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Typed lists keep an explicit pointer to the list head.

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This change adds one pointer worth of memory to every list node.
Keeping this information helps auditing the lists, checking that the
node indeed is outside of list or inside the right one.

The typed lists shouldn't be used anywhere with memory pressure anyway,
thus the one added pointer isn't significant.
This commit is contained in:
Maria Matejka 2023-04-19 17:52:52 +02:00
parent 67fe3d096d
commit 06963f96b3
1 changed files with 39 additions and 7 deletions
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46
lib/tlists.h
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@ -79,6 +79,11 @@ typedef struct TLIST_LIST_STRUCT {
TLIST_TYPE *last;
} TLIST_LIST_STRUCT;
static inline struct TLIST_LIST_STRUCT * TLIST_NAME(enlisted)(TLIST_TYPE *node)
{
return node->TLIST_ITEM.list;
}
#ifdef TLIST_WANT_WALK
static inline struct TLIST_NAME(node) * TLIST_NAME(node_get)(TLIST_TYPE *node)
{ return &(node->TLIST_ITEM); }
@ -87,11 +92,14 @@ static inline struct TLIST_NAME(node) * TLIST_NAME(node_get)(TLIST_TYPE *node)
#ifdef TLIST_WANT_ADD_HEAD
static inline void TLIST_NAME(add_head)(TLIST_LIST_STRUCT *list, TLIST_TYPE *node)
{
ASSERT_DIE(!node->TLIST_ITEM.prev && !node->TLIST_ITEM.next);
ASSERT_DIE(!TLIST_NAME(enlisted)(node));
node->TLIST_ITEM.list = list;
if (node->TLIST_ITEM.next = list->first)
list->first->TLIST_ITEM.prev = node;
else
list->last = node;
list->first = node;
}
#endif
@ -99,17 +107,39 @@ static inline void TLIST_NAME(add_head)(TLIST_LIST_STRUCT *list, TLIST_TYPE *nod
#ifdef TLIST_WANT_ADD_TAIL
static inline void TLIST_NAME(add_tail)(TLIST_LIST_STRUCT *list, TLIST_TYPE *node)
{
ASSERT_DIE(!node->TLIST_ITEM.prev && !node->TLIST_ITEM.next);
ASSERT_DIE(!TLIST_NAME(enlisted)(node));
node->TLIST_ITEM.list = list;
if (node->TLIST_ITEM.prev = list->last)
list->last->TLIST_ITEM.next = node;
else
list->first = node;
list->last = node;
}
#endif
#ifdef TLIST_WANT_UPDATE_NODE
static inline void TLIST_NAME(update_node)(TLIST_LIST_STRUCT *list, TLIST_TYPE *node)
{
ASSERT_DIE(TLIST_NAME(enlisted)(node) == list);
if (node->TLIST_ITEM.prev)
node->TLIST_ITEM.prev->TLIST_ITEM.next = node;
else
list->first = node;
if (node->TLIST_ITEM.next)
node->TLIST_ITEM.next->TLIST_ITEM.prev = node;
else
list->last = node;
}
#endif
static inline void TLIST_NAME(rem_node)(TLIST_LIST_STRUCT *list, TLIST_TYPE *node)
{
ASSERT_DIE(TLIST_NAME(enlisted)(node) == list);
if (node->TLIST_ITEM.prev)
node->TLIST_ITEM.prev->TLIST_ITEM.next = node->TLIST_ITEM.next;
else
@ -127,6 +157,7 @@ static inline void TLIST_NAME(rem_node)(TLIST_LIST_STRUCT *list, TLIST_TYPE *nod
}
node->TLIST_ITEM.next = node->TLIST_ITEM.prev = NULL;
node->TLIST_ITEM.list = NULL;
}
#undef TLIST_PREFIX
@ -136,6 +167,7 @@ static inline void TLIST_NAME(rem_node)(TLIST_LIST_STRUCT *list, TLIST_TYPE *nod
#undef TLIST_ITEM
#undef TLIST_WANT_ADD_HEAD
#undef TLIST_WANT_ADD_TAIL
#undef TLIST_WANT_UPDATE_NODE
# endif
#else
@ -147,12 +179,12 @@ static inline void TLIST_NAME(rem_node)(TLIST_LIST_STRUCT *list, TLIST_TYPE *nod
#error "You should first include lib/tlists.h without requesting a TLIST"
#endif
#define TLIST_NODE_CONTENTS(_type) { _type *next; _type *prev; }
#define TLIST_NODE(_name, _type) struct _name##_node TLIST_NODE_CONTENTS(_type)
#define TLIST_DEFAULT_NODE struct MACRO_CONCAT_AFTER(TLIST_PREFIX,_node) \
TLIST_NODE_CONTENTS(TLIST_TYPE) TLIST_ITEM
#define TLIST_LIST(_name) struct _name##_list
#define TLIST_LIST(_name) struct _name##_list
#define TLIST_NODE_IN(_name, _type) { _type *next; _type *prev; TLIST_LIST(_name) *list; }
#define TLIST_NODE(_name, _type) struct _name##_node TLIST_NODE_IN(_name, _type)
#define TLIST_DEFAULT_NODE struct MACRO_CONCAT_AFTER(TLIST_PREFIX,_node) \
TLIST_NODE_IN(TLIST_PREFIX,TLIST_TYPE) TLIST_ITEM
/* Use ->first and ->last to access HEAD and TAIL */