2 * Copyright (C) 2009 Dan Carpenter.
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.
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.
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
19 * There are several types of function hooks:
20 * add_function_hook() - For any time a function is called.
21 * add_function_assign_hook() - foo = the_function().
22 * add_implied_return_hook() - Calculates the implied return value.
23 * add_macro_assign_hook() - foo = the_macro().
24 * return_implies_state() - For when a return value of 1 implies locked
25 * and 0 implies unlocked. etc. etc.
32 #include "smatch_slist.h"
33 #include "smatch_extra.h"
34 #include "smatch_function_hashtable.h"
38 struct data_range
*range
;
41 implication_hook
*ranged
;
42 implied_return_hook
*implied_return
;
47 ALLOCATOR(fcall_back
, "call backs");
48 DECLARE_PTR_LIST(call_back_list
, struct fcall_back
);
50 DEFINE_FUNCTION_HASHTABLE_STATIC(callback
, struct fcall_back
, struct call_back_list
);
51 static struct hashtable
*func_hash
;
53 #define REGULAR_CALL 0
56 #define IMPLIED_RETURN 3
57 #define MACRO_ASSIGN 4
58 #define MACRO_ASSIGN_EXTRA 5
60 struct return_implies_callback
{
62 return_implies_hook
*callback
;
64 ALLOCATOR(return_implies_callback
, "return_implies callbacks");
65 DECLARE_PTR_LIST(db_implies_list
, struct return_implies_callback
);
66 static struct db_implies_list
*db_return_states_list
;
68 typedef void (void_fn
)(void);
69 DECLARE_PTR_LIST(void_fn_list
, void_fn
*);
70 static struct void_fn_list
*return_states_before
;
71 static struct void_fn_list
*return_states_after
;
73 static struct fcall_back
*alloc_fcall_back(int type
, void *call_back
,
76 struct fcall_back
*cb
;
78 cb
= __alloc_fcall_back(0);
80 cb
->u
.call_back
= call_back
;
85 void add_function_hook(const char *look_for
, func_hook
*call_back
, void *info
)
87 struct fcall_back
*cb
;
89 cb
= alloc_fcall_back(REGULAR_CALL
, call_back
, info
);
90 add_callback(func_hash
, look_for
, cb
);
93 void add_function_assign_hook(const char *look_for
, func_hook
*call_back
,
96 struct fcall_back
*cb
;
98 cb
= alloc_fcall_back(ASSIGN_CALL
, call_back
, info
);
99 add_callback(func_hash
, look_for
, cb
);
102 void add_implied_return_hook(const char *look_for
,
103 implied_return_hook
*call_back
,
106 struct fcall_back
*cb
;
108 cb
= alloc_fcall_back(IMPLIED_RETURN
, call_back
, info
);
109 add_callback(func_hash
, look_for
, cb
);
112 void add_macro_assign_hook(const char *look_for
, func_hook
*call_back
,
115 struct fcall_back
*cb
;
117 cb
= alloc_fcall_back(MACRO_ASSIGN
, call_back
, info
);
118 add_callback(func_hash
, look_for
, cb
);
121 void add_macro_assign_hook_extra(const char *look_for
, func_hook
*call_back
,
124 struct fcall_back
*cb
;
126 cb
= alloc_fcall_back(MACRO_ASSIGN_EXTRA
, call_back
, info
);
127 add_callback(func_hash
, look_for
, cb
);
130 void return_implies_state(const char *look_for
, long long start
, long long end
,
131 implication_hook
*call_back
, void *info
)
133 struct fcall_back
*cb
;
135 cb
= alloc_fcall_back(RANGED_CALL
, call_back
, info
);
136 cb
->range
= alloc_range_perm(ll_to_sval(start
), ll_to_sval(end
));
137 add_callback(func_hash
, look_for
