?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
sizeof_param: remove read_rom() from checked functions
[smatch.git] / smatch_db.c
blobe2e0f0fc97966f7bc707fa11f188cde18b69e5c9
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 <sqlite3.h>
21 #include <unistd.h>
22 #include <ctype.h>
23 #include "smatch.h"
24 #include "smatch_slist.h"
25 #include "smatch_extra.h"
26
27 static sqlite3 *db;
28 static sqlite3 *mem_db;
29
30 static int return_id;
31
32 #define sql_insert(table, values...) \
33 do { \
34 if (!mem_db) \
35 break; \
36 if (__inline_fn) { \
37 char buf[1024]; \
38 char *err, *p = buf; \
39 int rc; \
40 \
41 p += snprintf(p, buf + sizeof(buf) - p, \
42 "insert into %s values (", #table); \
43 p += snprintf(p, buf + sizeof(buf) - p, values); \
44 p += snprintf(p, buf + sizeof(buf) - p, ");"); \
45 sm_debug("in-mem: %s\n", buf); \
46 rc = sqlite3_exec(mem_db, buf, NULL, 0, &err); \
47 if (rc != SQLITE_OK) { \
48 fprintf(stderr, "SQL error #2: %s\n", err); \
49 fprintf(stderr, "SQL: '%s'\n", buf); \
50 } \
51 break; \
52 } \
53 if (option_info) { \
54 sm_prefix(); \
55 sm_printf("SQL: insert into " #table " values (" values); \
56 sm_printf(");\n"); \
57 } \
58 } while (0)
59
60 struct def_callback {
61 int hook_type;
62 void (*callback)(const char *name, struct symbol *sym, char *key, char *value);
63 };
64 ALLOCATOR(def_callback, "definition db hook callbacks");
65 DECLARE_PTR_LIST(callback_list, struct def_callback);
66 static struct callback_list *callbacks;
67
68 struct member_info_callback {
69 int owner;
70 void (*callback)(struct expression *call, int param, char *printed_name, struct sm_state *sm);
71 };
72 ALLOCATOR(member_info_callback, "caller_info callbacks");
73 DECLARE_PTR_LIST(member_info_cb_list, struct member_info_callback);
74 static struct member_info_cb_list *member_callbacks;
75
76 struct returned_state_callback {
77 void (*callback)(int return_id, char *return_ranges, struct expression *return_expr);
78 };
79 ALLOCATOR(returned_state_callback, "returned state callbacks");
80 DECLARE_PTR_LIST(returned_state_cb_list, struct returned_state_callback);
81 static struct returned_state_cb_list *returned_state_callbacks;
82
83 struct returned_member_callback {
84 int owner;
85 void (*callback)(int return_id, char *return_ranges, struct expression *expr, char *printed_name, struct smatch_state *state);
86 };
87 ALLOCATOR(returned_member_callback, "returned member callbacks");
88 DECLARE_PTR_LIST(returned_member_cb_list, struct returned_member_callback);
89 static struct returned_member_cb_list *returned_member_callbacks;
90
91 struct call_implies_callback {
92 int type;
93 void (*callback)(struct expression *arg, char *key, char *value);
94 };
95 ALLOCATOR(call_implies_callback, "call_implies callbacks");
96 DECLARE_PTR_LIST(call_implies_cb_list, struct call_implies_callback);
97 static struct call_implies_cb_list *call_implies_cb_list;
98
99 static int print_sql_output(void *unused, int argc, char **argv, char **azColName)
100 {
101 int i;
102
103 for (i = 0; i < argc; i++) {
104 if (i != 0)
105 printf(", ");
106 sm_printf("%s", argv[i]);
107 }
108 sm_printf("\n");
109 return 0;
110 }
111
112 void debug_sql(const char *sql)
113 {
114 if (!option_debug)
115 return;
116 sm_msg("%s", sql);
117 sql_exec(print_sql_output, NULL, sql);
118 }
119
120 void debug_mem_sql(const char *sql)
121 {
122 if (!option_debug)
123 return;
124 sm_msg("%s", sql);
125 sql_mem_exec(print_sql_output, NULL, sql);
126 }
127
128 void sql_exec(int (*callback)(void*, int, char**, char**), void *data, const char *sql)
129 {
130 char *err = NULL;
131 int rc;
132
133 if (option_no_db || !db)
134 return;
135
136 rc = sqlite3_exec(db, sql, callback, data, &err);
137 if (rc != SQLITE_OK) {
138 fprintf(stderr, "SQL error #2: %s\n", err);
139 fprintf(stderr, "SQL: '%s'\n", sql);
140 }
141 }
142
143 void sql_mem_exec(int (*callback)(void*, int, char**, char**), void *data, const char *sql)
144 {
145 char *err = NULL;
146 int rc;
147
148 if (!mem_db)
149 return;
150
151 rc = sqlite3_exec(mem_db, sql, callback, data, &err);
152 if (rc != SQLITE_OK) {
153 fprintf(stderr, "SQL error #2: %s\n", err);
154 fprintf(stderr, "SQL: '%s'\n", sql);
155 }
156 }
157
158 void sql_insert_return_states(int return_id, const char *return_ranges,
159 int type, int param, const char *key, const char *value)
160 {
161 if (key && strlen(key) >= 80)
162 return;
163 sql_insert(return_states, "'%s', '%s', %lu, %d, '%s', %d, %d, %d, '%s', '%s'",
164 get_base_file(), get_function(), (unsigned long)__inline_fn,
165 return_id, return_ranges, fn_static(), type, param, key, value);
166 }
167
168 static struct string_list *common_funcs;
169 static int is_common_function(const char *fn)
170 {
171 char *tmp;
172
173 if (strncmp(fn, "__builtin_", 10) == 0)
174 return 1;
175
176 FOR_EACH_PTR(common_funcs, tmp) {
177 if (strcmp(tmp, fn) == 0)
178 return 1;
179 } END_FOR_EACH_PTR(tmp);
180
181 return 0;
182 }
183
184 void sql_insert_caller_info(struct expression *call, int type,
185 int param, const char *key, const char *value)
186 {
187 char *fn;
188
189 if (!option_info && !__inline_call)
190 return;
191
192 if (key && strlen(key) >= 80)
193 return;
194
195 fn = get_fnptr_name(call->fn);
196 if (!fn)
197 return;
198
199 if (__inline_call) {
200 mem_sql(NULL, NULL,
201 "insert into caller_info values ('%s', '%s', '%s', %lu, %d, %d, %d, '%s', '%s');",
202 get_base_file(), get_function(), fn, (unsigned long)call,
203 is_static(call->fn), type, param, key, value);
204 }
205
206 if (!option_info)
207 return;
208
