2 * Copyright (C) 2012 Oracle.
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 * The point here is to store that a buffer has x bytes even if we don't know
25 #include "smatch_extra.h"
26 #include "smatch_slist.h"
32 * There is a bunch of code which does this:
37 * So if "size" is non-zero then the size of "foo" is size. But really it's
38 * also true if size is zero. It's just better to assume to not trample over
39 * the data that we have by merging &undefined states.
42 static struct smatch_state
*unmatched_state(struct sm_state
*sm
)
47 static struct smatch_state
*merge_links(struct smatch_state
*s1
, struct smatch_state
*s2
)
49 struct expression
*expr1
, *expr2
;
54 if (expr1
&& expr2
&& expr_equiv(expr1
, expr2
))
59 static struct expression
*ignore_link_mod
;
60 static void match_link_modify(struct sm_state
*sm
, struct expression
*mod_expr
)
62 struct expression
*expr
;
65 if (mod_expr
== ignore_link_mod
)
67 ignore_link_mod
= NULL
;
69 expr
= sm
->state
->data
;
71 set_state_expr(size_id
, expr
, &undefined
);
72 set_state(link_id
, sm
->name
, sm
->sym
, &undefined
);
76 FOR_EACH_PTR(sm
->possible
, tmp
) {
77 expr
= tmp
->state
->data
;
79 set_state_expr(size_id
, expr
, &undefined
);
80 } END_FOR_EACH_PTR(tmp
);
81 set_state(link_id
, sm
->name
, sm
->sym
, &undefined
);
84 static void add_link(struct expression
*size
, struct expression
*buf
, struct expression
*mod_expr
)
86 ignore_link_mod
= mod_expr
;
87 set_state_expr(link_id
, size
, alloc_state_expr(buf
));
90 static const char *limit_map
[] = {
98 int state_to_limit(struct smatch_state
*state
)
102 if (!state
|| !state
->data
)
105 for (i
= 0; i
< ARRAY_SIZE(limit_map
); i
++) {
106 if (strncmp(state
->name
, limit_map
[i
], strlen(limit_map
[i
])) == 0)
107 return i
+ BYTE_COUNT
;
113 const char *limit_type_str(unsigned int limit_type
)
115 if (limit_type
- BYTE_COUNT
>= ARRAY_SIZE(limit_map
)) {
116 sm_msg("internal: wrong size type %u", limit_type
);
120 return limit_map
[limit_type
- BYTE_COUNT
];
123 static struct smatch_state
*alloc_compare_size(int limit_type
, struct expression
*expr
)
125 struct smatch_state
*state
;
129 state
= __alloc_smatch_state(0);
130 expr
= strip_expr(expr
);
131 name
= expr_to_str(expr
);
132 snprintf(buf
, sizeof(buf
), "%s %s", limit_type_str(limit_type
), name
);
133 state
->name
= alloc_sname(buf
);
139 static int bytes_per_element(struct expression
*expr
)
143 type
= get_type(expr
);
147 if (type
->type
!= SYM_PTR
&& type
->type
!= SYM_ARRAY
)
150 type
= get_base_type(type
);
151 return type_bytes(type
);
154 static void db_save_type_links(struct expression
*array
, int type_limit
, struct expression
*size
)
156 const char *array_name
;
158 array_name
= get_data_info_name(array
);
161 sql_insert_data_info(size
, type_limit
, array_name
);
164 static void match_alloc_helper(struct expression
*pointer
, struct expression
*size
, struct expression
*mod_expr
)
166 struct smatch_state
*state
;
167 struct expression
*tmp
;
169 int limit_type
= BYTE_COUNT
;
172 pointer
= strip_expr(pointer
);
173 size
= strip_expr(size
);
174 if (!size
|| !pointer
)
177 tmp
= get_assigned_expr_recurse(size
);
178 if (tmp
&& tmp
->op
== EXPR_BINOP
)
179 size
= strip_expr(tmp
);
181 if (size
->type
== EXPR_BINOP
&& size
->op
== '*') {
182 struct expression
*mult_left
, *mult_right
;
184 mult_left
= strip_expr(size
->left
);
185 mult_right
= strip_expr(size
->right
);