, cb
);
140 void select_return_states_hook(int type
, return_implies_hook
*callback
)
142 struct return_implies_callback
*cb
= __alloc_return_implies_callback(0);
145 cb
->callback
= callback
;
146 add_ptr_list(&db_return_states_list
, cb
);
149 void select_return_states_before(void_fn
*fn
)
151 void_fn
**p
= malloc(sizeof(void_fn
*));
153 add_ptr_list(&return_states_before
, p
);
156 void select_return_states_after(void_fn
*fn
)
158 void_fn
**p
= malloc(sizeof(void_fn
*));
160 add_ptr_list(&return_states_after
, p
);
163 static void call_return_states_before_hooks(void)
167 FOR_EACH_PTR(return_states_before
, fn
) {
169 } END_FOR_EACH_PTR(fn
);
172 static void call_return_states_after_hooks(struct expression
*expr
)
176 FOR_EACH_PTR(return_states_after
, fn
) {
178 } END_FOR_EACH_PTR(fn
);
179 __pass_to_client(expr
, FUNCTION_CALL_HOOK_AFTER_DB
);
182 static int call_call_backs(struct call_back_list
*list
, int type
,
183 const char *fn
, struct expression
*expr
)
185 struct fcall_back
*tmp
;
188 FOR_EACH_PTR(list
, tmp
) {
189 if (tmp
->type
== type
) {
190 (tmp
->u
.call_back
)(fn
, expr
, tmp
->info
);
193 } END_FOR_EACH_PTR(tmp
);
198 static void call_ranged_call_backs(struct call_back_list
*list
,
199 const char *fn
, struct expression
*call_expr
,
200 struct expression
*assign_expr
)
202 struct fcall_back
*tmp
;
204 FOR_EACH_PTR(list
, tmp
) {
205 (tmp
->u
.ranged
)(fn
, call_expr
, assign_expr
, tmp
->info
);
206 } END_FOR_EACH_PTR(tmp
);
209 static struct call_back_list
*get_same_ranged_call_backs(struct call_back_list
*list
,
210 struct data_range
*drange
)
212 struct call_back_list
*ret
= NULL
;
213 struct fcall_back
*tmp
;
215 FOR_EACH_PTR(list
, tmp
) {
216 if (tmp
->type
!= RANGED_CALL
)
218 if (ranges_equiv(tmp
->range
, drange
))
219 add_ptr_list(&ret
, tmp
);
220 } END_FOR_EACH_PTR(tmp
);
224 static int in_list_exact_sval(struct range_list
*list
, struct data_range
*drange
)
226 struct data_range
*tmp
;
228 FOR_EACH_PTR(list
, tmp
) {
229 if (ranges_equiv(tmp
, drange
))
231 } END_FOR_EACH_PTR(tmp
);
235 static int assign_ranged_funcs(const char *fn
, struct expression
*expr
,
236 struct call_back_list
*call_backs
)
238 struct fcall_back
*tmp
;
242 struct smatch_state
*estate
;
243 struct stree
*tmp_stree
;
244 struct stree
*final_states
= NULL
;
245 struct range_list
*handled_ranges
= NULL
;
246 struct call_back_list
*same_range_call_backs
= NULL
;
252 var_name
= expr_to_var_sym(expr
->left
, &sym
);
253 if (!var_name
|| !sym
)
256 FOR_EACH_PTR(call_backs
, tmp
) {
257 if (tmp
->type
!= RANGED_CALL
)
260 if (in_list_exact_sval(handled_ranges
, tmp
->range
))
262 __push_fake_cur_stree();
263 tack_on(&handled_ranges
, tmp
->range
);
265 same_range_call_backs
= get_same_ranged_call_backs(call_backs
, tmp
->range
);
266 call_ranged_call_backs(same_range_call_backs
, fn
, expr
->right
, expr
);
267 __free_ptr_list((struct ptr_list
**)&same_range_call_backs
);
269 estate
= alloc_estate_range(tmp
->range
->min
, tmp
->range
->max
);
270 set_extra_mod(var_name
, sym
, estate
);
272 tmp_stree
= __pop_fake_cur_stree();
273 merge_fake_stree(&final_states
, tmp_stree
);
274 free_stree(&tmp_stree
);
276 } END_FOR_EACH_PTR(tmp
);
