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
= get_current_statement();
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 set_related(&state
, estate_related(orig_state
));
79 FOR_EACH_PTR(estate_related(orig_state
), rel
) {
80 if (option_debug_related
)
81 sm_msg("updating related %s to %s", rel
->name
, state
->name
);
82 set_state(SMATCH_EXTRA
, rel
->name
, rel
->sym
, state
);
83 } END_FOR_EACH_PTR(rel
);
86 static void set_extra_true_false(const char *name
, struct symbol
*sym
,
87 struct smatch_state
*true_state
,
88 struct smatch_state
*false_state
)
91 struct smatch_state
*orig_state
;
93 if (in_warn_on_macro())
96 orig_state
= get_state(SMATCH_EXTRA
, name
, sym
);
98 if (!estate_related(orig_state
)) {
99 set_true_false_states(SMATCH_EXTRA
, name
, sym
, true_state
, false_state
);
104 set_related(&true_state
, estate_related(orig_state
));
106 set_related(&false_state
, estate_related(orig_state
));
108 FOR_EACH_PTR(estate_related(orig_state
), rel
) {
109 set_true_false_states(SMATCH_EXTRA
, rel
->name
, rel
->sym
,
110 true_state
, false_state
);
111 } END_FOR_EACH_PTR(rel
);
114 static void set_extra_expr_true_false(struct expression
*expr
,
115 struct smatch_state
*true_state
,
116 struct smatch_state
*false_state
)
121 expr
= strip_expr(expr
);
122 name
= get_variable_from_expr(expr
, &sym
);
125 set_extra_true_false(name
, sym
, true_state
, false_state
);
130 struct smatch_state
*filter_range_list(struct smatch_state
*orig
,
131 struct range_list_sval
*rl
)
133 struct range_list_sval
*res
;
134 struct data_range_sval
*tmp
;
137 orig
= extra_undefined();
138 res
= estate_ranges_sval(orig
);
140 FOR_EACH_PTR(rl
, tmp
) {
141 res
= remove_range_sval(res
, tmp
->min
, tmp
->max
);
142 } END_FOR_EACH_PTR(tmp
);
144 return alloc_estate_range_list_sval(res
);
147 struct smatch_state
*filter_range(struct smatch_state
*orig
,
148 sval_t filter_min
, sval_t filter_max
)
150 struct range_list_sval
*rl
;
153 orig
= extra_undefined();
155 rl
= remove_range_sval(estate_ranges_sval(orig
), filter_min
, filter_max
);
156 return alloc_estate_range_list_sval(rl
);
159 struct smatch_state
*add_filter(struct smatch_state
*orig
, sval_t sval
)
161 return filter_range(orig
, sval
, sval
);
164 static struct smatch_state
*merge_func(struct smatch_state
*s1
, struct smatch_state
*s2
)
166 struct smatch_state
*tmp
;
167 struct range_list_sval
*value_ranges
;
168 struct related_list
*rlist
;
170 if (estates_equiv(s1
, s2
))
173 value_ranges
= range_list_union_sval(estate_ranges_sval(s1
), estate_ranges_sval(s2
));
174 tmp
= alloc_estate_range_list_sval(value_ranges
);
175 rlist
= get_shared_relations(estate_related(s1
), estate_related(s2
));
176 set_related(&tmp
, rlist
);
181 static struct sm_state
*handle_canonical_while_count_down(struct statement
*loop
)
183 struct expression
*iter_var
;
184 struct expression
*condition
;
188 condition
= strip_expr(loop
->iterator_pre_condition
);
191 if (condition
->type
!= EXPR_PREOP
&& condition
->type
!= EXPR_POSTOP
)
193 if (condition
->op
!= SPECIAL_DECREMENT
)
196 iter_var
= condition
->unop
;
197 sm
= get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
200 if (estate_min(sm
->state
) < 0)
202 start
= estate_max_sval(sm
->state
);
203 if (sval_cmp_val(start
, 0) <= 0)
205 if (!sval_is_max(start
))
208 if (condition
->type
== EXPR_PREOP
)
209 set_extra_expr_mod(iter_var
, alloc_estate_range_sval(ll_to_sval(1), start
));
210 if (condition
->type
== EXPR_POSTOP
)
