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.
21 * The param_key hooks are probably the right things to use going forward.
22 * They give you a name/sym pair so it means less code in the checks.
24 * The add_function_hook() functions are trigger for every call. The
25 * "return_implies" are triggered for specific return ranges. The "exact"
26 * variants will be triggered if it's *definitely* in the range where the
27 * others will be triggered if it's *possibly* in the range. The "late"
28 * variants will be triggered after the others have run.
30 * There are a few miscellaneous things like add_function_assign_hook() and
31 * add_macro_assign_hook() which are only triggered for assignments. The
32 * add_implied_return_hook() let's you manually adjust the return range.
35 * add_function_param_key_hook_early()
36 * add_function_param_key_hook()
37 * add_function_param_key_hook_late()
38 * add_param_key_expr_hook()
39 * add_function_hook_early()
42 * Just for some return ranges:
43 * return_implies_param_key()
44 * return_implies_param_key_expr()
45 * return_implies_param_key_exact()
46 * return_implies_state()
47 * select_return_param_key() (It's weird that this is not in smatch_db.c)
50 * add_function_assign_hook()
52 * For Macro Assignments:
53 * add_macro_assign_hook()
55 * Manipulate the return range.
56 * add_implied_return_hook()
63 #include "smatch_slist.h"
64 #include "smatch_extra.h"
65 #include "smatch_function_hashtable.h"
66 #include "smatch_expression_stacks.h"
70 struct data_range
*range
;
73 implication_hook
*ranged
;
74 implied_return_hook
*implied_return
;
79 ALLOCATOR(fcall_back
, "call backs");
80 DECLARE_PTR_LIST(call_back_list
, struct fcall_back
);
82 DEFINE_FUNCTION_HASHTABLE_STATIC(callback
, struct fcall_back
, struct call_back_list
);
83 static struct hashtable
*func_hash
;
85 int __in_fake_parameter_assign
;
99 struct param_key_data
{
100 param_key_hook
*call_back
;
108 expr_func
*call_back
;
113 struct return_implies_callback
{
117 return_implies_hook
*callback
;
118 param_key_hook
*pk_callback
;
121 ALLOCATOR(return_implies_callback
, "return_implies callbacks");
122 DECLARE_PTR_LIST(db_implies_list
, struct return_implies_callback
);
123 static struct db_implies_list
*db_return_states_list
;
125 static struct void_fn_list
*return_states_before
;
126 static struct void_fn_list
*return_states_after
;
127 static struct string_hook_list
*return_string_hooks
;
129 struct db_callback_info
{
132 struct expression
*expr
;
133 struct range_list
*rl
;
136 struct stree
*implied
;
137 struct db_implies_list
*callbacks
;
138 struct db_implies_list
*called
;
144 struct smatch_state
*ret_state
;
145 struct expression
*var_expr
;
146 struct expression_list
*fake_param_assign_stack
;
150 static struct expression_list
*fake_calls
;
152 void add_fake_call_after_return(struct expression
*call
)
154 add_ptr_list(&fake_calls
, call
);
157 static void parse_fake_calls(void)
159 struct expression_list
*list
;
160 struct expression
*call
;
165 FOR_EACH_PTR(list
, call
) {
167 } END_FOR_EACH_PTR(call
);
169 __free_ptr_list((struct ptr_list
**)&list
);
172 static struct fcall_back
*alloc_fcall_back(int type
, void *call_back
,
175 struct fcall_back
*cb
;
177 cb
= __alloc_fcall_back(0);
179 cb
->u
.call_back
= call_back
;
184 static const char *get_fn_name(struct expression
*fn
)
189 if (fn
->type
== EXPR_SYMBOL
&& fn
->symbol
)
190 return fn
->symbol
->ident
->name
;
191 return get_member_name(fn
);
194 static struct call_back_list
*get_call_backs(const char *fn_name
)
198 return search_callback(func_hash
, (char *)fn_name
);
201 void add_function_hook(const char *look_for
, func_hook
*call_back
, void *info
)
203 struct fcall_back
*cb
;
205 cb
= alloc_fcall_back(REGULAR_CALL
, call_back
, info
);
206 add_callback(func_hash
, look_for
, cb
);
209 void add_function_hook_early(const char *look_for
, func_hook
*call_back
, void *info
)
211 struct fcall_back
*cb
;
213 cb
= alloc_fcall_back(REGULAR_CALL_EARLY
, call_back
, info
);
214 add_callback(func_hash
, look_for
, cb
);
217 void add_function_hook_late(const char *look_for
, func_hook
*call_back
, void *info
)
219 struct fcall_back
*cb
;
221 cb
= alloc_fcall_back(REGULAR_CALL_LATE
, call_back
, info
);
222 add_callback(func_hash
, look_for
, cb
);
225 void add_function_assign_hook(const char *look_for
, func_hook
*call_back
,
228 struct fcall_back
*cb
;
230 cb
= alloc_fcall_back(ASSIGN_CALL
, call_back
, info
);
231 add_callback(func_hash
, look_for
, cb
);
234 static void register_funcs_from_file_helper(const char *file
,
235 func_hook
*call_back
, void *info
,
242 snprintf(name
, sizeof(name
), "%s.%s", option_project_str
, file
);
243 token
= get_tokens_file(name
);
246 if (token_type(token
) != TOKEN_STREAMBEGIN
)
249 while (token_type(token
) != TOKEN_STREAMEND
) {
250 if (token_type(token
) != TOKEN_IDENT
)
252 func
= show_ident(token
->ident
);
254 add_function_assign_hook(func
, call_back
, info
);
256 add_function_hook(func
, call_back
, info
);
262 void register_func_hooks_from_file(const char *file
,
263 func_hook
*call_back
, void *info
)
265 register_funcs_from_file_helper(file
, call_back
, info
, false);
268 void register_assign_hooks_from_file(const char *file
,
269 func_hook
*call_back
, void *info
)
271 register_funcs_from_file_helper(file
, call_back
, info
, true);
274 void add_implied_return_hook(const char *look_for
,
275 implied_return_hook
*call_back
,
278 struct fcall_back
*cb
;
280 cb
= alloc_fcall_back(IMPLIED_RETURN
, call_back
, info
);
281 add_callback(func_hash
, look_for
, cb
);
284 static void db_helper(struct expression
*expr
, param_key_hook
*call_back
, int param
, const char *key
, void *info
)
290 call_back(expr
, key
, NULL
, info
);
294 name
= get_name_sym_from_param_key(expr
, param
, key
, &sym
);
