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real_absolute: introduce get_real_absolute_var_sym()
[smatch.git] / smatch_db.c
blob5b207f1ccfe727bbb91025a1636090eb7ecfadb2
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(int param, const char *value)
249 {
250 sql_insert(function_type, "'%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 void sql_insert_data_info_var_sym(const char *var, struct symbol *sym, int type, const char *value)
267 {
268 sql_insert(data_info, "'%s', '%s', %d, '%s'",
269 (sym->ctype.modifiers & MOD_STATIC) ? get_base_file() : "extern",
270 var, type, value);
271 }
272
273 char *get_static_filter(struct symbol *sym)
274 {
275 static char sql_filter[1024];
276
277 /* This can only happen on buggy code. Return invalid SQL. */
278 if (!sym) {
279 sql_filter[0] = '\0';
280 return sql_filter;
281 }
282
283 if (sym->ctype.modifiers & MOD_STATIC) {
284 snprintf(sql_filter, sizeof(sql_filter),
285 "file = '%s' and function = '%s' and static = '1'",
286 get_base_file(), sym->ident->name);
287 } else {
288 snprintf(sql_filter, sizeof(sql_filter),
289 "function = '%s' and static = '0'", sym->ident->name);
290 }
291
292 return sql_filter;
293 }
294
295 static int get_row_count(void *_row_count, int argc, char **argv, char **azColName)
296 {
297 int *row_count = _row_count;
298
299 *row_count = 0;
300 if (argc != 1)
301 return 0;
302 *row_count = atoi(argv[0]);
303 return 0;
304 }
305
306 static void sql_select_return_states_pointer(const char *cols,
307 struct expression *call, int (*callback)(void*, int, char**, char**), void *info)
308 {
309 char *ptr;
310 int return_count;
311
312 ptr = get_fnptr_name(call->fn);
313 if (!ptr)
314 return;
315
316 run_sql(get_row_count, &return_count,
317 "select count(*) from return_states join function_ptr "
318 "where return_states.function == function_ptr.function and "
319 "ptr = '%s' and searchable = 1 and type = %d;", ptr, INTERNAL);
320 /* The magic number 100 is just from testing on the kernel. */
321 if (return_count > 100)
322 return;
323
324 run_sql(callback, info,
325 "select %s from return_states join function_ptr where "
326 "return_states.function == function_ptr.function and ptr = '%s' "
327 "and searchable = 1 "
328 "order by function_ptr.file, return_states.file, return_id, type;",
329 cols, ptr);
330 }
331
332 static int is_local_symbol(struct expression *expr)
333 {
334 if (expr->type != EXPR_SYMBOL)
335 return 0;
336 if (expr->symbol->ctype.modifiers & (MOD_NONLOCAL | MOD_STATIC | MOD_ADDRESSABLE))
337 return 0;
338 return 1;
339 }
340
341 void sql_select_return_states(const char *cols, struct expression *call,
342 int (*callback)(void*, int, char**, char**), void *info)
343 {
344 int row_count;
345
346 if (is_fake_call(call))
347 return;
348
349 if (call->fn->type != EXPR_SYMBOL || !call->fn->symbol || is_local_symbol(call->fn)) {
350 sql_select_return_states_pointer(cols, call, callback, info);
351 return;
352 }
353
354 if (inlinable(call->fn)) {
355 mem_sql(callback, info,
356 "select %s from return_states where call_id = '%lu' order by return_id, type;",
357 cols, (unsigned long)call);
358 return;
359 }
360
361 run_sql(get_row_count, &row_count, "select count(*) from return_states where %s;",
362 get_static_filter(call->fn->symbol));
363 if (row_count > 3000)
364 return;
365
366 run_sql(callback, info, "select %s from return_states where %s order by file, return_id, type;",
367 cols, get_static_filter(call->fn->symbol));
368 }
369
370 void sql_select_call_implies(const char *cols, struct expression *call,
371 int (*callback)(void*, int, char**, char**))
372 {
373 if (call->fn->type != EXPR_SYMBOL || !call->fn->symbol)
374 return;
375
376 if (inlinable(call->fn)) {
377 mem_sql(callback, call,
378 "select %s from call_implies where call_id = '%lu';",
379 cols, (unsigned long)call);
380 return;
381 }
382
383 run_sql(callback, call, "select %s from call_implies where %s;",
384 cols, get_static_filter(call->fn->symbol));
385 }
386
387 void sql_select_caller_info(const char *cols, struct symbol *sym,
388 int (*callback)(void*, int, char**, char**))
389 {
390 if (__inline_fn) {
391 mem_sql(callback, NULL,
392 "select %s from caller_info where call_id = %lu;",
393 cols, (unsigned long)__inline_fn);
394 return;
395 }
396
397 run_sql(callback, NULL,
398 "select %s from caller_info where %s order by call_id;",
399 cols, get_static_filter(sym));
400 }
401
402 void select_caller_info_hook(void (*callback)(const char *name, struct symbol *sym, char *key, char *value), int type)
403 {
404 struct def_callback *def_callback = __alloc_def_callback(0);
405
406 def_callback->hook_type = type;
407 def_callback->callback = callback;
408 add_ptr_list(&callbacks, def_callback);
409 }
410
411 /*
412 * These call backs are used when the --info option is turned on to print struct
413 * member information. For example foo->bar could have a state in
414 * smatch_extra.c and also check_user.c.
