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db: use "extern" instead of the file name for globals in data_info
[smatch.git] / smatch_db.c
blob28d2c3f83f772f9f3f10e94cc1e7eed9661c4161
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, NULL, &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 && !parse_error) {
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'",
262 is_static(data) ? get_base_file() : "extern",
263 data_name, type, value);
264 }
265
266 char *get_static_filter(struct symbol *sym)
267 {
268 static char sql_filter[1024];
269
270 /* This can only happen on buggy code. Return invalid SQL. */
271 if (!sym) {
272 sql_filter[0] = '\0';
273 return sql_filter;
274 }
275
276 if (sym->ctype.modifiers & MOD_STATIC) {
277 snprintf(sql_filter, sizeof(sql_filter),
278 "file = '%s' and function = '%s' and static = '1'",
279 get_base_file(), sym->ident->name);
280 } else {
281 snprintf(sql_filter, sizeof(sql_filter),
282 "function = '%s' and static = '0'", sym->ident->name);
283 }
284
285 return sql_filter;
286 }
287
288 static int get_row_count(void *_row_count, int argc, char **argv, char **azColName)
289 {
290 int *row_count = _row_count;
291
292 *row_count = 0;
293 if (argc != 1)
294 return 0;
295 *row_count = atoi(argv[0]);
296 return 0;
297 }
298
299 static void sql_select_return_states_pointer(const char *cols,
300 struct expression *call, int (*callback)(void*, int, char**, char**), void *info)
301 {
302 char *ptr;
303 int return_count;
304
305 ptr = get_fnptr_name(call->fn);
306 if (!ptr)
307 return;
308
309 run_sql(get_row_count, &return_count,
310 "select count(*) from return_states join function_ptr "
311 "where return_states.function == function_ptr.function and "
312 "ptr = '%s' and searchable = 1 and type = %d;", ptr, INTERNAL);
313 /* The magic number 100 is just from testing on the kernel. */
314 if (return_count > 100)
315 return;
316
317 run_sql(callback, info,
318 "select %s from return_states join function_ptr where "
319 "return_states.function == function_ptr.function and ptr = '%s' "
320 "and searchable = 1 "
321 "order by function_ptr.file, return_states.file, return_id, type;",
322 cols, ptr);
323 }
324
325 static int is_local_symbol(struct expression *expr)
326 {
327 if (expr->type != EXPR_SYMBOL)
328 return 0;
329 if (expr->symbol->ctype.modifiers & (MOD_NONLOCAL | MOD_STATIC | MOD_ADDRESSABLE))
330 return 0;
331 return 1;
332 }
333
334 void sql_select_return_states(const char *cols, struct expression *call,
335 int (*callback)(void*, int, char**, char**), void *info)
336 {
337 int row_count;
338
339 if (is_fake_call(call))
340 return;
341
342 if (call->fn->type != EXPR_SYMBOL || !call->fn->symbol || is_local_symbol(call->fn)) {
343 sql_select_return_states_pointer(cols, call, callback, info);
344 return;
345 }
346
347 if (inlinable(call->fn)) {
348 mem_sql(callback, info,
349 "select %s from return_states where call_id = '%lu' order by return_id, type;",
350 cols, (unsigned long)call);
351 return;
352 }
353
354 run_sql(get_row_count, &row_count, "select count(*) from return_states where %s;",
355 get_static_filter(call->fn->symbol));
356 if (row_count > 3000)
357 return;
358
359 run_sql(callback, info, "select %s from return_states where %s order by file, return_id, type;",
360 cols, get_static_filter(call->fn->symbol));
361 }
362
363 void sql_select_call_implies(const char *cols, struct expression *call,
364 int (*callback)(void*, int, char**, char**))
365 {
366 if (call->fn->type != EXPR_SYMBOL || !call->fn->symbol)
367 return;
368
369 if (inlinable(call->fn)) {
370 mem_sql(callback, call,
371 "select %s from call_implies where call_id = '%lu';",
372 cols, (unsigned long)call);
373 return;
374 }
375
376 run_sql(callback, call, "select %s from call_implies where %s;",
377 cols, get_static_filter(call->fn->symbol));
378 }
379
380 void sql_select_caller_info(const char *cols, struct symbol *sym,
381 int (*callback)(void*, int, char**, char**))
382 {
383 if (__inline_fn) {
384 mem_sql(callback, NULL,
385 "select %s from caller_info where call_id = %lu;",
386 cols, (unsigned long)__inline_fn);
387 return;
388 }
389
390 run_sql(callback, NULL,
391 "select %s from caller_info where %s order by call_id;",
392 cols, get_static_filter(sym));
393 }
394
395 void select_caller_info_hook(void (*callback)(const char *name, struct symbol *sym, char *key, char *value), int type)
396 {
397 struct def_callback *def_callback = __alloc_def_callback(0);
398
399 def_callback->hook_type = type;
400 def_callback->callback = callback;
401 add_ptr_list(&callbacks, def_callback);
402 }
403
404 /*
405 * These call backs are used when the --info option is turned on to print struct
406 * member information. For example foo->bar could have a state in
407 * smatch_extra.c and also check_user.c.
