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 sm_state
*handle_canonical_while_count_down(struct statement
*loop
)
149 struct expression
*iter_var
;
150 struct expression
*condition
;
152 struct smatch_state
*estate
;
155 condition
= strip_expr(loop
->iterator_pre_condition
);
158 if (condition
->type
!= EXPR_PREOP
&& condition
->type
!= EXPR_POSTOP
)
160 if (condition
->op
!= SPECIAL_DECREMENT
)
163 iter_var
= condition
->unop
;
164 sm
= get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
167 if (sval_cmp_val(estate_min(sm
->state
), 0) < 0)
169 start
= estate_max(sm
->state
);
170 if (sval_cmp_val(start
, 0) <= 0)
172 if (!sval_is_max(start
))
175 if (condition
->type
== EXPR_PREOP
) {
176 estate
= alloc_estate_range(sval_type_val(start
.type
, 1), start
);
177 if (estate_has_hard_max(sm
->state
))
178 estate_set_hard_max(estate
);
179 set_extra_expr_mod(iter_var
, estate
);
181 if (condition
->type
== EXPR_POSTOP
) {
182 estate
= alloc_estate_range(sval_type_val(start
.type
, 0), start
);
183 if (estate_has_hard_max(sm
->state
))
184 estate_set_hard_max(estate
);
185 set_extra_expr_mod(iter_var
, estate
);
187 return get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
190 static struct sm_state
*handle_canonical_for_inc(struct expression
*iter_expr
,
191 struct expression
*condition
)
193 struct expression
*iter_var
;
195 struct smatch_state
*estate
;
196 sval_t start
, end
, dummy
;
198 iter_var
= iter_expr
->unop
;
199 sm
= get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
202 if (!estate_get_single_value(sm
->state
, &start
))
204 if (!get_implied_max(condition
->right
, &end
))
205 end
= sval_type_max(get_type(iter_var
));
207 if (get_sm_state_expr(SMATCH_EXTRA
, condition
->left
) != sm
)
210 switch (condition
->op
) {
211 case SPECIAL_NOTEQUAL
:
213 if (!sval_is_min(end
))
221 if (sval_cmp(end
, start
) < 0)
223 estate
= alloc_estate_range(start
, end
);
224 if (get_hard_max(condition
->right
, &dummy
))
225 estate_set_hard_max(estate
);
226 set_extra_expr_mod(iter_var
, estate
);
227 return get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
230 static struct sm_state
*handle_canonical_for_dec(struct expression
*iter_expr
,
231 struct expression
*condition
)
233 struct expression
*iter_var
;
235 struct smatch_state
*estate
;
238 iter_var
= iter_expr
->unop
;
239 sm
= get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
242 if (!estate_get_single_value(sm
->state
, &start
))
244 if (!get_implied_min(condition
->right
, &end
))
245 end
= sval_type_min(get_type(iter_var
));
246 if (get_sm_state_expr(SMATCH_EXTRA
, condition
->left
) != sm
)
249 switch (condition
->op
) {
250 case SPECIAL_NOTEQUAL
:
252 if (!sval_is_min(end
) && !sval_is_max(end
))
260 if (sval_cmp(end
, start
) > 0)
262 estate
= alloc_estate_range(end
, start
);
263 estate_set_hard_max(estate
);
264 set_extra_expr_mod(iter_var
, estate
);
265 return get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
268 static struct sm_state
*handle_canonical_for_loops(struct statement
*loop
)
270 struct expression
*iter_expr
;
271 struct expression
*condition
;
273 if (!loop
->iterator_post_statement
)
275 if (loop
->iterator_post_statement
->type
!= STMT_EXPRESSION
)
277 iter_expr
= loop
->iterator_post_statement
