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db: add function_signature to the INTERNAL entries
[smatch.git] / smatch_db.c
blobbee8736880afa9e7b0de7ac959ae022854338dbd
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 (__inline_fn) { \
35 char buf[1024]; \
36 char *err, *p = buf; \
37 int rc; \
38 \
39 if (!mem_db) \
40 break; \
41 \
42 p += snprintf(p, buf + sizeof(buf) - p, \
43 "insert into %s values (", #table); \
44 p += snprintf(p, buf + sizeof(buf) - p, values); \
45 p += snprintf(p, buf + sizeof(buf) - p, ");"); \
46 sm_debug("in-mem: %s\n", buf); \
47 rc = sqlite3_exec(mem_db, buf, NULL, NULL, &err); \
48 if (rc != SQLITE_OK) { \
49 fprintf(stderr, "SQL error #2: %s\n", err); \
50 fprintf(stderr, "SQL: '%s'\n", buf); \
51 parse_error = 1; \
52 } \
53 break; \
54 } \
55 if (option_info) { \
56 sm_prefix(); \
57 sm_printf("SQL: insert into " #table " values (" values); \
58 sm_printf(");\n"); \
59 } \
60 } while (0)
61
62 struct def_callback {
63 int hook_type;
64 void (*callback)(const char *name, struct symbol *sym, char *key, char *value);
65 };
66 ALLOCATOR(def_callback, "definition db hook callbacks");
67 DECLARE_PTR_LIST(callback_list, struct def_callback);
68 static struct callback_list *select_caller_info_callbacks;
69
70 struct member_info_callback {
71 int owner;
72 void (*callback)(struct expression *call, int param, char *printed_name, struct sm_state *sm);
73 };
74 ALLOCATOR(member_info_callback, "caller_info callbacks");
75 DECLARE_PTR_LIST(member_info_cb_list, struct member_info_callback);
76 static struct member_info_cb_list *member_callbacks;
77
78 struct returned_state_callback {
79 void (*callback)(int return_id, char *return_ranges, struct expression *return_expr);
80 };
81 ALLOCATOR(returned_state_callback, "returned state callbacks");
82 DECLARE_PTR_LIST(returned_state_cb_list, struct returned_state_callback);
83 static struct returned_state_cb_list *returned_state_callbacks;
84
85 struct returned_member_callback {
86 int owner;
87 void (*callback)(int return_id, char *return_ranges, struct expression *expr, char *printed_name, struct smatch_state *state);
88 };
89 ALLOCATOR(returned_member_callback, "returned member callbacks");
90 DECLARE_PTR_LIST(returned_member_cb_list, struct returned_member_callback);
91 static struct returned_member_cb_list *returned_member_callbacks;
92
93 struct call_implies_callback {
94 int type;
95 void (*callback)(struct expression *arg, char *key, char *value);
96 };
97 ALLOCATOR(call_implies_callback, "call_implies callbacks");
98 DECLARE_PTR_LIST(call_implies_cb_list, struct call_implies_callback);
99 static struct call_implies_cb_list *call_implies_cb_list;
100
101 static int print_sql_output(void *unused, int argc, char **argv, char **azColName)
102 {
103 int i;
104
105 for (i = 0; i < argc; i++) {
106 if (i != 0)
107 printf(", ");
108 sm_printf("%s", argv[i]);
109 }
110 sm_printf("\n");
111 return 0;
112 }
113
114 void debug_sql(const char *sql)
115 {
116 if (!option_debug)
117 return;
118 sm_msg("%s", sql);
119 sql_exec(print_sql_output, NULL, sql);
120 }
121
122 void debug_mem_sql(const char *sql)
123 {
124 if (!option_debug)
125 return;
126 sm_msg("%s", sql);
127 sql_mem_exec(print_sql_output, NULL, sql);
128 }
129
130 void sql_exec(int (*callback)(void*, int, char**, char**), void *data, const char *sql)
131 {
132 char *err = NULL;
133 int rc;
134
135 if (option_no_db || !db)
136 return;
137
138 rc = sqlite3_exec(db, sql, callback, data, &err);
139 if (rc != SQLITE_OK && !parse_error) {
140 fprintf(stderr, "SQL error #2: %s\n", err);
141 fprintf(stderr, "SQL: '%s'\n", sql);
142 parse_error = 1;
143 }
144 }
145
146 void sql_mem_exec(int (*callback)(void*, int, char**, char**), void *data, const char *sql)
147 {
148 char *err = NULL;
149 int rc;
150
151 if (!mem_db)
152 return;
153
154 rc = sqlite3_exec(mem_db, sql, callback, data, &err);
155 if (rc != SQLITE_OK) {
156 fprintf(stderr, "SQL error #2: %s\n", err);
157 fprintf(stderr, "SQL: '%s'\n", sql);
158 parse_error = 1;
159 }
160 }
161
162 static int replace_count;
163 static char **replace_table;
164 static const char *replace_return_ranges(const char *return_ranges)
165 {
166 int i;
167
168 if (!get_function()) {
169 /* I have no idea why EXPORT_SYMBOL() is here */
170 return return_ranges;
171 }
172 for (i = 0; i < replace_count; i += 3) {
173 if (strcmp(replace_table[i + 0], get_function()) == 0) {
174 if (strcmp(replace_table[i + 1], return_ranges) == 0)
175 return replace_table[i + 2];
176 }
177 }
178 return return_ranges;
179 }
180
181 void sql_insert_return_states(int return_id, const char *return_ranges,
182 int type, int param, const char *key, const char *value)
183 {
184 if (key && strlen(key) >= 80)
185 return;
186 return_ranges = replace_return_ranges(return_ranges);
187 sql_insert(return_states, "'%s', '%s', %lu, %d, '%s', %d, %d, %d, '%s', '%s'",
188 get_base_file(), get_function(), (unsigned long)__inline_fn,
189 return_id, return_ranges, fn_static(), type, param, key, value);
190 }
191
192 static struct string_list *common_funcs;
193 static int is_common_function(const char *fn)
194 {
195 char *tmp;
196
197 if (strncmp(fn, "__builtin_", 10) == 0)
198 return 1;
199
200 FOR_EACH_PTR(common_funcs, tmp) {
201 if (strcmp(tmp, fn) == 0)
202 return 1;
203 } END_FOR_EACH_PTR(tmp);
204
205 return 0;
206 }
207
208 static char *function_signature(void)
209 {
210 return type_to_str(get_real_base_type(cur_func_sym));
211 }
212
213 void sql_insert_caller_info(struct expression *call, int type,
214 int param, const char *key, const char *value)
215 {
216 char *fn;
217
218 if (!option_info && !__inline_call)
219 return;
220
221 if (key && strlen(key) >= 80)
222 return;
223
224 fn = get_fnptr_name(call->fn);
225 if (!fn)
226 return;
227
228 if (__inline_call) {
229 mem_sql(NULL, NULL,
230 "insert into caller_info values ('%s', '%s', '%s', %lu, %d, %d, %d, '%s', '%s');",
231 get_base_file(), get_function(), fn, (unsigned long)call,
232 is_static(call->fn), type, param, key, value);
233 }
234
235 if (!option_info)
236 return;
237
238 if (is_common_function(fn))
239 return;
240
241 sm_msg("SQL_caller_info: insert into caller_info values ("
242 "'%s', '%s', '%s', %%CALL_ID%%, %d, %d, %d, '%s', '%s');",
243 get_base_file(), get_function(), fn, is_static(call->fn),
244 type, param, key, value);
245
246 free_string(fn);
247 }
248
249 void sql_insert_function_ptr(const char *fn, const char *struct_name)
250 {
251 sql_insert(function_ptr, "'%s', '%s', '%s', 0", get_base_file(), fn,
252 struct_name);
253 }
254
255 void sql_insert_call_implies(int type, int param, const char *key, const char *value)
256 {
257 sql_insert(call_implies, "'%s', '%s', %lu, %d, %d, %d, '%s', %s", get_base_file(),
258 get_function(), (unsigned long)__inline_fn, fn_static(),
259 type, param, key, value);
260 }
261
262 void sql_insert_function_type_size(const char *member, const char *ranges)
263 {
264 sql_insert(function_type_size, "'%s', '%s', '%s', '%s'", get_base_file(), get_function(), member, ranges);
265 }
266
267 void sql_insert_local_values(const char *name, const char *value)
268 {
269 sql_insert(local_values, "'%s', '%s', '%s'", get_base_file(), name, value);
270 }
271
272 void sql_insert_function_type_value(const char *type, const char *value)
273 {
274 sql_insert(function_type_value, "'%s', '%s', '%s', '%s'", get_base_file(), get_function(), type, value);
275 }
276
277 void sql_insert_function_type(int param, const char *value)
278 {
279 sql_insert(function_type, "'%s', '%s', %d, %d, '%s'",
280 get_base_file(), get_function(), fn_static(), param, value);
281 }
282
283 void sql_insert_parameter_name(int param, const char *value)
284 {
285 sql_insert(parameter_name, "'%s', '%s', %d, %d, '%s'",
286 get_base_file(), get_function(), fn_static(), param, value);
287 }
288
289 void sql_insert_data_info(struct expression *data, int type, const char *value)
290 {
291 char *data_name;
292
293 data_name = get_data_info_name(data);
294 if (!data_name)
295 return;
296 sql_insert(data_info, "'%s', '%s', %d, '%s'",
297 is_static(data) ? get_base_file() : "extern",
298 data_name, type, value);
299 }
300
301 void sql_insert_data_info_var_sym(const char *var, struct symbol *sym, int type, const char *value)
302 {
303 sql_insert(data_info, "'%s', '%s', %d, '%s'",
