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8b57bfeb | 1 | /* String length optimization |
818ab71a | 2 | Copyright (C) 2011-2016 Free Software Foundation, Inc. |
8b57bfeb JJ |
3 | Contributed by Jakub Jelinek <jakub@redhat.com> |
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" | |
c7131fb2 | 24 | #include "backend.h" |
957060b5 | 25 | #include "rtl.h" |
4d648807 | 26 | #include "tree.h" |
c7131fb2 | 27 | #include "gimple.h" |
957060b5 AM |
28 | #include "alloc-pool.h" |
29 | #include "tree-pass.h" | |
c7131fb2 | 30 | #include "ssa.h" |
957060b5 AM |
31 | #include "cgraph.h" |
32 | #include "gimple-pretty-print.h" | |
40e23961 | 33 | #include "fold-const.h" |
d8a2d370 | 34 | #include "stor-layout.h" |
2fb9a547 AM |
35 | #include "gimple-fold.h" |
36 | #include "tree-eh.h" | |
45b0be94 | 37 | #include "gimplify.h" |
5be5c238 | 38 | #include "gimple-iterator.h" |
18f429e2 | 39 | #include "gimplify-me.h" |
d8a2d370 | 40 | #include "expr.h" |
442b4905 | 41 | #include "tree-dfa.h" |
8b57bfeb | 42 | #include "domwalk.h" |
8b57bfeb | 43 | #include "tree-ssa-propagate.h" |
8b57bfeb | 44 | #include "params.h" |
f5fc4a04 | 45 | #include "ipa-chkp.h" |
910ee068 | 46 | #include "tree-hash-traits.h" |
36b85e43 | 47 | #include "builtins.h" |
8b57bfeb JJ |
48 | |
49 | /* A vector indexed by SSA_NAME_VERSION. 0 means unknown, positive value | |
50 | is an index into strinfo vector, negative value stands for | |
51 | string length of a string literal (~strlen). */ | |
9771b263 | 52 | static vec<int> ssa_ver_to_stridx; |
8b57bfeb JJ |
53 | |
54 | /* Number of currently active string indexes plus one. */ | |
55 | static int max_stridx; | |
56 | ||
57 | /* String information record. */ | |
526ceb68 | 58 | struct strinfo |
8b57bfeb JJ |
59 | { |
60 | /* String length of this string. */ | |
61 | tree length; | |
62 | /* Any of the corresponding pointers for querying alias oracle. */ | |
63 | tree ptr; | |
64 | /* Statement for delayed length computation. */ | |
355fe088 | 65 | gimple *stmt; |
8b57bfeb JJ |
66 | /* Pointer to '\0' if known, if NULL, it can be computed as |
67 | ptr + length. */ | |
68 | tree endptr; | |
69 | /* Reference count. Any changes to strinfo entry possibly shared | |
70 | with dominating basic blocks need unshare_strinfo first, except | |
71 | for dont_invalidate which affects only the immediately next | |
72 | maybe_invalidate. */ | |
73 | int refcount; | |
74 | /* Copy of index. get_strinfo (si->idx) should return si; */ | |
75 | int idx; | |
76 | /* These 3 fields are for chaining related string pointers together. | |
77 | E.g. for | |
78 | bl = strlen (b); dl = strlen (d); strcpy (a, b); c = a + bl; | |
79 | strcpy (c, d); e = c + dl; | |
80 | strinfo(a) -> strinfo(c) -> strinfo(e) | |
81 | All have ->first field equal to strinfo(a)->idx and are doubly | |
82 | chained through prev/next fields. The later strinfos are required | |
83 | to point into the same string with zero or more bytes after | |
84 | the previous pointer and all bytes in between the two pointers | |
85 | must be non-zero. Functions like strcpy or memcpy are supposed | |
86 | to adjust all previous strinfo lengths, but not following strinfo | |
87 | lengths (those are uncertain, usually invalidated during | |
88 | maybe_invalidate, except when the alias oracle knows better). | |
89 | Functions like strcat on the other side adjust the whole | |
90 | related strinfo chain. | |
91 | They are updated lazily, so to use the chain the same first fields | |
92 | and si->prev->next == si->idx needs to be verified. */ | |
93 | int first; | |
94 | int next; | |
95 | int prev; | |
96 | /* A flag whether the string is known to be written in the current | |
97 | function. */ | |
98 | bool writable; | |
99 | /* A flag for the next maybe_invalidate that this strinfo shouldn't | |
100 | be invalidated. Always cleared by maybe_invalidate. */ | |
101 | bool dont_invalidate; | |
526ceb68 | 102 | }; |
8b57bfeb JJ |
103 | |
104 | /* Pool for allocating strinfo_struct entries. */ | |
526ceb68 | 105 | static object_allocator<strinfo> strinfo_pool ("strinfo pool"); |
8b57bfeb JJ |
106 | |
107 | /* Vector mapping positive string indexes to strinfo, for the | |
108 | current basic block. The first pointer in the vector is special, | |
109 | it is either NULL, meaning the vector isn't shared, or it is | |
110 | a basic block pointer to the owner basic_block if shared. | |
111 | If some other bb wants to modify the vector, the vector needs | |
112 | to be unshared first, and only the owner bb is supposed to free it. */ | |
526ceb68 | 113 | static vec<strinfo *, va_heap, vl_embed> *stridx_to_strinfo; |
8b57bfeb JJ |
114 | |
115 | /* One OFFSET->IDX mapping. */ | |
116 | struct stridxlist | |
117 | { | |
118 | struct stridxlist *next; | |
119 | HOST_WIDE_INT offset; | |
120 | int idx; | |
121 | }; | |
122 | ||
123 | /* Hash table entry, mapping a DECL to a chain of OFFSET->IDX mappings. */ | |
124 | struct decl_stridxlist_map | |
125 | { | |
126 | struct tree_map_base base; | |
127 | struct stridxlist list; | |
128 | }; | |
129 | ||
130 | /* Hash table for mapping decls to a chained list of offset -> idx | |
131 | mappings. */ | |
fb5c464a | 132 | static hash_map<tree_decl_hash, stridxlist> *decl_to_stridxlist_htab; |
8b57bfeb JJ |
133 | |
134 | /* Obstack for struct stridxlist and struct decl_stridxlist_map. */ | |
135 | static struct obstack stridx_obstack; | |
136 | ||
137 | /* Last memcpy statement if it could be adjusted if the trailing | |
138 | '\0' written is immediately overwritten, or | |
139 | *x = '\0' store that could be removed if it is immediately overwritten. */ | |
140 | struct laststmt_struct | |
141 | { | |
355fe088 | 142 | gimple *stmt; |
8b57bfeb JJ |
143 | tree len; |
144 | int stridx; | |
145 | } laststmt; | |
146 | ||
526ceb68 | 147 | static int get_stridx_plus_constant (strinfo *, HOST_WIDE_INT, tree); |
204a913b JJ |
148 | |
149 | /* Return strinfo vector entry IDX. */ | |
150 | ||
526ceb68 | 151 | static inline strinfo * |
204a913b JJ |
152 | get_strinfo (int idx) |
153 | { | |
154 | if (vec_safe_length (stridx_to_strinfo) <= (unsigned int) idx) | |
155 | return NULL; | |
156 | return (*stridx_to_strinfo)[idx]; | |
157 | } | |
158 | ||
8b57bfeb JJ |
159 | /* Helper function for get_stridx. */ |
160 | ||
161 | static int | |
5f3cd7c3 | 162 | get_addr_stridx (tree exp, tree ptr) |
8b57bfeb JJ |
163 | { |
164 | HOST_WIDE_INT off; | |
5f3cd7c3 | 165 | struct stridxlist *list, *last = NULL; |
8b57bfeb JJ |
166 | tree base; |
167 | ||
c203e8a7 | 168 | if (!decl_to_stridxlist_htab) |
8b57bfeb JJ |
169 | return 0; |
170 | ||
171 | base = get_addr_base_and_unit_offset (exp, &off); | |
172 | if (base == NULL || !DECL_P (base)) | |
173 | return 0; | |
174 | ||
1eb68d2d TS |
175 | list = decl_to_stridxlist_htab->get (base); |
176 | if (list == NULL) | |
8b57bfeb JJ |
177 | return 0; |
178 | ||
8b57bfeb JJ |
179 | do |
180 | { | |
181 | if (list->offset == off) | |
182 | return list->idx; | |
5f3cd7c3 JJ |
183 | if (list->offset > off) |
184 | return 0; | |
185 | last = list; | |
8b57bfeb JJ |
186 | list = list->next; |
187 | } | |
188 | while (list); | |
5f3cd7c3 JJ |
189 | |
190 | if (ptr && last && last->idx > 0) | |
191 | { | |
192 | strinfo *si = get_strinfo (last->idx); | |
193 | if (si | |
194 | && si->length | |
195 | && TREE_CODE (si->length) == INTEGER_CST | |
196 | && compare_tree_int (si->length, off - last->offset) != -1) | |
197 | return get_stridx_plus_constant (si, off - last->offset, ptr); | |
198 | } | |
8b57bfeb JJ |
199 | return 0; |
200 | } | |
201 | ||
202 | /* Return string index for EXP. */ | |
203 | ||
204 | static int | |
205 | get_stridx (tree exp) | |
206 | { | |
b3c3685a | 207 | tree s, o; |
8b57bfeb JJ |
208 | |
209 | if (TREE_CODE (exp) == SSA_NAME) | |
204a913b JJ |
210 | { |
211 | if (ssa_ver_to_stridx[SSA_NAME_VERSION (exp)]) | |
212 | return ssa_ver_to_stridx[SSA_NAME_VERSION (exp)]; | |
213 | int i; | |
214 | tree e = exp; | |
215 | HOST_WIDE_INT off = 0; | |
216 | for (i = 0; i < 5; i++) | |
217 | { | |
355fe088 | 218 | gimple *def_stmt = SSA_NAME_DEF_STMT (e); |
204a913b JJ |
219 | if (!is_gimple_assign (def_stmt) |
220 | || gimple_assign_rhs_code (def_stmt) != POINTER_PLUS_EXPR) | |
221 | return 0; | |
222 | tree rhs1 = gimple_assign_rhs1 (def_stmt); | |
223 | tree rhs2 = gimple_assign_rhs2 (def_stmt); | |
224 | if (TREE_CODE (rhs1) != SSA_NAME | |
225 | || !tree_fits_shwi_p (rhs2)) | |
226 | return 0; | |
227 | HOST_WIDE_INT this_off = tree_to_shwi (rhs2); | |
228 | if (this_off < 0) | |
229 | return 0; | |
230 | off = (unsigned HOST_WIDE_INT) off + this_off; | |
231 | if (off < 0) | |
232 | return 0; | |
233 | if (ssa_ver_to_stridx[SSA_NAME_VERSION (rhs1)]) | |
234 | { | |
526ceb68 | 235 | strinfo *si |
204a913b JJ |
236 | = get_strinfo (ssa_ver_to_stridx[SSA_NAME_VERSION (rhs1)]); |
237 | if (si | |
238 | && si->length | |
239 | && TREE_CODE (si->length) == INTEGER_CST | |
240 | && compare_tree_int (si->length, off) != -1) | |
241 | return get_stridx_plus_constant (si, off, exp); | |
242 | } | |
243 | e = rhs1; | |
244 | } | |
245 | return 0; | |
246 | } | |
8b57bfeb JJ |
247 | |
248 | if (TREE_CODE (exp) == ADDR_EXPR) | |
249 | { | |
5f3cd7c3 | 250 | int idx = get_addr_stridx (TREE_OPERAND (exp, 0), exp); |
8b57bfeb JJ |
251 | if (idx != 0) |
252 | return idx; | |
253 | } | |
254 | ||
b3c3685a JJ |
255 | s = string_constant (exp, &o); |
256 | if (s != NULL_TREE | |
9541ffee | 257 | && (o == NULL_TREE || tree_fits_shwi_p (o)) |
b3c3685a | 258 | && TREE_STRING_LENGTH (s) > 0) |
8b57bfeb | 259 | { |
9439e9a1 | 260 | HOST_WIDE_INT offset = o ? tree_to_shwi (o) : 0; |
b3c3685a JJ |
261 | const char *p = TREE_STRING_POINTER (s); |
262 | int max = TREE_STRING_LENGTH (s) - 1; | |
263 | ||
264 | if (p[max] == '\0' && offset >= 0 && offset <= max) | |
265 | return ~(int) strlen (p + offset); | |
8b57bfeb JJ |
266 | } |
267 | return 0; | |
268 | } | |
269 | ||
270 | /* Return true if strinfo vector is shared with the immediate dominator. */ | |
271 | ||
272 | static inline bool | |
273 | strinfo_shared (void) | |
274 | { | |
9771b263 DN |
275 | return vec_safe_length (stridx_to_strinfo) |
276 | && (*stridx_to_strinfo)[0] != NULL; | |
8b57bfeb JJ |
277 | } |
278 | ||
279 | /* Unshare strinfo vector that is shared with the immediate dominator. */ | |
280 | ||
281 | static void | |
282 | unshare_strinfo_vec (void) | |
283 | { | |
526ceb68 | 284 | strinfo *si; |
8b57bfeb JJ |
285 | unsigned int i = 0; |
286 | ||
287 | gcc_assert (strinfo_shared ()); | |
9771b263 DN |
288 | stridx_to_strinfo = vec_safe_copy (stridx_to_strinfo); |
289 | for (i = 1; vec_safe_iterate (stridx_to_strinfo, i, &si); ++i) | |
8b57bfeb JJ |
290 | if (si != NULL) |
291 | si->refcount++; | |
9771b263 | 292 | (*stridx_to_strinfo)[0] = NULL; |
8b57bfeb JJ |
293 | } |
294 | ||
295 | /* Attempt to create a string index for exp, ADDR_EXPR's operand. | |
296 | Return a pointer to the location where the string index can | |
297 | be stored (if 0) or is stored, or NULL if this can't be tracked. */ | |
298 | ||
299 | static int * | |
300 | addr_stridxptr (tree exp) | |
301 | { | |
8b57bfeb JJ |
302 | HOST_WIDE_INT off; |
303 | ||
304 | tree base = get_addr_base_and_unit_offset (exp, &off); | |
305 | if (base == NULL_TREE || !DECL_P (base)) | |
306 | return NULL; | |
307 | ||
c203e8a7 | 308 | if (!decl_to_stridxlist_htab) |
8b57bfeb | 309 | { |
1eb68d2d | 310 | decl_to_stridxlist_htab |
fb5c464a | 311 | = new hash_map<tree_decl_hash, stridxlist> (64); |
8b57bfeb JJ |
312 | gcc_obstack_init (&stridx_obstack); |
313 | } | |
1eb68d2d TS |
314 | |
315 | bool existed; | |
316 | stridxlist *list = &decl_to_stridxlist_htab->get_or_insert (base, &existed); | |
317 | if (existed) | |
8b57bfeb JJ |
318 | { |
319 | int i; | |
5f3cd7c3 JJ |
320 | stridxlist *before = NULL; |
321 | for (i = 0; i < 32; i++) | |
8b57bfeb JJ |
322 | { |
323 | if (list->offset == off) | |
324 | return &list->idx; | |
5f3cd7c3 JJ |
