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12166 resync smatch to 0.6.1-rc1-il-3
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--- old/usr/src/tools/smatch/src/smatch_function_hooks.c
+++ new/usr/src/tools/smatch/src/smatch_function_hooks.c
1 1 /*
2 2 * Copyright (C) 2009 Dan Carpenter.
3 3 *
4 4 * This program is free software; you can redistribute it and/or
5 5 * modify it under the terms of the GNU General Public License
6 6 * as published by the Free Software Foundation; either version 2
7 7 * of the License, or (at your option) any later version.
8 8 *
9 9 * This program is distributed in the hope that it will be useful,
10 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 12 * GNU General Public License for more details.
13 13 *
14 14 * You should have received a copy of the GNU General Public License
15 15 * along with this program; if not, see http://www.gnu.org/copyleft/gpl.txt
16 16 */
17 17
18 18 /*
19 19 * There are several types of function hooks:
20 20 * add_function_hook() - For any time a function is called.
21 21 * add_function_assign_hook() - foo = the_function().
22 22 * add_implied_return_hook() - Calculates the implied return value.
23 23 * add_macro_assign_hook() - foo = the_macro().
24 24 * return_implies_state() - For when a return value of 1 implies locked
25 25 * and 0 implies unlocked. etc. etc.
26 26 *
27 27 */
28 28
29 29 #include <stdlib.h>
30 30 #include <stdio.h>
31 31 #include "smatch.h"
32 32 #include "smatch_slist.h"
33 33 #include "smatch_extra.h"
34 34 #include "smatch_function_hashtable.h"
35 35
36 36 struct fcall_back {
37 37 int type;
38 38 struct data_range *range;
39 39 union {
40 40 func_hook *call_back;
41 41 implication_hook *ranged;
42 42 implied_return_hook *implied_return;
43 43 } u;
44 44 void *info;
45 45 };
46 46
47 47 ALLOCATOR(fcall_back, "call backs");
48 48 DECLARE_PTR_LIST(call_back_list, struct fcall_back);
49 49
50 50 DEFINE_FUNCTION_HASHTABLE_STATIC(callback, struct fcall_back, struct call_back_list);
51 51 static struct hashtable *func_hash;
52 52
53 53 int __in_fake_parameter_assign;
54 54
55 55 #define REGULAR_CALL 0
56 56 #define RANGED_CALL 1
57 57 #define ASSIGN_CALL 2
58 58 #define IMPLIED_RETURN 3
59 59 #define MACRO_ASSIGN 4
60 60 #define MACRO_ASSIGN_EXTRA 5
61 61
62 62 struct return_implies_callback {
63 63 int type;
64 64 return_implies_hook *callback;
65 65 };
66 66 ALLOCATOR(return_implies_callback, "return_implies callbacks");
67 67 DECLARE_PTR_LIST(db_implies_list, struct return_implies_callback);
68 68 static struct db_implies_list *db_return_states_list;
69 69
70 70 typedef void (void_fn)(void);
71 71 DECLARE_PTR_LIST(void_fn_list, void_fn *);
72 72 static struct void_fn_list *return_states_before;
73 73 static struct void_fn_list *return_states_after;
74 74
75 75 static struct fcall_back *alloc_fcall_back(int type, void *call_back,
76 76 void *info)
77 77 {
78 78 struct fcall_back *cb;
79 79
80 80 cb = __alloc_fcall_back(0);
81 81 cb->type = type;
82 82 cb->u.call_back = call_back;
83 83 cb->info = info;
84 84 return cb;
85 85 }
86 86
87 87 void add_function_hook(const char *look_for, func_hook *call_back, void *info)
88 88 {
89 89 struct fcall_back *cb;
90 90
91 91 cb = alloc_fcall_back(REGULAR_CALL, call_back, info);
92 92 add_callback(func_hash, look_for, cb);
93 93 }
94 94
95 95 void add_function_assign_hook(const char *look_for, func_hook *call_back,
96 96 void *info)
97 97 {
98 98 struct fcall_back *cb;
99 99
100 100 cb = alloc_fcall_back(ASSIGN_CALL, call_back, info);
101 101 add_callback(func_hash, look_for, cb);
102 102 }
103 103
104 104 void add_implied_return_hook(const char *look_for,
105 105 implied_return_hook *call_back,
106 106 void *info)
107 107 {
108 108 struct fcall_back *cb;
109 109
110 110 cb = alloc_fcall_back(IMPLIED_RETURN, call_back, info);
111 111 add_callback(func_hash, look_for, cb);
112 112 }
113 113
114 114 void add_macro_assign_hook(const char *look_for, func_hook *call_back,
115 115 void *info)
116 116 {
117 117 struct fcall_back *cb;
118 118
119 119 cb = alloc_fcall_back(MACRO_ASSIGN, call_back, info);
120 120 add_callback(func_hash, look_for, cb);
121 121 }
122 122
123 123 void add_macro_assign_hook_extra(const char *look_for, func_hook *call_back,
124 124 void *info)
125 125 {
126 126 struct fcall_back *cb;
127 127
128 128 cb = alloc_fcall_back(MACRO_ASSIGN_EXTRA, call_back, info);
129 129 add_callback(func_hash, look_for, cb);
130 130 }
131 131
132 132 void return_implies_state(const char *look_for, long long start, long long end,
133 133 implication_hook *call_back, void *info)
134 134 {
135 135 struct fcall_back *cb;
136 136
137 137 cb = alloc_fcall_back(RANGED_CALL, call_back, info);
138 138 cb->range = alloc_range_perm(ll_to_sval(start), ll_to_sval(end));
139 139 add_callback(func_hash, look_for, cb);
140 140 }