408 */
409 void add_member_info_callback(int owner, void (*callback)(struct expression *call, int param, char *printed_name, struct sm_state *sm))
410 {
411 struct member_info_callback *member_callback = __alloc_member_info_callback(0);
412
413 member_callback->owner = owner;
414 member_callback->callback = callback;
415 add_ptr_list(&member_callbacks, member_callback);
416 }
417
418 void add_split_return_callback(void (*fn)(int return_id, char *return_ranges, struct expression *returned_expr))
419 {
420 struct returned_state_callback *callback = __alloc_returned_state_callback(0);
421
422 callback->callback = fn;
423 add_ptr_list(&returned_state_callbacks, callback);
424 }
425
426 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))
427 {
428 struct returned_member_callback *member_callback = __alloc_returned_member_callback(0);
429
430 member_callback->owner = owner;
431 member_callback->callback = callback;
432 add_ptr_list(&returned_member_callbacks, member_callback);
433 }
434
435 void select_call_implies_hook(int type, void (*callback)(struct expression *arg, char *key, char *value))
436 {
437 struct call_implies_callback *cb = __alloc_call_implies_callback(0);
438
439 cb->type = type;
440 cb->callback = callback;
441 add_ptr_list(&call_implies_cb_list, cb);
442 }
443
444 struct return_info {
445 struct expression *static_returns_call;
446 struct symbol *return_type;
447 struct range_list *return_range_list;
448 };
449
450 static int db_return_callback(void *_ret_info, int argc, char **argv, char **azColName)
451 {
452 struct return_info *ret_info = _ret_info;
453 struct range_list *rl;
454 struct expression *call_expr = ret_info->static_returns_call;
455
456 if (argc != 1)
457 return 0;
458 call_results_to_rl(call_expr, ret_info->return_type, argv[0], &rl);
459 ret_info->return_range_list = rl_union(ret_info->return_range_list, rl);
460 return 0;
461 }
462
463 struct range_list *db_return_vals(struct expression *expr)
464 {
465 struct return_info ret_info = {};
466 char buf[64];
467 struct sm_state *sm;
468
469 if (is_fake_call(expr))
470 return NULL;
471
472 snprintf(buf, sizeof(buf), "return %p", expr);
473 sm = get_sm_state(SMATCH_EXTRA, buf, NULL);
474 if (sm)
475 return clone_rl(estate_rl(sm->state));
476 ret_info.static_returns_call = expr;
477 ret_info.return_type = get_type(expr);
478 if (!ret_info.return_type)
479 return NULL;
480
481 if (expr->fn->type != EXPR_SYMBOL || !expr->fn->symbol)
482 return NULL;
483
484 ret_info.return_range_list = NULL;
485 if (inlinable(expr->fn)) {
486 mem_sql(db_return_callback, &ret_info,
487 "select distinct return from return_states where call_id = '%lu';",
488 (unsigned long)expr);
489 } else {
490 run_sql(db_return_callback, &ret_info,
491 "select distinct return from return_states where %s;",
492 get_static_filter(expr->fn->symbol));
493 }
494 return ret_info.return_range_list;
495 }
496
497 struct range_list *db_return_vals_from_str(const char *fn_name)
498 {
499 struct return_info ret_info;
500
501 ret_info.static_returns_call = NULL;
502 ret_info.return_type = &llong_ctype;
503 ret_info.return_range_list = NULL;
504
505 run_sql(db_return_callback, &ret_info,
506 "select distinct return from return_states where function = '%s';",
507 fn_name);
508 return ret_info.return_range_list;
509 }
510
511 static void match_call_marker(struct expression *expr)
512 {
513 /*
514 * we just want to record something in the database so that if we have
515 * two calls like: frob(4); frob(some_unkown); then on the receiving
516 * side we know that sometimes frob is called with unknown parameters.
517 */
518
519 sql_insert_caller_info(expr, INTERNAL, -1, "%call_marker%", "");
520 }
521
522 static void print_struct_members(struct expression *call, struct expression *expr, int param, struct stree *stree,
523 void (*callback)(struct expression *call, int param, char *printed_name, struct sm_state *sm))
524 {
525 struct sm_state *sm;
526 char *name;
527 struct symbol *sym;
528 int len;
529 char printed_name[256];
530 int is_address = 0;
531
532 expr = strip_expr(expr);
533 if (expr->type == EXPR_PREOP && expr->op == '&') {
534 expr = strip_expr(expr->unop);
535 is_address = 1;
536 }
537
538 name = expr_to_var_sym(expr, &sym);
539 if (!name || !sym)
540 goto free;
541
542 len = strlen(name);
543 FOR_EACH_SM(stree, sm) {
544 if (sm->sym != sym)
545 continue;
546 if (strcmp(name, sm->name) == 0) {
547 if (is_address)
548 snprintf(printed_name, sizeof(printed_name), "*$");
549 else /* these are already handled. fixme: handle them here */
550 continue;
551 } else if (sm->name[0] == '*' && strcmp(name, sm->name + 1) == 0) {
552 snprintf(printed_name, sizeof(printed_name), "*$");
553 } else if (strncmp(name, sm->name, len) == 0) {
554 if (isalnum(sm->name[len]))
555 continue;
556 if (is_address)
557 snprintf(printed_name, sizeof(printed_name), "$->%s", sm->name + len + 1);
558 else
559 snprintf(printed_name, sizeof(printed_name), "$%s", sm->name + len);
560 } else {
561 continue;
562 }
563 callback(call, param, printed_name, sm);
564 } END_FOR_EACH_SM(sm);
565 free:
566 free_string(name);
567 }
568
569 static void match_call_info(struct expression *call)
570 {
571 struct member_info_callback *cb;
572 struct expression *arg;
573 struct stree *stree;
574 char *name;
575 int i;
576
577 name = get_fnptr_name(call->fn);
578 if (!name)
579 return;
580
581 FOR_EACH_PTR(member_callbacks, cb) {
582 stree = get_all_states_stree(cb->owner);
583 i = 0;
584 FOR_EACH_PTR(call->args, arg) {
585 print_struct_members(call, arg, i, stree, cb->callback);
586 i++;
587 } END_FOR_EACH_PTR(arg);
588 free_stree(&stree);
589 } END_FOR_EACH_PTR(cb);
590
591 free_string(name);
592 }
593
594 static int get_param(int param, char **name, struct symbol **sym)
595 {
596 struct symbol *arg;
597 int i;
598
599 i = 0;
600 FOR_EACH_PTR(cur_func_sym->ctype.base_type->arguments, arg) {
601 /*
602 * this is a temporary hack to work around a bug (I think in sparse?)
603 * 2.6.37-rc1:fs/reiserfs/journal.o
604 * If there is a function definition without parameter name found
605 * after a function implementation then it causes a crash.
