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"
36 struct string_list
*__ignored_macros
= NULL
;
37 static int in_warn_on_macro(void)
39 struct statement
*stmt
;
43 stmt
= get_current_statement();
46 macro
= get_macro_name(stmt
->pos
);
50 FOR_EACH_PTR(__ignored_macros
, tmp
) {
51 if (!strcmp(tmp
, macro
))
53 } END_FOR_EACH_PTR(tmp
);
57 typedef void (mod_hook
)(const char *name
, struct symbol
*sym
, struct smatch_state
*state
);
58 DECLARE_PTR_LIST(void_fn_list
, mod_hook
*);
59 static struct void_fn_list
*extra_mod_hooks
;
60 void add_extra_mod_hook(mod_hook
*fn
)
62 mod_hook
**p
= malloc(sizeof(mod_hook
*));
64 add_ptr_list(&extra_mod_hooks
, p
);
67 void call_extra_mod_hooks(const char *name
, struct symbol
*sym
, struct smatch_state
*state
)
71 FOR_EACH_PTR(extra_mod_hooks
, fn
) {
72 (*fn
)(name
, sym
, state
);
73 } END_FOR_EACH_PTR(fn
);
76 struct sm_state
*set_extra_mod_helper(const char *name
, struct symbol
*sym
, struct smatch_state
*state
)
78 remove_from_equiv(name
, sym
);
79 call_extra_mod_hooks(name
, sym
, state
);
80 if (__in_fake_assign
&& estate_is_unknown(state
) && !get_state(SMATCH_EXTRA
, name
, sym
))
82 return set_state(SMATCH_EXTRA
, name
, sym
, state
);
85 static char *get_other_name_sym(const char *name
, struct symbol
*sym
, struct symbol
**new_sym
)
87 struct expression
*assigned
;
88 char *orig_name
= NULL
;
98 skip
= strlen(sym
->ident
->name
);
99 if (name
[skip
] != '-' || name
[skip
+ 1] != '>')
103 assigned
= get_assigned_expr_name_sym(sym
->ident
->name
, sym
);
106 if (assigned
->type
== EXPR_PREOP
|| assigned
->op
== '&') {
108 orig_name
= expr_to_var_sym(assigned
, new_sym
);
109 if (!orig_name
|| !*new_sym
)
112 snprintf(buf
, sizeof(buf
), "%s.%s", orig_name
+ 1, name
+ skip
);
113 ret
= alloc_string(buf
);
114 free_string(orig_name
);
118 if (assigned
->type
!= EXPR_DEREF
)
121 orig_name
= expr_to_var_sym(assigned
, new_sym
);
122 if (!orig_name
|| !*new_sym
)
125 snprintf(buf
, sizeof(buf
), "%s->%s", orig_name
, name
+ skip
);
126 ret
= alloc_string(buf
);
127 free_string(orig_name
);
131 free_string(orig_name
);
135 struct sm_state
*set_extra_mod(const char *name
, struct symbol
*sym
, struct smatch_state
*state
)
138 struct symbol
*new_sym
;
141 if (in_warn_on_macro())
143 sm
= set_extra_mod_helper(name
, sym
, state
);
144 new_name
= get_other_name_sym(name
, sym
, &new_sym
);
145 if (new_name
&& new_sym
)
146 set_extra_mod_helper(new_name
, new_sym
, state
);
147 free_string(new_name
);
151 struct sm_state
*set_extra_expr_mod(struct expression
*expr
, struct smatch_state
*state
)
155 struct sm_state
*ret
= NULL
;
157 expr
= strip_expr(expr
);
158 name
= expr_to_var_sym(expr
, &sym
);
161 ret
= set_extra_mod(name
, sym
, state
);
167 void set_extra_nomod(const char *name
, struct symbol
*sym
, struct smatch_state
*state
)
170 struct symbol
*new_sym
;
171 struct relation
*rel
;
172 struct smatch_state
*orig_state
;
174 orig_state
= get_state(SMATCH_EXTRA
, name
, sym
);
176 new_name
= get_other_name_sym(name
, sym
, &new_sym
);
177 if (new_name
&& new_sym
)
178 set_state(SMATCH_EXTRA
, new_name
, new_sym
, state
);
179 free_string(new_name
);
181 if (!estate_related(orig_state
)) {
182 set_state(SMATCH_EXTRA
, name
, sym
, state
);
186 set_related(state
, estate_related(orig_state
));
187 FOR_EACH_PTR(estate_related(orig_state
), rel
) {
188 if (option_debug_related
)
189 sm_msg("%s updating related %s to %s", name
, rel
->name
, state
->name
);
190 set_state(SMATCH_EXTRA
, rel
->name
, rel
->sym
, state
);
191 } END_FOR_EACH_PTR(rel
);
195 * This is for return_implies_state() hooks which modify a SMATCH_EXTRA state
197 void set_extra_expr_nomod(struct expression
*expr
, struct smatch_state
*state
)
202 name
= expr_to_var_sym(expr
, &sym
);
205 set_extra_nomod(name
, sym
, state
);
211 static void set_extra_true_false(const char *name
, struct symbol
*sym
,
212 struct smatch_state
*true_state
,
213 struct smatch_state
*false_state
)
216 struct symbol
*new_sym
;
217 struct relation
*rel
;
218 struct smatch_state
*orig_state
;
220 if (in_warn_on_macro())
223 new_name
= get_other_name_sym(name
, sym
, &new_sym
);
224 if (new_name
&& new_sym
)
225 set_true_false_states(SMATCH_EXTRA
, new_name
, new_sym
, true_state
, false_state
);
226 free_string(new_name
);
228 orig_state
= get_state(SMATCH_EXTRA
, name
, sym
);
230 if (!estate_related(orig_state
)) {
231 set_true_false_states(SMATCH_EXTRA
, name
, sym
, true_state
, false_state
);
236 set_related(true_state
, estate_related(orig_state
));
238 set_related(false_state
, estate_related(orig_state
));
240 FOR_EACH_PTR(estate_related(orig_state
), rel
) {
241 set_true_false_states(SMATCH_EXTRA
, rel
->name
, rel
->sym
,
242 true_state
, false_state
);
243 } END_FOR_EACH_PTR(rel
);
246 static void set_extra_expr_true_false(struct expression
*expr
,
247 struct smatch_state
*true_state
,
248 struct smatch_state
*false_state
)
253 expr
= strip_expr(expr
);
254 name
= expr_to_var_sym(expr
, &sym
);
257 set_extra_true_false(name
, sym
, true_state
, false_state
);
262 static struct sm_state
*handle_canonical_while_count_down(struct statement
*loop
)
264 struct expression
*iter_var
;
265 struct expression
*condition
;
267 struct smatch_state
*estate
;
270 condition
= strip_expr(loop
->iterator_pre_condition
);
273 if (condition
->type
!= EXPR_PREOP
&& condition
->type
!= EXPR_POSTOP
)
275 if (condition
->op
!= SPECIAL_DECREMENT
)
278 iter_var
= condition
->unop
;
279 sm
= get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
282 if (sval_cmp_val(estate_min(sm
->state
), 0) < 0)
284 start
= estate_max(sm
->state
);
285 if (sval_cmp_val(start
, 0) <= 0)
287 if (!sval_is_max(start
))
290 if (condition
->type
== EXPR_PREOP
) {
291 estate
= alloc_estate_range(sval_type_val(start
.type
, 1), start
);
292 if (estate_has_hard_max(sm