187 if (get_implied_value(mult_left
, &sval
) &&
188 sval
.value
== bytes_per_element(pointer
))
190 else if (get_implied_value(mult_right
, &sval
) &&
191 sval
.value
== bytes_per_element(pointer
))
195 limit_type
= ELEM_COUNT
;
198 /* Only save links to variables, not fixed sizes */
199 if (get_value(size
, &sval
))
202 if (size
->type
== EXPR_BINOP
&& size
->op
== '+' &&
203 get_value(size
->right
, &sval
) && sval
.value
== 1) {
205 limit_type
= ELEM_LAST
;
208 db_save_type_links(pointer
, limit_type
, size
);
209 state
= alloc_compare_size(limit_type
, size
);
210 sm
= set_state_expr(size_id
, pointer
, state
);
213 add_link(size
, pointer
, mod_expr
);
216 static void match_alloc(const char *fn
, struct expression
*expr
, void *_size_arg
)
218 int size_arg
= PTR_INT(_size_arg
);
219 struct expression
*pointer
, *call
, *arg
;
221 pointer
= strip_expr(expr
->left
);
222 call
= strip_expr(expr
->right
);
223 arg
= get_argument_from_call_expr(call
->args
, size_arg
);
224 match_alloc_helper(pointer
, arg
, expr
);
227 static void match_calloc(const char *fn
, struct expression
*expr
, void *_start_arg
)
229 struct smatch_state
*state
;
230 int start_arg
= PTR_INT(_start_arg
);
231 struct expression
*pointer
, *call
, *arg
;
232 struct sm_state
*tmp
;
233 int limit_type
= ELEM_COUNT
;
236 pointer
= strip_expr(expr
->left
);
237 call
= strip_expr(expr
->right
);
238 arg
= get_argument_from_call_expr(call
->args
, start_arg
);
239 if (get_implied_value(arg
, &sval
) &&
240 sval
.value
== bytes_per_element(pointer
))
241 arg
= get_argument_from_call_expr(call
->args
, start_arg
+ 1);
243 if (arg
->type
== EXPR_BINOP
&& arg
->op
== '+' &&
244 get_value(arg
->right
, &sval
) && sval
.value
== 1) {
246 limit_type
= ELEM_LAST
;
249 state
= alloc_compare_size(limit_type
, arg
);
250 db_save_type_links(pointer
, limit_type
, arg
);
251 tmp
= set_state_expr(size_id
, pointer
, state
);
254 add_link(arg
, pointer
, expr
);
257 static struct expression
*get_size_variable_from_binop(struct expression
*expr
, int *limit_type
)
259 struct smatch_state
*state
;
260 struct expression
*ret
;
266 if (!get_value(expr
->right
, &offset
))
268 state
= get_state_expr(size_id
, expr
->left
);
269 if (!state
|| !state
->data
)
272 type
= get_type(expr
->left
);
273 if (!type_is_ptr(type
))
275 type
= get_real_base_type(type
);
276 if (!type_bytes(type
))
278 offset_bytes
= offset
.value
* type_bytes(type
);
281 if (ret
->type
!= EXPR_BINOP
|| ret
->op
!= '+')
284 *limit_type
= state_to_limit(state
);
286 if (get_value(ret
->left
, &orig_fixed
) && orig_fixed
.value
== offset_bytes
)
288 if (get_value(ret
->right
, &orig_fixed
) && orig_fixed
.value
== offset_bytes
)
294 struct expression
*get_size_variable(struct expression
*buf
, int *limit_type
)
296 struct smatch_state
*state
;
297 struct expression
*ret
;
299 buf
= strip_expr(buf
);
302 if (buf
->type
== EXPR_BINOP
&& buf
->op
== '+') {
303 ret
= get_size_variable_from_binop(buf
, limit_type
);
308 state
= get_state_expr(size_id
, buf
);
311 *limit_type
= state_to_limit(state
);
315 struct expression
*get_array_variable(struct expression
*size
)
317 struct smatch_state
*state
;
319 state
= get_state_expr(link_id
, size
);
325 static void array_check(struct expression
*expr
)
327 struct expression
*array
;
328 struct expression
*size
;
329 struct expression
*offset
;
330 char *array_str
, *offset_str
;
333 expr
= strip_expr(expr