606 * int foo() {}
607 * int bar(char *);
608 */
609 if (arg->ident->name < (char *)100)
610 continue;
611 if (i == param) {
612 *name = arg->ident->name;
613 *sym = arg;
614 return TRUE;
615 }
616 i++;
617 } END_FOR_EACH_PTR(arg);
618
619 return FALSE;
620 }
621
622 static struct stree *final_states;
623 static int prev_func_id = -1;
624 static int caller_info_callback(void *unused, int argc, char **argv, char **azColName)
625 {
626 int func_id;
627 long type;
628 long param;
629 char *key;
630 char *value;
631 char *name = NULL;
632 struct symbol *sym = NULL;
633 struct def_callback *def_callback;
634 struct stree *stree;
635
636 if (argc != 5)
637 return 0;
638
639 func_id = atoi(argv[0]);
640 errno = 0;
641 type = strtol(argv[1], NULL, 10);
642 param = strtol(argv[2], NULL, 10);
643 if (errno)
644 return 0;
645 key = argv[3];
646 value = argv[4];
647
648
649 if (prev_func_id == -1)
650 prev_func_id = func_id;
651 if (func_id != prev_func_id) {
652 stree = __pop_fake_cur_stree();
653 merge_stree(&final_states, stree);
654 free_stree(&stree);
655 __push_fake_cur_stree();
656 __unnullify_path();
657 prev_func_id = func_id;
658 }
659
660 if (param >= 0 && !get_param(param, &name, &sym))
661 return 0;
662
663 FOR_EACH_PTR(callbacks, def_callback) {
664 if (def_callback->hook_type == type)
665 def_callback->callback(name, sym, key, value);
666 } END_FOR_EACH_PTR(def_callback);
667
668 return 0;
669 }
670
671 static void get_direct_callers(struct symbol *sym)
672 {
673 sql_select_caller_info("call_id, type, parameter, key, value", sym,
674 caller_info_callback);
675 }
676
677 static struct string_list *ptr_names_done;
678 static struct string_list *ptr_names;
679
680 static int get_ptr_name(void *unused, int argc, char **argv, char **azColName)
681 {
682 insert_string(&ptr_names, alloc_string(argv[0]));
683 return 0;
684 }
685
686 static char *get_next_ptr_name(void)
687 {
688 char *ptr;
689
690 FOR_EACH_PTR(ptr_names, ptr) {
691 if (list_has_string(ptr_names_done, ptr))
692 continue;
693 insert_string(&ptr_names_done, ptr);
694 return ptr;
695 } END_FOR_EACH_PTR(ptr);
696 return NULL;
697 }
698
699 static void get_ptr_names(const char *file, const char *name)
700 {
701 char sql_filter[1024];
702 int before, after;
703
704 if (file) {
705 snprintf(sql_filter, 1024, "file = '%s' and function = '%s';",
706 file, name);
707 } else {
708 snprintf(sql_filter, 1024, "function = '%s';", name);
709 }
710
711 before = ptr_list_size((struct ptr_list *)ptr_names);
712
713 run_sql(get_ptr_name, NULL,
714 "select distinct ptr from function_ptr where %s",
715 sql_filter);
716
717 after = ptr_list_size((struct ptr_list *)ptr_names);
718 if (before == after)
719 return;
720
721 while ((name = get_next_ptr_name()))
722 get_ptr_names(NULL, name);
723 }
724
725 static void match_data_from_db(struct symbol *sym)
726 {
727 struct sm_state *sm;
728 struct stree *stree;
729
730 if (!sym || !sym->ident)
731 return;
732
733 __push_fake_cur_stree();
734 __unnullify_path();
735 prev_func_id = -1;
736
737 if (!__inline_fn) {
738 char *ptr;
739
740 if (sym->ctype.modifiers & MOD_STATIC)
741 get_ptr_names(get_base_file(), sym->ident->name);
742 else
743 get_ptr_names(NULL, sym->ident->name);
744
745 if (ptr_list_size((struct ptr_list *)ptr_names) > 20) {
746 __free_ptr_list((struct ptr_list **)&ptr_names);
747 __free_ptr_list((struct ptr_list **)&ptr_names_done);
748 stree = __pop_fake_cur_stree();
749 free_stree(&stree);
750 return;
751 }
752
753 get_direct_callers(sym);
754
755 FOR_EACH_PTR(ptr_names, ptr) {
756 run_sql(caller_info_callback, NULL,
757 "select call_id, type, parameter, key, value"
758 " from caller_info where function = '%s' order by call_id",
759 ptr);
760 free_string(ptr);
761 } END_FOR_EACH_PTR(ptr);
762
763 __free_ptr_list((struct ptr_list **)&ptr_names);
764 __free_ptr_list((struct ptr_list **)&ptr_names_done);
765 } else {
766 get_direct_callers(sym);
767 }
768
769 stree = __pop_fake_cur_stree();
770 merge_stree(&final_states, stree);
771 free_stree(&stree);
772
773 FOR_EACH_SM(final_states, sm) {
774 __set_sm(sm);
775 } END_FOR_EACH_SM(sm);
776
777 free_stree(&final_states);
778 }
779
780 static int call_implies_callbacks(void *_call, int argc, char **argv, char **azColName)
781 {
782 struct expression *call_expr = _call;
783 struct call_implies_callback *cb;
784 struct expression *arg = NULL;
785 int type;
786 int param;
787
788 if (argc != 5)
789 return 0;
790
791 type = atoi(argv[1]);
792 param = atoi(argv[2]);
793
794 FOR_EACH_PTR(call_implies_cb_list, cb) {
795 if (cb->type != type)
796 continue;
797 if (param != -1) {
798 arg = get_argument_from_call_expr(call_expr->args, param);
799 if (!arg)
800 continue;
801 }
802 cb->callback(arg, argv[3], argv[4]);
803 } END_FOR_EACH_PTR(cb);
804
805 return 0;
806 }
807
808 static void match_call_implies(struct expression *expr)
809 {
810 sql_select_call_implies("function, type, parameter, key, value", expr,
811 call_implies_callbacks);
812 }
813
814 static void print_initializer_list(struct expression_list *expr_list,
815 struct symbol *struct_type)
816 {
817 struct expression *expr;
818 struct symbol *base_type;
819 char struct_name[256];
820
821 FOR_EACH_PTR(expr_list, expr) {
822 if (expr->type == EXPR_INDEX && expr->idx_expression && expr->idx_expression->type == EXPR_INITIALIZER) {
823 print_initializer_list(expr->idx_expression->expr_list, struct_type);
