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
->related
= clone_related_list(dinfo
->related
);
68 ret
->value_ranges
= clone_range_list(dinfo
->value_ranges
);
72 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 struct string_list
*__ignored_macros
= NULL
;
153 static int in_warn_on_macro()
155 struct statement
*stmt
;
159 stmt
= last_ptr_list((struct ptr_list
*)big_statement_stack
);
160 macro
= get_macro_name(&stmt
->pos
);
164 FOR_EACH_PTR(__ignored_macros
, tmp
) {
165 if (!strcmp(tmp
, macro
))
167 } END_FOR_EACH_PTR(tmp
);
171 struct sm_state
*set_extra_mod(const char *name
, struct symbol
*sym
, struct smatch_state
*state
)
173 if (in_warn_on_macro())
175 remove_from_equiv(name
, sym
);
176 return set_state(SMATCH_EXTRA
, name
, sym
, state
);
179 struct sm_state
*set_extra_expr_mod(struct expression
*expr
, struct smatch_state
*state
)
181 if (in_warn_on_macro())
183 remove_from_equiv_expr(expr
);
184 return set_state_expr(SMATCH_EXTRA
, expr
, state
);
188 * This is for return_implies_state() hooks which modify a SMATCH_EXTRA state
190 void set_extra_expr_nomod(struct expression
*expr
, struct smatch_state
*state
)
192 struct relation
*rel
;
193 struct smatch_state
*orig_state
;
195 orig_state
= get_state_expr(SMATCH_EXTRA
, expr
);
197 if (!orig_state
|| !get_dinfo(orig_state
)->related
) {
198 set_state_expr(SMATCH_EXTRA
, expr
, state
);
202 FOR_EACH_PTR(get_dinfo(orig_state
)->related
, rel
) {
203 sm_msg("setting %s to %s", rel
->name
, state
->name
);
204 set_state(SMATCH_EXTRA
, rel
->name
, rel
->sym
, state
);
205 add_equiv(state
, rel
->name
, rel
->sym
);
206 } END_FOR_EACH_PTR(rel
);
209 void set_extra_true_false(const char *name
, struct symbol
*sym
,
210 struct smatch_state
*true_state
,
211 struct smatch_state
*false_state
)
213 struct relation
*rel
;
214 struct smatch_state
*orig_state
;
216 if (in_warn_on_macro())
219 orig_state
= get_state(SMATCH_EXTRA
, name
, sym
);
221 if (!orig_state
|| !get_dinfo(orig_state
)->related
) {
222 set_true_false_states(SMATCH_EXTRA
, name
, sym
, true_state
, false_state
);
226 // FIXME!!!! equiv => related
227 FOR_EACH_PTR(get_dinfo(orig_state
)->related
, rel
) {
228 set_true_false_states(SMATCH_EXTRA
, rel
->name
, rel
->sym
,
229 true_state
, false_state
);
231 add_equiv(true_state
, rel
->name
, rel
->sym
);
233 add_equiv(false_state
, rel
->name
, rel
->sym
);
234 } END_FOR_EACH_PTR(rel
);
237 struct data_info
*get_dinfo(struct smatch_state
*state
)
241 return (struct data_info
*)state
->data
;
245 struct smatch_state
*filter_range(struct smatch_state
*orig
,
246 long long filter_min
, long long filter_max
)
248 struct smatch_state
*ret
;
249 struct data_info
*orig_info
;
250 struct data_info
*ret_info
;
253 orig
= extra_undefined();
254 orig_info
= get_dinfo(orig
);
255 ret
= alloc_extra_state_empty();
256 ret_info
= get_dinfo(ret
);
257 ret_info
->value_ranges
= remove_range(orig_info
->value_ranges
, filter_min
, filter_max
);
258 ret
->name
= show_ranges(ret_info
->value_ranges
);
262 struct smatch_state
*add_filter(struct smatch_state
*orig
, long long num
)
264 return filter_range(orig
, num
, num
);
267 static struct smatch_state
*merge_func(const char *name
, struct symbol
*sym
,
268 struct smatch_state
*s1
,
269 struct smatch_state
*s2
)
271 struct data_info
