/* Licensed under BSD-MIT - see LICENSE file for details */
#include <ccan/tal/tal.h>
#include <ccan/compiler/compiler.h>
-#include <ccan/hash/hash.h>
#include <ccan/list/list.h>
#include <ccan/take/take.h>
#include <assert.h>
//#define TAL_DEBUG 1
-/* How large should grouips get? */
-#define GROUP_NODE_AVERAGE 32
-
/* 32-bit type field, first byte 0 in either endianness. */
enum prop_type {
CHILDREN = 0x00c1d500,
- GROUP = 0x00600d00,
DESTRUCTOR = 0x00de5700,
NAME = 0x00111100,
};
struct tal_hdr {
- struct tal_hdr *next;
+ struct list_node list;
struct prop_hdr *prop;
+ struct children *parent_child;
};
struct prop_hdr {
struct prop_hdr *next;
};
-/* Unlike other properties, this is owned by parent, not child! */
-struct group {
- struct prop_hdr hdr; /* GROUP */
- struct list_head list; /* Head for child->group, node for others. */
- /* We point to parent's children property, as it doesn't move! */
- struct children *parent_child;
- struct tal_hdr *first_child;
-};
-
struct children {
struct prop_hdr hdr; /* CHILDREN */
struct tal_hdr *parent;
- /* We always have one group. Others may be added. */
- struct group group;
+ struct list_head children; /* Head of siblings. */
};
struct destructor {
static struct {
struct tal_hdr hdr;
struct children c;
-} null_parent = { { NULL, &null_parent.c.hdr },
+} null_parent = { { { &null_parent.hdr.list, &null_parent.hdr.list },
+ &null_parent.c.hdr, NULL },
{ { CHILDREN, NULL },
&null_parent.hdr,
- { { GROUP, NULL },
- { { &null_parent.c.group.list.n,
- &null_parent.c.group.list.n } },
- &null_parent.c, NULL } }
+ { { &null_parent.c.children.n,
+ &null_parent.c.children.n } }
+ }
};
errorfn(msg);
}
-static bool get_destroying_bit(struct tal_hdr *next)
-{
- return (size_t)next & 1;
-}
-
-static void set_destroying_bit(struct tal_hdr **next)
+static bool get_destroying_bit(struct children *parent_child)
{
- *next = (void *)((size_t)next | 1);
+ return (size_t)parent_child & 1;
}
-static struct tal_hdr *ignore_destroying_bit(struct tal_hdr *next)
+static void set_destroying_bit(struct children **parent_child)
{
- return (void *)((size_t)next & ~(size_t)1);
+ *parent_child = (void *)((size_t)*parent_child | 1);
}
-static struct group *next_group(struct group *group)
+static struct children *ignore_destroying_bit(struct children *parent_child)
{
- return list_entry(group->list.n.next, struct group, list.n);
+ return (void *)((size_t)parent_child & ~(size_t)1);
}
static bool initialized = false;
/* This means valgrind can see leaks. */
static void tal_cleanup(void)
{
- struct group *i, *next;
+ struct tal_hdr *i;
- /* Unlink null_parent. */
- for (i = next_group(&null_parent.c.group);
- i != &null_parent.c.group;
- i = next) {
- next = next_group(i);
- freefn(i);
- }
- null_parent.c.group.first_child = NULL;
+ while ((i = list_top(&null_parent.c.children, struct tal_hdr, list)))
+ list_del(&i->list);
/* Cleanup any taken pointers. */
take_cleanup();
tal_free(p);
}
+/* We carefully start all real properties with a zero byte. */
+static bool is_literal(const struct prop_hdr *prop)
+{
+ return ((char *)prop)[0] != 0;
+}
+
#ifndef NDEBUG
static const void *bounds_start, *bounds_end;
-static void update_bounds(const void *new)
+static void update_bounds(const void *new, size_t size)
{
- if (unlikely(!bounds_start))
- bounds_start = bounds_end = new;
- else if (new < bounds_start)
+ if (unlikely(!bounds_start)) {
+ bounds_start = new;
+ bounds_end = (char *)new + size;
