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