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8b57bfeb | 1 | /* String length optimization |
5624e564 | 2 | Copyright (C) 2011-2015 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" | |
40e23961 | 24 | #include "alias.h" |
c7131fb2 | 25 | #include "backend.h" |
4d648807 | 26 | #include "tree.h" |
c7131fb2 AM |
27 | #include "gimple.h" |
28 | #include "rtl.h" | |
29 | #include "ssa.h" | |
30 | #include "options.h" | |
40e23961 | 31 | #include "fold-const.h" |
d8a2d370 | 32 | #include "stor-layout.h" |
2fb9a547 AM |
33 | #include "internal-fn.h" |
34 | #include "gimple-fold.h" | |
35 | #include "tree-eh.h" | |
45b0be94 | 36 | #include "gimplify.h" |
5be5c238 | 37 | #include "gimple-iterator.h" |
18f429e2 | 38 | #include "gimplify-me.h" |
36566b39 | 39 | #include "flags.h" |
36566b39 PK |
40 | #include "insn-config.h" |
41 | #include "expmed.h" | |
42 | #include "dojump.h" | |
43 | #include "explow.h" | |
44 | #include "calls.h" | |
45 | #include "emit-rtl.h" | |
46 | #include "varasm.h" | |
47 | #include "stmt.h" | |
d8a2d370 | 48 | #include "expr.h" |
442b4905 | 49 | #include "tree-dfa.h" |
8b57bfeb JJ |
50 | #include "tree-pass.h" |
51 | #include "domwalk.h" | |
52 | #include "alloc-pool.h" | |
53 | #include "tree-ssa-propagate.h" | |
54 | #include "gimple-pretty-print.h" | |
55 | #include "params.h" | |
f5fc4a04 IE |
56 | #include "cgraph.h" |
57 | #include "ipa-chkp.h" | |
910ee068 | 58 | #include "tree-hash-traits.h" |
8b57bfeb JJ |
59 | |
60 | /* A vector indexed by SSA_NAME_VERSION. 0 means unknown, positive value | |
61 | is an index into strinfo vector, negative value stands for | |
62 | string length of a string literal (~strlen). */ | |
9771b263 | 63 | static vec<int> ssa_ver_to_stridx; |
8b57bfeb JJ |
64 | |
65 | /* Number of currently active string indexes plus one. */ | |
66 | static int max_stridx; | |
67 | ||
68 | /* String information record. */ | |
69 | typedef struct strinfo_struct | |
70 | { | |
71 | /* String length of this string. */ | |
72 | tree length; | |
73 | /* Any of the corresponding pointers for querying alias oracle. */ | |
74 | tree ptr; | |
75 | /* Statement for delayed length computation. */ | |
76 | gimple stmt; | |
77 | /* Pointer to '\0' if known, if NULL, it can be computed as | |
78 | ptr + length. */ | |
79 | tree endptr; | |
80 | /* Reference count. Any changes to strinfo entry possibly shared | |
81 | with dominating basic blocks need unshare_strinfo first, except | |
82 | for dont_invalidate which affects only the immediately next | |
83 | maybe_invalidate. */ | |
84 | int refcount; | |
85 | /* Copy of index. get_strinfo (si->idx) should return si; */ | |
86 | int idx; | |
87 | /* These 3 fields are for chaining related string pointers together. | |
88 | E.g. for | |
89 | bl = strlen (b); dl = strlen (d); strcpy (a, b); c = a + bl; | |
90 | strcpy (c, d); e = c + dl; | |
91 | strinfo(a) -> strinfo(c) -> strinfo(e) | |
92 | All have ->first field equal to strinfo(a)->idx and are doubly | |
93 | chained through prev/next fields. The later strinfos are required | |
94 | to point into the same string with zero or more bytes after | |
95 | the previous pointer and all bytes in between the two pointers | |
96 | must be non-zero. Functions like strcpy or memcpy are supposed | |
97 | to adjust all previous strinfo lengths, but not following strinfo | |
98 | lengths (those are uncertain, usually invalidated during | |
99 | maybe_invalidate, except when the alias oracle knows better). | |
100 | Functions like strcat on the other side adjust the whole | |
101 | related strinfo chain. | |
102 | They are updated lazily, so to use the chain the same first fields | |
103 | and si->prev->next == si->idx needs to be verified. */ | |
104 | int first; | |
105 | int next; | |
106 | int prev; | |
107 | /* A flag whether the string is known to be written in the current | |
108 | function. */ | |
109 | bool writable; | |
110 | /* A flag for the next maybe_invalidate that this strinfo shouldn't | |
111 | be invalidated. Always cleared by maybe_invalidate. */ | |
112 | bool dont_invalidate; | |
113 | } *strinfo; | |
8b57bfeb JJ |
114 | |
115 | /* Pool for allocating strinfo_struct entries. */ | |
33e7d32e | 116 | static pool_allocator<strinfo_struct> strinfo_pool ("strinfo_struct pool", 64); |
8b57bfeb JJ |
117 | |
118 | /* Vector mapping positive string indexes to strinfo, for the | |
119 | current basic block. The first pointer in the vector is special, | |
120 | it is either NULL, meaning the vector isn't shared, or it is | |
121 | a basic block pointer to the owner basic_block if shared. | |
122 | If some other bb wants to modify the vector, the vector needs | |
123 | to be unshared first, and only the owner bb is supposed to free it. */ | |
9771b263 | 124 | static vec<strinfo, va_heap, vl_embed> *stridx_to_strinfo; |
8b57bfeb JJ |
125 | |
126 | /* One OFFSET->IDX mapping. */ | |
127 | struct stridxlist | |
128 | { | |
129 | struct stridxlist *next; | |
130 | HOST_WIDE_INT offset; | |
131 | int idx; | |
132 | }; | |
133 | ||
134 | /* Hash table entry, mapping a DECL to a chain of OFFSET->IDX mappings. */ | |
135 | struct decl_stridxlist_map | |
136 | { | |
137 | struct tree_map_base base; | |
138 | struct stridxlist list; | |
139 | }; | |
140 | ||
141 | /* Hash table for mapping decls to a chained list of offset -> idx | |
142 | mappings. */ | |
fb5c464a | 143 | static hash_map<tree_decl_hash, stridxlist> *decl_to_stridxlist_htab; |
8b57bfeb JJ |
144 | |
145 | /* Obstack for struct stridxlist and struct decl_stridxlist_map. */ | |
146 | static struct obstack stridx_obstack; | |
147 | ||
148 | /* Last memcpy statement if it could be adjusted if the trailing | |
149 | '\0' written is immediately overwritten, or | |
150 | *x = '\0' store that could be removed if it is immediately overwritten. */ | |
151 | struct laststmt_struct | |
152 | { | |
153 | gimple stmt; | |
154 | tree len; | |
155 | int stridx; | |
156 | } laststmt; | |
157 | ||
204a913b JJ |
158 | static int get_stridx_plus_constant (strinfo, HOST_WIDE_INT, tree); |
159 | ||
160 | /* Return strinfo vector entry IDX. */ | |
161 | ||
162 | static inline strinfo | |
163 | get_strinfo (int idx) | |
164 | { | |
165 | if (vec_safe_length (stridx_to_strinfo) <= (unsigned int) idx) | |
166 | return NULL; | |
167 | return (*stridx_to_strinfo)[idx]; | |
168 | } | |
169 | ||
8b57bfeb JJ |
170 | /* Helper function for get_stridx. */ |
171 | ||
172 | static int | |
173 | get_addr_stridx (tree exp) | |
174 | { | |
175 | HOST_WIDE_INT off; | |
8b57bfeb JJ |
176 | struct stridxlist *list; |
177 | tree base; | |
178 | ||
c203e8a7 | 179 | if (!decl_to_stridxlist_htab) |
8b57bfeb JJ |
180 | return 0; |
181 | ||
182 | base = get_addr_base_and_unit_offset (exp, &off); | |
183 | if (base == NULL || !DECL_P (base)) | |
184 | return 0; | |
185 | ||
1eb68d2d TS |
186 | list = decl_to_stridxlist_htab->get (base); |
187 | if (list == NULL) | |
8b57bfeb JJ |
188 | return 0; |
189 | ||
8b57bfeb JJ |
190 | do |
191 | { | |
192 | if (list->offset == off) | |
193 | return list->idx; | |
194 | list = list->next; | |
195 | } | |
196 | while (list); | |
197 | return 0; | |
198 | } | |
199 | ||
200 | /* Return string index for EXP. */ | |
201 | ||
202 | static int | |
203 | get_stridx (tree exp) | |
204 | { | |
b3c3685a | 205 | tree s, o; |
8b57bfeb JJ |
206 | |
207 | if (TREE_CODE (exp) == SSA_NAME) | |
204a913b JJ |
208 | { |
209 | if (ssa_ver_to_stridx[SSA_NAME_VERSION (exp)]) | |
210 | return ssa_ver_to_stridx[SSA_NAME_VERSION (exp)]; | |
211 | int i; | |
212 | tree e = exp; | |
213 | HOST_WIDE_INT off = 0; | |
214 | for (i = 0; i < 5; i++) | |
215 | { | |
216 | gimple def_stmt = SSA_NAME_DEF_STMT (e); | |
217 | if (!is_gimple_assign (def_stmt) | |
218 | || gimple_assign_rhs_code (def_stmt) != POINTER_PLUS_EXPR) | |
219 | return 0; | |
220 | tree rhs1 = gimple_assign_rhs1 (def_stmt); | |
221 | tree rhs2 = gimple_assign_rhs2 (def_stmt); | |
222 | if (TREE_CODE (rhs1) != SSA_NAME | |
223 | || !tree_fits_shwi_p (rhs2)) | |
224 | return 0; | |
225 | HOST_WIDE_INT this_off = tree_to_shwi (rhs2); | |
226 | if (this_off < 0) | |
227 | return 0; | |
228 | off = (unsigned HOST_WIDE_INT) off + this_off; | |
229 | if (off < 0) | |
230 | return 0; | |
231 | if (ssa_ver_to_stridx[SSA_NAME_VERSION (rhs1)]) | |
232 | { | |
233 | strinfo si | |
234 | = get_strinfo (ssa_ver_to_stridx[SSA_NAME_VERSION (rhs1)]); | |
235 | if (si | |
236 | && si->length | |
237 | && TREE_CODE (si->length) == INTEGER_CST | |
238 | && compare_tree_int (si->length, off) != -1) | |
239 | return get_stridx_plus_constant (si, off, exp); | |
240 | } | |
241 | e = rhs1; | |
242 | } | |
243 | return 0; | |
244 | } | |
8b57bfeb JJ |
245 | |
246 | if (TREE_CODE (exp) == ADDR_EXPR) | |
247 | { | |
248 | int idx = get_addr_stridx (TREE_OPERAND (exp, 0)); | |
249 | if (idx != 0) | |
250 | return idx; | |
251 | } | |
252 | ||
b3c3685a JJ |
253 | s = string_constant (exp, &o); |
254 | if (s != NULL_TREE | |
9541ffee | 255 | && (o == NULL_TREE || tree_fits_shwi_p (o)) |
b3c3685a | 256 | && TREE_STRING_LENGTH (s) > 0) |
8b57bfeb | 257 | { |
9439e9a1 | 258 | HOST_WIDE_INT offset = o ? tree_to_shwi (o) : 0; |
b3c3685a JJ |
259 | const char *p = TREE_STRING_POINTER (s); |
260 | int max = TREE_STRING_LENGTH (s) - 1; | |
261 | ||
262 | if (p[max] == '\0' && offset >= 0 && offset <= max) | |
263 | return ~(int) strlen (p + offset); | |
8b57bfeb JJ |
264 | } |
265 | return 0; | |
266 | } | |
267 | ||
268 | /* Return true if strinfo vector is shared with the immediate dominator. */ | |
269 | ||
270 | static inline bool | |
271 | strinfo_shared (void) | |
272 | { | |
9771b263 DN |
273 | return vec_safe_length (stridx_to_strinfo) |
274 | && (*stridx_to_strinfo)[0] != NULL; | |
8b57bfeb JJ |
275 | } |
276 | ||
277 | /* Unshare strinfo vector that is shared with the immediate dominator. */ | |
278 | ||
279 | static void | |
280 | unshare_strinfo_vec (void) | |
281 | { | |
282 | strinfo si; | |
283 | unsigned int i = 0; | |
284 | ||
285 | gcc_assert (strinfo_shared ()); | |
9771b263 DN |
286 | stridx_to_strinfo = vec_safe_copy (stridx_to_strinfo); |
287 | for (i = 1; vec_safe_iterate (stridx_to_strinfo, i, &si); ++i) | |
8b57bfeb JJ |
288 | if (si != NULL) |
289 | si->refcount++; | |
9771b263 | 290 | (*stridx_to_strinfo)[0] = NULL; |
8b57bfeb JJ |
291 | } |
292 | ||
293 | /* Attempt to create a string index for exp, ADDR_EXPR's operand. | |
294 | Return a pointer to the location where the string index can | |