->expression
;
278 if (!loop
->iterator_pre_condition
)
280 if (loop
->iterator_pre_condition
->type
!= EXPR_COMPARE
)
282 condition
= loop
->iterator_pre_condition
;
284 if (iter_expr
->op
== SPECIAL_INCREMENT
)
285 return handle_canonical_for_inc(iter_expr
, condition
);
286 if (iter_expr
->op
== SPECIAL_DECREMENT
)
287 return handle_canonical_for_dec(iter_expr
, condition
);
291 struct sm_state
*__extra_handle_canonical_loops(struct statement
*loop
, struct state_list
**slist
)
293 struct sm_state
*ret
;
295 __push_fake_cur_slist();
296 if (!loop
->iterator_post_statement
)
297 ret
= handle_canonical_while_count_down(loop
);
299 ret
= handle_canonical_for_loops(loop
);
300 *slist
= __pop_fake_cur_slist();
304 int __iterator_unchanged(struct sm_state
*sm
)
308 if (get_sm_state(my_id
, sm
->name
, sm
->sym
) == sm
)
313 static void while_count_down_after(struct sm_state
*sm
, struct expression
*condition
)
317 /* paranoid checking. prolly not needed */
318 condition
= strip_expr(condition
);
321 if (condition
->type
!= EXPR_PREOP
&& condition
->type
!= EXPR_POSTOP
)
323 if (condition
->op
!= SPECIAL_DECREMENT
)
325 after_value
= estate_min(sm
->state
);
327 set_extra_mod(sm
->name
, sm
->sym
, alloc_estate(after_value
));
330 void __extra_pre_loop_hook_after(struct sm_state
*sm
,
331 struct statement
*iterator
,
332 struct expression
*condition
)
334 struct expression
*iter_expr
;
336 struct smatch_state
*state
;
339 while_count_down_after(sm
, condition
);
343 iter_expr
= iterator
->expression
;
345 if (condition
->type
!= EXPR_COMPARE
)
347 if (iter_expr
->op
== SPECIAL_INCREMENT
) {
348 limit
= sval_binop(estate_max(sm
->state
), '+',
349 sval_type_val(estate_type(sm
->state
), 1));
351 limit
= sval_binop(estate_min(sm
->state
), '-',
352 sval_type_val(estate_type(sm
->state
), 1));
354 if (!estate_has_hard_max(sm
->state
) && !__has_breaks()) {
355 if (iter_expr
->op
== SPECIAL_INCREMENT
)
356 state
= alloc_estate_range(estate_min(sm
->state
), limit
);
358 state
= alloc_estate_range(limit
, estate_max(sm
->state
));
360 state
= alloc_estate(limit
);
362 if (!estate_has_hard_max(sm
->state
))
363 estate_clear_hard_max(state
);
364 set_extra_mod(sm
->name
, sm
->sym
, state
);
367 static struct smatch_state
*unmatched_state(struct sm_state
*sm
)
369 return extra_undefined(estate_type(sm
->state
));
372 static void match_function_call(struct expression
*expr
)
374 struct expression
*arg
;
375 struct expression
*tmp
;
377 FOR_EACH_PTR(expr
->args
, arg
) {
378 tmp
= strip_expr(arg
);
379 if (tmp
->type
== EXPR_PREOP
&& tmp
->op
== '&') {
380 remove_from_equiv_expr(tmp
->unop
);
381 set_state_expr(SMATCH_EXTRA
, tmp
->unop
, extra_undefined(get_type(tmp
->unop
)));
383 } END_FOR_EACH_PTR(arg
);
386 static int types_equiv_or_pointer(struct symbol
*one
, struct symbol
*two
)
390 if (one
->type
== SYM_PTR
&& two
->type
== SYM_PTR
)
392 return types_equiv(one
, two
);
395 static void match_assign(struct expression
*expr
)
397 struct range_list
*rl
= NULL
;
398 struct expression
*left
;
399 struct expression
*right
;
400 struct symbol
*right_sym
;
401 char *right_name
= NULL
;
406 sval_t right_min
, right_max
;
409 if (is_condition(expr
->right
))
411 left
= strip_expr(expr
->left
);
412 name
= get_variable_from_expr(left
