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11506 smatch resync
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--- old/usr/src/tools/smatch/src/smatch_type_val.c
+++ new/usr/src/tools/smatch/src/smatch_type_val.c
1 1 /*
2 2 * Copyright (C) 2013 Oracle.
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 * The plan here is to save all the possible values store to a given struct
20 20 * member.
21 21 *
22 22 * We will load all the values in to the function_type_val table first then
23 23 * run a script on that and load all the resulting values into the type_val
24 24 * table.
25 25 *
26 26 * So in this file we want to take the union of everything assigned to the
27 27 * struct member and insert it into the function_type_val at the end.
28 28 *
29 29 * You would think that we could use smatch_modification_hooks.c or
30 30 * extra_modification_hook() here to get the information here but in the end we
31 31 * need to code everything again a third time.
32 32 *
33 33 */
34 34
35 35 #include "smatch.h"
36 36 #include "smatch_slist.h"
37 37 #include "smatch_extra.h"
38 38
39 39 static int my_id;
40 40
41 41 struct stree_stack *fn_type_val_stack;
42 42 struct stree *fn_type_val;
43 43 struct stree *global_type_val;
44 44
45 45 static int get_vals(void *_db_vals, int argc, char **argv, char **azColName)
46 46 {
47 47 char **db_vals = _db_vals;
48 48
49 49 *db_vals = alloc_string(argv[0]);
50 50 return 0;
51 51 }
52 52
53 53 static void match_inline_start(struct expression *expr)
54 54 {
55 55 push_stree(&fn_type_val_stack, fn_type_val);
56 56 fn_type_val = NULL;
57 57 }
58 58
59 59 static void match_inline_end(struct expression *expr)
60 60 {
61 61 free_stree(&fn_type_val);
62 62 fn_type_val = pop_stree(&fn_type_val_stack);
63 63 }
64 64
65 65 struct expr_rl {
66 66 struct expression *expr;
67 67 struct range_list *rl;
68 68 };
69 69 static struct expr_rl cached_results[10];
70 70 static int res_idx;
71 71
72 72 static int get_cached(struct expression *expr, struct range_list **rl, int *ret)
73 73 {
74 74 int i;
75 75
76 76 *ret = 0;
77 77
78 78 for (i = 0; i < ARRAY_SIZE(cached_results); i++) {
79 79 if (expr == cached_results[i].expr) {
80 80 if (cached_results[i].rl) {
81 81 *rl = clone_rl(cached_results[i].rl);
82 82 *ret = 1;
83 83 }
84 84 return 1;
85 85 }
86 86 }
87 87
88 88 return 0;
89 89 }
90 90
91 91 int get_db_type_rl(struct expression *expr, struct range_list **rl)
92 92 {
93 93 char *db_vals = NULL;
94 94 char *member;
95 95 struct range_list *tmp;
96 96 struct symbol *type;
97 97 int ret;
98 98
99 99 if (get_cached(expr, rl, &ret))
100 100 return ret;
101 101
102 102 member = get_member_name(expr);
103 103 if (!member)
104 104 return 0;
105 105
106 106 res_idx = (res_idx + 1) % ARRAY_SIZE(cached_results);
107 107 cached_results[res_idx].expr = expr;
108 108 cached_results[res_idx].rl = NULL;
109 109
110 110 run_sql(get_vals, &db_vals,
111 111 "select value from type_value where type = '%s';", member);
112 112 free_string(member);
113 113 if (!db_vals)
114 114 return 0;
115 115 type = get_type(expr);
116 116 str_to_rl(type, db_vals, &tmp);
117 117 free_string(db_vals);
118 118 if (is_whole_rl(tmp))
119 119 return 0;
120 120
121 121 *rl = tmp;
122 122 cached_results[res_idx].rl = clone_rl(tmp);
123 123
124 124 return 1;
125 125 }
126 126
127 127 static void add_type_val(char *member, struct range_list *rl)
128 128 {
129 129 struct smatch_state *old, *add, *new;
130 130
131 131 member = alloc_string(member);
132 132 old = get_state_stree(fn_type_val, my_id, member, NULL);