);
337 array
= get_array_base(expr
);
338 size
= get_size_variable(array
, &limit_type
);
341 if (limit_type
!= ELEM_COUNT
)
343 offset
= get_array_offset(expr
);
344 if (!possible_comparison(size
, SPECIAL_EQUAL
, offset
))
346 if (getting_address(expr
))
349 array_str
= expr_to_str(array
);
350 offset_str
= expr_to_str(offset
);
351 sm_warning("potentially one past the end of array '%s[%s]'", array_str
, offset_str
);
352 free_string(array_str
);
353 free_string(offset_str
);
361 static int db_limitter_callback(void *_info
, int argc
, char **argv
, char **azColName
)
363 struct db_info
*info
= _info
;
366 * If possible the limitters are tied to the struct they limit. If we
367 * aren't sure which struct they limit then we use them as limitters for
370 if (!info
->name
|| argv
[0][0] == '\0' || strcmp(info
->name
, argv
[0]) == 0)
375 static char *vsl_to_data_info_name(const char *name
, struct var_sym_list
*vsl
)
382 if (ptr_list_size((struct ptr_list
*)vsl
) != 1)
384 vs
= first_ptr_list((struct ptr_list
*)vsl
);
386 type
= get_real_base_type(vs
->sym
);
387 if (!type
|| type
->type
!= SYM_PTR
)
389 type
= get_real_base_type(type
);
390 if (!type
|| type
->type
!= SYM_STRUCT
)
396 while ((name
= strstr(p
, "->")))
399 snprintf(buf
, sizeof(buf
),"(struct %s)->%s", type
->ident
->name
, p
);
400 return alloc_sname(buf
);
403 if (!(vs
->sym
->ctype
.modifiers
& MOD_TOPLEVEL
))
405 if (vs
->sym
->ctype
.modifiers
& MOD_STATIC
)
406 snprintf(buf
, sizeof(buf
),"static %s", name
);
408 snprintf(buf
, sizeof(buf
),"global %s", name
);
409 return alloc_sname(buf
);
412 int db_var_is_array_limit(struct expression
*array
, const char *name
, struct var_sym_list
*vsl
)
415 char *array_name
= get_data_info_name(array
);
416 struct db_info db_info
= {.name
= array_name
,};
418 size_name
= vsl_to_data_info_name(name
, vsl
);
422 run_sql(db_limitter_callback
, &db_info
,
423 "select value from data_info where type = %d and data = '%s';",
424 ARRAY_LEN
, size_name
);
429 int buf_comparison_index_ok(struct expression
*expr
)
431 struct expression
*array
;
432 struct expression
*size
;
433 struct expression
*offset
;
437 array
= get_array_base(expr
);
438 size
= get_size_variable(array
, &limit_type
);
441 offset
= get_array_offset(expr
);
442 comparison
= get_comparison(offset
, size
);
446 if ((limit_type
== ELEM_COUNT
|| limit_type
== ELEM_LAST
) &&
447 (comparison
== '<' || comparison
== SPECIAL_UNSIGNED_LT
))
449 if (limit_type
== ELEM_LAST
&&
450 (comparison
== SPECIAL_LTE
||
451 comparison
== SPECIAL_UNSIGNED_LTE
||
452 comparison
== SPECIAL_EQUAL
))
458 bool buf_comp_has_bytes(struct expression
*buf
, struct expression
*var
)
460 struct expression
*size
;
464 if (buf_comp2_has_bytes(buf
, var
))
467 size
= get_size_variable(buf
, &limit_type
);
470 comparison
= get_comparison(size
, var
);
471 if (comparison
== UNKNOWN_COMPARISON
||
472 comparison
== IMPOSSIBLE_COMPARISON
)
475 if (show_special(comparison
)[0] == '<' ||
476 show_special(comparison
)[0] == '=')
482 static int known_access_ok_numbers(struct expression
*expr
)
484 struct expression
*array
;
485 struct expression
*offset
;
489 array
= get_array_base(expr
);
490 offset
= get_array_offset(expr
);
492 size
= get_array_size(array
);
496 get_absolute_max(offset
, &max
);
497 if (max
.uvalue
< size
)
502 static void array_check_data_info(struct expression
*expr
)
504 struct expression
*array
;