325 | if (list->offset > off && before == NULL) |
326 | before = list; | |
8b57bfeb JJ |
327 | if (list->next == NULL) |
328 | break; | |
5f3cd7c3 | 329 | list = list->next; |
8b57bfeb | 330 | } |
5f3cd7c3 | 331 | if (i == 32) |
8b57bfeb | 332 | return NULL; |
5f3cd7c3 JJ |
333 | if (before) |
334 | { | |
335 | list = before; | |
336 | before = XOBNEW (&stridx_obstack, struct stridxlist); | |
337 | *before = *list; | |
338 | list->next = before; | |
339 | list->offset = off; | |
340 | list->idx = 0; | |
341 | return &list->idx; | |
342 | } | |
8b57bfeb JJ |
343 | list->next = XOBNEW (&stridx_obstack, struct stridxlist); |
344 | list = list->next; | |
345 | } | |
1eb68d2d | 346 | |
8b57bfeb JJ |
347 | list->next = NULL; |
348 | list->offset = off; | |
349 | list->idx = 0; | |
350 | return &list->idx; | |
351 | } | |
352 | ||
353 | /* Create a new string index, or return 0 if reached limit. */ | |
354 | ||
355 | static int | |
356 | new_stridx (tree exp) | |
357 | { | |
358 | int idx; | |
359 | if (max_stridx >= PARAM_VALUE (PARAM_MAX_TRACKED_STRLENS)) | |
360 | return 0; | |
361 | if (TREE_CODE (exp) == SSA_NAME) | |
362 | { | |
363 | if (SSA_NAME_OCCURS_IN_ABNORMAL_PHI (exp)) | |
364 | return 0; | |
365 | idx = max_stridx++; | |
9771b263 | 366 | ssa_ver_to_stridx[SSA_NAME_VERSION (exp)] = idx; |
8b57bfeb JJ |
367 | return idx; |
368 | } | |
369 | if (TREE_CODE (exp) == ADDR_EXPR) | |
370 | { | |
371 | int *pidx = addr_stridxptr (TREE_OPERAND (exp, 0)); | |
372 | if (pidx != NULL) | |
373 | { | |
374 | gcc_assert (*pidx == 0); | |
375 | *pidx = max_stridx++; | |
376 | return *pidx; | |
377 | } | |
378 | } | |
379 | return 0; | |
380 | } | |
381 | ||
382 | /* Like new_stridx, but for ADDR_EXPR's operand instead. */ | |
383 | ||
384 | static int | |
385 | new_addr_stridx (tree exp) | |
386 | { | |
387 | int *pidx; | |
388 | if (max_stridx >= PARAM_VALUE (PARAM_MAX_TRACKED_STRLENS)) | |
389 | return 0; | |
390 | pidx = addr_stridxptr (exp); | |
391 | if (pidx != NULL) | |
392 | { | |
393 | gcc_assert (*pidx == 0); | |
394 | *pidx = max_stridx++; | |
395 | return *pidx; | |
396 | } | |
397 | return 0; | |
398 | } | |
399 | ||
400 | /* Create a new strinfo. */ | |
401 | ||
526ceb68 | 402 | static strinfo * |
8b57bfeb JJ |
403 | new_strinfo (tree ptr, int idx, tree length) |
404 | { | |
526ceb68 | 405 | strinfo *si = strinfo_pool.allocate (); |
8b57bfeb JJ |
406 | si->length = length; |
407 | si->ptr = ptr; | |
408 | si->stmt = NULL; | |
409 | si->endptr = NULL_TREE; | |
410 | si->refcount = 1; | |
411 | si->idx = idx; | |
412 | si->first = 0; | |
413 | si->prev = 0; | |
414 | si->next = 0; | |
415 | si->writable = false; | |
416 | si->dont_invalidate = false; | |
417 | return si; | |
418 | } | |
419 | ||
420 | /* Decrease strinfo refcount and free it if not referenced anymore. */ | |
421 | ||
422 | static inline void | |
526ceb68 | 423 | free_strinfo (strinfo *si) |
8b57bfeb JJ |
424 | { |
425 | if (si && --si->refcount == 0) | |
33e7d32e | 426 | strinfo_pool.remove (si); |
8b57bfeb JJ |
427 | } |
428 | ||
8b57bfeb JJ |
429 | /* Set strinfo in the vector entry IDX to SI. */ |
430 | ||
431 | static inline void | |
526ceb68 | 432 | set_strinfo (int idx, strinfo *si) |
8b57bfeb | 433 | { |
9771b263 | 434 | if (vec_safe_length (stridx_to_strinfo) && (*stridx_to_strinfo)[0]) |
8b57bfeb | 435 | unshare_strinfo_vec (); |
9771b263 DN |
436 | if (vec_safe_length (stridx_to_strinfo) <= (unsigned int) idx) |
437 | vec_safe_grow_cleared (stridx_to_strinfo, idx + 1); | |
438 | (*stridx_to_strinfo)[idx] = si; | |
8b57bfeb JJ |
439 | } |
440 | ||
441 | /* Return string length, or NULL if it can't be computed. */ | |
442 | ||
443 | static tree | |
526ceb68 | 444 | get_string_length (strinfo *si) |
8b57bfeb JJ |
445 | { |
446 | if (si->length) | |
447 | return si->length; | |
448 | ||
449 | if (si->stmt) | |
450 | { | |
355fe088 | 451 | gimple *stmt = si->stmt, *lenstmt; |
f5fc4a04 | 452 | bool with_bounds = gimple_call_with_bounds_p (stmt); |
83d5977e | 453 | tree callee, lhs, fn, tem; |
8b57bfeb JJ |
454 | location_t loc; |
455 | gimple_stmt_iterator gsi; | |
456 | ||
457 | gcc_assert (is_gimple_call (stmt)); | |
458 | callee = gimple_call_fndecl (stmt); | |
459 | gcc_assert (callee && DECL_BUILT_IN_CLASS (callee) == BUILT_IN_NORMAL); | |
460 | lhs = gimple_call_lhs (stmt); | |
8b57bfeb JJ |
461 | /* unshare_strinfo is intentionally not called here. The (delayed) |
462 | transformation of strcpy or strcat into stpcpy is done at the place | |
463 | of the former strcpy/strcat call and so can affect all the strinfos | |
464 | with the same stmt. If they were unshared before and transformation | |
465 | has been already done, the handling of BUILT_IN_STPCPY{,_CHK} should | |
466 | just compute the right length. */ | |
467 | switch (DECL_FUNCTION_CODE (callee)) | |
468 | { | |
469 | case BUILT_IN_STRCAT: | |
470 | case BUILT_IN_STRCAT_CHK: | |
f5fc4a04 IE |
471 | case BUILT_IN_STRCAT_CHKP: |
472 | case BUILT_IN_STRCAT_CHK_CHKP: | |
8b57bfeb | 473 | gsi = gsi_for_stmt (stmt); |
e79983f4 | 474 | fn = builtin_decl_implicit (BUILT_IN_STRLEN); |
8b57bfeb | 475 | gcc_assert (lhs == NULL_TREE); |
8b57bfeb | 476 | tem = unshare_expr (gimple_call_arg (stmt, 0)); |
f5fc4a04 IE |
477 | if (with_bounds) |
478 | { | |
479 | lenstmt = gimple_build_call (chkp_maybe_create_clone (fn)->decl, | |
480 | 2, tem, gimple_call_arg (stmt, 1)); | |
481 | gimple_call_set_with_bounds (lenstmt, true); | |
482 | } | |
483 | else | |
484 | lenstmt = gimple_build_call (fn, 1, tem); | |
83d5977e | 485 | lhs = make_ssa_name (TREE_TYPE (TREE_TYPE (fn)), lenstmt); |
8b57bfeb JJ |
486 | gimple_call_set_lhs (lenstmt, lhs); |
487 | gimple_set_vuse (lenstmt, gimple_vuse (stmt)); | |
488 | gsi_insert_before (&gsi, lenstmt, GSI_SAME_STMT); | |
8b57bfeb | 489 | tem = gimple_call_arg (stmt, 0); |
33960e2e TG |
490 | if (!ptrofftype_p (TREE_TYPE (lhs))) |
491 | { | |
492 | lhs = convert_to_ptrofftype (lhs); | |
493 | lhs = force_gimple_operand_gsi (&gsi, lhs, true, NULL_TREE, | |
494 | true, GSI_SAME_STMT); | |
495 | } | |
0d0e4a03 JJ |
496 | lenstmt = gimple_build_assign |
497 | (make_ssa_name (TREE_TYPE (gimple_call_arg (stmt, 0))), | |
498 | POINTER_PLUS_EXPR,tem, lhs); | |
8b57bfeb JJ |
499 | gsi_insert_before (&gsi, lenstmt, GSI_SAME_STMT); |
500 | gimple_call_set_arg (stmt, 0, gimple_assign_lhs (lenstmt)); | |
501 | lhs = NULL_TREE; | |
502 | /* FALLTHRU */ | |
503 | case BUILT_IN_STRCPY: | |
504 | case BUILT_IN_STRCPY_CHK: | |
f5fc4a04 IE |
505 | case BUILT_IN_STRCPY_CHKP: |
506 | case BUILT_IN_STRCPY_CHK_CHKP: | |
1e762c6a | 507 | gcc_assert (builtin_decl_implicit_p (BUILT_IN_STPCPY)); |
f5fc4a04 | 508 | if (gimple_call_num_args (stmt) == (with_bounds ? 4 : 2)) |
e79983f4 | 509 | fn = builtin_decl_implicit (BUILT_IN_STPCPY); |
8b57bfeb | 510 | else |
e79983f4 | 511 | fn = builtin_decl_explicit (BUILT_IN_STPCPY_CHK); |
f5fc4a04 IE |
512 | if (with_bounds) |
513 | fn = chkp_maybe_create_clone (fn)->decl; | |
8b57bfeb JJ |
514 | gcc_assert (lhs == NULL_TREE); |
515 | if (dump_file && (dump_flags & TDF_DETAILS) != 0) | |
516 | { | |
517 | fprintf (dump_file, "Optimizing: "); | |
518 | print_gimple_stmt (dump_file, stmt, 0, TDF_SLIM); | |
519 | } | |
520 | gimple_call_set_fndecl (stmt, fn); | |
83d5977e | 521 | lhs = make_ssa_name (TREE_TYPE (TREE_TYPE (fn)), stmt); |
8b57bfeb JJ |
522 | gimple_call_set_lhs (stmt, lhs); |
523 | update_stmt (stmt); | |
524 | if (dump_file && (dump_flags & TDF_DETAILS) != 0) | |
525 | { | |
526 | fprintf (dump_file, "into: "); | |
527 | print_gimple_stmt (dump_file, stmt, 0, TDF_SLIM); | |
528 | } | |
529 | /* FALLTHRU */ | |
530 | case BUILT_IN_STPCPY: | |
531 | case BUILT_IN_STPCPY_CHK: | |
f5fc4a04 IE |
532 | case BUILT_IN_STPCPY_CHKP: |
533 | case BUILT_IN_STPCPY_CHK_CHKP: | |
8b57bfeb JJ |
534 | gcc_assert (lhs != NULL_TREE); |
535 | loc = gimple_location (stmt); | |
536 | si->endptr = lhs; | |
537 | si->stmt = NULL; | |
538 | lhs = fold_convert_loc (loc, size_type_node, lhs); | |
539 | si->length = fold_convert_loc (loc, size_type_node, si->ptr); | |
540 | si->length = fold_build2_loc (loc, MINUS_EXPR, size_type_node, | |
541 | lhs, si->length); | |
542 | break; | |
24314386 MG |
543 | case BUILT_IN_MALLOC: |
544 | break; | |
545 | /* BUILT_IN_CALLOC always has si->length set. */ | |
8b57bfeb JJ |
546 | default: |
547 | gcc_unreachable (); | |
548 | break; | |
549 | } | |
550 | } | |
551 | ||
552 | return si->length; | |
553 | } | |
554 | ||
555 | /* Invalidate string length information for strings whose length | |
556 | might change due to stores in stmt. */ | |
557 | ||
558 | static bool | |
355fe088 | 559 | maybe_invalidate (gimple *stmt) |
8b57bfeb | 560 | { |
526ceb68 | 561 | strinfo *si; |
8b57bfeb JJ |
562 | unsigned int i; |
563 | bool nonempty = false; | |
564 | ||
9771b263 | 565 | for (i = 1; vec_safe_iterate (stridx_to_strinfo, i, &si); ++i) |
8b57bfeb JJ |
566 | if (si != NULL) |
567 | { | |
568 | if (!si->dont_invalidate) | |
569 | { | |
570 | ao_ref r; | |
24314386 | 571 | /* Do not use si->length. */ |
8b57bfeb JJ |
572 | ao_ref_init_from_ptr_and_size (&r, si->ptr, NULL_TREE); |
573 | if (stmt_may_clobber_ref_p_1 (stmt, &r)) | |
574 | { | |
575 | set_strinfo (i, NULL); | |
576 | free_strinfo (si); | |
577 | continue; | |
578 | } | |
579 | } | |
580 | si->dont_invalidate = false; | |
581 | nonempty = true; | |
582 | } | |
583 | return nonempty; | |
584 | } | |
585 | ||
204a913b | 586 | /* Unshare strinfo record SI, if it has refcount > 1 or |
8b57bfeb JJ |
587 | if stridx_to_strinfo vector is shared with some other |
588 | bbs. */ | |
589 | ||
526ceb68 TS |
590 | static strinfo * |
591 | unshare_strinfo (strinfo *si) | |
8b57bfeb | 592 | { |
526ceb68 | 593 | strinfo *nsi; |
8b57bfeb JJ |
594 | |
595 | if (si->refcount == 1 && !strinfo_shared ()) | |
596 | return si; | |
597 | ||
598 | nsi = new_strinfo (si->ptr, si->idx, si->length); | |
599 | nsi->stmt = si->stmt; | |
600 | nsi->endptr = si->endptr; | |
601 | nsi->first = si->first; | |
602 | nsi->prev = si->prev; | |
603 | nsi->next = si->next; | |
604 | nsi->writable = si->writable; | |
605 | set_strinfo (si->idx, nsi); | |
606 | free_strinfo (si); | |
607 | return nsi; | |
608 | } | |
609 | ||
610 | /* Return first strinfo in the related strinfo chain | |
611 | if all strinfos in between belong to the chain, otherwise | |
612 | NULL. */ | |
613 | ||
526ceb68 TS |
614 | static strinfo * |
615 | verify_related_strinfos (strinfo *origsi) | |
8b57bfeb | 616 | { |
526ceb68 | 617 | strinfo *si = origsi, *psi; |
8b57bfeb JJ |
618 | |
619 | if (origsi->first == 0) | |
620 | return NULL; | |
621 | for (; si->prev; si = psi) | |
622 | { | |
623 | if (si->first != origsi->first) | |
624 | return NULL; | |
625 | psi = get_strinfo (si->prev); | |
626 | if (psi == NULL) | |
627 | return NULL; | |
628 | if (psi->next != si->idx) | |
629 | return NULL; | |
630 | } | |
631 | if (si->idx != si->first) | |
632 | return NULL; | |
633 | return si; | |
634 | } | |
635 | ||
204a913b JJ |
636 | /* Attempt to create a new strinfo for BASESI + OFF, or find existing |
637 | strinfo if there is any. Return it's idx, or 0 if no strinfo has | |
638 | been created. */ | |
639 | ||
640 | static int | |
526ceb68 | 641 | get_stridx_plus_constant (strinfo *basesi, HOST_WIDE_INT off, tree ptr) |
204a913b | 642 | { |
5f3cd7c3 | 643 | if (TREE_CODE (ptr) == SSA_NAME && SSA_NAME_OCCURS_IN_ABNORMAL_PHI (ptr)) |
204a913b JJ |
644 | return 0; |
645 | ||
646 | if (basesi->length == NULL_TREE | |
647 | || TREE_CODE (basesi->length) != INTEGER_CST | |
648 | || compare_tree_int (basesi->length, off) == -1 | |
649 | || !tree_fits_shwi_p (basesi->length)) | |
650 | return 0; | |
651 | ||
652 | HOST_WIDE_INT len = tree_to_shwi (basesi->length) - off; | |
526ceb68 | 653 | strinfo *si = basesi, *chainsi; |
204a913b JJ |
654 | if (si->first || si->prev || si->next) |
655 | si = verify_related_strinfos (basesi); | |
656 | if (si == NULL | |
657 | || si->length == NULL_TREE | |
658 | || TREE_CODE (si->length) != INTEGER_CST) | |