+ } else if (new < bounds_start)
bounds_start = new;
- else if (new > bounds_end)
- bounds_end = new;
+ else if ((char *)new + size > (char *)bounds_end)
+ bounds_end = (char *)new + size;
}
static bool in_bounds(const void *p)
{
- return !p || (p >= bounds_start && p <= bounds_end);
+ return !p
+ || (p >= (void *)&null_parent && p <= (void *)(&null_parent + 1))
+ || (p >= bounds_start && p <= bounds_end);
}
#else
-static void update_bounds(const void *new)
+static void update_bounds(const void *new, size_t size)
{
}
t = (struct tal_hdr *)((char *)ctx - sizeof(struct tal_hdr));
check_bounds(t);
- check_bounds(ignore_destroying_bit(t->next));
+ if (t->prop && !is_literal(t->prop))
+ check_bounds(t->prop);
+ check_bounds(ignore_destroying_bit(t->parent_child));
+ check_bounds(t->list.next);
+ check_bounds(t->list.prev);
return t;
}
if (!ret)
call_error("allocation failed");
else
- update_bounds(ret);
+ update_bounds(ret, size);
return ret;
}
-/* We carefully start all real properties with a zero byte. */
-static bool is_literal(const struct prop_hdr *prop)
-{
- return ((char *)prop)[0] != 0;
-}
-
static struct prop_hdr **find_property_ptr(const struct tal_hdr *t,
enum prop_type type)
{
return prop;
}
-static void init_group_property(struct group *group,
- struct children *parent_child,
- struct tal_hdr *child)
-{
- init_property(&group->hdr, child, GROUP);
- group->parent_child = parent_child;
- group->first_child = child;
-}
-
static struct children *add_child_property(struct tal_hdr *parent,
struct tal_hdr *child)
{
if (prop) {
init_property(&prop->hdr, parent, CHILDREN);
prop->parent = parent;
-
- init_group_property(&prop->group, prop, child);
- list_head_init(&prop->group.list);
- update_bounds(&prop->group);
+ list_head_init(&prop->children);
}
return prop;
}
-static struct group *add_group_property(struct tal_hdr *child,
- struct children *parent_child)
-{
- struct group *prop = allocate(sizeof(*prop));
- if (prop)
- init_group_property(prop, parent_child, child);
- return prop;
-}
-
static bool add_child(struct tal_hdr *parent, struct tal_hdr *child)
{
- struct group *group;
struct children *children = find_property(parent, CHILDREN);
if (!children) {
- children = add_child_property(parent, child);
- if (!children)
- return false;
- list_head_init(&children->group.list);
-
- /* Child links to itself. */
- child->next = child;
- return true;
- }
-
- /* Last one (may be children->group itself). */
- group = next_group(&children->group);
-
- /* Empty group can happen: null_parent, or all children freed. */
- if (unlikely(!group->first_child)) {
- assert(group == &children->group);
- /* This hits on first child appended to null parent. */
if (unlikely(!initialized)) {
atexit(tal_cleanup);
take_allocfail(take_alloc_failed);
initialized = true;
}
- /* Link group into this child, make it the first one. */
- group->hdr.next = child->prop;
- child->prop = &group->hdr;
- group->first_child = child;
-
- /* Child links to itself. */
- child->next = child;
- return true;
+ children = add_child_property(parent, child);
+ if (!children)
+ return false;
}
-
- if (unlikely(hash_pointer(child, 0) % GROUP_NODE_AVERAGE == 0)) {
- struct group *newgroup;
-
- newgroup = add_group_property(child, children);
- if (likely(newgroup)) {
- list_add(&children->group.list, &newgroup->list.n);
-
- /* Child links to itself. */
- child->next = child;
- return true;
- }
- /* Fall through: on allocation failure reuse old group. */
