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db: save less information for common functions
[smatch.git] / smatch_db.c
blob75e37bc333db18fdca5fdc38d84ebdca8ad8fce7
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, 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: insert %sinto " #table " values(", \
61 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, values);
69 #define sql_insert_or_ignore(table, values...) sql_insert_helper(table, 1, values);
70
71 struct def_callback {
72 int hook_type;
73 void (*callback)(const char *name, struct symbol *sym, char *key, char *value);
74 };
75 ALLOCATOR(def_callback, "definition db hook callbacks");
76 DECLARE_PTR_LIST(callback_list, struct def_callback);
77 static struct callback_list *select_caller_info_callbacks;
78
79 struct member_info_callback {
80 int owner;
81 void (*callback)(struct expression *call, int param, char *printed_name, struct sm_state *sm);
82 };
83 ALLOCATOR(member_info_callback, "caller_info callbacks");
84 DECLARE_PTR_LIST(member_info_cb_list, struct member_info_callback);
85 static struct member_info_cb_list *member_callbacks;
86
87 struct returned_state_callback {
88 void (*callback)(int return_id, char *return_ranges, struct expression *return_expr);
89 };
90 ALLOCATOR(returned_state_callback, "returned state callbacks");
91 DECLARE_PTR_LIST(returned_state_cb_list, struct returned_state_callback);
92 static struct returned_state_cb_list *returned_state_callbacks;
93
94 struct returned_member_callback {
95 int owner;
96 void (*callback)(int return_id, char *return_ranges, struct expression *expr, char *printed_name, struct smatch_state *state);
97 };
98 ALLOCATOR(returned_member_callback, "returned member callbacks");
99 DECLARE_PTR_LIST(returned_member_cb_list, struct returned_member_callback);
100 static struct returned_member_cb_list *returned_member_callbacks;
101
102 struct call_implies_callback {
103 int type;
104 void (*callback)(struct expression *call, struct expression *arg, char *key, char *value);
105 };
106 ALLOCATOR(call_implies_callback, "call_implies callbacks");
107 DECLARE_PTR_LIST(call_implies_cb_list, struct call_implies_callback);
108 static struct call_implies_cb_list *call_implies_cb_list;
109
110 static int print_sql_output(void *unused, int argc, char **argv, char **azColName)
111 {
112 int i;
113
114 for (i = 0; i < argc; i++) {
115 if (i != 0)
116 printf(", ");
117 sm_printf("%s", argv[i]);
118 }
119 sm_printf("\n");
120 return 0;
121 }
122
123 void debug_sql(const char *sql)
124 {
125 if (!option_debug)
126 return;
127 sm_msg("%s", sql);
128 sql_exec(print_sql_output, NULL, sql);
129 }
130
131 void debug_mem_sql(const char *sql)
132 {
133 if (!option_debug)
134 return;
135 sm_msg("%s", sql);
136 sql_mem_exec(print_sql_output, NULL, sql);
137 }
138
139 void sql_exec(int (*callback)(void*, int, char**, char**), void *data, const char *sql)
140 {
141 char *err = NULL;
142 int rc;
143
144 if (option_no_db || !db)
145 return;
146
147 rc = sqlite3_exec(db, sql, callback, data, &err);
148 if (rc != SQLITE_OK && !parse_error) {
149 fprintf(stderr, "SQL error #2: %s\n", err);
150 fprintf(stderr, "SQL: '%s'\n", sql);
151 parse_error = 1;
152 }
153 }
154
155 void sql_mem_exec(int (*callback)(void*, int, char**, char**), void *data, const char *sql)
156 {
157 char *err = NULL;
158 int rc;
159
160 if (!mem_db)
161 return;
162
163 rc = sqlite3_exec(mem_db, sql, callback, data, &err);
164 if (rc != SQLITE_OK) {
165 fprintf(stderr, "SQL error #2: %s\n", err);
166 fprintf(stderr, "SQL: '%s'\n", sql);
167 parse_error = 1;
168 }
169 }
170
171 static int replace_count;
172 static char **replace_table;
173 static const char *replace_return_ranges(const char *return_ranges)
174 {
175 int i;
176
177 if (!get_function()) {
178 /* I have no idea why EXPORT_SYMBOL() is here */
179 return return_ranges;
180 }
181 for (i = 0; i < replace_count; i += 3) {
182 if (strcmp(replace_table[i + 0], get_function()) == 0) {
183 if (strcmp(replace_table[i + 1], return_ranges) == 0)
184 return replace_table[i + 2];
185 }
186 }
187 return return_ranges;
188 }
189
190 void sql_insert_return_states(int return_id, const char *return_ranges,
191 int type, int param, const char *key, const char *value)
192 {
193 if (key && strlen(key) >= 80)
194 return;
195 return_ranges = replace_return_ranges(return_ranges);
196 sql_insert(return_states, "'%s', '%s', %lu, %d, '%s', %d, %d, %d, '%s', '%s'",
197 get_base_file(), get_function(), (unsigned long)__inline_fn,
198 return_id, return_ranges, fn_static(), type, param, key, value);
199 }
200
201 static struct string_list *common_funcs;
202 static int is_common_function(const char *fn)
203 {
204 char *tmp;
205
206 if (!fn)
207 return 0;
208
209 if (strncmp(fn, "__builtin_", 10) == 0)
210 return 1;
211
212 FOR_EACH_PTR(common_funcs, tmp) {
213 if (strcmp(tmp, fn) == 0)
214 return 1;
215 } END_FOR_EACH_PTR(tmp);
216
217 return 0;
218 }
219
220 static char *function_signature(void)
221 {
222 return type_to_str(get_real_base_type(cur_func_sym));
223 }
224
225 void sql_insert_caller_info(struct expression *call, int type,
226 int param, const char *key, const char *value)
227 {
228 FILE *tmp_fd = sm_outfd;
229 char *fn;
230
231 if (!option_info && !__inline_call)
232 return;
233
234 if (key && strlen(key) >= 80)
235 return;
236
237 fn = get_fnptr_name(call->fn);
238 if (!fn)
239 return;
240
241 if (__inline_call) {
242 mem_sql(NULL, NULL,
243 "insert into caller_info values ('%s', '%s', '%s', %lu, %d, %d, %d, '%s', '%s');",
244 get_base_file(), get_function(), fn, (unsigned long)call,
245 is_static(call->fn), type, param, key, value);
246 }
247
248 if (!option_info)
249 return;
250
251 if (strncmp(fn, "__builtin_", 10) == 0)
252 return;
253 if (type != INTERNAL && is_common_function(fn))
254 return;
255
256 sm_outfd = caller_info_fd;
257 sm_msg("SQL_caller_info: insert into caller_info values ("
258 "'%s', '%s', '%s', %%CALL_ID%%, %d, %d, %d, '%s', '%s');",
259 get_base_file(), get_function(), fn, is_static(call->fn),
260 type, param, key, value);
261 sm_outfd = tmp_fd;
262
263 free_string(fn);
264 }
265
266 void sql_insert_function_ptr(const char *fn, const char *struct_name)
267 {
268 sql_insert(function_ptr, "'%s', '%s', '%s', 0", get_base_file(), fn,
269 struct_name);
270 }
271
272 void sql_insert_call_implies(int type, int param, const char *key, const char *value)
273 {
274 sql_insert(call_implies, "'%s', '%s', %lu, %d, %d, %d, '%s', '%s'", get_base_file(),
275 get_function(), (unsigned long)__inline_fn, fn_static(),
276 type, param, key, value);
277 }
278
279 void sql_insert_function_type_size(const char *member, const char *ranges)
280 {
281 sql_insert(function_type_size, "'%s', '%s', '%s', '%s'", get_base_file(), get_function(), member, ranges);
282 }
283
284 void sql_insert_local_values(const char *name, const char *value)
285 {
286 sql_insert(local_values, "'%s', '%s', '%s'", get_base_file(), name, value);
287 }
288
289 void sql_insert_function_type_value(const char *type, const char *value)
290 {
291 sql_insert(function_type_value, "'%s', '%s', '%s', '%s'", get_base_file(), get_function(), type, value);
292 }
293
294 void sql_insert_function_type(int param, const char *value)
295 {
296 sql_insert(function_type, "'%s', '%s', %d, %d, '%s'",
297 get_base_file(), get_function(), fn_static(), param, value);
298 }
299
300 void sql_insert_parameter_name(int param, const char *value)
301 {
302 sql_insert(parameter_name, "'%s', '%s', %d, %d, '%s'",
303 get_base_file(), get_function(), fn_static(), param, value);
304 }
305
306 void sql_insert_data_info(struct expression *data, int type, const char *value)
307 {
308 char *data_name;
309
310 data_name = get_data_info_name(data);
311 if (!data_name)
312 return;
313 sql_insert(data_info, "'%s', '%s', %d, '%s'",
314 is_static(data) ? get_base_file() : "extern",
315 data_name, type, value);
316 }
317
318 void sql_insert_data_info_var_sym(const char *var, struct symbol *sym, int type, const char *value)
319 {
320 sql_insert(data_info, "'%s', '%s', %d, '%s'",
321 (sym->ctype.modifiers & MOD_STATIC) ? get_base_file() : "extern",
322 var, type, value);
323 }
324
325 void sql_save_constraint(const char *con)
326 {
327 if (!option_info)
328 return;
329
330 sm_msg("SQL: insert or ignore into constraints (str) values('%s');", con);
331 }
332
333 void sql_save_constraint_required(const char *data, int op, const char *limit)
334 {
335 sql_insert_or_ignore(constraints_required, "'%s', '%s', '%s'", data, show_special(op), limit);
336 }
337
338 void sql_insert_fn_ptr_data_link(const char *ptr, const char *data)
339 {
340 sql_insert(fn_ptr_data_link, "'%s', '%s'", ptr, data);
341 }
342
343 void sql_insert_fn_data_link(struct expression *fn, int type, int param, const char *key, const char *value)
344 {
345 if (fn->type != EXPR_SYMBOL || !fn->symbol->ident)
346 return;
347
348 sql_insert(fn_data_link, "'%s', '%s', %d, %d, %d, '%s', '%s'",
349 (fn->symbol->ctype.modifiers & MOD_STATIC) ? get_base_file() : "extern",