->state
))
293 estate_set_hard_max(estate
);
294 estate_copy_fuzzy_max(estate
, sm
->state
);
295 set_extra_expr_mod(iter_var
, estate
);
297 if (condition
->type
== EXPR_POSTOP
) {
298 estate
= alloc_estate_range(sval_type_val(start
.type
, 0), start
);
299 if (estate_has_hard_max(sm
->state
))
300 estate_set_hard_max(estate
);
301 estate_copy_fuzzy_max(estate
, sm
->state
);
302 set_extra_expr_mod(iter_var
, estate
);
304 return get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
307 static struct sm_state
*handle_canonical_for_inc(struct expression
*iter_expr
,
308 struct expression
*condition
)
310 struct expression
*iter_var
;
312 struct smatch_state
*estate
;
313 sval_t start
, end
, max
;
315 iter_var
= iter_expr
->unop
;
316 sm
= get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
319 if (!estate_get_single_value(sm
->state
, &start
))
321 if (get_implied_max(condition
->right
, &end
))
322 end
= sval_cast(get_type(iter_var
), end
);
324 end
= sval_type_max(get_type(iter_var
));
326 if (get_sm_state_expr(SMATCH_EXTRA
, condition
->left
) != sm
)
329 switch (condition
->op
) {
330 case SPECIAL_UNSIGNED_LT
:
331 case SPECIAL_NOTEQUAL
:
333 if (!sval_is_min(end
))
336 case SPECIAL_UNSIGNED_LTE
:
342 if (sval_cmp(end
, start
) < 0)
344 estate
= alloc_estate_range(start
, end
);
345 if (get_hard_max(condition
->right
, &max
)) {
346 estate_set_hard_max(estate
);
347 if (condition
->op
== '<' ||
348 condition
->op
== SPECIAL_UNSIGNED_LT
||
349 condition
->op
== SPECIAL_NOTEQUAL
)
351 estate_set_fuzzy_max(estate
, max
);
353 set_extra_expr_mod(iter_var
, estate
);
354 return get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
357 static struct sm_state
*handle_canonical_for_dec(struct expression
*iter_expr
,
358 struct expression
*condition
)
360 struct expression
*iter_var
;
362 struct smatch_state
*estate
;
365 iter_var
= iter_expr
->unop
;
366 sm
= get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
369 if (!estate_get_single_value(sm
->state
, &start
))
371 if (!get_implied_min(condition
->right
, &end
))
372 end
= sval_type_min(get_type(iter_var
));
373 if (get_sm_state_expr(SMATCH_EXTRA
, condition
->left
) != sm
)
376 switch (condition
->op
) {
377 case SPECIAL_NOTEQUAL
:
379 if (!sval_is_min(end
) && !sval_is_max(end
))
387 if (sval_cmp(end
, start
) > 0)
389 estate
= alloc_estate_range(end
, start
);
390 estate_set_hard_max(estate
);
391 estate_set_fuzzy_max(estate
, estate_get_fuzzy_max(estate
));
392 set_extra_expr_mod(iter_var
, estate
);
393 return get_sm_state_expr(SMATCH_EXTRA
, iter_var
);
396 static struct sm_state
*handle_canonical_for_loops(struct statement
*loop
)
398 struct expression
*iter_expr
;
399 struct expression
*condition
;
401 if (!loop
->iterator_post_statement
)
403 if (loop
->iterator_post_statement
->type
!= STMT_EXPRESSION
)
405 iter_expr
= loop
->iterator_post_statement
->expression
;
406 if (!loop
->iterator_pre_condition
)
408 if (loop
->iterator_pre_condition
->type
!= EXPR_COMPARE
)
410 condition
= loop
->iterator_pre_condition
;
412 if (iter_expr
->op
== SPECIAL_INCREMENT
)
413 return handle_canonical_for_inc(iter_expr
, condition
);
414 if (iter_expr
->op
== SPECIAL_DECREMENT
)
415 return handle_canonical_for_dec(iter_expr
, condition
);
419 struct sm_state
*__extra_handle_canonical_loops(struct statement
*loop
, struct stree
**stree
)
421 struct sm_state
*ret
;
423 __push_fake_cur_stree();
424 if (!loop
->iterator_post_statement
)
425 ret
= handle_canonical_while_count_down(loop
);
427 ret
= handle_canonical_for_loops(loop
);
428 *stree
= __pop_fake_cur_stree();
432 int __iterator_unchanged(struct sm_state
*sm
)
436 if (get_sm_state(my_id
, sm
->name
, sm
->sym
) == sm
)
441 static void while_count_down_after(struct sm_state
*sm
, struct expression
*condition
)
445 /* paranoid checking. prolly not needed */
446 condition
= strip_expr(condition
);
449 if (condition
->type
!= EXPR_PREOP
&& condition
->type
!= EXPR_POSTOP
)
451 if (condition
->op
!= SPECIAL_DECREMENT
)
453 after_value
= estate_min(sm
->state
);
455 set_extra_mod(sm
->name
, sm
->sym
, alloc_estate_sval(after_value
));
458 void __extra_pre_loop_hook_after(struct sm_state
*sm
,
459 struct statement
*iterator
,
460 struct expression
*condition
)
462 struct expression
*iter_expr
;
464 struct smatch_state
*state
;
467 while_count_down_after(sm
, condition
);
471 iter_expr
= iterator
->expression
;
473 if (condition
->type
!= EXPR_COMPARE
)
475 if (iter_expr
->op
== SPECIAL_INCREMENT
) {
476 limit
= sval_binop(estate_max(sm
->state
), '+',
477 sval_type_val(estate_type(sm
->state
), 1));
479 limit
= sval_binop(estate_min(sm
->state
), '-',
480 sval_type_val(estate_type(sm
->state
), 1));
482 if (!estate_has_hard_max(sm
->state
) && !__has_breaks()) {
483 if (iter_expr
->op
== SPECIAL_INCREMENT
)
484 state
= alloc_estate_range(estate_min(sm
->state
), limit
);
486 state
= alloc_estate_range(limit
, estate_max(sm
->state
));
488 state
= alloc_estate_sval(limit
);
490 if (!estate_has_hard_max(sm
->state
)) {
491 estate_clear_hard_max(state
);
493 if (estate_has_fuzzy_max(sm
->state
)) {
494 sval_t hmax
= estate_get_fuzzy_max(sm
->state
);
495 sval_t max
= estate_max(sm
->state
);
497 if (sval_cmp(hmax
, max
) != 0)
498 estate_clear_fuzzy_max(state
);
499 } else if (!estate_has_fuzzy_max(sm
->state
)) {
500 estate_clear_fuzzy_max(state
);
503 set_extra_mod(sm
->name
, sm
->sym
, state
);
506 static struct stree
*unmatched_stree
;
507 static struct smatch_state
*unmatched_state(struct sm_state
*sm
)
509 struct smatch_state
*state
;
511 if (unmatched_stree
) {
512 state
= get_state_stree(unmatched_stree
, SMATCH_EXTRA
, sm
->name
, sm
->sym
);
516 if (parent_is_gone_var_sym(sm
->name
, sm
->sym
))
517 return alloc_estate_empty();
518 return alloc_estate_whole(estate_type(sm
->state
));
