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expressions: make assign_expression() take an op argument
[smatch.git] / smatch_db.c
blobf1fe5f77bd8bd804928c1174b473c2336ce49219
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_helper(table, ignore, late, 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 %sinto %s values (", \
44 ignore ? "or ignore " : "", #table); \
45 p += snprintf(p, buf + sizeof(buf) - p, values); \
46 p += snprintf(p, buf + sizeof(buf) - p, ");"); \
47 sm_debug("in-mem: %s\n", buf); \
48 rc = sqlite3_exec(mem_db, buf, NULL, NULL, &err); \
49 if (rc != SQLITE_OK) { \
50 fprintf(stderr, "SQL error #2: %s\n", err); \
51 fprintf(stderr, "SQL: '%s'\n", buf); \
52 parse_error = 1; \
53 } \
54 break; \
55 } \
56 if (option_info) { \
57 FILE *tmp_fd = sm_outfd; \
58 sm_outfd = sql_outfd; \
59 sm_prefix(); \
60 sm_printf("SQL%s: insert %sinto " #table " values(", \
61 late ? "_late" : "", ignore ? "or ignore " : ""); \
62 sm_printf(values); \
63 sm_printf(");\n"); \
64 sm_outfd = tmp_fd; \
65 } \
66 } while (0)
67
68 #define sql_insert(table, values...) sql_insert_helper(table, 0, 0, values);
69 #define sql_insert_or_ignore(table, values...) sql_insert_helper(table, 1, 0, values);
70 #define sql_insert_late(table, values...) sql_insert_helper(table, 0, 1, values);
71
72 struct def_callback {
73 int hook_type;
74 void (*callback)(const char *name, struct symbol *sym, char *key, char *value);
75 };
76 ALLOCATOR(def_callback, "definition db hook callbacks");
77 DECLARE_PTR_LIST(callback_list, struct def_callback);
78 static struct callback_list *select_caller_info_callbacks;
79
80 struct member_info_callback {
81 int owner;
82 void (*callback)(struct expression *call, int param, char *printed_name, struct sm_state *sm);
83 };
84 ALLOCATOR(member_info_callback, "caller_info callbacks");
85 DECLARE_PTR_LIST(member_info_cb_list, struct member_info_callback);
86 static struct member_info_cb_list *member_callbacks;
87
88 struct returned_state_callback {
89 void (*callback)(int return_id, char *return_ranges, struct expression *return_expr);
90 };
91 ALLOCATOR(returned_state_callback, "returned state callbacks");
92 DECLARE_PTR_LIST(returned_state_cb_list, struct returned_state_callback);
93 static struct returned_state_cb_list *returned_state_callbacks;
94
95 struct returned_member_callback {
96 int owner;
97 void (*callback)(int return_id, char *return_ranges, struct expression *expr, char *printed_name, struct smatch_state *state);
98 };
99 ALLOCATOR(returned_member_callback, "returned member callbacks");
100 DECLARE_PTR_LIST(returned_member_cb_list, struct returned_member_callback);
101 static struct returned_member_cb_list *returned_member_callbacks;
102
103 struct call_implies_callback {
104 int type;
105 void (*callback)(struct expression *call, struct expression *arg, char *key, char *value);
106 };
107 ALLOCATOR(call_implies_callback, "call_implies callbacks");
108 DECLARE_PTR_LIST(call_implies_cb_list, struct call_implies_callback);
109 static struct call_implies_cb_list *call_implies_cb_list;
110
111 static int print_sql_output(void *unused, int argc, char **argv, char **azColName)
112 {
113 int i;
114
115 for (i = 0; i < argc; i++) {
116 if (i != 0)
117 printf(", ");
118 sm_printf("%s", argv[i]);
119 }
120 sm_printf("\n");
121 return 0;
122 }
123
124 void debug_sql(const char *sql)
125 {
126 if (!option_debug)
127 return;
128 sm_msg("%s", sql);
129 sql_exec(print_sql_output, NULL, sql);
130 }
131
132 void debug_mem_sql(const char *sql)
133 {
134 if (!option_debug)
135 return;
136 sm_msg("%s", sql);
137 sql_mem_exec(print_sql_output, NULL, sql);
138 }
139
140 void sql_exec(int (*callback)(void*, int, char**, char**), void *data, const char *sql)
141 {
142 char *err = NULL;
143 int rc;
144
145 if (option_no_db || !db)
146 return;
147
148 rc = sqlite3_exec(db, sql, callback, data, &err);
149 if (rc != SQLITE_OK && !parse_error) {
150 fprintf(stderr, "SQL error #2: %s\n", err);
151 fprintf(stderr, "SQL: '%s'\n", sql);
152 parse_error = 1;
153 }
154 }
155
156 void sql_mem_exec(int (*callback)(void*, int, char**, char**), void *data, const char *sql)
157 {
158 char *err = NULL;
159 int rc;
160
161 if (!mem_db)
162 return;
163
164 rc = sqlite3_exec(mem_db, sql, callback, data, &err);
165 if (rc != SQLITE_OK) {
166 fprintf(stderr, "SQL error #2: %s\n", err);
167 fprintf(stderr, "SQL: '%s'\n", sql);
168 parse_error = 1;
169 }
170 }
171
172 static int replace_count;
173 static char **replace_table;
174 static const char *replace_return_ranges(const char *return_ranges)
175 {
176 int i;
177
178 if (!get_function()) {
179 /* I have no idea why EXPORT_SYMBOL() is here */
180 return return_ranges;
181 }
182 for (i = 0; i < replace_count; i += 3) {
183 if (strcmp(replace_table[i + 0], get_function()) == 0) {
184 if (strcmp(replace_table[i + 1], return_ranges) == 0)
185 return replace_table[i + 2];
186 }
187 }
188 return return_ranges;
189 }
190
191 void sql_insert_return_states(int return_id, const char *return_ranges,
192 int type, int param, const char *key, const char *value)
193 {
194 if (key && strlen(key) >= 80)
195 return;
196 return_ranges = replace_return_ranges(return_ranges);
197 sql_insert(return_states, "'%s', '%s', %lu, %d, '%s', %d, %d, %d, '%s', '%s'",
198 get_base_file(), get_function(), (unsigned long)__inline_fn,
199 return_id, return_ranges, fn_static(), type, param, key, value);
200 }
201
202 static struct string_list *common_funcs;
203 static int is_common_function(const char *fn)
204 {
205 char *tmp;
206
207 if (!fn)
208 return 0;
209
210 if (strncmp(fn, "__builtin_", 10) == 0)
211 return 1;
212
213 FOR_EACH_PTR(common_funcs, tmp) {
214 if (strcmp(tmp, fn) == 0)
215 return 1;
216 } END_FOR_EACH_PTR(tmp);
217
218 return 0;
219 }
220
221 static char *function_signature(void)
222 {
223 return type_to_str(get_real_base_type(cur_func_sym));
224 }
225
226 void sql_insert_caller_info(struct expression *call, int type,
227 int param, const char *key, const char *value)
228 {
229 FILE *tmp_fd = sm_outfd;
230 char *fn;
231
232 if (!option_info && !__inline_call)
233 return;
234
235 if (key && strlen(key) >= 80)
236 return;
237
238 fn = get_fnptr_name(call->fn);
239 if (!fn)
240 return;
241
242 if (__inline_call) {
243 mem_sql(NULL, NULL,
244 "insert into caller_info values ('%s', '%s', '%s', %lu, %d, %d, %d, '%s', '%s');",
245 get_base_file(), get_function(), fn, (unsigned long)call,
246 is_static(call->fn), type, param, key, value);
247 }
248
249 if (!option_info)
250 return;
251
252 if (strncmp(fn, "__builtin_", 10) == 0)
253 return;
254 if (type != INTERNAL && is_common_function(fn))
255 return;
256
257 sm_outfd = caller_info_fd;
258 sm_msg("SQL_caller_info: insert into caller_info values ("
259 "'%s', '%s', '%s', %%CALL_ID%%, %d, %d, %d, '%s', '%s');",
260 get_base_file(), get_function(), fn, is_static(call->fn),
261 type, param, key, value);
262 sm_outfd = tmp_fd;
263
264 free_string(fn);
265 }
266
267 void sql_insert_function_ptr(const char *fn, const char *struct_name)
268 {
269 sql_insert(function_ptr, "'%s', '%s', '%s', 0", get_base_file(), fn,
270 struct_name);
271 }
272
273 void sql_insert_call_implies(int type, int param, const char *key, const char *value)
274 {
275 sql_insert(call_implies, "'%s', '%s', %lu, %d, %d, %d, '%s', '%s'", get_base_file(),
276 get_function(), (unsigned long)__inline_fn, fn_static(),
277 type, param, key, value);
278 }
279
280 void sql_insert_function_type_size(const char *member, const char *ranges)
281 {
282 sql_insert(function_type_size, "'%s', '%s', '%s', '%s'", get_base_file(), get_function(), member, ranges);
283 }
284
285 void sql_insert_local_values(const char *name, const char *value)
286 {
287 sql_insert(local_values, "'%s', '%s', '%s'", get_base_file(), name, value);
288 }
289
290 void sql_insert_function_type_value(const char *type, const char *value)
291 {
292 sql_insert(function_type_value, "'%s', '%s', '%s', '%s'", get_base_file(), get_function(), type, value);
293 }
294
295 void sql_insert_function_type(int param, const char *value)
296 {
297 sql_insert(function_type, "'%s', '%s', %d, %d, '%s'",
298 get_base_file(), get_function(), fn_static(), param, value);
299 }
300
301 void sql_insert_parameter_name(int param, const char *value)
302 {
303 sql_insert(parameter_name, "'%s', '%s', %d, %d, '%s'",
304 get_base_file(), get_function(), fn_static(), param, value);
305 }
306
307 void sql_insert_data_info(struct expression *data, int type, const char *value)
308 {
309 char *data_name;
310
311 data_name = get_data_info_name(data);
312 if (!data_name)
313 return;