211 set_extra_expr_mod(iter_var
, alloc_estate_range_sval(ll_to_sval(0), start
));
212 return get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
215 static struct sm_state
*handle_canonical_for_inc(struct expression
*iter_expr
,
216 struct expression
*condition
)
218 struct expression
*iter_var
;
222 iter_var
= iter_expr
->unop
;
223 sm
= get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
226 if (!estate_get_single_value_sval(sm
->state
, &start
))
228 if (!get_implied_value_sval(condition
->right
, &end
))
229 end
= ll_to_sval(whole_range
.max
);
231 if (get_sm_state_expr(SMATCH_EXTRA
, condition
->left
) != sm
)
234 switch (condition
->op
) {
235 case SPECIAL_NOTEQUAL
:
237 if (!sval_is_max(end
))
245 if (sval_cmp(end
, start
) < 0)
247 set_extra_expr_mod(iter_var
, alloc_estate_range_sval(start
, end
));
248 return get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
251 static struct sm_state
*handle_canonical_for_dec(struct expression
*iter_expr
,
252 struct expression
*condition
)
254 struct expression
*iter_var
;
258 iter_var
= iter_expr
->unop
;
259 sm
= get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
262 if (!estate_get_single_value_sval(sm
->state
, &start
))
264 if (!get_implied_value_sval(condition
->right
, &end
))
265 end
= ll_to_sval(whole_range
.max
);
266 if (get_sm_state_expr(SMATCH_EXTRA
, condition
->left
) != sm
)
269 switch (condition
->op
) {
270 case SPECIAL_NOTEQUAL
:
272 if (!sval_is_max(end
))
280 if (sval_cmp(end
, start
) > 0)
282 set_extra_expr_mod(iter_var
, alloc_estate_range_sval(end
, start
));
283 return get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
286 static struct sm_state
*handle_canonical_for_loops(struct statement
*loop
)
288 struct expression
*iter_expr
;
289 struct expression
*condition
;
291 if (!loop
->iterator_post_statement
)
293 if (loop
->iterator_post_statement
->type
!= STMT_EXPRESSION
)
295 iter_expr
= loop
->iterator_post_statement
->expression
;
296 if (!loop
->iterator_pre_condition
)
298 if (loop
->iterator_pre_condition
->type
!= EXPR_COMPARE
)
300 condition
= loop
->iterator_pre_condition
;
302 if (iter_expr
->op
== SPECIAL_INCREMENT
)
303 return handle_canonical_for_inc(iter_expr
, condition
);
304 if (iter_expr
->op
== SPECIAL_DECREMENT
)
305 return handle_canonical_for_dec(iter_expr
, condition
);
309 struct sm_state
*__extra_handle_canonical_loops(struct statement
*loop
, struct state_list
**slist
)
311 struct sm_state
*ret
;
313 __push_fake_cur_slist();
314 if (!loop
->iterator_post_statement
)
315 ret
= handle_canonical_while_count_down(loop
);
317 ret
= handle_canonical_for_loops(loop
);
318 *slist
= __pop_fake_cur_slist();
322 int __iterator_unchanged(struct sm_state
*sm
)
326 if (get_sm_state(my_id
, sm
->name
, sm
->sym
) == sm
)
331 static void while_count_down_after(struct sm_state
*sm
, struct expression
*condition
)
335 /* paranoid checking. prolly not needed */
336 condition
= strip_expr(condition
);
339 if (condition
->type
!= EXPR_PREOP
&& condition
->type
!= EXPR_POSTOP
)
341 if (condition
->op
!= SPECIAL_DECREMENT
)
343 after_value
= estate_min_sval(sm
->state
);
345 set_extra_mod(sm
->name
, sm
->sym
, alloc_estate_sval(after_value
));
348 void __extra_pre_loop_hook_after(struct sm_state
*sm
,
349 struct statement
*iterator
,
350 struct expression
*condition
)
352 struct expression
*iter_expr
;
357 struct smatch_state
*state
;
361 while_count_down_after(sm
, condition
);
365 iter_expr
= iterator
->expression
;
367 if (condition