- }
-
- /* We insert after head, otherwise we'd need to find end. */
- child->next = group->first_child->next;
- group->first_child->next = child;
+ list_add(&children->children, &child->list);
+ child->parent_child = children;
return true;
}
struct prop_hdr **prop, *p, *next;
/* Already being destroyed? Don't loop. */
- if (unlikely(get_destroying_bit(t->next)))
+ if (unlikely(get_destroying_bit(t->parent_child)))
return;
- set_destroying_bit(&t->next);
+ set_destroying_bit(&t->parent_child);
/* Carefully call destructors, removing as we go. */
while ((prop = find_property_ptr(t, DESTRUCTOR))) {
/* Now free children and groups. */
prop = find_property_ptr(t, CHILDREN);
if (prop) {
+ struct tal_hdr *i;
struct children *c = (struct children *)*prop;
- struct group *group, *next;
-
- group = &c->group;
- do {
- next = next_group(group);
- if (group->first_child) {
- struct tal_hdr *i, *nextc;
-
- i = group->first_child;
- do {
- nextc = i->next;
- del_tree(i);
- i = nextc;
- } while (i != group->first_child);
- }
- if (group != &c->group)
- freefn(group);
- group = next;
- } while (group != &c->group);
+
+ while ((i = list_top(&c->children, struct tal_hdr, list))) {
+ list_del(&i->list);
+ del_tree(i);
+ }
}
- /* Finally free our properties (groups are freed by parent). */
+ /* Finally free our properties. */
for (p = t->prop; p && !is_literal(p); p = next) {
next = p->next;
- if (p->type != GROUP)
- freefn(p);
+ freefn(p);
}
freefn(t);
}
return from_tal_hdr(debug_tal(child));
}
-/* Update back ptrs, etc, as required.
- * May return pointer to parent. */
-static struct tal_hdr *remove_node(struct tal_hdr *t)
-{
- struct prop_hdr **prop;
- struct tal_hdr *prev;
-
- /* Loop around to find previous node. */
- for (prev = t->next; prev->next != t; prev = prev->next);
-
- /* Unlink ourselves. */
- prev->next = t->next;
-
- /* Are we the node with the group property? */
- prop = find_property_ptr(t, GROUP);
- if (prop) {
- struct group *group = (struct group *)*prop;
-
- /* Are we the only one? */
- if (prev == t) {
- struct prop_hdr *next = (*prop)->next;
- struct children *c = group->parent_child;
- /* Is this the group embedded in the child property? */
- if (group == &c->group) {
- group->first_child = NULL;
- } else {
- /* Empty group, so free it. */
- list_del_from(&c->group.list, &group->list.n);
- freefn(group);
- }
- *prop = next;
- return c->parent;
- } else {
- /* Move property to next node. */
- group->first_child = t->next;
-
- *prop = group->hdr.next;
- group->hdr.next = t->next->prop;
- t->next->prop = &group->hdr;
- }
- }
- return NULL;
-}
-
void *tal_free(const tal_t *ctx)
{
if (ctx) {
struct tal_hdr *t;
int saved_errno = errno;
t = debug_tal(to_tal_hdr(ctx));
- remove_node(t);
+ list_del(&t->list);
del_tree(t);
errno = saved_errno;
}
void *tal_steal_(const tal_t *new_parent, const tal_t *ctx)
{
if (ctx) {
- struct tal_hdr *newpar, *t, *old_next, *old_parent;
+ struct tal_hdr *newpar, *t, *old_parent;
newpar = debug_tal(to_tal_hdr_or_null(new_parent));
t = debug_tal(to_tal_hdr(ctx));
- /* Save enough data to get us back if we fail! */
- old_next = t->next;
-
/* Unlink it from old parent. */
- old_parent = remove_node(t);
+ list_del(&t->list);
+ old_parent = ignore_destroying_bit(t->parent_child)->parent;
+
if (unlikely(!add_child(newpar, t))) {
- /* If we were last child, parent returned by
- * remove_node, otherwise search old siblings
- * for it. */
- if (!old_parent) {
