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 <unistd.h>
21 #include <ctype.h>
22 #include "smatch.h"
23 #include "smatch_slist.h"
24 #include "smatch_extra.h"
25 
26 struct sqlite3 *smatch_db;
27 struct sqlite3 *mem_db;
28 struct sqlite3 *cache_db;
29 
30 int debug_db;
31 
32 static int return_id;
33 
34 static void call_return_state_hooks(struct expression *expr);
35 
36 #define SQLITE_CACHE_PAGES 1000
37 
38 struct def_callback {
39 	int hook_type;
40 	void (*callback)(const char *name, struct symbol *sym, char *key, char *value);
41 };
42 ALLOCATOR(def_callback, "definition db hook callbacks");
43 DECLARE_PTR_LIST(callback_list, struct def_callback);
44 static struct callback_list *select_caller_info_callbacks;
45 
46 struct member_info_callback {
47 	int owner;
48 	void (*callback)(struct expression *call, int param, char *printed_name, struct sm_state *sm);
49 };
50 ALLOCATOR(member_info_callback, "caller_info callbacks");
51 DECLARE_PTR_LIST(member_info_cb_list, struct member_info_callback);
52 static struct member_info_cb_list *member_callbacks;
53 
54 struct returned_state_callback {
55 	void (*callback)(int return_id, char *return_ranges, struct expression *return_expr);
56 };
57 ALLOCATOR(returned_state_callback, "returned state callbacks");
58 DECLARE_PTR_LIST(returned_state_cb_list, struct returned_state_callback);
59 static struct returned_state_cb_list *returned_state_callbacks;
60 
61 struct returned_member_callback {
62 	int owner;
63 	void (*callback)(int return_id, char *return_ranges, struct expression *expr, char *printed_name, struct smatch_state *state);
64 };
65 ALLOCATOR(returned_member_callback, "returned member callbacks");
66 DECLARE_PTR_LIST(returned_member_cb_list, struct returned_member_callback);
67 static struct returned_member_cb_list *returned_member_callbacks;
68 
69 struct db_implies_callback {
70 	int type;
71 	void (*callback)(struct expression *call, struct expression *arg, char *key, char *value);
72 };
73 ALLOCATOR(db_implies_callback, "return_implies callbacks");
74 DECLARE_PTR_LIST(db_implies_cb_list, struct db_implies_callback);
75 static struct db_implies_cb_list *return_implies_cb_list;
76 static struct db_implies_cb_list *call_implies_cb_list;
77 
78 /* silently truncates if needed. */
79 char *escape_newlines(const char *str)
80 {
81 	char buf[1024] = "";
82 	bool found = false;
83 	int i, j;
84 
85 	for (i = 0, j = 0; str[i] != '\0' && j != sizeof(buf); i++, j++) {
86 		if (str[i] != '\r' && str[i] != '\n') {
87 			buf[j] = str[i];
88 			continue;
89 		}
90 
91 		found = true;
92 		buf[j++] = '\\';
93 		if (j == sizeof(buf))
94 			 break;
95 		buf[j] = 'n';
96 	}
97 
98 	if (!found)
99 		return alloc_sname(str);
100 
101 	if (j == sizeof(buf))
102 		buf[j - 1] = '\0';
103 	return alloc_sname(buf);
104 }
105 
106 static int print_sql_output(void *unused, int argc, char **argv, char **azColName)
107 {
108 	int i;
109 
110 	for (i = 0; i < argc; i++) {
111 		if (i != 0)
112 			sm_printf(", ");
113 		sm_printf("%s", argv[i]);
114 	}
115 	sm_printf("\n");
116 	return 0;
117 }
118 
119 void sql_exec(struct sqlite3 *db, int (*callback)(void*, int, char**, char**), void *data, const char *sql)
120 {
121 	char *err = NULL;
122 	int rc;
123 
124 	if (!db)
125 		return;
126 
127 	if (option_debug || debug_db) {
128 		sm_msg("%s", sql);
129 		if (strncasecmp(sql, "select", strlen("select")) == 0)
130 			sqlite3_exec(db, sql, print_sql_output, NULL, NULL);
131 	}
132 
133 	rc = sqlite3_exec(db, sql, callback, data, &err);
134 	if (rc != SQLITE_OK && !parse_error) {
135 		sm_ierror("%s:%d SQL error #2: %s\n", get_filename(), get_lineno(), err);
136 		sm_ierror("%s:%d SQL: '%s'\n", get_filename(), get_lineno(), sql);
137 		parse_error = 1;
138 	}
139 }
140 
141 static int replace_count;
142 static char **replace_table;
143 static const char *replace_return_ranges(const char *return_ranges)
144 {
145 	int i;
146 
147 	if (!get_function()) {
148 		/* I have no idea why EXPORT_SYMBOL() is here */
149 		return return_ranges;
150 	}
151 	for (i = 0; i < replace_count; i += 3) {
152 		if (strcmp(replace_table[i + 0], get_function()) == 0) {
153 			if (strcmp(replace_table[i + 1], return_ranges) == 0)
154 				return replace_table[i + 2];
155 		}
156 	}
157 	return return_ranges;
158 }
159 
160 
161 static char *use_states;
162 static int get_db_state_count(void)
163 {
164 	struct sm_state *sm;
165 	int count = 0;
166 
167 	FOR_EACH_SM(__get_cur_stree(), sm) {
168 		if (sm->owner == USHRT_MAX)
169 			continue;
170 		if (use_states[sm->owner])
171 			count++;
172 	} END_FOR_EACH_SM(sm);
173 	return count;
174 }
175 
176 void db_ignore_states(int id)
177 {
178 	use_states[id] = 0;
179 }
180 
181 void sql_insert_return_states(int return_id, const char *return_ranges,
182 		int type, int param, const char *key, const char *value)
183 {
184 	if (key && strlen(key) >= 80)
185 		return;
186 	return_ranges = replace_return_ranges(return_ranges);
187 	sql_insert(return_states, "'%s', '%s', %lu, %d, '%s', %d, %d, %d, '%s', '%s'",
188 		   get_base_file(), get_function(), (unsigned long)__inline_fn,
189 		   return_id, return_ranges, fn_static(), type, param, key, value);
190 }
191 
192 static struct string_list *common_funcs;
193 static int is_common_function(const char *fn)
194 {
195 	char *tmp;
196 
197 	if (!fn)
198 		return 0;
199 
200 	if (strncmp(fn, "__builtin_", 10) == 0)
201 		return 1;
202 
203 	FOR_EACH_PTR(common_funcs, tmp) {
204 		if (strcmp(tmp, fn) == 0)
205 			return 1;
206 	} END_FOR_EACH_PTR(tmp);
207 
208 	return 0;
209 }
210 
211 static char *function_signature(void)
212 {
213 	return type_to_str(get_real_base_type(cur_func_sym));
214 }
215 
216 void sql_insert_caller_info(struct expression *call, int type,
217 		int param, const char *key, const char *value)
218 {
219 	FILE *tmp_fd = sm_outfd;
220 	char *fn;
221 
222 	if (!option_info && !__inline_call)
223 		return;
224 
225 	if (key && strlen(key) >= 80)
226 		return;
227 
228 	fn = get_fnptr_name(call->fn);
229 	if (!fn)
230 		return;
231 
232 	if (__inline_call) {
233 		mem_sql(NULL, NULL,
234 			"insert into caller_info values ('%s', '%s', '%s', %lu, %d, %d, %d, '%s', '%s');",
235 			get_base_file(), get_function(), fn, (unsigned long)call,
236 			is_static(call->fn), type, param, key, value);
237 	}
238 
239 	if (!option_info)
240 		return;
241 
242 	if (strncmp(fn, "__builtin_", 10) == 0)
243 		return;
244 	if (type != INTERNAL && is_common_function(fn))
245 		return;
246 
247 	sm_outfd = caller_info_fd;
248 	sm_msg("SQL_caller_info: insert into caller_info values ("
249 	       "'%s', '%s', '%s', %%CALL_ID%%, %d, %d, %d, '%s', '%s');",
250 	       get_base_file(), get_function(), fn, is_static(call->fn),
251 	       type, param, key, value);
252 	sm_outfd = tmp_fd;
253 
254 	free_string(fn);
255 }
256 
257 void sql_insert_function_ptr(const char *fn, const char *struct_name)
258 {
259 	sql_insert_or_ignore(function_ptr, "'%s', '%s', '%s', 0",
260 			     get_base_file(), fn, struct_name);
261 }
262 
263 void sql_insert_return_implies(int type, int param, const char *key, const char *value)
264 {
265 	sql_insert_or_ignore(return_implies, "'%s', '%s', %lu, %d, %d, %d, '%s', '%s'",
266 		get_base_file(), get_function(), (unsigned long)__inline_fn,
267 		fn_static(), type, param, key, value);
268 }
269 
270 void sql_insert_call_implies(int type, int param, const char *key, const char *value)
271 {
272 	sql_insert_or_ignore(call_implies, "'%s', '%s', %lu, %d, %d, %d, '%s', '%s'",
273 		get_base_file(), get_function(), (unsigned long)__inline_fn,
274 		fn_static(), type, param, key, value);
275 }
276 
277 void sql_insert_function_type_size(const char *member, const char *ranges)
278 {
279 	sql_insert(function_type_size, "'%s', '%s', '%s', '%s'", get_base_file(), get_function(), member, ranges);
280 }
281 
282 void sql_insert_function_type_info(int type, const char *struct_type, const char *member, const char *value)
283 {
284 	sql_insert(function_type_info, "'%s', '%s', %d, '%s', '%s', '%s'", get_base_file(), get_function(), type, struct_type, member, value);
285 }
286 
287 void sql_insert_type_info(int type, const char *member, const char *value)
288 {
289 	sql_insert_cache(type_info, "'%s', %d, '%s', '%s'", get_base_file(), type, member, value);
290 }
291 
292 void sql_insert_local_values(const char *name, const char *value)
293 {
294 	sql_insert(local_values, "'%s', '%s', '%s'", get_base_file(), name, value);
295 }
296 
297 void sql_insert_function_type_value(const char *type, const char *value)
298 {
299 	sql_insert(function_type_value, "'%s', '%s', '%s', '%s'", get_base_file(), get_function(), type, value);
300 }
301 
302 void sql_insert_function_type(int param, const char *value)
303 {
304 	sql_insert(function_type, "'%s', '%s', %d, %d, '%s'",
305 		   get_base_file(), get_function(), fn_static(), param, value);
306 }
307 
308 void sql_insert_parameter_name(int param, const char *value)
309 {
310 	sql_insert(parameter_name, "'%s', '%s', %d, %d, '%s'",
311 		   get_base_file(), get_function(), fn_static(), param, value);
312 }
313 
314 void sql_insert_data_info(struct expression *data, int type, const char *value)
315 {
316 	char *data_name;
317 
318 	data_name = get_data_info_name(data);
319 	if (!data_name)
320 		return;
321 	sql_insert(data_info, "'%s', '%s', %d, '%s'",
322 		   is_static(data) ? get_base_file() : "extern",
323 		   data_name, type, value);
324 }
325 
326 void sql_insert_data_info_var_sym(const char *var, struct symbol *sym, int type, const char *value)
327 {
328 	sql_insert(data_info, "'%s', '%s', %d, '%s'",
329 		   (sym->ctype.modifiers & MOD_STATIC) ? get_base_file() : "extern",
330 		   var, type, value);
331 }
332 
333 void sql_save_constraint(const char *con)
334 {
335 	if (!option_info)
336 		return;
337 
338         sm_msg("SQL: insert or ignore into constraints (str) values('%s');", escape_newlines(con));
339 }
340 
341 void sql_save_constraint_required(const char *data, int op, const char *limit)
342 {
343 	sql_insert_or_ignore(constraints_required, "'%s', '%s', '%s'", data, show_special(op), limit);
344 }
345 
346 void sql_copy_constraint_required(const char *new_limit, const char *old_limit)
347 {
348 	if (!option_info)
349 		return;
350 
351 	sm_msg("SQL_late: insert or ignore into constraints_required (data, op, bound) "
352 		"select constraints_required.data, constraints_required.op, '%s' from "
353 		"constraints_required where bound = '%s';", new_limit, old_limit);
354 }
355 
356 void sql_insert_fn_ptr_data_link(const char *ptr, const char *data)
357 {
358 	sql_insert_or_ignore(fn_ptr_data_link, "'%s', '%s'", ptr, data);
359 }
360 
361 void sql_insert_fn_data_link(struct expression *fn, int type, int param, const char *key, const char *value)
362 {
363 	if (fn->type != EXPR_SYMBOL || !fn->symbol->ident)
364 		return;
365 
366 	sql_insert(fn_data_link, "'%s', '%s', %d, %d, %d, '%s', '%s'",
367 		   (fn->symbol->ctype.modifiers & MOD_STATIC) ? get_base_file() : "extern",
368 		   fn->symbol->ident->name,
369 		   !!(fn->symbol->ctype.modifiers & MOD_STATIC),
370 		   type, param, key, value);
371 }
372 
373 void sql_insert_mtag_about(mtag_t tag, const char *left_name, const char *right_name)