->type
!= EXPR_COMPARE
)
369 if (!get_value_sval(condition
->left
, &value
)) {
370 if (!get_value_sval(condition
->right
, &value
))
375 name
= get_variable_from_expr(condition
->left
, &sym
);
377 name
= get_variable_from_expr(condition
->right
, &sym
);
380 if (sym
!= sm
->sym
|| strcmp(name
, sm
->name
))
382 state
= get_state(my_id
, name
, sym
);
383 min
= estate_min_sval(state
);
384 max
= estate_max_sval(state
);
385 if (iter_expr
->op
== SPECIAL_INCREMENT
&&
386 !sval_is_min(min
) && sval_is_max(max
))
387 set_extra_mod(name
, sym
, alloc_estate_sval(min
));
388 else if (sval_is_min(min
) && !sval_is_max(max
))
389 set_extra_mod(name
, sym
, alloc_estate_sval(max
));
396 static struct smatch_state
*unmatched_state(struct sm_state
*sm
)
398 return extra_undefined();
401 static void match_function_call(struct expression
*expr
)
403 struct expression
*arg
;
404 struct expression
*tmp
;
406 FOR_EACH_PTR(expr
->args
, arg
) {
407 tmp
= strip_expr(arg
);
408 if (tmp
->type
== EXPR_PREOP
&& tmp
->op
== '&') {
409 remove_from_equiv_expr(tmp
->unop
);
410 set_state_expr(SMATCH_EXTRA
, tmp
->unop
, extra_undefined());
412 } END_FOR_EACH_PTR(arg
);
415 static void match_assign(struct expression
*expr
)
417 struct expression
*left
;
418 struct expression
*right
;
419 struct symbol
*right_sym
;
425 sval_t min
= ll_to_sval(whole_range
.min
);
426 sval_t max
= ll_to_sval(whole_range
.max
);
429 if (__is_condition_assign(expr
))
431 left
= strip_expr(expr
->left
);
432 name
= get_variable_from_expr(left
, &sym
);
435 right
= strip_parens(expr
->right
);
436 while (right
->type
== EXPR_ASSIGNMENT
&& right
->op
== '=')
437 right
= strip_parens(right
->left
);
439 if (expr
->op
== '=' && right
->type
== EXPR_CALL
)
440 return; /* these are handled in match_call_assign() */
442 right_name
= get_variable_from_expr(right
, &right_sym
);
443 if (expr
->op
== '=' && right_name
&& right_sym
) {
444 set_equiv(left
, right
);
448 known
= get_implied_value_sval(right
, &value
);
451 struct range_list
*rl
= NULL
;
453 if (get_implied_range_list(right
, &rl
)) {
454 set_extra_mod(name
, sym
, alloc_estate_range_list(rl
));
458 if (expr_unsigned(right
))
459 min
= ll_to_sval(0); // FIXME
462 case SPECIAL_ADD_ASSIGN
:
463 if (get_implied_min_sval(left
, &tmp
)) {
465 min
= sval_binop(tmp
, '+', value
);
469 if (!inside_loop() && known
&& get_implied_max_sval(left
, &tmp
))
470 max
= sval_binop(tmp
, '+', value
);
472 case SPECIAL_SUB_ASSIGN
:
473 if (get_implied_max_sval(left
, &tmp
)) {
475 max
= sval_binop(tmp
, '-', value
);
479 if (!inside_loop() && known
&& get_implied_min_sval(left
, &tmp
))
480 min
= sval_binop(tmp
, '-', value
);
483 set_extra_mod(name
, sym
, alloc_estate_range_sval(min
, max
));
485 free_string(right_name
);
489 static void reset_struct_members(struct sm_state
*sm
)
491 set_extra_mod(sm
->name
, sm
->sym
, extra_undefined());
494 static struct smatch_state
*increment_state(struct smatch_state
*state
)
496 long long min
= estate_min(state
);
497 long long max
= estate_max(state
);
500 max
= whole_range
.max
;
502 if (min
!= whole_range
.min
)
504 if (max
!= whole_range
.max
)
506 return alloc_estate_range(min
, max
);
509 static struct smatch_state
*decrement_state(struct smatch_state
*state
)
511 long long min
= estate_min(state
);
512 long long max
= estate_max(state
);
515 min
= whole_range
.min
;
517 if (min
!= whole_range
.min
)
519 if (max
!= whole_range
.max
)
521 return alloc_estate_range(min
, max
);