521 static void clear_the_pointed_at(struct expression
*expr
)
526 struct sm_state
*tmp
;
528 name
= expr_to_var_sym(expr
, &sym
);
532 stree
= __get_cur_stree();
533 FOR_EACH_MY_SM(SMATCH_EXTRA
, stree
, tmp
) {
534 if (tmp
->name
[0] != '*')
538 if (strcmp(tmp
->name
+ 1, name
) != 0)
540 set_extra_mod(tmp
->name
, tmp
->sym
, alloc_estate_whole(estate_type(tmp
->state
)));
541 } END_FOR_EACH_SM(tmp
);
547 static void match_function_call(struct expression
*expr
)
549 struct expression
*arg
;
550 struct expression
*tmp
;
552 /* if we have the db this is handled in smatch_function_hooks.c */
555 if (inlinable(expr
->fn
))
558 FOR_EACH_PTR(expr
->args
, arg
) {
559 tmp
= strip_expr(arg
);
560 if (tmp
->type
== EXPR_PREOP
&& tmp
->op
== '&')
561 set_extra_expr_mod(tmp
->unop
, alloc_estate_whole(get_type(tmp
->unop
)));
563 clear_the_pointed_at(tmp
);
564 } END_FOR_EACH_PTR(arg
);
567 static int types_equiv_or_pointer(struct symbol
*one
, struct symbol
*two
)
571 if (one
->type
== SYM_PTR
&& two
->type
== SYM_PTR
)
573 return types_equiv(one
, two
);
576 static bool is_non_null_array(struct expression
*expr
)
584 type
= get_type(expr
);
585 if (!type
|| type
->type
!= SYM_ARRAY
)
587 if (expr
->type
== EXPR_SYMBOL
)
589 if (implied_not_equal(expr
, 0))
592 /* verify that it's not the first member of the struct */
593 if (expr
->type
!= EXPR_DEREF
|| !expr
->member
)
595 name
= expr_to_var_sym(expr
, &sym
);
599 type
= get_real_base_type(sym
);
600 if (!type
|| type
->type
!= SYM_PTR
)
602 type
= get_real_base_type(type
);
603 if (type
->type
!= SYM_STRUCT
)
607 FOR_EACH_PTR(type
->symbol_list
, tmp
) {
611 if (strcmp(expr
->member
->name
, tmp
->ident
->name
) == 0) {
616 } END_FOR_EACH_PTR(tmp
);
621 static void match_vanilla_assign(struct expression
*left
, struct expression
*right
)
623 struct range_list
*rl
= NULL
;
624 struct symbol
*right_sym
;
625 struct symbol
*left_type
;
626 struct symbol
*right_type
;
627 char *right_name
= NULL
;
631 struct smatch_state
*state
;
636 name
= expr_to_var_sym(left
, &sym
);
640 left_type
= get_type(left
);
641 right_type
= get_type(right
);
643 right_name
= expr_to_var_sym(right
, &right_sym
);
645 if (!__in_fake_assign
&&
646 !(right
->type
== EXPR_PREOP
&& right
->op
== '&') &&
647 right_name
&& right_sym
&&
648 types_equiv_or_pointer(left_type
, right_type
) &&
649 !has_symbol(right
, sym
)) {
650 set_equiv(left
, right
);
654 if (is_non_null_array(right
)) {
655 state
= alloc_estate_range(array_min_sval
, array_max_sval
);
656 } else if (get_implied_rl(right
, &rl
)) {
657 rl
= cast_rl(left_type
, rl
);
658 state
= alloc_estate_rl(rl
);
659 if (get_hard_max(right
, &max
)) {
660 estate_set_hard_max(state
);
661 estate_set_fuzzy_max(state
, max
);
664 rl
= alloc_whole_rl(right_type
);
665 rl
= cast_rl(left_type
, rl
);
666 state
= alloc_estate_rl(rl
);
668 set_extra_mod(name
, sym
, state
);
670 free_string(right_name
);
673 static int op_remove_assign(int op
)
676 case SPECIAL_ADD_ASSIGN
:
678 case SPECIAL_SUB_ASSIGN
:
680 case SPECIAL_MUL_ASSIGN
:
682 case SPECIAL_DIV_ASSIGN
:
684 case SPECIAL_MOD_ASSIGN
:
686 case SPECIAL_AND_ASSIGN
:
688 case SPECIAL_OR_ASSIGN
:
690 case SPECIAL_XOR_ASSIGN
:
692 case SPECIAL_SHL_ASSIGN
:
693 return SPECIAL_LEFTSHIFT
;
694 case SPECIAL_SHR_ASSIGN
:
695 return SPECIAL_RIGHTSHIFT
;
701 static void match_assign(struct expression
*expr
)
703 struct range_list
*rl
= NULL
;
704 struct expression
*left
;
705 struct expression
*right
;
706 struct expression
*binop_expr
;
707 struct symbol
*left_type
;
708 struct symbol
*right_type
;
711 sval_t left_min
, left_max
;
712 sval_t right_min
, right_max
;
713 sval_t res_min
, res_max
;
715 left
= strip_expr(expr
->left
);
717 right
= strip_expr(expr
->right
);
718 while (right
->type
== EXPR_ASSIGNMENT
&& right
->op
== '=')
719 right
= strip_expr(right
->left
);
721 if (expr
->op
== '=' && is_condition(expr
->right
))
722 return; /* handled in smatch_condition.c */
723 if (expr
->op
== '=' && right
->type
== EXPR_CALL
)
724 return; /* handled in smatch_function_hooks.c */
725 if (expr
->op
== '=') {
726 match_vanilla_assign(left
, right
);
730 name
= expr_to_var_sym(left
, &sym
);
734 left_type
= get_type(left
);
735 right_type
= get_type(right
);
737 res_min
= sval_type_min(left_type
);
738 res_max
= sval_type_max(left_type
);
741 case SPECIAL_ADD_ASSIGN
:
742 get_absolute_max(left
, &left_max
);
743 get_absolute_max(right
, &right_max
);
744 if (sval_binop_overflows(left_max
, '+', right_max
))
746 if (get_implied_min(left
, &left_min
) &&
747 !sval_is_negative_min(left_min
) &&
748 get_implied_min(right
, &right_min
) &&
749 !sval_is_negative_min(right_min
)) {
750 res_min
= sval_binop(left_min
, '+', right_min
);
751 res_min
= sval_cast(right_type
, res_min
);
753 if (inside_loop()) /* we are assuming loops don't lead to wrapping */
755 res_max
= sval_binop(left_max
, '+', right_max
);
756 res_max
= sval_cast(right_type
, res_max
);
758 case SPECIAL_SUB_ASSIGN
:
759 if (get_implied_max(left
, &left_max
) &&
760 !sval_is_max(left_max
) &&
761 get_implied_min(right
, &right_min
) &&
762 !sval_is_min(right_min
)) {
763 res_max
= sval_binop(left_max
, '-', right_min
);
764 res_max
= sval_cast(right_type
, res_max
);
768 if (get_implied_min(left
, &left_min
) &&
769 !sval_is_min(left_min
) &&
770 get_implied_max(right
, &right_max
) &&
771 !sval_is_max(right_max
)) {
772 res_min
= sval_binop(left_min
, '-', right_max
);
773 res_min
= sval_cast(right_type
, res_min
);
776 case SPECIAL_AND_ASSIGN
:
777 case SPECIAL_MOD_ASSIGN
:
778 case SPECIAL_SHL_ASSIGN
:
779 case SPECIAL_SHR_ASSIGN
:
780 case SPECIAL_OR_ASSIGN
:
781 case SPECIAL_XOR_ASSIGN
:
782 case SPECIAL_MUL_ASSIGN
:
783 case SPECIAL_DIV_ASSIGN
:
784 binop_expr
= binop_expression(expr
->left
,
785 op_remove_assign(expr
->op
),
787 if (get_absolute_rl(binop_expr
