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.
23 #include "smatch_slist.h"
24 #include "smatch_extra.h"
28 struct string_list
*__ignored_macros
= NULL
;
29 static int in_warn_on_macro()
31 struct statement
*stmt
;
35 stmt
= last_ptr_list((struct ptr_list
*)big_statement_stack
);
36 macro
= get_macro_name(&stmt
->pos
);
40 FOR_EACH_PTR(__ignored_macros
, tmp
) {
41 if (!strcmp(tmp
, macro
))
43 } END_FOR_EACH_PTR(tmp
);
47 struct sm_state
*set_extra_mod(const char *name
, struct symbol
*sym
, struct smatch_state
*state
)
49 if (in_warn_on_macro())
51 remove_from_equiv(name
, sym
);
52 return set_state(SMATCH_EXTRA
, name
, sym
, state
);
55 struct sm_state
*set_extra_expr_mod(struct expression
*expr
, struct smatch_state
*state
)
57 if (in_warn_on_macro())
59 remove_from_equiv_expr(expr
);
60 return set_state_expr(SMATCH_EXTRA
, expr
, state
);
64 * This is for return_implies_state() hooks which modify a SMATCH_EXTRA state
66 void set_extra_expr_nomod(struct expression
*expr
, struct smatch_state
*state
)
69 struct smatch_state
*orig_state
;
71 orig_state
= get_state_expr(SMATCH_EXTRA
, expr
);
73 if (!estate_related(orig_state
)) {
74 set_state_expr(SMATCH_EXTRA
, expr
, state
);
78 FOR_EACH_PTR(estate_related(orig_state
), rel
) {
79 sm_msg("setting %s to %s", rel
->name
, state
->name
);
80 set_state(SMATCH_EXTRA
, rel
->name
, rel
->sym
, state
);
81 add_equiv(state
, rel
->name
, rel
->sym
);
82 } END_FOR_EACH_PTR(rel
);
85 static void set_extra_true_false(const char *name
, struct symbol
*sym
,
86 struct smatch_state
*true_state
,
87 struct smatch_state
*false_state
)
90 struct smatch_state
*orig_state
;
92 if (in_warn_on_macro())
95 orig_state
= get_state(SMATCH_EXTRA
, name
, sym
);
97 if (!estate_related(orig_state
)) {
98 set_true_false_states(SMATCH_EXTRA
, name
, sym
, true_state
, false_state
);
102 // FIXME!!!! equiv => related
103 FOR_EACH_PTR(estate_related(orig_state
), rel
) {
104 set_true_false_states(SMATCH_EXTRA
, rel
->name
, rel
->sym
,
105 true_state
, false_state
);
107 add_equiv(true_state
, rel
->name
, rel
->sym
);
109 add_equiv(false_state
, rel
->name
, rel
->sym
);
110 } END_FOR_EACH_PTR(rel
);
113 static void set_extra_expr_true_false(struct expression
*expr
,
114 struct smatch_state
*true_state
,
115 struct smatch_state
*false_state
)
120 expr
= strip_expr(expr
);
121 name
= get_variable_from_expr(expr
, &sym
);
124 set_extra_true_false(name
, sym
, true_state
, false_state
);
129 struct smatch_state
*filter_range(struct smatch_state
*orig
,
130 long long filter_min
, long long filter_max
)
132 struct smatch_state
*ret
;
133 struct data_info
*ret_info
;
136 orig
= extra_undefined();
137 ret
= alloc_estate_empty();
138 ret_info
= get_dinfo(ret
);
139 ret_info
->value_ranges
= remove_range(estate_ranges(orig
), filter_min
, filter_max
);
140 ret
->name
= show_ranges(ret_info
->value_ranges
);
144 struct smatch_state
*add_filter(struct smatch_state
*orig
, long long num
)
146 return filter_range(orig
, num
, num
);
149 static struct smatch_state
*merge_func(const char *name
, struct symbol
*sym
,
150 struct smatch_state
*s1
,
151 struct smatch_state
*s2
)
153 struct data_info
*ret_info
;
154 struct smatch_state
*tmp
;
155 struct range_list
*value_ranges
;
156 struct relation
*rel
;
157 struct relation
*new;
159 value_ranges
= range_list_union(estate_ranges(s1
), estate_ranges(s2
));
160 tmp
= alloc_estate_empty();
161 ret_info
= get_dinfo(tmp
);
162 ret_info
->value_ranges
= value_ranges
;
163 tmp
->name
= show_ranges(ret_info
->value_ranges
);
164 FOR_EACH_PTR(estate_related(s1
), rel
) {
165 new = get_common_relationship(s2
, rel
->op
, rel
->name
, rel
->sym
);
167 add_related(tmp
, new->op
, new->name
, new->sym
);
168 } END_FOR_EACH_PTR(rel
);
172 static struct sm_state
*handle_canonical_while_count_down(struct statement
