2 * sparse/smatch_extra.c
4 * Copyright (C) 2008 Dan Carpenter.
6 * Licensed under the Open Software License version 1.1
11 * smatch_extra.c is supposed to track the value of every variable.
23 #include "smatch_slist.h"
24 #include "smatch_extra.h"
28 struct string_list
*__ignored_macros
= NULL
;
29 static int in_warn_on_macro()
31 struct statement
*stmt
;
35 stmt
= last_ptr_list((struct ptr_list
*)big_statement_stack
);
36 macro
= get_macro_name(stmt
->pos
);
40 FOR_EACH_PTR(__ignored_macros
, tmp
) {
41 if (!strcmp(tmp
, macro
))
43 } END_FOR_EACH_PTR(tmp
);
47 struct sm_state
*set_extra_mod(const char *name
, struct symbol
*sym
, struct smatch_state
*state
)
49 if (in_warn_on_macro())
51 remove_from_equiv(name
, sym
);
52 return set_state(SMATCH_EXTRA
, name
, sym
, state
);
55 struct sm_state
*set_extra_expr_mod(struct expression
*expr
, struct smatch_state
*state
)
57 if (in_warn_on_macro())
59 remove_from_equiv_expr(expr
);
60 return set_state_expr(SMATCH_EXTRA
, expr
, state
);
64 * This is for return_implies_state() hooks which modify a SMATCH_EXTRA state
66 void set_extra_expr_nomod(struct expression
*expr
, struct smatch_state
*state
)
69 struct smatch_state
*orig_state
;
71 orig_state
= get_state_expr(SMATCH_EXTRA
, expr
);
73 if (!estate_related(orig_state
)) {
74 set_state_expr(SMATCH_EXTRA
, expr
, state
);
78 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 long long filter_min
, long long filter_max
)
133 struct range_list
*rl
;
136 orig
= extra_undefined();
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
, long long num
)
144 return filter_range(orig
, num
, num
);
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
);
164 static struct sm_state
*handle_canonical_while_count_down(struct statement
*loop
)
166 struct expression
*iter_var
;
167 struct expression
*condition
;
171 condition
= strip_expr(loop
->iterator_pre_condition
);
174 if (condition
->type
!= EXPR_PREOP
&& condition
->type
!= EXPR_POSTOP
)
176 if (condition
->op
!= SPECIAL_DECREMENT
)
179 iter_var
= condition
->unop
;
180 sm
= get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
183 if (estate_min(sm
->state
) < 0)
185 start
= estate_max(sm
->state
);
188 if (start
!= whole_range
.max
)
191 if (condition
->type
== EXPR_PREOP
)
192 set_extra_expr_mod(iter_var
, alloc_estate_range(1, start
));
193 if (condition
->type
== EXPR_POSTOP
)
194 set_extra_expr_mod(iter_var
, alloc_estate_range(0, start
));
195 return get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
198 static struct sm_state
*handle_canonical_for_inc(struct expression
*iter_expr
,
199 struct expression
*condition
)
201 struct expression
*iter_var
;
206 iter_var
= iter_expr
->unop
;
207 sm
= get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
210 if (!estate_get_single_value(sm
->state
, &start
))
212 if (!get_implied_value(condition
->right
, &end
))
213 end
= whole_range
.max
;
214 if (get_sm_state_expr(SMATCH_EXTRA
, condition
->left
) != sm
)
217 switch (condition
->op
) {
218 case SPECIAL_NOTEQUAL
:
220 if (end
!= whole_range
.max
)
230 set_extra_expr_mod(iter_var
, alloc_estate_range(start
, end
));
231 return get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
234 static struct sm_state
*handle_canonical_for_dec(struct expression
*iter_expr
,
235 struct expression
*condition
)
237 struct expression
*iter_var
;
242 iter_var
= iter_expr
->unop
;
243 sm
= get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
246 if (!estate_get_single_value(sm
->state
, &start
))
248 if (!get_implied_value(condition
->right
, &end
))
249 end
= whole_range
.max
;
250 if (get_sm_state_expr(SMATCH_EXTRA
, condition
->left
) != sm
)
253 switch (condition
