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 (sval_cmp_val(estate_min_sval(sm
->state
), 0) < 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
= sval_type_max(get_type(iter_var
));
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
= sval_type_min(get_type(iter_var
));
266 if (get_sm_state_expr(SMATCH_EXTRA
, condition
->left
) != sm
)
269 switch (condition
->op
) {
270 case SPECIAL_NOTEQUAL
:
272 if (!sval_is_min(end
) && !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 range_list_sval
*rl
= NULL
;
418 struct expression
*left
;
419 struct expression
*right
;
420 struct symbol
*right_sym
;
426 sval_t right_min
, right_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 types_equiv(get_type(expr
->left
), get_type(expr
->right
))) {
445 set_equiv(left
, right
);
449 right_min
= sval_type_min(get_type(expr
->right
));
450 right_max
= sval_type_max(get_type(expr
->right
));
452 known
= get_implied_value_sval(right
, &value
);
455 if (get_implied_range_list_sval(right
, &rl
)) {
456 rl
= cast_rl(rl
, get_type(expr
->left
));
457 set_extra_mod(name
, sym
, alloc_estate_range_list_sval(rl
));
463 case SPECIAL_ADD_ASSIGN
:
464 if (get_implied_min_sval(left
, &tmp
)) {
466 right_min
= sval_binop(tmp
, '+', value
);
470 if (!inside_loop() && known
&& get_implied_max_sval(left
, &tmp
))
471 right_max
= sval_binop(tmp
, '+', value
);
473 case SPECIAL_SUB_ASSIGN
:
474 if (get_implied_max_sval(left
, &tmp
)) {
476 right_max
= sval_binop(tmp
, '-', value
);
480 if (!inside_loop() && known
&& get_implied_min_sval(left
, &tmp
))
481 right_min
= sval_binop(tmp
, '-', value
);
484 rl
= cast_rl(alloc_range_list_sval(right_min
, right_max
), get_type(expr
->left
));
485 set_extra_mod(name
, sym
, alloc_estate_range_list_sval(rl
));
487 free_string(right_name
);
491 static void reset_struct_members(struct sm_state
*sm
)
493 set_extra_mod(sm
->name
, sm
->sym
, extra_undefined());
496 static struct smatch_state
*increment_state(struct smatch_state
*state
)
498 sval_t min
= estate_min_sval(state
);
499 sval_t max
= estate_max_sval(state
);
502 max
= sval_type_max(max
.type
);
504 if (!sval_is_min(min
))
506 if (!sval_is_max(max
))
508 return alloc_estate_range_sval(min
, max
);
511 static struct smatch_state
*decrement_state(struct smatch_state
*state
)
513 sval_t min
= estate_min_sval(state
);
514 sval_t max
= estate_max_sval(state
);
517 min
= sval_type_min(min
.type
);
519 if (!sval_is_min(min
))
521 if (!sval_is_max(max
))
523 return alloc_estate_range_sval(min
, max
);
526 static void unop_expr(struct expression
*expr
)
528 struct smatch_state
*state
;
530 if (expr
->smatch_flags
& Handled
)
534 case SPECIAL_INCREMENT
:
535 state
= get_state_expr(SMATCH_EXTRA
, expr
->unop
);
536 state
= increment_state(state
);
537 set_extra_expr_mod(expr
->unop
, state
);
539 case SPECIAL_DECREMENT
:
540 state
= get_state_expr(SMATCH_EXTRA
, expr
->unop
);
541 state
= decrement_state(state
);
542 set_extra_expr_mod(expr
->unop
, state
);
549 static void asm_expr(struct statement
*stmt
)
552 struct expression
*expr
;
555 FOR_EACH_PTR(stmt
->asm_outputs
, expr
) {
557 case 0: /* identifier */
558 case 1: /* constraint */
561 case 2: /* expression */
563 set_extra_expr_mod(expr
, extra_undefined());
566 } END_FOR_EACH_PTR(expr
);