133 133 add = alloc_estate_rl(rl);
134 134 if (old)
135 135 new = merge_estates(old, add);
136 136 else
137 137 new = add;
138 138 set_state_stree(&fn_type_val, my_id, member, NULL, new);
139 139 }
140 140
141 141 static void add_fake_type_val(char *member, struct range_list *rl, int ignore)
142 142 {
143 143 struct smatch_state *old, *add, *new;
144 144
145 145 member = alloc_string(member);
146 146 old = get_state_stree(fn_type_val, my_id, member, NULL);
147 147 if (old && strcmp(old->name, "min-max") == 0)
148 148 return;
149 149 if (ignore && old && strcmp(old->name, "ignore") == 0)
150 150 return;
151 151 add = alloc_estate_rl(rl);
152 152 if (old) {
153 153 new = merge_estates(old, add);
154 154 } else {
155 155 new = add;
156 156 if (ignore)
157 157 new->name = alloc_string("ignore");
158 158 else
159 159 new->name = alloc_string("min-max");
160 160 }
161 161 set_state_stree(&fn_type_val, my_id, member, NULL, new);
162 162 }
163 163
164 164 static void add_global_type_val(char *member, struct range_list *rl)
165 165 {
166 166 struct smatch_state *old, *add, *new;
167 167
168 168 member = alloc_string(member);
169 169 old = get_state_stree(global_type_val, my_id, member, NULL);
170 170 add = alloc_estate_rl(rl);
171 171 if (old)
172 172 new = merge_estates(old, add);
173 173 else
174 174 new = add;
175 175 new = clone_estate_perm(new);
176 176 set_state_stree_perm(&global_type_val, my_id, member, NULL, new);
177 177 }
178 178
179 179 static int has_link_cb(void *has_link, int argc, char **argv, char **azColName)
180 180 {
181 181 *(int *)has_link = 1;
182 182 return 0;
183 183 }
184 184
185 185 static int is_ignored_fake_assignment(void)
186 186 {
187 187 struct expression *expr;
188 188 struct symbol *type;
189 189 char *member_name;
190 190 int has_link = 0;
191 191
192 192 expr = get_faked_expression();
193 193 if (!expr || expr->type != EXPR_ASSIGNMENT)
194 194 return 0;
195 195 if (!is_void_pointer(expr->right))
196 196 return 0;
197 197 member_name = get_member_name(expr->right);
198 198 if (!member_name)
199 199 return 0;
200 200
201 201 type = get_type(expr->left);
202 202 if (!type || type->type != SYM_PTR)
203 203 return 0;
204 204 type = get_real_base_type(type);
205 205 if (!type || type->type != SYM_STRUCT)
206 206 return 0;
207 207
208 208 run_sql(has_link_cb, &has_link,
209 209 "select * from data_info where type = %d and data = '%s' and value = '%s';",
210 210 TYPE_LINK, member_name, type_to_str(type));
211 211 return has_link;
212 212 }
213 213
214 214 static int is_container_of(void)
215 215 {
216 216 /* We already check the macro name in is_ignored_macro() */
217 217 struct expression *expr;
218 218 int offset;
219 219
220 220 expr = get_faked_expression();
221 221 if (!expr || expr->type != EXPR_ASSIGNMENT)
222 222 return 0;
223 223
224 224 offset = get_offset_from_container_of(expr->right);
225 225 if (offset < 0)
226 226 return 0;
227 227 return 1;
228 228 }
229 229
230 230 static int is_ignored_macro(void)
231 231 {
232 232 struct expression *expr;
233 233 char *name;
234 234
235 235 expr = get_faked_expression();
236 236 if (!expr || expr->type != EXPR_ASSIGNMENT)
237 237 return 0;
238 238 name = get_macro_name(expr->right->pos);
239 239 if (!name)
240 240 return 0;
241 241 if (strcmp(name, "container_of") == 0)
242 242 return 1;
243 243 if (strcmp(name, "rb_entry") == 0)
244 244 return 1;
245 245 if (strcmp(name, "list_entry") == 0)
246 246 return 1;
247 247 if (strcmp(name, "list_first_entry") == 0)
248 248 return 1;
249 249 if (strcmp(name, "hlist_entry") == 0)
250 250 return 1;