304 (sym->ctype.modifiers & MOD_STATIC) ? get_base_file() : "extern",
305 var, type, value);
306 }
307
308 char *get_static_filter(struct symbol *sym)
309 {
310 static char sql_filter[1024];
311
312 /* This can only happen on buggy code. Return invalid SQL. */
313 if (!sym) {
314 sql_filter[0] = '\0';
315 return sql_filter;
316 }
317
318 if (sym->ctype.modifiers & MOD_STATIC) {
319 snprintf(sql_filter, sizeof(sql_filter),
320 "file = '%s' and function = '%s' and static = '1'",
321 get_base_file(), sym->ident->name);
322 } else {
323 snprintf(sql_filter, sizeof(sql_filter),
324 "function = '%s' and static = '0'", sym->ident->name);
325 }
326
327 return sql_filter;
328 }
329
330 static int get_row_count(void *_row_count, int argc, char **argv, char **azColName)
331 {
332 int *row_count = _row_count;
333
334 *row_count = 0;
335 if (argc != 1)
336 return 0;
337 *row_count = atoi(argv[0]);
338 return 0;
339 }
340
341 static void sql_select_return_states_pointer(const char *cols,
342 struct expression *call, int (*callback)(void*, int, char**, char**), void *info)
343 {
344 char *ptr;
345 int return_count = 0;
346
347 ptr = get_fnptr_name(call->fn);
348 if (!ptr)
349 return;
350
351 run_sql(get_row_count, &return_count,
352 "select count(*) from return_states join function_ptr "
353 "where return_states.function == function_ptr.function and "
354 "ptr = '%s' and searchable = 1 and type = %d;", ptr, INTERNAL);
355 /* The magic number 100 is just from testing on the kernel. */
356 if (return_count > 100)
357 return;
358
359 run_sql(callback, info,
360 "select %s from return_states join function_ptr where "
361 "return_states.function == function_ptr.function and ptr = '%s' "
362 "and searchable = 1 "
363 "order by function_ptr.file, return_states.file, return_id, type;",
364 cols, ptr);
365 }
366
367 static int is_local_symbol(struct expression *expr)
368 {
369 if (expr->type != EXPR_SYMBOL)
370 return 0;
371 if (expr->symbol->ctype.modifiers & (MOD_NONLOCAL | MOD_STATIC | MOD_ADDRESSABLE))
372 return 0;
373 return 1;
374 }
375
376 void sql_select_return_states(const char *cols, struct expression *call,
377 int (*callback)(void*, int, char**, char**), void *info)
378 {
379 int row_count = 0;
380
381 if (is_fake_call(call))
382 return;
383
384 if (call->fn->type != EXPR_SYMBOL || !call->fn->symbol || is_local_symbol(call->fn)) {
385 sql_select_return_states_pointer(cols, call, callback, info);
386 return;
387 }
388
389 if (inlinable(call->fn)) {
390 mem_sql(callback, info,
391 "select %s from return_states where call_id = '%lu' order by return_id, type;",
392 cols, (unsigned long)call);
393 return;
394 }
395
396 run_sql(get_row_count, &row_count, "select count(*) from return_states where %s;",
397 get_static_filter(call->fn->symbol));
398 if (row_count > 3000)
399 return;
400
401 run_sql(callback, info, "select %s from return_states where %s order by file, return_id, type;",
402 cols, get_static_filter(call->fn->symbol));
403 }
404
405 void sql_select_call_implies(const char *cols, struct expression *call,
406 int (*callback)(void*, int, char**, char**))
407 {
408 if (call->fn->type != EXPR_SYMBOL || !call->fn->symbol)
409 return;
410
411 if (inlinable(call->fn)) {
412 mem_sql(callback, call,
413 "select %s from call_implies where call_id = '%lu';",
414 cols, (unsigned long)call);
415 return;
416 }
417
418 run_sql(callback, call, "select %s from call_implies where %s;",
419 cols, get_static_filter(call->fn->symbol));
420 }
421
422 struct select_caller_info_data {
423 struct stree *final_states;
424 int prev_func_id;
425 int ignore;
426 };
427
428 static void sql_select_caller_info(struct select_caller_info_data *data,
429 const char *cols, struct symbol *sym,
430 int (*callback)(void*, int, char**, char**))
431 {
432 if (__inline_fn) {
433 mem_sql(callback, data,
434 "select %s from caller_info where call_id = %lu;",
435 cols, (unsigned long)__inline_fn);
436 return;
437 }
438
439 run_sql(callback, data,
440 "select %s from caller_info where %s order by call_id;",
441 cols, get_static_filter(sym));
442 }
443
444 void select_caller_info_hook(void (*callback)(const char *name, struct symbol *sym, char *key, char *value), int type)
445 {
446 struct def_callback *def_callback = __alloc_def_callback(0);
447
448 def_callback->hook_type = type;
449 def_callback->callback = callback;
450 add_ptr_list(&select_caller_info_callbacks, def_callback);
451 }
452
453 /*
454 * These call backs are used when the --info option is turned on to print struct
455 * member information. For example foo->bar could have a state in
456 * smatch_extra.c and also check_user.c.
457 */
458 void add_member_info_callback(int owner, void (*callback)(struct expression *call, int param, char *printed_name, struct sm_state *sm))
459 {
460 struct member_info_callback *member_callback = __alloc_member_info_callback(0);
461
462 member_callback->owner = owner;
463 member_callback->callback = callback;
464 add_ptr_list(&member_callbacks, member_callback);
465 }
466
467 void add_split_return_callback(void (*fn)(int return_id, char *return_ranges, struct expression *returned_expr))
468 {
469 struct returned_state_callback *callback = __alloc_returned_state_callback(0);
470
471 callback->callback = fn;
472 add_ptr_list(&returned_state_callbacks, callback);
473 }
474
475 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))
476 {
477 struct returned_member_callback *member_callback = __alloc_returned_member_callback(0);
478
479 member_callback->owner = owner;
480 member_callback->callback = callback;
481 add_ptr_list(&returned_member_callbacks, member_callback);
482 }
483
484 void select_call_implies_hook(int type, void (*callback)(struct expression *arg, char *key, char *value))
485 {
486 struct call_implies_callback *cb = __alloc_call_implies_callback(0);
487
488 cb->type = type;
489 cb->callback = callback;
490 add_ptr_list(&call_implies_cb_list, cb);
491 }
492
493 struct return_info {
494 struct expression *static_returns_call;
495 struct symbol *return_type;
496 struct range_list *return_range_list;
497 };
498
499 static int db_return_callback(void *_ret_info, int argc, char **argv, char **azColName)
500 {
501 struct return_info *ret_info = _ret_info;
502 struct range_list *rl;
503 struct expression *call_expr = ret_info->static_returns_call;
504
505 if (argc != 1)
506 return 0;
507 call_results_to_rl(call_expr, ret_info->return_type, argv[0], &rl);
508 ret_info->return_range_list = rl_union(ret_info->return_range_list, rl);
509 return 0;
510 }
511
512 struct range_list *db_return_vals(struct expression *expr)
513 {
514 struct return_info ret_info = {};
515 char buf[64];
516 struct sm_state *sm;
517
518 if (is_fake_call(expr))
519 return NULL;
520
521 snprintf(buf, sizeof(buf), "return %p", expr);
522 sm = get_sm_state(SMATCH_EXTRA, buf, NULL);
523 if (sm)
524 return clone_rl(estate_rl(sm->state));
525 ret_info.static_returns_call = expr;
526 ret_info.return_type = get_type(expr);
527 if (!ret_info.return_type)
528 return NULL;
529
530 if (expr->fn->type != EXPR_SYMBOL || !expr->fn->symbol)
531 return NULL;
532
533 ret_info.return_range_list = NULL;
534 if (inlinable(expr->fn)) {
535 mem_sql(db_return_callback, &ret_info,
536 "select distinct return from return_states where call_id = '%lu';",
537 (unsigned long)expr);
538 } else {
539 run_sql(db_return_callback, &ret_info,
540 "select distinct return from return_states where %s;",
541 get_static_filter(expr->fn->symbol));
542 }
543 return ret_info.return_range_list;
544 }
545
546 struct range_list *db_return_vals_from_str(const char *fn_name)
547 {
548 struct return_info ret_info;
549
550 ret_info.static_returns_call = NULL;
551 ret_info.return_type = &llong_ctype;
552 ret_info.return_range_list = NULL;
553
554 run_sql(db_return_callback, &ret_info,
555 "select distinct return from return_states where function = '%s';",
556 fn_name);
557 return ret_info.return_range_list;
558 }
559
560 static void match_call_marker(struct expression *expr)
561 {
562 struct symbol *type;
563
564 type = get_type(expr->fn);
565
566 /*
567 * we just want to record something in the database so that if we have
568 * two calls like: frob(4); frob(some_unkown); then on the receiving
569 * side we know that sometimes frob is called with unknown parameters.