374 {
375 	sql_insert(mtag_about, "%lld, '%s', '%s', %d, '%s', '%s'",
376 		   tag, get_filename(), get_function(), get_lineno(), left_name, right_name);
377 }
378 
379 void sql_insert_mtag_map(mtag_t tag, int offset, mtag_t container)
380 {
381 	sql_insert(mtag_map, "%lld, %d, %lld", tag, offset, container);
382 }
383 
384 void sql_insert_mtag_alias(mtag_t orig, mtag_t alias)
385 {
386 	sql_insert(mtag_alias, "%lld, %lld", orig, alias);
387 }
388 
389 static int save_mtag(void *_tag, int argc, char **argv, char **azColName)
390 {
391 	mtag_t *saved_tag = _tag;
392 	mtag_t new_tag;
393 
394 	new_tag = strtoll(argv[0], NULL, 10);
395 
396 	if (!*saved_tag)
397 		*saved_tag = new_tag;
398 	else if (*saved_tag != new_tag)
399 		*saved_tag = -1ULL;
400 
401 	return 0;
402 }
403 
404 int mtag_map_select_container(mtag_t tag, int offset, mtag_t *container)
405 {
406 	mtag_t tmp = 0;
407 
408 	run_sql(save_mtag, &tmp,
409 		"select container from mtag_map where tag = %lld and offset = %d;",
410 		tag, offset);
411 
412 	if (tmp == 0 || tmp == -1ULL)
413 		return 0;
414 	*container = tmp;
415 	return 1;
416 }
417 
418 int mtag_map_select_tag(mtag_t container, int offset, mtag_t *tag)
419 {
420 	mtag_t tmp = 0;
421 
422 	run_sql(save_mtag, &tmp,
423 		"select tag from mtag_map where container = %lld and offset = %d;",
424 		container, offset);
425 
426 	if (tmp == 0 || tmp == -1ULL)
427 		return 0;
428 	*tag = tmp;
429 	return 1;
430 }
431 
432 char *get_static_filter(struct symbol *sym)
433 {
434 	static char sql_filter[1024];
435 
436 	/* This can only happen on buggy code.  Return invalid SQL. */
437 	if (!sym) {
438 		sql_filter[0] = '\0';
439 		return sql_filter;
440 	}
441 
442 	if (sym->ctype.modifiers & MOD_STATIC) {
443 		snprintf(sql_filter, sizeof(sql_filter),
444 			 "file = '%s' and function = '%s' and static = '1'",
445 			 get_base_file(), sym->ident->name);
446 	} else {
447 		snprintf(sql_filter, sizeof(sql_filter),
448 			 "function = '%s' and static = '0'", sym->ident->name);
449 	}
450 
451 	return sql_filter;
452 }
453 
454 static int get_row_count(void *_row_count, int argc, char **argv, char **azColName)
455 {
456 	int *row_count = _row_count;
457 
458 	*row_count = 0;
459 	if (argc != 1)
460 		return 0;
461 	*row_count = atoi(argv[0]);
462 	return 0;
463 }
464 
465 static void mark_call_params_untracked(struct expression *call)
466 {
467 	struct expression *arg;
468 	int i = 0;
469 
470 	FOR_EACH_PTR(call->args, arg) {
471 		mark_untracked(call, i++, "$", NULL);
472 	} END_FOR_EACH_PTR(arg);
473 }
474 
475 static void sql_select_return_states_pointer(const char *cols,
476 	struct expression *call, int (*callback)(void*, int, char**, char**), void *info)
477 {
478 	char *ptr;
479 	int return_count = 0;
480 
481 	ptr = get_fnptr_name(call->fn);
482 	if (!ptr)
483 		return;
484 
485 	run_sql(get_row_count, &return_count,
486 		"select count(*) from return_states join function_ptr "
487 		"where return_states.function == function_ptr.function and "
488 		"ptr = '%s' and searchable = 1 and type = %d;", ptr, INTERNAL);
489 	/* The magic number 100 is just from testing on the kernel. */
490 	if (return_count > 100) {
491 		mark_call_params_untracked(call);
492 		return;
493 	}
494 
495 	run_sql(callback, info,
496 		"select %s from return_states join function_ptr where "
497 		"return_states.function == function_ptr.function and ptr = '%s' "
498 		"and searchable = 1 "
499 		"order by function_ptr.file, return_states.file, return_id, type;",
500 		cols, ptr);
501 }
502 
503 static int is_local_symbol(struct expression *expr)
504 {
505 	if (expr->type != EXPR_SYMBOL)
506 		return 0;
507 	if (expr->symbol->ctype.modifiers & (MOD_NONLOCAL | MOD_STATIC | MOD_ADDRESSABLE))
508 		return 0;
509 	return 1;
510 }
511 
512 void sql_select_return_states(const char *cols, struct expression *call,
513 	int (*callback)(void*, int, char**, char**), void *info)
514 {
515 	struct expression *fn;
516 	int row_count = 0;
517 
518 	if (is_fake_call(call))
519 		return;
520 
521 	fn = strip_expr(call->fn);
522 	if (fn->type != EXPR_SYMBOL || !fn->symbol || is_local_symbol(fn)) {
523 		sql_select_return_states_pointer(cols, call, callback, info);
524 		return;
525 	}
526 
527 	if (inlinable(fn)) {
528 		mem_sql(callback, info,
529 			"select %s from return_states where call_id = '%lu' order by return_id, type;",
530 			cols, (unsigned long)call);
531 		return;
532 	}
533 
534 	run_sql(get_row_count, &row_count, "select count(*) from return_states where %s;",
535 		get_static_filter(fn->symbol));
536 	if (row_count > 3000)
537 		return;
538 
539 	run_sql(callback, info, "select %s from return_states where %s order by file, return_id, type;",
540 		cols, get_static_filter(fn->symbol));
541 }
542 
543 #define CALL_IMPLIES 0
544 #define RETURN_IMPLIES 1
545 
546 struct implies_info {
547 	int type;
548 	struct db_implies_cb_list *cb_list;
549 	struct expression *expr;
550 	struct symbol *sym;
551 };
552 
553 void sql_select_implies(const char *cols, struct implies_info *info,
554 	int (*callback)(void*, int, char**, char**))
555 {
556 	if (info->type == RETURN_IMPLIES && inlinable(info->expr->fn)) {
557 		mem_sql(callback, info,
558 			"select %s from return_implies where call_id = '%lu';",
559 			cols, (unsigned long)info->expr);
560 		return;
561 	}
562 
563 	run_sql(callback, info, "select %s from %s_implies where %s;",
564 		cols,
565 		info->type == CALL_IMPLIES ? "call" : "return",
566 		get_static_filter(info->sym));
567 }
568 
569 struct select_caller_info_data {
570 	struct stree *final_states;
571 	struct timeval start_time;
572 	int prev_func_id;
573 	int ignore;
574 	int results;
575 };
576 
577 static int caller_info_callback(void *_data, int argc, char **argv, char **azColName);
578 
579 static void sql_select_caller_info(struct select_caller_info_data *data,
580 	const char *cols, struct symbol *sym)
581 {
582 	if (__inline_fn) {
583 		mem_sql(caller_info_callback, data,
584 			"select %s from caller_info where call_id = %lu;",
585 			cols, (unsigned long)__inline_fn);
586 		return;
587 	}
588 
589 	if (sym->ident->name && is_common_function(sym->ident->name))
590 		return;
591 	run_sql(caller_info_callback, data,
592 		"select %s from common_caller_info where %s order by call_id;",
593 		cols, get_static_filter(sym));
594 	if (data->results)
595 		return;
596 
597 	run_sql(caller_info_callback, data,
598 		"select %s from caller_info where %s order by call_id;",
599 		cols, get_static_filter(sym));
600 }
601 
602 void select_caller_info_hook(void (*callback)(const char *name, struct symbol *sym, char *key, char *value), int type)
603 {
604 	struct def_callback *def_callback = __alloc_def_callback(0);
605 
606 	def_callback->hook_type = type;
607 	def_callback->callback = callback;
608 	add_ptr_list(&select_caller_info_callbacks, def_callback);
609 }
610 
611 /*
612  * These call backs are used when the --info option is turned on to print struct
613  * member information.  For example foo->bar could have a state in
614  * smatch_extra.c and also check_user.c.
615  */
616 void add_member_info_callback(int owner, void (*callback)(struct expression *call, int param, char *printed_name, struct sm_state *sm))
617 {
618 	struct member_info_callback *member_callback = __alloc_member_info_callback(0);
619 
620 	member_callback->owner = owner;
621 	member_callback->callback = callback;
622 	add_ptr_list(&member_callbacks, member_callback);
623 }
624 
625 void add_split_return_callback(void (*fn)(int return_id, char *return_ranges, struct expression *returned_expr))
626 {
627 	struct returned_state_callback *callback = __alloc_returned_state_callback(0);
628 
629 	callback->callback = fn;
630 	add_ptr_list(&returned_state_callbacks, callback);
631 }
632 
633 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))
634 {
635 	struct returned_member_callback *member_callback = __alloc_returned_member_callback(0);
636 
637 	member_callback->owner = owner;
638 	member_callback->callback = callback;
639 	add_ptr_list(&returned_member_callbacks, member_callback);
640 }
641 
642 void select_call_implies_hook(int type, void (*callback)(struct expression *call, struct expression *arg, char *key, char *value))
643 {
644 	struct db_implies_callback *cb = __alloc_db_implies_callback(0);
645 
646 	cb->type = type;
647 	cb->callback = callback;
648 	add_ptr_list(&call_implies_cb_list, cb);
649 }
650 
651 void select_return_implies_hook(int type, void (*callback)(struct expression *call, struct expression *arg, char *key, char *value))
652 {
653 	struct db_implies_callback *cb = __alloc_db_implies_callback(0);
654 
655 	cb->type = type;
656 	cb->callback = callback;
657 	add_ptr_list(&return_implies_cb_list, cb);
658 }
659 
660 struct return_info {
661 	struct expression *static_returns_call;
662 	struct symbol *return_type;
663 	struct range_list *return_range_list;
664 };
665 
666 static int db_return_callback(void *_ret_info, int argc, char **argv, char **azColName)
667 {
668 	struct return_info *ret_info = _ret_info;
669 	struct range_list *rl;
670 	struct expression *call_expr = ret_info->static_returns_call;
671 
672 	if (argc != 1)
673 		return 0;
674 	call_results_to_rl(call_expr, ret_info->return_type, argv[0], &rl);
675 	ret_info->return_range_list = rl_union(ret_info->return_range_list, rl);
676 	return 0;
677 }
678 
679 struct range_list *db_return_vals(struct expression *expr)
680 {
681 	struct return_info ret_info = {};
682 	char buf[64];
683 	struct sm_state *sm;
684 
685 	if (is_fake_call(expr))
686 		return NULL;
687 
688 	snprintf(buf, sizeof(buf), "return %p", expr);
689 	sm = get_sm_state(SMATCH_EXTRA, buf, NULL);
690 	if (sm)
691 		return clone_rl(estate_rl(sm->state));
692 	ret_info.static_returns_call = expr;
693 	ret_info.return_type = get_type(expr);
694 	if (!ret_info.return_type)
695 		return NULL;
696 
697 	if (expr->fn->type != EXPR_SYMBOL || !expr->fn->symbol)
698 		return NULL;
699 
700 	ret_info.return_range_list = NULL;
701 	if (inlinable(expr->fn)) {
702 		mem_sql(db_return_callback, &ret_info,
703 			"select distinct return from return_states where call_id = '%lu';",
704 			(unsigned long)expr);
705 	} else {
706 		run_sql(db_return_callback, &ret_info,
707 			"select distinct return from return_states where %s;",
708 			get_static_filter(expr->fn->symbol));
709 	}
710 	return ret_info.return_range_list;
711 }
712 
713 struct range_list *db_return_vals_from_str(const char *fn_name)
714 {
715 	struct return_info ret_info;
716 
717 	ret_info.static_returns_call = NULL;
718 	ret_info.return_type = &llong_ctype;
719 	ret_info.return_range_list = NULL;
720 
721 	run_sql(db_return_callback, &ret_info,
722 		"select distinct return from return_states where function = '%s';",
723 		fn_name);
724 	return ret_info.return_range_list;
725 }
726 
727 /*
728  * This is used when we have a function that takes a function pointer as a
729  * parameter.  "frob(blah, blah, my_function);"  We know that the return values
730  * from frob() come from my_funcion() so we want to find the possible returns
731  * of my_function(), but we don't know which arguments are passed to it.
