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(struct smatch_state
*orig
,
131 sval_t filter_min
, sval_t filter_max
)
133 struct range_list_sval
*rl
;
136 orig
= extra_undefined(filter_min
.type
);
138 rl
= remove_range_sval(estate_ranges_sval(orig
), filter_min
, filter_max
);
139 return alloc_estate_range_list_sval(rl
);
142 struct smatch_state
*add_filter(struct smatch_state
*orig
, sval_t sval
)
144 return filter_range(orig
, sval
, sval
);
147 static struct smatch_state
*merge_func(struct smatch_state
*s1
, struct smatch_state
*s2
)
149 struct smatch_state
*tmp
;
150 struct range_list_sval
*value_ranges
;
151 struct related_list
*rlist
;
153 if (estates_equiv(s1
, s2
))
156 value_ranges
= range_list_union_sval(estate_ranges_sval(s1
), estate_ranges_sval(s2
));
157 tmp
= alloc_estate_range_list_sval(value_ranges
);
158 rlist
= get_shared_relations(estate_related(s1
), estate_related(s2
));
159 set_related(tmp
, rlist
);
160 if (estate_has_hard_max(s1
) && estate_has_hard_max(s2
))
161 estate_set_hard_max(tmp
);
166 static struct sm_state
*handle_canonical_while_count_down(struct statement
*loop
)
168 struct expression
*iter_var
;
169 struct expression
*condition
;
171 struct smatch_state
*estate
;
174 condition
= strip_expr(loop
->iterator_pre_condition
);
177 if (condition
->type
!= EXPR_PREOP
&& condition
->type
!= EXPR_POSTOP
)
179 if (condition
->op
!= SPECIAL_DECREMENT
)
182 iter_var
= condition
->unop
;
183 sm
= get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
186 if (sval_cmp_val(estate_min_sval(sm
->state
), 0) < 0)
188 start
= estate_max_sval(sm
->state
);
189 if (sval_cmp_val(start
, 0) <= 0)
191 if (!sval_is_max(start
))
194 if (condition
->type
== EXPR_PREOP
) {
195 estate
= alloc_estate_range_sval(sval_type_val(start
.type
, 1), start
);
196 if (!sval_is_max(start
))
197 estate_set_hard_max(estate
);
198 set_extra_expr_mod(iter_var
, estate
);
200 if (condition
->type
== EXPR_POSTOP
) {
201 estate
= alloc_estate_range_sval(sval_type_val(start
.type
, 0), start
);
202 if (!sval_is_max(start
))
203 estate_set_hard_max(estate
);
204 set_extra_expr_mod(iter_var
, estate
);
206 return get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
209 static struct sm_state
*handle_canonical_for_inc(struct expression
*iter_expr
,
210 struct expression
*condition
)
212 struct expression
*iter_var
;
214 struct smatch_state
*estate
;
217 iter_var
= iter_expr
->unop
;
218 sm
= get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
221 if (!estate_get_single_value_sval(sm
->state
, &start
))
223 if (!get_implied_value_sval(condition
->right
, &end
))
224 end
= sval_type_max(get_type(iter_var
));
226 if (get_sm_state_expr(SMATCH_EXTRA
, condition
->left
) != sm
)
229 switch (condition
->op
) {
230 case SPECIAL_NOTEQUAL
:
232 if (!sval_is_max(end
))
240 if (sval_cmp(end
, start
) < 0)
242 estate
= alloc_estate_range_sval(start
, end
);
243 if (!sval_is_max(end
))
244 estate_set_hard_max(estate
);
245 set_extra_expr_mod(iter_var
, estate
);
246 return get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
249 static struct sm_state
*handle_canonical_for_dec(struct expression