415 */
416 void add_member_info_callback(int owner, void (*callback)(struct expression *call, int param, char *printed_name, struct sm_state *sm))
417 {
418 struct member_info_callback *member_callback = __alloc_member_info_callback(0);
419
420 member_callback->owner = owner;
421 member_callback->callback = callback;
422 add_ptr_list(&member_callbacks, member_callback);
423 }
424
425 void add_split_return_callback(void (*fn)(int return_id, char *return_ranges, struct expression *returned_expr))
426 {
427 struct returned_state_callback *callback = __alloc_returned_state_callback(0);
428
429 callback->callback = fn;
430 add_ptr_list(&returned_state_callbacks, callback);
431 }
432
433 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))
434 {
435 struct returned_member_callback *member_callback = __alloc_returned_member_callback(0);
436
437 member_callback->owner = owner;
438 member_callback->callback = callback;
439 add_ptr_list(&returned_member_callbacks, member_callback);
440 }
441
442 void select_call_implies_hook(int type, void (*callback)(struct expression *arg, char *key, char *value))
443 {
444 struct call_implies_callback *cb = __alloc_call_implies_callback(0);
445
446 cb->type = type;
447 cb->callback = callback;
448 add_ptr_list(&call_implies_cb_list, cb);
449 }
450
451 struct return_info {
452 struct expression *static_returns_call;
453 struct symbol *return_type;
454 struct range_list *return_range_list;
455 };
456
457 static int db_return_callback(void *_ret_info, int argc, char **argv, char **azColName)
458 {
459 struct return_info *ret_info = _ret_info;
460 struct range_list *rl;
461 struct expression *call_expr = ret_info->static_returns_call;
462
463 if (argc != 1)
464 return 0;
465 call_results_to_rl(call_expr, ret_info->return_type, argv[0], &rl);
466 ret_info->return_range_list = rl_union(ret_info->return_range_list, rl);
467 return 0;
468 }
469
470 struct range_list *db_return_vals(struct expression *expr)
471 {
472 struct return_info ret_info = {};
473 char buf[64];
474 struct sm_state *sm;
475
476 if (is_fake_call(expr))
477 return NULL;
478
479 snprintf(buf, sizeof(buf), "return %p", expr);
480 sm = get_sm_state(SMATCH_EXTRA, buf, NULL);
481 if (sm)
482 return clone_rl(estate_rl(sm->state));
483 ret_info.static_returns_call = expr;
484 ret_info.return_type = get_type(expr);
485 if (!ret_info.return_type)
486 return NULL;
487
488 if (expr->fn->type != EXPR_SYMBOL || !expr->fn->symbol)
489 return NULL;
490
491 ret_info.return_range_list = NULL;
492 if (inlinable(expr->fn)) {
493 mem_sql(db_return_callback, &ret_info,
494 "select distinct return from return_states where call_id = '%lu';",
495 (unsigned long)expr);
496 } else {
497 run_sql(db_return_callback, &ret_info,
498 "select distinct return from return_states where %s;",
499 get_static_filter(expr->fn->symbol));
500 }
501 return ret_info.return_range_list;
502 }
503
504 struct range_list *db_return_vals_from_str(const char *fn_name)
505 {
506 struct return_info ret_info;
507
508 ret_info.static_returns_call = NULL;
509 ret_info.return_type = &llong_ctype;
510 ret_info.return_range_list = NULL;
511
512 run_sql(db_return_callback, &ret_info,
513 "select distinct return from return_states where function = '%s';",
514 fn_name);
515 return ret_info.return_range_list;
516 }
517
518 static void match_call_marker(struct expression *expr)
519 {
520 /*
521 * we just want to record something in the database so that if we have
522 * two calls like: frob(4); frob(some_unkown); then on the receiving
523 * side we know that sometimes frob is called with unknown parameters.
524 */
525
526 sql_insert_caller_info(expr, INTERNAL, -1, "%call_marker%", "");
527 }
528
529 static void print_struct_members(struct expression *call, struct expression *expr, int param, struct stree *stree,
530 void (*callback)(struct expression *call, int param, char *printed_name, struct sm_state *sm))
531 {
532 struct sm_state *sm;
533 char *name;
534 struct symbol *sym;
535 int len;
536 char printed_name[256];
537 int is_address = 0;
538
539 expr = strip_expr(expr);
540 if (expr->type == EXPR_PREOP && expr->op == '&') {
541 expr = strip_expr(expr->unop);
542 is_address = 1;
543 }
544
545 name = expr_to_var_sym(expr, &sym);
546 if (!name || !sym)
547 goto free;
548
549 len = strlen(name);
550 FOR_EACH_SM(stree, sm) {
551 if (sm->sym != sym)
552 continue;
553 if (strcmp(name, sm->name) == 0) {
554 if (is_address)
555 snprintf(printed_name, sizeof(printed_name), "*$");
556 else /* these are already handled. fixme: handle them here */
557 continue;
558 } else if (sm->name[0] == '*' && strcmp(name, sm->name + 1) == 0) {
559 snprintf(printed_name, sizeof(printed_name), "*$");
560 } else if (strncmp(name, sm->name, len) == 0) {
561 if (isalnum(sm->name[len]))
562 continue;
563 if (is_address)
564 snprintf(printed_name, sizeof(printed_name), "$->%s", sm->name + len + 1);
565 else
566 snprintf(printed_name, sizeof(printed_name), "$%s", sm->name + len);
567 } else {
568 continue;
569 }
570 callback(call, param, printed_name, sm);
571 } END_FOR_EACH_SM(sm);
572 free:
573 free_string(name);
574 }
575
576 static void match_call_info(struct expression *call)
577 {
578 struct member_info_callback *cb;
579 struct expression *arg;
580 struct stree *stree;
581 char *name;
582 int i;
583
584 name = get_fnptr_name(call->fn);
585 if (!name)
586 return;
587
588 FOR_EACH_PTR(member_callbacks, cb) {
589 stree = get_all_states_stree(cb->owner);
590 i = 0;
591 FOR_EACH_PTR(call->args, arg) {
592 print_struct_members(call, arg, i, stree, cb->callback);
593 i++;
594 } END_FOR_EACH_PTR(arg);
595 free_stree(&stree);
596 } END_FOR_EACH_PTR(cb);
597
598 free_string(name);
599 }
600
601 static int get_param(int param, char **name, struct symbol **sym)
602 {
603 struct symbol *arg;
604 int i;
605
606 i = 0;
607 FOR_EACH_PTR(cur_func_sym->ctype.base_type->arguments, arg) {
608 /*
609 * this is a temporary hack to work around a bug (I think in sparse?)
610 * 2.6.37-rc1:fs/reiserfs/journal.o
611 * If there is a function definition without parameter name found
612 * after a function implementation then it causes a crash.