732  *
733  */
734 struct range_list *db_return_vals_no_args(struct expression *expr)
735 {
736 	struct return_info ret_info = {};
737 
738 	if (!expr || expr->type != EXPR_SYMBOL)
739 		return NULL;
740 
741 	ret_info.static_returns_call = expr;
742 	ret_info.return_type = get_type(expr);
743 	ret_info.return_type = get_real_base_type(ret_info.return_type);
744 	if (!ret_info.return_type)
745 		return NULL;
746 
747 	run_sql(db_return_callback, &ret_info,
748 		"select distinct return from return_states where %s;",
749 		get_static_filter(expr->symbol));
750 
751 	return ret_info.return_range_list;
752 }
753 
754 static void match_call_marker(struct expression *expr)
755 {
756 	struct symbol *type;
757 
758 	type = get_type(expr->fn);
759 	if (type && type->type == SYM_PTR)
760 		type = get_real_base_type(type);
761 
762 	/*
763 	 * we just want to record something in the database so that if we have
764 	 * two calls like:  frob(4); frob(some_unkown); then on the receiving
765 	 * side we know that sometimes frob is called with unknown parameters.
766 	 */
767 
768 	sql_insert_caller_info(expr, INTERNAL, -1, "%call_marker%", type_to_str(type));
769 }
770 
771 static char *show_offset(int offset)
772 {
773 	static char buf[64];
774 
775 	buf[0] = '\0';
776 	if (offset != -1)
777 		snprintf(buf, sizeof(buf), "(-%d)", offset);
778 	return buf;
779 }
780 
781 int is_recursive_member(const char *name)
782 {
783 	char buf[256];
784 	const char *p, *next;
785 	int size;
786 
787 	p = strchr(name, '>');
788 	if (!p)
789 		return 0;
790 	p++;
791 	while (true) {
792 		next = strchr(p, '>');
793 		if (!next)
794 			return 0;
795 		next++;
796 
797 		size = next - p;
798 		if (size >= sizeof(buf))
799 			return 0;
800 		memcpy(buf, p, size);
801 		buf[size] = '\0';
802 		if (strstr(next, buf))
803 			return 1;
804 		p = next;
805 	}
806 }
807 
808 char *sm_to_arg_name(struct expression *expr, struct sm_state *sm)
809 {
810 	struct symbol *sym;
811 	const char *sm_name;
812 	char *name;
813 	bool is_address = false;
814 	bool add_star = false;
815 	char buf[256];
816 	char *ret = NULL;
817 	int len;
818 
819 	expr = strip_expr(expr);
820 	if (!expr)
821 		return NULL;
822 
823 	if (expr->type == EXPR_PREOP && expr->op == '&') {
824 		expr = strip_expr(expr->unop);
825 		is_address = true;
826 	}
827 
828 	name = expr_to_var_sym(expr, &sym);
829 	if (!name || !sym)
830 		goto free;
831 	if (sym != sm->sym)
832 		goto free;
833 
834 	sm_name = sm->name;
835 	add_star = false;
836 	if (sm_name[0] == '*') {
837 		add_star = true;
838 		sm_name++;
839 	}
840 
841 	len = strlen(name);
842 	if (strncmp(name, sm_name, len) != 0)
843 		goto free;
844 	if (sm_name[len] == '\0') {
845 		snprintf(buf, sizeof(buf), "%s%s$",
846 			 add_star ? "*" : "", is_address ? "*" : "");
847 	} else {
848 		if (sm_name[len] != '.' && sm_name[len] != '-')
849 			goto free;
850 		if (sm_name[len] == '-')
851 			len++;
852 		// FIXME does is_address really imply that sm_name[len] == '-'
853 		snprintf(buf, sizeof(buf), "%s$->%s", add_star ? "*" : "",
854 			 sm_name + len);
855 	}
856 
857 	ret = alloc_sname(buf);
858 free:
859 	free_string(name);
860 	return ret;
861 }
862 
863 static void print_struct_members(struct expression *call, struct expression *expr, int param, int offset, struct stree *stree,
864 	void (*callback)(struct expression *call, int param, char *printed_name, struct sm_state *sm))
865 {
866 	struct sm_state *sm;
867 	const char *sm_name;
868 	char *name;
869 	struct symbol *sym;
870 	int len;
871 	char printed_name[256];
872 	int is_address = 0;
873 	bool add_star;
874 	struct symbol *type;
875 
876 	expr = strip_expr(expr);
877 	if (!expr)
878 		return;
879 	type = get_type(expr);
880 	if (type && type_bits(type) < type_bits(&ulong_ctype))
881 		return;
882 
883 	if (expr->type == EXPR_PREOP && expr->op == '&') {
884 		expr = strip_expr(expr->unop);
885 		is_address = 1;
886 	}
887 
888 	name = expr_to_var_sym(expr, &sym);
889 	if (!name || !sym)
890 		goto free;
891 
892 	len = strlen(name);
893 	FOR_EACH_SM(stree, sm) {
894 		if (sm->sym != sym)
895 			continue;
896 		sm_name = sm->name;
897 		add_star = false;
898 		if (sm_name[0] == '*') {
899 			add_star = true;
900 			sm_name++;
901 		}
902 		// FIXME: simplify?
903 		if (!add_star && strcmp(name, sm_name) == 0) {
904 			if (is_address)
905 				snprintf(printed_name, sizeof(printed_name), "*$%s", show_offset(offset));
906 			else /* these are already handled. fixme: handle them here */
907 				continue;
908 		} else if (add_star && strcmp(name, sm_name) == 0) {
909 			snprintf(printed_name, sizeof(printed_name), "%s*$%s",
910 				 is_address ? "*" : "", show_offset(offset));
911 		} else if (strncmp(name, sm_name, len) == 0) {
912 			if (sm_name[len] != '.' && sm_name[len] != '-')
913 				continue;
914 			if (is_address)
915 				snprintf(printed_name, sizeof(printed_name),
916 					 "%s$%s->%s", add_star ? "*" : "",
917 					 show_offset(offset), sm_name + len + 1);
918 			else
919 				snprintf(printed_name, sizeof(printed_name),
920 					 "%s$%s%s", add_star ? "*" : "",
921 					 show_offset(offset), sm_name + len);
922 		} else {
923 			continue;
924 		}
925 		if (is_recursive_member(printed_name))
926 			continue;
927 		callback(call, param, printed_name, sm);
928 	} END_FOR_EACH_SM(sm);
929 free:
930 	free_string(name);
931 }
932 
933 static int param_used_callback(void *_container, int argc, char **argv, char **azColName)
934 {
935 	char **container = _container;
936 	static char buf[256];
937 
938 	snprintf(buf, sizeof(buf), "%s", argv[0]);
939 	*container = buf;
940 	return 0;
941 }
942 
943 static void print_container_struct_members(struct expression *call, struct expression *expr, int param, struct stree *stree,
944 	void (*callback)(struct expression *call, int param, char *printed_name, struct sm_state *sm))
945 {
946 	struct expression *tmp;
947 	char *container = NULL;
948 	int offset;
949 	int holder_offset;
950 	char *p;
951 
952 	if (!call->fn || call->fn->type != EXPR_SYMBOL || !call->fn->symbol)
953 		return;
954 
955 	/*
956 	 * We can't use the in-mem DB because we have to parse the function
957 	 * first, then we know if it takes a container, then we know to pass it
958 	 * the container data.
959 	 *
960 	 */
961 	run_sql(&param_used_callback, &container,
962 		"select key from return_implies where %s and type = %d and key like '%%$(%%' and parameter = %d limit 1;",
963 		get_static_filter(call->fn->symbol), CONTAINER, param);
964 	if (!container)
965 		return;
966 
967 	p = strchr(container, '-');
968 	if (!p)
969 		return;
970 	offset = atoi(p);
971 	p = strchr(p, ')');
972 	if (!p)
973 		return;
974 	p++;
975 
976 	tmp = get_assigned_expr(expr);
977 	if (tmp)
978 		expr = tmp;
979 
980 	if (expr->type != EXPR_PREOP || expr->op != '&')
981 		return;
982 	expr = strip_expr(expr->unop);
983 	holder_offset = get_member_offset_from_deref(expr);
984 	if (-holder_offset != offset)
985 		return;
986 
987 	expr = strip_expr(expr->deref);
988 	if (expr->type == EXPR_PREOP && expr->op == '*')
989 		expr = strip_expr(expr->unop);
990 
991 	print_struct_members(call, expr, param, holder_offset, stree, callback);
992 }
993 
994 static void match_call_info(struct expression *call)
995 {
996 	struct member_info_callback *cb;
997 	struct expression *arg;
998 	struct stree *stree;
999 	char *name;
1000 	int i;
1001 
1002 	name = get_fnptr_name(call->fn);
1003 	if (!name)
1004 		return;
1005 
1006 	FOR_EACH_PTR(member_callbacks, cb) {
1007 		stree = get_all_states_stree(cb->owner);
1008 		i = 0;
1009 		FOR_EACH_PTR(call->args, arg) {
1010 			print_struct_members(call, arg, i, -1, stree, cb->callback);
1011 			print_container_struct_members(call, arg, i, stree, cb->callback);
1012 			i++;
1013 		} END_FOR_EACH_PTR(arg);
1014 		free_stree(&stree);
1015 	} END_FOR_EACH_PTR(cb);
1016 
1017 	free_string(name);
1018 }
1019 
1020 static int get_param(int param, char **name, struct symbol **sym)
1021 {
1022 	struct symbol *arg;
1023 	int i;
1024 
1025 	i = 0;
1026 	FOR_EACH_PTR(cur_func_sym->ctype.base_type->arguments, arg) {
1027 		/*
1028 		 * this is a temporary hack to work around a bug (I think in sparse?)
1029 		 * 2.6.37-rc1:fs/reiserfs/journal.o
1030 		 * If there is a function definition without parameter name found
1031 		 * after a function implementation then it causes a crash.