*iter_expr
,
250 struct expression
*condition
)
252 struct expression
*iter_var
;
254 struct smatch_state
*estate
;
257 iter_var
= iter_expr
->unop
;
258 sm
= get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
261 if (!estate_get_single_value_sval(sm
->state
, &start
))
263 if (!get_implied_value_sval(condition
->right
, &end
))
264 end
= sval_type_min(get_type(iter_var
));
265 if (get_sm_state_expr(SMATCH_EXTRA
, condition
->left
) != sm
)
268 switch (condition
->op
) {
269 case SPECIAL_NOTEQUAL
:
271 if (!sval_is_min(end
) && !sval_is_max(end
))
279 if (sval_cmp(end
, start
) > 0)
281 estate
= alloc_estate_range_sval(end
, start
);
282 estate_set_hard_max(estate
);
283 set_extra_expr_mod(iter_var
, estate
);
284 return get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
287 static struct sm_state
*handle_canonical_for_loops(struct statement
*loop
)
289 struct expression
*iter_expr
;
290 struct expression
*condition
;
292 if (!loop
->iterator_post_statement
)
294 if (loop
->iterator_post_statement
->type
!= STMT_EXPRESSION
)
296 iter_expr
= loop
->iterator_post_statement
->expression
;
297 if (!loop
->iterator_pre_condition
)
299 if (loop
->iterator_pre_condition
->type
!= EXPR_COMPARE
)
301 condition
= loop
->iterator_pre_condition
;
303 if (iter_expr
->op
== SPECIAL_INCREMENT
)
304 return handle_canonical_for_inc(iter_expr
, condition
);
305 if (iter_expr
->op
== SPECIAL_DECREMENT
)
306 return handle_canonical_for_dec(iter_expr
, condition
);
310 struct sm_state
*__extra_handle_canonical_loops(struct statement
*loop
, struct state_list
**slist
)
312 struct sm_state
*ret
;
314 __push_fake_cur_slist();
315 if (!loop
->iterator_post_statement
)
316 ret
= handle_canonical_while_count_down(loop
);
318 ret
= handle_canonical_for_loops(loop
);
319 *slist
= __pop_fake_cur_slist();
323 int __iterator_unchanged(struct sm_state
*sm
)
327 if (get_sm_state(my_id
, sm
->name
, sm
->sym
) == sm
)
332 static void while_count_down_after(struct sm_state
*sm
, struct expression
*condition
)
336 /* paranoid checking. prolly not needed */
337 condition
= strip_expr(condition
);
340 if (condition
->type
!= EXPR_PREOP
&& condition
->type
!= EXPR_POSTOP
)
342 if (condition
->op
!= SPECIAL_DECREMENT
)
344 after_value
= estate_min_sval(sm
->state
);
346 set_extra_mod(sm
->name
, sm
->sym
, alloc_estate_sval(after_value
));
349 void __extra_pre_loop_hook_after(struct sm_state
*sm
,
350 struct statement
*iterator
,
351 struct expression
*condition
)
353 struct expression
*iter_expr
;
358 struct smatch_state
*state
;
362 while_count_down_after(sm
, condition
);
366 iter_expr
= iterator
->expression
;
368 if (condition
->type
!= EXPR_COMPARE
)
370 if (!get_value_sval(condition
->left
, &value
)) {
371 if (!get_value_sval(condition
->right
, &value
))
376 name
= get_variable_from_expr(condition
->left
, &sym
);
378 name
= get_variable_from_expr(condition
->right
, &sym
);
381 if (sym
!= sm
->sym
|| strcmp(name
, sm
->name
))
383 state
= get_state(my_id
, name
, sym
);
384 min
= estate_min_sval(state
);
385 max
= estate_max_sval(state
);
386 if (iter_expr
->op
== SPECIAL_INCREMENT
&&
387 !sval_is_min(min
