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 static void match_link_modify(struct sm_state
*sm
, struct expression
*mod_expr
);
39 struct string_list
*__ignored_macros
= NULL
;
40 static int in_warn_on_macro(void)
42 struct statement
*stmt
;
46 stmt
= get_current_statement();
49 macro
= get_macro_name(stmt
->pos
);
53 FOR_EACH_PTR(__ignored_macros
, tmp
) {
54 if (!strcmp(tmp
, macro
))
56 } END_FOR_EACH_PTR(tmp
);
60 typedef void (mod_hook
)(const char *name
, struct symbol
*sym
, struct smatch_state
*state
);
61 DECLARE_PTR_LIST(void_fn_list
, mod_hook
*);
62 static struct void_fn_list
*extra_mod_hooks
;
63 void add_extra_mod_hook(mod_hook
*fn
)
65 mod_hook
**p
= malloc(sizeof(mod_hook
*));
67 add_ptr_list(&extra_mod_hooks
, p
);
70 void call_extra_mod_hooks(const char *name
, struct symbol
*sym
, struct smatch_state
*state
)
74 FOR_EACH_PTR(extra_mod_hooks
, fn
) {
75 (*fn
)(name
, sym
, state
);
76 } END_FOR_EACH_PTR(fn
);
79 struct sm_state
*set_extra_mod_helper(const char *name
, struct symbol
*sym
, struct smatch_state
*state
)
81 remove_from_equiv(name
, sym
);
82 call_extra_mod_hooks(name
, sym
, state
);
83 if (__in_fake_assign
&& estate_is_unknown(state
) && !get_state(SMATCH_EXTRA
, name
, sym
))
85 return set_state(SMATCH_EXTRA
, name
, sym
, state
);
88 static char *get_other_name_sym(const char *name
, struct symbol
*sym
, struct symbol
**new_sym
)
90 struct expression
*assigned
;
91 char *orig_name
= NULL
;
101 skip
= strlen(sym
->ident
->name
);
102 if (name
[skip
] != '-' || name
[skip
+ 1] != '>')
106 assigned
= get_assigned_expr_name_sym(sym
->ident
->name
, sym
);
109 if (assigned
->type
== EXPR_PREOP
|| assigned
->op
== '&') {
111 orig_name
= expr_to_var_sym(assigned
, new_sym
);
112 if (!orig_name
|| !*new_sym
)
115 snprintf(buf
, sizeof(buf
), "%s.%s", orig_name
+ 1, name
+ skip
);
116 ret
= alloc_string(buf
);
117 free_string(orig_name
);
121 if (assigned
->type
!= EXPR_DEREF
)
124 orig_name
= expr_to_var_sym(assigned
, new_sym
);
125 if (!orig_name
|| !*new_sym
)
128 snprintf(buf
, sizeof(buf
), "%s->%s", orig_name
, name
+ skip
);
129 ret
= alloc_string(buf
);
130 free_string(orig_name
);
134 free_string(orig_name
);
138 struct sm_state
*set_extra_mod(const char *name
, struct symbol
*sym
, struct smatch_state
*state
)
141 struct symbol
*new_sym
;
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 static void clear_array_states(struct expression
*array
)
156 sm
= get_sm_state_expr(link_id
, array
);
158 match_link_modify(sm
, NULL
);
161 static struct sm_state
*set_extra_array_mod(struct expression
*expr
, struct smatch_state
*state
)
163 struct expression
*array
;
164 struct expression
*offset
;
165 struct var_sym_list
*vsl
;
170 struct sm_state
*ret
= NULL
;
172 array
= get_array_base(expr
);
173 offset
= get_array_offset(expr
);
175 name
= expr_to_chunk_sym_vsl(expr
, &sym
, &vsl
);
177 if (!name
|| !vsl
|| !get_value(offset
, &sval
)) {
178 clear_array_states(array
);
182 FOR_EACH_PTR(vsl
, vs
) {
183 store_link(link_id
, vs
->var
, vs
->sym
, name
, sym
);
184 } END_FOR_EACH_PTR(vs
);
186 ret
= set_state(SMATCH_EXTRA
, name
, sym
, state
);
192 struct sm_state
*set_extra_expr_mod(struct expression
*expr
, struct smatch_state
*state
)
196 struct sm_state
*ret
= NULL
;
199 return set_extra_array_mod(expr
, state
);
201 expr
= strip_expr(expr
);
202 name
= expr_to_var_sym(expr
, &sym
);
205 ret
= set_extra_mod(name
, sym
, state
);
211 void set_extra_nomod(const char *name
, struct symbol
*sym
, struct smatch_state
*state
)
214 struct symbol
*new_sym
;
215 struct relation
*rel
;
216 struct smatch_state
*orig_state
;
218 orig_state
= get_state(SMATCH_EXTRA
, name
, sym
);
220 new_name
= get_other_name_sym(name
, sym
, &new_sym
);
221 if (new_name
&& new_sym
)
222 set_state(SMATCH_EXTRA
, new_name
, new_sym
, state
);
223 free_string(new_name
);
225 if (!estate_related(orig_state
)) {
226 set_state(SMATCH_EXTRA
, name
, sym
, state
);
230 set_related(state
, estate_related(orig_state
));
231 FOR_EACH_PTR(estate_related(orig_state
), rel
) {
232 struct smatch_state
*estate
;
234 if (option_debug_related
)
235 sm_msg("%s updating related %s to %s", name
, rel
->name
, state
->name
);
236 estate
= get_state(SMATCH_EXTRA
, rel
->name
, rel
->sym
);
239 set_state(SMATCH_EXTRA
, rel
->name
, rel
->sym
, clone_estate_cast(estate_type(estate
), state
));
240 } END_FOR_EACH_PTR(rel
);
244 * This is for return_implies_state() hooks which modify a SMATCH_EXTRA state
246 void set_extra_expr_nomod(struct expression
*expr
, struct smatch_state
*state
)
251 name
= expr_to_var_sym(expr
, &sym
);
254 set_extra_nomod(name
, sym
, state
);
260 static void set_extra_true_false(const char *name
, struct symbol
*sym
,
261 struct smatch_state
*true_state
,
262 struct smatch_state
*false_state
)
265 struct symbol
*new_sym
;
266 struct relation
*rel
;
267 struct smatch_state
*orig_state
;
269 if (in_warn_on_macro())
272 new_name
= get_other_name_sym(name
, sym
, &new_sym
);
273 if (new_name
&& new_sym
)
274 set_true_false_states(SMATCH_EXTRA
, new_name
, new_sym
, true_state
, false_state
);
275 free_string(new_name
);
277 orig_state
= get_state(SMATCH_EXTRA
, name
, sym
);
279 if (!estate_related(orig_state
)) {
280 set_true_false_states(SMATCH_EXTRA
, name
, sym
, true_state
, false_state
);
285 set_related(true_state
, estate_related(orig_state
));
287 set_related(false_state
, estate_related(orig_state
));
289 FOR_EACH_PTR(estate_related(orig_state
), rel
) {
290 set_true_false_states(SMATCH_EXTRA
, rel
->name
, rel
->sym
,
291 true_state
, false_state
);
292 } END_FOR_EACH_PTR(rel
);
295 static void set_extra_chunk_true_false(struct expression
*expr
,
296 struct smatch_state
*true_state
,
297 struct smatch_state
*false_state
)
299 struct var_sym_list
*vsl
;
305 if (in_warn_on_macro())
308 type
= get_type(expr
);
312 name
= expr_to_chunk_sym_vsl(expr
, &sym
, &vsl
);
315 FOR_EACH_PTR(vsl
, vs
) {
316 store_link(link_id
, vs
->var
, vs
->sym
, name
, sym
);