350 fn->symbol->ident->name,
351 !!(fn->symbol->ctype.modifiers & MOD_STATIC),
352 type, param, key, value);
353 }
354
355 char *get_static_filter(struct symbol *sym)
356 {
357 static char sql_filter[1024];
358
359 /* This can only happen on buggy code. Return invalid SQL. */
360 if (!sym) {
361 sql_filter[0] = '\0';
362 return sql_filter;
363 }
364
365 if (sym->ctype.modifiers & MOD_STATIC) {
366 snprintf(sql_filter, sizeof(sql_filter),
367 "file = '%s' and function = '%s' and static = '1'",
368 get_base_file(), sym->ident->name);
369 } else {
370 snprintf(sql_filter, sizeof(sql_filter),
371 "function = '%s' and static = '0'", sym->ident->name);
372 }
373
374 return sql_filter;
375 }
376
377 static int get_row_count(void *_row_count, int argc, char **argv, char **azColName)
378 {
379 int *row_count = _row_count;
380
381 *row_count = 0;
382 if (argc != 1)
383 return 0;
384 *row_count = atoi(argv[0]);
385 return 0;
386 }
387
388 static void mark_params_untracked(struct expression *call)
389 {
390 struct expression *arg;
391 int i = 0;
392
393 FOR_EACH_PTR(call->args, arg) {
394 mark_untracked(call, i++, "$", NULL);
395 } END_FOR_EACH_PTR(arg);
396 }
397
398 static void sql_select_return_states_pointer(const char *cols,
399 struct expression *call, int (*callback)(void*, int, char**, char**), void *info)
400 {
401 char *ptr;
402 int return_count = 0;
403
404 ptr = get_fnptr_name(call->fn);
405 if (!ptr)
406 return;
407
408 run_sql(get_row_count, &return_count,
409 "select count(*) from return_states join function_ptr "
410 "where return_states.function == function_ptr.function and "
411 "ptr = '%s' and searchable = 1 and type = %d;", ptr, INTERNAL);
412 /* The magic number 100 is just from testing on the kernel. */
413 if (return_count > 100) {
414 mark_params_untracked(call);
415 return;
416 }
417
418 run_sql(callback, info,
419 "select %s from return_states join function_ptr where "
420 "return_states.function == function_ptr.function and ptr = '%s' "
421 "and searchable = 1 "
422 "order by function_ptr.file, return_states.file, return_id, type;",
423 cols, ptr);
424 }
425
426 static int is_local_symbol(struct expression *expr)
427 {
428 if (expr->type != EXPR_SYMBOL)
429 return 0;
430 if (expr->symbol->ctype.modifiers & (MOD_NONLOCAL | MOD_STATIC | MOD_ADDRESSABLE))
431 return 0;
432 return 1;
433 }
434
435 void sql_select_return_states(const char *cols, struct expression *call,
436 int (*callback)(void*, int, char**, char**), void *info)
437 {
438 int row_count = 0;
439
440 if (is_fake_call(call))
441 return;
442
443 if (call->fn->type != EXPR_SYMBOL || !call->fn->symbol || is_local_symbol(call->fn)) {
444 sql_select_return_states_pointer(cols, call, callback, info);
445 return;
446 }
447
448 if (inlinable(call->fn)) {
449 mem_sql(callback, info,
450 "select %s from return_states where call_id = '%lu' order by return_id, type;",
451 cols, (unsigned long)call);
452 return;
453 }
454
455 run_sql(get_row_count, &row_count, "select count(*) from return_states where %s;",
456 get_static_filter(call->fn->symbol));
457 if (row_count > 3000)
458 return;
459
460 run_sql(callback, info, "select %s from return_states where %s order by file, return_id, type;",
461 cols, get_static_filter(call->fn->symbol));
462 }
463
464 void sql_select_call_implies(const char *cols, struct expression *call,
465 int (*callback)(void*, int, char**, char**))
466 {
467 if (call->fn->type != EXPR_SYMBOL || !call->fn->symbol)
468 return;
469
470 if (inlinable(call->fn)) {
471 mem_sql(callback, call,
472 "select %s from call_implies where call_id = '%lu';",
473 cols, (unsigned long)call);
474 return;
475 }
476
477 run_sql(callback, call, "select %s from call_implies where %s;",
478 cols, get_static_filter(call->fn->symbol));
479 }
480
481 struct select_caller_info_data {
482 struct stree *final_states;
483 int prev_func_id;
484 int ignore;
485 int results;
486 };
487
488 static void sql_select_caller_info(struct select_caller_info_data *data,
489 const char *cols, struct symbol *sym,
490 int (*callback)(void*, int, char**, char**))
491 {
492 if (__inline_fn) {
493 mem_sql(callback, data,
494 "select %s from caller_info where call_id = %lu;",
495 cols, (unsigned long)__inline_fn);
496 return;
497 }
498
499 if (sym->ident->name && is_common_function(sym->ident->name))
500 return;
501 run_sql(callback, data,
502 "select %s from common_caller_info where %s order by call_id;",
503 cols, get_static_filter(sym));
504 if (data->results)
505 return;
506
507 run_sql(callback, data,
508 "select %s from caller_info where %s order by call_id;",
509 cols, get_static_filter(sym));
510 }
511
512 void select_caller_info_hook(void (*callback)(const char *name, struct symbol *sym, char *key, char *value), int type)
513 {
514 struct def_callback *def_callback = __alloc_def_callback(0);
515
516 def_callback->hook_type = type;
517 def_callback->callback = callback;
518 add_ptr_list(&select_caller_info_callbacks, def_callback);
519 }
520
521 /*
522 * These call backs are used when the --info option is turned on to print struct
523 * member information. For example foo->bar could have a state in
524 * smatch_extra.c and also check_user.c.
525 */
526 void add_member_info_callback(int owner, void (*callback)(struct expression *call, int param, char *printed_name, struct sm_state *sm))
527 {
528 struct member_info_callback *member_callback = __alloc_member_info_callback(0);
529
530 member_callback->owner = owner;
531 member_callback->callback = callback;
532 add_ptr_list(&member_callbacks, member_callback);
533 }
534
535 void add_split_return_callback(void (*fn)(int return_id, char *return_ranges, struct expression *returned_expr))
536 {
537 struct returned_state_callback *callback = __alloc_returned_state_callback(0);
538
539 callback->callback = fn;
540 add_ptr_list(&returned_state_callbacks, callback);
541 }
542
543 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))
544 {
545 struct returned_member_callback *member_callback = __alloc_returned_member_callback(0);
546
547 member_callback->owner = owner;
548 member_callback->callback = callback;
549 add_ptr_list(&returned_member_callbacks, member_callback);
550 }
551
552 void select_call_implies_hook(int type, void (*callback)(struct expression *call, struct expression *arg, char *key, char *value))
553 {
554 struct call_implies_callback *cb = __alloc_call_implies_callback(0);
555
556 cb->type = type;
557 cb->callback = callback;
558 add_ptr_list(&call_implies_cb_list, cb);
559 }
560
561 struct return_info {
562 struct expression *static_returns_call;
563 struct symbol *return_type;
564 struct range_list *return_range_list;
565 };
566
567 static int db_return_callback(void *_ret_info, int argc, char **argv, char **azColName)
568 {
569 struct return_info *ret_info = _ret_info;
570 struct range_list *rl;
571 struct expression *call_expr = ret_info->static_returns_call;
572
573 if (argc != 1)
574 return 0;
575 call_results_to_rl(call_expr, ret_info->return_type, argv[0], &rl);
576 ret_info->return_range_list = rl_union(ret_info->return_range_list, rl);
577 return 0;
578 }
579
580 struct range_list *db_return_vals(struct expression *expr)
581 {
582 struct return_info ret_info = {};
583 char buf[64];
584 struct sm_state *sm;
585
586 if (is_fake_call(expr))
587 return NULL;
588
589 snprintf(buf, sizeof(buf), "return %p", expr);
590 sm = get_sm_state(SMATCH_EXTRA, buf, NULL);
591 if (sm)
592 return clone_rl(estate_rl(sm->state));
593 ret_info.static_returns_call = expr;
594 ret_info.return_type = get_type(expr);
595 if (!ret_info.return_type)
596 return NULL;
597
598 if (expr->fn->type != EXPR_SYMBOL || !expr->fn->symbol)
599 return NULL;
600
601 ret_info.return_range_list = NULL;
602 if (inlinable(expr->fn)) {
603 mem_sql(db_return_callback, &ret_info,
604 "select distinct return from return_states where call_id = '%lu';",
605 (unsigned long)expr);
606 } else {
607 run_sql(db_return_callback, &ret_info,
608 "select distinct return from return_states where %s;",
609 get_static_filter(expr->fn->symbol));
610 }
611 return ret_info.return_range_list;
612 }
613
614 struct range_list *db_return_vals_from_str(const char *fn_name)
615 {
616 struct return_info ret_info;
617
618 ret_info.static_returns_call = NULL;
619 ret_info.return_type = &llong_ctype;
620 ret_info.return_range_list = NULL;
621
622 run_sql(db_return_callback, &ret_info,
623 "select distinct return from return_states where function = '%s';",
624 fn_name);
625 return ret_info.return_range_list;
626 }
627
628 static void match_call_marker(struct expression *expr)
629 {
630 struct symbol *type;
631
632 type = get_type(expr->fn);
633 if (type && type->type == SYM_PTR)
634 type = get_real_base_type(type);
635
636 /*
637 * we just want to record something in the database so that if we have
638 * two calls like: frob(4); frob(some_unkown); then on the receiving
639 * side we know that sometimes frob is called with unknown parameters.