*info1
= get_dinfo(s1
);
272 struct data_info
*info2
= get_dinfo(s2
);
273 struct data_info
*ret_info
;
274 struct smatch_state
*tmp
;
275 struct range_list
*value_ranges
;
276 struct relation
*rel
;
277 struct relation
*new;
279 value_ranges
= range_list_union(info1
->value_ranges
, info2
->value_ranges
);
280 tmp
= alloc_extra_state_empty();
281 ret_info
= get_dinfo(tmp
);
282 ret_info
->value_ranges
= value_ranges
;
283 tmp
->name
= show_ranges(ret_info
->value_ranges
);
284 FOR_EACH_PTR(info1
->related
, rel
) {
285 new = get_common_relationship(info2
, rel
->op
, rel
->name
, rel
->sym
);
287 add_related(tmp
, new->op
, new->name
, new->sym
);
288 } END_FOR_EACH_PTR(rel
);
292 static struct sm_state
*handle_canonical_while_count_down(struct statement
*loop
)
294 struct expression
*iter_var
;
295 struct expression
*condition
;
299 condition
= strip_expr(loop
->iterator_pre_condition
);
302 if (condition
->type
!= EXPR_PREOP
&& condition
->type
!= EXPR_POSTOP
)
304 if (condition
->op
!= SPECIAL_DECREMENT
)
307 iter_var
= condition
->unop
;
308 sm
= get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
311 if (get_dinfo_min(get_dinfo(sm
->state
)) < 0)
313 start
= get_dinfo_max(get_dinfo(sm
->state
));
316 if (start
!= whole_range
.max
)
319 if (condition
->type
== EXPR_PREOP
)
320 set_extra_expr_mod(iter_var
, alloc_extra_state_range(1, start
));
321 if (condition
->type
== EXPR_POSTOP
)
322 set_extra_expr_mod(iter_var
, alloc_extra_state_range(0, start
));
323 return get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
326 static struct sm_state
*handle_canonical_for_loops(struct statement
*loop
)
328 struct expression
*iter_expr
;
329 struct expression
*iter_var
;
330 struct expression
*condition
;
335 if (!loop
->iterator_post_statement
)
337 if (loop
->iterator_post_statement
->type
!= STMT_EXPRESSION
)
339 iter_expr
= loop
->iterator_post_statement
->expression
;
340 if (!loop
->iterator_pre_condition
)
342 if (loop
->iterator_pre_condition
->type
!= EXPR_COMPARE
)
344 condition
= loop
->iterator_pre_condition
;
347 if (iter_expr
->op
!= SPECIAL_INCREMENT
)
349 iter_var
= iter_expr
->unop
;
350 sm
= get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
353 if (!get_single_value_from_dinfo(get_dinfo(sm
->state
), &start
))
355 if (!get_implied_value(condition
->right
, &end
))
356 end
= whole_range
.max
;
357 if (get_sm_state_expr(SMATCH_EXTRA
, condition
->left
) != sm
)
360 switch (condition
->op
) {
361 case SPECIAL_NOTEQUAL
:
363 if (end
!= whole_range
.max
)
373 set_extra_expr_mod(iter_var
, alloc_extra_state_range(start
, end
));
374 return get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
377 struct sm_state
*__extra_handle_canonical_loops(struct statement
*loop
, struct state_list
**slist
)
379 struct sm_state
*ret
;
381 __push_fake_cur_slist();;
382 if (!loop
->iterator_post_statement
)
383 ret
= handle_canonical_while_count_down(loop
);
385 ret
= handle_canonical_for_loops(loop
);
386 *slist
= __pop_fake_cur_slist();
390 int __iterator_unchanged(struct sm_state
*sm
)
394 if (get_sm_state(my_id
, sm
->name
, sm
->sym
) == sm
)
399 static void while_count_down_after(struct sm_state
*sm
, struct expression
*condition
)
401 long long after_value
;
403 /* paranoid checking. prolly not needed */
404 condition