570 */
571
572 sql_insert_caller_info(expr, INTERNAL, -1, "%call_marker%", type_to_str(type));
573 }
574
575 static void print_struct_members(struct expression *call, struct expression *expr, int param, struct stree *stree,
576 void (*callback)(struct expression *call, int param, char *printed_name, struct sm_state *sm))
577 {
578 struct sm_state *sm;
579 char *name;
580 struct symbol *sym;
581 int len;
582 char printed_name[256];
583 int is_address = 0;
584
585 expr = strip_expr(expr);
586 if (expr->type == EXPR_PREOP && expr->op == '&') {
587 expr = strip_expr(expr->unop);
588 is_address = 1;
589 }
590
591 name = expr_to_var_sym(expr, &sym);
592 if (!name || !sym)
593 goto free;
594
595 len = strlen(name);
596 FOR_EACH_SM(stree, sm) {
597 if (sm->sym != sym)
598 continue;
599 if (strcmp(name, sm->name) == 0) {
600 if (is_address)
601 snprintf(printed_name, sizeof(printed_name), "*$");
602 else /* these are already handled. fixme: handle them here */
603 continue;
604 } else if (sm->name[0] == '*' && strcmp(name, sm->name + 1) == 0) {
605 snprintf(printed_name, sizeof(printed_name), "*$");
606 } else if (strncmp(name, sm->name, len) == 0) {
607 if (isalnum(sm->name[len]))
608 continue;
609 if (is_address)
610 snprintf(printed_name, sizeof(printed_name), "$->%s", sm->name + len + 1);
611 else
612 snprintf(printed_name, sizeof(printed_name), "$%s", sm->name + len);
613 } else {
614 continue;
615 }
616 callback(call, param, printed_name, sm);
617 } END_FOR_EACH_SM(sm);
618 free:
619 free_string(name);
620 }
621
622 static void match_call_info(struct expression *call)
623 {
624 struct member_info_callback *cb;
625 struct expression *arg;
626 struct stree *stree;
627 char *name;
628 int i;
629
630 name = get_fnptr_name(call->fn);
631 if (!name)
632 return;
633
634 FOR_EACH_PTR(member_callbacks, cb) {
635 stree = get_all_states_stree(cb->owner);
636 i = 0;
637 FOR_EACH_PTR(call->args, arg) {
638 print_struct_members(call, arg, i, stree, cb->callback);
639 i++;
640 } END_FOR_EACH_PTR(arg);
641 free_stree(&stree);
642 } END_FOR_EACH_PTR(cb);
643
644 free_string(name);
645 }
646
647 static int get_param(int param, char **name, struct symbol **sym)
648 {
649 struct symbol *arg;
650 int i;
651
652 i = 0;
653 FOR_EACH_PTR(cur_func_sym->ctype.base_type->arguments, arg) {
654 /*
655 * this is a temporary hack to work around a bug (I think in sparse?)
656 * 2.6.37-rc1:fs/reiserfs/journal.o
657 * If there is a function definition without parameter name found
658 * after a function implementation then it causes a crash.
659 * int foo() {}
660 * int bar(char *);
661 */
662 if (arg->ident->name < (char *)100)
663 continue;
664 if (i == param) {
665 *name = arg->ident->name;
666 *sym = arg;
667 return TRUE;
668 }
669 i++;
670 } END_FOR_EACH_PTR(arg);
671
672 return FALSE;
673 }
674
675 static int function_signature_matches(const char *sig)
676 {
677 char *my_sig;
678
679 my_sig = function_signature();
680 if (!sig || !my_sig)
681 return 1; /* default to matching */
682 if (strcmp(my_sig, sig) == 0)
683 return 1;
684 return 0;
685 }
686
687 static int caller_info_callback(void *_data, int argc, char **argv, char **azColName)
688 {
689 struct select_caller_info_data *data = _data;
690 int func_id;
691 long type;
692 long param;
693 char *key;
694 char *value;
695 char *name = NULL;
696 struct symbol *sym = NULL;
697 struct def_callback *def_callback;
698 struct stree *stree;
699
700 if (argc != 5)
701 return 0;
702
703 func_id = atoi(argv[0]);
704 errno = 0;
705 type = strtol(argv[1], NULL, 10);
706 param = strtol(argv[2], NULL, 10);
707 if (errno)
708 return 0;
709 key = argv[3];
710 value = argv[4];
711
712 if (data->prev_func_id == -1)
713 data->prev_func_id = func_id;
714 if (type == INTERNAL &&
715 !function_signature_matches(value))
716 data->ignore = 1;
717 if (func_id != data->prev_func_id) {
718 stree = __pop_fake_cur_stree();
719 if (!data->ignore)
720 merge_stree(&data->final_states, stree);
721 free_stree(&stree);
722 __push_fake_cur_stree();
723 __unnullify_path();
724 data->prev_func_id = func_id;
725 data->ignore = 0;
726 }
727
728 if (data->ignore)
729 return 0;
730 if (param >= 0 && !get_param(param, &name, &sym))
731 return 0;
732
733 FOR_EACH_PTR(select_caller_info_callbacks, def_callback) {
734 if (def_callback->hook_type == type)
735 def_callback->callback(name, sym, key, value);
736 } END_FOR_EACH_PTR(def_callback);
737
738 return 0;
739 }
740
741 static void get_direct_callers(struct select_caller_info_data *data, struct symbol *sym)
742 {
743 sql_select_caller_info(data,
744 "call_id, type, parameter, key, value", sym,
745 caller_info_callback);
746 }
747
748 static struct string_list *ptr_names_done;
749 static struct string_list *ptr_names;
750
751 static int get_ptr_name(void *unused, int argc, char **argv, char **azColName)
752 {
753 insert_string(&ptr_names, alloc_string(argv[0]));
754 return 0;
755 }
756
757 static char *get_next_ptr_name(void)
758 {
759 char *ptr;
760
761 FOR_EACH_PTR(ptr_names, ptr) {
762 if (list_has_string(ptr_names_done, ptr))
763 continue;
764 insert_string(&ptr_names_done, ptr);
765 return ptr;
766 } END_FOR_EACH_PTR(ptr);
767 return NULL;
768 }
769
770 static void get_ptr_names(const char *file, const char *name)
771 {
772 char sql_filter[1024];
773 int before, after;
774
775 if (file) {
776 snprintf(sql_filter, 1024, "file = '%s' and function = '%s';",
777 file, name);
778 } else {
779 snprintf(sql_filter, 1024, "function = '%s';", name);
780 }
781
782 before = ptr_list_size((struct ptr_list *)ptr_names);
783
784 run_sql(get_ptr_name, NULL,
785 "select distinct ptr from function_ptr where %s",
786 sql_filter);
787
788 after = ptr_list_size((struct ptr_list *)ptr_names);
789 if (before == after)
790 return;
791
792 while ((name = get_next_ptr_name()))
793 get_ptr_names(NULL, name);
794 }
795
796 static void match_data_from_db(struct symbol *sym)
797 {
798 struct select_caller_info_data data = { .prev_func_id = -1 };
799 struct sm_state *sm;
800 struct stree *stree;
