server-skynet-source-3rd-je.../include/jemalloc/internal/rtree_inlines.h

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#ifndef JEMALLOC_INTERNAL_RTREE_INLINES_H
#define JEMALLOC_INTERNAL_RTREE_INLINES_H
#ifndef JEMALLOC_ENABLE_INLINE
unsigned rtree_start_level(const rtree_t *rtree, uintptr_t key);
unsigned rtree_ctx_start_level(const rtree_t *rtree,
const rtree_ctx_t *rtree_ctx, uintptr_t key);
uintptr_t rtree_subkey(rtree_t *rtree, uintptr_t key, unsigned level);
bool rtree_node_valid(rtree_elm_t *node);
rtree_elm_t *rtree_child_tryread(rtree_elm_t *elm, bool dependent);
rtree_elm_t *rtree_child_read(tsdn_t *tsdn, rtree_t *rtree, rtree_elm_t *elm,
unsigned level, bool dependent);
extent_t *rtree_elm_read(rtree_elm_t *elm, bool dependent);
void rtree_elm_write(rtree_elm_t *elm, const extent_t *extent);
rtree_elm_t *rtree_subtree_tryread(rtree_t *rtree, unsigned level,
bool dependent);
rtree_elm_t *rtree_subtree_read(tsdn_t *tsdn, rtree_t *rtree,
unsigned level, bool dependent);
rtree_elm_t *rtree_elm_lookup(tsdn_t *tsdn, rtree_t *rtree,
rtree_ctx_t *rtree_ctx, uintptr_t key, bool dependent, bool init_missing);
bool rtree_write(tsdn_t *tsdn, rtree_t *rtree, rtree_ctx_t *rtree_ctx,
uintptr_t key, const extent_t *extent);
extent_t *rtree_read(tsdn_t *tsdn, rtree_t *rtree,
rtree_ctx_t *rtree_ctx, uintptr_t key, bool dependent);
rtree_elm_t *rtree_elm_acquire(tsdn_t *tsdn, rtree_t *rtree,
rtree_ctx_t *rtree_ctx, uintptr_t key, bool dependent, bool init_missing);
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extent_t *rtree_elm_read_acquired(tsdn_t *tsdn, const rtree_t *rtree,
rtree_elm_t *elm);
void rtree_elm_write_acquired(tsdn_t *tsdn, const rtree_t *rtree,
rtree_elm_t *elm, const extent_t *extent);
void rtree_elm_release(tsdn_t *tsdn, const rtree_t *rtree, rtree_elm_t *elm);
void rtree_clear(tsdn_t *tsdn, rtree_t *rtree, rtree_ctx_t *rtree_ctx,
uintptr_t key);
#endif
#if (defined(JEMALLOC_ENABLE_INLINE) || defined(JEMALLOC_RTREE_C_))
JEMALLOC_ALWAYS_INLINE unsigned
rtree_start_level(const rtree_t *rtree, uintptr_t key)
{
unsigned start_level;
if (unlikely(key == 0))
return (rtree->height - 1);
start_level = rtree->start_level[(lg_floor(key) + 1) >>
LG_RTREE_BITS_PER_LEVEL];
assert(start_level < rtree->height);
return (start_level);
}
JEMALLOC_ALWAYS_INLINE unsigned
rtree_ctx_start_level(const rtree_t *rtree, const rtree_ctx_t *rtree_ctx,
uintptr_t key)
{
unsigned start_level;
uintptr_t key_diff;
/* Compute the difference between old and new lookup keys. */
key_diff = key ^ rtree_ctx->key;
assert(key_diff != 0); /* Handled in rtree_elm_lookup(). */
/*
* Compute the last traversal path element at which the keys' paths
* are the same.