298 call_back(expr
, name
, sym
, info
);
303 static struct expression
*get_parent_assignment(struct expression
*expr
)
305 struct expression
*parent
;
308 if (expr
->type
== EXPR_ASSIGNMENT
)
311 parent
= expr_get_fake_parent_expr(expr
);
312 if (parent
&& parent
->type
== EXPR_ASSIGNMENT
)
317 parent
= expr_get_parent_expr(parent
);
318 if (!parent
|| ++cnt
>= 5)
320 if (parent
->type
== EXPR_CAST
)
322 if (parent
->type
== EXPR_PREOP
&& parent
->op
== '(')
327 if (parent
&& parent
->type
== EXPR_ASSIGNMENT
)
332 static void param_key_function(const char *fn
, struct expression
*expr
, void *data
)
334 struct param_key_data
*pkd
= data
;
335 struct expression
*parent
;
337 parent
= get_parent_assignment(expr
);
341 db_helper(expr
, pkd
->call_back
, pkd
->param
, pkd
->key
, pkd
->info
);
344 static void param_key_expr_function(const char *fn
, struct expression
*expr
, void *data
)
346 struct param_key_data
*pkd
= data
;
347 struct expression
*parent
, *arg
;
349 parent
= get_parent_assignment(expr
);
353 arg
= gen_expr_from_param_key(expr
, pkd
->param
, pkd
->key
);
359 static void param_key_implies_function(const char *fn
, struct expression
*call_expr
,
360 struct expression
*assign_expr
, void *data
)
362 struct param_key_data
*pkd
= data
;
364 db_helper(assign_expr
?: call_expr
, pkd
->call_back
, pkd
->param
, pkd
->key
, pkd
->info
);
367 static void param_key_expr_implies_function(const char *fn
, struct expression
*call_expr
,
368 struct expression
*assign_expr
, void *data
)
370 struct param_key_data
*pkd
= data
;
371 struct expression
*arg
;
373 arg
= gen_expr_from_param_key(assign_expr
?: call_expr
, pkd
->param
, pkd
->key
);
379 static struct param_key_data
*alloc_pkd(param_key_hook
*call_back
, int param
, const char *key
, void *info
)
381 struct param_key_data
*pkd
;
383 pkd
= malloc(sizeof(*pkd
));
384 pkd
->call_back
= call_back
;
386 pkd
->key
= alloc_string(key
);
392 static struct param_key_data
*alloc_pked(expr_func
*call_back
, int param
, const char *key
, void *info
)
394 struct param_key_data
*pkd
;
396 pkd
= alloc_pkd(NULL
, param
, key
, info
);
397 pkd
->expr_fn
= call_back
;
402 void add_function_param_key_hook_early(const char *look_for
, param_key_hook
*call_back
,
403 int param
, const char *key
, void *info
)
405 struct param_key_data
*pkd
;
407 pkd
= alloc_pkd(call_back
, param
, key
, info
);
408 add_function_hook_early(look_for
, ¶m_key_function
, pkd
);
411 void add_function_param_key_hook(const char *look_for
, param_key_hook
*call_back
,
412 int param
, const char *key
, void *info
)
414 struct param_key_data
*pkd
;
416 pkd
= alloc_pkd(call_back
, param
, key
, info
);
418 add_function_assign_hook(look_for
, ¶m_key_function
, pkd
);
420 add_function_hook(look_for
, ¶m_key_function
, pkd
);
423 void add_param_key_expr_hook(const char *look_for
, expr_func
*call_back
,
424 int param
, const char *key
, void *info
)
426 struct param_key_data
*pkd
;
428 pkd
= alloc_pked(call_back
, param
, key
, info
);
431 add_function_assign_hook(look_for
, ¶m_key_expr_function
, pkd
);
433 add_function_hook(look_for
, ¶m_key_expr_function
, pkd
);
436 void add_function_param_key_hook_late(const char *look_for
, param_key_hook
*call_back
,
437 int param
, const char *key
, void *info
)
439 struct param_key_data
*pkd
;
441 pkd
= alloc_pkd(call_back
, param
, key
, info
);
442 add_function_hook_late(look_for
, ¶m_key_function
, pkd
);
445 void return_implies_param_key(const char *look_for
, sval_t start
, sval_t end
,
446 param_key_hook
*call_back
,
447 int param
, const char *key
, void *info
)
449 struct param_key_data
*pkd
;
451 pkd
= alloc_pkd(call_back
, param
, key
, info
);
452 return_implies_state_sval(look_for
, start
, end
, ¶m_key_implies_function
, pkd
);
455 void return_implies_param_key_exact(const char *look_for
, sval_t start
, sval_t end
,
456 param_key_hook
*call_back
,
457 int param
, const char *key
, void *info
)
459 struct param_key_data
*pkd
;
461 pkd
= alloc_pkd(call_back
, param
, key
, info
);
462 return_implies_exact(look_for
, start
, end
, ¶m_key_implies_function
, pkd
);
465 void return_implies_param_key_expr(const char *look_for
, sval_t start
, sval_t end
,
466 expr_func
*call_back
,
467 int param
, const char *key
, void *info
)
469 struct param_key_data
*pkd
;
471 pkd
= alloc_pked(call_back
, param
, key
, info
);
472 return_implies_state_sval(look_for
, start
, end
, ¶m_key_expr_implies_function
, pkd
);
475 void add_macro_assign_hook(const char *look_for
, func_hook
*call_back
,
478 struct fcall_back
*cb
;
480 cb
= alloc_fcall_back(MACRO_ASSIGN
, call_back
, info
);
481 add_callback(func_hash
, look_for
, cb
);
484 void add_macro_assign_hook_extra(const char *look_for
, func_hook
*call_back
,
487 struct fcall_back
*cb
;
489 cb
= alloc_fcall_back(MACRO_ASSIGN_EXTRA
, call_back
, info
);
490 add_callback(func_hash
, look_for
, cb
);
493 void return_implies_state(const char *look_for
, long long start
, long long end
,
494 implication_hook
*call_back
, void *info
)
496 struct fcall_back
*cb
;
498 cb
= alloc_fcall_back(RANGED_CALL
, call_back
, info
);
499 cb
->range
= alloc_range_perm(ll_to_sval(start
), ll_to_sval(end
));
500 add_callback(func_hash
, look_for
, cb
);
503 void return_implies_state_sval(const char *look_for
, sval_t start
, sval_t end
,
504 implication_hook
*call_back
, void *info
)
506 struct fcall_back
*cb
;
508 cb
= alloc_fcall_back(RANGED_CALL
, call_back
, info
);
509 cb
->range
= alloc_range_perm(start
, end
);
510 add_callback(func_hash
, look_for
, cb
);
513 void return_implies_exact(const char *look_for
, sval_t start
, sval_t end
,
514 implication_hook
*call_back
, void *info
)
516 struct fcall_back
*cb
;
518 cb
= alloc_fcall_back(RANGED_EXACT
, call_back
, info
);
519 cb
->range
= alloc_range_perm(start
, end
);