->op
) {
254 case SPECIAL_NOTEQUAL
:
256 if (end
!= whole_range
.min
)
266 set_extra_expr_mod(iter_var
, alloc_estate_range(end
, start
));
267 return get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
270 static struct sm_state
*handle_canonical_for_loops(struct statement
*loop
)
272 struct expression
*iter_expr
;
273 struct expression
*condition
;
275 if (!loop
->iterator_post_statement
)
277 if (loop
->iterator_post_statement
->type
!= STMT_EXPRESSION
)
279 iter_expr
= loop
->iterator_post_statement
->expression
;
280 if (!loop
->iterator_pre_condition
)
282 if (loop
->iterator_pre_condition
->type
!= EXPR_COMPARE
)
284 condition
= loop
->iterator_pre_condition
;
286 if (iter_expr
->op
== SPECIAL_INCREMENT
)
287 return handle_canonical_for_inc(iter_expr
, condition
);
288 if (iter_expr
->op
== SPECIAL_DECREMENT
)
289 return handle_canonical_for_dec(iter_expr
, condition
);
293 struct sm_state
*__extra_handle_canonical_loops(struct statement
*loop
, struct state_list
**slist
)
295 struct sm_state
*ret
;
297 __push_fake_cur_slist();
298 if (!loop
->iterator_post_statement
)
299 ret
= handle_canonical_while_count_down(loop
);
301 ret
= handle_canonical_for_loops(loop
);
302 *slist
= __pop_fake_cur_slist();
306 int __iterator_unchanged(struct sm_state
*sm
)
310 if (get_sm_state(my_id
, sm
->name
, sm
->sym
) == sm
)
315 static void while_count_down_after(struct sm_state
*sm
, struct expression
*condition
)
317 long long after_value
;
319 /* paranoid checking. prolly not needed */
320 condition
= strip_expr(condition
);
323 if (condition
->type
!= EXPR_PREOP
&& condition
->type
!= EXPR_POSTOP
)
325 if (condition
->op
!= SPECIAL_DECREMENT
)
327 after_value
= estate_min(sm
->state
);
329 set_extra_mod(sm
->name
, sm
->sym
, alloc_estate(after_value
));
332 void __extra_pre_loop_hook_after(struct sm_state
*sm
,
333 struct statement
*iterator
,
334 struct expression
*condition
)
336 struct expression
*iter_expr
;
341 struct smatch_state
*state
;
345 while_count_down_after(sm
, condition
);
349 iter_expr
= iterator
->expression
;
351 if (condition
->type
!= EXPR_COMPARE
)
353 if (!get_value(condition
->left
, &value
)) {
354 if (!get_value(condition
->right
, &value
))
359 name
= get_variable_from_expr(condition
->left
, &sym
);
361 name
= get_variable_from_expr(condition
->right
, &sym
);
364 if (sym
!= sm
->sym
|| strcmp(name
, sm
->name
))
366 state
= get_state(my_id
, name
, sym
);
367 min
= estate_min(state
);
368 max
= estate_max(state
);
369 if (iter_expr
->op
== SPECIAL_INCREMENT
&&
370 min
!= whole_range
.min
&&
371 max
== whole_range
.max
) {
372 set_extra_mod(name
, sym
, alloc_estate(min
));
373 } else if (min
== whole_range
.min
&& max
!= whole_range
.max
) {
374 set_extra_mod(name
, sym
, alloc_estate(max
));
381 static struct smatch_state
*unmatched_state(struct sm_state
*sm
)
383 return extra_undefined();
386 static void match_function_call(struct expression
*expr
)
388 struct expression
*arg
;
389 struct expression
*tmp
;
391 FOR_EACH_PTR(expr
->args
, arg
) {
392 tmp
= strip_expr(arg
);
393 if (tmp
->type
== EXPR_PREOP
&& tmp
->op
== '&') {
394 remove_from_equiv_expr(tmp
->unop
);
395 set_state_expr(SMATCH_EXTRA
, tmp
->unop
, extra_undefined());
397 } END_FOR_EACH_PTR(arg
);
400 static void match_assign(struct expression
*expr
)
402 struct expression
*left
;
403 struct expression
*right
;
404 struct symbol
*right_sym
;
410 long long min
= whole_range
.min
;
411 long long max
= whole_range
.max
;
414 if (__is_condition_assign(expr
))
416 left
= strip_expr(expr
->left
);
417 name
= get_variable_from_expr(left
, &sym
);
420 right
= strip_parens(expr
->right
);
421 while (right
->type
