?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
shift_to_zero: be even more conservative (avoid false positives)
[smatch.git] / smatch_db.c
blob616e1a70351d1f333022780bb7df448c64110595
1 /*
2 * Copyright (C) 2010 Dan Carpenter.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, see http://www.gnu.org/copyleft/gpl.txt
16 */
17
18 #include <string.h>
19 #include <errno.h>
20 #include <unistd.h>
21 #include <ctype.h>
22 #include "smatch.h"
23 #include "smatch_slist.h"
24 #include "smatch_extra.h"
25
26 struct sqlite3 *smatch_db;
27 struct sqlite3 *mem_db;
28 struct sqlite3 *cache_db;
29
30 int debug_db;
31
32 static int return_id;
33
34 static void call_return_state_hooks(struct expression *expr);
35
36 #define SQLITE_CACHE_PAGES 1000
37
38 struct def_callback {
39 int hook_type;
40 void (*callback)(const char *name, struct symbol *sym, char *key, char *value);
41 };
42 ALLOCATOR(def_callback, "definition db hook callbacks");
43 DECLARE_PTR_LIST(callback_list, struct def_callback);
44 static struct callback_list *select_caller_info_callbacks;
45
46 struct member_info_callback {
47 int owner;
48 void (*callback)(struct expression *call, int param, char *printed_name, struct sm_state *sm);
49 };
50 ALLOCATOR(member_info_callback, "caller_info callbacks");
51 DECLARE_PTR_LIST(member_info_cb_list, struct member_info_callback);
52 static struct member_info_cb_list *member_callbacks;
53 static struct member_info_cb_list *member_callbacks_new;
54
55 struct returned_state_callback {
56 void (*callback)(int return_id, char *return_ranges, struct expression *return_expr);
57 };
58 ALLOCATOR(returned_state_callback, "returned state callbacks");
59 DECLARE_PTR_LIST(returned_state_cb_list, struct returned_state_callback);
60 static struct returned_state_cb_list *returned_state_callbacks;
61
62 struct returned_member_callback {
63 int owner;
64 void (*callback)(int return_id, char *return_ranges, struct expression *expr, char *printed_name, struct smatch_state *state);
65 };
66 ALLOCATOR(returned_member_callback, "returned member callbacks");
67 DECLARE_PTR_LIST(returned_member_cb_list, struct returned_member_callback);
68 static struct returned_member_cb_list *returned_member_callbacks;
69
70 struct db_implies_callback {
71 int type;
72 void (*callback)(struct expression *call, struct expression *arg, char *key, char *value);
73 };
74 ALLOCATOR(db_implies_callback, "return_implies callbacks");
75 DECLARE_PTR_LIST(db_implies_cb_list, struct db_implies_callback);
76 static struct db_implies_cb_list *return_implies_cb_list;
77 static struct db_implies_cb_list *call_implies_cb_list;
78
79 /* silently truncates if needed. */
80 char *escape_newlines(const char *str)
81 {
82 char buf[1024] = "";
83 bool found = false;
84 int i, j;
85
86 for (i = 0, j = 0; str[i] != '\0' && j != sizeof(buf); i++, j++) {
87 if (str[i] != '\r' && str[i] != '\n') {
88 buf[j] = str[i];
89 continue;
90 }
91
92 found = true;
93 buf[j++] = '\\';
94 if (j == sizeof(buf))
95 break;
96 buf[j] = 'n';
97 }
98
99 if (!found)
100 return alloc_sname(str);
101
102 if (j == sizeof(buf))
103 buf[j - 1] = '\0';
104 return alloc_sname(buf);
105 }
106
107 static int print_sql_output(void *unused, int argc, char **argv, char **azColName)
108 {
109 int i;
110
111 for (i = 0; i < argc; i++) {
112 if (i != 0)
113 sm_printf(", ");
114 sm_printf("%s", argv[i]);
115 }
116 sm_printf("\n");
117 return 0;
118 }
119
120 void sql_exec(struct sqlite3 *db, int (*callback)(void*, int, char**, char**), void *data, const char *sql)
121 {
122 char *err = NULL;
123 int rc;
124
125 if (!db)
126 return;
127
128 if (option_debug || debug_db) {
129 sm_msg("%s", sql);
130 if (strncasecmp(sql, "select", strlen("select")) == 0)
131 sqlite3_exec(db, sql, print_sql_output, NULL, NULL);
132 }
133
134 rc = sqlite3_exec(db, sql, callback, data, &err);
135 if (rc != SQLITE_OK && !parse_error) {
136 sm_ierror("%s:%d SQL error #2: %s\n", get_filename(), get_lineno(), err);
137 sm_ierror("%s:%d SQL: '%s'\n", get_filename(), get_lineno(), sql);
138 parse_error = 1;
139 }
140 }
141
142 static int replace_count;
143 static char **replace_table;
144 static const char *replace_return_ranges(const char *return_ranges)
145 {
146 int i;
147
148 if (!get_function()) {
149 /* I have no idea why EXPORT_SYMBOL() is here */
150 return return_ranges;
151 }
152 for (i = 0; i < replace_count; i += 3) {
153 if (strcmp(replace_table[i + 0], get_function()) == 0) {
154 if (strcmp(replace_table[i + 1], return_ranges) == 0)
155 return replace_table[i + 2];
156 }
157 }
158 return return_ranges;
159 }
160
161
162 static char *use_states;
163 static int get_db_state_count(void)
164 {
165 struct sm_state *sm;
166 int count = 0;
167
168 FOR_EACH_SM(__get_cur_stree(), sm) {
169 if (sm->owner == USHRT_MAX)
170 continue;
171 if (use_states[sm->owner])
172 count++;
173 } END_FOR_EACH_SM(sm);
174 return count;
175 }
176
177 void db_ignore_states(int id)
178 {
179 use_states[id] = 0;
180 }
181
182 unsigned long long __fn_mtag;
183 static void set_fn_mtag(struct symbol *sym)
184 {
185 char buf[128];
186
187 if (cur_func_sym->ctype.modifiers & MOD_STATIC)
188 snprintf(buf, sizeof(buf), "%s %s", get_base_file(), get_function());
189 else
190 snprintf(buf, sizeof(buf), "extern %s", get_function());
191
192 __fn_mtag = str_to_mtag(buf);
193 }
194
195 void sql_insert_return_states(int return_id, const char *return_ranges,
196 int type, int param, const char *key, const char *value)
197 {
198 unsigned long long id;
199
200
201 if (key && strlen(key) >= 80)
202 return;
203 if (__inline_fn)
204 id = (unsigned long)__inline_fn;
205 else
206 id = __fn_mtag;
207
208 return_ranges = replace_return_ranges(return_ranges);
209 sql_insert(return_states, "'%s', '%s', %llu, %d, '%s', %d, %d, %d, '%s', '%s'",
210 get_base_file(), get_function(), id, return_id,
211 return_ranges, fn_static(), type, param, key, value);
212 }
213
214 static struct string_list *common_funcs;
215 static int is_common_function(const char *fn)
216 {
217 char *tmp;
218
219 if (!fn)
220 return 0;
221
222 if (strncmp(fn, "__builtin_", 10) == 0)
223 return 1;
224
225 FOR_EACH_PTR(common_funcs, tmp) {
226 if (strcmp(tmp, fn) == 0)
227 return 1;
228 } END_FOR_EACH_PTR(tmp);
229
230 return 0;
231 }
232
233 static char *function_signature(void)
234 {
235 return type_to_str(get_real_base_type(cur_func_sym));
236 }
237
238 void sql_insert_caller_info(struct expression *call, int type,
239 int param, const char *key, const char *value)
240 {
241 FILE *tmp_fd = sm_outfd;
242 char *fn;
243
244 if (!option_info && !__inline_call)
245 return;
246
247 if (key && strlen(key) >= 80)
248 return;
249
250 fn = get_fnptr_name(call->fn);
251 if (!fn)
252 return;
253
254 if (__inline_call) {
255 mem_sql(NULL, NULL,
256 "insert into caller_info values ('%s', '%s', '%s', %lu, %d, %d, %d, '%s', '%s');",
257 get_base_file(), get_function(), fn, (unsigned long)call,
258 is_static(call->fn), type, param, key, value);
259 }
260
261 if (!option_info)
262 return;
263
264 if (strncmp(fn, "__builtin_", 10) == 0)
265 return;
266 if (type != INTERNAL && is_common_function(fn))
267 return;
268
269 sm_outfd = caller_info_fd;
270 sm_msg("SQL_caller_info: insert into caller_info values ("
271 "'%s', '%s', '%s', %%CALL_ID%%, %d, %d, %d, '%s', '%s');",
272 get_base_file(), get_function(), fn, is_static(call->fn),
273 type, param, key, value);
274 sm_outfd = tmp_fd;
275
276 free_string(fn);
277 }
278
279 void sql_insert_function_ptr(const char *fn, const char *struct_name)
280 {
281 sql_insert_or_ignore(function_ptr, "'%s', '%s', '%s', 0",
282 get_base_file(), fn, struct_name);
283 }
284
285 void sql_insert_return_implies(int type, int param, const char *key, const char *value)
286 {
287 sql_insert_or_ignore(return_implies, "'%s', '%s', %lu, %d, %d, %d, '%s', '%s'",
288 get_base_file(), get_function(), (unsigned long)__inline_fn,
289 fn_static(), type, param, key, value);
290 }
291
292 void sql_insert_call_implies(int type, int param, const char *key, const char *value)
293 {
294 sql_insert_or_ignore(call_implies, "'%s', '%s', %lu, %d, %d, %d, '%s', '%s'",
295 get_base_file(), get_function(), (unsigned long)__inline_fn,
296 fn_static(), type, param, key, value);
297 }
298
299 void sql_insert_function_type_size(const char *member, const char *ranges)
300 {
301 sql_insert(function_type_size, "'%s', '%s', '%s', '%s'", get_base_file(), get_function(), member, ranges);
302 }
303
304 void sql_insert_function_type_info(int type, const char *struct_type, const char *member, const char *value)
305 {
306 sql_insert(function_type_info, "'%s', '%s', %d, '%s', '%s', '%s'", get_base_file(), get_function(), type, struct_type, member, value);
307 }
308
309 void sql_insert_type_info(int type, const char *member, const char *value)
310 {
311 sql_insert_cache(type_info, "'%s', %d, '%s', '%s'", get_base_file(), type, member, value);
312 }
313
314 void sql_insert_local_values(const char *name, const char *value)
315 {
316 sql_insert(local_values, "'%s', '%s', '%s'", get_base_file(), name, value);
317 }
318
319 void sql_insert_function_type_value(const char *type, const char *value)
320 {
321 sql_insert(function_type_value, "'%s', '%s', '%s', '%s'", get_base_file(), get_function(), type, value);
322 }
323
324 void sql_insert_function_type(int param, const char *value)
325 {
326 sql_insert(function_type, "'%s', '%s', %d, %d, '%s'",
327 get_base_file(), get_function(), fn_static(), param, value);
