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6de9cd9a | 1 | /* SSA operands management for trees. |
6615c446 | 2 | Copyright (C) 2003, 2004 Free Software Foundation, Inc. |
6de9cd9a DN |
3 | |
4 | This file is part of GCC. | |
5 | ||
6 | GCC is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2, or (at your option) | |
9 | any later version. | |
10 | ||
11 | GCC is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GCC; see the file COPYING. If not, write to | |
18 | the Free Software Foundation, 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. */ | |
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" | |
1e128c5f | 29 | #include "errors.h" |
6de9cd9a DN |
30 | #include "tree-flow.h" |
31 | #include "tree-inline.h" | |
32 | #include "tree-pass.h" | |
33 | #include "ggc.h" | |
34 | #include "timevar.h" | |
35 | ||
6674a6ce | 36 | #include "langhooks.h" |
1a24f92f | 37 | |
6cb38cd4 | 38 | /* This file contains the code required to manage the operands cache of the |
1a24f92f | 39 | SSA optimizer. For every stmt, we maintain an operand cache in the stmt |
6cb38cd4 | 40 | annotation. This cache contains operands that will be of interest to |
1a24f92f AM |
41 | optimizers and other passes wishing to manipulate the IL. |
42 | ||
43 | The operand type are broken up into REAL and VIRTUAL operands. The real | |
44 | operands are represented as pointers into the stmt's operand tree. Thus | |
45 | any manipulation of the real operands will be reflected in the actual tree. | |
46 | Virtual operands are represented solely in the cache, although the base | |
47 | variable for the SSA_NAME may, or may not occur in the stmt's tree. | |
48 | Manipulation of the virtual operands will not be reflected in the stmt tree. | |
49 | ||
50 | The routines in this file are concerned with creating this operand cache | |
51 | from a stmt tree. | |
52 | ||
53 | get_stmt_operands() in the primary entry point. | |
54 | ||
55 | The operand tree is the parsed by the various get_* routines which look | |
2a7e31df | 56 | through the stmt tree for the occurrence of operands which may be of |
1a24f92f AM |
57 | interest, and calls are made to the append_* routines whenever one is |
58 | found. There are 5 of these routines, each representing one of the | |
59 | 5 types of operands. Defs, Uses, Virtual Uses, Virtual May Defs, and | |
60 | Virtual Must Defs. | |
61 | ||
62 | The append_* routines check for duplication, and simply keep a list of | |
63 | unique objects for each operand type in the build_* extendable vectors. | |
64 | ||
65 | Once the stmt tree is completely parsed, the finalize_ssa_operands() | |
66 | routine is called, which proceeds to perform the finalization routine | |
67 | on each of the 5 operand vectors which have been built up. | |
68 | ||
69 | If the stmt had a previous operand cache, the finalization routines | |
70 | attempt to match up the new operands with the old ones. If its a perfect | |
71 | match, the old vector is simply reused. If it isn't a perfect match, then | |
72 | a new vector is created and the new operands are placed there. For | |
73 | virtual operands, if the previous cache had SSA_NAME version of a | |
74 | variable, and that same variable occurs in the same operands cache, then | |
75 | the new cache vector will also get the same SSA_NAME. | |
76 | ||
454ff5cb | 77 | i.e., if a stmt had a VUSE of 'a_5', and 'a' occurs in the new operand |
1a24f92f AM |
78 | vector for VUSE, then the new vector will also be modified such that |
79 | it contains 'a_5' rather than 'a'. | |
80 | ||
81 | */ | |
82 | ||
83 | ||
6de9cd9a DN |
84 | /* Flags to describe operand properties in get_stmt_operands and helpers. */ |
85 | ||
86 | /* By default, operands are loaded. */ | |
87 | #define opf_none 0 | |
88 | ||
a32b97a2 BB |
89 | /* Operand is the target of an assignment expression or a |
90 | call-clobbered variable */ | |
6de9cd9a DN |
91 | #define opf_is_def (1 << 0) |
92 | ||
a32b97a2 | 93 | /* Operand is the target of an assignment expression. */ |
50dc9a88 | 94 | #define opf_kill_def (1 << 1) |
a32b97a2 | 95 | |
6de9cd9a DN |
96 | /* No virtual operands should be created in the expression. This is used |
97 | when traversing ADDR_EXPR nodes which have different semantics than | |
98 | other expressions. Inside an ADDR_EXPR node, the only operands that we | |
99 | need to consider are indices into arrays. For instance, &a.b[i] should | |
100 | generate a USE of 'i' but it should not generate a VUSE for 'a' nor a | |
101 | VUSE for 'b'. */ | |
50dc9a88 | 102 | #define opf_no_vops (1 << 2) |
6de9cd9a DN |
103 | |
104 | /* Array for building all the def operands. */ | |
105 | static GTY (()) varray_type build_defs; | |
106 | ||
107 | /* Array for building all the use operands. */ | |
108 | static GTY (()) varray_type build_uses; | |
109 | ||
a32b97a2 BB |
110 | /* Array for building all the v_may_def operands. */ |
111 | static GTY (()) varray_type build_v_may_defs; | |
6de9cd9a DN |
112 | |
113 | /* Array for building all the vuse operands. */ | |
114 | static GTY (()) varray_type build_vuses; | |
115 | ||
a32b97a2 BB |
116 | /* Array for building all the v_must_def operands. */ |
117 | static GTY (()) varray_type build_v_must_defs; | |
118 | ||
4c124b4c | 119 | |
6de9cd9a | 120 | #ifdef ENABLE_CHECKING |
1a24f92f | 121 | /* Used to make sure operand construction is working on the proper stmt. */ |
6de9cd9a DN |
122 | tree check_build_stmt; |
123 | #endif | |
124 | ||
4c124b4c AM |
125 | def_operand_p NULL_DEF_OPERAND_P = { NULL }; |
126 | use_operand_p NULL_USE_OPERAND_P = { NULL }; | |
127 | ||
6de9cd9a | 128 | static void note_addressable (tree, stmt_ann_t); |
1a24f92f AM |
129 | static void get_expr_operands (tree, tree *, int); |
130 | static void get_asm_expr_operands (tree); | |
131 | static void get_indirect_ref_operands (tree, tree, int); | |
132 | static void get_call_expr_operands (tree, tree); | |
133 | static inline void append_def (tree *); | |
134 | static inline void append_use (tree *); | |
135 | static void append_v_may_def (tree); | |
136 | static void append_v_must_def (tree); | |
85c33455 KZ |
137 | static void add_call_clobber_ops (tree); |
138 | static void add_call_read_ops (tree); | |
1a24f92f AM |
139 | static void add_stmt_operand (tree *, tree, int); |
140 | ||
141 | /* Return a vector of contiguous memory for NUM def operands. */ | |
6de9cd9a | 142 | |
6de9cd9a DN |
143 | static inline def_optype |
144 | allocate_def_optype (unsigned num) | |
145 | { | |
146 | def_optype def_ops; | |
147 | unsigned size; | |
148 | size = sizeof (struct def_optype_d) + sizeof (tree *) * (num - 1); | |
d00ad49b | 149 | def_ops = ggc_alloc (size); |
6de9cd9a DN |
150 | def_ops->num_defs = num; |
151 | return def_ops; | |
152 | } | |
153 | ||
1a24f92f AM |
154 | |
155 | /* Return a vector of contiguous memory for NUM use operands. */ | |
156 | ||
6de9cd9a DN |
157 | static inline use_optype |
158 | allocate_use_optype (unsigned num) | |
159 | { | |
160 | use_optype use_ops; | |
161 | unsigned size; | |
162 | size = sizeof (struct use_optype_d) + sizeof (tree *) * (num - 1); | |
d00ad49b | 163 | use_ops = ggc_alloc (size); |
6de9cd9a DN |
164 | use_ops->num_uses = num; |
165 | return use_ops; | |
166 | } | |
167 | ||
1a24f92f AM |
168 | |
169 | /* Return a vector of contiguous memory for NUM v_may_def operands. */ | |
170 | ||
a32b97a2 BB |
171 | static inline v_may_def_optype |
172 | allocate_v_may_def_optype (unsigned num) | |
6de9cd9a | 173 | { |
a32b97a2 | 174 | v_may_def_optype v_may_def_ops; |
6de9cd9a | 175 | unsigned size; |
1a24f92f | 176 | size = sizeof (struct v_may_def_optype_d) |
52328bf6 | 177 | + sizeof (v_def_use_operand_type_t) * (num - 1); |
d00ad49b | 178 | v_may_def_ops = ggc_alloc (size); |
a32b97a2 BB |
179 | v_may_def_ops->num_v_may_defs = num; |
180 | return v_may_def_ops; | |
6de9cd9a DN |
181 | } |
182 | ||
1a24f92f AM |
183 | |
184 | /* Return a vector of contiguous memory for NUM v_use operands. */ | |
185 | ||
6de9cd9a DN |
186 | static inline vuse_optype |
187 | allocate_vuse_optype (unsigned num) | |
188 | { | |
189 | vuse_optype vuse_ops; | |
190 | unsigned size; | |
191 | size = sizeof (struct vuse_optype_d) + sizeof (tree) * (num - 1); | |
d00ad49b | 192 | vuse_ops = ggc_alloc (size); |
6de9cd9a DN |
193 | vuse_ops->num_vuses = num; |