640 */
641
642 sql_insert_caller_info(expr, INTERNAL, -1, "%call_marker%", type_to_str(type));
643 }
644
645 static char *show_offset(int offset)
646 {
647 static char buf[64];
648
649 buf[0] = '\0';
650 if (offset != -1)
651 snprintf(buf, sizeof(buf), "(-%d)", offset);
652 return buf;
653 }
654
655 static void print_struct_members(struct expression *call, struct expression *expr, int param, int offset, struct stree *stree,
656 void (*callback)(struct expression *call, int param, char *printed_name, struct sm_state *sm))
657 {
658 struct sm_state *sm;
659 char *name;
660 struct symbol *sym;
661 int len;
662 char printed_name[256];
663 int is_address = 0;
664
665 expr = strip_expr(expr);
666 if (expr->type == EXPR_PREOP && expr->op == '&') {
667 expr = strip_expr(expr->unop);
668 is_address = 1;
669 }
670
671 name = expr_to_var_sym(expr, &sym);
672 if (!name || !sym)
673 goto free;
674
675 len = strlen(name);
676 FOR_EACH_SM(stree, sm) {
677 if (sm->sym != sym)
678 continue;
679 if (strcmp(name, sm->name) == 0) {
680 if (is_address)
681 snprintf(printed_name, sizeof(printed_name), "*$%s", show_offset(offset));
682 else /* these are already handled. fixme: handle them here */
683 continue;
684 } else if (sm->name[0] == '*' && strcmp(name, sm->name + 1) == 0) {
685 snprintf(printed_name, sizeof(printed_name), "*$%s", show_offset(offset));
686 } else if (strncmp(name, sm->name, len) == 0) {
687 if (isalnum(sm->name[len]))
688 continue;
689 if (is_address)
690 snprintf(printed_name, sizeof(printed_name), "$%s->%s", show_offset(offset), sm->name + len + 1);
691 else
692 snprintf(printed_name, sizeof(printed_name), "$%s%s", show_offset(offset), sm->name + len);
693 } else {
694 continue;
695 }
696 callback(call, param, printed_name, sm);
697 } END_FOR_EACH_SM(sm);
698 free:
699 free_string(name);
700 }
701
702 static int param_used_callback(void *_container, int argc, char **argv, char **azColName)
703 {
704 char **container = _container;
705 static char buf[256];
706
707 snprintf(buf, sizeof(buf), "%s", argv[0]);
708 *container = buf;
709 return 0;
710 }
711
712 static void print_container_struct_members(struct expression *call, struct expression *expr, int param, struct stree *stree,
713 void (*callback)(struct expression *call, int param, char *printed_name, struct sm_state *sm))
714 {
715 struct expression *tmp;
716 char *container = NULL;
717 int offset;
718 int holder_offset;
719 char *p;
720
721 run_sql(&param_used_callback, &container,
722 "select key from call_implies where %s and key like '%%$(%%' and parameter = %d limit 1;",
723 get_static_filter(call->fn->symbol), param);
724 if (!container)
725 return;
726
727 p = strchr(container, '-');
728 if (!p)
729 return;
730 offset = atoi(p);
731 p = strchr(p, ')');
732 if (!p)
733 return;
734 p++;
735
736 tmp = get_assigned_expr(expr);
737 if (tmp)
738 expr = tmp;
739
740 if (expr->type != EXPR_PREOP || expr->op != '&')
741 return;
742 expr = strip_expr(expr->unop);
743 holder_offset = get_member_offset_from_deref(expr);
744 if (-holder_offset != offset)
745 return;
746
747 expr = strip_expr(expr->deref);
748 if (expr->type == EXPR_PREOP && expr->op == '*')
749 expr = strip_expr(expr->unop);
750
751 print_struct_members(call, expr, param, holder_offset, stree, callback);
752 }
753
754 static void match_call_info(struct expression *call)
755 {
756 struct member_info_callback *cb;
757 struct expression *arg;
758 struct stree *stree;
759 char *name;
760 int i;
761
762 name = get_fnptr_name(call->fn);
763 if (!name)
764 return;
765
766 FOR_EACH_PTR(member_callbacks, cb) {
767 stree = get_all_states_stree(cb->owner);
768 i = 0;
769 FOR_EACH_PTR(call->args, arg) {
770 print_struct_members(call, arg, i, -1, stree, cb->callback);
771 print_container_struct_members(call, arg, i, stree, cb->callback);
772 i++;
773 } END_FOR_EACH_PTR(arg);
774 free_stree(&stree);
775 } END_FOR_EACH_PTR(cb);
776
777 free_string(name);
778 }
779
780 static int get_param(int param, char **name, struct symbol **sym)
781 {
782 struct symbol *arg;
783 int i;
784
785 i = 0;
786 FOR_EACH_PTR(cur_func_sym->ctype.base_type->arguments, arg) {
787 /*
788 * this is a temporary hack to work around a bug (I think in sparse?)
789 * 2.6.37-rc1:fs/reiserfs/journal.o
790 * If there is a function definition without parameter name found
791 * after a function implementation then it causes a crash.