317 } END_FOR_EACH_PTR(vs
);
319 set_true_false_states(SMATCH_EXTRA
, name
, sym
,
320 clone_estate(true_state
),
321 clone_estate(false_state
));
326 static void set_extra_expr_true_false(struct expression
*expr
,
327 struct smatch_state
*true_state
,
328 struct smatch_state
*false_state
)
334 if (get_value(expr
, &sval
))
337 expr
= strip_expr(expr
);
338 name
= expr_to_var_sym(expr
, &sym
);
341 set_extra_chunk_true_false(expr
, true_state
, false_state
);
344 set_extra_true_false(name
, sym
, true_state
, false_state
);
348 static struct sm_state
*handle_canonical_while_count_down(struct statement
*loop
)
350 struct expression
*iter_var
;
351 struct expression
*condition
;
353 struct smatch_state
*estate
;
356 condition
= strip_expr(loop
->iterator_pre_condition
);
359 if (condition
->type
!= EXPR_PREOP
&& condition
->type
!= EXPR_POSTOP
)
361 if (condition
->op
!= SPECIAL_DECREMENT
)
364 iter_var
= condition
->unop
;
365 sm
= get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
368 if (sval_cmp_val(estate_min(sm
->state
), 0) < 0)
370 start
= estate_max(sm
->state
);
371 if (sval_cmp_val(start
, 0) <= 0)
373 if (!sval_is_max(start
))
376 if (condition
->type
== EXPR_PREOP
) {
377 estate
= alloc_estate_range(sval_type_val(start
.type
, 1), start
);
378 if (estate_has_hard_max(sm
->state
))
379 estate_set_hard_max(estate
);
380 estate_copy_fuzzy_max(estate
, sm
->state
);
381 set_extra_expr_mod(iter_var
, estate
);
383 if (condition
->type
== EXPR_POSTOP
) {
384 estate
= alloc_estate_range(sval_type_val(start
.type
, 0), start
);
385 if (estate_has_hard_max(sm
->state
))
386 estate_set_hard_max(estate
);
387 estate_copy_fuzzy_max(estate
, sm
->state
);
388 set_extra_expr_mod(iter_var
, estate
);
390 return get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
393 static struct sm_state
*handle_canonical_for_inc(struct expression
*iter_expr
,
394 struct expression
*condition
)
396 struct expression
*iter_var
;
398 struct smatch_state
*estate
;
399 sval_t start
, end
, max
;
401 iter_var
= iter_expr
->unop
;
402 sm
= get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
405 if (!estate_get_single_value(sm
->state
, &start
))
407 if (get_implied_max(condition
->right
, &end
))
408 end
= sval_cast(get_type(iter_var
), end
);
410 end
= sval_type_max(get_type(iter_var
));
412 if (get_sm_state_expr(SMATCH_EXTRA
, condition
->left
) != sm
)
415 switch (condition
->op
) {
416 case SPECIAL_UNSIGNED_LT
:
417 case SPECIAL_NOTEQUAL
:
419 if (!sval_is_min(end
))
422 case SPECIAL_UNSIGNED_LTE
:
428 if (sval_cmp(end
, start
) < 0)
430 estate
= alloc_estate_range(start
, end
);
431 if (get_hard_max(condition
->right
, &max
)) {
432 estate_set_hard_max(estate
);
433 if (condition
->op
== '<' ||
434 condition
->op
== SPECIAL_UNSIGNED_LT
||
435 condition
->op
== SPECIAL_NOTEQUAL
)
437 estate_set_fuzzy_max(estate
, max
);
439 set_extra_expr_mod(iter_var
, estate
);
440 return get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
443 static struct sm_state
*handle_canonical_for_dec(struct expression
*iter_expr
,
444 struct expression
*condition
)
446 struct expression
*iter_var
;
448 struct smatch_state
*estate
;
451 iter_var
= iter_expr
->unop
;
452 sm
= get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
455 if (!estate_get_single_value(sm
->state
, &start
))
457 if (!get_implied_min(condition
->right
, &end
))
458 end
= sval_type_min(get_type(iter_var
));
459 if (get_sm_state_expr(SMATCH_EXTRA
, condition
->left
) != sm
)
462 switch (condition
->op
) {
463 case SPECIAL_NOTEQUAL
:
465 if (!sval_is_min(end
) && !sval_is_max(end
))
473 if (sval_cmp(end
, start
) > 0)
475 estate
= alloc_estate_range(end
, start
);
476 estate_set_hard_max(estate
);
477 estate_set_fuzzy_max(estate
, estate_get_fuzzy_max(estate
));
478 set_extra_expr_mod(iter_var
, estate
);
479 return get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
482 static struct sm_state
*handle_canonical_for_loops(struct statement
*loop
)
484 struct expression
*iter_expr
;
485 struct expression
*condition
;
487 if (!loop
->iterator_post_statement
)
489 if (loop
->iterator_post_statement
->type
!= STMT_EXPRESSION
)
491 iter_expr
= loop
->iterator_post_statement
->expression
;
492 if (!loop
->iterator_pre_condition
)
494 if (loop
->iterator_pre_condition
->type
!= EXPR_COMPARE
)
496 condition
= loop
->iterator_pre_condition
;
498 if (iter_expr
->op
== SPECIAL_INCREMENT
)
499 return handle_canonical_for_inc(iter_expr
, condition
);
500 if (iter_expr
->op
== SPECIAL_DECREMENT
)
501 return handle_canonical_for_dec(iter_expr
, condition
);
505 struct sm_state
*__extra_handle_canonical_loops(struct statement
*loop
, struct stree
**stree
)
507 struct sm_state
*ret
;
509 __push_fake_cur_stree();
510 if (!loop
->iterator_post_statement
)
511 ret
= handle_canonical_while_count_down(loop
);
513 ret
= handle_canonical_for_loops(loop
);
514 *stree
= __pop_fake_cur_stree();
518 int __iterator_unchanged(struct sm_state
*sm
)
522 if (get_sm_state(my_id
, sm
->name
, sm
->sym
) == sm
)
527 static void while_count_down_after(struct sm_state
*sm
, struct expression
*condition
)
531 /* paranoid checking. prolly not needed */
532 condition
= strip_expr(condition
);
535 if (condition
->type
!= EXPR_PREOP
&& condition
->type
!= EXPR_POSTOP
)
537 if (condition
->op
!= SPECIAL_DECREMENT
)
539 after_value
= estate_min(sm
->state
);
541 set_extra_mod(sm
->name
, sm
->sym
, alloc_estate_sval(after_value
));
544 void __extra_pre_loop_hook_after(struct sm_state
*sm
,
545 struct statement
*iterator
,
546 struct expression
*condition
)
548 struct expression
*iter_expr
;
550 struct smatch_state
*state
;
553 while_count_down_after(sm
, condition
);
557 iter_expr
= iterator
->expression
;
559 if (condition
->type
!= EXPR_COMPARE
)
561 if (iter_expr
->op
== SPECIAL_INCREMENT
) {
562 limit
= sval_binop(estate_max(sm
->state
), '+',
563 sval_type_val(estate_type(sm
->state
), 1));
565 limit
= sval_binop(estate_min(sm
->state
), '-',
566 sval_type_val(estate_type(sm
->state