209 if (is_common_function(fn))
210 return;
211
212 sm_msg("SQL_caller_info: insert into caller_info values ("
213 "'%s', '%s', '%s', %%CALL_ID%%, %d, %d, %d, '%s', '%s');",
214 get_base_file(), get_function(), fn, is_static(call->fn),
215 type, param, key, value);
216
217 free_string(fn);
218 }
219
220 void sql_insert_function_ptr(const char *fn, const char *struct_name)
221 {
222 sql_insert(function_ptr, "'%s', '%s', '%s', 0", get_base_file(), fn,
223 struct_name);
224 }
225
226 void sql_insert_call_implies(int type, int param, const char *key, const char *value)
227 {
228 sql_insert(call_implies, "'%s', '%s', %lu, %d, %d, %d, '%s', %s", get_base_file(),
229 get_function(), (unsigned long)__inline_fn, fn_static(),
230 type, param, key, value);
231 }
232
233 void sql_insert_function_type_size(const char *member, const char *ranges)
234 {
235 sql_insert(function_type_size, "'%s', '%s', '%s', '%s'", get_base_file(), get_function(), member, ranges);
236 }
237
238 void sql_insert_local_values(const char *name, const char *value)
239 {
240 sql_insert(local_values, "'%s', '%s', '%s'", get_base_file(), name, value);
241 }
242
243 void sql_insert_function_type_value(const char *type, const char *value)
244 {
245 sql_insert(function_type_value, "'%s', '%s', '%s', '%s'", get_base_file(), get_function(), type, value);
246 }
247
248 void sql_insert_function_type_info(int param, const char *value)
249 {
250 sql_insert(function_type_info, "'%s', '%s', %d, %d, '%s'",
251 get_base_file(), get_function(), fn_static(), param, value);
252 }
253
254 void sql_insert_data_info(struct expression *data, int type, const char *value)
255 {
256 char *data_name;
257
258 data_name = get_data_info_name(data);
259 if (!data_name)
260 return;
261 sql_insert(data_info, "'%s', '%s', %d, '%s'", get_base_file(), data_name, type, value);
262 }
263
264 char *get_static_filter(struct symbol *sym)
265 {
266 static char sql_filter[1024];
267
268 if (sym->ctype.modifiers & MOD_STATIC) {
269 snprintf(sql_filter, sizeof(sql_filter),
270 "file = '%s' and function = '%s' and static = '1'",
271 get_base_file(), sym->ident->name);
272 } else {
273 snprintf(sql_filter, sizeof(sql_filter),
274 "function = '%s' and static = '0'", sym->ident->name);
275 }
276
277 return sql_filter;
278 }
279
280 static int row_count;
281 static int get_row_count(void *unused, int argc, char **argv, char **azColName)
282 {
283 if (argc != 1)
284 return 0;
285 row_count = atoi(argv[0]);
286 return 0;
287 }
288
289 static void sql_select_return_states_pointer(const char *cols,
290 struct expression *call, int (*callback)(void*, int, char**, char**), void *info)
291 {
292 char *ptr;
293
294 ptr = get_fnptr_name(call->fn);
295 if (!ptr)
296 return;
297
298 run_sql(callback, info,
299 "select %s from return_states join function_ptr where "
300 "return_states.function == function_ptr.function and ptr = '%s'"
301 "and searchable = 1 order by return_id, type;",
302 cols, ptr);
303 }
304
305 static int is_local_symbol(struct expression *expr)
306 {
307 if (expr->type != EXPR_SYMBOL)
308 return 0;
309 if (expr->symbol->ctype.modifiers & (MOD_NONLOCAL | MOD_STATIC | MOD_ADDRESSABLE))
310 return 0;
311 return 1;
312 }
313
314 void sql_select_return_states(const char *cols, struct expression *call,
315 int (*callback)(void*, int, char**, char**), void *info)
316 {
317 if (is_fake_call(call))
318 return;
319
320 if (call->fn->type != EXPR_SYMBOL || !call->fn->symbol || is_local_symbol(call->fn)) {
321 sql_select_return_states_pointer(cols, call, callback, info);
322 return;
323 }
324
325 if (inlinable(call->fn)) {
326 mem_sql(callback, info,
327 "select %s from return_states where call_id = '%lu' order by return_id, type;",
328 cols, (unsigned long)call);
329 return;
330 }
331
332 row_count = 0;
333 run_sql(get_row_count, info, "select count(*) from return_states where %s;",
334 get_static_filter(call->fn->symbol));
335 if (row_count > 3000)
336 return;
337
338 run_sql(callback, info, "select %s from return_states where %s order by return_id, type;",
339 cols, get_static_filter(call->fn->symbol));
340 }
341
342 void sql_select_call_implies(const char *cols, struct expression *call,
343 int (*callback)(void*, int, char**, char**))
344 {
345 if (call->fn->type != EXPR_SYMBOL || !call->fn->symbol)
346 return;
347
348 if (inlinable(call->fn)) {
349 mem_sql(callback, NULL,
350 "select %s from call_implies where call_id = '%lu';",
351 cols, (unsigned long)call);
352 return;
353 }
354
355 run_sql(callback, NULL, "select %s from call_implies where %s;",
356 cols, get_static_filter(call->fn->symbol));
357 }
358
359 void sql_select_caller_info(const char *cols, struct symbol *sym,
360 int (*callback)(void*, int, char**, char**))
361 {
362 if (__inline_fn) {
363 mem_sql(callback, NULL,
364 "select %s from caller_info where call_id = %lu;",
365 cols, (unsigned long)__inline_fn);
366 return;
367 }
368
369 run_sql(callback, NULL,
370 "select %s from caller_info where %s order by call_id;",
371 cols, get_static_filter(sym));
372 }
373
374 void select_caller_info_hook(void (*callback)(const char *name, struct symbol *sym, char *key, char *value), int type)
375 {
376 struct def_callback *def_callback = __alloc_def_callback(0);
377
378 def_callback->hook_type = type;
379 def_callback->callback = callback;
380 add_ptr_list(&callbacks, def_callback);
381 }
382
383 /*
384 * These call backs are used when the --info option is turned on to print struct
385 * member information. For example foo->bar could have a state in
386 * smatch_extra.c and also check_user.c.