328 }
329
330 void sql_insert_parameter_name(int param, const char *value)
331 {
332 sql_insert(parameter_name, "'%s', '%s', %d, %d, '%s'",
333 get_base_file(), get_function(), fn_static(), param, value);
334 }
335
336 void sql_insert_data_info(struct expression *data, int type, const char *value)
337 {
338 char *data_name;
339
340 data_name = get_data_info_name(data);
341 if (!data_name)
342 return;
343 sql_insert(data_info, "'%s', '%s', %d, '%s'",
344 is_static(data) ? get_base_file() : "extern",
345 data_name, type, value);
346 }
347
348 void sql_insert_data_info_var_sym(const char *var, struct symbol *sym, int type, const char *value)
349 {
350 sql_insert(data_info, "'%s', '%s', %d, '%s'",
351 (sym->ctype.modifiers & MOD_STATIC) ? get_base_file() : "extern",
352 var, type, value);
353 }
354
355 void sql_save_constraint(const char *con)
356 {
357 if (!option_info)
358 return;
359
360 sm_msg("SQL: insert or ignore into constraints (str) values('%s');", escape_newlines(con));
361 }
362
363 void sql_save_constraint_required(const char *data, int op, const char *limit)
364 {
365 sql_insert_or_ignore(constraints_required, "'%s', '%s', '%s'", data, show_special(op), limit);
366 }
367
368 void sql_copy_constraint_required(const char *new_limit, const char *old_limit)
369 {
370 if (!option_info)
371 return;
372
373 sm_msg("SQL_late: insert or ignore into constraints_required (data, op, bound) "
374 "select constraints_required.data, constraints_required.op, '%s' from "
375 "constraints_required where bound = '%s';", new_limit, old_limit);
376 }
377
378 void sql_insert_fn_ptr_data_link(const char *ptr, const char *data)
379 {
380 sql_insert_or_ignore(fn_ptr_data_link, "'%s', '%s'", ptr, data);
381 }
382
383 void sql_insert_fn_data_link(struct expression *fn, int type, int param, const char *key, const char *value)
384 {
385 if (fn->type != EXPR_SYMBOL || !fn->symbol->ident)
386 return;
387
388 sql_insert(fn_data_link, "'%s', '%s', %d, %d, %d, '%s', '%s'",
389 (fn->symbol->ctype.modifiers & MOD_STATIC) ? get_base_file() : "extern",
390 fn->symbol->ident->name,
391 !!(fn->symbol->ctype.modifiers & MOD_STATIC),
392 type, param, key, value);
393 }
394
395 void sql_insert_mtag_about(mtag_t tag, const char *left_name, const char *right_name)
396 {
397 sql_insert_cache(mtag_about, "%lld, '%s', '%s', %d, '%s', '%s'",
398 tag, get_filename(), get_function(), get_lineno(),
399 left_name, right_name);
400 }
401
402 void sql_insert_mtag_info(mtag_t tag, int type, const char *value)
403 {
404 sql_insert_cache(mtag_info, "'%s', %lld, %d, '%s'", get_filename(), tag, type, value);
405 }
406
407 void sql_insert_mtag_map(mtag_t container, int container_offset, mtag_t tag, int tag_offset)
408 {
409 sql_insert(mtag_map, "%lld, %d, %lld, %d", container, container_offset, tag, tag_offset);
410 }
411
412 void sql_insert_mtag_alias(mtag_t orig, mtag_t alias)
413 {
414 sql_insert(mtag_alias, "%lld, %lld", orig, alias);
415 }
416
417 static int save_mtag(void *_tag, int argc, char **argv, char **azColName)
418 {
419 mtag_t *saved_tag = _tag;
420 mtag_t new_tag;
421
422 new_tag = strtoll(argv[0], NULL, 10);
423
424 if (!*saved_tag)
425 *saved_tag = new_tag;
426 else if (*saved_tag != new_tag)
427 *saved_tag = -1ULL;
428
429 return 0;
430 }
431
432 int mtag_map_select_container(mtag_t tag, int container_offset, mtag_t *container)
433 {
434 mtag_t tmp = 0;
435
436 run_sql(save_mtag, &tmp,
437 "select container from mtag_map where tag = %lld and container_offset = %d and tag_offset = 0;",
438 tag, container_offset);
439
440 if (tmp == 0 || tmp == -1ULL)
441 return 0;
442 *container = tmp;
443 return 1;
444 }
445
446 int mtag_map_select_tag(mtag_t container, int offset, mtag_t *tag)
447 {
448 mtag_t tmp = 0;
449
450 run_sql(save_mtag, &tmp,
451 "select tag from mtag_map where container = %lld and container_offset = %d;",
452 container, offset);
453
454 if (tmp == 0 || tmp == -1ULL)
455 return 0;
456 *tag = tmp;
457 return 1;
458 }
459
460 char *get_static_filter(struct symbol *sym)
461 {
462 static char sql_filter[1024];
463
464 /* This can only happen on buggy code. Return invalid SQL. */
465 if (!sym) {
466 sql_filter[0] = '\0';
467 return sql_filter;
468 }
469
470 if (sym->ctype.modifiers & MOD_STATIC) {
471 snprintf(sql_filter, sizeof(sql_filter),
472 "file = '%s' and function = '%s' and static = '1'",
473 get_base_file(), sym->ident->name);
474 } else {
475 snprintf(sql_filter, sizeof(sql_filter),
476 "function = '%s' and static = '0'", sym->ident->name);
477 }
478
479 return sql_filter;
480 }
481
482 static int get_row_count(void *_row_count, int argc, char **argv, char **azColName)
483 {
484 int *row_count = _row_count;
485
486 *row_count = 0;
487 if (argc != 1)
488 return 0;
489 *row_count = atoi(argv[0]);
490 return 0;
491 }
492
493 static void mark_call_params_untracked(struct expression *call)
494 {
495 struct expression *arg;
496 int i = 0;
497
498 FOR_EACH_PTR(call->args, arg) {
499 mark_untracked(call, i++, "$", NULL);
500 } END_FOR_EACH_PTR(arg);
501 }
502
503 static void sql_select_return_states_pointer(const char *cols,
504 struct expression *call, int (*callback)(void*, int, char**, char**), void *info)
505 {
506 char *ptr;
507 int return_count = 0;
508
509 ptr = get_fnptr_name(call->fn);
510 if (!ptr)
511 return;
512
513 run_sql(get_row_count, &return_count,
514 "select count(*) from return_states join function_ptr "
515 "where return_states.function == function_ptr.function and "
516 "ptr = '%s' and searchable = 1 and type = %d;", ptr, INTERNAL);
517 /* The magic number 100 is just from testing on the kernel. */
518 if (return_count > 100) {
519 mark_call_params_untracked(call);
520 return;
521 }
522
523 run_sql(callback, info,
524 "select %s from return_states join function_ptr where "
525 "return_states.function == function_ptr.function and ptr = '%s' "
526 "and searchable = 1 "
527 "order by function_ptr.file, return_states.file, return_id, type;",
528 cols, ptr);
529 }
530
531 static int is_local_symbol(struct expression *expr)
532 {
533 if (expr->type != EXPR_SYMBOL)
534 return 0;
535 if (expr->symbol->ctype.modifiers & (MOD_NONLOCAL | MOD_STATIC | MOD_ADDRESSABLE))
536 return 0;
537 return 1;
538 }
539
540 void sql_select_return_states(const char *cols, struct expression *call,
541 int (*callback)(void*, int, char**, char**), void *info)
542 {
543 struct expression *fn;
544 int row_count = 0;
545
546 if (is_fake_call(call))
547 return;
548
549 fn = strip_expr(call->fn);
550 if (fn->type != EXPR_SYMBOL || !fn->symbol || is_local_symbol(fn)) {
551 sql_select_return_states_pointer(cols, call, callback, info);
552 return;
553 }
554
555 if (inlinable(fn)) {
556 mem_sql(callback, info,
557 "select %s from return_states where call_id = '%lu' order by return_id, type;",
558 cols, (unsigned long)call);
559 return;
560 }
561
562 run_sql(get_row_count, &row_count, "select count(*) from return_states where %s;",
563 get_static_filter(fn->symbol));
564 if (row_count > 3000)
565 return;
566
567 run_sql(callback, info, "select %s from return_states where %s order by file, return_id, type;",
568 cols, get_static_filter(fn->symbol));
569 }
570
571 #define CALL_IMPLIES 0
572 #define RETURN_IMPLIES 1
573
574 struct implies_info {
575 int type;
576 struct db_implies_cb_list *cb_list;
577 struct expression *expr;
578 struct symbol *sym;
579 };
580
581 void sql_select_implies(const char *cols, struct implies_info *info,
582 int (*callback)(void*, int, char**, char**))
583 {
584 if (info->type == RETURN_IMPLIES && inlinable(info->expr->fn)) {
585 mem_sql(callback, info,
586 "select %s from return_implies where call_id = '%lu';",
587 cols, (unsigned long)info->expr);
588 return;
589 }
590
591 run_sql(callback, info, "select %s from %s_implies where %s;",
592 cols,
593 info->type == CALL_IMPLIES ? "call" : "return",
594 get_static_filter(info->sym));
595 }
596
597 struct select_caller_info_data {
598 struct stree *final_states;
599 struct timeval start_time;
600 int prev_func_id;
601 int ignore;
602 int results;
603 };
604
605 static int caller_info_callback(void *_data, int argc, char **argv, char **azColName);
606
607 static void sql_select_caller_info(struct select_caller_info_data *data,
608 const char *cols, struct symbol *sym)
609 {
610 if (__inline_fn) {
611 mem_sql(caller_info_callback, data,
612 "select %s from caller_info where call_id = %lu;",
613 cols, (unsigned long)__inline_fn);
614 return;
615 }
616
617 if (sym->ident->name && is_common_function(sym->ident->name))
618 return;
619 run_sql(caller_info_callback, data,
620 "select %s from common_caller_info where %s order by call_id;",
621 cols, get_static_filter(sym));
622 if (data->results)
623 return;
624
625 run_sql(caller_info_callback, data,
626 "select %s from caller_info where %s order by call_id;",
627 cols, get_static_filter(sym));
628 }
629
630 void select_caller_info_hook(void (*callback)(const char *name, struct symbol *sym, char *key, char *value), int type)
631 {
632 struct def_callback *def_callback = __alloc_def_callback(0);
633
634 def_callback->hook_type = type;
635 def_callback->callback = callback;
636 add_ptr_list(&select_caller_info_callbacks, def_callback);
637 }
638
639 /*
640 * These call backs are used when the --info option is turned on to print struct
641 * member information. For example foo->bar could have a state in
642 * smatch_extra.c and also check_user.c.