251 251 if (strstr(name, "for_each"))
252 252 return 1;
253 253 return 0;
254 254 }
255 255
256 256 static int is_ignored_function(void)
257 257 {
258 258 struct expression *expr;
259 259
260 260 expr = get_faked_expression();
261 261 if (!expr || expr->type != EXPR_ASSIGNMENT)
262 262 return 0;
263 263 expr = strip_expr(expr->right);
264 264 if (!expr || expr->type != EXPR_CALL || expr->fn->type != EXPR_SYMBOL)
265 265 return 0;
266 266
267 267 if (sym_name_is("kmalloc", expr->fn))
268 268 return 1;
269 269 if (sym_name_is("netdev_priv", expr->fn))
270 270 return 1;
271 271 if (sym_name_is("dev_get_drvdata", expr->fn))
272 272 return 1;
273 273
274 274 return 0;
275 275 }
276 276
277 277 static int is_uncasted_pointer_assign(void)
278 278 {
279 279 struct expression *expr;
280 280 struct symbol *left_type, *right_type;
281 281
282 282 expr = get_faked_expression();
283 283 if (!expr)
284 284 return 0;
285 285 if (expr->type == EXPR_PREOP || expr->type == EXPR_POSTOP) {
286 286 if (expr->op == SPECIAL_INCREMENT || expr->op == SPECIAL_DECREMENT)
287 287 return 1;
288 288 }
289 289 if (expr->type != EXPR_ASSIGNMENT)
290 290 return 0;
291 291 left_type = get_type(expr->left);
292 292 right_type = get_type(expr->right);
293 293
294 294 if (!left_type || !right_type)
295 295 return 0;
296 296
297 297 if (left_type->type != SYM_PTR &&
298 298 left_type->type != SYM_ARRAY)
299 299 return 0;
300 300 if (right_type->type != SYM_PTR &&
301 301 right_type->type != SYM_ARRAY)
302 302 return 0;
303 303 left_type = get_real_base_type(left_type);
304 304 right_type = get_real_base_type(right_type);
305 305
306 306 if (left_type == right_type)
307 307 return 1;
308 308 return 0;
309 309 }
310 310
311 311 static int set_param_type(void *_type_str, int argc, char **argv, char **azColName)
312 312 {
313 313 char **type_str = _type_str;
314 314 static char type_buf[128];
315 315
316 316 if (*type_str) {
317 317 if (strcmp(*type_str, argv[0]) == 0)
318 318 return 0;
319 319 strncpy(type_buf, "unknown", sizeof(type_buf));
320 320 return 0;
321 321 }
322 322 strncpy(type_buf, argv[0], sizeof(type_buf));
323 323 *type_str = type_buf;
324 324
325 325 return 0;
326 326 }
327 327
328 328 static char *db_get_parameter_type(int param)
329 329 {
330 330 char *ret = NULL;
331 331
332 332 if (!cur_func_sym)
333 333 return NULL;
334 334
335 335 run_sql(set_param_type, &ret,
336 336 "select value from fn_data_link where "
337 337 "file = '%s' and function = '%s' and static = %d and type = %d and parameter = %d and key = '$';",
338 338 (cur_func_sym->ctype.modifiers & MOD_STATIC) ? get_base_file() : "extern",
339 339 cur_func_sym->ident->name,
340 340 !!(cur_func_sym->ctype.modifiers & MOD_STATIC),
341 341 PASSES_TYPE, param);
342 342
343 343 return ret;
344 344 }
345 345
346 346 static int is_uncasted_fn_param_from_db(void)
347 347 {
348 348 struct expression *expr, *right;
349 349 struct symbol *left_type;
350 350 char left_type_name[128];
351 351 int param;
352 352 char *right_type_name;
353 353 static struct expression *prev_expr;
354 354 static int prev_ans;
355 355
356 356 expr = get_faked_expression();
357 357
358 358 if (expr == prev_expr)
359 359 return prev_ans;
360 360 prev_expr = expr;
361 361 prev_ans = 0;
362 362
363 363 if (!expr || expr->type != EXPR_ASSIGNMENT)
364 364 return 0;
365 365 left_type = get_type(expr->left);
366 366 if (!left_type || left_type->type != SYM_PTR)
367 367 return 0;
368 368 left_type = get_real_base_type(left_type);
369 369 if (!left_type || left_type->type != SYM_STRUCT)
370 370 return 0;