194 | return vuse_ops; | |
195 | } | |
196 | ||
1a24f92f AM |
197 | |
198 | /* Return a vector of contiguous memory for NUM v_must_def operands. */ | |
199 | ||
a32b97a2 BB |
200 | static inline v_must_def_optype |
201 | allocate_v_must_def_optype (unsigned num) | |
202 | { | |
203 | v_must_def_optype v_must_def_ops; | |
204 | unsigned size; | |
52328bf6 | 205 | size = sizeof (struct v_must_def_optype_d) + sizeof (v_def_use_operand_type_t) * (num - 1); |
d00ad49b | 206 | v_must_def_ops = ggc_alloc (size); |
a32b97a2 BB |
207 | v_must_def_ops->num_v_must_defs = num; |
208 | return v_must_def_ops; | |
209 | } | |
210 | ||
1a24f92f AM |
211 | |
212 | /* Free memory for USES. */ | |
213 | ||
6de9cd9a | 214 | static inline void |
1a24f92f | 215 | free_uses (use_optype *uses) |
6de9cd9a DN |
216 | { |
217 | if (*uses) | |
218 | { | |
1a24f92f | 219 | ggc_free (*uses); |
6de9cd9a DN |
220 | *uses = NULL; |
221 | } | |
222 | } | |
223 | ||
1a24f92f AM |
224 | |
225 | /* Free memory for DEFS. */ | |
226 | ||
6de9cd9a | 227 | static inline void |
1a24f92f | 228 | free_defs (def_optype *defs) |
6de9cd9a DN |
229 | { |
230 | if (*defs) | |
231 | { | |
1a24f92f | 232 | ggc_free (*defs); |
6de9cd9a DN |
233 | *defs = NULL; |
234 | } | |
235 | } | |
236 | ||
1a24f92f AM |
237 | |
238 | /* Free memory for VUSES. */ | |
239 | ||
6de9cd9a | 240 | static inline void |
1a24f92f | 241 | free_vuses (vuse_optype *vuses) |
6de9cd9a DN |
242 | { |
243 | if (*vuses) | |
244 | { | |
1a24f92f | 245 | ggc_free (*vuses); |
6de9cd9a DN |
246 | *vuses = NULL; |
247 | } | |
248 | } | |
249 | ||
1a24f92f AM |
250 | |
251 | /* Free memory for V_MAY_DEFS. */ | |
252 | ||
6de9cd9a | 253 | static inline void |
1a24f92f | 254 | free_v_may_defs (v_may_def_optype *v_may_defs) |
a32b97a2 BB |
255 | { |
256 | if (*v_may_defs) | |
257 | { | |
1a24f92f | 258 | ggc_free (*v_may_defs); |
a32b97a2 BB |
259 | *v_may_defs = NULL; |
260 | } | |
261 | } | |
262 | ||
1a24f92f AM |
263 | |
264 | /* Free memory for V_MUST_DEFS. */ | |
265 | ||
a32b97a2 | 266 | static inline void |
1a24f92f | 267 | free_v_must_defs (v_must_def_optype *v_must_defs) |
6de9cd9a | 268 | { |
a32b97a2 | 269 | if (*v_must_defs) |
6de9cd9a | 270 | { |
1a24f92f | 271 | ggc_free (*v_must_defs); |
a32b97a2 | 272 | *v_must_defs = NULL; |
6de9cd9a DN |
273 | } |
274 | } | |
275 | ||
6de9cd9a | 276 | |
1a24f92f | 277 | /* Initialize the operand cache routines. */ |
6de9cd9a DN |
278 | |
279 | void | |
280 | init_ssa_operands (void) | |
281 | { | |
6de9cd9a DN |
282 | VARRAY_TREE_PTR_INIT (build_defs, 5, "build defs"); |
283 | VARRAY_TREE_PTR_INIT (build_uses, 10, "build uses"); | |
a32b97a2 | 284 | VARRAY_TREE_INIT (build_v_may_defs, 10, "build v_may_defs"); |
6de9cd9a | 285 | VARRAY_TREE_INIT (build_vuses, 10, "build vuses"); |
a32b97a2 | 286 | VARRAY_TREE_INIT (build_v_must_defs, 10, "build v_must_defs"); |
6de9cd9a DN |
287 | } |
288 | ||
1a24f92f AM |
289 | |
290 | /* Dispose of anything required by the operand routines. */ | |
291 | ||
6de9cd9a DN |
292 | void |
293 | fini_ssa_operands (void) | |
294 | { | |
1e3e17d3 JH |
295 | ggc_free (build_defs); |
296 | ggc_free (build_uses); | |
297 | ggc_free (build_v_may_defs); | |
298 | ggc_free (build_vuses); | |
299 | ggc_free (build_v_must_defs); | |
300 | build_defs = NULL; | |
301 | build_uses = NULL; | |
302 | build_v_may_defs = NULL; | |
303 | build_vuses = NULL; | |
304 | build_v_must_defs = NULL; | |
6de9cd9a DN |
305 | } |
306 | ||
1a24f92f AM |
307 | |
308 | /* All the finalize_ssa_* routines do the work required to turn the build_ | |
309 | VARRAY into an operand_vector of the appropriate type. The original vector, | |
310 | if any, is passed in for comparison and virtual SSA_NAME reuse. If the | |
311 | old vector is reused, the pointer passed in is set to NULL so that | |
312 | the memory is not freed when the old operands are freed. */ | |
313 | ||
314 | /* Return a new def operand vector for STMT, comparing to OLD_OPS_P. */ | |
315 | ||
316 | static def_optype | |
317 | finalize_ssa_defs (def_optype *old_ops_p, tree stmt ATTRIBUTE_UNUSED) | |
6de9cd9a DN |
318 | { |
319 | unsigned num, x; | |
1a24f92f AM |
320 | def_optype def_ops, old_ops; |
321 | bool build_diff; | |
6de9cd9a DN |
322 | |
323 | num = VARRAY_ACTIVE_SIZE (build_defs); | |
324 | if (num == 0) | |
1a24f92f | 325 | return NULL; |
6de9cd9a | 326 | |
6de9cd9a | 327 | /* There should only be a single real definition per assignment. */ |
1e128c5f | 328 | gcc_assert (TREE_CODE (stmt) != MODIFY_EXPR || num <= 1); |
6de9cd9a | 329 | |
1a24f92f AM |
330 | old_ops = *old_ops_p; |
331 | ||
332 | /* Compare old vector and new array. */ | |
333 | build_diff = true; | |
334 | if (old_ops && old_ops->num_defs == num) | |
335 | { | |
336 | build_diff = false; | |
337 | for (x = 0; x < num; x++) | |
338 | if (old_ops->defs[x].def != VARRAY_TREE_PTR (build_defs, x)) | |
339 | { | |
340 | build_diff = true; | |
341 | break; | |
342 | } | |
343 | } | |
344 | ||
345 | if (!build_diff) | |
346 | { | |
347 | def_ops = old_ops; | |
348 | *old_ops_p = NULL; | |
349 | } | |
350 | else | |
351 | { | |
352 | def_ops = allocate_def_optype (num); | |
353 | for (x = 0; x < num ; x++) | |
354 | def_ops->defs[x].def = VARRAY_TREE_PTR (build_defs, x); | |
355 | } | |
356 | ||
6de9cd9a DN |
357 | VARRAY_POP_ALL (build_defs); |
358 | ||
1a24f92f | 359 | return def_ops; |
6de9cd9a DN |
360 | } |
361 | ||
1a24f92f AM |
362 | |
363 | /* Return a new use operand vector for STMT, comparing to OLD_OPS_P. */ | |
364 | ||
365 | static use_optype | |
366 | finalize_ssa_uses (use_optype *old_ops_p, tree stmt ATTRIBUTE_UNUSED) | |
6de9cd9a DN |
367 | { |
368 | unsigned num, x; | |
1a24f92f AM |
369 | use_optype use_ops, old_ops; |
370 | bool build_diff; | |
6de9cd9a DN |
371 | |
372 | num = VARRAY_ACTIVE_SIZE (build_uses); | |
373 | if (num == 0) | |
1a24f92f | 374 | return NULL; |
6de9cd9a DN |
375 | |
376 | #ifdef ENABLE_CHECKING | |
377 | { | |
378 | unsigned x; | |
379 | /* If the pointer to the operand is the statement itself, something is | |
380 | wrong. It means that we are pointing to a local variable (the | |
381 | initial call to get_stmt_operands does not pass a pointer to a | |
382 | statement). */ | |
383 | for (x = 0; x < num; x++) | |
1e128c5f | 384 | gcc_assert (*(VARRAY_TREE_PTR (build_uses, x)) != stmt); |
6de9cd9a DN |
385 | } |
386 | #endif | |
1a24f92f | 387 | old_ops = *old_ops_p; |
6de9cd9a | 388 | |
1a24f92f AM |
389 | /* Check if the old vector and the new array are the same. */ |
390 | build_diff = true; | |
391 | if (old_ops && old_ops->num_uses == num) | |
392 | { | |
393 | build_diff = false; | |
394 | for (x = 0; x < num; x++) | |
395 | if (old_ops->uses[x].use != VARRAY_TREE_PTR (build_uses, x)) | |
396 | { | |
397 | build_diff = true; | |
398 | break; | |
399 | } | |
400 | } | |
401 | ||
402 | if (!build_diff) | |
403 | { | |
404 | use_ops = old_ops; | |
405 | *old_ops_p = NULL; | |
406 | } | |
407 | else | |
408 | { | |
409 | use_ops = allocate_use_optype (num); | |
410 | for (x = 0; x < num ; x++) | |
411 | use_ops->uses[x].use = VARRAY_TREE_PTR (build_uses, x); | |
412 | } | |
6de9cd9a DN |
413 | VARRAY_POP_ALL (build_uses); |
414 | ||
1a24f92f | 415 | return use_ops; |
6de9cd9a DN |
416 | } |
417 | ||
1a24f92f AM |
418 | |
419 | /* Return a new v_may_def operand vector for STMT, comparing to OLD_OPS_P. */ | |
420 | ||
421 | static v_may_def_optype | |
422 | finalize_ssa_v_may_defs (v_may_def_optype *old_ops_p) | |
6de9cd9a | 423 | { |
1a24f92f AM |
424 | unsigned num, x, i, old_num; |
425 | v_may_def_optype v_may_def_ops, old_ops; | |
426 | tree result, var; | |
427 | bool build_diff; | |
6de9cd9a | 428 | |
a32b97a2 | 429 | num = VARRAY_ACTIVE_SIZE (build_v_may_defs); |
6de9cd9a | 430 | if (num == 0) |
1a24f92f | 431 | return NULL; |
6de9cd9a | 432 | |
1a24f92f | 433 | old_ops = *old_ops_p; |
6de9cd9a | 434 | |
1a24f92f AM |
435 | /* Check if the old vector and the new array are the same. */ |
436 | build_diff = true; | |
437 | if (old_ops && old_ops->num_v_may_defs == num) | |
438 | { | |
439 | old_num = num; | |
440 | build_diff = false; | |
441 | for (x = 0; x < num; x++) | |
442 | { | |
443 | var = old_ops->v_may_defs[x].def; | |
444 | if (TREE_CODE (var) == SSA_NAME) | |
445 | var = SSA_NAME_VAR (var); | |
446 | if (var != VARRAY_TREE (build_v_may_defs, x)) | |
447 | { | |