505 struct expression
*offset
;
506 struct state_list
*slist
;
508 struct compare_data
*comp
;
510 const char *equal_name
= NULL
;
512 expr
= strip_expr(expr
);
516 if (known_access_ok_numbers(expr
))
518 if (buf_comparison_index_ok(expr
))
521 array
= get_array_base(expr
);
522 offset
= get_array_offset(expr
);
523 offset_name
= expr_to_var(offset
);
526 slist
= get_all_possible_equal_comparisons(offset
);
530 FOR_EACH_PTR(slist
, sm
) {
531 comp
= sm
->state
->data
;
532 if (strcmp(comp
->left_var
, offset_name
) == 0) {
533 if (db_var_is_array_limit(array
, comp
->right_var
, comp
->right_vsl
)) {
534 equal_name
= comp
->right_var
;
537 } else if (strcmp(comp
->right_var
, offset_name
) == 0) {
538 if (db_var_is_array_limit(array
, comp
->left_var
, comp
->left_vsl
)) {
539 equal_name
= comp
->left_var
;
543 } END_FOR_EACH_PTR(sm
);
546 char *array_name
= expr_to_str(array
);
548 sm_warning("potential off by one '%s[]' limit '%s'", array_name
, equal_name
);
549 free_string(array_name
);
554 free_string(offset_name
);
557 static void add_allocation_function(const char *func
, void *call_back
, int param
)
559 add_function_assign_hook(func
, call_back
, INT_PTR(param
));
562 static int is_sizeof(struct expression
*expr
)
566 if (expr
->type
== EXPR_SIZEOF
)
568 name
= pos_ident(expr
->pos
);
569 if (name
&& strcmp(name
, "sizeof") == 0)
574 static int match_size_binop(struct expression
*size
, struct expression
*expr
, int *limit_type
)
576 int orig_type
= *limit_type
;
577 struct expression
*left
;
581 if (!expr_equiv(size
, left
))
584 if (expr
->op
== '-' &&
585 get_value(expr
->right
, &sval
) &&
587 orig_type
== ELEM_COUNT
) {
588 *limit_type
= ELEM_LAST
;
592 if (expr
->op
== '+' &&
593 get_value(expr
->right
, &sval
) &&
595 orig_type
== ELEM_LAST
) {
596 *limit_type
= ELEM_COUNT
;
600 if (expr
->op
== '*' &&
601 is_sizeof(expr
->right
) &&
602 orig_type
== ELEM_COUNT
) {
603 *limit_type
= BYTE_COUNT
;
607 if (expr
->op
== '/' &&
608 is_sizeof(expr
->right
) &&
609 orig_type
== BYTE_COUNT
) {
610 *limit_type
= ELEM_COUNT
;
617 static char *buf_size_param_comparison(struct expression
*array
, struct expression_list
*args
, int *limit_type
)
619 struct expression
*tmp
, *arg
;
620 struct expression
*size
;
624 size
= get_size_variable(array
, limit_type
);
628 if (*limit_type
== USED_LAST
)
629 *limit_type
= ELEM_LAST
;
630 if (*limit_type
== USED_COUNT
)
631 *limit_type
= ELEM_COUNT
;
634 FOR_EACH_PTR(args
, tmp
) {
639 if (expr_equiv(arg
, size
) ||
640 (arg
->type
== EXPR_BINOP
&&
641 match_size_binop(size
, arg
, limit_type
))) {
642 snprintf(buf
, sizeof(buf
), "==$%d", i
);
645 } END_FOR_EACH_PTR(tmp
);
650 static void match_call(struct expression
*call
)
652 struct expression
*arg
;
659 FOR_EACH_PTR(call
->args
, arg
) {
661 if (!is_pointer(arg
))
663 compare
= buf_size_param_comparison(arg
, call
->args
, &limit_type
);
666 snprintf(buf
, sizeof(buf
), "%d", limit_type
);
667 sql_insert_caller_info(call
, limit_type
, param
, compare
, buf
);
668 } END_FOR_EACH_PTR(arg
);
671 static int get_param(int param
, char **name
, struct symbol
**sym
)
677 FOR_EACH_PTR(cur_func_sym
->ctype
.base_type
->arguments
, arg
) {
679 * this is a temporary hack to work around a bug (I think in sparse?)
680 * 2.6.37-rc1:fs/reiserfs/journal.o
681 * If there is a function definition without parameter name found
682 * after a function implementation then it causes a crash.