), 1));
568 if (!estate_has_hard_max(sm
->state
) && !__has_breaks()) {
569 if (iter_expr
->op
== SPECIAL_INCREMENT
)
570 state
= alloc_estate_range(estate_min(sm
->state
), limit
);
572 state
= alloc_estate_range(limit
, estate_max(sm
->state
));
574 state
= alloc_estate_sval(limit
);
576 if (!estate_has_hard_max(sm
->state
)) {
577 estate_clear_hard_max(state
);
579 if (estate_has_fuzzy_max(sm
->state
)) {
580 sval_t hmax
= estate_get_fuzzy_max(sm
->state
);
581 sval_t max
= estate_max(sm
->state
);
583 if (sval_cmp(hmax
, max
) != 0)
584 estate_clear_fuzzy_max(state
);
585 } else if (!estate_has_fuzzy_max(sm
->state
)) {
586 estate_clear_fuzzy_max(state
);
589 set_extra_mod(sm
->name
, sm
->sym
, state
);
592 static struct stree
*unmatched_stree
;
593 static struct smatch_state
*unmatched_state(struct sm_state
*sm
)
595 struct smatch_state
*state
;
597 if (unmatched_stree
) {
598 state
= get_state_stree(unmatched_stree
, SMATCH_EXTRA
, sm
->name
, sm
->sym
);
602 if (parent_is_gone_var_sym(sm
->name
, sm
->sym
))
603 return alloc_estate_empty();
604 return alloc_estate_whole(estate_type(sm
->state
));
607 static void clear_the_pointed_at(struct expression
*expr
)
612 struct sm_state
*tmp
;
614 name
= expr_to_var_sym(expr
, &sym
);
618 stree
= __get_cur_stree();
619 FOR_EACH_MY_SM(SMATCH_EXTRA
, stree
, tmp
) {
620 if (tmp
->name
[0] != '*')
624 if (strcmp(tmp
->name
+ 1, name
) != 0)
626 set_extra_mod(tmp
->name
, tmp
->sym
, alloc_estate_whole(estate_type(tmp
->state
)));
627 } END_FOR_EACH_SM(tmp
);
633 static void match_function_call(struct expression
*expr
)
635 struct expression
*arg
;
636 struct expression
*tmp
;
638 /* if we have the db this is handled in smatch_function_hooks.c */
641 if (inlinable(expr
->fn
))
644 FOR_EACH_PTR(expr
->args
, arg
) {
645 tmp
= strip_expr(arg
);
646 if (tmp
->type
== EXPR_PREOP
&& tmp
->op
== '&')
647 set_extra_expr_mod(tmp
->unop
, alloc_estate_whole(get_type(tmp
->unop
)));
649 clear_the_pointed_at(tmp
);
650 } END_FOR_EACH_PTR(arg
);
653 static int values_fit_type(struct expression
*left
, struct expression
*right
)
655 struct range_list
*rl
;
658 type
= get_type(left
);
661 get_absolute_rl(right
, &rl
);
662 if (sval_cmp(sval_type_min(type
), rl_min(rl
)) > 0)
664 if (sval_cmp(sval_type_max(type
), rl_max(rl
)) < 0)
669 static void save_chunk_info(struct expression
*left
, struct expression
*right
)
671 struct var_sym_list
*vsl
;
673 struct expression
*add_expr
;
679 if (right
->type
!= EXPR_BINOP
|| right
->op
!= '-')
681 if (!get_value(right
->left
, &sval
))
683 if (!expr_to_sym(right
->right
))
686 add_expr
= binop_expression(left
, '+', right
->right
);
687 type
= get_type(add_expr
);
690 name
= expr_to_chunk_sym_vsl(add_expr
, &sym
, &vsl
);
693 FOR_EACH_PTR(vsl
, vs
) {
694 store_link(link_id
, vs
->var
, vs
->sym
, name
, sym
);
695 } END_FOR_EACH_PTR(vs
);
697 set_state(SMATCH_EXTRA
, name
, sym
, alloc_estate_sval(sval_cast(type
, sval
)));
702 static void do_array_assign(struct expression
*left
, int op
, struct expression
*right
)
704 struct range_list
*rl
;
707 get_absolute_rl(right
, &rl
);
708 rl
= cast_rl(get_type(left
), rl
);
710 rl
= alloc_whole_rl(get_type(left
));
713 set_extra_array_mod(left
, alloc_estate_rl(rl
));
716 static void match_untracked_array(struct expression
*call
, int param
)
718 struct expression
*arg
;
720 arg
= get_argument_from_call_expr(call
->args
, param
);
721 arg
= strip_expr(arg
);
723 clear_array_states(arg
);
726 static void match_vanilla_assign(struct expression
*left
, struct expression
*right
)
728 struct range_list
*rl
= NULL
;
729 struct symbol
*right_sym
;
730 struct symbol
*left_type
;
731 struct symbol
*right_type
;
732 char *right_name
= NULL
;
736 struct smatch_state
*state
;
741 save_chunk_info(left
, right
);
743 name
= expr_to_var_sym(left
, &sym
);
746 do_array_assign(left
, '=', right
);
750 left_type
= get_type(left
);
751 right_type
= get_type(right
);
753 right_name
= expr_to_var_sym(right
, &right_sym
);
755 if (!__in_fake_assign
&&
756 !(right
->type
== EXPR_PREOP
&& right
->op
== '&') &&
757 right_name
&& right_sym
&&
758 values_fit_type(left
, right
) &&
759 !has_symbol(right
, sym
)) {
760 set_equiv(left
, right
);
764 if (is_pointer(right
) && get_address_rl(right
, &rl
)) {
765 state
= alloc_estate_rl(rl
);
766 } else if (get_implied_rl(right
, &rl
)) {
767 rl
= cast_rl(left_type
, rl
);
768 state
= alloc_estate_rl(rl
);
769 if (get_hard_max(right
, &max
)) {
770 estate_set_hard_max(state
);
771 estate_set_fuzzy_max(state
, max
);
774 rl
= alloc_whole_rl(right_type
);
775 rl
= cast_rl(left_type
, rl
);
776 state
= alloc_estate_rl(rl
);
778 set_extra_mod(name
, sym
, state
);
780 free_string(right_name
);
783 static int op_remove_assign(int op
)
786 case SPECIAL_ADD_ASSIGN
:
788 case SPECIAL_SUB_ASSIGN
:
790 case SPECIAL_MUL_ASSIGN
:
792 case SPECIAL_DIV_ASSIGN
:
794 case SPECIAL_MOD_ASSIGN
:
796 case SPECIAL_AND_ASSIGN
:
798 case SPECIAL_OR_ASSIGN
:
800 case SPECIAL_XOR_ASSIGN
:
802 case SPECIAL_SHL_ASSIGN
:
803 return SPECIAL_LEFTSHIFT
;
804 case SPECIAL_SHR_ASSIGN
:
805 return SPECIAL_RIGHTSHIFT
;
811 static void match_assign(struct expression
*expr
)
813 struct range_list
*rl
= NULL
;
814 struct expression
*left
;
815 struct expression
*right
;
816 struct expression
*binop_expr
;
817 struct symbol
*left_type
;
818 struct symbol
*right_type
;
821 sval_t left_min
, left_max
;
822 sval_t right_min
, right_max
;
823 sval_t res_min
, res_max
;
825 left
= strip_expr(expr
->left
);
827 right
= strip_parens(expr
->right
);
828 if (right
->type
== EXPR_CALL
&& sym_name_is("__builtin_expect", right
->fn
))
829 right
= get_argument_from_call_expr(right
->args
, 0);
830 while (right
->type
== EXPR_ASSIGNMENT
&& right
->op
== '=')
831 right
= strip_parens(right
->left
);
833 if (expr
->op
== '=' && is_condition(expr
->right
))
834 return; /* handled in smatch_condition.c */
835 if (expr
->op
== '=' && right
->type
== EXPR_CALL
)
836 return; /* handled in smatch_function_hooks.c */