278 FOR_EACH_SM(final_states
, sm
) {
280 } END_FOR_EACH_SM(sm
);
282 free_stree(&final_states
);
284 free_string(var_name
);
288 static void call_implies_callbacks(int comparison
, struct expression
*expr
, sval_t sval
, int left
, struct stree
**implied_true
, struct stree
**implied_false
)
290 struct call_back_list
*call_backs
;
291 struct fcall_back
*tmp
;
293 struct data_range
*value_range
;
294 struct stree
*true_states
= NULL
;
295 struct stree
*false_states
= NULL
;
296 struct stree
*tmp_stree
;
298 *implied_true
= NULL
;
299 *implied_false
= NULL
;
300 if (expr
->fn
->type
!= EXPR_SYMBOL
|| !expr
->fn
->symbol
)
302 fn
= expr
->fn
->symbol
->ident
->name
;
303 call_backs
= search_callback(func_hash
, (char *)expr
->fn
->symbol
->ident
->name
);
306 value_range
= alloc_range(sval
, sval
);
308 /* set true states */
309 __push_fake_cur_stree();
310 FOR_EACH_PTR(call_backs
, tmp
) {
311 if (tmp
->type
!= RANGED_CALL
)
313 if (!true_comparison_range_LR(comparison
, tmp
->range
, value_range
, left
))
315 (tmp
->u
.ranged
)(fn
, expr
, NULL
, tmp
->info
);
316 } END_FOR_EACH_PTR(tmp
);
317 tmp_stree
= __pop_fake_cur_stree();
318 merge_fake_stree(&true_states
, tmp_stree
);
319 free_stree(&tmp_stree
);
321 /* set false states */
322 __push_fake_cur_stree();
323 FOR_EACH_PTR(call_backs
, tmp
) {
324 if (tmp
->type
!= RANGED_CALL
)
326 if (!false_comparison_range_LR(comparison
, tmp
->range
, value_range
, left
))
328 (tmp
->u
.ranged
)(fn
, expr
, NULL
, tmp
->info
);
329 } END_FOR_EACH_PTR(tmp
);
330 tmp_stree
= __pop_fake_cur_stree();
331 merge_fake_stree(&false_states
, tmp_stree
);
332 free_stree(&tmp_stree
);
334 *implied_true
= true_states
;
335 *implied_false
= false_states
;
338 struct db_callback_info
{
341 struct expression
*expr
;
342 struct range_list
*rl
;
345 struct db_implies_list
*callbacks
;
348 struct smatch_state
*ret_state
;
349 struct expression
*var_expr
;
353 static void store_return_state(struct db_callback_info
*db_info
, struct smatch_state
*state
)
355 db_info
->ret_state
= state
;
358 static void set_return_state(struct expression
*expr
, struct db_callback_info
*db_info
)
360 struct smatch_state
*state
;
362 if (!db_info
->ret_state
)
365 state
= alloc_estate_rl(cast_rl(get_type(expr
), clone_rl(estate_rl(db_info
->ret_state
))));
366 set_extra_expr_mod(expr
, state
);
367 db_info
->ret_state
= NULL
;
370 static void handle_ret_equals_param(char *ret_string
, struct range_list
*rl
, struct expression
*call
)
374 struct expression
*arg
;
375 struct range_list
*orig
;
377 str
= strstr(ret_string
, "==$");
381 param
= strtoll(str
, NULL
, 10);
382 arg
= get_argument_from_call_expr(call
->args
, param
);
385 get_absolute_rl(arg
, &orig
);
386 rl
= rl_intersection(orig
, rl
);
389 set_extra_expr_nomod(arg
, alloc_estate_rl(rl
));
392 static int impossible_limit(struct expression
*expr
, int param
, char *key
, char *value
)
394 struct expression
*arg
;
395 struct range_list
*passed
;
396 struct range_list
*limit
;
397 struct symbol
*compare_type
;
399 if (strcmp(key
, "$") != 0)
402 while (expr
->type
== EXPR_ASSIGNMENT
)
403 expr
= strip_expr(expr
->right
);
404 if (expr
->type
!= EXPR_CALL
)
407 arg