801
802 if (!sym || !sym->ident)
803 return;
804
805 __push_fake_cur_stree();
806 __unnullify_path();
807
808 if (!__inline_fn) {
809 char *ptr;
810
811 if (sym->ctype.modifiers & MOD_STATIC)
812 get_ptr_names(get_base_file(), sym->ident->name);
813 else
814 get_ptr_names(NULL, sym->ident->name);
815
816 if (ptr_list_size((struct ptr_list *)ptr_names) > 20) {
817 __free_ptr_list((struct ptr_list **)&ptr_names);
818 __free_ptr_list((struct ptr_list **)&ptr_names_done);
819 stree = __pop_fake_cur_stree();
820 free_stree(&stree);
821 return;
822 }
823
824 get_direct_callers(&data, sym);
825
826 FOR_EACH_PTR(ptr_names, ptr) {
827 run_sql(caller_info_callback, &data,
828 "select call_id, type, parameter, key, value"
829 " from caller_info where function = '%s' order by call_id",
830 ptr);
831 free_string(ptr);
832 } END_FOR_EACH_PTR(ptr);
833
834 __free_ptr_list((struct ptr_list **)&ptr_names);
835 __free_ptr_list((struct ptr_list **)&ptr_names_done);
836 } else {
837 get_direct_callers(&data, sym);
838 }
839
840 stree = __pop_fake_cur_stree();
841 merge_stree(&data.final_states, stree);
842 free_stree(&stree);
843
844 FOR_EACH_SM(data.final_states, sm) {
845 __set_sm(sm);
846 } END_FOR_EACH_SM(sm);
847
848 free_stree(&data.final_states);
849 }
850
851 static int call_implies_callbacks(void *_call, int argc, char **argv, char **azColName)
852 {
853 struct expression *call_expr = _call;
854 struct call_implies_callback *cb;
855 struct expression *arg = NULL;
856 int type;
857 int param;
858
859 if (argc != 5)
860 return 0;
861
862 type = atoi(argv[1]);
863 param = atoi(argv[2]);
864
865 FOR_EACH_PTR(call_implies_cb_list, cb) {
866 if (cb->type != type)
867 continue;
868 if (param != -1) {
869 arg = get_argument_from_call_expr(call_expr->args, param);
870 if (!arg)
871 continue;
872 }
873 cb->callback(arg, argv[3], argv[4]);
874 } END_FOR_EACH_PTR(cb);
875
876 return 0;
877 }
878
879 static void match_call_implies(struct expression *expr)
880 {
881 sql_select_call_implies("function, type, parameter, key, value", expr,
882 call_implies_callbacks);
883 }
884
885 static void print_initializer_list(struct expression_list *expr_list,
886 struct symbol *struct_type)
887 {
888 struct expression *expr;
889 struct symbol *base_type;
890 char struct_name[256];
891
892 FOR_EACH_PTR(expr_list, expr) {
893 if (expr->type == EXPR_INDEX && expr->idx_expression && expr->idx_expression->type == EXPR_INITIALIZER) {
894 print_initializer_list(expr->idx_expression->expr_list, struct_type);
895 continue;
896 }
897 if (expr->type != EXPR_IDENTIFIER)
898 continue;
899 if (!expr->expr_ident)
900 continue;
901 if (!expr->ident_expression || !expr->ident_expression->symbol_name)
902 continue;
903 base_type = get_type(expr->ident_expression);
904 if (!base_type || base_type->type != SYM_FN)
905 continue;
906 snprintf(struct_name, sizeof(struct_name), "(struct %s)->%s",
907 struct_type->ident->name, expr->expr_ident->name);
908 sql_insert_function_ptr(expr->ident_expression->symbol_name->name,
909 struct_name);
910 } END_FOR_EACH_PTR(expr);
911 }
912
913 static void global_variable(struct symbol *sym)
914 {
915 struct symbol *struct_type;
916
917 if (!sym->ident)
918 return;
919 if (!sym->initializer || sym->initializer->type != EXPR_INITIALIZER)
920 return;
921 struct_type = get_base_type(sym);
922 if (!struct_type)
923 return;
924 if (struct_type->type == SYM_ARRAY) {
925 struct_type = get_base_type(struct_type);
926 if (!struct_type)
927 return;
928 }
929 if (struct_type->type != SYM_STRUCT || !struct_type->ident)
930 return;
931 print_initializer_list(sym->initializer->expr_list, struct_type);
932 }
933
934 static void match_return_info(int return_id, char *return_ranges, struct expression *expr)
935 {
936 sql_insert_return_states(return_id, return_ranges, INTERNAL, -1, "", function_signature());
937 }
938
939 static void call_return_state_hooks_conditional(struct expression *expr)
940 {
941 struct returned_state_callback *cb;
942 struct range_list *rl;
943 char *return_ranges;
944 int final_pass_orig = final_pass;
945
946 __push_fake_cur_stree();
947
948 final_pass = 0;
949 __split_whole_condition(expr->conditional);
950 final_pass = final_pass_orig;
951
952 if (get_implied_rl(expr->cond_true, &rl))
953 rl = cast_rl(cur_func_return_type(), rl);
954 else
955 rl = cast_rl(cur_func_return_type(), alloc_whole_rl(get_type(expr->cond_true)));
956 return_ranges = show_rl(rl);
957 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(rl));
958
959 return_id++;
960 FOR_EACH_PTR(returned_state_callbacks, cb) {
961 cb->callback(return_id, return_ranges, expr);
962 } END_FOR_EACH_PTR(cb);
963
964 __push_true_states();
965 __use_false_states();
966
967 if (get_implied_rl(expr->cond_false, &rl))
968 rl = cast_rl(cur_func_return_type(), rl);
969 else
970 rl = cast_rl(cur_func_return_type(), alloc_whole_rl(get_type(expr->cond_false)));
971 return_ranges = show_rl(rl);
972 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(rl));
973
974 return_id++;
975 FOR_EACH_PTR(returned_state_callbacks, cb) {
976 cb->callback(return_id, return_ranges, expr);
977 } END_FOR_EACH_PTR(cb);
978
979 __merge_true_states();
980 __free_fake_cur_stree();
981 }
982
983 static void call_return_state_hooks_compare(struct expression *expr)
984 {
985 struct returned_state_callback *cb;
986 char *return_ranges;
987 int final_pass_orig = final_pass;
988 sval_t sval = { .type = &int_ctype };
989 sval_t ret;
990
991 if (!get_implied_value(expr, &ret))
992 ret.value = -1;
993
994 __push_fake_cur_stree();
995
996 final_pass = 0;
997 __split_whole_condition(expr);
998 final_pass = final_pass_orig;
999
1000 if (ret.value != 0) {
1001 return_ranges = alloc_sname("1");
1002 sval.value = 1;
1003 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_sval(sval));
1004
1005 return_id++;
1006 FOR_EACH_PTR(returned_state_callbacks, cb) {
1007 cb->callback(return_id, return_ranges, expr);
1008 } END_FOR_EACH_PTR(cb);
1009 }
1010
1011 __push_true_states();
1012 __use_false_states();
1013