295 | be stored (if 0) or is stored, or NULL if this can't be tracked. */ | |
296 | ||
297 | static int * | |
298 | addr_stridxptr (tree exp) | |
299 | { | |
8b57bfeb JJ |
300 | HOST_WIDE_INT off; |
301 | ||
302 | tree base = get_addr_base_and_unit_offset (exp, &off); | |
303 | if (base == NULL_TREE || !DECL_P (base)) | |
304 | return NULL; | |
305 | ||
c203e8a7 | 306 | if (!decl_to_stridxlist_htab) |
8b57bfeb | 307 | { |
1eb68d2d | 308 | decl_to_stridxlist_htab |
fb5c464a | 309 | = new hash_map<tree_decl_hash, stridxlist> (64); |
8b57bfeb JJ |
310 | gcc_obstack_init (&stridx_obstack); |
311 | } | |
1eb68d2d TS |
312 | |
313 | bool existed; | |
314 | stridxlist *list = &decl_to_stridxlist_htab->get_or_insert (base, &existed); | |
315 | if (existed) | |
8b57bfeb JJ |
316 | { |
317 | int i; | |
8b57bfeb JJ |
318 | for (i = 0; i < 16; i++) |
319 | { | |
320 | if (list->offset == off) | |
321 | return &list->idx; | |
322 | if (list->next == NULL) | |
323 | break; | |
324 | } | |
325 | if (i == 16) | |
326 | return NULL; | |
327 | list->next = XOBNEW (&stridx_obstack, struct stridxlist); | |
328 | list = list->next; | |
329 | } | |
1eb68d2d | 330 | |
8b57bfeb JJ |
331 | list->next = NULL; |
332 | list->offset = off; | |
333 | list->idx = 0; | |
334 | return &list->idx; | |
335 | } | |
336 | ||
337 | /* Create a new string index, or return 0 if reached limit. */ | |
338 | ||
339 | static int | |
340 | new_stridx (tree exp) | |
341 | { | |
342 | int idx; | |
343 | if (max_stridx >= PARAM_VALUE (PARAM_MAX_TRACKED_STRLENS)) | |
344 | return 0; | |
345 | if (TREE_CODE (exp) == SSA_NAME) | |
346 | { | |
347 | if (SSA_NAME_OCCURS_IN_ABNORMAL_PHI (exp)) | |
348 | return 0; | |
349 | idx = max_stridx++; | |
9771b263 | 350 | ssa_ver_to_stridx[SSA_NAME_VERSION (exp)] = idx; |
8b57bfeb JJ |
351 | return idx; |
352 | } | |
353 | if (TREE_CODE (exp) == ADDR_EXPR) | |
354 | { | |
355 | int *pidx = addr_stridxptr (TREE_OPERAND (exp, 0)); | |
356 | if (pidx != NULL) | |
357 | { | |
358 | gcc_assert (*pidx == 0); | |
359 | *pidx = max_stridx++; | |
360 | return *pidx; | |
361 | } | |
362 | } | |
363 | return 0; | |
364 | } | |
365 | ||
366 | /* Like new_stridx, but for ADDR_EXPR's operand instead. */ | |
367 | ||
368 | static int | |
369 | new_addr_stridx (tree exp) | |
370 | { | |
371 | int *pidx; | |
372 | if (max_stridx >= PARAM_VALUE (PARAM_MAX_TRACKED_STRLENS)) | |
373 | return 0; | |
374 | pidx = addr_stridxptr (exp); | |
375 | if (pidx != NULL) | |
376 | { | |
377 | gcc_assert (*pidx == 0); | |
378 | *pidx = max_stridx++; | |
379 | return *pidx; | |
380 | } | |
381 | return 0; | |
382 | } | |
383 | ||
384 | /* Create a new strinfo. */ | |
385 | ||
386 | static strinfo | |
387 | new_strinfo (tree ptr, int idx, tree length) | |
388 | { | |
33e7d32e | 389 | strinfo si = strinfo_pool.allocate (); |
8b57bfeb JJ |
390 | si->length = length; |
391 | si->ptr = ptr; | |
392 | si->stmt = NULL; | |
393 | si->endptr = NULL_TREE; | |
394 | si->refcount = 1; | |
395 | si->idx = idx; | |
396 | si->first = 0; | |
397 | si->prev = 0; | |
398 | si->next = 0; | |
399 | si->writable = false; | |
400 | si->dont_invalidate = false; | |
401 | return si; | |
402 | } | |
403 | ||
404 | /* Decrease strinfo refcount and free it if not referenced anymore. */ | |
405 | ||
406 | static inline void | |
407 | free_strinfo (strinfo si) | |
408 | { | |
409 | if (si && --si->refcount == 0) | |
33e7d32e | 410 | strinfo_pool.remove (si); |
8b57bfeb JJ |
411 | } |
412 | ||
8b57bfeb JJ |
413 | /* Set strinfo in the vector entry IDX to SI. */ |
414 | ||
415 | static inline void | |
416 | set_strinfo (int idx, strinfo si) | |
417 | { | |
9771b263 | 418 | if (vec_safe_length (stridx_to_strinfo) && (*stridx_to_strinfo)[0]) |
8b57bfeb | 419 | unshare_strinfo_vec (); |
9771b263 DN |
420 | if (vec_safe_length (stridx_to_strinfo) <= (unsigned int) idx) |
421 | vec_safe_grow_cleared (stridx_to_strinfo, idx + 1); | |
422 | (*stridx_to_strinfo)[idx] = si; | |
8b57bfeb JJ |
423 | } |
424 | ||
425 | /* Return string length, or NULL if it can't be computed. */ | |
426 | ||
427 | static tree | |
428 | get_string_length (strinfo si) | |
429 | { | |
430 | if (si->length) | |
431 | return si->length; | |
432 | ||
433 | if (si->stmt) | |
434 | { | |
435 | gimple stmt = si->stmt, lenstmt; | |
f5fc4a04 | 436 | bool with_bounds = gimple_call_with_bounds_p (stmt); |
83d5977e | 437 | tree callee, lhs, fn, tem; |
8b57bfeb JJ |
438 | location_t loc; |
439 | gimple_stmt_iterator gsi; | |
440 | ||
441 | gcc_assert (is_gimple_call (stmt)); | |
442 | callee = gimple_call_fndecl (stmt); | |
443 | gcc_assert (callee && DECL_BUILT_IN_CLASS (callee) == BUILT_IN_NORMAL); | |
444 | lhs = gimple_call_lhs (stmt); | |
8b57bfeb JJ |
445 | /* unshare_strinfo is intentionally not called here. The (delayed) |
446 | transformation of strcpy or strcat into stpcpy is done at the place | |
447 | of the former strcpy/strcat call and so can affect all the strinfos | |
448 | with the same stmt. If they were unshared before and transformation | |
449 | has been already done, the handling of BUILT_IN_STPCPY{,_CHK} should | |
450 | just compute the right length. */ | |
451 | switch (DECL_FUNCTION_CODE (callee)) | |
452 | { | |
453 | case BUILT_IN_STRCAT: | |
454 | case BUILT_IN_STRCAT_CHK: | |
f5fc4a04 IE |
455 | case BUILT_IN_STRCAT_CHKP: |
456 | case BUILT_IN_STRCAT_CHK_CHKP: | |
8b57bfeb | 457 | gsi = gsi_for_stmt (stmt); |
e79983f4 | 458 | fn = builtin_decl_implicit (BUILT_IN_STRLEN); |
8b57bfeb | 459 | gcc_assert (lhs == NULL_TREE); |
8b57bfeb | 460 | tem = unshare_expr (gimple_call_arg (stmt, 0)); |
f5fc4a04 IE |
461 | if (with_bounds) |
462 | { | |
463 | lenstmt = gimple_build_call (chkp_maybe_create_clone (fn)->decl, | |
464 | 2, tem, gimple_call_arg (stmt, 1)); | |
465 | gimple_call_set_with_bounds (lenstmt, true); | |
466 | } | |
467 | else | |
468 | lenstmt = gimple_build_call (fn, 1, tem); | |
83d5977e | 469 | lhs = make_ssa_name (TREE_TYPE (TREE_TYPE (fn)), lenstmt); |
8b57bfeb JJ |
470 | gimple_call_set_lhs (lenstmt, lhs); |
471 | gimple_set_vuse (lenstmt, gimple_vuse (stmt)); | |
472 | gsi_insert_before (&gsi, lenstmt, GSI_SAME_STMT); | |
8b57bfeb | 473 | tem = gimple_call_arg (stmt, 0); |
33960e2e TG |
474 | if (!ptrofftype_p (TREE_TYPE (lhs))) |
475 | { | |
476 | lhs = convert_to_ptrofftype (lhs); | |
477 | lhs = force_gimple_operand_gsi (&gsi, lhs, true, NULL_TREE, | |
478 | true, GSI_SAME_STMT); | |
479 | } | |
0d0e4a03 JJ |
480 | lenstmt = gimple_build_assign |
481 | (make_ssa_name (TREE_TYPE (gimple_call_arg (stmt, 0))), | |
482 | POINTER_PLUS_EXPR,tem, lhs); | |
8b57bfeb JJ |
483 | gsi_insert_before (&gsi, lenstmt, GSI_SAME_STMT); |
484 | gimple_call_set_arg (stmt, 0, gimple_assign_lhs (lenstmt)); | |
485 | lhs = NULL_TREE; | |
486 | /* FALLTHRU */ | |
487 | case BUILT_IN_STRCPY: | |
488 | case BUILT_IN_STRCPY_CHK: | |
f5fc4a04 IE |
489 | case BUILT_IN_STRCPY_CHKP: |
490 | case BUILT_IN_STRCPY_CHK_CHKP: | |
1e762c6a | 491 | gcc_assert (builtin_decl_implicit_p (BUILT_IN_STPCPY)); |
f5fc4a04 | 492 | if (gimple_call_num_args (stmt) == (with_bounds ? 4 : 2)) |
e79983f4 | 493 | fn = builtin_decl_implicit (BUILT_IN_STPCPY); |
8b57bfeb | 494 | else |
e79983f4 | 495 | fn = builtin_decl_explicit (BUILT_IN_STPCPY_CHK); |
f5fc4a04 IE |
496 | if (with_bounds) |
497 | fn = chkp_maybe_create_clone (fn)->decl; | |
8b57bfeb JJ |
498 | gcc_assert (lhs == NULL_TREE); |
499 | if (dump_file && (dump_flags & TDF_DETAILS) != 0) | |
500 | { | |
501 | fprintf (dump_file, "Optimizing: "); | |
502 | print_gimple_stmt (dump_file, stmt, 0, TDF_SLIM); | |
503 | } | |
504 | gimple_call_set_fndecl (stmt, fn); | |
83d5977e | 505 | lhs = make_ssa_name (TREE_TYPE (TREE_TYPE (fn)), stmt); |
8b57bfeb JJ |
506 | gimple_call_set_lhs (stmt, lhs); |
507 | update_stmt (stmt); | |
508 | if (dump_file && (dump_flags & TDF_DETAILS) != 0) | |
509 | { | |
510 | fprintf (dump_file, "into: "); | |
511 | print_gimple_stmt (dump_file, stmt, 0, TDF_SLIM); | |
512 | } | |
513 | /* FALLTHRU */ | |
514 | case BUILT_IN_STPCPY: | |
515 | case BUILT_IN_STPCPY_CHK: | |
f5fc4a04 IE |
516 | case BUILT_IN_STPCPY_CHKP: |
517 | case BUILT_IN_STPCPY_CHK_CHKP: | |
8b57bfeb JJ |
518 | gcc_assert (lhs != NULL_TREE); |
519 | loc = gimple_location (stmt); | |
520 | si->endptr = lhs; | |
521 | si->stmt = NULL; | |
522 | lhs = fold_convert_loc (loc, size_type_node, lhs); | |
523 | si->length = fold_convert_loc (loc, size_type_node, si->ptr); | |
524 | si->length = fold_build2_loc (loc, MINUS_EXPR, size_type_node, | |
525 | lhs, si->length); | |
526 | break; | |
24314386 MG |
527 | case BUILT_IN_MALLOC: |
528 | break; | |
529 | /* BUILT_IN_CALLOC always has si->length set. */ | |
8b57bfeb JJ |
530 | default: |
531 | gcc_unreachable (); | |
532 | break; | |
533 | } | |
534 | } | |
535 | ||
536 | return si->length; | |
537 | } | |
538 | ||
539 | /* Invalidate string length information for strings whose length | |
540 | might change due to stores in stmt. */ | |
541 | ||
542 | static bool | |
543 | maybe_invalidate (gimple stmt) | |
544 | { | |
545 | strinfo si; | |
546 | unsigned int i; | |
547 | bool nonempty = false; | |
548 | ||
9771b263 | 549 | for (i = 1; vec_safe_iterate (stridx_to_strinfo, i, &si); ++i) |
8b57bfeb JJ |
550 | if (si != NULL) |
551 | { | |
552 | if (!si->dont_invalidate) | |
553 | { | |
554 | ao_ref r; | |
24314386 | 555 | /* Do not use si->length. */ |
8b57bfeb JJ |
556 | ao_ref_init_from_ptr_and_size (&r, si->ptr, NULL_TREE); |
557 | if (stmt_may_clobber_ref_p_1 (stmt, &r)) | |
558 | { | |
559 | set_strinfo (i, NULL); | |
560 | free_strinfo (si); | |
561 | continue; | |
562 | } | |
563 | } | |
564 | si->dont_invalidate = false; | |
565 | nonempty = true; | |
566 | } | |
567 | return nonempty; | |
568 | } | |
569 | ||
204a913b | 570 | /* Unshare strinfo record SI, if it has refcount > 1 or |
8b57bfeb JJ |
571 | if stridx_to_strinfo vector is shared with some other |
572 | bbs. */ | |
573 | ||
574 | static strinfo | |
575 | unshare_strinfo (strinfo si) | |
576 | { | |
577 | strinfo nsi; | |
578 | ||
579 | if (si->refcount == 1 && !strinfo_shared ()) | |
580 | return si; | |
581 | ||
582 | nsi = new_strinfo (si->ptr, si->idx, si->length); | |
583 | nsi->stmt = si->stmt; | |
584 | nsi->endptr = si->endptr; | |
585 | nsi->first = si->first; | |
586 | nsi->prev = si->prev; | |
587 | nsi->next = si->next; | |
588 | nsi->writable = si->writable; | |
589 | set_strinfo (si->idx, nsi); | |
590 | free_strinfo (si); | |
591 | return nsi; | |
592 | } | |
593 | ||