371 371 snprintf(left_type_name, sizeof(left_type_name), "%s", type_to_str(left_type));
372 372
373 373 right = strip_expr(expr->right);
374 374 param = get_param_num(right);
375 375 if (param < 0)
376 376 return 0;
377 377 right_type_name = db_get_parameter_type(param);
378 378 if (!right_type_name)
379 379 return 0;
380 380
381 381 if (strcmp(right_type_name, left_type_name) == 0) {
382 382 prev_ans = 1;
383 383 return 1;
384 384 }
385 385
386 386 return 0;
387 387 }
388 388
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389 389 static void match_assign_value(struct expression *expr)
390 390 {
391 391 char *member, *right_member;
392 392 struct range_list *rl;
393 393 struct symbol *type;
394 394
395 395 if (!cur_func_sym)
396 396 return;
397 397
398 398 type = get_type(expr->left);
399 - if (type && type->type == SYM_STRUCT)
400 - return;
401 -
402 399 member = get_member_name(expr->left);
403 400 if (!member)
404 401 return;
405 402
406 403 /* if we're saying foo->mtu = bar->mtu then that doesn't add information */
407 404 right_member = get_member_name(expr->right);
408 405 if (right_member && strcmp(right_member, member) == 0)
409 406 goto free;
410 407
411 408 if (is_fake_call(expr->right)) {
412 409 if (is_ignored_macro())
413 410 goto free;
414 411 if (is_ignored_function())
415 412 goto free;
416 413 if (is_uncasted_pointer_assign())
417 414 goto free;
418 415 if (is_uncasted_fn_param_from_db())
419 416 goto free;
420 417 if (is_container_of())
421 418 goto free;
422 419 add_fake_type_val(member, alloc_whole_rl(get_type(expr->left)), is_ignored_fake_assignment());
423 420 goto free;
424 421 }
425 422
426 423 if (expr->op == '=') {
427 424 get_absolute_rl(expr->right, &rl);
428 425 rl = cast_rl(type, rl);
429 426 } else {
430 427 /*
431 428 * This is a bit cheating. We order it so this will already be set
432 429 * by smatch_extra.c and we just look up the value.
433 430 */
434 431 get_absolute_rl(expr->left, &rl);
435 432 }
436 433 add_type_val(member, rl);
437 434 free:
438 435 free_string(right_member);
439 436 free_string(member);
440 437 }
441 438
442 439 /*
443 440 * If we too: int *p = &my_struct->member then abandon all hope of tracking
444 441 * my_struct->member.
445 442 */
446 443 static void match_assign_pointer(struct expression *expr)
447 444 {
448 445 struct expression *right;
449 446 char *member;
450 447 struct range_list *rl;
451 448 struct symbol *type;
452 449
453 450 right = strip_expr(expr->right);
454 451 if (right->type != EXPR_PREOP || right->op != '&')
455 452 return;
456 453 right = strip_expr(right->unop);
457 454
458 455 member = get_member_name(right);
459 456 if (!member)
460 457 return;
461 458 type = get_type(right);
462 459 rl = alloc_whole_rl(type);
463 460 add_type_val(member, rl);
464 461 free_string(member);
465 462 }
466 463
467 464 static void match_global_assign(struct expression *expr)
468 465 {
469 466 char *member;
470 467 struct range_list *rl;
471 468 struct symbol *type;
472 469
473 470 type = get_type(expr->left);
474 471 if (type && (type->type == SYM_ARRAY || type->type == SYM_STRUCT))
475 472 return;
476 473 member = get_member_name(expr->left);
477 474 if (!member)
478 475 return;
479 476 get_absolute_rl(expr->right, &rl);
480 477 rl = cast_rl(type, rl);
481 478 add_global_type_val(member, rl);
482 479 free_string(member);
483 480 }
484 481
485 482 static void unop_expr(struct expression *expr)
486 483 {
487 484 struct range_list *rl;
488 485 char *member;
489 486
490 487 if (expr->op != SPECIAL_DECREMENT && expr->op != SPECIAL_INCREMENT)
491 488 return;