== EXPR_ASSIGNMENT
&& right
->op
== '=')
422 right
= strip_parens(right
->left
);
424 if (expr
->op
== '=' && right
->type
== EXPR_CALL
)
425 return; /* these are handled in match_call_assign() */
427 right_name
= get_variable_from_expr(right
, &right_sym
);
428 if (expr
->op
== '=' && right_name
&& right_sym
) {
429 set_equiv(left
, right
);
433 known
= get_implied_value(right
, &value
);
436 struct range_list
*rl
= NULL
;
438 if (get_implied_range_list(right
, &rl
)) {
439 set_extra_mod(name
, sym
, alloc_estate_range_list(rl
));
443 if (expr_unsigned(right
))
447 case SPECIAL_ADD_ASSIGN
:
448 if (get_implied_min(left
, &tmp
)) {
454 if (!inside_loop() && known
&& get_implied_max(left
, &tmp
))
457 case SPECIAL_SUB_ASSIGN
:
458 if (get_implied_max(left
, &tmp
)) {
464 if (!inside_loop() && known
&& get_implied_min(left
, &tmp
))
468 set_extra_mod(name
, sym
, alloc_estate_range(min
, max
));
470 free_string(right_name
);
474 static void reset_struct_members(struct sm_state
*sm
)
476 set_extra_mod(sm
->name
, sm
->sym
, extra_undefined());
479 static struct smatch_state
*increment_state(struct smatch_state
*state
)
481 long long min
= estate_min(state
);
482 long long max
= estate_max(state
);
485 max
= whole_range
.max
;
487 if (min
!= whole_range
.min
)
489 if (max
!= whole_range
.max
)
491 return alloc_estate_range(min
, max
);
494 static struct smatch_state
*decrement_state(struct smatch_state
*state
)
496 long long min
= estate_min(state
);
497 long long max
= estate_max(state
);
500 min
= whole_range
.min
;
502 if (min
!= whole_range
.min
)
504 if (max
!= whole_range
.max
)
506 return alloc_estate_range(min
, max
);
509 static void unop_expr(struct expression
*expr
)
511 struct smatch_state
*state
;
513 if (expr
->smatch_flags
& Handled
)
517 case SPECIAL_INCREMENT
:
518 state
= get_state_expr(SMATCH_EXTRA
, expr
->unop
);
519 state
= increment_state(state
);
520 set_extra_expr_mod(expr
->unop
, state
);
522 case SPECIAL_DECREMENT
:
523 state
= get_state_expr(SMATCH_EXTRA
, expr
->unop
);
524 state
= decrement_state(state
);
525 set_extra_expr_mod(expr
->unop
, state
);
532 static void delete_state_tracker(struct tracker
*t
)
534 remove_from_equiv(t
->name
, t
->sym
);
535 delete_state(t
->owner
, t
->name
, t
->sym
);
538 static void scoped_state_extra(const char *name
, struct symbol
*sym
)
542 t
= alloc_tracker(SMATCH_EXTRA
, name
, sym
);
543 add_scope_hook((scope_hook
*)&delete_state_tracker
, t
);
546 static void match_declarations(struct symbol
*sym
)
551 name
= sym
->ident
->name
;
552 if (!sym
->initializer
) {
553 set_state(SMATCH_EXTRA
, name
, sym
, extra_undefined());
554 scoped_state_extra(name
, sym
);
559 static void check_dereference(struct expression
*expr
)
561 set_extra_expr_nomod(expr
, alloc_estate_range(valid_ptr_min
, valid_ptr_max
));
564 static void match_dereferences(struct expression
*expr
)
566 if (expr
->type
!= EXPR_PREOP
)
568 check_dereference(expr
->unop
);
571 static void match_pointer_as_array(struct expression
*expr
)
575 check_dereference(expr
->unop
->left
);
578 static void set_param_dereferenced(struct expression
*arg
, char *unused
)
580 check_dereference(arg
);
583 static void match_function_def(struct symbol
*sym
)
587 FOR_EACH_PTR(sym
->ctype
.base_type
->arguments
, arg
) {
590 set_state(my_id
, arg
->ident
->name
, arg
, extra_undefined());
591 } END_FOR_EACH_PTR(arg
);
594 static int match_func_comparison(struct expression
*expr
)
596 struct expression
*left
= strip_expr(expr
->left
);
597 struct expression
*right
= strip_expr(expr
->right
);
600 if (left
->type
== EXPR_CALL
) {
601 if (!get_implied_value(right
, &val
))
603 function_comparison(expr
->op
, left