1014 if (ret.value != 1) {
1015 return_ranges = alloc_sname("0");
1016 sval.value = 0;
1017 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_sval(sval));
1018
1019 return_id++;
1020 FOR_EACH_PTR(returned_state_callbacks, cb) {
1021 cb->callback(return_id, return_ranges, expr);
1022 } END_FOR_EACH_PTR(cb);
1023 }
1024
1025 __merge_true_states();
1026 __free_fake_cur_stree();
1027 }
1028
1029 static int ptr_in_list(struct sm_state *sm, struct state_list *slist)
1030 {
1031 struct sm_state *tmp;
1032
1033 FOR_EACH_PTR(slist, tmp) {
1034 if (strcmp(tmp->state->name, sm->state->name) == 0)
1035 return 1;
1036 } END_FOR_EACH_PTR(tmp);
1037
1038 return 0;
1039 }
1040
1041 static char *get_return_compare_str(struct expression *expr)
1042 {
1043 char *compare_str;
1044 char *var;
1045 char buf[256];
1046 int comparison;
1047 int param;
1048
1049 compare_str = expr_lte_to_param(expr, -1);
1050 if (compare_str)
1051 return compare_str;
1052 param = get_param_num(expr);
1053 if (param < 0)
1054 return NULL;
1055
1056 var = expr_to_var(expr);
1057 if (!var)
1058 return NULL;
1059 snprintf(buf, sizeof(buf), "%s orig", var);
1060 comparison = get_comparison_strings(var, buf);
1061 free_string(var);
1062
1063 if (!comparison)
1064 return NULL;
1065
1066 snprintf(buf, sizeof(buf), "[%s$%d]", show_special(comparison), param);
1067 return alloc_sname(buf);
1068 }
1069
1070 static int split_possible_helper(struct sm_state *sm, struct expression *expr)
1071 {
1072 struct returned_state_callback *cb;
1073 struct range_list *rl;
1074 char *return_ranges;
1075 struct sm_state *tmp;
1076 int ret = 0;
1077 int nr_possible, nr_states;
1078 char *compare_str = NULL;
1079 char buf[128];
1080 struct state_list *already_handled = NULL;
1081
1082 if (!sm || !sm->merged)
1083 return 0;
1084
1085 if (too_many_possible(sm))
1086 return 0;
1087
1088 /* bail if it gets too complicated */
1089 nr_possible = ptr_list_size((struct ptr_list *)sm->possible);
1090 nr_states = stree_count(__get_cur_stree());
1091 if (nr_states * nr_possible >= 2000)
1092 return 0;
1093
1094 FOR_EACH_PTR(sm->possible, tmp) {
1095 if (tmp->merged)
1096 continue;
1097 if (ptr_in_list(tmp, already_handled))
1098 continue;
1099 add_ptr_list(&already_handled, tmp);
1100
1101 ret = 1;
1102 __push_fake_cur_stree();
1103
1104 overwrite_states_using_pool(sm, tmp);
1105
1106 rl = cast_rl(cur_func_return_type(), estate_rl(tmp->state));
1107 return_ranges = show_rl(rl);
1108 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(clone_rl(rl)));
1109 compare_str = get_return_compare_str(expr);
1110 if (compare_str) {
1111 snprintf(buf, sizeof(buf), "%s%s", return_ranges, compare_str);
1112 return_ranges = alloc_sname(buf);
1113 }
1114
1115 return_id++;
1116 FOR_EACH_PTR(returned_state_callbacks, cb) {
1117 cb->callback(return_id, return_ranges, expr);
1118 } END_FOR_EACH_PTR(cb);
1119
1120 __free_fake_cur_stree();
1121 } END_FOR_EACH_PTR(tmp);
1122
1123 free_slist(&already_handled);
1124
1125 return ret;
1126 }
1127
1128 static int call_return_state_hooks_split_possible(struct expression *expr)
1129 {
1130 struct sm_state *sm;
1131
1132 if (!expr || expr_equal_to_param(expr, -1))
1133 return 0;
1134
1135 sm = get_sm_state_expr(SMATCH_EXTRA, expr);
1136 return split_possible_helper(sm, expr);
1137 }
1138
1139 static const char *get_return_ranges_str(struct expression *expr, struct range_list **rl_p)
1140 {
1141 struct range_list *rl;
1142 char *return_ranges;
1143 sval_t sval;
1144 char *compare_str;
1145 char *math_str;
1146 char buf[128];
1147
1148 *rl_p = NULL;
1149
1150 if (!expr)
1151 return alloc_sname("");
1152
1153 if (get_implied_value(expr, &sval)) {
1154 sval = sval_cast(cur_func_return_type(), sval);
1155 *rl_p = alloc_rl(sval, sval);
1156 return sval_to_str(sval);
1157 }
1158
1159 compare_str = expr_equal_to_param(expr, -1);
1160 math_str = get_value_in_terms_of_parameter_math(expr);
1161
1162 if (get_implied_rl(expr, &rl)) {
1163 rl = cast_rl(cur_func_return_type(), rl);
1164 return_ranges = show_rl(rl);
1165 } else if (get_imaginary_absolute(expr, &rl)){
1166 rl = cast_rl(cur_func_return_type(), rl);
1167 return alloc_sname(show_rl(rl));
1168 } else {
1169 rl = cast_rl(cur_func_return_type(), alloc_whole_rl(get_type(expr)));
1170 return_ranges = show_rl(rl);
1171 }
1172 *rl_p = rl;
1173
1174 if (compare_str) {
1175 snprintf(buf, sizeof(buf), "%s%s", return_ranges, compare_str);
1176 return alloc_sname(buf);
1177 }
1178
1179 if (math_str) {
1180 snprintf(buf, sizeof(buf), "%s[%s]", return_ranges, math_str);
1181 return alloc_sname(buf);
1182 }
1183
1184 compare_str = get_return_compare_str(expr);
1185 if (compare_str) {
1186 snprintf(buf, sizeof(buf), "%s%s", return_ranges, compare_str);
1187 return alloc_sname(buf);
1188 }
1189 return return_ranges;
1190 }
1191
1192 static int split_positive_from_negative(struct expression *expr)
1193 {
1194 struct returned_state_callback *cb;
1195 struct range_list *rl;
1196 const char *return_ranges;
1197 struct range_list *ret_rl;
1198 int undo;
1199
1200 /* We're going to print the states 3 times */
1201 if (stree_count(__get_cur_stree()) > 10000 / 3)
1202 return 0;
1203
1204 if (!get_implied_rl(expr, &rl) || !rl)
1205 return 0;
1206 if (is_whole_rl(rl) || is_whole_rl_non_zero(rl))
1207 return 0;
1208 /* Forget about INT_MAX and larger */
1209 if (rl_max(rl).value <= 0)
1210 return 0;
1211 if (!sval_is_negative(rl_min(rl)))
1212 return 0;
1213
1214 if (!assume(compare_expression(expr, '>', zero_expr())))
1215 return 0;
1216
1217 return_id++;
1218 return_ranges = get_return_ranges_str(expr, &ret_rl);
1219 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));
1220 FOR_EACH_PTR(returned_state_callbacks, cb) {
1221 cb->callback(return_id, (char *)return_ranges, expr);
1222 } END_FOR_EACH_PTR(cb);
1223
1224 end_assume();
1225
1226 if (rl_has_sval(rl, sval_type_val(rl_type(rl), 0))) {
1227 undo = assume(compare_expression(expr, SPECIAL_EQUAL, zero_expr()));
1228
1229 return_id++;
1230 return_ranges = get_return_ranges_str(expr, &ret_rl);