824 continue;
825 }
826 if (expr->type != EXPR_IDENTIFIER)
827 continue;
828 if (!expr->expr_ident)
829 continue;
830 if (!expr->ident_expression || !expr->ident_expression->symbol_name)
831 continue;
832 base_type = get_type(expr->ident_expression);
833 if (!base_type || base_type->type != SYM_FN)
834 continue;
835 snprintf(struct_name, sizeof(struct_name), "(struct %s)->%s",
836 struct_type->ident->name, expr->expr_ident->name);
837 sql_insert_function_ptr(expr->ident_expression->symbol_name->name,
838 struct_name);
839 } END_FOR_EACH_PTR(expr);
840 }
841
842 static void global_variable(struct symbol *sym)
843 {
844 struct symbol *struct_type;
845
846 if (!sym->ident)
847 return;
848 if (!sym->initializer || sym->initializer->type != EXPR_INITIALIZER)
849 return;
850 struct_type = get_base_type(sym);
851 if (!struct_type)
852 return;
853 if (struct_type->type == SYM_ARRAY) {
854 struct_type = get_base_type(struct_type);
855 if (!struct_type)
856 return;
857 }
858 if (struct_type->type != SYM_STRUCT || !struct_type->ident)
859 return;
860 print_initializer_list(sym->initializer->expr_list, struct_type);
861 }
862
863 static void match_return_info(int return_id, char *return_ranges, struct expression *expr)
864 {
865 sql_insert_return_states(return_id, return_ranges, INTERNAL, -1, "", "");
866 }
867
868 static void call_return_state_hooks_conditional(struct expression *expr)
869 {
870 struct returned_state_callback *cb;
871 struct range_list *rl;
872 char *return_ranges;
873 int final_pass_orig = final_pass;
874
875 __push_fake_cur_stree();
876
877 final_pass = 0;
878 __split_whole_condition(expr->conditional);
879 final_pass = final_pass_orig;
880
881 if (get_implied_rl(expr->cond_true, &rl))
882 rl = cast_rl(cur_func_return_type(), rl);
883 else
884 rl = cast_rl(cur_func_return_type(), alloc_whole_rl(get_type(expr->cond_true)));
885 return_ranges = show_rl(rl);
886 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(rl));
887
888 return_id++;
889 FOR_EACH_PTR(returned_state_callbacks, cb) {
890 cb->callback(return_id, return_ranges, expr);
891 } END_FOR_EACH_PTR(cb);
892
893 __push_true_states();
894 __use_false_states();
895
896 if (get_implied_rl(expr->cond_false, &rl))
897 rl = cast_rl(cur_func_return_type(), rl);
898 else
899 rl = cast_rl(cur_func_return_type(), alloc_whole_rl(get_type(expr->cond_false)));
900 return_ranges = show_rl(rl);
901 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(rl));
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 __merge_true_states();
909 __free_fake_cur_stree();
910 }
911
912 static void call_return_state_hooks_compare(struct expression *expr)
913 {
914 struct returned_state_callback *cb;
915 char *return_ranges;
916 int final_pass_orig = final_pass;
917 sval_t sval = { .type = &int_ctype };
918 sval_t ret;
919
920 if (!get_implied_value(expr, &ret))
921 ret.value = -1;
922
923 __push_fake_cur_stree();
924
925 final_pass = 0;
926 __split_whole_condition(expr);
927 final_pass = final_pass_orig;
928
929 if (ret.value != 0) {
930 return_ranges = alloc_sname("1");
931 sval.value = 1;
932 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_sval(sval));
933
934 return_id++;
935 FOR_EACH_PTR(returned_state_callbacks, cb) {
936 cb->callback(return_id, return_ranges, expr);
937 } END_FOR_EACH_PTR(cb);
938 }
939
940 __push_true_states();
941 __use_false_states();
942
943 if (ret.value != 1) {
944 return_ranges = alloc_sname("0");
945 sval.value = 0;
946 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_sval(sval));
947
948 return_id++;
949 FOR_EACH_PTR(returned_state_callbacks, cb) {
950 cb->callback(return_id, return_ranges, expr);
951 } END_FOR_EACH_PTR(cb);
952 }
953
954 __merge_true_states();
955 __free_fake_cur_stree();
956 }
957
958 static int ptr_in_list(struct sm_state *sm, struct state_list *slist)
959 {
960 struct sm_state *tmp;
961
962 FOR_EACH_PTR(slist, tmp) {
963 if (strcmp(tmp->state->name, sm->state->name) == 0)
964 return 1;
965 } END_FOR_EACH_PTR(tmp);
966
967 return 0;
968 }
969
970 static int split_possible_helper(struct sm_state *sm, struct expression *expr)
971 {
972 struct returned_state_callback *cb;
973 struct range_list *rl;
974 char *return_ranges;
975 struct sm_state *tmp;
976 int ret = 0;
977 int nr_possible, nr_states;
978 char *compare_str = NULL;
979 char buf[128];
980 struct state_list *already_handled = NULL;
981
982 if (!sm || !sm->merged)
983 return 0;
984
985 if (too_many_possible(sm))
986 return 0;
987
988 /* bail if it gets too complicated */
989 nr_possible = ptr_list_size((struct ptr_list *)sm->possible);
990 nr_states = stree_count(__get_cur_stree());
991 if (option_info && nr_states * nr_possible >= 2000)
992 return 0;
993
994 FOR_EACH_PTR(sm->possible, tmp) {
995 if (tmp->merged)
996 continue;
997 if (ptr_in_list(tmp, already_handled))
998 continue;
999 add_ptr_list(&already_handled, tmp);
1000
1001 ret = 1;
1002 __push_fake_cur_stree();
1003
1004 overwrite_states_using_pool(sm, tmp);
1005
1006 rl = cast_rl(cur_func_return_type(), estate_rl(tmp->state));
1007 return_ranges = show_rl(rl);
1008 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(clone_rl(rl)));
1009 compare_str = expr_lte_to_param(expr, -1);
1010 if (compare_str) {
1011 snprintf(buf, sizeof(buf), "%s%s", return_ranges, compare_str);
1012 return_ranges = alloc_sname(buf);
1013 }
1014
1015 return_id++;
