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
*rl
;
136 orig
= extra_undefined(filter_min
.type
);
138 rl
= remove_range(estate_ranges(orig
), filter_min
, filter_max
);
139 return alloc_estate_range_list(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
*value_ranges
;
151 struct related_list
*rlist
;
153 if (estates_equiv(s1
, s2
))
156 value_ranges
= range_list_union(estate_ranges(s1
), estate_ranges(s2
));
157 tmp
= alloc_estate_range_list(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(sm
->state
), 0) < 0)
188 start
= estate_max(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_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_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(sm
->state
, &start
))
223 if (!get_implied_value(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(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(sm
->state
, &start
))
263 if (!get_implied_value(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(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(sm
->state
);
346 set_extra_mod(sm
->name
, sm
->sym
, alloc_estate(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(condition
->left
, &value
)) {
371 if (!get_value(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(state
);
385 max
= estate_max(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(min
));
389 else if (sval_is_min(min
) && !sval_is_max(max
))
390 set_extra_mod(name
, sym
, alloc_estate(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
*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(right
, &value
);
465 struct smatch_state
*state
;
467 if (get_implied_range_list(right
, &rl
)) {
468 rl
= cast_rl(get_type(expr
->left
), rl
);
469 state
= alloc_estate_range_list(rl
);
470 if (get_hard_max(right
, &tmp
))
471 estate_set_hard_max(state
);
473 rl
= whole_range_list(get_type(right
));
474 rl
= cast_rl(get_type(expr
->left
), rl
);
475 state
= alloc_estate_range_list(rl
);
477 set_extra_mod(name
, sym
, state
);
480 case SPECIAL_ADD_ASSIGN
:
481 if (get_implied_min(left
, &tmp
)) {
483 right_min
= sval_binop(tmp
, '+', value
);
487 if (!inside_loop() && known
&& get_implied_max(left
, &tmp
))
488 right_max
= sval_binop(tmp
, '+', value
);
490 case SPECIAL_SUB_ASSIGN
:
491 if (get_implied_max(left
, &tmp
)) {
493 right_max
= sval_binop(tmp
, '-', value
);
497 if (!inside_loop() && known
&& get_implied_min(left
, &tmp
))
498 right_min
= sval_binop(tmp
, '-', value
);
501 if (!sval_is_min(right_min
) || !sval_is_max(right_max
))
502 rl
= cast_rl(get_type(expr
->left
), alloc_range_list(right_min
, right_max
));
504 rl
= whole_range_list(get_type(expr
->left
));
505 set_extra_mod(name
, sym
, alloc_estate_range_list(rl
));
507 free_string(right_name
);
511 static void reset_struct_members(struct sm_state
*sm
)
513 set_extra_mod(sm
->name
, sm
->sym
, extra_undefined(estate_type(sm
->state
)));
516 static struct smatch_state
*increment_state(struct smatch_state
*state
)
518 sval_t min
= estate_min(state
);
519 sval_t max
= estate_max(state
);
521 if (!estate_ranges(state
))
525 max
= sval_type_max(max
.type
);
527 if (!sval_is_min(min
) && !sval_is_max(min
))
529 if (!sval_is_min(max
) && !sval_is_max(max
))
531 return alloc_estate_range(min
, max
);
534 static struct smatch_state
*decrement_state(struct smatch_state
*state
)
536 sval_t min
= estate_min(state
);
537 sval_t max
= estate_max(state
);
539 if (!estate_ranges(state
))
543 min
= sval_type_min(min
.type
);
545 if (!sval_is_min(min
) && !sval_is_max(min
))
547 if (!sval_is_min(max
) && !sval_is_max(max
))
549 return alloc_estate_range(min
, max
);
552 static void unop_expr(struct expression
*expr
)
554 struct smatch_state
*state
;
556 if (expr
->smatch_flags
