2 * Copyright (C) 2008 Dan Carpenter.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, see http://www.gnu.org/copyleft/gpl.txt
19 * smatch_extra.c is supposed to track the value of every variable.
31 #include "smatch_slist.h"
32 #include "smatch_extra.h"
37 struct string_list
*__ignored_macros
= NULL
;
38 static int in_warn_on_macro(void)
40 struct statement
*stmt
;
44 stmt
= get_current_statement();
47 macro
= get_macro_name(stmt
->pos
);
51 FOR_EACH_PTR(__ignored_macros
, tmp
) {
52 if (!strcmp(tmp
, macro
))
54 } END_FOR_EACH_PTR(tmp
);
58 typedef void (mod_hook
)(const char *name
, struct symbol
*sym
, struct smatch_state
*state
);
59 DECLARE_PTR_LIST(void_fn_list
, mod_hook
*);
60 static struct void_fn_list
*extra_mod_hooks
;
61 void add_extra_mod_hook(mod_hook
*fn
)
63 mod_hook
**p
= malloc(sizeof(mod_hook
*));
65 add_ptr_list(&extra_mod_hooks
, p
);
68 void call_extra_mod_hooks(const char *name
, struct symbol
*sym
, struct smatch_state
*state
)
72 FOR_EACH_PTR(extra_mod_hooks
, fn
) {
73 (*fn
)(name
, sym
, state
);
74 } END_FOR_EACH_PTR(fn
);
77 struct sm_state
*set_extra_mod_helper(const char *name
, struct symbol
*sym
, struct smatch_state
*state
)
79 remove_from_equiv(name
, sym
);
80 call_extra_mod_hooks(name
, sym
, state
);
81 if (__in_fake_assign
&& estate_is_unknown(state
) && !get_state(SMATCH_EXTRA
, name
, sym
))
83 return set_state(SMATCH_EXTRA
, name
, sym
, state
);
86 static char *get_other_name_sym(const char *name
, struct symbol
*sym
, struct symbol
**new_sym
)
88 struct expression
*assigned
;
89 char *orig_name
= NULL
;
99 skip
= strlen(sym
->ident
->name
);
100 if (name
[skip
] != '-' || name
[skip
+ 1] != '>')
104 assigned
= get_assigned_expr_name_sym(sym
->ident
->name
, sym
);
107 if (assigned
->type
== EXPR_PREOP
|| assigned
->op
== '&') {
109 orig_name
= expr_to_var_sym(assigned
, new_sym
);
110 if (!orig_name
|| !*new_sym
)
113 snprintf(buf
, sizeof(buf
), "%s.%s", orig_name
+ 1, name
+ skip
);
114 ret
= alloc_string(buf
);
115 free_string(orig_name
);
119 if (assigned
->type
!= EXPR_DEREF
)
122 orig_name
= expr_to_var_sym(assigned
, new_sym
);
123 if (!orig_name
|| !*new_sym
)
126 snprintf(buf
, sizeof(buf
), "%s->%s", orig_name
, name
+ skip
);
127 ret
= alloc_string(buf
);
128 free_string(orig_name
);
132 free_string(orig_name
);
136 struct sm_state
*set_extra_mod(const char *name
, struct symbol
*sym
, struct smatch_state
*state
)
139 struct symbol
*new_sym
;
142 if (in_warn_on_macro())
144 sm
= set_extra_mod_helper(name
, sym
, state
);
145 new_name
= get_other_name_sym(name
, sym
, &new_sym
);
146 if (new_name
&& new_sym
)
147 set_extra_mod_helper(new_name
, new_sym
, state
);
148 free_string(new_name
);
152 struct sm_state
*set_extra_expr_mod(struct expression
*expr
, struct smatch_state
*state
)
156 struct sm_state
*ret
= NULL
;
158 expr
= strip_expr(expr
);
159 name
= expr_to_var_sym(expr
, &sym
);
162 ret
= set_extra_mod(name
, sym
, state
);
168 void set_extra_nomod(const char *name
, struct symbol
*sym
, struct smatch_state
*state
)
171 struct symbol
*new_sym
;
172 struct relation
*rel
;
173 struct smatch_state
*orig_state
;
175 orig_state
= get_state(SMATCH_EXTRA
, name
, sym
);
177 new_name
= get_other_name_sym(name
, sym
, &new_sym
);
178 if (new_name
&& new_sym
)
179 set_state(SMATCH_EXTRA
, new_name
, new_sym
, state
);
180 free_string(new_name
);
182 if (!estate_related(orig_state
)) {
183 set_state(SMATCH_EXTRA
, name
, sym
, state
);
187 set_related(state
, estate_related(orig_state
));
188 FOR_EACH_PTR(estate_related(orig_state
), rel
) {
189 if (option_debug_related
)
190 sm_msg("%s updating related %s to %s", name
, rel
->name
, state
->name
);
191 set_state(SMATCH_EXTRA
, rel
->name
, rel
->sym
, state
);
192 } END_FOR_EACH_PTR(rel
);
196 * This is for return_implies_state() hooks which modify a SMATCH_EXTRA state
198 void set_extra_expr_nomod(struct expression
*expr
, struct smatch_state
*state
)
203 name
= expr_to_var_sym(expr
, &sym
);
206 set_extra_nomod(name
, sym
, state
);
212 static void set_extra_true_false(const char *name
, struct symbol
*sym
,
213 struct smatch_state
*true_state
,
214 struct smatch_state
*false_state
)
217 struct symbol
*new_sym
;
218 struct relation
*rel
;
219 struct smatch_state
*orig_state
;
221 if (in_warn_on_macro())
224 new_name
= get_other_name_sym(name
, sym
, &new_sym
);
225 if (new_name
&& new_sym
)
226 set_true_false_states(SMATCH_EXTRA
, new_name
, new_sym
, true_state
, false_state
);
227 free_string(new_name
);
229 orig_state
= get_state(SMATCH_EXTRA
, name
, sym
);
231 if (!estate_related(orig_state
)) {
232 set_true_false_states(SMATCH_EXTRA
, name
, sym
, true_state
, false_state
);
237 set_related(true_state
, estate_related(orig_state
));
239 set_related(false_state
, estate_related(orig_state
));
241 FOR_EACH_PTR(estate_related(orig_state
), rel
) {
242 set_true_false_states(SMATCH_EXTRA
, rel
->name
, rel
->sym
,
243 true_state
, false_state
);
244 } END_FOR_EACH_PTR(rel
);
247 static void set_extra_chunk_true_false(struct expression
*expr
,
248 struct smatch_state
*true_state
,
249 struct smatch_state
*false_state
)
251 struct var_sym_list
*vsl
;
257 if (in_warn_on_macro())
260 type
= get_type(expr
);
264 name
= expr_to_chunk_sym_vsl(expr
, &sym
, &vsl
);
267 FOR_EACH_PTR(vsl
, vs
) {
268 store_link(link_id
, vs
->var
, vs
->sym
, name
, sym
);
269 } END_FOR_EACH_PTR(vs
);
271 set_true_false_states(SMATCH_EXTRA
, name
, sym
,
272 clone_estate(true_state
),
273 clone_estate(false_state
));
278 static void set_extra_expr_true_false(struct expression
*expr
,
279 struct smatch_state
*true_state
,
280 struct smatch_state
*false_state
)
285 expr
= strip_expr(expr
);
286 name
= expr_to_var_sym(expr
, &sym
);
289 set_extra_chunk_true_false(expr
, true_state
, false_state
);
292 set_extra_true_false(name
, sym
, true_state
, false_state
);
296 static struct sm_state
*handle_canonical_while_count_down(struct statement
*loop
)
298 struct expression
*iter_var
;
299 struct expression
*condition
;