569 static void delete_state_tracker(struct tracker
*t
)
571 remove_from_equiv(t
->name
, t
->sym
);
572 delete_state(t
->owner
, t
->name
, t
->sym
);
575 static void scoped_state_extra(const char *name
, struct symbol
*sym
)
579 t
= alloc_tracker(SMATCH_EXTRA
, name
, sym
);
580 add_scope_hook((scope_hook
*)&delete_state_tracker
, t
);
583 static void match_declarations(struct symbol
*sym
)
588 name
= sym
->ident
->name
;
589 if (!sym
->initializer
) {
590 set_state(SMATCH_EXTRA
, name
, sym
, extra_undefined());
591 scoped_state_extra(name
, sym
);
596 static void check_dereference(struct expression
*expr
)
598 set_extra_expr_nomod(expr
, alloc_estate_range_sval(valid_ptr_min_sval
, valid_ptr_max_sval
));
601 static void match_dereferences(struct expression
*expr
)
603 if (expr
->type
!= EXPR_PREOP
)
605 check_dereference(expr
->unop
);
608 static void match_pointer_as_array(struct expression
*expr
)
612 check_dereference(expr
->unop
->left
);
615 static void set_param_dereferenced(struct expression
*arg
, char *unused
)
617 check_dereference(arg
);
620 static void match_function_def(struct symbol
*sym
)
624 FOR_EACH_PTR(sym
->ctype
.base_type
->arguments
, arg
) {
627 set_state(my_id
, arg
->ident
->name
, arg
, extra_undefined());
628 } END_FOR_EACH_PTR(arg
);
631 static int match_func_comparison(struct expression
*expr
)
633 struct expression
*left
= strip_expr(expr
->left
);
634 struct expression
*right
= strip_expr(expr
->right
);
637 if (left
->type
== EXPR_CALL
) {
638 if (!get_implied_value_sval(right
, &sval
))
640 function_comparison(expr
->op
, left
, sval
, 1);
644 if (right
->type
== EXPR_CALL
) {
645 if (!get_implied_value_sval(left
, &sval
))
647 function_comparison(expr
->op
, right
, sval
, 0);
654 static sval_t
add_one(sval_t sval
)
660 static sval_t
sub_one(sval_t sval
)
666 static void match_comparison(struct expression
*expr
)
668 struct expression
*left
= strip_expr(expr
->left
);
669 struct expression
*right
= strip_expr(expr
->right
);
671 struct range_list_sval
*left_orig
;
672 struct range_list_sval
*left_true
;
673 struct range_list_sval
*left_false
;
674 struct range_list_sval
*right_orig
;
675 struct range_list_sval
*right_true
;
676 struct range_list_sval
*right_false
;
677 struct smatch_state
*left_true_state
;
678 struct smatch_state
*left_false_state
;
679 struct smatch_state
*right_true_state
;
680 struct smatch_state
*right_false_state
;
683 int right_postop
= 0;
685 if (match_func_comparison(expr
))
688 if (left
->op
== SPECIAL_INCREMENT
|| left
->op
== SPECIAL_DECREMENT
) {
689 if (left
->type
== EXPR_POSTOP
) {
690 left
->smatch_flags
|= Handled
;
691 left_postop
= left
->op
;
693 left
= strip_expr(left
->unop
);
696 if (right
->op
== SPECIAL_INCREMENT
|| right
->op
== SPECIAL_DECREMENT
) {
697 if (right
->type
== EXPR_POSTOP
) {
698 right
->smatch_flags
|= Handled
;
699 right_postop
= right
->op
;
701 right
= strip_expr(right
->unop
);
704 type
= get_type(expr
);
706 sm_msg("debug: failed to get type for '%s'", get_variable_from_expr_complex(expr
, NULL
));
709 min
= sval_type_min(type
);
710 max
= sval_type_max(type
);
711 if (get_implied_range_list_sval(left
, &left_orig
))
712 left_orig
= cast_rl(left_orig
, type
);
714 left_orig
= alloc_range_list_sval(min
, max
);
716 if (get_implied_range_list_sval(right