792 * int foo() {}
793 * int bar(char *);
794 */
795 if (arg->ident->name < (char *)100)
796 continue;
797 if (i == param) {
798 *name = arg->ident->name;
799 *sym = arg;
800 return TRUE;
801 }
802 i++;
803 } END_FOR_EACH_PTR(arg);
804
805 return FALSE;
806 }
807
808 static int function_signature_matches(const char *sig)
809 {
810 char *my_sig;
811
812 my_sig = function_signature();
813 if (!sig || !my_sig)
814 return 1; /* default to matching */
815 if (strcmp(my_sig, sig) == 0)
816 return 1;
817 return 0;
818 }
819
820 static int caller_info_callback(void *_data, int argc, char **argv, char **azColName)
821 {
822 struct select_caller_info_data *data = _data;
823 int func_id;
824 long type;
825 long param;
826 char *key;
827 char *value;
828 char *name = NULL;
829 struct symbol *sym = NULL;
830 struct def_callback *def_callback;
831 struct stree *stree;
832
833 data->results = 1;
834
835 if (argc != 5)
836 return 0;
837
838 func_id = atoi(argv[0]);
839 errno = 0;
840 type = strtol(argv[1], NULL, 10);
841 param = strtol(argv[2], NULL, 10);
842 if (errno)
843 return 0;
844 key = argv[3];
845 value = argv[4];
846
847 if (data->prev_func_id == -1)
848 data->prev_func_id = func_id;
849 if (func_id != data->prev_func_id) {
850 stree = __pop_fake_cur_stree();
851 if (!data->ignore)
852 merge_stree(&data->final_states, stree);
853 free_stree(&stree);
854 __push_fake_cur_stree();
855 __unnullify_path();
856 data->prev_func_id = func_id;
857 data->ignore = 0;
858 }
859
860 if (data->ignore)
861 return 0;
862 if (type == INTERNAL &&
863 !function_signature_matches(value)) {
864 data->ignore = 1;
865 return 0;
866 }
867
868 if (param >= 0 && !get_param(param, &name, &sym))
869 return 0;
870
871 FOR_EACH_PTR(select_caller_info_callbacks, def_callback) {
872 if (def_callback->hook_type == type)
873 def_callback->callback(name, sym, key, value);
874 } END_FOR_EACH_PTR(def_callback);
875
876 return 0;
877 }
878
879 static void get_direct_callers(struct select_caller_info_data *data, struct symbol *sym)
880 {
881 sql_select_caller_info(data,
882 "call_id, type, parameter, key, value", sym,
883 caller_info_callback);
884 }
885
886 static struct string_list *ptr_names_done;
887 static struct string_list *ptr_names;
888
889 static int get_ptr_name(void *unused, int argc, char **argv, char **azColName)
890 {
891 insert_string(&ptr_names, alloc_string(argv[0]));
892 return 0;
893 }
894
895 static char *get_next_ptr_name(void)
896 {
897 char *ptr;
898
899 FOR_EACH_PTR(ptr_names, ptr) {
900 if (list_has_string(ptr_names_done, ptr))
901 continue;
902 insert_string(&ptr_names_done, ptr);
903 return ptr;
904 } END_FOR_EACH_PTR(ptr);
905 return NULL;
906 }
907
908 static void get_ptr_names(const char *file, const char *name)
909 {
910 char sql_filter[1024];
911 int before, after;
912
913 if (file) {
914 snprintf(sql_filter, 1024, "file = '%s' and function = '%s';",
915 file, name);
916 } else {
917 snprintf(sql_filter, 1024, "function = '%s';", name);
918 }
919
920 before = ptr_list_size((struct ptr_list *)ptr_names);
921
922 run_sql(get_ptr_name, NULL,
923 "select distinct ptr from function_ptr where %s",
924 sql_filter);
925
926 after = ptr_list_size((struct ptr_list *)ptr_names);
927 if (before == after)
928 return;
929
930 while ((name = get_next_ptr_name()))
931 get_ptr_names(NULL, name);
932 }
933
934 static void match_data_from_db(struct symbol *sym)
935 {
936 struct select_caller_info_data data = { .prev_func_id = -1 };
937 struct sm_state *sm;
938 struct stree *stree;
939
940 if (!sym || !sym->ident)
941 return;
942
943 __push_fake_cur_stree();
944 __unnullify_path();
945
946 if (!__inline_fn) {
947 char *ptr;
948
949 if (sym->ctype.modifiers & MOD_STATIC)
950 get_ptr_names(get_base_file(), sym->ident->name);
951 else
952 get_ptr_names(NULL, sym->ident->name);
953
954 if (ptr_list_size((struct ptr_list *)ptr_names) > 20) {
955 __free_ptr_list((struct ptr_list **)&ptr_names);
956 __free_ptr_list((struct ptr_list **)&ptr_names_done);
957 stree = __pop_fake_cur_stree();
958 free_stree(&stree);
959 return;
960 }
961
962 get_direct_callers(&data, sym);
963
964 stree = __pop_fake_cur_stree();
965 if (!data.ignore)
966 merge_stree(&data.final_states, stree);
967 free_stree(&stree);
968 __push_fake_cur_stree();
969 __unnullify_path();
970 data.prev_func_id = -1;
971 data.ignore = 0;
972
973 FOR_EACH_PTR(ptr_names, ptr) {
974 run_sql(caller_info_callback, &data,
975 "select call_id, type, parameter, key, value"
976 " from common_caller_info where function = '%s' order by call_id",
977 ptr);
978 } END_FOR_EACH_PTR(ptr);
979
980 if (data.results) {
981 FOR_EACH_PTR(ptr_names, ptr) {
982 free_string(ptr);
983 } END_FOR_EACH_PTR(ptr);
984 goto free_ptr_names;
985 }
986
987 FOR_EACH_PTR(ptr_names, ptr) {
988 run_sql(caller_info_callback, &data,
989 "select call_id, type, parameter, key, value"
990 " from caller_info where function = '%s' order by call_id",
991 ptr);
992 free_string(ptr);
993 } END_FOR_EACH_PTR(ptr);
994
995 free_ptr_names:
996 __free_ptr_list((struct ptr_list **)&ptr_names);
997 __free_ptr_list((struct ptr_list **)&ptr_names_done);
998 } else {
999 get_direct_callers(&data, sym);
1000 }
1001
1002 stree = __pop_fake_cur_stree();
1003 if (!data.ignore)
1004 merge_stree(&data.final_states, stree);
1005 free_stree(&stree);
1006
1007 FOR_EACH_SM(data.final_states, sm) {
1008 __set_sm(sm);
1009 } END_FOR_EACH_SM(sm);
1010
1011 free_stree(&data.final_states);
1012 }
1013
1014 static int call_implies_callbacks(void *_call, int argc, char **argv, char **azColName)
1015 {
1016 struct expression *call_expr = _call;
1017 struct call_implies_callback *cb;
1018 struct expression *arg = NULL;
1019 int type;
1020 int param;
1021
1022 if (argc != 5)
1023 return 0;
1024
1025 type = atoi(argv[1]);
1026 param = atoi(argv[2]);
1027
1028 FOR_EACH_PTR(call_implies_cb_list, cb) {
1029 if (cb->type != type)
1030 continue;
1031 if (param != -1) {
1032 arg = get_argument_from_call_expr(call_expr->args, param);
1033 if (!arg)
1034 continue;
1035 }
1036 cb->callback(call_expr, arg, argv[3], argv[4]);
1037 } END_FOR_EACH_PTR(cb);
1038
1039 return 0;
1040 }
1041
1042 static void match_call_implies(struct expression *expr)
1043 {
1044 sql_select_call_implies("function, type, parameter, key, value", expr,
1045 call_implies_callbacks);
1046 }
1047
1048 static void print_initializer_list(struct expression_list *expr_list,
1049 struct symbol *struct_type)
1050 {
1051 struct expression *expr;
1052 struct symbol *base_type;
1053 char struct_name[256];
1054
1055 FOR_EACH_PTR(expr_list, expr) {
1056 if (expr->type == EXPR_INDEX && expr->idx_expression && expr->idx_expression->type == EXPR_INITIALIZER) {
1057 print_initializer_list(expr->idx_expression->expr_list, struct_type);
1058 continue;
1059 }
1060 if (expr->type != EXPR_IDENTIFIER)
1061 continue;
1062 if (!expr->expr_ident)
1063 continue;
1064 if (!expr->ident_expression || !expr->ident_expression->symbol_name)
1065 continue;
1066 base_type = get_type(expr->ident_expression);
1067 if (!base_type || base_type->type != SYM_FN)
1068 continue;
1069 snprintf(struct_name, sizeof(struct_name), "(struct %s)->%s",
1070 struct_type->ident->name, expr->expr_ident->name);
1071 sql_insert_function_ptr(expr->ident_expression->symbol_name->name,
1072 struct_name);
1073 } END_FOR_EACH_PTR(expr);
1074 }
1075
1076 static void global_variable(struct symbol *sym)
1077 {
1078 struct symbol *struct_type;
1079
1080 if (!sym->ident)
1081 return;