*loop
)
174 struct expression
*iter_var
;
175 struct expression
*condition
;
179 condition
= strip_expr(loop
->iterator_pre_condition
);
182 if (condition
->type
!= EXPR_PREOP
&& condition
->type
!= EXPR_POSTOP
)
184 if (condition
->op
!= SPECIAL_DECREMENT
)
187 iter_var
= condition
->unop
;
188 sm
= get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
191 if (estate_min(sm
->state
) < 0)
193 start
= estate_max(sm
->state
);
196 if (start
!= whole_range
.max
)
199 if (condition
->type
== EXPR_PREOP
)
200 set_extra_expr_mod(iter_var
, alloc_estate_range(1, start
));
201 if (condition
->type
== EXPR_POSTOP
)
202 set_extra_expr_mod(iter_var
, alloc_estate_range(0, start
));
203 return get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
206 static struct sm_state
*handle_canonical_for_inc(struct expression
*iter_expr
,
207 struct expression
*condition
)
209 struct expression
*iter_var
;
214 iter_var
= iter_expr
->unop
;
215 sm
= get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
218 if (!estate_get_single_value(sm
->state
, &start
))
220 if (!get_implied_value(condition
->right
, &end
))
221 end
= whole_range
.max
;
222 if (get_sm_state_expr(SMATCH_EXTRA
, condition
->left
) != sm
)
225 switch (condition
->op
) {
226 case SPECIAL_NOTEQUAL
:
228 if (end
!= whole_range
.max
)
238 set_extra_expr_mod(iter_var
, alloc_estate_range(start
, end
));
239 return get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
242 static struct sm_state
*handle_canonical_for_dec(struct expression
*iter_expr
,
243 struct expression
*condition
)
245 struct expression
*iter_var
;
250 iter_var
= iter_expr
->unop
;
251 sm
= get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
254 if (!estate_get_single_value(sm
->state
, &start
))
256 if (!get_implied_value(condition
->right
, &end
))
257 end
= whole_range
.max
;
258 if (get_sm_state_expr(SMATCH_EXTRA
, condition
->left
) != sm
)
261 switch (condition
->op
) {
262 case SPECIAL_NOTEQUAL
:
264 if (end
!= whole_range
.min
)
274 set_extra_expr_mod(iter_var
, alloc_estate_range(end
, start
));
275 return get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
278 static struct sm_state
*handle_canonical_for_loops(struct statement
*loop
)
280 struct expression
*iter_expr
;
281 struct expression
*condition
;
283 if (!loop
->iterator_post_statement
)
285 if (loop
->iterator_post_statement
->type
!= STMT_EXPRESSION
)
287 iter_expr
= loop
->iterator_post_statement
->expression
;
288 if (!loop
->iterator_pre_condition
)
290 if (loop
->iterator_pre_condition
->type
!= EXPR_COMPARE
)
292 condition
= loop
->iterator_pre_condition
;
294 if (iter_expr
->op
== SPECIAL_INCREMENT
)
295 return handle_canonical_for_inc(iter_expr
, condition
);
296 if (iter_expr
->op
== SPECIAL_DECREMENT
)
297 return handle_canonical_for_dec(iter_expr
, condition
);
301 struct sm_state
*__extra_handle_canonical_loops(struct statement
*loop
, struct state_list
**slist
)
303 struct sm_state
*ret
;
305 __push_fake_cur_slist();
306 if (!loop
->iterator_post_statement
)
307 ret
= handle_canonical_while_count_down(loop
);
309 ret
= handle_canonical_for_loops(loop
);
310 *slist
= __pop_fake_cur_slist();
314 int __iterator_unchanged(struct sm_state
*sm
)
318 if (get_sm_state(my_id
, sm
->name
, sm
->sym
) == sm
)
323 static void while_count_down_after(struct sm_state
*sm
, struct expression
*condition
)
325 long long after_value
;
327 /* paranoid checking. prolly not needed */
328 condition
= strip_expr(condition
);
331 if (condition
->type
!= EXPR_PREOP
&& condition
->type
!= EXPR_POSTOP
)
333 if (condition
->op
!= SPECIAL_DECREMENT
)
335 after_value
= estate_min(sm
->state
);
337 set_extra_mod(sm
->name
, sm
->sym
, alloc_estate(after_value
));
340 void __extra_pre_loop_hook_after(struct sm_state
*sm
,
341 struct statement
*iterator
,