, val
, 1);
607 if (right
->type
== EXPR_CALL
) {
608 if (!get_implied_value(left
, &val
))
610 function_comparison(expr
->op
, right
, val
, 0);
617 static void match_comparison(struct expression
*expr
)
619 struct expression
*left
= strip_expr(expr
->left
);
620 struct expression
*right
= strip_expr(expr
->right
);
621 struct range_list
*left_orig
;
622 struct range_list
*left_true
;
623 struct range_list
*left_false
;
624 struct range_list
*right_orig
;
625 struct range_list
*right_true
;
626 struct range_list
*right_false
;
627 struct smatch_state
*left_true_state
;
628 struct smatch_state
*left_false_state
;
629 struct smatch_state
*right_true_state
;
630 struct smatch_state
*right_false_state
;
632 int right_postop
= 0;
634 if (match_func_comparison(expr
))
637 if (left
->op
== SPECIAL_INCREMENT
|| left
->op
== SPECIAL_DECREMENT
) {
638 if (left
->type
== EXPR_POSTOP
) {
639 left
->smatch_flags
|= Handled
;
640 left_postop
= left
->op
;
642 left
= strip_expr(left
->unop
);
645 if (right
->op
== SPECIAL_INCREMENT
|| right
->op
== SPECIAL_DECREMENT
) {
646 if (right
->type
== EXPR_POSTOP
) {
647 right
->smatch_flags
|= Handled
;
648 right_postop
= right
->op
;
650 right
= strip_expr(right
->unop
);
653 if (!get_implied_range_list(left
, &left_orig
))
654 left_orig
= alloc_range_list(whole_range
.min
, whole_range
.max
);
655 if (!get_implied_range_list(right
, &right_orig
))
656 right_orig
= alloc_range_list(whole_range
.min
, whole_range
.max
);
658 left_true
= clone_range_list(left_orig
);
659 left_false
= clone_range_list(left_orig
);
660 right_true
= clone_range_list(right_orig
);
661 right_false
= clone_range_list(right_orig
);
665 case SPECIAL_UNSIGNED_LT
:
666 if (rl_max(right_orig
) != whole_range
.max
)
667 left_true
= remove_range(left_orig
, rl_max(right_orig
), whole_range
.max
);
668 if (rl_min(right_orig
) != whole_range
.min
)
669 left_false
= remove_range(left_orig
, whole_range
.min
, rl_min(right_orig
) - 1);
671 if (rl_min(left_orig
) != whole_range
.min
)
672 right_true
= remove_range(right_orig
, whole_range
.min
, rl_min(left_orig
));
673 if (rl_max(left_orig
) != whole_range
.max
)
674 right_false
= remove_range(right_orig
, rl_max(left_orig
) + 1, whole_range
.max
);
676 case SPECIAL_UNSIGNED_LTE
:
678 if (rl_max(right_orig
) != whole_range
.max
)
679 left_true
= remove_range(left_orig
, rl_max(right_orig
) + 1, whole_range
.max
);
680 if (rl_min(right_orig
) != whole_range
.min
)
681 left_false
= remove_range(left_orig
, whole_range
.min
, rl_min(right_orig
));
683 if (rl_min(left_orig
) != whole_range
.min
)
684 right_true
= remove_range(right_orig
, whole_range
.min
, rl_min(left_orig
) - 1);
685 if (rl_max(left_orig
) != whole_range
.max
)
686 right_false
= remove_range(right_orig
, rl_max(left_orig
), whole_range
.max
);
689 if (rl_max(right_orig
) != whole_range
.max
)
690 left_true
= remove_range(left_true
, rl_max(right_orig
) + 1, whole_range
.max
);
691 if (rl_min(right_orig
) != whole_range
.min
)
692 left_true
= remove_range(left_true
, whole_range
.min
, rl_min(right_orig
) - 1);
693 if (rl_min(right_orig
) == rl_max(right_orig
))
694 left_false
= remove_range(left_orig
, rl_min(right_orig
), rl_min(right_orig
));
696 if (rl_max(left_orig
) != whole_range
.max
)
697 right_true
= remove_range(right_true
, rl_max(left_orig
) + 1, whole_range
.max
);
698 if (rl_min(left_orig
) != whole_range
.min
)
699 right_true
= remove_range(right_true
, whole_range
.min
, rl_min(left_orig
) - 1);
700 if (rl_min(left_orig
) == rl_max(left_orig
))
701 right_false
= remove_range(right_orig
, rl_min(left_orig
), rl_min(left_orig
));
703 case SPECIAL_UNSIGNED_GTE
:
705 if (rl_min(right_orig
