2 * sparse/smatch_extra.c
4 * Copyright (C) 2008 Dan Carpenter.
6 * Licensed under the Open Software License version 1.1
11 * smatch_extra.c is supposed to track the value of every variable.
21 #include "smatch_slist.h"
22 #include "smatch_extra.h"
26 static struct symbol
*cur_func
;
28 struct data_range whole_range
= {
33 static struct data_info
*alloc_dinfo(void)
35 struct data_info
*ret
;
37 ret
= __alloc_data_info(0);
39 ret
->type
= DATA_RANGE
;
40 ret
->value_ranges
= NULL
;
44 static struct data_info
*alloc_dinfo_range(long long min
, long long max
)
46 struct data_info
*ret
;
49 add_range(&ret
->value_ranges
, min
, max
);
53 static struct data_info
*alloc_dinfo_range_list(struct range_list
*rl
)
55 struct data_info
*ret
;
58 ret
->value_ranges
= rl
;
62 static struct data_info
*clone_dinfo(struct data_info
*dinfo
)
64 struct data_info
*ret
;
67 ret
->equiv
= clone_tracker_list(dinfo
->equiv
);
68 ret
->value_ranges
= clone_range_list(dinfo
->value_ranges
);
72 static struct smatch_state
*clone_extra_state(struct smatch_state
*state
)
74 struct smatch_state
*ret
;
76 ret
= __alloc_smatch_state(0);
77 ret
->name
= state
->name
;
78 ret
->data
= clone_dinfo(get_dinfo(state
));
82 static struct smatch_state
*alloc_extra_state_empty(void)
84 struct smatch_state
*state
;
85 struct data_info
*dinfo
;
87 dinfo
= alloc_dinfo();
88 state
= __alloc_smatch_state(0);
94 static struct smatch_state
*alloc_extra_state_no_name(int val
)
96 struct smatch_state
*state
;
98 state
= __alloc_smatch_state(0);
99 state
->data
= (void *)alloc_dinfo_range(val
, val
);
103 /* We do this because ->value_ranges is a list */
104 struct smatch_state
*extra_undefined(void)
106 struct data_info
*dinfo
;
107 static struct smatch_state
*ret
;
108 static struct symbol
*prev_func
;
110 if (prev_func
== cur_func
)
112 prev_func
= cur_func
;
114 dinfo
= alloc_dinfo_range(whole_range
.min
, whole_range
.max
);
115 ret
= __alloc_smatch_state(0);
116 ret
->name
= "unknown";
121 struct smatch_state
*alloc_extra_state(long long val
)
123 struct smatch_state
*state
;
125 state
= alloc_extra_state_no_name(val
);
126 state
->name
= show_ranges(get_dinfo(state
)->value_ranges
);
130 struct smatch_state
*alloc_extra_state_range(long long min
, long long max
)
132 struct smatch_state
*state
;
134 if (min
== whole_range
.min
&& max
== whole_range
.max
)
135 return extra_undefined();
136 state
= __alloc_smatch_state(0);
137 state
->data
= (void *)alloc_dinfo_range(min
, max
);
138 state
->name
= show_ranges(get_dinfo(state
)->value_ranges
);
142 struct smatch_state
*alloc_extra_state_range_list(struct range_list
*rl
)
144 struct smatch_state
*state
;
146 state
= __alloc_smatch_state(0);
147 state
->data
= (void *)alloc_dinfo_range_list(rl
);
148 state
->name
= show_ranges(get_dinfo(state
)->value_ranges
);
152 static void add_equiv(struct smatch_state
*state
, const char *name
, struct symbol
*sym
)
154 struct data_info
*dinfo
;
156 dinfo
= get_dinfo(state
);
157 add_tracker(&dinfo
->equiv
, SMATCH_EXTRA
, name
, sym
);
160 static void del_equiv(struct smatch_state
*state
, const char *name