, &sym
);
415 right
= strip_parens(expr
->right
);
416 while (right
->type
== EXPR_ASSIGNMENT
&& right
->op
== '=')
417 right
= strip_parens(right
->left
);
419 if (expr
->op
== '=' && right
->type
== EXPR_CALL
)
420 goto free
; /* these are handled in smatch_function_hooks.c */
422 right_name
= get_variable_from_expr(right
, &right_sym
);
423 if (expr
->op
== '=' && right_name
&& right_sym
&&
424 types_equiv_or_pointer(get_type(expr
->left
), get_type(expr
->right
))) {
425 set_equiv(left
, right
);
429 right_min
= sval_type_min(get_type(expr
->right
));
430 right_max
= sval_type_max(get_type(expr
->right
));
432 known
= get_implied_value(right
, &value
);
435 struct smatch_state
*state
;
437 if (get_implied_range_list(right
, &rl
)) {
438 rl
= cast_rl(get_type(expr
->left
), rl
);
439 state
= alloc_estate_range_list(rl
);
440 if (get_hard_max(right
, &tmp
))
441 estate_set_hard_max(state
);
443 rl
= whole_range_list(get_type(right
));
444 rl
= cast_rl(get_type(expr
->left
), rl
);
445 state
= alloc_estate_range_list(rl
);
447 set_extra_mod(name
, sym
, state
);
450 case SPECIAL_ADD_ASSIGN
:
451 if (get_implied_min(left
, &tmp
)) {
453 right_min
= sval_binop(tmp
, '+', value
);
457 if (!inside_loop() && known
&& get_implied_max(left
, &tmp
))
458 right_max
= sval_binop(tmp
, '+', value
);
460 case SPECIAL_SUB_ASSIGN
:
461 if (get_implied_max(left
, &tmp
)) {
463 right_max
= sval_binop(tmp
, '-', value
);
467 if (!inside_loop() && known
&& get_implied_min(left
, &tmp
))
468 right_min
= sval_binop(tmp
, '-', value
);
471 if (!sval_is_min(right_min
) || !sval_is_max(right_max
))
472 rl
= cast_rl(get_type(expr
->left
), alloc_range_list(right_min
, right_max
));
474 rl
= whole_range_list(get_type(expr
->left
));
475 set_extra_mod(name
, sym
, alloc_estate_range_list(rl
));
477 free_string(right_name
);
481 static void reset_struct_members(struct sm_state
*sm
)
483 set_extra_mod(sm
->name
, sm
->sym
, extra_undefined(estate_type(sm
->state
)));
486 static struct smatch_state
*increment_state(struct smatch_state
*state
)
488 sval_t min
= estate_min(state
);
489 sval_t max
= estate_max(state
);
491 if (!estate_ranges(state
))
495 max
= sval_type_max(max
.type
);
497 if (!sval_is_min(min
) && !sval_is_max(min
))
499 if (!sval_is_min(max
) && !sval_is_max(max
))
501 return alloc_estate_range(min
, max
);
504 static struct smatch_state
*decrement_state(struct smatch_state
*state
)
506 sval_t min
= estate_min(state
);
507 sval_t max
= estate_max(state
);
509 if (!estate_ranges(state
))
513 min
= sval_type_min(min
.type
);
515 if (!sval_is_min(min
) && !sval_is_max(min
))
517 if (!sval_is_min(max
) && !sval_is_max(max
))
519 return alloc_estate_range(min
, max
);
522 static void unop_expr(struct expression
*expr
)
524 struct smatch_state
*state
;
526 if (expr
->smatch_flags
& Handled
)
530 case SPECIAL_INCREMENT
:
531 state
= get_state_expr(SMATCH_EXTRA
, expr
->unop
);
532 state
= increment_state(state
);
534 state
= extra_undefined(get_type(expr
));
535 set_extra_expr_mod(expr
->unop
, state
);
537 case SPECIAL_DECREMENT
:
538 state
= get_state_expr(SMATCH_EXTRA
, expr
->unop
);
539 state
= decrement_state(state
);
541 state
= extra_undefined(get_type(expr
));
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(get_type(expr