, &right_orig
))
717 right_orig
= cast_rl(right_orig
, type
);
719 right_orig
= alloc_range_list_sval(min
, max
);
721 left_true
= clone_range_list_sval(left_orig
);
722 left_false
= clone_range_list_sval(left_orig
);
723 right_true
= clone_range_list_sval(right_orig
);
724 right_false
= clone_range_list_sval(right_orig
);
728 case SPECIAL_UNSIGNED_LT
:
729 if (!sval_is_max(rl_max_sval(right_orig
))) {
730 left_true
= remove_range_sval(left_orig
, rl_max_sval(right_orig
), max
);
732 if (!sval_is_min(rl_min_sval(right_orig
))) {
733 left_false
= remove_range_sval(left_orig
, min
, sub_one(rl_min_sval(right_orig
)));
736 if (!sval_is_min(rl_min_sval(left_orig
)))
737 right_true
= remove_range_sval(right_orig
, min
, rl_min_sval(left_orig
));
738 if (!sval_is_max(rl_max_sval(left_orig
)))
739 right_false
= remove_range_sval(right_orig
, add_one(rl_max_sval(left_orig
)), max
);
741 case SPECIAL_UNSIGNED_LTE
:
743 if (!sval_is_max(rl_max_sval(right_orig
)))
744 left_true
= remove_range_sval(left_orig
, add_one(rl_max_sval(right_orig
)), max
);
745 if (!sval_is_min(rl_min_sval(right_orig
)))
746 left_false
= remove_range_sval(left_orig
, min
, rl_min_sval(right_orig
));
748 if (!sval_is_min(rl_min_sval(left_orig
)))
749 right_true
= remove_range_sval(right_orig
, min
, sub_one(rl_min_sval(left_orig
)));
750 if (!sval_is_max(rl_max_sval(left_orig
)))
751 right_false
= remove_range_sval(right_orig
, rl_max_sval(left_orig
), max
);
754 if (!sval_is_max(rl_max_sval(right_orig
))) {
755 left_true
= remove_range_sval(left_true
, add_one(rl_max_sval(right_orig
)), max
);
757 if (!sval_is_min(rl_min_sval(right_orig
))) {
758 left_true
= remove_range_sval(left_true
, min
, sub_one(rl_min_sval(right_orig
)));
760 if (sval_cmp(rl_min_sval(right_orig
), rl_max_sval(right_orig
)) == 0)
761 left_false
= remove_range_sval(left_orig
, rl_min_sval(right_orig
), rl_min_sval(right_orig
));
763 if (!sval_is_max(rl_max_sval(left_orig
)))
764 right_true
= remove_range_sval(right_true
, add_one(rl_max_sval(left_orig
)), max
);
765 if (!sval_is_min(rl_min_sval(left_orig
)))
766 right_true
= remove_range_sval(right_true
, min
, sub_one(rl_min_sval(left_orig
)));
767 if (sval_cmp(rl_min_sval(left_orig
), rl_max_sval(left_orig
)) == 0)
768 right_false
= remove_range_sval(right_orig
, rl_min_sval(left_orig
), rl_min_sval(left_orig
));
770 case SPECIAL_UNSIGNED_GTE
:
772 if (!sval_is_min(rl_min_sval(right_orig
)))
773 left_true
= remove_range_sval(left_orig
, min
, sub_one(rl_min_sval(right_orig
)));
774 if (!sval_is_max(rl_max_sval(right_orig
)))
775 left_false
= remove_range_sval(left_orig
, rl_max_sval(right_orig
), max
);
777 if (!sval_is_max(rl_max_sval(left_orig
)))
778 right_true
= remove_range_sval(right_orig
, add_one(rl_max_sval(left_orig
)), max
);
779 if (!sval_is_min(rl_min_sval(left_orig
)))
780 right_false
= remove_range_sval(right_orig
, min
, rl_min_sval(left_orig
));
783 case SPECIAL_UNSIGNED_GT
:
784 if (!sval_is_min(rl_min_sval(right_orig
)))
785 left_true
= remove_range_sval(left_orig
, min
, rl_min_sval(right_orig
));
786 if (!sval_is_max(rl_max_sval(right_orig
)))
787 left_false
= remove_range_sval(left_orig
, add_one(rl_max_sval(right_orig
)), max
);
789 if (!sval_is_max(rl_max_sval(left_orig
)))
790 right_true
= remove_range_sval(right_orig
, rl_max_sval(left_orig