1016 FOR_EACH_PTR(returned_state_callbacks, cb) {
1017 cb->callback(return_id, return_ranges, expr);
1018 } END_FOR_EACH_PTR(cb);
1019
1020 __free_fake_cur_stree();
1021 } END_FOR_EACH_PTR(tmp);
1022
1023 free_slist(&already_handled);
1024
1025 return ret;
1026 }
1027
1028 static int call_return_state_hooks_split_possible(struct expression *expr)
1029 {
1030 struct sm_state *sm;
1031
1032 if (!expr || expr_equal_to_param(expr, -1))
1033 return 0;
1034
1035 sm = get_sm_state_expr(SMATCH_EXTRA, expr);
1036 return split_possible_helper(sm, expr);
1037 }
1038
1039 static const char *get_return_ranges_str(struct expression *expr, struct range_list **rl_p)
1040 {
1041 struct range_list *rl;
1042 char *return_ranges;
1043 sval_t sval;
1044 char *compare_str;
1045 char *math_str;
1046 char buf[128];
1047
1048 *rl_p = NULL;
1049
1050 if (!expr)
1051 return alloc_sname("");
1052
1053 if (get_implied_value(expr, &sval)) {
1054 *rl_p = alloc_rl(sval, sval);
1055 return sval_to_str(sval);
1056 }
1057
1058 compare_str = expr_equal_to_param(expr, -1);
1059 math_str = get_value_in_terms_of_parameter_math(expr);
1060
1061 if (get_implied_rl(expr, &rl)) {
1062 rl = cast_rl(cur_func_return_type(), rl);
1063 return_ranges = show_rl(rl);
1064 } else if (get_imaginary_absolute(expr, &rl)){
1065 rl = cast_rl(cur_func_return_type(), rl);
1066 return alloc_sname(show_rl(rl));
1067 } else {
1068 rl = cast_rl(cur_func_return_type(), alloc_whole_rl(get_type(expr)));
1069 return_ranges = show_rl(rl);
1070 }
1071 *rl_p = rl;
1072
1073 if (compare_str) {
1074 snprintf(buf, sizeof(buf), "%s%s", return_ranges, compare_str);
1075 return alloc_sname(buf);
1076 }
1077
1078 if (math_str) {
1079 snprintf(buf, sizeof(buf), "%s[%s]", return_ranges, math_str);
1080 return alloc_sname(buf);
1081 }
1082
1083 compare_str = expr_lte_to_param(expr, -1);
1084 if (compare_str) {
1085 snprintf(buf, sizeof(buf), "%s%s", return_ranges, compare_str);
1086 return alloc_sname(buf);
1087 }
1088 return return_ranges;
1089 }
1090
1091 static int split_positive_from_negative(struct expression *expr)
1092 {
1093 struct returned_state_callback *cb;
1094 struct range_list *rl;
1095 const char *return_ranges;
1096 struct range_list *ret_rl;
1097 int undo;
1098
1099 /* We're going to print the states 3 times */
1100 if (stree_count(__get_cur_stree()) > 10000 / 3)
1101 return 0;
1102
1103 if (!get_implied_rl(expr, &rl) || !rl)
1104 return 0;
1105 if (is_whole_rl(rl) || is_whole_rl_non_zero(rl))
1106 return 0;
1107 /* Forget about INT_MAX and larger */
1108 if (rl_max(rl).value <= 0)
1109 return 0;
1110 if (!sval_is_negative(rl_min(rl)))
1111 return 0;
1112
1113 if (!assume(compare_expression(expr, '>', zero_expr())))
1114 return 0;
1115
1116 return_id++;
1117 return_ranges = get_return_ranges_str(expr, &ret_rl);
1118 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));
1119 FOR_EACH_PTR(returned_state_callbacks, cb) {
1120 cb->callback(return_id, (char *)return_ranges, expr);
1121 } END_FOR_EACH_PTR(cb);
1122
1123 end_assume();
1124
1125 if (rl_has_sval(rl, sval_type_val(rl_type(rl), 0))) {
1126 undo = assume(compare_expression(expr, SPECIAL_EQUAL, zero_expr()));
1127
1128 return_id++;
1129 return_ranges = get_return_ranges_str(expr, &ret_rl);
1130 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));
1131 FOR_EACH_PTR(returned_state_callbacks, cb) {
1132 cb->callback(return_id, (char *)return_ranges, expr);
1133 } END_FOR_EACH_PTR(cb);
1134
1135 if (undo)
1136 end_assume();
1137 }
1138
1139 undo = assume(compare_expression(expr, '<', zero_expr()));
1140
1141 return_id++;
1142 return_ranges = get_return_ranges_str(expr, &ret_rl);
1143 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));
1144 FOR_EACH_PTR(returned_state_callbacks, cb) {
1145 cb->callback(return_id, (char *)return_ranges, expr);
1146 } END_FOR_EACH_PTR(cb);
1147
1148 if (undo)
1149 end_assume();
1150
1151 return 1;
1152 }
1153
1154 static int call_return_state_hooks_split_null_non_null(struct expression *expr)
1155 {
1156 struct returned_state_callback *cb;
1157 struct range_list *rl;
1158 struct range_list *nonnull_rl;
1159 sval_t null_sval;
1160 struct range_list *null_rl = NULL;
1161 char *return_ranges;
1162 struct smatch_state *state;
1163 int nr_states;
1164 int final_pass_orig = final_pass;
1165
1166 if (!expr || expr_equal_to_param(expr, -1))
1167 return 0;
1168 if (expr->type == EXPR_CALL)
1169 return 0;
1170 if (!is_pointer(expr))
1171 return 0;
1172
1173 state = get_state_expr(SMATCH_EXTRA, expr);
1174 if (!state || !estate_rl(state))
1175 return 0;
1176 if (estate_min(state).value == 0 && estate_max(state).value == 0)
1177 return 0;
1178 if (!rl_has_sval(estate_rl(state), sval_type_val(estate_type(state), 0)))
1179 return 0;
1180
1181 nr_states = stree_count(__get_cur_stree());
1182 if (option_info && nr_states >= 1500)
1183 return 0;
1184
1185 rl = estate_rl(state);
1186
1187 __push_fake_cur_stree();
1188
1189 final_pass = 0;
1190 __split_whole_condition(expr);
1191 final_pass = final_pass_orig;
1192
1193 nonnull_rl = rl_filter(rl, rl_zero());
1194 return_ranges = show_rl(nonnull_rl);
1195 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(nonnull_rl));
1196
1197 return_id++;
1198 FOR_EACH_PTR(returned_state_callbacks, cb) {
1199 cb->callback(return_id, return_ranges, expr);
1200 } END_FOR_EACH_PTR(cb);
1201
1202 __push_true_states();