837 if (expr
->op
== '=') {
838 match_vanilla_assign(left
, right
);
842 name
= expr_to_var_sym(left
, &sym
);
846 left_type
= get_type(left
);
847 right_type
= get_type(right
);
849 res_min
= sval_type_min(left_type
);
850 res_max
= sval_type_max(left_type
);
853 case SPECIAL_ADD_ASSIGN
:
854 get_absolute_max(left
, &left_max
);
855 get_absolute_max(right
, &right_max
);
856 if (sval_binop_overflows(left_max
, '+', right_max
))
858 if (get_implied_min(left
, &left_min
) &&
859 !sval_is_negative_min(left_min
) &&
860 get_implied_min(right
, &right_min
) &&
861 !sval_is_negative_min(right_min
)) {
862 res_min
= sval_binop(left_min
, '+', right_min
);
863 res_min
= sval_cast(right_type
, res_min
);
865 if (inside_loop()) /* we are assuming loops don't lead to wrapping */
867 res_max
= sval_binop(left_max
, '+', right_max
);
868 res_max
= sval_cast(right_type
, res_max
);
870 case SPECIAL_SUB_ASSIGN
:
871 if (get_implied_max(left
, &left_max
) &&
872 !sval_is_max(left_max
) &&
873 get_implied_min(right
, &right_min
) &&
874 !sval_is_min(right_min
)) {
875 res_max
= sval_binop(left_max
, '-', right_min
);
876 res_max
= sval_cast(right_type
, res_max
);
880 if (get_implied_min(left
, &left_min
) &&
881 !sval_is_min(left_min
) &&
882 get_implied_max(right
, &right_max
) &&
883 !sval_is_max(right_max
)) {
884 res_min
= sval_binop(left_min
, '-', right_max
);
885 res_min
= sval_cast(right_type
, res_min
);
888 case SPECIAL_AND_ASSIGN
:
889 case SPECIAL_MOD_ASSIGN
:
890 case SPECIAL_SHL_ASSIGN
:
891 case SPECIAL_SHR_ASSIGN
:
892 case SPECIAL_OR_ASSIGN
:
893 case SPECIAL_XOR_ASSIGN
:
894 case SPECIAL_MUL_ASSIGN
:
895 case SPECIAL_DIV_ASSIGN
:
896 binop_expr
= binop_expression(expr
->left
,
897 op_remove_assign(expr
->op
),
899 if (get_absolute_rl(binop_expr
, &rl
)) {
900 rl
= cast_rl(left_type
, rl
);
901 set_extra_mod(name
, sym
, alloc_estate_rl(rl
));
906 rl
= cast_rl(left_type
, alloc_rl(res_min
, res_max
));
907 set_extra_mod(name
, sym
, alloc_estate_rl(rl
));
912 static struct smatch_state
*increment_state(struct smatch_state
*state
)
914 sval_t min
= estate_min(state
);
915 sval_t max
= estate_max(state
);
917 if (!estate_rl(state
))
921 max
= sval_type_max(max
.type
);
923 if (!sval_is_min(min
) && !sval_is_max(min
))
925 if (!sval_is_min(max
) && !sval_is_max(max
))
927 return alloc_estate_range(min
, max
);
930 static struct smatch_state
*decrement_state(struct smatch_state
*state
)
932 sval_t min
= estate_min(state
);
933 sval_t max
= estate_max(state
);
935 if (!estate_rl(state
))
939 min
= sval_type_min(min
.type
);
941 if (!sval_is_min(min
) && !sval_is_max(min
))
943 if (!sval_is_min(max
) && !sval_is_max(max
))
945 return alloc_estate_range(min
, max
);
948 static void unop_expr(struct expression
*expr
)
950 struct smatch_state
*state
;
952 if (expr
->smatch_flags
& Handled
)
956 case SPECIAL_INCREMENT
:
957 state
= get_state_expr(SMATCH_EXTRA
, expr
->unop
);
958 state
= increment_state(state
);
960 state
= alloc_estate_whole(get_type(expr
));
961 set_extra_expr_mod(expr
->unop
, state
);
963 case SPECIAL_DECREMENT
:
964 state
= get_state_expr(SMATCH_EXTRA
, expr
->unop
);
965 state
= decrement_state(state
);
967 state
= alloc_estate_whole(get_type(expr
));
968 set_extra_expr_mod(expr
->unop
, state
);
975 static void asm_expr(struct statement
*stmt
)
978 struct expression
*expr
;
982 FOR_EACH_PTR(stmt
->asm_outputs
, expr
) {
984 case 0: /* identifier */
985 case 1: /* constraint */
988 case 2: /* expression */
990 type
= get_type(strip_expr(expr
));
991 set_extra_expr_mod(expr
, alloc_estate_whole(type
));
994 } END_FOR_EACH_PTR(expr
);
997 static void check_dereference(struct expression
*expr
)
999 if (outside_of_function())
1001 set_extra_expr_nomod(expr
, alloc_estate_range(valid_ptr_min_sval
, valid_ptr_max_sval
));
1004 static void match_dereferences(struct expression
*expr
)
1006 if (expr
->type
!= EXPR_PREOP
)
1008 check_dereference(expr
->unop
);
1011 static void match_pointer_as_array(struct expression
*expr
)
1013 if (!is_array(expr
))
1015 check_dereference(get_array_base(expr
));
1018 static void set_param_dereferenced(struct expression
*arg
, char *key
, char *unused
)
1023 name
= get_variable_from_key(arg
, key
, &sym
);
1027 set_extra_nomod(name
, sym
, alloc_estate_range(valid_ptr_min_sval
, valid_ptr_max_sval
));
1033 static sval_t
add_one(sval_t sval
)
1039 static sval_t
sub_one(sval_t sval
)
1045 static void handle_comparison(struct symbol
*type
, struct expression
*left
, int op
, struct expression
*right
)
1047 struct range_list
*left_orig
;
1048 struct range_list
*left_true
;
1049 struct range_list
*left_false
;
1050 struct range_list
*right_orig
;
1051 struct range_list
*right_true
;
1052 struct range_list
*right_false
;
1053 struct smatch_state
*left_true_state
;
1054 struct smatch_state
*left_false_state
;
1055 struct smatch_state
*right_true_state
;
1056 struct smatch_state
*right_false_state
;
1057 sval_t min
, max
, dummy
, hard_max
;
1058 int left_postop
= 0;
1059 int right_postop
= 0;
1061 if (left
->op
== SPECIAL_INCREMENT
|| left
->op
== SPECIAL_DECREMENT
) {
1062 if (left
->type
== EXPR_POSTOP
) {
1063 left
->smatch_flags
|= Handled
;
1064 left_postop
= left
->op
;
1066 left
= strip_parens(left
->unop
);
1068 while (left
->type
== EXPR_ASSIGNMENT
)
1069 left
= strip_parens(left
->left
);
1071 if (right
->op
== SPECIAL_INCREMENT
|| right
->op
== SPECIAL_DECREMENT
) {
1072 if (right
->type
== EXPR_POSTOP
) {
1073 right
->smatch_flags
|= Handled
;
1074 right_postop
= right
->op
;
1076 right
= strip_parens(right
->unop
);
1079 if (get_implied_rl(left
, &left_orig
)) {
1080 left_orig
= cast_rl(type
, left_orig
);
1082 min
= sval_type_min(get_type(left
));
1083 max
= sval_type_max(get_type(left
));
1084 left_orig
= cast_rl(type
, alloc_rl(min
, max
));
1087 if (get_implied_rl(right
, &right_orig
)) {
1088 right_orig
= cast_rl(type
, right_orig
);
1090 min
= sval_type_min(get_type(right
));
1091 max
= sval_type_max(get_type(right
));
1092 right_orig