520 add_callback(func_hash
, look_for
, cb
);
523 static struct return_implies_callback
*alloc_db_return_callback(int type
, bool param_key
, void *callback
)
525 struct return_implies_callback
*cb
;
527 cb
= __alloc_return_implies_callback(0);
529 cb
->param_key
= param_key
;
530 cb
->callback
= callback
;
535 void select_return_states_hook(int type
, return_implies_hook
*callback
)
537 struct return_implies_callback
*cb
;
539 cb
= alloc_db_return_callback(type
, false, callback
);
540 add_ptr_list(&db_return_states_list
, cb
);
543 static void call_db_return_callback(struct db_callback_info
*db_info
,
544 struct return_implies_callback
*cb
,
545 int param
, char *key
, char *value
)
548 db_helper(db_info
->expr
, cb
->pk_callback
, param
, key
, NULL
);
549 add_ptr_list(&db_info
->called
, cb
);
551 cb
->callback(db_info
->expr
, param
, key
, value
);
555 void select_return_param_key(int type
, param_key_hook
*callback
)
557 struct return_implies_callback
*cb
;
559 cb
= alloc_db_return_callback(type
, true, callback
);
560 add_ptr_list(&db_return_states_list
, cb
);
563 void select_return_states_before(void_fn
*fn
)
565 add_ptr_list(&return_states_before
, fn
);
568 void select_return_states_after(void_fn
*fn
)
570 add_ptr_list(&return_states_after
, fn
);
573 void add_return_string_hook(string_hook
*fn
)
575 add_ptr_list(&return_string_hooks
, fn
);
578 static bool call_call_backs(struct call_back_list
*list
, int type
,
579 const char *fn
, struct expression
*expr
)
581 struct fcall_back
*tmp
;
582 bool handled
= false;
584 FOR_EACH_PTR(list
, tmp
) {
585 if (tmp
->type
== type
) {
586 (tmp
->u
.call_back
)(fn
, expr
, tmp
->info
);
589 } END_FOR_EACH_PTR(tmp
);
594 static void call_function_hooks(struct expression
*expr
, enum fn_hook_type type
)
596 struct call_back_list
*call_backs
;
599 while (expr
->type
== EXPR_ASSIGNMENT
)
600 expr
= strip_expr(expr
->right
);
601 if (expr
->type
!= EXPR_CALL
)
604 fn_name
= get_fn_name(expr
->fn
);
605 call_backs
= get_call_backs(fn_name
);
609 call_call_backs(call_backs
, type
, fn_name
, expr
);
612 static void call_return_states_after_hooks(struct expression
*expr
)
614 call_void_fns(return_states_after
);
615 __pass_to_client(expr
, FUNCTION_CALL_HOOK_AFTER_DB
);
616 call_function_hooks(expr
, REGULAR_CALL_LATE
);
619 static void call_ranged_call_backs(struct call_back_list
*list
,
620 const char *fn
, struct expression
*call_expr
,
621 struct expression
*assign_expr
)
623 struct fcall_back
*tmp
;
625 FOR_EACH_PTR(list
, tmp
) {
626 (tmp
->u
.ranged
)(fn
, call_expr
, assign_expr
, tmp
->info
);
627 } END_FOR_EACH_PTR(tmp
);
630 static struct call_back_list
*get_same_ranged_call_backs(struct call_back_list
*list
,
631 struct data_range
*drange
)
633 struct call_back_list
*ret
= NULL
;
634 struct fcall_back
*tmp
;
636 FOR_EACH_PTR(list
, tmp
) {
637 if (tmp
->type
!= RANGED_CALL
&&
638 tmp
->type
!= RANGED_EXACT
)
640 if (ranges_equiv(tmp
->range
, drange
))
641 add_ptr_list(&ret
, tmp
);
642 } END_FOR_EACH_PTR(tmp
);
646 static bool in_list_exact_sval(struct range_list
*list
, struct data_range
*drange
)
648 struct data_range
*tmp
;
650 FOR_EACH_PTR(list
, tmp
) {
651 if (ranges_equiv(tmp
, drange
))
653 } END_FOR_EACH_PTR(tmp
);
658 * The assign_ranged_funcs() function is called when we have no data from the DB.
660 static bool assign_ranged_funcs(const char *fn
, struct expression
*expr
,
661 struct call_back_list
*call_backs
)
663 struct fcall_back
*tmp
;
667 struct smatch_state
*estate
;
668 struct stree
*tmp_stree
;
669 struct stree
*final_states
= NULL
;
670 struct range_list
*handled_ranges
= NULL
;
671 struct range_list
*unhandled_rl
;
672 struct call_back_list
*same_range_call_backs
= NULL
;
673 struct expression
*call
;
674 struct range_list
*rl
;
680 var_name
= expr_to_var_sym(expr
->left
, &sym
);
681 if (!var_name
|| !sym
)
684 call
= strip_expr(expr
->right
);
686 FOR_EACH_PTR(call_backs
, tmp
) {
687 if (tmp
->type
!= RANGED_CALL
&&
688 tmp
->type
!= RANGED_EXACT
)
691 if (in_list_exact_sval(handled_ranges
, tmp
->range
))
693 __push_fake_cur_stree();
694 tack_on(&handled_ranges
, tmp
->range
);
696 same_range_call_backs
= get_same_ranged_call_backs(call_backs
, tmp
->range
);
697 call_ranged_call_backs(same_range_call_backs
, fn
, expr
->right
, expr
);
698 __free_ptr_list((struct ptr_list
**)&same_range_call_backs
);
700 rl
= alloc_rl(tmp
->range
->min
, tmp
->range
->max
);
701 rl
= cast_rl(get_type(expr
->left
), rl
);
702 estate
= alloc_estate_rl(rl
);
703 set_extra_mod(var_name
, sym
, expr
->left
, estate
);
705 tmp_stree
= __pop_fake_cur_stree();
706 merge_fake_stree(&final_states
, tmp_stree
);
707 free_stree(&tmp_stree
);
709 } END_FOR_EACH_PTR(tmp
);
711 unhandled_rl
= rl_filter(alloc_whole_rl(get_type(call
)), handled_ranges
);
713 __push_fake_cur_stree();
714 rl
= cast_rl(get_type(expr
->left
), unhandled_rl
);
715 estate
= alloc_estate_rl(rl
);
716 set_extra_mod(var_name
, sym
, expr
->left
, estate
);
717 tmp_stree
= __pop_fake_cur_stree();
718 merge_fake_stree(&final_states
, tmp_stree
);
719 free_stree(&tmp_stree
);
722 FOR_EACH_SM(final_states
, sm
) {
724 } END_FOR_EACH_SM(sm
);
726 free_stree(&final_states
);
728 free_string(var_name
);
732 static void call_implies_callbacks(int comparison
, struct expression
*expr
, sval_t sval
, int left
, struct stree
**implied_true
, struct stree
**implied_false
)
734 struct call_back_list
*call_backs
;
735 struct fcall_back
*tmp
;
737 struct data_range
*value_range
;
738 struct stree
*true_states
= NULL
;
739 struct stree
*false_states
= NULL
;
740 struct stree
*tmp_stree
;
742 *implied_true
= NULL
;
743 *implied_false
= NULL
;
744 fn_name
= get_fn_name(expr
->fn
);
745 call_backs
= get_call_backs(fn_name
);
748 value_range
= alloc_range(sval
, sval
);
750 /* set true states */