314 sql_insert(data_info, "'%s', '%s', %d, '%s'",
315 is_static(data) ? get_base_file() : "extern",
316 data_name, type, value);
317 }
318
319 void sql_insert_data_info_var_sym(const char *var, struct symbol *sym, int type, const char *value)
320 {
321 sql_insert(data_info, "'%s', '%s', %d, '%s'",
322 (sym->ctype.modifiers & MOD_STATIC) ? get_base_file() : "extern",
323 var, type, value);
324 }
325
326 void sql_save_constraint(const char *con)
327 {
328 if (!option_info)
329 return;
330
331 sm_msg("SQL: insert or ignore into constraints (str) values('%s');", con);
332 }
333
334 void sql_save_constraint_required(const char *data, int op, const char *limit)
335 {
336 sql_insert_or_ignore(constraints_required, "'%s', '%s', '%s'", data, show_special(op), limit);
337 }
338
339 void sql_copy_constraint_required(const char *new_limit, const char *old_limit)
340 {
341 if (!option_info)
342 return;
343
344 sm_msg("SQL_late: insert or ignore into constraints_required (data, op, bound) "
345 "select constraints_required.data, constraints_required.op, '%s' from "
346 "constraints_required where bound = '%s';", new_limit, old_limit);
347 }
348
349 void sql_insert_fn_ptr_data_link(const char *ptr, const char *data)
350 {
351 sql_insert_or_ignore(fn_ptr_data_link, "'%s', '%s'", ptr, data);
352 }
353
354 void sql_insert_fn_data_link(struct expression *fn, int type, int param, const char *key, const char *value)
355 {
356 if (fn->type != EXPR_SYMBOL || !fn->symbol->ident)
357 return;
358
359 sql_insert(fn_data_link, "'%s', '%s', %d, %d, %d, '%s', '%s'",
360 (fn->symbol->ctype.modifiers & MOD_STATIC) ? get_base_file() : "extern",
361 fn->symbol->ident->name,
362 !!(fn->symbol->ctype.modifiers & MOD_STATIC),
363 type, param, key, value);
364 }
365
366 void sql_insert_mtag_about(mtag_t tag, const char *left_name, const char *right_name)
367 {
368 sql_insert(mtag_about, "%lld, '%s', '%s', %d, '%s', '%s'",
369 tag, get_filename(), get_function(), get_lineno(), left_name, right_name);
370 }
371
372 void sql_insert_mtag_data(mtag_t tag, const char *var, int offset, int type, const char *value)
373 {
374 sql_insert(mtag_data, "%lld, '%s', %d, %d, '%s'", tag, var, offset, type, value);
375 }
376
377 void sql_insert_mtag_map(mtag_t tag, int offset, mtag_t container)
378 {
379 sql_insert(mtag_map, "%lld, %d, %lld", tag, offset, container);
380 }
381
382 void sql_insert_mtag_alias(mtag_t orig, mtag_t alias)
383 {
384 sql_insert(mtag_alias, "%lld, %lld", orig, alias);
385 }
386
387 static int save_mtag(void *_tag, int argc, char **argv, char **azColName)
388 {
389 mtag_t *saved_tag = _tag;
390 mtag_t new_tag;
391
392 new_tag = strtoll(argv[0], NULL, 10);
393
394 if (!*saved_tag)
395 *saved_tag = new_tag;
396 else if (*saved_tag != new_tag)
397 *saved_tag = -1ULL;
398
399 return 0;
400 }
401
402 int mtag_map_select_container(mtag_t tag, int offset, mtag_t *container)
403 {
404 mtag_t tmp = 0;
405
406 run_sql(save_mtag, &tmp,
407 "select container from mtag_map where tag = %lld and offset = %d;",
408 tag, offset);
409
410 if (tmp == 0 || tmp == -1ULL)
411 return 0;
412 *container = tmp;
413 return 1;
414 }
415
416 int mtag_map_select_tag(mtag_t container, int offset, mtag_t *tag)
417 {
418 mtag_t tmp = 0;
419
420 run_sql(save_mtag, &tmp,
421 "select tag from mtag_map where container = %lld and offset = %d;",
422 container, offset);
423
424 if (tmp == 0 || tmp == -1ULL)
425 return 0;
426 *tag = tmp;
427 return 1;
428 }
429
430 char *get_static_filter(struct symbol *sym)
431 {
432 static char sql_filter[1024];
433
434 /* This can only happen on buggy code. Return invalid SQL. */
435 if (!sym) {
436 sql_filter[0] = '\0';
437 return sql_filter;
438 }
439
440 if (sym->ctype.modifiers & MOD_STATIC) {
441 snprintf(sql_filter, sizeof(sql_filter),
442 "file = '%s' and function = '%s' and static = '1'",
443 get_base_file(), sym->ident->name);
444 } else {
445 snprintf(sql_filter, sizeof(sql_filter),
446 "function = '%s' and static = '0'", sym->ident->name);
447 }
448
449 return sql_filter;
450 }
451
452 static int get_row_count(void *_row_count, int argc, char **argv, char **azColName)
453 {
454 int *row_count = _row_count;
455
456 *row_count = 0;
457 if (argc != 1)
458 return 0;
459 *row_count = atoi(argv[0]);
460 return 0;
461 }
462
463 static void mark_params_untracked(struct expression *call)
464 {
465 struct expression *arg;
466 int i = 0;
467
468 FOR_EACH_PTR(call->args, arg) {
469 mark_untracked(call, i++, "$", NULL);
470 } END_FOR_EACH_PTR(arg);
471 }
472
473 static void sql_select_return_states_pointer(const char *cols,
474 struct expression *call, int (*callback)(void*, int, char**, char**), void *info)
475 {
476 char *ptr;
477 int return_count = 0;
478
479 ptr = get_fnptr_name(call->fn);
480 if (!ptr)
481 return;
482
483 run_sql(get_row_count, &return_count,
484 "select count(*) from return_states join function_ptr "
485 "where return_states.function == function_ptr.function and "
486 "ptr = '%s' and searchable = 1 and type = %d;", ptr, INTERNAL);
487 /* The magic number 100 is just from testing on the kernel. */
488 if (return_count > 100) {
489 mark_params_untracked(call);
490 return;
491 }
492
493 run_sql(callback, info,
494 "select %s from return_states join function_ptr where "
495 "return_states.function == function_ptr.function and ptr = '%s' "
496 "and searchable = 1 "
497 "order by function_ptr.file, return_states.file, return_id, type;",
498 cols, ptr);
499 }
500
501 static int is_local_symbol(struct expression *expr)
502 {
503 if (expr->type != EXPR_SYMBOL)
504 return 0;
505 if (expr->symbol->ctype.modifiers & (MOD_NONLOCAL | MOD_STATIC | MOD_ADDRESSABLE))
506 return 0;
507 return 1;
508 }
509
510 void sql_select_return_states(const char *cols, struct expression *call,
511 int (*callback)(void*, int, char**, char**), void *info)
512 {
513 int row_count = 0;
514
515 if (is_fake_call(call))
516 return;
517
518 if (call->fn->type != EXPR_SYMBOL || !call->fn->symbol || is_local_symbol(call->fn)) {
519 sql_select_return_states_pointer(cols, call, callback, info);
520 return;
521 }
522
523 if (inlinable(call->fn)) {
524 mem_sql(callback, info,
525 "select %s from return_states where call_id = '%lu' order by return_id, type;",
526 cols, (unsigned long)call);
527 return;
528 }
529
530 run_sql(get_row_count, &row_count, "select count(*) from return_states where %s;",
531 get_static_filter(call->fn->symbol));
532 if (row_count > 3000)
533 return;
534
535 run_sql(callback, info, "select %s from return_states where %s order by file, return_id, type;",
536 cols, get_static_filter(call->fn->symbol));
537 }
538
539 void sql_select_call_implies(const char *cols, struct expression *call,
540 int (*callback)(void*, int, char**, char**))
541 {
542 if (call->fn->type != EXPR_SYMBOL || !call->fn->symbol)
543 return;
544
545 if (inlinable(call->fn)) {
546 mem_sql(callback, call,
547 "select %s from call_implies where call_id = '%lu';",
548 cols, (unsigned long)call);
549 return;
550 }
551
552 run_sql(callback, call, "select %s from call_implies where %s;",
553 cols, get_static_filter(call->fn->symbol));
554 }
555
556 struct select_caller_info_data {
557 struct stree *final_states;
558 struct timeval start_time;
559 int prev_func_id;
560 int ignore;
561 int results;
562 };
563
564 static int caller_info_callback(void *_data, int argc, char **argv, char **azColName);
565
566 static void sql_select_caller_info(struct select_caller_info_data *data,
567 const char *cols, struct symbol *sym)
568 {
569 if (__inline_fn) {
570 mem_sql(caller_info_callback, data,
571 "select %s from caller_info where call_id = %lu;",
572 cols, (unsigned long)__inline_fn);
573 return;
574 }
575
576 if (sym->ident->name && is_common_function(sym->ident->name))
577 return;
578 run_sql(caller_info_callback, data,
579 "select %s from common_caller_info where %s order by call_id;",
580 cols, get_static_filter(sym));
581 if (data->results)
582 return;
583
584 run_sql(caller_info_callback, data,
585 "select %s from caller_info where %s order by call_id;",
586 cols, get_static_filter(sym));
587 }
588
589 void select_caller_info_hook(void (*callback)(const char *name, struct symbol *sym, char *key, char *value), int type)
590 {
591 struct def_callback *def_callback = __alloc_def_callback(0);
592
593 def_callback->hook_type = type;
594 def_callback->callback = callback;
595 add_ptr_list(&select_caller_info_callbacks, def_callback);
596 }
597
598 /*
599 * These call backs are used when the --info option is turned on to print struct
600 * member information. For example foo->bar could have a state in
601 * smatch_extra.c and also check_user.c.