= cast_rl(type
, alloc_rl(min
, max
));
1094 min
= sval_type_min(type
);
1095 max
= sval_type_max(type
);
1097 left_true
= clone_rl(left_orig
);
1098 left_false
= clone_rl(left_orig
);
1099 right_true
= clone_rl(right_orig
);
1100 right_false
= clone_rl(right_orig
);
1104 case SPECIAL_UNSIGNED_LT
:
1105 left_true
= remove_range(left_orig
, rl_max(right_orig
), max
);
1106 if (!sval_is_min(rl_min(right_orig
))) {
1107 left_false
= remove_range(left_orig
, min
, sub_one(rl_min(right_orig
)));
1110 right_true
= remove_range(right_orig
, min
, rl_min(left_orig
));
1111 if (!sval_is_max(rl_max(left_orig
)))
1112 right_false
= remove_range(right_orig
, add_one(rl_max(left_orig
)), max
);
1114 case SPECIAL_UNSIGNED_LTE
:
1116 if (!sval_is_max(rl_max(right_orig
)))
1117 left_true
= remove_range(left_orig
, add_one(rl_max(right_orig
)), max
);
1118 left_false
= remove_range(left_orig
, min
, rl_min(right_orig
));
1120 if (!sval_is_min(rl_min(left_orig
)))
1121 right_true
= remove_range(right_orig
, min
, sub_one(rl_min(left_orig
)));
1122 right_false
= remove_range(right_orig
, rl_max(left_orig
), max
);
1124 if (sval_cmp(rl_min(left_orig
), rl_min(right_orig
)) == 0)
1125 left_false
= remove_range(left_false
, rl_min(left_orig
), rl_min(left_orig
));
1126 if (sval_cmp(rl_max(left_orig
), rl_max(right_orig
)) == 0)
1127 right_false
= remove_range(right_false
, rl_max(left_orig
), rl_max(left_orig
));
1130 if (!sval_is_max(rl_max(right_orig
))) {
1131 left_true
= remove_range(left_true
, add_one(rl_max(right_orig
)), max
);
1133 if (!sval_is_min(rl_min(right_orig
))) {
1134 left_true
= remove_range(left_true
, min
, sub_one(rl_min(right_orig
)));
1136 if (sval_cmp(rl_min(right_orig
), rl_max(right_orig
)) == 0)
1137 left_false
= remove_range(left_orig
, rl_min(right_orig
), rl_min(right_orig
));
1139 if (!sval_is_max(rl_max(left_orig
)))
1140 right_true
= remove_range(right_true
, add_one(rl_max(left_orig
)), max
);
1141 if (!sval_is_min(rl_min(left_orig
)))
1142 right_true
= remove_range(right_true
, min
, sub_one(rl_min(left_orig
)));
1143 if (sval_cmp(rl_min(left_orig
), rl_max(left_orig
)) == 0)
1144 right_false
= remove_range(right_orig
, rl_min(left_orig
), rl_min(left_orig
));
1146 case SPECIAL_UNSIGNED_GTE
:
1148 if (!sval_is_min(rl_min(right_orig
)))
1149 left_true
= remove_range(left_orig
, min
, sub_one(rl_min(right_orig
)));
1150 left_false
= remove_range(left_orig
, rl_max(right_orig
), max
);
1152 if (!sval_is_max(rl_max(left_orig
)))
1153 right_true
= remove_range(right_orig
, add_one(rl_max(left_orig
)), max
);
1154 right_false
= remove_range(right_orig
, min
, rl_min(left_orig
));
1156 if (sval_cmp(rl_min(left_orig
), rl_min(right_orig
)) == 0)
1157 right_false
= remove_range(right_false
, rl_min(left_orig
), rl_min(left_orig
));
1158 if (sval_cmp(rl_max(left_orig
), rl_max(right_orig
)) == 0)
1159 left_false
= remove_range(left_false
, rl_max(left_orig
), rl_max(left_orig
));
1162 case SPECIAL_UNSIGNED_GT
:
1163 left_true
= remove_range(left_orig
, min
, rl_min(right_orig
));
1164 if (!sval_is_max(rl_max(right_orig
)))
1165 left_false
= remove_range(left_orig
, add_one(rl_max(right_orig
)), max
);
1167 right_true
= remove_range(right_orig
, rl_max(left_orig
), max
);
1168 if (!sval_is_min(rl_min(left_orig
)))
1169 right_false
= remove_range(right_orig
, min
, sub_one(rl_min(left_orig
)));
1171 case SPECIAL_NOTEQUAL
:
1172 if (!sval_is_max(rl_max(right_orig
)))
1173 left_false
= remove_range(left_false
, add_one(rl_max(right_orig
)), max
);
1174 if (!sval_is_min(rl_min(right_orig
)))
1175 left_false
= remove_range(left_false
, min
, sub_one(rl_min(right_orig
)));
1176 if (sval_cmp(rl_min(right_orig
), rl_max(right_orig
)) == 0)
1177 left_true
= remove_range(left_orig
, rl_min(right_orig
), rl_min(right_orig
));
1179 if (!sval_is_max(rl_max(left_orig
)))
1180 right_false
= remove_range(right_false
, add_one(rl_max(left_orig
)), max
);
1181 if (!sval_is_min(rl_min(left_orig
)))
1182 right_false
= remove_range(right_false
, min
, sub_one(rl_min(left_orig
)));
1183 if (sval_cmp(rl_min(left_orig
), rl_max(left_orig
)) == 0)
1184 right_true
= remove_range(right_orig
, rl_min(left_orig
), rl_min(left_orig
));
1190 left_true
= rl_truncate_cast(get_type(strip_expr(left
)), left_true
);
1191 left_false
= rl_truncate_cast(get_type(strip_expr(left
)), left_false
);
1192 right_true
= rl_truncate_cast(get_type(strip_expr(right
)), right_true
);
1193 right_false
= rl_truncate_cast(get_type(strip_expr(right
)), right_false
);
1195 left_true_state
= alloc_estate_rl(left_true
);
1196 left_false_state
= alloc_estate_rl(left_false
);
1197 right_true_state
= alloc_estate_rl(right_true
);
1198 right_false_state
= alloc_estate_rl(right_false
);
1202 case SPECIAL_UNSIGNED_LT
:
1203 case SPECIAL_UNSIGNED_LTE
:
1205 if (get_hard_max(right
, &dummy
))
1206 estate_set_hard_max(left_true_state
);
1207 if (get_hard_max(left
, &dummy
))
1208 estate_set_hard_max(right_false_state
);
1211 case SPECIAL_UNSIGNED_GT
:
1212 case SPECIAL_UNSIGNED_GTE
:
1214 if (get_hard_max(left
, &dummy
))
1215 estate_set_hard_max(right_true_state
);
1216 if (get_hard_max(right
, &dummy
))
1217 estate_set_hard_max(left_false_state
);
1223 case SPECIAL_UNSIGNED_LT
:
1224 case SPECIAL_UNSIGNED_LTE
:
1226 if (get_hard_max(right
, &hard_max
)) {
1227 if (op
== '<' || op
== SPECIAL_UNSIGNED_LT
)
1229 estate_set_fuzzy_max(left_true_state
, hard_max
);
1231 if (get_implied_value(right
, &hard_max
)) {
1232 if (op
== SPECIAL_UNSIGNED_LTE
||
1235 estate_set_fuzzy_max(left_false_state
, hard_max
);
1237 if (get_hard_max(left
, &hard_max
)) {
1238 if (op
== SPECIAL_UNSIGNED_LTE
||
1241 estate_set_fuzzy_max(right_false_state
, hard_max
);
1243 if (get_implied_value(left
, &hard_max
)) {
1244 if (op
== '<' || op
== SPECIAL_UNSIGNED_LT
)
1246 estate_set_fuzzy_max(right_true_state
, hard_max
);
1250 case SPECIAL_UNSIGNED_GT
:
1251 case SPECIAL_UNSIGNED_GTE
:
1253 if (get_hard_max(left
, &hard_max
)) {
1254 if (op
== '>' || op
== SPECIAL_UNSIGNED_GT