1032 		 * int foo() {}
1033 		 * int bar(char *);
1034 		 */
1035 		if (arg->ident->name < (char *)100)
1036 			continue;
1037 		if (i == param) {
1038 			*name = arg->ident->name;
1039 			*sym = arg;
1040 			return TRUE;
1041 		}
1042 		i++;
1043 	} END_FOR_EACH_PTR(arg);
1044 
1045 	return FALSE;
1046 }
1047 
1048 static int function_signature_matches(const char *sig)
1049 {
1050 	char *my_sig;
1051 
1052 	my_sig = function_signature();
1053 	if (!sig || !my_sig)
1054 		return 1;  /* default to matching */
1055 	if (strcmp(my_sig, sig) == 0)
1056 		  return 1;
1057 	return 0;
1058 }
1059 
1060 static int caller_info_callback(void *_data, int argc, char **argv, char **azColName)
1061 {
1062 	struct select_caller_info_data *data = _data;
1063 	int func_id;
1064 	long type;
1065 	long param;
1066 	char *key;
1067 	char *value;
1068 	char *name = NULL;
1069 	struct symbol *sym = NULL;
1070 	struct def_callback *def_callback;
1071 	struct stree *stree;
1072 	struct timeval cur_time;
1073 
1074 	data->results = 1;
1075 
1076 	if (argc != 5)
1077 		return 0;
1078 
1079 	gettimeofday(&cur_time, NULL);
1080 	if (cur_time.tv_sec - data->start_time.tv_sec > 10)
1081 		return 0;
1082 
1083 	func_id = atoi(argv[0]);
1084 	errno = 0;
1085 	type = strtol(argv[1], NULL, 10);
1086 	param = strtol(argv[2], NULL, 10);
1087 	if (errno)
1088 		return 0;
1089 	key = argv[3];
1090 	value = argv[4];
1091 
1092 	if (data->prev_func_id == -1)
1093 		data->prev_func_id = func_id;
1094 	if (func_id != data->prev_func_id) {
1095 		stree = __pop_fake_cur_stree();
1096 		if (!data->ignore)
1097 			merge_stree(&data->final_states, stree);
1098 		free_stree(&stree);
1099 		__push_fake_cur_stree();
1100 		__unnullify_path();
1101 		data->prev_func_id = func_id;
1102 		data->ignore = 0;
1103 	}
1104 
1105 	if (data->ignore)
1106 		return 0;
1107 	if (type == INTERNAL &&
1108 	    !function_signature_matches(value)) {
1109 		data->ignore = 1;
1110 		return 0;
1111 	}
1112 
1113 	if (param >= 0 && !get_param(param, &name, &sym))
1114 		return 0;
1115 
1116 	FOR_EACH_PTR(select_caller_info_callbacks, def_callback) {
1117 		if (def_callback->hook_type == type)
1118 			def_callback->callback(name, sym, key, value);
1119 	} END_FOR_EACH_PTR(def_callback);
1120 
1121 	return 0;
1122 }
1123 
1124 static struct string_list *ptr_names_done;
1125 static struct string_list *ptr_names;
1126 
1127 static int get_ptr_name(void *unused, int argc, char **argv, char **azColName)
1128 {
1129 	insert_string(&ptr_names, alloc_string(argv[0]));
1130 	return 0;
1131 }
1132 
1133 static char *get_next_ptr_name(void)
1134 {
1135 	char *ptr;
1136 
1137 	FOR_EACH_PTR(ptr_names, ptr) {
1138 		if (!insert_string(&ptr_names_done, ptr))
1139 			continue;
1140 		return ptr;
1141 	} END_FOR_EACH_PTR(ptr);
1142 	return NULL;
1143 }
1144 
1145 static void get_ptr_names(const char *file, const char *name)
1146 {
1147 	char sql_filter[1024];
1148 	int before, after;
1149 
1150 	if (file) {
1151 		snprintf(sql_filter, 1024, "file = '%s' and function = '%s';",
1152 			 file, name);
1153 	} else {
1154 		snprintf(sql_filter, 1024, "function = '%s';", name);
1155 	}
1156 
1157 	before = ptr_list_size((struct ptr_list *)ptr_names);
1158 
1159 	run_sql(get_ptr_name, NULL,
1160 		"select distinct ptr from function_ptr where %s",
1161 		sql_filter);
1162 
1163 	after = ptr_list_size((struct ptr_list *)ptr_names);
1164 	if (before == after)
1165 		return;
1166 
1167 	while ((name = get_next_ptr_name()))
1168 		get_ptr_names(NULL, name);
1169 }
1170 
1171 static void match_data_from_db(struct symbol *sym)
1172 {
1173 	struct select_caller_info_data data = { .prev_func_id = -1 };
1174 	struct sm_state *sm;
1175 	struct stree *stree;
1176 	struct timeval end_time;
1177 
1178 	if (!sym || !sym->ident)
1179 		return;
1180 
1181 	gettimeofday(&data.start_time, NULL);
1182 
1183 	__push_fake_cur_stree();
1184 	__unnullify_path();
1185 
1186 	if (!__inline_fn) {
1187 		char *ptr;
1188 
1189 		if (sym->ctype.modifiers & MOD_STATIC)
1190 			get_ptr_names(get_base_file(), sym->ident->name);
1191 		else
1192 			get_ptr_names(NULL, sym->ident->name);
1193 
1194 		if (ptr_list_size((struct ptr_list *)ptr_names) > 20) {
1195 			__free_ptr_list((struct ptr_list **)&ptr_names);
1196 			__free_ptr_list((struct ptr_list **)&ptr_names_done);
1197 			__free_fake_cur_stree();
1198 			return;
1199 		}
1200 
1201 		sql_select_caller_info(&data,
1202 				       "call_id, type, parameter, key, value",
1203 				       sym);
1204 
1205 
1206 		stree = __pop_fake_cur_stree();
1207 		if (!data.ignore)
1208 			merge_stree(&data.final_states, stree);
1209 		free_stree(&stree);
1210 		__push_fake_cur_stree();
1211 		__unnullify_path();
1212 		data.prev_func_id = -1;
1213 		data.ignore = 0;
1214 		data.results = 0;
1215 
1216 		FOR_EACH_PTR(ptr_names, ptr) {
1217 			run_sql(caller_info_callback, &data,
1218 				"select call_id, type, parameter, key, value"
1219 				" from common_caller_info where function = '%s' order by call_id",
1220 				ptr);
1221 		} END_FOR_EACH_PTR(ptr);
1222 
1223 		if (data.results) {
1224 			FOR_EACH_PTR(ptr_names, ptr) {
1225 				free_string(ptr);
1226 			} END_FOR_EACH_PTR(ptr);
1227 			goto free_ptr_names;
1228 		}
1229 
1230 		FOR_EACH_PTR(ptr_names, ptr) {
1231 			run_sql(caller_info_callback, &data,
1232 				"select call_id, type, parameter, key, value"
1233 				" from caller_info where function = '%s' order by call_id",
1234 				ptr);
1235 			free_string(ptr);
1236 		} END_FOR_EACH_PTR(ptr);
1237 
1238 free_ptr_names:
1239 		__free_ptr_list((struct ptr_list **)&ptr_names);
1240 		__free_ptr_list((struct ptr_list **)&ptr_names_done);
1241 	} else {
1242 		sql_select_caller_info(&data,
1243 				       "call_id, type, parameter, key, value",
1244 				       sym);
1245 	}
1246 
1247 	stree = __pop_fake_cur_stree();
1248 	if (!data.ignore)
1249 		merge_stree(&data.final_states, stree);
1250 	free_stree(&stree);
1251 
1252 	gettimeofday(&end_time, NULL);
1253 	if (end_time.tv_sec - data.start_time.tv_sec <= 10) {
1254 		FOR_EACH_SM(data.final_states, sm) {
1255 			__set_sm(sm);
1256 		} END_FOR_EACH_SM(sm);
1257 	}
1258 
1259 	free_stree(&data.final_states);
1260 }
1261 
1262 static int return_implies_callbacks(void *_info, int argc, char **argv, char **azColName)
1263 {
1264 	struct implies_info *info = _info;
1265 	struct db_implies_callback *cb;
1266 	struct expression *arg = NULL;
1267 	int type;
1268 	int param;
1269 
1270 	if (argc != 5)
1271 		return 0;
1272 
1273 	type = atoi(argv[1]);
1274 	param = atoi(argv[2]);
1275 
1276 	FOR_EACH_PTR(info->cb_list, cb) {
1277 		if (cb->type != type)
1278 			continue;
1279 		if (param != -1) {
1280 			arg = get_argument_from_call_expr(info->expr->args, param);
1281 			if (!arg)
1282 				continue;
1283 		}
1284 		cb->callback(info->expr, arg, argv[3], argv[4]);
1285 	} END_FOR_EACH_PTR(cb);
1286 
1287 	return 0;
1288 }
1289 
1290 static int call_implies_callbacks(void *_info, int argc, char **argv, char **azColName)
1291 {
1292 	struct implies_info *info = _info;
1293 	struct db_implies_callback *cb;
1294 	struct expression *arg;
1295 	struct symbol *sym;
1296 	char *name;
1297 	int type;
1298 	int param;
1299 
1300 	if (argc != 5)
1301 		return 0;
1302 
1303 	type = atoi(argv[1]);
1304 	param = atoi(argv[2]);
1305 
1306 	if (!get_param(param, &name, &sym))
1307 		return 0;
1308 	arg = symbol_expression(sym);
1309 	if (!arg)
1310 		return 0;
1311 
1312 	FOR_EACH_PTR(info->cb_list, cb) {
1313 		if (cb->type != type)
1314 			continue;
1315 		cb->callback(info->expr, arg, argv[3], argv[4]);
1316 	} END_FOR_EACH_PTR(cb);
1317 
1318 	return 0;
1319 }
1320 
1321 static void match_return_implies(struct expression *expr)
1322 {
1323 	struct implies_info info = {
1324 		.type = RETURN_IMPLIES,
1325 		.cb_list = return_implies_cb_list,
1326 	};
1327 
1328 	if (expr->fn->type != EXPR_SYMBOL ||
1329 	    !expr->fn->symbol)
1330 		return;
1331 	info.expr = expr;
1332 	info.sym = expr->fn->symbol;
1333 	sql_select_implies("function, type, parameter, key, value", &info,
1334 			   return_implies_callbacks);
1335 }
1336 
1337 static void match_call_implies(struct symbol *sym)
1338 {
1339 	struct implies_info info = {
1340 		.type = CALL_IMPLIES,
1341 		.cb_list = call_implies_cb_list,
1342 	};
1343 
1344 	if (!sym || !sym->ident)
1345 		return;
1346 
1347 	info.sym = sym;
1348 	sql_select_implies("function, type, parameter, key, value", &info,
1349 			   call_implies_callbacks);
1350 }
1351 
1352 static char *get_fn_param_str(struct expression *expr)
1353 {
1354 	struct expression *tmp;
1355 	int param;
1356 	char buf[32];
1357 
1358 	tmp = get_assigned_expr(expr);
1359 	if (tmp)
1360 		expr = tmp;
1361 	expr = strip_expr(expr);
1362 	if (!expr || expr->type != EXPR_CALL)
1363 		return NULL;
1364 	expr = strip_expr(expr->fn);
1365 	if (!expr || expr->type != EXPR_SYMBOL)
1366 		return NULL;
1367 	param = get_param_num(expr);
1368 	if (param < 0)
1369 		return NULL;
1370 
1371 	snprintf(buf, sizeof(buf), "[r $%d]", param);
1372 	return alloc_sname(buf);
1373 }
1374 
1375 static char *get_return_compare_is_param(struct expression *expr)
1376 {
1377 	char *var;
1378 	char buf[256];
1379 	int comparison;
1380 	int param;
1381 
1382 	param = get_param_num(expr);
1383 	if (param < 0)
1384 		return NULL;
1385 
1386 	var = expr_to_var(expr);
1387 	if (!var)
1388 		return NULL;
1389 	snprintf(buf, sizeof(buf), "%s orig", var);
1390 	comparison = get_comparison_strings(var, buf);
1391 	free_string(var);
1392 
1393 	if (!comparison)
1394 		return NULL;
1395 
1396 	snprintf(buf, sizeof(buf), "[%s$%d]", show_special(comparison), param);