141 141
142 142 void return_implies_state_sval(const char *look_for, sval_t start, sval_t end,
143 143 implication_hook *call_back, void *info)
144 144 {
145 145 struct fcall_back *cb;
146 146
147 147 cb = alloc_fcall_back(RANGED_CALL, call_back, info);
148 148 cb->range = alloc_range_perm(start, end);
149 149 add_callback(func_hash, look_for, cb);
150 150 }
151 151
152 152 void select_return_states_hook(int type, return_implies_hook *callback)
153 153 {
154 154 struct return_implies_callback *cb = __alloc_return_implies_callback(0);
155 155
156 156 cb->type = type;
157 157 cb->callback = callback;
158 158 add_ptr_list(&db_return_states_list, cb);
159 159 }
160 160
161 161 void select_return_states_before(void_fn *fn)
162 162 {
163 163 void_fn **p = malloc(sizeof(void_fn *));
164 164 *p = fn;
165 165 add_ptr_list(&return_states_before, p);
166 166 }
167 167
168 168 void select_return_states_after(void_fn *fn)
169 169 {
170 170 void_fn **p = malloc(sizeof(void_fn *));
171 171 *p = fn;
172 172 add_ptr_list(&return_states_after, p);
173 173 }
174 174
175 175 static void call_return_states_before_hooks(void)
176 176 {
177 177 void_fn **fn;
178 178
179 179 FOR_EACH_PTR(return_states_before, fn) {
180 180 (*fn)();
181 181 } END_FOR_EACH_PTR(fn);
182 182 }
183 183
184 184 static void call_return_states_after_hooks(struct expression *expr)
185 185 {
186 186 void_fn **fn;
187 187
188 188 FOR_EACH_PTR(return_states_after, fn) {
189 189 (*fn)();
190 190 } END_FOR_EACH_PTR(fn);
191 191 __pass_to_client(expr, FUNCTION_CALL_HOOK_AFTER_DB);
192 192 }
193 193
194 194 static int call_call_backs(struct call_back_list *list, int type,
195 195 const char *fn, struct expression *expr)
196 196 {
197 197 struct fcall_back *tmp;
198 198 int handled = 0;
199 199
200 200 FOR_EACH_PTR(list, tmp) {
201 201 if (tmp->type == type) {
202 202 (tmp->u.call_back)(fn, expr, tmp->info);
203 203 handled = 1;
204 204 }
205 205 } END_FOR_EACH_PTR(tmp);
206 206
207 207 return handled;
208 208 }
209 209
210 210 static void call_ranged_call_backs(struct call_back_list *list,
211 211 const char *fn, struct expression *call_expr,
212 212 struct expression *assign_expr)
213 213 {
214 214 struct fcall_back *tmp;
215 215
216 216 FOR_EACH_PTR(list, tmp) {
217 217 (tmp->u.ranged)(fn, call_expr, assign_expr, tmp->info);
218 218 } END_FOR_EACH_PTR(tmp);
219 219 }
220 220
221 221 static struct call_back_list *get_same_ranged_call_backs(struct call_back_list *list,
222 222 struct data_range *drange)
223 223 {
224 224 struct call_back_list *ret = NULL;
225 225 struct fcall_back *tmp;
226 226
227 227 FOR_EACH_PTR(list, tmp) {
228 228 if (tmp->type != RANGED_CALL)
229 229 continue;
230 230 if (ranges_equiv(tmp->range, drange))
231 231 add_ptr_list(&ret, tmp);
232 232 } END_FOR_EACH_PTR(tmp);
233 233 return ret;
234 234 }
235 235
236 236 static int in_list_exact_sval(struct range_list *list, struct data_range *drange)
237 237 {
238 238 struct data_range *tmp;
239 239
240 240 FOR_EACH_PTR(list, tmp) {
241 241 if (ranges_equiv(tmp, drange))
242 242 return 1;
243 243 } END_FOR_EACH_PTR(tmp);
244 244 return 0;
245 245 }
246 246
247 247 static int assign_ranged_funcs(const char *fn, struct expression *expr,
248 248 struct call_back_list *call_backs)
249 249 {
250 250 struct fcall_back *tmp;
251 251 struct sm_state *sm;
252 252 char *var_name;
253 253 struct symbol *sym;
254 254 struct smatch_state *estate;
255 255 struct stree *tmp_stree;
256 256 struct stree *final_states = NULL;
257 257 struct range_list *handled_ranges = NULL;
258 258 struct call_back_list *same_range_call_backs = NULL;
259 259 struct range_list *rl;
260 260 int handled = 0;
261 261
262 262 if (!call_backs)
263 263 return 0;
264 264
265 265 var_name = expr_to_var_sym(expr->left, &sym);
266 266 if (!var_name || !sym)
267 267 goto free;
268 268
269 269 FOR_EACH_PTR(call_backs, tmp) {
270 270 if (tmp->type != RANGED_CALL)
271 271 continue;
272 272
273 273 if (in_list_exact_sval(handled_ranges, tmp->range))
274 274 continue;
275 275 __push_fake_cur_stree();
276 276 tack_on(&handled_ranges, tmp->range);
277 277
278 278 same_range_call_backs = get_same_ranged_call_backs(call_backs, tmp->range);
279 279 call_ranged_call_backs(same_range_call_backs, fn, expr->right, expr);
280 280 __free_ptr_list((struct ptr_list **)&same_range_call_backs);
281 281
282 282 rl = alloc_rl(tmp->range->min, tmp->range->max);
283 283 rl = cast_rl(get_type(expr->left), rl);
284 284 estate = alloc_estate_rl(rl);
285 285 set_extra_mod(var_name, sym, expr->left, estate);
286 286
287 287 tmp_stree = __pop_fake_cur_stree();
288 288 merge_fake_stree(&final_states, tmp_stree);
289 289 free_stree(&tmp_stree);
290 290 handled = 1;
291 291 } END_FOR_EACH_PTR(tmp);
292 292
293 293 FOR_EACH_SM(final_states, sm) {
294 294 __set_sm(sm);
295 295 } END_FOR_EACH_SM(sm);
296 296