524 static void unop_expr(struct expression
*expr
)
526 struct smatch_state
*state
;
528 if (expr
->smatch_flags
& Handled
)
532 case SPECIAL_INCREMENT
:
533 state
= get_state_expr(SMATCH_EXTRA
, expr
->unop
);
534 state
= increment_state(state
);
535 set_extra_expr_mod(expr
->unop
, state
);
537 case SPECIAL_DECREMENT
:
538 state
= get_state_expr(SMATCH_EXTRA
, expr
->unop
);
539 state
= decrement_state(state
);
540 set_extra_expr_mod(expr
->unop
, state
);
547 static void asm_expr(struct statement
*stmt
)
550 struct expression
*expr
;
553 FOR_EACH_PTR(stmt
->asm_outputs
, expr
) {
555 case 0: /* identifier */
556 case 1: /* constraint */
559 case 2: /* expression */
561 set_extra_expr_mod(expr
, extra_undefined());
564 } END_FOR_EACH_PTR(expr
);
567 static void delete_state_tracker(struct tracker
*t
)
569 remove_from_equiv(t
->name
, t
->sym
);
570 delete_state(t
->owner
, t
->name
, t
->sym
);
573 static void scoped_state_extra(const char *name
, struct symbol
*sym
)
577 t
= alloc_tracker(SMATCH_EXTRA
, name
, sym
);
578 add_scope_hook((scope_hook
*)&delete_state_tracker
, t
);
581 static void match_declarations(struct symbol
*sym
)
586 name
= sym
->ident
->name
;
587 if (!sym
->initializer
) {
588 set_state(SMATCH_EXTRA
, name
, sym
, extra_undefined());
589 scoped_state_extra(name
, sym
);
594 static void check_dereference(struct expression
*expr
)
596 set_extra_expr_nomod(expr
, alloc_estate_range(valid_ptr_min
, valid_ptr_max
));
599 static void match_dereferences(struct expression
*expr
)
601 if (expr
->type
!= EXPR_PREOP
)
603 check_dereference(expr
->unop
);
606 static void match_pointer_as_array(struct expression
*expr
)
610 check_dereference(expr
->unop
->left
);
613 static void set_param_dereferenced(struct expression
*arg
, char *unused
)
615 check_dereference(arg
);
618 static void match_function_def(struct symbol
*sym
)
622 FOR_EACH_PTR(sym
->ctype
.base_type
->arguments
, arg
) {
625 set_state(my_id
, arg
->ident
->name
, arg
, extra_undefined());
626 } END_FOR_EACH_PTR(arg
);
629 static int match_func_comparison(struct expression
*expr
)
631 struct expression
*left
= strip_expr(expr
->left
);
632 struct expression
*right
= strip_expr(expr
->right
);
635 if (left
->type
== EXPR_CALL
) {
636 if (!get_implied_value(right
, &val
))
638 function_comparison(expr
->op
, left
, val
, 1);
642 if (right
->type
== EXPR_CALL
) {
643 if (!get_implied_value(left
, &val
))
645 function_comparison(expr
->op
, right
, val
, 0);
652 static void match_comparison(struct expression
*expr
)
654 struct expression
*left
= strip_expr(expr
->left
);
655 struct expression
*right
= strip_expr(expr
->right
);
656 struct range_list
*left_orig
;
657 struct range_list
*left_true
;
658 struct range_list
*left_false
;
659 struct range_list
*right_orig
;
660 struct range_list
*right_true
;
661 struct range_list
*right_false
;
662 struct smatch_state
*left_true_state
;
663 struct smatch_state
*left_false_state
;
664 struct smatch_state
*right_true_state
;
665 struct smatch_state
*right_false_state
;
667 int right_postop
= 0;
669 if (match_func_comparison(expr
))
672 if (left
->op
== SPECIAL_INCREMENT
|| left
->op
== SPECIAL_DECREMENT
) {
673 if (left
->type
== EXPR_POSTOP
) {
674 left
->smatch_flags
|= Handled
;
675 left_postop
= left
->op
;
677 left
= strip_expr(left
->unop
);
680 if (right
->op
== SPECIAL_INCREMENT
|| right
->op
== SPECIAL_DECREMENT
) {
681 if (right
->type
== EXPR_POSTOP
) {
682 right
->smatch_flags
|= Handled
;
683 right_postop
= right