659 | return 0; | |
660 | ||
5f3cd7c3 JJ |
661 | if (TREE_CODE (ptr) == SSA_NAME |
662 | && ssa_ver_to_stridx.length () <= SSA_NAME_VERSION (ptr)) | |
204a913b JJ |
663 | ssa_ver_to_stridx.safe_grow_cleared (num_ssa_names); |
664 | ||
665 | gcc_checking_assert (compare_tree_int (si->length, off) != -1); | |
666 | for (chainsi = si; chainsi->next; chainsi = si) | |
667 | { | |
668 | si = get_strinfo (chainsi->next); | |
669 | if (si == NULL | |
670 | || si->first != chainsi->first | |
671 | || si->prev != chainsi->idx | |
672 | || si->length == NULL_TREE | |
673 | || TREE_CODE (si->length) != INTEGER_CST) | |
674 | break; | |
675 | int r = compare_tree_int (si->length, len); | |
676 | if (r != 1) | |
677 | { | |
678 | if (r == 0) | |
679 | { | |
55a0f21a JJ |
680 | if (TREE_CODE (ptr) == SSA_NAME) |
681 | ssa_ver_to_stridx[SSA_NAME_VERSION (ptr)] = si->idx; | |
682 | else | |
683 | { | |
684 | int *pidx = addr_stridxptr (TREE_OPERAND (ptr, 0)); | |
685 | if (pidx != NULL && *pidx == 0) | |
686 | *pidx = si->idx; | |
687 | } | |
204a913b JJ |
688 | return si->idx; |
689 | } | |
690 | break; | |
691 | } | |
692 | } | |
693 | ||
694 | int idx = new_stridx (ptr); | |
695 | if (idx == 0) | |
696 | return 0; | |
697 | si = new_strinfo (ptr, idx, build_int_cst (size_type_node, len)); | |
698 | set_strinfo (idx, si); | |
699 | if (chainsi->next) | |
700 | { | |
526ceb68 | 701 | strinfo *nextsi = unshare_strinfo (get_strinfo (chainsi->next)); |
204a913b JJ |
702 | si->next = nextsi->idx; |
703 | nextsi->prev = idx; | |
704 | } | |
705 | chainsi = unshare_strinfo (chainsi); | |
706 | if (chainsi->first == 0) | |
707 | chainsi->first = chainsi->idx; | |
708 | chainsi->next = idx; | |
709 | if (chainsi->endptr == NULL_TREE && len == 0) | |
710 | chainsi->endptr = ptr; | |
711 | si->endptr = chainsi->endptr; | |
712 | si->prev = chainsi->idx; | |
713 | si->first = chainsi->first; | |
714 | si->writable = chainsi->writable; | |
715 | return si->idx; | |
716 | } | |
717 | ||
8b57bfeb JJ |
718 | /* Note that PTR, a pointer SSA_NAME initialized in the current stmt, points |
719 | to a zero-length string and if possible chain it to a related strinfo | |
720 | chain whose part is or might be CHAINSI. */ | |
721 | ||
526ceb68 TS |
722 | static strinfo * |
723 | zero_length_string (tree ptr, strinfo *chainsi) | |
8b57bfeb | 724 | { |
526ceb68 | 725 | strinfo *si; |
8b57bfeb | 726 | int idx; |
204a913b JJ |
727 | if (ssa_ver_to_stridx.length () <= SSA_NAME_VERSION (ptr)) |
728 | ssa_ver_to_stridx.safe_grow_cleared (num_ssa_names); | |
8b57bfeb | 729 | gcc_checking_assert (TREE_CODE (ptr) == SSA_NAME |
204a913b | 730 | && ssa_ver_to_stridx[SSA_NAME_VERSION (ptr)] == 0); |
8b57bfeb JJ |
731 | |
732 | if (SSA_NAME_OCCURS_IN_ABNORMAL_PHI (ptr)) | |
733 | return NULL; | |
734 | if (chainsi != NULL) | |
735 | { | |
736 | si = verify_related_strinfos (chainsi); | |
737 | if (si) | |
738 | { | |
739 | chainsi = si; | |
740 | for (; chainsi->next; chainsi = si) | |
741 | { | |
742 | if (chainsi->endptr == NULL_TREE) | |
743 | { | |
744 | chainsi = unshare_strinfo (chainsi); | |
745 | chainsi->endptr = ptr; | |
746 | } | |
747 | si = get_strinfo (chainsi->next); | |
748 | if (si == NULL | |
749 | || si->first != chainsi->first | |
750 | || si->prev != chainsi->idx) | |
751 | break; | |
752 | } | |
93a90db6 | 753 | gcc_assert (chainsi->length || chainsi->stmt); |
8b57bfeb JJ |
754 | if (chainsi->endptr == NULL_TREE) |
755 | { | |
756 | chainsi = unshare_strinfo (chainsi); | |
757 | chainsi->endptr = ptr; | |
758 | } | |
93a90db6 | 759 | if (chainsi->length && integer_zerop (chainsi->length)) |
8b57bfeb JJ |
760 | { |
761 | if (chainsi->next) | |
762 | { | |
763 | chainsi = unshare_strinfo (chainsi); | |
764 | chainsi->next = 0; | |
765 | } | |
9771b263 | 766 | ssa_ver_to_stridx[SSA_NAME_VERSION (ptr)] = chainsi->idx; |
8b57bfeb JJ |
767 | return chainsi; |
768 | } | |
769 | } | |
770 | else if (chainsi->first || chainsi->prev || chainsi->next) | |
771 | { | |
772 | chainsi = unshare_strinfo (chainsi); | |
773 | chainsi->first = 0; | |
774 | chainsi->prev = 0; | |
775 | chainsi->next = 0; | |
776 | } | |
777 | } | |
778 | idx = new_stridx (ptr); | |
779 | if (idx == 0) | |
780 | return NULL; | |
781 | si = new_strinfo (ptr, idx, build_int_cst (size_type_node, 0)); | |
782 | set_strinfo (idx, si); | |
783 | si->endptr = ptr; | |
784 | if (chainsi != NULL) | |
785 | { | |
786 | chainsi = unshare_strinfo (chainsi); | |
787 | if (chainsi->first == 0) | |
788 | chainsi->first = chainsi->idx; | |
789 | chainsi->next = idx; | |
93a90db6 AK |
790 | if (chainsi->endptr == NULL_TREE) |
791 | chainsi->endptr = ptr; | |
8b57bfeb JJ |
792 | si->prev = chainsi->idx; |
793 | si->first = chainsi->first; | |
794 | si->writable = chainsi->writable; | |
795 | } | |
796 | return si; | |
797 | } | |
798 | ||
799 | /* For strinfo ORIGSI whose length has been just updated | |
800 | update also related strinfo lengths (add ADJ to each, | |
801 | but don't adjust ORIGSI). */ | |
802 | ||
803 | static void | |
526ceb68 | 804 | adjust_related_strinfos (location_t loc, strinfo *origsi, tree adj) |
8b57bfeb | 805 | { |
526ceb68 | 806 | strinfo *si = verify_related_strinfos (origsi); |
8b57bfeb JJ |
807 | |
808 | if (si == NULL) | |
809 | return; | |
810 | ||
811 | while (1) | |
812 | { | |
526ceb68 | 813 | strinfo *nsi; |
8b57bfeb JJ |
814 | |
815 | if (si != origsi) | |
816 | { | |
817 | tree tem; | |
818 | ||
819 | si = unshare_strinfo (si); | |
93a90db6 AK |
820 | if (si->length) |
821 | { | |
822 | tem = fold_convert_loc (loc, TREE_TYPE (si->length), adj); | |
823 | si->length = fold_build2_loc (loc, PLUS_EXPR, | |
824 | TREE_TYPE (si->length), si->length, | |
825 | tem); | |
826 | } | |
827 | else if (si->stmt != NULL) | |
828 | /* Delayed length computation is unaffected. */ | |
829 | ; | |
830 | else | |
831 | gcc_unreachable (); | |
832 | ||
8b57bfeb JJ |
833 | si->endptr = NULL_TREE; |
834 | si->dont_invalidate = true; | |
835 | } | |
836 | if (si->next == 0) | |
837 | return; | |
838 | nsi = get_strinfo (si->next); | |
839 | if (nsi == NULL | |
840 | || nsi->first != si->first | |
841 | || nsi->prev != si->idx) | |
842 | return; | |
843 | si = nsi; | |
844 | } | |
845 | } | |
846 | ||
847 | /* Find if there are other SSA_NAME pointers equal to PTR | |
848 | for which we don't track their string lengths yet. If so, use | |
849 | IDX for them. */ | |
850 | ||
851 | static void | |
852 | find_equal_ptrs (tree ptr, int idx) | |
853 | { | |
854 | if (TREE_CODE (ptr) != SSA_NAME) | |
855 | return; | |
856 | while (1) | |
857 | { | |
355fe088 | 858 | gimple *stmt = SSA_NAME_DEF_STMT (ptr); |
8b57bfeb JJ |
859 | if (!is_gimple_assign (stmt)) |
860 | return; | |
861 | ptr = gimple_assign_rhs1 (stmt); | |
862 | switch (gimple_assign_rhs_code (stmt)) | |
863 | { | |
864 | case SSA_NAME: | |
865 | break; | |
97246d78 JJ |
866 | CASE_CONVERT: |
867 | if (!POINTER_TYPE_P (TREE_TYPE (ptr))) | |
868 | return; | |
869 | if (TREE_CODE (ptr) == SSA_NAME) | |
870 | break; | |
871 | if (TREE_CODE (ptr) != ADDR_EXPR) | |
872 | return; | |
873 | /* FALLTHRU */ | |
8b57bfeb JJ |
874 | case ADDR_EXPR: |
875 | { | |
876 | int *pidx = addr_stridxptr (TREE_OPERAND (ptr, 0)); | |
877 | if (pidx != NULL && *pidx == 0) | |
878 | *pidx = idx; | |
879 | return; | |
880 | } | |
8b57bfeb JJ |
881 | default: |
882 | return; | |
883 | } | |
884 | ||
885 | /* We might find an endptr created in this pass. Grow the | |
886 | vector in that case. */ | |
9771b263 DN |
887 | if (ssa_ver_to_stridx.length () <= SSA_NAME_VERSION (ptr)) |
888 | ssa_ver_to_stridx.safe_grow_cleared (num_ssa_names); | |
8b57bfeb | 889 | |
9771b263 | 890 | if (ssa_ver_to_stridx[SSA_NAME_VERSION (ptr)] != 0) |
8b57bfeb | 891 | return; |
9771b263 | 892 | ssa_ver_to_stridx[SSA_NAME_VERSION (ptr)] = idx; |
8b57bfeb JJ |
893 | } |
894 | } | |
895 | ||
0ad84f34 JJ |
896 | /* Return true if STMT is a call to a builtin function with the right |
897 | arguments and attributes that should be considered for optimization | |
898 | by this pass. */ | |
899 | ||
900 | static bool | |
901 | valid_builtin_call (gimple *stmt) | |
902 | { | |
903 | if (!gimple_call_builtin_p (stmt, BUILT_IN_NORMAL)) | |
904 | return false; | |
905 | ||
906 | tree callee = gimple_call_fndecl (stmt); | |
907 | switch (DECL_FUNCTION_CODE (callee)) | |
908 | { | |
909 | case BUILT_IN_MEMCMP: | |
910 | case BUILT_IN_MEMCMP_EQ: | |
911 | case BUILT_IN_STRCHR: | |
912 | case BUILT_IN_STRCHR_CHKP: | |
913 | case BUILT_IN_STRLEN: | |
914 | case BUILT_IN_STRLEN_CHKP: | |
915 | /* The above functions should be pure. Punt if they aren't. */ | |
916 | if (gimple_vdef (stmt) || gimple_vuse (stmt) == NULL_TREE) | |
917 | return false; | |
918 | break; | |
919 | ||
920 | case BUILT_IN_CALLOC: | |
921 | case BUILT_IN_MALLOC: | |
922 | case BUILT_IN_MEMCPY: | |
923 | case BUILT_IN_MEMCPY_CHK: | |
924 | case BUILT_IN_MEMCPY_CHKP: | |
925 | case BUILT_IN_MEMCPY_CHK_CHKP: | |
926 | case BUILT_IN_MEMPCPY: | |
927 | case BUILT_IN_MEMPCPY_CHK: | |
928 | case BUILT_IN_MEMPCPY_CHKP: | |
929 | case BUILT_IN_MEMPCPY_CHK_CHKP: | |
930 | case BUILT_IN_MEMSET: | |
931 | case BUILT_IN_STPCPY: | |
932 | case BUILT_IN_STPCPY_CHK: | |
933 | case BUILT_IN_STPCPY_CHKP: | |
934 | case BUILT_IN_STPCPY_CHK_CHKP: | |
935 | case BUILT_IN_STRCAT: | |
936 | case BUILT_IN_STRCAT_CHK: | |
937 | case BUILT_IN_STRCAT_CHKP: | |
938 | case BUILT_IN_STRCAT_CHK_CHKP: | |
939 | case BUILT_IN_STRCPY: | |
940 | case BUILT_IN_STRCPY_CHK: | |
941 | case BUILT_IN_STRCPY_CHKP: | |
942 | case BUILT_IN_STRCPY_CHK_CHKP: | |
943 | /* The above functions should be neither const nor pure. Punt if they | |
944 | aren't. */ | |
945 | if (gimple_vdef (stmt) == NULL_TREE || gimple_vuse (stmt) == NULL_TREE) | |
946 | return false; | |
947 | break; | |
948 | ||
949 | default: | |
950 | break; | |
951 | } | |
952 | ||
953 | return true; | |
954 | } | |
955 | ||
8b57bfeb JJ |
956 | /* If the last .MEM setter statement before STMT is |
957 | memcpy (x, y, strlen (y) + 1), the only .MEM use of it is STMT | |
958 | and STMT is known to overwrite x[strlen (x)], adjust the last memcpy to | |
959 | just memcpy (x, y, strlen (y)). SI must be the zero length | |
960 | strinfo. */ | |
961 | ||
962 | static void | |
526ceb68 | 963 | adjust_last_stmt (strinfo *si, gimple *stmt, bool is_strcat) |
8b57bfeb JJ |
964 | { |
965 | tree vuse, callee, len; | |
966 | struct laststmt_struct last = laststmt; | |
526ceb68 | 967 | strinfo *lastsi, *firstsi; |
f5fc4a04 | 968 | unsigned len_arg_no = 2; |
8b57bfeb JJ |
969 | |
970 | laststmt.stmt = NULL; | |
971 | laststmt.len = NULL_TREE; | |
972 | laststmt.stridx = 0; | |
973 | ||
974 | if (last.stmt == NULL) | |
975 | return; | |
976 | ||
977 | vuse = gimple_vuse (stmt); | |
978 | if (vuse == NULL_TREE | |
979 | || SSA_NAME_DEF_STMT (vuse) != last.stmt | |
980 | || !has_single_use (vuse)) | |
981 | return; | |
982 | ||
983 | gcc_assert (last.stridx > 0); | |
984 | lastsi = get_strinfo (last.stridx); | |
985 | if (lastsi == NULL) | |
986 | return; | |
987 | ||
988 | if (lastsi != si) | |
989 | { | |
990 | if (lastsi->first == 0 || lastsi->first != si->first) | |
991 | return; | |
992 | ||
993 | firstsi = verify_related_strinfos (si); | |
994 | if (firstsi == NULL) | |
995 | return; | |
996 | while (firstsi != lastsi) | |
997 | { | |
526ceb68 | 998 | strinfo *nextsi; |
8b57bfeb JJ |
999 | if (firstsi->next == 0) |
1000 | return; | |
1001 | nextsi = get_strinfo (firstsi->next); | |
1002 | if (nextsi == NULL | |
1003 | || nextsi->prev != firstsi->idx | |
1004 | || nextsi->first != si->first) | |
1005 | return; | |
1006 | firstsi = nextsi; | |
1007 | } | |
1008 | } | |
1009 | ||
1010 | if (!is_strcat) | |
1011 | { | |
1012 | if (si->length == NULL_TREE || !integer_zerop (si->length)) | |
1013 | return; | |
1014 | } | |
1015 | ||
1016 | if (is_gimple_assign (last.stmt)) | |
1017 | { | |
1018 | gimple_stmt_iterator gsi; | |
1019 | ||