) && sval_is_max(max
))
388 set_extra_mod(name
, sym
, alloc_estate_sval(min
));
389 else if (sval_is_min(min
) && !sval_is_max(max
))
390 set_extra_mod(name
, sym
, alloc_estate_sval(max
));
397 static struct smatch_state
*unmatched_state(struct sm_state
*sm
)
399 return extra_undefined(estate_type(sm
->state
));
402 static void match_function_call(struct expression
*expr
)
404 struct expression
*arg
;
405 struct expression
*tmp
;
407 FOR_EACH_PTR(expr
->args
, arg
) {
408 tmp
= strip_expr(arg
);
409 if (tmp
->type
== EXPR_PREOP
&& tmp
->op
== '&') {
410 remove_from_equiv_expr(tmp
->unop
);
411 set_state_expr(SMATCH_EXTRA
, tmp
->unop
, extra_undefined(get_type(tmp
->unop
)));
413 } END_FOR_EACH_PTR(arg
);
416 static int types_equiv_or_pointer(struct symbol
*one
, struct symbol
*two
)
420 if (one
->type
== SYM_PTR
&& two
->type
== SYM_PTR
)
422 return types_equiv(one
, two
);
425 static void match_assign(struct expression
*expr
)
427 struct range_list_sval
*rl
= NULL
;
428 struct expression
*left
;
429 struct expression
*right
;
430 struct symbol
*right_sym
;
436 sval_t right_min
, right_max
;
439 if (__is_condition_assign(expr
))
441 left
= strip_expr(expr
->left
);
442 name
= get_variable_from_expr(left
, &sym
);
445 right
= strip_parens(expr
->right
);
446 while (right
->type
== EXPR_ASSIGNMENT
&& right
->op
== '=')
447 right
= strip_parens(right
->left
);
449 if (expr
->op
== '=' && right
->type
== EXPR_CALL
)
450 return; /* these are handled in match_call_assign() */
452 right_name
= get_variable_from_expr(right
, &right_sym
);
453 if (expr
->op
== '=' && right_name
&& right_sym
&&
454 types_equiv_or_pointer(get_type(expr
->left
), get_type(expr
->right
))) {
455 set_equiv(left
, right
);
459 right_min
= sval_type_min(get_type(expr
->right
));
460 right_max
= sval_type_max(get_type(expr
->right
));
462 known
= get_implied_value_sval(right
, &value
);
465 if (get_implied_range_list_sval(right
, &rl
)) {
466 rl
= cast_rl(rl
, get_type(expr
->left
));
467 set_extra_mod(name
, sym
, alloc_estate_range_list_sval(rl
));
473 case SPECIAL_ADD_ASSIGN
:
474 if (get_implied_min_sval(left
, &tmp
)) {
476 right_min
= sval_binop(tmp
, '+', value
);
480 if (!inside_loop() && known
&& get_implied_max_sval(left
, &tmp
))
481 right_max
= sval_binop(tmp
, '+', value
);
483 case SPECIAL_SUB_ASSIGN
:
484 if (get_implied_max_sval(left
, &tmp
)) {
486 right_max
= sval_binop(tmp
, '-', value
);
490 if (!inside_loop() && known
&& get_implied_min_sval(left
, &tmp
))
491 right_min
= sval_binop(tmp
, '-', value
);
494 if (!sval_is_min(right_min
) || !sval_is_max(right_max
))
495 rl
= cast_rl(alloc_range_list_sval(right_min
, right_max
), get_type(expr
->left
));
497 rl
= whole_range_list_sval(get_type(expr
->left
));
498 set_extra_mod(name
, sym
, alloc_estate_range_list_sval(rl
));
500 free_string(right_name
);
504 static void reset_struct_members(struct sm_state
*sm
)
506 set_extra_mod(sm
->name
, sm
->sym
, extra_undefined(estate_type(sm
->state
)));
509 static struct smatch_state
*increment_state(struct smatch_state
*state
)
511 sval_t min
= estate_min_sval(state
);
512 sval_t max
= estate_max_sval(state
);