643 */
644 void add_member_info_callback(int owner, void (*callback)(struct expression *call, int param, char *printed_name, struct sm_state *sm))
645 {
646 struct member_info_callback *member_callback = __alloc_member_info_callback(0);
647
648 member_callback->owner = owner;
649 member_callback->callback = callback;
650 add_ptr_list(&member_callbacks, member_callback);
651 }
652
653 void add_caller_info_callback(int owner, void (*callback)(struct expression *call, int param, char *printed_name, struct sm_state *sm))
654 {
655 struct member_info_callback *member_callback = __alloc_member_info_callback(0);
656
657 member_callback->owner = owner;
658 member_callback->callback = callback;
659 add_ptr_list(&member_callbacks_new, member_callback);
660 }
661
662 void add_split_return_callback(void (*fn)(int return_id, char *return_ranges, struct expression *returned_expr))
663 {
664 struct returned_state_callback *callback = __alloc_returned_state_callback(0);
665
666 callback->callback = fn;
667 add_ptr_list(&returned_state_callbacks, callback);
668 }
669
670 void add_returned_member_callback(int owner, void (*callback)(int return_id, char *return_ranges, struct expression *expr, char *printed_name, struct smatch_state *state))
671 {
672 struct returned_member_callback *member_callback = __alloc_returned_member_callback(0);
673
674 member_callback->owner = owner;
675 member_callback->callback = callback;
676 add_ptr_list(&returned_member_callbacks, member_callback);
677 }
678
679 void select_call_implies_hook(int type, void (*callback)(struct expression *call, struct expression *arg, char *key, char *value))
680 {
681 struct db_implies_callback *cb = __alloc_db_implies_callback(0);
682
683 cb->type = type;
684 cb->callback = callback;
685 add_ptr_list(&call_implies_cb_list, cb);
686 }
687
688 void select_return_implies_hook(int type, void (*callback)(struct expression *call, struct expression *arg, char *key, char *value))
689 {
690 struct db_implies_callback *cb = __alloc_db_implies_callback(0);
691
692 cb->type = type;
693 cb->callback = callback;
694 add_ptr_list(&return_implies_cb_list, cb);
695 }
696
697 struct return_info {
698 struct expression *static_returns_call;
699 struct symbol *return_type;
700 struct range_list *return_range_list;
701 };
702
703 static int db_return_callback(void *_ret_info, int argc, char **argv, char **azColName)
704 {
705 struct return_info *ret_info = _ret_info;
706 struct range_list *rl;
707 struct expression *call_expr = ret_info->static_returns_call;
708
709 if (argc != 1)
710 return 0;
711 call_results_to_rl(call_expr, ret_info->return_type, argv[0], &rl);
712 ret_info->return_range_list = rl_union(ret_info->return_range_list, rl);
713 return 0;
714 }
715
716 struct range_list *db_return_vals(struct expression *expr)
717 {
718 struct return_info ret_info = {};
719 char buf[64];
720 struct sm_state *sm;
721
722 if (is_fake_call(expr))
723 return NULL;
724
725 snprintf(buf, sizeof(buf), "return %p", expr);
726 sm = get_sm_state(SMATCH_EXTRA, buf, NULL);
727 if (sm)
728 return clone_rl(estate_rl(sm->state));
729 ret_info.static_returns_call = expr;
730 ret_info.return_type = get_type(expr);
731 if (!ret_info.return_type)
732 return NULL;
733
734 if (expr->fn->type != EXPR_SYMBOL || !expr->fn->symbol)
735 return NULL;
736
737 ret_info.return_range_list = NULL;
738 if (inlinable(expr->fn)) {
739 mem_sql(db_return_callback, &ret_info,
740 "select distinct return from return_states where call_id = '%lu';",
741 (unsigned long)expr);
742 } else {
743 run_sql(db_return_callback, &ret_info,
744 "select distinct return from return_states where %s;",
745 get_static_filter(expr->fn->symbol));
746 }
747 return ret_info.return_range_list;
748 }
749
750 struct range_list *db_return_vals_from_str(const char *fn_name)
751 {
752 struct return_info ret_info;
753
754 ret_info.static_returns_call = NULL;
755 ret_info.return_type = &llong_ctype;
756 ret_info.return_range_list = NULL;
757
758 run_sql(db_return_callback, &ret_info,
759 "select distinct return from return_states where function = '%s';",
760 fn_name);
761 return ret_info.return_range_list;
762 }
763
764 /*
765 * This is used when we have a function that takes a function pointer as a
766 * parameter. "frob(blah, blah, my_function);" We know that the return values
767 * from frob() come from my_funcion() so we want to find the possible returns
768 * of my_function(), but we don't know which arguments are passed to it.
769 *
770 */
771 struct range_list *db_return_vals_no_args(struct expression *expr)
772 {
773 struct return_info ret_info = {};
774
775 if (!expr || expr->type != EXPR_SYMBOL)
776 return NULL;
777
778 ret_info.static_returns_call = expr;
779 ret_info.return_type = get_type(expr);
780 ret_info.return_type = get_real_base_type(ret_info.return_type);
781 if (!ret_info.return_type)
782 return NULL;
783
784 run_sql(db_return_callback, &ret_info,
785 "select distinct return from return_states where %s;",
786 get_static_filter(expr->symbol));
787
788 return ret_info.return_range_list;
789 }
790
791 static void match_call_marker(struct expression *expr)
792 {
793 struct symbol *type;
794
795 type = get_type(expr->fn);
796 if (type && type->type == SYM_PTR)
797 type = get_real_base_type(type);
798
799 /*
800 * we just want to record something in the database so that if we have
801 * two calls like: frob(4); frob(some_unkown); then on the receiving
802 * side we know that sometimes frob is called with unknown parameters.
803 */
804
805 sql_insert_caller_info(expr, INTERNAL, -1, "%call_marker%", type_to_str(type));
806 }
807
808 int is_recursive_member(const char *name)
809 {
810 char buf[256];
811 const char *p, *next;
812 int size;
813
814 p = strchr(name, '>');
815 if (!p)
816 return 0;
817 p++;
818 while (true) {
819 next = strchr(p, '>');
820 if (!next)
821 return 0;
822 next++;
823
824 size = next - p;
825 if (size >= sizeof(buf))
826 return 0;
827 memcpy(buf, p, size);
828 buf[size] = '\0';
829 if (strstr(next, buf))
830 return 1;
831 p = next;
832 }
833 }
834
835 char *sm_to_arg_name(struct expression *expr, struct sm_state *sm)
836 {
837 struct symbol *sym;
838 const char *sm_name;
839 char *name;
840 bool is_address = false;
841 bool add_star = false;
842 char buf[256];
843 char *ret = NULL;
844 int len;
845
846 expr = strip_expr(expr);
847 if (!expr)
848 return NULL;
849
850 if (expr->type == EXPR_PREOP && expr->op == '&') {
851 expr = strip_expr(expr->unop);
852 is_address = true;
853 }
854
855 name = expr_to_var_sym(expr, &sym);
856 if (!name || !sym)
857 goto free;
858 if (sym != sm->sym)
859 goto free;
860
861 sm_name = sm->name;
862 add_star = false;
863 if (sm_name[0] == '*') {
864 add_star = true;
865 sm_name++;
866 }
867
868 len = strlen(name);
869 if (strncmp(name, sm_name, len) != 0)
870 goto free;
871 if (sm_name[len] == '\0') {
872 snprintf(buf, sizeof(buf), "%s%s$",
873 add_star ? "*" : "", is_address ? "*" : "");
874 } else {
875 if (sm_name[len] != '.' && sm_name[len] != '-')
876 goto free;
877 if (sm_name[len] == '-')
878 len++;
879 // FIXME does is_address really imply that sm_name[len] == '-'
880 snprintf(buf, sizeof(buf), "%s$->%s", add_star ? "*" : "",
881 sm_name + len);
882 }
883
884 ret = alloc_sname(buf);
885 free:
886 free_string(name);
887 return ret;
888 }
889
890 static void print_struct_members(struct expression *call, struct expression *expr, int param, struct stree *stree,
891 void (*callback)(struct expression *call, int param, char *printed_name, struct sm_state *sm),
892 bool new)
893 {
894 struct sm_state *sm;
895 const char *sm_name;
896 char *name;
897 struct symbol *sym;
898 int len;
899 char printed_name[256];
900 int is_address = 0;
901 bool add_star;
902 struct symbol *type;
903
904 expr = strip_expr(expr);
905 if (!expr)
906 return;
907 type = get_type(expr);
908 if (type && type_bits(type) < type_bits(&ulong_ctype))
909 return;
910
911 if (expr->type == EXPR_PREOP && expr->op == '&') {
912 expr = strip_expr(expr->unop);
913 is_address = 1;
914 }
915
916 name = expr_to_var_sym(expr, &sym);
917 if (!name || !sym)
918 goto free;
919
920 len = strlen(name);
921 FOR_EACH_SM(stree, sm) {
922 if (sm->sym != sym)
923 continue;
924 sm_name = sm->name;
925 add_star = false;
926 if (sm_name[0] == '*') {
927 add_star = true;
928 sm_name++;
929 }
930 // FIXME: simplify?
931 if (!add_star && strcmp(name, sm_name) == 0) {
932 if (is_address) {
933 snprintf(printed_name, sizeof(printed_name), "*$");
934 } else {
935 if (new)
936 snprintf(printed_name, sizeof(printed_name), "$");
937 else
938 continue;
939 }
940 } else if (add_star && strcmp(name, sm_name) == 0) {
941 snprintf(printed_name, sizeof(printed_name), "%s*$",
942 is_address ? "*" : "");
943 } else if (strncmp(name, sm_name, len) == 0) {
944 if (sm_name[len] != '.' && sm_name[len] != '-')
945 continue;
946 if (is_address && sm_name[len] == '.') {
947 snprintf(printed_name, sizeof(printed_name),
948 "%s$->%s", add_star ? "*" : "",
949 sm_name + len + 1);
950 } else if (is_address && sm_name[len] == '-') {
951 snprintf(printed_name, sizeof(printed_name),
952 "%s(*$)%s", add_star ? "*" : "",
953 sm_name + len);
954 } else {
955 snprintf(printed_name, sizeof(printed_name),
956 "%s$%s", add_star ? "*" : "",
957 sm_name + len);
958 }
959 } else {
960 continue;
961 }
962 if (is_recursive_member(printed_name))
963 continue;
964 callback(call, param, printed_name, sm);
965 } END_FOR_EACH_SM(sm);
966 free:
967 free_string(name);
968 }
969
970 static void match_call_info(struct expression *call)
971 {
972 struct member_info_callback *cb;
973 struct expression *arg;
974 struct stree *stree;
975 char *name;
976 int i;
977
978 name = get_fnptr_name(call->fn);
979 if (!name)
980 return;
981
982 FOR_EACH_PTR(member_callbacks, cb) {
983 stree = get_all_states_stree(cb->owner);
984 i = 0;
985 FOR_EACH_PTR(call->args, arg) {
986 print_struct_members(call, arg, i, stree, cb->callback, 0);
987 i++;
988 } END_FOR_EACH_PTR(arg);
989 free_stree(&stree);
990 } END_FOR_EACH_PTR(cb);
991
992 free_string(name);
993 }
994
995 static void match_call_info_new(struct expression *call)
996 {
997 struct member_info_callback *cb;
998 struct expression *arg;
999 struct stree *stree;
1000 char *name;
1001 int i;
1002
1003 name = get_fnptr_name(call->fn);
1004 if (!name)
1005 return;
1006
1007 FOR_EACH_PTR(member_callbacks_new, cb) {
1008 stree = get_all_states_stree(cb->owner);
1009 i = 0;
1010 FOR_EACH_PTR(call->args, arg) {
1011 print_struct_members(call, arg, i, stree, cb->callback, 1);
1012 i++;
1013 } END_FOR_EACH_PTR(arg);
1014 free_stree(&stree);
1015 } END_FOR_EACH_PTR(cb);
1016
1017 free_string(name);
1018 }
1019
1020 static int get_param(int param, char **name, struct symbol **sym)
1021 {
1022 struct symbol *arg;
1023 int i;
1024
1025 i = 0;
1026 FOR_EACH_PTR(cur_func_sym->ctype.base_type->arguments, arg) {
1027 /*
1028 * this is a temporary hack to work around a bug (I think in sparse?)
1029 * 2.6.37-rc1:fs/reiserfs/journal.o
1030 * If there is a function definition without parameter name found
1031 * after a function implementation then it causes a crash.