1020 | if (!integer_zerop (gimple_assign_rhs1 (last.stmt))) | |
1021 | return; | |
1022 | if (stmt_could_throw_p (last.stmt)) | |
1023 | return; | |
1024 | gsi = gsi_for_stmt (last.stmt); | |
1025 | unlink_stmt_vdef (last.stmt); | |
1026 | release_defs (last.stmt); | |
1027 | gsi_remove (&gsi, true); | |
1028 | return; | |
1029 | } | |
1030 | ||
0ad84f34 | 1031 | if (!valid_builtin_call (last.stmt)) |
8b57bfeb JJ |
1032 | return; |
1033 | ||
3626621a | 1034 | callee = gimple_call_fndecl (last.stmt); |
8b57bfeb JJ |
1035 | switch (DECL_FUNCTION_CODE (callee)) |
1036 | { | |
1037 | case BUILT_IN_MEMCPY: | |
1038 | case BUILT_IN_MEMCPY_CHK: | |
1039 | break; | |
f5fc4a04 IE |
1040 | case BUILT_IN_MEMCPY_CHKP: |
1041 | case BUILT_IN_MEMCPY_CHK_CHKP: | |
1042 | len_arg_no = 4; | |
1043 | break; | |
8b57bfeb JJ |
1044 | default: |
1045 | return; | |
1046 | } | |
1047 | ||
f5fc4a04 | 1048 | len = gimple_call_arg (last.stmt, len_arg_no); |
cc269bb6 | 1049 | if (tree_fits_uhwi_p (len)) |
8b57bfeb | 1050 | { |
cc269bb6 | 1051 | if (!tree_fits_uhwi_p (last.len) |
8b57bfeb | 1052 | || integer_zerop (len) |
7d362f6c | 1053 | || tree_to_uhwi (len) != tree_to_uhwi (last.len) + 1) |
8b57bfeb JJ |
1054 | return; |
1055 | /* Don't adjust the length if it is divisible by 4, it is more efficient | |
1056 | to store the extra '\0' in that case. */ | |
7d362f6c | 1057 | if ((tree_to_uhwi (len) & 3) == 0) |
8b57bfeb JJ |
1058 | return; |
1059 | } | |
1060 | else if (TREE_CODE (len) == SSA_NAME) | |
1061 | { | |
355fe088 | 1062 | gimple *def_stmt = SSA_NAME_DEF_STMT (len); |
8b57bfeb JJ |
1063 | if (!is_gimple_assign (def_stmt) |
1064 | || gimple_assign_rhs_code (def_stmt) != PLUS_EXPR | |
1065 | || gimple_assign_rhs1 (def_stmt) != last.len | |
1066 | || !integer_onep (gimple_assign_rhs2 (def_stmt))) | |
1067 | return; | |
1068 | } | |
1069 | else | |
1070 | return; | |
1071 | ||
f5fc4a04 | 1072 | gimple_call_set_arg (last.stmt, len_arg_no, last.len); |
8b57bfeb JJ |
1073 | update_stmt (last.stmt); |
1074 | } | |
1075 | ||
1076 | /* Handle a strlen call. If strlen of the argument is known, replace | |
1077 | the strlen call with the known value, otherwise remember that strlen | |
1078 | of the argument is stored in the lhs SSA_NAME. */ | |
1079 | ||
1080 | static void | |
1081 | handle_builtin_strlen (gimple_stmt_iterator *gsi) | |
1082 | { | |
1083 | int idx; | |
1084 | tree src; | |
355fe088 | 1085 | gimple *stmt = gsi_stmt (*gsi); |
8b57bfeb JJ |
1086 | tree lhs = gimple_call_lhs (stmt); |
1087 | ||
1088 | if (lhs == NULL_TREE) | |
1089 | return; | |
1090 | ||
1091 | src = gimple_call_arg (stmt, 0); | |
1092 | idx = get_stridx (src); | |
1093 | if (idx) | |
1094 | { | |
526ceb68 | 1095 | strinfo *si = NULL; |
8b57bfeb JJ |
1096 | tree rhs; |
1097 | ||
1098 | if (idx < 0) | |
1099 | rhs = build_int_cst (TREE_TYPE (lhs), ~idx); | |
1100 | else | |
1101 | { | |
1102 | rhs = NULL_TREE; | |
1103 | si = get_strinfo (idx); | |
1104 | if (si != NULL) | |
1105 | rhs = get_string_length (si); | |
1106 | } | |
1107 | if (rhs != NULL_TREE) | |
1108 | { | |
1109 | if (dump_file && (dump_flags & TDF_DETAILS) != 0) | |
1110 | { | |
1111 | fprintf (dump_file, "Optimizing: "); | |
1112 | print_gimple_stmt (dump_file, stmt, 0, TDF_SLIM); | |
1113 | } | |
1114 | rhs = unshare_expr (rhs); | |
1115 | if (!useless_type_conversion_p (TREE_TYPE (lhs), TREE_TYPE (rhs))) | |
1116 | rhs = fold_convert_loc (gimple_location (stmt), | |
1117 | TREE_TYPE (lhs), rhs); | |
1118 | if (!update_call_from_tree (gsi, rhs)) | |
1119 | gimplify_and_update_call_from_tree (gsi, rhs); | |
1120 | stmt = gsi_stmt (*gsi); | |
1121 | update_stmt (stmt); | |
1122 | if (dump_file && (dump_flags & TDF_DETAILS) != 0) | |
1123 | { | |
1124 | fprintf (dump_file, "into: "); | |
1125 | print_gimple_stmt (dump_file, stmt, 0, TDF_SLIM); | |
1126 | } | |
1127 | if (si != NULL | |
1128 | && TREE_CODE (si->length) != SSA_NAME | |
1129 | && TREE_CODE (si->length) != INTEGER_CST | |
1130 | && !SSA_NAME_OCCURS_IN_ABNORMAL_PHI (lhs)) | |
1131 | { | |
1132 | si = unshare_strinfo (si); | |
1133 | si->length = lhs; | |
1134 | } | |
1135 | return; | |
1136 | } | |
1137 | } | |
1138 | if (SSA_NAME_OCCURS_IN_ABNORMAL_PHI (lhs)) | |
1139 | return; | |
1140 | if (idx == 0) | |
1141 | idx = new_stridx (src); | |
1142 | else if (get_strinfo (idx) != NULL) | |
1143 | return; | |
1144 | if (idx) | |
1145 | { | |
526ceb68 | 1146 | strinfo *si = new_strinfo (src, idx, lhs); |
8b57bfeb JJ |
1147 | set_strinfo (idx, si); |
1148 | find_equal_ptrs (src, idx); | |
1149 | } | |
1150 | } | |
1151 | ||
1152 | /* Handle a strchr call. If strlen of the first argument is known, replace | |
1153 | the strchr (x, 0) call with the endptr or x + strlen, otherwise remember | |
1154 | that lhs of the call is endptr and strlen of the argument is endptr - x. */ | |
1155 | ||
1156 | static void | |
1157 | handle_builtin_strchr (gimple_stmt_iterator *gsi) | |
1158 | { | |
1159 | int idx; | |
1160 | tree src; | |
355fe088 | 1161 | gimple *stmt = gsi_stmt (*gsi); |
8b57bfeb | 1162 | tree lhs = gimple_call_lhs (stmt); |
f5fc4a04 | 1163 | bool with_bounds = gimple_call_with_bounds_p (stmt); |
8b57bfeb JJ |
1164 | |
1165 | if (lhs == NULL_TREE) | |
1166 | return; | |
1167 | ||
f5fc4a04 | 1168 | if (!integer_zerop (gimple_call_arg (stmt, with_bounds ? 2 : 1))) |
8b57bfeb JJ |
1169 | return; |
1170 | ||
1171 | src = gimple_call_arg (stmt, 0); | |
1172 | idx = get_stridx (src); | |
1173 | if (idx) | |
1174 | { | |
526ceb68 | 1175 | strinfo *si = NULL; |
8b57bfeb JJ |
1176 | tree rhs; |
1177 | ||
1178 | if (idx < 0) | |
1179 | rhs = build_int_cst (size_type_node, ~idx); | |
1180 | else | |
1181 | { | |
1182 | rhs = NULL_TREE; | |
1183 | si = get_strinfo (idx); | |
1184 | if (si != NULL) | |
1185 | rhs = get_string_length (si); | |
1186 | } | |
1187 | if (rhs != NULL_TREE) | |
1188 | { | |
1189 | location_t loc = gimple_location (stmt); | |
1190 | ||
1191 | if (dump_file && (dump_flags & TDF_DETAILS) != 0) | |
1192 | { | |
1193 | fprintf (dump_file, "Optimizing: "); | |
1194 | print_gimple_stmt (dump_file, stmt, 0, TDF_SLIM); | |
1195 | } | |
1196 | if (si != NULL && si->endptr != NULL_TREE) | |
1197 | { | |
1198 | rhs = unshare_expr (si->endptr); | |
1199 | if (!useless_type_conversion_p (TREE_TYPE (lhs), | |
1200 | TREE_TYPE (rhs))) | |
1201 | rhs = fold_convert_loc (loc, TREE_TYPE (lhs), rhs); | |
1202 | } | |
1203 | else | |
1204 | { | |
1205 | rhs = fold_convert_loc (loc, sizetype, unshare_expr (rhs)); | |
1206 | rhs = fold_build2_loc (loc, POINTER_PLUS_EXPR, | |
1207 | TREE_TYPE (src), src, rhs); | |
1208 | if (!useless_type_conversion_p (TREE_TYPE (lhs), | |
1209 | TREE_TYPE (rhs))) | |
1210 | rhs = fold_convert_loc (loc, TREE_TYPE (lhs), rhs); | |
1211 | } | |
1212 | if (!update_call_from_tree (gsi, rhs)) | |
1213 | gimplify_and_update_call_from_tree (gsi, rhs); | |
1214 | stmt = gsi_stmt (*gsi); | |
1215 | update_stmt (stmt); | |
1216 | if (dump_file && (dump_flags & TDF_DETAILS) != 0) | |
1217 | { | |
1218 | fprintf (dump_file, "into: "); | |
1219 | print_gimple_stmt (dump_file, stmt, 0, TDF_SLIM); | |
1220 | } | |
1221 | if (si != NULL | |
1222 | && si->endptr == NULL_TREE | |
1223 | && !SSA_NAME_OCCURS_IN_ABNORMAL_PHI (lhs)) | |
1224 | { | |
1225 | si = unshare_strinfo (si); | |
1226 | si->endptr = lhs; | |
1227 | } | |
1228 | zero_length_string (lhs, si); | |
1229 | return; | |
1230 | } | |
1231 | } | |
1232 | if (SSA_NAME_OCCURS_IN_ABNORMAL_PHI (lhs)) | |
1233 | return; | |
1234 | if (TREE_CODE (src) != SSA_NAME || !SSA_NAME_OCCURS_IN_ABNORMAL_PHI (src)) | |
1235 | { | |
1236 | if (idx == 0) | |
1237 | idx = new_stridx (src); | |
1238 | else if (get_strinfo (idx) != NULL) | |
1239 | { | |
1240 | zero_length_string (lhs, NULL); | |
1241 | return; | |
1242 | } | |
1243 | if (idx) | |
1244 | { | |
1245 | location_t loc = gimple_location (stmt); | |
1246 | tree lhsu = fold_convert_loc (loc, size_type_node, lhs); | |
1247 | tree srcu = fold_convert_loc (loc, size_type_node, src); | |
1248 | tree length = fold_build2_loc (loc, MINUS_EXPR, | |
1249 | size_type_node, lhsu, srcu); | |
526ceb68 | 1250 | strinfo *si = new_strinfo (src, idx, length); |
8b57bfeb JJ |
1251 | si->endptr = lhs; |
1252 | set_strinfo (idx, si); | |
1253 | find_equal_ptrs (src, idx); | |
1254 | zero_length_string (lhs, si); | |
1255 | } | |
1256 | } | |
1257 | else | |
1258 | zero_length_string (lhs, NULL); | |
1259 | } | |
1260 | ||
1261 | /* Handle a strcpy-like ({st{r,p}cpy,__st{r,p}cpy_chk}) call. | |
1262 | If strlen of the second argument is known, strlen of the first argument | |
1263 | is the same after this call. Furthermore, attempt to convert it to | |
1264 | memcpy. */ | |
1265 | ||
1266 | static void | |
1267 | handle_builtin_strcpy (enum built_in_function bcode, gimple_stmt_iterator *gsi) | |
1268 | { | |
1269 | int idx, didx; | |
1270 | tree src, dst, srclen, len, lhs, args, type, fn, oldlen; | |
1271 | bool success; | |
355fe088 | 1272 | gimple *stmt = gsi_stmt (*gsi); |
526ceb68 | 1273 | strinfo *si, *dsi, *olddsi, *zsi; |
8b57bfeb | 1274 | location_t loc; |
f5fc4a04 | 1275 | bool with_bounds = gimple_call_with_bounds_p (stmt); |
8b57bfeb | 1276 | |
f5fc4a04 | 1277 | src = gimple_call_arg (stmt, with_bounds ? 2 : 1); |
8b57bfeb JJ |
1278 | dst = gimple_call_arg (stmt, 0); |
1279 | lhs = gimple_call_lhs (stmt); | |
1280 | idx = get_stridx (src); | |
1281 | si = NULL; | |
1282 | if (idx > 0) | |
1283 | si = get_strinfo (idx); | |
1284 | ||
1285 | didx = get_stridx (dst); | |
1286 | olddsi = NULL; | |
1287 | oldlen = NULL_TREE; | |
1288 | if (didx > 0) | |
1289 | olddsi = get_strinfo (didx); | |
1290 | else if (didx < 0) | |
1291 | return; | |
1292 | ||
1293 | if (olddsi != NULL) | |
1294 | adjust_last_stmt (olddsi, stmt, false); | |
1295 | ||
1296 | srclen = NULL_TREE; | |
1297 | if (si != NULL) | |
1298 | srclen = get_string_length (si); | |
1299 | else if (idx < 0) | |
1300 | srclen = build_int_cst (size_type_node, ~idx); | |
1301 | ||
1302 | loc = gimple_location (stmt); | |
1303 | if (srclen == NULL_TREE) | |
1304 | switch (bcode) | |
1305 | { | |
1306 | case BUILT_IN_STRCPY: | |
1307 | case BUILT_IN_STRCPY_CHK: | |
f5fc4a04 IE |
1308 | case BUILT_IN_STRCPY_CHKP: |
1309 | case BUILT_IN_STRCPY_CHK_CHKP: | |
e79983f4 | 1310 | if (lhs != NULL_TREE || !builtin_decl_implicit_p (BUILT_IN_STPCPY)) |
8b57bfeb JJ |
1311 | return; |
1312 | break; | |
1313 | case BUILT_IN_STPCPY: | |
1314 | case BUILT_IN_STPCPY_CHK: | |
f5fc4a04 IE |
1315 | case BUILT_IN_STPCPY_CHKP: |
1316 | case BUILT_IN_STPCPY_CHK_CHKP: | |
8b57bfeb JJ |
1317 | if (lhs == NULL_TREE) |
1318 | return; | |
1319 | else | |
1320 | { | |
1321 | tree lhsuint = fold_convert_loc (loc, size_type_node, lhs); | |
1322 | srclen = fold_convert_loc (loc, size_type_node, dst); | |
1323 | srclen = fold_build2_loc (loc, MINUS_EXPR, size_type_node, | |
1324 | lhsuint, srclen); | |
1325 | } | |
1326 | break; | |
1327 | default: | |
1328 | gcc_unreachable (); | |
1329 | } | |
1330 | ||
1331 | if (didx == 0) | |
1332 | { | |
1333 | didx = new_stridx (dst); | |
1334 | if (didx == 0) | |
1335 | return; | |
1336 | } | |
1337 | if (olddsi != NULL) | |
1338 | { | |
1339 | oldlen = olddsi->length; | |
1340 | dsi = unshare_strinfo (olddsi); | |
1341 | dsi->length = srclen; | |
1342 | /* Break the chain, so adjust_related_strinfo on later pointers in | |
1343 | the chain won't adjust this one anymore. */ | |
1344 | dsi->next = 0; | |
1345 | dsi->stmt = NULL; | |
1346 | dsi->endptr = NULL_TREE; | |
1347 | } | |
1348 | else | |
1349 | { | |
1350 | dsi = new_strinfo (dst, didx, srclen); | |
1351 | set_strinfo (didx, dsi); | |
1352 | find_equal_ptrs (dst, didx); | |
1353 | } | |
1354 | dsi->writable = true; | |
1355 | dsi->dont_invalidate = true; | |
1356 | ||
1357 | if (dsi->length == NULL_TREE) | |
1358 | { | |
526ceb68 | 1359 | strinfo *chainsi; |
93a90db6 | 1360 | |
8b57bfeb JJ |
1361 | /* If string length of src is unknown, use delayed length |
1362 | computation. If string lenth of dst will be needed, it | |