, struct symbol
*sym
)
162 struct data_info
*dinfo
;
164 dinfo
= get_dinfo(state
);
165 del_tracker(&dinfo
->equiv
, SMATCH_EXTRA
, name
, sym
);
168 static void remove_from_equiv(const char *name
, struct symbol
*sym
)
170 struct sm_state
*orig_sm
;
171 struct tracker
*tracker
;
172 struct smatch_state
*state
;
174 orig_sm
= get_sm_state(SMATCH_EXTRA
, name
, sym
);
175 if (!orig_sm
|| !get_dinfo(orig_sm
->state
)->equiv
)
178 state
= clone_extra_state(orig_sm
->state
);
179 del_equiv(state
, name
, sym
);
181 FOR_EACH_PTR(get_dinfo(orig_sm
->state
)->equiv
, tracker
) {
182 struct sm_state
*new_sm
;
184 new_sm
= clone_sm(orig_sm
);
185 new_sm
->name
= tracker
->name
;
186 new_sm
->sym
= tracker
->sym
;
187 new_sm
->state
= state
;
189 } END_FOR_EACH_PTR(tracker
);
192 static void remove_from_equiv_expr(struct expression
*expr
)
197 name
= get_variable_from_expr(expr
, &sym
);
200 remove_from_equiv(name
, sym
);
205 struct sm_state
*set_extra_mod(const char *name
, struct symbol
*sym
, struct smatch_state
*state
)
207 remove_from_equiv(name
, sym
);
208 return set_state(SMATCH_EXTRA
, name
, sym
, state
);
211 struct sm_state
*set_extra_expr_mod(struct expression
*expr
, struct smatch_state
*state
)
213 remove_from_equiv_expr(expr
);
214 return set_state_expr(SMATCH_EXTRA
, expr
, state
);
217 void set_extra_true_false(const char *name
, struct symbol
*sym
,
218 struct smatch_state
*true_state
,
219 struct smatch_state
*false_state
)
221 struct tracker
*tracker
;
222 struct smatch_state
*orig_state
;
224 orig_state
= get_state(SMATCH_EXTRA
, name
, sym
);
226 if (!orig_state
|| !get_dinfo(orig_state
)->equiv
) {
227 set_true_false_states(SMATCH_EXTRA
, name
, sym
, true_state
, false_state
);
231 FOR_EACH_PTR(get_dinfo(orig_state
)->equiv
, tracker
) {
232 set_true_false_states(tracker
->owner
, tracker
->name
, tracker
->sym
,
233 true_state
, false_state
);
235 add_equiv(true_state
, tracker
->name
, tracker
->sym
);
237 add_equiv(false_state
, tracker
->name
, tracker
->sym
);
238 } END_FOR_EACH_PTR(tracker
);
241 struct data_info
*get_dinfo(struct smatch_state
*state
)
245 return (struct data_info
*)state
->data
;
249 struct smatch_state
*filter_range(struct smatch_state
*orig
,
250 long long filter_min
, long long filter_max
)
252 struct smatch_state
*ret
;
253 struct data_info
*orig_info
;
254 struct data_info
*ret_info
;
257 orig
= extra_undefined();
258 orig_info
= get_dinfo(orig
);
259 ret
= alloc_extra_state_empty();
260 ret_info
= get_dinfo(ret
);
261 ret_info
->value_ranges
= remove_range(orig_info
->value_ranges
, filter_min
, filter_max
);
262 ret
->name
= show_ranges(ret_info
->value_ranges
);
266 struct smatch_state
*add_filter(struct smatch_state
*orig
, long long num
)
268 return filter_range(orig
, num
, num
);
271 static struct smatch_state
*merge_func(const char *name
, struct symbol
*sym
,
272 struct smatch_state
*s1
,
273 struct smatch_state
*s2
)
275 struct data_info
*info1
= get_dinfo(s1
);
276 struct data_info
*info2
= get_dinfo(s2
);
277 struct data_info
*ret_info
;
278 struct smatch_state
*tmp
;
279 struct range_list