301 struct smatch_state
*estate
;
304 condition
= strip_expr(loop
->iterator_pre_condition
);
307 if (condition
->type
!= EXPR_PREOP
&& condition
->type
!= EXPR_POSTOP
)
309 if (condition
->op
!= SPECIAL_DECREMENT
)
312 iter_var
= condition
->unop
;
313 sm
= get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
316 if (sval_cmp_val(estate_min(sm
->state
), 0) < 0)
318 start
= estate_max(sm
->state
);
319 if (sval_cmp_val(start
, 0) <= 0)
321 if (!sval_is_max(start
))
324 if (condition
->type
== EXPR_PREOP
) {
325 estate
= alloc_estate_range(sval_type_val(start
.type
, 1), start
);
326 if (estate_has_hard_max(sm
->state
))
327 estate_set_hard_max(estate
);
328 estate_copy_fuzzy_max(estate
, sm
->state
);
329 set_extra_expr_mod(iter_var
, estate
);
331 if (condition
->type
== EXPR_POSTOP
) {
332 estate
= alloc_estate_range(sval_type_val(start
.type
, 0), start
);
333 if (estate_has_hard_max(sm
->state
))
334 estate_set_hard_max(estate
);
335 estate_copy_fuzzy_max(estate
, sm
->state
);
336 set_extra_expr_mod(iter_var
, estate
);
338 return get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
341 static struct sm_state
*handle_canonical_for_inc(struct expression
*iter_expr
,
342 struct expression
*condition
)
344 struct expression
*iter_var
;
346 struct smatch_state
*estate
;
347 sval_t start
, end
, max
;
349 iter_var
= iter_expr
->unop
;
350 sm
= get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
353 if (!estate_get_single_value(sm
->state
, &start
))
355 if (get_implied_max(condition
->right
, &end
))
356 end
= sval_cast(get_type(iter_var
), end
);
358 end
= sval_type_max(get_type(iter_var
));
360 if (get_sm_state_expr(SMATCH_EXTRA
, condition
->left
) != sm
)
363 switch (condition
->op
) {
364 case SPECIAL_UNSIGNED_LT
:
365 case SPECIAL_NOTEQUAL
:
367 if (!sval_is_min(end
))
370 case SPECIAL_UNSIGNED_LTE
:
376 if (sval_cmp(end
, start
) < 0)
378 estate
= alloc_estate_range(start
, end
);
379 if (get_hard_max(condition
->right
, &max
)) {
380 estate_set_hard_max(estate
);
381 if (condition
->op
== '<' ||
382 condition
->op
== SPECIAL_UNSIGNED_LT
||
383 condition
->op
== SPECIAL_NOTEQUAL
)
385 estate_set_fuzzy_max(estate
, max
);
387 set_extra_expr_mod(iter_var
, estate
);
388 return get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
391 static struct sm_state
*handle_canonical_for_dec(struct expression
*iter_expr
,
392 struct expression
*condition
)
394 struct expression
*iter_var
;
396 struct smatch_state
*estate
;
399 iter_var
= iter_expr
->unop
;
400 sm
= get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
403 if (!estate_get_single_value(sm
->state
, &start
))
405 if (!get_implied_min(condition
->right
, &end
))
406 end
= sval_type_min(get_type(iter_var
));
407 if (get_sm_state_expr(SMATCH_EXTRA
, condition
->left
) != sm
)
410 switch (condition
->op
) {
411 case SPECIAL_NOTEQUAL
:
413 if (!sval_is_min(end
) && !sval_is_max(end
))
421 if (sval_cmp(end
, start
) > 0)
423 estate
= alloc_estate_range(end
, start
);
424 estate_set_hard_max(estate
);
425 estate_set_fuzzy_max(estate
, estate_get_fuzzy_max(estate
));
426 set_extra_expr_mod(iter_var
, estate
);
427 return get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
430 static struct sm_state
*handle_canonical_for_loops(struct statement
*loop
)
432 struct expression
*iter_expr
;
433 struct expression
*condition
;
435 if (!loop
->iterator_post_statement
)
437 if (loop
->iterator_post_statement
->type
!= STMT_EXPRESSION
)
439 iter_expr
= loop
->iterator_post_statement
->expression
;
440 if (!loop
->iterator_pre_condition
)
442 if (loop
->iterator_pre_condition
->type
!= EXPR_COMPARE
)
444 condition
= loop
->iterator_pre_condition
;
446 if (iter_expr
->op
== SPECIAL_INCREMENT
)
447 return handle_canonical_for_inc(iter_expr
, condition
);
448 if (iter_expr
->op
== SPECIAL_DECREMENT
)
449 return handle_canonical_for_dec(iter_expr
, condition
);
453 struct sm_state
*__extra_handle_canonical_loops(struct statement
*loop
, struct stree
**stree
)
455 struct sm_state
*ret
;
457 __push_fake_cur_stree();
458 if (!loop
->iterator_post_statement
)
459 ret
= handle_canonical_while_count_down(loop
);
461 ret
= handle_canonical_for_loops(loop
);
462 *stree
= __pop_fake_cur_stree();
466 int __iterator_unchanged(struct sm_state
*sm
)
470 if (get_sm_state(my_id
, sm
->name
, sm
->sym
) == sm
)
475 static void while_count_down_after(struct sm_state
*sm
, struct expression
*condition
)
479 /* paranoid checking. prolly not needed */
480 condition
= strip_expr(condition
);
483 if (condition
->type
!= EXPR_PREOP
&& condition
->type
!= EXPR_POSTOP
)
485 if (condition
->op
!= SPECIAL_DECREMENT
)
487 after_value
= estate_min(sm
->state
);
489 set_extra_mod(sm
->name
, sm
->sym
, alloc_estate_sval(after_value
));
492 void __extra_pre_loop_hook_after(struct sm_state
*sm
,
493 struct statement
*iterator
,
494 struct expression
*condition
)
496 struct expression
*iter_expr
;
498 struct smatch_state
*state
;
501 while_count_down_after(sm
, condition
);
505 iter_expr
= iterator
->expression
;
507 if (condition
->type
!= EXPR_COMPARE
)
509 if (iter_expr
->op
== SPECIAL_INCREMENT
) {
510 limit
= sval_binop(estate_max(sm
->state
), '+',
511 sval_type_val(estate_type(sm
->state
), 1));
513 limit
= sval_binop(estate_min(sm
->state
), '-',
514 sval_type_val(estate_type(sm
->state
), 1));
516 if (!estate_has_hard_max(sm
->state
) && !__has_breaks()) {
517 if (iter_expr
->op
== SPECIAL_INCREMENT
)
518 state
= alloc_estate_range(estate_min(sm
->state
), limit
);
520 state
= alloc_estate_range(limit
, estate_max(sm
->state
));
522 state
= alloc_estate_sval(limit
);
524 if (!estate_has_hard_max(sm
->state
)) {
525 estate_clear_hard_max(state
);
527 if (estate_has_fuzzy_max(sm
->state
)) {
528 sval_t hmax
= estate_get_fuzzy_max(sm
->state
);
529 sval_t max
= estate_max(sm
->state
);
531 if (sval_cmp(hmax
, max
) != 0)
532 estate_clear_fuzzy_max(state
);
533 } else if (!estate_has_fuzzy_max(sm
->state
)) {
534 estate_clear_fuzzy_max(state
);
537 set_extra_mod(sm