297 297 free_stree(&final_states);
298 298 free:
299 299 free_string(var_name);
300 300 return handled;
301 301 }
302 302
303 303 static void call_implies_callbacks(int comparison, struct expression *expr, sval_t sval, int left, struct stree **implied_true, struct stree **implied_false)
304 304 {
305 305 struct call_back_list *call_backs;
306 306 struct fcall_back *tmp;
307 307 const char *fn;
308 308 struct data_range *value_range;
309 309 struct stree *true_states = NULL;
310 310 struct stree *false_states = NULL;
311 311 struct stree *tmp_stree;
312 312
313 313 *implied_true = NULL;
314 314 *implied_false = NULL;
315 315 if (expr->fn->type != EXPR_SYMBOL || !expr->fn->symbol)
316 316 return;
317 317 fn = expr->fn->symbol->ident->name;
318 318 call_backs = search_callback(func_hash, (char *)expr->fn->symbol->ident->name);
319 319 if (!call_backs)
320 320 return;
321 321 value_range = alloc_range(sval, sval);
322 322
323 323 /* set true states */
324 324 __push_fake_cur_stree();
325 325 FOR_EACH_PTR(call_backs, tmp) {
326 326 if (tmp->type != RANGED_CALL)
327 327 continue;
328 328 if (!true_comparison_range_LR(comparison, tmp->range, value_range, left))
329 329 continue;
330 330 (tmp->u.ranged)(fn, expr, NULL, tmp->info);
331 331 } END_FOR_EACH_PTR(tmp);
332 332 tmp_stree = __pop_fake_cur_stree();
333 333 merge_fake_stree(&true_states, tmp_stree);
334 334 free_stree(&tmp_stree);
335 335
336 336 /* set false states */
337 337 __push_fake_cur_stree();
338 338 FOR_EACH_PTR(call_backs, tmp) {
339 339 if (tmp->type != RANGED_CALL)
340 340 continue;
341 341 if (!false_comparison_range_LR(comparison, tmp->range, value_range, left))
342 342 continue;
343 343 (tmp->u.ranged)(fn, expr, NULL, tmp->info);
344 344 } END_FOR_EACH_PTR(tmp);
345 345 tmp_stree = __pop_fake_cur_stree();
346 346 merge_fake_stree(&false_states, tmp_stree);
347 347 free_stree(&tmp_stree);
348 348
349 349 *implied_true = true_states;
350 350 *implied_false = false_states;
351 351 }
352 352
353 353 struct db_callback_info {
354 354 int true_side;
355 355 int comparison;
356 356 struct expression *expr;
357 357 struct range_list *rl;
358 358 int left;
359 359 struct stree *stree;
360 360 struct db_implies_list *callbacks;
361 361 int prev_return_id;
362 362 int cull;
363 363 int has_states;
364 364 char *ret_str;
365 365 struct smatch_state *ret_state;
366 366 struct expression *var_expr;
367 367 int handled;
368 368 };
369 369
370 370 static void store_return_state(struct db_callback_info *db_info, const char *ret_str, struct smatch_state *state)
371 371 {
372 372 db_info->ret_str = alloc_sname(ret_str),
373 373 db_info->ret_state = state;
374 374 }
375 375
376 376 static bool fake_a_param_assignment(struct expression *expr, const char *return_str, struct smatch_state *orig)
377 377 {
378 378 struct expression *arg, *left, *right, *tmp, *fake_assign;
379 379 char *p;
380 380 int param;
381 381 char buf[256];
382 382 char *str;
383 383
384 384 if (expr->type != EXPR_ASSIGNMENT || expr->op != '=')
385 385 return false;
386 386 left = expr->left;
387 387 right = expr->right;
388 388
389 389 while (right->type == EXPR_ASSIGNMENT)
390 390 right = strip_expr(right->right);
391 391 if (!right || right->type != EXPR_CALL)
392 392 return false;
393 393
394 394 p = strchr(return_str, '[');
395 395 if (!p)
396 396 return false;
397 397
398 398 p++;
399 399 if (p[0] == '=' && p[1] == '=')
400 400 p += 2;
401 401 if (p[0] != '$')
402 402 return false;
403 403
404 404 snprintf(buf, sizeof(buf), "%s", p);
405 405
406 406 p = buf;
407 407 p += 1;
408 408 param = strtol(p, &p, 10);
409 409
410 410 p = strchr(p, ']');
411 411 if (!p || *p != ']')
412 412 return false;
413 413 *p = '\0';
414 414
415 415 arg = get_argument_from_call_expr(right->args, param);
416 416 if (!arg)
417 417 return false;
418 418
419 419 /* There should be a get_other_name() function which returns an expr */
420 420 tmp = get_assigned_expr(arg);
421 421 if (tmp)
422 422 arg = tmp;
423 423
424 424 /*
425 425 * This is a sanity check to prevent side effects from evaluating stuff
426 426 * twice.
427 427 */
428 428 str = expr_to_chunk_sym_vsl(arg, NULL, NULL);
429 429 if (!str)
430 430 return false;
431 431 free_string(str);
432 432
433 433 right = gen_expression_from_key(arg, buf);
434 434 if (!right) /* Mostly fails for binops like [$0 + 4032] */
435 435 return false;
436 436 fake_assign = assign_expression(left, '=', right);
437 437 __in_fake_parameter_assign++;
438 438 __split_expr(fake_assign);
439 439 __in_fake_parameter_assign--;
440 440
441 441 /*
442 442 * If the return is "0-65531[$0->nla_len - 4]" the faked expression
443 443 * is maybe (-4)-65531 but we know it is in the 0-65531 range so both
444 444 * parts have to be considered. We use _nomod() because it's not really
445 445 * another modification, it's just a clarification.
