_p last) |
382 { | |
383 def_optype_p new_def; | |
384 | |
385 new_def = alloc_def (); | |
386 DEF_OP_PTR (new_def) = op; | |
387 last->next = new_def; | |
388 new_def->next = NULL; | |
389 return new_def; | |
390 } | |
391 | |
392 | |
393 /* Adds OP to the list of uses of statement STMT after LAST. */ | |
394 | |
395 static inline use_optype_p | |
396 add_use_op (gimple stmt, tree *op, use_optype_p last) | |
397 { | |
398 use_optype_p new_use; | |
399 | |
400 new_use = alloc_use (); | |
401 USE_OP_PTR (new_use)->use = op; | |
402 link_imm_use_stmt (USE_OP_PTR (new_use), *op, stmt); | |
403 last->next = new_use; | |
404 new_use->next = NULL; | |
405 return new_use; | |
406 } | |
407 | |
408 | |
409 | |
410 /* Takes elements from build_defs and turns them into def operands of STMT. | |
411 TODO -- Make build_defs VEC of tree *. */ | |
412 | |
413 static inline void | |
414 finalize_ssa_defs (gimple stmt) | |
415 { | |
416 unsigned new_i; | |
417 struct def_optype_d new_list; | |
418 def_optype_p old_ops, last; | |
419 unsigned int num = VEC_length (tree, build_defs); | |
420 | |
421 /* There should only be a single real definition per assignment. */ | |
422 gcc_assert ((stmt && gimple_code (stmt) != GIMPLE_ASSIGN) || num <= 1); | |
423 | |
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424 /* Pre-pend the vdef we may have built. */ |
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425 if (build_vdef != NULL_TREE) |
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426 { |
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427 tree oldvdef = gimple_vdef (stmt); |
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428 if (oldvdef |
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429 && TREE_CODE (oldvdef) == SSA_NAME) |
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430 oldvdef = SSA_NAME_VAR (oldvdef); |
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431 if (oldvdef != build_vdef) |
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432 gimple_set_vdef (stmt, build_vdef); |
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433 VEC_safe_insert (tree, heap, build_defs, 0, (tree)gimple_vdef_ptr (stmt)); |
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434 ++num; |
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435 } |
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436 |
0 | 437 new_list.next = NULL; |
438 last = &new_list; | |
439 | |
440 old_ops = gimple_def_ops (stmt); | |
441 | |
442 new_i = 0; | |
443 | |
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444 /* Clear and unlink a no longer necessary VDEF. */ |
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445 if (build_vdef == NULL_TREE |
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446 && gimple_vdef (stmt) != NULL_TREE) |
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447 { |
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448 if (TREE_CODE (gimple_vdef (stmt)) == SSA_NAME) |
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449 { |
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450 unlink_stmt_vdef (stmt); |
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451 release_ssa_name (gimple_vdef (stmt)); |
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452 } |
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453 gimple_set_vdef (stmt, NULL_TREE); |
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454 } |
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455 |
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456 /* If we have a non-SSA_NAME VDEF, mark it for renaming. */ |
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457 if (gimple_vdef (stmt) |
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458 && TREE_CODE (gimple_vdef (stmt)) != SSA_NAME) |
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459 mark_sym_for_renaming (gimple_vdef (stmt)); |
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460 |
0 | 461 /* Check for the common case of 1 def that hasn't changed. */ |
462 if (old_ops && old_ops->next == NULL && num == 1 | |
463 && (tree *) VEC_index (tree, build_defs, 0) == DEF_OP_PTR (old_ops)) | |
464 return; | |
465 | |
466 /* If there is anything in the old list, free it. */ | |
467 if (old_ops) | |
468 { | |
469 old_ops->next = gimple_ssa_operands (cfun)->free_defs; | |
470 gimple_ssa_operands (cfun)->free_defs = old_ops; | |
471 } | |
472 | |
473 /* If there is anything remaining in the build_defs list, simply emit it. */ | |
474 for ( ; new_i < num; new_i++) | |
475 last = add_def_op ((tree *) VEC_index (tree, build_defs, new_i), last); | |
476 | |
477 /* Now set the stmt's operands. */ | |
478 gimple_set_def_ops (stmt, new_list.next); | |
479 } | |
480 | |
481 | |
482 /* Takes elements from build_uses and turns them into use operands of STMT. | |
483 TODO -- Make build_uses VEC of tree *. */ | |
484 | |
485 static inline void | |
486 finalize_ssa_uses (gimple stmt) | |