515 max
= sval_type_max(max
.type
);
517 if (!sval_is_min(min
) && !sval_is_max(min
))
519 if (!sval_is_min(max
) && !sval_is_max(max
))
521 return alloc_estate_range_sval(min
, max
);
524 static struct smatch_state
*decrement_state(struct smatch_state
*state
)
526 sval_t min
= estate_min_sval(state
);
527 sval_t max
= estate_max_sval(state
);
530 min
= sval_type_min(min
.type
);
532 if (!sval_is_min(min
) && !sval_is_max(min
))
534 if (!sval_is_min(max
) && !sval_is_max(max
))
536 return alloc_estate_range_sval(min
, max
);
539 static void unop_expr(struct expression
*expr
)
541 struct smatch_state
*state
;
543 if (expr
->smatch_flags
& Handled
)
547 case SPECIAL_INCREMENT
:
548 state
= get_state_expr(SMATCH_EXTRA
, expr
->unop
);
549 state
= increment_state(state
);
550 set_extra_expr_mod(expr
->unop
, state
);
552 case SPECIAL_DECREMENT
:
553 state
= get_state_expr(SMATCH_EXTRA
, expr
->unop
);
554 state
= decrement_state(state
);
555 set_extra_expr_mod(expr
->unop
, state
);
562 static void asm_expr(struct statement
*stmt
)
565 struct expression
*expr
;
568 FOR_EACH_PTR(stmt
->asm_outputs
, expr
) {
570 case 0: /* identifier */
571 case 1: /* constraint */
574 case 2: /* expression */
576 set_extra_expr_mod(expr
, extra_undefined(get_type(expr
)));
579 } END_FOR_EACH_PTR(expr
);
582 static void delete_state_tracker(struct tracker
*t
)
584 remove_from_equiv(t
->name
, t
->sym
);
585 delete_state(t
->owner
, t
->name
, t
->sym
);
588 static void scoped_state_extra(const char *name
, struct symbol
*sym
)
592 t
= alloc_tracker(SMATCH_EXTRA
, name
, sym
);
593 add_scope_hook((scope_hook
*)&delete_state_tracker
, t
);
596 static void match_declarations(struct symbol
*sym
)
601 name
= sym
->ident
->name
;
602 if (!sym
->initializer
) {
603 set_state(SMATCH_EXTRA
, name
, sym
, extra_undefined(get_real_base_type(sym
)));
604 scoped_state_extra(name
, sym
);
609 static void check_dereference(struct expression
*expr
)
611 set_extra_expr_nomod(expr
, alloc_estate_range_sval(valid_ptr_min_sval
, valid_ptr_max_sval
));
614 static void match_dereferences(struct expression
*expr
)
616 if (expr
->type
!= EXPR_PREOP
)
618 check_dereference(expr
->unop
);
621 static void match_pointer_as_array(struct expression
*expr
)
625 check_dereference(expr
->unop
->left
);
628 static void set_param_dereferenced(struct expression
*arg
, char *unused
)
630 check_dereference(arg
);
633 static void match_function_def(struct symbol
*sym
)
637 FOR_EACH_PTR(sym
->ctype
.base_type
->arguments
, arg
) {
640 set_state(my_id
, arg
->ident
->name
, arg
, extra_undefined(get_real_base_type(arg
)));
641 } END_FOR_EACH_PTR(arg
);
644 static int match_func_comparison(struct expression
*expr
)
646 struct expression
*left
= strip_expr(expr
->left
);
647 struct expression
*right
= strip_expr(expr
->right
);
650 if (left
->type
== EXPR_CALL
) {
651 if (!get_implied_value_sval(right
, &sval
))
653 function_comparison(expr
->op
, left
, sval
, 1);
657 if (right
->type
== EXPR_CALL
) {
658 if (!get_implied_value_sval(left
, &sval
))
660 function_comparison(expr
->op
, right
, sval
, 0);
667 static sval_t
add_one(sval_t sval
)
673 static sval_t