, &rl
)) {
788 rl
= cast_rl(left_type
, rl
);
789 set_extra_mod(name
, sym
, alloc_estate_rl(rl
));
794 rl
= cast_rl(left_type
, alloc_rl(res_min
, res_max
));
795 set_extra_mod(name
, sym
, alloc_estate_rl(rl
));
800 static struct smatch_state
*increment_state(struct smatch_state
*state
)
802 sval_t min
= estate_min(state
);
803 sval_t max
= estate_max(state
);
805 if (!estate_rl(state
))
809 max
= sval_type_max(max
.type
);
811 if (!sval_is_min(min
) && !sval_is_max(min
))
813 if (!sval_is_min(max
) && !sval_is_max(max
))
815 return alloc_estate_range(min
, max
);
818 static struct smatch_state
*decrement_state(struct smatch_state
*state
)
820 sval_t min
= estate_min(state
);
821 sval_t max
= estate_max(state
);
823 if (!estate_rl(state
))
827 min
= sval_type_min(min
.type
);
829 if (!sval_is_min(min
) && !sval_is_max(min
))
831 if (!sval_is_min(max
) && !sval_is_max(max
))
833 return alloc_estate_range(min
, max
);
836 static void unop_expr(struct expression
*expr
)
838 struct smatch_state
*state
;
840 if (expr
->smatch_flags
& Handled
)
844 case SPECIAL_INCREMENT
:
845 state
= get_state_expr(SMATCH_EXTRA
, expr
->unop
);
846 state
= increment_state(state
);
848 state
= alloc_estate_whole(get_type(expr
));
849 set_extra_expr_mod(expr
->unop
, state
);
851 case SPECIAL_DECREMENT
:
852 state
= get_state_expr(SMATCH_EXTRA
, expr
->unop
);
853 state
= decrement_state(state
);
855 state
= alloc_estate_whole(get_type(expr
));
856 set_extra_expr_mod(expr
->unop
, state
);
863 static void asm_expr(struct statement
*stmt
)
866 struct expression
*expr
;
870 FOR_EACH_PTR(stmt
->asm_outputs
, expr
) {
872 case 0: /* identifier */
873 case 1: /* constraint */
876 case 2: /* expression */
878 type
= get_type(strip_expr(expr
));
879 set_extra_expr_mod(expr
, alloc_estate_whole(type
));
882 } END_FOR_EACH_PTR(expr
);
885 static void delete_state_tracker(struct tracker
*t
)
887 remove_from_equiv(t
->name
, t
->sym
);
888 delete_state(t
->owner
, t
->name
, t
->sym
);
891 static void scoped_state_extra(const char *name
, struct symbol
*sym
)
895 t
= alloc_tracker(SMATCH_EXTRA
, name
, sym
);
896 add_scope_hook((scope_hook
*)&delete_state_tracker
, t
);
899 static void check_dereference(struct expression
*expr
)
901 if (outside_of_function())
903 set_extra_expr_nomod(expr
, alloc_estate_range(valid_ptr_min_sval
, valid_ptr_max_sval
));
906 static void match_dereferences(struct expression
*expr
)
908 if (expr
->type
!= EXPR_PREOP
)
910 check_dereference(expr
->unop
);
913 static void match_pointer_as_array(struct expression
*expr
)
917 check_dereference(get_array_base(expr
));
920 static void set_param_dereferenced(struct expression
*arg
, char *key
, char *unused
)
925 name
= get_variable_from_key(arg
, key
, &sym
);
929 set_extra_nomod(name
, sym
, alloc_estate_range(valid_ptr_min_sval
, valid_ptr_max_sval
));
935 static sval_t
add_one(sval_t sval
)
941 static sval_t
sub_one(sval_t sval
)
947 static void handle_comparison(struct symbol
*type
, struct expression
*left
, int op
, struct expression
*right
)
949 struct range_list
*left_orig
;
950 struct range_list
*left_true
;
951 struct range_list
*left_false
;
952 struct range_list
*right_orig
;
953 struct range_list
*right_true
;
954 struct range_list
*right_false
;
955 struct smatch_state
*left_true_state
;
956 struct smatch_state
*left_false_state
;
957 struct smatch_state
*right_true_state
;
958 struct smatch_state
*right_false_state
;
959 sval_t min
, max
, dummy
, hard_max
;
961 int right_postop
= 0;
963 if (left
->op
== SPECIAL_INCREMENT
|| left
->op
== SPECIAL_DECREMENT
) {
964 if (left
->type
== EXPR_POSTOP
) {
965 left
->smatch_flags
|= Handled
;
966 left_postop
= left
->op
;
968 left
= strip_expr(left
->unop
);
970 while (left
->type
== EXPR_ASSIGNMENT
)
971 left
= strip_expr(left
->left
);
973 if (right
->op
== SPECIAL_INCREMENT
|| right
->op
== SPECIAL_DECREMENT
) {
974 if (right
->type
== EXPR_POSTOP
) {
975 right
->smatch_flags
|= Handled
;
976 right_postop
= right
->op
;
978 right
= strip_expr(right
->unop
);
981 if (get_implied_rl(left
, &left_orig
)) {
982 left_orig
= cast_rl(type
, left_orig
);
984 min
= sval_type_min(get_type(left
));
985 max
= sval_type_max(get_type(left
));
986 left_orig
= cast_rl(type
, alloc_rl(min
, max
));
989 if (get_implied_rl(right
, &right_orig
)) {
990 right_orig
= cast_rl(type
, right_orig
);
992 min
= sval_type_min(get_type(right
));
993 max
= sval_type_max(get_type(right
));
994 right_orig
= cast_rl(type
, alloc_rl(min
, max
));
996 min
= sval_type_min(type
);
997 max
= sval_type_max(type
);
999 left_true
= clone_rl(left_orig
);
1000 left_false
= clone_rl(left_orig
);
1001 right_true
= clone_rl(right_orig
);
1002 right_false
= clone_rl(right_orig
);
1006 case SPECIAL_UNSIGNED_LT
:
1007 left_true
= remove_range(left_orig
, rl_max(right_orig
), max
);
1008 if (!sval_is_min(rl_min(right_orig
))) {
1009 left_false
= remove_range(left_orig
, min
, sub_one(rl_min(right_orig
)));
1012 right_true
= remove_range(right_orig
, min
, rl_min(left_orig
));
1013 if (!sval_is_max(rl_max(left_orig
)))
1014 right_false
= remove_range(right_orig
, add_one(rl_max(left_orig
)), max
);
1016 case SPECIAL_UNSIGNED_LTE
:
1018 if (!sval_is_max(rl_max(right_orig
)))
1019 left_true
= remove_range(left_orig
, add_one(rl_max(right_orig
)), max
);
1020 left_false
= remove_range(left_orig
, min
, rl_min(right_orig
));
1022 if (!sval_is_min(rl_min(left_orig
)))
1023 right_true
= remove_range(right_orig
, min
, sub_one(rl_min(left_orig
)));
1024 right_false
= remove_range(right_orig
, rl_max(left_orig
), max
);
1026 if (sval_cmp(rl_min(left_orig
), rl_min(right_orig
)) == 0)
1027 left_false
= remove_range(left_false
, rl_min(left_orig
), rl_min(left_orig
));
1028 if (sval_cmp(rl_max(left_orig
), rl_max(right_orig
)) == 0)
1029 right_false