613 * int foo() {}
614 * int bar(char *);
615 */
616 if (arg->ident->name < (char *)100)
617 continue;
618 if (i == param) {
619 *name = arg->ident->name;
620 *sym = arg;
621 return TRUE;
622 }
623 i++;
624 } END_FOR_EACH_PTR(arg);
625
626 return FALSE;
627 }
628
629 static struct stree *final_states;
630 static int prev_func_id = -1;
631 static int caller_info_callback(void *unused, int argc, char **argv, char **azColName)
632 {
633 int func_id;
634 long type;
635 long param;
636 char *key;
637 char *value;
638 char *name = NULL;
639 struct symbol *sym = NULL;
640 struct def_callback *def_callback;
641 struct stree *stree;
642
643 if (argc != 5)
644 return 0;
645
646 func_id = atoi(argv[0]);
647 errno = 0;
648 type = strtol(argv[1], NULL, 10);
649 param = strtol(argv[2], NULL, 10);
650 if (errno)
651 return 0;
652 key = argv[3];
653 value = argv[4];
654
655
656 if (prev_func_id == -1)
657 prev_func_id = func_id;
658 if (func_id != prev_func_id) {
659 stree = __pop_fake_cur_stree();
660 merge_stree(&final_states, stree);
661 free_stree(&stree);
662 __push_fake_cur_stree();
663 __unnullify_path();
664 prev_func_id = func_id;
665 }
666
667 if (param >= 0 && !get_param(param, &name, &sym))
668 return 0;
669
670 FOR_EACH_PTR(callbacks, def_callback) {
671 if (def_callback->hook_type == type)
672 def_callback->callback(name, sym, key, value);
673 } END_FOR_EACH_PTR(def_callback);
674
675 return 0;
676 }
677
678 static void get_direct_callers(struct symbol *sym)
679 {
680 sql_select_caller_info("call_id, type, parameter, key, value", sym,
681 caller_info_callback);
682 }
683
684 static struct string_list *ptr_names_done;
685 static struct string_list *ptr_names;
686
687 static int get_ptr_name(void *unused, int argc, char **argv, char **azColName)
688 {
689 insert_string(&ptr_names, alloc_string(argv[0]));
690 return 0;
691 }
692
693 static char *get_next_ptr_name(void)
694 {
695 char *ptr;
696
697 FOR_EACH_PTR(ptr_names, ptr) {
698 if (list_has_string(ptr_names_done, ptr))
699 continue;
700 insert_string(&ptr_names_done, ptr);
701 return ptr;
702 } END_FOR_EACH_PTR(ptr);
703 return NULL;
704 }
705
706 static void get_ptr_names(const char *file, const char *name)
707 {
708 char sql_filter[1024];
709 int before, after;
710
711 if (file) {
712 snprintf(sql_filter, 1024, "file = '%s' and function = '%s';",
713 file, name);
714 } else {
715 snprintf(sql_filter, 1024, "function = '%s';", name);
716 }
717
718 before = ptr_list_size((struct ptr_list *)ptr_names);
719
720 run_sql(get_ptr_name, NULL,
721 "select distinct ptr from function_ptr where %s",
722 sql_filter);
723
724 after = ptr_list_size((struct ptr_list *)ptr_names);
725 if (before == after)
726 return;
727
728 while ((name = get_next_ptr_name()))
729 get_ptr_names(NULL, name);
730 }
731
732 static void match_data_from_db(struct symbol *sym)
733 {
734 struct sm_state *sm;
735 struct stree *stree;
736
737 if (!sym || !sym->ident)
738 return;
739
740 __push_fake_cur_stree();
741 __unnullify_path();
742 prev_func_id = -1;
743
744 if (!__inline_fn) {
745 char *ptr;
746
747 if (sym->ctype.modifiers & MOD_STATIC)
748 get_ptr_names(get_base_file(), sym->ident->name);
749 else
750 get_ptr_names(NULL, sym->ident->name);
751
752 if (ptr_list_size((struct ptr_list *)ptr_names) > 20) {
753 __free_ptr_list((struct ptr_list **)&ptr_names);
754 __free_ptr_list((struct ptr_list **)&ptr_names_done);
755 stree = __pop_fake_cur_stree();
756 free_stree(&stree);
757 return;
758 }
759
760 get_direct_callers(sym);
761
762 FOR_EACH_PTR(ptr_names, ptr) {
763 run_sql(caller_info_callback, NULL,
764 "select call_id, type, parameter, key, value"
765 " from caller_info where function = '%s' order by call_id",
766 ptr);
767 free_string(ptr);
768 } END_FOR_EACH_PTR(ptr);
769
770 __free_ptr_list((struct ptr_list **)&ptr_names);
771 __free_ptr_list((struct ptr_list **)&ptr_names_done);
772 } else {
773 get_direct_callers(sym);
774 }
775
776 stree = __pop_fake_cur_stree();
777 merge_stree(&final_states, stree);
778 free_stree(&stree);
779
780 FOR_EACH_SM(final_states, sm) {
781 __set_sm(sm);
782 } END_FOR_EACH_SM(sm);
783
784 free_stree(&final_states);
785 }
786
787 static int call_implies_callbacks(void *_call, int argc, char **argv, char **azColName)
788 {
789 struct expression *call_expr = _call;
790 struct call_implies_callback *cb;
791 struct expression *arg = NULL;
792 int type;
793 int param;
794
795 if (argc != 5)
796 return 0;
797
798 type = atoi(argv[1]);
799 param = atoi(argv[2]);
800
801 FOR_EACH_PTR(call_implies_cb_list, cb) {
802 if (cb->type != type)
803 continue;
804 if (param != -1) {
805 arg = get_argument_from_call_expr(call_expr->args, param);
806 if (!arg)
807 continue;
808 }
809 cb->callback(arg, argv[3], argv[4]);
810 } END_FOR_EACH_PTR(cb);
811
812 return 0;
813 }
814
815 static void match_call_implies(struct expression *expr)
816 {
817 sql_select_call_implies("function, type, parameter, key, value", expr,
818 call_implies_callbacks);
819 }
820
821 static void print_initializer_list(struct expression_list *expr_list,
822 struct symbol *struct_type)
823 {
824 struct expression *expr;
825 struct symbol *base_type;
826 char struct_name[256];
827
828 FOR_EACH_PTR(expr_list, expr) {
829 if (expr->type == EXPR_INDEX && expr->idx_expression && expr->idx_expression->type == EXPR_INITIALIZER) {
830 print_initializer_list(expr->idx_expression->expr_list, struct_type);