387 */
388 void add_member_info_callback(int owner, void (*callback)(struct expression *call, int param, char *printed_name, struct sm_state *sm))
389 {
390 struct member_info_callback *member_callback = __alloc_member_info_callback(0);
391
392 member_callback->owner = owner;
393 member_callback->callback = callback;
394 add_ptr_list(&member_callbacks, member_callback);
395 }
396
397 void add_split_return_callback(void (*fn)(int return_id, char *return_ranges, struct expression *returned_expr))
398 {
399 struct returned_state_callback *callback = __alloc_returned_state_callback(0);
400
401 callback->callback = fn;
402 add_ptr_list(&returned_state_callbacks, callback);
403 }
404
405 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))
406 {
407 struct returned_member_callback *member_callback = __alloc_returned_member_callback(0);
408
409 member_callback->owner = owner;
410 member_callback->callback = callback;
411 add_ptr_list(&returned_member_callbacks, member_callback);
412 }
413
414 void select_call_implies_hook(int type, void (*callback)(struct expression *arg, char *key, char *value))
415 {
416 struct call_implies_callback *cb = __alloc_call_implies_callback(0);
417
418 cb->type = type;
419 cb->callback = callback;
420 add_ptr_list(&call_implies_cb_list, cb);
421 }
422
423 static struct expression *static_call_expr;
424 static struct expression *static_returns_call;
425 static struct symbol *return_type;
426 static struct range_list *return_range_list;
427 static int db_return_callback(void *unused, int argc, char **argv, char **azColName)
428 {
429 struct range_list *rl;
430 struct expression *call_expr = static_returns_call;
431
432 if (argc != 1)
433 return 0;
434 call_results_to_rl(call_expr, return_type, argv[0], &rl);
435 return_range_list = rl_union(return_range_list, rl);
436 return 0;
437 }
438
439 struct range_list *db_return_vals(struct expression *expr)
440 {
441 char buf[64];
442 struct sm_state *sm;
443
444 if (is_fake_call(expr))
445 return NULL;
446
447 snprintf(buf, sizeof(buf), "return %p", expr);
448 sm = get_sm_state(SMATCH_EXTRA, buf, NULL);
449 if (sm)
450 return clone_rl(estate_rl(sm->state));
451 static_returns_call = expr;
452 return_type = get_type(expr);
453 if (!return_type)
454 return NULL;
455
456 if (expr->fn->type != EXPR_SYMBOL || !expr->fn->symbol)
457 return NULL;
458
459 return_range_list = NULL;
460 if (inlinable(expr->fn)) {
461 mem_sql(db_return_callback, NULL,
462 "select distinct return from return_states where call_id = '%lu';",
463 (unsigned long)expr);
464 } else {
465 run_sql(db_return_callback, NULL,
466 "select distinct return from return_states where %s;",
467 get_static_filter(expr->fn->symbol));
468 }
469 return return_range_list;
470 }
471
472 struct range_list *db_return_vals_from_str(const char *fn_name)
473 {
474 static_returns_call = NULL;
475 return_type = &llong_ctype;
476
477 return_range_list = NULL;
478 run_sql(db_return_callback, NULL,
479 "select distinct return from return_states where function = '%s';",
480 fn_name);
481 return return_range_list;
482 }
483
484 static void match_call_marker(struct expression *expr)
485 {
486 /*
487 * we just want to record something in the database so that if we have
488 * two calls like: frob(4); frob(some_unkown); then on the receiving
489 * side we know that sometimes frob is called with unknown parameters.
490 */
491
492 sql_insert_caller_info(expr, INTERNAL, -1, "%call_marker%", "");
493 }
494
495 static void print_struct_members(struct expression *call, struct expression *expr, int param, struct stree *stree,
496 void (*callback)(struct expression *call, int param, char *printed_name, struct sm_state *sm))
497 {
498 struct sm_state *sm;
499 char *name;
500 struct symbol *sym;
501 int len;
502 char printed_name[256];
503 int is_address = 0;
504
505 expr = strip_expr(expr);
506 if (expr->type == EXPR_PREOP && expr->op == '&') {
507 expr = strip_expr(expr->unop);
508 is_address = 1;
509 }
510
511 name = expr_to_var_sym(expr, &sym);
512 if (!name || !sym)
513 goto free;
514
515 len = strlen(name);
516 FOR_EACH_SM(stree, sm) {
517 if (sm->sym != sym)
518 continue;
519 if (strcmp(name, sm->name) == 0) {
520 if (is_address)
521 snprintf(printed_name, sizeof(printed_name), "*$");
522 else /* these are already handled. fixme: handle them here */
523 continue;
524 } else if (sm->name[0] == '*' && strcmp(name, sm->name + 1) == 0) {
525 snprintf(printed_name, sizeof(printed_name), "*$");
526 } else if (strncmp(name, sm->name, len) == 0) {
527 if (isalnum(sm->name[len]))
528 continue;
529 if (is_address)
530 snprintf(printed_name, sizeof(printed_name), "$->%s", sm->name + len + 1);
531 else
532 snprintf(printed_name, sizeof(printed_name), "$%s", sm->name + len);
533 } else {
534 continue;
535 }
536 callback(call, param, printed_name, sm);
537 } END_FOR_EACH_SM(sm);
538 free:
539 free_string(name);
540 }
541
542 static void match_call_info(struct expression *call)
543 {
544 struct member_info_callback *cb;
545 struct expression *arg;
546 struct stree *stree;
547 char *name;
548 int i;
549
550 name = get_fnptr_name(call->fn);
551 if (!name)
552 return;
553
554 FOR_EACH_PTR(member_callbacks, cb) {
555 stree = get_all_states_stree(cb->owner);
556 i = 0;
557 FOR_EACH_PTR(call->args, arg) {
558 print_struct_members(call, arg, i, stree, cb->callback);
559 i++;
560 } END_FOR_EACH_PTR(arg);
561 free_stree(&stree);
562 } END_FOR_EACH_PTR(cb);
563
564 free_string(name);
565 }
566
567 static int get_param(int param, char **name, struct symbol **sym)
568 {
569 struct symbol *arg;
570 int i;
571
572 i = 0;
573 FOR_EACH_PTR(cur_func_sym->ctype.base_type->arguments, arg) {
574 /*
575 * this is a temporary hack to work around a bug (I think in sparse?)
576 * 2.6.37-rc1:fs/reiserfs/journal.o
577 * If there is a function definition without parameter name found
578 * after a function implementation then it causes a crash.