1082 if (!sym->initializer || sym->initializer->type != EXPR_INITIALIZER)
1083 return;
1084 struct_type = get_base_type(sym);
1085 if (!struct_type)
1086 return;
1087 if (struct_type->type == SYM_ARRAY) {
1088 struct_type = get_base_type(struct_type);
1089 if (!struct_type)
1090 return;
1091 }
1092 if (struct_type->type != SYM_STRUCT || !struct_type->ident)
1093 return;
1094 print_initializer_list(sym->initializer->expr_list, struct_type);
1095 }
1096
1097 static void match_return_info(int return_id, char *return_ranges, struct expression *expr)
1098 {
1099 sql_insert_return_states(return_id, return_ranges, INTERNAL, -1, "", function_signature());
1100 }
1101
1102 static void call_return_state_hooks_conditional(struct expression *expr)
1103 {
1104 struct returned_state_callback *cb;
1105 struct range_list *rl;
1106 char *return_ranges;
1107 int final_pass_orig = final_pass;
1108
1109 __push_fake_cur_stree();
1110
1111 final_pass = 0;
1112 __split_whole_condition(expr->conditional);
1113 final_pass = final_pass_orig;
1114
1115 if (get_implied_rl(expr->cond_true, &rl))
1116 rl = cast_rl(cur_func_return_type(), rl);
1117 else
1118 rl = cast_rl(cur_func_return_type(), alloc_whole_rl(get_type(expr->cond_true)));
1119 return_ranges = show_rl(rl);
1120 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(rl));
1121
1122 return_id++;
1123 FOR_EACH_PTR(returned_state_callbacks, cb) {
1124 cb->callback(return_id, return_ranges, expr->cond_true);
1125 } END_FOR_EACH_PTR(cb);
1126
1127 __push_true_states();
1128 __use_false_states();
1129
1130 if (get_implied_rl(expr->cond_false, &rl))
1131 rl = cast_rl(cur_func_return_type(), rl);
1132 else
1133 rl = cast_rl(cur_func_return_type(), alloc_whole_rl(get_type(expr->cond_false)));
1134 return_ranges = show_rl(rl);
1135 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(rl));
1136
1137 return_id++;
1138 FOR_EACH_PTR(returned_state_callbacks, cb) {
1139 cb->callback(return_id, return_ranges, expr->cond_false);
1140 } END_FOR_EACH_PTR(cb);
1141
1142 __merge_true_states();
1143 __free_fake_cur_stree();
1144 }
1145
1146 static void call_return_state_hooks_compare(struct expression *expr)
1147 {
1148 struct returned_state_callback *cb;
1149 char *return_ranges;
1150 int final_pass_orig = final_pass;
1151 sval_t sval = { .type = &int_ctype };
1152 sval_t ret;
1153
1154 if (!get_implied_value(expr, &ret))
1155 ret.value = -1;
1156
1157 __push_fake_cur_stree();
1158
1159 final_pass = 0;
1160 __split_whole_condition(expr);
1161 final_pass = final_pass_orig;
1162
1163 if (ret.value != 0) {
1164 return_ranges = alloc_sname("1");
1165 sval.value = 1;
1166 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_sval(sval));
1167
1168 return_id++;
1169 FOR_EACH_PTR(returned_state_callbacks, cb) {
1170 cb->callback(return_id, return_ranges, expr);
1171 } END_FOR_EACH_PTR(cb);
1172 }
1173
1174 __push_true_states();
1175 __use_false_states();
1176
1177 if (ret.value != 1) {
1178 return_ranges = alloc_sname("0");
1179 sval.value = 0;
1180 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_sval(sval));
1181
1182 return_id++;
1183 FOR_EACH_PTR(returned_state_callbacks, cb) {
1184 cb->callback(return_id, return_ranges, expr);
1185 } END_FOR_EACH_PTR(cb);
1186 }
1187
1188 __merge_true_states();
1189 __free_fake_cur_stree();
1190 }
1191
1192 static int ptr_in_list(struct sm_state *sm, struct state_list *slist)
1193 {
1194 struct sm_state *tmp;
1195
1196 FOR_EACH_PTR(slist, tmp) {
1197 if (strcmp(tmp->state->name, sm->state->name) == 0)
1198 return 1;
1199 } END_FOR_EACH_PTR(tmp);
1200
1201 return 0;
1202 }
1203
1204 static char *get_return_compare_str(struct expression *expr)
1205 {
1206 char *compare_str;
1207 char *var;
1208 char buf[256];
1209 int comparison;
1210 int param;
1211
1212 compare_str = expr_lte_to_param(expr, -1);
1213 if (compare_str)
1214 return compare_str;
1215 param = get_param_num(expr);
1216 if (param < 0)
1217 return NULL;
1218
1219 var = expr_to_var(expr);
1220 if (!var)
1221 return NULL;
1222 snprintf(buf, sizeof(buf), "%s orig", var);
1223 comparison = get_comparison_strings(var, buf);
1224 free_string(var);
1225
1226 if (!comparison)
1227 return NULL;
1228
1229 snprintf(buf, sizeof(buf), "[%s$%d]", show_special(comparison), param);
1230 return alloc_sname(buf);
1231 }
1232
1233 static int split_possible_helper(struct sm_state *sm, struct expression *expr)
1234 {
1235 struct returned_state_callback *cb;
1236 struct range_list *rl;
1237 char *return_ranges;
1238 struct sm_state *tmp;
1239 int ret = 0;
1240 int nr_possible, nr_states;
1241 char *compare_str = NULL;
1242 char buf[128];
1243 struct state_list *already_handled = NULL;
1244
1245 if (!sm || !sm->merged)
1246 return 0;
1247
1248 if (too_many_possible(sm))
1249 return 0;
1250
1251 /* bail if it gets too complicated */
1252 nr_possible = ptr_list_size((struct ptr_list *)sm->possible);
1253 nr_states = stree_count(__get_cur_stree());
1254 if (nr_states * nr_possible >= 2000)
1255 return 0;
1256
1257 FOR_EACH_PTR(sm->possible, tmp) {
1258 if (tmp->merged)
1259 continue;
1260 if (ptr_in_list(tmp, already_handled))
1261 continue;
1262 add_ptr_list(&already_handled, tmp);
1263
1264 ret = 1;
1265 __push_fake_cur_stree();
1266
1267 overwrite_states_using_pool(sm, tmp);
1268
1269 rl = cast_rl(cur_func_return_type(), estate_rl(tmp->state));
1270 return_ranges = show_rl(rl);
1271 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(clone_rl(rl)));
1272 compare_str = get_return_compare_str(expr);
1273 if (compare_str) {
1274 snprintf(buf, sizeof(buf), "%s%s", return_ranges, compare_str);
1275 return_ranges = alloc_sname(buf);
1276 }
1277
1278 return_id++;
1279 FOR_EACH_PTR(returned_state_callbacks, cb) {
1280 cb->callback(return_id, return_ranges, expr);
1281 } END_FOR_EACH_PTR(cb);
1282
1283 __free_fake_cur_stree();
1284 } END_FOR_EACH_PTR(tmp);
1285
1286 free_slist(&already_handled);
1287
1288 return ret;
1289 }
1290
1291 static int call_return_state_hooks_split_possible(struct expression *expr)
1292 {
1293 struct sm_state *sm;
1294
1295 if (!expr || expr_equal_to_param(expr, -1))
1296 return 0;
1297
1298 sm = get_sm_state_expr(SMATCH_EXTRA, expr);
1299 return split_possible_helper(sm, expr);
1300 }
1301
1302 static const char *get_return_ranges_str(struct expression *expr, struct range_list **rl_p)
1303 {
1304 struct range_list *rl;
1305 char *return_ranges;
1306 sval_t sval;
1307 char *compare_str;
1308 char *math_str;
1309 char buf[128];
1310
1311 *rl_p = NULL;
1312
1313 if (!expr)
1314 return alloc_sname("");
1315
1316 if (get_implied_value(expr, &sval)) {
1317 sval = sval_cast(cur_func_return_type(), sval);
1318 *rl_p = alloc_rl(sval, sval);
1319 return sval_to_str(sval);
1320 }
1321
1322 compare_str = expr_equal_to_param(expr, -1);
1323 math_str = get_value_in_terms_of_parameter_math(expr);
1324
1325 if (get_implied_rl(expr, &rl)) {
1326 rl = cast_rl(cur_func_return_type(), rl);
1327 return_ranges = show_rl(rl);
1328 } else if (get_imaginary_absolute(expr, &rl)){
1329 rl = cast_rl(cur_func_return_type(), rl);
1330 return alloc_sname(show_rl(rl));
1331 } else {
1332 rl = cast_rl(cur_func_return_type(), alloc_whole_rl(get_type(expr)));
1333 return_ranges = show_rl(rl);
1334 }
1335 *rl_p = rl;
1336
1337 if (compare_str) {
1338 snprintf(buf, sizeof(buf), "%s%s", return_ranges, compare_str);
1339 return alloc_sname(buf);
1340 }
1341
1342 if (math_str) {
1343 snprintf(buf, sizeof(buf), "%s[%s]", return_ranges, math_str);
1344 return alloc_sname(buf);