751 __push_fake_cur_stree();
752 FOR_EACH_PTR(call_backs
, tmp
) {
753 if (tmp
->type
!= RANGED_CALL
&&
754 tmp
->type
!= RANGED_EXACT
)
756 if (!true_comparison_range_LR(comparison
, tmp
->range
, value_range
, left
))
758 (tmp
->u
.ranged
)(fn_name
, expr
, NULL
, tmp
->info
);
759 } END_FOR_EACH_PTR(tmp
);
760 tmp_stree
= __pop_fake_cur_stree();
761 merge_fake_stree(&true_states
, tmp_stree
);
762 free_stree(&tmp_stree
);
764 /* set false states */
765 __push_fake_cur_stree();
766 FOR_EACH_PTR(call_backs
, tmp
) {
767 if (tmp
->type
!= RANGED_CALL
&&
768 tmp
->type
!= RANGED_EXACT
)
770 if (!false_comparison_range_LR(comparison
, tmp
->range
, value_range
, left
))
772 (tmp
->u
.ranged
)(fn_name
, expr
, NULL
, tmp
->info
);
773 } END_FOR_EACH_PTR(tmp
);
774 tmp_stree
= __pop_fake_cur_stree();
775 merge_fake_stree(&false_states
, tmp_stree
);
776 free_stree(&tmp_stree
);
778 *implied_true
= true_states
;
779 *implied_false
= false_states
;
782 static void set_implied_states(struct db_callback_info
*db_info
)
786 FOR_EACH_SM(db_info
->implied
, sm
) {
788 } END_FOR_EACH_SM(sm
);
790 free_stree(&db_info
->implied
);
793 static void store_return_state(struct db_callback_info
*db_info
, const char *ret_str
, struct smatch_state
*state
)
795 db_info
->ret_str
= alloc_sname(ret_str
),
796 db_info
->ret_state
= state
;
799 static struct expression_list
*unfaked_calls
;
801 struct expression
*get_unfaked_call(void)
803 return last_ptr_list((struct ptr_list
*)unfaked_calls
);
806 static void store_unfaked_call(struct expression
*expr
)
808 push_expression(&unfaked_calls
, expr
);
811 static void clear_unfaked_call(void)
813 delete_ptr_list_last((struct ptr_list
**)&unfaked_calls
);
816 void fake_param_assign_helper(struct expression
*call
, struct expression
*fake_assign
, bool shallow
)
818 store_unfaked_call(call
);
819 __in_fake_parameter_assign
++;
820 parse_assignment(fake_assign
, true);
821 __in_fake_parameter_assign
--;
822 clear_unfaked_call();
825 static bool fake_a_param_assignment(struct expression
*expr
, const char *ret_str
, struct smatch_state
*orig
)
827 struct expression
*arg
, *left
, *right
, *tmp
, *fake_assign
;
833 if (expr
->type
!= EXPR_ASSIGNMENT
|| expr
->op
!= '=')
838 while (right
->type
== EXPR_ASSIGNMENT
)
839 right
= strip_expr(right
->right
);
840 if (!right
|| right
->type
!= EXPR_CALL
)
843 p
= strchr(ret_str
, '[');
848 if (p
[0] == '=' && p
[1] == '=')
853 snprintf(buf
, sizeof(buf
), "%s", p
);
857 param
= strtol(p
, &p
, 10);
864 arg
= get_argument_from_call_expr(right
->args
, param
);
868 /* There should be a get_other_name() function which returns an expr */
869 tmp
= get_assigned_expr(arg
);
874 * This is a sanity check to prevent side effects from evaluating stuff
877 str
= expr_to_chunk_sym_vsl(arg
, NULL
, NULL
);
882 right
= gen_expression_from_key(arg
, buf
);
883 if (!right
) /* Mostly fails for binops like [$0 + 4032] */
885 fake_assign
= assign_expression(left
, '=', right
);
886 fake_param_assign_helper(expr
, fake_assign
, false);
889 * If the return is "0-65531[$0->nla_len - 4]" the faked expression
890 * is maybe (-4)-65531 but we know it is in the 0-65531 range so both
891 * parts have to be considered. We use _nomod() because it's not really
892 * another modification, it's just a clarification.
895 if (estate_rl(orig
)) {
896 struct smatch_state
*faked
;
897 struct range_list
*rl
;
899 faked
= get_extra_state(left
);
900 if (estate_rl(faked
)) {
901 rl
= rl_intersection(estate_rl(faked
), estate_rl(orig
));
903 set_extra_expr_nomod(left
, alloc_estate_rl(rl
));
910 static void fake_return_assignment(struct db_callback_info
*db_info
, int type
, int param
, char *key
, char *value
)
912 struct expression
*call
, *left
, *right
, *assign
;
915 if (type
!= PARAM_COMPARE
)
918 call
= db_info
->expr
;
919 while (call
&& call
->type
== EXPR_ASSIGNMENT
)
920 call
= strip_expr(call
->right
);
921 if (!call
|| call
->type
!= EXPR_CALL
)
924 // TODO: This only handles "$->foo = arg" and not "$->foo = arg->bar".
927 if (!value
|| strncmp(value
, "== $", 4) != 0)
929 if (!isdigit(value
[4]) || value
[5] != '\0')
931 right_param
= atoi(value
+ 4);
933 left
= gen_expr_from_param_key(db_info
->expr
, param
, key
);
936 right
= get_argument_from_call_expr(call
->args
, right_param
);
938 assign
= assign_expression(left
, '=', right
);
939 push_expression(&db_info
->fake_param_assign_stack
, assign
);
942 static void set_fresh_mtag_returns(struct db_callback_info
*db_info
)
944 struct expression
*expr
;
945 struct smatch_state
*state
;
947 if (!db_info
->ret_state
)
950 if (!db_info
->expr
||
951 db_info
->expr
->type
!= EXPR_ASSIGNMENT
||
952 db_info
->expr
->op
!= '=')
955 expr
= db_info
->expr
->left
;
957 state
= alloc_estate_rl(cast_rl(get_type(expr
), clone_rl(estate_rl(db_info
->ret_state
))));
958 state
= get_mtag_return(db_info
->expr
, state
);
962 set_real_absolute(expr
, state
);
963 set_extra_expr_mod(expr
, state
);
966 static void set_return_assign_state(struct db_callback_info
*db_info
)
968 struct expression
*expr
= db_info
->expr
->left
;
969 struct expression
*fake_assign
;
970 struct smatch_state
*state
;
971 bool was_set
= false;
973 if (!db_info
->ret_state
)
976 state
= alloc_estate_rl(cast_rl(get_type(expr
), clone_rl(estate_rl(db_info
->ret_state
))));
977 if (!fake_a_param_assignment(db_info
->expr
, db_info
->ret_str
, state
)) {
978 set_extra_expr_mod(expr
, state
);
982 while ((fake_assign
= pop_expression(&db_info
->fake_param_assign_stack
))) {
983 struct range_list
*right
;
986 * Originally, I tried to do this as a assignment to record that
987 * a = frob(b) implies that "a->foo == b->foo" etc. But that
988 * caused a problem because then it was recorded that "a->foo"
989 * was modified and recorded as a PARAM_SET in the database.