= get_argument_from_call_expr(expr
->args
, param
);
410 if (!get_implied_rl(arg
, &passed
))
412 if (!passed
|| is_whole_rl(passed
))
415 compare_type
= get_arg_type(expr
->fn
, param
);
416 passed
= cast_rl(compare_type
, passed
);
417 call_results_to_rl(expr
, compare_type
, value
, &limit
);
418 if (!limit
|| is_whole_rl(limit
))
420 if (possibly_true_rl(passed
, SPECIAL_EQUAL
, limit
))
422 if (option_debug
|| local_debug
)
423 sm_msg("impossible: %d '%s' limit '%s' == '%s'", param
, key
, show_rl(passed
), value
);
427 static int is_impossible_data(int type
, struct expression
*expr
, int param
, char *key
, char *value
)
429 if (type
== PARAM_LIMIT
&& impossible_limit(expr
, param
, key
, value
))
431 if (type
== COMPARE_LIMIT
&& param_compare_limit_is_impossible(expr
, param
, key
, value
))
436 static int db_compare_callback(void *_info
, int argc
, char **argv
, char **azColName
)
438 struct db_callback_info
*db_info
= _info
;
439 struct range_list
*var_rl
= db_info
->rl
;
440 struct range_list
*ret_range
;
443 struct return_implies_callback
*tmp
;
451 return_id
= atoi(argv
[0]);
452 type
= atoi(argv
[2]);
453 param
= atoi(argv
[3]);
457 if (db_info
->prev_return_id
!= -1 && return_id
!= db_info
->prev_return_id
) {
458 set_return_state(db_info
->var_expr
, db_info
);
459 stree
= __pop_fake_cur_stree();
462 merge_fake_stree(&db_info
->stree
, stree
);
464 __push_fake_cur_stree();
467 db_info
->prev_return_id
= return_id
;
471 if (type
== CULL_PATH
) {
476 if (is_impossible_data(type
, db_info
->expr
, param
, key
, value
)) {
481 call_results_to_rl(db_info
->expr
, get_type(strip_expr(db_info
->expr
)), argv
[1], &ret_range
);
482 ret_range
= cast_rl(get_type(db_info
->expr
), ret_range
);
484 ret_range
= alloc_whole_rl(get_type(db_info
->expr
));
486 comparison
= db_info
->comparison
;
488 comparison
= flip_comparison(comparison
);
490 if (db_info
->true_side
) {
491 if (!possibly_true_rl(var_rl
, comparison
, ret_range
))
493 if (type
== PARAM_LIMIT
)
494 param_limit_implications(db_info
->expr
, param
, key
, value
);
495 filter_by_comparison(&var_rl
, comparison
, ret_range
);
496 filter_by_comparison(&ret_range
, flip_comparison(comparison
), var_rl
);
498 if (!possibly_false_rl(var_rl
, comparison
, ret_range
))
500 if (type
== PARAM_LIMIT
)
501 param_limit_implications(db_info
->expr
, param
, key
, value
);
502 filter_by_comparison(&var_rl
, negate_comparison(comparison
), ret_range
);
503 filter_by_comparison(&ret_range
, flip_comparison(negate_comparison(comparison
)), var_rl
);
506 handle_ret_equals_param(argv
[1], ret_range
, db_info
->expr
);
508 if (type
== INTERNAL
)
509 set_state(-1, "unnull_path", NULL
, &true_state
);
511 FOR_EACH_PTR(db_info
->callbacks
, tmp
) {
512 if (tmp
->type
== type
)
513 tmp
->callback(db_info
->expr
, param
, key
, value
);
514 } END_FOR_EACH_PTR(tmp
);
516 store_return_state(db_info
, alloc_estate_rl(clone_rl(var_rl
)));
520 static void compare_db_return_states_callbacks(struct expression
*left
, int comparison
, struct expression
*right
, struct stree
*implied_true
, struct stree
*implied_false
)
522 struct stree
*orig_states
;
524 struct stree
*true_states
;
525 struct stree
*false_states
;