1397 	return alloc_sname(buf);
1398 }
1399 
1400 static char *get_return_compare_str(struct expression *expr)
1401 {
1402 	char *compare_str;
1403 
1404 	compare_str = get_return_compare_is_param(expr);
1405 	if (compare_str)
1406 		return compare_str;
1407 
1408 	compare_str = expr_lte_to_param(expr, -1);
1409 	if (compare_str)
1410 		return compare_str;
1411 
1412 	return expr_param_comparison(expr, -1);
1413 }
1414 
1415 static const char *get_return_ranges_str(struct expression *expr, struct range_list **rl_p)
1416 {
1417 	struct range_list *rl;
1418 	char *return_ranges;
1419 	sval_t sval;
1420 	char *fn_param_str;
1421 	char *compare_str;
1422 	char *math_str;
1423 	char buf[128];
1424 
1425 	*rl_p = NULL;
1426 
1427 	if (!expr)
1428 		return alloc_sname("");
1429 
1430 	if (get_implied_value(expr, &sval)) {
1431 		sval = sval_cast(cur_func_return_type(), sval);
1432 		*rl_p = alloc_rl(sval, sval);
1433 		return sval_to_str_or_err_ptr(sval);
1434 	}
1435 
1436 	fn_param_str = get_fn_param_str(expr);
1437 	compare_str = expr_equal_to_param(expr, -1);
1438 	math_str = get_value_in_terms_of_parameter_math(expr);
1439 
1440 	if (get_implied_rl(expr, &rl) && !is_whole_rl(rl)) {
1441 		rl = cast_rl(cur_func_return_type(), rl);
1442 		return_ranges = show_rl(rl);
1443 	} else if (get_imaginary_absolute(expr, &rl)){
1444 		rl = cast_rl(cur_func_return_type(), rl);
1445 		return alloc_sname(show_rl(rl));
1446 	} else {
1447 		get_absolute_rl(expr, &rl);
1448 		rl = cast_rl(cur_func_return_type(), rl);
1449 		return_ranges = show_rl(rl);
1450 	}
1451 	*rl_p = rl;
1452 
1453 	if (fn_param_str) {
1454 		snprintf(buf, sizeof(buf), "%s%s", return_ranges, fn_param_str);
1455 		return alloc_sname(buf);
1456 	}
1457 	if (compare_str) {
1458 		snprintf(buf, sizeof(buf), "%s%s", return_ranges, compare_str);
1459 		return alloc_sname(buf);
1460 	}
1461 	if (math_str) {
1462 		snprintf(buf, sizeof(buf), "%s[%s]", return_ranges, math_str);
1463 		return alloc_sname(buf);
1464 	}
1465 	compare_str = get_return_compare_str(expr);
1466 	if (compare_str) {
1467 		snprintf(buf, sizeof(buf), "%s%s", return_ranges, compare_str);
1468 		return alloc_sname(buf);
1469 	}
1470 
1471 	return return_ranges;
1472 }
1473 
1474 static void match_return_info(int return_id, char *return_ranges, struct expression *expr)
1475 {
1476 	sql_insert_return_states(return_id, return_ranges, INTERNAL, -1, "", function_signature());
1477 }
1478 
1479 static bool call_return_state_hooks_conditional(struct expression *expr)
1480 {
1481 	int final_pass_orig = final_pass;
1482 	static int recurse;
1483 
1484 	if (recurse >= 2)
1485 		return false;
1486 	if (!expr ||
1487 	    (expr->type != EXPR_CONDITIONAL && expr->type != EXPR_SELECT))
1488 		return false;
1489 
1490 	recurse++;
1491 
1492 	__push_fake_cur_stree();
1493 
1494 	final_pass = 0;
1495 	__split_whole_condition(expr->conditional);
1496 	final_pass = final_pass_orig;
1497 
1498 	call_return_state_hooks(expr->cond_true ?: expr->conditional);
1499 
1500 	__push_true_states();
1501 	__use_false_states();
1502 
1503 	call_return_state_hooks(expr->cond_false);
1504 
1505 	__merge_true_states();
1506 	__free_fake_cur_stree();
1507 
1508 	recurse--;
1509 	return true;
1510 }
1511 
1512 static void call_return_state_hooks_compare(struct expression *expr)
1513 {
1514 	struct returned_state_callback *cb;
1515 	char *return_ranges;
1516 	int final_pass_orig = final_pass;
1517 	sval_t sval = { .type = &int_ctype };
1518 	sval_t ret;
1519 
1520 	if (!get_implied_value(expr, &ret))
1521 		ret.value = -1;
1522 
1523 	__push_fake_cur_stree();
1524 
1525 	final_pass = 0;
1526 	__split_whole_condition(expr);
1527 	final_pass = final_pass_orig;
1528 
1529 	if (ret.value != 0) {
1530 		return_ranges = alloc_sname("1");
1531 		sval.value = 1;
1532 		set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_sval(sval));
1533 
1534 		return_id++;
1535 		FOR_EACH_PTR(returned_state_callbacks, cb) {
1536 			cb->callback(return_id, return_ranges, expr);
1537 		} END_FOR_EACH_PTR(cb);
1538 	}
1539 
1540 	__push_true_states();
1541 	__use_false_states();
1542 
1543 	if (ret.value != 1) {
1544 		return_ranges = alloc_sname("0");
1545 		sval.value = 0;
1546 		set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_sval(sval));
1547 
1548 		return_id++;
1549 		FOR_EACH_PTR(returned_state_callbacks, cb) {
1550 			cb->callback(return_id, return_ranges, expr);
1551 		} END_FOR_EACH_PTR(cb);
1552 	}
1553 
1554 	__merge_true_states();
1555 	__free_fake_cur_stree();
1556 }
1557 
1558 static int ptr_in_list(struct sm_state *sm, struct state_list *slist)
1559 {
1560 	struct sm_state *tmp;
1561 
1562 	FOR_EACH_PTR(slist, tmp) {
1563 		if (strcmp(tmp->state->name, sm->state->name) == 0)
1564 			return 1;
1565 	} END_FOR_EACH_PTR(tmp);
1566 
1567 	return 0;
1568 }
1569 
1570 static int split_possible_helper(struct sm_state *sm, struct expression *expr)
1571 {
1572 	struct returned_state_callback *cb;
1573 	struct range_list *rl;
1574 	char *return_ranges;
1575 	struct sm_state *tmp;
1576 	int ret = 0;
1577 	int nr_possible, nr_states;
1578 	char *compare_str;
1579 	char buf[128];
1580 	struct state_list *already_handled = NULL;
1581 	sval_t sval;
1582 
1583 	if (!sm || !sm->merged)
1584 		return 0;
1585 
1586 	if (too_many_possible(sm))
1587 		return 0;
1588 
1589 	/* bail if it gets too complicated */
1590 	nr_possible = 0;
1591 	FOR_EACH_PTR(sm->possible, tmp) {
1592 		if (tmp->merged)
1593 			continue;
1594 		if (ptr_in_list(tmp, already_handled))
1595 			continue;
1596 		add_ptr_list(&already_handled, tmp);
1597 		nr_possible++;
1598 	} END_FOR_EACH_PTR(tmp);
1599 	free_slist(&already_handled);
1600 	nr_states = get_db_state_count();
1601 	if (nr_states * nr_possible >= 2000)
1602 		return 0;
1603 
1604 	FOR_EACH_PTR(sm->possible, tmp) {
1605 		if (tmp->merged)
1606 			continue;
1607 		if (ptr_in_list(tmp, already_handled))
1608 			continue;
1609 		add_ptr_list(&already_handled, tmp);
1610 
1611 		ret = 1;
1612 		__push_fake_cur_stree();
1613 
1614 		overwrite_states_using_pool(sm, tmp);
1615 
1616 		rl = cast_rl(cur_func_return_type(), estate_rl(tmp->state));
1617 		return_ranges = show_rl(rl);
1618 		set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(clone_rl(rl)));
1619 		if (!rl_to_sval(rl, &sval)) {
1620 			compare_str = get_return_compare_str(expr);
1621 			if (compare_str) {
1622 				snprintf(buf, sizeof(buf), "%s%s", return_ranges, compare_str);
1623 				return_ranges = alloc_sname(buf);
1624 			}
1625 		}
1626 
1627 		return_id++;
1628 		FOR_EACH_PTR(returned_state_callbacks, cb) {
1629 			cb->callback(return_id, return_ranges, expr);
1630 		} END_FOR_EACH_PTR(cb);
1631 
1632 		__free_fake_cur_stree();
1633 	} END_FOR_EACH_PTR(tmp);
1634 
1635 	free_slist(&already_handled);
1636 
1637 	return ret;
1638 }
1639 
1640 static int call_return_state_hooks_split_possible(struct expression *expr)
1641 {
1642 	struct sm_state *sm;
1643 
1644 	if (!expr || expr_equal_to_param(expr, -1))
1645 		return 0;
1646 
1647 	sm = get_sm_state_expr(SMATCH_EXTRA, expr);
1648 	return split_possible_helper(sm, expr);
1649 }
1650 
1651 static bool has_possible_negative(struct sm_state *sm)
1652 {
1653 	struct sm_state *tmp;
1654 
1655 	if (!type_signed(estate_type(sm->state)))
1656 		return false;
1657 
1658 	FOR_EACH_PTR(sm->possible, tmp) {
1659 		if (!estate_rl(tmp->state))
1660 			continue;
1661 		if (sval_is_negative(estate_min(tmp->state)) &&
1662 		    sval_is_negative(estate_max(tmp->state)))
1663 			return true;
1664 	} END_FOR_EACH_PTR(tmp);
1665 
1666 	return false;
1667 }
1668 
1669 static bool has_separate_zero_null(struct sm_state *sm)
1670 {
1671 	struct sm_state *tmp;
1672 	sval_t sval;
1673 
1674 	FOR_EACH_PTR(sm->possible, tmp) {
1675 		if (!estate_get_single_value(tmp->state, &sval))
1676 			continue;
1677 		if (sval.value == 0)
1678 			return true;
1679 	} END_FOR_EACH_PTR(tmp);
1680 
1681 	return false;
1682 }
1683 
1684 static int split_positive_from_negative(struct expression *expr)
1685 {
1686 	struct sm_state *sm;
1687 	struct returned_state_callback *cb;
1688 	struct range_list *rl;
1689 	const char *return_ranges;
1690 	struct range_list *ret_rl;
1691 	bool separate_zero;
1692 	int undo;
1693 
1694 	/* We're going to print the states 3 times */
1695 	if (get_db_state_count() > 10000 / 3)
1696 		return 0;
1697 
1698 	if (!get_implied_rl(expr, &rl) || !rl)
1699 		return 0;
1700 	/* Forget about INT_MAX and larger */
1701 	if (rl_max(rl).value <= 0)
1702 		return 0;
1703 	if (!sval_is_negative(rl_min(rl)))
1704 		return 0;
1705 
1706 	sm = get_sm_state_expr(SMATCH_EXTRA, expr);
1707 	if (!sm)
1708 		return 0;
1709 	if (!has_possible_negative(sm))
1710 		return 0;
1711 	separate_zero = has_separate_zero_null(sm);
1712 
1713 	if (!assume(compare_expression(expr, separate_zero ? '>' : SPECIAL_GTE, zero_expr())))
1714 		return 0;
1715 
1716 	return_id++;
1717 	return_ranges = get_return_ranges_str(expr, &ret_rl);
1718 	set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));
1719 	FOR_EACH_PTR(returned_state_callbacks, cb) {
1720 		cb->callback(return_id, (char *)return_ranges, expr);
1721 	} END_FOR_EACH_PTR(cb);
1722 
1723 	end_assume();
1724 
1725 	if (separate_zero) {
1726 		undo = assume(compare_expression(expr, SPECIAL_EQUAL, zero_expr()));
1727 
1728 		return_id++;
1729 		return_ranges = get_return_ranges_str(expr, &ret_rl);
1730 		set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));
1731 		FOR_EACH_PTR(returned_state_callbacks, cb) {
1732 			cb->callback(return_id, (char *)return_ranges, expr);
1733 		} END_FOR_EACH_PTR(cb);
1734 