)));
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(get_real_base_type(sym
)));
591 scoped_state_extra(name
, sym
);
596 static void check_dereference(struct expression
*expr
)
598 set_extra_expr_nomod(expr
, alloc_estate_range(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(get_real_base_type(arg
)));
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(right
, &sval
))
640 function_comparison(expr
->op
, left
, sval
, 1);
644 if (right
->type
== EXPR_CALL
) {
645 if (!get_implied_value(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
*left_orig
;
672 struct range_list
*left_true
;
673 struct range_list
*left_false
;
674 struct range_list
*right_orig
;
675 struct range_list
*right_true
;
676 struct range_list
*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
;
681 sval_t min
, max
, dummy
;
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
);
695 while (left
->type
== EXPR_ASSIGNMENT
)
696 left
= strip_expr(left
->left
);
698 if (right
->op
== SPECIAL_INCREMENT
|| right
->op
== SPECIAL_DECREMENT
) {
699 if (right
->type
== EXPR_POSTOP
) {
700 right
->smatch_flags
|= Handled
;
701 right_postop
= right
->op
;
703 right
= strip_expr(right
->unop
);
706 type
= get_type(expr
);
710 if (get_implied_range_list(left
, &left_orig
)) {
711 left_orig
= cast_rl(type
, left_orig
);
713 min
= sval_type_min(get_type(left
));
714 max
= sval_type_max(get_type(left
));
715 left_orig
= cast_rl(type
, alloc_range_list(min
, max
));
718 if (get_implied_range_list(right
, &right_orig
)) {
719 right_orig
= cast_rl(type
, right_orig
);
721 min
= sval_type_min(get_type(right
));
722 max
= sval_type_max(get_type(right
));
723 right_orig
= cast_rl(type
, alloc_range_list(min
, max
));
725 min
= sval_type_min(type
);
726 max
= sval_type_max(type
);
728 left_true
= clone_range_list(left_orig
);
729 left_false
= clone_range_list(left_orig
);
730 right_true
= clone_range_list(right_orig
);
731 right_false
= clone_range_list(right_orig
);
735 case SPECIAL_UNSIGNED_LT
:
736 left_true
= remove_range(left_orig
, rl_max(right_orig
), max
);
737 if (!sval_is_min(rl_min(right_orig
))) {
738 left_false
= remove_range(left_orig
, min
, sub_one(rl_min(right_orig
)));
741 right_true
= remove_range(right_orig
, min
, rl_min(left_orig
));
742 if (!sval_is_max(rl_max(left_orig
)))
743 right_false
= remove_range(right_orig
, add_one(rl_max(left_orig
)), max
);
745 case SPECIAL_UNSIGNED_LTE
:
747 if (!sval_is_max(rl_max(right_orig
)))
748 left_true
= remove_range(left_orig
, add_one(rl_max(right_orig
)), max
);
749 left_false
= remove_range(left_orig
, min
, rl_min(right_orig
));
751 if (!sval_is_min(rl_min(left_orig
)))
752 right_true
= remove_range(right_orig
, min
, sub_one(rl_min(left_orig
)));
753 right_false
= remove_range(right_orig
, rl_max(left_orig
), max
);
755 if (sval_cmp(rl_min(left_orig
), rl_min(right_orig
)) == 0)
756 left_false
= remove_range(left_false
, rl_min(left_orig
), rl_min(left_orig
));
757 if (sval_cmp(rl_max(left_orig
), rl_max(right_orig
)) == 0)
758 right_false
= remove_range(right_false
, rl_max(left_orig
), rl_max(left_orig
));
761 if (!sval_is_max(rl_max(right_orig
))) {
762 left_true
= remove_range(left_true
, add_one(rl_max(right_orig
)), max
);
764 if (!sval_is_min(rl_min(right_orig
))) {
765 left_true