579 * int foo() {}
580 * int bar(char *);
581 */
582 if (arg->ident->name < (char *)100)
583 continue;
584 if (i == param) {
585 *name = arg->ident->name;
586 *sym = arg;
587 return TRUE;
588 }
589 i++;
590 } END_FOR_EACH_PTR(arg);
591
592 return FALSE;
593 }
594
595 static struct stree *final_states;
596 static int prev_func_id = -1;
597 static int caller_info_callback(void *unused, int argc, char **argv, char **azColName)
598 {
599 int func_id;
600 long type;
601 long param;
602 char *key;
603 char *value;
604 char *name = NULL;
605 struct symbol *sym = NULL;
606 struct def_callback *def_callback;
607 struct stree *stree;
608
609 if (argc != 5)
610 return 0;
611
612 func_id = atoi(argv[0]);
613 errno = 0;
614 type = strtol(argv[1], NULL, 10);
615 param = strtol(argv[2], NULL, 10);
616 if (errno)
617 return 0;
618 key = argv[3];
619 value = argv[4];
620
621
622 if (prev_func_id == -1)
623 prev_func_id = func_id;
624 if (func_id != prev_func_id) {
625 stree = __pop_fake_cur_stree();
626 merge_stree(&final_states, stree);
627 free_stree(&stree);
628 __push_fake_cur_stree();
629 __unnullify_path();
630 prev_func_id = func_id;
631 }
632
633 if (param >= 0 && !get_param(param, &name, &sym))
634 return 0;
635
636 FOR_EACH_PTR(callbacks, def_callback) {
637 if (def_callback->hook_type == type)
638 def_callback->callback(name, sym, key, value);
639 } END_FOR_EACH_PTR(def_callback);
640
641 return 0;
642 }
643
644 static void get_direct_callers(struct symbol *sym)
645 {
646 sql_select_caller_info("call_id, type, parameter, key, value", sym,
647 caller_info_callback);
648 }
649
650 static struct string_list *ptr_names_done;
651 static struct string_list *ptr_names;
652
653 static int get_ptr_name(void *unused, int argc, char **argv, char **azColName)
654 {
655 insert_string(&ptr_names, alloc_string(argv[0]));
656 return 0;
657 }
658
659 static char *get_next_ptr_name(void)
660 {
661 char *ptr;
662
663 FOR_EACH_PTR(ptr_names, ptr) {
664 if (list_has_string(ptr_names_done, ptr))
665 continue;
666 insert_string(&ptr_names_done, ptr);
667 return ptr;
668 } END_FOR_EACH_PTR(ptr);
669 return NULL;
670 }
671
672 static void get_ptr_names(const char *file, const char *name)
673 {
674 char sql_filter[1024];
675 int before, after;
676
677 if (file) {
678 snprintf(sql_filter, 1024, "file = '%s' and function = '%s';",
679 file, name);
680 } else {
681 snprintf(sql_filter, 1024, "function = '%s';", name);
682 }
683
684 before = ptr_list_size((struct ptr_list *)ptr_names);
685
686 run_sql(get_ptr_name, NULL,
687 "select distinct ptr from function_ptr where %s",
688 sql_filter);
689
690 after = ptr_list_size((struct ptr_list *)ptr_names);
691 if (before == after)
692 return;
693
694 while ((name = get_next_ptr_name()))
695 get_ptr_names(NULL, name);
696 }
697
698 static void match_data_from_db(struct symbol *sym)
699 {
700 struct sm_state *sm;
701 struct stree *stree;
702
703 if (!sym || !sym->ident)
704 return;
705
706 __push_fake_cur_stree();
707 __unnullify_path();
708 prev_func_id = -1;
709
710 if (!__inline_fn) {
711 char *ptr;
712
713 if (sym->ctype.modifiers & MOD_STATIC)
714 get_ptr_names(get_base_file(), sym->ident->name);
715 else
716 get_ptr_names(NULL, sym->ident->name);
717
718 if (ptr_list_size((struct ptr_list *)ptr_names) > 20) {
719 __free_ptr_list((struct ptr_list **)&ptr_names);
720 __free_ptr_list((struct ptr_list **)&ptr_names_done);
721 stree = __pop_fake_cur_stree();
722 free_stree(&stree);
723 return;
724 }
725
726 get_direct_callers(sym);
727
728 FOR_EACH_PTR(ptr_names, ptr) {
729 run_sql(caller_info_callback, NULL,
730 "select call_id, type, parameter, key, value"
731 " from caller_info where function = '%s' order by call_id",
732 ptr);
733 free_string(ptr);
734 } END_FOR_EACH_PTR(ptr);
735
736 __free_ptr_list((struct ptr_list **)&ptr_names);
737 __free_ptr_list((struct ptr_list **)&ptr_names_done);
738 } else {
739 get_direct_callers(sym);
740 }
741
742 stree = __pop_fake_cur_stree();
743 merge_stree(&final_states, stree);
744 free_stree(&stree);
745
746 FOR_EACH_SM(final_states, sm) {
747 __set_sm(sm);
748 } END_FOR_EACH_SM(sm);
749
750 free_stree(&final_states);
751 }
752
753 static int call_implies_callbacks(void *unused, int argc, char **argv, char **azColName)
754 {
755 struct expression *call_expr = static_call_expr;
756 struct call_implies_callback *cb;
757 struct expression *arg = NULL;
758 int type;
759 int param;
760
761 if (argc != 5)
762 return 0;
763
764 type = atoi(argv[1]);
765 param = atoi(argv[2]);
766
767 FOR_EACH_PTR(call_implies_cb_list, cb) {
768 if (cb->type != type)
769 continue;
770 if (param != -1) {
771 arg = get_argument_from_call_expr(call_expr->args, param);
772 if (!arg)
773 continue;
774 }
775 cb->callback(arg, argv[3], argv[4]);
776 } END_FOR_EACH_PTR(cb);
777
778 return 0;
779 }
780
781 static void match_call_implies(struct expression *expr)
782 {
783 static_call_expr = expr;
784 sql_select_call_implies("function, type, parameter, key, value", expr,
785 call_implies_callbacks);
786 }
787
788 static void print_initializer_list(struct expression_list *expr_list,
789 struct symbol *struct_type)
790 {
791 struct expression *expr;
792 struct symbol *base_type;
793 char struct_name[256];
794
795 FOR_EACH_PTR(expr_list, expr) {
796 if (expr->type == EXPR_INDEX && expr->idx_expression && expr->idx_expression->type == EXPR_INITIALIZER) {
797 print_initializer_list(expr->idx_expression->expr_list, struct_type);
798 continue;
799 }
800 if (expr->type != EXPR_IDENTIFIER)
801 continue;
802 if (!expr->expr_ident)
803 continue;
804 if (!expr->ident_expression || !expr->ident_expression->symbol_name)
805 continue;
806 base_type = get_type(expr->ident_expression);
807 if (!base_type || base_type->type != SYM_FN)
808 continue;
809 snprintf(struct_name, sizeof(struct_name), "(struct %s)->%s",
810 struct_type->ident->name, expr->expr_ident->name);
811 sql_insert_function_ptr(expr->ident_expression->symbol_name->name,
812 struct_name);
813 } END_FOR_EACH_PTR(expr);
814 }
815
816 static void global_variable(struct symbol *sym)
817 {
818 struct symbol *struct_type;
819
820 if (!sym->ident)
821 return;
822 if (!sym->initializer || sym->initializer->type != EXPR_INITIALIZER)
823 return;
824 struct_type = get_base_type(sym);
825 if (!struct_type)
826 return;
827 if (struct_type->type == SYM_ARRAY) {
828 struct_type = get_base_type(struct_type);
829 if (!struct_type)
830 return;
831 }
832 if (struct_type->type != SYM_STRUCT || !struct_type->ident)
833 return;
834 print_initializer_list(sym->initializer->expr_list, struct_type);
835 }
836
837 static void match_return_info(int return_id, char *return_ranges, struct expression *expr)
838 {
839 sql_insert_return_states(return_id, return_ranges, INTERNAL, -1, "", "");
840 }
841
842 static void call_return_state_hooks_conditional(struct expression *expr)
843 {
844 struct returned_state_callback *cb;
845 struct range_list *rl;
846 char *return_ranges;
847 int final_pass_orig = final_pass;
848
849 __push_fake_cur_stree();
850
851 final_pass = 0;
852 __split_whole_condition(expr->conditional);
853 final_pass = final_pass_orig;
854
855 if (get_implied_rl(expr->cond_true, &rl))
856 rl = cast_rl(cur_func_return_type(), rl);
857 else
858 rl = cast_rl(cur_func_return_type(), alloc_whole_rl(get_type(expr->cond_true)));
859 return_ranges = show_rl(rl);
860 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(rl));
861
862 return_id++;
863 FOR_EACH_PTR(returned_state_callbacks, cb) {
864 cb->callback(return_id, return_ranges, expr);
865 } END_FOR_EACH_PTR(cb);
866
867 __push_true_states();
868 __use_false_states();
869
870 if (get_implied_rl(expr->cond_false, &rl))