487 { | |
488 unsigned new_i; | |
489 struct use_optype_d new_list; | |
490 use_optype_p old_ops, ptr, last; | |
491 | |
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492 /* Pre-pend the VUSE we may have built. */ |
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493 if (build_vuse != NULL_TREE) |
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494 { |
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495 tree oldvuse = gimple_vuse (stmt); |
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496 if (oldvuse |
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497 && TREE_CODE (oldvuse) == SSA_NAME) |
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498 oldvuse = SSA_NAME_VAR (oldvuse); |
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499 if (oldvuse != (build_vuse != NULL_TREE |
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500 ? build_vuse : build_vdef)) |
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501 gimple_set_vuse (stmt, NULL_TREE); |
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502 VEC_safe_insert (tree, heap, build_uses, 0, (tree)gimple_vuse_ptr (stmt)); |
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503 } |
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504 |
0 | 505 new_list.next = NULL; |
506 last = &new_list; | |
507 | |
508 old_ops = gimple_use_ops (stmt); | |
509 | |
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510 /* Clear a no longer necessary VUSE. */ |
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511 if (build_vuse == NULL_TREE |
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512 && gimple_vuse (stmt) != NULL_TREE) |
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513 gimple_set_vuse (stmt, NULL_TREE); |
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514 |
0 | 515 /* If there is anything in the old list, free it. */ |
516 if (old_ops) | |
517 { | |
518 for (ptr = old_ops; ptr; ptr = ptr->next) | |
519 delink_imm_use (USE_OP_PTR (ptr)); | |
520 old_ops->next = gimple_ssa_operands (cfun)->free_uses; | |
521 gimple_ssa_operands (cfun)->free_uses = old_ops; | |
522 } | |
523 | |
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524 /* If we added a VUSE, make sure to set the operand if it is not already |
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525 present and mark it for renaming. */ |
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526 if (build_vuse != NULL_TREE |
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527 && gimple_vuse (stmt) == NULL_TREE) |
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528 { |
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529 gimple_set_vuse (stmt, gimple_vop (cfun)); |
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530 mark_sym_for_renaming (gimple_vop (cfun)); |
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531 } |
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532 |
0 | 533 /* Now create nodes for all the new nodes. */ |
534 for (new_i = 0; new_i < VEC_length (tree, build_uses); new_i++) | |
55
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535 last = add_use_op (stmt, |
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536 (tree *) VEC_index (tree, build_uses, new_i), |
0 | 537 last); |
538 | |
539 /* Now set the stmt's operands. */ | |
540 gimple_set_use_ops (stmt, new_list.next); | |
541 } | |
542 | |
543 | |
544 /* Clear the in_list bits and empty the build array for VDEFs and | |
545 VUSEs. */ | |
546 | |
547 static inline void | |
548 cleanup_build_arrays (void) | |
549 { | |
55
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550 build_vdef = NULL_TREE; |
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551 build_vuse = NULL_TREE; |
0 | 552 VEC_truncate (tree, build_defs, 0); |
553 VEC_truncate (tree, build_uses, 0); | |
554 } | |
555 | |
556 | |
557 /* Finalize all the build vectors, fill the new ones into INFO. */ | |
55
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558 |
0 | 559 static inline void |
560 finalize_ssa_stmt_operands (gimple stmt) | |
561 { | |
562 finalize_ssa_defs (stmt); | |
563 finalize_ssa_uses (stmt); | |
564 cleanup_build_arrays (); | |
565 } | |
566 | |
567 | |
568 /* Start the process of building up operands vectors in INFO. */ | |
569 | |
570 static inline void | |
571 start_ssa_stmt_operands (void) | |
572 { | |
573 gcc_assert (VEC_length (tree, build_defs) == 0); | |
574 gcc_assert (VEC_length (tree, build_uses) == 0); | |
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575 gcc_assert (build_vuse == NULL_TREE); |
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576 gcc_assert (build_vdef == NULL_TREE); |
0 | 577 } |
578 | |
579 | |
580 /* Add DEF_P to the list of pointers to operands. */ | |
581 | |
582 static inline void | |
583 append_def (tree *def_p) | |
584 { | |
585 VEC_safe_push (tree, heap, build_defs, (tree) def_p); | |
586 } | |
587 | |