1032 * int foo() {}
1033 * int bar(char *);
1034 */
1035 if (arg->ident->name < (char *)100)
1036 continue;
1037 if (i == param) {
1038 *name = arg->ident->name;
1039 *sym = arg;
1040 return TRUE;
1041 }
1042 i++;
1043 } END_FOR_EACH_PTR(arg);
1044
1045 return FALSE;
1046 }
1047
1048 static int function_signature_matches(const char *sig)
1049 {
1050 char *my_sig;
1051
1052 my_sig = function_signature();
1053 if (!sig || !my_sig)
1054 return 1; /* default to matching */
1055 if (strcmp(my_sig, sig) == 0)
1056 return 1;
1057 return 0;
1058 }
1059
1060 static int caller_info_callback(void *_data, int argc, char **argv, char **azColName)
1061 {
1062 struct select_caller_info_data *data = _data;
1063 int func_id;
1064 long type;
1065 long param;
1066 char *key;
1067 char *value;
1068 char *name = NULL;
1069 struct symbol *sym = NULL;
1070 struct def_callback *def_callback;
1071 struct stree *stree;
1072 struct timeval cur_time;
1073
1074 data->results = 1;
1075
1076 if (argc != 5)
1077 return 0;
1078
1079 gettimeofday(&cur_time, NULL);
1080 if (cur_time.tv_sec - data->start_time.tv_sec > 10)
1081 return 0;
1082
1083 func_id = atoi(argv[0]);
1084 errno = 0;
1085 type = strtol(argv[1], NULL, 10);
1086 param = strtol(argv[2], NULL, 10);
1087 if (errno)
1088 return 0;
1089 key = argv[3];
1090 value = argv[4];
1091
1092 if (data->prev_func_id == -1)
1093 data->prev_func_id = func_id;
1094 if (func_id != data->prev_func_id) {
1095 stree = __pop_fake_cur_stree();
1096 if (!data->ignore)
1097 merge_stree(&data->final_states, stree);
1098 free_stree(&stree);
1099 __push_fake_cur_stree();
1100 __unnullify_path();
1101 data->prev_func_id = func_id;
1102 data->ignore = 0;
1103 }
1104
1105 if (data->ignore)
1106 return 0;
1107 if (type == INTERNAL &&
1108 !function_signature_matches(value)) {
1109 data->ignore = 1;
1110 return 0;
1111 }
1112
1113 if (param >= 0 && !get_param(param, &name, &sym))
1114 return 0;
1115
1116 FOR_EACH_PTR(select_caller_info_callbacks, def_callback) {
1117 if (def_callback->hook_type == type)
1118 def_callback->callback(name, sym, key, value);
1119 } END_FOR_EACH_PTR(def_callback);
1120
1121 return 0;
1122 }
1123
1124 static struct string_list *ptr_names_done;
1125 static struct string_list *ptr_names;
1126
1127 static int get_ptr_name(void *unused, int argc, char **argv, char **azColName)
1128 {
1129 insert_string(&ptr_names, alloc_string(argv[0]));
1130 return 0;
1131 }
1132
1133 static char *get_next_ptr_name(void)
1134 {
1135 char *ptr;
1136
1137 FOR_EACH_PTR(ptr_names, ptr) {
1138 if (!insert_string(&ptr_names_done, ptr))
1139 continue;
1140 return ptr;
1141 } END_FOR_EACH_PTR(ptr);
1142 return NULL;
1143 }
1144
1145 static void get_ptr_names(const char *file, const char *name)
1146 {
1147 char sql_filter[1024];
1148 int before, after;
1149
1150 if (file) {
1151 snprintf(sql_filter, 1024, "file = '%s' and function = '%s';",
1152 file, name);
1153 } else {
1154 snprintf(sql_filter, 1024, "function = '%s';", name);
1155 }
1156
1157 before = ptr_list_size((struct ptr_list *)ptr_names);
1158
1159 run_sql(get_ptr_name, NULL,
1160 "select distinct ptr from function_ptr where %s",
1161 sql_filter);
1162
1163 after = ptr_list_size((struct ptr_list *)ptr_names);
1164 if (before == after)
1165 return;
1166
1167 while ((name = get_next_ptr_name()))
1168 get_ptr_names(NULL, name);
1169 }
1170
1171 static void match_data_from_db(struct symbol *sym)
1172 {
1173 struct select_caller_info_data data = { .prev_func_id = -1 };
1174 struct sm_state *sm;
1175 struct stree *stree;
1176 struct timeval end_time;
1177
1178 if (!sym || !sym->ident)
1179 return;
1180
1181 set_fn_mtag(sym);
1182 gettimeofday(&data.start_time, NULL);
1183
1184 __push_fake_cur_stree();
1185 __unnullify_path();
1186
1187 if (!__inline_fn) {
1188 char *ptr;
1189
1190 if (sym->ctype.modifiers & MOD_STATIC)
1191 get_ptr_names(get_base_file(), sym->ident->name);
1192 else
1193 get_ptr_names(NULL, sym->ident->name);
1194
1195 if (ptr_list_size((struct ptr_list *)ptr_names) > 20) {
1196 __free_ptr_list((struct ptr_list **)&ptr_names);
1197 __free_ptr_list((struct ptr_list **)&ptr_names_done);
1198 __free_fake_cur_stree();
1199 return;
1200 }
1201
1202 sql_select_caller_info(&data,
1203 "call_id, type, parameter, key, value",
1204 sym);
1205
1206
1207 stree = __pop_fake_cur_stree();
1208 if (!data.ignore)
1209 merge_stree(&data.final_states, stree);
1210 free_stree(&stree);
1211 __push_fake_cur_stree();
1212 __unnullify_path();
1213 data.prev_func_id = -1;
1214 data.ignore = 0;
1215 data.results = 0;
1216
1217 FOR_EACH_PTR(ptr_names, ptr) {
1218 run_sql(caller_info_callback, &data,
1219 "select call_id, type, parameter, key, value"
1220 " from common_caller_info where function = '%s' order by call_id",
1221 ptr);
1222 } END_FOR_EACH_PTR(ptr);
1223
1224 if (data.results) {
1225 FOR_EACH_PTR(ptr_names, ptr) {
1226 free_string(ptr);
1227 } END_FOR_EACH_PTR(ptr);
1228 goto free_ptr_names;
1229 }
1230
1231 FOR_EACH_PTR(ptr_names, ptr) {
1232 run_sql(caller_info_callback, &data,
1233 "select call_id, type, parameter, key, value"
1234 " from caller_info where function = '%s' order by call_id",
1235 ptr);
1236 free_string(ptr);
1237 } END_FOR_EACH_PTR(ptr);
1238
1239 free_ptr_names:
1240 __free_ptr_list((struct ptr_list **)&ptr_names);
1241 __free_ptr_list((struct ptr_list **)&ptr_names_done);
1242 } else {
1243 sql_select_caller_info(&data,
1244 "call_id, type, parameter, key, value",
1245 sym);
1246 }
1247
1248 stree = __pop_fake_cur_stree();
1249 if (!data.ignore)
1250 merge_stree(&data.final_states, stree);
1251 free_stree(&stree);
1252
1253 gettimeofday(&end_time, NULL);
1254 if (end_time.tv_sec - data.start_time.tv_sec <= 10) {
1255 FOR_EACH_SM(data.final_states, sm) {
1256 __set_sm(sm);
1257 } END_FOR_EACH_SM(sm);
1258 }
1259
1260 free_stree(&data.final_states);
1261 }
1262
1263 static int return_implies_callbacks(void *_info, int argc, char **argv, char **azColName)
1264 {
1265 struct implies_info *info = _info;
1266 struct db_implies_callback *cb;
1267 struct expression *arg = NULL;
1268 int type;
1269 int param;
1270
1271 if (argc != 5)
1272 return 0;
1273
1274 type = atoi(argv[1]);
1275 param = atoi(argv[2]);
1276
1277 FOR_EACH_PTR(info->cb_list, cb) {
1278 if (cb->type != type)
1279 continue;
1280 if (param != -1) {
1281 arg = get_argument_from_call_expr(info->expr->args, param);
1282 if (!arg)
1283 continue;
1284 }
1285 cb->callback(info->expr, arg, argv[3], argv[4]);
1286 } END_FOR_EACH_PTR(cb);
1287
1288 return 0;
1289 }
1290
1291 static int call_implies_callbacks(void *_info, int argc, char **argv, char **azColName)
1292 {
1293 struct implies_info *info = _info;
1294 struct db_implies_callback *cb;
1295 struct expression *arg;
1296 struct symbol *sym;
1297 char *name;
1298 int type;
1299 int param;
1300
1301 if (argc != 5)
1302 return 0;
1303
1304 type = atoi(argv[1]);
1305 param = atoi(argv[2]);
1306
1307 if (!get_param(param, &name, &sym))
1308 return 0;
1309 arg = symbol_expression(sym);
1310 if (!arg)
1311 return 0;
1312
1313 FOR_EACH_PTR(info->cb_list, cb) {
1314 if (cb->type != type)
1315 continue;
1316 cb->callback(info->expr, arg, argv[3], argv[4]);
1317 } END_FOR_EACH_PTR(cb);
1318
1319 return 0;
1320 }
1321
1322 static void match_return_implies(struct expression *expr)
1323 {
1324 struct implies_info info = {
1325 .type = RETURN_IMPLIES,
1326 .cb_list = return_implies_cb_list,
1327 };
1328
1329 if (expr->fn->type != EXPR_SYMBOL ||
1330 !expr->fn->symbol)
1331 return;
1332 info.expr = expr;
1333 info.sym = expr->fn->symbol;
1334 sql_select_implies("function, type, parameter, key, value", &info,
1335 return_implies_callbacks);
1336 }
1337
1338 static void match_call_implies(struct symbol *sym)
1339 {
1340 struct implies_info info = {
1341 .type = CALL_IMPLIES,
1342 .cb_list = call_implies_cb_list,
1343 };
1344
1345 if (!sym || !sym->ident)
1346 return;
1347
1348 info.sym = sym;
1349 sql_select_implies("function, type, parameter, key, value", &info,
1350 call_implies_callbacks);
1351 }
1352
1353 static char *get_fn_param_str(struct expression *expr)
1354 {
1355 struct expression *tmp;
1356 int param;
1357 char buf[32];
1358
1359 tmp = get_assigned_expr(expr);
1360 if (tmp)
1361 expr = tmp;
1362 expr = strip_expr(expr);
1363 if (!expr || expr->type != EXPR_CALL)
1364 return NULL;
1365 expr = strip_expr(expr->fn);
1366 if (!expr || expr->type != EXPR_SYMBOL)
1367 return NULL;
1368 param = get_param_num(expr);
1369 if (param < 0)
1370 return NULL;
1371
1372 snprintf(buf, sizeof(buf), "[r $%d]", param);
1373 return alloc_sname(buf);
1374 }
1375
1376 static char *get_return_compare_is_param(struct expression *expr)
1377 {
1378 char *var;
1379 char buf[256];
1380 int comparison;
1381 int param;
1382
1383 param = get_param_num(expr);
1384 if (param < 0)
1385 return NULL;
1386
1387 var = expr_to_var(expr);
1388 if (!var)
1389 return NULL;
1390 snprintf(buf, sizeof(buf), "%s orig", var);
1391 comparison = get_comparison_strings(var, buf);
1392 free_string(var);
1393
1394 if (!comparison)
1395 return NULL;
1396
1397 snprintf(buf, sizeof(buf), "[%s$%d]", show_special(comparison), param);
1398 return alloc_sname(buf);
1399 }
1400
1401 static char *get_return_compare_str(struct expression *expr)
1402 {
1403 char *compare_str;
1404
1405 compare_str = get_return_compare_is_param(expr);
1406 if (compare_str)
1407 return compare_str;
1408
1409 compare_str = expr_lte_to_param(expr, -1);
1410 if (compare_str)
1411 return compare_str;
1412