831 continue;
832 }
833 if (expr->type != EXPR_IDENTIFIER)
834 continue;
835 if (!expr->expr_ident)
836 continue;
837 if (!expr->ident_expression || !expr->ident_expression->symbol_name)
838 continue;
839 base_type = get_type(expr->ident_expression);
840 if (!base_type || base_type->type != SYM_FN)
841 continue;
842 snprintf(struct_name, sizeof(struct_name), "(struct %s)->%s",
843 struct_type->ident->name, expr->expr_ident->name);
844 sql_insert_function_ptr(expr->ident_expression->symbol_name->name,
845 struct_name);
846 } END_FOR_EACH_PTR(expr);
847 }
848
849 static void global_variable(struct symbol *sym)
850 {
851 struct symbol *struct_type;
852
853 if (!sym->ident)
854 return;
855 if (!sym->initializer || sym->initializer->type != EXPR_INITIALIZER)
856 return;
857 struct_type = get_base_type(sym);
858 if (!struct_type)
859 return;
860 if (struct_type->type == SYM_ARRAY) {
861 struct_type = get_base_type(struct_type);
862 if (!struct_type)
863 return;
864 }
865 if (struct_type->type != SYM_STRUCT || !struct_type->ident)
866 return;
867 print_initializer_list(sym->initializer->expr_list, struct_type);
868 }
869
870 static void match_return_info(int return_id, char *return_ranges, struct expression *expr)
871 {
872 sql_insert_return_states(return_id, return_ranges, INTERNAL, -1, "", "");
873 }
874
875 static void call_return_state_hooks_conditional(struct expression *expr)
876 {
877 struct returned_state_callback *cb;
878 struct range_list *rl;
879 char *return_ranges;
880 int final_pass_orig = final_pass;
881
882 __push_fake_cur_stree();
883
884 final_pass = 0;
885 __split_whole_condition(expr->conditional);
886 final_pass = final_pass_orig;
887
888 if (get_implied_rl(expr->cond_true, &rl))
889 rl = cast_rl(cur_func_return_type(), rl);
890 else
891 rl = cast_rl(cur_func_return_type(), alloc_whole_rl(get_type(expr->cond_true)));
892 return_ranges = show_rl(rl);
893 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(rl));
894
895 return_id++;
896 FOR_EACH_PTR(returned_state_callbacks, cb) {
897 cb->callback(return_id, return_ranges, expr);
898 } END_FOR_EACH_PTR(cb);
899
900 __push_true_states();
901 __use_false_states();
902
903 if (get_implied_rl(expr->cond_false, &rl))
904 rl = cast_rl(cur_func_return_type(), rl);
905 else
906 rl = cast_rl(cur_func_return_type(), alloc_whole_rl(get_type(expr->cond_false)));
907 return_ranges = show_rl(rl);
908 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(rl));
909
910 return_id++;
911 FOR_EACH_PTR(returned_state_callbacks, cb) {
912 cb->callback(return_id, return_ranges, expr);
913 } END_FOR_EACH_PTR(cb);
914
915 __merge_true_states();
916 __free_fake_cur_stree();
917 }
918
919 static void call_return_state_hooks_compare(struct expression *expr)
920 {
921 struct returned_state_callback *cb;
922 char *return_ranges;
923 int final_pass_orig = final_pass;
924 sval_t sval = { .type = &int_ctype };
925 sval_t ret;
926
927 if (!get_implied_value(expr, &ret))
928 ret.value = -1;
929
930 __push_fake_cur_stree();
931
932 final_pass = 0;
933 __split_whole_condition(expr);
934 final_pass = final_pass_orig;
935
936 if (ret.value != 0) {
937 return_ranges = alloc_sname("1");
938 sval.value = 1;
939 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_sval(sval));
940
941 return_id++;
942 FOR_EACH_PTR(returned_state_callbacks, cb) {
943 cb->callback(return_id, return_ranges, expr);
944 } END_FOR_EACH_PTR(cb);
945 }
946
947 __push_true_states();
948 __use_false_states();
949
950 if (ret.value != 1) {
951 return_ranges = alloc_sname("0");
952 sval.value = 0;
953 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_sval(sval));
954
955 return_id++;
956 FOR_EACH_PTR(returned_state_callbacks, cb) {
957 cb->callback(return_id, return_ranges, expr);
958 } END_FOR_EACH_PTR(cb);
959 }
960
961 __merge_true_states();
962 __free_fake_cur_stree();
963 }
964
965 static int ptr_in_list(struct sm_state *sm, struct state_list *slist)
966 {
967 struct sm_state *tmp;
968
969 FOR_EACH_PTR(slist, tmp) {
970 if (strcmp(tmp->state->name, sm->state->name) == 0)
971 return 1;
972 } END_FOR_EACH_PTR(tmp);
973
974 return 0;
975 }
976
977 static int split_possible_helper(struct sm_state *sm, struct expression *expr)
978 {
979 struct returned_state_callback *cb;
980 struct range_list *rl;
981 char *return_ranges;
982 struct sm_state *tmp;
983 int ret = 0;
984 int nr_possible, nr_states;
985 char *compare_str = NULL;
986 char buf[128];
987 struct state_list *already_handled = NULL;
988
989 if (!sm || !sm->merged)
990 return 0;
991
992 if (too_many_possible(sm))
993 return 0;
994
995 /* bail if it gets too complicated */
996 nr_possible = ptr_list_size((struct ptr_list *)sm->possible);
997 nr_states = stree_count(__get_cur_stree());
998 if (option_info && nr_states * nr_possible >= 2000)
999 return 0;
1000
1001 FOR_EACH_PTR(sm->possible, tmp) {
1002 if (tmp->merged)
1003 continue;
1004 if (ptr_in_list(tmp, already_handled))
1005 continue;
1006 add_ptr_list(&already_handled, tmp);
1007
1008 ret = 1;
1009 __push_fake_cur_stree();
1010
1011 overwrite_states_using_pool(sm, tmp);
1012
1013 rl = cast_rl(cur_func_return_type(), estate_rl(tmp->state));
1014 return_ranges = show_rl(rl);
1015 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(clone_rl(rl)));
1016 compare_str = expr_lte_to_param(expr, -1);
1017 if (compare_str) {
1018 snprintf(buf, sizeof(buf), "%s%s", return_ranges, compare_str);