342 struct expression
*condition
)
344 struct expression
*iter_expr
;
349 struct smatch_state
*state
;
353 while_count_down_after(sm
, condition
);
357 iter_expr
= iterator
->expression
;
359 if (condition
->type
!= EXPR_COMPARE
)
361 if (!get_value(condition
->left
, &value
)) {
362 if (!get_value(condition
->right
, &value
))
367 name
= get_variable_from_expr(condition
->left
, &sym
);
369 name
= get_variable_from_expr(condition
->right
, &sym
);
372 if (sym
!= sm
->sym
|| strcmp(name
, sm
->name
))
374 state
= get_state(my_id
, name
, sym
);
375 min
= estate_min(state
);
376 max
= estate_max(state
);
377 if (iter_expr
->op
== SPECIAL_INCREMENT
&&
378 min
!= whole_range
.min
&&
379 max
== whole_range
.max
) {
380 set_extra_mod(name
, sym
, alloc_estate(min
));
381 } else if (min
== whole_range
.min
&& max
!= whole_range
.max
) {
382 set_extra_mod(name
, sym
, alloc_estate(max
));
389 static struct smatch_state
*unmatched_state(struct sm_state
*sm
)
391 return extra_undefined();
394 static void match_function_call(struct expression
*expr
)
396 struct expression
*tmp
;
398 FOR_EACH_PTR(expr
->args
, tmp
) {
399 if (tmp
->type
== EXPR_PREOP
&& tmp
->op
== '&') {
400 remove_from_equiv_expr(tmp
->unop
);
401 set_state_expr(SMATCH_EXTRA
, tmp
->unop
, extra_undefined());
403 } END_FOR_EACH_PTR(tmp
);
406 static void set_equiv(struct sm_state
*right_sm
, struct expression
*left
)
408 struct smatch_state
*state
;
409 struct relation
*rel
;
413 name
= get_variable_from_expr(left
, &sym
);
417 remove_from_equiv(name
, sym
);
419 state
= clone_estate(right_sm
->state
);
420 if (!estate_related(state
))
421 add_equiv(state
, right_sm
->name
, right_sm
->sym
);
422 add_equiv(state
, name
, sym
);
424 FOR_EACH_PTR(estate_related(state
), rel
) {
425 struct sm_state
*new_sm
;
427 new_sm
= clone_sm(right_sm
);
428 new_sm
->name
= rel
->name
;
429 new_sm
->sym
= rel
->sym
;
430 new_sm
->state
= state
;
432 } END_FOR_EACH_PTR(rel
);
437 static void match_assign(struct expression
*expr
)
439 struct expression
*left
;
440 struct expression
*right
;
441 struct sm_state
*right_sm
;
442 struct symbol
*right_sym
;
448 long long min
= whole_range
.min
;
449 long long max
= whole_range
.max
;
452 if (__is_condition_assign(expr
))
454 left
= strip_expr(expr
->left
);
455 name
= get_variable_from_expr(left
, &sym
);
458 right
= strip_parens(expr
->right
);
459 while (right
->type
== EXPR_ASSIGNMENT
&& right
->op
== '=')
460 right
= strip_parens(right
->left
);
462 if (expr
->op
== '=' && right
->type
== EXPR_CALL
)
463 return; /* these are handled in match_call_assign() */
465 right_name
= get_variable_from_expr(right
, &right_sym
);
466 if (expr
->op
== '=' && right_name
&& right_sym
) {
467 right_sm
= get_sm_state_expr(SMATCH_EXTRA
, right
);
469 right_sm
= set_state_expr(SMATCH_EXTRA
, right
, extra_undefined());
472 set_equiv(right_sm
, left
);
476 known
= get_implied_value(right
, &value
);
479 struct range_list
*rl
= NULL
;
481 if (get_implied_range_list(right
, &rl
)) {
482 set_extra_mod(name
, sym
, alloc_estate_range_list(rl
));
486 if (expr_unsigned(right
))
490 case SPECIAL_ADD_ASSIGN
:
491 if (get_implied_min(left
, &tmp
)) {
497 if (!inside_loop() && known
&& get_implied_max(left
, &tmp
))
500 case SPECIAL_SUB_ASSIGN
:
501 if (get_implied_max(left
, &tmp
)) {
507 if (!inside_loop() && known
&& get_implied_min(left
, &tmp
))
511 set_extra_mod(name
, sym
, alloc_estate_range(min
, max
));
513 free_string(right_name
);
517 static void reset_struct_members(const char *name
, struct symbol
*sym
, struct expression
*expr
, void *unused
)
519 struct state_list
*slist
;
520 struct sm_state
*tmp
;
524 slist
= get_all_states(SMATCH_EXTRA
);
525 FOR_EACH_PTR(slist
, tmp
) {
528 if (strncmp(name
, tmp
->name
, len
))
530 if (tmp
->name
[len
] != '-' && tmp
->name
[len
] != '.')