= strip_expr(condition
);
407 if (condition
->type
!= EXPR_PREOP
&& condition
->type
!= EXPR_POSTOP
)
409 if (condition
->op
!= SPECIAL_DECREMENT
)
411 after_value
= get_dinfo_min(get_dinfo(sm
->state
));
413 set_extra_mod(sm
->name
, sm
->sym
, alloc_extra_state(after_value
));
416 void __extra_pre_loop_hook_after(struct sm_state
*sm
,
417 struct statement
*iterator
,
418 struct expression
*condition
)
420 struct expression
*iter_expr
;
425 struct smatch_state
*state
;
426 struct data_info
*dinfo
;
430 while_count_down_after(sm
, condition
);
434 iter_expr
= iterator
->expression
;
436 if (condition
->type
!= EXPR_COMPARE
)
438 if (!get_value(condition
->left
, &value
)) {
439 if (!get_value(condition
->right
, &value
))
444 name
= get_variable_from_expr(condition
->left
, &sym
);
446 name
= get_variable_from_expr(condition
->right
, &sym
);
449 if (sym
!= sm
->sym
|| strcmp(name
, sm
->name
))
451 state
= get_state(my_id
, name
, sym
);
452 dinfo
= get_dinfo(state
);
453 min
= get_dinfo_min(dinfo
);
454 max
= get_dinfo_max(dinfo
);
455 if (iter_expr
->op
== SPECIAL_INCREMENT
&& min
!= whole_range
.min
&& max
== whole_range
.max
) {
456 set_extra_mod(name
, sym
, alloc_extra_state(min
));
457 } else if (min
== whole_range
.min
&& max
!= whole_range
.max
) {
458 set_extra_mod(name
, sym
, alloc_extra_state(max
));
465 static struct smatch_state
*unmatched_state(struct sm_state
*sm
)
467 return extra_undefined();
470 static void match_function_call(struct expression
*expr
)
472 struct expression
*tmp
;
474 FOR_EACH_PTR(expr
->args
, tmp
) {
475 if (tmp
->type
== EXPR_PREOP
&& tmp
->op
== '&') {
476 remove_from_equiv_expr(tmp
->unop
);
477 set_state_expr(SMATCH_EXTRA
, tmp
->unop
, extra_undefined());
479 } END_FOR_EACH_PTR(tmp
);
482 static void set_equiv(struct sm_state
*right_sm
, struct expression
*left
)
484 struct smatch_state
*state
;
485 struct data_info
*dinfo
;
486 struct relation
*rel
;
490 name
= get_variable_from_expr(left
, &sym
);
494 remove_from_equiv(name
, sym
);
496 state
= clone_extra_state(right_sm
->state
);
497 dinfo
= get_dinfo(state
);
499 add_equiv(state
, right_sm
->name
, right_sm
->sym
);
500 add_equiv(state
, name
, sym
);
502 FOR_EACH_PTR(dinfo
->related
, rel
) {
503 struct sm_state
*new_sm
;
505 new_sm
= clone_sm(right_sm
);
506 new_sm
->name
= rel
->name
;
507 new_sm
->sym
= rel
->sym
;
508 new_sm
->state
= state
;
510 } END_FOR_EACH_PTR(rel
);
515 static void match_assign(struct expression
*expr
)
517 struct expression
*left
;
518 struct expression
*right
;
519 struct sm_state
*right_sm
;
524 long long min
= whole_range
.min
;
525 long long max
= whole_range
.max
;
528 left
= strip_expr(expr
->left
);
529 name
= get_variable_from_expr(left
, &sym
);
532 right
= strip_expr(expr
->right
);
533 while (right
->type
== EXPR_ASSIGNMENT
&& right
->op
== '=')
534 right
= strip_expr(right
->left
);
536 right_sm
= get_sm_state_expr(SMATCH_EXTRA
, right
);
537 if (expr
->op
== '=' && right_sm
) {
538 set_equiv(right_sm
, left
);
542 if (expr
->op
== '=') {
543 struct range_list
*rl
= NULL
;
545 if (get_implied_range_list(right
, &rl
)) {
546 set_extra_mod(name
, sym
, alloc_extra_state_range_list(rl
));
548 struct symbol
*type
= get_type(right
);
550 if (type
&& type_unsigned(type
))
552 set_extra_mod(name
, sym