= remove_range(right_false
, rl_max(left_orig
), rl_max(left_orig
));
1032 if (!sval_is_max(rl_max(right_orig
))) {
1033 left_true
= remove_range(left_true
, add_one(rl_max(right_orig
)), max
);
1035 if (!sval_is_min(rl_min(right_orig
))) {
1036 left_true
= remove_range(left_true
, min
, sub_one(rl_min(right_orig
)));
1038 if (sval_cmp(rl_min(right_orig
), rl_max(right_orig
)) == 0)
1039 left_false
= remove_range(left_orig
, rl_min(right_orig
), rl_min(right_orig
));
1041 if (!sval_is_max(rl_max(left_orig
)))
1042 right_true
= remove_range(right_true
, add_one(rl_max(left_orig
)), max
);
1043 if (!sval_is_min(rl_min(left_orig
)))
1044 right_true
= remove_range(right_true
, min
, sub_one(rl_min(left_orig
)));
1045 if (sval_cmp(rl_min(left_orig
), rl_max(left_orig
)) == 0)
1046 right_false
= remove_range(right_orig
, rl_min(left_orig
), rl_min(left_orig
));
1048 case SPECIAL_UNSIGNED_GTE
:
1050 if (!sval_is_min(rl_min(right_orig
)))
1051 left_true
= remove_range(left_orig
, min
, sub_one(rl_min(right_orig
)));
1052 left_false
= remove_range(left_orig
, rl_max(right_orig
), max
);
1054 if (!sval_is_max(rl_max(left_orig
)))
1055 right_true
= remove_range(right_orig
, add_one(rl_max(left_orig
)), max
);
1056 right_false
= remove_range(right_orig
, min
, rl_min(left_orig
));
1058 if (sval_cmp(rl_min(left_orig
), rl_min(right_orig
)) == 0)
1059 right_false
= remove_range(right_false
, rl_min(left_orig
), rl_min(left_orig
));
1060 if (sval_cmp(rl_max(left_orig
), rl_max(right_orig
)) == 0)
1061 left_false
= remove_range(left_false
, rl_max(left_orig
), rl_max(left_orig
));
1064 case SPECIAL_UNSIGNED_GT
:
1065 left_true
= remove_range(left_orig
, min
, rl_min(right_orig
));
1066 if (!sval_is_max(rl_max(right_orig
)))
1067 left_false
= remove_range(left_orig
, add_one(rl_max(right_orig
)), max
);
1069 right_true
= remove_range(right_orig
, rl_max(left_orig
), max
);
1070 if (!sval_is_min(rl_min(left_orig
)))
1071 right_false
= remove_range(right_orig
, min
, sub_one(rl_min(left_orig
)));
1073 case SPECIAL_NOTEQUAL
:
1074 if (!sval_is_max(rl_max(right_orig
)))
1075 left_false
= remove_range(left_false
, add_one(rl_max(right_orig
)), max
);
1076 if (!sval_is_min(rl_min(right_orig
)))
1077 left_false
= remove_range(left_false
, min
, sub_one(rl_min(right_orig
)));
1078 if (sval_cmp(rl_min(right_orig
), rl_max(right_orig
)) == 0)
1079 left_true
= remove_range(left_orig
, rl_min(right_orig
), rl_min(right_orig
));
1081 if (!sval_is_max(rl_max(left_orig
)))
1082 right_false
= remove_range(right_false
, add_one(rl_max(left_orig
)), max
);
1083 if (!sval_is_min(rl_min(left_orig
)))
1084 right_false
= remove_range(right_false
, min
, sub_one(rl_min(left_orig
)));
1085 if (sval_cmp(rl_min(left_orig
), rl_max(left_orig
)) == 0)
1086 right_true
= remove_range(right_orig
, rl_min(left_orig
), rl_min(left_orig
));
1092 left_true
= rl_truncate_cast(get_type(left
), left_true
);
1093 left_false
= rl_truncate_cast(get_type(left
), left_false
);
1094 right_true
= rl_truncate_cast(get_type(right
), right_true
);
1095 right_false
= rl_truncate_cast(get_type(right
), right_false
);
1097 left_true_state
= alloc_estate_rl(left_true
);
1098 left_false_state
= alloc_estate_rl(left_false
);
1099 right_true_state
= alloc_estate_rl(right_true
);
1100 right_false_state
= alloc_estate_rl(right_false
);
1104 case SPECIAL_UNSIGNED_LT
:
1105 case SPECIAL_UNSIGNED_LTE
:
1107 if (get_hard_max(right
, &dummy
))
1108 estate_set_hard_max(left_true_state
);
1109 if (get_hard_max(left
, &dummy
))
1110 estate_set_hard_max(right_false_state
);
1113 case SPECIAL_UNSIGNED_GT
:
1114 case SPECIAL_UNSIGNED_GTE
:
1116 if (get_hard_max(left
, &dummy
))
1117 estate_set_hard_max(right_true_state
);
1118 if (get_hard_max(right
, &dummy
))
1119 estate_set_hard_max(left_false_state
);
1125 case SPECIAL_UNSIGNED_LT
:
1126 case SPECIAL_UNSIGNED_LTE
:
1128 if (get_hard_max(right
, &hard_max
)) {
1129 if (op
== '<' || op
== SPECIAL_UNSIGNED_LT
)
1131 estate_set_fuzzy_max(left_true_state
, hard_max
);
1133 if (get_implied_value(right
, &hard_max
)) {
1134 if (op
== SPECIAL_UNSIGNED_LTE
||
1137 estate_set_fuzzy_max(left_false_state
, hard_max
);
1139 if (get_hard_max(left
, &hard_max
)) {
1140 if (op
== SPECIAL_UNSIGNED_LTE
||
1143 estate_set_fuzzy_max(right_false_state
, hard_max
);
1145 if (get_implied_value(left
, &hard_max
)) {
1146 if (op
== '<' || op
== SPECIAL_UNSIGNED_LT
)
1148 estate_set_fuzzy_max(right_true_state
, hard_max
);
1152 case SPECIAL_UNSIGNED_GT
:
1153 case SPECIAL_UNSIGNED_GTE
:
1155 if (get_hard_max(left
, &hard_max
)) {
1156 if (op
== '>' || op
== SPECIAL_UNSIGNED_GT
)
1158 estate_set_fuzzy_max(right_true_state
, hard_max
);
1160 if (get_implied_value(left
, &hard_max
)) {
1161 if (op
== SPECIAL_UNSIGNED_GTE
||
1164 estate_set_fuzzy_max(right_false_state
, hard_max
);
1166 if (get_hard_max(right
, &hard_max
)) {
1167 if (op
== SPECIAL_UNSIGNED_LTE
||
1170 estate_set_fuzzy_max(left_false_state
, hard_max
);
1172 if (get_implied_value(right
, &hard_max
)) {
1174 op
== SPECIAL_UNSIGNED_GT
)
1176 estate_set_fuzzy_max(left_true_state
, hard_max
);
1180 if (get_hard_max(left
, &hard_max
))
1181 estate_set_fuzzy_max(right_true_state
, hard_max
);
1182 if (get_hard_max(right
, &hard_max
))
1183 estate_set_fuzzy_max(left_true_state
, hard_max
);
1187 if (get_hard_max(left
, &hard_max
)) {
1188 estate_set_hard_max(left_true_state
);
1189 estate_set_hard_max(left_false_state
);
1191 if (get_hard_max(right
, &hard_max
)) {
1192 estate_set_hard_max(right_true_state
);
1193 estate_set_hard_max(right_false_state
);
1196 if (left_postop
== SPECIAL_INCREMENT
) {
1197 left_true_state
= increment_state(left_true_state
);
1198 left_false_state
= increment_state(left_false_state
);
1200 if (left_postop
== SPECIAL_DECREMENT
) {
1201 left_true_state
= decrement_state(left_true_state
);