1345 }
1346
1347 compare_str = get_return_compare_str(expr);
1348 if (compare_str) {
1349 snprintf(buf, sizeof(buf), "%s%s", return_ranges, compare_str);
1350 return alloc_sname(buf);
1351 }
1352 return return_ranges;
1353 }
1354
1355 static int split_positive_from_negative(struct expression *expr)
1356 {
1357 struct returned_state_callback *cb;
1358 struct range_list *rl;
1359 const char *return_ranges;
1360 struct range_list *ret_rl;
1361 int undo;
1362
1363 /* We're going to print the states 3 times */
1364 if (stree_count(__get_cur_stree()) > 10000 / 3)
1365 return 0;
1366
1367 if (!get_implied_rl(expr, &rl) || !rl)
1368 return 0;
1369 if (is_whole_rl(rl) || is_whole_rl_non_zero(rl))
1370 return 0;
1371 /* Forget about INT_MAX and larger */
1372 if (rl_max(rl).value <= 0)
1373 return 0;
1374 if (!sval_is_negative(rl_min(rl)))
1375 return 0;
1376
1377 if (!assume(compare_expression(expr, '>', zero_expr())))
1378 return 0;
1379
1380 return_id++;
1381 return_ranges = get_return_ranges_str(expr, &ret_rl);
1382 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));
1383 FOR_EACH_PTR(returned_state_callbacks, cb) {
1384 cb->callback(return_id, (char *)return_ranges, expr);
1385 } END_FOR_EACH_PTR(cb);
1386
1387 end_assume();
1388
1389 if (rl_has_sval(rl, sval_type_val(rl_type(rl), 0))) {
1390 undo = assume(compare_expression(expr, SPECIAL_EQUAL, zero_expr()));
1391
1392 return_id++;
1393 return_ranges = get_return_ranges_str(expr, &ret_rl);
1394 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));
1395 FOR_EACH_PTR(returned_state_callbacks, cb) {
1396 cb->callback(return_id, (char *)return_ranges, expr);
1397 } END_FOR_EACH_PTR(cb);
1398
1399 if (undo)
1400 end_assume();
1401 }
1402
1403 undo = assume(compare_expression(expr, '<', zero_expr()));
1404
1405 return_id++;
1406 return_ranges = get_return_ranges_str(expr, &ret_rl);
1407 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));
1408 FOR_EACH_PTR(returned_state_callbacks, cb) {
1409 cb->callback(return_id, (char *)return_ranges, expr);
1410 } END_FOR_EACH_PTR(cb);
1411
1412 if (undo)
1413 end_assume();
1414
1415 return 1;
1416 }
1417
1418 static int call_return_state_hooks_split_null_non_null(struct expression *expr)
1419 {
1420 struct returned_state_callback *cb;
1421 struct range_list *rl;
1422 struct range_list *nonnull_rl;
1423 sval_t null_sval;
1424 struct range_list *null_rl = NULL;
1425 char *return_ranges;
1426 struct sm_state *sm;
1427 struct smatch_state *state;
1428 int nr_states;
1429 int final_pass_orig = final_pass;
1430
1431 if (!expr || expr_equal_to_param(expr, -1))
1432 return 0;
1433 if (expr->type == EXPR_CALL)
1434 return 0;
1435 if (!is_pointer(expr))
1436 return 0;
1437
1438 sm = get_sm_state_expr(SMATCH_EXTRA, expr);
1439 if (!sm)
1440 return 0;
1441 if (ptr_list_size((struct ptr_list *)sm->possible) == 1)
1442 return 0;
1443 state = sm->state;
1444 if (!estate_rl(state))
1445 return 0;
1446 if (estate_min(state).value == 0 && estate_max(state).value == 0)
1447 return 0;
1448 if (!rl_has_sval(estate_rl(state), sval_type_val(estate_type(state), 0)))
1449 return 0;
1450
1451 nr_states = stree_count(__get_cur_stree());
1452 if (option_info && nr_states >= 1500)
1453 return 0;
1454
1455 rl = estate_rl(state);
1456
1457 __push_fake_cur_stree();
1458
1459 final_pass = 0;
1460 __split_whole_condition(expr);
1461 final_pass = final_pass_orig;
1462
1463 nonnull_rl = rl_filter(rl, rl_zero());
1464 return_ranges = show_rl(nonnull_rl);
1465 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(nonnull_rl));
1466
1467 return_id++;
1468 FOR_EACH_PTR(returned_state_callbacks, cb) {
1469 cb->callback(return_id, return_ranges, expr);
1470 } END_FOR_EACH_PTR(cb);
1471
1472 __push_true_states();
1473 __use_false_states();
1474
1475 return_ranges = alloc_sname("0");
1476 null_sval = sval_type_val(rl_type(rl), 0);
1477 add_range(&null_rl, null_sval, null_sval);
1478 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(null_rl));
1479 return_id++;
1480 FOR_EACH_PTR(returned_state_callbacks, cb) {
1481 cb->callback(return_id, return_ranges, expr);
1482 } END_FOR_EACH_PTR(cb);
1483
1484 __merge_true_states();
1485 __free_fake_cur_stree();
1486
1487 return 1;
1488 }
1489
1490 static int call_return_state_hooks_split_success_fail(struct expression *expr)
1491 {
1492 struct range_list *rl;
1493 struct range_list *nonzero_rl;
1494 sval_t zero_sval;
1495 struct range_list *zero_rl = NULL;
1496 int nr_states;
1497 struct returned_state_callback *cb;
1498 char *return_ranges;
1499 int final_pass_orig = final_pass;
1500 sval_t val;
1501
1502 if (option_project != PROJ_KERNEL)
1503 return 0;
1504
1505 nr_states = stree_count(__get_cur_stree());
1506 if (nr_states > 1500)
1507 return 0;
1508
1509 if (get_value(expr, &val))
1510 return 0;
1511 if (!get_implied_rl(expr, &rl))
1512 return 0;
1513 if (rl_min(rl).value < -4095 || rl_min(rl).value >= 0)
1514 return 0;
1515 if (rl_max(rl).value != 0)
1516 return 0;
1517
1518 __push_fake_cur_stree();
1519
1520 final_pass = 0;
1521 __split_whole_condition(expr);
1522 final_pass = final_pass_orig;
1523
1524 nonzero_rl = rl_filter(rl, rl_zero());
1525 return_ranges = show_rl(nonzero_rl);
1526 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(nonzero_rl));
1527
1528 return_id++;
1529 FOR_EACH_PTR(returned_state_callbacks, cb) {
1530 cb->callback(return_id, return_ranges, expr);
1531 } END_FOR_EACH_PTR(cb);
1532
1533 __push_true_states();
1534 __use_false_states();
1535
1536 return_ranges = alloc_sname("0");
1537 zero_sval = sval_type_val(rl_type(rl), 0);
1538 add_range(&zero_rl, zero_sval, zero_sval);
1539 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(zero_rl));
1540 return_id++;
1541 FOR_EACH_PTR(returned_state_callbacks, cb) {
1542 cb->callback(return_id, return_ranges, expr);
1543 } END_FOR_EACH_PTR(cb);
1544
1545 __merge_true_states();
1546 __free_fake_cur_stree();
1547
1548 return 1;
1549 }
1550
1551 static int is_boolean(struct expression *expr)
1552 {
1553 struct range_list *rl;
1554
1555 if (!get_implied_rl(expr, &rl))
1556 return 0;
1557 if (rl_min(rl).value == 0 && rl_max(rl).value == 1)
1558 return 1;
1559 return 0;
1560 }
1561
1562 static int is_conditional(struct expression *expr)
1563 {
1564 if (!expr)
1565 return 0;
1566 if (expr->type == EXPR_CONDITIONAL || expr->type == EXPR_SELECT)
1567 return 1;
1568 return 0;
1569 }
1570
1571 static int splitable_function_call(struct expression *expr)
1572 {
1573 struct sm_state *sm;
1574 char buf[64];
1575
1576 if (!expr || expr->type != EXPR_CALL)
1577 return 0;
1578 snprintf(buf, sizeof(buf), "return %p", expr);
1579 sm = get_sm_state(SMATCH_EXTRA, buf, NULL);
1580 return split_possible_helper(sm, expr);
1581 }
1582
1583 static struct sm_state *find_bool_param(void)
1584 {
1585 struct stree *start_states;
1586 struct symbol *arg;
1587 struct sm_state *sm, *tmp;
1588 sval_t sval;
1589
1590 start_states = get_start_states();
1591
1592 FOR_EACH_PTR_REVERSE(cur_func_sym->ctype.base_type->arguments, arg) {
1593 if (!arg->ident)
1594 continue;
1595 sm = get_sm_state_stree(start_states, SMATCH_EXTRA, arg->ident->name, arg);
1596 if (!sm)
1597 continue;
1598 if (rl_min(estate_rl(sm->state)).value != 0 ||
1599 rl_max(estate_rl(sm->state)).value != 1)
1600 continue;
1601 goto found;
1602 } END_FOR_EACH_PTR_REVERSE(arg);
1603
1604 return NULL;
1605
1606 found:
1607 /*
1608 * Check if it's splitable. If not, then splitting it up is likely not
1609 * useful for the callers.