446 446 *
447 447 */
448 448 if (estate_rl(orig)) {
449 449 struct smatch_state *faked;
450 450 struct range_list *rl;
451 451
452 452 faked = get_extra_state(left);
453 453 if (estate_rl(faked)) {
454 454 rl = rl_intersection(estate_rl(faked), estate_rl(orig));
455 455 if (rl)
456 456 set_extra_expr_nomod(expr, alloc_estate_rl(rl));
457 457 }
458 458 }
459 459
460 460 return true;
461 461 }
462 462
463 463 static void set_return_assign_state(struct db_callback_info *db_info)
464 464 {
465 465 struct expression *expr = db_info->expr->left;
466 466 struct smatch_state *state;
467 467
468 468 if (!db_info->ret_state)
469 469 return;
470 470
471 471 state = alloc_estate_rl(cast_rl(get_type(expr), clone_rl(estate_rl(db_info->ret_state))));
472 472 if (!fake_a_param_assignment(db_info->expr, db_info->ret_str, state))
473 473 set_extra_expr_mod(expr, state);
474 474
475 475 db_info->ret_state = NULL;
476 476 db_info->ret_str = NULL;
477 477 }
478 478
479 479 static void set_other_side_state(struct db_callback_info *db_info)
480 480 {
481 481 struct expression *expr = db_info->var_expr;
482 482 struct smatch_state *state;
483 483
484 484 if (!db_info->ret_state)
485 485 return;
486 486
487 487 state = alloc_estate_rl(cast_rl(get_type(expr), clone_rl(estate_rl(db_info->ret_state))));
488 488 set_extra_expr_nomod(expr, state);
489 489 db_info->ret_state = NULL;
490 490 db_info->ret_str = NULL;
491 491 }
492 492
493 493 static void handle_ret_equals_param(char *ret_string, struct range_list *rl, struct expression *call)
494 494 {
495 495 char *str;
496 496 long long param;
497 497 struct expression *arg;
498 498 struct range_list *orig;
499 499
500 500 str = strstr(ret_string, "==$");
501 501 if (!str)
502 502 return;
503 503 str += 3;
504 504 param = strtoll(str, NULL, 10);
505 505 arg = get_argument_from_call_expr(call->args, param);
506 506 if (!arg)
507 507 return;
508 508 get_absolute_rl(arg, &orig);
509 509 rl = rl_intersection(orig, rl);
510 510 if (!rl)
511 511 return;
512 512 set_extra_expr_nomod(arg, alloc_estate_rl(rl));
513 513 }
514 514
515 515 static int impossible_limit(struct expression *expr, int param, char *key, char *value)
516 516 {
517 517 struct expression *arg;
518 518 struct smatch_state *state;
519 519 struct range_list *passed;
520 520 struct range_list *limit;
521 521 struct symbol *compare_type;
522 522
523 523 while (expr->type == EXPR_ASSIGNMENT)
524 524 expr = strip_expr(expr->right);
525 525 if (expr->type != EXPR_CALL)
526 526 return 0;
527 527
528 528 arg = get_argument_from_call_expr(expr->args, param);
529 529 if (!arg)
530 530 return 0;
531 531
532 532 if (strcmp(key, "$") == 0) {
533 533 if (!get_implied_rl(arg, &passed))
534 534 return 0;
535 535
536 536 compare_type = get_arg_type(expr->fn, param);
537 537 } else {
538 538 char *name;
539 539 struct symbol *sym;
540 540
541 541 name = get_variable_from_key(arg, key, &sym);
542 542 if (!name || !sym)
543 543 return 0;
544 544
545 545 state = get_state(SMATCH_EXTRA, name, sym);
546 546 if (!state) {
547 547 free_string(name);
548 548 return 0;
549 549 }
550 550 passed = estate_rl(state);
551 551 if (!passed || is_whole_rl(passed)) {
552 552 free_string(name);
553 553 return 0;
554 554 }
555 555
556 556 compare_type = get_member_type_from_key(arg, key);
557 557 }
558 558
559 559 passed = cast_rl(compare_type, passed);
560 560 call_results_to_rl(expr, compare_type, value, &limit);
561 561 if (!limit || is_whole_rl(limit))
562 562 return 0;
563 563 if (possibly_true_rl(passed, SPECIAL_EQUAL, limit))
564 564 return 0;
565 565 if (option_debug || local_debug)
566 566 sm_msg("impossible: %d '%s' limit '%s' == '%s'", param, key, show_rl(passed), value);
567 567 return 1;
568 568 }
569 569
570 570 static int is_impossible_data(int type, struct expression *expr, int param, char *key, char *value)
571 571 {
572 572 if (type == PARAM_LIMIT && impossible_limit(expr, param, key, value))
573 573 return 1;
574 574 if (type == COMPARE_LIMIT && param_compare_limit_is_impossible(expr, param, key, value)) {
575 575 if (local_debug)
576 576 sm_msg("param_compare_limit_is_impossible: %d %s %s", param, key, value);
577 577 return 1;
578 578 }
579 579 return 0;
580 580 }
581 581
582 582 static int func_type_mismatch(struct expression *expr, const char *value)
583 583 {
584 584 struct symbol *type;
585 585
586 586 /* This makes faking returns easier */
587 587 if (!value || value[0] == '\0')
588 588 return 0;
589 589
590 590 while (expr->type == EXPR_ASSIGNMENT)
591 591 expr = strip_expr(expr->right);
592 592
593 593 /*
594 594 * Short cut: We only care about function pointers that are struct
595 595 * members.
596 596 *
597 597 */
598 598 if (expr->fn->type == EXPR_SYMBOL)
599 599 return 0;
600 600
601 601 type = get_type(expr->fn);
602 602 if (!type)
603 603 return 0;
604 604 if (type->type == SYM_PTR)
605 605 type = get_real_base_type(type);
606 606
607 607 if (strcmp(type_to_str(type), value) == 0)
608 608 return 0;
609 609
610 610 return 1;
611 611 }
612 612
613 613 static int db_compare_callback(void *_info, int argc, char **argv, char **azColName)
614 614 {
615 615 struct db_callback_info *db_info = _info;
616 616 struct range_list *var_rl = db_info->rl;
617 617 struct range_list *ret_range;
618 618 int type, param;
619 619 char *ret_str, *key, *value;
620 620 struct return_implies_callback *tmp;
621 621 struct stree *stree;
622 622 int return_id;
623 623 int comparison;
624 624
625 625 if (argc != 6)
626 626 return 0;
627 627
628 628 return_id = atoi(argv[0]);
629 629 ret_str = argv[1];
630 630 type = atoi(argv[2]);
631 631 param = atoi(argv[3]);
632 632 key = argv[4];
633 633 value = argv[5];