991 * So now, instead of faking an assignment we use
992 * set_extra_expr_nomod() but it's still recorded as an
993 * assignment in the ->fake_param_assign_stack for legacy
994 * reasons and because it's a handy way to store a left/right
998 get_absolute_rl(fake_assign
->right
, &right
);
999 right
= cast_rl(get_type(fake_assign
->left
), right
);
1000 // FIXME: add some sanity checks
1001 // FIXME: preserve the sm state if possible
1002 set_extra_expr_nomod(fake_assign
->left
, alloc_estate_rl(right
));
1007 set_extra_expr_mod(expr
, state
);
1010 static void set_other_side_state(struct db_callback_info
*db_info
)
1012 struct expression
*expr
= db_info
->var_expr
;
1013 struct smatch_state
*state
;
1015 if (!db_info
->ret_state
)
1018 // TODO: faked_assign set ==$ equiv here
1020 state
= alloc_estate_rl(cast_rl(get_type(expr
), clone_rl(estate_rl(db_info
->ret_state
))));
1021 set_extra_expr_nomod(expr
, state
);
1022 db_info
->ret_state
= NULL
;
1023 db_info
->ret_str
= NULL
;
1026 static void handle_ret_equals_param(char *ret_string
, struct range_list
*rl
, struct expression
*call
)
1030 struct expression
*arg
;
1031 struct range_list
*orig
;
1033 // TODO: faked_assign This needs to be handled in the assignment code
1035 str
= strstr(ret_string
, "==$");
1039 param
= strtoll(str
, NULL
, 10);
1040 arg
= get_argument_from_call_expr(call
->args
, param
);
1043 get_absolute_rl(arg
, &orig
);
1044 rl
= rl_intersection(orig
, rl
);
1047 set_extra_expr_nomod(arg
, alloc_estate_rl(rl
));
1050 static bool impossible_limit(struct db_callback_info
*db_info
, int param
, char *key
, char *value
)
1052 struct expression
*expr
= db_info
->expr
;
1053 struct expression
*arg
;
1054 struct smatch_state
*state
;
1055 struct range_list
*passed
;
1056 struct range_list
*limit
;
1057 struct symbol
*compare_type
;
1059 while (expr
->type
== EXPR_ASSIGNMENT
)
1060 expr
= strip_expr(expr
->right
);
1061 if (expr
->type
!= EXPR_CALL
)
1064 arg
= get_argument_from_call_expr(expr
->args
, param
);
1068 if (strcmp(key
, "$") == 0) {
1069 if (!get_implied_rl(arg
, &passed
))
1072 compare_type
= get_arg_type(expr
->fn
, param
);
1077 name
= get_variable_from_key(arg
, key
, &sym
);
1081 state
= get_state(SMATCH_EXTRA
, name
, sym
);
1086 passed
= estate_rl(state
);
1087 if (!passed
|| is_whole_rl(passed
)) {
1092 compare_type
= get_member_type_from_key(arg
, key
);
1095 passed
= cast_rl(compare_type
, passed
);
1096 call_results_to_rl(expr
, compare_type
, value
, &limit
);
1097 if (!limit
|| is_whole_rl(limit
))
1099 if (possibly_true_rl(passed
, SPECIAL_EQUAL
, limit
))
1101 if (option_debug
|| local_debug
|| debug_db
)
1102 sm_msg("impossible: %d '%s' limit '%s' == '%s' return='%s'", param
, key
, show_rl(passed
), value
, db_info
->ret_str
);
1106 static bool is_impossible_data(int type
, struct db_callback_info
*db_info
, int param
, char *key
, char *value
)
1108 if (type
== PARAM_LIMIT
&& impossible_limit(db_info
, param
, key
, value
))
1110 if (type
== COMPARE_LIMIT
&& param_compare_limit_is_impossible(db_info
->expr
, param
, key
, value
)) {
1111 if (local_debug
|| debug_db
)
1112 sm_msg("param_compare_limit_is_impossible: %d %s %s", param
, key
, value
);
1118 static bool func_type_mismatch(struct expression
*expr
, const char *value
)
1120 struct symbol
*type
;
1122 /* This makes faking returns easier */
1123 if (!value
|| value
[0] == '\0')
1126 while (expr
->type
== EXPR_ASSIGNMENT
)
1127 expr
= strip_expr(expr
->right
);
1130 * Short cut: We only care about function pointers that are struct
1134 if (expr
->fn
->type
== EXPR_SYMBOL
)
1137 type
= get_type(expr
->fn
);
1140 if (type
->type
== SYM_PTR
)
1141 type
= get_real_base_type(type
);
1143 if (strcmp(type_to_str(type
), value
) == 0)
1149 static void process_return_states(struct db_callback_info
*db_info
)
1151 struct stree
*stree
;
1153 set_implied_states(db_info
);
1154 set_fresh_mtag_returns(db_info
);
1156 free_ptr_list(&db_info
->called
);
1157 stree
= __pop_fake_cur_stree();
1159 sm_msg("States from DB: %s expr='%s' ret_str='%s' rl='%s' state='%s'",
1160 db_info
->cull
? "Culling" : "Merging",
1161 expr_to_str(db_info
->expr
),
1162 db_info
->ret_str
, show_rl(db_info
->rl
),
1163 db_info
->ret_state
? db_info
->ret_state
->name
: "<none>");
1164 __print_stree(stree
);
1167 if (!db_info
->cull
) {
1168 merge_fake_stree(&db_info
->stree
, stree
);
1169 db_info
->states_merged
= true;
1173 db_info
->ret_state
= NULL
;
1174 db_info
->ret_str
= NULL
;
1177 static int db_compare_callback(void *_info
, int argc
, char **argv
, char **azColName
)
1179 struct db_callback_info
*db_info
= _info
;
1180 struct range_list
*var_rl
= db_info
->rl
;
1181 struct range_list
*ret_range
;
1183 char *ret_str
, *key
, *value
;
1184 struct return_implies_callback
*tmp
;
1191 return_id
= atoi(argv
[0]);
1193 type
= atoi(argv
[2]);
1194 param
= atoi(argv
[3]);
1198 db_info
->has_states
= 1;
1199 if (db_info
->prev_return_id
!= -1 && type
== INTERNAL
) {
1200 set_other_side_state(db_info
);
1201 process_return_states(db_info
);
1202 __push_fake_cur_stree();
1205 db_info
->prev_return_id
= return_id
;
1207 if (type
== INTERNAL
&& func_type_mismatch(db_info
->expr
, value
))
1211 if (type
== CULL_PATH
) {
1216 if (is_impossible_data(type
, db_info
, param
, key
, value
)) {
1221 call_results_to_rl(db_info
->expr
, get_type(strip_expr(db_info
->expr
)), ret_str
, &ret_range
);
1222 ret_range
= cast_rl(get_type(db_info
->expr
), ret_range
);
1224 ret_range
= alloc_whole_rl(get_type(db_info
->expr
));
1226 comparison
= db_info
->comparison
;
1228 comparison
= flip_comparison(comparison
);
1230 if (db_info
->true_side
) {
1231 if (!possibly_true_rl(var_rl
, comparison
, ret_range
))
1233 if (type
== PARAM_LIMIT
)
1234 param_limit_implications(db_info
->expr
, param
, key
, value
, &db_info
->implied
);
1235 else if (type
> PARAM_LIMIT
)
1236 set_implied_states(db_info
);
1237 filter_by_comparison(&var_rl
, comparison
, ret_range
);
1238 filter_by_comparison(&ret_range