1203 __use_false_states();
1204
1205 return_ranges = alloc_sname("0");
1206 null_sval = sval_type_val(rl_type(rl), 0);
1207 add_range(&null_rl, null_sval, null_sval);
1208 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(null_rl));
1209 return_id++;
1210 FOR_EACH_PTR(returned_state_callbacks, cb) {
1211 cb->callback(return_id, return_ranges, expr);
1212 } END_FOR_EACH_PTR(cb);
1213
1214 __merge_true_states();
1215 __free_fake_cur_stree();
1216
1217 return 1;
1218 }
1219
1220 static int call_return_state_hooks_split_success_fail(struct expression *expr)
1221 {
1222 struct range_list *rl;
1223 struct range_list *nonzero_rl;
1224 sval_t zero_sval;
1225 struct range_list *zero_rl = NULL;
1226 int nr_states;
1227 struct returned_state_callback *cb;
1228 char *return_ranges;
1229 int final_pass_orig = final_pass;
1230 sval_t val;
1231
1232 if (option_project != PROJ_KERNEL)
1233 return 0;
1234
1235 nr_states = stree_count(__get_cur_stree());
1236 if (nr_states > 1500)
1237 return 0;
1238
1239 if (get_value(expr, &val))
1240 return 0;
1241 if (!get_implied_rl(expr, &rl))
1242 return 0;
1243 if (rl_min(rl).value < -4095 || rl_min(rl).value >= 0)
1244 return 0;
1245 if (rl_max(rl).value != 0)
1246 return 0;
1247
1248 __push_fake_cur_stree();
1249
1250 final_pass = 0;
1251 __split_whole_condition(expr);
1252 final_pass = final_pass_orig;
1253
1254 nonzero_rl = rl_filter(rl, rl_zero());
1255 return_ranges = show_rl(nonzero_rl);
1256 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(nonzero_rl));
1257
1258 return_id++;
1259 FOR_EACH_PTR(returned_state_callbacks, cb) {
1260 cb->callback(return_id, return_ranges, expr);
1261 } END_FOR_EACH_PTR(cb);
1262
1263 __push_true_states();
1264 __use_false_states();
1265
1266 return_ranges = alloc_sname("0");
1267 zero_sval = sval_type_val(rl_type(rl), 0);
1268 add_range(&zero_rl, zero_sval, zero_sval);
1269 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(zero_rl));
1270 return_id++;
1271 FOR_EACH_PTR(returned_state_callbacks, cb) {
1272 cb->callback(return_id, return_ranges, expr);
1273 } END_FOR_EACH_PTR(cb);
1274
1275 __merge_true_states();
1276 __free_fake_cur_stree();
1277
1278 return 1;
1279 }
1280
1281 static int is_boolean(struct expression *expr)
1282 {
1283 struct range_list *rl;
1284
1285 if (!get_implied_rl(expr, &rl))
1286 return 0;
1287 if (rl_min(rl).value == 0 && rl_max(rl).value == 1)
1288 return 1;
1289 return 0;
1290 }
1291
1292 static int is_conditional(struct expression *expr)
1293 {
1294 if (!expr)
1295 return 0;
1296 if (expr->type == EXPR_CONDITIONAL || expr->type == EXPR_SELECT)
1297 return 1;
1298 return 0;
1299 }
1300
1301 static int splitable_function_call(struct expression *expr)
1302 {
1303 struct sm_state *sm;
1304 char buf[64];
1305
1306 if (!expr || expr->type != EXPR_CALL)
1307 return 0;
1308 snprintf(buf, sizeof(buf), "return %p", expr);
1309 sm = get_sm_state(SMATCH_EXTRA, buf, NULL);
1310 return split_possible_helper(sm, expr);
1311 }
1312
1313 static struct sm_state *find_bool_param(void)
1314 {
1315 struct stree *start_states;
1316 struct symbol *arg;
1317 struct sm_state *sm, *tmp;
1318 sval_t sval;
1319
1320 start_states = get_start_states();
1321
1322 FOR_EACH_PTR_REVERSE(cur_func_sym->ctype.base_type->arguments, arg) {
1323 if (!arg->ident)
1324 continue;
1325 sm = get_sm_state_stree(start_states, SMATCH_EXTRA, arg->ident->name, arg);
1326 if (!sm)
1327 continue;
1328 if (rl_min(estate_rl(sm->state)).value != 0 ||
1329 rl_max(estate_rl(sm->state)).value != 1)
1330 continue;
1331 goto found;
1332 } END_FOR_EACH_PTR_REVERSE(arg);
1333
1334 return NULL;
1335
1336 found:
1337 /*
1338 * Check if it's splitable. If not, then splitting it up is likely not
1339 * useful for the callers.
1340 */
1341 FOR_EACH_PTR(sm->possible, tmp) {
1342 if (is_merged(tmp))
1343 continue;
1344 if (!estate_get_single_value(tmp->state, &sval))
1345 return NULL;
1346 } END_FOR_EACH_PTR(tmp);
1347
1348 return sm;
1349 }
1350
1351 static int split_on_bool_sm(struct sm_state *sm, struct expression *expr)
1352 {
1353 struct returned_state_callback *cb;
1354 struct range_list *ret_rl;
1355 const char *return_ranges;
1356 struct sm_state *tmp;
1357 int ret = 0;
1358 int nr_possible, nr_states;
1359 char *compare_str = NULL;
1360 char buf[128];
1361 struct state_list *already_handled = NULL;
1362
1363 if (!sm || !sm->merged)
1364 return 0;
1365
1366 if (too_many_possible(sm))
1367 return 0;
1368
1369 /* bail if it gets too complicated */
1370 nr_possible = ptr_list_size((struct ptr_list *)sm->possible);
1371 nr_states = stree_count(__get_cur_stree());
1372 if (option_info && nr_states * nr_possible >= 2000)
1373 return 0;
1374
1375 FOR_EACH_PTR(sm->possible, tmp) {
1376 if (tmp->merged)
1377 continue;
1378 if (ptr_in_list(tmp, already_handled))
1379 continue;
1380 add_ptr_list(&already_handled, tmp);
1381
1382 ret = 1;
1383 __push_fake_cur_stree();
1384
1385 overwrite_states_using_pool(sm, tmp);
1386
1387 return_ranges = get_return_ranges_str(expr, &ret_rl);
1388 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));
1389 compare_str = expr_lte_to_param(expr, -1);
1390 if (compare_str) {
1391 snprintf(buf, sizeof(buf), "%s%s", return_ranges, compare_str);
1392 return_ranges = alloc_sname(buf);
1393 }
1394
1395 return_id++;
1396 FOR_EACH_PTR(returned_state_callbacks, cb) {
1397 cb->callback(return_id, (char *)return_ranges, expr);