)
1256 estate_set_fuzzy_max(right_true_state
, hard_max
);
1258 if (get_implied_value(left
, &hard_max
)) {
1259 if (op
== SPECIAL_UNSIGNED_GTE
||
1262 estate_set_fuzzy_max(right_false_state
, hard_max
);
1264 if (get_hard_max(right
, &hard_max
)) {
1265 if (op
== SPECIAL_UNSIGNED_LTE
||
1268 estate_set_fuzzy_max(left_false_state
, hard_max
);
1270 if (get_implied_value(right
, &hard_max
)) {
1272 op
== SPECIAL_UNSIGNED_GT
)
1274 estate_set_fuzzy_max(left_true_state
, hard_max
);
1278 if (get_hard_max(left
, &hard_max
))
1279 estate_set_fuzzy_max(right_true_state
, hard_max
);
1280 if (get_hard_max(right
, &hard_max
))
1281 estate_set_fuzzy_max(left_true_state
, hard_max
);
1285 if (get_hard_max(left
, &hard_max
)) {
1286 estate_set_hard_max(left_true_state
);
1287 estate_set_hard_max(left_false_state
);
1289 if (get_hard_max(right
, &hard_max
)) {
1290 estate_set_hard_max(right_true_state
);
1291 estate_set_hard_max(right_false_state
);
1294 if (left_postop
== SPECIAL_INCREMENT
) {
1295 left_true_state
= increment_state(left_true_state
);
1296 left_false_state
= increment_state(left_false_state
);
1298 if (left_postop
== SPECIAL_DECREMENT
) {
1299 left_true_state
= decrement_state(left_true_state
);
1300 left_false_state
= decrement_state(left_false_state
);
1302 if (right_postop
== SPECIAL_INCREMENT
) {
1303 right_true_state
= increment_state(right_true_state
);
1304 right_false_state
= increment_state(right_false_state
);
1306 if (right_postop
== SPECIAL_DECREMENT
) {
1307 right_true_state
= decrement_state(right_true_state
);
1308 right_false_state
= decrement_state(right_false_state
);
1311 if (estate_rl(left_true_state
) && estates_equiv(left_true_state
, left_false_state
)) {
1312 left_true_state
= NULL
;
1313 left_false_state
= NULL
;
1316 if (estate_rl(right_true_state
) && estates_equiv(right_true_state
, right_false_state
)) {
1317 right_true_state
= NULL
;
1318 right_false_state
= NULL
;
1321 set_extra_expr_true_false(left
, left_true_state
, left_false_state
);
1322 set_extra_expr_true_false(right
, right_true_state
, right_false_state
);
1325 static int is_simple_math(struct expression
*expr
)
1329 if (expr
->type
!= EXPR_BINOP
)
1340 static void move_known_values(struct expression
**left_p
, struct expression
**right_p
)
1342 struct expression
*left
= *left_p
;
1343 struct expression
*right
= *right_p
;
1346 if (get_implied_value(left
, &sval
)) {
1347 if (!is_simple_math(right
))
1349 if (right
->op
== '*') {
1352 if (!get_value(right
->right
, &divisor
))
1354 if (divisor
.value
== 0 && sval
.value
% divisor
.value
)
1356 *left_p
= binop_expression(left
, invert_op(right
->op
), right
->right
);
1357 *right_p
= right
->left
;
1360 if (right
->op
== '+' && get_value(right
->left
, &sval
)) {
1361 *left_p
= binop_expression(left
, invert_op(right
->op
), right
->left
);
1362 *right_p
= right
->right
;
1365 if (get_value(right
->right
, &sval
)) {
1366 *left_p
= binop_expression(left
, invert_op(right
->op
), right
->right
);
1367 *right_p
= right
->left
;
1372 if (get_implied_value(right
, &sval
)) {
1373 if (!is_simple_math(left
))
1375 if (left
->op
== '*') {
1378 if (!get_value(left
->right
, &divisor
))
1380 if (divisor
.value
== 0 && sval
.value
% divisor
.value
)
1382 *right_p
= binop_expression(right
, invert_op(left
->op
), left
->right
);
1383 *left_p
= left
->left
;
1386 if (left
->op
== '+' && get_value(left
->left
, &sval
)) {
1387 *right_p
= binop_expression(right
, invert_op(left
->op
), left
->left
);
1388 *left_p
= left
->right
;
1392 if (get_value(left
->right
, &sval
)) {
1393 *right_p
= binop_expression(right
, invert_op(left
->op
), left
->right
);
1394 *left_p
= left
->left
;
1401 static int match_func_comparison(struct expression
*expr
)
1403 struct expression
*left
= strip_expr(expr
->left
);
1404 struct expression
*right
= strip_expr(expr
->right
);
1408 * fixme: think about this harder. We should always be trying to limit
1409 * the non-call side as well. If we can't determine the limitter does
1410 * that mean we aren't querying the database and are missing important
1414 if (left
->type
== EXPR_CALL
) {
1415 if (get_implied_value(left
, &sval
)) {
1416 handle_comparison(get_type(expr
), left
, expr
->op
, right
);
1419 function_comparison(left
, expr
->op
, right
);
1423 if (right
->type
== EXPR_CALL
) {
1424 if (get_implied_value(right
, &sval
)) {
1425 handle_comparison(get_type(expr
), left
, expr
->op
, right
);
1428 function_comparison(left
, expr
->op
, right
);
1435 static void match_comparison(struct expression
*expr
)
1437 struct expression
*left_orig
= strip_parens(expr
->left
);
1438 struct expression
*right_orig
= strip_parens(expr
->right
);
1439 struct expression
*left
, *right
;
1440 struct expression
*prev
;
1441 struct symbol
*type
;
1443 if (match_func_comparison(expr
))
1446 type
= get_type(expr
);
1448 type
= &llong_ctype
;
1452 move_known_values(&left
, &right
);
1453 handle_comparison(type
, left
, expr
->op
, right
);
1455 prev
= get_assigned_expr(left_orig
);
1456 if (is_simple_math(prev
) && has_variable(prev
, left_orig
) == 0) {
1459 move_known_values(&left
, &right
);
1460 handle_comparison(type
, left
, expr
->op
, right
);
1463 prev
= get_assigned_expr(right_orig
);
1464 if (is_simple_math(prev
) && has_variable(prev
, right_orig
) == 0) {
1467 move_known_values(&left
, &right
);
1468 handle_comparison(type
, left
, expr
->op
, right
);
1472 static void handle_AND_condition(struct expression
*expr
)
1474 struct range_list
*rl
= NULL
;
1477 if (get_implied_value(expr
->left
, &known
) && known
.value
> 0) {
1479 get_absolute_rl(expr
->right
, &rl
);
1480 rl
= remove_range(rl
, sval_type_val(known
.type
, 0), known
);
1481 set_extra_expr_true_false(expr
->right
, alloc_estate_rl(rl
), NULL
);
1485 if (get_implied_value(expr
->right
, &known
) && known
.value
> 0) {
1487 get_absolute_rl(expr
->left
, &rl
);
1488 rl
= remove_range(rl
, sval_type_val(known
.type
, 0), known
);
1489 set_extra_expr_true_false(expr
->left