594 | /* Return first strinfo in the related strinfo chain | |
595 | if all strinfos in between belong to the chain, otherwise | |
596 | NULL. */ | |
597 | ||
598 | static strinfo | |
599 | verify_related_strinfos (strinfo origsi) | |
600 | { | |
601 | strinfo si = origsi, psi; | |
602 | ||
603 | if (origsi->first == 0) | |
604 | return NULL; | |
605 | for (; si->prev; si = psi) | |
606 | { | |
607 | if (si->first != origsi->first) | |
608 | return NULL; | |
609 | psi = get_strinfo (si->prev); | |
610 | if (psi == NULL) | |
611 | return NULL; | |
612 | if (psi->next != si->idx) | |
613 | return NULL; | |
614 | } | |
615 | if (si->idx != si->first) | |
616 | return NULL; | |
617 | return si; | |
618 | } | |
619 | ||
204a913b JJ |
620 | /* Attempt to create a new strinfo for BASESI + OFF, or find existing |
621 | strinfo if there is any. Return it's idx, or 0 if no strinfo has | |
622 | been created. */ | |
623 | ||
624 | static int | |
625 | get_stridx_plus_constant (strinfo basesi, HOST_WIDE_INT off, tree ptr) | |
626 | { | |
627 | gcc_checking_assert (TREE_CODE (ptr) == SSA_NAME); | |
628 | ||
629 | if (SSA_NAME_OCCURS_IN_ABNORMAL_PHI (ptr)) | |
630 | return 0; | |
631 | ||
632 | if (basesi->length == NULL_TREE | |
633 | || TREE_CODE (basesi->length) != INTEGER_CST | |
634 | || compare_tree_int (basesi->length, off) == -1 | |
635 | || !tree_fits_shwi_p (basesi->length)) | |
636 | return 0; | |
637 | ||
638 | HOST_WIDE_INT len = tree_to_shwi (basesi->length) - off; | |
639 | strinfo si = basesi, chainsi; | |
640 | if (si->first || si->prev || si->next) | |
641 | si = verify_related_strinfos (basesi); | |
642 | if (si == NULL | |
643 | || si->length == NULL_TREE | |
644 | || TREE_CODE (si->length) != INTEGER_CST) | |
645 | return 0; | |
646 | ||
647 | if (ssa_ver_to_stridx.length () <= SSA_NAME_VERSION (ptr)) | |
648 | ssa_ver_to_stridx.safe_grow_cleared (num_ssa_names); | |
649 | ||
650 | gcc_checking_assert (compare_tree_int (si->length, off) != -1); | |
651 | for (chainsi = si; chainsi->next; chainsi = si) | |
652 | { | |
653 | si = get_strinfo (chainsi->next); | |
654 | if (si == NULL | |
655 | || si->first != chainsi->first | |
656 | || si->prev != chainsi->idx | |
657 | || si->length == NULL_TREE | |
658 | || TREE_CODE (si->length) != INTEGER_CST) | |
659 | break; | |
660 | int r = compare_tree_int (si->length, len); | |
661 | if (r != 1) | |
662 | { | |
663 | if (r == 0) | |
664 | { | |
665 | ssa_ver_to_stridx[SSA_NAME_VERSION (ptr)] = si->idx; | |
666 | return si->idx; | |
667 | } | |
668 | break; | |
669 | } | |
670 | } | |
671 | ||
672 | int idx = new_stridx (ptr); | |
673 | if (idx == 0) | |
674 | return 0; | |
675 | si = new_strinfo (ptr, idx, build_int_cst (size_type_node, len)); | |
676 | set_strinfo (idx, si); | |
677 | if (chainsi->next) | |
678 | { | |
679 | strinfo nextsi = unshare_strinfo (get_strinfo (chainsi->next)); | |
680 | si->next = nextsi->idx; | |
681 | nextsi->prev = idx; | |
682 | } | |
683 | chainsi = unshare_strinfo (chainsi); | |
684 | if (chainsi->first == 0) | |
685 | chainsi->first = chainsi->idx; | |
686 | chainsi->next = idx; | |
687 | if (chainsi->endptr == NULL_TREE && len == 0) | |
688 | chainsi->endptr = ptr; | |
689 | si->endptr = chainsi->endptr; | |
690 | si->prev = chainsi->idx; | |
691 | si->first = chainsi->first; | |
692 | si->writable = chainsi->writable; | |
693 | return si->idx; | |
694 | } | |
695 | ||
8b57bfeb JJ |
696 | /* Note that PTR, a pointer SSA_NAME initialized in the current stmt, points |
697 | to a zero-length string and if possible chain it to a related strinfo | |
698 | chain whose part is or might be CHAINSI. */ | |
699 | ||
700 | static strinfo | |
701 | zero_length_string (tree ptr, strinfo chainsi) | |
702 | { | |
703 | strinfo si; | |
704 | int idx; | |
204a913b JJ |
705 | if (ssa_ver_to_stridx.length () <= SSA_NAME_VERSION (ptr)) |
706 | ssa_ver_to_stridx.safe_grow_cleared (num_ssa_names); | |
8b57bfeb | 707 | gcc_checking_assert (TREE_CODE (ptr) == SSA_NAME |
204a913b | 708 | && ssa_ver_to_stridx[SSA_NAME_VERSION (ptr)] == 0); |
8b57bfeb JJ |
709 | |
710 | if (SSA_NAME_OCCURS_IN_ABNORMAL_PHI (ptr)) | |
711 | return NULL; | |
712 | if (chainsi != NULL) | |
713 | { | |
714 | si = verify_related_strinfos (chainsi); | |
715 | if (si) | |
716 | { | |
717 | chainsi = si; | |
718 | for (; chainsi->next; chainsi = si) | |
719 | { | |
720 | if (chainsi->endptr == NULL_TREE) | |
721 | { | |
722 | chainsi = unshare_strinfo (chainsi); | |
723 | chainsi->endptr = ptr; | |
724 | } | |
725 | si = get_strinfo (chainsi->next); | |
726 | if (si == NULL | |
727 | || si->first != chainsi->first | |
728 | || si->prev != chainsi->idx) | |
729 | break; | |
730 | } | |
93a90db6 | 731 | gcc_assert (chainsi->length || chainsi->stmt); |
8b57bfeb JJ |
732 | if (chainsi->endptr == NULL_TREE) |
733 | { | |
734 | chainsi = unshare_strinfo (chainsi); | |
735 | chainsi->endptr = ptr; | |
736 | } | |
93a90db6 | 737 | if (chainsi->length && integer_zerop (chainsi->length)) |
8b57bfeb JJ |
738 | { |
739 | if (chainsi->next) | |
740 | { | |
741 | chainsi = unshare_strinfo (chainsi); | |
742 | chainsi->next = 0; | |
743 | } | |
9771b263 | 744 | ssa_ver_to_stridx[SSA_NAME_VERSION (ptr)] = chainsi->idx; |
8b57bfeb JJ |
745 | return chainsi; |
746 | } | |
747 | } | |
748 | else if (chainsi->first || chainsi->prev || chainsi->next) | |
749 | { | |
750 | chainsi = unshare_strinfo (chainsi); | |
751 | chainsi->first = 0; | |
752 | chainsi->prev = 0; | |
753 | chainsi->next = 0; | |
754 | } | |
755 | } | |
756 | idx = new_stridx (ptr); | |
757 | if (idx == 0) | |
758 | return NULL; | |
759 | si = new_strinfo (ptr, idx, build_int_cst (size_type_node, 0)); | |
760 | set_strinfo (idx, si); | |
761 | si->endptr = ptr; | |
762 | if (chainsi != NULL) | |
763 | { | |
764 | chainsi = unshare_strinfo (chainsi); | |
765 | if (chainsi->first == 0) | |
766 | chainsi->first = chainsi->idx; | |
767 | chainsi->next = idx; | |
93a90db6 AK |
768 | if (chainsi->endptr == NULL_TREE) |
769 | chainsi->endptr = ptr; | |
8b57bfeb JJ |
770 | si->prev = chainsi->idx; |
771 | si->first = chainsi->first; | |
772 | si->writable = chainsi->writable; | |
773 | } | |
774 | return si; | |
775 | } | |
776 | ||
777 | /* For strinfo ORIGSI whose length has been just updated | |
778 | update also related strinfo lengths (add ADJ to each, | |
779 | but don't adjust ORIGSI). */ | |
780 | ||
781 | static void | |
782 | adjust_related_strinfos (location_t loc, strinfo origsi, tree adj) | |
783 | { | |
784 | strinfo si = verify_related_strinfos (origsi); | |
785 | ||
786 | if (si == NULL) | |
787 | return; | |
788 | ||
789 | while (1) | |
790 | { | |
791 | strinfo nsi; | |
792 | ||
793 | if (si != origsi) | |
794 | { | |
795 | tree tem; | |
796 | ||
797 | si = unshare_strinfo (si); | |
93a90db6 AK |
798 | if (si->length) |
799 | { | |
800 | tem = fold_convert_loc (loc, TREE_TYPE (si->length), adj); | |
801 | si->length = fold_build2_loc (loc, PLUS_EXPR, | |
802 | TREE_TYPE (si->length), si->length, | |
803 | tem); | |
804 | } | |
805 | else if (si->stmt != NULL) | |
806 | /* Delayed length computation is unaffected. */ | |
807 | ; | |
808 | else | |
809 | gcc_unreachable (); | |
810 | ||
8b57bfeb JJ |
811 | si->endptr = NULL_TREE; |
812 | si->dont_invalidate = true; | |
813 | } | |
814 | if (si->next == 0) | |
815 | return; | |
816 | nsi = get_strinfo (si->next); | |
817 | if (nsi == NULL | |
818 | || nsi->first != si->first | |
819 | || nsi->prev != si->idx) | |
820 | return; | |
821 | si = nsi; | |
822 | } | |
823 | } | |
824 | ||
825 | /* Find if there are other SSA_NAME pointers equal to PTR | |
826 | for which we don't track their string lengths yet. If so, use | |
827 | IDX for them. */ | |
828 | ||
829 | static void | |
830 | find_equal_ptrs (tree ptr, int idx) | |
831 | { | |
832 | if (TREE_CODE (ptr) != SSA_NAME) | |
833 | return; | |
834 | while (1) | |
835 | { | |
836 | gimple stmt = SSA_NAME_DEF_STMT (ptr); | |
837 | if (!is_gimple_assign (stmt)) | |
838 | return; | |
839 | ptr = gimple_assign_rhs1 (stmt); | |
840 | switch (gimple_assign_rhs_code (stmt)) | |
841 | { | |
842 | case SSA_NAME: | |
843 | break; | |
97246d78 JJ |
844 | CASE_CONVERT: |
845 | if (!POINTER_TYPE_P (TREE_TYPE (ptr))) | |
846 | return; | |
847 | if (TREE_CODE (ptr) == SSA_NAME) | |
848 | break; | |
849 | if (TREE_CODE (ptr) != ADDR_EXPR) | |
850 | return; | |
851 | /* FALLTHRU */ | |
8b57bfeb JJ |
852 | case ADDR_EXPR: |
853 | { | |
854 | int *pidx = addr_stridxptr (TREE_OPERAND (ptr, 0)); | |
855 | if (pidx != NULL && *pidx == 0) | |
856 | *pidx = idx; | |
857 | return; | |
858 | } | |
8b57bfeb JJ |
859 | default: |
860 | return; | |
861 | } | |
862 | ||
863 | /* We might find an endptr created in this pass. Grow the | |
864 | vector in that case. */ | |
9771b263 DN |
865 | if (ssa_ver_to_stridx.length () <= SSA_NAME_VERSION (ptr)) |
866 | ssa_ver_to_stridx.safe_grow_cleared (num_ssa_names); | |
8b57bfeb | 867 | |
9771b263 | 868 | if (ssa_ver_to_stridx[SSA_NAME_VERSION (ptr)] != 0) |
8b57bfeb | 869 | return; |
9771b263 | 870 | ssa_ver_to_stridx[SSA_NAME_VERSION (ptr)] = idx; |
8b57bfeb JJ |
871 | } |
872 | } | |
873 | ||
874 | /* If the last .MEM setter statement before STMT is | |
875 | memcpy (x, y, strlen (y) + 1), the only .MEM use of it is STMT | |
876 | and STMT is known to overwrite x[strlen (x)], adjust the last memcpy to | |
877 | just memcpy (x, y, strlen (y)). SI must be the zero length | |
878 | strinfo. */ | |
879 | ||
880 | static void | |
881 | adjust_last_stmt (strinfo si, gimple stmt, bool is_strcat) | |
882 | { | |
883 | tree vuse, callee, len; | |
884 | struct laststmt_struct last = laststmt; | |
885 | strinfo lastsi, firstsi; | |
f5fc4a04 | 886 | unsigned len_arg_no = 2; |
8b57bfeb JJ |
887 | |
888 | laststmt.stmt = NULL; | |
889 | laststmt.len = NULL_TREE; | |
890 | laststmt.stridx = 0; | |
891 | ||
892 | if (last.stmt == NULL) | |
893 | return; | |
894 | ||
895 | vuse = gimple_vuse (stmt); | |
896 | if (vuse == NULL_TREE | |
897 | || SSA_NAME_DEF_STMT (vuse) != last.stmt | |
898 | || !has_single_use (vuse)) | |
899 | return; | |
900 | ||
901 | gcc_assert (last.stridx > 0); | |
902 | lastsi = get_strinfo (last.stridx); | |
903 | if (lastsi == NULL) | |
904 | return; | |
905 | ||
906 | if (lastsi != si) | |
907 | { | |
908 | if (lastsi->first == 0 || lastsi->first != si->first) | |
909 | return; | |
910 | ||
911 | firstsi = verify_related_strinfos (si); | |
912 | if (firstsi == NULL) | |
913 | return; | |
914 | while (firstsi != lastsi) | |