, flip_comparison(comparison
), var_rl
);
1240 if (!possibly_false_rl(var_rl
, comparison
, ret_range
))
1242 if (type
== PARAM_LIMIT
)
1243 param_limit_implications(db_info
->expr
, param
, key
, value
, &db_info
->implied
);
1244 else if (type
> PARAM_LIMIT
)
1245 set_implied_states(db_info
);
1246 filter_by_comparison(&var_rl
, negate_comparison(comparison
), ret_range
);
1247 filter_by_comparison(&ret_range
, flip_comparison(negate_comparison(comparison
)), var_rl
);
1250 handle_ret_equals_param(ret_str
, ret_range
, db_info
->expr
);
1252 if (type
== INTERNAL
) {
1253 set_state(-1, "unnull_path", NULL
, &true_state
);
1254 call_string_hooks(return_string_hooks
, db_info
->expr
, ret_str
);
1255 store_return_state(db_info
, ret_str
, alloc_estate_rl(clone_rl(var_rl
)));
1258 FOR_EACH_PTR(db_info
->callbacks
, tmp
) {
1259 if (tmp
->type
== type
)
1260 call_db_return_callback(db_info
, tmp
, param
, key
, value
);
1261 } END_FOR_EACH_PTR(tmp
);
1263 fake_return_assignment(db_info
, type
, param
, key
, value
);
1268 static void compare_db_return_states_callbacks(struct expression
*left
, int comparison
, struct expression
*right
, struct stree
*implied_true
, struct stree
*implied_false
)
1270 struct stree
*orig_states
;
1271 struct stree
*true_states
;
1272 struct stree
*false_states
;
1273 struct sm_state
*sm
;
1274 struct db_callback_info db_info
= {};
1275 struct expression
*var_expr
;
1276 struct expression
*call_expr
;
1277 struct range_list
*rl
;
1280 orig_states
= clone_stree(__get_cur_stree());
1282 /* legacy cruft. need to fix call_implies_callbacks(). */
1286 if (left
->type
!= EXPR_CALL
) {
1292 get_absolute_rl(var_expr
, &rl
);
1294 db_info
.comparison
= comparison
;
1295 db_info
.expr
= call_expr
;
1297 db_info
.left
= call_on_left
;
1298 db_info
.callbacks
= db_return_states_list
;
1299 db_info
.var_expr
= var_expr
;
1301 call_void_fns(return_states_before
);
1303 db_info
.true_side
= 1;
1304 db_info
.stree
= NULL
;
1305 db_info
.prev_return_id
= -1;
1306 __push_fake_cur_stree();
1307 sql_select_return_states("return_id, return, type, parameter, key, value",
1308 call_expr
, db_compare_callback
, &db_info
);
1309 set_other_side_state(&db_info
);
1310 process_return_states(&db_info
);
1311 true_states
= db_info
.stree
;
1312 if (!true_states
&& db_info
.has_states
) {
1313 __push_fake_cur_stree();
1314 set_path_impossible();
1315 true_states
= __pop_fake_cur_stree();
1320 FOR_EACH_SM(orig_states
, sm
) {
1321 __set_sm_cur_stree(sm
);
1322 } END_FOR_EACH_SM(sm
);
1324 db_info
.true_side
= 0;
1325 db_info
.stree
= NULL
;
1326 db_info
.prev_return_id
= -1;
1328 __push_fake_cur_stree();
1329 sql_select_return_states("return_id, return, type, parameter, key, value", call_expr
,
1330 db_compare_callback
, &db_info
);
1331 set_other_side_state(&db_info
);
1332 process_return_states(&db_info
);
1333 false_states
= db_info
.stree
;
1334 if (!false_states
&& db_info
.has_states
) {
1335 __push_fake_cur_stree();
1336 set_path_impossible();
1337 false_states
= __pop_fake_cur_stree();
1342 FOR_EACH_SM(orig_states
, sm
) {
1343 __set_sm_cur_stree(sm
);
1344 } END_FOR_EACH_SM(sm
);
1346 free_stree(&orig_states
);
1348 FOR_EACH_SM(true_states
, sm
) {
1349 __set_true_false_sm(sm
, NULL
);
1350 } END_FOR_EACH_SM(sm
);
1351 FOR_EACH_SM(false_states
, sm
) {
1352 __set_true_false_sm(NULL
, sm
);
1353 } END_FOR_EACH_SM(sm
);
1355 free_stree(&true_states
);
1356 free_stree(&false_states
);
1358 if (!db_info
.states_merged
)
1359 mark_call_params_untracked(call_expr
);
1361 call_return_states_after_hooks(call_expr
);
1363 FOR_EACH_SM(implied_true
, sm
) {
1364 __set_true_false_sm(sm
, NULL
);
1365 } END_FOR_EACH_SM(sm
);
1366 FOR_EACH_SM(implied_false
, sm
) {
1367 __set_true_false_sm(NULL
, sm
);
1368 } END_FOR_EACH_SM(sm
);
1371 void function_comparison(struct expression
*left
, int comparison
, struct expression
*right
)
1373 struct expression
*var_expr
;
1374 struct expression
*call_expr
;
1375 struct stree
*implied_true
= NULL
;
1376 struct stree
*implied_false
= NULL
;
1377 struct range_list
*rl
;
1381 // TODO: faked_assign delete this
1382 // condition calls should be faked and then handled as assignments
1383 // this code is a lazy work around
1388 /* legacy cruft. need to fix call_implies_callbacks(). */
1392 if (left
->type
!= EXPR_CALL
) {
1398 get_absolute_rl(var_expr
, &rl
);
1400 if (rl_to_sval(rl
, &sval
))
1401 call_implies_callbacks(comparison
, call_expr
, sval
, call_on_left
, &implied_true
, &implied_false
);
1403 compare_db_return_states_callbacks(left
, comparison
, right
, implied_true
, implied_false
);
1404 free_stree(&implied_true
);
1405 free_stree(&implied_false
);
1408 static void call_ranged_return_hooks(struct db_callback_info
*db_info
)
1410 struct call_back_list
*call_backs
;
1411 struct range_list
*range_rl
;
1412 struct expression
*expr
;
1413 struct fcall_back
*tmp
;
1414 const char *fn_name
;
1416 expr
= strip_expr(db_info
->expr
);
1417 while (expr
->type
== EXPR_ASSIGNMENT
)
1418 expr
= strip_expr(expr
->right
);
1419 if (expr
->type
!= EXPR_CALL
)
1422 fn_name
= get_fn_name(expr
->fn
);
1423 call_backs
= get_call_backs(fn_name
);
1424 FOR_EACH_PTR(call_backs
, tmp
) {
1425 if (tmp
->type
!= RANGED_CALL
)
1427 range_rl
= alloc_rl(tmp
->range
->min
, tmp
->range
->max
);
1428 range_rl
= cast_rl(estate_type(db_info
->ret_state
), range_rl
);
1429 if (possibly_true_rl(range_rl
, SPECIAL_EQUAL
, estate_rl(db_info
->ret_state
)))
1430 (tmp
->u
.ranged
)(fn_name
, expr
, db_info
->expr
, tmp
->info
);
1431 } END_FOR_EACH_PTR(tmp
);
1433 FOR_EACH_PTR(call_backs
, tmp
) {
1434 if (tmp
->type
!= RANGED_EXACT
)
1436 if (!estate_rl(db_info
->ret_state
))
1439 range_rl
= alloc_rl(tmp
->range
->min
, tmp
->range
->max
);
1440 range_rl
= cast_rl(estate_type(db_info
->ret_state
), range_rl
);
1443 * If there is an returned value out of range then this is not
1444 * an exact match. In other words, "0,4096-ptr_max" is not
1445 * necessarily a valid match.