588 | |
589 /* Add USE_P to the list of pointers to operands. */ | |
590 | |
591 static inline void | |
592 append_use (tree *use_p) | |
593 { | |
594 VEC_safe_push (tree, heap, build_uses, (tree) use_p); | |
595 } | |
596 | |
597 | |
598 /* Add VAR to the set of variables that require a VDEF operator. */ | |
599 | |
600 static inline void | |
601 append_vdef (tree var) | |
602 { | |
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603 if (!optimize) |
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604 return; |
0 | 605 |
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606 gcc_assert ((build_vdef == NULL_TREE |
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607 || build_vdef == var) |
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608 && (build_vuse == NULL_TREE |
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609 || build_vuse == var)); |
0 | 610 |
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611 build_vdef = var; |
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612 build_vuse = var; |
0 | 613 } |
614 | |
615 | |
616 /* Add VAR to the set of variables that require a VUSE operator. */ | |
617 | |
618 static inline void | |
619 append_vuse (tree var) | |
620 { | |
55
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621 if (!optimize) |
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622 return; |
0 | 623 |
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624 gcc_assert (build_vuse == NULL_TREE |
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625 || build_vuse == var); |
0 | 626 |
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627 build_vuse = var; |
0 | 628 } |
629 | |
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630 /* Add virtual operands for STMT. FLAGS is as in get_expr_operands. */ |
0 | 631 |
632 static void | |
55
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633 add_virtual_operand (gimple stmt ATTRIBUTE_UNUSED, int flags) |
0 | 634 { |
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635 /* Add virtual operands to the stmt, unless the caller has specifically |
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636 requested not to do that (used when adding operands inside an |
0 | 637 ADDR_EXPR expression). */ |
638 if (flags & opf_no_vops) | |
639 return; | |
640 | |
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641 gcc_assert (!is_gimple_debug (stmt)); |
0 | 642 |
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643 if (flags & opf_def) |
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644 append_vdef (gimple_vop (cfun)); |
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645 else |
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646 append_vuse (gimple_vop (cfun)); |
0 | 647 } |
648 | |
649 | |
650 /* Add *VAR_P to the appropriate operand array for statement STMT. | |
651 FLAGS is as in get_expr_operands. If *VAR_P is a GIMPLE register, | |
652 it will be added to the statement's real operands, otherwise it is | |
653 added to virtual operands. */ | |
654 | |
655 static void | |
656 add_stmt_operand (tree *var_p, gimple stmt, int flags) | |
657 { | |
658 tree var, sym; | |
659 | |
660 gcc_assert (SSA_VAR_P (*var_p)); | |
661 | |
662 var = *var_p; | |
663 sym = (TREE_CODE (var) == SSA_NAME ? SSA_NAME_VAR (var) : var); | |
664 | |
665 /* Mark statements with volatile operands. */ | |
666 if (TREE_THIS_VOLATILE (sym)) | |
667 gimple_set_has_volatile_ops (stmt, true); | |
668 | |
669 if (is_gimple_reg (sym)) | |
670 { | |
671 /* The variable is a GIMPLE register. Add it to real operands. */ | |
672 if (flags & opf_def) | |
673 append_def (var_p); | |
674 else | |
675 append_use (var_p); | |
676 } | |
677 else | |
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678 add_virtual_operand (stmt, flags); |
0 | 679 } |
680 | |
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681 /* Mark the base address of REF as having its address taken. |
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682 REF may be a single variable whose address has been taken or any |
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683 other valid GIMPLE memory reference (structure reference, array, |
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684 etc). */ |
0 | 685 |
686 static void | |
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687 mark_address_taken (tree ref) |
0 | 688 { |
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689 tree var; |
0 | 690 |
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691 /* Note that it is *NOT OKAY* to use the target of a COMPONENT_REF |
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692 as the only thing we take the address of. If VAR is a structure, |
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693 taking the address of a field means that the whole structure may |
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694 be referenced using pointer arithmetic. See PR 21407 and the |