915 | { | |
916 | strinfo nextsi; | |
917 | if (firstsi->next == 0) | |
918 | return; | |
919 | nextsi = get_strinfo (firstsi->next); | |
920 | if (nextsi == NULL | |
921 | || nextsi->prev != firstsi->idx | |
922 | || nextsi->first != si->first) | |
923 | return; | |
924 | firstsi = nextsi; | |
925 | } | |
926 | } | |
927 | ||
928 | if (!is_strcat) | |
929 | { | |
930 | if (si->length == NULL_TREE || !integer_zerop (si->length)) | |
931 | return; | |
932 | } | |
933 | ||
934 | if (is_gimple_assign (last.stmt)) | |
935 | { | |
936 | gimple_stmt_iterator gsi; | |
937 | ||
938 | if (!integer_zerop (gimple_assign_rhs1 (last.stmt))) | |
939 | return; | |
940 | if (stmt_could_throw_p (last.stmt)) | |
941 | return; | |
942 | gsi = gsi_for_stmt (last.stmt); | |
943 | unlink_stmt_vdef (last.stmt); | |
944 | release_defs (last.stmt); | |
945 | gsi_remove (&gsi, true); | |
946 | return; | |
947 | } | |
948 | ||
3626621a | 949 | if (!gimple_call_builtin_p (last.stmt, BUILT_IN_NORMAL)) |
8b57bfeb JJ |
950 | return; |
951 | ||
3626621a | 952 | callee = gimple_call_fndecl (last.stmt); |
8b57bfeb JJ |
953 | switch (DECL_FUNCTION_CODE (callee)) |
954 | { | |
955 | case BUILT_IN_MEMCPY: | |
956 | case BUILT_IN_MEMCPY_CHK: | |
957 | break; | |
f5fc4a04 IE |
958 | case BUILT_IN_MEMCPY_CHKP: |
959 | case BUILT_IN_MEMCPY_CHK_CHKP: | |
960 | len_arg_no = 4; | |
961 | break; | |
8b57bfeb JJ |
962 | default: |
963 | return; | |
964 | } | |
965 | ||
f5fc4a04 | 966 | len = gimple_call_arg (last.stmt, len_arg_no); |
cc269bb6 | 967 | if (tree_fits_uhwi_p (len)) |
8b57bfeb | 968 | { |
cc269bb6 | 969 | if (!tree_fits_uhwi_p (last.len) |
8b57bfeb | 970 | || integer_zerop (len) |
7d362f6c | 971 | || tree_to_uhwi (len) != tree_to_uhwi (last.len) + 1) |
8b57bfeb JJ |
972 | return; |
973 | /* Don't adjust the length if it is divisible by 4, it is more efficient | |
974 | to store the extra '\0' in that case. */ | |
7d362f6c | 975 | if ((tree_to_uhwi (len) & 3) == 0) |
8b57bfeb JJ |
976 | return; |
977 | } | |
978 | else if (TREE_CODE (len) == SSA_NAME) | |
979 | { | |
980 | gimple def_stmt = SSA_NAME_DEF_STMT (len); | |
981 | if (!is_gimple_assign (def_stmt) | |
982 | || gimple_assign_rhs_code (def_stmt) != PLUS_EXPR | |
983 | || gimple_assign_rhs1 (def_stmt) != last.len | |
984 | || !integer_onep (gimple_assign_rhs2 (def_stmt))) | |
985 | return; | |
986 | } | |
987 | else | |
988 | return; | |
989 | ||
f5fc4a04 | 990 | gimple_call_set_arg (last.stmt, len_arg_no, last.len); |
8b57bfeb JJ |
991 | update_stmt (last.stmt); |
992 | } | |
993 | ||
994 | /* Handle a strlen call. If strlen of the argument is known, replace | |
995 | the strlen call with the known value, otherwise remember that strlen | |
996 | of the argument is stored in the lhs SSA_NAME. */ | |
997 | ||
998 | static void | |
999 | handle_builtin_strlen (gimple_stmt_iterator *gsi) | |
1000 | { | |
1001 | int idx; | |
1002 | tree src; | |
1003 | gimple stmt = gsi_stmt (*gsi); | |
1004 | tree lhs = gimple_call_lhs (stmt); | |
1005 | ||
1006 | if (lhs == NULL_TREE) | |
1007 | return; | |
1008 | ||
1009 | src = gimple_call_arg (stmt, 0); | |
1010 | idx = get_stridx (src); | |
1011 | if (idx) | |
1012 | { | |
1013 | strinfo si = NULL; | |
1014 | tree rhs; | |
1015 | ||
1016 | if (idx < 0) | |
1017 | rhs = build_int_cst (TREE_TYPE (lhs), ~idx); | |
1018 | else | |
1019 | { | |
1020 | rhs = NULL_TREE; | |
1021 | si = get_strinfo (idx); | |
1022 | if (si != NULL) | |
1023 | rhs = get_string_length (si); | |
1024 | } | |
1025 | if (rhs != NULL_TREE) | |
1026 | { | |
1027 | if (dump_file && (dump_flags & TDF_DETAILS) != 0) | |
1028 | { | |
1029 | fprintf (dump_file, "Optimizing: "); | |
1030 | print_gimple_stmt (dump_file, stmt, 0, TDF_SLIM); | |
1031 | } | |
1032 | rhs = unshare_expr (rhs); | |
1033 | if (!useless_type_conversion_p (TREE_TYPE (lhs), TREE_TYPE (rhs))) | |
1034 | rhs = fold_convert_loc (gimple_location (stmt), | |
1035 | TREE_TYPE (lhs), rhs); | |
1036 | if (!update_call_from_tree (gsi, rhs)) | |
1037 | gimplify_and_update_call_from_tree (gsi, rhs); | |
1038 | stmt = gsi_stmt (*gsi); | |
1039 | update_stmt (stmt); | |
1040 | if (dump_file && (dump_flags & TDF_DETAILS) != 0) | |
1041 | { | |
1042 | fprintf (dump_file, "into: "); | |
1043 | print_gimple_stmt (dump_file, stmt, 0, TDF_SLIM); | |
1044 | } | |
1045 | if (si != NULL | |
1046 | && TREE_CODE (si->length) != SSA_NAME | |
1047 | && TREE_CODE (si->length) != INTEGER_CST | |
1048 | && !SSA_NAME_OCCURS_IN_ABNORMAL_PHI (lhs)) | |
1049 | { | |
1050 | si = unshare_strinfo (si); | |
1051 | si->length = lhs; | |
1052 | } | |
1053 | return; | |
1054 | } | |
1055 | } | |
1056 | if (SSA_NAME_OCCURS_IN_ABNORMAL_PHI (lhs)) | |
1057 | return; | |
1058 | if (idx == 0) | |
1059 | idx = new_stridx (src); | |
1060 | else if (get_strinfo (idx) != NULL) | |
1061 | return; | |
1062 | if (idx) | |
1063 | { | |
1064 | strinfo si = new_strinfo (src, idx, lhs); | |
1065 | set_strinfo (idx, si); | |
1066 | find_equal_ptrs (src, idx); | |
1067 | } | |
1068 | } | |
1069 | ||
1070 | /* Handle a strchr call. If strlen of the first argument is known, replace | |
1071 | the strchr (x, 0) call with the endptr or x + strlen, otherwise remember | |
1072 | that lhs of the call is endptr and strlen of the argument is endptr - x. */ | |
1073 | ||
1074 | static void | |
1075 | handle_builtin_strchr (gimple_stmt_iterator *gsi) | |
1076 | { | |
1077 | int idx; | |
1078 | tree src; | |
1079 | gimple stmt = gsi_stmt (*gsi); | |
1080 | tree lhs = gimple_call_lhs (stmt); | |
f5fc4a04 | 1081 | bool with_bounds = gimple_call_with_bounds_p (stmt); |
8b57bfeb JJ |
1082 | |
1083 | if (lhs == NULL_TREE) | |
1084 | return; | |
1085 | ||
f5fc4a04 | 1086 | if (!integer_zerop (gimple_call_arg (stmt, with_bounds ? 2 : 1))) |
8b57bfeb JJ |
1087 | return; |
1088 | ||
1089 | src = gimple_call_arg (stmt, 0); | |
1090 | idx = get_stridx (src); | |
1091 | if (idx) | |
1092 | { | |
1093 | strinfo si = NULL; | |
1094 | tree rhs; | |
1095 | ||
1096 | if (idx < 0) | |
1097 | rhs = build_int_cst (size_type_node, ~idx); | |
1098 | else | |
1099 | { | |
1100 | rhs = NULL_TREE; | |
1101 | si = get_strinfo (idx); | |
1102 | if (si != NULL) | |
1103 | rhs = get_string_length (si); | |
1104 | } | |
1105 | if (rhs != NULL_TREE) | |
1106 | { | |
1107 | location_t loc = gimple_location (stmt); | |
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 | if (si != NULL && si->endptr != NULL_TREE) | |
1115 | { | |
1116 | rhs = unshare_expr (si->endptr); | |
1117 | if (!useless_type_conversion_p (TREE_TYPE (lhs), | |
1118 | TREE_TYPE (rhs))) | |
1119 | rhs = fold_convert_loc (loc, TREE_TYPE (lhs), rhs); | |
1120 | } | |
1121 | else | |
1122 | { | |
1123 | rhs = fold_convert_loc (loc, sizetype, unshare_expr (rhs)); | |
1124 | rhs = fold_build2_loc (loc, POINTER_PLUS_EXPR, | |
1125 | TREE_TYPE (src), src, rhs); | |
1126 | if (!useless_type_conversion_p (TREE_TYPE (lhs), | |
1127 | TREE_TYPE (rhs))) | |
1128 | rhs = fold_convert_loc (loc, TREE_TYPE (lhs), rhs); | |
1129 | } | |
1130 | if (!update_call_from_tree (gsi, rhs)) | |
1131 | gimplify_and_update_call_from_tree (gsi, rhs); | |
1132 | stmt = gsi_stmt (*gsi); | |
1133 | update_stmt (stmt); | |
1134 | if (dump_file && (dump_flags & TDF_DETAILS) != 0) | |
1135 | { | |
1136 | fprintf (dump_file, "into: "); | |
1137 | print_gimple_stmt (dump_file, stmt, 0, TDF_SLIM); | |
1138 | } | |
1139 | if (si != NULL | |
1140 | && si->endptr == NULL_TREE | |
1141 | && !SSA_NAME_OCCURS_IN_ABNORMAL_PHI (lhs)) | |
1142 | { | |
1143 | si = unshare_strinfo (si); | |
1144 | si->endptr = lhs; | |
1145 | } | |
1146 | zero_length_string (lhs, si); | |
1147 | return; | |
1148 | } | |
1149 | } | |
1150 | if (SSA_NAME_OCCURS_IN_ABNORMAL_PHI (lhs)) | |
1151 | return; | |
1152 | if (TREE_CODE (src) != SSA_NAME || !SSA_NAME_OCCURS_IN_ABNORMAL_PHI (src)) | |
1153 | { | |
1154 | if (idx == 0) | |
1155 | idx = new_stridx (src); | |
1156 | else if (get_strinfo (idx) != NULL) | |
1157 | { | |
1158 | zero_length_string (lhs, NULL); | |
1159 | return; | |
1160 | } | |
1161 | if (idx) | |
1162 | { | |
1163 | location_t loc = gimple_location (stmt); | |
1164 | tree lhsu = fold_convert_loc (loc, size_type_node, lhs); | |
1165 | tree srcu = fold_convert_loc (loc, size_type_node, src); | |
1166 | tree length = fold_build2_loc (loc, MINUS_EXPR, | |
1167 | size_type_node, lhsu, srcu); | |
1168 | strinfo si = new_strinfo (src, idx, length); | |
1169 | si->endptr = lhs; | |
1170 | set_strinfo (idx, si); | |
1171 | find_equal_ptrs (src, idx); | |
1172 | zero_length_string (lhs, si); | |
1173 | } | |
1174 | } | |
1175 | else | |
1176 | zero_length_string (lhs, NULL); | |
1177 | } | |
1178 | ||
1179 | /* Handle a strcpy-like ({st{r,p}cpy,__st{r,p}cpy_chk}) call. | |
1180 | If strlen of the second argument is known, strlen of the first argument | |
1181 | is the same after this call. Furthermore, attempt to convert it to | |
1182 | memcpy. */ | |
1183 | ||
1184 | static void | |
1185 | handle_builtin_strcpy (enum built_in_function bcode, gimple_stmt_iterator *gsi) | |
1186 | { | |
1187 | int idx, didx; | |
1188 | tree src, dst, srclen, len, lhs, args, type, fn, oldlen; | |
1189 | bool success; | |
1190 | gimple stmt = gsi_stmt (*gsi); | |
1191 | strinfo si, dsi, olddsi, zsi; | |
1192 | location_t loc; | |
f5fc4a04 | 1193 | bool with_bounds = gimple_call_with_bounds_p (stmt); |
8b57bfeb | 1194 | |
f5fc4a04 | 1195 | src = gimple_call_arg (stmt, with_bounds ? 2 : 1); |
8b57bfeb JJ |
1196 | dst = gimple_call_arg (stmt, 0); |
1197 | lhs = gimple_call_lhs (stmt); | |
1198 | idx = get_stridx (src); | |
1199 | si = NULL; | |
1200 | if (idx > 0) | |
1201 | si = get_strinfo (idx); | |
1202 | ||
1203 | didx = get_stridx (dst); | |
1204 | olddsi = NULL; | |
1205 | oldlen = NULL_TREE; | |
1206 | if (didx > 0) | |
1207 | olddsi = get_strinfo (didx); | |
1208 | else if (didx < 0) | |
1209 | return; | |
1210 | ||
1211 | if (olddsi != NULL) | |
1212 | adjust_last_stmt (olddsi, stmt, false); | |
1213 | ||
1214 | srclen = NULL_TREE; | |
1215 | if (si != NULL) | |
1216 | srclen = get_string_length (si); | |
1217 | else if (idx < 0) | |
1218 | srclen = build_int_cst (size_type_node, ~idx); | |
1219 | ||
1220 | loc = gimple_location (stmt); | |
1221 | if (srclen == NULL_TREE) | |
1222 | switch (bcode) | |
1223 | { | |
1224 | case BUILT_IN_STRCPY: | |
1225 | case BUILT_IN_STRCPY_CHK: | |
f5fc4a04 IE |
1226 | case BUILT_IN_STRCPY_CHKP: |
1227 | case BUILT_IN_STRCPY_CHK_CHKP: | |