1448 if (remove_range(estate_rl(db_info
->ret_state
),
1449 rl_min(range_rl
), rl_max(range_rl
)))
1451 (tmp
->u
.ranged
)(fn_name
, expr
, db_info
->expr
, tmp
->info
);
1452 } END_FOR_EACH_PTR(tmp
);
1455 static int db_assign_return_states_callback(void *_info
, int argc
, char **argv
, char **azColName
)
1457 struct db_callback_info
*db_info
= _info
;
1458 struct range_list
*ret_range
;
1460 char *ret_str
, *key
, *value
;
1461 struct return_implies_callback
*tmp
;
1467 return_id
= atoi(argv
[0]);
1469 type
= atoi(argv
[2]);
1470 param
= atoi(argv
[3]);
1474 if (db_info
->prev_return_id
!= -1 && type
== INTERNAL
) {
1475 call_ranged_return_hooks(db_info
);
1476 set_return_assign_state(db_info
);
1477 process_return_states(db_info
);
1478 __push_fake_cur_stree();
1481 db_info
->prev_return_id
= return_id
;
1483 if (type
== INTERNAL
&& func_type_mismatch(db_info
->expr
, value
))
1487 if (type
== CULL_PATH
) {
1491 if (is_impossible_data(type
, db_info
, param
, key
, value
)) {
1496 if (type
== PARAM_LIMIT
)
1497 param_limit_implications(db_info
->expr
, param
, key
, value
, &db_info
->implied
);
1498 else if (type
> PARAM_LIMIT
)
1499 set_implied_states(db_info
);
1501 db_info
->handled
= 1;
1502 call_results_to_rl(db_info
->expr
->right
, get_type(strip_expr(db_info
->expr
->right
)), ret_str
, &ret_range
);
1504 ret_range
= alloc_whole_rl(get_type(strip_expr(db_info
->expr
->right
)));
1505 ret_range
= cast_rl(get_type(db_info
->expr
->right
), ret_range
);
1507 if (type
== INTERNAL
) {
1508 set_state(-1, "unnull_path", NULL
, &true_state
);
1509 __add_comparison_info(db_info
->expr
->left
, strip_expr(db_info
->expr
->right
), ret_str
);
1510 call_string_hooks(return_string_hooks
, db_info
->expr
, ret_str
);
1511 store_return_state(db_info
, ret_str
, alloc_estate_rl(ret_range
));
1514 FOR_EACH_PTR(db_return_states_list
, tmp
) {
1515 if (tmp
->type
== type
)
1516 call_db_return_callback(db_info
, tmp
, param
, key
, value
);
1517 } END_FOR_EACH_PTR(tmp
);
1519 fake_return_assignment(db_info
, type
, param
, key
, value
);
1524 static int db_return_states_assign(struct expression
*expr
)
1526 struct expression
*right
;
1527 struct sm_state
*sm
;
1528 struct db_callback_info db_info
= {};
1530 right
= strip_expr(expr
->right
);
1532 db_info
.prev_return_id
= -1;
1533 db_info
.expr
= expr
;
1534 db_info
.stree
= NULL
;
1535 db_info
.handled
= 0;
1537 call_void_fns(return_states_before
);
1539 __push_fake_cur_stree();
1540 sql_select_return_states("return_id, return, type, parameter, key, value",
1541 right
, db_assign_return_states_callback
, &db_info
);
1543 sm_msg("%s return_id %d return_ranges %s",
1544 db_info
.cull
? "culled" : "merging",
1545 db_info
.prev_return_id
,
1546 db_info
.ret_state
? db_info
.ret_state
->name
: "'<empty>'");
1548 if (db_info
.handled
)
1549 call_ranged_return_hooks(&db_info
);
1550 set_return_assign_state(&db_info
);
1551 process_return_states(&db_info
);
1553 if (!db_info
.stree
&& db_info
.cull
) { /* this means we culled everything */
1554 set_extra_expr_mod(expr
->left
, alloc_estate_whole(get_type(expr
->left
)));
1555 set_path_impossible();
1557 FOR_EACH_SM(db_info
.stree
, sm
) {
1559 } END_FOR_EACH_SM(sm
);
1561 free_stree(&db_info
.stree
);
1563 if (!db_info
.states_merged
)
1564 mark_call_params_untracked(right
);
1566 call_return_states_after_hooks(right
);
1568 return db_info
.handled
;
1571 static bool handle_implied_return(struct expression
*expr
)
1573 struct range_list
*rl
;
1575 if (!get_implied_return(expr
->right
, &rl
))
1577 rl
= cast_rl(get_type(expr
->left
), rl
);
1578 set_extra_expr_mod(expr
->left
, alloc_estate_rl(rl
));
1582 static void match_assign_call(struct expression
*expr
)
1584 struct call_back_list
*call_backs
;
1585 const char *fn_name
;
1586 struct expression
*right
;
1588 struct range_list
*rl
;
1590 if (expr
->op
!= '=')
1593 right
= strip_expr(expr
->right
);
1594 if (is_fake_call(right
))
1597 fn_name
= get_fn_name(right
->fn
);
1598 call_backs
= get_call_backs(fn_name
);
1601 * The ordering here is sort of important.
1602 * One example, of how this matters is that when we do:
1604 * len = strlen(str);
1606 * That is handled by smatch_common_functions.c and smatch_strlen.c.