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695 ensuing mailing list discussion. */ |
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696 var = get_base_address (ref); |
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697 if (var && DECL_P (var)) |
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698 TREE_ADDRESSABLE (var) = 1; |
0 | 699 } |
700 | |
701 | |
702 /* A subroutine of get_expr_operands to handle INDIRECT_REF, | |
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703 ALIGN_INDIRECT_REF and MISALIGNED_INDIRECT_REF. |
0 | 704 |
705 STMT is the statement being processed, EXPR is the INDIRECT_REF | |
706 that got us here. | |
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707 |
0 | 708 FLAGS is as in get_expr_operands. |
709 | |
710 RECURSE_ON_BASE should be set to true if we want to continue | |
711 calling get_expr_operands on the base pointer, and false if | |
712 something else will do it for us. */ | |
713 | |
714 static void | |
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715 get_indirect_ref_operands (gimple stmt, tree expr, int flags, |
0 | 716 bool recurse_on_base) |
717 { | |
718 tree *pptr = &TREE_OPERAND (expr, 0); | |
719 | |
720 if (TREE_THIS_VOLATILE (expr)) | |
721 gimple_set_has_volatile_ops (stmt, true); | |
722 | |
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723 /* Add the VOP. */ |
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724 add_virtual_operand (stmt, flags); |
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725 |
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726 /* If requested, add a USE operand for the base pointer. */ |
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727 if (recurse_on_base) |
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728 get_expr_operands (stmt, pptr, |
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729 opf_use | (flags & opf_no_vops)); |
0 | 730 } |
731 | |
732 | |
733 /* A subroutine of get_expr_operands to handle TARGET_MEM_REF. */ | |
734 | |
735 static void | |
736 get_tmr_operands (gimple stmt, tree expr, int flags) | |
737 { | |
738 /* First record the real operands. */ | |
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739 get_expr_operands (stmt, &TMR_BASE (expr), opf_use | (flags & opf_no_vops)); |
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740 get_expr_operands (stmt, &TMR_INDEX (expr), opf_use | (flags & opf_no_vops)); |
0 | 741 |
742 if (TMR_SYMBOL (expr)) | |
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743 mark_address_taken (TMR_SYMBOL (expr)); |
0 | 744 |
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745 add_virtual_operand (stmt, flags); |
0 | 746 } |
747 | |
748 | |
749 /* If STMT is a call that may clobber globals and other symbols that | |
750 escape, add them to the VDEF/VUSE lists for it. */ | |
751 | |
752 static void | |
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753 maybe_add_call_vops (gimple stmt) |
0 | 754 { |
755 int call_flags = gimple_call_flags (stmt); | |
756 | |
757 /* If aliases have been computed already, add VDEF or VUSE | |
758 operands for all the symbols that have been found to be | |
759 call-clobbered. */ | |
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760 if (!(call_flags & ECF_NOVOPS)) |
0 | 761 { |
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762 /* A 'pure' or a 'const' function never call-clobbers anything. |
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763 A 'noreturn' function might, but since we don't return anyway |
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764 there is no point in recording that. */ |
0 | 765 if (!(call_flags & (ECF_PURE | ECF_CONST | ECF_NORETURN))) |
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766 add_virtual_operand (stmt, opf_def); |
0 | 767 else if (!(call_flags & ECF_CONST)) |
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768 add_virtual_operand (stmt, opf_use); |
0 | 769 } |
770 } | |
771 | |
772 | |
773 /* Scan operands in the ASM_EXPR stmt referred to in INFO. */ | |
774 | |
775 static void | |
776 get_asm_expr_operands (gimple stmt) | |
777 { | |
778 size_t i, noutputs; | |
779 const char **oconstraints; | |
780 const char *constraint; | |
781 bool allows_mem, allows_reg, is_inout; | |
782 | |
783 noutputs = gimple_asm_noutputs (stmt); | |
784 oconstraints = (const char **) alloca ((noutputs) * sizeof (const char *)); | |
785 | |
786 /* Gather all output operands. */ | |
787 for (i = 0; i < gimple_asm_noutputs (stmt); i++) | |
788 { | |
789 tree link = gimple_asm_output_op (stmt, i); | |
790 constraint = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link))); | |
791 oconstraints[i] = constraint; | |
792 parse_output_constraint (&constraint, i, 0, 0, &allows_mem, | |
793 &allows_reg, &is_inout); | |
794 | |
795 /* This should have been split in gimplify_asm_expr. */ | |
796 gcc_assert (!allows_reg || !is_inout); | |