& Handled
)
560 case SPECIAL_INCREMENT
:
561 state
= get_state_expr(SMATCH_EXTRA
, expr
->unop
);
562 state
= increment_state(state
);
564 state
= extra_undefined(get_type(expr
));
565 set_extra_expr_mod(expr
->unop
, state
);
567 case SPECIAL_DECREMENT
:
568 state
= get_state_expr(SMATCH_EXTRA
, expr
->unop
);
569 state
= decrement_state(state
);
571 state
= extra_undefined(get_type(expr
));
572 set_extra_expr_mod(expr
->unop
, state
);
579 static void asm_expr(struct statement
*stmt
)
582 struct expression
*expr
;
585 FOR_EACH_PTR(stmt
->asm_outputs
, expr
) {
587 case 0: /* identifier */
588 case 1: /* constraint */
591 case 2: /* expression */
593 set_extra_expr_mod(expr
, extra_undefined(get_type(expr
)));
596 } END_FOR_EACH_PTR(expr
);
599 static void delete_state_tracker(struct tracker
*t
)
601 remove_from_equiv(t
->name
, t
->sym
);
602 delete_state(t
->owner
, t
->name
, t
->sym
);
605 static void scoped_state_extra(const char *name
, struct symbol
*sym
)
609 t
= alloc_tracker(SMATCH_EXTRA
, name
, sym
);
610 add_scope_hook((scope_hook
*)&delete_state_tracker
, t
);
613 static void match_declarations(struct symbol
*sym
)
618 name
= sym
->ident
->name
;
619 if (!sym
->initializer
) {
620 set_state(SMATCH_EXTRA
, name
, sym
, extra_undefined(get_real_base_type(sym
)));
621 scoped_state_extra(name
, sym
);
626 static void check_dereference(struct expression
*expr
)
628 set_extra_expr_nomod(expr
, alloc_estate_range(valid_ptr_min_sval
, valid_ptr_max_sval
));
631 static void match_dereferences(struct expression
*expr
)
633 if (expr
->type
!= EXPR_PREOP
)
635 check_dereference(expr
->unop
);
638 static void match_pointer_as_array(struct expression
*expr
)
642 check_dereference(expr
->unop
->left
);
645 static void set_param_dereferenced(struct expression
*arg
, char *unused
)
647 check_dereference(arg
);
650 static void match_function_def(struct symbol
*sym
)
654 FOR_EACH_PTR(sym
->ctype
.base_type
->arguments
, arg
) {
657 set_state(my_id
, arg
->ident
->name
, arg
, extra_undefined(get_real_base_type(arg
)));
658 } END_FOR_EACH_PTR(arg
);
661 static int match_func_comparison(struct expression
*expr
)
663 struct expression
*left
= strip_expr(expr
->left
);
664 struct expression
*right
= strip_expr(expr
->right
);
667 if (left
->type
== EXPR_CALL
) {
668 if (!get_implied_value(right
, &sval
))
670 function_comparison(expr
->op
, left
, sval
, 1);
674 if (right
->type
== EXPR_CALL
) {
675 if (!get_implied_value(left
, &sval
))
677 function_comparison(expr
->op
, right
, sval
, 0);
684 static sval_t
add_one(sval_t sval
)
690 static sval_t
sub_one(sval_t sval
)
696 static void match_comparison(struct expression
*expr
)
698 struct expression
*left
= strip_expr(expr
->left
);
699 struct expression
*right
= strip_expr(expr
->right
);
701 struct range_list
*left_orig
;
702 struct range_list
*left_true
;
703 struct range_list
*left_false
;
704 struct range_list
*right_orig
;
705 struct range_list
*right_true
;
706 struct range_list
*right_false
;
707 struct smatch_state
*left_true_state
;
708 struct smatch_state
*left_false_state
;
709 struct smatch_state
*right_true_state
;
710 struct smatch_state
*right_false_state
;
711 sval_t min
, max
, dummy
;
713 int right_postop
= 0;
715 if (match_func_comparison(expr
))
718 if (left
->op
== SPECIAL_INCREMENT
|| left
->op
== SPECIAL_DECREMENT
) {
719 if (left
->type
== EXPR_POSTOP
) {
720 left
->smatch_flags
|= Handled
;
721 left_postop
= left
->op
;
723 left
= strip_expr(left
->unop
);
725 while (left
->type
== EXPR_ASSIGNMENT
)
726 left
= strip_expr(left
->left
);
728 if (right
->op
== SPECIAL_INCREMENT
|| right
->op
== SPECIAL_DECREMENT
) {
729 if (right
->type
== EXPR_POSTOP
) {
730 right
->smatch_flags