1363 | can be computed by transforming this strcpy call into | |
1364 | stpcpy and subtracting dst from the return value. */ | |
93a90db6 AK |
1365 | |
1366 | /* Look for earlier strings whose length could be determined if | |
1367 | this strcpy is turned into an stpcpy. */ | |
1368 | ||
1369 | if (dsi->prev != 0 && (chainsi = verify_related_strinfos (dsi)) != NULL) | |
1370 | { | |
1371 | for (; chainsi && chainsi != dsi; chainsi = get_strinfo (chainsi->next)) | |
1372 | { | |
1373 | /* When setting a stmt for delayed length computation | |
1374 | prevent all strinfos through dsi from being | |
1375 | invalidated. */ | |
1376 | chainsi = unshare_strinfo (chainsi); | |
1377 | chainsi->stmt = stmt; | |
1378 | chainsi->length = NULL_TREE; | |
1379 | chainsi->endptr = NULL_TREE; | |
1380 | chainsi->dont_invalidate = true; | |
1381 | } | |
1382 | } | |
8b57bfeb JJ |
1383 | dsi->stmt = stmt; |
1384 | return; | |
1385 | } | |
1386 | ||
1387 | if (olddsi != NULL) | |
1388 | { | |
1389 | tree adj = NULL_TREE; | |
1390 | if (oldlen == NULL_TREE) | |
1391 | ; | |
1392 | else if (integer_zerop (oldlen)) | |
1393 | adj = srclen; | |
1394 | else if (TREE_CODE (oldlen) == INTEGER_CST | |
1395 | || TREE_CODE (srclen) == INTEGER_CST) | |
1396 | adj = fold_build2_loc (loc, MINUS_EXPR, | |
1397 | TREE_TYPE (srclen), srclen, | |
1398 | fold_convert_loc (loc, TREE_TYPE (srclen), | |
1399 | oldlen)); | |
1400 | if (adj != NULL_TREE) | |
1401 | adjust_related_strinfos (loc, dsi, adj); | |
1402 | else | |
1403 | dsi->prev = 0; | |
1404 | } | |
1405 | /* strcpy src may not overlap dst, so src doesn't need to be | |
1406 | invalidated either. */ | |
1407 | if (si != NULL) | |
1408 | si->dont_invalidate = true; | |
1409 | ||
1410 | fn = NULL_TREE; | |
1411 | zsi = NULL; | |
1412 | switch (bcode) | |
1413 | { | |
1414 | case BUILT_IN_STRCPY: | |
f5fc4a04 | 1415 | case BUILT_IN_STRCPY_CHKP: |
e79983f4 | 1416 | fn = builtin_decl_implicit (BUILT_IN_MEMCPY); |
8b57bfeb | 1417 | if (lhs) |
9771b263 | 1418 | ssa_ver_to_stridx[SSA_NAME_VERSION (lhs)] = didx; |
8b57bfeb JJ |
1419 | break; |
1420 | case BUILT_IN_STRCPY_CHK: | |
f5fc4a04 | 1421 | case BUILT_IN_STRCPY_CHK_CHKP: |
e79983f4 | 1422 | fn = builtin_decl_explicit (BUILT_IN_MEMCPY_CHK); |
8b57bfeb | 1423 | if (lhs) |
9771b263 | 1424 | ssa_ver_to_stridx[SSA_NAME_VERSION (lhs)] = didx; |
8b57bfeb JJ |
1425 | break; |
1426 | case BUILT_IN_STPCPY: | |
f5fc4a04 | 1427 | case BUILT_IN_STPCPY_CHKP: |
8b57bfeb JJ |
1428 | /* This would need adjustment of the lhs (subtract one), |
1429 | or detection that the trailing '\0' doesn't need to be | |
1430 | written, if it will be immediately overwritten. | |
e79983f4 | 1431 | fn = builtin_decl_explicit (BUILT_IN_MEMPCPY); */ |
8b57bfeb JJ |
1432 | if (lhs) |
1433 | { | |
1434 | dsi->endptr = lhs; | |
1435 | zsi = zero_length_string (lhs, dsi); | |
1436 | } | |
1437 | break; | |
1438 | case BUILT_IN_STPCPY_CHK: | |
f5fc4a04 | 1439 | case BUILT_IN_STPCPY_CHK_CHKP: |
8b57bfeb JJ |
1440 | /* This would need adjustment of the lhs (subtract one), |
1441 | or detection that the trailing '\0' doesn't need to be | |
1442 | written, if it will be immediately overwritten. | |
e79983f4 | 1443 | fn = builtin_decl_explicit (BUILT_IN_MEMPCPY_CHK); */ |
8b57bfeb JJ |
1444 | if (lhs) |
1445 | { | |
1446 | dsi->endptr = lhs; | |
1447 | zsi = zero_length_string (lhs, dsi); | |
1448 | } | |
1449 | break; | |
1450 | default: | |
1451 | gcc_unreachable (); | |
1452 | } | |
1453 | if (zsi != NULL) | |
1454 | zsi->dont_invalidate = true; | |
1455 | ||
1456 | if (fn == NULL_TREE) | |
1457 | return; | |
1458 | ||
1459 | args = TYPE_ARG_TYPES (TREE_TYPE (fn)); | |
1460 | type = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (args))); | |
1461 | ||
1462 | len = fold_convert_loc (loc, type, unshare_expr (srclen)); | |
1463 | len = fold_build2_loc (loc, PLUS_EXPR, type, len, build_int_cst (type, 1)); | |
1464 | len = force_gimple_operand_gsi (gsi, len, true, NULL_TREE, true, | |
1465 | GSI_SAME_STMT); | |
1466 | if (dump_file && (dump_flags & TDF_DETAILS) != 0) | |
1467 | { | |
1468 | fprintf (dump_file, "Optimizing: "); | |
1469 | print_gimple_stmt (dump_file, stmt, 0, TDF_SLIM); | |
1470 | } | |
f5fc4a04 IE |
1471 | if (with_bounds) |
1472 | { | |
1473 | fn = chkp_maybe_create_clone (fn)->decl; | |
1474 | if (gimple_call_num_args (stmt) == 4) | |
1475 | success = update_gimple_call (gsi, fn, 5, dst, | |
1476 | gimple_call_arg (stmt, 1), | |
1477 | src, | |
1478 | gimple_call_arg (stmt, 3), | |
1479 | len); | |
1480 | else | |
1481 | success = update_gimple_call (gsi, fn, 6, dst, | |
1482 | gimple_call_arg (stmt, 1), | |
1483 | src, | |
1484 | gimple_call_arg (stmt, 3), | |
1485 | len, | |
1486 | gimple_call_arg (stmt, 4)); | |
1487 | } | |
8b57bfeb | 1488 | else |
f5fc4a04 IE |
1489 | if (gimple_call_num_args (stmt) == 2) |
1490 | success = update_gimple_call (gsi, fn, 3, dst, src, len); | |
1491 | else | |
1492 | success = update_gimple_call (gsi, fn, 4, dst, src, len, | |
1493 | gimple_call_arg (stmt, 2)); | |
8b57bfeb JJ |
1494 | if (success) |
1495 | { | |
1496 | stmt = gsi_stmt (*gsi); | |
f5fc4a04 | 1497 | gimple_call_set_with_bounds (stmt, with_bounds); |
8b57bfeb JJ |
1498 | update_stmt (stmt); |
1499 | if (dump_file && (dump_flags & TDF_DETAILS) != 0) | |
1500 | { | |
1501 | fprintf (dump_file, "into: "); | |
1502 | print_gimple_stmt (dump_file, stmt, 0, TDF_SLIM); | |
1503 | } | |
1504 | /* Allow adjust_last_stmt to decrease this memcpy's size. */ | |
1505 | laststmt.stmt = stmt; | |
1506 | laststmt.len = srclen; | |
1507 | laststmt.stridx = dsi->idx; | |
1508 | } | |
1509 | else if (dump_file && (dump_flags & TDF_DETAILS) != 0) | |
1510 | fprintf (dump_file, "not possible.\n"); | |
1511 | } | |
1512 | ||
1513 | /* Handle a memcpy-like ({mem{,p}cpy,__mem{,p}cpy_chk}) call. | |
1514 | If strlen of the second argument is known and length of the third argument | |
1515 | is that plus one, strlen of the first argument is the same after this | |
1516 | call. */ | |
1517 | ||
1518 | static void | |
1519 | handle_builtin_memcpy (enum built_in_function bcode, gimple_stmt_iterator *gsi) | |
1520 | { | |
1521 | int idx, didx; | |
1522 | tree src, dst, len, lhs, oldlen, newlen; | |
355fe088 | 1523 | gimple *stmt = gsi_stmt (*gsi); |
526ceb68 | 1524 | strinfo *si, *dsi, *olddsi; |
f5fc4a04 | 1525 | bool with_bounds = gimple_call_with_bounds_p (stmt); |
8b57bfeb | 1526 | |
f5fc4a04 IE |
1527 | len = gimple_call_arg (stmt, with_bounds ? 4 : 2); |
1528 | src = gimple_call_arg (stmt, with_bounds ? 2 : 1); | |
8b57bfeb JJ |
1529 | dst = gimple_call_arg (stmt, 0); |
1530 | idx = get_stridx (src); | |
1531 | if (idx == 0) | |
1532 | return; | |
1533 | ||
1534 | didx = get_stridx (dst); | |
1535 | olddsi = NULL; | |
1536 | if (didx > 0) | |
1537 | olddsi = get_strinfo (didx); | |
1538 | else if (didx < 0) | |
1539 | return; | |
1540 | ||
1541 | if (olddsi != NULL | |
cc269bb6 | 1542 | && tree_fits_uhwi_p (len) |
8b57bfeb JJ |
1543 | && !integer_zerop (len)) |
1544 | adjust_last_stmt (olddsi, stmt, false); | |
1545 | ||
1546 | if (idx > 0) | |
1547 | { | |
355fe088 | 1548 | gimple *def_stmt; |
8b57bfeb JJ |
1549 | |
1550 | /* Handle memcpy (x, y, l) where l is strlen (y) + 1. */ | |
1551 | si = get_strinfo (idx); | |
1552 | if (si == NULL || si->length == NULL_TREE) | |
1553 | return; | |
1554 | if (TREE_CODE (len) != SSA_NAME) | |
1555 | return; | |
1556 | def_stmt = SSA_NAME_DEF_STMT (len); | |
1557 | if (!is_gimple_assign (def_stmt) | |
1558 | || gimple_assign_rhs_code (def_stmt) != PLUS_EXPR | |
1559 | || gimple_assign_rhs1 (def_stmt) != si->length | |
1560 | || !integer_onep (gimple_assign_rhs2 (def_stmt))) | |
1561 | return; | |
1562 | } | |
1563 | else | |
1564 | { | |
1565 | si = NULL; | |
1566 | /* Handle memcpy (x, "abcd", 5) or | |
1567 | memcpy (x, "abc\0uvw", 7). */ | |
cc269bb6 | 1568 | if (!tree_fits_uhwi_p (len) |
7d362f6c | 1569 | || tree_to_uhwi (len) <= (unsigned HOST_WIDE_INT) ~idx) |
8b57bfeb JJ |
1570 | return; |
1571 | } | |
1572 | ||
1573 | if (olddsi != NULL && TREE_CODE (len) == SSA_NAME) | |
1574 | adjust_last_stmt (olddsi, stmt, false); | |
1575 | ||
1576 | if (didx == 0) | |
1577 | { | |
1578 | didx = new_stridx (dst); | |
1579 | if (didx == 0) | |
1580 | return; | |
1581 | } | |
1582 | if (si != NULL) | |
1583 | newlen = si->length; | |
1584 | else | |
80642376 | 1585 | newlen = build_int_cst (size_type_node, ~idx); |
8b57bfeb JJ |
1586 | oldlen = NULL_TREE; |
1587 | if (olddsi != NULL) | |
1588 | { | |
1589 | dsi = unshare_strinfo (olddsi); | |
1590 | oldlen = olddsi->length; | |
1591 | dsi->length = newlen; | |
1592 | /* Break the chain, so adjust_related_strinfo on later pointers in | |
1593 | the chain won't adjust this one anymore. */ | |
1594 | dsi->next = 0; | |
1595 | dsi->stmt = NULL; | |
1596 | dsi->endptr = NULL_TREE; | |
1597 | } | |
1598 | else | |
1599 | { | |
1600 | dsi = new_strinfo (dst, didx, newlen); | |
1601 | set_strinfo (didx, dsi); | |
1602 | find_equal_ptrs (dst, didx); | |
1603 | } | |
1604 | dsi->writable = true; | |
1605 | dsi->dont_invalidate = true; | |
1606 | if (olddsi != NULL) | |
1607 | { | |
1608 | tree adj = NULL_TREE; | |
1609 | location_t loc = gimple_location (stmt); | |
1610 | if (oldlen == NULL_TREE) | |
1611 | ; | |
1612 | else if (integer_zerop (oldlen)) | |
1613 | adj = dsi->length; | |
1614 | else if (TREE_CODE (oldlen) == INTEGER_CST | |
1615 | || TREE_CODE (dsi->length) == INTEGER_CST) | |
1616 | adj = fold_build2_loc (loc, MINUS_EXPR, | |
1617 | TREE_TYPE (dsi->length), dsi->length, | |
1618 | fold_convert_loc (loc, TREE_TYPE (dsi->length), | |
1619 | oldlen)); | |
1620 | if (adj != NULL_TREE) | |
1621 | adjust_related_strinfos (loc, dsi, adj); | |
1622 | else | |
1623 | dsi->prev = 0; | |
1624 | } | |
1625 | /* memcpy src may not overlap dst, so src doesn't need to be | |
1626 | invalidated either. */ | |
1627 | if (si != NULL) | |
1628 | si->dont_invalidate = true; | |
1629 | ||
1630 | lhs = gimple_call_lhs (stmt); | |
1631 | switch (bcode) | |
1632 | { | |
1633 | case BUILT_IN_MEMCPY: | |
1634 | case BUILT_IN_MEMCPY_CHK: | |
f5fc4a04 IE |
1635 | case BUILT_IN_MEMCPY_CHKP: |
1636 | case BUILT_IN_MEMCPY_CHK_CHKP: | |
8b57bfeb JJ |
1637 | /* Allow adjust_last_stmt to decrease this memcpy's size. */ |
1638 | laststmt.stmt = stmt; | |
1639 | laststmt.len = dsi->length; | |
1640 | laststmt.stridx = dsi->idx; | |
1641 | if (lhs) | |
9771b263 | 1642 | ssa_ver_to_stridx[SSA_NAME_VERSION (lhs)] = didx; |
8b57bfeb JJ |
1643 | break; |
1644 | case BUILT_IN_MEMPCPY: | |
1645 | case BUILT_IN_MEMPCPY_CHK: | |
f5fc4a04 IE |
1646 | case BUILT_IN_MEMPCPY_CHKP: |
1647 | case BUILT_IN_MEMPCPY_CHK_CHKP: | |
8b57bfeb JJ |
1648 | break; |
1649 | default: | |
1650 | gcc_unreachable (); | |
1651 | } | |
1652 | } | |
1653 | ||
1654 | /* Handle a strcat-like ({strcat,__strcat_chk}) call. | |
1655 | If strlen of the second argument is known, strlen of the first argument | |
1656 | is increased by the length of the second argument. Furthermore, attempt | |
1657 | to convert it to memcpy/strcpy if the length of the first argument | |
1658 | is known. */ | |
1659 | ||
1660 | static void | |
1661 | handle_builtin_strcat (enum built_in_function bcode, gimple_stmt_iterator *gsi) | |
1662 | { | |
1663 | int idx, didx; | |
1664 | tree src, dst, srclen, dstlen, len, lhs, args, type, fn, objsz, endptr; | |
1665 | bool success; | |
355fe088 | 1666 | gimple *stmt = gsi_stmt (*gsi); |
526ceb68 | 1667 | strinfo *si, *dsi; |
8b57bfeb | 1668 | location_t loc; |
f5fc4a04 | 1669 | bool with_bounds = gimple_call_with_bounds_p (stmt); |
8b57bfeb | 1670 | |
f5fc4a04 | 1671 | src = gimple_call_arg (stmt, with_bounds ? 2 : 1); |
8b57bfeb JJ |
1672 | dst = gimple_call_arg (stmt, 0); |
1673 | lhs = gimple_call_lhs (stmt); | |
1674 | ||
1675 | didx = get_stridx (dst); | |
1676 | if (didx < 0) | |
1677 | return; | |
1678 | ||
1679 | dsi = NULL; | |
1680 | if (didx > 0) | |
1681 | dsi = get_strinfo (didx); | |