634 634
635 635 db_info->has_states = 1;
636 636 if (db_info->prev_return_id != -1 && type == INTERNAL) {
637 637 set_other_side_state(db_info);
638 638 stree = __pop_fake_cur_stree();
639 639
640 640 if (!db_info->cull)
641 641 merge_fake_stree(&db_info->stree, stree);
642 642 free_stree(&stree);
643 643 __push_fake_cur_stree();
644 644 db_info->cull = 0;
645 645 }
646 646 db_info->prev_return_id = return_id;
647 647
648 648 if (type == INTERNAL && func_type_mismatch(db_info->expr, value))
649 649 db_info->cull = 1;
650 650 if (db_info->cull)
651 651 return 0;
652 652 if (type == CULL_PATH) {
653 653 db_info->cull = 1;
654 654 return 0;
655 655 }
656 656
657 657 if (is_impossible_data(type, db_info->expr, param, key, value)) {
658 658 db_info->cull = 1;
659 659 return 0;
660 660 }
661 661
662 662 call_results_to_rl(db_info->expr, get_type(strip_expr(db_info->expr)), ret_str, &ret_range);
663 663 ret_range = cast_rl(get_type(db_info->expr), ret_range);
664 664 if (!ret_range)
665 665 ret_range = alloc_whole_rl(get_type(db_info->expr));
666 666
667 667 comparison = db_info->comparison;
668 668 if (db_info->left)
669 669 comparison = flip_comparison(comparison);
670 670
671 671 if (db_info->true_side) {
672 672 if (!possibly_true_rl(var_rl, comparison, ret_range))
673 673 return 0;
674 674 if (type == PARAM_LIMIT)
675 675 param_limit_implications(db_info->expr, param, key, value);
676 676 filter_by_comparison(&var_rl, comparison, ret_range);
677 677 filter_by_comparison(&ret_range, flip_comparison(comparison), var_rl);
678 678 } else {
679 679 if (!possibly_false_rl(var_rl, comparison, ret_range))
680 680 return 0;
681 681 if (type == PARAM_LIMIT)
682 682 param_limit_implications(db_info->expr, param, key, value);
683 683 filter_by_comparison(&var_rl, negate_comparison(comparison), ret_range);
684 684 filter_by_comparison(&ret_range, flip_comparison(negate_comparison(comparison)), var_rl);
685 685 }
686 686
687 687 handle_ret_equals_param(ret_str, ret_range, db_info->expr);
688 688
689 689 if (type == INTERNAL) {
690 690 set_state(-1, "unnull_path", NULL, &true_state);
691 691 __add_return_comparison(strip_expr(db_info->expr), ret_str);
692 692 __add_return_to_param_mapping(db_info->expr, ret_str);
693 693 store_return_state(db_info, ret_str, alloc_estate_rl(clone_rl(var_rl)));
694 694 }
695 695
696 696 FOR_EACH_PTR(db_info->callbacks, tmp) {
697 697 if (tmp->type == type)
698 698 tmp->callback(db_info->expr, param, key, value);
699 699 } END_FOR_EACH_PTR(tmp);
700 700
701 701 return 0;
702 702 }
703 703
704 704 static void compare_db_return_states_callbacks(struct expression *left, int comparison, struct expression *right, struct stree *implied_true, struct stree *implied_false)
705 705 {
706 706 struct stree *orig_states;
707 707 struct stree *stree;
708 708 struct stree *true_states;
709 709 struct stree *false_states;
710 710 struct sm_state *sm;
711 711 struct db_callback_info db_info = {};
712 712 struct expression *var_expr;
713 713 struct expression *call_expr;
714 714 struct range_list *rl;
715 715 int call_on_left;
716 716
717 717 orig_states = clone_stree(__get_cur_stree());
718 718
719 719 /* legacy cruft. need to fix call_implies_callbacks(). */
720 720 call_on_left = 1;
721 721 call_expr = left;
722 722 var_expr = right;
723 723 if (left->type != EXPR_CALL) {
724 724 call_on_left = 0;
725 725 call_expr = right;
726 726 var_expr = left;
727 727 }
728 728
729 729 get_absolute_rl(var_expr, &rl);
730 730
731 731 db_info.comparison = comparison;
732 732 db_info.expr = call_expr;
733 733 db_info.rl = rl;
734 734 db_info.left = call_on_left;
735 735 db_info.callbacks = db_return_states_list;
736 736 db_info.var_expr = var_expr;
737 737
738 738 call_return_states_before_hooks();
739 739
740 740 db_info.true_side = 1;
741 741 db_info.stree = NULL;
742 742 db_info.prev_return_id = -1;
743 743 __push_fake_cur_stree();
744 744 sql_select_return_states("return_id, return, type, parameter, key, value",
745 745 call_expr, db_compare_callback, &db_info);
746 746 set_other_side_state(&db_info);
747 747 stree = __pop_fake_cur_stree();
748 748 if (!db_info.cull)
749 749 merge_fake_stree(&db_info.stree, stree);
750 750 free_stree(&stree);
751 751 true_states = db_info.stree;
752 752 if (!true_states && db_info.has_states) {
753 753 __push_fake_cur_stree();
754 754 set_path_impossible();
755 755 true_states = __pop_fake_cur_stree();
756 756 }
757 757
758 758 nullify_path();
759 759 __unnullify_path();
760 760 FOR_EACH_SM(orig_states, sm) {
761 761 __set_sm_cur_stree(sm);
762 762 } END_FOR_EACH_SM(sm);
763 763
764 764 db_info.true_side = 0;
765 765 db_info.stree = NULL;
766 766 db_info.prev_return_id = -1;
767 767 db_info.cull = 0;
768 768 __push_fake_cur_stree();
769 769 sql_select_return_states("return_id, return, type, parameter, key, value", call_expr,
770 770 db_compare_callback, &db_info);
771 771 set_other_side_state(&db_info);
772 772 stree = __pop_fake_cur_stree();
773 773 if (!db_info.cull)
774 774 merge_fake_stree(&db_info.stree, stree);
775 775 free_stree(&stree);
776 776 false_states = db_info.stree;
777 777 if (!false_states && db_info.has_states) {
778 778 __push_fake_cur_stree();
779 779 set_path_impossible();
780 780 false_states = __pop_fake_cur_stree();
781 781 }
782 782
783 783 nullify_path();
784 784 __unnullify_path();
785 785 FOR_EACH_SM(orig_states, sm) {
786 786 __set_sm_cur_stree(sm);
787 787 } END_FOR_EACH_SM(sm);
788 788
789 789 free_stree(&orig_states);
790 790
791 791 FOR_EACH_SM(true_states, sm) {
792 792 __set_true_false_sm(sm, NULL);
793 793 } END_FOR_EACH_SM(sm);
794 794 FOR_EACH_SM(false_states, sm) {