->op
;
685 right
= strip_expr(right
->unop
);
688 if (!get_implied_range_list(left
, &left_orig
))
689 left_orig
= alloc_range_list(whole_range
.min
, whole_range
.max
);
690 if (!get_implied_range_list(right
, &right_orig
))
691 right_orig
= alloc_range_list(whole_range
.min
, whole_range
.max
);
693 left_true
= clone_range_list(left_orig
);
694 left_false
= clone_range_list(left_orig
);
695 right_true
= clone_range_list(right_orig
);
696 right_false
= clone_range_list(right_orig
);
700 case SPECIAL_UNSIGNED_LT
:
701 if (rl_max(right_orig
) != whole_range
.max
)
702 left_true
= remove_range(left_orig
, rl_max(right_orig
), whole_range
.max
);
703 if (rl_min(right_orig
) != whole_range
.min
)
704 left_false
= remove_range(left_orig
, whole_range
.min
, rl_min(right_orig
) - 1);
706 if (rl_min(left_orig
) != whole_range
.min
)
707 right_true
= remove_range(right_orig
, whole_range
.min
, rl_min(left_orig
));
708 if (rl_max(left_orig
) != whole_range
.max
)
709 right_false
= remove_range(right_orig
, rl_max(left_orig
) + 1, whole_range
.max
);
711 case SPECIAL_UNSIGNED_LTE
:
713 if (rl_max(right_orig
) != whole_range
.max
)
714 left_true
= remove_range(left_orig
, rl_max(right_orig
) + 1, 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
));
718 if (rl_min(left_orig
) != whole_range
.min
)
719 right_true
= remove_range(right_orig
, whole_range
.min
, rl_min(left_orig
) - 1);
720 if (rl_max(left_orig
) != whole_range
.max
)
721 right_false
= remove_range(right_orig
, rl_max(left_orig
), whole_range
.max
);
724 if (rl_max(right_orig
) != whole_range
.max
)
725 left_true
= remove_range(left_true
, rl_max(right_orig
) + 1, whole_range
.max
);
726 if (rl_min(right_orig
) != whole_range
.min
)
727 left_true
= remove_range(left_true
, whole_range
.min
, rl_min(right_orig
) - 1);
728 if (rl_min(right_orig
) == rl_max(right_orig
))
729 left_false
= remove_range(left_orig
, rl_min(right_orig
), rl_min(right_orig
));
731 if (rl_max(left_orig
) != whole_range
.max
)
732 right_true
= remove_range(right_true
, rl_max(left_orig
) + 1, whole_range
.max
);
733 if (rl_min(left_orig
) != whole_range
.min
)
734 right_true
= remove_range(right_true
, whole_range
.min
, rl_min(left_orig
) - 1);
735 if (rl_min(left_orig
) == rl_max(left_orig
))
736 right_false
= remove_range(right_orig
, rl_min(left_orig
), rl_min(left_orig
));
738 case SPECIAL_UNSIGNED_GTE
:
740 if (rl_min(right_orig
) != whole_range
.min
)
741 left_true
= remove_range(left_orig
, whole_range
.min
, rl_min(right_orig
) - 1);
742 if (rl_max(right_orig
) != whole_range
.max
)
743 left_false
= remove_range(left_orig
, rl_max(right_orig
), whole_range
.max
);
745 if (rl_max(left_orig
) != whole_range
.max
)
746 right_true
= remove_range(right_orig
, rl_max(left_orig
) + 1, whole_range
.max
);
747 if (rl_min(left_orig
) != whole_range
.min
)
748 right_false
= remove_range(right_orig
, whole_range
.min
, rl_min(left_orig
));
751 case SPECIAL_UNSIGNED_GT
:
752 if (rl_min(right_orig
) != whole_range
.min
)
753 left_true
= remove_range(left_orig
, whole_range
.min
, rl_min(right_orig
));
754 if (rl_max(right_orig
) != whole_range
.max
)
755 left_false
= remove_range(left_orig
, rl_max(right_orig
) + 1, whole_range
.max
);
757 if (rl_max(left_orig
) != whole_range
.max
)
758 right_true
= remove_range(right_orig
, rl_max(left_orig
), 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
) - 1);
762 case SPECIAL_NOTEQUAL
:
763 if (rl_max(right_orig
) != whole_range
.max
)
764 left_false