sub_one(sval_t sval
)
679 static void match_comparison(struct expression
*expr
)
681 struct expression
*left
= strip_expr(expr
->left
);
682 struct expression
*right
= strip_expr(expr
->right
);
684 struct range_list_sval
*left_orig
;
685 struct range_list_sval
*left_true
;
686 struct range_list_sval
*left_false
;
687 struct range_list_sval
*right_orig
;
688 struct range_list_sval
*right_true
;
689 struct range_list_sval
*right_false
;
690 struct smatch_state
*left_true_state
;
691 struct smatch_state
*left_false_state
;
692 struct smatch_state
*right_true_state
;
693 struct smatch_state
*right_false_state
;
694 sval_t min
, max
, dummy
;
696 int right_postop
= 0;
698 if (match_func_comparison(expr
))
701 if (left
->op
== SPECIAL_INCREMENT
|| left
->op
== SPECIAL_DECREMENT
) {
702 if (left
->type
== EXPR_POSTOP
) {
703 left
->smatch_flags
|= Handled
;
704 left_postop
= left
->op
;
706 left
= strip_expr(left
->unop
);
708 while (left
->type
== EXPR_ASSIGNMENT
)
709 left
= strip_expr(left
->left
);
711 if (right
->op
== SPECIAL_INCREMENT
|| right
->op
== SPECIAL_DECREMENT
) {
712 if (right
->type
== EXPR_POSTOP
) {
713 right
->smatch_flags
|= Handled
;
714 right_postop
= right
->op
;
716 right
= strip_expr(right
->unop
);
719 type
= get_type(expr
);
721 sm_msg("debug: failed to get type for '%s'", get_variable_from_expr_complex(expr
, NULL
));
725 if (get_implied_range_list_sval(left
, &left_orig
)) {
726 left_orig
= cast_rl(left_orig
, type
);
728 min
= sval_type_min(get_type(left
));
729 max
= sval_type_max(get_type(left
));
730 left_orig
= cast_rl(alloc_range_list_sval(min
, max
), type
);
733 if (get_implied_range_list_sval(right
, &right_orig
)) {
734 right_orig
= cast_rl(right_orig
, type
);
736 min
= sval_type_min(get_type(right
));
737 max
= sval_type_max(get_type(right
));
738 right_orig
= cast_rl(alloc_range_list_sval(min
, max
), type
);
740 min
= sval_type_min(type
);
741 max
= sval_type_max(type
);
743 left_true
= clone_range_list_sval(left_orig
);
744 left_false
= clone_range_list_sval(left_orig
);
745 right_true
= clone_range_list_sval(right_orig
);
746 right_false
= clone_range_list_sval(right_orig
);
750 case SPECIAL_UNSIGNED_LT
:
751 if (!sval_is_max(rl_max_sval(right_orig
))) {
752 left_true
= remove_range_sval(left_orig
, rl_max_sval(right_orig
), max
);
754 if (!sval_is_min(rl_min_sval(right_orig
))) {
755 left_false
= remove_range_sval(left_orig
, min
, sub_one(rl_min_sval(right_orig
)));
758 if (!sval_is_min(rl_min_sval(left_orig
)))
759 right_true
= remove_range_sval(right_orig
, min
, rl_min_sval(left_orig
));
760 if (!sval_is_max(rl_max_sval(left_orig
)))
761 right_false
= remove_range_sval(right_orig
, add_one(rl_max_sval(left_orig
)), max
);
763 case SPECIAL_UNSIGNED_LTE
:
765 if (!sval_is_max(rl_max_sval(right_orig
)))
766 left_true
= remove_range_sval(left_orig
, add_one(rl_max_sval(right_orig
)), max
);
767 if (!sval_is_min(rl_min_sval(right_orig
)))
768 left_false
= remove_range_sval(left_orig
, min
, rl_min_sval(right_orig
));
770 if (!sval_is_min(rl_min_sval(left_orig
)))
771 right_true
= remove_range_sval(right_orig
, min
, sub_one(rl_min_sval(left_orig