= remove_range(left_true
, min
, sub_one(rl_min(right_orig
)));
767 if (sval_cmp(rl_min(right_orig
), rl_max(right_orig
)) == 0)
768 left_false
= remove_range(left_orig
, rl_min(right_orig
), rl_min(right_orig
));
770 if (!sval_is_max(rl_max(left_orig
)))
771 right_true
= remove_range(right_true
, add_one(rl_max(left_orig
)), max
);
772 if (!sval_is_min(rl_min(left_orig
)))
773 right_true
= remove_range(right_true
, min
, sub_one(rl_min(left_orig
)));
774 if (sval_cmp(rl_min(left_orig
), rl_max(left_orig
)) == 0)
775 right_false
= remove_range(right_orig
, rl_min(left_orig
), rl_min(left_orig
));
777 case SPECIAL_UNSIGNED_GTE
:
779 if (!sval_is_min(rl_min(right_orig
)))
780 left_true
= remove_range(left_orig
, min
, sub_one(rl_min(right_orig
)));
781 left_false
= remove_range(left_orig
, rl_max(right_orig
), max
);
783 if (!sval_is_max(rl_max(left_orig
)))
784 right_true
= remove_range(right_orig
, add_one(rl_max(left_orig
)), max
);
785 right_false
= remove_range(right_orig
, min
, rl_min(left_orig
));
787 if (sval_cmp(rl_min(left_orig
), rl_min(right_orig
)) == 0)
788 right_false
= remove_range(right_false
, rl_min(left_orig
), rl_min(left_orig
));
789 if (sval_cmp(rl_max(left_orig
), rl_max(right_orig
)) == 0)
790 left_false
= remove_range(left_false
, rl_max(left_orig
), rl_max(left_orig
));
793 case SPECIAL_UNSIGNED_GT
:
794 left_true
= remove_range(left_orig
, min
, rl_min(right_orig
));
795 if (!sval_is_max(rl_max(right_orig
)))
796 left_false
= remove_range(left_orig
, add_one(rl_max(right_orig
)), max
);
798 right_true
= remove_range(right_orig
, rl_max(left_orig
), max
);
799 if (!sval_is_min(rl_min(left_orig
)))
800 right_false
= remove_range(right_orig
, min
, sub_one(rl_min(left_orig
)));
802 case SPECIAL_NOTEQUAL
:
803 if (!sval_is_max(rl_max(right_orig
)))
804 left_false
= remove_range(left_false
, add_one(rl_max(right_orig
)), max
);
805 if (!sval_is_min(rl_min(right_orig
)))
806 left_false
= remove_range(left_false
, min
, sub_one(rl_min(right_orig
)));
807 if (sval_cmp(rl_min(right_orig
), rl_max(right_orig
)) == 0)
808 left_true
= remove_range(left_orig
, rl_min(right_orig
), rl_min(right_orig
));
810 if (!sval_is_max(rl_max(left_orig
)))
811 right_false
= remove_range(right_false
, add_one(rl_max(left_orig
)), max
);
812 if (!sval_is_min(rl_min(left_orig
)))
813 right_false
= remove_range(right_false
, min
, sub_one(rl_min(left_orig
)));
814 if (sval_cmp(rl_min(left_orig
), rl_max(left_orig
)) == 0)
815 right_true
= remove_range(right_orig
, rl_min(left_orig
), rl_min(left_orig
));
821 left_true_state
= alloc_estate_range_list(cast_rl(get_type(left
), left_true
));
822 left_false_state
= alloc_estate_range_list(cast_rl(get_type(left
), left_false
));
823 right_true_state
= alloc_estate_range_list(cast_rl(get_type(right
), right_true
));
824 right_false_state
= alloc_estate_range_list(cast_rl(get_type(right
), right_false
));
828 case SPECIAL_UNSIGNED_LT
:
829 case SPECIAL_UNSIGNED_LTE
:
831 if (get_hard_max(right
, &dummy
))
832 estate_set_hard_max(left_true_state
);
833 if (get_hard_max(left
, &dummy
))
834 estate_set_hard_max(right_false_state
);
837 case SPECIAL_UNSIGNED_GT
:
838 case SPECIAL_UNSIGNED_GTE
:
840 if (get_hard_max(left
, &dummy
))
841 estate_set_hard_max(right_true_state
);