*/
start_level = rtree->start_level[(lg_floor(key_diff) + 1) >>
LG_RTREE_BITS_PER_LEVEL];
assert(start_level < rtree->height);
return (start_level);
}
JEMALLOC_ALWAYS_INLINE uintptr_t
rtree_subkey(rtree_t *rtree, uintptr_t key, unsigned level)
{
return ((key >> ((ZU(1) << (LG_SIZEOF_PTR+3)) -
rtree->levels[level].cumbits)) & ((ZU(1) <<
rtree->levels[level].bits) - 1));
}
JEMALLOC_ALWAYS_INLINE bool
rtree_node_valid(rtree_elm_t *node)
{
return ((uintptr_t)node != (uintptr_t)0);
}
JEMALLOC_ALWAYS_INLINE rtree_elm_t *
rtree_child_tryread(rtree_elm_t *elm, bool dependent)
{
rtree_elm_t *child;
/* Double-checked read (first read may be stale). */
child = elm->child;
if (!dependent && !rtree_node_valid(child))
child = (rtree_elm_t *)atomic_read_p(&elm->pun);
assert(!dependent || child != NULL);
return (child);
}
JEMALLOC_ALWAYS_INLINE rtree_elm_t *
rtree_child_read(tsdn_t *tsdn, rtree_t *rtree, rtree_elm_t *elm, unsigned level,
bool dependent)
{
rtree_elm_t *child;
child = rtree_child_tryread(elm, dependent);
if (!dependent && unlikely(!rtree_node_valid(child)))
child = rtree_child_read_hard(tsdn, rtree, elm, level);
assert(!dependent || child != NULL);
return (child);
}
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JEMALLOC_ALWAYS_INLINE extent_t *
rtree_elm_read(rtree_elm_t *elm, bool dependent)
{
extent_t *extent;
if (dependent) {
/*
* Reading a value on behalf of a pointer to a valid allocation
* is guaranteed to be a clean read even without
* synchronization, because the rtree update became visible in
* memory before the pointer came into existence.
*/
extent = elm->extent;
} else {
/*
* An arbitrary read, e.g. on behalf of ivsalloc(), may not be
* dependent on a previous rtree write, which means a stale read
* could result if synchronization were omitted here.
*/
extent = (extent_t *)atomic_read_p(&elm->pun);
}
/* Mask the lock bit. */
extent = (extent_t *)((uintptr_t)extent & ~((uintptr_t)0x1));
return (extent);
}
JEMALLOC_INLINE void
rtree_elm_write(rtree_elm_t *elm, const extent_t *extent)
{
atomic_write_p(&elm->pun, extent);
}
JEMALLOC_ALWAYS_INLINE rtree_elm_t *
rtree_subtree_tryread(rtree_t *rtree, unsigned level, bool dependent)
{
rtree_elm_t *subtree;
/* Double-checked read (first read may be stale). */
subtree = rtree->levels[level].subtree;
if (!dependent && unlikely(!rtree_node_valid(subtree))) {
subtree = (rtree_elm_t *)atomic_read_p(
&rtree->levels[level].subtree_pun);
}
assert(!dependent || subtree != NULL);
return (subtree);
}
JEMALLOC_ALWAYS_INLINE rtree_elm_t *
rtree_subtree_read(tsdn_t *tsdn, rtree_t *rtree, unsigned level, bool dependent)
{
rtree_elm_t *subtree;
subtree = rtree_subtree_tryread(rtree, level, dependent);
if (!dependent && unlikely(!rtree_node_valid(subtree)))
subtree = rtree_subtree_read_hard(tsdn, rtree, level);
assert(!dependent || subtree != NULL);
return (subtree);
}
JEMALLOC_ALWAYS_INLINE rtree_elm_t *
rtree_elm_lookup(tsdn_t *tsdn, rtree_t *rtree, rtree_ctx_t *rtree_ctx,
uintptr_t key, bool dependent, bool init_missing)
{
uintptr_t subkey;
unsigned start_level;
rtree_elm_t *node;
assert(!dependent || !init_missing);
if (dependent || init_missing) {
if (likely(rtree_ctx->valid)) {
if (key == rtree_ctx->key)
return (rtree_ctx->elms[rtree->height]);
else {
unsigned no_ctx_start_level =
rtree_start_level(rtree, key);
unsigned ctx_start_level;
if (likely(no_ctx_start_level <=
rtree_ctx->start_level && (ctx_start_level =
rtree_ctx_start_level(rtree, rtree_ctx,
key)) >= rtree_ctx->start_level)) {
start_level = ctx_start_level;
node = rtree_ctx->elms[ctx_start_level];
} else {
start_level = no_ctx_start_level;
node = init_missing ?