, alloc_extra_state_range(min
, max
));
557 known
= get_implied_value(right
, &value
);
558 if (expr
->op
== SPECIAL_ADD_ASSIGN
) {
559 if (get_implied_min(left
, &tmp
)) {
565 if (!inside_loop() && known
&& get_implied_max(left
, &tmp
))
568 if (expr
->op
== SPECIAL_SUB_ASSIGN
) {
569 if (get_implied_max(left
, &tmp
)) {
575 if (!inside_loop() && known
&& get_implied_min(left
, &tmp
))
578 set_extra_mod(name
, sym
, alloc_extra_state_range(min
, max
));
583 static void unop_expr(struct expression
*expr
)
587 long long min
= whole_range
.min
;
588 long long max
= whole_range
.max
;
598 name
= get_variable_from_expr(expr
->unop
, &sym
);
601 if (expr
->op
== SPECIAL_INCREMENT
) {
602 if (get_implied_min(expr
->unop
, &val
))
604 if (!inside_loop() && get_implied_max(expr
->unop
, &val
))
607 if (expr
->op
== SPECIAL_DECREMENT
) {
608 if (get_implied_max(expr
->unop
, &val
))
610 if (!inside_loop() && get_implied_min(expr
->unop
, &val
))
613 set_extra_mod(name
, sym
, alloc_extra_state_range(min
, max
));
618 static void delete_state_tracker(struct tracker
*t
)
620 remove_from_equiv(t
->name
, t
->sym
);
621 delete_state(t
->owner
, t
->name
, t
->sym
);
624 static void scoped_state_extra(const char *name
, struct symbol
*sym
)
628 t
= alloc_tracker(SMATCH_EXTRA
, name
, sym
);
629 add_scope_hook((scope_hook
*)&delete_state_tracker
, t
);
632 static void match_declarations(struct symbol
*sym
)
637 name
= sym
->ident
->name
;
638 if (!sym
->initializer
) {
639 set_state(SMATCH_EXTRA
, name
, sym
, extra_undefined());
640 scoped_state_extra(name
, sym
);
645 static void match_function_def(struct symbol
*sym
)
650 FOR_EACH_PTR(sym
->ctype
.base_type
->arguments
, arg
) {
654 set_state(my_id
, arg
->ident
->name
, arg
, extra_undefined());
655 } END_FOR_EACH_PTR(arg
);
658 static int last_stmt_val(struct statement
*stmt
, long long *val
)
660 struct expression
*expr
;
665 stmt
= last_ptr_list((struct ptr_list
*)stmt
->stmts
);
666 if (stmt
->type
!= STMT_EXPRESSION
)
668 expr
= stmt
->expression
;
669 return get_value(expr
, val
);
672 static void match_comparison(struct expression
*expr
)
677 struct smatch_state
*true_state
;
678 struct smatch_state
*false_state
;
679 struct smatch_state
*orig
;
681 int comparison
= expr
->op
;
682 struct expression
*varies
= expr
->right
;
684 if (!get_value(expr
->left
, &fixed
)) {
685 if (!get_value(expr
->right
, &fixed
))
687 varies
= strip_expr(expr
->left
);
690 if (varies
->op
== SPECIAL_INCREMENT
|| varies
->op
== SPECIAL_DECREMENT
)
691 varies
= varies
->unop
;
692 if (varies
->type
== EXPR_CALL
) {
693 function_comparison(comparison
, varies
, fixed
, left
);
697 name
= get_variable_from_expr(varies
, &sym
);
701 orig
= get_state(my_id
, name
, sym
);
703 orig
= extra_undefined();
705 switch (comparison
) {
707 case SPECIAL_UNSIGNED_LT
:
709 true_state
= filter_range(orig
, fixed
, whole_range
.max
);
710 false_state
= filter_range(orig
, whole_range
.min
, fixed
- 1);
712 true_state
= filter_range(orig
, whole_range
.min
, fixed
);
713 false_state
= filter_range(orig
, fixed
+ 1, whole_range
.max
);
716 case SPECIAL_UNSIGNED_LTE
:
719 true_state
= filter_range(orig
, fixed
+ 1, whole_range
.max
);
720 false_state
= filter_range(orig
, whole_range
.min
, fixed
);
722 true_state
= filter_range(orig
, whole_range