492 489
493 490 expr = strip_expr(expr->unop);
494 491 member = get_member_name(expr);
495 492 if (!member)
496 493 return;
497 494 rl = alloc_whole_rl(get_type(expr));
498 495 add_type_val(member, rl);
499 496 free_string(member);
500 497 }
501 498
502 499 static void asm_expr(struct statement *stmt)
503 500 {
504 501 struct expression *expr;
505 502 struct range_list *rl;
506 503 char *member;
507 504 int state = 0;
508 505
509 506 FOR_EACH_PTR(stmt->asm_outputs, expr) {
510 507 switch (state) {
511 508 case 0: /* identifier */
512 509 case 1: /* constraint */
513 510 state++;
514 511 continue;
515 512 case 2: /* expression */
516 513 state = 0;
517 514 member = get_member_name(expr);
518 515 if (!member)
519 516 continue;
520 517 rl = alloc_whole_rl(get_type(expr));
521 518 add_type_val(member, rl);
522 519 free_string(member);
523 520 continue;
524 521 }
525 522 } END_FOR_EACH_PTR(expr);
526 523 }
527 524
528 525 static void db_param_add(struct expression *expr, int param, char *key, char *value)
529 526 {
530 527 struct expression *arg;
531 528 struct symbol *type;
532 529 struct range_list *rl;
533 530 char *member;
534 531
535 532 if (strcmp(key, "*$") != 0)
536 533 return;
537 534
538 535 while (expr->type == EXPR_ASSIGNMENT)
539 536 expr = strip_expr(expr->right);
540 537 if (expr->type != EXPR_CALL)
541 538 return;
542 539
543 540 arg = get_argument_from_call_expr(expr->args, param);
544 541 arg = strip_expr(arg);
545 542 if (!arg)
546 543 return;
547 544 type = get_member_type_from_key(arg, key);
548 545 if (arg->type != EXPR_PREOP || arg->op != '&')
549 546 return;
550 547 arg = strip_expr(arg->unop);
551 548
552 549 member = get_member_name(arg);
553 550 if (!member)
554 551 return;
555 552 call_results_to_rl(expr, type, value, &rl);
556 553 add_type_val(member, rl);
557 554 free_string(member);
558 555 }
559 556
560 557 static void match_end_func_info(struct symbol *sym)
561 558 {
562 559 struct sm_state *sm;
563 560
564 561 FOR_EACH_SM(fn_type_val, sm) {
565 562 sql_insert_function_type_value(sm->name, sm->state->name);
566 563 } END_FOR_EACH_SM(sm);
567 564 }
568 565
569 566 static void clear_cache(struct symbol *sym)
570 567 {
571 568 memset(cached_results, 0, sizeof(cached_results));
572 569 }
573 570
574 571 static void match_after_func(struct symbol *sym)
575 572 {
576 573 free_stree(&fn_type_val);
577 574 }
578 575
579 576 static void match_end_file(struct symbol_list *sym_list)
580 577 {
581 578 struct sm_state *sm;
582 579
583 580 FOR_EACH_SM(global_type_val, sm) {
584 581 sql_insert_function_type_value(sm->name, sm->state->name);
585 582 } END_FOR_EACH_SM(sm);
586 583 }
587 584
588 585 void register_type_val(int id)
589 586 {
590 587 my_id = id;
591 588 add_hook(&clear_cache, AFTER_FUNC_HOOK);
592 589
593 590 if (!option_info)
594 591 return;
595 592
596 593 add_hook(&match_assign_value, ASSIGNMENT_HOOK_AFTER);
597 594 add_hook(&match_assign_pointer, ASSIGNMENT_HOOK);
598 595 add_hook(&unop_expr, OP_HOOK);
599 596 add_hook(&asm_expr, ASM_HOOK);
600 597 select_return_states_hook(PARAM_ADD, &db_param_add);
601 598 select_return_states_hook(PARAM_SET, &db_param_add);
602 599
603 600
604 601 add_hook(&match_inline_start, INLINE_FN_START);
605 602 add_hook(&match_inline_end, INLINE_FN_END);
606 603
607 604 add_hook(&match_end_func_info, END_FUNC_HOOK);
608 605 add_hook(&match_after_func, AFTER_FUNC_HOOK);
609 606
610 607 add_hook(&match_global_assign, GLOBAL_ASSIGNMENT_HOOK);
611 608 add_hook(&match_end_file, END_FILE_HOOK);
612 609 }
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