602 */
603 void add_member_info_callback(int owner, void (*callback)(struct expression *call, int param, char *printed_name, struct sm_state *sm))
604 {
605 struct member_info_callback *member_callback = __alloc_member_info_callback(0);
606
607 member_callback->owner = owner;
608 member_callback->callback = callback;
609 add_ptr_list(&member_callbacks, member_callback);
610 }
611
612 void add_split_return_callback(void (*fn)(int return_id, char *return_ranges, struct expression *returned_expr))
613 {
614 struct returned_state_callback *callback = __alloc_returned_state_callback(0);
615
616 callback->callback = fn;
617 add_ptr_list(&returned_state_callbacks, callback);
618 }
619
620 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))
621 {
622 struct returned_member_callback *member_callback = __alloc_returned_member_callback(0);
623
624 member_callback->owner = owner;
625 member_callback->callback = callback;
626 add_ptr_list(&returned_member_callbacks, member_callback);
627 }
628
629 void select_call_implies_hook(int type, void (*callback)(struct expression *call, struct expression *arg, char *key, char *value))
630 {
631 struct call_implies_callback *cb = __alloc_call_implies_callback(0);
632
633 cb->type = type;
634 cb->callback = callback;
635 add_ptr_list(&call_implies_cb_list, cb);
636 }
637
638 struct return_info {
639 struct expression *static_returns_call;
640 struct symbol *return_type;
641 struct range_list *return_range_list;
642 };
643
644 static int db_return_callback(void *_ret_info, int argc, char **argv, char **azColName)
645 {
646 struct return_info *ret_info = _ret_info;
647 struct range_list *rl;
648 struct expression *call_expr = ret_info->static_returns_call;
649
650 if (argc != 1)
651 return 0;
652 call_results_to_rl(call_expr, ret_info->return_type, argv[0], &rl);
653 ret_info->return_range_list = rl_union(ret_info->return_range_list, rl);
654 return 0;
655 }
656
657 struct range_list *db_return_vals(struct expression *expr)
658 {
659 struct return_info ret_info = {};
660 char buf[64];
661 struct sm_state *sm;
662
663 if (is_fake_call(expr))
664 return NULL;
665
666 snprintf(buf, sizeof(buf), "return %p", expr);
667 sm = get_sm_state(SMATCH_EXTRA, buf, NULL);
668 if (sm)
669 return clone_rl(estate_rl(sm->state));
670 ret_info.static_returns_call = expr;
671 ret_info.return_type = get_type(expr);
672 if (!ret_info.return_type)
673 return NULL;
674
675 if (expr->fn->type != EXPR_SYMBOL || !expr->fn->symbol)
676 return NULL;
677
678 ret_info.return_range_list = NULL;
679 if (inlinable(expr->fn)) {
680 mem_sql(db_return_callback, &ret_info,
681 "select distinct return from return_states where call_id = '%lu';",
682 (unsigned long)expr);
683 } else {
684 run_sql(db_return_callback, &ret_info,
685 "select distinct return from return_states where %s;",
686 get_static_filter(expr->fn->symbol));
687 }
688 return ret_info.return_range_list;
689 }
690
691 struct range_list *db_return_vals_from_str(const char *fn_name)
692 {
693 struct return_info ret_info;
694
695 ret_info.static_returns_call = NULL;
696 ret_info.return_type = &llong_ctype;
697 ret_info.return_range_list = NULL;
698
699 run_sql(db_return_callback, &ret_info,
700 "select distinct return from return_states where function = '%s';",
701 fn_name);
702 return ret_info.return_range_list;
703 }
704
705 static void match_call_marker(struct expression *expr)
706 {
707 struct symbol *type;
708
709 type = get_type(expr->fn);
710 if (type && type->type == SYM_PTR)
711 type = get_real_base_type(type);
712
713 /*
714 * we just want to record something in the database so that if we have
715 * two calls like: frob(4); frob(some_unkown); then on the receiving
716 * side we know that sometimes frob is called with unknown parameters.
717 */
718
719 sql_insert_caller_info(expr, INTERNAL, -1, "%call_marker%", type_to_str(type));
720 }
721
722 static char *show_offset(int offset)
723 {
724 static char buf[64];
725
726 buf[0] = '\0';
727 if (offset != -1)
728 snprintf(buf, sizeof(buf), "(-%d)", offset);
729 return buf;
730 }
731
732 static void print_struct_members(struct expression *call, struct expression *expr, int param, int offset, struct stree *stree,
733 void (*callback)(struct expression *call, int param, char *printed_name, struct sm_state *sm))
734 {
735 struct sm_state *sm;
736 char *name;
737 struct symbol *sym;
738 int len;
739 char printed_name[256];
740 int is_address = 0;
741
742 expr = strip_expr(expr);
743 if (!expr)
744 return;
745 if (expr->type == EXPR_PREOP && expr->op == '&') {
746 expr = strip_expr(expr->unop);
747 is_address = 1;
748 }
749
750 name = expr_to_var_sym(expr, &sym);
751 if (!name || !sym)
752 goto free;
753
754 len = strlen(name);
755 FOR_EACH_SM(stree, sm) {
756 if (sm->sym != sym)
757 continue;
758 if (strcmp(name, sm->name) == 0) {
759 if (is_address)
760 snprintf(printed_name, sizeof(printed_name), "*$%s", show_offset(offset));
761 else /* these are already handled. fixme: handle them here */
762 continue;
763 } else if (sm->name[0] == '*' && strcmp(name, sm->name + 1) == 0) {
764 snprintf(printed_name, sizeof(printed_name), "*$%s", show_offset(offset));
765 } else if (strncmp(name, sm->name, len) == 0) {
766 if (isalnum(sm->name[len]))
767 continue;
768 if (is_address)
769 snprintf(printed_name, sizeof(printed_name), "$%s->%s", show_offset(offset), sm->name + len + 1);
770 else
771 snprintf(printed_name, sizeof(printed_name), "$%s%s", show_offset(offset), sm->name + len);
772 } else {
773 continue;
774 }
775 callback(call, param, printed_name, sm);
776 } END_FOR_EACH_SM(sm);
777 free:
778 free_string(name);
779 }
780
781 static int param_used_callback(void *_container, int argc, char **argv, char **azColName)
782 {
783 char **container = _container;
784 static char buf[256];
785
786 snprintf(buf, sizeof(buf), "%s", argv[0]);
787 *container = buf;
788 return 0;
789 }
790
791 static void print_container_struct_members(struct expression *call, struct expression *expr, int param, struct stree *stree,
792 void (*callback)(struct expression *call, int param, char *printed_name, struct sm_state *sm))
793 {
794 struct expression *tmp;
795 char *container = NULL;
796 int offset;
797 int holder_offset;
798 char *p;
799
800 if (!call->fn || call->fn->type != EXPR_SYMBOL)
801 return;
802
803 /*
804 * We can't use the in-mem DB because we have to parse the function
805 * first, then we know if it takes a container, then we know to pass it
806 * the container data.
807 *
808 */
809 run_sql(&param_used_callback, &container,
810 "select key from call_implies where %s and type = %d and key like '%%$(%%' and parameter = %d limit 1;",
811 get_static_filter(call->fn->symbol), CONTAINER, param);
812 if (!container)
813 return;
814
815 p = strchr(container, '-');
816 if (!p)
817 return;
818 offset = atoi(p);
819 p = strchr(p, ')');
820 if (!p)
821 return;
822 p++;
823
824 tmp = get_assigned_expr(expr);
825 if (tmp)
826 expr = tmp;
827
828 if (expr->type != EXPR_PREOP || expr->op != '&')
829 return;
830 expr = strip_expr(expr->unop);
831 holder_offset = get_member_offset_from_deref(expr);
832 if (-holder_offset != offset)
833 return;
834
835 expr = strip_expr(expr->deref);
836 if (expr->type == EXPR_PREOP && expr->op == '*')
837 expr = strip_expr(expr->unop);
838
839 print_struct_members(call, expr, param, holder_offset, stree, callback);
840 }
841
842 static void match_call_info(struct expression *call)
843 {
844 struct member_info_callback *cb;
845 struct expression *arg;
846 struct stree *stree;
847 char *name;
848 int i;
849
850 name = get_fnptr_name(call->fn);
851 if (!name)
852 return;
853
854 FOR_EACH_PTR(member_callbacks, cb) {
855 stree = get_all_states_stree(cb->owner);
856 i = 0;
857 FOR_EACH_PTR(call->args, arg) {
858 print_struct_members(call, arg, i, -1, stree, cb->callback);
859 print_container_struct_members(call, arg, i, stree, cb->callback);
860 i++;
861 } END_FOR_EACH_PTR(arg);
862 free_stree(&stree);
863 } END_FOR_EACH_PTR(cb);
864
865 free_string(name);
866 }
867
868 static int get_param(int param, char **name, struct symbol **sym)
869 {
870 struct symbol *arg;
871 int i;
872
873 i = 0;
874 FOR_EACH_PTR(cur_func_sym->ctype.base_type->arguments, arg) {
875 /*
876 * this is a temporary hack to work around a bug (I think in sparse?)
877 * 2.6.37-rc1:fs/reiserfs/journal.o
878 * If there is a function definition without parameter name found
879 * after a function implementation then it causes a crash.