) != whole_range
.min
)
706 left_true
= remove_range(left_orig
, whole_range
.min
, rl_min(right_orig
) - 1);
707 if (rl_max(right_orig
) != whole_range
.max
)
708 left_false
= remove_range(left_orig
, rl_max(right_orig
), whole_range
.max
);
710 if (rl_max(left_orig
) != whole_range
.max
)
711 right_true
= remove_range(right_orig
, rl_max(left_orig
) + 1, whole_range
.max
);
712 if (rl_min(left_orig
) != whole_range
.min
)
713 right_false
= remove_range(right_orig
, whole_range
.min
, rl_min(left_orig
));
716 case SPECIAL_UNSIGNED_GT
:
717 if (rl_min(right_orig
) != whole_range
.min
)
718 left_true
= remove_range(left_orig
, whole_range
.min
, rl_min(right_orig
));
719 if (rl_max(right_orig
) != whole_range
.max
)
720 left_false
= remove_range(left_orig
, rl_max(right_orig
) + 1, whole_range
.max
);
722 if (rl_max(left_orig
) != whole_range
.max
)
723 right_true
= remove_range(right_orig
, rl_max(left_orig
), whole_range
.max
);
724 if (rl_min(left_orig
) != whole_range
.min
)
725 right_false
= remove_range(right_orig
, whole_range
.min
, rl_min(left_orig
) - 1);
727 case SPECIAL_NOTEQUAL
:
728 if (rl_max(right_orig
) != whole_range
.max
)
729 left_false
= remove_range(left_false
, rl_max(right_orig
) + 1, whole_range
.max
);
730 if (rl_min(right_orig
) != whole_range
.min
)
731 left_false
= remove_range(left_false
, whole_range
.min
, rl_min(right_orig
) - 1);
732 if (rl_min(right_orig
) == rl_max(right_orig
))
733 left_true
= remove_range(left_orig
, rl_min(right_orig
), rl_min(right_orig
));
735 if (rl_max(left_orig
) != whole_range
.max
)
736 right_false
= remove_range(right_false
, rl_max(left_orig
) + 1, whole_range
.max
);
737 if (rl_min(left_orig
) != whole_range
.min
)
738 right_false
= remove_range(right_false
, whole_range
.min
, rl_min(left_orig
) - 1);
739 if (rl_min(left_orig
) == rl_max(left_orig
))
740 right_true
= remove_range(right_orig
, rl_min(left_orig
), rl_min(left_orig
));
746 left_true_state
= alloc_estate_range_list(left_true
);
747 left_false_state
= alloc_estate_range_list(left_false
);
748 right_true_state
= alloc_estate_range_list(right_true
);
749 right_false_state
= alloc_estate_range_list(right_false
);
751 if (left_postop
== SPECIAL_INCREMENT
) {
752 left_true_state
= increment_state(left_true_state
);
753 left_false_state
= increment_state(left_false_state
);
755 if (left_postop
== SPECIAL_DECREMENT
) {
756 left_true_state
= decrement_state(left_true_state
);
757 left_false_state
= decrement_state(left_false_state
);
759 if (right_postop
== SPECIAL_INCREMENT
) {
760 right_true_state
= increment_state(right_true_state
);
761 right_false_state
= increment_state(right_false_state
);
763 if (right_postop
== SPECIAL_DECREMENT
) {
764 right_true_state
= decrement_state(right_true_state
);
765 right_false_state
= decrement_state(right_false_state
);
768 set_extra_expr_true_false(left
, left_true_state
, left_false_state
);
769 set_extra_expr_true_false(right
, right_true_state
, right_false_state
);
772 /* this is actually hooked from smatch_implied.c... it's hacky, yes */
773 void __extra_match_condition(struct expression
*expr
)
777 struct smatch_state
*pre_state
;
778 struct smatch_state
*true_state
;
779 struct smatch_state
*false_state
;
781 expr
= strip_expr(expr
);
782 switch (expr
->type
) {
784 function_comparison(SPECIAL_NOTEQUAL
, expr
, 0, 1);
789 name
= get_variable_from_expr(expr
, &sym
);
792 pre_state
= get_state(my_id
, name
, sym
);
793 true_state
= add_filter(pre_state
, 0);
794 if (possibly_true(expr
, SPECIAL_EQUAL
, zero_expr()))
795 false_state
= alloc_estate(0);
797 false_state
= alloc_estate_empty();
798 set_extra_true_false(name
, sym
, true_state