1735 		if (undo)
1736 			end_assume();
1737 	}
1738 
1739 	undo = assume(compare_expression(expr, '<', zero_expr()));
1740 
1741 	return_id++;
1742 	return_ranges = get_return_ranges_str(expr, &ret_rl);
1743 	set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));
1744 	FOR_EACH_PTR(returned_state_callbacks, cb) {
1745 		cb->callback(return_id, (char *)return_ranges, expr);
1746 	} END_FOR_EACH_PTR(cb);
1747 
1748 	if (undo)
1749 		end_assume();
1750 
1751 	return 1;
1752 }
1753 
1754 static int call_return_state_hooks_split_null_non_null_zero(struct expression *expr)
1755 {
1756 	struct returned_state_callback *cb;
1757 	struct range_list *rl;
1758 	struct range_list *nonnull_rl;
1759 	sval_t null_sval;
1760 	struct range_list *null_rl = NULL;
1761 	char *return_ranges;
1762 	struct sm_state *sm;
1763 	struct smatch_state *state;
1764 	int nr_states;
1765 	int final_pass_orig = final_pass;
1766 
1767 	if (!expr || expr_equal_to_param(expr, -1))
1768 		return 0;
1769 	if (expr->type == EXPR_CALL)
1770 		return 0;
1771 
1772 	sm = get_sm_state_expr(SMATCH_EXTRA, expr);
1773 	if (!sm)
1774 		return 0;
1775 	if (ptr_list_size((struct ptr_list *)sm->possible) == 1)
1776 		return 0;
1777 	state = sm->state;
1778 	if (!estate_rl(state))
1779 		return 0;
1780 	if (estate_min(state).value == 0 && estate_max(state).value == 0)
1781 		return 0;
1782 	if (!has_separate_zero_null(sm))
1783 		return 0;
1784 
1785 	nr_states = get_db_state_count();
1786 	if (option_info && nr_states >= 1500)
1787 		return 0;
1788 
1789 	rl = estate_rl(state);
1790 
1791 	__push_fake_cur_stree();
1792 
1793 	final_pass = 0;
1794 	__split_whole_condition(expr);
1795 	final_pass = final_pass_orig;
1796 
1797 	nonnull_rl = rl_filter(rl, rl_zero());
1798 	return_ranges = show_rl(nonnull_rl);
1799 	set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(nonnull_rl));
1800 
1801 	return_id++;
1802 	FOR_EACH_PTR(returned_state_callbacks, cb) {
1803 		cb->callback(return_id, return_ranges, expr);
1804 	} END_FOR_EACH_PTR(cb);
1805 
1806 	__push_true_states();
1807 	__use_false_states();
1808 
1809 	return_ranges = alloc_sname("0");
1810 	null_sval = sval_type_val(rl_type(rl), 0);
1811 	add_range(&null_rl, null_sval, null_sval);
1812 	set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(null_rl));
1813 	return_id++;
1814 	FOR_EACH_PTR(returned_state_callbacks, cb) {
1815 		cb->callback(return_id, return_ranges, expr);
1816 	} END_FOR_EACH_PTR(cb);
1817 
1818 	__merge_true_states();
1819 	__free_fake_cur_stree();
1820 
1821 	return 1;
1822 }
1823 
1824 static bool is_kernel_success_fail(struct sm_state *sm)
1825 {
1826 	struct sm_state *tmp;
1827 	struct range_list *rl;
1828 	bool has_zero = false;
1829 	bool has_neg = false;
1830 
1831 	if (!type_signed(estate_type(sm->state)))
1832 		return false;
1833 
1834 	FOR_EACH_PTR(sm->possible, tmp) {
1835 		rl = estate_rl(tmp->state);
1836 		if (!rl)
1837 			return false;
1838 		if (rl_min(rl).value == 0 && rl_max(rl).value == 0) {
1839 			has_zero = true;
1840 			continue;
1841 		}
1842 		has_neg = true;
1843 		if (rl_min(rl).value >= -4095 && rl_max(rl).value < 0)
1844 			continue;
1845 		if (strcmp(tmp->state->name, "s32min-(-1)") == 0)
1846 			continue;
1847 		if (strcmp(tmp->state->name, "s32min-(-1),1-s32max") == 0)
1848 			continue;
1849 		return false;
1850 	} END_FOR_EACH_PTR(tmp);
1851 
1852 	return has_zero && has_neg;
1853 }
1854 
1855 static int call_return_state_hooks_split_success_fail(struct expression *expr)
1856 {
1857 	struct sm_state *sm;
1858 	struct range_list *rl;
1859 	struct range_list *nonzero_rl;
1860 	sval_t zero_sval;
1861 	struct range_list *zero_rl = NULL;
1862 	int nr_states;
1863 	struct returned_state_callback *cb;
1864 	char *return_ranges;
1865 	int final_pass_orig = final_pass;
1866 
1867 	if (option_project != PROJ_KERNEL)
1868 		return 0;
1869 
1870 	nr_states = get_db_state_count();
1871 	if (nr_states > 2000)
1872 		return 0;
1873 
1874 	sm = get_sm_state_expr(SMATCH_EXTRA, expr);
1875 	if (!sm)
1876 		return 0;
1877 	if (ptr_list_size((struct ptr_list *)sm->possible) == 1)
1878 		return 0;
1879 	if (!is_kernel_success_fail(sm))
1880 		return 0;
1881 
1882 	rl = estate_rl(sm->state);
1883 	if (!rl)
1884 		return 0;
1885 
1886 	__push_fake_cur_stree();
1887 
1888 	final_pass = 0;
1889 	__split_whole_condition(expr);
1890 	final_pass = final_pass_orig;
1891 
1892 	nonzero_rl = rl_filter(rl, rl_zero());
1893 	nonzero_rl = cast_rl(cur_func_return_type(), nonzero_rl);
1894 	return_ranges = show_rl(nonzero_rl);
1895 	set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(nonzero_rl));
1896 
1897 	return_id++;
1898 	FOR_EACH_PTR(returned_state_callbacks, cb) {
1899 		cb->callback(return_id, return_ranges, expr);
1900 	} END_FOR_EACH_PTR(cb);
1901 
1902 	__push_true_states();
1903 	__use_false_states();
1904 
1905 	return_ranges = alloc_sname("0");
1906 	zero_sval = sval_type_val(rl_type(rl), 0);
1907 	add_range(&zero_rl, zero_sval, zero_sval);
1908 	set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(zero_rl));
1909 	return_id++;
1910 	FOR_EACH_PTR(returned_state_callbacks, cb) {
1911 		cb->callback(return_id, return_ranges, expr);
1912 	} END_FOR_EACH_PTR(cb);
1913 
1914 	__merge_true_states();
1915 	__free_fake_cur_stree();
1916 
1917 	return 1;
1918 }
1919 
1920 static int is_boolean(struct expression *expr)
1921 {
1922 	struct range_list *rl;
1923 
1924 	if (!get_implied_rl(expr, &rl))
1925 		return 0;
1926 	if (rl_min(rl).value == 0 && rl_max(rl).value == 1)
1927 		return 1;
1928 	return 0;
1929 }
1930 
1931 static int splitable_function_call(struct expression *expr)
1932 {
1933 	struct sm_state *sm;
1934 	char buf[64];
1935 
1936 	if (!expr || expr->type != EXPR_CALL)
1937 		return 0;
1938 	snprintf(buf, sizeof(buf), "return %p", expr);
1939 	sm = get_sm_state(SMATCH_EXTRA, buf, NULL);
1940 	return split_possible_helper(sm, expr);
1941 }
1942 
1943 static struct sm_state *find_bool_param(void)
1944 {
1945 	struct stree *start_states;
1946 	struct symbol *arg;
1947 	struct sm_state *sm, *tmp;
1948 	sval_t sval;
1949 
1950 	start_states = get_start_states();
1951 
1952 	FOR_EACH_PTR_REVERSE(cur_func_sym->ctype.base_type->arguments, arg) {
1953 		if (!arg->ident)
1954 			continue;
1955 		sm = get_sm_state_stree(start_states, SMATCH_EXTRA, arg->ident->name, arg);
1956 		if (!sm)
1957 			continue;
1958 		if (rl_min(estate_rl(sm->state)).value != 0 ||
1959 		    rl_max(estate_rl(sm->state)).value != 1)
1960 			continue;
1961 		goto found;
1962 	} END_FOR_EACH_PTR_REVERSE(arg);
1963 
1964 	return NULL;
1965 
1966 found:
1967 	/*
1968 	 * Check if it's splitable.  If not, then splitting it up is likely not
1969 	 * useful for the callers.
1970 	 */
1971 	FOR_EACH_PTR(sm->possible, tmp) {
1972 		if (is_merged(tmp))
1973 			continue;
1974 		if (!estate_get_single_value(tmp->state, &sval))
1975 			return NULL;
1976 	} END_FOR_EACH_PTR(tmp);
1977 
1978 	return sm;
1979 }
1980 
1981 static int split_on_bool_sm(struct sm_state *sm, struct expression *expr)
1982 {
1983 	struct returned_state_callback *cb;
1984 	struct range_list *ret_rl;
1985 	const char *return_ranges;
1986 	struct sm_state *tmp;
1987 	int ret = 0;
1988 	struct state_list *already_handled = NULL;
1989 
1990 	if (!sm || !sm->merged)
1991 		return 0;
1992 
1993 	if (too_many_possible(sm))
1994 		return 0;
1995 
1996 	FOR_EACH_PTR(sm->possible, tmp) {
1997 		if (tmp->merged)
1998 			continue;
1999 		if (ptr_in_list(tmp, already_handled))
2000 			continue;
2001 		add_ptr_list(&already_handled, tmp);
2002 
2003 		ret = 1;
2004 		__push_fake_cur_stree();
2005 
2006 		overwrite_states_using_pool(sm, tmp);
2007 
2008 		return_ranges = get_return_ranges_str(expr, &ret_rl);
2009 		set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));
2010 		return_id++;
2011 		FOR_EACH_PTR(returned_state_callbacks, cb) {
2012 			cb->callback(return_id, (char *)return_ranges, expr);
2013 		} END_FOR_EACH_PTR(cb);
2014 
2015 		__free_fake_cur_stree();
2016 	} END_FOR_EACH_PTR(tmp);
2017 
2018 	free_slist(&already_handled);
2019 
2020 	return ret;
2021 }
2022 
2023 static int split_by_bool_param(struct expression *expr)
2024 {
2025 	struct sm_state *start_sm, *sm;
2026 	sval_t sval;
2027 
2028 	start_sm = find_bool_param();
2029 	if (!start_sm)
2030 		return 0;
2031 	sm = get_sm_state(SMATCH_EXTRA, start_sm->name, start_sm->sym);
2032 	if (!sm || estate_get_single_value(sm->state, &sval))
2033 		return 0;
2034 
2035 	if (get_db_state_count() * 2 >= 2000)
2036 		return 0;
2037 
2038 	return split_on_bool_sm(sm, expr);
2039 }
2040 
2041 static int split_by_null_nonnull_param(struct expression *expr)
2042 {
2043 	struct symbol *arg;
2044 	struct sm_state *sm;
2045 	int nr_possible;
2046 
2047 	/* function must only take one pointer */
2048 	if (ptr_list_size((struct ptr_list *)cur_func_sym->ctype.base_type->arguments) != 1)
2049 		return 0;
2050 	arg = first_ptr_list((struct ptr_list *)cur_func_sym->ctype.base_type->arguments);
2051 	if (!arg->ident)
2052 		return 0;
2053 	if (get_real_base_type(arg)->type != SYM_PTR)
2054 		return 0;
2055 
2056 	if (param_was_set_var_sym(arg->ident->name, arg))
2057 		return 0;
2058 	sm = get_sm_state(SMATCH_EXTRA, arg->ident->name, arg);
2059 	if (!sm)
2060 		return 0;
2061 
2062 	if (!has_separate_zero_null(sm))
2063 		return 0;
2064 
2065 	nr_possible = ptr_list_size((struct ptr_list *)sm->possible);
2066 	if (get_db_state_count() * nr_possible >= 2000)
2067 		return 0;
2068 
2069 	return split_on_bool_sm(sm, expr);
2070 }
2071 
2072 struct expression *strip_expr_statement(struct expression *expr)
2073 {
2074 	struct expression *orig = expr;