1398 } END_FOR_EACH_PTR(cb);
1399
1400 __free_fake_cur_stree();
1401 } END_FOR_EACH_PTR(tmp);
1402
1403 free_slist(&already_handled);
1404
1405 return ret;
1406 }
1407
1408 static int split_by_bool_param(struct expression *expr)
1409 {
1410 struct sm_state *start_sm, *sm;
1411 sval_t sval;
1412
1413 start_sm = find_bool_param();
1414 if (!start_sm)
1415 return 0;
1416 sm = get_sm_state(SMATCH_EXTRA, start_sm->name, start_sm->sym);
1417 if (!sm || estate_get_single_value(sm->state, &sval))
1418 return 0;
1419 return split_on_bool_sm(sm, expr);
1420 }
1421
1422 static void call_return_state_hooks(struct expression *expr)
1423 {
1424 struct returned_state_callback *cb;
1425 struct range_list *ret_rl;
1426 const char *return_ranges;
1427 int nr_states;
1428 sval_t sval;
1429
1430 if (__path_is_null())
1431 return;
1432
1433 expr = strip_expr(expr);
1434
1435 if (is_impossible_path())
1436 goto vanilla;
1437
1438 if (expr && (expr->type == EXPR_COMPARE ||
1439 !get_implied_value(expr, &sval)) &&
1440 (is_condition(expr) || is_boolean(expr))) {
1441 call_return_state_hooks_compare(expr);
1442 return;
1443 } else if (is_conditional(expr)) {
1444 call_return_state_hooks_conditional(expr);
1445 return;
1446 } else if (call_return_state_hooks_split_possible(expr)) {
1447 return;
1448 } else if (call_return_state_hooks_split_null_non_null(expr)) {
1449 return;
1450 } else if (call_return_state_hooks_split_success_fail(expr)) {
1451 return;
1452 } else if (splitable_function_call(expr)) {
1453 return;
1454 } else if (split_positive_from_negative(expr)) {
1455 return;
1456 } else if (split_by_bool_param(expr)) {
1457 return;
1458 }
1459
1460 vanilla:
1461 return_ranges = get_return_ranges_str(expr, &ret_rl);
1462 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));
1463
1464 return_id++;
1465 nr_states = stree_count(__get_cur_stree());
1466 if (nr_states >= 10000) {
1467 match_return_info(return_id, (char *)return_ranges, expr);
1468 return;
1469 }
1470 FOR_EACH_PTR(returned_state_callbacks, cb) {
1471 cb->callback(return_id, (char *)return_ranges, expr);
1472 } END_FOR_EACH_PTR(cb);
1473 }
1474
1475 static void print_returned_struct_members(int return_id, char *return_ranges, struct expression *expr)
1476 {
1477 struct returned_member_callback *cb;
1478 struct stree *stree;
1479 struct sm_state *sm;
1480 struct symbol *type;
1481 char *name;
1482 char member_name[256];
1483 int len;
1484
1485 type = get_type(expr);
1486 if (!type || type->type != SYM_PTR)
1487 return;
1488 name = expr_to_var(expr);
1489 if (!name)
1490 return;
1491
1492 member_name[sizeof(member_name) - 1] = '\0';
1493 strcpy(member_name, "$");
1494
1495 len = strlen(name);
1496 FOR_EACH_PTR(returned_member_callbacks, cb) {
1497 stree = __get_cur_stree();
1498 FOR_EACH_MY_SM(cb->owner, stree, sm) {
1499 if (sm->name[0] == '*' && strcmp(sm->name + 1, name) == 0) {
1500 strcpy(member_name, "*$");
1501 cb->callback(return_id, return_ranges, expr, member_name, sm->state);
1502 continue;
1503 }
1504 if (strncmp(sm->name, name, len) != 0)
1505 continue;
1506 if (strncmp(sm->name + len, "->", 2) != 0)
1507 continue;
1508 snprintf(member_name, sizeof(member_name), "$%s", sm->name + len);
1509 cb->callback(return_id, return_ranges, expr, member_name, sm->state);
1510 } END_FOR_EACH_SM(sm);
1511 } END_FOR_EACH_PTR(cb);
1512
1513 free_string(name);
1514 }
1515
1516 static void reset_memdb(struct symbol *sym)
1517 {
1518 mem_sql(NULL, NULL, "delete from caller_info;");
1519 mem_sql(NULL, NULL, "delete from return_states;");
1520 mem_sql(NULL, NULL, "delete from call_implies;");
1521 }
1522
1523 static void match_end_func_info(struct symbol *sym)
1524 {
1525 if (__path_is_null())
1526 return;
1527 call_return_state_hooks(NULL);
1528 }
1529
1530 static void match_after_func(struct symbol *sym)
1531 {
1532 if (!__inline_fn)
1533 reset_memdb(sym);
1534 }
1535
1536 static void init_memdb(void)
1537 {
1538 char *err = NULL;
1539 int rc;
1540 const char *schema_files[] = {
1541 "db/db.schema",
1542 "db/caller_info.schema",
1543 "db/return_states.schema",
1544 "db/function_type_size.schema",
1545 "db/type_size.schema",
1546 "db/call_implies.schema",
1547 "db/function_ptr.schema",
1548 "db/local_values.schema",
1549 "db/function_type_value.schema",
1550 "db/type_value.schema",
1551 "db/function_type_info.schema",
1552 "db/data_info.schema",
1553 };
1554 static char buf[4096];
1555 int fd;
1556 int ret;
1557 int i;
1558
1559 rc = sqlite3_open(":memory:", &mem_db);
1560 if (rc != SQLITE_OK) {
1561 printf("Error starting In-Memory database.");
1562 return;
1563 }
1564
1565 for (i = 0; i < ARRAY_SIZE(schema_files); i++) {
1566 fd = open_data_file(schema_files[i]);
1567 if (fd < 0) {
1568 mem_db = NULL;
1569 return;
1570 }
1571 ret = read(fd, buf, sizeof(buf));
1572 if (ret == sizeof(buf)) {
1573 printf("Schema file too large: %s (limit %zd bytes)",
1574 schema_files[i], sizeof(buf));
1575 }
1576 buf[ret] = '\0';
1577 rc = sqlite3_exec(mem_db, buf, NULL, NULL, &err);
1578 if (rc != SQLITE_OK) {
1579 fprintf(stderr, "SQL error #2: %s\n", err);
1580 fprintf(stderr, "%s\n", buf);
1581 }
1582 }
1583 }
1584
1585 void open_smatch_db(void)
1586 {
1587 int rc;
1588
1589 if (option_no_db)
1590 return;
1591
1592 init_memdb();
1593
1594 rc = sqlite3_open_v2("smatch_db.sqlite", &db, SQLITE_OPEN_READONLY, NULL);
1595 if (rc != SQLITE_OK) {
1596 option_no_db = 1;