1607 * They use implied_return and function_assign_hook respectively.
1608 * We want to get the implied return first before we do the function
1609 * assignment hook otherwise we end up writing the wrong thing for len
1610 * in smatch_extra.c because we assume that it already holds the
1611 * strlen() when we haven't set it yet.
1614 if (db_return_states_assign(expr
))
1617 handled
= assign_ranged_funcs(fn_name
, expr
, call_backs
);
1618 handled
|= handle_implied_return(expr
);
1621 call_call_backs(call_backs
, ASSIGN_CALL
, fn_name
, expr
);
1626 /* assignment wasn't handled at all */
1627 get_absolute_rl(expr
->right
, &rl
);
1628 rl
= cast_rl(get_type(expr
->left
), rl
);
1629 set_extra_expr_mod(expr
->left
, alloc_estate_rl(rl
));
1632 static int db_return_states_callback(void *_info
, int argc
, char **argv
, char **azColName
)
1634 struct db_callback_info
*db_info
= _info
;
1635 struct range_list
*ret_range
;
1637 char *ret_str
, *key
, *value
;
1638 struct return_implies_callback
*tmp
;
1644 return_id
= atoi(argv
[0]);
1646 type
= atoi(argv
[2]);
1647 param
= atoi(argv
[3]);
1651 if (db_info
->prev_return_id
!= -1 && type
== INTERNAL
) {
1652 call_ranged_return_hooks(db_info
);
1653 process_return_states(db_info
);
1654 __push_fake_cur_stree();
1658 db_info
->prev_return_id
= return_id
;
1660 if (type
== INTERNAL
&& func_type_mismatch(db_info
->expr
, value
))
1664 if (type
== CULL_PATH
) {
1668 if (is_impossible_data(type
, db_info
, param
, key
, value
)) {
1673 if (type
== PARAM_LIMIT
)
1674 param_limit_implications(db_info
->expr
, param
, key
, value
, &db_info
->implied
);
1675 else if (type
> PARAM_LIMIT
)
1676 set_implied_states(db_info
);
1678 call_results_to_rl(db_info
->expr
, get_type(strip_expr(db_info
->expr
)), ret_str
, &ret_range
);
1679 ret_range
= cast_rl(get_type(db_info
->expr
), ret_range
);
1681 if (type
== INTERNAL
) {
1682 struct smatch_state
*state
;
1684 set_state(-1, "unnull_path", NULL
, &true_state
);
1685 call_string_hooks(return_string_hooks
, db_info
->expr
, ret_str
);
1686 state
= alloc_estate_rl(ret_range
);
1687 store_return_state(db_info
, ret_str
, state
);
1690 FOR_EACH_PTR(db_return_states_list
, tmp
) {
1691 if (tmp
->type
== type
)
1692 call_db_return_callback(db_info
, tmp
, param
, key
, value
);
1693 } END_FOR_EACH_PTR(tmp
);
1695 fake_return_assignment(db_info
, type
, param
, key
, value
);
1700 static void db_return_states(struct expression
*expr
)
1702 struct sm_state
*sm
;
1703 struct db_callback_info db_info
= {};
1705 if (!__get_cur_stree()) /* no return functions */
1708 db_info
.prev_return_id
= -1;
1709 db_info
.expr
= expr
;
1710 db_info
.stree
= NULL
;
1712 call_void_fns(return_states_before
);
1714 __push_fake_cur_stree();
1716 sql_select_return_states("return_id, return, type, parameter, key, value",
1717 expr
, db_return_states_callback
, &db_info
);
1718 call_ranged_return_hooks(&db_info
);
1719 process_return_states(&db_info
);
1721 FOR_EACH_SM(db_info
.stree
, sm
) {
1723 } END_FOR_EACH_SM(sm
);
1725 free_stree(&db_info
.stree
);
1727 if (!db_info
.states_merged
)
1728 mark_call_params_untracked(expr
);
1730 call_return_states_after_hooks(expr
);
1733 static void db_return_states_call(struct expression
*expr
)
1738 if (is_assigned_call(expr
) || is_fake_assigned_call(expr
))
1740 if (is_condition_call(expr
))
1742 db_return_states(expr
);
1745 static void match_function_call_early(struct expression
*expr
)
1747 call_function_hooks(expr
, REGULAR_CALL_EARLY
);
1750 static void match_function_call(struct expression
*expr
)
1752 call_function_hooks(expr
, REGULAR_CALL
);
1753 db_return_states_call(expr
);
1754 /* If we have no database there could be unprocessed fake calls */
1758 static void match_macro_assign(struct expression
*expr
)
1760 struct call_back_list
*call_backs
;
1762 struct expression
*right
;
1764 right
= strip_expr(expr
->right
);
1765 macro
= get_macro_name(right
->pos
);
1766 call_backs
= search_callback(func_hash
, (char *)macro
);
1769 call_call_backs(call_backs
, MACRO_ASSIGN
, macro
, expr
);
1770 call_call_backs(call_backs
, MACRO_ASSIGN_EXTRA
, macro
, expr
);
1773 bool get_implied_return(struct expression
*expr
, struct range_list
**rl
)
1775 struct call_back_list
*call_backs
;
1776 struct fcall_back
*tmp
;
1777 bool handled
= false;
1782 expr
= strip_expr(expr
);
1783 fn
= expr_to_var(expr
->fn
);
1787 call_backs
= search_callback(func_hash
, fn
);
1789 FOR_EACH_PTR(call_backs
, tmp
) {
1790 if (tmp
->type
== IMPLIED_RETURN
)
1791 handled
|= (tmp
->u
.implied_return
)(expr
, tmp
->info
, rl
);
1792 } END_FOR_EACH_PTR(tmp
);
1799 struct range_list
*get_range_implications(const char *fn
)
1801 struct call_back_list
*call_backs
;
1802 struct range_list
*ret
= NULL
;
1803 struct fcall_back
*tmp
;
1805 call_backs
= search_callback(func_hash
, (char *)fn
);
1807 FOR_EACH_PTR(call_backs
, tmp
) {
1808 if (tmp
->type
!= RANGED_CALL
&&
1809 tmp
->type
!= RANGED_EXACT
)
1811 add_ptr_list(&ret
, tmp
->range
);
1812 } END_FOR_EACH_PTR(tmp
);
1817 void create_function_hook_hash(void)
1819 func_hash
= create_function_hashtable(5000);
1822 void register_function_hooks_early(int id
)
1824 add_hook(&match_function_call_early
, FUNCTION_CALL_HOOK_BEFORE
);
1827 void register_function_hooks(int id
)
1829 add_function_data((unsigned long *)&fake_calls
);
1830 add_hook(&match_function_call
, CALL_HOOK_AFTER_INLINE
);
1831 add_hook(&match_assign_call
, CALL_ASSIGNMENT_HOOK
);
1832 add_hook(&match_macro_assign
, MACRO_ASSIGNMENT_HOOK
);