)));
772 if (!sval_is_max(rl_max_sval(left_orig
)))
773 right_false
= remove_range_sval(right_orig
, rl_max_sval(left_orig
), max
);
776 if (!sval_is_max(rl_max_sval(right_orig
))) {
777 left_true
= remove_range_sval(left_true
, add_one(rl_max_sval(right_orig
)), max
);
779 if (!sval_is_min(rl_min_sval(right_orig
))) {
780 left_true
= remove_range_sval(left_true
, min
, sub_one(rl_min_sval(right_orig
)));
782 if (sval_cmp(rl_min_sval(right_orig
), rl_max_sval(right_orig
)) == 0)
783 left_false
= remove_range_sval(left_orig
, rl_min_sval(right_orig
), rl_min_sval(right_orig
));
785 if (!sval_is_max(rl_max_sval(left_orig
)))
786 right_true
= remove_range_sval(right_true
, add_one(rl_max_sval(left_orig
)), max
);
787 if (!sval_is_min(rl_min_sval(left_orig
)))
788 right_true
= remove_range_sval(right_true
, min
, sub_one(rl_min_sval(left_orig
)));
789 if (sval_cmp(rl_min_sval(left_orig
), rl_max_sval(left_orig
)) == 0)
790 right_false
= remove_range_sval(right_orig
, rl_min_sval(left_orig
), rl_min_sval(left_orig
));
792 case SPECIAL_UNSIGNED_GTE
:
794 if (!sval_is_min(rl_min_sval(right_orig
)))
795 left_true
= remove_range_sval(left_orig
, min
, sub_one(rl_min_sval(right_orig
)));
796 if (!sval_is_max(rl_max_sval(right_orig
)))
797 left_false
= remove_range_sval(left_orig
, rl_max_sval(right_orig
), max
);
799 if (!sval_is_max(rl_max_sval(left_orig
)))
800 right_true
= remove_range_sval(right_orig
, add_one(rl_max_sval(left_orig
)), max
);
801 if (!sval_is_min(rl_min_sval(left_orig
)))
802 right_false
= remove_range_sval(right_orig
, min
, rl_min_sval(left_orig
));
805 case SPECIAL_UNSIGNED_GT
:
806 if (!sval_is_min(rl_min_sval(right_orig
)))
807 left_true
= remove_range_sval(left_orig
, min
, rl_min_sval(right_orig
));
808 if (!sval_is_max(rl_max_sval(right_orig
)))
809 left_false
= remove_range_sval(left_orig
, add_one(rl_max_sval(right_orig
)), max
);
811 if (!sval_is_max(rl_max_sval(left_orig
)))
812 right_true
= remove_range_sval(right_orig
, rl_max_sval(left_orig
), max
);
813 if (!sval_is_min(rl_min_sval(left_orig
)))
814 right_false
= remove_range_sval(right_orig
, min
, sub_one(rl_min_sval(left_orig
)));
816 case SPECIAL_NOTEQUAL
:
817 if (!sval_is_max(rl_max_sval(right_orig
)))
818 left_false
= remove_range_sval(left_false
, add_one(rl_max_sval(right_orig
)), max
);
819 if (!sval_is_min(rl_min_sval(right_orig
)))
820 left_false
= remove_range_sval(left_false
, min
, sub_one(rl_min_sval(right_orig
)));
821 if (sval_cmp(rl_min_sval(right_orig
), rl_max_sval(right_orig
)) == 0)
822 left_true
= remove_range_sval(left_orig
, rl_min_sval(right_orig
), rl_min_sval(right_orig
));
824 if (!sval_is_max(rl_max_sval(left_orig
)))
825 right_false
= remove_range_sval(right_false
, add_one(rl_max_sval(left_orig
)), max
);
826 if (!sval_is_min(rl_min_sval(left_orig
)))
827 right_false
= remove_range_sval(right_false
, min
, sub_one(rl_min_sval(left_orig
)));
828 if (sval_cmp(rl_min_sval(left_orig
), rl_max_sval(left_orig
)) == 0)
829 right_true
= remove_range_sval(right_orig
, rl_min_sval(left_orig
), rl_min_sval(left_orig
));
835 left_true_state
= alloc_estate_range_list_sval(cast_rl(left_true