2075 	struct statement *stmt, *last_stmt;
2076 
2077 	if (!expr)
2078 		return NULL;
2079 	if (expr->type == EXPR_PREOP && expr->op == '(')
2080 		expr = expr->unop;
2081 	if (expr->type != EXPR_STATEMENT)
2082 		return orig;
2083 	stmt = expr->statement;
2084 	if (!stmt || stmt->type != STMT_COMPOUND)
2085 		return orig;
2086 
2087 	last_stmt = last_ptr_list((struct ptr_list *)stmt->stmts);
2088 	if (!last_stmt || last_stmt->type == STMT_LABEL)
2089 		last_stmt = last_stmt->label_statement;
2090 	if (!last_stmt || last_stmt->type != STMT_EXPRESSION)
2091 		return orig;
2092 	return strip_expr(last_stmt->expression);
2093 }
2094 
2095 static void call_return_state_hooks(struct expression *expr)
2096 {
2097 	struct returned_state_callback *cb;
2098 	struct range_list *ret_rl;
2099 	const char *return_ranges;
2100 	int nr_states;
2101 	sval_t sval;
2102 
2103 	if (__path_is_null())
2104 		return;
2105 
2106 	expr = strip_expr(expr);
2107 	expr = strip_expr_statement(expr);
2108 
2109 	if (is_impossible_path())
2110 		goto vanilla;
2111 
2112 	if (expr && (expr->type == EXPR_COMPARE ||
2113 		     !get_implied_value(expr, &sval)) &&
2114 	    (is_condition(expr) || is_boolean(expr))) {
2115 		call_return_state_hooks_compare(expr);
2116 		return;
2117 	} else if (call_return_state_hooks_conditional(expr)) {
2118 		return;
2119 	} else if (call_return_state_hooks_split_possible(expr)) {
2120 		return;
2121 	} else if (split_positive_from_negative(expr)) {
2122 		return;
2123 	} else if (call_return_state_hooks_split_null_non_null_zero(expr)) {
2124 		return;
2125 	} else if (call_return_state_hooks_split_success_fail(expr)) {
2126 		return;
2127 	} else if (splitable_function_call(expr)) {
2128 		return;
2129 	} else if (split_by_bool_param(expr)) {
2130 	} else if (split_by_null_nonnull_param(expr)) {
2131 		return;
2132 	}
2133 
2134 vanilla:
2135 	return_ranges = get_return_ranges_str(expr, &ret_rl);
2136 	set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));
2137 
2138 	return_id++;
2139 	nr_states = get_db_state_count();
2140 	if (nr_states >= 10000) {
2141 		match_return_info(return_id, (char *)return_ranges, expr);
2142 		print_limited_param_set(return_id, (char *)return_ranges, expr);
2143 		mark_all_params_untracked(return_id, (char *)return_ranges, expr);
2144 		return;
2145 	}
2146 	FOR_EACH_PTR(returned_state_callbacks, cb) {
2147 		cb->callback(return_id, (char *)return_ranges, expr);
2148 	} END_FOR_EACH_PTR(cb);
2149 }
2150 
2151 static void print_returned_struct_members(int return_id, char *return_ranges, struct expression *expr)
2152 {
2153 	struct returned_member_callback *cb;
2154 	struct stree *stree;
2155 	struct sm_state *sm;
2156 	struct symbol *type;
2157 	char *name;
2158 	char member_name[256];
2159 	int len;
2160 
2161 	type = get_type(expr);
2162 	if (!type || type->type != SYM_PTR)
2163 		return;
2164 	name = expr_to_var(expr);
2165 	if (!name)
2166 		return;
2167 
2168 	member_name[sizeof(member_name) - 1] = '\0';
2169 	strcpy(member_name, "$");
2170 
2171 	len = strlen(name);
2172 	FOR_EACH_PTR(returned_member_callbacks, cb) {
2173 		stree = __get_cur_stree();
2174 		FOR_EACH_MY_SM(cb->owner, stree, sm) {
2175 			if (sm->name[0] == '*' && strcmp(sm->name + 1, name) == 0) {
2176 				strcpy(member_name, "*$");
2177 				cb->callback(return_id, return_ranges, expr, member_name, sm->state);
2178 				continue;
2179 			}
2180 			if (strncmp(sm->name, name, len) != 0)
2181 				continue;
2182 			if (strncmp(sm->name + len, "->", 2) != 0)
2183 				continue;
2184 			snprintf(member_name, sizeof(member_name), "$%s", sm->name + len);
2185 			cb->callback(return_id, return_ranges, expr, member_name, sm->state);
2186 		} END_FOR_EACH_SM(sm);
2187 	} END_FOR_EACH_PTR(cb);
2188 
2189 	free_string(name);
2190 }
2191 
2192 static void reset_memdb(struct symbol *sym)
2193 {
2194 	mem_sql(NULL, NULL, "delete from caller_info;");
2195 	mem_sql(NULL, NULL, "delete from return_states;");
2196 	mem_sql(NULL, NULL, "delete from call_implies;");
2197 	mem_sql(NULL, NULL, "delete from return_implies;");
2198 }
2199 
2200 static void match_end_func_info(struct symbol *sym)
2201 {
2202 	if (__path_is_null())
2203 		return;
2204 	call_return_state_hooks(NULL);
2205 }
2206 
2207 static void match_after_func(struct symbol *sym)
2208 {
2209 	if (!__inline_fn)
2210 		reset_memdb(sym);
2211 }
2212 
2213 static void init_memdb(void)
2214 {
2215 	char *err = NULL;
2216 	int rc;
2217 	const char *schema_files[] = {
2218 		"db/db.schema",
2219 		"db/caller_info.schema",
2220 		"db/common_caller_info.schema",
2221 		"db/return_states.schema",
2222 		"db/function_type_size.schema",
2223 		"db/type_size.schema",
2224 		"db/function_type_info.schema",
2225 		"db/type_info.schema",
2226 		"db/call_implies.schema",
2227 		"db/return_implies.schema",
2228 		"db/function_ptr.schema",
2229 		"db/local_values.schema",
2230 		"db/function_type_value.schema",
2231 		"db/type_value.schema",
2232 		"db/function_type.schema",
2233 		"db/data_info.schema",
2234 		"db/parameter_name.schema",
2235 		"db/constraints.schema",
2236 		"db/constraints_required.schema",
2237 		"db/fn_ptr_data_link.schema",
2238 		"db/fn_data_link.schema",
2239 		"db/mtag_about.schema",
2240 		"db/mtag_map.schema",
2241 		"db/mtag_data.schema",
2242 		"db/mtag_alias.schema",
2243 	};
2244 	static char buf[4096];
2245 	int fd;
2246 	int ret;
2247 	int i;
2248 
2249 	rc = sqlite3_open(":memory:", &mem_db);
2250 	if (rc != SQLITE_OK) {
2251 		sm_ierror("starting In-Memory database.");
2252 		return;
2253 	}
2254 
2255 	for (i = 0; i < ARRAY_SIZE(schema_files); i++) {
2256 		fd = open_schema_file(schema_files[i]);
2257 		if (fd < 0)
2258 			continue;
2259 		ret = read(fd, buf, sizeof(buf));
2260 		if (ret < 0) {
2261 			sm_ierror("failed to read: %s", schema_files[i]);
2262 			continue;
2263 		}
2264 		close(fd);
2265 		if (ret == sizeof(buf)) {
2266 			sm_ierror("Schema file too large:  %s (limit %zd bytes)",
2267 			       schema_files[i], sizeof(buf));
2268 			continue;
2269 		}
2270 		buf[ret] = '\0';
2271 		rc = sqlite3_exec(mem_db, buf, NULL, NULL, &err);
2272 		if (rc != SQLITE_OK) {
2273 			sm_ierror("SQL error #2: %s", err);
2274 			sm_ierror("%s", buf);
2275 		}
2276 	}
2277 }
2278 
2279 static void init_cachedb(void)
2280 {
2281 	char *err = NULL;
2282 	int rc;
2283 	const char *schema_files[] = {
2284 		"db/call_implies.schema",
2285 		"db/return_implies.schema",
2286 		"db/type_info.schema",
2287 		"db/mtag_data.schema",
2288 		"db/sink_info.schema",
2289 	};
2290 	static char buf[4096];
2291 	int fd;
2292 	int ret;
2293 	int i;
2294 
2295 	rc = sqlite3_open(":memory:", &cache_db);
2296 	if (rc != SQLITE_OK) {
2297 		sm_ierror("starting In-Memory database.");
2298 		return;
2299 	}
2300 
2301 	for (i = 0; i < ARRAY_SIZE(schema_files); i++) {
2302 		fd = open_schema_file(schema_files[i]);
2303 		if (fd < 0)
2304 			continue;
2305 		ret = read(fd, buf, sizeof(buf));
2306 		if (ret < 0) {
2307 			sm_ierror("failed to read: %s", schema_files[i]);
2308 			continue;
2309 		}
2310 		close(fd);
2311 		if (ret == sizeof(buf)) {
2312 			sm_ierror("Schema file too large:  %s (limit %zd bytes)",
2313 			       schema_files[i], sizeof(buf));
2314 			continue;
2315 		}
2316 		buf[ret] = '\0';
2317 		rc = sqlite3_exec(cache_db, buf, NULL, NULL, &err);
2318 		if (rc != SQLITE_OK) {
2319 			sm_ierror("SQL error #2: %s", err);
2320 			sm_ierror("%s", buf);
2321 		}
2322 	}
2323 }
2324 
2325 static int save_cache_data(void *_table, int argc, char **argv, char **azColName)
2326 {
2327 	static char buf[4096];
2328 	char tmp[256];
2329 	char *p = buf;
2330 	char *table = _table;
2331 	int i;
2332 
2333 
2334 	p += snprintf(p, 4096 - (p - buf), "insert or ignore into %s values (", table);
2335 	for (i = 0; i < argc; i++) {
2336 		if (i)
2337 			p += snprintf(p, 4096 - (p - buf), ", ");
2338 		sqlite3_snprintf(sizeof(tmp), tmp, "%q", escape_newlines(argv[i]));
2339 		p += snprintf(p, 4096 - (p - buf), "'%s'", tmp);
2340 
2341 	}
2342 	p += snprintf(p, 4096 - (p - buf), ");");
2343 	if (p - buf > 4096)
2344 		return 0;
2345 
2346 	sm_msg("SQL: %s", buf);
2347 	return 0;
2348 }
2349 
2350 static void dump_cache(struct symbol_list *sym_list)
2351 {
2352 	if (!option_info)
2353 		return;
2354 	cache_sql(&save_cache_data, (char *)"type_info", "select * from type_info;");
2355 	cache_sql(&save_cache_data, (char *)"return_implies", "select * from return_implies;");
2356 	cache_sql(&save_cache_data, (char *)"call_implies", "select * from call_implies;");
2357 	cache_sql(&save_cache_data, (char *)"mtag_data", "select * from mtag_data;");
2358 	cache_sql(&save_cache_data, (char *)"sink_info", "select * from sink_info;");
2359 }
2360 
2361 void open_smatch_db(char *db_file)
2362 {
2363 	int rc;
2364 
2365 	if (option_no_db)
2366 		return;
2367 
2368 	use_states = malloc(num_checks + 1);
2369 	memset(use_states, 0xff, num_checks + 1);
2370 
2371 	init_memdb();
2372 	init_cachedb();
2373 
2374 	rc = sqlite3_open_v2(db_file, &smatch_db, SQLITE_OPEN_READONLY, NULL);
2375 	if (rc != SQLITE_OK) {
2376 		option_no_db = 1;
2377 		return;
2378 	}
2379 	run_sql(NULL, NULL,
2380 		"PRAGMA cache_size = %d;", SQLITE_CACHE_PAGES);
2381 	return;
2382 }
2383 
2384 static void register_common_funcs(void)
2385 {
2386 	struct token *token;
2387 	char *func;
2388 	char filename[256];
2389 
2390 	if (option_project == PROJ_NONE)
2391 		strcpy(filename, "common_functions");
2392 	else
2393 		snprintf(filename, 256, "%s.common_functions", option_project_str);
2394 
2395 	token = get_tokens_file(filename);
2396 	if (!token)
2397 		return;