880 * int foo() {}
881 * int bar(char *);
882 */
883 if (arg->ident->name < (char *)100)
884 continue;
885 if (i == param) {
886 *name = arg->ident->name;
887 *sym = arg;
888 return TRUE;
889 }
890 i++;
891 } END_FOR_EACH_PTR(arg);
892
893 return FALSE;
894 }
895
896 static int function_signature_matches(const char *sig)
897 {
898 char *my_sig;
899
900 my_sig = function_signature();
901 if (!sig || !my_sig)
902 return 1; /* default to matching */
903 if (strcmp(my_sig, sig) == 0)
904 return 1;
905 return 0;
906 }
907
908 static int caller_info_callback(void *_data, int argc, char **argv, char **azColName)
909 {
910 struct select_caller_info_data *data = _data;
911 int func_id;
912 long type;
913 long param;
914 char *key;
915 char *value;
916 char *name = NULL;
917 struct symbol *sym = NULL;
918 struct def_callback *def_callback;
919 struct stree *stree;
920 struct timeval cur_time;
921
922 data->results = 1;
923
924 if (argc != 5)
925 return 0;
926
927 gettimeofday(&cur_time, NULL);
928 if (cur_time.tv_sec - data->start_time.tv_sec > 10)
929 return 0;
930
931 func_id = atoi(argv[0]);
932 errno = 0;
933 type = strtol(argv[1], NULL, 10);
934 param = strtol(argv[2], NULL, 10);
935 if (errno)
936 return 0;
937 key = argv[3];
938 value = argv[4];
939
940 if (data->prev_func_id == -1)
941 data->prev_func_id = func_id;
942 if (func_id != data->prev_func_id) {
943 stree = __pop_fake_cur_stree();
944 if (!data->ignore)
945 merge_stree(&data->final_states, stree);
946 free_stree(&stree);
947 __push_fake_cur_stree();
948 __unnullify_path();
949 data->prev_func_id = func_id;
950 data->ignore = 0;
951 }
952
953 if (data->ignore)
954 return 0;
955 if (type == INTERNAL &&
956 !function_signature_matches(value)) {
957 data->ignore = 1;
958 return 0;
959 }
960
961 if (param >= 0 && !get_param(param, &name, &sym))
962 return 0;
963
964 FOR_EACH_PTR(select_caller_info_callbacks, def_callback) {
965 if (def_callback->hook_type == type)
966 def_callback->callback(name, sym, key, value);
967 } END_FOR_EACH_PTR(def_callback);
968
969 return 0;
970 }
971
972 static struct string_list *ptr_names_done;
973 static struct string_list *ptr_names;
974
975 static int get_ptr_name(void *unused, int argc, char **argv, char **azColName)
976 {
977 insert_string(&ptr_names, alloc_string(argv[0]));
978 return 0;
979 }
980
981 static char *get_next_ptr_name(void)
982 {
983 char *ptr;
984
985 FOR_EACH_PTR(ptr_names, ptr) {
986 if (list_has_string(ptr_names_done, ptr))
987 continue;
988 insert_string(&ptr_names_done, ptr);
989 return ptr;
990 } END_FOR_EACH_PTR(ptr);
991 return NULL;
992 }
993
994 static void get_ptr_names(const char *file, const char *name)
995 {
996 char sql_filter[1024];
997 int before, after;
998
999 if (file) {
1000 snprintf(sql_filter, 1024, "file = '%s' and function = '%s';",
1001 file, name);
1002 } else {
1003 snprintf(sql_filter, 1024, "function = '%s';", name);
1004 }
1005
1006 before = ptr_list_size((struct ptr_list *)ptr_names);
1007
1008 run_sql(get_ptr_name, NULL,
1009 "select distinct ptr from function_ptr where %s",
1010 sql_filter);
1011
1012 after = ptr_list_size((struct ptr_list *)ptr_names);
1013 if (before == after)
1014 return;
1015
1016 while ((name = get_next_ptr_name()))
1017 get_ptr_names(NULL, name);
1018 }
1019
1020 static void match_data_from_db(struct symbol *sym)
1021 {
1022 struct select_caller_info_data data = { .prev_func_id = -1 };
1023 struct sm_state *sm;
1024 struct stree *stree;
1025 struct timeval end_time;
1026
1027 if (!sym || !sym->ident)
1028 return;
1029
1030 gettimeofday(&data.start_time, NULL);
1031
1032 __push_fake_cur_stree();
1033 __unnullify_path();
1034
1035 if (!__inline_fn) {
1036 char *ptr;
1037
1038 if (sym->ctype.modifiers & MOD_STATIC)
1039 get_ptr_names(get_base_file(), sym->ident->name);
1040 else
1041 get_ptr_names(NULL, sym->ident->name);
1042
1043 if (ptr_list_size((struct ptr_list *)ptr_names) > 20) {
1044 __free_ptr_list((struct ptr_list **)&ptr_names);
1045 __free_ptr_list((struct ptr_list **)&ptr_names_done);
1046 stree = __pop_fake_cur_stree();
1047 free_stree(&stree);
1048 return;
1049 }
1050
1051 sql_select_caller_info(&data,
1052 "call_id, type, parameter, key, value",
1053 sym);
1054
1055
1056 stree = __pop_fake_cur_stree();
1057 if (!data.ignore)
1058 merge_stree(&data.final_states, stree);
1059 free_stree(&stree);
1060 __push_fake_cur_stree();
1061 __unnullify_path();
1062 data.prev_func_id = -1;
1063 data.ignore = 0;
1064
1065 FOR_EACH_PTR(ptr_names, ptr) {
1066 run_sql(caller_info_callback, &data,
1067 "select call_id, type, parameter, key, value"
1068 " from common_caller_info where function = '%s' order by call_id",
1069 ptr);
1070 } END_FOR_EACH_PTR(ptr);
1071
1072 if (data.results) {
1073 FOR_EACH_PTR(ptr_names, ptr) {
1074 free_string(ptr);
1075 } END_FOR_EACH_PTR(ptr);
1076 goto free_ptr_names;
1077 }
1078
1079 FOR_EACH_PTR(ptr_names, ptr) {
1080 run_sql(caller_info_callback, &data,
1081 "select call_id, type, parameter, key, value"
1082 " from caller_info where function = '%s' order by call_id",
1083 ptr);
1084 free_string(ptr);
1085 } END_FOR_EACH_PTR(ptr);
1086
1087 free_ptr_names:
1088 __free_ptr_list((struct ptr_list **)&ptr_names);
1089 __free_ptr_list((struct ptr_list **)&ptr_names_done);
1090 } else {
1091 sql_select_caller_info(&data,
1092 "call_id, type, parameter, key, value",
1093 sym);
1094 }
1095
1096 stree = __pop_fake_cur_stree();
1097 if (!data.ignore)
1098 merge_stree(&data.final_states, stree);
1099 free_stree(&stree);
1100
1101 gettimeofday(&end_time, NULL);
1102 if (end_time.tv_sec - data.start_time.tv_sec <= 10) {
1103 FOR_EACH_SM(data.final_states, sm) {
1104 __set_sm(sm);
1105 } END_FOR_EACH_SM(sm);
1106 }
1107
1108 free_stree(&data.final_states);
1109 }
1110
1111 static int call_implies_callbacks(void *_call, int argc, char **argv, char **azColName)
1112 {
1113 struct expression *call_expr = _call;
1114 struct call_implies_callback *cb;
1115 struct expression *arg = NULL;
1116 int type;
1117 int param;
1118
1119 if (argc != 5)
1120 return 0;
1121
1122 type = atoi(argv[1]);
1123 param = atoi(argv[2]);
1124
1125 FOR_EACH_PTR(call_implies_cb_list, cb) {
1126 if (cb->type != type)
1127 continue;
1128 if (param != -1) {
1129 arg = get_argument_from_call_expr(call_expr->args, param);
1130 if (!arg)
1131 continue;
1132 }
1133 cb->callback(call_expr, arg, argv[3], argv[4]);
1134 } END_FOR_EACH_PTR(cb);
1135
1136 return 0;
1137 }
1138
1139 static void match_call_implies(struct expression *expr)
1140 {
1141 sql_select_call_implies("function, type, parameter, key, value", expr,
1142 call_implies_callbacks);
1143 }
1144
1145 static void print_initializer_list(struct expression_list *expr_list,
1146 struct symbol *struct_type)
1147 {
1148 struct expression *expr;
1149 struct symbol *base_type;
1150 char struct_name[256];
1151
1152 FOR_EACH_PTR(expr_list, expr) {
1153 if (expr->type == EXPR_INDEX && expr->idx_expression && expr->idx_expression->type == EXPR_INITIALIZER) {
1154 print_initializer_list(expr->idx_expression->expr_list, struct_type);
1155 continue;
1156 }
1157 if (expr->type != EXPR_IDENTIFIER)
1158 continue;
1159 if (!expr->expr_ident)
1160 continue;
1161 if (!expr->ident_expression || !expr->ident_expression->symbol_name)
1162 continue;
1163 base_type = get_type(expr->ident_expression);
1164 if (!base_type || base_type->type != SYM_FN)
1165 continue;
1166 snprintf(struct_name, sizeof(struct_name), "(struct %s)->%s",
1167 struct_type->ident->name, expr->expr_ident->name);