842 if (get_hard_max(right
, &dummy
))
843 estate_set_hard_max(left_false_state
);
847 if (get_hard_max(left
, &dummy
)) {
848 estate_set_hard_max(left_true_state
);
849 estate_set_hard_max(left_false_state
);
851 if (get_hard_max(right
, &dummy
)) {
852 estate_set_hard_max(right_true_state
);
853 estate_set_hard_max(right_false_state
);
856 if (left_postop
== SPECIAL_INCREMENT
) {
857 left_true_state
= increment_state(left_true_state
);
858 left_false_state
= increment_state(left_false_state
);
860 if (left_postop
== SPECIAL_DECREMENT
) {
861 left_true_state
= decrement_state(left_true_state
);
862 left_false_state
= decrement_state(left_false_state
);
864 if (right_postop
== SPECIAL_INCREMENT
) {
865 right_true_state
= increment_state(right_true_state
);
866 right_false_state
= increment_state(right_false_state
);
868 if (right_postop
== SPECIAL_DECREMENT
) {
869 right_true_state
= decrement_state(right_true_state
);
870 right_false_state
= decrement_state(right_false_state
);
873 set_extra_expr_true_false(left
, left_true_state
, left_false_state
);
874 set_extra_expr_true_false(right
, right_true_state
, right_false_state
);
877 /* this is actually hooked from smatch_implied.c... it's hacky, yes */
878 void __extra_match_condition(struct expression
*expr
)
882 struct smatch_state
*pre_state
;
883 struct smatch_state
*true_state
;
884 struct smatch_state
*false_state
;
886 expr
= strip_expr(expr
);
887 switch (expr
->type
) {
889 function_comparison(SPECIAL_NOTEQUAL
, expr
, ll_to_sval(0), 1);
896 zero
= sval_blank(expr
);
899 name
= get_variable_from_expr(expr
, &sym
);
902 pre_state
= get_state(my_id
, name
, sym
);
903 true_state
= add_filter(pre_state
, zero
);
904 if (possibly_true(expr
, SPECIAL_EQUAL
, zero_expr()))
905 false_state
= alloc_estate(zero
);
907 false_state
= alloc_estate_empty();
908 set_extra_true_false(name
, sym
, true_state
, false_state
);
913 match_comparison(expr
);
915 case EXPR_ASSIGNMENT
:
916 __extra_match_condition(expr
->left
);
921 /* returns 1 if it is not possible for expr to be value, otherwise returns 0 */
922 int implied_not_equal(struct expression
*expr
, long long val
)
924 return !possibly_false(expr
, SPECIAL_NOTEQUAL
, value_expr(val
));
927 int is_whole_range(struct smatch_state
*state
)
929 return is_whole_range_rl(estate_ranges(state
));
932 static void struct_member_callback(char *fn
, char *global_static
, int param
, char *printed_name
, struct smatch_state
*state
)
934 if (is_whole_range(state
))
936 sm_msg("info: passes param_value '%s' %d '%s' %s %s", fn
, param
, printed_name
, state
->name
, global_static
);
939 static void db_limited_param(struct expression
*expr
, int param
, char *key
, char *value
)
941 struct expression
*arg
;
944 struct range_list
*rl
;
945 struct range_list
*limit
;
946 struct range_list
*new;
948 while (expr
->type
== EXPR_ASSIGNMENT
)
949 expr
= strip_expr(expr
->right
);
950 if (expr
->type
!= EXPR_CALL
)
953 arg
= get_argument_from_call_expr(expr
->args
, param
);
957 sm
= get_sm_state_expr(SMATCH_EXTRA
, arg
);
959 type
= get_type(arg
);
960 if (!get_implied_range_list(arg
, &rl
))
961 rl
= whole_range_list(type
);
963 parse_value_ranges_type(type
, value
, &limit
);
964 new = rl_intersection(rl
, limit
);