->name
, sm
->sym
, state
);
540 static struct stree
*unmatched_stree
;
541 static struct smatch_state
*unmatched_state(struct sm_state
*sm
)
543 struct smatch_state
*state
;
545 if (unmatched_stree
) {
546 state
= get_state_stree(unmatched_stree
, SMATCH_EXTRA
, sm
->name
, sm
->sym
);
550 if (parent_is_gone_var_sym(sm
->name
, sm
->sym
))
551 return alloc_estate_empty();
552 return alloc_estate_whole(estate_type(sm
->state
));
555 static void clear_the_pointed_at(struct expression
*expr
)
560 struct sm_state
*tmp
;
562 name
= expr_to_var_sym(expr
, &sym
);
566 stree
= __get_cur_stree();
567 FOR_EACH_MY_SM(SMATCH_EXTRA
, stree
, tmp
) {
568 if (tmp
->name
[0] != '*')
572 if (strcmp(tmp
->name
+ 1, name
) != 0)
574 set_extra_mod(tmp
->name
, tmp
->sym
, alloc_estate_whole(estate_type(tmp
->state
)));
575 } END_FOR_EACH_SM(tmp
);
581 static void match_function_call(struct expression
*expr
)
583 struct expression
*arg
;
584 struct expression
*tmp
;
586 /* if we have the db this is handled in smatch_function_hooks.c */
589 if (inlinable(expr
->fn
))
592 FOR_EACH_PTR(expr
->args
, arg
) {
593 tmp
= strip_expr(arg
);
594 if (tmp
->type
== EXPR_PREOP
&& tmp
->op
== '&')
595 set_extra_expr_mod(tmp
->unop
, alloc_estate_whole(get_type(tmp
->unop
)));
597 clear_the_pointed_at(tmp
);
598 } END_FOR_EACH_PTR(arg
);
601 static int types_equiv_or_pointer(struct symbol
*one
, struct symbol
*two
)
605 if (one
->type
== SYM_PTR
&& two
->type
== SYM_PTR
)
607 return types_equiv(one
, two
);
610 static void save_chunk_info(struct expression
*left
, struct expression
*right
)
612 struct var_sym_list
*vsl
;
614 struct expression
*add_expr
;
620 if (right
->type
!= EXPR_BINOP
|| right
->op
!= '-')
622 if (!get_value(right
->left
, &sval
))
624 if (!expr_to_sym(right
->right
))
627 add_expr
= binop_expression(left
, '+', right
->right
);
628 type
= get_type(add_expr
);
631 name
= expr_to_chunk_sym_vsl(add_expr
, &sym
, &vsl
);
634 FOR_EACH_PTR(vsl
, vs
) {
635 store_link(link_id
, vs
->var
, vs
->sym
, name
, sym
);
636 } END_FOR_EACH_PTR(vs
);
638 set_state(SMATCH_EXTRA
, name
, sym
, alloc_estate_sval(sval_cast(type
, sval
)));
643 static void match_vanilla_assign(struct expression
*left
, struct expression
*right
)
645 struct range_list
*rl
= NULL
;
646 struct symbol
*right_sym
;
647 struct symbol
*left_type
;
648 struct symbol
*right_type
;
649 char *right_name
= NULL
;
653 struct smatch_state
*state
;
658 save_chunk_info(left
, right
);
660 name
= expr_to_var_sym(left
, &sym
);
664 left_type
= get_type(left
);
665 right_type
= get_type(right
);
667 right_name
= expr_to_var_sym(right
, &right_sym
);
669 if (!__in_fake_assign
&&
670 !(right
->type
== EXPR_PREOP
&& right
->op
== '&') &&
671 right_name
&& right_sym
&&
672 types_equiv_or_pointer(left_type
, right_type
) &&
673 !has_symbol(right
, sym
)) {
674 set_equiv(left
, right
);
678 if (is_pointer(right
) && get_address_rl(right
, &rl
)) {
679 state
= alloc_estate_rl(rl
);
680 } else if (get_implied_rl(right
, &rl
)) {
681 rl
= cast_rl(left_type
, rl
);
682 state
= alloc_estate_rl(rl
);
683 if (get_hard_max(right
, &max
)) {
684 estate_set_hard_max(state
);
685 estate_set_fuzzy_max(state
, max
);
688 rl
= alloc_whole_rl(right_type
);
689 rl
= cast_rl(left_type
, rl
);
690 state
= alloc_estate_rl(rl
);
692 set_extra_mod(name
, sym
, state
);
694 free_string(right_name
);
697 static int op_remove_assign(int op
)
700 case SPECIAL_ADD_ASSIGN
:
702 case SPECIAL_SUB_ASSIGN
:
704 case SPECIAL_MUL_ASSIGN
:
706 case SPECIAL_DIV_ASSIGN
:
708 case SPECIAL_MOD_ASSIGN
:
710 case SPECIAL_AND_ASSIGN
:
712 case SPECIAL_OR_ASSIGN
:
714 case SPECIAL_XOR_ASSIGN
:
716 case SPECIAL_SHL_ASSIGN
:
717 return SPECIAL_LEFTSHIFT
;
718 case SPECIAL_SHR_ASSIGN
:
719 return SPECIAL_RIGHTSHIFT
;
725 static void match_assign(struct expression
*expr
)
727 struct range_list
*rl
= NULL
;
728 struct expression
*left
;
729 struct expression
*right
;
730 struct expression
*binop_expr
;
731 struct symbol
*left_type
;
732 struct symbol
*right_type
;
735 sval_t left_min
, left_max
;
736 sval_t right_min
, right_max
;
737 sval_t res_min
, res_max
;
739 left
= strip_expr(expr
->left
);
741 right
= strip_parens(expr
->right
);
742 while (right
->type
== EXPR_ASSIGNMENT
&& right
->op
== '=')
743 right
= strip_parens(right
->left
);
745 if (expr
->op
== '=' && is_condition(expr
->right
))
746 return; /* handled in smatch_condition.c */
747 if (expr
->op
== '=' && right
->type
== EXPR_CALL
)
748 return; /* handled in smatch_function_hooks.c */
749 if (expr
->op
== '=') {
750 match_vanilla_assign(left
, right
);
754 name
= expr_to_var_sym(left
, &sym
);
758 left_type
= get_type(left
);
759 right_type
= get_type(right
);
761 res_min
= sval_type_min(left_type
);
762 res_max
= sval_type_max(left_type
);
765 case SPECIAL_ADD_ASSIGN
:
766 get_absolute_max(left
, &left_max
);
767 get_absolute_max(right
, &right_max
);
768 if (sval_binop_overflows(left_max
, '+', right_max
))
770 if (get_implied_min(left
, &left_min
) &&
771 !sval_is_negative_min(left_min
) &&
772 get_implied_min(right
, &right_min
) &&
773 !sval_is_negative_min(right_min
)) {
774 res_min
= sval_binop(left_min
, '+', right_min
);
775 res_min
= sval_cast(right_type
, res_min
);
777 if (inside_loop()) /* we are assuming loops don't lead to wrapping */
779 res_max
= sval_binop(left_max
, '+', right_max
);
780 res_max
= sval_cast(right_type
, res_max
);
782 case SPECIAL_SUB_ASSIGN
:
783 if (get_implied_max(left
, &left_max
) &&
784 !sval_is_max(left_max
) &&
785 get_implied_min(right
, &right_min
) &&
786 !sval_is_min(right_min
)) {
787 res_max
= sval_binop(left_max
, '-', right_min
);
788 res_max
= sval_cast(right_type
, res_max
);
792 if (get_implied_min(left
, &left_min
) &&
793 !sval_is_min(left_min
) &&
794 get_implied_max(right
, &right_max
) &&
795 !sval_is_max(right_max
)) {
796 res_min
= sval_binop(left_min
, '-', right_max
);
797 res_min
= sval_cast(right_type
, res_min
);
800 case SPECIAL_AND_ASSIGN
:
801 case SPECIAL_MOD_ASSIGN
:
802 case SPECIAL_SHL_ASSIGN
:
803 case SPECIAL_SHR_ASSIGN
:
804 case SPECIAL_OR_ASSIGN
:
805 case SPECIAL_XOR_ASSIGN
:
806 case SPECIAL_MUL_ASSIGN
:
807 case SPECIAL_DIV_ASSIGN
:
808 binop_expr
= binop_expression(expr
->left
,
809 op_remove_assign(expr
->op
),
811 if (get_absolute_rl(binop_expr
, &rl
)) {
812 rl
= cast_rl(left_type
, rl
);
813 set_extra_mod(name
, sym
, alloc_estate_rl(rl
));
818 rl
= cast_rl(left_type
, alloc_rl(res_min
, res_max
));
819 set_extra_mod(name
, sym
, alloc_estate_rl(rl
));
824 static struct smatch_state
*increment_state(struct smatch_state
*state
)
826 sval_t min
= estate_min(state
);
827 sval_t max
= estate_max(state
);
829 if (!estate_rl(state
))
833 max
= sval_type_max(max
.type
);
835 if (!sval_is_min(min
) && !sval_is_max(min
))
837 if (!sval_is_min(max
) && !sval_is_max(max
))
839 return alloc_estate_range(min
, max
);
842 static struct smatch_state
*decrement_state(struct smatch_state
*state
)
844 sval_t min
= estate_min(state
);
845 sval_t max
= estate_max(state
);
847 if (!estate_rl(state
))
851 min
= sval_type_min(min
.type
);
853 if (!sval_is_min(min
) && !sval_is_max(min
))
855 if (!sval_is_min(max
) && !sval_is_max(max
))
857 return alloc_estate_range(min
, max
);
860 static void unop_expr(struct expression
*expr
)
862 struct smatch_state
*state
;
864 if (expr
->smatch_flags
& Handled
)
868 case SPECIAL_INCREMENT
:
869 state
= get_state_expr(SMATCH_EXTRA
, expr
->unop
);
870 state
= increment_state(state
);
872 state
= alloc_estate_whole(get_type(expr
));
873 set_extra_expr_mod(expr
->unop
, state
);
875 case SPECIAL_DECREMENT
:
876 state
= get_state_expr(SMATCH_EXTRA
, expr
->unop
);
877 state
= decrement_state(state
);
879 state
= alloc_estate_whole(get_type(expr
));
880 set_extra_expr_mod(expr
->unop
, state
);
887 static void asm_expr(struct statement
*stmt
)
890 struct expression
*expr
;
894 FOR_EACH_PTR(stmt
->asm_outputs
, expr
) {
896 case 0: /* identifier */
897 case 1: /* constraint */
900 case 2: /* expression */
902 type
= get_type(strip_expr(expr
));
903 set_extra_expr_mod(expr
, alloc_estate_whole(type
));
906 } END_FOR_EACH_PTR(expr
);
909 static void check_dereference(struct expression
*expr
)
911 if (outside_of_function())
913 set_extra_expr_nomod(expr
, alloc_estate_range(valid_ptr_min_sval
, valid_ptr_max_sval
));
916 static void match_dereferences(struct expression
*expr
)
918 if (expr
->type
!= EXPR_PREOP
)
920 check_dereference(expr
->unop
);
923 static void match_pointer_as_array(struct expression
*expr
)
927 check_dereference(get_array_base(expr
));
930 static void set_param_dereferenced(struct expression
*arg
, char *key
, char *unused
)
935 name
= get_variable_from_key(arg
, key
, &sym
);
939 set_extra_nomod(name
, sym
, alloc_estate_range(valid_ptr_min_sval
, valid_ptr_max_sval
));
945 static sval_t
add_one(sval_t sval
)
951 static sval_t
sub_one(sval_t sval
)
957 static void handle_comparison(struct symbol
*type
, struct expression
*left
, int op
, struct expression
*right
)
959 struct range_list
*left_orig
;
960 struct range_list
*left_true
;
961 struct range_list
*left_false
;
962 struct range_list
*right_orig
;
963 struct range_list
*right_true
;
964 struct range_list
*right_false
;
965 struct smatch_state
*left_true_state
;
966 struct smatch_state
*left_false_state
;
967 struct smatch_state
*right_true_state
;
968 struct smatch_state
*right_false_state
;
969 sval_t min
, max
, dummy
, hard_max
;
971 int right_postop
= 0;
973 if (left
->op
== SPECIAL_INCREMENT
|| left
->op
== SPECIAL_DECREMENT
) {
974 if (left
->type
== EXPR_POSTOP
) {
975 left
->smatch_flags
|= Handled
;
976 left_postop
= left
->op
;
978 left
= strip_expr(left
->unop
);
980 while (left
->type
== EXPR_ASSIGNMENT
)
981 left
= strip_expr(left
->left
);
983 if (right
->op
== SPECIAL_INCREMENT
|| right
->op
== SPECIAL_DECREMENT
) {
984 if (right
->type
== EXPR_POSTOP
) {
985 right
->smatch_flags
|= Handled
;
986 right_postop
= right
->op
;
988 right
= strip_expr(right
->unop
);
991 if (get_implied_rl(left
, &left_orig
)) {
992 left_orig
= cast_rl(type
, left_orig
);
994 min
= sval_type_min(get_type(left
));
995 max
= sval_type_max(get_type(left
));
996 left_orig
= cast_rl(type
, alloc_rl(min
, max
));
999 if (get_implied_rl(right
, &right_orig
)) {
1000 right_orig
= cast_rl(type
, right_orig
);
1002 min
= sval_type_min(get_type(right
));
1003 max
= sval_type_max(get_type(right
));
1004 right_orig
= cast_rl(type
, alloc_rl(min
, max
));
1006 min
= sval_type_min(type
);
1007 max
= sval_type_max(type
);
1009 left_true
= clone_rl(left_orig
);
1010 left_false
= clone_rl(left_orig
);
1011 right_true
= clone_rl(right_orig
);
1012 right_false
= clone_rl(right_orig
);
1016 case SPECIAL_UNSIGNED_LT
:
1017 left_true
= remove_range(left_orig
, rl_max(right_orig
), max
);
1018 if (!sval_is_min(rl_min(right_orig
))) {
1019 left_false
= remove_range(left_orig
, min
, sub_one(rl_min(right_orig
)));
1022 right_true
= remove_range(right_orig
, min
, rl_min(left_orig
));
1023 if (!sval_is_max(rl_max(left_orig
)))
1024 right_false
= remove_range(right_orig
, add_one(rl_max(left_orig
)), max
);
1026 case SPECIAL_UNSIGNED_LTE
:
1028 if (!sval_is_max(rl_max(right_orig
)))
1029 left_true
= remove_range(left_orig
, add_one(rl_max(right_orig
)), max
);
1030 left_false
= remove_range(left_orig
, min
, rl_min(right_orig
));
1032 if (!sval_is_min(rl_min(left_orig
)))
1033 right_true
= remove_range(right_orig
, min
, sub_one(rl_min(left_orig
)));
1034 right_false
= remove_range(right_orig
, rl_max(left_orig
), max
);
1036 if (sval_cmp(rl_min(left_orig
), rl_min(right_orig
)) == 0)
1037 left_false
= remove_range(left_false
, rl_min(left_orig
), rl_min(left_orig
));
1038 if (sval_cmp(rl_max(left_orig
), rl_max(right_orig
)) == 0)
1039 right_false
= remove_range(right_false
, rl_max(left_orig
), rl_max(left_orig
));
1042 if (!sval_is_max(rl_max(right_orig
))) {
1043 left_true
= remove_range(left_true
, add_one(rl_max(right_orig
)), max
);
1045 if (!sval_is_min(rl_min(right_orig
))) {
1046 left_true