1231 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));
1232 FOR_EACH_PTR(returned_state_callbacks, cb) {
1233 cb->callback(return_id, (char *)return_ranges, expr);
1234 } END_FOR_EACH_PTR(cb);
1235
1236 if (undo)
1237 end_assume();
1238 }
1239
1240 undo = assume(compare_expression(expr, '<', zero_expr()));
1241
1242 return_id++;
1243 return_ranges = get_return_ranges_str(expr, &ret_rl);
1244 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));
1245 FOR_EACH_PTR(returned_state_callbacks, cb) {
1246 cb->callback(return_id, (char *)return_ranges, expr);
1247 } END_FOR_EACH_PTR(cb);
1248
1249 if (undo)
1250 end_assume();
1251
1252 return 1;
1253 }
1254
1255 static int call_return_state_hooks_split_null_non_null(struct expression *expr)
1256 {
1257 struct returned_state_callback *cb;
1258 struct range_list *rl;
1259 struct range_list *nonnull_rl;
1260 sval_t null_sval;
1261 struct range_list *null_rl = NULL;
1262 char *return_ranges;
1263 struct sm_state *sm;
1264 struct smatch_state *state;
1265 int nr_states;
1266 int final_pass_orig = final_pass;
1267
1268 if (!expr || expr_equal_to_param(expr, -1))
1269 return 0;
1270 if (expr->type == EXPR_CALL)
1271 return 0;
1272 if (!is_pointer(expr))
1273 return 0;
1274
1275 sm = get_sm_state_expr(SMATCH_EXTRA, expr);
1276 if (!sm)
1277 return 0;
1278 if (ptr_list_size((struct ptr_list *)sm->possible) == 1)
1279 return 0;
1280 state = sm->state;
1281 if (!estate_rl(state))
1282 return 0;
1283 if (estate_min(state).value == 0 && estate_max(state).value == 0)
1284 return 0;
1285 if (!rl_has_sval(estate_rl(state), sval_type_val(estate_type(state), 0)))
1286 return 0;
1287
1288 nr_states = stree_count(__get_cur_stree());
1289 if (option_info && nr_states >= 1500)
1290 return 0;
1291
1292 rl = estate_rl(state);
1293
1294 __push_fake_cur_stree();
1295
1296 final_pass = 0;
1297 __split_whole_condition(expr);
1298 final_pass = final_pass_orig;
1299
1300 nonnull_rl = rl_filter(rl, rl_zero());
1301 return_ranges = show_rl(nonnull_rl);
1302 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(nonnull_rl));
1303
1304 return_id++;
1305 FOR_EACH_PTR(returned_state_callbacks, cb) {
1306 cb->callback(return_id, return_ranges, expr);
1307 } END_FOR_EACH_PTR(cb);
1308
1309 __push_true_states();
1310 __use_false_states();
1311
1312 return_ranges = alloc_sname("0");
1313 null_sval = sval_type_val(rl_type(rl), 0);
1314 add_range(&null_rl, null_sval, null_sval);
1315 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(null_rl));
1316 return_id++;
1317 FOR_EACH_PTR(returned_state_callbacks, cb) {
1318 cb->callback(return_id, return_ranges, expr);
1319 } END_FOR_EACH_PTR(cb);
1320
1321 __merge_true_states();
1322 __free_fake_cur_stree();
1323
1324 return 1;
1325 }
1326
1327 static int call_return_state_hooks_split_success_fail(struct expression *expr)
1328 {
1329 struct range_list *rl;
1330 struct range_list *nonzero_rl;
1331 sval_t zero_sval;
1332 struct range_list *zero_rl = NULL;
1333 int nr_states;
1334 struct returned_state_callback *cb;
1335 char *return_ranges;
1336 int final_pass_orig = final_pass;
1337 sval_t val;
1338
1339 if (option_project != PROJ_KERNEL)
1340 return 0;
1341
1342 nr_states = stree_count(__get_cur_stree());
1343 if (nr_states > 1500)
1344 return 0;
1345
1346 if (get_value(expr, &val))
1347 return 0;
1348 if (!get_implied_rl(expr, &rl))
1349 return 0;
1350 if (rl_min(rl).value < -4095 || rl_min(rl).value >= 0)
1351 return 0;
1352 if (rl_max(rl).value != 0)
1353 return 0;
1354
1355 __push_fake_cur_stree();
1356
1357 final_pass = 0;
1358 __split_whole_condition(expr);
1359 final_pass = final_pass_orig;
1360
1361 nonzero_rl = rl_filter(rl, rl_zero());
1362 return_ranges = show_rl(nonzero_rl);
1363 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(nonzero_rl));
1364
1365 return_id++;
1366 FOR_EACH_PTR(returned_state_callbacks, cb) {
1367 cb->callback(return_id, return_ranges, expr);
1368 } END_FOR_EACH_PTR(cb);
1369
1370 __push_true_states();
1371 __use_false_states();
1372
1373 return_ranges = alloc_sname("0");
1374 zero_sval = sval_type_val(rl_type(rl), 0);
1375 add_range(&zero_rl, zero_sval, zero_sval);
1376 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(zero_rl));
1377 return_id++;
1378 FOR_EACH_PTR(returned_state_callbacks, cb) {
1379 cb->callback(return_id, return_ranges, expr);
1380 } END_FOR_EACH_PTR(cb);
1381
1382 __merge_true_states();
1383 __free_fake_cur_stree();
1384
1385 return 1;
1386 }
1387
1388 static int is_boolean(struct expression *expr)
1389 {
1390 struct range_list *rl;
1391
1392 if (!get_implied_rl(expr, &rl))
1393 return 0;
1394 if (rl_min(rl).value == 0 && rl_max(rl).value == 1)
1395 return 1;
1396 return 0;
1397 }
1398
1399 static int is_conditional(struct expression *expr)
1400 {
1401 if (!expr)
1402 return 0;
1403 if (expr->type == EXPR_CONDITIONAL || expr->type == EXPR_SELECT)
1404 return 1;
1405 return 0;
1406 }
1407
1408 static int splitable_function_call(struct expression *expr)
1409 {
1410 struct sm_state *sm;
1411 char buf[64];
1412
1413 if (!expr || expr->type != EXPR_CALL)
1414 return 0;
1415 snprintf(buf, sizeof(buf), "return %p", expr);
1416 sm = get_sm_state(SMATCH_EXTRA, buf, NULL);
1417 return split_possible_helper(sm, expr);
1418 }
1419
1420 static struct sm_state *find_bool_param(void)
1421 {
1422 struct stree *start_states;
1423 struct symbol *arg;
1424 struct sm_state *sm, *tmp;
1425 sval_t sval;
1426
1427 start_states = get_start_states();
1428
1429 FOR_EACH_PTR_REVERSE(cur_func_sym->ctype.base_type->arguments, arg) {
1430 if (!arg->ident)
1431 continue;
1432 sm = get_sm_state_stree(start_states, SMATCH_EXTRA, arg->ident->name, arg);
1433 if (!sm)
1434 continue;
1435 if (rl_min(estate_rl(sm->state)).value != 0 ||
1436 rl_max(estate_rl(sm->state)).value != 1)
1437 continue;
1438 goto found;
1439 } END_FOR_EACH_PTR_REVERSE(arg);
1440
1441 return NULL;
1442
1443 found:
1444 /*
1445 * Check if it's splitable. If not, then splitting it up is likely not
1446 * useful for the callers.