1168 sql_insert_function_ptr(expr->ident_expression->symbol_name->name,
1169 struct_name);
1170 } END_FOR_EACH_PTR(expr);
1171 }
1172
1173 static void global_variable(struct symbol *sym)
1174 {
1175 struct symbol *struct_type;
1176
1177 if (!sym->ident)
1178 return;
1179 if (!sym->initializer || sym->initializer->type != EXPR_INITIALIZER)
1180 return;
1181 struct_type = get_base_type(sym);
1182 if (!struct_type)
1183 return;
1184 if (struct_type->type == SYM_ARRAY) {
1185 struct_type = get_base_type(struct_type);
1186 if (!struct_type)
1187 return;
1188 }
1189 if (struct_type->type != SYM_STRUCT || !struct_type->ident)
1190 return;
1191 print_initializer_list(sym->initializer->expr_list, struct_type);
1192 }
1193
1194 static void match_return_info(int return_id, char *return_ranges, struct expression *expr)
1195 {
1196 sql_insert_return_states(return_id, return_ranges, INTERNAL, -1, "", function_signature());
1197 }
1198
1199 static void call_return_state_hooks_conditional(struct expression *expr)
1200 {
1201 struct returned_state_callback *cb;
1202 struct range_list *rl;
1203 char *return_ranges;
1204 int final_pass_orig = final_pass;
1205
1206 __push_fake_cur_stree();
1207
1208 final_pass = 0;
1209 __split_whole_condition(expr->conditional);
1210 final_pass = final_pass_orig;
1211
1212 if (get_implied_rl(expr->cond_true, &rl))
1213 rl = cast_rl(cur_func_return_type(), rl);
1214 else
1215 rl = cast_rl(cur_func_return_type(), alloc_whole_rl(get_type(expr->cond_true)));
1216 return_ranges = show_rl(rl);
1217 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(rl));
1218
1219 return_id++;
1220 FOR_EACH_PTR(returned_state_callbacks, cb) {
1221 cb->callback(return_id, return_ranges, expr->cond_true);
1222 } END_FOR_EACH_PTR(cb);
1223
1224 __push_true_states();
1225 __use_false_states();
1226
1227 if (get_implied_rl(expr->cond_false, &rl))
1228 rl = cast_rl(cur_func_return_type(), rl);
1229 else
1230 rl = cast_rl(cur_func_return_type(), alloc_whole_rl(get_type(expr->cond_false)));
1231 return_ranges = show_rl(rl);
1232 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(rl));
1233
1234 return_id++;
1235 FOR_EACH_PTR(returned_state_callbacks, cb) {
1236 cb->callback(return_id, return_ranges, expr->cond_false);
1237 } END_FOR_EACH_PTR(cb);
1238
1239 __merge_true_states();
1240 __free_fake_cur_stree();
1241 }
1242
1243 static void call_return_state_hooks_compare(struct expression *expr)
1244 {
1245 struct returned_state_callback *cb;
1246 char *return_ranges;
1247 int final_pass_orig = final_pass;
1248 sval_t sval = { .type = &int_ctype };
1249 sval_t ret;
1250
1251 if (!get_implied_value(expr, &ret))
1252 ret.value = -1;
1253
1254 __push_fake_cur_stree();
1255
1256 final_pass = 0;
1257 __split_whole_condition(expr);
1258 final_pass = final_pass_orig;
1259
1260 if (ret.value != 0) {
1261 return_ranges = alloc_sname("1");
1262 sval.value = 1;
1263 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_sval(sval));
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
1271 __push_true_states();
1272 __use_false_states();
1273
1274 if (ret.value != 1) {
1275 return_ranges = alloc_sname("0");
1276 sval.value = 0;
1277 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_sval(sval));
1278
1279 return_id++;
1280 FOR_EACH_PTR(returned_state_callbacks, cb) {
1281 cb->callback(return_id, return_ranges, expr);
1282 } END_FOR_EACH_PTR(cb);
1283 }
1284
1285 __merge_true_states();
1286 __free_fake_cur_stree();
1287 }
1288
1289 static int ptr_in_list(struct sm_state *sm, struct state_list *slist)
1290 {
1291 struct sm_state *tmp;
1292
1293 FOR_EACH_PTR(slist, tmp) {
1294 if (strcmp(tmp->state->name, sm->state->name) == 0)
1295 return 1;
1296 } END_FOR_EACH_PTR(tmp);
1297
1298 return 0;
1299 }
1300
1301 static char *get_return_compare_str(struct expression *expr)
1302 {
1303 char *compare_str;
1304 char *var;
1305 char buf[256];
1306 int comparison;
1307 int param;
1308
1309 compare_str = expr_lte_to_param(expr, -1);
1310 if (compare_str)
1311 return compare_str;
1312 param = get_param_num(expr);
1313 if (param < 0)
1314 return NULL;
1315
1316 var = expr_to_var(expr);
1317 if (!var)
1318 return NULL;
1319 snprintf(buf, sizeof(buf), "%s orig", var);
1320 comparison = get_comparison_strings(var, buf);
1321 free_string(var);
1322
1323 if (!comparison)
1324 return NULL;
1325
1326 snprintf(buf, sizeof(buf), "[%s$%d]", show_special(comparison), param);
1327 return alloc_sname(buf);
1328 }
1329
1330 static int split_possible_helper(struct sm_state *sm, struct expression *expr)
1331 {
1332 struct returned_state_callback *cb;
1333 struct range_list *rl;
1334 char *return_ranges;
1335 struct sm_state *tmp;
1336 int ret = 0;
1337 int nr_possible, nr_states;
1338 char *compare_str = NULL;
1339 char buf[128];
1340 struct state_list *already_handled = NULL;
1341
1342 if (!sm || !sm->merged)
1343 return 0;
1344
1345 if (too_many_possible(sm))
1346 return 0;
1347
1348 /* bail if it gets too complicated */
1349 nr_possible = ptr_list_size((struct ptr_list *)sm->possible);
1350 nr_states = stree_count(__get_cur_stree());
1351 if (nr_states * nr_possible >= 2000)
1352 return 0;
1353
1354 FOR_EACH_PTR(sm->possible, tmp) {
1355 if (tmp->merged)
1356 continue;
1357 if (ptr_in_list(tmp, already_handled))
1358 continue;
1359 add_ptr_list(&already_handled, tmp);
1360
1361 ret = 1;
1362 __push_fake_cur_stree();
1363
1364 overwrite_states_using_pool(sm, tmp);
1365
1366 rl = cast_rl(cur_func_return_type(), estate_rl(tmp->state));
1367 return_ranges = show_rl(rl);
1368 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(clone_rl(rl)));
1369 compare_str = get_return_compare_str(expr);
1370 if (compare_str) {
1371 snprintf(buf, sizeof(buf), "%s%s", return_ranges, compare_str);
1372 return_ranges = alloc_sname(buf);
1373 }
1374
1375 return_id++;
1376 FOR_EACH_PTR(returned_state_callbacks, cb) {
1377 cb->callback(return_id, return_ranges, expr);
1378 } END_FOR_EACH_PTR(cb);
1379
1380 __free_fake_cur_stree();
1381 } END_FOR_EACH_PTR(tmp);
1382
1383 free_slist(&already_handled);
1384
1385 return ret;
1386 }
1387
1388 static int call_return_state_hooks_split_possible(struct expression *expr)
1389 {
1390 struct sm_state *sm;
1391
1392 if (!expr || expr_equal_to_param(expr, -1))
1393 return 0;
1394
1395 sm = get_sm_state_expr(SMATCH_EXTRA, expr);
1396 return split_possible_helper(sm, expr);
1397 }
1398
1399 static const char *get_return_ranges_str(struct expression *expr, struct range_list **rl_p)
1400 {
1401 struct range_list *rl;
1402 char *return_ranges;
1403 sval_t sval;
1404 char *compare_str;
1405 char *math_str;
1406 char buf[128];
1407
1408 *rl_p = NULL;
1409
1410 if (!expr)
1411 return alloc_sname("");
1412
1413 if (get_implied_value(expr, &sval)) {
1414 sval = sval_cast(cur_func_return_type(), sval);
1415 *rl_p = alloc_rl(sval, sval);
1416 return sval_to_str(sval);
1417 }
1418
1419 compare_str = expr_equal_to_param(expr, -1);
1420 math_str = get_value_in_terms_of_parameter_math(expr);
1421
1422 if (get_implied_rl(expr, &rl)) {
1423 rl = cast_rl(cur_func_return_type(), rl);
1424 return_ranges = show_rl(rl);
1425 } else if (get_imaginary_absolute(expr, &rl)){
1426 rl = cast_rl(cur_func_return_type(), rl);
1427 return alloc_sname(show_rl(rl));
1428 } else {
1429 rl = cast_rl(cur_func_return_type(), alloc_whole_rl(get_type(expr)));
1430 return_ranges = show_rl(rl);
1431 }
1432 *rl_p = rl;
1433
1434 if (compare_str) {
1435 snprintf(buf, sizeof(buf), "%s%s", return_ranges, compare_str);
1436 return alloc_sname(buf);
1437 }
1438 if (math_str) {