795 795 __set_true_false_sm(NULL, sm);
796 796 } END_FOR_EACH_SM(sm);
797 797
798 798 free_stree(&true_states);
799 799 free_stree(&false_states);
800 800
801 801 call_return_states_after_hooks(call_expr);
802 802
803 803 FOR_EACH_SM(implied_true, sm) {
804 804 __set_true_false_sm(sm, NULL);
805 805 } END_FOR_EACH_SM(sm);
806 806 FOR_EACH_SM(implied_false, sm) {
807 807 __set_true_false_sm(NULL, sm);
808 808 } END_FOR_EACH_SM(sm);
809 809 }
810 810
811 811 void function_comparison(struct expression *left, int comparison, struct expression *right)
812 812 {
813 813 struct expression *var_expr;
814 814 struct expression *call_expr;
815 815 struct stree *implied_true = NULL;
816 816 struct stree *implied_false = NULL;
817 817 struct range_list *rl;
818 818 sval_t sval;
819 819 int call_on_left;
820 820
821 821 if (unreachable())
822 822 return;
823 823
824 824 /* legacy cruft. need to fix call_implies_callbacks(). */
825 825 call_on_left = 1;
826 826 call_expr = left;
827 827 var_expr = right;
828 828 if (left->type != EXPR_CALL) {
829 829 call_on_left = 0;
830 830 call_expr = right;
831 831 var_expr = left;
832 832 }
833 833
834 834 get_absolute_rl(var_expr, &rl);
835 835
836 836 if (rl_to_sval(rl, &sval))
837 837 call_implies_callbacks(comparison, call_expr, sval, call_on_left, &implied_true, &implied_false);
838 838
839 839 compare_db_return_states_callbacks(left, comparison, right, implied_true, implied_false);
840 840 free_stree(&implied_true);
841 841 free_stree(&implied_false);
842 842 }
843 843
844 844 static void call_ranged_return_hooks(struct db_callback_info *db_info)
845 845 {
846 846 struct call_back_list *call_backs;
847 847 struct expression *expr;
848 848 struct fcall_back *tmp;
849 849 char *fn;
850 850
851 851 expr = strip_expr(db_info->expr);
852 852 while (expr->type == EXPR_ASSIGNMENT)
853 853 expr = strip_expr(expr->right);
854 854 if (expr->type != EXPR_CALL ||
855 855 expr->fn->type != EXPR_SYMBOL)
856 856 return;
857 857
858 858 fn = expr->fn->symbol_name->name;
859 859
860 860 call_backs = search_callback(func_hash, fn);
861 861 FOR_EACH_PTR(call_backs, tmp) {
862 862 struct range_list *range_rl;
863 863
864 864 if (tmp->type != RANGED_CALL)
865 865 continue;
866 866 range_rl = alloc_rl(tmp->range->min, tmp->range->max);
867 867 range_rl = cast_rl(estate_type(db_info->ret_state), range_rl);
868 868 if (possibly_true_rl(range_rl, SPECIAL_EQUAL, estate_rl(db_info->ret_state)))
869 869 (tmp->u.ranged)(fn, expr, db_info->expr, tmp->info);
870 870 } END_FOR_EACH_PTR(tmp);
871 871 }
872 872
873 873 static int db_assign_return_states_callback(void *_info, int argc, char **argv, char **azColName)
874 874 {
875 875 struct db_callback_info *db_info = _info;
876 876 struct range_list *ret_range;
877 877 int type, param;
878 878 char *ret_str, *key, *value;
879 879 struct return_implies_callback *tmp;
880 880 struct stree *stree;
881 881 int return_id;
882 882
883 883 if (argc != 6)
884 884 return 0;
885 885
886 886 return_id = atoi(argv[0]);
887 887 ret_str = argv[1];
888 888 type = atoi(argv[2]);
889 889 param = atoi(argv[3]);
890 890 key = argv[4];
891 891 value = argv[5];
892 892
893 893 if (db_info->prev_return_id != -1 && type == INTERNAL) {
894 894 call_ranged_return_hooks(db_info);
895 895 set_return_assign_state(db_info);
896 896 stree = __pop_fake_cur_stree();
897 897 if (!db_info->cull)
898 898 merge_fake_stree(&db_info->stree, stree);
899 899 free_stree(&stree);
900 900 __push_fake_cur_stree();
901 901 db_info->cull = 0;
902 902 }
903 903 db_info->prev_return_id = return_id;
904 904
905 905 if (type == INTERNAL && func_type_mismatch(db_info->expr, value))
906 906 db_info->cull = 1;
907 907 if (db_info->cull)
908 908 return 0;
909 909 if (type == CULL_PATH) {
910 910 db_info->cull = 1;
911 911 return 0;
912 912 }
913 913 if (is_impossible_data(type, db_info->expr, param, key, value)) {
914 914 db_info->cull = 1;
915 915 return 0;
916 916 }
917 917
918 918 if (type == PARAM_LIMIT)
919 919 param_limit_implications(db_info->expr, param, key, value);
920 920
921 921 db_info->handled = 1;
922 922 call_results_to_rl(db_info->expr->right, get_type(strip_expr(db_info->expr->right)), ret_str, &ret_range);
923 923 if (!ret_range)
924 924 ret_range = alloc_whole_rl(get_type(strip_expr(db_info->expr->right)));
925 925 ret_range = cast_rl(get_type(db_info->expr->right), ret_range);
926 926
927 927 if (type == INTERNAL) {
928 928 set_state(-1, "unnull_path", NULL, &true_state);
929 929 __add_return_comparison(strip_expr(db_info->expr->right), ret_str);
930 930 __add_comparison_info(db_info->expr->left, strip_expr(db_info->expr->right), ret_str);
931 931 __add_return_to_param_mapping(db_info->expr, ret_str);
932 932 store_return_state(db_info, ret_str, alloc_estate_rl(ret_range));
933 933 }
934 934
935 935 FOR_EACH_PTR(db_return_states_list, tmp) {
936 936 if (tmp->type == type)
937 937 tmp->callback(db_info->expr, param, key, value);
938 938 } END_FOR_EACH_PTR(tmp);
939 939
940 940 return 0;
941 941 }
942 942
943 943 static int db_return_states_assign(struct expression *expr)
944 944 {
945 945 struct expression *right;
946 946 struct sm_state *sm;
947 947 struct stree *stree;
948 948 struct db_callback_info db_info = {};
949 949
950 950 right = strip_expr(expr->right);
951 951
952 952 db_info.prev_return_id = -1;
953 953 db_info.expr = expr;
954 954 db_info.stree = NULL;
955 955 db_info.handled = 0;
956 956
957 957 call_return_states_before_hooks();
958 958
959 959 __push_fake_cur_stree();
960 960 sql_select_return_states("return_id, return, type, parameter, key, value",
961 961 right, db_assign_return_states_callback, &db_info);
962 962 if (option_debug) {