, false_state
);
802 match_comparison(expr
);
804 case EXPR_ASSIGNMENT
:
805 __extra_match_condition(expr
->left
);
810 /* returns 1 if it is not possible for expr to be value, otherwise returns 0 */
811 int implied_not_equal(struct expression
*expr
, long long val
)
813 return !possibly_false(expr
, SPECIAL_NOTEQUAL
, value_expr(val
));
816 int get_implied_range_list(struct expression
*expr
, struct range_list
**rl
)
819 struct smatch_state
*state
;
825 expr
= strip_parens(expr
);
829 state
= get_state_expr(my_id
, expr
);
831 *rl
= clone_range_list(estate_ranges(state
));
835 if (expr
->type
== EXPR_CALL
) {
836 *rl
= db_return_vals(expr
);
840 if (get_implied_value(expr
, &val
)) {
841 add_range(rl
, val
, val
);
845 if (expr
->type
== EXPR_BINOP
&& expr
->op
== '%') {
846 if (!get_implied_value(expr
->right
, &val
))
848 add_range(rl
, 0, val
- 1);
852 if (!get_implied_min(expr
, &min
))
854 if (!get_implied_max(expr
, &max
))
857 *rl
= alloc_range_list(min
, max
);
861 int is_whole_range(struct smatch_state
*state
)
863 return is_whole_range_rl(estate_ranges(state
));
866 static void struct_member_callback(char *fn
, char *global_static
, int param
, char *printed_name
, struct smatch_state
*state
)
868 if (is_whole_range(state
))
870 sm_msg("info: passes param_value '%s' %d '%s' %s %s", fn
, param
, printed_name
, state
->name
, global_static
);
873 static void match_call_info(struct expression
*expr
)
875 struct range_list
*rl
= NULL
;
876 struct expression
*arg
;
880 name
= get_fnptr_name(expr
->fn
);
884 FOR_EACH_PTR(expr
->args
, arg
) {
885 if (get_implied_range_list(arg
, &rl
) && !is_whole_range_rl(rl
)) {
886 sm_msg("info: passes param_value '%s' %d '$$' %s %s",
887 name
, i
, show_ranges(rl
),
888 is_static(expr
->fn
) ? "static" : "global");
891 } END_FOR_EACH_PTR(arg
);
896 void set_param_value(const char *name
, struct symbol
*sym
, char *key
, char *value
)
898 struct range_list
*rl
= NULL
;
899 struct smatch_state
*state
;
902 if (strncmp(key
, "$$", 2))
905 snprintf(fullname
, 256, "%s%s", name
, key
+ 2);
906 get_value_ranges(value
, &rl
);
907 char *tmp
= show_ranges(rl
);
908 if (strcmp(tmp
, value
))
909 sm_msg("value = %s, ranges = %s", value
, tmp
);
910 state
= alloc_estate_range_list(rl
);
911 set_state(SMATCH_EXTRA
, fullname
, sym
, state
);
914 static void match_call_assign(struct expression
*expr
)
916 struct expression
*right
;
917 struct range_list
*rl
;
922 right
= strip_parens(expr
->right
);
923 while (right
->type
== EXPR_ASSIGNMENT
&& right
->op
== '=')
924 right
= strip_parens(right
->left
);
926 rl
= db_return_vals(right
);
928 set_extra_expr_mod(expr
->left
, alloc_estate_range_list(rl
));
930 set_extra_expr_mod(expr
->left
, extra_undefined());
933 void register_smatch_extra(int id
)
937 alloc_estate_undefined();
938 add_merge_hook(my_id
, &merge_func
);
939 add_unmatched_state_hook(my_id
, &unmatched_state
);
940 add_hook(&unop_expr
, OP_HOOK
);
941 add_hook(&match_function_def
, FUNC_DEF_HOOK
);
942 add_hook(&match_declarations
, DECLARATION_HOOK
);
944 add_hook(&match_call_info
, FUNCTION_CALL_HOOK
);
945 add_member_info_callback(my_id
, struct_member_callback
);
947 add_definition_db_callback(set_param_value
, PARAM_VALUE
);
950 void register_smatch_extra_late(int id
)
952 add_hook(&match_dereferences
, DEREF_HOOK
);
953 add_hook(&match_pointer_as_array
, OP_HOOK
);
954 add_db_fn_call_callback(DEREFERENCE
, &set_param_dereferenced
);
955 add_indirect_modification_hook(SMATCH_EXTRA
, reset_struct_members
);
956 add_hook(&match_function_call
, FUNCTION_CALL_HOOK
);
957 add_hook(&match_assign
, ASSIGNMENT_HOOK
);
958 add_hook(&match_call_assign
, CALL_ASSIGNMENT_HOOK
);