1019 return_ranges = alloc_sname(buf);
1020 }
1021
1022 return_id++;
1023 FOR_EACH_PTR(returned_state_callbacks, cb) {
1024 cb->callback(return_id, return_ranges, expr);
1025 } END_FOR_EACH_PTR(cb);
1026
1027 __free_fake_cur_stree();
1028 } END_FOR_EACH_PTR(tmp);
1029
1030 free_slist(&already_handled);
1031
1032 return ret;
1033 }
1034
1035 static int call_return_state_hooks_split_possible(struct expression *expr)
1036 {
1037 struct sm_state *sm;
1038
1039 if (!expr || expr_equal_to_param(expr, -1))
1040 return 0;
1041
1042 sm = get_sm_state_expr(SMATCH_EXTRA, expr);
1043 return split_possible_helper(sm, expr);
1044 }
1045
1046 static const char *get_return_ranges_str(struct expression *expr, struct range_list **rl_p)
1047 {
1048 struct range_list *rl;
1049 char *return_ranges;
1050 sval_t sval;
1051 char *compare_str;
1052 char *math_str;
1053 char buf[128];
1054
1055 *rl_p = NULL;
1056
1057 if (!expr)
1058 return alloc_sname("");
1059
1060 if (get_implied_value(expr, &sval)) {
1061 *rl_p = alloc_rl(sval, sval);
1062 return sval_to_str(sval);
1063 }
1064
1065 compare_str = expr_equal_to_param(expr, -1);
1066 math_str = get_value_in_terms_of_parameter_math(expr);
1067
1068 if (get_implied_rl(expr, &rl)) {
1069 rl = cast_rl(cur_func_return_type(), rl);
1070 return_ranges = show_rl(rl);
1071 } else if (get_imaginary_absolute(expr, &rl)){
1072 rl = cast_rl(cur_func_return_type(), rl);
1073 return alloc_sname(show_rl(rl));
1074 } else {
1075 rl = cast_rl(cur_func_return_type(), alloc_whole_rl(get_type(expr)));
1076 return_ranges = show_rl(rl);
1077 }
1078 *rl_p = rl;
1079
1080 if (compare_str) {
1081 snprintf(buf, sizeof(buf), "%s%s", return_ranges, compare_str);
1082 return alloc_sname(buf);
1083 }
1084
1085 if (math_str) {
1086 snprintf(buf, sizeof(buf), "%s[%s]", return_ranges, math_str);
1087 return alloc_sname(buf);
1088 }
1089
1090 compare_str = expr_lte_to_param(expr, -1);
1091 if (compare_str) {
1092 snprintf(buf, sizeof(buf), "%s%s", return_ranges, compare_str);
1093 return alloc_sname(buf);
1094 }
1095 return return_ranges;
1096 }
1097
1098 static int split_positive_from_negative(struct expression *expr)
1099 {
1100 struct returned_state_callback *cb;
1101 struct range_list *rl;
1102 const char *return_ranges;
1103 struct range_list *ret_rl;
1104 int undo;
1105
1106 /* We're going to print the states 3 times */
1107 if (stree_count(__get_cur_stree()) > 10000 / 3)
1108 return 0;
1109
1110 if (!get_implied_rl(expr, &rl) || !rl)
1111 return 0;
1112 if (is_whole_rl(rl) || is_whole_rl_non_zero(rl))
1113 return 0;
1114 /* Forget about INT_MAX and larger */
1115 if (rl_max(rl).value <= 0)
1116 return 0;
1117 if (!sval_is_negative(rl_min(rl)))
1118 return 0;
1119
1120 if (!assume(compare_expression(expr, '>', zero_expr())))
1121 return 0;
1122
1123 return_id++;
1124 return_ranges = get_return_ranges_str(expr, &ret_rl);
1125 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));
1126 FOR_EACH_PTR(returned_state_callbacks, cb) {
1127 cb->callback(return_id, (char *)return_ranges, expr);
1128 } END_FOR_EACH_PTR(cb);
1129
1130 end_assume();
1131
1132 if (rl_has_sval(rl, sval_type_val(rl_type(rl), 0))) {
1133 undo = assume(compare_expression(expr, SPECIAL_EQUAL, zero_expr()));
1134
1135 return_id++;
1136 return_ranges = get_return_ranges_str(expr, &ret_rl);
1137 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));
1138 FOR_EACH_PTR(returned_state_callbacks, cb) {
1139 cb->callback(return_id, (char *)return_ranges, expr);
1140 } END_FOR_EACH_PTR(cb);
1141
1142 if (undo)
1143 end_assume();
1144 }
1145
1146 undo = assume(compare_expression(expr, '<', zero_expr()));
1147
1148 return_id++;
1149 return_ranges = get_return_ranges_str(expr, &ret_rl);
1150 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));
1151 FOR_EACH_PTR(returned_state_callbacks, cb) {
1152 cb->callback(return_id, (char *)return_ranges, expr);
1153 } END_FOR_EACH_PTR(cb);
1154
1155 if (undo)
1156 end_assume();
1157
1158 return 1;
1159 }
1160
1161 static int call_return_state_hooks_split_null_non_null(struct expression *expr)
1162 {
1163 struct returned_state_callback *cb;
1164 struct range_list *rl;
1165 struct range_list *nonnull_rl;
1166 sval_t null_sval;
1167 struct range_list *null_rl = NULL;
1168 char *return_ranges;
1169 struct smatch_state *state;
1170 int nr_states;
1171 int final_pass_orig = final_pass;
1172
1173 if (!expr || expr_equal_to_param(expr, -1))
1174 return 0;
1175 if (expr->type == EXPR_CALL)
1176 return 0;
1177 if (!is_pointer(expr))
1178 return 0;
1179
1180 state = get_state_expr(SMATCH_EXTRA, expr);
1181 if (!state || !estate_rl(state))
1182 return 0;
1183 if (estate_min(state).value == 0 && estate_max(state).value == 0)
1184 return 0;
1185 if (!rl_has_sval(estate_rl(state), sval_type_val(estate_type(state), 0)))
1186 return 0;
1187
1188 nr_states = stree_count(__get_cur_stree());
1189 if (option_info && nr_states >= 1500)
1190 return 0;
1191
1192 rl = estate_rl(state);
1193
1194 __push_fake_cur_stree();
1195
1196 final_pass = 0;
1197 __split_whole_condition(expr);
1198 final_pass = final_pass_orig;
1199
1200 nonnull_rl = rl_filter(rl, rl_zero());
1201 return_ranges = show_rl(nonnull_rl);
1202 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(nonnull_rl));
1203
1204 return_id++;
1205 FOR_EACH_PTR(returned_state_callbacks, cb) {
1206 cb->callback(return_id, return_ranges, expr);