, get_type(left
)));
836 left_false_state
= alloc_estate_range_list_sval(cast_rl(left_false
, get_type(left
)));
837 right_true_state
= alloc_estate_range_list_sval(cast_rl(right_true
, get_type(right
)));
838 right_false_state
= alloc_estate_range_list_sval(cast_rl(right_false
, get_type(right
)));
842 case SPECIAL_UNSIGNED_LT
:
843 case SPECIAL_UNSIGNED_LTE
:
845 if (get_hard_max(right
, &dummy
))
846 estate_set_hard_max(left_true_state
);
847 if (get_hard_max(left
, &dummy
))
848 estate_set_hard_max(right_false_state
);
851 case SPECIAL_UNSIGNED_GT
:
852 case SPECIAL_UNSIGNED_GTE
:
854 if (get_hard_max(left
, &dummy
))
855 estate_set_hard_max(right_true_state
);
856 if (get_hard_max(right
, &dummy
))
857 estate_set_hard_max(left_false_state
);
861 if (get_hard_max(left
, &dummy
)) {
862 estate_set_hard_max(left_true_state
);
863 estate_set_hard_max(left_false_state
);
865 if (get_hard_max(right
, &dummy
)) {
866 estate_set_hard_max(right_true_state
);
867 estate_set_hard_max(right_false_state
);
870 if (left_postop
== SPECIAL_INCREMENT
) {
871 left_true_state
= increment_state(left_true_state
);
872 left_false_state
= increment_state(left_false_state
);
874 if (left_postop
== SPECIAL_DECREMENT
) {
875 left_true_state
= decrement_state(left_true_state
);
876 left_false_state
= decrement_state(left_false_state
);
878 if (right_postop
== SPECIAL_INCREMENT
) {
879 right_true_state
= increment_state(right_true_state
);
880 right_false_state
= increment_state(right_false_state
);
882 if (right_postop
== SPECIAL_DECREMENT
) {
883 right_true_state
= decrement_state(right_true_state
);
884 right_false_state
= decrement_state(right_false_state
);
887 set_extra_expr_true_false(left
, left_true_state
, left_false_state
);
888 set_extra_expr_true_false(right
, right_true_state
, right_false_state
);
891 /* this is actually hooked from smatch_implied.c... it's hacky, yes */
892 void __extra_match_condition(struct expression
*expr
)
896 struct smatch_state
*pre_state
;
897 struct smatch_state
*true_state
;
898 struct smatch_state
*false_state
;
900 expr
= strip_expr(expr
);
901 switch (expr
->type
) {
903 function_comparison(SPECIAL_NOTEQUAL
, expr
, ll_to_sval(0), 1);
910 zero
= sval_blank(expr
);
913 name
= get_variable_from_expr(expr
, &sym
);
916 pre_state
= get_state(my_id
, name
, sym
);
917 true_state
= add_filter(pre_state
, zero
);
918 if (possibly_true(expr
, SPECIAL_EQUAL
, zero_expr()))
919 false_state
= alloc_estate_sval(zero
);
921 false_state
= alloc_estate_empty();
922 set_extra_true_false(name
, sym
, true_state
, false_state
);
927 match_comparison(expr
);
929 case EXPR_ASSIGNMENT
:
930 __extra_match_condition(expr
->left
);
935 /* returns 1 if it is not possible for expr to be value, otherwise returns 0 */
936 int implied_not_equal(struct expression
*expr
, long long val
)
938 return !possibly_false(expr
, SPECIAL_NOTEQUAL
, value_expr(val
));
941 int get_implied_range_list_sval(struct expression
*expr
, struct range_list_sval
**rl
)
944 struct smatch_state
*state
;
949 expr
= strip_parens(expr
);
953 state
= get_state_expr(my_id
, expr
);
955 *rl
= clone_range_list_sval(estate_ranges_sval(state