1597 return;
1598 }
1599 return;
1600 }
1601
1602 static void register_common_funcs(void)
1603 {
1604 struct token *token;
1605 char *func;
1606 char filename[256];
1607
1608 if (option_project == PROJ_NONE)
1609 strcpy(filename, "common_functions");
1610 else
1611 snprintf(filename, 256, "%s.common_functions", option_project_str);
1612
1613 token = get_tokens_file(filename);
1614 if (!token)
1615 return;
1616 if (token_type(token) != TOKEN_STREAMBEGIN)
1617 return;
1618 token = token->next;
1619 while (token_type(token) != TOKEN_STREAMEND) {
1620 if (token_type(token) != TOKEN_IDENT)
1621 return;
1622 func = alloc_string(show_ident(token->ident));
1623 add_ptr_list(&common_funcs, func);
1624 token = token->next;
1625 }
1626 clear_token_alloc();
1627 }
1628
1629
1630 void register_definition_db_callbacks(int id)
1631 {
1632 add_hook(&match_call_info, FUNCTION_CALL_HOOK);
1633 add_hook(&global_variable, BASE_HOOK);
1634 add_hook(&global_variable, DECLARATION_HOOK);
1635 add_split_return_callback(match_return_info);
1636 add_split_return_callback(print_returned_struct_members);
1637 add_hook(&call_return_state_hooks, RETURN_HOOK);
1638 add_hook(&match_end_func_info, END_FUNC_HOOK);
1639 add_hook(&match_after_func, AFTER_FUNC_HOOK);
1640
1641 add_hook(&match_data_from_db, FUNC_DEF_HOOK);
1642 add_hook(&match_call_implies, CALL_HOOK_AFTER_INLINE);
1643
1644 register_common_funcs();
1645 }
1646
1647 void register_db_call_marker(int id)
1648 {
1649 add_hook(&match_call_marker, FUNCTION_CALL_HOOK);
1650 }
1651
1652 char *return_state_to_var_sym(struct expression *expr, int param, const char *key, struct symbol **sym)
1653 {
1654 struct expression *arg;
1655 char *name = NULL;
1656 char member_name[256];
1657
1658 *sym = NULL;
1659
1660 if (param == -1) {
1661 const char *star = "";
1662
1663 if (expr->type != EXPR_ASSIGNMENT)
1664 return NULL;
1665 name = expr_to_var_sym(expr->left, sym);
1666 if (!name)
1667 return NULL;
1668 if (key[0] == '*') {
1669 star = "*";
1670 key++;
1671 }
1672 if (strncmp(key, "$", 1) != 0)
1673 return name;
1674 snprintf(member_name, sizeof(member_name), "%s%s%s", star, name, key + 1);
1675 free_string(name);
1676 return alloc_string(member_name);
1677 }
1678
1679 while (expr->type == EXPR_ASSIGNMENT)
1680 expr = strip_expr(expr->right);
1681 if (expr->type != EXPR_CALL)
1682 return NULL;
1683
1684 arg = get_argument_from_call_expr(expr->args, param);
1685 if (!arg)
1686 return NULL;
1687
1688 return get_variable_from_key(arg, key, sym);
1689 }
1690
1691 char *get_variable_from_key(struct expression *arg, const char *key, struct symbol **sym)
1692 {
1693 char buf[256];
1694 char *tmp;
1695
1696 if (!arg)
1697 return NULL;
1698
1699 arg = strip_expr(arg);
1700
1701 if (strcmp(key, "$") == 0)
1702 return expr_to_var_sym(arg, sym);
1703
1704 if (strcmp(key, "*$") == 0) {
1705 if (arg->type == EXPR_PREOP && arg->op == '&') {
1706 arg = strip_expr(arg->unop);
1707 return expr_to_var_sym(arg, sym);
1708 } else {
1709 tmp = expr_to_var_sym(arg, sym);
1710 if (!tmp)
1711 return NULL;
1712 snprintf(buf, sizeof(buf), "*%s", tmp);
1713 free_string(tmp);
1714 return alloc_string(buf);
1715 }
1716 }
1717
1718 if (arg->type == EXPR_PREOP && arg->op == '&') {
1719 arg = strip_expr(arg->unop);
1720 tmp = expr_to_var_sym(arg, sym);
1721 if (!tmp)
1722 return NULL;
1723 snprintf(buf, sizeof(buf), "%s.%s", tmp, key + 3);
1724 return alloc_string(buf);
1725 }
1726
1727 tmp = expr_to_var_sym(arg, sym);
1728 if (!tmp)
1729 return NULL;
1730 snprintf(buf, sizeof(buf), "%s%s", tmp, key + 1);
1731 free_string(tmp);
1732 return alloc_string(buf);
1733 }
1734
1735 char *get_chunk_from_key(struct expression *arg, char *key, struct symbol **sym, struct var_sym_list **vsl)
1736 {
1737 *vsl = NULL;
1738
1739 if (strcmp("$", key) == 0)
1740 return expr_to_chunk_sym_vsl(arg, sym, vsl);
1741 return get_variable_from_key(arg, key, sym);
1742 }
1743
1744 const char *get_param_name_var_sym(const char *name, struct symbol *sym)
1745 {
1746 char *param_name;
1747 int name_len;
1748 static char buf[256];
1749
1750 if (!sym || !sym->ident)
1751 return NULL;
1752
1753 param_name = sym->ident->name;
1754 name_len = strlen(param_name);
1755
1756 if (strcmp(name, param_name) == 0) {
1757 return "$";
1758 } else if (name[name_len] == '-' && /* check for '-' from "->" */
1759 strncmp(name, param_name, name_len) == 0) {
1760 snprintf(buf, sizeof(buf), "$%s", name + name_len);
1761 return buf;
1762 } else if (name[0] == '*' && strcmp(name + 1, param_name) == 0) {
1763 return "*$";
1764 }
1765 return NULL;
1766 }
1767
1768 const char *get_param_name(struct sm_state *sm)
1769 {
1770 return get_param_name_var_sym(sm->name, sm->sym);
1771 }
1772
1773 char *get_data_info_name(struct expression *expr)
1774 {
1775 struct symbol *sym;
1776 char *name;
1777 char buf[256];
1778 char *ret = NULL;
1779
1780 expr = strip_expr(expr);
1781 name = get_member_name(expr);
1782 if (name)
1783 return name;
1784 name = expr_to_var_sym(expr, &sym);
1785 if (!name || !sym)
1786 goto free;
1787 if (!(sym->ctype.modifiers & MOD_TOPLEVEL))
1788 goto free;
1789 if (sym->ctype.modifiers & MOD_STATIC)
1790 snprintf(buf, sizeof(buf), "static %s", name);
1791 else
1792 snprintf(buf, sizeof(buf), "global %s", name);
1793 ret = alloc_sname(buf);
1794 free:
1795 free_string(name);
1796 return ret;
1797 }
Static analysis for C