1413 return expr_param_comparison(expr, -1);
1414 }
1415
1416 static const char *get_return_ranges_str(struct expression *expr, struct range_list **rl_p)
1417 {
1418 struct range_list *rl;
1419 char *return_ranges;
1420 sval_t sval;
1421 char *fn_param_str;
1422 char *compare_str;
1423 char *math_str;
1424 char buf[128];
1425
1426 *rl_p = NULL;
1427
1428 if (!expr)
1429 return alloc_sname("");
1430
1431 if (get_implied_value(expr, &sval)) {
1432 sval = sval_cast(cur_func_return_type(), sval);
1433 *rl_p = alloc_rl(sval, sval);
1434 return sval_to_str_or_err_ptr(sval);
1435 }
1436
1437 fn_param_str = get_fn_param_str(expr);
1438 compare_str = expr_equal_to_param(expr, -1);
1439 math_str = get_value_in_terms_of_parameter_math(expr);
1440
1441 if (get_implied_rl(expr, &rl) && !is_whole_rl(rl)) {
1442 rl = cast_rl(cur_func_return_type(), rl);
1443 return_ranges = show_rl(rl);
1444 } else if (get_imaginary_absolute(expr, &rl)){
1445 rl = cast_rl(cur_func_return_type(), rl);
1446 return alloc_sname(show_rl(rl));
1447 } else {
1448 get_absolute_rl(expr, &rl);
1449 rl = cast_rl(cur_func_return_type(), rl);
1450 return_ranges = show_rl(rl);
1451 }
1452 *rl_p = rl;
1453
1454 if (fn_param_str) {
1455 snprintf(buf, sizeof(buf), "%s%s", return_ranges, fn_param_str);
1456 return alloc_sname(buf);
1457 }
1458 if (compare_str) {
1459 snprintf(buf, sizeof(buf), "%s%s", return_ranges, compare_str);
1460 return alloc_sname(buf);
1461 }
1462 if (math_str) {
1463 snprintf(buf, sizeof(buf), "%s[%s]", return_ranges, math_str);
1464 return alloc_sname(buf);
1465 }
1466 compare_str = get_return_compare_str(expr);
1467 if (compare_str) {
1468 snprintf(buf, sizeof(buf), "%s%s", return_ranges, compare_str);
1469 return alloc_sname(buf);
1470 }
1471
1472 return return_ranges;
1473 }
1474
1475 static void match_return_info(int return_id, char *return_ranges, struct expression *expr)
1476 {
1477 sql_insert_return_states(return_id, return_ranges, INTERNAL, -1, "", function_signature());
1478 }
1479
1480 static bool call_return_state_hooks_conditional(struct expression *expr)
1481 {
1482 int final_pass_orig = final_pass;
1483 static int recurse;
1484
1485 if (recurse >= 2)
1486 return false;
1487 if (!expr ||
1488 (expr->type != EXPR_CONDITIONAL && expr->type != EXPR_SELECT))
1489 return false;
1490
1491 recurse++;
1492
1493 __push_fake_cur_stree();
1494
1495 final_pass = 0;
1496 __split_whole_condition(expr->conditional);
1497 final_pass = final_pass_orig;
1498
1499 call_return_state_hooks(expr->cond_true ?: expr->conditional);
1500
1501 __push_true_states();
1502 __use_false_states();
1503
1504 call_return_state_hooks(expr->cond_false);
1505
1506 __merge_true_states();
1507 __free_fake_cur_stree();
1508
1509 recurse--;
1510 return true;
1511 }
1512
1513 static void call_return_state_hooks_compare(struct expression *expr)
1514 {
1515 struct returned_state_callback *cb;
1516 char *return_ranges;
1517 int final_pass_orig = final_pass;
1518 sval_t sval = { .type = &int_ctype };
1519 sval_t ret;
1520
1521 if (!get_implied_value(expr, &ret))
1522 ret.value = -1;
1523
1524 __push_fake_cur_stree();
1525
1526 final_pass = 0;
1527 __split_whole_condition(expr);
1528 final_pass = final_pass_orig;
1529
1530 if (ret.value != 0) {
1531 return_ranges = alloc_sname("1");
1532 sval.value = 1;
1533 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_sval(sval));
1534
1535 return_id++;
1536 FOR_EACH_PTR(returned_state_callbacks, cb) {
1537 cb->callback(return_id, return_ranges, expr);
1538 } END_FOR_EACH_PTR(cb);
1539 }
1540
1541 __push_true_states();
1542 __use_false_states();
1543
1544 if (ret.value != 1) {
1545 return_ranges = alloc_sname("0");
1546 sval.value = 0;
1547 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_sval(sval));
1548
1549 return_id++;
1550 FOR_EACH_PTR(returned_state_callbacks, cb) {
1551 cb->callback(return_id, return_ranges, expr);
1552 } END_FOR_EACH_PTR(cb);
1553 }
1554
1555 __merge_true_states();
1556 __free_fake_cur_stree();
1557 }
1558
1559 static int ptr_in_list(struct sm_state *sm, struct state_list *slist)
1560 {
1561 struct sm_state *tmp;
1562
1563 FOR_EACH_PTR(slist, tmp) {
1564 if (strcmp(tmp->state->name, sm->state->name) == 0)
1565 return 1;
1566 } END_FOR_EACH_PTR(tmp);
1567
1568 return 0;
1569 }
1570
1571 static int split_possible_helper(struct sm_state *sm, struct expression *expr)
1572 {
1573 struct returned_state_callback *cb;
1574 struct range_list *rl;
1575 char *return_ranges;
1576 struct sm_state *tmp;
1577 int ret = 0;
1578 int nr_possible, nr_states;
1579 char *compare_str;
1580 char buf[128];
1581 struct state_list *already_handled = NULL;
1582 sval_t sval;
1583
1584 if (!sm || !sm->merged)
1585 return 0;
1586
1587 if (too_many_possible(sm))
1588 return 0;
1589
1590 /* bail if it gets too complicated */
1591 nr_possible = 0;
1592 FOR_EACH_PTR(sm->possible, tmp) {
1593 if (tmp->merged)
1594 continue;
1595 if (ptr_in_list(tmp, already_handled))
1596 continue;
1597 add_ptr_list(&already_handled, tmp);
1598 nr_possible++;
1599 } END_FOR_EACH_PTR(tmp);
1600 free_slist(&already_handled);
1601 nr_states = get_db_state_count();
1602 if (nr_states * nr_possible >= 2000)
1603 return 0;
1604
1605 FOR_EACH_PTR(sm->possible, tmp) {
1606 if (tmp->merged)
1607 continue;
1608 if (ptr_in_list(tmp, already_handled))
1609 continue;
1610 add_ptr_list(&already_handled, tmp);
1611
1612 ret = 1;
1613 __push_fake_cur_stree();
1614
1615 overwrite_states_using_pool(sm, tmp);
1616
1617 rl = cast_rl(cur_func_return_type(), estate_rl(tmp->state));
1618 return_ranges = show_rl(rl);
1619 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(clone_rl(rl)));
1620 if (!rl_to_sval(rl, &sval)) {
1621 compare_str = get_return_compare_str(expr);
1622 if (compare_str) {
1623 snprintf(buf, sizeof(buf), "%s%s", return_ranges, compare_str);
1624 return_ranges = alloc_sname(buf);
1625 }
1626 }
1627
1628 return_id++;
1629 FOR_EACH_PTR(returned_state_callbacks, cb) {
1630 cb->callback(return_id, return_ranges, expr);
1631 } END_FOR_EACH_PTR(cb);
1632
1633 __free_fake_cur_stree();
1634 } END_FOR_EACH_PTR(tmp);
1635
1636 free_slist(&already_handled);
1637
1638 return ret;
1639 }
1640
1641 static int call_return_state_hooks_split_possible(struct expression *expr)
1642 {
1643 struct sm_state *sm;
1644
1645 if (!expr || expr_equal_to_param(expr, -1))
1646 return 0;
1647
1648 sm = get_sm_state_expr(SMATCH_EXTRA, expr);
1649 return split_possible_helper(sm, expr);
1650 }
1651
1652 static bool has_possible_negative(struct sm_state *sm)
1653 {
1654 struct sm_state *tmp;
1655
1656 if (!type_signed(estate_type(sm->state)))
1657 return false;
1658
1659 FOR_EACH_PTR(sm->possible, tmp) {
1660 if (!estate_rl(tmp->state))
1661 continue;
1662 if (sval_is_negative(estate_min(tmp->state)) &&
1663 sval_is_negative(estate_max(tmp->state)))
1664 return true;
1665 } END_FOR_EACH_PTR(tmp);
1666
1667 return false;
1668 }
1669
1670 static bool has_separate_zero_null(struct sm_state *sm)
1671 {
1672 struct sm_state *tmp;
1673 sval_t sval;
1674
1675 FOR_EACH_PTR(sm->possible, tmp) {
1676 if (!estate_get_single_value(tmp->state, &sval))
1677 continue;
1678 if (sval.value == 0)
1679 return true;
1680 } END_FOR_EACH_PTR(tmp);
1681
1682 return false;
1683 }
1684
1685 static int split_positive_from_negative(struct expression *expr)
1686 {
1687 struct sm_state *sm;
1688 struct returned_state_callback *cb;
1689 struct range_list *rl;
1690 const char *return_ranges;
1691 struct range_list *ret_rl;
1692 bool separate_zero;
1693 int undo;
1694
1695 /* We're going to print the states 3 times */
1696 if (get_db_state_count() > 10000 / 3)
1697 return 0;
1698
1699 if (!get_implied_rl(expr, &rl) || !rl)
1700 return 0;
1701 /* Forget about INT_MAX and larger */
1702 if (rl_max(rl).value <= 0)
1703 return 0;
1704 if (!sval_is_negative(rl_min(rl)))
1705 return 0;
1706
1707 sm = get_sm_state_expr(SMATCH_EXTRA, expr);
1708 if (!sm)
1709 return 0;
1710 if (!has_possible_negative(sm))
1711 return 0;
1712 separate_zero = has_separate_zero_null(sm);
1713
1714 if (!assume(compare_expression(expr, separate_zero ? '>' : SPECIAL_GTE, zero_expr())))
1715 return 0;
1716
1717 return_id++;
1718 return_ranges = get_return_ranges_str(expr, &ret_rl);
1719 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));
1720 FOR_EACH_PTR(returned_state_callbacks, cb) {
1721 cb->callback(return_id, (char *)return_ranges, expr);
1722 } END_FOR_EACH_PTR(cb);
1723
1724 end_assume();
1725
1726 if (separate_zero) {
1727 undo = assume(compare_expression(expr, SPECIAL_EQUAL, zero_expr()));
1728
1729 return_id++;
1730 return_ranges = get_return_ranges_str(expr, &ret_rl);
1731 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));
1732 FOR_EACH_PTR(returned_state_callbacks, cb) {
1733 cb->callback(return_id, (char *)return_ranges, expr);
1734 } END_FOR_EACH_PTR(cb);
1735
1736 if (undo)
1737 end_assume();
1738 }
1739
1740 undo = assume(compare_expression(expr, '<', zero_expr()));
1741
1742 return_id++;
1743 return_ranges = get_return_ranges_str(expr, &ret_rl);
1744 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));
1745 FOR_EACH_PTR(returned_state_callbacks, cb) {
1746 cb->callback(return_id, (char *)return_ranges, expr);
1747 } END_FOR_EACH_PTR(cb);
1748
1749 if (undo)
1750 end_assume();
1751
1752 return 1;
1753 }
1754
1755 static int call_return_state_hooks_split_null_non_null_zero(struct expression *expr)
1756 {
1757 struct returned_state_callback *cb;
1758 struct range_list *rl;
1759 struct range_list *nonnull_rl;