871 rl = cast_rl(cur_func_return_type(), rl);
872 else
873 rl = cast_rl(cur_func_return_type(), alloc_whole_rl(get_type(expr->cond_false)));
874 return_ranges = show_rl(rl);
875 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(rl));
876
877 return_id++;
878 FOR_EACH_PTR(returned_state_callbacks, cb) {
879 cb->callback(return_id, return_ranges, expr);
880 } END_FOR_EACH_PTR(cb);
881
882 __merge_true_states();
883 __free_fake_cur_stree();
884 }
885
886 static void call_return_state_hooks_compare(struct expression *expr)
887 {
888 struct returned_state_callback *cb;
889 char *return_ranges;
890 int final_pass_orig = final_pass;
891 sval_t sval = { .type = &int_ctype };
892
893 __push_fake_cur_stree();
894
895 final_pass = 0;
896 __split_whole_condition(expr);
897 final_pass = final_pass_orig;
898
899 return_ranges = alloc_sname("1");
900 sval.value = 1;
901 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_sval(sval));
902
903 return_id++;
904 FOR_EACH_PTR(returned_state_callbacks, cb) {
905 cb->callback(return_id, return_ranges, expr);
906 } END_FOR_EACH_PTR(cb);
907
908 __push_true_states();
909 __use_false_states();
910
911 return_ranges = alloc_sname("0");
912 sval.value = 0;
913 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_sval(sval));
914 return_id++;
915 FOR_EACH_PTR(returned_state_callbacks, cb) {
916 cb->callback(return_id, return_ranges, expr);
917 } END_FOR_EACH_PTR(cb);
918
919 __merge_true_states();
920 __free_fake_cur_stree();
921 }
922
923 static int split_helper(struct sm_state *sm, struct expression *expr)
924 {
925 struct returned_state_callback *cb;
926 struct range_list *rl;
927 char *return_ranges;
928 struct sm_state *tmp;
929 int ret = 0;
930 int nr_possible, nr_states;
931 char *compare_str;
932 char buf[128];
933 struct stree *orig_stree;
934 struct sm_state *orig_sm;
935
936 if (!sm || !sm->merged)
937 return 0;
938
939 if (too_many_possible(sm))
940 return 0;
941
942 /* bail if it gets too complicated */
943 nr_possible = ptr_list_size((struct ptr_list *)sm->possible);
944 nr_states = stree_count(__get_cur_stree());
945 /*
946 * the main thing option_info because we don't want to print a
947 * million lines of output. If someone else, like check_locking.c
948 * wants this data, then it doesn't cause a slow down to provide it.
949 */
950 if (option_info && nr_states * nr_possible >= 2000)
951 return 0;
952
953 compare_str = expr_lte_to_param(expr, -1);
954
955 orig_stree = clone_stree(__get_cur_stree());
956 FOR_EACH_PTR(sm->possible, tmp) {
957 if (tmp->merged)
958 continue;
959
960 ret = 1;
961 __push_fake_cur_stree();
962
963 nullify_path();
964 __unnullify_path();
965 FOR_EACH_SM(orig_stree, orig_sm) {
966 __set_sm_cur_stree(orig_sm);
967 } END_FOR_EACH_SM(orig_sm);
968
969 overwrite_states_using_pool(tmp);
970
971 rl = cast_rl(cur_func_return_type(), estate_rl(tmp->state));
972 return_ranges = show_rl(rl);
973 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(clone_rl(rl)));
974 if (compare_str) {
975 snprintf(buf, sizeof(buf), "%s%s", return_ranges, compare_str);
976 return_ranges = alloc_sname(buf);
977 }
978
979 return_id++;
980 FOR_EACH_PTR(returned_state_callbacks, cb) {
981 cb->callback(return_id, return_ranges, expr);
982 } END_FOR_EACH_PTR(cb);
983
984 __free_fake_cur_stree();
985 } END_FOR_EACH_PTR(tmp);
986
987 free_stree(&orig_stree);
988 return ret;
989 }
990
991 static const char *get_return_ranges_str(struct expression *expr, struct range_list **rl_p)
992 {
993 struct range_list *rl;
994 char *return_ranges;
995 sval_t sval;
996 char *compare_str;
997 char *math_str;
998 char buf[128];
999
1000 *rl_p = NULL;
1001
1002 if (!expr)
1003 return alloc_sname("");
1004
1005 if (get_implied_value(expr, &sval)) {
1006 *rl_p = alloc_rl(sval, sval);
1007 return sval_to_str(sval);
1008 }
1009
1010 compare_str = expr_equal_to_param(expr, -1);
1011 math_str = get_value_in_terms_of_parameter_math(expr);
1012
1013 if (get_implied_rl(expr, &rl)) {
1014 rl = cast_rl(cur_func_return_type(), rl);
1015 return_ranges = show_rl(rl);
1016 } else if (get_imaginary_absolute(expr, &rl)){
1017 rl = cast_rl(cur_func_return_type(), rl);
1018 return alloc_sname(show_rl(rl));
1019 } else {
1020 rl = cast_rl(cur_func_return_type(), alloc_whole_rl(get_type(expr)));
1021 return_ranges = show_rl(rl);
1022 }
1023 *rl_p = rl;
1024
1025 if (compare_str) {
1026 snprintf(buf, sizeof(buf), "%s%s", return_ranges, compare_str);
1027 return alloc_sname(buf);
1028 }
1029
1030 if (math_str) {
1031 snprintf(buf, sizeof(buf), "%s[%s]", return_ranges, math_str);
1032 return alloc_sname(buf);
1033 }
1034
1035 compare_str = expr_lte_to_param(expr, -1);
1036 if (compare_str) {
1037 snprintf(buf, sizeof(buf), "%s%s", return_ranges, compare_str);
1038 return alloc_sname(buf);
1039 }
1040 return return_ranges;
1041 }
1042
1043 static int split_positive_from_negative(struct expression *expr)
1044 {
1045 struct returned_state_callback *cb;
1046 struct range_list *rl;
1047 const char *return_ranges;
1048 struct range_list *ret_rl;
1049 int undo;
1050
1051 /* We're going to print the states 3 times */
1052 if (stree_count(__get_cur_stree()) > 10000 / 3)
1053 return 0;
1054
1055 if (!get_implied_rl(expr, &rl) || !rl)
1056 return 0;
1057 if (is_whole_rl(rl) || is_whole_rl_non_zero(rl))
1058 return 0;
1059 /* Forget about INT_MAX and larger */
1060 if (rl_max(rl).value <= 0)
1061 return 0;
1062 if (!sval_is_negative(rl_min(rl)))
1063 return 0;
1064
1065 if (!assume(compare_expression(expr, '>', zero_expr())))
1066 return 0;
1067
1068 return_id++;
1069 return_ranges = get_return_ranges_str(expr, &ret_rl);
1070 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));
1071 FOR_EACH_PTR(returned_state_callbacks, cb) {
1072 cb->callback(return_id, (char *)return_ranges, expr);
1073 } END_FOR_EACH_PTR(cb);
1074
1075 end_assume();
1076
1077 if (rl_has_sval(rl, sval_type_val(rl_type(rl), 0))) {
1078 undo = assume(compare_expression(expr, SPECIAL_EQUAL, zero_expr()));
1079
1080 return_id++;
1081 return_ranges = get_return_ranges_str(expr, &ret_rl);
1082 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));
1083 FOR_EACH_PTR(returned_state_callbacks, cb) {
1084 cb->callback(return_id, (char *)return_ranges, expr);
1085 } END_FOR_EACH_PTR(cb);
1086
1087 if (undo)
1088 end_assume();
1089 }
1090
1091 undo = assume(compare_expression(expr, '<', zero_expr()));
1092
1093 return_id++;
1094 return_ranges = get_return_ranges_str(expr, &ret_rl);
1095 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));
1096 FOR_EACH_PTR(returned_state_callbacks, cb) {
1097 cb->callback(return_id, (char *)return_ranges, expr);
1098 } END_FOR_EACH_PTR(cb);
1099
1100 if (undo)
1101 end_assume();
1102
1103 return 1;
1104 }
1105
1106 static int call_return_state_hooks_split_possible(struct expression *expr)
1107 {
1108 struct returned_state_callback *cb;
1109 struct range_list *rl;
1110 char *return_ranges;
1111 struct sm_state *sm;
1112 struct sm_state *tmp;
1113 int ret = 0;
1114 int nr_possible, nr_states;
1115 char *compare_str;
1116 char buf[128];
1117
1118 if (!expr || expr_equal_to_param(expr, -1))
1119 return 0;
1120
1121 sm = get_sm_state_expr(SMATCH_EXTRA, expr);
1122 if (!sm || !sm->merged)
1123 return 0;
1124
1125 if (too_many_possible(sm))
1126 return 0;
1127
1128 /* bail if it gets too complicated */
1129 nr_possible = ptr_list_size((struct ptr_list *)sm->possible);
1130 nr_states = stree_count(__get_cur_stree());
1131 /*
1132 * the main thing option_info because we don't want to print a
1133 * million lines of output. If someone else, like check_locking.c
1134 * wants this data, then it doesn't cause a slow down to provide it.