797 | |
798 /* Memory operands are addressable. Note that STMT needs the | |
799 address of this operand. */ | |
800 if (!allows_reg && allows_mem) | |
801 { | |
802 tree t = get_base_address (TREE_VALUE (link)); | |
803 if (t && DECL_P (t)) | |
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804 mark_address_taken (t); |
0 | 805 } |
806 | |
807 get_expr_operands (stmt, &TREE_VALUE (link), opf_def); | |
808 } | |
809 | |
810 /* Gather all input operands. */ | |
811 for (i = 0; i < gimple_asm_ninputs (stmt); i++) | |
812 { | |
813 tree link = gimple_asm_input_op (stmt, i); | |
814 constraint = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link))); | |
815 parse_input_constraint (&constraint, 0, 0, noutputs, 0, oconstraints, | |
816 &allows_mem, &allows_reg); | |
817 | |
818 /* Memory operands are addressable. Note that STMT needs the | |
819 address of this operand. */ | |
820 if (!allows_reg && allows_mem) | |
821 { | |
822 tree t = get_base_address (TREE_VALUE (link)); | |
823 if (t && DECL_P (t)) | |
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824 mark_address_taken (t); |
0 | 825 } |
826 | |
827 get_expr_operands (stmt, &TREE_VALUE (link), 0); | |
828 } | |
829 | |
830 /* Clobber all memory and addressable symbols for asm ("" : : : "memory"); */ | |
831 for (i = 0; i < gimple_asm_nclobbers (stmt); i++) | |
832 { | |
833 tree link = gimple_asm_clobber_op (stmt, i); | |
834 if (strcmp (TREE_STRING_POINTER (TREE_VALUE (link)), "memory") == 0) | |
835 { | |
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836 add_virtual_operand (stmt, opf_def); |
0 | 837 break; |
838 } | |
839 } | |
840 } | |
841 | |
842 | |
843 /* Recursively scan the expression pointed to by EXPR_P in statement | |
844 STMT. FLAGS is one of the OPF_* constants modifying how to | |
845 interpret the operands found. */ | |
846 | |
847 static void | |
848 get_expr_operands (gimple stmt, tree *expr_p, int flags) | |
849 { | |
850 enum tree_code code; | |
851 enum tree_code_class codeclass; | |
852 tree expr = *expr_p; | |
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853 int uflags = opf_use; |
0 | 854 |
855 if (expr == NULL) | |
856 return; | |
857 | |
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858 if (is_gimple_debug (stmt)) |
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859 uflags |= (flags & opf_no_vops); |
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860 |
0 | 861 code = TREE_CODE (expr); |
862 codeclass = TREE_CODE_CLASS (code); | |
863 | |
864 switch (code) | |
865 { | |
866 case ADDR_EXPR: | |
867 /* Taking the address of a variable does not represent a | |
868 reference to it, but the fact that the statement takes its | |
869 address will be of interest to some passes (e.g. alias | |
870 resolution). */ | |
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871 if (!is_gimple_debug (stmt)) |
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872 mark_address_taken (TREE_OPERAND (expr, 0)); |
0 | 873 |
874 /* If the address is invariant, there may be no interesting | |
875 variable references inside. */ | |
876 if (is_gimple_min_invariant (expr)) | |
877 return; | |
878 | |
879 /* Otherwise, there may be variables referenced inside but there | |
880 should be no VUSEs created, since the referenced objects are | |
881 not really accessed. The only operands that we should find | |
882 here are ARRAY_REF indices which will always be real operands | |
883 (GIMPLE does not allow non-registers as array indices). */ | |
884 flags |= opf_no_vops; | |
885 get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags); | |
886 return; | |
887 | |
888 case SSA_NAME: | |
889 add_stmt_operand (expr_p, stmt, flags); | |
890 return; | |
891 | |
892 case VAR_DECL: | |
893 case PARM_DECL: | |
894 case RESULT_DECL: | |
895 add_stmt_operand (expr_p, stmt, flags); | |
896 return; | |
897 | |
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898 case DEBUG_EXPR_DECL: |
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899 gcc_assert (gimple_debug_bind_p (stmt)); |
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900 return; |
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901 |
0 | 902 case MISALIGNED_INDIRECT_REF: |
903 get_expr_operands (stmt, &TREE_OPERAND (expr, 1), flags); | |
904 /* fall through */ | |
905 | |
906 case ALIGN_INDIRECT_REF: | |
907 case INDIRECT_REF: | |
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908 get_indirect_ref_operands (stmt, expr, flags, true); |
0 | 909 return; |
910 | |
911 case TARGET_MEM_REF: | |
912 get_tmr_operands (stmt, expr, flags); | |
913 return; | |
914 | |
915 case ARRAY_REF: | |
916 case ARRAY_RANGE_REF: | |
917 case COMPONENT_REF: | |
918 case REALPART_EXPR: | |
919 case IMAGPART_EXPR: | |
920 { | |
921 if (TREE_THIS_VOLATILE (expr)) | |
922 gimple_set_has_volatile_ops (stmt, true); | |
923 | |