1682 | if (dsi == NULL || get_string_length (dsi) == NULL_TREE) | |
1683 | { | |
1684 | /* strcat (p, q) can be transformed into | |
1685 | tmp = p + strlen (p); endptr = strpcpy (tmp, q); | |
1686 | with length endptr - p if we need to compute the length | |
1687 | later on. Don't do this transformation if we don't need | |
1688 | it. */ | |
e79983f4 | 1689 | if (builtin_decl_implicit_p (BUILT_IN_STPCPY) && lhs == NULL_TREE) |
8b57bfeb JJ |
1690 | { |
1691 | if (didx == 0) | |
1692 | { | |
1693 | didx = new_stridx (dst); | |
1694 | if (didx == 0) | |
1695 | return; | |
1696 | } | |
1697 | if (dsi == NULL) | |
1698 | { | |
1699 | dsi = new_strinfo (dst, didx, NULL_TREE); | |
1700 | set_strinfo (didx, dsi); | |
1701 | find_equal_ptrs (dst, didx); | |
1702 | } | |
1703 | else | |
1704 | { | |
1705 | dsi = unshare_strinfo (dsi); | |
1706 | dsi->length = NULL_TREE; | |
1707 | dsi->next = 0; | |
1708 | dsi->endptr = NULL_TREE; | |
1709 | } | |
1710 | dsi->writable = true; | |
1711 | dsi->stmt = stmt; | |
1712 | dsi->dont_invalidate = true; | |
1713 | } | |
1714 | return; | |
1715 | } | |
1716 | ||
1717 | srclen = NULL_TREE; | |
1718 | si = NULL; | |
1719 | idx = get_stridx (src); | |
1720 | if (idx < 0) | |
1721 | srclen = build_int_cst (size_type_node, ~idx); | |
1722 | else if (idx > 0) | |
1723 | { | |
1724 | si = get_strinfo (idx); | |
1725 | if (si != NULL) | |
1726 | srclen = get_string_length (si); | |
1727 | } | |
1728 | ||
1729 | loc = gimple_location (stmt); | |
1730 | dstlen = dsi->length; | |
1731 | endptr = dsi->endptr; | |
1732 | ||
1733 | dsi = unshare_strinfo (dsi); | |
1734 | dsi->endptr = NULL_TREE; | |
1735 | dsi->stmt = NULL; | |
1736 | dsi->writable = true; | |
1737 | ||
1738 | if (srclen != NULL_TREE) | |
1739 | { | |
1740 | dsi->length = fold_build2_loc (loc, PLUS_EXPR, TREE_TYPE (dsi->length), | |
1741 | dsi->length, srclen); | |
1742 | adjust_related_strinfos (loc, dsi, srclen); | |
1743 | dsi->dont_invalidate = true; | |
1744 | } | |
1745 | else | |
1746 | { | |
1747 | dsi->length = NULL; | |
e79983f4 | 1748 | if (lhs == NULL_TREE && builtin_decl_implicit_p (BUILT_IN_STPCPY)) |
8b57bfeb JJ |
1749 | dsi->dont_invalidate = true; |
1750 | } | |
1751 | ||
1752 | if (si != NULL) | |
1753 | /* strcat src may not overlap dst, so src doesn't need to be | |
1754 | invalidated either. */ | |
1755 | si->dont_invalidate = true; | |
1756 | ||
1757 | /* For now. Could remove the lhs from the call and add | |
1758 | lhs = dst; afterwards. */ | |
1759 | if (lhs) | |
1760 | return; | |
1761 | ||
1762 | fn = NULL_TREE; | |
1763 | objsz = NULL_TREE; | |
1764 | switch (bcode) | |
1765 | { | |
1766 | case BUILT_IN_STRCAT: | |
f5fc4a04 | 1767 | case BUILT_IN_STRCAT_CHKP: |
8b57bfeb | 1768 | if (srclen != NULL_TREE) |
e79983f4 | 1769 | fn = builtin_decl_implicit (BUILT_IN_MEMCPY); |
8b57bfeb | 1770 | else |
e79983f4 | 1771 | fn = builtin_decl_implicit (BUILT_IN_STRCPY); |
8b57bfeb JJ |
1772 | break; |
1773 | case BUILT_IN_STRCAT_CHK: | |
f5fc4a04 | 1774 | case BUILT_IN_STRCAT_CHK_CHKP: |
8b57bfeb | 1775 | if (srclen != NULL_TREE) |
e79983f4 | 1776 | fn = builtin_decl_explicit (BUILT_IN_MEMCPY_CHK); |
8b57bfeb | 1777 | else |
e79983f4 | 1778 | fn = builtin_decl_explicit (BUILT_IN_STRCPY_CHK); |
f5fc4a04 | 1779 | objsz = gimple_call_arg (stmt, with_bounds ? 4 : 2); |
8b57bfeb JJ |
1780 | break; |
1781 | default: | |
1782 | gcc_unreachable (); | |
1783 | } | |
1784 | ||
1785 | if (fn == NULL_TREE) | |
1786 | return; | |
1787 | ||
1788 | len = NULL_TREE; | |
1789 | if (srclen != NULL_TREE) | |
1790 | { | |
1791 | args = TYPE_ARG_TYPES (TREE_TYPE (fn)); | |
1792 | type = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (args))); | |
1793 | ||
1794 | len = fold_convert_loc (loc, type, unshare_expr (srclen)); | |
1795 | len = fold_build2_loc (loc, PLUS_EXPR, type, len, | |
1796 | build_int_cst (type, 1)); | |
1797 | len = force_gimple_operand_gsi (gsi, len, true, NULL_TREE, true, | |
1798 | GSI_SAME_STMT); | |
1799 | } | |
1800 | if (endptr) | |
1801 | dst = fold_convert_loc (loc, TREE_TYPE (dst), unshare_expr (endptr)); | |
1802 | else | |
1803 | dst = fold_build2_loc (loc, POINTER_PLUS_EXPR, | |
1804 | TREE_TYPE (dst), unshare_expr (dst), | |
1805 | fold_convert_loc (loc, sizetype, | |
1806 | unshare_expr (dstlen))); | |
1807 | dst = force_gimple_operand_gsi (gsi, dst, true, NULL_TREE, true, | |
1808 | GSI_SAME_STMT); | |
1809 | if (dump_file && (dump_flags & TDF_DETAILS) != 0) | |
1810 | { | |
1811 | fprintf (dump_file, "Optimizing: "); | |
1812 | print_gimple_stmt (dump_file, stmt, 0, TDF_SLIM); | |
1813 | } | |
f5fc4a04 IE |
1814 | if (with_bounds) |
1815 | { | |
1816 | fn = chkp_maybe_create_clone (fn)->decl; | |
1817 | if (srclen != NULL_TREE) | |
1818 | success = update_gimple_call (gsi, fn, 5 + (objsz != NULL_TREE), | |
1819 | dst, | |
1820 | gimple_call_arg (stmt, 1), | |
1821 | src, | |
1822 | gimple_call_arg (stmt, 3), | |
1823 | len, objsz); | |
1824 | else | |
1825 | success = update_gimple_call (gsi, fn, 4 + (objsz != NULL_TREE), | |
1826 | dst, | |
1827 | gimple_call_arg (stmt, 1), | |
1828 | src, | |
1829 | gimple_call_arg (stmt, 3), | |
1830 | objsz); | |
1831 | } | |
8b57bfeb | 1832 | else |
f5fc4a04 IE |
1833 | if (srclen != NULL_TREE) |
1834 | success = update_gimple_call (gsi, fn, 3 + (objsz != NULL_TREE), | |
1835 | dst, src, len, objsz); | |
1836 | else | |
1837 | success = update_gimple_call (gsi, fn, 2 + (objsz != NULL_TREE), | |
1838 | dst, src, objsz); | |
8b57bfeb JJ |
1839 | if (success) |
1840 | { | |
1841 | stmt = gsi_stmt (*gsi); | |
f5fc4a04 | 1842 | gimple_call_set_with_bounds (stmt, with_bounds); |
8b57bfeb JJ |
1843 | update_stmt (stmt); |
1844 | if (dump_file && (dump_flags & TDF_DETAILS) != 0) | |
1845 | { | |
1846 | fprintf (dump_file, "into: "); | |
1847 | print_gimple_stmt (dump_file, stmt, 0, TDF_SLIM); | |
1848 | } | |
1849 | /* If srclen == NULL, note that current string length can be | |
1850 | computed by transforming this strcpy into stpcpy. */ | |
1851 | if (srclen == NULL_TREE && dsi->dont_invalidate) | |
1852 | dsi->stmt = stmt; | |
1853 | adjust_last_stmt (dsi, stmt, true); | |
1854 | if (srclen != NULL_TREE) | |
1855 | { | |
1856 | laststmt.stmt = stmt; | |
1857 | laststmt.len = srclen; | |
1858 | laststmt.stridx = dsi->idx; | |
1859 | } | |
1860 | } | |
1861 | else if (dump_file && (dump_flags & TDF_DETAILS) != 0) | |
1862 | fprintf (dump_file, "not possible.\n"); | |
1863 | } | |
1864 | ||
24314386 MG |
1865 | /* Handle a call to malloc or calloc. */ |
1866 | ||
1867 | static void | |
1868 | handle_builtin_malloc (enum built_in_function bcode, gimple_stmt_iterator *gsi) | |
1869 | { | |
355fe088 | 1870 | gimple *stmt = gsi_stmt (*gsi); |
24314386 MG |
1871 | tree lhs = gimple_call_lhs (stmt); |
1872 | gcc_assert (get_stridx (lhs) == 0); | |
1873 | int idx = new_stridx (lhs); | |
1874 | tree length = NULL_TREE; | |
1875 | if (bcode == BUILT_IN_CALLOC) | |
1876 | length = build_int_cst (size_type_node, 0); | |
526ceb68 | 1877 | strinfo *si = new_strinfo (lhs, idx, length); |
24314386 MG |
1878 | if (bcode == BUILT_IN_CALLOC) |
1879 | si->endptr = lhs; | |
1880 | set_strinfo (idx, si); | |
1881 | si->writable = true; | |
1882 | si->stmt = stmt; | |
1883 | si->dont_invalidate = true; | |
1884 | } | |
1885 | ||
1886 | /* Handle a call to memset. | |
1887 | After a call to calloc, memset(,0,) is unnecessary. | |
1888 | memset(malloc(n),0,n) is calloc(n,1). */ | |
1889 | ||
1890 | static bool | |
1891 | handle_builtin_memset (gimple_stmt_iterator *gsi) | |
1892 | { | |
355fe088 | 1893 | gimple *stmt2 = gsi_stmt (*gsi); |
24314386 MG |
1894 | if (!integer_zerop (gimple_call_arg (stmt2, 1))) |
1895 | return true; | |
1896 | tree ptr = gimple_call_arg (stmt2, 0); | |
1897 | int idx1 = get_stridx (ptr); | |
1898 | if (idx1 <= 0) | |
1899 | return true; | |
526ceb68 | 1900 | strinfo *si1 = get_strinfo (idx1); |
24314386 MG |
1901 | if (!si1) |
1902 | return true; | |
355fe088 | 1903 | gimple *stmt1 = si1->stmt; |
24314386 MG |
1904 | if (!stmt1 || !is_gimple_call (stmt1)) |
1905 | return true; | |
1906 | tree callee1 = gimple_call_fndecl (stmt1); | |
0ad84f34 | 1907 | if (!valid_builtin_call (stmt1)) |
24314386 MG |
1908 | return true; |
1909 | enum built_in_function code1 = DECL_FUNCTION_CODE (callee1); | |
1910 | tree size = gimple_call_arg (stmt2, 2); | |
1911 | if (code1 == BUILT_IN_CALLOC) | |
1912 | /* Not touching stmt1 */ ; | |
1913 | else if (code1 == BUILT_IN_MALLOC | |
1914 | && operand_equal_p (gimple_call_arg (stmt1, 0), size, 0)) | |
1915 | { | |
1916 | gimple_stmt_iterator gsi1 = gsi_for_stmt (stmt1); | |
1917 | update_gimple_call (&gsi1, builtin_decl_implicit (BUILT_IN_CALLOC), 2, | |
1918 | size, build_one_cst (size_type_node)); | |
20cb2258 MG |
1919 | si1->length = build_int_cst (size_type_node, 0); |
1920 | si1->stmt = gsi_stmt (gsi1); | |
24314386 MG |
1921 | } |
1922 | else | |
1923 | return true; | |
1924 | tree lhs = gimple_call_lhs (stmt2); | |
1925 | unlink_stmt_vdef (stmt2); | |
1926 | if (lhs) | |
1927 | { | |
355fe088 | 1928 | gimple *assign = gimple_build_assign (lhs, ptr); |
24314386 MG |
1929 | gsi_replace (gsi, assign, false); |
1930 | } | |
1931 | else | |
1932 | { | |
1933 | gsi_remove (gsi, true); | |
1934 | release_defs (stmt2); | |
1935 | } | |
1936 | ||
1937 | return false; | |
1938 | } | |
1939 | ||
36b85e43 BS |
1940 | /* Handle a call to memcmp. We try to handle small comparisons by |
1941 | converting them to load and compare, and replacing the call to memcmp | |
1942 | with a __builtin_memcmp_eq call where possible. */ | |
1943 | ||
1944 | static bool | |
1945 | handle_builtin_memcmp (gimple_stmt_iterator *gsi) | |
1946 | { | |
1947 | gcall *stmt2 = as_a <gcall *> (gsi_stmt (*gsi)); | |
1948 | tree res = gimple_call_lhs (stmt2); | |
1949 | tree arg1 = gimple_call_arg (stmt2, 0); | |
1950 | tree arg2 = gimple_call_arg (stmt2, 1); | |
1951 | tree len = gimple_call_arg (stmt2, 2); | |
1952 | unsigned HOST_WIDE_INT leni; | |
1953 | use_operand_p use_p; | |
1954 | imm_use_iterator iter; | |
1955 | ||
1956 | if (!res) | |
1957 | return true; | |
1958 | ||
1959 | FOR_EACH_IMM_USE_FAST (use_p, iter, res) | |
1960 | { | |
1961 | gimple *ustmt = USE_STMT (use_p); | |
1962 | ||
73d73b48 BS |
1963 | if (is_gimple_debug (ustmt)) |
1964 | continue; | |
36b85e43 BS |
1965 | if (gimple_code (ustmt) == GIMPLE_ASSIGN) |
1966 | { | |
1967 | gassign *asgn = as_a <gassign *> (ustmt); | |
1968 | tree_code code = gimple_assign_rhs_code (asgn); | |
1969 | if ((code != EQ_EXPR && code != NE_EXPR) | |
1970 | || !integer_zerop (gimple_assign_rhs2 (asgn))) | |
1971 | return true; | |
1972 | } | |
1973 | else if (gimple_code (ustmt) == GIMPLE_COND) | |
1974 | { | |
1975 | tree_code code = gimple_cond_code (ustmt); | |
1976 | if ((code != EQ_EXPR && code != NE_EXPR) | |
1977 | || !integer_zerop (gimple_cond_rhs (ustmt))) | |
1978 | return true; | |
1979 | } | |
1980 | else | |
1981 | return true; | |
1982 | } | |
1983 | ||
1984 | if (tree_fits_uhwi_p (len) | |
1985 | && (leni = tree_to_uhwi (len)) <= GET_MODE_SIZE (word_mode) | |
146ec50f | 1986 | && pow2p_hwi (leni)) |
36b85e43 BS |
1987 | { |
1988 | leni *= CHAR_TYPE_SIZE; | |
1989 | unsigned align1 = get_pointer_alignment (arg1); | |
1990 | unsigned align2 = get_pointer_alignment (arg2); | |
1991 | unsigned align = MIN (align1, align2); | |
1992 | machine_mode mode = mode_for_size (leni, MODE_INT, 1); | |
1993 | if (mode != BLKmode | |
1994 | && (align >= leni || !SLOW_UNALIGNED_ACCESS (mode, align))) | |
1995 | { | |
1996 | location_t loc = gimple_location (stmt2); | |
1997 | tree type, off; | |
1998 | type = build_nonstandard_integer_type (leni, 1); | |
1999 | gcc_assert (GET_MODE_BITSIZE (TYPE_MODE (type)) == leni); | |
2000 | tree ptrtype = build_pointer_type_for_mode (char_type_node, | |
2001 | ptr_mode, true); | |
2002 | off = build_int_cst (ptrtype, 0); | |
2003 | arg1 = build2_loc (loc, MEM_REF, type, arg1, off); | |
2004 | arg2 = build2_loc (loc, MEM_REF, type, arg2, off); | |