2398 	if (token_type(token) != TOKEN_STREAMBEGIN)
2399 		return;
2400 	token = token->next;
2401 	while (token_type(token) != TOKEN_STREAMEND) {
2402 		if (token_type(token) != TOKEN_IDENT)
2403 			return;
2404 		func = alloc_string(show_ident(token->ident));
2405 		add_ptr_list(&common_funcs, func);
2406 		token = token->next;
2407 	}
2408 	clear_token_alloc();
2409 }
2410 
2411 static char *get_next_string(char **str)
2412 {
2413 	static char string[256];
2414 	char *start;
2415 	char *p = *str;
2416 	int len, i, j;
2417 
2418 	if (*p == '\0')
2419 		return NULL;
2420 	start = p;
2421 
2422 	while (*p != '\0' && *p != '\n') {
2423 		if (*p == '\\' && *(p + 1) == ' ') {
2424 			p += 2;
2425 			continue;
2426 		}
2427 		if (*p == ' ')
2428 			break;
2429 		p++;
2430 	}
2431 
2432 	len = p - start;
2433 	if (len >= sizeof(string)) {
2434 		memcpy(string, start, sizeof(string));
2435 		string[sizeof(string) - 1] = '\0';
2436 		sm_ierror("return_fix: '%s' too long", string);
2437 		**str = '\0';
2438 		return NULL;
2439 	}
2440 	memcpy(string, start, len);
2441 	string[len] = '\0';
2442 	for (i = 0; i < sizeof(string) - 1; i++) {
2443 		if (string[i] == '\\' && string[i + 1] == ' ') {
2444 			for (j = i; string[j] != '\0'; j++)
2445 				string[j] = string[j + 1];
2446 		}
2447 	}
2448 	if (*p != '\0')
2449 		p++;
2450 	*str = p;
2451 	return string;
2452 }
2453 
2454 static void register_return_replacements(void)
2455 {
2456 	char *func, *orig, *new;
2457 	char filename[256];
2458 	char buf[4096];
2459 	int fd, ret, i;
2460 	char *p;
2461 
2462 	snprintf(filename, 256, "db/%s.return_fixes", option_project_str);
2463 	fd = open_schema_file(filename);
2464 	if (fd < 0)
2465 		return;
2466 	ret = read(fd, buf, sizeof(buf));
2467 	close(fd);
2468 	if (ret < 0)
2469 		return;
2470 	if (ret == sizeof(buf)) {
2471 		sm_ierror("file too large:  %s (limit %zd bytes)",
2472 		       filename, sizeof(buf));
2473 		return;
2474 	}
2475 	buf[ret] = '\0';
2476 
2477 	p = buf;
2478 	while (*p) {
2479 		get_next_string(&p);
2480 		replace_count++;
2481 	}
2482 	if (replace_count == 0 || replace_count % 3 != 0) {
2483 		replace_count = 0;
2484 		return;
2485 	}
2486 	replace_table = malloc(replace_count * sizeof(char *));
2487 
2488 	p = buf;
2489 	i = 0;
2490 	while (*p) {
2491 		func = alloc_string(get_next_string(&p));
2492 		orig = alloc_string(get_next_string(&p));
2493 		new  = alloc_string(get_next_string(&p));
2494 
2495 		replace_table[i++] = func;
2496 		replace_table[i++] = orig;
2497 		replace_table[i++] = new;
2498 	}
2499 }
2500 
2501 void register_definition_db_callbacks(int id)
2502 {
2503 	add_hook(&match_call_info, FUNCTION_CALL_HOOK);
2504 	add_split_return_callback(match_return_info);
2505 	add_split_return_callback(print_returned_struct_members);
2506 	add_hook(&call_return_state_hooks, RETURN_HOOK);
2507 	add_hook(&match_end_func_info, END_FUNC_HOOK);
2508 	add_hook(&match_after_func, AFTER_FUNC_HOOK);
2509 
2510 	add_hook(&match_data_from_db, FUNC_DEF_HOOK);
2511 	add_hook(&match_call_implies, FUNC_DEF_HOOK);
2512 	add_hook(&match_return_implies, CALL_HOOK_AFTER_INLINE);
2513 
2514 	register_common_funcs();
2515 	register_return_replacements();
2516 
2517 	add_hook(&dump_cache, END_FILE_HOOK);
2518 }
2519 
2520 void register_db_call_marker(int id)
2521 {
2522 	add_hook(&match_call_marker, FUNCTION_CALL_HOOK);
2523 }
2524 
2525 char *return_state_to_var_sym(struct expression *expr, int param, const char *key, struct symbol **sym)
2526 {
2527 	struct expression *arg;
2528 	char *name = NULL;
2529 	char member_name[256];
2530 
2531 	*sym = NULL;
2532 
2533 	if (param == -1) {
2534 		const char *star = "";
2535 
2536 		if (expr->type != EXPR_ASSIGNMENT)
2537 			return NULL;
2538 		if (get_type(expr->left) == &int_ctype && strcmp(key, "$") != 0)
2539 			return NULL;
2540 		name = expr_to_var_sym(expr->left, sym);
2541 		if (!name)
2542 			return NULL;
2543 		if (key[0] == '*') {
2544 			star = "*";
2545 			key++;
2546 		}
2547 		if (strncmp(key, "$", 1) != 0)
2548 			return name;
2549 		snprintf(member_name, sizeof(member_name), "%s%s%s", star, name, key + 1);
2550 		free_string(name);
2551 		return alloc_string(member_name);
2552 	}
2553 
2554 	while (expr->type == EXPR_ASSIGNMENT)
2555 		expr = strip_expr(expr->right);
2556 	if (expr->type != EXPR_CALL)
2557 		return NULL;
2558 
2559 	arg = get_argument_from_call_expr(expr->args, param);
2560 	if (!arg)
2561 		return NULL;
2562 
2563 	return get_variable_from_key(arg, key, sym);
2564 }
2565 
2566 char *get_variable_from_key(struct expression *arg, const char *key, struct symbol **sym)
2567 {
2568 	char buf[256];
2569 	char *tmp;
2570 	int star_cnt = 0;
2571 
2572 	if (!arg)
2573 		return NULL;
2574 
2575 	arg = strip_expr(arg);
2576 
2577 	if (strcmp(key, "$") == 0)
2578 		return expr_to_var_sym(arg, sym);
2579 
2580 	if (strcmp(key, "*$") == 0) {
2581 		if (arg->type == EXPR_PREOP && arg->op == '&') {
2582 			arg = strip_expr(arg->unop);
2583 			return expr_to_var_sym(arg, sym);
2584 		} else {
2585 			tmp = expr_to_var_sym(arg, sym);
2586 			if (!tmp)
2587 				return NULL;
2588 			snprintf(buf, sizeof(buf), "*%s", tmp);
2589 			free_string(tmp);
2590 			return alloc_string(buf);
2591 		}
2592 	}
2593 
2594 	while (key[0] == '*') {
2595 		star_cnt++;
2596 		key++;
2597 	}
2598 
2599 	if (arg->type == EXPR_PREOP && arg->op == '&' && star_cnt) {
2600 		arg = strip_expr(arg->unop);
2601 		star_cnt--;
2602 	}
2603 
2604 	if (arg->type == EXPR_PREOP && arg->op == '&') {
2605 		arg = strip_expr(arg->unop);
2606 		tmp = expr_to_var_sym(arg, sym);
2607 		if (!tmp)
2608 			return NULL;
2609 		snprintf(buf, sizeof(buf), "%.*s%s.%s",
2610 			 star_cnt, "**********", tmp, key + 3);
2611 		return alloc_string(buf);
2612 	}
2613 
2614 	tmp = expr_to_var_sym(arg, sym);
2615 	if (!tmp)
2616 		return NULL;
2617 	snprintf(buf, sizeof(buf), "%.*s%s%s", star_cnt, "**********", tmp, key + 1);
2618 	free_string(tmp);
2619 	return alloc_string(buf);
2620 }
2621 
2622 char *get_chunk_from_key(struct expression *arg, char *key, struct symbol **sym, struct var_sym_list **vsl)
2623 {
2624 	*vsl = NULL;
2625 
2626 	if (strcmp("$", key) == 0)
2627 		return expr_to_chunk_sym_vsl(arg, sym, vsl);
2628 	return get_variable_from_key(arg, key, sym);
2629 }
2630 
2631 const char *state_name_to_param_name(const char *state_name, const char *param_name)
2632 {
2633 	int star_cnt = 0;
2634 	int name_len;
2635 	char buf[256];
2636 
2637 	name_len = strlen(param_name);
2638 
2639 	while (state_name[0] == '*') {
2640 		star_cnt++;
2641 		state_name++;
2642 	}
2643 
2644 	/* ten out of ten stars! */
2645 	if (star_cnt > 10)
2646 		return NULL;
2647 
2648 	if (strcmp(state_name, param_name) == 0) {
2649 		snprintf(buf, sizeof(buf), "%.*s$", star_cnt, "**********");
2650 		return alloc_sname(buf);
2651 	}
2652 
2653 	if (state_name[name_len] == '-' && /* check for '-' from "->" */
2654 	    strncmp(state_name, param_name, name_len) == 0) {
2655 		snprintf(buf, sizeof(buf), "%.*s$%s", star_cnt, "**********", state_name + name_len);
2656 		return alloc_sname(buf);
2657 	}
2658 	return NULL;
2659 }
2660 
2661 const char *get_param_name_var_sym(const char *name, struct symbol *sym)
2662 {
2663 	if (!sym || !sym->ident)
2664 		return NULL;
2665 
2666 	return state_name_to_param_name(name, sym->ident->name);
2667 }
2668 
2669 const char *get_mtag_name_var_sym(const char *state_name, struct symbol *sym)
2670 {
2671 	struct symbol *type;
2672 	const char *sym_name;
2673 	int name_len;
2674 	static char buf[256];
2675 
2676 	/*
2677 	 * mtag_name is different from param_name because mtags can be a struct
2678 	 * instead of a struct pointer.  But we want to treat it like a pointer
2679 	 * because really an mtag is a pointer.  Or in other words, if you pass
2680 	 * a struct foo then you want to talk about foo.bar but with an mtag
2681 	 * you want to refer to it as foo->bar.
2682 	 *
2683 	 */
2684 
2685 	if (!sym || !sym->ident)
2686 		return NULL;
2687 
2688 	type = get_real_base_type(sym);
2689 	if (type && type->type == SYM_BASETYPE)
2690 		return "*$";
2691 
2692 	sym_name = sym->ident->name;
2693 	name_len = strlen(sym_name);
2694 
2695 	if (state_name[name_len] == '.' && /* check for '-' from "->" */
2696 	    strncmp(state_name, sym_name, name_len) == 0) {
2697 		snprintf(buf, sizeof(buf), "$->%s", state_name + name_len + 1);
2698 		return buf;
2699 	}
2700 
2701 	return state_name_to_param_name(state_name, sym_name);
2702 }
2703 
2704 const char *get_mtag_name_expr(struct expression *expr)
2705 {
2706 	char *name;
2707 	struct symbol *sym;
2708 	const char *ret = NULL;
2709 
2710 	name = expr_to_var_sym(expr, &sym);
2711 	if (!name || !sym)
2712 		goto free;
2713 
2714 	ret = get_mtag_name_var_sym(name, sym);
2715 free:
2716 	free_string(name);
2717 	return ret;
2718 }
2719 
2720 const char *get_param_name(struct sm_state *sm)
2721 {
2722 	return get_param_name_var_sym(sm->name, sm->sym);
2723 }
2724 
2725 char *get_data_info_name(struct expression *expr)
2726 {
2727 	struct symbol *sym;
2728 	char *name;
2729 	char buf[256];
2730 	char *ret = NULL;
2731 
2732 	expr = strip_expr(expr);
2733 	name = get_member_name(expr);
2734 	if (name)
2735 		return name;
2736 	name = expr_to_var_sym(expr, &sym);
2737 	if (!name || !sym)
2738 		goto free;
2739 	if (!(sym->ctype.modifiers & MOD_TOPLEVEL))
2740 		goto free;
2741 	if (sym->ctype.modifiers & MOD_STATIC)
2742 		snprintf(buf, sizeof(buf), "static %s", name);
2743 	else
2744 		snprintf(buf, sizeof(buf), "global %s", name);
2745 	ret = alloc_sname(buf);
2746 free:
2747 	free_string(name);
2748 	return ret;
2749 }
2750