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924 get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags); |
0 | 925 |
926 if (code == COMPONENT_REF) | |
927 { | |
928 if (TREE_THIS_VOLATILE (TREE_OPERAND (expr, 1))) | |
929 gimple_set_has_volatile_ops (stmt, true); | |
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930 get_expr_operands (stmt, &TREE_OPERAND (expr, 2), uflags); |
0 | 931 } |
932 else if (code == ARRAY_REF || code == ARRAY_RANGE_REF) | |
933 { | |
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934 get_expr_operands (stmt, &TREE_OPERAND (expr, 1), uflags); |
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935 get_expr_operands (stmt, &TREE_OPERAND (expr, 2), uflags); |
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936 get_expr_operands (stmt, &TREE_OPERAND (expr, 3), uflags); |
0 | 937 } |
938 | |
939 return; | |
940 } | |
941 | |
942 case WITH_SIZE_EXPR: | |
943 /* WITH_SIZE_EXPR is a pass-through reference to its first argument, | |
944 and an rvalue reference to its second argument. */ | |
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945 get_expr_operands (stmt, &TREE_OPERAND (expr, 1), uflags); |
0 | 946 get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags); |
947 return; | |
948 | |
949 case COND_EXPR: | |
950 case VEC_COND_EXPR: | |
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951 get_expr_operands (stmt, &TREE_OPERAND (expr, 0), uflags); |
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952 get_expr_operands (stmt, &TREE_OPERAND (expr, 1), uflags); |
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953 get_expr_operands (stmt, &TREE_OPERAND (expr, 2), uflags); |
0 | 954 return; |
955 | |
956 case CONSTRUCTOR: | |
957 { | |
958 /* General aggregate CONSTRUCTORs have been decomposed, but they | |
959 are still in use as the COMPLEX_EXPR equivalent for vectors. */ | |
960 constructor_elt *ce; | |
961 unsigned HOST_WIDE_INT idx; | |
962 | |
963 for (idx = 0; | |
964 VEC_iterate (constructor_elt, CONSTRUCTOR_ELTS (expr), idx, ce); | |
965 idx++) | |
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966 get_expr_operands (stmt, &ce->value, uflags); |
0 | 967 |
968 return; | |
969 } | |
970 | |
971 case BIT_FIELD_REF: | |
972 if (TREE_THIS_VOLATILE (expr)) | |
973 gimple_set_has_volatile_ops (stmt, true); | |
974 /* FALLTHRU */ | |
975 | |
976 case TRUTH_NOT_EXPR: | |
977 case VIEW_CONVERT_EXPR: | |
978 do_unary: | |
979 get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags); | |
980 return; | |
981 | |
982 case TRUTH_AND_EXPR: | |
983 case TRUTH_OR_EXPR: | |
984 case TRUTH_XOR_EXPR: | |
985 case COMPOUND_EXPR: | |
986 case OBJ_TYPE_REF: | |
987 case ASSERT_EXPR: | |
988 do_binary: | |
989 { | |
990 get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags); | |
991 get_expr_operands (stmt, &TREE_OPERAND (expr, 1), flags); | |
992 return; | |
993 } | |
994 | |
995 case DOT_PROD_EXPR: | |
996 case REALIGN_LOAD_EXPR: | |
997 { | |
998 get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags); | |
999 get_expr_operands (stmt, &TREE_OPERAND (expr, 1), flags); | |
1000 get_expr_operands (stmt, &TREE_OPERAND (expr, 2), flags); | |
1001 return; | |
1002 } | |
1003 | |
1004 case FUNCTION_DECL: | |
1005 case LABEL_DECL: | |
1006 case CONST_DECL: | |
1007 case CASE_LABEL_EXPR: | |
1008 /* Expressions that make no memory references. */ | |
1009 return; | |
1010 | |
1011 default: | |
1012 if (codeclass == tcc_unary) | |
1013 goto do_unary; | |
1014 if (codeclass == tcc_binary || codeclass == tcc_comparison) | |
1015 goto do_binary; | |
1016 if (codeclass == tcc_constant || codeclass == tcc_type) | |
1017 return; | |
1018 } | |
1019 | |
1020 /* If we get here, something has gone wrong. */ | |
1021 #ifdef ENABLE_CHECKING | |
1022 fprintf (stderr, "unhandled expression in get_expr_operands():\n"); | |
1023 debug_tree (expr); | |
1024 fputs ("\n", stderr); | |
1025 #endif | |
1026 gcc_unreachable (); | |
1027 } | |
1028 | |
1029 | |
1030 /* Parse STMT looking for operands. When finished, the various | |
1031 build_* operand vectors will have potential operands in them. */ | |
1032 | |
1033 static void | |
1034 parse_ssa_operands (gimple stmt) | |
1035 { | |
1036 enum gimple_code code = gimple_code (stmt); | |
1037 | |
1038 if (code == GIMPLE_ASM) | |
1039 get_asm_expr_operands (stmt); | |
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1040 else if (is_gimple_debug (stmt)) |
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1041 { |
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1042 if (gimple_debug_bind_p (stmt) |
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1043 && gimple_debug_bind_has_value_p (stmt)) |
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1044 get_expr_operands (stmt, gimple_debug_bind_get_value_ptr (stmt), |
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1045 opf_use | opf_no_vops); |
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1046 } |
0 | 1047 else |
1048 { | |