*value_ranges
;
280 struct tracker
*tracker
;
282 value_ranges
= range_list_union(info1
->value_ranges
, info2
->value_ranges
);
283 tmp
= alloc_extra_state_empty();
284 ret_info
= get_dinfo(tmp
);
285 ret_info
->value_ranges
= value_ranges
;
286 tmp
->name
= show_ranges(ret_info
->value_ranges
);
287 FOR_EACH_PTR(info1
->equiv
, tracker
) {
288 if (in_tracker_list(info2
->equiv
, tracker
->owner
, tracker
->name
, tracker
->sym
))
289 add_equiv(tmp
, tracker
->name
, tracker
->sym
);
290 } END_FOR_EACH_PTR(tracker
);
294 static struct sm_state
*handle_canonical_while_count_down(struct statement
*loop
)
296 struct expression
*iter_var
;
297 struct expression
*condition
;
301 condition
= strip_expr(loop
->iterator_pre_condition
);
304 if (condition
->type
!= EXPR_PREOP
&& condition
->type
!= EXPR_POSTOP
)
306 if (condition
->op
!= SPECIAL_DECREMENT
)
309 iter_var
= condition
->unop
;
310 sm
= get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
313 if (get_dinfo_min(get_dinfo(sm
->state
)) < 0)
315 start
= get_dinfo_max(get_dinfo(sm
->state
));
318 if (start
!= whole_range
.max
)
321 if (condition
->type
== EXPR_PREOP
)
322 set_extra_expr_mod(iter_var
, alloc_extra_state_range(1, start
));
323 if (condition
->type
== EXPR_POSTOP
)
324 set_extra_expr_mod(iter_var
, alloc_extra_state_range(0, start
));
325 return get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
328 static struct sm_state
*handle_canonical_for_loops(struct statement
*loop
)
330 struct expression
*iter_expr
;
331 struct expression
*iter_var
;
332 struct expression
*condition
;
337 if (!loop
->iterator_post_statement
)
339 if (loop
->iterator_post_statement
->type
!= STMT_EXPRESSION
)
341 iter_expr
= loop
->iterator_post_statement
->expression
;
342 if (!loop
->iterator_pre_condition
)
344 if (loop
->iterator_pre_condition
->type
!= EXPR_COMPARE
)
346 condition
= loop
->iterator_pre_condition
;
349 if (iter_expr
->op
!= SPECIAL_INCREMENT
)
351 iter_var
= iter_expr
->unop
;
352 sm
= get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
355 if (!get_single_value_from_dinfo(get_dinfo(sm
->state
), &start
))
357 if (!get_implied_value(condition
->right
, &end
))
358 end
= whole_range
.max
;
359 if (get_sm_state_expr(SMATCH_EXTRA
, condition
->left
) != sm
)
362 switch (condition
->op
) {
363 case SPECIAL_NOTEQUAL
:
365 if (end
!= whole_range
.max
)
375 set_extra_expr_mod(iter_var
, alloc_extra_state_range(start
, end
));
376 return get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
379 struct sm_state
*__extra_handle_canonical_loops(struct statement
*loop
, struct state_list
**slist
)
381 struct sm_state
*ret
;
384 if (!loop
->iterator_post_statement
)
385 ret
= handle_canonical_while_count_down(loop
);
387 ret
= handle_canonical_for_loops(loop
);
388 *slist
= __fake_cur_slist
;
389 __fake_cur_slist
= NULL
;
394 int __iterator_unchanged(struct sm_state
*sm
)
398 if (get_sm_state(my_id
, sm
->name
, sm
->sym
) == sm
)
403 static void while_count_down_after(struct sm_state
*sm
, struct expression
*condition
)
405 long long after_value
;
407 /* paranoid checking. prolly not needed */