1135 */
1136 if (option_info && nr_states * nr_possible >= 2000)
1137 return 0;
1138
1139
1140 FOR_EACH_PTR(sm->possible, tmp) {
1141 if (tmp->merged)
1142 continue;
1143
1144 ret = 1;
1145 __push_fake_cur_stree();
1146
1147 overwrite_states_using_pool(tmp);
1148
1149 if (split_positive_from_negative(expr)) {
1150 __free_fake_cur_stree();
1151 continue;
1152 }
1153 rl = cast_rl(cur_func_return_type(), estate_rl(tmp->state));
1154 return_ranges = show_rl(rl);
1155 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(clone_rl(rl)));
1156
1157 compare_str = expr_lte_to_param(expr, -1);
1158 if (compare_str) {
1159 snprintf(buf, sizeof(buf), "%s%s", return_ranges, compare_str);
1160 return_ranges = alloc_sname(buf);
1161 }
1162
1163 return_id++;
1164 FOR_EACH_PTR(returned_state_callbacks, cb) {
1165 cb->callback(return_id, return_ranges, expr);
1166 } END_FOR_EACH_PTR(cb);
1167
1168 __free_fake_cur_stree();
1169 } END_FOR_EACH_PTR(tmp);
1170
1171 return ret;
1172 }
1173
1174 static int call_return_state_hooks_split_null_non_null(struct expression *expr)
1175 {
1176 struct returned_state_callback *cb;
1177 struct range_list *rl;
1178 struct range_list *nonnull_rl;
1179 sval_t null_sval;
1180 struct range_list *null_rl = NULL;
1181 char *return_ranges;
1182 struct smatch_state *state;
1183 int nr_states;
1184 int final_pass_orig = final_pass;
1185
1186 if (!expr || expr_equal_to_param(expr, -1))
1187 return 0;
1188 if (expr->type == EXPR_CALL)
1189 return 0;
1190 if (!is_pointer(expr))
1191 return 0;
1192
1193 state = get_state_expr(SMATCH_EXTRA, expr);
1194 if (!state || !estate_rl(state))
1195 return 0;
1196 if (estate_min(state).value == 0 && estate_max(state).value == 0)
1197 return 0;
1198 if (!rl_has_sval(estate_rl(state), sval_type_val(estate_type(state), 0)))
1199 return 0;
1200
1201 nr_states = stree_count(__get_cur_stree());
1202 if (option_info && nr_states >= 1500)
1203 return 0;
1204
1205 rl = estate_rl(state);
1206
1207 __push_fake_cur_stree();
1208
1209 final_pass = 0;
1210 __split_whole_condition(expr);
1211 final_pass = final_pass_orig;
1212
1213 nonnull_rl = rl_filter(rl, rl_zero());
1214 return_ranges = show_rl(nonnull_rl);
1215 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(nonnull_rl));
1216
1217 return_id++;
1218 FOR_EACH_PTR(returned_state_callbacks, cb) {
1219 cb->callback(return_id, return_ranges, expr);
1220 } END_FOR_EACH_PTR(cb);
1221
1222 __push_true_states();
1223 __use_false_states();
1224
1225 return_ranges = alloc_sname("0");
1226 null_sval = sval_type_val(rl_type(rl), 0);
1227 add_range(&null_rl, null_sval, null_sval);
1228 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(null_rl));
1229 return_id++;
1230 FOR_EACH_PTR(returned_state_callbacks, cb) {
1231 cb->callback(return_id, return_ranges, expr);
1232 } END_FOR_EACH_PTR(cb);
1233
1234 __merge_true_states();
1235 __free_fake_cur_stree();
1236
1237 return 1;
1238 }
1239
1240 static int call_return_state_hooks_split_success_fail(struct expression *expr)
1241 {
1242 struct range_list *rl;
1243 struct range_list *nonzero_rl;
1244 sval_t zero_sval;
1245 struct range_list *zero_rl = NULL;
1246 int nr_states;
1247 struct returned_state_callback *cb;
1248 char *return_ranges;
1249 int final_pass_orig = final_pass;
1250 sval_t val;
1251
1252 if (option_project != PROJ_KERNEL)
1253 return 0;
1254
1255 nr_states = stree_count(__get_cur_stree());
1256 if (nr_states > 1500)
1257 return 0;
1258
1259 if (get_value(expr, &val))
1260 return 0;
1261 if (!get_implied_rl(expr, &rl))
1262 return 0;
1263 if (rl_min(rl).value < -4095 || rl_min(rl).value >= 0)
1264 return 0;
1265 if (rl_max(rl).value != 0)
1266 return 0;
1267
1268 __push_fake_cur_stree();
1269
1270 final_pass = 0;
1271 __split_whole_condition(expr);
1272 final_pass = final_pass_orig;
1273
1274 nonzero_rl = rl_filter(rl, rl_zero());
1275 return_ranges = show_rl(nonzero_rl);
1276 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(nonzero_rl));
1277
1278 return_id++;
1279 FOR_EACH_PTR(returned_state_callbacks, cb) {
1280 cb->callback(return_id, return_ranges, expr);
1281 } END_FOR_EACH_PTR(cb);
1282
1283 __push_true_states();
1284 __use_false_states();
1285
1286 return_ranges = alloc_sname("0");
1287 zero_sval = sval_type_val(rl_type(rl), 0);
1288 add_range(&zero_rl, zero_sval, zero_sval);
1289 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(zero_rl));
1290 return_id++;
1291 FOR_EACH_PTR(returned_state_callbacks, cb) {
1292 cb->callback(return_id, return_ranges, expr);
1293 } END_FOR_EACH_PTR(cb);
1294
1295 __merge_true_states();
1296 __free_fake_cur_stree();
1297
1298 return 1;
1299 }
1300
1301 static int is_boolean(struct expression *expr)
1302 {
1303 struct range_list *rl;
1304
1305 if (!get_implied_rl(expr, &rl))
1306 return 0;
1307 if (rl_min(rl).value == 0 && rl_max(rl).value == 1)
1308 return 1;
1309 return 0;
1310 }
1311
1312 static int is_conditional(struct expression *expr)
1313 {
1314 if (!expr)
1315 return 0;
1316 if (expr->type == EXPR_CONDITIONAL || expr->type == EXPR_SELECT)
1317 return 1;
1318 return 0;
1319 }
1320
1321 static int splitable_function_call(struct expression *expr)
1322 {
1323 struct sm_state *sm;