686 if (arg
->ident
->name
< (char *)100)
689 *name
= arg
->ident
->name
;
694 } END_FOR_EACH_PTR(arg
);
699 static void set_param_compare(const char *array_name
, struct symbol
*array_sym
, char *key
, char *value
)
701 struct smatch_state
*state
;
702 struct expression
*array_expr
;
703 struct expression
*size_expr
;
704 struct symbol
*size_sym
;
707 struct sm_state
*tmp
;
710 if (strncmp(key
, "==$", 3) != 0)
712 param
= strtol(key
+ 3, NULL
, 10);
713 if (!get_param(param
, &size_name
, &size_sym
))
715 array_expr
= symbol_expression(array_sym
);
716 size_expr
= symbol_expression(size_sym
);
717 limit_type
= strtol(value
, NULL
, 10);
719 state
= alloc_compare_size(limit_type
, size_expr
);
720 tmp
= set_state_expr(size_id
, array_expr
, state
);
723 add_link(size_expr
, array_expr
, NULL
);
726 static void set_implied(struct expression
*call
, struct expression
*array_expr
, char *key
, char *value
)
728 struct expression
*size_expr
;
729 struct symbol
*size_sym
;
732 struct sm_state
*tmp
;
735 if (strncmp(key
, "==$", 3) != 0)
737 param
= strtol(key
+ 3, NULL
, 10);
738 if (!get_param(param
, &size_name
, &size_sym
))
740 size_expr
= symbol_expression(size_sym
);
742 limit_type
= strtol(value
, NULL
, 10);
743 tmp
= set_state_expr(size_id
, array_expr
, alloc_compare_size(limit_type
, size_expr
));
746 add_link(size_expr
, array_expr
, call
);
749 static void munge_start_states(struct statement
*stmt
)
751 struct state_list
*slist
= NULL
;
753 struct sm_state
*poss
;
755 FOR_EACH_MY_SM(size_id
, __get_cur_stree(), sm
) {
756 if (sm
->state
!= &merged
)
759 * screw it. let's just assume that if one caller passes the
760 * size then they all do.
762 FOR_EACH_PTR(sm
->possible
, poss
) {
763 if (poss
->state
!= &merged
&&
764 poss
->state
!= &undefined
) {
765 add_ptr_list(&slist
, poss
);
768 } END_FOR_EACH_PTR(poss
);
769 } END_FOR_EACH_SM(sm
);
771 FOR_EACH_PTR(slist
, sm
) {
772 set_state(size_id
, sm
->name
, sm
->sym
, sm
->state
);
773 } END_FOR_EACH_PTR(sm
);
778 static void set_used(struct expression
*expr
)
780 struct expression
*parent
;
781 struct expression
*array
;
782 struct expression
*offset
;
783 struct sm_state
*tmp
;
786 if (expr
->op
!= SPECIAL_INCREMENT
)
789 limit_type
= USED_LAST
;
790 if (expr
->type
== EXPR_POSTOP
)
791 limit_type
= USED_COUNT
;
793 parent
= expr_get_parent_expr(expr
);
794 if (!parent
|| parent
->type
!= EXPR_BINOP
)
796 parent
= expr_get_parent_expr(parent
);
797 if (!parent
|| !is_array(parent
))
800 array
= get_array_base(parent
);
801 offset
= get_array_offset(parent
);
805 tmp
= set_state_expr(size_id
, array
, alloc_compare_size(limit_type
, offset
->unop
));
808 add_link(offset
->unop
, array
, expr
);
811 static int match_assign_array(struct expression
*expr
)
817 static int match_assign_size(struct expression
*expr
)
819 struct expression
*right
, *size
, *array
;
820 struct smatch_state
*state
;
821 struct sm_state
*tmp
;
826 if (size
->type
== EXPR_BINOP
)
829 array
= get_array_variable(size
);
832 state
= get_state_expr(size_id
, array
);
833 if (!state
|| !state
->data
)
836 limit_type
= state_to_limit(state
);
840 if (right
->type
== EXPR_BINOP
&& !match_size_binop(size
, right
, &limit_type
))
843 tmp
= set_state_expr(size_id
, array
, alloc_compare_size(limit_type
, expr
->left
));
846 add_link(expr
->left
, array
, expr
);
850 static bool match_assign_smaller(struct expression
*expr
)
852 struct expression
*array
;
856 array
= get_array_variable(expr
->left
);
860 if (get_value(expr
->right