1610 */
1611 FOR_EACH_PTR(sm->possible, tmp) {
1612 if (is_merged(tmp))
1613 continue;
1614 if (!estate_get_single_value(tmp->state, &sval))
1615 return NULL;
1616 } END_FOR_EACH_PTR(tmp);
1617
1618 return sm;
1619 }
1620
1621 static int split_on_bool_sm(struct sm_state *sm, struct expression *expr)
1622 {
1623 struct returned_state_callback *cb;
1624 struct range_list *ret_rl;
1625 const char *return_ranges;
1626 struct sm_state *tmp;
1627 int ret = 0;
1628 int nr_possible, nr_states;
1629 char *compare_str = NULL;
1630 char buf[128];
1631 struct state_list *already_handled = NULL;
1632
1633 if (!sm || !sm->merged)
1634 return 0;
1635
1636 if (too_many_possible(sm))
1637 return 0;
1638
1639 /* bail if it gets too complicated */
1640 nr_possible = ptr_list_size((struct ptr_list *)sm->possible);
1641 nr_states = stree_count(__get_cur_stree());
1642 if (nr_states * nr_possible >= 2000)
1643 return 0;
1644
1645 FOR_EACH_PTR(sm->possible, tmp) {
1646 if (tmp->merged)
1647 continue;
1648 if (ptr_in_list(tmp, already_handled))
1649 continue;
1650 add_ptr_list(&already_handled, tmp);
1651
1652 ret = 1;
1653 __push_fake_cur_stree();
1654
1655 overwrite_states_using_pool(sm, tmp);
1656
1657 return_ranges = get_return_ranges_str(expr, &ret_rl);
1658 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));
1659 compare_str = get_return_compare_str(expr);
1660 if (compare_str) {
1661 snprintf(buf, sizeof(buf), "%s%s", return_ranges, compare_str);
1662 return_ranges = alloc_sname(buf);
1663 }
1664
1665 return_id++;
1666 FOR_EACH_PTR(returned_state_callbacks, cb) {
1667 cb->callback(return_id, (char *)return_ranges, expr);
1668 } END_FOR_EACH_PTR(cb);
1669
1670 __free_fake_cur_stree();
1671 } END_FOR_EACH_PTR(tmp);
1672
1673 free_slist(&already_handled);
1674
1675 return ret;
1676 }
1677
1678 static int split_by_bool_param(struct expression *expr)
1679 {
1680 struct sm_state *start_sm, *sm;
1681 sval_t sval;
1682
1683 start_sm = find_bool_param();
1684 if (!start_sm)
1685 return 0;
1686 sm = get_sm_state(SMATCH_EXTRA, start_sm->name, start_sm->sym);
1687 if (!sm || estate_get_single_value(sm->state, &sval))
1688 return 0;
1689 return split_on_bool_sm(sm, expr);
1690 }
1691
1692 static int split_by_null_nonnull_param(struct expression *expr)
1693 {
1694 struct symbol *arg;
1695 struct sm_state *sm;
1696
1697 /* function must only take one pointer */
1698 if (ptr_list_size((struct ptr_list *)cur_func_sym->ctype.base_type->arguments) != 1)
1699 return 0;
1700 arg = first_ptr_list((struct ptr_list *)cur_func_sym->ctype.base_type->arguments);
1701 if (!arg->ident)
1702 return 0;
1703 if (get_real_base_type(arg)->type != SYM_PTR)
1704 return 0;
1705
1706 if (param_was_set_var_sym(arg->ident->name, arg))
1707 return 0;
1708 sm = get_sm_state(SMATCH_EXTRA, arg->ident->name, arg);
1709 if (!sm)
1710 return 0;
1711
1712 return split_on_bool_sm(sm, expr);
1713 }
1714
1715 struct expression *strip_expr_statement(struct expression *expr)
1716 {
1717 struct expression *orig = expr;
1718 struct statement *stmt, *last_stmt;
1719
1720 if (!expr)
1721 return NULL;
1722 if (expr->type == EXPR_PREOP && expr->op == '(')
1723 expr = expr->unop;
1724 if (expr->type != EXPR_STATEMENT)
1725 return orig;
1726 stmt = expr->statement;
1727 if (!stmt || stmt->type != STMT_COMPOUND)
1728 return orig;
1729
1730 last_stmt = last_ptr_list((struct ptr_list *)stmt->stmts);
1731 if (!last_stmt || last_stmt->type == STMT_LABEL)
1732 last_stmt = last_stmt->label_statement;
1733 if (!last_stmt || last_stmt->type != STMT_EXPRESSION)
1734 return orig;
1735 return strip_expr(last_stmt->expression);
1736 }
1737
1738 static void call_return_state_hooks(struct expression *expr)
1739 {
1740 struct returned_state_callback *cb;
1741 struct range_list *ret_rl;
1742 const char *return_ranges;
1743 int nr_states;
1744 sval_t sval;
1745
1746 if (__path_is_null())
1747 return;
1748
1749 expr = strip_expr(expr);
1750 expr = strip_expr_statement(expr);
1751
1752 if (is_impossible_path())
1753 goto vanilla;
1754
1755 if (expr && (expr->type == EXPR_COMPARE ||
1756 !get_implied_value(expr, &sval)) &&
1757 (is_condition(expr) || is_boolean(expr))) {
1758 call_return_state_hooks_compare(expr);
1759 return;
1760 } else if (is_conditional(expr)) {
1761 call_return_state_hooks_conditional(expr);
1762 return;
1763 } else if (call_return_state_hooks_split_possible(expr)) {
1764 return;
1765 } else if (call_return_state_hooks_split_null_non_null(expr)) {
1766 return;
1767 } else if (call_return_state_hooks_split_success_fail(expr)) {
1768 return;
1769 } else if (splitable_function_call(expr)) {
1770 return;
1771 } else if (split_positive_from_negative(expr)) {
1772 return;
1773 } else if (split_by_bool_param(expr)) {
1774 } else if (split_by_null_nonnull_param(expr)) {
1775 return;
1776 }
1777
1778 vanilla:
1779 return_ranges = get_return_ranges_str(expr, &ret_rl);
1780 set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));
1781
1782 return_id++;
1783 nr_states = stree_count(__get_cur_stree());
1784 if (nr_states >= 10000) {
1785 match_return_info(return_id, (char *)return_ranges, expr);
1786 return;
1787 }
1788 FOR_EACH_PTR(returned_state_callbacks, cb) {
1789 cb->callback(return_id, (char *)return_ranges, expr);
1790 } END_FOR_EACH_PTR(cb);
1791 }
1792
1793 static void print_returned_struct_members(int return_id, char *return_ranges, struct expression *expr)
1794 {
1795 struct returned_member_callback *cb;
1796 struct stree *stree;
1797 struct sm_state *sm;
1798 struct symbol *type;
1799 char *name;
1800 char member_name[256];
1801 int len;
1802
1803 type = get_type(expr);
1804 if (!type || type->type != SYM_PTR)
1805 return;
1806 name = expr_to_var(expr);
1807 if (!name)
1808 return;
1809
1810 member_name[sizeof(member_name) - 1] = '\0';
1811 strcpy(member_name, "$");
1812
1813 len = strlen(name);
1814 FOR_EACH_PTR(returned_member_callbacks, cb) {
1815 stree = __get_cur_stree();
1816 FOR_EACH_MY_SM(cb->owner, stree, sm) {
1817 if (sm->name[0] == '*' && strcmp(sm->name + 1, name) == 0) {
1818 strcpy(member_name, "*$");
1819 cb->callback(return_id, return_ranges, expr, member_name, sm->state);
1820 continue;
1821 }
1822 if (strncmp(sm->name, name, len) != 0)
1823 continue;
1824 if (strncmp(sm->name + len, "->", 2) != 0)
1825 continue;
1826 snprintf(member_name, sizeof(member_name), "$%s", sm->name + len);
1827 cb->callback(return_id, return_ranges, expr, member_name, sm->state);
1828 } END_FOR_EACH_SM(sm);
1829 } END_FOR_EACH_PTR(cb);
1830
1831 free_string(name);
1832 }
1833
1834 static void reset_memdb(struct symbol *sym)
1835 {
1836 mem_sql(NULL, NULL, "delete from caller_info;");
1837 mem_sql(NULL, NULL, "delete from return_states;");
1838 mem_sql(NULL, NULL, "delete from call_implies;");
1839 }
1840
1841 static void match_end_func_info(struct symbol *sym)
1842 {
1843 if (__path_is_null())
1844 return;
1845 call_return_state_hooks(NULL);
1846 }
1847
1848 static void match_after_func(struct symbol *sym)
1849 {
1850 if (!__inline_fn)
1851 reset_memdb(sym);
1852 }
1853
1854 static void init_memdb(void)
1855 {
1856 char *err = NULL;
1857 int rc;
1858 const char *schema_files[] = {
1859 "db/db.schema",
1860 "db/caller_info.schema",
1861 "db/return_states.schema",
1862 "db/function_type_size.schema",
1863 "db/type_size.schema",
1864 "db/call_implies.schema",
1865 "db/function_ptr.schema",
1866 "db/local_values.schema",
1867 "db/function_type_value.schema",
1868 "db/type_value.schema",
1869 "db/function_type.schema",
1870 "db/data_info.schema",
1871 "db/parameter_name.schema",
1872 "db/constraints.schema",
1873 "db/constraints_required.schema",
1874 "db/fn_ptr_data_link.schema",
1875 "db/fn_data_link.schema",
1876 };
1877 static char buf[4096];
1878 int fd;
1879 int ret;
1880 int i;
1881
1882 rc = sqlite3_open(":memory:", &mem_db);
1883 if (rc != SQLITE_OK) {
1884 printf("Error starting In-Memory database.");
1885 return;
1886 }
1887
1888 for (i = 0; i < ARRAY_SIZE(schema_files); i++) {