- struct group *g;
- while (!(g = find_property(old_next, GROUP)))
- old_next = old_next->next;
- old_parent = g->parent_child->parent;
- }
- /* We can always add to old parent, becuase it has one
- * group already. */
+ /* We can always add to old parent, becuase it has a
+ * children property already. */
if (!add_child(old_parent, t))
abort();
return NULL;
static struct tal_hdr *first_child(struct tal_hdr *parent)
{
struct children *child;
- struct group *group;
child = find_property(parent, CHILDREN);
if (!child)
return NULL;
- /* Careful of empty group embedded in child property. */
- if (child->group.first_child)
- return child->group.first_child->next;
-
- /* There could still be another group! */
- group = next_group(&child->group);
- if (group == &child->group)
- return NULL;
-
- return group->first_child->next;
+ return list_top(&child->children, struct tal_hdr, list);
}
tal_t *tal_first(const tal_t *root)
tal_t *tal_next(const tal_t *root, const tal_t *prev)
{
struct tal_hdr *c, *t = debug_tal(to_tal_hdr(prev)), *top;
- struct group *group;
/* Children? */
c = first_child(t);
top = to_tal_hdr_or_null(root);
do {
- struct group *next;
+ struct tal_hdr *next;
+ struct list_node *end;
- /* Are we back to first child in group? */
- group = find_property(t, GROUP);
- if (!group)
- return from_tal_hdr(t->next);
+ end = &ignore_destroying_bit(t->parent_child)->children.n;
- /* Last group is one inside children property. */
- next = next_group(group);
- if (next != &group->parent_child->group)
- return from_tal_hdr(next->first_child->next);
+ next = list_entry(t->list.next, struct tal_hdr, list);
+ if (&next->list != end)
+ return from_tal_hdr(next);
/* OK, go back to parent. */
- t = group->parent_child->parent;
+ t = ignore_destroying_bit(t->parent_child)->parent;
} while (t != top);
return NULL;
tal_t *tal_parent(const tal_t *ctx)
{
- struct group *group;
struct tal_hdr *t;
if (!ctx)
return NULL;
t = debug_tal(to_tal_hdr(ctx));
-
- while (!(group = find_property(t, GROUP)))
- t = t->next;
-
- if (group->parent_child->parent == &null_parent.hdr)
+ if (ignore_destroying_bit(t->parent_child)->parent == &null_parent.hdr)
return NULL;
- return from_tal_hdr(group->parent_child->parent);
+ return from_tal_hdr(ignore_destroying_bit(t->parent_child)->parent);
}
bool tal_resize_(tal_t **ctxp, size_t size)
{
- struct tal_hdr *old_t, *t, **prev;
- struct group *group;
+ struct tal_hdr *old_t, *t;
struct children *child;
old_t = debug_tal(to_tal_hdr(*ctxp));
/* If it didn't move, we're done! */
if (t == old_t)
return true;
- update_bounds(t);
+ update_bounds(t, size + sizeof(struct tal_hdr));
- /* Fix up linked list pointer. */
- for (prev = &t->next; *prev != old_t; prev = &(*prev)->next);
- *prev = t;
+ /* Fix up linked list pointers. */
+ if (list_entry(t->list.next, struct tal_hdr, list) != old_t)
+ t->list.next->prev = t->list.prev->next = &t->list;
- /* Fix up group pointer, if any. */
- group = find_property(t, GROUP);
- if (group) {
- assert(group->first_child == old_t);
- group->first_child = t;
- }
-
- /* Fix up child propertie's parent pointer. */
+ /* Fix up child property's parent pointer. */
child = find_property(t, CHILDREN);
if (child) {
assert(child->parent == old_t);
printf(" ");
printf("%p", t);
for (p = t->prop; p; p = p->next) {
- struct group *g;
struct children *c;
struct destructor *d;
struct name *n;
switch (p->type) {
case CHILDREN:
c = (struct children *)p;