|= Handled
;
731 right_postop
= right
->op
;
733 right
= strip_expr(right
->unop
);
736 type
= get_type(expr
);
740 if (get_implied_range_list(left
, &left_orig
)) {
741 left_orig
= cast_rl(type
, left_orig
);
743 min
= sval_type_min(get_type(left
));
744 max
= sval_type_max(get_type(left
));
745 left_orig
= cast_rl(type
, alloc_range_list(min
, max
));
748 if (get_implied_range_list(right
, &right_orig
)) {
749 right_orig
= cast_rl(type
, right_orig
);
751 min
= sval_type_min(get_type(right
));
752 max
= sval_type_max(get_type(right
));
753 right_orig
= cast_rl(type
, alloc_range_list(min
, max
));
755 min
= sval_type_min(type
);
756 max
= sval_type_max(type
);
758 left_true
= clone_range_list(left_orig
);
759 left_false
= clone_range_list(left_orig
);
760 right_true
= clone_range_list(right_orig
);
761 right_false
= clone_range_list(right_orig
);
765 case SPECIAL_UNSIGNED_LT
:
766 if (!sval_is_max(rl_max(right_orig
))) {
767 left_true
= remove_range(left_orig
, rl_max(right_orig
), max
);
769 if (!sval_is_min(rl_min(right_orig
))) {
770 left_false
= remove_range(left_orig
, min
, sub_one(rl_min(right_orig
)));
773 if (!sval_is_min(rl_min(left_orig
)))
774 right_true
= remove_range(right_orig
, min
, rl_min(left_orig
));
775 if (!sval_is_max(rl_max(left_orig
)))
776 right_false
= remove_range(right_orig
, add_one(rl_max(left_orig
)), max
);
778 case SPECIAL_UNSIGNED_LTE
:
780 if (!sval_is_max(rl_max(right_orig
)))
781 left_true
= remove_range(left_orig
, add_one(rl_max(right_orig
)), max
);
782 if (!sval_is_min(rl_min(right_orig
)))
783 left_false
= remove_range(left_orig
, min
, rl_min(right_orig
));
785 if (!sval_is_min(rl_min(left_orig
)))
786 right_true
= remove_range(right_orig
, min
, sub_one(rl_min(left_orig
)));
787 if (!sval_is_max(rl_max(left_orig
)))
788 right_false
= remove_range(right_orig
, rl_max(left_orig
), max
);
791 if (!sval_is_max(rl_max(right_orig
))) {
792 left_true
= remove_range(left_true
, add_one(rl_max(right_orig
)), max
);
794 if (!sval_is_min(rl_min(right_orig
))) {
795 left_true
= remove_range(left_true
, min
, sub_one(rl_min(right_orig
)));
797 if (sval_cmp(rl_min(right_orig
), rl_max(right_orig
)) == 0)
798 left_false
= remove_range(left_orig
, rl_min(right_orig
), rl_min(right_orig
));
800 if (!sval_is_max(rl_max(left_orig
)))
801 right_true
= remove_range(right_true
, add_one(rl_max(left_orig
)), max
);
802 if (!sval_is_min(rl_min(left_orig
)))
803 right_true
= remove_range(right_true
, min
, sub_one(rl_min(left_orig
)));
804 if (sval_cmp(rl_min(left_orig
), rl_max(left_orig
)) == 0)
805 right_false
= remove_range(right_orig
, rl_min(left_orig
), rl_min(left_orig
));
807 case SPECIAL_UNSIGNED_GTE
:
809 if (!sval_is_min(rl_min(right_orig
)))
810 left_true
= remove_range(left_orig
, min
, sub_one(rl_min(right_orig
)));
811 if (!sval_is_max(rl_max(right_orig
)))
812 left_false
= remove_range(left_orig
, rl_max(right_orig
), max
);
814 if (!sval_is_max(rl_max(left_orig
)))
815 right_true
= remove_range(right_orig
, add_one(rl_max(left_orig
)), max
);
816 if (!sval_is_min(rl_min(left_orig
)))
817 right_false
= remove_range(right_orig
, min
, rl_min(left_orig
));
820 case SPECIAL_UNSIGNED_GT
:
821 if (!sval_is_min(rl_min(right_orig
)))
822 left_true
= remove_range(left_orig
, min
, rl_min(right_orig
));
823 if (!sval_is_max(rl_max(right_orig
)))
824 left_false
= remove_range(left_orig
, add_one(rl_max(right_orig
)), max
);
826 if (!sval_is_max(rl_max(left_orig
)))
827 right_true
= remove_range(right_orig
, rl_max(left_orig
), max
);
828 if (!sval_is_min(rl_min(left_orig
)))
829 right_false
= remove_range(right_orig
, min
, sub_one(rl_min(left_orig
)));
831 case SPECIAL_NOTEQUAL
:
832 if (!sval_is_max(rl_max(right_orig
)))