1889 fd = open_data_file(schema_files[i]);
1890 if (fd < 0) {
1891 mem_db = NULL;
1892 return;
1893 }
1894 ret = read(fd, buf, sizeof(buf));
1895 if (ret == sizeof(buf)) {
1896 printf("Schema file too large: %s (limit %zd bytes)",
1897 schema_files[i], sizeof(buf));
1898 }
1899 buf[ret] = '\0';
1900 rc = sqlite3_exec(mem_db, buf, NULL, NULL, &err);
1901 if (rc != SQLITE_OK) {
1902 fprintf(stderr, "SQL error #2: %s\n", err);
1903 fprintf(stderr, "%s\n", buf);
1904 }
1905 }
1906 }
1907
1908 void open_smatch_db(void)
1909 {
1910 int rc;
1911
1912 if (option_no_db)
1913 return;
1914
1915 init_memdb();
1916
1917 rc = sqlite3_open_v2("smatch_db.sqlite", &db, SQLITE_OPEN_READONLY, NULL);
1918 if (rc != SQLITE_OK) {
1919 option_no_db = 1;
1920 return;
1921 }
1922 return;
1923 }
1924
1925 static void register_common_funcs(void)
1926 {
1927 struct token *token;
1928 char *func;
1929 char filename[256];
1930
1931 if (option_project == PROJ_NONE)
1932 strcpy(filename, "common_functions");
1933 else
1934 snprintf(filename, 256, "%s.common_functions", option_project_str);
1935
1936 token = get_tokens_file(filename);
1937 if (!token)
1938 return;
1939 if (token_type(token) != TOKEN_STREAMBEGIN)
1940 return;
1941 token = token->next;
1942 while (token_type(token) != TOKEN_STREAMEND) {
1943 if (token_type(token) != TOKEN_IDENT)
1944 return;
1945 func = alloc_string(show_ident(token->ident));
1946 add_ptr_list(&common_funcs, func);
1947 token = token->next;
1948 }
1949 clear_token_alloc();
1950 }
1951
1952 static char *get_next_string(char **str)
1953 {
1954 static char string[256];
1955 char *start;
1956 char *p = *str;
1957 int len;
1958
1959 if (*p == '\0')
1960 return NULL;
1961 start = p;
1962
1963 while (*p != '\0' && *p != ' ' && *p != '\n')
1964 p++;
1965
1966 len = p - start;
1967 if (len > 256) {
1968 memcpy(string, start, 255);
1969 string[255] = '\0';
1970 printf("return_fix: '%s' too long", string);
1971 **str = '\0';
1972 return NULL;
1973 }
1974 memcpy(string, start, len);
1975 string[len] = '\0';
1976 if (*p != '\0')
1977 p++;
1978 *str = p;
1979 return string;
1980 }
1981
1982 static void register_return_replacements(void)
1983 {
1984 char *func, *orig, *new;
1985 char filename[256];
1986 char buf[4096];
1987 int fd, ret, i;
1988 char *p;
1989
1990 snprintf(filename, 256, "db/%s.return_fixes", option_project_str);
1991 fd = open_data_file(filename);
1992 if (fd < 0)
1993 return;
1994 ret = read(fd, buf, sizeof(buf));
1995 close(fd);
1996 if (ret < 0)
1997 return;
1998 if (ret == sizeof(buf)) {
1999 printf("file too large: %s (limit %zd bytes)",
2000 filename, sizeof(buf));
2001 return;
2002 }
2003 buf[ret] = '\0';
2004
2005 p = buf;
2006 while (*p) {
2007 get_next_string(&p);
2008 replace_count++;
2009 }
2010 if (replace_count == 0 || replace_count % 3 != 0) {
2011 replace_count = 0;
2012 return;
2013 }
2014 replace_table = malloc(replace_count * sizeof(char *));
2015
2016 p = buf;
2017 i = 0;
2018 while (*p) {
2019 func = alloc_string(get_next_string(&p));
2020 orig = alloc_string(get_next_string(&p));
2021 new = alloc_string(get_next_string(&p));
2022
2023 replace_table[i++] = func;
2024 replace_table[i++] = orig;
2025 replace_table[i++] = new;
2026 }
2027 }
2028
2029 void register_definition_db_callbacks(int id)
2030 {
2031 add_hook(&match_call_info, FUNCTION_CALL_HOOK);
2032 add_hook(&global_variable, BASE_HOOK);
2033 add_hook(&global_variable, DECLARATION_HOOK);
2034 add_split_return_callback(match_return_info);
2035 add_split_return_callback(print_returned_struct_members);
2036 add_hook(&call_return_state_hooks, RETURN_HOOK);
2037 add_hook(&match_end_func_info, END_FUNC_HOOK);
2038 add_hook(&match_after_func, AFTER_FUNC_HOOK);
2039
2040 add_hook(&match_data_from_db, FUNC_DEF_HOOK);
2041 add_hook(&match_call_implies, CALL_HOOK_AFTER_INLINE);
2042
2043 register_common_funcs();
2044 register_return_replacements();
2045 }
2046
2047 void register_db_call_marker(int id)
2048 {
2049 add_hook(&match_call_marker, FUNCTION_CALL_HOOK);
2050 }
2051
2052 char *return_state_to_var_sym(struct expression *expr, int param, const char *key, struct symbol **sym)
2053 {
2054 struct expression *arg;
2055 char *name = NULL;
2056 char member_name[256];
2057
2058 *sym = NULL;
2059
2060 if (param == -1) {
2061 const char *star = "";
2062
2063 if (expr->type != EXPR_ASSIGNMENT)
2064 return NULL;
2065 name = expr_to_var_sym(expr->left, sym);
2066 if (!name)
2067 return NULL;
2068 if (key[0] == '*') {
2069 star = "*";
2070 key++;
2071 }
2072 if (strncmp(key, "$", 1) != 0)
2073 return name;
2074 snprintf(member_name, sizeof(member_name), "%s%s%s", star, name, key + 1);
2075 free_string(name);
2076 return alloc_string(member_name);
2077 }
2078
2079 while (expr->type == EXPR_ASSIGNMENT)
2080 expr = strip_expr(expr->right);
2081 if (expr->type != EXPR_CALL)
2082 return NULL;
2083
2084 arg = get_argument_from_call_expr(expr->args, param);
2085 if (!arg)
2086 return NULL;
2087
2088 return get_variable_from_key(arg, key, sym);
2089 }
2090
2091 char *get_variable_from_key(struct expression *arg, const char *key, struct symbol **sym)
2092 {
2093 char buf[256];
2094 char *tmp;
2095
2096 if (!arg)
2097 return NULL;
2098
2099 arg = strip_expr(arg);
2100
2101 if (strcmp(key, "$") == 0)
2102 return expr_to_var_sym(arg, sym);
2103
2104 if (strcmp(key, "*$") == 0) {
2105 if (arg->type == EXPR_PREOP && arg->op == '&') {
2106 arg = strip_expr(arg->unop);
2107 return expr_to_var_sym(arg, sym);
2108 } else {
2109 tmp = expr_to_var_sym(arg, sym);
2110 if (!tmp)
2111 return NULL;
2112 snprintf(buf, sizeof(buf), "*%s", tmp);
2113 free_string(tmp);
2114 return alloc_string(buf);
2115 }
2116 }
2117
2118 if (arg->type == EXPR_PREOP && arg->op == '&') {
2119 arg = strip_expr(arg->unop);
2120 tmp = expr_to_var_sym(arg, sym);
2121 if (!tmp)
2122 return NULL;
2123 snprintf(buf, sizeof(buf), "%s.%s", tmp, key + 3);
2124 return alloc_string(buf);
2125 }
2126
2127 tmp = expr_to_var_sym(arg, sym);
2128 if (!tmp)
2129 return NULL;
2130 snprintf(buf, sizeof(buf), "%s%s", tmp, key + 1);
2131 free_string(tmp);
2132 return alloc_string(buf);
2133 }
2134
2135 char *get_chunk_from_key(struct expression *arg, char *key, struct symbol **sym, struct var_sym_list **vsl)
2136 {
2137 *vsl = NULL;
2138
2139 if (strcmp("$", key) == 0)
2140 return expr_to_chunk_sym_vsl(arg, sym, vsl);
2141 return get_variable_from_key(arg, key, sym);
2142 }
2143
2144 const char *state_name_to_param_name(const char *state_name, const char *param_name)
2145 {
2146 int name_len;
2147 static char buf[256];
2148
2149 name_len = strlen(param_name);
2150
2151 if (strcmp(state_name, param_name) == 0) {
2152 return "$";
2153 } else if (state_name[name_len] == '-' && /* check for '-' from "->" */
2154 strncmp(state_name, param_name, name_len) == 0) {
2155 snprintf(buf, sizeof(buf), "$%s", state_name + name_len);
2156 return buf;
2157 } else if (state_name[0] == '*' && strcmp(state_name + 1, param_name) == 0) {
2158 return "*$";
2159 }
2160 return NULL;
2161 }
2162
2163 const char *get_param_name_var_sym(const char *name, struct symbol *sym)
2164 {
2165 if (!sym || !sym->ident)
2166 return NULL;
2167
2168 return state_name_to_param_name(name, sym->ident->name);
2169 }
2170
2171 const char *get_param_name(struct sm_state *sm)
2172 {
2173 return get_param_name_var_sym(sm->name, sm->sym);
2174 }
2175
2176 char *get_data_info_name(struct expression *expr)
2177 {
2178 struct symbol *sym;
2179 char *name;
2180 char buf[256];
2181 char *ret = NULL;
2182
2183 expr = strip_expr(expr);
2184 name = get_member_name(expr);
2185 if (name)
2186 return name;
2187 name = expr_to_var_sym(expr, &sym);
2188 if (!name || !sym)
2189 goto free;
2190 if (!(sym->ctype.modifiers & MOD_TOPLEVEL))
2191 goto free;
2192 if (sym->ctype.modifiers & MOD_STATIC)
2193 snprintf(buf, sizeof(buf), "static %s", name);
2194 else
2195 snprintf(buf, sizeof(buf), "global %s", name);
2196 ret = alloc_sname(buf);
2197 free:
2198 free_string(name);
2199 return ret;
2200 }
Static analysis for C