1447 */
1448 FOR_EACH_PTR(sm->possible, tmp) {
1449 if (is_merged(tmp))
1450 continue;
1451 if (!estate_get_single_value(tmp->state, &sval))
1452 return NULL;
1453 } END_FOR_EACH_PTR(tmp);
1454
1455 return sm;
1456 }
1457
1458 static int split_on_bool_sm(struct sm_state *sm, struct expression *expr)
1459 {
1460 struct returned_state_callback *cb;
1461 struct range_list *ret_rl;
1462 const char *return_ranges;
1463 struct sm_state *tmp;
1464 int ret = 0;
1465 int nr_possible, nr_states;
1466 char *compare_str = NULL;
1467 char buf[128];
1468 struct state_list *already_handled = NULL;
1469
1470 if (!sm || !sm->merged)
1471 return 0;
1472
1473 if (too_many_possible(sm))
1474 return 0;
1475
1476 /* bail if it gets too complicated */
1477 nr_possible = ptr_list_size((struct ptr_list *)sm->possible);
1478 nr_states = stree_count(__get_cur_stree());
1479 if (nr_states * nr_possible >= 2000)
1480 return 0;
1481
1482 FOR_EACH_PTR(sm->possible, tmp) {
1483 if (tmp->merged)
1484 continue;
1485 if (ptr_in_list(tmp, already_handled))
1486 continue;
1487 add_ptr_list(&already_handled, tmp);
1488
1489 ret = 1;
1490 __push_fake_cur_stree();
1491
1492 overwrite_states_using_pool(sm, tmp);
1493
1494 return_ranges = get_return_ranges_str(expr, &ret_rl);
1495 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));
1496 compare_str = get_return_compare_str(expr);
1497 if (compare_str) {
1498 snprintf(buf, sizeof(buf), "%s%s", return_ranges, compare_str);
1499 return_ranges = alloc_sname(buf);
1500 }
1501
1502 return_id++;
1503 FOR_EACH_PTR(returned_state_callbacks, cb) {
1504 cb->callback(return_id, (char *)return_ranges, expr);
1505 } END_FOR_EACH_PTR(cb);
1506
1507 __free_fake_cur_stree();
1508 } END_FOR_EACH_PTR(tmp);
1509
1510 free_slist(&already_handled);
1511
1512 return ret;
1513 }
1514
1515 static int split_by_bool_param(struct expression *expr)
1516 {
1517 struct sm_state *start_sm, *sm;
1518 sval_t sval;
1519
1520 start_sm = find_bool_param();
1521 if (!start_sm)
1522 return 0;
1523 sm = get_sm_state(SMATCH_EXTRA, start_sm->name, start_sm->sym);
1524 if (!sm || estate_get_single_value(sm->state, &sval))
1525 return 0;
1526 return split_on_bool_sm(sm, expr);
1527 }
1528
1529 static int split_by_null_nonnull_param(struct expression *expr)
1530 {
1531 struct symbol *arg;
1532 struct sm_state *sm;
1533
1534 /* function must only take one pointer */
1535 if (ptr_list_size((struct ptr_list *)cur_func_sym->ctype.base_type->arguments) != 1)
1536 return 0;
1537 arg = first_ptr_list((struct ptr_list *)cur_func_sym->ctype.base_type->arguments);
1538 if (!arg->ident)
1539 return 0;
1540 if (get_real_base_type(arg)->type != SYM_PTR)
1541 return 0;
1542
1543 if (param_was_set_var_sym(arg->ident->name, arg))
1544 return 0;
1545 sm = get_sm_state(SMATCH_EXTRA, arg->ident->name, arg);
1546 if (!sm)
1547 return 0;
1548
1549 return split_on_bool_sm(sm, expr);
1550 }
1551
1552 static void call_return_state_hooks(struct expression *expr)
1553 {
1554 struct returned_state_callback *cb;
1555 struct range_list *ret_rl;
1556 const char *return_ranges;
1557 int nr_states;
1558 sval_t sval;
1559
1560 if (__path_is_null())
1561 return;
1562
1563 expr = strip_expr(expr);
1564
1565 if (is_impossible_path())
1566 goto vanilla;
1567
1568 if (expr && (expr->type == EXPR_COMPARE ||
1569 !get_implied_value(expr, &sval)) &&
1570 (is_condition(expr) || is_boolean(expr))) {
1571 call_return_state_hooks_compare(expr);
1572 return;
1573 } else if (is_conditional(expr)) {
1574 call_return_state_hooks_conditional(expr);
1575 return;
1576 } else if (call_return_state_hooks_split_possible(expr)) {
1577 return;
1578 } else if (call_return_state_hooks_split_null_non_null(expr)) {
1579 return;
1580 } else if (call_return_state_hooks_split_success_fail(expr)) {
1581 return;
1582 } else if (splitable_function_call(expr)) {
1583 return;
1584 } else if (split_positive_from_negative(expr)) {
1585 return;
1586 } else if (split_by_bool_param(expr)) {
1587 } else if (split_by_null_nonnull_param(expr)) {
1588 return;
1589 }
1590
1591 vanilla:
1592 return_ranges = get_return_ranges_str(expr, &ret_rl);
1593 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));
1594
1595 return_id++;
1596 nr_states = stree_count(__get_cur_stree());
1597 if (nr_states >= 10000) {
1598 match_return_info(return_id, (char *)return_ranges, expr);
1599 return;
1600 }
1601 FOR_EACH_PTR(returned_state_callbacks, cb) {
1602 cb->callback(return_id, (char *)return_ranges, expr);
1603 } END_FOR_EACH_PTR(cb);
1604 }
1605
1606 static void print_returned_struct_members(int return_id, char *return_ranges, struct expression *expr)
1607 {
1608 struct returned_member_callback *cb;
1609 struct stree *stree;
1610 struct sm_state *sm;
1611 struct symbol *type;
1612 char *name;
1613 char member_name[256];
1614 int len;
1615
1616 type = get_type(expr);
1617 if (!type || type->type != SYM_PTR)
1618 return;
1619 name = expr_to_var(expr);
1620 if (!name)
1621 return;
1622
1623 member_name[sizeof(member_name) - 1] = '\0';
1624 strcpy(member_name, "$");
1625
1626 len = strlen(name);
1627 FOR_EACH_PTR(returned_member_callbacks, cb) {
1628 stree = __get_cur_stree();
1629 FOR_EACH_MY_SM(cb->owner, stree, sm) {
1630 if (sm->name[0] == '*' && strcmp(sm->name + 1, name) == 0) {
1631 strcpy(member_name, "*$");
1632 cb->callback(return_id, return_ranges, expr, member_name, sm->state);
1633 continue;
1634 }
1635 if (strncmp(sm->name, name, len) != 0)
1636 continue;
1637 if (strncmp(sm->name + len, "->", 2) != 0)
1638 continue;
1639 snprintf(member_name, sizeof(member_name), "$%s", sm->name + len);
1640 cb->callback(return_id, return_ranges, expr, member_name, sm->state);
1641 } END_FOR_EACH_SM(sm);
1642 } END_FOR_EACH_PTR(cb);
1643
1644 free_string(name);
1645 }
1646
1647 static void reset_memdb(struct symbol *sym)
1648 {
1649 mem_sql(NULL, NULL, "delete from caller_info;");
1650 mem_sql(NULL, NULL, "delete from return_states;");
1651 mem_sql(NULL, NULL, "delete from call_implies;");
1652 }
1653
1654 static void match_end_func_info(struct symbol *sym)
1655 {
1656 if (__path_is_null())
1657 return;
1658 call_return_state_hooks(NULL);
1659 }
1660
1661 static void match_after_func(struct symbol *sym)
1662 {
1663 if (!__inline_fn)
1664 reset_memdb(sym);
1665 }
1666
1667 static void init_memdb(void)
1668 {
1669 char *err = NULL;
1670 int rc;
1671 const char *schema_files[] = {
1672 "db/db.schema",
1673 "db/caller_info.schema",
1674 "db/return_states.schema",
1675 "db/function_type_size.schema",
1676 "db/type_size.schema",
1677 "db/call_implies.schema",
1678 "db/function_ptr.schema",
1679 "db/local_values.schema",
1680 "db/function_type_value.schema",
1681 "db/type_value.schema",
1682 "db/function_type.schema",
1683 "db/data_info.schema",
1684 "db/parameter_name.schema",
1685 };
1686 static char buf[4096];
1687 int fd;
1688 int ret;
1689 int i;
1690
1691 rc = sqlite3_open(":memory:", &mem_db);
1692 if (rc != SQLITE_OK) {
1693 printf("Error starting In-Memory database.");
1694 return;
1695 }
1696
1697 for (i = 0; i < ARRAY_SIZE(schema_files); i++) {
1698 fd = open_data_file(schema_files[i]);
1699 if (fd < 0) {
1700 mem_db = NULL;
1701 return;
1702 }
1703 ret = read(fd, buf, sizeof(buf));
1704 if (ret == sizeof(buf)) {
1705 printf("Schema file too large: %s (limit %zd bytes)",
1706 schema_files[i], sizeof(buf));
1707 }
1708 buf[ret] = '\0';
1709 rc = sqlite3_exec(mem_db, buf, NULL, NULL, &err);
1710 if (rc != SQLITE_OK) {
1711 fprintf(stderr, "SQL error #2: %s\n", err);
1712 fprintf(stderr, "%s\n", buf);
1713 }