1439 snprintf(buf, sizeof(buf), "%s[%s]", return_ranges, math_str);
1440 return alloc_sname(buf);
1441 }
1442 compare_str = get_return_compare_str(expr);
1443 if (compare_str) {
1444 snprintf(buf, sizeof(buf), "%s%s", return_ranges, compare_str);
1445 return alloc_sname(buf);
1446 }
1447
1448 return return_ranges;
1449 }
1450
1451 static int split_positive_from_negative(struct expression *expr)
1452 {
1453 struct returned_state_callback *cb;
1454 struct range_list *rl;
1455 const char *return_ranges;
1456 struct range_list *ret_rl;
1457 int undo;
1458
1459 /* We're going to print the states 3 times */
1460 if (stree_count(__get_cur_stree()) > 10000 / 3)
1461 return 0;
1462
1463 if (!get_implied_rl(expr, &rl) || !rl)
1464 return 0;
1465 if (is_whole_rl(rl) || is_whole_rl_non_zero(rl))
1466 return 0;
1467 /* Forget about INT_MAX and larger */
1468 if (rl_max(rl).value <= 0)
1469 return 0;
1470 if (!sval_is_negative(rl_min(rl)))
1471 return 0;
1472
1473 if (!assume(compare_expression(expr, '>', zero_expr())))
1474 return 0;
1475
1476 return_id++;
1477 return_ranges = get_return_ranges_str(expr, &ret_rl);
1478 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));
1479 FOR_EACH_PTR(returned_state_callbacks, cb) {
1480 cb->callback(return_id, (char *)return_ranges, expr);
1481 } END_FOR_EACH_PTR(cb);
1482
1483 end_assume();
1484
1485 if (rl_has_sval(rl, sval_type_val(rl_type(rl), 0))) {
1486 undo = assume(compare_expression(expr, SPECIAL_EQUAL, zero_expr()));
1487
1488 return_id++;
1489 return_ranges = get_return_ranges_str(expr, &ret_rl);
1490 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));
1491 FOR_EACH_PTR(returned_state_callbacks, cb) {
1492 cb->callback(return_id, (char *)return_ranges, expr);
1493 } END_FOR_EACH_PTR(cb);
1494
1495 if (undo)
1496 end_assume();
1497 }
1498
1499 undo = assume(compare_expression(expr, '<', zero_expr()));
1500
1501 return_id++;
1502 return_ranges = get_return_ranges_str(expr, &ret_rl);
1503 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));
1504 FOR_EACH_PTR(returned_state_callbacks, cb) {
1505 cb->callback(return_id, (char *)return_ranges, expr);
1506 } END_FOR_EACH_PTR(cb);
1507
1508 if (undo)
1509 end_assume();
1510
1511 return 1;
1512 }
1513
1514 static int call_return_state_hooks_split_null_non_null(struct expression *expr)
1515 {
1516 struct returned_state_callback *cb;
1517 struct range_list *rl;
1518 struct range_list *nonnull_rl;
1519 sval_t null_sval;
1520 struct range_list *null_rl = NULL;
1521 char *return_ranges;
1522 struct sm_state *sm;
1523 struct smatch_state *state;
1524 int nr_states;
1525 int final_pass_orig = final_pass;
1526
1527 if (!expr || expr_equal_to_param(expr, -1))
1528 return 0;
1529 if (expr->type == EXPR_CALL)
1530 return 0;
1531 if (!is_pointer(expr))
1532 return 0;
1533
1534 sm = get_sm_state_expr(SMATCH_EXTRA, expr);
1535 if (!sm)
1536 return 0;
1537 if (ptr_list_size((struct ptr_list *)sm->possible) == 1)
1538 return 0;
1539 state = sm->state;
1540 if (!estate_rl(state))
1541 return 0;
1542 if (estate_min(state).value == 0 && estate_max(state).value == 0)
1543 return 0;
1544 if (!rl_has_sval(estate_rl(state), sval_type_val(estate_type(state), 0)))
1545 return 0;
1546
1547 nr_states = stree_count(__get_cur_stree());
1548 if (option_info && nr_states >= 1500)
1549 return 0;
1550
1551 rl = estate_rl(state);
1552
1553 __push_fake_cur_stree();
1554
1555 final_pass = 0;
1556 __split_whole_condition(expr);
1557 final_pass = final_pass_orig;
1558
1559 nonnull_rl = rl_filter(rl, rl_zero());
1560 return_ranges = show_rl(nonnull_rl);
1561 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(nonnull_rl));
1562
1563 return_id++;
1564 FOR_EACH_PTR(returned_state_callbacks, cb) {
1565 cb->callback(return_id, return_ranges, expr);
1566 } END_FOR_EACH_PTR(cb);
1567
1568 __push_true_states();
1569 __use_false_states();
1570
1571 return_ranges = alloc_sname("0");
1572 null_sval = sval_type_val(rl_type(rl), 0);
1573 add_range(&null_rl, null_sval, null_sval);
1574 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(null_rl));
1575 return_id++;
1576 FOR_EACH_PTR(returned_state_callbacks, cb) {
1577 cb->callback(return_id, return_ranges, expr);
1578 } END_FOR_EACH_PTR(cb);
1579
1580 __merge_true_states();
1581 __free_fake_cur_stree();
1582
1583 return 1;
1584 }
1585
1586 static int call_return_state_hooks_split_success_fail(struct expression *expr)
1587 {
1588 struct range_list *rl;
1589 struct range_list *nonzero_rl;
1590 sval_t zero_sval;
1591 struct range_list *zero_rl = NULL;
1592 int nr_states;
1593 struct returned_state_callback *cb;
1594 char *return_ranges;
1595 int final_pass_orig = final_pass;
1596 sval_t val;
1597
1598 if (option_project != PROJ_KERNEL)
1599 return 0;
1600
1601 nr_states = stree_count(__get_cur_stree());
1602 if (nr_states > 1500)
1603 return 0;
1604
1605 if (get_value(expr, &val))
1606 return 0;
1607 if (!get_implied_rl(expr, &rl))
1608 return 0;
1609 if (rl_min(rl).value < -4095 || rl_min(rl).value >= 0)
1610 return 0;
1611 if (rl_max(rl).value != 0)
1612 return 0;
1613
1614 __push_fake_cur_stree();
1615
1616 final_pass = 0;
1617 __split_whole_condition(expr);
1618 final_pass = final_pass_orig;
1619
1620 nonzero_rl = rl_filter(rl, rl_zero());
1621 return_ranges = show_rl(nonzero_rl);
1622 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(nonzero_rl));
1623
1624 return_id++;
1625 FOR_EACH_PTR(returned_state_callbacks, cb) {
1626 cb->callback(return_id, return_ranges, expr);
1627 } END_FOR_EACH_PTR(cb);
1628
1629 __push_true_states();
1630 __use_false_states();
1631
1632 return_ranges = alloc_sname("0");
1633 zero_sval = sval_type_val(rl_type(rl), 0);
1634 add_range(&zero_rl, zero_sval, zero_sval);
1635 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(zero_rl));
1636 return_id++;
1637 FOR_EACH_PTR(returned_state_callbacks, cb) {
1638 cb->callback(return_id, return_ranges, expr);
1639 } END_FOR_EACH_PTR(cb);
1640
1641 __merge_true_states();
1642 __free_fake_cur_stree();
1643
1644 return 1;
1645 }
1646
1647 static int is_boolean(struct expression *expr)
1648 {
1649 struct range_list *rl;
1650
1651 if (!get_implied_rl(expr, &rl))
1652 return 0;
1653 if (rl_min(rl).value == 0 && rl_max(rl).value == 1)
1654 return 1;
1655 return 0;
1656 }
1657
1658 static int is_conditional(struct expression *expr)
1659 {
1660 if (!expr)
1661 return 0;
1662 if (expr->type == EXPR_CONDITIONAL || expr->type == EXPR_SELECT)
1663 return 1;
1664 return 0;
1665 }
1666
1667 static int splitable_function_call(struct expression *expr)
1668 {
1669 struct sm_state *sm;
1670 char buf[64];
1671
1672 if (!expr || expr->type != EXPR_CALL)
1673 return 0;
1674 snprintf(buf, sizeof(buf), "return %p", expr);
1675 sm = get_sm_state(SMATCH_EXTRA, buf, NULL);
1676 return split_possible_helper(sm, expr);
1677 }
1678
1679 static struct sm_state *find_bool_param(void)
1680 {
1681 struct stree *start_states;
1682 struct symbol *arg;
1683 struct sm_state *sm, *tmp;
1684 sval_t sval;
1685
1686 start_states = get_start_states();
1687
1688 FOR_EACH_PTR_REVERSE(cur_func_sym->ctype.base_type->arguments, arg) {
1689 if (!arg->ident)
1690 continue;
1691 sm = get_sm_state_stree(start_states, SMATCH_EXTRA, arg->ident->name, arg);
1692 if (!sm)
1693 continue;
1694 if (rl_min(estate_rl(sm->state)).value != 0 ||
1695 rl_max(estate_rl(sm->state)).value != 1)
1696 continue;
1697 goto found;
1698 } END_FOR_EACH_PTR_REVERSE(arg);
1699
1700 return NULL;
1701
1702 found:
1703 /*
1704 * Check if it's splitable. If not, then splitting it up is likely not
1705 * useful for the callers.