), max
);
791 if (!sval_is_min(rl_min_sval(left_orig
)))
792 right_false
= remove_range_sval(right_orig
, min
, sub_one(rl_min_sval(left_orig
)));
794 case SPECIAL_NOTEQUAL
:
795 if (!sval_is_max(rl_max_sval(right_orig
)))
796 left_false
= remove_range_sval(left_false
, add_one(rl_max_sval(right_orig
)), max
);
797 if (!sval_is_min(rl_min_sval(right_orig
)))
798 left_false
= remove_range_sval(left_false
, min
, sub_one(rl_min_sval(right_orig
)));
799 if (sval_cmp(rl_min_sval(right_orig
), rl_max_sval(right_orig
)) == 0)
800 left_true
= remove_range_sval(left_orig
, rl_min_sval(right_orig
), rl_min_sval(right_orig
));
802 if (!sval_is_max(rl_max_sval(left_orig
)))
803 right_false
= remove_range_sval(right_false
, add_one(rl_max_sval(left_orig
)), max
);
804 if (!sval_is_min(rl_min_sval(left_orig
)))
805 right_false
= remove_range_sval(right_false
, min
, sub_one(rl_min_sval(left_orig
)));
806 if (sval_cmp(rl_min_sval(left_orig
), rl_max_sval(left_orig
)) == 0)
807 right_true
= remove_range_sval(right_orig
, rl_min_sval(left_orig
), rl_min_sval(left_orig
));
813 left_true_state
= alloc_estate_range_list_sval(cast_rl(left_true
, get_type(left
)));
814 left_false_state
= alloc_estate_range_list_sval(cast_rl(left_false
, get_type(left
)));
815 right_true_state
= alloc_estate_range_list_sval(cast_rl(right_true
, get_type(right
)));
816 right_false_state
= alloc_estate_range_list_sval(cast_rl(right_false
, get_type(right
)));
818 if (left_postop
== SPECIAL_INCREMENT
) {
819 left_true_state
= increment_state(left_true_state
);
820 left_false_state
= increment_state(left_false_state
);
822 if (left_postop
== SPECIAL_DECREMENT
) {
823 left_true_state
= decrement_state(left_true_state
);
824 left_false_state
= decrement_state(left_false_state
);
826 if (right_postop
== SPECIAL_INCREMENT
) {
827 right_true_state
= increment_state(right_true_state
);
828 right_false_state
= increment_state(right_false_state
);
830 if (right_postop
== SPECIAL_DECREMENT
) {
831 right_true_state
= decrement_state(right_true_state
);
832 right_false_state
= decrement_state(right_false_state
);
835 set_extra_expr_true_false(left
, left_true_state
, left_false_state
);
836 set_extra_expr_true_false(right
, right_true_state
, right_false_state
);
839 /* this is actually hooked from smatch_implied.c... it's hacky, yes */
840 void __extra_match_condition(struct expression
*expr
)
844 struct smatch_state
*pre_state
;
845 struct smatch_state
*true_state
;
846 struct smatch_state
*false_state
;
848 expr
= strip_expr(expr
);
849 switch (expr
->type
) {
851 function_comparison(SPECIAL_NOTEQUAL
, expr
, ll_to_sval(0), 1);
856 name
= get_variable_from_expr(expr
, &sym
);
859 pre_state
= get_state(my_id
, name
, sym
);
860 true_state
= add_filter(pre_state
, ll_to_sval(0));
861 if (possibly_true(expr
, SPECIAL_EQUAL
, zero_expr()))
862 false_state
= alloc_estate_sval(ll_to_sval(0));
864 false_state
= alloc_estate_empty();
865 set_extra_true_false(name
, sym
, true_state
, false_state
);
869 match_comparison(expr
);
871 case EXPR_ASSIGNMENT
:
872 __extra_match_condition(expr
->left
);
877 /* returns 1 if it is not possible for expr to be value, otherwise returns 0 */
878 int implied_not_equal(struct expression
*expr
, long long val
)
880 return !possibly_false(expr
, SPECIAL_NOTEQUAL