1049 size_t i, start = 0; | |
1050 | |
1051 if (code == GIMPLE_ASSIGN || code == GIMPLE_CALL) | |
1052 { | |
1053 get_expr_operands (stmt, gimple_op_ptr (stmt, 0), opf_def); | |
1054 start = 1; | |
1055 } | |
1056 | |
1057 for (i = start; i < gimple_num_ops (stmt); i++) | |
1058 get_expr_operands (stmt, gimple_op_ptr (stmt, i), opf_use); | |
1059 | |
1060 /* Add call-clobbered operands, if needed. */ | |
1061 if (code == GIMPLE_CALL) | |
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1062 maybe_add_call_vops (stmt); |
0 | 1063 } |
1064 } | |
1065 | |
1066 | |
1067 /* Create an operands cache for STMT. */ | |
1068 | |
1069 static void | |
1070 build_ssa_operands (gimple stmt) | |
1071 { | |
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1072 /* Initially assume that the statement has no volatile operands. */ |
0 | 1073 gimple_set_has_volatile_ops (stmt, false); |
1074 | |
1075 start_ssa_stmt_operands (); | |
1076 parse_ssa_operands (stmt); | |
1077 finalize_ssa_stmt_operands (stmt); | |
1078 } | |
1079 | |
1080 | |
1081 /* Releases the operands of STMT back to their freelists, and clears | |
1082 the stmt operand lists. */ | |
1083 | |
1084 void | |
1085 free_stmt_operands (gimple stmt) | |
1086 { | |
1087 def_optype_p defs = gimple_def_ops (stmt), last_def; | |
1088 use_optype_p uses = gimple_use_ops (stmt), last_use; | |
1089 | |
1090 if (defs) | |
1091 { | |
1092 for (last_def = defs; last_def->next; last_def = last_def->next) | |
1093 continue; | |
1094 last_def->next = gimple_ssa_operands (cfun)->free_defs; | |
1095 gimple_ssa_operands (cfun)->free_defs = defs; | |
1096 gimple_set_def_ops (stmt, NULL); | |
1097 } | |
1098 | |
1099 if (uses) | |
1100 { | |
1101 for (last_use = uses; last_use->next; last_use = last_use->next) | |
1102 delink_imm_use (USE_OP_PTR (last_use)); | |
1103 delink_imm_use (USE_OP_PTR (last_use)); | |
1104 last_use->next = gimple_ssa_operands (cfun)->free_uses; | |
1105 gimple_ssa_operands (cfun)->free_uses = uses; | |
1106 gimple_set_use_ops (stmt, NULL); | |
1107 } | |
1108 | |
1109 if (gimple_has_mem_ops (stmt)) | |
1110 { | |
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1111 gimple_set_vuse (stmt, NULL_TREE); |
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1112 gimple_set_vdef (stmt, NULL_TREE); |
0 | 1113 } |
1114 } | |
1115 | |
1116 | |
1117 /* Get the operands of statement STMT. */ | |
1118 | |
1119 void | |
1120 update_stmt_operands (gimple stmt) | |
1121 { | |
1122 /* If update_stmt_operands is called before SSA is initialized, do | |
1123 nothing. */ | |
1124 if (!ssa_operands_active ()) | |
1125 return; | |
1126 | |
1127 timevar_push (TV_TREE_OPS); | |
1128 | |
1129 gcc_assert (gimple_modified_p (stmt)); | |
1130 build_ssa_operands (stmt); | |
1131 gimple_set_modified (stmt, false); | |
1132 | |
1133 timevar_pop (TV_TREE_OPS); | |
1134 } | |
1135 | |
1136 | |
1137 /* Swap operands EXP0 and EXP1 in statement STMT. No attempt is done | |
1138 to test the validity of the swap operation. */ | |
1139 | |
1140 void | |
1141 swap_tree_operands (gimple stmt, tree *exp0, tree *exp1) | |
1142 { | |
1143 tree op0, op1; | |
1144 op0 = *exp0; | |
1145 op1 = *exp1; | |
1146 | |
1147 /* If the operand cache is active, attempt to preserve the relative | |
1148 positions of these two operands in their respective immediate use | |
1149 lists. */ | |
1150 if (ssa_operands_active () && op0 != op1) | |
1151 { | |
1152 use_optype_p use0, use1, ptr; | |
1153 use0 = use1 = NULL; | |
1154 | |
1155 /* Find the 2 operands in the cache, if they are there. */ | |
1156 for (ptr = gimple_use_ops (stmt); ptr; ptr = ptr->next) | |
1157 if (USE_OP_PTR (ptr)->use == exp0) | |
1158 { | |
1159 use0 = ptr; | |
1160 break; | |
1161 } | |
1162 | |
1163 for (ptr = gimple_use_ops (stmt); ptr; ptr = ptr->next) | |
1164 if (USE_OP_PTR (ptr)->use == exp1) | |
1165 { | |
1166 use1 = ptr; | |
1167 break; | |
1168 } | |
1169 | |
1170 /* If both uses don't have operand entries, there isn't much we can do | |
1171 at this point. Presumably we don't need to worry about it. */ | |
1172 if (use0 && use1) | |
1173 { | |
1174 tree *tmp = USE_OP_PTR (use1)->use; | |
1175 USE_OP_PTR (use1)->use = USE_OP_PTR (use0)->use; | |
1176 USE_OP_PTR (use0)->use = tmp; | |
1177 } | |
1178 } | |
1179 | |
1180 /* Now swap the data. */ | |
1181 *exp0 = op1; | |
1182 *exp1 = op0; | |
1183 } | |
1184 | |
1185 | |
1186 /* Scan the immediate_use list for VAR making sure its linked properly. | |
1187 Return TRUE if there is a problem and emit an error message to F. */ | |
1188 | |
1189 bool | |
1190 verify_imm_links (FILE *f, tree var) | |
1191 { | |
1192 use_operand_p ptr, prev, list; | |
1193 int count; | |
1194 | |
1195 gcc_assert (TREE_CODE (var) == SSA_NAME); | |
1196 | |
1197 list = &(SSA_NAME_IMM_USE_NODE (var)); | |
1198 gcc_assert (list->use == NULL); | |
1199 | |
1200 if (list->prev == NULL) | |
1201 { | |
1202 gcc_assert (list->next == NULL); | |