1202 left_false_state
= decrement_state(left_false_state
);
1204 if (right_postop
== SPECIAL_INCREMENT
) {
1205 right_true_state
= increment_state(right_true_state
);
1206 right_false_state
= increment_state(right_false_state
);
1208 if (right_postop
== SPECIAL_DECREMENT
) {
1209 right_true_state
= decrement_state(right_true_state
);
1210 right_false_state
= decrement_state(right_false_state
);
1213 if (estate_rl(left_true_state
) && estates_equiv(left_true_state
, left_false_state
)) {
1214 left_true_state
= NULL
;
1215 left_false_state
= NULL
;
1218 if (estate_rl(right_true_state
) && estates_equiv(right_true_state
, right_false_state
)) {
1219 right_true_state
= NULL
;
1220 right_false_state
= NULL
;
1223 set_extra_expr_true_false(left
, left_true_state
, left_false_state
);
1224 set_extra_expr_true_false(right
, right_true_state
, right_false_state
);
1227 static int is_simple_math(struct expression
*expr
)
1231 if (expr
->type
!= EXPR_BINOP
)
1242 static void move_known_values(struct expression
**left_p
, struct expression
**right_p
)
1244 struct expression
*left
= *left_p
;
1245 struct expression
*right
= *right_p
;
1248 if (get_implied_value(left
, &sval
)) {
1249 if (!is_simple_math(right
))
1251 if (right
->op
== '*') {
1254 if (!get_value(right
->right
, &divisor
))
1256 if (divisor
.value
== 0 && sval
.value
% divisor
.value
)
1258 *left_p
= binop_expression(left
, invert_op(right
->op
), right
->right
);
1259 *right_p
= right
->left
;
1262 if (right
->op
== '+' && get_value(right
->left
, &sval
)) {
1263 *left_p
= binop_expression(left
, invert_op(right
->op
), right
->left
);
1264 *right_p
= right
->right
;
1267 if (get_value(right
->right
, &sval
)) {
1268 *left_p
= binop_expression(left
, invert_op(right
->op
), right
->right
);
1269 *right_p
= right
->left
;
1274 if (get_implied_value(right
, &sval
)) {
1275 if (!is_simple_math(left
))
1277 if (left
->op
== '*') {
1280 if (!get_value(left
->right
, &divisor
))
1282 if (divisor
.value
== 0 && sval
.value
% divisor
.value
)
1284 *right_p
= binop_expression(right
, invert_op(left
->op
), left
->right
);
1285 *left_p
= left
->left
;
1288 if (left
->op
== '+' && get_value(left
->left
, &sval
)) {
1289 *right_p
= binop_expression(right
, invert_op(left
->op
), left
->left
);
1290 *left_p
= left
->right
;
1294 if (get_value(left
->right
, &sval
)) {
1295 *right_p
= binop_expression(right
, invert_op(left
->op
), left
->right
);
1296 *left_p
= left
->left
;
1303 static int match_func_comparison(struct expression
*expr
)
1305 struct expression
*left
= strip_expr(expr
->left
);
1306 struct expression
*right
= strip_expr(expr
->right
);
1310 * fixme: think about this harder. We should always be trying to limit
1311 * the non-call side as well. If we can't determine the limitter does
1312 * that mean we aren't querying the database and are missing important
1316 if (left
->type
== EXPR_CALL
) {
1317 if (get_implied_value(left
, &sval
)) {
1318 handle_comparison(get_type(expr
), left
, expr
->op
, right
);
1321 function_comparison(left
, expr
->op
, right
);
1325 if (right
->type
== EXPR_CALL
) {
1326 if (get_implied_value(right
, &sval
)) {
1327 handle_comparison(get_type(expr
), left
, expr
->op
, right
);
1330 function_comparison(left
, expr
->op
, right
);
1337 static void match_comparison(struct expression
*expr
)
1339 struct expression
*left_orig
= strip_expr(expr
->left
);
1340 struct expression
*right_orig
= strip_expr(expr
->right
);
1341 struct expression
*left
, *right
;
1342 struct expression
*prev
;
1343 struct symbol
*type
;
1345 if (match_func_comparison(expr
))
1348 type
= get_type(expr
);
1350 type
= &llong_ctype
;
1354 move_known_values(&left
, &right
);
1355 handle_comparison(type
, left
, expr
->op
, right
);
1357 prev
= get_assigned_expr(left_orig
);
1358 if (is_simple_math(prev
) && has_variable(prev
, left_orig
) == 0) {
1361 move_known_values(&left
, &right
);
1362 handle_comparison(type
, left
, expr
->op
, right
);
1365 prev
= get_assigned_expr(right_orig
);
1366 if (is_simple_math(prev
) && has_variable(prev
, right_orig
) == 0) {
1369 move_known_values(&left
, &right
);
1370 handle_comparison(type
, left
, expr
->op
, right
);
1374 static void handle_AND_condition(struct expression
*expr
)
1376 struct range_list
*rl
= NULL
;
1379 if (get_implied_value(expr
->left
, &known
) && known
.value
> 0) {
1381 get_absolute_rl(expr
->right
, &rl
);
1382 rl
= remove_range(rl
, sval_type_val(known
.type
, 0), known
);
1383 set_extra_expr_true_false(expr
->right
, alloc_estate_rl(rl
), NULL
);
1387 if (get_implied_value(expr
->right
, &known
) && known
.value
> 0) {
1389 get_absolute_rl(expr
->left
, &rl
);
1390 rl
= remove_range(rl
, sval_type_val(known
.type
, 0), known
);
1391 set_extra_expr_true_false(expr
->left
, alloc_estate_rl(rl
), NULL
);
1396 /* this is actually hooked from smatch_implied.c... it's hacky, yes */
1397 void __extra_match_condition(struct expression
*expr
)
1401 struct smatch_state
*pre_state
;
1402 struct smatch_state
*true_state
;
1403 struct smatch_state
*false_state
;
1405 expr
= strip_expr(expr
);
1406 switch (expr
->type
) {
1408 function_comparison(expr
, SPECIAL_NOTEQUAL
, zero_expr());
1415 zero
= sval_blank(expr
);
1418 name
= expr_to_var_sym(expr
, &sym
);
1421 pre_state
= get_state(my_id
, name
, sym
);
1422 true_state
= estate_filter_sval(pre_state
, zero
);
1423 if (possibly_true(expr
, SPECIAL_EQUAL
, zero_expr()))
1424 false_state
= alloc_estate_sval(zero
);
1426 false_state
= alloc_estate_empty();
1427 set_extra_true_false(name
, sym
, true_state
, false_state
);
1432 match_comparison(expr
);
1434 case EXPR_ASSIGNMENT
:
1435 __extra_match_condition(expr
->left
);
1438 if (expr
->op
== '&')
1439 handle_AND_condition(expr
);
1444 static void assume_indexes_are_valid(struct expression
*expr
)
1446 struct expression