= remove_range(left_false
, rl_max(right_orig
) + 1, whole_range
.max
);
765 if (rl_min(right_orig
) != whole_range
.min
)
766 left_false
= remove_range(left_false
, whole_range
.min
, rl_min(right_orig
) - 1);
767 if (rl_min(right_orig
) == rl_max(right_orig
))
768 left_true
= remove_range(left_orig
, rl_min(right_orig
), rl_min(right_orig
));
770 if (rl_max(left_orig
) != whole_range
.max
)
771 right_false
= remove_range(right_false
, rl_max(left_orig
) + 1, whole_range
.max
);
772 if (rl_min(left_orig
) != whole_range
.min
)
773 right_false
= remove_range(right_false
, whole_range
.min
, rl_min(left_orig
) - 1);
774 if (rl_min(left_orig
) == rl_max(left_orig
))
775 right_true
= remove_range(right_orig
, rl_min(left_orig
), rl_min(left_orig
));
781 left_true_state
= alloc_estate_range_list(left_true
);
782 left_false_state
= alloc_estate_range_list(left_false
);
783 right_true_state
= alloc_estate_range_list(right_true
);
784 right_false_state
= alloc_estate_range_list(right_false
);
786 if (left_postop
== SPECIAL_INCREMENT
) {
787 left_true_state
= increment_state(left_true_state
);
788 left_false_state
= increment_state(left_false_state
);
790 if (left_postop
== SPECIAL_DECREMENT
) {
791 left_true_state
= decrement_state(left_true_state
);
792 left_false_state
= decrement_state(left_false_state
);
794 if (right_postop
== SPECIAL_INCREMENT
) {
795 right_true_state
= increment_state(right_true_state
);
796 right_false_state
= increment_state(right_false_state
);
798 if (right_postop
== SPECIAL_DECREMENT
) {
799 right_true_state
= decrement_state(right_true_state
);
800 right_false_state
= decrement_state(right_false_state
);
803 set_extra_expr_true_false(left
, left_true_state
, left_false_state
);
804 set_extra_expr_true_false(right
, right_true_state
, right_false_state
);
807 /* this is actually hooked from smatch_implied.c... it's hacky, yes */
808 void __extra_match_condition(struct expression
*expr
)
812 struct smatch_state
*pre_state
;
813 struct smatch_state
*true_state
;
814 struct smatch_state
*false_state
;
816 expr
= strip_expr(expr
);
817 switch (expr
->type
) {
819 function_comparison(SPECIAL_NOTEQUAL
, expr
, 0, 1);
824 name
= get_variable_from_expr(expr
, &sym
);
827 pre_state
= get_state(my_id
, name
, sym
);
828 true_state
= add_filter(pre_state
, ll_to_sval(0));
829 if (possibly_true(expr
, SPECIAL_EQUAL
, zero_expr()))
830 false_state
= alloc_estate(0);
832 false_state
= alloc_estate_empty();
833 set_extra_true_false(name
, sym
, true_state
, false_state
);
837 match_comparison(expr
);
839 case EXPR_ASSIGNMENT
:
840 __extra_match_condition(expr
->left
);
845 /* returns 1 if it is not possible for expr to be value, otherwise returns 0 */
846 int implied_not_equal(struct expression
*expr
, long long val
)
848 return !possibly_false(expr
, SPECIAL_NOTEQUAL
, value_expr(val
));
851 int get_implied_range_list(struct expression
*expr
, struct range_list
**rl
)
854 struct smatch_state
*state
;
860 expr
= strip_parens(expr
);
864 state
= get_state_expr(my_id
, expr
);
866 *rl
= clone_range_list(estate_ranges(state
));
870 if (expr
->type
== EXPR_CALL
) {
871 struct range_list_sval
*rl_sval
= NULL
;
873 if (get_implied_return_sval(expr
, &rl_sval
)) {
874 *rl
= rl_sval_to_rl(rl_sval
);
877 *rl
= rl_sval_to_rl(db_return_vals(expr
));
881 if (get_implied_value(expr
, &val
)) {
882 add_range(rl
, val
, val
);
886 if (expr
->type
== EXPR_BINOP
&& expr
->op
== '%') {
887 if (!get_implied_value(expr
->right
, &val
))
889 add_range(rl