2005 | tree tem1 = fold_const_aggregate_ref (arg1); | |
2006 | if (tem1) | |
2007 | arg1 = tem1; | |
2008 | tree tem2 = fold_const_aggregate_ref (arg2); | |
2009 | if (tem2) | |
2010 | arg2 = tem2; | |
2011 | res = fold_convert_loc (loc, TREE_TYPE (res), | |
2012 | fold_build2_loc (loc, NE_EXPR, | |
2013 | boolean_type_node, | |
2014 | arg1, arg2)); | |
2015 | gimplify_and_update_call_from_tree (gsi, res); | |
2016 | return false; | |
2017 | } | |
2018 | } | |
2019 | ||
2020 | gimple_call_set_fndecl (stmt2, builtin_decl_explicit (BUILT_IN_MEMCMP_EQ)); | |
2021 | return false; | |
2022 | } | |
2023 | ||
8b57bfeb JJ |
2024 | /* Handle a POINTER_PLUS_EXPR statement. |
2025 | For p = "abcd" + 2; compute associated length, or if | |
2026 | p = q + off is pointing to a '\0' character of a string, call | |
2027 | zero_length_string on it. */ | |
2028 | ||
2029 | static void | |
2030 | handle_pointer_plus (gimple_stmt_iterator *gsi) | |
2031 | { | |
355fe088 | 2032 | gimple *stmt = gsi_stmt (*gsi); |
8b57bfeb JJ |
2033 | tree lhs = gimple_assign_lhs (stmt), off; |
2034 | int idx = get_stridx (gimple_assign_rhs1 (stmt)); | |
526ceb68 | 2035 | strinfo *si, *zsi; |
8b57bfeb JJ |
2036 | |
2037 | if (idx == 0) | |
2038 | return; | |
2039 | ||
2040 | if (idx < 0) | |
2041 | { | |
2042 | tree off = gimple_assign_rhs2 (stmt); | |
cc269bb6 | 2043 | if (tree_fits_uhwi_p (off) |
7d362f6c | 2044 | && tree_to_uhwi (off) <= (unsigned HOST_WIDE_INT) ~idx) |
9771b263 | 2045 | ssa_ver_to_stridx[SSA_NAME_VERSION (lhs)] |
ae7e9ddd | 2046 | = ~(~idx - (int) tree_to_uhwi (off)); |
8b57bfeb JJ |
2047 | return; |
2048 | } | |
2049 | ||
2050 | si = get_strinfo (idx); | |
2051 | if (si == NULL || si->length == NULL_TREE) | |
2052 | return; | |
2053 | ||
2054 | off = gimple_assign_rhs2 (stmt); | |
2055 | zsi = NULL; | |
2056 | if (operand_equal_p (si->length, off, 0)) | |
2057 | zsi = zero_length_string (lhs, si); | |
2058 | else if (TREE_CODE (off) == SSA_NAME) | |
2059 | { | |
355fe088 | 2060 | gimple *def_stmt = SSA_NAME_DEF_STMT (off); |
8b57bfeb JJ |
2061 | if (gimple_assign_single_p (def_stmt) |
2062 | && operand_equal_p (si->length, gimple_assign_rhs1 (def_stmt), 0)) | |
2063 | zsi = zero_length_string (lhs, si); | |
2064 | } | |
2065 | if (zsi != NULL | |
2066 | && si->endptr != NULL_TREE | |
2067 | && si->endptr != lhs | |
2068 | && TREE_CODE (si->endptr) == SSA_NAME) | |
2069 | { | |
2070 | enum tree_code rhs_code | |
2071 | = useless_type_conversion_p (TREE_TYPE (lhs), TREE_TYPE (si->endptr)) | |
2072 | ? SSA_NAME : NOP_EXPR; | |
00d66391 | 2073 | gimple_assign_set_rhs_with_ops (gsi, rhs_code, si->endptr); |
8b57bfeb JJ |
2074 | gcc_assert (gsi_stmt (*gsi) == stmt); |
2075 | update_stmt (stmt); | |
2076 | } | |
2077 | } | |
2078 | ||
2079 | /* Handle a single character store. */ | |
2080 | ||
2081 | static bool | |
2082 | handle_char_store (gimple_stmt_iterator *gsi) | |
2083 | { | |
2084 | int idx = -1; | |
526ceb68 | 2085 | strinfo *si = NULL; |
355fe088 | 2086 | gimple *stmt = gsi_stmt (*gsi); |
8b57bfeb JJ |
2087 | tree ssaname = NULL_TREE, lhs = gimple_assign_lhs (stmt); |
2088 | ||
2089 | if (TREE_CODE (lhs) == MEM_REF | |
2090 | && TREE_CODE (TREE_OPERAND (lhs, 0)) == SSA_NAME) | |
2091 | { | |
2092 | if (integer_zerop (TREE_OPERAND (lhs, 1))) | |
2093 | { | |
2094 | ssaname = TREE_OPERAND (lhs, 0); | |
2095 | idx = get_stridx (ssaname); | |
2096 | } | |
2097 | } | |
2098 | else | |
5f3cd7c3 | 2099 | idx = get_addr_stridx (lhs, NULL_TREE); |
8b57bfeb JJ |
2100 | |
2101 | if (idx > 0) | |
2102 | { | |
2103 | si = get_strinfo (idx); | |
2104 | if (si != NULL && si->length != NULL_TREE && integer_zerop (si->length)) | |
2105 | { | |
2106 | if (initializer_zerop (gimple_assign_rhs1 (stmt))) | |
2107 | { | |
2108 | /* When storing '\0', the store can be removed | |
2109 | if we know it has been stored in the current function. */ | |
2110 | if (!stmt_could_throw_p (stmt) && si->writable) | |
2111 | { | |
2112 | unlink_stmt_vdef (stmt); | |
2113 | release_defs (stmt); | |
2114 | gsi_remove (gsi, true); | |
2115 | return false; | |
2116 | } | |
2117 | else | |
2118 | { | |
2119 | si->writable = true; | |
5b115c1f MP |
2120 | gsi_next (gsi); |
2121 | return false; | |
8b57bfeb JJ |
2122 | } |
2123 | } | |
2124 | else | |
2125 | /* Otherwise this statement overwrites the '\0' with | |
2126 | something, if the previous stmt was a memcpy, | |
2127 | its length may be decreased. */ | |
2128 | adjust_last_stmt (si, stmt, false); | |
2129 | } | |
3a60f32b | 2130 | else if (si != NULL && integer_zerop (gimple_assign_rhs1 (stmt))) |
8b57bfeb JJ |
2131 | { |
2132 | si = unshare_strinfo (si); | |
2133 | si->length = build_int_cst (size_type_node, 0); | |
2134 | si->endptr = NULL; | |
2135 | si->prev = 0; | |
2136 | si->next = 0; | |
2137 | si->stmt = NULL; | |
2138 | si->first = 0; | |
2139 | si->writable = true; | |
2140 | if (ssaname && !SSA_NAME_OCCURS_IN_ABNORMAL_PHI (ssaname)) | |
2141 | si->endptr = ssaname; | |
2142 | si->dont_invalidate = true; | |
2143 | } | |
5b115c1f MP |
2144 | /* If si->length is non-zero constant, we aren't overwriting '\0', |
2145 | and if we aren't storing '\0', we know that the length of the | |
2146 | string and any other zero terminated string in memory remains | |
2147 | the same. In that case we move to the next gimple statement and | |
2148 | return to signal the caller that it shouldn't invalidate anything. | |
2149 | ||
2150 | This is benefical for cases like: | |
2151 | ||
2152 | char p[20]; | |
2153 | void foo (char *q) | |
2154 | { | |
2155 | strcpy (p, "foobar"); | |
2156 | size_t len = strlen (p); // This can be optimized into 6 | |
2157 | size_t len2 = strlen (q); // This has to be computed | |
2158 | p[0] = 'X'; | |
2159 | size_t len3 = strlen (p); // This can be optimized into 6 | |
2160 | size_t len4 = strlen (q); // This can be optimized into len2 | |
2161 | bar (len, len2, len3, len4); | |
2162 | } | |
2163 | */ | |
2164 | else if (si != NULL && si->length != NULL_TREE | |
2165 | && TREE_CODE (si->length) == INTEGER_CST | |
2166 | && integer_nonzerop (gimple_assign_rhs1 (stmt))) | |
2167 | { | |
2168 | gsi_next (gsi); | |
2169 | return false; | |
2170 | } | |
8b57bfeb JJ |
2171 | } |
2172 | else if (idx == 0 && initializer_zerop (gimple_assign_rhs1 (stmt))) | |
2173 | { | |
2174 | if (ssaname) | |
2175 | { | |
2176 | si = zero_length_string (ssaname, NULL); | |
2177 | if (si != NULL) | |
2178 | si->dont_invalidate = true; | |
2179 | } | |
2180 | else | |
2181 | { | |
2182 | int idx = new_addr_stridx (lhs); | |
2183 | if (idx != 0) | |
2184 | { | |
2185 | si = new_strinfo (build_fold_addr_expr (lhs), idx, | |
2186 | build_int_cst (size_type_node, 0)); | |
2187 | set_strinfo (idx, si); | |
2188 | si->dont_invalidate = true; | |
2189 | } | |
2190 | } | |
2191 | if (si != NULL) | |
2192 | si->writable = true; | |
2193 | } | |
198fe1bf JJ |
2194 | else if (idx == 0 |
2195 | && TREE_CODE (gimple_assign_rhs1 (stmt)) == STRING_CST | |
2196 | && ssaname == NULL_TREE | |
2197 | && TREE_CODE (TREE_TYPE (lhs)) == ARRAY_TYPE) | |
2198 | { | |
2199 | size_t l = strlen (TREE_STRING_POINTER (gimple_assign_rhs1 (stmt))); | |
2200 | HOST_WIDE_INT a = int_size_in_bytes (TREE_TYPE (lhs)); | |
2201 | if (a > 0 && (unsigned HOST_WIDE_INT) a > l) | |
2202 | { | |
2203 | int idx = new_addr_stridx (lhs); | |
2204 | if (idx != 0) | |
2205 | { | |
2206 | si = new_strinfo (build_fold_addr_expr (lhs), idx, | |
2207 | build_int_cst (size_type_node, l)); | |
2208 | set_strinfo (idx, si); | |
2209 | si->dont_invalidate = true; | |
2210 | } | |
2211 | } | |
2212 | } | |
8b57bfeb JJ |
2213 | |
2214 | if (si != NULL && initializer_zerop (gimple_assign_rhs1 (stmt))) | |
2215 | { | |
2216 | /* Allow adjust_last_stmt to remove it if the stored '\0' | |
2217 | is immediately overwritten. */ | |
2218 | laststmt.stmt = stmt; | |
2219 | laststmt.len = build_int_cst (size_type_node, 1); | |
2220 | laststmt.stridx = si->idx; | |
2221 | } | |
2222 | return true; | |
2223 | } | |
2224 | ||
3b1970cb PK |
2225 | /* Try to fold strstr (s, t) eq/ne s to memcmp (s, t, strlen (t)) eq/ne 0. */ |
2226 | ||
2227 | static void | |
2228 | fold_strstr_to_memcmp (tree rhs1, tree rhs2, gimple *stmt) | |
2229 | { | |
2230 | if (TREE_CODE (rhs1) != SSA_NAME | |
2231 | || TREE_CODE (rhs2) != SSA_NAME) | |
2232 | return; | |
2233 | ||
2234 | gimple *call_stmt = NULL; | |
2235 | for (int pass = 0; pass < 2; pass++) | |
2236 | { | |
2237 | gimple *g = SSA_NAME_DEF_STMT (rhs1); | |
2238 | if (gimple_call_builtin_p (g, BUILT_IN_STRSTR) | |
2239 | && has_single_use (rhs1) | |
2240 | && gimple_call_arg (g, 0) == rhs2) | |
2241 | { | |
2242 | call_stmt = g; | |
2243 | break; | |
2244 | } | |
2245 | std::swap (rhs1, rhs2); | |
2246 | } | |
2247 | ||
2248 | if (call_stmt) | |
2249 | { | |
2250 | tree arg0 = gimple_call_arg (call_stmt, 0); | |
2251 | ||
2252 | if (arg0 == rhs2) | |
2253 | { | |
2254 | tree arg1 = gimple_call_arg (call_stmt, 1); | |
2255 | tree arg1_len = NULL_TREE; | |
2256 | int idx = get_stridx (arg1); | |
2257 | ||
2258 | if (idx) | |
2259 | { | |
2260 | if (idx < 0) | |
2261 | arg1_len = build_int_cst (size_type_node, ~idx); | |
2262 | else | |
2263 | { | |
2264 | strinfo *si = get_strinfo (idx); | |
2265 | if (si) | |
2266 | arg1_len = get_string_length (si); | |
2267 | } | |
2268 | } | |
2269 | ||
2270 | if (arg1_len != NULL_TREE) | |
2271 | { | |
2272 | gimple_stmt_iterator gsi = gsi_for_stmt (call_stmt); | |
2273 | tree memcmp_decl = builtin_decl_explicit (BUILT_IN_MEMCMP); | |
2274 | gcall *memcmp_call = gimple_build_call (memcmp_decl, 3, | |
2275 | arg0, arg1, arg1_len); | |
2276 | tree memcmp_lhs = make_ssa_name (integer_type_node); | |
2277 | gimple_set_vuse (memcmp_call, gimple_vuse (call_stmt)); | |
2278 | gimple_call_set_lhs (memcmp_call, memcmp_lhs); | |
2279 | gsi_remove (&gsi, true); | |
2280 | gsi_insert_before (&gsi, memcmp_call, GSI_SAME_STMT); | |
2281 | tree zero = build_zero_cst (TREE_TYPE (memcmp_lhs)); | |
2282 | ||
2283 | if (is_gimple_assign (stmt)) | |
2284 | { | |
2285 | if (gimple_assign_rhs_code (stmt) == COND_EXPR) | |
2286 | { | |
2287 | tree cond = gimple_assign_rhs1 (stmt); | |
2288 | TREE_OPERAND (cond, 0) = memcmp_lhs; | |
2289 | TREE_OPERAND (cond, 1) = zero; | |
2290 | } | |
2291 | else | |
2292 | { | |
2293 | gimple_assign_set_rhs1 (stmt, memcmp_lhs); | |
2294 | gimple_assign_set_rhs2 (stmt, zero); | |
2295 | } | |
2296 | } | |
2297 | else | |
2298 | { | |
2299 | gcond *cond = as_a<gcond *> (stmt); | |
2300 | gimple_cond_set_lhs (cond, memcmp_lhs); | |
2301 | gimple_cond_set_rhs (cond, zero); | |
2302 | } | |
2303 | update_stmt (stmt); | |
2304 | } | |
2305 | } | |
2306 | } | |
2307 | } | |
2308 | ||
8b57bfeb JJ |
2309 | /* Attempt to optimize a single statement at *GSI using string length |
2310 | knowledge. */ | |
2311 | ||
2312 | static bool | |
2313 | strlen_optimize_stmt (gimple_stmt_iterator *gsi) | |
2314 | { | |
355fe088 | 2315 | gimple *stmt = gsi_stmt (*gsi); |
8b57bfeb JJ |
2316 | |
2317 | if (is_gimple_call (stmt)) | |
2318 | { | |
2319 | tree callee = gimple_call_fndecl (stmt); | |
0ad84f34 | 2320 | if (valid_builtin_call (stmt)) |
8b57bfeb JJ |
2321 | switch (DECL_FUNCTION_CODE (callee)) |
2322 | { | |
2323 | case BUILT_IN_STRLEN: | |
f5fc4a04 | 2324 | case BUILT_IN_STRLEN_CHKP: |
8b57bfeb JJ |
2325 | handle_builtin_strlen (gsi); |
2326 | break; | |
2327 | case BUILT_IN_STRCHR: | |
f5fc4a04 | 2328 | case BUILT_IN_STRCHR_CHKP: |
8b57bfeb JJ |
2329 | handle_builtin_strchr (gsi); |
2330 | break; | |
2331 | case BUILT_IN_STRCPY: | |
2332 | case BUILT_IN_STRCPY_CHK: | |
2333 | case BUILT_IN_STPCPY: | |
2334 | case BUILT_IN_STPCPY_CHK: | |
f5fc4a04 IE |
2335 | case BUILT_IN_STRCPY_CHKP: |
2336 | case BUILT_IN_STRCPY_CHK_CHKP: | |
2337 | case BUILT_IN_STPCPY_CHKP: | |
2338 | case BUILT_IN_STPCPY_CHK_CHKP: | |
8b57bfeb JJ |
2339 | handle_builtin_strcpy (DECL_FUNCTION_CODE (callee), gsi); |
2340 | break; | |
2341 | case BUILT_IN_MEMCPY: | |
2342 | case BUILT_IN_MEMCPY_CHK: | |