= remove_range(left_true
, min
, sub_one(rl_min(right_orig
)));
1048 if (sval_cmp(rl_min(right_orig
), rl_max(right_orig
)) == 0)
1049 left_false
= remove_range(left_orig
, rl_min(right_orig
), rl_min(right_orig
));
1051 if (!sval_is_max(rl_max(left_orig
)))
1052 right_true
= remove_range(right_true
, add_one(rl_max(left_orig
)), max
);
1053 if (!sval_is_min(rl_min(left_orig
)))
1054 right_true
= remove_range(right_true
, min
, sub_one(rl_min(left_orig
)));
1055 if (sval_cmp(rl_min(left_orig
), rl_max(left_orig
)) == 0)
1056 right_false
= remove_range(right_orig
, rl_min(left_orig
), rl_min(left_orig
));
1058 case SPECIAL_UNSIGNED_GTE
:
1060 if (!sval_is_min(rl_min(right_orig
)))
1061 left_true
= remove_range(left_orig
, min
, sub_one(rl_min(right_orig
)));
1062 left_false
= remove_range(left_orig
, rl_max(right_orig
), max
);
1064 if (!sval_is_max(rl_max(left_orig
)))
1065 right_true
= remove_range(right_orig
, add_one(rl_max(left_orig
)), max
);
1066 right_false
= remove_range(right_orig
, min
, rl_min(left_orig
));
1068 if (sval_cmp(rl_min(left_orig
), rl_min(right_orig
)) == 0)
1069 right_false
= remove_range(right_false
, rl_min(left_orig
), rl_min(left_orig
));
1070 if (sval_cmp(rl_max(left_orig
), rl_max(right_orig
)) == 0)
1071 left_false
= remove_range(left_false
, rl_max(left_orig
), rl_max(left_orig
));
1074 case SPECIAL_UNSIGNED_GT
:
1075 left_true
= remove_range(left_orig
, min
, rl_min(right_orig
));
1076 if (!sval_is_max(rl_max(right_orig
)))
1077 left_false
= remove_range(left_orig
, add_one(rl_max(right_orig
)), max
);
1079 right_true
= remove_range(right_orig
, rl_max(left_orig
), max
);
1080 if (!sval_is_min(rl_min(left_orig
)))
1081 right_false
= remove_range(right_orig
, min
, sub_one(rl_min(left_orig
)));
1083 case SPECIAL_NOTEQUAL
:
1084 if (!sval_is_max(rl_max(right_orig
)))
1085 left_false
= remove_range(left_false
, add_one(rl_max(right_orig
)), max
);
1086 if (!sval_is_min(rl_min(right_orig
)))
1087 left_false
= remove_range(left_false
, min
, sub_one(rl_min(right_orig
)));
1088 if (sval_cmp(rl_min(right_orig
), rl_max(right_orig
)) == 0)
1089 left_true
= remove_range(left_orig
, rl_min(right_orig
), rl_min(right_orig
));
1091 if (!sval_is_max(rl_max(left_orig
)))
1092 right_false
= remove_range(right_false
, add_one(rl_max(left_orig
)), max
);
1093 if (!sval_is_min(rl_min(left_orig
)))
1094 right_false
= remove_range(right_false
, min
, sub_one(rl_min(left_orig
)));
1095 if (sval_cmp(rl_min(left_orig
), rl_max(left_orig
)) == 0)
1096 right_true
= remove_range(right_orig
, rl_min(left_orig
), rl_min(left_orig
));
1102 left_true
= rl_truncate_cast(get_type(left
), left_true
);
1103 left_false
= rl_truncate_cast(get_type(left
), left_false
);
1104 right_true
= rl_truncate_cast(get_type(right
), right_true
);
1105 right_false
= rl_truncate_cast(get_type(right
), right_false
);
1107 left_true_state
= alloc_estate_rl(left_true
);
1108 left_false_state
= alloc_estate_rl(left_false
);
1109 right_true_state
= alloc_estate_rl(right_true
);
1110 right_false_state
= alloc_estate_rl(right_false
);
1114 case SPECIAL_UNSIGNED_LT
:
1115 case SPECIAL_UNSIGNED_LTE
:
1117 if (get_hard_max(right
, &dummy
))
1118 estate_set_hard_max(left_true_state
);
1119 if (get_hard_max(left
, &dummy
))
1120 estate_set_hard_max(right_false_state
);
1123 case SPECIAL_UNSIGNED_GT
:
1124 case SPECIAL_UNSIGNED_GTE
:
1126 if (get_hard_max(left
, &dummy
))
1127 estate_set_hard_max(right_true_state
);
1128 if (get_hard_max(right
, &dummy
))
1129 estate_set_hard_max(left_false_state
);
1135 case SPECIAL_UNSIGNED_LT
:
1136 case SPECIAL_UNSIGNED_LTE
:
1138 if (get_hard_max(right
, &hard_max
)) {
1139 if (op
== '<' || op
== SPECIAL_UNSIGNED_LT
)
1141 estate_set_fuzzy_max(left_true_state
, hard_max
);
1143 if (get_implied_value(right
, &hard_max
)) {
1144 if (op
== SPECIAL_UNSIGNED_LTE
||
1147 estate_set_fuzzy_max(left_false_state
, hard_max
);
1149 if (get_hard_max(left
, &hard_max
)) {
1150 if (op
== SPECIAL_UNSIGNED_LTE
||
1153 estate_set_fuzzy_max(right_false_state
, hard_max
);
1155 if (get_implied_value(left
, &hard_max
)) {
1156 if (op
== '<' || op
== SPECIAL_UNSIGNED_LT
)
1158 estate_set_fuzzy_max(right_true_state
, hard_max
);
1162 case SPECIAL_UNSIGNED_GT
:
1163 case SPECIAL_UNSIGNED_GTE
:
1165 if (get_hard_max(left
, &hard_max
)) {
1166 if (op
== '>' || op
== SPECIAL_UNSIGNED_GT
)
1168 estate_set_fuzzy_max(right_true_state
, hard_max
);
1170 if (get_implied_value(left
, &hard_max
)) {
1171 if (op
== SPECIAL_UNSIGNED_GTE
||
1174 estate_set_fuzzy_max(right_false_state
, hard_max
);
1176 if (get_hard_max(right
, &hard_max
)) {
1177 if (op
== SPECIAL_UNSIGNED_LTE
||
1180 estate_set_fuzzy_max(left_false_state
, hard_max
);
1182 if (get_implied_value(right
, &hard_max
)) {
1184 op
== SPECIAL_UNSIGNED_GT
)
1186 estate_set_fuzzy_max(left_true_state
, hard_max
);
1190 if (get_hard_max(left
, &hard_max
))
1191 estate_set_fuzzy_max(right_true_state
, hard_max
);
1192 if (get_hard_max(right
, &hard_max
))
1193 estate_set_fuzzy_max(left_true_state
, hard_max
);
1197 if (get_hard_max(left
, &hard_max
)) {
1198 estate_set_hard_max(left_true_state
);
1199 estate_set_hard_max(left_false_state
);
1201 if (get_hard_max(right
, &hard_max
)) {
1202 estate_set_hard_max(right_true_state
);
1203 estate_set_hard_max(right_false_state
);
1206 if (left_postop
== SPECIAL_INCREMENT
) {
1207 left_true_state
= increment_state(left_true_state
);
1208 left_false_state
= increment_state(left_false_state
);
1210 if (left_postop
== SPECIAL_DECREMENT
) {
1211 left_true_state
= decrement_state(left_true_state
);
1212 left_false_state
= decrement_state(left_false_state
);
1214 if (right_postop
== SPECIAL_INCREMENT
) {
1215 right_true_state
= increment_state(right_true_state
);
1216 right_false_state
= increment_state(right_false_state
);
1218 if (right_postop
== SPECIAL_DECREMENT
) {
1219 right_true_state
= decrement_state(right_true_state
);
1220 right_false_state
= decrement_state(right_false_state
);
1223 if (estate_rl(left_true_state