e79983f4 | 1228 | if (lhs != NULL_TREE || !builtin_decl_implicit_p (BUILT_IN_STPCPY)) |
8b57bfeb JJ |
1229 | return; |
1230 | break; | |
1231 | case BUILT_IN_STPCPY: | |
1232 | case BUILT_IN_STPCPY_CHK: | |
f5fc4a04 IE |
1233 | case BUILT_IN_STPCPY_CHKP: |
1234 | case BUILT_IN_STPCPY_CHK_CHKP: | |
8b57bfeb JJ |
1235 | if (lhs == NULL_TREE) |
1236 | return; | |
1237 | else | |
1238 | { | |
1239 | tree lhsuint = fold_convert_loc (loc, size_type_node, lhs); | |
1240 | srclen = fold_convert_loc (loc, size_type_node, dst); | |
1241 | srclen = fold_build2_loc (loc, MINUS_EXPR, size_type_node, | |
1242 | lhsuint, srclen); | |
1243 | } | |
1244 | break; | |
1245 | default: | |
1246 | gcc_unreachable (); | |
1247 | } | |
1248 | ||
1249 | if (didx == 0) | |
1250 | { | |
1251 | didx = new_stridx (dst); | |
1252 | if (didx == 0) | |
1253 | return; | |
1254 | } | |
1255 | if (olddsi != NULL) | |
1256 | { | |
1257 | oldlen = olddsi->length; | |
1258 | dsi = unshare_strinfo (olddsi); | |
1259 | dsi->length = srclen; | |
1260 | /* Break the chain, so adjust_related_strinfo on later pointers in | |
1261 | the chain won't adjust this one anymore. */ | |
1262 | dsi->next = 0; | |
1263 | dsi->stmt = NULL; | |
1264 | dsi->endptr = NULL_TREE; | |
1265 | } | |
1266 | else | |
1267 | { | |
1268 | dsi = new_strinfo (dst, didx, srclen); | |
1269 | set_strinfo (didx, dsi); | |
1270 | find_equal_ptrs (dst, didx); | |
1271 | } | |
1272 | dsi->writable = true; | |
1273 | dsi->dont_invalidate = true; | |
1274 | ||
1275 | if (dsi->length == NULL_TREE) | |
1276 | { | |
93a90db6 AK |
1277 | strinfo chainsi; |
1278 | ||
8b57bfeb JJ |
1279 | /* If string length of src is unknown, use delayed length |
1280 | computation. If string lenth of dst will be needed, it | |
1281 | can be computed by transforming this strcpy call into | |
1282 | stpcpy and subtracting dst from the return value. */ | |
93a90db6 AK |
1283 | |
1284 | /* Look for earlier strings whose length could be determined if | |
1285 | this strcpy is turned into an stpcpy. */ | |
1286 | ||
1287 | if (dsi->prev != 0 && (chainsi = verify_related_strinfos (dsi)) != NULL) | |
1288 | { | |
1289 | for (; chainsi && chainsi != dsi; chainsi = get_strinfo (chainsi->next)) | |
1290 | { | |
1291 | /* When setting a stmt for delayed length computation | |
1292 | prevent all strinfos through dsi from being | |
1293 | invalidated. */ | |
1294 | chainsi = unshare_strinfo (chainsi); | |
1295 | chainsi->stmt = stmt; | |
1296 | chainsi->length = NULL_TREE; | |
1297 | chainsi->endptr = NULL_TREE; | |
1298 | chainsi->dont_invalidate = true; | |
1299 | } | |
1300 | } | |
8b57bfeb JJ |
1301 | dsi->stmt = stmt; |
1302 | return; | |
1303 | } | |
1304 | ||
1305 | if (olddsi != NULL) | |
1306 | { | |
1307 | tree adj = NULL_TREE; | |
1308 | if (oldlen == NULL_TREE) | |
1309 | ; | |
1310 | else if (integer_zerop (oldlen)) | |
1311 | adj = srclen; | |
1312 | else if (TREE_CODE (oldlen) == INTEGER_CST | |
1313 | || TREE_CODE (srclen) == INTEGER_CST) | |
1314 | adj = fold_build2_loc (loc, MINUS_EXPR, | |
1315 | TREE_TYPE (srclen), srclen, | |
1316 | fold_convert_loc (loc, TREE_TYPE (srclen), | |
1317 | oldlen)); | |
1318 | if (adj != NULL_TREE) | |
1319 | adjust_related_strinfos (loc, dsi, adj); | |
1320 | else | |
1321 | dsi->prev = 0; | |
1322 | } | |
1323 | /* strcpy src may not overlap dst, so src doesn't need to be | |
1324 | invalidated either. */ | |
1325 | if (si != NULL) | |
1326 | si->dont_invalidate = true; | |
1327 | ||
1328 | fn = NULL_TREE; | |
1329 | zsi = NULL; | |
1330 | switch (bcode) | |
1331 | { | |
1332 | case BUILT_IN_STRCPY: | |
f5fc4a04 | 1333 | case BUILT_IN_STRCPY_CHKP: |
e79983f4 | 1334 | fn = builtin_decl_implicit (BUILT_IN_MEMCPY); |
8b57bfeb | 1335 | if (lhs) |
9771b263 | 1336 | ssa_ver_to_stridx[SSA_NAME_VERSION (lhs)] = didx; |
8b57bfeb JJ |
1337 | break; |
1338 | case BUILT_IN_STRCPY_CHK: | |
f5fc4a04 | 1339 | case BUILT_IN_STRCPY_CHK_CHKP: |
e79983f4 | 1340 | fn = builtin_decl_explicit (BUILT_IN_MEMCPY_CHK); |
8b57bfeb | 1341 | if (lhs) |
9771b263 | 1342 | ssa_ver_to_stridx[SSA_NAME_VERSION (lhs)] = didx; |
8b57bfeb JJ |
1343 | break; |
1344 | case BUILT_IN_STPCPY: | |
f5fc4a04 | 1345 | case BUILT_IN_STPCPY_CHKP: |
8b57bfeb JJ |
1346 | /* This would need adjustment of the lhs (subtract one), |
1347 | or detection that the trailing '\0' doesn't need to be | |
1348 | written, if it will be immediately overwritten. | |
e79983f4 | 1349 | fn = builtin_decl_explicit (BUILT_IN_MEMPCPY); */ |
8b57bfeb JJ |
1350 | if (lhs) |
1351 | { | |
1352 | dsi->endptr = lhs; | |
1353 | zsi = zero_length_string (lhs, dsi); | |
1354 | } | |
1355 | break; | |
1356 | case BUILT_IN_STPCPY_CHK: | |
f5fc4a04 | 1357 | case BUILT_IN_STPCPY_CHK_CHKP: |
8b57bfeb JJ |
1358 | /* This would need adjustment of the lhs (subtract one), |
1359 | or detection that the trailing '\0' doesn't need to be | |
1360 | written, if it will be immediately overwritten. | |
e79983f4 | 1361 | fn = builtin_decl_explicit (BUILT_IN_MEMPCPY_CHK); */ |
8b57bfeb JJ |
1362 | if (lhs) |
1363 | { | |
1364 | dsi->endptr = lhs; | |
1365 | zsi = zero_length_string (lhs, dsi); | |
1366 | } | |
1367 | break; | |
1368 | default: | |
1369 | gcc_unreachable (); | |
1370 | } | |
1371 | if (zsi != NULL) | |
1372 | zsi->dont_invalidate = true; | |
1373 | ||
1374 | if (fn == NULL_TREE) | |
1375 | return; | |
1376 | ||
1377 | args = TYPE_ARG_TYPES (TREE_TYPE (fn)); | |
1378 | type = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (args))); | |
1379 | ||
1380 | len = fold_convert_loc (loc, type, unshare_expr (srclen)); | |
1381 | len = fold_build2_loc (loc, PLUS_EXPR, type, len, build_int_cst (type, 1)); | |
1382 | len = force_gimple_operand_gsi (gsi, len, true, NULL_TREE, true, | |
1383 | GSI_SAME_STMT); | |
1384 | if (dump_file && (dump_flags & TDF_DETAILS) != 0) | |
1385 | { | |
1386 | fprintf (dump_file, "Optimizing: "); | |
1387 | print_gimple_stmt (dump_file, stmt, 0, TDF_SLIM); | |
1388 | } | |
f5fc4a04 IE |
1389 | if (with_bounds) |
1390 | { | |
1391 | fn = chkp_maybe_create_clone (fn)->decl; | |
1392 | if (gimple_call_num_args (stmt) == 4) | |
1393 | success = update_gimple_call (gsi, fn, 5, dst, | |
1394 | gimple_call_arg (stmt, 1), | |
1395 | src, | |
1396 | gimple_call_arg (stmt, 3), | |
1397 | len); | |
1398 | else | |
1399 | success = update_gimple_call (gsi, fn, 6, dst, | |
1400 | gimple_call_arg (stmt, 1), | |
1401 | src, | |
1402 | gimple_call_arg (stmt, 3), | |
1403 | len, | |
1404 | gimple_call_arg (stmt, 4)); | |
1405 | } | |
8b57bfeb | 1406 | else |
f5fc4a04 IE |
1407 | if (gimple_call_num_args (stmt) == 2) |
1408 | success = update_gimple_call (gsi, fn, 3, dst, src, len); | |
1409 | else | |
1410 | success = update_gimple_call (gsi, fn, 4, dst, src, len, | |
1411 | gimple_call_arg (stmt, 2)); | |
8b57bfeb JJ |
1412 | if (success) |
1413 | { | |
1414 | stmt = gsi_stmt (*gsi); | |
f5fc4a04 | 1415 | gimple_call_set_with_bounds (stmt, with_bounds); |
8b57bfeb JJ |
1416 | update_stmt (stmt); |
1417 | if (dump_file && (dump_flags & TDF_DETAILS) != 0) | |
1418 | { | |
1419 | fprintf (dump_file, "into: "); | |
1420 | print_gimple_stmt (dump_file, stmt, 0, TDF_SLIM); | |
1421 | } | |
1422 | /* Allow adjust_last_stmt to decrease this memcpy's size. */ | |
1423 | laststmt.stmt = stmt; | |
1424 | laststmt.len = srclen; | |
1425 | laststmt.stridx = dsi->idx; | |
1426 | } | |
1427 | else if (dump_file && (dump_flags & TDF_DETAILS) != 0) | |
1428 | fprintf (dump_file, "not possible.\n"); | |
1429 | } | |
1430 | ||
1431 | /* Handle a memcpy-like ({mem{,p}cpy,__mem{,p}cpy_chk}) call. | |
1432 | If strlen of the second argument is known and length of the third argument | |
1433 | is that plus one, strlen of the first argument is the same after this | |
1434 | call. */ | |
1435 | ||
1436 | static void | |
1437 | handle_builtin_memcpy (enum built_in_function bcode, gimple_stmt_iterator *gsi) | |
1438 | { | |
1439 | int idx, didx; | |
1440 | tree src, dst, len, lhs, oldlen, newlen; | |
1441 | gimple stmt = gsi_stmt (*gsi); | |
1442 | strinfo si, dsi, olddsi; | |
f5fc4a04 | 1443 | bool with_bounds = gimple_call_with_bounds_p (stmt); |
8b57bfeb | 1444 | |
f5fc4a04 IE |
1445 | len = gimple_call_arg (stmt, with_bounds ? 4 : 2); |
1446 | src = gimple_call_arg (stmt, with_bounds ? 2 : 1); | |
8b57bfeb JJ |
1447 | dst = gimple_call_arg (stmt, 0); |
1448 | idx = get_stridx (src); | |
1449 | if (idx == 0) | |
1450 | return; | |
1451 | ||
1452 | didx = get_stridx (dst); | |
1453 | olddsi = NULL; | |
1454 | if (didx > 0) | |
1455 | olddsi = get_strinfo (didx); | |
1456 | else if (didx < 0) | |
1457 | return; | |
1458 | ||
1459 | if (olddsi != NULL | |
cc269bb6 | 1460 | && tree_fits_uhwi_p (len) |
8b57bfeb JJ |
1461 | && !integer_zerop (len)) |
1462 | adjust_last_stmt (olddsi, stmt, false); | |
1463 | ||
1464 | if (idx > 0) | |
1465 | { | |
1466 | gimple def_stmt; | |
1467 | ||
1468 | /* Handle memcpy (x, y, l) where l is strlen (y) + 1. */ | |
1469 | si = get_strinfo (idx); | |
1470 | if (si == NULL || si->length == NULL_TREE) | |
1471 | return; | |
1472 | if (TREE_CODE (len) != SSA_NAME) | |
1473 | return; | |
1474 | def_stmt = SSA_NAME_DEF_STMT (len); | |
1475 | if (!is_gimple_assign (def_stmt) | |
1476 | || gimple_assign_rhs_code (def_stmt) != PLUS_EXPR | |
1477 | || gimple_assign_rhs1 (def_stmt) != si->length | |
1478 | || !integer_onep (gimple_assign_rhs2 (def_stmt))) | |
1479 | return; | |
1480 | } | |
1481 | else | |
1482 | { | |
1483 | si = NULL; | |
1484 | /* Handle memcpy (x, "abcd", 5) or | |
1485 | memcpy (x, "abc\0uvw", 7). */ | |
cc269bb6 | 1486 | if (!tree_fits_uhwi_p (len) |
7d362f6c | 1487 | || tree_to_uhwi (len) <= (unsigned HOST_WIDE_INT) ~idx) |
8b57bfeb JJ |
1488 | return; |
1489 | } | |
1490 | ||
1491 | if (olddsi != NULL && TREE_CODE (len) == SSA_NAME) | |
1492 | adjust_last_stmt (olddsi, stmt, false); | |
1493 | ||
1494 | if (didx == 0) | |
1495 | { | |
1496 | didx = new_stridx (dst); | |
1497 | if (didx == 0) | |
1498 | return; | |
1499 | } | |
1500 | if (si != NULL) | |
1501 | newlen = si->length; | |
1502 | else | |
80642376 | 1503 | newlen = build_int_cst (size_type_node, ~idx); |
8b57bfeb JJ |
1504 | oldlen = NULL_TREE; |
1505 | if (olddsi != NULL) | |
1506 | { | |
1507 | dsi = unshare_strinfo (olddsi); | |
1508 | oldlen = olddsi->length; | |
1509 | dsi->length = newlen; | |
1510 | /* Break the chain, so adjust_related_strinfo on later pointers in | |
1511 | the chain won't adjust this one anymore. */ | |
1512 | dsi->next = 0; | |
1513 | dsi->stmt = NULL; | |
1514 | dsi->endptr = NULL_TREE; | |