833 left_false
= remove_range(left_false
, add_one(rl_max(right_orig
)), max
);
834 if (!sval_is_min(rl_min(right_orig
)))
835 left_false
= remove_range(left_false
, min
, sub_one(rl_min(right_orig
)));
836 if (sval_cmp(rl_min(right_orig
), rl_max(right_orig
)) == 0)
837 left_true
= remove_range(left_orig
, rl_min(right_orig
), rl_min(right_orig
));
839 if (!sval_is_max(rl_max(left_orig
)))
840 right_false
= remove_range(right_false
, add_one(rl_max(left_orig
)), max
);
841 if (!sval_is_min(rl_min(left_orig
)))
842 right_false
= remove_range(right_false
, min
, sub_one(rl_min(left_orig
)));
843 if (sval_cmp(rl_min(left_orig
), rl_max(left_orig
)) == 0)
844 right_true
= remove_range(right_orig
, rl_min(left_orig
), rl_min(left_orig
));
850 left_true_state
= alloc_estate_range_list(cast_rl(get_type(left
), left_true
));
851 left_false_state
= alloc_estate_range_list(cast_rl(get_type(left
), left_false
));
852 right_true_state
= alloc_estate_range_list(cast_rl(get_type(right
), right_true
));
853 right_false_state
= alloc_estate_range_list(cast_rl(get_type(right
), right_false
));
857 case SPECIAL_UNSIGNED_LT
:
858 case SPECIAL_UNSIGNED_LTE
:
860 if (get_hard_max(right
, &dummy
))
861 estate_set_hard_max(left_true_state
);
862 if (get_hard_max(left
, &dummy
))
863 estate_set_hard_max(right_false_state
);
866 case SPECIAL_UNSIGNED_GT
:
867 case SPECIAL_UNSIGNED_GTE
:
869 if (get_hard_max(left
, &dummy
))
870 estate_set_hard_max(right_true_state
);
871 if (get_hard_max(right
, &dummy
))
872 estate_set_hard_max(left_false_state
);
876 if (get_hard_max(left
, &dummy
)) {
877 estate_set_hard_max(left_true_state
);
878 estate_set_hard_max(left_false_state
);
880 if (get_hard_max(right
, &dummy
)) {
881 estate_set_hard_max(right_true_state
);
882 estate_set_hard_max(right_false_state
);
885 if (left_postop
== SPECIAL_INCREMENT
) {
886 left_true_state
= increment_state(left_true_state
);
887 left_false_state
= increment_state(left_false_state
);
889 if (left_postop
== SPECIAL_DECREMENT
) {
890 left_true_state
= decrement_state(left_true_state
);
891 left_false_state
= decrement_state(left_false_state
);
893 if (right_postop
== SPECIAL_INCREMENT
) {
894 right_true_state
= increment_state(right_true_state
);
895 right_false_state
= increment_state(right_false_state
);
897 if (right_postop
== SPECIAL_DECREMENT
) {
898 right_true_state
= decrement_state(right_true_state
);
899 right_false_state
= decrement_state(right_false_state
);
902 set_extra_expr_true_false(left
, left_true_state
, left_false_state
);
903 set_extra_expr_true_false(right
, right_true_state
, right_false_state
);
906 /* this is actually hooked from smatch_implied.c... it's hacky, yes */
907 void __extra_match_condition(struct expression
*expr
)
911 struct smatch_state
*pre_state
;
912 struct smatch_state
*true_state
;
913 struct smatch_state
*false_state
;
915 expr
= strip_expr(expr
);
916 switch (expr
->type
) {
918 function_comparison(SPECIAL_NOTEQUAL
, expr
, ll_to_sval(0), 1);
925 zero
= sval_blank(expr
);
928 name
= get_variable_from_expr(expr
, &sym
);
931 pre_state
= get_state(my_id
, name
, sym
);
932 true_state
= add_filter(pre_state
, zero
);
933 if (possibly_true(expr
, SPECIAL_EQUAL
, zero_expr()))
934 false_state
= alloc_estate(zero
);
936 false_state
= alloc_estate_empty();
937 set_extra_true_false(name
, sym
, true_state
, false_state
);
942 match_comparison(expr
);
944 case EXPR_ASSIGNMENT
:
945 __extra_match_condition(expr
->left
);
950 /* returns 1 if it is not possible for expr to be value, otherwise returns 0 */
951 int implied_not_equal(struct expression
*expr
, long long val
)
953 return !possibly_false(expr
, SPECIAL_NOTEQUAL
, value_expr(val
));
956 int get_implied_range_list(struct expression