) && estates_equiv(left_true_state
, left_false_state
)) {
1224 left_true_state
= NULL
;
1225 left_false_state
= NULL
;
1228 if (estate_rl(right_true_state
) && estates_equiv(right_true_state
, right_false_state
)) {
1229 right_true_state
= NULL
;
1230 right_false_state
= NULL
;
1233 set_extra_expr_true_false(left
, left_true_state
, left_false_state
);
1234 set_extra_expr_true_false(right
, right_true_state
, right_false_state
);
1237 static int is_simple_math(struct expression
*expr
)
1241 if (expr
->type
!= EXPR_BINOP
)
1252 static void move_known_values(struct expression
**left_p
, struct expression
**right_p
)
1254 struct expression
*left
= *left_p
;
1255 struct expression
*right
= *right_p
;
1258 if (get_implied_value(left
, &sval
)) {
1259 if (!is_simple_math(right
))
1261 if (right
->op
== '*') {
1264 if (!get_value(right
->right
, &divisor
))
1266 if (divisor
.value
== 0 && sval
.value
% divisor
.value
)
1268 *left_p
= binop_expression(left
, invert_op(right
->op
), right
->right
);
1269 *right_p
= right
->left
;
1272 if (right
->op
== '+' && get_value(right
->left
, &sval
)) {
1273 *left_p
= binop_expression(left
, invert_op(right
->op
), right
->left
);
1274 *right_p
= right
->right
;
1277 if (get_value(right
->right
, &sval
)) {
1278 *left_p
= binop_expression(left
, invert_op(right
->op
), right
->right
);
1279 *right_p
= right
->left
;
1284 if (get_implied_value(right
, &sval
)) {
1285 if (!is_simple_math(left
))
1287 if (left
->op
== '*') {
1290 if (!get_value(left
->right
, &divisor
))
1292 if (divisor
.value
== 0 && sval
.value
% divisor
.value
)
1294 *right_p
= binop_expression(right
, invert_op(left
->op
), left
->right
);
1295 *left_p
= left
->left
;
1298 if (left
->op
== '+' && get_value(left
->left
, &sval
)) {
1299 *right_p
= binop_expression(right
, invert_op(left
->op
), left
->left
);
1300 *left_p
= left
->right
;
1304 if (get_value(left
->right
, &sval
)) {
1305 *right_p
= binop_expression(right
, invert_op(left
->op
), left
->right
);
1306 *left_p
= left
->left
;
1313 static int match_func_comparison(struct expression
*expr
)
1315 struct expression
*left
= strip_expr(expr
->left
);
1316 struct expression
*right
= strip_expr(expr
->right
);
1320 * fixme: think about this harder. We should always be trying to limit
1321 * the non-call side as well. If we can't determine the limitter does
1322 * that mean we aren't querying the database and are missing important
1326 if (left
->type
== EXPR_CALL
) {
1327 if (get_implied_value(left
, &sval
)) {
1328 handle_comparison(get_type(expr
), left
, expr
->op
, right
);
1331 function_comparison(left
, expr
->op
, right
);
1335 if (right
->type
== EXPR_CALL
) {
1336 if (get_implied_value(right
, &sval
)) {
1337 handle_comparison(get_type(expr
), left
, expr
->op
, right
);
1340 function_comparison(left
, expr
->op
, right
);
1347 static void match_comparison(struct expression
*expr
)
1349 struct expression
*left_orig
= strip_expr(expr
->left
);
1350 struct expression
*right_orig
= strip_expr(expr
->right
);
1351 struct expression
*left
, *right
;
1352 struct expression
*prev
;
1353 struct symbol
*type
;
1355 if (match_func_comparison(expr
))
1358 type
= get_type(expr
);
1360 type
= &llong_ctype
;
1364 move_known_values(&left
, &right
);
1365 handle_comparison(type
, left
, expr
->op
, right
);
1367 prev
= get_assigned_expr(left_orig
);
1368 if (is_simple_math(prev
) && has_variable(prev
, left_orig
) == 0) {
1371 move_known_values(&left
, &right
);
1372 handle_comparison(type
, left
, expr
->op
, right
);
1375 prev
= get_assigned_expr(right_orig
);
1376 if (is_simple_math(prev
) && has_variable(prev
, right_orig
) == 0) {
1379 move_known_values(&left
, &right
);
1380 handle_comparison(type
, left
, expr
->op
, right
);
1384 static void handle_AND_condition(struct expression
*expr
)
1386 struct range_list
*rl
= NULL
;
1389 if (get_implied_value(expr
->left
, &known
) && known
.value
> 0) {
1391 get_absolute_rl(expr
->right
, &rl
);
1392 rl
= remove_range(rl
, sval_type_val(known
.type
, 0), known
);
1393 set_extra_expr_true_false(expr
->right
, alloc_estate_rl(rl
), NULL
);
1397 if (get_implied_value(expr
->right
, &known
) && known
.value
> 0) {
1399 get_absolute_rl(expr
->left
, &rl
);
1400 rl
= remove_range(rl
, sval_type_val(known
.type
, 0), known
);
1401 set_extra_expr_true_false(expr
->left
, alloc_estate_rl(rl
), NULL
);
1406 /* this is actually hooked from smatch_implied.c... it's hacky, yes */
1407 void __extra_match_condition(struct expression
*expr
)
1411 struct smatch_state
*pre_state
;
1412 struct smatch_state
*true_state
;
1413 struct smatch_state
*false_state
;
1415 expr
= strip_expr(expr
);
1416 switch (expr
->type
) {
1418 function_comparison(expr
, SPECIAL_NOTEQUAL
, zero_expr());
1425 zero
= sval_blank(expr
);
1428 name
= expr_to_var_sym(expr
, &sym
);
1431 pre_state
= get_state(my_id
, name
, sym
);
1432 true_state
= estate_filter_sval(pre_state
, zero
);
1433 if (possibly_true(expr
, SPECIAL_EQUAL
, zero_expr()))
1434 false_state
= alloc_estate_sval(zero
);
1436 false_state
= alloc_estate_empty();
1437 set_extra_true_false(name
, sym
, true_state
, false_state
);
1442 match_comparison(expr
);
1444 case EXPR_ASSIGNMENT
:
1445 __extra_match_condition(expr
->left
);
1448 if (expr
->op
== '&')
1449 handle_AND_condition(expr
);
1454 static void assume_indexes_are_valid(struct expression
*expr
)
1456 struct expression
*array_expr
;
1458 struct expression
*offset
;
1459 struct symbol
*offset_type
;
1460 struct range_list
*rl_before
;
1461 struct range_list
*rl_after
;
1462 struct range_list
*filter
= NULL
;
1465 expr
= strip_expr(expr
);
1466 if (!is_array(expr
))
1469 offset
= get_array_offset(expr
);
1470 offset_type
= get_type(offset
);
1471 if (offset_type
&& type_signed(offset_type
)) {
1472 filter
= alloc_rl(sval_type_min(offset_type
),
1473 sval_type_val(offset_type
, -1));
1476 array_expr
= get_array_base(expr
);
1477 array_size
= get_real_array_size(array_expr
);
1478 if (array_size
> 1) {
1479 size
= sval_type_val(offset_type