1515 | } | |
1516 | else | |
1517 | { | |
1518 | dsi = new_strinfo (dst, didx, newlen); | |
1519 | set_strinfo (didx, dsi); | |
1520 | find_equal_ptrs (dst, didx); | |
1521 | } | |
1522 | dsi->writable = true; | |
1523 | dsi->dont_invalidate = true; | |
1524 | if (olddsi != NULL) | |
1525 | { | |
1526 | tree adj = NULL_TREE; | |
1527 | location_t loc = gimple_location (stmt); | |
1528 | if (oldlen == NULL_TREE) | |
1529 | ; | |
1530 | else if (integer_zerop (oldlen)) | |
1531 | adj = dsi->length; | |
1532 | else if (TREE_CODE (oldlen) == INTEGER_CST | |
1533 | || TREE_CODE (dsi->length) == INTEGER_CST) | |
1534 | adj = fold_build2_loc (loc, MINUS_EXPR, | |
1535 | TREE_TYPE (dsi->length), dsi->length, | |
1536 | fold_convert_loc (loc, TREE_TYPE (dsi->length), | |
1537 | oldlen)); | |
1538 | if (adj != NULL_TREE) | |
1539 | adjust_related_strinfos (loc, dsi, adj); | |
1540 | else | |
1541 | dsi->prev = 0; | |
1542 | } | |
1543 | /* memcpy src may not overlap dst, so src doesn't need to be | |
1544 | invalidated either. */ | |
1545 | if (si != NULL) | |
1546 | si->dont_invalidate = true; | |
1547 | ||
1548 | lhs = gimple_call_lhs (stmt); | |
1549 | switch (bcode) | |
1550 | { | |
1551 | case BUILT_IN_MEMCPY: | |
1552 | case BUILT_IN_MEMCPY_CHK: | |
f5fc4a04 IE |
1553 | case BUILT_IN_MEMCPY_CHKP: |
1554 | case BUILT_IN_MEMCPY_CHK_CHKP: | |
8b57bfeb JJ |
1555 | /* Allow adjust_last_stmt to decrease this memcpy's size. */ |
1556 | laststmt.stmt = stmt; | |
1557 | laststmt.len = dsi->length; | |
1558 | laststmt.stridx = dsi->idx; | |
1559 | if (lhs) | |
9771b263 | 1560 | ssa_ver_to_stridx[SSA_NAME_VERSION (lhs)] = didx; |
8b57bfeb JJ |
1561 | break; |
1562 | case BUILT_IN_MEMPCPY: | |
1563 | case BUILT_IN_MEMPCPY_CHK: | |
f5fc4a04 IE |
1564 | case BUILT_IN_MEMPCPY_CHKP: |
1565 | case BUILT_IN_MEMPCPY_CHK_CHKP: | |
8b57bfeb JJ |
1566 | break; |
1567 | default: | |
1568 | gcc_unreachable (); | |
1569 | } | |
1570 | } | |
1571 | ||
1572 | /* Handle a strcat-like ({strcat,__strcat_chk}) call. | |
1573 | If strlen of the second argument is known, strlen of the first argument | |
1574 | is increased by the length of the second argument. Furthermore, attempt | |
1575 | to convert it to memcpy/strcpy if the length of the first argument | |
1576 | is known. */ | |
1577 | ||
1578 | static void | |
1579 | handle_builtin_strcat (enum built_in_function bcode, gimple_stmt_iterator *gsi) | |
1580 | { | |
1581 | int idx, didx; | |
1582 | tree src, dst, srclen, dstlen, len, lhs, args, type, fn, objsz, endptr; | |
1583 | bool success; | |
1584 | gimple stmt = gsi_stmt (*gsi); | |
1585 | strinfo si, dsi; | |
1586 | location_t loc; | |
f5fc4a04 | 1587 | bool with_bounds = gimple_call_with_bounds_p (stmt); |
8b57bfeb | 1588 | |
f5fc4a04 | 1589 | src = gimple_call_arg (stmt, with_bounds ? 2 : 1); |
8b57bfeb JJ |
1590 | dst = gimple_call_arg (stmt, 0); |
1591 | lhs = gimple_call_lhs (stmt); | |
1592 | ||
1593 | didx = get_stridx (dst); | |
1594 | if (didx < 0) | |
1595 | return; | |
1596 | ||
1597 | dsi = NULL; | |
1598 | if (didx > 0) | |
1599 | dsi = get_strinfo (didx); | |
1600 | if (dsi == NULL || get_string_length (dsi) == NULL_TREE) | |
1601 | { | |
1602 | /* strcat (p, q) can be transformed into | |
1603 | tmp = p + strlen (p); endptr = strpcpy (tmp, q); | |
1604 | with length endptr - p if we need to compute the length | |
1605 | later on. Don't do this transformation if we don't need | |
1606 | it. */ | |
e79983f4 | 1607 | if (builtin_decl_implicit_p (BUILT_IN_STPCPY) && lhs == NULL_TREE) |
8b57bfeb JJ |
1608 | { |
1609 | if (didx == 0) | |
1610 | { | |
1611 | didx = new_stridx (dst); | |
1612 | if (didx == 0) | |
1613 | return; | |
1614 | } | |
1615 | if (dsi == NULL) | |
1616 | { | |
1617 | dsi = new_strinfo (dst, didx, NULL_TREE); | |
1618 | set_strinfo (didx, dsi); | |
1619 | find_equal_ptrs (dst, didx); | |
1620 | } | |
1621 | else | |
1622 | { | |
1623 | dsi = unshare_strinfo (dsi); | |
1624 | dsi->length = NULL_TREE; | |
1625 | dsi->next = 0; | |
1626 | dsi->endptr = NULL_TREE; | |
1627 | } | |
1628 | dsi->writable = true; | |
1629 | dsi->stmt = stmt; | |
1630 | dsi->dont_invalidate = true; | |
1631 | } | |
1632 | return; | |
1633 | } | |
1634 | ||
1635 | srclen = NULL_TREE; | |
1636 | si = NULL; | |
1637 | idx = get_stridx (src); | |
1638 | if (idx < 0) | |
1639 | srclen = build_int_cst (size_type_node, ~idx); | |
1640 | else if (idx > 0) | |
1641 | { | |
1642 | si = get_strinfo (idx); | |
1643 | if (si != NULL) | |
1644 | srclen = get_string_length (si); | |
1645 | } | |
1646 | ||
1647 | loc = gimple_location (stmt); | |
1648 | dstlen = dsi->length; | |
1649 | endptr = dsi->endptr; | |
1650 | ||
1651 | dsi = unshare_strinfo (dsi); | |
1652 | dsi->endptr = NULL_TREE; | |
1653 | dsi->stmt = NULL; | |
1654 | dsi->writable = true; | |
1655 | ||
1656 | if (srclen != NULL_TREE) | |
1657 | { | |
1658 | dsi->length = fold_build2_loc (loc, PLUS_EXPR, TREE_TYPE (dsi->length), | |
1659 | dsi->length, srclen); | |
1660 | adjust_related_strinfos (loc, dsi, srclen); | |
1661 | dsi->dont_invalidate = true; | |
1662 | } | |
1663 | else | |
1664 | { | |
1665 | dsi->length = NULL; | |
e79983f4 | 1666 | if (lhs == NULL_TREE && builtin_decl_implicit_p (BUILT_IN_STPCPY)) |
8b57bfeb JJ |
1667 | dsi->dont_invalidate = true; |
1668 | } | |
1669 | ||
1670 | if (si != NULL) | |
1671 | /* strcat src may not overlap dst, so src doesn't need to be | |
1672 | invalidated either. */ | |
1673 | si->dont_invalidate = true; | |
1674 | ||
1675 | /* For now. Could remove the lhs from the call and add | |
1676 | lhs = dst; afterwards. */ | |
1677 | if (lhs) | |
1678 | return; | |
1679 | ||
1680 | fn = NULL_TREE; | |
1681 | objsz = NULL_TREE; | |
1682 | switch (bcode) | |
1683 | { | |
1684 | case BUILT_IN_STRCAT: | |
f5fc4a04 | 1685 | case BUILT_IN_STRCAT_CHKP: |
8b57bfeb | 1686 | if (srclen != NULL_TREE) |
e79983f4 | 1687 | fn = builtin_decl_implicit (BUILT_IN_MEMCPY); |
8b57bfeb | 1688 | else |
e79983f4 | 1689 | fn = builtin_decl_implicit (BUILT_IN_STRCPY); |
8b57bfeb JJ |
1690 | break; |
1691 | case BUILT_IN_STRCAT_CHK: | |
f5fc4a04 | 1692 | case BUILT_IN_STRCAT_CHK_CHKP: |
8b57bfeb | 1693 | if (srclen != NULL_TREE) |
e79983f4 | 1694 | fn = builtin_decl_explicit (BUILT_IN_MEMCPY_CHK); |
8b57bfeb | 1695 | else |
e79983f4 | 1696 | fn = builtin_decl_explicit (BUILT_IN_STRCPY_CHK); |
f5fc4a04 | 1697 | objsz = gimple_call_arg (stmt, with_bounds ? 4 : 2); |
8b57bfeb JJ |
1698 | break; |
1699 | default: | |
1700 | gcc_unreachable (); | |
1701 | } | |
1702 | ||
1703 | if (fn == NULL_TREE) | |
1704 | return; | |
1705 | ||
1706 | len = NULL_TREE; | |
1707 | if (srclen != NULL_TREE) | |
1708 | { | |
1709 | args = TYPE_ARG_TYPES (TREE_TYPE (fn)); | |
1710 | type = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (args))); | |
1711 | ||
1712 | len = fold_convert_loc (loc, type, unshare_expr (srclen)); | |
1713 | len = fold_build2_loc (loc, PLUS_EXPR, type, len, | |
1714 | build_int_cst (type, 1)); | |
1715 | len = force_gimple_operand_gsi (gsi, len, true, NULL_TREE, true, | |
1716 | GSI_SAME_STMT); | |
1717 | } | |
1718 | if (endptr) | |
1719 | dst = fold_convert_loc (loc, TREE_TYPE (dst), unshare_expr (endptr)); | |
1720 | else | |
1721 | dst = fold_build2_loc (loc, POINTER_PLUS_EXPR, | |
1722 | TREE_TYPE (dst), unshare_expr (dst), | |
1723 | fold_convert_loc (loc, sizetype, | |
1724 | unshare_expr (dstlen))); | |
1725 | dst = force_gimple_operand_gsi (gsi, dst, true, NULL_TREE, true, | |
1726 | GSI_SAME_STMT); | |
1727 | if (dump_file && (dump_flags & TDF_DETAILS) != 0) | |
1728 | { | |
1729 | fprintf (dump_file, "Optimizing: "); | |
1730 | print_gimple_stmt (dump_file, stmt, 0, TDF_SLIM); | |
1731 | } | |
f5fc4a04 IE |
1732 | if (with_bounds) |
1733 | { | |
1734 | fn = chkp_maybe_create_clone (fn)->decl; | |
1735 | if (srclen != NULL_TREE) | |
1736 | success = update_gimple_call (gsi, fn, 5 + (objsz != NULL_TREE), | |
1737 | dst, | |
1738 | gimple_call_arg (stmt, 1), | |
1739 | src, | |
1740 | gimple_call_arg (stmt, 3), | |
1741 | len, objsz); | |
1742 | else | |
1743 | success = update_gimple_call (gsi, fn, 4 + (objsz != NULL_TREE), | |
1744 | dst, | |
1745 | gimple_call_arg (stmt, 1), | |
1746 | src, | |
1747 | gimple_call_arg (stmt, 3), | |
1748 | objsz); | |
1749 | } | |
8b57bfeb | 1750 | else |
f5fc4a04 IE |
1751 | if (srclen != NULL_TREE) |
1752 | success = update_gimple_call (gsi, fn, 3 + (objsz != NULL_TREE), | |
1753 | dst, src, len, objsz); | |
1754 | else | |
1755 | success = update_gimple_call (gsi, fn, 2 + (objsz != NULL_TREE), | |
1756 | dst, src, objsz); | |
8b57bfeb JJ |
1757 | if (success) |
1758 | { | |
1759 | stmt = gsi_stmt (*gsi); | |
f5fc4a04 | 1760 | gimple_call_set_with_bounds (stmt, with_bounds); |
8b57bfeb JJ |
1761 | update_stmt (stmt); |
1762 | if (dump_file && (dump_flags & TDF_DETAILS) != 0) | |
1763 | { | |
1764 | fprintf (dump_file, "into: "); | |
1765 | print_gimple_stmt (dump_file, stmt, 0, TDF_SLIM); | |
1766 | } | |
1767 | /* If srclen == NULL, note that current string length can be | |
1768 | computed by transforming this strcpy into stpcpy. */ | |
1769 | if (srclen == NULL_TREE && dsi->dont_invalidate) | |
1770 | dsi->stmt = stmt; | |
1771 | adjust_last_stmt (dsi, stmt, true); | |
1772 | if (srclen != NULL_TREE) | |
1773 | { | |
1774 | laststmt.stmt = stmt; | |
1775 | laststmt.len = srclen; | |
1776 | laststmt.stridx = dsi->idx; | |
1777 | } | |
1778 | } | |
1779 | else if (dump_file && (dump_flags & TDF_DETAILS) != 0) | |
1780 | fprintf (dump_file, "not possible.\n"); | |
1781 | } | |
1782 | ||
24314386 MG |
1783 | /* Handle a call to malloc or calloc. */ |
1784 | ||
1785 | static void | |
1786 | handle_builtin_malloc (enum built_in_function bcode, gimple_stmt_iterator *gsi) | |
1787 | { | |
1788 | gimple stmt = gsi_stmt (*gsi); | |
1789 | tree lhs = gimple_call_lhs (stmt); | |
1790 | gcc_assert (get_stridx (lhs) == 0); | |
1791 | int idx = new_stridx (lhs); | |
1792 | tree length = NULL_TREE; | |
1793 | if (bcode == BUILT_IN_CALLOC) | |
1794 | length = build_int_cst (size_type_node, 0); | |
1795 | strinfo si = new_strinfo (lhs, idx, length); | |
1796 | if (bcode == BUILT_IN_CALLOC) | |
1797 | si->endptr = lhs; | |
1798 | set_strinfo (idx, si); | |
1799 | si->writable = true; | |
1800 | si->stmt = stmt; | |
1801 | si->dont_invalidate = true; | |
1802 | } | |
1803 | ||
1804 | /* Handle a call to memset. | |
1805 | After a call to calloc, memset(,0,) is unnecessary. | |
1806 | memset(malloc(n),0,n) is calloc(n,1). */ | |