448 | build_diff = true; | |
449 | break; | |
450 | } | |
451 | } | |
452 | } | |
453 | else | |
454 | old_num = (old_ops ? old_ops->num_v_may_defs : 0); | |
6de9cd9a | 455 | |
1a24f92f AM |
456 | if (!build_diff) |
457 | { | |
458 | v_may_def_ops = old_ops; | |
459 | *old_ops_p = NULL; | |
460 | } | |
461 | else | |
462 | { | |
463 | v_may_def_ops = allocate_v_may_def_optype (num); | |
464 | for (x = 0; x < num; x++) | |
465 | { | |
466 | var = VARRAY_TREE (build_v_may_defs, x); | |
467 | /* Look for VAR in the old operands vector. */ | |
468 | for (i = 0; i < old_num; i++) | |
469 | { | |
470 | result = old_ops->v_may_defs[i].def; | |
471 | if (TREE_CODE (result) == SSA_NAME) | |
472 | result = SSA_NAME_VAR (result); | |
473 | if (result == var) | |
474 | { | |
475 | v_may_def_ops->v_may_defs[x] = old_ops->v_may_defs[i]; | |
476 | break; | |
477 | } | |
478 | } | |
479 | if (i == old_num) | |
480 | { | |
481 | v_may_def_ops->v_may_defs[x].def = var; | |
482 | v_may_def_ops->v_may_defs[x].use = var; | |
483 | } | |
484 | } | |
485 | } | |
486 | ||
487 | /* Empty the V_MAY_DEF build vector after VUSES have been processed. */ | |
488 | ||
489 | return v_may_def_ops; | |
6de9cd9a DN |
490 | } |
491 | ||
6de9cd9a | 492 | |
1a24f92f AM |
493 | /* Return a new vuse operand vector, comparing to OLD_OPS_P. */ |
494 | ||
495 | static vuse_optype | |
496 | finalize_ssa_vuses (vuse_optype *old_ops_p) | |
497 | { | |
498 | unsigned num, x, i, num_v_may_defs, old_num; | |
499 | vuse_optype vuse_ops, old_ops; | |
500 | bool build_diff; | |
6de9cd9a DN |
501 | |
502 | num = VARRAY_ACTIVE_SIZE (build_vuses); | |
503 | if (num == 0) | |
1a24f92f AM |
504 | { |
505 | VARRAY_POP_ALL (build_v_may_defs); | |
506 | return NULL; | |
507 | } | |
6de9cd9a DN |
508 | |
509 | /* Remove superfluous VUSE operands. If the statement already has a | |
a32b97a2 BB |
510 | V_MAY_DEF operation for a variable 'a', then a VUSE for 'a' is not |
511 | needed because V_MAY_DEFs imply a VUSE of the variable. For instance, | |
6de9cd9a DN |
512 | suppose that variable 'a' is aliased: |
513 | ||
514 | # VUSE <a_2> | |
a32b97a2 | 515 | # a_3 = V_MAY_DEF <a_2> |
6de9cd9a DN |
516 | a = a + 1; |
517 | ||
a32b97a2 | 518 | The VUSE <a_2> is superfluous because it is implied by the V_MAY_DEF |
6de9cd9a DN |
519 | operation. */ |
520 | ||
1a24f92f AM |
521 | num_v_may_defs = VARRAY_ACTIVE_SIZE (build_v_may_defs); |
522 | ||
523 | if (num_v_may_defs > 0) | |
6de9cd9a DN |
524 | { |
525 | size_t i, j; | |
1a24f92f | 526 | tree vuse; |
6de9cd9a DN |
527 | for (i = 0; i < VARRAY_ACTIVE_SIZE (build_vuses); i++) |
528 | { | |
1a24f92f AM |
529 | vuse = VARRAY_TREE (build_vuses, i); |
530 | for (j = 0; j < num_v_may_defs; j++) | |
6de9cd9a | 531 | { |
1a24f92f | 532 | if (vuse == VARRAY_TREE (build_v_may_defs, j)) |
6de9cd9a | 533 | break; |
6de9cd9a DN |
534 | } |
535 | ||
536 | /* If we found a useless VUSE operand, remove it from the | |
537 | operand array by replacing it with the last active element | |
538 | in the operand array (unless the useless VUSE was the | |
539 | last operand, in which case we simply remove it. */ | |
1a24f92f | 540 | if (j != num_v_may_defs) |
6de9cd9a DN |
541 | { |
542 | if (i != VARRAY_ACTIVE_SIZE (build_vuses) - 1) | |
543 | { | |
544 | VARRAY_TREE (build_vuses, i) | |
545 | = VARRAY_TREE (build_vuses, | |
546 | VARRAY_ACTIVE_SIZE (build_vuses) - 1); | |
547 | } | |
548 | VARRAY_POP (build_vuses); | |
549 | ||
550 | /* We want to rescan the element at this index, unless | |
551 | this was the last element, in which case the loop | |
552 | terminates. */ | |
553 | i--; | |
554 | } | |
555 | } | |
556 | } | |
557 | ||
558 | num = VARRAY_ACTIVE_SIZE (build_vuses); | |
559 | /* We could have reduced the size to zero now, however. */ | |
560 | if (num == 0) | |
1a24f92f AM |
561 | { |
562 | VARRAY_POP_ALL (build_v_may_defs); | |
563 | return NULL; | |
564 | } | |
565 | ||
566 | old_ops = *old_ops_p; | |
567 | ||
568 | /* Determine whether vuses is the same as the old vector. */ | |
569 | build_diff = true; | |
570 | if (old_ops && old_ops->num_vuses == num) | |
571 | { | |
572 | old_num = num; | |
573 | build_diff = false; | |
574 | for (x = 0; x < num ; x++) | |
575 | { | |
576 | tree v; | |
577 | v = old_ops->vuses[x]; | |
578 | if (TREE_CODE (v) == SSA_NAME) | |
579 | v = SSA_NAME_VAR (v); | |
580 | if (v != VARRAY_TREE (build_vuses, x)) | |
581 | { | |
582 | build_diff = true; | |
583 | break; | |
584 | } | |
585 | } | |
586 | } | |
587 | else | |
588 | old_num = (old_ops ? old_ops->num_vuses : 0); | |
6de9cd9a | 589 | |
1a24f92f AM |
590 | if (!build_diff) |
591 | { | |
592 | vuse_ops = old_ops; | |
593 | *old_ops_p = NULL; | |
594 | } | |
595 | else | |
596 | { | |
597 | vuse_ops = allocate_vuse_optype (num); | |
598 | for (x = 0; x < num; x++) | |
599 | { | |
600 | tree result, var = VARRAY_TREE (build_vuses, x); | |
601 | /* Look for VAR in the old vector, and use that SSA_NAME. */ | |
602 | for (i = 0; i < old_num; i++) | |
603 | { | |
604 | result = old_ops->vuses[i]; | |
605 | if (TREE_CODE (result) == SSA_NAME) | |
606 | result = SSA_NAME_VAR (result); | |
607 | if (result == var) | |
608 | { | |
609 | vuse_ops->vuses[x] = old_ops->vuses[i]; | |
610 | break; | |
611 | } | |
612 | } | |
613 | if (i == old_num) | |
614 | vuse_ops->vuses[x] = var; | |
615 | } | |
616 | } | |
617 | ||
618 | /* The v_may_def build vector wasn't freed because we needed it here. | |
619 | Free it now with the vuses build vector. */ | |
620 | VARRAY_POP_ALL (build_vuses); | |
621 | VARRAY_POP_ALL (build_v_may_defs); | |
622 | ||
623 | return vuse_ops; | |
6de9cd9a DN |
624 | } |
625 | ||
1a24f92f AM |
626 | /* Return a new v_must_def operand vector for STMT, comparing to OLD_OPS_P. */ |
627 | ||
628 | static v_must_def_optype | |
629 | finalize_ssa_v_must_defs (v_must_def_optype *old_ops_p, | |
630 | tree stmt ATTRIBUTE_UNUSED) | |
a32b97a2 | 631 | { |
1a24f92f AM |
632 | unsigned num, x, i, old_num = 0; |
633 | v_must_def_optype v_must_def_ops, old_ops; | |
634 | bool build_diff; | |
a32b97a2 BB |
635 | |
636 | num = VARRAY_ACTIVE_SIZE (build_v_must_defs); | |
637 | if (num == 0) | |
1a24f92f | 638 | return NULL; |
a32b97a2 | 639 | |
a32b97a2 | 640 | /* There should only be a single V_MUST_DEF per assignment. */ |
1e128c5f | 641 | gcc_assert (TREE_CODE (stmt) != MODIFY_EXPR || num <= 1); |
a32b97a2 | 642 | |
1a24f92f AM |
643 | old_ops = *old_ops_p; |
644 | ||
645 | /* Check if the old vector and the new array are the same. */ | |
646 | build_diff = true; | |
647 | if (old_ops && old_ops->num_v_must_defs == num) | |
648 | { | |
649 | old_num = num; | |
650 | build_diff = false; | |
651 | for (x = 0; x < num; x++) | |
652 | { | |
52328bf6 | 653 | tree var = old_ops->v_must_defs[x].def; |
1a24f92f AM |
654 | if (TREE_CODE (var) == SSA_NAME) |
655 | var = SSA_NAME_VAR (var); | |
656 | if (var != VARRAY_TREE (build_v_must_defs, x)) | |
657 | { | |
658 | build_diff = true; | |
659 | break; | |
660 | } | |
661 | } | |
662 | } | |
663 | else | |
664 | old_num = (old_ops ? old_ops->num_v_must_defs : 0); | |
665 | ||
666 | if (!build_diff) | |
667 | { | |
668 | v_must_def_ops = old_ops; | |
669 | *old_ops_p = NULL; | |
670 | } | |
671 | else | |
672 | { | |
673 | v_must_def_ops = allocate_v_must_def_optype (num); | |
674 | for (x = 0; x < num ; x++) | |
675 | { | |
676 | tree result, var = VARRAY_TREE (build_v_must_defs, x); | |
677 | /* Look for VAR in the original vector. */ | |
678 | for (i = 0; i < old_num; i++) | |
679 | { | |
52328bf6 | 680 | result = old_ops->v_must_defs[i].def; |
1a24f92f AM |
681 | if (TREE_CODE (result) == SSA_NAME) |
682 | result = SSA_NAME_VAR (result); | |
683 | if (result == var) | |
684 | { | |
52328bf6 DB |
685 | v_must_def_ops->v_must_defs[x].def = old_ops->v_must_defs[i].def; |
686 | v_must_def_ops->v_must_defs[x].use = old_ops->v_must_defs[i].use; | |
1a24f92f AM |
687 | break; |
688 | } | |
689 | } | |
690 | if (i == old_num) | |
52328bf6 DB |
691 | { |
692 | v_must_def_ops->v_must_defs[x].def = var; | |
693 | v_must_def_ops->v_must_defs[x].use = var; | |
694 | } | |
1a24f92f AM |
695 | } |
696 | } | |
a32b97a2 BB |
697 | VARRAY_POP_ALL (build_v_must_defs); |
698 | ||
1a24f92f | 699 | return v_must_def_ops; |
a32b97a2 BB |
700 | } |
701 | ||
6de9cd9a | 702 | |
1a24f92f | 703 | /* Finalize all the build vectors, fill the new ones into INFO. */ |