1207 } END_FOR_EACH_PTR(cb);
1208
1209 __push_true_states();
1210 __use_false_states();
1211
1212 return_ranges = alloc_sname("0");
1213 null_sval = sval_type_val(rl_type(rl), 0);
1214 add_range(&null_rl, null_sval, null_sval);
1215 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(null_rl));
1216 return_id++;
1217 FOR_EACH_PTR(returned_state_callbacks, cb) {
1218 cb->callback(return_id, return_ranges, expr);
1219 } END_FOR_EACH_PTR(cb);
1220
1221 __merge_true_states();
1222 __free_fake_cur_stree();
1223
1224 return 1;
1225 }
1226
1227 static int call_return_state_hooks_split_success_fail(struct expression *expr)
1228 {
1229 struct range_list *rl;
1230 struct range_list *nonzero_rl;
1231 sval_t zero_sval;
1232 struct range_list *zero_rl = NULL;
1233 int nr_states;
1234 struct returned_state_callback *cb;
1235 char *return_ranges;
1236 int final_pass_orig = final_pass;
1237 sval_t val;
1238
1239 if (option_project != PROJ_KERNEL)
1240 return 0;
1241
1242 nr_states = stree_count(__get_cur_stree());
1243 if (nr_states > 1500)
1244 return 0;
1245
1246 if (get_value(expr, &val))
1247 return 0;
1248 if (!get_implied_rl(expr, &rl))
1249 return 0;
1250 if (rl_min(rl).value < -4095 || rl_min(rl).value >= 0)
1251 return 0;
1252 if (rl_max(rl).value != 0)
1253 return 0;
1254
1255 __push_fake_cur_stree();
1256
1257 final_pass = 0;
1258 __split_whole_condition(expr);
1259 final_pass = final_pass_orig;
1260
1261 nonzero_rl = rl_filter(rl, rl_zero());
1262 return_ranges = show_rl(nonzero_rl);
1263 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(nonzero_rl));
1264
1265 return_id++;
1266 FOR_EACH_PTR(returned_state_callbacks, cb) {
1267 cb->callback(return_id, return_ranges, expr);
1268 } END_FOR_EACH_PTR(cb);
1269
1270 __push_true_states();
1271 __use_false_states();
1272
1273 return_ranges = alloc_sname("0");
1274 zero_sval = sval_type_val(rl_type(rl), 0);
1275 add_range(&zero_rl, zero_sval, zero_sval);
1276 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(zero_rl));
1277 return_id++;
1278 FOR_EACH_PTR(returned_state_callbacks, cb) {
1279 cb->callback(return_id, return_ranges, expr);
1280 } END_FOR_EACH_PTR(cb);
1281
1282 __merge_true_states();
1283 __free_fake_cur_stree();
1284
1285 return 1;
1286 }
1287
1288 static int is_boolean(struct expression *expr)
1289 {
1290 struct range_list *rl;
1291
1292 if (!get_implied_rl(expr, &rl))
1293 return 0;
1294 if (rl_min(rl).value == 0 && rl_max(rl).value == 1)
1295 return 1;
1296 return 0;
1297 }
1298
1299 static int is_conditional(struct expression *expr)
1300 {
1301 if (!expr)
1302 return 0;
1303 if (expr->type == EXPR_CONDITIONAL || expr->type == EXPR_SELECT)
1304 return 1;
1305 return 0;
1306 }
1307
1308 static int splitable_function_call(struct expression *expr)
1309 {
1310 struct sm_state *sm;
1311 char buf[64];
1312
1313 if (!expr || expr->type != EXPR_CALL)
1314 return 0;
1315 snprintf(buf, sizeof(buf), "return %p", expr);
1316 sm = get_sm_state(SMATCH_EXTRA, buf, NULL);
1317 return split_possible_helper(sm, expr);
1318 }
1319
1320 static struct sm_state *find_bool_param(void)
1321 {
1322 struct stree *start_states;
1323 struct symbol *arg;
1324 struct sm_state *sm, *tmp;
1325 sval_t sval;
1326
1327 start_states = get_start_states();
1328
1329 FOR_EACH_PTR_REVERSE(cur_func_sym->ctype.base_type->arguments, arg) {
1330 if (!arg->ident)
1331 continue;
1332 sm = get_sm_state_stree(start_states, SMATCH_EXTRA, arg->ident->name, arg);
1333 if (!sm)
1334 continue;
1335 if (rl_min(estate_rl(sm->state)).value != 0 ||
1336 rl_max(estate_rl(sm->state)).value != 1)
1337 continue;
1338 goto found;
1339 } END_FOR_EACH_PTR_REVERSE(arg);
1340
1341 return NULL;
1342
1343 found:
1344 /*
1345 * Check if it's splitable. If not, then splitting it up is likely not
1346 * useful for the callers.
1347 */
1348 FOR_EACH_PTR(sm->possible, tmp) {
1349 if (is_merged(tmp))
1350 continue;
1351 if (!estate_get_single_value(tmp->state, &sval))
1352 return NULL;
1353 } END_FOR_EACH_PTR(tmp);
1354
1355 return sm;
1356 }
1357
1358 static int split_on_bool_sm(struct sm_state *sm, struct expression *expr)
1359 {
1360 struct returned_state_callback *cb;
1361 struct range_list *ret_rl;
1362 const char *return_ranges;
1363 struct sm_state *tmp;
1364 int ret = 0;
1365 int nr_possible, nr_states;
1366 char *compare_str = NULL;
1367 char buf[128];
1368 struct state_list *already_handled = NULL;
1369
1370 if (!sm || !sm->merged)
1371 return 0;
1372
1373 if (too_many_possible(sm))
1374 return 0;
1375
1376 /* bail if it gets too complicated */
1377 nr_possible = ptr_list_size((struct ptr_list *)sm->possible);
1378 nr_states = stree_count(__get_cur_stree());
1379 if (option_info && nr_states * nr_possible >= 2000)
1380 return 0;
1381
1382 FOR_EACH_PTR(sm->possible, tmp) {
1383 if (tmp->merged)
1384 continue;
1385 if (ptr_in_list(tmp, already_handled))
1386 continue;
1387 add_ptr_list(&already_handled, tmp);
1388
1389 ret = 1;
1390 __push_fake_cur_stree();
1391
1392 overwrite_states_using_pool(sm, tmp);
1393
1394 return_ranges = get_return_ranges_str(expr, &ret_rl);
1395 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));
1396 compare_str = expr_lte_to_param(expr, -1);
1397 if (compare_str) {
1398 snprintf(buf, sizeof(buf), "%s%s", return_ranges, compare_str);
1399 return_ranges = alloc_sname(buf);
1400 }
1401
1402 return_id++;
1403 FOR_EACH_PTR(returned_state_callbacks, cb) {