1760 sval_t null_sval;
1761 struct range_list *null_rl = NULL;
1762 char *return_ranges;
1763 struct sm_state *sm;
1764 struct smatch_state *state;
1765 int nr_states;
1766 int final_pass_orig = final_pass;
1767
1768 if (!expr || expr_equal_to_param(expr, -1))
1769 return 0;
1770 if (expr->type == EXPR_CALL)
1771 return 0;
1772
1773 sm = get_sm_state_expr(SMATCH_EXTRA, expr);
1774 if (!sm)
1775 return 0;
1776 if (ptr_list_size((struct ptr_list *)sm->possible) == 1)
1777 return 0;
1778 state = sm->state;
1779 if (!estate_rl(state))
1780 return 0;
1781 if (estate_min(state).value == 0 && estate_max(state).value == 0)
1782 return 0;
1783 if (has_possible_negative(sm))
1784 return 0;
1785 if (!has_separate_zero_null(sm))
1786 return 0;
1787
1788 nr_states = get_db_state_count();
1789 if (option_info && nr_states >= 1500)
1790 return 0;
1791
1792 rl = estate_rl(state);
1793
1794 __push_fake_cur_stree();
1795
1796 final_pass = 0;
1797 __split_whole_condition(expr);
1798 final_pass = final_pass_orig;
1799
1800 nonnull_rl = rl_filter(rl, rl_zero());
1801 return_ranges = show_rl(nonnull_rl);
1802 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(nonnull_rl));
1803
1804 return_id++;
1805 FOR_EACH_PTR(returned_state_callbacks, cb) {
1806 cb->callback(return_id, return_ranges, expr);
1807 } END_FOR_EACH_PTR(cb);
1808
1809 __push_true_states();
1810 __use_false_states();
1811
1812 return_ranges = alloc_sname("0");
1813 null_sval = sval_type_val(rl_type(rl), 0);
1814 add_range(&null_rl, null_sval, null_sval);
1815 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(null_rl));
1816 return_id++;
1817 FOR_EACH_PTR(returned_state_callbacks, cb) {
1818 cb->callback(return_id, return_ranges, expr);
1819 } END_FOR_EACH_PTR(cb);
1820
1821 __merge_true_states();
1822 __free_fake_cur_stree();
1823
1824 return 1;
1825 }
1826
1827 static bool is_kernel_success_fail(struct sm_state *sm)
1828 {
1829 struct sm_state *tmp;
1830 struct range_list *rl;
1831 bool has_zero = false;
1832 bool has_neg = false;
1833
1834 if (!type_signed(estate_type(sm->state)))
1835 return false;
1836
1837 FOR_EACH_PTR(sm->possible, tmp) {
1838 rl = estate_rl(tmp->state);
1839 if (!rl)
1840 return false;
1841 if (rl_min(rl).value == 0 && rl_max(rl).value == 0) {
1842 has_zero = true;
1843 continue;
1844 }
1845 has_neg = true;
1846 if (rl_min(rl).value >= -4095 && rl_max(rl).value < 0)
1847 continue;
1848 if (strcmp(tmp->state->name, "s32min-(-1)") == 0)
1849 continue;
1850 if (strcmp(tmp->state->name, "s32min-(-1),1-s32max") == 0)
1851 continue;
1852 return false;
1853 } END_FOR_EACH_PTR(tmp);
1854
1855 return has_zero && has_neg;
1856 }
1857
1858 static int call_return_state_hooks_split_success_fail(struct expression *expr)
1859 {
1860 struct sm_state *sm;
1861 struct range_list *rl;
1862 struct range_list *nonzero_rl;
1863 sval_t zero_sval;
1864 struct range_list *zero_rl = NULL;
1865 int nr_states;
1866 struct returned_state_callback *cb;
1867 char *return_ranges;
1868 int final_pass_orig = final_pass;
1869
1870 if (option_project != PROJ_KERNEL)
1871 return 0;
1872
1873 nr_states = get_db_state_count();
1874 if (nr_states > 2000)
1875 return 0;
1876
1877 sm = get_sm_state_expr(SMATCH_EXTRA, expr);
1878 if (!sm)
1879 return 0;
1880 if (ptr_list_size((struct ptr_list *)sm->possible) == 1)
1881 return 0;
1882 if (!is_kernel_success_fail(sm))
1883 return 0;
1884
1885 rl = estate_rl(sm->state);
1886 if (!rl)
1887 return 0;
1888
1889 __push_fake_cur_stree();
1890
1891 final_pass = 0;
1892 __split_whole_condition(expr);
1893 final_pass = final_pass_orig;
1894
1895 nonzero_rl = rl_filter(rl, rl_zero());
1896 nonzero_rl = cast_rl(cur_func_return_type(), nonzero_rl);
1897 return_ranges = show_rl(nonzero_rl);
1898 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(nonzero_rl));
1899
1900 return_id++;
1901 FOR_EACH_PTR(returned_state_callbacks, cb) {
1902 cb->callback(return_id, return_ranges, expr);
1903 } END_FOR_EACH_PTR(cb);
1904
1905 __push_true_states();
1906 __use_false_states();
1907
1908 return_ranges = alloc_sname("0");
1909 zero_sval = sval_type_val(rl_type(rl), 0);
1910 add_range(&zero_rl, zero_sval, zero_sval);
1911 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(zero_rl));
1912 return_id++;
1913 FOR_EACH_PTR(returned_state_callbacks, cb) {
1914 cb->callback(return_id, return_ranges, expr);
1915 } END_FOR_EACH_PTR(cb);
1916
1917 __merge_true_states();
1918 __free_fake_cur_stree();
1919
1920 return 1;
1921 }
1922
1923 static int is_boolean(struct expression *expr)
1924 {
1925 struct range_list *rl;
1926
1927 if (!get_implied_rl(expr, &rl))
1928 return 0;
1929 if (rl_min(rl).value == 0 && rl_max(rl).value == 1)
1930 return 1;
1931 return 0;
1932 }
1933
1934 static int splitable_function_call(struct expression *expr)
1935 {
1936 struct sm_state *sm;
1937 char buf[64];
1938
1939 if (!expr || expr->type != EXPR_CALL)
1940 return 0;
1941 snprintf(buf, sizeof(buf), "return %p", expr);
1942 sm = get_sm_state(SMATCH_EXTRA, buf, NULL);
1943 return split_possible_helper(sm, expr);
1944 }
1945
1946 static struct sm_state *find_bool_param(void)
1947 {
1948 struct stree *start_states;
1949 struct symbol *arg;
1950 struct sm_state *sm, *tmp;
1951 sval_t sval;
1952
1953 start_states = get_start_states();
1954
1955 FOR_EACH_PTR_REVERSE(cur_func_sym->ctype.base_type->arguments, arg) {
1956 if (!arg->ident)
1957 continue;
1958 sm = get_sm_state_stree(start_states, SMATCH_EXTRA, arg->ident->name, arg);
1959 if (!sm)
1960 continue;
1961 if (rl_min(estate_rl(sm->state)).value != 0 ||
1962 rl_max(estate_rl(sm->state)).value != 1)
1963 continue;
1964 goto found;
1965 } END_FOR_EACH_PTR_REVERSE(arg);
1966
1967 return NULL;
1968
1969 found:
1970 /*
1971 * Check if it's splitable. If not, then splitting it up is likely not
1972 * useful for the callers.
1973 */
1974 FOR_EACH_PTR(sm->possible, tmp) {
1975 if (is_merged(tmp))
1976 continue;
1977 if (!estate_get_single_value(tmp->state, &sval))
1978 return NULL;
1979 } END_FOR_EACH_PTR(tmp);
1980
1981 return sm;
1982 }
1983
1984 static int split_on_bool_sm(struct sm_state *sm, struct expression *expr)
1985 {
1986 struct returned_state_callback *cb;
1987 struct range_list *ret_rl;
1988 const char *return_ranges;
1989 struct sm_state *tmp;
1990 int ret = 0;
1991 struct state_list *already_handled = NULL;
1992
1993 if (!sm || !sm->merged)
1994 return 0;
1995
1996 if (too_many_possible(sm))
1997 return 0;
1998
1999 FOR_EACH_PTR(sm->possible, tmp) {
2000 if (tmp->merged)
2001 continue;
2002 if (ptr_in_list(tmp, already_handled))
2003 continue;
2004 add_ptr_list(&already_handled, tmp);
2005
2006 ret = 1;
2007 __push_fake_cur_stree();
2008
2009 overwrite_states_using_pool(sm, tmp);
2010
2011 return_ranges = get_return_ranges_str(expr, &ret_rl);
2012 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));
2013 return_id++;
2014 FOR_EACH_PTR(returned_state_callbacks, cb) {
2015 cb->callback(return_id, (char *)return_ranges, expr);
2016 } END_FOR_EACH_PTR(cb);
2017
2018 __free_fake_cur_stree();
2019 } END_FOR_EACH_PTR(tmp);
2020
2021 free_slist(&already_handled);
2022
2023 return ret;
2024 }
2025
2026 static int split_by_bool_param(struct expression *expr)
2027 {
2028 struct sm_state *start_sm, *sm;
2029 sval_t sval;
2030
2031 start_sm = find_bool_param();
2032 if (!start_sm)
2033 return 0;
2034 sm = get_sm_state(SMATCH_EXTRA, start_sm->name, start_sm->sym);
2035 if (!sm || estate_get_single_value(sm->state, &sval))
2036 return 0;
2037
2038 if (get_db_state_count() * 2 >= 2000)
2039 return 0;
2040
2041 return split_on_bool_sm(sm, expr);
2042 }
2043
2044 static int split_by_null_nonnull_param(struct expression *expr)
2045 {
2046 struct symbol *arg;
2047 struct sm_state *sm;
2048 int nr_possible;
2049
2050 /* function must only take one pointer */
2051 if (ptr_list_size((struct ptr_list *)cur_func_sym->ctype.base_type->arguments) != 1)
2052 return 0;
2053 arg = first_ptr_list((struct ptr_list *)cur_func_sym->ctype.base_type->arguments);
2054 if (!arg->ident)
2055 return 0;
2056 if (get_real_base_type(arg)->type != SYM_PTR)
2057 return 0;
2058
2059 if (param_was_set_var_sym(arg->ident->name, arg))
2060 return 0;
2061 sm = get_sm_state(SMATCH_EXTRA, arg->ident->name, arg);
2062 if (!sm)
2063 return 0;
2064
2065 if (!has_separate_zero_null(sm))
2066 return 0;
2067
2068 nr_possible = ptr_list_size((struct ptr_list *)sm->possible);
2069 if (get_db_state_count() * nr_possible >= 2000)
2070 return 0;
2071
2072 return split_on_bool_sm(sm, expr);
2073 }
2074
2075 struct expression *strip_expr_statement(struct expression *expr)
2076 {
2077 struct expression *orig = expr;
2078 struct statement *stmt, *last_stmt;
2079
2080 if (!expr)
2081 return NULL;
2082 if (expr->type == EXPR_PREOP && expr->op == '(')
2083 expr = expr->unop;
2084 if (expr->type != EXPR_STATEMENT)
2085 return orig;
2086 stmt = expr->statement;
2087 if (!stmt || stmt->type != STMT_COMPOUND)
2088 return orig;
2089
2090 last_stmt = last_ptr_list((struct ptr_list *)stmt->stmts);
2091 if (!last_stmt || last_stmt->type == STMT_LABEL)
2092 last_stmt = last_stmt->label_statement;
2093 if (!last_stmt || last_stmt->type != STMT_EXPRESSION)
2094 return orig;
2095 return strip_expr(last_stmt->expression);
2096 }
2097
2098 static bool is_kernel_error_path(struct expression *expr)
2099 {
2100 struct range_list *rl;
2101
2102 /*
2103 * Splitting up returns requires resources. It also requires resources
2104 * for the caller. It doesn't seem worth it to split anything up.