6de9cd9a | 704 | |
1a24f92f AM |
705 | static inline void |
706 | finalize_ssa_stmt_operands (tree stmt, stmt_operands_p old_ops, | |
707 | stmt_operands_p new_ops) | |
708 | { | |
709 | new_ops->def_ops = finalize_ssa_defs (&(old_ops->def_ops), stmt); | |
710 | new_ops->use_ops = finalize_ssa_uses (&(old_ops->use_ops), stmt); | |
711 | new_ops->v_must_def_ops | |
712 | = finalize_ssa_v_must_defs (&(old_ops->v_must_def_ops), stmt); | |
713 | new_ops->v_may_def_ops = finalize_ssa_v_may_defs (&(old_ops->v_may_def_ops)); | |
714 | new_ops->vuse_ops = finalize_ssa_vuses (&(old_ops->vuse_ops)); | |
6de9cd9a DN |
715 | } |
716 | ||
717 | ||
1a24f92f AM |
718 | /* Start the process of building up operands vectors in INFO. */ |
719 | ||
720 | static inline void | |
721 | start_ssa_stmt_operands (void) | |
6de9cd9a | 722 | { |
1e128c5f GB |
723 | gcc_assert (VARRAY_ACTIVE_SIZE (build_defs) == 0); |
724 | gcc_assert (VARRAY_ACTIVE_SIZE (build_uses) == 0); | |
725 | gcc_assert (VARRAY_ACTIVE_SIZE (build_vuses) == 0); | |
726 | gcc_assert (VARRAY_ACTIVE_SIZE (build_v_may_defs) == 0); | |
727 | gcc_assert (VARRAY_ACTIVE_SIZE (build_v_must_defs) == 0); | |
6de9cd9a DN |
728 | } |
729 | ||
730 | ||
1a24f92f | 731 | /* Add DEF_P to the list of pointers to operands. */ |
6de9cd9a DN |
732 | |
733 | static inline void | |
1a24f92f | 734 | append_def (tree *def_p) |
6de9cd9a | 735 | { |
6de9cd9a DN |
736 | VARRAY_PUSH_TREE_PTR (build_defs, def_p); |
737 | } | |
738 | ||
739 | ||
1a24f92f | 740 | /* Add USE_P to the list of pointers to operands. */ |
6de9cd9a DN |
741 | |
742 | static inline void | |
1a24f92f | 743 | append_use (tree *use_p) |
6de9cd9a | 744 | { |
6de9cd9a DN |
745 | VARRAY_PUSH_TREE_PTR (build_uses, use_p); |
746 | } | |
747 | ||
748 | ||
1a24f92f | 749 | /* Add a new virtual may def for variable VAR to the build array. */ |
6de9cd9a | 750 | |
1a24f92f AM |
751 | static inline void |
752 | append_v_may_def (tree var) | |
6de9cd9a | 753 | { |
1a24f92f | 754 | unsigned i; |
6de9cd9a DN |
755 | |
756 | /* Don't allow duplicate entries. */ | |
1a24f92f AM |
757 | for (i = 0; i < VARRAY_ACTIVE_SIZE (build_v_may_defs); i++) |
758 | if (var == VARRAY_TREE (build_v_may_defs, i)) | |
759 | return; | |
6de9cd9a | 760 | |
1a24f92f | 761 | VARRAY_PUSH_TREE (build_v_may_defs, var); |
6de9cd9a DN |
762 | } |
763 | ||
764 | ||
1a24f92f | 765 | /* Add VAR to the list of virtual uses. */ |
6de9cd9a | 766 | |
1a24f92f AM |
767 | static inline void |
768 | append_vuse (tree var) | |
6de9cd9a | 769 | { |
6de9cd9a | 770 | size_t i; |
6de9cd9a DN |
771 | |
772 | /* Don't allow duplicate entries. */ | |
773 | for (i = 0; i < VARRAY_ACTIVE_SIZE (build_vuses); i++) | |
1a24f92f AM |
774 | if (var == VARRAY_TREE (build_vuses, i)) |
775 | return; | |
6de9cd9a DN |
776 | |
777 | VARRAY_PUSH_TREE (build_vuses, var); | |
778 | } | |
779 | ||
a32b97a2 | 780 | |
1a24f92f | 781 | /* Add VAR to the list of virtual must definitions for INFO. */ |
a32b97a2 | 782 | |
1a24f92f AM |
783 | static inline void |
784 | append_v_must_def (tree var) | |
785 | { | |
786 | unsigned i; | |
a32b97a2 BB |
787 | |
788 | /* Don't allow duplicate entries. */ | |
789 | for (i = 0; i < VARRAY_ACTIVE_SIZE (build_v_must_defs); i++) | |
1a24f92f AM |
790 | if (var == VARRAY_TREE (build_v_must_defs, i)) |
791 | return; | |
a32b97a2 BB |
792 | |
793 | VARRAY_PUSH_TREE (build_v_must_defs, var); | |
794 | } | |
795 | ||
1a24f92f AM |
796 | /* Create an operands cache for STMT, returning it in NEW_OPS. OLD_OPS are the |
797 | original operands, and if ANN is non-null, appropriate stmt flags are set | |
798 | in the stmt's annotation. Note that some fields in old_ops may | |
799 | change to NULL, although none of the memory they originally pointed to | |
800 | will be destroyed. It is appropriate to call free_stmt_operands() on | |
801 | the value returned in old_ops. | |
6de9cd9a | 802 | |
6cb38cd4 | 803 | The rationale for this: Certain optimizations wish to examine the difference |
1a24f92f AM |
804 | between new_ops and old_ops after processing. If a set of operands don't |
805 | change, new_ops will simply assume the pointer in old_ops, and the old_ops | |
806 | pointer will be set to NULL, indicating no memory needs to be cleared. | |
807 | Usage might appear something like: | |
6de9cd9a | 808 | |
1a24f92f AM |
809 | old_ops_copy = old_ops = stmt_ann(stmt)->operands; |
810 | build_ssa_operands (stmt, NULL, &old_ops, &new_ops); | |
811 | <* compare old_ops_copy and new_ops *> | |
812 | free_ssa_operands (old_ops); */ | |
6de9cd9a DN |
813 | |
814 | void | |
1a24f92f AM |
815 | build_ssa_operands (tree stmt, stmt_ann_t ann, stmt_operands_p old_ops, |
816 | stmt_operands_p new_ops) | |
6de9cd9a DN |
817 | { |
818 | enum tree_code code; | |
1a24f92f AM |
819 | tree_ann_t saved_ann = stmt->common.ann; |
820 | ||
821 | /* Replace stmt's annotation with the one passed in for the duration | |
822 | of the operand building process. This allows "fake" stmts to be built | |
823 | and not be included in other data structures which can be built here. */ | |
824 | stmt->common.ann = (tree_ann_t) ann; | |
825 | ||
9098a3ec RH |
826 | /* Initially assume that the statement has no volatile operands, nor |
827 | makes aliased loads or stores. */ | |
1a24f92f AM |
828 | if (ann) |
829 | { | |
830 | ann->has_volatile_ops = false; | |
831 | ann->makes_aliased_stores = false; | |
832 | ann->makes_aliased_loads = false; | |
833 | } | |
6de9cd9a | 834 | |
1a24f92f | 835 | start_ssa_stmt_operands (); |
6de9cd9a DN |
836 | |
837 | code = TREE_CODE (stmt); | |
838 | switch (code) | |
839 | { | |
840 | case MODIFY_EXPR: | |
1a24f92f | 841 | get_expr_operands (stmt, &TREE_OPERAND (stmt, 1), opf_none); |
a32b97a2 | 842 | if (TREE_CODE (TREE_OPERAND (stmt, 0)) == ARRAY_REF |
a9315f66 RK |
843 | || TREE_CODE (TREE_OPERAND (stmt, 0)) == ARRAY_RANGE_REF |
844 | || TREE_CODE (TREE_OPERAND (stmt, 0)) == COMPONENT_REF | |
a32b97a2 | 845 | || TREE_CODE (TREE_OPERAND (stmt, 0)) == REALPART_EXPR |
67c605a5 JM |
846 | || TREE_CODE (TREE_OPERAND (stmt, 0)) == IMAGPART_EXPR |
847 | /* Use a V_MAY_DEF if the RHS might throw, as the LHS won't be | |
848 | modified in that case. FIXME we should represent somehow | |
849 | that it is killed on the fallthrough path. */ | |
850 | || tree_could_throw_p (TREE_OPERAND (stmt, 1))) | |
1a24f92f | 851 | get_expr_operands (stmt, &TREE_OPERAND (stmt, 0), opf_is_def); |
a32b97a2 BB |
852 | else |
853 | get_expr_operands (stmt, &TREE_OPERAND (stmt, 0), | |
1a24f92f | 854 | opf_is_def | opf_kill_def); |
6de9cd9a DN |
855 | break; |
856 | ||
857 | case COND_EXPR: | |
1a24f92f | 858 | get_expr_operands (stmt, &COND_EXPR_COND (stmt), opf_none); |
6de9cd9a DN |
859 | break; |
860 | ||
861 | case SWITCH_EXPR: | |
1a24f92f | 862 | get_expr_operands (stmt, &SWITCH_COND (stmt), opf_none); |
6de9cd9a DN |
863 | break; |
864 | ||
865 | case ASM_EXPR: | |
1a24f92f | 866 | get_asm_expr_operands (stmt); |
6de9cd9a DN |
867 | break; |
868 | ||
869 | case RETURN_EXPR: | |
1a24f92f | 870 | get_expr_operands (stmt, &TREE_OPERAND (stmt, 0), opf_none); |
6de9cd9a DN |
871 | break; |
872 | ||
873 | case GOTO_EXPR: | |
1a24f92f | 874 | get_expr_operands (stmt, &GOTO_DESTINATION (stmt), opf_none); |
6de9cd9a DN |
875 | break; |
876 | ||
877 | case LABEL_EXPR: | |
1a24f92f | 878 | get_expr_operands (stmt, &LABEL_EXPR_LABEL (stmt), opf_none); |
6de9cd9a DN |
879 | break; |
880 | ||
881 | /* These nodes contain no variable references. */ | |
882 | case BIND_EXPR: | |
883 | case CASE_LABEL_EXPR: | |
884 | case TRY_CATCH_EXPR: | |
885 | case TRY_FINALLY_EXPR: | |
886 | case EH_FILTER_EXPR: | |
887 | case CATCH_EXPR: | |
888 | case RESX_EXPR: | |
889 | break; | |
890 | ||
891 | default: | |
892 | /* Notice that if get_expr_operands tries to use &STMT as the operand | |
893 | pointer (which may only happen for USE operands), we will abort in | |
77c9db77 RH |
894 | append_use. This default will handle statements like empty |
895 | statements, or CALL_EXPRs that may appear on the RHS of a statement | |
6de9cd9a | 896 | or as statements themselves. */ |
1a24f92f | 897 | get_expr_operands (stmt, &stmt, opf_none); |
6de9cd9a DN |
898 | break; |
899 | } | |
900 | ||
1a24f92f AM |
901 | finalize_ssa_stmt_operands (stmt, old_ops, new_ops); |
902 | stmt->common.ann = saved_ann; | |