527 struct db_callback_info db_info
= {};
528 struct expression
*var_expr
;
529 struct expression
*call_expr
;
530 struct range_list
*rl
;
533 orig_states
= clone_stree(__get_cur_stree());
535 /* legacy cruft. need to fix call_implies_callbacks(). */
539 if (left
->type
!= EXPR_CALL
) {
545 get_absolute_rl(var_expr
, &rl
);
547 db_info
.comparison
= comparison
;
548 db_info
.expr
= call_expr
;
550 db_info
.left
= call_on_left
;
551 db_info
.callbacks
= db_return_states_list
;
552 db_info
.var_expr
= var_expr
;
554 call_return_states_before_hooks();
556 db_info
.true_side
= 1;
557 db_info
.stree
= NULL
;
558 db_info
.prev_return_id
= -1;
559 __push_fake_cur_stree();
560 sql_select_return_states("return_id, return, type, parameter, key, value",
561 call_expr
, db_compare_callback
, &db_info
);
562 set_return_state(db_info
.var_expr
, &db_info
);
563 stree
= __pop_fake_cur_stree();
565 set_return_state(db_info
.var_expr
, &db_info
);
566 merge_fake_stree(&db_info
.stree
, stree
);
569 true_states
= db_info
.stree
;
570 if (db_info
.cull
&& !true_states
) {
571 __push_fake_cur_stree();
572 set_path_impossible();
573 true_states
= __pop_fake_cur_stree();
578 FOR_EACH_SM(orig_states
, sm
) {
579 __set_sm_cur_stree(sm
);
580 } END_FOR_EACH_SM(sm
);
582 db_info
.true_side
= 0;
583 db_info
.stree
= NULL
;
584 db_info
.prev_return_id
= -1;
586 __push_fake_cur_stree();
587 sql_select_return_states("return_id, return, type, parameter, key, value", call_expr
,
588 db_compare_callback
, &db_info
);
589 stree
= __pop_fake_cur_stree();
591 set_return_state(db_info
.var_expr
, &db_info
);
592 merge_fake_stree(&db_info
.stree
, stree
);
595 false_states
= db_info
.stree
;
596 if (db_info
.cull
&& !false_states
) {
597 __push_fake_cur_stree();
598 set_path_impossible();
599 false_states
= __pop_fake_cur_stree();
604 FOR_EACH_SM(orig_states
, sm
) {
605 __set_sm_cur_stree(sm
);
606 } END_FOR_EACH_SM(sm
);
608 free_stree(&orig_states
);
610 FOR_EACH_SM(true_states
, sm
) {
611 __set_true_false_sm(sm
, NULL
);
612 } END_FOR_EACH_SM(sm
);
613 FOR_EACH_SM(false_states
, sm
) {
614 __set_true_false_sm(NULL
, sm
);
615 } END_FOR_EACH_SM(sm
);
617 free_stree(&true_states
);
618 free_stree(&false_states
);
620 call_return_states_after_hooks(call_expr
);
622 FOR_EACH_SM(implied_true
, sm
) {
623 __set_true_false_sm(sm
, NULL
);
624 } END_FOR_EACH_SM(sm
);
625 FOR_EACH_SM(implied_false
, sm
) {
626 __set_true_false_sm(NULL
, sm
);
627 } END_FOR_EACH_SM(sm
);
630 void function_comparison(struct expression
*left
, int comparison
, struct expression
*right
)
632 struct expression
*var_expr
;
633 struct expression
*call_expr
;
634 struct stree
*implied_true
= NULL
;
635 struct stree
*implied_false
= NULL
;
636 struct range_list
*rl
;
643 /* legacy cruft. need to fix call_implies_callbacks(). */
647 if (left
->type
!= EXPR_CALL
) {
653 get_absolute_rl(var_expr
, &rl
);
655 if (rl_to_sval(rl
, &sval
))
656 call_implies_callbacks(comparison
, call_expr
, sval
, call_on_left
, &implied_true
, &implied_false
);
658 compare_db_return_states_callbacks(left
, comparison
, right
, implied_true
, implied_false
);
659 free_stree(&implied_true
);
660 free_stree(&implied_false
);