532 set_extra_mod(tmp
->name
, tmp
->sym
, extra_undefined());
533 } END_FOR_EACH_PTR(tmp
);
536 static struct smatch_state
*increment_state(struct smatch_state
*state
)
538 long long min
= estate_min(state
);
539 long long max
= estate_max(state
);
542 max
= whole_range
.max
;
544 if (min
!= whole_range
.min
)
546 if (max
!= whole_range
.max
)
548 return alloc_estate_range(min
, max
);
551 static struct smatch_state
*decrement_state(struct smatch_state
*state
)
553 long long min
= estate_min(state
);
554 long long max
= estate_max(state
);
557 min
= whole_range
.min
;
559 if (min
!= whole_range
.min
)
561 if (max
!= whole_range
.max
)
563 return alloc_estate_range(min
, max
);
566 static void unop_expr(struct expression
*expr
)
568 struct smatch_state
*state
;
570 if (expr
->smatch_flags
& Handled
)
574 case SPECIAL_INCREMENT
:
575 state
= get_state_expr(SMATCH_EXTRA
, expr
->unop
);
576 state
= increment_state(state
);
577 set_extra_expr_mod(expr
->unop
, state
);
579 case SPECIAL_DECREMENT
:
580 state
= get_state_expr(SMATCH_EXTRA
, expr
->unop
);
581 state
= decrement_state(state
);
582 set_extra_expr_mod(expr
->unop
, state
);
589 static void delete_state_tracker(struct tracker
*t
)
591 remove_from_equiv(t
->name
, t
->sym
);
592 delete_state(t
->owner
, t
->name
, t
->sym
);
595 static void scoped_state_extra(const char *name
, struct symbol
*sym
)
599 t
= alloc_tracker(SMATCH_EXTRA
, name
, sym
);
600 add_scope_hook((scope_hook
*)&delete_state_tracker
, t
);
603 static void match_declarations(struct symbol
*sym
)
608 name
= sym
->ident
->name
;
609 if (!sym
->initializer
) {
610 set_state(SMATCH_EXTRA
, name
, sym
, extra_undefined());
611 scoped_state_extra(name
, sym
);
616 static void match_function_def(struct symbol
*sym
)
620 FOR_EACH_PTR(sym
->ctype
.base_type
->arguments
, arg
) {
623 set_state(my_id
, arg
->ident
->name
, arg
, extra_undefined());
624 } END_FOR_EACH_PTR(arg
);
627 static int last_stmt_val(struct statement
*stmt
, long long *val
)
629 struct expression
*expr
;
634 stmt
= last_ptr_list((struct ptr_list
*)stmt
->stmts
);
635 if (stmt
->type
!= STMT_EXPRESSION
)
637 expr
= stmt
->expression
;
638 return get_value(expr
, val
);
641 static int match_func_comparison(struct expression
*expr
)
643 struct expression
*left
= strip_expr(expr
->left
);
644 struct expression
*right
= strip_expr(expr
->right
);
647 if (left
->type
== EXPR_CALL
) {
648 if (!get_implied_value(right
, &val
))
650 function_comparison(expr
->op
, left
, val
, 1);
654 if (right
->type
== EXPR_CALL
) {
655 if (!get_implied_value(left
, &val
))
657 function_comparison(expr
->op
, right
, val
, 0);
664 static void match_comparison(struct expression
*expr
)
666 struct expression
*left
= strip_expr(expr
->left
);
667 struct expression
*right
= strip_expr(expr
->right
);
668 struct range_list
*left_orig
;
669 struct range_list
*left_true
;
670 struct range_list
*left_false
;
671 struct range_list
*right_orig
;
672 struct range_list
*right_true
;
673 struct range_list
*right_false
;
674 struct smatch_state
*left_true_state
;
675 struct smatch_state
*left_false_state
;
676 struct smatch_state
*right_true_state
;
677 struct smatch_state
*right_false_state
;
679 int right_postop
= 0;
681 if (match_func_comparison(expr
))
684 if (left