903 | } | |
904 | ||
905 | ||
906 | /* Free any operands vectors in OPS. */ | |
907 | ||
908 | static void | |
909 | free_ssa_operands (stmt_operands_p ops) | |
910 | { | |
911 | if (ops->def_ops) | |
912 | free_defs (&(ops->def_ops)); | |
913 | if (ops->use_ops) | |
914 | free_uses (&(ops->use_ops)); | |
915 | if (ops->vuse_ops) | |
916 | free_vuses (&(ops->vuse_ops)); | |
917 | if (ops->v_may_def_ops) | |
918 | free_v_may_defs (&(ops->v_may_def_ops)); | |
919 | if (ops->v_must_def_ops) | |
920 | free_v_must_defs (&(ops->v_must_def_ops)); | |
921 | } | |
922 | ||
923 | ||
924 | /* Get the operands of statement STMT. Note that repeated calls to | |
925 | get_stmt_operands for the same statement will do nothing until the | |
926 | statement is marked modified by a call to modify_stmt(). */ | |
927 | ||
928 | void | |
929 | get_stmt_operands (tree stmt) | |
930 | { | |
931 | stmt_ann_t ann; | |
932 | stmt_operands_t old_operands; | |
933 | ||
1a24f92f AM |
934 | /* The optimizers cannot handle statements that are nothing but a |
935 | _DECL. This indicates a bug in the gimplifier. */ | |
1e128c5f | 936 | gcc_assert (!SSA_VAR_P (stmt)); |
1a24f92f AM |
937 | |
938 | /* Ignore error statements. */ | |
939 | if (TREE_CODE (stmt) == ERROR_MARK) | |
940 | return; | |
941 | ||
942 | ann = get_stmt_ann (stmt); | |
943 | ||
944 | /* If the statement has not been modified, the operands are still valid. */ | |
945 | if (!ann->modified) | |
946 | return; | |
947 | ||
948 | timevar_push (TV_TREE_OPS); | |
949 | ||
950 | old_operands = ann->operands; | |
951 | memset (&(ann->operands), 0, sizeof (stmt_operands_t)); | |
6de9cd9a | 952 | |
1a24f92f AM |
953 | build_ssa_operands (stmt, ann, &old_operands, &(ann->operands)); |
954 | free_ssa_operands (&old_operands); | |
6de9cd9a DN |
955 | |
956 | /* Clear the modified bit for STMT. Subsequent calls to | |
957 | get_stmt_operands for this statement will do nothing until the | |
958 | statement is marked modified by a call to modify_stmt(). */ | |
959 | ann->modified = 0; | |
960 | ||
961 | timevar_pop (TV_TREE_OPS); | |
962 | } | |
963 | ||
964 | ||
1a24f92f AM |
965 | /* Recursively scan the expression pointed by EXPR_P in statement referred to |
966 | by INFO. FLAGS is one of the OPF_* constants modifying how to interpret the | |
967 | operands found. */ | |
6de9cd9a DN |
968 | |
969 | static void | |
1a24f92f | 970 | get_expr_operands (tree stmt, tree *expr_p, int flags) |
6de9cd9a DN |
971 | { |
972 | enum tree_code code; | |
6615c446 | 973 | enum tree_code_class class; |
6de9cd9a DN |
974 | tree expr = *expr_p; |
975 | ||
976 | if (expr == NULL || expr == error_mark_node) | |
977 | return; | |
978 | ||
979 | code = TREE_CODE (expr); | |
980 | class = TREE_CODE_CLASS (code); | |
981 | ||
310de761 | 982 | switch (code) |
6de9cd9a | 983 | { |
310de761 RH |
984 | case ADDR_EXPR: |
985 | /* We could have the address of a component, array member, | |
986 | etc which has interesting variable references. */ | |
6de9cd9a | 987 | /* Taking the address of a variable does not represent a |
1a24f92f | 988 | reference to it, but the fact that the stmt takes its address will be |
6de9cd9a | 989 | of interest to some passes (e.g. alias resolution). */ |
1a24f92f | 990 | add_stmt_operand (expr_p, stmt, 0); |
6de9cd9a | 991 | |
d397dbcd DN |
992 | /* If the address is invariant, there may be no interesting variable |
993 | references inside. */ | |
994 | if (is_gimple_min_invariant (expr)) | |
6de9cd9a DN |
995 | return; |
996 | ||
997 | /* There should be no VUSEs created, since the referenced objects are | |
998 | not really accessed. The only operands that we should find here | |
999 | are ARRAY_REF indices which will always be real operands (GIMPLE | |
1000 | does not allow non-registers as array indices). */ | |
1001 | flags |= opf_no_vops; | |
1002 | ||
1a24f92f | 1003 | get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags); |
310de761 | 1004 | return; |
44de5aeb | 1005 | |
310de761 RH |
1006 | case SSA_NAME: |
1007 | case VAR_DECL: | |
1008 | case PARM_DECL: | |
1009 | case RESULT_DECL: | |
9ec9d82b | 1010 | case CONST_DECL: |
310de761 RH |
1011 | /* If we found a variable, add it to DEFS or USES depending |
1012 | on the operand flags. */ | |
1a24f92f | 1013 | add_stmt_operand (expr_p, stmt, flags); |
6de9cd9a | 1014 | return; |
6de9cd9a | 1015 | |
7ccf35ed DN |
1016 | case MISALIGNED_INDIRECT_REF: |
1017 | get_expr_operands (stmt, &TREE_OPERAND (expr, 1), flags); | |
1018 | /* fall through */ | |
1019 | ||
1020 | case ALIGN_INDIRECT_REF: | |
310de761 | 1021 | case INDIRECT_REF: |
1a24f92f | 1022 | get_indirect_ref_operands (stmt, expr, flags); |
6de9cd9a | 1023 | return; |
6de9cd9a | 1024 | |
310de761 RH |
1025 | case ARRAY_REF: |
1026 | case ARRAY_RANGE_REF: | |
1027 | /* Treat array references as references to the virtual variable | |
1028 | representing the array. The virtual variable for an ARRAY_REF | |
1029 | is the VAR_DECL for the array. */ | |
1030 | ||
6de9cd9a DN |
1031 | /* Add the virtual variable for the ARRAY_REF to VDEFS or VUSES |
1032 | according to the value of IS_DEF. Recurse if the LHS of the | |
1033 | ARRAY_REF node is not a regular variable. */ | |
1034 | if (SSA_VAR_P (TREE_OPERAND (expr, 0))) | |
1a24f92f | 1035 | add_stmt_operand (expr_p, stmt, flags); |
6de9cd9a | 1036 | else |
1a24f92f | 1037 | get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags); |
6de9cd9a | 1038 | |
1a24f92f AM |
1039 | get_expr_operands (stmt, &TREE_OPERAND (expr, 1), opf_none); |
1040 | get_expr_operands (stmt, &TREE_OPERAND (expr, 2), opf_none); | |
1041 | get_expr_operands (stmt, &TREE_OPERAND (expr, 3), opf_none); | |
6de9cd9a | 1042 | return; |
6de9cd9a | 1043 | |
310de761 RH |
1044 | case COMPONENT_REF: |
1045 | case REALPART_EXPR: | |
1046 | case IMAGPART_EXPR: | |
1047 | /* Similarly to arrays, references to compound variables (complex | |
1048 | types and structures/unions) are globbed. | |
6de9cd9a | 1049 | |
310de761 | 1050 | FIXME: This means that |
6de9cd9a DN |
1051 | |
1052 | a.x = 6; | |
1053 | a.y = 7; | |
1054 | foo (a.x, a.y); | |
1055 | ||
310de761 RH |
1056 | will not be constant propagated because the two partial |
1057 | definitions to 'a' will kill each other. Note that SRA may be | |
1058 | able to fix this problem if 'a' can be scalarized. */ | |
1059 | ||
6de9cd9a DN |
1060 | /* If the LHS of the compound reference is not a regular variable, |
1061 | recurse to keep looking for more operands in the subexpression. */ | |
1062 | if (SSA_VAR_P (TREE_OPERAND (expr, 0))) | |
1a24f92f | 1063 | add_stmt_operand (expr_p, stmt, flags); |
6de9cd9a | 1064 | else |
1a24f92f | 1065 | get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags); |
6de9cd9a | 1066 | |
44de5aeb | 1067 | if (code == COMPONENT_REF) |
1a24f92f | 1068 | get_expr_operands (stmt, &TREE_OPERAND (expr, 2), opf_none); |
6de9cd9a | 1069 | return; |
6de9cd9a | 1070 | |
d25cee4d | 1071 | case WITH_SIZE_EXPR: |
0e28378a | 1072 | /* WITH_SIZE_EXPR is a pass-through reference to its first argument, |
d25cee4d | 1073 | and an rvalue reference to its second argument. */ |
1a24f92f AM |
1074 | get_expr_operands (stmt, &TREE_OPERAND (expr, 1), opf_none); |
1075 | get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags); | |
d25cee4d RH |
1076 | return; |
1077 | ||
310de761 | 1078 | case CALL_EXPR: |
1a24f92f | 1079 | get_call_expr_operands (stmt, expr); |
6de9cd9a | 1080 | return; |
6de9cd9a | 1081 | |
40923b20 | 1082 | case COND_EXPR: |
ad9f20cb DP |
1083 | case VEC_COND_EXPR: |
1084 | get_expr_operands (stmt, &TREE_OPERAND (expr, 0), opf_none); | |
40923b20 DP |
1085 | get_expr_operands (stmt, &TREE_OPERAND (expr, 1), opf_none); |
1086 | get_expr_operands (stmt, &TREE_OPERAND (expr, 2), opf_none); | |
1087 | return; | |
1088 | ||
310de761 | 1089 | case MODIFY_EXPR: |
d25cee4d RH |
1090 | { |
1091 | int subflags; | |
1092 | tree op; | |
1093 | ||
1a24f92f | 1094 | get_expr_operands (stmt, &TREE_OPERAND (expr, 1), opf_none); |
d25cee4d RH |
1095 | |
1096 | op = TREE_OPERAND (expr, 0); | |
1097 | if (TREE_CODE (op) == WITH_SIZE_EXPR) | |
1098 | op = TREE_OPERAND (expr, 0); | |
a9315f66 RK |
1099 | if (TREE_CODE (op) == ARRAY_REF |
1100 | || TREE_CODE (op) == ARRAY_RANGE_REF | |
d25cee4d RH |
1101 | || TREE_CODE (op) == COMPONENT_REF |
1102 | || TREE_CODE (op) == REALPART_EXPR | |