, &sval
))
863 comparison
= get_comparison(expr
->left
, expr
->right
);
864 if (comparison
== UNKNOWN_COMPARISON
||
865 comparison
== IMPOSSIBLE_COMPARISON
)
868 /* This is assigning a smaller value to the variable than what it was. */
869 if (show_special(comparison
)[0] != '>')
873 * This module doesn't have a way to say that it's less than the limit
874 * only that it *is* the limit. So you might expect to set a state here
875 * but there is already a state so all we can do is ignore the
878 ignore_link_mod
= expr
;
882 static void match_assign(struct expression
*expr
)
887 if (is_fake_var_assign(expr
))
890 if (match_assign_array(expr
))
892 if (match_assign_size(expr
))
894 if (match_assign_smaller(expr
))
898 static void match_copy(const char *fn
, struct expression
*expr
, void *unused
)
900 struct expression
*src
, *size
;
901 int src_param
, size_param
;
903 src
= get_argument_from_call_expr(expr
->args
, 1);
904 size
= get_argument_from_call_expr(expr
->args
, 2);
905 src
= strip_expr(src
);
906 size
= strip_expr(size
);
909 if (src
->type
!= EXPR_SYMBOL
|| size
->type
!= EXPR_SYMBOL
)
912 src_param
= get_param_num_from_sym(src
->symbol
);
913 size_param
= get_param_num_from_sym(size
->symbol
);
914 if (src_param
< 0 || size_param
< 0)
917 sql_insert_cache(call_implies
, "'%s', '%s', 0, %d, %d, %d, '==$%d', '%d'",
918 get_base_file(), get_function(), fn_static(),
919 BYTE_COUNT
, src_param
, size_param
, BYTE_COUNT
);
922 void register_buf_comparison(int id
)
928 set_dynamic_states(size_id
);
930 add_unmatched_state_hook(size_id
, &unmatched_state
);
932 add_allocation_function("malloc", &match_alloc
, 0);
933 add_allocation_function("memdup", &match_alloc
, 1);
934 add_allocation_function("realloc", &match_alloc
, 1);
935 if (option_project
== PROJ_KERNEL
) {
936 add_allocation_function("kmalloc", &match_alloc
, 0);
937 add_allocation_function("kzalloc", &match_alloc
, 0);
938 add_allocation_function("vmalloc", &match_alloc
, 0);
939 add_allocation_function("__vmalloc", &match_alloc
, 0);
940 add_allocation_function("sock_kmalloc", &match_alloc
, 1);
941 add_allocation_function("kmemdup", &match_alloc
, 1);
942 add_allocation_function("memdup_user", &match_alloc
, 1);
943 add_allocation_function("dma_alloc_attrs", &match_alloc
, 1);
944 add_allocation_function("dma_alloc_coherent", &match_alloc
, 1);
945 add_allocation_function("devm_kmalloc", &match_alloc
, 1);
946 add_allocation_function("devm_kzalloc", &match_alloc
, 1);
947 add_allocation_function("kcalloc", &match_calloc
, 0);
948 add_allocation_function("devm_kcalloc", &match_calloc
, 1);
949 add_allocation_function("kmalloc_array", &match_calloc
, 0);
950 add_allocation_function("krealloc", &match_alloc
, 1);
952 add_function_hook("copy_from_user", &match_copy
, NULL
);
953 add_function_hook("__copy_from_user", &match_copy
, NULL
);
956 add_hook(&array_check
, OP_HOOK
);
957 add_hook(&array_check_data_info
, OP_HOOK
);
958 add_hook(&set_used
, OP_HOOK
);
960 add_hook(&match_call
, FUNCTION_CALL_HOOK
);
961 add_hook(&munge_start_states
, AFTER_DEF_HOOK
);
963 add_hook(&match_assign
, ASSIGNMENT_HOOK
);
965 for (i
= BYTE_COUNT
; i
<= USED_COUNT
; i
++) {
966 select_call_implies_hook(i
, &set_implied
);
967 select_caller_info_hook(set_param_compare
, i
);
968 select_return_implies_hook(i
, &set_implied
);
972 void register_buf_comparison_links(int id
)
975 set_dynamic_states(link_id
);
976 add_merge_hook(link_id
, &merge_links
);
977 add_modification_hook_late(link_id
, &match_link_modify
);