rtree_subtree_read(tsdn, rtree,
no_ctx_start_level, dependent) :
rtree_subtree_tryread(rtree,
no_ctx_start_level, dependent);
rtree_ctx->start_level =
no_ctx_start_level;
rtree_ctx->elms[no_ctx_start_level] =
node;
}
}
} else {
unsigned no_ctx_start_level = rtree_start_level(rtree,
key);
start_level = no_ctx_start_level;
node = init_missing ? rtree_subtree_read(tsdn, rtree,
no_ctx_start_level, dependent) :
rtree_subtree_tryread(rtree, no_ctx_start_level,
dependent);
rtree_ctx->valid = true;
rtree_ctx->start_level = no_ctx_start_level;
rtree_ctx->elms[no_ctx_start_level] = node;
}
rtree_ctx->key = key;
} else {
start_level = rtree_start_level(rtree, key);
node = init_missing ? rtree_subtree_read(tsdn, rtree,
start_level, dependent) : rtree_subtree_tryread(rtree,
start_level, dependent);
}
#define RTREE_GET_BIAS (RTREE_HEIGHT_MAX - rtree->height)
switch (start_level + RTREE_GET_BIAS) {
#define RTREE_GET_SUBTREE(level) \
case level: \
assert(level < (RTREE_HEIGHT_MAX-1)); \
if (!dependent && unlikely(!rtree_node_valid(node))) { \
if (init_missing) \
rtree_ctx->valid = false; \
return (NULL); \
} \
subkey = rtree_subkey(rtree, key, level - \
RTREE_GET_BIAS); \
node = init_missing ? rtree_child_read(tsdn, rtree, \
&node[subkey], level - RTREE_GET_BIAS, dependent) : \
rtree_child_tryread(&node[subkey], dependent); \
if (dependent || init_missing) { \
rtree_ctx->elms[level - RTREE_GET_BIAS + 1] = \
node; \
} \
/* Fall through. */
#define RTREE_GET_LEAF(level) \
case level: \
assert(level == (RTREE_HEIGHT_MAX-1)); \
if (!dependent && unlikely(!rtree_node_valid(node))) { \
if (init_missing) \
rtree_ctx->valid = false; \
return (NULL); \
} \
subkey = rtree_subkey(rtree, key, level - \
RTREE_GET_BIAS); \
/* \
* node is a leaf, so it contains values rather than \
* child pointers. \
*/ \
node = &node[subkey]; \
if (dependent || init_missing) { \
rtree_ctx->elms[level - RTREE_GET_BIAS + 1] = \
node; \
} \
return (node);
#if RTREE_HEIGHT_MAX > 1
RTREE_GET_SUBTREE(0)
#endif
#if RTREE_HEIGHT_MAX > 2
RTREE_GET_SUBTREE(1)
#endif
#if RTREE_HEIGHT_MAX > 3
RTREE_GET_SUBTREE(2)
#endif
#if RTREE_HEIGHT_MAX > 4
RTREE_GET_SUBTREE(3)
#endif
#if RTREE_HEIGHT_MAX > 5
RTREE_GET_SUBTREE(4)
#endif
#if RTREE_HEIGHT_MAX > 6
RTREE_GET_SUBTREE(5)
#endif
#if RTREE_HEIGHT_MAX > 7
RTREE_GET_SUBTREE(6)
#endif
#if RTREE_HEIGHT_MAX > 8
RTREE_GET_SUBTREE(7)
#endif
#if RTREE_HEIGHT_MAX > 9
RTREE_GET_SUBTREE(8)
#endif
#if RTREE_HEIGHT_MAX > 10
RTREE_GET_SUBTREE(9)
#endif
#if RTREE_HEIGHT_MAX > 11
RTREE_GET_SUBTREE(10)
#endif
#if RTREE_HEIGHT_MAX > 12
RTREE_GET_SUBTREE(11)
#endif
#if RTREE_HEIGHT_MAX > 13
RTREE_GET_SUBTREE(12)
#endif
#if RTREE_HEIGHT_MAX > 14
RTREE_GET_SUBTREE(13)
#endif
#if RTREE_HEIGHT_MAX > 15
RTREE_GET_SUBTREE(14)
#endif
#if RTREE_HEIGHT_MAX > 16
# error Unsupported RTREE_HEIGHT_MAX
#endif
RTREE_GET_LEAF(RTREE_HEIGHT_MAX-1)
#undef RTREE_GET_SUBTREE
#undef RTREE_GET_LEAF
default: not_reached();
}
#undef RTREE_GET_BIAS
not_reached();
}
JEMALLOC_INLINE bool
rtree_write(tsdn_t *tsdn, rtree_t *rtree, rtree_ctx_t *rtree_ctx, uintptr_t key,
const extent_t *extent)
{