663 static void call_ranged_return_hooks(struct db_callback_info
*db_info
)
665 struct call_back_list
*call_backs
;
666 struct expression
*expr
;
667 struct fcall_back
*tmp
;
670 expr
= strip_expr(db_info
->expr
);
671 while (expr
->type
== EXPR_ASSIGNMENT
)
672 expr
= strip_expr(expr
->right
);
673 if (expr
->type
!= EXPR_CALL
||
674 expr
->fn
->type
!= EXPR_SYMBOL
)
677 fn
= expr
->fn
->symbol_name
->name
;
679 call_backs
= search_callback(func_hash
, fn
);
680 FOR_EACH_PTR(call_backs
, tmp
) {
681 struct range_list
*range_rl
= NULL
;
683 if (tmp
->type
!= RANGED_CALL
)
685 add_range(&range_rl
, tmp
->range
->min
, tmp
->range
->max
);
686 range_rl
= cast_rl(estate_type(db_info
->ret_state
), range_rl
);
687 if (possibly_true_rl(range_rl
, SPECIAL_EQUAL
, estate_rl(db_info
->ret_state
))) {
688 if (!possibly_true_rl(rl_invert(range_rl
), SPECIAL_EQUAL
, estate_rl(db_info
->ret_state
)))
689 (tmp
->u
.ranged
)(fn
, expr
, db_info
->expr
, tmp
->info
);
691 db_info
->handled
= -1;
693 } END_FOR_EACH_PTR(tmp
);
696 static int db_assign_return_states_callback(void *_info
, int argc
, char **argv
, char **azColName
)
698 struct db_callback_info
*db_info
= _info
;
699 struct range_list
*ret_range
;
702 struct return_implies_callback
*tmp
;
709 return_id
= atoi(argv
[0]);
710 type
= atoi(argv
[2]);
711 param
= atoi(argv
[3]);
715 if (db_info
->prev_return_id
!= -1 && return_id
!= db_info
->prev_return_id
) {
716 call_ranged_return_hooks(db_info
);
717 set_return_state(db_info
->expr
->left
, db_info
);
718 stree
= __pop_fake_cur_stree();
720 merge_fake_stree(&db_info
->stree
, stree
);
722 __push_fake_cur_stree();
725 db_info
->prev_return_id
= return_id
;
729 if (type
== CULL_PATH
) {
733 if (is_impossible_data(type
, db_info
->expr
, param
, key
, value
)) {
738 if (type
== PARAM_LIMIT
)
739 param_limit_implications(db_info
->expr
, param
, key
, value
);
741 db_info
->handled
= 1;
742 call_results_to_rl(db_info
->expr
->right
, get_type(strip_expr(db_info
->expr
->right
)), argv
[1], &ret_range
);
743 __add_comparison_info(db_info
->expr
->left
, strip_expr(db_info
->expr
->right
), argv
[1]);
745 ret_range
= alloc_whole_rl(get_type(strip_expr(db_info
->expr
->right
)));
746 ret_range
= cast_rl(get_type(db_info
->expr
->right
), ret_range
);
748 if (type
== INTERNAL
)
749 set_state(-1, "unnull_path", NULL
, &true_state
);
751 FOR_EACH_PTR(db_return_states_list
, tmp
) {
752 if (tmp
->type
== type
)
753 tmp
->callback(db_info
->expr
, param
, key
, value
);
754 } END_FOR_EACH_PTR(tmp
);
755 store_return_state(db_info
, alloc_estate_rl(ret_range
));
760 static int db_return_states_assign(struct expression
*expr
)
762 struct expression
*right
;
765 struct db_callback_info db_info
= {};
767 right
= strip_expr(expr
->right
);
769 db_info
.prev_return_id
= -1;
771 db_info
.stree
= NULL
;
774 call_return_states_before_hooks();
776 __push_fake_cur_stree();
777 sql_select_return_states("return_id, return, type, parameter, key, value",
778 right
, db_assign_return_states_callback
, &db_info
);
780 sm_msg("%s return_id %d return_ranges %s",
781 db_info
.cull
? "culled" : "merging",
782 db_info
.prev_return_id
,
783 db_info
.ret_state
? db_info
.ret_state