, value_expr(val
));
883 int get_implied_range_list_sval(struct expression
*expr
, struct range_list_sval
**rl
)
886 struct smatch_state
*state
;
891 expr
= strip_parens(expr
);
895 state
= get_state_expr(my_id
, expr
);
897 *rl
= clone_range_list_sval(estate_ranges_sval(state
));
901 if (expr
->type
== EXPR_CALL
) {
902 if (get_implied_return_sval(expr
, rl
))
904 *rl
= db_return_vals(expr
);
908 if (get_implied_value_sval(expr
, &sval
)) {
909 add_range_sval(rl
, sval
, sval
);
913 if (expr
->type
== EXPR_BINOP
&& expr
->op
== '%') {
914 if (!get_implied_value_sval(expr
->right
, &sval
))
916 add_range_sval(rl
, ll_to_sval(0), ll_to_sval(sval
.value
- 1));
920 if (!get_implied_min_sval(expr
, &min
))
922 if (!get_implied_max_sval(expr
, &max
))
925 *rl
= alloc_range_list_sval(min
, max
);
928 if (is_whole_range_rl_sval(*rl
))
933 int is_whole_range(struct smatch_state
*state
)
935 return is_whole_range_rl_sval(estate_ranges_sval(state
));
938 static void struct_member_callback(char *fn
, char *global_static
, int param
, char *printed_name
, struct smatch_state
*state
)
940 if (is_whole_range(state
))
942 sm_msg("info: passes param_value '%s' %d '%s' %s %s", fn
, param
, printed_name
, state
->name
, global_static
);
945 static void match_call_info(struct expression
*expr
)
947 struct range_list_sval
*rl
= NULL
;
948 struct expression
*arg
;
952 name
= get_fnptr_name(expr
->fn
);
956 FOR_EACH_PTR(expr
->args
, arg
) {
957 if (get_implied_range_list_sval(arg
, &rl
) && !is_whole_range_rl_sval(rl
)) {
958 sm_msg("info: passes param_value '%s' %d '$$' %s %s",
959 name
, i
, show_ranges_sval(rl
),
960 is_static(expr
->fn
) ? "static" : "global");
963 } END_FOR_EACH_PTR(arg
);
968 static void set_param_value(const char *name
, struct symbol
*sym
, char *key
, char *value
)
970 struct range_list_sval
*rl
= NULL
;
971 struct smatch_state
*state
;
974 if (strncmp(key
, "$$", 2))
977 snprintf(fullname
, 256, "%s%s", name
, key
+ 2);
978 get_value_ranges_sval(value
, &rl
);
979 state
= alloc_estate_range_list_sval(rl
);
980 set_state(SMATCH_EXTRA
, fullname
, sym
, state
);
983 static void match_call_assign(struct expression
*expr
)
988 /* if we have a db set up this gets set in smatch_function_hooks.c */
990 set_extra_expr_mod(expr
->left
, extra_undefined());
993 void register_smatch_extra(int id
)
997 alloc_estate_undefined();
998 add_merge_hook(my_id
, &merge_func
);
999 add_unmatched_state_hook(my_id
, &unmatched_state
);
1000 add_hook(&unop_expr
, OP_HOOK
);
1001 add_hook(&asm_expr
, ASM_HOOK
);
1002 add_hook(&match_function_def
, FUNC_DEF_HOOK
);
1003 add_hook(&match_declarations
, DECLARATION_HOOK
);
1005 add_hook(&match_call_info
, FUNCTION_CALL_HOOK
);
1006 add_member_info_callback(my_id
, struct_member_callback
);
1008 add_definition_db_callback(set_param_value
, PARAM_VALUE
);
1011 void register_smatch_extra_late(int id
)
1013 add_hook(&match_dereferences
, DEREF_HOOK
);
1014 add_hook(&match_pointer_as_array
, OP_HOOK
);
1015 add_db_fn_call_callback(DEREFERENCE
, &set_param_dereferenced
);
1016 add_indirect_modification_hook(SMATCH_EXTRA
, reset_struct_members
);
1017 add_hook(&match_function_call
, FUNCTION_CALL_HOOK
);
1018 add_hook(&match_assign
, ASSIGNMENT_HOOK
);
1019 add_hook(&match_call_assign
, CALL_ASSIGNMENT_HOOK
);