->op
== SPECIAL_INCREMENT
|| left
->op
== SPECIAL_DECREMENT
) {
685 if (left
->type
== EXPR_POSTOP
) {
686 left
->smatch_flags
|= Handled
;
687 left_postop
= left
->op
;
689 left
= strip_expr(left
->unop
);
692 if (right
->op
== SPECIAL_INCREMENT
|| right
->op
== SPECIAL_DECREMENT
) {
693 if (right
->type
== EXPR_POSTOP
) {
694 right
->smatch_flags
|= Handled
;
695 right_postop
= right
->op
;
697 right
= strip_expr(right
->unop
);
700 if (!get_implied_range_list(left
, &left_orig
))
701 left_orig
= alloc_range_list(whole_range
.min
, whole_range
.max
);
702 if (!get_implied_range_list(right
, &right_orig
))
703 right_orig
= alloc_range_list(whole_range
.min
, whole_range
.max
);
705 left_true
= clone_range_list(left_orig
);
706 left_false
= clone_range_list(left_orig
);
707 right_true
= clone_range_list(right_orig
);
708 right_false
= clone_range_list(right_orig
);
712 case SPECIAL_UNSIGNED_LT
:
713 if (rl_max(right_orig
) != whole_range
.max
)
714 left_true
= remove_range(left_orig
, rl_max(right_orig
), whole_range
.max
);
715 if (rl_min(right_orig
) != whole_range
.min
)
716 left_false
= remove_range(left_orig
, whole_range
.min
, rl_min(right_orig
) - 1);
718 if (rl_min(left_orig
) != whole_range
.min
)
719 right_true
= remove_range(right_orig
, whole_range
.min
, rl_min(left_orig
));
720 if (rl_max(left_orig
) != whole_range
.max
)
721 right_false
= remove_range(right_orig
, rl_max(left_orig
) + 1, whole_range
.max
);
723 case SPECIAL_UNSIGNED_LTE
:
725 if (rl_max(right_orig
) != whole_range
.max
)
726 left_true
= remove_range(left_orig
, rl_max(right_orig
) + 1, whole_range
.max
);
727 if (rl_min(right_orig
) != whole_range
.min
)
728 left_false
= remove_range(left_orig
, whole_range
.min
, rl_min(right_orig
));
730 if (rl_min(left_orig
) != whole_range
.min
)
731 right_true
= remove_range(right_orig
, whole_range
.min
, rl_min(left_orig
) - 1);
732 if (rl_max(left_orig
) != whole_range
.max
)
733 right_false
= remove_range(right_orig
, rl_max(left_orig
), whole_range
.max
);
736 if (rl_max(right_orig
) != whole_range
.max
)
737 left_true
= remove_range(left_true
, rl_max(right_orig
) + 1, whole_range
.max
);
738 if (rl_min(right_orig
) != whole_range
.min
)
739 left_true
= remove_range(left_true
, whole_range
.min
, rl_min(right_orig
) - 1);
740 if (rl_min(right_orig
) == rl_max(right_orig
))
741 left_false
= remove_range(left_orig
, rl_min(right_orig
), rl_min(right_orig
));
743 if (rl_max(left_orig
) != whole_range
.max
)
744 right_true
= remove_range(right_true
, rl_max(left_orig
) + 1, whole_range
.max
);
745 if (rl_min(left_orig
) != whole_range
.min
)
746 right_true
= remove_range(right_true
, whole_range
.min
, rl_min(left_orig
) - 1);
747 if (rl_min(left_orig
) == rl_max(left_orig
))
748 right_false
= remove_range(right_orig
, rl_min(left_orig
), rl_min(left_orig
));
750 case SPECIAL_UNSIGNED_GTE
:
752 if (rl_min(right_orig
) != whole_range
.min
)
753 left_true
= remove_range(left_orig
, whole_range
.min
, rl_min(right_orig
) - 1);
754 if (rl_max(right_orig
) != whole_range
.max
)
755 left_false
= remove_range(left_orig
, rl_max(right_orig
), whole_range
.max
);
757 if (rl_max(left_orig
) != whole_range
.max
)
758 right_true
= remove_range(right_orig
, rl_max(left_orig
) + 1, whole_range
.max