*array_expr
;
1448 struct expression
*offset
;
1449 struct symbol
*offset_type
;
1450 struct range_list
*rl_before
;
1451 struct range_list
*rl_after
;
1452 struct range_list
*filter
= NULL
;
1455 expr
= strip_expr(expr
);
1456 if (!is_array(expr
))
1459 offset
= get_array_offset(expr
);
1460 offset_type
= get_type(offset
);
1461 if (offset_type
&& type_signed(offset_type
)) {
1462 filter
= alloc_rl(sval_type_min(offset_type
),
1463 sval_type_val(offset_type
, -1));
1466 array_expr
= get_array_base(expr
);
1467 array_size
= get_real_array_size(array_expr
);
1468 if (array_size
> 1) {
1469 size
= sval_type_val(offset_type
, array_size
);
1470 add_range(&filter
, size
, sval_type_max(offset_type
));
1475 get_absolute_rl(offset
, &rl_before
);
1476 rl_after
= rl_filter(rl_before
, filter
);
1477 if (rl_equiv(rl_before
, rl_after
))
1479 set_extra_expr_nomod(offset
, alloc_estate_rl(rl_after
));
1482 /* returns 1 if it is not possible for expr to be value, otherwise returns 0 */
1483 int implied_not_equal(struct expression
*expr
, long long val
)
1485 return !possibly_false(expr
, SPECIAL_NOTEQUAL
, value_expr(val
));
1488 int implied_not_equal_name_sym(char *name
, struct symbol
*sym
, long long val
)
1490 struct smatch_state
*estate
;
1492 estate
= get_state(SMATCH_EXTRA
, name
, sym
);
1495 if (!rl_has_sval(estate_rl(estate
), sval_type_val(estate_type(estate
), 0)))
1500 int parent_is_null_var_sym(const char *name
, struct symbol
*sym
)
1505 struct smatch_state
*state
;
1507 strncpy(buf
, name
, sizeof(buf
) - 1);
1508 buf
[sizeof(buf
) - 1] = '\0';
1511 while (*start
== '*') {
1513 state
= get_state(SMATCH_EXTRA
, start
, sym
);
1516 if (!estate_rl(state
))
1518 if (estate_min(state
).value
== 0 &&
1519 estate_max(state
).value
== 0)
1524 while (*start
== '&')
1527 while ((end
= strrchr(start
, '-'))) {
1529 state
= get_state(SMATCH_EXTRA
, start
, sym
);
1532 if (estate_min(state
).value
== 0 &&
1533 estate_max(state
).value
== 0)
1539 int parent_is_null(struct expression
*expr
)
1545 expr
= strip_expr(expr
);
1546 var
= expr_to_var_sym(expr
, &sym
);
1549 ret
= parent_is_null_var_sym(var
, sym
);
1555 static int param_used_callback(void *found
, int argc
, char **argv
, char **azColName
)
1561 static int filter_unused_kzalloc_info(struct expression
*call
, int param
, char *printed_name
, struct sm_state
*sm
)
1566 /* for function pointers assume everything is used */
1567 if (call
->fn
->type
!= EXPR_SYMBOL
)
1571 * kzalloc() information is treated as special because so there is just
1572 * a lot of stuff initialized to zero and it makes building the database
1573 * take hours and hours.
1575 * In theory, we should just remove this line and not pass any unused
1576 * information, but I'm not sure enough that this code works so I want
1577 * to hold off on that for now.
1579 if (!estate_get_single_value(sm
->state
, &sval
) || sval
.value
!= 0)
1582 run_sql(¶m_used_callback
, &found
,
1583 "select * from call_implies where %s and type = %d and parameter = %d and key = '%s';",
1584 get_static_filter(call
->fn
->symbol
), PARAM_USED
, param
, printed_name
);
1588 /* If the database is not built yet, then assume everything is used */
1589 run_sql(¶m_used_callback
, &found
,
1590 "select * from call_implies where %s and type = %d;",
1591 get_static_filter(call
->fn
->symbol
), PARAM_USED
);
1598 static void struct_member_callback(struct expression
*call
, int param
, char *printed_name
, struct sm_state
*sm
)
1600 if (estate_is_whole(sm
->state
))
1602 if (filter_unused_kzalloc_info(call
, param
, printed_name
, sm
))
1604 sql_insert_caller_info(call
, PARAM_VALUE
, param
, printed_name
, sm
->state
->name
);
1605 if (estate_has_fuzzy_max(sm
->state
))
1606 sql_insert_caller_info(call
, FUZZY_MAX
, param
, printed_name
,
1607 sval_to_str(estate_get_fuzzy_max(sm
->state
)));
1610 static void db_limited_before(void)
1612 unmatched_stree
= clone_stree(__get_cur_stree());
1615 static void db_limited_after(void)
1617 free_stree(&unmatched_stree
);
1620 static void db_param_limit_filter(struct expression
*expr
, int param
, char *key
, char *value
, enum info_type op
)
1622 struct expression
*arg
;
1625 struct sm_state
*sm
;
1626 struct symbol
*compare_type
, *var_type
;
1627 struct range_list
*rl
;
1628 struct range_list
*limit
;
1629 struct range_list
*new;
1631 while (expr
->type
== EXPR_ASSIGNMENT
)
1632 expr
= strip_expr(expr
->right
);
1633 if (expr
->type
!= EXPR_CALL
)
1636 arg
= get_argument_from_call_expr(expr
->args
, param
);
1640 name
= get_variable_from_key(arg
, key
, &sym
);
1644 if (strcmp(key
, "$") == 0)
1645 compare_type
= get_arg_type(expr
->fn
, param
);
1647 compare_type
= get_member_type_from_key(arg
, key
);
1649 sm
= get_sm_state(SMATCH_EXTRA
, name
, sym
);
1651 rl
= estate_rl(sm
->state
);
1653 rl
= alloc_whole_rl(compare_type
);
1655 call_results_to_rl(expr
, compare_type
, value
, &limit
);
1656 new = rl_intersection(rl
, limit
);
1658 var_type
= get_member_type_from_key(arg
, key
);
1659 new = cast_rl(var_type
, new);
1661 /* We want to preserve the implications here */
1662 if (sm
&& rl_equiv(estate_rl(sm
->state
), new))
1665 if (op
== PARAM_LIMIT
)
1666 set_extra_nomod(name
, sym
, alloc_estate_rl(new));
1668 set_extra_mod(name
, sym
, alloc_estate_rl(new));
1675 static void db_param_limit(struct expression
*expr
, int param
, char *key
, char *value
)
1677 db_param_limit_filter(expr
, param
, key
, value
, PARAM_LIMIT
);
1680 static void db_param_filter(struct expression
*expr
, int param
, char *key
, char *value
)
1682 db_param_limit_filter(expr
, param
, key
, value
, PARAM_FILTER
);
1685 static void db_param_add_set(struct expression
*expr
, int param
, char *key
, char *value
, enum info_type op
)
1687 struct expression
*arg
;
1690 struct symbol
*type
;
1691 struct smatch_state
*state