1807 | ||
1808 | static bool | |
1809 | handle_builtin_memset (gimple_stmt_iterator *gsi) | |
1810 | { | |
1811 | gimple stmt2 = gsi_stmt (*gsi); | |
1812 | if (!integer_zerop (gimple_call_arg (stmt2, 1))) | |
1813 | return true; | |
1814 | tree ptr = gimple_call_arg (stmt2, 0); | |
1815 | int idx1 = get_stridx (ptr); | |
1816 | if (idx1 <= 0) | |
1817 | return true; | |
1818 | strinfo si1 = get_strinfo (idx1); | |
1819 | if (!si1) | |
1820 | return true; | |
1821 | gimple stmt1 = si1->stmt; | |
1822 | if (!stmt1 || !is_gimple_call (stmt1)) | |
1823 | return true; | |
1824 | tree callee1 = gimple_call_fndecl (stmt1); | |
1825 | if (!gimple_call_builtin_p (stmt1, BUILT_IN_NORMAL)) | |
1826 | return true; | |
1827 | enum built_in_function code1 = DECL_FUNCTION_CODE (callee1); | |
1828 | tree size = gimple_call_arg (stmt2, 2); | |
1829 | if (code1 == BUILT_IN_CALLOC) | |
1830 | /* Not touching stmt1 */ ; | |
1831 | else if (code1 == BUILT_IN_MALLOC | |
1832 | && operand_equal_p (gimple_call_arg (stmt1, 0), size, 0)) | |
1833 | { | |
1834 | gimple_stmt_iterator gsi1 = gsi_for_stmt (stmt1); | |
1835 | update_gimple_call (&gsi1, builtin_decl_implicit (BUILT_IN_CALLOC), 2, | |
1836 | size, build_one_cst (size_type_node)); | |
20cb2258 MG |
1837 | si1->length = build_int_cst (size_type_node, 0); |
1838 | si1->stmt = gsi_stmt (gsi1); | |
24314386 MG |
1839 | } |
1840 | else | |
1841 | return true; | |
1842 | tree lhs = gimple_call_lhs (stmt2); | |
1843 | unlink_stmt_vdef (stmt2); | |
1844 | if (lhs) | |
1845 | { | |
1846 | gimple assign = gimple_build_assign (lhs, ptr); | |
1847 | gsi_replace (gsi, assign, false); | |
1848 | } | |
1849 | else | |
1850 | { | |
1851 | gsi_remove (gsi, true); | |
1852 | release_defs (stmt2); | |
1853 | } | |
1854 | ||
1855 | return false; | |
1856 | } | |
1857 | ||
8b57bfeb JJ |
1858 | /* Handle a POINTER_PLUS_EXPR statement. |
1859 | For p = "abcd" + 2; compute associated length, or if | |
1860 | p = q + off is pointing to a '\0' character of a string, call | |
1861 | zero_length_string on it. */ | |
1862 | ||
1863 | static void | |
1864 | handle_pointer_plus (gimple_stmt_iterator *gsi) | |
1865 | { | |
1866 | gimple stmt = gsi_stmt (*gsi); | |
1867 | tree lhs = gimple_assign_lhs (stmt), off; | |
1868 | int idx = get_stridx (gimple_assign_rhs1 (stmt)); | |
1869 | strinfo si, zsi; | |
1870 | ||
1871 | if (idx == 0) | |
1872 | return; | |
1873 | ||
1874 | if (idx < 0) | |
1875 | { | |
1876 | tree off = gimple_assign_rhs2 (stmt); | |
cc269bb6 | 1877 | if (tree_fits_uhwi_p (off) |
7d362f6c | 1878 | && tree_to_uhwi (off) <= (unsigned HOST_WIDE_INT) ~idx) |
9771b263 | 1879 | ssa_ver_to_stridx[SSA_NAME_VERSION (lhs)] |
ae7e9ddd | 1880 | = ~(~idx - (int) tree_to_uhwi (off)); |
8b57bfeb JJ |
1881 | return; |
1882 | } | |
1883 | ||
1884 | si = get_strinfo (idx); | |
1885 | if (si == NULL || si->length == NULL_TREE) | |
1886 | return; | |
1887 | ||
1888 | off = gimple_assign_rhs2 (stmt); | |
1889 | zsi = NULL; | |
1890 | if (operand_equal_p (si->length, off, 0)) | |
1891 | zsi = zero_length_string (lhs, si); | |
1892 | else if (TREE_CODE (off) == SSA_NAME) | |
1893 | { | |
1894 | gimple def_stmt = SSA_NAME_DEF_STMT (off); | |
1895 | if (gimple_assign_single_p (def_stmt) | |
1896 | && operand_equal_p (si->length, gimple_assign_rhs1 (def_stmt), 0)) | |
1897 | zsi = zero_length_string (lhs, si); | |
1898 | } | |
1899 | if (zsi != NULL | |
1900 | && si->endptr != NULL_TREE | |
1901 | && si->endptr != lhs | |
1902 | && TREE_CODE (si->endptr) == SSA_NAME) | |
1903 | { | |
1904 | enum tree_code rhs_code | |
1905 | = useless_type_conversion_p (TREE_TYPE (lhs), TREE_TYPE (si->endptr)) | |
1906 | ? SSA_NAME : NOP_EXPR; | |
00d66391 | 1907 | gimple_assign_set_rhs_with_ops (gsi, rhs_code, si->endptr); |
8b57bfeb JJ |
1908 | gcc_assert (gsi_stmt (*gsi) == stmt); |
1909 | update_stmt (stmt); | |
1910 | } | |
1911 | } | |
1912 | ||
1913 | /* Handle a single character store. */ | |
1914 | ||
1915 | static bool | |
1916 | handle_char_store (gimple_stmt_iterator *gsi) | |
1917 | { | |
1918 | int idx = -1; | |
1919 | strinfo si = NULL; | |
1920 | gimple stmt = gsi_stmt (*gsi); | |
1921 | tree ssaname = NULL_TREE, lhs = gimple_assign_lhs (stmt); | |
1922 | ||
1923 | if (TREE_CODE (lhs) == MEM_REF | |
1924 | && TREE_CODE (TREE_OPERAND (lhs, 0)) == SSA_NAME) | |
1925 | { | |
1926 | if (integer_zerop (TREE_OPERAND (lhs, 1))) | |
1927 | { | |
1928 | ssaname = TREE_OPERAND (lhs, 0); | |
1929 | idx = get_stridx (ssaname); | |
1930 | } | |
1931 | } | |
1932 | else | |
1933 | idx = get_addr_stridx (lhs); | |
1934 | ||
1935 | if (idx > 0) | |
1936 | { | |
1937 | si = get_strinfo (idx); | |
1938 | if (si != NULL && si->length != NULL_TREE && integer_zerop (si->length)) | |
1939 | { | |
1940 | if (initializer_zerop (gimple_assign_rhs1 (stmt))) | |
1941 | { | |
1942 | /* When storing '\0', the store can be removed | |
1943 | if we know it has been stored in the current function. */ | |
1944 | if (!stmt_could_throw_p (stmt) && si->writable) | |
1945 | { | |
1946 | unlink_stmt_vdef (stmt); | |
1947 | release_defs (stmt); | |
1948 | gsi_remove (gsi, true); | |
1949 | return false; | |
1950 | } | |
1951 | else | |
1952 | { | |
1953 | si->writable = true; | |
5b115c1f MP |
1954 | gsi_next (gsi); |
1955 | return false; | |
8b57bfeb JJ |
1956 | } |
1957 | } | |
1958 | else | |
1959 | /* Otherwise this statement overwrites the '\0' with | |
1960 | something, if the previous stmt was a memcpy, | |
1961 | its length may be decreased. */ | |
1962 | adjust_last_stmt (si, stmt, false); | |
1963 | } | |
3a60f32b | 1964 | else if (si != NULL && integer_zerop (gimple_assign_rhs1 (stmt))) |
8b57bfeb JJ |
1965 | { |
1966 | si = unshare_strinfo (si); | |
1967 | si->length = build_int_cst (size_type_node, 0); | |
1968 | si->endptr = NULL; | |
1969 | si->prev = 0; | |
1970 | si->next = 0; | |
1971 | si->stmt = NULL; | |
1972 | si->first = 0; | |
1973 | si->writable = true; | |
1974 | if (ssaname && !SSA_NAME_OCCURS_IN_ABNORMAL_PHI (ssaname)) | |
1975 | si->endptr = ssaname; | |
1976 | si->dont_invalidate = true; | |
1977 | } | |
5b115c1f MP |
1978 | /* If si->length is non-zero constant, we aren't overwriting '\0', |
1979 | and if we aren't storing '\0', we know that the length of the | |
1980 | string and any other zero terminated string in memory remains | |
1981 | the same. In that case we move to the next gimple statement and | |
1982 | return to signal the caller that it shouldn't invalidate anything. | |
1983 | ||
1984 | This is benefical for cases like: | |
1985 | ||
1986 | char p[20]; | |
1987 | void foo (char *q) | |
1988 | { | |
1989 | strcpy (p, "foobar"); | |
1990 | size_t len = strlen (p); // This can be optimized into 6 | |
1991 | size_t len2 = strlen (q); // This has to be computed | |
1992 | p[0] = 'X'; | |
1993 | size_t len3 = strlen (p); // This can be optimized into 6 | |
1994 | size_t len4 = strlen (q); // This can be optimized into len2 | |
1995 | bar (len, len2, len3, len4); | |
1996 | } | |
1997 | */ | |
1998 | else if (si != NULL && si->length != NULL_TREE | |
1999 | && TREE_CODE (si->length) == INTEGER_CST | |
2000 | && integer_nonzerop (gimple_assign_rhs1 (stmt))) | |
2001 | { | |
2002 | gsi_next (gsi); | |
2003 | return false; | |
2004 | } | |
8b57bfeb JJ |
2005 | } |
2006 | else if (idx == 0 && initializer_zerop (gimple_assign_rhs1 (stmt))) | |
2007 | { | |
2008 | if (ssaname) | |
2009 | { | |
2010 | si = zero_length_string (ssaname, NULL); | |
2011 | if (si != NULL) | |
2012 | si->dont_invalidate = true; | |
2013 | } | |
2014 | else | |
2015 | { | |
2016 | int idx = new_addr_stridx (lhs); | |
2017 | if (idx != 0) | |
2018 | { | |
2019 | si = new_strinfo (build_fold_addr_expr (lhs), idx, | |
2020 | build_int_cst (size_type_node, 0)); | |
2021 | set_strinfo (idx, si); | |
2022 | si->dont_invalidate = true; | |
2023 | } | |
2024 | } | |
2025 | if (si != NULL) | |
2026 | si->writable = true; | |
2027 | } | |
198fe1bf JJ |
2028 | else if (idx == 0 |
2029 | && TREE_CODE (gimple_assign_rhs1 (stmt)) == STRING_CST | |
2030 | && ssaname == NULL_TREE | |
2031 | && TREE_CODE (TREE_TYPE (lhs)) == ARRAY_TYPE) | |
2032 | { | |
2033 | size_t l = strlen (TREE_STRING_POINTER (gimple_assign_rhs1 (stmt))); | |
2034 | HOST_WIDE_INT a = int_size_in_bytes (TREE_TYPE (lhs)); | |
2035 | if (a > 0 && (unsigned HOST_WIDE_INT) a > l) | |
2036 | { | |
2037 | int idx = new_addr_stridx (lhs); | |
2038 | if (idx != 0) | |
2039 | { | |
2040 | si = new_strinfo (build_fold_addr_expr (lhs), idx, | |
2041 | build_int_cst (size_type_node, l)); | |
2042 | set_strinfo (idx, si); | |
2043 | si->dont_invalidate = true; | |
2044 | } | |
2045 | } | |
2046 | } | |
8b57bfeb JJ |
2047 | |
2048 | if (si != NULL && initializer_zerop (gimple_assign_rhs1 (stmt))) | |
2049 | { | |
2050 | /* Allow adjust_last_stmt to remove it if the stored '\0' | |
2051 | is immediately overwritten. */ | |
2052 | laststmt.stmt = stmt; | |
2053 | laststmt.len = build_int_cst (size_type_node, 1); | |
2054 | laststmt.stridx = si->idx; | |
2055 | } | |
2056 | return true; | |
2057 | } | |
2058 | ||
2059 | /* Attempt to optimize a single statement at *GSI using string length | |
2060 | knowledge. */ | |
2061 | ||
2062 | static bool | |
2063 | strlen_optimize_stmt (gimple_stmt_iterator *gsi) | |
2064 | { | |
2065 | gimple stmt = gsi_stmt (*gsi); | |
2066 | ||
2067 | if (is_gimple_call (stmt)) | |
2068 | { | |
2069 | tree callee = gimple_call_fndecl (stmt); | |
3626621a | 2070 | if (gimple_call_builtin_p (stmt, BUILT_IN_NORMAL)) |
8b57bfeb JJ |
2071 | switch (DECL_FUNCTION_CODE (callee)) |
2072 | { | |
2073 | case BUILT_IN_STRLEN: | |
f5fc4a04 | 2074 | case BUILT_IN_STRLEN_CHKP: |
8b57bfeb JJ |
2075 | handle_builtin_strlen (gsi); |
2076 | break; | |
2077 | case BUILT_IN_STRCHR: | |
f5fc4a04 | 2078 | case BUILT_IN_STRCHR_CHKP: |
8b57bfeb JJ |
2079 | handle_builtin_strchr (gsi); |
2080 | break; | |
2081 | case BUILT_IN_STRCPY: | |
2082 | case BUILT_IN_STRCPY_CHK: | |
2083 | case BUILT_IN_STPCPY: | |
2084 | case BUILT_IN_STPCPY_CHK: | |
f5fc4a04 IE |
2085 | case BUILT_IN_STRCPY_CHKP: |
2086 | case BUILT_IN_STRCPY_CHK_CHKP: | |
2087 | case BUILT_IN_STPCPY_CHKP: | |
2088 | case BUILT_IN_STPCPY_CHK_CHKP: | |
8b57bfeb JJ |
2089 | handle_builtin_strcpy (DECL_FUNCTION_CODE (callee), gsi); |
2090 | break; | |
2091 | case BUILT_IN_MEMCPY: | |
2092 | case BUILT_IN_MEMCPY_CHK: | |
2093 | case BUILT_IN_MEMPCPY: | |
2094 | case BUILT_IN_MEMPCPY_CHK: | |
f5fc4a04 IE |
2095 | case BUILT_IN_MEMCPY_CHKP: |