);
759 if (rl_min(left_orig
) != whole_range
.min
)
760 right_false
= remove_range(right_orig
, whole_range
.min
, rl_min(left_orig
));
763 case SPECIAL_UNSIGNED_GT
:
764 if (rl_min(right_orig
) != whole_range
.min
)
765 left_true
= remove_range(left_orig
, whole_range
.min
, rl_min(right_orig
));
766 if (rl_max(right_orig
) != whole_range
.max
)
767 left_false
= remove_range(left_orig
, rl_max(right_orig
) + 1, whole_range
.max
);
769 if (rl_max(left_orig
) != whole_range
.max
)
770 right_true
= remove_range(right_orig
, rl_max(left_orig
), whole_range
.max
);
771 if (rl_min(left_orig
) != whole_range
.min
)
772 right_false
= remove_range(right_orig
, whole_range
.min
, rl_min(left_orig
) - 1);
774 case SPECIAL_NOTEQUAL
:
775 if (rl_max(right_orig
) != whole_range
.max
)
776 left_false
= remove_range(left_false
, rl_max(right_orig
) + 1, whole_range
.max
);
777 if (rl_min(right_orig
) != whole_range
.min
)
778 left_false
= remove_range(left_false
, whole_range
.min
, rl_min(right_orig
) - 1);
779 if (rl_min(right_orig
) == rl_max(right_orig
))
780 left_true
= remove_range(left_orig
, rl_min(right_orig
), rl_min(right_orig
));
782 if (rl_max(left_orig
) != whole_range
.max
)
783 right_false
= remove_range(right_false
, rl_max(left_orig
) + 1, whole_range
.max
);
784 if (rl_min(left_orig
) != whole_range
.min
)
785 right_false
= remove_range(right_false
, whole_range
.min
, rl_min(left_orig
) - 1);
786 if (rl_min(left_orig
) == rl_max(left_orig
))
787 right_true
= remove_range(right_orig
, rl_min(left_orig
), rl_min(left_orig
));
793 left_true_state
= alloc_estate_range_list(left_true
);
794 left_false_state
= alloc_estate_range_list(left_false
);
795 right_true_state
= alloc_estate_range_list(right_true
);
796 right_false_state
= alloc_estate_range_list(right_false
);
798 if (left_postop
== SPECIAL_INCREMENT
) {
799 left_true_state
= increment_state(left_true_state
);
800 left_false_state
= increment_state(left_false_state
);
802 if (left_postop
== SPECIAL_DECREMENT
) {
803 left_true_state
= decrement_state(left_true_state
);
804 left_false_state
= decrement_state(left_false_state
);
806 if (right_postop
== SPECIAL_INCREMENT
) {
807 right_true_state
= increment_state(right_true_state
);
808 right_false_state
= increment_state(right_false_state
);
810 if (right_postop
== SPECIAL_DECREMENT
) {
811 right_true_state
= decrement_state(right_true_state
);
812 right_false_state
= decrement_state(right_false_state
);
815 set_extra_expr_true_false(left
, left_true_state
, left_false_state
);
816 set_extra_expr_true_false(right
, right_true_state
, right_false_state
);
819 /* this is actually hooked from smatch_implied.c... it's hacky, yes */
820 void __extra_match_condition(struct expression
*expr
)
824 struct smatch_state
*pre_state
;
825 struct smatch_state
*true_state
;
826 struct smatch_state
*false_state
;
828 expr
= strip_expr(expr
);
829 switch (expr
->type
) {
831 function_comparison(SPECIAL_NOTEQUAL
, expr
, 0, 1);
836 name
= get_variable_from_expr(expr
, &sym
);
839 pre_state
= get_state(my_id
, name
, sym
);
840 true_state
= add_filter(pre_state
, 0);
841 if (possibly_true(SPECIAL_EQUAL
, expr
, 0, 0))
842 false_state
= alloc_estate(0);
844 false_state
= alloc_estate_empty();
845 set_extra_true_false(name
, sym