, array_size
);
1480 add_range(&filter
, size
, sval_type_max(offset_type
));
1485 get_absolute_rl(offset
, &rl_before
);
1486 rl_after
= rl_filter(rl_before
, filter
);
1487 if (rl_equiv(rl_before
, rl_after
))
1489 set_extra_expr_nomod(offset
, alloc_estate_rl(rl_after
));
1492 /* returns 1 if it is not possible for expr to be value, otherwise returns 0 */
1493 int implied_not_equal(struct expression
*expr
, long long val
)
1495 return !possibly_false(expr
, SPECIAL_NOTEQUAL
, value_expr(val
));
1498 int implied_not_equal_name_sym(char *name
, struct symbol
*sym
, long long val
)
1500 struct smatch_state
*estate
;
1502 estate
= get_state(SMATCH_EXTRA
, name
, sym
);
1505 if (!rl_has_sval(estate_rl(estate
), sval_type_val(estate_type(estate
), 0)))
1510 int parent_is_null_var_sym(const char *name
, struct symbol
*sym
)
1515 struct smatch_state
*state
;
1517 strncpy(buf
, name
, sizeof(buf
) - 1);
1518 buf
[sizeof(buf
) - 1] = '\0';
1521 while (*start
== '*') {
1523 state
= get_state(SMATCH_EXTRA
, start
, sym
);
1526 if (!estate_rl(state
))
1528 if (estate_min(state
).value
== 0 &&
1529 estate_max(state
).value
== 0)
1534 while (*start
== '&')
1537 while ((end
= strrchr(start
, '-'))) {
1539 state
= get_state(SMATCH_EXTRA
, start
, sym
);
1542 if (estate_min(state
).value
== 0 &&
1543 estate_max(state
).value
== 0)
1549 int parent_is_null(struct expression
*expr
)
1555 expr
= strip_expr(expr
);
1556 var
= expr_to_var_sym(expr
, &sym
);
1559 ret
= parent_is_null_var_sym(var
, sym
);
1565 static int param_used_callback(void *found
, int argc
, char **argv
, char **azColName
)
1571 static int filter_unused_kzalloc_info(struct expression
*call
, int param
, char *printed_name
, struct sm_state
*sm
)
1576 /* for function pointers assume everything is used */
1577 if (call
->fn
->type
!= EXPR_SYMBOL
)
1581 * kzalloc() information is treated as special because so there is just
1582 * a lot of stuff initialized to zero and it makes building the database
1583 * take hours and hours.
1585 * In theory, we should just remove this line and not pass any unused
1586 * information, but I'm not sure enough that this code works so I want
1587 * to hold off on that for now.
1589 if (!estate_get_single_value(sm
->state
, &sval
) || sval
.value
!= 0)
1592 run_sql(¶m_used_callback
, &found
,
1593 "select * from call_implies where %s and type = %d and parameter = %d and key = '%s';",
1594 get_static_filter(call
->fn
->symbol
), PARAM_USED
, param
, printed_name
);
1598 /* If the database is not built yet, then assume everything is used */
1599 run_sql(¶m_used_callback
, &found
,
1600 "select * from call_implies where %s and type = %d;",
1601 get_static_filter(call
->fn
->symbol
), PARAM_USED
);
1608 static void struct_member_callback(struct expression
*call
, int param
, char *printed_name
, struct sm_state
*sm
)
1610 if (estate_is_whole(sm
->state
))
1612 if (filter_unused_kzalloc_info(call
, param
, printed_name
, sm
))
1614 sql_insert_caller_info(call
, PARAM_VALUE
, param
, printed_name
, sm
->state
->name
);
1615 if (estate_has_fuzzy_max(sm
->state
))
1616 sql_insert_caller_info(call
, FUZZY_MAX
, param
, printed_name
,
1617 sval_to_str(estate_get_fuzzy_max(sm
->state
)));
1620 static void db_limited_before(void)
1622 unmatched_stree
= clone_stree(__get_cur_stree());
1625 static void db_limited_after(void)
1627 free_stree(&unmatched_stree
);
1630 static void db_param_limit_filter(struct expression
*expr
, int param
, char *key
, char *value
, enum info_type op
)
1632 struct expression
*arg
;
1635 struct sm_state
*sm
;
1636 struct symbol
*compare_type
, *var_type
;
1637 struct range_list
*rl
;
1638 struct range_list
*limit
;
1639 struct range_list
*new;
1641 while (expr
->type
== EXPR_ASSIGNMENT
)
1642 expr
= strip_expr(expr
->right
);
1643 if (expr
->type
!= EXPR_CALL
)
1646 arg
= get_argument_from_call_expr(expr
->args
, param
);
1650 name
= get_variable_from_key(arg
, key
, &sym
);
1654 if (strcmp(key
, "$") == 0)
1655 compare_type
= get_arg_type(expr
->fn
, param
);
1657 compare_type
= get_member_type_from_key(arg
, key
);
1659 sm
= get_sm_state(SMATCH_EXTRA
, name
, sym
);
1661 rl
= estate_rl(sm
->state
);
1663 rl
= alloc_whole_rl(compare_type
);
1665 call_results_to_rl(expr
, compare_type
, value
, &limit
);
1666 new = rl_intersection(rl
, limit
);
1668 var_type
= get_member_type_from_key(arg
, key
);
1669 new = cast_rl(var_type
, new);
1671 /* We want to preserve the implications here */
1672 if (sm
&& rl_equiv(estate_rl(sm
->state
), new))
1675 if (op
== PARAM_LIMIT
)
1676 set_extra_nomod(name
, sym
, alloc_estate_rl(new));
1678 set_extra_mod(name
, sym
, alloc_estate_rl(new));
1685 static void db_param_limit(struct expression
*expr
, int param
, char *key
, char *value
)
1687 db_param_limit_filter(expr
, param
, key
, value
, PARAM_LIMIT
);
1690 static void db_param_filter(struct expression
*expr
, int param
, char *key
, char *value
)
1692 db_param_limit_filter(expr
, param
, key
, value
, PARAM_FILTER
);
1695 static void db_param_add_set(struct expression
*expr
, int param
, char *key
, char *value
, enum info_type op
)
1697 struct expression
*arg
;
1700 struct symbol
*type
;
1701 struct smatch_state
*state
;
1702 struct range_list
*new = NULL
;
1703 struct range_list
*added
= NULL
;
1705 while (expr
->type
== EXPR_ASSIGNMENT
)
1706 expr
= strip_expr(expr
->right
);
1707 if (expr
->type
!= EXPR_CALL
)
1710 arg
= get_argument_from_call_expr(expr
->args
, param
);
1713 type
= get_member_type_from_key(arg
, key
);
1714 name
= get_variable_from_key(arg
, key
, &sym
);
1718 state
= get_state(SMATCH_EXTRA
, name
, sym
);
1720 new = estate_rl(state
);
1722 call_results_to_rl(expr
, type
, value
, &added
);
1724 if (op
== PARAM_SET
)
1727 new = rl_union(new, added
);
1729 set_extra_mod(name
, sym
, alloc_estate_rl(new));
1734 static void db_param_add(struct expression
*expr
, int param
, char *key
, char *value
)
1736 db_param_add_set(expr
, param
, key
, value
, PARAM_ADD
);
1739 static void db_param_set(struct expression