2105 */
2106 if (!get_implied_rl(expr, &rl))
2107 return false;
2108 if (rl_type(rl) != &int_ctype)
2109 return false;
2110 if (rl_min(rl).value >= -4095 &&
2111 rl_max(rl).value < 0)
2112 return true;
2113 return false;
2114 }
2115
2116 static void call_return_state_hooks(struct expression *expr)
2117 {
2118 struct returned_state_callback *cb;
2119 struct range_list *ret_rl;
2120 const char *return_ranges;
2121 int nr_states;
2122 sval_t sval;
2123
2124 if (__path_is_null())
2125 return;
2126
2127 expr = strip_expr(expr);
2128 expr = strip_expr_statement(expr);
2129
2130 if (is_impossible_path())
2131 goto vanilla;
2132
2133 if (expr && (expr->type == EXPR_COMPARE ||
2134 !get_implied_value(expr, &sval)) &&
2135 (is_condition(expr) || is_boolean(expr))) {
2136 call_return_state_hooks_compare(expr);
2137 return;
2138 } else if (call_return_state_hooks_conditional(expr)) {
2139 return;
2140 } else if (is_kernel_error_path(expr)) {
2141 goto vanilla;
2142 } else if (call_return_state_hooks_split_possible(expr)) {
2143 return;
2144 } else if (split_positive_from_negative(expr)) {
2145 return;
2146 } else if (call_return_state_hooks_split_null_non_null_zero(expr)) {
2147 return;
2148 } else if (call_return_state_hooks_split_success_fail(expr)) {
2149 return;
2150 } else if (splitable_function_call(expr)) {
2151 return;
2152 } else if (split_by_bool_param(expr)) {
2153 } else if (split_by_null_nonnull_param(expr)) {
2154 return;
2155 }
2156
2157 vanilla:
2158 return_ranges = get_return_ranges_str(expr, &ret_rl);
2159 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));
2160
2161 return_id++;
2162 nr_states = get_db_state_count();
2163 if (nr_states >= 10000) {
2164 match_return_info(return_id, (char *)return_ranges, expr);
2165 print_limited_param_set(return_id, (char *)return_ranges, expr);
2166 mark_all_params_untracked(return_id, (char *)return_ranges, expr);
2167 return;
2168 }
2169 FOR_EACH_PTR(returned_state_callbacks, cb) {
2170 cb->callback(return_id, (char *)return_ranges, expr);
2171 } END_FOR_EACH_PTR(cb);
2172 }
2173
2174 static void print_returned_struct_members(int return_id, char *return_ranges, struct expression *expr)
2175 {
2176 struct returned_member_callback *cb;
2177 struct stree *stree;
2178 struct sm_state *sm;
2179 struct symbol *type;
2180 char *name;
2181 char member_name[256];
2182 int len;
2183
2184 type = get_type(expr);
2185 if (!type || type->type != SYM_PTR)
2186 return;
2187 name = expr_to_var(expr);
2188 if (!name)
2189 return;
2190
2191 member_name[sizeof(member_name) - 1] = '\0';
2192 strcpy(member_name, "$");
2193
2194 len = strlen(name);
2195 FOR_EACH_PTR(returned_member_callbacks, cb) {
2196 stree = __get_cur_stree();
2197 FOR_EACH_MY_SM(cb->owner, stree, sm) {
2198 if (sm->name[0] == '*' && strcmp(sm->name + 1, name) == 0) {
2199 strcpy(member_name, "*$");
2200 cb->callback(return_id, return_ranges, expr, member_name, sm->state);
2201 continue;
2202 }
2203 if (strncmp(sm->name, name, len) != 0)
2204 continue;
2205 if (strncmp(sm->name + len, "->", 2) != 0)
2206 continue;
2207 snprintf(member_name, sizeof(member_name), "$%s", sm->name + len);
2208 cb->callback(return_id, return_ranges, expr, member_name, sm->state);
2209 } END_FOR_EACH_SM(sm);
2210 } END_FOR_EACH_PTR(cb);
2211
2212 free_string(name);
2213 }
2214
2215 static void reset_memdb(struct symbol *sym)
2216 {
2217 mem_sql(NULL, NULL, "delete from caller_info;");
2218 mem_sql(NULL, NULL, "delete from return_states;");
2219 mem_sql(NULL, NULL, "delete from call_implies;");
2220 mem_sql(NULL, NULL, "delete from return_implies;");
2221 }
2222
2223 static void match_end_func_info(struct symbol *sym)
2224 {
2225 if (__path_is_null())
2226 return;
2227 call_return_state_hooks(NULL);
2228 }
2229
2230 static void match_after_func(struct symbol *sym)
2231 {
2232 if (!__inline_fn)
2233 reset_memdb(sym);
2234 }
2235
2236 static void init_memdb(void)
2237 {
2238 char *err = NULL;
2239 int rc;
2240 const char *schema_files[] = {
2241 "db/db.schema",
2242 "db/caller_info.schema",
2243 "db/common_caller_info.schema",
2244 "db/return_states.schema",
2245 "db/function_type_size.schema",
2246 "db/type_size.schema",
2247 "db/function_type_info.schema",
2248 "db/type_info.schema",
2249 "db/call_implies.schema",
2250 "db/return_implies.schema",
2251 "db/function_ptr.schema",
2252 "db/local_values.schema",
2253 "db/function_type_value.schema",
2254 "db/type_value.schema",
2255 "db/function_type.schema",
2256 "db/data_info.schema",
2257 "db/parameter_name.schema",
2258 "db/constraints.schema",
2259 "db/constraints_required.schema",
2260 "db/fn_ptr_data_link.schema",
2261 "db/fn_data_link.schema",
2262 "db/mtag_about.schema",
2263 "db/mtag_info.schema",
2264 "db/mtag_map.schema",
2265 "db/mtag_data.schema",
2266 "db/mtag_alias.schema",
2267 };
2268 static char buf[4096];
2269 int fd;
2270 int ret;
2271 int i;
2272
2273 rc = sqlite3_open(":memory:", &mem_db);
2274 if (rc != SQLITE_OK) {
2275 sm_ierror("starting In-Memory database.");
2276 return;
2277 }
2278
2279 for (i = 0; i < ARRAY_SIZE(schema_files); i++) {
2280 fd = open_schema_file(schema_files[i]);
2281 if (fd < 0)
2282 continue;
2283 ret = read(fd, buf, sizeof(buf));
2284 if (ret < 0) {
2285 sm_ierror("failed to read: %s", schema_files[i]);
2286 continue;
2287 }
2288 close(fd);
2289 if (ret == sizeof(buf)) {
2290 sm_ierror("Schema file too large: %s (limit %zd bytes)",
2291 schema_files[i], sizeof(buf));
2292 continue;
2293 }
2294 buf[ret] = '\0';
2295 rc = sqlite3_exec(mem_db, buf, NULL, NULL, &err);
2296 if (rc != SQLITE_OK) {
2297 sm_ierror("SQL error #2: %s", err);
2298 sm_ierror("%s", buf);
2299 }
2300 }
2301 }
2302
2303 static void init_cachedb(void)
2304 {
2305 char *err = NULL;
2306 int rc;
2307 const char *schema_files[] = {
2308 "db/call_implies.schema",
2309 "db/return_implies.schema",
2310 "db/type_info.schema",
2311 "db/mtag_about.schema",
2312 "db/mtag_data.schema",
2313 "db/mtag_info.schema",
2314 "db/sink_info.schema",
2315 };
2316 static char buf[4096];
2317 int fd;
2318 int ret;
2319 int i;
2320
2321 rc = sqlite3_open(":memory:", &cache_db);
2322 if (rc != SQLITE_OK) {
2323 sm_ierror("starting In-Memory database.");
2324 return;
2325 }
2326
2327 for (i = 0; i < ARRAY_SIZE(schema_files); i++) {
2328 fd = open_schema_file(schema_files[i]);
2329 if (fd < 0)
2330 continue;
2331 ret = read(fd, buf, sizeof(buf));
2332 if (ret < 0) {
2333 sm_ierror("failed to read: %s", schema_files[i]);
2334 continue;
2335 }
2336 close(fd);
2337 if (ret == sizeof(buf)) {
2338 sm_ierror("Schema file too large: %s (limit %zd bytes)",
2339 schema_files[i], sizeof(buf));
2340 continue;
2341 }
2342 buf[ret] = '\0';
2343 rc = sqlite3_exec(cache_db, buf, NULL, NULL, &err);
2344 if (rc != SQLITE_OK) {
2345 sm_ierror("SQL error #2: %s", err);
2346 sm_ierror("%s", buf);
2347 }
2348 }
2349 }
2350
2351 static int save_cache_data(void *_table, int argc, char **argv, char **azColName)
2352 {
2353 static char buf[4096];
2354 char tmp[256];
2355 char *p = buf;
2356 char *table = _table;
2357 int i;
2358
2359
2360 p += snprintf(p, 4096 - (p - buf), "insert or ignore into %s values (", table);
2361 for (i = 0; i < argc; i++) {
2362 if (i)
2363 p += snprintf(p, 4096 - (p - buf), ", ");
2364 sqlite3_snprintf(sizeof(tmp), tmp, "%q", escape_newlines(argv[i]));
2365 p += snprintf(p, 4096 - (p - buf), "'%s'", tmp);
2366
2367 }
2368 p += snprintf(p, 4096 - (p - buf), ");");
2369 if (p - buf > 4096)
2370 return 0;
2371
2372 sm_msg("SQL: %s", buf);
2373 return 0;
2374 }
2375
2376 static void dump_cache(struct symbol_list *sym_list)
2377 {
2378 const char *cache_tables[] = {
2379 "type_info", "return_implies", "call_implies", "mtag_data",
2380 "mtag_info", "mtag_about", "sink_info",
2381 };
2382 char buf[64];
2383 int i;
2384
2385 if (!option_info)
2386 return;
2387
2388 for (i = 0; i < ARRAY_SIZE(cache_tables); i++) {
2389 snprintf(buf, sizeof(buf), "select * from %s;", cache_tables[i]);
2390 cache_sql(&save_cache_data, (char *)cache_tables[i], buf);
2391 }
2392 }
2393
2394 void open_smatch_db(char *db_file)
2395 {
2396 int rc;
2397
2398 if (option_no_db)
2399 return;
2400
2401 use_states = malloc(num_checks + 1);
2402 memset(use_states, 0xff, num_checks + 1);
2403
2404 init_memdb();
2405 init_cachedb();
2406
2407 rc = sqlite3_open_v2(db_file, &smatch_db, SQLITE_OPEN_READONLY, NULL);
2408 if (rc != SQLITE_OK) {
2409 option_no_db = 1;
2410 return;
2411 }
2412 run_sql(NULL, NULL,
2413 "PRAGMA cache_size = %d;", SQLITE_CACHE_PAGES);
2414 return;
2415 }
2416
2417 static void register_common_funcs(void)
2418 {
2419 struct token *token;
2420 char *func;
2421 char filename[256];
2422
2423 if (option_project == PROJ_NONE)
2424 strcpy(filename, "common_functions");
2425 else
2426 snprintf(filename, 256, "%s.common_functions", option_project_str);
2427
2428 token = get_tokens_file(filename);
2429 if (!token)
2430 return;
2431 if (token_type(token) != TOKEN_STREAMBEGIN)
2432 return;
2433 token = token->next;
2434 while (token_type(token) != TOKEN_STREAMEND) {
2435 if (token_type(token) != TOKEN_IDENT)
2436 return;
2437 func = alloc_string(show_ident(token->ident));
2438 add_ptr_list(&common_funcs, func);
2439 token = token->next;
2440 }
2441 clear_token_alloc();
2442 }
2443
2444 static char *get_next_string(char **str)
2445 {
2446 static char string[256];
2447 char *start;
2448 char *p = *str;
2449 int len, i, j;
2450
2451 if (*p == '\0')
2452 return NULL;
2453 start = p;
2454
2455 while (*p != '\0' && *p != '\n') {
2456 if (*p == '\\' && *(p + 1) == ' ') {
2457 p += 2;
2458 continue;
2459 }
2460 if (*p == ' ')