963 963 sm_msg("%s return_id %d return_ranges %s",
964 964 db_info.cull ? "culled" : "merging",
965 965 db_info.prev_return_id,
966 966 db_info.ret_state ? db_info.ret_state->name : "'<empty>'");
967 967 }
968 968 if (db_info.handled)
969 969 call_ranged_return_hooks(&db_info);
970 970 set_return_assign_state(&db_info);
971 971 stree = __pop_fake_cur_stree();
972 972 if (!db_info.cull)
973 973 merge_fake_stree(&db_info.stree, stree);
974 974 free_stree(&stree);
975 975
976 976 if (!db_info.stree && db_info.cull) { /* this means we culled everything */
977 977 set_extra_expr_mod(expr->left, alloc_estate_whole(get_type(expr->left)));
978 978 set_path_impossible();
979 979 }
980 980 FOR_EACH_SM(db_info.stree, sm) {
981 981 __set_sm(sm);
982 982 } END_FOR_EACH_SM(sm);
983 983
984 984 free_stree(&db_info.stree);
985 985 call_return_states_after_hooks(right);
986 986
987 987 return db_info.handled;
988 988 }
989 989
990 990 static int handle_implied_return(struct expression *expr)
991 991 {
992 992 struct range_list *rl;
993 993
994 994 if (!get_implied_return(expr->right, &rl))
995 995 return 0;
996 996 rl = cast_rl(get_type(expr->left), rl);
997 997 set_extra_expr_mod(expr->left, alloc_estate_rl(rl));
998 998 return 1;
999 999 }
1000 1000
1001 1001 static void match_assign_call(struct expression *expr)
1002 1002 {
1003 1003 struct call_back_list *call_backs;
1004 1004 const char *fn;
1005 1005 struct expression *right;
1006 1006 int handled = 0;
1007 1007 struct range_list *rl;
1008 1008
1009 1009 if (expr->op != '=')
1010 1010 return;
1011 1011
1012 1012 right = strip_expr(expr->right);
1013 1013 if (right->fn->type != EXPR_SYMBOL || !right->fn->symbol) {
1014 1014 handled |= db_return_states_assign(expr);
1015 1015 if (!handled)
1016 1016 goto assigned_unknown;
1017 1017 return;
1018 1018 }
1019 1019 if (is_fake_call(right)) {
1020 1020 set_extra_expr_mod(expr->left, alloc_estate_whole(get_type(expr->left)));
1021 1021 return;
1022 1022 }
1023 1023
1024 1024 fn = right->fn->symbol->ident->name;
1025 1025 call_backs = search_callback(func_hash, (char *)fn);
1026 1026
1027 1027 /*
1028 1028 * The ordering here is sort of important.
1029 1029 * One example, of how this matters is that when we do:
1030 1030 *
1031 1031 * len = strlen(str);
1032 1032 *
1033 1033 * That is handled by smatch_common_functions.c and smatch_strlen.c.
1034 1034 * They use implied_return and function_assign_hook respectively.
1035 1035 * We want to get the implied return first before we do the function
1036 1036 * assignment hook otherwise we end up writing the wrong thing for len
1037 1037 * in smatch_extra.c because we assume that it already holds the
1038 1038 * strlen() when we haven't set it yet.
1039 1039 */
1040 1040
1041 1041 if (db_return_states_assign(expr) == 1)
1042 1042 handled = 1;
1043 1043 else
1044 1044 handled = assign_ranged_funcs(fn, expr, call_backs);
1045 1045 handled |= handle_implied_return(expr);
1046 1046
1047 1047
1048 1048 call_call_backs(call_backs, ASSIGN_CALL, fn, expr);
1049 1049
1050 1050 if (handled)
1051 1051 return;
1052 1052
1053 1053 assigned_unknown:
1054 1054 get_absolute_rl(expr->right, &rl);
1055 1055 rl = cast_rl(get_type(expr->left), rl);
1056 1056 set_extra_expr_mod(expr->left, alloc_estate_rl(rl));
1057 1057 }
1058 1058
1059 1059 static int db_return_states_callback(void *_info, int argc, char **argv, char **azColName)
1060 1060 {
1061 1061 struct db_callback_info *db_info = _info;
1062 1062 struct range_list *ret_range;
1063 1063 int type, param;
1064 1064 char *ret_str, *key, *value;
1065 1065 struct return_implies_callback *tmp;
1066 1066 struct stree *stree;
1067 1067 int return_id;
1068 1068 char buf[64];
1069 1069
1070 1070 if (argc != 6)
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1071 1071 return 0;
1072 1072
1073 1073 return_id = atoi(argv[0]);
1074 1074 ret_str = argv[1];
1075 1075 type = atoi(argv[2]);
1076 1076 param = atoi(argv[3]);
1077 1077 key = argv[4];
1078 1078 value = argv[5];
1079 1079
1080 1080 if (db_info->prev_return_id != -1 && type == INTERNAL) {
1081 + call_ranged_return_hooks(db_info);
1081 1082 stree = __pop_fake_cur_stree();
1082 1083 if (!db_info->cull)
1083 1084 merge_fake_stree(&db_info->stree, stree);
1084 1085 free_stree(&stree);
1085 1086 __push_fake_cur_stree();
1086 1087 __unnullify_path();
1087 1088 db_info->cull = 0;
1088 1089 }
1089 1090 db_info->prev_return_id = return_id;
1090 1091
1091 1092 if (type == INTERNAL && func_type_mismatch(db_info->expr, value))
1092 1093 db_info->cull = 1;
1093 1094 if (db_info->cull)
1094 1095 return 0;
1095 1096 if (type == CULL_PATH) {
1096 1097 db_info->cull = 1;
1097 1098 return 0;
1098 1099 }
1099 1100 if (is_impossible_data(type, db_info->expr, param, key, value)) {
1100 1101 db_info->cull = 1;
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1101 1102 return 0;
1102 1103 }
1103 1104
1104 1105 if (type == PARAM_LIMIT)
1105 1106 param_limit_implications(db_info->expr, param, key, value);
1106 1107
1107 1108 call_results_to_rl(db_info->expr, get_type(strip_expr(db_info->expr)), ret_str, &ret_range);
1108 1109 ret_range = cast_rl(get_type(db_info->expr), ret_range);
1109 1110
1110 1111 if (type == INTERNAL) {
1112 + struct smatch_state *state;
1113 +
1111 1114 set_state(-1, "unnull_path", NULL, &true_state);
1112 1115 __add_return_comparison(strip_expr(db_info->expr), ret_str);
1113 1116 __add_return_to_param_mapping(db_info->expr, ret_str);
1117 + /*
1118 + * We want to store the return values so that we can split the strees
1119 + * in smatch_db.c. This uses set_state() directly because it's not a
1120 + * real smatch_extra state.