.min
, fixed
- 1);
723 false_state
= filter_range(orig
, fixed
, whole_range
.max
);
727 if (possibly_true(SPECIAL_EQUAL
, get_dinfo(orig
), fixed
, fixed
))
728 true_state
= alloc_extra_state(fixed
);
730 true_state
= alloc_extra_state_empty();
731 false_state
= filter_range(orig
, fixed
, fixed
);
733 case SPECIAL_UNSIGNED_GTE
:
736 true_state
= filter_range(orig
, whole_range
.min
, fixed
- 1);
737 false_state
= filter_range(orig
, fixed
, whole_range
.max
);
739 true_state
= filter_range(orig
, fixed
+ 1, whole_range
.max
);
740 false_state
= filter_range(orig
, whole_range
.min
, fixed
);
744 case SPECIAL_UNSIGNED_GT
:
746 true_state
= filter_range(orig
, whole_range
.min
, fixed
);
747 false_state
= filter_range(orig
, fixed
+ 1, whole_range
.max
);
749 true_state
= filter_range(orig
, fixed
, whole_range
.max
);
750 false_state
= filter_range(orig
, whole_range
.min
, fixed
- 1);
753 case SPECIAL_NOTEQUAL
:
754 true_state
= filter_range(orig
, fixed
, fixed
);
755 if (possibly_true(SPECIAL_EQUAL
, get_dinfo(orig
), fixed
, fixed
))
756 false_state
= alloc_extra_state(fixed
);
758 false_state
= alloc_extra_state_empty();
761 sm_msg("unhandled comparison %d\n", comparison
);
764 set_extra_true_false(name
, sym
, true_state
, false_state
);
769 /* this is actually hooked from smatch_implied.c... it's hacky, yes */
770 void __extra_match_condition(struct expression
*expr
)
774 struct smatch_state
*pre_state
;
775 struct smatch_state
*true_state
;
776 struct smatch_state
*false_state
;
778 expr
= strip_expr(expr
);
779 switch (expr
->type
) {
781 function_comparison(SPECIAL_NOTEQUAL
, expr
, 0, 1);
786 name
= get_variable_from_expr(expr
, &sym
);
789 pre_state
= get_state(my_id
, name
, sym
);
790 true_state
= add_filter(pre_state
, 0);
791 if (possibly_true(SPECIAL_EQUAL
, get_dinfo(pre_state
), 0, 0))
792 false_state
= alloc_extra_state(0);
794 false_state
= alloc_extra_state_empty();
795 set_extra_true_false(name
, sym
, true_state
, false_state
);
799 match_comparison(expr
);
801 case EXPR_ASSIGNMENT
:
802 __extra_match_condition(expr
->left
);
807 /* returns 1 if it is not possible for expr to be value, otherwise returns 0 */
808 int implied_not_equal(struct expression
*expr
, long long val
)
812 struct smatch_state
*state
;
816 if (get_value(expr
, &expr_val
)) {
817 return expr_val
!= val
;
819 name
= get_variable_from_expr(expr
, &sym
);
822 state
= get_state(my_id
, name
, sym
);
823 if (!state
|| !state
->data
)
825 ret
= !possibly_false(SPECIAL_NOTEQUAL
, get_dinfo(state
), val
, 1);
831 int known_condition_true(struct expression
*expr
)
834 struct statement
*stmt
;
839 if (get_value(expr
, &tmp
) && tmp
)
842 expr
= strip_expr(expr
);
843 switch (expr
->type
) {
845 if (expr
->op
== '!') {
846 if (known_condition_false(expr
->unop
))
850 stmt
= get_expression_statement(expr
);
851 if (last_stmt_val(stmt
, &tmp
) && tmp
== 1)
860 int known_condition_false(struct expression
*expr
)
863 struct statement
*stmt
;
871 switch (expr
->type
) {
873 if (expr
->op
== '!') {
874 if (known_condition_true(expr
->unop
))
878 stmt
= get_expression_statement(expr
);
879 if (last_stmt_val(stmt
, &tmp
) && tmp
== 0)
883 if (sym_name_is("__builtin_constant_p", expr
->fn
))
892 struct range_list
*get_range_list(struct expression
*expr
)