rtree_elm_t *elm;
assert(extent != NULL); /* Use rtree_clear() for this case. */
assert(((uintptr_t)extent & (uintptr_t)0x1) == (uintptr_t)0x0);
elm = rtree_elm_lookup(tsdn, rtree, rtree_ctx, key, false, true);
if (elm == NULL)
return (true);
assert(rtree_elm_read(elm, false) == NULL);
rtree_elm_write(elm, extent);
return (false);
}
JEMALLOC_ALWAYS_INLINE extent_t *
rtree_read(tsdn_t *tsdn, rtree_t *rtree, rtree_ctx_t *rtree_ctx, uintptr_t key,
bool dependent)
{
rtree_elm_t *elm;
elm = rtree_elm_lookup(tsdn, rtree, rtree_ctx, key, dependent, false);
if (elm == NULL)
return (NULL);
return (rtree_elm_read(elm, dependent));
}
JEMALLOC_INLINE rtree_elm_t *
rtree_elm_acquire(tsdn_t *tsdn, rtree_t *rtree, rtree_ctx_t *rtree_ctx,
uintptr_t key, bool dependent, bool init_missing)
{
rtree_elm_t *elm;
elm = rtree_elm_lookup(tsdn, rtree, rtree_ctx, key, dependent,
init_missing);
if (!dependent && elm == NULL)
return (NULL);
{
extent_t *extent;
void *s;
do {
extent = rtree_elm_read(elm, false);
/* The least significant bit serves as a lock. */
s = (void *)((uintptr_t)extent | (uintptr_t)0x1);
} while (atomic_cas_p(&elm->pun, (void *)extent, s));
}
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if (config_debug)
rtree_elm_witness_acquire(tsdn, rtree, key, elm);
return (elm);
}
JEMALLOC_INLINE extent_t *
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rtree_elm_read_acquired(tsdn_t *tsdn, const rtree_t *rtree, rtree_elm_t *elm)
{
extent_t *extent;
assert(((uintptr_t)elm->pun & (uintptr_t)0x1) == (uintptr_t)0x1);
extent = (extent_t *)((uintptr_t)elm->pun & ~((uintptr_t)0x1));
assert(((uintptr_t)extent & (uintptr_t)0x1) == (uintptr_t)0x0);
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if (config_debug)
rtree_elm_witness_access(tsdn, rtree, elm);
return (extent);
}
JEMALLOC_INLINE void
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rtree_elm_write_acquired(tsdn_t *tsdn, const rtree_t *rtree, rtree_elm_t *elm,
const extent_t *extent)
{
assert(((uintptr_t)extent & (uintptr_t)0x1) == (uintptr_t)0x0);
assert(((uintptr_t)elm->pun & (uintptr_t)0x1) == (uintptr_t)0x1);
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if (config_debug)
rtree_elm_witness_access(tsdn, rtree, elm);
elm->pun = (void *)((uintptr_t)extent | (uintptr_t)0x1);
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assert(rtree_elm_read_acquired(tsdn, rtree, elm) == extent);
}
JEMALLOC_INLINE void
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rtree_elm_release(tsdn_t *tsdn, const rtree_t *rtree, rtree_elm_t *elm)
{
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rtree_elm_write(elm, rtree_elm_read_acquired(tsdn, rtree, elm));
if (config_debug)
rtree_elm_witness_release(tsdn, rtree, elm);
}
JEMALLOC_INLINE void
rtree_clear(tsdn_t *tsdn, rtree_t *rtree, rtree_ctx_t *rtree_ctx, uintptr_t key)
{
rtree_elm_t *elm;
elm = rtree_elm_acquire(tsdn, rtree, rtree_ctx, key, true, false);
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rtree_elm_write_acquired(tsdn, rtree, elm, NULL);
rtree_elm_release(tsdn, rtree, elm);
}
#endif
#endif /* JEMALLOC_INTERNAL_RTREE_INLINES_H */