->name
: "'<empty>'");
786 call_ranged_return_hooks(&db_info
);
787 set_return_state(db_info
.expr
->left
, &db_info
);
788 stree
= __pop_fake_cur_stree();
790 merge_fake_stree(&db_info
.stree
, stree
);
793 if (!db_info
.stree
&& db_info
.cull
) /* this means we culled everything */
794 set_extra_expr_mod(expr
->left
, alloc_estate_whole(get_type(expr
->left
)));
795 FOR_EACH_SM(db_info
.stree
, sm
) {
797 } END_FOR_EACH_SM(sm
);
799 free_stree(&db_info
.stree
);
800 call_return_states_after_hooks(right
);
802 return db_info
.handled
;
805 static int handle_implied_return(struct expression
*expr
)
807 struct range_list
*rl
;
809 if (!get_implied_return(expr
->right
, &rl
))
811 rl
= cast_rl(get_type(expr
->left
), rl
);
812 set_extra_expr_mod(expr
->left
, alloc_estate_rl(rl
));
816 static void match_assign_call(struct expression
*expr
)
818 struct call_back_list
*call_backs
;
820 struct expression
*right
;
822 struct range_list
*rl
;
827 right
= strip_expr(expr
->right
);
828 if (right
->fn
->type
!= EXPR_SYMBOL
|| !right
->fn
->symbol
) {
829 handled
|= db_return_states_assign(expr
);
831 goto assigned_unknown
;
834 if (is_fake_call(right
)) {
835 set_extra_expr_mod(expr
->left
, alloc_estate_whole(get_type(expr
->left
)));
839 fn
= right
->fn
->symbol
->ident
->name
;
842 * some of these conflict (they try to set smatch extra twice), so we
843 * call them in order from least important to most important.
846 call_backs
= search_callback(func_hash
, (char *)fn
);
847 call_call_backs(call_backs
, ASSIGN_CALL
, fn
, expr
);
849 if (db_return_states_assign(expr
) == 1)
852 handled
= assign_ranged_funcs(fn
, expr
, call_backs
);
853 handled
|= handle_implied_return(expr
);
859 get_absolute_rl(expr
->right
, &rl
);
860 rl
= cast_rl(get_type(expr
->left
), rl
);
861 set_extra_expr_mod(expr
->left
, alloc_estate_rl(rl
));
864 static int db_return_states_callback(void *_info
, int argc
, char **argv
, char **azColName
)
866 struct db_callback_info
*db_info
= _info
;
867 struct range_list
*ret_range
;
870 struct return_implies_callback
*tmp
;
878 return_id
= atoi(argv
[0]);
879 type
= atoi(argv
[2]);
880 param
= atoi(argv
[3]);
884 if (db_info
->prev_return_id
!= -1 && return_id
!= db_info
->prev_return_id
) {
885 stree
= __pop_fake_cur_stree();
887 merge_fake_stree(&db_info
->stree
, stree
);
889 __push_fake_cur_stree();
893 db_info
->prev_return_id
= return_id
;
897 if (type
== CULL_PATH
) {
901 if (is_impossible_data(type
, db_info
->expr
, param
, key
, value
)) {
906 if (type
== PARAM_LIMIT
)
907 param_limit_implications(db_info
->expr
, param
, key
, value
);
909 call_results_to_rl(db_info
->expr
, get_type(strip_expr(db_info
->expr
)), argv
[1], &ret_range
);
910 ret_range
= cast_rl(get_type(db_info
->expr
), ret_range
);
912 if (type
== INTERNAL
)
913 set_state(-1, "unnull_path", NULL
, &true_state
);
915 FOR_EACH_PTR(db_return_states_list
, tmp
) {
916 if (tmp
->type
== type
)
917 tmp
->callback(db_info
->expr
, param
, key
, value
);
918 } END_FOR_EACH_PTR(tmp
);
921 * We want to store the return values so that we can split the strees
922 * in smatch_db.c. This uses set_state() directly because it's not a
923 * real smatch_extra state.