1121 + */
1122 + snprintf(buf, sizeof(buf), "return %p", db_info->expr);
1123 + state = alloc_estate_rl(ret_range);
1124 + set_state(SMATCH_EXTRA, buf, NULL, state);
1125 + store_return_state(db_info, ret_str, state);
1114 1126 }
1115 1127
1116 1128 FOR_EACH_PTR(db_return_states_list, tmp) {
1117 1129 if (tmp->type == type)
1118 1130 tmp->callback(db_info->expr, param, key, value);
1119 1131 } END_FOR_EACH_PTR(tmp);
1120 1132
1121 - /*
1122 - * We want to store the return values so that we can split the strees
1123 - * in smatch_db.c. This uses set_state() directly because it's not a
1124 - * real smatch_extra state.
1125 - */
1126 - snprintf(buf, sizeof(buf), "return %p", db_info->expr);
1127 - set_state(SMATCH_EXTRA, buf, NULL, alloc_estate_rl(ret_range));
1128 1133
1129 1134 return 0;
1130 1135 }
1131 1136
1132 1137 static void db_return_states(struct expression *expr)
1133 1138 {
1134 1139 struct sm_state *sm;
1135 1140 struct stree *stree;
1136 1141 struct db_callback_info db_info = {};
1137 1142
1138 1143 if (!__get_cur_stree()) /* no return functions */
1139 1144 return;
1140 1145
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1141 1146 db_info.prev_return_id = -1;
1142 1147 db_info.expr = expr;
1143 1148 db_info.stree = NULL;
1144 1149
1145 1150 call_return_states_before_hooks();
1146 1151
1147 1152 __push_fake_cur_stree();
1148 1153 __unnullify_path();
1149 1154 sql_select_return_states("return_id, return, type, parameter, key, value",
1150 1155 expr, db_return_states_callback, &db_info);
1156 + call_ranged_return_hooks(&db_info);
1151 1157 stree = __pop_fake_cur_stree();
1152 1158 if (!db_info.cull)
1153 1159 merge_fake_stree(&db_info.stree, stree);
1154 1160 free_stree(&stree);
1155 1161
1156 1162 FOR_EACH_SM(db_info.stree, sm) {
1157 1163 __set_sm(sm);
1158 1164 } END_FOR_EACH_SM(sm);
1159 1165
1160 1166 free_stree(&db_info.stree);
1161 1167 call_return_states_after_hooks(expr);
1162 1168 }
1163 1169
1164 1170 static int is_condition_call(struct expression *expr)
1165 1171 {
1166 1172 struct expression *tmp;
1167 1173
1168 1174 FOR_EACH_PTR_REVERSE(big_condition_stack, tmp) {
1169 1175 if (expr == tmp || expr_get_parent_expr(expr) == tmp)
1170 1176 return 1;
1171 1177 if (tmp->pos.line < expr->pos.line)
1172 1178 return 0;
1173 1179 } END_FOR_EACH_PTR_REVERSE(tmp);
1174 1180
1175 1181 return 0;
1176 1182 }
1177 1183
1178 1184 static void db_return_states_call(struct expression *expr)
1179 1185 {
1180 1186 if (unreachable())
1181 1187 return;
1182 1188
1183 1189 if (is_assigned_call(expr))
1184 1190 return;
1185 1191 if (is_condition_call(expr))
1186 1192 return;
1187 1193 db_return_states(expr);
1188 1194 }
1189 1195
1190 1196 static void match_function_call(struct expression *expr)
1191 1197 {
1192 1198 struct call_back_list *call_backs;
1193 1199 struct expression *fn;
1194 1200
1195 1201 fn = strip_expr(expr->fn);
1196 1202 if (fn->type == EXPR_SYMBOL && fn->symbol) {
1197 1203 call_backs = search_callback(func_hash, (char *)fn->symbol->ident->name);
1198 1204 if (call_backs)
1199 1205 call_call_backs(call_backs, REGULAR_CALL,
1200 1206 fn->symbol->ident->name, expr);
1201 1207 }
1202 1208 db_return_states_call(expr);
1203 1209 }
1204 1210
1205 1211 static void match_macro_assign(struct expression *expr)
1206 1212 {
1207 1213 struct call_back_list *call_backs;
1208 1214 const char *macro;
1209 1215 struct expression *right;
1210 1216
1211 1217 right = strip_expr(expr->right);
1212 1218 macro = get_macro_name(right->pos);
1213 1219 call_backs = search_callback(func_hash, (char *)macro);
1214 1220 if (!call_backs)
1215 1221 return;
1216 1222 call_call_backs(call_backs, MACRO_ASSIGN, macro, expr);
1217 1223 call_call_backs(call_backs, MACRO_ASSIGN_EXTRA, macro, expr);
1218 1224 }
1219 1225
1220 1226 int get_implied_return(struct expression *expr, struct range_list **rl)
1221 1227 {
1222 1228 struct call_back_list *call_backs;
1223 1229 struct fcall_back *tmp;
1224 1230 int handled = 0;
1225 1231 char *fn;
1226 1232
1227 1233 *rl = NULL;
1228 1234
1229 1235 expr = strip_expr(expr);
1230 1236 fn = expr_to_var(expr->fn);
1231 1237 if (!fn)
1232 1238 goto out;
1233 1239
1234 1240 call_backs = search_callback(func_hash, fn);
1235 1241
1236 1242 FOR_EACH_PTR(call_backs, tmp) {
1237 1243 if (tmp->type == IMPLIED_RETURN) {
1238 1244 (tmp->u.implied_return)(expr, tmp->info, rl);
1239 1245 handled = 1;
1240 1246 }
1241 1247 } END_FOR_EACH_PTR(tmp);
1242 1248
1243 1249 out:
1244 1250 free_string(fn);
1245 1251 return handled;
1246 1252 }
1247 1253
1248 1254 void create_function_hook_hash(void)
1249 1255 {
1250 1256 func_hash = create_function_hashtable(5000);
1251 1257 }
1252 1258
1253 1259 void register_function_hooks(int id)
1254 1260 {
1255 1261 add_hook(&match_function_call, CALL_HOOK_AFTER_INLINE);
1256 1262 add_hook(&match_assign_call, CALL_ASSIGNMENT_HOOK);
1257 1263 add_hook(&match_macro_assign, MACRO_ASSIGNMENT_HOOK);
1258 1264 }
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