408 condition
= strip_expr(condition
);
411 if (condition
->type
!= EXPR_PREOP
&& condition
->type
!= EXPR_POSTOP
)
413 if (condition
->op
!= SPECIAL_DECREMENT
)
415 after_value
= get_dinfo_min(get_dinfo(sm
->state
));
417 set_extra_mod(sm
->name
, sm
->sym
, alloc_extra_state(after_value
));
420 void __extra_pre_loop_hook_after(struct sm_state
*sm
,
421 struct statement
*iterator
,
422 struct expression
*condition
)
424 struct expression
*iter_expr
;
429 struct smatch_state
*state
;
430 struct data_info
*dinfo
;
434 while_count_down_after(sm
, condition
);
438 iter_expr
= iterator
->expression
;
440 if (condition
->type
!= EXPR_COMPARE
)
442 if (!get_value(condition
->left
, &value
)) {
443 if (!get_value(condition
->right
, &value
))
448 name
= get_variable_from_expr(condition
->left
, &sym
);
450 name
= get_variable_from_expr(condition
->right
, &sym
);
453 if (sym
!= sm
->sym
|| strcmp(name
, sm
->name
))
455 state
= get_state(my_id
, name
, sym
);
456 dinfo
= get_dinfo(state
);
457 min
= get_dinfo_min(dinfo
);
458 max
= get_dinfo_max(dinfo
);
459 if (iter_expr
->op
== SPECIAL_INCREMENT
&& min
!= whole_range
.min
&& max
== whole_range
.max
) {
460 set_extra_mod(name
, sym
, alloc_extra_state(min
));
461 } else if (min
== whole_range
.min
&& max
!= whole_range
.max
) {
462 set_extra_mod(name
, sym
, alloc_extra_state(max
));
469 static struct smatch_state
*unmatched_state(struct sm_state
*sm
)
471 return extra_undefined();
474 static void match_function_call(struct expression
*expr
)
476 struct expression
*tmp
;
481 FOR_EACH_PTR(expr
->args
, tmp
) {
482 if (tmp
->type
== EXPR_PREOP
&& tmp
->op
== '&') {
483 name
= get_variable_from_expr(tmp
->unop
, &sym
);
485 set_extra_mod(name
, sym
, extra_undefined());
490 } END_FOR_EACH_PTR(tmp
);
493 static void set_equiv(struct sm_state
*right_sm
, struct expression
*left
)
495 struct smatch_state
*state
;
496 struct data_info
*dinfo
;
497 struct tracker
*tracker
;
501 name
= get_variable_from_expr(left
, &sym
);
505 state
= clone_extra_state(right_sm
->state
);
507 dinfo
= get_dinfo(state
);
509 add_equiv(state
, right_sm
->name
, right_sm
->sym
);
510 add_equiv(state
, name
, sym
);
512 FOR_EACH_PTR(dinfo
->equiv
, tracker
) {
513 struct sm_state
*new_sm
;
515 new_sm
= clone_sm(right_sm
);
516 new_sm
->name
= tracker
->name
;
517 new_sm
->sym
= tracker
->sym
;
518 new_sm
->state
= state
;
520 } END_FOR_EACH_PTR(tracker
);
525 static void match_assign(struct expression
*expr
)
527 struct expression
*left
;
528 struct expression
*right
;
529 struct sm_state
*right_sm
;
534 long long min
= whole_range
.min
;
535 long long max
= whole_range
.max
;
537 struct range_list
*rl
= NULL
;
539 left
= strip_expr(expr
->left
);
540 name
= get_variable_from_expr(left
, &sym
);
543 right
= strip_expr(expr
->right
);
544 while (right
->type
== EXPR_ASSIGNMENT
&& right
->op
== '=')
545 right
= strip_expr(right
->left
);
547 right_sm
= get_sm_state_expr(SMATCH_EXTRA
, right
);
548 if (expr
->op
== '=' && right_sm
) {
549 set_equiv(right_sm
, left
);
553 known
= get_implied_range_list(right
, &rl