;
1692 struct range_list
*new = NULL
;
1693 struct range_list
*added
= NULL
;
1695 while (expr
->type
== EXPR_ASSIGNMENT
)
1696 expr
= strip_expr(expr
->right
);
1697 if (expr
->type
!= EXPR_CALL
)
1700 arg
= get_argument_from_call_expr(expr
->args
, param
);
1703 type
= get_member_type_from_key(arg
, key
);
1704 name
= get_variable_from_key(arg
, key
, &sym
);
1708 state
= get_state(SMATCH_EXTRA
, name
, sym
);
1710 new = estate_rl(state
);
1712 call_results_to_rl(expr
, type
, value
, &added
);
1714 if (op
== PARAM_SET
)
1717 new = rl_union(new, added
);
1719 set_extra_mod(name
, sym
, alloc_estate_rl(new));
1724 static void db_param_add(struct expression
*expr
, int param
, char *key
, char *value
)
1726 db_param_add_set(expr
, param
, key
, value
, PARAM_ADD
);
1729 static void db_param_set(struct expression
*expr
, int param
, char *key
, char *value
)
1731 db_param_add_set(expr
, param
, key
, value
, PARAM_SET
);
1734 static void db_returned_member_info(struct expression
*expr
, int param
, char *key
, char *value
)
1736 struct symbol
*type
;
1739 struct range_list
*rl
;
1741 if (expr
->type
!= EXPR_ASSIGNMENT
)
1744 name
= return_state_to_var_sym(expr
, param
, key
, &sym
);
1747 type
= get_member_type_from_key(expr
->left
, key
);
1750 call_results_to_rl(expr
->right
, type
, value
, &rl
);
1751 set_extra_mod(name
, sym
, alloc_estate_rl(rl
));
1757 static char *in_terms_of_param_math(struct expression
*expr
, char *printed_name
)
1764 var
= expr_to_var_sym(expr
, &sym
);
1767 snprintf(buf
, sizeof(buf
), "%s%s", var
, printed_name
+ 2);
1769 ret
= get_value_in_terms_of_parameter_math_var_sym(buf
, sym
);
1776 static void returned_member_callback(int return_id
, char *return_ranges
, struct expression
*expr
, char *printed_name
, struct smatch_state
*state
)
1782 /* these are handled in smatch_param_filter/set/limit.c */
1783 if (printed_name
[0] != '*' &&
1784 !strchr(printed_name
, '.') && !strchr(printed_name
, '-'))
1787 if (estate_get_single_value(state
, &sval
)) {
1788 sql_insert_return_states(return_id
, return_ranges
, RETURN_VALUE
, -1,
1789 printed_name
, sval_to_str(sval
));
1793 math_str
= in_terms_of_param_math(expr
, printed_name
);
1795 snprintf(buf
, sizeof(buf
), "%s[%s]", state
->name
, math_str
);
1796 sql_insert_return_states(return_id
, return_ranges
, RETURN_VALUE
, -1,
1801 if (estate_is_whole(state
))
1804 sql_insert_return_states(return_id
, return_ranges
, RETURN_VALUE
, -1,
1805 printed_name
, state
->name
);
1808 static void match_call_info(struct expression
*expr
)
1810 struct smatch_state
*state
;
1811 struct range_list
*rl
= NULL
;
1812 struct expression
*arg
;
1813 struct symbol
*type
;
1816 FOR_EACH_PTR(expr
->args
, arg
) {
1817 type
= get_arg_type(expr
->fn
, i
);
1819 if (get_implied_rl(arg
, &rl
))
1820 rl
= cast_rl(type
, rl
);
1822 rl
= cast_rl(type
, alloc_whole_rl(get_type(arg
)));
1824 if (!is_whole_rl(rl
))
1825 sql_insert_caller_info(expr
, PARAM_VALUE
, i
, "$", show_rl(rl
));
1826 state
= get_state_expr(SMATCH_EXTRA
, arg
);
1827 if (estate_has_fuzzy_max(state
)) {
1828 sql_insert_caller_info(expr
, FUZZY_MAX
, i
, "$",
1829 sval_to_str(estate_get_fuzzy_max(state
)));
1832 } END_FOR_EACH_PTR(arg
);
1835 static void set_param_value(const char *name
, struct symbol
*sym
, char *key
, char *value
)
1837 struct range_list
*rl
= NULL
;
1838 struct smatch_state
*state
;
1839 struct symbol
*type
;
1842 if (strcmp(key
, "*$") == 0)
1843 snprintf(fullname
, sizeof(fullname
), "*%s", name
);
1844 else if (strncmp(key
, "$", 1) == 0)
1845 snprintf(fullname
, 256, "%s%s", name
, key
+ 1);
1849 type
= get_member_type_from_key(symbol_expression(sym
), key
);
1850 str_to_rl(type
, value
, &rl
);
1851 state
= alloc_estate_rl(rl
);
1852 set_state(SMATCH_EXTRA
, fullname
, sym
, state
);
1855 static void set_param_hard_max(const char *name
, struct symbol
*sym
, char *key
, char *value
)
1857 struct range_list
*rl
= NULL
;
1858 struct smatch_state
*state
;
1859 struct symbol
*type
;
1863 if (strcmp(key
, "*$") == 0)
1864 snprintf(fullname
, sizeof(fullname
), "*%s", name
);
1865 else if (strncmp(key
, "$", 1) == 0)
1866 snprintf(fullname
, 256, "%s%s", name
, key
+ 1);
1870 state
= get_state(SMATCH_EXTRA
, fullname
, sym
);
1873 type
= get_member_type_from_key(symbol_expression(sym
), key
);
1874 str_to_rl(type
, value
, &rl
);
1875 if (!rl_to_sval(rl
, &max
))
1877 estate_set_fuzzy_max(state
, max
);
1880 void register_smatch_extra(int id
)
1884 add_merge_hook(my_id
, &merge_estates
);
1885 add_unmatched_state_hook(my_id
, &unmatched_state
);
1886 select_caller_info_hook(set_param_value
, PARAM_VALUE
);
1887 select_caller_info_hook(set_param_hard_max
, FUZZY_MAX
);
1888 select_return_states_hook(RETURN_VALUE
, &db_returned_member_info
);
1889 select_return_states_before(&db_limited_before
);
1890 select_return_states_hook(PARAM_LIMIT
, &db_param_limit
);
1891 select_return_states_hook(PARAM_FILTER
, &db_param_filter
);
1892 select_return_states_hook(PARAM_ADD
, &db_param_add
);
1893 select_return_states_hook(PARAM_SET
, &db_param_set
);
1894 select_return_states_after(&db_limited_after
);
1897 void register_smatch_extra_late(int id
)
1899 add_hook(&match_dereferences
, DEREF_HOOK
);
1900 add_hook(&match_pointer_as_array
, OP_HOOK
);
1901 select_call_implies_hook(DEREFERENCE
, &set_param_dereferenced
);
1902 add_hook(&match_function_call
, FUNCTION_CALL_HOOK
);
1903 add_hook(&match_assign
, ASSIGNMENT_HOOK
);
1904 add_hook(&match_assign
, GLOBAL_ASSIGNMENT_HOOK
);
1905 add_hook(&unop_expr
, OP_HOOK
);
1906 add_hook(&asm_expr
, ASM_HOOK
);
1908 add_hook(&match_call_info
, FUNCTION_CALL_HOOK
);
1909 add_member_info_callback(my_id
, struct_member_callback
);
1910 add_returned_member_callback(my_id
, returned_member_callback
);
1912 add_hook(&assume_indexes_are_valid
, OP_HOOK
);