1103 | || TREE_CODE (op) == IMAGPART_EXPR) | |
1104 | subflags = opf_is_def; | |
1105 | else | |
1106 | subflags = opf_is_def | opf_kill_def; | |
1107 | ||
1a24f92f | 1108 | get_expr_operands (stmt, &TREE_OPERAND (expr, 0), subflags); |
d25cee4d RH |
1109 | return; |
1110 | } | |
6de9cd9a | 1111 | |
7b48e1e0 RH |
1112 | case CONSTRUCTOR: |
1113 | { | |
1114 | /* General aggregate CONSTRUCTORs have been decomposed, but they | |
1115 | are still in use as the COMPLEX_EXPR equivalent for vectors. */ | |
1116 | ||
1117 | tree t; | |
1118 | for (t = TREE_OPERAND (expr, 0); t ; t = TREE_CHAIN (t)) | |
1a24f92f | 1119 | get_expr_operands (stmt, &TREE_VALUE (t), opf_none); |
7b48e1e0 RH |
1120 | |
1121 | return; | |
1122 | } | |
1123 | ||
310de761 RH |
1124 | case TRUTH_NOT_EXPR: |
1125 | case BIT_FIELD_REF: | |
4626c433 | 1126 | case VIEW_CONVERT_EXPR: |
310de761 | 1127 | do_unary: |
1a24f92f | 1128 | get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags); |
6de9cd9a | 1129 | return; |
6de9cd9a | 1130 | |
310de761 RH |
1131 | case TRUTH_AND_EXPR: |
1132 | case TRUTH_OR_EXPR: | |
1133 | case TRUTH_XOR_EXPR: | |
1134 | case COMPOUND_EXPR: | |
1135 | case OBJ_TYPE_REF: | |
1136 | do_binary: | |
1137 | { | |
1138 | tree op0 = TREE_OPERAND (expr, 0); | |
1139 | tree op1 = TREE_OPERAND (expr, 1); | |
fd660b1b | 1140 | |
310de761 RH |
1141 | /* If it would be profitable to swap the operands, then do so to |
1142 | canonicalize the statement, enabling better optimization. | |
fd660b1b | 1143 | |
310de761 RH |
1144 | By placing canonicalization of such expressions here we |
1145 | transparently keep statements in canonical form, even | |
1146 | when the statement is modified. */ | |
1147 | if (tree_swap_operands_p (op0, op1, false)) | |
1148 | { | |
1149 | /* For relationals we need to swap the operands | |
1150 | and change the code. */ | |
1151 | if (code == LT_EXPR | |
1152 | || code == GT_EXPR | |
1153 | || code == LE_EXPR | |
1154 | || code == GE_EXPR) | |
1155 | { | |
1156 | TREE_SET_CODE (expr, swap_tree_comparison (code)); | |
1157 | TREE_OPERAND (expr, 0) = op1; | |
1158 | TREE_OPERAND (expr, 1) = op0; | |
1159 | } | |
fd660b1b | 1160 | |
310de761 RH |
1161 | /* For a commutative operator we can just swap the operands. */ |
1162 | else if (commutative_tree_code (code)) | |
1163 | { | |
1164 | TREE_OPERAND (expr, 0) = op1; | |
1165 | TREE_OPERAND (expr, 1) = op0; | |
1166 | } | |
1167 | } | |
fd660b1b | 1168 | |
1a24f92f AM |
1169 | get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags); |
1170 | get_expr_operands (stmt, &TREE_OPERAND (expr, 1), flags); | |
310de761 RH |
1171 | return; |
1172 | } | |
1173 | ||
7ccf35ed DN |
1174 | case REALIGN_LOAD_EXPR: |
1175 | { | |
1176 | get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags); | |
1177 | get_expr_operands (stmt, &TREE_OPERAND (expr, 1), flags); | |
1178 | get_expr_operands (stmt, &TREE_OPERAND (expr, 2), flags); | |
1179 | return; | |
1180 | } | |
1181 | ||
310de761 RH |
1182 | case BLOCK: |
1183 | case FUNCTION_DECL: | |
1184 | case EXC_PTR_EXPR: | |
1185 | case FILTER_EXPR: | |
1186 | case LABEL_DECL: | |
310de761 | 1187 | /* Expressions that make no memory references. */ |
6de9cd9a | 1188 | return; |
310de761 RH |
1189 | |
1190 | default: | |
6615c446 | 1191 | if (class == tcc_unary) |
310de761 | 1192 | goto do_unary; |
6615c446 | 1193 | if (class == tcc_binary || class == tcc_comparison) |
310de761 | 1194 | goto do_binary; |
6615c446 | 1195 | if (class == tcc_constant || class == tcc_type) |
310de761 | 1196 | return; |
6de9cd9a DN |
1197 | } |
1198 | ||
1199 | /* If we get here, something has gone wrong. */ | |
1e128c5f | 1200 | #ifdef ENABLE_CHECKING |
6de9cd9a DN |
1201 | fprintf (stderr, "unhandled expression in get_expr_operands():\n"); |
1202 | debug_tree (expr); | |
1203 | fputs ("\n", stderr); | |
1e128c5f GB |
1204 | internal_error ("internal error"); |
1205 | #endif | |
1206 | gcc_unreachable (); | |
6de9cd9a DN |
1207 | } |
1208 | ||
7c35745c | 1209 | |
6cb38cd4 | 1210 | /* Scan operands in the ASM_EXPR stmt referred to in INFO. */ |
a6d02559 DN |
1211 | |
1212 | static void | |
1a24f92f | 1213 | get_asm_expr_operands (tree stmt) |
a6d02559 | 1214 | { |
1a24f92f | 1215 | stmt_ann_t s_ann = stmt_ann (stmt); |
a6d02559 DN |
1216 | int noutputs = list_length (ASM_OUTPUTS (stmt)); |
1217 | const char **oconstraints | |
1218 | = (const char **) alloca ((noutputs) * sizeof (const char *)); | |
1219 | int i; | |
1220 | tree link; | |
1221 | const char *constraint; | |
1222 | bool allows_mem, allows_reg, is_inout; | |
a6d02559 DN |
1223 | |
1224 | for (i=0, link = ASM_OUTPUTS (stmt); link; ++i, link = TREE_CHAIN (link)) | |
1225 | { | |
1226 | oconstraints[i] = constraint | |
1227 | = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link))); | |
1228 | parse_output_constraint (&constraint, i, 0, 0, | |
1229 | &allows_mem, &allows_reg, &is_inout); | |
1230 | ||
a6d02559 | 1231 | /* This should have been split in gimplify_asm_expr. */ |
1e128c5f | 1232 | gcc_assert (!allows_reg || !is_inout); |
a6d02559 DN |
1233 | |
1234 | /* Memory operands are addressable. Note that STMT needs the | |
1235 | address of this operand. */ | |
1236 | if (!allows_reg && allows_mem) | |
1237 | { | |
1238 | tree t = get_base_address (TREE_VALUE (link)); | |
1239 | if (t && DECL_P (t)) | |
1240 | note_addressable (t, s_ann); | |
1241 | } | |
1242 | ||
1a24f92f | 1243 | get_expr_operands (stmt, &TREE_VALUE (link), opf_is_def); |
a6d02559 DN |
1244 | } |
1245 | ||
1246 | for (link = ASM_INPUTS (stmt); link; link = TREE_CHAIN (link)) | |
1247 | { | |
1248 | constraint | |
1249 | = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link))); | |
1250 | parse_input_constraint (&constraint, 0, 0, noutputs, 0, | |
1251 | oconstraints, &allows_mem, &allows_reg); | |
1252 | ||
1253 | /* Memory operands are addressable. Note that STMT needs the | |
1254 | address of this operand. */ | |
1255 | if (!allows_reg && allows_mem) | |
1256 | { | |
1257 | tree t = get_base_address (TREE_VALUE (link)); | |
1258 | if (t && DECL_P (t)) | |
1259 | note_addressable (t, s_ann); | |
1260 | } | |
1261 | ||
1a24f92f | 1262 | get_expr_operands (stmt, &TREE_VALUE (link), 0); |
a6d02559 DN |
1263 | } |
1264 | ||
7c35745c | 1265 | |
a6d02559 | 1266 | /* Clobber memory for asm ("" : : : "memory"); */ |
7c35745c DN |
1267 | for (link = ASM_CLOBBERS (stmt); link; link = TREE_CHAIN (link)) |
1268 | if (strcmp (TREE_STRING_POINTER (TREE_VALUE (link)), "memory") == 0) | |
1269 | { | |
1270 | size_t i; | |
87c476a2 | 1271 | bitmap_iterator bi; |
7c35745c | 1272 | |
7c35745c DN |
1273 | /* Clobber all call-clobbered variables (or .GLOBAL_VAR if we |
1274 | decided to group them). */ | |
1275 | if (global_var) | |
1a24f92f | 1276 | add_stmt_operand (&global_var, stmt, opf_is_def); |
7c35745c | 1277 | else |
87c476a2 | 1278 | EXECUTE_IF_SET_IN_BITMAP (call_clobbered_vars, 0, i, bi) |
a6d02559 | 1279 | { |
7c35745c | 1280 | tree var = referenced_var (i); |
1a24f92f | 1281 | add_stmt_operand (&var, stmt, opf_is_def); |
87c476a2 | 1282 | } |
a6d02559 | 1283 | |
7c35745c | 1284 | /* Now clobber all addressables. */ |
87c476a2 | 1285 | EXECUTE_IF_SET_IN_BITMAP (addressable_vars, 0, i, bi) |
7c35745c DN |
1286 | { |
1287 | tree var = referenced_var (i); | |
1a24f92f | 1288 | add_stmt_operand (&var, stmt, opf_is_def); |
87c476a2 | 1289 | } |
a6d02559 | 1290 | |
7c35745c DN |
1291 | break; |
1292 | } | |
a6d02559 DN |
1293 | } |
1294 | ||
7ccf35ed DN |
1295 | /* A subroutine of get_expr_operands to handle INDIRECT_REF, |
1296 | ALIGN_INDIRECT_REF and MISALIGNED_INDIRECT_REF. */ | |
310de761 RH |
1297 | |
1298 | static void | |
1a24f92f | 1299 | get_indirect_ref_operands (tree stmt, tree expr, int flags) |
310de761 RH |
1300 | { |
1301 | tree *pptr = &TREE_OPERAND (expr, 0); | |
1302 | tree ptr = *pptr; | |
1a24f92f AM |
1303 | stmt_ann_t ann = stmt_ann (stmt); |
1304 | ||
50dc9a88 DN |
1305 | /* Stores into INDIRECT_REF operands are never killing definitions. */ |
1306 | flags &= ~opf_kill_def; | |
310de761 | 1307 | |
8b11a64c ZD |
1308 | if (REF_ORIGINAL (expr)) |
1309 | { | |
1310 | enum tree_code ocode = TREE_CODE (REF_ORIGINAL (expr)); | |
1311 | ||
1312 | /* If we originally accessed part of a structure, we do it still. */ | |
1313 | if (ocode == ARRAY_REF | |