1203 return false; | |
1204 } | |
1205 | |
1206 prev = list; | |
1207 count = 0; | |
1208 for (ptr = list->next; ptr != list; ) | |
1209 { | |
1210 if (prev != ptr->prev) | |
1211 goto error; | |
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1212 |
0 | 1213 if (ptr->use == NULL) |
1214 goto error; /* 2 roots, or SAFE guard node. */ | |
1215 else if (*(ptr->use) != var) | |
1216 goto error; | |
1217 | |
1218 prev = ptr; | |
1219 ptr = ptr->next; | |
1220 | |
1221 /* Avoid infinite loops. 50,000,000 uses probably indicates a | |
1222 problem. */ | |
1223 if (count++ > 50000000) | |
1224 goto error; | |
1225 } | |
1226 | |
1227 /* Verify list in the other direction. */ | |
1228 prev = list; | |
1229 for (ptr = list->prev; ptr != list; ) | |
1230 { | |
1231 if (prev != ptr->next) | |
1232 goto error; | |
1233 prev = ptr; | |
1234 ptr = ptr->prev; | |
1235 if (count-- < 0) | |
1236 goto error; | |
1237 } | |
1238 | |
1239 if (count != 0) | |
1240 goto error; | |
1241 | |
1242 return false; | |
1243 | |
1244 error: | |
1245 if (ptr->loc.stmt && gimple_modified_p (ptr->loc.stmt)) | |
1246 { | |
1247 fprintf (f, " STMT MODIFIED. - <%p> ", (void *)ptr->loc.stmt); | |
1248 print_gimple_stmt (f, ptr->loc.stmt, 0, TDF_SLIM); | |
1249 } | |
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1250 fprintf (f, " IMM ERROR : (use_p : tree - %p:%p)", (void *)ptr, |
0 | 1251 (void *)ptr->use); |
1252 print_generic_expr (f, USE_FROM_PTR (ptr), TDF_SLIM); | |
1253 fprintf(f, "\n"); | |
1254 return true; | |
1255 } | |
1256 | |
1257 | |
1258 /* Dump all the immediate uses to FILE. */ | |
1259 | |
1260 void | |
1261 dump_immediate_uses_for (FILE *file, tree var) | |
1262 { | |
1263 imm_use_iterator iter; | |
1264 use_operand_p use_p; | |
1265 | |
1266 gcc_assert (var && TREE_CODE (var) == SSA_NAME); | |
1267 | |
1268 print_generic_expr (file, var, TDF_SLIM); | |
1269 fprintf (file, " : -->"); | |
1270 if (has_zero_uses (var)) | |
1271 fprintf (file, " no uses.\n"); | |
1272 else | |
1273 if (has_single_use (var)) | |
1274 fprintf (file, " single use.\n"); | |
1275 else | |
1276 fprintf (file, "%d uses.\n", num_imm_uses (var)); | |
1277 | |
1278 FOR_EACH_IMM_USE_FAST (use_p, iter, var) | |
1279 { | |
1280 if (use_p->loc.stmt == NULL && use_p->use == NULL) | |
1281 fprintf (file, "***end of stmt iterator marker***\n"); | |
1282 else | |
1283 if (!is_gimple_reg (USE_FROM_PTR (use_p))) | |
1284 print_gimple_stmt (file, USE_STMT (use_p), 0, TDF_VOPS|TDF_MEMSYMS); | |
1285 else | |
1286 print_gimple_stmt (file, USE_STMT (use_p), 0, TDF_SLIM); | |
1287 } | |
1288 fprintf(file, "\n"); | |
1289 } | |
1290 | |
1291 | |
1292 /* Dump all the immediate uses to FILE. */ | |
1293 | |
1294 void | |
1295 dump_immediate_uses (FILE *file) | |
1296 { | |
1297 tree var; | |
1298 unsigned int x; | |
1299 | |
1300 fprintf (file, "Immediate_uses: \n\n"); | |
1301 for (x = 1; x < num_ssa_names; x++) | |
1302 { | |
1303 var = ssa_name(x); | |
1304 if (!var) | |
1305 continue; | |
1306 dump_immediate_uses_for (file, var); | |
1307 } | |
1308 } | |
1309 | |
1310 | |
1311 /* Dump def-use edges on stderr. */ | |
1312 | |
1313 void | |
1314 debug_immediate_uses (void) | |
1315 { | |
1316 dump_immediate_uses (stderr); | |
1317 } | |
1318 | |
1319 | |
1320 /* Dump def-use edges on stderr. */ | |
1321 | |
1322 void | |
1323 debug_immediate_uses_for (tree var) | |
1324 { | |
1325 dump_immediate_uses_for (stderr, var); | |
1326 } | |
1327 | |
1328 | |
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parents:
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1329 /* Unlink STMTs virtual definition from the IL by propagating its use. */ |
0 | 1330 |
1331 void | |
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1332 unlink_stmt_vdef (gimple stmt) |
0 | 1333 { |
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1334 use_operand_p use_p; |
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1335 imm_use_iterator iter; |
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1336 gimple use_stmt; |
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1337 tree vdef = gimple_vdef (stmt); |
0 | 1338 |
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1339 if (!vdef |
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1340 || TREE_CODE (vdef) != SSA_NAME) |
0 | 1341 return; |
1342 | |
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1343 FOR_EACH_IMM_USE_STMT (use_stmt, iter, gimple_vdef (stmt)) |
0 | 1344 { |
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1345 FOR_EACH_IMM_USE_ON_STMT (use_p, iter) |
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1346 SET_USE (use_p, gimple_vuse (stmt)); |
0 | 1347 } |
1348 | |
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1349 if (SSA_NAME_OCCURS_IN_ABNORMAL_PHI (gimple_vdef (stmt))) |
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1350 SSA_NAME_OCCURS_IN_ABNORMAL_PHI (gimple_vuse (stmt)) = 1; |
0 | 1351 } |
1352 |