);
554 if (expr
->op
== '=') {
556 set_extra_mod(name
, sym
, alloc_extra_state_range_list(rl
));
558 set_extra_mod(name
, sym
, extra_undefined());
562 known
= get_implied_value(right
, &value
);
563 if (expr
->op
== SPECIAL_ADD_ASSIGN
) {
564 if (get_implied_min(left
, &tmp
)) {
572 if (expr
->op
== SPECIAL_SUB_ASSIGN
) {
573 if (get_implied_max(left
, &tmp
)) {
581 set_extra_mod(name
, sym
, alloc_extra_state_range(min
, max
));
586 static void unop_expr(struct expression
*expr
)
590 long long min
= whole_range
.min
;
591 long long max
= whole_range
.max
;
601 name
= get_variable_from_expr(expr
->unop
, &sym
);
604 if (expr
->op
== SPECIAL_INCREMENT
) {
605 if (get_implied_min(expr
->unop
, &val
))
608 if (expr
->op
== SPECIAL_DECREMENT
) {
609 if (get_implied_max(expr
->unop
, &val
))
612 set_extra_mod(name
, sym
, alloc_extra_state_range(min
, max
));
617 static void delete_state_tracker(struct tracker
*t
)
619 remove_from_equiv(t
->name
, t
->sym
);
620 delete_state(t
->owner
, t
->name
, t
->sym
);
623 static void scoped_state_extra(const char *name
, struct symbol
*sym
)
627 t
= alloc_tracker(SMATCH_EXTRA
, name
, sym
);
628 add_scope_hook((scope_hook
*)&delete_state_tracker
, t
);
631 static void match_declarations(struct symbol
*sym
)
637 name
= sym
->ident
->name
;
638 if (sym
->initializer
) {
639 if (get_value(sym
->initializer
, &val
))
640 set_state(SMATCH_EXTRA
, name
, sym
, alloc_extra_state(val
));
642 set_state(SMATCH_EXTRA
, name
, sym
, extra_undefined());
643 scoped_state_extra(name
, sym
);
645 set_state(SMATCH_EXTRA
, name
, sym
, extra_undefined());
646 scoped_state_extra(name
, sym
);
651 static void match_function_def(struct symbol
*sym
)
656 FOR_EACH_PTR(sym
->ctype
.base_type
->arguments
, arg
) {
660 set_state(my_id
, arg
->ident
->name
, arg
, extra_undefined());
661 } END_FOR_EACH_PTR(arg
);
664 static int last_stmt_val(struct statement
*stmt
, long long *val
)
666 struct expression
*expr
;
671 stmt
= last_ptr_list((struct ptr_list
*)stmt
->stmts
);
672 if (stmt
->type
!= STMT_EXPRESSION
)
674 expr
= stmt
->expression
;
675 return get_value(expr
, val
);
678 static void match_comparison(struct expression
*expr
)
683 struct smatch_state
*true_state
;
684 struct smatch_state
*false_state
;
685 struct smatch_state
*orig
;
687 int comparison
= expr
->op
;
688 struct expression
*varies
= expr
->right
;
690 if (!get_value(expr
->left
, &fixed
)) {
691 if (!get_value(expr
->right
, &fixed
))
693 varies
= strip_expr(expr
->left
);
696 if (varies
->op
== SPECIAL_INCREMENT
|| varies
->op
== SPECIAL_DECREMENT
)
697 varies
= varies
->unop
;
698 if (varies
->type
== EXPR_CALL
) {
699 function_comparison(comparison
, varies
, fixed
, left
);
703 name
= get_variable_from_expr(varies
, &sym
);
707 orig
= get_state(my_id
, name
, sym
);
709 orig
= extra_undefined();
711 switch (comparison
) {
713 case SPECIAL_UNSIGNED_LT
:
715 true_state
= filter_range(orig
, fixed
, whole_range
.max
);
716 false_state
= filter_range(orig
, whole_range
.min
, fixed
- 1);
718 true_state
= filter_range(orig
, whole_range
.min
, fixed
);
719 false_state