1714 }
1715 }
1716
1717 void open_smatch_db(void)
1718 {
1719 int rc;
1720
1721 if (option_no_db)
1722 return;
1723
1724 init_memdb();
1725
1726 rc = sqlite3_open_v2("smatch_db.sqlite", &db, SQLITE_OPEN_READONLY, NULL);
1727 if (rc != SQLITE_OK) {
1728 option_no_db = 1;
1729 return;
1730 }
1731 return;
1732 }
1733
1734 static void register_common_funcs(void)
1735 {
1736 struct token *token;
1737 char *func;
1738 char filename[256];
1739
1740 if (option_project == PROJ_NONE)
1741 strcpy(filename, "common_functions");
1742 else
1743 snprintf(filename, 256, "%s.common_functions", option_project_str);
1744
1745 token = get_tokens_file(filename);
1746 if (!token)
1747 return;
1748 if (token_type(token) != TOKEN_STREAMBEGIN)
1749 return;
1750 token = token->next;
1751 while (token_type(token) != TOKEN_STREAMEND) {
1752 if (token_type(token) != TOKEN_IDENT)
1753 return;
1754 func = alloc_string(show_ident(token->ident));
1755 add_ptr_list(&common_funcs, func);
1756 token = token->next;
1757 }
1758 clear_token_alloc();
1759 }
1760
1761 static char *get_next_string(char **str)
1762 {
1763 static char string[256];
1764 char *start;
1765 char *p = *str;
1766 int len;
1767
1768 if (*p == '\0')
1769 return NULL;
1770 start = p;
1771
1772 while (*p != '\0' && *p != ' ' && *p != '\n')
1773 p++;
1774
1775 len = p - start;
1776 if (len > 256) {
1777 memcpy(string, start, 255);
1778 string[255] = '\0';
1779 printf("return_fix: '%s' too long", string);
1780 **str = '\0';
1781 return NULL;
1782 }
1783 memcpy(string, start, len);
1784 string[len] = '\0';
1785 if (*p != '\0')
1786 p++;
1787 *str = p;
1788 return string;
1789 }
1790
1791 static void register_return_replacements(void)
1792 {
1793 char *func, *orig, *new;
1794 char filename[256];
1795 char buf[4096];
1796 int fd, ret, i;
1797 char *p;
1798
1799 snprintf(filename, 256, "db/%s.return_fixes", option_project_str);
1800 fd = open_data_file(filename);
1801 if (fd < 0)
1802 return;
1803 ret = read(fd, buf, sizeof(buf));
1804 close(fd);
1805 if (ret < 0)
1806 return;
1807 if (ret == sizeof(buf)) {
1808 printf("file too large: %s (limit %zd bytes)",
1809 filename, sizeof(buf));
1810 return;
1811 }
1812 buf[ret] = '\0';
1813
1814 p = buf;
1815 while (*p) {
1816 get_next_string(&p);
1817 replace_count++;
1818 }
1819 if (replace_count == 0 || replace_count % 3 != 0) {
1820 replace_count = 0;
1821 return;
1822 }
1823 replace_table = malloc(replace_count * sizeof(char *));
1824
1825 p = buf;
1826 i = 0;
1827 while (*p) {
1828 func = alloc_string(get_next_string(&p));
1829 orig = alloc_string(get_next_string(&p));
1830 new = alloc_string(get_next_string(&p));
1831
1832 replace_table[i++] = func;
1833 replace_table[i++] = orig;
1834 replace_table[i++] = new;
1835 }
1836 }
1837
1838 void register_definition_db_callbacks(int id)
1839 {
1840 add_hook(&match_call_info, FUNCTION_CALL_HOOK);
1841 add_hook(&global_variable, BASE_HOOK);
1842 add_hook(&global_variable, DECLARATION_HOOK);
1843 add_split_return_callback(match_return_info);
1844 add_split_return_callback(print_returned_struct_members);
1845 add_hook(&call_return_state_hooks, RETURN_HOOK);
1846 add_hook(&match_end_func_info, END_FUNC_HOOK);
1847 add_hook(&match_after_func, AFTER_FUNC_HOOK);
1848
1849 add_hook(&match_data_from_db, FUNC_DEF_HOOK);
1850 add_hook(&match_call_implies, CALL_HOOK_AFTER_INLINE);
1851
1852 register_common_funcs();
1853 register_return_replacements();
1854 }
1855
1856 void register_db_call_marker(int id)
1857 {
1858 add_hook(&match_call_marker, FUNCTION_CALL_HOOK);
1859 }
1860
1861 char *return_state_to_var_sym(struct expression *expr, int param, const char *key, struct symbol **sym)
1862 {
1863 struct expression *arg;
1864 char *name = NULL;
1865 char member_name[256];
1866
1867 *sym = NULL;
1868
1869 if (param == -1) {
1870 const char *star = "";
1871
1872 if (expr->type != EXPR_ASSIGNMENT)
1873 return NULL;
1874 name = expr_to_var_sym(expr->left, sym);
1875 if (!name)
1876 return NULL;
1877 if (key[0] == '*') {
1878 star = "*";
1879 key++;
1880 }
1881 if (strncmp(key, "$", 1) != 0)
1882 return name;
1883 snprintf(member_name, sizeof(member_name), "%s%s%s", star, name, key + 1);
1884 free_string(name);
1885 return alloc_string(member_name);
1886 }
1887
1888 while (expr->type == EXPR_ASSIGNMENT)
1889 expr = strip_expr(expr->right);
1890 if (expr->type != EXPR_CALL)
1891 return NULL;
1892
1893 arg = get_argument_from_call_expr(expr->args, param);
1894 if (!arg)
1895 return NULL;
1896
1897 return get_variable_from_key(arg, key, sym);
1898 }
1899
1900 char *get_variable_from_key(struct expression *arg, const char *key, struct symbol **sym)
1901 {
1902 char buf[256];
1903 char *tmp;
1904
1905 if (!arg)
1906 return NULL;
1907
1908 arg = strip_expr(arg);
1909
1910 if (strcmp(key, "$") == 0)
1911 return expr_to_var_sym(arg, sym);
1912
1913 if (strcmp(key, "*$") == 0) {
1914 if (arg->type == EXPR_PREOP && arg->op == '&') {
1915 arg = strip_expr(arg->unop);
1916 return expr_to_var_sym(arg, sym);
1917 } else {
1918 tmp = expr_to_var_sym(arg, sym);
1919 if (!tmp)
1920 return NULL;
1921 snprintf(buf, sizeof(buf), "*%s", tmp);
1922 free_string(tmp);
1923 return alloc_string(buf);
1924 }
1925 }
1926
1927 if (arg->type == EXPR_PREOP && arg->op == '&') {
1928 arg = strip_expr(arg->unop);
1929 tmp = expr_to_var_sym(arg, sym);
1930 if (!tmp)
1931 return NULL;
1932 snprintf(buf, sizeof(buf), "%s.%s", tmp, key + 3);
1933 return alloc_string(buf);
1934 }
1935
1936 tmp = expr_to_var_sym(arg, sym);
1937 if (!tmp)
1938 return NULL;
1939 snprintf(buf, sizeof(buf), "%s%s", tmp, key + 1);
1940 free_string(tmp);
1941 return alloc_string(buf);
1942 }
1943
1944 char *get_chunk_from_key(struct expression *arg, char *key, struct symbol **sym, struct var_sym_list **vsl)
1945 {
1946 *vsl = NULL;
1947
1948 if (strcmp("$", key) == 0)
1949 return expr_to_chunk_sym_vsl(arg, sym, vsl);
1950 return get_variable_from_key(arg, key, sym);
1951 }
1952
1953 const char *state_name_to_param_name(const char *state_name, const char *param_name)
1954 {
1955 int name_len;
1956 static char buf[256];
1957
1958 name_len = strlen(param_name);
1959
1960 if (strcmp(state_name, param_name) == 0) {
1961 return "$";
1962 } else if (state_name[name_len] == '-' && /* check for '-' from "->" */
1963 strncmp(state_name, param_name, name_len) == 0) {
1964 snprintf(buf, sizeof(buf), "$%s", state_name + name_len);
1965 return buf;
1966 } else if (state_name[0] == '*' && strcmp(state_name + 1, param_name) == 0) {
1967 return "*$";
1968 }
1969 return NULL;
1970 }
1971
1972 const char *get_param_name_var_sym(const char *name, struct symbol *sym)
1973 {
1974 if (!sym || !sym->ident)
1975 return NULL;
1976
1977 return state_name_to_param_name(name, sym->ident->name);
1978 }
1979
1980 const char *get_param_name(struct sm_state *sm)
1981 {
1982 return get_param_name_var_sym(sm->name, sm->sym);
1983 }
1984
1985 char *get_data_info_name(struct expression *expr)
1986 {
1987 struct symbol *sym;
1988 char *name;
1989 char buf[256];
1990 char *ret = NULL;
1991
1992 expr = strip_expr(expr);
1993 name = get_member_name(expr);
1994 if (name)
1995 return name;
1996 name = expr_to_var_sym(expr, &sym);
1997 if (!name || !sym)
1998 goto free;
1999 if (!(sym->ctype.modifiers & MOD_TOPLEVEL))
2000 goto free;
2001 if (sym->ctype.modifiers & MOD_STATIC)
2002 snprintf(buf, sizeof(buf), "static %s", name);
2003 else
2004 snprintf(buf, sizeof(buf), "global %s", name);
2005 ret = alloc_sname(buf);
2006 free:
2007 free_string(name);
2008 return ret;
2009 }
Static analysis for C