1314 | || ocode == COMPONENT_REF | |
1315 | || ocode == REALPART_EXPR | |
1316 | || ocode == IMAGPART_EXPR) | |
1317 | flags &= ~opf_kill_def; | |
1318 | } | |
1319 | ||
310de761 RH |
1320 | if (SSA_VAR_P (ptr)) |
1321 | { | |
c1b763fa DN |
1322 | struct ptr_info_def *pi = NULL; |
1323 | ||
1324 | /* If PTR has flow-sensitive points-to information, use it. */ | |
1325 | if (TREE_CODE (ptr) == SSA_NAME | |
1326 | && (pi = SSA_NAME_PTR_INFO (ptr)) != NULL | |
1327 | && pi->name_mem_tag) | |
310de761 | 1328 | { |
c1b763fa | 1329 | /* PTR has its own memory tag. Use it. */ |
1a24f92f | 1330 | add_stmt_operand (&pi->name_mem_tag, stmt, flags); |
310de761 RH |
1331 | } |
1332 | else | |
1333 | { | |
c1b763fa DN |
1334 | /* If PTR is not an SSA_NAME or it doesn't have a name |
1335 | tag, use its type memory tag. */ | |
1336 | var_ann_t ann; | |
1337 | ||
1338 | /* If we are emitting debugging dumps, display a warning if | |
1339 | PTR is an SSA_NAME with no flow-sensitive alias | |
1340 | information. That means that we may need to compute | |
1341 | aliasing again. */ | |
1342 | if (dump_file | |
1343 | && TREE_CODE (ptr) == SSA_NAME | |
1344 | && pi == NULL) | |
310de761 | 1345 | { |
c1b763fa DN |
1346 | fprintf (dump_file, |
1347 | "NOTE: no flow-sensitive alias info for "); | |
1348 | print_generic_expr (dump_file, ptr, dump_flags); | |
1349 | fprintf (dump_file, " in "); | |
1350 | print_generic_stmt (dump_file, stmt, dump_flags); | |
310de761 | 1351 | } |
310de761 | 1352 | |
c1b763fa DN |
1353 | if (TREE_CODE (ptr) == SSA_NAME) |
1354 | ptr = SSA_NAME_VAR (ptr); | |
1355 | ann = var_ann (ptr); | |
1356 | if (ann->type_mem_tag) | |
1a24f92f | 1357 | add_stmt_operand (&ann->type_mem_tag, stmt, flags); |
310de761 RH |
1358 | } |
1359 | } | |
1360 | ||
1361 | /* If a constant is used as a pointer, we can't generate a real | |
1362 | operand for it but we mark the statement volatile to prevent | |
1363 | optimizations from messing things up. */ | |
1364 | else if (TREE_CODE (ptr) == INTEGER_CST) | |
1365 | { | |
1a24f92f AM |
1366 | if (ann) |
1367 | ann->has_volatile_ops = true; | |
310de761 RH |
1368 | return; |
1369 | } | |
1370 | ||
1371 | /* Everything else *should* have been folded elsewhere, but users | |
1372 | are smarter than we in finding ways to write invalid code. We | |
1373 | cannot just abort here. If we were absolutely certain that we | |
1374 | do handle all valid cases, then we could just do nothing here. | |
1375 | That seems optimistic, so attempt to do something logical... */ | |
1376 | else if ((TREE_CODE (ptr) == PLUS_EXPR || TREE_CODE (ptr) == MINUS_EXPR) | |
1377 | && TREE_CODE (TREE_OPERAND (ptr, 0)) == ADDR_EXPR | |
1378 | && TREE_CODE (TREE_OPERAND (ptr, 1)) == INTEGER_CST) | |
1379 | { | |
1380 | /* Make sure we know the object is addressable. */ | |
1381 | pptr = &TREE_OPERAND (ptr, 0); | |
1a24f92f | 1382 | add_stmt_operand (pptr, stmt, 0); |
310de761 RH |
1383 | |
1384 | /* Mark the object itself with a VUSE. */ | |
1385 | pptr = &TREE_OPERAND (*pptr, 0); | |
1a24f92f | 1386 | get_expr_operands (stmt, pptr, flags); |
310de761 RH |
1387 | return; |
1388 | } | |
1389 | ||
1390 | /* Ok, this isn't even is_gimple_min_invariant. Something's broke. */ | |
1391 | else | |
1e128c5f | 1392 | gcc_unreachable (); |
310de761 RH |
1393 | |
1394 | /* Add a USE operand for the base pointer. */ | |
1a24f92f | 1395 | get_expr_operands (stmt, pptr, opf_none); |
310de761 RH |
1396 | } |
1397 | ||
1398 | /* A subroutine of get_expr_operands to handle CALL_EXPR. */ | |
1399 | ||
1400 | static void | |
1a24f92f | 1401 | get_call_expr_operands (tree stmt, tree expr) |
310de761 RH |
1402 | { |
1403 | tree op; | |
1404 | int call_flags = call_expr_flags (expr); | |
1405 | ||
1406 | /* Find uses in the called function. */ | |
1a24f92f | 1407 | get_expr_operands (stmt, &TREE_OPERAND (expr, 0), opf_none); |
310de761 RH |
1408 | |
1409 | for (op = TREE_OPERAND (expr, 1); op; op = TREE_CHAIN (op)) | |
1a24f92f | 1410 | get_expr_operands (stmt, &TREE_VALUE (op), opf_none); |
310de761 | 1411 | |
1a24f92f | 1412 | get_expr_operands (stmt, &TREE_OPERAND (expr, 2), opf_none); |
310de761 RH |
1413 | |
1414 | if (bitmap_first_set_bit (call_clobbered_vars) >= 0) | |
1415 | { | |
1416 | /* A 'pure' or a 'const' functions never call clobber anything. | |
1417 | A 'noreturn' function might, but since we don't return anyway | |
1418 | there is no point in recording that. */ | |
c597ef4e DN |
1419 | if (TREE_SIDE_EFFECTS (expr) |
1420 | && !(call_flags & (ECF_PURE | ECF_CONST | ECF_NORETURN))) | |
85c33455 | 1421 | add_call_clobber_ops (stmt); |
c0e1b12f | 1422 | else if (!(call_flags & ECF_CONST)) |
85c33455 | 1423 | add_call_read_ops (stmt); |
310de761 | 1424 | } |
310de761 RH |
1425 | } |
1426 | ||
6de9cd9a | 1427 | |
1a24f92f | 1428 | /* Add *VAR_P to the appropriate operand array for INFO. FLAGS is as in |
6de9cd9a DN |
1429 | get_expr_operands. If *VAR_P is a GIMPLE register, it will be added to |
1430 | the statement's real operands, otherwise it is added to virtual | |
1a24f92f | 1431 | operands. */ |
6de9cd9a DN |
1432 | |
1433 | static void | |
1a24f92f | 1434 | add_stmt_operand (tree *var_p, tree stmt, int flags) |
6de9cd9a DN |
1435 | { |
1436 | bool is_real_op; | |
1437 | tree var, sym; | |
1a24f92f | 1438 | stmt_ann_t s_ann = stmt_ann (stmt); |
6de9cd9a DN |
1439 | var_ann_t v_ann; |
1440 | ||
1441 | var = *var_p; | |
1442 | STRIP_NOPS (var); | |
1443 | ||
6de9cd9a DN |
1444 | /* If the operand is an ADDR_EXPR, add its operand to the list of |
1445 | variables that have had their address taken in this statement. */ | |
1446 | if (TREE_CODE (var) == ADDR_EXPR) | |
1447 | { | |
1448 | note_addressable (TREE_OPERAND (var, 0), s_ann); | |
1449 | return; | |
1450 | } | |
1451 | ||
1452 | /* If the original variable is not a scalar, it will be added to the list | |
1453 | of virtual operands. In that case, use its base symbol as the virtual | |
1454 | variable representing it. */ | |
1455 | is_real_op = is_gimple_reg (var); | |
1456 | if (!is_real_op && !DECL_P (var)) | |
1457 | var = get_virtual_var (var); | |
1458 | ||
1459 | /* If VAR is not a variable that we care to optimize, do nothing. */ | |
1460 | if (var == NULL_TREE || !SSA_VAR_P (var)) | |
1461 | return; | |
1462 | ||
1463 | sym = (TREE_CODE (var) == SSA_NAME ? SSA_NAME_VAR (var) : var); | |
1464 | v_ann = var_ann (sym); | |
1465 | ||
6de9cd9a DN |
1466 | /* Don't expose volatile variables to the optimizers. */ |
1467 | if (TREE_THIS_VOLATILE (sym)) | |
1468 | { | |
1a24f92f AM |
1469 | if (s_ann) |
1470 | s_ann->has_volatile_ops = true; | |
6de9cd9a DN |
1471 | return; |
1472 | } | |
1473 | ||
1474 | if (is_real_op) | |
1475 | { | |
1476 | /* The variable is a GIMPLE register. Add it to real operands. */ | |
1477 | if (flags & opf_is_def) | |
1a24f92f | 1478 | append_def (var_p); |
6de9cd9a | 1479 | else |
1a24f92f | 1480 | append_use (var_p); |
6de9cd9a DN |
1481 | } |
1482 | else | |
1483 | { | |
1484 | varray_type aliases; | |
1485 | ||
1486 | /* The variable is not a GIMPLE register. Add it (or its aliases) to | |
1487 | virtual operands, unless the caller has specifically requested | |
1488 | not to add virtual operands (used when adding operands inside an | |
1489 | ADDR_EXPR expression). */ | |
1490 | if (flags & opf_no_vops) | |
1491 | return; | |
1492 | ||
1493 | aliases = v_ann->may_aliases; | |
1494 | ||
6de9cd9a DN |
1495 | if (aliases == NULL) |
1496 | { | |
1497 | /* The variable is not aliased or it is an alias tag. */ | |
1498 | if (flags & opf_is_def) | |
1499 | { | |
ed7f7d85 | 1500 | if (flags & opf_kill_def) |
50dc9a88 | 1501 | { |
50dc9a88 DN |
1502 | /* Only regular variables may get a V_MUST_DEF |
1503 | operand. */ | |
1e128c5f | 1504 | gcc_assert (v_ann->mem_tag_kind == NOT_A_TAG); |
50dc9a88 DN |
1505 | /* V_MUST_DEF for non-aliased, non-GIMPLE register |
1506 | variable definitions. */ | |
1507 | append_v_must_def (var); | |
1508 | } | |
a32b97a2 | 1509 | else |
50dc9a88 DN |
1510 | { |
1511 | /* Add a V_MAY_DEF for call-clobbered variables and | |
1512 | memory tags. */ | |
1513 | append_v_may_def (var); | |
1514 | } | |
6de9cd9a DN |
1515 | } |
1516 | else | |
1517 | { | |
1a24f92f AM |
1518 | append_vuse (var); |
1519 | if (s_ann && v_ann->is_alias_tag) | |
6de9cd9a DN |
1520 | s_ann->makes_aliased_loads = 1; |
1521 | } | |