1706 */
1707 FOR_EACH_PTR(sm->possible, tmp) {
1708 if (is_merged(tmp))
1709 continue;
1710 if (!estate_get_single_value(tmp->state, &sval))
1711 return NULL;
1712 } END_FOR_EACH_PTR(tmp);
1713
1714 return sm;
1715 }
1716
1717 static int split_on_bool_sm(struct sm_state *sm, struct expression *expr)
1718 {
1719 struct returned_state_callback *cb;
1720 struct range_list *ret_rl;
1721 const char *return_ranges;
1722 struct sm_state *tmp;
1723 int ret = 0;
1724 int nr_possible, nr_states;
1725 char *compare_str = NULL;
1726 char buf[128];
1727 struct state_list *already_handled = NULL;
1728
1729 if (!sm || !sm->merged)
1730 return 0;
1731
1732 if (too_many_possible(sm))
1733 return 0;
1734
1735 /* bail if it gets too complicated */
1736 nr_possible = ptr_list_size((struct ptr_list *)sm->possible);
1737 nr_states = stree_count(__get_cur_stree());
1738 if (nr_states * nr_possible >= 2000)
1739 return 0;
1740
1741 FOR_EACH_PTR(sm->possible, tmp) {
1742 if (tmp->merged)
1743 continue;
1744 if (ptr_in_list(tmp, already_handled))
1745 continue;
1746 add_ptr_list(&already_handled, tmp);
1747
1748 ret = 1;
1749 __push_fake_cur_stree();
1750
1751 overwrite_states_using_pool(sm, tmp);
1752
1753 return_ranges = get_return_ranges_str(expr, &ret_rl);
1754 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));
1755 compare_str = get_return_compare_str(expr);
1756 if (compare_str) {
1757 snprintf(buf, sizeof(buf), "%s%s", return_ranges, compare_str);
1758 return_ranges = alloc_sname(buf);
1759 }
1760
1761 return_id++;
1762 FOR_EACH_PTR(returned_state_callbacks, cb) {
1763 cb->callback(return_id, (char *)return_ranges, expr);
1764 } END_FOR_EACH_PTR(cb);
1765
1766 __free_fake_cur_stree();
1767 } END_FOR_EACH_PTR(tmp);
1768
1769 free_slist(&already_handled);
1770
1771 return ret;
1772 }
1773
1774 static int split_by_bool_param(struct expression *expr)
1775 {
1776 struct sm_state *start_sm, *sm;
1777 sval_t sval;
1778
1779 start_sm = find_bool_param();
1780 if (!start_sm)
1781 return 0;
1782 sm = get_sm_state(SMATCH_EXTRA, start_sm->name, start_sm->sym);
1783 if (!sm || estate_get_single_value(sm->state, &sval))
1784 return 0;
1785 return split_on_bool_sm(sm, expr);
1786 }
1787
1788 static int split_by_null_nonnull_param(struct expression *expr)
1789 {
1790 struct symbol *arg;
1791 struct sm_state *sm;
1792 sval_t zero = {
1793 .type = &ulong_ctype,
1794 };
1795
1796 /* function must only take one pointer */
1797 if (ptr_list_size((struct ptr_list *)cur_func_sym->ctype.base_type->arguments) != 1)
1798 return 0;
1799 arg = first_ptr_list((struct ptr_list *)cur_func_sym->ctype.base_type->arguments);
1800 if (!arg->ident)
1801 return 0;
1802 if (get_real_base_type(arg)->type != SYM_PTR)
1803 return 0;
1804
1805 if (param_was_set_var_sym(arg->ident->name, arg))
1806 return 0;
1807 sm = get_sm_state(SMATCH_EXTRA, arg->ident->name, arg);
1808 if (!sm)
1809 return 0;
1810
1811 if (!rl_has_sval(estate_rl(sm->state), zero))
1812 return 0;
1813
1814 return split_on_bool_sm(sm, expr);
1815 }
1816
1817 struct expression *strip_expr_statement(struct expression *expr)
1818 {
1819 struct expression *orig = expr;
1820 struct statement *stmt, *last_stmt;
1821
1822 if (!expr)
1823 return NULL;
1824 if (expr->type == EXPR_PREOP && expr->op == '(')
1825 expr = expr->unop;
1826 if (expr->type != EXPR_STATEMENT)
1827 return orig;
1828 stmt = expr->statement;
1829 if (!stmt || stmt->type != STMT_COMPOUND)
1830 return orig;
1831
1832 last_stmt = last_ptr_list((struct ptr_list *)stmt->stmts);
1833 if (!last_stmt || last_stmt->type == STMT_LABEL)
1834 last_stmt = last_stmt->label_statement;
1835 if (!last_stmt || last_stmt->type != STMT_EXPRESSION)
1836 return orig;
1837 return strip_expr(last_stmt->expression);
1838 }
1839
1840 static void call_return_state_hooks(struct expression *expr)
1841 {
1842 struct returned_state_callback *cb;
1843 struct range_list *ret_rl;
1844 const char *return_ranges;
1845 int nr_states;
1846 sval_t sval;
1847
1848 if (__path_is_null())
1849 return;
1850
1851 expr = strip_expr(expr);
1852 expr = strip_expr_statement(expr);
1853
1854 if (is_impossible_path())
1855 goto vanilla;
1856
1857 if (expr && (expr->type == EXPR_COMPARE ||
1858 !get_implied_value(expr, &sval)) &&
1859 (is_condition(expr) || is_boolean(expr))) {
1860 call_return_state_hooks_compare(expr);
1861 return;
1862 } else if (is_conditional(expr)) {
1863 call_return_state_hooks_conditional(expr);
1864 return;
1865 } else if (call_return_state_hooks_split_possible(expr)) {
1866 return;
1867 } else if (call_return_state_hooks_split_null_non_null(expr)) {
1868 return;
1869 } else if (call_return_state_hooks_split_success_fail(expr)) {
1870 return;
1871 } else if (splitable_function_call(expr)) {
1872 return;
1873 } else if (split_positive_from_negative(expr)) {
1874 return;
1875 } else if (split_by_bool_param(expr)) {
1876 } else if (split_by_null_nonnull_param(expr)) {
1877 return;
1878 }
1879
1880 vanilla:
1881 return_ranges = get_return_ranges_str(expr, &ret_rl);
1882 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));
1883
1884 return_id++;
1885 nr_states = stree_count(__get_cur_stree());
1886 if (nr_states >= 10000) {
1887 match_return_info(return_id, (char *)return_ranges, expr);
1888 return;
1889 }
1890 FOR_EACH_PTR(returned_state_callbacks, cb) {
1891 cb->callback(return_id, (char *)return_ranges, expr);
1892 } END_FOR_EACH_PTR(cb);
1893 }
1894
1895 static void print_returned_struct_members(int return_id, char *return_ranges, struct expression *expr)
1896 {
1897 struct returned_member_callback *cb;
1898 struct stree *stree;
1899 struct sm_state *sm;
1900 struct symbol *type;
1901 char *name;
1902 char member_name[256];
1903 int len;
1904
1905 type = get_type(expr);
1906 if (!type || type->type != SYM_PTR)
1907 return;
1908 name = expr_to_var(expr);
1909 if (!name)
1910 return;
1911
1912 member_name[sizeof(member_name) - 1] = '\0';
1913 strcpy(member_name, "$");
1914
1915 len = strlen(name);
1916 FOR_EACH_PTR(returned_member_callbacks, cb) {
1917 stree = __get_cur_stree();
1918 FOR_EACH_MY_SM(cb->owner, stree, sm) {
1919 if (sm->name[0] == '*' && strcmp(sm->name + 1, name) == 0) {
1920 strcpy(member_name, "*$");
1921 cb->callback(return_id, return_ranges, expr, member_name, sm->state);
1922 continue;
1923 }
1924 if (strncmp(sm->name, name, len) != 0)
1925 continue;
1926 if (strncmp(sm->name + len, "->", 2) != 0)
1927 continue;
1928 snprintf(member_name, sizeof(member_name), "$%s", sm->name + len);
1929 cb->callback(return_id, return_ranges, expr, member_name, sm->state);
1930 } END_FOR_EACH_SM(sm);
1931 } END_FOR_EACH_PTR(cb);
1932
1933 free_string(name);
1934 }
1935
1936 static void reset_memdb(struct symbol *sym)
1937 {
1938 mem_sql(NULL, NULL, "delete from caller_info;");
1939 mem_sql(NULL, NULL, "delete from return_states;");
1940 mem_sql(NULL, NULL, "delete from call_implies;");
1941 }
1942
1943 static void match_end_func_info(struct symbol *sym)
1944 {
1945 if (__path_is_null())
1946 return;
1947 call_return_state_hooks(NULL);
1948 }
1949
1950 static void match_after_func(struct symbol *sym)
1951 {
1952 if (!__inline_fn)
1953 reset_memdb(sym);
1954 }
1955
1956 static void init_memdb(void)
1957 {
1958 char *err = NULL;
1959 int rc;
1960 const char *schema_files[] = {
1961 "db/db.schema",
1962 "db/caller_info.schema",
1963 "db/return_states.schema",
1964 "db/function_type_size.schema",
1965 "db/type_size.schema",
1966 "db/call_implies.schema",
1967 "db/function_ptr.schema",
1968 "db/local_values.schema",
1969 "db/function_type_value.schema",
1970 "db/type_value.schema",
1971 "db/function_type.schema",
1972 "db/data_info.schema",
1973 "db/parameter_name.schema",
1974 "db/constraints.schema",
1975 "db/constraints_required.schema",
1976 "db/fn_ptr_data_link.schema",
1977 "db/fn_data_link.schema",
1978 "db/mtag_about.schema",
1979 "db/mtag_map.schema",
1980 "db/mtag_data.schema",
1981 "db/mtag_alias.schema",
1982 };
1983 static char buf[4096];
1984 int fd;
1985 int ret;
1986 int i;
1987
1988 rc = sqlite3_open(":memory:", &mem_db);
1989 if (rc != SQLITE_OK) {
1990 printf("Error starting In-Memory database.");
1991 return;
1992 }
1993
1994 for (i = 0; i < ARRAY_SIZE(schema_files); i++) {
1995 fd = open_data_file(schema_files[i]);
1996 if (fd < 0) {
1997 printf("failed to open: %s\n", schema_files[i]);
1998 continue;
1999 }
2000 ret = read(fd, buf, sizeof(buf));
2001 if (ret < 0) {
2002 printf("failed to read: %s\n", schema_files[i]);
2003 continue;
2004 }
2005 close(fd);
2006 if (ret == sizeof(buf)) {
2007 printf("Schema file too large: %s (limit %zd bytes)",
2008 schema_files[i], sizeof(buf));
2009 continue;
2010 }
2011 buf[ret] = '\0';
2012 rc = sqlite3_exec(mem_db, buf, NULL, NULL, &err);
2013 if (rc != SQLITE_OK) {
2014 fprintf(stderr, "SQL error #2: %s\n", err);
2015 fprintf(stderr, "%s\n", buf);
2016 }
2017 }
2018 }
2019
2020 void open_smatch_db(void)
2021 {
