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List expensive check.

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This commit is contained in:
Maria Matejka 2019-08-14 16:23:58 +02:00
parent a0d0a71a18
commit baac700906
1 changed files with 61 additions and 0 deletions
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61
lib/lists.c
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@ -29,6 +29,42 @@
#include "nest/bird.h"
#include "lib/lists.h"
LIST_INLINE int
check_list(list *l, node *n)
{
if (!l)
{
ASSERT_DIE(n);
ASSERT_DIE(n->prev);
do { n = n->prev; } while (n->prev);
l = SKIP_BACK(list, head_node, n);
}
int seen = 0;
ASSERT_DIE(l->null == NULL);
ASSERT_DIE(l->head != NULL);
ASSERT_DIE(l->tail != NULL);
node *prev = &l->head_node, *cur = l->head, *next = l->head->next;
while (next)
{
if (cur == n)
seen++;
ASSERT_DIE(cur->prev == prev);
prev = cur;
cur = next;
next = next->next;
}
ASSERT_DIE(cur == &(l->tail_node));
ASSERT_DIE(!n || (seen == 1));
return 1;
}
/**
* add_tail - append a node to a list
* @l: linked list
@ -39,6 +75,10 @@
LIST_INLINE void
add_tail(list *l, node *n)
{
EXPENSIVE_CHECK(check_list(l, NULL));
ASSUME(n->prev == NULL);
ASSUME(n->next == NULL);
node *z = l->tail;
n->next = &l->tail_node;
@ -57,6 +97,10 @@ add_tail(list *l, node *n)
LIST_INLINE void
add_head(list *l, node *n)
{
EXPENSIVE_CHECK(check_list(l, NULL));
ASSUME(n->prev == NULL);
ASSUME(n->next == NULL);
node *z = l->head;
n->next = z;
@ -76,6 +120,10 @@ add_head(list *l, node *n)
LIST_INLINE void
insert_node(node *n, node *after)
{
EXPENSIVE_CHECK(check_list(l, after));
ASSUME(n->prev == NULL);
ASSUME(n->next == NULL);
node *z = after->next;
n->next = z;
@ -93,6 +141,8 @@ insert_node(node *n, node *after)
LIST_INLINE void
rem_node(node *n)
{
EXPENSIVE_CHECK(check_list(NULL, n));
node *z = n->prev;
node *x = n->next;
@ -116,6 +166,10 @@ rem_node(node *n)
LIST_INLINE void
replace_node(node *old, node *new)
{
EXPENSIVE_CHECK(check_list(NULL, old));
ASSUME(new->prev == NULL);
ASSUME(new->next == NULL);
old->next->prev = new;
old->prev->next = new;
@ -149,6 +203,9 @@ init_list(list *l)
LIST_INLINE void
add_tail_list(list *to, list *l)
{
EXPENSIVE_CHECK(check_list(to, NULL));
EXPENSIVE_CHECK(check_list(l, NULL));
node *p = to->tail;
node *q = l->head;
@ -157,6 +214,8 @@ add_tail_list(list *to, list *l)
q = l->tail;
q->next = &to->tail_node;
to->tail = q;
EXPENSIVE_CHECK(check_list(to, NULL));
}
LIST_INLINE uint
@ -165,6 +224,8 @@ list_length(list *l)
uint len = 0;
node *n;
EXPENSIVE_CHECK(check_list(l, NULL));
WALK_LIST(n, *l)
len++;