*expr
, int param
, char *key
, char *value
)
1741 db_param_add_set(expr
, param
, key
, value
, PARAM_SET
);
1744 static void db_returned_member_info(struct expression
*expr
, int param
, char *key
, char *value
)
1746 struct symbol
*type
;
1749 struct range_list
*rl
;
1751 if (expr
->type
!= EXPR_ASSIGNMENT
)
1754 name
= return_state_to_var_sym(expr
, param
, key
, &sym
);
1757 type
= get_member_type_from_key(expr
->left
, key
);
1760 call_results_to_rl(expr
->right
, type
, value
, &rl
);
1761 set_extra_mod(name
, sym
, alloc_estate_rl(rl
));
1767 static char *in_terms_of_param_math(struct expression
*expr
, char *printed_name
)
1774 var
= expr_to_var_sym(expr
, &sym
);
1777 snprintf(buf
, sizeof(buf
), "%s%s", var
, printed_name
+ 2);
1779 ret
= get_value_in_terms_of_parameter_math_var_sym(buf
, sym
);
1786 static void returned_member_callback(int return_id
, char *return_ranges
, struct expression
*expr
, char *printed_name
, struct smatch_state
*state
)
1792 /* these are handled in smatch_param_filter/set/limit.c */
1793 if (printed_name
[0] != '*' &&
1794 !strchr(printed_name
, '.') && !strchr(printed_name
, '-'))
1797 if (estate_get_single_value(state
, &sval
)) {
1798 sql_insert_return_states(return_id
, return_ranges
, RETURN_VALUE
, -1,
1799 printed_name
, sval_to_str(sval
));
1803 math_str
= in_terms_of_param_math(expr
, printed_name
);
1805 snprintf(buf
, sizeof(buf
), "%s[%s]", state
->name
, math_str
);
1806 sql_insert_return_states(return_id
, return_ranges
, RETURN_VALUE
, -1,
1811 if (estate_is_whole(state
))
1814 sql_insert_return_states(return_id
, return_ranges
, RETURN_VALUE
, -1,
1815 printed_name
, state
->name
);
1818 static void match_call_info(struct expression
*expr
)
1820 struct smatch_state
*state
;
1821 struct range_list
*rl
= NULL
;
1822 struct expression
*arg
;
1823 struct symbol
*type
;
1826 FOR_EACH_PTR(expr
->args
, arg
) {
1827 type
= get_arg_type(expr
->fn
, i
);
1829 if (get_implied_rl(arg
, &rl
))
1830 rl
= cast_rl(type
, rl
);
1832 rl
= cast_rl(type
, alloc_whole_rl(get_type(arg
)));
1834 if (!is_whole_rl(rl
))
1835 sql_insert_caller_info(expr
, PARAM_VALUE
, i
, "$", show_rl(rl
));
1836 state
= get_state_expr(SMATCH_EXTRA
, arg
);
1837 if (estate_has_fuzzy_max(state
)) {
1838 sql_insert_caller_info(expr
, FUZZY_MAX
, i
, "$",
1839 sval_to_str(estate_get_fuzzy_max(state
)));
1842 } END_FOR_EACH_PTR(arg
);
1845 static void set_param_value(const char *name
, struct symbol
*sym
, char *key
, char *value
)
1847 struct range_list
*rl
= NULL
;
1848 struct smatch_state
*state
;
1849 struct symbol
*type
;
1852 if (strcmp(key
, "*$") == 0)
1853 snprintf(fullname
, sizeof(fullname
), "*%s", name
);
1854 else if (strncmp(key
, "$", 1) == 0)
1855 snprintf(fullname
, 256, "%s%s", name
, key
+ 1);
1859 type
= get_member_type_from_key(symbol_expression(sym
), key
);
1860 str_to_rl(type
, value
, &rl
);
1861 state
= alloc_estate_rl(rl
);
1862 set_state(SMATCH_EXTRA
, fullname
, sym
, state
);
1865 static void set_param_hard_max(const char *name
, struct symbol
*sym
, char *key
, char *value
)
1867 struct range_list
*rl
= NULL
;
1868 struct smatch_state
*state
;
1869 struct symbol
*type
;
1873 if (strcmp(key
, "*$") == 0)
1874 snprintf(fullname
, sizeof(fullname
), "*%s", name
);
1875 else if (strncmp(key
, "$", 1) == 0)
1876 snprintf(fullname
, 256, "%s%s", name
, key
+ 1);
1880 state
= get_state(SMATCH_EXTRA
, fullname
, sym
);
1883 type
= get_member_type_from_key(symbol_expression(sym
), key
);
1884 str_to_rl(type
, value
, &rl
);
1885 if (!rl_to_sval(rl
, &max
))
1887 estate_set_fuzzy_max(state
, max
);
1890 struct smatch_state
*get_extra_state(struct expression
*expr
)
1894 struct smatch_state
*ret
= NULL
;
1895 struct range_list
*rl
;
1897 if (is_pointer(expr
) && get_address_rl(expr
, &rl
))
1898 return alloc_estate_rl(rl
);
1900 name
= expr_to_known_chunk_sym(expr
, &sym
);
1904 ret
= get_state(SMATCH_EXTRA
, name
, sym
);
1910 void register_smatch_extra(int id
)
1914 add_merge_hook(my_id
, &merge_estates
);
1915 add_unmatched_state_hook(my_id
, &unmatched_state
);
1916 select_caller_info_hook(set_param_value
, PARAM_VALUE
);
1917 select_caller_info_hook(set_param_hard_max
, FUZZY_MAX
);
1918 select_return_states_hook(RETURN_VALUE
, &db_returned_member_info
);
1919 select_return_states_before(&db_limited_before
);
1920 select_return_states_hook(PARAM_LIMIT
, &db_param_limit
);
1921 select_return_states_hook(PARAM_FILTER
, &db_param_filter
);
1922 select_return_states_hook(PARAM_ADD
, &db_param_add
);
1923 select_return_states_hook(PARAM_SET
, &db_param_set
);
1924 select_return_states_after(&db_limited_after
);
1927 static void match_link_modify(struct sm_state
*sm
, struct expression
*mod_expr
)
1929 struct var_sym_list
*links
;
1930 struct var_sym
*tmp
;
1931 struct smatch_state
*state
;
1933 links
= sm
->state
->data
;
1935 FOR_EACH_PTR(links
, tmp
) {
1936 state
= get_state(SMATCH_EXTRA
, tmp
->var
, tmp
->sym
);
1939 set_state(SMATCH_EXTRA
, tmp
->var
, tmp
->sym
, alloc_estate_whole(estate_type(state
)));
1940 } END_FOR_EACH_PTR(tmp
);
1941 set_state(link_id
, sm
->name
, sm
->sym
, &undefined
);
1944 void register_smatch_extra_links(int id
)
1949 void register_smatch_extra_late(int id
)
1951 add_merge_hook(link_id
, &merge_link_states
);
1952 add_modification_hook(link_id
, &match_link_modify
);
1953 add_hook(&match_dereferences
, DEREF_HOOK
);
1954 add_hook(&match_pointer_as_array
, OP_HOOK
);
1955 select_call_implies_hook(DEREFERENCE
, &set_param_dereferenced
);
1956 add_hook(&match_function_call
, FUNCTION_CALL_HOOK
);
1957 add_hook(&match_assign
, ASSIGNMENT_HOOK
);
1958 add_hook(&match_assign
, GLOBAL_ASSIGNMENT_HOOK
);
1959 add_hook(&unop_expr
, OP_HOOK
);
1960 add_hook(&asm_expr
, ASM_HOOK
);
1962 add_hook(&match_call_info
, FUNCTION_CALL_HOOK
);
1963 add_member_info_callback(my_id
, struct_member_callback
);
1964 add_returned_member_callback(my_id
, returned_member_callback
);
1966 add_hook(&assume_indexes_are_valid
, OP_HOOK
);