1324 char buf[64];
1325
1326 if (!expr || expr->type != EXPR_CALL)
1327 return 0;
1328 snprintf(buf, sizeof(buf), "return %p", expr);
1329 sm = get_sm_state(SMATCH_EXTRA, buf, NULL);
1330 return split_helper(sm, expr);
1331 }
1332
1333 static void call_return_state_hooks(struct expression *expr)
1334 {
1335 struct returned_state_callback *cb;
1336 struct range_list *ret_rl;
1337 const char *return_ranges;
1338 int nr_states;
1339 sval_t sval;
1340
1341 if (__path_is_null())
1342 return;
1343
1344 expr = strip_expr(expr);
1345
1346 if (is_impossible_path())
1347 goto vanilla;
1348
1349 if (!get_implied_value(expr, &sval) &&
1350 (is_condition(expr) || is_boolean(expr))) {
1351 call_return_state_hooks_compare(expr);
1352 return;
1353 } else if (is_conditional(expr)) {
1354 call_return_state_hooks_conditional(expr);
1355 return;
1356 } else if (call_return_state_hooks_split_possible(expr)) {
1357 return;
1358 } else if (call_return_state_hooks_split_null_non_null(expr)) {
1359 return;
1360 } else if (call_return_state_hooks_split_success_fail(expr)) {
1361 return;
1362 } else if (splitable_function_call(expr)) {
1363 return;
1364 } else if (split_positive_from_negative(expr)) {
1365 return;
1366 }
1367
1368 vanilla:
1369 return_ranges = get_return_ranges_str(expr, &ret_rl);
1370 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));
1371
1372 return_id++;
1373 nr_states = stree_count(__get_cur_stree());
1374 if (nr_states >= 10000) {
1375 match_return_info(return_id, (char *)return_ranges, expr);
1376 return;
1377 }
1378 FOR_EACH_PTR(returned_state_callbacks, cb) {
1379 cb->callback(return_id, (char *)return_ranges, expr);
1380 } END_FOR_EACH_PTR(cb);
1381 }
1382
1383 static void print_returned_struct_members(int return_id, char *return_ranges, struct expression *expr)
1384 {
1385 struct returned_member_callback *cb;
1386 struct stree *stree;
1387 struct sm_state *sm;
1388 struct symbol *type;
1389 char *name;
1390 char member_name[256];
1391 int len;
1392
1393 type = get_type(expr);
1394 if (!type || type->type != SYM_PTR)
1395 return;
1396 name = expr_to_var(expr);
1397 if (!name)
1398 return;
1399
1400 member_name[sizeof(member_name) - 1] = '\0';
1401 strcpy(member_name, "$");
1402
1403 len = strlen(name);
1404 FOR_EACH_PTR(returned_member_callbacks, cb) {
1405 stree = __get_cur_stree();
1406 FOR_EACH_MY_SM(cb->owner, stree, sm) {
1407 if (sm->name[0] == '*' && strcmp(sm->name + 1, name) == 0) {
1408 strcpy(member_name, "*$");
1409 cb->callback(return_id, return_ranges, expr, member_name, sm->state);
1410 continue;
1411 }
1412 if (strncmp(sm->name, name, len) != 0)
1413 continue;
1414 if (strncmp(sm->name + len, "->", 2) != 0)
1415 continue;
1416 snprintf(member_name, sizeof(member_name), "$%s", sm->name + len);
1417 cb->callback(return_id, return_ranges, expr, member_name, sm->state);
1418 } END_FOR_EACH_SM(sm);
1419 } END_FOR_EACH_PTR(cb);
1420
1421 free_string(name);
1422 }
1423
1424 static void reset_memdb(struct symbol *sym)
1425 {
1426 mem_sql(NULL, NULL, "delete from caller_info;");
1427 mem_sql(NULL, NULL, "delete from return_states;");
1428 mem_sql(NULL, NULL, "delete from call_implies;");
1429 }
1430
1431 static void match_end_func_info(struct symbol *sym)
1432 {
1433 if (__path_is_null())
1434 return;
1435 call_return_state_hooks(NULL);
1436 }
1437
1438 static void match_after_func(struct symbol *sym)
1439 {
1440 if (!__inline_fn)
1441 reset_memdb(sym);
1442 }
1443
1444 static void init_memdb(void)
1445 {
1446 char *err = NULL;
1447 int rc;
1448 const char *schema_files[] = {
1449 "db/db.schema",
1450 "db/caller_info.schema",
1451 "db/return_states.schema",
1452 "db/function_type_size.schema",
1453 "db/type_size.schema",
1454 "db/call_implies.schema",
1455 "db/function_ptr.schema",
1456 "db/local_values.schema",
1457 "db/function_type_value.schema",
1458 "db/type_value.schema",
1459 "db/function_type_info.schema",
1460 "db/data_info.schema",
1461 };
1462 static char buf[4096];
1463 int fd;
1464 int ret;
1465 int i;
1466
1467 rc = sqlite3_open(":memory:", &mem_db);
1468 if (rc != SQLITE_OK) {
1469 printf("Error starting In-Memory database.");
1470 return;
1471 }
1472
1473 for (i = 0; i < ARRAY_SIZE(schema_files); i++) {
1474 fd = open_data_file(schema_files[i]);
1475 if (fd < 0) {
1476 mem_db = NULL;
1477 return;
1478 }
1479 ret = read(fd, buf, sizeof(buf));
1480 if (ret == sizeof(buf)) {
1481 printf("Schema file too large: %s (limit %zd bytes)",
1482 schema_files[i], sizeof(buf));
1483 }
1484 buf[ret] = '\0';
1485 rc = sqlite3_exec(mem_db, buf, NULL, 0, &err);
1486 if (rc != SQLITE_OK) {
1487 fprintf(stderr, "SQL error #2: %s\n", err);
1488 fprintf(stderr, "%s\n", buf);
1489 }
1490 }
1491 }
1492
1493 void open_smatch_db(void)
1494 {
1495 int rc;
1496
1497 if (option_no_db)
1498 return;
1499
1500 init_memdb();
1501
1502 rc = sqlite3_open_v2("smatch_db.sqlite", &db, SQLITE_OPEN_READONLY, NULL);
1503 if (rc != SQLITE_OK) {
1504 option_no_db = 1;
1505 return;
1506 }
1507 return;
1508 }
1509
1510 static void register_common_funcs(void)
1511 {
1512 struct token *token;
1513 char *func;
1514 char filename[256];
1515
1516 if (option_project == PROJ_NONE)