925 snprintf(buf
, sizeof(buf
), "return %p", db_info
->expr
);
926 set_state(SMATCH_EXTRA
, buf
, NULL
, alloc_estate_rl(ret_range
));
931 static void db_return_states(struct expression
*expr
)
935 struct db_callback_info db_info
= {};
937 if (!__get_cur_stree()) /* no return functions */
940 db_info
.prev_return_id
= -1;
942 db_info
.stree
= NULL
;
944 call_return_states_before_hooks();
946 __push_fake_cur_stree();
948 sql_select_return_states("return_id, return, type, parameter, key, value",
949 expr
, db_return_states_callback
, &db_info
);
950 stree
= __pop_fake_cur_stree();
952 merge_fake_stree(&db_info
.stree
, stree
);
955 FOR_EACH_SM(db_info
.stree
, sm
) {
957 } END_FOR_EACH_SM(sm
);
959 free_stree(&db_info
.stree
);
960 call_return_states_after_hooks(expr
);
963 static int is_condition_call(struct expression
*expr
)
965 struct expression
*tmp
;
967 FOR_EACH_PTR_REVERSE(big_condition_stack
, tmp
) {
968 if (expr
== tmp
|| expr
->parent
== tmp
)
970 if (tmp
->pos
.line
< expr
->pos
.line
)
972 } END_FOR_EACH_PTR_REVERSE(tmp
);
977 static void db_return_states_call(struct expression
*expr
)
982 if (is_assigned_call(expr
))
984 if (is_condition_call(expr
))
986 db_return_states(expr
);
989 static void match_function_call(struct expression
*expr
)
991 struct call_back_list
*call_backs
;
993 if (expr
->fn
->type
== EXPR_SYMBOL
&& expr
->fn
->symbol
) {
994 call_backs
= search_callback(func_hash
, (char *)expr
->fn
->symbol
->ident
->name
);
996 call_call_backs(call_backs
, REGULAR_CALL
,
997 expr
->fn
->symbol
->ident
->name
, expr
);
999 db_return_states_call(expr
);
1002 static void match_macro_assign(struct expression
*expr
)
1004 struct call_back_list
*call_backs
;
1006 struct expression
*right
;
1008 right
= strip_expr(expr
->right
);
1009 macro
= get_macro_name(right
->pos
);
1010 call_backs
= search_callback(func_hash
, (char *)macro
);
1013 call_call_backs(call_backs
, MACRO_ASSIGN
, macro
, expr
);
1014 call_call_backs(call_backs
, MACRO_ASSIGN_EXTRA
, macro
, expr
);
1017 int get_implied_return(struct expression
*expr
, struct range_list
**rl
)
1019 struct call_back_list
*call_backs
;
1020 struct fcall_back
*tmp
;
1026 expr
= strip_expr(expr
);
1027 fn
= expr_to_var(expr
->fn
);
1031 call_backs
= search_callback(func_hash
, fn
);
1033 FOR_EACH_PTR(call_backs
, tmp
) {
1034 if (tmp
->type
== IMPLIED_RETURN
) {
1035 (tmp
->u
.implied_return
)(expr
, tmp
->info
, rl
);
1038 } END_FOR_EACH_PTR(tmp
);
1045 void create_function_hook_hash(void)
1047 func_hash
= create_function_hashtable(5000);
1050 void register_function_hooks(int id
)
1052 add_hook(&match_function_call
, CALL_HOOK_AFTER_INLINE
);
1053 add_hook(&match_assign_call
, CALL_ASSIGNMENT_HOOK
);
1054 add_hook(&match_macro_assign
, MACRO_ASSIGNMENT_HOOK
);