- printf(" CHILDREN(%p):parent=%p,group=%p\n",
- p, c->parent, &c->group);
- g = &c->group;
- printf(" GROUP(%p):list={%p,%p},parent_ch=%p,first=%p",
- g, g->list.n.next, g->list.n.next,
- g->parent_child, g->first_child);
- break;
- case GROUP:
- g = (struct group *)p;
- printf(" GROUP(%p):list={%p,%p},,parent_ch=%p,first=%p",
- p, g->list.n.next, g->list.n.next,
- g->parent_child, g->first_child);
+ printf(" CHILDREN(%p):parent=%p,children={%p,%p}\n",
+ p, c->parent,
+ c->children.n.prev, c->children.n.next);
break;
case DESTRUCTOR:
d = (struct destructor *)p;
static void tal_dump_(unsigned int level, const struct tal_hdr *t)
{
struct children *children;
- struct group *group;
dump_node(level, t);
children = find_property(t, CHILDREN);
- if (!children)
- return;
-
- group = &children->group;
- do {
+ if (children) {
struct tal_hdr *i;
- i = group->first_child;
- if (i) {
- do {
- tal_dump_(level+1, i);
- i = i->next;
- } while (i != group->first_child);
- }
- group = next_group(group);
- } while (group != &children->group);
+ list_for_each(&children->children, i, list)
+ tal_dump_(level + 1, i);
+ }
}
void tal_dump(void)
return false;
}
-static bool check_group(struct group *group,
- struct tal_hdr *t, const char *errorstr);
-
-static bool check_node(struct group *group,
+static bool check_node(struct children *parent_child,
struct tal_hdr *t, const char *errorstr)
{
struct prop_hdr *p;
struct name *name = NULL;
struct children *children = NULL;
- struct group *gr = NULL;
- if (t != &null_parent.hdr && !in_bounds(t))
+ if (!in_bounds(t))
return check_err(t, errorstr, "invalid pointer");
+ if (ignore_destroying_bit(t->parent_child) != parent_child)
+ return check_err(t, errorstr, "incorrect parent");
+
for (p = t->prop; p; p = p->next) {
if (is_literal(p)) {
if (name)
name = (struct name *)p;
break;
}
- if (p != &null_parent.c.hdr && p != &null_parent.c.group.hdr
- && !in_bounds(p))
+ if (!in_bounds(p))
return check_err(t, errorstr,
"has bad property pointer");
switch (p->type) {
- case GROUP:
- if (gr)
- return check_err(t, errorstr,
- "has two groups");
- gr = (struct group *)p;
- break;
case CHILDREN:
if (children)
return check_err(t, errorstr,
return check_err(t, errorstr, "has unknown property");
}
}
- if (group && gr != group)
- return check_err(t, errorstr, "has bad group");
-
if (children) {
- if (!list_check(&children->group.list, errorstr))
- return false;
- gr = &children->group;
- do {
- if (gr->first_child) {
- if (!check_group(gr, gr->first_child, errorstr))
- return false;
- } else if (gr != &children->group) {
- /* Empty groups should be deleted! */
- return check_err(t, errorstr,
- "has empty group");
- }
- gr = next_group(gr);
- } while (gr != &children->group);
- }
- return true;
-}
-
-static bool check_group(struct group *group,
- struct tal_hdr *t, const char *errorstr)
-{
- struct tal_hdr *i;
+ struct tal_hdr *i;
- i = t;
- do {
- if (!check_node(group, i, errorstr))
+ if (!list_check(&children->children, errorstr))
return false;
- group = NULL;
- i = i->next;
- } while (i != t);
+ list_for_each(&children->children, i, list) {
+ if (!check_node(children, i, errorstr))
+ return false;
+ }
+ }
return true;
}
{
struct tal_hdr *t = to_tal_hdr_or_null(ctx);
- return check_node(NULL, t, errorstr);
+ return check_node(ignore_destroying_bit(t->parent_child), t, errorstr);
}
#else /* NDEBUG */
bool tal_check(const tal_t *ctx, const char *errorstr)
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