, 0, val
- 1);
893 if (!get_implied_min(expr
, &min
))
895 if (!get_implied_max(expr
, &max
))
898 *rl
= alloc_range_list(min
, max
);
901 if (is_whole_range_rl(*rl
))
906 int get_implied_range_list_sval(struct expression
*expr
, struct range_list_sval
**rl
)
909 struct smatch_state
*state
;
911 struct range_list
*tmp
;
915 expr
= strip_parens(expr
);
919 state
= get_state_expr(my_id
, expr
);
921 tmp
= clone_range_list(estate_ranges(state
));
922 *rl
= range_list_to_sval(tmp
);
926 if (expr
->type
== EXPR_CALL
) {
927 if (get_implied_return_sval(expr
, rl
))
929 *rl
= db_return_vals(expr
);
933 if (get_implied_value_sval(expr
, &sval
)) {
934 add_range_sval(rl
, sval
, sval
);
938 if (expr
->type
== EXPR_BINOP
&& expr
->op
== '%') {
939 if (!get_implied_value_sval(expr
->right
, &sval
))
941 add_range_sval(rl
, ll_to_sval(0), ll_to_sval(sval
.value
- 1));
945 if (!get_implied_min_sval(expr
, &min
))
947 if (!get_implied_max_sval(expr
, &max
))
950 *rl
= alloc_range_list_sval(min
, max
);
953 if (is_whole_range_rl_sval(*rl
))
958 int is_whole_range(struct smatch_state
*state
)
960 return is_whole_range_rl(estate_ranges(state
));
963 static void struct_member_callback(char *fn
, char *global_static
, int param
, char *printed_name
, struct smatch_state
*state
)
965 if (is_whole_range(state
))
967 sm_msg("info: passes param_value '%s' %d '%s' %s %s", fn
, param
, printed_name
, state
->name
, global_static
);
970 static void match_call_info(struct expression
*expr
)
972 struct range_list
*rl
= NULL
;
973 struct expression
*arg
;
977 name
= get_fnptr_name(expr
->fn
);
981 FOR_EACH_PTR(expr
->args
, arg
) {
982 if (get_implied_range_list(arg
, &rl
) && !is_whole_range_rl(rl
)) {
983 sm_msg("info: passes param_value '%s' %d '$$' %s %s",
984 name
, i
, show_ranges(rl
),
985 is_static(expr
->fn
) ? "static" : "global");
988 } END_FOR_EACH_PTR(arg
);
993 static void set_param_value(const char *name
, struct symbol
*sym
, char *key
, char *value
)
995 struct range_list
*rl
= NULL
;
996 struct smatch_state
*state
;
999 if (strncmp(key
, "$$", 2))
1002 snprintf(fullname
, 256, "%s%s", name
, key
+ 2);
1003 get_value_ranges(value
, &rl
);
1004 state
= alloc_estate_range_list(rl
);
1005 set_state(SMATCH_EXTRA
, fullname
, sym
, state
);
1008 static void match_call_assign(struct expression
*expr
)
1010 if (expr
->op
!= '=')
1013 /* if we have a db set up this gets set in smatch_function_hooks.c */
1015 set_extra_expr_mod(expr
->left
, extra_undefined());
1018 void register_smatch_extra(int id
)
1022 alloc_estate_undefined();
1023 add_merge_hook(my_id
, &merge_func
);
1024 add_unmatched_state_hook(my_id
, &unmatched_state
);
1025 add_hook(&unop_expr
, OP_HOOK
);
1026 add_hook(&asm_expr
, ASM_HOOK
);
1027 add_hook(&match_function_def
, FUNC_DEF_HOOK
);
1028 add_hook(&match_declarations
, DECLARATION_HOOK
);
1030 add_hook(&match_call_info
, FUNCTION_CALL_HOOK
);
1031 add_member_info_callback(my_id
, struct_member_callback
);
1033 add_definition_db_callback(set_param_value
, PARAM_VALUE
);
1036 void register_smatch_extra_late(int id
)
1038 add_hook(&match_dereferences
, DEREF_HOOK
);
1039 add_hook(&match_pointer_as_array
, OP_HOOK
);
1040 add_db_fn_call_callback(DEREFERENCE
, &set_param_dereferenced
);
1041 add_indirect_modification_hook(SMATCH_EXTRA
, reset_struct_members
);
1042 add_hook(&match_function_call
, FUNCTION_CALL_HOOK
);
1043 add_hook(&match_assign
, ASSIGNMENT_HOOK
);
1044 add_hook(&match_call_assign
, CALL_ASSIGNMENT_HOOK
);