1517 strcpy(filename, "common_functions");
1518 else
1519 snprintf(filename, 256, "%s.common_functions", option_project_str);
1520
1521 token = get_tokens_file(filename);
1522 if (!token)
1523 return;
1524 if (token_type(token) != TOKEN_STREAMBEGIN)
1525 return;
1526 token = token->next;
1527 while (token_type(token) != TOKEN_STREAMEND) {
1528 if (token_type(token) != TOKEN_IDENT)
1529 return;
1530 func = alloc_string(show_ident(token->ident));
1531 add_ptr_list(&common_funcs, func);
1532 token = token->next;
1533 }
1534 clear_token_alloc();
1535 }
1536
1537
1538 void register_definition_db_callbacks(int id)
1539 {
1540 add_hook(&match_call_info, FUNCTION_CALL_HOOK);
1541 add_hook(&global_variable, BASE_HOOK);
1542 add_hook(&global_variable, DECLARATION_HOOK);
1543 add_split_return_callback(match_return_info);
1544 add_split_return_callback(print_returned_struct_members);
1545 add_hook(&call_return_state_hooks, RETURN_HOOK);
1546 add_hook(&match_end_func_info, END_FUNC_HOOK);
1547 add_hook(&match_after_func, AFTER_FUNC_HOOK);
1548
1549 add_hook(&match_data_from_db, FUNC_DEF_HOOK);
1550 add_hook(&match_call_implies, CALL_HOOK_AFTER_INLINE);
1551
1552 register_common_funcs();
1553 }
1554
1555 void register_db_call_marker(int id)
1556 {
1557 add_hook(&match_call_marker, FUNCTION_CALL_HOOK);
1558 }
1559
1560 char *return_state_to_var_sym(struct expression *expr, int param, const char *key, struct symbol **sym)
1561 {
1562 struct expression *arg;
1563 char *name = NULL;
1564 char member_name[256];
1565
1566 *sym = NULL;
1567
1568 if (param == -1) {
1569 const char *star = "";
1570
1571 if (expr->type != EXPR_ASSIGNMENT)
1572 return NULL;
1573 name = expr_to_var_sym(expr->left, sym);
1574 if (!name)
1575 return NULL;
1576 if (key[0] == '*') {
1577 star = "*";
1578 key++;
1579 }
1580 if (strncmp(key, "$", 1) != 0)
1581 return name;
1582 snprintf(member_name, sizeof(member_name), "%s%s%s", star, name, key + 1);
1583 free_string(name);
1584 return alloc_string(member_name);
1585 }
1586
1587 while (expr->type == EXPR_ASSIGNMENT)
1588 expr = strip_expr(expr->right);
1589 if (expr->type != EXPR_CALL)
1590 return NULL;
1591
1592 arg = get_argument_from_call_expr(expr->args, param);
1593 if (!arg)
1594 return NULL;
1595
1596 return get_variable_from_key(arg, key, sym);
1597 }
1598
1599 char *get_variable_from_key(struct expression *arg, const char *key, struct symbol **sym)
1600 {
1601 char buf[256];
1602 char *tmp;
1603
1604 if (!arg)
1605 return NULL;
1606
1607 arg = strip_expr(arg);
1608
1609 if (strcmp(key, "$") == 0)
1610 return expr_to_var_sym(arg, sym);
1611
1612 if (strcmp(key, "*$") == 0) {
1613 if (arg->type == EXPR_PREOP && arg->op == '&') {
1614 arg = strip_expr(arg->unop);
1615 return expr_to_var_sym(arg, sym);
1616 } else {
1617 tmp = expr_to_var_sym(arg, sym);
1618 if (!tmp)
1619 return NULL;
1620 snprintf(buf, sizeof(buf), "*%s", tmp);
1621 free_string(tmp);
1622 return alloc_string(buf);
1623 }
1624 }
1625
1626 if (arg->type == EXPR_PREOP && arg->op == '&') {
1627 arg = strip_expr(arg->unop);
1628 tmp = expr_to_var_sym(arg, sym);
1629 if (!tmp)
1630 return NULL;
1631 snprintf(buf, sizeof(buf), "%s.%s", tmp, key + 3);
1632 return alloc_string(buf);
1633 }
1634
1635 tmp = expr_to_var_sym(arg, sym);
1636 if (!tmp)
1637 return NULL;
1638 snprintf(buf, sizeof(buf), "%s%s", tmp, key + 1);
1639 free_string(tmp);
1640 return alloc_string(buf);
1641 }
1642
1643 char *get_chunk_from_key(struct expression *arg, char *key, struct symbol **sym, struct var_sym_list **vsl)
1644 {
1645 *vsl = NULL;
1646
1647 if (strcmp("$", key) == 0)
1648 return expr_to_chunk_sym_vsl(arg, sym, vsl);
1649 return get_variable_from_key(arg, key, sym);
1650 }
1651
1652 const char *get_param_name_var_sym(const char *name, struct symbol *sym)
1653 {
1654 char *param_name;
1655 int name_len;
1656 static char buf[256];
1657
1658 if (!sym || !sym->ident)
1659 return NULL;
1660
1661 param_name = sym->ident->name;
1662 name_len = strlen(param_name);
1663
1664 if (strcmp(name, param_name) == 0) {
1665 return "$";
1666 } else if (name[name_len] == '-' && /* check for '-' from "->" */
1667 strncmp(name, param_name, name_len) == 0) {
1668 snprintf(buf, sizeof(buf), "$%s", name + name_len);
1669 return buf;
1670 } else if (name[0] == '*' && strcmp(name + 1, param_name) == 0) {
1671 return "*$";
1672 }
1673 return NULL;
1674 }
1675
1676 const char *get_param_name(struct sm_state *sm)
1677 {
1678 return get_param_name_var_sym(sm->name, sm->sym);
1679 }
1680
1681 char *get_data_info_name(struct expression *expr)
1682 {
1683 struct symbol *sym;
1684 char *name;
1685 char buf[256];
1686 char *ret = NULL;
1687
1688 expr = strip_expr(expr);
1689 name = get_member_name(expr);
1690 if (name)
1691 return name;
1692 name = expr_to_var_sym(expr, &sym);
1693 if (!name || !sym)
1694 goto free;
1695 if (!(sym->ctype.modifiers & MOD_TOPLEVEL))
1696 goto free;
1697 if (sym->ctype.modifiers & MOD_STATIC)
1698 snprintf(buf, sizeof(buf), "static %s", name);
1699 else
1700 snprintf(buf, sizeof(buf), "global %s", name);
1701 ret = alloc_sname(buf);
1702 free:
1703 free_string(name);
1704 return ret;
1705 }
Static analysis for C