1404 cb->callback(return_id, (char *)return_ranges, expr);
1405 } END_FOR_EACH_PTR(cb);
1406
1407 __free_fake_cur_stree();
1408 } END_FOR_EACH_PTR(tmp);
1409
1410 free_slist(&already_handled);
1411
1412 return ret;
1413 }
1414
1415 static int split_by_bool_param(struct expression *expr)
1416 {
1417 struct sm_state *start_sm, *sm;
1418 sval_t sval;
1419
1420 start_sm = find_bool_param();
1421 if (!start_sm)
1422 return 0;
1423 sm = get_sm_state(SMATCH_EXTRA, start_sm->name, start_sm->sym);
1424 if (!sm || estate_get_single_value(sm->state, &sval))
1425 return 0;
1426 return split_on_bool_sm(sm, expr);
1427 }
1428
1429 static void call_return_state_hooks(struct expression *expr)
1430 {
1431 struct returned_state_callback *cb;
1432 struct range_list *ret_rl;
1433 const char *return_ranges;
1434 int nr_states;
1435 sval_t sval;
1436
1437 if (__path_is_null())
1438 return;
1439
1440 expr = strip_expr(expr);
1441
1442 if (is_impossible_path())
1443 goto vanilla;
1444
1445 if (expr && (expr->type == EXPR_COMPARE ||
1446 !get_implied_value(expr, &sval)) &&
1447 (is_condition(expr) || is_boolean(expr))) {
1448 call_return_state_hooks_compare(expr);
1449 return;
1450 } else if (is_conditional(expr)) {
1451 call_return_state_hooks_conditional(expr);
1452 return;
1453 } else if (call_return_state_hooks_split_possible(expr)) {
1454 return;
1455 } else if (call_return_state_hooks_split_null_non_null(expr)) {
1456 return;
1457 } else if (call_return_state_hooks_split_success_fail(expr)) {
1458 return;
1459 } else if (splitable_function_call(expr)) {
1460 return;
1461 } else if (split_positive_from_negative(expr)) {
1462 return;
1463 } else if (split_by_bool_param(expr)) {
1464 return;
1465 }
1466
1467 vanilla:
1468 return_ranges = get_return_ranges_str(expr, &ret_rl);
1469 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));
1470
1471 return_id++;
1472 nr_states = stree_count(__get_cur_stree());
1473 if (nr_states >= 10000) {
1474 match_return_info(return_id, (char *)return_ranges, expr);
1475 return;
1476 }
1477 FOR_EACH_PTR(returned_state_callbacks, cb) {
1478 cb->callback(return_id, (char *)return_ranges, expr);
1479 } END_FOR_EACH_PTR(cb);
1480 }
1481
1482 static void print_returned_struct_members(int return_id, char *return_ranges, struct expression *expr)
1483 {
1484 struct returned_member_callback *cb;
1485 struct stree *stree;
1486 struct sm_state *sm;
1487 struct symbol *type;
1488 char *name;
1489 char member_name[256];
1490 int len;
1491
1492 type = get_type(expr);
1493 if (!type || type->type != SYM_PTR)
1494 return;
1495 name = expr_to_var(expr);
1496 if (!name)
1497 return;
1498
1499 member_name[sizeof(member_name) - 1] = '\0';
1500 strcpy(member_name, "$");
1501
1502 len = strlen(name);
1503 FOR_EACH_PTR(returned_member_callbacks, cb) {
1504 stree = __get_cur_stree();
1505 FOR_EACH_MY_SM(cb->owner, stree, sm) {
1506 if (sm->name[0] == '*' && strcmp(sm->name + 1, name) == 0) {
1507 strcpy(member_name, "*$");
1508 cb->callback(return_id, return_ranges, expr, member_name, sm->state);
1509 continue;
1510 }
1511 if (strncmp(sm->name, name, len) != 0)
1512 continue;
1513 if (strncmp(sm->name + len, "->", 2) != 0)
1514 continue;
1515 snprintf(member_name, sizeof(member_name), "$%s", sm->name + len);
1516 cb->callback(return_id, return_ranges, expr, member_name, sm->state);
1517 } END_FOR_EACH_SM(sm);
1518 } END_FOR_EACH_PTR(cb);
1519
1520 free_string(name);
1521 }
1522
1523 static void reset_memdb(struct symbol *sym)
1524 {
1525 mem_sql(NULL, NULL, "delete from caller_info;");
1526 mem_sql(NULL, NULL, "delete from return_states;");
1527 mem_sql(NULL, NULL, "delete from call_implies;");
1528 }
1529
1530 static void match_end_func_info(struct symbol *sym)
1531 {
1532 if (__path_is_null())
1533 return;
1534 call_return_state_hooks(NULL);
1535 }
1536
1537 static void match_after_func(struct symbol *sym)
1538 {
1539 if (!__inline_fn)
1540 reset_memdb(sym);
1541 }
1542
1543 static void init_memdb(void)
1544 {
1545 char *err = NULL;
1546 int rc;
1547 const char *schema_files[] = {
1548 "db/db.schema",
1549 "db/caller_info.schema",
1550 "db/return_states.schema",
1551 "db/function_type_size.schema",
1552 "db/type_size.schema",
1553 "db/call_implies.schema",
1554 "db/function_ptr.schema",
1555 "db/local_values.schema",
1556 "db/function_type_value.schema",
1557 "db/type_value.schema",
1558 "db/function_type.schema",
1559 "db/data_info.schema",
1560 };
1561 static char buf[4096];
1562 int fd;
1563 int ret;
1564 int i;
1565
1566 rc = sqlite3_open(":memory:", &mem_db);
1567 if (rc != SQLITE_OK) {
1568 printf("Error starting In-Memory database.");
1569 return;
1570 }
1571
1572 for (i = 0; i < ARRAY_SIZE(schema_files); i++) {
1573 fd = open_data_file(schema_files[i]);
1574 if (fd < 0) {
1575 mem_db = NULL;
1576 return;
1577 }
1578 ret = read(fd, buf, sizeof(buf));
1579 if (ret == sizeof(buf)) {
1580 printf("Schema file too large: %s (limit %zd bytes)",
1581 schema_files[i], sizeof(buf));
1582 }
1583 buf[ret] = '\0';
1584 rc = sqlite3_exec(mem_db, buf, NULL, NULL, &err);
1585 if (rc != SQLITE_OK) {
1586 fprintf(stderr, "SQL error #2: %s\n", err);
1587 fprintf(stderr, "%s\n", buf);
1588 }
1589 }
1590 }
1591
1592 void open_smatch_db(void)
1593 {
1594 int rc;
1595
1596 if (option_no_db)
1597 return;
1598
1599 init_memdb();
1600
1601 rc = sqlite3_open_v2("smatch_db.sqlite", &db, SQLITE_OPEN_READONLY, NULL);
1602 if (rc != SQLITE_OK) {