, true_state
, false_state
);
849 match_comparison(expr
);
851 case EXPR_ASSIGNMENT
:
852 __extra_match_condition(expr
->left
);
857 /* returns 1 if it is not possible for expr to be value, otherwise returns 0 */
858 int implied_not_equal(struct expression
*expr
, long long val
)
860 return !possibly_false(SPECIAL_NOTEQUAL
, expr
, val
, 1);
863 int known_condition_true(struct expression
*expr
)
866 struct statement
*stmt
;
871 if (get_value(expr
, &tmp
) && tmp
)
874 expr
= strip_expr(expr
);
875 switch (expr
->type
) {
877 if (expr
->op
== '!') {
878 if (known_condition_false(expr
->unop
))
882 stmt
= get_expression_statement(expr
);
883 if (last_stmt_val(stmt
, &tmp
) && tmp
== 1)
892 int known_condition_false(struct expression
*expr
)
895 struct statement
*stmt
;
903 switch (expr
->type
) {
905 if (expr
->op
== '!') {
906 if (known_condition_true(expr
->unop
))
910 stmt
= get_expression_statement(expr
);
911 if (last_stmt_val(stmt
, &tmp
) && tmp
== 0)
915 if (sym_name_is("__builtin_constant_p", expr
->fn
))
924 struct range_list
*get_range_list(struct expression
*expr
)
928 struct range_list
*ret
= NULL
;
929 struct smatch_state
*state
;
931 state
= get_state_expr(SMATCH_EXTRA
, expr
);
933 return clone_range_list(estate_ranges(state
));
934 if (!get_absolute_min(expr
, &min
))
936 if (!get_absolute_max(expr
, &max
))
938 add_range(&ret
, min
, max
);
942 static int do_comparison(struct expression
*expr
)
944 struct range_list
*left_ranges
;
945 struct range_list
*right_ranges
;
946 int poss_true
, poss_false
;
948 left_ranges
= get_range_list(expr
->left
);
949 right_ranges
= get_range_list(expr
->right
);
951 poss_true
= possibly_true_range_lists(left_ranges
, expr
->op
, right_ranges
);
952 poss_false
= possibly_false_range_lists(left_ranges
, expr
->op
, right_ranges
);
954 free_range_list(&left_ranges
);
955 free_range_list(&right_ranges
);
957 if (!poss_true
&& !poss_false
)
959 if (poss_true
&& !poss_false
)
961 if (!poss_true
&& poss_false
)
966 int implied_condition_true(struct expression
*expr
)
968 struct statement
*stmt
;
975 if (get_implied_value(expr
, &tmp
) && tmp
)
978 if (expr
->type
== EXPR_POSTOP
)
979 return implied_condition_true(expr
->unop
);
981 if (expr
->type
== EXPR_PREOP
&& expr
->op
== SPECIAL_DECREMENT
)
982 return implied_not_equal(expr
->unop
, 1);
983 if (expr
->type
== EXPR_PREOP
&& expr
->op
== SPECIAL_INCREMENT
)
984 return implied_not_equal(expr
->unop
, -1);
986 expr
= strip_expr(expr
);
987 switch (expr
->type
) {
989 if (do_comparison(expr
) == 1)
993 if (expr
->op
== '!') {
994 if (implied_condition_false(expr
->unop
))
998 stmt
= get_expression_statement(expr
);
999 if (last_stmt_val(stmt
, &val
) && val
== 1)
1003 if (implied_not_equal(expr
, 0) == 1)
1010 int implied_condition_false(struct expression
*expr
)
1012 struct statement
*stmt
;
1013 struct expression
*tmp
;
1022 switch (expr
->type
) {
1024 if (do_comparison(expr
) == 2)
1027 if (expr
->op
== '!') {
1028 if (implied_condition_true(expr
->unop
))
1032 stmt
= get_expression_statement(expr
);
1033 if (last_stmt_val(stmt
, &val
) && val
== 0)
1035 tmp
= strip_expr(expr
);
1037 return implied_condition_false(tmp
);
1040 if (get_implied_value(expr
, &val
) && val
== 0)
1047 int get_implied_range_list(struct expression