, alloc_estate_rl(rl
), NULL
);
1494 /* this is actually hooked from smatch_implied.c... it's hacky, yes */
1495 void __extra_match_condition(struct expression
*expr
)
1497 struct smatch_state
*pre_state
;
1498 struct smatch_state
*true_state
;
1499 struct smatch_state
*false_state
;
1501 expr
= strip_expr(expr
);
1502 switch (expr
->type
) {
1504 function_comparison(expr
, SPECIAL_NOTEQUAL
, zero_expr());
1511 zero
= sval_blank(expr
);
1514 pre_state
= get_extra_state(expr
);
1515 true_state
= estate_filter_sval(pre_state
, zero
);
1516 if (possibly_true(expr
, SPECIAL_EQUAL
, zero_expr()))
1517 false_state
= alloc_estate_sval(zero
);
1519 false_state
= alloc_estate_empty();
1520 set_extra_expr_true_false(expr
, true_state
, false_state
);
1524 match_comparison(expr
);
1526 case EXPR_ASSIGNMENT
:
1527 __extra_match_condition(expr
->left
);
1530 if (expr
->op
== '&')
1531 handle_AND_condition(expr
);
1536 static void assume_indexes_are_valid(struct expression
*expr
)
1538 struct expression
*array_expr
;
1540 struct expression
*offset
;
1541 struct symbol
*offset_type
;
1542 struct range_list
*rl_before
;
1543 struct range_list
*rl_after
;
1544 struct range_list
*filter
= NULL
;
1547 expr
= strip_expr(expr
);
1548 if (!is_array(expr
))
1551 offset
= get_array_offset(expr
);
1552 offset_type
= get_type(offset
);
1553 if (offset_type
&& type_signed(offset_type
)) {
1554 filter
= alloc_rl(sval_type_min(offset_type
),
1555 sval_type_val(offset_type
, -1));
1558 array_expr
= get_array_base(expr
);
1559 array_size
= get_real_array_size(array_expr
);
1560 if (array_size
> 1) {
1561 size
= sval_type_val(offset_type
, array_size
);
1562 add_range(&filter
, size
, sval_type_max(offset_type
));
1567 get_absolute_rl(offset
, &rl_before
);
1568 rl_after
= rl_filter(rl_before
, filter
);
1569 if (rl_equiv(rl_before
, rl_after
))
1571 set_extra_expr_nomod(offset
, alloc_estate_rl(rl_after
));
1574 /* returns 1 if it is not possible for expr to be value, otherwise returns 0 */
1575 int implied_not_equal(struct expression
*expr
, long long val
)
1577 return !possibly_false(expr
, SPECIAL_NOTEQUAL
, value_expr(val
));
1580 int implied_not_equal_name_sym(char *name
, struct symbol
*sym
, long long val
)
1582 struct smatch_state
*estate
;
1584 estate
= get_state(SMATCH_EXTRA
, name
, sym
);
1587 if (!rl_has_sval(estate_rl(estate
), sval_type_val(estate_type(estate
), 0)))
1592 int parent_is_null_var_sym(const char *name
, struct symbol
*sym
)
1597 struct smatch_state
*state
;
1599 strncpy(buf
, name
, sizeof(buf
) - 1);
1600 buf
[sizeof(buf
) - 1] = '\0';
1603 while (*start
== '*') {
1605 state
= get_state(SMATCH_EXTRA
, start
, sym
);
1608 if (!estate_rl(state
))
1610 if (estate_min(state
).value
== 0 &&
1611 estate_max(state
).value
== 0)
1616 while (*start
== '&')
1619 while ((end
= strrchr(start
, '-'))) {
1621 state
= get_state(SMATCH_EXTRA
, start
, sym
);
1624 if (estate_min(state
).value
== 0 &&
1625 estate_max(state
).value
== 0)
1631 int parent_is_null(struct expression
*expr
)
1637 expr
= strip_expr(expr
);
1638 var
= expr_to_var_sym(expr
, &sym
);
1641 ret
= parent_is_null_var_sym(var
, sym
);
1647 static int param_used_callback(void *found
, int argc
, char **argv
, char **azColName
)
1653 static int filter_unused_kzalloc_info(struct expression
*call
, int param
, char *printed_name
, struct sm_state
*sm
)
1658 /* for function pointers assume everything is used */
1659 if (call
->fn
->type
!= EXPR_SYMBOL
)
1663 * kzalloc() information is treated as special because so there is just
1664 * a lot of stuff initialized to zero and it makes building the database
1665 * take hours and hours.
1667 * In theory, we should just remove this line and not pass any unused
1668 * information, but I'm not sure enough that this code works so I want
1669 * to hold off on that for now.
1671 if (!estate_get_single_value(sm
->state
, &sval
) || sval
.value
!= 0)
1674 run_sql(¶m_used_callback
, &found
,
1675 "select * from call_implies where %s and type = %d and parameter = %d and key = '%s';",
1676 get_static_filter(call
->fn
->symbol
), PARAM_USED
, param
, printed_name
);
1680 /* If the database is not built yet, then assume everything is used */
1681 run_sql(¶m_used_callback
, &found
,
1682 "select * from call_implies where %s and type = %d;",
1683 get_static_filter(call
->fn
->symbol
), PARAM_USED
);
1690 static void struct_member_callback(struct expression
*call
, int param
, char *printed_name
, struct sm_state
*sm
)
1692 if (estate_is_whole(sm
->state
))
1694 if (filter_unused_kzalloc_info(call
, param
, printed_name
, sm
))
1696 sql_insert_caller_info(call
, PARAM_VALUE
, param
, printed_name
, sm
->state
->name
);
1697 if (estate_has_fuzzy_max(sm
->state
))
1698 sql_insert_caller_info(call
, FUZZY_MAX
, param
, printed_name
,
1699 sval_to_str(estate_get_fuzzy_max(sm
->state
)));
1702 static void db_limited_before(void)
1704 unmatched_stree
= clone_stree(__get_cur_stree());
1707 static void db_limited_after(void)
1709 free_stree(&unmatched_stree
);
1712 static void db_param_limit_filter(struct expression
*expr
, int param
, char *key
, char *value
, enum info_type op
)
1714 struct expression
*arg
;
1717 struct sm_state
*sm
;
1718 struct symbol
*compare_type
, *var_type
;
1719 struct range_list
*rl
;
1720 struct range_list
*limit
;
1721 struct range_list
*new;
1723 while (expr
->type
== EXPR_ASSIGNMENT
)
1724 expr
= strip_expr(expr
->right
);
1725 if (expr
->type
!= EXPR_CALL
)
1728 arg
= get_argument_from_call_expr(expr
->args
, param
);
1732 name
= get_variable_from_key(arg
, key
, &sym
);
1736 if (strcmp(key
, "$") == 0)
1737 compare_type
= get_arg_type(expr
->fn
, param
);
1739 compare_type
= get_member_type_from_key(arg
, key
);
1741 sm
= get_sm_state(SMATCH_EXTRA
, name
, sym
);
1743 rl
= estate_rl(sm
->state
);
1745 rl
= alloc_whole_rl(compare_type
);
1747 call_results_to_rl(expr
, compare_type
, value
, &limit
);
1748 new = rl_intersection(rl
, limit
);
1750 var_type
= get_member_type_from_key(arg
, key