2096 | case BUILT_IN_MEMCPY_CHK_CHKP: | |
2097 | case BUILT_IN_MEMPCPY_CHKP: | |
2098 | case BUILT_IN_MEMPCPY_CHK_CHKP: | |
8b57bfeb JJ |
2099 | handle_builtin_memcpy (DECL_FUNCTION_CODE (callee), gsi); |
2100 | break; | |
2101 | case BUILT_IN_STRCAT: | |
2102 | case BUILT_IN_STRCAT_CHK: | |
f5fc4a04 IE |
2103 | case BUILT_IN_STRCAT_CHKP: |
2104 | case BUILT_IN_STRCAT_CHK_CHKP: | |
8b57bfeb JJ |
2105 | handle_builtin_strcat (DECL_FUNCTION_CODE (callee), gsi); |
2106 | break; | |
24314386 MG |
2107 | case BUILT_IN_MALLOC: |
2108 | case BUILT_IN_CALLOC: | |
2109 | handle_builtin_malloc (DECL_FUNCTION_CODE (callee), gsi); | |
2110 | break; | |
2111 | case BUILT_IN_MEMSET: | |
2112 | if (!handle_builtin_memset (gsi)) | |
2113 | return false; | |
2114 | break; | |
8b57bfeb JJ |
2115 | default: |
2116 | break; | |
2117 | } | |
2118 | } | |
5004bd00 | 2119 | else if (is_gimple_assign (stmt) && !gimple_clobber_p (stmt)) |
8b57bfeb JJ |
2120 | { |
2121 | tree lhs = gimple_assign_lhs (stmt); | |
2122 | ||
2123 | if (TREE_CODE (lhs) == SSA_NAME && POINTER_TYPE_P (TREE_TYPE (lhs))) | |
2124 | { | |
2125 | if (gimple_assign_single_p (stmt) | |
2126 | || (gimple_assign_cast_p (stmt) | |
2127 | && POINTER_TYPE_P (TREE_TYPE (gimple_assign_rhs1 (stmt))))) | |
2128 | { | |
2129 | int idx = get_stridx (gimple_assign_rhs1 (stmt)); | |
9771b263 | 2130 | ssa_ver_to_stridx[SSA_NAME_VERSION (lhs)] = idx; |
8b57bfeb JJ |
2131 | } |
2132 | else if (gimple_assign_rhs_code (stmt) == POINTER_PLUS_EXPR) | |
2133 | handle_pointer_plus (gsi); | |
2134 | } | |
2135 | else if (TREE_CODE (lhs) != SSA_NAME && !TREE_SIDE_EFFECTS (lhs)) | |
2136 | { | |
2137 | tree type = TREE_TYPE (lhs); | |
2138 | if (TREE_CODE (type) == ARRAY_TYPE) | |
2139 | type = TREE_TYPE (type); | |
2140 | if (TREE_CODE (type) == INTEGER_TYPE | |
2141 | && TYPE_MODE (type) == TYPE_MODE (char_type_node) | |
2142 | && TYPE_PRECISION (type) == TYPE_PRECISION (char_type_node)) | |
2143 | { | |
2144 | if (! handle_char_store (gsi)) | |
2145 | return false; | |
2146 | } | |
2147 | } | |
2148 | } | |
2149 | ||
2150 | if (gimple_vdef (stmt)) | |
2151 | maybe_invalidate (stmt); | |
2152 | return true; | |
2153 | } | |
2154 | ||
2155 | /* Recursively call maybe_invalidate on stmts that might be executed | |
2156 | in between dombb and current bb and that contain a vdef. Stop when | |
2157 | *count stmts are inspected, or if the whole strinfo vector has | |
2158 | been invalidated. */ | |
2159 | ||
2160 | static void | |
2161 | do_invalidate (basic_block dombb, gimple phi, bitmap visited, int *count) | |
2162 | { | |
2163 | unsigned int i, n = gimple_phi_num_args (phi); | |
2164 | ||
2165 | for (i = 0; i < n; i++) | |
2166 | { | |
2167 | tree vuse = gimple_phi_arg_def (phi, i); | |
2168 | gimple stmt = SSA_NAME_DEF_STMT (vuse); | |
2169 | basic_block bb = gimple_bb (stmt); | |
2170 | if (bb == NULL | |
2171 | || bb == dombb | |
2172 | || !bitmap_set_bit (visited, bb->index) | |
2173 | || !dominated_by_p (CDI_DOMINATORS, bb, dombb)) | |
2174 | continue; | |
2175 | while (1) | |
2176 | { | |
2177 | if (gimple_code (stmt) == GIMPLE_PHI) | |
2178 | { | |
2179 | do_invalidate (dombb, stmt, visited, count); | |
2180 | if (*count == 0) | |
2181 | return; | |
2182 | break; | |
2183 | } | |
2184 | if (--*count == 0) | |
2185 | return; | |
2186 | if (!maybe_invalidate (stmt)) | |
2187 | { | |
2188 | *count = 0; | |
2189 | return; | |
2190 | } | |
2191 | vuse = gimple_vuse (stmt); | |
2192 | stmt = SSA_NAME_DEF_STMT (vuse); | |
2193 | if (gimple_bb (stmt) != bb) | |
2194 | { | |
2195 | bb = gimple_bb (stmt); | |
2196 | if (bb == NULL | |
2197 | || bb == dombb | |
2198 | || !bitmap_set_bit (visited, bb->index) | |
2199 | || !dominated_by_p (CDI_DOMINATORS, bb, dombb)) | |
2200 | break; | |
2201 | } | |
2202 | } | |
2203 | } | |
2204 | } | |
2205 | ||
4d9192b5 TS |
2206 | class strlen_dom_walker : public dom_walker |
2207 | { | |
2208 | public: | |
2209 | strlen_dom_walker (cdi_direction direction) : dom_walker (direction) {} | |
2210 | ||
2211 | virtual void before_dom_children (basic_block); | |
2212 | virtual void after_dom_children (basic_block); | |
2213 | }; | |
2214 | ||
8b57bfeb JJ |
2215 | /* Callback for walk_dominator_tree. Attempt to optimize various |
2216 | string ops by remembering string lenths pointed by pointer SSA_NAMEs. */ | |
2217 | ||
4d9192b5 TS |
2218 | void |
2219 | strlen_dom_walker::before_dom_children (basic_block bb) | |
8b57bfeb | 2220 | { |
8b57bfeb JJ |
2221 | basic_block dombb = get_immediate_dominator (CDI_DOMINATORS, bb); |
2222 | ||
2223 | if (dombb == NULL) | |
2224 | stridx_to_strinfo = NULL; | |
2225 | else | |
2226 | { | |
9771b263 | 2227 | stridx_to_strinfo = ((vec<strinfo, va_heap, vl_embed> *) dombb->aux); |
8b57bfeb JJ |
2228 | if (stridx_to_strinfo) |
2229 | { | |
538dd0b7 DM |
2230 | for (gphi_iterator gsi = gsi_start_phis (bb); !gsi_end_p (gsi); |
2231 | gsi_next (&gsi)) | |
8b57bfeb | 2232 | { |
538dd0b7 | 2233 | gphi *phi = gsi.phi (); |
ea057359 | 2234 | if (virtual_operand_p (gimple_phi_result (phi))) |
8b57bfeb JJ |
2235 | { |
2236 | bitmap visited = BITMAP_ALLOC (NULL); | |
2237 | int count_vdef = 100; | |
2238 | do_invalidate (dombb, phi, visited, &count_vdef); | |
2239 | BITMAP_FREE (visited); | |
8b29fd4e JJ |
2240 | if (count_vdef == 0) |
2241 | { | |
2242 | /* If there were too many vdefs in between immediate | |
2243 | dominator and current bb, invalidate everything. | |
2244 | If stridx_to_strinfo has been unshared, we need | |
2245 | to free it, otherwise just set it to NULL. */ | |
2246 | if (!strinfo_shared ()) | |
2247 | { | |
2248 | unsigned int i; | |
2249 | strinfo si; | |
2250 | ||
2251 | for (i = 1; | |
2252 | vec_safe_iterate (stridx_to_strinfo, i, &si); | |
2253 | ++i) | |
2254 | { | |
2255 | free_strinfo (si); | |
2256 | (*stridx_to_strinfo)[i] = NULL; | |
2257 | } | |
2258 | } | |
2259 | else | |
2260 | stridx_to_strinfo = NULL; | |
2261 | } | |
8b57bfeb JJ |
2262 | break; |
2263 | } | |
2264 | } | |
2265 | } | |
2266 | } | |
2267 | ||
2268 | /* If all PHI arguments have the same string index, the PHI result | |
2269 | has it as well. */ | |
538dd0b7 DM |
2270 | for (gphi_iterator gsi = gsi_start_phis (bb); !gsi_end_p (gsi); |
2271 | gsi_next (&gsi)) | |
8b57bfeb | 2272 | { |
538dd0b7 | 2273 | gphi *phi = gsi.phi (); |
8b57bfeb | 2274 | tree result = gimple_phi_result (phi); |
ea057359 | 2275 | if (!virtual_operand_p (result) && POINTER_TYPE_P (TREE_TYPE (result))) |
8b57bfeb JJ |
2276 | { |
2277 | int idx = get_stridx (gimple_phi_arg_def (phi, 0)); | |
2278 | if (idx != 0) | |
2279 | { | |
2280 | unsigned int i, n = gimple_phi_num_args (phi); | |
2281 | for (i = 1; i < n; i++) | |
2282 | if (idx != get_stridx (gimple_phi_arg_def (phi, i))) | |
2283 | break; | |
2284 | if (i == n) | |
9771b263 | 2285 | ssa_ver_to_stridx[SSA_NAME_VERSION (result)] = idx; |
8b57bfeb JJ |
2286 | } |
2287 | } | |
2288 | } | |
2289 | ||
2290 | /* Attempt to optimize individual statements. */ | |
538dd0b7 | 2291 | for (gimple_stmt_iterator gsi = gsi_start_bb (bb); !gsi_end_p (gsi); ) |
8b57bfeb JJ |
2292 | if (strlen_optimize_stmt (&gsi)) |
2293 | gsi_next (&gsi); | |
2294 | ||
2295 | bb->aux = stridx_to_strinfo; | |
9771b263 DN |
2296 | if (vec_safe_length (stridx_to_strinfo) && !strinfo_shared ()) |
2297 | (*stridx_to_strinfo)[0] = (strinfo) bb; | |
8b57bfeb JJ |
2298 | } |
2299 | ||
2300 | /* Callback for walk_dominator_tree. Free strinfo vector if it is | |
2301 | owned by the current bb, clear bb->aux. */ | |
2302 | ||
4d9192b5 TS |
2303 | void |
2304 | strlen_dom_walker::after_dom_children (basic_block bb) | |
8b57bfeb JJ |
2305 | { |
2306 | if (bb->aux) | |
2307 | { | |
9771b263 DN |
2308 | stridx_to_strinfo = ((vec<strinfo, va_heap, vl_embed> *) bb->aux); |
2309 | if (vec_safe_length (stridx_to_strinfo) | |
2310 | && (*stridx_to_strinfo)[0] == (strinfo) bb) | |
8b57bfeb JJ |
2311 | { |
2312 | unsigned int i; | |
2313 | strinfo si; | |
2314 | ||
9771b263 | 2315 | for (i = 1; vec_safe_iterate (stridx_to_strinfo, i, &si); ++i) |
8b57bfeb | 2316 | free_strinfo (si); |
9771b263 | 2317 | vec_free (stridx_to_strinfo); |
8b57bfeb JJ |
2318 | } |
2319 | bb->aux = NULL; | |
2320 | } | |
2321 | } | |
2322 | ||
2323 | /* Main entry point. */ | |
2324 | ||
27a4cd48 DM |
2325 | namespace { |
2326 | ||
2327 | const pass_data pass_data_strlen = | |
8b57bfeb | 2328 | { |
27a4cd48 DM |
2329 | GIMPLE_PASS, /* type */ |
2330 | "strlen", /* name */ | |
2331 | OPTGROUP_NONE, /* optinfo_flags */ | |
27a4cd48 DM |
2332 | TV_TREE_STRLEN, /* tv_id */ |
2333 | ( PROP_cfg | PROP_ssa ), /* properties_required */ | |
2334 | 0, /* properties_provided */ | |
2335 | 0, /* properties_destroyed */ | |
2336 | 0, /* todo_flags_start */ | |
3bea341f | 2337 | 0, /* todo_flags_finish */ |
8b57bfeb | 2338 | }; |
27a4cd48 DM |
2339 | |
2340 | class pass_strlen : public gimple_opt_pass | |
2341 | { | |
2342 | public: | |
c3284718 RS |
2343 | pass_strlen (gcc::context *ctxt) |
2344 | : gimple_opt_pass (pass_data_strlen, ctxt) | |
27a4cd48 DM |
2345 | {} |
2346 | ||
2347 | /* opt_pass methods: */ | |
1a3d085c | 2348 | virtual bool gate (function *) { return flag_optimize_strlen != 0; } |
be55bfe6 | 2349 | virtual unsigned int execute (function *); |
27a4cd48 DM |
2350 | |
2351 | }; // class pass_strlen | |
2352 | ||
be55bfe6 TS |
2353 | unsigned int |
2354 | pass_strlen::execute (function *fun) | |
2355 | { | |
2356 | ssa_ver_to_stridx.safe_grow_cleared (num_ssa_names); | |
2357 | max_stridx = 1; | |
be55bfe6 TS |
2358 | |
2359 | calculate_dominance_info (CDI_DOMINATORS); | |
2360 | ||
2361 | /* String length optimization is implemented as a walk of the dominator | |
2362 | tree and a forward walk of statements within each block. */ | |
2363 | strlen_dom_walker (CDI_DOMINATORS).walk (fun->cfg->x_entry_block_ptr); | |
2364 | ||
2365 | ssa_ver_to_stridx.release (); | |
33e7d32e | 2366 | strinfo_pool.release (); |
c203e8a7 | 2367 | if (decl_to_stridxlist_htab) |
be55bfe6 TS |
2368 | { |
2369 | obstack_free (&stridx_obstack, NULL); | |
c203e8a7 TS |
2370 | delete decl_to_stridxlist_htab; |
2371 | decl_to_stridxlist_htab = NULL; | |
be55bfe6 TS |
2372 | } |
2373 | laststmt.stmt = NULL; | |
2374 | laststmt.len = NULL_TREE; | |
2375 | laststmt.stridx = 0; | |
2376 | ||
2377 | return 0; | |
2378 | } | |
2379 | ||
27a4cd48 DM |
2380 | } // anon namespace |
2381 | ||
2382 | gimple_opt_pass * | |
2383 | make_pass_strlen (gcc::context *ctxt) | |
2384 | { | |
2385 | return new pass_strlen (ctxt); | |
2386 | } |