2022 int rc;
2023
2024 if (option_no_db)
2025 return;
2026
2027 init_memdb();
2028
2029 rc = sqlite3_open_v2("smatch_db.sqlite", &db, SQLITE_OPEN_READONLY, NULL);
2030 if (rc != SQLITE_OK) {
2031 option_no_db = 1;
2032 return;
2033 }
2034 return;
2035 }
2036
2037 static void register_common_funcs(void)
2038 {
2039 struct token *token;
2040 char *func;
2041 char filename[256];
2042
2043 if (option_project == PROJ_NONE)
2044 strcpy(filename, "common_functions");
2045 else
2046 snprintf(filename, 256, "%s.common_functions", option_project_str);
2047
2048 token = get_tokens_file(filename);
2049 if (!token)
2050 return;
2051 if (token_type(token) != TOKEN_STREAMBEGIN)
2052 return;
2053 token = token->next;
2054 while (token_type(token) != TOKEN_STREAMEND) {
2055 if (token_type(token) != TOKEN_IDENT)
2056 return;
2057 func = alloc_string(show_ident(token->ident));
2058 add_ptr_list(&common_funcs, func);
2059 token = token->next;
2060 }
2061 clear_token_alloc();
2062 }
2063
2064 static char *get_next_string(char **str)
2065 {
2066 static char string[256];
2067 char *start;
2068 char *p = *str;
2069 int len;
2070
2071 if (*p == '\0')
2072 return NULL;
2073 start = p;
2074
2075 while (*p != '\0' && *p != ' ' && *p != '\n')
2076 p++;
2077
2078 len = p - start;
2079 if (len > 256) {
2080 memcpy(string, start, 255);
2081 string[255] = '\0';
2082 printf("return_fix: '%s' too long", string);
2083 **str = '\0';
2084 return NULL;
2085 }
2086 memcpy(string, start, len);
2087 string[len] = '\0';
2088 if (*p != '\0')
2089 p++;
2090 *str = p;
2091 return string;
2092 }
2093
2094 static void register_return_replacements(void)
2095 {
2096 char *func, *orig, *new;
2097 char filename[256];
2098 char buf[4096];
2099 int fd, ret, i;
2100 char *p;
2101
2102 snprintf(filename, 256, "db/%s.return_fixes", option_project_str);
2103 fd = open_data_file(filename);
2104 if (fd < 0)
2105 return;
2106 ret = read(fd, buf, sizeof(buf));
2107 close(fd);
2108 if (ret < 0)
2109 return;
2110 if (ret == sizeof(buf)) {
2111 printf("file too large: %s (limit %zd bytes)",
2112 filename, sizeof(buf));
2113 return;
2114 }
2115 buf[ret] = '\0';
2116
2117 p = buf;
2118 while (*p) {
2119 get_next_string(&p);
2120 replace_count++;
2121 }
2122 if (replace_count == 0 || replace_count % 3 != 0) {
2123 replace_count = 0;
2124 return;
2125 }
2126 replace_table = malloc(replace_count * sizeof(char *));
2127
2128 p = buf;
2129 i = 0;
2130 while (*p) {
2131 func = alloc_string(get_next_string(&p));
2132 orig = alloc_string(get_next_string(&p));
2133 new = alloc_string(get_next_string(&p));
2134
2135 replace_table[i++] = func;
2136 replace_table[i++] = orig;
2137 replace_table[i++] = new;
2138 }
2139 }
2140
2141 void register_definition_db_callbacks(int id)
2142 {
2143 add_hook(&match_call_info, FUNCTION_CALL_HOOK);
2144 add_hook(&global_variable, BASE_HOOK);
2145 add_hook(&global_variable, DECLARATION_HOOK);
2146 add_split_return_callback(match_return_info);
2147 add_split_return_callback(print_returned_struct_members);
2148 add_hook(&call_return_state_hooks, RETURN_HOOK);
2149 add_hook(&match_end_func_info, END_FUNC_HOOK);
2150 add_hook(&match_after_func, AFTER_FUNC_HOOK);
2151
2152 add_hook(&match_data_from_db, FUNC_DEF_HOOK);
2153 add_hook(&match_call_implies, CALL_HOOK_AFTER_INLINE);
2154
2155 register_common_funcs();
2156 register_return_replacements();
2157 }
2158
2159 void register_db_call_marker(int id)
2160 {
2161 add_hook(&match_call_marker, FUNCTION_CALL_HOOK);
2162 }
2163
2164 char *return_state_to_var_sym(struct expression *expr, int param, const char *key, struct symbol **sym)
2165 {
2166 struct expression *arg;
2167 char *name = NULL;
2168 char member_name[256];
2169
2170 *sym = NULL;
2171
2172 if (param == -1) {
2173 const char *star = "";
2174
2175 if (expr->type != EXPR_ASSIGNMENT)
2176 return NULL;
2177 name = expr_to_var_sym(expr->left, sym);
2178 if (!name)
2179 return NULL;
2180 if (key[0] == '*') {
2181 star = "*";
2182 key++;
2183 }
2184 if (strncmp(key, "$", 1) != 0)
2185 return name;
2186 snprintf(member_name, sizeof(member_name), "%s%s%s", star, name, key + 1);
2187 free_string(name);
2188 return alloc_string(member_name);
2189 }
2190
2191 while (expr->type == EXPR_ASSIGNMENT)
2192 expr = strip_expr(expr->right);
2193 if (expr->type != EXPR_CALL)
2194 return NULL;
2195
2196 arg = get_argument_from_call_expr(expr->args, param);
2197 if (!arg)
2198 return NULL;
2199
2200 return get_variable_from_key(arg, key, sym);
2201 }
2202
2203 char *get_variable_from_key(struct expression *arg, const char *key, struct symbol **sym)
2204 {
2205 char buf[256];
2206 char *tmp;
2207
2208 if (!arg)
2209 return NULL;
2210
2211 arg = strip_expr(arg);
2212
2213 if (strcmp(key, "$") == 0)
2214 return expr_to_var_sym(arg, sym);
2215
2216 if (strcmp(key, "*$") == 0) {
2217 if (arg->type == EXPR_PREOP && arg->op == '&') {
2218 arg = strip_expr(arg->unop);
2219 return expr_to_var_sym(arg, sym);
2220 } else {
2221 tmp = expr_to_var_sym(arg, sym);
2222 if (!tmp)
2223 return NULL;
2224 snprintf(buf, sizeof(buf), "*%s", tmp);
2225 free_string(tmp);
2226 return alloc_string(buf);
2227 }
2228 }
2229
2230 if (arg->type == EXPR_PREOP && arg->op == '&') {
2231 arg = strip_expr(arg->unop);
2232 tmp = expr_to_var_sym(arg, sym);
2233 if (!tmp)
2234 return NULL;
2235 snprintf(buf, sizeof(buf), "%s.%s", tmp, key + 3);
2236 return alloc_string(buf);
2237 }
2238
2239 tmp = expr_to_var_sym(arg, sym);
2240 if (!tmp)
2241 return NULL;
2242 snprintf(buf, sizeof(buf), "%s%s", tmp, key + 1);
2243 free_string(tmp);
2244 return alloc_string(buf);
2245 }
2246
2247 char *get_chunk_from_key(struct expression *arg, char *key, struct symbol **sym, struct var_sym_list **vsl)
2248 {
2249 *vsl = NULL;
2250
2251 if (strcmp("$", key) == 0)
2252 return expr_to_chunk_sym_vsl(arg, sym, vsl);
2253 return get_variable_from_key(arg, key, sym);
2254 }
2255
2256 const char *state_name_to_param_name(const char *state_name, const char *param_name)
2257 {
2258 int name_len;
2259 static char buf[256];
2260
2261 name_len = strlen(param_name);
2262
2263 if (strcmp(state_name, param_name) == 0) {
2264 return "$";
2265 } else if (state_name[name_len] == '-' && /* check for '-' from "->" */
2266 strncmp(state_name, param_name, name_len) == 0) {
2267 snprintf(buf, sizeof(buf), "$%s", state_name + name_len);
2268 return buf;
2269 } else if (state_name[0] == '*' && strcmp(state_name + 1, param_name) == 0) {
2270 return "*$";
2271 }
2272 return NULL;
2273 }
2274
2275 const char *get_param_name_var_sym(const char *name, struct symbol *sym)
2276 {
2277 if (!sym || !sym->ident)
2278 return NULL;
2279
2280 return state_name_to_param_name(name, sym->ident->name);
2281 }
2282
2283 const char *get_mtag_name_var_sym(const char *state_name, struct symbol *sym)
2284 {
2285 struct symbol *type;
2286 const char *sym_name;
2287 int name_len;
2288 static char buf[256];
2289
2290 /*
2291 * mtag_name is different from param_name because mtags can be a struct
2292 * instead of a struct pointer. But we want to treat it like a pointer
2293 * because really an mtag is a pointer. Or in other words, if you pass
2294 * a struct foo then you want to talk about foo.bar but with an mtag
2295 * you want to refer to it as foo->bar.
2296 *
2297 */
2298
2299 if (!sym || !sym->ident)
2300 return NULL;
2301
2302 type = get_real_base_type(sym);
2303 if (type && type->type == SYM_BASETYPE)
2304 return "*$";
2305
2306 sym_name = sym->ident->name;
2307 name_len = strlen(sym_name);
2308
2309 if (state_name[name_len] == '.' && /* check for '-' from "->" */
2310 strncmp(state_name, sym_name, name_len) == 0) {
2311 snprintf(buf, sizeof(buf), "$->%s", state_name + name_len + 1);
2312 return buf;
2313 }
2314
2315 return state_name_to_param_name(state_name, sym_name);
2316 }
2317
2318 const char *get_mtag_name_expr(struct expression *expr)
2319 {
2320 char *name;
2321 struct symbol *sym;
2322 const char *ret = NULL;
2323
2324 name = expr_to_var_sym(expr, &sym);
2325 if (!name || !sym)
2326 goto free;
2327
2328 ret = get_mtag_name_var_sym(name, sym);
2329 free:
2330 free_string(name);
2331 return ret;
2332 }
2333
2334 const char *get_param_name(struct sm_state *sm)
2335 {
2336 return get_param_name_var_sym(sm->name, sm->sym);
2337 }
2338
2339 char *get_data_info_name(struct expression *expr)
2340 {
2341 struct symbol *sym;
2342 char *name;
2343 char buf[256];
2344 char *ret = NULL;
2345
2346 expr = strip_expr(expr);
2347 name = get_member_name(expr);
2348 if (name)
2349 return name;
2350 name = expr_to_var_sym(expr, &sym);
2351 if (!name || !sym)
2352 goto free;
2353 if (!(sym->ctype.modifiers & MOD_TOPLEVEL))
2354 goto free;
2355 if (sym->ctype.modifiers & MOD_STATIC)
2356 snprintf(buf, sizeof(buf), "static %s", name);
2357 else
2358 snprintf(buf, sizeof(buf), "global %s", name);
2359 ret = alloc_sname(buf);
2360 free:
2361 free_string(name);
2362 return ret;
2363 }
Static analysis for C