966 /* We want to preserve the implications here */
967 if (sm
&& range_lists_equiv(estate_ranges(sm
->state
), new))
970 set_extra_expr_nomod(arg
, alloc_estate_range_list(new));
973 static void db_returned_states_param(struct expression
*expr
, int param
, char *key
, char *value
)
975 struct expression
*arg
;
977 struct range_list
*rl
;
978 char member_name
[256];
982 while (expr
->type
== EXPR_ASSIGNMENT
)
983 expr
= strip_expr(expr
->right
);
984 if (expr
->type
!= EXPR_CALL
)
986 arg
= get_argument_from_call_expr(expr
->args
, param
);
987 arg
= strip_expr(arg
);
991 if (strcmp(key
, "*$$") == 0) {
996 if (arg
->type
== EXPR_PREOP
&& arg
->op
== '&') {
997 arg
= strip_expr(arg
->unop
);
998 name
= get_variable_from_expr(arg
, &sym
);
1000 char *tmp
= get_variable_from_expr(arg
, &sym
);
1004 snprintf(buf
, sizeof(buf
), "*%s", tmp
);
1005 name
= alloc_string(buf
);
1008 if (!name
|| !sym
) {
1012 type
= get_type(arg
);
1013 parse_value_ranges_type(type
, value
, &rl
);
1014 set_extra_mod(name
, sym
, alloc_estate_range_list(rl
));
1019 if (arg
->type
== EXPR_PREOP
&& arg
->op
== '&') {
1020 arg
= strip_expr(arg
->unop
);
1021 name
= get_variable_from_expr(arg
, &sym
);
1024 snprintf(member_name
, sizeof(member_name
), "%s.%s", name
, key
+ 4);
1026 name
= get_variable_from_expr(arg
, &sym
);
1029 snprintf(member_name
, sizeof(member_name
), "%s%s", name
, key
+ 2);
1031 type
= get_member_type_from_key(sym
, key
);
1034 parse_value_ranges_type(type
, value
, &rl
);
1035 set_extra_mod(member_name
, sym
, alloc_estate_range_list(rl
));
1040 static void db_returned_member_info(struct expression
*expr
, int param
, char *key
, char *value
)
1042 struct symbol
*type
;
1045 char member_name
[256];
1046 struct range_list
*rl
;
1048 if (expr
->type
!= EXPR_ASSIGNMENT
)
1051 name
= get_variable_from_expr(expr
->left
, &sym
);
1054 snprintf(member_name
, sizeof(member_name
), "%s%s", name
, key
+ 2);
1055 type
= get_member_type_from_key(sym
, key
);
1058 parse_value_ranges_type(type
, value
, &rl
);
1059 set_extra_mod(member_name
, sym
, alloc_estate_range_list(rl
));
1065 static void returned_member_callback(int return_id
, char *return_ranges
, char *printed_name
, struct smatch_state
*state
)
1067 if (is_whole_range(state
))
1069 sm_msg("info: return_value %d '%s' '%s' '%s' %s", return_id
,
1070 return_ranges
, printed_name
, state
->name
, global_static());
1073 static struct state_list
*start_states
;
1074 static void save_start_states(struct statement
*stmt
)
1077 start_states
= get_all_states(SMATCH_EXTRA
);
1080 static struct state_list
*get_param_changed_list(struct state_list
*source
)
1082 struct state_list
*slist
= NULL
;
1083 struct state_list
*cur
;
1084 struct sm_state
*old
, *new;
1086 cur
= get_all_states_slist(SMATCH_EXTRA
, source
);
1087 FOR_EACH_PTR(cur
, new) {
1088 old
= get_sm_state_slist(start_states
, new->owner
, new->name
, new->sym
);
1089 if (old
&& estates_equiv(old
->state
, new->state
))
1091 add_ptr_list(&slist
, new);
1092 } END_FOR_EACH_PTR(new);
1097 static void print_return_value_param(int return_id
, char *return_ranges
, struct expression
*expr
, struct state_list
*slist
)
1099 struct state_list
*my_slist
;
1100 struct sm_state
*sm
;
1105 my_slist
= get_param_changed_list(slist
);
1107 FOR_EACH_PTR(my_slist