2461 break;
2462 p++;
2463 }
2464
2465 len = p - start;
2466 if (len >= sizeof(string)) {
2467 memcpy(string, start, sizeof(string));
2468 string[sizeof(string) - 1] = '\0';
2469 sm_ierror("return_fix: '%s' too long", string);
2470 **str = '\0';
2471 return NULL;
2472 }
2473 memcpy(string, start, len);
2474 string[len] = '\0';
2475 for (i = 0; i < sizeof(string) - 1; i++) {
2476 if (string[i] == '\\' && string[i + 1] == ' ') {
2477 for (j = i; string[j] != '\0'; j++)
2478 string[j] = string[j + 1];
2479 }
2480 }
2481 if (*p != '\0')
2482 p++;
2483 *str = p;
2484 return string;
2485 }
2486
2487 static void register_return_replacements(void)
2488 {
2489 char *func, *orig, *new;
2490 char filename[256];
2491 char buf[4096];
2492 int fd, ret, i;
2493 char *p;
2494
2495 snprintf(filename, 256, "db/%s.return_fixes", option_project_str);
2496 fd = open_schema_file(filename);
2497 if (fd < 0)
2498 return;
2499 ret = read(fd, buf, sizeof(buf));
2500 close(fd);
2501 if (ret < 0)
2502 return;
2503 if (ret == sizeof(buf)) {
2504 sm_ierror("file too large: %s (limit %zd bytes)",
2505 filename, sizeof(buf));
2506 return;
2507 }
2508 buf[ret] = '\0';
2509
2510 p = buf;
2511 while (*p) {
2512 get_next_string(&p);
2513 replace_count++;
2514 }
2515 if (replace_count == 0 || replace_count % 3 != 0) {
2516 replace_count = 0;
2517 return;
2518 }
2519 replace_table = malloc(replace_count * sizeof(char *));
2520
2521 p = buf;
2522 i = 0;
2523 while (*p) {
2524 func = alloc_string(get_next_string(&p));
2525 orig = alloc_string(get_next_string(&p));
2526 new = alloc_string(get_next_string(&p));
2527
2528 replace_table[i++] = func;
2529 replace_table[i++] = orig;
2530 replace_table[i++] = new;
2531 }
2532 }
2533
2534 void register_definition_db_callbacks(int id)
2535 {
2536 add_hook(&match_call_info, FUNCTION_CALL_HOOK);
2537 add_hook(&match_call_info_new, FUNCTION_CALL_HOOK);
2538 add_split_return_callback(match_return_info);
2539 add_split_return_callback(print_returned_struct_members);
2540 add_hook(&call_return_state_hooks, RETURN_HOOK);
2541 add_hook(&match_end_func_info, END_FUNC_HOOK);
2542 add_hook(&match_after_func, AFTER_FUNC_HOOK);
2543
2544 add_hook(&match_data_from_db, FUNC_DEF_HOOK);
2545 add_hook(&match_call_implies, FUNC_DEF_HOOK);
2546 add_hook(&match_return_implies, CALL_HOOK_AFTER_INLINE);
2547
2548 register_common_funcs();
2549 register_return_replacements();
2550
2551 add_hook(&dump_cache, END_FILE_HOOK);
2552 }
2553
2554 void register_db_call_marker(int id)
2555 {
2556 add_hook(&match_call_marker, FUNCTION_CALL_HOOK);
2557 }
2558
2559 char *return_state_to_var_sym(struct expression *expr, int param, const char *key, struct symbol **sym)
2560 {
2561 struct expression *arg;
2562 char *name = NULL;
2563 char member_name[256];
2564
2565 *sym = NULL;
2566
2567 if (param == -1) {
2568 const char *star = "";
2569
2570 if (expr->type != EXPR_ASSIGNMENT)
2571 return NULL;
2572 if (get_type(expr->left) == &int_ctype && strcmp(key, "$") != 0)
2573 return NULL;
2574 name = expr_to_var_sym(expr->left, sym);
2575 if (!name)
2576 return NULL;
2577 if (key[0] == '*') {
2578 star = "*";
2579 key++;
2580 }
2581 if (strncmp(key, "$", 1) != 0)
2582 return name;
2583 snprintf(member_name, sizeof(member_name), "%s%s%s", star, name, key + 1);
2584 free_string(name);
2585 return alloc_string(member_name);
2586 }
2587
2588 while (expr->type == EXPR_ASSIGNMENT)
2589 expr = strip_expr(expr->right);
2590 if (expr->type != EXPR_CALL)
2591 return NULL;
2592
2593 arg = get_argument_from_call_expr(expr->args, param);
2594 if (!arg)
2595 return NULL;
2596
2597 return get_variable_from_key(arg, key, sym);
2598 }
2599
2600 char *get_variable_from_key(struct expression *arg, const char *key, struct symbol **sym)
2601 {
2602 struct symbol *type;
2603 char buf[256];
2604 char *tmp;
2605 int star_cnt = 0;
2606 bool add_dot = false;
2607
2608 if (!arg)
2609 return NULL;
2610
2611 arg = strip_expr(arg);
2612
2613 if (strcmp(key, "$") == 0)
2614 return expr_to_var_sym(arg, sym);
2615
2616 if (strcmp(key, "*$") == 0) {
2617 if (arg->type == EXPR_PREOP && arg->op == '&') {
2618 arg = strip_expr(arg->unop);
2619 return expr_to_var_sym(arg, sym);
2620 } else {
2621 tmp = expr_to_var_sym(arg, sym);
2622 if (!tmp)
2623 return NULL;
2624 snprintf(buf, sizeof(buf), "*%s", tmp);
2625 free_string(tmp);
2626 return alloc_string(buf);
2627 }
2628 }
2629
2630 if (strncmp(key, "(*$)", 4) == 0) {
2631 char buf[64];
2632
2633 if (arg->type == EXPR_PREOP && arg->op == '&') {
2634 arg = strip_expr(arg->unop);
2635 snprintf(buf, sizeof(buf), "$%s", key + 4);
2636 return get_variable_from_key(arg, buf, sym);
2637 } else {
2638 tmp = expr_to_var_sym(arg, sym);
2639 if (!tmp)
2640 return NULL;
2641 snprintf(buf, sizeof(buf), "(*%s)%s", tmp, key + 4);
2642 free_string(tmp);
2643 return alloc_string(buf);
2644 }
2645 }
2646
2647 while (key[0] == '*') {
2648 star_cnt++;
2649 key++;
2650 }
2651
2652 /*
2653 * FIXME: This is a hack.
2654 * We should be able to parse expressions like (*$)->foo and *$->foo.
2655 */
2656 type = get_type(arg);
2657 if (is_struct_ptr(type))
2658 add_dot = true;
2659
2660 if (arg->type == EXPR_PREOP && arg->op == '&' && star_cnt && !add_dot) {
2661 arg = strip_expr(arg->unop);
2662 star_cnt--;
2663 }
2664
2665 if (arg->type == EXPR_PREOP && arg->op == '&') {
2666 arg = strip_expr(arg->unop);
2667 tmp = expr_to_var_sym(arg, sym);
2668 if (!tmp)
2669 return NULL;
2670 snprintf(buf, sizeof(buf), "%.*s%s.%s",
2671 star_cnt, "**********", tmp, key + 3);
2672 return alloc_string(buf);
2673 }
2674
2675 tmp = expr_to_var_sym(arg, sym);
2676 if (!tmp)
2677 return NULL;
2678 snprintf(buf, sizeof(buf), "%.*s%s%s", star_cnt, "**********", tmp, key + 1);
2679 free_string(tmp);
2680 return alloc_string(buf);
2681 }
2682
2683 char *get_chunk_from_key(struct expression *arg, char *key, struct symbol **sym, struct var_sym_list **vsl)
2684 {
2685 *vsl = NULL;
2686
2687 if (strcmp("$", key) == 0)
2688 return expr_to_chunk_sym_vsl(arg, sym, vsl);
2689 return get_variable_from_key(arg, key, sym);
2690 }
2691
2692 const char *state_name_to_param_name(const char *state_name, const char *param_name)
2693 {
2694 int star_cnt = 0;
2695 int name_len;
2696 char buf[256];
2697
2698 name_len = strlen(param_name);
2699
2700 while (state_name[0] == '*') {
2701 star_cnt++;
2702 state_name++;
2703 }
2704
2705 /* ten out of ten stars! */
2706 if (star_cnt > 10)
2707 return NULL;
2708
2709 if (strncmp(state_name, "(*", 2) == 0 &&
2710 strncmp(state_name + 2, param_name, name_len) == 0 &&
2711 state_name[name_len + 2] == ')') {
2712 snprintf(buf, sizeof(buf), "%.*s(*$)%s", star_cnt, "**********",
2713 state_name + name_len + 3);
2714 return alloc_sname(buf);
2715 }
2716
2717 if (strcmp(state_name, param_name) == 0) {
2718 snprintf(buf, sizeof(buf), "%.*s$", star_cnt, "**********");
2719 return alloc_sname(buf);
2720 }
2721
2722 if (state_name[name_len] == '-' && /* check for '-' from "->" */
2723 strncmp(state_name, param_name, name_len) == 0) {
2724 snprintf(buf, sizeof(buf), "%.*s$%s", star_cnt, "**********", state_name + name_len);
2725 return alloc_sname(buf);
2726 }
2727 return NULL;
2728 }
2729
2730 const char *get_param_name_var_sym(const char *name, struct symbol *sym)
2731 {
2732 if (!sym || !sym->ident)
2733 return NULL;
2734
2735 return state_name_to_param_name(name, sym->ident->name);
2736 }
2737
2738 const char *get_mtag_name_var_sym(const char *state_name, struct symbol *sym)
2739 {
2740 struct symbol *type;
2741 const char *sym_name;
2742 int name_len;
2743 static char buf[256];
2744
2745 /*
2746 * mtag_name is different from param_name because mtags can be a struct
2747 * instead of a struct pointer. But we want to treat it like a pointer
2748 * because really an mtag is a pointer. Or in other words, if you pass
2749 * a struct foo then you want to talk about foo.bar but with an mtag
2750 * you want to refer to it as foo->bar.
2751 *
2752 */
2753
2754 if (!sym || !sym->ident)
2755 return NULL;
2756
2757 type = get_real_base_type(sym);
2758 if (type && type->type == SYM_BASETYPE)
2759 return "*$";
2760
2761 sym_name = sym->ident->name;
2762 name_len = strlen(sym_name);
2763
2764 if (state_name[name_len] == '.' && /* check for '-' from "->" */
2765 strncmp(state_name, sym_name, name_len) == 0) {
2766 snprintf(buf, sizeof(buf), "$->%s", state_name + name_len + 1);
2767 return buf;
2768 }
2769
2770 return state_name_to_param_name(state_name, sym_name);
2771 }
2772
2773 const char *get_mtag_name_expr(struct expression *expr)
2774 {
2775 char *name;
2776 struct symbol *sym;
2777 const char *ret = NULL;
2778
2779 name = expr_to_var_sym(expr, &sym);
2780 if (!name || !sym)
2781 goto free;
2782
2783 ret = get_mtag_name_var_sym(name, sym);
2784 free:
2785 free_string(name);
2786 return ret;
2787 }
2788
2789 const char *get_param_name(struct sm_state *sm)
2790 {
2791 return get_param_name_var_sym(sm->name, sm->sym);
2792 }
2793
2794 char *get_data_info_name(struct expression *expr)
2795 {
2796 struct symbol *sym;
2797 char *name;
2798 char buf[256];
2799 char *ret = NULL;
2800
2801 expr = strip_expr(expr);
2802 name = get_member_name(expr);
2803 if (name)
2804 return name;
2805 name = expr_to_var_sym(expr, &sym);
2806 if (!name || !sym)
2807 goto free;
2808 if (!(sym->ctype.modifiers & MOD_TOPLEVEL))
2809 goto free;
2810 if (sym->ctype.modifiers & MOD_STATIC)
2811 snprintf(buf, sizeof(buf), "static %s", name);
2812 else
2813 snprintf(buf, sizeof(buf), "global %s", name);
2814 ret = alloc_sname(buf);
2815 free:
2816 free_string(name);
2817 return ret;
2818 }
Static analysis for C