*expr
, struct range_list
**rl
)
959 struct smatch_state
*state
;
964 expr
= strip_parens(expr
);
968 state
= get_state_expr(my_id
, expr
);
970 *rl
= clone_range_list(estate_ranges(state
));
974 if (expr
->type
== EXPR_CALL
) {
975 if (get_implied_return(expr
, rl
))
977 *rl
= db_return_vals(expr
);
981 if (get_implied_value(expr
, &sval
)) {
982 add_range(rl
, sval
, sval
);
986 if (expr
->type
== EXPR_BINOP
&& expr
->op
== '%') {
987 if (!get_implied_value(expr
->right
, &sval
))
989 add_range(rl
, ll_to_sval(0), ll_to_sval(sval
.value
- 1));
993 if (!get_implied_min(expr
, &min
))
995 if (!get_implied_max(expr
, &max
))
998 *rl
= alloc_range_list(min
, max
);
1001 if (is_whole_range_rl(*rl
))
1006 static struct symbol
*get_arg_type(struct expression
*fn
, int arg
)
1008 struct symbol
*fn_type
;
1010 struct symbol
*arg_type
;
1013 fn_type
= get_type(fn
);
1016 if (fn_type
->type
== SYM_PTR
)
1017 fn_type
= get_real_base_type(fn_type
);
1018 if (fn_type
->type
!= SYM_FN
)
1022 FOR_EACH_PTR(fn_type
->arguments
, tmp
) {
1023 arg_type
= get_real_base_type(tmp
);
1028 } END_FOR_EACH_PTR(tmp
);
1033 int is_whole_range(struct smatch_state
*state
)
1035 return is_whole_range_rl(estate_ranges(state
));
1038 static void struct_member_callback(char *fn
, char *global_static
, int param
, char *printed_name
, struct smatch_state
*state
)
1040 if (is_whole_range(state
))
1042 sm_msg("info: passes param_value '%s' %d '%s' %s %s", fn
, param
, printed_name
, state
->name
, global_static
);
1045 static void match_call_info(struct expression
*expr
)
1047 struct range_list
*rl
= NULL
;
1048 struct expression
*arg
;
1049 struct symbol
*type
;
1053 name
= get_fnptr_name(expr
->fn
);
1057 FOR_EACH_PTR(expr
->args
, arg
) {
1058 type
= get_arg_type(expr
->fn
, i
);
1060 if (get_implied_range_list(arg
, &rl
))
1061 rl
= cast_rl(type
, rl
);
1063 rl
= whole_range_list(type
);
1065 sm_msg("info: passes param_value '%s' %d '$$' %s %s",
1066 name
, i
, show_ranges(rl
),
1067 is_static(expr
->fn
) ? "static" : "global");
1069 } END_FOR_EACH_PTR(arg
);
1074 static void set_param_value(const char *name
, struct symbol
*sym
, char *key
, char *value
)
1076 struct range_list
*rl
= NULL
;
1077 struct smatch_state
*state
;
1080 if (strncmp(key
, "$$", 2))
1083 snprintf(fullname
, 256, "%s%s", name
, key
+ 2);
1084 parse_value_ranges_type(get_real_base_type(sym
), value
, &rl
);
1085 state
= alloc_estate_range_list(rl
);
1086 set_state(SMATCH_EXTRA
, fullname
, sym
, state
);
1089 static void match_call_assign(struct expression
*expr
)
1091 if (expr
->op
!= '=')
1094 /* if we have a db set up this gets set in smatch_function_hooks.c */
1096 set_extra_expr_mod(expr
->left
, extra_undefined(get_type(expr
->left
)));
1099 void register_smatch_extra(int id
)
1103 add_merge_hook(my_id
, &merge_func
);
1104 add_unmatched_state_hook(my_id
, &unmatched_state
);
1105 add_hook(&unop_expr
, OP_HOOK
);
1106 add_hook(&asm_expr
, ASM_HOOK
);
1107 add_hook(&match_function_def
, FUNC_DEF_HOOK
);
1108 add_hook(&match_declarations
, DECLARATION_HOOK
);
1110 add_hook(&match_call_info
, FUNCTION_CALL_HOOK
);
1111 add_member_info_callback(my_id
, struct_member_callback
);
1113 add_definition_db_callback(set_param_value
, PARAM_VALUE
);
1116 void register_smatch_extra_late(int id
)
1118 add_hook(&match_dereferences
, DEREF_HOOK
);
1119 add_hook(&match_pointer_as_array
, OP_HOOK
);
1120 add_db_fn_call_callback(DEREFERENCE
, &set_param_dereferenced
);
1121 add_indirect_modification_hook(SMATCH_EXTRA
, reset_struct_members
);
1122 add_hook(&match_function_call
, FUNCTION_CALL_HOOK
);
1123 add_hook(&match_assign
, ASSIGNMENT_HOOK
);
1124 add_hook(&match_call_assign
, CALL_ASSIGNMENT_HOOK
);