= filter_range(orig
, fixed
+ 1, whole_range
.max
);
722 case SPECIAL_UNSIGNED_LTE
:
725 true_state
= filter_range(orig
, fixed
+ 1, whole_range
.max
);
726 false_state
= filter_range(orig
, whole_range
.min
, fixed
);
728 true_state
= filter_range(orig
, whole_range
.min
, fixed
- 1);
729 false_state
= filter_range(orig
, fixed
, whole_range
.max
);
733 if (possibly_true(SPECIAL_EQUAL
, get_dinfo(orig
), fixed
, fixed
))
734 true_state
= alloc_extra_state(fixed
);
736 true_state
= alloc_extra_state_empty();
737 false_state
= filter_range(orig
, fixed
, fixed
);
739 case SPECIAL_UNSIGNED_GTE
:
742 true_state
= filter_range(orig
, whole_range
.min
, fixed
- 1);
743 false_state
= filter_range(orig
, fixed
, whole_range
.max
);
745 true_state
= filter_range(orig
, fixed
+ 1, whole_range
.max
);
746 false_state
= filter_range(orig
, whole_range
.min
, fixed
);
750 case SPECIAL_UNSIGNED_GT
:
752 true_state
= filter_range(orig
, whole_range
.min
, fixed
);
753 false_state
= filter_range(orig
, fixed
+ 1, whole_range
.max
);
755 true_state
= filter_range(orig
, fixed
, whole_range
.max
);
756 false_state
= filter_range(orig
, whole_range
.min
, fixed
- 1);
759 case SPECIAL_NOTEQUAL
:
760 true_state
= filter_range(orig
, fixed
, fixed
);
761 if (possibly_true(SPECIAL_EQUAL
, get_dinfo(orig
), fixed
, fixed
))
762 false_state
= alloc_extra_state(fixed
);
764 false_state
= alloc_extra_state_empty();
767 sm_msg("unhandled comparison %d\n", comparison
);
770 set_extra_true_false(name
, sym
, true_state
, false_state
);
775 /* this is actually hooked from smatch_implied.c... it's hacky, yes */
776 void __extra_match_condition(struct expression
*expr
)
780 struct smatch_state
*pre_state
;
781 struct smatch_state
*true_state
;
782 struct smatch_state
*false_state
;
784 expr
= strip_expr(expr
);
785 switch (expr
->type
) {
787 function_comparison(SPECIAL_NOTEQUAL
, expr
, 0, 1);
792 name
= get_variable_from_expr(expr
, &sym
);
795 pre_state
= get_state(my_id
, name
, sym
);
796 true_state
= add_filter(pre_state
, 0);
797 if (possibly_true(SPECIAL_EQUAL
, get_dinfo(pre_state
), 0, 0))
798 false_state
= alloc_extra_state(0);
800 false_state
= alloc_extra_state_empty();
801 set_extra_true_false(name
, sym
, true_state
, false_state
);
805 match_comparison(expr
);
807 case EXPR_ASSIGNMENT
:
808 __extra_match_condition(expr
->left
);
813 /* returns 1 if it is not possible for expr to be value, otherwise returns 0 */
814 int implied_not_equal(struct expression
*expr
, long long val
)
818 struct smatch_state
*state
;
821 name
= get_variable_from_expr(expr
, &sym
);
824 state
= get_state(my_id
, name
, sym
);
825 if (!state
|| !state
->data
)
827 ret
= !possibly_false(SPECIAL_NOTEQUAL
, get_dinfo(state
), val
, 1);
833 int known_condition_true(struct expression
*expr
)
840 if (get_value(expr
, &tmp
) && tmp
)
843 expr
= strip_expr(expr
);
844 switch (expr
->type
) {
846 if (expr
->op
== '!') {
847 if (known_condition_false(expr
->unop
))
858 int known_condition_false(struct expression
*expr
)
866 switch (expr
->type
) {
868 if (expr
->op
== '!') {