1522 | } | |
1523 | else | |
1524 | { | |
1525 | size_t i; | |
1526 | ||
1527 | /* The variable is aliased. Add its aliases to the virtual | |
1528 | operands. */ | |
1e128c5f | 1529 | gcc_assert (VARRAY_ACTIVE_SIZE (aliases) != 0); |
6de9cd9a DN |
1530 | |
1531 | if (flags & opf_is_def) | |
1532 | { | |
1533 | /* If the variable is also an alias tag, add a virtual | |
1534 | operand for it, otherwise we will miss representing | |
1535 | references to the members of the variable's alias set. | |
1536 | This fixes the bug in gcc.c-torture/execute/20020503-1.c. */ | |
1537 | if (v_ann->is_alias_tag) | |
1a24f92f | 1538 | append_v_may_def (var); |
6de9cd9a DN |
1539 | |
1540 | for (i = 0; i < VARRAY_ACTIVE_SIZE (aliases); i++) | |
1a24f92f | 1541 | append_v_may_def (VARRAY_TREE (aliases, i)); |
6de9cd9a | 1542 | |
1a24f92f AM |
1543 | if (s_ann) |
1544 | s_ann->makes_aliased_stores = 1; | |
6de9cd9a DN |
1545 | } |
1546 | else | |
1547 | { | |
50dc9a88 DN |
1548 | /* Similarly, append a virtual uses for VAR itself, when |
1549 | it is an alias tag. */ | |
6de9cd9a | 1550 | if (v_ann->is_alias_tag) |
1a24f92f | 1551 | append_vuse (var); |
6de9cd9a DN |
1552 | |
1553 | for (i = 0; i < VARRAY_ACTIVE_SIZE (aliases); i++) | |
1a24f92f | 1554 | append_vuse (VARRAY_TREE (aliases, i)); |
6de9cd9a | 1555 | |
1a24f92f AM |
1556 | if (s_ann) |
1557 | s_ann->makes_aliased_loads = 1; | |
6de9cd9a DN |
1558 | } |
1559 | } | |
1560 | } | |
1561 | } | |
1562 | ||
1a24f92f | 1563 | |
6de9cd9a DN |
1564 | /* Record that VAR had its address taken in the statement with annotations |
1565 | S_ANN. */ | |
1566 | ||
1567 | static void | |
1568 | note_addressable (tree var, stmt_ann_t s_ann) | |
1569 | { | |
1a24f92f AM |
1570 | if (!s_ann) |
1571 | return; | |
1572 | ||
6de9cd9a DN |
1573 | var = get_base_address (var); |
1574 | if (var && SSA_VAR_P (var)) | |
1575 | { | |
1576 | if (s_ann->addresses_taken == NULL) | |
1577 | s_ann->addresses_taken = BITMAP_GGC_ALLOC (); | |
1578 | bitmap_set_bit (s_ann->addresses_taken, var_ann (var)->uid); | |
1579 | } | |
1580 | } | |
1581 | ||
1582 | ||
1583 | /* Add clobbering definitions for .GLOBAL_VAR or for each of the call | |
1584 | clobbered variables in the function. */ | |
1585 | ||
1586 | static void | |
85c33455 | 1587 | add_call_clobber_ops (tree stmt) |
6de9cd9a DN |
1588 | { |
1589 | /* Functions that are not const, pure or never return may clobber | |
1590 | call-clobbered variables. */ | |
1a24f92f AM |
1591 | if (stmt_ann (stmt)) |
1592 | stmt_ann (stmt)->makes_clobbering_call = true; | |
6de9cd9a | 1593 | |
a32b97a2 BB |
1594 | /* If we had created .GLOBAL_VAR earlier, use it. Otherwise, add |
1595 | a V_MAY_DEF operand for every call clobbered variable. See | |
1596 | compute_may_aliases for the heuristic used to decide whether | |
1597 | to create .GLOBAL_VAR or not. */ | |
6de9cd9a | 1598 | if (global_var) |
1a24f92f | 1599 | add_stmt_operand (&global_var, stmt, opf_is_def); |
6de9cd9a DN |
1600 | else |
1601 | { | |
1602 | size_t i; | |
87c476a2 | 1603 | bitmap_iterator bi; |
6de9cd9a | 1604 | |
87c476a2 | 1605 | EXECUTE_IF_SET_IN_BITMAP (call_clobbered_vars, 0, i, bi) |
6de9cd9a DN |
1606 | { |
1607 | tree var = referenced_var (i); | |
85c33455 KZ |
1608 | if (TREE_READONLY (var) |
1609 | && (TREE_STATIC (var) || DECL_EXTERNAL (var))) | |
1610 | add_stmt_operand (&var, stmt, opf_none); | |
6de9cd9a | 1611 | else |
85c33455 | 1612 | add_stmt_operand (&var, stmt, opf_is_def); |
87c476a2 | 1613 | } |
6de9cd9a DN |
1614 | } |
1615 | } | |
1616 | ||
1617 | ||
1618 | /* Add VUSE operands for .GLOBAL_VAR or all call clobbered variables in the | |
1619 | function. */ | |
1620 | ||
1621 | static void | |
85c33455 | 1622 | add_call_read_ops (tree stmt) |
6de9cd9a | 1623 | { |
87c476a2 ZD |
1624 | bitmap_iterator bi; |
1625 | ||
6de9cd9a DN |
1626 | /* Otherwise, if the function is not pure, it may reference memory. Add |
1627 | a VUSE for .GLOBAL_VAR if it has been created. Otherwise, add a VUSE | |
1628 | for each call-clobbered variable. See add_referenced_var for the | |
1629 | heuristic used to decide whether to create .GLOBAL_VAR. */ | |
1630 | if (global_var) | |
1a24f92f | 1631 | add_stmt_operand (&global_var, stmt, opf_none); |
6de9cd9a DN |
1632 | else |
1633 | { | |
1634 | size_t i; | |
85c33455 | 1635 | |
87c476a2 | 1636 | EXECUTE_IF_SET_IN_BITMAP (call_clobbered_vars, 0, i, bi) |
6de9cd9a DN |
1637 | { |
1638 | tree var = referenced_var (i); | |
1a24f92f | 1639 | add_stmt_operand (&var, stmt, opf_none); |
87c476a2 | 1640 | } |
6de9cd9a DN |
1641 | } |
1642 | } | |
1643 | ||
5f240ec4 ZD |
1644 | /* Copies virtual operands from SRC to DST. */ |
1645 | ||
1646 | void | |
1647 | copy_virtual_operands (tree dst, tree src) | |
1648 | { | |
1a24f92f | 1649 | unsigned i; |
5f240ec4 ZD |
1650 | vuse_optype vuses = STMT_VUSE_OPS (src); |
1651 | v_may_def_optype v_may_defs = STMT_V_MAY_DEF_OPS (src); | |
1652 | v_must_def_optype v_must_defs = STMT_V_MUST_DEF_OPS (src); | |
1a24f92f AM |
1653 | vuse_optype *vuses_new = &stmt_ann (dst)->operands.vuse_ops; |
1654 | v_may_def_optype *v_may_defs_new = &stmt_ann (dst)->operands.v_may_def_ops; | |
1655 | v_must_def_optype *v_must_defs_new = &stmt_ann (dst)->operands.v_must_def_ops; | |
5f240ec4 ZD |
1656 | |
1657 | if (vuses) | |
1658 | { | |
1659 | *vuses_new = allocate_vuse_optype (NUM_VUSES (vuses)); | |
1660 | for (i = 0; i < NUM_VUSES (vuses); i++) | |
1661 | SET_VUSE_OP (*vuses_new, i, VUSE_OP (vuses, i)); | |
1662 | } | |
1663 | ||
1664 | if (v_may_defs) | |
1665 | { | |
1666 | *v_may_defs_new = allocate_v_may_def_optype (NUM_V_MAY_DEFS (v_may_defs)); | |
1667 | for (i = 0; i < NUM_V_MAY_DEFS (v_may_defs); i++) | |
1668 | { | |
1669 | SET_V_MAY_DEF_OP (*v_may_defs_new, i, V_MAY_DEF_OP (v_may_defs, i)); | |
1670 | SET_V_MAY_DEF_RESULT (*v_may_defs_new, i, | |
1671 | V_MAY_DEF_RESULT (v_may_defs, i)); | |
1672 | } | |
1673 | } | |
1674 | ||
1675 | if (v_must_defs) | |
1676 | { | |
1677 | *v_must_defs_new = allocate_v_must_def_optype (NUM_V_MUST_DEFS (v_must_defs)); | |
1678 | for (i = 0; i < NUM_V_MUST_DEFS (v_must_defs); i++) | |
52328bf6 DB |
1679 | { |
1680 | SET_V_MUST_DEF_RESULT (*v_must_defs_new, i, V_MUST_DEF_RESULT (v_must_defs, i)); | |
1681 | SET_V_MUST_DEF_KILL (*v_must_defs_new, i, V_MUST_DEF_KILL (v_must_defs, i)); | |
1682 | } | |
5f240ec4 ZD |
1683 | } |
1684 | } | |
1685 | ||
1a24f92f AM |
1686 | |
1687 | /* Specifically for use in DOM's expression analysis. Given a store, we | |
2a7e31df | 1688 | create an artificial stmt which looks like a load from the store, this can |
1a24f92f | 1689 | be used to eliminate redundant loads. OLD_OPS are the operands from the |
2a7e31df | 1690 | store stmt, and NEW_STMT is the new load which represents a load of the |
1a24f92f AM |
1691 | values stored. */ |
1692 | ||
1693 | void | |
1694 | create_ssa_artficial_load_stmt (stmt_operands_p old_ops, tree new_stmt) | |
1695 | { | |
1696 | stmt_ann_t ann; | |
1697 | tree op; | |
1698 | stmt_operands_t tmp; | |
1699 | unsigned j; | |
1700 | ||
1701 | memset (&tmp, 0, sizeof (stmt_operands_t)); | |
1702 | ann = get_stmt_ann (new_stmt); | |
1703 | ||
1704 | /* Free operands just in case is was an existing stmt. */ | |
1705 | free_ssa_operands (&(ann->operands)); | |
1706 | ||
1707 | build_ssa_operands (new_stmt, NULL, &tmp, &(ann->operands)); | |
1708 | free_vuses (&(ann->operands.vuse_ops)); | |
1709 | free_v_may_defs (&(ann->operands.v_may_def_ops)); | |
1710 | free_v_must_defs (&(ann->operands.v_must_def_ops)); | |
52328bf6 | 1711 | |
1a24f92f AM |
1712 | /* For each VDEF on the original statement, we want to create a |
1713 | VUSE of the V_MAY_DEF result or V_MUST_DEF op on the new | |
1714 | statement. */ | |
1715 | for (j = 0; j < NUM_V_MAY_DEFS (old_ops->v_may_def_ops); j++) | |
1716 | { | |
1717 | op = V_MAY_DEF_RESULT (old_ops->v_may_def_ops, j); | |
1718 | append_vuse (op); | |
1719 | } | |
1720 | ||
1721 | for (j = 0; j < NUM_V_MUST_DEFS (old_ops->v_must_def_ops); j++) | |
1722 | { | |
52328bf6 | 1723 | op = V_MUST_DEF_RESULT (old_ops->v_must_def_ops, j); |
1a24f92f AM |
1724 | append_vuse (op); |
1725 | } | |
1726 | ||
1727 | /* Now set the vuses for this new stmt. */ | |
1728 | ann->operands.vuse_ops = finalize_ssa_vuses (&(tmp.vuse_ops)); | |
1729 | } | |
1730 | ||
6de9cd9a | 1731 | #include "gt-tree-ssa-operands.h" |