896 struct range_list
*ret
= NULL
;
897 struct smatch_state
*state
;
899 state
= get_state_expr(SMATCH_EXTRA
, expr
);
901 return clone_range_list(get_dinfo(state
)->value_ranges
);
902 if (!get_absolute_min(expr
, &min
))
904 if (!get_absolute_max(expr
, &max
))
906 add_range(&ret
, min
, max
);
910 static int do_comparison(struct expression
*expr
)
912 struct range_list
*left_ranges
;
913 struct range_list
*right_ranges
;
914 int poss_true
, poss_false
;
916 left_ranges
= get_range_list(expr
->left
);
917 right_ranges
= get_range_list(expr
->right
);
919 poss_true
= possibly_true_range_lists(left_ranges
, expr
->op
, right_ranges
);
920 poss_false
= possibly_false_range_lists(left_ranges
, expr
->op
, right_ranges
);
922 free_range_list(&left_ranges
);
923 free_range_list(&right_ranges
);
925 if (!poss_true
&& !poss_false
)
927 if (poss_true
&& !poss_false
)
929 if (!poss_true
&& poss_false
)
934 int implied_condition_true(struct expression
*expr
)
936 struct statement
*stmt
;
943 if (get_implied_value(expr
, &tmp
) && tmp
)
946 if (expr
->type
== EXPR_POSTOP
)
947 return implied_condition_true(expr
->unop
);
949 if (expr
->type
== EXPR_PREOP
&& expr
->op
== SPECIAL_DECREMENT
)
950 return implied_not_equal(expr
->unop
, 1);
951 if (expr
->type
== EXPR_PREOP
&& expr
->op
== SPECIAL_INCREMENT
)
952 return implied_not_equal(expr
->unop
, -1);
954 expr
= strip_expr(expr
);
955 switch (expr
->type
) {
957 if (do_comparison(expr
) == 1)
961 if (expr
->op
== '!') {
962 if (implied_condition_false(expr
->unop
))
966 stmt
= get_expression_statement(expr
);
967 if (last_stmt_val(stmt
, &val
) && val
== 1)
971 if (implied_not_equal(expr
, 0) == 1)
978 int implied_condition_false(struct expression
*expr
)
980 struct statement
*stmt
;
981 struct expression
*tmp
;
990 switch (expr
->type
) {
992 if (do_comparison(expr
) == 2)
995 if (expr
->op
== '!') {
996 if (implied_condition_true(expr
->unop
))
1000 stmt
= get_expression_statement(expr
);
1001 if (last_stmt_val(stmt
, &val
) && val
== 0)
1003 tmp
= strip_expr(expr
);
1005 return implied_condition_false(tmp
);
1008 if (get_implied_value(expr
, &val
) && val
== 0)
1015 int get_implied_range_list(struct expression
*expr
, struct range_list
**rl
)
1018 struct smatch_state
*state
;
1020 expr
= strip_expr(expr
);
1022 state
= get_state_expr(my_id
, expr
);
1024 *rl
= clone_range_list(get_dinfo(state
)->value_ranges
);
1028 if (get_implied_value(expr
, &val
)) {
1030 add_range(rl
, val
, val
);
1034 if (expr
->type
== EXPR_BINOP
&& expr
->op
== '%') {
1035 if (!get_implied_value(expr
->right
, &val
))
1038 add_range(rl
, 0, val
- 1);
1045 int is_whole_range(struct smatch_state
*state
)
1047 struct data_info
*dinfo
;
1048 struct data_range
*drange
;
1052 dinfo
= get_dinfo(state
);
1053 drange
= first_ptr_list((struct ptr_list
*)dinfo
->value_ranges
);
1054 if (drange
->min
== whole_range
.min
&& drange
->max
== whole_range
.max
)
1059 void register_smatch_extra(int id
)
1062 add_merge_hook(my_id
, &merge_func
);
1063 add_unmatched_state_hook(my_id
, &unmatched_state
);
1064 add_hook(&unop_expr
, OP_HOOK
);
1065 add_hook(&match_function_def
, FUNC_DEF_HOOK
);
1066 add_hook(&match_function_call
, FUNCTION_CALL_HOOK
);
1067 add_hook(&match_assign
, ASSIGNMENT_HOOK
);
1068 add_hook(&match_declarations
, DECLARATION_HOOK
);