869 if (known_condition_true(expr
->unop
))
880 static int do_comparison_range(struct expression
*expr
)
884 struct smatch_state
*state
;
887 int poss_true
, poss_false
;
889 if (!get_value(expr
->left
, &value
)) {
890 if (!get_value(expr
->right
, &value
))
895 name
= get_variable_from_expr(expr
->left
, &sym
);
897 name
= get_variable_from_expr(expr
->right
, &sym
);
900 state
= get_state(SMATCH_EXTRA
, name
, sym
);
903 poss_true
= possibly_true(expr
->op
, get_dinfo(state
), value
, left
);
904 poss_false
= possibly_false(expr
->op
, get_dinfo(state
), value
, left
);
905 if (!poss_true
&& !poss_false
)
907 if (poss_true
&& !poss_false
)
909 if (!poss_true
&& poss_false
)
911 if (poss_true
&& poss_false
)
918 int implied_condition_true(struct expression
*expr
)
920 struct statement
*stmt
;
927 if (get_implied_value(expr
, &tmp
) && tmp
)
930 if (expr
->type
== EXPR_POSTOP
)
931 return implied_condition_true(expr
->unop
);
933 if (expr
->type
== EXPR_PREOP
&& expr
->op
== SPECIAL_DECREMENT
)
934 return implied_not_equal(expr
->unop
, 1);
935 if (expr
->type
== EXPR_PREOP
&& expr
->op
== SPECIAL_INCREMENT
)
936 return implied_not_equal(expr
->unop
, -1);
938 expr
= strip_expr(expr
);
939 switch (expr
->type
) {
941 if (do_comparison_range(expr
) == 1)
945 if (expr
->op
== '!') {
946 if (implied_condition_false(expr
->unop
))
950 stmt
= get_block_thing(expr
);
951 if (last_stmt_val(stmt
, &val
) && val
== 1)
955 if (implied_not_equal(expr
, 0) == 1)
962 int implied_condition_false(struct expression
*expr
)
964 struct statement
*stmt
;
965 struct expression
*tmp
;
974 switch (expr
->type
) {
976 if (do_comparison_range(expr
) == 2)
979 if (expr
->op
== '!') {
980 if (implied_condition_true(expr
->unop
))
984 stmt
= get_block_thing(expr
);
985 if (last_stmt_val(stmt
, &val
) && val
== 0)
987 tmp
= strip_expr(expr
);
989 return implied_condition_false(tmp
);
992 if (get_implied_value(expr
, &val
) && val
== 0)
999 int get_implied_range_list(struct expression
*expr
, struct range_list
**rl
)
1002 struct smatch_state
*state
;
1004 expr
= strip_expr(expr
);
1006 state
= get_state_expr(my_id
, expr
);
1008 *rl
= clone_range_list(get_dinfo(state
)->value_ranges
);
1012 if (get_implied_value(expr
, &val
)) {
1014 add_range(rl
, val
, val
);
1018 if (expr
->type
== EXPR_BINOP
&& expr
->op
== '%') {
1019 if (!get_implied_value(expr
->right
, &val
))
1022 add_range(rl
, 0, val
- 1);
1029 int is_whole_range(struct smatch_state
*state
)
1031 struct data_info
*dinfo
;
1032 struct data_range
*drange
;
1036 dinfo
= get_dinfo(state
);
1037 drange
= first_ptr_list((struct ptr_list
*)dinfo
->value_ranges
);
1038 if (drange
->min
== whole_range
.min
&& drange
->max
== whole_range
.max
)
1043 void register_smatch_extra(int id
)
1046 add_merge_hook(my_id
, &merge_func
);
1047 add_unmatched_state_hook(my_id
, &unmatched_state
);
1048 add_hook(&unop_expr
, OP_HOOK
);
1049 add_hook(&match_function_def
, FUNC_DEF_HOOK
);
1050 add_hook(&match_function_call
, FUNCTION_CALL_HOOK
);
1051 add_hook(&match_assign
, ASSIGNMENT_HOOK
);
1052 add_hook(&match_declarations
, DECLARATION_HOOK
);