, sm
) {
1108 if (!estate_ranges(sm
->state
))
1111 param
= get_param_num_from_sym(sm
->sym
);
1115 if (!sm
->sym
->ident
)
1117 param_name
= sm
->sym
->ident
->name
;
1118 name_len
= strlen(param_name
);
1120 if (strcmp(sm
->name
, param_name
) == 0)
1122 if (sm
->name
[name_len
] == '-' &&
1123 strncmp(sm
->name
, param_name
, name_len
) == 0) {
1124 sm_msg("info: return_value_param %d %d '%s' '$$%s' '%s' %s",
1125 return_id
, param
, return_ranges
,
1126 sm
->name
+ name_len
, sm
->state
->name
, global_static());
1127 } else if (sm
->name
[0] == '*' &&
1128 strcmp(sm
->name
+ 1, param_name
) == 0) {
1129 sm_msg("info: return_value_param %d %d '%s' '*$$' '%s' %s",
1130 return_id
, param
, return_ranges
,
1131 sm
->state
->name
, global_static());
1133 } END_FOR_EACH_PTR(sm
);
1136 static void match_end_func(void)
1138 free_slist(&start_states
);
1141 static void match_call_info(struct expression
*expr
)
1143 struct range_list
*rl
= NULL
;
1144 struct expression
*arg
;
1145 struct symbol
*type
;
1149 name
= get_fnptr_name(expr
->fn
);
1153 FOR_EACH_PTR(expr
->args
, arg
) {
1154 type
= get_arg_type(expr
->fn
, i
);
1156 if (get_implied_range_list(arg
, &rl
))
1157 rl
= cast_rl(type
, rl
);
1159 rl
= whole_range_list(type
);
1161 sm_msg("info: passes param_value '%s' %d '$$' %s %s",
1162 name
, i
, show_ranges(rl
),
1163 is_static(expr
->fn
) ? "static" : "global");
1165 } END_FOR_EACH_PTR(arg
);
1170 static void set_param_value(const char *name
, struct symbol
*sym
, char *key
, char *value
)
1172 struct range_list
*rl
= NULL
;
1173 struct smatch_state
*state
;
1174 struct symbol
*type
;
1177 if (strncmp(key
, "$$", 2))
1180 snprintf(fullname
, 256, "%s%s", name
, key
+ 2);
1181 type
= get_member_type_from_key(sym
, key
);
1182 parse_value_ranges_type(type
, value
, &rl
);
1183 state
= alloc_estate_range_list(rl
);
1184 set_state(SMATCH_EXTRA
, fullname
, sym
, state
);
1187 void register_smatch_extra(int id
)
1191 add_merge_hook(my_id
, &merge_estates
);
1192 add_unmatched_state_hook(my_id
, &unmatched_state
);
1193 add_hook(&match_function_def
, FUNC_DEF_HOOK
);
1194 add_hook(&match_declarations
, DECLARATION_HOOK
);
1195 add_definition_db_callback(set_param_value
, PARAM_VALUE
);
1196 add_db_return_states_callback(RETURN_VALUE
, &db_returned_member_info
);
1197 add_db_return_states_callback(PARAM_VALUE
, &db_returned_states_param
);
1198 add_db_return_states_callback(LIMITED_VALUE
, &db_limited_param
);
1201 void register_smatch_extra_late(int id
)
1203 add_hook(&match_dereferences
, DEREF_HOOK
);
1204 add_hook(&match_pointer_as_array
, OP_HOOK
);
1205 add_db_fn_call_callback(DEREFERENCE
, &set_param_dereferenced
);
1206 add_indirect_modification_hook(SMATCH_EXTRA
, reset_struct_members
);
1207 add_hook(&match_function_call
, FUNCTION_CALL_HOOK
);
1208 add_hook(&match_assign
, ASSIGNMENT_HOOK
);
1209 add_hook(&unop_expr
, OP_HOOK
);
1210 add_hook(&asm_expr
, ASM_HOOK
);
1213 add_hook(&match_call_info
, FUNCTION_CALL_HOOK
);
1214 add_member_info_callback(my_id
, struct_member_callback
);
1215 add_returned_member_callback(my_id
, returned_member_callback
);
1217 add_hook(&save_start_states
, STMT_HOOK
);
1218 add_returned_state_callback(&print_return_value_param
);
1219 add_hook(&match_end_func
, END_FUNC_HOOK
);