);
1751 new = cast_rl(var_type
, new);
1753 /* We want to preserve the implications here */
1754 if (sm
&& rl_equiv(estate_rl(sm
->state
), new))
1757 if (op
== PARAM_LIMIT
)
1758 set_extra_nomod(name
, sym
, alloc_estate_rl(new));
1760 set_extra_mod(name
, sym
, alloc_estate_rl(new));
1767 static void db_param_limit(struct expression
*expr
, int param
, char *key
, char *value
)
1769 db_param_limit_filter(expr
, param
, key
, value
, PARAM_LIMIT
);
1772 static void db_param_filter(struct expression
*expr
, int param
, char *key
, char *value
)
1774 db_param_limit_filter(expr
, param
, key
, value
, PARAM_FILTER
);
1777 static void db_param_add_set(struct expression
*expr
, int param
, char *key
, char *value
, enum info_type op
)
1779 struct expression
*arg
;
1782 struct symbol
*type
;
1783 struct smatch_state
*state
;
1784 struct range_list
*new = NULL
;
1785 struct range_list
*added
= NULL
;
1787 while (expr
->type
== EXPR_ASSIGNMENT
)
1788 expr
= strip_expr(expr
->right
);
1789 if (expr
->type
!= EXPR_CALL
)
1792 arg
= get_argument_from_call_expr(expr
->args
, param
);
1795 type
= get_member_type_from_key(arg
, key
);
1796 name
= get_variable_from_key(arg
, key
, &sym
);
1800 state
= get_state(SMATCH_EXTRA
, name
, sym
);
1802 new = estate_rl(state
);
1804 call_results_to_rl(expr
, type
, value
, &added
);
1806 if (op
== PARAM_SET
)
1809 new = rl_union(new, added
);
1811 set_extra_mod(name
, sym
, alloc_estate_rl(new));
1816 static void db_param_add(struct expression
*expr
, int param
, char *key
, char *value
)
1818 db_param_add_set(expr
, param
, key
, value
, PARAM_ADD
);
1821 static void db_param_set(struct expression
*expr
, int param
, char *key
, char *value
)
1823 db_param_add_set(expr
, param
, key
, value
, PARAM_SET
);
1826 static void match_call_info(struct expression
*expr
)
1828 struct smatch_state
*state
;
1829 struct range_list
*rl
= NULL
;
1830 struct expression
*arg
;
1831 struct symbol
*type
;
1834 FOR_EACH_PTR(expr
->args
, arg
) {
1835 type
= get_arg_type(expr
->fn
, i
);
1837 if (get_implied_rl(arg
, &rl
))
1838 rl
= cast_rl(type
, rl
);
1840 rl
= cast_rl(type
, alloc_whole_rl(get_type(arg
)));
1842 if (!is_whole_rl(rl
))
1843 sql_insert_caller_info(expr
, PARAM_VALUE
, i
, "$", show_rl(rl
));
1844 state
= get_state_expr(SMATCH_EXTRA
, arg
);
1845 if (estate_has_fuzzy_max(state
)) {
1846 sql_insert_caller_info(expr
, FUZZY_MAX
, i
, "$",
1847 sval_to_str(estate_get_fuzzy_max(state
)));
1850 } END_FOR_EACH_PTR(arg
);
1853 static void set_param_value(const char *name
, struct symbol
*sym
, char *key
, char *value
)
1855 struct range_list
*rl
= NULL
;
1856 struct smatch_state
*state
;
1857 struct symbol
*type
;
1860 if (strcmp(key
, "*$") == 0)
1861 snprintf(fullname
, sizeof(fullname
), "*%s", name
);
1862 else if (strncmp(key
, "$", 1) == 0)
1863 snprintf(fullname
, 256, "%s%s", name
, key
+ 1);
1867 type
= get_member_type_from_key(symbol_expression(sym
), key
);
1868 str_to_rl(type
, value
, &rl
);
1869 state
= alloc_estate_rl(rl
);
1870 set_state(SMATCH_EXTRA
, fullname
, sym
, state
);
1873 static void set_param_hard_max(const char *name
, struct symbol
*sym
, char *key
, char *value
)
1875 struct range_list
*rl
= NULL
;
1876 struct smatch_state
*state
;
1877 struct symbol
*type
;
1881 if (strcmp(key
, "*$") == 0)
1882 snprintf(fullname
, sizeof(fullname
), "*%s", name
);
1883 else if (strncmp(key
, "$", 1) == 0)
1884 snprintf(fullname
, 256, "%s%s", name
, key
+ 1);
1888 state
= get_state(SMATCH_EXTRA
, fullname
, sym
);
1891 type
= get_member_type_from_key(symbol_expression(sym
), key
);
1892 str_to_rl(type
, value
, &rl
);
1893 if (!rl_to_sval(rl
, &max
))
1895 estate_set_fuzzy_max(state
, max
);
1898 struct smatch_state
*get_extra_state(struct expression
*expr
)
1902 struct smatch_state
*ret
= NULL
;
1903 struct range_list
*rl
;
1905 if (is_pointer(expr
) && get_address_rl(expr
, &rl
))
1906 return alloc_estate_rl(rl
);
1908 name
= expr_to_known_chunk_sym(expr
, &sym
);
1912 ret
= get_state(SMATCH_EXTRA
, name
, sym
);
1918 void register_smatch_extra(int id
)
1922 add_merge_hook(my_id
, &merge_estates
);
1923 add_unmatched_state_hook(my_id
, &unmatched_state
);
1924 select_caller_info_hook(set_param_value
, PARAM_VALUE
);
1925 select_caller_info_hook(set_param_hard_max
, FUZZY_MAX
);
1926 select_return_states_before(&db_limited_before
);
1927 select_return_states_hook(PARAM_LIMIT
, &db_param_limit
);
1928 select_return_states_hook(PARAM_FILTER
, &db_param_filter
);
1929 select_return_states_hook(PARAM_ADD
, &db_param_add
);
1930 select_return_states_hook(PARAM_SET
, &db_param_set
);
1931 select_return_states_after(&db_limited_after
);
1934 static void match_link_modify(struct sm_state
*sm
, struct expression
*mod_expr
)
1936 struct var_sym_list
*links
;
1937 struct var_sym
*tmp
;
1938 struct smatch_state
*state
;
1940 links
= sm
->state
->data
;
1942 FOR_EACH_PTR(links
, tmp
) {
1943 state
= get_state(SMATCH_EXTRA
, tmp
->var
, tmp
->sym
);
1946 set_state(SMATCH_EXTRA
, tmp
->var
, tmp
->sym
, alloc_estate_whole(estate_type(state
)));
1947 } END_FOR_EACH_PTR(tmp
);
1948 set_state(link_id
, sm
->name
, sm
->sym
, &undefined
);
1951 void register_smatch_extra_links(int id
)
1956 void register_smatch_extra_late(int id
)
1958 add_merge_hook(link_id
, &merge_link_states
);
1959 add_modification_hook(link_id
, &match_link_modify
);
1960 add_hook(&match_dereferences
, DEREF_HOOK
);
1961 add_hook(&match_pointer_as_array
, OP_HOOK
);
1962 select_call_implies_hook(DEREFERENCE
, &set_param_dereferenced
);
1963 add_hook(&match_function_call
, FUNCTION_CALL_HOOK
);
1964 add_hook(&match_assign
, ASSIGNMENT_HOOK
);
1965 add_hook(&match_assign
, GLOBAL_ASSIGNMENT_HOOK
);
1966 add_hook(&unop_expr
, OP_HOOK
);
1967 add_hook(&asm_expr
, ASM_HOOK
);
1968 add_untracked_param_hook(&match_untracked_array
);
1970 add_hook(&match_call_info
, FUNCTION_CALL_HOOK
);
1971 add_member_info_callback(my_id
, struct_member_callback
);
1973 add_hook(&assume_indexes_are_valid
, OP_HOOK
);