2343 | case BUILT_IN_MEMPCPY: | |
2344 | case BUILT_IN_MEMPCPY_CHK: | |
f5fc4a04 IE |
2345 | case BUILT_IN_MEMCPY_CHKP: |
2346 | case BUILT_IN_MEMCPY_CHK_CHKP: | |
2347 | case BUILT_IN_MEMPCPY_CHKP: | |
2348 | case BUILT_IN_MEMPCPY_CHK_CHKP: | |
8b57bfeb JJ |
2349 | handle_builtin_memcpy (DECL_FUNCTION_CODE (callee), gsi); |
2350 | break; | |
2351 | case BUILT_IN_STRCAT: | |
2352 | case BUILT_IN_STRCAT_CHK: | |
f5fc4a04 IE |
2353 | case BUILT_IN_STRCAT_CHKP: |
2354 | case BUILT_IN_STRCAT_CHK_CHKP: | |
8b57bfeb JJ |
2355 | handle_builtin_strcat (DECL_FUNCTION_CODE (callee), gsi); |
2356 | break; | |
24314386 MG |
2357 | case BUILT_IN_MALLOC: |
2358 | case BUILT_IN_CALLOC: | |
2359 | handle_builtin_malloc (DECL_FUNCTION_CODE (callee), gsi); | |
2360 | break; | |
2361 | case BUILT_IN_MEMSET: | |
2362 | if (!handle_builtin_memset (gsi)) | |
2363 | return false; | |
2364 | break; | |
36b85e43 BS |
2365 | case BUILT_IN_MEMCMP: |
2366 | if (!handle_builtin_memcmp (gsi)) | |
2367 | return false; | |
2368 | break; | |
8b57bfeb JJ |
2369 | default: |
2370 | break; | |
2371 | } | |
2372 | } | |
5004bd00 | 2373 | else if (is_gimple_assign (stmt) && !gimple_clobber_p (stmt)) |
8b57bfeb JJ |
2374 | { |
2375 | tree lhs = gimple_assign_lhs (stmt); | |
2376 | ||
2377 | if (TREE_CODE (lhs) == SSA_NAME && POINTER_TYPE_P (TREE_TYPE (lhs))) | |
2378 | { | |
2379 | if (gimple_assign_single_p (stmt) | |
2380 | || (gimple_assign_cast_p (stmt) | |
2381 | && POINTER_TYPE_P (TREE_TYPE (gimple_assign_rhs1 (stmt))))) | |
2382 | { | |
2383 | int idx = get_stridx (gimple_assign_rhs1 (stmt)); | |
9771b263 | 2384 | ssa_ver_to_stridx[SSA_NAME_VERSION (lhs)] = idx; |
8b57bfeb JJ |
2385 | } |
2386 | else if (gimple_assign_rhs_code (stmt) == POINTER_PLUS_EXPR) | |
2387 | handle_pointer_plus (gsi); | |
2388 | } | |
3b1970cb PK |
2389 | else if (TREE_CODE (lhs) == SSA_NAME && INTEGRAL_TYPE_P (TREE_TYPE (lhs))) |
2390 | { | |
2391 | enum tree_code code = gimple_assign_rhs_code (stmt); | |
2392 | if (code == COND_EXPR) | |
2393 | { | |
2394 | tree cond = gimple_assign_rhs1 (stmt); | |
2395 | enum tree_code cond_code = TREE_CODE (cond); | |
2396 | ||
2397 | if (cond_code == EQ_EXPR || cond_code == NE_EXPR) | |
2398 | fold_strstr_to_memcmp (TREE_OPERAND (cond, 0), | |
2399 | TREE_OPERAND (cond, 1), stmt); | |
2400 | } | |
2401 | else if (code == EQ_EXPR || code == NE_EXPR) | |
2402 | fold_strstr_to_memcmp (gimple_assign_rhs1 (stmt), | |
2403 | gimple_assign_rhs2 (stmt), stmt); | |
2404 | } | |
2405 | else if (TREE_CODE (lhs) != SSA_NAME && !TREE_SIDE_EFFECTS (lhs)) | |
8b57bfeb JJ |
2406 | { |
2407 | tree type = TREE_TYPE (lhs); | |
2408 | if (TREE_CODE (type) == ARRAY_TYPE) | |
2409 | type = TREE_TYPE (type); | |
2410 | if (TREE_CODE (type) == INTEGER_TYPE | |
2411 | && TYPE_MODE (type) == TYPE_MODE (char_type_node) | |
2412 | && TYPE_PRECISION (type) == TYPE_PRECISION (char_type_node)) | |
2413 | { | |
2414 | if (! handle_char_store (gsi)) | |
2415 | return false; | |
2416 | } | |
2417 | } | |
2418 | } | |
3b1970cb PK |
2419 | else if (gcond *cond = dyn_cast<gcond *> (stmt)) |
2420 | { | |
2421 | enum tree_code code = gimple_cond_code (cond); | |
2422 | if (code == EQ_EXPR || code == NE_EXPR) | |
2423 | fold_strstr_to_memcmp (gimple_cond_lhs (stmt), | |
2424 | gimple_cond_rhs (stmt), stmt); | |
2425 | } | |
8b57bfeb JJ |
2426 | |
2427 | if (gimple_vdef (stmt)) | |
2428 | maybe_invalidate (stmt); | |
2429 | return true; | |
2430 | } | |
2431 | ||
2432 | /* Recursively call maybe_invalidate on stmts that might be executed | |
2433 | in between dombb and current bb and that contain a vdef. Stop when | |
2434 | *count stmts are inspected, or if the whole strinfo vector has | |
2435 | been invalidated. */ | |
2436 | ||
2437 | static void | |
355fe088 | 2438 | do_invalidate (basic_block dombb, gimple *phi, bitmap visited, int *count) |
8b57bfeb JJ |
2439 | { |
2440 | unsigned int i, n = gimple_phi_num_args (phi); | |
2441 | ||
2442 | for (i = 0; i < n; i++) | |
2443 | { | |
2444 | tree vuse = gimple_phi_arg_def (phi, i); | |
355fe088 | 2445 | gimple *stmt = SSA_NAME_DEF_STMT (vuse); |
8b57bfeb JJ |
2446 | basic_block bb = gimple_bb (stmt); |
2447 | if (bb == NULL | |
2448 | || bb == dombb | |
2449 | || !bitmap_set_bit (visited, bb->index) | |
2450 | || !dominated_by_p (CDI_DOMINATORS, bb, dombb)) | |
2451 | continue; | |
2452 | while (1) | |
2453 | { | |
2454 | if (gimple_code (stmt) == GIMPLE_PHI) | |
2455 | { | |
2456 | do_invalidate (dombb, stmt, visited, count); | |
2457 | if (*count == 0) | |
2458 | return; | |
2459 | break; | |
2460 | } | |
2461 | if (--*count == 0) | |
2462 | return; | |
2463 | if (!maybe_invalidate (stmt)) | |
2464 | { | |
2465 | *count = 0; | |
2466 | return; | |
2467 | } | |
2468 | vuse = gimple_vuse (stmt); | |
2469 | stmt = SSA_NAME_DEF_STMT (vuse); | |
2470 | if (gimple_bb (stmt) != bb) | |
2471 | { | |
2472 | bb = gimple_bb (stmt); | |
2473 | if (bb == NULL | |
2474 | || bb == dombb | |
2475 | || !bitmap_set_bit (visited, bb->index) | |
2476 | || !dominated_by_p (CDI_DOMINATORS, bb, dombb)) | |
2477 | break; | |
2478 | } | |
2479 | } | |
2480 | } | |
2481 | } | |
2482 | ||
4d9192b5 TS |
2483 | class strlen_dom_walker : public dom_walker |
2484 | { | |
2485 | public: | |
2486 | strlen_dom_walker (cdi_direction direction) : dom_walker (direction) {} | |
2487 | ||
3daacdcd | 2488 | virtual edge before_dom_children (basic_block); |
4d9192b5 TS |
2489 | virtual void after_dom_children (basic_block); |
2490 | }; | |
2491 | ||
8b57bfeb | 2492 | /* Callback for walk_dominator_tree. Attempt to optimize various |
c7880c8c | 2493 | string ops by remembering string lengths pointed by pointer SSA_NAMEs. */ |
8b57bfeb | 2494 | |
3daacdcd | 2495 | edge |
4d9192b5 | 2496 | strlen_dom_walker::before_dom_children (basic_block bb) |
8b57bfeb | 2497 | { |
8b57bfeb JJ |
2498 | basic_block dombb = get_immediate_dominator (CDI_DOMINATORS, bb); |
2499 | ||
2500 | if (dombb == NULL) | |
2501 | stridx_to_strinfo = NULL; | |
2502 | else | |
2503 | { | |
526ceb68 | 2504 | stridx_to_strinfo = ((vec<strinfo *, va_heap, vl_embed> *) dombb->aux); |
8b57bfeb JJ |
2505 | if (stridx_to_strinfo) |
2506 | { | |
538dd0b7 DM |
2507 | for (gphi_iterator gsi = gsi_start_phis (bb); !gsi_end_p (gsi); |
2508 | gsi_next (&gsi)) | |
8b57bfeb | 2509 | { |
538dd0b7 | 2510 | gphi *phi = gsi.phi (); |
ea057359 | 2511 | if (virtual_operand_p (gimple_phi_result (phi))) |
8b57bfeb JJ |
2512 | { |
2513 | bitmap visited = BITMAP_ALLOC (NULL); | |
2514 | int count_vdef = 100; | |
2515 | do_invalidate (dombb, phi, visited, &count_vdef); | |
2516 | BITMAP_FREE (visited); | |
8b29fd4e JJ |
2517 | if (count_vdef == 0) |
2518 | { | |
2519 | /* If there were too many vdefs in between immediate | |
2520 | dominator and current bb, invalidate everything. | |
2521 | If stridx_to_strinfo has been unshared, we need | |
2522 | to free it, otherwise just set it to NULL. */ | |
2523 | if (!strinfo_shared ()) | |
2524 | { | |
2525 | unsigned int i; | |
526ceb68 | 2526 | strinfo *si; |
8b29fd4e JJ |
2527 | |
2528 | for (i = 1; | |
2529 | vec_safe_iterate (stridx_to_strinfo, i, &si); | |
2530 | ++i) | |
2531 | { | |
2532 | free_strinfo (si); | |
2533 | (*stridx_to_strinfo)[i] = NULL; | |
2534 | } | |
2535 | } | |
2536 | else | |
2537 | stridx_to_strinfo = NULL; | |
2538 | } | |
8b57bfeb JJ |
2539 | break; |
2540 | } | |
2541 | } | |
2542 | } | |
2543 | } | |
2544 | ||
2545 | /* If all PHI arguments have the same string index, the PHI result | |
2546 | has it as well. */ | |
538dd0b7 DM |
2547 | for (gphi_iterator gsi = gsi_start_phis (bb); !gsi_end_p (gsi); |
2548 | gsi_next (&gsi)) | |
8b57bfeb | 2549 | { |
538dd0b7 | 2550 | gphi *phi = gsi.phi (); |
8b57bfeb | 2551 | tree result = gimple_phi_result (phi); |
ea057359 | 2552 | if (!virtual_operand_p (result) && POINTER_TYPE_P (TREE_TYPE (result))) |
8b57bfeb JJ |
2553 | { |
2554 | int idx = get_stridx (gimple_phi_arg_def (phi, 0)); | |
2555 | if (idx != 0) | |
2556 | { | |
2557 | unsigned int i, n = gimple_phi_num_args (phi); | |
2558 | for (i = 1; i < n; i++) | |
2559 | if (idx != get_stridx (gimple_phi_arg_def (phi, i))) | |
2560 | break; | |
2561 | if (i == n) | |
9771b263 | 2562 | ssa_ver_to_stridx[SSA_NAME_VERSION (result)] = idx; |
8b57bfeb JJ |
2563 | } |
2564 | } | |
2565 | } | |
2566 | ||
2567 | /* Attempt to optimize individual statements. */ | |
538dd0b7 | 2568 | for (gimple_stmt_iterator gsi = gsi_start_bb (bb); !gsi_end_p (gsi); ) |
8b57bfeb JJ |
2569 | if (strlen_optimize_stmt (&gsi)) |
2570 | gsi_next (&gsi); | |
2571 | ||
2572 | bb->aux = stridx_to_strinfo; | |
9771b263 | 2573 | if (vec_safe_length (stridx_to_strinfo) && !strinfo_shared ()) |
526ceb68 | 2574 | (*stridx_to_strinfo)[0] = (strinfo *) bb; |
3daacdcd | 2575 | return NULL; |
8b57bfeb JJ |
2576 | } |
2577 | ||
2578 | /* Callback for walk_dominator_tree. Free strinfo vector if it is | |
2579 | owned by the current bb, clear bb->aux. */ | |
2580 | ||
4d9192b5 TS |
2581 | void |
2582 | strlen_dom_walker::after_dom_children (basic_block bb) | |
8b57bfeb JJ |
2583 | { |
2584 | if (bb->aux) | |
2585 | { | |
526ceb68 | 2586 | stridx_to_strinfo = ((vec<strinfo *, va_heap, vl_embed> *) bb->aux); |
9771b263 | 2587 | if (vec_safe_length (stridx_to_strinfo) |
526ceb68 | 2588 | && (*stridx_to_strinfo)[0] == (strinfo *) bb) |
8b57bfeb JJ |
2589 | { |
2590 | unsigned int i; | |
526ceb68 | 2591 | strinfo *si; |
8b57bfeb | 2592 | |
9771b263 | 2593 | for (i = 1; vec_safe_iterate (stridx_to_strinfo, i, &si); ++i) |
8b57bfeb | 2594 | free_strinfo (si); |
9771b263 | 2595 | vec_free (stridx_to_strinfo); |
8b57bfeb JJ |
2596 | } |
2597 | bb->aux = NULL; | |
2598 | } | |
2599 | } | |
2600 | ||
2601 | /* Main entry point. */ | |
2602 | ||
27a4cd48 DM |
2603 | namespace { |
2604 | ||
2605 | const pass_data pass_data_strlen = | |
8b57bfeb | 2606 | { |
27a4cd48 DM |
2607 | GIMPLE_PASS, /* type */ |
2608 | "strlen", /* name */ | |
2609 | OPTGROUP_NONE, /* optinfo_flags */ | |
27a4cd48 DM |
2610 | TV_TREE_STRLEN, /* tv_id */ |
2611 | ( PROP_cfg | PROP_ssa ), /* properties_required */ | |
2612 | 0, /* properties_provided */ | |
2613 | 0, /* properties_destroyed */ | |
2614 | 0, /* todo_flags_start */ | |
3bea341f | 2615 | 0, /* todo_flags_finish */ |
8b57bfeb | 2616 | }; |
27a4cd48 DM |
2617 | |
2618 | class pass_strlen : public gimple_opt_pass | |
2619 | { | |
2620 | public: | |
c3284718 RS |
2621 | pass_strlen (gcc::context *ctxt) |
2622 | : gimple_opt_pass (pass_data_strlen, ctxt) | |
27a4cd48 DM |
2623 | {} |
2624 | ||
2625 | /* opt_pass methods: */ | |
1a3d085c | 2626 | virtual bool gate (function *) { return flag_optimize_strlen != 0; } |
be55bfe6 | 2627 | virtual unsigned int execute (function *); |
27a4cd48 DM |
2628 | |
2629 | }; // class pass_strlen | |
2630 | ||
be55bfe6 TS |
2631 | unsigned int |
2632 | pass_strlen::execute (function *fun) | |
2633 | { | |
2634 | ssa_ver_to_stridx.safe_grow_cleared (num_ssa_names); | |
2635 | max_stridx = 1; | |
be55bfe6 TS |
2636 | |
2637 | calculate_dominance_info (CDI_DOMINATORS); | |
2638 | ||
2639 | /* String length optimization is implemented as a walk of the dominator | |
2640 | tree and a forward walk of statements within each block. */ | |
2641 | strlen_dom_walker (CDI_DOMINATORS).walk (fun->cfg->x_entry_block_ptr); | |
2642 | ||
2643 | ssa_ver_to_stridx.release (); | |
33e7d32e | 2644 | strinfo_pool.release (); |
c203e8a7 | 2645 | if (decl_to_stridxlist_htab) |
be55bfe6 TS |
2646 | { |
2647 | obstack_free (&stridx_obstack, NULL); | |
c203e8a7 TS |
2648 | delete decl_to_stridxlist_htab; |
2649 | decl_to_stridxlist_htab = NULL; | |
be55bfe6 TS |
2650 | } |
2651 | laststmt.stmt = NULL; | |
2652 | laststmt.len = NULL_TREE; | |
2653 | laststmt.stridx = 0; | |
2654 | ||
2655 | return 0; | |
2656 | } | |
2657 | ||
27a4cd48 DM |
2658 | } // anon namespace |
2659 | ||
2660 | gimple_opt_pass * | |
2661 | make_pass_strlen (gcc::context *ctxt) | |
2662 | { | |
2663 | return new pass_strlen (ctxt); | |
2664 | } |