1603 option_no_db = 1;
1604 return;
1605 }
1606 return;
1607 }
1608
1609 static void register_common_funcs(void)
1610 {
1611 struct token *token;
1612 char *func;
1613 char filename[256];
1614
1615 if (option_project == PROJ_NONE)
1616 strcpy(filename, "common_functions");
1617 else
1618 snprintf(filename, 256, "%s.common_functions", option_project_str);
1619
1620 token = get_tokens_file(filename);
1621 if (!token)
1622 return;
1623 if (token_type(token) != TOKEN_STREAMBEGIN)
1624 return;
1625 token = token->next;
1626 while (token_type(token) != TOKEN_STREAMEND) {
1627 if (token_type(token) != TOKEN_IDENT)
1628 return;
1629 func = alloc_string(show_ident(token->ident));
1630 add_ptr_list(&common_funcs, func);
1631 token = token->next;
1632 }
1633 clear_token_alloc();
1634 }
1635
1636
1637 void register_definition_db_callbacks(int id)
1638 {
1639 add_hook(&match_call_info, FUNCTION_CALL_HOOK);
1640 add_hook(&global_variable, BASE_HOOK);
1641 add_hook(&global_variable, DECLARATION_HOOK);
1642 add_split_return_callback(match_return_info);
1643 add_split_return_callback(print_returned_struct_members);
1644 add_hook(&call_return_state_hooks, RETURN_HOOK);
1645 add_hook(&match_end_func_info, END_FUNC_HOOK);
1646 add_hook(&match_after_func, AFTER_FUNC_HOOK);
1647
1648 add_hook(&match_data_from_db, FUNC_DEF_HOOK);
1649 add_hook(&match_call_implies, CALL_HOOK_AFTER_INLINE);
1650
1651 register_common_funcs();
1652 }
1653
1654 void register_db_call_marker(int id)
1655 {
1656 add_hook(&match_call_marker, FUNCTION_CALL_HOOK);
1657 }
1658
1659 char *return_state_to_var_sym(struct expression *expr, int param, const char *key, struct symbol **sym)
1660 {
1661 struct expression *arg;
1662 char *name = NULL;
1663 char member_name[256];
1664
1665 *sym = NULL;
1666
1667 if (param == -1) {
1668 const char *star = "";
1669
1670 if (expr->type != EXPR_ASSIGNMENT)
1671 return NULL;
1672 name = expr_to_var_sym(expr->left, sym);
1673 if (!name)
1674 return NULL;
1675 if (key[0] == '*') {
1676 star = "*";
1677 key++;
1678 }
1679 if (strncmp(key, "$", 1) != 0)
1680 return name;
1681 snprintf(member_name, sizeof(member_name), "%s%s%s", star, name, key + 1);
1682 free_string(name);
1683 return alloc_string(member_name);
1684 }
1685
1686 while (expr->type == EXPR_ASSIGNMENT)
1687 expr = strip_expr(expr->right);
1688 if (expr->type != EXPR_CALL)
1689 return NULL;
1690
1691 arg = get_argument_from_call_expr(expr->args, param);
1692 if (!arg)
1693 return NULL;
1694
1695 return get_variable_from_key(arg, key, sym);
1696 }
1697
1698 char *get_variable_from_key(struct expression *arg, const char *key, struct symbol **sym)
1699 {
1700 char buf[256];
1701 char *tmp;
1702
1703 if (!arg)
1704 return NULL;
1705
1706 arg = strip_expr(arg);
1707
1708 if (strcmp(key, "$") == 0)
1709 return expr_to_var_sym(arg, sym);
1710
1711 if (strcmp(key, "*$") == 0) {
1712 if (arg->type == EXPR_PREOP && arg->op == '&') {
1713 arg = strip_expr(arg->unop);
1714 return expr_to_var_sym(arg, sym);
1715 } else {
1716 tmp = expr_to_var_sym(arg, sym);
1717 if (!tmp)
1718 return NULL;
1719 snprintf(buf, sizeof(buf), "*%s", tmp);
1720 free_string(tmp);
1721 return alloc_string(buf);
1722 }
1723 }
1724
1725 if (arg->type == EXPR_PREOP && arg->op == '&') {
1726 arg = strip_expr(arg->unop);
1727 tmp = expr_to_var_sym(arg, sym);
1728 if (!tmp)
1729 return NULL;
1730 snprintf(buf, sizeof(buf), "%s.%s", tmp, key + 3);
1731 return alloc_string(buf);
1732 }
1733
1734 tmp = expr_to_var_sym(arg, sym);
1735 if (!tmp)
1736 return NULL;
1737 snprintf(buf, sizeof(buf), "%s%s", tmp, key + 1);
1738 free_string(tmp);
1739 return alloc_string(buf);
1740 }
1741
1742 char *get_chunk_from_key(struct expression *arg, char *key, struct symbol **sym, struct var_sym_list **vsl)
1743 {
1744 *vsl = NULL;
1745
1746 if (strcmp("$", key) == 0)
1747 return expr_to_chunk_sym_vsl(arg, sym, vsl);
1748 return get_variable_from_key(arg, key, sym);
1749 }
1750
1751 const char *get_param_name_var_sym(const char *name, struct symbol *sym)
1752 {
1753 char *param_name;
1754 int name_len;
1755 static char buf[256];
1756
1757 if (!sym || !sym->ident)
1758 return NULL;
1759
1760 param_name = sym->ident->name;
1761 name_len = strlen(param_name);
1762
1763 if (strcmp(name, param_name) == 0) {
1764 return "$";
1765 } else if (name[name_len] == '-' && /* check for '-' from "->" */
1766 strncmp(name, param_name, name_len) == 0) {
1767 snprintf(buf, sizeof(buf), "$%s", name + name_len);
1768 return buf;
1769 } else if (name[0] == '*' && strcmp(name + 1, param_name) == 0) {
1770 return "*$";
1771 }
1772 return NULL;
1773 }
1774
1775 const char *get_param_name(struct sm_state *sm)
1776 {
1777 return get_param_name_var_sym(sm->name, sm->sym);
1778 }
1779
1780 char *get_data_info_name(struct expression *expr)
1781 {
1782 struct symbol *sym;
1783 char *name;
1784 char buf[256];
1785 char *ret = NULL;
1786
1787 expr = strip_expr(expr);
1788 name = get_member_name(expr);
1789 if (name)
1790 return name;
1791 name = expr_to_var_sym(expr, &sym);
1792 if (!name || !sym)
1793 goto free;
1794 if (!(sym->ctype.modifiers & MOD_TOPLEVEL))
1795 goto free;
1796 if (sym->ctype.modifiers & MOD_STATIC)
1797 snprintf(buf, sizeof(buf), "static %s", name);
1798 else
1799 snprintf(buf, sizeof(buf), "global %s", name);
1800 ret = alloc_sname(buf);
1801 free:
1802 free_string(name);
1803 return ret;
1804 }
Static analysis for C