));
959 if (expr
->type
== EXPR_CALL
) {
960 if (get_implied_return_sval(expr
, rl
))
962 *rl
= db_return_vals(expr
);
966 if (get_implied_value_sval(expr
, &sval
)) {
967 add_range_sval(rl
, sval
, sval
);
971 if (expr
->type
== EXPR_BINOP
&& expr
->op
== '%') {
972 if (!get_implied_value_sval(expr
->right
, &sval
))
974 add_range_sval(rl
, ll_to_sval(0), ll_to_sval(sval
.value
- 1));
978 if (!get_implied_min_sval(expr
, &min
))
980 if (!get_implied_max_sval(expr
, &max
))
983 *rl
= alloc_range_list_sval(min
, max
);
986 if (is_whole_range_rl_sval(*rl
))
991 int is_whole_range(struct smatch_state
*state
)
993 return is_whole_range_rl_sval(estate_ranges_sval(state
));
996 static void struct_member_callback(char *fn
, char *global_static
, int param
, char *printed_name
, struct smatch_state
*state
)
998 if (is_whole_range(state
))
1000 sm_msg("info: passes param_value '%s' %d '%s' %s %s", fn
, param
, printed_name
, state
->name
, global_static
);
1003 static void match_call_info(struct expression
*expr
)
1005 struct range_list_sval
*rl
= NULL
;
1006 struct expression
*arg
;
1010 name
= get_fnptr_name(expr
->fn
);
1014 FOR_EACH_PTR(expr
->args
, arg
) {
1015 if (get_implied_range_list_sval(arg
, &rl
) && !is_whole_range_rl_sval(rl
)) {
1016 sm_msg("info: passes param_value '%s' %d '$$' %s %s",
1017 name
, i
, show_ranges_sval(rl
),
1018 is_static(expr
->fn
) ? "static" : "global");
1021 } END_FOR_EACH_PTR(arg
);
1026 static void set_param_value(const char *name
, struct symbol
*sym
, char *key
, char *value
)
1028 struct range_list_sval
*rl
= NULL
;
1029 struct smatch_state
*state
;
1032 if (strncmp(key
, "$$", 2))
1035 snprintf(fullname
, 256, "%s%s", name
, key
+ 2);
1036 get_value_ranges_type(get_real_base_type(sym
), value
, &rl
);
1037 rl
= cast_rl(rl
, get_real_base_type(sym
));
1038 state
= alloc_estate_range_list_sval(rl
);
1039 set_state(SMATCH_EXTRA
, fullname
, sym
, state
);
1042 static void match_call_assign(struct expression
*expr
)
1044 if (expr
->op
!= '=')
1047 /* if we have a db set up this gets set in smatch_function_hooks.c */
1049 set_extra_expr_mod(expr
->left
, extra_undefined(get_type(expr
->left
)));
1052 void register_smatch_extra(int id
)
1056 add_merge_hook(my_id
, &merge_func
);
1057 add_unmatched_state_hook(my_id
, &unmatched_state
);
1058 add_hook(&unop_expr
, OP_HOOK
);
1059 add_hook(&asm_expr
, ASM_HOOK
);
1060 add_hook(&match_function_def
, FUNC_DEF_HOOK
);
1061 add_hook(&match_declarations
, DECLARATION_HOOK
);
1063 add_hook(&match_call_info
, FUNCTION_CALL_HOOK
);
1064 add_member_info_callback(my_id
, struct_member_callback
);
1066 add_definition_db_callback(set_param_value
, PARAM_VALUE
);
1069 void register_smatch_extra_late(int id
)
1071 add_hook(&match_dereferences
, DEREF_HOOK
);
1072 add_hook(&match_pointer_as_array
, OP_HOOK
);
1073 add_db_fn_call_callback(DEREFERENCE
, &set_param_dereferenced
);
1074 add_indirect_modification_hook(SMATCH_EXTRA
, reset_struct_members
);
1075 add_hook(&match_function_call
, FUNCTION_CALL_HOOK
);
1076 add_hook(&match_assign
, ASSIGNMENT_HOOK
);
1077 add_hook(&match_call_assign
, CALL_ASSIGNMENT_HOOK
);