*expr
, struct range_list
**rl
)
1050 struct smatch_state
*state
;
1054 expr
= strip_parens(expr
);
1058 state
= get_state_expr(my_id
, expr
);
1060 *rl
= clone_range_list(estate_ranges(state
));
1064 if (get_implied_value(expr
, &val
)) {
1066 add_range(rl
, val
, val
);
1070 if (expr
->type
!= EXPR_BINOP
)
1073 if (expr
->type
== EXPR_CALL
) {
1074 *rl
= db_return_vals(expr
);
1078 if (expr
->op
== '%') {
1079 if (!get_implied_value(expr
->right
, &val
))
1082 add_range(rl
, 0, val
- 1);
1086 if (!get_implied_min(expr
, &min
))
1088 if (!get_implied_max(expr
, &max
))
1091 *rl
= alloc_range_list(min
, max
);
1095 int is_whole_range(struct smatch_state
*state
)
1097 struct data_range
*drange
;
1099 if (!estate_ranges(state
))
1101 drange
= first_ptr_list((struct ptr_list
*)estate_ranges(state
));
1102 if (drange
->min
== whole_range
.min
&& drange
->max
== whole_range
.max
)
1107 static void struct_member_callback(char *fn
, int param
, char *printed_name
, struct smatch_state
*state
)
1109 if (is_whole_range(state
))
1111 sm_msg("info: passes param_value '%s' %d '%s' %s", fn
, param
, printed_name
, state
->name
);
1114 static void match_call_info(struct expression
*expr
)
1116 struct range_list
*rl
= NULL
;
1117 struct expression
*arg
;
1121 name
= get_fnptr_name(expr
->fn
);
1125 FOR_EACH_PTR(expr
->args
, arg
) {
1126 if (get_implied_range_list(arg
, &rl
) && !is_whole_range_rl(rl
)) {
1127 sm_msg("info: passes param_value '%s' %d '$$' %s",
1128 name
, i
, show_ranges(rl
));
1131 } END_FOR_EACH_PTR(arg
);
1136 void set_param_value(const char *name
, struct symbol
*sym
, char *key
, char *value
)
1138 struct range_list
*rl
= NULL
;
1139 struct smatch_state
*state
;
1142 if (strncmp(key
, "$$", 2))
1145 snprintf(fullname
, 256, "%s%s", name
, key
+ 2);
1146 get_value_ranges(value
, &rl
);
1147 char *tmp
= show_ranges(rl
);
1148 if (strcmp(tmp
, value
))
1149 sm_msg("value = %s, ranges = %s", value
, tmp
);
1150 state
= alloc_estate_range_list(rl
);
1151 set_state(SMATCH_EXTRA
, fullname
, sym
, state
);
1154 static void match_call_assign(struct expression
*expr
)
1156 struct expression
*right
;
1157 struct range_list
*rl
;
1159 if (expr
->op
!= '=')
1162 right
= strip_parens(expr
->right
);
1163 while (right
->type
== EXPR_ASSIGNMENT
&& right
->op
== '=')
1164 right
= strip_parens(right
->left
);
1166 rl
= db_return_vals(right
);
1168 set_extra_expr_mod(expr
->left
, alloc_estate_range_list(rl
));
1170 set_extra_expr_mod(expr
->left
, extra_undefined());
1173 void register_smatch_extra(int id
)
1176 add_merge_hook(my_id
, &merge_func
);
1177 add_unmatched_state_hook(my_id
, &unmatched_state
);
1178 add_hook(&unop_expr
, OP_HOOK
);
1179 add_hook(&match_function_def
, FUNC_DEF_HOOK
);
1180 add_hook(&match_function_call
, FUNCTION_CALL_HOOK
);
1181 add_hook(&match_assign
, ASSIGNMENT_HOOK
);
1182 add_hook(&match_call_assign
, CALL_ASSIGNMENT_HOOK
);
1183 add_hook(&match_declarations
, DECLARATION_HOOK
);
1185 add_hook(&match_call_info
, FUNCTION_CALL_HOOK
);
1186 add_member_info_callback(my_id
, struct_member_callback
);
1188 add_definition_db_callback(set_param_value
, PARAM_VALUE
);
1191 void register_smatch_extra_late(int id
)
1193 set_default_modification_hook(SMATCH_EXTRA
, reset_struct_members
);